BEGIN:VCALENDAR PRODID:-//Google Inc//Google Calendar 70.9054//EN VERSION:2.0 CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Department of Physics Calendar X-WR-TIMEZONE:America/New_York X-WR-CALDESC:Physics Calendar Events for Seminars\, Colloquium\, Special Ev ents and Programs BEGIN:VTIMEZONE TZID:America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART:20140911T180000Z DTEND:20140911T193000Z DTSTAMP:20260828T094430Z UID:hni1ddi7lff0894vv9ht6ctl54@google.com CREATED:20140828T211639Z DESCRIPTION:Speaker Name: Dr. Tyrel McQueen\n\nSpeaker Institution: Johns Hopkins\n\nTitle: Surface states and topology in Kondo insulating SmB6 an d superconducting Tl5Te3\n\nAbstract: The discovery of three dimensional to pological insulators in compounds such as Bi1-xSbx and Bi2Se3 has opened a new field in condensed matter physics. Recent interest has shifted to topol ogical materials in which there are other strong interactions\, e.g. electr on-electron correlations or superconductivity. In this talk\, I will presen t our recent results on the SmB6\, including a dependence of the low-temper ature resistivity plateau on doping chemistry and inelastic neutron scatter ing that provide strong support that SmB6 is in fact a correlated topologic al insulator. I will also show that there are Dirac-like surface states in the superconductor Tl5Te3.\n\nReferences\n1.W.A. Phelan\, et al. Phys. Rev. X 4\, 031012 (2014)\n2.W.T. Fuhrman\, et al. arXiv:1407.2647 (2014)\n3.K.E . Arpino\, et al. Phys. Rev. Lett. 112\, 017002 (2014)\n\n\n\nJoin with Goo gle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/msutto n2?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLm NvbQ.hni1ddi7lff0894vv9ht6ctl54&hs=121 LAST-MODIFIED:20140904T200604Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150313T160000Z DTEND:20150313T163000Z DTSTAMP:20260828T094430Z UID:7iok6bc1qe7plq5vt07cngir18@google.com CLASS:PUBLIC CREATED:20150309T143145Z DESCRIPTION:Speaker Name: Jianxin Chen\n\nSpeaker Institution: QuICS\n\nTit le: Principle of Maximum Entropy and Quantum Phase Transitions\n \nAbstract : We discuss quantum phase transitions from an information-theoretic point of view\, based on the information from local observable measurements. Two types of transitions naturally arise from our approach\, for smooth change s of local Hamiltonians. One type can be detected by a non-smooth change of local observable measurements while the other type cannot. The discontinui ty of the maximum entropy inference for local observable measurements signa ls the non-local type of transitions\, indicating the existence of long-ran ge irreducible many-body correlations. As commonly recognized\, the topolog ical phase transitions are non-local where the maximum entropy inference ar e indeed discontinuous at the transition points. We clarify that\, however\ , the ‘symmetry-breaking’ phase transitions\, for instance the one in the t ransverse Ising model\, are also non-local with discontinuity of the maximu m entropy inference. We propose to detect the non-local type of transitions by the quantum conditional mutual information of two disconnect parts of t he system. The local/non-local types have intimate relationships with the f irst-order/continuous types of quantum phase transitions. \n\n(Free lunch s erved right before the talk) LAST-MODIFIED:20150312T142635Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150804T150000Z DTEND:20150804T160000Z DTSTAMP:20260828T094430Z UID:kosvje9fims7e5kikeiip0grqc@google.com CLASS:PUBLIC CREATED:20150730T135307Z DESCRIPTION:Speaker: Arno Rauschenbeutel\n\nInstitution: Vienna Center for Quantum Science and Technology\,Institute of Atomic and Subatomic Physics\, Vienna University of Technology\, Wien\, Austria\n\nAbstract: When light is strongly transversally confined\, significant local polarization component sthat pointin the direction of propagation arise. In contrast to paraxial l ight fields\, the corresponding intrinsic angular momentum of the light fie ld is position-dependent -an effect referred to as spin-orbit interaction o f light. Remarkably\, the light’s spin can even be perpendicular to the pro pagation direction. The interaction of emitters with such light fields lead s to new and surprising effects. For example\, when coupling gold nanoparti cles oratomsto the evanescent field surrounding a silica nanophotonic waveg uide\, the intrinsic mirror symmetry of the particles’ emission is broken. This allowed us to realize chiral nanophotonic interfaces in which the emis sion direction of light into the waveguide is controlled by the polarizatio n of the excitation light [1] or by the internal state of the atoms [2]\, r espectively.Moreover\, we employ thischiral interactionto demonstrate nonre ciprocal transmission of light at the single-photon level through a silica nanofiber[3].\n\nReferences[1]J. Petersen et al.\, Science 346\, 67 (2014). [2]R. Mitsch et al.\, Nature Commun. 5\, 5713(2014).[3]C. Sayrinet al.\, ar Xiv:arXiv:1502.01549 (2015). LAST-MODIFIED:20150730T135307Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150430T163000Z DTEND:20150430T173000Z DTSTAMP:20260828T094430Z UID:nmpt8r4bdm5p83pa7iqlu1497k@google.com CREATED:20150414T185130Z DESCRIPTION:Speaker Name: Klimka Szwaykowska\n\nSpeaker Institution :Naval Research Labatory\, Washington\, D.C.\n\nTitle: Effect of heterogeneous dy namics and structured communication on collective motion of delay-coupled s warms\n\n\n LAST-MODIFIED:20150422T203015Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160310T190000Z DTEND:20160310T203000Z DTSTAMP:20260828T094430Z UID:2p77curvjv5ce95hjbmfolce8g@google.com CREATED:20160131T203653Z DESCRIPTION:Speaker Name: Keji Lai\n\nSpeaker Institution: UT\, Austin\n\ nTitle: Microwave Impedance Microscopy on Electrostatically Modulated Quant um Materials\n\nAbstract: Field-effect transistors (FETs) are the backbone of modern semiconductor devices. The same concept of electrostatic modulat ion of carrier densities has also been very fruitful for the exploration of electronic properties in advanced quantum materials. Using a non-invasive microwave impedance microscope with ~100nm resolution and ~1nS sensitivity\ , we have visualized the metal-insulator transitions of various materials i n the FET configuration. The images acquired at different gate voltages of MoS2 and HgTe devices clearly show the spatial evolution of conductance at the edge and bulk of the sample. Using a thin layer of ion gel as the gate dielectric\, we have also demonstrated the real-space conductance mapping i n ZnO electric double-layer transistors (EDLTs). The uneven conductance pro file due to a large source-drain bias can be probed by the microscope and f urther investigated by transport measurements and numerical simulations. Th e combination of novel FETs and impedance microscopy paves the way to study phase transitions in complex materials induced by electrostatic field effe cts.\n\nHOST: James Williams\n LAST-MODIFIED:20160308T193428Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Keji Lai\, UT\, Austin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120906T180000Z DTEND:20120906T193000Z DTSTAMP:20260828T094430Z UID:0jseadvocg58sk7ka26lc4ii3s@google.com CREATED:20120904T162647Z DESCRIPTION:Condensed Matter Colloquium\n\nSpeaker: Sankar Das Sarma\, Univ ersity of Maryland\, Condensed Matter Theory Center\n\nTitle/Abstract: Has the elusive Majorana particle been experimentally observed in semiconducto r/superconductor heterostructures? LAST-MODIFIED:20120904T173347Z LOCATION:Rm 1201\, John S Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150207T000000Z DTEND:20150207T013000Z DTSTAMP:20260828T094430Z UID:lenrir9t2pbe4o5kd085hgi6ng@google.com CREATED:20150206T171846Z DESCRIPTION:Geared towards a high school level audience\, these shows educa te and entertain the public through the use of both interactive and faculty -led demonstrations. For further information about the program and directio ns to the Physics Building\, visit http://lecdem.physics.umd.edu/index.ph p/outreach/physics-is-phun LAST-MODIFIED:20150206T171922Z LOCATION:1412/1410 Lecture Halls\, John S. Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151207T210000Z DTEND:20151207T220000Z DTSTAMP:20260828T094430Z UID:do21v9hhidncqoaj59up0v20ng@google.com CREATED:20151130T215536Z DESCRIPTION:Speaker Name: Ivet Bahar\n\nSpeaker Institution : University of Pittsburgh\n\nTitle : Structural Dynamics of Dopamine Transporters and Com parison with LeuT Dynamics\n\nAbstract : Dopaminergic signaling in the cent ral nervous system is regulated by the human dopamine (DA) transporter (hDA T) molecules. DAT maintains the synaptic concentration of DA at physiologic al levels\, upon reuptake of DA into presynaptic terminals thus preventing the saturation or desensitization of dopamine receptors. DA translocation i nvolves the co-transport of two sodium ions and the channeling of a chlorid e ion\, and it is achieved via alternating access between outward-facing an d inward-facing states of DAT. hDAT is a target for addictive drugs\, such as cocaine\, amphetamine (AMPH)\, and therapeutic antidepressants. However\ , the molecular mechanism of dopamine transport and its modulation by psych ostimulants remain elusive. The newly resolved DAT structure from Drosophil a melanogaster recently opened the way to a deeper understanding of the mec hanism and time evolution of DAT function. Simulations also demonstrated th at binding DA or AMPH drives a structural transit! ion toward a functional form predisposed to translocate the ligand. I will present recent progress in this topic obtained with a combination of computational models and metho ds that now provide deeper insights into the complex mechanism of hDAT func tion\, and the role of intermolecular interactions in the regulation of dop aminergic signaling. LAST-MODIFIED:20151201T155347Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150130T210000Z DTEND:20150130T223000Z DTSTAMP:20260828T094430Z UID:e47b3orbool1r1p3q90gv0o8g4@google.com CREATED:20150105T141340Z DESCRIPTION:**This seminar was originally scheduled for Monday but was post poned due to inclement weather**\n\nSpeaker Name: Michael Buchoff\n\nSpeake r Institution: University of Washington\n\nTitle: Neutron-antineutron trans itions and the lattice\n\nAbstract: In the everyday exploration of our matt er filled universe\, one scenario that rarely crosses our mind is the possi bility of matter suddenly\ntransitioning to antimatter. While this idea se ems somewhat far-fetched\, there is ample collider evidence that this occur s in mesonic physics such as kaon-mixing and B-mixing\; both instances indi cative of the weak interaction. One intriguing instance that hits closer to the low-energy world we see everyday is the possibility that a neutron c an transition to an antineutron via some beyond-the-Standard-Model (BSM) in teraction that changes baryon number by two units. Obviously\, this transi tion cannot occur too frequently (none of us would exist)\, but any indicat ion of this process would not only imply new physics\, but address the monu mental question of what early universe process enabled the baryon-antibaryo n asymmetry that we see today. Even if a signal is not observed\, very ti ght constraints can be put on large classes of theoretical models by boundi ng the transition rate. However\, to make a reliable prediction/interpretat ion of this transition rate\, the dimension-six neutron-antineutron matrix elements must be calculated from first principles via lattice QCD. In this colloquium\, I will review the promising experimental prospects along with the potential theoretical implications\, and I will present preliminary re sults of the lattice QCD calculations that are necessary to understand thes e implications.\n\nJoin with Google Hangouts: https://hangouts.google.com/h angouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ 1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.e47b3orbool1r1p3q90gv0o8g4&hs=121 LAST-MODIFIED:20150126T181320Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar - New Date TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141027T200000Z DTEND:20141027T210000Z DTSTAMP:20260828T094430Z UID:o2ruo4k1d27f0rlp9frlr0padk@google.com CREATED:20141009T151107Z DESCRIPTION:Speaker Name: Valeri Barsegov\n\nSpeaker Institution : Barsegov \n\nTitle: Fluctuating nonlinear spring model of mechanical deformation of biological particles\n\nAbstract : We present a new theory for modeling sp ectral lineshapes available from single-particle forced indentation experim ents. The theory considers weakly non-linear Hertzian deformation due to a physical contact between the indenter and the biological particle\, and ben ding deformations of other portions of the particle structure modeled as ‘v ertical beams’. The bending of beams beyond the critical point sets in the particle dynamic transition to the collapsed state\, an extreme event leadi ng to the catastrophic force drop as observed in the force (F)-deformation (X) spectra (FX curves). \nThe theory interprets fine features of the spect ra\, i.e. the slope of the FX curves and the force-peak signal\, in terms o f mechanical characteristics such as the Young’s moduli for Hertzian and be nding deformations\, and the Weibull probability distribution of the maximu m strength with the scale parameter and shape parameter. The theory is appl ied to model the FX curves for several spherically shaped virus particles – CCMV\, TrV\, and AdV.\n\n\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/lbk660a75b8jh7e?hceid=bGJrNjYwYTc1Yjhq aDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.o2ruo4k1d27f0rlp9frl r0padk&hs=121 LAST-MODIFIED:20141009T151142Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150402T180000Z DTEND:20150402T190000Z DTSTAMP:20260828T094430Z UID:7nnnifcu6buqatodbcn04l0g0o@google.com CLASS:PUBLIC CREATED:20150327T144547Z DESCRIPTION:Speaker: Alexander D. Cronin\, University of Arizona\n\nTitle: Atom interferometer gyroscope with spin-dependent phase shifts induced by l ight near a tune-out wavelength\n \nAbstract: Tune-out wavelengths measured with an atom interferometer are sensitive to laboratory rotation rates bec ause of the Sagnac effect\, vector polarizability\, and dispersion compensa tion. We observed shifts in measured tune-out wavelengths as large as 213 p m with a potassium atom beam interferometer\, and we explore how these shif ts can be used for an atom interferometer gyroscope. For further informatio n\, see http://j.mp/TUNEOUT LAST-MODIFIED:20150327T144547Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151026T170000Z DTEND:20151026T180000Z DTSTAMP:20260828T094430Z UID:s8frvspgb004ik84gmfk393bc0@google.com CREATED:20151022T184023Z DESCRIPTION:Speaker Name: Stephen Piddock\n\nSpeaker Institution: Universit y of Bristol\n\nTitle: The complexity of antiferromagnetic qubit interactio ns and 2D lattices\n\nAbstract: Estimation of the minimum eigenvalue of a q uantum Hamiltonian can be formalised as the Local Hamiltonian problem. In o ne natural special case of the Local Hamiltonian problem\, the same 2-local interaction\, with differing weights\, is applied across each pair of qubi ts. I will talk about some recent work classifying the computational comple xity of this problem when some additional physically motivated restrictions are made to these weights. In particular we consider the case where these weights are all positive and/or that the interactions are restricted to the edges of a 2D square (or triangular) lattice. For most interactions we are able to classify the complexity as either QMA -complete or contained in St oqMA. For more details\, the full paper can be found here: http://arxiv.org /abs/1506.04014 LAST-MODIFIED:20151022T184315Z LOCATION:CSS 3100A SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20151210T190000Z DTEND:20151210T200000Z DTSTAMP:20260828T094430Z UID:6kt4jrv4mbiigcuf3nn4fktntg@google.com CREATED:20151105T225506Z DESCRIPTION:SPEAKER: Inna Vishik\, MIT\n\nTITLE: Ultrafast dynamics in he avy fermions and electron doped cuprates\n\nABSTRACT: Ultrafast spectrosop ies have emerged as important tools for studying quantum materials\, and on e of the key capabilities of ultrafast techniques is identifying relaxation processes in the time domain which are relevant to the formation of exotic states such as high temperature superconductivity. I will present ultrafa st pump-probe spectroscopy studies of the heavy fermion superconductor CeCo In5 and the electron-doped cuprate La2-xCexCuO4 (LCCO). In these experiment s\, a 70-femtosecond 800nm-wavelength pulse creates transient electronic ex citations whose decay is probed by studying changes in reflectivity as a fu nction of time. Both materials exhibit characteristic changes in pump-prob e relaxation dynamics across the key temperatures in the phase diagram—the Kondo coherence temperature in CeCoIn5 and Tc and TN in LCCO. In both mate rial systems\, the low temperature state contains two components—heavy/ligh t electrons in CeCoIn5 and superconductivity/antiferromagnetism in LCCO—whi ch can be distinguished via their unique time-domain signatures. \n\nHOST: Johnpierre Paglione LAST-MODIFIED:20151204T020422Z LOCATION:Room 1201 John S Toll Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Inna Vishik\, MIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160310T173000Z DTEND:20160310T183000Z DTSTAMP:20260828T094430Z UID:rruo0vmbcipq2745vf55f4c05k@google.com CREATED:20160129T154230Z DESCRIPTION:Speaker: Itamar Shani\n\nSpeaker Institution: UMD\n\nTitle: The three-body problem dominates dynamics of long-range interacting microfluid ic droplet ensembles\n\n LAST-MODIFIED:20160307T160935Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Changed! Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141002T163000Z DTEND:20141002T173000Z DTSTAMP:20260828T094430Z UID:oc7abnjofq32m9cdsphpc4oh50@google.com CREATED:20140911T182048Z DESCRIPTION:Speaker Name: Juan Restrepo\n\nSpeaker Institution : University of Colorado\, Department of Applied Mathematics\n\nTitle: Inhibition guara ntees ceaseless cortex dynamics\n\n\nJoin with Google Hangouts: https://han gouts.google.com/hangouts/_/physics.umd.edu/applied-physics?hceid=bGJrNjYwY Tc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.oc7abnjofq32m 9cdsphpc4oh50&hs=121 LAST-MODIFIED:20140917T204749Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130228T183000Z DTEND:20130228T193000Z DTSTAMP:20260828T094430Z UID:e8om4151ojj31rqdlr038oimf8@google.com CREATED:20130206T220529Z LAST-MODIFIED:20130218T221151Z LOCATION:Physics Rm 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20140428 DTEND;VALUE=DATE:20140429 DTSTAMP:20260828T094430Z UID:j7kdbsdninfkm6tqdhh9mm4i38@google.com CREATED:20140325T182807Z LAST-MODIFIED:20140325T182807Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics - No Seminar Held Today TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150916T150000Z DTEND:20150916T163000Z DTSTAMP:20260828T094430Z UID:5net9tcj5ss3nj5copse8p2is0@google.com CREATED:20150817T114225Z DESCRIPTION:Speaker: Andrea Shindler\n\nSpeaker Affiliation: Julich \n\nTit le: Beyond the Standard model matrix elements with the gradient flow:\nthe case of the nucleon electric dipole moment\n\nAbstract: The Standard Model of Particle Physics alone is not\nsufficient to explain certain phenomena o bserved\nin our Universe that have profound consequences to life as we know it\,\nsuch as the matter-antimatter asymmetry and the existence of Dark Ma tter and Dark Energy.\nAn understanding of these phenomena requires physics beyond the Standard Model (BSM)\,\nwith experimental signatures that are m ost likely small and masked by strong\ninteraction physics within the Stand ard Model (i.e. Quantum Chromodynamics (QCD)).\nTherefore future precision terrestrial measurements of any BSM observable\nwill require an equally pre cise understanding of its strong interaction QCD component.\nTo calculate t he QCD component of key BSM matrix elements related to quark and strong\nth eta-CP violations we propose to use the gradient flow within the lattice QC D framework.\nA similar numerical and theoretical scheme can be used to com pute the strange content of the nucleon.\nI will outline the strategy for s uch computations and present some selected results. LAST-MODIFIED:20150908T131210Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140310T163000Z DTEND:20140310T183000Z DTSTAMP:20260828T094430Z UID:gnah75pr5tc701p4jk84vfev9k@google.com CREATED:20140305T170502Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12.30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: Probing the 1000 TeV Energy Scale: Searches for Muon and Elec tron Number Violation at Unprecedented Sensitivity \n\nSpeaker: William Mol zon\, UC Irvine \n\nAbstract: Violation of electron\, muon\, and tau lepton numbers in the charged sector [CLFV] is an unambiguous signature of new ph ysical processes\; the Standard Model\, modified to include neutrino mass a nd mixing\, predicts rates for CLFV processes at an immeasurably low rate. In contrast\, many models for new physics allow CLFV\, and even current lim its severely constrain various models’ parameter space. Current and planned advances in muon beam intensities and e+e- collider luminosities\, coupled with new detectors with improved rate capabilities and resolutions\, provi de prospects for much improved experimental sensitivity. I will briefly rev iew the current experimental status and models that predict CLFV and then d iscuss results from ongoing experiments and prospects for new experiments t hat will improve on earlier results\, concentrating on muon induced process es: μ+→e+γ\, μ+→e+e+e-\, and μ-N→e-N. LAST-MODIFIED:20140305T170502Z LOCATION:Bloomberg Hall\, John's Hopkins University SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Joint Seminar w/ Johns Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140523T180000Z DTEND:20140523T190000Z DTSTAMP:20260828T094430Z UID:50d4lgkfc7vn8bo37kish0eu9s@google.com CREATED:20140520T144716Z DESCRIPTION:Speaker Name: Philipp Hauke\n\nSpeaker Institution: University of Innsbruck\n\nTitle: Many-body localization and ergodicity in disordered long-range Ising models\n\nAbstract: Although a quantum version of the clas sical ergodic theorem has been put forward already by von Neumann in 1929\, a general understanding of quantum ergodicity has not yet been achieved. R ecently\, it has been proposed that a general framework for quantum ergodic ity could be given by the concept of many-body localization. Since in a man y-body localized phase all eigenfunctions are localized\, such phases may b e inherently robust against local errors and could be useful in the context of quantum memory devices. However\, compared to single-particle localizat ion\, many-body localization suffers from an increased complexity\, making it challenging to derive the localization properties of a given system an d finding suitable\, experimentally accessible quantities for their charact erization.\nIn this talk\, we present recent analytical and numerical resul ts for a quantum many-body system that can be realized in state-of-the-art trapped-ion experiments\, a long-range Ising models with disorder in the tr ansverse-field. As we show\, this model enters a many-body localized phase at any non-vanishing disorder strength. We discuss how this model can be im plemented in current experiments\, and we identify a general measure for qu antum ergodicity that can be obtained through experimentally accessible\, s ingle-particle observables. \n\nHost: Chris Monroe\n\nJoin with Google Hang outs: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-special?hc eid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ. 50d4lgkfc7vn8bo37kish0eu9s&hs=121 LAST-MODIFIED:20140520T144945Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150527T150000Z DTEND:20150527T160000Z DTSTAMP:20260828T094430Z UID:i7bniidoehlv0c3kfpgi8lgpg0@google.com CREATED:20150507T133156Z DESCRIPTION:Speaker Name: Bill Fefferman \n\nSpeaker Institution: Maryland\ n\nTitle: Quantum complexity and circuit obfuscation\n\nAbstract: How power ful are quantum computers? Despite the prevailing belief that quantum compu ters are more powerful than their classical counterparts\, this remains a c onjecture backed by little formal evidence. Shor's algorithm\, for instance \, gives an example of a problem (factoring)\, which can be solved efficien tly on a quantum computer with no known efficient classical algorithm. Fact oring however\, is unlikely to be NP-hard\, meaning that few unexpected for mal consequences would arise\, should such a classical algorithm be discove red. Could it then be the case that any quantum algorithm can be simulated efficiently classically? Likewise\, could it be the case that quantum compu ters can quickly solve problems much harder than factoring? In particular\, what classical computational resources do we need to solve the hardest pro blem that has an efficient quantum algorithm? In this seminar\, we address these questions and give an overview of recent research proving that quantu m computers can sample from distributions that cannot be sampled efficientl y by classical computers. We further utilize these results to discuss the f easibility of quantum circuit obfuscation-- a powerful primitive with many applications to cryptography. We show that some of the most desirable varia nts of quantum obfuscation procedures are impossible to achieve. Despite th is\, there are other variants that are not able to prove impossible\, and e ven constructions of candidate quantum circuit obfuscators. We survey these results\, and give new\, quantum applications of these more limited obfusc ators. (Based on joint work with Chris Umans (Caltech) and Gorjan Alagic (C openhagen).)\n LAST-MODIFIED:20150519T204756Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160420T150000Z DTEND:20160420T160000Z DTSTAMP:20260828T094430Z UID:5inpgieur6gj4lhq79ickc814k@google.com CREATED:20160328T133208Z DESCRIPTION:Speaker: Troy Lee\n\nSpeaker Affiliation: Centre for Quantum Te chnologies\, Singapore\n\nTitle: New separations in query complexity\n\nAbs tract: For partial boolean functions\, whose domain can be a subset of {0\, 1}^n\, exponential separations are known between the number of queries a cl assical deterministic algorithm needs to compute a function and the number of queries a quantum algorithm needs. For a total boolean function f\, who se domain is all of {0\,1}^n\, the situation is quite different: the quantu m Q(f) and deterministic D(f) query complexities are always polynomially re lated\, in fact D(f) = O(Q(f)^6). It was widely believed this relation was far from tight\, as for 20 years the largest separation known between thes e two measures has been quadratic\, witnessed by Grover's search algorithm. We exhibit a total boolean function with a 4th power separation between i ts quantum and deterministic query complexities. Interestingly\, no new qu antum algorithms are needed to achieve this separation---our quantum algori thm is based on Grover search and amplitude amplification.\n\nThis is joint work with Andris Ambainis\, Kaspars Balodis\, Aleksandrs Belovs\, Miklos S antha\, and Juris Smotrovs. LAST-MODIFIED:20160328T133208Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150324T171500Z DTEND:20150324T183000Z DTSTAMP:20260828T094430Z UID:lu3fqr9q79idu65s5lapqo8m28@google.com CREATED:20150309T152836Z DESCRIPTION:Speaker Name: Nicole Yunger Halpern\n\nSpeaker Institution : Ca ltech\n\nTitle : (One-Shot) Information Theory and Statistical Mechanics\n\ nAbstract : The growing field of one-shot statistical mechanics\, like that of fluctuation relations\, concerns small scales and nonequilibrium states . The two frameworks were recently unified (http:// arxiv.org/abs/1409.3878 ) and inform each other. I will introduce "one-shot" tools developed in inf ormation theory to describe every trial -- every "one shot" -- of a protoco l such as work extraction or erasure. The introduction will include Renyi e ntropies and divergences\, guaranteed work\, failure probabilities\, and re source theories. This cross-pollination of one-shot statistical mechanics a nd fluctuation relations is hoped to yield insights into potential applicat ions such as molecular motors and nanoscale engines.\n\n LAST-MODIFIED:20150309T152836Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141104T160000Z DTEND:20141104T173000Z DTSTAMP:20260828T094430Z UID:7ek9ndf0qiulfp8rkkd6t4k918@google.com CREATED:20140923T134658Z DESCRIPTION:Speaker Name: Titus Neupert\n\nSpeaker Institution: Princeton \n\nTitle: Interacting surface states of three-dimensional topological ins ulators\n\nAbstract: The surface states of three-dimensional topological in sulators are celebrated for their robustness against perturbations\, provid ed that time-reversal symmetry and particle number conservation are not vio lated. In my talk\, I want to survey their possible phases in the limit whe re interactions between the surface electrons are strong. To that end\, I c hoose a spherical topological insulator geometry to make the surface amenab le to numerical studies of finite size systems. In this case\, the single-p article problem maps to that of Landau orbitals on the sphere with a magnet ic monopole at the center that has unit strength and opposite sign for elec trons with opposite spin. \n\nRestricting the single particle Hilbert space to the small region in the surface Brillouin zone that is covered by the s urface Dirac cone enforces a nontrivial quantum geometry on the problem\, r esulting in distinct real-space localization properties of the electron orb itals. Assuming density-density contact interactions\, we find superconduct ing and anomalous (quantum) Hall phases for attractive and repulsive intera ctions\, respectively. Our setup is ideally adapted to the search for recen tly proposed topologically ordered surface terminations that could be micro scopically stabilized by tailored surface interaction profiles.\n\nHost: P hilip Brydon\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20141006T195935Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T203000Z DTEND:20150415T213000Z DTSTAMP:20260828T094430Z UID:4gsmio05io14ja661vm54gatjo@google.com CREATED:20150410T152237Z DESCRIPTION:Speaker Name: Dinko Ferencek\n\nSpeaker Institution : Rutgers U niversity\n\nTitle: Multijet Searches at the LHC: Run 1 Highlights and Pro spects for Run 2\n\nAbstract : With proton beams back in the LHC\, we are o nly weeks away from the first proton-proton collisions at 13 TeV\, the next milestone at the energy frontier of particle physics. This momentous event will mark the start of the LHC Run 2 and will open the next chapter in our exploration of physics at the TeV scale. With the center-of-mass energy al most doubling with respect to Run 1\, we might be on the verge of discoveri ng new physics within the first few weeks of Run 2\, and one of the places where new physics could appear first is in multijet final states. In this t alk\, I will present some of the highlights from Run 1 multijet searches wi th the focus on the most recent results. I will conclude by briefly discuss ing Run 2 challenges and prospects.\n LAST-MODIFIED:20150410T152237Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151023T160000Z DTEND:20151023T170000Z DTSTAMP:20260828T094430Z UID:t2nb0pfimib5df29j499063jqg@google.com CLASS:PUBLIC CREATED:20151015T193733Z DESCRIPTION:Speaker Name: Steve Eckel\n \nSpeaker Institution: JQI\, NIST\n \n(Free lunch served at 11:45)\n\nTitle: Ring Bose-Einstein condensates: c hoose your own adventure\n\nABSTRACT: In this talk\, I will present some re cent results from the rings lab at NIST. Most of our experiments involve r ing-shaped Bose-Einstein condensates. These condensates are superfluids an d are able to support quantized\, persistent flows around the ring. A rota ting perturbation\, or weak link\, drives transitions between these differe nt quantized current states. To keep this talk to 30 minutes\, it will be a n audience-chosen adventure\, with three possible choices:\n1. Temperature dependence of the transitions between persistent current states. We find t hat the rotation rate needed to drive transitions between current states de pends strongly on the temperature of the condensate. We also see behavior that might be analogous to macroscopic quantum tunneling.\n2. A minimally-d estructive measurement technique for detecting the persistent current state of the ring.\n3. Resonant phonon wavepackets. In a set of recent experime nts\, we created phonon wavepackets that travel around the ring. If we cre ate wavepackets at a frequency commensurate with their orbital frequency\, the efficient energy transfer to the condensate results in enhanced atom lo ss. LAST-MODIFIED:20151015T193734Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160407T163000Z DTEND:20160407T173000Z DTSTAMP:20260828T094430Z UID:k9frao8prv41agjjqndumr33e4@google.com CREATED:20160328T162136Z DESCRIPTION:Speaker Name: Juan Restrepo\n\nSpeaker Institution: Univ. of Co lorado\n\nTitle: Glial network regularization of neuron learning dynamics\n \n \n \n LAST-MODIFIED:20160328T172952Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150810T180000Z DTEND:20150810T190000Z DTSTAMP:20260828T094430Z UID:ffear9ll6qpcnr8dvcg0tgobng@google.com CREATED:20150806T190409Z DESCRIPTION:Next Generation Lithium Ion Batteries\n\nIn other to enable 40 miles PHEVs and long electric drive range EVs\, there is a need of developi ng advanced battery systems that offer at least 250 to 300 wh/kg energy den sity. The most significant technical barrier to developing commercially via ble Plug-in Hybrid Electric Vehicles (PHEV) is the energy storage system. T he challenge is to develop batteries that are able to perform the requireme nts imposed by a PHEV system and yet meet market expectations in terms of c ost and life. In this case\, the PHEV battery will experience both deep di scharge\, like an electric vehicle\, and shallow cycling necessary to maint ain the battery for power assist in charge sustaining HEV mode. Convention al lithium-ion batteries based on metal oxides and graphite have made signi ficant progress in recent years for HEV applications\, however\, durability with the PHEV duty cycle and the ultimate cost and safety of the technolog y remain key challenges. To achieve a very high all electric drive range\, a new battery system with advanced high capacity cathode materials and stab ilized high capacity anode is needed. . In this talk\, we will disclose sev eral strategies to increase significantly the energy density of lithium bat tery trough the development of high energy and continuous gradient cathode material or composite layered-layered oxide cathode coupled with high volta ge electrolyte. We also describe some new approach of improving the cycle l ife of Si/carbon composite anode by impregnating nanosilicon particles with in graphene sheets or making a new composite system\n\nAbout the Speaker\nD r. Khalil Amine is an Argonne Distinguished Fellow and the Manager of the A dvanced Battery Technology team at Argonne National Laboratory\, where he i s responsible for directing the research and development of advanced materi als and battery systems for HEV\, PHEV\, EV\, satellite\, military and medi cal applications. Dr. Amine currently serves a committee member of the U.S. National Research Consul\, US Academy of Sciences on battery related techn ologies. Among his many awards\, Dr. Khalil is a 2003 recipient of Scientif ic America’s Top Worldwide 50 Researcher Award\, a 2008 University of Chica go distinguished performance award\, a 2009 recipient of the US Federal Lab oratory Award for Excellence in Technology Transfer\, 2013 DOE Vehicle tech nologies office award and is the five-time recipient of the R&D 100 Award\, which is considered as the Oscar of technology and innovation. In addition \, he was recently awarded the ECS battery technology award and the interna tional battery association award. Dr. Amine holds or has filed over 140 pat ents and patent applications and has over 367 publications with an h-index of 70. From 1998-2008\, Dr. Amine was the most cited scientist in the world in the field of battery technology.\nQuestions? Please contact Dr. Chunshe ng Wang at cswang@umd.edu. LAST-MODIFIED:20150806T190409Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Amine on Li-Ion Batteries for PHEVs and EVs TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160204T190000Z DTEND:20160204T203000Z DTSTAMP:20260828T094430Z UID:l66sqttb9g0hg142i8sqt6arcs@google.com CREATED:20160126T185523Z DESCRIPTION:Speaker Name: Chenggang Tao\n\nSpeaker Institution: Virginia Tech\n\nTitle: Local probe investigation of interfaces in two-dimensional m aterials\n\nAbstract: Emerging two-dimensional (2D) materials\, such as gra phene and atomically thin transition metal dichalcogenides\, have been the subject of intense research efforts for their fascinating properties and po tential applications in future electronic and optical devices. The interfac es in these 2D materials\, including domain boundaries and edges\, strongly govern the electronic and magnetic behavior and can potentially host new s tates. On the other hand these interfaces are more susceptible to thermal f luctuation and external stimuli that enable mass displacement and generate disorder. In this talk I will present our scanning tunneling microscopy (ST M) and spectroscopy (STS) explorations of edges of few layered MoS2 nanostr uctures with unique structural and electronic properties and show how step edges on TiSe2 surfaces change dynamically due to electrical fields. I will also discuss temperature evolution of quasi-1D C60 nanostructures on graph ene.\n\nhost: Ted Einstein LAST-MODIFIED:20160129T205648Z LOCATION:Room 1201 John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Chenggang Tao\, Virgina Tech TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T150000Z DTEND:20140414T163000Z DTSTAMP:20260828T094430Z UID:15ka9464at45gck0pqfmdi86t8@google.com CLASS:PUBLIC CREATED:20140102T150255Z DESCRIPTION:Speaker: James Williams\, JQI\n\nTitle:Emergent Phenomena in Qu antum Materials: Seeking Majorana Fermions\n\nAbstract: Quantum materials a llow us to access exotic ground states of electrons in condensed matters sy stems. Of topical interest are Majorana fermions\, a particle that is its o wn antiparticle that may exist in nature. Exploration emulations of these p articles in the solid state would be of fundamental interest and have the p ossibility of being used in quantum computation. In this talk I will review some recipes to create these particles and discuss the current experimenta l challenges for their realization. \n\n LAST-MODIFIED:20140408T181603Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150506T180000Z DTEND:20150506T190000Z DTSTAMP:20260828T094430Z UID:gihq7ck39a9aoepmnjllljt8rc@google.com CLASS:PUBLIC CREATED:20150402T120334Z DESCRIPTION:Speaker Name: Beni Yoshida \n\nSpeaker Institution: Caltech\n\ nTitle: Holographic quantum error-correcting codes: Toy models for the AdS/ CFT correspondence\n\nAbstract:We propose a family of exactly solvable toy models for the AdS/CFT correspondence based on a novel construction of quan tum error-correcting codes with a tensor network structure. Our building bl ock is a special type of tensor with maximal entanglement along any biparti tion\, which gives rise to an exact isometry from bulk operators to boundar y operators. The entire tensor network is a quantum error-correcting code\, where the bulk and boundary degrees of freedom may be identified as logica l and physical degrees of freedom respectively. These models capture key fe atures of entanglement in the AdS/CFT correspondence\; in particular\, the Ryu-Takayanagi formula and the negativity of tripartite information are obe yed exactly in many cases. That bulk logical operators can be represented o n multiple boundary regions mimics the Rindler-wedge reconstruction of boun dary operators from bulk operators\, realizing explicitly the quantum error -correcting features of AdS/CFT. \n\nThis is a joint work with Daniel Harlo w\, Fernando Pastawski and John Preskill LAST-MODIFIED:20150402T140800Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140310T180000Z DTEND:20140310T193000Z DTSTAMP:20260828T094430Z UID:3fql42307mtpvfkh8cpkiaqmoo@google.com CREATED:20140114T160028Z DESCRIPTION:Speaker: David Abergel\n\nInstitution: Nordic Institute for Th eoretical Physics\n\nTitle: Excitonic Condensation in Double Layer Graphene : the Role of Disorder\n\nAbstract: The existence of an excitonic condensat e in double layer graphene has been predicted theoretically\, but has not b een observed in experiment. We discuss the conditions under which this cond ensate has a critical temperature high enough to allow detection. Crucially \, disorder arising from charged impurities and corrugation in the lattice structure affects the formation of the condensate via the induced charge in homogeneity. We employ mean-field BCS theory to describe the condensate for mation\, and a numerical Thomas-Fermi-Dirac theory to describe the disorder . Combining these calculations gives realistic estimates of the likelihood of observing the condensate in different experimental situations.\n\nHost: Ed Barnes\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140207T214602Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151008T163000Z DTEND:20151008T173000Z DTSTAMP:20260828T094430Z UID:h0l1mhqua3d8np8k1gmcb7h7i8@google.com CREATED:20150930T130701Z DESCRIPTION:Title: The evolution and complexity of self-assembling structur es in biology\nSpeaker: Sebastain Ahert\, Cambridge University\, Cavendish Laboratory LAST-MODIFIED:20150930T130714Z LOCATION:IREAP Conference Room (ERB 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:APPLIED DYNAMICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141201T213000Z DTEND:20141201T223000Z DTSTAMP:20260828T094430Z UID:kb35kfan4rg6304slthrsscg7g@google.com CREATED:20141013T181120Z DESCRIPTION:Speaker Name: Mei-Ching Fok\n\nSpeaker Institution : The Compre hensive Inner Magnetosphere-Ionosphere Model\n\nTitle : The Comprehensive I nner Magnetosphere-Ionosphere Model\n\nAbstract : Simulation studies of the Earth’s radiation belts and ring current are very useful in understanding the acceleration\, transport\, and loss of energetic particles. Recently\, the Comprehensive Ring Current Model (CRCM) and the Radiation Belt Environm ent (RBE) model were merged to form a Comprehensive Inner Magnetosphere-Ion osphere (CIMI) model. CIMI solves for many essential quantities in the inne r magnetosphere\, including ion and electron distributions in the ring curr ent and radiation belts\, plasmaspheric density\, Region 2 currents\, conve ction potential\, and precipitation in the ionosphere. It incorporates whis tler mode chorus and hiss wave diffusion of energetic electrons in energy\, pitch angle\, and cross terms. CIMI thus represents a comprehensive model that considers the effects of the ring current and plasmasphere on the radi ation belts. We have performed a CIMI simulation for the storm on 5–9 April 2010 and then compared our results with data from the Two Wide-angle Imagi ng Neutral-atom Spectrometers and Akebono satellites. We identify the domin ant energization and loss processes for the ring current and radiation belt s. We find that the interactions with the whistler mode chorus waves are th e main cause of the flux increase of MeV electrons during the recovery phas e of this particular storm. When a self-consistent electric field from the CRCM is used\, the enhancement of MeV electrons is higher than when an empi rical convection model is applied. We also demonstrate how CIMI can be a po werful tool for analyzing and interpreting data from the new Van Allen Prob es mission.\n\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/spa ce-and?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.kb35kfan4rg6304slthrsscg7g&hs=121 LAST-MODIFIED:20141013T182516Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140904T200000Z DTEND:20140904T210000Z DTSTAMP:20260828T094430Z UID:9ci7eiim4ppj5e6ec4igqhch24@google.com CREATED:20140808T135621Z DESCRIPTION:Speaker Name: Peter Graham\n\nSpeaker Institution: Stanford U niversity\n\nTitle: Cosmological Production and Detection of Hidden Sectors \n\nAbstract: tk\n\n\n\n\nJoin with Google Hangouts: https://hangouts.goo gle.com/hangouts/_/physics.umd.edu/particle-theory?hceid=bGJrNjYwYTc1YjhqaD dlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.9ci7eiim4ppj5e6ec4igqh ch24&hs=121 LAST-MODIFIED:20140829T162451Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141205T170000Z DTEND:20141205T173000Z DTSTAMP:20260828T094430Z UID:ugkv5qp5i8eg8vou9ma2kfbcmg@google.com CREATED:20141202T165109Z DESCRIPTION:Speaker: Shuo Sun\, University of Maryland\n\nTitle: Ultra-fast interface between a solid-state spin and a photon\n\nAbstract: The impleme ntation of quantum network and distributive quantum information processing relies on interaction between stationary matter qubits and flying photons. The spin of a single electron or hole confined in a quantum dot is consider ed as promising matter qubit as it possesses microsecond coherence time and allows picosecond timescale control using optical pulses. The quantum dot spin can also interact with a photon by controlling the optical response of a strongly coupled cavity. Here\, we report an experimental realization of a spin-photon interface using a strongly coupled quantum dot and cavity sy stem. We show large modulation of the cavity reflection spectrum by manipul ating the spin states of the quantum dot\, which enables us to control the quantum state of a reflected photon using the single spin. The spin-photon interface is crucial for realizing a quantum logic gate or generating hybri d entanglement between a quantum dot spin and a photon. Our results represe nt an important step towards semiconductor based quantum logic devices and on-chip quantum networks.\n\nJoin with Google Hangouts: https://hangouts.go ogle.com/hangouts/_/physics.umd.edu/jqi-lunch?hceid=bGJrNjYwYTc1YjhqaDdlazZ qcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ugkv5qp5i8eg8vou9ma2kfbcmg& hs=121 LAST-MODIFIED:20141202T165222Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160303T173000Z DTEND:20160303T183000Z DTSTAMP:20260828T094430Z UID:6stvl1bq2i5ntoihgagfolems0@google.com CREATED:20160129T153933Z DESCRIPTION:Title: Nonlinear Dynamics of SQUID Metamaterials\nSpeaker: Stev en Anlage\, Physics\, UMD\n LAST-MODIFIED:20160224T174532Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160309T190000Z DTEND:20160309T200000Z DTSTAMP:20260828T094430Z UID:k3t6399c0qej12gckr76as86f4@google.com CREATED:20160225T153326Z DESCRIPTION:Speaker Name: Kenneth Rudinger\n\nSpeaker Affiliation: Sandia N ational Laboratory\n\nTitle: Enabling fault tolerance with GST\n\nAbstract: The most powerful existing threshold theorems for fault tolerant quantum c omputing require one- and two-qubit gates that are within 1e-3 to 1e-4 (in diamond norm distance) of ideal. Certifying that an experimental qubit syst em achieves this threshold thus requires (1) characterizing the full proces s matrices of its gates\, and (2)\, assigning reliable uncertainty regions. These requirements must be met for both one- and two-qubit gates\, with er rors that are small in the diamond norm distance. We demonstrate how to ach ieve all these desiderata using gate set tomography (GST). GST provides a f ull characterization (including diamond norm) that randomized benchmarking cannot\, while avoiding process tomography's reliance on pre-calibrated ope rations. We show how to put very tight (<1e-4) error bars on any single-qub it gate diamond norm using GST\, by incorporating data from long periodic c ircuits (gate sequences) akin to those that provide Heisenberg scaling in p hase estimation. We also extend GST to two-qubit gates\, by formalizing sev eral aspects of GST to enable extensive optimizations\, and discuss the tri cks required to analyze two-qubit data. We benchmark two-qubit GST using si mulated and trapped-ion data\, achieving similarly tight (<1e-4) error bars on the diamond norm. LAST-MODIFIED:20160226T182939Z LOCATION:3100 Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150615T173000Z DTEND:20150615T183000Z DTSTAMP:20260828T094430Z UID:dhuodckdtfq69ktmd07b9sethc@google.com CLASS:PUBLIC CREATED:20150604T181710Z DESCRIPTION:Speaker Name: Guido Pagano\n\nSpeaker Institution: LENS - Euro pean Laboratory for Non-Linear Spectroscopy / University of Florence\n\nTit le: Ultracold SU(N) fermions: multicolor physics and orbital magnetism\n\nA bstract: I will report on recent experiments performed at LENS with ultraco ld 173Yb Fermi gases. These two-electron atoms are characterized by a larg e nuclear spin and highly-symmetric interactions\, which result in the poss ibility of performing quantum simulations of multi-component fermionic syst ems with intrinsic and tunable SU(N) interaction symmetry. By controlling t he number of spin components N\, we have studied how static and dynamic pro perties of strongly-correlated 1D liquids of 173Yb fermions change with N\, evidencing for the first time intriguing effects caused by the interplay b etween interactions\, low-dimensionality and quantum statistics [1].\nIn ad dition to their nuclear spin\, two-electron fermions offer experimental acc ess to supplementary degrees of freedom\, in particular to long-lived elect ronically-excited states. By coherent control of the atomic state on the ul tranarrow 1S0 – 3P0 clock transition\, we have recently obtained the first demonstration of fast\, coherent spin-exchange oscillations between two fer mionic 173Yb atoms in two different electronic orbitals [2]\, which paves t he way to the observation of exotic quantum magnetism and of paradigmatic c ondensed-matter effects.\n\n [1] G. Pagano et al.\, A one-dimensional liqui d of fermions with tunable spin\, Nature Physics 10\, 198 (2014).\n[2] G. C appellini et al.\, Direct observation of coherent inter-orbital spin-exchan ge dynamics\, Phys. Rev. Lett. 113\, 120402 (2014). LAST-MODIFIED:20150605T193050Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151028T193000Z DTEND:20151028T203000Z DTSTAMP:20260828T094430Z UID:bs64j8eg8a4bngpbqv38b3r5pg@google.com CREATED:20151022T172131Z DESCRIPTION:Speaker Name: Amir Yacoby \n\nSpeaker Institution : Harvard Uni versity\n\nTitle: : Control and Entanglement of Two-Electron Spin Qubits \ n\nAbstract: Two electron quantum bits offer great potential as carriers o f quantum information. They are a controllable hybrid between spin and char ge qubits that allow them to be electrically manipulated on sub-nano second time scales while maintaining long coherence times under idling conditions . In this talk I will review some of the underlying principles of two elect ron spin qubits and demonstrate their controlled manipulation and entanglem ent. I will also discuss several of the recent approaches we have been taki ng to control and mitigate some of the decohering effects of the charge and spin baths influencing these qubits. LAST-MODIFIED:20151022T172608Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150622T150000Z DTEND:20150622T160000Z DTSTAMP:20260828T094430Z UID:gk3bv1ghtqv07jgooq9mpkpo50@google.com CREATED:20150619T183649Z DESCRIPTION:Speaker Name: Jungsang Kim\n\nSpeaker Institution: Department of Electrical and Computer Engineering\nDuke University\n \nTitle: Systems Approach to Engineering Research: From Gigapixel Cameras to Quantum Comput ers\n\nAbstract: In order for novel concepts developed in cutting-edge sci ence to have a practical impact\, they need to go through an important tran sition process that consists of three crucial elements: (1) identification of application opportunities where the new technological breakthrough can c reate a novel solution\, (2) proof-of-principle demonstration in a system w here such a solution is implemented\, and (3) a viable path for the system to be constructed in an effective way for practical deployment. Such transi tion efforts are traditionally executed outside of academic institutions\, but this poses new research and education opportunities for engineering sch ools. I will discuss two technical examples for such a transition\, one in the application of computational imaging principles towards the realization of gigapixel cameras\, and another where quantum information processing en ables potentially powerful computation and communication concepts.\n \nBiog raphy: Jungsang Kim received his B.S. degree in Physics from Seoul National University in 1992. He received his Ph.D. in Physics from Stanford Univers ity in 1999\, working on various topics on quantum optics in semiconductor devices. He worked at Bell Laboratories\, Lucent Technologies in 1999-2004\ , where he contributed to developing all-optical switching systems using ME MS technology\, and novel cellular in-building coverage solutions using dat a networking technologies. He joined the Electrical and Computer Engineerin g faculty at Duke University in 2004\, where he has worked on technology de velopment for novel quantum devices\, quantum information processing system s\, and computational imaging systems.\n\n\n\n LAST-MODIFIED:20150619T184349Z LOCATION:Room 2460 A.V. Williams Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special ECE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151202T200000Z DTEND:20151202T210000Z DTSTAMP:20260828T094430Z UID:lupfgo7qbni04hfl7hl6qopsk4@google.com CREATED:20151118T152455Z DESCRIPTION:Speaker Name: Dr. Jeremy Schittman\n\nSpeaker Institution : NAS A\n\nTitle : Life on Miller's Planet: The Habitability Zone Around Supermas sive Black Holes\n\nAbstract : In the recent movie "Interstellar" (Warning: spoiler alert!)\, a team of intrepid astronauts set out to explore a syste m of planets orbiting a supermassive black hole named Gargantua\, searching for a world that may be conducive to hosting human life. With Kip Thorne a s science advisor\, the film legitimately boasts a relatively high level of scientific accuracy\, yet is still restricted by Hollywood sensitivities a nd limitations. In this talk\, we will discuss a number of additional effec ts that may be important in determining the (in)habitable environment of a planet orbiting close to a giant\, accreting black hole like Gargantua. In doing so\, we hope to reach a greater understanding of the fascinating phys ics governing accretion\, relativity\, and astrobiology. LAST-MODIFIED:20151118T152455Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140306T210000Z DTEND:20140306T220000Z DTSTAMP:20260828T094430Z UID:s914q7ctl4qt3q51ohgm1k40e4@google.com CREATED:20140226T165456Z DESCRIPTION:Title: Naturalness after the first run of the LHC\n\nSpeaker: M arco Farina\, Cornell \n\nAbstract: The naturalness principle is under seri ous scrutiny after the discovery of a 126 SM-like Higgs boson and the lack of new physics signals at the LHC.\nIn this talk I will show how the measur ement of the Higgs couplings can be used as a probe of naturalness and how deviations from SM behaviour are in general inversely correlated with the a mount of fine-tuning. I will give two examples of such correlation.\nFirst\ , in a model independent approach\, I will point out the generic correlatio n between naturalness and the size of top partner loop contributions to Hig gs couplings to photons and gluons.\nThen in the case of an extended scalar sector\, I will study the large-lambda version of the Next-to-Minimal Supe rsymmetric Standard Model.\nFinally I will discuss a modification of the us ual criterion for naturalness and its consequences.\n LAST-MODIFIED:20140304T154644Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar **Rescheduled** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140528T200000Z DTEND:20140528T213000Z DTSTAMP:20260828T094430Z UID:hh36cus40mau4klq5av5vf67l0@google.com CREATED:20140512T160508Z DESCRIPTION:Speaker Name: Sriram Ganeshan\n\nTitle: "Topological phases in condensed matter systems: Role of symmetries\, interactions and defects."\ n\n\nAbstract: TBA\n LAST-MODIFIED:20140522T202541Z LOCATION:PHYS 2205 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140708T140000Z DTEND:20140708T150000Z DTSTAMP:20260828T094430Z UID:1cr3hh9obi1aai0isvd0o0tfl4@google.com CREATED:20140630T152911Z DESCRIPTION:Speaker Name: Chris Schroeder\n\nSpeaker Institution: Univers ity of Maryland and University of Ulm\n \nTitle: Extended Delocalizatio n Directs Absorption in Purple Bacteria\n\nAbstract: In photosynthetic pur ple bacteria\, efficient excitation energy transfer from light harvesting ( LH) units to the reaction center (RC)\, where charge separation powers meta bolism\, benefits from delocalization within single LH units or the RC. We show experimentally and theoretically that extended delocalization over mul tiple structures is important on the short time scale of absorption\, as it generates an appreciable increase in direct absorption at the RC. Interest ingly\, the requirements for directed absorption are different from those f or fast transfer\, hence we argue the processes are independent\, albeit co mplementary\, facilitators of charge separation.\n\nJoin with Google Hangou ts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJr NjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.1cr3hh9o bi1aai0isvd0o0tfl4&hs=121 LAST-MODIFIED:20140630T153322Z LOCATION:Room CSS 2115 (JQI seminar room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI/Biophysics Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160310T160000Z DTEND:20160310T170000Z DTSTAMP:20260828T094430Z UID:lsekvbc7npj38igb2avtrn0prg@google.com CREATED:20160302T150351Z DESCRIPTION:Speaker: Christine Muschik\n\nSpeaker Affililation: IQOQI-Innsb ruck\n\nTitle: Real-time dynamics of lattice gauge theories with a few-qubi t quantum computer\n\nAbstract: Gauge theories are fundamental to our under standing of interactions between the elementary constituents of matter as m ediated by gauge bosons. However\, computing the real-time dynamics in gaug e theories is a notorious challenge for classical computational methods.\nI n the spirit of Feynman's vision of a quantum simulator\, this has recently stimulated theoretical effort to devise schemes for simulating such theori es on engineered quantum-mechanical devices\, with the difficulty that gaug e invariance and the associated local conservation laws (Gauss laws) need t o be implemented.\nWe report the first experimental demonstration of a digi tal quantum simulation of a lattice gauge theory\, by realising 1+1-dimensi onal quantum electrodynamics (Schwinger model) on a few-qubit trapped-ion q uantum computer.\n\nWe are interested in the real-time evolution of the Sch winger mechanism\, describing the instability of the bare vacuum due to qua ntum fluctuations\, which manifests itself in the spontaneous creation of e lectron-positron pairs. To make efficient use of our quantum resources\, we map the original problem to a spin model by eliminating the gauge fields i n favour of exotic long-range interactions\, which have a direct and effici ent implementation on an ion trap architecture. We explore the Schwinger me chanism of particle-antiparticle generation by monitoring the mass producti on and the vacuum persistence amplitude. Moreover\, we track the real-time evolution of entanglement in the system\, which illustrates how particle cr eation and entanglement generation are directly related. Our work represent s a first step towards quantum simulating high-energy theories with atomic physics experiments\, the long-term vision being the extension to real-time quantum simulations of non-Abelian lattice gauge theories.\n LAST-MODIFIED:20160304T162640Z LOCATION:3100A Computer and Space Science Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141103T200000Z DTEND:20141103T213000Z DTSTAMP:20260828T094430Z UID:p7mceb820sk7ptl5c79vcehv3s@google.com CREATED:20140722T155538Z DESCRIPTION:Speaker: Tanumoy Mandal\, HRI\n\nTitle: LHC phenomenology of ex otic fermions\n\nAbstract: Many BSM extensions predict the existence of exo tic fermions near the\nTeV scale. I will discuss the LHC phenomenology of s uch heavy exotic\nfermions\, namely the vectorlike quarks that arise in var ious warped\nextra dimensional theories and the color octet electrons which appear\nin some quark-lepton compositeness models. In this regard\, I will \npresent a generic coupling extraction method with a toy example of\nexoti c b' and a generic combined search strategy in the context of\ncolor octet electron.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.p7mceb820sk7ptl5c79vcehv3s&hs=121 LAST-MODIFIED:20141031T193436Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151124T181500Z DTEND:20151124T193000Z DTSTAMP:20260828T094430Z UID:tprgk6kp9im0tfph39ruu051es@google.com CREATED:20151118T210224Z DESCRIPTION:Speaker Name: Sebastian Deffner\n\nSpeaker Institution : Los Al amos National Laboratory\n\nTitle : Quantum work fluctuations: notions and exact results\n\nAbstract : For isolated quantum systems thermodynamic work is usually defined within the two-time energy measurement approach. In thi s talk we will discuss recent developments and generalizations of this para digm. To this end\, we will show that the notion of quantum work and its co rresponding fluctuation theorems are not only of thermodynamic relevance\, but that they are also of interest in quantum information theory. After est ablishing the conceptual framework we will solve several pedagogical\, yet experimentally relevant\, examples analytically. In particular\, we will di scuss thermodynamic work for relativistic quantum mechanics described by th e Dirac equation\, before we will generalize the quantum fluctuation theore m to PT-symmetric quantum mechanics with unbroken PT-symmetry. \n\n LAST-MODIFIED:20151118T210455Z LOCATION:IPST building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140908T150000Z DTEND:20140908T160000Z DTSTAMP:20260828T094430Z UID:naekccuikitvuab87hrd71v5l8@google.com CREATED:20140814T155100Z DESCRIPTION:Speaker Name: Howard Carmichael\n\nSpeaker Institution: Univers ity of Auckland\, New Zealand\n\nTitle: 100 Years of Quantum Jumps: Inspir ation and Reformulation\n\nAbstract: The notion of a quantum jump is almos t synonymous with all things quantum....most certainly in the public mind. It comes to us as a resounding echo from the past\, an idea traced back to the earliest days of the "old quantum theory." In this talk I follow the qu antum jump from these early beginnings to its use as a building block of st ochastic Shroedinger equations in modern quantum optics. Experiments with t rapped ions and microwave photons in a box provide simple illustrations of the ideas.\n\nHost: Luis Orozco\n\nJoin with Google Hangouts: https://hango uts.google.com/hangouts/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1Yjh qaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.naekccuikitvuab87hr d71v5l8&hs=121 LAST-MODIFIED:20140904T171216Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150309T150000Z DTEND:20150309T160000Z DTSTAMP:20260828T094430Z UID:uucvesqrm61rilr76esbsuu664@google.com CREATED:20150203T185949Z DESCRIPTION:Speaker Name: Birgitta Whaley\n\nSpeaker Institution: UC Berkle y\n\nTitle: Novel collective states of molecules and macroscopic superposit ions\n\nAbstract: While quantum correlations in dipole-coupled arrays of mo lecules can enhance light-matter interactions\, resulting in superradiance\ , little is known about how their spectroscopic properties change when the dipole-coupling is strong enough to cause electronic polarization. In the first part of this talk I shall analyze a linear array of dipole-coupled m olecules that shows a spectroscopic signature of a quantum phase transition between regimes of weak and strong coupling\, corresponding to paraelectri c and ferro/antiferroelectric polarized phases. The linear absorption is found to show increasing superradiant enhancement as the phase transition i s approached and is singular at the transition\, after which it displays a quadratic ‘hyperradiant’ size scaling of one-photon absorption and emissio n in the strong coupling regime. Possibilities for emulating this unusual s trong coupling phase and its anomalous superradiance will be discussed. In the second part of the talk I shall summarize recent results systematizing the size of macroscopic superposition states that have led to generalizati on of the energy-time uncertainty relation to arbitrary quantum states\, wi th implications for the minimal speed of quantum transformations. LAST-MODIFIED:20150304T130837Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150422T150000Z DTEND:20150422T155000Z DTSTAMP:20260828T094430Z UID:hklqmj1h1uuf46jsmtuu0attjs@google.com CREATED:20150420T144549Z DESCRIPTION:Speaker Name: Dr. Guru Ganguli\n\nSpeaker Institution : Naval Research Laboratory\n\nTitle : Nonlinear Generation of Whistler Waves in Sp ace Plasmas\n\nAbstract : A sounding rocket based experiment to demonstrate the ability to produce and harness electromagnetic whistler waves in the i onosphere will be discussed. Release of high-speed neutral barium atoms (8 - 10 km/s) generated by a shaped charge explosion perpendicular to the Eart h’s magnetic field can be used as the source of free energy to seed lower h ybrid turbulence. The Ba atoms are photo-ionized forming a ring velocity d istribution of heavy Ba+ ions perpendicular to the ambient magnetic field t hat is known to generate lower hybrid waves [1]. The lower hybrid waves ca n be converted into electromagnetic whistler waves through nonlinear scatte ring by thermal electrons. The whistlers have large group velocity and can propagate out of the source region to affect plasma properties in remote l ocations in the magnetosphere. Induced nonlinear scattering of the lower h ybrid waves into whistler/magnetosonic waves has been theoretically establi shed [2\,3] and experimentally demonstrated in laboratory [4]. The escape of the whistlers from the ionospheric source region and the consequences on the trapped population in the Earth’s radiation belts will be analyzed.\n\ n[1] Mithaiwala et al.\, Phys Plasmas\, 17\, 042113\, 2010.\n[2] Ganguli e t al.\, Phys Plasmas\, 7\, 052310\, 2010.\n[3] Mithaiwala et al.\, Phys Pla smas\, 18\, 2011.\n[4] Tejero et al.\, Phys. Rev. Lett.\, (submitted).\n\nG urudas Ganguli is the Senior Scientist for Intense Particle Beams and Plasm a Processes at the Plasma Physics Division\, Naval Research Laboratory\, Wa shington DC. He received his B.Sc. in physics from St. Xavier's College\, Ahmedabad\, India in 1974 and Ph.D. in Physics from Boston College\, Boston \, MA in 1980. His research interests concern the study of turbulent and c oherent processes in collisional and collisionless plasmas\, dusty plasmas\ , and their applications to both space and laboratory. He has contributed t o the physics of ionospheric and magnetospheric plasmas including the dynam ics in the earth’s natural and artificial radiation belts. He is a Fellow of the American Physical Society and member of the American Physical Societ y\, American Geophysical Union\, and International Union of Radio Science.\ n\n LAST-MODIFIED:20150420T144549Z LOCATION:Kim Blg. room 1200 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Problems in Advanced Physics\, PHYS798E and ENEE698D TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140911T193000Z DTEND:20140911T203000Z DTSTAMP:20260828T094430Z UID:ubel4r65m3sqm1khgh88gu83h4@google.com CREATED:20140908T153742Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/introduction-to?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZT BAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ubel4r65m3sqm1khgh88gu83h4&hs=121 LAST-MODIFIED:20140908T153742Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to integration in superspace TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140710T180000Z DTEND:20140710T190000Z DTSTAMP:20260828T094430Z UID:lojcpe4nn3s4ub55pkosp5lkpo@google.com CREATED:20140708T160155Z DESCRIPTION:Speaker: Heli Vora\nInstitution: Stony Brook University\n\nAbst ract: Graphene's weak electron-phonon coupling and small electronic heat ca pacity are of considerable advantage for achieving highly sensitive state-o f-the-art bolometers and fast single photon detectors. To design such a rad iation detector\, it is important to study electron-phonon interaction in g raphene and its dependence on temperature\, Fermi energy\, disorder and num ber of layers. In this talk\, I will discuss our recent experimental study on graphene-superconductor junctions. In these devices\, the superconductin g contacts effectively confine hot electrons inside a graphene absorber\, a llowing access to phonon cooling regime at low temperatures. At the same ti me\, the DC transport conductance of the junction serves as a sensitive ele ctron temperature thermometer. We measure the temperature and doping depend ence of electron-phonon coupling in single and bilayer graphene. In single layer graphene we demonstrate a disorder modified T3 temperature dependence of phonon cooling power\, which agrees with the theoretical predictions. U sing an observed inverse Fermi energy dependence of the phonon cooling powe r in bilayer graphene\, we propose a way to achieve even higher sensitiviti es while maintaining linear device operation.\n\nHost: Jimmy Williams\n\n\n Join with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.u md.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW 5kYXIuZ29vZ2xlLmNvbQ.lojcpe4nn3s4ub55pkosp5lkpo&hs=121 LAST-MODIFIED:20140710T130545Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150312T163000Z DTEND:20150312T173000Z DTSTAMP:20260828T094430Z UID:22722aa5hf3nmtjdpliuvis21c@google.com CREATED:20150309T140616Z DESCRIPTION:Speaker Name: Paul So\n\nSpeaker Institution: George Mason Univ ersity\n\nTitle: Modulation of complex collective behaviors in a network of theta neurons by synaptic diversity\n LAST-MODIFIED:20150309T141004Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151019T190000Z DTEND:20151019T203000Z DTSTAMP:20260828T094430Z UID:43qkonnah83d2noktu0tkpvhus@google.com CREATED:20151012T204018Z DESCRIPTION:Speaker: Anson Hook\n\nSpeaker Institution: Princeton\, Institu te for Advanced Study\n\nTitle: Confronting the strong CP problem at the LH C\n \nAbstract: We argue that solutions to the strong CP problem motivate d ifferent searches for TeV scale physics at the LHC than are currently being emphasized. We present two solutions to the strong CP problem that requir e the existence of new colored particles with masses below 10 TeV. New mot ivated searches at the LHC would provide a strong constraint on these solut ions to the strong CP problem.\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1Yjhq aDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.43qkonnah83d2noktu0t kpvhus&hs=121 LAST-MODIFIED:20151012T204415Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141009T163000Z DTEND:20141009T173000Z DTSTAMP:20260828T094430Z UID:td1paf0p1n2hf03n0bk02o2fhg@google.com CREATED:20140912T152837Z DESCRIPTION:Speaker Name: Shmuel Fishman\n\nSpeaker Institution : Technion\ n\nTitle : Statistical description of mixed systems (chaotic and regular\n\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kY XIuZ29vZ2xlLmNvbQ.td1paf0p1n2hf03n0bk02o2fhg&hs=121 LAST-MODIFIED:20140912T152951Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151105T173000Z DTEND:20151105T183000Z DTSTAMP:20260828T094430Z UID:j496746c7pft47h5fkdo9gup10@google.com CREATED:20151001T185218Z DESCRIPTION:Core-shell microgels: smart materials with tunable properties\n Dr. Manis Chaudhuri\nHarvard University LAST-MODIFIED:20151001T185218Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140402T180000Z DTEND:20140402T193000Z DTSTAMP:20260828T094430Z UID:eg2ns3su1ggp0ou9btv3jkhdv4@google.com CREATED:20140114T160417Z DESCRIPTION:Speaker: Bela Bauer (Microsoft Station Q)\n\nTitle: Area Laws and Topological Order in a Many-body Localized State\n\nAbstract: The ques tion whether Anderson insulators can persist to finite-strength interaction s - a scenario dubbed many-body localization - has recently received a grea t deal of interest. In this talk\, I will discuss recent work with Chetan N ayak on defining such a many-body localized phase and exploring it through its entanglement properties. We formulate a precise sense in which a many-b ody localized system can be connected adiabatically to an Anderson insulato r. The most striking consequence of our definition is an area law for the e ntanglement entropy of highly excited states in such a system. We present t he results of numerical calculations for a one-dimensional system of spinle ss fermions\, which are consistent with an area law and\, by implication\, many-body localization for weak enough interactions and strong disorder. Fu rthermore\, we discuss the implications that many-body localization may hav e for topological phases and self-correcting quantum memories. We find that there are scenarios in which many-body localization can help to stabilize topological order at non-zero energy density\, and we propose potentially u seful criteria to confirm these scenarios.\n\nHost: Sriram Ganeshan\n\nhtt p://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140212T143344Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140219T183000Z DTEND:20140219T200000Z DTSTAMP:20260828T094430Z UID:rfn07vc3ddjik1etq9dubp909g@google.com CREATED:20140116T173610Z DESCRIPTION:Title: Early Universe\, Starobinsky inflation and PLANCK missio n\n\nSpeaker: Sergey Ketov\, Tokyo Metropolitan\n\nAbstract: The early univ erse cosmology can be successfully described in the theoretical framework o f modified gravity and quintessence. I review the Starobinsky inflationary scenario in this modern framework\, in light of the recent (March 2013) obs ervations by the PLANCK satellite mission. I also briefly consider preheati ng and reheating after inflation\, as well as their relation to the observa tional cosmology. Finally\, some new recent theoretical results combining i nflation\, lepto-genesis\, dark matter and dark energy with supersymmetry a re briefly outlined. LAST-MODIFIED:20140217T153121Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T190000Z DTEND:20140414T200000Z DTSTAMP:20260828T094430Z UID:rms3cnmcnfa4jbvbeaht9pm648@google.com CREATED:20140409T153708Z DESCRIPTION:Title: Composite Higgs at present and future colliders\n\nSpeak er: Duccio Pappadopulo\, LBNL and UC Berkley\n\nAbstract: \n LAST-MODIFIED:20140409T182750Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141208T200000Z DTEND:20141208T213000Z DTSTAMP:20260828T094430Z UID:ddh28c8b2j0fco7hgcjsfav4f8@google.com CREATED:20140805T132617Z DESCRIPTION:Title: The Higgs as a Probe for New Physics : Higgs Portals\, S oft Yukawas and Extended Gauge Mediation\n\nSpeaker: Arun Thalapillil\, Rut gers\n\nAbstract: The discovery of the Higgs boson has opened up new avenue s to probe for physics beyond the standard model\, and motivates us to revi sit aspects of various models in this new light. In this talk I would like to briefly discuss three topics influenced by this - searches at the LHC & future PP-colliders for SM gauge singlet states that couple to the Higgs\; supersymmetric\, radiatively-generated fermion masses in the context of Hig gs-fermion couplings and the muon anomalous magnetic moment\; and lastly\, flavor constraints on extended gauge mediation models\, that accommodate la rge A-terms. \n\nJoin with Google Hangouts: https://hangouts.google.com/han gouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1Z TBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ddh28c8b2j0fco7hgcjsfav4f8&hs=121 LAST-MODIFIED:20141204T011922Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140310T203000Z DTEND:20140310T213000Z DTSTAMP:20260828T094430Z UID:t6khfvk4ee26osqmla41d2he8c@google.com CREATED:20140203T160757Z LAST-MODIFIED:20140305T164431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics - No seminar this week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141215T200000Z DTEND:20141215T213000Z DTSTAMP:20260828T094430Z UID:jk7l7i60voe38vec3nqegtvrfg@google.com CREATED:20141103T143446Z DESCRIPTION:Title: Dark Matter Signals in Dilepton Production\n\nSpeaker: N irmal Raj\, University of Oregon\n\nAbstract: At the LHC a standard search channel for new physics is the production of a pair of leptons. New resonan ces or contact operators can be gleaned from peaks or broad deviations resp ectively in the invariant mass distribution of this channel. I'll demonstra te in this talk how hidden sectors can show up in dileptonic events through radiative corrections to the Standard Model process\, giving rise to spect acular features in the invariant mass as well as in the angular distributio ns. One compelling possibility that can be probed is that of dark matter wi th scalar messengers coupling it to the quarks and leptons. I will present constraints from dilepton spectrum measurements at the LHC and dark matter experiments\, and make predictions for the bounds from the high luminosity 14 TeV LHC as well as a 100 TeV collider.\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrN jYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jk7l7i60v oe38vec3nqegtvrfg&hs=121 LAST-MODIFIED:20141126T153927Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151106T183000Z DTEND:20151106T200000Z DTSTAMP:20260828T094430Z UID:rss9o6j2bq63eqhl2nm8dbp8b8@google.com CREATED:20151106T182037Z DESCRIPTION:**Please note that this event will take place in the second flo or seminar room\, PSC 2136**\n\nSpeaker: Prashant Saraswat\, UMD and Johns Hopkins\n\nTitle: Informal Review of Inflationary Cosmology\, Part 2\n\nAbs tract: Continuing the review of cosmic inflation from Tuesday's talk\, I wi ll discuss the spectrum of scalar and tensor fluctuations produced by infla tion and the current experimental status for these observables. In light of this I will discuss some specific models and the associated theoretical is sues. LAST-MODIFIED:20151106T182037Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140204T180000Z DTEND:20140204T193000Z DTSTAMP:20260828T094430Z UID:v256a9jfvhc4tobt9r4073k660@google.com CREATED:20140116T165134Z DESCRIPTION:Title: New Low-Frequency Gravitational Wave Detector With Super conducting Instrumentation\n\nSpeaker: Ho Jung Paik\, UMD\n\nAbstract: The recently proposed terrestrial low-frequency gravitational-wave detectors of fer the possibility of studying gravitational-wave physics in a lower frequ ency range than the audio band km-scale interferometers (LIGO\, VIRGO and K AGRA). The superconducting gravity gradiometer (SGG) is a gravitational-wa ve strain sensor in the 0.01 Hz to 1 Hz band. A low-frequency gravitationa l-wave detector based on the concept of the SGG\, called “a tunable free-ma ss gravitational-wave detector\,” was proposed as early as in 1979 by Wagon er\, Will and Paik. We outline the design for a new type of low-frequency gravitational-wave detector based on the SGG approach. By using six levita ted test masses\, a “spherical” gravitational-wave detector capable of dete cting the source direction and wave polarization could be constructed. LAST-MODIFIED:20140131T170336Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140214T180000Z DTEND:20140214T190000Z DTSTAMP:20260828T094430Z UID:rb505ggecf7jq520jec9mqjd14@google.com CREATED:20140204T190154Z DESCRIPTION:Speaker Name: Frank DelRio\n\nSpeaker Institution : NIST\n\nTit le : From Si Microdevices to PEG Nanocoatings: Exploring Advanced Materials via Nanomechanics\n\n\nAbstract : Many advanced materials are intended for use in small scale applications\, for example\, microelectronics\, microel ectromechanical systems (MEMS)\, photonics\, biotechnology\, and magnetic s torage\, or may be available only in small volumes\, for example\, during m aterials development. Developing or optimizing such materials and their pr ocessing methods thus requires measurements of structure and properties at small scales. However\, establishing processing-structure-mechanical prope rties linkages at small scales is difficult: Not only are the involved load s and displacements small\, making measurement difficult\, but issues of sp ecimen gripping and loading alignment\, which are also often problematic at large scales\, are made more difficult as well. In this presentation\, I will summarize recent work on two projects in the Nanomechanical Properties Group at NIST Gaithersburg aimed at addressing these measurement needs. T he first project investigated the deformation and fracture strength of sing le-crystal silicon via the NIST “theta-like” test specimen\, with a particu lar emphasis on using the specimens to elucidate the effects of sample geom etry and fabrication technique. Three sets of MEMS-scale single-crystal si licon theta specimens were fabricated using two deep reactive ion etching r ecipes and a temperature-controlled cryogenic plasma etching recipe\, each set resulting in a different specimen surface quality. Each sample was tes ted by instrumented indentation and finite element analysis (FEA) was used to determine sample strength. Equations developed via FEA translated load- displacement response at the load-point into stress-strain behavior across the theta web region. Strength values for each set of specimens were exami ned via Weibull statistics. The resulting surface roughness for each etchi ng recipe was determined by atomic force microscopy (AFM) and sample fragme nts were examined via field-emission scanning electron microscopy. Surface roughness topography and fracture origins located during fractographic ana lysis of tested samples were compared with strength-limiting flaw size calc ulations. The second project explored the nanomechanical properties of pol yethylene glycol (PEG) coatings on gold surfaces\, with a particular emphas is on the homogeneity of both PEG surface coverage and properties\, as thes e determine the efficacy of PEG-coated nanoparticles as cancer treatments. AFM and atomic force spectroscopy (AFS) were used to study the morphology and mechanical properties of thiol-functionalized PEG coatings on gold subs trates in solution and in air. AFM was used to investigate the morphology of PEG coatings as a function of concentration and molecular weight\; the c ommonly-observed coverage was in the form of sparse brush-like islands. AF S was used to study the mechanical properties of PEG coatings in compressio n and tension as a function of molecular weight. Together\, the various mo dels were used to map a number of mechanical properties over individual PEG islands\, which enabled a statistical approach for assessing the heterogen eity of PEG properties.\n LAST-MODIFIED:20140204T190530Z LOCATION:Room 2110 Chemical and Nuclear Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140110T183000Z DTEND:20140110T200000Z DTSTAMP:20260828T094430Z UID:57naui1vjg5bdcpb11hd5aav6g@google.com CREATED:20140107T190222Z DESCRIPTION:Speaker: Sonika Johri (Princeton)\n\nTitle: Singular Behavior of Electronic Eigenstates in the Anderson Model of Localization\n\nAbstrac t: \nThe Anderson model of localization\, formulated over fifty years ago\ , has been the \nfoundation on which our understanding of the effects of di sorder on electronic systems has been built. The countless number of scient ific papers examining this model have mostly focused on the localization-de localization transition which occurs in dimensions d>2. I will instead talk about recently discovered singular behavior which occurs in this model at large disorder\, i.e. within the insulating phase. The singularity\, which manifests itself in the form of non-analyticities in measures of wavefuncti ons such as the inverse participation ratio\, separates a regime of rare re sonant states (which evolve into the Lifshitz tail near the edge of the ban d) from typical Anderson localized states. I will discuss the effects of di sorder distribution\, dimension and system size on the singular behavior\, and the possible repercussions on the metal-insulator phase transition in d imension d=3. I will then show how a large disorder renormalization group ( LDRG) scheme can be designed which accurately captures the cross-over from normal Anderson localized states to resonant states\, and accurately reprod uces the Lifshitz tail near the band edge. Thus\, the Anderson model proves to be of utility in studying rare fluctuation phenomena in detail as well as providing a quantitative test for LDRG methods.\n\nHost: Ed Barnes\n\nh ttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140108T153053Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151104T210000Z DTEND:20151104T220000Z DTSTAMP:20260828T094430Z UID:27iugss22tjntadg1iuk32n8js@google.com CREATED:20151028T175402Z DESCRIPTION:Speaker Name: Dr. Manis Chaudhuri \n\nSpeaker Institution : Har vard University\n\nTitle : Strongly interacting classical many body systems : from dusty plasma to colloids\n\nAbstract: The explorations of universal ity and complementary features of different physical systems are of great i nterest in modern interdisciplinary research. In recent times dusty plasma is considered as the plasma state of soft matter as it shares unique comple mentary features with other popular soft matter system colloids. In dusty p lasmas\, the highly charged micron size particles levitate in the backgroun d of weakly ionized gas (plasma) and can form solid (plasma crystal)\, liqu id or gaseous phases depending on the relative strengths of the inter-parti cle interactions. The neutral gas pressure can be controlled precisely so t hat the damping rate of particles due to neutral gas friction can be made m uch less than the rate of momentum/energy exchange between microparticles. This unique feature makes the particle dynamics in plasma crystal almost un damped in low gas pressure - thus providing an essentially single species s ystem for kinetic studies in "quasi-equillibrium" phase.\n\nOn the other ha nd\, the "colloids"  are most popular and extensively investigated model s ystems in soft condensed matter physics which are defined as a wide range o f multiphase substances composed of particles (solid/liquid/gaseous) of siz es from several nanometer to several micrometers dispersed in a continuous phase. The particles in a colloids can be synthesized in a controlled proce ss based on the experimental requirements. The presence of viscous solvent makes the colloidal suspension to be in "perfect equilibrium". The micropar ticles exhibit fully damped Brownian dynamics with solvent mediated hydrody namic interactions. Otherwise\, both the systems posses several advantages\ , such as\, fully resolved particle trajectories (both in 2D and 3D)\, reac ting sensibly to external perturbation\, etc. So\, the complementary featur es of colloids and strongly coupled dusty plasmas can be exploited to study strong coupling processes (melting\, crystallization\, etc.) in nature at the ind!\n ividual particle level.\n LAST-MODIFIED:20151028T180744Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140925T163000Z DTEND:20140925T173000Z DTSTAMP:20260828T094430Z UID:dmv0ue3mj90m4pq09t5jdnk5uc@google.com CREATED:20140911T181724Z DESCRIPTION:Speaker Name: Jacob Bedrossian\n\nSpeaker Institution : UMD Dep artment of Mathematics\n\nTitle : Patlak-Keller-Segel and related models fo r collective motion of organisms\n\n\n\nJoin with Google Hangouts: https:// hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1Yjhq aDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.dmv0ue3mj90m4pq09t5j dnk5uc&hs=121 LAST-MODIFIED:20140917T204546Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151123T110000 DTEND;TZID=America/New_York:20151123T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151123T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Jun Ye\, JILA\n\nSpeaker Institution: National I nstitute of Standards and Technology and University of Colorado\n\nTitle: M aking the world’s best atomic clock\n\nAbstract: The relentless pursuit of spectroscopy resolution has been a key drive for many scientific and techno logical breakthroughs over the past century\, including the invention of la ser and the creation of ultracold matter. Our state-of-the-art laser now m aintains optical phase coherence over many seconds and provides this pierci ng resolution across the entire visible spectrum. The new capability in con trol of light has enabled us to create and probe novel quantum matter via m anipulation of dilute atomic and molecular gases at ultralow temperatures. For the first time\, we control the quantum states of more than 1000 atoms so precisely that we achieve a more stable and accurate atomic clock than a ny existing atomic clocks\, with both key clock characteristics reaching th e 10-18 level. We are also on the verge of integrating novel many-body quan tum states into the frontiers of precision metrology\, ready to advance the measurement precision beyond the standard quantum limit. Such advanced clo cks will allow us to test the fundamental laws of nature and find applicati ons among a wide range of technological frontiers. \n LAST-MODIFIED:20151120T144836Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141202T173000Z DTEND:20141202T193000Z DTSTAMP:20260828T094430Z UID:jh2pkg2jo63ks42oeneqsivumg@google.com CREATED:20141105T140033Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: Prospects for the direct detection of dark matter\n\nSpeaker: Carter Hall\, University of Maryland\n\nAbstract: The basic nature and com position of the dark matter remains one of the most important outstanding i ssues in fundamental physics. One promising approach to address this questi on is to search for the interaction of our own galaxy's dark matter halo lo cally in a terrestrial laboratory. Over the last 30 years two classes of ex periments have carried out this program: microwave cavity axion searches\, and WIMP nuclear recoil searches. Both of these techniques have already mad e much progress\, and the next 10 to 15 years are expected to be particular ly interesting as the instrumental sensitivity grows. In fact\, the experim ents being planned now are expected to cover almost all of the parameter sp ace that nature has provided for such searches. This talk will review the c urrent status of the experiments and discuss the likely path of this field in the next several years.\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/hmarkle?hceid=bGJrNjYwYTc1YjhqaDdlazZq cjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jh2pkg2jo63ks42oeneqsivumg&h s=121 LAST-MODIFIED:20141121T184503Z LOCATION:PSC 3150\, University of Maryland SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Joint Seminar w/ Johns Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150416T193000Z DTEND:20150416T203000Z DTSTAMP:20260828T094430Z UID:cj97bccqpfspnder0scqgse8u8@google.com CREATED:20150413T182618Z DESCRIPTION:Speaker: Jim Gates and William Linch\nAbstract: We will begin t alking about S. J. Gates\, "Ectoplasm Has No Topology: The Prelude"\, arXi v:hep-th/9709104\, and its connection with the Witten paper on integration. LAST-MODIFIED:20150413T182618Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to "ectoplasm" (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120127T210000Z DTEND:20120127T223000Z DTSTAMP:20260828T094430Z UID:cv9bbkivo4pj6gl2o4fbqo0fqk@google.com CREATED:20120117T175825Z DESCRIPTION:Title : Increasing Diversity in the Physical Sciences: Lessons from the Fisk-Vanderbilt Bridge Program for Partnering with Historically Bl ack Universities\n\nSpeaker Name: Professor Keivan Stassun\n\nSpeaker Insti tution : Vanderbilt University\n\nNotes: Visiting Professor\, Massachusetts Institute of Technology\n\nAbstract : We very briefly review the current s tatus of underrepresented minorities in the physical sciences: The underrep resentation of Black-\, Hispanic-\, and Native-Americans is an order of mag nitude problem. We then describe the Fisk-Vanderbilt Masters-to-PhD Bridge program as a successful model for effective partnerships with minority-serv ing institutions toward addressing this problem. Since 2004 the program has admitted 51 students\, 44 of them underrepresented minorities (60% female) \, with a retention rate of 94%. The program is on pace to become the natio n’s top producer of underrepresented minority PhDs in physics\, astronomy\, and materials science. Already\, the program leads the nation in master’s degrees in physics for African Americans\, and is one of the top ten produc ers of physics master’s degrees among all US citizens in general. We summar ize the main features of the program including two of its core strategies: (1) partnering a minority-serving institution\n and a major research univer sity through collaborative research\, and (2) using the master’s degree as a deliberate stepping stone to the PhD. We also specifically discuss one of the emerging core theories of the program: the concept of students with ‘u nrealized or unrecognized potential’. We discuss our methods to recognize a nd select for unrealized potential during the admissions process\, and how we cultivate that unrealized potential toward development of successful sci entists and leaders. LAST-MODIFIED:20120117T175832Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150430T150000Z DTEND:20150430T160000Z DTSTAMP:20260828T094430Z UID:714c1uaq5bbh3ockcnluh86i3k@google.com CLASS:PUBLIC CREATED:20150416T182128Z DESCRIPTION:Speaker: Guido Pupillo (University of Strasbourg)\n\nTitle: Fru stration induced quantum phases with Rydberg blockaded interactions\n\nAbst ract: We discuss the emergence of novel quantum phases in simple bosonic ex tended Hubbard models where particles interact via soft-shoulder potentials . In one dimension\, we demonstrate that the low energy phase can be a conf ormal cluster Luttinger liquid where the microscopic degrees of freedom cor respond to mesoscopic ensembles of particles [1]. This phase has qualitativ ely new features with respect to the conventional Tomonaga-Luttinger liquid [2]. In two dimensions\, we provide a microscopic path for the realization of an exotic superglass phase\, where superfluidity coexists with structur al disorder. Remarkably\, such a phase occurs in the absence of any externa lly imposed frustration\, e.g.\, in the lattice geometry or in the interact ions [3]. Given the simplicity and generality of the models\, these phases may be relevant for experiments with Rydberg-dressed atoms confined to opti cal lattices. \n\n[1] Cluster Luttinger Liquids of Rydberg dressed atoms in optical lattices\, M. Mattioli\, M. Dalmonte\, W. Lechner\, and G. Pupillo \, Phys. Rev. Lett. 111\, 165302 (2013)\n\n[2] Cluster Luttinger liquids an d emergent supersymmetric conformal critical points in the one-dimensional soft-shoulder Hubbard model\, M. Dalmonte\, W. Lechner\, Z. Cai\, M. Mattio li\, A. M. Lauchli\, and G. Pupillo\, arXiv:1502.00396 \n\n[1] Superglass p hase of Rydberg atoms\, A. Angelone\, F. Mezzacapo\, and G. Pupillo\, arXiv :1504.00346 LAST-MODIFIED:20150427T153613Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151007T193000Z DTEND:20151007T203000Z DTSTAMP:20260828T094430Z UID:1mmkb48qfsmp0nc5ouep0237b8@google.com CREATED:20151002T172150Z DESCRIPTION:Title : Chip-Based Signal Transducers Using Nanophotonics\nSpea ker Name: Dr. Kartik Srinivasan\nSpeaker Institution : Center for Nanoscale Science and Technology\, NIST\nAbstract : Nanophotonic geometries can be u sed to confine light to wavelength-scale volumes with low loss\, enhancing the strength of light-matter interactions dramatically and enabling the coh erent coupling between photons and other information carriers\, such as pho nons\, excitons\, or photons of another color. Our lab has been developin g such nanophotonic transducers in a variety of contexts\, for applications in photonic quantum information science\, sensing\, and metrology. In thi s talk\, I will give an overview of our work with a focus on two topics. Fi rst\, I will describe our efforts to use silicon nanophotonics to create ef ficient\, low-noise\, and low pump power frequency converters that can serv e as an interface between short-wavelength quantum light sources and the lo w-loss 1550 nm telecommunications band. Next\, I will present our developm ent of piezo-optomechanical circuits\, in which acoustic waves are coherent ly controlled through their strong interactions with radio frequency and op tical fields. I will endeavor to place this work in context with respect t o recent related developments in laser cooling of nanomechanical resonators and on-chip Brillouin lasers and amplifiers. LAST-MODIFIED:20151002T172150Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150205T203000Z DTEND:20150205T213000Z DTSTAMP:20260828T094430Z UID:36ggldmajn5d9p6kiunl2jh5b8@google.com CREATED:20150130T135444Z DESCRIPTION:We will begin studying Lott's paper "The Geometry of Supergravi ty Torsion Constraints"\, arXiv:math/0108125. For more details see Comm. Math. Phys. 133 (1990)\, 563–615\, though the arxiv paper is shorter and ea sier to read. LAST-MODIFIED:20150130T135444Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lott's paper on torsion constraints\, part 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140731T150000Z DTEND:20140731T160000Z DTSTAMP:20260828T094430Z UID:o9m8ojhbngn5fm2eoqv5s2hqpo@google.com CREATED:20140711T173552Z DESCRIPTION:Speaker Name: Vandna Gokhroo\n\nSpeaker Institution: Okinawa I nstitute of Science and Technology Graduate University\, Okinawa\, Japan\n\ nTitle: Experiments on two-photon absorption in cold 87Rb atoms using an op tical nanofiber\n\nAbstract: Optical nanofibers (ONFs)\, with subwavelengt h diameters\, have a strong evanescent field around them. When an ONF is co mbined with a cold atom setup\, the surrounding cold atoms can couple to gu ided modes of the fiber via evanescent field coupling. Here\, I will talk a bout experiments on cold atoms and an optical nanofiber (ONF) to probe 2-ph oton absorption at a few nanowatts of power. Apart from its spectroscopic i mportance\, this study will be useful for all optical switching and quantum logic gates at low powers. \nIn our experiment\, the ONF is fabricated by the heat-and-pull technique using a hydrogen:oxygen flame. Laser-cooled 87R b atoms are excited from 5S1/2 →5D5/2 via a 2-photon excitation process usi ng 5P3/2 as an intermediate level. Using a few nanowatts of 780 nm (5S1/2 → 5P3/2) and 776 nm light (5S1/2 →5D5/2) through the ONF\, the atoms are exci ted to the 5P3/2 state and thereby spontaneously emit 5.2 µm (5D5/2 →6P3/ 2) and 420 nm (6P3/2→5S1/2) photons which are coupled to the ONF. We detect the 420 nm fluorescence photons via the ONF and study effects such as Autl er-Townes splitting and power broadening in this process for such a system. Two-photon experiments on a Rb vapor will also be discussed.\n\nHost: Luis A. Orozco\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hang outs/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZT BAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.o9m8ojhbngn5fm2eoqv5s2hqpo&hs=121 LAST-MODIFIED:20140722T183702Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140415T171500Z DTEND:20140415T183000Z DTSTAMP:20260828T094430Z UID:u55r877ash3s6orbomm0b07b00@google.com CREATED:20140407T184520Z DESCRIPTION:Speaker Name: Dr. Arvind Murugan\n\nSpeaker Institution : Harva rd University\n\nTitle : Design Principles for Materials Synthesis: Lessons from Biology\n LAST-MODIFIED:20140407T184520Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151217T143000Z DTEND:20151217T153000Z DTSTAMP:20260828T094430Z UID:aajvdea1d2mbonkhlh3d3d5m4s@google.com CREATED:20151203T220115Z DESCRIPTION:Speaker Name: Ana Belén Sainz \n\nSpeaker Institute: Bristol\n\ nTitle: Postquantum steering\n\nAbstract: The discovery of postquantum nonl ocality\, i.e. the existence of nonlocal correlations stronger than any qua ntum correlations but nevertheless consistent with the no-signaling princip le\, has deepened our understanding of the foundations quantum theory. In t his work\, we investigate whether the phenomenon of Einstein-Podolsky-Rosen steering\, a different form of quantum nonlocality\, can also be generaliz ed beyond quantum theory. While postquantum steering does not exist in the bipartite case\, we prove its existence in the case of three observers. Imp ortantly\, we show that postquantum steering is a genuinely new phenomenon\ , fundamentally different from postquantum nonlocality. Our results provide new insight into the nonlocal correlations of multipartite quantum systems . LAST-MODIFIED:20151210T162416Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140822T180000Z DTEND:20140822T190000Z DTSTAMP:20260828T094430Z UID:r8a45uvk1qf7mp0p8cujj8tp7c@google.com CREATED:20140820T150903Z DESCRIPTION:Speaker Name: Cregg Yancey \n\nSpeaker Institution: Universit y of Maryland\n\nTitle: "On coincidence of gravitational waves and meter-w avelength radio\nfor multi-messenger astronomy of transients"\n\nAbstract: High-energy transients remain an important area of astrophysical study\; h owever\, little is known regarding the physics of the engines driving these transients.\nThus\, we make a case for multi-messenger astronomy\, enabled through coincidence\, using gravitational waves and prompt meter-wavelengt h radio observations to study high-energy astrophysical transients. We pre sent a method for performing and analyzing coincidence measurements to disc riminate candidate astrophysical events from background noise. We show tha t coincidence is possible within a time window of ~10 s for extragalactic s ources and within a sky region of 1.8x10^-2 sr. We determine that discrimi nating a foreground of 1 event per year requires a background false-alarm r ate (FAR) of \\Lambda ~ 2.7x10^-3 yr^-1 and that obtaining decent character ization of the background requires a minimum characterization time of 100/\ \Lambda ~ 3.7x10^4 yr. We introduce the concept of combined effective fals e-alarm rate (CEFAR) and use it to demonstrate that coincidence can yield a 17% relaxation in gravitational-wave detection threshold requirements and an 18% relaxation in radio detection requirements\; this significantly impr oves the likelihood of detecting a real astrophysical event.\nThese improve ments are considered eminently applicable to Advanced LIGO and LWA observat ional facilities for joint observations\, as well as the incorporation of o ther similar instruments\, as they become available.\n\n.\n\n\nJoin with Go ogle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks ?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNv bQ.r8a45uvk1qf7mp0p8cujj8tp7c&hs=121 LAST-MODIFIED:20140820T151417Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Gravity Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150915T171500Z DTEND:20150915T181500Z DTSTAMP:20260828T094430Z UID:9vnnfejfnk7pgbcm1ec3s2iagk@google.com CREATED:20150909T144652Z DESCRIPTION:Title : Gelation by Self-Assemble: Fundamentals and Some Applic ations\nSpeaker Name: Srinivasa Raghavan\nSpeaker Institution : UMCP\nAbstr act : With regard to fundamentals\, first we consider the "why" question. T hat is\, self-assembly leads to linear chains and these often do not seem t o be connected by chemical or physical crosslinks - why then do the samples behave as permanent gels? We will argue that certain kinds of linear filam ents can form gels through their topological interactions ("entanglements") alone\, i.e.\, without crosslinks [1]. Next\, we consider the "if" questio n with respect to gelation by small organic molecules [2]. That is\, can we predict if a small organogelator will form a gel in a given solvent? Towar ds this end\, we have conducted studies with a model gelator\, and built a framework for gelation based on Hansen solubility parameters [3-5]. Our pri ncipal finding is that there is a systematic progression in order from solu bility to slow gelation to rapid gelation to insolubility. Thus\, supra-mol ecular gelation seems to reflect a balance between solubility and insolubil ity.\n\nReferences:\n1. S. R. Raghavan and J. F. Douglas\, Soft Matter\, 8\ , 8539 (2012)\n2. S. R. Raghavan\, Langmuir\, 25\, 8382 (2009)\n3. K. K. Di ehn\, S. R. Raghavan\, et al. Soft Matter\, 10\, 2632 (2014)\n4. N. Yan\, S . R. Raghavan\, R. G. Weiss\, et al. J. Am. Chem. Soc.\, 135\, 8989 (2013)\ n5. Y. Lan\, S. R. Raghavan\, M. A. Rogers\, et al.\, Chem. Soc. Rev.\, 44\ , 6035 (2015) LAST-MODIFIED:20150909T144652Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150909T193000Z DTEND:20150909T203000Z DTSTAMP:20260828T094430Z UID:ltfk4ofnmcnutd3p69lm461h9g@google.com CREATED:20150908T190935Z DESCRIPTION:Title : Ohmic Weave: Memristor Based Neuromorphic Computing\nSp eaker Name: Christopher Krieger\, Laboratory for Physical Science\n\nContac t: Ari Mizel at ari@lps.umd.edu LAST-MODIFIED:20150908T190935Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141209T160000Z DTEND:20141209T173000Z DTSTAMP:20260828T094430Z UID:aqd1t3ufie3bvb2ogpoulrn128@google.com CREATED:20141110T154357Z DESCRIPTION:Speaker Name: Subir Sachdev\n\nSpeaker Institution: Harvard\n \nTitle: Order and criticality in the cuprate superconductors\n\nAbstract: A central mystery posed by the Cu-based high temperature superconductors has been the nature of their electronic state at low hole density. I will survey the remarkable progress made by recent experiments towards solving t his mystery\, with the first discovery of a density wave with a d-form fact or. Aspects of this discovery were anticipated by theory. I will also dis cuss implications of these advances for the higher temperature “pseudogap” state\, and for a quantum-critical point at optimal doping.\n\nHost: Sanka r Das Sarma\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20141110T154357Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140929T150000Z DTEND:20140929T160000Z DTSTAMP:20260828T094430Z UID:mq9ok9dl9a189vpa1hqj5h8o9s@google.com CREATED:20140711T170611Z DESCRIPTION:Speaker Name: Gleb Finkelstein\n\nSpeaker Institution: Duke\n\n Title: "Quantum critical behavior and Majorana fermions in a resonant leve l coupled to a dissipatie environment"\n\nAbstract: We investigate tunnelin g through a resonant level embedded in a dissipative environment\, which su ppresses tunneling rates at low temperatures. Specifically\, the resonant l evel is formed in a carbon nanotube quantum dot\, and the dissipative envir onment is realized by fabricating resistive leads. For the symmetric coupli ng of the resonant level to the two leads\, we find that the resonant peak reaches the unitary conductance e^2/h despite the presence of dissipative m odes.\n\nSimultaneously\, the width of the resonance tends to zero as a non -trivial power of temperature. We draw a connection between our system and a resonant tunneling in a Luttinger liquid and interpret the observed unita ry resonance of vanishing width in terms of a quantum critical point (QCP). We further investigate an exotic state of electronic matter obtained by fi ne-tuning the system exactly to the QCP.\n\nWe report on several transport scaling laws both near and far from equilibrium\, including a non-Fermi-liq uid quasi-linear scattering rate at the QCP\, interpreted in terms of a Maj orana mode localized at the resonant level.\n\nHost: James Williams\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.e du/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYX IuZ29vZ2xlLmNvbQ.mq9ok9dl9a189vpa1hqj5h8o9s&hs=121 LAST-MODIFIED:20140929T145909Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151015T180000Z DTEND:20151015T193000Z DTSTAMP:20260828T094430Z UID:tve35tl2m9ejb6d0plf7lcesh8@google.com CREATED:20150731T173807Z DESCRIPTION: LAST-MODIFIED:20151014T164058Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM Cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140402T173000Z DTEND:20140402T190000Z DTSTAMP:20260828T094430Z UID:mg10f8faeske2f5tapcgehd7n0@google.com CREATED:20140116T173812Z DESCRIPTION:Speaker: Achilleas Porfyriadis\n\nInstitution: Harvard\n\nTitle : Extreme mass-ratio inspirals gravity waves from Kerr/CFT\n\nAbstract: Ast ronomical observation suggests the existence of near-extreme Kerr black hol es whose horizons spin at nearly the speed of light. Properties of diffeomo rphisms imply that the dynamics of the high-redshift near-horizon region of near-extreme Kerr\, which includes the innermost-stable-circular-orbit (IS CO)\, is governed by an infinite-dimensional emergent conformal symmetry. T his symmetry may be exploited to analytically\, rather than numerically\, c ompute a variety of potentially observable processes. \nIn this talk I will show how we compute and study the conformal transformation properties of t he gravitational radiation emitted by an orbiting massive object in the lar ge-redshift near-horizon region. I will also use conformal symmetry of the near-horizon region to compute the gravitational radiation produced during the plunge phase following the object's crossing of the ISCO. LAST-MODIFIED:20140327T125743Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150721T150000Z DTEND:20150721T160000Z DTSTAMP:20260828T094430Z UID:tjh51jnqtgn2b4pg4cs3tnc4fc@google.com CREATED:20150713T175700Z DESCRIPTION:Speaker: Márton Kormos (Budapest University of Technology and E conomics)\n\nTitle: Correlations after quantum quenches in the XXZ spin cha in: Failure of the Generalized Gibbs Ensemble\n\nAbstract:\nThe topic of th ermalization of isolated quantum systems has enjoyed a lot of attention lat ely\, partially due to the fast evolving experimental techniques in cold at om systems. Until recently\, it was generally accepted that even completely isolated many-body systems self-thermalize to a certain extent: their evol ution from a non-equilibrium initial state leads to a local thermal equilib rium (Gibbs ensemble) or to the Generalized Gibbs Ensemble (GGE) for integr able systems that have extra conserved quantities.\n\nWe studied the non-eq uilibrium time evolution of the integrable spin-1/2 anisotropic Heisenberg (XXZ) spin chain\, and we found that various short-ranged spin correlators in the long-time limit deviate significantly from predictions based on the GGE hypothesis. By\ncomputing the asymptotic spin correlators within the re cently proposed quench action formalism\, however\, we find excellent agree ment with the numerical data. We therefore conclude that the GGE cannot giv e a complete description even of local observables. This surprising result reopens the quest for the correct statistical description of the equilibri um state of integrable systems.\n\nRef.: Phys. Rev. Lett. 113\, 117203 (201 4)\n\nHost: Jed Pixley\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20150713T175700Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150904T160000Z DTEND:20150904T170000Z DTSTAMP:20260828T094430Z UID:mv4a92ocmrf0r1ei6na9of0pf8@google.com CLASS:PUBLIC CREATED:20150831T121836Z DESCRIPTION:Speaker Name: Jake Smith\n \nSpeaker Institution: JQI\n\nTitle: Many-body localization in a quantum simulator with programmable random d isorder\n \nAbstract: When a system thermalizes it loses all local memory of its initial conditions. This is a general feature of open systems and is well described by equilibrium statistical mechanics. Even within a closed (or reversible) quantum system\, where the unitary time evolution retains a ll information about its initial state\, subsystems can still thermalize us ing the rest of the system as an effective heat bath. Exceptions to quantum thermalization have been predicted and observed\, but typically require in herent symmetries or noninteracting particles in the presence of static dis order. The prediction of many-body localization (MBL)\, in which disordered quantum systems can fail to thermalize in spite of strong interactions and high excitation energy\, was therefore surprising and has attracted consid erable theoretical attention. Here we experimentally generate MBL states by applying an Ising Hamiltonian with long-range interactions and programmabl y random disorder to ten spins initialized far from equilibrium. We observe a couple essential signatures of MBL: memory retention of the initial stat e and entanglement growth in the system at long times. Our platform can be scaled to higher numbers of spins\, where detailed modeling of MBL becomes impossible due to the complexity of representing such entangled quantum sta tes. LAST-MODIFIED:20150831T121909Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140424T190000Z DTEND:20140424T200000Z DTSTAMP:20260828T094430Z UID:1dkci2th1ajb23u7os18jkab9s@google.com CREATED:20140421T202445Z DESCRIPTION:Speaker: Paul Green (UMCP)\nAbstract: We will continue the disc ussion of super-Riemann surfaces and the super-Virasoro and super-Novikov-K richever algebras LAST-MODIFIED:20140421T202445Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Super-Riemann Surfaces\, Part 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151014T163000Z DTEND:20151014T190000Z DTSTAMP:20260828T094430Z UID:la8rrehj22mr1hba787isn5n58@google.com CREATED:20150825T115118Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\nSemi nar will be preceded by lunch at 12.30 pm. The talk is from 2:00 to 3:00 pm . Times are tentative.\n\nSpeaker: Liantao Wang\n\nSpeaker Institution: Uni versity of Chicago\n\nTitle: Diboson Resonances at the LHC\n\nAbstract: The search for new physics in connection with electroweak symmetry breaking is a central goal of the physics program of the LHC. Among many different pos sible signals\, diboson resonance is one of the most promising. In this tal k\, I will give an overview of new physics scenarios which can be probed wi th this search channel. I will describe possible interpretations of the pot ential excess observed in run 1. The potential of testing them\, as well as covering more ground beyond them\, at run 2 will be discussed. \n\nJoin wi th Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ to-be-announced?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kY XIuZ29vZ2xlLmNvbQ.la8rrehj22mr1hba787isn5n58&hs=121 LAST-MODIFIED:20151006T144949Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT/ Johns Hopkins Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140820T150000Z DTEND:20140820T160000Z DTSTAMP:20260828T094430Z UID:t40amau3uhtuek6f0lnfddip9c@google.com CREATED:20140818T143440Z DESCRIPTION:Speaker Name: Christian Griesinger\n\nSpeaker Institution: Max Plank Institute for Biophysical Chemistry\n\nTitle: Protein Dynamics and Ne uroprotection Studied by NMR and More.\n\n\nJoin with Google Hangouts: http s://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.t40amau3uhtuek6f 0lnfddip9c&hs=121 LAST-MODIFIED:20140818T150258Z LOCATION:Room 0112 Marker Seminar Room\, Chemistry Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140904T180000Z DTEND:20140904T193000Z DTSTAMP:20260828T094430Z UID:vd12oq6fqf2bctdna4vgl821n0@google.com CREATED:20140828T211301Z DESCRIPTION: * * * * C A N C E L L E D * * * * \n\nSpeaker: Dr. Kyle She n\, Cornell University\n\nTitle: Controlling and Observing Electronic Stru cture in Artificial Quantum Materials\n\nAbstract: Our ability to control the electronic properties of materials\, for instance at semiconductor inte rfaces\, has had enormous scientific and technological implications. Recent ly\, this concept has been extended to materials which possess inherently s trong quantum many-body interactions\, such as strongly correlated transiti on metal oxides. Epitaxial thin films offer a number of unique advantages f or manipulating the electronic properties of correlated transition metal ox ides. For example\, atomically thin films or abrupt interfaces can be synth esized to artificially confine electrons in two dimensions. Furthermore\, u sing a substrate with a mismatched lattice constant can impose large biaxia l strains of larger than 3% ($\\Delta a / a)\, much larger than can achieve d in bulk single crystals. Since these dimensionally confined or strained s ystems may necessarily be less than a few unit cells thick\, investigating their properties can be particularly challenging. We employ a combination o f reactive oxide molecular beam epitaxy (MBE) and angle-resolved photoemiss ion spectroscopy (ARPES) to investigate how dimensional confinement and epi taxial strain can be used to manipulate electronic properties and structure in correlated transition metal oxide thin films. In particular\, we report on a number of model systems : a thickness-driven metal-insulator transiti on in ultrathin LaNiO3 epitaxial thin films\, and a strain-driven Lifshitz transition in the spin-triplet ruthenate superconductor Sr2RuO4. \n\nHost: James Williams\n\nJoin with Google Hangouts: https://hangouts.google.com/h angouts/_/physics.umd.edu/cnam-condensed?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0 amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.vd12oq6fqf2bctdna4vgl821n0&hs=12 1 LAST-MODIFIED:20140904T000323Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Cond. Matter Colloq *CANCELLED* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141001T170000Z DTEND:20141001T183000Z DTSTAMP:20260828T094430Z UID:pik8de4i3depebdsoarpo16hh8@google.com CREATED:20140929T131131Z DESCRIPTION:Title: Using energy-peaks to measure (new and old) particle mas ses\n\nSpeaker: Kaustubh Agashe\, UMD\n\nAbstract: I will first analytical ly show a simple\, yet subtle "invariance" of\ntwo-body decay kinematics fo r the case of a massless daughter and a mother particle which is unpolariz ed and has a generic\nboost distribution in the laboratory frame. Namely\, the laboratory\nframe energy distribution of the massless decay product has a peak\,\nwhose location is identical to the (fixed) energy of that part icle in the\nrest frame of the corresponding mother particle. In turn\, thi s value of the energy is a simple function of the other masses involved in the decay.\nAs a proof of principle of the usefulness of this observation\, I will then apply it for\nmeasuring the mass of the top quark at the LHC\ , using simulated data (including\nexperimental effects). Finally\, I will show how it can be used to measure all the\nsuperpartner masses in a casc ade decay chain of the gluino.\n\n** Based on the papers: http://arXiv.org/ pdf/1209.0772.pdf and http://arXiv.org/pdf/1309.4776.pdf\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/nuclear- physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.pik8de4i3depebdsoarpo16hh8&hs=121 LAST-MODIFIED:20140929T131131Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150417T180000Z DTEND:20150417T190000Z DTSTAMP:20260828T094430Z UID:sqdqp4cklps179uuiqam87jrcs@google.com CLASS:PUBLIC CREATED:20150415T115104Z DESCRIPTION:Speaker: Tanya Mehlstaeubler (PTB\, Germany)\n\nTitle: Towards Optical Clocks Based on Ion Coulomb Crystals\n\nAbstract: In order to expl oit their full potential and to resolve frequencies with a fractional frequ ency instability of 10-18\, optical ion clocks need to integrate over many days to weeks. For the characterisation of systematic shifts of the clock\, as well as for applications\, such as relativistic geodesy\, these long ti mes scales pose severe limits. Scaling up the number of ions for optical cl ock spectroscopy is a natural way to significantly reduce integration times \, but is hindered so far by on-axis micromotion\, poor control of the dyna mics of coupled many body systems and systematic shifts due to interacting ions1\,2.\n\nHowever\, ion species\, such as Yb+ \, In+ or Al+ \, with low or zero quadrupole moments of the clock states are interesting candidates f or frequency standards based on multiple ions. In our experiment we investi gate linear chains of 172Yb+ and 115In+ ions for an optical clock based on the 1 S0- 3 P0 transition in 115In+ \, for which we show that a relative un certainty of 10-18 can be reached2 .\n\nFor optimum control of the ion moti on and lowest frequency shifts due to micromotion and excess heating rates we have developed a new segmented ion trap with on trap filter boards and a protected spectroscopy segment3 . The operating prototype trap with minimi zed axial micromotion allows us to trap and cool large ion Coulomb crystals \, in which we observed the creation of topological defects during the tran sition from linear to zigzag phase. The good control of the trap parameters allowed us to perform a measurement of the rate of defect creation and to study the dynamics of the phase transition4 .\n\nTo reduce systematic shift s due to blackbody radiation\, this trap design is now transferred to an Al N based chip trap\, which is laser machined at PTB. The temperature distrib ution of this trap was modelled with a FEM code and experimentally compared to IR measurements\, indicating a warming of the trap of less than 5 K. LAST-MODIFIED:20150415T115852Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160413T200000Z DTEND:20160413T210000Z DTSTAMP:20260828T094430Z UID:5l1luq13j4nu4qt67moi59938c@google.com CREATED:20160331T124247Z DESCRIPTION:Speaker Name: Meriem Abdallaoui\n\nSpeaker Institution : NASA/C atholic University\n\nTitle : Exploring Alternate Ordering of the MHD Stabi lity Limits for Coupled Tearing-Wall Modes\n\nAbstract : Return currents dr iven by non-thermal electron beams in solar flares have been proposed to ac count for the large electron flux required to explain the observed bremsstr ahlung X-ray spectra. In addition to resupplying the acceleration region wi th electrons\, these return currents can heat the coronal plasma and modify the electron distribution by flattening electron spectra at lower energies (a few deka-keV). This flattening in the electron distribution in turn fla ttens the X-ray spectrum. We show that a return current collisional thick-t arget model (RCCTTM) of Holman (2012) provides an acceptable fit to X-ray s pectra with strong breaks from 18 flares observed with the Ramaty High Ener gy Solar Spectroscopic Imager (RHESSI). This is a 1D model similar to the c ollisional thick-target model (CTTM) with the additional assumption that el ectrons lose some of their energy through return current losses along their path to the thick target\, where they lose all their remainin! g energy th rough Coulomb collisions. This model offers advantages to CTTM because it p rovides a physical explanation for the spectral break and allows derivation of physical parameters such as the coronal plasma resistivity (to be compa red to the Spitzer resistivity)\, the return current electric field\, the b eam density\, etc. I will discuss the implications of return-current energy losses on the heating of the corona during a solar flare. Our main results are: (1) The derived resistivity is enhanced typically by one and up to ei ght orders of magnitude as compared to the classical Spitzer resistivity at the loop top\, (2) The return current electric field is lower by at least an order of magnitude as compared to the Dreicer field in the higher limit of the low-energy cutoff\; this means any runaway population of electrons i n the return current is not significant. LAST-MODIFIED:20160331T124334Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140724T173000Z DTEND:20140724T183000Z DTSTAMP:20260828T094430Z UID:kaapja7s6kosajq9ae9633vjs0@google.com CREATED:20140708T155639Z DESCRIPTION:Speaker Name: Wilhelm Kaenders\n\nSpeaker Institution: Presiden t Toptica Photonics\n\nTitle:"How Cold Atoms have paved the way for the Obs ervation of Distant Stars or From the Very Cold and Small to the Ultrafar“\ n \nAbstract: Cold atoms research has to some extent\, even synergistically \, led to the development of new laser tools\, in particular tunable diode laser technology and fiber combs that are ideally matched to each other. As one would think that the high-end technology requirements of this field ar e unique\, given the exquisite lab-bound nature of the research topic\, the vastly expanding cold atom field has generated enough of a technology surg e for the development of mature laser products. They now find their usage i n the other extreme end of current research\, namely the latest generation of astronomical telescopes. As cold matter research is trying to unravel se crets of the early universe\, its „tooling“ will become the backbone for an adaptive optics implementation using laser guide stars to cope with the at mospheric issues of the same endeavor of understanding for example star for mation.\nIn the talk I will also try to give an insight into a customer-ori ented and boot-strapping high-tech company which might for the future trigg er other joint or separate technology initiatives.\n\nHost: Luis Orozco\n\n Postdocs and senior graduate students are invited to lunch with him before the seminar in room CSS 2115 at 12.30pm\n\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrN jYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.kaapja7s6 kosajq9ae9633vjs0&hs=121 LAST-MODIFIED:20140721T160230Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150323T200000Z DTEND:20150323T210000Z DTSTAMP:20260828T094430Z UID:bm2qg04rq229vcdq2ur1ll1tu8@google.com CREATED:20150312T184140Z DESCRIPTION:Refreshments @ 3:30 pm\n\nTitle: Simulations of Gamma-Ray Burst s and Jet-Powered Supernovae\n\nSpeaker: Dr. Brian Morsony\, UMD\n \nAbstr act: Hydrodynamic simulations of GRB jets offer insights into how GRBs are created\, how their observational properties come about\, and how GRBs and supernova are connected. I will present simulations of GRB jets and photos pheric emission. By following the relativistic outflow well outside the sta r\, we are able to produce prompt gamma-rays from thermal emission at the p hotosphere. With no fine-tuning\, we are able to reproduce key observationa l correlations. I will also present a series of jet simulations that produ ce a wide range of outcomes with only minor changes\, from classical GRBs\, through low-energy intermediate events\, to ordinary supernovae. LAST-MODIFIED:20150312T184149Z LOCATION:Room 1136 Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150417T170000Z DTEND:20150417T180000Z DTSTAMP:20260828T094430Z UID:mip7lof7544cjcc2jpcn2i7mfg@google.com CREATED:20150402T144028Z DESCRIPTION:Speaker Name: Rosemarie Hunziker\n\nSpeaker Institution : Natio nal Institute of Biomedical Imaging and Bioengineering\, NIH\n\nTitle: Bey ond the Bench: Careers in Grants Administration for Ph.D.-level Scientists\ n\nAbstract: Most Ph.D.s start their careers at the lab bench\, and plan f or a decade’s long journey doing cutting edge research. But we are not all cut out for that fate. Pre-doctoral training cultivates skills of enormou s value across many professional paths. A Ph.D. with post-doctoral training empowers one in advanced decision making\, time management\, data crunchin g\, and assessment of the state-of-the-art\, moving comfortably between the tactical and the strategic\, and much more. Do you have what it takes to a mass your considerable knowledge of science and make the move away from the laboratory and into the office\, the press room\, or the statehouse? This presentation will give you a start on that exploration.\n LAST-MODIFIED:20150402T144028Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T200000Z DTEND:20140331T210000Z DTSTAMP:20260828T094430Z UID:f961duunj50mi427akncvirifg@google.com CREATED:20140304T184030Z DESCRIPTION:Speaker Name: Katharina Ribbeck\n\nSpeaker Institution: MIT\n\ nTitle: Bioinspired hydrogels: tuning selective transport and microbial in teractions\n\nAbstract: Biological compartments such as organelles\, cells\ , organs\, and organisms are all surrounded by selective barriers\, which c ontrol the exchange of material between them and their environment. These b arriers typically consist of a lipid bilayer that is externally coated by a protein-polysaccharide hydrogel. The selective permeability properties of the lipid bilayer have been extensively studied in the last century. In con trast\, we know little about the structure and dynamics of biological hydro gels and how their properties allow them to act as selective barriers that permit passage of certain objects but reject others. One important and unde rstudied hydrogel is mucus\, the clear\, slimy gel that coats wet surfaces in the body of all animals. Mucus barriers have critical roles in health an d disease and changes in their structure or properties can result in diseas es ranging from dental cavity formation\, cystic fibrosis\, viral and paras itic infections\, to some forms of infertility caused by a failure of the s perm to migrate through mucus in the female genital tract. I will present o ur work on basic mechanisms by which mucus barriers exclude\, or allow pass age of different molecules and pathogens\, and the mechanisms pathogens hav e evolved to penetrate mucus barriers. We hope to provide the foundation fo r a theoretical framework that captures general principles governing select ivity in mucus\, and likely other biological hydrogels such as nuclear pore s\, and bacterial biofilms. Our work may also be the basis for the reconsti tution of synthetic gels that mimic the basic selective properties of biolo gical gel-based barriers. LAST-MODIFIED:20140324T141932Z LOCATION:0112 Chemistry Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150512T150000Z DTEND:20150512T160000Z DTSTAMP:20260828T094430Z UID:ufv4f3vutb29gfljof5p4fo8cs@google.com CLASS:PUBLIC CREATED:20150423T172337Z DESCRIPTION:Speaker: Alexei Bylinskii\n\nSpeaker Institution: MIT\n\nTitle : "Friction under microscope in a trapped-ion optical-lattice emulator"\n\n Abstract: Friction is the ubiquitous phenomenon of sticking and energy diss ipation at the interface between objects. According to the widely known emp irical laws of friction\, it is proportional to the load on the interface a nd independent of velocity. However\, atomistic models and some atomic forc e probe experiments exhibit superlubricity below a critical value of the in terface interaction strength\, as well as a complex dependence on velocity\ , temperature and the relative lattice structure. Using cold 1D ion crystal s in an optical lattice\, we study these phenomena with microscopic control and atom-by-atom sub-site resolution not available in any solid state prob es\, allowing us to build a bottom-up understanding of the physics of frict ion.\n\nHost: Chris Monroe LAST-MODIFIED:20150508T123557Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160311T190000Z DTEND:20160311T200000Z DTSTAMP:20260828T094430Z UID:tucv5u4qkoh0jnvg8pg14bnnd8@google.com CREATED:20160114T190338Z DESCRIPTION:Speaker: Todd Brun\n\nSpeaker Affiliation: USC\n\nTitle: Fault- tolerant quantum computation in multi-qubit block codes\n\nAbstract: Fault- tolerant quantum computation (FTQC) can be done in principle: the threshol d theorems show that\, for sufficiently low error rates\, it is possible to do quantum computations of arbitrary size. However\, current schemes that allow such scaling--using concatenated or surface codes--require very larg e overhead to achieve quantum computation at realistic error rates. One ap proach to reduce this overhead is to encode multiple logical qubits in a si ngle code block. By combining two different codes--one for storage and Cli fford gates\, one for non-Clifford gates--it is possible to do a universal set of encoded quantum gates by measuring logical operators and performing logical teleportation between code blocks. We analyze the performance of s uch schemes\, and for a few choices of codes show numerically that one can do quite large quantum computations at moderate error rates. One of the ke y requirements of this scheme is the ability to prepare a set of different ancilla states reliably. We present a scheme for distillation of these anc illa states\, and give evidence that it is possible to get good distillatio n rates with low residual errors. We also look at some variations of this scheme using different codes. LAST-MODIFIED:20160219T143727Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140403T190000Z DTEND:20140403T200000Z DTSTAMP:20260828T094430Z UID:88fhvchgg776246ituo3f34da0@google.com CREATED:20140331T155652Z DESCRIPTION:Speaker: Simon Requelne (UMCP)\nAbstract: We begin the discussi on of superfields and field theories with supersymmetry. LAST-MODIFIED:20140331T155652Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Superfields TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140220T173000Z DTEND:20140220T183000Z DTSTAMP:20260828T094430Z UID:dar49gpmplhth6182uma7nn97o@google.com CREATED:20140131T145224Z DESCRIPTION:Title : Sidewinding and Swimming in Sand\n\nSpeaker Name: Prof. Dan Goldman\n\nSpeaker Institution : Georgia Institute of Technology\n\nAb stract : Many limbless locomotors inhabit sandy deserts\, and the bio and n euromechanical principles by which they move effectively in dry granular me dia are largely unknown. I will describe progress we have made in understan ding locomotion both on and below the surface of granular media. We study t he above-surface locomotion of the Sidewinder rattlesnake\, Crotalus cerast es\, a snake that uses a peculiar form of locomotion called sidewinding. In this gait\, the animal translates through successive lifting of body segme nts while other segments remain in static (rolling/peeling) contact with th e ground. We find that snake employs an anti-slip strategy to negotiate gra nular inclines\, and can ascend surfaces even close to the angle of repose. Implementing this control strategy in a limbless robot enables the robot t o ascend sandy inclines with comparable ability to the animal. I will also describe our study of the subsurface locomotion of the long and slender Moj ave shovel-nosed snake\, Chionactis occipitalis. Our high speed x-ray imagi ng reveals that this snake “swims” within sand\, and we use a granular resi stive force theory (inspired by theory used to describe low Reynolds number swimmers) to model the snake’s locomotion as it swims in a self-generated granular frictional fluid. Our model reveals that the shovel-nosed snake us es a traveling wave pattern which maximizes forward speed and minimizes ene rgy consumption. Our biological studies also reveal new physics of localize d intrusion and drag in dry granular media.\n LAST-MODIFIED:20140131T145224Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140506T171500Z DTEND:20140506T183000Z DTSTAMP:20260828T094430Z UID:sd36d8mkhtfa35j1ptskrb38eg@google.com CREATED:20140422T141917Z DESCRIPTION:Speaker Name: Dr. Adolfo del Campo\n\nSpeaker Institution : Los Alamos\n\nTitle : Testing Universality of Topological Defect Formation: An Update\n LAST-MODIFIED:20140422T142048Z LOCATION:Room 1116\, IPST Bldg\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150323T200000Z DTEND:20150323T213000Z DTSTAMP:20260828T094430Z UID:r1obav8522fljahmjtjiudgs4o@google.com CREATED:20150213T153936Z DESCRIPTION:Speaker Name: Chase Shimmin\n\nSpeaker Institution: University of California\, Irvine\n\nTitle: Observing Ultra-High Energy Cosmic Rays w ith Smartphones\n\nAbstract: In this talk I discuss the possibility of usin g a network smartphones and similar devices to search for ultra-high energy ($>10^{18}$ eV) cosmic rays via a community-sourced scientific platform.\n Muons and energetic photons produced in UHECR events leave a signature of b right pixels in images from on-board CMOS cameras\, while GPS location data allows for the reconstruction of extensive air showers observed by multipl e devices.\nThe ubiquity of these consumer devices around the globe enables instrumenting a far greater area than conventional observatories\, enhanci ng sensitivity to the very rarest events.\nGiven certain levels of particip ation\, it is even possible to match the observational power of state-of-th e-art facilities such as the Pierre Auger observatory\, at the highest ener gies.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jvd XAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.r1obav8522fljahmjtjiudgs4o&hs=121 LAST-MODIFIED:20150303T134751Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150420T200000Z DTEND:20150420T213000Z DTSTAMP:20260828T094430Z UID:2e8eoibcpf2uasorvagb3v6o5g@google.com CREATED:20150105T141238Z DESCRIPTION:Speaker Name: Andrew Larkoski\n\nSpeaker Institution: MIT\n\nT itle: The Surprising Emergent Phenomena of Perturbative QCD\n\nAbstract: Tr aditionally\, for probability distributions of observables to be calculable in perturbative QCD requires the property of infrared and collinear safety . Motivated by developments in jet substructure\, it was realized that inf rared and collinear safety is overly restrictive for determining those obse rvables that are calculable perturbatively. In this talk\, I will discuss recent advances in our understanding of calculability in perturbation theor y\, and as a particularly exotic example\, introduce an observable that exh ibits ultraviolet fixed-point behavior.\n\nJoin with Google Hangouts: https ://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjY wYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.2e8eoibcpf2 uasorvagb3v6o5g&hs=121 LAST-MODIFIED:20150402T163544Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131217T200000Z DTEND:20131217T210000Z DTSTAMP:20260828T094430Z UID:n3dftr82o2ejndhiiv71ph4mhg@google.com CREATED:20131216T184942Z DESCRIPTION:Title : Magnetic field generation and amplification in an expan ding plasma\n\nSpeaker Name: Dr. Kevin Schoeffler\n\nSpeaker Institution : Instituto Superior Tecnico\n\nAbstract : Particle-in-cell simulations are u sed to investigate the formation of magnetic fields\, $\\mathbf{B}$\, in pl asmas with perpendicular electron density and temperature gradients. For s ystem sizes\, $L$\, comparable to the ion skin depth\, $d_i$\, it is shown that $B\\sim d_i/L$\, consistent with the Biermann battery effect. However \, for large $L/d_i$\, it is found that the Weibel instability (due to elec tron temperature anisotropy) supersedes the Biermann battery as the main pr oducer of $B$. The Weibel-produced fields saturate at a finite amplitude ( plasma $\\beta \\approx 100$)\, independent of $L$. The magnetic energy sp ectra below the electron Larmor radius scale is well fitted by power law wi th slope $-16/3$\, as predicted in Schekochihin \\etal\, Astrophys. J. Supp l. Ser {\\bf 182}\, 310 (2009).\n LAST-MODIFIED:20131216T185131Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150624T150000Z DTEND:20150624T160000Z DTSTAMP:20260828T094430Z UID:512sifrhi52tr121qopsb3ag6c@google.com CREATED:20150616T133304Z DESCRIPTION:Speaker: Noriko Akutsu (Faculty of Engineering\, Osaka Electro- Communication University\, Osaka\, Japan)\n\nTitle: Phase Diagram of Step F aceting on a Crystal Surface: Numerical Calculations on a Restricted Solid- on-Solid Model with Point-Contact Type Step-Step Attraction\n\nAbstract: Th e anisotropic surface tension of a vicinal (or slightly tilted) surface bas ed on a solid-on-solid (SOS) model is calculated by a density matrix renorm alization group (DMRG) method [1]. The SOS model we calculated is a restri cted solid-on-solid (RSOS) model with point-contact-type step-step attracti on (p-RSOS model) [2-5]. Here\, “restricted” means that the height differe nce between the neighboring sites is restricted to 0\, 1\, and –1. The poi nt-contact-type step-step attraction represents the energy gain which is ob tained by forming a bonding state by the orbital-overlap at the meeting poi nt of neighboring steps. The calculated surface tension shows discontinuit y in slope dependence at low temperatures [3]. Due to the discontinuity\, a step faceting phase [6] and a step droplet phase are formed [2\, 3] in ad dition to the Gruber-Mullins-Pokrovsky-Talapov (GMPT) universal phase [4]. We show a phase diagram of these three phases [5].\n\nReferences\n[1] S. R . White\, Phys. Rev. Lett. 69\, 2863 (1992). T. Nishino and K. Okunishi\, J. Phys. Soc. Jpn. 64\, 4084 (1995). Y. Hieida\, K. Okunishi and Y. Akutsu \, Phys. Lett. A233\, 464 (1997)\; New J. Phys. 1\, 7 (1999). U. Schollwöc k\, Rev. Mod. Phys. 77\, 259 (2005).\n[2] Noriko Akutsu\, Appl. Surf. Sci. 256\, 1205 (2009)\; J. Cryst. Growth 318\, 10 (2011).\n[3] Noriko Akutsu\, J. Phys.: Condens. Matter 23\, 485004 (2011)\; Phys. Rev. E 86\, 061604 (20 12)\; Phys. Rev. E online Kaleidoscope Image\, December (2012)\; J. Cryst. Growth\, 401\, 72 (2014).\n[4] E. E. Gruber and W. W. Mullins\, J. Phys. Ch em. Solids 28\, 6549 (1967). V. L. Pokrovsky and A. L. Talapov\, Phys. Rev . Lett. 42\, 65 (1979). C. Jayaprakash\, W. F. Saam\, and S. Teitel\, Phys . Rev. Lett. 50\, 2017 (1983). N. Akutsu and T. Yamamoto\, Handbook of Cry stal Growth\, ed. T. Nishinaga\, Vol. I. Elsevier (2015) pp. 265-313\; T. L . Einstein\, ibid.\, pp. 216-265.\n[5] Noriko Akutsu\, in preparation.\n[6] W. W. Mullins\, Philos. Mag. 6\, 1313 (1961). N. Cabrera\, Symposium on P roperties of Surfaces\, p. 24 (Am. Soc. Testing and Materials\, Philadelphi a 1963)\; Surf. Sci. 2\, 320 (1964).\n\nHost: Ted Einstein\n\nhttp://www.ph ysics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150616T133304Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141204T190000Z DTEND:20141204T203000Z DTSTAMP:20260828T094430Z UID:cbmcsbrjhtng4eu5no5dl569ig@google.com CREATED:20141126T233015Z DESCRIPTION:Speaker: Victor Yakovenko\, University of Maryland\n\nTitle: Tilted loop currents in cuprate superconductors\n\nAbstract: The paper bri efly surveys theoretical models for the polar Kerr effect (PKE) and time-re versal symmetry breaking in the pseudogap phase of cuprate superconductors. By elimination\, the most promising candidate is the tilted loop-current m odel\, obtained from the Simon-Varma model by tilting one triangular loop u p and another one down toward the apical oxygens. The model is consistent w ith the PKE\, spin-polarized neutron scattering\, and optical anisotropy me asurements. Spontaneous currents in this model flow between the in-plane an d apical oxygens in such a manner that each oxygen belongs to one current l oop. This loop-current pattern is similar to the spin order in the magnetoe lectric antiferromagnet Cr2O3\, where the PKE is observed experimentally. B y analogy\, it should be possible to train the PKE sign in the cuprates mag netoelectrically. Several experiments are proposed to confirm the loop-curr ent order: the magnetic-field-induced polarity\, the nonlinear anomalous Ha ll effect\, and the second-harmonic generation. A similar order parameter was recently revealed in Sr2IrO4 by nonlinear optical harmonic generation. Reference: http://arxiv.org/abs/1409.2183\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/cnam-condensed?hceid=bG JrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.cbmcsb rjhtng4eu5no5dl569ig&hs=121 LAST-MODIFIED:20141126T233137Z LOCATION:Rm 1201\, Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150413T200000Z DTEND:20150413T213000Z DTSTAMP:20260828T094430Z UID:um2ptq0008eh1puvnt7ps6q7rk@google.com CREATED:20150203T140621Z DESCRIPTION:Speaker: Michael Geller\n\nSpeaker Institution: Technion – Isra el Institute of Technology\n\nTitle: The Holographic Twin Higgs\n\nAbstract : We present the first realization of a ``twin Higgs" as a holographic comp osite Higgs model. Uniquely among composite Higgs models\, the Higgs potent ial is protected by a new SM-singlet elementary "mirror" sector at the sigm a model scale f and not by the composite states at m_{KK}\, naturally allow ing for m_{KK} beyond the LHC reach. As a result\, naturalness in our model cannot be constrained by the LHC\, but may be probed by precision Higgs me asurements at future lepton colliders\, and by direct searches for KK excit ations at a 100 TeV collider.\n\nJoin with Google Hangouts: https://hangout s.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1Yjhqa DdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.um2ptq0008eh1puvnt7ps 6q7rk&hs=121 LAST-MODIFIED:20150409T181100Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141006T190000Z DTEND:20141006T203000Z DTSTAMP:20260828T094430Z UID:6rfd8us7tuho32k374c6ovr9fs@google.com CREATED:20140813T133036Z DESCRIPTION:Speaker Name: Anton de la Fuente\n\nSpeaker Institution: UMD\ n\nTitle: Natural Inflation and Quantum Gravity\n\nAbstract: I will discuss fundamental issues in inflationary model building. In particular\, I will focus on additional constraints implied by quantum gravity. Such considerat ions are usually unnecessary in constructing effective theories for other p urposes. However\, inflation is exceptional in this regard. In the end\, I will present a simple model consistent with such considerations. \n\nJoin w ith Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu /michael?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29v Z2xlLmNvbQ.6rfd8us7tuho32k374c6ovr9fs&hs=121 LAST-MODIFIED:20141003T173813Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140318T200000Z DTEND:20140318T210000Z DTSTAMP:20260828T094430Z UID:8jstmmf6dotc53jcudrv7q5vlo@google.com CREATED:20140304T184227Z LAST-MODIFIED:20140304T185552Z SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Spring Break - No Colloquia TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121029T154500Z DTEND:20121029T163000Z DTSTAMP:20260828T094430Z UID:p1qneou2dvomvhir8np4761l4g@google.com CREATED:20121022T183413Z LAST-MODIFIED:20121022T183421Z LOCATION:Physics 1305 "F" New Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141121T174500Z DTEND:20141121T181500Z DTSTAMP:20260828T094430Z UID:f5i8uf27uo9o8n4b0lqi3oll3o@google.com CREATED:20141117T213813Z DESCRIPTION:Speaker Name: Hsin-I Lu\n\nTitle: Creating large synthetic magn etic fields in synthetic dimensions\n\nAbstract: Studying of charge partic les in magnetic field has led to several ground breaking discoveries in con densed matter physics\, including integer and fractional quantum Hall effec ts. Due to the charge neutrality of cold atoms\, a lack of Lorentz force se ems to prevent direct quantum simulation of orbit magnetism. Here\, we real ize synthetic magnetic field in a synthetic two-dimensional lattice using R b BEC. The 1st dimension is physically formed by a 1064 nm optical lattice. The 2nd dimension results from the three internal states of Rb atoms\, whi ch is equivalent to a three sites wide lattice. Utilizing Raman coupling to generate tunneling along the synthetic dimension\, the atoms pick up a non -trivial phase of φ ≈ 4/3x(2pi) when travelling around a plaquette. This ph ase mimics of the Aharonov-Bohm phase accumulated by electrons in magnetic field. We will present several orbital magnetism phenomena\, including to c hiral edge currents and cyclotron orbits.\n\nImportant note: Free lunch ser ved right before the talk!\n\n\nJoin with Google Hangouts: https://hangouts .google.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaD dlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.f5i8uf27uo9o8n4b0lqi3o ll3o&hs=121 LAST-MODIFIED:20141117T213911Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150310T180000Z DTEND:20150310T193000Z DTSTAMP:20260828T094430Z UID:qd8l0sgvf57sgsrpis53s2spnk@google.com CREATED:20150218T180526Z DESCRIPTION:Speaker: Vladimir Juricic (Utrecht University\, The Netherlands )\n\nTitle: Topological Crystalline Quantum Matter\n\nAbstract: Topological band insulators are bulk insulating states of matter\, which in the presen ce of time-reversal symmetry feature metallic states at their edge or surfa ce.\nThis state of quantum matter has been experimentally realized in the H gTe/CdTe quantum wells and various (mostly) Bismuth-based compounds.\n\nI w ill first introduce the concept of topological band insulators and then dis cuss the role of crystal symmetries in the physics of these states of quant um matter. I will derive the classification of topological band-insulators protected not only by time-reversal\, but also by space group symmetries [1 ]. As a result\, there are three broad classes of topological states: (a) G amma-states robust against general time-reversal invariant perturbations\; (b) Translationally-active states protected from elastic scattering\, but s usceptible to topological crystalline disorder\; (c) Valley (crystalline) t opological insulators sensitive to both elastic and crystalline disorder. I will also discuss probing of the topological states in the bulk by magneti c pi-fluxes and lattice dislocations both in two [2] and three dimensions [ 3].\nFinally\, some experimental implications of our classification scheme will be considered.\n\n[1] R.-J. Slager\, A. Mesaros\, V. Juricic\, and J. Zaanen\, Nature Physics 9\, 98 (2013).\n[2] V. Juricic\, A. Mesaros\, R.-J. Slager\, and J. Zaanen\, Phys. Rev. Lett. 108\, 106403 (2012).\n[3] R.-J. Slager\, A. Mesaros\, V. Juricic\, and J. Zaanen\, Phys. Rev. B 90\, 241403 (R) (2014).\n\nHost: Bitan Roy LAST-MODIFIED:20150218T180526Z LOCATION:2205 Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151102T210000Z DTEND:20151102T220000Z DTSTAMP:20260828T094430Z UID:le2r9och0to85fu0siit4r08s8@google.com CREATED:20151029T181413Z DESCRIPTION:Speaker Name: Jian Liu \n\nSpeaker Institution : NIH\n\nTitle : Two distinct actin networks mediate traction oscillations to confer mechan osensitivity of focal adhesions \n \nAbstract : Cells sense the mechanical stiffness of their extracellular matrix (ECM) by exerting traction force th rough focal adhesions (FAs)\, which are integrin-based protein assemblies. Strikingly\, FA-mediated traction forces oscillate in time and space and go vern durotaxis – the tendency of most cell types to migrate toward stiffer ECM. The underlying mechanism of this intriguing oscillation of FA traction force is unknown. Combing theory and experiment\, we develop a model of FA growth\, which integrates coordinated contributions of a branched actin ne twork and stress fibers in the process. We show that retrograde flux of bra nched actin network contributes to a traction peak near the FA distal tip a nd that stress fiber-mediated actomyosin contractility generates a second t raction peak near the FA center. Formin-mediated stress fiber elongation ne gatively feeds back with actomyosin contractility\, resulting in the centra l traction peak oscillation. This underpins observed s!\n patio-temporal pa tterns of the FA traction\, and broadens the ECM stiffness range\, over whi ch FAs could accurately adapt with traction force generation. Our findings shed light on the fundamental mechanism of FA mechanosensing and hence duro taxis.\n LAST-MODIFIED:20151029T182201Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150624T190000Z DTEND:20150624T200000Z DTSTAMP:20260828T094430Z UID:0ock5ombgt04k5llilhebekh10@google.com CLASS:PUBLIC CREATED:20150615T115540Z DESCRIPTION:Title: Wonders in flat bands: from quantum liquid crystals to self-correcting quantum memory\n\nSpeaker: Guanyu Zhu\, Northwestern Univer sity\n\nAbstract: In this talk\, I will discuss two cases where flat bands in frustrated lattice models lead to emergence of interesting physics. \n\ nIn the first part\, I talk about a family of interacting boson models base d on a kagome lattice with local synthetic gauge flux\, which can be realiz ed in optical lattices with ultra-cold atoms or circuit-QED lattices with i nteracting photons. Such models have a lowest flat band in the single-parti cle spectrum. The flat band is spanned by eigenstates forming localized loo ps on the lattice\, with the maximally compact loop states typically breaki ng the discrete rotational symmetry of the lattice. When populated by local ly-interacting particles\, the close packing of such maximally compact loop states leads to a nematic loop crystal ground state. We predict that incre asing the filling beyond the close packing fraction leads to the formation of quantum liquid crystals including a nematic supersolid and a nematic sup erfluid phase. We also show how the nematicity can be probed by time-of-fli ght experiments or phase imprinting techniques [1].\n\nIn the second part\, I discuss how 4-body spin interactions can emerge in a 2D flat-band lattic e with “Aharonov-Bohm cages”\, and in the presence of light-matter interact ions. Based on such an idea\, one can realize the surface-code Hamiltonian in the ultra-strong coupling regime of a circuit-QED lattice\, when the in teraction strength is comparable to the microwave photon frequency. Two ty pes of 4-body stabilizer interactions are realized by utilizing the electro -magnetic duality in circuit-QED. In such case\, the circuit-QED vacuum has topological degeneracies and can be used as a self-correcting quantum memo ry. An alternative approach without ultra-strong coupling is to simulate the surface-code Hamiltonian in the rotating frame\, with side-band driving through modulating the flux penetrating SQUID couplers. \n\n[1] Guanyu Z hu\, Jens Koch and Ivar Martin\, arXiv:1411.0043 LAST-MODIFIED:20150615T115540Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150226T173000Z DTEND:20150226T183000Z DTSTAMP:20260828T094430Z UID:kimos2bh0hfjupc10joltt3v90@google.com CREATED:20150220T181744Z DESCRIPTION:Speaker Name: John Bechhoefer\n\nSpeaker Institution : Simon Fr aser University\n\nTitle : High precision test of Landauer's principal in a feedback trap\n\n LAST-MODIFIED:20150220T181758Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141208T160000Z DTEND:20141208T170000Z DTSTAMP:20260828T094430Z UID:b7u54k58fgbt583uc3hs13788o@google.com CREATED:20140711T173150Z DESCRIPTION:Speaker Name: Andrew Houck\n\nSpeaker Institution: Princeton\n \nTitle: Many-body quantum optics in coupled cavity QED arrays\n\nAbstract: Superconducting circuits and circuit quantum electrodynamics provide an e xcellent toolbox for non-equilibrium quantum simulation. In circuit QED\, t he strong interaction of light with a single qubit can lead to strong qubit -mediated photon-photon interactions. Recent theoretical proposals have pre dicted phase transitions in arrays of these cavities\, demonstrating that c omplex matter-like phenomena can emerge with such interacting photons. Due to inevitable photon dissipation and the ease of adding photons through dri ving\, these systems are fundamentally open and a useful tool for studying non-equilibrium physics. I will discuss recent experimental and theoretical progress towards realization of these non-equilibrium quantum simulators\, including a localization-delocalization crossover in a pair of coupled cav ities and preliminary measurements of large cavity arrays and multi-mode ca vities. I will show a variety of available measurement tools in these sys tems\, including transport and scanned local quantum probes.\n\nHost: James Williams\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.b7u54k58fgbt583uc3hs13788o&hs=121 LAST-MODIFIED:20141205T131745Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140910T200000Z DTEND:20140910T210000Z DTSTAMP:20260828T094430Z UID:pu4pi1pnc2ejr67mh7rkc6075s@google.com CREATED:20140904T194641Z DESCRIPTION:Speaker Name: Carlos Talamas\n\nSpeaker Institution : Universit y of Maryland\, Baltimore County\n\nTitle: Plasma Diagnostics in the Era o f Additive Manufacturing\n\nAbstract: Plasma diagnostics are an essential component of plasma experiments. A significant fraction of an experiment’s budget and operation has traditionally been dedicated to the design\, const ruction\, and implementation of these diagnostics. Additive manufacturing\, also known as 3D-printing\, is rapidly evolving and becoming as ubiquitous in laboratories as paper printers. These 3D-printers are capable of printi ng in plastics\, ceramics\, and metals. A paradigm shift in the design and manufacturing of plasma diagnostics is necessary to realize the vast potent ial of additive manufacturing that can be applied to plasma diagnostics. In this presentation\, examples of plasma diagnostics that can benefit from t his technology as well as the challenges of making plasma-facing 3D-printed components are discussed. An experimental program\, under development at U MBC to address the challenges of 3D-printing plasma diagnostics\, is also d escribed.\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hango uts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jvd XAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.pu4pi1pnc2ejr67mh7rkc6075s&hs=121 LAST-MODIFIED:20140904T205149Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140227T190000Z DTEND:20140227T200000Z DTSTAMP:20260828T094430Z UID:lumlt1fc9pnh7nete1fs68uuvg@google.com CREATED:20140108T164427Z DESCRIPTION:Speaker: Aditi Mitra\n\nInstitution: New York University\n\nTi tle: Quench Dynamics in interacting field-theories\n\nAbstract: Due to exp eriments in cold-atomic gases\, the study of quantum quenches has become an active topic of research. While many rigorous results exist for exactly so lvable "free" theories\, not much is known about the effect of non-linearit ies\, especially at long times and for systems in the thermodynamic limit\, where numerical studies are challenging. In this talk\, in order to highl ight the main questions\, I will first present results for a quench in an e xactly solvable theory\, namely the Luttinger model. I will then present re sults for the effect of various non-linearities such as a commensurate peri odic potential and a local back-scattering potential.\n\nI will show that t he dynamics following a quench can be quite complex by being characterized by three regimes. One is a short time perturbatively accessible regime whic h depends on microscopic parameters\, the second is an intermediate time pr ethermalized regime where inelastic effects are weak and correlation functi ons can show universal scaling behavior which is quantified by a nonequilib rium generalization of the Callan-Symanzik equations. The third is a long t ime regime where inelastic effects become important. For the case of the co mmensurate periodic potential\, I will show that these inelastic effects ca use the system to eventually thermalize\, where the thermalization time dep ends in a non-monotonic way on the quench amplitude. \n\nHost: Victor Gali tski LAST-MODIFIED:20140207T213546Z LOCATION:Physics Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140909T150000Z DTEND:20140909T163000Z DTSTAMP:20260828T094430Z UID:41u9jbuioehs5lh9p037s6l8is@google.com CREATED:20140825T164709Z DESCRIPTION:Speaker Name: Andrea Young \n\nSpeaker Institution: (Pappalard o Fellow\, MIT)\n\nTitle: Tuning and probing symmetry breaking in graphene quantum Hall ferromagnets\n\nAbstract: In monolayer and bilayer graphene\, the carbon sublattices endow the electron wavefunctions with an additional valley degeneracy. At high magnetic fields\, this manifests as highly sym metric multicomponent Landau levels\, in which the dominant mechanism for s ymmetry breaking is due to electronic interactions. In this talk\, I will discuss our recent efforts to probe and manipulate the resulting many body ground states. First I will describe experiments on charge neutral monolaye r graphene\, in which the nature of the symmetry breaking within the combin ed spin/valley space is directly linked to the edge state structure. Using large in-plane magnetic fields\, we induce a quantum spin Hall (QSH) effec t analogous to time reversal symmetry protected topological insulators but protected by an emergent spin-rotation symmetry. The properties of the res ulting helical edge states can be modulated by balancing the applied field against an intrinsic antiferromagnetic instability\, which tends to spontan eously break the spin-rotation symmetry. In the resulting canted antiferro magnetic (CAF) state\, we observe transport signatures of gapped edge state s\, which constitute a new kind of one-dimensional electronic system with t unable band gap and associated spin-texture.\n\nFinally I will discuss rece nt experiments in bilayer graphene\, where the sublattices giving rise to t he valley degeneracy are on different layers. We use this fact to capaciti vely detect the layer polarization in bilayer graphene\, allowing us to dir ectly constrain the order parameter across a wide range of parameters.\n\nH ost: Jay Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20140904T172918Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151104T190000Z DTEND:20151104T203000Z DTSTAMP:20260828T094430Z UID:selj7j6ffv7kos59srul77ksmo@google.com CREATED:20151028T143855Z DESCRIPTION:Speaker Name: Prashant Saraswat\n\nSpeaker Institution: UMD and Johns Hopkins\n\nTitle: Inflation and the Weak Gravity Conjecture\n\nAbstr act: Cosmic inflation can readily involve scales close to the Planck mass w here quantum gravity effects become important. While one could still hope t o describe inflation within an effective quantum field theory\, general con siderations of black hole quantum mechanics suggest nontrivial constraints on any effective field theory model of inflation that emerges as a low-ener gy limit of quantum gravity. Particularly important constraints are imposed by the Weak Gravity Conjecture\, which I'll discuss and motivate. We show that higher-dimensional gauge and gravitational dynamics can satisfy these constraints and lead to a viable\, theoretically-controlled and predictive class of natural inflation models. LAST-MODIFIED:20151030T185616Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140729T171500Z DTEND:20140729T181500Z DTSTAMP:20260828T094430Z UID:33homf1lm6jav7v7r1l03svjdk@google.com CREATED:20140724T132504Z DESCRIPTION:Speaker Name: Dr. Carey King\n\nSpeaker Institution: University of Texas at Austin\n\nTitle: Quantifying the Energy-Complexity Spiral\n\n Abstract: This talk presents ideas related to understanding the relationsh ip between energy (or natural resources) and economic organization and diff erentiation (or complexity). Researchers such as Joseph Tainter posit the “ energy-complexity spiral”. He posits that as societies grow\, they (i) must become more complex to solve new problems\, (ii) in order to become more c omplex\, they must consume more energy\, and (iii) increasingly complex tec hnologies are required to extract lower quality resources. Here Dr. King p resents recent work regarding how to measure and track complexity in the U. S. economy to find evidence for or against the “energy-complexity spiral”. He compares information theory and other existing metrics of economic tran sactions to metrics of energy and net energy. Initial calculations show tha t when U.S. primary energy consumption grew exponentially until 1970\, the U.S. domestic economic structure (Use and Make matrices) became less compl ex. However\, after 1970\, U.S. primary energy consumption grew more linear ly\, and the domestic economic structure grew more complex.\n\nSpeaker Bio: Dr. Carey W King performs interdisciplinary research related to how energ y systems interact within the economy and environment as well as how our po licy and social systems can make decisions and tradeoffs among these often competing factors. The past performance of our energy systems is no guarant ee of future returns\, yet we must understand the development of past energ y systems. Carey’s research goals center on rigorous interpretations of th e past to determine the most probable future energy pathways.\nCarey is Ass istant Director at the Energy Institute at The University of Texas at Austi n\, and Research Associate with the Center for International Energy and En vironmental Policy within the Jackson School of Geosciences.\n\nHosted by V ictor Yakovenko and Safa Motesharrei\n\n\nJoin with Google Hangouts: https: //hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1Yj hqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.33homf1lm6jav7v7r1 l03svjdk&hs=121 LAST-MODIFIED:20140724T133216Z LOCATION:Computer and Space Sciences Building (CSS)\, Room 4301 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141023T150000Z DTEND:20141023T163000Z DTSTAMP:20260828T094430Z UID:g9d3is64p3fo8g2r30j9u5cuvs@google.com CREATED:20141016T130151Z DESCRIPTION:Speaker Name: John Preskill\n\nSpeaker Institution: Caltech\n\n Title: Fault-tolerant quantum gates for topological codes\n\nAbstract: TBD \n\nHost: Jay D. Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20141020T145950Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160321T170000Z DTEND:20160321T180000Z DTSTAMP:20260828T094430Z UID:8vpver12hpvvldv71cnupvd0n8@google.com CREATED:20160307T204937Z DESCRIPTION:Speaker: Barbara Terhal\n\nSpeaker Affilliation: Aachen Univers ity\n\nTitle: Adiabatic and time-independent universal computing on a 2D la ttice with simple 2-qubit interactions\n\nAbstract: We show how to perform universal Hamiltonian and adiabatic computing using a time-independent Hami ltonian on a 2D grid describing a system of hopping particles which string together and interact to perform the computation. In this construction\, th e movement of one particle is controlled by the presence or absence of othe r particles\, an effective quantum field effect transistor that allows the construction of controlled-NOT and controlled-rotation gates. The construct ion translates into a model for universal quantum computation with time-ind ependent 2-qubit ZZ and XX+YY interactions on an (almost) planar grid. The effective Hamiltonian is arrived at by a single use of first-order perturba tion theory avoiding the use of perturbation gadgets. The dynamics and spec tral properties of the effective Hamiltonian can be fully determined.\nRefe rence: S. Lloyd and B.M. Terhal\, New Journal of Physics Vol. 18 (2016).\n LAST-MODIFIED:20160307T204937Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141030T193000Z DTEND:20141030T203000Z DTSTAMP:20260828T094430Z UID:a5rqnaaibsdgskviot9plmlv6s@google.com CREATED:20141024T171244Z DESCRIPTION:Speaker: Paul Green\nAbstract: We will try to discuss how one c ould extend the work of Chavelley-Eilenberg to the case of supermanifolds.\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/super-lie?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZ W5kYXIuZ29vZ2xlLmNvbQ.a5rqnaaibsdgskviot9plmlv6s&hs=121 LAST-MODIFIED:20141024T171245Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Super-Lie algebra cohomology and de Rham cohomology on supermanifol ds TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151112T190000Z DTEND:20151112T200000Z DTSTAMP:20260828T094430Z UID:3mi9pg0l9e3iq6vpdq3pibkdj0@google.com CREATED:20151105T173912Z DESCRIPTION:SPEAKER: Lincoln J. Lauhon\, Northwestern University\n\nTITLE: “Novel behaviors in 2-D materials and devices”\n\nABSTRACT: Low-dimension al materials enable the creation of new classes of devices with novel funct ionality arising from their geometries (e.g. 1-D nanowire core-shell hetero structures) and unique materials combinations (e.g. 2-D van de Waals hetero structures). However\, there remain significant gaps in understanding of th e the origins of device behaviors. While 2-D materials beyond graphene are becoming “clean” enough to explore mesoscopic transport phenomena\, the inf luence of dopants and defects on the intrinsic properties of 2-D materials is just beginning to be explored. In nanoscale heterojunction devices\, ext rinsic influences are very strong due to the extreme thinness. Our group un dertakes correlated characterization of nanoscale structure and properties to understand intrinsic and extrinsic influences on the behavior of electro ns\, photons\, and phonons at heterojunctions in the low dimensional limit. A change in thickness of only a monolayer\, for example\, has a profound i nfluence on the behavior of 2-D heterojunctionS\,[1] presenting the signifi cant challenge of connecting atomic scale electronic structure to microscal e device behavior. We also find that point defects have sometimes counterin tuitive influences on electronic propertieS\,[2] and that combinations of p oint and line defects can be exploited to produce a new class of device tha t might be used for neuromorphic computing..[3] Finally\, the extreme thinn ess enables access to new regimes of materials response.[4] The talk will i dentify challenges in material science that are motivated by the interest i n exploring new physics and exploiting novel behaviors in devices.\n\n[1] S . L. Howell et al. "Investigation of Band-Offsets at Monolayer–Multilayer M oS2 Junctions by Scanning Photocurrent Microscopy" Nano Lett. 15\, 2278 (20 15)\; [2] I. S. Kim\, et al. "Influence of Stoichiometry on the Optical and Electrical Properties of Chemical Vapor Deposition Derived MoS2" ACS Nano 8\, 10551 (2014)\; [3] V. K. Sangwan et al. "Gate-tunable memristive pheno mena mediated by grain boundaries in single-layer MoS2" Nature Nanotechnolo gy 10\, 403 (2015)\; [4] Chang-Hua Liu et al. "Optical control of mechanica l mode-coupling within a MoS2 resonator in the strong-coupling regime" Nano Lett. 15\, 6727 (2015).\n\nHOST: Marina Leite LAST-MODIFIED:20151105T173912Z LOCATION:Room 1201 John S Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Lincoln Lauhorn\, Northwestern TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150910T163000Z DTEND:20150910T173000Z DTSTAMP:20260828T094430Z UID:smch0mv18ihbab6t72gbo7l8ig@google.com CREATED:20150903T134313Z DESCRIPTION:Prof. James A. Yorke [IPST\, UMD]\, "Why the Moon Stays Where i t Belongs: An Introduction to Quasiperiodicity" LAST-MODIFIED:20150910T124541Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160212T170000Z DTEND:20160212T180000Z DTSTAMP:20260828T094430Z UID:5gbu91339qpl78driam2u3vh04@google.com CLASS:PUBLIC CREATED:20160204T200341Z DESCRIPTION:Speaker Name: Alireza Shabani\n\nInstitution: Google\n\n(Free l unch served at 11:45)\n\nTitle: Quantum Annealing and its Digital Implement ation\n\nAbstract: Quantum annealing (QA) is a heuristic method to solve op timization problems by utilizing quantum fluctuations to find a physical sy stem in a near minimum-energy state. QA promises to computationally outperf orm classical algorithms for certain class of optimization problems. For p roblem sizes of practical interest\, we cannot emulated QA on classical com puters\, instead we need a special quantum hardware to run QA. In this talk \, I discuss a set of criteria for a computationally powerful quantum annea ler device and describe our recent experiment on quantum circuit implementa tion of QA with superconducting qubits. LAST-MODIFIED:20160210T204458Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T160000Z DTEND:20140327T170000Z DTSTAMP:20260828T094430Z UID:j1mo0emvqukib76rqagf6mehs4@google.com CREATED:20140319T190036Z DESCRIPTION:The theme for this mini-symposium is "Neutron Stars as Physics Labs: Future Opportunities with NICER". Lunch will be provided at 12:30 an d talks will run from 1:30-5:30 (coffee break from 3:15-3:45) in the Goddar d Visitors Center meeting room. Speakers and titles / topics:\n\nDavid Nic e (Lafayette College): Pulsar Timing and NS mass measurements Zaven Arzoum anian (USRA/GSFC): NICER science and mission overview Craig Markwardt (GSF C): X-ray timing of Accreting Millisecond Pulsars Oleg Kargaltsev (GWU): Is olated NSs and non-accreting pulsars Cole Miller (UMD): Mass - Radius const raints for NS from pulse profile modeling Simin Mahmoodifar (UMD): Probes o f dense matter phases in NS Kostas Kalapotharakas (UMCP/GSFC): Gamma-ray pu lsar modeling and Fermi results Teruaki Enoto (RIKEN/GSFC Collaborator): N ICER concentrators\, status\, calibration and science Tod Strohmayer (GSFC) : X-ray bursts and superbursts as Probes of NS Sam Gralla (UMD): NS magneto spheres\n\nThe Visitors Center is at 8800 Greenbelt Road\; directions are a t http://www.nasa.gov/centers/goddard/visitor/directions/. Note that the V isitors Center is NOT behind the gate\, so a GSFC visitor's badge is not ne eded to attend the symposium.\n LAST-MODIFIED:20140320T132831Z LOCATION:GSFC Visitor's Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland-Goddard Joint Space-Science Institute (JSI) "mini-symposiu m" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141021T200000Z DTEND:20141021T210000Z DTSTAMP:20260828T094430Z UID:j6v900etfrlle7ptmtqnce9imo@google.com CREATED:20140718T150719Z DESCRIPTION:Speaker Name: John Preskill\n\nSpeaker Instituion: California Institute of Technology\n\nTitle: Quantum computing and the entanglement frontier\n\nAbstract: The quantum laws governing atoms and other tiny obje cts seem to defy common sense\, and information encoded in quantum systems has weird properties that baffle our feeble human minds. John Preskill will explain why he loves quantum entanglement\, the elusive feature making qua ntum information fundamentally different from information in the macroscopi c world. By exploiting quantum entanglement\, quantum computers should be a ble to solve otherwise intractable problems\, with far-reaching application s to cryptology\, materials science\, and medicine. Preskill is less weird than a quantum computer\, and easier to understand.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/physics?h ceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ .j6v900etfrlle7ptmtqnce9imo&hs=121 LAST-MODIFIED:20141015T140903Z LOCATION:PSC Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160303T203000Z DTEND:20160303T220000Z DTSTAMP:20260828T094430Z UID:sh5lkgl4koojkuls2i0jemdu7s@google.com CREATED:20160226T160230Z DESCRIPTION:Speaker: Paul Green (UMCP) - \n LAST-MODIFIED:20160226T160230Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Universal conformal semigroup after Segal TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160324T193000Z DTEND:20160324T210000Z DTSTAMP:20260828T094430Z UID:p8di7f9nf60prkdoavo0sniqic@google.com CREATED:20160322T124819Z DESCRIPTION:Speaker: Marco Aldi (Virginia Commonwealth)\nAbstract: Building on earlier results of Borisov\, we describe a conceptual proof of Berglun d-Hübsch mirror symmetry. We also describe a variant of our construction th at is remarkably effective in the study of certain arithmetic properties of the underlying mirror dual Calabi-Yau's. This is joint work with Andrija P eruničić.\n LAST-MODIFIED:20160322T124819Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Arithmetic Berglund-Hubsch Duality TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140213T190000Z DTEND:20140213T200000Z DTSTAMP:20260828T094430Z UID:eqnqden904av2icuqmuir5fg2k@google.com CREATED:20140206T180226Z DESCRIPTION:Title : Active Space Experiments\n\nSpeaker Name: Alireza Mahmo udian\n\nSpeaker Institution : Virginia Tech\n\n LAST-MODIFIED:20140207T213345Z LOCATION:CSS 2316 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150529T160000Z DTEND:20150529T170000Z DTSTAMP:20260828T094430Z UID:h28lan9buj250788d8cgt8ha3o@google.com CLASS:PUBLIC CREATED:20150521T143257Z DESCRIPTION:Speaker Name: Kale Johnson\n\nSpeaker Institution: JQI\n \nTit le: Ultrafast Interferometric Sensing of Atomic Motion over a Wide Dynamic Range\n \nAbstract: We report sensing of the motional state of an atomic io n using ultrafast momentum transfers from a pulsed laser to create an ion i nterferometer. We separate the atomic wavepacket in phase space\, where int erference with itself at a variety of points allows us to perform state tom ography\, giving a map of the atomic motional state. One important applica tion is the measurement of an average phonon number in a harmonic oscillato r. This works inside of\, and far outside the Lamb-Dicke regime\, where the motional wavepacket is not small compared to the wavelength of light perfo rming the momentum transfer.\n\n​IMPORTANT NOTE- Free Lunch served at 11:45 LAST-MODIFIED:20150522T152004Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140725T150000Z DTEND:20140725T160000Z DTSTAMP:20260828T094430Z UID:al7gmfg90qg6qe2ocv32jk5d2k@google.com CREATED:20140715T140139Z DESCRIPTION:Speaker: Daniel Kienzler\n\nSpeaker Institution: ETH-Zurich\n\ nTitle: Harmonic oscillator state synthesis by reservoir engineering\n\nAbs tract: I will describe the creation of quantum states of a trapped-ion har monic oscillator by reservoir engineering. This generalizes the standard me thods of sideband cooling [1]\, allowing us to pump the system into quantum superpositions directly with the desired state arising as the dark state o f a dissipative process [2\,3]. The >spin-oscillator coupling Hamiltonians used for the pumping are generalized versions of the Jaynes-Cummings Hamilt onian which act on a basis rotated from the usual energy eigenstates. We ha ve implemented Hamiltonians with coherent and squeezed ground states. Using a spin-motion coupling involving the creation operator for the engineered basis\, we are able to directly transfer state information in this basis in to the spin\, resulting in a significant reduction in measurement overhead. Addtionally I present a new diagnostic technique to directly measure the q uadratures of a squeezed state via the creation of a squeezed Schroedinger cat state.\n\nOur results provide new tools for open-system quantum simulat ions and the characterization of many-body systems of harmonic oscillators\ , such as those found in continuous-variable quantum computation. These tec hniques should facilitate quantum state engineering and measurement in a wi de range of spin-oscillator systems where engineered couplings are availabl e\, including superconducting circuits and nano-mechanics.\n\nHost: Chris M onroe\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ physics.umd.edu/lbk660a75b8jh7e?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.al7gmfg90qg6qe2ocv32jk5d2k&hs=121 LAST-MODIFIED:20140718T195204Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141208T213000Z DTEND:20141208T223000Z DTSTAMP:20260828T094430Z UID:fq5jkvp32dhiqnq4vns8ivvjtg@google.com CREATED:20141013T182727Z DESCRIPTION:Speaker Name: Joel Dahlin\n\nSpeaker Institution : University o f Maryland\n\nTitle: Electron Heating and Acceleration in Collisionless Ma gnetic Reconnection\n\nAbstract: We explore electron acceleration in collis ionless magnetic reconnection via particle-in-cell (PIC) simulations with n on-zero guide fields so that electrons remain magnetized. We address two im portant sources of particle energization: electric fields parallel to the m agnetic field\, and electric fields parallel to the curvature-drift (the la tter associated with acceleration by Fermi reflection). In the case of a sm all guide field (20% of the magnitude of the reconnecting field) the curvat ure drift is the dominant source of electron heating\, while for a larger g uide field (equal to the magnitude of the reconnecting component) the elect ron acceleration by the curvature drift is comparable to that of the parall el electric field. We find that in both simulations\, acceleration at high electron energies is primarily due to the curvature-drift\, which suggests that this mechanism may be more important for the generation of energetic ( nonthermal) electrons. Additionally\, the acceleration due to the curvature -drift occurs over a large area\, whereas the parallel electric field is lo calized near X-lines. This suggests that acceleration by parallel electric fields may play a smaller role in large physical systems\, such as the sola r corona\, where the X-line occupies a vanishing fraction of the system.\n\ nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM\n\n\nJoin with Google Hangouts : https://hangouts.google.com/hangouts/_/physics.umd.edu/space-and?hceid=bG JrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.fq5jkv p32dhiqnq4vns8ivvjtg&hs=121 LAST-MODIFIED:20141203T141427Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160125T210000Z DTEND:20160125T220000Z DTSTAMP:20260828T094430Z UID:2t1bb0ksrht2gq345s0bs34na8@google.com CREATED:20160119T151504Z DESCRIPTION:Speaker Name: Alexander van der Horst\n\nSpeaker Institution : George Washington University\n\nTitle : Hunting for Transients in the Radio Sky\n\nAbstract : While a large fraction of the observable Universe is ste ady and does not change on human timescales\, there are objects displaying variability on timescales of years to days\, to even small fractions of a s econd. These cosmic transients are usually associated with the most extreme phenomena in the Universe like neutron stars\, black holes\, or the format ion of these exotic objects. Their variability can be observed across the e ntire electromagnetic spectrum. Within the multi-wavelength picture\, the r adio regime reveals incoherent synchrotron emission of high-energy particle s moving in the present magnetic fields or coherent radiation from ultra-co mpact structures. In the past\, studies of transients at radio frequencies have mostly been prompted by detections at higher frequencies\, in particul ar because most radio observatories were limited in their field of view and /or sensitivity. This has changed significantly in the last few years: all major radio observatories in ! the world have recently been upgraded or are currently being upgraded\, and several new facilities have been or are bei ng built. This means large improvements in sensitivity\, bandwidth\, and sp atial\, spectral and temporal resolution. Some new observatories explore th e low-frequency radio sky down to tens of MHz with unprecedented sensitivit y. Furthermore\, several new radio facilities have a wide field of view\, p erfectly suited for efficient surveys of the entire sky and searches for tr ansient radio phenomena. In this talk I will discuss the progress that has been made in our understanding of a variety of transients due to radio obse rvations\, discoveries of new phenomena in the radio regime\, and the curre nt efforts and future opportunities in the hunt for radio transients. LAST-MODIFIED:20160119T151826Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140121T160000Z DTEND:20140121T170000Z DTSTAMP:20260828T094430Z UID:2gm5kgt4jkjfsplanbuqqemj44@google.com CLASS:PUBLIC CREATED:20140115T134959Z DESCRIPTION:Speaker: Paul Hess\n\nInstitution: Harvard\n\nTitle:\nProbing p article physics on the tabletop: ACME’s improved limit on the electron’s el ectric dipole moment \n\nAbstract: \nThe Standard Model (SM) of particle ph ysics fails to explain dark matter and the current matter-antimatter asymme try of the universe. Extensions to the SM\, such as weak-scale Supersymmetr y\, may explain these phenomena through the existence of new particles and interactions that are asymmetric under time-reversal (T). These theories ne arly always predict an electron electric dipole moment (EDM)\, a T-violatin g asymmetric charge distribution along the electron’s spin. The ACME collab oration has set a new EDM limit using a molecular beam of the polar molecul e thorium monoxide (ThO). In particular\, I will discuss spectroscopic meas urements of our electric fields which allowed us to reduce the effects of a potentially harmful systematic. \n\nHost: Chris Monroe LAST-MODIFIED:20140115T134959Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150514T180000Z DTEND:20150514T193000Z DTSTAMP:20260828T094430Z UID:mlc9vl1gjgqceva6bgj8njf5ho@google.com CREATED:20150126T224733Z DESCRIPTION:Speaker Name: Prof. Bharat Jalan\n\nSpeaker Institution: U. Min nesota \n\nTitle: New Insights and Opportunities at the MBE-Grown Complex Oxides\nHeterostructures\n\nAbstract:Complex oxide heterostructures can sho w strong correlation effects\, novel magnetism\, high breakdown voltage\, a nd high 2D electron density (of the order of 1014 cm-2)\,unattainable in tr aditional semiconductor heterostructures. High 2D electron densities areof particular interest for studying low-dimensional physics in narrow d-band m aterials\, inaddition to fabricating novel plasmonic field-effect devices ( FETs). In this talk\, I will present that 2D carrier density much higher th an expected based on resolution of the\npolar discontinuity at perovskite o xide heterojunctions can be achieved via internal\ncharge transfer using ba nd-engineering approaches. Combining DFT modeling and\nexperiments using x- ray photoelectron spectroscopy\, scanning transmission electron\nmicroscopy \, electron energy loss spectroscopy\, energy dispersive x-ray spectroscopy and\nelectronic transport measurements\, I will discuss the origin of thes e carriers\,\ndimensionality and transport mechanisms. Finally\, I will dis cuss how electron and hole\ndoping via band-engineered approaches may provi de an exceptional route to revisit the\nphase diagrams of transition metal oxides in the “clean” doping limit.\n\nHost: James Williams LAST-MODIFIED:20150507T145158Z LOCATION:Phys rm 1201\; John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130408T154500Z DTEND:20130408T163000Z DTSTAMP:20260828T094430Z UID:1lv88pchb6ldd7hjhjstpjg3uo@google.com CREATED:20130116T182147Z LAST-MODIFIED:20130116T182156Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141006T200000Z DTEND:20141006T210000Z DTSTAMP:20260828T094430Z UID:i7v4oe613o6p6r2qt9u26au2us@google.com CREATED:20140922T154434Z DESCRIPTION:Speaker Name: Enrico Gratton\n\nSpeaker Institution : Laborator y for Fluorescence Dynamics\, University of California\, Irvine\n\nTitle: Laboratory for Fluorescence Dynamics\, University of California\, Irvine\n\ nAbstract : The coordination of cell functions requires that molecules move in the cell interior to find their partners and eventually to form complex es. In the cell interior\, the mechanisms for molecular motion are poorly understood. While in an isotropic fluid diffusion is the default mechanism of motion\, in the cell interior diffusion is hindered by barriers and by transient binding. Also molecules can move by active transport. One unive rsal transport processes which is still debated is the shuttling of molecul es between the cytoplasm and the nucleus. It is well established that mole cules must pass through the nuclear pore complexes to go from the cytoplasm to the nucleus. The structure of the nuclear pore complex has been elucid ated. The nuclear pore has the additional capability to selectively allow specific molecules to be transported between the cytoplasm and the nucleus. Despite many years of research\, the physical mechanism responsible for th e nuclear transport and pore selectivity remains elusive.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koa ks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLm NvbQ.i7v4oe613o6p6r2qt9u26au2us&hs=121 LAST-MODIFIED:20140922T154546Z LOCATION:0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160408T161000Z DTEND:20160408T171000Z DTSTAMP:20260828T094430Z UID:c7lj1c25arp18fdm0psar5geok@google.com CLASS:PUBLIC CREATED:20160401T150525Z DESCRIPTION:Speaker: Dr. Hirokazu Miyake\, JQI\n\n(Free lunch served at 12: 00)\n\nTitle: Topological Physics with Atoms and Photons\n\nAbstract: Ideas from topology have generated a lot of excitement in the fields of condense d matter\, cold atoms\, and photonics because they can give rise to intrigu ing phenomena such as backscattering-free edge states and fractional quantu m Hall states. Cold atoms and photonics are particularly well-suited to rea lize non-trivial topological states because of the flexibility they offer: cold atoms can take advantage of the precise measurement and control techni ques developed in atomic physics\, and photonics can take advantage of the precise nanofabrication techniques developed by the semiconductor industry. \n\nIn this talk\, I will discuss the recent experimental realization with ultracold atoms of the Harper-Hofstadter Hamiltonian\, a model describing t he motion of electrons on a lattice in the presence of a strong magnetic fi eld and which gives rise to non-trivial band topologies. Then I will descri be on-going work at JQI to experimentally realize topological photonic crys tals with the goal of studying interactions of topological light with quant um emitters in a solid-state\, chip-scale system. LAST-MODIFIED:20160401T150525Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160223T181500Z DTEND:20160223T193000Z DTSTAMP:20260828T094430Z UID:8landngnprgl4741bp7k2q5lp4@google.com CREATED:20160219T140629Z DESCRIPTION:Speaker Name: Oren Raz\n\nSpeaker Institution : University of M aryland\, College Park\n\nTitle : Controlling the power and efficiency of g eometrical heat engines\n\nAbstract : Thermodynamics places a limit on the efficiency of heat engines\, but not on their output power or how the power and efficiency change with the engine's cycle time. In this talk\, I will present a geometrical description of the power and efficiency as a function of the cycle time\, applicable to a useful class of heat engine models. Th is geometrical description is used to design engine protocols that attain b oth the maximal power and maximal efficiency at the fast driving limit. Fur thermore\, using this method we also prove that no protocol can attain exac tly the Carnot efficiency with non-zero power. LAST-MODIFIED:20160219T140629Z LOCATION:IPST Building Room 116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141030T180000Z DTEND:20141030T193000Z DTSTAMP:20260828T094430Z UID:18kb3k28ep7q6nv9d3e7f0rl1k@google.com CREATED:20140828T215410Z DESCRIPTION:Speaker Name: Michael Lilly\n\nSpeaker Institution: Sandia Na tional Lab\n\nTitle: Electron spin qubits using donors in silicon\n\nAbstr act: Semiconductor nanoelectronic devices can be combined\, or integrated\ , in a variety of ways to control a single electron and form a qubit. We h ave focused on silicon devices where the electron is confined on a single d onor atom and its spin forms the qubit. Pulsed gate techniques allow spin readout for a single electron. At the end of the readout pulse\, the elect ron is initialized to spin down. We demonstrate spin control by applying p ulsed microwaves to coherently rotate the electron spin. Using these techn iques\, we have measured long spin lifetimes\, measured single shot spin re adout and recently observed coherent oscillations of a single electron spin . Devices for moving to two-qubits will be discussed at the end of the tal k.\n\nSandia National Laboratories is a multi-program laboratory managed an d operated by Sandia Corporation\, a wholly owned subsidiary of Lockheed Ma rtin Corporation\, for the U.S. Department of Energy's National Nuclear Sec urity Administration under contract DE-AC04-94AL85000.\n\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/cnam-con densed?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.18kb3k28ep7q6nv9d3e7f0rl1k&hs=121 LAST-MODIFIED:20141024T171312Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141112T203000Z DTEND:20141112T213000Z DTSTAMP:20260828T094430Z UID:2skh6o88gstmdptv11nnbsja44@google.com CREATED:20141107T145458Z DESCRIPTION:Speaker Name: Dr. Thomas Murphy\n\nSpeaker Institution : UMCP\n \nTitle: Symmetries\, Clusters\, and Synchronization Patterns in Complex N etworks\n\nAbstract : Synchronization is of central importance in power dis tribution\, telecommunication\, neuronal\, and biological networks. Many n etworks are observed to produce patterns of synchronized clusters\, but it has been difficult to predict these clusters or understand the conditions f or formation. Here\, we show the intimate connection between network symme try and cluster synchronization. We employ computational group theory to r eveal the clusters and determine their stability. The connection between s ymmetry and cluster synchronization is explored using an electro-optic netw ork. We observe and explain a surprising phenomenon in which some clusters lose synchrony while leaving others synchronized. The results could guide the design of new power grid systems or lead to new understanding of the d ynamical behavior of networks ranging from neural to social\n\n\n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/l ab-for?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.2skh6o88gstmdptv11nnbsja44&hs=121 LAST-MODIFIED:20141107T145458Z LOCATION:Lab for Physical Sciences\, downstairs SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141114T174500Z DTEND:20141114T181500Z DTSTAMP:20260828T094430Z UID:aoa17a8d14ogajl2hqrigp8n08@google.com CREATED:20141111T161741Z DESCRIPTION:Speaker Name: Sunil Mittal\n\nSpeaker Institution: University o f Maryland\n\nTitle: Topological Edge States in Silicon Photonics\n\nAbstr act: Under the influence of a magnetic field\, at low temperatures\, charg ed particles confined in two-dimensional systems exhibit a remarkable range of macroscopic quantum phenomena such as the quantum Hall effects. A hallm ark of these phenomena is the presence of unidirectional\, topologically ro bust edge states - states which are confined to the edge of the system.\n\n We implement a synthetic magnetic field for photons and demonstrate the pre sence of topologically robust edge states\, on a silicon photonics platform . Using transport statistics\, we show that disorder induced localization i s suppressed in edge states.\n\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.aoa17a8d14ogajl2hqrigp8n08 &hs=121 LAST-MODIFIED:20141112T203927Z LOCATION:PSC 2136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI Friday Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140916T200000Z DTEND:20140916T210000Z DTSTAMP:20260828T094430Z UID:47rc1430dvguckk3tjr8fj1jfk@google.com CREATED:20140718T143007Z DESCRIPTION:Speaker Name: Mark Dykman\n\nSpeaker Institution: Michigan St ate University (East Lansing)\n\nTitle: Mesoscopic oscillators: quantum act ivation\, quantum measurements\, quantum heating\n\nAbstract: Nonlinear vi brations are attracting interest in many areas\, from nanomechanics to cavi ty quantum electrodynamics to Josephson junction based systems. Besides var ious applications\, they allow one to address a general problem of quantum fluctuations in systems away from thermal equilibrium. We will show that th ese fluctuations display unusual features\, including the mechanism of swit ching between coexisting stable periodic states that has no analog in equil ibrium systems. We call it quantum activation. The scaling behavior of the switching rates will be outlined and a comparison with the experiment will be made. The effect of fragility of the rates of rare events in nonequilibr ium systems will be also discussed.\n\n\n\nJoin with Google Hangouts: https ://hangouts.google.com/hangouts/_/physics.umd.edu/physics?hceid=bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.47rc1430dvguckk 3tjr8fj1jfk&hs=121 LAST-MODIFIED:20140910T130504Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140918T163000Z DTEND:20140918T173000Z DTSTAMP:20260828T094430Z UID:opj9aod88ddah03tv46qdl3qlo@google.com CREATED:20140911T181218Z DESCRIPTION:Speaker Name: Keith Burghardt\n\nSpeaker Institution : Universi ty of Maryland\n\nTitle: Connecting data with competing opinion models\n\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.opj9aod88ddah03tv46qdl3qlo&hs=121 LAST-MODIFIED:20140917T204529Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150218T203000Z DTEND:20150218T213000Z DTSTAMP:20260828T094430Z UID:oddfv2u8pd47b49bra8odj5a80@google.com CREATED:20150212T152038Z DESCRIPTION:Speaker Name: Dr. Christopher C. Davis\n\nSpeaker Institution: UMCP\n\nTitle: Is the Radiation from Your Cell Phone a Health Hazard? Risk vs. Reality\n\nAbstract: Despite an overwhelming preponderance of evidence to the contrary\, there continues to be some public concern that human expo sure to radio frequency (RF) radiation from cell phones\, base stations\, a nd other wireless devices\, even at relatively low levels\, can constitute a health hazard. The media seize on any report of a possible health risk ba sed on occasional reports of biological effects being produced by RF radiat ion\, but ignore the much larger number of studies that find nothing. This talk will review the science underlying our understanding of how RF radiati on can interact with biological systems and discuss why public concern abou t the health risk from cell phones and base stations is irrational. Some of the problems associated with supposed positive findings of biological effe cts from low level non-ionizing radiation will be discussed. The claimed co nnection between cell phone use and cancer will be examined\, and some of t he legal cases that have kept the cell phone health controversy alive. A sp ecific interaction mechanism that will be discussed is the possibility of n onlinearity in cells and tissue that might demodulate an RF carrier.\n\nFor guests attending the LPS seminar\, please use the phone on the left hand s ide of the front door to call the receptionist for entry. LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts.\n\n\n\n\n LAST-MODIFIED:20150218T160026Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150504T190000Z DTEND:20150504T200000Z DTSTAMP:20260828T094430Z UID:2jhejt6hmqp5176ivv0a4aqpoo@google.com CLASS:PUBLIC CREATED:20150416T182007Z DESCRIPTION:Speaker Name: Beni Yoshida \n\nSpeaker Institute: Caltech\n\nT itle: Topological color code and SPT phases\n\nAbstract: We study (d−1)-dim ensional excitations in the d-dimensional color code that are created by tr ansversal application of the R_d phase operators on connected subregions of qubits. We find that such excitations are superpositions of electric charg es and can be characterized by fixed-point wavefunctions of (d−1) dimension al bosonic SPT phases with (Z_2)^(\\otimes d) symmetry. While these SPT exc itations are localized on (d−1)-dimensional boundaries\, their creation req uires operations acting on all qubits inside the boundaries\, reflecting th e non-triviality of emerging SPT wavefunctions. Moreover\, these SPT-excita tions can be physically realized as transparent gapped domain walls which e xchange excitations in the color code. Namely\, in the three-dimensional co lor code\, the domain wall\, associated with the transversal R_3 operator\, exchanges a magnetic flux and a composite of a magnetic flux and loop-like SPT excitation\, revealing rich possibilities of boundaries in higher-dime nsional TQFTs. We also find that magnetic fluxes and loop-like SPT excitati ons exhibit non-trivial three-loop braiding statistics in three dimensions as a result of the fact that the R_3 phase operator belongs to the third-le vel of the Clifford hierarchy. We believe that the connection between SPT e xcitations\, fault-tolerant logical gates and gapped domain walls\, establi shed in this paper\, can be generalized to a large class of topological qua ntum codes and TQFTs.\n\nReference: arXiv:1503.07208 LAST-MODIFIED:20150501T190008Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150406T200000Z DTEND:20150406T210000Z DTSTAMP:20260828T094430Z UID:cnmnq7e00igfr5tocnf10v66u0@google.com CREATED:20150304T180828Z DESCRIPTION:Speaker Name: Kimberly Stoka\n\nSpeaker Institution : Universit y of Maryland\n\nTitle : Joining Forces with Biology: Bioengineering Perspe ctives on Tumor Cell Migration\n\nAbstract : Cell homeostasis and diverse p rocesses\, including migration\, are tightly regulated by cell volume. In v ivo\, metastatic tumor cells must navigate complex\, heterogeneous microenv ironments when migrating through tissues\, including longitudinal tracks fo rmed by anatomic structures. Intriguingly\, we have discovered that the cla ssical model of cell migration on two-dimensional substrates (relying on ac tin polymerization\, cell adhesion to the substrate\, and myosin II-mediate d contractility) does not apply to metastatic tumor cells migrating through three-dimensional confined spaces. We therefore hypothesized that an alter nate mechanism based on cell volume regulation via ion channels and aquapor ins drives cell migration in these confined microenvironments\, where cells must deform in order to squeeze through physically restrictive spaces. Usi ng a multidisciplinary approach that integrates microfabrication techniques \, molecular biology\, live cell imaging\, and theoretical modeling based o n physics\, we have developed an “Osmotic Engine Model” of cell migration\, which demonstrates that osmotically-driven water flow regulates cell migra tion in confined microenvironments. Importantly\, our theoretical model pre dicts many key non-intuitive experimental results. Collectively\, this stud y represents a new paradigm for cell migration in confined microenvironment s and elucidates ion pumps and aquaporins as new molecular targets that may be exploited for future development of cancer therapeutics. LAST-MODIFIED:20150304T181414Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140715T143000Z DTEND:20140715T153000Z DTSTAMP:20260828T094430Z UID:p39g6fv8jgsetpipgtcm8rco54@google.com CREATED:20140714T152943Z DESCRIPTION:Speaker: Adrien Signoles\, ENS\, Paris\n\nTitle: Quantum Zeno D ynamics of a Rydberg atom\n\nAbstract: QZD allows one to tailor dynamically at will a system's Hilbert space. Recent proposals\, particularly in the C avity Quantum Electrodynamics (CQED) context\, highlight the interest of QZ D for quantum state engineering tasks.\nIn this talk I will report the obse rvation of QZD in the 51-dimension Hilbert space of a large angular momentu m J = 25. Continuous selective interrogation limits the evolution of this a ngular momentum to an adjustable multi-dimensional subspace. This confined dynamics leads to the production of non-classical 'Schrödinger cat' states\ , quantum superposition of angular momentums pointing in different directio ns.\n\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.p39g6fv8jgsetpipgtcm8rco54&hs=121 LAST-MODIFIED:20140714T152943Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141027T150000Z DTEND:20141027T160000Z DTSTAMP:20260828T094430Z UID:6pir36enun6gffoe1n2astg5is@google.com CREATED:20140711T172041Z DESCRIPTION:Speaker Name: Donhee Ham\n\nSpeaker Institution: Harvard\n\nTit le: Manipulating light with mass of massless graphene electrons +\n\nAbstr act: While one of the most celebrated physics of graphene is the behavior of its individual electrons as massless relativistic particles\, they do ex hibit mass when they move together\, which is at the heart of graphene plas monics. I will discuss our recent measurement of this mass of massless grap hene electrons\, and its application in ultra-subwavelength plasmonic devic es at THz frequencies. And on a different topic\, I will introduce our prog ram for biomolecular NMR. NMR spectroscopy is one of the most powerful bio- analytical tools with its ability to elucidate 3D structure & function of b io molecules. Particularly\, its use in structural biology and pharmaceutic al screening has proven enormously fruitful. But it is inherently too slow while the workload of modern biology & medicine continues to increase. I wi ll discuss our biomolecular NMR work using silicon chips and our vision to enable high-throughput biomolecular NMR.\nHost: James Williams\n\n\nJoin wi th Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ 29vZ2xlLmNvbQ.6pir36enun6gffoe1n2astg5is&hs=121 LAST-MODIFIED:20141020T204635Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141124T160000Z DTEND:20141124T170000Z DTSTAMP:20260828T094430Z UID:1m16hsod9ig4cld8de33h176pg@google.com CREATED:20140711T172938Z DESCRIPTION:Speaker Name: Ivan Deutsch\n\nSpeaker Institution: University of New Mexico\n\nTitle: Control and Measurement of Atomic Spins: A Testbed for Quantum Information Processing\n\nAbstract: Atomic spins provide a ne arly ideal testbed for exploring protocols in quantum control and measureme nt\, with applications in quantum information processing. Working in colla boration with the experimental group of Poul Jessen at the University of Ar izona\, Tucson\, we have developed a platform for carrying this out based o n laser-cooled gases of cesium atoms\, controlled and measured with magneto -optical fields. In this talk I will present our recent progress\, includi ng optimal control to implement arbitrary unitary transformations in SU(16) and compressed sensing state/process tomography. We can extend these tool s to control and measure large atomic ensembles\, where light acts as a qua ntum databus for entangling atoms with one another. I will show how intern al atomic state control can be used to strongly enhance the atom-photon ent anglement and reach increasingly nonclassical regimes.\n\nHost: Luis Orozco \n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/p hysics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdX AuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.1m16hsod9ig4cld8de33h176pg&hs=121 LAST-MODIFIED:20141112T194459Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140430T153000Z DTEND:20140430T170000Z DTSTAMP:20260828T094430Z UID:980u5e87d7j0ojhbf0v1ra360s@google.com CREATED:20140225T170328Z DESCRIPTION:**NOTICE: This events has been cancelled.**\n\nTitle: Non-pertu rbative renormalization of twist-2 matrix elements\n\nSpeaker: Kostas Orgin os\, College of William & Mary\n\nAbstract: The moments of structure functi ons of the proton can be calculated non-perturbatively in lattice QCD. Howe ver\, the lattice regulator breaks rotational symmetry resulting in power d ivergent mixing to spoils the continuum limit of the relevant matrix elemen ts when evaluating them on the lattice.\nSuch power divergent mixings requi re non-perturbative subtraction. In addition a complete non-perturbative c omputation of these matrix elements requires non-perturbative renormalizati on. \nIn this talk\, I present a new approach for determining non-perturba tively the power divergent mixings well the renormalization constants of tw ist-2\nmatrix elements. Such approach has the potential of allowing for mor e precise computations of larger number of moments than currently possible. LAST-MODIFIED:20140429T204920Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Cancelled** Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141008T200000Z DTEND:20141008T213000Z DTSTAMP:20260828T094430Z UID:mpoir72fg5t87638asj1cm0i0s@google.com CREATED:20141003T153841Z DESCRIPTION:Speaker Name: Shmuel Nussinov\n\nSpeaker Institution : Universi ty of Maryland\n\nTitle: Would the LHC Produce Technologically Useful Part icles? Yes\, It Would if it Only Could\n\nAbstract: We point out that if an extreme variant of "Quirks"\, particles that carry ordinary color and some other color' exist\, then we can have a completely novel and efficient mod e of long distance communications. From very low scale Lambda' and associa ted string tension of the new color' the Quirks can be captured in ordinary materials. Having then the Quirk Q' and anti-Quirk ~Q' in two separate pi ezoelectric crystals at two arbitrarily far out points A and B allows Alice and Bob at these locations to communicate by generating transverse waves a long the color' string connecting them.\n\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/high-energy?hceid=bGJrN jYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mpoir72fg 5t87638asj1cm0i0s&hs=121 LAST-MODIFIED:20141003T153841Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20150831T110000 DTEND;TZID=America/New_York:20150831T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20150831T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker: David Huse\, Princeton University.\n\nTitle: Quantum thermalization and many-body Anderson localization.\n\nAbstract: Progress in physics and quantum information science motivates much recent study of the behavior of extensively-entangled many-body quantum systems fully isola ted from their environment\, and thus undergoing unitary time evolution. W hat does it mean for such a system to go to thermal equilibrium? I will ex plain the Eigenstate Thermalization Hypothesis (ETH)\, which posits that ea ch individual exact eigenstate of the system's Hamiltonian is at thermal eq uilibrium\, and which appears to be true for many (but not all) quantum man y-body systems. Prominent among the systems that do not obey this hypothes is are quantum systems that are many-body Anderson localized and thus do no t constitute a reservoir that can thermalize itself. When the ETH is true\ , one can do standard statistical mechanics using the "single-eigenstate en sembles"\, which are the limit of the microcanonical ensemble where the "en ergy window" contains only a single many-body eigenstate. These eigenstate ensembles are more powerful than the traditional statistical mechanical en sembles\, in that they can also "see" the novel quantum phase transition in to the many-body localized phase\, as well as a rich new world of phases a nd quantum phase transitions within the many-body localized phase.\n LAST-MODIFIED:20150708T144632Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151015T170000Z DTEND:20151015T180000Z DTSTAMP:20260828T094430Z UID:82tk7slgiiher70ar1v85lgnf4@google.com CLASS:PUBLIC CREATED:20151012T153436Z DESCRIPTION:Nicolai Nygaard\; DONG Energy\n\nTitle: From atoms to wind turb ines\n\nAbstract: Wind power has been harnessed for commercial electricity generation for more than three decades. Notwithstanding its maturity\, the wind energy industry is still evolving. Wind turbines are steadily growing in size and complexity\, and wind power plants are constructed on an ever-i ncreasing scale especially offshore. As the industry continues to push the technological boundaries\, new scientific and engineering challenges are un covered. \n\nIn this presentation\, I will give an account of my personal transition from theoretical atomic physics to industrial R&D for an offshor e wind farm developer and operator. The talk will explain the fundamental p hysics of wind energy and give examples of my work experiences. \n\n \n\nNi colai Nygaard received the Ph.D. in Chemical Physics from the\nUniversity o f Maryland in 2003\, for his thesis “Superfluidity in a\ndegenerate atomic Fermi gas\,” LAST-MODIFIED:20151013T144652Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Professional Development Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141210T180000Z DTEND:20141210T193000Z DTSTAMP:20260828T094430Z UID:uvksllf5ktbbaou3lqb1udp514@google.com CREATED:20140926T194616Z DESCRIPTION:Title: T-reflections and vacuum energies\n\nSpeaker: David McGa dy\, Princeton\n\nAbstract: I will discuss the presence of a previously unr ecognized +T -> -T temperature-reflection (T-reflection) symmetry for the p artition functions of a number of physically interesting quantum theories. Enforcing T-reflection symmetry on these systems uniquely fixes their groun d-state energy. T-reflection symmetry is present in a wide variety of quant um systems\, which range from interacting conformal field theories to free massive quantum field theories and infinite N gauge theories on S^3 times S ^1. Shockingly\, T-reflection symmetry for infinite N gauge theories on S^3 \\times S^1 predictions that their renormalized infinite N Casimir energie s vanish. We close with a discussion of our current understanding of the un derlying physical principles behind T-reflections.\n\nJoin with Google Hang outs: https://hangouts.google.com/hangouts/_/physics.umd.edu/nuclear-physic s?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmN vbQ.uvksllf5ktbbaou3lqb1udp514&hs=121 LAST-MODIFIED:20141208T213558Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150413T200000Z DTEND:20150413T210000Z DTSTAMP:20260828T094430Z UID:nimmfleqgfb1jc2a88qp3jkois@google.com CREATED:20150304T182047Z DESCRIPTION:Speaker Name: John MCracken\n\nSpeaker Institution : Michigan S tate University\n\nTitle: Probing Coordination Chemistry at the Non-Heme I ron Active Site of Tyrosine Hydroxylase\n\nAbstract: Tyrosine hydroxylase makes use a mononuclear non-heme Fe center to catalyze the hydroxylation of L-tyrosine to produce L-3\,4-dihydroxy phenylalanine (L-DOPA)\, the rate l imiting step in the biosynthesis of the catecholamine neurotransmitters. Th e enzyme is catalytically active in the ferrous oxidation state and is high spin. To render the catalytic site EPR active\, we have used nitric oxide (NO) as a surrogate for substrate O2 to form an S=3/2 paramagnetic center. While the continuous wave (cw) - EPR spectra of NO-enzyme adducts are rathe r generic\, they provide electron spin echo envelope modulation (ESEEM) dat a that are rich with structural information derived from ligand hyperfine c ouplings. This talk will focus on the application of 2H-ESEEM spectroscopy and Hyperfine Sublevel Correlation (HYSCORE) spectroscopy\, to assign these spectra and harvest the unique information on Fe(II) coordination chemistr y that they provide.\n\n\n LAST-MODIFIED:20150410T194904Z LOCATION:0112 Chemistry Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140424T173000Z DTEND:20140424T183000Z DTSTAMP:20260828T094430Z UID:l1o6s5shjra1nur0k4bguoo3tc@google.com CREATED:20140122T205930Z DESCRIPTION:Title: Electromagnetic form factors of the octet baryons from l attice QCD\n\nSpeaker: Phiala Shanahan\, Adelaide\n\nAbstract: I will prese nt the results of recent lattice simulations of the electromagnetic form fa ctors of the octet baryons from the CSSM/QCDSF/UKQCD collaborations. The fo cus will be on the analysis of those results using techniques to approach t he infinite volume limit and the physical pseudoscalar masses at non-zero m omentum transfer. The extrapolated proton and neutron form factors are foun d to be in excellent agreement with those extracted from experiment. Given the success of these calculations\, I will describe how the strange electro magnetic form factors may be estimated from these results under the same as sumption of charge symmetry used in experimental determinations of those qu antities. Motivated by the necessity of that assumption\, I will explore a method for determining the size of charge symmetry breaking effects using t he same lattice results discussed previously. LAST-MODIFIED:20140409T173309Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140501T190000Z DTEND:20140501T200000Z DTSTAMP:20260828T094430Z UID:4nnrdkip4eeobqirsoehs0eiuc@google.com CREATED:20140423T175031Z DESCRIPTION:Speaker: Jim Gates (UMCP)\nAbstract: An introduction to adinkra s\, which are a graphical representation of supersymmetry representations w ith 1-dimensional spacetime. LAST-MODIFIED:20140423T175031Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Adinkras\, Part 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150515T190000Z DTEND:20150515T203000Z DTSTAMP:20260828T094430Z UID:siift2r5s5bsu9mjeoeurk7ak8@google.com CREATED:20150512T170619Z DESCRIPTION:Speaker Name: Andrew Dzurak \n\nSpeaker Institution: UNSW\, Sch ool of Electrical Engineering\, Sydney\, Australia\n\nTitle: Spin-based Qua ntum Computing in Silicon\n\nAbstract: Spin qubits in silicon are excellent candidates for scalable quantum information processing [1] due to their lo ng coherence times and the enormous investment in silicon MOS technology. I will discuss qubits based upon the electron and nuclear spins associated w ith single phosphorus (P) dopant atoms in silicon [2-5] and also more recen t work based upon electron spins confined in Si-MOS quantum dots [6-9]. In each case\, single-shot electron spin readout is performed using an adjacen t single electron transistor and the process of spin-to-charge conversion\, showing spin lifetimes of order seconds [2\, 7] for the electrons and many minutes for the nuclear spins [4]. Control of individual electron and nucl ear spins is achieved by spin resonance using an on-chip microwave transmis sion line [3]. \nIn isotopically enriched Si-28 all of these spin qubits sh ow control fidelities FC above 99%\, consistent with some fault-tolerant QC error correction codes. Specifically the P donor electron spin qubit has F Ce > 99.6% [5]\, the 31P nuclear spin qubit has FCn > 99.99% [5]\, and the Si-MOS quantum dot electron spin qubit has FCe > 99.6% [8]. Using dynamical decoupling sequences the coherence times for the P atom qubits can reach T 2eCPMG = 0.5 s for the electron and T2nCPMG = 30 s for the nuclear spin.\nI n the SiMOS quantum dot qubits the electron g*-factor can be tuned using a gate voltage\, leading to a Stark shift in the qubit operation frequency of > 10 MHz [8]\, allowing individual addressability of many qubits. Most rec ently we have demonstrated the exchange coupling of two SiMOS qubits to rea lize CNOT gates [9] for which over 100 two-qubit gates can be performed wit hin a coherence time of 8 μs. \n\n[1] D.D. Awschalom et al.\, “Quantum Spin tronics”\, Science 339\, 1174 (2013).\n[2] A. Morello et al.\, “Single-shot readout of an electron spin in silicon”\, Nature 467\, 687 (2010).\n[3] J. J. Pla et al.\, “A single-atom electron spin qubit in silicon”\, Nature 489 \, 541 (2012).\n[4] J.J. Pla et al.\, “High-fidelity readout and control of a nuclear spin qubit in Si”\, Nature 496\, 334 (2013).\n[5] J.T. Muhonen e t al.\, “Storing quantum information for 30 seconds in a nanoelectronic dev ice”\, Nature Nanotechnology 9\, 986 (2014).\n[6]S.J. Angus et al.\, “Gate- defined quantum dots in intrinsic silicon”\, Nano Lett. 7\, 2051 (2007).\n[ 7]C.H. Yang et al.\, “Spin-valley lifetimes in a silicon quantum dot with t unable valley splitting”\, Nature Communications 4\, 2069 (2013).\n[8]M. Ve ldhorst et al.\, “An addressable quantum dot qubit with fault-tolerant cont rol fidelity”\, Nature Nanotechnology 9\, 981 (2014).\n[9]M. Veldhorst et a l.\, “A two-qubit logic gate in silicon”\, arXiv:1411.5760.\n\n\nHost: Ed B arnes\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150512T175309Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint CMTC/JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150916T180000Z DTEND:20150916T193000Z DTSTAMP:20260828T094430Z UID:opmj928ne5m6d6g3jvqm01ka00@google.com CREATED:20150904T131624Z DESCRIPTION:Speaker: Jim Isenberg\n\nSpeaker Institution: University of Ore gon\n\nTitle: Primer on Cosmic Censorship LAST-MODIFIED:20150904T131624Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141001T193000Z DTEND:20141001T203000Z DTSTAMP:20260828T094430Z UID:djbbil3cud9b1n0dnqd4p0tesc@google.com CREATED:20140925T164108Z DESCRIPTION:Speaker Name: Dr. Lara Faoro\n\nSpeaker Institution: Rutgers\n\ nTitle: Generalized Tunneling Model (GTM) for Two Level System (TLS) in amo rphous materials and its predictions for their dephasing and the noise in s uperconducting microresonators\n\n \nAbstract : Thin film high quality supe rconductor microresonators are important for a number of diverse applicatio ns that range from quantum computation to submillimeter and far-infrared as tronomy. The performance of these devices has improved dramatically over th e past decades and resonator quality factors above 10^6 are now routinely a chieved using single-layer structures deposited on high-quality low-loss cr ystalline substrate. Achieving high-quality factors requires minimizing all potential sources of dissipation and noise. One prominent source of dissip ation in microresonators has been found to be Two Level Systems (TLSs) in t hin amorphous dielectric surface layers of the microresonators. These TLS a re also responsible for an excess frequency noise (jitter) in the resonator s. TLS in amorphous materials are usually described by the Standard Tunneli ng Model (STM). In this theory\, TLS are represented as independent quantum two level systems with constant distribution of low energy states. Unfortu nately\, STM fails to explain the data of noise in the superconducting micr oresonators so a consistent model for the noise due to TLS in superconducti ng resonators remains an open issue.\n\n In this talk we shall fir st review data of recent experiments performed on high quality superconduct ing microresonator where low frequency noise spectra have been studied in v arying temperature and different applied power and argue that the data are inconsistent with the STM. We shall then propose a new model\, the Generali zed Tunneling Model (GTM) which includes strong interactions between TLS an d a slow power law dependence of their density of states. We show that the predictions of this model are in a perfect agreement with the recent studie s of the noise in high quality superconducting resonators. The predictions also agree with the temperature dependence of the TLS dephasing rates obser ved in phase qubits. Finally\, we discuss the origin of the universal dime nsionless parameter that controls the interaction between TLS in glasses an d show that it is consistent with the assumptions of the GTM.\n\n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/l ps-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ2 9vZ2xlLmNvbQ.djbbil3cud9b1n0dnqd4p0tesc&hs=121 LAST-MODIFIED:20140925T170030Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141120T190000Z DTEND:20141120T200000Z DTSTAMP:20260828T094430Z UID:qqbsll4qa6odaft7076ibljagk@google.com CREATED:20141030T162546Z DESCRIPTION:Speaker Name: Andrea Damascelli\n\nSpeaker Institution: Unive rsity of British Columbia\n\nTitle: Charge order in cuprates: from hole to electron doping\n\nAbstract: Charge ordering has recently resurged as a p rominent phenomenon in the physics of copper-oxide high-temperature superco nductors. In this talk I will review our recent results from Bi2201 and YBC O hole-doped cuprates\, as well as electron doped NCCO. Following the early discoveries of stripe-like order in La-based cuprates\, this establishes c harge ordering instabilities to be omnipresent in all cuprate families. I w ill discuss the connection between charge ordering and pseudogap phenomenol ogy\, similarities and asymmetries between hole and electron doping\, and t he native local symmetry of charge modulations.\n\nHost: Prof. Johnpierre Paglione\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/cnam-colloquium?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZT BAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.qqbsll4qa6odaft7076ibljagk&hs=121 LAST-MODIFIED:20141118T202402Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160420T200000Z DTEND:20160420T210000Z DTSTAMP:20260828T094430Z UID:aehks6ed09h83nrgo4t3borp54@google.com CREATED:20160330T182846Z DESCRIPTION:Speaker Name: Dov Rhodes\n\nSpeaker Institution : Columbia Univ ersity\n\nTitle : Exploring Alternate Ordering of the MHD Stability Limits for Coupled Tearing-Wall Modes\n\nAbstract : Tokamak operation relies on a proper understanding of the stability limits. The Brennan-Finn study of res istive-MHD modes [1] optimizes feedback control in different plasma respons e regimes. The regimes are divided by resistive or ideal plasma (rp or ip) with resistive or ideal wall (rw or iw)\, satisfying the beta-limit orderin g rp-rw zed near an optimal Gi that effectively cancels the plasma rotation (with respect to the wall). A new phase-matching feedback experiment of HB T-EP yields similar results [3]. The present work explores conditions for a n alternate beta-limit ordering rp-rw ternately\, the ip-rw limit may be lo wered by toroidal mode-coupling. This destabilizing effect is studied in a first-order toroidal extension of the Brennan-Finn reduced-MHD model [1] an d compared with a fully toroidal multi-mode sharp-boundary model based on F itzpatrick [2]. Initial studies find the alternate beta-limit ordering to e xist in a finite domain of the safety factor q. Gi! ven the Brennan-Finn mo del predictions\, this finding suggests that toroidal coupling may permit r otation-like feedback stabilization above the ip-rw beta- limit\, and possi bly even rotation-canceling feedback stabilization up to the ip-iw limit. [ 1] D.P. Brennan and J.M. Finn\, Phys. Plasmas 21\, (2014). [2] R. Fitzpatri ck\, Phys. Plasmas 17\, (2010). [3] Q. Peng et. al.\, Plasma Phys. Control. Fusion 58\, (2016). LAST-MODIFIED:20160330T182846Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150406T200000Z DTEND:20150406T210000Z DTSTAMP:20260828T094430Z UID:5ors6lp6j20t2qbopl6b05c1v0@google.com CREATED:20150330T183018Z DESCRIPTION:**This event has been cancelled.**\n\nRefreshments available at 3:30 pm\n\nSpeaker: Jonathan McKinney \n\nSpeaker Institution: UMD\n\nTitl e: Growing Black Holes via Super-Eddington Accretion\n\nAbstract: Black hol e engines power phenomena from the large-scale heating of gas in galaxies a nd clusters down to the event horizon-scale formation of relativistic jets. We reveal how our unique state-of-the-art general relativistic radiation m agnetohydrodynamical simulations of accreting black holes and their feedbac k (as radiation\, winds\, and jets) could help solve the problem of the rap id formation of high redshift quasars and might explain the origin of the b lack-hole-mass to bulge-velocity-dispersion (M-sigma) correlation in galaxi es. Radiation physics in simulations will provide a fresh understanding of a broad range of phenomena including active galactic nuclei\, x-ray binarie s\, gamma-ray bursts\, tidal disruption events\, and strong gravity regimes like those probed by the Event Horizon Telescope.\n\nhttps://jsi.astro.umd .edu/jsi-colloquium-series LAST-MODIFIED:20150406T154817Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium **CANCELLED** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150330T163000Z DTEND:20150330T190000Z DTSTAMP:20260828T094430Z UID:tscpi2m92174pto4affncfujdo@google.com CREATED:20150218T140847Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: The LHC and the Search for New Physics\n\nSpeaker: Albert de Roeck\, CERN\n\nAbstract: The experiments at the LHC have completed data ta king of proton-proton\ncollisions at a centre of mass energy of 8 TeV in 20 13. In the spring of this year\nthe LHC will start its operation again at a higher centre of mass energy of\n13 TeV. We will review here a number of s earches conducted with the present\nLHC data\, leading so far to limits for possible New Physics\, and discuss the\nprospects for the upcoming higher energy run. Eg. for the case of\nsupersymmetry\, with the first year of dat a taken at 13 TeV most of the\nlimits derived from the 8 TeV data will be surpassed\, making early\ndiscoveries possible. We will also pay special at tention to the potential of\nthe LHC data to contribute to the question of the nature of dark matter.\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/ept-joint?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.tscpi2m92174pto4affncfujdo &hs=121 LAST-MODIFIED:20150218T140847Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Joint Seminar w/ Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140711T140000Z DTEND:20140711T150000Z DTSTAMP:20260828T094430Z UID:qv2n4njtrnjuivcfub10cflk1s@google.com CREATED:20140709T152408Z DESCRIPTION:\n\nSpeaker: Prof. Yaron Silberberg\, Weizmann Institute of Sci ence Rehovot\, Israel\n\nTitle: Quantum walks in photonic lattices\n\nAbstr act:: \nWhen a single photon propagates in an array of coupled optical wave guides\, it performs a quantum random walk – it hopes from site to site in a probabilistic manner. Photons propagating in such systems evolve in close analogy with electron transport in crystals: Both are modeled by the same tight-binding model. This enabled in recent years the direct observations a nd detailed studies of basic condense matter phenomena\, from Bloch Oscilla tions to Anderson Localization. While a single particle quantum walk essen tially reproduces wave theory predictions\, the simultaneous walk of severa l indistinguishable photons show unique and surprising quantum features in their correlation functions. I shall discuss the evolving correlations in periodic and disordered lattices\, and review recent experiments.\n\n \n\nF or more information\, please contact Prof. Howard Milchberg (milch@umd.edu) .\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/phys ics.umd.edu/ireap-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXA uY2FsZW5kYXIuZ29vZ2xlLmNvbQ.qv2n4njtrnjuivcfub10cflk1s&hs=121 LAST-MODIFIED:20140709T152408Z LOCATION:IREAP Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151211T190000Z DTEND:20151211T200000Z DTSTAMP:20260828T094430Z UID:8eeummq5r4b5mhkd0dhvleuh5c@google.com CREATED:20151204T194735Z DESCRIPTION:Speaker Name: Dr. Simon Slutsky\n\nSpeaker Institution : Kellog g Radiation Lab\, Caltech\n\nTitle : "Precision Measurements with Ultra-Col d Neutrons" LAST-MODIFIED:20151204T194735Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140226T163000Z DTEND:20140226T180000Z DTSTAMP:20260828T094430Z UID:5sca6858tenbek012tr69fap54@google.com CREATED:20140122T205417Z DESCRIPTION:Title: Resummed Jet Bin Predictions\n\nSpeaker: Liu Xiaohui\, N orthwestern\n\nAbstract: We provide combined predictions with resummation f or cross sections in the H +0-jet and H +1-jet bins\, and give an improved theory covariance matrix for use in experimental studies. The results based on a complete framework for the combination of resummed results for produc tion processes in different exclusive jet bins. LAST-MODIFIED:20140224T162931Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141210T180000Z DTEND:20141210T190000Z DTSTAMP:20260828T094430Z UID:eu8mnnlpulllbcl4b65k1sd9jg@google.com CREATED:20141208T185907Z DESCRIPTION:\nTitle : High Tech Start-Ups: My Journey in the Lighting Indus try\n\nSpeaker Name: Jean Tokarz-Scott\, NanoPhotonical\n\nAbstract : Do yo u wonder what you would do once you graduate? Would you stay in academia or would you pursue a career in some high tech industry? If you choose to ven ture out\, would you work for an established company or a start-up? Perhaps you might have thoughts of starting your own company centered on technolog y that inspired you in school. In this talk you will hear about my journey through the start-up world and my experiences with different lighting techn ologies. I will focus on two of the high tech start-ups I have worked for\, and talk about the history\, technology\, funding\, and challenges I have faced in both of these companies. While start-ups have many challenges\, pr ograms are in place around the world for education and support. It can be a daunting journey\, but also one filled with valuable experiences and oppor tunities. And when the company succeeds\, the rewards are boundless! So\, w hat will you do? Are start-ups worth the risk? Learn about my start-up jour ney and judge for yourself.\n\nJoin with Google Hangouts: https://hangouts. google.com/hangouts/_/physics.umd.edu/lps-seminar?hceid=bGJrNjYwYTc1YjhqaDd lazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.eu8mnnlpulllbcl4b65k1sd 9jg&hs=121 LAST-MODIFIED:20141208T185907Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150402T193000Z DTEND:20150402T203000Z DTSTAMP:20260828T094430Z UID:hn69cparh2vprclrt5rji67ur0@google.com CREATED:20150330T132335Z DESCRIPTION:Speaker Name: Dr. David A. Hammer\n\nSpeaker Institution : Corn ell University\n\nTitle : Fusion Power\, a Grand Challenge Applied Science and Engineering Problem for the 21st Century\n\nAbstract : Although "everyo ne knows" that we will always have fusion 20 years from now\, no matter wha t the year is today\, there has been considerable progress in the 60 years since the quest for practical controlled fusion power began. In this talk\ , I will discuss the fundamentals of generating energy from fusion of hydro gen nuclei\, what reaction look most promising for a first generation react or\, the benefits of working even harder to achieve a second generation rea ctor\, and why we want to do it (no matter how long it takes to succeed). I will then talk about where we are on the road to a practical fusion react or of some sort and what major technological achievements are still needed to get there. \n\nNotes: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS bui lding but not at the 4H building. LPS is on the UMCP shuttle route\; take # 105 for the Courtyard Apts. Please use the phone on the left hand side of t he front door to call the receptionist for entry.\n\n LAST-MODIFIED:20150330T132335Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151001T163000Z DTEND:20151001T173000Z DTSTAMP:20260828T094430Z UID:5ge8fpku916739c1tb666t4v0k@google.com CREATED:20150928T134149Z DESCRIPTION:Title: A Low Dimensional Paradigm for High Dimensional Chaos\nS peaker: Suddhasattwa Das\, Dept. of Math.\, UMD LAST-MODIFIED:20150928T134149Z LOCATION:IREAP Conference Room (ERB 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:APPLIED DYNAMICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140211T181500Z DTEND:20140211T193000Z DTSTAMP:20260828T094430Z UID:hg27dci6vn2nd174na08mvb8dg@google.com CREATED:20140203T152719Z DESCRIPTION:Location: Room 1116 IPST Bldg.\, Bldg 85\n\nTitle : Symmetries\ , Cluster Synchronization\, and Isolated Desynchronization in Complex Netwo rks\n\nSpeaker Name: Dr. Lou Pecora\n\nSpeaker Institution : Naval Research Laboratory\n LAST-MODIFIED:20140203T152719Z LOCATION:Room 1116 IPST Bldg.\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131212T183000Z DTEND:20131212T193000Z DTSTAMP:20260828T094430Z UID:njltkg5ct4v3d84c3tki42bto8@google.com CREATED:20131204T155537Z DESCRIPTION:*Please note new location*\n\nTitle: Neutron-Antineutron Trans itions from the Lattice\n\nSpeaker: Michael Buchoff\, University of Washing ton\n\nAbstract: In the everyday exploration of our matter filled universe \, one scenario that rarely crosses our mind is the possibility of matter s uddenly transitioning to antimatter. While this idea seems far-fetched\, t here is ample collider evidence that this occurs in mesonic physics such as kaon-mixing and B-mixing\; both instances indicative of the weak interacti on. One intriguing instance that hits closer to the low-energy world we s ee everyday is the possibility that a neutron can transition to an antineut ron via some beyond-the-Standard-Model (BSM) interaction that changes baryo n number by two units. In fact\, such interactions are natural in grand-un ified-theories (GUTs) with Majorana neutrinos that violate lepton number. O bviously\, this transition cannot occur too frequently (none of us would ex ist)\, but any indication of this process would not only imply new physics\ , but address the monumental question of what early universe process enable d the baryon-antibaryon asymmetry that we see today. Even if a signal is not observed\, very tight constraints can be put on large classes of theore tical models by bounding the transition rate. However\, to make a reliable prediction/interpretation of this transition rate\, the dimension-six neut ron-antineutron matrix elements must first be calculated non-perturbatively via lattice QCD. In this talk\, I will briefly review the promising exper imental prospects along with the theoretical implications\, and I will pres ent preliminary results of the non-perturbative lattice QCD calculations th at are necessary to understand these theoretical implications. LAST-MODIFIED:20131204T181340Z LOCATION:4102 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151022T193000Z DTEND:20151022T210000Z DTSTAMP:20260828T094430Z UID:7qru7umbecp4rsvu2v5urk9nmc@google.com CREATED:20151019T163358Z DESCRIPTION:Speaker: Paul Green (UMd)\nAbstract: We will continue the discu ssion of Hodge theory with emphasis on the monodromy associated with famili es of Calabi-Yau manifolds. A useful reference\nis the paper of David Morri son: Mirror symmetry and rational curves on quintic threefolds: a guide for mathematicians. J. Amer. Math. Soc. 6 (1993)\, no. 1\, 223-247.\nA link ma y be found on the RIT Wiki. In this third lecture we will explain how ever ything works in the case originally treated by Candelas-de la Ossa-Green-Pa rkes. LAST-MODIFIED:20151019T163358Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Hodge theory\, part 3: Monodromy and mirror symmetry after Morrison TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140902T200000Z DTEND:20140902T210000Z DTSTAMP:20260828T094430Z UID:6o69eks0v7rvpfu6e51a9tbnk0@google.com CREATED:20140811T152307Z DESCRIPTION:Speaker Name: Matthias Troyer\n\nSpeaker Institution: ETH Zür ich\n\nTitle: Validation of quantum devices: from quantum random numbers t o the D-Wave devices\n\nAbstract: About a century after the development of quantum mechanics we have now reached an exciting time where non-trivial d evices that make use of quantum effects can be built. While a universal qua ntum computer of non-trivial size is still out of reach there are a number commercial and experimental devices: quantum random number generators\, qua ntum encryption systems\, and analog quantum simulators. In this colloquium I will present some of these devices and validation tests we performed on them. Quantum random number generators use the inherent randomness in quant um measurements to produce true random numbers\, unlike classical pseudoran dom number generators which are inherently deterministic. Optical lattice e mulators use ultracold atomic gases in optical lattices to mimic typical mo dels of condensed matter physics. Finally\, I will discuss the devices buil t by Canadian company D-Wave systems\, which are special purpose quantum si mulators for solving hard classical optimization problems.\n\n\n\n\n \n\n\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5 kYXIuZ29vZ2xlLmNvbQ.6o69eks0v7rvpfu6e51a9tbnk0&hs=121 LAST-MODIFIED:20140818T200556Z LOCATION:Lobby of the Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T203000Z DTEND:20140414T213000Z DTSTAMP:20260828T094430Z UID:dpeq6l3redktsjr3kucaiqofvo@google.com CREATED:20140203T161958Z DESCRIPTION:Speaker Name: Peter Yoon\n\nSpeaker Institution : University of Maryland\, IPST\n\nTitle : Understanding the Origin of Non-Maxwellian Char ged-Particle Distribution in Space\n\nAbstract: Charged particle accelerat ion takes place ubiquitously in the Universe including the near-Earth helio spheric environment. Typical in situ spacecraft measurements made in the so lar wind show that the charged particle velocity distribution contains ener getic components with quasi scale-free power-law velocity dependence\, f ~ v^{−a}\, for high velocity range. In this talk a theory of quiet-time solar -wind electrons that contain a suprathermal component is discussed\, in whi ch these electrons are taken to be in dynamical equilibrium with Langmuir t urbulence. Theoretical predictions of high-energy electron velocity power-l aw distribution index is then compared against the recent observations of t he superhalo electron velocity distribution made by instruments onboard WIN D and STEREO spacecraft. It is shown that the theoretical prediction of vel ocity power-law index is intermediate to the observed range.\nNotes: Tea an d Cookies 4:15-4:30 pm\n LAST-MODIFIED:20140408T202617Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151202T190000Z DTEND:20151202T210000Z DTSTAMP:20260828T094430Z UID:645F1236-163A-402A-B6D4-0F491CEF9D0F CREATED:20151120T160031Z DESCRIPTION:Speaker Name: Greg Landsberg\n\nSpeaker Institution : Brown Uni versity\n\nTitle : "New Results from CMS: from 8 to 13 TeV"\n\nAbstract : T he first LHC run after the long shutdown of 2013-2014 at 13 TeV opened unch arted \nterritory of much higher collision energy than ever achieved before . I'll cover the first \nphysics results obtained by the CMS Collaboration with these new data\, as well as the \nlatest results based on the LHC Run 1 data\, which are still being analyzed in a number \nof sophisticated and inventive ways (e.g.\, analyses based on "parked data"). While \nthe main f ocus of this talk is on searches for new physics and full exploration of th e \nrecently discovered Higgs boson\, I'll also highlight some of the recen t precision \nstandard model measurements and results from the heavy-ion ph ysics program.\n\nNotes: This is a joint experimental-theory talk with atte ndees from UMD and Johns Hopkins University. Lunch will be served outside P SC room 3150 at 12:30 PM. LAST-MODIFIED:20151120T200504Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140428T203000Z DTEND:20140428T213000Z DTSTAMP:20260828T094430Z UID:mtqu3vbrf3a796n7ndbo854se8@google.com CREATED:20140203T164044Z DESCRIPTION:Speaker Name: Greg Sullivan\n\nSpeaker Institution : University of Maryland\, Physics\n\nTitle: Recent Results on the Observation of High Energy Astrophysical Neutrinos from IceCube\n\nAbstract: I present the late st results on the observation of high energy astrophysical neutrinos using the IceCube neutrino telescope deployed at the Antarctic South Pole Station . The IceCube detector instruments one cubic kilometer of deep ice and was finished with construction in December 2010\, with operation of the complet ed detector starting in May 2011. Since that time IceCube has made the worl d's first observation of a diffuse flux of high energy neutrinos of non-ter restrial origin. This first evidence was published in the Journal Science i n Fall 2013. Since that ground breaking initial result we have added data i n both new analysis channels and the original analysis that further support our original evidence. IceCube has also made significant scientific contri butions to the astrophysical theory of neutrino production in gamma-ray bur sts (GRB). While GRB were a favored candidate for the yet unknown source of the highest energy cosmic rays\, in 2012 IceCube published a result in the journal Nature that essentially ruled ruled out gamma-ray bursts as the so le source of these cosmic rays. I also present the current status of the ev olving theory and data in the search for high energy neutrino emission from GRB. Finally\, I will describe current thinking and potential next stage e xperimental programs to further our capability for performing high energy n eutrino astrophysics and astronomy now that we have observed a non-zero flu x astrophysical flux of neutrinos.\nNotes: Tea and Cookies 4:15-4:30 pm\n LAST-MODIFIED:20140421T160444Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140609T180000Z DTEND:20140609T190000Z DTSTAMP:20260828T094430Z UID:4l62p11ersrfcbn8mdaffvgqt8@google.com CREATED:20140605T201807Z DESCRIPTION:Speaker Name: Mary Lyon\n\nSpeaker Institution: Brigham Young U niversity\n\nTitle: Achieving Higher in an Ultracold Neutral Plasma\n\nAbsr act: Ultracold neutral plasmas are generated by photoionizing laser-cooled atoms close to threshold. The ion strong coupling at early times after the plasma is created is high\, due to the very low initial temperature (1 mK) of the ions. However the strong coupling parameter r is limited at times la ter than 100 ns by an ultrafast\, nonequilibrium relaxation of the ions. Th is process is called “disorder-induced heating” (DIH) and it limits r in ou r plasmas to order unity. In this talk I will describe an experiment in an ultracold neutral calcium plasma that shows that electron screening slows t he ion equilibration rate and reduces the equilibrium ion temperature\, but also limits the effective (screened) ion strong coupling ˆto approximately 2. I will also present recent results from an experiment designed to incre ase the strong coupling of an ultracold neutral plasma by promoting the pla sma ions to the second ionization state. Simulations predict that the maxim um value of r \ndepends on the time at which the second ionization laser pu lses arrive relative to the DIH phase of the plasma. Using laser-induced fl uorescence we map out the ion velocity distribution of the Ca+ ions in a pa rtially doubly ionized plasma and show that the heating due to the second i onization depends on the timing of the second ionization laser pulses\, as predicted by MD simulations. I will also discuss the future of this project and other projects underway that are designed to increase r in an ultracol d neutral plasma.\n\nHost: Trey Porto\n\n\nJoin with Google Hangouts: https ://hangouts.google.com/hangouts/_/physics.umd.edu/jqi?hceid=bGJrNjYwYTc1Yjh qaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.4l62p11ersrfcbn8mda ffvgqt8&hs=121 LAST-MODIFIED:20140606T180148Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151117T181500Z DTEND:20151117T193000Z DTSTAMP:20260828T094430Z UID:bqvdqufr1r8gjo3qotrbelshcc@google.com CREATED:20151111T173621Z DESCRIPTION:Speaker Name: Zhonghan Hu\n\nSpeaker Institution : Jilin Univer sity\n\nTitle: Ewald Sum in One\, Two or Three Dimensional Periodicity\n\n\ n LAST-MODIFIED:20151111T173812Z LOCATION:Room 1116 IPST building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140508T163000Z DTEND:20140508T173000Z DTSTAMP:20260828T094430Z UID:oupee0ubk38992ptpb959sdplk@google.com CREATED:20140425T171651Z DESCRIPTION:Speaker Name: Noah Cowan\n\nSpeaker Institution : Johns Hopkins University\n\nTitle : Feedback control as framework for understanding trad eoffs in biology\n LAST-MODIFIED:20140425T171651Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140916T171500Z DTEND:20140916T183000Z DTSTAMP:20260828T094430Z UID:jld01ta9lohg387dtapaa8d7hs@google.com CREATED:20140915T135314Z DESCRIPTION:Speaker Name: Professor Dio Margetis\n\nSpeaker Institution : U MCP\n\nTitle : Quantum Many-Body Dynamics: Some Rigorous Results on Bose-Ei nstein Condensation.\n\nJoin with Google Hangouts: https://hangouts.google. com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1 ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jld01ta9lohg387dtapaa8d7hs&hs=121 LAST-MODIFIED:20140915T174334Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150209T160000Z DTEND:20150209T170000Z DTSTAMP:20260828T094430Z UID:v7prf7eeqq580ev1tb5lfqn2fs@google.com CLASS:PUBLIC CREATED:20150203T185111Z DESCRIPTION:Speaker Name: Paola Cappellaro\n\nSpeaker Institution: MIT\n\nT itle: Hamiltonian Filters for Sensing and Simulation\n\nAbstract: Controlli ng the evolution of complex quantum systems by Hamiltonian engineering enab les a variety of tasks\, including quantum simulation and improved quantum metrology. For example\, simple pulsed dynamical decoupling schemes can pro tect against decoherence by acting as noise filters\, while at the same tim e revealing information about the noise sources themselves.\nIn this talk I will show how we can engineer the evolution of quantum system by creating more general dynamic filters\, which select only some desired interactions. I will present some applications of these techniques to quantum simulation and quantum sensing\, where they can achieve high frequency resolution\, t hus allowing precise spectroscopy and imaging. In particular\, I will illus trate applications of these strategies in experimental implementations base d on the Nitrogen-Vacancy center in diamond.\n LAST-MODIFIED:20150205T210025Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140407T190000Z DTEND:20140407T200000Z DTSTAMP:20260828T094430Z UID:5lrdkm1hffni6k3ph4fe6qhvek@google.com CREATED:20140331T145140Z DESCRIPTION:Title: Dark Matter Detections in Photons Split by a Million in Energy: Interpretations of X-ray lines and Gamma-ray Bumps\n\nSpeaker: Kevo rk N. Abazajian\, UC Irvine\n\nAbstract: I will give an overview of the ana lyses leading to two recent candidate detections of photons from dark matte r. Specifically\, these are: first\, gamma rays in a continuum "bump" at a few GeV which can be due to WIMP-like dark matter annihilation in the Galac tic Center\; and\, second\, X-rays from clusters of galaxies and Andromeda consistent with monoenergetic photons from dark matter decay such as that p redicted from sterile neutrino dark matter. I will discuss the particle and cosmological model implications of both candidate signals. \n LAST-MODIFIED:20140401T212018Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140117T153000Z DTEND:20140117T163000Z DTSTAMP:20260828T094430Z UID:f31rkh9kdf8tse3lou2ge2nr10@google.com CLASS:PUBLIC CREATED:20140102T183744Z DESCRIPTION:Speaker: Mazyar Mirrahimi\n\nInstitution: INRIA Paris-Rocquenco urt and Yale University\n\nTitle: Dynamically protected cat-qubits with qua ntum superconducting circuits.\n\nAbstract: I will present a new hardware-e fficient paradigm for encoding\, protecting and manipulating quantuminforma tion in a quantum harmonic oscillator\, more specifically a cavity mode.Whi le an initial scheme [1] has allowed us to encode the quantum information o na four-component Schrödinger cat state [2]\, a continuous monitoring ofpho ton-number parity observable [3] should lead to a protected quantum memory[ 4]. After briefly presenting these results\, I will elaborate on how throug h amulti-photon driven dissipative process and quantum Zeno dynamics\, one canextend this scheme towards a new paradigm for universal quantum computat ionwith protected logical qubits [5]. [1] Leghtas et al.\, Deterministic pr otocol for mapping a qubit to coherentstate superpositions in a cavity\, Ph ys. Rev. A\, 87: 042315\, 2013. [2] Vlastakis et al.\, Deterministically en coding quantum information using100-photon Schrödinger cat states\, Science 342: 607-610\, 2013. [3] Sun et al.\, Tracking photon jumps with repeated quantum non-demolitionparity measurements\, 2013\, ArXiv:1311.2534. [4] Leg htas et al.\, Hardware-efficient autonomous quantum memory protection\,Phys . Rev. Lett.\, 111\, 120501\, 2013. [5] Mirrahimi et al.\, Dynamically prot ected cat-qubits: a new paradigm foruniversal quantum computation\, 2013\, ArXiv:1312.2017. LAST-MODIFIED:20140103T172030Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141211T173000Z DTEND:20141211T183000Z DTSTAMP:20260828T094430Z UID:dercklpe36muuqq96bnfl9ltsc@google.com CREATED:20140911T190347Z DESCRIPTION:Speaker: Matt Landreman\, University of Maryland\nTitle: Non-m odal amplification and subcritical turbulence in a plasma\n\nAbstract:\nIt is well established that certain fluid flows with no growing linear eigenmo des can still support turbulence. Here we discuss a related phenomenon in a plasma\, related to drift waves driven by a density gradient. The hydrod ynamic and plasma problems are different in that sheared equilibrium flow i s not needed in the latter case\, and the shearing of the magnetic field pl ays a role like viscosity. As in the hydrodynamic case\, in the plasma pro blem there can be substantial transient linear growth before exponential de cay. Generalizing an argument from hydrodynamics\, we can prove that such transient linear growth is necessary for sustained nonlinear turbulence.\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.dercklpe36muuqq96bnfl9ltsc&hs=121 LAST-MODIFIED:20141208T190003Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140904T173000Z DTEND:20140904T180000Z DTSTAMP:20260828T094430Z UID:2t8f68ntjv3fcgcaljkff9qsfg@google.com CREATED:20140828T211351Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.2t8f68ntjv3fcgcaljkff9qsfg&hs=121 LAST-MODIFIED:20140828T211406Z LOCATION:Phys room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151120T150000Z DTEND:20151120T163000Z DTSTAMP:20260828T094430Z UID:f07t5djb94o6vl83kp0b5nfe90@google.com CREATED:20151106T204921Z DESCRIPTION:Speaker: Kai Sun (University of Michigan\, Ann Arbor)\n\nTitle: Fractional topological states in lattice systems\n\nAbstract: In this talk \, I will review the recent progress on the search for fractional topologic al states in lattice systems\, focusing on the key ingredients that are nec essary for stabilizing these exotic states of matter. In particular\, two p ossible pathways will be discussed using either (a) topological flat bands or (b) frustrated lattices on which a discretized Chern-Simons theory can b e constructed. For the second approach\, I will first demonstrate a generic construction for a discretized Chern-Simons theory. This discretized topol ogical field theory provides important guiding principles for the search of fractional topological states. I will discuss two specific lattice models\ , in which fractional states are predicted according to our theory. Numeric al evidences will also be discussed to compare with the theory.\n\nHost: Wi ll Cole\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151106T204921Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T200000Z DTEND:20140512T210000Z DTSTAMP:20260828T094430Z UID:lunf0235g1bd9j7tsiaaomv0d0@google.com CREATED:20140506T173707Z DESCRIPTION:Speaker Name: Dr. Scott Ransom\n\nSpeaker Institution: NRAO\n\ nTitle: Nuclear Physics at Two Kiloparsecs with Millisecond Pulsars\n\nAbs tract: The central densities of neutron stars are the highest known in the Universe\, so measurements probing the interiors of radio pulsars\, or eve n just their masses and radii\, can give us unique insights into the physic s of matter at extreme densities. The discovery of several interesting new pulsars as well as improved instrumentation has finally allowed us to start measuring the masses of the rapidly spinning millisecond pulsars. High-pre cision radio timing measurements of relativistic parameters\, like the Shap iro Delay\, have yielded several neutron stars near 2 solar masses\, while optical observations of some "black widow" radio pulsars have indicated pot entially even more massive neutron stars. Such systems strongly constrain t he equation of state of neutron star matter and a variety of other topics i n physics/astrophysics. New radio telescopes like MeerKAT\, FAST\, and the SKA will provide many new pulsars and corresponding new mass measurements.\ nRefreshments available at 3:30 pm LAST-MODIFIED:20140507T145414Z LOCATION:Room 1136 Physical Sciences Complex\, University of Maryland SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151005T110000 DTEND;TZID=America/New_York:20151005T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151005T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker: Stephen Jordan\, QuICS/ NIST \n\nTitle: Simulating qua ntum field theories on a quantum computer\n\nAbstract: First\, I will descr ibe an efficient quantum algorithm to approximate scattering amplitudes in certain quantum field theories of massive particles at both strong and weak coupling. Second\, I will describe how to encode arbitrary quantum computa tions in the scattering amplitudes of even very simple quantum field theori es. Together\, these results can be roughly interpreted as showing that qua ntum computers can efficiently simulate these quantum field theories but cl assical computers cannot. Familiarity with particle physics will not be ass umed. This is joint work with John Preskill\, Keith Lee\, and Hari Krovi. LAST-MODIFIED:20150831T135352Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150518T150000Z DTEND:20150518T160000Z DTSTAMP:20260828T094430Z UID:ul6e3dt85km9gearafe2sbf158@google.com CLASS:PUBLIC CREATED:20150504T121939Z DESCRIPTION:Speaker Name: Donghyun Cho\n\nSpeaker Institution: Korea Unive rsity\n\nTitle: Use of vector polarizability to manipulate alkali-metal ato ms\n\nAbstract: Energy shift of an alkali-metal atom in a laser beam has a Zeeman-like shift\, which depends on the laser polarization\, in addition t o a usual scalar term. The Zeeman-like shift is mediated by the spin-orbit coupling and it is proportional to the vector polarizability . In my presen tation\, I will discuss a few experiments using to manipulate ground-state alkali-metal atoms: (i) When the laser is circularly polarized and its freq uency is properly tuned between the D1 and D2 transitions\, the scalar term vanishes and the ac Stark shift takes the form of a pure Zeeman shift. We constructed\nan optical trap that behaved like a magnetic trap and carried out the Stern-Gerlach experimentusing a laser intensity gradient in place o f a magnetic eld gradient. (ii) For the atoms in an optical trap\, one can tune out a differential ac Stark shift of a Zeeman-sensitive ground-hyperne transition by adjusting polarization of the trapping eld. By using the \\m agic polarization" for 7Li atoms\, we achieved 0.6 Hz linewidth for Rabi sp ectroscopy and 820 ms coherence time for Ramsey spectroscopy. (iii) When th e trapping eld has a circular component\, its potential well depends on the Zeeman quantum number mF of a trapped atom and its vibration frequency dep ends on mF. It implies that if one applies bichromatic elds in a congurati on between two Zeeman sublevels\, the two-photon resonance condition to ind uce a coherent population trapping (CPT) depends on\nthe vibrational quantu m number. This situation is analogous to the velocity-selective CPT used fo r sub-recoil cooling of free meta-stable He atoms\, where the two-photon re sonance condition depended on atomic velocity. I will discuss possibility o f using the \\motion-selective CPT" to cool alkali-metal atoms in an optica l lattice below the recoil limit. LAST-MODIFIED:20150518T124530Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160107T160000Z DTEND:20160107T170000Z DTSTAMP:20260828T094430Z UID:d6u3qkeu5upilv9s86hcc45eko@google.com CREATED:20151204T210558Z DESCRIPTION:Speaker: Michael Beverland\n\nSpeaker Affiliation: Caltech\n\nT itle: Protected gates for topological quantum field theories\n\nAbstract: W e study restrictions on locality-preserving unitary logical gates for topol ogical quantum codes in two spatial dimensions. A locality-preserving oper ation is one which maps local operators to local operators --- for example\ , a constant-depth quantum circuit of geometrically local gates\, or evolu tion for a constant time governed by a geometrically-local bounded-strength Hamiltonian. Locality-preserving logical gates of topological codes are in trinsically fault tolerant because spatially localized errors remain locali zed\, and hence sufficiently dilute errors remain correctable. By invoking general properties of two-dimensional topological field theories\, we find that the locality-preserving logical gates are severely limited for codes w hich admit non-abelian anyons\; in particular\, there are no locality-prese rving logical gates on the torus or the sphere with M punctures if the brai ding of anyons is computationally universal. Furthermore\, for Ising anyons on the M-punctured sphere\, locality-preserving gates must be elements of the logical Pauli group. We derive these results by relating logical gates of a topological code to automorphisms of the Verlinde algebra of the corre sponding anyon model\, and by requiring the logical gates to be compatible with basis changes in the logical Hilbert space arising from local F-moves and the mapping class group. \n\nThis is joint work with Oliver Buerschaper \, Robert Koenig\, Fernando Pastawski and Sumit Sijher.\n LAST-MODIFIED:20160105T152604Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140306T173000Z DTEND:20140306T183000Z DTSTAMP:20260828T094430Z UID:d42ejrevvke3g4mckubhvjt540@google.com CREATED:20140228T151328Z DESCRIPTION:Speaker Name: Kenneth De Jong\n\nSpeaker Institution : GMU\n\nT itle : Understanding Complex Adaptive Systems: An Evolutionary Agent-based Approach\n\nAbstract : Understanding the properties and the behavior of com plex adaptive systems continues to be an important but difficult issue. Wh ile some progress can be made using formal analysis tools\, the complex non -linear dynamics of many systems of interest often require a significant nu mber of simplifying assumptions in order to produce formal results. We hav e been exploring an alternative approach that combines the power of two met hodologies: agent-based modeling and evolutionary computation. In this tal k I will describe the architecture of this hybrid approach and illustrate i ts application to a number of problem areas including computer network secu rity\, homeland defense\, and inhalation anthrax studies.\n LAST-MODIFIED:20140312T201121Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150512T150000Z DTEND:20150512T160000Z DTSTAMP:20260828T094430Z UID:03d46s3ecl9hlehipkk2752mco@google.com CREATED:20150508T165323Z DESCRIPTION:Speaker Name: Abolhassan Vaezi \n\nSpeaker Institution: Cornel l\n\nTitle: Universal Quantum Computation from Bilayer Quantum Hall States\ n\nAbstract: The possibility of realizing non-Abelian statistics and utiliz ing it for topological quantum computation (TQC) has generated widespread i nterest. However\, the non-Abelian statistics that can be realized in most accessible proposals is not powerful enough for universal TQC.\n\nIn this t alk\, I will consider a simple bilayer fractional quantum Hall system with 1/3 Laughlin state in each layer. Then I will show that a certain type of i nterlayer couplings which are experimentally relevant in higher Landau leve ls can drive a topological phase transition to an exotic non-Abelian state with famous `Fibonacci' anyon\, whose non-Abelian statistics is powerful en ough for universal TQC.\n\nFinally\, I will present our recent numerical re sults on exact diagonlization of the model Hamiltonian for up to 14 electro ns on sphere and torus geometries where we consider interlayer tunneling as well as modified Coulomb interaction. We find 6-fold ground-state degenera cy on the torus when the hollow-core component of the interlayer Coulomb in teraction is dominant. To identify the topological nature of this phase we measure orbital-cut entanglement spectrum\, quasi-hole counting\, topologic al entanglement entropy and wave-function overlap. Comparing the numerical results to the theoretical predictions\, I will argue that this 6-fold grou nd-state degeneracy phase is the non-Abelian bilayer Fibonacci state.\n\n\n References:\n1- Z. Liu\, A. Vaezi\, K. Lee\, and E.-A. Kim\, arXiv:1502.053 91 (2015)\n2- A. Vaezi\, and M. Barkeshli\, Phys. Rev. Lett. 113\, 236804 ( 2014)\n3- A. Vaezi\, Phys. Rev. X\, 4\, 031009 (2014)\n\nHost: Sriram Ganes han\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150508T170937Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141114T160000Z DTEND:20141114T210000Z DTSTAMP:20260828T094430Z UID:0rv79b9rvick13n81oa6fg9fas@google.com CREATED:20141020T213714Z DESCRIPTION:Talk schedule:\n\n11:00 AM Philip Brydon\, Topological superco nductivity from phonons?\n\n11:45 AM Hoi Yin Hui\, Majorana fermions in a ferromagnetic wire on the surface of a bulk spin-orbit coupled s-wave super conductor\n\n1:30 PM Yang-Le Wu\, Braiding non-Abelian quasiholes in fract ional quantum Hall states\n\n2:15 PM Meng Cheng\, Majorana Zero Modes at t he Edge of Integer Quantum Hall States\n\n3:00 PM Tudor Stanescu\, Topolog ical Superconductivity in Proximity-Coupled Topological Insulator Nanoribbo ns\n\n\nThe entire talk schedule can be found at http://www.physics.umd.edu /cmtc/seminars.html LAST-MODIFIED:20141020T213714Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 4 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150505T171500Z DTEND:20150505T183000Z DTSTAMP:20260828T094430Z UID:h2e9i8rrfpc3uedka3267ppl4c@google.com CREATED:20150422T152937Z DESCRIPTION:Speaker Name: Dr. Christopher Bertrand\n\nSpeaker Institution : NIST\n\nTitle : Direct Measurement of Critical Adsorption on a Spherical S urface\n\nAbstract : When colloidal particles are suspended in a homogeneou s binary solvent\, one component will be preferentially adsorbed on the sur face of the particles. As the solvent critical (demixing) point is approach ed\, the size of this adsorbed layer grows with the correlation length of t he solvent fluctuations\, a phenomenon known as critical adsorption. Critic al adsorption layers on colloidal particles can shift phase boundaries and alter colloidal stability via critical Casimir interactions. A thorough und erstanding of adsorption-induced phenomena requires detailed information ab out the dependence of adsorption on temperature\, solvent concentration and particle surface chemistry and size. Using small-angle neutron scattering (SANS)\, we have recently measured critical adsorption on silica particles (30 nm) suspended 2\,6-lutidine/water mixtures. Our results demonstrate tha t SANS can provide detailed information about the shape of the surface conc entration profile and the excess adsorption. This talk will focus on the ef fects of solvent concentration and particle curvature on critical adsorptio n. \n LAST-MODIFIED:20150422T152937Z LOCATION:Room 1116 IPST Bldg\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140306T200000Z DTEND:20140306T210000Z DTSTAMP:20260828T094430Z UID:o9lvihpg1ronqi9f3j1f3g1ib0@google.com CREATED:20140227T185521Z DESCRIPTION:Speaker: Ike Chukwu (UMCP)\n\nTitle: Introduction to supersymm etry\n\nFor more information on RIT\, please visit http://www-math.umd.edu/ research/seminars/rit-on-geometry-and-phsyics.html LAST-MODIFIED:20140228T035520Z LOCATION:Physics 4208 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141107T180000Z DTEND:20141107T190000Z DTSTAMP:20260828T094430Z UID:hk3lfrir8v2m5fapmj7pd40ei8@google.com CREATED:20141031T201105Z DESCRIPTION:Speaker Name: Matthew Pelton\n\nSpeaker Institution : Departmen t of Physics\, UMBC\n\nTitle : New Physics and Functionality with Nanophoto nic Materials: Nanoplatelet Lasers\, Vibrating Metal Nanoparticles\, and Co upled Metal-Semiconductor Nonlinear Hybrids\n\nAbstract: Semiconductor nano crystals and metal nanoparticles are key building blocks for nanophotonics\ , because they both interact strongly with light in a way that can be tuned by changing the size\, shape\, and composition of the particles. The incr easing ability to control the nanoscale structure of these materials contin ues to provide new functionalities and to reveal new material properties. I will discuss some of my recent attempts to understand and take advantage of structure-property relationships for nanophotonic materials: \n\n(1) F lat\, thin semiconductor nanocrystals\, or nanoplatelets\, outperform all p revious semiconductor nanocrystals as the active materials for lasers\, lar gely due to the unique\, structure-dependent carrier dynamics in the nanopl atelets.\n\n(2) All-optical measurements of the mechanical vibrations of p lasmonic metal nanoparticles reveal complex\, viscoelastic behavior in simp le fluids\, and have the promise to enable ultrasensitive mass detection.\n \n(3) Coherent coupling of plasmonic metal nanoparticles to semiconductor nanocrystals has the potential to produce strong\, ultrafast nonlinearities \, which may enable all-optical classical and quantum information processin g.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_ /physics.umd.edu/materials?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdX AuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.hk3lfrir8v2m5fapmj7pd40ei8&hs=121 LAST-MODIFIED:20141031T201105Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130919T173000Z DTEND:20130919T180000Z DTSTAMP:20260828T094430Z UID:btrihd7iiu6obf5pmstl47oh5c@google.com CREATED:20130916T172307Z LAST-MODIFIED:20130916T172315Z LOCATION:Phys room 1305B\, The "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150401T200000Z DTEND:20150401T213000Z DTSTAMP:20260828T094430Z UID:3db78ofu12big7lso6o972oqno@google.com CREATED:20150327T190236Z DESCRIPTION:Speaker Name: Jacques Farine\n\nSpeaker Institution : Laurentia n University\n\nTitle : "High Sensitivity Radon Measurements for Low Backgr ound Experiments"\n\nAbstract : The Sudbury Neutrino Observatory (SNO) has resolved the Solar Neutrino Problem by demonstrating the oscillation of sol ar neutrinos.\nThis result was possible thanks to novel background monitori ng techniques\, including the assay of radium isotopes in ultra-pure water\ nwith a sensitivity of 1 atom/10 tonnes in the Thorium chain. The radon det ectors developed to measure the radon emanation of the extracted radium wil l be\npresented\, and the interpretation of counting results for inclusion in the physics signal extraction will be discussed. The counters’ sensitivi ty has been improved for the materials screening program of EXO-200\, which measured directly the slowest process known in nature\, the two-neutrino d ouble-beta decay of 136-Xenon.\nThe high sensitivity to the isotopes 222Rn\ , 220Rn and 219Rn has been of interest to other experiments. Further improv ements are in progress in support\nof the radioactivity control program of nEXO. LAST-MODIFIED:20150327T190454Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140428T150000Z DTEND:20140428T160000Z DTSTAMP:20260828T094430Z UID:vqc69rj43hip7m2k169t2g6ej4@google.com CLASS:PUBLIC CREATED:20140102T150532Z DESCRIPTION:Speaker Name: Vanderlei Bagnato\n\nSpeaker Institution: Institu o de Fisica de Sao Carlos - University of S. Paulo\n \nAbstract: In this s eminar we shall describe the observation of superfluid turbulence \nin an a tomic trapped sample of Rb. Description of excitation\, final side \neffect \, and hydrodynamic properties will be presented. Simulations that\n justif y the experimental observations will be presented. In a second part\n of t he seminar\, the possibility to describe the thermodynamics of a trapped\ns uperfluid using global ( in instead of local) variables will be discussed.\ nMeasurement of heat capacity\, compressibility and the evidences of\ncompl ementarities between pressure and volume will be discussed.\n\nHost: Luis O rozco\n LAST-MODIFIED:20140417T203644Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140821T150000Z DTEND:20140821T160000Z DTSTAMP:20260828T094430Z UID:jhilol59f3vlhthhpap2qff4q8@google.com CREATED:20140729T201736Z DESCRIPTION:Speaker Name: Gregor Weihs\n\nSpeaker Institution: Universität Innsbruck\, Austria\n\nTitle: Single photons and the foundations of quantu m mechanics\n\nAbstract: The interest in the foundations of quantum mechan ics led to the invention of quantum technologies and return\, the tools we have been developing for applications now enable us to make ever more preci se tests of the foundations and potential limitations of quantum theory.\nI n our research we develop sources of nonclassical light\, single photons an d entangled photon pairs and then apply them towards quantum communication and in testing the foundations of quantum mechanics. Recently we have been working on coherent control of semiconductor quantum dots so that they deli ver high fidelity single photons and entangled photon pairs [1\,2]. We have tested the quality of the single photons with novel quantum optical assess ment tools\, for example non-Gaussianity witnesses [3].\nAs an unconvention al application I will present our tests for potential higher-order interfer ences that would go beyond quantum mechanics [4] and interference tests tha t could reveal the necessity for a quaternion-based quantum mechanical desc ription of nature. Even if these tests only yield null results\, they are a ble to rule out alternative theories and thus give us tighter bounds on whe re to look for possible extensions and modifications of quantum theory.\n\n 1.H. Jayakumar\, A. Predojević\, T. Huber\, T. Kauten\, G. S. Solomon\, and G. Weihs\, Deterministic Photon Pairs and Coherent Optical Control of a Si ngle Quantum Dot\, Phys. Rev. Lett. 110\, 135505 (2013)\, DOI: 10.1103/Phys RevLett.110.135505\n2.H. Jayakumar\, A. Predojević\, T. Kauten\, T. Huber\, G. S. Solomon\, and G. Weihs\, Time-bin entangled photons from a quantum d ot\, Nature Communications 5\, 4251 (2014). DOI: 10.1038/ncomms5251\n3.Pred ojević\, M. Ježek\, T. Huber\, H. Jayakumar\, T. Kauten\, G. Solomon\, R. F ilip\, and G. Weihs\, Efficiency vs. multi-photon contribution test for qua ntum dots\, Opt. Express 22\, 4789-4798 (2014). DOI: 10.1364/OE.22.004789\n 4.U. Sinha\, C. Couteau\, T. Jennewein\, R. Laflamme\, and G. Weihs\, Rulin g out multi-order interference in quantum mechanics\, Science 329\, 418-421 (2010). DOI: 10.1126/science.1190545\n\nHost: Glenn Solomon\n\nJoin with G oogle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi- special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.jhilol59f3vlhthhpap2qff4q8&hs=121 LAST-MODIFIED:20140731T144914Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140224T160000Z DTEND:20140224T173000Z DTSTAMP:20260828T094430Z UID:ubitfa4qhq181ke6vmmil6ga8c@google.com CLASS:PUBLIC CREATED:20131216T191918Z DESCRIPTION:Speaker Name: Vlad Manucharyan\n\nSpeaker Institution: Joint Qu antum Institute\n\nTitle:Towards the ultra-strong coupling limit of QED wit h high-impedance superconducting circuits\n\nAbstract:\nIn quantum electrod ynamics (QED)\, the interaction between atoms and photons is typically weak due to the smallness of the fine structure constant. This interaction is e nhanced in superconducting circuit QED\, because microwave fields are typic ally confined to small volumes and dipole moments of artificial atoms can b e made large. Interestingly\, even further increase of interaction is possi ble\, when the characteristic impedance of the superconducting cavity appro aches the value of the resistance quantum. This is equivalent to increasing the effective fine structure constant above unity. Such high-impedance qua ntum circuits are possible when either arrays of Josephson tunnel junctions or highly disordered superconducting films\, such as TiN\, are used as cir cuit elements. As a result\, one can achieve the coupling strength comparab le or even larger than the photon energy\, the so-called ultra-strong coupl ing limit of QED. In this talks\, we will present the current situation wit h experiments on high-impedance quantum circuits and discuss the interestin g new questions that can be addressed in this new regime of quantum physics . LAST-MODIFIED:20140221T211620Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150422T200000Z DTEND:20150422T213000Z DTSTAMP:20260828T094430Z UID:kqajdknf16hltkq5ndmgcico7g@google.com CREATED:20150415T204310Z DESCRIPTION:Speaker Name: David Miller\n\nSpeaker Institution : University of Chicago\n\nTitle : "Boosting New Physics Searches Using Jets and Calorim etry at the Energy Frontier of Particle Physics"\n\nAbstract : The Large Ha dron Collider has already uncovered the Higgs boson and the ATLAS and CMs e xperiments are continuing their searches for signatures of completely new p hysics at the energy frontier of science. I will present new results in th e search for new fundamental particles using new techniques for sifting thr ough the data collected primarily by the calorimeters of the ATLAS experime nt. These results use a novel technique involving "jets" in order to searc h for signs that new particles have indeed been produced in the proton-prot on collisions. In addition\, I will describe future prospects using these and other new methods for both precision measurements and new physics searc hes. In particular\, I'll introduce the new high-speed trigger system bein g built in part at Chicago that is specifically designed to find boosted ma ssive particles during the LHC Run 3 after some minor upgrades of the LHC a nd the ATLAS detector.\n LAST-MODIFIED:20150415T204421Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20141106T133000 DTEND;TZID=America/New_York:20141106T140000 RRULE:FREQ=WEEKLY;UNTIL=20141218T183000Z;BYDAY=TH EXDATE;TZID=America/New_York:20141204T133000 EXDATE;TZID=America/New_York:20141127T133000 EXDATE;TZID=America/New_York:20141218T133000 DTSTAMP:20260828T094430Z UID:94ak83mi2r1201afdoau1apa4c@google.com CREATED:20141030T161419Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/gatess?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXA uY2FsZW5kYXIuZ29vZ2xlLmNvbQ.94ak83mi2r1201afdoau1apa4c&hs=121 LAST-MODIFIED:20141030T161850Z LOCATION:Room 1305F\, the "new" Toll Room SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140313T200000Z DTEND:20140313T213000Z DTSTAMP:20260828T094430Z UID:8fac47ce6u718f3q52c3hdaumg@google.com CREATED:20140307T134414Z DESCRIPTION:Speaker Name: George Fleming\n\nSpeaker Institution:Yale Univer sity\n\nTitle: Compositeness and Physics Beyond the Standard Model\n\nAbstr act: The great discovery of a Higgs-like scalar boson around 126 GeV at t he Large Hadron Collider (LHC)\, along with an absence of evidence for TeV- scale supersymmetry (SUSY)\, has left the theoretical community struggling to find an answer to the hierarchy problem of the Standard Model Higgs boso n. A composite Higgs boson can naturally solve the hierarchy problem. It w ould be a great advance in theoretical physics to understand whether compos ite Higgs bosons can arise as pseudo-Nambu-Goldstone bosons (pNGB’s) in ce rtain confining gauge theories or as pseudo-dilatons in nearly conformal ga uge theories. Without TeV-scale SUSY and direct detection of dark matter a t XENON100 and LUX\, the ``WIMP miracle'' may now seem a coincidence\, but I will point out that there are still composite candidates that can fit the paradigm. LAST-MODIFIED:20140311T181216Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150223T160000Z DTEND:20150223T170000Z DTSTAMP:20260828T094430Z UID:mfhds5nq6gl4op8d40l3i6nb3c@google.com CLASS:PUBLIC CREATED:20150203T185455Z DESCRIPTION:Speaker Name: Dominik Zumbuhl\n\nSpeaker Institution: Universit y of Basel\n\nTitle: Spin Helices in GaAs Quantum Wells and Quantum Wires\n \nAbstract: This talk will cover two topics. First I will present evidence for helical nuclear spin order in GaAs cleaved edge overgrowth wires. The c onductance of the first mode is reduced from 2 e2/h down to 1 e2/h upon low ering temperature from 10 K to below 0.1 K\, suggesting lifting of the elec tron spin\ndegeneracy in the absence of B. Our results are consistent with theoretical predictions for helical nuclear magnetism in the Luttinger liqu id regime.\n\nSecond: The spin-orbit (SO) interaction is a crucial resource for spin-based quantum technologies\, but also causes spin decay by dephas ing and relaxation. In semiconductors\, it is possible to protect spins fro m decay by matching the Rashba and Dresselhaus fields\, creating the persis tent spin helix state. We report locking of the Rashba and Dresselhaus SO f ields to matching strengths while changing both together in this locked sta te with top and back gates\, providing a technique to manipulate spins whil e keeping them protected from decay. We employ the suppression of weak anti localization as sensitive detector for matched SO fields\, delivering all S O terms when combined with numerical simulations. These techniques are appl icable to various semiconductor materials and nanostructures. LAST-MODIFIED:20150219T125100Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141015T193000Z DTEND:20141015T203000Z DTSTAMP:20260828T094430Z UID:rdkeidplogeqsddj1ohtlt44ag@google.com CREATED:20141009T133730Z DESCRIPTION:Speaker Name: Dr. Alex Rimberg\n\nSpeaker Institution : Dartmou th\n\nTitle : Realization of a Single-Cooper-Pair Josephson Laser\n\nAbstra ct : The quantum interaction of light with matter\, long studied in the con text of atomic systems\, has recently been extended to condensed matter sys tems through the advent of quantum optical experiments based on superconduc ting circuits. Application of quantum optical techniques in this context h as led to new regimes of ultrastrong coupling between light and matter\, ma nipulation and readout of qubits\, generation of quantum states of light an d development of ultra-low-noise quantum amplifiers. A particularly famili ar application of quantum optics is the laser\, which in the single emitter regime has in atomic systems led to the production of pure photon number s tates and sub-Poissonian photon statistics. We have recently produced a de vice consisting of a Cooper pair transistor embedded in a high-Q supercondu cting microwave cavity (cCPT) that acts as a single emitter laser and may o ffer a path toward simple\, continual production of non-classical photons. Similar devices may also allow for ultrastrong coupling of microwave phot ons to other quantum systems such as spin qubits and nanomechanical resonat ors.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/lab-for?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdX AuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.rdkeidplogeqsddj1ohtlt44ag&hs=121 LAST-MODIFIED:20141009T133751Z LOCATION:Lab for Physical Sciences (downstairs conference room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141013T200000Z DTEND:20141013T210000Z DTSTAMP:20260828T094430Z UID:n70pfnbbp351vtcj8ickd836k8@google.com CREATED:20140922T154555Z DESCRIPTION:Speaker Name: Jose Feijo\n\nSpeaker Institution: University of Maryland\n\nTitle: Excitement on non-excitable cells: the biophysical natur e of cellular\n\nJoin with Google Hangouts: https://hangouts.google.com/han gouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3J vdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.n70pfnbbp351vtcj8ickd836k8&hs=121 LAST-MODIFIED:20140922T154936Z LOCATION:0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151028T200000Z DTEND:20151028T210000Z DTSTAMP:20260828T094430Z UID:qak97536rbq00lj2o2i69ku6io@google.com CREATED:20151028T180800Z DESCRIPTION:Speaker Name: Prof. Antoine Cerfon \n\nSpeaker Institution : Co urant Institute\, New York University\n\nTitle: Classical Fluid Instabilit ies in Cyclotron Beams \n\nAbstract: Our ability to design high power cyclo trons rests on a better understanding of the behavior of intense beams in t hese machines. Space charge effects\, i.e. effects associated with the self electric field\, play a major role in the beam dynamics but remain poorly understood. In this talk\, I will present two new continuum models for the description of space charge effects in cyclotron beams. Both models rely on the fact that the time scale for gyration around the center of the cyclotr on is much shorter than the space charge time scale. The first model assume s a low temperature\, space-charge dominated regime\, which leads to a drif t kinetics like description of the beam\, and eventually remarkably simple fluid equations. The second model allows for arbitrary large temperature\, thus covering the emittance dominated regime\, and leads to gyrokinetics li ke kinetic equations. Using these two models\, I will give intuitive explan ations based on classical fluid instabilities for!\n the behavior of beams observed in simulations and experiments\, including beam spiraling and bea m breakup.\n LAST-MODIFIED:20151028T180924Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131218T190000Z DTEND:20131218T200000Z DTSTAMP:20260828T094430Z UID:rc2v3ju22169p3vs4o0u5558qs@google.com CLASS:PUBLIC CREATED:20131216T185914Z DESCRIPTION:Speaker: James D. Whitfield\, Vienna Center for Quantum Science and Technology\n\nTitle: Complexity of Time-dependent density functional t heory\n\nAbstract:\nTime-dependent density functional theory (TDDFT) is rap idly emerging as a premier method for solving fermionic many-body problems in physics and chemistry. The mathematical foundations of TDDFT are establi shed through the formal existence of a fictitious non-interacting system (k nown as the Kohn-Sham system)\, which can reproduce the one-electron reduce d probability density of the actual system. We build upon previous works an d show that on the interior of the domain of existence\, the Kohn-Sham syst em can be efficiently obtained given the time-dependent density. We introdu ce a V-representability parameter which diverges at the boundary of the exi stence domain and serves to quantify the numerical difficulty of constructi ng the Kohn-Sham potential. The present work\, in addition to contributing to on-going research about the foundations of TDDFT\, is the latest applic ation of quantum computational complexity theory to a growing list of probl ems in the physics and chemistry community.\n LAST-MODIFIED:20131216T185914Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150518T200000Z DTEND:20150518T213000Z DTSTAMP:20260828T094430Z UID:qct808s4d2lmvp438oomk0t6lo@google.com CREATED:20150415T114144Z DESCRIPTION:Speaker: Matthew Dolan\n\nSpeaker Institution: SLAC\n\nTitle: F lavour constraints on pseudoscalar mediators.\n\nAbstract: Dark matter inte racting with the Standard Model via a light mediator can induce observable signals in indirect detection experiments and experience large self-interac tions\, while evading otherwise strong constraints from direct detection ex periments. However\, new light particles can induce new flavour-changing in teractions in the Standard Model\, opening alternative avenues to testing t hese models. In this talk I will present these constraints with a focus on light pseudoscalars. I will discuss the implications for explanations of th e DAMA annual modulation and Galactic Centre excess signals.\n\nJoin with G oogle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept- seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.qct808s4d2lmvp438oomk0t6lo&hs=121 LAST-MODIFIED:20150511T210036Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141013T150000Z DTEND:20141013T160000Z DTSTAMP:20260828T094430Z UID:h05vm8flm7ldoic0390eudbn5o@google.com CREATED:20140711T171636Z DESCRIPTION:Speaker: Klaus Von Klitzing\n\nSpeaker Institution: Max Planck \, Stuttgart\n\nTitle: Stripes and Bubbles in Quantum Hall Systems\n\nAbst ract: The talk summarizes recent publications about NMR and compressibilit y measurements on GaAs/AlGaAs quantum Hall systems discussing the determin ation of the spin texture of the striped phase at half-filled Landau levels and the possible detection of a pinned Wigner lattice in the tails of Land au levels [1\,2] . In addition the formation of compressible and incompress ible stripes at the boundary of a quantum Hall system and their importance for the current flow will be reviewed since these edge channels play an imp ortant role in transport measurements on topological insulators and Aharono v-Bohm experiments and are often misinterpreted. \n\nHost: Sankar Das Sarm a\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ph ysics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXA uY2FsZW5kYXIuZ29vZ2xlLmNvbQ.h05vm8flm7ldoic0390eudbn5o&hs=121 LAST-MODIFIED:20141008T200421Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150319T173000Z DTEND:20150319T180000Z DTSTAMP:20260828T094430Z UID:c3mn00ipr87ha4bhe4kgh5bobc@google.com CREATED:20150312T195553Z LAST-MODIFIED:20150312T195730Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The "new" Toll Room\, Room 1305F\; John S. Toll Physics Bldg TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140303T183000Z DTEND:20140303T193000Z DTSTAMP:20260828T094430Z UID:o1ha6lf0k7bmeu840bogqqfudc@google.com CREATED:20140116T172638Z DESCRIPTION:Title: Sign Problems\, Fermion Bags and a New Origin for Fermio n Mass.\n\nSpeaker: Shailesh Chandrasekharan\, Duke\n\nAbstract: We discuss a new approach to solve fermion sign problems called\nthe fermion bag appr ocah. The idea is to collect fermion degrees\nof freedom within certain spa ce-time regions (called fermion bags)\nand sum only over fermion world line s within this region. The summation\nthen gives the Boltzmann weight of the fermion bag. There are many\ninteresting models where the fermion bag weig hts turn out to be positive.\nSign problems in many of these models could n ot be solved earlier\nwith traditional methods. In addition to solving new sign problems\, the\nfermion bag approach also provides insight into the ph ysics of fermion\nmass generation. For example\, it seems possible that mas sless fermions\ncan become massive not only through the formation of a ferm ion\ncondensate as usual\, but also through a new mechanism where the\nferm ion condensate remains zero. We provide numerical evidence for\nthe latter scenario in a three dimensional lattice Gross Neveu model. LAST-MODIFIED:20140226T143933Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160216T181500Z DTEND:20160216T193000Z DTSTAMP:20260828T094430Z UID:uic6lqgtkalflbvm9qk58gdd5o@google.com CREATED:20160211T182221Z DESCRIPTION:Speaker Name: John Williamson\n\nSpeaker Institution : Georgeto wn University\n\nTitle : Domains\, asymmetry and flip-flop: the statistical thermodynamics of a phase-separating lipid bilayer\n\nAbstract : Domain fo rmation and heterogeneity within lipid bilayer membranes is associated with a vast array of physiological roles - cell membranes contain\, among every thing else\, hundreds of lipid species. Simpler membranes composed of two o r three species allow modelling such domain formation\, and have their own engineering applications in drug delivery and synthetic biology. A phase-se parating lipid bilayer is an immensely rich object due to its separate\, ye t coupled\, leaflets. Experiments pose questions about the nature of inter- leaflet interactions\, the symmetry or otherwise of domains\, and the role of "flip-flop" or direct inter-leaflet exchange. I show how a semi-microsco pic model of a phase-separating bilayer can provide valuable theoretical in sight. Distantly related to the Ising model\, it can be analytically solved to yield coarse-grained free energy. Phase behaviour and kinetics can then be predicted in a thermodynamic framework that properly treats the distinc t ! leaflets and\, unlike purely phenomenological approaches\, "knows about " the bilayer microstructure. After surveying data and observations from th e literature\, I will outline how our theory unifies apparently disparate o r contradictory findings\, and predicts novel phenomena. \n\nNotes: By trad ition\, each seminar is preceded by an informal cafeteria lunch to which al l are welcome\, departing from Room 1108 about five minutes after 12:00 noo n. LAST-MODIFIED:20160211T182221Z LOCATION:IPST Building Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130429T154500Z DTEND:20130429T163000Z DTSTAMP:20260828T094430Z UID:simqvkehtdnnd65s7dho1pnsqo@google.com CREATED:20130425T175111Z LAST-MODIFIED:20130425T175118Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150330T200000Z DTEND:20150330T210000Z DTSTAMP:20260828T094430Z UID:btavig54s8t0m6inp5etmgu1sk@google.com CREATED:20150304T180327Z DESCRIPTION:Speaker Name: Tom Angelini\n\nSpeaker Institution : University of Florida\n\nTitle: TBA\n\n LAST-MODIFIED:20150304T180327Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140217T183000Z DTEND:20140217T193000Z DTSTAMP:20260828T094430Z UID:j27jmj26ueatfj6gsidi6ma5n0@google.com CREATED:20140116T172058Z DESCRIPTION:Title: Nambu-Goldstone fermion in hot QED/QCD plasma and Bose-F ermi Cold Atom System\n\nSpeaker: Daisuke Satow\, Brookhaven\n\nAbstract: I t was suggested that supersymmetry (SUSY) is broken at finite temperature\, and as a result\, a Nambu-Goldstone fermion (goldstino) related to SUSY ap pears. Since dispersion relations of quarks and gluons are almost degenerat e at extremely high temperature\, quasi-zero energy quark excitation was su ggested to exist though QCD does not have exact SUSY. As for the condensed matter system\, a setup of cold atom system in which the Hamiltonian has SU SY was proposed\, the goldstino was suggested to exist\, and the dispersion relation of that mode at zero temperature was obtained recently.\nIn this talk\, we obtain the expressions for the dispersion relation of the goldsti no in cold atom system at finite temperature\, and compare it with the disp ersion of the quasi zero-mode in QCD.\nFurthermore\, we show that the form of the dispersion relation of the goldstino can be understood by using an a nalogy with a magnon in ferromagnet.\nWe also discuss on how the dispersion relation of the goldstino is reflected in observable quantities in experim ent. LAST-MODIFIED:20140116T172111Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160323T173000Z DTEND:20160323T190000Z DTSTAMP:20260828T094430Z UID:k91smb60glgodmt9blmeb9rjq0@google.com CREATED:20160303T190237Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART I (March 21\, 22\, 23) will center on the concept of "entanglement entropy" in field theory\, a measure of the information i n a region. I will describe how to calculate this quantity by various tric ks (including holographic methods)\, and spell out some applications to ren ormalization theory\, condensed matter physics\, and quantum gravity. LAST-MODIFIED:20160303T190237Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150204T180000Z DTEND:20150204T193000Z DTSTAMP:20260828T094430Z UID:700m8mfv3t144j76dqs4cncr2s@google.com CREATED:20150127T172855Z DESCRIPTION:Title: The EOS of neutron matter\, and the effect of Lambda hyp erons to neutron star structure\n\nSpeaker: Stefano Gandolfi\, Los Alamos N ational Lab\n\nAbstract: Recent advances in experiments of the symmetry ene rgy of nuclear\nmatter and in neutron star observations yield important new insights\non the equation of state of neutron matter at nuclear densities. \nIn this regime the EOS of neutron matter plays a critical role in\ndeterm ining the mass-radius relationship for neutron stars. We show how\nmicrosco pic calculations of neutron matter\, based on realistic two- and\nthree-nuc leon forces\, make clear predictions for the relation between the\nisospin- asymmetry energy of nuclear matter and its density dependence\,\nand the ma ximum mass and radius for a neutron star.\n\nOn the other side\, several mi croscopic calculations suggested that the\ninclusion of hyperons softens th e EOS such that the corresponding maximum\nmass of neutron stars is much lo wer that astrophysical observations.\nWe will show that very small changes in the nucleon-nucleon-Lambda interactions\nhave a dramatic role to the EOS \, while hypernuclei are quite insensitive to\nthe same adjustments. LAST-MODIFIED:20150129T180852Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150202T210000Z DTEND:20150202T220000Z DTSTAMP:20260828T094430Z UID:3cegf0j3ur0omm10t730kbb4d0@google.com CREATED:20150130T205705Z DESCRIPTION:Speaker Name: Min Zhao\n\nSpeaker Institution : UC-Davis\n\nTit le : Electrical Control of Cell Migration in Wound Healing.\n\nAbstract: W ounds naturally generate weak direct current electric fields. We study how this type of electrical signals may regulate cell behavior during wound hea ling. This type of physiological electric fields/currents provides a powerf ul cue to induce polarized activation of intracellular signaling pathways a nd directional migration of cells. The guidance effect may override other w ell accepted directional signals such as contact inhibition release\, chemo taxis and mechanical forces following injury. We aim to understand how the electrical signals are produced\, what mechanisms the very weak electric fi elds guide cell migration\, and to develop technology to exploit this uniqu e signal to facilitate wound healing. LAST-MODIFIED:20150130T215320Z LOCATION:0112 Chemistry Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140127T200000Z DTEND:20140127T210000Z DTSTAMP:20260828T094430Z UID:8a5mo1u4jsuhqvla0fo2h8rqc8@google.com CREATED:20140116T164339Z DESCRIPTION:Title: Under the Lens of RPV: An Examination of the LHC Progra m\n\nSpeaker: Jared Evans\, Rutgers Univ.\n\nAbstract: R-parity violation i s touted as a way to maintain a natural MSSM while evading LHC bounds. By systematically exploring simplified models motivated by the RPV MSSM\, we c an uncover gaps in the current array of searches performed by the Atlas and CMS collaborations. This talk reviews the details of RPV signatures relev ant for colliders\, and presents recast limits on naturalness-motivated top ologies originating from pair-produced gluinos (in RPV and beyond)\, stops\ , and higgsinos. Many specific signatures which evade the current set of s earches are discussed along with both extensions to existing searches and e ntirely new search strategies which together can fill many of these weak po ints in coverage. LAST-MODIFIED:20140116T164339Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140226T183000Z DTEND:20140226T200000Z DTSTAMP:20260828T094430Z UID:ho40589me60b085t96ep7sj3po@google.com CREATED:20140116T173659Z DESCRIPTION:Title: Warped AdS3 black holes: classical stability and quantum field theory\n\nSpeaker: Hugo Ferreira\, Nottingham\n\nAbstract: (2+1)-dim ensional gravity allows us to study aspects of classical and quantum gravit y in a simpler technical setting which retains much of the conceptual compl exity of the standard (3+1)-dimensional gravity. However\, in 2+1 dimension s pure Einstein gravity is a topological theory. By adding a gravitational Chern-Simons term to the action\, one obtains Topologically Massive Gravity \, which is a deformation of GR which includes propagating degrees of freed om. Besides the famous BTZ black hole solution\, this theory has a whole ne w class of rotating black hole solutions -- the warped AdS3 black holes -- which can be viewed as deformed BTZ solutions but which\, counterintuitivel y\, are not asymptotically AdS -- they are actually (almost) asymptotically flat! This gives us a (2+1)-dimensional black hole which closely resembles the Kerr black hole in 3+1 dimensions.\n\nIn this talk\, I will describe t he issues of mode stability and quantum field theory of this interesting se t of solutions. First\, I will show that\, in contrast with the Kerr black hole\, the warped AdS3 black hole is classically stable to massive scalar f ield perturbations\, by analysing its mode stability. Finally\, I will repo rt on current progress on the Hadamard renormalisation of the stress-energy tensor of a scalar field in the Hartle-Hawking vacuum. When finished\, thi s work will provide the first calculation of this kind for a rotating black hole with asymptotics which resemble asymptotically flat spacetimes.\n\nPa rt of this work has been published in Phys. Rev. D 87\, 124013 (2013). LAST-MODIFIED:20140221T151318Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141022T193000Z DTEND:20141022T203000Z DTSTAMP:20260828T094430Z UID:t3no8oi1rlb7d5rrvc5ntf4gns@google.com CREATED:20141016T174254Z DESCRIPTION:Speaker Name: Dr. Jongmin Lee\n\nSpeaker Institution : Joint Qu antum Institute (UMCP)\n\nTitle: Collective Atom-Photon Interactions with N anophotonics and Cavity QED\n\nAbstract: The nanofiber-based optical lattic es have been demonstrated for 87Rb atoms using two-color evanescent optical trapping fields. We measured a trapped atom number via absorption measurem ent\, and we studied its asymmetric absorption profile and inhomogeneous Ze eman broadening. In addition\, the nanophotonic waveguide atom trap has bee n studied. Based on a silicon nitride waveguide coupler\, two-color 'travel ing' evanescent wave fields can trap cold neutral atoms like an optical dip ole trap. The potential performance and current research progress of silico n nitride optical waveguide atom trap will be addressed.\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/laborato ry-for?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.t3no8oi1rlb7d5rrvc5ntf4gns&hs=121 LAST-MODIFIED:20141017T172045Z LOCATION:downstairs conference room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar Announcement TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150325T193000Z DTEND:20150325T203000Z DTSTAMP:20260828T094430Z UID:phg1qobr7jqldr479c0r62mu5k@google.com CREATED:20150319T190123Z DESCRIPTION:Speaker Name: Dr. James Gates\n\nSpeaker Institution : UMCP\n\n Title: Think Different: Applying the Old MacIntosh Mantra to the Represent ation Theory of Supersymmetry\n\nAbstract : The conventional and traditiona l ways of investigating the representation theory of supersymmetry have bee n within the confines of relativistic quantum theories of fields and string s. This presentation discusses an array of new tools\, such as network and graph theory\, codes\, holoraumy\, and linear algebra\, that have been pro posed in the effort to create a more complete foundation.\n\nLPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overf low parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use t he phone on the left hand side of the front door to call the receptionist f or entry.\n\n LAST-MODIFIED:20150323T133204Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150807T160000Z DTEND:20150807T170000Z DTSTAMP:20260828T094430Z UID:jnql847ohtd0civt4jcllr7l74@google.com CLASS:PUBLIC CREATED:20150805T154227Z DESCRIPTION:Important Note: Free Lunch served at 11:45\, Refreshments serve d at 4:00pm.\n\nSpeaker: Dimitri Trypogeorgos\n\nTopic: Rotating cold atoms \n\nAbstract: The behaviour of rotating superfluids has been of fundamental interest since Kamerlingh Onnes liquified helium more than a century ago\, and fuelled Landau’s two-fluid description. With the advent of Bose Einste in Condensates\, these topics are revisited and the intimate link between s uperfluidity\, superconductivity and condensation is further investigated. This hydrodynamic description is not adequate for very fast rotating clouds . The system then enters the Lowest Landau Level and forms exotic ground st ates related to the Quantum Hall Effect. LAST-MODIFIED:20150805T154227Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141204T183000Z DTEND:20141204T190000Z DTSTAMP:20260828T094430Z UID:svjuh17tu6cnf5gndfbedmdlqk@google.com CREATED:20141126T232832Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/cnam-condensed?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTB AZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.svjuh17tu6cnf5gndfbedmdlqk&hs=121 LAST-MODIFIED:20141126T232832Z LOCATION:Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151210T183000Z DTEND:20151210T193000Z DTSTAMP:20260828T094430Z UID:398dcdk7qvlc0g8magi9mfjt04@google.com CREATED:20151207T200155Z DESCRIPTION:Speaker: Emily Pritchett\n\nSpeaker Affiliation: HRL\n\nTitle: Electically Controlled Qubits in Silicon\n\nAbstract: Quantum information p rocessing aims to leverage the properties of quantum mechanics to manipulat e information in ways that are not otherwise possible. This would enable\, for example\, quantum computers that could solve certain problems exponenti ally faster than a conventional supercomputer. One promising approach for b uilding such a machine is to use gated silicon quantum dots. In the approac h taken at HRL Laboratories\, individual electrons are trapped in a gated p otential well at the barrier of a Si/SiGe heterostructure. Spins on these e lectrons are compelling candidates for qubits due to their long coherence t ime\, all-electrical control\, and compatibility with conventional fabricat ion techniques. In this talk I will discuss the recent demonstration of all -electrical control of silicon-based qubits made from triple quantum dots i n isotopically purified material\, including methods to mitigate charge noi se. The results indicate a strong future for silicon-based quantum technolo gy. LAST-MODIFIED:20151210T162612Z LOCATION:3100A Computer and Space Sciences Building\, Bldg 224 Stadium Dr\, College Park\, MD 20742 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160120T160000Z DTEND:20160120T170000Z DTSTAMP:20260828T094430Z UID:ed2pfhhh7tj8hjo75bkh28kbho@google.com CREATED:20151204T151738Z DESCRIPTION:Speaker Name: Hao-Chung Cheng\n\nSpeaker Affiliation: Universit y of Technology\, Sydney\n\nTitle: Exponential Decay of Matrix \\Phi-Entrop ies on Markov Semigroups with Applications to Dynamical Evolutions of Quant um Ensembles\n\nAbstract: In the study of Markovian processes\, one of the principal achievements is the equivalence between the \\Phi-Sobolev inequal ities and an exponential decrease of the\\ Phi-entropies. In this work\, we develop a framework of Markov semigroups on matrix-valued functions and ge neralize the above equivalence to the exponential decay of matrix \\Phi-ent ropies. This result also specializes to spectral gap inequalities and modif ied logarithmic Sobolev inequalities in the random matrix setting. To estab lish the main result\, we define a non-commutative generalization of the ca rre du champ operator\, and prove a de Bruijn's identity for matrix-valued functions.\n\nThe proposed Markov semigroups acting on matrix-valued functi ons have immediate applications in the characterization of the dynamical ev olution of quantum ensembles. We consider two special cases of quantum unit al channels\, namely\, the depolarizing channel and the phase-damping chann el. In the former\, since there exists a unique equilibrium state\, we show that the matrix Phi-entropy of the resulting quantum ensemble decays expon entially as time goes on. Consequently\, we obtain a stronger notion of mon otonicity of the Holevo quantity - the Holevo quantity of the quantum ensem ble decays exponentially in time and the convergence rate is determined by the modified log-Sobolev inequalities. However\, in the latter\, the matrix Phi-entropy of the quantum ensemble that undergoes the phase-damping Marko vian evolution generally will not decay exponentially. This is because ther e are multiple equilibrium states for such a channel.\n\nFinally\, we also consider examples of statistical mixing of Markov semigroups on matrix-valu ed functions. We can explicitly calculate the convergence rate of a Markovi an jump process defined on Boolean hypercubes\, and provide upper bounds of the mixing time on these types of examples. (arXiv:1511.02627) LAST-MODIFIED:20160107T214615Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T180000Z DTEND:20140512T190000Z DTSTAMP:20260828T094430Z UID:qv3i6nrfmkpgj6n8fen8b42ffo@google.com CREATED:20140507T134151Z DESCRIPTION:Speaker Name: Huaixiu Zheng\n\nSpeaker Institution: Duke Univer sity\n \nTitle: Open Quantum Systems: Interplay between the Nano- and Macr o- Worlds \n\nAbstract: The spectacular progress in manipulation of quantum states of matter in the past decades has stimulated a lot of interests in open quantum systems. In this talk\, I will cover my recent work on the int erplay between the environment and individual quantum objects in two open s ystems: 1) interacting photons in waveguide-QED systems\, and 2) Majorana q uantum critical behavior of a resonant level coupled to a dissipative envir onment. Photon-photon ″bound states″ emerge in a one-dimensional waveguide as a result of the strong coupling to a two-level system. Recent experimen ts have observed the key signature of those bound state: bunching in the se cond-order correlation function. Furthermore\, I will introduce a two-qubit waveguide-QED system which allows us to access non-Markovian physics in ph oton-photon correlations. In a dissipative resonant level\, a quantum phase transition is observed experimentally\, and the scaling laws at the quantu m critical point (QCP) are accounted for theoretically by mapping to a Lutt inger liquid paradigm. By fine-tuning the system\, an anomalous non-Fermi-l iquid temperature dependence at the QCP is uncovered\, indicating fractiona lization of the resonant level into two Majorana quasiparticles.\n\nHost: J ake Taylor\n LAST-MODIFIED:20140507T202720Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140728T180000Z DTEND:20140728T190000Z DTSTAMP:20260828T094430Z UID:bvrch7bn2cqg00q52663ndnllg@google.com CREATED:20140717T150027Z DESCRIPTION:Speaker Name: Dr. André Eckardt\n\nSpeaker Institution: Max-Pla nck-Institut\n\nTitle: Topological insulators in optical lattices and their tomography\n\nAbstract: Band insulators constitute a fascinating form of q uantum matter. Their very existence relies on band structure and quantum st atistics\, and the geometric phase inherent in their wave function gives ri se to\, e.g.\, a quantized Hall conductance (topological insulator) or quan tized matter transport in adiabatic cycles (topological charge pumping). Af ter an introduction\, I will compare different schemes for the realization of topological insulators in optical lattices that are based on periodic dr iving. In the second part I will then present a method for the complete tom ography of (topological) band insulators in optical lattices with two subla ttice states.\n\nHost: Brandon Anderson\n\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/jqi?hceid=bGJrNjYwYTc1Y jhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.bvrch7bn2cqg00q52 663ndnllg&hs=121 LAST-MODIFIED:20140721T152037Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141105T160000Z DTEND:20141105T210000Z DTSTAMP:20260828T094430Z UID:ig3glvml6undhpm0j33a1s9c8o@google.com CREATED:20141020T213630Z DESCRIPTION:Talk schedule:\n\n11:00 AM Pallab Goswami\, Axial anomaly and negative longitudinal magnetoresistance: theory vs. experiment\n\n11:45 AM Alejandro Lobos\, Magnetic edge-states in strongly interacting one-dimensi onal topological Kondo insulators\n\n1:30 PM Jed Pixley\, Unconventional S uperconductivity near a Kondo Destroyed Quantum Critical Point\n\n2:15 PM Jimmy Williams\, Quantum Nanoelectronics in Oxides\n\n3:00 PM Vlad Manucha ryan\, Single Cooper pair proximity effect in mesoscopic quantum dots\n\nTh e entire talk schedule can be found at http://www.physics.umd.edu/cmtc/semi nars.html LAST-MODIFIED:20141020T213630Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140514T200000Z DTEND:20140514T210000Z DTSTAMP:20260828T094430Z UID:57oqcfj9icrba57kn21viiccoo@google.com CREATED:20140502T143816Z DESCRIPTION:Speaker Name: Dr. Kimberly J. Palladino\n\nSpeaker Institution : SNOLAB\n\nTitle: DEAP and CLEAN: Direct Dark Matter Searches and Single Phase Liquid Argon Detectors\n\nAbstract: Evidence for the existence of Da rk Matter from astronomical observations abounds\, while experimentalists a re still in pursuit of a confirmed laboratory 'direct' detection. Currentl y\, contradictory experimental results of allowed signal regions and exclud ing upper limits exist\, which may leave many observers of the field scratc hing their heads. MiniCLEAN and DEAP-3600 are single-phase liquid argon exp eriments for the direct detection of dark matter under construction at SNOL AB\, located 6800 feet underground in an active nickel mine in Sudbury\, On tario. The implications of their unique design will be discussed in the con text of the wider search for dark matter. LAST-MODIFIED:20140502T143816Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141003T170000Z DTEND:20141003T210000Z DTSTAMP:20260828T094430Z UID:q3fev6dd0e00qllp183o2n10pk@google.com CREATED:20140924T144247Z DESCRIPTION:JSI Mini-Symposium\n"New JSI Scientists Jamboree"\nDate: Friday \, October 3\, 2014\nTime: 1:00 PM - 5:00 PM (Lunch available beginning at 12:00 pm in the concourse area outside of CSS Rm. 2400)\nLocation: Room 240 0 Computer and Space Sciences Building\n\n- Andrew W. Smith (UMD Physics) - - "Gamma-ray Astronomy: A Window into Galactic Particle Acceleration"\n- Ka ren Yang (UMD Astronomy) -- "The Fermi Bubbles: Possible Nearby Laboratory for AGN Jet Activity"\n- Andrew J. Smith (UMD Physics) -- "HAWC Begins"\n- Brian Morsony (UMD Astronomy) -- "Simulating Astrophysical Jet Interactions "\n- Jane Dai (UMD Physics) -- "Numerical Studies on Tidal Disruption Event s"\n- DJ Pasham (UMD Astronomy) -- "A 400 Solar Mass Black Hole Revealed Wh ile Mimicking a Stellar-mass Black Hole"\n- Sebastien Heinis (UMD Astronomy ) -- "The Search for the Highest Redshift Quasars with the Pan-STARRS1 Surv ey"\n- Brandon Bozek (UMD Astronomy) -- "Constraints on Axion Dark Matter"\ n\n There will be a break mid-way between talks with snacks and beverages.\ n\nhttp://jsi.astro.umd.edu/upcoming-mini-symposium\n\nJoin with Google Han gouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jsi-mini?hcei d=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.q3 fev6dd0e00qllp183o2n10pk&hs=121 LAST-MODIFIED:20140924T144247Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium – “New JSI Scientists Jamboree” TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141201T200000Z DTEND:20141201T213000Z DTSTAMP:20260828T094430Z UID:7j6kp0jai7oigibnm4jmi4k02o@google.com CREATED:20140819T180034Z DESCRIPTION:Title: Leptophilic New Physics: Dark Matter and the Muon g-2\n\ nSpeaker: Susanne Westhoff\, University of Pittsburgh\n\nAbstract: New heav y particles that couple only to leptons may explain the observed discrepanc y in the muon anomalous magnetic moment\, g-2. I discuss how the LHC can pr obe such new particles in direct production. Leptophilic particles are also promising candidates of dark matter\, since they evade constraints from sc attering off nuclei. I show that LEP constraints from loop-induced four-lep ton interactions are comparable or superior to mono-photon searches. At a f uture electron-positron collider\, lepton interactions can reveal details a bout the scale and structure of dark sectors.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=b GJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7j6kp 0jai7oigibnm4jmi4k02o&hs=121 LAST-MODIFIED:20141118T145315Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120217T180000Z DTEND:20120217T190000Z DTSTAMP:20260828T094430Z UID:lsld5ln44hj5jeov8h8ubk02tg@google.com CREATED:20120127T181159Z DESCRIPTION:Title : Challenges In 1D Growth of Zinc Oxide Nanocrystals and Their Device Integration\nSpeaker Name: Babak Nikoobakht\nSpeaker Instituti on : Surface and Interface Research Group\, NIS\nAbstract : With more than a decade of intensive work and great progress on one dimensional (1D) nanoc rystals\, there are still major barriers in their integration into devices for real applications. Two key issues are variation in properties of nanowi res i an ensemble and control over their large scale order. In studying the ir properties\, measurements have been typically carried out on individual nanowires\; statistical measurements on large nanowire populations are lack ed and the extent of property variation is not well studied. In the case of zinc oxide and other semiconductors with applications in opto-electronic d evices such as light sources\, the electro-optical results show a considera ble fluctuation over the ensemble that is due to the type and distribution of the defects. Another issue that will be discussed is progress in precisi on control of the hierarchy of nanowires. There is a growing need for disco vering alternative paradigms for low cost device miniaturization as \ntop-d own approaches are becoming more expensive. For nanowires\, the basic quest ion is how millions of them can be interfaced in very specific locations an d with specific functions. In this presentation I will show how the two key issues above can be closely related to the more fundamental issue of contr olled growth of nanowires. To this end\, a surface –directed nanocrystal gr owth method will be discussed\, which is similar to the vapor-liquid-solid process but offers some new benefits. Results will also be presented on ext ension of this method to other II-VI and III-V semiconductors\, their cryst al structure as well as their growth direction engineering. LAST-MODIFIED:20120127T181312Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141104T181500Z DTEND:20141104T193000Z DTSTAMP:20260828T094430Z UID:ag0qbkavb14bnd7c95q04tdqk8@google.com CREATED:20141029T135122Z DESCRIPTION:Speaker Name: Mr. Zhiyue Lu\n\nSpeaker Institution : UMCP\n\nTi tle : An Integral Method to Compute Helmholtz Free Energies of Crystalline Solids.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/ _/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY 2FsZW5kYXIuZ29vZ2xlLmNvbQ.ag0qbkavb14bnd7c95q04tdqk8&hs=121 LAST-MODIFIED:20141029T135308Z LOCATION:1116 IPST Building\, Bldg. 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141119T180000Z DTEND:20141119T193000Z DTSTAMP:20260828T094430Z UID:99boaspstqnh29q25i54b6k0ps@google.com CREATED:20141015T132228Z DESCRIPTION:Title: Emergent fermionic symmetries in large N gauge theories\ n\nSpeaker: Aleksey Cherman\, University of Minnesota\n\nAbstract: There ar e famous no-go theorems restricting the possible fermionic symmetries of in teracting four-dimensional quantum field theories to be some variant of sup ersymmetry. However\, these theorems do not directly apply to the large N limit of confining gauge theories\, since at large N such systems become fr ee theories in terms of their physical degrees of freedom\, the hadrons. I will describe the accumulating recent evidence for the conjecture that a p articularly interesting family of manifestly non-supersymmetric theories\, QCD with adjoint (rather than fundamental representation) massless quarks\, should have emergent fermionic symmetries in the large N limit. \n\nJoin w ith Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu /nuclear-physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5k YXIuZ29vZ2xlLmNvbQ.99boaspstqnh29q25i54b6k0ps&hs=121 LAST-MODIFIED:20141110T183241Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140917T193000Z DTEND:20140917T203000Z DTSTAMP:20260828T094430Z UID:jo941ec2ltvvf95pl6e4tmpr70@google.com CREATED:20140910T131004Z DESCRIPTION:Speaker Name: Dr. Mohammad Hafezi\n\nSpeaker Institution : ECE Department UMD\n\nTitle: Chiral edge state of photons and its potential app lications\n\nAbstract: Electronic transport through a disordered medium le ads generically to localization\, where conductance drops exponentially wit h system size even at zero temperature. The presence of gauge fields leads to fundamental changes in transport properties of electrons. The hallmark e xample is the emergence of chiral edge states in two-dimensional systems wi th strong perpendicular magnetic field.\n\nRecently\, it was proposed that gauge fields can be synthesized in photonic systems. In this talk\, I repor t on the first observation of chiral edge states of photons using silicon p hotonics. These states are topologically robust\, in direct analogy to elec tronic systems. We show how a photonic system with localized transport in t he bulk has robust transport along its edge. By developing statistics over different devices\, we can confirm the suppression of localization in edge states. Furthermore\, I discuss how similar physics can be observed in the microwave domain using circuit-QED architecture. The addition of nonlineari ty to such photonic systems with synthetic gauge fields could lead to the g eneration of quantum many-body states similar to that of the fractional qua ntum Hall effect in electronic systems. I describe various schemes to prepa re and detect such states. Such systems provide a new platform for investig ating the transport properties of photons in the presence of synthetic gaug e fields with potential applications in quantum simulation and fault-tolera nt quantum computation.\n\ncontact: wijohns@umd.edu for more information\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.jo941ec2ltvvf95pl6e4tmpr70&hs=121 LAST-MODIFIED:20140911T175544Z LOCATION:Laboratory for Physical Sciences SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Weekly Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141015T210000Z DTEND:20141015T220000Z DTSTAMP:20260828T094430Z UID:jr3pd04m1r5d597q008gfmcs0s@google.com CREATED:20141010T171014Z DESCRIPTION:Speaker Name: William Parker\n\nSpeaker Institution : Universit y of Wisconsin\n\nTitle : Differential Measurement of the W+W- Production C ross Section and Search for the Standard Model Higgs Boson in Events with A ssociated Jets in ppbar Collisions\n\nAbstract: The measurement of W boson pair production is an important test of the electroweak gauge sector of the standard model (SM) of particle physics. Extending the measurement to incl ude the properties of associated jets is a further test of quantum chromody namics that has not been performed before in events with multiple heavy gau ge bosons. This process is also a significant background for Higgs boson st udies in the W+W- decay mode at particle colliders where the use of jet vet os and jet counting is an essential element of the analysis technique. I wi ll discuss the search for a Higgs boson decaying to two W bosons\, focusing on events with two or more jets\, and present a new CDF W+W- cross section measurement. The cross section has been measured inclusively and different ially as a function of jet energy and multiplicity\, compared to current fi xed order and next to leading order Monte Carlo predictions. This is the fi rst measurement of associated jet properties in a massive diboson state\, u niquely possible at the Tevatron due to reduced top quark pair production b ackground relative to the LHC.\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/high-energy?hceid=bGJrNjYwYTc1Yjhq aDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jr3pd04m1r5d597q008g fmcs0s&hs=121 LAST-MODIFIED:20141013T153030Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140115T160000Z DTEND:20140115T170000Z DTSTAMP:20260828T094430Z UID:c9p78tacec832bs3e43a682h3s@google.com CLASS:PUBLIC CREATED:20140102T145345Z DESCRIPTION:Speaker: Gorjan Alagic\n\nInstitution: Institute for Quantum In formation and Matter\, California Institute of Technology\n\nTitle: Circuit obfuscation and topological quantum computation\n\nAbstract: A circuit obf uscator is an algorithm that accepts a circuit as input\, and outputs a fun ctionally-equivalent similarly-sized circuit which is "unintelligible." Fin ding a good obfuscator is a major problem in computer science. Besides thei r obvious applications to software protection\, obfuscators can also be use d to create public-key cryptosystems and homomorphic encryption. In this ta lk\, I will discuss the problem of obfuscating quantum computations. I will outline some basic problems in this area\, and then describe a simple and natural candidate obfuscator for topological quantum computation. I will al so mention some possible future directions related to testing small quantum computers. No background in cryptography or obfuscation is assumed. This i s based on joint work with Stacey Jeffrey and Stephen Jordan.\n LAST-MODIFIED:20140103T172018Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141020T200000Z DTEND:20141020T213000Z DTSTAMP:20260828T094430Z UID:rkejgadr9q4k04igs22lh4rauo@google.com CREATED:20141015T201945Z DESCRIPTION:Title: "Beginnings of Black Hole Physics"\n\nSpeaker: C.V. Vish veshwara\, Indian Institute of Astrophysics\n\nAbstract: The black-hole sag a began nearly a century ago with Schwarzschild’s derivation of the first s olution to Einstein’s field equations of general relativity immediately aft er the formulation of the theory in 1915. At the time\, the apparent singul ar behaviour of space-time at the Schwarzschild radius\, identified now wit h the black-hole event horizon\, was an enigma to physicists including Eins tein. The black hole lay more or less dormant till the 1960s and the early 1970s\, when there was a flurry of activity in the study of the basic prope rties of both the static Schwarzschild- and the rotating Kerr black holes. The talk will outline the history of this early phase and the salient featu res of black-hole physics including the work that was carried out at UMD. T he talk will be non-technical and aimed at a general audience.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/as trophysics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ2 9vZ2xlLmNvbQ.rkejgadr9q4k04igs22lh4rauo&hs=121 LAST-MODIFIED:20141017T180321Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130617T190000Z DTEND:20130617T200000Z DTSTAMP:20260828T094430Z UID:b8r4g3i7g3g9gv5qkj9srpggqo@google.com CREATED:20130610T193126Z DESCRIPTION:Speaker: Greg Sullivan\nInstitution: University of Maryland\nTi tle: TBA\nAbstract: TBA LAST-MODIFIED:20130610T193340Z LOCATION:4102 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20151001T180000Z DTEND:20151001T193000Z DTSTAMP:20260828T094430Z UID:1m4uvcdvil041kgttj6s9lrlfc@google.com CREATED:20150803T144804Z DESCRIPTION:SPEAKER: Shane Cybart\, UC San Diego\n\nTITLE: Direct-write He lium Ion Lithography of YBa2Cu3O7 Nano Josephson junctions and SQUIDs \n\nA BSTRACT: The 1986 discovery of high transition temperature (high-TC) superc onductivity in copper-oxide materials set in motion an intense research eff ort to develop superconducting electronics functioning in the range of liqu id nitrogen temperatures (77 K). Scientists and engineers soon after discov ered that these materials were much more difficult than initially imagined. Anisotropic electrical properties and a very short superconducting coheren ce length seriously narrowed or eliminated the possibility of using existin g fabrication techniques of conventional superconductors. These new materia ls demanded novel device architectures that proved very difficult to realiz e. Nearly three decades have passed and progress in high-TC superconducting devices has been very slow because process control at the sub ten nanomete r scale is required to make high-quality\, reproducible Josephson junctions : the basic building block of superconducting electronics. Recent advances in gas field focused helium ion beams provide a new and promising approach for direct-write lithography of high-TC materials for the realization of pr edictable and scalable high-TC electronics. \nI will describe how my labora tory uses a 0.5 nm diameter focused helium beam to directly write Josephson barriers into the a-b plane of a YBa2Cu3O7−δ (YBCO) superconducting thin f ilm. The key to this method is that YBCO is sensitive to point defects in t he crystal lattice caused by ion irradiation. Increasing irradiation levels has the effects of increasing resistivity and reducing the superconducting transition temperature. At very high irradiation levels YBCO becomes insul ating and no longer superconducts. The very small size of the barrier creat ed using a focused helium beam allows us to create junctions with higher ba rriers than previously possible which allows for insulating barriers and hi gher resistance devices. I will present data showing how the Josephson barr ier goes through the metal to insulator transition with increasing irradiat ion dose\, and discuss a modified restively shunted junction model that des cribes our data. I will conclude with a discussion about how the helium ion direct-write method enables for novel experiments in nanoscale Josephson j unctions and studies of the in-plane anisotropy of the superconducting orde r parameter symmetry.\n\nHOST: Ben Palmer LAST-MODIFIED:20150923T185932Z LOCATION:John S Toll Physics Bldg.\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Shane Cybart\, UC San Diego TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141119T230000Z DTEND:20141120T000000Z DTSTAMP:20260828T094430Z UID:17p45t8vu2dsq3or0r831qn5e0@google.com CREATED:20141113T213529Z DESCRIPTION:"The Day The Earth Stood Still"\n\nMovie and discussion. \n\nOn Wednesday\, Dec. 3\, Steve Fetter will host "Dr. Strangelove" in the PSC l obby at 6 pm.\n\nJoin with Google Hangouts: https://hangouts.google.com/han gouts/_/physics.umd.edu/science-cinema?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0am Z1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.17p45t8vu2dsq3or0r831qn5e0&hs=121 LAST-MODIFIED:20141113T213529Z LOCATION:PSC lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Science Cinema with Jim Gates TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160201T210000Z DTEND:20160201T223000Z DTSTAMP:20260828T094430Z UID:c90jopppoic2i172nciiadqpe8@google.com CREATED:20160127T173940Z DESCRIPTION:Speaker Name: Surjeet Rajendran\n\nSpeaker Institution: UC Berk eley\n\nTitle: New Directions in Searching for the Dark Universe\n \nAbstra ct: In this talk\, we discuss ways to search for a wide variety of ultralig ht bosonic dark matter using precision instruments and probes of ultramassi ve dark matter using astrophysical probes such as exploding white dwarfs. LAST-MODIFIED:20160129T194836Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140429T171500Z DTEND:20140429T183000Z DTSTAMP:20260828T094430Z UID:psf71en4jp6e2ijek0ecbvf6fo@google.com CREATED:20140421T140940Z DESCRIPTION:Speaker Name: Professor Jan Sengers\n\nSpeaker Institution : Un iversity of Maryland\, College Park\n\nTitle : Thermal Fluctuations in None quilibrium Thermodynamics: A Continuing Saga\n LAST-MODIFIED:20140421T140940Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140428T180000Z DTEND:20140428T190000Z DTSTAMP:20260828T094430Z UID:tlp7eu7es68j94l956pig4hka8@google.com CREATED:20140423T151618Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: Exotic Higgs Sectors\n\nSpeaker: David Curtin\, Stonybrook\n\ nAbstract: I review the LHC road map for using the higgs discovery as a pos sible gateway to discovering BSM physics. There is a clear opportunity for discovery that has so far been under-utilized\, which is the study of exoti c higgs decays. We have recently published a large survey document to help guide a systematic experimental effort searching for these signatures. I di scuss the extensive theory motivation for such a program\, as well as disco very reach in many different channels. There are many searches that are par ticularly motivated using early LHC run 1 data.\n LAST-MODIFIED:20140425T171601Z LOCATION:Rm. 462 Bloomberg Hall\, John's Hopkins University SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T150000Z DTEND:20140331T163000Z DTSTAMP:20260828T094430Z UID:4ho27kto0t87p9g2vbi787hppo@google.com CLASS:PUBLIC CREATED:20140102T150009Z DESCRIPTION:Speaker: Zoran Hadzibabic\n\nInstitution: University of Cambrid ge\n\nTitle: Uniform Bose gases\n\nAbstract: For almost two decades harmon ically-trapped ultracold atomic gases have been used with great success to study fundamental many-body physics in a flexible experimental setting. Rec ently\, we achieved the first atomic Bose-Einstein condensate in an essenti ally uniform potential of an optical-box trap [1]. This opens unprecedented possibilities for closer connections with other many-body systems and the textbook models that rely on the translational symmetry of the system. I wi ll present our first experiments on this new system\, including the first o bservation of the quantum Joule-Thomson effect [2]\, which was theoreticall y predicted more than 70 years ago.\n\n[1] A. L. Gaunt et al.\, Phys. Rev. Lett. 110\, 200406 (2013)\n[2] T. F. Schmidutz et al.\, Phys. Rev. Lett. 11 2\, 040403 (2014) \n\nHost: Gretchen Campbell LAST-MODIFIED:20140324T141851Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160211T203000Z DTEND:20160211T220000Z DTSTAMP:20260828T094430Z UID:1ac368a3uvclv88vqskemc0vo4@google.com CREATED:20160209T191835Z DESCRIPTION:Speaker: Paul Green (UMCP) - \n LAST-MODIFIED:20160209T191836Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Monodromy and mirror symmetry (cont.) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140129T183000Z DTEND:20140129T200000Z DTSTAMP:20260828T094430Z UID:8jriaj6iu5drtq83uke2t9ncq0@google.com CREATED:20140116T173428Z DESCRIPTION:Title: Surrogate models for effective one body gravitational wa veforms\n\nSpeaker: Scott Field\, UMD\n\nAbstract: Parameterized gravitatio nal wave models specified through ordinary differential equations often car ry large evaluation costs. These costs constitute a major bottleneck for ma ny important applications such as Bayesian parameter estimation which can r equire thousands or millions of model evaluations. In these multi-query con texts the cost per model evaluation dominates the overall simulation time. I will describe how surrogate models can be used to quickly evaluate an und erlying parameterized waveform model. Surrogate models are built by accumul ating model evaluations at a representative few parameter values and tying together these samples. This offline building stage needs to be performed o nly once\, while its subsequent online use is computationally inexpensive t o evaluate. I will show how surrogates can be used to speed up the generati on of effective one body waveforms by orders of magnitude without sacrifici ng accuracy. LAST-MODIFIED:20140127T140745Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151112T203000Z DTEND:20151112T220000Z DTSTAMP:20260828T094430Z UID:hbr3uqghmsb25bjr8gt8d4cl50@google.com CREATED:20151102T144619Z DESCRIPTION:Speaker: Matt Calkins (UMd)\nAbstract: We'll discuss the famous paper by A. Chamseddine and A. Connes\, The spectral action principle\, Co mm. Math. Phys. 186 (1997)\, no. 3\, 731-750. The idea is to show that a "n oncommutative space" (an algebra A playing the role of "functions on the sp ace"\, a Hilbert space H with a representation of A\, and a self-adjoint op erator (like the Dirac operator) "almost commuting" with A) naturally comes with a "spectral action"\, and that many physical theories arise this way. \n\n LAST-MODIFIED:20151102T144620Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The paper of Connes and Chamseddine on the spectral action principl e TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150604T173000Z DTEND:20150604T183000Z DTSTAMP:20260828T094430Z UID:l3lln1qamfh7t4gtr8kn2jt4dc@google.com CLASS:PUBLIC CREATED:20150601T134849Z DESCRIPTION:Speaker Name: Meera Parish\n\nSpeaker Institution: Monash Unive rsity \n\nTitle: Pairing in 2D Fermi gases\n\nAbstract: Quasi-two-dimension al Fermi systems are of both fundamental interest and technological importa nce\, with graphene and the high-temperature superconductors being classic examples. Recent advances in cold-atom experiments have now made it possibl e to investigate model quasi-2D Fermi gases in a controlled manner. In this talk\, I will discuss the different pairing regimes in the attractive Ferm i gas and how these can be dramatically modified by the finite transverse w idth of the quasi-2D system. In particular\, I will show that the critical temperature for pairing and superfluidity can be enhanced by relaxing the t ransverse confinement and perturbing away from the 2D limit\, thus raising the tantalising possibility that superfluidity is most favourable when the gas lies between 2D and 3D.\n\nReferences:\n[1] V. Ngampruetikorn\, J. Levi nsen & M. M. Parish\, Phys. Rev. Lett. 111\, 265301 (2013)\n[2] M. Bauer\, M. M. Parish & T. Enss\, Phys. Rev. Lett. 112\, 135302 (2014)\n[3] A. M. Fi scher & M. M. Parish\, Phys. Rev. B 90\, 214503 (2014) LAST-MODIFIED:20150603T194434Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Theoretical atomic and condensed matter physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140403T163000Z DTEND:20140403T173000Z DTSTAMP:20260828T094430Z UID:2esb1ageupvb6t8uv1nfdqk5ic@google.com CREATED:20140328T150128Z DESCRIPTION:Speaker Name: Dr. Marc A. Smith\n\nSpeaker Institution : Connec tion Action Consulting Group\n\nTitle : Charting Collections of Connections in Social Media: Creating Maps and Measures with NodeXL\n\nAbstract: Netw orks are a data structure commonly found across all social media services t hat allow populations to author collections of connections. The Social Med ia Research Foundation's NodeXL project makes analysis of social media netw orks accessible to most users of the Excel spreadsheet application. With N odeXL\, Networks become as easy to create as pie charts. Applying the tool to a range of social media networks has already revealed the variations pr esent in online social spaces. A review of the tool and images of Twitter\ , flickr\, YouTube\, and email networks will be presented. \n LAST-MODIFIED:20140328T150128Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140206T190000Z DTEND:20140206T203000Z DTSTAMP:20260828T094430Z UID:qva44l5u18770ap9mvf2lk5eqo@google.com CREATED:20140131T215711Z DESCRIPTION:CNAM Colloquium\nSpeaker: Andrew Rappe\, University of Pennsy lvania\n\nTitle: The bulk photovoltaic effect in polar oxides for robust a nd efficient solar energy \nharvesting\n\nAbstract:Solar energy is the most promising source of renewable\, clean energy to replace the current re liance on fossil fuels. Ferroelectric (FE) materials have recently attracte d increased attention as a candidate class of materials for use in photovol taic devices. Their strong inversion symmetry breaking due to spontaneous polarization allows for excited carrier separation by the bulk of the mater ial and voltages higher than the band gap (Eg)\, which may allow efficienci es beyond the Shockley-Queisser limit. Ferroelectric oxides are also robust and can be fabricated using low cost methods such as sol-gel thin film\nde position and sputtering. Recent work has shown how a decrease in ferroelec tric layer thickness and judicious engineering of domain structures and FE- electrode interfaces can dramatically increase the current harvested from F E absorber materials. Further improvements have been blocked by the wide b and gaps (Eg =2.7-4 eV) of FE oxides\,\nwhich allow the use of only 8-20% o f the solar spectrum and drastically reduce the upper limit of photovoltaic efficiency.\n\nIn this talk\, I will discuss new insight into the bulk pho tovoltaic effect\, and materials design to enhance the photovoltaic efficie ncy. We calculate from first principles the current arising from the "shif t current" mechanism\, and demonstrate that it quantitatively explains\nthe observed current. Then\, we analyze the electronic features that lead to strong photovoltaic effects. Finally\, we present new oxides that are stro ngly polar yet have band gaps in the visible range\, offering prospects for greatly enhanced bulk photovoltaic effects.\n\nHOST: Victor Yakovenko LAST-MODIFIED:20140203T153116Z LOCATION:PHYS room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151116T200000Z DTEND:20151116T213000Z DTSTAMP:20260828T094430Z UID:ukk48g0p41f720s6p68clu7010@google.com CREATED:20151104T174245Z DESCRIPTION:Speaker: Yue Zhao\n\nSpeaker Institution: University of Michiga n\, Ann Arbor\n \nTitle: Light Scalar Boson With No Symmetries\n \nAbstract : The AdS/CFT correspondence is applied to a close analogue of the little h ierarchy problem in AdS_{d+1} with d>2. The new mechanism requires a Maxwel l gauge field that gauges U(1)_R symmetry in a bulk supergravity theory wit h a negative cosmological constant. Supersymmetry is explicitly broken by a boundary term\, and the SUSY breaking deformation engendered is exactly ma rginal. SUSY breaking effects are computed exactly using the U(1) Ward iden tity. Conformal dimensions and thus masses of scalar and spinor partners ar e split simply because they carry different R-charges. However SUSY breakin g effects cancel to all orders for R-neutral fields\, even in diagrams with internal R-charged loops. SUSY breaking corrections can be explicitly calc ulated to all loop orders. Graviton loops do not introduce any further SUSY breaking corrections.\n\nJoin with Google Hangouts: https://hangouts.googl e.com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZq cjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ukk48g0p41f720s6p68clu7010&h s=121 LAST-MODIFIED:20151112T160125Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140528T200000Z DTEND:20140528T213000Z DTSTAMP:20260828T094430Z UID:2j46p4anrhd80s36avalqkbcao@google.com CREATED:20140509T163336Z DESCRIPTION:Speaker Name: Sriram Ganeshan\n\nTitle: "Fractional Majorana E xcitations in Abelian Quantum Hall States\nWith Gapless Protected Edges"\n\ nAbstract: TBA\n LAST-MODIFIED:20140529T202405Z LOCATION:PHYS 2205 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141022T200000Z DTEND:20141022T210000Z DTSTAMP:20260828T094430Z UID:niiddvv1uk5q87vuleue6qkl6c@google.com CREATED:20141016T153811Z DESCRIPTION:Speaker Name: Kristopher Klein\n\nSpeaker Institution : Univers ity of New Hampshire\n\nTitle: Identifying Solar Wind Turbulent Fluctuation s using Linear Kinetic Physics\n\nAbstract: Turbulence in magnetized plasma s is ubiquitous\, found in our Sun\, in the interplanetary solar wind\, and in more distant astrophysical environments. In this talk\, we model specif ic observable features of solar wind turbulence in terms of linear kinetic plasma fluctuations in an attempt to illuminate the nature of the underlyin g turbulent fluctuations. This is accomplished using a novel technique know n as the synthetic spacecraft data method which creates artificial time ser ies of electro-magnetic and density fluctuations based on theoretical model s for the turbulence using the eigenfunctions of kinetic linear plasma wave modes. Using this technique\, we reinterpret existing observations to cons train aspects of the turbulent cascade and dissipation in the solar wind an d produce predictions which will help interpret future observations of turb ulence in the solar corona.\n\n\n\nJoin with Google Hangouts: https://hango uts.google.com/hangouts/_/physics.umd.edu/plasma-physics?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.niiddvv1uk5q87vu leue6qkl6c&hs=121 LAST-MODIFIED:20141016T153811Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150514T173000Z DTEND:20150514T180000Z DTSTAMP:20260828T094430Z UID:9069ua4bsm0j9er4las1oind8c@google.com CREATED:20150126T224906Z LAST-MODIFIED:20150126T224906Z LOCATION:Room 1305F\; the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151106T170000Z DTEND:20151106T180000Z DTSTAMP:20260828T094430Z UID:bdcf2qjvqe68hmlchehd23jgvk@google.com CLASS:PUBLIC CREATED:20151102T131012Z DESCRIPTION:Speaker Name: Andrew Glaudell\n \nSpeaker Institution: JQI\, Qu ICS\n \n(Free lunch served at 11:45)\n\nTitle: Building High Bandwidth Quan tum Repeaters using Quantum Error Correction\n\nAbstract: Quantum networks\ , with applications ranging from quantum key distribution to distributed qu antum computing\, ultimately require the sharing of entangled bell pairs be tween distant parties. The rate at which these pairs need to be generated d epends on the application\, but can approach and even exceed rates of one g iga-entangled bit per second. To reach such rates at large separation dista nces\, devices called quantum repeaters must be used to overcome photonic q ubit errors and loss. In this talk\, I will briefly discuss the different g enerations of proposed quantum repeaters and the application of quantum err or correction within these devices. I will then analyze the performance tha t can be expected for these devices given both current quantum logic gate s peed and fidelities and using optimal configurations\, as well as what can be expected when the error rates of these devices improve. LAST-MODIFIED:20151102T131013Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121016T180000Z DTEND:20121016T193000Z DTSTAMP:20260828T094430Z UID:avv9h1761mjjek4cq3up9hra4o@google.com CREATED:20121010T173935Z DESCRIPTION:Title: "Probing Electroweak Symmetry Breaking at the Large Hadr on Collider"\nSpeaker: Scott Thomas\nInstitution: Rutgers University\nAbstr act: Discovery of the Higgs boson at the LHC opens up a new era in high ene rgy physics. Some details of the discovery level Higgs searches in the WW and di-photon channels will be reviewed. Possibilities for observing the H iggs boson\, as well as extended Higgs sectors\, in multi-lepton final stat es will be considered. Ideas for probing for violations of symmetries in H iggs boson decays will be developed\, including flavor and time reversal vi olation. Ongoing efforts to use the Higgs boson to search for new physics will be presented.\nExperimental tests of the Higgs mechanism itself will a lso be introduced. Highlights from the search for new physics at the LHC\, including supersymmetry\, will also be presented.\n\n*preceded by lunch at 12:30 pm in 1305F (Toll room) in Physics Bldg LAST-MODIFIED:20121010T174012Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar Joint with Johns Hopkins TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20151119T203000Z DTEND:20151119T220000Z DTSTAMP:20260828T094430Z UID:9a9kr9k7sres57kvarkni6udcc@google.com CREATED:20151105T153304Z DESCRIPTION:Speaker: Amin Gholampour (UMd)\n LAST-MODIFIED:20151105T153305Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Givental's approach to mirror symmetry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150323T203000Z DTEND:20150323T213000Z DTSTAMP:20260828T094430Z UID:jggvktsmp93p6huc36jl991cmc@google.com CREATED:20150226T191503Z DESCRIPTION:Speaker Name: Dennis Bodewits\n\nSpeaker Institution: Dept. of Astromonmy\, University of Maryland\n\nTitle : Catching a Comet: First resu lts from the Rosetta mission\n\nAbstract: Comets are some of the least-alt ered leftovers that survive from the origin of the solar system. On August 6\, 2014\, the Rosetta spacecraft entered a close orbit around comet 67P/Ch uryumov-Gerasimenko\, and three months later it delivered the Philae probe to its surface. I will summarize the mission’s context and some of the exci ting first science results from Rosetta.\n\nNotes: Coffee\, Tea & Cookies 4 :15-4:30 PM\n LAST-MODIFIED:20150319T154151Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121126T213000Z DTEND:20121126T223000Z DTSTAMP:20260828T094430Z UID:54ac25jk9f5rbtjhj79e6itbeo@google.com CREATED:20121120T182110Z DESCRIPTION:Title : Signatures of Heliopause Crossings\n\nSpeaker Name: Mar c Swisdak\n\nSpeaker Institution : IREAP\, University of Maryland LAST-MODIFIED:20121120T182125Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140203T160000Z DTEND:20140203T173000Z DTSTAMP:20260828T094430Z UID:g3prs560upm92dvq0e6tvjigu4@google.com CLASS:PUBLIC CREATED:20131216T190546Z DESCRIPTION:Speaker: Martin Zwierlein\, MIT\n\nTitle: Solitonic Waves in a Fermionic Superfluid\n\nAbstract: Solitons - solitary waves that maintain their shape as they propagate — occur as water waves in narrow canals\, as light pulses in optical fibres and as quantum mechanical matter waves in su perfluids and superconductors. Their highly nonlinear and localized nature makes them very sensitive probes of the medium in which they propagate. We create long-lived solitary waves in a strongly interacting superfluid of fe rmionic atoms and directly observe their motion [1]. As the interactions ar e tuned from the regime of Bose–Einstein condensation of tightly bound mole cules towards the Bardeen–Cooper–Schrieffer limit of long-range Cooper pair s\, the waves' effective mass increases dramatically\, to more than 200 tim es their bare mass. This mass enhancement is more than 50 times larger than the theoretically predicted value for planar solitons. I will present new experiments that reveal the microscopic nature of the observed solitary wav es. Our work provides a benchmark for theories of non-equilibrium dynamics of strongly interacting fermions. [1] Tarik Yefsah\, Ariel T. Sommer\, Mark J.H. Ku\, Lawrence W. Cheuk\, Wenjie Ji\, Waseem S. Bakr\, Martin W. Zwier lein\, Heavy Solitons in a Fermionic Superfluid\, Nature 499\, 426-430 (201 3) LAST-MODIFIED:20140129T160213Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160323T150000Z DTEND:20160323T163000Z DTSTAMP:20260828T094430Z UID:npabg7no6c1etmfc38g1nov00s@google.com CREATED:20160315T164512Z DESCRIPTION:\nSpeaker: Richard Lebed\n\nSpeaker Institution: Arizona State University\n\nTitle: Excursions to Exotic Destinations\n\nAbstract: Followi ng on from the generalities in my colloquium about the discovery and nature of the newly discovered exotic hadrons\, this seminar summarizes my own re search in this very active area. I discuss whether tetraquarks in large Nc QCD arise naturally or not\; then I look at the dynamical diquark picture in a bit more detail to summarize its successes and shortcomings\; what the "cusp effect" is\, and how it can synchronize resonance masses with openin g hadron thresholds\; how to use the "quark-counting rules" of high-energy QCD to discern exotic structure\; whether hidden-strangeness exotics have b een seen and where to look for them\; and lastly\, brand-new work on whethe r hidden-charm\, hidden-strangeness tetraquarks have already been seen. LAST-MODIFIED:20160315T164524Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140205T193000Z DTEND:20140205T203000Z DTSTAMP:20260828T094430Z UID:js0rvr55c2rdotp94gi5pg8434@google.com CLASS:PUBLIC CREATED:20140205T131431Z DESCRIPTION:Speaker: A. Maldonado-Trapp\, Universidad de Concepción\, Chile \n\nTitle: The origin of quantum discord\n\nAbstract: In 2001 Ollivier and Zurek\, and Henderson and Vedral independently conclude that entanglement d oes not take into account all nonclassical correlations. To define a new qu antity\, for bipartite systems\, which not only contains entanglement\, but also other truly quantum correlations\, they introduce quantum discord. Qu antum discord is defined as the difference between two expressions for quan tum mutual information. One of them consists of a measurement process in on e of the subsystems\, which makes the difference of quantum systems. We wil l make a brief review of classical information to understand how the discor d is defined mathematically and then we will see some of their basic proper ties.\n LAST-MODIFIED:20140205T143923Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141203T180000Z DTEND:20141203T193000Z DTSTAMP:20260828T094430Z UID:0n7g2da8ekl1dodbfs3mkl36as@google.com CREATED:20141015T132303Z DESCRIPTION:Title: Magnetized relativistic plasma as a Weyl metal\n\nSpeake r: Igor Shovkovy\, ASU\n\nAbstract: Unusual chiral properties of the ground state of dense relativistic matter in a strong magnetic field will be disc ussed. The main emphasis will be placed on the dynamical generation of the chiral shift in relativistic matter. From the physics viewpoint\, the chira l shift determines a relative shift of the longitudinal momenta (along the direction of the magnetic field) in the dispersion relations of opposite ch irality fermions. In solid state physics\, it was proposed that Weyl metals with such hypothetical property could exist when the time-reversal symmetr y is broken\, but not necessarily by a constant external magnetic field. I will argue that the magnetic field causes ordinary relativistic matter to b ecome a Weyl metal. (This should also work for recently discovered Dirac me tals.) The corresponding ground state is characterized by a chiral asymmetr y at the Fermi surface that affects low-energy physics. Chiral asymmetry co uld be relevant for compact stars and\, perhaps\, also other systems.\n\nJo in with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd .edu/nuclear-physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2Fs ZW5kYXIuZ29vZ2xlLmNvbQ.0n7g2da8ekl1dodbfs3mkl36as&hs=121 LAST-MODIFIED:20141121T183404Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140227T200000Z DTEND:20140227T210000Z DTSTAMP:20260828T094430Z UID:dj3n65v122usv8v09ihkljp5f8@google.com CREATED:20140227T185501Z DESCRIPTION:Speaker: Matthew Calkins (UMCP)\n\nTitle: Spinors\n\nFor more information on RIT\, please visit http://www-math.umd.edu/research/seminars /rit-on-geometry-and-phsyics.html LAST-MODIFIED:20140228T035638Z LOCATION:Physics 4208 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140730T150000Z DTEND:20140730T160000Z DTSTAMP:20260828T094430Z UID:lo5ebrucalkrdbf6p9qs5a87so@google.com CREATED:20140725T201901Z DESCRIPTION:Wednesday July 30\, 2014 at 11:00 AM\nDomain Wall Motion in Mul tilayer Films\n\nChristopher H. Marrows\nSchool of Physics & Astronomy\nUni versity of Leeds\n\n \nDomain walls (DWs) in magnetic nanowires have been p roposed as the basis of memory\, logic\, and sensor technologies. Until rec ently the fruit-fly structure for the study of current-driven DW motion was the in-plane magnetised Permalloy nanowire. In this structure\, DWs are mo ve by the conventional spin-transfer torque\, but critical current densitie s for the onset of motion are typically ~1012 A/m2\, too high for applicati on [1]. Here we show that it is possible to form narrow Néel-type DWs in sy nthetic antiferromagnets (SAFs) formed by sandwiching two CoFe magnetic nan owires on either side of a thin Ru layer\, which provides strong antiferrom agnetic coupling that markedly changes the micormagnetics that determines t he wall structure. Current-driven DW motion has been measured in these syst ems using magnetotransport measurements\, and a critical current density fo r the onset of DW motion ~1×1011 A/m2. An extended 1D model suggests that t he antiferromagnetic coupling can markedly reduce extrinsic pinning of the DW [2]. Meanwhile\, recent experiments in materials with out-of plane aniso tropy suggest that the fast DW velocities are caused by the presence of Née l walls rather than Bloch walls [3]\, generated by the presence of an inter facial Dzyaloshinskii-Moriya interaction (DMI). Here we show that we are ab le to measure the DMI even in the creep regime using a field-driven Kerr-im aging method [4]. We show that by inserting an atomically thin layer of Ir (which has opposite DMI [5]) at a Co/Pt interface we are able to switch the DM field from -60 mT in the case of Pt/Co/Pt to about +60 mT for tIr ~ 0.5 nm. We also comment on the origin of the DMI in the Pt/Co/Pt stack\, showi ng that this nominally symmetric system can show strong effects due to chan ges in growth quality breaking the symmetry of Pt/Co and Co/Pt interfaces [ 6].\n\n \n\n[1] C. H. Marrows\, Advances in Physics 54\, 585 (2005). [2] H. Saarikoski et al.\, arXiv:1407.5805 [cond-mat.mes-hall]. [3] S. Emori et a l.\, Nature Mater. 12\, 611 (2013)\; K.-S. Ryu et al.\, Nature Nano. 8\, 52 7 (2013). [4] S.-G. Je et al.\, Phys. Rev. B 88\, 214401 (2013). [5] G. Che n et al.\, Nature Comm. 4\, 2671 (2013). [6] A. Hrabec et al.\, Phys. Rev. B 90\, 020402(R) (2014).\n\nBiography:\nChristopher Marrows is Professor of Condensed Matter Physics\, and was previously a Reader in the same subject \, a lecturer\, and before that an 1851 research fellow\, funded by the Roy al Commission for the Exhibition of 1851. He has published almost 190 artic les in peer-reviewed journals since the completion of his thesis in 1997\, and is regularly a speaker at conferences around the world. He has publishe d with over 200 other scientists from 70 institutions in 16 countries. Rec ent pieces of work have been selected as a scientific highlights by ISIS\, the Diamond Light Source\, and the National Synchrotron Light Source at Bro okhaven National Laboratory on Long Island in New York State.\nAttachments area\nPreview attachment Marrows Advert.pdf\n[PDF]\n\n\nJoin with Google Ha ngouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/christopher- h?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmN vbQ.lo5ebrucalkrdbf6p9qs5a87so&hs=121 LAST-MODIFIED:20140725T201925Z LOCATION:Room 2136 in the New Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Christopher H. Marrows - Special Seminar in CM Physics and Material s Science TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20150921T110000 DTEND;TZID=America/New_York:20150921T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20150921T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Xiaoliang Qi\, Stanford\n\nTitle: Long-range mutual information and topological uncertainty principle\n\nAbstract: Ordered phases in Landa u paradigm can be diagnosed by a local order parameter\, whereas topologica lly ordered phases cannot be detected in such a way. In this work\, we prop ose long-range mutual information(LRMI) as a unified diagnostic for both co nventional long-range order and topological order. Physically\, LRMI descri bes condensation of extended objects such as strings and membranes. As a ke y feature of topological order to be distinguished from conventional order\ , we propose and study the topological uncertainty principle\, which descri bes the non-commuting nature of non-local order parameters in topological o rders. The topological uncertainty principle guarantees that nontrivial ent anglement always exists in ground states of topologically ordered states\, and proposes a new framework for understanding higher dimensional topologic ally ordered states. LAST-MODIFIED:20150915T132340Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151014T140000Z DTEND:20151014T170000Z DTSTAMP:20260828T094430Z UID:18d79f1tlelnebqqp5da5jfdtc@google.com CREATED:20150921T194243Z DESCRIPTION:Theme: MBL\, Interactions\, and Correlations\n\n10:00 AM Dong -Ling Deng "Exponential Orthogonality Catastrophe in Single-particle and M any-body Localized Systems"\n\n10:45 AM Xiaopeng Li "Many-body Localizati on\, Mobility Edge and a Non-Ergodic Metal Phase in a One Dimensional Incom mensurate Lattice"\n\n11:30 AM Bitan Roy "Phases and phase transitions in three dimensional parabolic semimetals: Application to 227 pyrochlore irid ates"\n\n12:15 PM Juraj Radic "Strong correlation effects in a two-dimens ional Bose gas with quartic dispersion"\n LAST-MODIFIED:20150921T194243Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151112T210000Z DTEND:20151112T220000Z DTSTAMP:20260828T094430Z UID:l5bjjguu498iqktdt45on3hb68@google.com CREATED:20151022T133137Z DESCRIPTION:Speaker Name: Dr. Naoko Neilson\n\nSpeaker Institution : Drexel University\n\nTitle: Detecting Cosmic Neutrinos with IceCube at the Earth' s South Pole \n\nAbstract: The universe has been studied using light since the dawn of astronomy\, when starlight captured the human eye. The IceCube Neutrino Observatory views the universe in a different and unique way: in high-energy neutrinos. IceCube's recent discovery of a diffuse flux of astr ophysical neutrinos\, in other words\, the universe glowing in neutrinos fr om beyond the solar system\, started a new era of neutrino astronomy. I wil l motivate why neutrinos are a necessary messenger in high-energy astronomy . I will discuss the multiple diffuse flux analyses in IceCube that observ e the astrophysical flux\, and what each can tell us. Spatial analyses that aim to identify the sources of such astrophysical neutrinos will also be d iscussed\, followed by an attempt to reconcile all results\, to draw a cohe rent picture that is the state of neutrino astronomy LAST-MODIFIED:20151022T133447Z LOCATION:PSC Room 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP/PA Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160201T213000Z DTEND:20160201T223000Z DTSTAMP:20260828T094430Z UID:b6jp6th26d6ei119kd1rkjikeo@google.com CREATED:20160201T161751Z DESCRIPTION:Speaker Name: Vladimir Ptuskin\n\nSpeaker Institution : IZMIRAN \, Russia\n\nTitle: Where Are Cosmic Ray Pevatrons?\n\nAbstract : The orig in of Galactic cosmic rays is associated with the most energetic astronomic al objects in the Galaxy\, primarily with the supernova remnants. It is usu ally assumed that the particle energy about few PeV/Z (1 PeV = 10^15 eV\; Z is the particle charge) is the upper limit for acceleration in the majorit y of supernova remnants. It explains the corresponding break (the knee) in a power law energy spectrum and the changes of elemental composition of cos mic rays above the knee. We discuss how modern theory of particle accelerat ion by supernova shock waves with the subsequent diffusion in the interstel lar magnetic fields is compatible with this scenario and how gamma ray astr onomy may demonstrate the existence of Pevatrons in the Galaxy.\n LAST-MODIFIED:20160201T161859Z LOCATION:2400 CSS SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121002T200000Z DTEND:20121002T210000Z DTSTAMP:20260828T094430Z UID:58da2l4g6na4f8d84i4d7j4ejo@google.com CREATED:20120926T200229Z DESCRIPTION:Speaker: Sir Michael Berry\, Melville Wills Professor of Physic s\, University of Bristol\nTitle: “Hamilton’s diabolical singularity”\nAbs tract:\nHamilton’s first application of the concept of phase-space – later so fruitful in the transition to quantum physics - was a prediction in opti cs: conical refraction in biaxial crystals. This created a sensation at the time (1831)\, probably because it was one of the first successful uses of mathematics to predict a qualitatively new phenomenon. At the heart of coni cal refraction is a singularity\, anticipating the simplest geometric phase and the conical intersections extensively studied in quantum chemistry and now resurrected in graphene. The light emerging from the crystal contains many subtle diffraction details\, whose definitive understanding and observ ation have been achieved only recently. Generalizations of the phenomenon i nvolve radically different mathematical structures\, reflecting the differe nt physics of real symmetric\, complex hermitian\, and nonhermitian two by two matrices\, that are still being explored theoretically and experimental ly. LAST-MODIFIED:20120926T200246Z LOCATION:Physics Lecture Hall – rooms 1410 & 1412. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Pai Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160413T150000Z DTEND:20160413T163000Z DTSTAMP:20260828T094430Z UID:uhcr8fr4ctq66l3qcdqnfinrg4@google.com CREATED:20160406T141355Z DESCRIPTION:**Please no food or drink inside PSC 1136**\n\nSpeaker: Cheuk-Y in Wong\n\nSpeaker Institution: Oak Ridge National Laboratory\n\nTitle: The Hadron p_T Distribution in High-Energy pp Collisions and its Implications \n\nAbstract: Transverse momentum distribution of jets and hadrons provide useful information on the collision mechanisms and their subsequent dynamic s in pp collisions at very high energies. It was found recently that the h adron transverse spectra spanning over 14 decades of magnitude from the low est of 0.5 GeV/c to the highest p_T of a few hundred GeV/c at central rapid ity in pp collisions at LHC can be adequately described by a single Tsallis distribution with only three apparent degrees of freedom [1-3]. The simpl icity of the p_T spectrum and the two-hadron angular correlation data sugge st that a single mechanism of hard scattering dominates over a large pT dom ain at central rapidity in high-energy collisions at LHC energies\, in cont rast to the flux tube fragmentation that dominates the low pT region at low er collision energies. We shall examine the signatures and space-time dyna mics of hard scattering and flux tube fragmentation [4\,5] and the interpla y between these two processes as a function of pT and collision energies.\n \n[1] C.Y.Wong \, G.Wilk\, {Tsallis fits to pT spectra for pp collisions at LHC}\, Acta. Phys. Pol B43\,247(2012).\n[2] C.Y.Wong\, G.Wilk\, {Tsallis f its to pT spectra and multiple hard scattering in pp Collisions at the LHC} \, Phys.Rev.D87\,114007(2013).\n[3] C.Y.Wong\, G.Wilk\, L.Cirto\, C.Tsallis \, {From QCD-based hard-scattering to nonextensive statistical mechanical d escriptions of transverse momentum spectra in high-energy pp and p-pbar col lisions}\,Phys.Rev.D91\,114027(2015).\n[4] C.Y.Wong\, {Signature of the fra gmentation of a color flux tube}\, Phys. Rev. D 92\, 074007 (2015).\n[5] C. Y.Wong\, {Event-by-event study of space-time dynamics in flux-tube fragment ation}\, arxiv:1510.07194v2 (2015). LAST-MODIFIED:20160406T171351Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140310T173000Z DTEND:20140310T183000Z DTSTAMP:20260828T094430Z UID:sej5552bghdqed19i5hij6g85c@google.com CREATED:20140116T172752Z DESCRIPTION:Title: Neutron in a strong magnetic field and effects from fini te volume\n\nSpeaker: Brian Tiburzi\, CCNY\n\nAbstract: Computation of magn etic properties of the neutron using lattice QCD in uniform magnetic fields is subject to various systematic effects. I will give an overview of a qua ntitative attempt to understand these systematics focusing on non-perturbat ive magnetic field strengths in both infinite and finite volume. While ther e is rich physics at finite volume (gauge holonomies and the Aharonov-Bohm effect)\, simple results are nonetheless obtained. LAST-MODIFIED:20140304T153626Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140923T200000Z DTEND:20140923T210000Z DTSTAMP:20260828T094430Z UID:q9sqnmd6bo54ciujd3ltgu3sfg@google.com CREATED:20140718T144322Z DESCRIPTION:Speaker Name: Brian DeMarco\n\nSpeaker Institution: Universit y of Illinois at Urbana\n\nTitle: Ultracold Disordered Quantum Gases\n\nAb stract: Disorder is the rule\, rather than the exception\, in nature. Des pite this\, we understand little about how disorder affects interacting qua ntum matter. I will give an overview of our experiments using ultracold at om gases to probe paradigms of interacting disordered quantum particles. W e introduce disorder to naturally clean atomic gases cooled to billionths o f a degree above absolute zero using focused optical speckle. I will expla in how we observe Anderson localization---a spectacular phenomenon in which interference prevents waves from propagating in a disordered medium---of q uantum matter in three dimensions. I will also show how we combine speckle with an optical crystal to emulate a completely tunable and precisely char acterized disordered quantum solid. In these optical lattice experiments\, we realize disordered Hubbard models that we use to answer critical questi ons regarding how disorder impacts the properties of electronic solids\, su ch as superconductors and metals.\n\n\n\n\nJoin with Google Hangouts: https ://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1Y jhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.q9sqnmd6bo54ciujd 3ltgu3sfg&hs=121 LAST-MODIFIED:20140804T201759Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140324T150000Z DTEND:20140324T163000Z DTSTAMP:20260828T094430Z UID:3gpe6paahlhadh30hlg4b2jm70@google.com CLASS:PUBLIC CREATED:20131216T192842Z DESCRIPTION:Speaker: John Bollinger\n\nSpeaker Institution: NIST Boulder\n\ nTitle: Quantum control and simulation with 2-dimensional arrays of trapped ions \n\nAbstract: Trapped ions\, when cooled to sufficiently low temperat ures form crystalline arrays. I will describe our efforts to extend the qua ntum control techniques developed with linear chains of ions in rf traps to two-dimensional triangular arrays of hundreds of ions formed in a Penning trap. Penning traps use a uniform magnetic field and static electric field s to confine charged particles. Our qubit is the 124 GHz electron spin-fli p transition in the ground state of Be+ in the 4.5 T magnetic field of the Penning trap. We control the spins with an effective transverse magnetic fi eld generated with 124 GHz microwaves. Spin-dependent optical dipole force s are used to engineer long range Ising interactions between the ion qubits \, and to characterize the motional degrees of freedom of the trapped ions. This system has the potential for simulating quantum non-equilibrium phen omena with an intractable number of spins.\n\nHost: Luis Orozco LAST-MODIFIED:20140311T175159Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150810T150000Z DTEND:20150810T160000Z DTSTAMP:20260828T094430Z UID:rf3fs5mp4r7lmnlem67rmon0dk@google.com CLASS:PUBLIC CREATED:20150717T192405Z DESCRIPTION:\nPrzemek Bienias\, University of Stuttgart\, Germany\n\nTitle: Quantum optics with strongly interacting Rydberg polaritons\n\nAbstract: R ecently\, the combination of slow light polaritons with the strong interact ions between Rydberg atoms has emerged as a promising system for inducing a strong interaction between photons. Potential applications range from the implementation of phase gate for photons\, to single photon sources\, as we ll as the generation of strongly correlated states of photons. From theoret ical point of view\, the many-body setup of propagating Rydberg polaritons is hard to describe\, especially when polaritons are strongly interacting [ 1]. W show that in the regime of intermediate interaction strengths the man y-body problem has an exact analytical solution for an arbitrary atomic den sity. Using developed theoretical framework [2]\, we discuss the solution a nd its regimes of validity. For weak nonlinearities\, we establish the rela tion between the polariton setup and classical behaviour of a Kerr nonlinea rity. Furthermore\, we provide quantum correction to the classical Kerr non linearity. This theoretical platform is applicable to ongoing experiments a nd can be used as a benchmark for other theoretical methods.\n\n[1] O. Fir stenberg\, T. Peyronel\, Q.-Y. Liang\, A. V. Gorshkov\, M. D. Lukin and V. Vuletic\, Attractive photons in a quantum nonlinear medium.\, Nature\, 502\ , 71–75 (2013).\n\n[2] P. Bienias\, S. Choi\, O. Firstenberg\, M. F. Maghr ebi\, M. Gullans\, M. D. Lukin\, A. V. Gorshkov and H. P. Büchler\, Scatter ing resonances and bound states for strongly interacting Rydberg polaritons \, Phys. Rev. A\, 90\, 053804 (2014). LAST-MODIFIED:20150717T192405Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140324T200000Z DTEND:20140324T210000Z DTSTAMP:20260828T094430Z UID:6p1pagjrjn3p4nu4l27q64p8i0@google.com CREATED:20140304T193539Z DESCRIPTION:Speaker Name: Karissa Sanbonmatsu\n\nSpeaker Institution : Los Alamos National Laboratory\n\nTitle: Rise of the RNA machines: ribosomes an d long non-coding RNAs\n LAST-MODIFIED:20140321T174905Z LOCATION:0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141112T210000Z DTEND:20141112T220000Z DTSTAMP:20260828T094430Z UID:vrgmefo291pgu8q0nliril2i5c@google.com CREATED:20141106T185157Z DESCRIPTION:Speaker Name: Joel Dahlin\n\nSpeaker Institution : University o f Maryland\n\nTitle: The mechanisms of electron heating and acceleration d uring magnetic reconnection\n\n\n\nJoin with Google Hangouts: https://hango uts.google.com/hangouts/_/physics.umd.edu/plasma-physics?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.vrgmefo291pgu8q0 nliril2i5c&hs=121 LAST-MODIFIED:20141106T185157Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150420T200000Z DTEND:20150420T210000Z DTSTAMP:20260828T094430Z UID:vkr5v61c45nebvkqlsbi4rtn28@google.com CREATED:20150410T152338Z DESCRIPTION:Refreshments @ 3:30 pm\n\nSpeaker: Dr. Julio Navarro\n\nSpeaker Institution: University of Victoria\n\nTitle: Dwarf Galaxy Challenges to t he Cosmological Paradigm\n\nAbstract: A number of observations of dwarf gal axies pose challenges to our understanding of the clustering of matter on s mall scales in the current ΛCDM paradigm. These include the scarcity of dwa rf galaxies compared with the numerous low-mass halos expected in the curre nt ΛCDM paradigm (the “missing satellites” problem)\; the inner mass profil es of cold dark matter halos compared with the rotation curves of dwarf gal axies (the “cusp vs core” problem)\; the highly anisotropic distribution of satellite galaxies around the Milky Way and Andromeda galaxies (the “satel lite alignment” problem)\; and the low halo masses inferred for the faintes t dwarfs (the “too-big-to-fail” problem). I will discuss these challenges\, as well as the puzzles and challenges that arise from them and from their possible resolution.\n\nhttps://jsi.astro.umd.edu/jsi-colloquium-series LAST-MODIFIED:20150410T152338Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium – Julio Navarro (U. of Victoria) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150422T170000Z DTEND:20150422T183000Z DTSTAMP:20260828T094430Z UID:nkosqva9npcnuemvuc6c1idgr8@google.com CREATED:20150410T200841Z DESCRIPTION:Speaker: Ivan Horvath\n\nSpeaker Institution: University of Ken tucky\n\nTitle: Phases of SU(3) Gauge Theories with Fundamental Quarks via Dirac Spectral Density\n\nAbstract: Distinguishing qualitatively different vacua (or thermal states) of gauge theories has been an interesting topic s ince such systems were introduced into particle physics. The issue continue s to be particularly relevant with quarks in fundamental representation of the gauge group where the screening of strong force by pair production make s Wilson loop considerations ambiguous. In this talk I discuss the proposal to clasify the vacua of these theories via the response of a massless prob ing (external) quark\, and describe the simplest gauge invariant approach o f this type that uses the spectral density of Dirac modes. The new phase ch aracterized by bimodal (anomalous) behavior of spectral density is found\, arising due to both thermal and light-quark many-flavor effects. I will arg ue that this phase is expected to occur quite generically in these systems\ , and is in fact a reality of "real world" strong interactions at RHIC-type temperatures. Dynamics of anomalous phase is that of a deconfined system w ith broken chiral symmetry. LAST-MODIFIED:20150417T132231Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151204T170000Z DTEND:20151204T180000Z DTSTAMP:20260828T094430Z UID:6d1rs37pis16er9nrmsi51hh3k@google.com CLASS:PUBLIC CREATED:20151130T132009Z DESCRIPTION:Speaker Name: Ranchu Mathew\n\nSpeaker Institution: JQI\n\nTitl e: A spinor atom-SQUID\n\nAbstract: Over the past few years\, there has bee n a concerted effort at NIST\nstudying the atomic analogue of a Superconduc ting Quantum Interference\nDevice (SQUID). The atom-SQUID consists of a Bos e-Einstein condensate\nin a ring trap with a rotating external weak link. The system displays\nthe phenomena of persistent current and hysteresis. I n this talk\, I will\npresent our results on the the effect of the spin deg ree of freedom on\nthe stability of persistent-current states and hysteresi s in a spin-1\natom-SQUID. Inter-atomic interactions induces coherent oscil lations\nbetween the spin levels while conserving total magnetisation.\nWe study the stability by calculating the Bogoliubov spectrum\nof the mean-fie ld solutions of a two-mode approximation and the\nsolutions of Gross-Pitaev skii equation.\n\n(Free lunch served at 11:45) LAST-MODIFIED:20151202T191134Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130401T154500Z DTEND:20130401T163000Z DTSTAMP:20260828T094430Z UID:hv4frfh9at07pcm75ikigqp6dc@google.com CREATED:20130314T152712Z LAST-MODIFIED:20130314T152719Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon for seminar attendees TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131017T173000Z DTEND:20131017T180000Z DTSTAMP:20260828T094430Z UID:2fq2f51vdfl7r6ndeh6h2sbgqo@google.com CREATED:20130918T131030Z LAST-MODIFIED:20130918T131040Z LOCATION:the "new" Toll Room\, Phys Room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150408T193000Z DTEND:20150408T203000Z DTSTAMP:20260828T094430Z UID:0eo397dt6gdpsncist7m6usbpg@google.com CREATED:20150403T150110Z DESCRIPTION:Speaker Name: Dr. Pratibha Dev\n\nSpeaker Institution : Naval R esearch Lab\n\nAbstract : In the first part of this talk\, I will discuss t he mechanism behind unconventional magnetism (called sp/d0 magnetism) shown by various semiconductors and insulators that are not doped with magnetic elements. The common features in most of the experiments reporting d0-magne tism are the presence of: (1) defects\, and (2) second-row elements (carbon \, nitrogen and oxygen) with fairly localized 2p electrons. Detailed ab-ini tio calculations show that acceptor-like defects play an important role in inducing and mediating magnetism in bulk and nano-structured nitrides and o xides. The quantitative DFT results are further mapped onto the Heisenberg model providing a simple physical picture. In the second part of the talk\, I will discuss defect (non-magnetic adsorbate)-induced magnetism in graphe ne and show the importance of including the effects of the substrates in de termining the properties of functionalized graphene. The sensitivity of the functionalized graphene to its local environment raises interesting possib ilities for controlling properties through an appropriate choice of substra te and the number of graphene layers.\n\nNotes: LPS is located at 8050 Gree nmead Drive in College Park. There is parking at LPS and overflow parking a t the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the phone on t he left hand side of the front door to call the receptionist for entry.\n\n LAST-MODIFIED:20150403T150854Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141028T150000Z DTEND:20141028T163000Z DTSTAMP:20260828T094430Z UID:bt10ii8udkm2usok3dp5tcmcgk@google.com CREATED:20140911T142657Z DESCRIPTION:Speaker Name: Kun Yang\n\nSpeaker Institution: NHMFL & Florid a State University\n\nTitle: Entanglement Scaling Laws and Eigenstate Ther malization in Many-Particle Systems\n\nAbstract: Entanglement is perhaps th e most counter-intuitive aspect of quantum mechanics\, and provides the sha rpest distinction between quantum and classical descriptions of nature. The most widely used measure of entanglement is the entanglement entropy. For extended quantum systems\, ground states of local Hamiltonians are expected to follow the so called “area law”\, which states that the entanglement en tropy is proportional to the surface area of the subsystem. However\, viola tions of the area law do exist\, and it is important to understand their or igin. In 1D they are found to be associated with quantum criticality. Until recently the only established examples of such violation in higher dimensi ons are free fermion ground states with Fermi surfaces\, where it is found that the area law is enhanced by a logarithmic factor. In Ref. [1]\, we us e multi-dimensional bosonization to provide a simple derivation of this res ult\, show that the logarithimic factor has a 1D origin. More importantly t he bosonization technique allows us to take into account the Fermi liquid i nteractions\, and obtain the leading scaling behavior of the entanglement e ntropy of Fermi liquids. The central result of our work is that Fermi liqui d interactions do not alter the leading scaling behavior of the entanglemen t entropy\, and the logarithmic enhancement of area law is a robust propert y of the Fermi liquid phase.\n\nIn sharp contrast to the fermioic systems w ith Fermi surfaces\, quantum critical (or gapless) bosonic systems do not v iolate the area law above 1D (except for the case discussed below). The fun damental difference lies in the fact that gapless excitations live near a s ingle point (usually origin of momentum space) in such bosonic systems\, wh ile they live around an (extended) Fermi surface in Fermi liquids. In Ref. [2]\, we studied entanglement properties of some specific examples of the s o called Bose metal states\, in which bosons neither condense (and become a superfluid) nor localize (and insulate) at T=0. The system supports gaples s excitations around ``Bose surfaces"\, instead of isolated points in momen tum space. We showed that similar to free Fermi gas and Fermi liquids\, the se states violate the entanglement area law in a logarithmic fashion. Our r esults demonstrate that perhaps area-law violation in high dimensions is mo re common than previously thought\; in particular the existence of Fermi su rface(s) is not a prerequisite for it.\n\nCompared to ground states\, much less is known concretely about entanglement in (highly) excited states. Goi ng back to free fermion systems\, in [3] we show that there exists a dualit y relation between ground and excited states\, and the area law obeyed by g round state turns into a volume law for excited states\, something that is widely expected but very hard to prove. Most importantly\, we find in appro priate limits the reduced density matrix of a subsystem takes the form of t hermal density matrix\, providing an explicit example of the eigenstate the rmalization hypothesis. Our work [3] explicitly demonstrates how statistica l physics emerges from entanglement in a single eigenstate.\n\n[1] Entangle ment Entropy of Fermi Liquids via Multi-dimensional Bosonization\, Wenxin D ing\, Alexander Seidel\, Kun Yang\, Phys. Rev. X 2\, 011012 (2012).\n\n[2] Violation of Entanglement-Area Law in Bosonic Systems with Bose Surfaces: P ossible Application to Bose Metals\, Hsin-Hua Lai\, Kun Yang\, N. E. Bonest eel\, Phys. Rev. Lett. 111\, 210402 (2013).\n\n[3] Entanglement entropy sca ling laws and eigenstate thermalization in free fermion systems\, Hsin-Hua Lai\, Kun Yang\, arXiv:1409.1224.\n\nHost: Bitan Roy\n\nhttp://www.physics .umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20141020T204731Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150402T163000Z DTEND:20150402T173000Z DTSTAMP:20260828T094430Z UID:ojkc7jaq8jiiac5euvar71bv7c@google.com CREATED:20150327T160920Z DESCRIPTION:Speaker Name: James Alexander\n\nSpeaker Institution : Universi ty of Maryland\n\nTitle: Dynamics of Langmuir films: theory and experiment \n\nAbstract : A Langmuir film is a molecularly thin film on a surface. Her e we consider the behavior of such films on a flat water surface. (Note: “w e” consists of a team of mathematicians\, a physicist\, a chemical engineer \, and several students/post-docs.) The equilibrium state of a finite domai n (= “blob”) of such a film is a circular disk. We consider the dynamical b ehavior when such a domain is disturbed. The tension at the boundary of the domain is the restoring force (so-called line tension\, analogous to surfa ce tension of a fluid)\, which competes against the viscosity of the underl ying fluid. A prominent problem is to measure the line tension. The system is modeled as two coupled Navier-Stokes systems\, which\, because the Reyno lds numbers are small\, reduces to two coupled Euler flows. Solutions are f ound which permit comparison with experiment. An advance we make is to mode l the system globally\, not just asymptotically at the end of relaxation to equilibrium. This requires advances in numerical techniques to make the co mputation effective. In this lecture\, we describe the project\, from conce ptual beginning through to the quantitative dovetailing of theory with expe riment. LAST-MODIFIED:20150327T161038Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T203000Z DTEND:20140331T213000Z DTSTAMP:20260828T094430Z UID:bjqpv19pbhbmm8dl2htkvvf63k@google.com CREATED:20140203T160927Z DESCRIPTION:Speaker Name: James Klimchuk\n\nSpeaker Institution : NASA\, GS FC\n\nTitle: Why is the Solar Corona So Hot?\n\nAbstract: This fundamenta l question has challenged space scientists for decades. At temperatures of several million degrees\, the corona is hundreds of times hotter than the solar surface\, so heat cannot simply flow upward against the temperature g radient. (The same is true on other stars.) It is widely believed that th e energy responsible for the extreme temperatures is extracted from the str essed magnetic fields that permeate the corona. The details of how this oc curs are still\, however\, a matter of vigorous debate. Finding the answer is more than just a fascinating intellectual exercise. X-ray and UV radia tion from the corona is an important driver of the Earth's upper atmosphere . In this talk\, I will review our current understanding of the coronal he ating problem and discuss exciting recent advances.\n\nNotes: Tea and Cooki es 4:15-4:30 pm\n LAST-MODIFIED:20140312T171831Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140507T173000Z DTEND:20140507T190000Z DTSTAMP:20260828T094430Z UID:qp9m0aifnpprli2svemrqskn7c@google.com CREATED:20140304T204355Z DESCRIPTION:Title: Building an Event Horizon Telescope: Imaging and Time Re solving Black Holes\n\nSpeaker: Shep Doeleman\, MIT Haystack\n\nAbstract: A convergence of high bandwidth radio instrumentation and Global mm and subm m wavelength facilities are enabling assembly of the Event Horizon Telescop e (EHT): a short-wavelength Very Long Baseline interferometry (VLBI) array with the capability of observing the nearest supermassive black holes with Schwarzschild Radius resolution. Initial observations with the EHT have re vealed event horizon scale structure\nin SgrA*\, the 4 million solar mass b lack hole at the Galactic Center\, and in the much more luminous and massiv e black hole at the center of the giant elliptical galaxy M87.\nOver the ne xt 2-3 years\, this international project will add new sites and increase o bserving bandwidth to focus on astrophysics at the black hole boundary. EH T data products will have an unprecedented combination of sensitivity and resolution with excellent prospects for imaging strong GR signatures\, dete cting magnetic field structures through full polarization observations\, ti me-resolving black hole orbits\, new tests of GR\,\nand modeling black hole accretion\, outflow and jet production. This talk will briefly review the technical roadmap and timeline for building out the EHT\, and describe the latest EHT observations. LAST-MODIFIED:20140505T130421Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150219T173000Z DTEND:20150219T183000Z DTSTAMP:20260828T094430Z UID:5a04o2to2qh1e2qc5p49r157p4@google.com CREATED:20150216T140513Z DESCRIPTION:Speaker Name: John Harlim\n\nSpeaker Institution: Departments o f Mathematics and Meteorology\, Penn State University\n\nTitle: Diffusion F orecast \n\nAbstract: I will discuss a nonparametric modeling approach for forecasting stochastic dynamical systems on low-dimensional manifolds. The key idea is to represent the discrete shift maps on a smooth basis which ca n be obtained by the diffusion maps algorithm. In the limit of large data\, this approach converges to a Galerkin projection of the semigroup solution of the backward Kolmogorov equation of the underlying dynamics on a basis adapted to the invariant measure. This approach allows one to quantify evol ve the probability distribution of non-trivial dynamical systems with equat ion-free modeling.\n LAST-MODIFIED:20150216T185858Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150227T170000Z DTEND:20150227T180000Z DTSTAMP:20260828T094430Z UID:2me4h2lf5snhmffv9osjup83oo@google.com CLASS:PUBLIC CREATED:20150219T182231Z DESCRIPTION:Speaker Name: Stefan Natu\n\nSpeaker Institution: JQI\n\nTitle: Striped Ferronematic Ground states in a spin-orbit coupled spin-1 Bose ga s\n \nAbstract: Motivated by recent experiments on spin-orbit coupled quan tum gases\, and the recent cooling to degeneracy of large spin atoms\, we explore the ground state phase diagram of a spin-orbit coupled spin-1 Bose gas. A key new feature of large spin systems is the appearance of liquid cr ystalline order such as nematic or more exotic platonic solid order\, which has no analog in solid state. Here we explore the interplay between spin o rder\, translational symmetry breaking induced by spin-orbit coupling and t hese liquid crystalline order parameters in the experimentally relevant spi n-1 system\, finding a rich phase diagram. For repulsive spin-dependent int eraction\, we find a transition from a uniaxial ferronematic phase with XY spiral spin order but uniform total density to a biaxial ferronematic phase with stripes in the total density. As a function of the quadratic Zeeman s hift (q)\, for attractive spin dependent interactions\, we find a transitio n from a ferromagnetic stripe phase which breaks translational symmetry in real space to a uniform ferromagnet for q>0 and a uniform nematic phase fo r q<0. We discuss the implications of our predictions to ongoing experiment s on spin-orbit coupled large spin quantum gases. \n\nNotes: Free lunch se rved right before the talk LAST-MODIFIED:20150220T205340Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120507T163000Z DTEND:20120507T173000Z DTSTAMP:20260828T094430Z UID:o38ngaf4hbgushdjbc0cjkqb94@google.com CREATED:20120409T131451Z DESCRIPTION:Title: Ultracold fermions with strong interactions\nAbstract: We have studied ultracold fermions with both attractive and repulsive inter actions. Fermions with attractive interactions undergo a phase transition to superfluidity. For repulsive interactions\, a transition to a ferromagn etic phase has been predicted – the so-called Stoner model for itinerant fe rromagnetism. However\, any strong short-range repulsive potential necessa rily features a weakly bound paired state. Our experiments show that the f erromagnetic transition does not take place\, but is rather preempted by ra pid pair formation. Our experimental study can be regarded as a quantum si mulation of a Hamiltonian\, for which even the qualitative phase diagram ca nnot be reliably obtained by computational methods.\n LAST-MODIFIED:20120502T201334Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Wolgang Ketterle TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140416T170000Z DTEND:20140416T180000Z DTSTAMP:20260828T094430Z UID:vf5oqda9une80ppj1arbgljdcg@google.com CREATED:20140404T152135Z DESCRIPTION:Speaker Name: Norbert Linke\n\nSpeaker Institution: Oxford\n\n Title: High fidelity quantum computing in 43Ca+\n\nAbstract: The big chall enge for quantum computing is performing high-fidelity operations on a scal able number of well-controlled qubits. Trapped ions are a promising candida te system in this context. Implementing a qubit in the hyperfine-split grou nd level of 43Ca+ has particular advantages such as the availability of pai rs of states which are magnetic field insensitive to first order (so-called "clock" states) and hence give long coherence times (up to 1min). I will p resent recent results from experiments with 43Ca+ in the Oxford ion trap gr oup which include a high fidelity two-qubit gate driven with Raman lasers a nd a single-qubit gate performed using near-field microwaves in a surface-e lectrode trap. I will also discuss our current effort towards individual si ngle-qubit addressing with microwaves in a scalable multi-zone surface trap . \n\nHost: Chris Monroe LAST-MODIFIED:20140411T163306Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150914T190000Z DTEND:20150914T203000Z DTSTAMP:20260828T094430Z UID:7o1cu71n6at4gf1cvpou642lqo@google.com CREATED:20150817T151200Z DESCRIPTION:Speaker: Mariangela Lisanti\n\nSpeaker Institution: Princeton\ n\nTitle: Evidence for Unresolved Gamma-Ray Point Sources in the Inner Gala xy\n\nAbstract: We present a new method to characterize unresolved point so urces (PSs)\, generalizing traditional template fits to account for non-Po issonian photon statistics. We apply this method to Fermi Large Area Teles cope gamma-ray data to characterize PS populations at high latitudes and in the Inner Galaxy. We find that PSs (resolved and unresolved) account for ~50% of the total extragalactic gamma-ray background in the energy range ~1 .9 to 11.9 GeV. Within 10 degrees of the Galactic Center with |b| \\geq 2 degrees\, we find that ~5--10% of the flux can be accounted for by a popula tion of unresolved PSs\, distributed consistently with the observed ~GeV ga mma-ray excess in this region. The excess is fully absorbed by such a popul ation\, in preference to dark-matter annihilation. The inferred source popu lation is dominated by near-threshold sources\, which may be detectable in future searches.\n\nJoin with Google Hangouts: https://hangouts.google.com/ hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0am Z1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7o1cu71n6at4gf1cvpou642lqo&hs=121 LAST-MODIFIED:20150831T152449Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160330T190000Z DTEND:20160330T200000Z DTSTAMP:20260828T094430Z UID:qsst0a2uomeio9k8fh3gtcg3bo@google.com CREATED:20160328T131101Z DESCRIPTION:Speaker Name: Professor Sarah Bergbreiter \n\nSpeaker Instituti on : University of Maryland\n\nTitle : Tiny leaps for robot kind: mixing mi crofabrication and robotics\n\nAbstract : Research on mobile microrobots ha s been ongoing for the last 20 years\, but the few robots that have walked have done so at slow speeds on smooth silicon wafers. However\, ants can mo ve at speeds over 40 body lengths/second on surfaces from picnic tables to front lawns. What challenges do we still need to tackle for microrobots to achieve this incredible mobility? This talk will discuss some of the mechan isms and motors we have designed and fabricated to enable robot mobility at the insect size scale as well as the use of microfabrication to improve la rger robots. Mechanisms and sensors utilize new microfabrication processes to incorporate materials with widely varying moduli and functionality for m ore complexity in smaller packages. Actuators are designed to provide signi ficant improvements in force density\, efficiency and robustness over previ ous microactuators. Results include a 4mm jumping mechanism that can be lau nched approximately 35 cm straight up as well as! a 300mg robot that jumps 8 cm with on-board power\, sensing\, actuation and control. LAST-MODIFIED:20160328T131306Z LOCATION:Laboratory for Physical Sciences SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160128T203000Z DTEND:20160128T220000Z DTSTAMP:20260828T094430Z UID:v7f2cj2ut5cm1nup9migtt03ec@google.com CREATED:20160128T151607Z DESCRIPTION:Speaker: Chuck Doran (Alberta and Maryland)\nAbstract: In 2002\ , at the Fano Conference\, Andrey Tyurin made two insightful proposals rega rding Calabi-Yau manifolds and their moduli: (1) a definition of “construct ive” Calabi-Yau manifolds\, i.e.\, those which admit degenerations to a uni on of two quasi-Fano varieties intersecting transversely\, and (2) a questi on of how the mirror Calabi-Yau manifolds should be related to the mirror L andau-Ginzburg models of the component Fano varieties. We will explore thes e proposals\, working our way up in dimension\, and survey our results to d ate\, with a special emphasis on the quintic/quintic mirror Calabi-Yau thre efolds. This is a recap of my talk at the String-Math Conference earlier t his month.\n LAST-MODIFIED:20160128T151608Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mirror Symmetry\, Tyurin Degenerations\, and Calabi-Yau Fibrations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151120T170000Z DTEND:20151120T180000Z DTSTAMP:20260828T094430Z UID:3l2onjguflenprsvok6qbmvln8@google.com CLASS:PUBLIC CREATED:20151113T153500Z DESCRIPTION:Nicholas Grabon\, JQI\, QuICS\n\n (Free lunch served at 11:45)\ n\nChains of Josephson junctions: A resource for new physics and better dev ices\n\nSuperconducting qubits are shaping up to be promising candidates fo r a potential quantum computer. In addition to this specific value\, the pr ocess of engineering such devices creates new elements for quantum circuits \, reveals new paths for probing novel physics\, and forces the development of techniques required to successfully work in the quantum regime. In this talk I will talk about one superconducting qubit in particular\, fluxonium . I will describe how the development of Josephson junction chains led to v ery large inductance elements and in turn an opportunity to explore the ult rastrong coupling regime in the Jaynes-Cummings Hamiltonian. I will finish with a high level description of the experimental methods used to create th ese devices and view the interesting phenomena. LAST-MODIFIED:20151113T153501Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141029T200000Z DTEND:20141029T210000Z DTSTAMP:20260828T094430Z UID:r0s66o6bg9seb5qs5v6tje6gp8@google.com CREATED:20141024T182926Z DESCRIPTION:Speaker Name: Kevin Pedro\n\nSpeaker Institution: University of Maryland\n\nTitle: Search for Third-Generation Scalar Leptoquarks and R-Pa rily Violating Top Squarks\n\nAbstract: A search for pair production of thi rd-generation scalar leptoquarks and supersymmetric top quark partners\, to p squarks\, in final states involving tau leptons and bottom quarks is pres ented. The search uses events from a data sample of proton-proton collision s corresponding to an integrated luminosity of 19.7 inverse femtobarns\, co llected with the CMS detector at the LHC with sqrt(s)=8 TeV. The number of observed events is found to be in agreement with the expected standard mode l background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level\, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition\, this mass limit applies directly to top squarks decaying via an R-parity vi olating coupling lambda'[333]. The search also considers a similar signatur e from top squarks undergoing a chargino-mediated decay involving the R-par ity violating coupling lambda'[3jk]. Each top squark decays to a tau lepton \, a bottom quark\, and two light quarks. Top squarks in this model with ma sses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date\, and this is the first s earch for top squarks decaying via lambda'[3jk].\n\nJoin with Google Hangou ts: https://hangouts.google.com/hangouts/_/physics.umd.edu/high-energy?hcei d=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.r0 s66o6bg9seb5qs5v6tje6gp8&hs=121 LAST-MODIFIED:20141024T182926Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160219T171000Z DTEND:20160219T181000Z DTSTAMP:20260828T094430Z UID:3thhaug9a5moe4c3lff1m6qt3g@google.com CLASS:PUBLIC CREATED:20160212T133740Z DESCRIPTION:Speaker Name: Efim Rozenbaum\n\nSpeaker Institution: JQI\, CMTC \n\nTitle: Dynamical Localization of Coupled Relativistic Kicked Rotors.\n\ nAbstract: A periodically-driven rotor is a prototypical model that exhibit s a transition to chaos in the classical regime and dynamical localization (related to Anderson localization) in the quantum regime. In a recent prepr int\, arXiv:1506.05455\, Keser et al. considered a many-body generalization of coupled quantum kicked rotors\, and showed that in the special integrab le linear case\, dynamical localization survives interactions. By analogy w ith many-body localization\, the phenomenon was dubbed dynamical many-body localization. In the present work\, we study a non-integrable model of coup led quantum relativistic kicked rotors. We find that the interacting model exhibits dynamical localization in certain parameter regimes\, which arises due to a complicated interplay of genuine Anderson mechanism and limiting integrable dynamics. This analysis of coupled "kicked" Dirac equations indi cates that dynamical few- and many-body localization can exist in non-integ rable systems and as such represents a generic phenomenon. We also analyze quantum dynamics of the model\, which for certain model's parameters exhibi ts highly unusual behavior - e.g.\, superballistic transport and peculiar s pin dynamics.\n\n (Free lunch served at 12:00) LAST-MODIFIED:20160218T125746Z LOCATION:PSC 2136 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141027T190000Z DTEND:20141027T203000Z DTSTAMP:20260828T094430Z UID:e67mtsaap86t1uln54dpbbh0lg@google.com CREATED:20140805T151412Z DESCRIPTION:Title: Composite Higgs boson from top dynamics\n\nSpeaker: Bogd an Dobrescu\, Fermilab\n\nAbstract: The Higgs boson may be a composite part icle\, made of a top quark and a vectorlike quark. The binding should be no n-confining\, and may be provided by a new \nspontaneously-broken gauge int eraction. I will show that the Higgs boon can arise as \nthe pseudo Nambu-G oldstone boson of the chiral symmetry associated with the vector-like \nqua rk and the top quark. Its mass can be computed\, and is consistent with the value of 125 GeV measured by the CMS and ATLAS collaborations.\n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/e pt-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ2 9vZ2xlLmNvbQ.e67mtsaap86t1uln54dpbbh0lg&hs=121 LAST-MODIFIED:20141021T200721Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141020T150000Z DTEND:20141020T160000Z DTSTAMP:20260828T094430Z UID:ohdno99q2j1d4etqqq2sefgn0c@google.com CREATED:20140711T171920Z DESCRIPTION:Speaker Name: David DeMille\n\nSpeaker Institution: Yale Univer sity\n\nTitle: Direct laser cooling and trapping of diatomic molecules\n\n Abstract: The advent of laser cooling and trapping ignited a scientific re volution in atomic physics. It was long considered a practical impossibili ty to extend these methods to diatomic molecules. Here\, unlike in atoms\, photon absorption can excite the internal degrees of freedom (vibration and rotation)\, which both interrupts the optical cycling needed for motional cooling and leads to internal-state heating. Our group recently demonstrat ed that\, nevertheless\, methods very similar to those of standard atomic l aser cooling and trapping can be applied to some molecules. We have achiev ed sub-Doppler cooling in 1-D\, radiation pressure slowing and stopping of a molecular beam\, and most recently 3-D magneto-optical trapping of SrF mo lecules. This promises to open a wide range of scientific applications\, f rom precision measurements to quantum information and quantum simulation\, to precise control over chemical reactions. In this talk I will discuss ou r methods and results\, and give an outlook on future directions arising fr om this work.\n\nHost: Luis Orozco\n\n\nJoin with Google Hangouts: https:// hangouts.google.com/hangouts/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYT c1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ohdno99q2j1d4e tqqq2sefgn0c&hs=121 LAST-MODIFIED:20140925T193108Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150129T203000Z DTEND:20150129T213000Z DTSTAMP:20260828T094430Z UID:1sbvif5ufk4sb33m8sd5se0sd8@google.com CREATED:20150127T192954Z DESCRIPTION:Possible topics: "Notes On Supermanifolds and Integration"\,\na rxiv: 1209.2199\, and/or\, “Torsion Constraints in Supergeometry”\, \nComm. Math. Phys. 133 (1990)\, no. 3\, 563–615. There is a short expository\nve rsion at arxiv:math/0108125.\n\n LAST-MODIFIED:20150127T193132Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Organizational meeting for the spring semester TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T180000Z DTEND:20150415T190000Z DTSTAMP:20260828T094430Z UID:5m6kogsk8ma60beo92dlqse91g@google.com CREATED:20150323T154259Z DESCRIPTION:Speaker Name: Fernando G.S.L. Brandao \n\nSpeaker Institution: (Microsoft Research and University College London)\n\nTitle: Quantum Gibbs Samplers\n\nAbstract: In this talk I’ll present recent results relating th e time of preparation of thermal states by quantum Gibbs samplers\, the\nan alogue of classical metropolis sampling. In particular I will connect the e fficiency of quantum Gibbs samplers to the static properties of the thermal state\, in particular whether it has a finite correlation length.\n\nThe g oal is to generalize to the quantum case a sequence of beautiful works -- b y Stroock\, Zergalinski\, Martinelli and others -- in mathematical physics and statistical mechanics showing the equivalence of mixing in time (fast c onvergence of the Glauber dynamics) to mixing in space (finite correlation length in the Gibbs state) for classical models.\n\nThe talk will be based on joint work with Michael Kastoryano.\n LAST-MODIFIED:20150401T201630Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150213T180000Z DTEND:20150213T190000Z DTSTAMP:20260828T094430Z UID:kcaj4b78a34vb6u760ih1rol1s@google.com CREATED:20150130T204220Z DESCRIPTION:Speaker Name: Christine Selhube-Unkel\n\nSpeaker Institution : University of Kiel\n\nTitle: Advanced Force Microscopy Techniques for Inve stigating Cellular Interactions at the Nanoscale\n\nAbstract: In order to systematically investigate the contact between cells and materials\, it is essential to develop techniques that allow studying adhesion at the cellula r and sub-cellular level. We are using an AFM-based method that is capable of characterizing the adhesion forces of cells with Piconewton resolution a t timescales from a few seconds to many days. In the experiments\, we attac h a spread cell to a tipless\, protein-coated cantilever. After cell attach ment\, the cantilever is retracted and the detachment force is recorded.\n\ nWe have recently applied this method to quantify the adhesion strength of fibroblast cells to nanostructured surfaces that provide anchorage points f or single cellular receptor proteins (integrins) in a quasi-hexagonal latti ce with nanometre resolution. By analysing the adhesion forces\, we found t hat the nano-scale spacing between individual integrins in the cell membran e controls the strength of cell adhesion\, the stability of adhesion cluste rs and cell elasticity\n LAST-MODIFIED:20150130T204220Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160219T160000Z DTEND:20160219T170000Z DTSTAMP:20260828T094430Z UID:qu0v4mmhbd0bvuh84n0reg3nsk@google.com CREATED:20160114T190121Z DESCRIPTION:Speaker Name: Aram Harrow\n\nSpeaker Affiliation: MIT\n\nTitle: Limitations of monogamy\, Tsirelson-type bounds\, and other semidefinite p rograms in quantum information\n\nAbstract: We introduce a new method for p roving limitations on the ability of semidefinite programs (SDPs) to approx imately solve optimization problems. We use this to show specifically that SDPs have limited ability to approximate two particularly important sets in quantum information theory: \n1. The set of separable (i.e. unentangled) s tates. \n2. The set of quantum correlations\; i.e. conditional probability distributions achievable with local measurements on a shared entangled stat e. \nIn both cases no-go theorems were previously known based on computatio nal assumptions such as the Exponential Time Hypothesis (ETH) which asserts that 3-SAT requires exponential time to solve. Our unconditional results a chieve the same parameters as all of these previous results (for separable states) or as some of the previous results (for quantum correlations) and s how that any SDPs which approximately solve either of these problems must h ave a number of variables which grows very quickly with problem size. \nThe se results can be viewed as limitations on the monogamy principle\, the PPT test\, the ability of Tsirelson-type bounds to restrict quantum correlatio ns\, as well as the SDP hierarchies of Doherty-Parrilo-Spedalieri\, Navascu es-Pironio-Acin and Berta-Fawzi-Scholz. Indeed a wide range of past work in quantum information can be described as using an SDP on one of the above t wo problems and our results put broad limits on these lines of argument.\n\ nThis is joint work with Anand Natarajan and Xiaodi Wu. LAST-MODIFIED:20160212T194616Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141016T173000Z DTEND:20141016T180000Z DTSTAMP:20260828T094430Z UID:kf2c7sjlbg3p8b58qe4r6i5kfs@google.com CREATED:20140828T214831Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.kf2c7sjlbg3p8b58qe4r6i5kfs&hs=121 LAST-MODIFIED:20140828T214831Z LOCATION:phys room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160218T203000Z DTEND:20160218T220000Z DTSTAMP:20260828T094430Z UID:aiq3h7isp5cue92mn3u0sn7aek@google.com CREATED:20160212T142728Z DESCRIPTION:Speaker: Chuck Doran (Alberta and UMCP) - \n LAST-MODIFIED:20160212T142728Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mirror symmetry (cont.) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151109T190000Z DTEND:20151109T200000Z DTSTAMP:20260828T094430Z UID:620tstk22mskhqkc405it3h5ts@google.com CREATED:20151021T132015Z DESCRIPTION:Speaker: Thorben Graf\n\nSpeaker Institution: Goethe-University Frankfurt\n\nTitle: pQCD thermodynamics with massive quarks\n\nAbstract: R esults for several thermodynamic quantities within the next-to-leading\nord er calculation of the thermodynamic potential in perturbative QCD at\nfinit e temperature and chemical potential including non-vanishing quark\nmasses are presented. These results are compared to lattice data and to\nhigher-or der optimized perturbative calculations to investigate the trend\nbrought a bout by mass corrections. Furthermore\, the findings of the\ninvestigation of the thermodynamics at nonzero isospin density for cold\nQCD are also pre sented. LAST-MODIFIED:20151109T152755Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151002T160000Z DTEND:20151002T170000Z DTSTAMP:20260828T094430Z UID:6vi6vrc8bigma4sjop3v291d88@google.com CLASS:PUBLIC CREATED:20150925T133503Z DESCRIPTION:Speaker Name: Steve Ragole\n \nSpeaker Institution: JQI\, QuICS \n\nTitle: Cold Atoms in Rings: Luttinger Liquids and Rotation Sensing\n\nA bstract: Recent experiments have realized ring shaped traps for ultracold a toms in which the atoms can be manipulated in many interesting ways. These traps suggest an analogy to SQUIDs which have been used for precision sensi ng for decades. While cold atoms have also been very successful in sensing\ , in typical cold atom interferometers atomic interactions are an obstacle to sensitivity. I'll explore the possibility that interactions could be he lpful in engineering the entanglement necessary to enhance sensitivity over a small bandwidth. In particular\, I consider a 1D ring of cold atoms with a moving weak barrier within the framework of Luttinger liquid theory. I'l l give a brief introduction to Luttinger Liquid theory and show that strong ly repulsive atoms can be made into a entanglement-enhanced rotation sensor . I’ll comment on noise and give a comparison with traditional atom interfe rometers.\n LAST-MODIFIED:20150925T133503Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-CMTC-QuICS Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150218T153000Z DTEND:20150218T163000Z DTSTAMP:20260828T094430Z UID:01i0k0vh739e61oscdje814og4@google.com CLASS:PUBLIC CREATED:20150212T194601Z DESCRIPTION:Speaker Name: Jeff Thompson \n\nSpeaker Institution:Massachuset ts Institute of Technology\n\nTitle: Nanoscale quantum systems with single atoms and photons\n\nAbstract: Strong interactions between light and atoms at the single-quantum level are an important ingredient for quantum technol ogies\, and for studies of complex many-particle quantum systems. In this t alk\, I will describe the development of a novel experimental platform that allows for trapping a single rubidium atom in the evanescent mode of a nan o-fabricated optical cavity with sub-wavelength dimensions. By virtue of th eir small size\, these cavities provide extremely large atom-photon couplin g strengths and good prospects for scalability and integration into complex quantum optical circuits. Positioning the atom near the nano-structure is accomplished using a scanning optical tweezer dipole trap. As a first appli cation\, we have demonstrated a coherent optical switch\, where a single ga te photon controls the propagation of many subsequent signal photons\, with the interaction mediated by the atom and cavity. We have also shown that t he optical response of the combined atom-cavity system is nonlinear at the level of one or two photons. I will close by discussing prospects for exten sions with many atoms to realize large-scale quantum networks and create co mplex entangled states. LAST-MODIFIED:20150213T161051Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141122T010000Z DTEND:20141122T020000Z DTSTAMP:20260828T094430Z UID:8ptq26eouujn62mqj7i1d4urv4@google.com CREATED:20141119T202516Z DESCRIPTION:Defining Fundamental Constants of Nature: the New SI\nPowell Au ditorium\, adjacent to the Cosmos Club\n2170 Florida Avenue NW\, Washington DC\nhttp://www.philsoc.org/index.html\n\nJoin with Google Hangouts: https: //hangouts.google.com/hangouts/_/physics.umd.edu/lecture-by?hceid=bGJrNjYwY Tc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.8ptq26eouujn6 2mqj7i1d4urv4&hs=121 LAST-MODIFIED:20141119T202553Z LOCATION:Powell Auditorium/Cosmos Club\, 2170 Florida Avenue NW\, Washingto n DC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lecture by David B. Newell\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140505T200000Z DTEND:20140505T210000Z DTSTAMP:20260828T094430Z UID:l0h3jjqam1t27vb6ep0lr280u8@google.com CREATED:20140325T182907Z DESCRIPTION:Speaker Name: Orit Lavi\n\nSpeaker Institution : NIH\n\nTitle: Regulation motifs balance transcription and degradation to regulate protei n concentrations in cellular networks\n\nAbstract: Intratumoral heterogene ity has been found to be a major cause of drug resistance. Cell-to-cell var iations increase as a result of cancer-related alterations\, that are acqui red by the stochastic process and induced by environmental signals. However \, most robust cellular mechanisms include natural fluctuations that are cl osely regulated\, and thus lead to asynchronition of the cells and cause in trinsic heterogeneity in a given population. One such cellular process is t he cell cycle. In order to maintain an ordered cyclic mechanism that would function consistently despite a routinely noisy microenvironment\, a typica l variation in gene expression\, in the cell-cycle and death periods\, in t he cell size and age of cells from the same clone must naturally exist. In this talk we will discuss how the specific feedback loops studied for a lim ited number of proteins that describe the cell cycle are actually part of a comprehensive mechanism that regulates the intra-cellular protein concentr ations. Excessive high protein concentrations are known to be the source of various degenerative diseases such as Alzheimer and Parkinson\, and even c ancer. Thus\, it is of critical importance to uncover such regulation mecha nisms. Our proposed regulation motifs reveal another layer in the cellular architecture\, and are a step toward formation of a comprehensive picture o f the intra-cellular dynamics. LAST-MODIFIED:20140505T133559Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141124T210000Z DTEND:20141124T220000Z DTSTAMP:20260828T094430Z UID:fluhn2nm21ivs6g47ihm301j88@google.com CREATED:20141117T145835Z DESCRIPTION:Speaker Name: Herbert Levine\n\nSpeaker Institution : Rice Univ ersity\n\nTitle: The Genetics and Biophysics of the Epithelial-Mesenchymal Transition (EMT): Can Theory Help Cancer Biology?\n\nAbstract: In order t o spread from the primary tumor to distant sites\, cancer cells must underg o a coordinated change in their phenotypic properties referred to as the "e pithelial-to-mesenchymal" transition. We have studied the nonlinear geneti c circuits that are responsible for this cellular decision-making progress and propose that the transition actually goes through a series of intermed iate states. At the same time\, we have formulated motility models which al low for the correlation of state of this network and the cell's biophysical capabilities. Hopefully\, these thereby efforts will help us better unders tand the transition to metastatic disease and possible treatments thereof.\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/biophysics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2Fs ZW5kYXIuZ29vZ2xlLmNvbQ.fluhn2nm21ivs6g47ihm301j88&hs=121 LAST-MODIFIED:20141117T145835Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140819T143000Z DTEND:20140819T163000Z DTSTAMP:20260828T094430Z UID:5aoggdbmgmhaub2fedv5r4rnc8@google.com CREATED:20140813T134022Z DESCRIPTION:Notice of Doctoral Defense for Jonathan Hoffman\n\nDissertation Title: "Atoms Coupled to Superconducting Qubits: Optical Nanofiber Fabric ation and Analysis"\n\nDissertation Committee Chair: Prof. Luis Orozco\n\n Join with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.u md.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW 5kYXIuZ29vZ2xlLmNvbQ.5aoggdbmgmhaub2fedv5r4rnc8&hs=121 LAST-MODIFIED:20140813T200119Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141007T163000Z DTEND:20141007T173000Z DTSTAMP:20260828T094430Z UID:jsuhn2oq2ec0r1rvopphh00fns@google.com CREATED:20140930T133930Z DESCRIPTION:Speaker: Gregor Tanner \n\nSpeaker Institution: School of Ma thematical Sciences\, University of Nottingham UK\n\nTitle: Propagation of noisy wave fields in complex systems with applications in electromagnetism and vibro-acoustics\n\nhttp://www.nottingham.ac.uk/Mathematics/People/greg or.tanner\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/lbk660a75b8jh7e?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1Z TBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jsuhn2oq2ec0r1rvopphh00fns&hs=121 LAST-MODIFIED:20140930T145022Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:special Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150128T203000Z DTEND:20150128T213000Z DTSTAMP:20260828T094430Z UID:3bpk79f4sqdhra909hil1vqha4@google.com CREATED:20150123T215334Z DESCRIPTION:Speaker Name: Dr. Agis A. Iliadis\n\nSpeaker Institution : ECE Department\, UMCP\n\nTitle : Heterojunction Nanosensors and Surface Acousti c Wave Sensors: Advances and Applications for Monolithic Integration in CMO S Technology\n\nAbstract : Nanostructured ZnO-(100) Si heterojunction nanos ensors for tunable gas/chemical sensing delivered by diblock copolymer self -assembly\, and ZnO nano-films of controllable high quality and doping depo sited on (100) Si by Pulsed Laser Deposition (PLD) provided ultra-sensitive Surface Acoustic Wave (SAW) biosensors. The unique approach to nano-manufa cturing for cost effective applications of electronically functional self-a ssembled (SA) nanostructures on any large area substrate using this copolym er nanostructure delivery technology is key not only to high performance na no-sensing but has potential also to photovoltaics\, light emitting systems \, and quantum computing. \n\nAcknowledgements: The support of this work by NSF through grant #ECS0823996 is gratefully acknowledged.\n\nNotes: For gu ests attending the LPS seminar\, please use the phone on the left hand side of the front door to call the receptionist for entry. LPS is located at 80 50 Greenmead Drive in College Park. There is parking at LPS and overflow pa rking at the adjacent LTS building but not at the 4H building. LPS is on th e UMCP shuttle route\; take #105 for the Courtyard Apts.\n \n LAST-MODIFIED:20150123T215334Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151009T160000Z DTEND:20151009T170000Z DTSTAMP:20260828T094430Z UID:2aojkiu3gokabht5fnkgko17r0@google.com CLASS:PUBLIC CREATED:20150930T155055Z DESCRIPTION:Speaker Name: Elizabeth Goldschmidt\n \nSpeaker Institution: JQ I\n \nLocation and Time: PSC 2136 at 12:00pm (Free lunch served at 11:45)\n \nTitle: Broadening in many-body multi-level Rydberg systems\n\nAbstract: R ydberg atoms exhibit strong\, controllable\, long-range interactions that a re of great interest for quantum information applications and studies of ma ny-body physics. However\, most theoretical treatments of Rydberg systems i gnore their multi-level nature and its role in spontaneous decay and light scattering. We study Rydberg excitation of atoms in dense cloud of 87Rb ato ms trapped in a 3D optical lattice and observe dramatic broadening of the t wo-photon 5s-18s Rydberg transition. We attribute the broadening to dipole- dipole interactions of 18s atoms with atoms in nearby Rydberg states popula ted by spontaneous decay from the 18s. The presence of these spontaneously created atoms dramatically affects the ability to coherently address the tr ansition of interest either resonantly or with detuned light intended to mi x the ground and Rydberg state\, a popular idea known as Rydberg dressing. I will present experimental data showing nearly two orders of magnitude of broadening\, and correspondingly altered scattering rates\, and discuss the various effects of this phenomenon on many-body Rydberg physics. LAST-MODIFIED:20150930T155056Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-CMTC-QuICS Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150326T170000Z DTEND:20150326T183000Z DTSTAMP:20260828T094430Z UID:7k74ni2b97rmim0d700774d1q0@google.com CREATED:20150320T180141Z DESCRIPTION:Speaker Name: Markus Klute\n\nSpeaker Institution : Massachuset ts Institute of Technology\n\nTitle : "Exploiting the LHC Physics Potential "\n LAST-MODIFIED:20150320T180303Z LOCATION:PSC Room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T163000Z DTEND:20140327T173000Z DTSTAMP:20260828T094430Z UID:u0qbu82gdta91mu2i2d4djcdj0@google.com CREATED:20140326T172713Z DESCRIPTION:Speaker Name: Roldan Pozo\n\nSpeaker Institution: NIST\n\nTit le: A network measure for the analysis of large-scale graphs\n\nAbstract: Given an undirected graph\, we describe a two-dimensional integer-valued m easure\, the Q-matrix\, based on the connected component size distribution of its degree-limited subgraphs. This generalization of the degree distribu tion yields a small sparse matrix whose values the number of connected comp onents of a particular size during a prescribed percolation process. When v iewed as a two-dimensional histogram\, this matrix yields a canonic visual representation\, i.e. an identification portrait\, revealing important netw ork properties. It can be used as a baseline classification tool\, as netwo rks from particular application areas (e.g. co-authorship networks\, citati on networks\, peer-to-peer networks) look similar under this transformation . Finally\, this network measure can be used as an analysis tool to help di stinguish between real-data networks and random graphs with the same degree -distribution (configuration model) or joint-degree distribution. LAST-MODIFIED:20140326T172713Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140421T150000Z DTEND:20140421T163000Z DTSTAMP:20260828T094430Z UID:00e3ae3o1vgckih3kek8nfpdrk@google.com CREATED:20140102T150351Z DESCRIPTION:Speaker:Bruno Laburthe-Tolra\, Laboratoire de Physique des Las ers – Paris 13 University & CNRS – UMR 7538\n\nTitle:Magnetic properties of chromium dipolar condensates \n\nAbstract: In this seminar\, I will descr ibe an experiment where magnetic atoms in different sites of a 3D optical l attice undergo spin-exchange processes due to long-range dipole-dipole inte ractions. \nA Bose-Einstein condensate of Chromium atoms is loaded into dee p 3D optical lattices. Due to their large magnetic dipole moment\, Chromium atoms interact at long distance via dipole-dipole interactions. These inte ractions provide intersite spin-spin interactions without relying on super- exchange energies\, which constitutes a great interest for the study of spi n lattice models. In our experiment\, we observe a non-equilibrium spinor d ynamics resulting from inter-site Heisenberg-like spin-spin interactions pr ovided by non-local dipole-dipole interactions. Our experiment thus reveal s the interest of chromium lattice gases for the study of quantum magnetism of high-spin systems. \nI will also show that the anisotropy of dipolar in teractions introduces the possibility of magnetization-changing collisions. In a lattice\, these collisions may resonantly happen when the energy rele ased in a dipolar relaxation event (the Larmor energy\, tuned by the magnet ic field) matches the energy for band excitation. Dipolar interactions thus introduce an intrinsic non-linear spin-orbit coupling which may qualitativ ely modify the study of quantum magnetism.\n\nHost: Trey Porto LAST-MODIFIED:20140416T154858Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160331T193000Z DTEND:20160331T210000Z DTSTAMP:20260828T094430Z UID:qo6spnahkvieq2e30c9j6nt4mk@google.com CREATED:20160226T160201Z DESCRIPTION:Speaker: Amin Gholampour (UMCP) - \n LAST-MODIFIED:20160226T160201Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:On the proof of Yau-Zaslow conjecture by Klemm-Maulik-Pandhripande- Scheidegger TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141106T163000Z DTEND:20141106T173000Z DTSTAMP:20260828T094430Z UID:sok790j3kku3ilrelfkdb6mpbk@google.com CREATED:20141103T164313Z DESCRIPTION:Speakers: Ilke Arslan\, Bruce Arey\, and Marvin Warner\n\nSpeak er Institution: Pacific Northwest National Laboratory\n\nTitle: High resol ution and 3-D Characterization and Lithography of Nanomaterials at PNNL\n\n Abstract: The ability to synthesize and manipulate nanostructures is a core issue in the design and implementation of next generation devices. In orde r to understand materials science impacts on device performance\, a detaile d understanding of the morphology and chemistry of interfaces and bulk mate rials is required. In this presentation\, we will discuss some key characte rization methods used at PNNL for these purposes\, including high resolutio n imaging in the scanning transmission electron microscope (STEM) (2-D proj ection imaging with 1Å spatial resolution)\, electron tomography in the STE M (3-D electron imaging with sub-nm resolution)\, atom probe tomography (AP T) (3-D chemical imaging with sub-nm resolution)\, and helium-ion microscop y (HIM) (3.5Å resolution\, surface imaging). We will also highlight the lit hography capabilities of the HIM for resists and direct write capabilities with a 3.5Å-sized source. HIM with a pattern generator and a gas injection system enables three new nanofabrication technologies: direct write\, scan ning helium ion beam lithography\, and helium ion beam induced processing. Scanning He-ion beam lithography (SHIBL) on HSQ and PMMA resist layers are demonstrated to have very high resolution and superior low proximity effect as compared to electron beam lithography.\nNote: For guests attending the LPS seminar\, please use the phone on the left hand side of the front door to call receptionist for entry DO NOT PARK IN THE 4H LOT\; Use the UMD shut tle instead\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/h angouts/_/physics.umd.edu/lab-for?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTB AZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.sok790j3kku3ilrelfkdb6mpbk&hs=121 LAST-MODIFIED:20141105T182251Z LOCATION:Lab for Physical Sciences (downstairs conference room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140604T230000Z DTEND:20140605T000000Z DTSTAMP:20260828T094430Z UID:lgh48s02rcl8jie543jfd4p2r0@google.com CREATED:20140529T150129Z DESCRIPTION:From the Mathematics of Supersymmetry to the Music of Arnold Sc hoenberg\nDr. S. James Gates Jr.\, University of Maryland. \nhttp://www.per imeterinstitute.ca/outreach/general-public/public-lecture-series\nFor an em ail reminder:\nhttp://storage.coremotivesmarketing.com/library/348db461-cff 4-4d25-81c3-182fa9e07de1/709/webforms/79dd31f4-4ee0-e311-857b-005056800012. htm LAST-MODIFIED:20140529T150837Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Live webcast: Jim Gates TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140403T180000Z DTEND:20140403T193000Z DTSTAMP:20260828T094430Z UID:b0b86qurf8dgc6ro6c11gtfbdo@google.com CREATED:20140212T163721Z DESCRIPTION:Speaker: Steven M. Anlage\, CNAM\, Physics Department\, Univer sity of Maryland\n\nInstitution: University of Maryland\n\nTitle: The Anis otropic Nonlinear Meissner Effect – A New Superconducting Gap Node Spectros copy\n\nAbstract: One of the first questions asked when a new superconduct or is discovered is whether it has a non-trivial superconducting gap functi on on the Fermi surface. One signature of un-conventional pairing is the p resence of nodes in the gap function\, giving rise to anisotropic electrody namic properties\, among other things. We have directly imaged the anisotr opic nonlinear Meissner effect in an unconventional superconductor through the nonlinear electrodynamic response of both (bulk) gap nodes and (surface ) Andreev bound states. A superconducting thin film is patterned into a com pact self-resonant spiral structure\, excited near resonance in the radio-f requency range\, and scanned with a focused laser beam perturbation. At low temperatures\, direction-dependent nonlinearities in the reactive and resi stive properties of the resonator create photoresponse that maps out the di rections of nodes\, or of bound states associated with these nodes\, on the Fermi surface of the superconductor. The method is demonstrated on the nod al superconductor YBa2Cu3O7-d and the results are consistent with theoretic al predictions for the bulk and surface contributions. Further tests of th e dc magnetic field dependence of the photoresponse are underway. The expe riment is being re-designed to investigate new bulk superconductors where t he pairing symmetry and existence of nodes in the energy gap are not yet kn own.\n\nHost: (local)\n\n\n\n\n\n\n LAST-MODIFIED:20140212T163721Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120427T170000Z DTEND:20120427T180000Z DTSTAMP:20260828T094430Z UID:kannp81d6l3a072t9haoik9p38@google.com CREATED:20120420T194746Z DESCRIPTION:Title: Imaging Magnetic Nanostructures with Spin-Polarized Elec trons\nSpeaker: John Unguris\, Project Leader\nElectron Physics Research Gr oup\nCNST LAST-MODIFIED:20120420T194756Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140303T213000Z DTEND:20140303T223000Z DTSTAMP:20260828T094430Z UID:e0h6q6hvhbk1ksvvbgn8163pas@google.com CREATED:20140203T160552Z DESCRIPTION:Speaker Name: Nat Gopalswamy\n\nSpeaker Institution : NASA\, GS FC\n\nTitle: TBA\n\nNotes: Tea and Cookies 4:15-4:30 pm\n\n LAST-MODIFIED:20140301T042529Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141120T203000Z DTEND:20141120T213000Z DTSTAMP:20260828T094430Z UID:4hqk4lr8olu4o836vninf4sn9o@google.com CREATED:20141114T144735Z DESCRIPTION:Speaker: Jonathan Rosenberg (UMd) - http://www2.math.umd.edu/~j mr/\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ physics.umd.edu/more-on-the?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jvd XAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.4hqk4lr8olu4o836vninf4sn9o&hs=121 LAST-MODIFIED:20141114T144735Z LOCATION:Physics 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:More on the supersymmetric oscillator and related examples TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141111T181500Z DTEND:20141111T193000Z DTSTAMP:20260828T094430Z UID:b32a0r0m88vt7acq68c0jbdr38@google.com CREATED:20141031T132111Z DESCRIPTION:Speaker Name: Dr. Yuhai Tu\n\nSpeaker Institution : IBM Watson Research Center\n\nTitle: Thermodynamics of Sensory Adaptation and the Ener gy-Speed-Error Tradeoff\n\n\n\n\nJoin with Google Hangouts: https://hangout s.google.com/hangouts/_/physics.umd.edu/informal?hceid=bGJrNjYwYTc1YjhqaDdl azZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.b32a0r0m88vt7acq68c0jbdr 38&hs=121 LAST-MODIFIED:20141031T132111Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140326T173000Z DTEND:20140326T190000Z DTSTAMP:20260828T094430Z UID:peto9nb9avsg24t0vj6vf66b74@google.com CREATED:20140304T203857Z DESCRIPTION:Title: Self-force via worldline integration: from extreme mass ratio\ninspirals to cosmic strings\n\nSpeaker: Barry Wardell\, Cornell\n\nA bstract: Of the potential sources of gravitational waves\, two of the most\ nfascinating candidates are compact-object binary systems and cosmic\nstrin gs. Binary systems typically involve a pair of neutron stars or\nblack hole s inspiralling and coalescing to produce a single remnant.\nOn the other ha nd\, cosmic strings are a generic feature predicted by a\nlarge number of c osmological models and fundamental physics\; like\nbinary systems their exi stence is expected to generate large amounts\nof gravitational radiation.\n \nAlthough these two phenomena are quite distinct in their origins and\nphy sical features\, both can be modelled using closely related\ntechniques. Th is talk presents a novel approach to both problems which\ncombines new nume rical and analytical methods and yields geometrical\ninsight into the contr ibutions to self-interaction from curved\ngeometry (back-scattering) and tr apping of null geodesics. LAST-MODIFIED:20140319T145522Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140409T173000Z DTEND:20140409T190000Z DTSTAMP:20260828T094430Z UID:q4dsbbbnvae6q3c1a1i2sclc84@google.com CREATED:20140304T204018Z DESCRIPTION:Title: Holographic Thermalization\, Stability of AdS\, and the FPU Paradox\n\nSpeaker: Stephen Green\, PI/Guelph\n\nAbstract: For a real m assless scalar field in general relativity with a negative cosmological con stant\, we uncover a large class of spherically symmetric initial condition s that are close to AdS\, but whose numerical evolution does not result in black hole formation. According to the AdS/CFT dictionary\, these bulk solu tions are dual to states of a strongly interacting boundary CFT that fail t o ther- malize at late times. Furthermore\, as these states are not station ary\, they define dynamical CFT configurations that do not equilibrate. We develop a two-timescale perturbative formalism that captures both direct an d inverse cascades of energy and agrees with our fully nonlinear evolutions in the appropriate regime. We also show that this formalism admits a large class of quasi-periodic solutions. Finally\, we demonstrate a striking par allel between the dynamics of AdS and the classic Fermi-Pasta-Ulam-Tsingou problem. LAST-MODIFIED:20140401T211843Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160307T210000Z DTEND:20160307T223000Z DTSTAMP:20260828T094430Z UID:3j3m4u20e4ktp4fg7rnm5nc4eo@google.com CREATED:20160301T191607Z DESCRIPTION:Speaker: Daniel Harlow \n\nSpeaker Institution: Harvard \n\nTit le: Gauge Fields and Quantum Gravity\n \nAbstract: It has long been expecte d that the consistency of quantum gravity imposes interesting constraints o n electromagnetism. These expectations can be codified as a set of three c onjectures of increasing strength: the necessary existence of charged state s\, the complete population of the charge lattice allowed by the topology o f the gauge group\, and the weak gravity conjecture.\n\nIn this talk I will introduce a new paradox in AdS/CFT\, arising when one considers gauge fiel ds propagating in the two-sided AdS-Schwarzschild geometry\, whose resoluti on seems to require all three conjectures to hold. This thus provides a ne w argument for their validity\, and in the case of the weak gravity conject ure it clarifies what the conjecture should have been in the first place. The resolution I propose also has important implications for the emergence of the black hole interior\, and more generally for the connection between entanglement and spacetime that has received a lot of attention in recent y ears. LAST-MODIFIED:20160301T191607Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160325T161500Z DTEND:20160325T171500Z DTSTAMP:20260828T094430Z UID:8oanos9uprg7lhu3kd8r1opft4@google.com CREATED:20160318T134158Z DESCRIPTION:Speaker Name: Dr. Brian Anderson\n\nSpeaker Institution: JQI\n\ nFree lunch served at 12:00\n\nTitle: Squeezed Light\, Fast Light and Non-L inear Optics\n\nAbstract: We will discuss a variety of interesting phenomen a that have been demonstrated in non-linear optics experiments. In non-line ar optics (NLO)\, an atom’s response to an electric field is not necessaril y only proportional to the electric field. The atomic response could be pro portional to higher powers of the electric field\, as well. We have used a particular NLO process\, called Four-Wave Mixing\, to generate light with u ncertainty distributions that are ‘squeezed’\, and send pulses of light (bu t not information) faster than c. I will give an introduction in non-linear optics and quantum optics before discussing the results of recent experime nts where we generate squeezed light and fast light.\n LAST-MODIFIED:20160321T192845Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151208T181500Z DTEND:20151208T193000Z DTSTAMP:20260828T094430Z UID:4tleuedlosplvhpfns33kl9670@google.com CREATED:20151203T213758Z DESCRIPTION:Speaker Name: Andrew Smith\n\nSpeaker Institution : UMCP\n\nTit le : The nonequilibrium work relation for a quantum system in contact with a decohering thermal bath\n\nAbstract : The nonequilibrium work relation of fers a connection between irreversible work and equilibrium free energy dif ferences\, providing new insight into the second law of thermodynamics. Whi le the work relation has been thoroughly studied in classical settings\, it s extension to the quantum regime has focused mainly on closed (thermally i solated) systems and only recently has been verified experimentally. In thi s talk we analyze a special case of an open quantum system in contact with what we call a decohering bath\, and we show that in this situation the wor k relation is satisfied. We also present the experimental findings of our c ollaborators\, who used trapped ions to verify the work relation in the pre sence of decoherence. To our knowledge their results provide the first expe rimental test of the work relation for an open quantum system. \n\n LAST-MODIFIED:20151203T213959Z LOCATION:IPST building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140421T173000Z DTEND:20140421T183000Z DTSTAMP:20260828T094430Z UID:fg4q5n5s7qe69ujhsjpc62psjo@google.com CREATED:20140122T205732Z DESCRIPTION:Title: Unearthing excited hadron resonances in lattice QCD\n\nS peaker: Colin Morningstar\, Carnegie Mellon\n\nAbstract: Recent advances in computational techniques in lattice QCD have enabled unprecedented access for theoretical studies to QCD excited states. First results of stationary- state levels in several symmetry sectors using very large sets of both sing le-meson and two-meson operators are presented. Level identification using probe operators is discussed. LAST-MODIFIED:20140225T190909Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160331T163000Z DTEND:20160331T173000Z DTSTAMP:20260828T094430Z UID:h5ud0ah6kqf0n1knd8gmdl6iqk@google.com CREATED:20160324T153619Z DESCRIPTION:Speaker Name: Chris Jarzynski \n\nSpeaker Institution: Univers ity of Maryland\, Department of Chemistry and Biochemistry \n\nTitle:Shortc uts to adiabaticity in simple classical systems \n\nAbstract: Adiabatic inv ariants are important in classical mechanics\, quantum mechanics and thermo dynamics. I will consider the following classical problem in one degree of freedom. Given a time dependent Hamiltonian H(q\,p\,t)\, we wish to constru ct an auxiliary potential U(q\,t) with the property that all trajectories l aunched from a specified initial energy shell E_0 of H(q\,p\,0)\, and subse quently evolving under H(q\,p\,t) + U(q\,t)\, will end on a single energy s hell E_tau of H(q\,p\,tau). By Liouville’s theorem these two shells share t he same action. In this manner the auxiliary potential U(q\,t) steers the t rajectories so that the final action is exactly the same as the initial act ion\, for every trajectory and for arbitrarily fast time-dependence of H(q\ ,p\,t). I will present a simple solution to this problem and will discuss i ts relationship to analogous solutions for quantum systems. LAST-MODIFIED:20160328T153634Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150427T200000Z DTEND:20150427T213000Z DTSTAMP:20260828T094430Z UID:re8vq6pmbj83154ujgabr45kg4@google.com CREATED:20150204T143348Z DESCRIPTION:Speaker: Astrid Eichhorn\n\nSpeaker Institution: Imperial Colle ge\, London\n\nTitle: Zooming in on spacetime and matter - Renormalisation Group applications in fundamental physics\n\nAbstract: I will show how func tional Renormalisation Group tools can be used to address open questions in fundamental physics. As examples\, I will focus on the Higgs sector of the Standard Model\, as well as quantum gravity. In the former\, I will prese nt new results on the stability of the Higgs potential at high scales\, and the corresponding bounds on the Higgs mass. In the latter\, I will focus on asymptotically safe gravity\, where I will discuss phenomenologically re levant bounds on the allowed number of matter degrees of freedom. These cou ld allow to test quantum gravity at the LHC and beyond.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/astrid-ei chhorn?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.re8vq6pmbj83154ujgabr45kg4&hs=121 LAST-MODIFIED:20150423T173618Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150511T203000Z DTEND:20150511T213000Z DTSTAMP:20260828T094430Z UID:s09v9mr26ith0i5m42ghslnr94@google.com CREATED:20150501T142407Z DESCRIPTION:Speaker Name: Dr. Heli Hietala \n\nSpeaker Institution: Imperia l College London\n\nTitle: Ion temperature anisotropies in magnetotail rec onnection \n\nAbstract: Magnetic reconnection redistributes energy by rele asing magnetic energy into plasma kinetic energy - high speed bulk flows\, heating\, and particle acceleration. A significant portion of the energy re leased by magnetotail reconnection appears to go into ion heating\, and the heating is anisotropic with the plasma temperature parallel to the magneti c field generally increasing more than the perpendicular temperature. Simul ations and theory indicate that this temperature anisotropy can balance par t of the magnetic tension force that accelerates the jet\, and may even exc eed it leading to firehose instability.\n\nWe examine ARTEMIS dual-spacecra ft observations of a long-duration magnetotail exhaust generated by anti-pa rallel reconnection in conjunction with Particle-In-Cell simulations\, show ing spatial variations in the anisotropy across the outflow far downstream (>100 ion inertial lengths) of the X-line. A consistent pattern is found in both the spacecraft data and the simulations: whilst the total temperature across the exhaust is rather constant\, near the boundaries the parallel t emperature dominates. The plasma is well-above the firehose threshold in po rtions of the exhaust\, suggesting that the drive for the instability is st rong and the instability is too weak to relax the anisotropy. In contrast\, the perpendicular temperature dominates at the mid-plane\, indicating that (1) the increase in perpendicular heating is not simply the result of scat tering\, and (2) despite the large distance to the X-line\, particles under go Speiser-like motion. We also analyse the characteristics of the partic le distributions leading to these anisotropies at different distances from the mid-plane.\n\n\n LAST-MODIFIED:20150507T143138Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space/Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140505T173000Z DTEND:20140505T190000Z DTSTAMP:20260828T094430Z UID:t7djkr2abn46sp00o44uunbjm8@google.com CREATED:20140415T204506Z DESCRIPTION:Speaker Name: Jianwei Qiu\n\nSpeaker Institution: Brookhaven \n \nTitle: Jet vs. Jettiness - the event shape in high energy scattering\n\nA bstract: Jet is known as the "footprint" of high energy quark and gluon pro duced in high energy scattering\, and has been an excellent probe for short -distance dynamics of QCD and potential new physics. Jet quenching is reco gnized as a key evidence for the discovery of quark-gluon plasma in relativ istic heavy ion collisions. However\, quantifying the jet quenching in a h ot and dense medium is challenging due to the definition of the jet itself and its phase space limitation. In this talk\, I propose to use the jettin ess\, a more inclusive observable for global event shape\, to quantify the jet quenching phenomenon and final-state QCD radiation when the jet passes through various nuclear mediums. The nuclear dependence of the event shape provides a powerful probe of color dynamics: propagation\, interaction and radiation.I present\, as an example\, a factorization formalism to study t he jettiness of event shape in terms of soft-collinear effective theory for the kinematics of a future Electron-Ion Collider. Effort for studying the jettiness in relativistic heavy ion collisions is also discussed. LAST-MODIFIED:20140501T133428Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150917T180000Z DTEND:20150917T193000Z DTSTAMP:20260828T094430Z UID:4pj6sot916jl0349gego6lhk3o@google.com CREATED:20150729T141504Z DESCRIPTION:SPEAKER: Daniel Agterberg\, University of Wisconsin-Milwaukee\n \nTITLE: Superconductivity without parity symmetry\n\nABSTRACT: Two key sym metries underlie the formation of superconductivity: parity and time revers al. Breaking time reversal symmetry through the application of magnetic fie lds is known to be harmful to superconductors. The role of breaking parity symmetry is less well understood. However\, this has become an important is sue with the recent discovery of superconductivity at interfaces and with t he large number of superconductors with structures that lack parity symmetr y. In this talk\, after a discussion on the role of symmetry on superconduc tivity\, I will contrast the physics with and without parity symmetry. This will include: the spin susceptibility in the superconducting state\; the a ppearance of nodes in the superconducting gap driven by broken parity symme try\; and new physics that appears due to the application of magnetic field s. This discussion will be followed by a presentation of recent theoretical developments on broken parity half-Heusler superconductors. \n\nHOST: Joh npierre Paglione LAST-MODIFIED:20150910T152726Z LOCATION:John S Toll Physics Bldg room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Daniel Agterberg\, University of Wisconsin-Milwauk ee TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131125T203000Z DTEND:20131125T213000Z DTSTAMP:20260828T094430Z UID:7lkkqruv0u45nvpve2m3bpfnqs@google.com CREATED:20131122T200444Z DESCRIPTION:Title: CPV in Higgs diphoton decays with converted photons\n\nS peaker: Dean Robinson\, Berkeley & LBNL\n LAST-MODIFIED:20131124T235640Z LOCATION:4102 Physics Buiilding SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141002T180000Z DTEND:20141002T193000Z DTSTAMP:20260828T094430Z UID:b10j7fqqrm1hbv9uv7dcgpkego@google.com CREATED:20140828T214059Z DESCRIPTION:Speaker: Dr. Vidya Madhaven\, University of Illinois\, Urbana- Champaign\n\nTitle: Symmetry Protected Dirac Fermions in Topological Crysta lline Insulators\n\nAbstract: In Dirac materials like graphene and topologi cal insulators\, electrons behave like relativistic particles with no mass. This is a direct consequence of the form of the low-energy Hamiltonian des cribing these electrons and has important implications for realizing physic al properties predicted for high-energy particles\, now in the laboratory s etting. Topoloigcal crystalline insulators are recently discovered topologi cal materials [1\,2] where topology and crystal symmetry intertwine to crea te relativistic massless electrons. Among the theoretical predictions for t opological crystalline insulators is the possibility of imparting mass to t hese massless Dirac fermions by breaking symmetry. In this talk I will disc uss our recent experimental and theoretical investigations of a topological crystalline insulator\, Pb(1-x)Sn(x)Se [3\,4]. We perform scanning tunneli ng microscopy (STM) studies at low temperatures and as a function of magnet ic field. By analyzing two types of STM data: Fourier transforms of interfe rence patterns and Landau level spectroscopy\, we reveal the coexistence of zero mass Dirac fermions protected by crystal symmetry with massive Dirac fermions resulting from crystal symmetry breaking. In addition\, I will dis cuss our recent data on the evolution of the mass as well as the Dirac surf ace state as we go through a quantum phase transition from the topological to trivial regime [5]. Finally as time permits\, I will discuss our new dat a on thin films of topological crystalline insulators where we directly mea sure the effects of strain on the topological surface states.\n\n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/c nam-condensed?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.b10j7fqqrm1hbv9uv7dcgpkego&hs=121 LAST-MODIFIED:20141001T142201Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141009T173000Z DTEND:20141009T180000Z DTSTAMP:20260828T094430Z UID:u6vdqph3pv2mgvh1fsospfliag@google.com CREATED:20140828T214308Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.u6vdqph3pv2mgvh1fsospfliag&hs=121 LAST-MODIFIED:20140828T214308Z LOCATION:phyics room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140325T150000Z DTEND:20140325T160000Z DTSTAMP:20260828T094430Z UID:2ak76bv6jse5dr55ns56dn3b4g@google.com CREATED:20140304T204812Z DESCRIPTION:Title: Dark Matter Interactions with Charged Mediators\n\nSpeak er: Jason Kumar\, Hawaii\n\nAbstract: We consider the class of models in wh ich dark matter\ninteracts with Standard Model fermions via the exchange\no f exotic charged particles. We find that\, these models\ncan exhibit a phe nomenology which is qualitatively different\nfrom that seen when the mediat ing particles are neutral.\nIn particular\, we discuss the impact on dark m atter LHC searches\,\non direct and indirect detection\, and on the correct ions to\ndipole moments of Standard Model fermions.\n LAST-MODIFIED:20140321T172948Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150520T193000Z DTEND:20150520T203000Z DTSTAMP:20260828T094430Z UID:q6k8169hqgjdf1bu4bhcj7csf4@google.com CREATED:20150514T145127Z DESCRIPTION:Speaker Name: Dr. William D. Oliver\n\nSpeaker Institution : MI T Lincoln Laboratory and the Research Laboratory of Electronics\n\nTitle: The Flux Qubit Revisited\n\nAbstract: We revisit the design and fabricatio n of the persistent-current flux qubit [1]. By adding a high-Q capacitor\, we dramatically improve its reproducibility and coherence times while retai ning 800 MHz anharmonicity in the longest lived devices [2]. We first prese nt a systematic study of 20 devices with varying capacitance and T1 values. The measured T1 times are well matched to a single model comprising charge and flux noise. We then discuss in a detail a device with 50 fF capacitanc e and T1 = 55 us. We identify quasiparticles as causing temporal variabilit y in the T1\, and we demonstrate the ability to pump these quasiparticles a way [3]. The Hahn echo time T2E = 40 us does not reach the 2T1 limit\, as i s often observed with transmons coupled to resonators. We demonstrate that this is due to dephasing caused by the shot noise of residual thermal photo ns in the readout resonator. We use noise spectroscopy techniques to measur e the lorentzian noise spectrum of the photon noise\, and we then use CPMG dynamical decoupling to recover T2CPMG ~ 2T1 in a manner consistent with th e spectrum. \n \n[1] W.D. Oliver and P.B. Welander\, MRS Bulletin\, 38\, 81 6 (2013) [2] F. Yan et al.\, in preparation (2015).\n[3] S. Gustavsson et a l.\, in preparation (2015).\n\nNotes: LPS is located at 8050 Greenmead Driv e in College Park. There is parking at LPS and overflow parking at the adja cent LTS building but not at the 4H building. LPS is on the UMCP shuttle ro ute\; take #105 for the Courtyard Apts. Please use the phone on the left ha nd side of the front door to call the receptionist for entry.\n\n LAST-MODIFIED:20150514T145127Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130926T173000Z DTEND:20130926T180000Z DTSTAMP:20260828T094430Z UID:96mt1oeqs0ngjdpquf56o3vqtg@google.com CREATED:20130916T185357Z LAST-MODIFIED:20130916T185406Z LOCATION:Phys Room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131211T160000Z DTEND:20131211T173000Z DTSTAMP:20260828T094430Z UID:udn4ibiltkrhf4h6i4voogu7o4@google.com CREATED:20131126T202033Z DESCRIPTION:Speaker: Alexey Soluyanov (ETH Zurich)\n\nTitle: Wannier functi on based approach to topological materials and beyond\n\nAbstract: Possible non-trivial topologies of materials' band structures are now ubiquitous\, and topological materials are predicted to host plenty of intriguing physic al phenomena. Thus\, the ability to identify the band structure topology (t opological quantum numbers) from microscopic modelling becomes a useful par t of materials simulations. In this talk I will focus on some particular ex amples of topologically non-trivial insulating phases\, and show how specia l kind of Wannier functions can be utilized for computing corresponding top ological quantum numbers. The surprising possibility to apply the presented numerical techniques for direct experimental measurement of topological in variants in the context of cold atoms will also be discussed.\n\nHost: Kos tyantyn Kechedzhi\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n\n LAST-MODIFIED:20131126T202033Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150617T143000Z DTEND:20150617T153000Z DTSTAMP:20260828T094430Z UID:hae3u6gulorpq98j46mjnsqojg@google.com CLASS:PUBLIC CREATED:20150610T170309Z DESCRIPTION:Speaker: Brendan M. McLaughlin\, Centre for Theoretical Atomic and Molecular Physics\, Queen’s University Belfast\n \nTitle: Quantum Chem istry and its role in dynamical studies and ultra-cold collisions.\n \nAbst ract: The structure and properties of molecules and their cations plays a f undamental role in a range of dynamical studies such as\; ultra-cold collis ions\, laser cooling and trapping\, dissociative electron attachment\, diss ociative recombination\, electron scattering\, photoionization and ultrafas t dynamics. Ultra-cold hybrid ion-atom traps offer the possibility of micro scopic manipulation of quantum coherence in the gas using the ion as a prob e. Inelastic processes\, particularly charge transfer can be a significant process of ion loss and is of current interest experimentally. The study o f ultra-cold molecules tightly trapped in an optical lattice can expand the frontier of precision measurements and spectroscopy and lead to a deeper i nsight into molecular and fundamental physics. Electron-density distributio ns and potential-energy surfaces are important for predicting the physical properties and chemical reactivity of molecular systems. Angle-resolved pho toelectron spectroscopy enables the reconstruction of molecular-orbital den sities of species. I will briefly review the methods used to obtain the st ructure and dynamics of molecular systems and show how such information can be used in various theoretical studies for a variety of molecular complexe s. I will also highlight the fundamental role played by quantum chemistry i n all of these investigations. LAST-MODIFIED:20150610T170309Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140410T190000Z DTEND:20140410T200000Z DTSTAMP:20260828T094430Z UID:26nilsk3h473v1n1raoh5sje34@google.com CREATED:20140404T192402Z DESCRIPTION:Speaker: Richard Wentworth (UMCP)\nAbstract: We give a mathemat ician's approach to supermanifolds and superfields. LAST-MODIFIED:20140404T192402Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Supermanifolds (from a mathematics point of view) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120529T180000Z DTEND:20120529T190000Z DTSTAMP:20260828T094430Z UID:3977oj6k27f39ogpbsj806v9ls@google.com CREATED:20120524T174743Z DESCRIPTION:Title: Linker Histone H1 Participates in an Extensive Network o f Protein-Protein Interactions.\n Speaker: Anna Kalashnikova\nAbsract: In e ukaryotes\, genomic DNA is packaged into a complex nucleoprotein structure called chromatin\, composed of nucleosomes. The linker histones (e.g.\, H1\ , H5) bind the nucleosome at the entry and exit sites of the DNA and are im plicated in the formation and stabilization of higher order chromatin struc tures (Lu X et al\, 2009). The linker histone H1 consists of three domains: unstructured N-terminal (NTD\, 13-40 amino acids in length) and carboxyter minal (CTD\, ∼100 amino acids) domains with a well-folded globular domain ( GD\, ∼80 amino acids) between them (Figure 1\, from McBryant and Hansen\, 2 010). CTD is essential for stabilizing higher-order structure of chromatin (Lu X and Hansen J. C.\, 2004).\nLinker histones are multifunctional\, and besides a role in chromatin condensation (Lu X et al\, 2009)\, are implicat ed in nucleosome spacing\, epigenetic regulation and specific gene expressi on (McBryant and Hansen\, 2010). Recent evidence suggests that they may fun ction in part through protein-protein interactions. To gain a better unders tanding of the scope of linker histone involvement in protein-protein inter actions\, we used a proteomics approach to identify H1 binding proteins in human nuclear extracts. We demonstrated that H1.0 is capable of binding mor e than 80 proteins\, involved in alternative splicing\, transcription\, tra nslation initiation and chromatin remodeling. Forty-three of the proteins p ulled down by H1.0 are components of the spliceosome\, including many snRNP s\, hnRNPs\, and splicing factors. Taken together\, our data argue that his tone H1 is a central component of an extensive network of protein-protein i nteractions that function in mRNA metabolism\, and suggest that a new parad igm for linker histone action is in order. LAST-MODIFIED:20120524T174755Z LOCATION:IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:complex biological phenomena based on fundamental physical and chem ical principles Group Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20150831T110000 DTEND;TZID=America/New_York:20150831T120000 RRULE:FREQ=WEEKLY;UNTIL=20151207T160000Z;BYDAY=MO EXDATE;TZID=America/New_York:20150914T110000 EXDATE;TZID=America/New_York:20150907T110000 EXDATE;TZID=America/New_York:20151012T110000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:TBA LAST-MODIFIED:20150708T144414Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150309T203000Z DTEND:20150309T213000Z DTSTAMP:20260828T094430Z UID:c6jgvb0fk560o4lq22b1kmdla4@google.com CREATED:20150225T213455Z DESCRIPTION:Speaker Name: Peter Yoon\n\nSpeaker Institution : IPST\, Univer sity of Maryland\n\nTitle : Plasma Emission by Nonlinear Electromagnetic Pr ocesses\n\nAbstract : The plasma emission is the radiation mechanism respon sible for solar type II and type III radio bursts. These radio bursts are i mportant in that they may be used in the space weather forecasting effort\, which is a research topic of contemporary importance. The detection of rad io bursts from the Sun in the meter wavelengths were first carried out in t he 1940s. Identification and classification of different types of solar rad io emissions into type I\, II\, and III\, were subsequently done in the 195 0s. Subsequently\, further classification and identification of type IV and V radio bursts were added in the 1960s. The first theory of plasma emissio n\, which was put forth to explain the type II and III radio bursts\, came in 1958 by the Soviet scientist Vitaly Ginzburg\, and further developed by others in the 1970s and 1980s\, and well into the 1990s. As a result\, the standard paradigm was established in which\, the complicated radio emission process first involves energetic electrons produced at the solar active r egion during the flare. As the energetic electrons stream outward following open magnetic field lines\, they interact with the dense background solar wind plasma. The beam-plasma interaction excites electrostatic Langmuir wav es via the well-known bump-on-tail instability\, followed by nonlinear proc esses of wave decay and scattering\, eventually leading to the backward-pro pagating Langmuir waves as well as low-frequency ion-acoustic waves. The ge neration of EM radiation is a byproduct of the nonlinear processes. Partial conversion of electrostatic wave energy\, primarily residing in the form o f Langmuir turbulence\, to transverse EM wave energy is called the plasma e mission process\, and the resultant radiation emission occurs at the plasma frequency and/or its harmonic(s). Such an elaborate process can\, in princ iple\, be demonstrated on the basis of EM weak turbulence theory\, the fund amental equations thereof and their derivation can be found in the literatu re and in the\n papers by the present author. However\, the complete numer ical solution of the entire set of EM weak turbulence equations has not bee n done until quite recently\, when the present author and his colleagues [Z iebell\, Yoon\, et al.\, 2014\, 2015] numerically solved the complete equat ions for the first time. Until then\, various approximations and simplifica tions have been made. This talk will overview the solar radio emission phen omenon and the recent theoretical development.\n\n\n LAST-MODIFIED:20150225T213455Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150220T173000Z DTEND:20150220T180000Z DTSTAMP:20260828T094430Z UID:e6qvpcgf5900eo51qt7595rn0g@google.com CLASS:PUBLIC CREATED:20150213T123925Z DESCRIPTION:Speaker Name: Jeff Grover\n\nSpeaker Institution: JQI\n \nTitl e: Some experiments with optical nanofibers\n \nAbstract: Nanophotonic de vices form a versatile platform to enhance atom-light interactions. We will present a method of making a "nanophotonic" device by paring down a normal optical fiber to sub-wavelength diameter. The high transmission of these n anofibers allows for optical trapping of atoms and potential integration wi th superconducting circuits. We will also show how time-correlated\, single -photon counting can reveal both the motion of cold atoms near the fiber an d how the proximity of the nanofiber modifies the atomic spontaneous decay rate. \n\nLunch provided just before seminar LAST-MODIFIED:20150218T202755Z LOCATION:PSC 2136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150305T180000Z DTEND:20150305T193000Z DTSTAMP:20260828T094430Z UID:dlc2ssb1hsc3ci2mctd0ko9sdo@google.com CREATED:20150227T190249Z DESCRIPTION:Speaker Name: Benjamin Carlson\n\nSpeaker Institution: Carnegie Mellon University/Fermilab\n\nTitle: "Search for Stealth Superwymmetry at the LHC"\n\nAbstract: Supersymmetry (SUSY) can simultaneously solve the hie rarchy problem\, allow unification of the fundamental interactions\, and pr ovide a candidate for dark matter. Most searches for SUSY focus on the pres ence of large missing transverse energy (MET) carried away by the lightest SUSY particle. Recent high-MET searches at the CERN LHC have not yet found evidence for SUSY. Therefore\, it is important to study well-motivated alte rnatives with low-MET\, such as models characterized by R-parity violation\ , compressed spectra\, and hidden valleys. In particular\, the "stealth SUS Y" model yields a low-MET signature while conserving R-parity by means of a new hidden sector in which SUSY is approximately conserved. I will present recent LHC searches for stealth SUSY\, and discuss interesting areas for s tudy at 13 TeV. LAST-MODIFIED:20150227T190249Z LOCATION:PSC 3204 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140424T173000Z DTEND:20140424T180000Z DTSTAMP:20260828T094430Z UID:cl7dqla4sbv8ehdh02d7rs4g8o@google.com CREATED:20140329T185208Z LAST-MODIFIED:20140329T185208Z LOCATION:Phys Room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160224T160000Z DTEND:20160224T170000Z DTSTAMP:20260828T094430Z UID:736d37o1qsebo8g7qn3h1ds6a8@google.com CREATED:20160203T174047Z DESCRIPTION:Speaker: Charles Clark\n\nSpeaker Affiliation: JQI\n\nTitle: Is Brooklyn Expanding?\n\nAbstract: Is Brooklyn expanding?\n\nAlan Turing was fascinated by the possible variation of natural laws in time. There is jus t a hint of this in his paper\, "Computing Machinery and Intelligence\," th e source of the famous phrase "the imitation game." The subject\, long at t he intersection of science and philosophy\, has recently started to become of practical interest.\n\nAnyone can read Turing's paper\, http://j.mp/1m1t at10n \, which is freely available from its publisher. I recommend that all participants in this seminar do so beforehand. LAST-MODIFIED:20160203T174047Z LOCATION:3100 Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160328T200000Z DTEND:20160328T210000Z DTSTAMP:20260828T094430Z UID:51l6vaehk0mevdkm38s1e7j548@google.com CREATED:20160321T143103Z DESCRIPTION:Speaker Name: Lois Pollack\n\nSpeaker Institution : Cornell Uni versity\n\nTitle : Pioneering new methods for exploring DNA or RNA binding partners\n\nAbstract : Because both RNA and DNA carry large negative charge s\, interaction with oppositely charged partners is required for function. Despite the important roles of these partners\, little is known about how t hey structure\, or interact with nucleic acids. I describe the development and application of new x-ray scattering based methods that highlight the ro le of partners\, ranging from ions through proteins\, in important biologic al or therapeutic processes. The first example probes the contribution of i ons in packaging RNAs for potential therapeutic applications. A second exam ple focuses on how proteins structure nucleic acids in large complexes. Her e\, we introduce a new method to follow the changing structures of nucleic acids within protein nucleic acid complexes. LAST-MODIFIED:20160321T144629Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160218T190000Z DTEND:20160218T200000Z DTSTAMP:20260828T094430Z UID:m03648s0o7hik44pcjg3t8qnqk@google.com CREATED:20151105T225021Z DESCRIPTION:Speaker Name: Mikael Rechtsman\n\nSpeaker Institution: Penn St ate University\n\nTitle: Aspects of photonic topological insulators\n\nAbs tract: I will present the observation of the topological protection of ligh t - specifically\, a photonic Floquet topological insulator. Topological in sulators(TIs) are solid-state materials that are insulators in the bulk\, b ut conduct electricity along their surfaces - and are intrinsically robust to disorder. In particular\, when a surface electron in a TI encounters a d efect\, it simply goes around it without scattering\, always exhibiting – q uite strikingly – perfect transmission. The structure is an array of couple d helical waveguides (the helicity generates a fictitious circularly-polari zed electric field that leads to the TI behavior)\, and light propagating t hrough it is ‘topologically protected’ from scattering. Topological protect ion therefore has the potential to endow photonic devices with quantum Hall -like robustness. I will also discuss exotic topological systems where opt ics provides the ideal platform for realization\, including quasicrystals a nd non-Hermitian systems.\n\nHost: Steve Anlage\n LAST-MODIFIED:20160216T214948Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Mikael Rechtsman\, Penn State TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160202T181500Z DTEND:20160202T193000Z DTSTAMP:20260828T094430Z UID:t6c9ukc5lm53fpu1oc3dnpsv4k@google.com CREATED:20160128T165713Z DESCRIPTION:Speaker Name: Professor Anatoly Kolomeisky\n\nSpeaker Instituti on: Rice University\n\nTitle: How to Understand the Formation of Signaling Molecules' Profiles in Biological Development \n\nAbstract: Concentration profiles of signaling molecules\, also known as morphogen gradients\, play a critical role in the development of multi-cellular organisms by determini ng polarity and spatial patterning that lead to further tissue differentiat ion and organ formation. Significant advances in studying morphogen gradien ts have been achieved recently when the formation of signaling molecules pr ofiles has been visualized with high temporal and spatial resolution. A wid ely used approach to explain the establishment of concentration gradients a ssumes that signaling molecules are produced locally\, then spread via a fr ee diffusion and degraded uniformly. However\, recent experiments have also produced controversial observations concerning the feasibility of this the oretical description. In addition\, it has been shown that time to establis h the morphogen gradient yield surprising linear scaling as a function of l ength\, not expected for the systems with unbiased diffusion processes. We propose here a theoretical approach based on discrete-state stochastic anal ysis that provides a possible microscopic mechanism for these complex pheno mena. It is argued that relaxation times are mostly determined by first-pas sage times and the degradation effectively accelerates diffusion of signali ng particles by removing slow moving molecules. Thus the degradation works as an effective potential that drives signaling molecules away from the sou rce. The idea of effective potential is applied for different systems. Our theoretical analysis indicates that spatial and temporal features of degrad ation efficiently control the establishment of signaling molecules profiles .\n LAST-MODIFIED:20160128T202853Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150910T180000Z DTEND:20150910T193000Z DTSTAMP:20260828T094430Z UID:hee51oas07f6q3vdic6s6o60sc@google.com CREATED:20150728T163511Z DESCRIPTION:SPEAKER: Ramesh Budhani\, Indian Institute of Technology\, Kanp ur\, India\n\nTITLE: Quantum Phases and Phase Transitions in Two-Dimension al Diffusive Metals at Oxide Interfaces\n\nABSTRACT: The two-dimensional di ffusive metal stabilized at the interface of SrTiO3 and the Mott Insulator perovskite LaTiO3 1\,2 has challenged many notions related to the formation and electronic behavior of the two dimensional electron gas at the well st udies LaAlO3-SrTiO3 interface. Here we discuss specifically the stability o f the superconducting phase3 at LaTiO3 – SrTiO3 interface\, the nature of t he superconductor – normal metal quantum phase transition (T=0 limit) drive n by magnetic field\, significance of the field vis-a-vis the Chandrasekhar - Clogston limit for depairing\, and how the transition is initiated when the extent of Coulomb interaction amongst charge carriers is modulated by e lectrostatic gating4. The nature of the superconducting condensate is highl ighted in the light of the Ti - t2g orbital driven bands and their filling in the presence of a strong Rashba spin – orbit interaction (SOI). Towards the end of the talk\, we will also discuss the prominent effects of Rashba SOI on normal state quantum transport and how it renormalizes a Kondo-like electronic behavior in range of temperature Tc < T < 5 K5\,6.\n\n1. Ad vanced Materials 22\, 4448(2010)\n2. Phys. Rev. B 86\, 075127(2012)\n3 . Nature Communications\, 1\, 89(2010)\n4. Nature Materials 12\, 542(2013)\n5. Phys. Rev. B (Rapid Communication) 90\, 081107(2014).\n6 . Phys. Rev. B 90\, 075133(2014)\n\nHOST: Chris Lobb LAST-MODIFIED:20150909T201011Z LOCATION:John S. Toll Physics Bldg\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Ramesh Budhani\, IIT Kanpur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120926T193000Z DTEND:20120926T203000Z DTSTAMP:20260828T094430Z UID:mfniaso6ftb1ne14i7h3qd5kj0@google.com CREATED:20120924T174343Z DESCRIPTION:Title: Synthetic gauge fields with linear optics and beyond\n\n Speaker: Dr. J.M. Taylor\n\nJoint Quantum Institute\nNational Institute of Standards and Technology\n\nAbstract: Photons provide a good quantum degree of freedom\, with long coherence times\, easy manipulation using linear op tical elements\, and the potential for high-efficiency detection. At the sa me time\, advances in manipulating classical light--primarily in the form o f linear optical elements built from photonics devices--suggest a unique op portunity to connect quantum science to emerging technological platforms. I will discuss recent advances towards implementation of nonlinear photonic devices for quantum information processing and quantum simulation of topol ogical phases of matter. In the first\, we consider a novel approach for ma nipulating microwave photons in high quality factor superconducting resonat ors by creating an effective nonlinear medium with Josephson devices. Using some of the same ideas\, I will then consider implementation of a quantum simulator for topological states of matter using light. These states\, suc h as those expected in the fractional Quantum Hall regime\, provide the pot ential for fault-tolerant quantum computing. LAST-MODIFIED:20120924T174354Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Park \, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151102T110000 DTEND;TZID=America/New_York:20151102T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151102T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Immanuel Bloch\n\nSpeaker Institution: Max Planc k Institute for Quantum Optics\, Ludwig-Maximilians University\, Munich\n\n Title: Non-equilibrium Dynamics of Strongly Interacting Bosonic and Fermion ic Quantum Gases\n\nAbstract: Ultracold quantum gases offer novel and intri guing possibilities to probe the dynamical evolution of strongly correlated quantum systems far from equilibrium. We report on recent experiments\, in which we have analyzed the transport behaviour of fermionic quantum gases in an optical lattices. We find three distinct transport regimes for non-in teracting\, weakly- and strongly-interacting quantum gas mixtures for both attractive and repulsive interactions. In a second series of experiments we probe the quantum dynamics of 1D ladder systems far from equilibrium. Here we investigate generalized Landau-Zener transitions between two Luttinger liquids\, for which we find striking effects of ground state phase transiti ons that manifest in the dynamical evolution of the system. Finally\, we re port on our recent experimental progress towards single atom and single sit e addressing in a 3D optical lattice using a high numerical aperture optica l microscope. LAST-MODIFIED:20151030T185451Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150501T160000Z DTEND:20150501T163000Z DTSTAMP:20260828T094430Z UID:2003kqjs21dj91li8eb2mvvv84@google.com CLASS:PUBLIC CREATED:20150424T190200Z DESCRIPTION:Speaker name: Jake Smith\n\nSpeaker institution: JQI\n\nTitle: Realization of a Quantum Integer-Spin Chain with Controllable Interactions in a Trapped Ion Quantum Simulator\n\nAbstract: Trapped-ion quantum simulat ors have proven useful in exploring quantum-many-body physics that is diffi cult to examine in condensed-matter experiments or using classical simulati on. Here\, we use spin-dependent forces to modulate the Coulomb interactio n to engineer an XY Hamiltonian with tunable\, long-range couplings between effective spin-1 particles. We observe the time evolution of the system an d verify its coherence by entangling a pair of three-level particles with 8 6% fidelity. By adiabatically ramping a global field\, we produce ground st ates of the XY model\, and we demonstrate an instance where the ground stat e cannot be created without breaking the same symmetries that protect the t opological Haldane phase. This experimental platform enables future studies of symmetry-protected order in spin-1 systems and their use in quantum app lications.\n\nImportant note: Free pizza at 11:45am on a first come first s erve basis! LAST-MODIFIED:20150427T153626Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150320T180000Z DTEND:20150320T190000Z DTSTAMP:20260828T094430Z UID:34lvt9ldcdp395eqa3ro2ef3p4@google.com CLASS:PUBLIC CREATED:20150312T141549Z DESCRIPTION:Speaker Name: Nicole Yunger Halpern\n\nSpeaker Institution: Cal tech\n\nTitle: Quantum voting and violation of Arrow’s Impossibility Theore m\n\nAbstract: We propose a quantum voting system in the spirit of quantum games such as the quantum Prisoner’s Dilemma. Our scheme violates a quantum analogue of Arrow’s Impossibility Theorem\, which states that every (class ical) constitution endowed with three innocuous-seeming properties is a dic tatorship. Superpositions\, interference\, and entanglement of votes featur e in voting tactics available to quantum voters but not to classical. (This work was conducted with Ning Bao. Reference: arXiv:1501.00458v1.) LAST-MODIFIED:20150312T142910Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120906T173000Z DTEND:20120906T180000Z DTSTAMP:20260828T094430Z UID:m7bqhh574eicg9t3bn9qmfktm0@google.com CREATED:20120904T162404Z LAST-MODIFIED:20120904T173400Z LOCATION:Room 1305F\, the "new" Toll Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140311T150000Z DTEND:20140311T163000Z DTSTAMP:20260828T094430Z UID:rs5kuo78bm5fs6127cfa0isj8s@google.com CREATED:20140114T160148Z DESCRIPTION:Speaker: Meng Cheng \n\nInstitution: Microsoft Station Q\n\nT itle: Unconventional edge phases of Abelian quantum Hall states\n\nAbstract : Integer and fractional quantum Hall states exhibit gapless edge excitatio ns which allow probing of many bulk topological properties through transpor t experiments. We find that the same bulk two-dimensional topological phase can have multiple distinct\, fully-chiral edge phases\, with experimentall y testable signatures. We show that this can occur in the integer quantum H all states at \\nu=8 and \\nu=12\, as well as in fractional quantum Hall st ates\, the simplest examples of which being \\nu=8/7\, 12/11\, 8/15\, 16/15 . We also demonstrate that fermionic systems can have chiral edge phases w ith only bosonic low-energy excitations. We explain these results using the theory of integral quadratic forms.\n\nHost: Sriram Ganeshan\n\nhttp://ww w.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140212T143155Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150506T193000Z DTEND:20150506T203000Z DTSTAMP:20260828T094430Z UID:6fr2l7aejevhogdqgf80cqrs8s@google.com CREATED:20150430T143905Z DESCRIPTION:Speaker Name: Dr. Charles Tahan\n\nSpeaker Institution: LPS\n\n Title: Bottom-up superconducting-semiconductor quantum devices\n\nAbstract: Recent improvements in materials growth and fabrication techniques may f inally allow for superconducting semiconductors to realize their potential. I will discuss our recent proposal to construct superconducting devices su ch as wires\, Josephson junctions\, and qubits inside and out-of a single c rystal\, such as silicon or germanium [1\,2]. The epitaxial and semiconduc tor nature of these devices\, along with the extreme flexibility in device design of superconducting circuits down to the single-atom scale\, may enab le lower-noise and/or fundamentally novel devices and physics. We consider applications for such super-silicon devices\, showing that the state-of-the -art transmon qubit and the sought-after phase-slip qubit can both be reali zed. The latter qubit leverages the natural high kinetic inductance of thes e materials. Building on this\, we explore how kinetic inductance based par ticle detectors (e.g.\, photon or phonon) could be realized with potential application in astronomy or nanomechanics. First-generation super-semi devi ces in silicon\, germanium\, or diamond\, which would not require atomistic fabrication approaches\, could be realized in the near-term. Finally I wil l comment on different but related experiments which are already demonstrat ing the promise of super-semi-based "traditional" qubits for quantum inform ation processing [3\,4]. \n\nNotes: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjace nt LTS building but not at the 4H building. LPS is on the UMCP shuttle rout e\; take #105 for the Courtyard Apts. Please use the phone on the left hand side of the front door to call the receptionist for entry. LAST-MODIFIED:20150430T143905Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150924T193000Z DTEND:20150924T213000Z DTSTAMP:20260828T094430Z UID:ttj8lambcj2ei77e4s9h4eg3ro@google.com CREATED:20150904T131808Z DESCRIPTION:Speaker: Albion Lawrence \n\nSpeaker Institution: Brandeis Univ ersity\n\nTitle: Entanglement and Coarse Grained Quantum Dynamics\n\nAbstra ct: Quantum entanglement has yielded a lot of insight into quantum field th eories and into gauge-gravity duality. I will review key work in this area \, and describe in particular recent work on the dynamics of entanglement b etween short- and long-wavelength modes in quantum field theories. LAST-MODIFIED:20150918T114643Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151207T200000Z DTEND:20151207T213000Z DTSTAMP:20260828T094430Z UID:vmoja0uc5369bs0emp5f3a9ogo@google.com CREATED:20151130T141219Z DESCRIPTION:Speaker: Clifford Cheung\n\nSpeaker Institution: Cal Tech\n\nTi tle: The Periodic Table of Effective Field Theories\n\nAbstract: The modern S-matrix program has seen immense progress constructing scattering amplitu des in gauge and gravity theories without the aid of a Lagrangian\, instead using only physical principles like Lorentz invariance and factorization. In this talk\, I discuss how a similar approach is sufficient to construct effective field theories (EFTs)\, yielding a ``periodic table'' of scalar EFTs labelled by two numbers. We derive these EFTs--Lagrangians\, symmetri es\, and all--from an ansatz of all possible S-matrices consistent with Lor entz invariance\, factorization\, and a certain infrared property\, obtaini ng well-known examples like the chiral Lagrangian\, Dirac-Born-Infeld theor y\, and the Galileon. We the show how tree amplitudes in these EFTs are co nstructible via on-shell recursion relations. With these methods one can p rove stringent no-go theorems on the space of EFTs and\, in principle\, eve n discover new ones.\n\nJoin with Google Hangouts: https://hangouts.google. com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.vmoja0uc5369bs0emp5f3a9ogo&hs= 121 LAST-MODIFIED:20151130T141219Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150204T210000Z DTEND:20150204T220000Z DTSTAMP:20260828T094430Z UID:8qkt0pdj0tq5l1rgcpj545lp7s@google.com CREATED:20150130T142343Z DESCRIPTION:Speaker Name: Prof. Cary Forest\n\nSpeaker Institution: Univers ity of Wisconsin\, Madison\n\nTitle: Chasing Fast Dynamos and Other Pursuit s LAST-MODIFIED:20150130T142453Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T213000Z DTEND:20140414T223000Z DTSTAMP:20260828T094430Z UID:bgt831pp06dpjr835bupt9cg90@google.com CREATED:20140409T174224Z DESCRIPTION:Speaker name: Laura Greene\n\nSpeaker Institution: University of Illinois \n\nTitle: Detecting strong electron correlations with point contact spectroscopy: \nElectron matter in Fe –pnictides\, -chalcogenides\, and heavy fermions.\n\nAbstract: Point contact spectroscopy (PCS) is a we ll-established spectroscopic tool utilizing quasiparticle scattering to det ect phonons\, magnons\, Kondo impurities\, and the superconducting order pa rameter. We have found this technique to be sensitive to a density of stat es arising from strong correlations in a variety of systems that exhibit th e ubiquitous phase diagram\, where superconductivity exits under the Tc vs. p dome. In several families of the Fe-based superconductors\, an enhanced conductance around zero bias appears at the onset of electronic nematicity \; and in the heavy fermion URu2Si2\, a hybridization gap appears as a dist inct asymmetric double-peaked structure in the conductance up to T~35 K. Th eoretical foundations for PCS as a powerful filter for strongly correlated electronic structure will be presented. \n\n\nThis work would not have bee n possible without: Wan Kyu Park\, Hamood Arham\, Cassie Hunt\, Wei-Cheng Lee\, and Philip Phillips. We also acknowledge J. Gillett\, S.D. Das\, S.E . Sebastian\, Z.J. Xu\, J. S. Wen\, Z. W. Lin\, Q. Li\, G. Gu\, A. Thaler\, S. Ran\, S.L. Bud’ko\, P.C. Canfield\, D.Y. Chung\, M.G. Kanatzidis\, P.H. Tobash\, F. Ronning\, E.D. Bauer\, J.L. Sarrao\, J. D. Thompson.\n LAST-MODIFIED:20140409T174224Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140310T150000Z DTEND:20140310T163000Z DTSTAMP:20260828T094430Z UID:ti4fq95a0adr59pdud9gd2fot4@google.com CLASS:PUBLIC CREATED:20131216T192302Z DESCRIPTION:1) Speaker: Michael Foss-Feig\nTitle:Entanglement in long-range interacting systems.\n\nAbstract: It is well known that infinite-range int eractions can facilitate the generation of massively entangled states with applications in quantum information and quantum metrology. From a theoreti cal standpoint\, such infinite-range interactions are convenient to assume because they greatly simplify the description of dynamics\, but in physical systems "infinite-range" is clearly an approximation. In this talk\, I wi ll describe what happens to a number of experimentally relevant systems whe n interactions are long-ranged but not infinite-ranged.\n\n2) Speaker: Zhex uan Gong\nTitle: Propagation of information in long range interacting quant um systems \n\nAbstract: Propagation of information in short-range interact ing systems is restricted to within a linear "light cone"\, as proven by th e well-known Lieb-Robinson bound\, thus ensuring a well defined notion of l ocality. Whether long-ranged interactions can lead to a different shape of this light cone\, and the breakdown of the associated notion of locality\, is an important but largely unexplored question. I will describe recent tra pped-ion experiments which have observed nonlocal propagation of correlatio ns in certain long-ranged interacting spin models\, and will discuss our th eoretical efforts to understand how\, as the interaction range shrinks\, lo cality is recovered.\n\n3) Speaker: Fred Jendrzejewski\nTitle: From compres sed Bose-Einstein condensates to spirals-New Experiments with superfluid at om circuits\n\nAbstract: Bose-Einstein condensates in ring geometries are e ssential ingredients to the ongoing effort at JQI of building increasingly complex superfluid circuits. Such circuits have previously allowed for the observation of persistent currents and hysteresis. Here we report on two ne w experiments that increase our abilities further. First\, we report the di rect observation of resistive flow through a weak link in a weakly interact ing atomic Bose- Einstein condensate. We use two weak links to separate our ring-shaped superfluid circuit into two distinct regions\, a source and a drain. At a critical value of the weak link velocity\, we observe a transit ion from superfluid flow to superfluid plus resistive flow. Second\, we dem onstrate a new technique to directly observe the current-phase relationship through such weak links. By interfering our ring with a phase reference (f ormed as a disc)\, we demonstrate that we can measure the phase of the BEC around the ring and the average current.\n\n LAST-MODIFIED:20140307T185222Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Postdoctoral Research Seminars TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141016T163000Z DTEND:20141016T173000Z DTSTAMP:20260828T094430Z UID:v72919i9gquluiv1g726m63avs@google.com CREATED:20140911T182205Z DESCRIPTION:Speaker Name: Wai Lim Ku\n\nSpeaker Institution : UMD\n\nTitle : Dynamical transitions in large systems of mean field coupled oscillators\ n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ph ysics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZ W5kYXIuZ29vZ2xlLmNvbQ.v72919i9gquluiv1g726m63avs&hs=121 LAST-MODIFIED:20141010T201545Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160406T180000Z DTEND:20160406T193000Z DTSTAMP:20260828T094430Z UID:iuu0g8raffuebh1be3kdg977kg@google.com CREATED:20160329T182945Z DESCRIPTION:Speaker: Neill Warrington\n\nSpeaker Institution: University o f Maryland\n\nTitle: Thimbles: A Geometric Solution to the Sign Problem?\n\ nAbstract: Physical models afflicted with a sign problem on the lattice are \, in general\, difficult to analyze via standard Monte Carlo techniques. T his is because the standard probability distribution exp(-S)/Z is no longer positive definite and the phase of the integrand oscillates wildly. These difficulties are circumvented by re-formulating the theory on curved manifo lds called "Lefschetz Thimbles".\n\nIn this talk\, I present a novel algori thm for performing Monte Carlo simulations on thimbles. Additionally\, I wi ll describe an extension of this algorithm that integrates over multiple th imbles simultaneously\, a necessary development in order to tackle more com plicated models. Results of its application to a U(1) model with a chemical potential will be discussed. LAST-MODIFIED:20160329T183747Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140919T170000Z DTEND:20140919T180000Z DTSTAMP:20260828T094430Z UID:q0lj129rh6cbilc8sj169adf8o@google.com CREATED:20140915T142722Z DESCRIPTION:Speaker Name: Christopher Schuh\n\nSpeaker Institution : MIT\n\ nTitle : Harder\, Cheaper\, Greener: the Design and Deployment of Alloy Coa tings with Stabilized Nanocrystalline Structures\n\nAbstract : When the gra in size of a metal is refined to a scale on the order of just a few nanomet ers\, its strength\, hardness\, wear resistance\, and other properties impr ove in dramatic ways. There is therefore significant interest in designing and deploying such nanocrystalline alloys for structural applications. Ho wever\, refining the grain structure is a struggle against equilibrium\, an d nanocrystalline materials are often quite unstable\; the grains grow give n time even at room temperature\, and the associated property benefits decl ine over time in service. In this talk\, our efforts to design a stable fa mily of nanocrystalline alloys will be described. We rely on selective all oying as a method to lower the energy of grain boundaries\, bringing the na nocrystalline structure closer to equilibrium. Using analytical thermodyna mic mixing calculations and Monte Carlo simulations\, we identify desirable alloying elements for a given base metal\, and assess the relative stabili ty of nanocrystalline structures against grain growth. We then transition t hese modeling principles to the laboratory\, produce materials\, and experi mentally validate the modeling results. Finally\, the talk will review the connection between theory\, experiment\, and engineering application\, and describe a suite of commercial products based on this research.\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.ed u/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.q0lj129rh6cbilc8sj169adf8o&hs=121 LAST-MODIFIED:20140915T143213Z LOCATION:2108 Chemical and Nuclear Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar. TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140210T213000Z DTEND:20140210T223000Z DTSTAMP:20260828T094430Z UID:btpolhqb38qg0o273lsic10ql4@google.com CREATED:20140203T160406Z DESCRIPTION:Speaker Name: Xiangdong Ji\n\nSpeaker Institution : University of Maryland\, Department of Physics\n\nTitle : TBA\n\nNotes: Tea and Cookie s 4:15-4:30 pm\n LAST-MODIFIED:20140203T160406Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150512T171500Z DTEND:20150512T183000Z DTSTAMP:20260828T094430Z UID:edevqjc4oq6k9vqh20o93g00qg@google.com CREATED:20150428T140623Z DESCRIPTION:Speaker Name: Professor Raman Sundrum\n\nSpeaker Institution : UMCP\n\nTitle : Hot Field Theory as the Black Hole Interior.\n\nAbstract : I begin by reviewing the AdS/CFT duality relating hot conformal field theor ies and black holes in anti de Sitter spacetimes. In (idealized) applicatio ns the focus is often on the black hole exterior as a model of condensed ma tter systems at strong coupling. However\, I will discuss how subtler non-l ocal observables in hot field theories are dual to processes taking place i nside the black hole horizon.\n LAST-MODIFIED:20150428T140822Z LOCATION:Room 1116 IPST Buidling\, Bldg. 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150216T200000Z DTEND:20150216T213000Z DTSTAMP:20260828T094430Z UID:sr93rrbaakqaeuasftgds5helg@google.com CREATED:20150210T143947Z DESCRIPTION:Speaker Name: Kfir Blum\n\nSpeaker Institution: IAS\n\nTitle: V acuum stability bounds on Higgs couplings in the absence of new physics bos ons\n\nAbstract: We analyze the constraints imposed by Higgs vacuum stabili ty on models with new fermions beyond the Standard Model. We focus on the p henomenology of Higgs couplings accessible at the Large Hadron Collider. Ne w fermions that affect Higgs couplings lead to vacuum instability of the Hi ggs potential. Above the scale of vacuum instability\, bosonic states must stabilize the potential\, implying a cut-off to the pure fermion model. Con servatively tuning the models to produce the maximal cut-off for a given Hi ggs coupling effect\, we show that observing a deviation in the H t t \, H -diphoton\, or H -digluon coupling\, larger than 20%\, would require that n ew bosons exist in order to stabilize the Higgs potential below about 100 T eV. For generic parameter configurations\, and unless the new fermions are made as light as they can possibly be given current experimental constraint s\, observing a 10% deviation in any of these couplings would suggest an in stability cut-off below 10-100 TeV. Similarly\, if new bosons are absent up to a high scale\, then a deviation in the Hbb or Hττ coupling\, larger tha n about 20%\, should be accompanied by a sizable deviation in the Z b b or Z ττ couplings that can be conclusively tested with electroweak precision m easurements at planned lepton colliders.\n\nJoin with Google Hangouts: http s://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNj YwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.sr93rrbaak qaeuasftgds5helg&hs=121 LAST-MODIFIED:20150216T181339Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar **Please note new time** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T200000Z DTEND:20140414T210000Z DTSTAMP:20260828T094430Z UID:a4p9m9fhqhm9p20v7mksefcuug@google.com CREATED:20140325T182239Z DESCRIPTION:Speaker Name: Walter Englander\n\nSpeaker Institution : Univers ity of Pennsylvania\n\nTitle: Hydrogen exchange by Mass Spectrometry Prote in Biophysics\, Function\, and Folding\n\nAbstract: Unlike any other labor atory method\, hydrogen exchange (HX) behavior encodes detailed quantitativ e information\, at amino acid resolution\, on the biophysical factors that produce protein function -- structure\, structure change\, interactions\, d ynamics\, and energetics. The talk will describe a newly advanced method th at extends the HX capability to large and previously unreachable protein sy stems. Recent results finally answer the question of how proteins fold\, an d why they fold in that way. LAST-MODIFIED:20140325T182239Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T193000Z DTEND:20150415T203000Z DTSTAMP:20260828T094430Z UID:qtr85nh151mh5gql976dcbdvog@google.com CREATED:20150409T161452Z DESCRIPTION:Speaker Name: Dr. Alan Edelstein\n\nSpeaker Institution : US Ar my Research Lab\n\nTitle: Information Storage and ARL Magnetic Phase Change Memory\n\nAbstract : There is an increasing gap between the information we produce and the amount we can store. Causes for this gap include the dens ity limit imposed by superparamagnetism and the lifetime of storage media. New technologies such as heat assisted magnetic recording (HAMR)\, racetra ck memory and Spin Transfer Torque RAM are aimed at mitigating the problem. ARL is investigating a new approach called Magnetic Phase Change Memory ( MagPCM). Presently\, magnetic information is stored using remanent magneti zation. Instead\, in MagPCM\, magnetic information is stored in bits with different magnetic permeability. Since the permeability is an intrinsic pr operty\, the information is not erased by inadvertent exposure to a magneti c field or temperature changes. The information is written thermally by de creasing the permeability of either Metglas or layers of permalloy and copp er with a laser or by ohmic heating. Heating causes the Metglas to crystal lize and causes the copper to diffuse into the permalloy. For Metglas\, by controlling the heating one can either increase or decrease the permeabili ty. Thus\, we have demonstrated three memory states. The bits are read by measuring how they modify a probe field. The permeability of layers of pe rmalloy and copper is unaffected by exposure to 10 megarad of gamma radiati on from 60Co. Possible applications of MagPCM are more secure identificati on cards and high density\, non-erasable memory that should last decades. The path forward for achieving this last application using a variation of h eat assisted magnetic recording will be discussed.\n\nNotes: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overf low parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use t he phone on the left hand side of the front door to call the receptionist f or entry. LAST-MODIFIED:20150409T162157Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150423T163000Z DTEND:20150423T173000Z DTSTAMP:20260828T094430Z UID:8u8iu9k98049ngvm276r76rues@google.com CREATED:20150414T185154Z DESCRIPTION:Speaker Name: Louis Pecora\n\nSpeaker Institution : NRL\n\nTitl e: Using Group Theory to Find All Possible Synchronization Patterns in a N etwork of Oscillators LAST-MODIFIED:20150414T185322Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160201T180000Z DTEND:20160201T190000Z DTSTAMP:20260828T094430Z UID:7u1ak7mf8asulc3tepevqs4bto@google.com CREATED:20151130T191627Z DESCRIPTION:Speaker Name: Pedro Costa\n\nSpeaker Affiliation: CBPF\n\nTitle : Simulating quantum Systems with cellular automata\n\nAbstract: Cellular a utomata-(CA) are computational structures spaciously and temporally discret e which were originally proposed by John von Neumann in the late 1940’s. Th ey have the same computational power of Turing machines.This tool enables u s to simulate a large number of different problems in distinct areas.\n\nA fter the discussion proposed by Richard Feynman about the efficiency of cla ssical computers at simulating quantum systems\, different quantum computat ional formalisms were proposed such as quantum circuits and quantum cellula r automaton-(QCA)\, with the purpose of simulating quantum systems.\n\nIn t his seminar we will show different CA formalisms and see examples of its ap plications. In particular we will show how the random walk\n(RW) problem ca n be simulated by a CA. Its continuous limit can be achieved through the Ch apman-Enskog expansion.\n\nFinally we will show\, in analogous way\, how th e quantum walk (QW) is modelled by QCA and obtain its continouous limit\n LAST-MODIFIED:20160128T201801Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150608T134000Z DTEND:20150608T144000Z DTSTAMP:20260828T094430Z UID:a1sba5k9a7fkhsfellmaho8s8g@google.com CREATED:20150514T195454Z DESCRIPTION:Speaker Name: Mohammad Ali Rajabpour \n\nSpeaker Institution: F luminense Federal University\, Brazil\n\nTitle: Dynamics after quantum quen ch in long-range field theories\n\nAbstract: In this talk I will first intr oduce classical and quantum long-range Ising models and their field theory counterparts. I will show that in particular regimes these systems can be d escribed with simple free non-local field theories with dispersion relation $\\omega(k)=|k|^{\\alpha/2}$. Having this motivation in mind I will first study many quantum aspects of free non-local field theories such as: the en tanglement entropy\, dynamics of local operators and entanglement entropy a fter quantum quenches. Then in particular cases I will also present some r esults regarding interacting field theories.\n\n1: M. A. Rajabpour\, S. So tiriadis\, Phys. Rev. B 91\, 045131 (2015)\n2: M. Ghasemi Nezhadhaghighi\, M. A. Rajabpour\, EPL\, 100 (2012) 60011 and Phys. Rev. B 88\, 045426 (201 3) and Phys. Rev. B 90\, 205438 (2014) LAST-MODIFIED:20150608T091130Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special JQI/QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141029T193000Z DTEND:20141029T203000Z DTSTAMP:20260828T094430Z UID:1ro8jge3g5dfm15nlho57pmdco@google.com CREATED:20141023T132257Z DESCRIPTION:Speaker Name: Dr. Michael Dreyer\n\nSpeaker Institution : Lab f or Physical Sciences (UMCP)\n\nTitle: Josephson Scanning Tunneling Microsc opy at mK Temperatures\n\nAbstract: Scanning tunneling microscopy allows th e observation of the local density of electron states at the atomic scale. Operating at mK temperatures not only enhances the energy resolution\, but also allows studying low temperature phenomena such as superconductivity. U sing a superconducting tip along with a superconducting sample the STM junc tion behaves like an ultra-small Josephson junction. Such a setup is referr ed to as Josephson STM. Due to the small Josephson energy compared to the t hermal energy the supercurrent branch of an I(V) curve is suppressed and on ly a phase diffuse zero bias conduction peak remains.\nWe observed the zero bias conduction peak in our STM setup using niobium tips and a niobium (10 0) single crystal as the sample. Tunneling spectra show additional structur es due to multiple Andreev reflection. Near the ZBCP electronic coupling to the environment leads to several dips in the conduction signal. Upon micro wave (µW) irradiation the peaks split due to the absorption or emission of µW photons which is well explained by theory and shows that the tunneling c harge carriers are indeed cooper pairs. Furthermore\, current oscillations were observed at energies of negative differential conductance showing char acteristics of relaxation oscillation. In the talk I will describe our setu p and discuss the observed effects. Furthermore\, I will describe our plans on how to overcome the phase diffusion and locally measure the superconduc tive \n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/ _/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY 2FsZW5kYXIuZ29vZ2xlLmNvbQ.1ro8jge3g5dfm15nlho57pmdco&hs=121 LAST-MODIFIED:20141024T174631Z LOCATION:Lab for Physical Sciences downstairs conference room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131209T190000Z DTEND:20131209T203000Z DTSTAMP:20260828T094430Z UID:7bgted98hbmjpeenl431c67shs@google.com CREATED:20131209T035745Z DESCRIPTION:Speaker: Matthew P.A. Fisher (Physics Department and KITP\, UC SB)\n\nTitle: Quantum Disentangled Liquids\n\nAbstract: We propose and exp lore a new finite temperature phase of translationally invariant multicompo nent liquids which we call a “Quantum Disentangled Liquid” (QDL) phase. We contemplate the possibility that in fluids consisting of two (or more) spec ies of indistinguishable quantum particles with a large mass ratio\, the li ght particles might “localize” on the heavy particles. We give a precise\, formal definition of this Quantum Disentangled Liquid phase in terms of the finite energy density many-particle wavefunctions\, involving partial meas urements. If the positions of all the heavy particles are measured\, the pr ojected wavefunction for the unmeasured light particles has as an area law entanglement entropy\, while measuring the light particle positions project s onto a heavy particle wavefunction with a volume law entanglement entropy . A heavy/light particle QDL phase can be generalized to include other part ial measurements\, such as measuring the spin or the charge in a Fermion Hu bbard-type model. In a spin/charge QDL phase\, measuring the spin in a fini te energy density eigenstate would project on to a charge wavefunction with an area law entanglement entropy\, while a charge measurement would projec t on to a volume law entangled spin wavefunction. Possible physical systems that might manifest a QDL phase will be briefly discussed.\n\nHost: Kosty antyn Kechedzhi\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20131209T035856Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**RESCHEDULED to Tuesday** CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151103T190000Z DTEND:20151103T203000Z DTSTAMP:20260828T094430Z UID:q2vm8chsn2rls0qrbu57koppf8@google.com CREATED:20151030T131038Z DESCRIPTION:Speaker: Prashant Saraswat \n\nSpeaker Institution: UMD and Joh ns Hopkins\n\nTitle: Informal Review of Inflationary Cosmology\n\nAbstract: I will give an overview of cosmic inflation\, including the cosmological m otivations\, the ingredients required to realize slow-roll inflation\, the generation of scalar and tensor fluctuations\, and discussion of specific m odels and the associated theoretical issues. The goal of the review will be to describe what current and future observations can tell us about inflati on and the associated high-energy physics. Discussion and questions are enc ouraged. LAST-MODIFIED:20151030T131038Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160302T200000Z DTEND:20160302T210000Z DTSTAMP:20260828T094430Z UID:0oi32c08vuit70u5d4q1bu705g@google.com CREATED:20160226T144915Z DESCRIPTION:Speaker Name: Prof. Xiaodong Xu\n\nSpeaker Institution: Unive rsity of Washington\n\nTitle: Spin and pseudospins in 2D semiconductors an d heterostructures\nAbstract: Electronic valleys are extrema of Bloch ener gy bands in momentum space. Having multiple valleys gives the electron stat es pseudospin degrees of freedom in addition to their real spin. In this ta lk\, I will discuss our experimental progress on the investigation of spins and pseudospins using atomically thin semiconductors\, which are either si ngle or bilayer group VIB transition metal dichalcogenides. I will first sh ow that these new 2D semiconductors behave as remarkable excitonic systems\ , providing an ideal laboratory for optical manipulation and electrical con trol of valley degrees of freedom. I will then discuss strong phonon-excito n interactions in 2D limit\, which manifests as excitonic anti-stokes enhan ced by doubly resonant Raman scattering with valley selectivity and electri cal control. I will conclude the talk with the discussion of interlayer exc iton properties in monolayer semiconducting heterostructures\, which is ana logous to spatially indirect excitons in double quantum wells\, but with ad ditional valley pseudospin properties. \n\nBiosketch: Xiaodong Xu is an As sociate Professor in the Department of Physics and the Department of Materi als Science and Engineering at the University of Washington. He received hi s PhD (Physics\, 2008) from the University of Michigan and then performed p ostdoctoral research (2009-2010) at the Center for Nanoscale Systems at Cor nell University. His nanoscale optoelectronics group at University of Washi ngton focuses on creation\, control\, and understanding of novel optoelectr onic devices based on two-dimensional quantum materials. Selected awards in clude DAPRA YFA\, NSF Early Career Award\, DoE Early Career Award\, Cottrel l Scholar Award\, and IUPAP Young Scientist Prize in Semiconductor Physics. LAST-MODIFIED:20160226T183049Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150513T163000Z DTEND:20150513T190000Z DTSTAMP:20260828T094430Z UID:08oc1p06eltatgpcrouv7ff3l0@google.com CREATED:20150330T131001Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12.30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: SUSY Naturalness and the Higgsino\n\nSpeaker: Markus Luty\, U C\, Davis\n\nAbstract: I will discuss the status of SUSY naturalness after LHC8\,\nemphasizing the role of the Higgsino in naturalness constraints. I\ nthen show that if the SUSY Higgs is a pseudo Nambu-Goldstone boson\,\nthe Higgsino mass can be at the TeV scale without excessive\nfine-tuning. In su ch models\, SUSY models with heavier LSPs can be\nnatural. The conclusion i s that compressed spectra may be the last\nstand of natural SUSY models. LAST-MODIFIED:20150508T191548Z LOCATION:Bloomberg Hall\, Johns Hopkins University SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT Seminar w/ Johns Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151113T170000Z DTEND:20151113T180000Z DTSTAMP:20260828T094430Z UID:jbah2n4sm433hhibgrno8426og@google.com CLASS:PUBLIC CREATED:20151106T143704Z DESCRIPTION:\nSpeaker Name: Setiawan\n \nSpeaker Institution: CMTC\n\n(Free lunch served at 11:45)\n\nTitle: Dynamical Detection of Topological Phase Transitions in Short-Lived Atomic Systems\n\nAbstract: A generic obstructio n to the observations of recently proposed family of topological phases in cold atomic systems is heating due to spontaneous emission from applied las er fields. In this talk\, I will demonstrate that dynamical probes provide direct means of detecting the topological phase transition (TPT) between co nventional and topological phases\, which would otherwise be difficult to a ccess because of loss or heating processes. We propose to avoid such heatin g by rapidly quenching in and out of the short-lived topological phase acr oss the transition that supports gapless excitations. Following the quench\ , the distribution of excitations in the final conventional phase carries s ignatures of the TPT. I will apply this strategy to study the TPT into a Ma jorana-carrying topological phase predicted in one-dimensional spin-orbit-c oupled Fermi gases with attractive interactions. The resulting spin-resolve d momentum distribution\, computed by self-consistently solving the time-de pendent Bogoliubov--de Gennes equations\, exhibits Kibble-Zurek scaling and Stuckelberg oscillations characteristic of the TPT. Finally\, I will discu ss parameter regimes where the TPT is experimentally accessible. LAST-MODIFIED:20151106T143705Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150223T210000Z DTEND:20150223T220000Z DTSTAMP:20260828T094430Z UID:kqcoej1m7j87n8mbpl2l2b3pro@google.com CREATED:20150211T190429Z DESCRIPTION:Speaker Name: Vladimir Ptuskin\n\nSpeaker Institution: IZMIRAN\ n\nTitle: Type IIn Supernovae as Sources of High Energy Neutrinos\n\nAbstra ct: The diffusive shock acceleration in supernova remnants is discussed. Th e supernova remnants are the main sources of cosmic rays in the Galaxy. It is quite possible that Type Ia SNRs accelerate particles up to energies 3 1 015 Z eV and produce the “knee” in the observed cosmic ray spectrum (Z is t he particle charge). The maximum particle energy is higher for supernova ex plosion in dense wind of a progenitor star. The calculated flux of neutrino s produced by accelerated protons in winds of SN IIn progenitors in the Uni verse can explain the flux of very high energy astrophysical neutrinos obse rved in the IceCube experiment.\n\n\n LAST-MODIFIED:20150219T154734Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140313T173000Z DTEND:20140313T180000Z DTSTAMP:20260828T094430Z UID:qmlg3ljd994gb58ssu8eqn5tls@google.com CREATED:20140205T023202Z LAST-MODIFIED:20140205T023246Z LOCATION:Phys room 1305F\; the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140516T173000Z DTEND:20140516T183000Z DTSTAMP:20260828T094430Z UID:2o5b32fvbl2i1t8iuj550g1gq4@google.com CREATED:20140508T141544Z DESCRIPTION:Speaker Name: Keith Moffatt\n\nSpeaker Institution : University of Cambridge\, UK\n\nTitle : Soap film dynamics and topological jumps unde r continuous deformation\n\nAbstract : Consider the dynamics of a soap-film bounded by a flexible wire (or wires) which can be continuously and slowly deformed. At each instant the soap-film is relaxed in quasi-static manner to a minimum-area (i.e. minimum-energy) state compatible with the boundary configuration. This can however pass through a critical configuration at wh ich a topological jump is inevitable. We have studied an interesting exampl e of this behaviour: the jump of a one-sided (Möbius strip) soap-film to a two-sided film as the boundary is unfolded and untwisted from the double co ver of a circle. The nature of this jump will be demonstrated and explained .\n\nMore generally\, dynamical systems have a natural tendency to relax th rough dissipative processes to a minimum-energy state\, subject to any rele vant constraints. An example is provided by the relaxation of a magnetic fi eld in a perfectly conducting but viscous fluid\, subject to the constraint that the magnetic field lines are frozen in the fluid. One may infer the e xistence of magnetostatic equilibria (and analogous steady Euler flows) of arbitrary field-line topology. In general\, discontinuities (current sheets ) appear during this relaxation process\, and this is where reconnection of field-lines (with associated change of topology) can occur. Just as for th e soap film\, slow change of boundary conditions can lead to critical condi tions in which such topological jumps are inevitable.\n LAST-MODIFIED:20140508T141544Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminars TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151203T190000Z DTEND:20151203T200000Z DTSTAMP:20260828T094430Z UID:792o3svjuik6tbvt44c6g3goco@google.com CREATED:20151105T225353Z DESCRIPTION:SPEAKER: Kevin Osborn\, UMD\n\nTITLE: The Tunneling Atom Laser : Manipulating lossy two-level defects to produce coherent microwave gain i n a resonator\n\nABSTRACT: Superconducting qubits have coherence limitatio ns set by two-level system (TLS) defects which absorb microwave energy. The se TLSs are known to arise in dielectric films such as native oxides\, at m aterial interfaces\, etc. As a result\, TLSs contribute to damping in qubit s and related parametric amplifiers\, where a Josephson junction is used fo r the nonlinearity. Here I will show a new method to adiabatically invert ( excite) these same TLSs using a resonator which has no other significant no nlinearity. Pump fields are applied at detuned frequencies from the resonat or\, and with an additional sweeping dc field\, the TLS population is gener ally inverted. When TLSs are inverted we find that they produce gain nonlin earity rather than a damping contribution. This occurs despite TLS randomne ss in multiple standard model parameters. We show that the threshold for la sing can be explained in terms of a cavity quantum electrodynamics model. F urthermore\, with this control\, the resonator is found to pass from the re gime of ordinary defect loss\, through a state of negligible material dissi pation (and infinite quality factor)\, and finally to a regime of coherent microwave gain. LAST-MODIFIED:20151127T230402Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Kevin Osborn\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151211T170000Z DTEND:20151211T180000Z DTSTAMP:20260828T094430Z UID:rlfiv7l4oq7k88f2v5vo8cjqps@google.com CREATED:20151210T212434Z DESCRIPTION:Speaker Name: Hsin-I Lu\, JQI\n\nPSC 2136\n\n(Free lunch serve d at 11:45)\n\nTitle: Geometrical pumping with a Bose-Einstein condensate\n \nAbstract: We realized a quantum "charge" pump for a Bose-Einstein condens ate (BEC) in a 1D bipartite magnetic lattice\, whose bands are characterize d by non-trivial topological invariants: the Zak phases.\nFor each band\, t he Zak phase is determined by that band's aggregate Berry curvature\, a geo metric quantity defined at each crystal momentum. We probed this Berry curv ature in an adiabatic charge pump experiment\, by periodically driving the system. Our BEC occupied just a single crystal momentum state\, allowing us to access its band's local geometry. For each pump cycle we observed an ov erall displacement (not quantized) and a temporal modulation of the atomic wavepacket's position in each unit cell\, i.e.\, the polarization. Our magn etic lattice enabled us to observe this modulation by measuring the BEC's m agnetization. The non-quantized displacement of the BEC is solely determine d by the underlying Berry curvature\, differing from that of the lattice mo tion in our periodic drive. LAST-MODIFIED:20151210T212446Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141219T170000Z DTEND:20141219T173000Z DTSTAMP:20260828T094430Z UID:m33vmq4nsnltgqg0hf0krkte5g@google.com CREATED:20141215T202254Z DESCRIPTION:Speaker: Xiaopeng Li\, JQI\n\nTitle: "Topological loop current s and experimental signatures in optical lattices"\n\nImportant note: Free lunch served right before the seminar\n\nAbstract: Spontaneous loop current order breaks time-reversal symmetry and gives rise to chiral states. It is recently found to play an important role in strongly correlated materials such as cuprates. However\, direct probe of loop currents in such materials remains a challenge. In this talk\, I will discuss loop currents in optic al lattices. For Bose-Einstein condensates\, such ordering in certain cases can be extracted from condensate wavefunction\, which is known from time-o f-flight measurements. Experimental evidences observed in chequerboard and hexagonal lattices will be discussed. Loop currents of fermions naturally p rovide emergent gauge fields\, supporting topological states such as Quantu m Hall and Weyl semimetals. Experimental signatures in fermion systems also exist in time-of-flight\, yet in a different way from Bosons. \n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/k hickma1?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.m33vmq4nsnltgqg0hf0krkte5g&hs=121 LAST-MODIFIED:20141215T202431Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151030T170000Z DTEND:20151030T180000Z DTSTAMP:20260828T094430Z UID:lclp8kmks6ocqcde1sg9bf5ndg@google.com CLASS:PUBLIC CREATED:20151022T181421Z DESCRIPTION:Speaker Name: David Clarke\; CMTC\n \n(Free lunch served at 11: 45)\n\nTitle: A practical phase gate for producing Bell violations in Major ana wires\n\nABSTRACT: The Gottesman-Knill theorem holds that operations fr om the Clifford group\,\nwhen combined with preparation and detection of qu bit states in the\ncomputational basis\, are insufficient for universal qua ntum computation.\nIndeed\, any measurement results in such a system could be reproduced within a\nlocal hidden variable theory\, so that there is no need for a quantum mechanical\nexplanation and therefore no possibility of quantum speedup. Unfortunately\,\nClifford operations are precisely the one s available through braiding and\nmeasurement in systems supporting non-Abe lian Majorana zero modes\, which are\notherwise an excellent candidate for topologically protected quantum\ncomputation. In order to move beyond the c lassically simulable subspace\, an\nadditional phase gate is required. This phase gate allows the system to violate\nthe Bell-like CHSH inequality tha t would constrain a local hidden variable\ntheory. In this talk\, I will de monstrate the procedure for measuring Bell\nviolations in Majorana systems and introduce a new type of phase gate for the\nalready existing semiconduc tor-based Majorana wire systems. I will conclude with an\nexperimentally fe asible schematic combining the two\, which should potentially\nlead to the demonstration of Bell violations in a Majorana experiment in the\nnear futu re. \n LAST-MODIFIED:20151026T114559Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151015T140000Z DTEND:20151015T170000Z DTSTAMP:20260828T094430Z UID:4p3hppf0pbh2nis1gu73lo7c8k@google.com CREATED:20150921T194351Z DESCRIPTION:Theme: Exotic Quantum Phases\n\n10:00 AM Yang-Le Wu "Z4 para fermions in fractional quantum Hall bilayers"\n\n10:45 AM Xiao Li "Quantu m Hall effects in certain topological states of matter"\n\n11:30 AM Pallab Goswami "HP1 gauge theory of deconfined quantum criticality in (2+1) dime nsions"\n\n12:15 PM Andrew Allocca "Quantum interference phenomena in the Casimir effect"\n LAST-MODIFIED:20150921T194351Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20140313T150000 DTEND;TZID=America/New_York:20140313T160000 DTSTAMP:20260828T094430Z UID:a94qpqt0limpc3kfvlhmvas938@google.com RECURRENCE-ID;TZID=America/New_York:20140313T150000 CREATED:20140311T172130Z DESCRIPTION:Speaker: Sungwoo Hong (UMCP)\n\nTitle: Introduction to supersy mmetry\n\nFor more information on RIT\, please visit http://www-math.umd.ed u/research/seminars/rit-on-geometry-and-phsyics.html LAST-MODIFIED:20140311T182400Z LOCATION:Physics 4208 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:RIT on Geometry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150126T160000Z DTEND:20150126T170000Z DTSTAMP:20260828T094430Z UID:dfl1j3k1br6dl873i054eo3jso@google.com CLASS:PUBLIC CREATED:20150123T162441Z DESCRIPTION:Speaker: Randy Hulet\, Rice University\n\nTitle: Antiferromagne tism with Ultracold Atoms\n\nAbstract: Ultracold atoms on optical lattices form a versatile platform for studying many-body physics\, with the potenti al of addressing some of the most important issues in strongly correlated m atter. Progress\, however\, has been stymied by an inability to create suff iciently low temperatures in an optical lattice. In this talk\, I will pres ent our experimental results on the characterization of the three-dimension al Hubbard model near half-filling\, realized using two spin-states of ferm ionic atomic lithium (6Li). We have developed a compensated optical lattice that has enabled\, for the first time\, the achievement of temperatures th at are below the tunneling energy in the lattice\, t. For strong interactio ns\, we observe the emergence of a density plateau and a reduction of the c ompressibility\, indicative of the formation of a Mott insulator. The Hubba rd model is known to exhibit antiferromagnetism at temperatures below the N éel temperature TN. We have detected antiferromagnetic correlations by spin -sensitive Bragg scattering of light. LAST-MODIFIED:20150123T162441Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140505T190000Z DTEND:20140505T200000Z DTSTAMP:20260828T094430Z UID:4edkmjhri9uq2ci7hthndtm0n0@google.com CREATED:20140430T153017Z DESCRIPTION:This event has been cancelled. It will not be rescheduled for t his semester. \n\nSpeaker Name: Gilly Elor\n\nSpeaker Institution: MIT\n\nT itle: Bubble Baryogenesis\n\nAbstract: I will discuss an new mechanism of b aryogenesis in which a scalar baryon undergoes a percolating first-order ph ase transition in the early Universe. The potential barrier that divides th e phases contains explicit B and CP violation and the corresponding instant on that mediates decay is therefore asymmetric. The nucleation and growth o f the asymmetric bubbles dynamically generates baryons\, which thermalize a fter percolation\; bubble collision dynamics can also add to the asymmetry yield. I will give an example in the context of an explicit toy model that undergoes bubble baryogenesis and detail the numerical study of the evoluti on of the baryon asymmetry through bubble nucleation and growth\, bubble co llisions\, and washout. I will briefly discuss more realistic constructions . LAST-MODIFIED:20140502T132723Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar **Cancelled** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151022T163000Z DTEND:20151022T173000Z DTSTAMP:20260828T094430Z UID:un7qtnj5ppl5j4g40sfmutiicc@google.com CREATED:20151001T185014Z DESCRIPTION:Title: Levitation of dust grains near the Moon and asteroids\nE lectrostatic levitation of dust grains near the moon and asteroids \nProf. Christine Hartzell\nUniversity of Maryland\, Department of Aerospace Engine ering LAST-MODIFIED:20151014T125514Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141023T193000Z DTEND:20141023T203000Z DTSTAMP:20260828T094430Z UID:shbjliaftj0hra8kg7vpto5pmk@google.com CREATED:20141020T145928Z DESCRIPTION:Speaker: Paul Green (UMd)\nAbstract: We review the famous paper of Chevalley and Eilenberg on Lie algebra cohomology in Trans. Amer. Math. Soc. 63 (1948)\, http://www.ams.org/journals/tran/1948-063-01/S0002-9947-1 948-0024908-8/S0002-9947-1948-0024908-8.pdf\nwith a view toward understandi ng supersymmetric generalizations.\n\nJoin with Google Hangouts: https://ha ngouts.google.com/hangouts/_/physics.umd.edu/de-rham-and?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.shbjliaftj0hra8k g7vpto5pmk&hs=121 LAST-MODIFIED:20141020T145928Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:De Rham and Chevalley-Eilenberg cohomology\, part 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160318T170000Z DTEND:20160318T180000Z DTSTAMP:20260828T094430Z UID:0kpb2moeheugn0gh8h8sbqn6go@google.com CREATED:20160308T185139Z DESCRIPTION:Speaker: Dr. Ling Miao\, Managing Editor\, Physical Review X (P RX)\n\nTitle: Physical Review X: In the best tradition of the Physical Revi ew journals\n\nAbstract: PRX\, launched in May\, 2011\, is still a new mem ber of the Physical Review family journals (including PRL\, PRA\, PRB\, PRC \, PRD\, and PRE) -- the bedrock journals that the international physics co mmunity relies on. What are PRX's current status and position? What are its long-term mission and goals? What can it offer you? \nI will answer these questions in this talk. In connection I will briefly discuss the status of the Physical Review family journals and their indisputable contribution to physics and to the international physics community. I will provide some rep resentative statistics on publications\, citations and impact measures as w ell as some geographic and institutional comparisons. \nI will also give yo u an insider's view of the PRX's editorial process: On what basis do the ed itors evaluate new papers\, choose referees\, and accept and reject papers? What are the fundamental challenges the editors face in publishing a highl y selective journal? How can authors navigate the review process productive ly? How can referees help? \nLast but not least\, I want to get your view o f the Physical Review journals and your feedback on our editorial work. Suc h input will help PRX and its sister journals become stronger and work bett er for you.\n LAST-MODIFIED:20160308T185254Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140922T150000Z DTEND:20140922T160000Z DTSTAMP:20260828T094430Z UID:bkeq6b5mtc246de1fn8gi2pvm8@google.com CREATED:20140711T170412Z DESCRIPTION:Speaker Name: Brian DeMarco \n\nSpeaker Institution: Universit y of Illinois\n\nTitle: Intrinsic Relaxation Dynamics and Cooling in Optic al-Lattice Hubbard Models\n\nAbstract: Knowledge of relaxation dynamics ar ising from inter-particle interactions is central to our understanding of p henomena such as resistivity\, diffusion\, and thermoelectricity. Predicti ng relaxation timescales is a challenging problem for strongly correlated s ystems\, leaving us with many unresolved questions regarding systems such a s Mott-Hubbard materials and a critical need for information from controlle d experiments. Understanding intrinsic relaxation and rethermalization is also central to achieving lower entropies and new quantum phases in optical lattice experiments\, since trapped quantum gases do not thermalize with a reservoir. In this talk\, I will describe how we are addressing these iss ues using ultracold 87Rb and 40K atoms trapped in optical lattices\, which realize the Bose and Fermi-Hubbard models. I will describe new techniques we have developed to drive lattice gases out of equilibrium and measure the resulting relaxation dynamics. I will report measurements of relaxation f or thermal bosons in the superfluid (SF) regime of the Bose-Hubbard (BH) mo del and degenerate fermions in the metallic regime of the Fermi-Hubbard mod el. In both cases\, we find astonishingly fast relaxation timescales and a violation of weakly interacting predictions. These fast relaxation timesc ales enable a new technique for cooling quasimomentum in an optical lattice \, which we demonstrate by cooling bosons in the SF regime of the BH model in a proof-of-principle experiment.\n\nHost: James Williams\n\nJoin with Go ogle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-s eminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.bkeq6b5mtc246de1fn8gi2pvm8&hs=121 LAST-MODIFIED:20140911T190909Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150908T171500Z DTEND:20150908T181500Z DTSTAMP:20260828T094430Z UID:jrrng0ddonrso8t38hbsn16ev8@google.com CREATED:20150904T182454Z DESCRIPTION:Title : Turbulence\, Noise\, and Predictability: Basic Issues f or High-Speed Reactive Flows\nSpeaker Name: Elaina Oran\nSpeaker Institutio n : UMCP\nAbstract : From a science and engineering point of view\, we need to be able to compute the properties of fluid systems with large energy in puts and on scales ranging from of nanometers to megaparsecs. This capabili ty is needed for designing engines for high-speed flow (e.g.\, development of detonation-wave engines)\, ensuring safety in coal mines (e.g.\, from na tural-gas explosions)\, and understanding the universe (e.g.\, determining the physical consequences of supernova explosions in the early and later un iverse). All of these systems may be described by some form of the of the t ime-dependent compressible Navier-Stokes equations\, but with very differin g initial and boundary conditions\, to say nothing of the vastly differing energy source terms. In all of these applications\, turbulence is a fundame ntal issue and a controlling element in the system evolution or performance . Inherent in this are questions of intermittency\, noise\, and predictabil ity. What does this mean in practical terms\, where does it come from\, and what it behavior implies for very high speed flows or very large system? W e will try to describe some of the difficult and confusing issues on which these questions are based.\ncontact: kbalde@umd.edu LAST-MODIFIED:20150904T183116Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151208T160000Z DTEND:20151208T173000Z DTSTAMP:20260828T094430Z UID:tm28jhk2mj0qao9em0r6t2ikfs@google.com CREATED:20151117T214519Z DESCRIPTION:Speaker Name: Johnpierre Paglione \n\nSpeaker Institution: CNAM and Dept of Physics\, University of Maryland\n\nTitle: Topological half-He usler semimetals: a new family of non-centrosymmetric magnetic superconduct ors\n\nAbstract: We report superconductivity and magnetism in the ternary h alf Heusler compounds RPdBi (R : rare earth). In this series\, tuning of th e rare earth f-electron component allows for simultaneous control of both l attice density via lanthanide contraction\, as well as the strength of magn etic interaction via de Gennes scaling\, allowing for a unique tuning of bo th the normal state band inversion strength\, superconducting pairing and m agnetically ordered ground states. Antiferromagnetism with ordering vector (0.5\,0.5\,0.5) occurs below a Néel temperature that scales with de Gennes factor\, while a superconducting transition is simultaneously linearly supp ressed. With superconductivity appearing in a system with non-centrosymmetr ic crystallographic symmetry\, the possibility of spin-triplet Cooper pairi ng with non-trivial topology analogous to that predicted for the normal sta te electronic structure provides a unique and rich opportunity to realize b oth predicted and new exotic excitations in topological materials.\n\nHost: Jed Pixley\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151123T210308Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151120T170000Z DTEND:20151120T210000Z DTSTAMP:20260828T094430Z UID:1kt46nhvqgabhngbiou67r89t8@google.com CREATED:20151116T194604Z DESCRIPTION:Speaker Name: Dave Tsang\, Erik Blaufuss\, Peter Polko\, Andrew Smith\, Jane Dai\, Ke Fang\, Erin Kara\n\nSpeaker Institution : U. of Mary land\n\nAbstract : * Dave Tsang (UMD Astronomy) -- "Classical Mechanics and a New Integrator"\n* Erik Blaufuss (UMD Physics) -- "IceCube’s Latest Resu lts on our\nAstrophysical Neutrino Measurements"\n* Peter Polko (UMD Physic s) -- "Magnetic Alignment of Accretion Disks"\n* Andrew Smith (UMD Physics) -- "Gamma-ray Observations of the Galactic Center"\n* Jane Dai (UMD Physic s) -- "Tidal Disruption Events"\n* Ke Fang (UMD Astronomy) -- "High-Energy Neutrinos from Fast-spinning Newborn\nPulsars"\n* Erin Kara (UMD Astronomy) -- "Accretion Flows Around Black Holes with X-ray\n\nNotes: Free lunch ser ved 12:00-1:00 in the hallway outside of CSS room 2400. Talks begin at 1:00 . LAST-MODIFIED:20151118T152602Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140421T190000Z DTEND:20140421T200000Z DTSTAMP:20260828T094430Z UID:v64tm736mtpmknst9vqqo1c148@google.com CREATED:20140416T160030Z DESCRIPTION:Title: Non-thermal Dark Matter: Prospects and Challenges\n\nSpe aker: Kuver Sinha\, Syracuse\n\nAbstract: Given the ever-shrinking paramete r space for dark matter that satisfies the relic density through thermal fr eeze-out\, it is interesting to explore non-thermal histories for dark matt er. I discuss constraints from indirect and direct detection\, dark radiati on bounds\, and minimal conditions that need to be satisfied for a non-ther mal scenario to work. I also discuss the decay of stabilized moduli in stri ng compactifications and their viability in giving rise to a non-thermal sc enario. LAST-MODIFIED:20140416T160030Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151022T150000Z DTEND:20151022T163000Z DTSTAMP:20260828T094430Z UID:41g00j6li9cu9f0fh4vhlnhke4@google.com CREATED:20151001T215718Z DESCRIPTION:Speaker: Arijeet Pal (Oxford University)\n\nTitle: Finite tempe rature mobility edge in many-body localized systems\n\nAbstract: The ergodi c hypothesis for an isolated quantum system has been a subject of intense i nvestigation in recent years. Under what conditions does a quantum system t hermalize in the absence of a heat bath? It has been argued that in the pre sence of strong disorder\, a system loses its ability to equilibrate itself even at infinite temperature\, a phenomena now known as many-body localiza tion (MBL). I will review the basic notions of this new phase of matter cha racterized by its dynamics. Due to the violation of equilibrium statistical physics in this phase\, MBL protects topological and symmetry-breaking ord ers in situations where they are destroyed at thermal equilibrium.\n\nIn th is talk I will discuss the phase transition between MBL and ergodic phases tuned by energy density\, leading to a finite temperature mobility edge. As concrete examples I will focus on the one-dimensional random-field Heisenb erg and the infinite-dimensional quantum random energy models. The latter h as been a useful mean-field model for analyzing the thermodynamic spin-glas s transition. Its tractability allows the comparison between analytical and numerical study of a finite temperature mobility edge.\n\nHost: Jed Pixley \n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151001T215718Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150313T170000Z DTEND:20150313T180000Z DTSTAMP:20260828T094430Z UID:gq1o9ldkuvn0c9pvqdiv7gkqfs@google.com CREATED:20150224T194139Z DESCRIPTION:Speaker Name: Paula Mellado\n\nSpeaker Institution: Adolfo Ibañ ez University\, Santiago\, Chile\n\nTitle: Bio-inspired microuidics: The ca se of the velvet worm\n\nAbstract : The rapid squirt of a proteinaceous sli me jet endows the ancient velvet worms (Onychophora) with a unique mechanis m for defense from predators and for capturing prey by entangling them in a disordered web that immobilizes their target. However\, to date neither qu alitative nor quantitative descriptions have been provided for this unique adaptation. We have investigated the mechanism that allows velvet worms the fast oscillatory motion of their oral papillae and the exiting liquid jet that oscillates with frequencies ƒ ~ 30 – 60 Hz. Using anatomical images a nd high speed videography\, we show that even without fast muscular action of the papilla\, a strong contraction of the slime reservoir and the geomet ry of the reservoir-papilla system suffices to accelerate the slime to spee ds up to ν ~ 5 m/s in about ∆t ~ 60 ms. A theoretical analysis and a phy sical simulacrum allow us to infer that this fast oscillatory motion is the result of an elastohydrodynamic instability driven by the interplay betwee n the elasticity of oral papillae and the fast unsteady flow during squirti ng. Inspired by the physics of the velvet worm squirting system we propose several applications that can be implemented using this instability. Rangin g from high-throughput droplet production\, printing\, micro-nanofiber prod uction between others. LAST-MODIFIED:20150225T201242Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140224T200000Z DTEND:20140224T210000Z DTSTAMP:20260828T094430Z UID:s1lec947m587gkbnsapn0uit2g@google.com CREATED:20140211T172835Z DESCRIPTION:Title: OPE Methods for the Holomorphic Higgs Portal\n\nSpeaker: Piyush Kumar\, Yale\n\nAbstract: We develop a systematic and general appro ach to study the effective Higgs Lagrangian in a supersymmetric framework i n which the Higgs fields in the visible sector couple weakly to another sec tor. The extra sector may be strongly coupled in general. It is assumed to be superconformal in the ultraviolet\, but develop a mass-gap with supersym metry breaking in the infrared. The main technique used in our approach is that of the operator product expansion (OPE). By using OPE methods we are a ble to compute the parameters in the Higgs Lagrangian to quadratic order an d make general statements that are applicable to many classes of models. No t only does this approach allow us to understand the traditional problems p laguing simple models from a different perspective\, it also reveals new po ssibilities for solutions of these problems. The methods and results of our work should be useful in constructing a viable and natural model of physic s beyond the Standard Model. LAST-MODIFIED:20140211T172835Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141021T140000Z DTEND:20141021T150000Z DTSTAMP:20260828T094430Z UID:ptkkkdqtvjiuq4ri785ufh9s6k@google.com CREATED:20141009T203013Z DESCRIPTION:Speaker Name: Michael Jarret \n\nSpeaker Institution: UMD\n\nT itle: Adiabatic Optimization and Dirichlet Graph Spectra\n\nAbstract: Seve ral previous works have investigated the circumstances under which quantum adiabatic optimization algorithms can tunnel out of local energy minima tha t trap simulated annealing or other classical local search algorithms. Here we pursue two particular questions: (1) do adiabatic optimization algorith ms always succeed in polynomial time for trivial optimization problems in w hich there is only one local minimum and (2) what characterizes the boundar y between large- and small- gapped Hamiltonians? In addressing the first\, we surprisingly find a counterexample in which the potential is a single ba sin on a graph\, but the eigenvalue gap is exponentially small as a functio n of the number of vertices. For the second\, we discover an equivalence be tween adiabatic interpolation Hamiltonians and the Dirichlet spectrum of we ighted graphs. From this observation\, we derive a number of bounds on the eigenvalue gap based on well-studied graph quantities. Additionally\, in th e context of quantum systems exhibiting path- and hypercube-like connectivi ty\, we obtain a discrete analogue to the "fundamental gap theorem\," yield ing a tight lower bound to the eigenvalue gap in the presence of convex pot entials.\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangou ts/_/physics.umd.edu/quics-quantum?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZT BAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ptkkkdqtvjiuq4ri785ufh9s6k&hs=121 LAST-MODIFIED:20141009T203013Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS (Quantum Information and Computer Science) Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160125T210000Z DTEND:20160125T223000Z DTSTAMP:20260828T094430Z UID:gqgej3ppbpoch3gqgcgc2rh41o@google.com CREATED:20160119T181342Z DESCRIPTION:\nSpeaker: Yuhsin Tsai\n\nSpeaker Affiliation: UMD\n\nTitle: Ex otic Signals in Twin Higgs Model\n \nAbstract: Twin Higgs (TH) model gives a naturalness motivation to study the non-colored BSM particles\, which usu ally have decay processes relating to the dark-hadronization and displaced signal. In this talk\, I will use the exotic twin-quarks to discuss the sea rch of these decays. The exotic-quarks play a vital role in UV completing t he TH model\, and their decay products contain both SM particles and twin-h adrons\, including twin-glueballs\, mesons\, and leptons. These twin-object s decay displacedly into SM b-quarks or leptons\, and the striking signal a llows the reach of twin UV-physics at the LHC and future collider. Interest ing complimentarily constraints between collider and astrophysical search w ill also be discussed. LAST-MODIFIED:20160125T142953Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - Canceled due to weather TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141103T200000Z DTEND:20141103T210000Z DTSTAMP:20260828T094430Z UID:j41g4iluvhmm6aonrr0nj69o4k@google.com CREATED:20141103T151155Z DESCRIPTION:Speaker Name: Fereshte Ghahari\n\nSpeaker Institution: Columbia / Harvard\n\nTitle: Interaction effects on electric and thermoelectric tra nsport in graphene\n\nAbstract: The observation of correlated electron phy sics in graphene is mostly limited by strong electron scattering that is ca used by charge impurities. We fabricate devices in which electrically conta cted and electrostatically gated graphene flakes are either suspended over a SiO2 substrate or deposited on a hexagonal boron nitride layer such that a drastic suppression of disorder is achieved. The mobility of our graphene flakes exceeds 100\,000 cm2/Vs. This very high mobility allows us to obser ve previously inaccessible transport regimes. In particular\, we succeeded to observe the fractional quantum Hall Effect for the first time\, hereby s upporting the existence of interaction induced correlated electron states i n the presence of a magnetic field. We were able to measure the energy gap associated with the fractional ν=1/3 state. This gap is at least 3 times la rger than that of the 2DEGs in the best quality GaAs heterojunctions in a similar field range. Apart from that\, we probed the e-e correlations in g raphene by means of thermopower measurements. Our results show that at high temperatures the measured thermopower deviates from the generally accepted Mott‘s formula and that this deviation increases for samples with higher m obility. We quantify this deviation in both the degenerate and the non-dege nerate regime using Boltzmann transport theory. We consider different scatt ering mechanisms in the system including electron-electron scattering. We also investigated Thermopower in the quantum Hall regime\, where we observe the quantized thermopower at intermediate fields.\n\nHost: Mohammad Hafezi \n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/phy sics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAu Y2FsZW5kYXIuZ29vZ2xlLmNvbQ.j41g4iluvhmm6aonrr0nj69o4k&hs=121 LAST-MODIFIED:20141103T151155Z LOCATION:2115 CSS Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140925T180000Z DTEND:20140925T193000Z DTSTAMP:20260828T094430Z UID:mm50fncalg34idf8ii2ghjr8fk@google.com CREATED:20140828T212129Z DESCRIPTION:Speaker Name: Javad Shabani\n\nSpeaker Institution: UCSB\n\nTi tle: Fabrication and characterization of gate-defined structures in epitaxi ally grown InAs heterostructures\n\nAbstract: Theory and recent experiments suggest that nanowires of narrow band gap semiconductors\, such as InAs\, are a suitable platform for realization of topological states of matter. Mo lecular beam epitaxy (MBE) growth of large area InAs two-dimensional system s (2DESs) combined with semiconductor processing techniques (top-down appro ach) provides an avenue toward substantially more complex architectures tha n can be achieved using vapor-liquid-solid self-assembled nanowires. Fabric ation of gate-defined devices on these heterostructures is highly desirable as it offers the possibility of tuning confinement potential\, carrier den sity and spin orbit coupling while maintaining the mobility of the parent 2 DES. However\, reliable gating has proven difficult in InAs due to gate lea kage and hysteretic behavior. In this talk\, we show that these difficultie s could be surmounted using epitaxial growth of strained InAs quantum wells in metamorphic heterostructures. At liquid helium temperature electron mob ilities in excess of 600\,000 cm^2/Vs are now achieved. The gate-controlled mobility dependence on carrier density indicates mobility is limited due t o scattering from background impurities. Consistent with this picture\, we find a metal insulator transition at very low critical density. We also dem onstrate the first gate-defined one-dimensional channels on high mobility I nAs 2DES and discuss their future prospects for fabricating complicated wir e networks.\n\nHost: James Williams\n\nJoin with Google Hangouts: https:// hangouts.google.com/hangouts/_/physics.umd.edu/cnam-condensed?hceid=bGJrNjY wYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mm50fncalg3 4idf8ii2ghjr8fk&hs=121 LAST-MODIFIED:20140919T191253Z LOCATION:phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150519T150000Z DTEND:20150519T160000Z DTSTAMP:20260828T094430Z UID:5vg40j1gt1ee62i8tba7bm7nhg@google.com CREATED:20150513T203224Z DESCRIPTION:Speaker Name: T. (Venky) Venkatesan\n\nSpeaker Institution: NU SNNI-NanoCore\, National University of Singapore\n\nTitle: Novel Transport in Oxide Layers\, heterostructures and Interfaces\n\nAbstract: In this tal k I will describe a number of experiments involving transport in highly cor related electronic systems.\n\nWe have prepared epitaxial films of VO2 A an d B phases for the first time. Compared to the M phase these phases have di fferent crystal structure and also completely different transport propertie s. The A phase films are almost insulating while the B phase films show a b road metal insulator transition starting at 150K extending beyond room temp erature. Surprisingly the composites of the A and B phases show the sharp m etal insulator phase transition (MIT) observed in the VO2 M to R phase. Sur prisingly this composite does not show any structural phase transition in x -ray diffraction across the MIT nor does this show any evidence for any M p hase. This result more or less settles the 60 year old debate as to whether the crystallographic transition or the V dimerization transition drives th is MIT in the VO2 system.\n\nBy depositing an amorphous layer of LaAlO3 we are able to generate a 2 D electron gas on the surface of TiO2 anatase\, ru tile and TiO2 terminated SrTiO3 surfaces. Thus we are able to compare the t ransport properties of three different TiO2 systems. We show that the Ti-O- Ti bond angles are crucial to the mobility observed in these systems and th e Ti 3d orbital degeneracy determines the nature of the carriers dominant a t different temperatures.\nI would also like to discuss a new family of oxi des MNbO3 (M = Sr\, Ca\, Ba) which show a strong propensity for water split ting. This family of materials is extremely unusual in the sense that they have a large bandgap of > 4 eV but when oxygen vacancies are created they t end to form a mid-gap defect band with a very large density of states beyon d the Mott limit giving rise to a mid-gap conduction band with carriers in excess of 1022 cm-3. The resultant gaps absorb solar radiation efficiently. Remarkably the excited state electron decay times from the conduction band are extremely long which may be contributing to their water splitting effi ciency.\n\nBIOGRAPHY: (short)\n\nProf. T. Venkatesan is currently the Dire ctor of the Nano Institute at the National University of Singapore (NUSNNI) where he is a Professor of ECE\, MSE\, NGS and Physics. He wore various ha ts at Bell Labs and Bellcore for about 17 years before becoming a Professor at University of Maryland for another 17 years. As the inventor of the pul sed laser deposition (PLD) process\, he has over 650 papers and 30 patents in the area of Oxide thin films and is globally among the top one hundred p hysicists (ranked at 66 in 2000) in terms of his citations (Over 32\,710 wi th a Hirsch Index of 92). He has graduated over 34 PhDs\, 35 Post Docs and over 40 undergraduates. He is also the founder and Chairman of Neocera\, a company specializing in the area of PLD and magnetic field imaging systems. Close to 10 of the researchers (PhD students and Post Docs) under him have become entrepreneurs starting over 17 different commercial enterprises. He is a Fellow of the APS\, winner of the Bellcore Award of excellence\, Winn er of the George E. Pake Prize awarded by APS (2012)\, President’s gold med al of the Institute of Physics Singapore\, academician of the Asia Pacific Academy of Materials\, Fellow of the World Innovation Forum\, was a member of the Physics Policy Committee\, guest Professor at Tsinghua University Be ijing\, the Board of Visitors at UMD and the Chairman\, Forum of Industry a nd Applications of Physics at APS.\n\nHOST: Rick Greene\n\n \n LAST-MODIFIED:20150514T202836Z LOCATION:CNAM Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:SPECIAL CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150617T190000Z DTEND:20150617T200000Z DTSTAMP:20260828T094430Z UID:n9flq5k74idrgelt0m4du17108@google.com CREATED:20150610T125150Z DESCRIPTION:Speaker Name: Prof. Eric Williams\n\nSpeaker Institution: Roche ster Institute of Technology\n\nTitle: Technological progress and energy po licy: case studies of wind\, batteries\, and electric vehicles\n\nAbstract: Future technologies have the potential to transform the environmental\, soc ial and economic landscape. While the long-term is a subject of speculation \, the next decade or two should be tractable to a degree of foresight. The development of energy technologies is particularly important for sustainab ility. This talk explores the use of retrospective forecasting\, in partic ular the experience curve\, in understanding cost reductions and diffusion of energy technologies. In a case study of wind power\, we develop an impr oved experience curve model that resolves disagreements between prior studi es. We find that wind has a promising future of cost reductions\, 3 cents/k Wh\, if historical trends continue. In a case study of energy storage\, we find that the non-material costs of lead batteries have been steadily reduc ing the last several decades. This has implications for emerging technologi es such as lithium batteries\, since they must outcompete an improving\, ra ther that static\, incumbent.\n\nThe interaction of cost reductions and het erogeneity of benefits to consumers is explored for Plug-in Hybrid Electric Vehicles (PHEV) in the U.S. If gasoline prices return to pre-dip levels\, PHEVs have the potential to fall in cost so as to deliver economic benefits to millions of U.S. drivers. The current subsidy of $7\,500 per vehicle ca n thus be viewed as an investment to activate a larger market with direct e conomic benefits. Through this lens\, the post diffusion subsidy cost per v ehicle is reduced by over 90%\, suggesting that the current PHEV subsidy is in the public interest.\nBio: Originally trained in theoretical physics\, Eric Williams began work on sustainability related systems assessment of te chnology at the United Nations University in Tokyo. Returning to the U.S. f irst to Carnegie Mellon and then to Arizona State University\, he is now As sociate Professor at the Golisano Institute of Sustainability at the Roches ter Institute of Technology. Eric’s research focuses on modeling energy and materials flows to gain insights into sustainability impacts and managemen t of new technologies. Much of his work has focused on information technolo gy\, such as characterization of materials flows in semiconductor and compu ter manufacturing and international management of electronic waste. He test ified before Congress on electronic waste and his IT work has been widely c overed in the media in outlets such as USA Today\, Science\, and the BBC. E ric’s recent research focuses on understanding progress and diffusion of em erging energy technologies using perspectives such as experience curves\, c onsumer market heterogeneity\, and thermodynamic limits.\n LAST-MODIFIED:20150610T125621Z LOCATION:Computer and Space Sciences Building (CSS)\, Room 4301 (Frank McDo nald Conference Room in the old wing) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Seminar-Professor Eric Williams TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150416T163000Z DTEND:20150416T173000Z DTSTAMP:20260828T094430Z UID:mo763v0a4q5mt8o15tcb77vp7g@google.com CREATED:20150409T154014Z DESCRIPTION:Speaker Name: Paul Rapp\n\nSpeaker Institution : Uniformed Serv ices University of the Health Services (Bethesda\, MD)\n\nTitle: Hierarchi al transition chronometries in the human central nervious system\n\n LAST-MODIFIED:20150409T154820Z LOCATION:IREAP Conference Room ERF1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150728T200000Z DTEND:20150728T210000Z DTSTAMP:20260828T094430Z UID:88nelsl5hkg04s87b20sscta28@google.com CREATED:20150721T182434Z DESCRIPTION:2015 Andrew Germant Award Lecture by Science Communicator Ainis sa Ramirez \nIt wasn’t that long ago when Sputnik -- a beach-ball size sate llite -- was launched into the Russian sky and galvanized America to reexam ine its commitment to science education. Today\, we need to make a similar recommitment to science\, technology\, engineering and math (STEM) as evide nced by our international testing scores. Yet the numbers on a page do not garner the same reaction as that satellite did long ago. Additionally\, tho se who do STEM do not reflect the demographic of our nation\, which means t hat not all perspectives are part of this larger national conversation. Mor eover\, as new materials are made\, such as nanotechnology\, all citizens n eed to be aware of the impact of such innovations—both positive and negativ e. This current situation underscores the value of science teachers. This t alk will make a case for the importance of STEM education\, will discuss so me of the\nfascinating work in nanotechnology\, and will emphasize why scie nce teachers are key to not only improving science literacy\, but to sustai ning democracy.\n LAST-MODIFIED:20150721T182434Z LOCATION:Hoff Theater/Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Our Sputnik Moment in STEM Education TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140929T190000Z DTEND:20140929T203000Z DTSTAMP:20260828T094430Z UID:7cp9mcidqpnau5ntdcvgb4eoac@google.com CREATED:20140722T155712Z DESCRIPTION:Speaker Name: Daniel Stolarski\n\nSpeaker Institution: CERN\n\n Title: Emerging Jets\n\nAbstract: I will describe a new collider object we have termed emerging jets.\nThese can arise when there is a confining dark sector connected to the\nStandard Model by a TeV scale mediator\, a scenari o that is well\nmotivated by dark matter considerations. The signature of a n emerging\njet is O(10) displaced vertices inside the jet each with differ ent\nimpact parameter\, and a small number of prompt tracks. I will describ e\nstrategies that can be used to discover emerging jets even if they\nhave very small cross sections.\n\nJoin with Google Hangouts: https://hangouts. google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDd lazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7cp9mcidqpnau5ntdcvgb4e oac&hs=121 LAST-MODIFIED:20140925T165349Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141007T200000Z DTEND:20141007T210000Z DTSTAMP:20260828T094430Z UID:nghva08h52dkujiuom62uf7u0g@google.com CREATED:20140718T145335Z DESCRIPTION:Speaker Name: Anneke Levelt Sengers\n\nSpeaker Institution: N IST\n\nTitle: Pride and Prejudice in Science and Engineering\n\nAbstract: During my career I have worked with scientists\, engineers\, and postdocto ral collaborators\, both men and women\, from the US and from many foreign countries. In the past ten years\, within the context of the Network of the Academies of Sciences (www.iap.org)\, I have chaired first a global\, then a Western Hemisphere initiative (www.ianas.org) addressing the low represe ntation of women in science and technology. Sociologists have produced soli d evidence of gender prejudice even within the physical \nsciences that tak e pride in their objectivity. The IANAS book: “Women Scientists in the Amer icas\; their Inspiring Stories” strikingly illustrates culture-dependent ge nder prejudice that keeps the physical sciences and engineering preponderan tly male occupations in countries such as the US\, UK\, and Germany. The ne ar-absence of women from engineering\, and ignorance about local culture an d gender roles adversely affect development work by foreign male engineers serving the poor in the third world. Indeed\, both women engineers and soci al scientists have unique roles to play in overcoming cultural prejudices w hich waste women’s talents and hamper development work.\n\n\n\n\n\nJoin wit h Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/p hysics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2 xlLmNvbQ.nghva08h52dkujiuom62uf7u0g&hs=121 LAST-MODIFIED:20140818T171108Z LOCATION:Physics 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium-Shih-I Pai Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140915T210000Z DTEND:20140915T220000Z DTSTAMP:20260828T094430Z UID:837gmd1r7vku73rosgm10jqot4@google.com CREATED:20140915T135143Z DESCRIPTION:Speaker Name: Jeffrey Klauda\n\nSpeaker Institution : Universit y of Maryland\n\nTitle : Simulations of Cell Membranes: Developing Accurate Lipid Force Fields and Probing Conformational Changes in Membrane Transpor ters\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAu Y2FsZW5kYXIuZ29vZ2xlLmNvbQ.837gmd1r7vku73rosgm10jqot4&hs=121 LAST-MODIFIED:20140915T174200Z LOCATION:Room 0112\, Marker Seminar Room\, Chemistry Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150306T200000Z DTEND:20150306T213000Z DTSTAMP:20260828T094430Z UID:t62n8rq6l5lcvov3e5bpj106a0@google.com CREATED:20150220T182021Z DESCRIPTION:Speaker Name: Dr. Rachel Carr\n\nSpeaker Institution: Columbia University\n\nTitle: Entering the Two-Detector Phase of the Double Chooz Ex periment\n\nAbstract: In 2011\, Double Chooz became the first reactor-based experiment to indicate a nonzero value of the neutrino mixing parameter th eta_13. This observation was made with a single detector located approximat ely 1 km from the two cores of the Chooz Nuclear Power Plant in northeaster n France. Since then\, we have increased the precision of our single-detect or theta_13 measurements through a variety of novel techniques. Now\, as ou r near detector takes its first months of data\, we can begin to suppress t he reactor flux uncertainty which dominated previous analyses. I will repor t the most recent Double Chooz results\, projected reach in theta_13\, and prospects for additional physics measurements.\n\n\n LAST-MODIFIED:20150227T165155Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141205T190000Z DTEND:20141205T203000Z DTSTAMP:20260828T094430Z UID:0ulr2if8jicijf40r0ct9lkm04@google.com CREATED:20141119T184404Z DESCRIPTION:Title: Strong Cosmic Censorship\n\nSpeaker: Jim Isenberg\, Univ ersity of Oregon\n\nAbstract: The Hawking-Penrose theorems tell us that sol utions of Einstein's equations are generally singular\, in the sense of the incompleteness of causal geodesics (the paths of physical observers). Thes e singularities might be marked by the blowup of curvature and therefore cr ushing tidal forces\, or by the breakdown of physical determinism. Penrose has conjectured (in his "Strong Cosmic Censorship Conjecture") that it is generically unbounded curvature that causes singularities\, rather than cau sal breakdown. The verification that “BKL behavior” (marked by the dominati on of time derivatives over space derivatives) is generically present in a family of solutions has proven to be a useful tool for studying Strong Cos mic Censorship in that family. We discuss what is known about BKL behavior and Strong Cosmic Censorship in families of solutions defined by varying de grees of isometry\, and discuss new results which we believe will extend th is knowledge and provide new support for Strong Cosmic Censorship.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.ed u/gravity-theory?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5k YXIuZ29vZ2xlLmNvbQ.0ulr2if8jicijf40r0ct9lkm04&hs=121 LAST-MODIFIED:20141120T153205Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160208T213000Z DTEND:20160208T223000Z DTSTAMP:20260828T094430Z UID:imli94vrermvri145ni7905674@google.com CREATED:20160201T162141Z DESCRIPTION:Speaker Name: Ryun-Young Kwon\n\nSpeaker Institution : George M ason University & JHU Applied Physics Lab\n\nTitle : The role of solar supe rnova-shaped shock waves in longitudinal properties of widespread solar ene rgetic particle events\n\nAbstract : We discuss how and where the solar ene rgetic particles (SEPs) are accelerated by the solar eruptions and how SEPs injected with a single flare-coronal mass ejection (CME) event reach a wid e range of heliospheric longitudes and latitudes.\nhttp://space.umd.edu/sem inars/showAbstract/0208161630\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20160201T204645Z LOCATION:CSS Building Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151007T200000Z DTEND:20151007T213000Z DTSTAMP:20260828T094430Z UID:12ovsvern4bfurjmgemmd6731o@google.com CREATED:20151002T144656Z DESCRIPTION:Title : "Measurement of the Top-quark Mass from the b Jet Energ y Spectrum"\nSpeaker Name: Francisco Yumiceva\nSpeaker Institution : Florid a Institute of Technology\nAbstract: Precise measurements of the top-quark mass are crucial to test current and new theories of particle physics. I wi ll present a recent measurement of the top-quark mass using the peak positi on of the energy distribution of b jets from top-quark decays. This analysi s is based on a recent theoretical idea that is simpler but complementary t o the standard methods. The measurement is performed in dileptons events wi th one electron and one muon in the final state in pp collision data at sqr t(s)= 8 TeV collected by the CMS experiment. LAST-MODIFIED:20151002T144715Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151111T190000Z DTEND:20151111T203000Z DTSTAMP:20260828T094430Z UID:ucp0pkjp4dttu362896sgbbmn0@google.com CREATED:20151028T144344Z DESCRIPTION:Speaker: Ted Jacobson\n\nSpeaker Institution: UMD\n\nTitle: Ein stein equation and vacuum entanglement equilibrium\n\nAbstract: I will disc uss the hypothesis that entanglement entropy in any "small" geodesic ball o f fixed volume is maximized in the vacuum. The Einstein equation supports t his hypothesis\, which in turn implies the Einstein equation modulo some ca veats that will be explained. LAST-MODIFIED:20151028T144344Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151110T181500Z DTEND:20151110T193000Z DTSTAMP:20260828T094430Z UID:bgrsm3a97j4va9jpulv4q7h1s0@google.com CREATED:20151104T142537Z DESCRIPTION:Speaker Name: Gavin Crooks\n\nSpeaker Institution : Lawrence Be rkeley National Laboratory\n\nTitle:Optimal Thermodynamic Control and the G eometry of Ising magnets\n\nAbstract : A major impediment to a quantitative understanding of molecular-scale machines is that they operate out of ther modynamic equilibrium. However\, if the system is not too far from equilibr ium\, then optimal (minimum dissipation) thermodynamic control is governed by a fiction metric that generates a Riemannian geometry on thermodynamic s tate space. I'll discuss the Riemannian geometry of the Ising model\, a qui ntessential model of statistical mechanics that described the thermodynamic s of ferromagnetic and fluid systems. \n LAST-MODIFIED:20151104T143315Z LOCATION:IPST Building\, Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150423T193000Z DTEND:20150423T203000Z DTSTAMP:20260828T094430Z UID:eksjh8jpig9hdnt4t1mvtq6srk@google.com CREATED:20150417T171305Z DESCRIPTION:Speaker: Jim Gates\nAbstract: Further discussion of S. J. Gates \, "Ectoplasm Has No Topology: The Prelude"\, arXiv:hep-th/9709104\, and i ts connection with the Witten paper on integration. LAST-MODIFIED:20150417T171305Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to "ectoplasm" (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150911T170000Z DTEND:20150911T180000Z DTSTAMP:20260828T094430Z UID:9hs50js30u6vjkoatfisagksnc@google.com CREATED:20150824T183014Z DESCRIPTION:Title : Electron Beam Generated Plasmas: Ultra low Te Sources f or Atomic Layer Processing\nSpeaker Name: Scott Walton\, Naval Research Lab oratory\n\nAbstract : The advantages of plasma-based materials processing t echniques are numerous. The capability to rapidly modify large (> 103 cm2) areas with precision down to a fraction of a micron is one reason plasmas a re widely used in the materials and surface engineering communities. Howeve r\, with the rapidly evolving demand for new materials and single nanometer -scale precision across a variety of applications\, some of the limitations of conventional plasma sources are becoming apparent. The lack of process control and excessive ion energies in the development of atomic layer proce ssing strategies are examples.\n\nThe Naval Research Laboratory (NRL) has d eveloped a processing system based on an electron beam-generated plasma. Un like conventional discharges produced by electric fields (DC\, RF\, microwa ve\, etc.)\, ionization is driven by a high-energy (~ keV) electron beam\, an approach that can overcome many of the problems associated with conventi onal plasma processing systems. Importantly\, high plasma densities (1010- 1011 cm-3) can be produced in electron beam generated plasmas\, while the e lectron temperature remains between 0.3 and 1.0 eV. Accordingly\, a large f lux ions can be delivered to substrate surfaces with kinetic energies in th e range of 1 to 5 eV\, a value comparable to the bond strength in most mate rials. This provides the potential for controllably etching and/or engineer ing both the surface morphology and chemistry with monolayer precision.\n\n An overview of NRL’s research efforts in developing this technology will be presented\, with a focus on source development\, plasma characterizations\ , and materials processing. Particular attention will be given to the proce ssing of polymers\, graphene\, and select semiconductor materials\, where w e take advantage of the unique attributes of electron beam generated plasma s to engineer the surface properties of these materials for specific applic ations. This work is supported by the Naval Research Laboratory base progra m. LAST-MODIFIED:20150824T183609Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141030T173000Z DTEND:20141030T180000Z DTSTAMP:20260828T094430Z UID:7nfi2jeqb1k05df338ml56oqd4@google.com CREATED:20140828T215306Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7nfi2jeqb1k05df338ml56oqd4&hs=121 LAST-MODIFIED:20140828T215312Z LOCATION:physics room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141112T210000Z DTEND:20141112T220000Z DTSTAMP:20260828T094430Z UID:cc847h2o8un5in9uanqapkjlas@google.com CREATED:20141107T145011Z DESCRIPTION:Speaker Name: Marguerite Tonjes\n\nSpeaker Institution : Univer sity of Maryland\n\nTitle: The Latest CMS Heavy-Ion Jet Results\n\nAbstrac t : Jet studies provide an experimental method to explore the features of e nergy loss in the strongly interacting quark-gluon plasma. Recent jet resul ts from 2.76 TeV PbPb and pp collisions measured with the CMS detector are presented. Jets in the most head-on (central) PbPb collisions are quenched in comparison to pp\, and the jets fragment in different ways in the two s ystems. Measurements from pPb collisions at 5.02 TeV show that the jet and charged particle suppression seen in central PbPb measurements are not due to initial state nuclear effects.\n\nJoin with Google Hangouts: https://ha ngouts.google.com/hangouts/_/physics.umd.edu/high-energy?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.cc847h2o8un5in9u anqapkjlas&hs=121 LAST-MODIFIED:20141107T145011Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151029T150000Z DTEND:20151029T163000Z DTSTAMP:20260828T094430Z UID:gfe5r86vc1s2q6hiu8uck07s9k@google.com CREATED:20151019T205448Z DESCRIPTION:Speaker Name: Amir Yacoby \n\nSpeaker Institution: Harvard Uni versity\n\nTitle: Induced Superconductivity in Materials with Strong Spin-O rbit Interaction\n\nAbstract: Conventional s-wave superconductivity is unde rstood to arise from singlet pairing of electrons with opposite Fermi momen ta\, forming Cooper pairs whose net momentum is zero. Several recent studie s have focused on structures where such conventional s-wave superconductors are coupled to systems with an unusual configuration of electronic spin an d momentum at the Fermi surface. Under these conditions\, the nature of the paired state can be modified and the system may even undergo a topological phase transition. Here we present measurements and theoretical calculation s of several HgTe quantum wells coupled to either aluminum or niobium super conductors and subject to a magnetic field in the plane of the quantum well . By studying the oscillatory response of Josephson interference to the mag nitude of the in-plane magnetic field\, we find that the induced pairing wi thin the quantum well oscillates between singlet and triplet pairing and is spatially varying. Cooper pairs acquire a tunable momentum that grows with magnetic field strength\, directly reflecting the response of the spin-dep endent Fermi surfaces to the in-plane magnetic field. Our new understanding of the interplay between spin physics and superconductivity introduces a w ay to spatially engineer the order parameter\, as well as a general framewo rk within which to investigate electronic spin texture at the Fermi surface of materials.\n\nHost: Sankar Das Sarma\n\nhttp://www.physics.umd.edu/cmtc /seminars.html LAST-MODIFIED:20151028T194536Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JOINT CMTC/JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151130T110000 DTEND;TZID=America/New_York:20151130T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151130T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Eugene Simon Polzik\n\nSpeaker Institution: Univ ersity of Copenhagen\, Denmark\n\nTitle: Beyond The Heisenberg Uncertainty Principle with Negative Mass Oscillators\n\nAbstract: Quantum oscillators r anging from a collective spin of an atomic\nensemble to a mechanical oscill ator to an electrical oscillator are\ncentral in many areas of physics. Gen eration of interesting quantum\nstates of such oscillators allows\, for exa mple\, performing the most\nprecise measurements. We have recently demonstr ated that a squeezed\nstate of a spin oscillator for which one quadrature h as fluctuations\nbelow the ground state level can be generated by a strobos copic\nquantum nondemolition measurement. However\, sensing with the precis ion\nbeyond the vacuum state uncertainty in both position and momentum\,\nw hich appears to be prohibited by the uncertainty principle is\nevenmore int riguing. We have demonstrated that this limitation can be\novercome by enta ngling an oscillator with a reference oscillator\ncharacterized by an effec tive negative mass. The core idea is to\ncancel the measurement back action of the joint measurement on the two\noscillators. Progress with the experi mental demonstration of the back\naction cancellation for a macroscopic mec hanical oscillator and a\nreference spin oscillator will be presented. In a more general sense\,\nthis approach leads to trajectories without quantum uncertainties and\nto achieving new fundamental bounds on the measurement p recision. LAST-MODIFIED:20151125T130533Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141121T160000Z DTEND:20141121T210000Z DTSTAMP:20260828T094430Z UID:sjbbjoakt5tmaeiub6jlbcjubg@google.com CREATED:20141020T213731Z DESCRIPTION:Talk schedule:\n\n11:00 AM Maissam Barkeshli\, Coherent Transm utation of Electrons into Fractionalized Anyons\n\n11:45 AM Jay Sau\, Smok ing gun detection of majorana modes through nonlocal "teleportation"\n\n1:3 0 PM Xin Wang\, Robust control of a spin qubit using noise-compensating pu lses\n\n2:15 PM Jason Kestner\, Dynamical correction of two exchange-coupl ed spin qubits\n\n3:00 PM Edwin Barnes\, Robust quantum control using smoo th pulses and topological winding\n\nThe entire talk schedule can be found at http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20141020T213731Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 6 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20151116T210000Z DTEND:20151116T220000Z DTSTAMP:20260828T094430Z UID:elp5aa28oef358e0213ei9ef5c@google.com CREATED:20151111T144405Z DESCRIPTION:Speaker Name: Giuliano Scarcelli\n\nSpeaker Institution : NIH/N IST\n\nTitle : Brillouin microscopy to image tissue and cell mechanical pro perties\n\nAbstract : Mechanical moduli of biological tissues and polymers are critically involved in various biological and engineering processes\, s uch as disease progression\, aging\, tissue and cell engineering\, drug del ivery\, as well as bonding and micro fabrication. However\, it has been dif ficult to measure the material properties that are heterogeneous in three-d imensional (3D) space and may vary over time\, as this requires a noncontac t noninvasive technique with high spatiotemporal resolution. Here we introd uce biomechanical optical imaging based on Brillouin light scattering media ted by acoustic phonons inherently present in material. Measuring the frequ ency shift and linewidth of Brillouin spectrum allows determining the visco elastic properties of the material. In the past few years\, we have develop ed a multistage parallel spectrometer with high spectral resolution (sub-GH z)\, 80-dB extinction and several-orders-of-magnitude higher throughput eff iciency than conventional scanni! ng interferometers. The first area of bio medical applications we have investigated is ophthalmology where Brillouin microscopy enable measuring changes in corneal and lens elasticity by aging \, by the progression of disease\, or in response to treatment and drugs. W e are now transitioning to the characterization of intracellular and extrac ellular elasticity. LAST-MODIFIED:20151111T173956Z LOCATION:0112 CHEM (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140204T210000Z DTEND:20140204T220000Z DTSTAMP:20260828T094430Z UID:l2ikdshesre5i9u1bblim15h3o@google.com CREATED:20140113T202037Z DESCRIPTION:Speaker: Ramesh Narayan\n\nInstitution: Harvard-Smithsonian C enter for Astrophysics\n\nTitle: Astrophysical Black Holes\n\nAbstract: Ast rophysicists have discovered two populations of black holes in the\nunivers e: stellar-mass black holes with masses in the range 5 to 20 solar masses\, and supermassive black holes with masses in the range million to several b illion solar masses. According to the general theory of relativity\, each black hole is completely described with just two parameters: its mass and i ts spin. Measuring these two parameters for individual black holes and rela ting the measured values to specific observational manifestations of the ho les is a major area of research. The talk will review some recent progress in this field.\n LAST-MODIFIED:20140128T183826Z LOCATION:Phys 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140203T183000Z DTEND:20140203T193000Z DTSTAMP:20260828T094430Z UID:7aajc6182u3jut0vssj3m6f4fk@google.com CREATED:20140116T172243Z DESCRIPTION:Title: Hadron structure calculations in lattice QCD: from flavo r physics to the proton radius\n\nSpeaker: Stefan Meinel\, MIT\n\nAbstract: Lattice QCD allows the calculation of hadronic matrix elements from first principles. In this talk\, I will discuss two interesting applications: the search for new physics in weak decays of bottom hadrons\, and the study of the structure of protons and neutrons. Using lattice QCD results for the B -> K* transition form factors\, I will examine recent hints of deviations from the Standard Model in the rare decay B -> K* mu+ mu-. I will also pres ent lattice calculations for the baryonic decay Lambda_b -> Lambda mu+ mu-\ , which is sensitive to the same short-distance physics. Finally\, I will d iscuss ongoing calculations of nucleon structure observables\, including th e proton charge radius\, for which there is an unexplained discrepancy betw een experimental measurements with electrons and muons. LAST-MODIFIED:20140127T145922Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140417T190000Z DTEND:20140417T200000Z DTSTAMP:20260828T094430Z UID:jti7t95utt5suht8mdas52vcm0@google.com CREATED:20140409T131458Z DESCRIPTION:Speaker: Paul Green (UMCP)\nAbstract: A spin structure\, or spi nor bundle\, on a circle or Riemann surface is a square root of the one(re spectively real or complex)-dimensional tangent bundle. By interpreting the Jacobi identities for a super-Lie algebra in a conceptual way \, which mak es it unnecessary to worry about signs\, we are able to assign\, in a uniq ue way\, an infinite dimensional super-Lie algebra structure to every circ le or Riemann surface with spin structure\, where the even part consists of smooth (respectively\, meromorphic) vector fields\, and the odd part cons ists of sections of the spinor bundle. All of this plays an important ro le in analyzing the concept of a conformal field theory in the sense of Seg al. LAST-MODIFIED:20140409T131458Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Super-Riemann surfaces TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160328T201500Z DTEND:20160328T214500Z DTSTAMP:20260828T094430Z UID:3pf4qni4q7o598sjl6715m659g@google.com CREATED:20160303T195947Z DESCRIPTION:Speaker: Ilias Cholis\n\nSpeaker Institution: Johns Hopkins\n\n Title: Did LIGO detect dark matter?\n\nPlease note start time is 4:15pm\n\n Abstract: Recently Advanced LIGO has detected an event of Binary Black Hole coalescence. I will discuss those generic recent results and LIGOs future capacities in detecting gravitational waves. I will also consider the possi bility that the black-hole binary detected may have something to do with da rk matter. There remains a window for masses ~10 M⊙ and 100 M⊙ where primor dial black holes may constitute the dark matter. If two black holes in a ga lactic halo pass sufficiently close\, they can radiate enough energy in gra vitational waves to become gravitationally bound. The bound black holes wil l then rapidly spiral inward due to emission of gravitational radiation and ultimately merge. Within reasonable estimates\, gravitational waves from p rimordial black holes span a range that overlaps the 2 − 53 Gpc^−3 yr^−1 ra te estimated from the event observed at LIGO\, thus raising the possibility that LIGO may have detected PBH dark matter. LAST-MODIFIED:20160303T195959Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150324T150000Z DTEND:20150324T163000Z DTSTAMP:20260828T094430Z UID:o7ml3gc575kpl26dkku2qags2k@google.com CREATED:20150312T184833Z DESCRIPTION:This is an informal discussion so may not follow the format of the usual EPT Seminar. \n\nTitle: A New Approach to the Hierarchy Problem\n \nSpeaker: Peter Graham\, Stanford\n\nAbstract: There is a debate whether f ine-tuning problems like the hierarchy problem are solved by dynamics or a landscape. We propose a third class of solutions to the hierarchy problem in which the weak scale appears tuned from the particle content of the theo ry but is in fact natural because it is driven to its current value in the early universe. This dynamical relaxation method for the weak scale can be realized in several possible models which generically have a light scalar like the axion. In the simplest model\, the same axion degree of freedom a ddresses both the strong CP and hierarchy problems\, and could potentially be the dark matter.\n\n\n LAST-MODIFIED:20150323T130442Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150304T203000Z DTEND:20150304T213000Z DTSTAMP:20260828T094430Z UID:h30d5jejbuf5ga9dfrq7v57r88@google.com CREATED:20150227T160401Z DESCRIPTION:Speaker Name: Dr. Miao Yu\n\nSpeaker Institution : Dept. of Mec hanical Enginneering\, UMCP\n\nTitle : Transforming acoustic sensing: from bio-inspiration to application of advanced materials\n\nAbstract : Acoustic sensors play an important role in many areas\, such as safety (e.g.\, sona r arrays)\, public health (e.g.\, ultrasonic imaging)\, surveillance (e.g.\ , underwater communication and navigation)\, and industry (e.g.\, non-destr uctive damage detection). However\, conventional acoustic sensors inevitabl y suffer from some fundamental limitations\, which hinder the performance o f current acoustic technologies. In this talk\, various efforts on the deve lopment of acoustic sensors that can potentially overcome these limitations at the Sensors and Actuators Laboratory (SAL) of the University of Marylan d will be discussed. First\, we will discuss how learning from nature can h elp overcome the fundamental size constraint of directional acoustic sensor s. In nature\, one striking innovation to overcoming this constraint is fou nd in the parasitic fly Ormia ochracea. The auditory receptors are forcibly set close to each other (500 microns apart) while exhibiting a remarkable ability to localize its host at 5 kHz. We will show how the understanding o f the underlying biophysics of fly ear can lead to the development of a mic ro-scale sensor overcoming a previously-insurmountable size constraint. Sec ond\, we will discuss how the application of advanced materials can help gr eatly enhance the performance of acoustic sensors. Graphene is believed to be one of the strongest materials and the thinnest film in the universe. We will show how the unique mechanical properties can be applied in the devel opment of miniature acoustic pressure sensors for achieving unprecedentedly high sensitivity\, large bandwidth\, and large dynamic range. Further\, we will show how to use acoustic metamaterials to manipulate acoustic waves a t subwavelength scales. This enables a sensing paradigm that can help overc ome the fundamental detection limit of conventional acoustic pressure senso rs.\n\n\nNotes: For guests attending the LPS seminar\, please use the phone on the left hand side of the front door to call the receptionist for entry . LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Ap ts. LAST-MODIFIED:20150227T160401Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151014T193000Z DTEND:20151014T203000Z DTSTAMP:20260828T094430Z UID:tq7tqr05a2133j5mkcqqvdr3io@google.com CREATED:20151009T185107Z DESCRIPTION:Title : Controlling Neutron Orbital Angular Momentum\nSpeaker N ame: Dr. Charles W. Clark\nSpeaker Institution : NIST (JQI)\nAbstract : Qua ntized orbital angular momentum (OAM) of waves and particles offers an addi tional degree of freedom and topological protection from noise.\nOAM states of photons have been exploited in applications ranging from studies of qua ntum entanglement and quantum information science to 30 gigabit/second tele com multiplexing. OAM states of electron beams have been used to rotate nan oparticles and determine the chirality of crystals. OAM states of ultracold atoms are finding applications in the emerging field of atomtronics. OAM c ontrol of neutrons has not previously been achieved. We recently demonstrat ed OAM control of neutrons using macroscopic spiral phase plates that apply a ‘twist’ to an input neutron beam. The twisted neutron beams are analyzed with neutron interferometry. Our techniques\, applied to spatially incoher ent beams\, demonstrate both the addition of quantum angular momenta along the direction of propagation\, effected by multiple spiral phase plates\, a nd the conservation of topological charge with respect to uniform phase flu ctuations. Neutron-based studies of quantum information science\, the found ations of quantum mechanics\, and scattering and imaging of materials have until now been limited to three degrees of freedom: spin\, path and energy. The optimization of OAM control can provide an additional quantized degree of freedom for such studies.\n\nReferences:\n\n“Controlling neutron orbita l angular momentum\,” C. W. Clark\, et al.\, Nature 525\, 504 (2015)\n“Hyst eresis in a quantized superfluid atomtronic circuit\,” S. Eckel\, et al.\, Nature 506\, 200 (2014) LAST-MODIFIED:20151009T185107Z LOCATION:LPS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150925T170000Z DTEND:20150925T180000Z DTSTAMP:20260828T094430Z UID:vbmmg2a0gauh4cj33bk3oks980@google.com CREATED:20150901T182852Z DESCRIPTION:Title : Grain Boundary and Surface Scattering of Electrons in M etals for Deeply-Scaled Interconnects\nSpeaker Name: Katayun (Katy) Barmak\ ,Columbia University\nAbstract : The classical resistivity size effect\, wh erein conductors with dimensions on the order of the mean free path of elec trons (39 nm for Cu at room temperature) exhibit higher resistivity than bu lk conductors\, was first noted by Thompson in 1901. The importance of the resistivity size effect to Cu interconnects was first identified by Chen an d Gardner of Intel in 1998 and has been of concern to the semiconductor com munity since then. Over the past 100 years\, a number of models that take into account surface scattering\, grain boundary scattering and the effect of surface roughness have been proposed to explain the size effect. The tal k addresses the classical resistivity size effect in interconnect metals an d presents our work on understanding and quantifying the contributions of g rain boundary and surface scattering to the observed resistivity increase. Experimental studies of both Cu and W films will be described\, including t he development of improved metrology techniques for nanoscale metals charac terization that employ crystal orientation mapping in the transmission elec tron microscope. The extent to which semiclassical models of surface and gr ain boundary scattering mechanisms can be used to describe the experimental results will also be discussed. LAST-MODIFIED:20150901T182852Z LOCATION:Room 2108 Chemical & Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141105T150000Z DTEND:20141105T160000Z DTSTAMP:20260828T094430Z UID:4ivscl0qmfsp1s7amk811f75m8@google.com CREATED:20141023T175843Z DESCRIPTION:Speaker Name: Steven Kivelson (Stanford)\n\nTitle: Theory of Intertwined Orders in High Temperature Superconductors\n\nAbstract: The el ectronic phase diagrams of many highly correlated systems\, and in particul ar the cuprate high temperature superconductors\, are complex\, with many d ifferent phases appearing with similar - sometimes identical - ordering tem peratures even as material properties\, such as a dopant concentration\, ar e varied over wide ranges. This complexity is sometimes referred to as "com peting orders." However\, since the relation is intimate\, and can even lea d to the existence of new phases of matter such as the putative "pair-densi ty-wave\," the general relation is better thought of in terms of "intertwin ed orders." We selectively analyze some of the experiments in the cuprates which suggest that essential aspects of the physics are reflected in the in tertwining of multiple orders-not just in the nature of each order by itsel f. We also summarize and critique several theoretical ideas concerning the origin and implications of this complexity.\n\nHost: Jay D. Sau\n\nhttp:// www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20141023T175843Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140815T190000Z DTEND:20140815T210000Z DTSTAMP:20260828T094430Z UID:ka07qs1tmgv8s6g22g6lh13tpk@google.com CREATED:20140813T133840Z DESCRIPTION:Notice of Doctoral Defense for Crystal Senko\n\nDissertation Ti tle: "Dynamics and Excited States in a Quantum Many-Body Spin System of Tr apped Ions"\n\nDissertation Committee Chair: Prof. Christopher Monroe\n\n\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2F sZW5kYXIuZ29vZ2xlLmNvbQ.ka07qs1tmgv8s6g22g6lh13tpk&hs=121 LAST-MODIFIED:20140813T140517Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160225T203000Z DTEND:20160225T220000Z DTSTAMP:20260828T094430Z UID:hbavk4jhq2cjqdft1a9ahvapuc@google.com CREATED:20160218T191518Z DESCRIPTION:Speaker: Chuck Doran (Alberta and UMCP) - \n LAST-MODIFIED:20160218T191518Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mirror symmetry (cont.) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150331T171500Z DTEND:20150331T181500Z DTSTAMP:20260828T094430Z UID:pd9ucgnfs5q69qkkn8prd6rr5g@google.com CREATED:20150324T142622Z DESCRIPTION:Speaker Name: Zhixin Lu\n\nSpeaker Institution : UMCP\n\nTitle : Can Topologically Forbidden Interchange of Energy Surfaces Occur Under Sl ow Variation of a Hamiltonian?\n\nAbstract : I will talk about a particular type of one-degree-of-freedom\, slowly changing\, temporally periodic Hami ltonian system whose numerical simulation shows an apparent paradox. Specif ically\, we sprinkle many initial conditions (particles) on two constant en ergy phase space curves H=EA and H=EB. The H=EA curve encircles the H=EB cu rve. We then numerically follow their orbits forward in time by one cycle p eriod. With large enough cycle period\, at the end of the cycle\, points in itially on the curves H=EA and H=EB now appear to lie on two new constant e nergy curves H=EA′ and H=EB′ where the H=EB′ encircles the H=EA′ curve (as opposed to the initial case where the H=EA curve encircles the H=EB curve). Due to the uniqueness of the Hamiltonian dynamics\, however\, curves evolv ed under the dynamics cannot cross each other. This apparent paradox is res olved and its consequence is studied. I will also talk about how a very tin y amount of friction can have a major consequence\, as well as what happens when a very large number of cycles is followed. I will also discuss how th is phenomenon might extend to chaotic motion in higher dimensional Hamilton ian systems. LAST-MODIFIED:20150324T142622Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150514T163000Z DTEND:20150514T173000Z DTSTAMP:20260828T094430Z UID:jfqhvth1196ku2g2krelhq7hmc@google.com CREATED:20150507T144950Z DESCRIPTION:Speaker Name: Prof. Charles Meneavu \n\nSpeaker Institution : J ohns Hopkins University\n\nTitle : Finite time Lyapunov exponents and gradi ent statistics in fluid turbulence \n\nAbstract : The presentation will bri efly review a Lagrangian model for deforming droplets in turbulence\, in wh ich the cumulative deformation of fluid elements at small scales is crucial . In particular\, we show how knowledge about the statistical distribution of finite-time Lyapunov exponents (FTLEs) can be used to find a critical Ca pillary number above which droplets will break up. Probability distribution functions of droplet sizes show power-law tails and diverging moments. Ins pired by these connections between turbulent phenomena and Lyapunov exponen ts\, we embark on a more systematic study of finite-time Lyapunov exponents in isotropic turbulence. A quantitative statistical characterization of FT LEs can be accomplished using the statistical theory of large deviations\, based on the so-called Cramer function. To obtain the Cramer function from data\, we use both the method based on measuring moments and measuring hist ograms\, and introduce a finite-size correction to the histogram-based meth od. We generalize the existing univariate formalism to the joint distributi ons of the two independent FTLEs in 3D flows. The joint Cramer function of turbulence is measured from two direct numerical simulation datasets of iso tropic turbulence. The results serve to characterize the fundamental statis tical and geometric structure of turbulence at small scales including cumul ative\, time integrated effects. These are important for deformable particl es such as droplets and polymers advected by turbulence (work done in colla boration with PhD student Perry Johnson\, and Profs. L. Biferale and R. Ver zicco). \n\n \n LAST-MODIFIED:20150507T144950Z LOCATION:IREAP Conference Room\, Energy Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121207T180000Z DTEND:20121207T190000Z DTSTAMP:20260828T094430Z UID:d9ou08cqa6srbj9780dkr77008@google.com CREATED:20120731T133225Z DESCRIPTION:Title : Using Interfacial Manipulations to Generate Functional Materials from Nanostructured Polymers\n\nSpeaker Name: Thomas H. Epps\, II I\n\nSpeaker Institution : University of Delaware\n\nNotes: This is a Mater ials Science and Engineering Seminar.\n\nAbstract : As future technological progress necessitates the design and control of nanoscale devices\, new me thods for the facile creation of smaller features must be discovered. One sub-class of soft material\, block copolymers\, provides the opportunity to design materials with attractive chemical and mechanical properties based on the ability to assemble into periodic structures with nanoscale domain s pacings. To employ block copolymers in many applications\, it is essential to understand how interfacial energetics influence copolymer morphologies. Two areas of recent research in the group involve: (1) probing the effect s of interfacial composition on block copolymer self-assembly using tapered block copolymers\, and (2) generating gradient substrate and “free” surfac es for thin films block copolymer studies. In the first area\, we are mani pulating the interfacial region between blocks to control ordering transiti ons in tapered diblock copolymers and triblock copolymers.\n This ability to adjust copolymer energetics allows us to generate nanoscale networks for applications ranging from analytical separation membranes to ion-conductin g materials. In the second area\, we are manipulating polymer thin film in terfacial interactions using discrete gradient methods to control the free surface interactions\, and gradient arrays of assembled monolayers to influ ence the substrate surface interactions. In particular\, our chlorosilane monolayer gradients and solvent vapor gradients permit rapid screening of t he surface/polymer interactions necessary to induce the desired nanostructu re orientations in many block copolymer systems. LAST-MODIFIED:20120731T133233Z LOCATION:Location: Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150429T193000Z DTEND:20150429T203000Z DTSTAMP:20260828T094430Z UID:cqjtid426basvf9mb58njikuts@google.com CREATED:20150423T143227Z DESCRIPTION:Speaker Name: Dr. Verne L. Jacobs\n\nSpeaker Institution: Naval Research Laboratory\n\nTitle : Classical\, Semi-Classical\, and Quantum-Fi eld Descriptions for Light-Matter Interactions \n\nAbstract: Classical\, s emi-classical\, and quantum-field descriptions for the interaction of light with matter are systematically discussed. The primary applications of inte rest include the precise determination of the linear and the non-linear ele ctromagnetic response relevant to resonant pump-probe optical phenomena\, s uch as electromagnetically induced transparency. In the quantum-mechanical description of matter systems\, we introduce a general reduced-density-matr ix framework. The time-domain (equation-of-motion) and frequency-domain (re solvent-operator) formulations are developed in a unified and self-consiste nt manner\, using a Liouville-space operator formalism. A preliminary semi- classical perturbation treatment of the electromagnetic interaction is adop ted\, in which the electromagnetic field is described as a classical field satisfying the Maxwell equations. It is emphasized that a quantized-field a pproach is essential for a fully self-consistent quantum-mechanical formula tion.\n Compact Liouville-space operator expressions are derived for the linear and general (n'th order) non-linear electromagnetic-response tensors describing moving many-electron atomic systems. The tetradic matrix elemen ts of the Liouville-space self-energy operators are evaluated for environme ntal collisional and radiative interactions to provide explicit forms for t he kinetic equations and the spectral line shape formulas. \n Work suppor ted by the Office of Naval Research through the Basic Research Program at T he Naval Research Laboratory.\n LAST-MODIFIED:20150423T150431Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130910T180000Z DTEND:20130910T190000Z DTSTAMP:20260828T094430Z UID:t024k491rsjgchca0o76tt95pg@google.com CREATED:20130906T200231Z DESCRIPTION:Special Materials Seminar: Sanjay V. Khare LAST-MODIFIED:20130906T200358Z LOCATION:Room 1302 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Materials Seminar: Sanjay V. Khare TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141013T190000Z DTEND:20141013T203000Z DTSTAMP:20260828T094430Z UID:epf8c07cmdn7inmpo7esn86q84@google.com CREATED:20140805T172303Z DESCRIPTION:Title: Dynamical Dark Matter: A New Framework for Dark-Matter Physics\n\nSpeaker: Keith Dienes\, University of Arizona\n\nAbstract: In th is talk\, I will provide an introduction to an alternate framework for dark -matter physics which we call "Dynamical Dark Matter" (DDM). Within this f ramework\, the requirement of dark-matter stability is replaced by a balanc ing of lifetimes against cosmological abundances across an ensemble of indi vidual dark-matter components with different masses\, lifetimes\, and abund ances. It is this DDM ensemble which collectively serves as the dark-matt er "candidate" within the DDM framework\, and which collectively carries th e observed dark-matter abundance \\Omega_{CDM}. Likewise\, it is the balan cing between lifetimes and abundances across the ensemble as a whole which ensures the phenomenological viability of the DDM framework --- indeed\, th e usual notion of dark-matter stability is no longer required. As we shall discuss\, this leads to a highly dynamical cosmology in which quantities s uch as Omega_{CDM} experience non-trivial time-dependences beyond those nor mally associated with the expansion of the universe. DDM ensembles arise n aturally in many extensions to the Standard Model\, including string theory and theories with large extra spacetime dimensions. Moreover\, the DDM fr amework can lead to many striking signatures at colliders as well as at dir ect- and indirect-detection dark-matter experiments --- signatures which tr anscend those usually associated with traditional dark-matter candidates. In this talk I shall give a theoretical overview of the DDM framework\, and survey the research which has been done in this field thus far.\n\n[based on 1106.4546\, 1107.0721\, 1203.1923\, 1204.4183\, 1208.0336\, 1306.2959\, 1406.4868\, 1407.2606 ...]\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdl azZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.epf8c07cmdn7inmpo7esn86q 84&hs=121 LAST-MODIFIED:20141009T153048Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150212T173000Z DTEND:20150212T180000Z DTSTAMP:20260828T094430Z UID:at5omrlu3h2tseqv7ctmgt2b9c@google.com CREATED:20150203T214429Z DESCRIPTION:Speaker Name: Aaron Hagerstrom\n\nSpeaker Institution : UMD\n\n Title : Noise\, chaos and entropy production in a photon-counting experimen t\n\n\n\n LAST-MODIFIED:20150203T214429Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140210T213000Z DTEND:20140210T223000Z DTSTAMP:20260828T094430Z UID:vou5dk6m7b7h3s5ss2cfk8fcu4@google.com CREATED:20140206T150620Z DESCRIPTION:Title : Recent status of PandaX experiment\n\nSpeaker Name: Xia ngdong JI\n\nSpeaker Institution : University of Maryland\n\nTitle of Event : Space and Cosmic Ray Physics Seminar\n\nEdits: Title: Recent status of Pa ndaX experiment\nAbstract: The status of a dark matter direct search experi ment using liquid xenon in China Jinping Underground Lab in Sichuan\, China .\n\n LAST-MODIFIED:20140206T150620Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141119T210000Z DTEND:20141119T220000Z DTSTAMP:20260828T094430Z UID:93bm2aemb3qftgkhf47i54qrs8@google.com CREATED:20141113T134648Z DESCRIPTION:Speaker Name: Dr. Obioma Ohia\n\nSpeaker Institution : Universi ty of Maryland\n\nTitle: Two-Fluid Simulations of Magnetic Reconnection wi th a Kinetic Closure\n\nAbstract : Magnetic reconnection is a rapid rearran gement of magnetic line topology in a plasma that can allow magnetic energy to heat\, drive macroscopic flows\, or accelerate particles in space and l aboratory plasmas. Though reconnection affects global plasma dynamics\, it depends intimately on small-scale electron physics. In weakly-collisional p lasmas\, electron pressure anisotropy resulting from the electric and magne tic trapping of electrons strongly affects the structure surrounding the el ectron diffusion region and the electron current layer. Previous fluid mode ls and simulations fail to account for this anisotropy. New equations of st ate that accurately describe the electron pressure anisotropy in cases of s ufficiently strong guide magnetic field have been implemented in fluid simu lations and are compared to previous fluid models and kinetic simulations. Elongated current layers in the reconnection region\, driven\, in part\, by this pressure anisotropy\, appear as part of a self-regulating mechanism o f electron pressure anisotropy. Scaling Laws for properties of the reconnec tion region have been derived using upstream quantities\n\n\nJoin with Goog le Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/plasma- physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ 2xlLmNvbQ.93bm2aemb3qftgkhf47i54qrs8&hs=121 LAST-MODIFIED:20141113T134648Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T200000Z DTEND:20150415T210000Z DTSTAMP:20260828T094430Z UID:7bdc64b75deghvf3o7dn8r3m4c@google.com CREATED:20150408T173537Z DESCRIPTION:Speaker Name: Dr. Elena Provornikova\n\nSpeaker Institution : N ASA Goddard/University of Maryland\n\nTitle : Magnetic reconnection in the solar corona with radiative cooling: How compressive can the reconnection r egions be?\n\nAbstract : Recent simplified analytical studies suggested tha t ions can be accelerated by the first Order Fermi acceleration when intera cting with convergent magnetized flows incoming to the reconnection site. B ouncing back and forth between the converging flows a particle may gain suf ficient energy. Analytical studies showed that the spectral index of partic le energy distribution depends on the compression ratio in the reconnection region similar to the case of shock acceleration. Therefore reconnection m ay produce a hard spectrum of energetic particles if sufficiently high dens ity compression can be achieved. I will present our recent efforts in 2D re sistive MHD modeling of reconnection regions aiming to search for condition s where high compressive current layers may form in the solar corona. We co nsider various magnetic configurations and plasma parametric regimes applic able for the solar corona plasma. Simulations are performed using the HiFi modeling framework with different descriptions of energy balance in the sys tem. These include isothermal and adiabatic approaches and full separate en ergy equations for electrons and ions with energy conversion and transport effects due to ohmic heating\, viscosity and thermal conduction. We impleme nt radiative cooling into the model and study the effect of this process on the plasma compression in reconnecting layer. LAST-MODIFIED:20150408T173658Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151103T160000Z DTEND:20151103T173000Z DTSTAMP:20260828T094430Z UID:h6iv3b8mlgehbd5nlvi9pfeqc0@google.com CREATED:20151014T160959Z DESCRIPTION:Speaker Name: Arun Paramekanti \n\nSpeaker Institution: Univer sity of Toronto\n\nTitle: Band topology meets correlations - from oxides to cold atoms\n\nAbstract: Band topology plays an important role in such unu sual phases as topological insulators and semimetals. This talk will discus s the interplay of band topology and correlation effects in different syste ms. I will argue based on model Hamiltonians and ab initio calculations tha t double perovskites with strong spin-orbit coupling and high Tc ferromagne tism could host Chern bands and regimes of C=2 quantum anomalous Hall insul ator (QAHI) phases in [111] thin film geometries. I will then consider mode ls of phase transitions from QAHI to ordinary insulators\, which involve qu adratic band touching\, and show that interactions drive an emergent dome o f nematic order at such topological critical points. Finally\, I will consi der interaction effects in the Haldane model of a QAHI. We will see that th e Mott insulating regime realizes a chiral spin liquid with gapped semions\ , and discuss the Chern-Simons-Higgs theory of transitions out of this liqu id.\n\nHost: Will Cole\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151030T185528Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150930T200000Z DTEND:20150930T210000Z DTSTAMP:20260828T094430Z UID:3a174ano9c434d0hsch47ajauc@google.com CREATED:20150924T152054Z DESCRIPTION:Wednesday\, September 30th\, 4pm\n\nBrian Hamilton\, University of Maryland\n\n“Measurement of the Semitauonic decay B->D tau nu at LHCb”\ n\n"Semileptonic $b$ decays to tau leptons provide a powerful probe for \nv iolations of charged lepton universality due to physics beyond the \nstanda rd model. In particular\, new particles with Higgs-like enhanced \ncoupling s to the third generation fermions may induce large deviations \nfrom the w ell-understood standard model expectations. The decay rates \nfor these pro cesses remain poorly measured compared to the corresponding \nprocesses inv olving the light leptons\, and tantalizing but inconclusive \nhints of a de viation from the Standard Model have been reported. A new \nmeasurement of the ratio of branching fractions \n$\\mathcal{R}(D^{*})=\\mathcal{B}(\\over line{B}^0 \\to \nD^{*+}\\tau^{-}\\overline{\\nu}_{\\tau})/\\mathcal{B}(\\ov erline{B}^0 \\to \nD^{*+}\\mu^{-}\\overline{\\nu}_{\\mu})$ using the LHCb R un 1 dataset is \npresented\, where the tau is selected in the $\\tau^{-} \ \to \n\\mu^{-}\\overline{\\nu}_\\tau\\nu_\\mu$ decay mode. This is the firs t \nmeasurement of a $b\\to X \\tau\\nu$ process at a hadron collider." LAST-MODIFIED:20150924T205527Z LOCATION:3150 PSC SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131003T173000Z DTEND:20131003T180000Z DTSTAMP:20260828T094430Z UID:mu63qstr480g94u20sjk3m031o@google.com CREATED:20130926T214709Z LAST-MODIFIED:20130926T214731Z LOCATION:Phys. Rm 1305F\; the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151019T200000Z DTEND:20151019T210000Z DTSTAMP:20260828T094430Z UID:ngeven3dfh9gnqclfdule7flec@google.com CREATED:20151006T161323Z DESCRIPTION:Remote Detection via Quantum Coherence\nProfessor Marlan O. Scu lly\nBaylor\, Princeton\, and Texas A&M Universities\nAbstract: There is no thing so practical as a good theory. As a case in point\, the compelling ne ed for standoff detection of hazardous gases and vapor indicators of explos ives has motivated the development of remotely pumped schemes that produce radiation in the backward direction. Moving from conceptualization to theor etical analysis and experimental verification\, we demonstrate that high ga in can be achieved in air. Backward air lasing provides possibilities for r emote detection\, as will be discussed. LAST-MODIFIED:20151014T164328Z LOCATION:1101 Biosciences Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Paint Branch Distinguished Lecture in Applied Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120224T160000Z DTEND:20120224T170000Z DTSTAMP:20260828T094430Z UID:c86u7ahp2nbnksal3ijsnabnvk@google.com CREATED:20120217T150402Z DESCRIPTION:Bioengineering Seminar Series: Harry Bermudez LAST-MODIFIED:20120217T150413Z LOCATION:Room 1200 Jeong H. Kim Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bioengineering Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150212T203000Z DTEND:20150212T213000Z DTSTAMP:20260828T094430Z UID:edpetmonoagfd9oj4s7kkg94vo@google.com CREATED:20150206T140509Z DESCRIPTION:Speaker: Matt Calkins\nAbstract: Further discussion of Lott's p aper "The Geometry of Supergravity Torsion Constraints"\, arXiv:math/01081 25\, focusing on specific examples: U(n) structures and supergravity in 3D. LAST-MODIFIED:20150206T140509Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lott's paper on torsion constraints\, part 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150317T150000Z DTEND:20150317T163000Z DTSTAMP:20260828T094430Z UID:5j1udalgiqabptv1174lb9l2hg@google.com CREATED:20150224T215434Z DESCRIPTION:Speaker: David Abergel (Nordita)\n\nTitle: Tunneling conductanc e in strongly correlated materials.\n\nAbstract: Tunneling conductance meas urements such as two-terminal transport and scanning tunneling microscopy a re important tools for the characterization of condensed matter systems. Ho wever\, for strongly correlated materials\, the tunneling mechanism has not yet been theoretically reproduced or adequately explained. This is because the combination of strong electron-electron interactions and the non-equil ibrium nature of the problem is poorly understood. In this talk\, we show t hat a new theory for the tunneling conductance for strongly correlated syst ems can reproduce all the features of experimental data for many different materials\, and show explicit comparisons for a wide variety of materials. In particular\, our theory gives a quantitative fit and a qualitative expla nation for the side peaks which are present in many different experimental data\, but which are not explained by any prior theory.\n\nHost: Jay Sau\n\ nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150224T215434Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141014T200000Z DTEND:20141014T210000Z DTSTAMP:20260828T094430Z UID:p0qm0du144uhipsj9lgo26pfhs@google.com CREATED:20140718T150242Z DESCRIPTION:Speaker Name: Klaus Von Klitzing\n\nSpeaker Institution: Max- Planck-Institut\n\nTitle: A New Kilogram in 2018\n\nAbstract: The quanti zed Hall resistance (Nobel Prize 1985) plays a crucial role for the impleme ntation of a new international system of units (SI units) since this quantu m resistance can be used not only for high precision realizations of electr ical standards on the basis of fundamental constants but also for a new rea lization of a kilogram by comparing electrical and mechanical forces with t he Watt balance. \nThe talk gives an overview about the development of our present SI system and summarizes the application of the quantum Hall effec t in metrology (science of measurements) with the focus on the replacement of the kilogram by a fixed value for the Planck constant.\n\n\n\n\n\n\n\n\n \nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics .umd.edu/prange-prize?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2F sZW5kYXIuZ29vZ2xlLmNvbQ.p0qm0du144uhipsj9lgo26pfhs&hs=121 LAST-MODIFIED:20141010T202524Z LOCATION:Physics Toll Bldg. 412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150420T203000Z DTEND:20150420T213000Z DTSTAMP:20260828T094430Z UID:flcdqm9g38m8rddt1gb6boj594@google.com CREATED:20150416T130612Z DESCRIPTION:Speaker Name: Douglas P. Hamilton\n\nSpeaker Institution : Dept . of Astronomy\, University of Maryland\n\nTitle : The Origin of Titan and Hyperion\n\nAbstract : Titan is arguably the Solar System's most unusual sa tellite. It is fifty times more massive than Saturn's other moons and is th e only satellite with a substantial atmosphere. Titan shares a unique reson ance with nearby Hyperion\, but otherwise sits in a particularly large gap between Rhea and Iapetus. Titan has the largest eccentricity of all Saturn' s regular satellites and has a reasonably large orbital tilt\; its distant neighbor Iapetus has an even more impressive eight degree free inclination. Hyperion itself is a mystery\, with its unusual orbit\, extremely low dens ity and its unique surface covered with bizarre craters. None of these pecu liarities are even partially understood. Until now!\n\nNotes: Coffee\, Tea\ , and Snacks 4:15-4:30 PM\n\n LAST-MODIFIED:20150416T130612Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160309T190000Z DTEND:20160309T200000Z DTSTAMP:20260828T094430Z UID:ialnsf7cvnqdff9ocgqr3amohg@google.com CLASS:PUBLIC CREATED:20160304T164351Z DESCRIPTION:Speaker Name: Moshe Goldstein\n\nSpeaker Institution: School of Physics and Astronomy\, Tel-Aviv University\, Israel\nTitle: Dissipatio n-induced topological insulators: A recipe\n \nAbstract:It has recently bee n realized that driven-dissipative dynamics\, which usually tends to destro y subtle quantum interference and correlation effects\, could actually be u sed as a resource. By proper engineering of the reservoirs and their coupli ngs\, one may drive a system towards a desired quantum-correlated steady st ate\, even in the absence of internal Hamiltonian dynamics.\nAn intriguing class of quantum phases is characterized by topology\, including the quantu m Hall effect and topological insulators and superconductors. Which of thes e noninteracting topological states can be achieved as the result of purely dissipative Lindblad-type dynamics? Recent studies have only provided part ial answers to this question.\nIn this talk I will present a general recipe for the creation\, classification\, and detection of states of the integer quantum Hall and 2D topological insulator type as the outcomes of coupling a system to reservoirs\, and show how the recipe can be realized with ultr acold atoms and other quantum simulators. The mixed states so created can b e made arbitrarily close to pure states\, and the construction may be gener alized to other topological phases. LAST-MODIFIED:20160308T193349Z LOCATION:PSC 2148 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150311T193000Z DTEND:20150311T203000Z DTSTAMP:20260828T094430Z UID:mf2e6bdle4a1633gksirr6haks@google.com CREATED:20150309T134308Z DESCRIPTION:Speaker Name: Dr. Roberta Rudnick\n\nSpeaker Institution : Cha ir\, Department of Geology\, University of Maryland\, College Park\n\nAbstr act : The Earth is the only planet in our solar system with continents. Con tinents provide the habitat in which our species evolved\, as well as the s ustenance we need to survive. Yet how continents form\, as well as when the y formed\, is still a matter of debate. This lecture will review current th inking on what continents are made of\, and how they may have formed and ev olved through time.\n\nNotes: Please use the phone on the left hand side of the front door to call the receptionist for entry. LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parki ng at the adjacent LTS building but not at the 4H building. LPS is on the U MCP shuttle route\; take #105 for the Courtyard Apts. LAST-MODIFIED:20150309T134308Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150821T150000Z DTEND:20150821T160000Z DTSTAMP:20260828T094430Z UID:i88udhgdn6o5js86tatun4o4ko@google.com CREATED:20150819T174029Z DESCRIPTION:New Electrode Materials for Stationary Sodium-Ion Batteries:\nW ith the tremendous development of renewable energies such as solar and wind powers\, the smooth integration of their energies into the grid\, thus imp roving the grid reliability and utilization\, critically needs large-scale energy storage systems with long-life\, high efficiency\, high safety and l ow cost. Among the various energy storage technologies\, electrochemical ap proach represents one of the most promising means to store the electricity in large-scale because of the flexibility\, high energy conversion efficien cy and simple maintenance. Due to the highest energy density among practica l rechargeable batteries\, lithium-ion batteries have been widely used in t he portable electronic devices and would undoubtedly be the best choice for the electric vehicles. However\, the rarity and non-uniform distribution o f lithium in the Earth’s crust may limit their large-scale application in r enewable energy. In this regard\, room-temperature sodium-ion batteries wit h lower energy density compared with lithium-ion batteries have been recons idered particularly for such large-scale applications\, where cycle life an d cost are more essential factors than energy density owing to the abundant sodium resources (2.75%) and potentially low cost as well as similar “rock ing-chair” sodium storage mechanism as lithium.\n\nIn this presentation\, I will present several layer- and tunnel-type transition metal oxide electro des for room-temperature stationary sodium-ion batteries. In the case of la yer-type metal oxides\, based on our new significant finding of highly elec trochemical reversibility of Cu2+/Cu3+ redox couple in Na-containing layere d oxides\, I will emphasize our recent work on a series of air-stable and C o/Ni-free layered metal oxide cathodes which exhibit superior Na storage pe rformance. The prototype sodium-ion batteries constructed from our develope d cathode and anode materials will also be demonstrated to have promising p ractical application. Furthermore\, we recently propose a new strategy thro ugh partially/fully substituting the redox couple of existing anodes in the ir reduced forms to design the corresponding new cathode materials. The pow er of this strategy was demonstrated through the successful design of new t unnel-type cathode materials of Na0.61[Mn0.61-xFexTi0.39]O2 which exhibit r emarkably improved electrochemical performance compared with Na0.44MnO2. Th is new strategy would open an exciting route to explore electrode materials for rechargeable batteries.\n\nAbout the Speaker\nYong-Sheng Hu is a profe ssor at the Institute of Physics\, Chinese Academy of Sciences (IOP-CAS). H e received his Ph.D. in Condensed Matter Physics from IOP-CAS with Prof. Li quan Chen in 2004\, and then moved to Max Planck Institute for Solid State Research as Postdoctor and Principal researcher. After a short stay at the University of California at Santa Barbara\, he joined IOP-CAS in 2008 and i s working on advanced materials and technologies for long-life grid-scale s tationary batteries\, particularly focusing on sodium based rechargeable ba tteries. He has published over 120 internationally refereed SCI publication s including Journals such as Nature Mater.\, Nature Commun.\, Science Adv.\ , Adv. Mater.\, Adv. Energy Mater.\, Angew. Chem.\, Energy Environ. Sci.\, Nano Letters\, etc. These papers have been cited over 7000 times according to ISI web of science with an H-index of 43. He was selected as a Thomson R euters Highly Cited Researchers in the field of Materials Science in 2014. He received several awards and fellowships for his research work such as\, the “Chinese Society of Electrochemical Prize for Young Scientists” (2013)\ , the “Chinese Society of Ceramic Prize for Young Scientists” (2013)\, the Excellent Award for “One Hundred Talent Project” of CAS (2014)\, Tajima Pri ze (2015)\, Newton Advanced Fellowships (2015)\, Fellow of The Royal Societ y of Chemistry (2015)\, etc. LAST-MODIFIED:20150819T174224Z LOCATION:Room 2118\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Special Seminar: Yong-Sheng Hu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140217T200000Z DTEND:20140217T210000Z DTSTAMP:20260828T094430Z UID:21874dhvc623867nrftkprkeno@google.com CREATED:20140205T173404Z DESCRIPTION:Title: New Signs of Naturalness \n\nSpeaker: Nathaniel Craig\, Rutgers\n\nAbstract: The discovery of a Standard Model-like Higgs heightens the urgency of the electroweak hierarchy problem\, but the first run of th e LHC has yielded no compelling evidence for conventional signs of naturaln ess. In this talk I'll discuss viable models based on the mirror twin Higgs with radically different signatures of naturalness\, as well as new strate gies to discover them.\n LAST-MODIFIED:20140217T140540Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150217T181500Z DTEND:20150217T193000Z DTSTAMP:20260828T094430Z UID:1u0sceglrpfht2gru80okno794@google.com CREATED:20150210T212009Z DESCRIPTION:Speaker Name: Dr. David Limmer\n\nSpeaker Institution : Princet on University\n\nTitle : Unbounded Capacitance at Ionic Liquid-Metal Interf aces\n\nAbtract: Using a combination of molecular dynamics simulations\, c oarse-grain modeling and theoretical arguments\, we show that the different ial capacitance of a model ionic liquid based double-layer capacitor exhibi ts an anomalous dependence on the applied electrical potential. Such behavi or is qualitatively incompatible with standard mean-field theories of the e lectrical double layer\, but is consistent with observations made in experi ment. The anomalous response results from structural changes induced in the interfacial region of the ionic liquid as it develops a charge density to screen the charge induced on the electrode surface. These structural change s are strongly influenced by the out-of-plane layering of the electrolyte a nd are multifaceted\, including an abrupt local ordering of the ions adsorb ed in the plane of the electrode surface. A minimal hamiltonian based on co ulomb frustrated phase separation suggests that this transition is an examp le of a fluctuation induced first order transition at the electrode surface .\n LAST-MODIFIED:20150210T212009Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140204T160000Z DTEND:20140204T173000Z DTSTAMP:20260828T094430Z UID:p14ieapjql94tsmf43pon87kq0@google.com CREATED:20140114T154737Z DESCRIPTION:Speaker: R. Loganayagam (Institute for Advanced Study\, Prince ton\, NJ)\n\nTitle: Thermal anomaly polynomial - curious structures in anom aly induced transport\n\nAbstract: In this talk\, I plan to review some of the recent advances in anomaly induced transport processes with a focus on the relation between Lorentz anomalies and thermal transport. The focus wil l be on an interesting observable called `thermal helicity' (see below).\n\ nConsider a relativistic field theory living in even spacetime dimensions d =2n. Let J_{ab} be the angular momentum in the ab-plane and P_a be the line ar momentum along a-direction. Thermal helicity is then defined as the aver age value of the product\n< J_{12} J_{34} J_{56} ...... J_{2n-3\,2n-2} P_{2 n-1} > where <..> denotes average taken in a thermal ensemble with temperat ure T and chemical potential \\mu. For example\, in 3 spatial dimensions\, thermal helicity is given by < J_{xy} P_z >. = < J_z P_z >.\n\nRecently it has been realized that thermal helicity is always a homogeneous polynomial in temperature T and chemical potential \\mu. This polynomial is in turn re lated simply to the anomaly polynomial of the system under question. This s tatement can be thought of as a generalization of chiral part of Cardy form ula in 2d CFTs.\n\nI will sketch a recent field theory proof of this statem ent given in [arXiv:1311.2935].\n\n\nHost: Sriram Ganeshan\n\nhttp://www.p hysics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140201T132340Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151111T170000Z DTEND:20151111T180000Z DTSTAMP:20260828T094430Z UID:lp49p7ht0htj194aevo5udc5ko@google.com CREATED:20151109T144000Z DESCRIPTION:Speaker Name: Lara Pierpoint\n\nSpeaker Institution : U.S. Depa rtment of Energy\n\nNotes: Join Women in Physics at UMD for a discussion wi th Lara Pierpoint from the U.S. Department of Energy. Please RSVP on Facebo ok or by e-mailing WiP@physics.umd.edu to help us order food for the provid ed lunch.\n\nAs always\, our events are open to everyone -- undergraduates\ , grad students\, postdocs\, faculty and staff. Of course\, this includes p eople of all genders.\n LAST-MODIFIED:20151109T144423Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:WiP Professional Development Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141117T210000Z DTEND:20141117T220000Z DTSTAMP:20260828T094430Z UID:veb5lsk3akcbp4ak523390nr2s@google.com CREATED:20141117T143157Z DESCRIPTION:Speaker Name: Ken Dill\n\nSpeaker Institution : Stony Brook Uni versity\n\nTitle: Cellular growth laws are rooted in proteome physics\n\nA bstract : imple cells like bacteria are mostly protein. So\, it is reasona ble to expect that some physical behaviors of cells are attributable to the properties of their proteome\, the collection of all of a cell’s proteins. We explore how cellular growth rates depend on physical properties. For example\, why cells are so sensitive to temperature? Why are cells so dens ely packed with proteins? How does oxidation\, which causes increasing cel l damage with age\, affect the proteome? Why can’t bacteria duplicate in less than about 20 minutes? And\, what evolutionary factors matter for a c ell’s energy balance?\n\n\n\n\n\nJoin with Google Hangouts: https://hangout s.google.com/hangouts/_/physics.umd.edu/biophysics?hceid=bGJrNjYwYTc1YjhqaD dlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.veb5lsk3akcbp4ak523390 nr2s&hs=121 LAST-MODIFIED:20141117T143157Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150203T181500Z DTEND:20150203T193000Z DTSTAMP:20260828T094430Z UID:jkemrh85p6l501u3p9knjhkb3g@google.com CREATED:20150128T180309Z DESCRIPTION:Speaker Name: Mohammad Hafezi\n\nSpeaker Institution: UMD\n\nTi tle: Engineering thermalization and chemical potential for photons\n\nAbst ract: Photons are not conserved in interactions with other matter. Consequ ently\, when understanding the equation of state and thermodynamics of phot ons\, while we have a concept of temperature for energy conservation\, ther e is no equivalent chemical potential for particle number conservation. How ever\, the notion of a chemical potential is crucial in understanding a wid e variety of single- and many-body effects\, from transport in conductors a nd semi-conductors to phase transitions in electronic and atomic systems. H ere we show how a direct modification of the system-bath coupling via param etric oscillation creates an effective chemical potential for photons even in the thermodynamic limit. Specific implementations\, using circuit-QED or optomechanics\, are feasible using current technologies\, and we show a de tailed example demonstrating the emergence of Mott Insulator-superfluid tra nsition in a lattice of nonlinear oscillators. Our approach paves the way f or quantum simulation\, quantum sources and even electron-like circuits wit h light.\n LAST-MODIFIED:20150130T215339Z LOCATION:Room 1116 IPST Building (Bldg. 85) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141212T170000Z DTEND:20141212T173000Z DTSTAMP:20260828T094430Z UID:i9cd2qkf0tkbu5u7ruvdihbatk@google.com CREATED:20141209T192134Z DESCRIPTION:Time: Dec 12 2014\, 12:00pm - 12:30pm\n\nLocation: PSC 2136\n\n Speaker: Michael Foss-Feig\, JQI\n\nTitle: "Spreading of entanglement in A MO systems"\n\nAbstract: In condensed matter physics\, it is almost always OK to assume that interactions between particles are short-ranged. And\, t hanks to pioneering work by Lieb and Robinson over four decades ago\, we kn ow that this form of locality places strong constraints on the dynamical gr owth of entanglement in many-body quantum systems\, giving rise to a so-cal led "light cone". However\, the exploration of many body physics in atomic \, molecular\, and optical systems\, which typically have long-range intera ctions\, forces us to reexamine this picture. I will discuss our recent pr ogress in understanding the extent to which a "light-cone" (and the many im portant features that follow from it) persist in these long-range interacti ng systems.\n\nJoin with Google Hangouts: https://hangouts.google.com/hango uts/_/physics.umd.edu/khickma1?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3 JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.i9cd2qkf0tkbu5u7ruvdihbatk&hs=121 LAST-MODIFIED:20141211T134140Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Friday Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150323T200000Z DTEND:20150323T210000Z DTSTAMP:20260828T094430Z UID:guvbf6rlreinc9k92bl66ipd5o@google.com CREATED:20150304T210556Z DESCRIPTION:Speaker Name: Lucy Forrest\n\nSpeaker Institution : NIH\n\nTitl e : The elegant role of pseudo-symmetry in transport across membranes\n\nAb stract : Transport of solutes across membranes is carried out by specific t ransport proteins which alternately expose the substrate binding-site to ei ther side of the membrane. X-ray crystallographic data for several secondar y transporters from diverse families support this concept and intriguingly\ , reveal the presence of internal structural repeats with inverted transmem brane topologies. In my talk I will describe work in which we have shown\, using computational modelling of four different secondary transporter famil ies\, that these structural repeats can encode two degenerate conformations of the same protein. These results demonstrate the general role of inverte d-topology repeats ­ and of pseudo-symmetry ­ in the alternating-access mec hanism of secondary transport."\n\n LAST-MODIFIED:20150304T210646Z LOCATION:0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140207T180000Z DTEND:20140207T190000Z DTSTAMP:20260828T094430Z UID:cb9gcd3d0oii8l9rg9ouvovglk@google.com CREATED:20140130T140112Z DESCRIPTION:Title : Bottom-Up Metal Deposition for Feature Filling and Inte rconnect Fabrication\n\nSpeaker Name: Daniel Josell\n\nSpeaker Institution : NIST\n\nNotes: This is a Department of Materials Science and Engineering Seminar.\n\nAbstract : I will describe deposition processes in patterned fe atures such that filling starts towards the feature bottoms with deposition then proceeding upward. The processes\, referred to as “superfill”\, “supe rconformal” or “extreme” bottom-up filling\, permit defect-free and void-fr ee metal filling of high aspect ratio features. Their implementation using copper for sub-micrometer interconnects underlies modern high speed microel ectronics. I will detail superfilling electrodeposition processes for coppe r\, silver\, and gold\, along the way explaining the “Curvature Enhanced Ac celerator Coverage” (CEAC) mechanism that underlies all. My talk will range from noble metals to ferrous metals and from Damascene trenches just tens of nanometers in size to Through Silicon Vias that are tens of micrometers in size. For Through Silicon Vias I will detail the very different process and underlying mechanism. For all I will show how measurements on planar su bstrates yield the information required to quantitatively predict all tempo ral and geometrical aspects of the feature filling. \n\nAbout The Speaker\n \nDr. Josell graduated from Harvard College in 1987 and obtained his Ph.D i n Materials Science in 1992 from Harvard University. He has been a staff me mber of the National Institute of Standards and Technology for 20 years\; h e led the Thin Film and Nanostructure Processing Group from 2005 until 2012 and was Deputy Chief of the Metallurgy Division from 2006 through 2010. H e was the 2011 recipient of the Samuel Wesley Stratton Award\, NIST’s highe st award for scientific achievement\, named after the first director of the Institute (then called the National Bureau of Standards)\, and is also a r ecipient of the highest award of the United States Department of Commerce ( the Gold Medal award) for his research in superfilling processes for fabric ation of damascene interconnects. He has also received the Federal Laborato ry Consortium Award for Excellence in Technology Transfer for work on solde r interconnect geometries.\n\nIn addition to his work on damascene intercon nects in microelectronics\, he has explored the mechanical and thermal tran sport properties of multilayered materials\, the thermodynamics of interfac es\, and the stability of nanoscale materials and structures and materials and processes. For the last several years his work has focused on three-dim ensionally structured photovoltaic devices. He is author of more than one h undred technical publications that are\, together\, cited over 3000 times i n the technical and patent literature and holds a patent related to interco nnect fabrication.\n LAST-MODIFIED:20140130T140112Z LOCATION:Room 2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151021T193000Z DTEND:20151021T203000Z DTSTAMP:20260828T094430Z UID:gk0hskmkbh9r530g2ipdv6qc3g@google.com CREATED:20151019T145134Z DESCRIPTION:Speaker Name: Dr. Rick Silver \n\nSpeaker Institution : Nationa l Institute of Standards and Technology\n\nTitle : Measurement Science for Atomically Precise Manufacturing: Single Atom Transistors to Solid State Qu antum Information Devices \n\nAbstract: Nanoelectronic manufacturing is n ow approaching 10 nm device dimensions. As realistic approaches to manufac ture at the near atomic scale emerge\, new measurement methods are needed t o enable fabrication of traditional devices at the ultimate scaling limits and the new class of emerging quantum information devices. This talk will focus on optical and scanning probe metrology research at NIST intended to span the gap from 10 nm device sizes down to atomically precise manufacturi ng. This recently funded measurement science program\, Atom-based Devices: Single Atom Transistors to Solid State Quantum Computing\, is developing a tom-based Si electronic structures that rely on individual atoms\, each pre cisely placed within a controlled environment. Realizing atomically precis e devices requires capabilities from design and fabrication through electri cal characterization\, device operation and atomistic modelling. The key e nabling fabrication technology is hydrogen-based!\n \nScanning probe litho graphy which enables deterministic placement of individual dopant atoms in the Si lattice. The scope of the talk will include techniques to create lar ge atomically flat terraces\, atomic resolution patterning\, scanning tunne ling spectroscopy\, deterministic dopant placement in a silicon lattice\, l ow temperature epitaxial growth methods\, and techniques to locate and to s ubsequently make contact to atomic scale devices for transport measurements .\n LAST-MODIFIED:20151019T162028Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151022T183000Z DTEND:20151022T193000Z DTSTAMP:20260828T094430Z UID:iq8360ii6hqn415j4muvvolhrg@google.com CREATED:20150914T191033Z DESCRIPTION:Speaker: Yacine Mehtar-Tani\n\nSpeaker Institution: University of Washington\n\nTitle: Nonlocal wave turbulence in non-Abelian plasmas\n\n Abstract: One of the central questions in Heavy Ion physics is how the deco nfined QCD matter produced early in ultra-relativistic Heavy-Ion Collisions (HIC) relaxes to thermal equilibrium. This problem proved to be rich\, inv olving a variety of phenomena such as plasma instabilities\, chaoticity\, t urbulence\, hydrodynamization in strongly/weakly coupled plasmas\, etc. Ho wever\, a complete understanding of non-Abelian plasmas dynamics far from t hermal equilibrium remains to be achieved.\n\nIn classical simulations of a nisotropic non-Abelian plasmas that generate plasma instabilities\, a stati onary power spectrum was observed [1]. This power spectrum was argued to be a result of the turbulent transport of energy from low to large frequencie s due to non-linear gluon interactions. The fitted power\, however\, could not be understood in the standard framework of (weak) wave turbulence theor y which relies on local interactions in momentum space. \n\nIn this work [3 ]\, based on a kinetic approach\, we identify the dominant interactions in non-Abelian plasmas\, namely\, small angle soft gluon absorption\, and argu e that due to non-local interactions in momentum space [2]\, Kolmogorov-Zak harov spectra are not physically relevant. We show in particular how a powe r spectrum with exponent 2 forms when constantly driving the system out of equilibrium by injecting energy at a given frequency called the forcing sca le. This turbulent spectrum corresponds to an energy cascade (characterized by a constant flux) that develops to the right of the forcing scale (towar ds the UV). Remarkably\, to the left of the forcing scale\, soft modes ther malize quickly due to the presence of an essential singularity and a therma l bath forms although the system is out of equilibrium. \n\nAs a consequenc e of non-locality of interactions\, wave turbulence in non-Abelian plasmas exhibits a dual nature and appears to be quite different from Kolmogorov tu rbulence. This preliminary study might help better understand early time th ermalization in Heavy-Ion Collisions.\n\n\nReferences:\n\n[1] P. Arnold and G. D. Moore\, Phys.Rev. D73 (2006) 025006 \n[2] A.H. Mueller\, A.I. Shoshi and S.M.H. Wong\, Nucl. Phys. B760 (2007) 145-165\n[3] Y. Mehtar-Tani\, in preparation LAST-MODIFIED:20151020T132859Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150923T193000Z DTEND:20150923T203000Z DTSTAMP:20260828T094430Z UID:n7odls780s3to83aq5ba2lvq5k@google.com CREATED:20150918T202235Z DESCRIPTION:Title : Exploiting strong physical interactions in silicon pho tonics for security\, communications\, and sensing\nSpeaker Name: Prof. Amy C. Foster\, Electrical and Computer Engineering Department at Johns Hopkin s University\nAbstract : The exceptional confinement of light in silicon ph otonic devices produces physical interactions of an otherwise inaccessible magnitude that can be exploited for a wide range of applications. For examp le\, this talk will discuss the use of optically reverberant chaotic caviti es for passive secure authentication through creation of an ultrafast finge rprint for physical layer security. Additionally\, this talk will discuss h ow the high confinement coupled with a high nonlinearity in the amorphous f orm of silicon enables signal processing at the highest speeds including fu nctions such as amplification\, switching\, and all-optical logic. Lastly\, this talk will discuss the formation of an array of low-loss diffraction-l imited emitters combined with on-chip true time delay to enable rapid spati al optical signal processing. LAST-MODIFIED:20150918T202236Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151026T110000 DTEND;TZID=America/New_York:20151026T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151026T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Christopher Jarzynski\n\nSpeaker Institution: UM D\n\nTitle: Defining work in quantum mechanics: interfering trajectories a nd decohering heat baths\n\nAbstract: The question of how to define the wo rk performed on a quantum system undergoing a thermodynamic process has rec ently received much attention\, particularly in the context of nonequilibri um work relations. For closed quantum systems evolving under time-dependen t Hamiltonians\, a plausible definition of quantum work is provided by the "two-point measurement" (TPM) protocol\, involving projective measurements of the initial and final Hamiltonian. In the first part of my talk\, I wil l show that under this definition the statistical distribution of quantum w ork values can be understood in terms of classical trajectories that interf ere coherently\, via path-integral phases\, and I will extend this result t o describe tunneling into the classically forbidden region. \n\nThe second part of the talk concerns the work performed on a quantum system in the pr esence of a decohering environment\, where the system-environment coupling is sufficient to bring about decoherence but too weak to allow for substant ial energy exchange between system and environment. I will argue that in t his situation the TPM protocol again provides a natural definition of quant um work\, and I will show that nonequilibrium work relations remain valid w ithin this scheme. LAST-MODIFIED:20151022T184247Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150901T150000Z DTEND:20150901T163000Z DTSTAMP:20260828T094430Z UID:ab0abm3tuj0b71siqrfjlool90@google.com CREATED:20150812T161542Z DESCRIPTION:Speaker: David A. Huse (Princeton)\n\nTitle: Many-body localiza tion\n\nAbstract: I will review the present understanding of the many-body localized phase in closed quantum systems\, and of the dynamic quantum phas e transition between it and the thermalizing phase of such systems.\n\nHost : Xiaopeng Li\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150812T161542Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140610T150000Z DTEND:20140610T160000Z DTSTAMP:20260828T094430Z UID:rltc1njfdgfp35gnfne3imiiqc@google.com CREATED:20140609T201345Z DESCRIPTION:Speaker: Petar Jurcevic\, University of Innsbruck\n\nTitle: Ent anglement propagation in long-range Ising spin chains & 20 qubit entangled states.\n\nAbstract: We report on the observation of magnon quasiparticle d ynamics in a one-dimensional many-body quantum system of trapped ions repre senting an Ising spin model. Using the ability to tune the effective intera ction range\, and to prepare and measure the quantum state at the individua l particle level\, we observe new quasiparticle phenomena. For the first ti me\, we reveal the entanglement distributed by quasiparticles around a many -body system. Second\, for long range interactions we observe the divergenc e of quasiparticle velocity and breakdown of the light-cone picture that is valid for short-range interactions. Our results will allow experimental st udies of a wide range of phenomena\, such as quantum transport\, thermaliza tion\, localization and entanglement growth\, and represent a first step to wards a new quantum-optical regime with on-demand quasi-particles with tuna ble non-linear interactions. We also present new results on using these in teractions to generate entangled states with up to 20 spins.\n\nHost: Chris Monroe\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.rltc1njfdgfp35gnfne3imiiqc&hs=121 LAST-MODIFIED:20140609T201345Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150401T200000Z DTEND:20150401T210000Z DTSTAMP:20260828T094430Z UID:m9sr2l88p25cq9jng0phul1l2s@google.com CREATED:20150325T171918Z DESCRIPTION:Speaker Name: Prof. Dennis Whyte\n\nSpeaker Institution : Massa chusetts Institute of Technology\n\nTitle: Smaller & Sooner: Exploiting ne w technologies to accelerate fusion’s development\n\nAbstract: A new gener ation of superconducting (SC) tapes puts within reach loss-free magnetic fi elds with B > 20 Tesla on coil\, doubling the field allowed by the present SC technology. The tapes can also provide demountable SC toroidal field co ils. The ARC FNSF/Pilot design study explores how access to such technolog y would be a “game-changer” for small\, robust tokamak reactors. The B3-4 d ependence in critical fusion parameters allow both high energy gain and pow er density in much smaller devices\, ~ 10x smaller than ITER in volume\, wh ile producing fusion energy ~500 MW and net electricity: features all highl y attractive for the development of fusion energy. ARC operates far from a ll disruptive kink\, pressure\, density and shaping limits. In additions ex cellent access to robust steady-state (SS) scenarios is afforded by high-fi eld\, compact tokamaks. It is shown through simple 1-D analysis and the int roduction of new dimensionless figures of merit that robust SS must arise f rom the combination of high-field and associated improvements in current dr ive at high B\, particularly using integrated high-field Lower Hybrid launc hers. A strong synergy exists between the high-B and demountable coils\, al lowing for simplified and improved fusion engineering choices: immersion li quid blankets\, single-phase high temperature cooling\, and a modular vacuu m vessel\, which becomes the only replacement item in the reactor\, greatly reducing solid waste. The potential wins of high-field SC are so attractiv e that they should be pursued for magnetic fusion’s development.\n LAST-MODIFIED:20150325T172203Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160301T160000Z DTEND:20160301T170000Z DTSTAMP:20260828T094430Z UID:erk8j1m5rkq719o6gq01cspf08@google.com CLASS:PUBLIC CREATED:20160226T125634Z DESCRIPTION:Speaker Name: Sebastian Diehl\n\nSpeaker Institution: Universi ty of Cologne\n\nTitle: Localized Majorana-like modes in a number conservi ng setting: An exactly solvable model\n\nAbstract: We discuss\, in a numbe r conserving framework\, an exactly solvable model of interacting fermions supporting non-local zero-energy Majorana-like edge excitations. The constr uction draws intuition from an approach of targeted dissipative cooling int o topologically non-trivial states. The model has an exactly solvable line\ , on varying the density of fermions\, described by a topologically non-tri vial ground state wave-function. Away from the exactly solvable line we stu dy the system by means of the numerical density matrix renormalization grou p. We characterize its topological properties through the explicit calculat ion of a degenerate entanglement spectrum\, establish the presence of a gap in its single particle spectrum while the Hamiltonian is gapless\, and com pute the correlations between the edge modes as well as the superfluid corr elations. The exactly known ground state wavefunction allows us to construc t analytically number conserving braiding operators\, which are exponential ly localized at the edges. \n*** LAST-MODIFIED:20160226T182808Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150511T200000Z DTEND:20150511T213000Z DTSTAMP:20260828T094430Z UID:ci4s2j2js0veafpb7kn160k6vo@google.com CREATED:20150108T195049Z DESCRIPTION:Speaker Name: Bhupal Dev\n\nSpeaker Institution: University of Manchester\n\nTitle: A Flavor-Covariant Approach to Leptogenesis\n\nAbstrac t: Leptogenesis can be regarded as a cosmological consequence of the seesaw mechanism\, thereby providing an elegant unified framework to account for both the observed matter-antimatter asymmetry in our Universe and the small ness of the light neutrino masses. We will briefly review the key ingredien ts of leptogenesis\, with special emphasis on low-scale leptogenesis models which are testable in foreseeable experiments at energy and intensity fron tiers. We will then discuss some recent theoretical developments to address various subtleties in the calculation of the lepton asymmetry in the fully flavored regime. In particular\, we present a fully flavor-covariant forma lism which consistently captures three physically distinct flavor effects i n the system.\n\nJoin with Google Hangouts: https://hangouts.google.com/han gouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1Z TBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ci4s2j2js0veafpb7kn160k6vo&hs=121 LAST-MODIFIED:20150507T192414Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140410T163000Z DTEND:20140410T173000Z DTSTAMP:20260828T094430Z UID:h5bganvjs2k8avq99bjs6oev4o@google.com CREATED:20140404T132507Z DESCRIPTION:Speaker Name: Dr. Alexandre Morozov\n\nSpeaker Institution : Ru tgers University\n\nTitle : Best strategies for traversing complex landscap es\, or pitfalls of simulated annealing and other "blind" Monte-Carlo techn iques\n\nAbstract : I will describe a novel strategy for Monte Carlo (MC) o ptimization on rugged multidimensional landscapes.\nThe strategy is based o n querying the statistical properties of the landscape in order to find the temperature or set of temperatures which minimize the mean first passage t ime across the landscape. Thus\, in contrast to other MC algorithms such as simulated annealing\, the temperature schedule is explicitly matched to th e statistics of landscape irregularities. In cases where these statistics a re approximately invariant over the entire landscape (e.g. if non-local mov es couple distant parts of the landscape)\, a single-temperature MC scheme outperforms more "advanced" MC algorithms. Furthermore\, we find that in st rongly anisotropic problems such as Coulomb spin glass and traveling salesm an\, the only relevant statistics are those of irregularities in low-energy funnels. Our results are applicable to a wide range of optimization scenar ios in science and engineering\, and may provide insights into efficiency o f protein folding at room temperatures.\n\n LAST-MODIFIED:20140404T133646Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151203T203000Z DTEND:20151203T220000Z DTSTAMP:20260828T094430Z UID:aflbmu62q7ilmhhqm78qdl0ngg@google.com CREATED:20151120T200515Z DESCRIPTION:Speaker Name: Amin Gholampour\, UMd\n LAST-MODIFIED:20151202T191048Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Givental's approach to mirror symmetry (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151013T140000Z DTEND:20151013T170000Z DTSTAMP:20260828T094430Z UID:c5iht56mof7434h1ra1p2br0ds@google.com CREATED:20150921T194123Z DESCRIPTION:Theme: Majorana and Topological Systems\n\n10:00 AM Ching-Kai Chiu "Topological nodal lines"\n\n10:45 AM David Clarke "Bell violation s in Majorana wires"\n\n11:30 AM William Cole "Effects of strong proximit y coupling on semiconductor Majorana nanowires"\n\n12:15 PM Setiawan "Con ductance spectroscopy of topological superconductor wire junctions"\n LAST-MODIFIED:20150921T194123Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151022T180000Z DTEND:20151022T193000Z DTSTAMP:20260828T094430Z UID:vrk4l5u3p9hig8mj5jr93l4q6g@google.com CREATED:20150728T173104Z DESCRIPTION:SPEAKER: Maxim Vavilov\, Wisconsin-Madison\n\nTITLE: Supercond ucting Josephson devices for quantum measurements in electronic circuits\n\ nABSTRACT: Recent experiments revealed the quantum nature of electromagneti c fields of superconducting circuits at microwave frequencies. Individual quanta of these fields are photons with energy a few million times smaller than the energy of an optical photon and are extremely hard to detect. A promising device for microwave photon detection is based on Josephson junc tions. Even a single microwave photon with tiny energy is sufficient to sw itch a junction from the superconducting to voltage state\, and detection o f a photon reduces to observation of voltage pulses across the junction.\nI n this talk\, I will present a theoretical model of a current-bias Josephs on junction interacting with a quantized electromagnetic field and show tha t Josephson photon detectors have relatively high efficiency of detection o f a single microwave photon. I will also describe gain and added noise in SQUID amplifiers by analyzing effect of thermal noise on phase-slips timing .\nI will discuss application of such devices for qubit readout for quantum information processing and to studies of photon emission statistics by qua ntum electronic devices.\n\n\nHOST: Vlad Manucharyan LAST-MODIFIED:20151012T171509Z LOCATION:John S Toll Physics\, Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Maxim Vavilov\, Wisconsin-Madison TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140703T140000Z DTEND:20140703T153000Z DTSTAMP:20260828T094430Z UID:0kpsvkltuvsm59evpu7com1dro@google.com CREATED:20140624T135504Z DESCRIPTION:Title: "Centre Vortex Effects on the Quark Propagator in Lattic e QCD"\n\nSpeaker: Daniel Trewartha\, Adelaide\n\nAbstract: The identity of the fundamental aspects of the QCD vacuum that are responsible for the dyn amical generation of mass through chiral symmetry breaking is an ongoing so urce of debate. We investigate the role of centre vortices\, topological de fects in the gauge field\, using lattice QCD. We study the quark propagator and associated mass function on gauge-field backgrounds featuring the remo val of centre vortices as well as on vortex-only backgrounds\, and present novel results for the dependence of the propagator on the underlying topolo gy of the gauge field.\n\nJoin with Google Hangouts: https://hangouts.googl e.com/hangouts/_/physics.umd.edu/nuclear-physics?hceid=bGJrNjYwYTc1YjhqaDdl azZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.0kpsvkltuvsm59evpu7com1d ro&hs=121 LAST-MODIFIED:20140624T135504Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140905T190000Z DTEND:20140905T200000Z DTSTAMP:20260828T094430Z UID:7smfq10lbnk7a02gh5bem587v8@google.com CREATED:20140826T141335Z DESCRIPTION:Speaker Name: Peter Graham\n\nSpeaker Institution: Stanford Un iversity\n\nTitle: Gravitational Wave Detection with Atom Interferometry\n\ nAbstract: Atom interferometry is an exciting tool for testing gravity and searching for gravitational waves. A new detection strategy based on advan ces in optical atomic clocks and atom interferometry can operate at long-ba selines and provides immunity to laser frequency noise. This new class of sensor allows sensitive gravitational wave detection with only a single bas eline. I will describe our proposals for gravitational wave detection and tests of gravity with atom interferometry\, and discuss recent experimental progress.\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hang outs/_/physics.umd.edu/joint-quantum?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1 ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7smfq10lbnk7a02gh5bem587v8&hs=121 LAST-MODIFIED:20140826T142314Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151005T190000Z DTEND:20151005T203000Z DTSTAMP:20260828T094430Z UID:9ggaj083cop4m3vhclg3bq6ht8@google.com CREATED:20150929T131836Z DESCRIPTION:Speaker: Doojin Kim\n\nSpeaker Institution: University of Flori da\n\nTitle: Energy Peak: Back to Cosmic Ray Excesses\n\nAbstract: It has b een shown that the energy distribution of the massless decay product \nfrom the 2-body decay of a scalar or unpolarized mother particle has a peak\, \ nwhose location is identical to the fixed energy of that particle in the re st frame of the\ncorresponding mother particle although its underlying boos t distribution is unknown. \nIn this talk\, I will discuss how this observa tion can be applied to anomalous excesses\nin cosmic ray measurements\, hav ing dark matter interpretation in mind\, \ntogether with several concrete e xamples such as the Galactic Center GeV excess\, \nline-like gamma-ray exce sses\, and MeV-range gamma-ray signatures under \nthe dynamical dark matter framework. I will also briefly discuss distinctive morphological \nfeature s of the relevant cosmic ray energy spectra\, which can used for unveiling \nthe details of underlying dark matter scenarios. \n\nJoin with Google Han gouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/speaker-tbd?h ceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ .9ggaj083cop4m3vhclg3bq6ht8&hs=121 LAST-MODIFIED:20150929T131836Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141024T170000Z DTEND:20141024T180000Z DTSTAMP:20260828T094430Z UID:n08gdl86vomde79ugg1b2b4g78@google.com CREATED:20141021T201132Z DESCRIPTION:Speaker Name: Albert Davydov\n\nSpeaker Institution : NIST\n\nT itle : Low-Dimensional Semiconductors for Electronics\, Sensors\, and Energ y\n\nAbstract : In addition to conventional thin film structures\, 1D and 2 D nanostructures such as semiconductor nanowires and graphene-like layers h ave attracted considerable attention due to their unique electronic\, magne tic\, optical\, thermal and mechanical properties\, complemented with super ior structural quality and high surface-to-volume ratio. Nanowires and 2D l ayers represent nanoscale building blocks for on-chip integration for optoe lectronic\, sensor\, and energy applications for portable ubiquitous electr onics on flexible platforms.\n\nTo realize new applications\, the controlle d fabrication of nanowires and 2D layers with defined geometries and electr onic properties as well as their integration with planar device structures is required. This talk discusses fabrication and characterization of silico n and gallium nitride nanowire materials and devices\, including single and arrayed nanowire transistors\, chemical and bio- sensors\, Li-ion batterie s\, and LEDs. A special case of developing periodic arrays of vertically al igned GaN core-shell nanostructures for p-i-n photodetectors\, realized wit h a combination of top-down etch and subsequent chemical vapor deposition\, is presented.\n\nThe 2D research is illustrated by fabrication and testing of field-effect-transistors (FETs) composed of monolayer to few-layer MoS2 thin films\, where device transport characteristics are governed by inter- layer coupling and electrically active surface states.\n\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hc eid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ. n08gdl86vomde79ugg1b2b4g78&hs=121 LAST-MODIFIED:20141021T201816Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151109T200000Z DTEND:20151109T213000Z DTSTAMP:20260828T094430Z UID:j7apjtoaaebmu6a3vbnubhqtk4@google.com CREATED:20150721T130752Z DESCRIPTION:Speaker: Elisabetta Furlan\n\nSpeaker Institution: ETH Zurich\n \nTitle: Gluon-Fusion Higgs Production: The Final Frontier\n \nAbstract: Th e gluon-fusion Higgs production cross section has been recently computed\nt hrough the next-to-next-to-next to leading order (N^3LO) in QCD.\nThis unpr ecedented level of accuracy is crucial to exploit fully the LHC data in\nth e validation of the Standard Model and in the search for potential (small)\ ndeviations due to new physics.\nI will give an overview of the tools that we employed to achieve this result\, from\nthe framework of heavy-quark eff ective theories to the analytical and mathematical\nmachinery that we devel oped. I will conclude with some results and future prospects.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/spe aker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29v Z2xlLmNvbQ.j7apjtoaaebmu6a3vbnubhqtk4&hs=121 LAST-MODIFIED:20151104T173852Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120313T130000Z DTEND:20120313T210000Z DTSTAMP:20260828T094430Z UID:96kppo7pv3vnec0cclg77drit4@google.com CREATED:20120209T152344Z DESCRIPTION:Schedule \n9:00 am Introductions\n9:15 am Sean Sun\, Johns H opkins University\,\n "Modeling Cellular Volume and Pressure Regu lation: Implications for Cell Shape and Motility"\n10:00 am Rong Li\, Sto wers Institute\n “Mechanisms of actin-based force generation in ce ll polarity and cell division”.\n10:45 am Break\n11:00 am Thomas Blanpied \, University of Maryland School of Medicine\n “Actin-driven dyn amics of the neuronal postsynaptic density”\n11:45 am Short local talk - - Arpita Upadhyaya\, University of Maryland\, \n “Cytoskele tal dynamics during lymphocyte activation”\n12:05 pm Short local talk -- Dylan Burnette\, NIH \n "How cells crawl: a role for actin arcs in the leading edge advance of migrating cells" \n12:25 pm Lunch B reak\n2:00 pm Short local talk -- Wolfgang Losert\, University of Ma ryland\n "Cell Shape Dynamics: From Waves to Migration"\n2:20 pm Dmitrios Vavylonis\, Lehigh University \n "Excitable Actin Dy namics at the Leading Edge of Crawling Cells"\n3:05 pm Anders Carlsson\ , Washington University\n "Spontaneous Waves and Symmetry Breakin g of F-Actin in Cells"\n3:50 pm Break \n4:15 pm Glenn Edwards\, Du ke University \n “Molecular force production\, cell-shape cha nges\, and tissue patterning during Drosophila \n development ”\n5:00 pm Reception LAST-MODIFIED:20120209T152423Z LOCATION:1103 Biosciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CELL DYNAMICS SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150928T200000Z DTEND:20150928T210000Z DTSTAMP:20260828T094430Z UID:jv3lp4dbiapa087rmntc604280@google.com CREATED:20150923T131753Z DESCRIPTION:Title : Texture sensing mechanisms in neutrophil migration\nSpe aker Name: Satarupa Das\nSpeaker Institution : UMCP\nAbstract: Cell migrati on is essential for numerous physiological and pathological processes\, inc luding embryogenesis\, wound repair\, and metastasis. Although a great deal is known about the fundamental mechanisms of cell migration\, the molecula r mechanisms by which cells integrate signals from their local 3-D environm ent to promote directional migration are not well understood. Here we show that nanotopographies\, which are comparable in size to collagen fibers\, c an influence cell polarity and migration by aligning cytoskeletal structure s and guiding actin waves. Using life-cell labeling of polymerizing actin\, we investigate the biophysical mechanisms underlying this contact guidance in amoeboid migration using HL-60\, a neutrophil-like human cell line. We find that the nanotopography affects cell behavior by nucleating and guidin g polymerization of actin into filament networks. We show that actin netwo rks readily forms near ridges and other textures that are comparable in siz e to collagen fibers. Finally\, we demonstrate that variations in texture allow us to change actin polymerization and cell migration behavior. LAST-MODIFIED:20150925T130336Z LOCATION:Room 0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151202T160000Z DTEND:20151202T170000Z DTSTAMP:20260828T094430Z UID:89o3f07u6nfedon10fqsaj0574@google.com CLASS:PUBLIC CREATED:20151130T132802Z DESCRIPTION:Error correction for quantum annealing\n\nDaniel Lidar (USC)\n\ nJust like all other quantum information processing methods\, quantum\nanne aling requires error correction in order to become scalable. I\nwill report on our progress in developing and analyzing quantum\nannealing correction methods\, and their implementation using the\nD-Wave Two processor at USC. LAST-MODIFIED:20151130T132802Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140910T193000Z DTEND:20140910T203000Z DTSTAMP:20260828T094430Z UID:ib4ca297qpismopvfjfe9smtmk@google.com CREATED:20140902T204033Z DESCRIPTION:Speaker Name: Dr. Omid Noroozian\n\nSpeaker Institution : NASA/ Goddard Space Flight Center\n\nTitle: Submillimeter Spectroscopy with μ-Sp ec\n\nAbstract: At the observational cosmology laboratory at NASA/GSFC we a re developing an extremely compact (~10 cm2) sub-millimeter spectrometer ca lled μ-Spec for application on a space or balloon telescope with resolution R ~ 1500. Orders of magnitude reduction in the mass and volume of our spec trometer is achieved by using superconducting microstrip transmission line technology with single crystal silicon dielectric. An on-chip delay network creates a synthetic grating\, which focuses different wavelengths of light on each of the output sensor channels. The resolution is only limited by t he ultimate loss in the transmission lines. The sensors are superconductin g micro-resonators that are produced by depositing a layer of superconducti ng thin film on a dielectric substrate and patterning with standard lithogr aphic techniques. The sensors are called Microwave Kinetic Inductance Detec tors (MKID) and are very sensitive to perturbations in the surface impedanc e caused by incident photons\, which produce changes in the frequency and q uality factor of the resonance. In order to avoid frequency noise caused by unwanted two-level system defects on the surfaces and at interfaces of the structure the resonators have large parallel-plate capacitors with crystal line silicon dielectric. The kinetic inductor is made from aluminum or a n itride superconductor (e.g. TiN) to increase response to photons. In this p resentation I will describe an overview of the critical components necessar y for the success of μ-Spec. I will then present recent developments and me asurement results on a demonstration μ-Spec with resolution R=64. I will al so describe on-going detector characterization work for our aluminum MKIDs in ultra-low backgrounds conditions.\n\ncontact wijohns@umd.edu for more in formation\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hango uts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jvd XAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ib4ca297qpismopvfjfe9smtmk&hs=121 LAST-MODIFIED:20140908T153826Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Weekly Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140311T171500Z DTEND:20140311T183000Z DTSTAMP:20260828T094430Z UID:0oe3qjfrfn6r8cdcerv37jo4tk@google.com CREATED:20140228T190938Z DESCRIPTION:Speaker Name: Professor Pierre Gaspard\n\nSpeaker Institution : University Libre de Bruxelles\n\nTitle: Thermodynamics Meets Information i n Copolymerization Processes\n\nNotes: As in the past\, each seminar will b e preceded by an Informal Cafeteria Lunch to which all are welcome\, depart ing from room 1108 about five minutes after 12:00 (Noon).\n\nFor further in formation contact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu (301 )405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)405-4802\nProfessor Mi chelle Girvan\, Girvan@umd.edu (301)405-1610\n\n\n LAST-MODIFIED:20140311T181436Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160229T213000Z DTEND:20160229T223000Z DTSTAMP:20260828T094430Z UID:m03gkkgniarc2bsfohgpsromlc@google.com CREATED:20160226T155257Z DESCRIPTION:Speaker Name: Joel C. Rynes\n\nSpeaker Institution : Domestic N uclear Detection Office\, Department of Homeland Security\n\nTitle : Advanc ing Technological Capabilities to Prevent Nuclear Terrorism\n\nAbstract : T he Department of Homeland Security’s Domestic Nuclear Detection Office (DND O) is solely focused on preventing nuclear terrorism through nuclear detect ion and technical nuclear forensics. DNDO’s Transformational and Applied Re search (TAR) Directorate has the mission to develop break-through technolog ies that will have a dramatic impact on capabilities to detect nuclear and radiological threats through an aggressive and expedited research and devel opment (R&D) program. This talk will provide an overview of DNDO and its ap proach to solve the technical grand challenges derived from gaps in the Glo bal Nuclear Detection Architecture (GNDA) and Technical Nuclear Forensics ( TNF). The talk will emphasize emerging technologies to solve these problems as well as remaining technological needs. LAST-MODIFIED:20160226T155357Z LOCATION:Room 2400 CSS Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T190000Z DTEND:20140512T200000Z DTSTAMP:20260828T094430Z UID:loi61kiljkupecgk5bk11gbuj8@google.com CREATED:20140507T154705Z DESCRIPTION:**Please note new location**\n\nSpeaker Name: Patrick Stengel\n \nSpeaker Institution: University of Hawaii\nTitle: Complementary constrai nts on light dark matter from heavy meson decays\n\nAbstract: We investigat e constraints on the properties of light dark matter which can be obtained from analysis of invisible quarkonium decays at high intensity electron-pos itron colliders in the framework of a low energy effective field theory. A matrix element analysis of all interaction structures pertinent for our bou nd state decays allows for a model independent calculation of associated sc attering and annihilation cross sections. Assuming dark matter couples univ ersally to all quark flavors\, we then obtain bounds on nucleon scattering which complement direct dark matter detection searches. In contrast to simi lar analyses of monojet searches at high energy colliders\, B and charm fac tories are more suitable probes of light dark matter interactions with less massive mediators. Relevant bounds on dark matter annihilation from the di ffuse gamma ray background are also presented.\n LAST-MODIFIED:20140509T182137Z LOCATION:PSC 3132 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150205T210000Z DTEND:20150205T220000Z DTSTAMP:20260828T094430Z UID:iig1mvoc3holhro0emtgn3ook0@google.com CREATED:20150126T170449Z DESCRIPTION:Title: The strong CP "problem" and spontaneous CP violation\n\n Speaker: Luca Vecchi\, UMD\n\nAbstract: I discuss CP violation in the stron g sector of the Standard Model and explain to what extent the tiny value of the neutron EDM can be interpreted as a "problem". I review a few attempts to address this issue within new physics models\, and in particular analyz e scenarios based on spontaneous CP violation. LAST-MODIFIED:20150203T161435Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160208T210000Z DTEND:20160208T220000Z DTSTAMP:20260828T094430Z UID:3brk9h1i2p3ijrldmbbvcrg69s@google.com CREATED:20160128T165423Z DESCRIPTION:Speaker Name: Nikta Fahri\n\nSpeaker Institution : MIT\n\nRefre shments served at 3:45pm\n LAST-MODIFIED:20160203T155909Z LOCATION:Marker Seminar room 0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140324T190000Z DTEND:20140324T200000Z DTSTAMP:20260828T094430Z UID:sptnblh175jnjlbsb3c9j10scg@google.com CREATED:20140304T204745Z DESCRIPTION:Title: S-duality of nonsupersymmetric gauge theories\n\nSpeaker : Anson Hook\, Princeton\n\nAbstract: We propose a method for constructing pairs of nonsupersymmetric gauge theories related by S- duality. Starting f rom a known S-duality of supersymmetric theories realized on the worldvolum e of D3 branes in type IIB string theory\, a new duality is obtained by rep lacing the D3-branes with antibranes. Large classes of dual pairs of nonsup ersymmetric theories can be obtained in this way\, with different interacti ons and matter content (chiral and vector-like). The approach is illustrate d on gauge theories realized on three-branes and fractional branes probing orbifold singularities. The duality sheds light on the dynamics of gauge th eories and their possible infrared phases by providing concrete magnetic du al descriptions of strongly coupled theories. Some of the models share vari ous properties with QCD\, including confinement and chiral symmetry breakin g. More generally\, these theories feature fermions in multiple two-index r epresentations and could realize intriguing phases such as a free magnetic phase with chiral symmetry breaking or mixed phases where an interacting fi xed point coexists with a confining phase.\n LAST-MODIFIED:20140310T185034Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150304T210000Z DTEND:20150304T220000Z DTSTAMP:20260828T094430Z UID:jc56mv2pak5tqdd0494seihgus@google.com CREATED:20150226T172244Z DESCRIPTION:Speaker Name: Naoki Bessho\n\nSpeaker Institution : NASA Goddar d/University of Maryland\n\nTitle : Magnetic reconnection and electron phys ics: fine structures in electron distribution functions\n\nAbstract : We in vestigate magnetic reconnection (antiparallel\, symmetric\, without guide f ield) and electron physics by means of two-dimensional particle-in-cell sim ulations. When collisionless reconnection occurs\, an electron-scale thin c urrent layer is formed in the vicinity of an X-line. Around that region is called an electron diffusion region\, where electrons are unmagnetized and energy conversion from magnetic energy to kinetic energy occurs. In an elec tron diffusion region\, electrons meander across the magnetic neutral line during acceleration by the reconnection electric field. At the same time\, a magnetic field normal to the current sheet turns the electron velocity an d a partial gyration occurs. As a result\, electron distribution functions show a variety of fine structures in the electron diffusion region: a trian gular shape with multiple striations at the X-line\, arc and swirling struc tures in the downstream\, and a ring structure near the edge of an electron jet. We traced particle trajectories to identify the origin of those fine structures. Also\, we analytically solve the electron motion in the vicinit y of the X-line\, and obtained formulas for the separation of striations an d a triangular shape of an electron distribution function. Based on a Clust er observation of magnetic reconnection in the Earth's magnetotail\, we pre dict the magnitude of the separation of striations and the length of each s triation in a momentum space of an electron distribution function near the X-line. Our study will guide identification of electron diffusion regions d uring reconnection based on satellite measurements\, such as NASA's upcomin g MMS mission. LAST-MODIFIED:20150226T172426Z LOCATION: ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140513T171500Z DTEND:20140513T183000Z DTSTAMP:20260828T094430Z UID:sck2pai7eu7hrcaiq6vb2nt66g@google.com CREATED:20140428T182922Z DESCRIPTION:Speaker Name: Professor Ted Kirkpatrick\n\nSpeaker Institution : University of Maryland\, College Park\n\nTitle : What's New in Quantum (f erro) Magnetism? LAST-MODIFIED:20140428T182922Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160302T210000Z DTEND:20160302T220000Z DTSTAMP:20260828T094430Z UID:agb7ve57egruba8kdgoqqln7no@google.com CREATED:20160216T185802Z DESCRIPTION:Speaker Name: Kalman Knizhnik\n\nSpeaker Institution : NASA God dard\n\nTitle : The Role of Magnetic Helicity Injection in the Structure an d Heating of the Solar Corona\n\nAbstract : Understanding the structure and heating of the multi-million degree solar corona is one of the most import ant goals for space weather prediction. All coronal heating models require magnetic free energy\, in the form of twist or shear\, to be injected at th e photospheric level\, after which the free energy is converted to heating either through wave damping or magnetic reconnection. In addition to free e nergy\, however\, magnetic helicity must also be injected by the photospher ic motions. Unlike free energy\, the helicity is conserved even under recon nection\, consequently\, magnetic twist is expected to accumulate in the co rona and eventually be observed. However\, observations indicate that the c oronal magnetic field is extremely smooth and highly laminar\, with little\ , if any\, observed twist or tangling. The only location where magnetic hel icity is routinely observed is in filament channels\, the highly sheared ma gnetic structures overlying polarity inversion lines (PILs)! . It follows\, then\, that the helicity injected at the photospheric level must somehow a ccumulate in filament channels. In this talk\, I will describe helicity-con serving numerical simulations that explore the effect of helicity injection into a highly conducting corona. I will describe how helicity is transport ed to photospheric PILs via magnetic reconnection\, in agreement with the h elicity condensation model of Antiochos (2013)\, and how this process is re sponsible for both the formation of filament channels and the observed heat ing of the corona. These simulations investigate the role of the hemispheri c helicity preference in the formation of filament channels and in the heat ing of the corona. The results indicate that understanding and quantifying the magnetic helicity injection into the solar corona is crucial for improv ing our space weather predictive capabilities. LAST-MODIFIED:20160216T185905Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140422T171500Z DTEND:20140422T183000Z DTSTAMP:20260828T094430Z UID:0f0t9sgdsqcea7jdsocfnqlr2c@google.com CREATED:20140414T142300Z DESCRIPTION:Speaker Name: Professor David Levermore\n\nSpeaker Institution : University of Maryland\, College Park\n\nTitle : Modeling Portfolios that Contain Risky Assets.\n\n LAST-MODIFIED:20140414T142300Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151119T190000Z DTEND:20151119T200000Z DTSTAMP:20260828T094430Z UID:veifmaspp3e9i53ov9g86hn6lo@google.com CREATED:20151105T225746Z DESCRIPTION:SPEAKER: Dustin Gilbert\, NCNR\n\nTITLE: Realization of Groun d State Artificial Skyrmion Lattices at Room Temperature\n\nABSTRACT: The unique spin texture in magnetic skyrmions leads to a host of fascinating ph enomena due to the topologically protected quantum state and emergent elect romagnetic field\, offering great potential for novel concepts in low dissi pation magnetic information storage\, or skyrmionics. To date\, the vast ma jority of the magnetic skyrmion phases have been limited to low temperature s and finite magnetic fields. Prerequisite\, however\, for systematic studi es of the unique properties and the technological exploitation of magnetic skyrmions is a ground state which establishes itself at ambient conditions. In this work we present direct experimental evidence of artificial skyrmio n lattices with a stable ground state at room temperature.[1] Our approach is to pattern vortex-state 560 nm nanodots in hexagonal arrays via electron -beam lithography on top of a Co/Pd multilayer with perpendicular magnetic anisotropy\; the skyrmion state is prepared using a specific magnetic field sequence. In particular\, ion irradiation has been employed to suppress PM A in the underlayer and allow imprinting of the vortex structure from the n anodots to form skyrmion lattices\, which is a critical step. Chirality con trol in the Co nanodots is realized through shape asymmetry\, and confirmed by magnetic force microscopy and scanning electron microscopy with polariz ation analysis. The vortex polarity is set by an external magnetic field to be opposite of the underlying Co/Pd film\, and confirmed by magnetometry m easurements. The vortex structure of the Co nanodots is imprinted into the Co/Pd\, as revealed by polarized neutron reflectometry. The imprinted spin structure is shown to only extend as deep as the irradiation damage. The ex istence of the artificial skyrmion lattice is also confirmed by spin-transp ort studies. These artificial lattices offer a convenient platform to explo re skyrmion physics and topological phenomena\, even at room temperature an d in the absence of any magnetic field.\n\nThis work has been supported by the NSF (DMR-1008791 and ECCS-1232275)\, the NRC RAP (DAG)\, and DOE BES MS E Contract No. DE-AC02-05-CH11231 (PF).\n\n[1] D. A. Gilbert et al.\, Natur e Commun. 6\, 8462 (2015)\n \n\nHost: Nick Butch LAST-MODIFIED:20151112T165913Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Dustin Gilbert\, NCNR TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160210T210000Z DTEND:20160210T220000Z DTSTAMP:20260828T094430Z UID:2qi55749lv0u0sc2sqqk6tmi28@google.com CREATED:20160201T201855Z DESCRIPTION:Speaker Name: Prof. Paul Cassak\n\nSpeaker Institution : West V irginia University\n\nTitle : Magnetic reconnection at the dayside magnetop ause\n\nAbstract : Magnetic reconnection at the dayside magnetopause\, the edge of Earth’s magnetosphere on the side closer to the sun\, it is crucial for understanding how the magnetosphere reacts to input from interplanetar y space. This process is a crucial part of space weather. Many fundamental issues about dayside reconnection remain unsolved — quantitatively and even qualitatively — due to a number of complications. The reconnection process at the dayside is usually asymmetric\, often has flow shear due to the sol ar wind\, and three-dimensional effects can play a role. This talk will sum marize recent theoretical\, numerical\, and observational work on these top ics\, including the local efficiency and properties of reconnection at the dayside\, asymmetric reconnection with a flow shear\, and the tailward moti on of open flux tubes (flux transfer events). Theoretical predictions are c ompared to two-dimensional local numerical simulations and three-dimensiona l global magnetosphe! ric magnetohydrodynamic simulations. For each study\, applications and differences with previous knowledge will be discussed. LAST-MODIFIED:20160204T144951Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120405T170000Z DTEND:20120405T180000Z DTSTAMP:20260828T094430Z UID:k7vjdedpp3t399f9cm94nkj9hk@google.com CREATED:20120220T155125Z DESCRIPTION:Title : Multivalent Polymers in the Design of Hybrid Biomateria ls\nSpeaker Name: Kristi L. Kiick\nSpeaker Institution : University of Dela ware\nAbstract : Macromolecular structures that are capable of selectively and efficiently engaging cellular targets offer important approaches for me diating biological events and in the development of composite materials. We have employed a combination of biosynthetic tools\, bioconjugation strateg ies and biomimetic assembly to investigate the impact of multivalent polyme r architecture on materials properties in multiple areas.\nIn one area\, th e display of ligands on polypeptide templates has permitted their useful or ganization. The controlled architecture of the polymers has offered unique opportunities for controlling how these macromolecules selectively interact with protein and cell-surface receptor targets. The ability to tailor the chemical composition of the macromolecules offers opportunities for the dev elopment of probes and therapeutics.\nIn another area\, the interactions of glycopolymers with proteins have been used in the formation of hydrogels. The release of the growth factors from these materials\, in response to the ir receptors\, provides a novel mechanism for targeted delivery via deliver y-mediated erosion. Interactions of various cells with these materials can be modulated on the basis of mechanical and chemical cues\; these architect ures may therefore be employed to understand cellular interactions with mat erials and to develop hydrogels with controlled properties useful for bioma terials applications. New modular polypeptides capable of binding to releva nt polysaccharides have also been developed and show both excellent mechani cal properties and cellular responsiveness. LAST-MODIFIED:20120220T155146Z LOCATION:Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151109T110000 DTEND;TZID=America/New_York:20151109T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151109T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Vanessa Sih\n\nSpeaker Institution: University of Michigan\n\nTitle: Ultrafast optical measurements of spin polarization i n semiconductors\n\nAbstract:We are interested in understanding mechanisms that generate and manipulate electron spin polarization in non-magnetic mat erials using applied electric fields. In this talk\, I will describe optic al techniques that can measure the magnitude and direction of spin-orbit fi elds and electrically-generated spin polarization in non-magnetic semicondu ctors [1] and the modification of the electron spin precession frequency in a bulk semiconductor using an applied in-plane electric field [2]. These techniques can sensitively measure and distinguish changes in the electron g-factor from changes in the effective magnetic fields produced by spin-orb it splitting and nuclear spin polarization. I will also discuss our recent development of resonant and time-resolved spin noise spectroscopy\, which uses a train of short laser pulses to measure the spin correlation function with a temporal resolution that is limited by the optical pulse duration [ 3].\n[1] B. M. Norman et al.\, Phys. Rev. Lett 112\, 056601 (2014)\n[2] M. Luengo-Kovac et al.\, Phys. Rev. B 91\, 201110(R) (2015)\n[3] B. C. Pursley et al.\, arXiv:1508.07383. LAST-MODIFIED:20151030T185814Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140320T163000Z DTEND:20140320T173000Z DTSTAMP:20260828T094430Z UID:mlltimkh3smjiiqpa6mimrjbl8@google.com CREATED:20140313T185213Z LAST-MODIFIED:20140313T185257Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics - No Seminar this week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150505T180000Z DTEND:20150505T190000Z DTSTAMP:20260828T094430Z UID:43es0c5s4rh0ef2sb7t5e1u6oc@google.com CLASS:PUBLIC CREATED:20150429T191401Z DESCRIPTION:Speaker Name: Leonardo DiCarlo\n\nSpeaker Institution: Delft Un iversity of Technology\, The Netherlands\n\nTitle: Protecting a superconduc ting logical qubit from bit-flip error\n\nAbstract: The safeguarding of qua ntum data against arbitrary errors induced by decoherence and faulty hardwa re is an outstanding challenge for all quantum information platforms. Quant um error correction requires a combination of quantum and classical capabi lities: discretizing and signaling physical qubit errors through non-demoli tion quantum parity measurements\, and tracking these errors with a classic al controller that simultaneously advances computation. I present an imple mentation of the textbook quantum repetition code protecting one logical qu bit (a two-dimensional subspace in a three-qubit Hilbert space) from bit-fl ip error\, realized on a circuit QED processor with twelve superconducting quantum elements controlled by room-temperature electronics. The discussio n of this processor’s performance and limitations motivates a survey of cur rent efforts in QuTech targeting a scalable quantum architecture and scalab le control electronics for protecting quantum data against arbitrary errors .\n LAST-MODIFIED:20150505T121131Z LOCATION:CSS 2115 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140428T173000Z DTEND:20140428T190000Z DTSTAMP:20260828T094430Z UID:3lrkcv6ttcbcmeco6tf99nfu2k@google.com CREATED:20140415T204348Z DESCRIPTION:Speaker: Shailesh Chandrasekharan\, Duke\n\nTitle: Sign Problem s\, Fermion Bags and a New Origin for Fermion Mass.\n\nAbstract: We discuss a new approach to solve fermion sign problems called\nthe fermion bag appr oach. The idea is to collect fermion degrees\nof freedom within certain spa ce-time regions (called fermion bags)\nand sum only over fermion world line s within this region. The summation\nover these world lines then gives the Boltzmann weight of the fermion\nbag. There are many interesting models whe re the fermion bag weights\nturn out to be positive. Sign problems in many of these models could\nnot be solved earlier with traditional methods.\n\nI n addition to solving new sign problems\, the fermion bag approach also\npr ovides insight into the physics of fermion mass generation. For example\,\n it seems possible that massless fermions can become massive not only\nthrou gh the formation of a fermion bilinear condensate as usual\, but also\nthro ugh a new mechanism where the fermion condensate remains zero.\nWe provide numerical evidence for the latter scenario in a three dimensional\nlattice four-fermion model. LAST-MODIFIED:20140423T175523Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150520T180000Z DTEND:20150520T191500Z DTSTAMP:20260828T094430Z UID:4ric7pr6rks564ru8mq9pf1s1s@google.com CREATED:20150514T173135Z DESCRIPTION:Speaker Name: Maissam Barkeshli\n\nSpeaker Institution: Micro soft Station Q\n\nTitle: Extrinsic Defects and Possible New Experimental Pr obes of Topological Order\n\nAbstract: Topologically ordered states\, such as the fractional quantum Hall (FQH) states\, are quantum states of matter with various exotic properties\, including quasiparticles with fractional quantum numbers and fractional statistics\, and robust topology-dependent g round state degeneracies. In this talk\, I will describe a new aspect of to pological states: their extrinsic defects. These include extrinsically impo sed point-like or line-like defects that couple to the topological properti es of the state in non-trivial ways. The extrinsic point defects localize t opologically protected "parafermion" zero modes\, which generalize the noti on of Majorana fermion zero modes\, and provide a new direction for realizi ng non-Abelian quantum statistics and topological quantum computation. The line defects allow direct quantum mechanical coupling between electrons and fractionalized anyons\, leading to new ways to probe fractionalization. Af ter describing the conceptual framework\, I will focus on a specific set of experimental proposals\, using conventional bilayer FQH states\, to detect parafermion zero modes and to directly observe the long-predicted topologi cal ground state degeneracy of FQH states. In the end I will comment on oth er ways in which extrinsic defects provide a new window into fractionalizat ion.\n\nhost is Mohammad Hafezi LAST-MODIFIED:20150518T133720Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160331T201500Z DTEND:20160331T214500Z DTSTAMP:20260828T094430Z UID:7ilde8cuh217caee25uvfak7go@google.com CREATED:20160303T190333Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART II (March 30\, 31\, April 1) will review a closel y related topic\, the mysterious entropy associated with black holes and ot her causal horizons (e.g. in cosmology). This part will explain why horizon s obey the laws of thermodynamics\, and how corrections coming from quantum mechanics and string theory are manifested. I will also discuss nonpertur bative speculations concerning microstates\, the information puzzle\, and f irewalls. LAST-MODIFIED:20160303T190422Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151109T210000Z DTEND:20151109T220000Z DTSTAMP:20260828T094430Z UID:qttcrmfk05blfpoekbmoa3clmk@google.com CREATED:20151104T142329Z DESCRIPTION:Speaker Name: Alexander Grishaev\n\nSpeaker Institution : NIH/N IST\n\nTitle : Accurate interpretation of solution scattering data for prot eins: influence of solvent modeling\n\nAbstract : Solution X-ray scattering is becoming an increasingly important component of structural biology stud ies due to its ability to characterize systems challenging for such establi shed experimental biophysical techniques as X-ray crystallography or NMR. F or example\, solution scattering data are expected to be particularly usefu l as structural restraints in studies of flexible or dynamic systems or mic elle-embedded membrane proteins. With such applications in mind it becomes particularly important to maximize both the information content and fidelit y of modeling of the X-ray scattering data. In this talk we will describe a pproaches to address these issues that highlight importance of appropriate treatment of the solvent the macromolecule is embedded in. These approaches will be validated by monitoring the ability to discriminate between the ca ndidate structural models based on fit of the SAXS data. LAST-MODIFIED:20151104T144556Z LOCATION:Room 0112 Chemistry Bldg. (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150302T160000Z DTEND:20150302T170000Z DTSTAMP:20260828T094430Z UID:dg8ba9isnortk1n3or0h691srg@google.com CLASS:PUBLIC CREATED:20150203T185651Z DESCRIPTION:Speaker Name: Gerhard Rempe\n\nSpeaker Institution: MPQ\n\nTitl e: Photonic Quantum Networks\n\nAbstract: Cavity quantum electrodynamics wi th single atoms is an ideal platform for the implementation of quantum-cohe rent networks. The talk will highlight recent experiments like long-distanc e quantum-state transfer\, controlled atom-atom entanglement\, atomic-state teleportation\, nondestructive photon detection\, atom-photon quantum gate s and heralded memories. LAST-MODIFIED:20150227T131224Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160328T203000Z DTEND:20160328T213000Z DTSTAMP:20260828T094430Z UID:j56et3ma421nd3sos2io3pme18@google.com CREATED:20160201T164836Z DESCRIPTION:Speaker Name: James Drake\n\nSpeaker Institution : University o f Maryland\n\nTitle : A Heliosphere with Jets\n\nAbstract : The conventiona l picture of the heliosphere is that of a comet-shaped structure with an ex tended tail produced by the relative motion of the sun through the local in terstellar medium (LISM). Recent MHD simulations of the global heliosphere have revealed\, however\, that the heliosphere drives magnetized jets to th e north and south similar to those driven by the Crab Nebula and other astr ophysical objects...\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\n LAST-MODIFIED:20160201T165047Z LOCATION:CSS Building Rm 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131216T183000Z DTEND:20131216T193000Z DTSTAMP:20260828T094430Z UID:7f56n6po3568gddvp097jf9b6s@google.com CLASS:PUBLIC CREATED:20131211T150722Z DESCRIPTION:Speaker: Hsin-I Lu\, Harvard\n\nTitle: \nMagnetic Trapping of M olecules via Optical Loading and Magnetic Slowing \n\nAbstract:\nMethods fo r delivering cold\, chemically diverse molecules in large quantities could impact the areas of quantum simulation\, cold controlled chemistry\, and pr ecision measurements. Towards a general approach to trapping and cooling mo lecules\, including polyatomic species\, we have implemented few photon loa ding of molecules into magnetic traps. We report magnetic trapping of calci um monofluoride (CaF) using optical pumping and magnetic slowing. Starting from a buffer-gas cooled slow beam\, CaF with an initial velocity of 30 m/s is further slowed via magnetic forces as it enters a 800 mK deep magnetic trap. Employing two-stage optical pumping\, CaF is irreversibly loaded into the trap via two scattered photons. We observe a trap lifetime exceeding 5 00 ms\, limited by background collisions. This method paves the way for coo ling and magnetic trapping of chemically diverse molecules without closed c ycling transitions. Cold atom-molecule collisions\, cold controlled chemist ry\, and sympathetic cooling of molecules will be studied based on this wor k.\n \n[1] A cold and slow molecular beam. H.-I Lu\, J. Rasmussen\, M. J. W right\, D. Patterson\, and J. M. Doyle. Phys. Chem. Chem. Phys.\, 2011\, 13 \, 18986-18990\n \n[2] Magnetic Trapping of Molecules via Optical Loading a nd Magnetic Slowing. H.-I Lu\, I. Kozyryev\, B. Hemmerling\, J. Piskorski\, and J. M. Doyle. arXiv:1310.2669\n LAST-MODIFIED:20131211T150722Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160211T173000Z DTEND:20160211T183000Z DTSTAMP:20260828T094430Z UID:c9lklgqq9sa78s00b0cl8hoteo@google.com CREATED:20160129T153501Z DESCRIPTION:Speaker Name: David Levermore\n\nSpeaker Institution : UMD Dept of Mathematics\n\nTitle : Scattering Theory for the Boltzmann Equation and the Arrow of Time\n\nAbstract : We develop a scattering theory for a class of eternal solutions of the Boltzmann equation posed over all space. In th ree spatial dimensions\, each of these solutions has thirteen conserved qua lities. The Boltzmann entropy has a unique minimizer with the same thirteen conserved values. This minimizer is a local MAxwellian that is also a glob al soution of the Botlzmann equation - a so-called global Maxwellian. We sh ow that each of our external solutions has a streaming asymptotic state as time goes to minus- or plus-infinity. However\, it does not converge to the associated gloabl Maxwellian as time goes to infinity unless it is that gl obal Maxwellian. The Blotzmann entropy decreases as time increases\, but do es not decrease to its minimum as time goes to infinity. Said another way\, the final step in the traditional argument for the heat death of the unive rse is not valid. LAST-MODIFIED:20160129T153725Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140922T200000Z DTEND:20140922T210000Z DTSTAMP:20260828T094430Z UID:q009mabncbdse0dnmmqt9n553s@google.com CREATED:20140922T154148Z DESCRIPTION:Speaker Name: Daniel Dwyer\n\nSpeaker Institution: University o f Maryland\n\nTitle: Emergent biophysical aspects of pathogen cell death as sociated with antibiotic susceptibility\n\nAbstract: Programmed cell death is a gene-directed process involved in the development and homeostasis of m ulticellular organisms. The best understood mode of programmed cell death i s apoptosis\, which is characterized by a stereotypical set of biochemical and morphological hallmarks. In this talk\, I will discuss new and previou s results illustrating that lethally stressed Escherichia coli also exhibit characteristic markers of apoptosis. Most notably\, it is becoming apprec iated that dynamic reorganization of the anionic phospholipid\, phosphatidy lserine\, is a feature of challenged bacterial cultures. Findings related to cytoskeletal rearrangement and regulatory promiscuity will also be discu ssed.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangout s/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXA uY2FsZW5kYXIuZ29vZ2xlLmNvbQ.q009mabncbdse0dnmmqt9n553s&hs=121 LAST-MODIFIED:20140922T155111Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151112T173000Z DTEND:20151112T183000Z DTSTAMP:20260828T094430Z UID:f17oc9189kei18fqc7392mb8jg@google.com CREATED:20151001T185308Z DESCRIPTION:Quantifying stability in networks: From linear to basin stabili ty\nJuergen Kurths\nPotsdam Inst. for Climate Impact and Humboldt Universit y LAST-MODIFIED:20151001T185309Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140130T190000Z DTEND:20140130T203000Z DTSTAMP:20260828T094430Z UID:7flvrp1k8b28nm9mt7oo98s174@google.com CREATED:20140108T164112Z DESCRIPTION:Speaker: Jake Koralek\, Lawrence Berkeley National Lab\n\nTitl e: Shedding Light on Quantum Matter\n\nAbstract: Quantum materials are tho se in which the interactions between constituent particles are too strong t o be treated semiclassically\, resulting in exotic emergent properties such as high Tc superconductivity. They represent the front line in the quest t o understand the organizing principles that lead to complex collective beha vior\, and to eventually apply these principles to do something useful.\nIn this talk I will discuss the application of a wide range of optical and el ectron spectroscopies to quantum materials. In the cuprate superconductors\ , for example\, we have used femtosecond pulses of laser-light to excite co llective modes of the charge density wave order recently discovered in thes e materials. In these experiments we are able to directly observe the coupl ing between Cooper pairs and charge density waves\, which may hold the key to high Tc superconductivity. In similar experiments\, we have studied the collective modes of exotic spin textures like the Skyrmion lattice in MnSi. These experiments are complimented by time-resolved x-ray scattering to di rectly observe the dynamics of spin\, charge and orbital order. I will also discuss the use of transient four-wave mixing to manipulate spins in a spi n-orbit coupled 2D electron gas. And\, finally\, I will discuss some of ou r very recent work on Iridium oxides\, which possess both strong electron-e lectron interactions and strong spin-orbit coupling\, providing an ideal pl ayground for demonstration of exotic new ground states.\n\n\nHost: Victor Galitski LAST-MODIFIED:20140117T221556Z LOCATION:Physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150605T160000Z DTEND:20150605T170000Z DTSTAMP:20260828T094430Z UID:r7bu66e1ii8k83kbeojeed6ndk@google.com CLASS:PUBLIC CREATED:20150529T172609Z DESCRIPTION:Speaker Name: Daniel Barker\n\nSpeaker Institution: JQI\n \nTi tle: Enhanced Magnetic Trap Loading for Atomic Strontium\n \nAbstract: We investigate a technique to improve loading of atomic strontium into a magne tic trap by using a Magneto-Optical Trap (MOT) depumping laser on the 688 n m\, 3P1 -3S1\, transition. Strontium degenerate gas experiments typically u se a 1S0 - 1P1 transition MOT to load a magnetic trap via a slow (~1:150\,0 00) leak to the metastable 3P2 state. The leaked atoms populate the 3P2 and 3P1 states in a 1:2 ratio\, which allows for accelerated magnetic trap loa ding by pumping 3P1 atoms into 3P2 via 3S1. We stabilize the 688 nm laser t o within one transition linewidth using slow feedback from a wavemeter. The depumping laser increases atom number in the magnetic trap\, and subsequen t cooling stages\, by up to 70% for the bosonic isotopes and up to 30% for the fermionic isotope of strontium. We discuss the performance of the depum ping strategy with respect to laser detuning\, intensity\, and beam size\; and compare our results to a 1D rate equation model of the system.\n\n​IMPO RTANT NOTE- Free Lunch served at 11:45 LAST-MODIFIED:20150603T194411Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140414T180000Z DTEND:20140414T190000Z DTSTAMP:20260828T094430Z UID:h9jfh5df2vmceu2qsu99fs24n4@google.com CREATED:20140327T150205Z DESCRIPTION:Speaker: Tony Lee\n\nTitle:Quantum synchronization of quantum v an der Pol oscillators with cold atoms\n\nAbstract:\nSynchronization of osc illators is a universal phenomenon in classical nonequilibrium systems\, su ch as heart tissue and circadian rhythm. There has been a lot of work on s ynchronization in the classical regime. I discuss what happens to synchroni zation in the quantum limit\, when the oscillators are near the quantum gro und state. It turns out that synchronization survives in the quantum limit despite the abundance of quantum noise. Furthermore\, the oscillators becom e entangled with each other\, which is a genuinely quantum feature. In fact \, two oscillators exhibit an ‘entanglement tongue\,’ which is the quantum analog of an Arnold tongue. I discuss how quantum synchronization can be ob served using two-level atoms with dissipative coupling.\n\nT. E. Lee and H. R. Sadeghpour\, Phys. Rev. Lett. 111\, 234101 (2013)\n\nT. E. Lee\, C.-K. Chan\, and S. Wang\, Phys. Rev. E 89\, 022913 (2014\n- See more at: http:// jqi.umd.edu/events/2014/04/14/quantum-synchronization-quantum-van-der-pol-o scillators-cold-atoms#sthash.TPfNfz8q.dpuf\nHost: Anzi Hu LAST-MODIFIED:20140403T202733Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140210T200000Z DTEND:20140210T210000Z DTSTAMP:20260828T094430Z UID:cplapvtmfe29oig373h5inuqpg@google.com CREATED:20140203T155406Z DESCRIPTION:Title: AMS02 results support the secondary origin of cosmic ray positrons\n\nSpeaker: Kfir Blum\, IAS\, Princeton\n\nAbstract: We show tha t the recent AMS02 positron fraction measurement is consistent with a secon dary origin for positrons\, and does not require additional primary sources such as pulsars or dark matter. The measured positron fraction at high ene rgy saturates an upper bound for secondary production\, obtained by neglect ing radiative losses. This coincidence is a compelling indication for a sec ondary source. Within the secondary model the AMS02 data imply a cosmic ray propagation time in the Galaxy of ~ 1Myr and an average traversed interste llar matter density comparable to the density of the Milky Way gaseous disk .\n LAST-MODIFIED:20140205T140542Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140225T181500Z DTEND:20140225T193000Z DTSTAMP:20260828T094430Z UID:k24i7io8457t31m7opn4mom0ek@google.com CREATED:20140217T150744Z DESCRIPTION:Title : Quantum Simulation in Ultracold Ion Traps.\n\nSpeaker N ame: Professor Jim Freericks\n\nSpeaker Institution : Georgetown University \n\nAs in the past\, each seminar will be preceded by an Informal Cafeteria Lunch to which all are welcome\, departing from Room 1108 about five minut es after 12:00 (Noon) LAST-MODIFIED:20140217T150744Z LOCATION:Room 1116\, IPST Bldg. Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151026T200000Z DTEND:20151026T210000Z DTSTAMP:20260828T094430Z UID:kuecg6vdskht7cndk5j4bakikk@google.com CREATED:20151022T132755Z DESCRIPTION:Speaker Name: Jasna Brujic \n\nSpeaker Institution : New York U niversity\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20151022T132755Z LOCATION:0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140227T183000Z DTEND:20140227T190000Z DTSTAMP:20260828T094430Z UID:tkgnmj99m14uddt6qtoflqchv8@google.com CREATED:20140108T164302Z LAST-MODIFIED:20140108T164451Z LOCATION:Physics Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140423T173000Z DTEND:20140423T190000Z DTSTAMP:20260828T094430Z UID:19msrkqg0bmecf00a6kddl0jus@google.com CREATED:20140130T141820Z DESCRIPTION:Title: Stellar Tidal Disruption: the Role of General Relativity \n\nSpeaker: Nicholas Stone\, Columbia\n\nAbstract: In tidal disruption eve nts (TDEs)\, stars passing too close to supermassive black holes (SMBHs) ar e violently torn apart. I will discuss several recent findings about the l ight curves of these events\, including the role of orbital pericenter\, wa ys in which the spin of the SMBH can be imprinted into TDE light curves\, a nd possible emission of high frequency gravitational waves. I will also di scuss an ongoing project focused on how highly eccentric debris streams fro m a TDE can circularize into a luminous accretion disk. It appears likely that the circularization process is mediated by general relativistic effect s: circularization is aided by apsidal precession and hindered by nodal pre cession due to Lense-Thirring torques. The spin of the SMBH may therefore be encoded in the debris circularization timescale. LAST-MODIFIED:20140417T193307Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar *New location* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141007T150000Z DTEND:20141007T163000Z DTSTAMP:20260828T094430Z UID:0nacvau3es1uovt3tcg54ie59o@google.com CREATED:20140929T140712Z DESCRIPTION:Speaker Name: Joaquin E. Drut\, Assistant Professor and Melchor Fellow\n\nSpeaker Institution: University of North Carolina\n\nTitle: Tow ards the entanglement of strongly coupled fermions via lattice Monte Carlo\ n\nAbstract: \n\nThe calculation of the entanglement properties of strongly coupled many-body systems\, in particular Renyi and von Neumann entropies\ , continues to be an active research area with many open questions. In this talk\, I will outline the challenges and describe some of the advances\, b y my group and others\, towards the characterization of entanglement in non -relativistic many-fermion systems using novel lattice Monte Carlo strategi es.\n\nHost: Bitan Roy\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20140929T140712Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141210T210000Z DTEND:20141210T223000Z DTSTAMP:20260828T094430Z UID:bmjs5ednm20c3nt5oh3pma66co@google.com CREATED:20141204T141257Z DESCRIPTION:Title : "Flavored Dark Matter"\nSpeaker Name: Zackaria Chacko\n Speaker Institution : University of Maryland\nAbstract : I consider the pos sibility that dark matter\, like the standard model quarks and leptons\, co mes in three flavors. I show that this scenario is motivated by grand unif ication\, and discuss its implications for direct and indirect detection of dark matter\, and for discovery at the LHC.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/high-energy?hceid=bG JrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.bmjs5e dnm20c3nt5oh3pma66co&hs=121 LAST-MODIFIED:20141204T141424Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151203T173000Z DTEND:20151203T183000Z DTSTAMP:20260828T094430Z UID:2bcvieaija1q1tqij11g6ed0do@google.com CREATED:20151001T185446Z DESCRIPTION:Speaker Name: Dr. Dong Ho Wu\n\nSpeaker Institution: Naval Re search Laboratory\\\n\nTitle: Wave chaos and enhancement of coherence with rippled waveguides\n LAST-MODIFIED:20151202T190932Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140924T200000Z DTEND:20140924T210000Z DTSTAMP:20260828T094430Z UID:03mbg1213hd20onlphcvrn97eo@google.com CREATED:20140917T140832Z DESCRIPTION:Speaker Name: George Wilkie\n\nSpeaker Institution : University of Maryland\n\nTitle: Non-Maxwellian Alpha Particles in Gyrokinetics\n\nA bstract : Gyrokinetic simulations have traditionally been performed assumin g a Maxwellian equilibrium distribution. However\, there are many situation s in which one is interested in modelling a weakly-collisional species\, su ch as fusion-produced alpha particles in tokamaks. This talk will provide a n overview of non-Maxwellian gyrokinetics\, explore situations in which the non-Maxwellian nature of a species is important\, and present recent resul ts on the transport of slowing-down alpha particles.\n\n\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hc eid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ. 03mbg1213hd20onlphcvrn97eo&hs=121 LAST-MODIFIED:20140917T141051Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151019T110000 DTEND;TZID=America/New_York:20151019T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151019T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Mark Saffman\, Wisconsin \n\nClimbing mount entanglement with c old atoms and Rydberg blockade\n\nRydberg interactions can be applied in a variety of ways enabling control of single atom qubits\, multi-atom ensembl e qubits\, and hybrid entanglement between different types of atoms\, betwe en atoms and photons\, or between atoms and solid state qubits. In experim ents with N~10 atom ensembles we demonstrate preparation of entangled W sta tes\, and strong blockade between spatially separated ensembles. In an arra y of single atom qubits we demonstrate high fidelity single qubit gates\, a nd improved fidelity of Rydberg blockade mediated entanglement\, surpassing all previous experiments. Progress towards a hybrid atom-superconductor in terface based on entanglement of a single atom in a cryostat and a microwav e photon will be presented. LAST-MODIFIED:20150923T165110Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150219T220000Z DTEND:20150220T000000Z DTSTAMP:20260828T094430Z UID:qgf742ck729f50k5bpapsrqvpc@google.com CREATED:20150123T205341Z DESCRIPTION:Speaker Name: Ayush Gupta (Moderator)\n\nSpeaker Institution: University of Maryland\n\nTitle: Beyond Academia: Career Pathways in Phys ics\n\nThe Women in Physics at the University of Maryland invite all underg raduate students\, graduate students\, and researchers to a panel discussio n of physics careers outside academia. Additional information about our pan el and invited speakers can be found on our website:physics.umd.edu/wip/pan el LAST-MODIFIED:20150219T210857Z LOCATION:Toll Physics Building\, Room 1412 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Beyond Academia Career Panel TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T190000Z DTEND:20140331T200000Z DTSTAMP:20260828T094430Z UID:3thtiu0rvai24dahmb3rsujmvo@google.com CREATED:20140325T180320Z DESCRIPTION:Speaker Name: Ludwig Bartels\n\nSpeaker Institution: Department of Chemistry\, with affiliations in Physics\, Elec. Eng.\, and Mech. Eng.\ , University of California—Riverside\n\nTitle: Preparation and Modificatio n of Transition Metal Dichalcogenides: From Bandgap Engineering to Investig ations of Surface Activity\n\nAbstract: Transition metal dichalcogenides ( TMDs) such as MoS2 have attracted widespread attention because they combine some of the fascinating properties of graphene\, such as stability at the monolayer limit and well-defined transport properties\, with native semicon ducting and direct-bandgap behavior. In the second part of my talk\, I will describe methods of CVD fabrication of single layer TMDs. The use of organ ic precursors allows formation of alloys that permit continuously tunable b andgap.1 Post-growth processing of single layer material can further alter its properties\, of which I will provide a few examples.\nMoS2 is also the key compound in industrial hydrodesulfurization of gasoline for automotive applications. In the first part of my talk\, I will address the growth of m olybdenum-sulfur compounds on a Cu(111) surface. In particular\, we find a range of non-MoS2 surface structures and characterize their interaction wi th oxygen-containing adsorbates such as anthraquinone and formic acid. The highest binding affinity is found for a surface structure that is identifi ed as Mo2S3\, and not for the edges of MoS2 islands\, to which typically ac tivity of MoS2-based catalysts is attributed.2 \n\n1.Mann\, J.\, Ma\, Q.\, Odenthal\, P.M.\, Isarraraz\, M.\, Le\, D.\, Preciado\, E.\, Barroso\, D.\, Yamaguchi\, K.\, Son\, G.v.\, Nguyen\, A.\, Tran\, T.\, Wurch\, M.\, Nguye n\, A.\, Klee\, V.\, Bobek\, S.\, Sun\, D.\, Heinz\, T.F.\, Rahman\, T.S.\, Kawakami\, R. & Bartels\, L. 2-Dimensional Transition Metal Dichalcogenide s with Tunable Direct Band Gaps: MoS2(1-x)Se2x Monolayers\, Adv. Mater. 26\ , 1399-1404 (2014).\n2.Sun\, D.\, Lu\, W.\, Le\, D.\, Ma\, Q.\, Aminpour\, M.\, Alcántara Ortigoza\, M.\, Bobek\, S.\, Mann\, J.\, Wyrick\, J.\, Rahma n\, T.S. & Bartels\, L. An MoSx Structure with High Affinity for Adsorbate Interaction\, Angewandte Chemie 124\, 10430-10434 (2012).\n LAST-MODIFIED:20140325T180320Z LOCATION:Toll Physics Bldg.\, Room 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL CONDENSED MATTER SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160401T173000Z DTEND:20160401T190000Z DTSTAMP:20260828T094430Z UID:gvoadre86g83n62hmppo7ql070@google.com CREATED:20160303T190414Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART II (March 30\, 31\, April 1) will review a closel y related topic\, the mysterious entropy associated with black holes and ot her causal horizons (e.g. in cosmology). This part will explain why horizon s obey the laws of thermodynamics\, and how corrections coming from quantum mechanics and string theory are manifested. I will also discuss nonpertur bative speculations concerning microstates\, the information puzzle\, and f irewalls. LAST-MODIFIED:20160303T190414Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141204T173000Z DTEND:20141204T183000Z DTSTAMP:20260828T094430Z UID:ki0m0m9vfcgrt22q26ib4t68s0@google.com CREATED:20140911T190145Z DESCRIPTION:Speaker Name: Seth Putterman\n\nSpeaker Institution : UCLA\n\nT itle: Translating sonoluminescence to therapy for MRSA chronic wounds\n\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.ki0m0m9vfcgrt22q26ib4t68s0&hs=121 LAST-MODIFIED:20140911T190304Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150521T173000Z DTEND:20150521T180000Z DTSTAMP:20260828T094430Z UID:lbb6floslehdbge5v4e3nsq4hk@google.com CREATED:20150510T193351Z LAST-MODIFIED:20150510T193351Z LOCATION:Room 1305F John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150914T150000Z DTEND:20150914T160000Z DTSTAMP:20260828T094430Z UID:mlcq9ql1e5jhqip709f9b3joqg@google.com CREATED:20150707T152735Z DESCRIPTION:\nSteven M. Girvin\, Yale University\n\nQuantum Reservoir Engin eering in Circuit QED\n\nQuantum systems are never completely isolated\, bu t instead interact with degrees of freedom in the surrounding environment\, eventually leading to decoherence of the system. The conventional route to long-lived quantum coherence involves minimizing coupling to the dissipati ve bath. Paradoxically\, it is possible in principle to instead engineer s pecific couplings to a quantum environment that allow dissipation to actual ly create and preserve coherence. I present a simple scheme to engineer th e photon shot noise in a microwave cavity so that it relaxes a qubit toward s any desired point on the Bloch sphere [1] and which can autonomously stab ilize the entanglement of a pair of qubits [2]. More recently we have real ized a multi-qubit cooling scheme which preserves the total number of excit ation quanta thus paving the way for quantum simulations of the Bose-Hubbar d model within the canonical ensemble [3].\n\n[1] ‘Cavity-Assisted Quantum Bath Engineering\,’ K. W. Murch\, U. Vool\, D. Zhou\, S. J. Weber\, S. M. G irvin\, and I. Siddiqi\, Phys. Rev. Lett. 109\, 183602 (2012).\n[2] ‘Stabil izing entanglement autonomously between two superconducting qubits\,’ S. Sh ankar\, M. Hatridge\, Z. Leghtas\, K. M. Sliwa\, A. Narla\, U. Vool\, S. M. Girvin\, L. Frunzio\, M. Mirrahimi\, M. H. Devoret\, Nature 504\, 419-422 (2013).\n[3] ‘Cooling and Autonomous Feedback in a Bose-Hubbard chain\,’ Sh ay Hacohen-Gourgy\, Vinay Ramasesh\, Claudia De Grandi\, Irfan Siddiqi\, S. M. Girvin\, arXiv:1506.05837. LAST-MODIFIED:20150707T152752Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160208T210000Z DTEND:20160208T220000Z DTSTAMP:20260828T094430Z UID:5kcvmqk5jbia2i99gln55qre2o@google.com CREATED:20160129T153311Z DESCRIPTION:Speaker Name: Alexander van der Horst\n\nSpeaker Institution : George Washington University\n\nTitle : Hunting for Transients in the Radio Sky\n\nAbstract : While a large fraction of the observable Universe is ste ady and does not change on human timescales\, there are objects displaying variability on timescales of years to days\, to even small fractions of a s econd. These cosmic transients are usually associated with the most extreme phenomena in the Universe like neutron stars\, black holes\, or the format ion of these exotic objects. Their variability can be observed across the e ntire electromagnetic spectrum. Within the multi-wavelength picture\, the r adio regime reveals incoherent synchrotron emission of high-energy particle s moving in the present magnetic fields or coherent radiation from ultra-co mpact structures. In the past\, studies of transients at radio frequencies have mostly been prompted by detections at higher frequencies\, in particul ar because most radio observatories were limited in their field of view and /or sensitivity. This has changed significantly in the last few years: all major radio observatories in ! ! the world have recently been upgraded or a re currently being upgraded\, and several new facilities have been or are b eing built. This means large improvements in sensitivity\, bandwidth\, and spatial\, spectral and temporal resolution. Some new observatories explore the low-frequency radio sky down to tens of MHz with unprecedented sensitiv ity. Furthermore\, several new radio facilities have a wide field of view\, perfectly suited for efficient surveys of the entire sky and searches for transient radio phenomena. In this talk I will discuss the progress that ha s been made in our understanding of a variety of transients due to radio ob servations\, discoveries of new phenomena in the radio regime\, and the cur rent efforts and future opportunities in the hunt for radio transients.\nTi tle of Event: JSI Colloquium Series\n\nNotes: Snacks and beverages availabl e at 3:30 pm. LAST-MODIFIED:20160129T153447Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141017T170000Z DTEND:20141017T180000Z DTSTAMP:20260828T094430Z UID:pirk5ke085ke9j318mh8dpnq3k@google.com CREATED:20141009T151841Z DESCRIPTION:Speaker Name: E. Ma\n\nSpeaker Institution: Johns Hopkins Unive rsity\n\nTitle : Metallic Glasses: At the Cutting Edge of Metals Research\n \nAbstract: The metals we are familiar with are all crystals. But in recent years\, amorphous metals have emerged as a new category of metallic alloys . They are currently a focus of intense research in the metals community wo rldwide. When metallic glasses were first discovered in the 1960’s\, the al loy compositions then known to be quenchable into the glassy state from the liquid required cooling rates were as high as 106 K s–1 (the products were consequently restricted to very thin sections). The current interest in m etallic glasses has its origin mainly in the increasing range of compositio ns that can now be cast into glasses at much lower cooling rates\, permitti ng minimum sections of 1 mm to 1 cm or even larger (hence the term bulk met allic glasses\, BMGs). My talk will illustrate a few major materials issues for metallic glasses\, focusing mostly on their intriguing atomic-level st ructures\, and correlations of the glass structure with their mechanical pr operties such as their high strength\, large elastic strain and plastic flo w at room temperature.\n\n\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/materials?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.pirk5ke085ke9j318mh8dpnq3k &hs=121 LAST-MODIFIED:20141016T153836Z LOCATION:Room 2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140326T193000Z DTEND:20140326T203000Z DTSTAMP:20260828T094430Z UID:g9bk5apt3idk15s4c1pjh9hqjc@google.com CREATED:20140320T142557Z DESCRIPTION:Speaker Name: Mohammad Hafezi\, Research Associate\,\n\nSpeaker Institution: Joint Quantum Institute\n\nTitle: Topological Features in Pho tonics Systems \n\nAbstract: One of the promising applications of quantum computers is quantum simulation --- the ability to simulate quantum dynamic s on an engineerable physical system. Such simulators allow us to investiga te models that are practically impossible to study on a classical computer. For example\, there are tremendous efforts underway to better understand s ystems with topological order --- global properties that are not discernibl e locally. The best known examples are quantum Hall effects in electronic s ystem\, where insensitivity to local properties manifests itself as conduct ance through edge states that is insensitive to defects and disorder.\n\nIn this talk\, I demonstrate how similar physics can be observed for photons\ ; specifically\, how various quantum Hall Hamiltonians can be simulated in an optical platform. I report on the first observation of topological photo nic edge state using the silicon-on-insulator technology. Furthermore\, the addition of optical nonlinearity to this system provides a platform to imp lement fractional quantum Hall states of photons and anyonic states that ha ve not yet been observed. More generally\, the application of these ideas c an lead to development of on-chip optical devices\, such as delay lines and isolators\, with built-in protection.\n\nBio: Mohammad Hafezi received hi s diplome d'ingenieur from Ecole Polytechnique (Paris) in 2003 and his Ph.D . from Physics Department at Harvard University in 2009. He moved to the Jo int Quantum Institute (NIST/University of Maryland) as a research associate and since 2012 he has been a research faculty. His research is at the inte rface of theoretical quantum optics and condensed matter physics with a foc us on fundamental physics and applications in quantum information science\, precision measurement and integrated photonics.\n\n LAST-MODIFIED:20140321T174550Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150805T180000Z DTEND:20150805T190000Z DTSTAMP:20260828T094430Z UID:v5lt0ee22ipiv151vie4ape3tc@google.com CLASS:PUBLIC CREATED:20150730T134042Z DESCRIPTION:Kurt Jacobs\, Army Research Laboratory\n\nTitle: Completing Fer mi's golden rule: the origin of transition rates in open systems \n\nAbstra ct: Fermi's golden rule is widely used\, and the resulting transition rates are an important part of the thermal behaviour of open quantum systems. Bu t this rule is curious because it is valid outside the regime in which it i s derived: It is derived only for short times and for off-resonant transiti ons but works for all times and for resonant transitions. Here we show anal ytically that an interaction with a resonant\, dense spectrum induces a rat e equation for all times\, giving essentially exact exponential decay in th e appropriate regime. From this analysis we are able to extract the decay r ate\, which is indeed the rate of Fermi's golden rule (with a small correct ion)\, the short\, non-Markovian time period before which the rate equation sets in\, and determine the parameter regime required for this behavior. O ur analysis provides the start of a more solid foundation on which to model thermal baths in terms of interactions with dense spectra. LAST-MODIFIED:20150730T134042Z LOCATION:3100A CSS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120405T200000Z DTEND:20120405T210000Z DTSTAMP:20260828T094430Z UID:n2n4roheikmdfi974j3f1o6gf4@google.com CREATED:20120307T154631Z DESCRIPTION:Speaker: Andy Dorsett\nInstitution: Academic Key Account Manage r\nWolfram Research\, Inc. LAST-MODIFIED:20120307T154651Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Free Mathematica Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140909T200000Z DTEND:20140909T210000Z DTSTAMP:20260828T094430Z UID:oduehipis8jo2gv1rbqas67eps@google.com CREATED:20140718T142039Z DESCRIPTION:Speaker Name: Jaeyoung Park\n\nSpeaker Institution: E=mc2\n\n Title: Measurement of Enhanced Confinement at High Pressure Magnetic Cusp S ystem\n\nAbstract: The issue of plasma confinement in a cusp geometry dates back to the late 1950s\, when Harold Grad and his team at New York Univers ity conjectured (and to some extent calculated) that the confinement proper ties of a magnetic cusp would be dramatically improved if the confined plas ma had sufficiently high pressure to exclude the B-field from the interior. Achieving high beta in a cusp proved very difficult. An experiment carried by Park and his group is the first one in 56 years\, to demonstrate the i ncrease in. confinement experimentally. The implications of this result are profound in that It can lead to electrostatic confinement fusion and break -even using aneutronic reactions such as p-B11. \n\nAs a background I shoul d note that the experiments were conducted by small company a company EMC2 in San Diego with approximately $10-15M Navy funding. The objective was the development of a small aneutronic fusion propulsion reactor for ship and s ubmarine propulsion. Although the program was not classified the Navy did n ot allow public release of the information till last month. I followed the program because I was a member of a 5 people committee that provided biannu al input to the Navy as to its progress. A breakthrough demonstration happe ned approximately 6 month ago and they finally got permission to publish an d present the results. A preprint can be found in http://arxiv.org/abs/1406 .0133\n\n\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/han gouts/_/physics.umd.edu/jaeyoung-park?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ 1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.oduehipis8jo2gv1rbqas67eps&hs=121 LAST-MODIFIED:20140909T184928Z LOCATION: Lobby of the Physical Sciences Complex SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130912T180000Z DTEND:20130912T193000Z DTSTAMP:20260828T094430Z UID:bqbt5qf0jcs4lljqerhvhgvn54@google.com CREATED:20130910T094954Z DESCRIPTION:Speaker: Prof. Ian Appelbaum\, University of Maryland\n\nTitle : Anisotropy-driven spin relaxation in germanium\n\nAbstract: A unique sp in depolarization mechanism\, induced by the presence of g-factor anisotrop y and intervalley scattering\, is revealed by spin transport measurements o n long-distance germanium devices in a longitudinal magnetic field. The con fluence of electron-phonon scattering (leading to Elliott-Yafet spin flips) and this previously unobserved physics enables the extraction of spin life time solely from spin-valve measurements\, without spin precession\, and in a regime of substantial electric-field-generated carrier heating. We find spin lifetimes in Ge up to several hundreds of ns at low temperature\, far beyond any other available experimental results. LAST-MODIFIED:20130910T095015Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141103T160000Z DTEND:20141103T170000Z DTSTAMP:20260828T094430Z UID:73u0ek8i1e7qdfrufd80i2j53s@google.com CREATED:20140711T172249Z DESCRIPTION:Speaker Name: Kartik Srinivasan \n\nSpeaker Institution: NIST\n \nTitle: Quantum frequency conversion and nanocavity optomechanics”.\n\nAbs tract: Quantum frequency conversion is a valuable resource for overcoming spectral mismatch in photonic quantum systems. In this talk\, I will prov ide an overview of our laboratory’s research on a variety of topics related to quantum frequency conversion. This includes proof-of-principle experim ents combining single photon sources and established frequency conversion t echnology\, and the development of a number of different nanophotonic devic es of relevance to photonic quantum information science. Quantum dot singl e photon sources\, four-wave-mixing-based frequency converters\, and nanoca vity optomechanical and electromechanical devices are amongst the topics th at will be discussed\n\nHost: Luis Orozco\n\nJoin with Google Hangouts: htt ps://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrN jYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.73u0ek8i1 e7qdfrufd80i2j53s&hs=121 LAST-MODIFIED:20141028T185909Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120315T170000Z DTEND:20120315T180000Z DTSTAMP:20260828T094430Z UID:1o4mkasi3ablfalil1nkfp4p5c@google.com CREATED:20120228T144206Z DESCRIPTION:Title : Seminar Series Conference Room Learn About MSE Undergra duate Graduate Faculty & Staff Research Research Experience for Teachers Al umni Employment Give to MSE MSE Intranet Contact Info Clark School searc h UMD MSE Event Information MSE Seminar Series: Mike Roland Friday\ , March 16\, 2012 1:00 p.m.-2:00 p.m. Room 2110 Chemical and Nuclear Engine ering Bldg. For More Information: JoAnne Kagle 301 405 5240 jkagle@umd.edu Dynamics of Vitrifying Liquids - The Difficult Problem Albert Einstein Avo ided\nSpeaker Name: Mike Roland\nSpeaker Institution : Chemistry Division\, Naval Research Laboratory\nAbstract : When liquids and polymers are suffic iently cooled or densified\, mutual interactions begin to dominate the beha vior – neighboring species must make small adjustments in position in order for a given molecule to change its configuration. This intermolecular coop erativity greatly complicates the dynamics\, giving rise to striking behavi or. For example\, small changes in temperature or pressure of a “supercoole d” liquid can alter the time scale for molecular motions from nanoseconds t o a duration exceeding the human lifespan. Despite a century of research\, a fundamental understanding\, much less a predictive theory\, of the dynami c properties of dense liquids and polymers is lacking.\nIn this talk I revi ew our progress in quantifying the role of the thermodynamic variables temp erature\, T\, and density\, ρ\, on the dynamics. An important aspect of the work was the discovery that relaxation times and viscosities of molecular liquids and polymers superpose when plotted against the scaling variable T/ ργ\, with the scaling exponent γ a material constant. Moreover\, this scali ng exponent can be related to the nature of the intermolecular repulsive po tential\; thus\, dynamic spectroscopy measurements can be used to quantify the forces between molecules. Other properties derive from the scaling beha vior\, including the Boyer-Spencer rule and the correlation of fluctuations in the potential energy with fluctuations in the virial pressure.\n LAST-MODIFIED:20120228T144223Z LOCATION: Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar. TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140220T190000Z DTEND:20140220T203000Z DTSTAMP:20260828T094430Z UID:7bv9a111k4fe72rvm2niqflf2g@google.com CREATED:20140205T021141Z DESCRIPTION:Speaker: Arkady Shekhter\, Los Alamos National Lab\n\nTitle: Quantum critical point and pseudogap in high-temperature superconducting YB CO cuprates\n\nAbstract: I will discuss our recent resonant ultrasound mea surements on high-quaity single crystal YBCO cuprates. We find a thermodyna mic signature of a line of phase transitions T*(p) at the boundary of the p seudogap region of the doping-temperature phased diagram. In slightly-over- doped crystal the phase transition T*(p) is found below the superconducting transition\, T* 3:1 signal to noise ratio for weak fingerprint peaks in biolog ical systems\, but typically requires acquisition times of several seconds\ ; too slow for imaging. Coherent Raman methods have previously been unable to acquire high quality fingerprint spectra. We have overcome this limitati on by developing a highly efficient signal excitation paradigm and appropri ately harnessing the nonresonant background (NRB) signal that accompanies t he resonant signal of interest. With these and other innovations\, we have developed a CRI approach based on broadband coherent anti-Stokes Raman scat tering (BCARS) that provides an unprecedented combination of speed\, sensit ivity\, and chemical selectivity [1]. Using this system we are able to obta in high quality Raman spectra in the fingerprint and CH stretch regions fro m biological specimens at 3.5 ms\, enabling rapid\, label-free chemical ima ging of even delicate samples. I will briefly put our approach in context w ith the broader CRI field\, describe key technical features of the present imaging system and provide application examples in materials and biology. I will also briefly discuss focus areas for future advances\, and speculate on ultimate performance limits for coherent Raman imaging.\n\n LAST-MODIFIED:20150915T152157Z LOCATION:Jeong H. Kim Building Room 1105 – First Floor (Pepco) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IEEE Photonics Society Meeting TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160218T173000Z DTEND:20160218T183000Z DTSTAMP:20260828T094430Z UID:091kah7tegug7oc3i0k0ojfhmc@google.com CREATED:20160129T153734Z DESCRIPTION:Speaker Name: Andrea Bertozzi\n\nSpeaker Institution : UCLA\, D ept of Mathematics\n\nTitle : Particle laden flows LAST-MODIFIED:20160129T153846Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140811T180000Z DTEND:20140811T190000Z DTSTAMP:20260828T094430Z UID:7crpjtpdbsansh9dspq70plqp0@google.com CREATED:20140808T164153Z DESCRIPTION:Speaker: Ramis Movassagh \n\nInstitution:Department of Mathemat ics\, Northeastern and MIT\n\nTitle: Power law violation of the area law in critical spin chains (joint work with Peter W. Shor)\n\nAbstract: The sub- volume scaling of the entanglement entropy with the system's size\, n\, has been a subject of vigorous study in the last decade. Hastings proved “the area law” for gapped one dimensional systems and it is largely believed tha t\, in quantum critical systems\, the area law would be violated by at most a factor of log(n).\nIn this work\, we generalize the spin-1 model of Brav yi et al [*] to all integer spin-s chains\, whereby we introduce a class of exactly solvable models that exhibit signatures of criticality. The propos ed Hamiltonian is local and translationally invariant. We prove that it is frustration free and has a unique ground state. Moreover\, we prove that th e energy gap scales as poly(1/n). The upper bound we prove is O(n^-2) which also improves the one given in [*] This rules out the possibility of this class of models being described by a conformal field theory. We analytical ly show that the Schmidt rank grows exponentially with n and that the half- chain entanglement entropy to the leading order scales as \\sqrt{n}. Geomet rically\, the ground state is seen as a uniform superposition of all s-colo red Motzkin walks. Our techniques for obtaining the asymptotic form of the entanglement entropy\, the gap upper bound and the self-contained expositio ns of the combinatorial techniques\, more akin to lattice paths\, may be of independent interest. \n~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~\n\n[*] Criticality without Frustration for Quantum S pin-1 Chains\nSergey Bravyi\, Libor Caha\, Ramis Movassagh\, Daniel Nagaj\, and Peter W. Shor\nPhys. Rev. Lett. 109\, 207202 \n\nIf you would like to meet the speaker\, please send an email to Mohammad Maghrebi at magrebi@umd .edu\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/p hysics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdX AuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.7crpjtpdbsansh9dspq70plqp0&hs=121 LAST-MODIFIED:20140808T165402Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120213T213000Z DTEND:20120213T223000Z DTSTAMP:20260828T094430Z UID:m1hi4rhjertemb0nuf8b46uffo@google.com CREATED:20120118T185600Z DESCRIPTION:Title : The modulation of galactic cosmic-ray electrons in the heliosheath\neaker Name: Rogelio A. Caballero-Lopez\nSpeaker Institution : UNAM\, Mexico\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM\nAbstract : Voyag er 1 has observed strong increases in the intensities of 2 to 160 MeV elect rons since crossing the termination shock of the heliosphere in December 20 04. Before this time these intensities were submerged below the detector ba ckground\, except for occasional transient events. These increases are larg e compared to the concurrent increases of positive ions such as H\, He\, an d O. A significant part is probably due to temporal effects as the heliosph ere was recovering to solar minimum conditions from 2005 to early 2010. The intensity observed by Voyager 2 since its crossing of the shock in Septemb er 2007 until early 2010 is five to ten times lower than that observed by V oyager 1\, which is so low that the electron intensity may still be below t he background produced by high-energy protons in the detector. This points to a large North-South asymmetry in the properties of the heliosheath. It i s shown that the observations suggest that these electrons are not freshly accelerated on the termination shock\, but that they rather are of galactic origin - while they may be re-accelerated by that shock. In this work thes e intensities are modeled with numerical solutions of the cosmic-ray transp ort equation. It is shown that because they are relativistic\, the electron s are much more sensitive to the form of the diffusion coefficient at low r igidities than ions\, and that this can explain the asymmetry. Also a discu ssion of the latest Voyager 2 electron observations will be presented. LAST-MODIFIED:20120118T185606Z LOCATION: Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140908T190000Z DTEND:20140908T203000Z DTSTAMP:20260828T094430Z UID:q9mltu2tgi1s2q2c2pr1987ucs@google.com CREATED:20140808T150146Z DESCRIPTION:Speaker Name: Gustavo Tavares\n\nSpeaker Institution: Boston U niversity\n\nTitle: Seeking Lorentz Violations from the Higgs\n\nAbstract: The recently discovered Higgs particle presents new opportunities to explor e Lorentz violation. Ultra-high-energy cosmic rays are one of the most sens itive testing grounds for Lorentz symmetry\, and can be used to seek for an d limit departures from Lorentz invariance in the Higgs sector. The presenc e of Lorentz violations in the Higgs sector would lead to modifications of both Higgs and weak interaction physics. In this talk I will show how consi derations of such modifications applied to Ultra-high-energy cosmic rays al low us to constrain departures from Lorentz invariance in the Higgs sector to parts in 10^{14}.\n\nJoin with Google Hangouts: https://hangouts.google. com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.q9mltu2tgi1s2q2c2pr1987ucs&hs= 121 LAST-MODIFIED:20140908T130725Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151015T190000Z DTEND:20151015T211500Z DTSTAMP:20260828T094430Z UID:t60etqg1906shadqqh3bbna5rg@google.com CREATED:20151013T143055Z DESCRIPTION:\nWilliam K. M. Lau\nEarth Science System Interdisiplinary Cent er\, University of Maryland\n\nAbstract: \nHurricane Sandy\, often referre d to as Superstorm Sandy (SS)\, was the most destructive hurricane of the 2 012 hurricane season\, wreaking havocs along the eastern Atlantic seaboard from Florida to New York. It was also the second most costly hurricane in United States history\, with damages estimated at over $68 billion dollars. Better understanding of causes of intensification and extratropical tran sition of SS has already led to new pathways for adaption and disaster miti gation strategy by first responders in the affected regions. It is therefo re of great scientific and societal interests\, to know or to anticipate wh at can we expect from SS-like storms in a future warming climate\, to bette r inform and provide guidance for future mitigation strategies. \n\nUsing ensemble numerical simulations with the NASA-Unified Physics Weather Resear ch Forecast (NU-WRF) model\, we have investigated possible responses of San dy-like superstorms under conditions of projected future warmer SST. We fi nd that the responses bifurcate into two groups. In the first group\, stor ms are similar to present-day SS from genesis\, storm track to extratropica l transition\, except they propagate faster\, and are much stronger\, with maximum wind destructive power increased by 50-80%\, and heavy rain increas ed by 30-50%. In the second group\, storms have longer exposure time to the Atlantic warm pool\, and amplify to super-hurricane strength over the interior of the warm pool\, with peak destructive power increased by 100-16 0%\, and heavy rain stronger by 70-180%. However\, unlike present-day SS\, these second group of storms after exiting the warm pool\, re-curve northe astward out to sea\, subsequently interact with the developing mid-latitude storm by mutual amplitude modulation\, via counter-clockwise rotation arou nd each other. The remnant of tropical storm eventually amplifies into a s evere Northeastern coastal storm with landfall over the extreme northeaster n regions from Maine to Nova Scotia. The potential societal impacts of the se two scenarios will be discussed. LAST-MODIFIED:20151013T143056Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AOSC Seminar: William K. M. Lau TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140923T171500Z DTEND:20140923T183000Z DTSTAMP:20260828T094430Z UID:ss4qptm9mhm7ono0gji8fv9fo0@google.com CREATED:20140915T173625Z DESCRIPTION:Speaker Name: Professor Stephen Brush\n\nSpeaker Institution : UMCP\n\nTitle: Physics a Century Ago: Memorable or Forgotten?\n\nNotes: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 about five minutes aft er 12:00 (Noon).\n\nFor further information contact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\, (301)405-4878 Professor John D. Weeks\, jdw @umd.edu\, (301)405-4802 Professor Michelle Girvan\, Girvan@umd.edu\, (301) 405-1610.\n\n\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com /hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTB AZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ss4qptm9mhm7ono0gji8fv9fo0&hs=121 LAST-MODIFIED:20140915T173912Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140422T170000Z DTEND:20140422T183000Z DTSTAMP:20260828T094430Z UID:3safglpac2h9q6no1cag80j0b4@google.com CREATED:20140114T160604Z DESCRIPTION:Speaker: Amir Yacoby (Harvard)\n\nTitle: Induced Superconducti vity in the Quantum Spin Hall Edge\n\nAbstract: Topological insulators are a newly discovered phase of matter characterized by a gapped bulk surrounde d by novel conducting boundary states. Since their theoretical discovery\, these materials have encouraged intense efforts to study their properties an d capabilities. Among the most striking results of this activity are propos als to engineer a new variety of superconductor at the surfaces of topologi cal insulators. These topological superconductors would be capable of suppo rting localized Majorana fermions\, particles whose braiding properties hav e been proposed as the basis of a fault-tolerant quantum computer. Despite the clear theoretical motivation\, a conclusive realization of topological superconductivity remains an outstanding experimental goal. Here we present measurements of superconductivity induced in two-dimensional HgTe/HgCdTe q uantum wells\, a material which becomes a quantum spin Hall insulator when the well width exceeds dC = 6:3 nm. In wells that are 7.5 nm wide\, we find that supercurrents are confined to the one-dimensional sample edges as the b ulk density is depleted. However\, when the well width is decreased to 4.5 nm the edge supercurrents cannot be distinguished from those in the bulk. T hese results provide evidence for superconductivity induced in the helical edges of the quantum spin Hall effect\, a promising step toward the demonstr ation of one-dimensional topological superconductivity. Our results also pr ovide a direct measurement of the widths of these edge channels\, which ran ge from 180 nm to 408 nm.\n\nHost: Kostyantyn Kechedzhi\n\nhttp://www.phys ics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140418T190819Z LOCATION:2205 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141002T193000Z DTEND:20141002T203000Z DTSTAMP:20260828T094430Z UID:08sqt9fhg952cmnup3adr0bq4g@google.com CREATED:20140925T164218Z DESCRIPTION:Speaker: Jim Gates and/or William Linch\, Physics\nAbstract: We begin describing the basic setup of supersymmetry and introduce the proble m of integration of superfields.\n\nJoin with Google Hangouts: https://hang outs.google.com/hangouts/_/physics.umd.edu/introduction-to?hceid=bGJrNjYwYT c1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.08sqt9fhg952cm nup3adr0bq4g&hs=121 LAST-MODIFIED:20140925T164218Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to supersymmetry and integration in superspace (cont'd ) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140501T173000Z DTEND:20140501T180000Z DTSTAMP:20260828T094430Z UID:jrcsignpk26ectj7lppmmr7tfg@google.com CREATED:20140406T024849Z LAST-MODIFIED:20140406T024849Z LOCATION:Phys room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150218T210000Z DTEND:20150218T220000Z DTSTAMP:20260828T094430Z UID:8m741kk4tuqjo3q7g5al9mus50@google.com CREATED:20150210T212215Z DESCRIPTION:Speaker Name: Dr. Robert Wicks\n\nSpeaker Institution : NASA Go ddard/University of Maryland\n\nTitle : A proton cyclotron wave storm gener ated by unstable proton distribution functions in the solar wind\n\nAbstrac t: We use 0.092 s cadence magnetometer data from the Wind spacecraft to id entify waves with amplitudes > 0.1 nT near to the ion gyro frequency (~ 0.1 Hz) with duration longer than one hour during 2008. We present one of the most common types of event for a case study and find it to be a proton cycl otron wave storm\, coinciding with highly radial magnetic field and a supra -thermal proton beam close in density to the core distribution itself. Usin g linear Vlasov analysis we conclude that the long duration\, large amplitu de waves are generated by the instability of the proton distribution functi on. The origin of the beam is unknown but the radial field period is found in the trailing edge of a fast solar wind stream and resembles other events thought to be caused by magnetic field foot-point motion or interchange re connection between coronal holes and closed field lines in the corona.\n LAST-MODIFIED:20150210T212215Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150508T160000Z DTEND:20150508T170000Z DTSTAMP:20260828T094430Z UID:tl8j58of50m0rpts6hgbi1ir3o@google.com CLASS:PUBLIC CREATED:20150501T124601Z DESCRIPTION:​Speaker Name: Dvir Kafri\n\nSpeaker Institution: JQI\n \nTitl e: Quantum Interfaces between Ions and Circuits\n\nAbstract: It is expected that future quantum information processors will be hybrid systems. Such sy stems will use the distinct advantages of different physical systems to imp lement different components of a quantum computing architecture. The long c oherence times of trapped ions along with the fast gate times of supercondu cting circuits make them promising candidates for such devices. Unfortunate ly\, these systems display a large mismatch in characteristic frequencies\, rendering standard Coulombic interactions ineffective at coherently transf erring information between them. In this talk I'll describe two related tec hniques for coupling a trapped ion’s motion to the fundamental mode of a su perconducting circuit. In order to overcome the resonance mismatch\, we eff ectively modulate either the inductance or capacitance of the circuit. Stu dying the motion of the corresponding classical oscillator\, I will show ho w to add sidebands to the circuit's charge fluctuations that are resonant w ith the ion's motion. This allows for an effective `beam-splitter'-like int eraction between the systems\, with coupling strengths on the order of 10's of kHz. We find a generic expression for the coherent coupling strength\, showing that an inductive drive is significantly weaker than capacitive dri ving when the ion and circuit are coupled.\n\n\n​IMPORTANT NOTE- Free Lunch served at 11:45 LAST-MODIFIED:20150501T190202Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150611T180000Z DTEND:20150611T190000Z DTSTAMP:20260828T094430Z UID:9429821E-5EF7-457A-B47D-350A7008B992 CREATED:20150529T185324Z DESCRIPTION:Speaker Name: Renée-Andrée Koornstra\n\nSpeaker Institution : F oundation for Fundamental Research on Matter\, Netherlands \n\nTitle: Spec ial Seminar: Women in Physics in the Netherlands\n\nAbstract : About 25% of the PhD students and postdocs in physics in the Netherlands are female. St ill\, the overwhelming majority of the full professors (90%) in physics are men. There have been plenty of initiatives to promote women and their pros pects to pursue a career in physics\, but the presence of women higher up t he scientific ladder remains low. FOM\, the physics branch of the Netherlan ds Science Foundation\, is concerned about this issue. FOM thinks that a be tter gender balance will improve the quality of our organization and the qu ality of physics in the Netherlands\, and provide fairness to female physic ists in that they occupy more positions at the levels where decisions are b eing made. Therefore we have taken a number of actions to realize our goal: Women in 20% of our top management and research positions in the year 2020 . The current situation at FOM is only half of this.\n\nIn spite of several cultural and educational differences between our countries\, gender bias i n physics is surprisingly similar\, both in terms of participation and in t erms of problems encountered. This makes an exchange of ideas and of does a nd don'ts especially interesting.\n\nI will present our current initiatives and programmes so far (dos and don'ts\, lessons learned\, starter misstake s\, etc) and discuss the following items:\n1.What about a quorum? Positive discrimination or affirmative action? Empowering women? Women-only programm es? "Two body problem"? \n2.What can we learn from diversity experience in the US? --> Input and ideas for new initiatives in phyisics in the Netherla nds \n3.How can we become more effective in our actions and measures?\n\n\n \n LAST-MODIFIED:20150529T190023Z LOCATION: PSC 2136 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Special Seminar: Women in Physics in the Netherlands TRANSP:OPAQUE BEGIN:VALARM ACTION:NONE TRIGGER;VALUE=DATE-TIME:19760401T005545Z X-WR-ALARMUID:94D920A2-E204-49B4-A038-85220E61D9C3 UID:94D920A2-E204-49B4-A038-85220E61D9C3 X-APPLE-DEFAULT-ALARM:TRUE END:VALARM END:VEVENT BEGIN:VEVENT DTSTART:20141113T190000Z DTEND:20141113T203000Z DTSTAMP:20260828T094430Z UID:rfood6naq9rptjtnl85hsieaqk@google.com CREATED:20141030T162441Z DESCRIPTION:Speaker: Alexey Bezryadin\, University of Illinois\n\nTitle: Macroscopic Quantum Phenomena with Phase Slips and Superconducting Vortices \n\nAbstract: This talk combines two related topics: (1) quantum tunneling of Little-type phase slips and (2) quantum superposition states of Abrikos ov vortices. We will discuss two different mechanisms of the current decay\ , namely the thermal activation of Little’s phase slips [1] as well as quan tum tunneling of such phase slips [2\,3]. Experimentally\, we also find tha t under certain conditions\, namely under the condition of relatively weak supercurrent values\, the phase slips prefer to tunnel in pairs [4]. This q uantum pairing effect will be discussed in terms of the Caldeira-Leggett as well as Korshunov theories. In a separate set of experiments we look at th e behavior of transom qubits\, modified in such a way that Meissner current s control the energy of the qubit. Under these condition vortices\, if pres ent in the electrodes\, couple to the qubit energy rather strongly. The qua ntum superposition of the supercurrent in the qubit produces a quantum supe rposition of the Lorentz force acting on vortices. Thus we observe vortices existing in a quantum-coherent superpositions of shifts generated by the L orentz force. Such superpositions can survive over a time scale of many mic roseconds.\n\n1. W. A. Little\, Phys. Rev. 156\, 396 (1967).\n\n2. M. Sahu et al.\, Nature Physics 5\, 503 (2009).\n\n3. T. Aref\, A. Levchenko\, V. V akaryuk\, and A. Bezryadin\, Phys. Rev. B 86\, 024507 (2012).\n\n4. Andrey Belkin\, Maxim Belkin\, Victor Vakaryuk\, Sergey Khlebnikov\, Alexey Bezrya din\, to be published (arXiv:1406.5128 [cond-mat.supr-con]).\n\nHost: Dr. Vladimir Manucharyan\n\n\nJoin with Google Hangouts: https://hangouts.googl e.com/hangouts/_/physics.umd.edu/cnam-colloquium?hceid=bGJrNjYwYTc1YjhqaDdl azZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.rfood6naq9rptjtnl85hsiea qk&hs=121 LAST-MODIFIED:20141110T172357Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151124T190000Z DTEND:20151124T200000Z DTSTAMP:20260828T094430Z UID:pjbrund9fk9cl4a4dt6t37249o@google.com CLASS:PUBLIC CREATED:20151111T130549Z DESCRIPTION:Speaker Name: Vedika Khemani\n\nSpeaker Institution: Princeton\ n\nTitle: Dynamical Response of Many Body Localized Systems\n\nAbstract: M any-body localization (MBL) is the long sought-after generalization of Ande rson localization to interacting systems. Many-body localized systems fail to thermalize\, and display a variety of novel properties and phases that h ave no equilibrium analog. In this talk\, I will review our rapidly evolvin g understanding of the MBL phase before describing the eigenstate propertie s and dynamical response of these phases in some detail. \n\nIn particular\ , I will show how a slow local perturbation surprisingly induces a highly n on-local charge response despite the localized nature of the phase. This ef fect lies beyond linear response theory and has implications for numerous f ields\, including topological quantum computation in quantum Hall systems a nd quantum control in disordered environments. I will also discuss the low- frequency Kubo conductivity of MBL systems\, and discuss the crossover from the linear to the non-linear response regime with an emphasis on the time- scales and amplitudes of the drive\n\nHost: Sankar Das Sarma LAST-MODIFIED:20151120T144919Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar: Vedika Khemani Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160318T150000Z DTEND:20160318T160000Z DTSTAMP:20260828T094430Z UID:j9rpda6usd0co4v3rf2eutarts@google.com CREATED:20160219T155154Z DESCRIPTION:Speaker: Stuart Hadfield\n\nSpeaker Institution: Columbia Unive rsity\n\nTitle: Quantum Algorithms and Circuits for Scientific Computing\n\ nAbstract: Quantum algorithms for scientific computing require modules impl ementing fundamental functions\, such as inverses\, logarithms\, trigonomet ric functions\, and others. We require modules that have a well-controlled numerical error\, that are uniformly scalable and reversible (unitary)\, an d that can be implemented efficiently. Such modules are an important first step in the development of quantum libraries and standards for numerical co mputation.\n\nWe present quantum algorithms and circuits for computing the square root\, the natural logarithm\, and arbitrary fractional powers. We p rovide performance guarantees in terms of their worst-case accuracy and cos t. We further illustrate their performance by comparing to floating point i mplementations found in widely used numerical software.\n\n\nJoint work wit h Mihir K. Bhaskar\, Anargyros Papageorgiou\, and Iasonas Petras\n LAST-MODIFIED:20160219T155154Z LOCATION:3100 Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160308T180000Z DTEND:20160308T190000Z DTSTAMP:20260828T094430Z UID:o5bl1245ok5j97jljrhk2gn3bg@google.com CREATED:20160307T133625Z DESCRIPTION:speaker: Philipp Hauke \ninstitution: University of Innsbruck\n \nMeasuring multipartite entanglement via dynamic susceptibilities\n\nEntan glement is a cornerstone of modern quantum many-body theory. Experimentally \, however\, it is extremely difficult to observe\, especially multipartite entanglement. Here\, we show that the quantum Fisher information\, a witne ss for genuinely multipartite entanglement\, can be measured generically in thermal ensembles through the dynamical susceptibility. This connection\, which is independent of microscopic details\, makes multipartite entangleme nt accessible to experiments using standard techniques. Moreover\, it allow s us to identify a class of quantum phase transitions with strong universal scaling\, leading to divergent multipartite entanglement. We illustrate ou r framework with several numerical examples\, all realizable in ultracold-a tom experiments. LAST-MODIFIED:20160307T133631Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150414T150000Z DTEND:20150414T160000Z DTSTAMP:20260828T094430Z UID:9niavtmbf4bj22298to1tm7hh8@google.com CREATED:20150408T201344Z DESCRIPTION:Speaker: John Quinn (U. of Tennessee\, Knoxville)\n\nTitle: Cor relation Diagrams: an Intuitive Approach to Correlations in Quantum Hall Sy stems\n\nAbstract: See flier at http://www.physics.umd.edu/cmtc/seminars.ht ml\n\nHost: Bitan Roy\n\n LAST-MODIFIED:20150408T201344Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141001T200000Z DTEND:20141001T213000Z DTSTAMP:20260828T094430Z UID:1srfkcovq7jut9jlmi04hb23n4@google.com CREATED:20140926T142034Z DESCRIPTION:Speaker Name: Chunhui Chen\n\nSpeaker Institution: Iowa State U niversity\n\nTitle: "Production of High Transverse Momentum Vector Bosons R econstructed as Single Jets at ATLAS and its Application to Search for NP a t the LHC"\n\nAbstract: Highly boosted hadronically decaying particles have been widely used as a unique signature to search for NP at the LHC. In thi s talk\, we present a measurement of the cross-section for high transverse momentum W and Z bosons produced in pp collisions and decaying to all-hadro nic final states by ATLAS experiment. The measurement is performed by recon structing boosted W or Z bosons in single jets. The reconstructed jet mass is used to identify the W and Z bosons\, and a jet substructure method base d on energy cluster information in the jet center-of-mass frame is used to suppress the large multi-jet background. In this talk\, we will also discus s potential applications of the jet substructure in the jet rest frame in s earches for NP at the LHC.\n\n\nJoin with Google Hangouts: https://hangouts .google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZq cjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.1srfkcovq7jut9jlmi04hb23n4&h s=121 LAST-MODIFIED:20140926T142230Z LOCATION:PSC Room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151005T200000Z DTEND:20151005T210000Z DTSTAMP:20260828T094430Z UID:a0hr5qa4dmf6nnmntmh5n918ac@google.com CREATED:20151001T125310Z DESCRIPTION:Your E-Mail: jkomianos@gmail.com\nResearch Group/Institution : Biophysics\nType of Event : Colloquia/Seminar\nDate of Event: 2015-10-12\nS tart: 04:00 PM\nEnd: 05:00 PM\nLocation: 0112 CHEM\nTitle : Simulation of Mechanical Properties of Membranes\nSpeaker Name: Richard Pastor\nSpeaker I nstitution : NIH\n\n LAST-MODIFIED:20151001T125528Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140508T190000Z DTEND:20140508T200000Z DTSTAMP:20260828T094430Z UID:ab5g8267r5oul2pdcuvst41odg@google.com CREATED:20140505T195301Z DESCRIPTION:Speaker: Paul Green (UMCP)\nAbstract: More on super-Riemann sur faces and conformal field theory. LAST-MODIFIED:20140505T195301Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Super-Riemann surfaces\, Part 3 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151104T160000Z DTEND:20151104T173000Z DTSTAMP:20260828T094430Z UID:rhuk3i7k9uie13uci01qs4lfps@google.com CREATED:20151028T174926Z DESCRIPTION:Speaker Name: Younghyun Kim \n\nSpeaker Institution: UCSB\n\nT itle: Topological superconductivity in a multichannel Yu-Shiba-Rusinov chai n\n\nAbstract: Chains of magnetic atoms placed on the surface of an s-wave superconductor with large spin-orbit coupling provide a promising platform for the realization of topological superconducting states characterized by the presence of Majorana zero-energy modes. In a recent work\, we study the properties of one-dimensional chains of Yu-Shiba-Rusinov states induced by magnetic impurities using a realistic model for the magnetic atoms that in cludes the presence of multiple scattering channels. These channels are mix ed by spin-orbit coupling and\, via the hybridization of the Yu-Shiba-Rusin ov states at different sites of the chain\, result in a multi–band structur e for the chain. We obtain the topological phase diagram for such band stru cture and show that the inclusion of higher bands can greatly enlarge the p hase space for the realization of topological states.\n\nHost: Will Cole\n\ nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151030T185604Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160328T190000Z DTEND:20160328T210000Z DTSTAMP:20260828T094430Z UID:ugj40nnffkvav2nmpisrd8lnrs@google.com CREATED:20160307T141149Z DESCRIPTION:Speaker: Michael Jarret Baume\n\nSpeaker Affiliation: QuICS\n\n Title: Spectral graph theory with applications to quantum adiabatic optimiz ation\n\nAbstract: Quantum adiabatic optimization (QAO) slowly varies an in itial Hamiltonian with an easy-to-prepare ground-state to a final Hamiltoni an whose ground-state encodes the solution to some optimization problem. Cu rrently\, little is known about the performance of QAO relative to classica l optimization algorithms as we still lack strong analytic tools for analyz ing its performance. In this talk\, I will unify the problem of bounding th e runtime of one such class of Hamiltonians -- so-called stoquastic Hamilto nians -- with questions about functions on graphs\, heat diffusion\, and cl assical sub-stochastic processes.\n\nThrough a discussion of Cheeger inequa lities\, I will describe how the geometry of the ground-state is in one-to- one correspondence with the spectral gap of the corresponding Hamiltonian\, and hence the runtime of both QAO and certain classical monte carlo techni ques. Then\, I will introduce new tools for bounding the spectral gap of st oquastic Hamiltonians and\, by exploiting heat diffusion\, show that one of these techniques also provides an optimal and previously unknown gap bound for a large class of graphs. Additionally\, these methods suggest a novel\ , typically efficient classical simulation algorithm for QAO\, sub-stochast ic monte carlo. LAST-MODIFIED:20160328T133255Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Ph.D. Defense - Michael Jarret Baume TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140212T183000Z DTEND:20140212T200000Z DTSTAMP:20260828T094430Z UID:e834u4vhfrck7ts3hn9d41a6so@google.com CREATED:20140116T164539Z DESCRIPTION:Title: A Galactic Scale Gravitational Wave Observatory\n\nSpeak er: Maura McLaughlin\, WVU\n\nAbstract: Timing an array of pulsars could re sult in the detection of a stochastic gravitational wave background\, most likely resulting from an ensemble of supermassive black hole binaries\, and is already constraining models for galaxy formation and the tension of cos mic strings. Pulsar timing arrays are also sensitive to continuous and burs t gravitational wave sources. I will give an overview of the observational strategies and detection algorithms used for these various source classes. I will then describe the efforts of the North American Nanohertz Observator y for Gravitational Waves (NANOGrav)\, a collaboration which monitors an ar ray of over 40 millisecond pulsars with the Green Bank Telescope and Arecib o Observatory. I will describe the dramatic gains in sensitivity that are e xpected from discoveries of many new millisecond pulsars\, more sensitive i nstrumentation\, improved detection algorithms\, and international collabor ation and discuss the likely time to gravitational wave detection using pul sar timing under various scenarios. LAST-MODIFIED:20140211T205708Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120307T160000Z DTEND:20120307T170000Z DTSTAMP:20260828T094430Z UID:tk8d162kb48bedcfb95r0ql088@google.com CREATED:20120305T152654Z DESCRIPTION:Speaker: Maissam Barkeshli\nInstitution: Stanford University\nT itle: Topological Nematic States and Non-Abelian Lattice Dislocations\nAbst ract: An exciting prospect in condensed matter physics is the\npossibility of realizing fractional quantum Hall (FQH) states in simple\nlattice models without a large external magnetic field. A fundamental\nquestion is whethe r qualitatively new states can be realized on the\nlattice as compared with ordinary fractional quantum Hall states. Here we\npropose new symmetry-enr iched topological states\, "topological nematic\nstates\," which are a dram atic consequence of the interplay between the\nlattice translation symmetry and topological properties of these\nfractional Chern insulators. When a p artially filled flat band has a Chern\nnumber N\, it can be mapped to an N- layer quantum Hall system. We find that\nlattice dislocations can act as wo rmholes connecting the different layers\nand effectively change the topolog y of the space. Lattice dislocations\nbecome defects with non-trivial quant um dimension\, even when the FQH state\nbeing realized is by itself Abelian . Our proposal leads to the possibility\nof realizing the physics of topolo gically ordered states on high genus\nsurfaces in the lab even though the s ample has only the disk geometry. LAST-MODIFIED:20120305T152701Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131121T173000Z DTEND:20131121T183000Z DTSTAMP:20260828T094430Z UID:cqde4f0jqn51r4h4o6br6qinuo@google.com CREATED:20131114T144349Z DESCRIPTION:Location: IREAP Large Conference Room\, ERF 1207\n\nTitle : Sta bility of Boolean networks: The joint effects of topology and update rules\ n\nSpeaker Name: Shane Squires\n\nSpeaker Institution : UMD\n\nAbstract : B oolean networks\, a widely used model of gene regulatory networks\, are kno wn to exhibit a phase transition between a stable regime\, in which small p erturbations die out\, and an unstable regime\, in which small perturbation s grow exponentially. This talk will address the stability of orbits in la rge Boolean networks with given complex topology. Recent past work has add ressed the separate effects of network topology and certain special classes of update rules on stability\, but only crude results exist about how thes e effects interact. We present a widely applicable solution to this proble m\, imposing no restrictions on the form of the update rules\, which may be correlated with local topological properties of the network. Numerical ex periments confirm our theory and show that local correlations between topol ogy and update rules can have profound effects on the qualitative behavior of these systems.\n LAST-MODIFIED:20131114T144349Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150205T173000Z DTEND:20150205T183000Z DTSTAMP:20260828T094430Z UID:h7lggspts5ert4eqf358iq9png@google.com CREATED:20150203T193635Z DESCRIPTION:2 30-minute presentations: \n\nTalk 1: Stimulated Brillouin Sca ttering Suppression and Coherent Laser Combination using Chirped Diode Lase rs\nSpeaker: Rafael Setra (UMD)\n\nTalk 2: Transition from Noisy to Determi nistic Dynamics in a Spatio-Temporal System: Stimulated Brillouin Scatterin g in an Optical Fiber \nSpeaker: Dr. Jeffrey White (ARL) \n LAST-MODIFIED:20150203T193635Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160509T170000Z DTEND:20160509T180000Z DTSTAMP:20260828T094430Z UID:edqbso1ptvlk1d091r2p34u138@google.com CREATED:20160404T131740Z DESCRIPTION:Speaker: Robin Kothari\n\nSpeaker Affiliation: MIT\n\nTitle: Se parations in query complexity using cheat sheets\n\nAbstract: We show a pow er 2.5 separation between bounded-error randomized and quantum query comple xity for a total Boolean function\, refuting the widely believed conjecture that the best such separation could only be quadratic (from Grover's algor ithm). We also present a total function with a power 4 separation between q uantum query complexity and approximate polynomial degree\, showing severe limitations on the power of the polynomial method. Finally\, we exhibit a t otal function with a quadratic gap between quantum query complexity and cer tificate complexity\, which is optimal (up to log factors). These separatio ns are shown using a new\, general technique that we call the cheat sheet t echnique. The technique is based on a generic transformation that converts any (possibly partial) function into a new total function with desirable pr operties for showing separations. The framework also allows many known sepa rations\, including some recent breakthrough results of Ambainis et al.\, t o be shown in a unified manner.\n\nThis is joint work with Scott Aaronson a nd Shalev Ben-David\n LAST-MODIFIED:20160404T131740Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140312T150000Z DTEND:20140312T163000Z DTSTAMP:20260828T094430Z UID:tvckn9a9d1ibo8a986ngfqv2qc@google.com CREATED:20140307T183939Z DESCRIPTION:Speaker: Maissam Barkeshli\n\nInstitution: Microsoft Station Q\n\nTitle: Defects: A New Window Into Topological Order\n\nAbstract: Topol ogically ordered states\, such as the fractional quantum Hall (FQH) states\ , are quantum states of matter with various exotic properties\, including q uasiparticles with fractional quantum numbers and fractional statistics\, a nd robust topology-dependent ground state degeneracies. In this talk\, I wi ll describe a new aspect of topological states: their extrinsic defects. Th ese include extrinsically imposed point-like or line-like defects that coup le to the topological properties of the state in non-trivial ways. The extr insic point defects localize topologically protected "parafermion" zero mod es\, which generalize the notion of Majorana fermion zero modes\, and provi de a new direction for realizing non-Abelian quantum statistics and topolog ical quantum computation. The line defects allow direct quantum mechanical coupling between electrons and fractionalized anyons\, leading to new ways to probe fractionalization. After describing the conceptual framework\, I w ill focus on a specific set of experimental proposals\, using conventional bilayer FQH states\, to detect parafermion zero modes and to directly obser ve the long-predicted topological ground state degeneracy of FQH states. \n \nHost: Jay Deep Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140310T134017Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151216T210000Z DTEND:20151216T223000Z DTSTAMP:20260828T094430Z UID:j4do68r6oiq50ai13mohkbbpi4@google.com CREATED:20151209T140447Z DESCRIPTION:Speaker: Alexander Ridgway\n\nSpeaker Institution: Cal Tech\n\n Title: Spherically Symmetric Kerr-Schild Metrics and the Classical Double C opy\n\nAbstract: In the last 20 years the amplitudes program has had succe ss at revealing hidden structures in perturbative gauge theories that are n ot obvious in a local Lagrangian formulation. One notable example is the B CJ duality and perturbative double copy\, which states that the n-point gra viton amplitude can be derived from the n-point Yang-Mills one. A natural question to ask is does this perturbative duality manifest itself in other aspects of the theories? Recent work suggests the classical solutions of G ravity and Electromagnetism exhibit similar double copy structure. Specifi cally\, there is a mapping between Kerr-Schild metrics and E&M vector poten tials that is reminiscent of the perturbative double copy. I will review t his relationship\, which I refer to as the “Classical Double Copy”\, extend it to the class of spherically symmetric systems and relate the sources on either side of the double copy. I will also show that the double copies o f spherically symmetric charge distributions do not always satisfy the ener gy conditions. LAST-MODIFIED:20151209T140447Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151027T183000Z DTEND:20151027T200000Z DTSTAMP:20260828T094430Z UID:tkoeouc37k623hffkaigthfeqo@google.com CREATED:20151027T145742Z DESCRIPTION:Special\, Impromptu EPT Seminar\nSorry for the late notice\, bu t this just came together today!\n\nSpeaker: Nima Arkani-Hamed\n\nSpeaker I nstitution: IAS\, Princeton\n\nTitle: "Cosmological Polytopes" LAST-MODIFIED:20151027T145754Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140417T180000Z DTEND:20140417T193000Z DTSTAMP:20260828T094430Z UID:65puk7kgvm94llovts9dolv0h0@google.com CREATED:20140406T024654Z DESCRIPTION:Speaker: Brad Ramshaw\, Los Alamos National Lab\n\nTitle: Fer mi surface measurements approaching the quantum critical point at the heart of high temperature superconductivity in YBa2Cu3O6+x\n\nAbstract: There ha s been a lot of activity recently regarding broken symmetries in the underd oped cuprates\, including the observation of charge order and a new interpr etation of the onset of Kerr rotation. Still unresolved is whether these br oken symmetries are associated with a quantum critical point near optimal d oping\, and further\, whether such a quantum critical point enhances superc onductivity. Previous quantum oscillation studies have shown that the quasi particle g-factor is consistent with charge rather than spin-order reconstr uction of the Fermi surface\, but have been unable to access dopings above p~0.12. We show that\, on applying magnetic fields in excess of 92 T\, the metallic state of YBa2Cu3O 6+δ can be accessed almost up to optimal doping . We find that the quasiparticle effective mass diverges approaching a cri tical doping of p~0.18---direct evidence for a large region of fluctuations surrounding a ground-state change in symmetry. This quantum critical poin t is further found to lie within a small “island” of superconductivity that persists to magnetic fields above 80 telsa\, thus linking the region of st rongest quantum-critical fluctuations to the most robust high-temperature s uperconductivity. \n\n\nHost: Johnpierre Paglione LAST-MODIFIED:20140408T181352Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160210T160000Z DTEND:20160210T170000Z DTSTAMP:20260828T094430Z UID:dud4ju890eav45t376jqmlvhuk@google.com CREATED:20160114T185627Z DESCRIPTION:Speaker Name: Miguel Navascues\n\nSpeaker Affiliation: IQOQI-Vi enna\n\nTitle: The limits of Matrix Product State Models\n\nAbstract: For t he past twenty years\, Tensor Network States (TNS) have been widely used to model the low energy sector of local Hamiltonians. Their success in doing so has led to the wide-held mantra that TNS of low bond dimension are the ` only physical states' of natural condensed matter systems. However\, given our experimental limitations to interact with such systems\, it is not clea r how this conjecture translates into any observable effect. In this Letter we give a first step in this direction by identifying particular operation al features pertaining to all Matrix Product States (MPS)\, the class of TN S used to model non-critical one-dimensional spin chains. By exploiting two surprising structural constraints of MPS\, we show how to systematically d erive `bond dimension witnesses'\, or k-local operators whose expectation v alue allows us to lower bound the bond dimension of the underlying quantum state. We extend some of these results to the ansatz of Projected Entangled Pairs States (PEPS). As a bonus\, we use our insight on the structure of M PS to derive some limitations on the use of MPS and PEPS for ground state e nergy computations. LAST-MODIFIED:20160128T204239Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140305T183000Z DTEND:20140305T200000Z DTSTAMP:20260828T094430Z UID:5tjpb3tv3bmeoltrglgns418fg@google.com CREATED:20140219T212231Z DESCRIPTION:Title: The Origin of Titan and Hyperion\n\nSpeaker: Douglas Ham ilton\, UMD\n\nAbstract: Titan is arguably the Solar System's most unusual satellite. It is\nfifty times more massive than Saturn's other moons and is the only\nsatellite with a substantial atmosphere. Titan shares a unique\n resonance with nearby Hyperion\, but otherwise sits in a particularly\nlarg e gap between Rhea and Iapetus. Titan has the largest eccentricity\nof all Saturn's regular satellites and has a reasonably large orbital\ntilt\; its distant neighbor Iapetus has an even more impressive eight\ndegree free inc lination. Hyperion itself is a mystery\, with its\nunusual orbit\, extremel y low density and its unique surface covered\nwith bizarre craters. None of these peculiarities are even partially\nunderstood. Until now! LAST-MODIFIED:20140226T170610Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151116T110000 DTEND;TZID=America/New_York:20151116T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151116T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:D. J. Wineland\, NIST\, Boulder\n\nNuts and bolts for trapped-i on quantum information processing\n\nTrapped ions have demonstrated many of the basic elements of quantum information processing and have provided the most complex simulations to date\, as demonstrated by the groups of Chris Monroe and Rainer Blatt. In Boulder\, our recent work has focused on devel oping some of the infrastructure that will be required for scaling to large r numbers of qubits. This includes the development of UV-damage-resistant fibers\, superconducting single photon detectors (SCSPD’s)\, multi-species logic gates\, and alternative entanglement schemes. These and some related techniques will be discussed. \n LAST-MODIFIED:20151023T142557Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151029T180000Z DTEND:20151029T190000Z DTSTAMP:20260828T094430Z UID:n31vmt1b9839b6nhos0snt3moc@google.com CREATED:20151022T154954Z DESCRIPTION:Speaker: Ian Appelbaum\, UMD\n\nTitle: "Electronic and Spintro nic phenomena in a 'new' 2D semiconductor\, by symmetry\n"\n\nAbstract: The electronic structure of semiconducting (group-III) metal-monochalcogenide monolayers (such as GaSe) exhibits many unusual features. Some\, such as an unusually distorted upper valence band dispersion\, are primarily the resu lt of purely orbital interactions. Others\, including spin splitting and wa vefunction spin-mixing\, are directly driven by spin-orbit coupling. I will discuss how the wavefunction symmetries give rise to these features and th e phenomena enabled by them\, such as anisotropic spin relaxation\, conduct ion electron spin orientation via optical absorption\, and a relaxation-ind uced upper valence band population inversion and spin orientation mechanism . LAST-MODIFIED:20151024T125834Z LOCATION:Room 1201 John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Ian Appelbaum\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140113T173000Z DTEND:20140113T183000Z DTSTAMP:20260828T094430Z UID:j253oof4rvkfh5lmnjpoqurtv8@google.com CLASS:PUBLIC CREATED:20140109T203707Z DESCRIPTION:Speaker: Jörg Schmiedmayer\n\nInstitution: Vienna Center for Qu antum Science and Technology (VCQ)\, Atominstitut\, TU-Wien\n\nTitle: Does an isolated quantum system relax?\n\nAbstract:\nUnderstanding non-equilibri um dynamics of many-body quantum systems is crucial for many fundamental an d applied physics problems ranging from de-coherence and equilibration to t he development of future quantum technologies such as quantum computers whi ch are inherently non-equilibrium quantum systems.\n\nOne of the biggest ch allenges in probing non-equilibrium dynamics of many-body quantum systems i s that there is no general approach to characterize the resulting quantum s tates. Using the full distribution functions of a quantum observable [1\,2] \, and the full phase correlation functions allows us to study the relaxati on dynamics in one-dimensional quantum systems and to characterize the unde rlying many body states.\n\nInterfering two isolated one-dimensional quantu m gases we study how the coherence created between the two many body system s by the splitting process slowly dies by coupling to the many internal deg rees of freedom available. Two distinct regimes are clearly visible: for sh ort length scales the system is characterized by spin diffusion\, for long length scales by spin decay [3]. The system approaches a pre-thermalized st ate [4]\, which is characterized by thermal like distribution functions but exhibits an effective temperature over five times lower than the kinetic t emperature of the initial system. A detailed study of the correlation func tions reveals that these thermal-like properties emerge locally in their fi nal form and propagate through the system in a light-cone-like evolution [5 ]. Furthermore we demonstrate that the pre-thermalized state is connected t o a Generalized Gibbs Ensemble\, that its higher order correlation function s factorize and show the pathways for further relaxation towards thermal eq uilibrium.\n\nSupported by the Wittgenstein Prize\, the Austrian Science Fo undation (FWF) SFB FoQuS: F40-P10 and the EU through the ERC-AdG QuantumRel ax\n\n [1] A. Polkovnikov\, et al. PNAS 103\, 6125 (2006)\; V. Gritsev\, et al.\, Nature Phys. 2\, 705 (2006)\;\n\n[2] S. Hofferberth et al. Nature Ph ysics 4\, 489 (2008)\; \n\n[3] M. Kuhnert et al. Phys. Rev. Lett 110\, 0904 05 (2013).\n\n[4] M. Gring et al.\, Science 337\, 1318 (2012)\; D. Adu Smit h et al. NJP 15\, 075011 (2013).\n\n[5] T. Langen et al. Nature Physics 9\, 640–643 (2013).\n LAST-MODIFIED:20140109T203707Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160321T203000Z DTEND:20160321T213000Z DTSTAMP:20260828T094430Z UID:413g5njmo9iq8u74n8algn5g30@google.com CREATED:20160321T133920Z DESCRIPTION:Speaker Name: Steffen Krakau / Ulrich Kolberg\n\nSpeaker Instit ution : Ruhr University\n\nAbstract: On the beam induced quasi-instability transformation of the damped aperiodic mode in the IGM / Plasma effects on extragalactic ultra-high energy cosmic ray hadron beams in cosmic voids LAST-MODIFIED:20160321T144918Z LOCATION:2400 CSS (Building 224) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160204T203000Z DTEND:20160204T220000Z DTSTAMP:20260828T094430Z UID:r74n4mheggkchncok8qrufcs6g@google.com CREATED:20160129T202003Z DESCRIPTION:Speaker: Chuck Doran (Alberta and UMCP) - \n LAST-MODIFIED:20160129T202003Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mirror Symmetry (cont.) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160301T181500Z DTEND:20160301T193000Z DTSTAMP:20260828T094430Z UID:3sjha1bpofutk1b19iq3rfppvo@google.com CREATED:20160226T152531Z DESCRIPTION:Speaker Name: Rebecca Schulman\n\nSpeaker Institution : Johns H opkins University\n\nTitle: Studying self-replication and adaptive self-as sembly with DNA hybridization-driven self-assembly\n\nAbstract : Within cel ls\, self-assembly processes propagate and replicate information and respon d to environmental cues through dynamic reorganization. A fundamental quest ion is how kinetic processes involving biomolecules\, which are inherently stochastic and must function despite variations in chemical concentrations and physical conditions can exhibit these capacities. My research group has been studying this question using dynamic DNA self-assembly processes.\n\n I will first discuss the design and realization of an autonomous\, enzyme-f ree system to replicate sequences within ribbon crystals using a chemical a lphabet consisting of DNA "tile" monomers. We control the mutation rate by designing the crystal monomers so that information copying during growth is "proofread\," and can similarly alter the nucleation rate by designing the components to have a specific critical nucleus.\n\nI will then describe ne wer work studying "adaptive" self-assembly\, specifically how! kinetic proc esses can measure properties of the physical environment and self-assemble a structure that takes these measurements into account. We have recently co nsidered the question of how filaments might assemble specifically between two fixed molecular "landmarks" whose separation distance and orientation a re not known in advance. I will show how a tradeoff between polymer growth and diffusion can be used to assemble such structures\, effectively measure the distance\, and the tradeoffs that are involved in assembly. \n LAST-MODIFIED:20160226T152719Z LOCATION:IPST building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151027T171500Z DTEND:20151027T183000Z DTSTAMP:20260828T094430Z UID:6pqe2c26u03cc0kk7dmom8uvng@google.com CREATED:20151022T132936Z DESCRIPTION:Speaker Name: Toshiko Ichiye\n\nSpeaker Institution : Georgetow n University\n\nTitle & Abstract: TBA\n LAST-MODIFIED:20151022T133115Z LOCATION:IPST Building\, Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141105T180000Z DTEND:20141105T193000Z DTSTAMP:20260828T094430Z UID:dp49sd24ad9n0vvmuhdi862j3g@google.com CREATED:20141015T132116Z DESCRIPTION:Title: Massive and massless modes of the triplet phase of neutr on matter\n\nSpeaker: Srimoyee Sen\, UMD\n\nAbstract: Neutron matter at den sities of the order of the nuclear saturation density is believed to have n eutrons paired in the 3P2 channel. We study the low lying modes of this pha se and find two massless modes (angulons)\, resulting from the spontaneous breaking of rotational symmetry as well as three other\, gapped modes. We c ompute their masses at arbitrary temperatures. We also estimate the neutrin o emissivity of the goldstone modes in the presence of a magnetic field.\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/nuclear-physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY 2FsZW5kYXIuZ29vZ2xlLmNvbQ.dp49sd24ad9n0vvmuhdi862j3g&hs=121 LAST-MODIFIED:20141029T183822Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141110T200000Z DTEND:20141110T213000Z DTSTAMP:20260828T094430Z UID:dgd4hifioe854495orclhutf04@google.com CREATED:20140819T135048Z DESCRIPTION:Speaker Name: Michael Graesser\n\nSpeaker Institution: Los Alam os National Laboratory\n\nTitle: Hunting Asymmetric Stop Decays at the LHC\ n\nAbstract: Searching for top squarks at the LHC is a top priority. I will present a new decay channel and kinematic variable that increases the sens itivity of the 8 TeV LHC searches for top squarks. Projections for the 14 T eV run will also be presented.\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1Yjhq aDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.dgd4hifioe854495orcl hutf04&hs=121 LAST-MODIFIED:20141107T195616Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151015T163000Z DTEND:20151015T173000Z DTSTAMP:20260828T094430Z UID:j3ec04oebvqlhq2ji642hfslgg@google.com CREATED:20151001T184919Z DESCRIPTION:From oscillating candles to complex spatiotemporal arrhythmias in the heart\nProf. Flavio Fenton\nGeorgia Tech\, School of Physics LAST-MODIFIED:20151001T184919Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160308T181500Z DTEND:20160308T193000Z DTSTAMP:20260828T094430Z UID:kldmk3aog9i58t6puicb8rqfc8@google.com CREATED:20160301T153939Z DESCRIPTION:Speaker Name: Jeff Chen\n\nSpeaker Institution : University of Waterloo\n\nTitle : The Physics of semiflexible polymer chains\n\nAbstract : We present a summary of the current understanding in formulating a calcul ation for the free energy and phase diagram through a single-chain Green's function theory and multi-chain self-consistent field theory. The wormlike- chain formalism has the capability to capture physical features in a length scale smaller than the persistence length and in a length scale larger tha n its total chain length. It also builds the orientational dependence in th e foundation of the formalism\, which can be used to describe the coupled o rientational and positional dependencies of many polymer problems. It has t he advantage over a typical Gaussian-chain formalism for description of the physical properties where these features are the main concerns. However\, the mathematical treatment of a wormlike-chain model is much more complicat ed than that of a Gaussian-chain model\, due to the coupling between the or ientational and positional degrees of freedom. It is this coupling that giv es rise ! to physical features that are unique in semiflexible-chain system s. Example applications of the theoretical framework are also described her e\, for calculating the free energy and conformational properties of a conf ined long wormlike chain\, for describing the orientational defect structur es of confined liquid crystals\, and for demonstrating the orientation-indu ced surface wetting phenomenon. \n\nNotes: By tradition\, each seminar is p receded by an informal cafeteria lunch to which all are welcome\, departing from Room 1108 about five minutes after 12:00 noon. LAST-MODIFIED:20160301T154219Z LOCATION:IPST building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150403T163000Z DTEND:20150403T213000Z DTSTAMP:20260828T094430Z UID:3ssm72crtltqmq24vqce024qss@google.com CREATED:20150325T160402Z DESCRIPTION:JSI Mini-Symposium -- April 3\, 2015\n \n"Energetic Particles"\ nSchedule at http://jsi.astro.umd.edu/upcoming-mini-symposium\n \nDate: Fri day\, April 3\, 2015\nTime: 12:30 PM - 5:30 PM (Lunch available beginning a t 11:30 am in the ellipse area outside of PSC 1136)\nLocation: Room 1136 Ph ysical Sciences Complex\, University of Maryland\, College Park LAST-MODIFIED:20150325T160402Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151104T190000Z DTEND:20151104T220000Z DTSTAMP:20260828T094430Z UID:65un4bp6oq8b41r8nqv88ke5v4@google.com CLASS:PUBLIC CREATED:20151026T174548Z DESCRIPTION:Speaker Name: Rangga Budoyo\n \nDissertation Title: Effects of Optical Illumination on Superconducting Quantum Devices\n \nLocation: PSC 2 136\n \nDissertation Committee Chair: Prof. Frederick Wellstood\n \nCommitt ee: \nDr. Christopher Lobb\nDr. Steven Anlage\nDr. Luis Orozco\nDr. John Cu mings\n \nAbstract:Understanding the effect of optical illumination inciden t on a superconducting quantum device is important in building a hybrid qua ntum system where a superconducting qubit is coupled to optically trapped a toms. I report measurements of two different types of superconducting devic es illuminated by 780 nm light\, one of the wavelengths needed for trapping atoms in the proposed hybrid system.\n \nI illuminated an isolated thin-fi lm superconducting Al lumped-element microwave resonator and observed the r esonator quality factor and resonance frequency as a function of illuminati on intensity and microwave power in the 25 mK to 300 mK temperature range. The resonator was mounted in a 3d Al cavity with a TE101 mode frequency of 7.501 GHz and an external Q of 1.3 × 105. The external quality factor of th e LC resonator to the microwave input and output lines was Qe ≈ 5 × 109. At the base temperature of 25 mK\, the resonance frequency of the LC resonato r was 6.720 GHz and the highest quality factor Q was about 2 × 106. Two opt ical fibers were inserted into the cavity and provided 780 nm light to illu minate the resonator.\n \nThe optically-induced microwave loss increased wi th increasing illumination intensity but decreased with increasing microwav e power. The variation in Q due to microwave power was very similar to the behavior expected for loss from a distribution of two-level systems. Althou gh this behavior may suggest the presence of optically activated two-level systems\, I found that the loss is better explained by the presence of none quilibrium quasiparticles generated by the illumination and excited by the microwave drive. I described a model of the system that assumes that optica l absorption creates an effective source of phonons with energy higher than twice the superconducting gap and solved the coupled quasiparticle-phonon rate equations. I fit the simulation results to the measurements and found good agreement with the observed dependence of the resonator quality factor and frequency shift on temperature\, microwave power\, and optical illumin ation.\n \nI then fabricated an Al/AlOx/Al transmon qubit with a |g⟩ → |e⟩ transition frequency of 5.10 GHz and studied the qubit transition frequency and relaxation time as a function of illumination intensity and temperatur e between 10 mK and 265 mK. The qubit was mounted in a 3d Al cavity with ba re TE101 mode frequency of 6.127 GHz and coupled to the cavity with couplin g strength g/2π ≈ 119 MHz. One optical fiber was inserted into the cavity a nd provided 780 nm light to illuminate the resonator.\n \nQubit relaxation showed non-exponential behavior which I fit to a quasiparticle fluctuation model with two characteristic times\, where T1\,q is the shorter characteri stic time and T1\,r is the longer characteristic time. I found T1\,q ≈ 1.2 μs and T1\,r ≈ 25 μs at 10 mK and no optical illumination. Both relaxation times decreased with increasing illumination intensity. Initially T1\,q sli ghtly increased while T1\,r decreased with increasing temperature. Above ab out 130 mK\, the relaxation measurements revealed a simple exponential with a single decay time T1.\n \nFor comparison\, I described a model for the e xpected frequency shift and relaxation time due to quasiparticle tunneling through the Josephson junction\, with the quasiparticle distribution given by the nonequilibrium distribution induced by the illumination. While the q uasiparticle simulation predicted the general qualitative behavior of the f requency shift and relaxation time\, there were some significant discrepanc ies with the data. This suggests the model needs to be extended\, for examp le by including a different gap in the two superconductor layers forming th e junction\, and by taking into account other possible sources of loss and decoherence.\n \nExamination of the quasiparticle model reveals approaches to reducing optically-induced loss and improving the relaxation time of sup erconducting quantum devices\, including shielding the device from backgrou nd radiation as well as high energy phonons\, minimizing the kinetic induct ance ratio to reduce the sensitivity of loss and frequency shift to tempera ture changes and optical illumination\, and using quasiparticle traps. LAST-MODIFIED:20151030T185637Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Notice of Doctoral Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141031T173000Z DTEND:20141031T183000Z DTSTAMP:20260828T094430Z UID:58q61ehki90v50snlo67jhif2k@google.com CREATED:20141030T135428Z DESCRIPTION:Speaker Name: Nima Arkani-Hamed\n\nSpeaker Institution: IAS\, P rinceton\n\nTitle: Cosmological Collider Physics\n\nAbstract: TBA\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.e du/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29v Z2xlLmNvbQ.58q61ehki90v50snlo67jhif2k&hs=121 LAST-MODIFIED:20141030T140117Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150212T153000Z DTEND:20150212T163000Z DTSTAMP:20260828T094430Z UID:ndett8055l974p474vl3jnef10@google.com CLASS:PUBLIC CREATED:20150212T144734Z DESCRIPTION:Speaker- Nathalie de Leon\, Department of Physics\, Harvard Uni versity\n\nTitle- Diamond nanophotonics for solid state quantum optics\n\nA bstract- Large-scale quantum networks will require efficient interfaces bet ween photons and stationary quantum bits. Nitrogen vacancy (NV) centers in diamond are a promising candidate for quantum information processing becaus e they are optically addressable\, have spin degrees of freedom with long c oherence times\, and as solid-state entities\, can be integrated into nanop hotonic devices. An enabling feature of the NV center is its zero-phonon li ne (ZPL)\, which acts as an atom-like cycling transition that can be used f or coherent optical manipulation and read-out of the spin. However\, the ZP L only accounts for 3-5% of the total emission\, and previously demonstrate d methods of producing high densities of NV centers yield unstable ZPLs.\n I will present methods and technologies for gaining both spectral and spati al control over NV emission by coupling NV centers to nanophotonic devices. In particular\, we have developed a method to create a high-density device layer of NVs with stable ZPLs in high purity diamond\, and have devised a fabrication scheme to carve single mode waveguides out of the surface of th e bulk diamond substrate. Using this technique\, we are able to fabricate h igh quality factor\, small mode volume photonic crystal cavities directly o ut of diamond\, and deterministically position these photonic crystal cavit ies so that a stable NV center sits at the maximum electric field. We obser ve an enhancement of the spontaneous emission at the cavity resonance by a factor of up to 100. The NV emission is guided efficiently into a single op tical mode\, enabling integration with other photonic elements\, as well as networks of cavities\, each with their own optically addressable qubit. Th ese nanophotonic elements in diamond will provide key building blocks for q uantum information processing such as single photon transistors\, enabling distribution of entanglement over quantum networks. LAST-MODIFIED:20150212T144734Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SPECIAL SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151028T210000Z DTEND:20151028T230000Z DTSTAMP:20260828T094430Z UID:ovanm2afdljvip9ub54769a0qg@google.com CREATED:20151014T131853Z DESCRIPTION:Research Fair is a way to expose freshmen and sophomores to the breadth of research going on in our physics department and the plethora of research opportunities available to students. We hope that this year’s Res earch Fair will provide students a relaxed and inviting environment in whic h to interact with professors\, encouraging and make it easier for them to get into research earlier in their college careers. LAST-MODIFIED:20151014T131853Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Undergraduate Research Fair TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150504T200000Z DTEND:20150504T210000Z DTSTAMP:20260828T094430Z UID:anml2bb8bs686rdef8sdjblbko@google.com CREATED:20150421T180322Z DESCRIPTION:Speaker Name: Alex Groisman\n\nSpeaker Institution : University of California-San Diego\n\nTitle: New microfluidic devices and materials for chemotaxis and mechanobiology\n\nChemotaxis of adherent cells in gradie nts of chemoattractants is an important process in inflammation and develop ment. Microfluidic devices provide gradients with various well-defined shap es\, making it possible to study chemotaxis quantitatively. I will present results of studies of chemotaxis of popular model organisms\, the social am oeba\, D. discoideum\, and neutrophil-like HL60 cells\, using various micro fluidic devices built in my lab. These experiments tested the mechanisms of chemotactic response\, limits of chemotactic sensitivity\, and roles of sp atial and temporal cues in the chemotaxis. Many types of mammalian cells in their native environments are exposed to periodic stretching that is a str ong mechanical cue. I will present a microfabricated device\, in which cell s plated on a thin elastomeric membrane are stretched by up to 15%\, while being continuously monitored under a high resolution fluorescence microscop e with widefield\, confocal\, or TIRF illumination. Finally\, I will presen t experiments on adherent mammalian cells plated on thin layers of soft sil icone gels with high refractive indexes. Mechanical forces exerted by cells on the substrates are measured using traction force microscopy\, and fluor escent biomarkers in the cell adhesion complexes are visualized with TIRF m icroscopy\n LAST-MODIFIED:20150421T180322Z LOCATION:Marker Seminar Room\, 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150408T190000Z DTEND:20150408T200000Z DTSTAMP:20260828T094430Z UID:hrefrhdbsj0ifi0coh3v8fv8d0@google.com CLASS:PUBLIC CREATED:20150401T121334Z DESCRIPTION:Speaker Name: Wade DeGottardi\n\nSpeaker Institution: Argonne N ational Laboratory\n\nTitle: Topological 1D Systems\n\nAbstract: In this ta lk\, I will present recent theoretical work on the topological properties o f a selection of 1D systems. Examples include p-wave superconductors\, Majo rana chains as well as chains composed of more exotic objects such as Fibon acci anyons. For the case of p-wave superconductors\, I will discuss the fa te of Majorana end modes in the presence of periodic\, quasiperiodic\, and disordered potentials. Chains composed of a variety of non-Abelian anyons h ost topologically protected end modes. I will present a method of analyzing such systems based on boundary conformal field theory. Finally\, I will di scuss efforts by the Kwok group at Argonne to observe Majorana fermions in topological insulating nanowires which exploits topological features of cou pled Majorana chains. LAST-MODIFIED:20150403T150137Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Talk by Wade DeGottardi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140917T200000Z DTEND:20140917T213000Z DTSTAMP:20260828T094430Z UID:alcgsbiicim9sor8clfljmq06s@google.com CREATED:20140917T134526Z DESCRIPTION:Speaker Name: Kaustubh Agashe\n\nSpeaker Institution: Universit y of Maryland\n\nTitle: "Using Energy-peaks to Measure Particle (new and ol d) Masses"\n\nAbstract : I will first analytically show a simple\, yet subt le\, "invariance" of two-body decay kinematics for the case of a massless d aughter and a mother particle which is unpolarized and has a generic boost distribution in the laboratory frame. Namely\, the laboratory frame energy distribution of the massless decay product has a peak\, whose location is identical to the (fixed) energy of that particle in the rest frame of the c orresponding mother particle. In turn\, this value of the energy is a simp le function of the other masses involved in the decay. As a proof of princi ple of the usefulness of this observation\, I will then apply it for measur ing the mass of the top quark at the LHC\, suing simulated data (including experimental effets.). Finally\, I will show hoe it can be used to measure all the superpartner masses in a cascade decay chain of the gluino.\n\n\nJ oin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.um d.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ 29vZ2xlLmNvbQ.alcgsbiicim9sor8clfljmq06s&hs=121 LAST-MODIFIED:20140917T135921Z LOCATION:PSC Room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160128T190000Z DTEND:20160128T203000Z DTSTAMP:20260828T094430Z UID:7qh7gf40m81jhsh35g6t1bmc0s@google.com CREATED:20160123T162847Z DESCRIPTION:SPEAKER: Jeremy Munday\, UMD\, Asst. Prof. of Elec Engineering\ n\nTITLE: The Physics and Photonics of Next Generation Solar Cells \n\nABST RACT: Converting sunlight into electricity is an important process that spa ns many fields from physics and chemistry to electrical engineering and mat erials science. For a traditional solar cell\, the maximum power conversion efficiency is ~33%\; however\, the thermodynamic limit for converting sunl ight to power is ~95%. So what happens to this extra 62% and can it be reco vered? Surprisingly\, optics may hold the key to recovering much of this lo ss. Here\, I will present our recent work on a variety of architectures use d to confine and control light on the nanoscale for applications in solar e nergy. Structures can be designed to act as broadband antireflection coatin gs\, localized couplers to waveguide modes\, and optical concentrators. To surpass the efficiency limit of traditional photovoltaic devices\, I will d iscuss novel new methods using nanoscale optical concentration\, photonic c rystals to effectively modify the semiconductor bandgap\, and the generatio n and collection of hot electrons in plasmonic structures. HOST: Victor Yak ovenko LAST-MODIFIED:20160123T162847Z LOCATION:John S Toll Bldg. room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Prof. Jeremy Munday\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150408T180000Z DTEND:20150408T190000Z DTSTAMP:20260828T094430Z UID:olcl8if9ud9d0ed0elssjk8jf0@google.com CREATED:20150330T144756Z DESCRIPTION:Speaker Name: Ryan M. Jock\n\nSpeaker Institution: Department of Electrical Engineering\nPrinceton University\n\nTitle:Spin Dynamics of Electrons Confined in Silicon Heterostructures\n\nAbstract: Electron spin s tates in silicon heterostructures show promise as qubits for quantum inform ation processing. The small spin-orbit interaction and low concentration of silicon isotopes with a nuclear spin lead to long lived electron spin stat es in these materials. Recently\, a host of single and few electron silicon quantum device architectures have arisen as implementations for quantum co mputation. Conventional X-band (10 GHz) Electron Spin Resonance (ESR) is a natural method to probe the dynamics of electron spin states in silicon het erostructures to better understand the materials limitations on spin cohere nce. We have used these techniques to characterize and study interface diso rder and material quality in silicon heterostructures. Additionally\, we ha ve fabricated large area ensembles of gate defined Si/SiGe quantum dots (~ few x 10^8 dots with a lithographic diameter of 150 nm and a 500 nm period) and use ESR to study their relaxation and decoherence mechanisms. Long sin gle electron relaxation (1 ms) and coherence times (310 μs) have been obser ved at 350 mK\, showing promise for future silicon quantum device architect ures.\n LAST-MODIFIED:20150330T145726Z LOCATION:2136 Physical Sciences Complex SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special talk by Ryan Jock TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151029T163000Z DTEND:20151029T173000Z DTSTAMP:20260828T094430Z UID:hle1mlj4nc8e49vujq1o1funp0@google.com CREATED:20151001T185123Z DESCRIPTION:Speaker Name: Prof. Peter Taborek\n\nSpeaker Institution: Unive rsity of California - Irvine\, Department of Physics and Astronomy\n\nTitle : Pressure driven flow of normal and super fluids through single nanopipes \n\nAbstract: No slip boundary conditions successfully describe macroscopic flows near solids\, but this boundary condition is not a law of physics\, and several recent experiments have invoked large slip lengths to explain s urprising results on flow through carbon nanotubes and other nanoscale flow s. We will describe measurements of the mass flow rate as a function of pre ssure for flow through nanopipes made from single ion etch tracks 20 nm in diameter and glass tubes 200 nm in diameter. The extremely small flows invo lved are detected with a mass spectrometer. For classical fluids\, our meas urements always yield slip lengths less than 2 nm. For superfluid 4He \, th e flow rate has a complicated dependence on temperature and pressure which reflects the kinetics of vortex nucleation and vortex motion in the nanopip e. LAST-MODIFIED:20151028T194642Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160224T210000Z DTEND:20160224T220000Z DTSTAMP:20260828T094430Z UID:ikso273cnkmbgnvkvvkusc64ro@google.com CREATED:20160218T134929Z DESCRIPTION:Speaker Name: Prof. Mo Li\n\nSpeaker Institution : Department o f Electrical and Computer Engineering\, University of Minnesota \n\nTitle : Optomechanics\, 2D Materials and Spintronics Integrated with Silicon Photo nics\n\nAbstract : Development of silicon photonics has already been taken over from academia by the semiconductor industry aiming to build low-power inter-chip and intra-chip optical interconnect in large-scale with a total bandwidth reaching many Tbits/sec. On the other hand\, in research laborato ries\, integrated silicon photonic circuits provide high performance optica l platform enabling on-chip exploration of novel light-matter interactions. In this talk\, I will showcase four examples of my group’s research in usi ng silicon photonic chips as the underlying optical breadboard to study new optical physics and materials. First\, we demonstrate a cavity optomechani cal system that can mechanically shuttle photons between distant cavities a nd measure spin angular momentum of light. Second\, we show the integration of surface acoustic waves devices operating at unprecedentedly high freque ncy up to 20 GHz with nanophotonic cavities\, and strong acousto-optic modu lation enabled by co-confi! nement of light and sound waves. Third\, a rece ntly emerged two-dimensional material\, black phosphors (also called phosph orene)\, is integrated on silicon photonics to achieve efficient photodetec tion of infrared light\, enabled by black phosphorus’ direct and narrow ban dgap. Finally\, we introduce rare-earth transition-metal magnetic materials \, whose magnetization can be switched by ultrafast laser pulses\, to demon strate the first all-optically switchable magnetic tunneling junction (MTJ) that can be integrated with silicon photonics. This latest result of ours introduces a brand new category of non-volatile\, ultrafast opto-spintronic s devices to the inventory of photonic devices for information recording an d communication. LAST-MODIFIED:20160218T135047Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150226T203000Z DTEND:20150226T213000Z DTSTAMP:20260828T094430Z UID:77ojrm6b73pre8facgip3m73l4@google.com CREATED:20150220T204737Z DESCRIPTION:Speaker: Matt Calkins\nAbstract: We will begin talking about E. Witten\, "Notes On Supermanifolds and Integration"\, arxiv:1209.2199. LAST-MODIFIED:20150220T204737Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Witten's paper on integration on supermanifolds\, part 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150428T171500Z DTEND:20150428T183000Z DTSTAMP:20260828T094430Z UID:f3eeves56b16538gtk9po1sbuk@google.com CREATED:20150416T171918Z DESCRIPTION:Speaker Name: Professor Sheryl Ehrman\n\nSpeaker Institution : University of Maryland\, College Park\n\nTitle : Chaos is Cheap: Adventures in Gas Phase Materials Synthesis\n\nAbstract : Powders synthesized by aero sol routes are ubiquitous\, found in paint\, tires\, and even foods. In con trast to highly monodisperse nanosized particles that can be formed by coll oidal routes\, particles made by aerosol processes tend to be agglomerated and fractal-like in structure. While perhaps not as pleasing to the eye\, t hese materials are of great commercial value. In this presentation\, an ove rview of aerosol processing for materials synthesis will be given with an e mphasis on materials for energy and microelectronics applications.\n\n\n LAST-MODIFIED:20150416T172109Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160216T190000Z DTEND:20160216T200000Z DTSTAMP:20260828T094430Z UID:9ga7b6bcn026koj1ve3d56iif8@google.com CREATED:20160202T141228Z DESCRIPTION:Speaker Name: Anson Hook\n\nSpeaker Institution: Stanford \n\ nTitle: Non-Traditional Solutions to Naturalness\n\nAbstract: Explaining th e small value of the Higgs mass has motivated many different models such as supersymmetry and extra dimensions. Motivated by previous instances where naturalness has failed\, we present two new approaches towards explaining the small value of the Higgs mass. In the first solution\, the Higgs mass is a constantly changing quantity. The presence of a hot universe (reheati ng) is tied to a small Higgs mass explaining why the Higgs mass is at its c urrent small but changing value. The second solution\, NNaturalness\, post ulates that there are many copies of the Standard model with differing Higg s masses. Pure chance results in the presence of a small Higgs mass in one of the many copies. Reheating naturally occurs in such a way that only th e observed copy of the Standard model is reheated. These new non-tradition al solutions to the Higgs mass problem are relatively unconstrained and hav e new observational consequences.\n LAST-MODIFIED:20160216T185044Z LOCATION:2136 PSC SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140303T160000Z DTEND:20140303T173000Z DTSTAMP:20260828T094430Z UID:0692olf60vtn340rjfg3uv3unk@google.com CLASS:PUBLIC CREATED:20131216T192626Z DESCRIPTION:Speaker: Ryan Glasser\n\nTitle: "Quantum mutual information of an entangled state in the presence of\ndispersive media."\n\nAbstract: In this talk I will present recent experimental work investigating the beha vior of continuous-variable entanglement and quantum mutual information upo n propagation through dispersive media. A four-wave mixing process in warm atomic vapor is used to both generate an entangled state of light\, as wel l as produce a medium exhibiting slow- and fast-light properties. Differen ces in the behavior of the entanglement and quantum information after propa gating through such dispersive media will be \nhighlighted.\n\nSpeaker: Ste fan Natu\n \nTitle:Interaction induced Dynamical transitions in a spin-orbi t coupled thermal gas\n\nAbstract: The realization of synthetic gauge field s in ultra-cold Bose and Fermi gases enables the study of spin-orbit couple d systems in a novel setting. By dynamically tuning the interactions and sp in-orbit coupling\, experimentalists can explore the interplay between sing le-particle and many body degrees of freedom both in and out of equilibrium . Here we ask: What is the interplay between spin-orbit coupling and intera ctions in a gas driven out-of-equilibrium? We find that interactions and sp in-orbit coupling have competing effects on the spin dynamics. For a fully magnetized initial state\, spin-orbit coupling tends to destroy the net mag netization\, while interactions tend to stabilize the initial state. The in terplay between these two effects therefore lead to three distinct dynamica l regimes at long times: an unmagnetized state for weak interactions\, a pa rtially magnetized state for strong interactions\, and a state with undampe d magnetization oscillations about a zero mean value for intermediate inter actions. We establish a connection between spin dynamics in the spin-orbit coupled gas and self trapping in a double well Bose Einstein condensate. LAST-MODIFIED:20140228T155320Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Postdoctoral Research Seminars TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150128T190000Z DTEND:20150128T203000Z DTSTAMP:20260828T094430Z UID:gcnb91roj2997ngdcjctrudqf4@google.com CREATED:20150123T203742Z DESCRIPTION:Speaker Name: Markus Klute\n\nSpeaker Institution: Massachusett s Institute of Technology\n\nTitle: "Exploiting the LHC Physics Potential" LAST-MODIFIED:20150123T205428Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160330T173000Z DTEND:20160330T190000Z DTSTAMP:20260828T094430Z UID:73dadsfd1175viul24u8e9529s@google.com CREATED:20160303T190300Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART II (March 30\, 31\, April 1) will review a closel y related topic\, the mysterious entropy associated with black holes and ot her causal horizons (e.g. in cosmology). This part will explain why horizon s obey the laws of thermodynamics\, and how corrections coming from quantum mechanics and string theory are manifested. I will also discuss nonpertur bative speculations concerning microstates\, the information puzzle\, and f irewalls. LAST-MODIFIED:20160303T190433Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150831T190000Z DTEND:20150831T203000Z DTSTAMP:20260828T094430Z UID:bh6120phmim9k4dljaolehidv0@google.com CREATED:20150831T131911Z DESCRIPTION:Speaker: Celso Nishi\n\nSpeaker Institution: UFABC\n\nTitle: Fl avored CP symmetries for neutrinos\n\nAbstract: Abstract: We discuss gauge models incorporating $\\mu-\\tau$ flavored CP symmetry (called $\\cpmutau$ in the text) in combination with $L_\\mu-L_\\tau$ invariance to understand neutrino mixings and discuss their phenomenological implications. We show t hat viable leptogenesis in this setting requires that the lightest right-ha nded neutrino mass must be between $10^9-10^{12}$ GeV and for effective two hierarchical right-handed neutrinos\, leptogenesis takes place only in a n arrower range of $5\\times 10^{10}-10^{12}$ GeV. A multi-Higgs realization of this idea implies that there must be a pseudoscalar Higgs boson with ma ss less than 300 GeV. Generically\, the vev alignment problem can be natura lly avoided in our setting.\n\nJoin with Google Hangouts: https://hangouts. google.com/hangouts/_/physics.umd.edu/hmarkle?hceid=bGJrNjYwYTc1YjhqaDdlazZ qcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.bh6120phmim9k4dljaolehidv0& hs=121 LAST-MODIFIED:20150831T132105Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150114T190000Z DTEND:20150114T200000Z DTSTAMP:20260828T094430Z UID:t8jo3noi2bm3ivm25knc5g30g0@google.com CREATED:20150107T135108Z DESCRIPTION:Speaker Name: Evelyn May Yin Tang\n\nSpeaker Institution: MIT\ n\nTitle: Strain-induced partially flat band\, helical snake states and int erface superconductivity in topological crystalline insulators\n\nAbstract: Topological crystalline insulators in IV-VI compounds host novel topologic al surface states consisting of multi-valley massless Dirac fermions at low energy. Here we show that strain generically acts as an effective gauge fi eld on these Dirac fermions and creates pseudo-Landau orbitals without brea king time-reversal symmetry. We predict the realization of this phenomenon in IV-VI semiconductor heterostructures\, due to a naturally\noccurring mis fit dislocation array at the interface that produces a periodically varying strain field. Remarkably\, the zero-energy Landau orbitals form a flat ban d in the vicinity of the Dirac point\, and coexist with a network of snake states at higher energy.\nWe propose that the high density of states of thi s flat band gives rise to interface superconductivity observed in IV-VI sem iconductor multilayers at unusually high temperatures\, with non-BCS behavi or.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ph ysics.umd.edu/evelyn-may-yin?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jv dXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.t8jo3noi2bm3ivm25knc5g30g0&hs=121 LAST-MODIFIED:20150112T195652Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Other Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140430T173000Z DTEND:20140430T190000Z DTSTAMP:20260828T094430Z UID:jtmbhkg26gisnn0ftjgk5bdfhc@google.com CREATED:20140304T204250Z DESCRIPTION:Speaker: Luc Blanchet\, IAP\n\nTitle: Recent developments on po st-Newtonian computations of compact binary inspiral\n\nAbstract: The forth coming detection and analysis of gravitational waves\ngenerated by compact binary systems (neutron stars and black holes) relies\non the availability of gravitational wave templates ---\ni.e. the basic predictions from genera l relativity (weighted by the power\ndensity of noise in a given detector). In this talk we shall recall how a\ncombination of analytical post-Newtoni an approximations and numerical\nmethods permits to build accurate and reli able templates for compact\nbinary coalescence\, that are used in the data analysis of the current\nnetwork of detectors. We shall then discuss two mo re recent topics. First\,\nthe comparison of post-Newtonian predictions wit h those based on black\nhole perturbation theory and notably the self-force approach. Related to\nthat is the recent use of the so-called first law of point particle\ndynamics that we shall explain. Second\, the\ninclusion of high order spin-orbit effects both in the dynamics\n(i.e. the equations of motion) and the gravitational wave field\, which\ndictates the orbital pha se evolution\, of black hole binaries\,\nincluding the effects of spin and orbital precession. LAST-MODIFIED:20140423T175601Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140210T160000Z DTEND:20140210T173000Z DTSTAMP:20260828T094430Z UID:06mhr20nhgglpne0uqvpomngh0@google.com CLASS:PUBLIC CREATED:20131216T191105Z DESCRIPTION:Speaker: Anatoli Polkovnikov\, Boston University\n\nTitle: Quan tum geometry and non-adiabatic response\n\nAbstract: In this talk I will r eview the basic notions of quantum geometry encoded in the Berry curvature and the Fubini-Study metric tensor as well as the topological invariants as sociated with them: the Chern number and the Euler characteristic. I will d iscuss how the Berry curvature emerges as a Lorentz type force in an arbitr ary parameter space\, where parameters like e.g. components of the magnetic field play the role of coordinates\, and constitutes a dynamical Hall type response. This allows one to measure it and hence the Chern number directl y in a wide class of systems interacting or not. I will show recent experim ents\, which observe topological phase diagram in superconducting qubits ba sed on these ideas\, which can be mapped to the Haldane model (single qubit ) and a more complicated four band model (two coupled qubits). Finally I wi ll discuss that the metric tensor is closely related to the basic concept o f the mass tensor for any type of motion and hence can be also directly mea sured.\n LAST-MODIFIED:20140203T160214Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150422T193000Z DTEND:20150422T203000Z DTSTAMP:20260828T094430Z UID:dg15hhe3fg3erc5fcsb7sor4qo@google.com CREATED:20150416T192205Z DESCRIPTION:Speaker Name: Dr. Glenn Solomon\n\nSpeaker Institution : Joint Quantum Institute\n\nTitle : Characterizing the light emitted from single s emiconductor quantum dots\n\nAbstract : Semiconductor quantum dots (QDs) of InAs in GaAs are bright emitters of discrete photons. They can be used in a variety of fundamental quantum optics experiments and will likely contrib ute to applications in quantum information. The benefits of semiconductor Q Ds in quantum information are integration and scaling. Yet\, the very prope rties that allow these benefits also create intrinsic problems.\n\nAfter a general introduction to the fabrication and optical properties of QDs\, I w ill discuss second order correlation measurements of QD light. The second-o rder auto-correlation is important in distinguishing between classical and quantum light sources. It is particularly important here for the characteri zation of the single-photon purity. The second-order cross-correlation offe rs insight into the indistinguishability properties of the light. As techno logy improves and material system change\, these measurements naturally evo lve. I will discuss one or two evolutions in these techniques\, and make so me connections to applications using QD light.\n\nNotes: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the p hone on the left hand side of the front door to call the receptionist for e ntry.\n\n LAST-MODIFIED:20150416T203801Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Drive\, College Park\, MD 20740\, United States SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151007T200000Z DTEND:20151007T210000Z DTSTAMP:20260828T094430Z UID:s0ak7qge9aq423scj0pqko9u34@google.com CREATED:20150930T200307Z DESCRIPTION:Title : Magnetic Reconnection in a Weakly Ionized Plasma\nSpeak er Name: Prof. Vyacheslav (Slava) Lukin\nSpeaker Institution : NSF/U. Washi ngton\nAbstract : Magnetic reconnection\, the prototypical example of a non linear magnetized plasma phenomenon that can couple physical processes acro ss decades of spatial and temporal scales\, is known or conjectured to take place in a variety of laboratory settings\, throughout the heliosphere\, a s well as in any number of astrophysical systems. There is active ongoing e xperimental\, computational\, and theoretical research into the basic physi cs of magnetic reconnection in a variety of plasma parameter regimes\, from classical fully ionized plasmas\, to relativistic radiation-dominated plas mas\, to strongly-coupled high energy density plasmas. In this talk\, I wil l present results of the first self-consistent multi-fluid simulations of m agnetic reconnection in a reacting partially ionized plasma\, where the ion ized and neutral fluids are treated as coupled but distinct. Different plas ma processes\, such as ionization and recombination\, ion-neutral interacti on via charge-exchange collisions\, Hall currents\, and radiative losses ca n become the dominant factors in determining the reconnection rate and the structure of the reconnection region in different parameter regimes. The Hi Fi multi-fluid modeling framework has been used to implement the above proc esses in a single self-consistent model and to perform 2D simulations of ma gnetic reconnection under a variety of plasma conditions. Simulation result s addressing the rate of magnetic reconnection\, the structure of a reconne ction region in a weakly ionized plasma\, and the possible implications for magnetic reconnection in the partially ionized solar chromosphere will be presented. LAST-MODIFIED:20150930T200307Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160229T210000Z DTEND:20160229T220000Z DTSTAMP:20260828T094430Z UID:7sqom6krlrg5t0kr1lbatuhtj0@google.com CREATED:20160222T191757Z DESCRIPTION:Speaker Name: Dr. Kara Hoffman\n\nSpeaker Institution : Univers ity of Maryland\n\nTitle : JSI Colloquium Series\n\nAbstract : In the summe r of 2012\, the IceCube Neutrino Observatory announced the observation of t wo neutrino interactions deep in the south polar icecap\, each with energie s in excess of 10^15 eV\, making them the highest energy neutrinos ever obs erved. Further analysis and additional data revealed that these events form ed the tail of a spectrum that is inconsistent with the background from neu trinos produced by cosmic ray interactions with the atmosphere. While the m easured rates agree with theoretical predictions of an astrophysical neutri no flux\, many questions remain. Where did they come from? Does the spectru m abruptly cut off just above a PeV\, or is it steeply falling? I will pres ent the latest results from IceCube\, and discuss future plans.\n\nNotes: S nacks and beverages available at 3:30 pm.\n\nhttps://jsi.astro.umd.edu/jsi- colloquium-series\n LAST-MODIFIED:20160222T191757Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150409T193000Z DTEND:20150409T203000Z DTSTAMP:20260828T094430Z UID:95j98nof2v1ae4n0sc1n3ssjjk@google.com CREATED:20150403T150908Z DESCRIPTION:Speaker: Jim Gates and William Linch\nAbstract: We will begin t alking about S. J. Gates\, "Ectoplasm Has No Topology: The Prelude"\, arXi v:hep-th/9709104\, and its connection with the Witten paper on integration. LAST-MODIFIED:20150403T150908Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to "ectoplasm" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140430T200000Z DTEND:20140430T210000Z DTSTAMP:20260828T094430Z UID:abh3m1250un8p6qi6ggeg6hg5c@google.com CREATED:20140410T133123Z DESCRIPTION:College of Computer\, Mathematical\, and Natural Sciences\nBoar d of Visitors Seminar\nPhysics of Medical Devices \nby Dr. Robert E. Fische ll\n\n*Limited Space available LAST-MODIFIED:20140410T133819Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Board of Visitors Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150309T200000Z DTEND:20150309T210000Z DTSTAMP:20260828T094430Z UID:rgmdv741809bj6mbo2frfiejp4@google.com CREATED:20150304T210421Z LAST-MODIFIED:20150304T210429Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Biophysics Seminar today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140304T220000Z DTEND:20140304T230000Z DTSTAMP:20260828T094430Z UID:lb8p00ip5l0d1dcku5b2t4m0b4@google.com CREATED:20140211T192612Z DESCRIPTION:Improved Mixed Integer Linear Optimization Formulations for Uni t Commitment\nhttp://www.civil.umd.edu/sites/default/files/documents/cee-se minar-anjos.pdf\nSpeaker: Dr. Miguel F. Anjos\nFull Professor and Canada Re search Chair\nDepartment of Mathematics & Industrial Engineering\nPolytechn ique Montréal\n\nAbstract:\nWe present two ways to improve the mixed-intege r linear optimization formulation for the unit commitment problem. The firs t is a new class of inequalities that give a tighter description of the fea sible generator schedules. The second is a modified orbital branching techn ique that exploits the symmetry created by identical generators. Computatio nal results show that these approaches can significantly reduce overall sol ution times for realistic instances of unit commitment.\n\nBio:\nMiguel F. Anjos is Full Professor and Canada Research Chair in the Department of Math ematics & Industrial Engineering of Polytechnique Montreal\, where he curre ntly serves as Interim Director of the new Trottier Energy Institute. He re ceived his degrees from McGill University\, Stanford University\, and the U niversity of Waterloo. His research interests are in the theory\, algorithm s and applications of mathematical optimization. He is particularly interes ted in the application of optimization to problems in power systems managem ent and smart grid design. He is Editor-in-Chief of Optimization and Engine ering and serves on the editorial boards of Discrete Applied Mathematics\, RAIRO-OR\, and Surveys in Operations Research and Management Science. He cu rrently serves on the Council of the Mathematical Optimization Society. He is also a member of the Research Review Committee of Mitacs. He received th e Meritas Teaching Award from Ecole Polytechnique in 2012. He was awarded a Humboldt Research Fellowship for Experienced Researchers in 2009\, and the Queen Elizabeth II Diamond Jubilee Medal in 2013 for significant contribut ions to mathematical optimization and its industrial applications.\n\n**Lig ht snacks and refreshments will precede the lecture from 4:30 – 5:00 pm\nCo ntact: Andy Blohm\, andymd26@umd.edu\n\n\n LAST-MODIFIED:20140211T192612Z LOCATION:Engineering Laboratory Building (EGL) #1202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Civil Systems Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151030T150000Z DTEND:20151030T163000Z DTSTAMP:20260828T094430Z UID:sg67kgbailvlq06qho8pg8j0a0@google.com CREATED:20151001T230837Z DESCRIPTION:Speaker: Victor Vakaryuk (Associate Editor\, PRB)\n\nTitle: Phy sical Review B: An inside look\n\nAbstract: PRB is the largest journal in a ll of physics and the second largest in all of science. It receives around 10\,000 submissions annually which are handled by a team of 10 in-house edi tors. Being one of them I will give an overview of the journal and its edit orial policies and practices in a way it could be useful for the audience o f both authors and referees. I will also spend some time talking about othe r members of Physical Review family such as PRL and recently launched open- access journal PRX.\n\nHost: Victor Galitski\n\nhttp://www.physics.umd.edu/ cmtc/seminars.html LAST-MODIFIED:20151001T230837Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150914T200000Z DTEND:20150914T213000Z DTSTAMP:20260828T094430Z UID:h6cvnq6245klc285r0gauqdfks@google.com CREATED:20150909T144555Z DESCRIPTION:Title : TBA\nSpeaker Name: Jun Allard\nSpeaker Institution : UC -Irvine LAST-MODIFIED:20150909T144555Z LOCATION:Room 0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141202T181500Z DTEND:20141202T193000Z DTSTAMP:20260828T094430Z UID:jco5fifplaiucumt9qsu1l52k8@google.com CREATED:20141119T152513Z DESCRIPTION:Speaker Name: Professor Marina Guenza\n\nSpeaker Institution : University of Oregon\n\nTitle: Thermodynamic Consistency and Other Challen ges in Coarse-Graining Models.\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jco5fifplaiucumt9qsu1l52k8 &hs=121 LAST-MODIFIED:20141119T153652Z LOCATION:Room 1116\, IPST Building\, Bldg. 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150203T173000Z DTEND:20150203T183000Z DTSTAMP:20260828T094430Z UID:7jv2ps17t7a3cvb3vsl3pl7k6g@google.com CREATED:20150129T190041Z DESCRIPTION:Dr. Joe Redish will be speaking to the Department of Human Deve lopment & Quantitative Methodology at its Educational Psychology Colloquium . \n\nThe talk will be held Tuesday\, February 3\, from 12:30 to 1:30 PM\ , in Benjamin Building room 3233. Lunch will be provided starting at 12:15 PM. Dr. Redish will be giving a talk entitled:\n\n "Epistemological framing : The role of selective attention in building rich knowledge structures."\n \nThanks and we hope to see anyone who is interested next week!\nEmily Rose nzweig LAST-MODIFIED:20150129T190041Z LOCATION:3233 Benjamin Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Educational Psychology Colloquium: Joe Redish TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150209T210000Z DTEND:20150209T223000Z DTSTAMP:20260828T094430Z UID:77fqc4kub3d2ol8nc2b5a8u604@google.com CREATED:20150130T140509Z DESCRIPTION:Speaker Name: David Yaylali\n\nSpeaker Institution: University of Arizona\n\nTitle: Where Dark Alleys Meet: New Pathways for Probing the I nvisible\n\nAbstract: Over the past two decades\, many different kinds of e xperiments have been designed in order to search for dark matter (DM) and e lucidate its properties. These include collider experiments which attempt to produce DM\, telescope experiments which search for annihilating DM in t he cosmos\, and underground experiments which attempt to detect DM passing through the earth. Although these experiments are very different in their overall approaches\, their results nevertheless have direct implications fo r each other.\n\nIn this talk\, I will discuss how an additional prong in t his experimental program --- searches for dark-matter *decay* --- connects into this web. Potential signals from these decays can have direct implica tions for the success or failure of the other experimental efforts\, and th us enrich the idea of ``complementarity'' in the hunt for dark matter.\n\nJ oin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.um d.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5 kYXIuZ29vZ2xlLmNvbQ.77fqc4kub3d2ol8nc2b5a8u604&hs=121 LAST-MODIFIED:20150205T210047Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151016T160000Z DTEND:20151016T170000Z DTSTAMP:20260828T094430Z UID:i5okqirbh012v5fbuu5ahumko4@google.com CLASS:PUBLIC CREATED:20151008T130508Z DESCRIPTION:Davy Foote\; JQI\n\n(Free lunch served at 11:45)\n\nTitle: The role of optical and electron-wavepacket interferences in optimal control ex periments\n\nAbstract: Ultrafast and ultraintense laser pulses are a common tool for optimally controlling chemical and molecular dynamics\, due prima rily to the simplicity of temporally shaping these pulses. Unfortunately\, the optimal control pulses found in these experiments do not "explain thems elves"--that is\, it is generally unknown how these pulses optimally guide a system to its target state. We have found that a twin-peaked pulse (TPP)\ , with a well-defined relative phase between the two peaks\, can optimally control Coulomb explosion branching ratios in CO2. In an effort to "unpack" this pulse\, I will focus in this talk on one aspect of this control--the effect of TPP relative phase on ionization yields. We have found in our exp eriments a 2π-periodic variation in Xe+ yield as a function of TPP relative phase. Two different mechanisms that can lead to such a modulation have be en considered: optical interference of the two peaks and wavepacket interfe rence of the ionized electrons. Our experimental results will be compared t o models describing both effects to discover which process is dominant in o ptimal control experiments. LAST-MODIFIED:20151008T130509Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140918T173000Z DTEND:20140918T180000Z DTSTAMP:20260828T094430Z UID:q829feiv8p6teq7do340eg25rc@google.com CREATED:20140828T211746Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.q829feiv8p6teq7do340eg25rc&hs=121 LAST-MODIFIED:20140828T211805Z LOCATION:Room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for the CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150507T193000Z DTEND:20150507T203000Z DTSTAMP:20260828T094430Z UID:l661dhda92jvr5tegn94uipod8@google.com CREATED:20150424T130357Z DESCRIPTION:Speaker: Daniel Marino-Johnson\n LAST-MODIFIED:20150424T130357Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:More on relative Lie algebra cohomology and superforms TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151210T160000Z DTEND:20151210T170000Z DTSTAMP:20260828T094430Z UID:rduo04ggaf0n62hr2c7il6g3d0@google.com CREATED:20151208T144012Z DESCRIPTION:Speaker: Christine Muschik\n\nSpeaker Institution: Innsbruck\n\ nTitle: Quantum Simulation of a Wilson lattice gauge theory\n\nAbstract: Ga uge theories are the backbone of our current understanding of\nfundamental interactions. While some of their aspects can be\nunderstood using establis hed perturbative techniques\, the need for a\nnon-perturbative framework le d to the lattice formulation of gauge\ntheories by Wilson in 1974. Since th en\, numerical simulations of\nlattice gauge theories have celebrated succe ss in a plethora of\nequilibrium phenomena\, such as the ab initio calculat ion of the\nlow-energy hadron spectrum. However\, classical simulations of gauge\ntheories face a major challenge when addressing real-time dynamics\, \nwhich has hampered the full understanding of many physical phenomena\ninc luding the complex thermalization during heavy-ion collisions and\nthe dyna mics of string breaking studied at high-intensity laser\nfacilities. Here\, we report on the experimental realization of a U(1)\nlattice gauge theory on a trapped ion quantum computer. By encoding\nthe gauge fields in asymmet ric long-range interactions between the\nfermions\, we are able to realize a minimal instance of Wilson’s\nversion of quantum electrodynamics in (1+1) -dimensions\, i.e.\, the\nSchwinger model. We investigate its real-time dyn amics following a\nquantum quench from the vacuum state for a broad range o f masses and\nelectric-field couplings. Further\, we experimentally quantif y the\nentanglement generated during the dynamics\, using the logarithmic\n negativity\, and show that it displays qualitatively different features\nin different parameter regimes\, which are already appreciable for the\nmodes t system sizes under investigation.\n\nJoint work with M. Heyl\, P. Hauke\, M. Dalmonte\, P. Zoller\, E.\nMartinez\, D. Nigg\, A. Erhard\, P. Schindle r\, T. Monz\, R. Blatt LAST-MODIFIED:20151210T162046Z LOCATION:2115 Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140218T181500Z DTEND:20140218T193000Z DTSTAMP:20260828T094430Z UID:sm9vftgegdi9knnkptjs434u58@google.com CREATED:20140210T151815Z DESCRIPTION:Speaker Name: Professor Anil Deane\n\nSpeaker Institution : Uni versity of Maryland\, College Park\n\nTitle : Analytics in Finance\n\nNotes : As in the past\, each seminar will be preceded by an Informal Cafeteria Lunch to which all are welcome\, departing from Room 1108 about five minute s after 12:00 (Noon).\nFor Further information contact:\nProfessor Christop her Jarzynski\, cjarzyns@umd.edu\, (301)405-4439 Professor John Weeks\, jdw @umd.edu (301)405-4802 Professor Michelle Girvan\, Girvan@umd.edu (301)405- 1610\n LAST-MODIFIED:20140210T151815Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140507T193000Z DTEND:20140507T210000Z DTSTAMP:20260828T094430Z UID:fn6digc28u00n3vt6dst67pj88@google.com CREATED:20140430T152936Z DESCRIPTION:**NOTICE: Please note new location**\n\nSpeaker Name: Kostas Or ginos\n\nSpeaker Institution: College of William & Mary\n\nTitle: Non-pertu rbative renormalization of twist-2 matrix elements\n\nAbstract: The moments of structure functions of the proton can be calculated non-perturbatively in lattice QCD. However\, the lattice regulator breaks rotational symmetry resulting in power divergent mixing to spoils the continuum limit of the re levant matrix elements when evaluating them on the lattice.\nSuch power div ergent mixings require non-perturbative subtraction. In addition a complet e non-perturbative computation of these matrix elements requires non-pertur bative renormalization. \nIn this talk\, I present a new approach for dete rmining non-perturbatively the power divergent mixings well the renormaliza tion constants of twist-2\nmatrix elements. Such approach has the potential of allowing for more precise computations of larger number of moments than currently possible. LAST-MODIFIED:20140501T194221Z LOCATION:PSC 3132 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160205T160000Z DTEND:20160205T170000Z DTSTAMP:20260828T094430Z UID:rb0af389l5877kj7g40mkhpddg@google.com CREATED:20160203T194755Z DESCRIPTION:Speaker Name: Robert Schoelkopf\n\nSpeaker Institution : Yale U niversity\n\nTitle: Extending the lifetime of quantum information through e rror correction\n \nAbstract : Extending the lifetime of quantum informat ion through error correction\nIn the past 13 years\, many new particles hav e been discovered that are clearly hadrons (interacting via the strong nucl ear force)\, but do not seem to fit into either of the known hadron categor ies of meson (quark-antiquark) or baryon (3 quarks). Several species of th ese ``exotic’’ particles\, called X\, Y\, and Z\, are now believed to be te traquarks\, and last July the LHC announced the discovery of pentaquark sta tes\, P_c. We begin by reviewing the basics of QCD (quarks\, color\, confi nement\, etc.)\, and then turn to the question of how conventional mesons a re identified\, which allows one to identify exotics. After reviewing thei r experimental discovery\, we consider the question of how exotics are asse mbled. Several competing physical pictures attempt to describe the struct ure of exotics: as molecules of known hadrons\, as the result of kinematica l effects\, and others. I propose that they arise due to the formation of compact diquarks\, a well-known but under-appreciated phenomenon of QCD. T he competing facts of kinematics and diquark confinement create an entirely new kind of bound state: not a molecule with well-defined orbits\, but an extended object that lasts only as long as it takes for quantum mechanics t o allow the separated quarks and antiquarks to “find” one another\, and all ow decays to occur. I will discuss several observed effects that support t his picture.\n LAST-MODIFIED:20160203T194959Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140421T203000Z DTEND:20140421T213000Z DTSTAMP:20260828T094430Z UID:jkjm0fgdp7br7n7tth0adogja0@google.com CREATED:20140305T155501Z DESCRIPTION:Speaker Name: Nat Gopalswamy\n\nSpeaker Institution : Solar Phy sics Laboratory\, NASA Goddard Space Flight Center\, Greenbelt\, MD 20771\n \nTitle: Space Weather Consequences of the Weak Solar Activity Cycle 24\n\ nAbstract: The two main space weather consequences of solar activity are l arge solar energetic particle (SEP) events and major geomagnetic storms. Th e weak solar activity during solar cycle 24 seems to affect the SEP product ion in a peculiar way: the number of large SEP events is similar to that in cycle 23\, but the particles are not accelerated to high energies\, as evi denced by the dearth of ground level enhancement (GLE) events. The frequenc y and intensity of large geomagnetic storms are also at a historical low du ring solar cycle 24. Even though the Sun is in its maximum phase\, there ha ve been only a dozen major storms (Dst ≤ -100 nT) in cycle 24 so far\, comp ared to 40 storms during the first 5 years of cycle 23. The storm intensity never exceeded 140 nT\, whereas there were 9 storms in cycle 23 with Dst ≤ -200 nT (one of the storms had Dst ~ -301 nT). Both large SEP events and m ajor geomagnetic storms are caused by energetic CMEs. When we examined the properties of the associated CMEs\, we found that the average speed of SEP- producing CMEs is larger than that in cycle 23. Furthermore\, all SEP-produ cing CMEs of cycle 24 are halos\, compared to about 70% in cycle 23. The av erage speed of storm-producing CMEs was about 40% higher than that in the f irst half of cycle 23. The fraction of halo CMEs is also about 20% higher. In other words\, cycle-24 CMEs seem to require more energy to produce simil ar or weaker space weather events. These observations indicate that there i s something fundamentally different about cycle-24: CMEs seem to expand ano malously owing to the reduced heliospheric pressure. We suggest that such e xpansion dilutes the magnetic content of CMEs\, thus resulting in weaker in teraction with the magnetosphere. Another consequence of the weak cycle is the reduced magnetic field in the heliosphere\, which might have reduced th e efficiency of particle acceleration.\n\nNotes: Coffee\, Tea & Cookies 4:1 5-4:30 PM\n LAST-MODIFIED:20140305T155954Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151019T200000Z DTEND:20151019T210000Z DTSTAMP:20260828T094430Z UID:l2lot3kjq3g377agrlmgfoj15k@google.com CREATED:20150925T130857Z DESCRIPTION:Title : Paint Branch Lecture Series: Remote Detection via Quant um Coherence\nSpeaker Name: Prof. Marlan O Scully\nSpeaker Institution : Ba ylor\, Princeton\, and Texas A&M Universities\nAbstract : There is nothing so practical as a good theory. As a case in point\, the compelling need for standoff detection of hazardous gases and vapor indicators of explosives h as motivated the development of remotely pumped schemes that produce radiat ion in the backward direction. Moving from conceptualization to theoretical analysis and experimental verification\, we demonstrate that high gain can be achieved in air. Backward air lasing provides possibilities for remote detection\, as will be discussed.\n LAST-MODIFIED:20150925T130857Z LOCATION:Room 1101 Biosciences Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151130T200000Z DTEND:20151130T213000Z DTSTAMP:20260828T094430Z UID:ef1f7tajo5k55bfio9o2cuu76s@google.com CREATED:20151117T145346Z DESCRIPTION:Speaker: Josh Berger\n\nSpeaker Institution: SLAC\n\nTitle: Cos mological Probes of Nearly Decoupled Dark Sectors\n\nAbstract: Little is kn own about any other forces that may couple to dark matter. If dark matter couples to a new U(1) gauge boson or Higgs boson\, this dark mediator could have very small coupling with the standard model. In this talk\, I presen t constraints on such a nearly decoupled dark mediator. If the particle is sufficiently long lived\, it can disrupt standard big bang nucleosynthesis or distort the spectrum of cosmic microwave background radiation. These e ffects offer an effective probe of mixing angles in the range 10^-17 to 10^ -10 for dark photons and 10^-15 to 10^-6 for dark Higgs for masses above 1 MeV. Dramatic improvements can be obtained in future experiments such as P IXIE.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jvd XAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ef1f7tajo5k55bfio9o2cuu76s&hs=121 LAST-MODIFIED:20151117T145346Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150422T150000Z DTEND:20150422T160000Z DTSTAMP:20260828T094430Z UID:hqm02hd16pem58hqjb46km2148@google.com CLASS:PUBLIC CREATED:20150420T144029Z DESCRIPTION:Speaker:\nJames Schneelock\, Rochester\n\n\nTitle:\nPosition-Mo mentum EPR Steering: Making Continuous-Variable Quantum\nEntanglement Easie r to see with Discrete Measurements\n\nAbstract:\nHere\, I am going to disc uss the relatively new concept known as\nEPR-steering\, a variety of supra- classical behavior intermediate between\nsimple entanglement and Bell nonlo cality. Though much of EPR-steering\ncould be interpreted as the remote man ipulation of a quantum state due to\noperations on an entangled partner\, E PR steering is a bit more stringent\nin that these remote manipulations are not to be explained locally\n(constituting a demonstration of the EPR para dox). In particular\, I will\ndescribe the foundations\, historical progres s\, and applications of\nEPR-steering\, as well as my own research into mak ing these correlations\neasier to demonstrate for position and momentum.\n LAST-MODIFIED:20150420T144029Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160311T170000Z DTEND:20160311T180000Z DTSTAMP:20260828T094430Z UID:43rp1f64gbov8bm046cgu33sfo@google.com CREATED:20160304T150235Z DESCRIPTION: (Free lunch served at 12:00)\n\nDr. Mehdi Kargarian\, CMTC\n\n Amperian pairing at the surface of topological insulators\n\nThe surface of a 3D topological insulator is described by a helical electron state with e lectron’s spin and momentum locked together. I will discuss that in the pre sence of ferromagnetic fluctuations the surface of a topological insulator is unstable towards a superconducting state with unusual pairing dubbed as Amperian pairings. The key idea is that the dynamical fluctuations of a fer romagnetic layer deposited on the surface of a topological insulators coupl e to the electrons as gauge fields. The transverse components of the magnet ic gauge fields are unscreened and can mediate an effective interaction bet ween electrons. What makes the mechanism of pairing to be of Amperian type is an attractive for electrons with momenta in the same directions. We show that this attractive interaction leads to p-wave pairing instability of th e Fermi surface in Cooper channel. LAST-MODIFIED:20160304T150235Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150521T180000Z DTEND:20150521T193000Z DTSTAMP:20260828T094430Z UID:s6ctvfuknn6vgvp4sk3d9i2gdk@google.com CREATED:20150515T165630Z DESCRIPTION:Speaker: Sungwoo Hong\n\nSpeaker Institution: University of Mar yland \n\nTitle: A Hidden Dark Matter Sector\, Dark Radiation\, and the CMB \n\nAbstract: I consider theories where dark matter is composed of a therma l relic of weak scale mass\, whose couplings to the Standard Model (SM) are however too small to give rise to the observed abundance. Instead\, the ab undance is set by annihilation to light hidden sector states that carry no charges under the SM gauge interactions. In such a scenario the constraints from direct and indirect detection\, and from collider searches for dark m atter\, can easily be satisfied. The masses of such light hidden states can be protected by symmetry if they are Nambu-Goldstone bosons\, fermions\, o r gauge bosons. These states can then contribute to the cosmic energy densi ty as dark radiation\, leading to observable signals in the cosmic microwav e background (CMB). Furthermore\, depending on whether or not the light hid den sector states self-interact\, the fraction of the total energy density that free-streams is either decreased or increased\, leading to characteris tic effects on both the scalar and tensor components of the CMB anisotropy that allows these two cases to be distinguished. The magnitude of these sig nals depends on the number of light degrees of freedom in the hidden sector \, and on the temperature at which it kinetically decouples from the SM. We consider a simple model that realizes this scenario\, based on a framework in which the SM and hidden sector are initially in thermal equilibrium thr ough the Higgs portal\, and show that the resulting signals are compatible with recent Planck results\, while large enough to be detected in upcoming experiments such as CMBPol and CMB Stage-IV.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bG JrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.s6ctvf uknn6vgvp4sk3d9i2gdk&hs=121 LAST-MODIFIED:20150515T165644Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160307T213000Z DTEND:20160307T223000Z DTSTAMP:20260828T094430Z UID:him55u4q6u3rpnrhd49mnm9p2o@google.com CREATED:20160201T162623Z DESCRIPTION:Speaker Name: Abaz Kryemadhi\n\nSpeaker Institution : Messiah C ollege\n\nTitle : Study of Silicon Photomultipliers coupled to LYSO crystal s as a compact photon detector\n\nAbstract : The Silicon Photomultipliers ( SiPMs) are novel photon-detectors which have been progressively found their use in particle physics. Their small size\, good single photon resolution\ , simple readout\, and immunity to magnetic fields offers advantages compar ed to traditional photomultipliers. A LYSO crystal is a relatively new scin tillator which has a high light yield and fast decay time. The combination of SiPMs with LYSO crystals makes for compact detector design which could b e used in balloon and space particle physics applications. Results from a p erformance study of this detector will be presented. LAST-MODIFIED:20160204T201858Z LOCATION:CSS Building Rm 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150506T170000Z DTEND:20150506T183000Z DTSTAMP:20260828T094430Z UID:9s95edfka8ldvniau431sleg58@google.com CREATED:20150414T151851Z DESCRIPTION:Speaker Name: Carlos Schat\n\nSpeaker Institution: CONICET\, Un iversity of Buenos Aires\n\nTitle: NN and NNN in 1/N\n\nAbstract: I will pr esent some new recent insights into the structure of\nthe parity violating nuclear force\, and also on the (parity\nconserving) three-nucleon force\, that can be obtained from the\n1/Nc expansion of QCD. LAST-MODIFIED:20150501T190051Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160222T210000Z DTEND:20160222T220000Z DTSTAMP:20260828T094430Z UID:ufs835scn33nr2ub23jotkjg88@google.com CREATED:20160217T143753Z DESCRIPTION:Speaker Name: Anja Geitmann\n\nSpeaker Institution : McGill Uni versity \n\nTitle: The mechanics of invasive growth\n\nAbstract : Invasive behavior is the hallmark of a variety of cell types of animal\, plant and f ungal origin. To move against or invade a matrix requires the ability to me chanically invade this substrate. In cells devoid of a rigid cell wall a cy toskeleton mediated mechanism generates pushing and traction forces whereas walled cells employ forces exerted by the cellular turgor pressure. One of the most rapid and highly targeted invasive activities is performed by the pollen tube\, the delivery tool of the sperm cells in the flowering plants . The pollen tube must not only exert invasive forces but also perceive the geometry and mechanical consistency of the growth substrate and follow dir ectional cues emitted by the pistil and the female gametophyte. We investig ate the directional growth behavior and the ability to cope with mechanical obstacles using the TipChip\, a microfluidic experimental platform. LAST-MODIFIED:20160217T143900Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150211T203000Z DTEND:20150211T213000Z DTSTAMP:20260828T094430Z UID:ksqq1g3r21kovaq4cs7cses344@google.com CREATED:20150205T142658Z DESCRIPTION:Speaker Name: Dr. Phillip Sprangle\n\nSpeaker Institution : UMC P\n\nTitle : High Intensity Laser Propagation and Interactions\n\nAbstract : High intensity laser radiation sources cover a wide range of parameters\, e.g.\, peak powers from tera to peta watts\, pulse lengths from pico to fe mto seconds\, repetition rates ranging from kilo to mega hertz and average powers of many tens of watts. This talk will cover\, among other things\, some of the unique physical processes which result when high intensity lase r radiation interacts with gases and plasmas. One of the topics to be disc ussed is the propagation of these laser pulses in gases which results in a multitude of coupled linear and nonlinear processes including: self-focusin g\, filamentation and spectral broadening. This talk will also discuss som e potential applications of these high intensity lasers\, including: laser driven electron acceleration in plasma channels and the remote detection of radioactive material using electromagnetic signatures.\n\nNotes: For guest s attending the LPS seminar\, please use the phone on the left hand side of the front door to call the receptionist for entry. LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parki ng at the adjacent LTS building but not at the 4H building. LPS is on the U MCP shuttle route\; take #105 for the Courtyard Apts. LAST-MODIFIED:20150205T142659Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150513T193000Z DTEND:20150513T203000Z DTSTAMP:20260828T094430Z UID:n53j2nm7ddrqeapu2l2tkjnkig@google.com CREATED:20150511T130939Z DESCRIPTION:Speaker Name: Dr. Robert J. Burger \n\nSpeaker Institution: Far Light LLC\, Wilmington\, CA and Proxemics LLC\, Newton\, MA\n\nTitle: LED Applications in Solid State Aviation Lights and Intelligent Lighting System s \n\nAbstract : The device physics of LEDs and non-imaging optics will be discussed with a focus on solid state aviation lighting systems. The desig n of solid state intelligent lighting systems will be presented including s ynergies with aviation lighting. The perspective of an aviation lighting s ystems manufacturer will be presented with relation to practical real world needs of aviation navigation and obstruction avoidance. The testing and c ertification of LED aviation lights will be presented from the perspective of the manufacturer\, the testing laboratory and the regulatory authorities (FAA\, ICAO\, Transport Canada). The greater topic of how the market for intelligent lighting has evolved in response to the DOE 2007 directive on e nergy efficient lighting systems as well as how market forces are driving t he energy industry will be discussed. The discussion will cover solid stat e intelligent lighting infrastructure\, biome\, commoditization\, current r esearch\, opportunities (including the NAS and NEXTGEN) and future in combi nation with IoT and ubiquitous computing.\n\nNotes: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parki ng at the adjacent LTS building but not at the 4H building. LPS is on the U MCP shuttle route\; take #105 for the Courtyard Apts. Please use the phone on the left hand side of the front door to call the receptionist for entry. LAST-MODIFIED:20150511T130939Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150326T163000Z DTEND:20150326T174500Z DTSTAMP:20260828T094430Z UID:417lcl9ajgr9k07qat88lobb98@google.com CREATED:20150320T180514Z DESCRIPTION:Speaker Name: Brian Hunt\n\nSpeaker Institution : Department of Math\, UMD\n\nTitle: Defining Chaos LAST-MODIFIED:20150320T182404Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150403T170000Z DTEND:20150403T180000Z DTSTAMP:20260828T094430Z UID:vufgp20rd7l1p6gfo3ot5untig@google.com CREATED:20150327T185926Z DESCRIPTION:Speaker Name: Darrell G. Schlom\n\nSpeaker Institution : Cornel l University\n\nTitle : Thin-Film Alchemy: Using Strain and Dimensionality to Unleash the Hidden Properties of Oxides\n\nAbstract : Guided by theory\, unparalleled properties—those of hidden ground states—are being unleashed by exploiting large strains in concert with the ability to precisely contro l dimensionality in epitaxial oxide heterostructures. For example\, materia ls that are not ferroelectric or ferromagnetic in their unstrained state ca n be transmuted into ferroelectrics\, ferromagnets\, or materials that are both at the same time. Similarly\, new tunable dielectrics with unparallel ed performance have been created. Results of fundamental scientific import ance as well as revealing the tremendous potential of utilizing multicompon ent oxide thin films to create devices with enhanced performance will be sh own. LAST-MODIFIED:20150327T190629Z LOCATION:Room 2108 Chemical & Nuclear Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140904T193000Z DTEND:20140904T203000Z DTSTAMP:20260828T094430Z UID:vrfcvnons0ule2b27e24ll5akk@google.com CREATED:20140827T135621Z DESCRIPTION:contact jmr@math.umd.edu for more information \n\nJoin with Goo gle Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/organi zational?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29v Z2xlLmNvbQ.vrfcvnons0ule2b27e24ll5akk&hs=121 LAST-MODIFIED:20140829T193339Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Organizational Meeting (RIT on Geometry and Physics) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151008T180000Z DTEND:20151008T193000Z DTSTAMP:20260828T094430Z UID:hul8mkmomqb07g56723nigadg0@google.com CREATED:20150728T163646Z DESCRIPTION:SPEAKER: Connie H. Li\, Naval Research Laboratory\n\nTITLE: D irect electrical detection of spin-momentum locking in topological insulato rs\n\nABSTRACT: Topological insulator (TI) is a new quantum state of matte r characterized by an insulating bulk with metallic surface states populate d by massless Dirac fermions. One of its most striking properties is that o f spin-momentum locking - the spin of the TI surface state lies in-plane\, and is locked at right angle to the carrier momentum. An unpolarized charg e current should thus create a net spin polarization whose amplitude and or ientation are controlled by the charge current. This remarkable property h as been anticipated by theory\, but never accessed in a simple transport st ructure. Here we show that a bias current indeed produces a net surface st ate spin polarization via spin-momentum locking in molecular beam epitaxial ly grown Bi2Se3 films\, and this polarization is directly manifested as a v oltage on a ferromagnetic metal contact. This voltage is proportional to t he projection of the TI spin onto the contact magnetization\, is determined by the direction and magnitude of the bias current\, with a sign expected from spin-momentum locking rather than Rashba effects. Further demonstratio n of this direct electrical detection of spin-momentum locking in a p-type TI\, as well as the spin-to-charge conversion via the inverse Elderstein ef fect will also be briefly discussed. These results demonstrate direct elect rical access to the TI surface state spin system and enable utilization of its remarkable properties for future technological applications.\n\nHOST: Ted Einstein LAST-MODIFIED:20151002T222528Z LOCATION:John S Toll Physics Building Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Connie H. Li\, Naval Research Laboratory TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120920T183000Z DTEND:20120920T193000Z DTSTAMP:20260828T094430Z UID:kjaf48jc4vi4iod1eiqjr8db9s@google.com CREATED:20120904T201317Z DESCRIPTION:SPEAKER: Paul Romatschke - University of Colorado at Boulder\n TITLE: In search of the perfect fluid\nABSTRACT: There are good fluids and not so good fluids\, as anyone trying to empty an old jar of honey will at test. Good fluids are characterized by having a low viscosity coefficient. Experimentally one finds that viscosity can reach arbitrarily high values f or different fluids. However\, the converse is not true: it is hard to find fluids with a viscosity coefficient lower than that of water. Until the en d of last century\, one of the record holders for low viscosity values was fluid helium\, but with the advent of heavy-ion colliders and ultracold ato mic gas experiments this has changed. I will lead you on a search for the " perfect fluid"\, using results from fields as different as relativistic flu id dynamics\, string theory\, high energy nuclear physics and atomic physic s along the way. LAST-MODIFIED:20120904T201533Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150929T150000Z DTEND:20150929T163000Z DTSTAMP:20260828T094430Z UID:24qh10gflg29lnim5remdd6es8@google.com CREATED:20150918T205407Z DESCRIPTION:Speaker: Srinivas Raghu (Stanford)\n\nTitle: Composite fermions and the field-tuned superconductor-insulator transition\n\nAbstract: In se veral two-dimensional films exhibiting a magnetic field-tuned superconducto r to insulator transition (SIT)\, stable metallic phases have been observed . Building on the 'dirty boson' description of the SIT\, we suggest that t he metallic region is analogous to the composite Fermi liquid observed abou t half-filled Landau levels of the two-dimensional electron gas. The compo site fermions near the SIT are mobile vortices attached to one flux quantum of an emergent gauge field. This composite vortex liquid is a 2D non-Ferm i liquid metal\, which is stable to weak quenched disorder. This picture o f an emergent composite vortex liquid has several experimental consequences which we describe.\n\nHost: Jed Pixley\n\nhttp://www.physics.umd.edu/cmtc/ seminars.html LAST-MODIFIED:20150918T205407Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160211T200000Z DTEND:20160211T213000Z DTSTAMP:20260828T094430Z UID:5195anhdhdcelf4c5u4fbfe28k@google.com CREATED:20160205T140555Z DESCRIPTION:Speaker: Roberto Franceschini\n\nSpeaker Institution: CERN\n\nT itle: Shifting the fundamental physics frontiers with spectacular signals a nd precision at present colliders and beyond\n \nAbstract: In my talk I wil l describe recent progress and the present frontier of the understanding of the most fundamental laws of Nature\, focusing especially on recent discov eries at particle colliders\, and on the astonishing precision with which t he Standard Model of particle physics has been verified at the Large Hadron Collider. \nStarting from these results I will present the great questions that are left to us too seek an answer for\, and the experimental means we can use to attack these questions. I will discuss in detail the role playe d by present and future collider machines and my plans to search for new ph ysics with these machines looking for distinctive and spectacular signature s. \nIn addition\, I will present my ideas on how to search for more subtle signatures of new physics enabled by the recently proven high-precision un derstanding of hadron collisions in the Standard Model up to multi-TeV ener gy scale. Concentrating on the top quark sector and new physics related to it\, I will illustrate how\, leveraging precision\, it is possible to disc over new physics in scenarios otherwise hard to detect. This strategy of se arch will inevitably sharpen our control on “old” physics\, opening the way to understanding the next layer of fundamental interactions by accurately measuring new physics particles masses and couplings and enabling even more precise understanding of particle physics process relevant beyond new phys ics searches and outside the domain of colliders physics. LAST-MODIFIED:20160208T220309Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141211T190000Z DTEND:20141211T200000Z DTSTAMP:20260828T094430Z UID:4fl9qpu7pdq78fom61er30595g@google.com CREATED:20141030T162928Z DESCRIPTION:SPEAKER: Nadya Mason\, University of Illinois\n\nTITLE: Desig ning Superconductivity: Manipulating Interactions in Arrays of Superconduct ing Islands\n\nABSTRACT: In this talk\, I will discuss an approach to tuni ng the parameters relevant to 2D superconductivity—such as disorder\, dissi pation\, and phase separation—via mesoscale superconducting islands. I will discuss the mechanism behind the suppression of superconductivity in indiv idual islands\, even at large diameters. I will then discuss the behavior of large arrays of the superconducting islands patterned on normal metal fi lms\; by changing the size and configuration of the islands\, we can contro llably change the superconducting correlations and thus the properties of t he system. I will discuss electrical transport measurements of these system s\, including characterization of the superconducting transitions\, vortex dynamics in finite magnetic-fields\, and evidence that the system approache s an unusual metallic ground state as the island spacing is increased. \n\n \nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics .umd.edu/cnam-colloquium?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAu Y2FsZW5kYXIuZ29vZ2xlLmNvbQ.4fl9qpu7pdq78fom61er30595g&hs=121 LAST-MODIFIED:20141205T193731Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T200000Z DTEND:20140327T213000Z DTSTAMP:20260828T094430Z UID:s6g6ikfc3o8d5vu24thk0g14tg@google.com CREATED:20140310T165325Z DESCRIPTION:Speaker Name: Andreas Karch\n\nSpeaker Institution: University of Washington\n\nTitle: Recent Progress in Applications of the Gauge/Gravit y\nCorrespondence\n\nAbstract: I'll give a brief overview of the basic phil osophy behind\napplying the gauge/gravity correspondence (or holography for short) to\nproblems in nuclear and condensed matter physics. Progress\nreg arding viscosities\, energy loss\, non-Landau phase transitions\,\nnon-Ferm i liquids\, topological insulators and non-equilibrium physics\nwill be rev iewed. I'll discuss to what extend these theoretical developments can be us ed to explain experimental data from the heavy-ion experiments at RHIC or L HC\, as well as the phase structure of high-Tc superconductors or other str ongly correlated systems. I'll end with an outlook on future prospects of t he field. LAST-MODIFIED:20140311T175401Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151209T200000Z DTEND:20151209T210000Z DTSTAMP:20260828T094430Z UID:56japb5jv1vp9gikk5jebhmm0o@google.com CREATED:20151203T135103Z DESCRIPTION:Speaker Name: Professor Ki-Yong Kim\n\\\nSpeaker Institution : Department of Physics\, University of Maryland\n\nTitle : Laser-based\, hig h-power terahertz wave generation and characterization\n\nAbstract : Sandwi ched between the optical and microwave regimes\, the far infrared or terahe rtz (THz) frequency range has recently drawn special attention due to its u biquitous nature and broad applications. The physics of THz generation is a lso compelling\, raising fundamental questions about the interaction of str ong electromagnetic fields with atoms and molecules. In particular\, high-p ower THz generation is vital for applications in nonlinear THz optics and s pectroscopy\, and so there is a growing demand for intense\, compact THz so urces. One approach is to use tabletop\, ultrashort-pulsed lasers to produc e coherent THz radiation via high field plasma generation in gases\, but th e physics of the process is not fully understood and requires detailed unde rstanding of strong field ionization processes in atoms and molecules. In a ddition\, there are practical issues to address—Can one control and optimiz e the process to make compact high-power THz sources? What are the limits o n g! enerating and detecting ultra-broadband THz radiation? What interestin g nonlinear processes can be driven by powerful THz sources? All these ques tions will be addressed in this talk. LAST-MODIFIED:20151203T135103Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T173000Z DTEND:20140512T190000Z DTSTAMP:20260828T094430Z UID:1bf8r833bcg4dqntva5keku73o@google.com CREATED:20140415T204552Z DESCRIPTION:**Please note new location**\n\nSpeaker Name: Norman Christ\n\n Speaker Institution:Columbia\n\nTitle: Computing the two-pion decay of the kaon and the neutral kaon mass difference using lattice QCD\n\nAbstract: Th e methods of lattice QCD and available computer resources are\nnow sufficie nt that the predictions of the standard model for the\ntwo-pion decays and mixings of the K mesons can be determined\nwith controlled errors in the ne xt few years using lattice QCD.\nThese methods and prospects will be descri bed including physical\nresults for the complex I=2 decay amplitude A2 and exploratory\nstudies illuminating the Delta I = ½ rule and giving the long- distance\ncontribution to the neutral kaon mass difference. Finally\, a ne w\ncalculation of the complex\, I=0 amplitude A0 using physical kinematics\ nand G-parity boundary conditions now underway will be explained LAST-MODIFIED:20140509T160224Z LOCATION:PSC 3132 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141103T210000Z DTEND:20141103T220000Z DTSTAMP:20260828T094430Z UID:jj4i6evnu5fc3f8e9qb6k3u0e0@google.com CREATED:20141027T172838Z DESCRIPTION:Speaker Name: Christian Kaiser\n\nSpeaker Institution : John Ho pkins University\n\nTitle: Coupling of protein synthesis and folding: Pull ing on single nascent chains with optical tweezers\n\nAbstract : Proteins a re synthesized by the ribosome and must generally fold to become functional ly active. Nascent protein folding can begin before synthesis is complete\, but it has been very difficult to study the mechanisms and consequences of folding on the ribosome. We have developed an experimental system utilizin g optical tweezers to follow nascent protein folding\, which allows us to o bserve the folding of single nascent protein molecules in real time. We fin d that the ribosome slows the formation of stable tertiary interactions and decelerates both folding and misfolding of T4 lysozyme\, the model protein used in our initial studies. Our results demonstrate that the ribosome not only decodes the genetic information and synthesizes polypeptides\, but al so promotes efficient de novo protein folding to the native state. Interest ingly\, we also found that nascent protein folding can\, in turn\, regulate ribosome activity. Interactions between the nascent chain and the polypept ide exit tunnel in the ribosome can cause decreased elongation rates and ev en arrest. We show that nascent chain folding in the vicinity of the riboso mal tunnel exit releases arrest by generating mechanical force. Our results provide mechanistic insight into how nascent chain folding and elongation are coupled during protein synthesis by the ribosome.\n\n\n\nJoin with Goog le Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/biophys ics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlL mNvbQ.jj4i6evnu5fc3f8e9qb6k3u0e0&hs=121 LAST-MODIFIED:20141027T172838Z LOCATION:0112 Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140416T200000Z DTEND:20140416T210000Z DTSTAMP:20260828T094430Z UID:t6afap6gloghr4kthtdpbqdccg@google.com CREATED:20140410T171332Z DESCRIPTION:Speaker Name: Brian Baughman\n\nSpeaker Institution : Universit y of Maryland\n\nTitle: First Results from the High-Altitude Water Cherenk ov Observatory\n\nAbstract : The High Altitude Water Cherenkov Observatory (HAWC) is an international collaboration between the USA and Mexico.\nIt is currently being deployed on the Sierra Negra plateau (4100 m a.s.l.)\, Pue bla\, Mexico.\nOnce completed in late 2014 HAWC will consist of 300 Water C herenkov Detectors totaling approximately 22\,000 m^2 of instrumented area. \nHAWC is unique among TeV gamma-ray instruments since it can observe large portions of the sky in a 24 hour time period making it particularly well s uited at measuring extended and large-scale structures in the sky and actin g as an excellent visible sky transient monitor.\n\nData taking started on August\, 2012 with a partially constructed detector and continues today wit h an increasingly more sensitive detector.\nThe most recent results of thes e data will be presented within the context of HAWC’s long term science goa ls and the broader GeV-TeV community.\n\n\n LAST-MODIFIED:20140410T192244Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP/PA Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150309T200000Z DTEND:20150309T213000Z DTSTAMP:20260828T094430Z UID:u8mclj4hl2j60abcg0vstr03hc@google.com CREATED:20150223T151139Z DESCRIPTION:Title: The Galactic Center GeV Gamma-ray Excess: Have We Starte d to See Dark Matter?\n\nSpeaker: Sam McDermott\, Stony Brook University\n\ nAbstract: Recent claims of an excess of gamma rays from the Galactic cente r have grown in statistical significance over the last few years. In this t alk\, I’ll provide a (fairly optimistic) summary of the observational and p henomenological work relating to the Galactic center GeV excess. This will necessitate an up-to-date discussion of the claims in the literature\, and will also include discussion of some particle physics models that can provi de a basis for the signal. I’ll go on to discuss ideas for new techniques t hat might help push us toward a deeper understanding of the signal and its phenomenology.\n\nJoin with Google Hangouts: https://hangouts.google.com/ha ngouts/_/physics.umd.edu/sam-mcdermott?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0am Z1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.u8mclj4hl2j60abcg0vstr03hc&hs=121 LAST-MODIFIED:20150223T165615Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150310T171500Z DTEND:20150310T183000Z DTSTAMP:20260828T094430Z UID:b7o810uppnhokkaka11c5cus1o@google.com CREATED:20150303T162115Z DESCRIPTION:Speaker Name: Dr. Andre Cardoso Barato\n\nSpeaker Institution : University of Stuttgart\n\nTitle : Thermodynamic Uncertainty Relation for Biomolecular Processes\n\nAbstract : Biomolecular systems like molecular mo tors or pumps\, transcription and translation machinery\, and other enzymat ic reactions can be described as Markov processes on a suitable network. We show quite generally that in a steady state the dispersion of observables like the number of consumed/produced molecules or the number of steps of a motor is constrained by the thermodynamic cost of generating it. An uncerta inty ε requires at least a cost of 2kBT/ε2 independent of the time required to generate the output. We also obtain a lower bound on the Fano factor\, which is an observable quantifying fluctuations that can be measured in sin gle molecule experiments. This lower bound depends on the affinity driving the process out of equilibrium\n\n LAST-MODIFIED:20150303T162115Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141201T160000Z DTEND:20141201T170000Z DTSTAMP:20260828T094430Z UID:qlsf7bt571cbakmk9i431v6q8g@google.com CREATED:20140711T173045Z DESCRIPTION:Speakers\, Titles and Abstracts to follow\n\nJoin with Google H angouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-postdoc ?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNv bQ.qlsf7bt571cbakmk9i431v6q8g&hs=121 LAST-MODIFIED:20140711T173045Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI PostDoc Seminars TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140224T183000Z DTEND:20140224T193000Z DTSTAMP:20260828T094430Z UID:0jj82prl71cb9nhl1jfn4tkr48@google.com CREATED:20140122T210120Z DESCRIPTION:Title: Thermonuclear burning in the envelope of accreting neutr on stars: uncertainties from nuclear physics\n\nSpeaker: Laurens Keek\, Geo rgia Tech\n\nAbstract: Type I X-ray bursts are the most common thermonuclea r explosions in the\nuniverse. They result from the runaway burning of hydr ogen and helium\naccreted onto the surface of a neutron star\, where the st rong gravity\nquickly compresses the material to the point where fusion sta rts. Their\nobservation constrains nuclear physics at high density involvin g heavy\nproton-rich nuclei. The uncertainties in many reaction rates is su bstantial\, and we discuss how this affects one of the major challenges for X-ray burst theory: explaining the observed transition from X-ray bursts t o stable burning. Furthermore\, we investigate how a new theoretical predic tion of the helium-burning (triple-alpha) reaction rate changes the occurre nce of deep helium ignition\, which is thought to produce rare long "interm ediate-duration" bursts. LAST-MODIFIED:20140220T175809Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140411T143000Z DTEND:20140411T153000Z DTSTAMP:20260828T094430Z UID:nq6jqml0o1rmttn8i4d5kfpv20@google.com CREATED:20140404T151716Z DESCRIPTION:Speaker: Michael Jarret Baume\, JQI\n\nAbstract:The quantum adi abatic theorem upper bounds the runtime of an adiabatic optimization algori thm by O(1/γ^3). Here\, γ represents the minimal difference between the two lowest eigenvalues (the gap) of the associated Hamiltonian over the course of its evolution. Thus\, the problem of upper bounding the runtime of an a diabatic algorithm reduces to that of lower bounding the eigenvalue gap. De spite some notable successes\, this has historically proven to be a very di fficult problem. In a recent breakthrough result\, Andrews and Clutterbuck proved such a bound -- the longstanding Fundamental Gap Conjecture -- for c ontinuum Hamiltonians. Unlike their result\, however\, we are interested in developing gap-bounding tools for the discrete setting. Of particular inte rest is the case of graph Laplacians with "convex" potentials.\n\nIn this t alk I will present a brief overview of adiabatic algorithms and history of the Fundamental Gap Theorem. I will then introduce the concept of a graph L aplacian with a "convex" potential and the linear equations solved by such a Hamiltonian. Using the Hellman-Feynman theorem and variational techniques \, I will sketch a proof of the gap bound of the path graph (a discrete ana logue of the one dimensional Fundamental Gap Theorem) and the Hypercube gra ph.\n\nIn both of the above cases\, from the perspective of runtime\, the g ap is demonstrably "large." One is then tempted to conjecture that all grap hs with "convex" potentials have correspondingly large gaps. I will demonst rate that\, at least under a naive definition of convexity\, this is false and present a case where a convex potential results in an exponentially sma ll gap. Using methods originally employed in the analysis of Markov chains\ , I will show that the gaps of general graphs can be bounded\, provided tha t the ground-state is "single-peaked."\n\nThis is joint work with Stephen J ordan\n LAST-MODIFIED:20140410T193803Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150924T180000Z DTEND:20150924T193000Z DTSTAMP:20260828T094430Z UID:dh847kt1m1do0p8ah787a1ootg@google.com CREATED:20150729T181319Z DESCRIPTION:SPEAKER: Alex Grutter\, NRC Postdoc @ NCNR\nTITLE: “Engineeri ng Functional Magnetic Properties through Interfacial Discontinuities”\n\nA BSTRACT: In the search for materials with which to build next-generation s pintronic devices\, the discovery of unexpected electronic and magnetic beh avior at atomically sharp perovskite oxide interfaces has generated conside rable excitement. In these new low-dimensional materials the mismatch of ba nds\, oxidation states\, and interaction lengths at interfaces gives rise t o emergent behavior not found in the bulk\, such as the stabilization of fe rromagnetism at the interface between CaRuO3\, a paramagnetic metal\, and C aMnO3\, an antiferromagnetic insulator. Although the origins and underlying physics of these interfaces are not yet well understood\, such effects sug gest new methods of engineering functional interfaces by tuning the magneti c properties of these systems. In this talk we will discuss the emergence o f interfacial magnetic states which are highly sensitive to changes in inte rfacial symmetry\, applied electric fields\, and artificially induced chemi cal migration. We will show several unexpected mechanisms by which we may c ontrol the ferromagnetism at complex oxide interfaces\, demonstrating the t unability which make this class of materials so desirable for integration i nto magnetic logic systems.\n\n\nHOST: Nick Butch LAST-MODIFIED:20150917T171011Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Alex Grutter\, NCNR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140203T210000Z DTEND:20140203T223000Z DTSTAMP:20260828T094430Z UID:phg2lknsade2up2en496hppi0k@google.com CREATED:20140128T183745Z DESCRIPTION:Title : Bacterial Shape Maintenance Through Feedback Between Ce ll Curvature and Cytoskeletal Localization\n\nSpeaker Name: K C Huang\n\nSp eaker Institution : Stanford University\n\nNotes: Refreshments at 3:45pm\n LAST-MODIFIED:20140203T150630Z LOCATION:Room 0112 Chemistry Bldg. (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140904T163000Z DTEND:20140904T173000Z DTSTAMP:20260828T094430Z UID:2incjfcge5rs6al2scpcsidrls@google.com CREATED:20140826T193617Z DESCRIPTION:Speaker Name: Yue-Kin Tsang\n\nSpeaker Institution: University of Edinburgh\n\nTitle: "Advection-condensation of water vapor in a model of coherent stiring" and "An energy-enstrophy method for nonlinear stability in two-dimensional hydrodynamics"\n\n\n\n\nJoin with Google Hangouts: https ://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1Y jhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.2incjfcge5rs6al2s cpcsidrls&hs=121 LAST-MODIFIED:20140829T203034Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminars TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141124T213000Z DTEND:20141124T223000Z DTSTAMP:20260828T094430Z UID:nvv3p1klarjshal6htov4bchc8@google.com CREATED:20141013T180732Z DESCRIPTION:Speaker Name: Aram Vartanyan\n\nSpeaker Institution: University of Maryland\n\nTitle: Whistler Wave Generation by Continuous High Frequenc y Heating of the Upper Ionosphere\n\nAbstract: We present the very first cl ear experimental observations of whistler waves generated by continuous hea ting of the upper ionosphere using the HAARP facility. The proposed generat ion mechanism relies on parametrically excited Lower-Hybrid (LH) waves and their linear and non-linear mode-conversion to whistler waves. After genera lizing an existing LH-whistler conversion model\, simulation results are pr esented that are in good agreement with the observed whistler wave spectrum . A combination of qualitative discussions and simulation results explains certain peculiarities observed in the spectrum.\n\nNotes: Coffee\, Tea & Co okies 4:15-4:30 PM\n\n\n\nJoin with Google Hangouts: https://hangouts.googl e.com/hangouts/_/physics.umd.edu/space-and?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.nvv3p1klarjshal6htov4bchc8&hs= 121 LAST-MODIFIED:20141119T213516Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150601T150000Z DTEND:20150601T160000Z DTSTAMP:20260828T094430Z UID:h5vgs872e3ksb46eb73pq3q244@google.com CLASS:PUBLIC CREATED:20150526T174728Z DESCRIPTION:Speaker: Javad Shabani\, UCSB and CCNY\n\nTitle: Two dimensiona l epitaxial InAs-Al superconducting systems\n\nAbstract: It has been recent ly realized that materials with strong spin orbit coupling can lead to nove l states of matter such as topological insulators and superconductors. This exciting development might lead to a number of useful applications ranging from spintronics to quantum computing. Here\, we present epitaxial growth of near surface InAs heterostructures where the structures are designed suc h that the charge distribution is mainly confined in InAs but has a non-zer o value at the surface. This band engineering allows us to make ohmic conta ct to the 2DES while keeping the electron mobilities well above traditional surface structures. In addition\, the Rashba parameter measured from weak antilocalization analysis exhibit a very large spin-orbit coupling due to h ighly asymmetric potentials near surface. We also show that near perfect in terface and a highly transparent contact can be achieved using epitaxial gr owth of aluminum on near-surface InAs 2DESs. Indeed\, superconductor-semico nductor-superconductor junctions fabricated on these wafers exhibit a super current with superior properties compared to ex-situ deposition of supercon ducting metals. The supercurrent flowing through the semiconductor can be c ontrolled by a gate voltage making a transistor where the current can be tu rned “off” and “on”. Our results show that these new systems could provide new possibilities to study new quantum transport phenomena in addition to t opological superconductivity. LAST-MODIFIED:20150526T174728Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141016T180000Z DTEND:20141016T193000Z DTSTAMP:20260828T094430Z UID:mal7agv4l3qtbjtgb7st9kttlk@google.com CREATED:20140828T214840Z DESCRIPTION:Speaker:DAN DOUGHERTY\, NC State Department of Physics\n\nTitl e: Indirect Coupling of an Organic Semiconductor to a Magnetic Surface Stat e\n\nAbstract: Organic semiconductor spin valves show unexpectedly large m agnetoresistive effects that suggest these materials in spintronic applicat ions [1]. Organic semiconductors operate in a nondiffusive "hopping" trans port regime that is distinct from transport in more typical metal and inorg anic semiconductor spintronic devices. Direct electrical spin injection to these materials is thus not limited by traditional conductivity mismatch [ 2] and this may lead to new opportunities in spintronic device creation. I t is particularly attractive to imagine using spin-dependent metal-molecule interfacial bonding to optimize spin injection and control interfacial spi n polarizations [3].\nI’ll describe scanning tunneling microscopy and spect roscopy experiments that probe the electronic structure at model organic sp intronics interfaces. We observe a planar organic molecule\, “PTCDA”\, ads orbed on Cr(001) and find a similar occupied density of states to PTCDA ads orption on Ag(111) where the molecule accepts significant charge density fr om the sp band of the substrate. Remarkably\, the molecule also broadens t he spin polarized "Orbital Kondo" state [4] near the Fermi level on Cr(001) in a very non-local fashion up to 5 nm from its adsorption site. We inter pret this observation as arising from the molecular distortion of the Cr sp band that indirectly alters the orbital Kondo resonance.\n\n[1] Dediu et a l.\, Nat. Materials 8\, 707 (2009).\n[2] Schmidt\, J. Phys. D: Appl. Phys 3 8\, R107 (2005).\n[3] Barraud et al.\, Nat. Phys. 6\,615 (2010).\n[4] Koles nychenko et al.\, Nature 415\, 507 (2002).\n\nHOST: Ted Einstein\n\nJoin w ith Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu /msutton2?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29 vZ2xlLmNvbQ.mal7agv4l3qtbjtgb7st9kttlk&hs=121 LAST-MODIFIED:20141009T221715Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151111T180000Z DTEND:20151111T190000Z DTSTAMP:20260828T094430Z UID:i7gjsvvl1n3d0dtl1eidt6i8nk@google.com CREATED:20151106T193442Z DESCRIPTION:Ashok Ajoy\, MIT\n\nHamiltonian engineering for quantum simulat ion and metrology\n\nIn this talk\, I will present some of our recent work in developing quantum control schemes for engineering Hamiltonians\, with a pplications in quantum metrology and simulation. Specifically\, I will desc ribe a technique of Hamiltonian "interpolation" to enhance the resolution o f interference based quantum metrology. Experimentally we achieve through t his a resolution boost of about 100x in NV center assisted magnetometry. I will also describe some ideas for the efficient quantum simulation 2D neare st neighbor Hamiltonian models from a linear chain of ions\, with potential applications in simulating topological physics with the exquisite quantum system offered by the 1D ion trap. LAST-MODIFIED:20151106T193926Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141002T173000Z DTEND:20141002T180000Z DTSTAMP:20260828T094430Z UID:068ajbhj1u18shs06fjb9hut4c@google.com CREATED:20140828T213918Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.068ajbhj1u18shs06fjb9hut4c&hs=121 LAST-MODIFIED:20140828T213918Z LOCATION:physics room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150331T150000Z DTEND:20150331T160000Z DTSTAMP:20260828T094430Z UID:5l2t45an0lsa9a0mh5e0a26q94@google.com CLASS:PUBLIC CREATED:20150327T144139Z DESCRIPTION:Speaker: Anja Metelmann\, McGill University\n\nTitle: Nonrecipr ocal photon transmission and amplification via reservoir engineering\n\nAbs tract: The general desire to break reciprocity in engineered photonic stru ctures has garnered an immense amount of recent interest. For example non reciprocal microwave-frequency devices are crucial to efforts at quantum-in formation processing with superconducting circuits. We discuss a general me thod for constructing nonreciprocal\, cavity-based photonic devices\, based on matching a given coherent interaction with its corresponding dissipativ e counterpart\; it generalizes the basic structure used in the theory of c ascaded quantum systems. In contrast to interference-based schemes\, our ap proach allows directional behaviour over a wide bandwidth. We show how it c an be used to devise isolators and directional\, quantum-limited amplifiers\ ; of particular interest is a directional phase-sensitive amplifier which is not limited by any fundamental gain-bandwidth constraint. Our approach is particularly well-suited to implementations using superconducting microwave circuits. LAST-MODIFIED:20150327T144139Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150421T150000Z DTEND:20150421T160000Z DTSTAMP:20260828T094430Z UID:01882jo29q5iki6rngh9fc99q0@google.com CREATED:20150413T144354Z DESCRIPTION:Speaker Name: Johannes Bauer \n\nSpeaker Institution: Harvard\n \nTitle: Phases and dynamics of correlated systems: Charge order in the cup rate superconductors and dynamic phase transitions\n\nAbstract: The first p art of the talk addresses the physics of the cuprate superconductors. I wil l review some recent experimental evidence for incommensurate charge order in the pseudogap phase of various compounds. Motivated by these observation s\, we performed a number of complementary computations to analyze charge-n eutral\, spin-singlet ordering in metals on the square lattice taking into account correlation effects. We examined ordering with and without time-rev ersal symmetry\, with arbitrary wave-vector and tunable form factor. Depend ing on the model parameters\, we find a variety of different charge orderin g possibilities including ones with wave-vectors parallel to the lattice ge nerators and a d-wave form factor. The relation of these findings to the ex periments is discussed. The second part of the talk deals with the non-equi librium dynamics of spontaneous symmetry breaking for interacting fermions motivated by experiments with ultracold atoms. Within a Keldysh perturbatio n theory we compute single and two-particle dynamics of fermions on a latti ce after a fast interaction ramp close to a magnetic instability. This allo ws us to analyze the interplay of thermalization processes with the growth of unstable magnetic modes and to establish a dynamic phase diagram.\n\nHos t: Philip Brydon\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150421T141131Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151123T210000Z DTEND:20151123T220000Z DTSTAMP:20260828T094430Z UID:k9ovhsvp3gl7sb3b77mno3udq4@google.com CREATED:20151119T174043Z DESCRIPTION:Speaker Name: Alexander\, Wlodawer\n\nSpeaker Institution : NIH \n\nTitle : Plant proteins with medically important properties: structural studies of three members of the β-trefoil family that function as serine pr otease inhibitors or as lectins LAST-MODIFIED:20151119T202934Z LOCATION:0112 CHEM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150313T150000Z DTEND:20150313T160000Z DTSTAMP:20260828T094430Z UID:a64v9jauhnnaoa0j7832s1oesk@google.com CREATED:20150309T145521Z DESCRIPTION:Speaker Name: Prof. Frank Jenko\n\nSpeaker Institution : UCLA\n \nTitle : Turbulence and self-organization in complex systems: On the relat ion between astrophysical plasmas and bacterial suspensions\n\nAbstract: It is widely recognized that turbulence is an important and exciting frontier topic of both basic and applied plasma physics - as well as of many neighb oring fields of science. Numerous aspects of this paradigmatic example of n onlinear multiscale dynamics remain to be better understood. Meanwhile\, fo r both laboratory and natural plasmas\, an impressive combination of new ex perimental and observational data\, new theoretical concepts\, and new comp utational capabilities have and will become available. Thus\, we are facing a unique window of opportunity to push the boundaries of our grasp of plas ma turbulence. I will describe recent advances and future challenges in thi s vibrant area of research\, focusing on novel insights into the redistribu tion and dissipation of energy in turbulent plasmas at kinetic scales. Inte restingly\, certain insights and concepts developed in this area of physics can be transferred to others\, like biophysics\, allowing for cross-fertil ization and the development of a unifying view on seemingly disparate field s of science.\n\n\n\n LAST-MODIFIED:20150309T191744Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140324T203000Z DTEND:20140324T213000Z DTSTAMP:20260828T094430Z UID:laeru6756nehn1ppcdi5ojn7r0@google.com CREATED:20140220T213539Z DESCRIPTION:Speaker Name: Keith Strong and Julia Saba\n\nSpeaker Institutio n : NASA Goddard Space Flight Center and Univ. of Maryland Astronomy Dept.\ n\nTitle : The Solar Cycle Conundrum\n\nAbstract : We have known for 170 ye ars that sunspots come and go on a roughly 11-year timescale. Despite many efforts to develop empirical or physical models of the solar cycle\, we hav e failed to find a method of predicting the timing or amplitude of an upcom ing solar cycle with any degree of confidence. While this was once consider ed an interesting intellectual exercise to test how well we understood the inner workings of the Sun\, it now has become an important economic issue a s our dependence on space technology increases. The vulnerability of over $ 1T in space assets to space weather effects increases with the solar activi ty levels that are driven by the solar cycle. \nThe Sun is a magnetic varia ble star so we will look at the basic characteristics of the solar dynamo t hat have to be reproduced by any viable solar cycle model. Then we will bri efly discuss some of the techniques used to predict solar activity and see how well they have done so far in predicting the current solar cycle. Using extended observations of the Sun's magnetic field from SOHO and various gr ound-based observatories in conjunction with coronal imaging has led us to find some new patterns in solar activity that have shown promise in predict ing certain aspects of the solar cycle.\n\nNotes: Coffee\, Tea & Cookies 4: 15-4:30 PM LAST-MODIFIED:20140220T213539Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160225T190000Z DTEND:20160225T200000Z DTSTAMP:20260828T094430Z UID:njvgt7ijncglod6tcrfcmt2r7g@google.com CREATED:20151105T224850Z DESCRIPTION:Speaker Name: Stenen Disseler\, NIST\n\nTitle: Multiferroicit y in Hexagonal Ferrites\n\nAbstract: Materials exhibiting simultaneous magn etic and ferroelectric orders are quite rare in nature\, but hold immense p romise for next-generation memory and device applications. A common problem with most known multiferroics\, however\, is that they are either antiferr omagnetic\, with no easily switchable ferroic moment\, or only occur with s ignificant magnetoelectric coupling at extremely low temperatures. Thus\, t here has been a tremendous resurgence in recent years to discover new mater ials and heterostructured systems that exhibit both ferromagnetism and stro ng coupling between magnetic and ferroelectric or piezoelectric orders. In this talk\, I will present our work on a new family of multiferroic materia ls based on the normally metastable hexagonal oxide LuFeO3\, stabilized thr ough thin-film epitaxy and solid-state synthesis. In both cases\, we find t he material is an improper ferroelectric at high temperatures\, with weak f erromagnetic moment parallel to the ferroelectric axis below room temperatu re\, consistent with theoretical calculations. I will discuss our proposed mechanism to enhance the onset of magnetic order in this class of material s\, as well as our recent approach using oxide heterostructures based on th is material framework.\n\nHost: Nick Butch LAST-MODIFIED:20160219T202838Z LOCATION:room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Steven Disseler\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150414T171500Z DTEND:20150414T183000Z DTSTAMP:20260828T094430Z UID:0lhoevp46rj3m0g6o6da23vn20@google.com CREATED:20150401T143743Z DESCRIPTION:Speaker Name: Dr. Safa Motesharrei\n\nSpeaker Institution : Uni versity of Maryland\n\nTitle : Human and Nature Dynamics (HANDY): Modeling Inequality and Use of Resources in the Collapse or Sustainability of Societ ies.\n\nAbstract : There are widespread concerns that current trends in res ource-use are unsustainable\, but possibilities of overshoot/collapse remai n controversial. Collapses have occurred frequently in history\, often foll owed by centuries of economic\, intellectual\, and population decline. Many different natural and social phenomena have been invoked to explain specif ic collapses\, but a general explanation remains elusive. \n\nIn this talk\ , we will introduce a human population dynamics model by adding accumulated wealth and economic inequality to a predator-prey model of humans and natu re. The model structure\, and simulated scenarios that offer significant im plications\, are explained. Four equations describe the evolution of Elites \, Commoners\, Nature\, and Wealth. The model shows Economic Stratification or Ecological Strain can independently lead to collapse\, in agreement wit h the historical record. Also\, an extension of the model shows that includ ing nonrenewable resources could increase the peak pre-collapse population by about a factor of 20 and delay the collapse by a few centuries. \n\nThe measure "Carrying Capacity" is developed and its estimation is shown to be a practical means for early detection of a collapse. Mechanisms leading to two types of collapses are discussed. The new dynamics of this model can al so reproduce the irreversible collapses found in history. Collapse can be a voided\, and population can reach a steady state at maximum carrying capaci ty if the rate of depletion of nature is reduced to a sustainable level and if resources are distributed equitably.\n LAST-MODIFIED:20150401T143743Z LOCATION:Room 1116\, IPST Building #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150925T160000Z DTEND:20150925T170000Z DTSTAMP:20260828T094430Z UID:rshe9hi55o8tfi20q2q3mf5rk4@google.com CLASS:PUBLIC CREATED:20150918T123421Z DESCRIPTION:Speaker Name: Guanyu Zhu\, JQI\n\n(Free lunch served at 11:45)\ n\nTitle: Topological self-correcting quantum memory\n\nAbstract: In this t alk\, I will give an introduction to the concept of a topological self-corr ecting quantum memory\, which is a hardware approach to fault-tolerant quan tum computation. The essence of such an approach is to implement a specific Hamiltonian with intrinsic topological degeneracies\, such as the well-kno wn toric-code and surface-code models. The errors in this situation corres ponds to creation of anyons and are hence suppressed by energy penalty. In this way\, we can let nature itself do the quantum error correction. \nHow ever\, these exotic Hamiltonians usually involve multi-body interactions an d are hence hard to realize. Here\, I will mention some of my recent progre ss on solving this particular problem. I discuss how 4-body spin interacti ons can emerge in a 2D flat-band lattice with “Aharonov-Bohm cages”\, and i n the presence of light-matter interactions. Based on such an idea\, one c an realize the surface-code Hamiltonian in the ultra-strong coupling regime of a circuit-QED lattice\, when the interaction strength is comparable to the microwave photon frequency. Two types of 4-body stabilizer interaction s are realized by utilizing the electro-magnetic duality in circuit-QED. In such case\, the circuit-QED vacuum has topological degeneracies and can be used as a self-correcting quantum memory. An alternative approach withou t ultra-strong coupling is to simulate the surface-code Hamiltonian in the rotating frame\, with side-band driving through modulating the flux penetra ting SQUID couplers. Finally\, I will mention the problem of finite memory time at non-zero temperature and possible route to circumvent this problem . LAST-MODIFIED:20150918T123422Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141113T203000Z DTEND:20141113T213000Z DTSTAMP:20260828T094430Z UID:u1o4n9bj5v1ap48geahvd5mp84@google.com CREATED:20141112T190208Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/further?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdX AuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.u1o4n9bj5v1ap48geahvd5mp84&hs=121 LAST-MODIFIED:20141112T190208Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Further discussion of foundations of supersymmetry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150127T173000Z DTEND:20150127T183000Z DTSTAMP:20260828T094430Z UID:0otiutlj9fsfdg2ip63jsrv7vg@google.com CREATED:20150105T143313Z DESCRIPTION:Title : Statistical Mechanics of Money\, Income\, Debt & Energy Consumption\n\nSpeaker Name: Victor Yakovenko\n\nSpeaker Institution : Dep artment of Physics\, University of Maryland\n\nNotes: Event page: http://ww w.sesync.org/events-announcements/seminar-victor-yakovenko\n\nAbstract : Si milarly to the probability distribution of energy in physics\, the probabil ity distribution of money among the agents in a closed economic system is a lso expected to follow the exponential Boltzmann-Gibbs law\, as a consequen ce of entropy maximization. Analysis of empirical data shows that income di stributions in the USA\, European Union\, and other countries exhibit a wel l-defined two-class structure. The majority of the population (about 97%) b elongs to the lower class characterized by the exponential ("thermal") dist ribution. The upper class (about 3% of the population) is characterized by the Pareto power-law ("superthermal") distribution\, and its share of the t otal income expands and contracts dramatically during booms and busts in fi nancial markets. Globally\, data analysis of energy consumption per capita around the world shows decreasing inequality in the last 30 years and conve rgence toward the exponential probability distribution\, in agreement with the maximal entropy principle. Similar results are found for the global pro bability distribution of CO2 emissions per capita. Global inequality matter s for international effort to reach an agreement for addressing climate cha nge. This work was supported by a grant from the Institute for New Economic Thinking (INET). All papers are available at: http://physics.umd.edu/~yako venk/econophysics/\n\n\nJoin with Google Hangouts: https://hangouts.google. com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1 ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.0otiutlj9fsfdg2ip63jsrv7vg&hs=121 LAST-MODIFIED:20150106T142421Z LOCATION:SESYNC\, 1 Park Place Suite 300\, Annapolis MD SEQUENCE:3 STATUS:CONFIRMED SUMMARY:SESYNC Seminar by Victor Yakovenko TRANSP:OPAQUE BEGIN:VALARM ACTION:NONE TRIGGER;VALUE=DATE-TIME:19760401T005545Z X-WR-ALARMUID:FBFA6B3E-19B3-45A7-A0A1-4FF4DB4986E9 UID:FBFA6B3E-19B3-45A7-A0A1-4FF4DB4986E9 X-APPLE-DEFAULT-ALARM:TRUE END:VALARM END:VEVENT BEGIN:VEVENT DTSTART:20141124T200000Z DTEND:20141124T213000Z DTSTAMP:20260828T094430Z UID:hbuh86d71qkvn3ghukpc7difcc@google.com CREATED:20140806T144049Z DESCRIPTION:Title: Experimental Probes of Vacuum Energy\n\nSpeaker: Jay Hub isz\, Syracuse University\n\nAbstract: The vacuum energy changes when cosmo logical phase transitions take place\, or in environments with high tempera tures or chemical potentials. The propagation of primordial gravity waves is affected through the trace anomaly\, and eras where the vacuum energy do minates can lead to peaks in the gravity wave spectrum. The effect from th e electroweak phase transition is large and potentially observable with a d edicated experiment. I will also discuss the effect of high density phases of QCD in neutron stars\, where the vacuum is rearranged. The mass-radius relationships for neutron stars is sensitive to the equation of state\, of which one component is a vacuum energy. Depending on the nature of the va cuum energy\, the mass-radius relationship for such objects may differ by a n order one fraction. Such observations could potentially rule out large c lasses of explanations for the smallness of the currently observed vacuum e nergy.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_ /physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3Jv dXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.hbuh86d71qkvn3ghukpc7difcc&hs=121 LAST-MODIFIED:20141120T140508Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140326T180000Z DTEND:20140326T190000Z DTSTAMP:20260828T094430Z UID:js28r8lqs8ihcfru6jc45884io@google.com CREATED:20140321T180804Z DESCRIPTION:Speaker Name: Michael Sokoloff\n\nSpeaker Institution : Univers ity of Cincinnati\n\nTitle: "Particle-Antiparticle Oscillation and CP Viola tion in the Neutral Charm Meson System" LAST-MODIFIED:20140321T180804Z LOCATION:PSC Room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140408T171500Z DTEND:20140408T183000Z DTSTAMP:20260828T094430Z UID:2ovcere3or58co8ur3ogthfak8@google.com CREATED:20140331T144759Z DESCRIPTION:Speaker Name: Dr. Alex Sodt\n\nSpeaker Institution : National I nstitutes of Health\n\nTitle: Modeling Lipid Membrane Curvature Stress: Mo lecular Shape and Electrostatics\n\n LAST-MODIFIED:20140331T144759Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140423T200000Z DTEND:20140423T210000Z DTSTAMP:20260828T094430Z UID:vf60rll9hn27ntvhfu77nd6oq8@google.com CREATED:20140418T212814Z DESCRIPTION:Speaker Name: Dr. Robert Kaita\n\nSpeaker Institution : Princet on Plasma Physics Laboratory\n\nTitle : Addressing the First Wall Challenge for Magnetic Confinement Fusion in the National Spherical Torus-Upgrade\n\ n LAST-MODIFIED:20140418T212814Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120202T190000Z DTEND:20120202T203000Z DTSTAMP:20260828T094430Z UID:b0e78ljgkpk2ho5obv1upgj6u8@google.com CREATED:20120127T180432Z DESCRIPTION:Title : Mapping the TeV Sky with Cosmic Rays and Gamma Rays\n\n Speaker Name: Segev BenZvi\n\nSpeaker Institution : University of Wisconsin \n\nAbstract : The high-energy charged particles known as cosmic rays were first\ndiscovered 100 years ago\, but we have yet to confirm where and how they\nare created. It is believed that most of the cosmic rays at TeV\nene rgies are accelerated by supernova remnants in our galaxy\, but\nbecause th e cosmic rays are deflected by galactic magnetic fields\, we\ncannot trace their paths back to their sources.\nMagnetic "scrambling" of the cosmic ray s is expected to make their\narrival direction distribution at Earth almost completely isotropic.\nHowever\, during the past several years multiple ex periments have\nreported a significant anisotropy in the TeV cosmic rays ob served in the\nnorthern hemisphere. These surprising results are not curre ntly\nwell-understood.\nThe IceCube Neutrino Observatory\, which is deploye d at the South Pole\nand was completed in 2010\, is sensitive to TeV cosmic rays arriving from\nthe southern sky. The IceCube data show that the anis otropy observed in\nthe northern hemisphere is also present in the south on both large and\nsmall angular scales. The anisotropy also appears to have a strong\nenergy dependence. We will describe the IceCube results and dis cuss the\npossible origins of the anisotropy. We will also discuss future\ nmeasurements of TeV cosmic rays and gamma rays at the HAWC Gamma Ray\nObse rvatory\, currently under construction in Mexico.\n LAST-MODIFIED:20120127T180827Z LOCATION:PHYS 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T173000Z DTEND:20140327T180000Z DTSTAMP:20260828T094430Z UID:320oflias0rdfbe71eo5c19q3c@google.com CREATED:20140316T012405Z LAST-MODIFIED:20140316T013443Z LOCATION:Phys Room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150429T180000Z DTEND:20150429T190000Z DTSTAMP:20260828T094430Z UID:o47q980qf2un9hcngej4jfa8ek@google.com CLASS:PUBLIC CREATED:20150427T132657Z DESCRIPTION:Speaker: Keith Lee (University of Toronto)\n\nTitle: Quantum Co mputation and the Computational Complexity of Quantum Field Theory\n\nAbstr act: Quantum field theory provides the framework for the Standard Model of\ nparticle physics and plays a key role in physics. However\, calculations\n are generally computationally complex and limited to weak interaction\nstre ngths. I'll describe polynomial-time quantum algorithms for computing\nrela tivistic scattering amplitudes in both scalar and fermionic quantum\nfield theories. The algorithms achieve exponential speedup over known\nclassical methods. One of the motivations for this work comes from\ncomputational com plexity theory. Ultimately\, one wishes to know what is\nthe computational power of our universe. Studying such quantum algorithms\nprobes whether a u niversal quantum computer is powerful enough to\nrepresent quantum field th eory\; in other words\, is quantum field theory in\nBQP? Conversely\, one c an ask whether quantum field theory can represent a\nuniversal quantum comp uter\; is quantum field theory BQP-hard? We have\nshown that massive phi^4 theory can implement universal quantum\ncomputation and is thus BQP-complet e. LAST-MODIFIED:20150427T191533Z LOCATION:3100A CSS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150930T193000Z DTEND:20150930T203000Z DTSTAMP:20260828T094430Z UID:noo210jalak99og16ih4uuo3d8@google.com CREATED:20150925T192841Z DESCRIPTION:Title : A High Pressure Route to Energy Frontier Research: Quan tum Computational Prediction and Experimental Synthesis\nSpeaker Name: Dr. DuckYoung Kim\nSpeaker Institution : Geophysical Laboratory\, Carnegie Inst itution of Washington\nAbstract : A major challenge of our time is to devel op new pathways for energy transformation\, storage\, and use. This 'energy frontier research'\, aiming at design\, synthesis\, and manufacture with h igher performance and functionality\, requires scientific innovative observ ations far beyond incremental advances in current energy technologies. Trad itionally\, basic science has relied on two variables or dimensions (namely temperature and composition) of known materials to understand underlying p hysics. Pressure is regarded as an entirely new dimension of science\, whic h enables us to explore much broader range of thermo-mechanical conditions by accessing extreme states of matter.\nIn this presentation\, I will show recent progress on our theory-experiment collaborations in this direction. Crystal structure searching using density functional theory enables us to p redict novel materials and guides our experiments. I will present our recen t successful examples to highlight the importance of integrated experiment- theory collaboration for Energy Frontier Research. Especially\, I will focu s on our recent discovery of a new silicon allotrope with an orthorhombic s tructure under pressure\, which is also stabilized at ambient conditions. I t possesses a quasi-direct band-gap with ~1.3 eV\, which is the optimal ban d-gap for photovoltaic applications. LAST-MODIFIED:20150925T192841Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140508T180000Z DTEND:20140508T193000Z DTSTAMP:20260828T094430Z UID:ohgcckm5ksihrr025hovubl33s@google.com CREATED:20140406T025600Z DESCRIPTION:Speaker Name: Dmitry Abanin\n\nSpeaker Institution: Perimeter Institute\n\nTitle: Ergodicity\, entanglement\, and many-body localization: a fresh look\n\nAbstract: We are used to describing systems of many partic les by statistical mechanics. However\, the basic postulate of statistical mechanics – ergodicity -- breaks down in so-called many-body localized syst ems\, where disorder prevents particle transport and thermalization. In thi s talk\, I will present a theory of the many-body localized (MBL) phase\, b ased on new insights from quantum entanglement. I will argue that\, in cont rast to ergodic systems\, MBL eigenstates are not highly entangled. I will use this fact to show that MBL phase is characterized by an infinite number of emergent local conservation laws\, in terms of which the Hamiltonian ac quires a universal form. Turning to the experimental implications\, I will describe the response of MBL systems to quenches: surprisingly\, entangleme nt shows logarithmic in time growth\, reminiscent of glasses\, while local observables exhibit power-law approach to “equilibrium” values. I will supp ort the presented theory with results of numerical experiments. I will clos e by discussing experimental implications and other directions in exploring ergodicty and its breaking in quantum many-body systems.\n\n\n\nHost: Vla dimir Manucharyan LAST-MODIFIED:20140501T194323Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160303T190000Z DTEND:20160303T200000Z DTSTAMP:20260828T094430Z UID:10b49vd1cfk1b3bs28dgapme1g@google.com CREATED:20160226T163958Z LAST-MODIFIED:20160226T163958Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:THERE WILL BE NO CNAM COLLOQUIUM TODAY TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150424T150000Z DTEND:20150424T160000Z DTSTAMP:20260828T094430Z UID:1a2chagengdp4b01tnomv92ges@google.com CREATED:20150415T155229Z DESCRIPTION:Speaker: Leo Kouwenhoven (TU Delft)\n\nTitle: Experimental prog ress on Majoranas in semiconductors\n\nAbstract: Majoranas in semiconductor nanowires can be probed via various electrical measurements. Tunnel spectr oscopy reveals zero-bias peaks in the differential conductance. These zero- bias peaks have a particular dependence on magnetic field (amplitude and di rection) and electron density. This dependence allows us to falsify many al ternative theories for the observations. New challenges include a direct de monstration of topological protection\, which is provided by a parity prote ction: How stable is the system's occupation in terms of an even or an odd number of quasi-particles? We demonstrate that the quasi-particle parity in a superconducting Cooperpair box can be stable over timescales of minutes. To demonstrate this protection for Majoranas it is crucial that the induce d superconducting gap has negligible sub-gap states. To obtain such hard ga ps under Majorana conditions currently forms the most important challenge. We report on progress in optimizing materials and measurement techniques.\n \nHost: Jay Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150415T155229Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151105T160000Z DTEND:20151105T173000Z DTSTAMP:20260828T094430Z UID:fp6gd4ijgb92pecgrmckvsgg7s@google.com CREATED:20150918T214005Z DESCRIPTION:Speaker Name: Rahul Nandkishore \n\nSpeaker Institution: Unive rsity of Colorado\, Boulder\n\nTitle: Many Body Localization Beyond Exact E igenstates and Closed Systems\n\nAbstract: The discovery of many body local ization (MBL) has opened a new chapter in the study of quantum statistical mechanics. Many body localized systems do not reach thermal equilibrium eve n at infinite times\, and can display counterintuitive properties such as s pontaneously broken symmetries at high temperature in one dimension\, and t opological order without a bulk gap (Phys. Rev. B 88\, 014206 (2013). Howev er\, most investigations of MBL have focused on the (experimentally unreali zable) limit of perfectly isolated quantum systems\, and on experimentally unmeasurable quantities such as many body level statistics or properties of exact eigenstates. \n\nIn this talk\, I demonstrate how MBL may be underst ood using experimentally measurable quantities - the spectral functions of local operators - and how the discussion may be extended to imperfectly iso lated systems. I discuss the properties of a (many body) localized system c oupled to a (delocalized) heat bath\, and discuss the behavior that may ari se. \n\nRefs: Phys. Rev. B 90\, 064203 (2014)\, Phys. Rev. Lett. 114\, 1174 01 (2015)\, Phys. Rev. B 90\, 195115 (2014)\, arXiv: 1506.05468\n\nHost: Je d Pixley\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151030T185712Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150327T160000Z DTEND:20150327T170000Z DTSTAMP:20260828T094430Z UID:huo59hpki4p45ioc0htralee4g@google.com CLASS:PUBLIC CREATED:20150319T184052Z DESCRIPTION:Speaker Name: Xunnong Xu\n\nSpeaker Institution: JQI\n\nTitle: Quantum nonlinear optics near optomechanical instabilities. \n \nAbstrac t: Optomechanical systems provide a unique platform for observing quantum behavior of macroscopic objects. However\, efforts toward realizing nonline ar behavior at the single-photon level have been inhibited by the small siz e of the radiation pressure interaction. Here we show that it is not necess ary to reach the single-photon strong-coupling regime in order to realize s ignificant optomechanical nonlinearities. Instead\, nonlinearities at the f ew quanta level can be achieved\, even with weak coupling\, in a two-mode o ptomechanical system driven near instability. In this limit\, we establish a new figure of merit for realizing strong nonlinearity which scales with t he single-photon optomechanical coupling and the sideband resolution of the mechanical mode with respect to the cavity linewidth. We find that current devices based on optomechanical crystals\, thought to be in the weak-coupl ing regime\, may be able to achieve strong quantum nonlinearity\, enabling deterministic interactions between single photons.\n\n*Free lunch served ri ght before the talk\n LAST-MODIFIED:20150320T180805Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160215T210000Z DTEND:20160215T220000Z DTSTAMP:20260828T094430Z UID:8r1beo1qc1mjgds9rb8quo3jk0@google.com CREATED:20160128T170056Z DESCRIPTION:Speaker Name: Gregory Voth\n\nSpeaker Institution : University of Chicago\n\nTitle: Theory and Simulation of Biomolecular Systems: The Mu ltiscale Challenge \n\nAbstract : A multiscale theoretical and computationa l methodology will be discussed for studying biomolecular systems across mu ltiple length and time scales. The approach provides a systematic connectio n between all-atom molecular dynamics\, coarse-grained modeling\, and mesos copic phenomena. At the heart of the approach is a method for deriving coar se-grained models from protein structures and their underlying molecular-sc ale interactions. This particular aspect of the work has strong connections to the theory of renormalization\, but it is more broadly developed and im plemented for heterogeneous biomolecular systems. A critical component of t he methodology is also its connection to experimental structural data such as cryo-EM or x-ray\, thus making it “hybrid” in its character. Application s of our multiscale simulation approach to elaborate key features of comple x processes such as the HIV virus capsid assembly and protein-mediated memb rane remodeling will be presented as ! time allows. \n\n\n\n LAST-MODIFIED:20160208T183233Z LOCATION:Marker Seminar room 0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141112T160000Z DTEND:20141112T210000Z DTSTAMP:20260828T094430Z UID:46s7b60v0na47vi1gbvrbl1rbo@google.com CREATED:20141020T213702Z DESCRIPTION:Talk schedule:\n\n11:00 AM Sriram Ganeshan\, Quantizing quantu m theory with constraints on a set of conjugate variables: A natural formal ism for para-fermions\n\n11:45 AM Xin Liu\, Universal spin-triplet superco nducting correlation of Majorana Fermions\n\n1:30 PM Diego Rainis\, How re al is the Majorana? - Critical discussion of the currently available experi mental evidence\n\n2:15 PM David Clarke\, Artificial anyons in Hybrid Supe rconductor/Quantum Hall devices\n\n3:00 PM Dong Liu\, Probing Majorana Phy sics in Quantum Dot Shot Noise Experiments\n\n\nThe entire talk schedule ca n be found at http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20141020T213702Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 3 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140224T210000Z DTEND:20140224T220000Z DTSTAMP:20260828T094430Z UID:qajqvg4f36ui88eg76ahq7i46c@google.com CREATED:20140217T190627Z DESCRIPTION:Speaker Name: Bogdan Dragnea\n\nSpeaker Institution : Indiana U niversity\n\nTitle : Mechanically-constrained virus shells\n\nAbstract : Ce rtain viruses spontaneously assemble from hundreds to thousands of subunits with stoichiometric precision. Viruses also can undergo large mechanical d eformations after which they spontaneously reconstitute to the initial morp hology and function. Both properties\, stoichiometry and reconstitution\, r emain very difficult to emulate in synthetic materials. I will discuss atte mpts at shedding light on the physical principles behind these properties b y studying assembly and deformation in presence of mechanical constraints f or two systems: the immature Human Immunodeficiency virus and the Brome mos aic virus.\n LAST-MODIFIED:20140217T190627Z LOCATION:0112 Chemistry Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160322T171500Z DTEND:20160322T183000Z DTSTAMP:20260828T094430Z UID:kvmjn8u1eq59ah5krcp9d1iuhc@google.com CREATED:20160321T140200Z DESCRIPTION:Speaker Name: Ling Miao\n\nSpeaker Institution: Physical Review X\n\nAbstract : PRX\, launched in May\, 2011\, is still a new member of th e Physical Review family journals (including PRL\, PRA\, PRB\, PRC\, PRD\, and PRE) -- the bedrock journals that the international physics community r elies on. What are PRX's current status and position? What are its long-ter m mission and goals? What can it offer you?\n\nI will answer these question s in this talk. In connection I will briefly discuss the status of the Phys ical Review family journals and their indisputable contribution to physics and to the international physics community. I will provide some representat ive statistics on publications\, citations and impact measures as well as s ome geographic and institutional comparisons.\n\nI will also give you an in sider's view of the PRX's editorial process: On what basis do the editors e valuate new papers\, choose referees\, and accept and reject papers? What a re the fundamental challenges the editors face in publishing a highly selec tive journal? How c! an authors navigate the review process productively? H ow can referees help?\n\nLast but not least\, I want to get your view of th e Physical Review journals and your feedback on our editorial work. Such in put will help PRX and its sister journals become stronger and work better for you. \n\n LAST-MODIFIED:20160321T145844Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140204T181500Z DTEND:20140204T193000Z DTSTAMP:20260828T094430Z UID:ll4p4t7gdvga0biaea6iq68upk@google.com CREATED:20140127T160109Z DESCRIPTION:Title : Quantum Advantage in the Thermodynamic Efficiency of Fe edback Control.\n\nSpeaker Name: Dr. Jordan Horowitz\n\nSpeaker Institution : University of Massachusetts\, Boston\n LAST-MODIFIED:20140203T150657Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140508T173000Z DTEND:20140508T180000Z DTSTAMP:20260828T094430Z UID:gb35d806b8o5b0ei63iuc489a4@google.com CREATED:20140406T025344Z LAST-MODIFIED:20140406T025353Z LOCATION:Phys room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140416T173000Z DTEND:20140416T190000Z DTSTAMP:20260828T094430Z UID:21moq6hp9519p9eps2qtchtbps@google.com CREATED:20140129T211240Z DESCRIPTION:Title: Quasinormal Modes Beyond Kerr: Turbulent Instability and More\n\nSpeaker: Aaron Zimmerman\, CITA\n\nAbstract: Recent simulations of perturbed of AdS black holes have revealed nonlinear\, turbulent behavior in purely gravitational systems. This encourages a search for turbulence in other gravitational systems\, especially realistic black holes. I will rep ort on a new method for computing the quasinormal mode frequencies around b lack holes slightly deformed from Kerr\, which allows for a first accountin g of nonlinear mode-mode coupling. We find that scalar fields around pertur bed\, rapidly rotating black holes suffer from a parametric instability\, a nalogous to the onset of turbulence in fluids. I will discuss other applica tions of our method\, specifically to the quasinormal modes of weakly charg ed\, rotating black holes\, and future directions for this work. LAST-MODIFIED:20140409T155513Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141107T160000Z DTEND:20141107T220000Z DTSTAMP:20260828T094430Z UID:6s94tafuoqf69ntnqoq84g43d0@google.com CREATED:20141020T213647Z DESCRIPTION:Talk schedule:\n\n11:00 AM William Cole\, Magnetism and superf luidity of spin-orbit coupled bosons in one dimension\n\n11:45 AM Xiaopeng Li\, Chiral spin superfluidity and spontaneous spin Hall effect in optical lattices\n\n1:30 PM Stefan Natu\, What can we learn from far from equilib rium dynamics in interacting Bose gases?\n\n2:15 PM Juraj Radic\, Stoner f erromagnetism in a thermal pseudospin-1/2 Bose gas\n\n3:00 PM Setiawan\, T opological Phase Transition in Spin Orbit-Coupled Ultracold Fermi Gas\n\nTh e entire talk schedule can be found at http://www.physics.umd.edu/cmtc/semi nars.html\n LAST-MODIFIED:20141020T213647Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140410T180000Z DTEND:20140410T193000Z DTSTAMP:20260828T094430Z UID:hkt95hj41o1mss8ti62trck72s@google.com CREATED:20140403T190611Z DESCRIPTION:Speaker: Kathryn Krycka\, NIST\n\nTitle: Putting a New Spin o n the Surface Canting of Ferrite Nanoparticles\n\nAbstract: Magnetic nanos cale structures are intriguing\, in part\, because of the exotic properties that can emerge compared with bulk materials. For example the reduction of magnetism in ferrites (Fe3O4 and CoFe2O4) with decreasing nanoparticle siz e has been hypothesized to originate from crystalline truncation at the sur face\, surface dislocations\, anisotropy-induced radial orientation of the spins\, and size-induced thermal fluctuations\, which are difficult to dist inguish using conventional magnetometry. Small-angle neutron scattering (S ANS) with polarization analysis of the scattered neutron spin allows the ch emical and magnetic morphologies of the nanoparticles are their interaction s to be probed with vector sensitivity to the magnetism. Application to clo se-packed\, 9 nm Fe3O4 nanoparticles reveal that at nominal saturation of 1 .2 Tesla the missing magnetic moments unexpectedly form ordered shells 1.0 to 1.5 nm thick that are canted between 23 and 42 degrees with respect to t he applied field at 160 to 320 K. Conversely\, 11 nm CoFe2O4 nanoparticles of higher magnetocrystalline anisotropy display an average canting of abou t 25 degrees that is not limited to the surface\, but is uniformly distribu ted throughout each nanoparticle. Both nanoparticle systems show a uniform magnetization within each nanoparticle of semi-random alignment when the ap plied field is removed.\n\nThis work has been carried out in collaboration with Ryan Booth\, Julie Borchers\, Wangchun Chen\, Yumi Ijiri\, Kathryn Has z\, Sara Majetich\, Sam Oberdick\, James Rhyne\, and Shannon Watson.\n\n\nH ost: Nick Butch & Johnpierre Paglione LAST-MODIFIED:20140403T190611Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151209T160000Z DTEND:20151209T170000Z DTSTAMP:20260828T094430Z UID:ju6quihoscqb9m1m1cbqg79818@google.com CLASS:PUBLIC CREATED:20151203T124709Z DESCRIPTION:Liang Jiang (Yale)\n\nQuantum Control & Quantum Error Correctio n with Superconducting Circuits\n\nWe have developed an efficient quantum c ontrol scheme that allows for arbitrary operations on a cavity mode using s trongly dispersive qubit-cavity interaction and time-dependent drives [1\,2 ]. In addition\, we have discovered a new class of bosonic quantum error co rrecting codes\, which can correct both cavity loss and dephasing errors. O ur control scheme can readily be implemented using circuit QED systems\, an d extended for quantum error correction to protect information encoded in b osonic codes. Moreover\, engineered dissipation can also implement holonomi c quantum computation using superconducting circuits [3].\n[1] Krastanov\, et al.\, PRA 92\, 040303 (2015)\n[2] Heeres\, et al.\, PRL 115\, 137002 (20 15)\n[3] Albert\, et al.\, arXiv: 1503.00194 LAST-MODIFIED:20151208T120536Z LOCATION:3100 Computer and Space Sciences Building\, College Park\, MD 2074 2 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160405T171500Z DTEND:20160405T181500Z DTSTAMP:20260828T094430Z UID:b5ffbb7b9efp8t3mhp06o892ao@google.com CREATED:20160331T154849Z DESCRIPTION:Speaker Name: Raam Uzdin\n\nSpeaker Institution: The Hebrew Uni versity\, Israel\n\nTitle: Local versions of the second law for small and q uantum system with applications to heat machines\n\nAbstract:Abstract:\nThe second law involves changes in the first order moment of the energy\, i.e. work and heat. These are associated with an information measure - the entr opy. Are there additional second laws that deal with higher energy moments ? What are the information measure associated with expectation values such as the energy variance? After reviewing the structure and properties of t he standard second law (e.g. the existence of periodic form and a global fo rm)\, we'll introduce a formalism that can be used to generate new types of second laws (in particular\, involving higher order energy moments). By co nstruction\, these laws have the same form and structure as the standard se cond law. This is very different from recent results obtained in thermodyna mic resource theory. There\, a family of non-decreasing quantities are deri ved\, but theses extra "second laws" are not associated with a change in ob servables (something analogous to heat). \n\n\n LAST-MODIFIED:20160404T194612Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150917T163000Z DTEND:20150917T173000Z DTSTAMP:20260828T094430Z UID:s9k5gnu4ahhoaku49941aa5oa4@google.com CREATED:20150910T124453Z DESCRIPTION:Title: What's a label? Language matrices and their interactions \nSpeaker: Juan Uriagereka\, Dept. of Linguistics\, UMD\nDate/Time: Thursda y\, Sept 17\, 12:30\n LAST-MODIFIED:20150910T192933Z LOCATION:IREAP Conference Room (ERB 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:APPLIED DYNAMICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T180000Z DTEND:20140327T193000Z DTSTAMP:20260828T094430Z UID:0t1khf9kgk53ckvrph7g7r77t0@google.com CREATED:20140316T012824Z DESCRIPTION:Speaker Name: Angela Kou\n\nSpeaker Institution: Department o f Applied Physics Yale University\n\nTitle: Fractional Quantum Hall Effect in Bilayer Graphene\n\nAbstract: The nature of fractional quantum Hall (FQ H) states is determined by the interplay between the Coulomb interaction an d the symmetries of the system. The unique combination of spin\, valley\, a nd orbital degeneracies in bilayer graphene is predicted to produce novel a nd tunable FQH ground states. Here we present local electronic compressibil ity measurements of the FQH eect in the lowest Landau level of bilayer grap hene. We observe a sequence of incompressible FQH states that breaks partic le-hole symmetry and instead obeys a v ---> v+2 symmetry\, which highlights the importance of the orbital degeneracy for many-body states in bi-layer graphene [1].\n\n[1] A. Kou\, B. E. Feldman\, A. J. Levin\, B. I. Halperin\ , K. Watanabe\, T. Taniguchi\, A. Ya-\ncoby\, arxiv:1312.7033\n\n\nHOST: V ladimir Manucharyan LAST-MODIFIED:20140321T174646Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140505T203000Z DTEND:20140505T213000Z DTSTAMP:20260828T094430Z UID:67mcnlleasediakf17qnr4hcao@google.com CREATED:20140305T170132Z DESCRIPTION:Speaker Name: Donald V. Reames\n\nSpeaker Institution : IPST Un iversity of Maryland\n\nTitle : Element Abundances in Solar Energetic Parti cles: Two Physical Processes\, Two Abundance Patterns\n\nAbstract: Abundan ces of elements in solar energetic particles (SEPs) come in two flavors\, h istorically called “impulsive” and “gradual” events\, now observed for near ly 20 years by the Wind spacecraft. Gradual SEP events are produced when s hock waves\, driven by coronal mass ejections (CMEs)\, accelerate the ambie nt coronal plasma yielding ions of 1–10 MeV/amu where measured average abun dances of 21 elements differ from the solar photospheric abundances by a we ll-known dependence on the first ionization potential (FIP) of the element. The abundances of heavier elements\, near Fe\, are fractionated by differ ential scattering during transport\, through intense proton-generated Alfvé n waves\, that varies with the mass-to-charge ratio A/Q of the ion. This p rocess makes Fe/O\, for example\, vary in space and time\, but averaging ov er the spatial distribution using many SEP events can recover the FIP depen dence of the coronal abundances.\nThe smaller impulsive (or “3He-rich”) SEP events are associated with magnetic reconnection involving open field line s in solar flares or jets that also eject plasma to produce CMEs recently f ound associated with at least ~70% of these SEP events. These events produ ce striking heavy-element abundance enhancements relative to coronal abunda nces\, with a strong\, power-law dependence on A/Q with a ~3.6 power\, on a verage\, with Q values determined at coronal temperatures of 2.5–3.2 MK. T his produces average enhancements by a factor of 3 at Ne\, 9 at Fe\, and 90 0 for elements with 76≤Z≤82. Small SEP events with the steepest enhancemen ts (~6 power) from ~2.5 MK plasma\, are associated with B- and C-class X-ra y flares\, and with narrow CMEs. In contrast\, larger events have flatter spectra\, more modest enhancements (~3 power)\, tend to come from ~3.2 MK p lasma and to associate with M- and even X-class flares. The 1000-fold enha ncements of heavy elements in some events are uncorrelated with the 1000-fo ld enhancements in 3He/4He in others\, suggesting that two different accele ration mechanisms contribute to each event.\n LAST-MODIFIED:20140428T174127Z LOCATION:Computer & Space Science Building\, Room 1113 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140213T190000Z DTEND:20140213T203000Z DTSTAMP:20260828T094430Z UID:ok146dq105a3in8cajjht6ojbk@google.com CREATED:20140205T020341Z LAST-MODIFIED:20140212T210203Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium -- moved to 4/3/14 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141023T163000Z DTEND:20141023T173000Z DTSTAMP:20260828T094430Z UID:rlfc0pgs7c7sei0i4e5i12afjo@google.com CREATED:20140911T182631Z DESCRIPTION:Speaker Name: Korana Burke\n\nSpeaker Institution: UC-Davis\n\n Title: The Role of Geometric Structures in Chaotic Phase Space -- Ionizatio n and Chaos Induced Energy Hopping from Mathematical Perspective\n\nAbstrac t : Humans interact with chaotic systems on everyday basis. Chaos plays a f undamental role on a wide span of length and time scales. Since it is hard to isolate a chaotic system from random interactions with the environment\, the challenges in studying its behavior are both mathematical and experime ntal. In recent years\, atomic gasses have emerged as experimentally access ible systems for observing chaos under controlled conditions. In this talk I will present the study of geometric structures in phase space that govern the chaotic transport in an atomic system. I will show how these results a pply to understanding the chaotic ionization in Rydberg atoms. Theoretical results are based on the study of a homoclinic tangle and its corresponding turnstile. Understanding the relationship between the turnstile and the sy stem parameters allows us to draw conclusions about the ionization process and to design the experiments for probing the structure of the chaotic phas e space. Finally\, I will present a set of recent results which show that t his approach can be used to design an experimental protocol for nonadiabati c energy change of an electron ensemble.\n\n\n\n\n\nJoin with Google Hangou ts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJr NjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.rlfc0pgs 7c7sei0i4e5i12afjo&hs=121 LAST-MODIFIED:20141021T185603Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160321T200000Z DTEND:20160321T210000Z DTSTAMP:20260828T094430Z UID:dmi13po6ek0ghttvtjfk8o709g@google.com CREATED:20160316T134211Z DESCRIPTION:Speaker Name: Dr. Alessandra Buonanno\n\nSpeaker Institution : MPI for Gravitational Physics & University of Maryland\n\nTitle : "GW150914 : The Birth of Gravitational-Wave Astronomy"\n\nAbstract : The recent obse rvation of gravitational waves from a binary black-hole merger by LIGO mark s the beginning of a new era in physics and astrophysics. I will review the theoretical work that paved the way to observe such a signal and discuss t he results of the discovery focusing on its gravitational\, astrophysical a nd fundamental physics aspects. LAST-MODIFIED:20160316T134401Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140410T150000Z DTEND:20140410T160000Z DTSTAMP:20260828T094430Z UID:1r89jnlofdtc08t6ft5jonn2l4@google.com CREATED:20140403T162043Z DESCRIPTION:“Using a Single NIR Comb for High Sensitivity & Resolution in t he FIR”\n\nIn both the biological sciences and remote sensing\, there is a great need for high sensitivity\, high resolution optical detection tools i n the far infrared (FIR). Unfortunately\, directly using FIR sources is pro blematic for several reasons. (1) Robust\, tunable\, narrow line width sour ces in the FIR are difficult to build\; (2) biological materials tend to ab sorb in the FIR. Thus\, the FIR source could damage or alter the sample\, a nd the signature absorption of the target of interest could be masked by th e bulk absorption properties of the sample material that contains the targe t. Some solutions exist: one can use CARS (coherent anti-Raman scattering) or its related processes. Here\, the source light is in the near infrared ( NIR)\, the signal is in the visible (or near visible) but the target transi tions are in the FIR. Furthermore\, the output signal is highly directional which helps in signal collection. But CARS does suffer from a few difficul ties. First\, being a non-linear process\, one must use intense lasers\; ty pically these are short-pulse devices in order to boost peak intensities. B ut the shorter the pulse length\, the broader the laser band width\, which reduces the spectral resolution. Second\, the CARS beams must overlap in bo th time and space. But the shorter the pulse width\, and/or the more tightl y focused the beams\, the more difficult this is\, making for a system that is not usually robust enough for field work. In this talk we propose a nov el technique that we call Comb-CARS. In this methodology\, we combine the p henomenal spectral resolution of a frequency comb with the convenient wavel engths of CARS. Furthermore\, by using a single comb\, the beams are automa tically aligned\, both in time and space. We will discuss the comb-CARS con cept and speculate on the feasibility of this interesting tool.\n---------- -------\nProf. DePaola is well-known as a pioneer of a technique known as M OTRIMS (magneto-optical trap\, recoil ion spectroscopy). He is a member of the American Physical Society’s “Fellow Selection Committee.” Additionally\ , he is a Department of State Jefferson Science Fellow\, a Pro tem member o f the National Academy of Science\, and a Fellow of the American Physical S ociety. LAST-MODIFIED:20140403T163029Z LOCATION:Jeong H. Kim Engineering Building\, Kay 1 Boardroom (Room 1107) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Brett D. DePaola: Comb-CARS Special Seminar in Bioengineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160208T160000Z DTEND:20160208T170000Z DTSTAMP:20260828T094430Z UID:hksvsvjk9j2jgu0a91enk6pvm8@google.com CREATED:20160203T160027Z DESCRIPTION:Speaker Name: Miguel Morales\n\nSpeaker Institution : Lawrence Livermore National Laborato\n\nTitle: Materials at Extreme Conditions: Fro m Ignition to Planetary Interiors\n\nAbstract: TBA LAST-MODIFIED:20160203T160151Z LOCATION:Marker Seminar room 0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160226T171500Z DTEND:20160226T181500Z DTSTAMP:20260828T094430Z UID:4pkvnvbvjfkgf563mller5d2mc@google.com CREATED:20160218T170540Z DESCRIPTION:Speaker: Dr. Oleksandr Kyriienko\n\nInstitution: Niels Bohr Ins titute\, Copenhagen\, Denmark\n\nFree lunch served at 12:00\n\nTitle: Conti nuous wave single photon transistor based on a superconducting circuit\n\nA bstract: The development of an efficient single microwave photon detector r epresents the open challenge of circuit QED and typically relies on the tim e-variation of the control field. Searching for the simple ready-to-go setu p\, we propose a microwave frequency single photon transistor device which can operate under continuous wave probing. It can be realized using an impe dance-matched system of a three level artificial atom coupled to two microw ave cavities both connected to input/output waveguides. Using an additional classical drive for the upper transition\, we find the parameter space whe re a single photon control pulse can be fully absorbed by hybridized excite d states. This subsequently leads to series of quantum jumps in the upper m anifold and appearance of a photon flux leaving the second cavity through a separate input/output port. The resulting device is robust to dephasing pr ocesses and possesses low dark count rate.\n LAST-MODIFIED:20160222T175924Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141020T190000Z DTEND:20141020T203000Z DTSTAMP:20260828T094430Z UID:recmaqt51q39phvi1jcjp4akjo@google.com CREATED:20140825T200521Z DESCRIPTION:Title: The Matrix: Reloaded\, Reweighted\, and Ranked\n\nSpeake r: Jamie Gainer\, University of Florida\n\nAbstract: The Matrix Element Met hod (MEM) is a powerful tool\; it has recently been useful in the four-lept on channel\, first for Higgs discovery and now for Higgs coupling measureme nts. Challenges remain for the wide implementation of the MEM in searches for BSM physics. I describe a procedure for expediting BSM searches using reweighting techniques\, as well as an innovative use of the MEM in situati ons where the signal hypothesis is unknown.\n\nJoin with Google Hangouts: h ttps://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJ rNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.recmaqt 51q39phvi1jcjp4akjo&hs=121 LAST-MODIFIED:20141010T192715Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160225T210000Z DTEND:20160225T223000Z DTSTAMP:20260828T094430Z UID:r2shg4melvl5npicee19g473s0@google.com CREATED:20160205T141149Z DESCRIPTION:Speaker: Brian Swingle\n\nSpeaker Institution: Stanford Univers ity\n\nTitle: Measuring Quantum Information Scrambling\n \nAbstract: This t alk is concerned with two ideas: that black holes can be viewed as highly e ntangled quantum information processing devices and that there exist fundam ental bounds on the dynamics of quantum field theories. These two ideas are connected by holographic duality which relates quantum gravity and quantum field theory. I will first review how ideas of quantum entanglement\, quan tum information scrambling\, and computational complexity have contributed to our understanding of black holes. Then I will argue that a natural next step is to begin testing these ideas in the lab using recent advances in th e coherent manipulation of quantum many-body systems. Focusing on informati on scrambling\, I will present an experimental proposal\, feasible with exi sting technology\, to measure so-called out-of-time-order correlations whic h probe information scrambling. I will then discuss broadly what we can lea rn about quantum field theory and quantum gravity using such measurements. The work described in this talk brings together elements of quantum entangl ement\, quantum field theory\, string theory\, quantum information\, and bl ack holes. LAST-MODIFIED:20160205T141149Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150219T203000Z DTEND:20150219T213000Z DTSTAMP:20260828T094430Z UID:fkdqacnmpoakoe24v5ejdgracg@google.com CREATED:20150213T162238Z DESCRIPTION:Speaker: Matt Calkins\nAbstract: Further discussion of Lott's p aper "The Geometry of Supergravity Torsion Constraints"\, arXiv:math/01081 25\, focusing on specific examples: U(n) structures and supergravity in 3D. LAST-MODIFIED:20150213T162238Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lott's paper on torsion constraints\, part 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150929T171500Z DTEND:20150929T183000Z DTSTAMP:20260828T094430Z UID:vtu04uli51bo0s3pleq7pmeek8@google.com CREATED:20150923T131901Z DESCRIPTION:Title : STATISTICAL PHYSICS in the OEUVRE of Chen Ning YANG\nSp eaker Name: Professor Michael Fisher\nSpeaker Institution : UMCP\nAbstract : Starting from his earliest years selected contributions of C.N. Yang to s tatistical mechanics will be high-lighted and some of the physics to which they have led will be briefly developed -- including the basis of a recentl y submitted Letter about soluble models that allow local volume fluctuation s and so overcome a serious defect of the Landau and Field Theory approache s to fluid criticality. LAST-MODIFIED:20150923T131901Z LOCATION:Room 1116\, IPST Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150317T180000Z DTEND:20150317T190000Z DTSTAMP:20260828T094430Z UID:2oqlgdh1udgm6rf9lvaa3rauks@google.com CLASS:PUBLIC CREATED:20150312T141455Z DESCRIPTION:Speaker Name: Andrei Khrennikov\n\nSpeaker Institution: Linnae us University\n\nTitle: The CHSH inequality: Quantum probabilities as class ical conditional probabilities\n\nAbstract: The celebrated theorem of A. Fi ne implies that the CHSH inequality is violated if and only if the joint pr obability distribution for the quadruples of observables involved in the EP R-Bohm-Bell experiment does not exist\, i.e.\, it is impossible to use the classical probabilistic model (Kolmogorov\, 1933). In this talk we demonstr ate that\, in spite of Fine's theorem\, the results of observations in the EPR-Bohm-Bell experiment can be described in the classical probabilistic fr amework. However\, the "quantum probabilities" have to be interpreted as co nditional probabilities\, where conditioning is with respect to fixed exper imental settings. Our approach is based on the complete account of randomne ss involved in the experiment. The crucial point is that randomness of sele ctions of experimental settings has to be taken into account. This approach can be applied to any complex experiment in which statistical data are col lected for various (in general incompatible) experimental settings. LAST-MODIFIED:20150312T142851Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141118T190000Z DTEND:20141118T200000Z DTSTAMP:20260828T094430Z UID:6jf7omjpunrihcd5qv7jost444@google.com CREATED:20141112T193516Z DESCRIPTION:Speaker Name: Eliot Kapit\n\nSpeaker Institution: Oxford Univer sity\n\nTitle: Self-correcting Quantum Code\n\nAbstract: A physical realiz ation of self-correcting quantum code would be profoundly useful for constr ucting a quantum computer. In this theoretical talk\, I will review and pro vide partial solutions to the major challenges preventing self-correcting q uantum code from being engineered in realistic devices. I consider a varian t of Kitaev's toric code coupled to propagating bosons\, which induce a lon g-ranged interaction between anyonic defects. By coupling the primary quant um system to an engineered dissipation source through resonant energy trans fer\, I demonstrate a "rate barrier" which leads to a potentially enormous increase in the system's quantum state lifetime through purely passive quan tum error correction\, even when coupled to an infinite temperature bath. W hile the mechanism is not scalable to infinitely large systems\, the maximu m effective size can be very large\, and it is fully compatible with active error correction schemes. The model uses only on-site and nearest-neighbor interactions\, and could be implemented in superconducting qubits.\n\n\nJo in with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd .edu/joint-quantum?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW 5kYXIuZ29vZ2xlLmNvbQ.6jf7omjpunrihcd5qv7jost444&hs=121 LAST-MODIFIED:20141112T193838Z LOCATION:CSS 2115 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160204T173000Z DTEND:20160204T183000Z DTSTAMP:20260828T094430Z UID:9khujd8ib703h9nv61bs53kdmo@google.com CREATED:20160202T205033Z DESCRIPTION:Speaker Name: Dr. Antonio Ting\n\nSpeaker Institution : Naval R esearch Laboratory \n\nTitle : Laser Acceleration of Ions in Gaseous Plasma at Near Critical Densities\n\nAbstract : Monoenergetic ion beams can be pr oduced by the interaction of an intense laser pulse with a near-critical pl asma target. For solid state laser wavelengths near 1 μm\, critical densiti es can be readily achieved using solid targets and many successes have been reported. However\, the inconvenience of replacing the solid target after each laser shot made it less desirable for many applications. Using gaseous targets with auxiliary hydrodynamic shocks to increase the plasma density to near critical values and to shape the density profile becomes attractive . This configuration also has additional advantages of repeatability and co ntinual usability of gaseous targets\, proper shaping of the rising and fal ling density gradients of the plasma region\, and the exploration of novel mechanisms such as proton acceleration by magnetic induction fields. For lo nger wavelength lasers such as terawatt CO2 lasers\, the lower critical den sities make gas targets even more appropriate! and the hydrodynamic shocks could be used to primarily shape the plasma density profile. \nUsing the 10 TW TFL laser system at the Naval Research Laboratory (NRL)\, laser ion acce leration has been demonstrated from a a indicates a good agreement with acc eleration of the protons by a collisionless shock generated by the CO2 lase r. \n\n*This work is supported by the Naval Research Laboratory Base Progra m and the Department of Energy \n\n LAST-MODIFIED:20160203T142336Z LOCATION:JohnS.Toll Physics Blg (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dynamical Systems & Accelarator Physics Seminar (PHYS 798E & ENEE 6 98D) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140221T180000Z DTEND:20140221T190000Z DTSTAMP:20260828T094430Z UID:cmingluhjs777qiohmalur2od4@google.com CREATED:20140218T143732Z DESCRIPTION:Speaker Name: Joseph G. Tischier\n\nSpeaker Institution : U.S. Naval Research Laboratory\n\nTitle: Tailoring Optoelectronic Properties of PbSe Nanostructures: 0D to 1D\n\nAbstract : Advances in the fabrication an d understanding of colloidally grown nanocrystal quantum dots\, nanorods an d nanowires have been driven by intense interest in their potential applica tions. These applications include biological labels\, as well as tunable op toelectronic devices such as light emitting diodes\, lasers\, detectors and photovoltaics.\n\nIn this talk we show that by controlling the size and sh ape of our nanostructures\, it is possible to tailor optoelectronic propert ies such as\, bandgap\, anisotropic absorption\, electron and hole mobility as well as the exciton (i.e. electron-hole pair) dynamics. In particular\, we report a significant enhancement of multiple exciton generation in PbSe nanorods over nanocrystal quantum dots characterized by a reduction of the threshold energy to 2.3Eg\, which approaches the theoretical limit of 2Eg. We find that while the MEG efficiency is constant for rod aspect ratios be tween 4 and 11\, the Auger recombination rate decreases linearly with incre asing rod length. The apparent contradiction between the length dependence of Auger recombination and the inverse-Auger process of MEG is attributed t o differences in the final density-of-states for each process. These result s point to a means of suppressing Auger recombination without affecting the MEG efficiency\, which is the ideal situation for optoelectronic devices.\ n\nRealization of high efficient nanostructure based optoelectronics requir e further improvements in the electron and hole transport as well as nanost ructure passivation. Current accomplishments in these matters will also be discussed.\n\n LAST-MODIFIED:20140218T143732Z LOCATION:Room 2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140811T150000Z DTEND:20140811T160000Z DTSTAMP:20260828T094430Z UID:5okaoa03iegugea78bcoef9oog@google.com CREATED:20140730T143221Z DESCRIPTION:Speaker Name: Marie Piraud\n\nSpeaker Institution: Ludwig Maxim ilian University of Munich\n\nTitle: "Anderson localization of matter waves in 3D anisotropic disordered potentials"\n\nAbstract: We study quantum tr ansport and Anderson localization of matterwaves in 3 dimensional correlate d disorder\, focusing on the effects of the anisotropy. Understanding the a nisotropy effects is fundamental in several systems\, such as electrons in MOSFETs\, light in biological medium\, liquid crystals\, as well as in ultr acold atoms. A major challenge is to understand whether the anisotropy of t he diffusion tensor is altered by the interference terms at the origin of A nderson localization. In particular\, its anisotropy at the mobility edge r emains to be investigated. So far\, all theoretical analysis have assumed - more or less implicitly - that the anisotropy of the diffusion tensor is p reserved by interference effects [1]\, and have focussed on the vanishing o f diffusion as a whole.\n\nHere\, we present a method to go beyond the stan dard self-consistent theory\, which includes in particular the full anisotr opic structure of the spectral function. It thus avoids the infrared diverg ence [2] of the usual self-consistent theory and\, most importantly\, does not make any assumption on the anisotropy of the renormalized diffusion ten sor when including quantum interference terms. Using a generic model of dis order with elongated correlations\, we find that the diffusion tensor is st rongly affected by the quantum interference terms and that the anisotropy s trongly diminishes in the vicinity of the mobility edge.\n\nOur work paves the way to further investigation with speckle potentials\, which are direct ly relevant to ultracold-atom experiments. It will permit comparison with p revious predictions for the mobility edge [3\,4] and shed new light on ongo ing experiments in the field of ultracold atoms.\n\n[1] P. W\\"olfle and R. N. Bhatt\, Phys. Rev. B 30\, 3542 (1984)\n\n[2] A. Yedjour and B. A. van T iggelen\, Eur. Phys. J. D 59\, 249 (2010)\n\n[3] M. Piraud\, L. Pezz\\'e\, and L. Sanchez-Palencia\, Europhys. Lett. 99\, 50003 (2012)\n\n[4] D. Delan de and G. Orso\, arXiv:1403.3821 (2014)\n\nI will then briefly present my new topic of studies: \n\n"Ultracold atoms in synthetic gauge fields: Densi ty-Matrix Renormalization Group (DMRG) studies"\n\nDMRG is a powerful numer ical technique\, that permits to compute the ground-state and first excited states of strongly-correlated low-dimensional bosonic or fermionic systems .\n\nWe have recently studied the Mott insulating phases of the one-dimensi onal Bose-Hubbard model with Rashba spin-orbit coupling\, focusing on the i nterplay between the synthetic gauge field and the asymmetry of the interac tions [5].\n\nWe are now studying similar systems on ladders of increasingl y broad width\, going towards bi-dimensionality.\n\n[5] M. Piraud\, Z. Cai\ , I. P. McCulloch\, and U. Schollwöck\, Phys. Rev. A 89\, 063618 (2014)\n\n Host: Fred Jendrzejewski\n\nJoin with Google Hangouts: https://hangouts.goo gle.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.5okaoa03iegugea78bcoef9oog &hs=121 LAST-MODIFIED:20140808T150641Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140502T173000Z DTEND:20140502T190000Z DTSTAMP:20260828T094430Z UID:brihssmcnj13t8q7l6jhor7lak@google.com CREATED:20140421T132410Z DESCRIPTION:**Please note new location**\n\nTitle: Inflationary Gravitation al Waves: Recent Advances and Next Steps\n\nSpeaker: Marc Kamionkowski\, Jo hns Hopkins\n\nAbstract: The recent detection of the cosmic microwave backg round signature of inflationary gravitational waves is\, if/when confirmed\ , simply stunning. I will discuss how the measurement is done\, the recent detection\, and its interpretation. I will then review next steps to be t aken with future CMB experiments and with galaxy surveys. LAST-MODIFIED:20140429T132337Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150213T170000Z DTEND:20150213T173000Z DTSTAMP:20260828T094430Z UID:johp3otrnmdc5eofd9msjrmir0@google.com CLASS:PUBLIC CREATED:20150206T173550Z DESCRIPTION:Speaker Name: Shelby Kimmel\n\nSpeaker Institution: QuICS/JQI\n \nTitle: Robust Single-Qubit Process Calibration via Robust Phase Estimat ion\n \nAbstract: An important step in building a quantum computer is cali brating experimentally implemented quantum gates to produce operations that are close to ideal unitaries. The calibration step involves estimating the error in gates and then using controls to correct the implementation. Quan tum process tomography is a standard technique for estimating these errors\ , but is both time consuming\, (when one only wants to learn a few key para meters)\, and requires resources\, like perfect state preparation and measu rement\, that might not be available. With the goal of efficiently estimati ng specific errors using minimal resources\, we develop a parameter estimat ion technique\, which can gauge two key parameters (amplitude and off-reson ance errors) in a single-qubit gate with provable robustness and efficiency .\nIn particular\, our estimates achieve the optimal efficiency\, Heisenber g scaling.​ ​Our main theorem making this possible is a robust version of a non-adaptive​ ​phase estimation procedure.\n\nPlease note that lunch will be provided prior to the seminar LAST-MODIFIED:20150211T205859Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150410T160000Z DTEND:20150410T170000Z DTSTAMP:20260828T094430Z UID:fkef1rd3aeh9i7bjl3ul62qq70@google.com CLASS:PUBLIC CREATED:20150403T114618Z DESCRIPTION:Speaker Name: Seiji Sugawi\n\nSpeaker Institution: JQI\, NIST/ University of Maryland\n \n (Free lunch served right before the talk!)\n\nT itle: Measuring topological invariants in few-level quantum system\n\nAbstr act: Understanding topological nature of physical system is one of the most important topics in modern physics. In condense matter\, non-trivial topol ogical phase is characterized by non-zero Chern number. In particle physics \, solitons and monopole solutions of non-Abelian gauge theories are charac terized by their topological charges. Here\, we prepared few-level quantum system by dressing hyperfine ground states of 87Rb with radio frequency and microwave fields\, and measured the first Chern number in parameter space by observing non-adiabatic response due to local Berry curvature. The non-z ero value of the topological invariants can be understood as resulting from monopole sources. LAST-MODIFIED:20150408T191147Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150506T200000Z DTEND:20150506T210000Z DTSTAMP:20260828T094430Z UID:pd8cvnb5v1ve76fkdmr4tbod84@google.com CREATED:20150428T140324Z DESCRIPTION:Speaker Name: Dr. Yi-Hsin Liu\n\nSpeaker Institution : NASA God dard\n\nTitle : Orientation of x-lines in asymmetric magnetic reconnection\ n\nAbstract : At Earth's magnetopause\, reconnection proceeds asymmetricall y between magnetosheath plasmas\, namely solar wind plasmas compressed by E arth's bow shock\, and magnetospheric plasmas. In an asymmetric configurati on\, it is unclear if there is a simple principle to determine the orientat ion of the x-line. Using fully kinetic simulations\, we study this issue an d a spatially localized perturbation is employed to induce a single x-line\ , that has sufficient freedom to choose its orientation in three-dimensiona l systems. The effect of ion to electron mass ratio is investigated\, and t he x-line appears to bisect the magnetic shear angle across the current she et in the large mass ratio limit. The deviation from the bisection angle in the lower mass ratio limit can be explained by the physics of tearing inst ability. The same principle that determines the orientation of the x-line i n this simple planar current sheet could potentially guide us to find the l ocation of reconnection in a more realistic magnetopause geometry. LAST-MODIFIED:20150428T140538Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150218T210000Z DTEND:20150218T220000Z DTSTAMP:20260828T094430Z UID:0it3rpi3h58mhcrok7ds3b8uts@google.com CREATED:20150209T155421Z DESCRIPTION:The UMD School of Theatre\, Dance\, and Performance Studies pre sents\n"An Experiment"\nJennifer Barclay\, playwright\; Leslie Felbain\, di rector\n4 pm Wednesday\, February 18\, 2015\nCan colleagues within a single department be living in parallel universes? Do they genuinely recognize ea ch other’s absolute value\, or do non-equilibrium states persist? Is effect ive communication possible between different operating systems\, or are syn tax errors inevitable?\n\nPlaywright Jennifer Barclay of the UMD School of Theatre\, Dance\, and Performance Studies explores the topic of intrinsic b ias in An Experiment\, a short fictional comedy based on interviews with me n and women across the country who are active faculty in the sciences. Whi le this play draws upon examples from the discipline of physics\, its theme s can be translated to other fields throughout the world of academia and be yond. The play will debut with a staged reading by UMD faculty and student s.\n\nFollowing the performance\, the audience is invited to participate in a conversation with the cast and a guest panel led by Steve Marcus\, UMD d irector of faculty leadership.\n\nRefreshments will be available beginning at 3:30 PM. For further information\, email cbarger@umd.edu.\n\n\n LAST-MODIFIED:20150211T142849Z LOCATION: Lobby of the Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:An Experiment TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160211T190000Z DTEND:20160211T203000Z DTSTAMP:20260828T094430Z UID:qdcq8pq8l3f0lhslkgugeaer44@google.com CREATED:20160105T180822Z DESCRIPTION:Speaker Name: Thomas Murphy\n\nSpeaker Institution: UMD\n\nTitl e: Tunable Graphene Plasmonics for Terahertz Filters\, Detectors and Modula tors\n\nAbstract: When a conductor is illuminated with light\, its electron s can oscillate in collective motion called a plasmon resonance. In metals\ , these plasmons occur at visible wavelengths\, but in graphene the motion happens at much slower terahertz frequencies\, and the resonant frequency c an be electrostatically tuned by applying a voltage.\nGraphene plasmonics h as the potential to revolutionize terahertz technology – the last great und erdeveloped frequency band of electromagnetic waves. Tunable graphene plas monic resonators have been suggested for use in terahertz filters\, modulat ors\, detectors\, and emitters\, and could find widespread applications in science\, medicine\, security\, and communications. This presentation will discuss progress in the development of practical graphene-based plasmonic devices\, and recent experimental measurements and theoretical models that exploit plasmonic resonances for terahertz detection\, filtering\, and modu lation.\n\nHOST: Chris Lobb LAST-MODIFIED:20160128T202717Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Thomas Murphy\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20150129T133000 DTEND;TZID=America/New_York:20150129T140000 RRULE:FREQ=WEEKLY;UNTIL=20150507T173000Z;BYDAY=TH EXDATE;TZID=America/New_York:20150319T133000 EXDATE;TZID=America/New_York:20150305T133000 EXDATE;TZID=America/New_York:20150423T133000 DTSTAMP:20260828T094430Z UID:hitgc0f9jcus19of1444hep1cs@google.com CREATED:20150115T203203Z LAST-MODIFIED:20150115T205128Z LOCATION:The "new" Toll Room\, Phys. Rm 1305F SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160114T160000Z DTEND:20160114T170000Z DTSTAMP:20260828T094430Z UID:0vrv4agn9cv2varf9id9jounts@google.com CLASS:PUBLIC CREATED:20160104T203518Z DESCRIPTION:Speaker Name: Kristin Beck\n\nSpeaker Institution: MIT\n\nTit le: Engineering Photon-Photon Interactions\n\nAbstract: Deterministic pho ton-photon interactions are a long-standing goal in quantum optical science . In our experiments\, we use an ensemble of atoms inside of a high finesse optical cavity to mediate effective interactions between photons. We show that this interaction can be transistor-like\, where one photon blocks hund reds of photons [1]\, or operate as a (partly) non-destructive detector\, d etecting photons and preserving them some of the time [2]. In a separate ex periment\, we show that a single photon imparts a phase shift of pi/3 on a weak coherent state traveling in another mode [3]. These experiments demons trate increasing control over photons\, which\, with moderate technical imp rovements\, will enable deterministic photonic quantum logic.\n\n \n[1] W. Chen\, K. M. Beck\, R. Bücker\, M. Gullans\, M. D. Lukin\, H. Tanji-Suzuki\ , V. Vuletić. All-Optical Switch and Transistor Gated by One Stored Photon. Science 341\, 768-770 (2013)\n[2] M. Hosseini\, K. M. Beck\, Y. Duan\, W. Chen\, V. Vuletić. Partially Nondestructive Continuous Detection of Individ ual Traveling Optical Photons. arXiv:1511.00559 [quant-ph] (to appear in Ph ysical Review Letters)\n[3] K. M. Beck\, M. Hosseini\, Y. Duan\, V. Vuletić . Large conditional single-photon cross-phase modulation. arXiv:1512.02166 [quant-ph] LAST-MODIFIED:20160107T191358Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140407T203000Z DTEND:20140407T213000Z DTSTAMP:20260828T094430Z UID:bdi6evqapp95buboqc0k9cbfo4@google.com CREATED:20140203T161523Z DESCRIPTION:Speaker Name: Ken McCracken\n\nSpeaker Institution : University of Maryland\, IPST\n\nTitle: A Study of the Cosmic Radiation and the Helio magnetic magnetic fields during the Maunder Minimum of Solar Activity.\n\nA bstract: Measurements of the cosmogenic radionuclide 10Be in two ice-cores from Greenland provide annual measurements of the paleo-cosmic ray (PCR) i ntensity from 1391 to the present. Using the cosmic ray propagation equat ion\, they provide annual estimates of the heliomagnetic field (HMF) streng th near Earth throughout that interval. They show that the cosmic ray int ensities and heliomagnetic fields during the recent long sunspot minimum of 2006-9 were substantially different (PCR lower\, HMF higher) than those du ring the Dalton\, Maunder \, and Spoerer Grand Minima of solar activity. Th e data from the Maunder Minimum (MM) will be discussed in detail. While the sunspot number decreased to zero in 1645\, and remained at very low value s until 1701\, the cosmic ray intensity took five solar cycles to reach it s maximum value. There was a strong eleven year cycle of PCR intensity th roughout the 55 year rising phase . The ratio Bmax / Bmin was computed for all the solar cycles in the MM\, where Bmax is the HMF at solar maximum\; and Bmin is the HMF at the proceeding solar minimum. The ratios lie in th e same range\, with an average value that closely approximates those observ ed by satellites since 1965. This indicates that the solar dynamo operated in a similar manner to the present throughout the MM while the magnetic fie lds in the active centres was\nNotes: Tea and Cookies 4:15-4:30 pm\n\n LAST-MODIFIED:20140326T180324Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160218T140000Z DTEND:20160218T150000Z DTSTAMP:20260828T094430Z UID:ibreir5k4sa7jcsvcn2793f83c@google.com CREATED:20160217T182700Z DESCRIPTION:The schedule for the two-day conference is available here:\nhtt p://www.norbertwiener.umd.edu/FFT/2016/schedule.html\n\nThis is an annual c onference in harmonic analysis that is held at the Norbert Wiener Center in the mathematics department. LAST-MODIFIED:20160217T182831Z LOCATION:UMD Math\, 2nd floor SEQUENCE:0 STATUS:CONFIRMED SUMMARY:2016 February Fourier Talks opening session TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150407T171500Z DTEND:20150407T183000Z DTSTAMP:20260828T094430Z UID:pdfd4r0842782usnpjvhdk4u58@google.com CREATED:20150401T134058Z DESCRIPTION:Speaker Name: Professor Robert Leheny\n\nSpeaker Institution : Johns Hopkins University\n\nTitle: Connecting Nanoscale Dynamics and Mecha nical Properties of Disordered Soft Materials\n\nAbstract : Complex fluids\ , such as polymer solutions and colloidal suspensions\, are distinguished b y their complicated response to mechanical stress. The distinct deformatio n and flow behaviors of such systems arise from the relaxation of internal structure on the nanometer or micrometer scale\; however\, the corresponden ce between this macroscopic mechanical behavior and the microscopic structu ral dynamics is rarely straightforward. In recent years x-ray photon corre lation spectroscopy (XPCS) has emerged as a technique exceptionally suited to characterize the structural dynamics of many complex fluids at the nanom eter length scales relevant to their mechanical behavior. This talk will d escribe a set of related projects employing XPCS on model systems including entangled polymer solutions and colloidal gels that reveal new insight int o the microscopic origins of their mechanical properties.\n LAST-MODIFIED:20150401T134058Z LOCATION:Room 1116\, IPST Bldg. #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151112T210000Z DTEND:20151112T220000Z DTSTAMP:20260828T094430Z UID:vd3aiacrfso1ht5c8fc7ji2gb4@google.com CREATED:20150916T205437Z DESCRIPTION:Speaker: Soeren Schlichting\n\nSpeaker Institution: Brookhaven National Laboratory\n\nTitle: Thermalization process in far-from equilibriu m systems\n\nAbstract: Strongly correlated many-body systems far from equil ibrium are ubiquitous in nature and exist on the most diverse energy scales \, including the dynamics of the early universe as well as the early stages of high-energy heavy-ion collisions. In this talk I will discuss aspects o f the thermalization process in such far-from equilibrium systems and outli ne the similarities and differences between different systems. Most remarka bly\, the thermalization process is found to proceed via non-thermal fixed points\, where the dynamics of the system becomes insensitive to the detail s of the underlying microscopic theory and can exhibit universal behavior f ar from equilibrium. LAST-MODIFIED:20151112T150433Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140313T160000Z DTEND:20140313T170000Z DTSTAMP:20260828T094430Z UID:cv42cjsqrad3904nie4hddn64k@google.com CREATED:20140310T190304Z DESCRIPTION:Speaker Name: Sidney Cahn\n\nSpeaker Institution: Yale Universi ty\n\nTitle: The Search for Nuclear Anapole Moments in Diatomic Molecules:\ n\nAbstract:The Search for Nuclear Anapole Moments in Diatomic Molecules:\n Nuclear spin-dependent parity nonconservation (NSD-PNC) effects arise from e xchange of the Z0 boson (parameterized by the electroweak coupling constant s C2{P\,N } ) between electrons and the nucleus\, and from the interaction of electrons with the nuclear anapole moment\, a parity-odd magnetic moment . The latter scales with the nucleon number A of the nucleus as A3/2\, whil e the Z0 coupling is independent of A\; the former will be the dominant sou rce of NSD-PNC in nuclei with A ≥ 20. NSD-PNC effects can be dramatically am plified in diatomic molecules by bringing two levels of opposite parity clo se to degeneracy in a strong magnetic field. This opens the prospect for mea surements across a broad range of nuclei. As a precursor to the measurement of the nuclear anapole moment of 137Ba\, we have experimentally observed a nd characterized opposite-parity level crossings in 138BaF. These are found to be in excellent agreement with parameter-free predictions and indicate that the sensitivity necessary for NSD-PNC measurements should be within re ach. They have also provided a two-level system in which a form of molecul ar interferometer obtains\, whose fringes exhibit Airy function-like behavi or. \n \n Host: Luis A. Orozco\n\n LAST-MODIFIED:20140311T181528Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140505T150000Z DTEND:20140505T160000Z DTSTAMP:20260828T094430Z UID:d06j6t7e8i6t9294j10ht5kvqg@google.com CLASS:PUBLIC CREATED:20140102T150639Z DESCRIPTION:Speaker Name:Elizabeth Giacobinno\n\nSpeaker Institution: Labo ratoire Kastler Brossel\, Université Pierre et Marie Curie\, Ecole Normale Supérieure\, CNRS\n\nTitle: Microcavity polaritons : from quantum optics to quantum fluids\n\nAbstract: In semiconductor microcavities\, exciton-polar itons are mixed light-matter quasi-particles arising from the strong coupli ng between photons and excitons. Due to their photonic component\, polarito ns can be coherently excited by an incident laser field and detected throug h the emitted light. Due to their excitonic component\, polaritons interact \, which can produce nonlinear effects and modify their dispersion curve. T hese properties have allowed us to demonstrate nonlinear and quantum optica l effects in the microcavity emission as well as quantum fluid properties\, superfluid motion\, solitons and vortices. This opens new perspectives for quantum optronics as well as for quantum simulation. \n\nHost: Luis Orozco LAST-MODIFIED:20140501T133346Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20141015T200000Z DTEND:20141015T210000Z DTSTAMP:20260828T094430Z UID:cqrrtrae4c67bjdj6i4likt5g4@google.com CREATED:20141008T153901Z DESCRIPTION:Speaker Name: James Juno\n\nSpeaker Institution : University of Maryland\n\nTitle: Benchmarking a Discontinuous Galerkin Vlasov-Poisson S olver in Gkeyll\n\nAbstract : Gkeyll is a discontinuous Galerkin (DG) code under development to solve a variety of kinetic equations in plasmas\, with the aim of solving 5D gyrokinetic equations for edge turbulence. For bench -marking the code\, we solved the Vlasov-Poisson system of equations\, mode ling the two-stream instability\, as well as current research in nonlinear wave modes of plasmas\, such as Bernstein\, Green\, and Kruskal (BGK) and k inetic electrostatic electron nonlinear (KEEN) wave modes. Results from Gke yll compared well with linear and nonlinear analysis of the two-stream inst ability\, and matched results of other computational techniques being used to examine BGK and KEEN wave modes. On bounded domains\, we explored sheath plasma physics. These sheath studies will contribute to an understanding o f boundary conditions for gyrokinetic equations in the edge of tokamaks.\n\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kY XIuZ29vZ2xlLmNvbQ.cqrrtrae4c67bjdj6i4likt5g4&hs=121 LAST-MODIFIED:20141008T154048Z LOCATION:ERF 1207\, IREAP Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150928T190000Z DTEND:20150928T203000Z DTSTAMP:20260828T094430Z UID:07lfop9mlma0qelfg6v02qpnu4@google.com CREATED:20150922T185115Z DESCRIPTION:Speaker: David Shih\n\nSpeaker Institution: Rutgers University\ n\nTitle: Natural SUSY Today\n \nAbstract: I will describe the fine-tuning problem in supersymmetric models after LHC Run I and give an overview of th e ideas out there to resolve it.\n\n\nJoin with Google Hangouts: https://ha ngouts.google.com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1 YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.07lfop9mlma0qelf g6v02qpnu4&hs=121 LAST-MODIFIED:20150922T185115Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131216T160000Z DTEND:20131216T170000Z DTSTAMP:20260828T094430Z UID:b6sog61p526gb4d1ku8kdo6tqc@google.com CREATED:20131212T143447Z DESCRIPTION:Speaker: Shelby Kimmel\n\nInstitution: MIT\n\nTitle:"Robust Cha racterization of Quantum Processes"\nAbstract:\nAccurate characterization o f quantum processes is critical for the scaling of quantum computing system s. Understanding the errors that occur in physical systems will both inform the design of future quantum computers and the design of error correcting codes. However\, many characterization procedures suffer from systematic er rors because they assume state preparation\, measurement\, and other contro lling gates are error free. In this talk I will describe a method that can provide estimates of almost all parameters of a quantum map\, yet is robust to many of these types of errors. LAST-MODIFIED:20131213T193138Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150319T180000Z DTEND:20150319T193000Z DTSTAMP:20260828T094430Z UID:4vbdlt9c9nnmu5srej2hp1lljs@google.com CREATED:20150312T195712Z DESCRIPTION:Speaker: Prof. Joel Moore\, UC - Berkeley\n\nTitle: Dynamical consequences of non-Abelian gauge fields and non-Abelian particles in solid s\n\nAbstract: An electron moving through a crystal ceases to be a feature less point particle and acquires structure within the unit cell\, with far- reaching consequences. Although the forces acting on the electron are elec tromagnetic and hence described by a simple (Abelian) gauge theory\, the in ternal structure gives Berry gauge fields that are non-Abelian in the same sense as the fields of quantum chromodynamics (QCD). The Berry gauge field s give the most compact description of the 3D topological insulator phase a nd lead to a general theory of orbital magnetoelectricity. Recent work sug gests that long-standing experiments on natural optical activity (NAO) also probe these Berry gauge fields. Taking the topological insulator phase an d adding superconducting correlations is one of several experimentally prom ising routes to create particles with non-Abelian statistics\, such as an e mergent Majorana fermion excitation. We explain non-Abelian statistics bri efly and discuss recent work on how quantum quench dynamics can show univer sal power laws characterizing various non-Abelian particles. These power l aws can be observed in optical absorption\, similar in spirit to the classi c orthogonality catastrophe in X-ray absorption.\n\nHost. James Williams\n LAST-MODIFIED:20150313T191813Z LOCATION:Room 1201 John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140213T173000Z DTEND:20140213T183000Z DTSTAMP:20260828T094430Z UID:b4dbvp27jpeccsckgsqru6dgt4@google.com CREATED:20140207T142417Z DESCRIPTION:Speaker: Joshua Parker\n\nInstitution: UMD\n\nTitle: A broken -contact order parameter for inferring inter-cellular communication from pa tterns of externally guided migrating cells\n\nAbstract: We propose an ord er parameter for investigating the local spatial organization often seen in migrating cell systems. Using a phenomenological model for the group dynam ics of Dictyostelium discoideum\, we observe that monitoring the fraction o f broken cell-cell contacts over time resolves the characteristic structure s seen in simulations that are not captured by other global order parameter s. We discuss the application of this order parameter to future experimenta l and theoretical work on D. discoideum migration as well as extensions to other biological and physical systems.\n\nSpeaker Matt Harrington \n\nInsti tution: UMD\n\nTitle: 3D dynamics of granular materials: shear\, segregati on\, and rotation\n\nAbstract: A granular material is generally defined as a large collection of discrete\, macroscopic particles which primarily inte ract via repulsive contact forces. Despite the ubiquity of such materials in nature and industry\, many characteristics and phenomena of granular med ia remain difficult to predict and fully describe. The athermal nature of grains percludes these systems from the scope of typical statistical mechan ics and thermodynamics\, while continuum fluid models may neglect vital mic roscopic information. One method of experimentally tackling open problems in granular physics is to implement a three-dimensional (3D) imaging techni que\, which allows one to directly probe individual grain motion and intera ctions. Microscopic dynamics may lead to mesoscopic rearrangements within and across neighborhoods\, and even to bulk phenomena observable at the sys tem scale. One such technique\, refractive index-matched scanning\, allows non-intrusive imaging of a 3D granular pile under quasistatic circular-she ar\, and has led to advances in understanding irreversibility and fracture. In this talk\, I will describe how this technique has been expanded to ch aracterize individual particle rotation and shear-driven segregation—the te ndency of a granular mixture to separate under driving.\n\nNotes: Pizza an d refreshments available for purchase from 12:15 pm\n LAST-MODIFIED:20140207T143019Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151214T200000Z DTEND:20151214T210000Z DTSTAMP:20260828T094430Z UID:8npltmilqh8df98906sg6tei7c@google.com CREATED:20151204T210410Z DESCRIPTION:Speaker: John Wright\n\nSpeaker Affiliation: CMU\n\nTitle: Rand om words\, longest increasing subsequences\, and quantum PCA\n\nAbstract: S uppose you have access to iid samples from an unknown probability distribut ion $p = (p_1\, …\, p_d)$ on $[d]$\, and you want to learn or test somethin g about it. For example\, if one wants to estimate $p$ itself\, then the e mpirical distribution will suffice when the number of samples\, $n$\, is $O (d/epsilon^2)$. In general\, you can ask many more specific questions abou t $p$---Is it close to some known distribution $q$? Does it have high entr opy? etc. etc.----and for many of these questions the optimal sample compl exity has only been determined over the last $10$ years in the computer sci ence literature.\nThe natural quantum version of these problems involves be ing given samples of an unknown $d$-dimensional quantum mixed state $\\rho$ \, which is a $d \\times d$ PSD matrix with trace $1$. Many questions from learning and testing probability carry over naturally to this setting. In this talk\, we will focus on the most basic of these questions: how many s amples of $\\rho$ are necessary to produce a good approximation of it? Our main result is an algorithm for learning $\\rho$ with optimal sample compl exity. Furthermore\, in the case when $\\rho$ is almost low-rank\, we show how to perform PCA on it with optimal sample complexity.\nSurprisingly\, w e are able to reduce the analysis of our algorithm to questions dealing wit h the combinatorics of longest increasing subsequences (LISes) in random wo rds. In particular\, the main technical question we have to solve is this: given a random word $w \\in [d]^n$\, where each letter $w_i$ is drawn iid from some distribution $p$\, what do we expect $\\mathrm{LIS}(w)$ to be? A nswering this question requires diversions into the RSK algorithm\, represe ntation theory of the symmetric group\, the theory of symmetric polynomials \, and many other interesting areas.\nThis is joint work with Ryan O'Donnel l.\n LAST-MODIFIED:20151214T142252Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151201T160000Z DTEND:20151201T173000Z DTSTAMP:20260828T094430Z UID:69t0p51r3t2i71b4uht2ttqsio@google.com CREATED:20151117T213406Z DESCRIPTION:Speaker: Siddharth Parameswaran (University of California\, Irv ine)\n\nTitle: Quantum critical glasses and many-body delocalization\n\nAbs tract: Isolated systems that evade thermalization exhibit behavior more com monly associated with quantum ground states: for instance\, fully many-body localized (MBL) systems show area law entanglement in every eigenstate and robust ordering phenomena. First\, I will apply real-space renormalization group ideas to study a class of "quantum critical glasses" in which (nearl y) every eigenstate exhibits logarithmic entanglement scaling conventionall y associated with one dimensional critical ground states. Such "infinite r andomness" phases are believed to describe critical points between distinct MBL phases\, or stable critical phases of anyonic spin chains [1]. I will also point out an example where an infinite randomness fixed point of a non -interacting theory is disrupted by interactions that break either ergodici ty or symmetry\, preventing the stabilization of certain types of symmetr y-protected topological order by localization [2]. Finally\, I will discuss a simple microscopic model and its associated scaling theory for the trans ition out of the MBL phase\, where ergodicity is restored sharply at an unu sual critical point [3] .\n\nReferences:\n[1] Phys. Rev. Lett. 114\, 217201 (2015).\n[2] arXiv:1510.04282 (2015).\n[3] Phys. Rev. X. 5\, 031033 (2015) .\n\nBased on joint work with R. Vasseur\, A.C. Potter and A.J. Friedman.\n \nHost: Will Cole\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20151117T213406Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160323T150000Z DTEND:20160323T160000Z DTSTAMP:20260828T094430Z UID:rlj79vve1us6hjrgnrh041g644@google.com CREATED:20160212T150715Z DESCRIPTION:Speaker: Antony Milne\n\nSpeaker Affiliation: Imperial College London\n\nTitle: Visualising two-qubit correlations using quantum steering ellipsoids\n\nAbstract: The quantum steering ellipsoid formalism naturally extends the Bloch vector picture to provide a visualisation of two-qubit sy stems. If Alice and Bob share an entangled state then a local measurement b y Bob steers Alice’s Bloch vector\; given all possible measurements by Bob\ , the set of states to which Alice can be steered forms her steering ellips oid inside the Bloch sphere. This gives us a novel geometric perspective on a number of quantum correlation measures such as entanglement\, CHSH nonlo cality and singlet fraction. In particular\, by analysing a tripartite scen ario we find that steering ellipsoid volumes obey a simple monogamy relatio n from which one can derive the well-known CKW (Coffman-Kundu-Wootters) ine quality for the monogamy of entanglement. Remarkably\, we can also use stee ring ellipsoids to derive some highly non-trivial results in classical Eucl idean geometry\, extending Euler's inequality for the circumradius and inra dius of a triangle. LAST-MODIFIED:20160216T212431Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150402T200000Z DTEND:20150402T213000Z DTSTAMP:20260828T094430Z UID:a4t7c12d0ia54sfah57igguvkg@google.com CREATED:20150205T142323Z DESCRIPTION:Speaker Name: S. James Gates\, Jr.\n\nSpeaker Institution: Uni versity of Maryland\n\nTitle: Think Different: Applying the Old MacIntosh M antra\nto the Representation Theory of Supersymmetry\n\nAbstract: The conve ntional and traditional ways of investigating the\nrepresentation theory of supersymmetry have been within\nthe confines of relativistic quantum theor ies of fields and\nstrings. This presentation discusses an array of new to ols\nthat have been proposed in the effort to create a more\ncomplete found ation. LAST-MODIFIED:20150218T215158Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160331T180000Z DTEND:20160331T190000Z DTSTAMP:20260828T094430Z UID:j8s1eg24mrjhg0mrsv54fgsrlk@google.com CREATED:20151109T210513Z DESCRIPTION:SPEAKER: D. Kurt Gaskill\, Naval Research Laboratory\n\nTITLE: Femto-second Laser Patterning of Epitaxial Graphene: A Platform to Study G raphene-Metal Interaction\n\nABSTRACT: In contrast to conventional three-d imensional materials which retain their bulk properties when patterned to f orm electronic devices\, anything that interacts with the two-dimensional g raphene surface during device fabrication modifies its properties. Such sur face sensitivity poses significant difficulties for the fabrications of dev ices\, such as for molecular sensing applications\, with controlled and rep roducible performance as well as impedes understanding the intrinsic intera ction of graphene with other materials such as metals. Here\, we describe a femto-second laser assisted\, large-area\, resist-free lithography techniq ue to fabricate electrically isolated\, pristine graphene surfaces derived from sublimation synthesis on SiC (epitaxial graphene). We select the laser parameters\, i.e.\, wavelength\, beam shape\, optical fluence\, pulse widt h\, focus\, and repetition rate\, to result in sufficient non-equilibrium h eating to ablate graphene on a sub-micron scale to form a precisely defined region without damaging the unilluminated and/or partially illuminated mat erial or the underlying substrate. Using these pristine graphene surfaces\, we studied the interaction of Ni and discovered the interaction on epitaxi al graphene is quite different from CVD formed graphene. From these results \, we propose a model to understand key parameters affecting the contact re sistance resulting from this interaction. This model can be used as a guide to identify strategies for controlling graphene–metal contact resistance.\ n\nHOST: Chris Lobb LAST-MODIFIED:20160325T182631Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: D. Kurt Gaskill\, NRL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150424T170000Z DTEND:20150424T180000Z DTSTAMP:20260828T094430Z UID:pbr07m4d6dsbn4sm8q334id83k@google.com CREATED:20150415T181255Z DESCRIPTION:Speaker Name: Michael Bedzyk\n\nSpeaker Institution: Northweste rn University\n\nTitle: Looking for Atoms at Complex Interfaces\n\nAbstract : Interfacial science by its very nature brings together diverse interests in areas such as: electronic materials\, oxide film growth\, nano-science\, biomembranes\, geochemistry\, surface physics\, catalysis\, and electrical -energy storage. Sophisticated in situ X-ray methods are now being develope d to understand the assembly of atoms\, molecules and supported nanoparticl es at interfaces in complex environments. The talk will introduce the use o f synchrotron X-ray methods for atomic-scale studies of interfaces. Example s will include the use of X-ray reflectivity (XRR)\, X-ray standing waves ( XSW) and X-ray photoelectron spectroscopy (XPS) for studying interfaces for med by the growth of graphene on silicon-carbide and oxide supported monola yer catalyst. The measurements are made at the Advanced Photon Source and t he European Synchrotron Radiation Facility. LAST-MODIFIED:20150415T182009Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150911T160000Z DTEND:20150911T170000Z DTSTAMP:20260828T094430Z UID:eesokaljd7fokhraleuk73aedo@google.com CLASS:PUBLIC CREATED:20150903T170708Z DESCRIPTION:Speaker Name: Ching-Kai Chiu\n \nSpeaker Institution: CMTC\n \n Location and Time: PSC 2136 at 12:00pm (Free lunch served at 11:45)\n\nTitl e: Introduction to the tenfold classification of topological insulators and superconductors\n\nAbstract: The tenfold classification of topological ins ulators and superconductors can be understood in several different approach es\, such as K-theory and nonlinear sigma model. It is known that nontrivia l topological insulators and superconductors possess stable gapless boundar y modes. In this talk\, I will try to classify topological phases under ti me-reversal symmetry\, particle-hole symmetry\, or chiral symmetry by using the simplest approach\, which is the stability of gapless boundary modes u nder symmetries. That is\, we will write down gapless boundary Hamiltonians in the Dirac form and then study the existence of gap opening terms. The a bsence of the gap opening terms leads to nontrivial topology.\n LAST-MODIFIED:20150903T170708Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160301T220000Z DTEND:20160301T230000Z DTSTAMP:20260828T094430Z UID:do4hv5tpia0eig5vggk1o976n0@google.com CREATED:20160211T180700Z DESCRIPTION:Speaker: Harry Weller\n\nSpeaker Institution: NEA General Partn er\, Washington DC\n\nTitle: "Innovation Physics"\n\nBiography: Harry Welle r is the leader of New Enterprise Associates (NEA) east coast venture pract ice and he is also a founder of NEA's China organization. Weller has been recognized as one of America's top ventures capitalists with honors includi ng the Forbes "Media List\," where he is among six investors named to the l ist since inception\, Washingtonian's "Titans of Technology\," Business Ins ider's "Top 5 East Coast VCs" and Washington Business Journal's "Outstandin g Board Director Award" and "Power 100 Business Leaders." He is also a co- founder of Harvard University's Experiment Fund and an Expert in Residence at Harvard.\n\nThe reception will begin at 4:30 pm and the program will sta rt at 5:00 pm in the Kay Boardroom\, Room 1111\, in the Jeong H. Kim Engine ering Building. \n\nRegister for this free event:\nhttps://clarkschool.wufo o.com/forms/whitingturner-lecture-series-harry-weller/ LAST-MODIFIED:20160226T182855Z LOCATION:Room 1111\, in the Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Whiting-Turner lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150305T203000Z DTEND:20150305T213000Z DTSTAMP:20260828T094430Z UID:4ksbc7ga6jf07udhk1chglk2qg@google.com CREATED:20150227T141014Z DESCRIPTION:Speaker: Stephen Randall and William Linch\nAbstract: We'll dis cuss how (super)Lie algebra cohomology makes it possible to organize all th e Bianchi identities for superforms\, which previously didn't appear to fol low any particular pattern. Reference: arXiv:1412.4686. LAST-MODIFIED:20150227T141014Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bianchi identities and (super)Lie algebra cohomology TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131204T180000Z DTEND:20131204T190000Z DTSTAMP:20260828T094430Z UID:tm9m0edfk41ru5n5shrf5v5aj0@google.com CLASS:PUBLIC CREATED:20131125T214246Z DESCRIPTION:Speaker: Christina Kraus\nInstitution: Innsbruck\nTitle:Major ana fermions in cold atom systems\nAbstract:Majorana fermions are non-abeli an quasi-particles that appear at edges and defects of topological supercon ductors. In this talk\, possibilities to create\, detect and manipulate the m in cold atom systems will be explored. \n \nHost: Luis A. Orozco LAST-MODIFIED:20131203T214257Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150505T150000Z DTEND:20150505T160000Z DTSTAMP:20260828T094430Z UID:8jfnu2jbbn4qifkkk8tn6495m8@google.com CREATED:20150504T195046Z DESCRIPTION:Deputy Asst. Secretary for Renewable Energy\nU.S. Department of Energy\nSteven Chalk will lead a seminar that explores the development\, p rogress\, and market potential of energy efficiency and renewable energy te chnologies. He will discuss the major technical and economic barriers assoc iated with deploying solar- and wind-based power solutions\, new transporta tion technologies such as hydrogen fuel cells for cars\, advanced batteries and infrastructure-compatible biofuels\, and innovative manufacturing tech nologies. LAST-MODIFIED:20150504T195046Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:THE CLEAN ENERGY RACE - Steven Chalk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151210T173000Z DTEND:20151210T183000Z DTSTAMP:20260828T094430Z UID:su4mjmg67luuptr8g45314uu1o@google.com CREATED:20151001T185543Z DESCRIPTION:The Spectrum of Wind Power Fluctuations\nMahesh Bandi\nOkinawa Institute of Science and Technology LAST-MODIFIED:20151001T185543Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141016T183000Z DTEND:20141016T193000Z DTSTAMP:20260828T094430Z UID:crb2ars3v8bdj036k46uu3u8cs@google.com CREATED:20141016T154924Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAu Y2FsZW5kYXIuZ29vZ2xlLmNvbQ.crb2ars3v8bdj036k46uu3u8cs&hs=121 LAST-MODIFIED:20141016T154930Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Drew/Kate DOE reservations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140325T171500Z DTEND:20140325T183000Z DTSTAMP:20260828T094430Z UID:7s8fpltdj2u07ug5fr76r6rpas@google.com CREATED:20140312T141617Z DESCRIPTION:Speaker Name: Shane Squires\n\nSpeaker Institution: University of Maryland\n\nTitle: Not with a Bang: Weakly Explosive Percolation in Dir ected Networks\n \nNotes: As in the past\, each seminar will be preceded by an Informal Cafeteria Lunch to which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon). \n\nFor further information co ntact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu (301)405-4439 Pr ofessor John Weeks\, jdw@umd.edu\, (301)405-4802 Professor Michelle Girvan\ , Girvan@umd.edu\, (301)405-1610\n\n LAST-MODIFIED:20140312T141617Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160323T200000Z DTEND:20160323T210000Z DTSTAMP:20260828T094430Z UID:1D3FFBB8-40E6-4783-A4A7-68B95653780C CREATED:20160315T192356Z DESCRIPTION:Speaker Name: Dr. Vadim Roytershteyn\n\nSpeaker Institution : S pace Science Institute\n\nTitle : Magnetic Reconnection in Collisionless Pl asma Turbulence\n\nAbstract : In a broadly accepted picture of plasma turbu lence\, energy injected at a sufficiently large scale is transported down t he scales by nonlinear interactions in an essentially lossless manner. Even tually\, one or more dissipation mechanisms terminate the cascade by transf erring the energy of magnetic field and velocity fluctuations into thermal energy. In contrast to fluid turbulence\, the dissipation in collisionless plasmas is provided by collective modes rather than binary collisions. More over\, several distinct dissipation mechanisms are possible. Magnetic recon nection is one such mechanism that has been conjectured to play a significa nt role. The most appealing arguments supporting this conjecture come from MHD simulations that routinely demonstrate formation of current sheets (pre ferred sites for magnetic reconnection) across all available scales. Howeve r\, MHD formalism does not provide an accurate description of magnetic reco nnection due to lack of kinetic effect! s. I will review recent efforts to understand the role of magnetic reconnection in dynamics of collisionless t urbulence at scales below ion kinetic scale (gyroradius and or ion inertial length)\, specifically those utilizing fully kinetic particle-in-cell simu lations.\n LAST-MODIFIED:20160316T134127Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131017T180000Z DTEND:20131017T193000Z DTSTAMP:20260828T094430Z UID:srk49tq31ed83ei4qi8nposqks@google.com CREATED:20130918T131214Z DESCRIPTION:Speaker: Pablo Jarillo-Herrero\, MIT\n\nTitle: TBD\n\nAbstrac t: TBD:\n\nHost: Johnpierre Paglione LAST-MODIFIED:20130918T131221Z LOCATION:Phys Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141014T171500Z DTEND:20141014T183000Z DTSTAMP:20260828T094430Z UID:so882daa3rq7m1n53vnf7hvae8@google.com CREATED:20141002T135413Z DESCRIPTION:Speaker Name: Professor Paul Brumer\n\nSpeaker Institution: Uni versity of Toronto\n\nTitle: Molecules in Heat Baths: Quantum Coherence in the Excitation of Light Harvesting Systems with Natural Incoherent Light?\n \nAs in the past\, each seminar will be preceded by an Informal Cafeteria L unch to which all are welcome\, departing from room 1108 above five minutes after 12:00 (Noon).\n\nFor further information contact:\nProfessor Christo pher Jarzynski\, cjarzyns@umd.edu (301)405-4878 Professor John Weeks\, jdw@ umd.edu\, (301)405-4802 Professor Michelle Girvan\, Girvan@umd.edu\, (301)4 05-1610.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hang outs/_/physics.umd.edu/informal?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.so882daa3rq7m1n53vnf7hvae8&hs=121 LAST-MODIFIED:20141010T202407Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150424T160000Z DTEND:20150424T170000Z DTSTAMP:20260828T094430Z UID:doul5c1vj0jceqbpi0ve9qb80s@google.com CLASS:PUBLIC CREATED:20150416T182248Z DESCRIPTION:Speaker Name: Bill Fefferman\n\nSpeaker Institution: JQI/QuICS \n \nTitle- The classical power of quantum computation\n\nAbstract- How po werful are quantum computers? Despite the prevailing belief\nthat quantum computers are more powerful than their classical\ncounterparts\, this remai ns a conjecture backed by little formal\nevidence. Shor’s algorithm\, for instance\, gives an example of a\nproblem (factoring)\, which can be solved efficiently on a quantum\ncomputer with no known efficient classical algor ithm. Factoring\nhowever\, is unlikely to be NP-Hard\, meaning that few un expected formal\nconsequences would arise\, should such a classical algorit hm be\ndiscovered. Could it then be the case that any quantum algorithm ca n be\nsimulated efficiently classically? Likewise\, could it be the case\n that quantum computers can quickly solve problems much harder than\nfactori ng? In particular\, what classical computational resources do\nwe need to solve the hardest problem that has an efficient quantum\nalgorithm?\n\nIn t his seminar\, we address these questions and give an overview of\nrecent re search proving that quantum computers can sample from\ndistributions that c annot be sampled efficiently by classical computers.\nNo prior knowledge of complexity theory will be assumed.\n\n​IMPORTANT NOTE- Free Lunch served a t 11:45 LAST-MODIFIED:20150423T154216Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151125T190000Z DTEND:20151125T203000Z DTSTAMP:20260828T094430Z UID:i5j2svuk5jop78c5lal8ackgu8@google.com CREATED:20151120T191731Z DESCRIPTION:Speaker: Boris J Kayser\n\nSpeaker Institution: Fermilab\n\nTit le: The Impact of Sterile Neutrinos on the Search for Leptonic CP Violation \n\nAbstract: We will very briefly review the hints that light sterile neut rinos may exist. Then we will show that\, if real\, such neutrinos could ve ry significantly affect the interpretation of the future long-baseline neut rino oscillation experiments that will probe whether leptons violate CP sym metry. Long-baseline measurements could appear to indicate that CP violatio n is small or absent\, when in fact it is large. Measurements interpreted a s determining the sole oscillation-relevant CP-violating phase in the lepto nic mixing matrix could in fact be measuring something else. The conclusion is that we need to find out whether light sterile neutrinos actually exist or not. \n\nJoin with Google Hangouts: https://hangouts.google.com/hangou ts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBA Z3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.i5j2svuk5jop78c5lal8ackgu8&hs=121 LAST-MODIFIED:20151123T140354Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141117T213000Z DTEND:20141117T223000Z DTSTAMP:20260828T094430Z UID:2p94a9o3fqbnn5fp0ob7vaq1bk@google.com CREATED:20141013T180500Z DESCRIPTION:Speaker Name: Shri Kanekal\n\nSpeaker Institution : Goddard Spa ce Flight Center\n\nTitle: The Dynamical Radiation Belts: New results from the Van Allen Probes mission\n\nAbstract: The Van Allen Probes mission co mprises of two identically instrumented spacecraft launched late August 201 2. They carry a comprehensive suite of instruments that characterize charge d particles\, electric and magnetic fields\, and plasma waves in the Earth' s radiation belts. In particular\, the ECT suite of instruments comprising of HOPE\, MagEIS and REPT instruments measure electrons\, protons and ions and their angular distributions over energies ranging from a few eV to seve ral tens of MeV. Measurements from Van Allen Probes have made significant a nd paradigm-shifting contributions towards the understanding of the physics of charged particles in the Earth's radiation belts. I will describe the V an Allen Probes mission emphasizing the ECT instrument suite and highlight recent science results especially those pertaining to the dynamics of elect ron energization and loss in the outer radiation belt. I am also leading th e CeREs CubeSat mission\, which will complement the Van Allen probes\, and which time permitting\, I will briefly describe.\n\nNotes: Coffee\, Tea & C ookies 4:15-4:30 PM\n\nJoin with Google Hangouts: https://hangouts.google.c om/hangouts/_/physics.umd.edu/space-and?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0a mZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.2p94a9o3fqbnn5fp0ob7vaq1bk&hs=121 LAST-MODIFIED:20141103T140516Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150626T160000Z DTEND:20150626T170000Z DTSTAMP:20260828T094430Z UID:gt331eduh16r1efljdnlf27t80@google.com CLASS:PUBLIC CREATED:20150618T155603Z DESCRIPTION:Speaker- Ulrich Poschinger\, Universität Mainz\, Germany\n \nT itle- Experiments with Trapped Ions in Microstructured Traps\n\nAbstract- I report about two recent experiments from the Mainz ion trapping group\, wh ere the shuttling capabilities of microstructured segmented Paul traps are harnessed. I will start by briefly outlining our experimental platform. I w ill then present measurements where two spin qubits are entangled\, separat ed and shuttled to separate trap segments. Based on this\, we show that ent angled\, separated qubits can be used to map out the quantizing magnetic fi eld along a large distance range. We find that for odd Bell states\, entan glement persists for separation distances as far as about 5mm and hold time s as long as 20ms. However\, we observe slow drifts of the Bell state phase for separated ions. We therefore see an unexpected source of decoherence\, which needs to be controlled in order to pave the way for scalable quantum computing with a trapped-ion platform.\n\nThe second topic I will talk abo ut is the control and usage of phase-stable free-space standing waves\, i.e . optical lattices\, for trapped ions. I first show how we establish contro l over the absolute optical phase of a standing wave on short timescales. I will then present results from a first application of this technique. Firs t\, I show how the standing wave is employed as a ruler for measuring the l ocalization of the ion with 6nm accuracy over a range of 120um\, which allo ws for mapping out the electric fields generated by the trap electrodes. Se cond\, I show how optical kicks can be used in conjunction with electrical kicks to apply phase-controlled displacement operations. Finally\, I will d iscuss ideas for possible future applications. LAST-MODIFIED:20150618T155603Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131125T210000Z DTEND:20131125T220000Z DTSTAMP:20260828T094430Z UID:28ajuu1vt2kmf47kq1ufo4skm0@google.com CLASS:PUBLIC CREATED:20131122T134959Z DESCRIPTION:Speaker: Na Young Kim\, Stanford\n\nTitle: Exciton-Polariton Qu antum Fluids\n\nAbstract:\nMicrocavity exciton-polaritons are hybrid quantu m quasi-particles as admixtures of cavity photons and quantum-well excitons . The inherent light-matter duality provides experimental advantages to for m coherent condensates at high temperatures (e.g. 4-10 K in GaAs and room t emperatures in GaN materials)\, investigating hydrodynamic vortex propertie s\, superfluidity\, and low energy quantum state dynamics.\nIn this talk\, I will present our recent research focus in two fundamental aspects of quan tum fluids: (1) the first-order spatial correlation function of exciton-pol ariton condensates in the context of the Berezinskii-Kosterlitz-Thouless tr ansition\; (2) theoretical proposal of a dipolariton system\, which can exp lore the crossover between the Bose-Einstein condensation and the Bardeen-C ooper-Schrieffer phases in solid-state systems. We think that exciton-polar iton systems will deepen our understandings of quantum fluids nature\, upon which we will further develop a controllable solid-state platform for quan tum simulator applications.\n LAST-MODIFIED:20131122T134959Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150409T163000Z DTEND:20150409T173000Z DTSTAMP:20260828T094430Z UID:6b67rtn0ijgcg565o5msvs7u9g@google.com CREATED:20150406T145102Z DESCRIPTION:Speaker Name: Prof. Evelyn Sander\, George Mason University\n\ nSpeaker Institution: George Mason University\n\nTitle: Colored Noise in Nucleation LAST-MODIFIED:20150406T145253Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160127T160000Z DTEND:20160127T170000Z DTSTAMP:20260828T094430Z UID:0i4ql969lrmajf6hgqnk5u7dd4@google.com CREATED:20151201T203524Z DESCRIPTION:Speaker Name: Carl Miller\n\nSpeaker Institution: U. Michigan\n \nTitle: Random number generation from untrusted quantum devices\n\nAbstrac t: Is it possible to create a source of provable random numbers? If the an swer to this question is "yes\," it would be of importance in information s ecurity\, where the safety of protocols such as RSA depends on the ability to generate random encryption keys. Bell inequality violations offer a pot ential solution: if a device exhibits a Bell inequality violation\, then it s outputs must have been computed by some quantum process and are therefore random. But\, quantifying the amount of randomness that arises by this me thod is a difficult problem\, and it motivates some intricate and beautiful mathematics.\n \nIn the talk I will present my work with Yaoyun Shi\, whic h offered the first robust security proof for randomness expansion from Bel l inequality violations. Any violation of the Clauser-Horne-Shimony-Holt i nequality (as well as others) can be used to produce uniformly random bits. Our proofs\, though they involve some mathematical heavy-lifting\, ultima tely reduce to two simple principles. The first is the notion of self-tes ting: for some Bell inequalities\, a maximal violation allows us to deduce both the state and the measurements used. The second is a principle of mea surement disturbance: if a measurement significantly alters a quantum state \, then the outcome of the measurement must be random.\n \nReferences: arXi v:1411.6608 and arXiv:1402.0489.\n LAST-MODIFIED:20160121T212321Z LOCATION:3100A Computer and Space Sciences Building\, Bldg 224 Stadium Dr\, College Park\, MD 20742 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141117T200000Z DTEND:20141117T213000Z DTSTAMP:20260828T094430Z UID:tjpobg4rlksckfhbih9tp49fco@google.com CREATED:20141111T140256Z DESCRIPTION:Speaker Name: Christopher Verhaaren\n\nSpeaker Institution: UMD \n\nTitle: Dynamics and Duality of a Stabilized Radion\n\nAbstract: We cons ider the couplings of the radion of Randall-Sundrum models to SM fields pr opagating in the bulk of the space\, taking into account effects arising fr om the dynamics of the Goldberger-Wise (GW) scalar that stabilizes the size of the extra dimension. We obtain a detailed interpretation of the results in terms of the holographic dual of the radion\, the dilaton. In doing so\ , we determine how the familiar identification of the parameters on the two sides of the AdS/CFT correspondence is modified in the presence of couplin gs of the bulk Standard Model fields to the GW scalar. We find that correct ions to the form of the dilaton couplings from effects associated with the stabilization of the extra dimension are suppressed by the square of the ra tion of the dilaton mass to the Kaluza-Klein scale\, in good agreement with results from the CFT side of the correspondence. \n\nJoin with Google Hang outs: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hc eid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ. tjpobg4rlksckfhbih9tp49fco&hs=121 LAST-MODIFIED:20141113T213817Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151102T200000Z DTEND:20151102T213000Z DTSTAMP:20260828T094430Z UID:mksktu492d6gf8bqdsr7qai24o@google.com CREATED:20151019T182137Z DESCRIPTION:Speaker Name: David Poland\n\nSpeaker Institution: Yale Univers ity\n\nTitle: CFTs Old and New from the Bootstrap\n\nAbstract: The conforma l bootstrap gives a powerful and rigorous way to learn about strongly-inter acting conformal field theories and critical phenomena. I will discuss rece nt results from the conformal bootstrap in 3 and 4 dimensions\, making prec ise predictions in known CFTs such as the 3D Ising\, O(N) vector\, and Gros s-Neveu models\, as well as giving exciting evidence for possible new confo rmal field theories.\n\nJoin with Google Hangouts: https://hangouts.google. com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mksktu492d6gf8bqdsr7qai24o&hs= 121 LAST-MODIFIED:20151030T185458Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140205T183000Z DTEND:20140205T200000Z DTSTAMP:20260828T094430Z UID:lc1mo651msq9i7cd3sq75t87do@google.com CREATED:20140116T165404Z DESCRIPTION:Title: Enabling time-domain gravitational-wave astronomy with s ingular value decomposition of template waveforms\n\nSpeaker: Chad Hanna\, Pennsylvania State University\n\nAbstract: We anticipate tens of detections of compact binary mergers per year with\nAdvanced LIGO and Virgo. We hope that some of the detected mergers will be\naccompanied by observable elect romagnetic counterparts. Having real-time\ngravitational wave detections m ay permit the observation of the promptest\nelectromagnetic emission. Time -domain gravitational-wave searches are\,\nhowever\, computationally demand ing. I will discuss how singular value\ndecomposition applied to template waveforms can dramatically improve the\nprospects for time-domain gravitati onal-wave astronomy. I will also discuss\nthe broader impacts of this tech nique in other areas of gravitational-wave\nastronomy. LAST-MODIFIED:20140203T180337Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150922T150000Z DTEND:20150922T161500Z DTSTAMP:20260828T094430Z UID:0vleln3jmpro1m9pocujrdhlvk@google.com CREATED:20150914T174628Z DESCRIPTION:Edward J. Maginn\nComputational Molecular Science and Engineeri ng Laboratory\nDepartment of Chemical and Biomolecular Engineering\nUnivers ity of Notre Dame\n\nIonic liquids – salts that are liquid in their pure st ate under ambient conditions – are a fascinating class of materials that ar e being investigated intensely for a wide range of technical applications. Over the last several years\, we have utilized atomistic-level simulations to understand and predict how the physical properties of ionic liquids are related to their structure and composition. Armed with this information and in collaboration with experimental colleagues\, we have developed (and pat ented) several types of new ionic liquids with properties tuned for applica tions as diverse as CO2 capture\, heat transfer\, energy storage and air co nditioning.\n\nThis talk will highlight some of our recent efforts at compu ting the thermodynamic and transport properties of ionic liquids in both th eir pure state and when mixed with other compounds. Our simulations have re vealed that ionic liquids do not necessarily dissociate fully when dissolve d in polar solvents\, and that this can lead to some unusual (and potential ly beneficial) behavior. We discuss ways of predicting the dynamical proper ties of ionic liquids and how these properties can be correlated with short -time ion pair lifetimes. This latter feature enables us to incorporate the se calculations in high throughput “materials genome”-type studies. LAST-MODIFIED:20150914T174628Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Seminar Series: Edward J. Maginn TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151026T190000Z DTEND:20151026T203000Z DTSTAMP:20260828T094430Z UID:cmm45l1a3n76t9o2vvqhumsrpo@google.com CREATED:20151022T150601Z DESCRIPTION:Speaker: Gustavo Burdman\n\nSpeaker Institution: University of Sao Paulo\n\nTitle: Scalar Leptons in Folded Supersymmetry\n\nAbstract: Th e discovery of the Higgs boson and the absence of new physics signals at t he LHC result in important constraints on natural theories of the electrowe ak scale. The main bounds come from new states that couple to QCD and there fore are easily produced at hadron colliders. The situation can be ameliora ted in extensions of the standard model \nthat do not contain such states. Folded Supersymmetry is one example\, in which the scalar states responsibl e for canceling the UV sensitivity of the Higgs mass are charged under a ne w strong interaction. I will review Folded SUSY and its phenomenological s tatus\, emphasizing the bounds and phenomenology that arise from the lepton sector of the theory. \n\nJoin with Google Hangouts: https://hangouts.goog le.com/hangouts/_/physics.umd.edu/speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZ qcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.cmm45l1a3n76t9o2vvqhumsrpo& hs=121 LAST-MODIFIED:20151022T150601Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160407T180000Z DTEND:20160407T193000Z DTSTAMP:20260828T094430Z UID:88s0kirgporarlmf04300mtfis@google.com CREATED:20160328T194225Z DESCRIPTION:Speaker Name: James Analytis\n\nSpeaker Institution: Universi ty of California\, Berkeley\n\nTitle: "Weyl WigglesL Quantum oscillatory st udies of Weyl and Dirac semimetals"\n\nAbstract: Dirac semi-metals show a l inear electronic dispersion in three dimensions described by two copies of the Weyl equation\, a theoretical description of massless relativistic ferm ions. At the surface of a crystal\, the breakdown of fermion chirality is e xpected to produce topological surface states without any counterparts in h igh-energy physics nor conventional condensed matter systems\, the so-calle d “Fermi Arcs”. Here we present Shubnikov-de Haas oscillations in Focused I on Beam prepared microstructures of Cd3As2 that share characteristics of su rface and bulk states as expected for “Weyl orbits”\, the theoretically pre dicted cyclotron path that weaves together Fermi arc and chiral bulk states . In contrast to conventional cyclotron orbits\, these are governed by the chiral bulk dynamics rather than the common momentum transfer due to the Lo rentz force. Our observations provide evidence for direct access to the top ological properties of charge in a transport experiment\, a first step towa rds their potential application.\n\nHOST: James Williams LAST-MODIFIED:20160401T152618Z LOCATION:room 1201\, John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: James Analytis\, University of California\, Berkel ey TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151209T183000Z DTEND:20151209T193000Z DTSTAMP:20260828T094430Z UID:ln0rlf138brppltvqfv6qo96po@google.com CREATED:20151204T210226Z DESCRIPTION:Speaker: Shawn Cui\n\nSpeaker Affiliation: UCSB\n\nTitle: Topol ogical quantum computation and compilation\n\nAbstract: Topological quantum computation is a fault tolerant protocol for quantum computing using non-a belian topological phases of matter. Information is encoded in states of mu lti-quasiparticle excitations(anyons)\, and quantum gates are realized by b raiding of anyons. The mathematical foundation of anyon systems is describe d by unitary modular tensor categories. We will show one can encode a qutri t in four anyons in the SU(2)_4 anyon system\, and universal qutrit computa tion is achieved by braiding of anyons and one projective measurement which checks whether the total charge of two anyons is trivial. We will also giv e an algorithm to approximate an arbitrary quantum gate with the ones from the anyon system. The algorithm produces more efficient circuits than the S olovay-Kitaev algorithm. Time allowed\, applications in quantum complexity classes will also be addressed. LAST-MODIFIED:20151208T120558Z LOCATION:3100 Computer and Space Sciences Building\, College Park\, MD 2074 2 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150916T193000Z DTEND:20150916T203000Z DTSTAMP:20260828T094430Z UID:p98di8ih5d78dthbmjh4l3ddmk@google.com CREATED:20150916T132552Z DESCRIPTION:Title : Beyond Nanotechnology - Achieving "Meso" via Directed S elf Assembly\nSpeaker Name: Professor Ray Phaneuf\, Department of Materials Science and Engineering\, University of Maryland\nAbstract : Nanotechnolo gy is by now regarded by many as a mature field\, leaving the question as t o what comes next. A logical answer is based upon analogy with biological s ystems: hierarchical assembly of structures at increasing length scales\, e ach step leading to additional functionality. In this vision the next step should be assembly of nanoscale objects into mesoscale assemblies – leading to “emergent” functional properties. A crucial issue is how to achieve ext remely large densities of nanostructures with controlled placement on a pra ctical time scale. In this talk I first describe an approach toward directi ng self assembly of nanostructures\, using lithographic patterning of in a prototypical system: GaAs(001). Both kinetic Monte Carlo (kMC) simulations and molecular beam epitaxial (MBE) growth experiments that patterning in th e presence of an “Ehrlich-Schwoebel (ES) barrier” can be used to direct the self assembly of mounds [1-3]. In the initial stage of growth\, the patter n directs the spontaneous formation of multilayer islands at certain sites between neighboring nanopits\, seemingly due to the presence of an kinetic barrier. However\, as growth continues\, the height of certain mounds “self -limits”: the mounds cease to grow. Beyond this point an initially less fav ored site dominates and a different pattern of self assembled mounds begins . We propose that a minimum\, ‘critical terrace size’ at the top of each mo und is responsible for the observed self-limiting growth (SLG) behavior. Ne xt I’ll discuss a system in which new optical response is expected to emerg e from directed mesoscale assembly\, and finally\, how this assembly and re sponse might be tuned for reconfigurability under external stimulus.\n[1] “ Directed Kinetic Self-Assembly of Mounds on Patterned GaAs(001): Tunable Ar rangement\, Pattern Amplification and Self-Limiting Growth”\, Chuan-Fu Lin\ , Hung-Chih Kan\, S. Kanakaraju\, C.J.K. Richardson\, and R.J Phaneuf\, Nan omaterials 4\, 344 (2014)\n[2] “Growth instability on GaAs(001): Evidence f or Large Characteristic Length Scale\,” Chuan-Fu Lin\, Hung-Chih Kan\, S. K anakaraju\, C.J.K. Richardson\, R.J Phaneuf\, Journal of Crystal Growth\, 3 81\, 83 (2013)\n[3] “Directing Self Assembly of Nanostructures Kinetically: Patterning and the Ehrlich Schwoebel Barrier\,” C.-F. Lin\, H.C. Kan\, A.B .H. Hammouda\, and R. J. Phaneuf\, Physical Review B 85\, 085421 (2012) LAST-MODIFIED:20150916T132552Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150422T200000Z DTEND:20150422T210000Z DTSTAMP:20260828T094430Z UID:od2vuo879tnpr9ndllds5oj1ls@google.com CREATED:20150416T130905Z DESCRIPTION:Speaker Name: Dr. John O'Bryan\n\nSpeaker Institution : Univers ity of Maryland\, Baltimore County\n\nTitle : Numerical Investigation of Sp heromak Formation Efficiency\n\nAbstract : Nonlinear numerical computation with the NIMROD code is used to investigate the effect of the gun current p rofile on bounded spheromak plasma formation and sustainment with coaxial h elicity injection (CHI). The goal of this research is to maximize the rate of injected helicity and improve confinement by determining and controllin g the CHI gun current parameters that will optimize spheromak performance. Our approach for this study is to expand beyond the achievable operational regimes of previous experiments in order to find candidate modes of operati on for future experimental studies. In particular\, we study the effect of differing ramp rates of gun current (dIg/dt)\, including rates much greate r than those achieved experimentally on the Sustained Spheromak Physics eXp eriment (SSPX). Due to plasma inductance\, fast ramp rates for the gun cur rent will produce larger bias voltages across the injector gap\, and theref ore\, increase the rate of magnetic helicity injection. This will increase the helicity available to be transferred to closed magnetic surfaces durin g reconnection and self-organization\, resulting in a spheromak with a grea ter degree of twist in the closed torus and improved confinement. While th is research initially studies spheromak plasmas in the SSPX flux conserver geometry\, it is not a direct continuation of previous SSPX simulation camp aigns. Eventually\, we plan to study the spheromak performance with differ ent flux conserver designs\, including a planar coaxial helicity injection gun. LAST-MODIFIED:20150416T131030Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140225T160000Z DTEND:20140225T173000Z DTSTAMP:20260828T094430Z UID:pm13c1g6li854s647pklless58@google.com CREATED:20140114T155323Z DESCRIPTION:Speaker: Junhua Zhang (William and Mary)\n\nTitle: Novel elect ronic states in graphene-based heterostructures\n\nAbstract: I will present our recent progress in the search for\, and understanding of\, novel elect ronic states in graphene-based heterostructures. First\, I will show that in heterostructures formed by one sheet of single layer graphene (SLG) and one sheet of bilayer graphene (BLG) the ground state is a chiral p-wave sup erfluid state coexisting with a s-wave superfluid state [1]. I will then sh ow that due to the chiral nature of the p-wave state SLG-BLG heterostructur es support a topologically protected midgap state analogous to the Majorana fermion of a chiral p-wave superconductor. We find that the coexistence of the two superfluid states and the chirality of the p-wave state is due to the difference between the chirality of the quasiparticles in SLG and the o nes in BLG\, and is therefore a robust effect\, not affected\, for example\ , by the presence of disorder. I will show how\, on the other hand\, for i solated BLG the influence of disorder gives rise to an interesting crossove r behavior between the proposed competing ordered states\, the fully gapped state and the nematic one\, and provide a simple and natural scenario to r esolve the discrepancy between the recent experimental observations. Next\ , I will discuss the proximity effect in graphene-topological insulator het erostructures both in the case of commensurate and incommensurate stacking. I will show that the induced spin and pseudospin textures in this combinat ion of two Dirac materials are highly nontrivial. [2].\n\n[1] *Chiral super fluid states in hybrid graphene heterostructures*\nJunhua Zhang\, E. Rossi\ n/Phys. Rev. Lett./ *111*\, 086804 (2013) \n\n[2] *Proximity effect in graphene-topological insulator heterostructures *\nJunhua Zhang\, C. Triola\, E. Rossi\n[arXiv:1308.6287] \n\nHost: Ed Barnes\n\nhttp://www.physics .umd.edu/cmtc/seminars.html LAST-MODIFIED:20140114T155726Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151203T200000Z DTEND:20151203T213000Z DTSTAMP:20260828T094430Z UID:qrd7d32tl3gvlevpthsnfq9hlc@google.com CREATED:20151117T170240Z DESCRIPTION:Speaker Name: Yi Yin\n\nSpeaker Institution: Brookhaven Nationa l Laboratory\n\nTitle: New Theoretical Developments on Search for QCD Criti cal Point\n\nAbstract: Fluctuations of conserved quantities are important i ndicators of QCD critical point. We have derived a set of equations describ ing the real time evolution of non-Gaussian fluctuations in QCD critical re gime by taking both universal equilibrium properties and universal non-equi librium physics into account. We have applied our equations to model Beam e nergy scan program in heavy-ion collision experiment and illustrate importa nce of memory effect on search for QCD critical point. Finally\, I will dis cuss two new observables which are sensitive to the presence of critical po int: heavy-quark diffusion and bulk viscous pressure. LAST-MODIFIED:20151202T191011Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20151207T110000 DTEND;TZID=America/New_York:20151207T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20151207T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker Name: Boris Altshuler\n\nSpeaker Institution: Columbia University\, New York\n\nTitle: Between Localization and Ergodicity in Qua ntum Systems\nAbsract: Strictly speaking the laws of the conventional Stati stical Physics\, in particular the Equipartition Postulate\, apply only in the presence of a thermostat. For a long time this restriction did not look crucial for realistic systems. Recently there appeared two classes of quan tum many-body systems with the coupling to the outside world that is (or is hoped to be) negligible: (1) cold quantum gases and (2) systems of qubits\ , which enjoy a continuous progress in their disentanglement from the envir onment. To describe such systems properly one should revisit the very found ations of the Statistical Mechanics. The first step in this direction was t he development of the concept of Many-Body Localization (MBL) [1]: the sta tes of a many-body system can be localized in the Hilbert space resembling the celebrated Anderson Localization of single particle states in a random potential. Moreover\, one-particle localization of the eigenfunctions of th e Anderson tight-binding model (on-site disorder) on regular random graphs (RRG) strongly resembles a generic MBL.\n MBL implies that the state of the system decoupled from the thermostat depends on the initial conditions: th e time averaging does not result in equipartition distribution\, the entrop y never reaches its thermodynamic value i.e. the ergodicity is violated. Va riations of e.g. temperature can delocalize many body states. However\, the recovery of the equipartition is not likely to follow the delocalization i mmediately: numerical analysis of the RRG problem suggests that the extende d states are multi-fractal at any finite disorder [2]. Moreover\, regular ( no disorder!) Josephson junction arrays (JJA) under the conditions that are feasible to implement and control experimentally demonstrate both MBL and non-ergodic behavior [3].\n\n1. D. Basko\, I. Aleiner\, and B. Altshuler\, Ann. Phys. 321\, 1126 (2006).\n2. A. De Luca\, B.L. Altshuler\, V.E. Kravt sov\, & A. Scardicchio\, PRL 113\, 046806\, (2014 LAST-MODIFIED:20151203T205941Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140220T153000Z DTEND:20140220T163000Z DTSTAMP:20260828T094430Z UID:fjnsikuehdd6ki2sfvvm48rhb8@google.com CLASS:PUBLIC CREATED:20140212T164337Z DESCRIPTION:Speaker: Ippei Danshita\, \n\nInstitution: Kyoto University\n\n Title: Quantum tricriticality and bright-like dark solitons in binary Bose mixtures in optical lattices\n\nAbstract: \nRecent experiments on ultracold atoms in optical lattices have observed quantum criticality accompanying t he second-order quantum phase transition between vacuum and superfluid\, pr oviding new opportunities for studying quantum criticality in optical-latti ce systems. Motivated by the experimental development\, we study quantum cr iticality near a tricritical point (TCP) in the two-component Bose-Hubbard model on square lattices. The existence of quantum TCP on a boundary of sup erfluid-insulator transition is confirmed by quantum Monte Carlo simulation s. Moreover\, we analytically derive the quantum tricritical scaling on the basis of an effective field theory. We find two significant features of th e quantum tricriticality\, that are its characteristic chemical potential d ependence of the superfluid transition temperature and a strong density flu ctuation. We also analyze soliton solutions of a superfluid state to find a bright-like dark soliton\, which has a non-vanishing density dip and no pi phase kink even in the case of a standing soliton. We suggest that these f eatures are directly observable in existing experimental setups of Bose-Bos e mixtures in optical lattices. \n\nHost: Charles Clark LAST-MODIFIED:20140212T164337Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141105T210000Z DTEND:20141105T220000Z DTSTAMP:20260828T094430Z UID:9a8ecrqho5o8qtnqu4me7vmke0@google.com CREATED:20141030T133727Z DESCRIPTION:Speaker Name: Tomo Tatsuno\n\nSpeaker Institution : University of Electro-Communications\, Tokyo\, Japan\n\nTime: Towards kinetic simulat ion of Magneto-rotational Instability using graphics processors\n\nAbstract : Magneto-rotational instability (MRI) is considered a feasible candidate for explaining turbulent accretion in astrophysical disks. It is shown by the fluid analyses with some kinetic effects included in the model [1\,2] t hat the pressure anisotropy brings an important effect on the accretion rat e. However\, the results depend on the free parameters in the terms for ki netic effects. Thus evaluation using fully kinetic simulation is desired f or quantitative estimate. We plan to make kinetic simulations of MRI using graphics processor units (GPUs) which are nowadays popular in scientific si mulations. There are plenty of codes available for fluid-type simulations\, but kinetic simulation codes are rare so far. In this talk\, I will descr ibe the problem and current status of our work in progress.\n[1] E. Quataer t et al.\, Astrophys. J. 577\, 524 (2002).\n[2] P. Sharma et al\, Astrophys . J. 637\, 952 (2006).\n\n\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/plasma-physics?hceid=bGJrNjYwYTc1Yjhqa DdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.9a8ecrqho5o8qtnqu4me7 vmke0&hs=121 LAST-MODIFIED:20141030T133727Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141021T171500Z DTEND:20141021T183000Z DTSTAMP:20260828T094430Z UID:p4kjjt34bs2hm2dsmfsapntpc4@google.com CREATED:20141010T195320Z DESCRIPTION:Speaker Name: Dr. Richard Remsing\n\nSpeaker Institution : Univ ersity of Pennsylvania\n\nTitle: Mapping the Collectie Response of Water t o Complex Surfaces with Local Molecular Field Theory\n\n\n\nJoin with Googl e Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/informal ?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNv bQ.p4kjjt34bs2hm2dsmfsapntpc4&hs=121 LAST-MODIFIED:20141010T195320Z LOCATION:Room 1116\, IPST Building\, Bldg. 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150318T193000Z DTEND:20150318T203000Z DTSTAMP:20260828T094430Z UID:ekafuhkcs3o86fro18ogkt62g4@google.com CREATED:20150313T150555Z DESCRIPTION:Speaker Name: Dr. Deepnarayan Gupta\n\nSpeaker Institution : HY PRES\n\nTitle : Superconductor Analog-to-Digital Converters for Digital Rad io Frequency Receivers\n\nAbstract : Complete modular and multi-function sy stems\, called digital-RF receivers\, are emerging as the first complex pro ducts incorporating superconductor integrated circuits. Superconductor inte grated circuits offer a combination of features to address a variety of hig h performance electronics applications\, ranging from high-performance and quantum computing to communications and other radio frequency (RF) systems. One of the most attractive applications is in the mixed-signal domain\, wh ere the advantage of quantum-accurate conversion between analog and digital domains can be effectively combined with those of high-speed\, low-power s ingle-flux-quantum digital circuits and high-quality analog circuits. Start ing with an overview of the superconductor integrated circuit technology an d single flux quantum logic\, this talk will describe various flavors of su perconductor analog-to-digital converters (ADCs) for radio frequency (RF) r eceivers and related applications.\n\n\nNotes: Please use the phone on the left hand side of the front door to call the receptionist for entry. LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS a nd overflow parking at the adjacent LTS building but not at the 4H building . LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts.\n LAST-MODIFIED:20150313T151303Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140410T173000Z DTEND:20140410T180000Z DTSTAMP:20260828T094430Z UID:tmfe91c1hahkon718v5ulkki8k@google.com CREATED:20140403T190425Z LAST-MODIFIED:20140403T190425Z LOCATION:Phys room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141114T213000Z DTEND:20141114T223000Z DTSTAMP:20260828T094430Z UID:mrhk4p5k4crqv7dcfanda65p2s@google.com CREATED:20141112T203440Z DESCRIPTION:​The Physics Lecture Demonstration Facility is looking for volu nteers for this year’s first Physics Discovery Days program​\,​ to be held on Saturday\, November 22 from 2 - 3:30pm. The theme is Fun With Electrici ty and Magnetism. If you can assist\, please email ​​​​lecdemo_outreach@phy sics.umd.edu ASAP.\n\nJoin with Google Hangouts: https://hangouts.google.co m/hangouts/_/physics.umd.edu/volunteers-for?hceid=bGJrNjYwYTc1YjhqaDdlazZqc jg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mrhk4p5k4crqv7dcfanda65p2s&hs =121 LAST-MODIFIED:20141112T205241Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Volunteers needed for 11/22 Outreach TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140113T200000Z DTEND:20140113T210000Z DTSTAMP:20260828T094430Z UID:egqbecmsvgkec5i45aur2935ns@google.com CLASS:PUBLIC CREATED:20140109T204039Z DESCRIPTION:Speaker: Eliot Kapit\n \nInstitution: Oxford University\n\nTit le:The Part is Greater than the Sum of the Wholes: How to Spin Light Into A nyons \n\nAbstract: Recent progress in microwave quantum optics and superco nducting qubits has made the creation of\nstrongly correlated--and even top ologically ordered--states of photons a real possibility. Many of these sta tes are gapped and exhibit anyon excitations\, which could be used for a ro bust form of quantum information processing. In this talk\, I present three key concepts necessary for generating a fractional quantum Hall state of p hotons in a superconducting qubit array. I first review how the\nexact lowe st Landau level of the continuum can be reconstructed in a lattice with lon ger ranged hopping beyond nearest neighbors. Following that\, I describe a proposal for implementing the complex hopping terms necessary to simulate a n artificial gauge field. Schemes of this type are not based on the quantiz ation of 2e and are thus free of charge noise effects. Finally\, I show tha t an\nauxiliary "shadow" lattice of qubits with a rapid decay rate can prot ect the quantum state of the primary quantum simulator through a form of pa ssive error correction\, holding it in or near the Laughlin state for arbit rarily long times without action from an external observer. All the\nmechan isms I describe here can be implemented with current technology\, suggestin g that fractional quantum Hall states of light could be within reach.\n LAST-MODIFIED:20140110T191539Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140127T200000Z DTEND:20140127T210000Z DTSTAMP:20260828T094430Z UID:7g3t8o5veqb95gsunbie62eqhs@google.com CLASS:PUBLIC CREATED:20140123T181408Z DESCRIPTION:Speaker: Shruti Puri\n\nInstitution: Stanford\n\nTitle: Semico nductor Quantum Dot Spin Based Quantum Computing Using Optically Excited Mi crocavity Exciton-Polaritons.\n\nAbstract: Quantum dots with optically con trolled spins known as QuDOS are promising candidates for large scale quant um computation. The complete ultrafast optical control of an electron spin in a charged quantum dot (QD) has been demonstrated [1]. However\, a two-qu bit operation\, which requires interaction between two neighboring spins is yet to be implemented. Recently\, a two-qubit gate based on dispersive int eraction in cavity QED system has been proposed [2]. The drawback of this s cheme is the high cooperativity factor required to reach error rates below the threshold for fault-tolerant operation. Another challenge is the fast\, high fidelity\, single-shot measurement of the qubit state. The current re adout schemes are either slow (such as the one based on QD molecules [3]) o r low fidelity (such as the one based on fluorescence from a pseudo-cycling transition in a single QD [4]).\n\nIn this talk\, I will discuss our recen t proposal for implementing single-qubit\, two-qubit gate [5] and quantum n on-demolition (QND) measurement [6] of the electron spins in site controlle d quantum dots\, using their Coulomb exchange interaction with optically ex cited exciton-polaritons in a nearby quantum well (QW) (see Fig. 1). The QD s are grown a few monolayers above the QW\, so that the QD electron wavefun ction has a non-negligible overlap with the QW polariton wavefuction. The r esulting spin-dependent Coulomb exchange interaction causes a shift in the resonance energies of QD electron and QW polariton. I will explain how thes e spin-dependent energy shifts can be exploited for fast and high fidelity qubit operations. \nReferences:\n[1] De Greve K\, et al. 2013 Reports on Pr ogress in Physics 76 (9)\, 092501.\n[2] Ladd TD and Yamamoto Y. 2011 Phys. Rev. B 84\, 235307.\n[3] Vamivakas A N\, et al. 2010 Nature 467 297.\n[4] D elteil A\, et al. 2013 arXiv:1310.8529.\n[5] Puri S and Yamamoto Y. 2012 Ph ys. Rev. B 85\, 241403(R).\n[6] Puri S\, McMahon PL\, and Yamamoto Y. 2013 arXiv:1310.4873.\n LAST-MODIFIED:20140124T151411Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150204T203000Z DTEND:20150204T213000Z DTSTAMP:20260828T094430Z UID:ojo8sbtgjlfarsb012gch8rin4@google.com CREATED:20150130T155234Z DESCRIPTION:Speaker Name: Dr. Jay Sau\n\nSpeaker Institution: UMCP\n\nTitle : Long-range anti-ferromagnetic interactions and near zero-energy states in magnetic impurities in superconductors\n\nAbstract: Magnetic impurities in superconductors are known to host sub-gap Yu-Shiba-Rusinov bound states th at have been observed in scanning tunneling microscopy (STM) experiments. I n the first part of this talk\, I will discuss how the presence of these YS R states modifies the interaction between the impurity spins [1]. The YSR s tates bound to the spins modify the interaction energy between the spins fr om the oscillating RRKY type to dominantly anti-ferromagnetic at distances larger than the fermi wave-length but small compared to the coherence lengt h. This provides a potentially interesting scenario where many quantum spin s can interact with each other through the superconductor to lead to intere sting ground states. In the second part of this talk we will discuss recent STM experiments involving multiple magnetic impurities where near zero-ene rgy states have been observed and interpreted to be Majorana modes. We will discuss a recent theoretical mechanism of how low energy YSR states can ap pear in complex magnetic impurities [2].\n\n[1] N. Y. Yao\, L. I. Glazman\, E. A. Demler\, M. D. Lukin\, J. D. Sau\, Phys. Rev. Lett. 113\, 087202 (2 014).\n\n[2] J. D Sau\, P. Brydon\, arXiv:1501.03149.\n\nNotes: For guests attending the LPS seminar\, please use the phone on the left hand side of t he front door to call the receptionist for entry. LPS is located at 8050 Gr eenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMC P shuttle route\; take #105 for the Courtyard Apts.\n\n\n LAST-MODIFIED:20150130T155234Z LOCATION:Lab for Physical Sciences downstairs conference room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150508T170000Z DTEND:20150508T180000Z DTSTAMP:20260828T094430Z UID:8buquf6vu2e80i7513esu675ig@google.com CREATED:20150424T192349Z DESCRIPTION:Speaker Name: Jun Liu \n\nSpeaker Institution : DuPont Experime ntal Station\n\nTitle : DuPont Activity in Developing High Voltage Cathodes for Li Ion Battery\n\nAbstract : Lithium ion batteries have revolutionized portable electronic devices in the past two decades\, and are primed to ma ke a great impact on transportation technology and green grid energy storag e. Accordingly\, this new application demands that lithium ion batteries of fer high energy and high power capabilities. One way to achieve higher ener gy and high power densities in Li ion batteries is to incorporate cathodes having significantly higher operational voltage. This approach is particula rly attractive for electric vehicle applications because fewer high voltage cells are needed in the battery packs used as power sources for the vehicl es. The assembly of the packs is simplified\, less hardware is required (fu rther increasing the system specific energy) and cost is lowered. However\, high voltage cathodes usually suffer from relatively poor cycling performa nce/rate capability. This presentation will focus on DuPont technical strat egies in choosing / developing / optimizing high voltage cathode systems.\n LAST-MODIFIED:20150424T192349Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150805T170000Z DTEND:20150805T183000Z DTSTAMP:20260828T094430Z UID:h47108le82bv33777pcm142qps@google.com CREATED:20150803T130355Z DESCRIPTION:\nSpeaker: Felipe J. Llanes-Estrada\, Universidad Complutense d e Madrid\n\nTitle: Great expectations at the LHC: unitarized effective theo ry and resonances\n\nAbstract: Global-flavor spontaneous symmetry breaking seems a common featureof hadron and of electroweak physics. The chiral Lagr angian then has a\ncounterpart in the Electroweak Symmetry Breaking Sector of the Standard Model\, except that there seem to be four "light" particles instead of three.\nMost of the parameter space for that effective Lagrangi an is strongly\ninteracting\, with the weakly-coupled Standard Model a fine -tuned case\, \nso one might expect strong interactions at the TeV scale or higher.\nUnitarizing the effective Lagrangian leads to various resonances\ , and\nI will compare those still compatible with LHC data with their\nequi valent ones in hadrons. LAST-MODIFIED:20150803T130355Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140930T163000Z DTEND:20140930T183000Z DTSTAMP:20260828T094430Z UID:n94hec7lp1bdur9osrei9qv2ag@google.com CREATED:20140729T140329Z DESCRIPTION:Joint Particle theory-experiment Maryland-Hopkins Seminar\n\nSe minar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm.\n\nTitle: Neutrinos: Recent Developments and Open Questions\n\nSpeaker: André de Gouvêa\, Northwestern University\n\nAbstract: Nonzero neutrino ma sses are the most concrete evidence of physics beyond the standard model to date. I will provide an overview of the current status of neutrino physics \, concentrating on recent experimental and theoretical developments. I wil l also discuss outstanding experimental and theoretical issues\, and the pr ogram that is required in order to fully explore the neutrino mass puzzle\, which ranges from precision neutrino oscillation searches to searches for charged-lepton flavor violation to the pursuit of a finite proton lifetime. \n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/phys ics.umd.edu/ept-joint?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2F sZW5kYXIuZ29vZ2xlLmNvbQ.n94hec7lp1bdur9osrei9qv2ag&hs=121 LAST-MODIFIED:20140915T202233Z LOCATION:PSC 3150\, University of Maryland SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Joint Seminar w/ Johns Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140220T183000Z DTEND:20140220T190000Z DTSTAMP:20260828T094430Z UID:8j31ahno3ffukt9lqiuatsg27g@google.com CREATED:20140205T020739Z LAST-MODIFIED:20140205T020755Z LOCATION:Phys room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T203000Z DTEND:20140512T213000Z DTSTAMP:20260828T094430Z UID:tb7k92b6hr4ht4pd0qp2b9408c@google.com CREATED:20140305T170258Z DESCRIPTION:Speaker Name: Nicolas Picot-Clemente\n\nSpeaker Institution : I PST\, University of Maryland\n\nTitle: Measurement of Galactic Cosmic-Ray H ydrogen and Helium Isotopes with BESS-Polar II\n\nAbstract: The Balloon-Bor ne Experiment with a Superconducting Spectrometer (BESS-Polar II) flew succ essfully over Antarctica during 24.5 days in December 2007 through January 2008 during a period of minimum solar activity. BESS-Polar II is configured with a solenoidal superconducting magnet and a suite of precision particle detectors. It can accurately identify hydrogen and helium isotopes among t he incoming cosmic-ray nuclei with energies from 0.2 up to about 1.5 GeV/n. The long duration of the flight\, and the good stability of the detectors\ , improved by a factor of 5 the number of cosmic-ray events previously reco rded with BESS-Polar I\, reaching about 4.7 billion collected particles. En ergy spectrum of cosmic-ray hydrogen and helium isotopes have been measured with the BESS-Polar II instrument with unprecedented accuracy. The isotope flux and secondary-to-primary ratio measurements provide important informa tion to better understand the propagation history of cosmic rays in the Gal axy. The results will be presented and compared to various propagation mode ls.\n\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM LAST-MODIFIED:20140430T204448Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150111T160000Z DTEND:20150111T170000Z DTSTAMP:20260828T094430Z UID:ijqmon48fmbm744pce7t4v6bdk@google.com CREATED:20150105T153405Z DESCRIPTION:Speaker Name: Multiple\n\nSpeaker Institution : Multiple\n\nTit le : GRAD-MAP Winter Workshop Final Student Presentations\n\nAbstract : The GRAD-MAP Winter Workshop students will present on their research projects\ , which cover a range of topics in physics and astronomy.\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koa ks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLm NvbQ.ijqmon48fmbm744pce7t4v6bdk&hs=121 LAST-MODIFIED:20150105T153612Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20140911T153000 DTEND;TZID=America/New_York:20140911T163000 RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH DTSTAMP:20260828T094430Z UID:sngrpl8avulr61r8h7a06698gs@google.com CREATED:20140915T152019Z DESCRIPTION:Speaker: Jim Gates and/or William Linch\, Physics\nAbstract: We begin describing the basic setup of supersymmetry and introduce the proble m of integration of superfields.\n\nJoin with Google Hangouts: https://hang outs.google.com/hangouts/_/physics.umd.edu/introduction-to?hceid=bGJrNjYwYT c1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.sngrpl8avulr61 r8h7a06698gs&hs=121 LAST-MODIFIED:20140915T152019Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to supersymmetry and integration in superspace TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150417T160000Z DTEND:20150417T170000Z DTSTAMP:20260828T094430Z UID:bsnviicf0i4qf0i502kokmk5o8@google.com CLASS:PUBLIC CREATED:20150413T135153Z DESCRIPTION:Speaker Name: Tyler Morgan-Wall\n\nSpeaker Institution: Johns Hopkins University\n \nTitle: Exploring Low Dimensions: Building Novel Supe rconducting Nanodevices to Probe New Physics\n\nAbstract: As nano-electron ics approach the 1-dimensional limit\, quantum effects begin to dominate th eir transport properties. These nano-electronics can be used to probe new s tates of matter as well as create novel devices. However\, reaching the siz e regime where quantum mechanical effects begin to appear is difficult usin g traditional fabrication techniques. I will present my work on a new metho d for fabricating devices small enough to probe these boundaries that uses only standard lithographic techniques and allows for precise control over t he final size of the nanodevice. In addition\, I will describe experimental evidence for Weber blockade\, a superconducting vortex dual to Coulomb blo ckade. When the width of a superconducting wire is on the order of the supe rconducting coherence length\, the wire effectively becomes a one-dimension al quantum dot for vortices. By tuning an external magnetic field and probi ng the critical current in a superconducting aluminum nanowire\, I will sho w how the entry and exit of a single vortex can be observed and controlled. Understanding and taking advantage of this effect can both lead to more ro bust small superconducting devices as well as enabling the creation of new devices based on manipulating individual flux quanta.\n\n​IMPORTANT NOTE- F ree Lunch served at 11:45 LAST-MODIFIED:20150415T182338Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141022T150000Z DTEND:20141022T160000Z DTSTAMP:20260828T094430Z UID:p1t61h5dkcn8corckf0laj5k9c@google.com CREATED:20141016T193741Z DESCRIPTION:Speaker Name: John Preskill \n\nSpeaker Institution: Caltech\n\ nTitle: Black Holes and Quantum Information\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjY wYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.p1t61h5dkcn 8corckf0laj5k9c&hs=121 LAST-MODIFIED:20141017T193922Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS (Quantum Information and Computer Science) / JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140929T200000Z DTEND:20140929T210000Z DTSTAMP:20260828T094430Z UID:dqgjmrbbg8d8sd2cg0jeoap448@google.com CREATED:20140922T154257Z DESCRIPTION:Speaker Name: Jim De Yoreo\n\nSpeaker Institution : Physical Sc iences Division\, Pacific Northwest National Lab\n\nTitle : The dynamics of matrix protein self-assembly and mineralization\n\nAbstract : Self-assembl y of organic matrices and subsequent directed nucleation of the mineral con stituents is a widespread paradigm in biomineral formation. The architectu re of the underlying matrix imposes order on the nucleating mineral species . For example\, in bone collagen monomers form into triple helices\, which then self assemble into well-organized fibrils. Within these fibrils high ly-oriented hydroxyapatite crystals nucleate and grow with a specific cryst al face in contact with the collagen fibrils. In order to understand the un derlying physical controls governing both matrix self-assembly and biomolec ule-directed crystallization\, we are using in situ AFM\, TEM and FTIR\, co mbined with molecular dynamics (MD) to investigate these processes.\nInvest igations into the assembly of extended protein structures formed from both collagen and microbial S-layer membrane proteins reveal the key role that i s played by conformational transformations in controlling the pathways and kinetics of assembly. The large barriers associated with these transformat ion renders them rate-limiting in forming the ordered structures. Conseque ntly\, before the ordered state can emerge\, these systems must be driven t o condense into metastable\, liquid-like clusters in which protein-protein contact times are large. The emergence of order within these clusters cata lyzes the further transformation and attachment of the monomeric proteins. In addition\, the pathway to the final ordered state can pass through tran sient\, less-ordered conformational states. Thus the concept of a folding funnel with kinetic traps often used to describe folding of individual prot eins is also useful in considering protein assembly. \nStudies of mineral n ucleation dynamics on alkyl thiol SAMs and collagen matrices are then used to show that these scaffolds promote nucleation through a reduction in inte rfacial energy. However\, nucleation of the amorphous phase in the calcium phosphate-on-collagen system is observed at supersaturations that are too l ow to be explained by classical nucleation theory (CNT). The existence of muti-ion complexes is shown to provide a low-barrier pathway to crystalliza tion that circumvents the large barriers predicted by CNT. Finally\, both AFM and TEM studies of matrix mineralization illustrate the strong control that ion-matrix binding has in defining the location of nucleation\, both t hrough its direct influence on interfacial energy and through sequestration of ions to build up the local concentration. Taken together\, these resul ts provide new insights into the mechanisms controlling biological crystall ization\, from formation of the initial matrix to the maturation of final c rystalline structures\n\n\n\nJoin with Google Hangouts: https://hangouts.go ogle.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg 0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.dqgjmrbbg8d8sd2cg0jeoap448&hs=1 21 LAST-MODIFIED:20140923T145538Z LOCATION:0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150924T163000Z DTEND:20150924T173000Z DTSTAMP:20260828T094430Z UID:7n5nf2a3d76u4l2giuo0472l4k@google.com CREATED:20150916T165630Z DESCRIPTION:Title: Optical and optomechanical response of visible frequency nanomaterials\nSpeaker: Amit Agrawal\, UMD / NIST Nanocenter LAST-MODIFIED:20150916T165630Z LOCATION: IREAP Conference Room (ERB 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150831T200000Z DTEND:20150831T210000Z DTSTAMP:20260828T094430Z UID:kn57n2ip1fe5ou910i82f58m2s@google.com CREATED:20150831T155950Z DESCRIPTION:Title : Generalizing Euclidean distance to understand polymer u ncrossing and knotting: A physicist’s foray into protein folding\nSpeaker N ame: Steven Plotking\, University of British Colombia\nAbstract : Physics o ften deals quite rightfully with symmetries and conservation laws\, while m olecular biology has historically retained little of this distinguished sta ndard. Even the simplest biological macromolecules are aperiodic\, have dis ordered energetics\, and have enormously vast phase space relevant at biolo gical temperatures. A central biophysical problem capturing all of these as pects is the question of how a protein\, once synthesized by a ribosome in the cell\, spontaneously folds up to it’s biologically functional structure . In this context\, equilibrium and non-equilibrium statistical mechanics\, as formulated in what has been called the energy landscape theory\, has be en essential in understanding protein folding\, function\, and evolution. U nfortunately however\, geometry\, structure\, and transformation often fade away into the ensemble of a statistical mechanical description. A fundamen tal problem which is nevertheless central to protein folding and structural comparison of biomolecules is the notion of what distance means for higher -dimensional objects such as a polymer. Here we generalize the notion of di stance between points to the distance between non-crossing space curves to uniquely define the Euclidean distance between two biopolymer conformations ([1-4]). We then tackle the conceptual and practical hurdles required to a pply this quantity to the problem of protein folding [5]\; we find that a s imple measure of distance\, with no adjustable parameters\, predicts foldin g rates with remarkable accuracy (a correlation of 0.95\; see Ref. [6]). We discuss the implications of this finding. LAST-MODIFIED:20150831T155950Z LOCATION:0112 CHM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150427T193000Z DTEND:20150427T203000Z DTSTAMP:20260828T094430Z UID:npgijsiripmi6ibbn0qdop7lkk@google.com CREATED:20150422T181047Z DESCRIPTION:Speaker Name: Samaresh Guchhait\n\nSpeaker Institution : The Un iversity of Texas at Austin\n\nTitle: Study of Complex Ordered Dynamics in Spatially Random Systems by SQUID Magnetometer\n\nAbstract : A random magn etic alloy with competing magnetic interactions (“frustration”) exhibits st rongly correlated behavior in phase space. This coherence is termed as “sp in glass\,” and the insights gleaned from its dynamics are applicable acros s a broad sweep of condensed matter. By a careful choice of spatial dimensi on and time scale\, one can prepare correlated regions that exhibit complex dynamical properties based on an “ultrametric” symmetry. Ultrametricity ca n be represented as a hierarchical tree-like structure\, with measureable b ranching characteristics. \n\nBecause spin glasses are non-linear dynamica l systems\, their properties depend strongly on the preparation of the init ial state. We have probed the dynamical properties of spin glasses prepared to provide explicit observation of the dynamical correlation length. Once measured\, we have used spatial and time domains to isolate ordered spin gl ass states. We have measured the hierarchical nature of the ultrametric tre e through the analysis of the dynamical susceptibility. Our proposed exper iments will explicitly measure the probability of branching\, and the branc hing ratio. That a completely random magnetic alloy can obey a structured p hase space geometry is a remarkable property of nature\, and an example of “order in randomness”.\n LAST-MODIFIED:20150422T181047Z LOCATION:Laboratory for Physical Sciences\, Room 1227 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150226T203000Z DTEND:20150226T220000Z DTSTAMP:20260828T094430Z UID:fsgoo0b0o6vp3k0ggqned8v0k8@google.com CREATED:20150211T164239Z DESCRIPTION:Speaker Name: Prof. Y. K. Lau\n\nSpeaker Institution: Institute of Applied Mathematics\, Chinese Academy of Mathematics and System Science \, Beijing\, China\n\nTitle: The enigmatic nature of time in quantum mechan ics\n\nAbstract: Single photon Sagnac interferometry as a probe to macrosco pic quantum mechanics is considered. It is shown that\, due to the asymmetr ic structure of the optical paths traversed by a single photon respectively in the clockwise and counter-clockwise direction within the ring cavity of a Sagnac interferometer\, the radiation\npressure force exerted by a photo n on a single macroscopic mirror within the cavity generates a linear super position of temporally separated quantum states of the mirror\, in contra st to the standard Schr\\"{o}dinger cat involving linear superposition of s patially separated quantum states defined at the same instant of time. Due to the optomechanical coupling of a single photon with a mirror within th e cavity\, the radiation pressure force mediates a transfer (swapping) of the which path entanglement of the photon to \nthe temporally (and not spat ially) separated quantum states of the mirror. Some fundamental issues re lated to the enigmatic nature of time in quantum theory and possible quantu m gravity theory raised by the present work are briefly touched upon.\n\n LAST-MODIFIED:20150211T190815Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint JQI / MCFP Quantum Foundation Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140930T171500Z DTEND:20140930T183000Z DTSTAMP:20260828T094430Z UID:8qgg2glois5kp0lmvbudblmsig@google.com CREATED:20140922T133108Z DESCRIPTION:Speaker Name: Professor Maria Cameron\n\nSpeaker Institution : UMCP\n\nTitle : Metastability\, Spectrum and Eigencurrents of the Lennard-J ones-38 Network\n\n\nJoin with Google Hangouts: https://hangouts.google.com /hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTB AZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.8qgg2glois5kp0lmvbudblmsig&hs=121 LAST-MODIFIED:20140922T133249Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151016T140000Z DTEND:20151016T170000Z DTSTAMP:20260828T094430Z UID:iqst60jhlihigj605di3r72e2s@google.com CREATED:20150921T194457Z DESCRIPTION:Theme: Bosons\, Fermions\, Cuprates\, and Silicon\n\n10:00 AM Stefan Natu "Spin-1 spin orbit coupled bosons in an optical lattice"\n\n1 0:45 AM Yang Song "New tunneling magnetoresistance and Silicon spin relax ation"\n\n11:30 AM Dmitry Efimkin "Moving solitons in a one-dimensional f ermionic superfluid"\n\n12:15 PM Zach Raines "Enhancement of superconduct ivity via periodic modulation in a three-dimensional model of cuprates"\n LAST-MODIFIED:20150921T194457Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151111T210000Z DTEND:20151111T220000Z DTSTAMP:20260828T094430Z UID:o9fol7433uk7gc3v9qlqjshvug@google.com CREATED:20151104T150750Z DESCRIPTION:Speaker Name: Dr. Carrie Black\n\nSpeaker Institution : NASA/Go ddard\n\nTitle : Self-Consistent Kinetic Modeling of Current Sheet Formatio n and Destruction by Reconnection \n\nAbstract : To a large extent\, space weather is due to a long chain of current sheet formation and destruction ( reconnection) events. Reconnection in the Sun’s corona is believed to be th e primary mechanism by which free magnetic energy is released explosively i n the form of a Solar Eruptive Event (a coronal mass ejection with accompan ying eruptive flare). This energy then couples to the Earth’s magnetosphere via reconnection at the magnetopause and finally is deposited in the atmos phere by reconnection at the tail. Therefore\, understanding the mechanisms for current sheet formation and destruction in detail is essential for mak ing progress in understanding space and laboratory plasmas. The major chall enge\, however\, is that these mechanisms intrinsically involve the couplin g of the global scale where the free energy is generated to the kinetic sca le where the energy is released. To understand this multi-scale coupling\, we must model both the global-scale current sheet for! mation process and t he resulting kinetic-scale reconnection. For the first time we have simulat ed this process rigorously using a fully kinetic code\, in which the bounda ry drivers robustly capture the effect of the global driving\, especially t he driving expected in the Sun’s corona. I will discuss the key physical di fferences between modeling this coupling by the MHD approximation versus th e physically accurate kinetic approach. Major issues arise as to how to tre at correctly the electric currents generated by the global motions. These a re only grossly approximated in the MHD approach. I will show three configu rations driven by shearing\, including a reconnecting system. This work pro vides ground truth for all modeling of magnetic reconnection in space and l aboratory plasmas. LAST-MODIFIED:20151104T150750Z LOCATION:Kim Building Pepco Room\, 1105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140206T173000Z DTEND:20140206T183000Z DTSTAMP:20260828T094430Z UID:5rp23cdb581hjij667oavnar28@google.com CREATED:20140131T144631Z DESCRIPTION:Title : Rogue Wave Statistics in the Ocean and Beyond\n\nSpeake r Name: Prof. Lev Kaplan\n\nSpeaker Institution : Tulane University\n\nAbst ract : I will discuss several examples of wave dynamics in which the wave s tatistics may be analyzed from the viewpoint of random\, weak semiclassical scattering. (i) Imaging of electron flow in a two-dimensional electron gas exhibits branched behavior\, which is associated with caustics in the clas sical dynamics. The statistical properties of these branches may be compute d in the limit where the random potential associated with impurities is wea k and is correlated on a scale large compared with the wavelength. (ii) A r elated approach is applied to calculate the formation probability of rogue waves in the ocean\, due to refraction by weak random currents. When the wa ve steepness is small\, the probability distribution is governed by a singl e “freak index” parameter\, which describes the strength of (linear) wave s cattering by random currents relative to the angular spread of the incoming random sea. When the average steepness is large\, the wave height distribu tion takes a very similar functional form\, but the key variables determini ng the probability distribution are the steepness\, and the angular and fre quency spread of the incoming waves. (iii) A quasi-two-dimensional microwav e resonator with correlated disorder has been used to demonstrate the mecha nism of rogue wave formation by linear refraction in the laboratory. Large deviations from Rayleigh’s law for the wave height distribution are associa ted with “hot spots”\, which again may be interpreted as remnants of singul arities in the ray dynamics.\n LAST-MODIFIED:20140131T144631Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140922T190000Z DTEND:20140922T203000Z DTSTAMP:20260828T094430Z UID:mqrpe6ko98uoes25f4jvmfkuq8@google.com CREATED:20140813T183841Z DESCRIPTION:Speaker: Gilly Elor\n\nSpeaker Institution: MIT\n\nTitle: Bubbl e Baryogenesis\n\nAbstract: I will discuss an alternative mechanism of bary ogenesis in which a scalar baryon undergoes a percolating first-order phase transition in the early Universe. The potential barrier that divides the p hases contains explicit B and CP violation and the corresponding instanton that mediates decay is therefore asymmetric. The nucleation and growth of t hese asymmetric bubbles dynamically generates baryons\, which thermalize af ter percolation\; bubble collision dynamics can also add to the asymmetry y ield. I will present an explicit toy model that undergoes bubble baryogenes is\, and discuss the numerical simulation of the evolution of the baryon as ymmetry through bubble nucleation and growth\, bubble collisions\, and wash out. Finally I will discuss ongoing work to construct more realistic models \, for instance in which the scalar baryon and its potential arise amongst the color-breaking minima of the MSSM\, or in the supersymmetric neutrino s eesaw mechanism. \n\nJoin with Google Hangouts: https://hangouts.google.com /hangouts/_/physics.umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0a mZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mqrpe6ko98uoes25f4jvmfkuq8&hs=121 LAST-MODIFIED:20140911T175723Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150505T200000Z DTEND:20150505T210000Z DTSTAMP:20260828T094430Z UID:83hmmafme24gt3fo2m1sg0o918@google.com CREATED:20150427T151332Z DESCRIPTION:Speaker Name: Sam Krucker\n\nSpeaker Institution: Berkeley\n\ nTitle: "Hard X-ray Observations as Diagnostics of Particle Acceleration i n Solar \nFlares "\n\nAbstract: Solar flares are powered by an impulsive r elease of magnetic energy stored\nin the solar atmosphere. The release of m agnetic energy is heating coronal plasma\, but as much as half of the relea sed energy goes into particle acceleration. The acceleration mechanisms tha t provide these efficient conversions of\nmagnetic energy into supra-therma l particles are currently not well understood.\nIn the past years however\, significant progress has been made on the\nobservational side\; thanks in particular to hard X-ray observations by Reuven Ramaty High Energy Spectros copic Imager (RHESSI)\, a NASA small explorer mission. After an extensive i ntroduction\, I will review recent observational\nresults obtained by RHESS I. Furthermore\, I will briefly describe future\ninstrumentation such as th e hard X-ray instrument STIX on board ESA’s Solar\nOrbiter mission and a so unding rocket experiment called FOXSI that successfully\nused hard X-ray fo cusing optics for solar observations.\n\n\n\n\n\n\n\n\n LAST-MODIFIED:20150427T151332Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151119T173000Z DTEND:20151119T183000Z DTSTAMP:20260828T094430Z UID:sehnngibn3hrtm7fl5tgiclp28@google.com CREATED:20151001T185351Z DESCRIPTION:Insects in a Changing World: Modeling Insect Populations In the Context of Climate and Land-Use Change\nDr. Sharon Bewick\nUniversity of M aryland\, Department of Biology LAST-MODIFIED:20151001T185351Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140122T160000Z DTEND:20140122T170000Z DTSTAMP:20260828T094430Z UID:sf41um6pq9j6ei4tatlf334f34@google.com CLASS:PUBLIC CREATED:20140115T135713Z DESCRIPTION:Speaker: Ofer Firstenberg\n\nInstitution: Harvard\n\nTitle:Quan tum nonlinear optics with Rydberg polaritons\n\nAbstract:\nRealizing and en gineering optical non-linearity at the level of single photons is a goal of scientific and technological significance. We obtain strong interactions b etween propagating photons by coherently coupling them to Rydberg atoms in a cold gas. While slowly traversing the medium\, the "Rydberg polaritons” i nteract via the Van-der-Waals force\, owing to their large electric dipole- moment. We are able to vary the dynamics of the two-photon wavefunction fro m dispersive (Schrodinger-like) to dissipative (diffusion-like) and observe strong bunching\, anti-bunching\, and a conditional phase-shifts of 1 radi an for two individual photons. \n\nHost: Alexey Gorshkov LAST-MODIFIED:20140115T135713Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150211T180000Z DTEND:20150211T193000Z DTSTAMP:20260828T094430Z UID:o2mu6usr58o2g5t28atjn7tbkg@google.com CREATED:20150126T140731Z DESCRIPTION:Speaker Name: Thomas Schaefer\n\nSpeaker Institution: North Ca rolina State University\n\nTitle: Fluid dynamics and effective (field?) the ory\n\nAbstract: The modern understanding of fluid dynamics is based on the idea that theory is an effective long-distance description of any many-bod y system at finite temperature. I will try to make this notion more precise \, focusing on the example of a scale invariant non-relativistic\nfluid. LAST-MODIFIED:20150205T205951Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140325T180000Z DTEND:20140325T193000Z DTSTAMP:20260828T094430Z UID:1sf9h5qshca1nretdpoqjn9in0@google.com CREATED:20140324T132102Z DESCRIPTION:Speaker Name: Michael Sokoloff\n\nSpeaker Institution : Univers ity of Cincinnati\n\nTitle: "Particle-antiparticle Oscillation and CP viol ation in the Neutral Charm Meson System"\n\nEdits: Please note that this ta lk is on an unusual day\, TUESDAY\, March 25.\n LAST-MODIFIED:20140324T132102Z LOCATION:PSC room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160204T173000Z DTEND:20160204T183000Z DTSTAMP:20260828T094430Z UID:jmc2k7feldl71hhh0i3bt5uep8@google.com CREATED:20160127T184451Z DESCRIPTION:Speaker: Dan Lathrop and Ed Ott\, University of Maryland\n\nTit le: Nonlinear Dynamics of a plucked string\n \nAbstract: The problem of the dynamics of an elastic string under tension was first addressed analytical ly over 300 years ago and is a standard topic in virtually all undergraduat e physics textbooks on mechanics or waves. Notably\, however\, as opposed t o the linear case of small amplitude dynamics\, the nonlinear dynamics of s trings under tension is surprisingly rich and has not been well-studied\, p articularly experimentally (the latter is presumably due to the general per ception of the problem as a closed subject). In this talk we report on prel iminary results reexamining the nonlinear dynamics of strings. The talk wil l be divided into two parts: Part I\, presented by Dan Lathrop\, will focus on his motivation for initiating the experimental study (reconnection of s uperfluid vortices)\, and preliminary experimental findings obtained so far . Part II\, presented by Ed Ott\, will discuss analysis\, testable predicti ons for the experiments\, and open questions. We acknowledge Remi Boros\, M ara Mishner\, Tom Antonsen\, and Stuart Antman for their part in this resea rch. LAST-MODIFIED:20160203T142359Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160407T170000Z DTEND:20160407T180000Z DTSTAMP:20260828T094430Z UID:7s55r3nt9t88sk6p5jsm2eh9kg@google.com CREATED:20160404T194801Z DESCRIPTION:Speaker: Artan Sheshmani (Ohio State University) - https://peop le.math.osu.edu/sheshmani.1/Welcome.html\nAbstract: I will talk about deri vation of an explicit formula for the generating function of all DT invaria nts counting "vertical" two dimensional sheaves on K3 fibrations. The final expressions will be shown to satisfy strong modularity properties. In part icular I will talk about a new construction of vector valued modular forms which emerges from the geometric framework\, exhibiting some of the feature s of a Hecke transform. This is joint work with Vincent Bouchard\, Thomas C reutzig\, Emanuel Diaconescu\, Charles Doran and Callum Quigley. LAST-MODIFIED:20160404T194801Z LOCATION:Math 1311 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Vertical DT invariants and modular forms (note special time and pla ce --- combined with Algebra Seminar) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151105T190000Z DTEND:20151105T200000Z DTSTAMP:20260828T094430Z UID:9kpnq51uk2di1rq3c23oova4to@google.com CREATED:20151029T144208Z DESCRIPTION:Speaker Name: Francios Amet\n\nSpeaker Institution: Appalchia n State\n\nTitle: Superconductivity in the quantum Hall regime.\n\nAbstract : Combining superconductivity and the quantum Hall (QH) effect is a promisi ng route for creating new types of topological excitations. Despite this po tential\, signatures of superconductivity in the quantum Hall regime remain scarce\, and a superconducting current through a quantum Hall weak link ha s so far eluded experimental observation. Indeed\, contrary to the case of topological insulators\, the magnetic field in the QH regime breaks time-re versal symmetry\, which is essential for s-wave pairing of conventional sup erconductors. Nonetheless\, we observe a robust supercurrent in the quantum Hall regime\, in graphene encapsulated in boron nitride. The electronic qu ality of these heterostructures results in a robust Landau quantization at low fields\, which makes them particularly suitable to engineer QH/supercon ductor hybrids.I will discuss the role of the superconducting interface\, e dge states\, and Andreev bound states in observation of the Josephson effec t through a QH region.\n\nHOST: James Williams LAST-MODIFIED:20151029T182604Z LOCATION:room 1201 John S. Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Francios Amet\, Appalachian State TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140326T193000Z DTEND:20140326T203000Z DTSTAMP:20260828T094430Z UID:flobnik896i5u464v7fvrgf70s@google.com CREATED:20140325T132918Z DESCRIPTION:Speaker: Irfan Siddiqi\n\nAffiliation: Quantum Nano-electronic s Laboratory\, UC Berkeley\n\nTitle: Taking Control of Coherent Supercondu cting Quantum Electronics\n\nAbstract:Electronic circuits which exhibit qua ntum mechanical phenomena—superposition and entanglement\, in particular—pr omise a new generation of computers capable of solving currently intractabl e problems\, secure communication\, precision metrology\, detectors with un paralleled sensitivity\, and an efficient route for synthesizing new materi als. One of the fundamental challenges\, however\, in quantum circuitry is to sustain coherence over a time interval practical for performing a comput ation. Until now\, boosting coherence has involved hardware development to minimize coupling to a dissipative environment which typically transforms a quantum superposition into a classical state. Recent advances in the deve lopment of robust quantum-noise-limited microwave amplifiers and quantum bi ts with lifetimes in excess of 100 microseconds have enabled the use of fee dback to actively suppress decoherence. In particular\, we have been able t o tailor the dissipative environment\, either via measurement or excitation pulses\, to stabilize quantum superposition states and coherent oscillatio ns as well as track the evolution of single and two qubit states. These adv ances in precision measurement and control are key for implementing practic al quantum circuits. \n\n(refreshments available at 3:00) LAST-MODIFIED:20140325T132918Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160309T160000Z DTEND:20160309T170000Z DTSTAMP:20260828T094430Z UID:e3d5s7iogcuj8vghpi0f17n4po@google.com CREATED:20160114T190237Z DESCRIPTION:Speaker: David Gross\n\nSpeaker Affiliation: Cologne\n\nTitle: Compressed Sensing and QM: Recent Progress and State of the Art\n\nAbstract : Every time the release button of a digital camera is pressed\, several me gabytes of raw data are recorded. But the size of a typical jpeg output fil e is only 10% of that. What a waste! Can't we design a process which record s only the relevant 10% of the data to begin with? \nCompressed sensing is a young theory that achieves this trick for certain signals. There has been a fruitful exchange of ideas between this field and quantum physics: Mathe matical methods from quantum information have found many applications in cl assical compressed data acquisition tasks. Conversely\, compressed sensing ideas have advanced the theory of quantum state estimation. I will introduc e the basics of the theory and outline where we stand with regards to quant um tomography applications. I will mention very recent results in uncertain ty quantification\, as well as applications of the diamond norm and the Cli fford group in compressed sensing.\n LAST-MODIFIED:20160229T195037Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150208T000000Z DTEND:20150208T013000Z DTSTAMP:20260828T094430Z UID:kvugqpaqh3qfnkm642vfb30k1s@google.com CREATED:20150206T172018Z LAST-MODIFIED:20150206T172018Z LOCATION:1410 John S. Toll Physics Building\, University of Maryland SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120208T163000 DTEND;TZID=America/New_York:20120208T173000 RRULE:FREQ=WEEKLY;UNTIL=20120502T203000Z;BYDAY=WE DTSTAMP:20260828T094430Z UID:qqh7094qblgcklemfaoh9cedeg@google.com CREATED:20120208T144817Z DESCRIPTION:This is the seminar for second semester graduate students and i t is taught by A. Hassan and L. A. Orozco in the Spring 2012 LAST-MODIFIED:20120208T144826Z LOCATION:1305 F conference room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Frontiers and Foundations of Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140203T200000Z DTEND:20140203T210000Z DTSTAMP:20260828T094430Z UID:ftu3g8ql0pijo1tq7r0g6bkp9s@google.com CREATED:20140116T164851Z DESCRIPTION:Title: WIMPs and UnNaturalness\n\nSpeaker: Luca Vecchi\, UMD\n\ nAbstract: Generic extensions of the Standard Model that respect baryon and lepton numbers have accidentally stable particles. The most studied exampl e is the neutralino in the MSSM with R-parity\, but analogous candidates ca n be found in scenarios with warped extra dimensions. Avoiding over-closure of the Universe in many theories aiming to solve the hierarchy problem may thus require some amount of tuning of the weak scale\, hinting at a possib le connection between WIMP dark matter and unnaturalness. Dark matter direc t detection is a very efficient probe of these unnatural models. We discuss the signatures of a generic gauge-singlet WIMP.\n\n\n LAST-MODIFIED:20140130T175129Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140128T160000Z DTEND:20140128T173000Z DTSTAMP:20260828T094430Z UID:0gaafbbov2rbhqd2tjqmcccvr4@google.com CREATED:20140114T154528Z DESCRIPTION:Speaker: Xin Liu (Penn State)\n\nTitle: Theory of Proximity In duced Triplet Superconductivity in Spin-orbit-coupled Systems\n\nAbstract: The observation of long range proximity effect in a superconductor/ferromag net junction is\, at first\, surprising because superconductivity with spin singlet Cooper pairs is incompatible with Zeeman spin splitting induced by ferromagnetic order. This has given rise to suggestions that the induced s uperconductivity is of spin triplet character. Because spin-orbit coupling can also lift spin degeneracy\, it is natural to ask what is the nature of proximity induced superconductivity in a material with strong spin-orbit co upling.\n\nHere\, we study proximity induced triplet superconductivity in a spin-orbit-coupled system\, and show that the d-vector of the induced trip let superconductivity undergoes precession that can be controlled by varyin g the relative strengths of Rashba and Dresselhaus spin-orbit couplings. In particular\, a long range triplet-helix mode is predicted when the two spi n-orbit couplings have equal strengths. We also study the Josephson junctio n geometry and show that a transition between 0- and pi- junctions can be i nduced by controlling the spin-orbit coupling with a gate voltage. An exper imental setup is proposed to verify these effects. Conversely\, the observa tion of these effects can serve as a direct confirmation of triplet nature of superconductivity.\n\nHost: Sriram Ganeshan\n\nhttp://www.physics.umd.e du/cmtc/seminars.html LAST-MODIFIED:20140114T154627Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151118T200000Z DTEND:20151118T210000Z DTSTAMP:20260828T094430Z UID:p78b25tisegkcje9uilcpmecso@google.com CREATED:20151102T180834Z DESCRIPTION:Speaker Name: Prof. Peter T. Rakich \n\nSpeaker Institution : Y ale University\n\nTitle: Mixing light and sound in nanophotonic circuits\n \nAbstract : We explore the physics and applications of traveling-wave phot on-phonon coupling in a range of new optomechanical structures. These trave ling-wave interactions\, often termed Brillouin interactions\, are the basi s for tailorable forms of signal amplification\, high performance lasers\, and a host of hybrid photonic-phononic signal processing applications. The ability to harness and shape such interactions on-chip has given rise power ful new technologies ranging from ultra-low noise microwave oscillators\, t o chip-scale gyros\, to frequency agile microwave photonic filtering techno logies\; this nascent field\, termed “Integrated Brillouin Photonics”\, rep resents an unique intersection between Optomechanics\, Nonlinear Optics\, a nd Microwave Photonics. \n\nWe describe recent progress towards the develop ment of silicon-based Brillouin Photonics. Using new strategies to confine both acoustic phonons and photons in hybrid photonic-phononic guided-wave s tructures we cre! ate artificial forms Brillouin nonlinearity. Harnessing t hese interactions\, we demonstrate efficient amplification of light and con trollable phonon emission. Building on this physics\, we engineer new proce ssing schemes based on optically addressable phonon emitters and receivers in silicon. Beyond Brillouin in silicon\, we will discuss new concepts for the enhancement of photon-phonon interactions by manipulating phonon dissip ation and transductive properties of materials. \n LAST-MODIFIED:20151102T181023Z LOCATION:Laboratory for Physical Science SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140310T200000Z DTEND:20140310T213000Z DTSTAMP:20260828T094430Z UID:s0su053js00vt460j3mmij6kt4@google.com CREATED:20140304T183903Z DESCRIPTION:Speaker Name: Irene Chen\n\nSpeaker Institution : UC Santa Barb ara\n\nTitle: RNA evolution in early life.\n\nAbstract: The origin of life is believed to have progressed through an RNA World\, in which RNA acted as both genetic material and functional molecules. I will describe our work t oward mapping complete evolutionary fitness landscapes and lessons on the r ole of natural selection and historical accidents in early evolution. I wil l also describe our work on the emergence\, survival\, and spread of evolut ionary innovations during the origin of life.\n\nNotes: *Refreshments at 3: 45pm\n\nFor further information contact: Dr. Wolfgang Losert\, Coordinator\ n LAST-MODIFIED:20140307T154551Z LOCATION:0112 Chemistry Bldg. (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140925T173000Z DTEND:20140925T180000Z DTSTAMP:20260828T094430Z UID:03jakmogqtgdp3v8tumqslh9f4@google.com CREATED:20140828T212037Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.03jakmogqtgdp3v8tumqslh9f4&hs=121 LAST-MODIFIED:20140828T212051Z LOCATION:phys room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for the CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150302T210000Z DTEND:20150302T223000Z DTSTAMP:20260828T094430Z UID:temd256h3s2mgn0a7r45uak8n4@google.com CREATED:20150216T142049Z DESCRIPTION:Speaker Name: Raffaele Tito D'Agnolo\n\nSpeaker Institution: I AS\n\nTitle: New avenues to baryogenesis and thermal freeze-out in light da rk matter models\n\nAbstract: In the first part of the talk I will discuss a new way of transferring an asymmetry between two sectors through number c onserving interactions. This method does not require thermal contact betwee n the two sectors and allows for successful baryogenesis in models with arb itrarily light asymmetric dark matter.\nIn the second part of the talk I wi ll review two known exceptions to the calculation of relic densities (coann ihilation and forbidden channel annihilation) and apply them to sub GeV dar k matter candidates. The extension to smaller masses opens up the possibili ty of generating exponential hierarchies between the cross section relevant to the relic density and those responsible for signals today.\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ep t-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29 vZ2xlLmNvbQ.temd256h3s2mgn0a7r45uak8n4&hs=121 LAST-MODIFIED:20150227T165257Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20140306T150000 DTEND;TZID=America/New_York:20140306T160000 RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH EXDATE;TZID=America/New_York:20140306T150000 DTSTAMP:20260828T094430Z UID:a94qpqt0limpc3kfvlhmvas938@google.com CREATED:20140311T172130Z DESCRIPTION:Speaker: Sungwoo Hong (UMCP) LAST-MODIFIED:20140311T172130Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151216T160000Z DTEND:20151216T170000Z DTSTAMP:20260828T094430Z UID:19hljf44ll8accpvk5um5hn7jc@google.com CREATED:20151030T142345Z DESCRIPTION:Speaker: Shaun Maguire\n\nSpeaker Institution: Caltech\n\nTitle : Indra's wormholes: a mathematical tour of multiboundary wormholes and the ir entanglement structure\n\nAbstract: Over the past decade\, it has become increasingly clear that there are deep connections between high energy phy sics and quantum information\, with entanglement serving as a bridge. The R yu-Takayanagi conjecture is one of the seminal results which translates que stions about the entanglement entropy of a CFT state to the task of calcula ting the lengths of minimal geodesics. These computations are especially tr actable for 1+1d CFTs\, where there are a variety of additional symmetries. These states are dual to 2+1d solutions of Einstein's equations via the Ad S/CFT correspondence\, but we will not go into much detail about this in th is talk. Instead\, we will provide an overview of these connections as they are relevant to quantum information theorists. More specifically\, we will outline some of the surprising aspects of entanglement entropy in this fam ily of states and what is known about how they are described by MERAs. This talk will include many computer-generated images. LAST-MODIFIED:20151210T162348Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131122T160000Z DTEND:20131122T170000Z DTSTAMP:20260828T094430Z UID:qoe7cqv0rq1ro112kde18megqo@google.com CLASS:PUBLIC CREATED:20131122T133735Z DESCRIPTION:Speaker: Nick Hutzler\, Harvard University\n\nTitle: A New Limi t on the Electron Electric Dipole Moment\nAbstract:\nThe electron is expect ed to have an electric dipole moment (d_e)\, though it has so far eluded ex perimental observation. While\nthe Standard Model's prediction for d_e is s till far beyond any foreseeable experiment\, new physical theories (especia lly\nSupersymmetry) predict values for d_e that are near the experimental u pper limit. The ACME Collaboration recently performed a search for\nd_e via a precision spin precession measurement in a beam of polar ThO molecules [ arXiv:1310.7534]. Our measurement did not see any\nevidence for a non-zero d_e\, but we did set the limit |d_e| < 8.7*10^-29 e*cm. This represents an order of magnitude improvement\nover the previous best limit\, and places t ighter restrictions on new physics beyond the Standard Model.\n LAST-MODIFIED:20131122T133735Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special AMO Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141006T150000Z DTEND:20141006T160000Z DTSTAMP:20260828T094430Z UID:0rmgdj3iu9drv79i5lfn825u9o@google.com CREATED:20140711T171359Z DESCRIPTION:Speaker Name: Gregory Fuchs\n\nSpeaker Institution: Cornell\n\ nTitle: Coherent control over diamond nitrogen-vacancy center spins with a mechanical resonator\n\nAbstract: We demonstrate coherent Rabi oscillatio ns of diamond nitrogen-vacancy (NV) center spins driven by a mechanical res onator without mediation by a magnetic driving field [1\, 2]. Using a bulk -mode acoustic resonator fabricated from single crystal diamond\, we exert non-axial ac stress on NV centers positioned at an antinode of a gigahertz frequency mechanical mode. When the ms = –1 to +1 spin state splitting ene rgy is tuned into resonance with a driven mechanical mode\, we observe Δms = ±2 spin transitions\, which are forbidden by the magnetic dipole selectio n rule. To rule out stray electric and magnetic fields as the origin of th ese spin transitions\, we study the spin signal as a function depth within the diamond resonator. We find that the spin signal reproduces the periodi city of the acoustic standing wave\, confirming the mechanical origin of th e spin resonance. Furthermore\, we examine the coherence of mechanically controlled NV center qubits and compare it to the coherence of magnetically controlled spin qubits in the NV center ground state spin manifold. This work demonstrates direct and coherent coupling between NV center spins and resonator phonons\, which has potential for high frequency strain sensing\, fundamental research into spin-phonon interactions at the nanoscale\, and as a platform for hybrid spin-mechanical quantum systems.\n\nHost: Jimmy Wi lliams\n\n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hang outs/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZT BAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.0rmgdj3iu9drv79i5lfn825u9o&hs=121 LAST-MODIFIED:20140925T192510Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130905T173000Z DTEND:20130905T180000Z DTSTAMP:20260828T094430Z UID:pvm3rvnt7sdsme6lcpip6nmbk4@google.com CREATED:20130904T180850Z LAST-MODIFIED:20130904T181033Z LOCATION:room 1350\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140210T183000Z DTEND:20140210T193000Z DTSTAMP:20260828T094430Z UID:cf6dpgooukc3u0tfdlilgkdepo@google.com CREATED:20140129T214820Z DESCRIPTION:Title: How to calculate partonic contribution to the proton spi n in lattice QCD\n\nSpeaker: Yong Zhao\, UMD\n\nAbstract: In this talk\, I will discuss how we can construct the proton spin in terms of the spin and orbital angular momentum carried by free quarks and gluons in Feynman’s par ton language. Their individual contributions are related to the matrix elem ents of gauge-invariant\, nonlocal Euclidean operators through perturbative matching conditions\, which will be useful for lattice QCD calculation of these quantities. I will present the results of the matrix elements and exp lain how the matching procedure works at one loop level. Finally\, I will d iscuss the future calculations of matching to lattice matrix elements in or der to precipitate a lattice QCD determination of the proton spin compositi on. LAST-MODIFIED:20140205T161905Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160323T170000Z DTEND:20160323T180000Z DTSTAMP:20260828T094430Z UID:ofvfo57lhtgnk5kukmlc5badt4@google.com CREATED:20160310T130514Z DESCRIPTION:Francesca Ferlaino\, University of Innsbruck\n\nThe Fascination of Lanthanides for Ultracold Quantum Physics\n\nGiven their strong magneti c moment and exotic electronic configuration\, lanthanide atomic species di sclose a plethora of intriguing phenomena in ultracold quantum physics. The large magnetic moment of these atoms reflects on a strong interparticle di pole-dipole interaction\, which has both a long-range nature and an isotrop ic character. Here\, we report on our latest results on quantum many-body a nd few-body physics based on a strongly-magnetic lanthanide\, erbium (Er). Particular emphasis will be given to the scattering properties of bosonic a nd fermionic Er\, in which unconventional and fascinating phenomena appear as a result of both the magnetic and the orbital anisotropy of the underlyi ng the native interactions between atoms. LAST-MODIFIED:20160310T161228Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150522T160000Z DTEND:20150522T170000Z DTSTAMP:20260828T094430Z UID:gdslvsskh9lciflk20j1g7p32g@google.com CLASS:PUBLIC CREATED:20150515T122045Z DESCRIPTION:​IMPORTANT NOTE- Free Lunch served at 11:45 \n\nSpeaker- Dongl ing Deng\, JQI\n \nTitle- Probe knots and Hopf insulators with ultracold at oms\n\nAbstract- Knots and links are fascinating and intricate topological objects that have played a prominent role in physical and life sciences. T heir influence spans from DNA and molecular chemistry to vortices in superf luid helium\, defects in liquid crystals and cosmic strings in the early un iverse. Here\, we show that knotted structures also exist in a peculiar cla ss of three dimensional topological insulators---the Hopf insulators. In pa rticular\, we demonstrate that the spin textures of Hopf insulators in mome ntum space are twisted in a nontrivial way\, which implies various knot and link structures. We further illustrate that the knots and nontrivial spin textures can be probed via standard time-of-flight images in cold atoms as preimage contours of spin orientations in stereographic coordinates. The ex tracted Hopf invariants\, knots\, and links are validated to be robust to t ypical experimental imperfections. Our work establishes the existence of kn otted structures in cold atoms and may have potential applications in spint ronics and quantum information processings.\n LAST-MODIFIED:20150515T122045Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121022T203000Z DTEND:20121022T213000Z DTSTAMP:20260828T094430Z UID:iof0lovk60fv92apka9etq00ns@google.com CREATED:20121019T135154Z DESCRIPTION:Speaker: Jan Sengers \n Institute f or Physical Science and Technology\, UMCP\n \nTopic: Thermal Flu ctuations in Fluids on Earth and in Space. LAST-MODIFIED:20121019T135200Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141107T174500Z DTEND:20141107T181500Z DTSTAMP:20260828T094430Z UID:03nnok25a6vtq1c7d0nqp93gr8@google.com CREATED:20141103T150412Z DESCRIPTION:Speaker: David Hucul\n\nTitle: Modular Quantum Information Proc essing\n\nAbstract: Trapped ions are qubit standards in quantum information science because of their long coherence times and high fidelity entangling gates controlled with external fields. Scaling to very large dimensions ma y require the use of a modular architecture where trapped ions in separate ion trap modules are entangled using a photonic interface while ions in the same module are entangled using a phonon bus. We report the successful com bination of these types of entanglement within and between two modules. We use fast optics to generate heralded remote entanglement between modules at rates exceeding 4 per second\, faster than the experimentally measured dec oherence rate of the remote entangled state. The resource scaling in such a modular architecture is super-exponential in the ratio of the mean remote entanglement time to the entangled qubit coherence time\, and trapped ions are the only experimental system to date where this ratio is small and the overhead is not forbidding.\n\nModular quantum networks may involve the use of different types of qubits to create a large scale network. Heralded ent anglement between qubits using photon interference is a powerful tool to cr eate entanglement within heterogeneous quantum systems. We experimentally d emonstrate the entanglement of non-identical qubits by interfering distingu ishable photons emitted from distinguishable trapped ions without significa nt loss of remote entanglement rate or fidelity. \n\nImportant note: Free l unch served right before the talk!\n\n\n\nJoin with Google Hangouts: https: //hangouts.google.com/hangouts/_/physics.umd.edu/jqi-friday?hceid=bGJrNjYwY Tc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.03nnok25a6vtq 1c7d0nqp93gr8&hs=121 LAST-MODIFIED:20141103T150412Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Friday Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150324T183000Z DTEND:20150324T193000Z DTSTAMP:20260828T094430Z UID:2r7mrmtdci249u69iqu9a1pfog@google.com CREATED:20150319T204638Z DESCRIPTION:Speaker Name: Rolando Somma \n\nSpeaker Institution: Los Alamo s National Lab\n\nTitle: Quantum simulations of one-dimensional quantum sys tems\n\nAbstract: One of the best known problem that a quantum computer is expected to solve more efficiently than a classical one is the simulation o f quantum systems. While significant work has considered the case of discre te\, finite dimensional quantum systems\, the study of fast quantum simulat ion methods for continuous-variable systems has only received little attent ion. In this talk\, I will present quantum methods to simulate the time evo lution of two quantum systems\, namely the quantum harmonic oscillator and the quantum particle in a quartic potential. Our methods are based on well- known product formulas for approximating the evolution and result in superp olynomial and polynomial quantum speedups\, respectively. I will also prese nt efficient quantum algorithms to prepare the eigenstates of the quantum h armonic oscillator that can be used to compute spectral properties and may be of independent interest. Generalizations and connections between our res ults and the so-called fractional Fourier transform\, which is a generaliza tion of the Fourier transform used in signal analysis\, will also be discus sed\n LAST-MODIFIED:20150319T205151Z LOCATION:CSS 3100A SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150225T210000Z DTEND:20150225T223000Z DTSTAMP:20260828T094430Z UID:qg9c8crgi0mqrqitaus9ufeebc@google.com CREATED:20150220T162452Z DESCRIPTION:Speaker Name: Eugeni Grauges\n\nSpeaker Institution : Universit at de Barcelona / University of Maryland\n\nTitle: Measurement of the phot on polarisation in b --> s gamma decay\n\nAbstract : Rare b—> s gamma flavo ur changing neutral current processes are can be very sensitive to new phys ics (NP) effects. These transitions are allowed only at loop level and NP m ay arise from the exchange of new heavy fermions in the electroweak penguin loop\, distorting the SM picture of this decays modifying amplitudes\, pha ses and the Lorentz structure. While measurements of the inclusive rate and CP violation asymmetries agree with SM calculations\, no evidence exist fo r the polarisation of photons in this type of decays. The SM model predicts that the photon emitted in b—> s gamma decays is predominantly left handed \, since the recoil s quark that couples to the W boson is left-handed. Tha t implies a maximal parity violation up to small corrections of the order m _s / m_b.\nIn this talk I will review two different analysis of B meson rad iative decays that are sensitive to the photon polarisation. The first (sti ll in process within LHCb) is based on the experimental study of the time dependent decay rate of the B_s—> Phi gamma process. The second (already p ublished) is based on the angular study of the B —> Kππ gamma decays.\n LAST-MODIFIED:20150220T164100Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160217T160000Z DTEND:20160217T170000Z DTSTAMP:20260828T094430Z UID:9l7jk6inn5sid3lc9rj6sbfa58@google.com CREATED:20160114T185916Z DESCRIPTION:Speaker Name: Eric Chitambar\n\nSpeaker Affiliation: Southern I llinois University\n\nTitle: A Critical Examination of Coherence Resource T heories\n\nAbstract: Considerable work has recently been directed toward de veloping resource theories of quantum coherence. In this talk I will review the general structure of such resource theories\, and I will argue that al l currently proposed basis-dependent approaches to quantum coherence fail t o be physically consistent. That is\, the “free” or “incoherent” operations defined within these frameworks ultimately require the consumption of quan tum coherence to be physically implemented. Despite this lack of consistenc e\, I will explain how many of the currently proposed classes of incoherent operations still may be of physical interest. In particular\, I will descr ibe how entanglement and coherence can be related to each other through the tasks of resource dilution and resource distillation using local incoheren t operations and classical communication.\n\nThis talk will cover joint wor k with Alex Streltsov et. al (arXiv:1507.08171)\, Min-Hsiu Hsieh (arXiv:150 9.07458)\, and Gilad Gour (TBP).\n LAST-MODIFIED:20160217T152317Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150130T170000Z DTEND:20150130T173000Z DTSTAMP:20260828T094430Z UID:1albo40dhi327fig0015e1cok4@google.com CLASS:PUBLIC CREATED:20150126T124536Z DESCRIPTION:Speaker Name: David Wong-Campos\n \nSpeaker Institution: JQI\n \nTitle: High resolution imaging of a single atom\n \nAbstract: Optical aberrations represent a departure from the paraxial behavior of light leadi ng to lower image quality. In this talk\, we will present a method of aberr ation correction characterized by an expansion of Zernike polynomials. We r eport high resolutions\, spot sizes of 377(5) nm and diffraction limited im age performance of a single atomic 171Yb+ ion using refractive optics eleme nts with a 0.6 input numerical aperture and working distance of 11.5 mm. LAST-MODIFIED:20150126T124552Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI LUNCH SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140930T200000Z DTEND:20140930T210000Z DTSTAMP:20260828T094430Z UID:ta7k0dgmeqhhs4i0micjcli9kk@google.com CREATED:20140718T145051Z DESCRIPTION:Speaker Name: Johnpierre Paglione\n\nSpeaker Institution: Uni versity of Maryland\n\nTitle: Non-trivial pursuits: finding topological st ates of matter\n\nAbstract: Topological insulator (TI) materials\, with me tallic boundary states protected against time-reversal-invariant perturbati ons\, are a new and exciting avenue for realizing exotic quantum states of matter with strong potential for new and advanced technologies. As usual\, predictions of new three-dimensional TI materials are widespread but obtain ing conclusive proof of the existence of non-trivial TI states continues to be a challenge. To date\, the majority of effort has focused on a family o f layered bismuth-based compounds now regarded as the archetype TI material . However\, these materials are in reality good conducting metals with bulk carriers\, requiring advanced device and measurement techniques to dig out the intrinsic topological state properties. I will discuss our efforts to advance this state of affairs by improving on materials quality and diversi ty\, focusing on both non-interacting Bi2Se3 and the "new" mixed-valence to pological Kondo insulator SmB6. Using unique synthesis techniques as well a s careful low-temperature experiments\, we have new convincing evidence and characterization of the topologically non-trivial surface states in these materials.\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hang outs/_/physics.umd.edu/physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3 JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ta7k0dgmeqhhs4i0micjcli9kk&hs=121 LAST-MODIFIED:20140908T125716Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141030T163000Z DTEND:20141030T173000Z DTSTAMP:20260828T094430Z UID:snu9u3qs4kmrv1mmuh98ou94lo@google.com CREATED:20140911T185655Z DESCRIPTION:Speaker Name: Andrey Vilesov\n\nSpeaker Institution : USC\, Dep t of Chemistry\n\nTitle: X-ray diffraction imaging of quantum vortices in superfluid He droplets\n\nJoin with Google Hangouts: https://hangouts.googl e.com/hangouts/_/physics.umd.edu/applied?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0 amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.snu9u3qs4kmrv1mmuh98ou94lo&hs=12 1 LAST-MODIFIED:20140911T185655Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140124T200000Z DTEND:20140124T210000Z DTSTAMP:20260828T094430Z UID:jjjimkpcebctuf40gsp74ht1vo@google.com CREATED:20140103T200435Z DESCRIPTION:Speaker Name: Dr. David Schaffner\n\nSpeaker Institution : Swar thmore College\n\nTitle : Turbulence Analysis and an Observation of Intermi ttency Scaling with >> Magnetic Helicity in an MHD wind-tunnel\n\nAbstract : A selectively decayed Taylor state is created in the MHD wind-tunnel conf iguration of the Swarthmore Spheromak Experiment (SSX). Turbulence analyses show broadband power-law spectra in magnetic field\, density and velocity fluctuations as well as intermittency in magnetic fluctuations. Invoking Ta ylor hypothesis arguments\, an observed break in the magnetic field spectra is consistent with ion inertial scale length. Evidence for magnetic varian ce anisotropy is also identified. The intermittency in turbulent magnetic f ield fluctuations has been observed to scale with the amount of magnetic he licity injected into the plasma. The level of intermittency is determined b y finding the flatness of the probability distribution function of incremen ts for dB/dt. The intermittency is observed to increase with the injected h elicity while the spectral index in the inertial range of the turbulence is unaffected by this variation.\nEvidence for the role of current sheets and reconnection sites in the generation of this intermittency is provided\, b ut the true nature of the observed intermittency remains unknown.\n LAST-MODIFIED:20140103T200435Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151007T180000Z DTEND:20151007T190000Z DTSTAMP:20260828T094430Z UID:el9rmbf2v1sv7cirn3lu38emt4@google.com CREATED:20150930T200450Z DESCRIPTION:Title : Plasma Physics at the National Science Foundation\nSpea ker Name: Prof. Vyacheslav (Slava) Lukin\nSpeaker Institution : National Sc ience Foundation/U. Washington LAST-MODIFIED:20150930T200500Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141008T193000Z DTEND:20141008T203000Z DTSTAMP:20260828T094430Z UID:2rgu8sk1q120anv4qks43t9d28@google.com CREATED:20141002T133208Z DESCRIPTION:Speaker Name: Dr. Sankar Das Sarma\n\nSpeaker Institution : UMC P\n\nTitle : Has (the) Majorana really returned?\n\nAbstract : Ettore Major ana wrote an important paper in 1937 introducing the concept of Majorana fe rmions which are their own anti-particles. (Neutrinos may or may not be Maj orana fermions—experiments are ongoing looking for double beta decay to set tle this question decisively.) Then Majorana himself mysteriously vanished in 1938 and was never seen again. Recent work in condensed matter physics i ndicates that there may be a very exotic manifestation of Majorana particle s in ordinary condensed matter systems made of semiconductors and supercond uctors. Thus\, Majorana’s hypothetical particles may have finally been foun d in solid state systems 75 years after their prediction. In my talk I will explain the meaning of the question posed in the title and provide an answ er for the question through a critical theoretical analyses of the recent e xperiments searching for the non-Abelian Majorana mode in condensed matter systems. I will also describe the significance of the question/answer discu ssed in this talk in the context of topological quantum computation which i s fault-tolerant as a matter of principle and does not require any quantum error correction. The solid state realizations of the Majorana ‘particles’ to be described in this talk are not Dirac fermions obeying Fermi statisti cs\, but are instead strange localized objects obeying non-Abelian anyonic braiding statistics.\n\n\n\n\n\n\nJoin with Google Hangouts: https://hangou ts.google.com/hangouts/_/physics.umd.edu/lab-for?hceid=bGJrNjYwYTc1YjhqaDdl azZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.2rgu8sk1q120anv4qks43t9d 28&hs=121 LAST-MODIFIED:20141002T141816Z LOCATION:Location: Lab for Physical Sciences (downstairs conference room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Lab for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140127T160000Z DTEND:20140127T173000Z DTSTAMP:20260828T094430Z UID:rpl4kal9h7jjb22m6moeh928j4@google.com CLASS:PUBLIC CREATED:20131216T190446Z DESCRIPTION:Speaker: Alexey Gorshkov\, JQI\n\nTitle: Harnessing Quantum Sy stems with Long-Range Interactions\n\nAbstract: AMO (atomic\, molecular\, and optical) systems with long-range interactions\, such as Rydberg atoms\, polar molecules\, and ions\, are arguably the most controllable\, tunable\ , and strongly interacting quantum systems. In this talk\, we will first re view how precise control over such systems has recently opened a new paradi gm for quantum computing and communication\, entanglement generation\, and engineering of new phases of matter. Motivated by recent experiments\, we w ill then focus on lattice systems with interactions featuring power-law dec ay with distance. In particular\, we will derive a new bound on the propaga tion of information in such systems and exhibit a simple model that partial ly saturates the new bound [1]. The new bound is expected to provide crucia l insights into numerous equilibrium and non-equilibrium phenomena in long- range-interacting systems and is on the verge of being verified experimenta lly by the trapped ion community [2\,3]. \n\n[1] Z.-X. Gong\, M. Foss-Feig\ , S. Michalakis\, AVG\, to appear on arXiv Sunday night (Jan 26).\n\n[2] P. Richerme\, Z.-X. Gong\, A. Lee\, C. Senko\, J. Smith\, M. Foss-Feig\, S. M ichalakis\, AVG\, C. Monroe\, arXiv:1401.5088.\n\n[3] P. Jurcevic\, B. P. L anyon\, P. Hauke\, C. Hempel\, P. Zoller\, R. Blatt\, C. F. Roos\, arXiv:14 01.5387. \n LAST-MODIFIED:20140124T151214Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140313T180000Z DTEND:20140313T193000Z DTSTAMP:20260828T094430Z UID:4jsugui0kca53g0il8ohgfs5ik@google.com CREATED:20140205T023429Z DESCRIPTION:Speaker Name: Ivar Martin\n\nSpeaker Institution: Los Alamos National Lab \n\nTitle: SPONTANEOUS QUANTUM HALL EFFECT AND FRACTIONALIZAT ION IN \n ITINERANT CHIRAL MAGNETS\n\nAbstract: When electrons mov e in a magnetic material\, their transport can be profoundly affected by sc attering off magnetic ions. Converse is also true: Itinerant electrons th emselves can define the magnetic state into which the system orders. Even though typically these magnetic states are simple e.g. ferromagnetic or ant iferromagnetic sometimes\, complex chiral magnetism can appear. \n\nNon-cop lanar itinerant magnets are expected to exhibit highly unusual transport ph enomena that stem from a quantum coherent effect of non-coplanar magnetic o rdering on electrons\, which is similar to the Aharonov-Bohm effect. It ca n lead to the spontaneous quantum Hall effect and ground-state electrical a nd spin currents. The equivalent strength of the orbital magnetic field can exceed 10^4 Tesla. The stable topological excitations (magnetic vortices) in these states can carry fractional electronic charge and spin and realiz e anyonic exchange statistics. \n\nIn this talk I will present several exam ples of two- and three-dimensional itinerant models of magnetism that exhib it complex non-coplanar ordering even in the absence of spin orbit interact ion\; I will describe possible material realizations.\n\nHost: Vladimir Ma nucharyan\n LAST-MODIFIED:20140307T154824Z LOCATION:PHYS Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140508T150000Z DTEND:20140508T160000Z DTSTAMP:20260828T094430Z UID:obscp75ride4f1it9fg6k7l0hg@google.com CLASS:PUBLIC CREATED:20140502T202211Z DESCRIPTION:Speaker Name: Arghavan Safavi-Naini\n\nSpeaker Institution: Har vard (ITAMP)\n\nTitle: Exploring novel quantum phases with dipole bosons in layered systems\n\nAbstract: Trapped polar molecules can be used to study the role of dipole-dipole interactions in stabilizing novel quantum many-bo dy phases. In this talk we study dipoles trapped in layered geometries usin g quasi one- and two-dimensional traps. These configurations provide an ide al setup to explore the long-range and anisotropic character of the dipole- dipole interactions and its role in stabilizing novel quantum phases.\nSpec ifically\, we present the phase diagrams of dipoles in single\, bilayer and multilayer geometries calculated using Path Integral Quantum Monte Carlo\, using the Worm Algorithm. We use a two-worm algorithm to study pair format ion and the many-body phases in the bilayer geometry in the absence of inte r-layer tunneling. We find several non-trivial phases\, such as the pair su persolid\, and the pair superfluid phases.\nMoreover\, we have used a novel N-worm algorithm\, as well as the bosonization method to study the phase d iagram and the formation of chains in a stack of one-dimensional optical la ttices with no inter-tube tunneling. We will show that these chains are sta bilized for arbitrarily small interactions. Additionally we have found seve ral non-trivial ground states\, namely superfluids and counter-superfluids made of composites of particles from different tubes\, 1D checkerboard insu lators\, and mixtures of these phases.\n\nHost: Mohammad Faghfoor Maghrebi LAST-MODIFIED:20140507T145508Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150406T150000Z DTEND:20150406T160000Z DTSTAMP:20260828T094430Z UID:ri6ccs12aonuhggb7cpjn1g4ac@google.com CLASS:PUBLIC CREATED:20150326T162729Z DESCRIPTION:Speaker: Ileana Rau\, IBM Research\, San Jose\, CA\n\nTitle: To ward Single Atom Magnets\n\nAbstract: Magnetic anisotropy is a fundamental property of magnetic materials that governs the stability and directionalit y of their magnetization. The ability to control the magnetic anisotropy of nanoscale systems will open novel avenues for spintronics\, magnetic memor y devices\, and quantum computation. At the atomic level\, magnetic anisotr opy originates from the spin-orbit coupling that connects the spin moment o f a magnetic atom to the spatial symmetry of its ligand or crystal field en vironment. In the case of 3d transition metal atoms\, the same crystal fiel d that is necessary for the anisotropy usually quenches the orbital moment and reduces the total magnetic moment of the atom to its spin component. As a result\, single molecule magnets and magnetic tunnel junctions show an a nisotropy energy per atom that is typically one to two orders of magnitude smaller than the maximal value allowed by the spin-orbit coupling. We have overcome this limitation by carefully designing the coordination geometry o f magnetic atoms on a surface to preserve the orbital moment while inducing uniaxial anisotropy. I will present scanning tunneling spectroscopy and x- ray absorption spectroscopy measurements that show that single Cobalt atoms deposited on a thin MgO layer retain most of their free-atom orbital momen t L=3. Because Cobalt adsorbs on top of the Oxygen atom\, the resulting cry stal field is effectively cylindrical and leads to a strikingly large magne tic anisotropy energy\, at the theoretical limit. Spin-polarized tunneling measurements reveal a stable magnetic groundstate with a large total moment of ~5.5µB and a long-lived excited state of opposite magnetic moment with a relaxation time of 0.2 ms. These results offer a strategy\,based on symme try arguments and careful tailoring of the interaction with the environment for the rational design of nanoscopic permanent magnets and single atom ma gnets. LAST-MODIFIED:20150401T121854Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150225T203000Z DTEND:20150225T213000Z DTSTAMP:20260828T094430Z UID:t1cmtknn2e5qikh3k1omub77i0@google.com CREATED:20150220T164323Z DESCRIPTION:Speaker Name: Dr. John R. Lawall\n\nSpeaker Institution: NIST\n \nTitle: High contrast gratings: A novel platform for optomechanics\n\nAbst ract: Diffraction gratings with periods smaller than the wavelength of the incident light have recently emerged as a novel platform for a host of opti cal devices. We design and fabricate such “high contrast gratings” in sili con nitride\, creating not only the world’s lightest high-reflectivity mirr or\, but simultaneously a very high quality mechanical resonator. We have integrated the structures into Fabry-Perot cavities\, enabling sensitive re adout of the mechanical motion\, along with the ability to control the mech anical dynamics via the radiation pressure of the intracavity field. We ar e able to optically cool hundreds of mechanical modes simultaneously\, reac hing effective temperatures in the vicinity of 1 K. In a complementary reg ime\, we overcome the intrinsic mechanical damping of the grating mirror by means of optically-furnished gain\, and study multimode dynamics in a “pho non laser.” In recent experiments\, we use a high contrast grating to coup le two optical cavities\, creating optical modes whose frequencies exhibit a strong avoided crossing as the grating position is varied. We engineer a system with optomechanical bistability\, and observe “buckling” behavior o f the optomechanical device. This configuration should allow new approache s to force sensing beyond the standard quantum limit\, and pave the way for recently proposed experiments involving the collective motion of arrays of such highly-reflective membranes.\n\nNotes: For guests attending the LPS s eminar\, please use the phone on the left hand side of the front door to ca ll the receptionist for entry. LPS is located at 8050 Greenmead Drive in Co llege Park. There is parking at LPS and overflow parking at the adjacent LT S building but not at the 4H building. LPS is on the UMCP shuttle route\; t ake #105 for the Courtyard Apts. LAST-MODIFIED:20150220T164323Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130920T150000Z DTEND:20130920T163000Z DTSTAMP:20260828T094430Z UID:bpnh8l6r5f8iirj8m8m7uh0tfk@google.com CREATED:20130911T151917Z DESCRIPTION:Speaker: Dan E. Prober\, Yale University\n\nTitle: Ultrasensit ive THz Detection with Graphene Nanobolometers\n\nAbstract: Graphene has r ecently been proposed as an ultrasensitive THz photon detector element with unsurpassed sensitivity. We have modeled the physical processes in a graph ene single-photon detector in the THz range.(1-3) A Johnson noise temperat ure readout would be employed. We conclude that detection of individual THz photons should indeed be possible. Recently we have studied in experiment the energy loss processes in graphene above 2K\, a key determinant of the photon detector performance. Current experiments extend these measurements down to 50 mK\, with graphene bolometers having superconducting contacts. These contacts are used to confine the absorbed photon energy to the graph ene\, to allow the full detection sensitivity to be achieved.\n\n1. “Graphe ne-based Bolometers\," Xu Du\, Daniel E. Prober\, Heli Vora\, and Chris McK itterick\, arxiv:1308.4065 [cond-mat.mes-hall] (2013).\; submitted to J. Lo w Temp. Phys. \n\n2. “Graphene microbolometers with superconducting contac ts for terahertz photon detection\," C.B. McKitterick\, H. Vora\, X. Du\, B .S. Karasik\, and D.E. Prober\, arxiv:1307.5012 [cond-mat.mes-hall] (2013). \n\n3. "Performance of Graphene Thermal Photon Detectors\," C.B. McKitteri ck\, D.E. Prober\, and B.S. Karasik\, Journal of Applied Physics 113 044512 (2013).\n\nAll references available in www.yale.edu/proberlab\n\nHost: De nnis Drew\n LAST-MODIFIED:20130911T151924Z LOCATION:Phys room 2202 (next to the elevator) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160304T174000Z DTEND:20160304T184000Z DTSTAMP:20260828T094430Z UID:23revmi4ja72qtsiiboegqkn7c@google.com CREATED:20160226T130025Z DESCRIPTION:Speaker: Hilary Hurst\n\nInstitution: JQI\, CMTC\n\n(Free lunch served at 12:30)\n\nTo accommodate the prospective graduate student visit\ , this talk is NOT at the normal time. Instead\, we will have lunch at 12:3 0 followed by a talk at 12:40 (instead of the regular schedule of 12:00 lun ch and 12:15 talk).\n\nTitle: Interplay of Dirac surface states and magneti c fluctuations in topological insulator heterostructures\n\nAbstract: We co nsider the proximity effect between Dirac states at the surface of a topolo gical insulator and a ferromagnet with easy plane anisotropy\, which is des cribed by the XY-model and undergoes a Berezinskii-Kosterlitz-Thouless (BKT ) phase transition driven by magnetic vortices. Classical mag- netic fluctu ations interacting with the surface states of a topological insulator can b e described by an effective gauge field. This model can be mapped onto the problem of Dirac fermions in a random magnetic field\, however this analogy is only partial in the presence of electron-hole asymmetry or warping of t he Dirac dispersion which results in screening of magnetic fluctuations. We show that this proximity coupling leads to anomalous transport behavior of the surface states near the BKT transition temperature. We also discuss to pological insulator heterostructures as a platform for studying Dirac physi cs.\n LAST-MODIFIED:20160226T130257Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140228T180000Z DTEND:20140228T190000Z DTSTAMP:20260828T094430Z UID:77lvthsuc482bkht7em6snp0nk@google.com CREATED:20140224T183232Z DESCRIPTION:Speaker Name: Doreen Edwards\n\nSpeaker Institution : Alfred Un iversity\n\nTitle: UMD ADVANCE Seminar Series: Ceramic Thermoelectrics for High‐Temperature Energy Recovery\n\nAbstract: Waste heat is a by‐product of inefficient energy production and consumption. Thermoelectric generators offer the potential to recapture this lost heat and convert it to useable electric energy. Thermoelectric generators (TEGs) have been used in niche l ow‐power\, low‐temperature applications for decades\, but many conventional thermoelectric materials are intermetallics that cannot be operated at hig h temperature in oxidizing conditions. Ceramic materials may offer a signif icant advantage over conventional thermoelectric materials for industrial a nd automotive waste heat recovery\, but their thermoelectric performance la gs behind conventional thermoelectric materials. This seminar will present an overview of this growing field of research with an emphasis on design an d characterization of oxide and boride materials. LAST-MODIFIED:20140224T183242Z LOCATION:Room 2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Semianar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120130T173000Z DTEND:20120130T183000Z DTSTAMP:20260828T094430Z UID:qduol6chj4icn2f7mbb4fqeb9o@google.com CREATED:20120104T141247Z DESCRIPTION:Title: Micro-electromechanics: A new quantum technology.\nSpea ker: Konrad Lehnert\, University of Colorado and NIST\nAbstract: Micro-me chanical resonators are an established technology for processing classical signals. The field of quantum micro-electromechanics seeks to use these res onators to process signals in an essentially quantum way. In this talk\, I will describe how we use electricity to achieve exquisite control and measu rement of micro-mechanical resonators. Our tools are now sharp enough to br ing these objects into a regime of quantum behavior. Having entered the qua ntum regime\, we are now able to pursue many exciting ideas. We endeavor to : store quantum information on a chip by exploiting the relatively slow pro pagation of sound compared to light\, transfer quantum states between two i ncompatible systems via a mechanical intermediary\, and test quantum theory itself in an unexplored region of mass and size scales. \n\n\n LAST-MODIFIED:20120104T141254Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Konrad Lehnert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140501T180000Z DTEND:20140501T193000Z DTSTAMP:20260828T094430Z UID:296ij9dtvpst5b8b7ej5qr577c@google.com CREATED:20140406T025007Z DESCRIPTION:Speaker: Chris Marianetti\, Columbia University\n\nTitle: Sof t phonon modes in strained monolayer materials\n\nAbstract: Two dimensiona l materials display a wealth of novel phenomena\, including unique soft pho non modes. Here we show that monolayer materials possessing semimetallic\, semiconducting\, and insulating electronic ground states all exhibit a sim ilar phonon instability under sufficient strain. More specifically\, graph ene\, BN\, graphane\, and MoS2 all exhibit a K-point phonon instability whi ch leads to mechanical failure under strain. The transition is first-order in all cases except graphene. For BN\, graphane\, and MoS2 the phase transi tions are not associated with the opening of a band gap\, which indicates t hat Fermi surface nesting is not the driving force. We perform an energy de composition that demonstrates why the soft modes at the K-point are unique and how strain drives the phonon instability. The remainder of the talk is dedicated to TaS2\, where a phonon instability is shown to drive a Mott ins ulating state in the monolayer and a novel one dimensional metal in the bul k.\n\n\n\nHost: Nick Butch\n\n LAST-MODIFIED:20140430T204611Z LOCATION:Phys Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140403T173000Z DTEND:20140403T180000Z DTSTAMP:20260828T094430Z UID:b9qd3farcikea63aciemuq92fc@google.com CREATED:20140212T163853Z LAST-MODIFIED:20140212T163853Z LOCATION:Phys room 1305F\; the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150521T180000Z DTEND:20150521T193000Z DTSTAMP:20260828T094430Z UID:ijl0lh1uq5i18g37v9sck5eksc@google.com CREATED:20150510T193303Z DESCRIPTION:Speaker Name: Prof. Daniel Prober\n\nSpeaker Institution: Yale University\n\nTitle: Single-Photon THz (Far-Infrared) Detectors\n\nAbstra ct: We have studied the electron energy loss processes in very sensitive s uperconducting nanobolometers[1] and in non-superconducting microstructures \, both at very low temperatures. These devices can be used in very sensi tive astronomy single-photon detectors in the far-infrared region of the sp ectrum\, and could be used in future NASA satellite observatories. While t heir science is being established\, the electron phonon physics is of signi ficant interest. We have studied the electron energy loss processes in det ail.\n\n--Research at Yale was supported by NSF\, Yale\, and NASA/JPL\n1. " Energy resolution of terahertz single-photon-sensitive bolometric detectors \," D.F. Santavicca\, B. Reulet\, B.S. Karasik\, S.V. Pereverzev\, D. Olaya \, M.E. Gershenson\, L. Frunzio and D.E. Prober\, Appl. Phys. Lett. 96\, 08 3505 (2010).\n\nHOST: Prof. Vladimir Manucharyan LAST-MODIFIED:20150514T202926Z LOCATION:Room 1201\; John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140421T200000Z DTEND:20140421T210000Z DTSTAMP:20260828T094430Z UID:o9v6bbgcvgsc45bir2ql3vc80k@google.com CREATED:20140325T182716Z DESCRIPTION:Speaker Name: Sergey Bezrukov\n\nSpeaker Institution : NIH\n\nT itle : Transport under strong confinement: Counter-intuitive analytical res ults and supporting experiments with beta-barrel channel LAST-MODIFIED:20140325T182716Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141021T150000Z DTEND:20141021T163000Z DTSTAMP:20260828T094430Z UID:os7i99mb5m48u6slbja3pf2vbk@google.com CREATED:20140911T140245Z DESCRIPTION:Speaker Name: Shinsei Ryu\n\nSpeaker Institution: University of Illinois\n\nTitle: Gravitational anomalies in topological insulators an d superconductors\n\nAbstract: Topological superconductors are fermionic (s ymmetry-protected) topological phases of matter where fermionic superconduc ting quasiparticles have topologically non-trivial wave functions. They exi st in all spatial dimensions (one\, two and three)\, and can be protected b y various kinds of discrete symmetries\, such as time-reversal or spatial s ymmetries. Unlike topological insulators where non-trivial topology of elec tron wave functions can show up in their electrical transport properties\, in topological superconductors\, one needs to resort on more intricate prob e such as thermal transport due to the lack of conserved U(1) quantities (e .g.\, electric charge). I will discuss various kinds of responses of topolo gical insulators to thermal and mechanical perturbations\, which allows us to identity their non-trivial topological properties. I will also argue tha t\, similarly to the role played by U(1) gauge invariance in Laughlin's tho ught experiment\, the invariance under coordinate transformations (diffeomo rphism invariance) can be used to study interaction effects on (symmetry-pr otected) topological states of matter.\n\nHost: Philip Brydon\n\nhttp://ww w.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20141017T180235Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T190000Z DTEND:20140331T200000Z DTSTAMP:20260828T094430Z UID:57eo2n0lrhg100t2c01uq5f1ro@google.com CREATED:20140321T202506Z DESCRIPTION:Title: Universality of Long-Distance AdS Physics from the CFT\n Bootstrap\n\nSpeaker: Jared Kaplan\, Johns Hopkins\n\nAbstract: We begin by explicating a recent proof of the cluster decomposition\nprinciple in AdS_ {d+1} from the CFT_d bootstrap in d > 2. The CFT\nargument also computes t he leading interactions between distant\nobjects in AdS\, and we confirm th e universal agreement between the CFT\nbootstrap and AdS gravity in the sem i-classical limit.\n\nWe proceed to study the generalization to 2d CFTs\, w hich requires\nknowledge of the Virasoro conformal blocks in a lightcone OP E limit.\nWe compute these blocks in a semiclassical\, large central charge \napproximation\, and use them to prove a suitably modified theorem. In\np articular\, from the 2d bootstrap we prove the existence of large spin\nope rators with fixed `anomalous dimensions' indicative of the presence\nof def icit angles in AdS_3. As we approach the threshold for the\nBTZ black ho le\, interpreted as a CFT scaling dimension\, the twist\nspectrum of large spin operators becomes dense.\n\nDue to the exchange of the Virasoro identi ty block\, primary states\nabove the BTZ threshold mimic a thermal backgrou nd for light\noperators. We derive the BTZ quasi-normal modes\, and we u se the\nbootstrap equation to prove that the twist spectrum is dense.\nCorr ections to thermality could be obtained from a more refined\ncomputation of the Virasoro conformal blocks.\n\n LAST-MODIFIED:20140326T161211Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150206T180000Z DTEND:20150206T190000Z DTSTAMP:20260828T094430Z UID:kcgg494qvrp8c44keh2mu66oe4@google.com CREATED:20150123T205134Z DESCRIPTION:Speaker Name: Wangchun Chen\n\nSpeaker Institution : NIST Cente r for Neutron Research\n\nTitle : Polarized Neutron Developments at the NIS T Center for Neutron Research\n\nAbstract : Polarized neutron scattering is a powerful tool to probe magnetic structures over a variety of length scal e\, magnetization density and magnetic excitations in a wide range of magne tic materials in physics\, chemistry\, material science and earth science. However polarized neutron scattering is one of the most challenging neutron instrumentation techniques due to significant intensity reduction from pol arized beam production and analysis\, necessity of precise spin manipulatio n\, and complicated data reduction and analysis. Using a novel neutron pola rizing device\, nuclear-spin-polarized 3He neutron spin filter (NSF)\, pola rized neutron measurement capabilities have been significantly advanced dur ing the last several years at the NIST Center for Neutron Research (NCNR). I will outline developments of polarized neutron instrumentation using po larized 3He NSFs\, including thermal triple axis spectrometry\, small-angle neutron scattering\, wide-angle polarization analysis\, and diffuse reflec tometry. These advanced polarized neutron measurement capabilities at the N CNR are opening new scientific opportunities to studies of magnetic nanopar ticles assemblies\, multiferroics\, superconductors\, exchange-biased syste ms\, and giant magnetostrictive materials. Examples of such scientific appl ications will be presented. Finally I will discuss a recent observation of world record high (up to 88%) 3He polarizations achieved by the spin-exchan ge optical pumping method.\n LAST-MODIFIED:20150123T205134Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140417T173000Z DTEND:20140417T180000Z DTSTAMP:20260828T094430Z UID:vbcfcb1lg51si6t3hg1plklb5g@google.com CREATED:20140406T024456Z LAST-MODIFIED:20140406T024514Z LOCATION:Phys room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150408T200000Z DTEND:20150408T210000Z DTSTAMP:20260828T094430Z UID:6aq3p3j2rj2hg8ucbe9kp3oii0@google.com CREATED:20150205T142846Z DESCRIPTION:Speaker Name: Zoltan Ligeti\n\nSpeaker Institution: Lawrence Be rkeley National Laboratory\n\nTitle: The B -> D(*) tau nu anomalies: facts and/or fictions\n\nAbstract: The ratios of the measured B -> D(*) l nu deca y rates for l=tau vs. e\,mu deviate from the standard model (SM) by more th an 3 sigma. We show that the data are in tension with the SM\, independent of form factor calculations. We classify the operators that can accommoda te the measured central values\, as well as their UV completions. Contrary to other statements in the literature\, the flavor structure of new physic s may be minimally flavor violating\, and we give examples involving mediat ors with W' or leptoquark quantum numbers. Experimental signatures of these scenarios may be observable at the LHC and/or Belle II. LAST-MODIFIED:20150330T130248Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150423T200000Z DTEND:20150423T210000Z DTSTAMP:20260828T094430Z UID:incip3d5hujpo1bstqtvu619gc@google.com CREATED:20150408T174630Z DESCRIPTION:Speaker Name: Ian Appelbaum\n\nSpeaker Institution: University of Maryland\n\nTitle: Symmetry\, Anisotropy and Dimensionality: Spin physi cs in the elemental semiconductors Si\, Ge\, and P \n\nAbstract: By the 198 0s\, an accumulation of decades of research on charge transport in the elem ental semiconductors silicon and germanium led to a lingering perception th at there was nothing left for condensed matter physics to do with them. How ever\, just before arriving at UMD almost 7 years ago\, my lab demonstrated that these "old dogs" could be taught a few more "new tricks": Basic resea rch on charge dynamics in these electronic materials eventually led to scor es of real-life device applications\, but spin dynamics remained unexplored . We figured out how to overcome several experimental challenges to inject spin-polarized electrons into these otherwise-nonmagnetic materials\, and detect their remaining non-equilibrium spin orientation after traveling ove r amazingly long distances. In this talk\, I will describe some of our many recent breakthroughs enabled by unique experimental capabilities and thoro ugh theoretical understanding of both intrinsic and extrinsic phenomena dom inating spin transport in Si and Ge. Furthermore\, these two examples are n ot the end of the story\, as new research moves forward into the spin physi cs of 2D elemental semiconductors like single-layer black phosphorus\, or ' phosphorene'. LAST-MODIFIED:20150420T170508Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Ian Appelbaum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131210T181500Z DTEND:20131210T193000Z DTSTAMP:20260828T094430Z UID:s67sk82ifr08qbjai17u29idgo@google.com CREATED:20131202T155336Z DESCRIPTION:Title : Shock Turbulence in Finance and Its Monetization.\n\nSp eaker Name: Dr. Michael Lipkin\n\nSpeaker Institution : Katama Trading LLC\ n LAST-MODIFIED:20131202T164006Z LOCATION:Room 1116\, IPST Building\, Building 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150921T200000Z DTEND:20150921T210000Z DTSTAMP:20260828T094430Z UID:t0bvvt73ub0lqiabh44uuo05mc@google.com CREATED:20150916T134219Z DESCRIPTION:Title : Membrane rigidity and thermorheology of cells\nSpeaker Name: Sebestain Schmidt\, University of Leipzig LAST-MODIFIED:20150916T134220Z LOCATION:Chemistry Bldg\, Room 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140512T150000Z DTEND:20140512T163000Z DTSTAMP:20260828T094430Z UID:kdssqpv5dbvta0piv28r85ig90@google.com CLASS:PUBLIC CREATED:20140102T150745Z DESCRIPTION:Speaker Name:Theresa Lynn\n\nSpeaker Institution: Harvey Mudd C ollege\n\nTitle: It Takes a Quantum to Know a Quantum: Limits on Distingui shabiliy of Hyperentangled Bell States with Linear Evolution and Local Meas urement\n\nAbstract: A measurement of the entangled state\, or Bell state\ , of two particles is essential to numerous protocols in quantum communicat ion\, such as quantum teleportation\, entanglement swapping\, and quantum d ense coding. Numerous experiments use linear evolution and local measureme nt to approximate Bell-state measurements\; such an approach is poorly matc hed to the nature of the entangled states and thus can only be conditionall y successful. Nevertheless\, the exact limitations of this approach are re levant to many existing and planned experiments\, particularly as we develo p the ability to work with particles entangled simultaneously\, or hyperent angled\, in several degrees of freedom.\nI will discuss limits on hyperenta ngled Bell-state distinguishability for an apparatus restricted to LELM. F or two identical particles entangled in n qubit variables\, I present a sim ple proof that\, of the 4n hyperentangled Bell states\, 2(n+1)-1 is the lar gest subset that can be reliably distinguished with LELM. This result gene ralizes well-known results for n =1\,2\, and gives us physical intuition wi th which to understand those limits. I will also discuss distinguishabilit y bounds for two particles entangled in several qudit variables.\n\nHost: L uis Orozco LAST-MODIFIED:20140509T164550Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140820T140000Z DTEND:20140820T150000Z DTSTAMP:20260828T094430Z UID:t7t0mjv6mo204nkpkj6pk3hq3s@google.com CREATED:20140725T131448Z DESCRIPTION:Speaker Name: Juan-Jose Garcia-Ripoll\n\nSpeaker Institution: Instituto de Física Fundamental\, Madrid\n\nTitle: Some results on the spin -boson model\n\nAbstract: In this talk I will discuss various applications and results on this well know model\, which has found a new life in a varie ty of experimental systems that combine two-level systems with bosonic degr ees of freedom\, such as circuit-QED and trapped ions. The ideas I will dis cuss are related mainly to (i) the propagation of quantum information and c orrelations in the system and (ii) the existence of quantum phase transitio ns in regimes of “ultra-strong” coupling\, where the counter-rotating t erms of the spin-boson interaction play a relevant role. In passing I will review the theoretical and numerical tools we use to solve these problems.\ nLieb-Robinson bounds for spin-boson lattice models and trapped ions\, J. Juenemann\, A. Cadarso\, D. Perez-Garcia\, A. Bermudez\, J.J. Garcia-Ri poll\nPhys. Rev. Lett. 111\, 230404 (2013)\nHybrid quantum magnetism in cir cuit-QED: from spin-photon waves to many-body spectroscopy\, Andreas Kurcz\ , Alejandro Bermudez\, Juan José Garcìa-Ripoll\, Phys. Rev. Lett. 112\, 180405 (2014) \n\nHost: Chris Monroe\n\nJoin with Google Hangouts: https:/ /hangouts.google.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwY Tc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.t7t0mjv6mo204 nkpkj6pk3hq3s&hs=121 LAST-MODIFIED:20140819T195344Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150406T200000Z DTEND:20150406T213000Z DTSTAMP:20260828T094430Z UID:deorhm05cl8385199g8a0d96ig@google.com CREATED:20150109T165704Z DESCRIPTION:Speaker Name: Dean Robinson\n\nSpeaker Institution: UC Berkeley \n\nTitle: Galactic Center Gamma-ray Excess through a Dark Shower\n\nAbstra ct: The reported galactic center gamma-ray excess has a distribution and ra te suggestive of an origin in dark matter annihilations. However\, the conv entional DM annihilation channels into standard model b quarks or tau lepto ns are increasingly in tension with various experimental constraints on ant iproton and positron fluxes. I'll discuss a framework that is free from suc h constraints. The key idea is that the mediators between the dark matter a nd the SM are themselves part of a strongly coupled sector: a hidden valley . DM annihilation produces a dark hadron shower that in turn decays to phot ons\, but without significant associated emission of other SM matter. I'll also discuss an explicit realization of this framework\, its phenomenology\ , as well as pertinent cosmological\, astrophysical and collider bounds.\n\ nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics. umd.edu/ept-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZ W5kYXIuZ29vZ2xlLmNvbQ.deorhm05cl8385199g8a0d96ig&hs=121 LAST-MODIFIED:20150402T200622Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141111T190000Z DTEND:20141111T200000Z DTSTAMP:20260828T094430Z UID:ir8svjgc4d3pq7657t4euu0jqk@google.com CREATED:20141104T185607Z DESCRIPTION:Speaker Name: Sanli Faez\n\nSpeaker Institution: Leiden Univer sity\, The Netherlands \n\nTitle: Photons\, electrons\, molecules\, and the ir coherent coupling\n\nAbstract: The coupling of quantum emitters to a si ngle mode optical waveguide is\na powerful alternative to cavity-QED for en gineering complex quantum\nsystems. I report on the experimental realizatio n of a new solid-state\nplatform for waveguide-QED\, which uses organic mol ecules with\nlifetime-limited optical transitions as quantum emitters. I pr esent\nextinction spectra of single molecules recorded in transmission and\ nsharp bright resonance fluorescence spectra from the side.\nBased on this system\, I present a technique for mapping charge\ndistribution on the surf ace of electronic devices that exhibit Coulomb\nblockade. Given the superio r quantum coherence of these organic\nemitters\, this mapping technique set s the foundation for a solid-state\nhybrid quantum interface between a stat ionary superconducting qubit\nand a flying photon qubit.\n\n1- Faez\, S.\, Türschmann\, P.\, Haakh\, H.R.\, Götzinger\, S.\, and\nSandoghdar\, V. (201 4)\, Coherent interaction of light and single\nmolecules in a dielectric na noguide\, Phys Rev. Lett. in press.\n(arXiv:1407.2846)\n2- Faez\, S.\, van der Molen\, S.J.\, and Orrit\, M. (2014)\, Optical\ntracing of multiple cha rges in single-electron devices\, Phys Rev. B in\npress. (arXiv:1408.6977)\ n\n\n\nHost: Mohammad Hafezi\n\n\n\n\nJoin with Google Hangouts: https://ha ngouts.google.com/hangouts/_/physics.umd.edu/ireap-special?hceid=bGJrNjYwYT c1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ir8svjgc4d3pq7 657t4euu0jqk&hs=121 LAST-MODIFIED:20141104T185607Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141203T203000Z DTEND:20141203T213000Z DTSTAMP:20260828T094430Z UID:jtv9ldrdtmk6mslk20qjgbfme4@google.com CREATED:20141201T161451Z DESCRIPTION:Title : Chaotic Dynamics in the Physical Sciences\n\nSpeaker Na me: Dr. Edward Ott\, UMCP\n\nAbstract : Chaos was first discovered by Poinc are in his famous 1890 paper on the motion of three or more bodies interact ing throughgravitational attraction. Although steady progress was made by m athematicians following Poincare's work\, widespread impact and development of chaos in the physical sciences is comparatively recent. This talk will review this history and give examples illustrating the types of questions\, problems\, and results arising from perspectives growing out of the intens ive participation of physical scientists\n\nJoin with Google Hangouts: http s://hangouts.google.com/hangouts/_/physics.umd.edu/lps-seminar?hceid=bGJrNj YwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jtv9ldrdtm k6mslk20qjgbfme4&hs=121 LAST-MODIFIED:20141201T161451Z LOCATION:Lab for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141121T180000Z DTEND:20141121T190000Z DTSTAMP:20260828T094430Z UID:rhq4sil9o19tcil3iookc667u0@google.com CREATED:20141113T212651Z DESCRIPTION:Speaker Name: Margarita Herrera-Alonso\n\nSpeaker Institution: Johns Hopkins University\n\nTitle: Functional Polycarbonates as Environmen tally Responsive Materials\n\nAbstract: Organoboron polymers play important roles in biomedical applications. An ample number of monomers bearing boro nic acid derivatives have been synthesized\, particularly focusing on contr olled free radical polymerization methods. Organoboron polymers synthesized by ring- opening polymerization (ROP) routes are far less explored. We dis cuss our recent efforts on the synthesis of boronic acid-installed cyclic c arbonates by ROP and the use of these materials as polymeric prodrugs.\n\nE nvironmental responsiveness is an appealing trait of emerging polymeric mat erials\, as shown for a variety of pH responsive drug delivery systems. The chemical versatility of the conjugation site and conjugate lability to phy siologically relevant changes in pH\, will largely determine their applicab ility. We have synthesized a series of boronic acid-functionalized polycarb onates (PPBC) with high precision\, and used them for the formation of a dr ug-polymer complex with the capability to undergo pH-sensitive delivery of a diol-containing drug\, capecitabine (CAPE). Complexation of CAPE with a P EGylated- PPBC block copolymer\, via boronic ester formation\, resulted in amphiphiles capable of self- assembling into spherical nanoparticles. We ex amined nanoparticle stability and release kinetics in neutral and acidic me dia\, and relate differences in release profiles and particle stability wit h changes to polymer chemistry. Comparison of complexed nanoparticles with their non-complex analogs revealed striking differences in release rate and particle stability. Illustrated herein for capecitabine\, the pH-sensitive dissociation of boronate esters from PPBCs can be applied in a general man ner to diol- or catechol-containing solutes\, demonstrating the utility of these polymers for biomedical applications.\n\n\n\nJoin with Google Hangout s: https://hangouts.google.com/hangouts/_/physics.umd.edu/materials?hceid=b GJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.rhq4s il9o19tcil3iookc667u0&hs=121 LAST-MODIFIED:20141113T213914Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T150000Z DTEND:20150415T160000Z DTSTAMP:20260828T094430Z UID:1i7d6uh47tjemh22qr0mhr09q0@google.com CREATED:20150415T155152Z DESCRIPTION:Speaker: Carlo Beenakker (Leiden University)\n\nTitle: Quench d ynamics of fermion-parity switches in a Josephson junction\n\nAbstract: We have investigated the phase-coherent\, deterministic counterpart of incoher ent\, stochastic quasiparticle poisoning: A fermion-parity switch in a Jose phson junction transfers a single quasiparticle into a metal contact\, on d emand and in a pure state. The quasiparticle is a coherent superposition of electron and hole\, with a charge expectation value that can be adjusted b etween 0 and e. A charge-neutral quasiparticle is\nproduced in the quenched limit of a fast parity switch\, if the metal couples predominantly to a si ngle Majorana operator in the Josephson junction. This level of control ove r Bogoliubov quasiparticles could be an asset for quantum information proce ssing with superconducting electronics.\n\nHost: Jay Sau\n\nhttp://www.phys ics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150415T155152Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121025T133000 DTEND;TZID=America/New_York:20121025T140000 RRULE:FREQ=WEEKLY;UNTIL=20121206T183000Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:040000008200E00074C5B7101A82E00800000000A01BDC06B7B2CD01000000000000000 0100000006379685BED657A44B121524B8E554FDD CREATED:20121025T180528Z LAST-MODIFIED:20121127T155422Z LOCATION:Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150504T200000Z DTEND:20150504T213000Z DTSTAMP:20260828T094430Z UID:0l266jdc4nkcpvf21pm9a07o34@google.com CREATED:20150115T165009Z DESCRIPTION:Speaker Name: Ravi Kuchimanchi\n\nSpeaker Institution: Univers ity of Maryland\n\nTitle: Absence of leptonic CP violation can be evidence of left-right parity symmetry\n\nAbstract: In this talk I will show that le ptonic CP phases can radiatively generate a large strong CP phase (and henc e an excessive neutron EDM beyond current limits) in interesting regions of parameter space of the axionless minimal left-right symmetric model with parity (P). Therefore leptonic \\delta_CP may be suppressed or absent\, an d we thus obtain a way to test if parity and B-L symmetry are restored in laws of nature\, even at some scales that can be as high as 10^14 or 10^15 GeV and well beyond collider reach. I will also discuss an ultraviolet com pletion\, where the absence or suppression of both leptonic and strong CP p hases\, is a consequence of spontaneous or soft breaking of P and CP symmet ries. Further\, if nature picks this path\, there can be a dark sector who se lightest particle is stable because of P. \n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid=b GJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.0l266 jdc4nkcpvf21pm9a07o34&hs=121 LAST-MODIFIED:20150429T205432Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141030T150000Z DTEND:20141030T163000Z DTSTAMP:20260828T094430Z UID:rpk1oc2tpb827ia36hgd62f3bg@google.com CREATED:20140911T150342Z DESCRIPTION:Speaker Name: Brian Swingle\n\nSpeaker Institution: Stanford\ n\nTitle: Renormalization Group Constructions of Topological Quantum Liqui ds\n\nAbstract: I will discuss recent work with John McGreevy (1407.8203) on constructing ground state wavefunctions of general gapped Hamiltonians u sing a renormalization group approach. The formalism provides a number of r esults including a partial proof of the area law for entanglement entropy\, efficient tensor network representations for wavefunctions\, a definition of short- and long-range entanglement\, and a classification scheme which w e conjecture applies to all gapped phases. A special role is played by what we call topological quantum liquids which are gapped phases that are insen sitive to the "shape" of space (like quantum Hall fluids).\n\nHost: Jay D. Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20140911T185720Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160307T210000Z DTEND:20160307T220000Z DTSTAMP:20260828T094430Z UID:7mv1rn5m9dnlmg2hlieuojbgoo@google.com CREATED:20160301T154512Z DESCRIPTION:Speaker Name: Taekjip Ha \n\nSpeaker Institution : John Hopkins University \n\nTitle : Surprising Physics of DNA on the Genome Scale \n\nN otes: All Seminars start at 4:00 pm. Refreshments served at 3:45 pm\n LAST-MODIFIED:20160301T154623Z LOCATION:Marker Seminar room 0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160321T173000Z DTEND:20160321T190000Z DTSTAMP:20260828T094430Z UID:ueau8vidfdtpatj4hn7qqgu16g@google.com CREATED:20160303T190201Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART I (March 21\, 22\, 23) will center on the concept of "entanglement entropy" in field theory\, a measure of the information i n a region. I will describe how to calculate this quantity by various tric ks (including holographic methods)\, and spell out some applications to ren ormalization theory\, condensed matter physics\, and quantum gravity. LAST-MODIFIED:20160303T190201Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150421T171500Z DTEND:20150421T183000Z DTSTAMP:20260828T094430Z UID:ln0a5hv2e9niuovierjue3m4es@google.com CREATED:20150417T204703Z DESCRIPTION:Speaker Name: Dr. Robert DiStasio\n\nSpeaker Institution : Prin ceton University\n\nTitle : Designer Spin Systems Via Inverse Statistical M echanics\n\nAbstract : In this work\, we develop and extend the class of in verse statistical-mechanical methods to the design of spin systems. For sim plicity\, we focus on the two-state Ising model (or equivalently speaking\, the lattice gas model) with radial spin-spin interactions of finite range that extend beyond nearest-neighbor sites. Our interest is to find the opti mal set of shortest-range pair interactions within this family of Hamiltoni ans\, whose corresponding ground state is a targeted spin configuration. Th is is accomplished using a competitor-based zero-temperature optimization a lgorithm which maximizes the gap between the energetically closest competit or and the target spin configuration for an exhaustive list of competitors. As a case study\, we have investigated both striped-phase spin configurati ons\, which are comprised of alternating parallel bands of up- and down-spi ns of varying thicknesses\, and block checkerboard spin configurations\, wh ich are comprised of varying block sizes and are generalizations of the cla ssic anti-ferromagnetic Ising model. Interestingly\, our findings demonstra te that the structurally anisotropic striped phases\, in which the thicknes ses of the up- and down-spin bands are equal\, are unique ground states for isotropic short-ranged interactions. By contrast\, virtually all of the bl ock checkerboard targets are either degenerate or cannot be stabilized by r adial pair interactions. Beyond this systematic study of target spin config urations\, I will also discuss our recent investigation into the inverse de sign of "stealthy" and hyperuniform disordered two-state Ising (or lattice gas) systems--that is\, configurations which possess novel scattering prope rties and are characterized by hidden long-range order.\n\n LAST-MODIFIED:20150417T204818Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140206T183000Z DTEND:20140206T190000Z DTSTAMP:20260828T094430Z UID:9od3t1gq1qi6j693n5n8drq6og@google.com CREATED:20140131T215053Z LAST-MODIFIED:20140131T215128Z LOCATION:Phys room 1305F\; the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151120T160000Z DTEND:20151120T170000Z DTSTAMP:20260828T094430Z UID:fbeaesr85dimtai879qntutb78@google.com CREATED:20151119T202639Z DESCRIPTION:Speaker Name: Dr. Jamil Abo-Shaeer\n\nSpeaker Institution : Dir ector of Strategic Planning AOSense\, Inc.\n\nTitle : Atom-based Timing and Navigation\n\nAbstract : Atomic systems are the standard-bearers for measu rements of time\, distance\, and mass. Indeed\, many civilian- and defense- critical applications require exceptionally precise time and frequency stan dards enabled only by atomic clocks. The Global Positioning System (GPS) an d smart-grid power distribution are two key examples. Atom-based measuremen t devices benefit from the exquisite properties of the atom\, which include stable frequency transitions\, precise initialization\, control\, and read out of the atomic state\, and environmental isolation. Moreover\, atomic pr operties are absolute\, and do not drift over time. Recent laboratory-based atomic sensors promise to enable new capabilities such as GPS-free navigat ion and high-bandwidth communication. Fielding these devices\, however\, is a considerable engineering challenge that companies such as AOSense are no w actively addressing LAST-MODIFIED:20151119T202640Z LOCATION:Laboratory for Physical Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131031T163000Z DTEND:20131031T173000Z DTSTAMP:20260828T094430Z UID:4749l4iukmvg97nn0qd6mtpk8s@google.com CREATED:20131018T130117Z DESCRIPTION:Title : Applied Dyanmics Seminar: Ensemble methods for Lyapunov exponents and data assimilation\n\nSpeaker Name: Prof. Brian Hunt\n\nSpeak er Institution : UMD\n LAST-MODIFIED:20131018T130330Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140312T150000Z DTEND:20140312T160000Z DTSTAMP:20260828T094430Z UID:2b71vn0vc5a1qbob300evn7h7s@google.com CREATED:20140310T184642Z DESCRIPTION:Speaker: Donald Fahey\n\nInstitution: Bryn Mawr College \n\nTit le: "Dipole-Dipole Interactions Among Ultracold Rydberg Atoms". \n\nAbstra ct: For microsecond timescales\, the dipole-dipole interaction is the domin ant mechanism for energy exchange among atoms in an ultracold gas of highly excited neutral atoms\, or Rydberg atoms. By applying a dc electric field it is possible to tune these energy exchange processes into resonance via the Stark effect. I will explore some of the interesting dynamics the can result from these field tuned resonant interactions. Recent experiments wi ll also be discussed\, such as the direct imaging of the dipole-dipole inte raction using a spatially sensitive ion detector\, as well as possible inte rference in the resonant energy exchange process when atoms are prepared in coherent superposition states.\n\nHost: Paul Lett\n LAST-MODIFIED:20140311T134045Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140408T180000Z DTEND:20140408T190000Z DTSTAMP:20260828T094430Z UID:v5kpeg314ams35coum16s3o5q8@google.com CREATED:20140407T191824Z DESCRIPTION:Speaker: Sergio Boixo (Quantum Artificial Intelligence Laborato ry\, Google)\n\nTitle: Experiments with the D-Wave Prototype\n\nAbstract: Q uantum annealing is an optimization method designed to take advantage of qu antum phenomena\, such as quantum superposition\, tunneling and quantum flu ctuations. Diabatic transactions between energy levels\, and thermal excita tions and relaxation\, can play an important role in quantum annealing (as opposed to adiabatic quantum computation). DWave has implemented a physical quantum annealing prototype with up to 512 qubits. The decoherence time sc ale in this device is much shorter than the annealing time. I will review r ecent work done in this prototype. On the one hand\, we find evidence of en tanglement within eight superconducting flux qubits. On the other hand\, w e find no evidence of a quantum speedup for the case of random Ising glasse s when the entire data set is considered\, and obtain inconclusive results when comparing subsets of problems on an instance-by-instance basis. I will present preliminary new results on correlations between the DWave prototyp e and several high level numerical models.\n\nHost: Chris Monroe LAST-MODIFIED:20140407T191824Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140424T180000Z DTEND:20140424T193000Z DTSTAMP:20260828T094430Z UID:kbh98opsuoon43kbbuiphvdk2c@google.com CREATED:20140329T185536Z DESCRIPTION:Speaker: Jonathan Denlinger\, Advanced Light Source\, Lawrence Berkeley\nNational Laboratory\n\nTitle: Thermal gap destabilization and th e fate of topologically protected surface states in the mixed valent insula tor SmB6\n\nAbstract: The paradigm mixed-valent insulator SmB_6 has experi enced recent renewed\ninterest coming from the prediction of the existence of topological surface states arising from the inversion of f and d-bands a t the X-point\, and from transport measurements giving evidence for surface conductivity at low temperatures. The existence of such surface states\nwo uld provide an explanation for a 30 year puzzle as to the origin of “in-gap ” states causing a metallic resistivity saturation below 4K. In this work a ngle-resolved photoemission on cleaved <100> surfaces provides the first ex perimental view of the X-point conduction band\, the T-dependent destabiliz ation of the many-body hybridization gap and the intimately connected fate of the topologically protected X-point surface\nstates that reside in the g ap [1]. The T-dependent evolution of the bulk states compares very well wit h bulk transport properties and the qualitative implications of DFT+DMFT ca lculations.But presently there is no such theory for the surface states.Spa tial variations of the surface state properties and the extent of their rob ustness on inhomogeneous\ncleaved surfaces arising from large charge polari ty differences between Sm- and B-terminated regions is also presented [2].\ n\n[1] J.D. Denlinger\, et al.\, /arXiv/:1336.6637\; \n[2] J.D. Denlinger\, et al. /arXiv/:1336:6636.\n\nHosts: J. Paglione & N. Butch LAST-MODIFIED:20140329T185536Z LOCATION:Phys Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160229T210000Z DTEND:20160229T223000Z DTSTAMP:20260828T094430Z UID:7o6q0d5dfqaau7avoccbls622c@google.com CREATED:20160217T154704Z DESCRIPTION:Speaker: Yanou Cui\n\nSpeaker Institution: Perimeter Institute\ n\nTitle: Probing the Cosmic Origins of Matter: New Insights and New Search Strategies\n\nAbstract: I will review the prominent puzzles about the cosm ic origins of atomic matter and dark matter\, and discuss new theoretical i nsights/ideas to address these puzzles. The discussion will include the pos sible connections between these theories and the new energy frontier of par ticle physics\, as well as more general considerations. I will also demonst rate the rich observational predictions from these theories that can have i mpact on a variety of current/future particle physics experiments\, such as the Large Hadron Collider\, neutrino detectors and Cosmic Microwave Backgr ound measurements. LAST-MODIFIED:20160218T141545Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150316T180000Z DTEND:20150316T190000Z DTSTAMP:20260828T094430Z UID:o3s89c23laru7qtitdfgiq74l4@google.com CREATED:20150130T125124Z DESCRIPTION:Speaker Name: Mark Fischer\n\nSpeaker Institution: Weizmann Ins titute of Science\n\nTitle: A macroscopic 'order parameter' for many-body l ocalization\n\nAbstract: Recent theoretical progress in characterizing many -body localized systems has not been confronted so far with an experimental test. I will present a theoretical analysis of new experimental results sh owing many-body localization of interacting fermions in a quasi periodic o ptical lattice potential (arXiv:1501.05661). Specifically we considered the time evolution of a system prepared in a particular many-body initial stat e\, a charge-density wave. Relaxation of the density-wave to a non-vanishin g value at long times provides a direct demonstration of the breakdown of e rgodicity in the many-body localized state and the saturation value can ser ve as an order parameter of this state. We found this stationary density wa ve order to show a distinctive dependence on the interaction strength\, in agreement with experiment. Moreover\, I will discuss how (temporal) fluctua tions in this order parameter are connected to the entanglement-entropy gro wth\, thus providing a distinguishing signature that could be observed in f uture experiments. LAST-MODIFIED:20150130T142551Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160324T180000Z DTEND:20160324T193000Z DTSTAMP:20260828T094430Z UID:8ss5tcmu8545v2bbnqkgcoti18@google.com CREATED:20160320T185846Z DESCRIPTION:Speaker Name: Rafael M. Fernandes\n\nSpeaker Institution: Univ ersity of Minnesota \n\nTitle: Magnetism without tetragonal symmetry-break ing in iron-based superconductors\n\nAbstract: The proximity of supercondu ctivity to a magnetic instability is a common feature of many unconventiona l superconductors. As a result\, elucidating the origin and the properties of the magnetic state is an important step to advance our understanding of these materials. In most iron-based materials\, superconductivity appears u pon suppression of a stripe-orthorhombic magnetic state\, in which spins al ign parallel to each other along one in-plane direction and anti-parallel t o each other along the other direction. Recent experiments in hole-doped ma terials\, however\, revealed a novel magnetic ground state that remains tet ragonal and is inconsistent with spin stripes. More interestingly\, this no vel tetragonal magnetic phase appears close to optimal doping\, where the s uperconducting transition temperature is the highest. In this talk\, we wil l show that this tetragonal magnetic state can be explained as a double-Q o rder that arises naturally from an itinerant microscopic description of the se materials\, and is incompatible with localized spins. Two types of doubl e-Q order are discussed\, displaying either a non-uniform magnetization (ca lled charge-spin density-wave) or a non-collinear magnetization (called a s pin-vortex crystal). Upon increasing the temperature\, we show that both te tragonal phases melt in a two-stage process\, giving rise to “vestigial” pa ramagnetic phases that display unusual charge and chiral orders. While fluc tuations of these vestigial electronic phases may enhance the superconducti ng transition temperature\, we show that long-range tetragonal magnetic ord er competes more strongly with superconductivity than the stripe orthorhomb ic magnetic order.\n\nHOST: Johnpierre Paglione\n LAST-MODIFIED:20160321T150129Z LOCATION:John S Toll Physics Building\, Room 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Rafael M. Fernandes\, University of Minnesota TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140423T180000Z DTEND:20140423T190000Z DTSTAMP:20260828T094430Z UID:mrpft9tg3tr59jtp0jocooa3l0@google.com CREATED:20140404T153908Z DESCRIPTION:Speaker Name: Russell Bisset\n \nSpeaker Institution: Los Alam os National Laboratory\n \nAbstract: An important feature of the alkali a toms typically used for weakly interacting Bose-Einstein condensates is tha t their interactions are short-ranged and can be well-approximated by a con tact interaction. In 2005 the Stuttgart group obtained the first BEC of chr omium\, a system with an important new feature: Ground state chromium atoms have a large magnetic dipole moment leading to an appreciable dipole-dipol e interaction. These interactions are long-ranged and anisotropic\, and a r ange of new physics is expected to arise. Recently\, there were a number of breakthroughs with the condensation of dipolar erbium and dysprosium atoms . There has also been considerable progress towards the production of quant um degenerate polar molecules with large electric dipoles.\n\nIn this talk I will review some of the interesting experimental and theoretical work on dipolar systems. Of particular interest is that\, in the pancake trap\, a m omentum dependence of the interaction is predicted which may even lead to a new kind of (weakly interacting) roton. This roton has not been observed e xperimentally and I will discuss our work that predicts its dramatic manife station in the density fluctuations. These effects should be observable in current experiments with recent advances in imaging (e.g. the quantum gas m icroscope).\n\nHost: Ryan Wilson\n LAST-MODIFIED:20140417T203542Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141110T213000Z DTEND:20141110T223000Z DTSTAMP:20260828T094430Z UID:d5ck2onpl7rhsj08069l5084h4@google.com CREATED:20141013T175701Z DESCRIPTION:Speaker Name: Marc Swisdak\n\nSpeaker Institution : University of Maryland\n\nTitle: Double Layers\, Electron Heat Flux Suppression\, Driv ing the Solar Wind\n\nAbstract: Observations of flare-heated electrons in the corona typically suggest they are confined near the looptop. The confin ement mechanism\, however\, remains unclear. We have recently found that tr ansport into the ambient plasma is significantly suppressed by the formatio n of highly localized\, nonlinear electrostatic structures in the form of d ouble layers (DLs). We will discuss the formation of these DLs and their be havior\, as well as how they suppress transport and accelerate ambient ions . The latter process clarifies the mechanism by which hot electrons in the corona could couple to and accelerate ions to form the solar wind.\n\nNotes : Coffee\, Tea & Cookies 4:15-4:30 PM\n\nJoin with Google Hangouts: https: //hangouts.google.com/hangouts/_/physics.umd.edu/lbk660a75b8jh7e?hceid=bGJr NjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.d5ck2onp l7rhsj08069l5084h4&hs=121 LAST-MODIFIED:20141031T181915Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150511T200000Z DTEND:20150511T210000Z DTSTAMP:20260828T094430Z UID:4rpud9qme5hq5bkit7fsund2i8@google.com CREATED:20150504T195735Z DESCRIPTION:Speaker Name: Julio Freedman\n\nSpeaker Institution: Principal Deputy Assistant Secretary Clean Coal and Carbon Management\, U.S. Departme nt of Energy\n\nTitle: The Future of Fossil Energy in a Carbon Constrained World\n\nAbstract: Fossil Fuels have re-emerged as a critical component of the US and global energy economy\, including advances in unconventional oil and gas production\, increased coal use world-wide\, and geopolitical even ts. Similarly\, increased fossil fuel abundance and use has increased carbo n pollution and highlighted the need for global action to manage the challe nges presented by climate change. In this changing landscape\, advanced tec hnology options present opportunities to dramatically reduce the environmen tal challenges from fossil-fuel use\, as well as provide pathways to an ene rgy-rich\, low-carbon future. At this Transforming Energy Lecture\, Dr. Fri edmann will discuss current and emerging technologies to help manage the ri sks posed by fossil fuel use.\n\nBiography\nDr. Julio Friedmann serves as D eputy Assistant Secretary for Clean Coal and Carbon Management in the Offic e of Fossil Energy\, Department of Energy. He has over 15 years of experie nce on a broad spectrum of energy issues\, most recently focusing on carbon capture\, utilization and sequestration and fossil energy conversion. Pri or to his appointment as Deputy Assistant Secretary\, Dr. Friedmann was the Chief Energy Technologist at the Lawrence Livermore National Lab\, coordin ating and managing energy research programs across the Lab. He has a Bache lor of Science and Master of Science from the Massachusetts Institute of Te chnology and a PhD in Geology from the University of Southern California. LAST-MODIFIED:20150507T145429Z LOCATION:1202 Martin Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Energy Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141003T170000Z DTEND:20141003T180000Z DTSTAMP:20260828T094430Z UID:6hcn7p6bak1ld5a5o7gfl4ivlg@google.com CREATED:20140929T171311Z DESCRIPTION:Speaker Name: Renu Sharma\n\nSpeaker Institution : NIST Center for Nanoscale Science and Technology\n\nTitle : Correlative Microscopy for In Situ Characterization of Catalyst Nanoparticles Under Reactive Environm ents\n\nAbstract : In recent years the environmental transmission scanning electron microscope (ESTEM) has been successfully employed to elucidate the structural and chemical changes occurring in the catalyst nanoparticles un der reactive environments. While atomic-resolution images and the combinati on of high spatial and energy resolution is ideally suited to distinguish b etween active and inactive catalyst particles and identify active surfaces for gas adsorption\, unambiguous data can only obtained from the area under observation. This lack of statistical information available from TEM measu rements is generally compensated for by using other\, ensemble measurement techniques such as x-ray or neutron diffraction\, x-ray photoelectron spect roscopy\, infrared spectroscopy\, Raman spectroscopy etc. However\, it is almost impossible to create identical experimental conditions in two separa te instruments to make measurements that can be directly compared. Moreover \, ambiguities in ESTEM studies may arise from the unknown effects of the i ncident electron beam and uncertainty of the sample temperature. We have d esigned and built a unique platform that allows us to concurrently measure atomic-scale and micro-scale changes occurring in samples subjected to iden tical reactive environmental conditions by incorporating a Raman Spectromet er on the ESTEM. We have used this correlative microscopy platform i) to m easure the temperature from 60 µm2 area using Raman shifts\, ii) to investi gate light/matter interactions iii) as a heating source\, iii) for concurre nt optical and electron spectroscopy such as cathodoluminescence\, EELS and Raman. Details of the design\, function\, and capabilities will be illustr ated with results obtained from in situ combinatorial measurements.\n\n\n\n Join with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.u md.edu/department-of?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2Fs ZW5kYXIuZ29vZ2xlLmNvbQ.6hcn7p6bak1ld5a5o7gfl4ivlg&hs=121 LAST-MODIFIED:20140929T171311Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141023T173000Z DTEND:20141023T180000Z DTSTAMP:20260828T094430Z UID:ulfea5c12k46v2bv9qk4g6882g@google.com CREATED:20140828T215041Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ulfea5c12k46v2bv9qk4g6882g&hs=121 LAST-MODIFIED:20140828T215041Z LOCATION:physics room 1201\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150316T200000Z DTEND:20150316T210000Z DTSTAMP:20260828T094430Z UID:i58oco0kcdvbserrrj0vmr6jos@google.com CREATED:20150304T210515Z LAST-MODIFIED:20150304T210518Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Biophysics Seminar today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120224T180000Z DTEND:20120224T190000Z DTSTAMP:20260828T094430Z UID:d4eqhcm594qj4gskmj2fuicj00@google.com CREATED:20120215T161131Z DESCRIPTION:Title : New Opportunities for Neutron Scattering at the NIST Ce nter for Neutron Research\nSpeaker Name: Richard Ibberson\nSpeaker Institut ion : NIST\nAbstract : The NIST Center for Neutron Research is in the final year of an Expansion Initiative to increase its cold neutron measurement c apability by more than 25 percent by installing a new cold source and new b eamlines\, and set the foundation for a new generation of world-class instr uments directly supporting the needs of science and industry. Recent Initia tive activities at the NCNR including the specification and installation of a new guide suite and developments in detectors and novel instrumentation will be discussed in some detail\, particularly as it relates to new scienc e opportunities and user activity. LAST-MODIFIED:20120215T161138Z LOCATION:2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150311T150000Z DTEND:20150311T163000Z DTSTAMP:20260828T094430Z UID:6n6eh6vudrhnnkavco15st2m44@google.com CREATED:20150227T143613Z DESCRIPTION:Speaker: Raquel Queiroz (Max Planck Institute\, Stuttgart)\n\nT itle: Strongly disordered topological superconductors without inversion cen ter\n\nAbstract: Noncentrosymmetric superconductors with strong spin-orbit coupling and the B phase of He-3 are possible realizations of topological s uperconductors with time-reversal symmetry. The nontrivial topology manifes ts itself at the material’s surface in terms of surface bound states\, stro ngly dependent on the momentum dependence of the order parameter. We show t hat disorder can be a useful tool to experimentally identify and distinguis h different types of surface states\, and\, using extensive numerical simul ations\, we investigate the stability and properties of such states under s trong surface disorder\, influencing both bulk and surface states.\n\nOf pa rticular interest are the linearly dispersive helical Majorana modes of ful ly gapped superconductors\, protected from disorder weaker than the superco nducting gap. A critical crossover from weak to strong disorder is observed in both two and three dimensions\, through which an extended state exactly at zero energy always persists. We contrast these results with the linear dispersive surface states of Z2 topological insulators. \n\nHost: Philip Br ydon\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20150227T143613Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160401T160000Z DTEND:20160401T170000Z DTSTAMP:20260828T094430Z UID:nkb15h0m50dl7tv4srt9snlap8@google.com CLASS:PUBLIC CREATED:20160325T140712Z DESCRIPTION:Speaker: Dr. Cedric Lin\n\nInstitution: QuICS\n\n(Free lunch se rved at 12:00)\n\nTitle: The computational complexity of calculating ground state energies to very high precision\n\nAbstract: Computational complexit y theory studies the classification of computational problems according to the resources required to solve them. An important problem in quantum compl exity theory is the local Hamiltonian problem - given a Hamiltonian compose d of local terms\, determine its ground state energy up to polynomial preci sion.\n\nWe characterize the complexity of a variant local Hamiltonian prob lem where exponential precision\, instead of polynomial precision\, is requ ired. In particular\, this problem exactly captures the difficulty of probl ems solvable in a reasonable amount of memory (but with no other constraint s). Our result gives some evidence that projected entangled pair states (PE PS) are less computationally useful than general ground states.\n\nNo knowl edge of complexity theory will be assumed. Based on joint work with Bill Fe fferman. LAST-MODIFIED:20160325T140712Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160225T173000Z DTEND:20160225T183000Z DTSTAMP:20260828T094430Z UID:jqsu8ito0jtlvva7d3fbi0qi4s@google.com CREATED:20160217T154840Z DESCRIPTION:Title: Two talks: Universal energy diffusion in a quivering bil liard (talk #1) and Shortcuts to adibaticity for a quantum tilted piston (t alk #2)\nSpeaker: Jeff Demers (speaker #1) and Ayoti Patra (speaker #2)\, b oth from UMD/IPST/Chemistry\n LAST-MODIFIED:20160222T143124Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140219T210000Z DTEND:20140219T220000Z DTSTAMP:20260828T094430Z UID:rppbanmjp1p4j1qgnvu6r1l4eg@google.com CREATED:20140210T204109Z DESCRIPTION:Speaker Name: Dr. Christopher Rogan\n\nSpeaker Institution : Ha rvard University\n\nTitle : Kinematic Variables for Weakly Interact- ing Pa rticle Final State Reconstruction at the LHC\n\nAbstract : At the Large Had ron Collider (LHC)\, many new physics signatures feature pair-production of massive particles with subsequent direct or cascading de- cays to weakly i nteracting particles\, such as SUSY scenarios with conserved R-parity or H → W(lν)W(lν)\, often motivated by models of new physics which attempt to mi tigate the hierarchy problem in the Standard Model. While final states cont aining multiple weakly interacting particles represent an opportunity for d iscovery of new physics phenomena\, they also present a unique experimental challenge\; the kinematic information lost through par- ticles escaping de tection makes fully reconstructing these collision events im- possible. In order to address this shortcoming special kinematic variables are used to p artially reconstruct these events\, providing sensitivity to prop- erties o f the particles appearing in them\, including masses and even their spin co rrelations.\nWe discuss a collection kinematic variables developed to study final states with weakly interacting particles at the LHC\, focusing on th e super-razor variables. Using the examples of slepton pair-production at t he LHC\, the motivation and derivation of these observables are described a long with com- parisons to previously existing approaches. Generalizations of the super-razor variables to more complicated decay topologies are also discussed\, using fully leptonic top quark pair production as an example\, along with its supersym- metric analogue of stop pair-production with subse quent decays to b-quarks and charginos.\n LAST-MODIFIED:20140210T205240Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141119T160000Z DTEND:20141119T210000Z DTSTAMP:20260828T094430Z UID:madl1p9eu45m7trpbsb8pkgt8s@google.com CREATED:20141020T213724Z DESCRIPTION:Talk schedule:\n\n11:00 AM Johannes Hofmann\, Electron interac tions in Dirac materials\n\n11:45 AM Bitan Roy\, Theory of interacting sur face states in cubic topological Kondo insulators\n\n1:30 PM Valentin Stan ev\, Quasiclassical theory of p-wave nanowires\n\n2:15 PM Robert Throckmor ton\, Quantum Multicriticality in Bilayer Graphene in the Presence of an Ap plied Electric Field\n\n3:00 PM Justin Wilson\, Repulsive Casimir effect b etween Weyl Semimetals\n\n\nThe entire talk schedule can be found at http:/ /www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20141020T213724Z LOCATION:PHY 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 5 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20151123T200000Z DTEND:20151123T213000Z DTSTAMP:20260828T094430Z UID:pdf1gt8teplj0hhmmvcl3in78g@google.com CREATED:20151120T191814Z DESCRIPTION:Speaker: Raphael Flauger\n\nSpeaker Institution: University of Texas at Austin\n\nTitle: From the CMB to Strings and Back\n\nAbstract: The cosmic microwave background contains a wealth of information about cosmolo gy as well as high energy physics. It tells us about the composition and ge ometry of the universe\, the properties of neutrinos\, dark matter. Quite r emarkably\, it even tells us about the conditions in our universe long befo re the cosmic microwave background was emitted. After an introduction to CM B measurements\, I will give a brief explanation why measurements of the CM B provide a window into the earliest moments of our universe. I will then d iscuss string inspired models of inflation and the search for their signatu res. Finally\, I will turn to the search for primordial B-modes.\n\nJoin wi th Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ 29vZ2xlLmNvbQ.pdf1gt8teplj0hhmmvcl3in78g&hs=121 LAST-MODIFIED:20151120T195852Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160215T200000Z DTEND:20160215T213000Z DTSTAMP:20260828T094430Z UID:6hr20o9ro0ca0m4f0j1rhumnck@google.com CLASS:PUBLIC CREATED:20160129T131434Z DESCRIPTION:Speaker Name: Wonho Jhe\n\nSpeaker Institution: Seoul National University\n\nTitle: Nonequilibrium Nonlinear Dynamics and Phase Transition in a Periodically Modulated Atomic Trap\n\nAbstract: Mean-field approach has been instrumental for developing an insight into critical phenomena. H owever\, close to the phase transition point the mean field approximation u sually breaks down because of enhanced spatial fluctuation. Here we report an observation of an ideal mean-field symmetry breaking transition and the associated critical behavior. The transition occurs in an atomic cloud conf ined in a periodically modulated magneto-optical trap once the number of at oms reaches a critical value. In the symmetric phase\, the atoms equally oc cupy two parametrically excited vibrational states with opposite phase. As a result of the transition\, the state occupations become different. This i s symmetry breaking in time rather than in space. It is due to the interato mic interaction and is mediated by nonequilibrium fluctuations. The measure d critical exponents show that this transition is the ideal mean-field tran sition which has been considered physically not feasible. The results demon strate that an ideal mean-field transition can occur in a many-body system and moreover that the notion of discrete symmetry breaking transitions can be extended to the time domain. LAST-MODIFIED:20160129T195843Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141106T203000Z DTEND:20141106T213000Z DTSTAMP:20260828T094430Z UID:5u4qhq0qjjp3vo1gdqiggjs36g@google.com CREATED:20141031T195820Z DESCRIPTION:Speaker: Jim Gates (UMd) - http://umdphysics.umd.edu/about-us/p eople/faculty/135-gates.html\nAbstract: We will discuss the supersymmetric harmonic oscillator in detail\, in an attempt to arrive at a mathematical t heory of supersymmetry that includes the most important physical examples.\ n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physic s.umd.edu/the?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXI uZ29vZ2xlLmNvbQ.5u4qhq0qjjp3vo1gdqiggjs36g&hs=121 LAST-MODIFIED:20141031T195820Z LOCATION:Physics 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The supersymmetric harmonic oscillator TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140218T160000Z DTEND:20140218T173000Z DTSTAMP:20260828T094430Z UID:l315tisva79eopao7viruopms4@google.com CREATED:20140114T155039Z DESCRIPTION:Speaker: Leonid Levitov (MIT)\n\nTitle: Atomic collapse in gra phene\n\nAbstract: Since the discovery that electrons in graphene behave as massless Dirac fermions\, the single-atom-thick material has become a fert ile playground for testing exotic predictions of quantum electrodynamics\, such as Klein tunneling and the fractional quantum Hall effect. Now add to that list atomic collapse\, the spontaneous formation of electrons and posi trons in the electrostatic field of a superheavy atomic nucleus. The atomic collapse was predicted to manifest itself in quasistationary states which have complex-valued energies and which decay rapidly. However\, the atoms c reated artificially in laboratory have nuclear charge only up to Z = 118\, which falls short of the predicted threshold for collapse\, Interest in thi s problem has been revived with the advent of graphene\, where because of a large fine structure constant the collapse is expected for Z of order unit y. In this talk we will discuss the symmetry aspects of atomic collapse\, i n particular the anomalous breaking of scale invariance. We will also descr ibe recent experiments that use scanning tunneling microscopy (STM) to prob e atomic collapse near STM-controlled artificial compound nuclei.\n\nHost: Ed Barnes\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140211T125237Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20121116T140000Z DTEND:20121116T220000Z DTSTAMP:20260828T094430Z UID:tlt433gb17jn8tse8l3t1thu98@google.com CREATED:20121008T202621Z DESCRIPTION:Electronic RSVP is required for attendance to the symposium due to limited space availability. Please register at http://ter.ps/mcdonald if you plan to attend.\n \nPlease direct questions to Debbie Jenkins (dajen kin@umd.edu) or Michael Coplan (coplan@umd.edu) LAST-MODIFIED:20121008T202707Z LOCATION:Clubhouse at Mulligan's Grill SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Frank B. McDonald Memorial Sympsium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141009T180000Z DTEND:20141009T193000Z DTSTAMP:20260828T094430Z UID:p9elqd6sqt2ejoigslsb6ooto4@google.com CREATED:20140828T214415Z DESCRIPTION:Speaker: Dr. Andrew Wray\, NYU\n\nTitle: Measuring atomic-scal e wavefunctions and dynamics inside the hidden order compound URu2Si2 with X-ray spectroscopies\n\nAbstract: Understanding the emergent wavefunctions of correlated electron systems requires experimental probes that can resolv e electronic states on an atomic scale. However\, imaging techniques such as STM that resolve single atoms do not provide a good way to distinguish t he entangled symmetries of nearby electrons. I will talk about how energy- resolved scattering measurements performed with resonance-tuned X-rays can open a unique window into many-body entangled states on an atomic length sc ale and femtosecond time scale. The presentation will focus on data that un veil entangled wavefunction symmetries and energetics of uranium electrons in the "hidden order" compound URu2Si2\, as well as touching on other mater ial systems of current interest.\n\nHost: Dr. James Williams\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/cna m-condensed?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ 29vZ2xlLmNvbQ.p9elqd6sqt2ejoigslsb6ooto4&hs=121 LAST-MODIFIED:20141003T174625Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150514T200000Z DTEND:20150514T213000Z DTSTAMP:20260828T094430Z UID:8gs6ta3rnj4is1nuj90m2qvpng@google.com CREATED:20150330T131306Z DESCRIPTION:Speaker Name: Prof. Markus Luty\n\nSpeaker Institution: Univers ity of California\, Davis\n\nTitle: Non-decoupling new physics and induced electroweak symmetry breaking\n\nAbstract: The discovery of the 125 GeV Hig gs particle and fact that\nits measured couplings agree with the prediction s of the standard\nmodel is widely believed to have established that the ef fective theory\nthat describes our world is the Standard Model with the add ition of\nhigher-dimension operators. I point out that this lore is violate d by\nnon-decoupling effects. I discuss in detail the example of induced\ne lectroweak symmetry breaking\, which is well-motivated (by the SUSY\nnatura lness problem) and phenomenologically interesting. LAST-MODIFIED:20150513T181709Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141014T150000Z DTEND:20141014T163000Z DTSTAMP:20260828T094430Z UID:il0du4brb1q39j1u4bv7mlba94@google.com CREATED:20140929T142524Z DESCRIPTION:Speaker: Jainendra Jain (Penn State)\n\nTitle: 25 Years of Co mposite Fermions\n\nAbstract: The fractional quantum Hall effect is one of the most amazing emergent phenomena resulting from interactions. Many of i ts features are securely understood in terms of topological particles calle d composite fermions\, which are bound states of electrons and quantized vo rtices. After a review of composite fermions and their defining features\, I will report on recent progress on subtle phenomena that arise from a weak residual interaction between composite fermions\, with include paired stat es\, fractional quantum Hall states\, spin physics\, and quantum crystals o f composite fermions. \n\nHost: Sankar Das Sarma\n\nhttp://www.physics.umd .edu/cmtc/seminars.html\n LAST-MODIFIED:20140929T142524Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140915T150000Z DTEND:20140915T160000Z DTSTAMP:20260828T094430Z UID:npq47ob9dh5rooem11ike02i5s@google.com CREATED:20140711T170128Z DESCRIPTION:Speaker Name: Michal Lipson\n\nSpeaker Institution: Cornell\n\n Title: The Optical Spice Rack\n\nAbstract: Silicon is evolving as a vers atile photonic platform with multiple functionalities that can be seamlessl y integrated. The tool box is rich starting from the ability to guide and a mplify multiple wavelength sources at GHz bandwidths\, to optomechanical ME MS and opto-fluidics devices. As an example of novel device capabilities\, I will discuss the generation of strong optical forces in these ultra small light confining structures. We have recently shown that optical forces can enable controllable\, static manipulation of photonic structures\, an impo rtant step towards enabling recently proposed functionalities for optomecha nical devices\, such as self-aligning and optical corralling behaviour. The se advances should enable future micro-optomechanical systems (MOMS) with n ovel and distinct functionalities.\n\nHost: Luis Orozco\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-speci al?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLm NvbQ.npq47ob9dh5rooem11ike02i5s&hs=121 LAST-MODIFIED:20140911T184500Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20150928T110000 DTEND;TZID=America/New_York:20150928T120000 DTSTAMP:20260828T094430Z UID:vom42s417ccn65567najhoepp8@google.com RECURRENCE-ID;TZID=America/New_York:20150928T110000 CLASS:PUBLIC CREATED:20150708T144414Z DESCRIPTION:Speaker: Seth Lloyd\; MIT \n\nTitle: Universal deep quantum lea rning\n\nAbstract: Quantum systems can generate non-classical correlations that can't be generated by classical systems. This talk investigates whet her quantum devices can recognize patterns that can't be recognized classic ally. Deep quantum learning architectures are compared with deep classic al learning architectures\, and conditions are identified under which unive rsal deep quantum learners can recognize patterns that can't be recognized by classical learners. LAST-MODIFIED:20150910T152556Z LOCATION:3501 University Blvd E\, Hyattsville\, MD 20783 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140924T193000Z DTEND:20140924T203000Z DTSTAMP:20260828T094430Z UID:csunchc3esk951qc5p0kf9blvc@google.com CREATED:20140918T135506Z DESCRIPTION:Speaker Name: Dr. Alison Flatau and Dr. Bethanie J. Stadler\n\n Speaker Institution : UMCP and UMN\n\nTitle: Magnetostrictive multilayered Fe-Ga/Cu nanowires\n\nAbstract : Iron-gallium alloys known as Galfenol\, F e100−xGax\, 10 ≤ x ≤ 25 at.% have been investigated due to their unique com bination of magnetostrictive properties (elongations of ~300-400 ppm) and m echanical properties (high elastic modulus and tensile strength). They are known as the first of the class of structural magnetostrictive alloys and a re being considered for use in next generation sensors\, actuators\, energy harvesting devices and even biological applications. In this presentation\ , we focus on magnetostriction in nanowires (NW) of these alloys fabricated using electrodeposition methods. We fabricate the nanowires as multilayer ed structures with alternating Fe-Ga and Cu segments to minimize the relati ve magnitude of the contribution of shape anisotropy to magnetic domain ali gnment. Results showing magnetic properties will be presented and nanowire s attributes characterized (magnetization process\, magnetization rotation and hysteresis). The presentation will include results from a recently deve loped characterization method showing measurement of the dimensions of an i ndividual NW as it changes with induced magnetization as well as utilizing an NW array as a pressure sensing element. On-going investigations into a c oncept for using the nanowires fabricated using these methods to develop ma gnetic sensor arrays for one-pass two-dimensional magnetic recording media will also be introduced.\n\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.csunchc3esk951qc5p0kf9blvc&hs= 121 LAST-MODIFIED:20140918T135755Z LOCATION:Lab for Physical Sceinces SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160208T210000Z DTEND:20160208T223000Z DTSTAMP:20260828T094430Z UID:sb4bfe9pddte9rujr6bd7ohnm8@google.com CREATED:20160202T194911Z DESCRIPTION:Speaker: David Curtin\n\nSpeaker Institution: University of Mar yland \n \nTitle: Exploring the Cosmological Frontier with High Energy Coll iders\n \nAbstract: By probing high energies and tiny distances\, colliders like the LHC give us access to conditions that were last prevalent in the very early universe. Studies of the Higgs boson may allow us to discern the nature of the electroweak phase transition\, which depends on the detailed shape of the Higgs potential away from our vacuum\, as well as the possibl e existence of new\, as yet undiscovered particles. This could answer the l ong-standing question of whether the electroweak phase transition is respon sible for creating the matter-antimattter asymmetry of our universe. I will show how collider searches shed light on these questions and demonstrate t he explicit connections between experiments today and conditions in the ear ly universe. Significant progress has already been made at the LHC\, but ex haustively probing the electroweak phase transition will require proposed f uture colliders\, especially a possible 100 TeV pp machine that may be buil t by either CERN or China in the coming decades. LAST-MODIFIED:20160202T200338Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141106T190000Z DTEND:20141106T203000Z DTSTAMP:20260828T094430Z UID:1qaktcbvqnauf2cc3tdkmiu1sk@google.com CREATED:20141030T161618Z DESCRIPTION:SPEAKER: David Hsieh\, CalTech\n\nTITLE: Search for novel qua ntum phases in 5d transition metal oxides using nonlinear optics\n\nABSTRAC T: Recently there is growing interest to understand whether fundamentally new quantum phases can emerge when strong electron correlations and spin-or bit coupling occur on comparable energy scales in the same material. Rapid advances in the synthesis of 5d transition metal oxides now present an unpr ecedented opportunity to experimentally address the physics of this unique parameter regime. \nIn this talk\, I will focus on the perovskite iridate Sr2IrO4\, which has been studied particularly intensively due to its novel Jeff = ½ magnetic Mott insulating ground state and potential for high-Tc s uperconductivity upon doping. I will describe how nonlinear optical spectro scopy and microscopy measurements have the unique capability to determine t he symmetries of both its lattice and electronically ordered phases and spa tially resolve their domain distribution. I will discuss our recent results that explain the perfect magneto-elastic locking in Sr2IrO4 and our observ ation of a strange hidden phase that has until now eluded other probes. \n\ nHOST: James Williams\n\n\nJoin with Google Hangouts: https://hangouts.goog le.com/hangouts/_/physics.umd.edu/msutton2?hceid=bGJrNjYwYTc1YjhqaDdlazZqcj g0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.1qaktcbvqnauf2cc3tdkmiu1sk&hs= 121 LAST-MODIFIED:20141030T161735Z LOCATION:Room 1201\, Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150921T190000Z DTEND:20150921T203000Z DTSTAMP:20260828T094430Z UID:gqcoggf4gmpn6vd19p5kjle880@google.com CREATED:20150916T134349Z DESCRIPTION:Speaker: Bogdan Dobrescu\n\nSpeaker Institution: Fermilab\n\nTi tle: "A W-prime boson at 2 TeV"\n\nAbstract: The LHC data analyzed by the C MS and ATLAS Collaborations includes some\nhints for the existence of a W-p rime boson of mass near 2 TeV. I will show that an\nSU(2)_L x SU(2)_R x U(1 ) gauge theory can explain these hints by providing the correct\ncross sect ions in several channels. The CMS eejj events\, in particular\, are consist ent with\nan interesting flavor symmetry in the leptonic sector.\n\nJoin wi th Google Hangouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/ speaker-tbd?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ 29vZ2xlLmNvbQ.gqcoggf4gmpn6vd19p5kjle880&hs=121 LAST-MODIFIED:20150917T141737Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160322T150000Z DTEND:20160322T163000Z DTSTAMP:20260828T094430Z UID:3j929d01q7u4u90pf9jf9fjg10@google.com CREATED:20160303T190222Z DESCRIPTION:This talk is one of six in this minicourse series. For more inf ormation\, please check our website: http://mcfp.physics.umd.edu/index.php/ events.html \n\nSpeaker: Aron Wall\n\nSpeaker Institution: Institute for Ad vanced Study\, Princeton\n\nTitle: Minicourse on Spacetime Thermodynamics\, Part I\n\nAbstract: PART I (March 21\, 22\, 23) will center on the concept of "entanglement entropy" in field theory\, a measure of the information i n a region. I will describe how to calculate this quantity by various tric ks (including holographic methods)\, and spell out some applications to ren ormalization theory\, condensed matter physics\, and quantum gravity. LAST-MODIFIED:20160303T190222Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Spacetime Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140407T200000Z DTEND:20140407T210000Z DTSTAMP:20260828T094430Z UID:0fuaer17umrik7q3v0esj7qd4s@google.com CREATED:20140325T182610Z DESCRIPTION:Speaker Name: Alexander Dunn\n\nSpeaker Institution : Stanford University\n\nTitle: Cellular biomechanics at the molecular scale\n\nAbstra ct : The ability of living cells to sense and respond to the mechanical pro perties of their surroundings underlies a wide range of cell and tissue eng ineering applications\, particularly in the area of stem cell biology. Howe ver\, the underlying mechanisms by which cells sense intrinsically mechanic al stimuli remain poorly understood\, due largely to a lack of tools that m easure forces within living cells and organisms. Our laboratory uses geneti cally encoded molecular tension sensors to measure the mechanical forces ex perienced by individual proteins in living cells. In this presentation I ou tline ongoing applications of this technology. \nWe use a Förster Resonance Energy Transfer (FRET)-based molecular tension sensor to test the origin a nd magnitude of tensile forces transmitted through the cytoplasmic domain o f E-cadherin\, a protein principally responsible for intercellular adhesion in a wide variety of cell types. We find that the cytoskeleton exerts pN-t ensile force on E-cadherin and that tension is increased at cell-cell conta cts when adhering cells are stretched. While the detailed mechanism remains to be characterized\, our observations support the presence of mechanicall y activated signalling pathways at cell-cell contacts\, with likely signifi cance in stem cell and tissue engineering.\nA conceptually similar strategy has allowed us to image the mechanical forces experienced by the cytoskele tal protein spectrin in touch-sensitive neurons in the model organism C. el egans. Previous work shows that spectrins are expressed in the nervous syst em in mammals and disrupted in human brain disorders. We find that neuronal spectrin is under mechanical prestress\, and that an intact\, prestressed spectrin network is required for touch sensitivity. Based on these and othe r data\, we suggest that spectrin-dependent prestress plays a central and c onserved role in the architecture and physiological function of the central and peripheral nervous systems.\nFinally\, I describe recent advances that allow us to directly visualize cell-generated forces with single-molecule sensitivity. We apply this technique to determine the distribution of force s generated by individual integrins\, a class of cell adhesion molecules wi th prominent roles throughout cell and developmental biology. We observe st rikingly complex distributions of tensions within individual integrin-based adhesions. FRET values measured for single probe molecules suggest that re latively modest tensions at the molecular level are sufficient to drive bot h robust cellular adhesion and matrix sensing.\n\n LAST-MODIFIED:20140325T182610Z LOCATION:0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150129T190000Z DTEND:20150129T203000Z DTSTAMP:20260828T094430Z UID:28ii4kpg72nalkdmh4eutkbtms@google.com CREATED:20150115T203120Z DESCRIPTION:Speaker Name: Prof. Christopher Lobb\n\nSpeaker Institution: U niversity of Maryland\n\nTitle: Ohm’s Law for Atom Circuits\n\nAbstract: Atomtronics is an emerging interdisciplinary field that is creating new dev ices and circuits where ultracold atoms\, often in the superfluid state\, h ave a role analogous to that of electrons in electronics. After giving a b rief overview of some experimental neutral atom-circuit results\, I will sh ow how these results can be described by lumped-element models analogous to those used in electronics. Resistance\, capacitance and inductance can be defined for neutral-atom circuits\, and they are analogous to the Sharvin resistance (in the non-superfluid case)\, quantum capacitance\, and kinetic inductance\, respectively\, in electronic circuits. In the superfluid cas e\, resistance must include different channels of dissipation\, and thus is not just a Sharvin resistance.\n\nWork done in collaboration with R. B. Bl akestad\, G. K. Campbell\, C. W. Clark\, S. Eckel\, M. Edwards\, K. Helmer son\, W. T. Hill\, III\, F. Jendrzejewski\, J. G. Lee\, B. J. McIlvain\, S. R. Muniz\, N. Murray\, W. D. Phillips\, A. Ramanathan\, K. C. Wright\, and M. Zelan. LAST-MODIFIED:20150120T211002Z LOCATION:Phys. Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160203T210000Z DTEND:20160203T220000Z DTSTAMP:20260828T094430Z UID:jes96f27cil0vnjtpccc3vetc4@google.com CREATED:20160129T194153Z DESCRIPTION:Speaker Name: Dr. Ammar Hakim\n\nSpeaker Institution : Princeto n University\n\nTitle: High-order energy conserving\, (discontinuous) finit e-element algorithms for (gyro) kinetic simulations of plasmas\n\nAbstract : I present high-order\, energy conserving\, continuum algorithms for the s olution of gyrokinetic equations for use in edge turbulence simulations. Th e distribution function is evolved with a discontinuous Galerkin scheme\, w hile the fields are evolved with a continuous finite-element method. These algorithms work for a general\, possibly non-canonical\, Poisson bracket op erator and conserve energy exactly. Benchmark simulations with ETG turbulen ce in 3X/2V are shown\, as well as initial applications of the algorithms t o computing heat-flux on the divertor plate in a simplified SOL geometry. E xtension of these algorithms to full Vlasov-Maxwell equations are presented . It is shown that with a particular choice of numerical fluxes the total ( particle+field) energy is conserved. Algorithms are implemented in a flexib le and open-source framework\, Gkeyll\, which also includes fluid models\, allowing potential hybrid simulations of various plasma problems. LAST-MODIFIED:20160129T194341Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131029T171500Z DTEND:20131029T183000Z DTSTAMP:20260828T094430Z UID:pngrmb7fskduqnu8gtf6f0g5oo@google.com CREATED:20131021T135954Z DESCRIPTION:Title : Quantitative Theory of the Structural Glass Transition. \n\nSpeaker Name: Professor Vassiliy Lunchenko\n\nSpeaker Institution : Uni versity of Houston\n\nNotes: For Further information contact:\n\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\, (301)405-4439 Professor John Wee ks\, jdw@umd.edu\, (301)405-4802 Professor Michelle Girvan\, Girvan@umd.edu \, (301)405-1610\n\n LAST-MODIFIED:20131021T140011Z LOCATION:IPST Building\, Romo 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141111T160000Z DTEND:20141111T173000Z DTSTAMP:20260828T094430Z UID:596666umvnp5ucktfhohkum2sk@google.com CREATED:20141029T154252Z DESCRIPTION:Speaker Name: Konstantin Matveev\n\nSpeaker Institution: Argo nne National Laboratory\n\nTitle: Conductance of uniform quantum wires\n\nA bstract: At low temperatures the conductance of a single channel quantum w ire takes the quantized value e^2/h\, a universal combination of the electr on charge and Planck's constant. This result is well understood in the mod el of noninteracting electrons. I will discuss corrections to the conducta nce of long uniform quantum wires caused by interactions between electrons. Properties of such one-dimensional systems are commonly described in term s of the Luttinger liquid theory. In this approximation\, the excitations of the system are noninteracting bosons decoupled from the electric current flowing through the wire\, and the conductance remains quantized. I will show that relaxation processes not captured by the Luttinger liquid theory lead to equilibration of the excitations with the current and give rise to a temperature-dependent correction to the conductance. The latter is deter mined by the velocity of the excitations and the relaxation rate.\n\nHost: Jay D. Sau\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20141029T154252Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141216T210000Z DTEND:20141216T220000Z DTSTAMP:20260828T094430Z UID:tljhd0oldhivfihr1oa72g4ft0@google.com CREATED:20141121T123309Z DESCRIPTION:Speaker Name: Xiangdong Ji\n\nSpeaker Institution: University of Maryland\n\nTitle: Hunting for WIMPs in the Panda Land\n\nAbstract: Weakly interacting massive particles (WIMPs)\, with properties similar to t hose of a heavy neutrino\, have been a leading candidate for the 27% dark m atter in the Universe.\n\nDirect detection experiments by detecting the nuc lear recoils from elastic scattering of WIPMs with atomic nuclei have made huge strides in the last decade\, improving the sensitivity by more than fi ve orders of magnitude. In this talk\, I will describe the first results fr om an adventure of searching for WIMPs with the PandaX detector\, in the wo rld’s deep underground lab in the high mountains of the western China.\n\n\ n\n\n\nJoin with Google Hangouts: https://hangouts.google.com/hangouts/_/ph ysics.umd.edu/physics?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2F sZW5kYXIuZ29vZ2xlLmNvbQ.tljhd0oldhivfihr1oa72g4ft0&hs=121 LAST-MODIFIED:20141211T194629Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160324T163000Z DTEND:20160324T173000Z DTSTAMP:20260828T094430Z UID:esuri37barjlt5bmaaqh7urj98@google.com CREATED:20160316T124016Z DESCRIPTION:Speakers: Joe Hart and Kanika Bansal\, UMD\n\nTitle: Chimera St ates and Cluster Synchronization\n LAST-MODIFIED:20160324T153634Z LOCATION:IREAP Conference Room (ERB 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140401T171500Z DTEND:20140401T181500Z DTSTAMP:20260828T094430Z UID:18l802cc0oppvb4vl343caain0@google.com CREATED:20140324T171351Z DESCRIPTION:Speaker Name: Professor Michael Fisher\n\nSpeaker Institution : University of Maryland\, College Park\n\nTitle : Effects of Proximity and Connectivity: Superfluid Helium Boxes and Layered Ising Models\n\nFor furth er information contact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu \, (301)405-4439 Professor John Weeks\, jdw@umd.edu\, (301)405-4802 Profess or Michelle Girvan\, Girvan@umd.edu\, (301)405-1610\n\n LAST-MODIFIED:20140324T171351Z LOCATION:Room 1116\, IPST Bldg. Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150918T160000Z DTEND:20150918T170000Z DTSTAMP:20260828T094430Z UID:f6rbukduj7lfq6i6o6rfpjcdgs@google.com CLASS:PUBLIC CREATED:20150910T163527Z DESCRIPTION:Speaker Name: Michael Jarret\n \nSpeaker Institution: QuICS\n \ nLocation and Time: PSC 2136 at 12:00pm (Free lunch served at 11:45)\n\nTit le: Mind the gap\n\n\nAbstract:Many useful properties of operators can be e xpressed in terms of their spectral gaps\, or the difference in their two s mallest eigenvalues. For instance\, the spectral gap is relevant to boundin g the runtime of an adiabatic optimization algorithm and mixing times of (s ub-)stochastic processes\, understanding the isoperimetric profile of space s and rates of heat diffusion\, and quantum phase transitions. In this talk \, I will briefly introduce the audience to the utility of the spectral gap in various physical\, mathematical\, and computational situations and cert ain (often overlooked) equivalences between them. Time permitted\, I will s tate the results of some known sub-optimal methods for bounding the spectra l gap\, our recent optimal approach\, and inherent difficulties to determin ing rigorous bounds. LAST-MODIFIED:20150910T163527Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150325T200000Z DTEND:20150325T210000Z DTSTAMP:20260828T094430Z UID:olrf88m42m2hdl1jp1ea027i10@google.com CREATED:20150319T201744Z DESCRIPTION:Speaker Name: Prof. Michael Shay\n\nSpeaker Institution : Unive rsity of Delaware\n\nTitle: Plasma Heating During Magnetic Reconnection\n\ nAbstract : Magnetic reconnection releases stored magnetic energy in the fo rm of fast flows and heating\, and plays an important role in many heliosph eric and laboratory plasmas. There is still significant uncertainty as to t he ultimate destination of the released magnetic energy\, whether into bulk flows\, thermal heating\, or energetic particle production. A key difficul ty with understanding how plasmas are heated is that reconnection timescale s are often much faster than collision timescales\, so conventional heating mechanisms such as resistivity are not applicable. In this seminar\, I wil l begin by outlining the basic theory of energy exchange during magnetic r econnection and what it can tell us about heating. I will then describe a s ystematic kinetic particle-in-cell (PIC) simulation study we have been perf orming. The focus will be on: (1) the energy partition of heating between t he electrons and ions\, (2) the mechanism or mechanisms leading to the heat ing\, and (3) how the character of heating changes with upstream boundary i nflow conditions. Results will be compared with satellite observations of h eating due to magnetic reconnection in the Earth's magnetosphere. Finally\, implications for the recently launched Magnetospheric Multiscale Mission ( MMS) will be discussed.\n\n LAST-MODIFIED:20150319T201744Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141118T181500Z DTEND:20141118T193000Z DTSTAMP:20260828T094430Z UID:D13E623D-3090-417A-9F3C-0B717BE7004A CREATED:20141118T142001Z DESCRIPTION:Speaker Name: Professor Ken Dill\n\nSpeaker Institution : Stony Brook University\n\nTitle : The Principle of Maximum Caliber in Nonequilib rium Statistical Mechanics.\n\n\nJoin with Google Hangouts: https://hangout s.google.com/hangouts/_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZ qcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ._8goj6h9m68pk8b9j60sj0b9k64 rk2b9p8opk6b9g88rj2dq28krj0c1k84&hs=121 LAST-MODIFIED:20141118T144657Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:7 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE BEGIN:VALARM ACTION:NONE TRIGGER;VALUE=DATE-TIME:19760401T005545Z X-WR-ALARMUID:1F13F427-EC67-4AF6-8651-5BF860821BEC UID:1F13F427-EC67-4AF6-8651-5BF860821BEC X-APPLE-DEFAULT-ALARM:TRUE END:VALARM END:VEVENT BEGIN:VEVENT DTSTART:20140520T183000Z DTEND:20140520T193000Z DTSTAMP:20260828T094430Z UID:ju864rp9ejtlpr1g053a4ub4ng@google.com CREATED:20140516T193414Z DESCRIPTION:Speaker: Reihaneh Shahrokhshahi\, University of Virginia\n\nTit le:A cavity enhanced narrow-band multi-photon source for applications in qu antum information.\n\nAbstract: Heralded single and multi-photon sources ba sed on the generation of correlated photon pairs have been a subject of gre at interest due to the non-Gaussian (negative) nature of their Wigner funct ion. Photons prepared in Fock states are the essence of the quantum nature of light and have applications in quantum cryptography\, quantum informatio n processing and universal quantum computing. The generation of heralded Fo ck states has been most commonly achieved by using spontaneous parametric d own-conversion (SPDC) in nonlinear crystals\; however\, the fidelity and th e success rate of Fock state generation is limited by the multimode nature of SPDC modes.\n\nIn this talk\, I will describe the investigation of cavit y-enhanced SPDC modes for higher-fidelity photon pair generation. We have b uilt an intrinsically stable OPO\, whose well-defined cavity modes were use d to herald photons\, with up to 80% efficiency in preliminary results. The heralding and measurements were performed by photon-number-resolving\, hig h-quantum-efficiency\, transition edge sensors built at NIST by Sae Woo Nam 's group." \n\nHost: Trey Porto\n\n\nJoin with Google Hangouts: https://han gouts.google.com/hangouts/_/physics.umd.edu/jqi-special?hceid=bGJrNjYwYTc1Y jhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ju864rp9ejtlpr1g0 53a4ub4ng&hs=121 LAST-MODIFIED:20140519T170516Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140722T200000Z DTEND:20140722T210000Z DTSTAMP:20260828T094430Z UID:le76g7u8ormk4i22jj52q0eopo@google.com CREATED:20140717T144914Z DESCRIPTION:Speaker: Rodney Van Meter \n\nSpeaker Institution: Keio Univer sity\, Japan)=\n\nTitle: Distributed Density Matrices\n\nAbstract: Density matrices are widely understood to represent a statistically valid sampling of a large number of quantum states prepared and measured under conditions as consistent as possible. A density matrix\, then\, represents the past\, in aggregate. However\, it is also our best tool for discussing the future behavior of an individual \nquantum state. In this talk\, I will discuss th e subtleties of tracking density matrices in quantum repeater networks\, wh ere they are used to represent our best guess about a current state\, and t o make real-time decisions about what actions to take next. In addition\, I will lead a discussion of the uses of distributed entanglement\, as we wo rk to set \ngoals for the types of distributed states to be created by repe ater networks\, and the fidelities and state creation rate required by appl ications these distributed quantum applications.\n\n\n\nJoin with Google Ha ngouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/jqi-special? hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvb Q.le76g7u8ormk4i22jj52q0eopo&hs=121 LAST-MODIFIED:20140718T170643Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141022T170000Z DTEND:20141022T183000Z DTSTAMP:20260828T094430Z UID:8fqc414ha3cgnsptncd094ckeo@google.com CREATED:20141015T131946Z DESCRIPTION:Speaker Name: Gokce Basar\n\nSpeaker Institution: University o f Maryland\n\nTitle: A scaling relation for proton-nucleus and nucleus-nucl eus collisions\n\nAbstract: Recently it was discovered at LHC and RHIC that at very high multiplicities\, proton-nucleus collisions exhibit remarkable long range two particle correlations that are similar to those in nucleus- nucleus collisions which exhibit collective phenomena. This is a striking r esult given the size of a proton-nucleus is rather small and such a collect ive response was unexpected. In order to explain such a similarity\, I intr oduce the framework of conformal dynamics where the ratio of mean free path to the system size is assumed to be the same in both systems. Based on an independent cluster model\, I argue that flow emerges as a collective respo nse to the geometric fluctuations in the positions of the clusters\, just l ike in nucleus-nucleus collisions. By examining the LHC data carefully\, I show that the simple model captures the essential physics of the long range correlations without the need of any fine tuning.\n\nJoin with Google Hang outs: https://hangouts.google.com/hangouts/_/physics.umd.edu/nuclear-physic s?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmN vbQ.8fqc414ha3cgnsptncd094ckeo&hs=121 LAST-MODIFIED:20141020T202419Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160205T170000Z DTEND:20160205T180000Z DTSTAMP:20260828T094430Z UID:jr1tooetvk9ss2f3qmskih96c4@google.com CLASS:PUBLIC CREATED:20160128T175655Z DESCRIPTION:Speaker Name: Shantanu Debnath\n\nSpeaker Institution: JQI\n\n( Free lunch served at 11:45)\n\nTitle: Quantum algorithms implemented on a t rapped-ion processor.\n\nAbstract: One approach towards implementing quantu m algorithms is breaking them down into basic logic gates and executing the se in a modular fashion. This allows for arbitrary sequences of gates opera ting on large qubit registers. In our experiment we demonstrate such a scal able architecture\, complete with arbitrary control over individual qubits. Our processor consists of five 171Yb+ atomic ions held in a Paul trap whic h provide robust “atomic clock” states as qubits and are connected by their common motional modes. Composite logic gates are comprised of elementary s ingle- and two-qubit rotations. By programming gate sequences in a reconfig urable manner we implement multiple instances of the Deutsch-Jozsa and the Bernstein-Vazirani problem. We further implement a scalable quantum Fourier transform protocol and examine its performance with reference to phase est imation algorithms and period finding\, a crucial ingredient in Shor’s fact orization. LAST-MODIFIED:20160128T202606Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141110T160000Z DTEND:20141110T170000Z DTSTAMP:20260828T094430Z UID:ieidn82ec7qt5gjr6n0naisjn8@google.com CREATED:20140711T172510Z DESCRIPTION:Speaker Name: Alan Aspuru-Guzik\n\nSpeaker Institution: Harvard \n\nTitle: Towards practical quantum simulation of chemical systems\n\nAbs tract: In this talk\, I will survey our group's efforts towards developing algorithms and setups for the simulation of chemical systems. I will discu ss digital approaches that rely on time evolution using the gate model of q uantum computation. Recent progress in the field this year has provided muc h better estimates of the scaling of the method\, and hence the number of g ates required to carry out simulation with chemical accuracy. I will surve y this work and provide an update on our latest progress. I will also disc uss a general approach that we call the variational quantum eigensolver (VQ E). The VQE approach (which can be rendered digitally or analogically) allo ws for the exploration of wave function ansazte by means of quantum devices . In addition\, I will discuss the adiabatic approach to quantum chemistry. If time permits\, I will discuss our ideas for the simulation of open quan tum systems such as photosynthetic complexes and excitons in organic materi als by means of open quantum systems simulators.to follow\n\nHosts: Luis Or ozco\, James Williams\n\nJoin with Google Hangouts: https://hangouts.google .com/hangouts/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqc jg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ieidn82ec7qt5gjr6n0naisjn8&hs =121 LAST-MODIFIED:20141107T164242Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160107T190000Z DTEND:20160107T200000Z DTSTAMP:20260828T094430Z UID:per6jjmdd1j36hej9lve56gkd0@google.com CREATED:20151210T151308Z DESCRIPTION:Speaker: Katja Ried\n\nSpeaker Affiliation: IQC/Perimeter\n\nTi tle: Causal models for a quantum world\n\nAbstract: Quantum theory is a the ory of information\, imposing new -- and often counter-intuitive -- rules o n how it can be acquired\, processed and shared. To understand these rules\ , one can draw on the framework of causal Bayesian networks\, which success fully addresses questions concerning knowledge\, causation and inference in the context of classical statistics. The process of adapting classical cau sal models to accommodate quantum theory provides a new perspective on the fundamental differences between the two.\n\nA central task in causal modeli ng is to characterize causal relations based solely on observed correlation s. In the case of just two systems\, we find that quantum coherence (eg ent anglement) provides a distinct advantage for this problem\, as it is known to do for other tasks such as cryptography and information processing. A li near optics experiment demonstrates this advantage in practice.\n\n[Nat Phy s 11\, 414 (2015)] LAST-MODIFIED:20160104T143621Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131211T180000Z DTEND:20131211T190000Z DTSTAMP:20260828T094430Z UID:mhimn51l2suecbk5vd0aap7it0@google.com CLASS:PUBLIC CREATED:20131205T154744Z DESCRIPTION:Speaker: Sarang Gopalakrishnan\n\nInstitution: Harvard\n\nTitle : Dissipation-stabilized magnetic phases in anisotropic spin systems*\n\nAb stract: We consider strongly interacting systems of effective spins\, subje ct to dissipative spin-flip processes associated with optical pumping. We p redict the existence of novel magnetic phases in the steady state of this s ystem\, which emerge due to the competition between coherent and dissipativ e processes. Specifically\, for strongly anisotropic spin-spin interactions \, we find ferromagnetic\, antiferromagnetic\, and spin-density-wave steady states\, which are separated by nonequilibrium phase transitions meeting a t a Lifshitz point. Effects of quantum fluctuations and disorder\, as well as experimental implementations in ultracold atoms and trapped ions\, are d iscussed.\n\n* T.E. Lee\, S. Gopalakrishnan\, and M.D. Lukin\, Phys. Rev. L ett. 110\, 257204 (2013)\n LAST-MODIFIED:20131205T200556Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140509T150000Z DTEND:20140509T163000Z DTSTAMP:20260828T094430Z UID:suj6lnqcmfcec47sfq5scv34hs@google.com CREATED:20140326T155051Z DESCRIPTION:Speaker Name: Vadim Oganesyan \n\nSpeaker Institution: City U niversity of New York\n\nTitle: Aspects of Many-Body Localization\n\nAbstra ct: Many-body localization is absence of transport in interacting many-body systems prepared with finite entropy per particle. This behavior is necess arily separated from conventional diffusion by a dynamical finite temperatu re transition. Many-body localized systems can retain detailed memories of initial conditions and therefore violate thermalization hypothesis underlyi ng standard statistical mechanics description of interacting systems. This talk will survey recent progress\, both theoretical and experimental\, in r ealizing and understanding many-body localization.\n\nHost: Kostyantyn Kec hedzhi\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20140501T194408Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151012T140000Z DTEND:20151012T170000Z DTSTAMP:20260828T094430Z UID:j873s6gg7rnrev7k90tb95vlis@google.com CREATED:20150921T193921Z DESCRIPTION:Theme: Dirac and Related Materials\n\n10:00 AM Jedediah Pixle y "The effects of disorder on Dirac and Weyl semi-metals"\n\n10:45 AM Meh di Kargarian "Surface states of Dirac semimetals"\n\n11:30 AM Robert Thro ckmorton "Many-Body Effects and Ultraviolet Renormalization in 3D Dirac Materials"\n\n12:15 PM Hilary Hurst "Charged Skyrmions on the Surface of a Topological Insulator"\n LAST-MODIFIED:20150921T193921Z LOCATION:2205 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140424T163000Z DTEND:20140424T173000Z DTSTAMP:20260828T094430Z UID:lefgtaj248o21s17enb751326o@google.com CREATED:20140418T143550Z DESCRIPTION:Speaker Name: Julian Candia\n\nSpeaker Institution : UMD\n\nTit le : Unbiased Learning from Big Data: Multidimensional Approaches for Data- Driven Biomedical Research LAST-MODIFIED:20140418T143838Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141103T213000Z DTEND:20141103T223000Z DTSTAMP:20260828T094430Z UID:jdpr5q0l69d1i8gcs05jd34oeo@google.com CREATED:20141013T174931Z DESCRIPTION:Speaker Name: Daniel Berdichevsky\n\nSpeaker Institution: Godda rd Space Flight Center\n\nTitle: On a few properties of very dilute matter frozen in space magnetic fields\n\nAbstract: For a case study\, the flux-ro pe (FR) that passed Earth on June 2\, 2014 (1) (see also listing of magneti c clouds and their properties in the Wind SC MFI science team site at http: //wind.gsfc.nasa.gov/mfi/mag_cloud_S1.html)\, we proceed to interpret plasm a and magnetic field observations in the context of MHD. The observations u sed are 3s average interplanetary magnetic field (Wind/MFI instrument) and 3s plasma (Wind/SWE instruments) data (2). After identifying the observed c orrelation between electron density\, temperature and pressure in the plasm a frame of reference we proceed to establish the existence of a relationshi p between these plasma observables with the magnetic field pressure. By ass uming ideal MHD conditions to be valid we proceed to confirm that the mediu m is diamagnetic\, as is to be expected for the MHD state of matter and mag netic field which is assumed to be a superconducting medium. Additionally w e infer the presence of magnetization work\, as well as a few other constit utive properties of this state of matter. \n\n (1) Berdichevsky D. B.\, R. P. Lepping\, and C. J. Farrugia\, Geometric considerations of the evolution of magnetic flux ropes\, Phys. Rev. E67\, doi:10.1103/PhysRevE.036405. Lep ping R. P. et al\, A summary of Wind magnetic clouds for years 1995 – 2003: model-fitted parameters\, associated errors and classifications\, Ann. Geo physicae\, 24\, 215-245\, 2006. \n\n (2) Ogilvie\, K. W.\, et al\, SWE\, A comprehensive plasma instrument for the Wind spacecraft\, Space Sci. Rev.\, 71\, 55 – 77\, 1995\; Lepping R. P.\, et al \, The Wind Magnetic Field Inv estigation\, Space Sci. Rev.\, 71\, 207 – 229\, 1995.\n\nNotes: Coffee\, Te a & Cookies 4:15-4:30 PM\n\n\nJoin with Google Hangouts: https://hangouts.g oogle.com/hangouts/_/physics.umd.edu/space-and?hceid=bGJrNjYwYTc1YjhqaDdlaz Zqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.jdpr5q0l69d1i8gcs05jd34oeo &hs=121 LAST-MODIFIED:20141013T174931Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120423T154500Z DTEND:20120423T163000Z DTSTAMP:20260828T094430Z UID:7ef1st56rtj6effqb2l2qvg5n8@google.com CREATED:20120409T131849Z LAST-MODIFIED:20120409T131855Z LOCATION:Physics 1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140407T150000Z DTEND:20140407T163000Z DTSTAMP:20260828T094430Z UID:frh9nng2boatvq6ar21st1775c@google.com CLASS:PUBLIC CREATED:20140102T150211Z DESCRIPTION:Speaker:Charlie Kane\, \n\nInsitution: University of Pennsylvan ia\n\nTitle:The Time Reversal Invariant Fractional Josephson Effect \n\nAbs tract:\nTopological Superconductivity is a topic of current interest becaus e of its potential for providing a new method for storing and manipulating quantum information. One of the most basic consequences of topological sup erconductivity is the fractional Josephson effect\, which arises due to the coherent tunneling of single electrons between two superconductors and giv es rise to an AC Josephson effect with half the \nusual Josephson frequency . In this talk we will review the theoretical \nfoundations for the fract ional Josephson effect and discuss prospects for observing it in proximity effect structures based on semiconductor \nnanowires as well as on topologi cal insulators. We will then describe \nrecent work in which we have show n that the presence of time reversal symmetry leads to a significant modifi cation of the fractional Josephson effect.\n\nHost: Victor Galitski LAST-MODIFIED:20140321T195503Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20150326T193000Z DTEND:20150326T203000Z DTSTAMP:20260828T094430Z UID:8m7a4b646815m4ej2to1nhnt7g@google.com CREATED:20150304T212744Z DESCRIPTION:Speaker: Matt Calkins\nAbstract: We will begin talking about E. Witten\, "Notes On Supermanifolds and Integration"\, arxiv:1209.2199. LAST-MODIFIED:20150304T212744Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Witten's paper on integration on supermanifolds\, part 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160330T200000Z DTEND:20160330T210000Z DTSTAMP:20260828T094430Z UID:3ef7p6nemu2o7rphfgs15fjbk0@google.com CREATED:20160316T134457Z DESCRIPTION:Speaker Name: Dr. Istvan Pusztai\n\nSpeaker Institution : Chalm ers University\, Sweden\n\nTitle : Departures from a Maxwellian drive in gy rokinetic simulations -- kink modes and hot minorities\n\nAbstract : Gyroki netic simulations widely used to model turbulent transport in magnetized pl asmas normally assume the electron and ion distribution functions are Maxwe llians with the same drift velocity. In this talk we discuss two problems w here this assumption needs to be relaxed: First we consider the limitations of radially local codes in modeling current driven instabilities\, such as kink and tearing modes. In the second part of the talk we present the turb ulent transport of a radio frequency heated non-Maxwellian trace ion specie s used to mimic alpha particles in fusion devices.\n\nParallel electron cur rent driven by the induced electric field in a tokamak that can destabilize kink modes is not retained in standard gyrokinetic simulations. To retain kink modes the electrons must be allowed to have the proper self-consistent parallel flow with respect to the ions. When this electron flow is suffici ently large in a inhomogeneous\, finite beta tokamak plasma the shea! r Alf ven wave solutions of the electromagnetic gyrokinetic equation can become n early purely growing kink modes\, but do so outside the regime of validity of a radially local analysis and the simulation. Nonetheless\, this kink mo de can be used as a useful test of local gyrokinetic codes when a current g radient drive term is implemented. A code passing this test is expected to be correct at lower current gradient that may be sufficient to destabilize non-ideal current driven modes.\n\nWe also discuss the turbulent transport of an ion cyclotron resonance heated (ICRH)\, MeV range minority ion specie s in tokamak plasmas. Such highly energetic minorities\, which can be produ ced in the novel three ion minority heating scheme\, have been proposed to be used to experimentally study the confinement properties of fast ions wit hout the generation of fusion alphas. We compare the turbulent transport pr operties of ICRH ions with that of fusion born alpha particles. Our results indica! te that care must be taken when conclusions are drawn from experim enta l results: While the effect of turbulence on these particles is simila r in terms of transport coefficients\, differences in their distribution fu nctions -- ultimately their generation processes -- make the resulting turb ulent fluxes different.\n\n LAST-MODIFIED:20160316T134547Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150330T203000Z DTEND:20150330T213000Z DTSTAMP:20260828T094430Z UID:hon415ni02265r0823d1hn2iqk@google.com CREATED:20150226T191723Z DESCRIPTION:Speaker Name: Prof. Merav Opher\n\nSpeaker Institution: Boston University\n\nTitle: MAGNETIZED JETS DRIVEN BY THE SUN: THE STRUCTURE OF TH E HELIOSPHERE REVISITED\n\nAbstract : The classic accepted view of the heli osphere is a quiescent\, comet-like shape aligned in the direction of the S un’s travel through the interstellar medium (ISM) extending for thousands o f astronomical units (AUs). Here\, we show\, based on magnetohydrodynamic ( MHD) simulations\, that the tension (hoop) force of the twisted magnetic fi eld of the Sun confines the solar wind plasma beyond the termination shock and drives jets to the north and south very much like astrophysical jets. T hese jets are deflected into the tail region by the motion of the Sun throu gh the ISM similar to bent galactic jets moving through the intergalactic m edium. The interstellar wind blows the two jets into the tail but is not st rong enough to force the lobes into a single comet-like tail\, as happens t o some astrophysical jets. Instead\, the interstellar wind flows around the heliosphere and into the equatorial region between the two jets. As in som e astrophysical jets that are kink unstable\, we show here that the heliosp heric jets are turbulent (due to large-scale MHD instabilities and reconnec tion) and strongly mix the solar wind with the ISM beyond 400 AU. The resul ting turbulence has important implications for particle acceleration in the heliosphere. The two-lobe structure is consistent with the energetic neutr al atom (ENA) images of the heliotail from IBEX where two lobes are visible in the north and south and the suggestion from the Cassini ENAs that the h eliosphere is “tailless.”\n\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM LAST-MODIFIED:20150226T191904Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150415T150000Z DTEND:20150415T155000Z DTSTAMP:20260828T094430Z UID:p17rq1m1rir8vr614iailoiopc@google.com CREATED:20150414T185545Z DESCRIPTION:Speaker Name: Dr. William Amatucci\n\nSpeaker Institution : Nav al Research Laboratory\n\nTitle : Ground-Based Space Plasma Physics in the NRL Space Chamber\n\nAbstract : Space plasmas demonstrate a rich variety of phenomena and considerable challenges to their investigation. The Naval R esearch Laboratory has developed the Space Physics Simulation Chamber\, a l arge-scale laboratory device dedicated to the reproduction of scaled plasma conditions representative of a wide variety of near-Earth space plasma reg ions. This device has been used to investigate ionospheric auroral zone ph ysics\, magnetospheric boundary layer dynamics\, radiation belt wave-partic le interactions\, and spacecraft charging. It has also been used to develo p new diagnostic tools for space flight and to plasma qualify satellite har dware prior to flight. In this talk\, a brief overview of Space Chamber ca pabilities will be given\, with emphasis on recent radiation belt dynamics experiments and development of a plasma impedance probe for upcoming soundi ng rocket and satellite missions. LAST-MODIFIED:20150414T185645Z LOCATION:Kim Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20151214T160000Z DTEND:20151214T170000Z DTSTAMP:20260828T094430Z UID:q26pdh61kj5tf0prviculgq49k@google.com CREATED:20151204T210325Z DESCRIPTION:Speaker: Charles Lim\n\nSpeaker Affiliation: Oak Ridge\n\nTitle : Nonlocality with quantum inputs: fair-sampling assumption\, post-selectio n\, and the detection-loophole.\n\nAbstract: In this seminar\, we look at h ow one can use certain properties of quantum physics to bypass the fair-sam pling assumption commonly used in most practical Bell experiments. Our appr oach is based on an alternative nonlocality framework called “semi-quantum nonlocality”\, where measurement instructions are represented by quantum in puts instead of classical inputs. A key feature of this framework is that a ll “entangled states are nonlocal”\, in the sense that for any entangled st ate there is always a semi-quantum Bell inequality with which violation can be achieved. Building on this framework\, we present a semi-quantum versio n of the CHSH inequality whose post-selected local bound is independent of the detection loss. We will then use this inequality as an example to illus trate how quantum inputs may be used to relax the fair-sampling assumption and hence close the detection-loophole. LAST-MODIFIED:20151210T162314Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140416T153000Z DTEND:20140416T170000Z DTSTAMP:20260828T094430Z UID:p2g9563rmc55s4a9epqna6piac@google.com CREATED:20140307T135803Z DESCRIPTION:Title: Electroweak Baryogenesis: Searching for New Scalars and New CPV\n\nSpeaker: Michael Ramsey-Musolf\, University of Massachusetts\n\n Abstract: Electroweak baryogenesis remains one of the most viable and the m ost testable scenario for explaining the cosmic baryon asymmetry. I review the status and prospects for this scenario in light of LHC Higgs studies an d searches for new scalars and present and prospective electric dipole mome nt searches. LAST-MODIFIED:20140408T161849Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150202T210000Z DTEND:20150202T223000Z DTSTAMP:20260828T094430Z UID:hhvb4j72dmrajd8sfqo0681ac8@google.com CREATED:20150105T141309Z DESCRIPTION:Title: New Insights into Cosmic Abundances of Matter and Relate d Phenomenology\n\nSpeaker: Yanou Cui\, Perimeter Institute\n\nAbstract: I will review prominent puzzles about the cosmic relic abundances of atomic m atter and dark matter\, and discuss new theoretical ideas/models to address these puzzles. The connection of these theories with new particle physics frontiers such as the Higgs mechanism and supersymmetry will be discussed. I will also demonstrate the rich phenomenological predictions from these th eories that can be tested in a variety of experiments such as with neutrino detectors and the Large Hadron Collider (LHC).\n\nJoin with Google Hangout s: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid =bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.hhv b4j72dmrajd8sfqo0681ac8&hs=121 LAST-MODIFIED:20150130T161836Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160418T190000Z DTEND:20160418T200000Z DTSTAMP:20260828T094430Z UID:5l674ede786k2r6b1ot6epbfv0@google.com CREATED:20160406T181142Z DESCRIPTION:Speaker: Lev Vaidman\n\nSpeaker Affiliation: Tel-Aviv Universit y\n\nTitle: "Counterfactual'' communication protocols\n\nAbstract: Counterf actual communication is communication without particles in the transmission channel. It is argued that an interaction-free measurement of the presence of opaque objects can be named `counterfactual'\, while proposed ``counter factual'' measurements of the absence of such objects are not counterfactua l. The quantum key distribution protocols which rely only on measurements o f the presence of the object are counterfactual\, but quantum direct commun ication protocols are not. Therefore\, the name `counterfactual' is not app ropriate for recent "counterfactual" protocols which transfer quantum state s by quantum direct communication.\n\nSee http://carnap.umd.edu/philphysics /vaidmanvaxjo.pdf LAST-MODIFIED:20160406T181142Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150922T171500Z DTEND:20150922T181500Z DTSTAMP:20260828T094430Z UID:ug69acpu5hbcbfehenms0lm1k0@google.com CREATED:20150916T132720Z DESCRIPTION:Title : Characterizing microscopic rearrangements and interacti ons within granular flows\nSpeaker Name: Matthew Harrington\, University of Maryland\, College Park\nAbstract : Granular materials constitute a class of complex systems that exhibit global behaviors that are reminiscent of so lids\, liquids\, gases\, or otherwise uniquely their own. While the macrosc opic size of individual grains tends to perclude direct application of stan dard techniques from thermodynamics and statistical mechanics\, there are e mergent properties of grain ensembles that span from the microscopic (or gr ain-scale) to the bulk scale. Insights on widely observed granular phenomen a\, such as segregation and compaction\, can thus arise from directly probi ng how individual grains move and interact with each other. In this talk\, I will discuss work that I have done using experimental 3D refractive index -matched imaging\, as well as molecular dynamics simulations\, to character ize microscopic features of granular shear flows and gain insights into how granular materials segregate or compact under cyclic forcing. LAST-MODIFIED:20150916T132720Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140130T183000Z DTEND:20140130T190000Z DTSTAMP:20260828T094430Z UID:csnsrpb22nf41j6gh2k1ostkbo@google.com CREATED:20140108T163951Z LAST-MODIFIED:20140108T163951Z LOCATION:Physics Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150202T160000Z DTEND:20150202T170000Z DTSTAMP:20260828T094430Z UID:4n0uk98vmli5rfdr5hdvsna8d8@google.com CREATED:20150130T154413Z DESCRIPTION:Speaker Name: Hartmut Haeffner\n\nSpeaker Institution: UC Ber kley\n\nTitle: Quantum information\, quantum correlations and a Michelson-M orley test with electrons\n\nAbstract: Quantum information processing prom ises to speed up certain computational tasks. The expectations are high\, b ut many technological hurdles have to be overcome before we can build a qua ntum computer. Nevertheless\, already today quantum information allows for novel insights into physics. In this talk\, I will summarize our progress t owards building an ion trap quantum computer. In addition\, I will discuss experiments studying the dynamics of quantum correlations in ion strings as well as a surprising application of quantum information to fundamental phy sics. Using the precise experimental control over individual ions\, we veri fy Lorentz invariance at a level of 10-18\, improving the limits set by tra ditional Michelson-Morley experiments by a factor of five LAST-MODIFIED:20150130T191804Z LOCATION:2400 Computer and Space Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150312T193000Z DTEND:20150312T203000Z DTSTAMP:20260828T094430Z UID:5u5m5s5tsm3j33u3oinds4t8i4@google.com CREATED:20150304T212636Z DESCRIPTION:Speaker: Stephen Randall and William Linch\nAbstract: We'll dis cuss how (super)Lie algebra cohomology makes it possible to organize all th e Bianchi identities for superforms\, which previously didn't appear to fol low any particular pattern. Reference: arXiv:1412.4686. (postponed because of snow from 3/5) LAST-MODIFIED:20150304T212636Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bianchi identities and (super)Lie algebra cohomology TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140425T170000Z DTEND:20140425T180000Z DTSTAMP:20260828T094430Z UID:achtrbu3i0t7hj0kmlttso1ruc@google.com CREATED:20140418T143824Z DESCRIPTION:Speaker Name: Eckhard Quandt\n\nSpeaker Institution : Institute for Materials Science\, Christian-Albrechts-Universität\, Kiel\, Germany\n \nTitle : Superelastic TiNi Thin Film Medical Implants\n\nAbstract : Shape memory alloys based on binary equiatomic TiNi exhibits superelastic propert ies with superelastic strains larger than 8%\, tensile strengths up to 1400 MPa\, and breaking elongations up to 60%. Additionally\, the material is k nown to reveal an excellent biocompatibility. Both features result in a hig h attractiveness for its use for medical implants and devices\, as\, e.g.\, for example stents. For further miniaturization of medical implant\, e.g.\ , for neurostents\, thin film technology has gained increasing interest in comparison to traditional bulk fabrication routes.\n\nThis presentation wil l cover the fabrication of micropatterned freestanding TiNi thin films\, wi ll discuss the mechanical and the fatigue properties in comparison to tradi tional bulk TiNi\, will show the new possible functionalities of thin film stents and will present a method to fabricate NiTi thin film leaflets for t ranscatheter aortic valve replacements.\n\nFunding by the DFG (German Scien ce Foundation) is gratefully acknowledged. LAST-MODIFIED:20140418T144205Z LOCATION:Room 2110 Chemical & Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141020T200000Z DTEND:20141020T210000Z DTSTAMP:20260828T094430Z UID:3qa9tf0593k49nbfjd943d6b18@google.com CREATED:20140922T155140Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/koaks?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAu Y2FsZW5kYXIuZ29vZ2xlLmNvbQ.3qa9tf0593k49nbfjd943d6b18&hs=121 LAST-MODIFIED:20141016T142917Z LOCATION:0112 Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar - No seminar\, event cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150224T181500Z DTEND:20150224T193000Z DTSTAMP:20260828T094430Z UID:04spp5l5tq50roh5gfeb8ahcpc@google.com CREATED:20150216T181335Z DESCRIPTION:Speaker Name: Dr. Natalia Denesyuk\n\nSpeaker Institution : Uni versity of Maryland\n\nTitle : Monovalent and Divalent Salt Effects on RNA Folding and Stability.\n\nAbstract : In this talk I will present a new coar se-grained model for RNA which makes it possible to address the problems of RNA folding and stability in simulation. When discussing model application s\, I will concentrate primarily on the electrostatic interactions between RNA and monovalent and divalent ions. In one kind of application\, the depe ndence of the stability of basic double-helical RNA on the monovalent ion c oncentration will be considered. Here I will analyse the quantitative conne ction between RNA stability and ion preferential coefficients. In a differe nt application\, I will follow the complex folding pathway of a self-splici ng RNA enzyme in the presence of divalent ions. I will show that the self-s plicing RNA utilizes highly specific interactions with Mg++ ions for its fo lding\, which effectively excludes the possibility of folding by Ca++ ions or monovalent salt. This identified mechanism of Mg++-induced folding of th e self-splicing RNA is very general and possibly utilized in the folding of other types of functional RNA. LAST-MODIFIED:20150216T181335Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140331T173000Z DTEND:20140331T183000Z DTSTAMP:20260828T094430Z UID:dt70fqvdik5g18badu4of0gia4@google.com CREATED:20140116T172841Z DESCRIPTION:Title: "Bose-Einstein Condensation in the Very Hot"\n\nSpeaker: Jinfeng Liao\, Indiana\n\nAbstract: To understand the evolution of a dense system of gluons toward an equilibrated hot quark-gluon plasma\, such as t hose produced in the early stages of ultra-relativistic heavy ion collision s\, is an important and challenging problem. As emphasized in recent works\ , the role of Bose statistical factors in amplifying the rapid growth of th e population of the soft modes is essential. With these factors properly ta ken into account\, one finds that elastic scattering alone provides an effi cient mechanism for populating soft modes\, and in fact leads to rapid infr ared local thermalization. Furthermore we have recently suggested that high initial overpopulation plays a key role and may lead to dynamical Bose-Ein stein Condensation. The kinetics of condensation is an interesting problem in itself. By solving the transport equation for initial conditions with a large enough initial phase-space density the equilibrium state contains a B ose condensate\, and we have found numerical evidence that such over-popula ted systems reach the onset of Bose-Einstein condensation in a finite time. It is also found that the approach to condensation is characterized by a s caling behavior that is robust against varied details of the system. LAST-MODIFIED:20140331T145027Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160225T203000Z DTEND:20160225T220000Z DTSTAMP:20260828T094430Z UID:er6h2l0fo02q8mmsvqq7liaqd0@google.com CREATED:20160212T193027Z DESCRIPTION:Speaker: Andrew Harder (Miami) - \n LAST-MODIFIED:20160212T193027Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Geometry of Landau-Ginzburg models TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160309T200000Z DTEND:20160309T210000Z DTSTAMP:20260828T094430Z UID:a440fl8v4o2eu20gpriua5gu2g@google.com CREATED:20160226T163415Z DESCRIPTION:Speaker Name: Prof. Chris Lobb\n\nSpeaker Institution : Univers ity of Maryland\n\nTitle : Pushing Atoms Instead of Electrons: Everything Y ou Learned about Circuits Still Helps\n\nAbstract : Atomtronics is an emerg ing interdisciplinary field that is creating new devices and circuits where ultracold atoms\, often in the superfluid state\, have a role analogous to that of electrons in electronics. After giving a brief overview of some ex perimental neutral atom-circuit results\, I will show how these results can be described by lumped-element models analogous to those used in electroni cs. Resistance\, capacitance and inductance can be defined for neutral-atom circuits\, and they are analogous to the Sharvin resistance (in the non-su perfluid case)\, quantum capacitance\, and kinetic inductance\, respectivel y\, in electronic circuits. In the superfluid case\, resistance must includ e different channels of dissipation\, and thus is not just a Sharvin resist ance. LAST-MODIFIED:20160226T163806Z LOCATION:Laboratory for Physical Sciences SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140911T173000Z DTEND:20140911T180000Z DTSTAMP:20260828T094430Z UID:6op5asuhjav3mq9lgkskfeh100@google.com CREATED:20140828T211521Z DESCRIPTION:Join with Google Hangouts: https://hangouts.google.com/hangouts /_/physics.umd.edu/refreshments?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ 3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.6op5asuhjav3mq9lgkskfeh100&hs=121 LAST-MODIFIED:20140828T211531Z LOCATION:Phys. room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for CNAM Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150210T181500Z DTEND:20150210T193000Z DTSTAMP:20260828T094430Z UID:0jol4cmospsbo5ee8o6tfjfud4@google.com CREATED:20150130T202354Z DESCRIPTION:Speaker Name: Professor Tongcang Li\n\nSpeaker Institution : Pu rdue University\n\nTitle : Brownian Motion at Short Time Scales.\n\nAbstrac t: Brownian motion has played important roles in many different fields of science since its origin was first explained by Albert Einstein in 1905. Ei nstein's theory of Brownian motion\, however\, is only applicable at long t ime scales. At short time scales\, Brownian motion of a suspended particle is not completely random\, due to the inertia of the particle and the surro unding fluid. Moreover\, the thermal force exerted on a particle suspended in a liquid is not a white noise\, but is colored. Recently\, we developed an ultrasensitive optical tweezer\, and measured the instantaneous velocity of a Brownian particle in both gas and liquid. This ultrasensitive optical tweezer provides a powerful tool for studying statistical mechanics of sma ll systems. References: T. Li\, et al. Science\, 328\, 1673 (2010). S. Khei fets\, et al. Science\, 343\, 1493 (2014).\n\n LAST-MODIFIED:20150130T202520Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140327T190000Z DTEND:20140327T200000Z DTSTAMP:20260828T094430Z UID:cead1shpfg3mhbgb342esg7tp8@google.com CREATED:20140321T175422Z DESCRIPTION:Speaker: Sungwoo Hong (UMCP)\nAbstract: Now that we've explaine d the structure of the super-Poincare algebra\, we will start to discuss fi eld theories with supersymmetry and the idea of superspace and supermanifol ds. LAST-MODIFIED:20140321T175422Z LOCATION:Physics 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Supersymmetric field theories TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160310T180000Z DTEND:20160310T190000Z DTSTAMP:20260828T094430Z UID:p9usj57ohjh6lftgm3vdpsc15c@google.com CREATED:20160304T142017Z DESCRIPTION:\n\nParaj Titum\, Caltech\n\nEffects of disorder in Floquet top ological phases\n\nPeriodically driven systems provide a novel platform to realize rich topological phenomena\, with Floquet topological insulators be ing the best known example. In fact\, it is possible to realize topological phases in these systems with no analogs in static systems. In my talk\, I will present results on the effects of disorder in various Floquet topologi cal phases. In the first part of my talk\, I will examine the robustness of the Floquet topological insulator to disorder. In the second part\, I will present two new disorder-induced topological phenomena in time-periodic sy stems. The first is an example of a dynamical analog to a topological Ande rson insulator\, which is a disorder-induced Chern insulator. The second is a realization of disorder-induced topological phenomenon unique to a perio dically driven system\, a quantized non-adiabatic charge pump. LAST-MODIFIED:20160304T142017Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140918T180000Z DTEND:20140918T193000Z DTSTAMP:20260828T094430Z UID:esnv8q18bge3hb8d6nqa10r68k@google.com CREATED:20140828T211911Z DESCRIPTION:Speaker Name: Dr. Leonid Rokhinson\, Purdue University\n\nTitl e: Search for new systems with non-Abelian excitations\n\nAbstract: I will start the talk with a brief introduction into the physics of Majorana ferm ions in semiconductor/superconductor hybrids and description of our experim ents where the fractional ac Josephson effect\, a hallmark of topological m atter\, has been observed. I will continue with the discussion of challenge s facing the field\, namely that hybrid nanowire topological superconductor s have localized topological states at the ends of the wire\, which makes t hem ideal for spectroscopy studies but renders manipulation and demonstrati on of non-Abelian statistics extremely challenging.\n\nRecently we develope d new heterostructures where a sign of the effective g-factor of electrons in a 2D gas can be changed by electrostatic gating at high magnetic fields. This unconventional behavior is achieved in high mobility CdTe quantum wel ls with engineered placement of Mn atoms. In a quantum Hall regime such tun ability allows one to form domains of quantum Hall ferromagnets\, with doma in walls consist of counter-propagating edge states of opposite polarizatio n. Apart from interesting spintronics applications\, these re-configurable domain walls can form a new platform where Majorana fermions\, parafermions \, Fibonacci fermions and generalized topological defects can be created\, braided\, manipulated and fused in a controllable fashion. I will discuss o ur first results where electrostatic control of the 2D gas polarization in a QHE regime is demonstrated.\n\nHost: J. Williams\n\nJoin with Google Han gouts: https://hangouts.google.com/hangouts/_/physics.umd.edu/cnam-cond?hce id=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.e snv8q18bge3hb8d6nqa10r68k&hs=121 LAST-MODIFIED:20140911T163628Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150511T200000Z DTEND:20150511T210000Z DTSTAMP:20260828T094430Z UID:m8ng7712uniqi4t3alm67th774@google.com CREATED:20150506T181434Z DESCRIPTION:Speaker Name: Jonathan McKinney\n\nSpeaker Institution : Univer sity of Maryland\n\nTitle : Growing Black Holes via Super-Eddington Accreti on\n\nAbstract : Black hole engines power phenomena from the large-scale he ating of gas in galaxies and clusters down to the event horizon-scale forma tion of relativistic jets. We reveal how our unique state-of-the-art genera l relativistic radiation magnetohydrodynamical simulations of accreting bla ck holes and their feedback (as radiation\, winds\, and jets) could help so lve the problem of the rapid formation of high redshift quasars and might e xplain the origin of the black-hole-mass to bulge-velocity-dispersion (M-si gma) correlation in galaxies. Radiation physics in simulations will provide a fresh understanding of a broad range of phenomena including active galac tic nuclei\, x-ray binaries\, gamma-ray bursts\, tidal disruption events\, and strong gravity regimes like those probed by the Event Horizon Telescope .\n\nJSI Colloquium Series. Refreshments available at 3:30 pm\n\nReschedul ed from 4/6.\n​​ LAST-MODIFIED:20150507T155218Z LOCATION:​ 1136 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20150617T170000Z DTEND:20150617T183000Z DTSTAMP:20260828T094430Z UID:9s0889m572ln59sc1nmpo6kaqg@google.com CREATED:20150605T130534Z DESCRIPTION:Speaker Name: Dr. Evan Berkowitz\n\nSpeaker Institution: Lawre nce Livermore National Laboratory\n\nTitle: Lattice QCD Input to Axion Cosm ology\n\nAbstract: The Strong CP Problem can be resolved by introducing an additional global symmetry known as Peccei-Quinn symmetry. Once PQ symmetr y is broken the pNGB\, the axion\, is a plausible dark matter candidate. C alculating the cosmological energy density of the axion requires nonperturb ative QCD input. I will discuss a pure Yang--Mills calculation of these in puts and examine the implications for the axion mass and coupling. LAST-MODIFIED:20150605T193124Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160322T163000Z DTEND:20160322T173000Z DTSTAMP:20260828T094430Z UID:6qifqtd2esb8gbmtcng30tgrio@google.com CREATED:20160316T123801Z DESCRIPTION:Title: From randomly accelerated particles to Lévy walks: weak ergodicity breaking and aging\nSpeaker: Guenter Radons\, Technical Universi ty Chemnitz\, Institute of Physics\, Germany\nDate/Time: Tues.\, March 22\, 12:30\n\nAbstract:\nFor randomly accelerated particles we recently detecte d and analyzed in detail the phenomenon of weak ergodicity breaking (WEB)\, i.e. the inequivalence of ensemble- and time-averaged squared displacement s. These results\, including their aging time dependence\, are relevant for anomalous chaotic diffusion in Hamiltonian systems\, for passive tracer tr ansport in turbulent flows\, and many other systems showing momentum diffus ion. After explaining the basic concepts and results\, I introduce models w ith a similar statistical behavior\, namely the integrated random excursion model\, space-time correlated Lévy walks\, and space-time correlated Lévy flights. A comparison of the WEB related properties of these models reveals surprising differences\, although\, for equivalent parameters\, one would naively expect equivalent results for the mean squared displacements. Our f indings are relevant for distinguishing possible models for the anomalous d iffusion occurring in experimental situations. LAST-MODIFIED:20160316T184644Z LOCATION:IREAP Conference Room (ERB 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:SPECIAL APPLIED DYNAMICS SEMINAR TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20140915T190000Z DTEND:20140915T203000Z DTSTAMP:20260828T094430Z UID:mlct86dmma2tiu512odb1aen14@google.com CREATED:20140903T120137Z DESCRIPTION:Title: Goldstone Gauginos\n\nSpeaker: Jamison Galloway\, NYU\n\ nAbstract: Supersymmetric theories with Dirac gauginos stand to soften the sensitivity of the weak scale to the gaugino mass\, but simple UV completio ns of these scenarios face some difficulty in avoiding the generation of un stable field directions. I'll discuss simple symmetry arguments that preclu de these problems\, and will present implementations of such a symmetry wit hin extensions of conventional weak scale SUSY.\n\nJoin with Google Hangout s: https://hangouts.google.com/hangouts/_/physics.umd.edu/ept-seminar?hceid =bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.mlc t86dmma2tiu512odb1aen14&hs=121 LAST-MODIFIED:20140912T112921Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140605T020000Z DTEND:20140605T030000Z DTSTAMP:20260828T094430Z UID:qrlm7fnigc8ln7p8v5a0kotv7o@google.com CREATED:20140602T171851Z DESCRIPTION:Victor Yakovenko will describe his econophysics work in the new episode “Is Poverty Genetic?” of the TV series "Through the Wormhole with Morgan Freeman” on Science Channel. The first broadcast will be on Wednesd ay\, June 4\, 2014 at 10:00 pm and then repeated several times\, see the sc hedule at http://www.sciencechannel.com/tv-shows/through-the-wormhole/tv-sc hedule.htm\n\nThis appearance on Science Channel follows coverage of Victor ’s econophysics work in Science Magazine last month in the special issue “T he Science of Inequality”\nhttp://www.sciencemag.org/content/344/6186/828.f ull\n LAST-MODIFIED:20140602T171945Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Victor Yakovenko on the Science Channel TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141023T180000Z DTEND:20141023T193000Z DTSTAMP:20260828T094430Z UID:ihi1ob1b11ln4ka5a4knkjg5oo@google.com CREATED:20140828T215131Z DESCRIPTION:Speaker Name: Milton W. Cole\, Department of Physics\n\nSpeake r Institution: Penn State University\n\nTitle: To wet or not to wet? That is the question!\n\nAbstract: If one looks at a leaf of a plant after a ra in\, one sees water droplets of varying sizes. What determines this behavio r? The answer\, known in principle for two centuries\, involves the surface tension of the water itself\, as well as surface tensions at the water-lea f interface. At the microscopic level\, the “wetting” behavior depends on t he interaction between two water molecules compared to that between a water molecule and the leaf.\n \nUnderstanding wetting is important for many tec hnological applications\, including adhesion\, gas storage and separation a nd fluid flow in fine capillaries.\n\nMy group has been studying the proble m of wetting transitions on various surfaces. This transition is a two-dime nsional analog of the familiar three-dimensional vapor-liquid transition\, i.e. there is a line of first-order transitions in the P-T plane\, ending w ith a critical point. The phenomenon can involve liquids as varied as super fluid helium\, mercury and water\, interacting with a wide variety of surfa ces. The common characteristic is a very weak attractive interaction betwee n the adsorbed molecules and the surface in question.\n\nAmong the results presented will be evidence for the first wetting phase transition for water . We predicted this transition in 2004 and it was recently observed at UC I rvine [2\,3]\n\nReferences: \n1. S. M. Gatica and M. W. Cole\, "To wet or n ot to wet: that is the question"\, J. Low Temp. Phys.\, 157\, 111-136 (2009 )\n2. S. M. Gatica\, Xiongce Zhao\, J. K. Johnson and M. W. Cole\, “Wetting transition of water on graphite and other surfaces”\, J. Phys. Chem. B108\ , 11704-11708 (2004)\; Hye-Young Kim\, Maria Cristina dos Santos and Milton W. Cole\, Wetting transitions of water on graphite and graphene\, J. Phys. Chem A118\, 8237-8241 (2014)\n3. S. R. Friedman\, M. Khalil and P. Taborek \, Wetting transition in water\, Phys. Rev. Lett. 111\,226101 (2013) \n\n\n Host: T. Einstein\n\nJoin with Google Hangouts: https://hangouts.google.co m/hangouts/_/physics.umd.edu/cnam-condensed?hceid=bGJrNjYwYTc1YjhqaDdlazZqc jg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ihi1ob1b11ln4ka5a4knkjg5oo&hs =121 LAST-MODIFIED:20141017T180325Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20141117T160000Z DTEND:20141117T170000Z DTSTAMP:20260828T094430Z UID:ssgbe2h2rkakncn8iirs4h33mc@google.com CREATED:20140711T172701Z DESCRIPTION:Speaker Name: David Hall\n\nSpeaker Institution: Amherst Colleg e\n\nTitle: Monopoles in Spinor Bose-Einstein Condensates\n\nAbstract: Di rac's groundbreaking 1931 theory of magnetic monopoles made it possible to consider such elementary particles within the contexts of classical electro dynamics and quantum mechanics. Despite years of searching\, no magnetic mo nopole has been convincingly identified experimentally. Nevertheless\, one can perform experiments in systems that permit the existence of close analo gues of these elusive particles. One such analogue is the Dirac monopole th at we recently created and observed in the synthetic magnetic field generat ed by a spinor Bose-Einstein condensate. The response of the condensate to the presence of a monopole reveals the characteristic features of the syste m envisioned by Dirac. In related experiments\, we create and detect quantu m point defects within the condensate that are analogues of 't Hooft-Poyako v magnetic monopoles\, which are expected to arise as a result of symmetry breaking in grand unified field theories.\nHost: Luis Orozco\nTitle and Abs tract to follow\n\nJoin with Google Hangouts: https://hangouts.google.com/h angouts/_/physics.umd.edu/jqi-seminar?hceid=bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ 1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.ssgbe2h2rkakncn8iirs4h33mc&hs=121 LAST-MODIFIED:20141112T194056Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160404T200000Z DTEND:20160404T210000Z DTSTAMP:20260828T094430Z UID:ct4td8tp9fthg3b0ud0lu8t11o@google.com CREATED:20160331T153030Z DESCRIPTION:Speaker Name: Tatyana Svitkina\n\nSpeaker Institution : Univers ity of Pennsylvania\n\nTitle : Self-assembly of the contractile system in n onmuscle cells\n\nAbstract : Conventional class II myosins are universally responsible for generation of contractile forces in cells. A unique feature of myosin II is an ability to polymerize into bipolar filaments\, which ca n pull on multiple actin filaments in opposite directions. Muscle-specific myosin II is essential for muscle contraction\, whereas nonmuscle myosin II plays central roles in virtually all cell types for cell adhesion\, migrat ion\, cytokinesis\, and tissue morphogenesis. In contrast to a highly order ed and stable sarcomeric pattern of actin and myosin II filaments in striat ed muscle\, the contractile system in nonmuscle cells undergoes constant re modeling. A key element of this dynamic behavior is an ability of nonmuscle myosin II to undergo cycles of activation-inactivation and polymerization- depolymerization\, which are governed by complex regulation. Existence of d ifferent nonmuscle myosin II paralogs that copolymerize with each other in cells makes the remodeling of the contr! actile system in nonmuscle cells e ven more complex. Our recent insights into mechanisms of contractile system assembly and remodeling will be presented. LAST-MODIFIED:20160331T153151Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20140122T200000Z DTEND:20140122T210000Z DTSTAMP:20260828T094430Z UID:67qqdj8h9it4lh8h16vjgdpaq0@google.com CLASS:PUBLIC CREATED:20140115T135226Z DESCRIPTION:Speaker: Julian Struck\n\nInstitution: University of Hamburg\n\ nTitle: Artificial Gauge Fields in Driven Optical Lattices\n\nAbstract: Qu antum gases provide a controllable and isolated environment for the investi gation of model Hamiltonians\, reaching from the weakly-interacting to the strongly-correlated regime. However\, as the constituent particles of these gases are typically neutral they do not respond to electromagnetic fields via the Lorentz force. This is a central limitation towards the simulation of various solid state models involving external electromagnetic fields. In recent years the creation of synthetic gauge fields for ultracold neutral atoms has developed to a promising field that allows overcoming this limita tion. Recently\, we have demonstrated that suitable periodic driving of ato ms in an optical lattice can mimic the effects of a tunable gauge potential . In this talk\, we report on the experimental realization of a spin model with coupled continuous and discrete degrees of freedom on a periodically d riven triangular lattice. As a result of the strong artificial gauge field\ , the bosonic atoms in the lattice show persistent circular currents in ana logy to the cyclotron motion of electrons in magnetic fields. The direction of this mass flow provides the discrete Ising variable. By measuring the m agnetization of the systems we observe a thermally driven Ising-type phase transition from an ordered\, (anti-)ferromagnetic to an unordered\, paramag netic state. Further\, the superfluid ground state with well-defined phases on each lattice site provides continuous XY vector-spin variables. The int erplay of these different degrees of freedom naturally raises the question of coupled order parameters and new universality classes of phase transitio ns. -\n\nHost: Ian Spielman LAST-MODIFIED:20140117T160955Z LOCATION:CSS 2115 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131205T173000Z DTEND:20131205T183000Z DTSTAMP:20260828T094430Z UID:ddi2ok7eep93r1m8pnr4dne8jc@google.com CREATED:20131122T143752Z DESCRIPTION:Title : Quantifying Network Topology Robustness in Adversarial Environment: A Game Theoretic Approach\n\nSpeaker Name: Assane Gueye\n\nSpe aker Institution : NIST\n\nAbstract : Designing network topologies that are robust and resilient to attacks has been and continues to be an important and challenging topic in the area of communication networks. One of the mai n difficulties resides in quantifying the robustness of a network in the pr esence of an intelligent attacker who might exploit the structure of the ne twork topology to design harmful attacks. To capture the strategic nature o f the interactions between a defender and an adversary\, game theoretic mod els have been gaining a lot of interest in the study of the security of com munication networks. In a recent line of research\, network blocking games have been introduced and applied to the analysis of the robustness of netw ork topologies. A network blocking game takes as input the communication m odel and the topology of a network and models the strategic interactions be tween an adversary and the network operator as a two-player game. The Nash equilibrium strategies are then used to predict the most likely attacker’s actions and the attacker’s Nash equilibrium payoff serves as a quantificati on of the vulnerability of the network. In this talk\, I will present the n otion of network blocking games and show how they can be used to derive net work vulnerability metrics by using a series of examples of communication m odels. I will also show how these metrics can be used to design networks th at are robust against attacks and/or strengthen the robustness of existing networks. I will also show how the metrics can be used to identify the most critical links in a network. This is joint work with Prof. Jean C. Walrand \, Prof. Venkat Anantharam (UC Berkeley)\, Dr. Vladimir Marbukh (NIST)\, an d Aron Lazska (Budapest University of Technology and Economics).\n LAST-MODIFIED:20131122T143752Z LOCATION:IREAP Large Conference Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161116T190000Z DTEND:20161116T203000Z DTSTAMP:20260828T094430Z UID:pce8sqsbn6p6vpg1k9h51frld0@google.com CREATED:20161024T134027Z DESCRIPTION:Speaker: Brian Tiburzi\n\nSpeaker Institution: City College of New York\n\nTitle: Going to Extremes: Lattice QCD in External Fields\n\nAbs tract: We give an overview of recent results concerning properties of singl e- and few- nucleon systems computed using lattice QCD. The calculations ar e performed using the external field method\, which allows current matrix e lements to be accessed by studying the field-strength dependence of observa bles. For few-nucleon systems\, these lattice QCD calculations of electrowe ak observables are the first of their kind\, and include matrix elements fo r the photo-disintigration of deuterium\, and the weak proton-proton fusion process. While calculations are performed at unphysically large values of the quark masses\, results exhibit some surprises that allow us to conjectu re how they extrapolate to the physical quark masses. LAST-MODIFIED:20161108T140938Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar - Going to Extremes: Lattice QCD in External Fields TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171016T190000Z DTEND:20171016T203000Z DTSTAMP:20260828T094430Z UID:5bvsuvh8ivc6gfdkik6gl4kus3@google.com CREATED:20171011T131147Z DESCRIPTION:Speaker: Gustavo Burdman\n\nSpeaker Institution: Physics Univer sity of São Paulo\n\nTitle: Hidden Glue Fragmentation and Displaced Vertice s at the LHC\n \nAbstract: We model the fragmentation of hidden glue into g lueballs in theories beyond the standard model where they are the only hadr ons available. We focus on Folded Supersymmetry where the electroweak pair production of squarks and their subsequent annihilation results in a number of glueballs that decay back to the standard model. The fragmentation func tion provides a way to study in detail the distribution of displaced vertic es throughout the detector. \nThe results can be adapted to other models with glueballs such as the Quirky Little Higgs and some realizations of the Twin Higgs. LAST-MODIFIED:20171011T131154Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160511T150000Z DTEND:20160511T160000Z DTSTAMP:20260828T094430Z UID:0ufev4ursrqc9d61frjdr1uc8o@google.com CREATED:20160503T134232Z DESCRIPTION:Speaker: Peter Johnson\n\nSpeaker Affiliation: Dartmouth\n\nTit le: Monogamy of entanglement\, no-cloning\, and dissipative quantum state p reparation\n\nAbstract: Monogamy of entanglement limits the distribution of quantum correlations in a many-body system. The no-cloning theorem states that quantum information cannot be copied. From quantum cryptography to qua ntum chemistry simulations\, these principles govern our approach to quantu m information processing and distinguish it from classical information proc essing. For the most part\, mathematical investigations of the monogamy of entanglement and "no-cloning" have been independent. We make an in-depth co mparison of these two principles\, demonstrating their common origin and ga ining insight from simple examples. Through this pursuit\, we come upon an intriguing "parity difference" between causal and acausal quantum correlati ons (i.e. between quantum channels and states)\, which is not present in cl assical statistical mechanics. We then connect this investigation of quantu m part-whole relationships to the task of dissipatively preparing a many-bo dy entangled state using (quasi-)local resources. We determine conditions u nder which a target state is able to be the unique steady state of frustrat ion-free quasi-local Liouvillian dynamics and discuss some illuminating exa mples.\n\nReferences: JPA 48\, 035307 (2015) and QIC 16\, 0657 (2016)\n LAST-MODIFIED:20160503T134232Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170215T200000Z DTEND:20170215T210000Z DTSTAMP:20260828T094430Z UID:urji1scvsga1n2terd3bqr8l6o@google.com CREATED:20170209T153815Z DESCRIPTION:Speaker Name: Dr. Mohammadreza (Reza) Khorasaninejad\n\nSpeaker Institution : Harvard John A. Paulson School of Engineering and Applied Sc iences\n\nTitle : High Performance Meta-Optics at Visible Wavelengths\n\nAb stract : Metasurfaces have established a new paradigm for controlling the b asic properties of light (amplitude\, phase\, and polarization) with subwav elength spatial resolution by an ultra-thin layer. Planar optics based on t his platform have the potential to replace or complement conventional refra ctive/diffractive optical components. In this seminar\, I will give an over view of our work on dielectric metasurfaces\, which have enabled the realiz ation of high performance components in the visible spectrum. In particular \, I will present our recent works on high numerical aperture lenses (with diffraction limited focusing and subwavelength imaging resolution) and mult ifunctional lenses (with ability to resolve chirality). The physical mechan isms leading to highly efficient metasurfaces\, as well as the design princ iples that enable one to overcome numerous challenges common to both conven tional refractive and diffractive optics\, will be discussed. Finally\, I w ill highlight the role and the sizeable impact that this platform technolog y could have in further shaping the field of optics. \n\n LAST-MODIFIED:20170209T154347Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170907T123000 DTEND;TZID=America/New_York:20170907T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20170907T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nDaniel Lathrop and Itamar Shani\nUniversity of Maryla nd | Department of Physics / IREAP\nTitle: Ultrafast Large-scale Neural Net work Processor on a Chip\nAbstract: Neural networks allow machines to imita te the way in which human intelligence solves problems by inferring from pa st experience. These networks are composed of large arrays of communicating neurons\, each one performing a simple non-linear operation. When combined and trained by variation of connection weights\, the network can perform c omplex perceptive computational tasks such as image and voice recognition a nd complex pattern predictions. When implementing neural networks on conven tional digital processing hardware such as those at the core of our PCs\, a n immense inefficiency stands out: neural network computations are inherent ly parallel\, while computers were designed to perform computations seriall y. This leads to slow computation times and a high toll of energy consumpti on. Here we report a way to overcome this challenge. We implement a silicon chip with thousands\, and potentially millions\, of processing interconnec ted ‘neurons’\, each one operating at 200ps rates. The chip is\, thus\, cap able of performing fully parallel\, highly efficient computation. For the d esign of our network\, we follow the well-established machine learning algo rithms in which interconnections are described by a random sparse directed graph. We show preliminary laboratory measurements of the network dynamics on a chip and discuss its software variations. LAST-MODIFIED:20170911T135459Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171013T150000Z DTEND:20171013T155000Z DTSTAMP:20260828T094430Z UID:53mnusr20aua265csjf8nnihbh@google.com CREATED:20171020T152126Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nGuest lecture: Dan Lathrop: Neural Networks Intro and Application in Research\n\nCourse description: This short course covers the fundamentals of machine learning\, assuming the typical background and motives of a phys icist. It's goal is to give those who attend an understanding of the field and its capabilities\, as well the tools to learn the necessary extensions of the topic to apply it to their physics research. Lectures will include i ntroductions to Python\, Linux\, neural nets\, deep learning\, natural lang uage processing\, imagine recognition/computer vision\, and AI safety.\n\nR SVP for the first friday here: http://bit.ly/2xgpvDE\njustinkterry@gmail.co m LAST-MODIFIED:20171020T152126Z LOCATION:Edward St. John 2208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171204T110000 DTEND;TZID=America/New_York:20171204T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171204T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Arno Rauschenbeutel \n\nTitle: Nonreciprocal Quantum O ptical Devices Based on Chiral Interaction of Confined Light with Spin-Pola rized Atoms\n\nAbstract: The confinement of light in nanophotonic structure s results in an inherent link between the light’s local polarization and it s propagation direction [1]. Remarkably\, this leads to chiral\, i.e.\, pro pagation-direction-dependent effects in the emission and absorption of ligh t by quantum emitters [2]. For example\, when coupling atoms to an evanesce nt field\, the emission rates into counter-propagating optical modes can be come asymmetric [3]. In our group\, we became aware of this chiral light–em itter coupling when studying the interaction of single rubidium atoms with the evanescent part of a light field that is confined by continuous total i nternal reflection in a whispering-gallery-mode (WGM) microresonator [4]. I n the following\, we employed this effect to demonstrate an integrated opti cal isolator [5] as well as an integrated optical circulator [6] which oper ate at the single-photon level and which exhibit low loss. The latter are t he first two examples of a new class of nonreciprocal nanophotonic devices which exploit the chiral interaction of quantum emitters with transversally confined photons. \n[1] K. Y. Bliokh et al. Nat. Photon. 9\, 796 (2015)\n[ 2] P. Lodahl et al. Nature 541\, 473 (2017)\n[3] R. Mitsch et al. Nature Co mmun. 5\, 5713 (2014)\n[4] C. Junge et al. Phys. Rev. Lett. 110\, 213604 (2 013)\n[5] C. Sayrin et al. Phys. Rev. X 5\, 041036 (2015)\n[6] M. Scheucher et al. Science 354\, 1577 (2016) LAST-MODIFIED:20171201T120959Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161012T190000Z DTEND:20161012T200000Z DTSTAMP:20260828T094430Z UID:h2tjtadsi7au1c2238evcgu5js@google.com CREATED:20161006T131246Z DESCRIPTION:Speaker Name: Dr. Kurt Jacobs\n\nSpeaker Institution : Computat ional Sciences Division at Army Research Laboratory\n\nTitle : Quantum Netw orks\, Control\, and Metrology\n\nAbstract : I'll first give an overview of the (relatively new) programs in quantum science and technology at Army Re search Laboratory (ARL). I'll then discuss various topics that we are worki ng on\, most of which are related in various ways to quantum networks. I wi ll also discuss specific projects on quantum metrology with distributed sen sors\, and the development of classical networking protocols for controllin g and interfacing with quantum networks.\n LAST-MODIFIED:20161006T131342Z LOCATION:LPS Seminar SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180419T123000 DTEND;TZID=America/New_York:20180419T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180419T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: William Dorland\n\nSpeaker Institution: UMD Physics\n\ nTitle: Turbulence closure ideas from plasma physics\n\nAbstract: First-pri nciples turbulence simulations are expensive but very useful in many contex ts. One approach to improving one's ability to predict experimental or obse rvational data is to design algorithms for ever more processors\, allowing ever higher (and more realistic) resolution. But one can also try to work i n the opposite direction\, developing closures to reduce the resource deman ds of computations. In a typical high-resolution turbulence simulation that I undertake\, there are O(10**9) spectral amplitudes. Only a tiny percenta ge of these modes are excited to any appreciable level. I will discuss (and seek advice from the audience!) approaches we are pursuing to develop algo rithms that solve a closed (or somewhat reduced) first-principles system wi th as little resolution as should be required. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171010T160000 DTEND;TZID=America/New_York:20171010T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171010T160000 CREATED:20170809T180226Z DESCRIPTION:Charles Tarrio\, NIST Gaithersburg\nHosted by Howard Milchberg\ n\nMoore’s Law and the Physics of Manufacturing Nanoscale Devices\n\nOver 5 0 years ago\, Gordon Moore postulated that the number of devices in an inte grated circuit would double roughly every 1.5-2 years. Lithography is the technology used to keep this up for the last 50 years. Lithography has gon e through several iterations\, and is currently going through a paradigm sh ift from deep ultraviolet with a wavelength of 193 nm\, to extreme ultravio let (EUV) with a wavelength of 13.5 nm. The transition to such a short wav elength has presented many scientific and technological challenges. I'll d iscuss the history of semiconductor lithography and how potential "showstop pers" in the EUV have been overcome.\n\n\n\n \n\n LAST-MODIFIED:20171005T142426Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171214T160000Z DTEND:20171214T173000Z DTSTAMP:20260828T094430Z UID:1g9cj3cnnkp3r174mmvoglo8m1@google.com CREATED:20171211T145122Z DESCRIPTION:Speaker: Barak Dayan\n\nAffiliation: JILA/Weizmann Institute of Science\, Israel\n\nTitle: Passive photon-atom gates\n\nAbstract: Determin istic quantum interactions between single photons and single quantum emitte rs can serve as a valuable building block for the distribution of quantum i nformation between remote systems. Deterministic photon-atom state transfer has so far been demonstrated by using protocols that include synchronized control pulses or active feedback. In this talk I will present our recent d emonstration of a completely passive swap gate between the states of a sing le photon and a single atom [1]. The underlying mechanism is single-photon Raman interaction (SPRINT) - an interference-based effect in which a photon ic qubit deterministically controls the state of a material qubit encoded i n the two ground states of a Lambda system\, and vice versa [2-4]. In our s ystem we used a nanofiber-coupled microsphere resonator coupled to single R b atoms to demonstrate swapping of a photonic qubit into the atom and back\ , attaining nonclassical fidelities in both directions. This open-system sc heme is applicable to any waveguide-coupled Lambda system (it has been also demonstrated with superconducting qubits by Nakamura and Yamamoto [5-6]) a nd can serve as a basis for a variety of other photon-"atom" interactions - from universal gates\, through QND measurement\, to the preparations of no nclassical states of light such as single-photon subtracted or added states \, Fock states and cat states. All these interactions takes place "automati cally" at the timescale of the cavity-enhanced spontaneous emission time. R equiring no control fields or feedback protocol\, this scheme provides a ve rsatile building block for the modular scaling up of quantum information pr ocessing systems. LAST-MODIFIED:20171212T144447Z LOCATION:PSC 2136\, College Park\, MD 20742 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180227T160000 DTEND;TZID=America/New_York:20180227T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180227T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Martin Savage\n\nSpeaker Institution: UW Seattle\ n\nTitle: Quantum Chromodynamics in the Exascale Era with the Emergence of Quantum Computing \n\nAbstract: A century of coherent experimental and theo retical investigations\nuncovered the laws of nature that underly nuclear p hysics — Quantum Chromodynamics (QCD) and the electroweak interactions. Wh ile analytic techniques of quantum field theory have played a key role in u nderstanding the dynamics of matter in high energy processes\, they become inapplicable to low-energy nuclear structure and reactions\, and dense syst ems. Expected increases in computational resources into the exascale era w ill enable Lattice QCD calculations to determine a range of important stron g interaction processes directly from QCD. However\, important finite densi ty systems\, non-equilibrium systems\, and inelastic processes are expected to remain a challenge for conventional computation. In this presentation\, I will discuss the state-of-the-art Lattice QCD calculations\, progress th at is expected in the near future\, and the potential of quantum computing to address Grand Challenge problems in nuclear physics. \n\nHosted by Zohre h Davoudi LAST-MODIFIED:20180509T201649Z LOCATION:Lobby of the Physical Sciences Complex SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170419T200000Z DTEND:20170419T210000Z DTSTAMP:20260828T094430Z UID:8EE053D4-4AA5-4B82-AE43-6D983783EA4D CREATED:20170405T202715Z DESCRIPTION:Speaker Name: Dr. Luca Comisso\n\nSpeaker Institution : Princet on University\n\nTitle : Plasmoid Instability in General Current Sheets\n\n Abstract : We present the recent formulation of a general theory of the ons et and development of the plasmoid instability [1]. We consider the general problem of a reconnecting current sheet that can evolve in time\, rather t han assuming a fixed Sweet-Parker current sheet. The new theoretical framew ork has lead to completely new results\, which have shown that previously o btained power laws are insufficient to capture the correct properties of th e plasmoid instability. The new scaling laws are shown to depend on the ini tial perturbation amplitude\, the characteristic rate of current sheet evol ution\, and the Lundquist number. The detailed dynamics of the instability is also elucidated\, and shown to comprise of a long period of quiescence f ollowed by sudden growth over a short time scale. \n\n[1] L. Comisso\, M. L ingam\, Y.-M. Huang\, A. Bhattacharjee\, Phys. Plasmas 23\, 100702 (2016)\n Title of Event: \nEdits: LAST-MODIFIED:20170405T202812Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T190000Z DTEND:20180316T203000Z DTSTAMP:20260828T094430Z UID:0dokb2092s4dqt3t3m3qj7aqnc@google.com CREATED:20180312T160319Z DESCRIPTION:

Speaker: \;Dan Harlow

Speaker Institution: Massachusetts Ins titute of Technology

Title: The Factorization Problem in Jackiw-Teit elboim Gravity

Abstract: The factorization problem is an interesting issue in holographic gravity: how can a CFT Hilbert space which tensor fac torizes be dual to a gravitational theory whose Hilbert space does not seem to? I study this problem in the exactly-soluble context of the Jackiw-Teit elboim gravity in 1+1 dimensions\, constructing its full covariant phase sp ace and realizing the factorization problem as a tension between the Euclid ean and Lorentzian formulations of the theory. I will also describe a semi classical evaluation of the wave functional for the Hartle-Hawking state. LAST-MODIFIED:20180312T160518Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171018T150000Z DTEND:20171018T160000Z DTSTAMP:20260828T094430Z UID:7df37qq7tci3kbtp93i7jkd9v4@google.com CREATED:20170912T134358Z DESCRIPTION:Abstract: Some remarkably universal empirical formulas are used to characterize the primary response of complex systems. Stretched-exponen tial relaxation has been used since 1854 for time-dependent response\, non- classical critical scaling has been used since 1893 for temperature-depende nt behavior\, and 1/f noise has been used since 1925 for frequency-dependen t fluctuations. I will describe a common physical foundation for all these formulas. The ideas are based on “nanothermodynamics\,” where nanometer-siz ed systems couple to a local thermal bath from the surrounding ensemble of similarly small systems. The mechanism can be attributed to strict adherenc e to the laws of thermodynamics: non-extensive energy is conserved by inclu ding Hill’s subdivision potential\, and maximum entropy is maintained by tr ansferring information to the surrounding bath. Alternatively the mechanism may involve the statistics of indistinguishable particles for equivalent s tates. I will emphasize how using these ideas\, standard theories and simul ations yield the empirical formulas\, plus deviations from the formulas tha t often match measured behavior. Finally\, I plan to present some recent re sults showing that molecular dynamics simulations of several models exhibit anomalous fluctuations in the local energy. Specifically\, small systems c ontaining 1-1000 atoms inside much larger simulations have energy fluctuati ons that differ significantly from a fluctuation-dissipation relation\, som etimes by an order of magnitude or more. LAST-MODIFIED:20171016T124231Z LOCATION:Marker Room\, Chemistry 0112 NOTE: SPECIAL DATE\, TIME AND LOCATIO N SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Joint Informal Statistical Physics Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161115T190000Z DTEND:20161115T200000Z DTSTAMP:20260828T094430Z UID:sari52kuqbba7q6sd188sm508g@google.com CREATED:20161108T172845Z DESCRIPTION:Speaker Name: Professor Elaine Oran\n\nSpeaker Institution : UM D\n \nTitle : Flames\, Fire Whirls\, and Blue Whirls: What more can there b e?\n\nAbstract : The growing worldwide demand to reduce emissions from comb ustion calls for development of alternative technologies for high-efficienc y and low-emission combustion. Whereas fire whirls are known for their inte nse and disastrous threat to life and surrounding environments\, their swir l properties and thus higher combustion efficiency imply an unexploited pot ential for highly efficient\, low-emission combustion. In studying fire whi rls over water for oil-spill cleanup\, we discovered a beautiful\, swirling flame phenomenon\, the "blue whirl"\, which evolves from a fire whirl and burns with nearly soot-free combustion. Understanding and control of the bl ue whirl and its predecessor\, the fire whirl\, will suggest new ways for f uel-spill remediation\, reduced-pollution combustion\, and fluid mechanics research. \n LAST-MODIFIED:20161108T173003Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170614T143000Z DTEND:20170614T160000Z DTSTAMP:20260828T094430Z UID:3ne306v7maf2jfq6q51vcm46hc@google.com CREATED:20170607T141027Z DESCRIPTION:Speaker: Mengjiao Xiao\n\nSpeaker Institution: University of Ma ryland\n\nTitle: The JUNO Experiment and the Central Detector Calibration\n \nAbstract: We have many open questions about the fundamental properties of neutrino.\nJiangmen Underground Neutrino Observatory (JUNO) experiment is designed to\ndevelop the largest liquid scintillator detector to date for m ultiple physics purposes\,\nincluding determination of the neutrino mass hi erarchy (the primary goal)\, precision\nmeasurements of other neutrino osci llation parameters\, etc.\nThe center detector of JUNO is an acrylic sphere with a diameter of 35.4 m\ncontaining about 20 kiloton of liquid scintilla tor as the target\, covered by ~18000 20"\;\nand 25000 3” photomultipli er tubes (PMTs). To determine the neutrino mass\nhierarchy\, the JUNO centr al detector needs to achieve an excellent energy resolution\nand energy non linearity which require a thorough calibration to the central detector.\nIn this talk\, I will introduce the JUNO experiment\, discuss the design of c entral\ndetector with emphasis on how to calibrate such a large detector\, and present an\noverall status of the project. LAST-MODIFIED:20170607T141027Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180418T150000Z DTEND:20180418T160000Z DTSTAMP:20260828T094430Z UID:48ac72bdkect81qpjlelameot6@google.com CREATED:20180412T124113Z DESCRIPTION:Speaker: Akua Asa-Awuku\, UMCP\, Chemical and Biomolecular E ngineering

Title: Why are Aerosols Important? Understanding t he Links between Air Quality and Climate

Abstract:&nbs p\;Aerosols\, or particles\, emitted into the air have adverse ef fects for regional air quality and health. \; In addition\, aerosols si gnificantly impact earth’s climate and the hydrological cycle. They can dir ectly reflect the amount of incoming solar radiation into space\; by acting as cloud condensation nuclei (CCN)\, they can in directly impact climate by affecting cloud albedo. Our current assessment o f the interactions of aerosols and clouds is uncertain and parameters used to estimate cloud droplet formation in global climate models are not well c onstrained. Organic aerosols attribute much of the uncertainty in these est imates and are known to affect the ability of aerosol to form cloud droplet s by i) providing solute\, thus reducing the equilibrium water vapor pressu re of the droplet and ii) acting as surfactants capable of depressing surfa ce tension\, and potentially\, growth kinetics. Understanding the chemical and thermodynamic properties that control the ability of particles to form droplets\, \;CCN \;activity\ , and droplet growth are necessary for constraining impacts on the hydrolog ical cycle and uncertainties from the aerosol indirect effect. \; In pa rticular\, quantifying organic effects that are not well understood are imp ortant for predicting water uptake\, \;CCN \;concentrations and cloud droplet formation. \; \; In this presentation\, we explore and identify parameters that affect dropl et growth and discuss the links between cloud formation and air quality.

LAST-MODIFIED:20180412T124221Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161028T180000Z DTEND:20161028T190000Z DTSTAMP:20260828T094430Z UID:pfomssp592fbsioe42fv12fgp8@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.pfomssp592fbsio e42fv12fgp8 CREATED:20161027T131056Z DESCRIPTION:Special Seminar\, Friday Oct 28\, 2pm\, PSC 2136\nSpeaker: Chet an Nayak (Univ. California\, Santa Barbara\, Station Q)\nTitle: "Time Cryst als"\n\nJoin with Google Hangouts: https://plus.google.com/hangouts/_/calen dar/bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ. pfomssp592fbsioe42fv12fgp8?hs=121 LAST-MODIFIED:20161027T131056Z LOCATION:PSC 2136\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180305T213000Z DTEND:20180305T223000Z DTSTAMP:20260828T094430Z UID:4j66ivt7vr3f92iatckf3i6o41@google.com CREATED:20180217T015105Z DESCRIPTION:Speaker Name: Simona Giacintucci\n\nSpeaker Institution: Naval Research Laboratory\n\nAbstract: Radio minihalos are rare diffuse synchrotr on sources found in the cool cores of a number of galaxy clusters. Their ex istence requires magnetic fields and ultra-relativistic electrons to be dis tributed throughout a large fraction of the cluster central core. It has be en proposed that sloshing motions of the cool gas in the core may be respon sible for the origin of minihalos. In particular\, turbulence\, generated b y these motions\, can reaccelerate seed electrons (e.g.\, from past activit y of the central AGN) to ultra-relativistic energies and produce diffuse ra dio synchrotron emission that is spatially coincident with the sloshing reg ion. In this talk\, I will present striking examples of minihalos supportin g the sloshing scenario. I will also present results of our recent statisti cal study of minihalos and their correlation with the X-ray and Sunyaev-Zel 'dovich (SZ) properties of the cluster hosts.\n\nNotes: Coffee\, Tea & Snac ks 4:15-4:30 PM LAST-MODIFIED:20180217T015105Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170410T193000Z DTEND:20170410T203000Z DTSTAMP:20260828T094430Z UID:k09cishfigv3chqs3acdn10ung@google.com CREATED:20170331T195928Z DESCRIPTION:Speaker Name: Dr. Regina Caputo\n\nSpeaker Institution : NASA/G SFC\n\nTitle : JSI Colloquium: "Dark Matters: The Search for the Universe's Missing Mass"\n\nAbstract : The era of precision cosmology revealed that 8 0% of the matter in the universe is non-luminous\, or dark. The nature of d ark matter is crucial to our understanding of the structure and evolution o f the universe after the big bang. One promising dark matter candidate\, mo tivated by both particle- and astrophysics\, is the Weakly Interacting Mass ive Particle (WIMP). The detection of this elusive particle requires a mult i-pronged approach. I will present results from searches for WIMPs using hi gh-energy gamma-rays from the Fermi Gamma-Ray Space Telescope. I will also discuss complementary detection techniques and their necessity for dark mat ter discovery. Although no WIMP has yet been found\, I will discuss what is ruled out so far\, current ongoing searches\, and our best prospects for f inding the source of the universe's missing mass.\n\nNotes: Refreshments wi ll be available outside of PSC 1136 beginning at 3 PM.\n LAST-MODIFIED:20170331T200047Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium: "Dark Matters: The Search for the Universe's Missin g Mass" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170426T190000Z DTEND:20170426T200000Z DTSTAMP:20260828T094430Z UID:ff8gkpijmq36ldtgdoet8lts24@google.com CREATED:20170420T131452Z DESCRIPTION:Speaker Name: Dr. Jonathan P. Gardner\n\nSpeaker Institution : NASA's Goddard Space Flight Center\n\nTitle : The James Webb Telescope\n \n Abstract : The James Webb Space Telescope is the scientific successor to th e Hubble and Spitzer Space Telescopes. It will be a large (6.6m) cold (50K) telescope launched into orbit around the second Earth-Sun Lagrange point. It is a partnership of NASA with the European and Canadian Space Agencies. The science goals for JWST include the formation of the first stars and gal axies in the early universe\; the chemical\, morphological and dynamical bu ildup of galaxies\, the formation of stars and planetary systems and unders tanding our Solar System. Webb has four instruments: The Near-Infrared Came ra\, the Near-Infrared multi-object Spectrograph\, and the Near-Infrared Im ager and Slitless Spectrograph will cover the wavelength range 0.6 to 5 mic rons\, while the Mid-Infrared Instrument will do both imaging and spectrosc opy from 5 to 28.5 microns. The observatory is confirmed for launch in 2018 \; the design is complete and it is in its construction and test phase. Rec ent progress includes the assembly of the telescope and instruments\, and p reparation for the final cryogenic test. LAST-MODIFIED:20170420T131657Z LOCATION:LPS Seminar SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161203T150000Z DTEND:20161203T170000Z DTSTAMP:20260828T094430Z UID:kv3mbav6ivkepog2unef3q9d08@google.com CREATED:20160926T202113Z DESCRIPTION:Speaker: Bill Dorland\n\n\n In this talk\, I will focus on ques tions surrounding the threat of a nuclear detonation by an unidentified att acker.\nHow can a country best protect itself against nuclear terrorism?\nW hat are the technical limits of attribution after the fact?\nDeterrence has long been the central pillar of nuclear defense. How would deterrence work against non-state actors?\nWhat does deterrence theory say about foes who have no capacity to deliver a nuclear warhead by conventional means?\n\nRec ently\, I worked on these questions with a panel of technical experts. I wi ll present some of our more interesting findings\, together with a non-clas sified (because I do not have security clearances!) survey of the technical issues that underlie each of these questions.\n\n If you plan to attend\, here is a homework problem\, to be thought about about talked about with yo ur friends before you arrive. After the fall of the Soviet Union\, there we re suddenly many potentially poorly guarded nuclear weapons in the world. Perhaps some are unaccounted for even today. Let us stipulate that missing Soviet weapons presently comprise the greatest nuclear threat to Western de mocracies. If you were the American President\, what would you do to protec t New York from this particular threat?\n \n https://sites.google.com/a/phy sics.umd.edu/saturday-morning-physics/home\n\n LAST-MODIFIED:20160926T202235Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Physics and Society Nuclear Forensics: Where physics and policy meet TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180129T210000Z DTEND:20180129T220000Z DTSTAMP:20260828T094430Z UID:2vakr2f0vh6ktduln2ofg1cus5@google.com CREATED:20180119T144304Z DESCRIPTION:Speaker Name: Dr. Gregg Duncan\n\nSpeaker Institution: UMD Fisc hell Department of Bioengineering\n\nTitle: Microstructural Alterations of Mucus in Obstructive Lung Diseases\n\nSpeaker Institution: UMD Fischell Dep artment of Bioengineering\nNotes: http://www.marylandbiophysics.umd.edu/sem inars/spring2018.php\nAbstract: There is a strong clinical need for sensiti ve biomarkers of disease severity in obstructive lung diseases such as asth ma\, chronic obstructive pulmonary disease (COPD)\, and cystic fibrosis (CF ). The role of airway mucus in the progression of these diseases has yet to be clearly determined and as a result\, reliable mucus biomarkers have not been established. Prior assessments of mucus collected from individuals af flicted with these diseases have been limited to determining bulk macroscop ic properties. However\, these measurements are unable to probe mucus prope rties on microscopic length scales relevant to key players in the progressi on of obstructive lung diseases such as viruses\, bacteria\, neutrophils\, and eosinophils.\n\nIn this work\, we employed a nanoparticle-based biophys ical measurement technique capable of detecting the microstructural propert ies of mucus and suggest its role in the progression of obstructive lung di seases. Specifically\, we use the transport behavior of muco-inert nanopart icle probes within CF mucus produced by a cough\, known as sputum\, as an i ndication of pore sizes within the sputum mesh network. We mechanistically demonstrate how changes in the biomolecular properties of sputum lead to th e alteration of microstructure. Importantly\, we found that a reduction in pore sizes within sputum correlates with impairment of lung function in ind ividuals with CF. Our results give new insights into the CF lung airway mic roenvironment and suggest mucus/sputum microstructure may serve as a non-in vasive biomarker for disease severity and outcome measure for new therapies in CF and other related obstructive lung diseases.\n LAST-MODIFIED:20180119T144827Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180430T200000Z DTEND:20180430T213000Z DTSTAMP:20260828T094430Z UID:114nn6obeh2rfu460bg9a9a6lr@google.com CREATED:20180419T131639Z DESCRIPTION:Speaker: Mark Van Raamsdonk\n\nSpeaker Institution: University of British Columbia\n\nTitle: Gravitational physics from quantum informatio n constraints\n\nAbstract: In this talk\, I will explain how the study of e ntanglement in conformal field theories\nleads directly to nonlinear gravit ational physics\, without any assumptions from string theory\nor the AdS/CF T correspondence. In particular\, the entanglement entropies for ball-shape d regions\n(up to second order in perturbations about the vacuum state) in a certain class of CFT states\nmatch precisely with extremal surface areas in associated asymptotically AdS geometries\, and\nconstraints on entanglem ent entropies imply that these geometries satisfy Einstein's equations\nto second order in perturbation theory around empty AdS space. I will also sho w that other constraints\nfrom quantum information theory suggest new gravi tational positive energy theorems. LAST-MODIFIED:20180420T161605Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170419T200000Z DTEND:20170419T213000Z DTSTAMP:20260828T094430Z UID:61mmefl2np4vpv6i3n7ca0dee4@google.com CREATED:20170414T152337Z DESCRIPTION:Speaker Name: John Paul Chou\n\nSpeaker Institution : Rutgers U niversity\n\nTitle: "New Physics Searches with Multijets at the LHC"\n\nAb stract : The great puzzle of the LHC is the paucity of evidence for new phy sics\, despite two years of proton-proton collisions at 13 TeV. A simple ex planation for this fact could be that new physics processes decay predomina ntly into light (non-top) quarks. Without extra leptons\, photons\, or miss ing momentum\, Standard Model multijet backgrounds dominate. This is a daun ting proposition because theoretical considerations prefer new particles th at could easily be as light as 100 GeV. The experimental challenges then ar e three fold: 1) recording events when the effective mass of the event is w ell below the current un-prescaled trigger thresholds\, 2) finding discrimi nating variables that can reduce the multijet background by several orders of magnitude\, and 3) robustly predicting the background with a minimum of theoretical guidance. In this seminar\, I will begin by considering previou s searches for new physics in multijet final states\, discussing the pros a nd cons of the methods used. I will then examine a new technique that elega ntly meets all three of the aforementioned challenges for a broad class of final state topologies. I will demonstrate the method’s sensitivity by appl ying it to a search for light pair-produced stop squarks that each decay in to four light quarks\, a topology that arises in natural R-parity-violating supersymmetry. I conclude with a discussion of the potential of this techn ique for other searches in the context of natural supersymmetry.\n LAST-MODIFIED:20170414T152524Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180905T150000Z DTEND:20180905T160000Z DTSTAMP:20260828T094430Z UID:2h6vfam3gqfomjpq43gq6hhvbu@google.com CREATED:20180904T174820Z DESCRIPTION:Speaker: Maissam Barkeshli\, University of Maryland\n\nTitle: Universal logical gate sets with constant time overhead in quantum error \ ncorrecting codes\n\nAbstract: A fundamental question in the theory of qua ntum computation is to understand the ultimate space-time resource costs fo r performing a universal set of logical quantum gates to arbitrary precisio n. To date\, all proposed schemes for implementing a universal logical gate set\, such as magic state distillation or code switching\, require a subst antial space-time overhead\, including a time overhead that necessarily div erges in the limit of vanishing logical error rate. I will present some new results in the theory of Turaev-Viro topological quantum error correcting codes that demonstrate how braids and Dehn twists can be achieved through c onstant depth unitary circuits\, in the limit of arbitrarily large code dis tance. When applied to specific types of codes\, our results demonstrate th at a universal logical gate set can be implemented on encoded qubits throu gh a constant depth circuit\, and without increasing the asymptotic scaling of the space overhead. The resulting space-time overhead is optimal for to pological codes with local syndromes. LAST-MODIFIED:20180904T175102Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170105T180000Z DTEND:20170105T190000Z DTSTAMP:20260828T094430Z UID:q52kste5me0lhq6g5rj4sphqmo@google.com CREATED:20170104T131125Z DESCRIPTION:TITLE: Drainage solutions for quantum systems\nSPEAKER/AFFILIAT ION: Victor Albert\, Yale University\nABSTRACT:\nLindbladians\, one of the simplest extensions of Hamiltonian-based quantum mechanics\, are used to de scribe “drainage” (i.e.\, decay) and decoherence of a quantum system induce d by the system's environment. While traditionally viewed as detrimental to fragile quantum properties\, a tunable environment offers the ability to d rive the system toward exotic phases of matter\, which may be difficult to stabilize in nature\, or toward protected subspaces\, which can be used to store and process quantum information. An important property of Lindbladian s is their behavior in the limit of infinite time\, and in this talk I will discuss a formula for the map corresponding to infinite-time Lindbladian e volution. This formula allows us to determine to what extent decay affects a system's linear or adiabatic response. It also allows us to determine geo metrical structures (holonomy\, curvature\, and metric) associated with adi abatically deformed steady-state subspaces. LAST-MODIFIED:20170104T131125Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170906T190000Z DTEND:20170906T203000Z DTSTAMP:20260828T094430Z UID:2d2esgrrcmibn1u4v8dvq1svf5@google.com CREATED:20170825T132121Z DESCRIPTION:Speaker: Antony Speranza\n\nSpeaker Institution: University of Maryland\n\nTitle: Local phase space and edge modes for diffeomorphism-inva riant theories\n\nAbstract: Local subregions and observables are a central concept in quantum field theories\; however\, it is difficult to give meani ng to these notions in gravitational theories due to diffeomorphism invaria nce. In this talk\, I will describe a way of characterizing local subregio ns and their associated observables in gravitational theories using the ext ended phase space construction of Donnelly and Freidel. This involves intr oducing new degrees of freedom living at the boundary of the subregion\, wh ose purpose is to restore invariance under diffeomorphisms that was broken by the subregion's presence. These edge modes then allow for a diff-invari ant characterization of observables within the subregion\, and also contrib ute to the subregion's entanglement entropy. I will further discuss the re levance of the edge mode entanglement to the entropy of black holes\, where it may provide a statistical interpretation of the Wald entropy within the low energy effective description. LAST-MODIFIED:20170830T141440Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171101T190000Z DTEND:20171101T200000Z DTSTAMP:20260828T094430Z UID:1neqsng7fnrpnqq07tbtc2porr@google.com CREATED:20171027T132703Z DESCRIPTION:Speaker: Dr. Kevin D. Osborn\n\nTitle: Reversible topological logic: Fluxons substantiate a fast model of efficient gates\n\nAbstract:\nE nergy efficiency has become a key metric for conventional computing\, which uses irreversible logic gates. As we approach the end of CMOS scaling\, di gital reversible gates are studied as well as topological gates. Though rar e in demonstrations\, reversible gates generally follow a standard adiabati c model\, where there is an inverse relationship between energy usage and g ate time. We study topological entities called fluxons as bits in newly des igned reversible gates. These fluxons are known to arise in long Josephson junctions (LJJs)\, representing topological solitons in the Sine-Gordon equ ation. Circuit interfaces of one or two cells connect LJJs to form gates\, such that incoming fluxons temporally exchange energy with the interface be fore another particle is emitted in the forward direction. This contrasts r elatively simple boundaries\, such as the open boundary of a LJJ which can convert forward traveling fluxon to reflected antifluxon and chaotic models . The gates deterministically reemit the energy in an “ouput” LJJ as a flux on or antifluxon\, one of two degenerate (equal-energy) particles with oppo site flux. This process conserves potential energy\, unlike standard irrev ersible logic\, of either CMOS and superconducting technology\, which dissi pates stored (potential) charge or flux state energy. To develop the concep ts\, a fundamental 1-bit gats are presented along with a related 2-bit gate . Such scattering-based gates\, unlike standard adiabatic reversible gates\ , allow gate times on the same order as the response time. The technology p rovides a promising alternative to a famous but impractical ballistic model . The dynamics simulated generally have many degrees of freedom\, equal to approximately twice the number of JJs\, where the LJJ itself is represented using many a JJ array and in the continuum regime of a LJJ. However\, the gates can also be understood with a two-coordinate model\, by using candida te excitations which asymptotically evolve into topological excitations of LJJ. The gate switching is shown to be influenced by large mass coupling in the reduced model from large capacitances used in the interface. While irr eversible gates dissipate at least as much energy as the potential energy p resented at switching\, these fast reversible gates can dissipate as little as 3%. LAST-MODIFIED:20171101T133808Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171130T193000Z DTEND:20171130T210000Z DTSTAMP:20260828T094430Z UID:5e18vjinsk5e43ao16inhjfc1e@google.com CREATED:20170831T160902Z DESCRIPTION:Speaker: Christoph Lehner\n\nSpeaker Institution: Brookhaven Na tional Lab\n\nTitle: The hadronic vacuum polarization from the lattice and experiment\n\nAbstract: I will present a precise first-principles computati on of the hadronic\nvacuum polarization from lattice QCD+QED at physical pi on mass. I will also\ncontrast the result to experimental determinations f rom e+e- scattering and\nhighlight the impact to the muon anomalous magneti c moment. LAST-MODIFIED:20171115T195045Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170926T160000 DTEND;TZID=America/New_York:20170926T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20170926T160000 CREATED:20170809T180226Z DESCRIPTION:Charles Reyl\, Select Equity Group\n\nLife after grad school fo r the quantitatively inclined - Big banks\, start-ups\, and the great in-be tween LAST-MODIFIED:20170905T152117Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161010T150000Z DTEND:20161010T163000Z DTSTAMP:20260828T094430Z UID:ga8900qfoesgqsalqjj4f6n35o@google.com CREATED:20160926T124113Z DESCRIPTION:Speaker: Raul Briceno\n\nSpeaker Institution: Jefferson Lab\n\n Title: The Isoscalar Sector of QCD\n\nAbstract: Carrying the quantum number s of the vacuum\, the isoscalar-scalar sector of quantum chromodynamics (QC D) is perhaps one the most interesting channels of nuclear physics. Beyond playing a crucial role in a range of phenomenologically important processes \, it hosts some some of the most intriguing states of QCD. For example\, g lueballs\, which have long been upheld as a smoking gun of the low-energy v alidity of QCD\, are expected to appear in this channel. Just like the vast majority of states in the QCD spectrum\, these would need to be resonances whose existence is deduced from the dynamical enhancements in the cross se ctions of their byproducts. In this talk\, I discuss a framework to rigorou sly study such states and present the first exploration of this sector of Q CD using the only non-perturbative tool presently at our disposal\, lattice QCD. I restrict my attention to low energies and discuss the manifestation of the lightest of all hadronic resonances\, the sigma/f0(500)\, in these calculations. LAST-MODIFIED:20161005T154517Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar - The Isoscalar Sector of QCD TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161128T200000Z DTEND:20161128T213000Z DTSTAMP:20260828T094430Z UID:nm5vjucqt71mn8e0rlcu1t598g@google.com CREATED:20161104T130853Z DESCRIPTION:Speaker: Tim Adamo\n\nSpeaker Institution: Imperial College\n\n Title: General relativity as a 2d CFT\n\nAbstract: New results in the study of scattering amplitudes suggest a formulation of general relativity (and its supersymmetric extensions) which is radically different from the usual Einstein-Hilbert action. I will discuss one such alternative\, which is a c hiral\, first-order CFT in two-dimensions. When coupled to a space-time met ric\, we will see that the conditions for quantum consistency of the 2d CFT are equivalent to the vacuum Einstein equations in space-time. Remarkably\ , these are the only conditions imposed on the space-time metric: there are none of the higher-derivative corrections which appear in ordinary string theory. LAST-MODIFIED:20161111T200425Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar - General relativity as a 2d CFT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160914T190000Z DTEND:20160914T200000Z DTSTAMP:20260828T094430Z UID:6is5u2kuirv9jebmqcivcpf8ag@google.com CREATED:20160908T131610Z DESCRIPTION:Speaker Name: Gennady Shvets\n\nSpeaker Institution : Physics\, The University of Texas at Austin\, Applied and Engineering Physics at Cor nell University\n\nTitle: Active Graphene-Integrated Plasmonic Metasurface s and Their Applications: From Motion Detection to Polarization Control of Infrared Light\n \nAbstract : Plasmonic metasurfaces enhance light-matter i nteraction by focusing light into extremely subwavelength dimensions. These carefully designed structures have been used in extremely thin optical com ponent which can mold the wavefront\, with exciting applications in optical lenses\, beam steering\, and biosensing applications. Adding dynamic tunab ility to these devices opens up the possibility for new application in sing le pixel detection and 3D imaging as well as optical modulators and switche s. However the existing approaches for designing active optical devices in infrared\, are either slow or have small refractive index change. Integrati ng plasmonic metasurfaces with single-layer graphene (SLG) opens exciting o pportunities for developing active plasmonic devices because the amplitude and phase of the transmitted and reflected light can be rapidly modulated b y injecting charge carriers into graphene using field-effect gating. I will describe our recent experimental results demonstrating strong phase modula tion of mid-infrared light. The phase shifting due to electric gating of th e SLG was measured using a Michelson interferometer\, and further utilized to demonstrate an electrically controlled (i.e. no moving parts) interferom etry capable of measuring distances with sub-micron accuracy. Because of th e potentially nanosecond-scale measurement time\, active metasurfaces repre sent a promising platform for ultra-fast standoff detection. Finally\, we d emonstrate that\, by the judicious choice of a strongly anisotropic metasur face\, the graphene-controlled phase shift of light can be rendered polariz ation-dependent\, thereby modulating the polarization state (e.g.\, the ell ipticity) of the reflected light. These results pave the way for novel high -speed graphene-based optical devices and sensors such as polarimeters\, el lipsometers\, and frequency modulators. LAST-MODIFIED:20160908T131739Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180327T160000 DTEND;TZID=America/New_York:20180327T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180327T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Liang Fu

Speaker Institution: MIT

T itle: New quantum transport phenomena under large electric and magnetic fie lds \;

Ab stract: \; The discovery of topological insulators and semimetals has b rought into focus Berry phase effects on transport properties of quantum so lids. This talk will begin with an overview of anomalous Hall effect driven by Berry phase mechanism. I will then turn to two new transport phenomena. The first is the second-order Hall effect\, by which a transverse current occurs in second-order response to an external electric field. I will show that the nonlinear Hall conductivitiy in the DC or low-frequency limit can be nonzero in time-reversal-invariant and inversion-breaking materials\, an d is governed by the dipole moment of Berry curvature in momentum space.

The second part of this talk is on thermoelectric effect under a large magnetic field. I will show that the thermopower of semimetals and narrow- gap semiconductors can be dramatically boosted in the quantum limit. In par ticular\, the thermopower of Dirac/Weyl semimetals increases with the field without saturation and can reach extremely high values. These theoretical results suggest an immediate pathway for achieving record-high thermopower and thermoelectric figure of merit\, and compare well with a recent experim ent on Pb1−xSnxSe.

Hosted by: Brian Swingle LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160615T150000Z DTEND:20160615T160000Z DTSTAMP:20260828T094430Z UID:3ds5ev4n4edl79uut2imfi6qv8@google.com CLASS:PUBLIC CREATED:20160613T143420Z DESCRIPTION:Dr. Brendan McLaughlin from Queens University of Belfast \n\nQu antum Chemistry and its role in photo dissociation and radiative loss proce sses\n\n\nThe structure and properties of molecules and their cations plays a fundamental role\nin a range of dynamical studies such as\; ultra-cold c ollisions\, dissociative electron\nattachment\, radiative loss and associat ion\, photo-dissociation\, electron scattering\,\nphoto-ionization and ultr afast dynamics [1 – 7]. Recent experiments at light sources\nsuch as the Ad vanced Light Source (ALS) in Berkeley\, USA\, SOLEIL in Saint Aubin\,\nFran ce and PETRA III\, in Hamburg\, Germany\, have investigated core excited st ates of\nmolecular system and their subsequent decay [7]. The interpretatio n of experimental\nresults requires detailed information on the structure\, properties and dynamics and is\na prime example where quantum chemistry pl ays a fundamental role.\nElectron- density distributions and potential-ener gy surfaces are important for predicting the physical properties and chemic al reactivity of molecular systems. Angle-resolved\nphoto-electron spectros copy enables the reconstruction of molecular-orbital\ndensities of species [8\,9]. A brief review of the methods used to obtain the structure\nand dyn amics of molecular systems will be given and shown how this information can \nbe used to study a variety of molecular processes in systems such as\; SH +\,SiH+\,NaCa+\, SiO\, CS\, N2 and BaH. LAST-MODIFIED:20160613T143420Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171010T171500Z DTEND:20171010T181500Z DTSTAMP:20260828T094430Z UID:03blbo7coll66cch6nc896e57p@google.com CREATED:20170912T134248Z DESCRIPTION:Speaker: Dr. Purushottam Dixit\, Columbia University\n\nTitle: Metastability Transition in Genome Evolution and Population Structure of Ba cterial Species\n\nAbstract: Multiple evolutionary forces such as point mut ation\, horizontal gene transfer (HGT)\, adaptation\, and ecological niche separation simultaneously shape genomic diversity within bacterial species. Of these\, the interaction between point mutations and HGT is of particula r interest as it pertains to a fundamental question: what are bacterial spe cies? On the one hand\, binary cell division and vertical inheritance (moth er to daughter) of point mutations imposes a clonal population structure. O n the other hand\, transfer of small genetic fragments between related bact eria corrupts the phylogenetic tree. Whether bacteria can retain clonal phy logeny in the presence of HGT currently remains unknown. \n\nUsing a theore tical model\, we identify two qualitatively distinct modes of bacterial evo lution. In the divergent mode the cohesion due to recombination is not suff icient to overcome vertical inheritance of mutations. As a consequence dive rgence between genomes increases linearly with time. At the population leve l\, transient clusters of sexually isolated sub-populations are continuousl y formed and dissolved. The species as a whole retains a clonal population structure. In contrast\, in the metastable mode\, recombination has the upp er hand. Here\, genomes remain closely related to each other for very long periods of time before eventually escaping the pull of recombination (hence the name metastable). The population remains genetically cohesive and stab le over time. Analysis of real bacteria shows that bacterial species belong to both these modes. Generalizations and future directions are discussed. \n LAST-MODIFIED:20171003T141649Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161116T210000Z DTEND:20161116T220000Z DTSTAMP:20260828T094430Z UID:7nvo3jgqsq4iuhf7rqedleot9o@google.com CREATED:20161108T154122Z DESCRIPTION:Speaker Name: Prof. Nuno Loureiro\n\nSpeaker Institution : MIT\ n\nTitle : Magnetic reconnection onset via disruption of a forming current sheet by the tearing instability\n\nAbstract : The recent realization that Sweet-Parker current sheets are violently unstable to the secondary tearing (plasmoid) instability implies that such current sheets cannot occur in re al systems. This suggests that\, in order to understand the onset of magnet ic reconnection\, one needs to consider the growth of the tearing instabili ty in a current layer as it is being formed. We present such an analysis in the context of nonlinear resistive magnetohydrodynamics for a generic time -dependent equilibrium representing a gradually forming current sheet. It i s shown that two onset regimes\, single-island and multi-island\, are possi ble\, depending on the rate of current sheet formation. A simple model is u sed to compute the criterion for transition between these two regimes\, as well as the reconnection onset time and the current sheet parameters at tha t moment. For typical solar corona parameters\, this model yields results c onsistent with observations. LAST-MODIFIED:20161108T154225Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180212T213000Z DTEND:20180212T223000Z DTSTAMP:20260828T094430Z UID:7s63ib3nn88mu25o98n78nbudn@google.com CREATED:20180201T170048Z DESCRIPTION:\nSpeaker Name: Demos Kazanas\n\nSpeaker Institution: NASA God dard Space Flight Center\n\nTitle: MHD Accretion Disk Winds as X-Ray Absor bers Across the Black Hole Mass Scale\n\nAbstract: Black hole accretion di sks appear to produce invariably plasma outflows that result in blue-shifte d absorption features in their X-ray and UV spectra. The X-ray absorption-l ine properties of these outflows are quite diverse\, ranging in velocity fr om non-relativistic (∼300 km/sec) to sub-relativistic (∼0.1c where c is the speed of light) and a similarly broad range in the ionization states of th e wind plasma. It will be shown that semi-analytic\, self-similar magnetohy drodynamic (MHD) wind models can successfully account for the X-ray absorbe r properties of supermassive black holes and also that the same models fit well the high-resolution X-ray spectrum of the accreting stellar-mass black hole\, GRO J1655-40. This provides an explicit theoretical argument of the ir MHD origin (aligned with earlier observational claims) and supports the notion of a universal magnetic structure of the observed winds across all k nown black hole sizes. Most importantly\, these results indicate that the m ass flux of these winds increases with radius\, a fact that bears on the gl obal structure of Active Galactic Nuclei (AGN) and Galactic X-Ray Sources ( XRB).\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20180201T194512Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171114T160000Z DTEND:20171114T170000Z DTSTAMP:20260828T094430Z UID:5af135dt77v1g0lhc6vfgfa9vp@google.com CREATED:20171107T174721Z DESCRIPTION:Speaker: Naoto Nakano\nKyoto University\n\nTitle: Sturm-Liouvil le Framework for Dynamical Reconstruction by Delay Embedding\nAbstract: Del ay embedding is well-known for non-linear time-series analysis\, and it is used in several research fields such as physics\, informatics\, neuroscienc e and so on. The celebrated theorem of Takens ensures validity of the delay embedding analysis: embedded data preserves topological properties\, which the original dynamics possesses\, if one embeds into some phase space with sufficiently high dimension. This means that\, for example\, an attractor can be reconstructed by the delay coordinate system topologically. However\ , configuration of an embedded dataset may easily vary with the delay width and the delay dimension\, namely\, ``the way of embedding". In a practical sense\, this sensitivity may cause degradation of reliability of the metho d\, therefore it is natural to require robustness of the result obtained by the embedding method in certain sense. In this study\, we investigate the mathematical structure of the framework of delay-embedding analysis to prov ide Ansatz to choose the appropriate way of embedding\, in order to utilize for time-series prediction. In short\, mathematical theories of the Hilber t-Schmidt integral operator and the corresponding Sturm-Liouville eigenvalu e problem underlie the framework. Using these mathematical theories\, one c an derive error estimates of mode decomposition obtained by the present met hod and can obtain the phase-space reconstruction by using the leading mode s of the decomposition. In this talk\, we will show some results for some n umerical and experimental datasets to validate the present method. LAST-MODIFIED:20171107T174721Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180523T170000Z DTEND:20180523T183000Z DTSTAMP:20260828T094430Z UID:48odd0f80c3n2jflfalgjva627@google.com CREATED:20180502T150135Z DESCRIPTION:\n\nSpeaker: Hank Lamm\n \nSpeaker Institution: University of M aryland\n \nTitle: Model-Independent Constraints on R(J/Psi)\n\nAbstract: L HCb has recently presented a measurement of R(J/Psi)=0.71(17)(18) in mild t ension with the range of model predictions 0.25-0.28. The model transition form factors dominate the systematic uncertainty of the measurement and lim it the predictions to a range of values. To improve this situation\, we hav e undertaken to compute model-independent constraints on the transitions fo rm factors via dispersive methods and lattice data. This allow for rigoro us upper and lower bounds on R(J/Psi) to be computed in the Standard Model. LAST-MODIFIED:20180516T142014Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171012T123000 DTEND;TZID=America/New_York:20171012T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20171012T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nDerek Richardson\nUniversity of Maryland | Department of Astronomy\nTitle: Granular Dynamics in Low Gravity\nAbstract: Small sol ar system bodies are generally covered in layers of particulate "regolith" with largely unknown properties. The effective gravities on these bodies c an sometimes tend to zero at the equator\, and have been measured to be neg ative in a few cases. Space agencies and commercial enterprises show incre asing interest in visiting\, landing on\, and sampling from such bodies\, s o it is important to understand how the regolith will respond to intrusion. Due to the difficulty and expense of carrying out experiments in low grav ity\, we turn to computer simulations of granular dynamics to provide insig ht into the conditions that missions to other worlds may encounter and to h elp interpret observations of these bodies. As high-end computing resources become more readily available\, granular dynamics simulations have become more sophisticated\, treating particle collisions as finite-duration\, mult i-contact events with explicit friction forces between irregularly shaped g rains subject to external forces\, boundary conditions\, and cohesion. It is imperative that such simulation methods be calibrated and validated at l aboratory scales to give confidence in their application to other environme nts. Here I review our group's approach to simulating granular dynamics in low gravity\, with examples that include impacts into granular materials\, vibration-induced segregation\, landslides\, models of samplers and lander s\, and\, on larger scales\, simulations of entire granular bodies (rubble piles) and planetary rings. LAST-MODIFIED:20170911T175839Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180403T180000Z DTEND:20180403T190000Z DTSTAMP:20260828T094430Z UID:4phbvmjlcs8276k6btua4al7sk@google.com CREATED:20180329T184736Z DESCRIPTION:
Chr is Baldwin\, Boston University


A new b reakdown of eigenstate thermalization\, and the implications for quantum co mputing

We describe a novel dynamical phase in which thermaliza tion breaks down even on the level of the many-body eigenstates. This “trap ped” phase is found in spin glass models of particular relevance for quantu m computing applications. After briefly discussing the use of eigenstates & amp\; eigenstate phases to understand isolated many-body quantum systems\, we contrast this trapped phase to the better-known many-body localized (MBL ) phase. Whereas MBL arises from the detuning of energy levels\, the trappe d phase arises from macroscopic energy barriers which suppress tunneling am plitudes to below the scale of the level spacing. We calculate the trapped- thermal phase boundary in a family of tractable toy models. We then discuss the relevance for using quantum fluctuations to solve “matching” problems\ , a type of hard computational task which might be amenable to adiabatic qu antum computation. LAST-MODIFIED:20180330T203605Z LOCATION:Atlantic 3100A SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180918T171500Z DTEND:20180918T181500Z DTSTAMP:20260828T094430Z UID:52pd7idujlnsftuq7sak8uo5uk@google.com CREATED:20180905T131458Z DESCRIPTION:Speaker: Robert Best\, National Institutes of Health

Title: Molecular Simulation Tools for Investigating Structure \, Dynamics and Phase ?Transitions of Intrinsically Disordered Proteins

Abstract: Intrinsically disordered proteins (IDPs) are incre asingly realized to play a wide range of functional as well as pathological roles in biology. However\, biophysical characterization of these proteins is experimentally challenging due to the extremely heterogeneous ensemble of structures which they populate. Computational tools\, in particular mole cular simulations\, can therefore play a role in elucidating structure\, fu nction and dynamics in IDPs. Here\, I will show how both detailed atomistic simulations\, as well as simplified coarse-grained models can be used to a ssist in the interpretation of experiments on IDPs. In particular\, I will describe recent work characterizing an ultra-high affinity complex between two charged IDPs which\, remarkably\, remain completely disordered upon bin ding. LAST-MODIFIED:20180912T184108Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180216T210000Z DTEND:20180216T214000Z DTSTAMP:20260828T094430Z UID:1ftv0muie7tueff8a2uggjtbdc@google.com CREATED:20180214T161026Z DESCRIPTION:Speaker Name: Wade DeGottardi\n\nSpeaker Institution: JQI and I REAP\n\nTitle: Bulk viscosity of one-dimensional electron liquids\n\nAbstra ct: Theoretical studies of strongly interacting many-body systems in one di mension have tended to focus on integrable models. However\, such models ca nnot account for dissipative processes which control many experimentally re levant quantities. In this talk\, I will discuss recent work extending Lutt inger liquid theory to account for the finite lifetime of excitations. I wi ll focus on the microscopic origin of the bulk viscosity and explore ways i n which this quantity can be measured in quantum wires and cold atomic gase s.\n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180214T161513Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170330T163000Z DTEND:20170330T173000Z DTSTAMP:20260828T094430Z UID:a5uagvnl2fluuj22004b30ql5k@google.com CREATED:20170327T183944Z DESCRIPTION:PHYS 798E and ENEE 698D\n*Speaker: Ted Jones\, Naval Research L aboratory\, Plasma Physics Div.*\n\n*Abstract:* Intense underwater laser pr opagation\, filamentation\, and\nionization are being investigated at NRL f or many Navy applications\,\nincluding remote undersea laser acoustic gener ation for low-frequency\nlong-range sonar\, and advanced micromachining. Th e key to low-frequency\nlaser acoustic generation is the shaping of the hea ted underwater volume\,\nwhere more elongated volumes produce longer-durati on acoustic pulses with\nmore energy at low-frequencies.\n\nA patented sche me for generating elongated\, meter-scale\,\nhigh-energy-density underwater plasmas [USP 9\,088\,123] is under study\, in\nwhich optically active elec trons associated with an “igniter” laser\nfilament could serve as a target for a second energetic “heater” laser\npulse. Previous NRL experiments rev ealed 100 µm diameter filament-like\nstructures generated by ns pulses1. S eparate NRL time-resolved absorption\nspectroscopy measurements\, during in tense underwater propagation of 400 nm\,\n170 ps laser pulses\, revealed hy drated electron densities up to 5.4 x 1018\ncm-3 with a lifetime of 350 ps. Together\, these results suggest improved\nionization efficiency using a 100 ps UV (266 or 355 nm) igniter pulse. An\nenergetic 532 nm\, 10 ns puls e could then serve as the heater pulse. Analytical\nand 2-D numerical mode ling is underway to understand and predict beam\npropagation and filamentat ion in the presence of strong stimulated Raman\nscattering (SRS) and therma l lensing2\,3. Results from recent experiments\nand simulations will be di scussed.\n\n________________________________\n\n*This work is supported by NRL 6.1 Base Funds and direct ONR 6.2 Funds.\n\n1M. Helle\, et al\, “Format ion and Propagation of Meter-Scale Laser Filaments\nin Water\,”Appl. Phys. Lett. *103*\, 121101 (2012).\n\n2B. Hafizi\, et al.\, “Stimulated Raman Sca ttering and Nonlinear Focusing of\nHigh-Power Laser Beams Propagating in Wa ter\,” Opt. Lett. *40*\, 1556 (2015).\n\n3B. Hafizi\, et al.\, “Stimulated Raman & Brillouin Scattering\, Nonlinear\nFocusing\, Thermal Blooming\, & O ptical Breakdown of a Laser Beam Propagating\nin Water\,” JOSA B *33*\, 206 2 (2016). pending.\n\n\n*Bio:* Dr. Jones presently leads research as PI on intense underwater\nlaser propagation and interactions for many Navy appli cations\, including\nunderwater laser acoustic generation for sonar search\ , communications\, and\nnavigation. Dr. Jones’ research interests also incl ude nonlinear optics\,\nlaser particle acceleration\, and magnetic fusion. He has worked in the NRL\nPlasma Physics Division since receiving his Ph.D . in plasma physics from\nPrinceton University in 1995.\n LAST-MODIFIED:20170327T183944Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171002T150000Z DTEND:20171002T153000Z DTSTAMP:20260828T094430Z UID:29tk4ietgp8gimpcfmvi7rjhqi@google.com CLASS:PUBLIC CREATED:20170921T115504Z DESCRIPTION:Xiao Li\, JQI \n\nTitle: Observation of mobility edges in a one -dimensional bichromatic incommensurate potential\n\nAbstract: In this talk I will focus on a one-dimensional (1D) mutually incommensurate bichromatic lattice system which has been implemented in ultracold atoms to study quan tum localization. It has been universally believed that the tight-binding v ersion of this bichromatic incommensurate system is represented by the well -known Aubry-Andre model [1]. Here we establish that this belief is incorre ct and that the Aubry-Andre model description\, which applies only in the e xtreme tight-binding limit of very deep primary lattice potential\, generic ally breaks down near the localization transition due to the unavoidable ap pearance of single-particle mobility edges (SPME) [2]. As a result\, for th e full lattice system\, an intermediate phase between completely localized and completely delocalized regions appears due to the existence of the SPME \, making the system qualitatively distinct from the Aubry-Andre prediction . Our theoretical prediction is subsequently verified in an experiment usin g a one-dimensional quasi-periodic optical lattice [3]. In particular\, a r egime is identified where extended and localized single-particle states coe xist\, in good agreement with our theoretical results. Our work thus presen ts the first realization of a system with a SPME in one dimension\, and it opens up more research prospects in the context of manybody localization\, including the question of manybody mobility edges. \n\nReferences: \n\n[1] S. Aubry and G. Andre\, Ann. Israel. Phys. Soc. 3\, 133 (1980). \n[2] Xiao Li\, Xiao-Peng Li\, and S. Das Sarma\, Phys. Rev. B 96\, 085119 (2017). \n[ 3] H. P. Luschen\, S. Scherg\, T. Kohlert\, M. Schreiber\, P. Bordia\, Xiao Li\, S. Das Sarma\, and I. Bloch\, arXiv:1709.03478.\n LAST-MODIFIED:20170921T115504Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170501T203000Z DTEND:20170501T213000Z DTSTAMP:20260828T094430Z UID:uensq0kknrqrj1egk3oea6crko@google.com CREATED:20170412T211024Z DESCRIPTION:Speaker Name: Thomas Mernik\n\nSpeaker Institution : University of Maryland\n\nTitle : Observing Ultra-high Energy Cosmic Rays from Space with the JEM-EUSO Telescope\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\n\ nAbstract : Cosmic rays are predominantly charged particles\, among them pr otons\, atomic nuclei\, neutrinos and antimatter\, arriving to the earth fr om all directions of the sky. Their energies reach from about 10^10 eV up t o more than 10^20 eV. The origin of ultra-high energy cosmic rays (UHECR) w ith energies exceeding 10^18eV still remains a mystery. At this end of the cosmic ray spectrum the number of measured events drops to one event per km 2 in 100 years - severely limiting our options to do research in this energ y range. A space borne UHECR telescope would provide an unprecedented apert ure and an all sky coverage. The JEM-EUSO Collaboration (Extreme Universe O bservatory onboard the Japanese Experiment Module) is developing a space mi ssion for the detection of UHECR. After deployment to the International Spa ce Station it will monitor the atmosphere for UHECR induced air showers in the UV range. Utilizing the fluorescence technique it can observe cosmic ra y events with energies exceeding 3x10^19 eV. A JEM-EUSO type apparatus will be the key experiment to address one of the most exciting questions in ast rophysics - the origin of UHECR. In the scope of this talk we will discuss obstacles and advantages of the space approach on the example of instrument performance simulation studies of the JEM-EUSO telescope. LAST-MODIFIED:20170412T211155Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171013T190000Z DTEND:20171013T200000Z DTSTAMP:20260828T094430Z UID:6s1h1l2s7ddt55h68iasmar7go@google.com CREATED:20170925T215202Z DESCRIPTION:Speaker:\nShmuel Fishman\nTechnion | Department of Physics\nTit le: Statistical Description of Mixed Systems (Chaotic and Regular)\, Correl ations and "Thermalization"\nAbstract: We discuss a statistical theory for Hamiltonian dynamics with a mixed phase space\, where in some parts of phas e space the dynamics is chaotic while in other parts it is regular. Transpo rt in phase space is dominated by sticking to complicated structures and it s distribution is universal. The survival probability in the vicinity of th e initial point is a power law in time with a universal exponent. We calcul ate this exponent in the framework of the Markov Tree model proposed by Mei ss and Ott in 1986. It turns out that\, inspite of many approximations\, it predicts important results quantitatively. The calculations are extended t o the quantum regime where correlation functions and observables are studie d. The seminar will be very informal and some work still in progress will b e reported. The work reported is in collaboration with Or Alus\, James Meis s and Mark Srednicki. LAST-MODIFIED:20170926T024437Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180912T193000Z DTEND:20180912T203000Z DTSTAMP:20260828T094430Z UID:2p0upofqpi1jb6ehvgrijtid0s@google.com CREATED:20180831T171108Z DESCRIPTION:Title: Nonlinear Transformation from Convective to Absolute St imulated Raman Backscattering Instability and Inflation of Laser Reflectivi ty in Laser Fusion Experiment \n\nSpeaker Name: C. S. Liu\, University of M aryland LAST-MODIFIED:20180905T193855Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160419T171500Z DTEND:20160419T181500Z DTSTAMP:20260828T094430Z UID:nuqum9t5cbgqcgmun04hjdhpf8@google.com CREATED:20160331T155438Z DESCRIPTION:Speaker Name: Eitan Tadmor\n\nSpeaker Institution: University o f Maryland\, College Park\n\nTitle: Collective dynamics: from emergence of consensus to social hydrodynamics\n\nAbstract : We discuss the collective d ynamics of systems driven by "social engagement" of agents with their local neighbors. Prototypical examples which involve environmental averaging inc lude alignment-based models in opinion dynamics\, flocking\, self-organizat ion of biological organisms\, and rendezvous in mobile networks.\n\nWe addr ess two natural questions which arise in this context. First\, how differen t rules of engagement influence the formation of large time\, large scale p atterns such as clusters\, and in particular\, the emergence of "consensus" . We propose an alternative paradigm based on the tendency of agents "to mo ve ahead" which leads to the emergence of leaders. Second\, the group behav ior of systems which involve a large number of agents lend themselves to ki netic and hydrodynamic descriptions. It is known that if smooth solutions o f "social hydrodynamics" exist\, then they must flock. Do such smooth solut ions exist? alignment-based models reflect the competition on resources\, a nd left unchecked\, may lead to finite-time singularities. We discuss the g lobal regularity of social hydrodynamics for sub-critical initial configura tions. LAST-MODIFIED:20160408T182529Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160505T180000Z DTEND:20160505T193000Z DTSTAMP:20260828T094430Z UID:o77euog4sjjcuusnq2hn0vsr08@google.com CREATED:20160108T164359Z DESCRIPTION:Speaker Name: Alex Levchenko\n\nSpeaker Institution: Wisconsin- Madison\n\nTitle: Anomalous Hall and Kerr effects from diffractive skew sca ttering: examples of Kondo TIs and p-wave superconductors\n\nAbstract: I wi ll discuss new mechanism of the anomalous quantum transport originating fro m the diffractive skew scattering of electrons on the rare two-impurity com plexes. As practical examples we will consider extrinsic contribution to th e anomalous Hall effect in the context of surface states of Kondo topologic al insulators and contributions to the Kerr effect in the context of the ch iral p-wave superconductors.\n\nHOST: Vlad Manucharyan\n LAST-MODIFIED:20160429T183822Z LOCATION:Room 1201 John S Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Alex Levchenko\, Wisconsin-Madison TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180917T110000 DTEND;TZID=America/New_York:20180917T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44@google.com RECURRENCE-ID;TZID=America/New_York:20180917T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Advanced Quantum Communication — Where do we go from her e?\n\n\nSpeaker: Paul Kwiat\, Affiliation: U. of Illinois at Urbana-Champai gn\n\nAbstract: It is now well understood that quantum mechanics can enable otherwise impossible feats in the processing and communicating of informat ion. For example\, quantum cryptography enables provably secure encryption\ , even as the looming reality of quantum computers threatens our existing m ethods of encryption. To help bridge the gap to an eventual global multi-n ode quantum network\, we are pursuing airborne and satellite-based free-spa ce quantum communication. Free-space platforms may be easily moved/reorient ed to target new nodes\, and an agile\, reconfigurable system -- we are imp lementing a multi-copter drone-based system -- could enable quantum crypto graphy in applications prohibited by current approaches\, such as temporary networks in seaborne\, urban\, or even battlefield situations. At longer s cale\, we are pursuing a quantum link from the International Space Station to earth\, which will use hyperentanglement to enable several advanced quan tum communication protocols\, including multi-bit-per-photon key distributi on and “superdense” teleportation. LAST-MODIFIED:20180910T175438Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160912T190000Z DTEND:20160912T200000Z DTSTAMP:20260828T094430Z UID:htddodlbmmd6obs8k2hnmoufm0@google.com CREATED:20160909T182714Z DESCRIPTION:Message from ​Kara​ Hoffman (kara@umd.edu)​\n*****************\ nAs you may know\, the university is gradually rolling out a number of new classrooms to support more interactive instruction. Ten of these "T.E.R.P. " classrooms already exist\, and many more will become available when the S t. John Teaching and Learning Center opens its doors in the Fall of 2017.\n \nDo you find yourself wondering how such a classroom\, or interactive inst ructional techniques in general\, might be used in a physical science cours e? Me too.\n\nIn the spirit of interactive learning\, we are hosting an op en discussion of teaching methods featuring presentations from two of our c olleagues who have successfully integrated interactive instruction in their classroom. (Preview below.) Please join us Monday Sept. 12 at 3:00pm in PSC2136.\nCookies\, tea\, and coffee will be served.\n\n\nDerek Richardson \, Astronomy\nI will talk about the transformation we made of ASTR120/121\, the introductory astrophysics sequence for majors. This was funded by an Elevate grant from the Teaching and Learning Transformation Center (TLTC) l ast academic year. We made a lot of changes\, the most significant being t he consistent use of lecture learning goals to guide content and assessment \, think-pair-share questions during lecture to direct where to spend time\ , and group exercises to foster collaboration in learning. \n\nPeter Shawha n\, Physics\nMy teaching style has evolved in a number of ways over the pas t several years to try to engage students more consistently in my lectures. For one thing\, I aim to "teach around the text"\, sharing interpretation s and applications rather than repeating the concept statements and example s that they can read about in the textbook. I use my tablet PC to deliver partly filled-in slides and then hand-write points of emphasis and work out examples in real time\, facing the students. I have been using Learning C atalytics\, an alternative to standard clickers\, which gives a better real -time view of student responses and can do a number of things that standard clickers can't.\n\n LAST-MODIFIED:20160909T183552Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Interactive Teaching Forum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180410T160000 DTEND;TZID=America/New_York:20180410T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180410T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: David Schwartz\n\nSpeaker Institution: Author\n\n Title: How Fermi Became Fermi\n\nAbstract: Enrico Fermi was one of the mo st significant figures of 20th century physics\, with major contributions a cross a wide range of subdisciplines. Fermi revolutionized 20th-century phy sics with his theory of beta decay and his development of quantum statistic s.\nDavid N. Schwartz\, the author of the recently published biography of F ermi\, “The Last Man Who Knew Everything\,” will discuss the development of Fermi as a physicist\; the role of nature\, nurture and historical circums tance in his career\; and the characteristics behind both his strengths and his weaknesses. Are great physicists born\, do they make themselves\, or d o others make them? How does the accident of one’s birth influence a career like Fermi’s? What was it that enabled Fermi to continue to contribute to the field well beyond the age when many great physicists are content to res t on their previous achievements?\nDavid N. Schwartz holds a Ph.D. in polit ical science from MIT and is the author of two previous books. He has worke d at the State Department Bureau of Political-Military Affairs\, the Brooki ngs Institution and Goldman Sachs. He is the son of Melvin Schwartz\, who s hared the 1988 Nobel Prize in physics for the discovery of the muon neutrin o in 1962.\nHosted by: Nick Hadley LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180314T150000Z DTEND:20180314T160000Z DTSTAMP:20260828T094430Z UID:1258adbjamhdalv8qb4brs50q3@google.com CREATED:20180306T142751Z DESCRIPTION:Speaker: Tara Michael\, (Student seminar)\, UMCP
< br>
Title: Probing Quantum Scattering Resonances from Cold Collis ions


Abstract: \; \;At very low temperatures\, appro aching 1 K\, the collision dynamics of interacting particles enters a regim e dominated by quantum mechanics. As the de Broglie wavelength of particles becomes comparable to the interaction length between them\, the possibilit y of tunneling through potential energy barriers becomes a possibility. As a consequence\, short lived quasi-bound complexes may form between collisio n partners at particular collision energies\, giving rise to resonance feat ures in measured integral cross sections as a result of enhanced inelastic scattering from this complex. LAST-MODIFIED:20180306T142751Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T140000Z DTEND:20180316T193000Z DTSTAMP:20260828T094430Z UID:1agup8jnbm9femrnpn0bl0h9mu@google.com CREATED:20180222T125822Z DESCRIPTION:

Schedule:

10:00-10:45 \; \;Victor Ya kovenko\, \;Loop currents from nonunitary chiral superconductivity o n the honeycomb lattice

 \;

10:45-11:3 0 \; \;Yunxiang Liao\, \;Dephasing Catastrophe in 4- \;ε \;Dimensions

 \;

11:30-12:15 \; \;Donovan Buterakos\,  \;Dynamical Crosstalk Correction in Coupled Singlet-Triplet Qubit System s

 \;

12:30-2pm&n bsp\; \;BREAK

 \;

2:00-2:45&nbs p\; \;Ali Lavasani\, \;Low overhead Clifford gates from joint me asurements

 \;

2:45-3:30  \; \;Yingyi Huang\, \;Disorder-induced half-integer quantiz ed conductance plateau in quantum anomalous Hall insulator-superconductor s tructures

 \;



 LAST-MODIFIED:20180313T185342Z LOCATION:CMTC Conference Room (2205 John S. Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Spring Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160919T170000Z DTEND:20160919T180000Z DTSTAMP:20260828T094430Z UID:p0pmie47b5g3otqomt2jnmgnd4@google.com CREATED:20160906T135535Z DESCRIPTION:Speaker: Sepehr Nezami\n\nSpeaker Affiliation: Stanford Institu te for Theoretical Physics\n\nTitle: Random tensor networks and holographic entanglement \n\nAbstract: Tensor networks provide a natural framework for exploring holographic dualities because their entanglement entropies autom atically obey an area law. We study the holographic properties of networks of random tensors. We review several interesting structural features of the AdS/CFT correspondence and derive them in our model. Entropies of random tensor networks satisfy the Ryu-Takayanagi formula for all boundary regions \, including corrections due to bulk entanglement. Our method is to interpr et random tensor averages as the partition functions of classical ferromagn etic Ising models\, so that the minimal surfaces of the Ryu-Takayanagi form ula appear as domain walls. Increasing the entanglement of the bulk ultimat ely creates the analog of a black hole. The bulk-boundary correspondence de fined by a random tensor network satisfies an appropriate quantum error cor rection property known as entanglement wedge reconstruction. We further st udy the multipartite entanglement structure of random stabilizer tensor net works and conclude by some remarks about the properties of entanglement ent ropy in holographic states.\n\nReferences: \n1. Holographic Duality From Ra ndom Tensor Networks arXiv:1601.01694\n2. Multipartite Entanglement in Stab ilizer Tensor Networks arXiv:1608.02595\n LAST-MODIFIED:20160906T135535Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180403T160000 DTEND;TZID=America/New_York:20180403T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180403T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Chan Joshi\n\nSpeaker Institution: UCLA\n\nTitle: Latest Results on Plasma Wakefield Acceleration\n\nAbstract: A dense\, ult ra-relativistic electron bunch propagating through a uniform plasma can pro duce a highly nonlinear wake that can be employed for accelerating a second \, trailing bunch in a scheme known as the Plasma Wakefield Accelerator (PW FA). Recent work has shown that a PWFA cavity can accelerate a low energy s pread electron bunch containing a significant charge at both high gradients and high energy-extraction efficiency - necessary conditions for making fu ture particle accelerators both compact and less expensive. In addition to this\, the next important issues that must be addressed are the generation\ , acceleration and extraction of ultra-low emittance bunches from plasma ac celerators. Such bunches are ultimately essential to obtaining extremely br ight beams for future light sources and high-luminosities for future partic le colliders. A new facility\, FACET II is being constructed at SLAC that w ill enable the demonstration of a single electron stage of a future multi-s tage plasma wakefield collider. I will describe the plans and the progress for the upcoming experimental campaign on FACET II.\nHosted by: Howard Milc hberg LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160503T170000Z DTEND:20160503T180000Z DTSTAMP:20260828T094430Z UID:bg34fad5c9bse49j2tbolktqmo@google.com CLASS:PUBLIC CREATED:20160427T124025Z DESCRIPTION:Speaker Name: Sergey Syzranov\n\nSpeaker Institution: Univers ity of Colorado\, Boulder\n\nTitle: Emergent topological excitations in sy stems of ultracold dipolar particles\n \nSystems with Weyl and Dirac quasip articles have been predicted to display a plethora of novel fascinating phe nomena\, such as chiral anomaly\, Fermi arcs on the surfaces\, non-Anderson disorder-driven transitions\, etc. Over the last several years enormous re search efforts have been directed at finding new Weyl (Dirac) semimetals in solid-state systems and ways to realise them in ultracold atomic gases. In this talk\, I will demonstrate that excitations with Weyl dispersion gener ically exist in 3D systems of dipolar particles in the presence of magnetic field. They emerge due to the dipolar-interactions-induced transitions bet ween the J = 0 and J = 1 angular-momentum states of the particles. I will present microscopic calculations of the quasiparticle dispersion for system s of alkaline-earth atoms in optical traps and discuss methods of their exp erimental observation. Also\, I will discuss excitations in 2D systems of d ipolar particles and demonstrate the existence of long-wave excitations (ch irons) with the dispersion of bilayer graphene in such systems. LAST-MODIFIED:20160428T184515Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI special seminar - Emergent topological excitations in systems of ultracold dipolar particles TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180222T150000Z DTEND:20180222T160000Z DTSTAMP:20260828T094430Z UID:1lp8uddt9akpv9v66hgvtulin2@google.com CREATED:20180220T181924Z DESCRIPTION:Speaker: Elizabeth Crosson\n\nAffiliation: Caltech\n\nTitle: In trinsic sign problems and ground state sampling complexity\n\nAbstract: The equilibrium states of quantum systems without a sign problem can in many c ases be efficiently sampled using classical Markov chain Monte Carlo algori thms. These classical algorithms challenge the possibility of obtaining q uantum speedups using transverse-field quantum annealing\, and this has mot ivated efforts to design next-generation quantum annealing architectures wi th a sign problem that cannot be removed by any change of the local basis. In this talk I'll explain how to detect and certify the presence of such i ntrinsic sign problems\, which can be used to generate ground state probabi lity distributions that defy efficient classical simulations. LAST-MODIFIED:20180220T181924Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171023T203000Z DTEND:20171023T213000Z DTSTAMP:20260828T094430Z UID:4hrshsh81sipolotogld4pkkko@google.com CREATED:20171018T211210Z DESCRIPTION:Title : The latest gravitational-wave discovery from LIGO and V irgo\nSpeaker Name: Peter Shawhan\nSpeaker Institution : University of Mary land\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : The 2015 detect ion of gravitational waves by the Advanced LIGO detectors was a long-awaite d milestone. Besides confirming a prediction of Einstein's general theory o f relativity (GR)\, the discovery revealed a new and largely unexpected cla ss of astronomical systems -- heavy black hole binaries -- and also enabled detailed tests of GR. Additional detections have followed from the rest of the first Advanced LIGO observing run plus the second observing run\, in 2 016-17. In August 2017\, the Advanced Virgo detector in Italy joined LIGO f or the last month of the observing run. In September\, the LIGO and Virgo t eams announced the fourth high-confidence binary black hole merger detectio n\, which was especially notable since the Virgo data allowed the sky posit ion of the source to be localized much better than previous events. And jus t this past week\, LIGO and Virgo announced the long-awaited detection of a binary neutron star inspiral and merger\, which was followed in spectacula r fashion by a short gamma-ray burst and kilonova/afterglow emissions acros s the whole electromagnetic spectrum. I will discuss the latest gravitatio nal-wave detection and its implications for astrophysics and fundamental ph ysics. LAST-MODIFIED:20171019T002505Z LOCATION:Atlantic Building Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180511T130000Z DTEND:20180511T210000Z DTSTAMP:20260828T094430Z UID:7btt5ci1fkh4henfqsdjovpidd@google.com CREATED:20180427T142107Z DESCRIPTION:
Refreshments and lunch will be provided for all registered participants. Please register here. \;
Title : Protein Folding: Biophysics\, Biology\, & \; Beyond

Karen Fleming\, Biophysics Department at Johns Hopkins Un iversity

Dave Thirumalai\, Department of Chemistry at University of Texas Austin

William Eaton\, Laboratory of Chemical Physics at NIDDK \, NIH

Dorothy Beckett\, Department of Chemistry &\; Biochemistry at UMD

Victor Munoz\, Bioengineering Department at University of C alifornia Merced

Amnon Horovitz\, Department of Structural Biology a t Weizmann Institute of Science\, Israel

G. Marius Clore\, Laborator y of Chemical Physics at NIDDK\, NIH

George Lorimer\, Department of Chemistry &\; Biochemistry at UMD LAST-MODIFIED:20180504T195804Z LOCATION:Marker Seminar Room (0112)\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170302T203000Z DTEND:20170302T220000Z DTSTAMP:20260828T094430Z UID:jd6hf5a8i0pl0k3p892nb0jm24@google.com CREATED:20170224T211746Z DESCRIPTION:Speaker: Eric Lownes (UMCP) - \n LAST-MODIFIED:20170224T211746Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to Derived Categories TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170502T171500Z DTEND:20170502T181500Z DTSTAMP:20260828T094430Z UID:fg9q2uf00hjvgf6m03vcair8o8@google.com CREATED:20170124T152055Z DESCRIPTION:Speaker Name: Dr. David Ross\n\nSpeaker Institution: NIST\n\nTi tle: Equilibrium Free Energies from Non-Equilibrium Trajectories with Relax ation Fluctuation Spectroscopy\n\nAbstract: Recent advances in non-equilibr ium statistical mechanics and single-molecule measurements have enabled the determination of equilibrium free energies from non-equilibrium work measu rements for fluctuating systems ranging from biological molecules to quantu m oscillators. However\, for many important non-equilibrium processes\, it is difficult or impossible to apply and measure the work required to drive the system through the relevant conformational changes. In this seminar\, I will describe our work to derive and demonstrate a method for the determin ation of equilibrium free energies\, without application or measurement of work. The method\, relaxation fluctuation spectroscopy (ReFlucS) works by a nalyzing the stochastic trajectories of single biomolecules or other nanosc ale\, fluctuating systems as they spontaneously relax from a non-equilibriu m initial state. I will discuss the assumptions required for application of ReFlucS\, and its application to the determination of the free-energy prof ile for DNA molecules in a structured nanofluidic environment. I will also discuss potential extension of the method for determination of energy dissi pation rates for non-equilibrium steady-state processes. LAST-MODIFIED:20170425T191511Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170305T000000Z DTEND:20170305T013000Z DTSTAMP:20260828T094430Z UID:qhi8dj2d13nktmen6snohfosr8@google.com CREATED:20170131T161108Z DESCRIPTION:The Physics of Fantastic Worlds: From Star Wars to Harry Potter \n\nWizards have magic\, but Muggles have science! Join us for an exciting and interactive\nphysics demonstration show.\n\nhttps://umdphysics.umd.edu/ events/aboutus-outreach/physics-is-phun.html#2016-2017-physics-is-phun-prog rams LAST-MODIFIED:20170131T161126Z LOCATION:1410/1412 Toll Physics Building\, UMD SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics is Phun TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160425T200000Z DTEND:20160425T213000Z DTSTAMP:20260828T094430Z UID:0btku6j1h4538rmdndp5ush9n8@google.com CREATED:20160419T133033Z DESCRIPTION:Speaker Name: Matthew Low\n\nSpeaker Institution: IAS\, Princet on\n\nTitle: Unification and New Signals at the LHC\n \nAbstract: The fact that the standard model gauge couplings approximately unify at high energie s has motivated work on many models involving larger gauge groups. Assumin g that unification occurs perturbatively\, there is a restricted set of new fields that can be added without disrupting this behavior. In this talk\, I will use this set of possibilities to motivate interesting signals of ne w physics one can hope to observe at the LHC. LAST-MODIFIED:20160421T185154Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170213T213000Z DTEND:20170213T223000Z DTSTAMP:20260828T094430Z UID:rfqfdpabkvmlb2eboa4vm3gmus@google.com CREATED:20170131T185234Z DESCRIPTION:Speaker Name: Youngsoo Yoon\n\nSpeaker Institution : Institute for Basic Science\, Daejeon\, Korea\n\nTitle : A Search for Neutrinoless Do uble Beta Decay using Mo-100\, AMoRE\n\nAbstract : The AMoRE (Advanced Mo-b ased Rare Process Experiment) is an experimental search for neutrinoless do uble beta decay of 100Mo using calcium molybdate (CaMoO4) scintillating cry stals. The AMoRE uses a cryogenic detection technique using CaMoO4 crystals \, which provide excellent energy resolution (t status of the AMoRE experim ent will be presented. LAST-MODIFIED:20170131T185338Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180330T170000Z DTEND:20180330T180000Z DTSTAMP:20260828T094430Z UID:3cm829l1qbfu50rk9nl4qrhbip@google.com CREATED:20180322T150336Z DESCRIPTION:

Speaker: Colin Heikes\, NRC Postdoc Fello\, NIST Center for Neutron Research

Title: Pressure and Strain Depen dent Control of Structure and Band Topology in the Superconducting Type-ll Weyl Semimetal Candidate MoTe2


< b>Abstract: \;http://mse.u md.edu/events/seminars

LAST-MODIFIED:20180322T150336Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161007T161500Z DTEND:20161007T171500Z DTSTAMP:20260828T094430Z UID:0p4mq5mfi0icbs7gvaq5oprhi4@google.com CREATED:20160928T135641Z DESCRIPTION:Speaker Name: Chiao-Hsuan Wang\n\nSpeaker Institution: UMD/JQI/ QuICS \n\nTitle: A Landauer formulation of photon transport in driven syste ms\n\nAbstract: Understanding the behavior of light in non-equilibrium scen arios underpins much of quantum optics and optical physics. While lasers pr ovide a severe example of a non-equilibrium problem\, recent interests in t he near-equilibrium physics of photon `gases'\, such as in Bose condensatio n of light or in attempts to make photonic quantum simulators\, suggest one reexamine some near-equilibrium cases. Here we consider how a sinusoidal p arametric coupling between two semi-infinite photonic transmission lines le ads to the creation and flow of photons between the two lines. \nOur approa ch provides a photonic analogue to the Landauer transport formula\, and usi ng non-equilbrium Green's functions\, we can extend it to the case of an in teracting region between two photonic `leads' where the sinusoid frequency plays the role of a voltage bias. Crucially\, we identify both the mathemat ical framework and the physical regime in which photonic transport is direc tly analogous to electronic transport\, and regimes in which other new beha vior such as two-mode squeezing can emerge.\n LAST-MODIFIED:20160928T135641Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170510T190000Z DTEND:20170510T200000Z DTSTAMP:20260828T094430Z UID:d4htlkk5qda4hgc89ag9et9vrg@google.com CREATED:20170427T133439Z DESCRIPTION:Speaker Name: Prof. Jacob Adams\n\nSpeaker Institution : North Carolina State University\n\nTitle : Wideband Communication via Narrowband Antennas Using Direct Modulation\n\nAbstract : Well-known physical limits i mpact the performance of electrically small antennas. Most importantly\, an antenna’s available bandwidth decreases cubically with its size relative t o a wavelength (electrical size). Therefore\, small antennas act as undesir able narrowband filters\, passing only low throughput data streams and ofte n requiring multiple antennas to communicate over different bands. While lo wer frequencies have favorable propagation characteristics for long distanc e and non-line-of-sight communication\, their wavelengths tend to be long\, on the order of tens or hundreds of meters\, precluding the use of physica lly compact transmit antennas.\n\nThese theoretical limits assume the anten na is a linear time-invariant (LTI) system\, which is a reasonable assumpti on for conventional antennas. However\, new direct antenna modulation (DAM) schemes\, in which an active antenna or its matching network are modulated synchronously with the transmitted symbols\, transform the antenna into a time-variant system with the potential to circumvent these physical bounds. Early studies in this area have observed compelling effects in both the fr equency and time domains\, but have not yet demonstrated that directly modu lated signals contain information that can be accurately demodulated at the receiver or have a measurable impact on communications. We will discuss ou r ongoing work in both modeling and characterizing variations of DAM for se veral modulation schemes and quantitatively compare their performance to sy stems constrained by the conventional LTI bounds. LAST-MODIFIED:20170427T133634Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170419T180000Z DTEND:20170419T200000Z DTSTAMP:20260828T094430Z UID:ubrh23c5e0r09cntq3rst2bpro@google.com CREATED:20170412T162320Z DESCRIPTION:Call Your Representative Day \nHosted by: Physics Graduate Stud ent Committee\nIf you want to make a difference\, you have to make some noi se. We can\nhelp you find and call your congressional representatives to de mand\nfair and equitable use of scientific knowledge for the good of all.\n \nFlyer: https://drive.google.com/file/d/0Bz4x8ufYIK7fX1RKOTJIQWZxNUU/view? usp=sharing LAST-MODIFIED:20170412T163735Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Civic Engagement Week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180904T160000 DTEND;TZID=America/New_York:20180904T170000 RRULE:FREQ=WEEKLY;UNTIL=20180918T035959Z EXDATE;TZID=America/New_York:20180904T160000 DTSTAMP:20260828T094430Z UID:17fm0v9nr2kig55h4lurft4jrb@google.com CREATED:20180806T171618Z DESCRIPTION:Speaker: Sanjay Reddy\, University of Washington LAST-MODIFIED:20180809T142725Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160902T161500Z DTEND:20160902T171500Z DTSTAMP:20260828T094430Z UID:lc2rl2u4u68u789qsl5ckbba0k@google.com CLASS:PUBLIC CREATED:20160825T135616Z DESCRIPTION:Speaker Name: Vanita Srinivasa\n\nSpeaker Institution: LPS\, U MD\n\nTitle: Entangling semiconductor spin qubits via the Coulomb interact ion\n\nAbstract: Many proposed realizations of quantum information process ing rely on rapid and robust entanglement of coherent qubits over a wide ra nge of distances. While solid-state implementations based on electron spin qubits are potentially scalable\, spin manipulation and coupling methods th at take advantage of rapid control of the electron charge are often limited in range and remain susceptible to charge noise and relaxation. I will des cribe our theoretical approaches to addressing these challenges for spin qu bits encoded in multiple electrons within systems of coupled quantum dots. We analyze a new regime for capacitive coupling of two-electron spin qubits that leads to high theoretical fidelities for entangling gates within sili con-based implementations in the presence of charge-based decoherence. We a lso show that the three-electron resonant exchange qubit provides both a pr otected operating point for rapid single-qubit manipulation and an electric dipole moment that enables multiple approaches for long-range entangling g ates via a superconducting microwave resonator. These methods are inspired by techniques from circuit quantum electrodynamics\, Hartmann-Hahn double r esonance in NMR\, and the Cirac-Zoller gate for trapped ions.\n\n(Free lunc h served at 12:00pm) LAST-MODIFIED:20160901T171312Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180412T180000Z DTEND:20180412T193000Z DTSTAMP:20260828T094430Z UID:0ff1ssahgikgm3nvqja0fc8adp@google.com CREATED:20180403T200148Z DESCRIPTION:
SPEAKER: \; Qi Li\, Penn State University

TITLE: TopologicalSurface States and InducingSuperconductivity in Bi< sub>2Te3 Nanotubes


ABSTRACT: \; Topological insulators and topologicalsuperconductors have been th e subject of intensive research in recent years dueto their exotic behavior s as well as the possibility to host Majorana Fermions\,possibly for fault tolerant quantum computing. The signatures of topologicalsurface states in electrical transport measurements\, however\, are oftencomplicated by the b ulk conduction\, as in the case of Bi2Se3and Bi2 Te3. In his talk\, I will discuss our studies on Bi< sub>2Te3 nanotubesin order to maximally increase th e surface-to-volume ratio as well as revealingnanoscale properties. The nan otubes in the study have an outer diameter in therange of 70-120 nm and the wall width 9-12 nm\, thicker than the criticalthickness for outer-inner su rface state hybridization. The bulk conduction atlow temperatures is furthe r suppressed by disorder. Nonetheless\, themagnetoresistance exhibits quant um oscillations as a function of the magneticfield along the nanotubes.1 Detailed numerical simulations supportthat the resistance oscillat ions are arising from the topological surfacestates which have substantiall y longer localization length than that of othernon-topological states. This result demonstrates the inherent nature of the topologicalsurface states p rotected from strong disorder in the bulk. We have tried toinduce supercond uctivity in the nanotubes with superconducting Nb contacts. Wehave previous ly studied NbSe2/Bi2Se3 bilayerfilms and o bserved both proximity-induced bulk and two-dimensional surfacesuperconduct ivity.2\,3 However\, contrary to the results in thinfilms\, indu cing superconductivity in the nanotubes results in an anomalousresistance i ncrease when the Nb contact becomes superconducting. In appliedmagnetic fie lds\, the resistance increase disappears as the field reaches the Hc2< /sub>of Nb. The experimental results\, though still lacking explanation\, w ill bepresented and discussed.

1. R.Z. Du et al. Phys. Rev. B 93\, 195402 (2016)

< span>2.S.-Y.Xu et al. Nature Physic s 10\, 943-950 (2014)

3.W.Dai et al. Scientific Report 7\,7631 (2017)





HOST: Ichiro Takeuchi LAST-MODIFIED:20180403T200148Z LOCATION:Room 1201 John S Toll Bldg.\, Refreshments at 1:30 in room 1117 of the Toll Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Qi Li\, Penn State Univ TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161019T190000Z DTEND:20161019T200000Z DTSTAMP:20260828T094430Z UID:1bb8d149iuncltuqhh6q1qgjng@google.com CREATED:20161017T181357Z DESCRIPTION:Speaker Name: Prof. Amir Safavi-Naeini\n\nSpeaker Institution : Department of Applied Physics\, Stanford University\n\nTitle:Silicon Optom echanics\, and Heterogeneous Nonlinear Microwave-Optical Translators\n\nAbs tract : In this talk I will outline two ongoing experiments at the intersec tion of optomechanics\, nonlinear optics\, and quantum electromechanics. Fi rst I will show our results on simultaneous confinement of acoustic and opt ical waves on the surface of silicon-on-insulator (SOI) chips. While silico n on insulator (SOI) is a natural platform for photonics\, it is not as wel l suited for on-chip phononics and acoustic waveguiding. The high index con trast between silicon and silica glass readily allows for confinement of op tical fields to the silicon device layer. But silicon's relative stiffness -- and therefore high sound velocity -- makes guiding acoustic waves challe nging. The intuition of “index-guided” confinement of mechanical modes fail s for sub-wavelength structures. The second effort I will present is our pr ogress on heterogeneous integration of Lithium Niobate with silicon photoni c and superconducting circuits for implementation of microwave-to-optical c onverters. LAST-MODIFIED:20161017T181511Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170714T200000Z DTEND:20170714T210000Z DTSTAMP:20260828T094430Z UID:05sr42kq5lj88nc05rkos99ng8@google.com CLASS:PUBLIC CREATED:20170710T140653Z DESCRIPTION:Speaker: Tobias Huber\, JQI\n\nTitle: Quantum dots and entangle ment\n\nAbstract: In this talk I will introduce some basic principles of se miconductor quantum dots and show how their discrete energy spectrum can be used to generate entangled photon pairs and spin photon entanglement. I wi ll show\, how a virtual level and two photon excitation can be used to exci te a (single photon) forbidden transition. And if the time allows\, I will show how different degrees of freedom can be used simultaneously to generat e hyper-entangled photon pairs.\n\n\n(The JQI summer school is for students and postdocs\, but others are welcome to join for refreshments afterwards\ ; Discussion with refreshments at 5:00pm) LAST-MODIFIED:20170710T140653Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180910T150000Z DTEND:20180910T153000Z DTSTAMP:20260828T094430Z UID:51rubs7vqimsg6m0t28vhq144d@google.com CREATED:20180904T174203Z DESCRIPTION:Title: Creating and imaging atomic wave functions with diffract ion-breaking resolution.\n\nSpeaker: Yang Wang\, JQI\n\nTitle: Creating and imaging atomic wave functions with diffraction-breaking resolution.\n\nAbs tract: Optical trapping and imaging of atoms plays an essential role in col d-atom physics\, ranging from precision measurement to the study of correla ted many body systems. Due to the diffraction limit\, trapping and imaging are typically limited to length scales on the order of the wavelength of th e light. The nonlinear response of three-level atoms\, however\, supports a dark state with spatial structures much smaller than the wavelength. In this talk\, I will present the experimental use of such dark state spatial structure to both create optical potentials and probe the atomic wave funct ion with a resolution of lambda/50\, far below the diffraction limit. The o ptical potential physically realizes a Kronig-Penney lattice of near delta- function barriers with widths below 10nm. The coherent nature of our approa ch also provides a fast temporal resolution (500 ns)\, with which we could observe the quantum motion of atoms inside the unit cell of an optical latt ice. \n\nReference:\n\n[1] arXiv: 1807.02871\n\n[2] PRL 120\, 083601 (2018) LAST-MODIFIED:20180905T193341Z LOCATION:ATL 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170510T200000Z DTEND:20170510T213000Z DTSTAMP:20260828T094430Z UID:lsffbjlpgkie9a5dqfq1uv2obs@google.com CREATED:20170508T131535Z DESCRIPTION:Speaker: Manus Visser\n\nSpeaker Institution: University of Ams terdam\n\nTitle: Verlinde’s theory of emergent gravity: a status report.\n\ nAbstract: Recently Verlinde proposed that the flattening of galaxy rotatio n curves is due to a modification of Einstein gravity at long distances. I will explain why Einstein gravity has to be modified at galactic scales acc ording to Verlinde\, and how the universal acceleration scale which appears in rotation curves arises naturally from an entropic argument. Moreover\, I will discuss a first test of Verlinde’s formula for the extra dark gravit ational force which uses weak lensing. (Based on: arXiv 1611.02269\, 1612.0 3034.) LAST-MODIFIED:20170508T131535Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180921T170000Z DTEND:20180921T180000Z DTSTAMP:20260828T094430Z UID:26b8b1ubh98iebdf37ufv33jq0@google.com CREATED:20180905T145903Z DESCRIPTION:Speaker: Liangbing Hu\, Associate Professor\, Materials Scie nce &\; Engineering\, UMCP

Title: Materials Innovations fo r Emerging Energy Technologies

Abstract: Dr. Hu wi ll start by giving an overview of active research activities in his researc h group located at UMD Energy Research Center\, including wood materials to ward sustainability\, 3000K high temperature materials and processing (Scie nce 2018)\, and beyond-Li ion batteries (solid state\, Na-ion). Then he wil l focus on recent developments:

(1) Garnet-based solid-state Li-me tal batteries including interface engineering to improve the wetting betwee n Li metal anode and garnet solid-state electrolyte (Nature Materials 2016\ ; JACS 2016\; Advanced Materials 2017\; Science Advances 2017)\; Garnet bas ed 3D Li ion conductive framework toward high energy density Li-S batteries (EES 2017)\; Garnet nanofiber based flexible\, hybrid electrolyte with a h igh Li ion conductivity (PNAS 2016).

(2) Assembly and functionaliz ation strategies of wood nanocellulose aimed at specific properties\, with an eye toward high impact applications including energy\, electronics\, bui lding materials and water treatment\, including nanomanufacturing and light management in transparent nanopaper for optoelectronics (as a replacement of plastics)\; mechanical properties of densely packed nanocellulose for li ghtweight structural materials (replacement of steel\, Nature 2018)\; artif icial tree for high-performance water desalination and solar steam generati ons\; mesoporous\, three-dimensional carbon derived from wood for advanced batteries (replacement of metal current collectors for beyond Li-ion batter ies). LAST-MODIFIED:20180905T152510Z LOCATION:2108 Chem/Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161008T140000Z DTEND:20161008T160000Z DTSTAMP:20260828T094430Z UID:aputtfqpgta8ngmb4gt4spb344@google.com CREATED:20160926T200543Z DESCRIPTION:Speaker: Paulo Bedaque\nQuantum Mechanics is the truest and we irdest thing you’ll ever know\n\nUnderlying the reality we see on daily lif e there is another one much more mysterious. \n\nIt is ruled by laws that a re hard to believe or even imagine.\n\nI will show what those laws are and how they explain the existence of atoms\, the structure of the Universe and everything in between.\n\n\n\n LAST-MODIFIED:20160926T200746Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Quantum Mechanics TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171009T160000 DTEND;TZID=America/New_York:20171009T170000 DTSTAMP:20260828T094430Z UID:7lt08t63akq1aj04pdbnqlaibo@google.com RECURRENCE-ID;TZID=America/New_York:20171009T160000 CREATED:20170906T191250Z DESCRIPTION:Title : Light sheet fluorescence microscopy for fast\, gentle\, and high resolution imaging\nSpeaker Name: Dr. Abhishek Kumar\nSpeaker Ins titution : Center for Nanoscale Science and Technology\, NIST/IREAP\, UMD\n Notes: http://www.marylandbiophysics.umd.edu/seminars/\nAbstract : Light Sh eet Fluorescence Microscopy (LSFM) has emerged as a powerful fluorescence m icroscopy tool for cell and developmental biology. LSFM is very well suited for long term imaging as it offers optical sectioning\, high-speed imaging \, and low photobleaching and phototoxicity. I will give a brief overview o f this field and then discuss our implementation of LSFM: a fiber coupled d ual-view inverted Selective Plane Illumination Microscope (diSPIM). DiSPIM provides an isotropic resolution of 350 nm by computationally fusing two vo lumetric views acquired by switching illumination and detection between two perpendicular objectives in an alternating duty cycle. Isotropic resolutio n is advantageous for many biological applications and I will discuss few e xamples. I will also discuss our latest improvements to the diSPIM - increa sing contrast\, resolution and optical sectioning. Finally\, I will conclud e by discussing functional imaging of C. elegans nervous system during embr yogenesis using diSPIM.\n LAST-MODIFIED:20171003T134940Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171030T150000Z DTEND:20171030T163000Z DTSTAMP:20260828T094430Z UID:77733nlgfgl4l2b858of9cfecv@google.com CREATED:20170831T160743Z DESCRIPTION:Speaker: Phiala Shanahan\n\nSpeaker Institution: College of Wil liam and Mary\n\nTitle: Gluon structure of hadrons and nuclei\n\nAbstract: The construction of an electron-ion collider (EIC) designed to reveal new i nformation about the gluon structure of hadrons and nuclei is planned\, wit h data taking expected within the next decade. I will describe recent latti ce QCD studies of the gluon generalised form factors of both hadrons and li ght nuclei\, motivated by providing Standard Model predictions for quantiti es to be measured for the first time at the future EIC. I will focus in par ticular on the transversity gluon structure quantities which are of interes t since they are purely gluonic and do not mix with quark distributions. In light nuclei these quantities moreover provide a clean signature of non-nu cleonic gluon degrees of freedom\, which have not yet been observed. LAST-MODIFIED:20171027T173633Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170221T160000Z DTEND:20170221T171500Z DTSTAMP:20260828T094430Z UID:vmb691e6lipg40p0i0s7j0jpk0@google.com CREATED:20170109T165359Z DESCRIPTION:Speaker: Senthil Todadri (MIT)\n\nTitle: Composite Fermi Liquid s in the Lowest Landau Level\n\nAbstract: I will describe recent work on me tallic states of matter - known as composite fermi liquids - in the quantum Hall regime in two dimensions. Remarkably the physics of these states are closely related to the physics of surface states of interacting topological insulators in 3 dimensions\, and to the physics of quantum spin liquids in 3d magnets. These relationships provide new insights into all of these dif ferent problems. In this talk I will focus on the progress made in the theo ry of the composite fermi liquids itself.\n\nLocation: 2205 John S. Toll Ph ysics Building\n\nHost: Xiao Li\n\nhttp://www.physics.umd.edu/cmtc/seminars .html LAST-MODIFIED:20170213T234758Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180212T210000Z DTEND:20180212T223000Z DTSTAMP:20260828T094430Z UID:68olanvdgbde4lqabekhctae6k@google.com CREATED:20180207T172326Z DESCRIPTION:\nSpeaker: Anson Hook\n\nSpeaker Institution: University of Mar yland\n\nTitle: Solving the Hierarchy Problem Discretely \n\nAbstract: We present a new solution to the Hierarchy Problem utilizing non-linearly real ized discrete symmetries. The cancelations occur due to a discrete symmetry that is realized as a shift symmetry on the scalar and as an exchange symm etry on the particles with which the scalar interacts. We show how this mec hanism can be used to solve the Little Hierarchy Problem as well as give ri se to light axions. LAST-MODIFIED:20180207T172811Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161118T171500Z DTEND:20161118T181500Z DTSTAMP:20260828T094430Z UID:pi2idp7jitse5n4d496bd7jo5s@google.com CREATED:20161109T145735Z DESCRIPTION:Speaker Name: Tobias Grass\n\nSpeaker Institution: JQI\n\nTitle : Trapped ions as a quantum spin glass annealer\n\nAbstract: Solving spin glass models is a complex\, often NP-hard\, task. In this talk\, I will di scuss a strategy to attack this problem using trapped ions as a flexible em ulator of spin Hamiltonians. Studying its dynamics in a slowly decaying mag netic field\, such system can be used as a quantum annealer which might be capable of solving hard optimization problems in polynomial time. LAST-MODIFIED:20161111T144729Z LOCATION:PSC 2136\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180213T181500Z DTEND:20180213T191500Z DTSTAMP:20260828T094430Z UID:0gqno1hhc85q4kasflv719uvlt@google.com CREATED:20180205T163100Z DESCRIPTION:Speaker: Dr. Momcilo Gavrilov\, John Hopkins University< br>
Title: Direct Measurement of a Weakly Nonequilibrium System E ntropy using a Feedback Trap

Abstract: Gavrilov abstract The entropy function for an equilibrium system has a Gibbs-Shannon form\; howe ver\, there is a long\, sometimes contentious debate as to whether the Gibb s-Shannon form applies to systems out of equilibrium. Here\, I present the first direct measurement of the entropy function for a system out of equil ibrium. In a feedback trap\, I confine a silica bead immersed in water in a virtual double-well potential that models a two-state system capable of s toring maximum one bit of information. By measuring the average work to er ase a controlled fraction of the information\, I isolate directly the chang e in entropy in a nonequilibrium system and show its compatibility with the Gibbs-Shannon form. Further\, by measuring the reversibility of slow prot ocols used to transform the system\, I show how to distinguish unambiguousl y between protocols that can and cannot reach the expected thermodynamic bo unds. LAST-MODIFIED:20180205T163212Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180507T200000Z DTEND:20180507T210000Z DTSTAMP:20260828T094430Z UID:0pv9lgsops42n7dnbikfrj80sd@google.com CREATED:20180405T154012Z DESCRIPTION:Speaker Name: Pablo Sartori

Speaker I nstitution : Rockefeller University

Title : Dynamics of cilia: mechanical response\, chirality and phenotypic variability

Abstract : Cilia are model systems for studying ho w mechanical forces control morphology. Their periodic bending motion is th ought to arise from a mechano-chemical feedback: motors generate mechanical forces that bend the cilium\, and bending leads to deformations that regul ate the motors. Through a combined theoretical and experimental approach we determine that motors respond to the time derivative of the ciliary curvat ure. Further modeling predicts that the chiral asymmetry of the cilium is a key player in this response mechanism. Ongoing work exploits our model to rationalize the effects of genotypic and phenotypic variability on recorded ciliary wave-forms. \;




 LAST-MODIFIED:20180504T195351Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161107T200000Z DTEND:20161107T213000Z DTSTAMP:20260828T094430Z UID:v1r1vrolqsp277m203m0vbffcs@google.com CREATED:20161104T141206Z DESCRIPTION:Speaker: Prateek Agrawal\n\nSpeaker Institution: Harvard Univer sity\n\nTitle: Darkly Charged Dark Matter\n \nAbstract: A simple model for dark matter is an analog of QED\, where the dark matter is a weak-scale par ticle charged under a U(1) gauge symmetry\, completely decoupled from the S tandard Model. This model can realize the WIMP miracle\, and gives rise to interesting observables due to self-interactions\, modifying halo shapes. I f we also add a small fraction of light particles -- dark electrons -- they catalyze the coupling between the dark matter and dark radiation in the ea rly universe. Consequently\, structure formation can be dramatically altere d\, constraining the model from observations of Lyman-\\alpha and Milky Way satellites. The dark electron leads to dissipative dynamics for dark matt er\, which can form late time structures like a dark disk or clouds\, much like baryonic matter. I will discuss an intriguing possibility that the gal actic center gamma-ray excess could be coming from point sources made out o f dark matter. LAST-MODIFIED:20161104T141206Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180911T160000 DTEND;TZID=America/New_York:20180911T170000 DTSTAMP:20260828T094430Z UID:17fm0v9nr2kig55h4lurft4jrb@google.com RECURRENCE-ID;TZID=America/New_York:20180911T160000 CREATED:20180806T171618Z DESCRIPTION:Title: The ultimate collision: Neutron stars rattle\, shine and sparkle\n\nSpeaker: Sanjay Reddy\, University of Washington\n\nAbstract: G W170817\, the first observed neutron star merger\, marks the beginning of a new era of multi-messenger astronomy. The gravitational and electromagneti c waves observed from this event confirmed theoretical expectations and pro vided new insights about the properties of neutron stars and the synthesis of heavy elements in the universe. I will describe the underlying nuclear p hysics relevant to modeling these extreme collisions and discuss how future observations and improved models can help address long-standing questions in nuclear and particle astrophysics. During the next decade multi-messenge r observations of several neutron star mergers\, detailed x-ray observation s of neutron stars in our galaxy\, and the detection of neutrinos from a mu ch anticipated galactic supernova can revolutionize astrophysics if we can develop and validate multi-physics models to interpret this data. I will di scuss some of the open questions in this context and efforts to address the m.\n\nHosted by: Zohreh Davoudi LAST-MODIFIED:20180911T211632Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171031T160000 DTEND;TZID=America/New_York:20171031T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171031T160000 CREATED:20170809T180226Z DESCRIPTION:Jaideep Singh\, Michigan State\nHosted by: Charles Clark\nSearc hing for the Origin of Matter Using Pear-Shaped Nuclei\nExperimental tests of fundamental symmetries using nuclei and other particles subject to the s trong nuclear force have led to the discovery of parity (P) violation and t he discovery of charge-parity (CP) violation. It is believed that addition al sources of CP-violation may be needed to explain the apparent scarcity o f antimatter in the observable universe. A particularly sensitive and unamb iguous signature of both time-reversal- (T) and CP-violation would be the e xistence of an electric dipole moment (EDM). The next generation of EDM sea rches in a variety of complimentary systems will have unprecedented sensiti vity to physics beyond the Standard Model. My talk will focus on certain ra re diamagnetic atoms which have pear-shaped nuclei. This uncommon nuclear s tructure significantly amplifies the observable effect of T\, P\, & CP-viol ation originating within the nuclear medium when compared to isotopes with nearly spherical nuclei such as Mercury-199. Certain isotopes of Radium (Ra )\, Protactinium (Pa)\, and Radon (Rn) are all expected to have enhanced at omic EDMs and will be produced in abundance at the Facility for Rare Isotop e Beams currently under construction at Michigan State University. I will d escribe the status of the ongoing Ra-225 EDM search located at Argonne Nati onal Lab as well as the prospects for next generation searches for time-rev ersal violation in the FRIB-era with a particular emphasis on Pa-229.\n\nht tps://doi.org/10.1103/PhysRevLett.114.233002\n\nhttps://doi.org/10.1103/Phy sRevC.94.025501\n\nhttps://arxiv.org/abs/1710.02504\n LAST-MODIFIED:20171013T150716Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170412T150000Z DTEND:20170412T160000Z DTSTAMP:20260828T094430Z UID:2k5d2oaimppt5bsp418kp8us50@google.com CREATED:20170406T125206Z DESCRIPTION:Speaker: Ben Reichardt\n\nSpeaker Affiliation: U. Southern Cali fornia\n\nTitle: Tests for small quantum devices\n\nAbstract: Reliable qubi ts are difficult to engineer. What can we do with just a few of them? Her e are some ideas: \n \n1. Memory/dimensionality test. An n-qubit system ha s 2^n dimensions---a big reason for quantum computers' exponential power! But systems with just polynomial(n) dimensions can look like they have n qu bits. We give a test for verifying that your system really has 2^n dimensi ons. \n \n2. Entanglement test. A Bell-inequality violation establishes t hat your systems share some entanglement (i.e.\, there's no classical expla nation). We give a test to show that your systems share lots of entangleme nt. \n \n3. Extended Einstein-Podolsky-Rosen (EPR) test. Classical hidden variables can't explain a Bell inequality violation\, but another non-quan tum theory could explain it: non-signaling correlations like the Popescu-Ro hrlich nonlocal box. We give a test\, using three spacelike-separated devi ces\, to eliminate non-signaling explanations. \n \n4. Error correction te st. Error correction will be needed for scalable quantum computers. But h igh qubit overhead makes it impractical for small devices. We show that a 7-qubit computer can fault tolerantly correct errors on one encoded qubit\, and that a 17-qubit computer can protect and compute fault tolerantly on s even encoded qubits. LAST-MODIFIED:20170407T180414Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160421T123000 DTEND;TZID=America/New_York:20160421T133000 RRULE:FREQ=WEEKLY;UNTIL=20160609T163000Z;BYDAY=TH EXDATE;TZID=America/New_York:20160526T123000 EXDATE;TZID=America/New_York:20160602T123000 EXDATE;TZID=America/New_York:20160609T123000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8_R20160421T163000@google.com CREATED:20160328T173052Z DESCRIPTION:Speaker Name: \nSpeaker Institution: \nTitle: \nAbstract: LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170503T200000Z DTEND:20170503T210000Z DTSTAMP:20260828T094430Z UID:a4vbgk2qief76h4lvl76jfhi80@google.com CREATED:20170428T140217Z DESCRIPTION:Speaker Name: Min-A Cho\n\nSpeaker Institution : University of Maryland\n\nTitle : "Prompt Searches for Gravitational Waves and their Elec tromagnetic Counterparts with Advanced LIGO and VIRGO"\n\nAbstract : I will focus my talk on how the advanced ground-based GW detectors work\, our low -latency searches and electromagnetic follow-up program\, and the astrophys ics of joint GW-electromagnetic radiation progenitors. LAST-MODIFIED:20170428T140314Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171002T150000Z DTEND:20171002T163000Z DTSTAMP:20260828T094430Z UID:01k39r44mu642m8mj78f553b8m@google.com CREATED:20170831T152531Z DESCRIPTION:Speaker: Aleksey Cherman\n\nSpeaker Institution: University of Washington\n\nTitle: Order parameters and color-flavor center symmetry in Q CD\n\nAbstract: Common lore suggests that N-color QCD with massive quarks h as no useful order parameters which can be non-trivial at zero baryon densi ty. However\, such order parameters do exist when there are nf quark flavor s with a common mass and d≡gcd(n_f\,N) > 1. These theories have a Z_d color -flavor center symmetry arising from intertwined color center transformatio ns and cyclic flavor permutations. The symmetry realization depends on the temperature\, baryon chemical potential and value of n_f/N\, with implicati ons for conformal window studies and dense quark matter. LAST-MODIFIED:20170921T183612Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160420T190000Z DTEND:20160420T200000Z DTSTAMP:20260828T094430Z UID:jpcq810i2rpg7g4c4bd7cgr2lg@google.com CREATED:20160414T155751Z DESCRIPTION:Speaker Name: Prof. Per Delsing\n\nSpeaker Institution : Chalme rs University of Technology\n\nTitle : Qubits coupled to sound\n\nAbstract : We present a mechanical quantum device\, where propagating surface acoust ic wave (SAW) phonons couple to a superconducting qubit. This type of coupl ing can be very strong\, and in our case it exceeds the coupling to any ext ernal electromagnetic mode. The SAW waves propagate freely on the surface o f the piezoelectric (GaAs) substrate\, and we use a remote electro-acoustic transducer to address the qubit acoustically. Three different experiments are presented: i) Exciting the qubit with an electromagnetic signal we can “listen” to the SAW phonons emitted by the qubit. ii) Reflecting a SAW wave off the qubit\, we observe a nonlinear reflection with strong reflection a t low power and low reflection at high power. iii) Exciting the qubit with both an electromagnetic signal and with a SAW signal\, we can do two tone s pectroscopy on the qubit. In all of these experiments we find a good agreem ent between experiment and theory. Future developments including giant atom s\, ultrastrong coupling\, and single phonon physics is also discussed. Esp ecially\, new experimental results with circuits on lithium niobate will be discussed.\n[1] M.V. Gustafsson et al.\, Science 346\, 207 (2014)\n[2] A. Frisk-Kockum et al.\, Phys. Rev. A\, 90\, 013837 (2014)\n[3] T. Aref et al. \, In: Superconducting Devices in Quantum Optics\, Eds.: R.H. Hadfield\, G. Johansson\, (Springer\, 2016) \;arXiv:1506.01631\n\nFor more information p lease contact Ari Mizel [ari@lps.umd.edu] or Thomas Murphy [tem@umd.edu] .\ nNote: LPS is located at 8050 Greenmead Drive in College Park. There is par king at LPS and overflow parking at the adjacent LTS building but not at th e 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtya rd Apts. Please use the phone on the left hand side of the front door to ca ll the receptionist for entry.\n\n\n LAST-MODIFIED:20160414T155925Z LOCATION:LPS SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161216T171500Z DTEND:20161216T181500Z DTSTAMP:20260828T094430Z UID:7ifs4bsm4ai2pg2i39qgk6ljh0@google.com CREATED:20161207T154959Z DESCRIPTION:Title : Disorder-induced quantized pumping in a Floquet topolog ical phase\n\nSpeaker Name: Paraj Titum\n\nSpeaker Institution: JQI\, QuICS \n\nAbstract: In this talk\, we show that two-dimensional periodically driv en quantum systems with spatial disorder admit a unique topological phase. This phase is characterized by a quasi-energy spectrum featuring chiral edg e modes coexisting with a fully localized bulk. Such a spectrum is impossib le for a time-independent\, local Hamiltonian. These unique characteristics give rise to a new topologically protected non-equilibrium transport pheno menon: quantized\, yet non-adiabatic\, charge pumping. This phase is separa ted from a trivial Anderson insulating phase by a phase transition.\n\n*Lun ch served at 12pm!* LAST-MODIFIED:20161212T183718Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170928T123000 DTEND;TZID=America/New_York:20170928T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20170928T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nJaideep Pathak\nUniversity of Maryland/ IREAP\nTitle: A Model-Free Machine Learning Technique for Studying High Dimensional Spat iotemporal Chaos\nAbstract: Networks of nonlinearly interacting neuron-like units have the capacity to approximately reproduce the dynamical behavior of a wide variety of dynamical systems. We demonstrate the use of such neur al networks for reconstruction of chaotic attractors from limited time seri es data using a machine learning technique known as reservoir computing. Th e orbits of the reconstructed attractor can be used to obtain approximate e stimates of the ergodic properties of the original system. As a specific ex ample\, we focus on the task of determining the Lyapunov exponents of a sys tem from limited time series data. Using the example of the Kuramoto-Sivash insky system\, we show that this technique offers a robust estimate of a la rge number of Lyapunov exponents of a high dimensional spatiotemporal chaot ic system. We further develop an effective\, computationally parallelizable technique for model-free prediction of spatiotemporal chaotic systems of a rbitrarily large spatial extent and dimension purely from observations of t he system's past evolution. LAST-MODIFIED:20170925T130450Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180917T200000Z DTEND:20180917T210000Z DTSTAMP:20260828T094430Z UID:3glkb2jvdjrohdg1dkge8dtvuv@google.com CREATED:20180829T175109Z DESCRIPTION:Speaker: Hari Shroff\, NIH/NIBIB\n\nTitle : Biological Imaging at High Spatiotemporal Resolution\n\nNotes: http://www.marylandbiophysics.u md.edu/seminars/\nAbstract : I will discuss our latest attempts to improve fluorescence microscopy techniques for following live biological phenomena at high spatiotemporal resolution. Emphasis will be given to structured ill umination microscopy (SIM) and light-sheet microscopy (LSFM) techniques.\n\ nSIM1 doubles the spatial resolution of light microscopy\, requiring lower light intensities and acquisition times than other super-resolution techniq ues. I will present SIM implementations that enable resolution doubling in live volumes > 10-20x thicker2-4 than possible with conventional SIM\, as w ell as hardware modifications that enable effectively ‘instant’ SIM3\,5 ima ging at rates 10-100x faster than other SIM. New applications of instant SI M\, including combination with total internal reflection (TIRF) and with ad aptive optics6 will also be discussed.\n\nThe second half of the talk will focus on the development of inverted selective plane illumination microscop y (iSPIM)\, and subsequent application to the noninvasive study of neurodev elopment in nematodes7. I will discuss progress that quadruples the axial r esolution of iSPIM by utilizing a second specimen view\, thus enabling imag ing with isotropic spatial resolution (dual-view iSPIM\, or diSPIM8\,9). Ne wer multiview results with more objectives10 and more views11\, further imp roving spatial resolution\, will also be shown. Applications of these techn ologies will be presented\, including computational methods for untwisting worm embryos12\, with the goal of building a neurodevelopmental atlas with subcellular resolution13.\n\nTime permitting\, I will also discuss 3 new an d unpublished research projects in my lab: (1) rapid\, sensor-less adaptive optics for use in SIM and LSFM\; (2) 3D orientation sensing via multi-view fluorescence polarization\; (3) structured illumination microcopy with ~5- fold improvement in axial resolution. LAST-MODIFIED:20180910T194400Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170719T150000Z DTEND:20170719T160000Z DTSTAMP:20260828T094430Z UID:6t8g64lvcl9irolrs199d9mslo@google.com CREATED:20170605T133446Z DESCRIPTION:Speaker: Frédéric Dupuis\n\nSpeaker Affiliation: Masaryk Univer sity\n\nTitle: Adaptive vs nonadaptive strategies in the quantum setting wi th applications\n\nAbstract: We prove a general relation between adaptive a nd nonadaptive strategies in the quantum setting\, i.e.\, between strategie s where the adversary can or cannot adaptively base its action on some auxi liary quantum side information. Our relation holds in a very general settin g\, and is applicable as long as we can control the bit-size of the side in formation\, or\, more generally\, its "information content". Since adaptivi ty is notoriously difficult to handle in the analysis of (quantum) cryptogr aphic protocols\, this gives us a very powerful tool: as long as we have en ough control over the side information\, it is sufficient to restrict ourse lves to non-adaptive attacks.\n\nWe demonstrate the usefulness of this meth odology with two examples. The first is a quantum bit commitment scheme bas ed on 1-bit cut-and-choose. Since bit commitment implies oblivious transfer (in the quantum setting)\, and oblivious transfer is universal for two-par ty computation\, this implies the universality of 1-bit cut-and-choose. The second example is a quantum bit commitment scheme proposed in 1993 by Bras sard et al. It was originally suggested as an unconditionally secure scheme \, back when this was thought to be possible. We partly restore the scheme by proving it secure in (a variant of) the bounded quantum storage model.\n \nIn both examples\, the fact that the adversary holds quantum side informa tion obstructs a direct analysis of the scheme\, and we circumvent it by an alyzing a non-adaptive version\, which can be done by means of known techni ques\, and applying our main result. LAST-MODIFIED:20170605T133446Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180403T171500Z DTEND:20180403T181500Z DTSTAMP:20260828T094430Z UID:5ajpm53fveu8f26k5ov0fs0ui7@google.com CREATED:20180327T153557Z DESCRIPTION:Speaker: John D. Weeks\, UMCP\, Department of Chemistry and Biochemistry


Title: Dissecting Direct and Indirect Intermolecular Forces in Simple and Polar Liquids


Abstract: \;A characteristic feature of David Chandler's research was his ability to extend simple physical pictures and theoretical constructs in surprising n ew directions\, often challenging conventional wisdom in the field. Here I mention three examples\, all dealing with intermolecular forces in equilibr ium liquids. I first discuss the early work Chandler and I did with Hans An dersen on the  \;structure and thermodynamics of simple uniform liquids (WCA theory)\, which builds on key ideas from van der Waals and Widom invo lving repulsive and attractive forces. Then early in his academic career Ch andler and Lawrence Pratt fearlessly applied some of those ideas along with new theoretical arguments to a much more difficult problem\, hydrophobic s olvation and association in water\, leading to the Pratt-Chandler (PC) theo ry of hydrophobicity. In the mid 1990's my group at Maryland began work on a new extension of van der Waals ideas to nonuniform systems and to interfa ce formation\, which we called local molecular field (LMF) theory. During a memorable sabbatical leave in 1998\, Chandler\, Ka Lum\, and I generalized PC and LMF ideas to argue that interface formation plays a key role in hyd rophobic association of extended hydrophobic objects. I will try to present qualitative and physically suggestive arguments for the accuracy of all th ese generalizations\, and discuss how working with David Chandler shaped th is research and my approach to scientific research in general. New applicat ions of LMF theory and further details of the theory will be presented  \;tomorrow \;in the physical chemistry seminar. \; \;

 LAST-MODIFIED:20180327T153557Z LOCATION:1116 IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180212T210000Z DTEND:20180212T220000Z DTSTAMP:20260828T094430Z UID:2plrtp4qa1onq4qaov3lud6tl2@google.com CREATED:20180119T145522Z DESCRIPTION:Speaker Name: Igor Aronson\n\nSpeaker Institution : Penn State University\n\nTitle : Topological defects in a living nematic\n\nNotes: htt p://www.marylandbiophysics.umd.edu/seminars/spring2018.php\n\nAbstract : Li ving nematic is a realization of an active matter combining a nematic liqui d crystal with swimming bacteria [1]. The material exhibits a remarkable te ndency towards spatio-temporal self-organization manifested in the formatio n of dynamic textures of self-propelled half-integer topological defects (d isclinations or vortices). The well-established and validated model of nema tic liquid crystals coupled to the bacterial dynamics is used to describe i ntricate properties of such a living nematic. The model yielded a testable prediction on the accumulation of bacteria in the cores of 1/2 topological defects and depletion of bacteria in the cores of -1/2 defects [2]. We also studied of such living nematic near normal inclusions\, or tactoids\, natu rally realized in liquid crystals close to the isotropic-nematic (I-N) phas e transition. On the basis of the computational analysis\, we have establis hed that tactoid's I-N interface spontaneously acquire negative topological charge which is proportional to the tactoid's size and depends on the conc entration of bacteria. The observed negative charging is attributed to the drastic difference in the mobilities of 1/2 and -1/2 topological defects in active systems. The effect is described in the framework of a kinetic theo ry for point-like weakly-interacting defects with different mobilities. Our dedicated experiments fully confirmed both theoretical predictions. The re sults hint into new strategies for control of active matter. LAST-MODIFIED:20180119T145820Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160926T190000Z DTEND:20160926T203000Z DTSTAMP:20260828T094430Z UID:nob4nlsh48oc0brnokgjgqf57o@google.com CREATED:20160915T134150Z DESCRIPTION:Speaker Name: Chris Brust\n\nSpeaker Institution: Perimeter Ins titute\n\nTitle: A Partially Massless Higher-Spin Theory\n \nAbstract: I wi ll describe an extension of the D-dimensional Vasiliev higher-spin gauge th eory on AdS or dS to include partially massless states\, as well as its CFT dual\, a free scalar U(N) or O(N) model with a fourth-order kinetic term. I'll discuss various checks of AdS/CFT in this case\, including the matchin g of the underlying symmetry algebra (an extension of the usual hs algebra) \, the matching of masses of particles without any gauge symmetry\, the mat ching of dimension-specific nuances in the theories\, and finally the consi stency of the one-loop correction to the inverse Newton's constant. I will also speculate on the role of this theory in a putative dS/CFT corresponden ce. LAST-MODIFIED:20160915T203344Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170216T173000Z DTEND:20170216T183000Z DTSTAMP:20260828T094430Z UID:ntineedj34jb5qndomuu6ijfg8@google.com CREATED:20170213T153814Z DESCRIPTION:The Effects of Deep Turbulence in the Atmosphere on Propagatin g Laser Beams and how to Characterize and Correct these Effects\n\n*PHYS 79 8E and ENEE 698D*\n\nProfessor Christopher C. Davis\, Minta Martin Prof. of Engineering and Prof. of ECE\, UMD\n\n ABSTRACT: When laser beams propagat e on relatively long paths (1-5 km) in the low atmosphere they experience w hat is called “deep” turbulence. The laser beam becomes severely distorted\ , and breaks into multiple patches. The characterization and correction of these effects is very important for free space optical communication system s and for laser weapons systems. This talk will describe the use of plenopt ic sensors and the phenomenon of enhanced backscatter for characterizing th e beam distortions and providing information to an adaptive optics system t o correct these distortions. The plenoptic sensor also allows improved imag ery to be obtained through a distorting atmosphere. The challenges of using coherent combining of high power lasers as a means for correcting overall beam distortion on a distant target will also be discussed.\n\nBIO: Christo pher C. Davis is Minta Martin Professor of Engineering and Professor of Ele ctrical and Computer Engineering at the University of Maryland\, College Pa rk. He received the B.A. degree (with Honors) in Natural Sciences from the University of Cambridge in 1965\, the M.A. degree from the University of Ca mbridge in 1970\, and the Ph.D. degree in Physics from the University of Ma nchester in 1970. From 1973-1975 he was a Instructor/Research Associate at Cornell University\, and from 1982-83 was a Senior Visiting Fellow at the U niversity of Cambridge. He is a Fellow of both the Institute of Physics and the IEEE. Professor Davis is the author of the widely used text “Lasers an d Electro-Optics\,” published by Cambridge University Press\, and co-author with Jack Moore and Mike Coplan of the best-selling text “Building Scienti fic Apparatus\,” now in its 4th edition published by Cambridge University P ress. He is author or co-author of 14 chapters in books\, over 245 referee d journal articles and over 300 conference papers\, and is editor of 10 vol umes of SPIE Proceedings. He holds sixteen awarded and several pending pate nts. His currently active research is in optical and directional RF wireles s\, directed energy\, optical sensors\, hybrid networks\, laser interferome try\, dielectrometry\, atmospheric turbulence\, optical communication syste ms and devices\, and biophysics. \n LAST-MODIFIED:20170213T154026Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160923T161500Z DTEND:20160923T171500Z DTSTAMP:20260828T094430Z UID:nptqcs7j7osk59a0po0a7ejbv4@google.com CREATED:20160914T150329Z DESCRIPTION:Speaker Name: Zachary Eldredge\n\nSpeaker Institution: JQI and QuICS \n\n(Free lunch served at 12:00pm!)\n\nTitle: Optimal and Secure Meas urement Protocols for Quantum Sensor Networks\n\nAbstract: Studies of quant um metrology have shown that the use of many-body entangled states can lead to an enhancement in sensitivity when compared to product states. In this paper\, we quantify the metrological advantage of entanglement in a setting where the quantity to be measured is a linear function of parameters coupl ed to each qubit individually. We first generalize the Heisenberg limit to the measurement of non-local observables in a quantum network\, deriving a bound based on the multi-parameter quantum Fisher information. We then prop ose a protocol that can make use of GHZ states or spin-squeezed states\, an d show that in the case of GHZ states the procedure is optimal\, i.e.\, it saturates our bound. LAST-MODIFIED:20160921T174207Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180507T193000Z DTEND:20180507T203000Z DTSTAMP:20260828T094430Z UID:7ln0ptid5hic2vlg7pr3vthbca@google.com CREATED:20180501T195906Z DESCRIPTION:Speaker Name: Brian Humensky\n\nSpeaker Institution: Columbia U niversity\n\nTitle: An Air-Cherenkov Telescope View\n\nRefreshments availa ble at 3:00 PM\n\nAbstract: Our Galaxy carries a small but important popula tion of highly energetic denizens: supernova remnants with fast shocks\, pu lsars with powerful winds\, intensely-interacting binary systems built from a compact object and a massive star. All of these environments conspire to generate populations of nonthermal particles\, and observations of the ver y high energy (VHE\; E > 100 GeV) gamma rays produced by these particles ar e gradually revealing the methods by which Nature accelerates cosmic rays\, as well as the ways in which those cosmic rays escape and diffuse into the interstellar medium. These observations include studies of cosmic-ray acce leration in the supernova remnants Cassiopeia A and IC 443\, as well as the remarkable Fall 2017 periastron passage of VER J2032+4127\, the 50-year-pe riod binary system containing PSR J2032+4127 and a Be star. Meanwhile\, bey ond our Galaxy\, the direct detection for the first time of gravitational w ave (GW) transients by Advanced LIGO has motivated searches for their elect romagnetic counterparts at all wavelengths. Neutrino astronomy is an emergi ng area of study in high-energy astrophysics\, and astrophysical neutrinos are natural cousins of VHE gamma rays. The VERITAS gamma-ray observatory ha s an active program of follow-up observations in the directions of potentia lly astrophysical high-energy neutrinos detected by IceCube\, as well as in the direction of GW transients. In this talk\, we discuss recent results f rom the VERITAS Galactic and Multi-Messenger Follow-up programs\, as well a s prospects for further advances in the field by the Cherenkov Telescope Ar ray (CTA) in the coming decade. LAST-MODIFIED:20180504T195432Z LOCATION: Location: PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170210T183000Z DTEND:20170210T200000Z DTSTAMP:20260828T094430Z UID:8o49r4ujj20prdvs45rsrlrs4k@google.com CREATED:20170203T135124Z DESCRIPTION:**Please note location**\n\nSpeaker: David Curtin\n\nSpeaker In stitution: University of Maryland\n\nTitle: Hidden Sectors and New Signatur es\n \nAbstract: The fundamental reasons to expect physics beyond the Stand ard Model are more urgent than ever\, making null results of searches at th e Large Hadron Collider (LHC) and other experiments especially puzzling. Th is points us towards new theories for addressing these fundamental mysterie s\, and new experimental approaches for discovering them. I will discuss ho w theories of Hidden Sectors can realize Naturalness\, Baryogenesis\, or Da rk Matter. My focus is the detailed phenomenology of Neutral Naturalness\, which can solve the Hierarchy Problem while escaping current LHC constraint s. Fortunately\, these and other Hidden Sector scenarios are discoverable v ia dedicated collider searches for long-lived particles (LLPs)\, and cosmol ogical or astrophysical observations. I outline the implications for future colliders\, as well as our ongoing efforts to create a systematic LLP sear ch program at the LHC in collaboration with ATLAS\, CMS and LHCb experiment alists. Exploring this Lifetime Frontier also requires new detectors\, and our proposed MATHUSLA experiment will boost the sensitivity of the HL-LHC b y orders of magnitude. LAST-MODIFIED:20170203T135124Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171005T180000Z DTEND:20171005T193000Z DTSTAMP:20260828T094430Z UID:1r0l88tpk79kn819rgeon4tpgv@google.com CREATED:20170908T195417Z DESCRIPTION:Title: Emergent Quantum Phases and Topological Superconductivit y in Correlated Materials\n \nAbstract: In the past several decades\, the focus of condensed matter physics and materials research has been on the s o-called strongly correlated electron materials. One of the most striking c onsequences of strong electron correlations is the emergence of exotic quan tum phases of matter. In this talk\, I will illustrate the phenomenon of qu antum emergence on two examples: the first is the appearance of non-trivial spin textures in frustrated spin systems – here the term “frustration” ref ers to the presence of competing interactions that cannot be simultaneously satisfied. This results in complex magnetic states\, for instance a three- dimensional "vortex crystal" which we predicted theoretically to form on fr ustrated cubic lattices\, and which has recently found an experimental conf irmation. Another fascinating example of emergent quantum order is realized in the topological phases of matter\, which differ from the conventional L andau-Ginzburg paradigm in that no local order parameter can be identified\ , yet the non-trivial topology distinguishes the material from a featureles s metal or insulator. In particular\, I will show that a heavy fermion supe rconductor UPt3 is a prime candidate for such a topological state of matter . This is a fascinating example of an emergent quantum phase with non-trivi al topology\, which we argue has tangible consequences directly measurable in an experiment. If I have time toward the end\, I will also mention our r ecent work on another class of topological superconductors in the half-Heus ler family of materials. \n\nHost: Johnpierre Paglione LAST-MODIFIED:20170929T141850Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Andriy Nevidomskyy\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171206T200000Z DTEND:20171206T210000Z DTSTAMP:20260828T094430Z UID:7o0u0k44a5ptnokhth02p73f73@google.com CREATED:20171204T180540Z DESCRIPTION:Speaker: Prof. Abram L. Falk\n\nAffiliation: IBM T.J. Watson R esearch Center\n\nTitle: Carbon nanotubes at the wafer scale\n\n(refreshmen ts available at 2:30 pm)\nAbstract: I will discuss efforts at IBM Research to develop high-performance electronic and optical devices with carbon nano tubes. Nanotubes have the potential to significantly outperform silicon\, e nabling an exciting array of 21st-century information technologies. To meet this challenge\, we have purified semiconducting nanotubes to the 99.999% level\, patterned them into narrow-pitch arrays\, and demonstrated that the y can support high-speed CMOS logic. Another one our new results is that ca rbon nanotubes support coherent plasmon resonances. These plasmons\, which comprise charge oscillations in the nanotubes coupled to electromagnetic fi elds\, can enhance light-matter interaction strengths by up to a factor of 107. They are a platform for electrically tunable optical elements\, surfac e-enhanced absorption spectroscopy\, and high-speed receivers at infrared a nd terahertz frequencies. In the long term\, carbon nanotubes could be a fo undation for unifying electrical and optical logic at the nanometer scale.\ n\nBiography: Dr. Abram Falk grew up in Portland\, OR\, received a B.A. in Physics from Swarthmore College (2003) and a Ph.D. in Physics from Harvard University (2009)\, where he was advised by Hongkun Park. His postdoctoral fellowship was advised by David Awschalom at the University of Chicago and at the University of California\, Santa Barbara\, where he was awarded the Elings Prize in Experimental Science.\n \nDr. Falk’s Ph.D. work on electric al plasmon detection demonstrated the viability of electrically integrated quantum plasmonic circuits. Later\, he developed a method for addressing in dividual electronic spin states in silicon carbide and for optically pumpin g room-temperature nuclear polarization in SiC\, a first for a material tha t plays a leading role in the semiconductor industry.\n \n***************** ******************************\nFor more information please contact Bob But era [rbutera@lps.umd.edu] or Jimmy Williams [jwilliams@physics.umd.edu].\nN ote: LPS is located at 8050 Greenmead Drive in College Park. There is parki ng at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the phone on the left hand side of the front door to call the receptionist for entry. LAST-MODIFIED:20171204T181001Z LOCATION:LPS Downstairs Conference Room SEQUENCE:2 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170511T163000Z DTEND:20170511T173000Z DTSTAMP:20260828T094430Z UID:9ku1mgk4jl2cqsepb08ga67hoo@google.com CREATED:20170508T130610Z DESCRIPTION:PHYS 798E and ENEE 698D\n\nTitle: A liquid sodium model of the Earth's core\nSpeaker: Prof. Dan Lathrop \, Physics and Geology\, U of Md.\ n\nAbstract: We have constructed a three meter liquid sodium model of the E arth's core. It is a spherical Couette experiment (differential rotation be tween inner and outer spheres). The experiment is geometrically similar wi th the earth's core. We study hydrodynamic and hydromagnetic phenomena in r apidly rotating turbulence\, as well as magnetic field induction by those f lows.\n\nBio: Professor Daniel Lathrop received a B.A. in physics from the University of California at Berkeley in 1987\, and a Ph.D. in physics from the University of Texas at Austin in 1991. He then served at Yale Universi ty as a postdoctoral fellow\, research affiliate\, and lecturer\, and as As sistant Professor at Emory University. He joined the University of Marylan d in 1997\, the year he received a Presidential Early Career Award from the National Science Foundation. Daniel Lathrop is now Professor of Physics a nd Professor of Geology and a Fellow of the American Physical Society. His research in the Nonlinear Dynamics group at Maryland focuses on turbulent fluid flows\, geomagnetism\, electronic reservoir computers\, and experimen ts on superfluid helium. Dr. Lathrop served as the Director of the Institu te for Research in Electronics and Applied Physics from 2006 to 2012. He r eceived the Stanley Corrsin Award in 2012 from the American Physical Societ y for this work in quantum fluids. LAST-MODIFIED:20170508T130610Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170914T190000Z DTEND:20170914T200000Z DTSTAMP:20260828T094430Z UID:222jj06n58njmjuajfl9ekma0o@google.com CREATED:20170907T141051Z DESCRIPTION:Speaker: Dr. Jen-Tsung Hsiang \n\nSpeaker Institution: Fudan Un iversity and Academia Sinica\n\nTitle: An exploration into quantum thermody namics - from the open-system perspective\n\nAbstract: We take the perspect ive of open quantum systems and examine from their nonequilibrium dynamics the conditions when the physical quantities\, their relations and the laws of thermodynamics become well defined and viable for quantum many body syst ems. We first highlight issues and ambiguities in QTD when the interaction between the system of interest and the environment is strong. Then we use the example of N strongly coupled harmonic oscillators\, interacting strong ly with a scalar field environment to illustrate these issues in the contex t of the internal energy\, heat capacity\, and the Third Law.\n\nDr. Hsiang is visiting MCFP for the month of September. \nContact person: Dr. B . L. Hu blhu@umd.edu LAST-MODIFIED:20170907T141051Z LOCATION:ATL 4301 (Olver Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Thermodynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160720T150000Z DTEND:20160720T160000Z DTSTAMP:20260828T094430Z UID:f8lspdspo5g7roi8943aebd1c8@google.com CREATED:20160524T140657Z DESCRIPTION:Speaker: Dominic Berry\n\nSpeaker Affiliation: Macquarie Univer sity\n\nTitle: Corrections for more accurate Hamiltonian simulation\n\nAbst ract: Hamiltonian simulation is a very promising area of quantum algorithms where quantum computers can provide a dramatic speedup over classical comp uters. Until recently\, all algorithms had poor scaling in the allowable e rror. New algorithms allow for complexity scaling logarithmically in the a llowable error. One is based on implementing a Taylor series\, and another is based on a superposition of different numbers of steps of a quantum wal k. These algorithms are still somewhat suboptimal because the complexity h as a multiplying factor that is logarithmic in the allowable error\, wherea s the lower bound has an additive factor. We have now developed general wa ys of correcting these algorithms\, eliminating the multiplying factor\, an d giving an additive factor that is similar to the lower bound up to double -logarithmic factors. LAST-MODIFIED:20160711T133355Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180227T181500Z DTEND:20180227T191500Z DTSTAMP:20260828T094430Z UID:0cabvcm8iqcfc3cbap5ilrlouf@google.com CREATED:20180221T132941Z DESCRIPTION:Speaker: Professor Ronald Levy\, Temple University


Title: Exploring Fitness and Free Energy Landscapes of Prot eins\, Part l: Statistical Models of Sequence Co-Variation


Abstract: \;The first talk in this two part series will re view recent work in my lab concerning the construction and analysis of fitn ess and free energy landscapes of proteins\, focusing mostly on sequence ba sed approaches. I will describe the Potts Hamiltonian statistical model of sequence co-variation\, and how we are using it to study the acquisition of drug resistance in HIV proteins\, and epistasis. The likelihood of a mutat ion at one position in a genome depends on the pattern of mutations at all the other positions. This phenomenon is called epistasis\, and it is respon sible for the "entrenchment" of drug resistance mutations when a sufficient number of background mutations accumulate in the genome. I will also talk about our efforts to map the conformational free energy landscape of kinase family proteins\, using the Potts model to infer sequence probabilities an d their structural propensities\, and to connect this information to confor mational free energy simulations in structure space. \; LAST-MODIFIED:20180221T132941Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180228T160000Z DTEND:20180228T170000Z DTSTAMP:20260828T094430Z UID:5mq6l9sjems5jei59cki6am07q@google.com CREATED:20180221T153043Z DESCRIPTION:Speaker: Professor Ronald M. Levy\, Temple University\, Cent er for Biophysics and Computational Biology\, Dept. of Chemistry


Title: Exploring Fitness and Free Energy Landscapes of Prote ins\, Part 2: Protein-Ligand Binding and Solvation at the Interface


Abstract: \;The second talk in this two part seri es will review recent work in my lab concerning molecular dynamics free ene rgy simulations of protein-ligand binding and the statistical thermodynamic s of solvation at the interface. I will discuss modeling protein-ligand bin ding at different levels of resolution with different solvation models\, fr om implicit to explicit. I will discuss two alternative perspectives for pr edicting the effects on binding affinity of displacing structured waters at protein receptor binding sites when ligands bind: inhomogeneous solvation theory\, and end-point density functional theory. I will try to address the question\, “What can statistical mechanics contribute to the drug design p rocess?” LAST-MODIFIED:20180221T153043Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171128T181500Z DTEND:20171128T191500Z DTSTAMP:20260828T094430Z UID:3k84p1ha70djsdtl6hm80ruhs4@google.com CREATED:20171127T133049Z LAST-MODIFIED:20171127T133049Z LOCATION:1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180920T180000Z DTEND:20180920T193000Z DTSTAMP:20260828T094430Z UID:3g2c7tjevk4gbm5st8aru4pesl@google.com CREATED:20180823T192954Z DESCRIPTION:\nTitle: Interface-Engineering and Emergent Quantum Phenomena i n Oxide Heterostructures\n\n\nSpeaker: T. Venky Venkatesan\, National Unive rsity of Singapore \n\nAbstract:\nComplex oxide interfaces have mesmerized the scientific community in the last decade due to the possibility of creat ing tunable novel multifunctionalities\, which are possible owing to the st rong interaction among charge\, spin\, orbital and structural degrees of fr eedom. Artificial interfacial modifications\, which include defects\, forma l polarization\, structural symmetry breaking and interlayer interaction\, have led to novel properties in various complex oxide heterostructures. The se emergent phenomena not only serve as a platform for investigating strong electronic correlations in low-dimensional systems\, but also provide pote ntial for exploring next-generation electronic devices with high functional ity. This talk reviews some recently developed strategies in engineering fu nctional oxide interfaces and their emergent properties.\n\nHost: Paglione/ Greene\nRefreshments Served at 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20180914T150308Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Venky Venkatesan\, National University of Singapor e TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170518T163000Z DTEND:20170518T173000Z DTSTAMP:20260828T094430Z UID:vctdah4qdshidr1krfjv6cu4u8@google.com CREATED:20170502T135637Z DESCRIPTION:Speaker Name: Tomoo Yokoyama\n\nSpeaker Institution : Kyoto Uni versity of Education\n\nTitle : Topological methods for analyzing two dimen sional flows\n\nAbstract: We introduce tree representations of two dimensio nal flows. Applying the topological methods to an evolution of an incompres sible and viscid flow around an inclined flat plate placed in a uniform flo w\, we can estimate when the lift-to-drag ratios of the plate are maximal a nd can determine transient streamline patterns between structurally\nstable streamline patterns. Moreover\, we state the possibilities of analyzing oc ean phenomena and medical phenomena. Finally\, we discuss low-dimensional d ynamical systems which are theoretical backgrounds of the methods.\n\n----\ nPizza will not be provided at this seminar LAST-MODIFIED:20170502T135637Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180831T170000Z DTEND:20180831T180000Z DTSTAMP:20260828T094430Z UID:3ea349prj8ok3ctuej91oq07q8@google.com CREATED:20180821T143010Z DESCRIPTION:Speaker: Alexander Roytburd\, MSE Prof Emeritus\, UMD

Title: Past and Future of Elastic Doman


Abstr act: \; \;https://mse .umd.edu/events/seminars





 LAST-MODIFIED:20180823T123929Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181010T150000Z DTEND:20181010T160000Z DTSTAMP:20260828T094430Z UID:6rj5rqeekg14m762ncur2qm97r@google.com CREATED:20180905T134544Z DESCRIPTION:Speaker: Haoran Qu\, Graduate Student Literature Seminar\, U MCP

Title: TBA LAST-MODIFIED:20180905T135313Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160715T200000Z DTEND:20160715T210000Z DTSTAMP:20260828T094430Z UID:qhql4at58p3asn8ptjk68gt610@google.com CLASS:PUBLIC CREATED:20160708T130504Z DESCRIPTION:Speaker: Wade DeGottardi\n\nInstitution: JQI\n\nLocation and Ti me: PSC 2136 at 4:00pm\n\nTitle: Introduction to Topological Quantum Comput ation\n\nAbstract: I will present a pedagogical introduction to topological quantum computation. I will discuss how topologically ordered materials ca n solve the quantum memory problem and can serve as a platform for fault-to lerant quantum computation. I will discuss several candidate systems includ ing superconductors which exhibit Majorana fermions.\n\n(The JQI summer sch ool is for students and postdocs\, but others are welcome to join for refre shments afterwards\; Discussion with pizza and refreshments at 5:00pm)\n\nH ost: Stephen Ragole LAST-MODIFIED:20160708T130504Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170920T190000Z DTEND:20170920T200000Z DTSTAMP:20260828T094430Z UID:2d3362a6falfqgmqosul4msal5@google.com CREATED:20170918T183403Z DESCRIPTION:Prof. Ian Applebaum\n\nTitle: Spin Physics in the Elemental Sem iconductors Si\, Ge\, P\, and Te\n\nAbstract: Although two-valued spin is a remarkable quantum property of all electrons\, it typically plays no obvio us role in the near-equilibrium charge transport physics within nonmagnetic materials. I will discuss some results from our experimental work with the technologically-dominant group-IV elemental semiconductors silicon (Si) an d germanium (Ge)\, where the effects of an externally-injected non-equilibr ium imbalance\, or spin polarization\, are made dominant by an unusual devi ce configuration. Building upon the understanding of spin-orbit interaction and spin relaxation gained from this experimental endeavor with three-dime nsional semiconductors\, I will show how the electronic structure of the va lence band in two-dimensional group-V phosphorene (P) can be exploited to m inimize the most important spin-flip pathway. In recent work\, we focus on our new discovery of an intrinsic 2D band on pristine surfaces of group-VI tellurium (Te)\, and the consequences of inversion symmetry-breaking in the bulk for spin transport phenomena. LAST-MODIFIED:20170918T183403Z LOCATION: LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171019T180000Z DTEND:20171019T193000Z DTSTAMP:20260828T094430Z UID:0em1qu0q9o407uj2jr08f9mfu4@google.com CREATED:20170908T202621Z DESCRIPTION:SPEAKER: Chris Richardson\, Laboratory for Physical Sciences\n \nTitle: Structure first approach to superconducting materials development\ n\nAbstract: Elemental superconductors are generally forgiving of modest co ncentrations of chemical impurities and insensitive to microstructure. How ever\, superconducting quantum circuits have shown that the superconducting loss tangent is sensitive to some aspects of material synthesis and device fabrication. \n\nThis material focused seminar will explore some of these aspects using high-purity\, single-crystal\, thin-film aluminum grown via m olecular beam epitaxy on silicon substrates. The metamorphic Al-Si interfa ce is characterized by x-ray diffraction and scanning transmission electron microscopy\, and found to have an abrupt interface that results in crystal relaxation within a few monolayers of the substrate interface and no measu rable interfacial layers. Molecular Dynamic Simulations predict complete s train relaxation through a primary and secondary dislocation interface netw ork that are experimentally verified. Quarter-wave coplanar waveguide reso nators are fabricated and characterization below 150mK demonstrate correlat ions between aluminum structure and resonator performance and internal qual ity factors near 1x10^6". Quantum device implications of various structura l observations will also be discussed.\n\nHOST: Fred Wellstood LAST-MODIFIED:20171006T192324Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Chris Richardson\, Laboratory for Physical Science s TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160520T161500Z DTEND:20160520T171500Z DTSTAMP:20260828T094430Z UID:rsdoi6id1lke9ipltfcg013v3o@google.com CREATED:20160513T152710Z DESCRIPTION:Speaker: Francesco Scazza\n\nSpeaker Affiliation: INO-CNR and L ENS - University of Florence (Italy)\n\n(Free lunch served at 12:00)\n\nTit le: Evidence for ferromagnetic instability in a repulsive Fermi gas of ultr acold atoms\n\nAbstract: The fine control of interactions and optical trapp ing potentials in ultracold atomic ensembles provides unique opportunities to explore strongly correlated fermion phenomena\, such as superfluidity an d magnetism. In our experiment\, we produce lithium-6 degenerate Fermi gase s in the vicinity of a broad Feshbach resonance [1] and we subsequently sup erimpose to the samples a thin repulsive optical barrier. This technique en abled the study of the Josephson dynamics of fermionic superfluids flowing through an insulating barrier\, spanning a wide range of interaction streng ths across the BEC-BCS crossover [2]. More recently\, by preparing two adja cent and fully spin-polarised domains at rest\, we were able to study the m agnetic properties of a repulsively interacting Fermi gas on the many-body upper energy branch. I'll report on the investigation of collective spin mo des in this system and of the stability of the initial fully-polarized stat e. Diffusion measurements of the two approaching spin clouds reveal the tem porary suppression of spin conductance above a critical interaction strengt h\, closely connected to the concomitant observation of a spin-dipole mode softening\, which points to the occurrence of a ferromagnetic instability. \n\n\n[1] Burchianti\, A. et al.\, Efficient all-optical production of larg e 6Li quantum gases using D1 gray-molasses cooling. Phys. Rev. A 90\, 04340 8 (2014)\n[2] Valtolina\, G. et al.\, Josephson effect in fermionic superfl uids across the BEC-BCS crossover. Science 350\, 1505 (2015)\n LAST-MODIFIED:20160513T152710Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170511T223000Z DTEND:20170511T233000Z DTSTAMP:20260828T094430Z UID:n8theqja4nui2o280lj2o8gcc0@google.com CREATED:20170213T160726Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\n\nTentative schedule:\n\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Pro f. Steve FetterThe Day After Trinity\nMar 16Dr. Eric DennaThe Imitation Gam e\nMar 30Prof. James GatesThe Day The Earth Stood Still\nApr 13Prof. Juan U riagerekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill DorlandChina Syndrome\n LAST-MODIFIED:20170309T192929Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: China Syndrome TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161026T200000Z DTEND:20161026T210000Z DTSTAMP:20260828T094430Z UID:bsluun0fo1j2b04q9cd8a0vd80@google.com CREATED:20161021T152559Z DESCRIPTION:Speaker Name: Tulika Bose\n\nSpeaker Institution : Boston Unive rsity\n\nRecent Results from Exotic Searches at the CMS Experiment\n\nAbstr act: The LHC re-started last year at an unprecedented center of mass energ y of 13 TeV and the CMS experiment has already successfully collected more than ~30 fb( -1) data this year. In this talk\, I will review recent search es for exotic physics with special focus on final state topologies with hea vy standard model particles. This includes searches for diboson resonances\ , vector-like quarks and resonances with top quarks. LAST-MODIFIED:20161021T152711Z LOCATION:PSC Room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170210T180000Z DTEND:20170210T190000Z DTSTAMP:20260828T094430Z UID:dthau9mlu8jjbo7muuep15ag2k@google.com CREATED:20170126T193735Z DESCRIPTION:Speaker Name: K.T. Ramesh\, Professor\n\nSpeaker Institution: J ohn Hopkins University\n\nTitle: The Mechanical Behavior of Asteroidal Mate rials\n\nAbstract:Most Near-Earth asteroids (NEAs) are rocky\, with composi tions similar to meteorites. The mechanical behavior of asteroidal material s is a critical aspect of many important questions. What is the likely stre ngth of an incoming asteroid? What will it take to disrupt such an asteroid ? What is the potential for asteroid mining\, and what would an asteroid pr ospector seek? What will we find on the surface of an asteroid if we were t o land on one (the NASA OSIRIS-REx mission seeks to do this in 2019)? Our s pacecraft have shown that most asteroids appear to be covered by a loose la yer of rocky material called the regolith. The presence of regolith on such airless bodies has been attributed to impact ejecta re-accumulation and gr adual breakdown of boulders by micrometeorite impacts. However\, ejecta vel ocities for these small kilometer-sized asteroids often exceed the gravitat ional escape velocity. What then is the source of the surface layer of rock s? This is an important question both for manned missions to the asteroids and for prospective asteroid mining operations.We examine the mechanical be havior of asteroidal materials by studying the quasistatic and dynamic mech anical properties of meteorites using traditional experiments\, nanoindenta tion\, impact\, high-strain-rate and thermal fatigue experiments. We couple these experiments with analytical and computational studies of failure pro cesses in the extreme environments associated with near Earth asteroids. Ou r focus is on the relative roles of impact and thermal loading on the natur e of asteroids that may potentially impact the Earth. We examine the main l ength and timescales involved in the mechanical degradation of asteroidal m aterials\, and then develop simple scaling laws to estimate the strengths a nd the time required for thermal fatigue-induced rock breakdown. Finally\, we consider the implications of our work for the lifetimes of these asteroi ds\, for asteroid mining operations\, and mitigating the potential impact h azard on the Earth. LAST-MODIFIED:20170126T193735Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170509T130000Z DTEND:20170509T213000Z DTSTAMP:20260828T094430Z UID:9m84155p1n0feqka72bahvl2ak@google.com CREATED:20170508T195544Z DESCRIPTION:Symposium Schedule\n\n09:00-09:30 am: Refreshments and i ntroductory remarks\n\n09:30-10:10 am: Clare Waterman (NIH)\, Actin retrograde flow actively aligns and orients ligand-enhanced integrins in fo cal adhesions\n\n10:10-10:30 am: Wolfgang Losert (UMD)\, Physical gu idance of cell migration\n\n10:30-10:50 am: Break\n\n10:50-11:30 am: Doug Robinson (JHU)\, Cellular form: the basis of healthy function\ n\n11:30-12:10 pm: Paul Janmey (U Penn)\, Compression stiffening of tissues and cells: protective role of intermediate filaments\n\n12:10-01:50 pm: Lunch & poster session\n\n01:50-02:30 pm: Dan Fletcher ( Berkeley)\, Vive la resistance! What the actin cytoskeleton teaches us abou t force\n\n02:30-02:50 pm: Arpita Upadhyaya (UMD)\, Harnessing the f orce: mechanical modulation of immune cell dynamics\n\n02:50-03:20 pm: Break & Posters\n\n03:20-03:40 pm: Garyk Papoian (UMD)\, Understa nding the emergence of contractility in actomyosin networks\n\n03:40-04:20 pm: Fred Mackintosh (Rice)\, Mechanical phase transitions and the el asticity of intra- and extracellular matrices\n\n04:20-05:00 pm: Jon athan Howard (Yale)\, Microtubules\, motors and morphogenesis \n\n05:00-05: 30 pm: Reception\n\n\nAttached please find a visitor parking map\, c ampus map\, and symposium schedule. A full interactive map is available her e: http://maps.umd.edu/map/. \n\nIf you are coming by the Metro\, please ge t off at the College Park/UMD stop on the Green line. When you exit the sta tion\, go up the stairs on the left. Take the Campus Metro Shuttle #104. Ge t off at the Student Union and walk a couple of minutes from there to the s ymposium venue. \n LAST-MODIFIED:20170508T195703Z LOCATION:Room 1103 Biosciences Research Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160427T150000Z DTEND:20160427T160000Z DTSTAMP:20260828T094430Z UID:rbt51qosbas2slirge5tgqamh8@google.com CREATED:20160418T135904Z DESCRIPTION:Speaker: Rex Lundgren \n\nSpeaker Affiliation: University of Te xas at Austin\n\nTitle: Momentum-Space Entanglement in Quantum Spin Chains\ n\nAbstract: The momentum-space entanglement properties of several quantum spin chains are investigated. More specifically\, we study the entanglement spectra\, i.e. the set of eigenvalues of the reduced density matrix\, betw een left-and right-moving particles in bosonic and fermionic formulations o f quantum spin chains. We elaborate on how momentum-space entanglement spec tra may support the numerical study of phase transitions and classify certa in critical systems. We also investigate the momentum-space entanglement sp ectrum after a quantum quench and show that the momentum-space entanglement spectrum of the XXZ spin-half chain possesses many universal features both in equilibrium and after a quantum quench. \n\nReferences: Phys. Rev. Lett . 113\, 256404 (2014)\, arXiv:1512.09030\, arXiv:1603.01997\n LAST-MODIFIED:20160418T135904Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160708T200000Z DTEND:20160708T210000Z DTSTAMP:20260828T094430Z UID:fvb17ckqqcgbttu3gb9alb6spk@google.com CLASS:PUBLIC CREATED:20160630T121942Z DESCRIPTION:\nSpeaker: Xiaopeng Li\n\nInstitution: JQI/CMTC\n\n(The JQI sum mer school is for graduate students and postdocs\, but others are welcome t o join for refreshments afterwards\; Discussion with pizza and refreshments at 5:00pm)\n\nTitle: An Introduction to Many-Body Localization\n\nAbstract : Many-body localization has recently attracted tremendous research attenti ons from both AMO and condensed matter communities. Such fundamental questi ons in quantum statistical physics as when and how a disordered quantum sys tem thermalizes are revitalized. In this lecture\, I will start from Anders on localization of single-particle states\, and describes how the concept o f localization generalizes to Many-body localization\, explaining the main differences of interacting and non-interacting systems. The theory of local integral of motion for many-body localization will be discussed. In the en d I will give a brief review about the present experimental status and outl ine my view (biased) for future directions. LAST-MODIFIED:20160630T121942Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180423T110000 DTEND;TZID=America/New_York:20180423T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180423T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: \;Manfred Bayer

Affiliation: E xperimentelle Physik 2\, TU Dortmund\, D-44221 Dortmund\, Germany

Ti tle: \;Rydb erg excitons in cuprous oxide

Abstract: \;Excitons determin e the optical properties of semiconductors and insulators. Their descriptio n as hydrogen atom-like complexes has turned out to be an extremely success ful concept. In Rydberg atoms an electron is promoted into a state with hig h principal quantum number. Thereby the atom becomes a mesoscopic quantum o bject with dimensions up to the micrometer-range. Recently it was shown tha t also an exciton can be highly excited by observing states with principal quantum numbers up to n=25 in natural cuprous oxide crystals. This correspo nds to an average radius of the wave function of more than 1 \;< span style="color: rgb(34\, 34\, 34)\; font-family: arial\, sans-serif\; fo nt-size: small\; background-color: rgb(255\, 255\, 255)\;">μm so that the exciton covers more than 10 billion crystal unit cells. In this contrib ution I will address the behavior of these excitons when exposed to strong electric or magnetic fields\, and compare this behavior to atoms. Rydberg e xcitons exhibit also giant interactions with other excitations in the cryst al. An example is the giant exciton-exciton interaction\, leading to the Ry dberg blockade where the presence of one Rydberg exciton blocks the excitat ion of another one in its vicinity. The efficiency of this blockade scales with the 10-th power of the principal quantum number. Another example is th e interaction with a low-density electron-hole plasma. Here the Mott transi tions from an insulating to a metallic phase can be studied with unpreceden ted accuracy: while the band gap energy becomes renormalized by the plasma\ , the exciton energies surprisingly remain unaffected with micro-eV resolut ion. LAST-MODIFIED:20180329T112307Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171116T190000Z DTEND:20171116T203000Z DTSTAMP:20260828T094430Z UID:7839leip5jh7prfm0uoo7nrjmh@google.com CREATED:20170908T210612Z DESCRIPTION:SPEAKER: Vlad Pribiag\, University of Minnesota\n\nTITLE: Magne tism and superconductivity in MBE-grown SrTiO3-based heterostructures\n\nAB STRACT: Complex oxide interfaces are a promising platform for studying a wi de array of correlated electron phenomena in low-dimensions\, including mag netism and superconductivity. The microscopic origin of these phenomena in oxide interfaces remains an open question. The majority of the work on oxid e interfaces has so far been performed on LaAlO3/SrTiO3 films deposited by pulsed-laser deposition (PLD). Here\, I will discuss our low-temperature el ectronic transport studies of NdTiO3/SrTiO3 and SrTiO3 thin films grown by molecular beam epitaxy (MBE). The magnetoresistance (MR) of NdTiO3/SrTiO3 r eveals signatures of spin-dependent transport in the presence of emergent l ocal ferromagnetic order. Spin-dependent transport becomes dominant over ot her transport mechanisms at temperatures below ~4 Kelvin. [arXiv:1704.0882] Interestingly\, the MR also shows transient hysteretic features with a cha racteristic timescale of ~100 seconds. I will show that these transient fea tures\, which can appear to originate from magnetization reversal\, are in fact consistent with an extrinsic origin. I will discuss the importance of time-dependent measurements for distinguishing signatures of magnetism from other effects that can produce hysteretic MR in low-temperature experiment s. I will conclude with our current efforts to explore superconductivity in NdTiO3/SrTiO3 and doped SrTiO3 thin films.\n\nHOSTS: J.Paglione & J.Willia ms LAST-MODIFIED:20171112T234003Z LOCATION:Room 1201 Toll SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Vlad Pribiag\, University of Minnesota TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180206T181500Z DTEND:20180206T191500Z DTSTAMP:20260828T094430Z UID:5p78kjol2ivjq555epnh6g06uj@google.com CREATED:20180201T133921Z DESCRIPTION:Speaker: Professor Edina Rosta\, King's College\, London

Title: Coarse Graining and Molecular Kinetics from Biased Si mulations

Abstract: \; Rosta abstract Important biologica l processes taking place on the millisecond to second time scales are too s low to model using unbiased atomistic simulations. To obtain free energy pr ofiles on long time scales\, enhanced sampling methods have been developed. We show that novel Markov modelling-based tools can be used to analyse bia sed and unbiased simulations. Using our dynamic weighted histogram analysis method (DHAM)\, systematic errors due to insufficient global convergence c an be corrected [1]. In addition\, DHAM also provides direct kinetic inform ation on the conformational transitions intrinsic to the system. We also de monstrate that a variationally optimal kinetic coarse graining allows us to obtain Markov models\, where not only metastable\, but also transition sta tes can be automatically identified [2]. Applications include analysis of m olecular dynamics simulations of RAF kinases [3] and umbrella sampling quan tum classical QM/MM simulations of catalytic reactions [4]. \;
[1] Rosta\, E. and Hummer\, G. (2015) Free Energies from Dynamic Weighted Histo gram Analysis Using Unbiased Markov State Model. J. Chem. Theory Comput.\, 11\, 276-285.

[2] Martini\, L.\; Kells\, A.\; Covino\, R.\; Humme r\, G.\; Buchete\, N-V.\; Rosta\, E. (2017) Variational identification of M arkovian transition states\, Phys. Rev. X\, doi: 10.1103/PhysRevX.7.031060.

[3] (a) Jambrina\, P. G.\; Bohuszewicz\, O.\; Buchete\, N. V.\; K olch\, W.\; Rosta\, E.\, Biochem. Soc. Trans. 2014\, 42 (4)\, 784-90\; (b) Jambrina\, P. G.\; Rauch\, N.\; Pilkington\, R.\; Rybakova\, K.\; Nguyen\, L. K.\; Kholodenko\, B. N.\; Buchete\, N.-V.\; Kolch\, W.\; Rosta\, E.\, An gewandte Chemie International Edition 2016\, 55 (3)\, 983-986.

[4] Suardiaz\, R.\; Jambrina\, P. G.\; Masgrau\, L.\; Gonzalez-Lafont\, A.\; R osta\, E.\; Lluch\, J. M.\, Understanding the Mechanism of the Hydrogen Abs traction from Arachidonic Acid Catalyzed by the Human Enzyme 15-Lipoxygenas e- 2. A Quantum Mechanics/Molecular Mechanics Free Energy Simulation. Journ al of Chemical Theory and Computation 2016. \; LAST-MODIFIED:20180201T134443Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161014T161500Z DTEND:20161014T171500Z DTSTAMP:20260828T094430Z UID:op1arh7gs3b2momn9r65ekv29c@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.op1arh7gs3b2mom n9r65ekv29c CREATED:20161005T145312Z DESCRIPTION:PSC 2136\, Friday\, October 14\, 2016 - 12:15pm (Free lunch se rved at 12:00pm)\n\nTitle: Nonlinear looped band structure of Bose-Einstein condensates in an optical lattice\n\nSpeaker Name: Elizabeth Goldschmidt \ n\nSpeaker Institution: US Army Research Laboratory\n\nAbstract: We study e xperimentally the stability of excited\, interacting states of bosons in a double-well optical lattice where the nonlinear interactions are expected t o induce "swallowtail" looped band structure. By experimentally preparing d ifferent initial coherent states and observing their subsequent decay\, we observe distinct decay rates in regimes where multi-valued looped band stru cture is expected. This qualitative agreement with a dynamic homogeneous Gr oss-Pitaevskii calculation is not\, however\, matched by a quantitative agr eement for the stability of the excited loop states. I will discuss potenti al explanations for this discrepancy and further work on this phenomenon.\n \nJoin with Google Hangouts: https://plus.google.com/hangouts/_/calendar/bG JrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.op1arh 7gs3b2momn9r65ekv29c?hs=121 LAST-MODIFIED:20161005T145312Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171027T201500Z DTEND:20171027T211500Z DTSTAMP:20260828T094430Z UID:6q22mu42fpjclujjr3e0sum572@google.com CREATED:20171019T124214Z DESCRIPTION:Speaker: Aaron Ostrander\n\nAffiliation: QuICS\n\nTitle: Quantu m Algorithm for Simulating the Wave Equation\n\nAbstract: We present a quan tum algorithm for simulating the wave equation. The algorithm uses Hamilton ian simulation and quantum linear system algorithms as subroutines. We use factorizations of discretized Laplacian operators to improve state preparat ion (relative to other algorithms) and scaling with respect to truncation e rrors. We will also consider using Hamiltonian simulation for Klein-Gordon equations and Maxwell’s equations.\nJoint work with Pedro Costa and Stephen Jordan\n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171019T124214Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170929T110000 DTEND;TZID=America/New_York:20170929T115000 RRULE:FREQ=WEEKLY;COUNT=8;BYDAY=FR EXDATE;TZID=America/New_York:20171117T110000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nFirst lecture: What is machine learning\, data science and deep lear ning? What can they do? Where did this come from? Where will they go? What tools will be required?\n\nCourse description: This short course covers the fundamentals of machine learning\, assuming the typical background and mot ives of a physicist. It's goal is to give those who attend an understanding of the field and its capabilities\, as well the tools to learn the necessa ry extensions of the topic to apply it to their physics research. Lectures will include introductions to Python\, Linux\, neural nets\, deep learning\ , natural language processing\, imagine recognition/computer vision\, and A I safety.\n\nRSVP for the first friday here: http://bit.ly/2xgpvDE\njustink terry@gmail.com LAST-MODIFIED:20170927T161803Z LOCATION:Edward St. John 2208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170918T190000Z DTEND:20170918T203000Z DTSTAMP:20260828T094430Z UID:3njqltcvpm1g2k9i2a3f1d9ult@google.com CREATED:20170914T145032Z DESCRIPTION:Speaker: Jack Collins\n\nSpeaker Institution: University of Mar yland\n\nTitle: Searching for new physics in jets at the LHC\n \nAbstract: New particles beyond the Standard Model might be produced with a very high boost\, for instance if they result from the decay of a heavier particle. I f the former decay hadronically\, then their signature is a single massive fat jet which is difficult to separate from QCD backgrounds. However\, in r ecent years jet substructure and machine learning techniques have been demo nstrated to be able to extract information that is useful for discriminatin g different kinds of jets. In this talk I will begin with a brief review of the state of the art in LHC searches for new physics in jets and of new ph ysics models which might manifest in this way. There remain gaps in the LHC search program\, and the main part of my talk will illustrate how these ga ps might be filled either by dedicated taggers designed to isolate specific jet substructures\, or by generic taggers designed to reject most QCD jets while having broad sensitivity to jets resulting from a range of BSM boost ed particles in as model-agnostic a way as possible. This would allow to se arch for new particles with various decay topologies as bumps in otherwise featureless jet mass distributions. LAST-MODIFIED:20170914T145032Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171130T190000Z DTEND:20171130T200000Z DTSTAMP:20260828T094430Z UID:650CFE1C-7064-45FE-8FC4-8EDCCE3B4C26 CREATED:20171123T155034Z DESCRIPTION:Title : Fast Radio Bursts\n\nSpeaker Name: Vicky Kaspi\n\nSpeak er Institution : McGill University\n\nAbstract : Fast Radio Bursts (FRBs) a re a newly discovered astrophysical phenomenon consisting of short (few ms) bursts of radio waves. FRBs occur roughly 1000 times per sky per day. From their dispersion measures\, these events are clearly extragalactic and pos sibly generally at cosmological distances. One FRB is known to repeat and i ndeed has been localized to a dwarf galaxy at redshift 0.2. Nevertheless\, the origin of FRBs\, whether repeating or not\, is presently unknown. In th is talk I will review FRB properties as well as highlight efforts to find F RBs\, including a new Canadian radio telescope\, CHIME\, that is predicted to make major progress on the FRB problem. LAST-MODIFIED:20171123T155054Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space Science Institute\, Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170316T223000Z DTEND:20170316T233000Z DTSTAMP:20260828T094430Z UID:aa5sci9mblf2ikhodrubha5k4k@google.com CREATED:20170213T160428Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\nTentative schedule:\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Prof. S teve FetterThe Day After Trinity\nMar 16Dr. Eric DennaThe Imitation Game\nM ar 30Prof. James GatesThe Day The Earth Stood Still\nApr 13Prof. Juan Uriag erekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill Dor landChina Syndrome\n LAST-MODIFIED:20170309T221218Z LOCATION:PSC Lobby SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: The Imitation Game TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170406T163000Z DTEND:20170406T173000Z DTSTAMP:20260828T094430Z UID:lao93ivd443kq7sk2i6b200ifg@google.com CREATED:20170127T153336Z DESCRIPTION:Speaker Name: Daniel Butts\n\nSpeaker Institution : Department of Biology - University of Maryland\n\nTitle : Why Have Network Modulatio n of Sensory Cortex that Causes Variability to Sensory Processing?\n\nAbstr act: A fundamental goal in brain research is to understand how electrical a ctivity of individual neurons represents information relevant for brain fun ction. This is most often studied in sensory systems\, where neural activit y can be directly related to sensory stimuli that can be experimentally con trolled. However\, recordings in awake animals can reveal an enormous amoun t to variability — that is\, different responses to the same stimuli. Such variability has traditionally been characterized as noise that imposes limi ts on sensory processing. However\, with experimental technology allowing f or access to large amounts of simultaneously recorded neurons\, it is becom ing clear that this noise is shared and purposeful\, and likely relates to a larger view of the function of sensory cortex. My lab has been developing new methods for analyzing population activity (and its dynamics) to infer what information is being represented by this variability\, and how it rela tes to the larger functions of sensory cortex. This points to a picture whe re sensory processing does not occur in a vacuum\, but is implicitly tied t o the behavioral and motivational context of the animal. LAST-MODIFIED:20170223T153912Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170828T190000Z DTEND:20170828T203000Z DTSTAMP:20260828T094430Z UID:2pvde753diot4akn36pnkae7qg@google.com CREATED:20170822T134416Z DESCRIPTION:Speaker: Alexander Ridgway\n\nSpeaker Institution: CalTech\n\nT itle: Gravitational Radiation from Yang-Mills\n\nAbstract: We construct per turbative classical solutions of the Yang-Mills equations coupled to dynami cal point particles carrying color charge. By applying a set of color to ki nematics replacement rules first introduced by Bern\, Carrasco and Johansso n (BCJ)\, these are shown to generate solutions of d-dimensional dilaton gr avity\, which we also explicitly construct. Agreement between the gravity r esult and the gauge theory double copy implies a correspondence between non -Abelian particles and gravitating sources with dilaton charge. When the co lor sources are highly relativistic\, dilaton exchange decouples\, and the solutions we obtain match those of pure gravity. We comment on possible imp lications of our findings to the calculation of gravitational waveforms in astrophysical black hole collisions\, directly from computationally simpler gluon radiation in Yang-Mills theory. LAST-MODIFIED:20170822T153629Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180905T150000Z DTEND:20180905T160000Z DTSTAMP:20260828T094430Z UID:428n96j6akgt1vkj49kn4eertc@google.com CREATED:20180827T140238Z DESCRIPTION:Speaker: Professor Edo Waks\, UMCP\, Electrical and Computer En gineering\n\nTitle: Quantum Nanophotonics: Controlling Photons with Spin on a Semiconductor Chip\n\nAbstract: Interactions between light and matter li e at the heart of optical communication and information technology. Nanopho tonic devices enhance light-matter interactions by confining photons to sma ll mode volumes\, enabling optical information processing at low energies. In the strong coupling regime these interactions are sufficiently large to achieve a nonlinear response with a single photon. Such single-photon nonli nearities are highly desirable for photonic quantum information where atoms mediate interactions between photonic qubits. In this talk I will describe our effort to develop and coherently control quantum dots strongly coupled to photonic crystals. Quantum dots are semiconductor “artificial atoms” th at can act as efficient photon emitters and quantum memories. By embedding them in a photonic crystal cavity that spatially confines photons to less t han a cubic wavelength\, we can attain the strong coupling regime. I will d iscuss how we can exploit this regime to achieve a quantum transistor\, whe re a single spin trapped in the quantum dot can flip a photon polarization and a single photon can flip the spin-state\, realizing a fundamental quant um interaction. I will then describe how this device can implement a single photon transistor\, where a single photon can switch an optical signal com posed of as many as 30 photons. Finally\, I will discuss our approach to sc ale these devices to larger systems and couple them to novel photonic struc tures exhibiting topological properties. LAST-MODIFIED:20180830T153912Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PChem/ANE/ChemPhys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170811T200000Z DTEND:20170811T210000Z DTSTAMP:20260828T094430Z UID:1b9n34l4vk380me7ml0sd8880e@google.com CREATED:20170803T152739Z DESCRIPTION:Speaker: Jim Garrison\n\nInstitution: JQI/QuICS\n\nTitle: Entan glement in many-body quantum systems\n\nAbstract:\nA system's entanglement structure can provide deep insights into a quantum phase of matter. After introducing the von Neumann entanglement entropy\, I will discuss area laws and their violations in the ground states of quantum many-body systems\, f ocusing on rigorously-proven results as well as simple examples which can g uide intuition. I also plan to introduce a generalization of the von Neuma nn entropy known as the Renyi entropy\, after which I will discuss its spec ial applications in analytics\, numerics\, and experimental protocols for m easuring entanglement. Time permitting\, I will give a brief introduction to matrix product state methods and discuss their role in simulating 1D sys tems with low entanglement.\n\n(The JQI summer school is for students and p ostdocs\, but others are welcome to join for refreshments and snacks afterw ard\; Discussion with refreshments and snacks at 5:00 pm) LAST-MODIFIED:20170803T152739Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170310T180000Z DTEND:20170310T190000Z DTSTAMP:20260828T094430Z UID:octvgccs1lvdmbj00r85r3apus@google.com CREATED:20170123T201904Z DESCRIPTION:Speaker Name: Richard Weiss\, Professor\, Dept of Chemistry & Institute for Soft Matter Synthesis and Metrology\n\nInstitution: Georgetow n U.\n\nTitle: Hard and Soft Matter in Conservation Science: How Did I Get Here?\n\nAbstract: Aspects of 3 current projects dealing with conservation science\, as well as a very brief history of how the speaker became involve d with this field\, will be discussed -\n\nTwo PEG-based surfactants\, C12E 9 and C18E100\, have been incorporated into 80% hydrolyzed poly(vinyl aceta te)–borate gel-like aqueous dispersions with no deleterious effects on the stability\, workability\, or optical properties of the materials. The dispe rsions are clear\, peelable\, and stable at room temperature (in capped via ls to prevent evaporation) for more than two months. Perhaps as a result of its gentler physical action and less swelling of the paint\, gel cleaning of artificial soil-coated acrylic paint appears to cause less disruption to the acrylic paint surface than swabbing. \nThe removal of soluble salts is an essential step in preservation of materials of historical interest\, su ch as clays\, pottery\, and plaster because desalination minimizes the dama ge caused by salt recrystallization. Using water for desalination of water- sensitive paints is extremely challenging—treatments can result in the remo val or destruction of the paint during removal of the salts from the sublay ers. We will describe conditions to remove salts from water-sensitive pain ted pottery surfaces using treatments that include the application of tempo rary consolidants to the painted areas.\nBecause some cleaning treatments r equire application of non-aqueous agents\, we are exploring the utility of organogels formed by combining 40% hydrolyzed poly(vinyl acetate) and benze ne-1\,4-diboronic acid in various organic liquids. Progress in assessing t he properties of these gels will be reported.\n\nFor additional info\, visi t://www.mse.umd.edu/events/seminars LAST-MODIFIED:20170126T194305Z LOCATION:2108 Chem/Nuc Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171116T140000Z DTEND:20171116T172000Z DTSTAMP:20260828T094430Z UID:1i4pag48elq4r3rvbbgvb30gnk@google.com CREATED:20171108T184928Z DESCRIPTION:MAGNETISM\n\n9:00 AMMike Schecter “Thermal Ising Transitions i n 2D Heisenberg Magnets”\n\n9:50 AMLance Boyer “A Model for Metastable Mag netism in the Hidden-Order Phase of URu2Si2”\n\nLATTICES\n\n10:40 AMDanny B ulmash “Fractons and Gapped Boundaries”\n\n11:30 AMShenglong Xu “Interact ion effects from the parity of N in SU(N) symmetric fermion lattice systems ”\n\n12:20-1:50 Lunch Break LAST-MODIFIED:20171108T185138Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171109T193000Z DTEND:20171109T210000Z DTSTAMP:20260828T094430Z UID:1dckdgsr5hpgnp1un0lbgfoeh4@google.com CREATED:20170831T160830Z DESCRIPTION:Speaker: Johannes Kirscher\n\nSpeaker Institution: City College of New York\n\nTitle: A Brunnian multi-neutron state\n\nAbstract: Nuclei\, composed entirely of neutrons\, are an unsolved\nproblem for theory and ex periment. I will present a\nconjecture about the existence of such a bound\ , pure\nneutron core whose characteristic is the absence of any\nbound subs tructure -- removal of an arbitrary number of\nneutrons from this core lead s to the disintegration of\nthe object in single\, free neutrons. As such t hey present\na generalization of the so-called Borromean structure\nas an e mergent property of the nuclear interaction in\nhelium-6. The conjecture is motivated\, in part\, by\nQCD simulations which find a bound di-neutron if the\nquark masses are detuned to larger-than-physical values.\nI will thus present the implications from the mechanism\nresponsible for the multi-neu tron bound state for the\nsearch for these objects in QCD simulations. LAST-MODIFIED:20171020T130238Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170118T160000Z DTEND:20170118T170000Z DTSTAMP:20260828T094430Z UID:mao7cl3ltb85digbothsqqdoi0@google.com CREATED:20170109T141045Z DESCRIPTION:Speaker: Maris Ozols\n\nSpeaker affiliation: University of Camb ridge\n\nTitle: Simulating large quantum circuits on a small quantum comput er\n\nAbstract: This talk will explore strategies for simulating large quan tum circuits on a classical computer that has access to a small quantum dev ice. We show that a quantum circuit\, represented by a tensor network\, can be cut into smaller pieces and each piece executed independently on a smal ler device by simulating contraction of the corresponding smaller tensor ne twork. Assuming a partition with not too many edges between different parts can be found\, we provide efficient algorithms for simulating such circuit s. While in general the simulation cost scales exponentially in the total n umber of edges between different parts\, the size of the quantum memory req uired scales only linearly in the degree of each part.\n\nThis talk is base d on joint work with:\n\nAram Harrow (MIT)\nTianyi Peng (Tsinghua Universit y)\nXiaodi Wu (University of Oregon) LAST-MODIFIED:20170109T141045Z LOCATION:3100A Atlantic Building (Computer and Space Science Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180924T190000Z DTEND:20180924T203000Z DTSTAMP:20260828T094430Z UID:79pgjrkce8vdnoc0sej8cqc7eu@google.com CREATED:20180912T201540Z DESCRIPTION:Title: Axion and hidden photon dark matter detection with multi layer optical haloscopes

Speaker: Junwu Huang\, Perimeter Institute< br>
Abstract: In this talk\, I will discuss a new class of detectors for dark photon and axion dark matter at frequencies from the infrared through the ultraviolet based on dielectric haloscopes and high precision and effi ciency single photon detectors.
A well-motivated class of dark matter c andidates including axions and dark photons takes the form of coherent osci llations of a light bosonic field. If the dark matter couples to Standard M odel states it may be possible to detect it via absorptions in a laboratory target. Current experiments of this kind include cavity-based resonators t hat convert bosonic dark matter to electromagnetic fields operating at micr owave frequencies. In periodic photonic materials\, bosonic dark matter can efficiently convert to detectable single photons. With feasible experiment al techniques\, these detectors can probe significant new parameter space f or axion and dark photon dark matter in the 0.1-10 eV mass range.
LAST-MODIFIED:20180912T201540Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171113T190000Z DTEND:20171113T200000Z DTSTAMP:20260828T094430Z UID:3eochs5eru0lqb98au5vvge534@google.com CREATED:20171018T151916Z DESCRIPTION:Protein conformational dynamics in recognition and catalysis: A lkB\, GCN4\, and Ribonuclease H\nSpeaker Name: Arthur Palmer\nSpeaker Insti tution : Columbia University\nNotes: http://www.marylandbiophysics.umd.edu/ seminars/\nAbstract : NMR spectroscopy and molecular dynamics (MD) simulati ons are powerful approaches for probing aspects of conformational dynamics in biological macromolecules. Methods that can be utilized to characterize dynamics on picosecond-nanosecond and on microsecond-millisecond time scale s will be illustrated by applications to the DNA-repair enzyme AlkB [1]\, t he enzyme ribonuclease H [2]\, and the yeast transcription factor GCN4 [3]. In the first example\, NMR spin-relaxation measurements establish that the equilibrium distribution of ordered and disordered conformations of the nu cleotide recognition element controls order of addition of substrates. In t he second example\, spin-relaxation measurements and MD simulations as a fu nction of temperature for proteins from psychrotrophic\, mesophilic\, and t hermophilic bacterial species characterize the coupling between conformatio nal dynamics\, stability\, and function. In the third example\, spin-relaxa tion measurements at five static magnetic fields and MD simulations lead to a two-step selected- and induced-fit mechanism of binding to DNA. Taken to gether\, these cases illustrate the importance of rare\, sparsely populated \, conformational states in protein function.\nsnejjar@umd.edu LAST-MODIFIED:20171018T151916Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180515T200000Z DTEND:20180515T213000Z DTSTAMP:20260828T094430Z UID:2rirmnhqb0mhb5qro4hftin34i@google.com CREATED:20180514T130853Z DESCRIPTION:\nSpeaker: Can Kilic\n\nSpeaker Institution: University of Texa s\n\nTitle: A Secret Asymmetry From Flavored Dark Matter\n\nAbstract: In th eories where dark matter has multiple flavors and where its coupling to Sta ndard Model particles is flavor-non-trivial\, I will explore a novel mechan ism for generating an asymmetry in the dark sector despite an unbroken glob al dark matter number symmetry. Focusing on two benchmark models incorporat ing this mechanism\, I will consider how standard experimental signatures a re affected in novel ways\, such as collider searches\, direct and indirect detection experiments\, and I will also explore the consequences for astro physical observables. LAST-MODIFIED:20180515T120358Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Canceled** EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161212T200000Z DTEND:20161212T213000Z DTSTAMP:20260828T094430Z UID:hgs2r8c2r9qkthukc1871197j8@google.com CREATED:20161121T143935Z DESCRIPTION:Speaker: Fabrizio Rompineve\n\nSpeaker Institution: Institute f or Theoretical Physics\, University Heidelberg\n\nTitle: Gravitational Wave s from Axion Monodromy\n \nAbstract: Large field inflation is arguably the simplest and most natural variant of slow-roll inflation. Axion monodromy m ay be the most promising framework for realising this scenario. In this set up\, the long-range polynomial potential possesses short-range\, instantoni c modulations. In this talk we will discuss how such modulations give rise to a series of local minima in the post-inflationary region of the potentia l. We will then argue that for certain parameter choices the inflaton popul ates more than one of these vacua inside a single Hubble patch. This corres ponds to a dynamical phase decomposition\, analogously to what happens in t he course of thermal first-order phase transitions. In the subsequent proce ss of bubble wall collisions\, the lowest-lying axionic minimum eventually takes over all space. The very interesting signature associated to this vio lent process is the radiation of gravitational waves. We will provide estim ates of the energy density and peak frequency of the signal\, which can lie anywhere in the mHz-GHz range\, possibly within reach of next-generation i nterferometers. LAST-MODIFIED:20161121T143935Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180321T150000Z DTEND:20180321T153000Z DTSTAMP:20260828T094430Z UID:2o0ohs1gnek6vh5tbdca67jck7@google.com CREATED:20180103T143347Z DESCRIPTION:Speaker: Ravi Kunjwal

Affiliation: Perimeter Institute
Title: \; How to go from the Kochen-Specker theorem to experimentally testable signat ures of \;contextuality

Abstract: \;This talk will focus on the question of what precise signatures one should look for in an \;experiment to r ule out the possibility that the experiment admits a well-defined classical model. By \;a “classical” model\, we refer to a particular notion of c lassicality\, namely\, noncontextuality\, inspired \;by the Kochen-Spec ker theorem. The Kochen-Specker theorem is a mathematical result that point s \;out the inconsistency between quantum theory and any putative under lying model of it where the \;outcomes of a measurement are fixed prior to the act of measurement (that is\, deterministically) by \;some (pos sibly hidden) physical states of the system in a manner that does not depen d on \;(operationally irrelevant) details of the measurement context\, i.e.\, the assignments are fixed \;noncontextually in the model. This t heorem is not experimentally testable\, unlike Bell’s theorem\, \;becau se of idealizations (such as outcome determinism) that are implicit in its statement. I will \;describe some recent work on how to go from the Koc hen-Specker theorem to an experimentally \;robust signature of the fail ure of noncontextuality. Making minimal assumptions about the \;operati onal theory describing the experiment\, such signatures \;— noise-robus t noncontextuality inequalities \;— \;do not rely on the validity o f the \;entire quantum formalism. In other words\, they can be used to assess nonclassicality even if an \;experiment admits deviations from q uantum theory. LAST-MODIFIED:20180312T175816Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171102T123000 DTEND;TZID=America/New_York:20171102T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20171102T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nSarthak Chandra\nUniversity of Maryland / IREAP\nTitl e: Modeling the Network Dynamics of Pulse-Coupled Neurons\nAbstract: Comput er modeling of neural dynamics is an important component of the long-term g oal of understanding the brain. A barrier to such modeling is the practical limit on computer resources given the enormous number of neurons in the hu man brain (about 10^11.) Our work addresses this problem by developing a me thod for obtaining low dimensional macroscopic descriptions for functional groups consisting of many neurons. Specifically\, we formulate a mean-field approximation to investigate macroscopic network effects on the dynamics o f large systems of pulse-coupled neurons and derive a reduced system of ord inary differential equations describing the dynamics. We find that solution s of the reduced system agree with those of the full network. This dimensio nal reduction allows for more efficient characterization of system phase tr ansitions and attractors. Our results show the utility of these dimensional reduction techniques for analyzing the effects of network topology on macr oscopic behavior in neuronal networks. LAST-MODIFIED:20171012T173454Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180402T193000Z DTEND:20180402T203000Z DTSTAMP:20260828T094430Z UID:3a11pu08gpfmidfr33t951os1o@google.com CREATED:20180322T154026Z DESCRIPTION:Sp eaker Name: Kendrick Smith

Speaker Institution : Perimeter Institute for Theoretical Physics


Title : Searching for Fast Radio Bursts and Pulsars with CHIME

Notes: Re freshments available at 3:00 pm
PM.
Abstract : CHIME is a new interferometric telescope at radio freq uencies 400-800 MHz. The mapping speed (or total statistical power) of CHIM E is among the largest of any radio telescope in the world\, and the techno logy powering CHIME could be used to build telescopes which are orders of m agnitude more powerful. This breakthrough sensitivity has the power to revo lutionize radio astronomy\, but meeting the computational challenges will r equire breakthroughs on the algorithmic side. I'll give a status update on CHIME\, with an emphasis on new algorithms being developed to search for fa st radio bursts (FRB's) and pulsars. The CHIME FRB survey coming online in a few months should increase the number of known FRB's by orders of magnitu de and help elucidate their origin. \; LAST-MODIFIED:20180322T154214Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170422T130000Z DTEND:20170422T200000Z DTSTAMP:20260828T094430Z UID:nvbe1ms3a2ue84ae22nbi5afj8@google.com CREATED:20170412T164013Z DESCRIPTION:9 am near the Washington Monument\nThe big day! Rally points to meet up the way: 8:00 am at the PSC Lobby\n8:30 am at the Prince George’s Plaza Metro (NOTE: College Park and\nGreenbelt Metro will be closed)\n9:30 am at 17th and Pennsylvania NW\n\nFlyer: https://drive.google.com/file/d/0B z4x8ufYIK7fX1RKOTJIQWZxNUU/view?usp=sharing LAST-MODIFIED:20170412T175521Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:March for Science TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180419T180000Z DTEND:20180419T193000Z DTSTAMP:20260828T094430Z UID:0as5vloru7ujg9bt4tj7l7f7t9@google.com CREATED:20180330T024356Z DESCRIPTION:
Speaker: Robert McDermott\, Univ of Wisc

Title: \; Measurement and Controlof Superconducting Qubits Using Single Flu x Quantum Digital Logic

Abstract: \; While there hasbeen tremendous recent progress in the realization of small-scale quantumcircui ts comprising of order 10 qubits\, research indicates that afault-tolerant quantum computer that exceeds what is possible on existingclassical machine s will require a network of thousands or millions of qubits\,far beyond cur rent capabilities. Robust approaches to the measurement andcontrol of large -scale next-generation quantum processors have yet to bedeveloped.

In this talk I describean experimental program to develop high-f idelity qubit measurement and controlcircuitry based on the superconducting Single Flux Quantum (SFQ) digital logicfamily. Qubit measurement is perfor med by mapping the state to the microwavephoton occupation of a linear reso nator followed by subsequent photodetectionwith a microwave photon counter. This scheme provides access to the binarydigital output of qubit measureme nt at the millikelvin experimental stage\,without the need for room-tempera ture heterodyne measurement and thresholding. Rawsingle-shot measurement fi delity up to 92% has been achieved\, limited by qubitrelaxation. Moreover\, we exploit the intrinsic damping of the counter to efficientlyextract the energy released by the measurement process\, allowing fast\, repeatedhigh-f idelity measurements.

Coherent controlof the qub it is performed using trains of quantized SFQ flux pulses. Each ofthese pul ses provides a delta function-like kick to the qubit\, inducing atrajectory on the Bloch sphere that can be tailored to minimize leakage errors.We des cribe the fabrication and characterization of a transmon qubit chip incorpo ratingan on-chip SFQ pulse driver. We achieve gate fidelity up to around 98 %\, limitedby quasiparticle generation from the dissipative SFQ pulse drive r. I discussnext-generation designs that are expected to significantly miti gatequasiparticle poisoning.

These two effortspoi nt a direction toward the integration of a large-scale superconductingquant um processor with proximal classical superconducting logic for thepurposes of reducing latency\, wiring heat load\, and overall system footprint.

Host: Vladimir Manucharyan LAST-MODIFIED:20180330T024356Z LOCATION:Rm 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Robert McDermott\, Univ of Wisc TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180521T200000Z DTEND:20180521T213000Z DTSTAMP:20260828T094430Z UID:1bc6qnc5u2dub12kjpgnj7egrh@google.com CREATED:20180514T174855Z DESCRIPTION:

Speaker: Sandipan Kundu\, Johns Hopkins University

Speaker Ins titution: Johns Hopkins University

Title: Causality and energy condit ions in QFT

Abstract: Causality places nontrivial constraints on QFT in Lorentzian signature\, for example fixing the signs of certain terms in the low energy Lagrangian. In conformal field theory\, I will show how caus ality is encoded in crossing symmetry and reflection positivity of Euclidea n correlators\, and derive constraints on the interactions of low-lying ope rators. I will explain the connection between the causality constraints in the lightcone limit and the averaged null energy condition. In particular\, causality implies that the averaged null energy must be positive in intera cting quantum field theory in flat spacetime. Whereas\, for CFTs with large central charge and a sparse spectrum\, causality constraints in the Regge limit leads to a stronger energy condition which is a generalization of the averaged null energy condition. This causality condition leads to non-triv ial constraints on CFT 3-point couplings. In particular\, I will also show that these constraints are consistent with the expectation that CFTs in thi s class\, irrespective of their microscopic details\, admit universal gravi ty-like holographic dual description.

LAST-MODIFIED:20180517T165404Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171005T123000 DTEND;TZID=America/New_York:20171005T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20171005T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nGeorge Tsironis\nUniversity of Crete | Department of Physics\nTitle: Complexity and Self Organization in Superconducting Metamat erials\n\nAbstract: "Macroscopic quantum devices are becoming reality not o nly for computational purposes but also as sensors and for other general ap plications In this talk we will focus on superconducting technology and an alyze the emergence of coherence in coupled networks of meta-atoms made of units such as SQUIDS and Josephson junctions. These networks may operate c lassically in a negative permeability regime[1]\, induce intrinsic nonlinea r localized modes and partial coherence in the form of chimeras[2]\, tame d isorder through hysteretic loops or transmit through nonlinear frequency ba nds. In the quantum regime\, on the other hand\, meta-atoms may interact th rough injected electromagnetic fields and form propagating “quantum breathe rs”\, i.e. compound semi-classical propagating modes induced by the nonline arity of the qubit-field interaction [3]. These coherent modes generate s elf-induced transparency in the medium and in certain cases may also induce super-radiance. \n\n[1] N. Lazarides and G. P. Tsironis\, rf SQUID metama terials\, Appl. Phys. Lett. 90\, 163501 (2007).\n[2] N. Lazarides\, G. Neo fotistos\, and G. P. Tsironis\, Chimeras in SQUID metamaterials\, Physical Review B 91\, 054303 (2015).\n[3] Z. Ivic\, N. Lazarides\, and G. P. Tsiro nis\, Qubit lattice coherence induced by electromagnetic pulses in supercon ducting metamaterials\, Scientific Reports 6\, 29374(2016)." LAST-MODIFIED:20170911T175807Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160926T200000Z DTEND:20160926T210000Z DTSTAMP:20260828T094430Z UID:p5qn2u44m5jsv9ods9t15jv41k@google.com CREATED:20160921T155341Z DESCRIPTION:Speaker Name: Dr. Yi Jiang\n\nSpeaker Institution : Georgia Sta te University\n\nTitle : Modeling Cell-ECM Interactions in Cancer Invasion\ n\nAbstract : The extracellular matrix (ECM)\, a fibrous material that form s a network in tissues\, significantly affects many aspects of cellular beh avior\, including cell movement and proliferation. Transgenic mouse tumor s tudies indicate that excess collagen\, a major component of ECM\, enhances tumor formation and invasiveness. Clinically\, tumor associated collagen si gnatures are strong markers for breast cancer survival. However\, the under lying mechanisms are unclear since the properties of ECM are complex\, with diverse structural and mechanical properties depending on various biophysi cal parameters. We have developed a three-dimensional elastic fiber network model\, studied the structure of 3D networks\, and calibrated the mechanic al properties using in vitro collagen mechanical measurements. Using this m odel\, we study ECM remodeling as a result of local deformation and cell mi gration through the ECM as a network percolation problem. We are in the pro cess of developing a three-dimensional\, multiscale model of cell migration and interaction with ECM. Preliminary results reproduced quantitative sing le cell migration experiments. This model is a first step toward a fully bi omechanical cell-matrix interaction model\, which may shed light on tumor a ssociated collagen signatures in breast cancer development.\n LAST-MODIFIED:20160926T155550Z LOCATION:CHEM 0112 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181009T171500Z DTEND:20181009T181500Z DTSTAMP:20260828T094430Z UID:5nroiqp101nfng3c2mr8vst7pf@google.com CREATED:20180905T132004Z LAST-MODIFIED:20180905T132004Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161013T193000Z DTEND:20161013T203000Z DTSTAMP:20260828T094430Z UID:46sfi8qurneld94urtt4ij3qnc@google.com CREATED:20160930T180017Z DESCRIPTION:Speaker: Matt Calkins (UMd)\nAbstract: Discussion of the paper by Polishchuk and Zaslow\,\nCategorical mirror symmetry: the elliptic curve \, Adv. Theor. Math. Phys. 2 \n(1998)\, no. 2\, 443-470\, arXiv:math/980111 9. LAST-MODIFIED:20160930T180017Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Polishchuk-Zaslow approach to mirror symmetry for elliptic curv es TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160919T190000Z DTEND:20160919T203000Z DTSTAMP:20260828T094430Z UID:mht1qhul8a6e5idaqn225uehhc@google.com CREATED:20160912T163910Z DESCRIPTION:Speaker: Yuhsin Tsai\n\nSpeaker Institution: University of Mary land\n\nTitle: Partially Acoustic Dark Matter\, Interacting Dark Radiation\ , and Large Scale Structure\n \nAbstract: The standard paradigm of collisio nless cold dark matter is in tension with measurements on large scales. In particular\, the best fit values of the Hubble rate and the matter density perturbation inferred from the CMB seem inconsistent with the results from direct measurements. In this talk\, I will give a solution to both problems from a WIMP-like dark sector\, in which part of the DM particles have acou stic oscillations with dark radiation during the structure formation time. The oscillations reduce the growth of matter density perturbation\, solving the large scale structure problem\, and the presence of tightly coupled da rk radiation ameliorates the Hubble problem. LAST-MODIFIED:20160912T163910Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T203000Z DTEND:20161205T213000Z DTSTAMP:20260828T094430Z UID:9fi3b6cdj569ir24lge1qon15s@google.com CREATED:20161130T142859Z DESCRIPTION:Speakers: Peter Shawhan (UMD)\, Steven Christe (NASA/GSFC)\, an d Will Zhang (NASA/GSFC) \n\nTime: 3:30 PM - 4:30 PM (Refreshments @ 3:00 pm)\nLocation: Physical Sciences Complex Room 1136\, University of Marylan d\, College Park \n\nAbstract : This month’s JSI colloquium will feature th ree short talks on new mission concepts being proposed to recent and upcomi ng NASA SMEX\, MoO\, and MidEx mission opportunities that involve members o f JSI. Please join us in learning about the instruments\, mission concepts\ , and their science menus.\n\nhttps://jsi.astro.umd.edu/jsi-colloquium-seri es\n\n\n\n LAST-MODIFIED:20161130T143445Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170420T163000Z DTEND:20170420T173000Z DTSTAMP:20260828T094430Z UID:5rp3ems66nfgl78l9hl65jrg44@google.com CREATED:20170417T190427Z DESCRIPTION:PHYS 798E and ENEE 698D\n\nTitle: “Adjoint Methods in Physics a nd \n\n Engineering”\n\nSpeaker: Prof. Thomas Antonsen\, Physics\, IREAP and ECE\, U of Md.\n\nAbstract: Physicists and engineers frequently encounter situations where calculations of the governing equations of a sys tem of interest appear to need to be repeated many times to describe or opt imize the system. It is often the case that only a particular state depende nt quantity or metric needs to be determined. In this case a computational savings can be achieved if an “adjoint problem” can be found that produces the desired information without requiring multiple computations. A simple example is the design of a receiving antenna. One wishes to know and optimi ze the signal received as a function of the incident angle and polarization of incoming waves. It might appear that solution of Maxwell’s field equati ons would have to be repeated for each possible incident direction and pola rization. However\, due to the reciprocal property of the governing equatio ns\, the desired information is obtained by treating the antenna as a trans mitter and calculating the far field radiation pattern. Thus\, one computat ion replaces many. In this talk I will review some problems from the area o f charged particle dynamics where adjoint methods have proven useful. A new example is the optimization of electron beam optics in beam sources used i n microwave and millimeter wave amplifiers.\n\nBio: Thomas M. Antonsen Jr. is Professor of Physics and Electrical and Computer Engineering Institute and a member of Institute for Research in Electronics and Applied Physics.\ n\n\n\n LAST-MODIFIED:20170417T190611Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180201T203000Z DTEND:20180201T213000Z DTSTAMP:20260828T094430Z UID:61676cm024pcjdv6gga87h97h8@google.com CREATED:20180126T152132Z DESCRIPTION:Speaker: Daniel Lay -
Abstract: We will start going through Nigel Hitchin's Lectures on Generalized Geometry\, arXiv:1008.0973 LAST-MODIFIED:20180126T152132Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Hitchin notes section 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T144500Z DTEND:20161130T154500Z DTSTAMP:20260828T094430Z UID:e1l5uln2i380878lngb407dk2c@google.com CREATED:20161118T194900Z DESCRIPTION:Speaker Name: Prof. Andrea Alù\n\nSpeaker Institution : Departm ent of Electrical and Computer Engineering\, The University of Texas \n\nTi tle : Breaking Reciprocity Using Metamaterials\n\nAbstract : Metamaterials offer unprecedented opportunities to tailor and enhance the interaction of waves with materials. In this talk\, I discuss our recent research activity in electromagnetics\, nano-optics and acoustics\, showing how suitably tai lored meta-atoms and suitable arrangements of them open exciting venues to manipulate and control waves in unprecedented ways. In particular\, I will focus on our recent work in the area of non-reciprocal devices\, from acous tics to nanophotonics\, with the overall goal of largely breaking Lorentz r eciprocity and realize isolation in practical devices without using magneti c bias. Our approaches are based on using suitably tailored mechanical moti on\, spatio-temporal modulation\, and large nonlinearities in coupled reson ator systems\, and have enabled magnetic-free circulators and isolators for sound\, microwaves\, THz and optical frequencies\, non-reciprocal antennas \, emitters and absorbers breaking Kirchhoff’s law\, self-induced isolation for high-intensities triggered by nonlinearities\, and a new generation of topological insulators for light and sound. In the talk\, I will also disc uss the impact of these concepts from basic science to practical technology .\n\n LAST-MODIFIED:20161118T195758Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170621T150000Z DTEND:20170621T160000Z DTSTAMP:20260828T094430Z UID:cranf04fu3a08f2qv9jjgkr3vg@google.com CLASS:PUBLIC CREATED:20170523T111246Z DESCRIPTION:Darrick Chang\, ICFO\, Spain\n\nQuantum optics using two-dimens ional atomic arrays\n\nTraditional quantum interfaces between atomic ensemb les and light have relied upon disordered three-dimensional atomic gases. R ecently\, however\, capabilities have emerged to form lower-dimensional\, o rdered arrays of trapped atoms. This raises the interesting question of whe ther such systems can give rise to qualitatively different quantum optical phenomena and functionality\, as compared to traditional interfaces. Here\, we discuss ongoing work to explore this question in two-dimensional arrays . We show how a single 2D layer can form a nearly perfect mirror for near-r esonant light or constitute an efficient quantum memory. We also discuss ho w atomic Rydberg interactions can be used to endow the system with strong o ptical nonlinearities at the single-photon level\, whose dynamics exhibit r ich spatio-temporal behavior as compared to typical quasi-1D field propagat ion through atomic ensembles. LAST-MODIFIED:20170621T150759Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161003T203000Z DTEND:20161003T213000Z DTSTAMP:20260828T094430Z UID:uikd727to242oid99l61v4766s@google.com CREATED:20160908T140526Z DESCRIPTION:Speaker Name: Peter Biermann\n\nSpeaker Institution : MPIfR\, B onn\; KIT\, Karlsruhe\; Univ. of Alabama\, Tuscaloosa\; Univ. of Bonn\n\nNo tes: Coffee\, Tea & Snacks 4:15-4:30 PM\n\nTitle : Massive star explosions\ , cosmic rays and gravitational waves\n\nAbstract : Massive stars explode v ia a mechanism which we do not know. All of them are in binary star systems . A fraction of them blow up as Gamma Ray Bursts. Massive stars\, depending on their heavy element abundance\, commonly produce stellar black holes. W hen two such black holes are produced they finally merge in a gigantic burs t of gravitational waves\, now observed. All of these stars have powerful m agnetic winds\, that throw out most of their zero-age mass before the explo sion. When they blow up the shock races through this wind and the surroundi ng shell to produce cosmic ray particles: The supernova shock speed through the wind and the magnetic field in the wind are observed\, both for blue s uper-giant star explosions as well as for red super-giant star explosions: numbers for both kinds of stars are essentially the same. The implied chara cteristic particle energies are EBohm = 10^15.3 ± 0.3 Z eV\; and EJokipii = 10^17.3 ± 0.2 Z eV\, just what the data require for knee and ankle. Thus\, by studying the cosmic ray particles\, their abundances at knee energies\, and their spectra\, we can learn about what drives these stars to produce the most powerful outbursts yet known in the universe.\n LAST-MODIFIED:20160929T175400Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar - Massive star explosions\, cosmic rays and g ravitational waves TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180108T160000Z DTEND:20180108T170000Z DTSTAMP:20260828T094430Z UID:3o9g4c52k55hd156alng1jt11b@google.com CREATED:20180103T142227Z DESCRIPTION:Speaker: Srinivasan Arunachalam\n\nAffiliation: CWI\, Amsterdam \n\nTitle: Quantum Query Algorithms are Completely Bounded Forms\n\nAbstrac t: We prove a characterization of t-query quantum algorithms in terms of th e unit ball of a space of degree-2t polynomials. Based on this\, we obtain a refined notion of approximate polynomial degree that equals the quantum q uery complexity\, answering a question of Aaronson et al. (CCC’16). Our pro of is based on a fundamental result of Christensen and Sinclair'87 that gen eralizes the well-known Stinespring representation for quantum channels to multilinear forms. Using our characterization\, we show that many polynomia ls of degree four are far from those coming from two-query quantum algorith ms. We also give a simple and short proof of one of the results of Aaronson et al. showing an equivalence between one-query quantum algorithms and bou nded quadratic polynomials.Joint work with Jop Briet and Carlos Palazuelos. LAST-MODIFIED:20180103T142227Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171025T190000Z DTEND:20171025T200000Z DTSTAMP:20260828T094430Z UID:0anb7j66dno5b6j0d4jahd2l1a@google.com CREATED:20171024T134608Z DESCRIPTION:Speaker: Prof. Yifei Mo\n\nTitle: Computation Accelerated Desi gn of Materials and Interfaces for Solid-State Batteries\n\nAbstract:\nAll- solid-state Li-ion battery based on solid electrolytes is a promising next- generation battery technology with high energy density\, intrinsic safety\, long-life cyclability\, and high-rate charging/discharging. However\, mult iple challenges\, such as low ionic conductivity of solid electrolytes and poor interfacial compatibility at the solid electrolyte-electrode interface s\, are impeding the development of this novel technology. To resolve these materials challenges\, we will design new materials and interfaces through an accelerated approach guided by computation\, in contrast to a conventio nal trial-and-error approach. We will leverage an array of computation tech niques to provide unique materials insights into the fundamental materials limitations and to establish general design principles of materials for ove rcoming such challenges. In the first part of the presentation\, we will us e first-principles atomistic modeling to reveal the origin of ultra-fast di ffusion in lithium super-ionic conductors\, which uniquely exhibit several orders of magnitude higher ionic conductivity than most solids. Materials d esign principles for fast ion conductors will be established based on the n ewly gained understanding\, and such design principles will be demonstrated in our computation-guided discovery and design of new super-ionic conducto rs. In addition\, we will present our first-principles database approach in investigating the compatibility of heterogeneous interfaces between electr olyte and electrodes\, which are difficult to access in experiments. Key li miting factors at the solid electrolyte-electrode interfaces will be identi fied\, and corresponding interfacial design using new materials will be pro posed from computation guidance to address these interfacial limitations. T he demonstrated computation capabilities represent a transferable model in designing new materials for emerging technologies. LAST-MODIFIED:20171024T134608Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160419T150000Z DTEND:20160419T160000Z DTSTAMP:20260828T094430Z UID:9s2veo39lgsbqqvtl2524h4bjg@google.com CLASS:PUBLIC CREATED:20160415T125644Z DESCRIPTION:speaker: Angela Kou\ninstitution: Yale University\n\n\nSupercon ducting qubits are created by connecting Josephson junctions\, which are no n-linear\, non-dissipative elements\, to simple electrical circuits. Using this same toolbox of inductors\, capacitors\, and Josephson junctions\, one is also able to generate different interactions between qubits. In this ta lk\, I will discuss prospects for using the fluxonium qubit for quantum sim ulation. The fluxonium qubit is particularly suited to quantum simulation b ecause its energy spectrum is strongly anharmonic and tunable with applied external flux. I will describe a gradiometric circuit based on the fluxoniu m qubit\; this circuit is the smallest building block for realizing a z z-t ype interaction between fluxonium qubits. We find excellent agreement betwe en the measured spectroscopy of the circuit and the theoretically-predicted level transitions. In addition\, this circuit is engineered to be insensit ive to global magnetic field noise and allows us to bound the local and glo bal flux noise present in the circuit. I will conclude with a proposal for coupling fluxonium qubits in a 1-dimensional array. This array can be mappe d to an Ising chain and exhibits multiple quantum phase transitions\, whose signatures can be observed experimentally. LAST-MODIFIED:20160415T125644Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170830T190000Z DTEND:20170830T203000Z DTSTAMP:20260828T094430Z UID:5b61jsj5qb0rak2524vdt3mrnt@google.com CREATED:20170825T132043Z DESCRIPTION:Speaker: Ho Jung Paik\n\nSpeaker Institution: University of Mar yland\n\nTitle: New tensor gravitational wave detector based on superconduc ting technology\n\nAbstract: Detection of gravitational waves (GWs) from bi nary black holes (BHs) by Advanced LIGO has opened the new era of GW astron omy. Many conceivable sources such as intermediate-mass BH binaries and whi te dwarf binaries would emit GWs below 10 Hz. A mid-frequency tensor GW det ector could be constructed by combining six magnetically levitated supercon ducting test masses. Such a detector is equally sensitive to GWs coming fro m anywhere in the sky\, and is capable of resolving the source direction an d wave polarization. I will present a design concept of new mid-frequency d etector SOGRO that could reach a sensitivity of 10-19-10-21 Hz-1/2 at 0.1-1 0 Hz. I will also discuss how the new detector mitigates the seismic and Ne wtonian noise\, which are formidable obstacles in constructing terrestrial GW detectors at low frequencies. LAST-MODIFIED:20170825T132043Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161108T181500Z DTEND:20161108T191500Z DTSTAMP:20260828T094430Z UID:ilogom0s1eovemoile88ve6uvo@google.com CREATED:20161102T143511Z DESCRIPTION:Speaker Name: Professor Jianshu Cao\n\nSpeaker Institution : MI T\n\nTitle : "Non-Equilibrium Conformational Fluctuations in Enzymes and Me mbranes"\n\nAbstract : Two examples will be presented to demonstrate the i nfluence of non-equilibrium \nconformational dynamics on bio-molecular syst ems. \n(1) To explain the recent measurements of non-equilibrium fluctuatio ns in redblood-cell\n(RBC) membranes\, we proposed a mechanism for ATP regu lation of \nmembrane mechanics\, and derived a generalized Langevin equatio n\, which has both \nthe thermal noise and the ATP induced active noise. Fr om its steady-state solution\, \nwe can establish the non-Gaussian steady s tate distribution and identify a stochastic \nresonance effect. We were abl e to reproduce experimental data of non-equilibrium \nRBC membrane fluctuat ions without any adjustable parameters. \n(2) Recent single molecule experi ments on enzymes reveal conformational \nfluctuations on multiple time scal es\, but measured turnover rate always follows the \nMichaelis-Menten (MM) equation. To resolve this puzzle\, we established the\ngeneralized rate equ ation for an arbitrary enzymatic network\, which reduces to the \nMM form\, when conformational detailed balance is obeyed. The new expression \npredi cts a relation between non-MM correction terms and network topology. If tim e \nallows\, I will also discuss the information content of the Poisson ind icator\, which \nquantifies the statistics of chemical reactions.\n LAST-MODIFIED:20161104T140616Z LOCATION: IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170420T163000Z DTEND:20170420T173000Z DTSTAMP:20260828T094430Z UID:p2l521s1ncjtk5ah1m78ncc6c0@google.com CREATED:20170127T153714Z DESCRIPTION:Speaker Name: James Yorke\n\nSpeaker Institution: University o f Maryland\n\nTitle: Multi Chaos: A low dimensional Paradigm for higher-di mensional chaos\n\nAbstract: The most frequently studied dynamical systems are low dimensional and all the periodic orbits in a chaotic set have the s ame number of unstable dimensions\, but this property seems to fail in high dimensional systems. In this paper\, we define a property called "multi-ch aos"\, in which\, along with the usual properties of chaos\, there is a den se set of k-dimensionally unstable periodic orbits\, and this holds for mor e than one k. We provide examples including a piecewise linear generalized Baker map. LAST-MODIFIED:20170407T202118Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171021T230000Z DTEND:20171022T003000Z DTSTAMP:20260828T094430Z UID:42ito1invrkbifohv4olcmhmve@google.com CREATED:20170913T142657Z DESCRIPTION:Explore the science of motion and Newton's Laws at Physics is P hun\, UMD Physics' free public demonstration program. Program offered both Friday 10/20 and Saturday 10/21 at 7:00 pm.\n\nhttps://umdphysics.umd.edu/e vents/aboutus-outreach/physics-is-phun.html\n\nFor information: lecdemo_out reach@physics.umd.edu LAST-MODIFIED:20170918T151036Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: The World in Motion TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180402T200000Z DTEND:20180402T213000Z DTSTAMP:20260828T094430Z UID:7phvhmr8ng9nuqbq4rvdv40dr7@google.com CREATED:20180326T133641Z DESCRIPTION:\nSpeaker: Vivian Poulin\n\nSpeaker Institution: Johns Hopkins University\n\nTitle: Shedding light on Dark Matter with Cosmological Observ ations\n\nAbstract: For over 80 years\, Dark Matter (DM) has puzzled physic ists across various fields.\nIn this talk\, I would like to take a cosmolog ist’s perspective on this conundrum and discuss the status of what observat ions (i.e. Cosmic Microwave Background (CMB)\, Big Bang Nucleosynthesis and probes of the matter spectrum) tell us about the nature of DM. In particu lar\, they provides us with the most accurate (and quite robust) measuremen t of the DM relic density today\, but are potentially sensitive to many mor e of the DM properties. First\, I will review the great complementarity of our cosmological probes to look for energy injection following e.g. DM anni hilation and decay\, and compare them with cosmic and gamma rays constraint s. Second\, cosmological observables are sensitive to scattering between st andard model (SM) particles and DM. I will discuss a very recent exotic sig nal observed in 21 cm surveys and how it could hint at such interaction. Fi nally\, cosmological observables can teach us about DM even if it doesn’t h ave any non-gravitational interactions with the SM. As an example\, I will discuss how the CMB can constrain the mass and abundance of axion-like part icles\, very light scalar fields with periodic potential\, that can be used to explain both the DM and the Dark Energy observed in our universe. LAST-MODIFIED:20180326T134438Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161201T173000Z DTEND:20161201T183000Z DTSTAMP:20260828T094430Z UID:6esifid16f32fesup9oqee0p9g@google.com CREATED:20160826T151535Z DESCRIPTION:Speaker Name: James Yorke\n\nSpeaker Institution : University o f Maryland College Park | Departments of Mathematics and Physics\n\nTitle : A book report: How complex cells evolved from bacteria\, a story of energy LAST-MODIFIED:20161012T184451Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180402T110000 DTEND;TZID=America/New_York:20180402T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180402T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: Christopher Richardson\n\nAffiliation: LPS\n\nTitle: \n\nAbstract: LAST-MODIFIED:20180329T185043Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170427T193000Z DTEND:20170427T210000Z DTSTAMP:20260828T094430Z UID:fqt84fsckkik5gur0v6ueim5f4@google.com CREATED:20170421T164059Z DESCRIPTION:Speaker: Matt Dellatorre (UMCP) - \nAbstract: We'll start to t alk about Ch. 7 of the book.\n LAST-MODIFIED:20170421T164059Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Ricci-flat Kahler metrics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180126T160000Z DTEND:20180126T170000Z DTSTAMP:20260828T094430Z UID:2lg8pcal1otee9qamna76ci0lq@google.com CREATED:20180103T142838Z DESCRIPTION:Speaker: Justin Thaler\n\nAffiliation: Georgetown University\n\ nTitle: The Polynomial Method Strikes Back: Tight Quantum Query Bounds via Dual Polynomials\n\nAbstract: The eps-approximate degree of a Boolean funct ion is the minimum degree of a real polynomial that point-wise approximates f to error eps. Approximate degree has wide-ranging applications in theore tical computer science. As one example\, the approximate degree of a functi on is a lower bound on its quantum query complexity. Despite its importance \, the approximate degree of many basic functions has resisted characteriza tion. \nIn this talk\, I will describe recent advances in proving both uppe r and lower bounds on the approximate degree of specific functions. \n\nThe se advances yield tight (or nearly tight) bounds for a variety of basic fun ctions. Our approximate degree bounds settle (or nearly settle) the quantum query complexity of many of these functions\, including k-distinctness\, j unta testing\, approximating the statistical distance of two distributions\ , and entropy approximation. \n\nBased on joint work with Mark Bun and Robi n Kothari. LAST-MODIFIED:20180103T142838Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180927T170000Z DTEND:20180927T183000Z DTSTAMP:20260828T094430Z UID:6bltpi1unrmkf9fcl2d2a8106e@google.com CREATED:20180904T134855Z DESCRIPTION:\nTitle: Coarse Graining Hadronic and Nuclear Interactions\n\nS peaker: Enrique Ruiz Arriola\, University of Granada\n\nAbstract: Hadronic interactions are explained in terms of meson \nexchange at long distances\, but require subnuclear degrees of freedom in \nmany situations of interest . I discuss how with relatively simple \nWilsonian ideas and scale analysis a competitive framework can be \ndiscussed to describe select and fit data above the inelastic threshold. \nWe analyze specifically the pipi \, piN a nd NN interactions up to several \nGeV's and its possible consequences in n uclear physics and short \ndistance correlations in nuclear matter. LAST-MODIFIED:20180912T203808Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160502T200000Z DTEND:20160502T210000Z DTSTAMP:20260828T094430Z UID:6k6f8dcs3gekb3o94h8pq5j5hc@google.com CREATED:20160427T191233Z DESCRIPTION:Speaker Name: Kwaku Dayie\n\nSpeaker Institution: University o f Maryland\n\nTitle: Decloaking the Invisible: How ubiquitous are transien t lowly populated RNA states in biology?\n\nAbstract: RNAs are the center of biology\, yet their characterization by high resolution methods are hamp ered by dynamic heterogeneity (for X-ray crystallography) and size (for nuc lear magnetic resonance spectroscopy). I describe new technologies we have developed to tackle the size and dynamic heterogeneity problem\, and showca se how solution conditions can trigger a partitioning of minor populated st ates with rapidly exchanging predominant conformers with transient lifetime s that until now were invisible to traditional structural probing. Our resu lts suggest that these transient (milliseconds)\, lowly populated states\n\ nRefreshments served at 3:45pm LAST-MODIFIED:20160428T184305Z LOCATION:Marker Seminar Room\, 0112 Chemistry Bldg\, SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar - Decloaking the Invisible: How ubiquitous are t ransient lowly populated RNA states in biology? TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170224T180000Z DTEND:20170224T190000Z DTSTAMP:20260828T094430Z UID:0sv395fm7eoao65m6d23atc318@google.com CREATED:20170126T194034Z DESCRIPTION:Speaker Name: Veerle Keppens\, Professor and Chair\n\nInstituti on: University of Tennessee\n\nTitle: EuTiO3: the Magnetic Doppelganger of SrTiO3 \n\nAbstract:The tilting of the oxygen octahedra in cubic perovskite s is known to induce structural phase transitions\, which are often associa ted with the emergence of intriguing physical phenomena. While SrTiO3 is on e of the most extensively studied perovskite oxides for its structural phas e transition at 105 K\, the discovery of magnetoelectric coupling in isostr uctural EuTiO3 has triggered many theoretical and experimental studies focu sed on this compound. I will present resonant ultrasound studies of the ext remely subtle cubic to tetragonal structural phase transition at 288 K in E uTiO3 single crystals and the evolution of the physical properties upon che mical doping. The collective set of experimental data contributes to a bett er understanding of the link between lattice\, magnetic and electrical degr ees of freedom in the EuTiO3 system\, helps evaluate the similarities and d ifferences between SrTiO3 and EuTiO3\, and provides insight in the possible origin of the much higher structural transition temperature for EuTiO3 com pared to SrTiO3. LAST-MODIFIED:20170126T194034Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170418T150000Z DTEND:20170418T161500Z DTSTAMP:20260828T094430Z UID:f4iji5efnu4a4unjkvncdjsjb8@google.com CREATED:20170123T222655Z DESCRIPTION:Speaker: QingLin He (UCLA)\n\nTitle: Chiral Majorana fermion ed ge state in a quantum anomalous Hall insulator-superconductor structure\n\n Abstract: Majorana fermion is a hypothetical fermionic particle which is it s own anti-particle. Intense research efforts focus on its experimental obs ervation as a fundamental particle in high energy physics and as a quasi-pa rticle in condensed matter systems. In this seminar\, the transport measure ment to ascertain the one-dimensional chiral Majorana fermion in the hybrid system of a quantum anomalous Hall insulator thin film coupled with a conv entional superconductor will be presented. A series of topological phase tr ansitions are controlled by the reversal of the magnetization\, where the h alf-integer quantized conductance plateau (0.5 e2/h) is observed as a compe lling signature of the Majorana fermion as theoretically predicted. This tr ansport signature can be well repeated during many magnetic reversal sweeps \, and can be tracked at different temperatures\, providing direct evidence of the chiral Majorana edge modes in the system. The above observations de monstrate the experimental evidences of the chiral Majoranas edge state in a topological superconductor\, which may lead to the development of topolog ical quantum computation.\n\nLocation: 2205 John S. Toll Physics Building\n \nHost: Ching-Kai Chiu\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170323T171544Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171201T160000Z DTEND:20171201T165000Z DTSTAMP:20260828T094430Z UID:2gupml80v5p6eg3qdbf5c74727@google.com CREATED:20171009T124303Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nFinal lecture: AI Safety\n\nCourse description: This short course co vers the fundamentals of machine learning\, assuming the typical background and motives of a physicist. It's goal is to give those who attend an under standing of the field and its capabilities\, as well the tools to learn the necessary extensions of the topic to apply it to their physics research. L ectures will include introductions to Python\, Linux\, neural nets\, deep l earning\, natural language processing\, imagine recognition/computer vision \, and AI safety.\n\nRSVP for the first friday here: http://bit.ly/2xgpvDE\ njustinkterry@gmail.com LAST-MODIFIED:20171121T010230Z LOCATION:Edward St. John 2208 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180405T123000 DTEND;TZID=America/New_York:20180405T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180405T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Qin Liu\nUMD Physics\nTitle: Large-scale neural networ k modeling: from neuronal microcircuits to whole-brain complex network dyna mics\nAbstract: Neural networks mediate human cognitive functions\, such as sensory processing\, memory\, attention\, etc. Computational modeling has proved to be a powerful tool to test hypotheses of network mechanisms under lying cognitive functions\, and to better understand human neuroimaging dat a. Here we present a large-scale neural network modeling study of human bra in visual/auditory processing and how this process interacts with memory an d attention. We show how our modeling and simulation can relate phenomena a cross different scales from the neuronal level to the whole-brain network l evel. The model can perform a number of cognitive tasks utilizing different cognitive functions by only changing a task-specification parameter. Based on the performance and simulated imaging results of these tasks\, we propo sed hypothesis for the neural mechanisms underlying several important cogni tive phenomena\, which could be tested experimentally in the future. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180502T200000Z DTEND:20180502T213000Z DTSTAMP:20260828T094430Z UID:30fkqkrednlutk3lm703rm65vp@google.com CREATED:20180427T181314Z DESCRIPTION:Speaker Name: Verena I. Martinez Outschoorn\n\nSpeaker Institut ion : University of Massachusetts\n\nTitle: Unlocking the Higgs Portal with Exotic Higgs Decays\n\nAbstract : Following the discovery of the Higgs bos on at the Large Hadron Collider (LHC)\, a major goal is to characterize the properties of this new particle. The Higgs itself is a potential portal to new physics\, providing connections between the Standard Model of particle physics and new phenomena\, such as signatures of dark matter. Searches fo r new decays of the Higgs boson will be described using data collected by t he ATLAS experiment and future prospects will be discussed. The development of new electronics upgrades to allow for effective triggering and recordin g of Higgs bosons for the high luminosity upgrade of the LHC will also be p resented. LAST-MODIFIED:20180427T182202Z LOCATION:PSC Room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170921T140000 DTEND;TZID=America/New_York:20170921T153000 DTSTAMP:20260828T094430Z UID:01ridjaq5adde9chm46676q241@google.com RECURRENCE-ID;TZID=America/New_York:20170921T140000 CREATED:20170908T131846Z DESCRIPTION:SPEAKER: Dr. Lekh Poudel\, NIST Center for Neutron Research\n\ nTITLE: Quantum criticality in partially substituted RCu6 (R = Ce\, La)\n\n ABSTRACT: The quantum critical point (QCP) in CeCu6-xAux is one of the most interesting QCPs yet uncovered. The behavior of QCP in CeCu6-xAux is almos t singular and is inconsistent with the approach provided by Hertz-Millis-M oriya (HMM). The defining signature of this exotic behavior is unusual tem perature dependence of the critical spin fluctuations resulting in a fracti onal exponent in the energy over temperature (E/T) scaling of the dynamic s usceptibility. This experimental observation has recently motivated several theoretical proposals including local criticality\, the coupling between q uasiparticles and order parameter fluctuations\, and topological excitation s.\n\nUsing neutron and x-ray scattering measurements\, we have studied str uctural and magnetic properties of related series CeCu6-xAgx and LaCu6-xAux . The influence of Ag-doping in CeCu6 results in a magnetic QCP similar to that found in CeCu6-xAux [1]. Studies of the nonmagnetic analogue LaCu6-xAu x reveal a new type of QCP\, an elastic quantum critical point\, is present in this family of materials [2]. Inelastic neutron scattering measurement s of the critical composition\, CeCu5.8Ag0.2\, show that the spin excitatio n spectrum results in E/T scaling with a fractional exponent\, indicating i dentical unconventional behavior to CeCu6-xAux [2]. The key result of this study is to identify the presence of multiple fluctuations that are intrica tely overlapped in the reciprocal space [3]. When the components of the spe ctrum corresponding to the magnetically ordered side of the phase diagram a re analyzed\, they are found to be three dimensional and are consistent wit h the scaling expected for a conventional spin density wave QCP\, indicatin g that the unusual E/T scaling stems from the superposition of multiple ord er parameters [3]. \n\nReferences:\n[1] L. Poudel\, et al.\, Phys. Rev. B 9 2\, 214421 (2015). \n[2] L. Poudel et al.\, Phys. Rev. Lett. 117\, 235701 ( 2016)\n[3] L. Poudel et al.\, arXiv: 1705.05913\n\nHOST: Johnpierre Pagli one\n\n LAST-MODIFIED:20170914T163147Z LOCATION:1201 Toll Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Lekh Poudel\, NIST CNR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180919T150000Z DTEND:20180919T160000Z DTSTAMP:20260828T094430Z UID:63ob60vi8erpa84rr02fr67kd4@google.com CREATED:20180904T171912Z DESCRIPTION:Speaker: Isaac Kim\, Stanford\n\nTitle: What should we do wit h near-term quantum computers?\n\nAbstract: Soon\, quantum computing resear chers can expect to have access to a \nquantum computer consisting of 50 to 100 qubits. While fault-tolerant \nquantum computer promises great speedup s over a range of important \nproblems\, these devices will not be reliable enough to fulfill these \npromises. An outstanding challenge then is to co me up with an \napplication that can reliably carry out a nontrivial task o f interest. \nCan we do anything that is practically useful? I will argue t hat an \nimportant near-term application of a quantum computer would be the \nprediction of materialistic properties of challenging lattice models. \n This must be possible because quantum computer can significantly speed \nup the existing variational calculations for such models\, and because \nthe outcome of the computation is resistant to noise. I will report on \nan ong oing progress\, and discuss the future prospect of this program. LAST-MODIFIED:20180904T172215Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181031T150000Z DTEND:20181031T160000Z DTSTAMP:20260828T094430Z UID:1ggr9s82br98nj10afn00f1htf@google.com CREATED:20180905T135230Z DESCRIPTION:Speaker: Christopher Lukowski\, Graduate Student Literature Seminar\, UMCP

Title: TBA LAST-MODIFIED:20180905T135236Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170222T200000Z DTEND:20170222T210000Z DTSTAMP:20260828T094430Z UID:epar20rpmvp8g07bf8dquvvqk4@google.com CREATED:20170217T135930Z DESCRIPTION:Title: Artificial Intelligence Support of the Rosetta Orbiter S cience Operations\n\nAbstract: On September 30th 2016\, the European Space Agency’s Rosetta Mission ended with the Rosetta Orbiter landing on the surf ace of the comet 67P/ Churyumov-Gerasimenko. While it is well known that t his historic mission was the first mission to deploy a soft lander to a com et (Philae) and to escort a comet for two years\, it was also a pathfinding space mission from the perspective of Operations and Computer Science in i ts usage of the Artificial Intelligence planning and scheduling software fo r early to mid-range science activity scheduling and data downlink scheduli ng.\n\nI will first provide an overview of the Rosetta mission - including its over one decade journey to the 67P/C-G\, and major science discoveries from the mission. I then describe challenging elements of the high tempo\, multi-disciplinary Rosetta science planning process which incorporated div erse science\, geometric\, engineering\, and resource constraints. The tal k will then present how the ASPEN software was used in the Rosetta operatio ns process to support development of schedules for planning periods of appr oximately one month covering thousands of observations\, over a thousand po intings and slews\, over a thousand recorder dumps\, and requiring verifica tion of tens of thousands of science and operations constraints.\n\nBio: Dr . Steve Chien is a Senior Research Scientist at the Jet Propulsion Laborato ry\, California Institute of Technology where he leads efforts in autonomou s systems for space exploration. Dr. Chien has received numerous awards for his research in space autonomous systems including: NASA Medals in 1997\, 2000\, 2007\, and 2015\; he is a four time honoree in the NASA Software of the Year competition\; and in 2011 he was awarded the inaugural AIAA Intell igent Systems Award. He has led the deployment of ground and flight autono my software to numerous missions including the Autonomous Sciencecraft/Eart h Observing One\, WATCH/Mars Exploration Rovers\, Earth Observing Sensorweb s\, IPEX\, and ESA’s Rosetta. LAST-MODIFIED:20170217T140428Z LOCATION: 2460 AV Williams (the ECE conference room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar: Steve Chien\, NASA JPL TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171128T160000Z DTEND:20171128T171500Z DTSTAMP:20260828T094430Z UID:19u348e8tpqabsj7l99toqp2t0@google.com CREATED:20171108T203036Z DESCRIPTION:Speaker: Andrew Lucas (Stanford)\n\nTitle: Signatures of electr onic hydrodynamics in electrical and thermal transport\n\nAbstract: The hyd rodynamic limit is a simple\, solvable limit of the transport problem in a strongly correlated electron system. I will describe the consequences of hydrodynamics on the DC electrical and thermal conductivity\, highlighti ng three particular examples we have recently studied: (1) the consequenc es of potential vs. magnetic disorder on transport in viscous Fermi liquids \, (2) consequences of Fermi surface geometry on transport at the ballisti c-to-hydrodynamic crossover\, and (3) the experimentally observed violation s of the Wiedemann-Franz law in the quasirelativistic electron-hole plasma of graphene. These new theories may explain puzzling transport phenomena \, including T^2 resistivity in single-band SrTiO3\, and "strange metal" ph ases.\n\nHost: Junhyun Lee\n\nhttp://www.physics.umd.edu/cmtc/seminars.html \n\nWhen: Tues\, Nov. 28 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Physics Bldg.)\n LAST-MODIFIED:20171116T220104Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170501T193000Z DTEND:20170501T203000Z DTSTAMP:20260828T094430Z UID:2n3lf5su4h22o7jtacn0elsibk@google.com CREATED:20170427T153401Z DESCRIPTION:Speaker Name: Steve Boggs\n\nSpeaker Institution : UCSD\n\nTitl e : JSI Colloquium: "Exploring New Directions in Gamma Ray Astrophysics wit h COSI"\n\nAbstract : The Compton Spectrometer and Imager (COSI) wide-field gamma-ray telescope (0.2-5 MeV) is designed to probe the origins of Galact ic positrons\, uncover sites of nucleosynthesis in the Galaxy\, and perform pioneering studies of gamma-ray polarization. COSI is the first science pa yload designed to fly on NASA’s 18 MCF superpressure balloon. COSI underwen t a successful 46-day science flight in 2016\, the first science payload to launch from New Zealand. I will discuss the science goals and status of re sults of COSI\, the technological advances of the instrument\, future goals for the COSI program\, and the potential of NASA’s superpressure balloon p rogram.\nNotes: Refreshments available at 3 PM LAST-MODIFIED:20170427T153504Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170223T173000Z DTEND:20170223T183000Z DTSTAMP:20260828T094430Z UID:0n971h2rcd50qtn6ahqmtr19ms@google.com CREATED:20170127T153035Z DESCRIPTION:Speaker Name: Jeff Urbach\n\nSpeaker Institution : Department of Physics - Georgetown University\n\nTitle : Observation of Localizad St ress Fluctuations that Drive Shear Thinning in Dense Suspensions LAST-MODIFIED:20170127T153035Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171109T123000 DTEND;TZID=America/New_York:20171109T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h_R20171109T173000@google.com RECURRENCE-ID;TZID=America/New_York:20171109T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker: Charles Doering\nUniversity of Michigan | Mathematics / Center for the Study of Complex Systems\nTitle: Optimal Bounds and Extrem al Trajectories for Time Averages in Dynamical Systems\nAbstract: For any q uantity of interest in a dynamical system governed by ordinary differential equations it is natural to seek the largest (or smallest) long-time averag e among solution trajectories. Upper bounds can be proved a priori using au xiliary functions\, the optimal choice of which is a convex optimization. T he problems of finding maximal trajectories and minimal auxiliary functions are in fact strongly dual so auxiliary functions can produce arbitrarily s harp upper bounds on maximal time averages. They also define volumes in pha se space where maximal trajectories must lie. For polynomial equations of m otion auxiliary functions can be constructed by semidefinite programming\, which we illustrate using the Lorenz system. This is joint work with Ian T obasco and David Goluskin. LAST-MODIFIED:20170911T180049Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180305T160000Z DTEND:20180305T173000Z DTSTAMP:20260828T094430Z UID:6i7ql6b3retibbv3ll4aj55d2t@google.com CREATED:20171205T180740Z DESCRIPTION:Speaker: Richard Lebed\n\nSpeaker Institution: Arizona State Un iversity \n\nTitle: Building the Dynamical Diquark Model for Exotic Hadrons \n\nAbstract: The past 15 years have seen the expansion in the classes of experimentally observed hadrons to include not only mesons and baryons\, b ut tetraquarks and pentaquarks as well. We begin with a brief summary of t heir discovery\, where they fit into the scheme of known hadrons\, and thei r current experimental status. The exact nature of their structure remains completely unresolved\, and we propose a paradigm in which the exotics are composed of diquarks that are bound not like molecules\, but solely by con finement. The question then becomes how to describe such states\, and we a rgue that the Born-Oppenheimer (B-O) approximation provides the best way fo rward. Starting with B-O quantum numbers that are relevant for exotics\, w e develop the multiplets of the expected lowest-lying states\, as well as t heir decay selection rules\, in order to compare with experiment. We conc lude by identifying the wide variety of detailed\, predictive calculations that will be carried out using this formalism in the future. LAST-MODIFIED:20180215T140238Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170216T190000Z DTEND:20170216T203000Z DTSTAMP:20260828T094430Z UID:u3isj2cg21a08bro7qg58d25s4@google.com CREATED:20170213T135752Z DESCRIPTION:Speaker: Tongyan Lin\n\nSpeaker Institution: UC Berkeley\n\nTit le: Exploring the low mass frontier in dark matter direct detection\n \nAbs tract: A major challenge in decoding the particle physics of dark matter is its unknown mass scale. I will present new ideas and prospects to search f or low mass dark matter\, going below the typical thresholds of current dir ect detection experiments. In the sub-GeV mass range\, there are a variety of interesting and well-motivated models\, and detecting them will require new kinds of low-threshold targets. I will discuss several proposals for da rk matter direct detection\, showing that they can be sensitive probes of l ow mass dark matter in the coming years. LAST-MODIFIED:20170213T135752Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161107T213000Z DTEND:20161107T223000Z DTSTAMP:20260828T094430Z UID:28161D45-D282-4FFD-9ED4-4B1A0BF86DD7 CREATED:20161027T231331Z DESCRIPTION:Speaker Name: Li-Jen Chen\n\nSpeaker Institution : Goddard Spac e Flight Center\n\nTitle : The Magnetospheric Multiscale Mission: Observati ons of magnetic reconnection at the Earth's magnetopause\n\n LAST-MODIFIED:20161104T195245Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170419T190000Z DTEND:20170419T200000Z DTSTAMP:20260828T094430Z UID:th0hpjjcm403afbqfg03b1an00@google.com CREATED:20170417T135333Z DESCRIPTION:Speaker Name: Prof. Jeremy N. Munday\n\nSpeaker Institution : E lectrical and Computer Engineering and The Institute for Research in Electr onics and Applied Physics\, University of Maryland\, College Park\n\nTitle : Steering photons: from IR detectors and smart windows to space propulsion \n\nAbstract : Photons are remarkable bundles of energy that can perform a variety of tasks. In this talk\, I will present our latest research “puttin g photons to work for us!” Photons can impart both energy and moment upon r eflection or absorption. Absorption in a metal can result in the generation of electrons with excess kinetic energy. These hot electrons can be used t o enable new detectors that operate in frequency ranges not typically acces sible. As two examples\, I will present an all-metal photodetector that can detect visible light and a Si detector that can absorb near-IR light based on this principle. Next\, I will discuss our measurements of a pressure re sulting from photon reflection off a surface and how it can be used to prop el spacecraft—a device known as a solar sail. Finally\, I will discuss how polymer dispersed liquid crystals can be incorporated into solar cell devic es to enable self-powered smart windows for large scale building applicatio ns. LAST-MODIFIED:20170417T135901Z LOCATION: LPS Seminar room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171206T193000Z DTEND:20171206T210000Z DTSTAMP:20260828T094430Z UID:21ucnsqio9qr1tphd5s5e8p2dm@google.com CREATED:20170918T131517Z DESCRIPTION:Speaker: Oliver Janssen\n\nSpeaker Institution: NYU\n\nTitle: T he no-boundary proposal: alive and well\n\nAbstract: Recent work on quantum cosmology has led to a plethora of semiclassical no-boundary wave function s. Moreover it was argued that all no-boundary states receive non-perturbat ive corrections due to singular off-shell configurations\, which render lar ge perturbations in de Sitter space unsuppressed. We will review the origin al Hartle-Hawking no-boundary proposal and show that when it is carefully d efined and evaluated\, it receives no such corrections. We calculate the no -boundary wave function in anisotropic Bianchi IX cosmologies by the method of steepest descent\, taking into account the non-linear backreaction of p erturbations. We find large anisotropies are suppressed\, in agreement with holographic calculations in dual vector toy models. This suggests that the requirement that the state fits into a proper quantum mechanical framework selects a unique no-boundary wave function.\nThis work was done in collabo ration with Juan Diaz\, Jonathan Halliwell\, Jim Hartle\, Thomas Hertog and Yannick Vreys\, and\, aside from work done on quantum cosmology mainly in the late 80’s and begin 90’s\, is based on 1703.02076\, 1705.00192\, 1705.0 5340\, 1708.05104\, and an upcoming paper. LAST-MODIFIED:20171127T143123Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180411T150000Z DTEND:20180411T160000Z DTSTAMP:20260828T094430Z UID:2g7csdlu0oqjb0ci41cqpcdtha@google.com CREATED:20180405T131518Z DESCRIPTION:Speaker: Ken Dill\, Stony Brook University
Title: Cell Behaviors are not just from the Biology of Genes\, but also from the P hysics of Proteomes

Abstract: \;Some cell behav iors can be explained by the physics of the cell proteome\, the full comple ment of the cell's proteins. \; \;For example\, it appears that tem perature growth laws reflect denaturing of their proteins. \; \;Sal t slows cell growth by overcrowding the proteins. \; \;Oxidative da mage in aged cells may involve electrostatic unfolding. \; \;We exp lore these properties using physical chemical models. \; \;We also explore proteostasis\, the machinery that keeps the cell's proteins folded and disaggregated\, particularly under stress. \; \;We find many wa ys in which evolution has encoded `cleverness' into proteostasis decision-m aking.


LAST-MODIFIED:20180405T131542Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171109T190000Z DTEND:20171109T203000Z DTSTAMP:20260828T094430Z UID:41ubuvk66plukeoskhe2lvge42@google.com CREATED:20170908T205143Z DESCRIPTION:SPEAKER: Jason Jeffries\, Lawrence Livermore National Laborato ry\n\nTitle: Magnetic Collapse? – probing the limits of magnetism under pre ssure\n\nAbstract: Magnetism in condensed-matter systems drives myriad technological possibilities: from navigation to motors to digital memory. W ith such important implications\, theoretical treatments predicting or desc ribing magnetism have long been pursued. A basic prediction of many magneti c models is that high pressures (of order 1 Mbar\, 1 million times atmosphe ric pressure) should act to collapse the magnetism\, rendering something li ke iron as magnetically innocuous as copper. Therefore\, a valuable test-be d for many theoretical models involves interrogating magnetism under pressu re. While theoretical tools can generally (and sometimes easily!) perturb a system with applied pressure\, the experimental tools to generate pressure and interrogate magnetism are not as straightforward\, and certainly not t rivial. In this presentation\, I will discuss a few magnetic systems that w e have explored\, and describe the tools we have used to examine their magn etism under pressure. In some cases\, magnetism is extremely robust with pr essure\, whereas other forms of magnetism are more strongly suppressed with pressure. Understanding the confines of magnetism in pressure-space should help to improve theoretical descriptions of magnetism.\n\n \nHOST: Nick B utch LAST-MODIFIED:20171027T185015Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Jason Jeffries\, Lawrence Livermore National Labor atory TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180329T180000Z DTEND:20180329T193000Z DTSTAMP:20260828T094430Z UID:3c99b31hgv24603pu2mq6cothc@google.com CREATED:20180312T190812Z DESCRIPTION:Speaker: Zachary Geballe\, Carnegie Geophysical Lab

Tit le: Thermodynamics of melting\, freezing and glass formation at high pressure


Abstract: Melting\, freezing\, and glass formation at high pressures cause dramatic chan ges inside the Earth and are key steps in the synthesis certain exot ic materials. Experimental characterization of these order-di sorder transformations remains a challenge at high pressures. I will introduce new high-pressure dynamic heating techniques that open up many opportunities to study such transformations. Usi ng these technique\, we have constrained the heat capacity and therm al conductivity across a variety of order-disorder transition s in high-pressure H2O\, detected melting and free zing of platinum at high pressure\, and synthesized metal hyd rides that may have high superconducting transition temperatures. We synthesized palladium hydride with variable hydrogen content\, and LaH~10 in a cubic structure whose TC is predicted to be ~280 K at 200 GPa of pressure. The next step is to make transport measurements in order to determine Tc as a function of magnetic field and pressure. LAST-MODIFIED:20180312T190812Z LOCATION:Room 1201\, John S Toll Bldg.\, Refreshments in Toll room 1117 at 1:30 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Zach Geballe\, Carnegie Geophysical Lab TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170810T170000Z DTEND:20170810T173000Z DTSTAMP:20260828T094430Z UID:uctq6buncs7brm75ollfo15uhk@google.com CREATED:20170724T140134Z DESCRIPTION:Speaker: Justin Yirka\n\nSpeaker Affiliation: Virginia Commonwe alth University\n\nTitle: Pure state tomography with Pauli observables\n\nA bstract: Pure-state tomography requires expectation values on the order of the system’s dimension\, a quadratic improvement compared to general tomogr aphy. We seek to understand the number of expectation values necessary to u niquely determine all pure states\, with the additional restriction that we consider only the expectation values of Pauli observables. Applying result s from classical computer science\, we reduce this question to an instance of the hypergraph dualization problem\, yielding a conjectured upper bound on the necessary number of expectation values. Our conjecture is conditione d on further understanding the possible linear combinations of Pauli observ ables.\n\nThis is ongoing\, joint work with Jianxin Chen and Amir Kalev. Pa rt of this work was supported by an NSF REU while an undergraduate intern a t QuICS.\n\n*This is a REU Final Presentation for QuICS* LAST-MODIFIED:20170803T145935Z LOCATION:3100A - Large Conference Room (max capacity: 35 people) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160912T190000Z DTEND:20160912T203000Z DTSTAMP:20260828T094430Z UID:65351p5lpr58jsv06tf552abnk@google.com CREATED:20160906T134002Z DESCRIPTION:Speaker Name: Kimberly Boddy\n\nSpeaker Institution: University of Hawaii\n\nTitle: The Impact of Self-Interacting Dark Hydrogen on Struct ure Formation\n\nAbstract: The standard cosmological model with collisionle ss\, cold dark matter (CDM) is remarkably successful in describing the obse rved large-scale structure of the Universe\; however\, on small scales rang ing from dwarf spheroidal galaxies to galaxy clusters\, dark matter halos h ave more cored profiles with lower central densities than those generated b y simulations. An attractive solution to these anomalies is to modify predi ctions of small-scale structure through dark matter self-interactions. I wi ll discuss a particular model in which dark matter is the analog of hydroge n in a secluded sector. The self-interactions\, which include both elastic scatterings as well as inelastic processes due to a hyperfine transition\, exhibit the right velocity dependence to explain the low dark matter densit y cores seen in spiral galaxies while being consistent with all constraints from observations of clusters of galaxies. Significant cooling losses may occur due to excitations and subsequent decays of the hyperfine state\, whi ch may affect the evolution of low-mass halos and the early growth of black holes. Furthermore\, the interaction between dark matter and dark radiatio n suppresses the matter power spectrum at small scales\, resulting in minim um halo masses that are significantly larger than those typically predicted by CDM. LAST-MODIFIED:20160909T183620Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160425T200000Z DTEND:20160425T210000Z DTSTAMP:20260828T094430Z UID:fcmh8i64roci7uhkrhso52sk7k@google.com CREATED:20160416T221513Z DESCRIPTION:SPEAKER: Arthur F. Hebard\, University of Florida\n\nTITLE: Co nnecting Metals and Semimetals to Semiconductors: The Ubiquity of Schottky Barriers and Tunnel Junctions\n\nABSTRACT: It is widely recognized that i nterfaces between metals and most semiconductors form Schottky barriers wit h rectifying properties that are essential components of present-day electr onics. This talk will begin with a tutorial overview of Schottky barriers a nd describe the physical concepts that are necessary and sufficient to gain a working understanding of their operation. Research will then be describe d which uncovers surprising phenomenology that points to new physics and no vel device concepts. These phenomena include magnetodielectric coupling in nonmagnetic Au/GaAs:Si Schottky barriers\, the formation of Schottky barrie rs at the interface of one-atom-thick zero-gap semiconductors (graphene)\, and the Schottky barriers formed by contacting freshly exfoliated flakes of van der Waals crystals such as Bi2Se3\, a topological insulator\, and laye red chalcogenides to doped Si and GaAs wafers. Interestingly\, modification s to the thermionic emission equation provide an excellent description of c urrent-voltage characteristics at low temperatures where tunneling is known to be important\, thereby providing a segue to a full tunneling descriptio n. Temperature\, frequency and magnetic field dependence of current-voltage and capacitance-voltage characteristics will be described. \n\n\nHOST: Ch ris Lobb LAST-MODIFIED:20160416T221513Z LOCATION:Room 1201 John S Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM CARR COLLOQUIUM: Arthur Hebard\, Univ. of Florida TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161003T173000Z DTEND:20161003T190000Z DTSTAMP:20260828T094430Z UID:l54lpa7c2oeo13e654jk024i04@google.com CREATED:20160926T173423Z DESCRIPTION:***Time change to 1:30pm***\n\nSpeaker: John Terning\n\nSpeaker Institution: UC Davis\n\nTitle: S-Duality and Helicity Amplitudes\n \nAbst ract: I will demonstrate that SL(2\,Z) duality is a property of all low-ene rgy effective Abelian theories with electric or magnetic charges The duali ty will be verified at one loop by comparing the amplitudes in the case of an electron and the dyon that is its SL(2\,Z) image\, and I will show that it can be extended order by order in perturbation theory. I will discuss h ow the duality generically breaks down at high energies\, and show how the results apply to the Seiberg-Witten theory. LAST-MODIFIED:20160930T194357Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar - S-Duality and Helicity Amplitudes TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180411T190000Z DTEND:20180411T200000Z DTSTAMP:20260828T094430Z UID:604qa83radjhq363r9eusnr7bi@google.com CREATED:20180409T134632Z DESCRIPTION:

Speaker: \; \; Prof. Susan Coppersmith

Affiliation : University of Wisconsin - Madison< /p>

Title: \;Building a quantum computer using silicon/silicon-germanium heterostructures

< p>Abstract:

In princ iple\, quantum computers that exploit the nature of quantum physics can sol ve some problems much more efficiently than classical computers can. \; Motivated by the tremendous scalability of classical silicon electronics\, we are working to build a large-scale quantum computer using silicon/silic on-germanium quantum dots\, constructed using technology similar to that us ed to build current classical computers. \; This talk will discuss the fundamental physics challenges that arise\, the role that theory has played in addressing these challenges\, the experimental progress that has been m ade\, and the prospects for further development.

LAST-MODIFIED:20180409T134632Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180502T170000Z DTEND:20180502T183000Z DTSTAMP:20260828T094430Z UID:6r3di0229fgj49m46pqrpd7i36@google.com CREATED:20180427T161858Z DESCRIPTION:Speaker: Yiming Cai\n \nSpeaker Institution: University of Mary land\n \nTitle: QED-corrected Lellouch-Luescher formula for K->\\pi\\pi dec ay\n\nAbstract: A precise Standard Model prediction for the direct CP viola tion in the K -> \\pi\\pi decay process is of great importance in confronti ng experiments and constraining new physics. The state-of-art lattice QCD p recision of this process will soon achieve a value for which QED effects ca n no longer be neglected. The inclusion of QED in such calculations is plan ned and the formalism to relate the finite-volume matrix element obtained f rom these calculations to the physical amplitude is underway. Here we prese nt preliminary results on the extension of Lellouch-Luscher formula in pres ence of QED\, therefore providing such formalism for the extraction of phys ical amplitudes for the K->\\pi\\pi process with charged initial and/or fin al states. LAST-MODIFIED:20180427T172505Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180222T123000 DTEND;TZID=America/New_York:20180222T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180222T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Victor Galitski\nUMD Physics\nTitle: Classical-to-quan tum correspondence and transitions in chaotic dynamics of out-of-time-order ed correlators\nAbstract: One of the most intriguing phenomena in the studi es of classical chaos is the butterfly effect\, which manifests itself in t hat small changes in initial conditions lead to drastically different traje ctories. It is characterized by a Lyapunov exponent that measures divergenc e of the classical trajectories. The question how/if this prototypical effe ct of classical chaos theory generalizes to quantum systems (where the noti on of a trajectory is undefined) has been of interest for decades\, but bec ame more popular recently\, when it was realized that there exist intriguin g connections to string theory and general relativity in some quantum chaot ic models. At the center of this activity is the so-called out-of-time-orde red correlator (OTOC) - a quantity that in the classical limit seems to app roximate the classical Lyapunov correlator. In this talk\, I will discuss the connection between the standard Wigner-Dyson approach to "quantum chaos " and that based on the OTOC on the example of a chaotic billiard and a dis ordered interacting electron system (i.e.\, a metal). I will also consider the standard model of quantum and classical chaos - kicked rotor - and calc ulate the correlator and Lyapunov exponents. The focus will be on how class ical chaos and Lyapunov divergence develop in the OTOC and cross-over to th e quantum regime. We will see that the quantum out-of-time-ordered correlat or exhibits a clear singularity at the Ehrenfest time\, when quantum interf erence effects sharply kick in: transitioning from a time-independent value to its monotonous decrease with time. In conclusion\, I will discuss many- body generalizations of such quantum chaotic models. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170214T190000Z DTEND:20170214T203000Z DTSTAMP:20260828T094430Z UID:9e6d9elg1029sn87d940u8cdn8@google.com CREATED:20170206T152232Z DESCRIPTION:Speaker: Zohreh Davoudi\n\nSpeaker Institution: MIT\n\nTitle: T he Road to Nuclear Physics from Standard Model\n\nAbstract: At the core of nuclear physics is to understand complex phenomena occurring in the hottest and densest known environments in nature to unravel the mystery of the Dar k sector and other new physics possibilities. Nuclear physicists are expect ed to predict\, with certainty\, the reaction rates relevant to star evolut ions and nuclear energy research\, and to obtain the “standard” effects in nuclei to reveal information about the “non-standard” sector. To achieve su ch certainty\, the field has gradually started to eliminate its reliance on the phenomenological models and has entered an era where the underlying in teractions are "effectively" based on the Standard Model of particle physic s\, in particular Quantum Chromodynamics (QCD). The few-nucleon systems can now emerge directly from the constituent quark and gluon degrees of freedo m and with only QCD interactions in play\, using the numerical method of la ttice QCD. Few-body observable\, such as few-nucleon interactions and scatt ering amplitudes\, as well transition amplitudes and reaction rates\, have been the focus of this vastly growing field\, as once obtained from QCD\, a nd matched to effective field theories\, can advance and improve the nuclea r many-body calculations of exceedingly complex systems. This talk is a bri ef introduction to this program and its goals\, with a great focus on the p rogress in few-body observables from QCD. LAST-MODIFIED:20170206T154008Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160901T193000Z DTEND:20160901T203000Z DTSTAMP:20260828T094430Z UID:taq3pr6uvth5t87c57gjr1bqao@google.com CREATED:20160829T131353Z DESCRIPTION:Discussion of topics for Fall 2016 LAST-MODIFIED:20160829T131353Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Organizational meeting TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170502T150000Z DTEND:20170502T161500Z DTSTAMP:20260828T094430Z UID:1s06brgo89psdgeiq2ipheoosc@google.com CREATED:20170306T225449Z DESCRIPTION:Speaker: Robert Konik (Brookhaven National Laboratory)\n\nTitle : Studies of the Loschmidt Echo and Entanglement Spreading in Two Dimension al Anisotropic Spin Systems\n\nAbstract: We describe a method for simulatin g the real time evolution of extended quantum systems in two dimensions. Th e method combines the benefits of integrability and matrix product states i n one dimension. In particular it can be extended to systems whose geometry is that of an infinitely long cylinder. As a first example application\, w e present results for quantum quenches in arrays of coupled quantum Ising c hains. In quenches that cross a phase boundary we find that the return prob ability shows non-analyticities in time. We also consider how entanglement spreads post-quench in the array of chains. We see notable differences in the spreading on whether the chains are in their ordered or disordered pha se. This difference arises because of the presence of linearly confined bo und states in the ordered phase. As a second example application\, we cons ider entanglement spreading in anisotropic two dimensional Heisenberg model s.\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Victor Galitski \n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170413T210946Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160907T200000Z DTEND:20160907T210000Z DTSTAMP:20260828T094430Z UID:hvevu2r5o0lih41elq67rd28bo@google.com CREATED:20160830T173721Z DESCRIPTION:Speaker Name: Dr. Matt Landreman\n\nSpeaker Institution : UMD C ollege Park\n\nTitle : An improved current potential method for fast comput ation of stellarator coil shapes\n\nAbstract : Several fast methods for com puting stellarator coil shapes are compared\, including the classical NESCO IL procedure\, its generalization using truncated singular value decomposit ion\, and a Tikhonov regularization approach we call REGCOIL in which the s quared current density is included in the objective function. Considering W 7-X and NCSX geometries\, and for any desired level of regularization\, we find the REGCOIL approach consistently achieves the lowest surface-averaged and maximum values of both current density (on the coil winding surface) a nd normal magnetic field (on the desired plasma surface). This approach the refore can simultaneously improve the free-boundary reconstruction of the t arget plasma shape while substantially increasing the minimum distances bet ween coils\, improving access for ports and maintenance.\n LAST-MODIFIED:20160830T173903Z LOCATION:ERF 1207 Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170202T203000Z DTEND:20170202T213000Z DTSTAMP:20260828T094430Z UID:5brldk4o3aqmk4l0jooq18jg10@google.com CREATED:20170127T180620Z DESCRIPTION:Speaker: Jonathan Rosenberg (UMd) - http://www.math.umd.edu/~jm r/ \nAbstract: We will start with some of the first topics in the book "Dir ichlet Branes and Mirror Symmetry"\, http://bookstore.ams.org/cmim-4 . The preface and Chapter 1 can be downloaded for free from the AMS website. Ch apter 2 is at arXiv:hep-th/0609042 LAST-MODIFIED:20170127T180620Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:introduction to the book "Dirichlet Branes and Mirror Symmetry" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170427T163000Z DTEND:20170427T173000Z DTSTAMP:20260828T094430Z UID:thmntrmjnnpdk65g68letptcp0@google.com CREATED:20170223T153959Z DESCRIPTION:Speaker Name: Doug Durian\n\nSpeaker Institution: Department o f Physics - University of Pennsylvania\n\nTitle: Dynamics of Granular Clog ging\n\nAbstract: The gravity-driven flow of grains from a hole in a hopper is an iconic granular phenomenon. It’s different from a fluid in that the rate is constant also in that it can suddenly and unexpectedly clog. How does the the susceptibility to clogging decrease with increasing hole size\ , and is there a well-defined clogging transition above which the system ne ver clogs? This problem is distinct from jamming due to presence of bounda ries and gradients. We show how the fraction F of flow configurations tha t cause a clog may be deduced from the average mass discharged between clog s. We construct a simple model to account for the observation that F decay s exponentially in hole width to the power of dimensionality. Thus the clog ging transition is not sharp but rather is defined by observation limits si milar to the glass transition. When the system is immersed in water\, F ba rely changes. Therefore\, the crucial microscopic variables are the grain positions\; grain momenta play only a secondary role in destabilizing weak incipient arches. There is also a surprising effect whereby the discharge causes water to be pumped downwards\, faster than the grains. LAST-MODIFIED:20170223T153959Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170404T150000Z DTEND:20170404T161500Z DTSTAMP:20260828T094430Z UID:hmnbv1ugmap9b4bil6tghsuj70@google.com CREATED:20170109T170147Z DESCRIPTION:Speaker: Roger Melko (University of Waterloo)\n\nTitle: Machine Learning the Many-Body Problem\n\nAbstract: Condensed matter physics is th e study of the collective behavior of infinitely complex assemblies of elec trons\, nuclei\, magnetic moments\, atoms or qubits. This complexity is rem iniscent of the “curse of dimensionality” commonly encountered in machine l earning. Despite this curse\, the machine learning community has developed techniques with remarkable abilities to classify\, characterize and interp ret complex sets of data\, such as images and natural language recordings. Here\, we show that modern architectures for supervised learning\, such as fully-connected and convolutional neural networks\, can identify phases and phase transitions in a variety of condensed matter Hamiltonians. Readily p rogrammable through open-source software libraries\, neural networks can be trained to detect multiple types of order parameter\, as well as highly no n-trivial states with no conventional order\, directly from raw state confi gurations sampled with standard Monte Carlo. Further\, Monte Carlo configu rations can be used to train a stochastic variant of a neural network\, cal led a Restricted Boltzmann Machine (RBM)\, for use in unsupervised learning applications. We show how RBMs\, once trained\, can be sampled much like a physical Hamiltonian to produce configurations useful for estimating phys ical observables. Finally\, we explore the representational power of RBMs\, their role in deep learning\, and its possible relationship to the renorma lization group.\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Do ng-Ling Deng\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170317T181910Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180323T230000Z DTEND:20180324T003000Z DTSTAMP:20260828T094430Z UID:6rd5olm037f5df67bt26qkhrh7@google.com CREATED:20180219T165612Z DESCRIPTION:Physics is Phun Community Event
Program offered both Friday 3/23 and Saturday 3/24 at 7:00 pm.

https://umdphysics.umd.edu/events/about us-outreach/physics-is-phun.html

For information: lecdemo_outreach@physic s.umd.edu LAST-MODIFIED:20180316T202703Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics is Phun: The Physics of Radiation in Three Acts TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160412T171500Z DTEND:20160412T181500Z DTSTAMP:20260828T094430Z UID:ud4ted8g9qudr4fdime64ghaio@google.com CREATED:20160331T155319Z DESCRIPTION:Speaker Name: Professor Daniel Lathrop\n\nSpeaker Institution: University of Maryland\, College Park\n\nTitle: Mobile vortices in superflu ids and superconductors: are there liquid superconductors?\n\nAbstract: Muc h is known about the dynamics of quantized vortices in superfluids and magn etic vortices in type II superconductors. While no known liquid has superco nductivity\, that is not ruled out by current theory. We could easily miss possible superconductivity in a liquid if the magnetic vortices were entire ly mobile and easy to nucleate. Those materials may show electrically resis tivity\, even though they might have a non-zero order parameter. I'll appro ach this problem by first covering the basics of vortices in the two system s and then speculate on measurement techniques that could be used to detect possible but unknown new superconducting liquid phases. LAST-MODIFIED:20160411T134211Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160622T150000Z DTEND:20160622T160000Z DTSTAMP:20260828T094430Z UID:8vb10sifkc4kebjjad0g01ohs8@google.com CREATED:20160606T162009Z DESCRIPTION:Speaker Name: Gorjan Alagic\n\nSpeaker Affiliation: University of Copenhagen\n\nTitle: How to encrypt a quantum state\n\nAbstract: Encrypt ion of classical data is ubiquitous in everyday life. As quantum computatio n and communication gains wider use\, encryption of quantum data is likely to become important as well. Until recently\, the theory of quantum encrypt ion was fairly limited\, consisting primarily of the quantum analogue of th e one-time pad. In this talk\, I will discuss how to place quantum encrypti on on the same foundations as classical encryption\, and how to translate m any of the great achievements of classical encryption theory to the quantum setting. This includes quantum encryption schemes which satisfy a natural notion of semantic security against chosen-plaintext and non-adaptive chose n-ciphertext attacks. I will briefly mention applications of these schemes to impossibility proofs for quantum black-box obfuscation. Finally\, I will discuss how to make these quantum encryption schemes immune to forgery\, m anipulation of ciphertexts\, and adaptive chosen-ciphertext attacks. The ta lk is based on several joint works\, with collaborators A. Broadbent\, B. F efferman\, T. Gagliardoni\, C. Schaffner and M. St. Jules. LAST-MODIFIED:20160617T152327Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170728T200000Z DTEND:20170728T210000Z DTSTAMP:20260828T094430Z UID:kkv7379lu1ov85pclng8cmrvv0@google.com CREATED:20170719T183153Z DESCRIPTION:Speaker: Yunseong Nam\n\nInstitution: IonQ inc.\, QuICS\, UMIAC S\n\nTitle: Toward a full software stack for the quantum computing platform \n\nAbstract: With commercial quantum computers on the rise\, the developme nt of a full software stack that will support the quantum computing platfor m is becoming increasingly important. In this talk\, I will provide an over view of several key ingredients of the stack\, addressing simulation\, circ uit optimization\, circuit placement\, and native gate set. Some future wor ks will be discussed towards the end of the talk. No prior knowledge of the subject is required\n\n(The JQI summer school is for students and postdocs \, but others are welcome to join for refreshments and snacks afterward\; D iscussion with refreshments and snacks at 5:00 pm) LAST-MODIFIED:20170719T183153Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180913T180000Z DTEND:20180913T193000Z DTSTAMP:20260828T094430Z UID:30umfns057bpjn7b8dpou30kc2@google.com CREATED:20180823T192700Z DESCRIPTION:Title: Samarium hexaboride\, curiouser and curiouser! \n\nSpeak er: Wesley Fuhrman\, University of Maryland\n\nAbstract: A cornerstone of c ondensed matter\, the history of SmB6 is punctuated with seeming paradoxes. I will first discuss the “missing” Sm3+ magnetism as related to the spin e xciton seen by neutron scattering. This mode exemplifies the strong correla tions which make SmB6 exceptional among the growing zoo of topological mate rials. Then\, I will describe the unusual behavior of magnetic impurities i n SmB6 as evidenced by recent results in XMCD\, neutron scattering\, and ma gneto-thermal measurements. The moment screening we observe establishes a c onnection in SmB6 between common impurities and bulk metal-like properties\ , potentially related to recent curiosities such as bulk quantum oscillatio ns found in the absence of both DC conductivity and fermionic thermal carri ers. \n\nHost: (local) LAST-MODIFIED:20180905T194242Z LOCATION:Rm 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Wesley Fuhrman\, University of Maryland TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180501T171500Z DTEND:20180501T181500Z DTSTAMP:20260828T094430Z UID:2fr8tjnrqu6fsi3l7ucpcibcla@google.com CREATED:20180417T135359Z DESCRIPTION:Speaker: Dr. Albert Pan\, D.E. Shaw Research

Title: Usin g Long-Timescale Molecular Dynamics Simulations to Benchmark Enhanced Sampl ing Methods

Abstract: \;All-atom molecular dynamics (MD) simulation is a valuable technique for providing detailed information about the dynamics of biomolecules\, but its computational expense can oft en be prohibitive. This limitation has motivated the development of "enhanc ed sampling" simulation methods - purely algorithmic changes to conventiona l MD that aim to accelerate the sampling of configurational states. Althoug h many such methods are available\, relatively few systematic studies of th eir performance have been done. Quantitative claims about the performance o f enhanced sampling simulations are typically limited to (i) comparisons wi th conventional MD simulations of small\, model systems\, which may present qualitatively different sampling challenges than complex biological system s\, or (ii) comparisons with experimental data\, which may be complicated b y discrepancies between the actual experimental conditions and the modeling of those experimental conditions in the enhanced sampling simulation\, inc luding errors in the physical model\, or force field\, used in simulation. An effective alternative approach to quantifying performance of enhanced sa mpling methods would be to compare the results they obtain on complex biolo gical systems directly to those obtained by conventional MD simulations usi ng the same force field. Here\, we use long-timescale conventional MD simul ations to assess the performance of certain commonly used enhanced sampling methods in accelerating the sampling of protein conformational changes\, p rotein folding\, and ligand binding. \; LAST-MODIFIED:20180425T192121Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180223T210000Z DTEND:20180223T214000Z DTSTAMP:20260828T094430Z UID:4iepeb0ldclv0up1336ujnkhip@google.com CREATED:20180214T161553Z DESCRIPTION:Speaker Name: Thomas Iadecola\n\nSpeaker Institution: JQI and C MTC\n\nTitle: Floquet Supersymmetry \n\nAbstract: We show that time-reflect ion symmetry in periodically driven (Floquet) quantum systems enables an in herently nonequilibrium phenomenon structurally similar to quantum-mechanic al sypersymmetry. In particular\, we find Floquet analogues of the Witten i ndex that place lower bounds on the degeneracies of states with quasienergi es 0 and π. We provide a simple class of disordered\, interacting\, and erg odic Floquet models with an exponentially large number of states at quasien ergies 0\,π\, which are robust as long as the time-reflection symmetry is p reserved. Floquet supersymmetry manifests itself in the evolution of certai n local observables as a period-doubling effect with dramatic finite-size s caling\, providing a clear signature for experiments.\n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180219T194746Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171009T190000Z DTEND:20171009T203000Z DTSTAMP:20260828T094430Z UID:53j88j0c4q97e8mknsifu9m9ma@google.com CREATED:20171002T173405Z DESCRIPTION:Speaker: Simon Knapen\n\nSpeaker Institution: Berkeley Lab\n\nT itle: Searching for long-lived particles with ATLAS\, CMS and LHCb\n \nAbst ract: In the first part of the talk I will show how to find non-helical tra cks from underneath the pile-up background. The second part will be devoted CODEX-b\; a proposal for a new detector for long-lived particles in the LH Cb cavern. LAST-MODIFIED:20171002T173405Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160411T203000Z DTEND:20160411T213000Z DTSTAMP:20260828T094430Z UID:8ald87t921kd7f6i90qt9phgv0@google.com CREATED:20160407T132934Z DESCRIPTION:Speaker Name: Terri Brandt \n\nSpeaker Institution : NASA GSFC\ n\nTitle : Galactic Cosmic Rays: From Earth to Sources\n\nAbstract : For ov er 100 years we have known that cosmic rays come from outer space\, yet pro of of their origin\, as well as a comprehensive understanding of their acce leration\, remains elusive. Direct detection of high energy (up to 10^15eV) \, charged nuclei with experiments such as the balloon-born\, antarctic Tra ns-Iron Galactic Element Recorder (TIGER) and the recently flown SuperTIGER have provided insight into these mysteries through measurements of cosmic ray abundances. The abundance of rare heavy elements with respect to certai n intrinsic properties suggests that cosmic rays include a component of mas sive star ejecta. Supernovae and their remnants (SNe & SNRs)\, often occurr ing at the end of a massive star's life or in an environment including mass ive star material\, are one of the most likely candidates for sources accel erating galactic comic ray nuclei up to the requisite high energies. The Fe rmi Gamma-ray Space Telescope Large Area Detector (Fermi LAT) has improved our understanding of such sources by widening the window of observable ener gies and thus our view into potential sources' energetic processes. Since F ermi LAT surveys the whole sky\, we have created the first systematic study of GeV emission in all regions containing known SNRs. Not only does this c atalog\, in combination with the wealth of multiwavelength data available\, allow us to constrain SNRs' ability to accelerate cosmic rays\, but it als o provides statistically-motivated insight into the inner workings of GeV-e mitting SNRs.\nNotes: http://space.umd.edu/seminars/showAbstract/0411161630 LAST-MODIFIED:20160407T133053Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180423T200000Z DTEND:20180423T213000Z DTSTAMP:20260828T094430Z UID:363h19nk3cijfvnqikn09kpuin@google.com CREATED:20180418T120450Z DESCRIPTION:\nSpeaker: Tomer Volansky\n\nSpeaker Institution: Tel Aviv Univ ersity and Institute for Advanced Study\, Princeton University\n\n\nTitle: Recent Results from the Light Dark Matter Frontier\n\nAbstract: The existen ce of dark matter has been well established with overwhelming evidence\, bu t its particle identity is still unknown. For more than three decades\, sig nificant theoretical and experimental efforts have been directed towards th e search for a Weakly Interacting Massive Particle (WIMP)\, often overlooki ng other possibilities. The lack of an unambiguous positive WIMP signal\, a t both indirect- and direct-detection experiments and at the LHC\, stresses the need to expand dark matter research into additional theoretical scenar ios and\, more importantly\, to develop new experimental capabilities that go beyond the limitations of WIMP detection. In this talk I will report on new theoretical\, observational and experimental results related to light dark matter in the keV to GeV mass range\, including a new direct detection experiment called SENSEI and the interpretation of the recent global 21cm measurement. LAST-MODIFIED:20180419T131446Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171025T150000Z DTEND:20171025T160000Z DTSTAMP:20260828T094430Z UID:1gqtpijn2i6k251i68l8qouben@google.com CREATED:20171018T140956Z DESCRIPTION:Speaker: Dr. Ruhong Zhou\, IBM Watson Research Center\, Columbi a University\n\nTitle: HIV Vaccine Development: Binding Free Energy of TCR/ peptide/HLA Complexes\n\nAbstract: The design and development of HIV vaccin es has been of great interest in recent years due to the wide spread infect ion of AIDS\, with more than 34 million individuals in the world living wit h HIV. Immune control of viral infections is modulated by diverse T cell re ceptor (TCR) clonotypes engaging peptide-HLA class I complexes on infected cells\, but the relationship between their structure and antiviral function is largely unclear. In this talk\, I will describe some of our recent work s on this critical HIV/AIDS vaccine development through collaborative effor ts. With a combined in silico and in vivo approach\, we studied the TCR/pep tide/HLA interactions from multiple clonotypes specific for a well-defined HIV-1 epitope\, and found that effective and ineffective clonotypes bind to the terminal portions of the peptide-HLA through similar salt bridges\, bu t their hydrophobic side-chain packings can be very different\, which accou nts for the major part of the differences among these clonotypes. Non-speci fic hydrogen bonding to viral peptide also accommodates greater epitope var iants. Together with state-of-the-art free energy perturbation calculations for point mutations on viral peptide\, our results clearly indicate a dire ct structural basis for heterogeneous T cell antiviral function. Meanwhile\ , we also sought to understand the mechanisms by which natural killer (NK) cells recognize HIV-1-infected cells and how this virus can evade NK cell-m ediated immune pressure. Two sequence mutations (in p24 Gag) were identifie d in a large cohort of untreated HIV-1 clade C-infected individuals from So uth Africa (N=392)\, suggesting viral escape from NK cells through sequence variations within HLA class I-presented epitopes. Again\, our structural m odeling and surface plasmon resonance experiments of KIR/peptide/HLA comple xes revealed the underlying molecular mechanisms governing the three way co mplex interaction and recognition. Future studies will be needed to assess processing and antigen presentation of the investigated HIV-1 epitope in na tural infection\, and the consequences for viral control. LAST-MODIFIED:20171018T141620Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161109T160000Z DTEND:20161109T170000Z DTSTAMP:20260828T094430Z UID:bpelmg4jlg4ogtuv0ja3ur2rtc@google.com CREATED:20160808T200317Z DESCRIPTION:Speaker: Earl Campbell\n\nSpeaker Affiliation: University of Sh effield\n\nTitle: Unifying gate-synthesis and magic state distillation\n\nA bstract: The leading paradigm for performing computation on quantum memorie s can be encapsulated as distill-then-synthesize. Initially\, one performs several rounds of distillation to create high-fidelity magic states that pr ovide one good T-gate\, an essential quantum logic gate. Subsequently\, gat e synthesis intersperses many T-gates with Clifford gates to realise a desi red circuit. We introduce a unified framework that implements one round of distillation and multi-qubit gate synthesis in a single step. Typically\, o ur method uses the same number of T-gates as conventional synthesis\, but w ith the added benefit of quadratic error suppression. Because of this\, one less round of magic state distillation needs to be performed\, leading to significant resource savings. This new perspective also led us towards new efficient algorithms for reducing the T-count in this family of multi-qubi t circuits.\n\narXiv:1606.01906 and arXiv:1606.01904 LAST-MODIFIED:20161028T172612Z LOCATION:3100A Computer and Space Science Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171030T190000Z DTEND:20171030T203000Z DTSTAMP:20260828T094430Z UID:41a2hmpohssmn2e7nqp0rq57en@google.com CREATED:20171020T131101Z DESCRIPTION:Speaker: Soubhik Kumar\n\nSpeaker Institution: University of Ma ryland\n\nTitle: Heavy-Lifting of Gauge Theories by Cosmic Inflation\n \nAb stract: Future measurements of primordial non-Gaussianity (NG) can reveal t he existence of cosmologically produced particles with masses of order the inflationary Hubble scale which can be as high as 10^13 GeV. In this talk i t will be described how (partially) Higgsed gauge theories having such part icles can leave observable signatures in future NG measurements giving us a chance to do a spectroscopy of their masses and spins. In particular\, a “ heavy-lifting” mechanism will be analyzed in which couplings to curvature c an result in Higgs scales of order the Hubble scale during inflation while reducing to far lower scales in the current era\, where they may now be ac cessible to collider and other laboratory experiments. Such a mechanism is testable in the sense that renormalization-group running of terrestrial mea surements can yield predictions for cosmological NG. LAST-MODIFIED:20171023T163636Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180508T160000 DTEND;TZID=America/New_York:20180508T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180508T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Rudolf Tromp\n\nSpeaker Institution: IBM\n\nTitle : So you have a degree in Science. Now what?\n\nAbstract: Students (undergr aduate and graduate)\, as well as postdoctoral researchers\, are usually em bedded in an academic environment\, working with or for a professor with ex tensive research experience. This professor will naturally be a role model\ , and many students aspire to also become a university professor and spend their careers in academia. But reality is different: the vast majority of p hysics students will not end up in academia\, and will not end up spending their careers doing research. Even more\, research in industry has sharply declined over the last 20 years. So what is a fresh graduate to expect\, an d what career options are available to her? In this (hopefully interactive) talk I will discuss how a degree in science provides a starting point for addressing a variety of societal grand challenges in a broad range of profe ssional settings.\n\n\nHosted by: Ichiro Takeuchi LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170216T203000Z DTEND:20170216T213000Z DTSTAMP:20260828T094430Z UID:6kltair5nns9h19ak4jvta7f3o@google.com CREATED:20170214T160059Z DESCRIPTION:Speaker: David Pincus (UMd) \nAbstract: We will start on chapte r 3 of the book "Dirichlet Branes and Mirror Symmetry"\, http://bookstore.a ms.org/cmim-4 . You can get the whole book in electronic form from http:// claymath.org/publications/online-books . LAST-MODIFIED:20170214T160059Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Supersymmetric quantum mechanics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171121T181500Z DTEND:20171121T191500Z DTSTAMP:20260828T094430Z UID:2eki170o3t664lgsnqe2qlp1nk@google.com CREATED:20170912T134842Z DESCRIPTION:Speaker: Professor Mikhail Anisimov\, UMCP\n\nTitle: Fluid Poly morphism: From Superfluid Helium to Metallic Hydrogen\n\nAbstract: Fluid po lymorphism is a surprisingly ubiquitous\, yet poorly understood\, phenomeno n in condensed matter. It is either found or predicted\, often at extreme c onditions\, for a broad group of very different substances\, including\, bu t not limited to\, helium\, carbon\, silicon\, phosphorous\, sulfur\, ceriu m\, and hydrogen. This phenomenon is also hypothesized for metastable and d eeply supercooled water\, presumably located a few degrees below the experi mental limit of homogeneous ice formation. A generic phenomenological appro ach based on the Landau theory of phase transitions and on the concept of i nterconversion of alternative molecular or supramolecular states\, unifies all the controversial examples of fluid polymorphism with or without phase separation. \n\n LAST-MODIFIED:20171108T143802Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180614T200000Z DTEND:20180614T210000Z DTSTAMP:20260828T094430Z UID:0spsn8ql38k10p5gu7ido23umg@google.com CREATED:20180612T164644Z DESCRIPTION:Speaker Name: A. Gopakumar\n\n\nSpeaker Institution : Departmen t of Astronomy and Astrophysics\, Tata Institute of Fundamental Research\, Mumbai\n\nTitle: Blazar OJ287 and its nano-Hertz GW emitting massive BH bi nary central engine\n\nAbstract : Blazars are active galactic nuclei with s trong jets. They tend to exhibit dramatic and unpredictable flux variations \, namely outbursts. Certain observed outbursts from an exceptional Blazar OJ287 can be explained by invoking a massive black hole binary as its centr al engine. Detailed General Relativistic modeling allowed us to predict a m ajor optical outburst during November 2015. The outburst did occur within t he expected time range\, peaking on 5/12/2015. A multi-wavelength observati onal campaign confirmed the occurrence of certain impact flare and the pres ence of a major thermal component in the flare\, as predicted. These observ ations and subsequent analysis allowed us to establish the presence of a sp inning supermassive black hole binary that spirals in due to the emission o f nano-Hertz gravitational waves in the central engine of OJ287. I will bri efly list our on-going efforts that should be interesting to the Event Hori zon Telescope consortium and the International Pulsar Timing Array. LAST-MODIFIED:20180612T164917Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161031T200000Z DTEND:20161031T213000Z DTSTAMP:20260828T094430Z UID:3ltj1e3jarg580hcifedt39uvk@google.com CREATED:20161025T152628Z DESCRIPTION:Speaker: Virginia Trimble\, professor of physics and astronomy at the University of California\, Irvine. She was a visiting professor of a stronomy at UMD from 1973 to 2003. She is also the widow of Joseph Weber\, a pioneer in the search for gravitational waves who was a physics professor at UMD from 1961 until his retirement.\n\nAbstract: "Gosh\, Prof. Trimble\ , Do You Really Remember Before Gravars?" This question derives from the la st paragraph of a 1987 article Trimble wrote\, at the editor's request\, fo r Sky & Telescope. It is a good "vantage year\," coming 28 years before the first report from the Laser Interferometer Gravitational-Wave Observatory (LIGO) and 28 years after the late Joseph Weber\, who was a UMD physics pro fessor\, started talking in public about building a detector for gravitatio nal waves/radiation. Earlier landmarks were papers by Poincare\, Einstein a nd others saying that gravitational information must travel in wave form\, to tell nearby masses how to react to changing quadrupole moments of masses in their vicinity. Curiously\, it took many years before all the expert gr avitation physicists could agree that such waves actually carried energy. E arly "yes" votes included Weber & Wheeler in 1957\, and the last mainstream opponent (until his death) was Leopold Infeld. Remarkably\, the LIGO annou ncement brought at least two remaining doubters (from Italy) out of the hay stack (the one in which you look for needles). This presentation will inclu de some melange of the theoretical debates and the first designs and constr uction of laboratory detectors.\n\n LAST-MODIFIED:20161028T134515Z LOCATION:PSC 2136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Dean's Colloquium: Some Words\, A Few Pictures & One Equation About the First Searches for Gravitational Waves TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180924T200000Z DTEND:20180924T210000Z DTSTAMP:20260828T094430Z UID:2iq315com5cngokr32ro5p5s4n@google.com CREATED:20180829T190410Z DESCRIPTION:Title : Transcriptional Enhancers – Looking out for the genes a nd each other\n\nSpeaker: Sridhar Hannenhalli\, University of Maryland at C ollege Park\n\nNotes: http://www.marylandbiophysics.umd.edu/seminars/\nAbst ract : The ENCODE project\, via generation of unprecedented transcriptomic and epigenomic profiles\, has revealed a complex layer of transcriptional r egulation mediated by distal regulatory enhancers distributed throughout th e human genome. These data open up more questions than they answer. We will discuss their nuclear organization\, how they can be used for better genot ype-phenotype associations and their potential emergent properties by virtu e of their spatial proximity. LAST-MODIFIED:20180921T140141Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161010T200000Z DTEND:20161010T210000Z DTSTAMP:20260828T094430Z UID:i9nu0e3370dsf6ridtof0nds34@google.com CREATED:20161007T140434Z DESCRIPTION:Speaker Name: Dr. Jose Feijo \n\nSpeaker Institution:Universit y of Maryland College Park\n\nTitle: Excitement on non-excitable cells: gl utamate-like receptors and calcium homeostasis in plant cells\n\n LAST-MODIFIED:20161007T143051Z LOCATION:Marker Seminar Room (0112)\, Chemistry Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170421T153000Z DTEND:20170421T213000Z DTSTAMP:20260828T094430Z UID:n7s2s5j5ai4ba6uujbsi1udsg4@google.com CREATED:20170412T162911Z DESCRIPTION:11:30AM - 5:30 PM. Talks and poster sessions in\nsupport of GRA D-MAP’s mission for inclusive science. \n LAST-MODIFIED:20170412T162911Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:GRAD-MAP Spring Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170209T173000Z DTEND:20170209T183000Z DTSTAMP:20260828T094430Z UID:sq4cfhhct0ka2q2ma2ue9t1uqg@google.com CREATED:20170207T142916Z DESCRIPTION:Propagation of ultrashort laser pulses through atmospheric turb ulence/PHYS798E*\n\n*Problems in Advanced Physics\; Electrophysics*\n\n*PHY S 798E and ENEE 698D*\n\nDr. Joseph Penano\,* *Naval Research Laboratory*\n \n*ABSTRACT:* The propagation of short\, intense laser pulses in the\natmos phere is rich in fundamental physics and potential applications. At\nthe su b-picosecond pulse durations and high laser powers involved\n(>gigawatts)\, a number of interesting linear and nonlinear effects come\ninto play\, e.g .\, dispersion\, nonlinear self-focusing\, multiphoton and\ntunneling ioniz ation\, and spectral broadening among others. In addition\,\natmospheric tu rbulence can either enhance or suppress laser filamentation\,\nwhile nonlin ear self-focusing can break reciprocity (symmetry with respect\nto the inte rchange of point sources and receivers*)*\, which is the guiding\nprincipal behind conventional adaptive optics methods for turbulence\nmitigation. Th is talk discusses the basic physics of nonlinear laser\npropagation through turbulence\, and the ongoing work in this area at the\nNaval Research Labo ratory.\n\n*BIO*: Dr. Joseph Penano is a Research Scientist at the Naval Re search\nLaboratory and heads the Beam Physics of the Plasma Physics Divisio n. He\nreceived his Ph.D. in Plasma Physics from UCLA in 1998. His research covers\na wide range of fields including the atmospheric propagation of hi gh-energy\nand high-power lasers\, ultra-short pulse laser matter interacti on\,\nnonlinear optics\, and high-power microwave-plasma interactions. He i s the\nrecipient of multiple NRL Featured Research Awards\, Alan Berman Pub lication\nAwards\, the Dolores Etter Top Navy Scientists and Engineers Awar d\, and NRL\nTechnology Transfer Awards for the Incoherently Combined Fiber Laser\nArchitecture and the HELCAP Laser Propagation Simulation.\n LAST-MODIFIED:20170213T154057Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160909T161000Z DTEND:20160909T171000Z DTSTAMP:20260828T094430Z UID:hm0d8evv1tblrogseua93a9t5c@google.com CLASS:PUBLIC CREATED:20160901T174542Z DESCRIPTION:JQI-QuICS-CMTC Seminar \nPrecision phase measurement using 2-mo de squeezed states\nPrasoon Gupta\, JQI\, NIST\nPSC 2136\, Friday\, Septemb er 9\, 2016 - 12:10pm\n\n"In my presentation\, I will talk about precision length\nmeasurement using 2-mode squeezed states. I will discuss several di fferent\nmeasurements that we can perform to beat the standard quantum limi t\n(SQL) for phase measurement using our two-mode squeezed states. The\ntal k will also contain some of our recent data that shows phase\nmeasurements better than the SQL."\n\n(Free lunch served at 12:00pm) LAST-MODIFIED:20160901T174542Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Precision phase measurement using 2-mode squeezed states TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171011T150000Z DTEND:20171011T160000Z DTSTAMP:20260828T094430Z UID:5s83h00tbeprlsds8mbjd13tt6@google.com CREATED:20171005T175252Z LAST-MODIFIED:20171005T175252Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180328T190000Z DTEND:20180328T200000Z DTSTAMP:20260828T094430Z UID:5rgd8f2940697li43qfnljn34a@google.com CREATED:20180327T164923Z DESCRIPTION:

Speaker: \; \; Mitch Narins

Affiliation: Strategic Synergies\, LLC

Abstract< /strong>:

Information technology applications in t he 21st century essential to safety\, efficiency\, effectiveness\, and grow th – for day-to-day and even minute-to-minute operations – have been inextr icably tied to the availability of radio spectrum and information bandwidth . The ability to securely and reliably exchange data and information and to support critical infrastructure applications is limited by the characteris tics of the application’s authorized spectrum (i.e.\, the modulation techni ques a band of frequencies can support) and the environment in which it mus t operate (i.e.\, noise\, multipath\, co-channel/shared services\, etc.). I t is no wonder that spectrum has become so valuable\, with commercial conce rns willing to spend hundreds of millions of dollars and more at Government spectrum auctions for access to even the thinnest slices of the “choicest” frequencies.

 \;

Fr om a data exchange/bandwidth perspective\, some of the most valuable spectr um is found in the L-band – the spread of frequencies extending from 1000 m egahertz (MHz) to 2000 MHz\, where the Global Positioning System (GPS) civi l frequencies (L1 at 1575.42\; L5 at 1176.45 MHz)\, cellular telephone tran smissions (1800-1900 MHz)\, Digital Audio Broadcasting (DAB) (1452-1492 MHz )\, Radio Astronomy (1420 MHz)\, Aviation Secondary Radar/Mode S/Traffic Co llision Avoidance (1030/1090 MHz)\, and Aviation Distance Measuring Equipme nt (DME) and Tactical Navigation (TACAN) (960-1215 MHz) have allocations. I t is this last frequency allocation\, 960-1215 MHz – already designated for use by Aeronautical Radio navigation Services (ARNS)\, which will be the f ocus of this paper’s discussion of the value of a holistic approach to the delivery of communications\, navigation\, and surveillance (CNS) services t o support operation of the US National Airspace System in the 21st century.  \;

 \;

Rather t han continuing to have the proponents of each service vying for use of this spectrum at the expense of the others this paper recognizes the value of f inding a more optimal way of using the spectrum while maintaining the indep endence and integrity of each function. It also recognizes the potential be nefits to future avionic system design that could be achieved through recei ver and antenna system synergies. \;

 \;

Biography:

Mitch Narins is owner and principal consultant for Strategic Synergies\, LLC. \; He recently retired from the FAA where he was the Chief Systems Engineer for N avigation Services and Programs. \; He was named a Fellow of the Royal Institute of Navigation in 2014

LAST-MODIFIED:20180327T164923Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171006T201500Z DTEND:20171006T211500Z DTSTAMP:20260828T094430Z UID:0sq8tebsg8lcn0p45h7v140525@google.com CREATED:20170928T122107Z DESCRIPTION:Speaker: Wenchao Ge\n\nAffiliation: US Army Research Lab and IR EAP\n\nTitle: Distributed Quantum Metrology with Nonclassical States\n\nAbs tract: Quantum metrology explores the benefits of quantum coherence and ent anglement for making precision measurements.\n\nRecently there has been gro wing interest in understanding how quantum metrological techniques can be u sed to enhance measurements that are spatially distributed. In this talk I will first introduce the idea of distributed quantum metrology\, then I wil l discuss the ability of a linear optical network to estimate a linear comb ination of independent phase shifts by using an arbitrary non-classical but unentangled input state. I will show that while linear networks can genera te highly entangled states\, they cannot effectively combine quantum resour ces that are well distributed across multiple modes for the purposes of met rology. Conversely\, I will show that linear networks can achieve the Heise nberg limit for distributed metrology when the input photons are hoarded in a small number of input modes\, thereby elucidating the quantum resources required to obtain the Heisenberg limit with a multi-port interferometer.\n \n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20170928T122107Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T210000Z DTEND:20161130T223000Z DTSTAMP:20260828T094430Z UID:elg2kfjcdf6hfp3c6447cr4nag@google.com CREATED:20161121T151614Z DESCRIPTION:Speaker Name: Larry Gladney\n\nSpeaker Institution : University of Pennsylvania\n \nTitle : "The Physics of the Dark Universe through LSST "\n\nAbstract : The explanations for the origins of dark matter (DM) and da rk energy (DE) constitute two of the chief goals for particle physics and c osmology in the next two decades. A 10-year optical survey of half the sky by the Large Synoptic Survey Telescope (LSST) will produce an unparalleled dataset of billions of galaxies over half the nighttime sky that will give us unprecedented measures of the properties of both DM and DE. Previous ast ronomical measurements have given us compelling evidence for physics beyond the Standard Model\, the best constraints we have on DM and DE and constra ints on several other topics of interest to particle physicists like the nu mber and mases of neutrino species. This talk will cover the major role of US particle physics in LSST and what we hope to learn from the telescopes r ather than accelerators in the next decade. LAST-MODIFIED:20161128T160523Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181011T180000Z DTEND:20181011T193000Z DTSTAMP:20260828T094430Z UID:7l1tnk6hvvorke6050brge45rd@google.com CREATED:20180823T193342Z DESCRIPTION:Title: Probing many-body interactions through excitons in monol ayer transition-metal dichalcogenides\n\n\nSpeaker: Hanan Dery\, University of Rochester\n\nAbstract: \nAdvances in spintronics over the past decade a re largely driven by manifestations of the spin-orbit coupling in crystals with reduced symmetries. In this talk\, I will focus on exciton optical tra nsitions in monolayer transition-metal dichalcogenides. The spin-split ener gy bands in these materials offer unique opportunities to study rich many-b ody physics. After reviewing recent experimental results of the photolumine scence and absorption in gated monolayer WSe2 and MoSe2\, I will explain th e behavior of neutral excitons in the presence of gate-induced\ncharge dens ity. I will then focus on peculiar spectral peaks that emerge at elevated c harge density. These features have no counterparts in typical semiconductor quantum wells. To elucidate their nature\, I will discuss the role of the intervalley Coulomb interaction and its resulting plasma excitations. The i nclusion of this interaction seems to provide a self-consistent explanation for the optical properties in these materials when subjected to strong pho toexcitation or elevated electron densities.\n\nHost: Appelbaum\n\nRefreshm ents Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20180914T150342Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Hanan Dery\, University of Rochester TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170206T210000Z DTEND:20170206T220000Z DTSTAMP:20260828T094430Z UID:9j844jq14jqq8nvldmj1mbrlek@google.com CREATED:20170131T162548Z DESCRIPTION:Speaker Name: Silvina Matysiak\n\nSpeaker Institution : Univers ity of Maryland\n\nTitle : Hydrophobicity Versus Dipole Interactions in Sel f-assembly Processes\n\nAbstract : The delicate balance between hydrophobic ity\, hydrogen bonding and charge interactions determine the self-assembled structure of many biomolecular systems. In this presentation\, a new coars e-grained model to study such delicate balance will be presented. By includ ing polarization effects on a coarse-grained model for proteins and lipid m embranes\, we were able to achieve significant alpha/beta secondary content \, in model proteins\, de novo without any added bias. In addition\, this model allows us to simulate lipid domain formation\, at the molecular level \, in mixed bilayers driven by headgroup interactions for the first time. I n the first part of the talk\, a discussion on how the balance between hydr ophobicity and dipole interactions change to drive peptide folding and aggr egation in aqueous solution and at interfaces will be presented. In the sec ond part of the talk\, a molecular mechanism behind the role of monovalent ion size driving lipid domain formation in mixed zwitterionic-anionic lipid bilayers will also be presented.\n LAST-MODIFIED:20170131T162648Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171116T203000Z DTEND:20171116T220000Z DTSTAMP:20260828T094430Z UID:5mkjtr7ip4iim76sfcp3ro77d1@google.com CREATED:20171113T150631Z DESCRIPTION:Speaker: Matthew Yu (UMD) - \nAbstract: We will introduce the c oncept of a topological field theory\, namely Chern-Simons theory\, and des cribe show how some results of the quantum Hall effect can be derived from the Chern-Simons action. I will be following Tong with some additional rem arks on topological field theories. LAST-MODIFIED:20171113T150631Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The quantum Hall effect from topological field theory TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161207T200000Z DTEND:20161207T210000Z DTSTAMP:20260828T094430Z UID:h7efhphnfmcccubqntlqgi8ek4@google.com CREATED:20161130T223759Z DESCRIPTION:Speaker Name: Dr. Karen Grutter\n\nSpeaker Institution : U.S. A rmy Research Laboratory\n\nTitle : Adding Functionality to Cavity Optomecha nical Systems\n\nAbstract : Coupling between optical and mechanical modes h as enabled a wide variety of interesting potential applications\, including sensors\, mode converters\, reference oscillators\, and quantum systems. I ncreased sensitivity in these systems results from the fact that optical in terferometry is perhaps the most sensitive and high-bandwidth method for re ading out motion\, and cavity optomechanics allows for this to be done in a compact\, stable system. In this talk\, we will explore the optomechanical performance of microrings implemented in a variety of materials\, focusing on their potential as low-phase-noise\, on-chip reference oscillators with electrostatic tuning functionality. We will also present GHz-frequency opt omechanical crystals in stoichiometric silicon nitride\, including techniqu es for improving their optomechanical performance and versatility through d esign and fabrication.\nTitle of Event: \nEdits: LAST-MODIFIED:20161130T224158Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180810T193000Z DTEND:20180810T210000Z DTSTAMP:20260828T094430Z UID:1g7tl287mqv6ki0l8v6ps7hflq@google.com CREATED:20180802T180535Z DESCRIPTION:Speaker: Sona Najafi\, Virginia Tech\n\nTitle: Light cone velo cities and revivals in a quantum spin chain\n\nAbstract: Understanding the nonequilibrium dynamics of many-body quantum systems has become one of the most intriguing problems in condensed matter physics. Here\, we study the s implest paradigm known as the quench problem for a quantum spin chain. One of the most successful descriptions is based on a quasi-particle picture wh ere the maximum group velocity usually are the ones that can be connected t o the saturation of the entanglement entropy or the revivals in the Loschmi dt echo. Here\, we show that in fact\, the quasi-particles with different v elocities can be important. We further show that these effective velocities are strongly dependent on different factors such as parameters of the Hami ltonian\, the initial state and finally\, they depend on to the observable that we study. To this end\, first\, we study the light-cone velocity for g lobal quenches in the XY chain starting from a class of initial states. We point out how translation invariance of the initial state can affect the m aximal speed at which correlations spread in the system and provide analyti c predictions. Analogous considerations are drawn for the evolution of the entanglement entropy and the Loschmidt echo.\n\nNotes: Food and beverages s erved after the talk. LAST-MODIFIED:20180803T200853Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI summer school TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160414T193000Z DTEND:20160414T203000Z DTSTAMP:20260828T094430Z UID:0u5u84m5fdr3bmt9o3msl9opm8@google.com CREATED:20160411T185716Z DESCRIPTION:Speaker: Jonathan Rosenberg (UMd)\nAbstract: I will discuss som e calculations of twisted K-theory for compact Lie groups\nand what this ha s to do with D-brane charges in WZW models and rank-level duality.\nThis is joint work with Mathai Varghese. LAST-MODIFIED:20160411T185716Z LOCATION:Phys 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:D-brane charges in WZW models TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180411T170000Z DTEND:20180411T183000Z DTSTAMP:20260828T094430Z UID:7fn99vb6iakr35nh8ruv135ei5@google.com CREATED:20180118T195050Z DESCRIPTION:Speaker: Mark Mace\n \nSpeaker Institution: Stony Brook Univers ity/Brookhaven National Lab\n \nTitle: Real-time Dynamics of Gauge Theories on the Lattice\n\n Abstract: One of the most outstanding problems in moder n particle and nuclear physics is the study of the real-time\, non-perturba tive dynamics of gauge theories. Sign problems make a first principles desc ription of these systems using conventional methods very challenging. Howev er\, physical situations often allow one to make well-controlled semi-class ical approximations. Focusing on highly over-occupied systems\, the so-call ed classical-statistical (truncated Wigner) approximation can be used\, and a first principles description of the real-time non-perturbative dynamics can be achieved. Employing recently developed real-time lattice gauge theor y simulations\, including dynamical fermions\, we are able to study a diver se array of phenomena. In this talk\, I will first discuss the dynamics of the topological sector of deconfined quark-gluon matter and it’s implicatio ns for searches for anomalous transport phenomena in heavy ion collisions. Then I will proceed to more general applications\, discussing the real-time dynamics of fermions and Schwinger-pair production in both QCD and QED. LAST-MODIFIED:20180405T145250Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170420T173000Z DTEND:20170420T183000Z DTSTAMP:20260828T094430Z UID:7k9v66p8qt64mtjp14uiudu6po@google.com CREATED:20170412T162512Z DESCRIPTION:Hosted by: Women in Physics at UMD\nOpening talk by Gina Quan: “Findings from Studies on Women in Physics”\nAfter the talk: roundtable dis cussion moderated by the UMD Women in Physics.\n\nFlyer: https://drive.goog le.com/file/d/0Bz4x8ufYIK7fX1RKOTJIQWZxNUU/view?usp=sharing LAST-MODIFIED:20170412T163758Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Civic Engagement Week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180221T160000Z DTEND:20180221T170000Z DTSTAMP:20260828T094430Z UID:47a07h7dlq635l8baa4qh975or@google.com CREATED:20180212T161907Z DESCRIPTION:Speaker: \; Professor Jana Shen\, University of Mary land School of Pharmacy\, Dept. of Pharmaceutical Sciences\, Baltimore\, MD

Title: Modeling pH-Responsive Biopolymers: From Proteins to Hydrogels

Abstract: \;Protein and chitosan are two types of biopolymers abundant in nature. Proteins are the “workhorse” molecules o f life and their dynamical behavior governs human physiological functions a nd underlies many diseases. Chitosan\, a polysaccharide produced from shell fish\, can be used to make smart hydrogels that find a wide range of applic ations in medicine\, pharmacy and bioelectronics. In this seminar\, I will introduce a state-of-the-art computer simulations tool called continuous co nstant pH molecular dynamics. I will discuss two of our application studies to understand pH-responsive dynamics of proteins and chitosan-based materi als. Specifically\, I will discuss the development of a new protocol for pr otein-ligand binding free energy calculations and the discovery of a proton coupled allosteric site that determines the inhibitor selectivity for β-sec retase\, a major drug target for Alzheimer’s disease. I will also discuss t he pH-dependent self-assembly of chitosan and the role of salt in modulatin g chitosan dynamics and hydrogel formation. LAST-MODIFIED:20180214T134146Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161004T150000Z DTEND:20161004T160000Z DTSTAMP:20260828T094430Z UID:bbf42mjg1rg4tgd2kiqkrcins4@google.com CREATED:20160829T211322Z DESCRIPTION:Speaker: Samuel Lederer \n\nSpeaker Institution: MIT\n\nTitle: High Tc superconductivity and non-Fermi liquid behavior near a nematic quan tum critical point: a Monte Carlo study\n\nAbstract: The Ising nematic quan tum critical point (QCP) associated with the breaking of fourfold rotationa l symmetry in a zero temperature metal is an exemplar of metallic quantum c riticality. We have carried out a minus sign-free quantum Monte Carlo study of this QCP for a two dimensional lattice model with sizes up to 24 × 24 s ites. For sufficiently strong coupling between the fermions and the nematic bosons\, high temperature superconductivity emerges near the QCP. This sup erconductivity condenses out of a metallic normal state with a large\, temp erature independent single-fermion scattering rate\, and with transport pro perties inconsistent with Fermi liquid theory. Time permitting\, I will dis cuss implications of these results for cuprate strange metal phenomenology\ , and for the field theory of quantum critical metals.\n\nLocation: 2205 Jo hn S. Toll Physics Building\n\nHost: Dong-Ling Deng\n\nhttp://www.physics.u md.edu/cmtc/seminars.html LAST-MODIFIED:20160915T204304Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170719T150000Z DTEND:20170719T160000Z DTSTAMP:20260828T094430Z UID:5n7jac6ha4q9jtkuf5c1elp3dh@google.com CREATED:20170711T143502Z DESCRIPTION:Speaker Name: Christina Knapp\n\nSpeaker Institution: Departmen t of Physics\, University of California\, Santa Barbara\, California 93106 USA\n\nTitle: Scalable Designs for Majorana-Based Quantum Computing\n\nAbst ract: Storing quantum information non-locally in the joint state of pairs o f Majorana zero modes (MZMs) is a promising approach towards fault tolerant quantum computing. In this talk\, I will discuss designs for scalable Maj orana-based quantum computing architectures\, presented in PRB 95 (2017) ar Xiv:1610.05289\, that are both promising for large scale quantum computing and testable in near-term devices. I will first explain the topological pr otection and operation of these qubits in the limit of no charge noise and negligible MZM hybridization. I will then discuss the effects of charge no ise in the context of a near-term device\, the so-called "loop qubit." Fin ally\, I will consider how finite MZM hybridization affects the coherence t imes of the topological qubit. \n\n LAST-MODIFIED:20170711T143631Z LOCATION:CMTC conference room (2205 Toll Building) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC-JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170508T200000Z DTEND:20170508T213000Z DTSTAMP:20260828T094430Z UID:7q57up3q2ki4j6fq9tueffr5oc@google.com CREATED:20170502T131755Z DESCRIPTION:Speaker: Brian Shuve\n\nSpeaker Institution: SLAC\n\nTitle: Unc overing Signals of a Low-Mass Hidden Sector\n\nAbstract: Hidden sectors are motivated by a range of phenomena unexplained by the Standard Model\, such as dark matter\, neutrino masses\, and the baryon asymmetry. Hidden sector particles below the weak scale can be copiously produced at high-energy an d intensity-frontier experiments\, but may have evaded detection with curre nt searches. I will discuss new searches I am doing with the BaBar collabor ation that are probing unexplored\, well-motivated territory for hidden sec tors. I will also show how signatures such as displaced vertices and rare m eson decays motivate comprehensive\, complementary searches at low- and hig h-energy experiments. LAST-MODIFIED:20170502T131755Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T160000Z DTEND:20161130T170000Z DTSTAMP:20260828T094430Z UID:ktqn17aqdbf3smrckqu2ed96pg@google.com CREATED:20161122T134937Z DESCRIPTION:Speaker: Mario Szegedy\n\nSpeaker Affiliation: Rutgers Universi ty\n\nTitle: What does the Moser-Tardos RESAMPLE algorithm do when it does not work?\n\nAbstract: The celebrated Lovasz Local Lemma (LLL) guarantees t hat locally sparse systems always have solutions\, which one can also algor ithmically find by the Moser-Tardos RESAMPLE algorithm. Among the major que stions that remain open is that how far *beyond* Lovasz's condition can w e expect that RESAMPLE still performs in polynomial (linear) expected runni ng time? Stating the question correctly is a challenge already. For a solva ble and fixed instance RESAMPLE always comes up with a solution\, but the c atch is that the number of steps may be very large. We have therefore looke d at parameterized instance families and tried to identify phase transition s in terms of these parameters. Perhaps the biggest lesson we have learned is that if we want to see phase transition thresholds\, i.e. identify param eter values where RESAMPLE ``stops working\,'' we need to understand what h appens when RESAMPLE does *not* work. We have noticed that in this case the algorithm settles at a metastable equilibrium (at least for the homogenous instances we have considered)\, a phenomenon mostly studied for physical s ystems. We demonstrate (and illustrate) many of the interesting findings on a simple Coin Chain (spin chain) model. Even for this simple model some ma jor mysteries are remaining. LAST-MODIFIED:20161122T134937Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180124T190000Z DTEND:20180124T203000Z DTSTAMP:20260828T094430Z UID:6h1m1j5ursntde1v7aoafmnakl@google.com CREATED:20180124T160229Z DESCRIPTION:Speaker: \;Nima Arkani-Hamed

Speaker Institution: IA S Princeton


Informal Talk: "On the Positive Geometry of Effectiv e Field Theory”


LAST-MODIFIED:20180124T160229Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Informal Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170512T190000Z DTEND:20170512T203000Z DTSTAMP:20260828T094430Z UID:2prb5v1m142bmdnotfi7cppmc4@google.com CREATED:20170508T192714Z DESCRIPTION:Speaker Name: Yuhsin Tsai\n\nSpeaker Institution : University o f Maryland\n\nTitle : "Probing Dark Showers at LHCb"\n\nAbstract : Dark sho wer is a generic feature of the Hidden Valley model\, which produces bound states with a high multiplicity\, low masses\, and long lifetimes. The show ering process can arise\, for example\, in Neutral Naturalness models\, or in dark matter scenarios that explain the possible signal of gamma-ray exce ss. A collider search of such signals requires good vertex resolution\, low energy threshold\, as well as a good particle id to veto the background. I will explain why the LHCb experiment has a great potential in seeing dark showers and compare the estimated sensitivity to that of the future ATLAS/C MS searches. LAST-MODIFIED:20170508T192949Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171108T160000Z DTEND:20171108T170000Z DTSTAMP:20260828T094430Z UID:5675ipb8bi8dqtau3hf4f29ir1@google.com CREATED:20171103T122307Z DESCRIPTION:Speaker: Yunfeng Li\nTitle: The Impermeability of Graphene and its Applications LAST-MODIFIED:20171103T122307Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry - Student Literature Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180709T200000Z DTEND:20180709T213000Z DTSTAMP:20260828T094430Z UID:6pg9lg90n50vap8pc7uuvivipo@google.com CREATED:20180703T131023Z DESCRIPTION:

Speaker: Dominik Neuenfeld

Speaker Institution: University of Br itish Columbia

Title: Positive gravitational subsystem energies from CFT cone relative entropies

Abstract: In the context of the AdS/CFT correspondence\, inequalities obeyed by quantum information theoretic quan tities for CFT subregions imply inequalities for their dual gravitational q uantities. By understanding the corresponding dictionary we can hope to lea rn a lot about consistent solutions of quantum gravity. In this talk we wil l consider relative entropy for a general class of CFT subregions whose bou ndaries lie on a lightcone. Relative entropy is positive and monotonous. We show that the corresponding gravitational quantity is a positive measure o f energy for a gravitational subsystem associated to the boundary subsystem \, generalizing earlier results for ball-shaped regions. As part of the ana lysis\, we give an analytic expression for the extremal surface associated with such regions and discuss its implication for the saturation of strong subadditivity (the Markov property) of the vacuum state of holographic theo ries. LAST-MODIFIED:20180703T131023Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180322T180000Z DTEND:20180322T190000Z DTSTAMP:20260828T094430Z UID:2n8p0o45rg8uk42nit6l3mrvg8@google.com CREATED:20180228T190838Z DESCRIPTION:Speaker: Sankar Das Sarma\, UMD

Title: \; “ L inear-in-T resistivity\, violation of Mott-Ioffe-Regel criterion\, and diso bedience of Wiedemann-Franz law: \; Is this enough to accuse a metal of being ‘strange’ or ‘bad’?”

Abstract: A large fraction of the theoretical community believe that transport in many strongly correl ated materials manifests ‘obvious’ non-Fermi liquid behavior through their linear-in-T electrical resistivity\, their violation of the Mott-Ioffe-Rege l resistivity limit as well as the Wiedemann-Franz law. \; I will chall enge this non-Fermi liquid dogma using quantitative arguments based on the Fermi liquid theory being applied to a non-intuitive regime of low carrier density. \; I will critically analyze experimental transport data in se veral materials to assess the widespread theoretical claim of exotic or str ange or bad metallic behavior in many systems (e.g. cuprates\, ruthenates)\ , showing that\, in fact\, some (perhaps much) of the observed ‘strange’ or ‘bad’ behavior can be well-understood within the Fermi liquid paradigm of a strongly interacting electron system. LAST-MODIFIED:20180228T192429Z LOCATION:John S Toll Physicss Bldg.\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Sankar Das Sarma\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160503T171500Z DTEND:20160503T181500Z DTSTAMP:20260828T094430Z UID:ncae2qu8jffdftno44lelnocv8@google.com CREATED:20160421T160218Z DESCRIPTION:Speaker Name: Dr. Jordan Horowitz\n\nSpeaker Institution: MIT\n \nTitle: Linear response bounds far-from-equilibrium current fluctuations\n \nAbstract :Near equilibrium\, linear response theory has proven to be a po werful tool. At its core is the fluctuation-dissipation theorem\, which dic tates that the variance of small fluctuations is intimately related to diss ipation. However\, far from equilibrium no such equality exists. I will sho w that arbitrarily far from equilibrium dissipation still plays a dominant role in shaping fluctuations\, both small and large\, through some novel in equalities. In particular\, I will present a linear-response-like bound on the large deviation function for current fluctuations in Markov jump proces ses. These processes have proven to accurately model a variety of mesoscopi c systems from motor proteins to quantum dots. As a corollary\, I will prov ide a proof of a thermodynamic uncertainty relation for the trade-off betwe en the variance of fluctuations and dissipation. These results point to gen eral design principles for engineering artificial and natural nano-devices under energy constraints. LAST-MODIFIED:20160428T184541Z LOCATION:Room 1116\, IPST Building 085 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - Linear response bounds far-f rom-equilibrium current fluctuations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170417T190000Z DTEND:20170417T200000Z DTSTAMP:20260828T094430Z UID:plr2ugfar0skdltt39m3tk4iac@google.com CREATED:20170411T180636Z DESCRIPTION:Pop Up String Quartet from the University of Maryland School of Music\n#heartheturtle LAST-MODIFIED:20170413T123631Z LOCATION:PSC lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:String Quartet TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180323T200000Z DTEND:20180323T210000Z DTSTAMP:20260828T094430Z UID:4tif2rvpph2teaq96ecqhqjfu2@google.com CREATED:20180312T151755Z DESCRIPTION:Sp eaker Name: David Cafiso

Speaker Institution: University of Virginia


T itle : Two-Way Transmembrane Signaling in an Outer-Membrane Transport Prote in: or why do spectroscopy when we have a crystal structure?


Abstract : Protei ns execute motion over a wide range of amplitudes and time scales\, which m ay include large amplitude movements between discrete structural substates. A change in the equilibrium distribution of these substates is thought to underlie protein allostery and to play a role in mediating protein-protein recognition. Site-directed spin labeling when combined with EPR spectroscop y is a powerful method to examine conformational exchange and structural he terogeneity in globular\, membrane proteins and protein complexes. We will discuss TonB-dependent transporters\, which are an important class of outer -membrane transport proteins that function in the uptake of nutrients by Gr am negative bacteria. In particular\, we will describe the use of EPR spect roscopy to characterize the Escherichia coli vitamin B12 transporter\, BtuB \, and show that the Ton box (an N-terminal energy coupling motif) and the substrate binding site are allosterically coupled. We will discuss the like ly mechanisms of transport in this family of transport proteins\, and descr ibe novel methods to achieve efficient spin-labeling and carry out pulse EP R spectroscopy on these proteins in whole bacteria. \;





 LAST-MODIFIED:20180312T152534Z LOCATION:Location: 0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180423T200000Z DTEND:20180423T210000Z DTSTAMP:20260828T094430Z UID:1gdbp8ghcm921nsb4p9fseu2ll@google.com CREATED:20180405T150339Z DESCRIPTION:Speaker Name: David Cafiso

Speaker In stitution: University of Virginia

Title: Two-Way Transm embrane Signaling in an Outer-Membrane Transport Protein: or why do spectro scopy when we have a crystal structure?

Abstract: Prote ins execute motion over a wide range of amplitudes and time scales\, which may include large amplitude movements between discrete structural substates . A change in the equilibrium distribution of these substates is thought to underlie protein allostery and to play a role in mediating protein-protein recognition. Site-directed spin labeling when combined with EPR spectrosco py is a powerful method to examine conformational exchange and structural h eterogeneity in globular\, membrane proteins and protein complexes. We will discuss TonB-dependent transporters\, which are an important class of oute r-membrane transport proteins that function in the uptake of nutrients by G ram negative bacteria. In particular\, we will describe the use of EPR spec troscopy to characterize the Escherichia coli vitamin B12 transporter\, Btu B\, and show that the Ton box (an N-terminal energy coupling motif) and the substrate binding site are allosterically coupled. We will discuss the lik ely mechanisms of transport in this family of transport proteins\, and desc ribe novel methods to achieve efficient spin-labeling and carry out pulse E PR spectroscopy on these proteins in whole bacteria. \;
 LAST-MODIFIED:20180405T151733Z LOCATION: 0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161109T210000Z DTEND:20161109T220000Z DTSTAMP:20260828T094430Z UID:ld25bl4lg7qton4bb67sq05gj0@google.com CREATED:20161019T161340Z DESCRIPTION:Speaker Name: Fabio Riva\n\nSpeaker Institution : Ecole Polytec hnique Federale de Lausa\n\nTitle : Development and applications of Verific ation and Validation procedures\n\nSpeaker Institution : Ecole Polytechniqu e Federale de Lausanne\n\nAbstract : The methodology used to assess the rel iability of numerical simulation codes constitutes the Verification and Val idation (V&V) procedure. V&V is composed by three separate tasks: the code verification\, which is a mathematical issue targeted to assess that the ph ysical model is correctly implemented in a simulation code\; the solution v erification\, which evaluates the numerical errors affecting a simulation\; and the validation\, which determines the consistency of the code results\ , and therefore of the physical model\, with experimental data. To perform a code verification\, we propose to use the method of manufactured solution s\, a methodology that we have generilized to PIC codes\, overcoming the di fficulty of dealing with a numerical method intrinsically affected by stati stical noise. The solution verification procedure we put forward is based o n the Richardson extrapolation\, used as higher order estimate of the exact solution. These verification procedures were applied to GBS\, a three-dime nsional fluid code for SOL plasma turbulence simulation based on a finite d ifference scheme\, and to a unidimensional\, electrostatic\, collisionless PIC code.\n\nTo perform a detailed validation of GBS against experimental m easurements\, we generalized the magnetic geometry of the simulation code t o include elongation and non-zero triangularity\, and we investigated theor etically the impact of plasma shaping effects on SOL turbulence. An experim ental campaign to validate our findings against experimental measurements i n tokamak limited configurations has just been completed on TCV.\n LAST-MODIFIED:20161019T161648Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170414T161500Z DTEND:20170414T171500Z DTSTAMP:20260828T094430Z UID:mq6o266un2hi2cuo2tn9fv43p4@google.com CREATED:20170406T125117Z DESCRIPTION:Title: Thermal radiation from a strongly correlated one-dimensi onal electron liquid\n\nSpeaker Name: Wade DeGottardi\n\nSpeaker Institutio n: JQI & IREAP\n\nAbstract: \n\nIn this talk\, I will present recent work o n the properties of radiation from a one-dimensional electron liquid. Becau se of the large mismatch between the speed of light and the Fermi velocity\ , radiation serves as a direct test of spectral weight of the system which is far `off-shell'. In the Luttinger liquid model\, excitations of the elec tron liquid are described by non-interacting bosons and this spectral weigh t vanishes. Thus\, radiation offers a direct test of behavior which is beyo nd the Luttinger liquid paradigm. I will discuss several examples of system s for which such radiation can be observed. LAST-MODIFIED:20170406T125117Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170911T203000Z DTEND:20170911T213000Z DTSTAMP:20260828T094430Z UID:75a886kvut2d4j6u0gh93o9nil@google.com CREATED:20170905T141618Z DESCRIPTION:Title : Down-to-earth searches for cosmological dark matter wit h LUX and LZ\nSpeaker Name: Carter Hall\nSpeaker Institution : University o f Maryland\n\nAbstract : A laboratory detection of the Milky Way's dark mat ter halo would be a spectacular confirmation of modern cosmology\, and woul d rewrite the standard model of particle physics as well. The LUX experimen t searched for WIMP interactions in an underground detector in South Dakota between 2013 and 2016 and found no evidence for the existence of these hyp othetical particles\, setting stringent constraints on their properties. Th is talk will review the LUX results\, and more recent results from the Xeno n1T and PandaX-II experiments. I will also describe the status of the LZ ex periment\, which will explore another factor of 100 in cross-section parame ter space starting in 2020.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30\n slasley@space.umd.edu LAST-MODIFIED:20170905T141618Z LOCATION:Atlantic Bldg Rm 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161019T180000Z DTEND:20161019T190000Z DTSTAMP:20260828T094430Z UID:bv4o2i8huntgsmd62fp2q1tn40@google.com CREATED:20161010T193118Z DESCRIPTION:TITLE: \n"Quantum propagation of light: from photon molecules t o many-body physics"\n\nSPEAKER/INSTITUTION:\nJames Douglas/The Institute o f Photonic Sciences\, Barcelona\n\nABSTRACT:\n\n"Recent experiments have de monstrated that light propagation through ensembles of Rydberg atoms is hig hly non-linear at the level of individual photons. Other developing platfor ms\, such as circuit QED and atoms coupled to nanophotonic waveguides\, als o promise the ability to engineer the quantum state of propagating light at the few and many-body limit. Coupled to these experimental advances\, effe ctive theoretical descriptions have been produced\, modeling the physics in specific instances. However\, general numerical techniques are currently l imited. Here\, we describe an approach to this problem by using a "spin mod el" that maps the light propagation problem to a system of interacting spin s\, where all of the photon correlations are obtained from those of the spi ns. In the few-body limit we use this method to show that in systems of ato ms coupled to photonic-crystal waveguides photons can bind together forming molecules. Going beyond this limit\, we can use the powerful toolbox of ma trix product states to solve the spin problem and study multi photon effect s\, where as an example we simulate the number dependent pulse velocity in vacuum induced transparency." LAST-MODIFIED:20161011T005422Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170828T150000Z DTEND:20170828T160000Z DTSTAMP:20260828T094430Z UID:7cl8mpj34ilb052cckiaentbgg@google.com CLASS:PUBLIC CREATED:20170808T181939Z DESCRIPTION:Juan Maldacena\, IAS Princeton\n\nTittle:\n"Quantum mechanics a nd the geometry of spacetime". \n\nAbstract:\nQuantum mechanics is importan t for determining the geometry of spacetime.\nWe will review the role of qu antum fluctuations that determine the large scale structure of the universe .\nIn some model universes we can give an alternative description of the ph ysics in terms of a theory of particles that lives on its boundary.\nThis i mplies that the geometry is an emergent property. Furthermore\, entanglemen t plays a crucial role in the emergence of geometry. Large amounts of entan glement are conjectured to give rise to geometric connections\, or wormhole s\, between distant and non-interacting systems. LAST-MODIFIED:20170808T181939Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180126T210000Z DTEND:20180126T221500Z DTSTAMP:20260828T094430Z UID:3bm0tlqvltfngftglhb1iesgn1@google.com CREATED:20180116T135535Z DESCRIPTION:Speaker: Sarthak Subhankar\n\nAffiliation: JQI\n\nTitle: A cohe rent optical lattice with subwavelength structure\n\nAbstract: Coherent con trol of the position and motion of neutral atoms using the ac-Stark shift i nduced by light has been the workhorse in the field of quantum simulation. This approach\, where the optically produced spatial potential is proportio nal to the light intensity\, is fundamentally limited by the wave nature of the light and cannot produce spatial features with subwavelength resolutio n. In this talk\, I will present an experiment where a 1D array of ultra-na rrow barriers are created with width smaller than 1/50 the wavelength of th e light. Instead of ac-Stark shift\, this potential is based on the geometr ic potential atoms experience moving in a specially designed light field. S ince this effect is both geometric and quantum in nature\, it overcomes the diffraction limit of the light generating the potential. We study the band structure and dissipation of atoms in this lattice and compare our finding s with theoretic predictions. The ability to coherently manipulate atoms on a subwavelength scale opens many exciting opportunities\, including tunnel junctions for atomtronics applications\, nearly perfect box-like atom trap s\, and stroboscopically generated lattices with subwavelength spacings.\n\ n*Snacks and drinks at 4 pm* LAST-MODIFIED:20180117T202926Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171213T203000Z DTEND:20171213T213000Z DTSTAMP:20260828T094430Z UID:5dqf9mhd967q63b32n955q9i8t@google.com CREATED:20171207T141155Z DESCRIPTION:Speaker Name: Dr. Stuart Hudson\n\nSpeaker Institution : Prince ton Plasma Physics Laboratory\n\nTitle : Some variational calculus for desi gning stellarator coils\n LAST-MODIFIED:20171207T141300Z LOCATION: Location: Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170222T200000Z DTEND:20170222T210000Z DTSTAMP:20260828T094430Z UID:tv39npj5ht4liq9ce1vfrva510@google.com CREATED:20170209T154416Z DESCRIPTION:Speaker Name: Prof. Dan Prober\n\nSpeaker Institution : Yale\n\ nTitle: Ultrasensitive far-IR and mid IR detectors\n\nAbstract: Ultrasens itive far-IR and mid-IR detectors are an important area for developing futu re technology\, where development of new materials and approaches is produc tive. We have conducted recent studies of single-layer graphene at T ≈100 mK to 20 K to determine the electron-phonon interaction in this 2D metal at low temperatures. This single-atom carbon layer has extremely low heat ca pacity and thermal conductance\, enabling ultrasensitive photon energy dete ction. We use Johnson noise thermometry with an ultra-low noise cryogenic amplifier in our study\, and have verified the theory for the clean limit e lectron-phonon coupling in graphene. Efficient detection of individual-far -IR photons\, a previously unattainable goal\, appears possible with these materials.\nBiography:\nDr. Prober is a Professor of Applied Physics and Ph ysics and Electrical Engineering at Yale. His main research interests are in nanosystems\, superconductivity\, quantum noise and ultrasensitive photo n detectors. Dr. Prober is a Fellow of the APS\, and has received two NASA research invention awards and two Fulbright Fellowships. He has also recei ved a number of IBM Faculty Awards. His teaching ranges from a graduate cou rse on superconductivity to seminars on ‘Science of Modern Technology’ and ‘Energy\, Technology and Society’. Dr. Prober’s website is http://proberla b.yale.edu/ \n***********************************************\nFor mor e information please contact Paul Kolb [pkolb@lps.umd.edu] or Ray Phaneuf [ phaneuf@lps.umd.edu].\nNote: LPS is located at 8050 Greenmead Drive in Coll ege Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; tak e #105 for the Courtyard Apts. Please use the phone on the left hand side o f the front door to call the receptionist for entry. LAST-MODIFIED:20170216T203545Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160722T200000Z DTEND:20160722T210000Z DTSTAMP:20260828T094430Z UID:f5gthvthgq2n91jqv0quaarcoc@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.f5gthvthgq2n91j qv0quaarcoc CLASS:PUBLIC CREATED:20160714T135857Z DESCRIPTION:Speaker: Jed Pixley\n\nInstitution: CMTC\n\nLocation and Time: PSC 2136 at 4:00pm\n\nTitle: An introduction to quantum criticality\n\nAbst ract: I will give an introduction to zero temperature quantum phase transit ions in the context of quantum statistical mechanics. I will begin by revie wing classical thermal phase transitions and then introduce quantum fluctua tions that drive the critical temperature to zero\, resulting in a quantum critical point (QCP) and the corresponding finite temperature quantum criti cal fan. I will show how quantum fluctuations appear in the role of extra “spatial” dimensions generalizing Landau-Ginzburg theory to quantum mechani cal systems. I will then discuss the QCP in the Bose-Hubbard model\, which is a quintessential model in the context of ultra cold atomic gases. If tim e permits I will also discuss the case of itinerant quantum phase transitio ns in correlated electronic systems.\n\n(The JQI summer school is for stude nts and postdocs\, but others are welcome to join for refreshments afterwar ds\; Discussion with pizza and refreshments at 5:00pm)\n\nJoin with Google Hangouts: https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc1YjhqaDdla zZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.f5gthvthgq2n91jqv0quaarco c?hs=121 LAST-MODIFIED:20160722T201149Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SUMMER SCHOOL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171106T200000Z DTEND:20171106T213000Z DTSTAMP:20260828T094430Z UID:1fmr2vpt14skfamotp5tc907eh@google.com CREATED:20171030T182345Z DESCRIPTION:Speaker: Hooman Davoudiasl\n\nSpeaker Institution: Brookhaven N ational Lab\n\nTitle: Unified Scenario for Composite Right-handed Neutrinos and Dark Matter\n\nAbstract: We entertain the possibility that neutrino ma sses and dark matter (DM) originate from a common composite dark sector. A minimal effective theory can be constructed based on a dark SU(3)_D interac tion with three flavors of massless dark quarks\; electroweak symmetry brea king gives masses to the dark quarks. Assuming a Z_2 symmetry\, a stable "d ark kaon" can provide a good thermal relic DM candidate. We find that "dar k neutrons" may be identified as right handed Dirac neutrinos. Some level o f "neutron-anti-neutron" oscillation in the dark sector can then result in non-zero Majorana masses for light Standard Model neutrinos. A simple ultra violet (UV) completion is presented. At our benchmark point\, we expect sp ectacular collider signals arising from the UV framework\, including the de cay of the Higgs boson to tau pairs plus any two leptons\, with displaced v ertices. We discuss some of the observational signatures of the UV framewor k. LAST-MODIFIED:20171030T182520Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T193000Z DTEND:20180316T203000Z DTSTAMP:20260828T094430Z UID:4d5flcvviqj8rsqa3r79knsjg7@google.com CREATED:20180309T211051Z DESCRIPTION:
Speaker Nam e: Brett Scheiner


Speaker Institution : Los Alamos National Laboratory


Title : Fireball Ons et and Steady State Properties



Abstract:&nbs p\; \; \;Low-pressure anode spots\, also known as fireballs\, are a discharge phenomenon that can occur at electrodes biased above the plasma potential. Although fireballs are one of the oldest know plasma phenomenon [1]\, and despite the fact that they have been extensively studied\, the me chanism behind their formation remained unknown due to the rapidity of thei r onset. This talk presents particle in cell simulations\, laser-based expe rimental observations\, and a model of the fireball onset [2\,3]. Simulatio ns show that the fireball forms when enough positive space charge from elec tron impact ionization within the sheath is present to form an electron tra pping potential well. Using these observations\, a model for the spot onset and steady state properties is formulated. The predicted formation process has characteristic features that are observed in laser-based measurements of the fireball electric field and electron density.



 LAST-MODIFIED:20180309T211222Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161202T171500Z DTEND:20161202T181500Z DTSTAMP:20260828T094430Z UID:bfrbdmusqpqhb3maiipkrufepo@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.bfrbdmusqpqhb3m aiipkrufepo CREATED:20161124T031234Z DESCRIPTION:Title: Shortcuts to quantum network routing\n\nSpeaker Name: Ed die Schoute \n\nSpeaker Institution: QuICS and Qutech\, Delft University of Technology\, the Netherlands.\n\nAbstract: A quantum network promises to e nable long distance quantum communication and assemble small quantum device s into a large quantum computing cluster. Each network node can thereby be seen as a small quantum computer. Qubits can be sent over direct physical l inks connecting nearby quantum nodes\, or by means of teleportation over pr e-established entanglement amongst distant network nodes. Such pre-shared e ntanglement effectively forms a shortcut - a virtual quantum link - which c an be used exactly once.\n\nWe present an abstraction of a quantum network that allows ideas from computer science to be applied to the problem of rou ting qubits and managing entanglement in the network. Specifically\, we con sider a scenario in which each quantum network node can create EPR pairs wi th its immediate neighbors over a physical connection and perform entanglem ent swapping operations in order to create long distance virtual quantum li nks. We proceed to discuss the features unique to quantum networks that cal l for the development of new routing techniques. As an example\, we present two simple hierarchical routing schemes for a quantum network of N nodes f or a ring and sphere topology. For these topologies we present efficient ro uting algorithms requiring O(log N) qubits to be stored at each network nod e\, O(polylog N) time and space to perform routing decisions\, and O(log N) timesteps to replenish the virtual quantum links in a model of entanglemen t generation.\n\nBased on the paper: arXiv:1610.05238.\n\nJoin with Google Hangouts: https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc1YjhqaDdla zZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.bfrbdmusqpqhb3maiipkrufep o?hs=121 LAST-MODIFIED:20161124T031313Z LOCATION:PSC 2136\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160519T180000Z DTEND:20160519T190000Z DTSTAMP:20260828T094430Z UID:6f0mojvn3r0ii56g3940q64dvs@google.com CREATED:20160513T141219Z DESCRIPTION:Speaker: Huangjun Zhu\n\nSpeaker Affiliation: ITP\, Cologne\n\n Title: Multiqubit Clifford groups are unitary 3-designs\n\nAbstract: We sho w that the multiqubit (including qubit) Clifford group in any even prime po wer dimension is not only a unitary 2-design\, but also a unitary 3-design. Moreover\, it is a minimal unitary 3-design except for dimension 4. As an immediate consequence\, any orbit of pure states of the multiqubit Clifford group forms a complex projective 3-design\; in particular\, the set of sta bilizer states forms a 3-design. By contrast\, the Clifford group in any od d prime power dimension is only a unitary 2-design. In addition\, we show t hat no operator basis is covariant with respect to any group that is a unit ary 3-design\, thereby providing a simple explanation of why no discrete Wi gner function is covariant with respect to the multiqubit Clifford group. T his result is of interest to understanding the power of quantum computation . Finally\, I will mention briefly the decomposition of the fourth tensor p ower of the Clifford group and construction of Clifford covariant 4-designs as well as potential applications in compressed sensing and quantum proces s tomography etc.\n\nhttp://arxiv.org/abs/1510.02619 LAST-MODIFIED:20160513T141219Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171011T183000Z DTEND:20171011T200000Z DTSTAMP:20260828T094430Z UID:5ulkp56rbuadbftvuc8f28nuig@google.com CREATED:20170831T160704Z DESCRIPTION:Speaker: Yi Li\n\nSpeaker Institution: Johns Hopkins University \n\nTitle: Fermion positivity and the quantum Monte-Carlo sign problem\n\nA bstract: The sign problem is a major obstacle in quantum Monte Carlo simula tions for many-body fermion systems. I will discuss several results about s ufficient conditions for the absence of the fermion sign problem\, includin g a new perspective based on Majorana reflection positivity and Majorana Kr amers positivity\, which provides a unified description for the interacting lattice fermion models previously known to be free of the sign problem bas ed on the auxiliary field quantum Monte Carlo method and allows us to ident ify a number of new sign-problem-free interacting fermion models. LAST-MODIFIED:20171005T142433Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171205T181500Z DTEND:20171205T191500Z DTSTAMP:20260828T094430Z UID:33a2d6gc0lmolfuqi0385lfgln@google.com CREATED:20171127T163605Z LAST-MODIFIED:20171205T160558Z LOCATION:1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170921T123000 DTEND;TZID=America/New_York:20170921T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20170921T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker: Miguel Sanjuán\nKing Juan Carlos University | Departme nt of Physics\nTitle: Basin Entropy: A Measure of the Final State Unpredict ability and Applications to Some Physical Systems\nAbstract: In nonlinear d ynamics\, basins of attraction link a given set of initial conditions to it s corresponding final states. This notion appears in a broad range of appli cations where several outcomes are possible\, which is a common situation i n neuroscience\, economy\, astronomy\, ecology and many other disciplines. Depending on the nature of the basins\, prediction can be difficult even in systems that evolve under deterministic rules. From this respect\, a prope r classification of this unpredictability is clearly required. To address t his issue\, we introduce the basin entropy\, a measure to quantify this unc ertainty. Its application is illustrated with several paradigmatic examples that allow us to identify the ingredients that hinder the prediction of th e final state. The basin entropy provides an efficient method to probe the behavior of a system when different parameters are varied.Additionally\, we provide a sufficient condition for the existence of fractal basin boundari es: when the basin entropy of the boundaries is larger than log 2\, the bas in is fractal. These ideas have been applied to some physical systems such as experiments of chaotic scattering of cold atoms\, models of shadows of b inary black holes\, and classical and relativistic chaotic scattering assoc iated to the Hénon-Heiles Hamiltonian system in astrophysics. LAST-MODIFIED:20170911T175520Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180221T180000Z DTEND:20180221T193000Z DTSTAMP:20260828T094430Z UID:6pn4gkavnuen4br8jfe035b5uj@google.com CREATED:20180116T144838Z DESCRIPTION:Speaker: Jozef Dudek\n\nSpeaker Institution: William & Mary\n\ nTitle: Thinking Inside the Box - Hadron Resonances in QCD \n\nAbstract: I will describe how we can make use of the finite box in which lattice QCD c alculations are performed to learn something about hadron scattering amplit udes from first principles. These amplitudes contain information about the resonance structure of QCD and hence the spectrum of excited mesons and bar yons. I'll present the results of recent calculations in which the lightest scalar\, vector and tensor mesons have been studied. LAST-MODIFIED:20180212T142250Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180215T123000 DTEND;TZID=America/New_York:20180215T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180215T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Ankit Barik\nJohns Hopkins - Department of Earth & Pla netary Sciences\nTitle: The spherical Couette system: simple yet complex\nA bstract: The spherical Couette system consists of two concentric spheres ro tating differentially about a common axis. The space in between the spheres is filled with a conducting fluid. It is a relatively simple system withou t any thermal or density stratification and and has potential applications to planetary and stellar interiors. In addition\, it is also an extremely i nteresting fluid dynamical system displaying a host of complex instabilitie s and other fluid dynamics phenomena. In the first part of the talk\, I sha ll introduce the system and explore the generic regimes of different instab ilities. This will be followed by some results using hydrodynamic simulatio ns of this system with two pseudo-spectral codes MagIC and XSHELLS while co mparing them with experimental data. Focus will be on the origin of special wave instabilities called 'inertial modes' and the transition to turbulenc e. In the next part\, I will present magnetohydrodynamic simulations explor ing the effect of an external magnetic field on inertial modes. In the fina l part of the talk\, I will present simulations of self-consistent dynamo action in this system and the parameter dependence of the same. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170127T180000Z DTEND:20170127T190000Z DTSTAMP:20260828T094430Z UID:vihq2u1b4tf6886a45ofdlg86c@google.com CREATED:20170123T201344Z DESCRIPTION:Speaker Name: Ebrahim Najafi\n\nSpeaker Institution: CalTech\ n\nTitle: Imaging of Charge Carrier Dynamics at Semiconductor Surfaces and Interfaces by\nUltrafast Electron Microscopy.\n\nAbstract: A thorough und erstanding of the interfacial carrier dynamics in semiconductors is essenti al to the further development of nanoelectronic\, optoelectronic and photov oltaic technologies. Since there is a constant supply of energy during the operation of a typical device\, carriers are often driven away from equilib rium\, where their spatiotemporal behavior becomes nonlinear and chaotic. I n addition\, the relaxation pathway of these excited carriers involves the exchange of energy\, transport in the space\, and complete disappearance du e to recombination. The control and manipulation of these events at the nan oscale\, whose timescale spans from a few femtoseconds to hundreds of micro seconds\, will enable the design and fabrication of complex devices with su preme performance and efficiency. Conventional spectroscopy techniques are unable to study such processes at the nanoscale due to their ins ufficient spatiotemporal resolution. Scanning ultrafast electron microscop y (SUEM) overcomes such limitation by allowing high resolution imaging of t he electronic and structural dynamics at the femtosecond\, picosecond and n anosecond timescales. In this work\, we investigated the spatial dynamics o f charge carriers in silicon by SUEM\; specifically\, we explored the initi al super-diffusion of carriers following optical excitation which lasted te ns of picoseconds and ultimately transitioned into the steady-state surface diffusion. Interestingly\, at large excitation densities\, electrons and h oles showed non-linear transport behavior\, resulting in the emission of pl asma waves. Finally\, we studied charge carrier dynamics at the silicon p-n junction which showed that charge separation was not limited to the juncti on and began tens of micrometers away\; in addition\, the separated charges remained localized in both space and time across the junction for tens of nanoseconds.\n \nFor more info\, visit:http://www.mse.umd.edu/events/semina rs LAST-MODIFIED:20170126T192709Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171127T110000 DTEND;TZID=America/New_York:20171127T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171127T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Monika Schleier-Smith\n\nTitle: Interfacing Spins with Photons for Quantum Simulation and Quantum Control\n\nAbstract: Coupling m any atoms to a single mode of light offers an efficient means of spreading quantum information across an extended many-body system. In ongoing experi ments\, we are harnessing photons in an optical cavity to mediate flip-flop interactions among distant spins in a cloud of rubidium atoms. Such inter actions can enable quantum simulations of exotic Hamiltonians featuring non -local hopping of strongly interacting bosons\, which may ultimately shed l ight on fundamental bounds in quantum information scrambling. I will also touch on complementary prospects in cavity-aided quantum control\, focusing on a robust and versatile scheme for “painting” non-classical collective s pin states using a single photon as a “brush”. LAST-MODIFIED:20171121T173443Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180907T170000Z DTEND:20180907T180000Z DTSTAMP:20260828T094430Z UID:35ra1vrskrg8c4snb1hmk0aprr@google.com CREATED:20180827T141041Z LAST-MODIFIED:20180905T143118Z LOCATION:2108 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMINAR - FACULTY MEETING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160907T193000Z DTEND:20160907T203000Z DTSTAMP:20260828T094430Z UID:qc4lb9k64tp1h5vo7cumcjjoa0@google.com CREATED:20160902T152931Z DESCRIPTION:Speaker Name: Professor Zetian Mi\n\nSpeaker Institution: Depar tment of Electrical Engineering and Computer Science\nUniversity of Michiga n\, Ann Arbor\n\nTitle: Artificial Photosynthesis on III-Nitride Nanowire A rrays\n\nAbstract: High efficiency artificial photosynthesis\, that can co nvert solar energy directly into chemical fuels\, has been extensively inve stigated. Critical to this development is the stable and efficient generati on of H2 from water under direct sunlight irradiation. To date\, however\, success in finding abundant visible-light active photocatalyst has been ver y limited. Recently\, metal-nitrides have attracted considerable attention for applications in artificial photosynthesis\, due to their extraordinary stability and tunable energy bandgap across nearly the entire solar spectru m. Moreover\, III-nitrides are the only known material whose energy bandgap can straddle the redox potential of water under deep visible and near-infr ared light irradiation. In 2011\, we have demonstrated\, for the first time \, spontaneous overall water splitting on GaN nanowire arrays. We have disc overed that the quantum efficiency for overall water splitting and hydrogen generation on the emerging nanostructured photocatalysts can be dramatical ly enhanced by precisely tuning the surface Fermi-level. We have further de veloped InGaN/GaN nanowire photoanodes and photocathodes\, which are monoli thically integrated on Si solar cell wafer through a polarization-enhanced tunnel junction. The devices exhibit highly stable hydrogen generation unde r simulated sunlight illumination. Such high efficiency photocatalysts also offer an entirely new avenue for recycling anthropogenic carbon dioxide to renewable fuels and for reducing nitrogen to ammonia.\n\nAbout the speaker :\nZetian Mi is a Professor in the Department of Electrical Engineering and Computer Science at the University of Michigan\, Ann Arbor. Prof. Mi’s tea ching and research interests are in the areas of III-nitride semiconductors \, low dimensional nanostructures\, LEDs\, lasers\, Si photonics\, and sola r fuels. He has published 10 book chapters and over 180 journal papers on t hese topics. Prof. Mi has received the Young Scientist Award from the Inter national Symposium on Compound Semiconductors in 2015 and the Young Investi gator Award from the 27th North American Molecular Beam Epitaxy Conference in 2010. Most recently\, Prof. Mi was an Associate Professor of Electrical & Computer Engineering at McGill University\, where he received several maj or awards including the Engineering Innovation Award. Prof. Mi served as th e Program Chair of the 30th North American Conference on Molecular Beam Epi taxy in 2013 and is the General Chair of 2016-2017 IEEE Photonics Society S ummer Topical Meeting.\n Email: ztmi@umich.edu LAST-MODIFIED:20160902T153744Z LOCATION:Room 2460 A.V. Williams Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Electrical Engineering and Computer Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180315T203000Z DTEND:20180315T213000Z DTSTAMP:20260828T094430Z UID:3sn0g1kvk4nrqr47e2at6qucou@google.com CREATED:20180309T161524Z DESCRIPTION:

Richard Schoen
Stanford and UC Irvine

Location: Kirwan Hall 3206

Abstract: This talk will be a survey of some of the geometric problems and ideas which either arose from general relativity or have direct bearing on the Einstein equations.
It is intended for a gene ral mathematical audience with minimal physics background.
Topics will i nclude an introduction to the Cauchy problem for the Einstein equations\, p roblems related to gravitational mass which are closely related to the Riem annian geometry of positive scalar curvature\, and trapped surfaces which a re related to the mean curvature and minimal surfaces.

http s://www-math.umd.edu/research/conferences/geometry-week-march-12- 16-2018/distinguished-lectures-in-geometric-analysis.html

LAST-MODIFIED:20180309T171416Z LOCATION:Kirwan Math 3206 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Lectures in Geometric Analysis: Geometry and General Relativity TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171117T110000 DTEND;TZID=America/New_York:20171117T115000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com RECURRENCE-ID;TZID=America/New_York:20171110T110000 CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nEighth lecture: Natural Language Processing\n\nCourse description: T his short course covers the fundamentals of machine learning\, assuming the typical background and motives of a physicist. It's goal is to give those who attend an understanding of the field and its capabilities\, as well the tools to learn the necessary extensions of the topic to apply it to their physics research. Lectures will include introductions to Python\, Linux\, n eural nets\, deep learning\, natural language processing\, imagine recognit ion/computer vision\, and AI safety.\n\nRSVP for the first friday here: htt p://bit.ly/2xgpvDE\njustinkterry@gmail.com LAST-MODIFIED:20171020T151800Z LOCATION:Edward St. John 2208 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180212T203000Z DTEND:20180212T213000Z DTSTAMP:20260828T094430Z UID:4c0va78fbrc6hrqt7gb9t3nobe@google.com CREATED:20180205T152719Z DESCRIPTION:Speaker Name: Alexander Tchekhovskoy\n\nSpeaker Institution: No rthwestern University \n\n\nTitle: Simulations of Black Hole Accretion and Outflows \n\n\nAbstract: Black holes are responsible for a wide variety o f astrophysical phenomena. They devour stars\, eject relativistic jets\, af fect star formation and galaxy\nevolution\, and enrich the Universe with he avy elements. I will discuss how global general relativistic magnetized flu id dynamics numerical simulations allow us to use this activity to quantita tively probe strong-field gravity and constrain black hole physics in vario us astrophysical contexts. LAST-MODIFIED:20180205T152719Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170308T160000Z DTEND:20170308T170000Z DTSTAMP:20260828T094430Z UID:sfdpjgp1pqv6vl35cr1ds2gbls@google.com CREATED:20170227T152755Z DESCRIPTION:Speaker: Christian Schaffner\n\nSpeaker Affiliation: U. Amsterd am\n\nTitle: Quantum homomorphic encryption for polynomial-sized circuits\n \nAbstract: We present a new scheme for quantum homomorphic encryption whic h is compact and allows for efficient evaluation of arbitrary polynomial-si zed quantum circuits. Building on the framework of Broadbent and Jeffery [B J15] and recent results in the area of instantaneous non-local quantum comp utation [Spe15]\, we show how to construct quantum gadgets that allow perfe ct correction of the errors which occur during the homomorphic evaluation o f T gates on encrypted quantum data. Our scheme can be based on any classic al (leveled) fully homomorphic encryption (FHE) scheme and requires no comp utational assumptions besides those already used by the classical scheme. T he size of our quantum gadget depends on the space complexity of the classi cal decryption function – which aligns well with the current efforts to min imize the complexity of the decryption function. Our scheme (or slight vari ants of it) offers a number of additional advantages such as ideal compactn ess\, the ability to supply gadgets “on demand”\, circuit privacy for the e valuator against passive adversaries\, and a three-round scheme for blind d elegated quantum computation which puts only very limited demands on the qu antum abilities of the client.\n\njoint work with Yfke Dulek and Florian Sp eelman\nhttps://arxiv.org/abs/1603.09717\nappeared at CRYPTO 2016 and QIP 2 017 LAST-MODIFIED:20170227T152755Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180212T183000Z DTEND:20180212T200000Z DTSTAMP:20260828T094430Z UID:6b30cpea3k0ivh23fn4juecfl1@google.com CREATED:20171205T180651Z DESCRIPTION:Speaker: Jose Ramon Pelaez\n\nSpeaker Institution: Universidad Complutense de Madrid\n\nTitle: Dispersive tools for light meson scattering and resonance determinations \n\nAbstract: In this talk I introduce the b asics of dispersion theory for light meson scattering\, \nmotivating the ne ed for such rigorous and model independent formalism. \nI will then review the recent dispersive analysis of pion-pion and pion-kaon scattering\nyield ing consistent data parameterizations and explaining how they have settled the discussion on the existence and the parameters of the controversial lig htest scalar mesons: the f0(500) or sigma and the K0*(800) or kappa. LAST-MODIFIED:20180207T173043Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170228T160000Z DTEND:20170228T171500Z DTSTAMP:20260828T094430Z UID:klhreqqtdrjtl0s95b2sft30fo@google.com CREATED:20170120T205037Z DESCRIPTION:Speaker: Yi-Zhuang You (Harvard)\n\nTitle: Bosonic Symmetry Pro tected Topological States: Theory\, Numerics\, and Experimental Platform\n\ nAbstract: Topological phases of matter is an active research area of conde nsed matter physics. Among various topics\, the bosonic symmetry protected topological (BSPT) states have attracted enormous theoretical interest in t he last few years. BSPT states are bosonic analogs of topological insulator s. The Haldane phase of spin-1 chains is one famous example. I will talk ab out our recent proposal to realize two-dimensional BSPT states in the twist ed bilayer graphene with strong magnetic field\, as well as numerical simul ations of the lattice model in various parameter regimes. The proposed BSPT state is a quantum spin Hall insulator with bosonic boundary modes only. T he bosonic modes are spin and charge collective excitations of electrons. T he quantum phase transition between the topological and the trivial phases happens by closing the gap of bosonic modes in the bulk\, without closing t he single particle gap of electrons\, which is fundamentally different from all the well-known topological transitions in free fermion topological ins ulators. On the theory side\, the phase transition is related to topics of deconfined criticality and duality of (2+1)D conformal field theories. The theoretical\, numerical and experimental studies will deepen our understand ing of quantum phase transitions.\n\nLocation: 2205 John S. Toll Physics Bu ilding\n\nHost: Xiao Li\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170120T233241Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171010T150000Z DTEND:20171010T161500Z DTSTAMP:20260828T094430Z UID:11um0dk68bn4theirb19isogl8@google.com CREATED:20170727T194857Z DESCRIPTION:Speaker: Jason Petta (Princeton)\n\nTitle: Coherent Coupling of a Single Spin to a Single Photon in Silicon\n\nAbstract: Electron spins in silicon quantum dots are attractive quantum bits (qubits) due to their lon g coherence times and the promise of rapid scaling using semiconductor fabr ication techniques. While nearest neighbor exchange coupling has been recen tly demonstrated in Si\, the interaction of spins via microwave frequency p hotons could enable long distance spin-spin coupling and “all-to-all” qubit connectivity. I will describe experiments where we couple a single spin in silicon to a single microwave frequency photon. The coupling mechanism is based on spin-charge hybridization in the presence of a strong magnetic fie ld gradient. Spin-cavity coupling rates gs/2π > 10 MHz are achieved and vac uum Rabi splitting is observed in the cavity transmission\, indicating sing le spin-photon strong coupling. These results open a direct path toward ent angling single spins at a distance using microwave frequency photons.\n\nHo st: Robert Throckmorton\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n\ nWhen: Tues\, Oct. 10 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Ph ysics Bldg.)\n LAST-MODIFIED:20170918T184255Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170328T171500Z DTEND:20170328T181500Z DTSTAMP:20260828T094430Z UID:0184u6vcjm6ik5353kfbjq5ok8@google.com CREATED:20170124T151143Z DESCRIPTION:Speaker Name: Dr. Jocelyn Rodgers\n\nSpeaker Institution: Maret School\, Washington DC\n\nTitle: Modeling Water and Ion Solvation using Mu ltipoles\n\nAbstract: The differences in the solvation of ions in water pla y an important role in chemistry and biology\, yet aspects of the solvation process for different ions remain difficult to capture in atomistic comput er simulations. One possible explanation for these difficulties lies in the form of the water model itself. A recently developed single-site-multipole (SSMP) model of water captures properties of liquid water over a range of temperatures and pressures with remarkable accuracy compared to both nonpol arizable and polarizable multi-site models. In this talk\, we introduce thi s model and discuss the application of this model to the solvation of anion s and cations. Through the inclusion of hexadecapole-monopole interactions\ , solvation of cations in SSMP water leads to agreement of the orientationa l distribution of water molecules around the cations with the ab initio mol ecular dynamics results\, unlike typical multi-site models. LAST-MODIFIED:20170328T121540Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Phyics Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180425T150000Z DTEND:20180425T160000Z DTSTAMP:20260828T094430Z UID:3ehbc3h0mse6ricnvtuad7l0v1@google.com CREATED:20180417T134100Z LAST-MODIFIED:20180419T173207Z LOCATION:Chemistry 0112 *(Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161105T140000Z DTEND:20161105T160000Z DTSTAMP:20260828T094430Z UID:j47nbhc68f68c2onvae119id7c@google.com CREATED:20160926T201717Z DESCRIPTION:Speaker: Chris Monroe\n\nRolling ripples of water on the surfac e of a pond\, the brilliant colors of a deep rainbow\, and Beethoven's symp honies all come to us in the form of waves. \n\nWhile we can all appreciate the beauty of these experiences without caring about the underlying physic s\, they become even more beautiful when we dive into their simple physical and mathematical description. \n\nThis lecture will explore the generation of sound\, what makes sound into music\, and how we perceive complex sound waves. \n https://sites.google.com/a/physics.umd.edu/saturday-morning-phys ics/home\n\n LAST-MODIFIED:20160926T201717Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: The Physics of Music TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160505T170000Z DTEND:20160505T180000Z DTSTAMP:20260828T094430Z UID:l6phol2n0v0t4686n0urj93afo@google.com CLASS:PUBLIC CREATED:20160421T143459Z DESCRIPTION:Speaker Name: Saurabh Paul \n\nSpeaker Institution: JQI\n\nTitl e: Multi-band bose-hubbard models and effective three-body interactions\n\ nAbstract: Experiments with ultracold atoms in optical lattice have become a versatile testing ground to study diverse quantum many-body Hamiltonians . A single-band Bose-Hubbard (BH) Hamiltonian was first proposed to describ e these systems in 1998 and its associated quantum phase-transition was sub sequently observed in 2002. Over the years\, there has been a rapid progres s in experimental realizations of more complex lattice geometries\, leading to more exotic BH Hamiltonians with contributions from excited bands\, and modified tunneling and interaction energies. There has also been interesti ng theoretical insights and experimental studies on "unconventional'' Bose- Einstein condensates in optical lattices and predictions of rich orbital ph ysics in higher bands. In this thesis\, I present our results on several mu lti-band BH models and emergent quantum phenomena. In particular\, I study optical lattices with two local minima per unit cell and show that the low energy states of a multi-band BH Hamiltonian with only pairwise interaction s is equivalent to an effective single-band Hamiltonian with strong three-b ody interactions. I also propose a second method to create three-body inter actions in ultracold gases of bosonic atoms in a optical lattice. In this c ase\, this is achieved by a careful cancellation of two contributions in th e pair-wise interaction between the atoms\, one proportional to the zero-en ergy scattering length and a second proportional to the effective range. I subsequently study the physics of Bose-Einstein condensation in the second band of a double-well 2D lattice and show that the collision aided decay r ate of the condensate to the ground band is smaller than the tunneling rate between neighboring unit cells. Finally\, I propose a numerical method usi ng the discrete variable representation for constructing real-valued Wannie r functions localized in a unit cell for optical lattices. The developed nu merical method is general and can be applied to a wide array of optical lat tice geometries in one\, two or three dimensions.​\n\nDissertation Committe e Chair: Prof. Steve Rolston\n\nCommittee: \n\nDr. Eite Tiesinga\n\nDr. Pau l Lett\n\nDr. Mohammad Hafezi\n\nDr. Dionisios Margetis\n LAST-MODIFIED:20160421T204500Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Doctoral Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170918T160000 DTEND;TZID=America/New_York:20170918T170000 DTSTAMP:20260828T094430Z UID:7lt08t63akq1aj04pdbnqlaibo@google.com RECURRENCE-ID;TZID=America/New_York:20170918T160000 CREATED:20170906T191250Z DESCRIPTION:Title : Reconstructing Visual Circuits with Volumetric Super-re solution Fluorescence Microscopy\nSpeaker Name: Colenso Speer\nSpeaker Inst itution : University of Maryland College Park\nNotes: http://www.marylandbi ophysics.umd.edu/seminars/\nAbstract : Light microscopy enables multi-color imaging\, analysis\, and live tracking of diverse cellular and molecular p rocesses and is a vital tool for neuroscience. In the last decade\, super-r esolution microscopy techniques have extended the spatial resolution of opt ical imaging to the nanoscale and enabled new investigations of the molecul ar organization and structural properties of synapses in the nervous system . In this talk I will introduce our laboratory’s efforts to apply STochasti c Optical Reconstruction Microscopy (STORM)\, a localization-based super-re solution imaging approach\, to the analysis of synaptic structure and conne ctivity in the brain. I will present an overview of STORM technology for ne ural circuit imaging including considerations for optimizing sample prepara tion\, super-resolution image quality\, and automated data analysis. I will present data demonstrating the imaging and analysis of synaptic inputs to morphologically identified neurons and introduce future directions for cell type-specific super-resolution imaging of functionally characterized circu its. Our group is developing and applying these tools to investigate the ac tivity-dependent and molecular mechanisms that regulate circuit assembly an d plasticity in the central nervous system\, using the mammalian visual sys tem as a model. We anticipate that volumetric super-resolution microscopy w ill provide important new structural and molecular imaging data that will c omplement the connectomic reconstruction of visual circuits by electron mic roscopy. \n\nsnejjar@umd.edu LAST-MODIFIED:20170906T191459Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161117T173000Z DTEND:20161117T183000Z DTSTAMP:20260828T094430Z UID:hn13ktu4joqkqnurcn5voph1vo@google.com CREATED:20160825T184149Z DESCRIPTION:Speaker Name: William Dorland\n\nSpeaker Institution : Universi ty of Maryland College Park\n\nTitle : ECHO\, ECHo\, Echo\, echo... When Ec hoes Overwhelm Landau Damping\n\nAbstract : The Liouville equation describi ng a collection of charged particles is time-reversible. In the weakly coup led limit\, one can reduce this equation to a Fokker-Planck equation\, whic h is irreversible. The problem of the fate of electromagnetic field fluctua tions in a plasma in the limit of very weak irreversibility was addressed b y Landau\, who demonstrated that as long as there are some collisions (even if rare)\, and in the absence of sources\, gradients\, etc\, typical field fluctuations are damped with an easily calculated "collisionless" damping rate -- this is Landau damping. The energy of the field fluctuations is con verted to particle energy\; there is irreversible heating. Landau's calcula tion is fine in the limit of small amplitude fluctuations\, but what happen s when the plasma is turbulent? I will show that in a typical nonlinear sys tem (relevant to many physical observations)\, Landau damping is overwhelme d and ultimately arrested by turbulent "echoes". This finding has important implications for detailed predictions of the heating (and in some cases\, for the luminosity) of some interesting astrophysical plasmas. LAST-MODIFIED:20160826T142508Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - ECHO\, ECHo\, Echo\, echo... When Echoes Overwhelm Landau Damping TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180305T203000Z DTEND:20180305T213000Z DTSTAMP:20260828T094430Z UID:4p5utgechd6j5to7k9hsd6h94j@google.com CREATED:20180302T211154Z DESCRIPTION:
Title : "Formation of Double Neutron Stars and Implications for Heavy Element Production" \;
Speaker Name: Paz Beniamini& nbsp\;
Speaker Institution : George Washington University
Notes: Refreshments available beginning at \;3:00 PM.
Abstract : Observations of DNS syst ems in our Galaxy suggest that the formation of the second born NS in most systems involves a very weak explosion\, rather than a more "traditional" S Ne. This allows us to estimate the typical center of mass velocities and ti me until merger for double neutron star systems. We find that more than hal f of the systems are slow enough and merge rapidly enough to be able to acc ount even for the recent observations of r-process elements in ultra-faint dwarf galaxies. Furthermore\, assuming that the explosion energy is less th an 10^52 erg and that the galaxies haven't lost most of their gas before th e r-process event\, we can expect most of the r-process material to be reta ined even in faint dwarfs. At the same time\, observations of the Eu abunda nces in dwarf galaxies lead to model independent estimates of the rate and mass per event of r-process formation. These suggest rates between 2*10^(-4 ) and 10^(-2) per ccSNe and Eu masses between 10^(-5)M_sun and 2*10^(-4)M_s un. Both values rule out regular SNe as the sources of r-process events and are consistent with expectations for the DNS merger hypothesis. Finally\, we show that faint dwarf galaxies are consistent with being the 'building b locks' of the Galactic halo\, and provide a natural explanation for the mea n value and fluctuations in the abundances of Galactic halo metal poor star s.
Title of Event: \; LAST-MODIFIED:20180302T211318Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180921T160000Z DTEND:20180921T164500Z DTSTAMP:20260828T094430Z UID:12dpdj84hkhhkdspma71ukfurl@google.com CREATED:20180919T210131Z DESCRIPTION:Title: Modular Architectures for Quantum Systems\n\nSpeaker: Za chary Eldredge\, JQI and QuICS\n\nAbstract: As we seek to scale up small qu antum devices into general-purpose quantum computers\, we will need to deve lop also the tools for designing large-scale architectures. In this talk I will discuss some of the challenges involved in trying to evaluate differen t potential architectures and introduce a family of graphs called hierarchi es which seem like excellent candidates. I will then describe the process o f benchmarking quantum architectures by using entanglement measures to defi ne the capability of the network to create large\, highly-entangled states\ , describing how this can be done in both unitary and non-unitary cases.\n\ nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20180919T210425Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170925T110000 DTEND;TZID=America/New_York:20170925T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20170925T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Jon Simon\, Chicago\nTitle: Building Correlated and To pological Quantum Matter from Light\nAbstract: In this talk I will discuss ongoing efforts in my group exploring topological- and strongly-interacting - phases of light. I will begin with our observation of photonic Landau lev els in curved space\, created by trapping light in twisted (non-planar) opt ical cavities\, and culminating in the first measurement of the mean orbita l spin of integer Hall state\, a normally-inaccessible topological quantum number\, along with a direct measurement of the Chern number using Kitaev’s real-space formalism. I will then discuss our recent demonstration of coll iding cavity Rydberg polaritons\, plus ongoing efforts to load the polarito ns into a twisted cavity to create Laughlin states. I will conclude by summ arizing a collaboration with the Schuster lab where we have recently create d both a photonic Chern insulator and a dissipatively stabilized photonic M ott insulator. LAST-MODIFIED:20170922T123624Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180913T123000 DTEND;TZID=America/New_York:20180913T133000 RRULE:FREQ=WEEKLY;UNTIL=20181207T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20181122T123000 EXDATE;TZID=America/New_York:20180913T123000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com CREATED:20180827T142930Z DESCRIPTION:Speaker: TBA\nAffiliation TBA\nTitle: TBA\nAbstract: TBA LAST-MODIFIED:20180827T143331Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170329T190000Z DTEND:20170329T200000Z DTSTAMP:20260828T094430Z UID:8o0dkossgkpa5i2id66tdlnlb8@google.com CREATED:20170207T201344Z DESCRIPTION:Speaker Name: Prof. Philip Johnson\n\nSpeaker Institution : Dep artment of Biology\, University of Maryland\, College Park\n\nTitle : Reach ing back in time with ancient DNA: opportunities and challenges \n\nAbstra ct : Classically\, the field of evolutionary biology compares present-day c haracteristics (both molecular and morphological data) together with morpho logical data from fossils to make inferences about evolutionary relationshi ps and trajectories. However\, technology now allows ancient DNA to be reco vered from fossils up to 700\,000 years old. The addition of time-series sa mples to molecular evolutionary analyses greatly increases their power to d etect events such as selection and admixture. Not surprisingly\, this fanta stic ability brings challenges as well. In particular\, contamination by mo dern humans remains a nagging concern for ancient DNA studies\, particularl y when studying ancient hominins. I will discuss different computational/th eoretical approaches for handling this challenge. LAST-MODIFIED:20170327T125908Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180418T170000Z DTEND:20180418T183000Z DTSTAMP:20260828T094430Z UID:6kkh7pghuk7i8lbd7buehhseed@google.com CREATED:20180118T195017Z DESCRIPTION:Speaker: Scott Lawrence\n \nSpeaker Institution: University of Maryland\n \nTitle: Beyond Thimbles: Integration Contours to Solve a Sign P roblem\n\nAbstract: For finite-density fermionic field theories\, lattice M onte Carlo methods fail because\nthe Boltzmann weight $e^{-S}$ includes a r apidly oscillating phase. Resolving\nthe cancellations introduced by these oscillations is too computationally\nexpensive to be practical: this is the fermion sign problem.\n\nThe sign problem can be evaded evaluating the dis crete path\nintegral not over the real plane\, but over another integration contour of our\nchoosing. In this talk I will describe this procedure\, as well as different\nmethods of constructing efficient contours for integrat ion. Results of these\nmethods\, applied to finite-density fermionic theori es in 1+1 and 2+1 theories\,\nare shown. LAST-MODIFIED:20180412T201640Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180320T160000 DTEND;TZID=America/New_York:20180320T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180320T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name:\n\nSpeaker Institution: \n\nTitle:\n\nAbstract: LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium - No Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170314T171500Z DTEND:20170314T181500Z DTSTAMP:20260828T094430Z UID:flgb304tt9gqdshput2vrsshg4@google.com CREATED:20170306T152732Z DESCRIPTION:Speaker: Professor Chris Jarzynski\n\nSpeaker Institution: IPST \, UMCP\n\nTitle: Connecting Thermodynamics to Statistical Mechanics in the Strong System-environmental Coupling Regime\n\nAbstract: Stochastic thermo dynamics describes how the first and second laws of thermodynamics "scale d own" to microscopic systems of interest. In this field\, and in textbook di scussions\, it is customary to use the canonical ensemble to represent the equilibrium state of a system that is in contact with a thermal reservoir. Familiar macroscopic relations between internal energy\, entropy\, free ene rgy\, heat and work are easily derived from the canonical distribution. It is known\, however\, that the canonical ensemble does not accurately descri be a nanoscale system that is strongly coupled to its surroundings\, such a s a biomolecule in aqueous solution. The usual connection between thermodyn amics and statistical mechanics cannot easily be invoked in this situation. \n\n I will discuss a modified thermodynamic framework that describes a cl assical system of interest of arbitrary size that is strongly coupled to it s thermal environment. Seven key thermodynamic quantities - internal energy \, entropy\, volume\, enthalpy\, Gibbs free energy\, heat\, and work - are defined microscopically within this framework. These quantities obey thermo dynamic relations including both the first and second law\, and they satisf y nonequilibrium fluctuation theorems. Additionally\, these key quantities scale up to their macroscopic values when the system of interest is large. Thus a unifying framework is developed\, which encompasses microscopic\, st ochastic thermodynamics at one end\, and traditional macroscopic thermodyna mics at the other. A central element in this approach is a thermodynamic de finition of the volume of the system of interest\, which converges to the u sual geometric definition when the system is large. \n\nhttp://jacobi.umd.e du/statphys/Jarzynski_Mar14_2017.html\n\nA thirty-minute version of this ta lk will be presented at the APS March Meeting in New Orleans\, on Thursday\ , March 16. LAST-MODIFIED:20170306T153401Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Connecting Thermodynamics to Statistical Mechanics in the Strong Sy stem-environment Coupling Regime TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180418T190000Z DTEND:20180418T200000Z DTSTAMP:20260828T094430Z UID:56er7qo012dq0ve05cebs2cs3o@google.com CREATED:20180412T211819Z DESCRIPTION:

Speaker: \; \;Prof. Brian Swingle

Affiliation: Joint Center for Quantum Information and Computer Scie nce\, University of Maryland\, College Park

Title:&n bsp\;Tensor Networks and Near-Term Quantum Devices

Abstract: \;As quantum devices become increasing ly sophisticated\, our ability to classically simulate their physics is cha llenged. At the same time\, these quantum devices open up new possibilities for intrinsically quantum computations that may shed light on hard problem s in quantum physics. However\, near-term devices will be inherently noisy\ , and we expect that noise makes it easier to simulate a quantum system and makes the quantum system less useful for coherent computations. In this ta lk\, I'll show how tensor networks are challenging some of these expectatio ns\, by giving new methods to reliably calculate quantum dynamics in large systems and giving suggesting new\, useful computations that inherently noi se resilient.

LAST-MODIFIED:20180413T171919Z LOCATION:LPS Downstairs Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180423T120000Z DTEND:20180423T210000Z DTSTAMP:20260828T094430Z UID:2p8hfr5jn1a01mp6had5jgcn11@google.com CREATED:20180329T154336Z DESCRIPTION:

Further info and registration:

https://energy.umd.edu/event/13162/2018-engineering-sustai nability-day

Catherine Stephens
301 405 9378
csteph5@umd.edu LAST-MODIFIED:20180329T154336Z LOCATION:Clark Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Energy Sustainibilty Day TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160506T161500Z DTEND:20160506T171500Z DTSTAMP:20260828T094430Z UID:vu1qb9sq1m09f634bcimlus0g8@google.com CREATED:20160429T192047Z DESCRIPTION:Speaker: Aaron Lee\n\nSpeaker Affiliation: JQI\n\nFree lunch se rved at 12:00\n\nTitle: Observation of prethermalization in trapped ion qua ntum spin chains\n\nAbstract: We present experimental investigations of qua ntum thermalization in a precisely controlled\, interacting\, 171Yb+ spin c hain\, with up to 22 ions. We quench the trapped ion spins in a quantum man y-body Hamiltonian with single-atom addressing techniques and measure the l ong-term dynamics with single-site resolution. With a long-range transverse Ising model spin Hamiltonian\, we observe emergence of an exotic pretherma l phase in the quench dynamics. This non-trivial prethermal phase arises fr om an inhomogeneous effective potential landscape\, due to a combination of the long-range interactions and the open boundary condition.\n LAST-MODIFIED:20160429T192047Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160414T154500Z DTEND:20160414T171500Z DTSTAMP:20260828T094430Z UID:9i4bblupdamk77jouchjh8kgi4@google.com CLASS:PUBLIC CREATED:20160405T151535Z DESCRIPTION:Joint Quantum Institute Career Seminar\n2115 CSS Building\, 11: 45 a.m.\, Thursday\, April 14\, 2016\n\nThere is too such a thing as a free lunch\, but only for students and postdocs!\n\nNano could be huge\, someda y\n\nJason E. Sanabia\nPresident and CEO\nRaith America\, Inc.\n1377 Long I sland Motor Parkway\nIslandia\, NY 11749\n\nRaith is a nanotechnology firm offering innovative instrument solutions for electron and ion beam lithogr aphy\, nanofabrication\, nano-engineering\, and reverse engineering applica tions. Raith systems are manufactured in Dortmund\, Germany and in Best\, N etherlands with a worldwide installation base at universities\, government laboratories\, and private industries. \n\nOur customers are pushing the li mits of high performance nanolithography in fields such as optics and commu nications\, plasmonics\, and compound semiconductors. These sophisticated a pplications require a high degree of placement accuracy\, fidelity\, repeat ability\, and stability from our systems. We are always looking for associa tes who can understand how thermal expansion coefficients can wreak havoc a t the nanoscale\, how charged particle optics ensure that electron and ions are put to good use\, and how ultra-accurate mechanical systems employ the same technology that was recently used to detect gravitational waves!\n\nT o maintain a high level of system performance for our customers\, Raith Ame rica has assembled a dedicated and experienced team of regional service and support engineers\, and is looking to increase our presence in the Baltimo re/DC region.\n\nAbout the speaker:\n\nJason Sanabia graduated from Union C ollege in 1996 with a BS in Physics. During a summer in Gaithersburg in the Summer Undergraduate Research Fellowship (SURF) program at the National In stitute of Standards and Technology\, he became aware of the University of Maryland\, and subsequently enrolled in its the Chemical Physics Program. H e received a Ph.D. in Chemical Physics in 2000 for studies of electron scat tering by molecules on surfaces. After a National Research Council Postdoct oral Research Associateship at NIST\, he joined Raith GmbH\, a major manufa cturer of nanofabrication tools\, and has since become President and CEO of Raith\, America\, Inc. An avid Chesapeake Bay fisherman while s student a t UMCP\, Jason is now regularly seen in his sailboat with son and daughter in Long Island Sound.\n LAST-MODIFIED:20160412T153207Z LOCATION:CSS 2115\, University of Maryland SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Career Seminar: Jason Sanabia TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170509T171500Z DTEND:20170509T181500Z DTSTAMP:20260828T094430Z UID:onil382j6sjqcad0om2fvra5ms@google.com CREATED:20170327T175155Z DESCRIPTION:\n\n\n\n LAST-MODIFIED:20170503T125823Z LOCATION:IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180327T171500Z DTEND:20180327T181500Z DTSTAMP:20260828T094430Z UID:67q16rb425pnjjcb9i7b53mv3s@google.com CREATED:20180322T143839Z DESCRIPTION:Speaker: Professor John Perdew\, Temple University
Title: The SCAN Density Functional: the Predictive Power of 17 Exa ct Constraints

Abstract: \;Kohn-Sham density functional t heory in principle predicts the exact ground-state energy and electron dens ity of a many-electron system via the solution of self-consistent one-elect ron Schrödinger equations. Only the exchange-correlation energy as a funct ional of the density needs to be approximated. For discovery of new molecul es and materials\, the approximations need to be computationally efficient\ , predictive\, and usefully accurate. The SCAN (strongly constrained and ap propriately normed) meta-generalized gradient approximation was constructed [1] to satisfy all 17 known exact constraints that a semi-local functional can satisfy (compared to 11 for the PBE GGA). SCAN is further fitted to ap propriate norms\, non-bonded systems for which a semi-local functional can be accurate for exchange and correlation separately. SCAN recognizes and pr ovides different GGA-like descriptions for covalent single bonds\, metallic bonds\, and van der Waals (vdW) bonds. Here I will review the functional i tself\, along with its long-range vdW extension SCAN+rVV10 [2]. I will also review applications to properties of diversely-bonded systems [3]\, includ ing ferroelectricity [4]\, density and structure of liquid water [5]\, crys tal structure stability [6]\, surface properties of transition metals [7]\, and critical pressures for structural phase transitions of semiconductors [8]. The accuracy of SCAN is often comparable to or better than that of a h ybrid functional\, at lower computational cost and without any fitting to b onded systems. \;
*Supported by NSF DMR-1607868 and DOE SC0012575.

[1] J. Sun\, A. Ruzsinszky\, and J.P. Perdew\, Phys. Rev. Lett. 11 5\, 036402 (2015).
[2] H. Peng\, Z. Yang\, J. Sun\, and J.P. Perdew\, Phys. Rev. X 6\, 041005 (2016).
[3] J. Sun et al.\, Nat. Chem. 8\, 83 1 (2016).
[4] A. Paul et al.\, Phys. Rev. B 95\, 054111 (2017).
[ 5] M. Chen et al.\, Proc. Nat. Acad. (USA) 114\, 10846 (2017).
[6] Y. Zhang et al.\, Phys. Rev. B 96\, 035143 (2017).
[7] A. Patra et al.\, Proc. Nat. Acad. (USA) 114\, E9188 (2017).
[8] C. Shahi et al.\, Phys . Rev. B\, to appear. \; LAST-MODIFIED:20180322T143839Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161112T150000Z DTEND:20161112T170000Z DTSTAMP:20260828T094430Z UID:1pojs0ed3nqgr992ls6p1ued8g@google.com CREATED:20160926T201807Z DESCRIPTION:Speaker: Carter Hall\n\n \n https://sites.google.com/a/physics. umd.edu/saturday-morning-physics/home\n\n LAST-MODIFIED:20160926T201807Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Neutrino Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161007T190000Z DTEND:20161007T200000Z DTSTAMP:20260828T094430Z UID:7qiq1g4shoe813a0eggahub4dg@google.com CREATED:20160811T130946Z DESCRIPTION:Speaker: Jennifer Paykin\n\nSpeaker Affiliation: U. Penn\n\nTit le: Qwire: A Core Language for Quantum Circuits\n\nAbstract: The QRAM model of quantum computing describes how a (hypothetical) quantum computer and a classical computer work together to produce sophisticated quantum algorith ms. The classical computer handles the bulk of the computation and sends ci rcuits to the quantum computer for execution. In this talk I will introduce the Qwire circuit language\, which encodes circuits in a classical program ming language of our choice and facilitates communication with an attached quantum computer. Qwire uses linear types to ensure that circuits are well- formed and has a sound operational semantics that reduces circuits to a sma ll set of normal forms. In addition\, the language is highly modular as it can be embedded into an arbitrary host language that treats circuits as fir st-class data. LAST-MODIFIED:20160929T124937Z LOCATION:3100A Computer and Space Science Building SEQUENCE:3 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160414T123000 DTEND;TZID=America/New_York:20160414T133000 RRULE:FREQ=WEEKLY;UNTIL=20160421T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8@google.com CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Denys Bondar\n\nSpeaker Institution: Princeton U niversity\, Department of Chemistry\n\nTitle: Measurement inspired modeling of quantum and classical dynamical systems \n\nAbstract: In this talk\, I will provide an answer to the question: “What kind of observations and assu mptions are minimally needed to formulate a physical theory?” Our answer to this question leads to the new systematic approach of Operational Dynamica l Modeling (ODM)\, which allows to deduce equations of motions from time ev olution of observables. Using ODM\, we are not only able to re-derive well- known physical theories (such as the Schrodinger and classical Liouville eq uations)\, but also infer novel physical dynamics (and solve open problems) in the realm of non-equilibrium quantum statistical mechanics. LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170927T190000Z DTEND:20170927T200000Z DTSTAMP:20260828T094430Z UID:13131dgp6prn18ec9d7hjmaglo@google.com CREATED:20170925T133017Z DESCRIPTION:Speaker: Prof. Geoff Brennecka\n\nTitle: Coupled High Throughp ut Computation and Experimentation for Rapid Screening and Demonstration of New Piezoelectric Nitrides\n\nAbstract:\nAluminum nitride (AlN) thin films have come to dominate a significant subset of the piezoelectric microelect romechanical systems (piezoMEMS) device world despite exhibiting what can o nly be described as modest electromechanical properties. In recent years\, the AlN-ScN system has received significant interest for its widely-reporte d increases in field-induced strain. Inspired by the massive property enhan cements achievable near phase boundaries in oxide piezoelectrics and armed with high-throughput computational as well as experimental capabilities\, w e have embarked on a study to develop new piezoelectric nitride materials b ased on the concept of flattened free energy landscapes. Thermochemical cal culations help to identify compounds and alloy compositions where one or mo re unstable forms exist in close energetic proximity to the stable form. Ca lculations based on density functional theory (DFT) provide a theoretical b ackdrop of the expected intrinsic properties of these various materials\, w hich we are able to confirm via thin film sample libraries deposited using combinatorial multi-target reactive sputtering and parallelized measurement and characterization tools. Progress to-date includes an in-depth mechanis tic study of the entire AlN-ScN phase diagram as well as screening studies of AlN modified with other trivalent cations. Exploratory work on perovskit e nitrides and pseudo-2D piezoelectrics will also be discussed. LAST-MODIFIED:20170925T133017Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170201T200000Z DTEND:20170201T210000Z DTSTAMP:20260828T094430Z UID:pcj9l1jkdbu5740bmr0lv8cito@google.com CLASS:PUBLIC CREATED:20170124T152335Z DESCRIPTION:Qi-Yu Liang\n\nMIT\n\nTitle: Observation of a three-photon boun d state\n\nAbstract: \nBound states of massive particles\, be it in the for m of nucleons\, atoms or molecules\, are ubiquitous\, and constitute the bu lk of the visible world around us. In contrast\, photon-photon interactions are weak and need to be specifically engineered in the form of nonlinear o ptical media. Here we report the observation of a three-photon bound state inside a quantum nonlinear optical medium. The strong photon-photon interac tion is achieved by coupling the light to highly excited\, strongly interac ting Rydberg states in a cold atomic gas. The photonic trimer is observed v ia bunching and a strongly nonlinear phase in the three-photon correlation function of the emerging light. The observations are quantitatively describ ed by an effective field theory of Rydberg-induced photon-photon interactio ns\, and agree with direct numerical simulations. This work paves the way t owards the realization\, understanding\, and control of strongly interactin g quantum gases of light.\n LAST-MODIFIED:20170124T152335Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171002T203000Z DTEND:20171002T213000Z DTSTAMP:20260828T094430Z UID:5lfhjud5o6u3hl4cp4005hn3gh@google.com CREATED:20170928T145841Z DESCRIPTION:Title : A New Look at the TeV Sky with the HAWC Gamma Ray Obser vatory\nSpeaker Name: Jordan A. Goodman\nSpeaker Institution : University o f Maryland\nNotes:\nAbstract : The High Altitude Water Cherenkov (HAWC) Gam ma-ray Observatory in the high mountains of Mexico was completed in March o f 2015 and is now giving us a new view of the TeV sky. HAWC is 15 times mor e sensitive than the previous generation of widefield EAS gamma-ray instrum ents and is able to detect the Crab nebula at >5σ with each daily transit. This talk will present results from the HAWC sky catalog including our stud y of the galactic plane showing more than a dozen new sources not yet detec ted by IACTs as well as spectra and morphology of bright sources. HAWC data has revealed new classes of TeV sources including local pulsars that have been thought to contribute to the observed positron excess. We will show ho w HAWC data constrain this flux. We will also present data showing the high est energy view of the sky (above 50 TeV). In addition\, results of our mon itoring of transient will be presented. LAST-MODIFIED:20170928T150005Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170511T193000Z DTEND:20170511T203000Z DTSTAMP:20260828T094430Z UID:d5f6eara2r7uf9ke95oset3spg@google.com CREATED:20170405T203430Z DESCRIPTION:Speaker Name: Tim Linden \n\nSpeaker Institution : Ohio State U niversity\n\nTitle : JSI Special Seminar: "Utilizing HAWC Observations to S hed Light on Milky Way Pulsars"\n\nAbstract : Recent HAWC observations have found extended TeV emission coincident with the Geminga and Monogem pulsar s. In this talk\, I will show that these detections have significant implic ations for our understanding of pulsar emission. First\, the spectrum and i ntensity of these "TeV Halos" indicates that a large fraction of the pulsar spindown energy is efficiently converted into electron-positron pairs. Thi s provides observational evidence supporting pulsar interpretations of the rising positron fraction observed by PAMELA and AMS-02. Second\, the isotro pic nature of this emission provides a new avenue for detecting nearby puls ars with radio beams that are not oriented towards Earth. I will also discu ss the implications of HAWC results for our understanding of the diffuse Te V gamma-ray and neutrino sky.\n\nNotes: Refreshments available at 3 PM. LAST-MODIFIED:20170504T130454Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181207T180000Z DTEND:20181207T190000Z DTSTAMP:20260828T094430Z UID:5a6imo1q5us5fankuq5q9g8ccp@google.com CREATED:20180905T153635Z LAST-MODIFIED:20180905T153635Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar - NO SEMINAR - FACULTY MEET ING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170217T171500Z DTEND:20170217T181500Z DTSTAMP:20260828T094430Z UID:2i0rq2j1e66sk0a9qkc0gpkgk8@google.com CREATED:20170208T193255Z DESCRIPTION:Speaker Name: Xunnong Xu\n\nSpeaker Institution: JQI\n\nTitle: Optomechanically-induced chiral transport of phonons in one dimension\n\nAb stract: Non-reciprocal devices\, with one-way transport properties\, form a key component for isolating and controlling light in photonic systems. Opt omechanical systems have emerged as a potential platform for optical non-re ciprocity\, due to ability of a pump laser to break time and parity symmetr y in the system. Here we consider how the non-reciprocal behavior of light can also impact the transport of sound in optomechanical devices. We focus on the case of a quasi one dimensional optical ring resonator with many mec hanical modes coupled to light via the acousto-optic effect. The addition o f disorder leads to finite diffusion for phonon transport in the material\, largely due to elastic backscattering between clockwise and counter-clockw ise phonons. We show that a laser pump field\, along with the assumption of high quality-factor\, sideband-resolved optical resonances\, suppresses th e effects of disorder and leads to the emergence of chiral diffusion\, with direction-dependent diffusion emerging in a bandwidth similar to the phase -matching bandwidth for Brillouin scattering. A simple diagrammatic theory connects the observation of reduced mechanical linewidths directly to the a ssociated phonon diffusion properties\, and helps explain recent experiment al results. LAST-MODIFIED:20170208T193255Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180926T150000Z DTEND:20180926T160000Z DTSTAMP:20260828T094430Z UID:5t1lgntd66i0q2em0ini968re6@google.com CREATED:20180905T134228Z DESCRIPTION:Speaker: Aleksandr Noy\, Lawrence Livermore National Laborat ory

Title: Molecular Transport and Nanoscale Confineme nt in Carbon Nanotube Porins

Abstract: Controlling ion and water transport on a molecular scale is important for
applicati ons ranging from industrial water treatment\, to membrane
separations\, to bioelectronic interface design. Living systems move ions and
small mo lecules across biological membranes using protein pores that rely on
nan oscale confinement effects to achieve efficient and exquisitely-selectivetransport. I will show that carbon nanotube porins—pore channels formed b y
ultra-short carbon nanotubes assembled in a lipid membrane—can exploit
similar physical principles to transport water\, protons\, and small io ns with
efficiency that rivals and sometimes exceeds that of biological channels. I will
discuss the role of molecular confinement in these pore s and show how it can
enhance water and proton transport efficiency and influence the
mechanisms of ion selectivity in these pores. Overall\, ca rbon nanotube porins
represent simple and versatile biomimetic membrane pores that are ideal for
studying nanoscale transport phenomena and buil ding the next generation
of separation technologies and biointerfaces. LAST-MODIFIED:20180917T143836Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171113T110000 DTEND;TZID=America/New_York:20171113T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171113T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Alipasha Vaziri\, Rockefeller University\n\nTitle: Vis ual Perception at the threshold\n\nAbstract: Optical technologies have been transformative for our current understanding of structure and function of neuronal circuits underlying behavior and are in many cases the limiting fa ctors for pushing our understanding of the brain forward. \nIn vision scien ce despite of investigations for over seventy years\, the absolute limits o f human vision have remained unclear. Rod cells have been shown to respond to individual photons\, yet whether this information is processed by the br ain and is accessible on the behavioral level has remained a fundamental op en question. We have recently been able to show that humans can report a si ngle photon incident on the eye with an above chance probability [1]. This was achieved by combining a two-alterative forced choice psychophysics proc edure with a single photon source base on Type-I Spontaneous Parametric Dow n-Conversion (SPDC)\, a tool that allows to eliminate the irreducible varia bility of photon numbers in previous experiments. Furthermore\, we found th at the probability for reporting a single photon is modulated by the presen ce of an earlier photon. Our results and other applications of this tool ma y open up fundamentally new avenues for investigating yet undiscovered reti nal pathways using quantum technologies and may find applications in fundam ental tests of quantum mechanics using human observers. \n\nReferences:\n1. Tinsley\, J. et al. Direct Detection of a Single Photon by Humans\, Nature Communications\, (2016) 7\, 12172 LAST-MODIFIED:20171027T131739Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170914T140000 DTEND;TZID=America/New_York:20170914T153000 DTSTAMP:20260828T094430Z UID:01ridjaq5adde9chm46676q241@google.com RECURRENCE-ID;TZID=America/New_York:20170914T140000 CREATED:20170908T131846Z DESCRIPTION:Collin Broholm\, Johns Hopkins University\n\nTitle: Incommensur ate magnetism in heavy fermion systems\n\nAbstract: Neutrons and muons were used to explore CeNiAsO and CeAuSb2. The initial instability of the heavy fermion state yields long-wavelength amplitude-modulated SDWs. Analyzing cr ystal field excitations\, we show CeNiAsO is an easy plane system. There is a lower T transition to a commensurate non-collinear state that may result from bi-quadratic interactions. CeAuSb2 is Ising like and the orthorhombic amplitude modulated state is stable to the lowest T. A B-field applied alo ng c yields an incommensurate 2-Q state. Transport anomalies indicate signi ficant modifications in electronic structure that we discuss considering th e new information about spin correlations.\n\n[1] Shan Wu and Guy Marcus ar e major contributors to this work that was supported by the U.S. Department of Energy\, Office of Basic Energy Sciences\, Division of Material Science s and Engineering under Grant No. DE-FG02-08ER46544.\n\nRefreshments are se rved at 1:30pm in the lobby of Toll Physics\n\nHOST: Johnpierre Paglione\n LAST-MODIFIED:20170914T123940Z LOCATION:1201 Toll Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Collin Broholm\, JHU TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160721T150000Z DTEND:20160721T160000Z DTSTAMP:20260828T094430Z UID:9n5ni92df19k0q958et4nciq6g@google.com CREATED:20160708T145451Z DESCRIPTION:Speaker: Christopher Granade\n\nSpeaker Affiliation: University of Sydney\n\nTitle: Rejection and Particle Filtering for Hamiltonian Learn ing\n\nAbstract: Many tasks in quantum information rely on accurate knowled ge\nof a system's Hamiltonian\, including calibrating control\,\ncharacteri zing devices\, and verifying quantum simulators. In\nthis talk\, we pose th e problem of learning Hamiltonians as\nan instance of parameter estimation. We then solve this problem\nwith Bayesian inference\, and describe how rej ection and particle\nfiltering provide efficient numerical algorithms for l earning\nHamiltonians. Finally\, we discuss how filtering can be combined w ith\nquantum resources to verify quantum systems beyond the\nreach of class ical simulators. LAST-MODIFIED:20160708T145451Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171113T213000Z DTEND:20171113T223000Z DTSTAMP:20260828T094430Z UID:1u89a329h8jebbj7nr3c7c0c0v@google.com CREATED:20171102T185229Z DESCRIPTION:Title : New Measurements of Suprathermal Ions\, Energetic Parti cles\, and Cosmic Rays in the Outer Heliosphere from the New Horizons PEPSS I Instrument\nSpeaker Name: Matthew E. Hill \nSpeaker Institution : Johns H opkins University Applied Physics Laboratory\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : During the period from January 2012 to December 20 17 the New Horizons spacecraft traveled from 22 to 41 AU from the Sun\, mak ing nearly continuous interplanetary plasma and particle measurements utili zing the SWAP and PEPSSI instruments. We report on newly extended measurem ents from PEPSSI (Pluto Energetic Particle Spectrometer Science Investigati on) that now bring together suprathermal particles above ~2 keV/nuc (includ ing interstellar pickup ions)\, energetic particles with H\, He\, and O com position from ~30 keV to ~1 MeV\, and cosmic rays above ~65 MeV (with effec tive count-rate-limited upper energy of ~1 GeV). Such a wide energy range allows us to look at the solar wind structures passing over the spacecraft\ , the energetic particles that are often accelerated by these structures\, and the suppression of cosmic rays resulting from the increased turbulence inhibiting cosmic ray transport to the spacecraft position (i.e.\, Forbush decreases). This broad perspective provides simultaneous\, previously unat tainable diagnostics of outer heliospheric particle dynamics and accelerati on. Besides the benefit of being recent\, in-ecliptic measurements\, unlik e the historic Voyager 1 and 2 spacecraft\, these PEPSSI observations are a lso totally unique in the suprathermal range\; in this region only PEPSSI c an span the suprathermal range\, detecting a population that is a linchpin to understanding the outer heliosphere. LAST-MODIFIED:20171102T185229Z LOCATION:Atlantic Building Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170405T200000Z DTEND:20170405T210000Z DTSTAMP:20260828T094430Z UID:ttqb12u7r86fgpp9ho91kk9egs@google.com CREATED:20170328T201227Z DESCRIPTION:Speaker Name: Dr. Colin Komar\n\nSpeaker Institution : Catholic University/NASA Goddard\n\nTitle : Electron Drift Resonance in the MHD-cou pled Comprehensive Inner Magnetosphere Ionosphere model\n\nAbstract : Encir cling Earth are two donut-shaped structures called the radiation belts\, wh ich contain vast quantities of electrons and ions. The outer radiation belt exists between 3 and 7 Earth radii\, consisting primarily of electrons tra veling between 20% and 99.5% the speed of light. The dynamics of the electr ons in this region of space are important to understand as orbiting telecom munication satellites are continuously bathed in relativistic electron radi ation. Relativistic electrons in the outer radiation belt are highly dynami c and respond to interplanetary solar wind structures interacting with the Earth's magnetic field. A known mechanism of electron radial transport and energization resulting from the drift-resonant interaction with ultra-low f requency (ULF) waves. \n\nTo understand the electron drift-resonant interac tion with ULF waves\, we perform global simulations using conditions that a re known to efficiently generate ULF waves in Earth’s magnetic field. This talk will present results from simulations modeling the ring current and ra diation belt electron populations in the bounce-averaged\, kinetic Comprehe nsive Inner Magnetosphere-Ionosphere (CIMI) code coupled with the Block Ada ptive Tree Solar Wind Roe-type Upwind Scheme (BATS-R-US) global magnetosphe ric magnetohydrodynamic (MHD) code using an idealized ULF wave solar wind d ensity driver. ULF waves generated with 10 minute periods (1.67 mHz frequen cy) in the MHD model are characterized and the corresponding energization o f electrons and radial transport of electron phase space density is present ed. The drift-resonant electron energy is determined in the simulation and is consistent with the resonant energy of electrons within a pure dipole ma gnetic field. I will discuss the success of such a modeling approach\, whic h enables future studies to further investigate the drift-resonant interact ion resulting from other ULF wave sources and to additionally understand th e complicated interplay of other wave-particle interactions resulting in gl obal electron dynamics in Earth's radiation belts.\n\n LAST-MODIFIED:20170403T153319Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161031T170000Z DTEND:20161031T183000Z DTSTAMP:20260828T094430Z UID:9niht4c168o0lmqun83r6k2nu4@google.com CREATED:20161014T142154Z DESCRIPTION:SPEAKER: Johanne Chitzanidis\, National Center for Scientific Research "Demokritos"\, Heraklion\, Greece\n\nTITLE: Robust chimera states in SQUID metamaterials with local interactions\n\nABSTRACT: Chimera state s are complex spatio-temporal patterns that consist of coexisting domains o f spatially coherent and incoherent dynamics. This counterintuitive phenome non was first observed in 2002 in systems of identical oscillators with sym metric coupling topology. During the last decade\, chimera states have been theoretically investigated in a wide range of networks\, where different k inds of coupling schemes varying from regular nonlocal to completely random topology have been considered. Potential applications of chimera states in nature include the phenomenon of unihemispheric sleep in birds and dolphin s\, bump states in neural systems\, power grids\, and social systems. \n\nW e report on the emergence of robust multi-clustered chimera states in a dis sipative-driven system of symmetrically and locally coupled identical SQUID oscillators. The "snake-like" resonance curve of the single SQUID (Superco nducting QUantum Interference Device) is the key to the formation of the ch imera states and is responsible for the extreme multistability exhibited by the coupled system that leads to attractor crowding at the geometrical res onance (inductive-capacitive) frequency. Until now\, chimera states were mo stly believed to exist for nonlocal coupling. Our findings provide theoreti cal evidence that nearest neighbor interactions are indeed capable of suppo rting such states in a wide parameter range. SQUID metamaterials are the su bject of intense experimental investigations and we are highly confident th at the complex dynamics demonstrated in this manuscript can be confirmed in the laboratory.\n\nHOST: Steve Anlage LAST-MODIFIED:20161014T142154Z LOCATION:IREAP Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL SEMINAR: IREAP: Dr. Johanne Chitzanidis\, National Center f or Scientific Research "Demokritos" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170127T171500Z DTEND:20170127T181500Z DTSTAMP:20260828T094430Z UID:jpi5rqio618mn0kocrq1o3buic@google.com CLASS:PUBLIC CREATED:20170118T154330Z DESCRIPTION:Speaker Name: Dong-Ling Deng \n\nSpeaker Institution: CMTC and JQI \n\nTitle: Exact Machine Learning Topological States\n\n(lunch served at 12:00pm)\n\nAbstract: Artificial neural networks play a prominent role in the rapidly growing field of machine learning and are recently introduce d to quantum many-body systems to tackle complex problems. In this talk\, I will show that even topological states with long-range quantum entanglemen t can be represented with classical artificial neural networks with short- range connections. This is demonstrated by using three concrete spin system s\, namely the one-dimensional (1D) symmetry-protected topological cluster states\, the 2D and 3D toric code states with intrinsic topological orders . For all three cases\, I will show rigorously that the topological ground states can be represented by short-range neural networks in an exact and ef ficient fashion (efficient in the sense that the number of parameters scal es only linearly with the system size) . In addition\, for the toric-code m odels the proposed short-range neural networks can also describe precisely the excited states with abelain anyons and their nontrivial mutual statisti cs. \n\nBased on the paper: arXiv:1609.09060. LAST-MODIFIED:20170124T165340Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170209T173000Z DTEND:20170209T183000Z DTSTAMP:20260828T094430Z UID:8smhgt204etfk1bhoqd98c78o8@google.com CREATED:20170127T151043Z DESCRIPTION:Speaker Name: David Levermore\n\nSpeaker Institution : Departme nt of Mathematics - University of Maryland\n\nTitle : Integrability of Matr ix Riccati Equations that Arise in Hydrodynamics\n LAST-MODIFIED:20170127T152600Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180817T193000Z DTEND:20180817T210000Z DTSTAMP:20260828T094430Z UID:7d25l29jm10il995t6b7od15bp@google.com CREATED:20180809T184713Z DESCRIPTION:Speaker: Martin Lichtman\, JQI\n\nTitle: Building Large (in num ber and space) Quantum Systems Using Remote Entanglement\n\nAbstract: Maint aining coherence in a quantum system is easier when they are simple and wel l isolated from the environment\, which typically means starting small in b oth number of particles and the physical size of the system. Linking togeth er these systems is one path toward "scaling up" quantum computing\, and di stributing the modules is necessary for a quantum network. Furthermore\, di stributing quantum systems gives access to spatial variation which may be o f great interest to measure with a sensor network. We will discuss why remo te entanglement is a necessary ingredient for such systems\, various approa ches to generating remote entanglement\, and how these experiments reveal t he "spooky" fundamental physics of our world.\n\nNotes: Food and beverages served after the talk. LAST-MODIFIED:20180809T184713Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI summer school TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170426T200000Z DTEND:20170426T213000Z DTSTAMP:20260828T094430Z UID:46buokqc91os3j89nbo0n3u304@google.com CREATED:20170425T130631Z DESCRIPTION:Speaker Name: David Nygren\n\nSpeaker Institution : University of Texas\n\nTitle : "The Matter - Anti-matter Asymmetry of the Universe: Wh y is there Something Rather than Nothing?"\n\nAbstract : Our universe is fi lled with matter\, but antimatter is an ephemera\, seen only naturally in t he debris of high-energy processes and cosmic rays. Yet the standard model of particle physics and cosmic implies that only about 1 proton or anti-pro ton in about 1020 should have escaped annihilation into photons or neutrino s. The measured ratio\, however\, of baryons–protons and neutrons–to the ph otons left over is about 6 x 10-10\, ten orders of magnitude greater! At so me very early moment\, something broke that initial symmetry\, yielding ult imately the universe we inhabit and explore today. The attractive theory of leptogenesis\, with massive neutrinos that distinguish between matter and antimatter\, predicts this ratio and imposes a Majorana nature on today’s n eutrinos–neither matter nor antimatter. The only practical avenue for disco vering a Majorana nature is the search for an almost unimaginably rare nucl ear decay–neutrinoless double beta decay–possible in a few isotopes. If we convincingly observe this decay mode\, we learn that that lepton number is not conserved and that the neutrino and anti-neutrino are identical. I focu s on NEXT\, a search based on high-pressure xenon gas that attempts to real ize excellent energy resolution and high rejection of backgrounds through e vent topology. Strangely\, a biochemistry technique might help us succeed. Perhaps an exciting discovery awaits\, one that may indicate how the univer se chose to keep about one part per billion of matter. LAST-MODIFIED:20170425T131459Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171120T200000Z DTEND:20171120T213000Z DTSTAMP:20260828T094430Z UID:3qtvka2oodqnq75htnvpnme1hq@google.com CREATED:20171106T143311Z DESCRIPTION:Speaker: Siddharth Mishra-Sharma\n\nSpeaker Institution: Prince ton University\n\nTitle: Searching for Dark Matter Annihilation in Nearby G alaxy Groups \n \nAbstract: Galaxies and galaxy clusters outside the Milky Way are expected to be some of the brightest sources of dark matter (DM) an nihilation in the sky. Further\, galaxy catalogs such as the 2MASS survey t ell us where thousands of these objects are located. The challenge\, howeve r\, is that catalogs only detail the baryonic properties of individual gala xies rather than the halo properties of galaxy groups which are expected to correlate with the dark matter distribution. I will describe how to go fro m a catalog of galaxies to a map of the extragalactic dark matter distribut ion in the sky\, taking into account systematic uncertainties in our knowle dge of the galaxy-halo connection. I will then apply this method to several galaxy catalogs of the local Universe\, constructing a nearly all-sky map of an expected DM annihilation signal. Finally\, I will show the results of searching for this structure in Fermi gamma-ray data\, producing sensitivi ty to DM annihilation comparable to that obtained using dwarf galaxies\, an d comment on implications for the DM interpretation of the Galactic Center excess. LAST-MODIFIED:20171106T143311Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160420T170000Z DTEND:20160420T183000Z DTSTAMP:20260828T094430Z UID:f6jrl863qbi6c1e3ua3umgh5vc@google.com CREATED:20160406T142246Z DESCRIPTION:\nSpeaker: Jiunn-Wei Chen\n\nSpeaker Institution: National Taiw an University\n\nTitle: Can Entanglement Entropy Be a Finite Quantity?\n\nA bstract: I will introduce the basic idea of entanglement entropy and how it can\nbe computed on field theoretical systems such as the phi^4 theory and \nQCD. I will further show that by putting counterterms allowed by\nsymmetr ies of the theory in the interface between two entangled\nregions\, the ent anglement entropy becomes finite. This aspect of\nrenormalizability was not realized in the past. LAST-MODIFIED:20160412T182928Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171107T160000 DTEND;TZID=America/New_York:20171107T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171107T160000 CREATED:20170809T180226Z DESCRIPTION:Speaker: David Griffiths\, Reed College\nHosted by Howard Milch berg\n\nTitle: Hidden Momentum\n\nAbstract: Electromagnetic fields carry en ergy\, momentum\, and even angular momentum. The momentum density is εo(E×B )\, and it accounts (among other things) for the pressure of light. But eve n static fields can harbor momentum\, and this would appear to contradict a general theorem: if the center of energy of a closed system is at rest\, t hen its total momentum must be zero. Evidently in such cases there lurks so me other momentum\, not electromagnetic in nature\, equal and opposite to t he field momentum. But finding this “hidden momentum” can be surprisingly s ubtle. I’ll discuss a particularly nice example. \n\n\n LAST-MODIFIED:20170817T145652Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180205T160000Z DTEND:20180205T170000Z DTSTAMP:20260828T094430Z UID:5vb2laj5o6tuqhvndvplg6dnku@google.com CLASS:PUBLIC CREATED:20171114T121814Z DESCRIPTION:Speaker: Philip Kim\, Harvard\n\nTitle: Electronic and Optoelec tronic Physics in the van der Waals Heterojunctions\n\nAbstract: Recent adv ances of van der Waals (vdW) materials and their heterostructures provide a new opportunity to realize atomically sharp interfaces in the ultimate qua ntum limit. We demonstrate the enhanced electronic optoelectronic performan ces in the vdW heterostructures\, suggesting that these a few atom thick in terfaces may provide a fundamental platform to realize novel physical pheno mena\, such as cross-Andreev reflection across the quantum Hall edges state s\, and interlayer exciton formation and manipulations. LAST-MODIFIED:20171114T121814Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180313T171500Z DTEND:20180313T181500Z DTSTAMP:20260828T094430Z UID:0c3vutr88oiiusvj5eqs73t0ku@google.com CREATED:20180306T151617Z DESCRIPTION:Speaker: Professor Michael Hinczewski\, Case Western Res erve University


Title: Professor Michael Hinczewsk i\, Case Western Reserve University


Abstract: \;Biological cells have an elaborate machinery for probing their  \;external environment. \; They gather information about t he many small \;molecules diffusing around them\, whether nutrients\, or hormones\, or \;toxic agents. \; This i nformation is conveyed from receptors on the \;surface of the cell to the interior by a multitude of protein enzymes\, \;< span>catalyzing reactions that add or remove chemical tags from other \ ;proteins. \; These tags are the basic units of biological signaling\, \;analogous to the zeros and ones in which a digital message is encoded \;in engineered communication s ystems. \; But biological circuits are \;extremely err or-prone\, distorting the signal through the stochastic \; nature of protein interactions under constant thermal agitation. \; So& nbsp\;the cell expends enormous amounts of energy on error-cor rection \;mechanisms\, maintaining the fidelity of the sig nal. \; \;My talk explores a general class of biochemi cal signaling networks (push-pull kinase-phosphatase loops) across the enti re biological parameter space\, taking advantage of the massive growth in b ioinformatic databases. \; We find an \;intricate three-way c ost-benefit relationship between signaling fidelity\, speed and energetic r esources\, along with an analytical criterion for optimality that can be di rectly applied to experimental data. LAST-MODIFIED:20180307T150416Z LOCATION:IPST Bldg. 085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161114T213000Z DTEND:20161114T223000Z DTSTAMP:20260828T094430Z UID:067691ED-57E1-40CE-B01C-BC39B3DAC7D4 CREATED:20161028T011425Z DESCRIPTION:Title : The development of turbulence during magnetic reconnect ion at the Earth's magnetopause\nSpeaker Name: Marc Swisdak\nSpeaker Instit ution : University of Maryland LAST-MODIFIED:20161111T205800Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160513T161500Z DTEND:20160513T171500Z DTSTAMP:20260828T094430Z UID:7423j4sqvhqfh547a9igl6mpvc@google.com CREATED:20160505T202414Z DESCRIPTION:Speaker Name: Guanyu Zhu\n\nSpeaker Affiliation: JQI\n\nTitle: Measuring entanglement spectrum in quantum many-body systems\n\nAbstract: A s first pointed out by Haldane and Li in the context of fractional quantum Hall effect\, the full spectrum of the reduced density matrix of a subsyste m\, referred to as entanglement spectrum (ES)\, can serve as fingerprint o f topological order (TO)\, which is itself a non-local feature and a patter n of long-range entanglement. The correspondence between ES and TO has been further explored since then and the importance of ES has been extended to the context of quantum criticality\, symmetry-breaking phases\, and most re cently many-body localization. The ever increasing theoretical interests i n ES hence urgently demands a feasible measurement protocol.\n\nIn this tal k\, we present a measurement protocol to access the entanglement spectrum o f many-body states in experiments with cold atoms and cavity-QED. The meas urement scheme is based on the ability to produce several copies of the sta te under investigation together with the possibility to perform a global sw ap gate between two copies conditional on the state of an auxiliary qubit o r cavity photon mode. We show that this protocol can be implemented with st ate-of-the-art techniques in cold atom and circuit-QED experiments. In part icular we show how the required conditional swap gate can be implemented wi th cold atoms using Rydberg interactions and with superconducting qubits us ing Jaynes-Cummings interactions. We illustrate this ideas on a simple (ext ended) Hubbard model where such a measurement protocol would reveal topolog ical features of the Haldane phase. Our protocol can also be extended to other experimental systems\, such as trapped ions.\n\nThis talk is based o n collaboration with Hannes Pichler\, Alireza Seif\, Eliot Kapit\, Peter Zo ller\, and Mohammad Hafezi\n LAST-MODIFIED:20160511T194949Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160427T190000Z DTEND:20160427T200000Z DTSTAMP:20260828T094430Z UID:lp093ajp2cj18hogtbkmq8qh7c@google.com CREATED:20160421T125655Z DESCRIPTION:Speaker Name: Dr. Yun-Pil Shim\n\nSpeaker Institution : Laborat ory for Physical Sciences\n\nTitle : New designs for superconducting and se miconductor qubits by learning from each other\n\nAbstract : Localized elec tron spins in semiconductors and superconducting quantum circuits provide t wo of the most promising architectures for solid state quantum computing. W hile differences in material properties and qubit designs lead to quite dif ferent approaches for implementing qubits and necessary quantum operations in each system\, it has proven useful to learn some ideas from different sy stems. In this talk I will discuss two examples of how one can benefit from adopting some ideas from different qubit architectures. In the first part\ , I will present an architecture for superconducting quantum computing base d on selective design principles deduced from spin-based systems\, an encod ed qubit approach realizable with state-of-the-art tunable Josephson juncti on qubits [1]. This scheme enables microwave-free control\, and offers a pa thway to future qubit designs with new capabilities such as with higher fid elity or\, perhaps\, operation at higher temperature. In the second part\, I will discuss how we can improve the quantum dot spin exchange-only qubits by utilizing the "sweet spot"\, which was developed in superconducting cha rge qubit devices to mitigate the charge noise and proved to be very useful in various superconducting and semiconductor qubits. This always-on\, exch ange-only (AEON) qubit is made up of three localized semiconductor spins th at offers a true sweet spot to fluctuations of the quantum dot energy level s [2]. Our qubit system allows for all single- and two-qubit gate operation s to be done at sweet spots using only DC-pulses to tune the couplings betw een the dots\, while only taking one pulse for an encoded two-qubit entangl ing operation.\n[1] Yun-Pil Shim and Charles Tahan\, Nat. Commun. 7\, 11059 (2016).\n[2] Yun-Pil Shim and Charles Tahan\, Phys. Rev. B 93\, 121410(R) (2016).\n\n LAST-MODIFIED:20160421T130446Z LOCATION:LPS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160907T150000Z DTEND:20160907T160000Z DTSTAMP:20260828T094430Z UID:b5qcc7o8it7nrch8a2jlfpr0g0@google.com CREATED:20160613T204827Z DESCRIPTION:Speaker: Roger Colbeck\n\nSpeaker Affiliation: University of Yo rk\n\nTitle: Quantum circuits for quantum operations\n\nAbstract: Every qua ntum gate can be decomposed into a sequence of single-qubit gates and contr olled-NOTs. In many implementations\, single-qubit gates are relatively 'ch eap' to perform compared to C-NOTs (for instance\, being less susceptible t o noise)\, and hence it is desirable to minimize the number of C-NOT gates required to implement a circuit.\n\nI will consider the task of constructin g a generic isometry from m qubits to n qubits\, while trying to minimize t he number of C-NOT gates required. I will show a lower bound and then give an explicit gate decomposition that gets within a factor of about two of t his bound. \nThrough Stinespring's theorem this points to a C-NOT-efficient way to perform an arbitrary quantum operation. I will then discuss the ca se of quantum operations in more detail.\n\n LAST-MODIFIED:20160902T183507Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180216T160000Z DTEND:20180216T170000Z DTSTAMP:20260828T094430Z UID:23f72pkeh2j7gq59273eqbvnvm@google.com CREATED:20180212T183746Z DESCRIPTION:Speaker Name: Alan Jamison\n\nSpeaker Institution: MIT\n\nTit le: Ultracold Molecules for Quantum Simulation\n\nAbstract: Ultracold ato ms have become an exciting platform for studying quantum many-body physics. The much greater complexity of molecules brings new challenges in reaching ultralow temperatures but also exciting new opportunities for studying sys tems with long-range interactions. I will describe how we produce stable ga ses of molecules at microkelvin temperatures. This story will include how w e use ultracold atoms to map out previously unobservable molecular potentia ls. Finally\, I will describe the prospects for quantum state-controlled ch emistry and the simulation of spin Hamiltonians relevant to quantum magneti sm using our unique\, long-lived triplet-state molecules. LAST-MODIFIED:20180212T211307Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:AMO Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180413T200000Z DTEND:20180413T204000Z DTSTAMP:20260828T094430Z UID:2un31b1nm2jjk3k75pc3kar54d@google.com CREATED:20180221T141722Z DESCRIPTION:Speaker Name: Yuan Su\n\nSpeaker Institution: Department of Com puter Science\, UMIACS\, and QuICS\n\nTitle: Toward the first quantum simul ation with quantum speedup\n\nAbstract: With quantum computers of significa nt size now on the horizon\, we should understand how to best exploit their initially limited abilities. To this end\, we aim to identify a practical problem that is beyond the reach of current classical computers\, but that requires the fewest resources for a quantum computer. We consider quantum s imulation of spin systems\, which could be applied to understand condensed matter phenomena. We synthesize explicit circuits for three leading quantum simulation algorithms\, employing diverse techniques to tighten error boun ds and optimize circuit implementations. Quantum signal processing appears to be preferred among algorithms with rigorous performance guarantees\, whe reas higher-order product formulas prevail if empirical error estimates suf fice. Our circuits are orders of magnitude smaller than those for the simpl est classically-infeasible instances of factoring and quantum chemistry\, b ringing practical quantum computation closer to reality.\n\nBased on joint work with Andrew M. Childs\, Dmitri Maslov\, Yunseong Nam and Neil J. Ross (arXiv:1711.10980).\n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 p m. (Talk rescheduled from March 2). LAST-MODIFIED:20180410T182716Z LOCATION:PSC 2136 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170223T203000Z DTEND:20170223T213000Z DTSTAMP:20260828T094430Z UID:urg8oufdioq91avtuptij9s4ak@google.com CREATED:20170220T142340Z DESCRIPTION:Speaker: David Pincus (UMd) \nAbstract: We will start on chapte r 3 of the book "Dirichlet Branes and Mirror Symmetry"\, http://bookstore.a ms.org/cmim-4 . You can get the whole book in electronic form from http:// claymath.org/publications/online-books . LAST-MODIFIED:20170220T142340Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Supersymmetric quantum mechanics (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171111T150000Z DTEND:20171111T170000Z DTSTAMP:20260828T094430Z UID:2atq3rdatcj43vh5o6fc48cjkd@google.com CREATED:20170927T150030Z DESCRIPTION:Exploring the Extraordinary With Physics\nUMD Physics and the M aryland STEM Festival present Exploring the Extraordinary with Physics\, a program for children and families. More details to come at https://umdphysi cs.umd.edu/outreach LAST-MODIFIED:20170927T150030Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Discovery Days TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170214T181500Z DTEND:20170214T191500Z DTSTAMP:20260828T094430Z UID:lohheev9gbi483luiae6ltgu9g@google.com CREATED:20170206T153352Z DESCRIPTION:Speaker Name: Professor Chris Jarzynski\n\nSpeaker Institution: UMCP\n\nTitle: "Connecting Thermodynamics to Statistical Mechanics in the Strong-coupling Regime"\n\nAbstract: Stochastic thermodynamics describes ho w the first and second laws of thermodynamics "scale down" to apply to micr oscopic systems of interest. In this field\, and in textbook discussions\, it is customary to use the canonical ensemble to represent an equilibrium s tate of a system that is in contact with a thermal reservoir. Familiar macr oscopic relations between internal energy\, entropy\, free energy\, heat an d work are easily derived from the canonical distribution. It is known\, ho wever\, that the canonical ensemble does not accurately describe a nanoscal e system that is strongly coupled to its surroundings\, such as a biomolecu le in aqueous solution. Thus the usual connection between thermodynamics an d statistical mechanics cannot easily be invoked in this situation. \n\n I will discuss a modified thermodynamic framework that describes a classical system of interest of arbitrary size that is strongly coupled to its therma l environment. Seven key thermodynamic quantities - internal energy\, entro py\, volume\, enthalpy\, Gibbs free energy\, heat\, and work - are defined microscopically within this framework. These quantities obey thermodynamic relations including both the first and second law\, and they satisfy nonequ ilibrium fluctuation theorems. Additionally\, these key quantities scale up to their macroscopic values\, when the system of interest is large. Thus a unifying framework is developed\, which encompasses microscopic\, stochast ic thermodynamics at one end\, and traditional macroscopic thermodynamics a t the other. A central element in this approach is a thermodynamic definiti on of the volume of the system of interest\, which converges to the usual g eometric definition when the system is large. \n\nhttp://jacobi.umd.edu/sta tphys LAST-MODIFIED:20170213T161418Z LOCATION:IPST Building 085\, Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - Canceled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171002T160000 DTEND;TZID=America/New_York:20171002T170000 DTSTAMP:20260828T094430Z UID:7lt08t63akq1aj04pdbnqlaibo@google.com RECURRENCE-ID;TZID=America/New_York:20171002T160000 CREATED:20170906T191250Z DESCRIPTION:Title : Engineering the physical properties of the tumor microe nvironment\nSpeaker Name: Dr. Kandice Tanner\nSpeaker Institution : Nationa l Institute of Health/National Cancer Institute\nNotes: http://www.maryland biophysics.umd.edu/\nAbstract : Transformation of the physical microenviron ment including changes in mechanical stiffness of the extracellular matrix (ECM) may be one of the crucial factors that drives cancer progression. In addition to tissue mechanics\, the surface topography of the ECM microenvir onment has been shown to modulate gene expression. Simply put\, how do chan ges in the physical microenvironment drive cancer progression? 3D culture m odels can approximate in vivo architecture and signaling cues\, allowing fo r real time characterization of cell-ECM dynamics. We developed tissue mime tics that recreate the complex in vivo geometries while independently contr olling bulk stiffness and ECM ligand density. We also developed tools that allow us to resolve and quantitate minute forces that cells sense in the lo cal environment (on the order of microns) within thick tissue (in mm). Usin g these methods\, we are able to dissect the contributions of the physical properties from those due to chemical properties on cell fate as it relates to malignancy and normal tissue homeostasis. Finally\, we validated our in vitro findings in an in vivo model using zebrafish as our model for metast asis.\n\nYour E-Mail: snejjar@umd.edu LAST-MODIFIED:20170925T150636Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180216T161500Z DTEND:20180216T173000Z DTSTAMP:20260828T094430Z UID:32nqgukkhv5dg8tju4i8n7q8l7@google.com CREATED:20180122T234511Z DESCRIPTION:Speaker: John Nichol (Rochester)

Title: Why do spin qubi ts dephase?

Abstract: Isolated spins in semiconductorscan retain the ir quantum phase coherence for times exceeding one second. Suchlong coheren ce times make spin qubits a versatile platform for exploringquantum informa tion processing and condensed matter physics. However\, mostschemes to enta ngle spin qubits involve endowing the spin with an electricdipole moment\, rendering its energy splitting sensitive to charge noise in thesemiconducto r. I will give an overview of charge noise in semiconductor spinqubits\, in cluding what we know and do not know about it\, and I will discuss anew str ategy to entangle spin qubits using large magnetic field gradients tosuppre ss the effects of charge noise. Using this technique\, we demonstrate anent angling gate between spin qubits with a fidelity of 90%.

Host: Rober t Throckmorton

http://www.physics.umd.edu/ cmtc/seminars.html

When: Fri\, Feb. 16 @ 11:15am
Where: CMTC Conference Room (2205 Toll Physics Bldg.) \; \; \; \; LAST-MODIFIED:20180127T024247Z LOCATION:2205 John S Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181022T110000 DTEND;TZID=America/New_York:20181022T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181022T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Neutral atom quantum computing\n\nSpeaker: David Weiss\, Penn State\n\nAbstract: I'll review the progress we have made at Penn Stat e toward quantum computing with arrays of atoms in a 3D optical lattice. Am ong the topics I'll discuss are high fidelity (0.997) single qubit gates\, achieving perfect site filling via Maxwell demon\, and high fidelity (0.999 4) state detection. LAST-MODIFIED:20180914T131645Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160425T200000Z DTEND:20160425T210000Z DTSTAMP:20260828T094430Z UID:9a96rglumai542aut8am6uigag@google.com CREATED:20160418T132937Z DESCRIPTION:Speaker Name: A.R. Ferré-D'Amaré\n\nSpeaker Institution : NIH\n \nTitle : Crystal Structure of an RNA Mimic of GFP Reveals A G-quadruplex C ore\n\nAbstract : Green fluorescent protein (GFP) and its derivatives revol utionized the study of proteins. 'Spinach' is a recently reported in vitro evolved RNA mimic of GFP\, which as genetically encoded fusions\, makes pos sible live-cell\, real-time imaging of biological RNAs\, without resorting to large RNA-binding protein-GFP fusions (1). To elucidate the molecular ba sis of Spinach fluorescence\, we have solved its co-crystal structure bound to its cognate exogenous chromophore\, revealing that Spinach activates th e small molecule by immobilizing it between a base triple\, a G-quadruplex\ , and an unpaired guanine. Mutational and NMR analyses indicate that the G- quadruplex is essential for Spinach fluorescence\, is also present in other fluorogenic RNAs\, and may represent a general strategy for RNAs to induce fluorescence of chromophores. The structure has guided the design of a min iaturized 'Baby Spinach'\, and provides the foundation for structure-driven design and tuning of fluorescent RNAs (2). \n\nThis work was supported in part by the Intramural Program of the National Heart\, Lung and Blood Insti tute\, NIH.\n\n(1) Paige\, J.S.\, Wu\, K.Y.\, & Jaffrey\, S.R. Science 333\ , 643-646 (2011).\n(2) Warner\, K.D.\, Chen\, M.C.\, Song\, W.\, Strack\, R .L.\, Thorn\, A.\, Jaffrey\, S.R.\, & Ferré-D'Amaré\, A.R. Nature Struct. M ol. Biol. 21\, 658-663 (2014).\n LAST-MODIFIED:20160418T133128Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161011T171500Z DTEND:20161011T181500Z DTSTAMP:20260828T094430Z UID:ojnj478r88g3n1hp6ekpbbv07k@google.com CREATED:20161004T150014Z DESCRIPTION:Speaker Name: Professor Jayanta Bhattacharjee\n\nSpeaker Instit ution : Harish-Chandra Research Institute\n\nTitle: The Two-Dimensional Hyd raulic Jump\n\nAbstract : A vertical jet of liquid jet impinging on a solid horizontal surface spreads out radially. For a sufficiently fast flowing f luid\, a sudden increase in the height occurs at some specific distance fro m the point of impact along a circular locus and is called a hydraulic jump . It has been known and investigated for more than hundred years. The inter esting point is that the jump corresponds to the formation of a horizon. Ov er the last few years it has been seen that under appropriate conditions th e jump can be polygonal and within the last year some of the polygonal jump s have been seen to rotate. We will discuss certain features of the interpl ay between the horizon formation and the effect of viscosity which can lead to an understanding of some of the features. LAST-MODIFIED:20161004T150143Z LOCATION:IPST 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161031T203000Z DTEND:20161031T213000Z DTSTAMP:20260828T094430Z UID:30D28B52-0F91-482E-A079-53421F9D7544 CREATED:20161028T012054Z DESCRIPTION:Speaker Name: Jan V. Sengers\n\nSpeaker Institution : UMD Insti tute for Physical Science and Technology\n\nTitle : Fluctuations in liquids on earth and in space\n \nAbstract : Liquids in non-equilibrium steady sta tes exhibit giant thermal fluctuations that are affected by gravity. This d iscovery has led to a variety of experimental studies of these fluctuations both on earth and in space missions that will be reviewed. Most recently\, it has been predicted that these fluctuations will also cause a new type o f fluctuation-induced Casimir force in non-equilibrium liquids.\n LAST-MODIFIED:20161028T013453Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180507T110000 DTEND;TZID=America/New_York:20180507T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180507T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: \;Subir Sachdev

Affiliation: H arvard

Title: \;Building strange metals from SYK models

Abstract: \;The solvable SYK models describe interact ing electrons in a `quantum dot’ without quasiparticle excitations. \;< /span>They exhibit rapid scrambling of quantum information\, and thermalize in the fastest possible time of order (Plank’s constant)/(Absolute tempera ture). The strange metal state is found in materials exhibiting high temper ature superconductivity: heat and electricity are transported in this metal not by individual particles\, but by collective quantum excitations.
I will describe the basic properties of the SYK models\, and show how the y can be used as building blocks for a theory of the strange metal. LAST-MODIFIED:20180501T204234Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170221T181500Z DTEND:20170221T191500Z DTSTAMP:20260828T094430Z UID:0mh4hj8kklcheov49ihpr19iqc@google.com CREATED:20170124T145048Z DESCRIPTION:Speaker Name: Dr. John Biddle\n\nSpeaker Institution: Harvard U niversity\n\nTitle: Asymmetry in Assisted Loading: A Signature of Energy Ex penditure?\n\nAbstract: Nearly all of the quantitative models used to study gene regulation rely on the assumption\, derived from the study of bacteri a\, that such regulation takes place at thermodynamic equilibrium. However\ , it is known that eukaryotes expend energy during gene regulation\, and se veral recent experimental findings and theoretical investigations have high lighted the inadequacy of the equilibrium assumption. One case of current i nterest is that of asymmetry in assisted loading\, as seen for example at t he glucocorticoid response element (GRE). Two transcription factors\, the g lucocorticoid receptor (GR) and a modified version of the estrogen receptor (ER-pBox)\, both bind to the GRE. But while the presence of GR greatly enh ances the binding of ER-pBox\, the presence of ER-pBox has no measurable ef fect on the binding of GR. To study these observations\, I introduce a gene -regulatory model based on the Monod-Wyman-Changeux (MWC) model of alloster y in proteins\, extended to allow for multiple transcription factors. This model does allow asymmetries in assisted loading at equilibrium\, but the c ondition of thermodynamic equilibrium constrains the relationship between t he possible asymmetry and the steady-state binding of each factor in isolat ion. In the case of asymmetric assisted loading at the GRE\, the data are i nconsistent with these constraints\, which supports the hypothesis that reg ulation at the GRE involves the expenditure of energy. \n\nhttp://jacobi.um d.edu/statphys\n LAST-MODIFIED:20170209T200814Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180910T203000Z DTEND:20180910T213000Z DTSTAMP:20260828T094430Z UID:4p2rtqekch0rn72q7qhn637pfj@google.com CREATED:20180824T203245Z DESCRIPTION:Title: Mapping Disturbances within the Ionosphere and Plasmasph ere with Low-frequency Radio Interferometry

Speaker Name: Joseph Hel mboldt\, \;Remote Sensing Division\, Naval Research Laboratory

A bstract: Within this seminar\, I will discuss efforts to develop new method s to exploit the unique ionospheric remote sensing capabilities of low-freq uency radio interferometers. This work relies heavily on data obtained with the low-band system of the Very Large Array (VLA) telescope in New Mexico\ , especially via the Naval Research Laboratory's VLA Low-band Ionosphere an d Transient Experiment (VLITE)\, which runs continuously on 16 of the 27 VL A antennas. I will describe procedures for extracting the TEC gradient from VLA/VLITE data and methods for analyzing these data to characterize waveli ke disturbances that pass through the VLA lines of sight. I will also discu ss new techniques for producing tomographic reconstructions of plasmaspheri c disturbances from routine VLA/VLITE observations. I will also detail simi lar tomographic methods for imaging km-scale ionospheric disturbances when the telescopes slew much faster than the sidereal rate in the newly impleme nted "on-the-fly" mode. Finally\, I will discuss the types of phenomena obs erved and characterized with these methods and what they tell us about coup ling between the lower atmosphere and ionosphere\, the ionosphere and plasm asphere\, and the Earth and its space environment \;<\;full abs tract>\;

Notes: Coffee\, Tea and Snacks 4:15-4:30 PM LAST-MODIFIED:20180905T193557Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171004T150000Z DTEND:20171004T160000Z DTSTAMP:20260828T094430Z UID:4475phmldtvmkmkj23ra0em3t7@google.com CREATED:20170928T183345Z DESCRIPTION:Speaker: Professor Rigoberto Hernandez\, Dept of Chemistry​\, J ohns Hopkins University​\n\nTitle: Exact Classical Transition ​S​tate​ ​​T​ heory in Dissipative and Driven Chemical Dynamic​s\n\nAbstract: The rates o f chemical reactions (or any activated process) are by definition determine d by the flux of reactants (or initial states) that end up as products (or final states). Through the last hundred years of studies on reaction rate t heory\, it has become clear that this can be equated to the flux through an y surface that divides reactants from products as long as only those trajec tories that end up as products are included in the flux. Transition state t heory (TST) ignores this last clause. It thereby overestimates the rate if any of the trajectories recross the dividing surface. However\, its advanta ge is that it replaces a dynamical calculation with a geometric one. Throug h the variational principle or perturbation theory\, however\, one can cons truct non-recrossing dividing surfaces that lead to exact rates. These appr oaches are limited by the nature of the search space of surfaces and the re ference dividing surface\, respectively. We have recently discovered that t he Lagrangian descriptor can be used to resolve the dividing surface direct ly. [G. T. Craven and R. Hernandez\, Phys. Rev. Lett. 115\, 148301 (2015)] We will further show the accuracy of the method for barrierless reactions\, model reactions\, ketene isomerization and LiCN isomerization. [A. Junging er and R. Hernandez\, J. Phys. Chem. B\, 120\, 1720 (2016)] LAST-MODIFIED:20170928T183345Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180301T123000 DTEND;TZID=America/New_York:20180301T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180301T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Victor Yakovenko\nUniversity of Maryland Department of Physics\nTitle: Economic inequality from a statistical physics point of vi ew\nAbstract: Inequality is an important and seemingly inevitable aspect of the human society. Various manifestations of inequality can be derived fr om the concept of entropy in statistical physics. In a stylized model of m onetary economy\, with a constrained money supply implicitly reflecting con strained resources\, the probability distribution of money among the agents converges to the exponential Boltzmann-Gibbs law due to entropy maximizati on. Our empirical data analysis [1] shows that income distributions in the USA\, European Union\, and other countries exhibit a well-defined two-clas s structure. The majority of the population (about 97%) belongs to the low er class characterized by the exponential ("thermal") distribution. The up per class (about 3% of the population) is characterized by the Pareto power -law ("superthermal") distribution\, and its share of the total income expa nds and contracts dramatically during booms and busts in financial markets. Interestingly\, the same equations can be also applied to heavy-ion colli sions [2]. Globally\, energy consumption (and CO2 emissions) per capita ar ound the world shows decreasing inequality in the last 30 years and converg ence toward the exponential probability distribution\, as expected from the maximal entropy principle. In agreement with our prediction [3]\, a satur ation of the global Gini coefficient for energy consumption at 0.5 is obser ved for the most recent years. All papers are available at http://physics. umd.edu/~yakovenk/econophysics/.\n[1] Yong Tao et al.\, "Exponential struct ure of income inequality: evidence from 67 countries"\, Journal of Economic Interaction and Coordination (2017) http://doi.org/10.1007/s11403-017-0211 -6 http://arxiv.org/abs/1612.01624\n[2] Xuejiao Yin et al.\, "A new two-com ponent model for hadron production in heavy-ion collisions"\, Advances in H igh Energy Physics (2017) 6708581\, http://doi.org/10.1155/2017/6708581\n[3 ] S. Lawrence\, Q. Liu\, and V. M. Yakovenko\, "Global inequality in energy consumption from 1980 to 2010"\, Entropy 15\, 5565 (2013)\, http://dx.doi. org/10.3390/e15125565 LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180911T171500Z DTEND:20180911T181500Z DTSTAMP:20260828T094430Z UID:50qiomkego2iui0d3o4s6t8apj@google.com CREATED:20180904T140157Z LAST-MODIFIED:20180904T140157Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170331T161500Z DTEND:20170331T171500Z DTSTAMP:20260828T094430Z UID:tu6umrar11vaio1aeo6o67hq1o@google.com CLASS:PUBLIC CREATED:20170327T123259Z DESCRIPTION:Title: Long-Range Interactions Accelerate Fast State Transfer a nd Entanglement Renormalization\n\nSpeaker Name: Zachary Eldredge \n\nSpeak er Institution: JQI/QuICS\n\nAbstract: \nHow fast can entanglement be sprea d between two distant points? It depends on the strength and range of the i nteraction. For short-range systems\, the time to generate an entangled sta te between two points will be linear in the distance between them. For long -range interacting systems\, we can usually do better\, but how much better is an open question. In this talk\, I will present a protocol that achieve s an exponential speed-up in the rate of entanglement generation and discus s how this can be applied to a circuit described by a MERA (multiscale enta nglement renormalization ansatz). I will also explain how this protocol mig ht be realized in a real system.\n\nAuthors: Zachary Eldredge\, Zhe-Xuan Go ng\, Jeremy T. Young\, Ali Hamed Moosavian\, Michael Foss-Feig\, Alexey V. Gorshkov LAST-MODIFIED:20170327T123259Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170425T171500Z DTEND:20170425T181500Z DTSTAMP:20260828T094430Z UID:oh18s5408kmjcfgd5r2heupnpg@google.com CREATED:20170327T174739Z DESCRIPTION:Speaker Name: Dr. Vivek Prabhu\n\nSpeaker Institute: NIST\n\nTi tle: Self-assembly and dynamics of oligocarbonate-functionalized telechelic polymers\n\nAbstract: Hierarchical\, self-assembled telechelic (triblock) copolymers of poly(ethylene glycol) (PEG) in aqueous solutions provide adva nced materials for biomaterial applications due to their ability to form dr ug-loaded micelles and injectable gels. Recent advancements in the synthes is of aliphatic polycarbonates-block-PEG show nontraditional micellar and h ierarchical structures driven by the supramolecular assembly of the carbona te block functionality that includes cholesterol\, vitamin D\, or fluorene. The equilibrium between micelles and clustering of micelles and the prope rties of the clusters are of current fundamental interest. Further\, char acterization of the equilibrium on the temperature-composition phase diagra m in terms of an uncooperative or cooperative self-assembly may open how ch ain conformation and self-assembly are coupled. This presentation shall d escribe the assembly structure and dynamics observed experimentally by stat ic and dynamic light scattering and small-angle neutron scattering. \n\n LAST-MODIFIED:20170419T154737Z LOCATION:IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171020T110000 DTEND;TZID=America/New_York:20171020T115000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com RECURRENCE-ID;TZID=America/New_York:20171013T110000 CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nFourth lecture: Theory of Neural Networks (history\, motives\, limit ations\, algorithms\, transforms)\n\nCourse description: This short course covers the fundamentals of machine learning\, assuming the typical backgrou nd and motives of a physicist. It's goal is to give those who attend an und erstanding of the field and its capabilities\, as well the tools to learn t he necessary extensions of the topic to apply it to their physics research. Lectures will include introductions to Python\, Linux\, neural nets\, deep learning\, natural language processing\, imagine recognition/computer visi on\, and AI safety.\n\nRSVP for the first friday here: http://bit.ly/2xgpvD E\njustinkterry@gmail.com LAST-MODIFIED:20171020T152021Z LOCATION:Edward St. John 2208 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180917T190000Z DTEND:20180917T203000Z DTSTAMP:20260828T094430Z UID:7vb5fo1cp913q8s62ochirkjqe@google.com CREATED:20180914T130315Z DESCRIPTION:Title: Dark Matter in Light of the 21cm EDGES Signal\n\nSpeaker : Ely Kovetz\, Johns Hopkins\n\nAbstract: Cosmology with the 21cm signal\, in particular from the epoch surrounding the birth of the first stars\, kno wn as cosmic dawn\, holds tremendous promise for the search for dark matter . \nRecently\, the EDGES collaboration claimed a detection of an absorption profile of CMB photons in neutral hydrogen at frequencies corresponding to cosmic dawn redshifts.\nThe measured amplitude of the absorption trough is several standard deviations stronger than allowed by the concordance cosmo logical model\, indicating that either the background radiation temperature was much higher than expected\, or that the gas temperature at the cosmic dawn epoch was much lower than expected. The latter had been predicted as a possible signature of coulomb-type interactions between dark matter and ba ryons. I will describe the EDGES measurement and its suggested explanation via millicharged dark matter\, placing emphasis on the strong constraints t o this model. \nLastly\, I will independently show how a detection of 21cm absorption at cosmic dawn can be used to place the strongest constraints to date on models of ultra-light hidden photon dark matter across more than t en orders of magnitude in mass. LAST-MODIFIED:20180914T130315Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161102T190000Z DTEND:20161102T200000Z DTSTAMP:20260828T094430Z UID:go8jit02reh17gqqkt0n9cg75g@google.com CREATED:20161020T145529Z DESCRIPTION:Speaker Name: Dr. Dev Palmer\n\nSpeaker Institution : Microsyst ems Technology Office of the Defense Advanced Research Projects Agency (DAR PA/MTO)\n\nAbstract : The Microsystems Technology Office of the Defense Adv anced Research Projects Agency (DARPA/MTO) helps to create and prevent stra tegic surprise through pivotal investments in compact\, high-performance mi croelectronic components. These advanced components expand the design space for systems engineers\, which in turn enables breakthrough capabilities fo r military communications and sensing. This presentation will begin by prop osing a figure of merit for communications links based on physics and infor mation theory\, and placing the figure of merit in context with current sys tems. The figure of merit then will be used to frame relevant results from a number of DARPA/MTO programs in the millimeter and sub-millimeter wave ba nds. The talk will conclude with a discussion of the interplay between comm ercial and government investments in millimeter-wave electronics\, and a sh ort list of topic areas for future research.\n\n LAST-MODIFIED:20161020T145618Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160509T150000Z DTEND:20160509T160000Z DTSTAMP:20260828T094430Z UID:89ocsmidqf6l7vg8epmt48hg8g@google.com CLASS:PUBLIC CREATED:20160426T170210Z DESCRIPTION:speaker: Mikhail Lukin \ninstitution: Harvard University\n\nExp loring new frontiers of quantum optical science\n\nWe will discuss recent d evelopments at a new scientific interface between quantum optics\, nanoscie nce and quantum information science. Examples include the use of quantum op tical techniques for manipulation of individual atom-like impurities at a n anoscale and for realization of hybrid systems combining atoms and atom-lik e systems with novel photonic devices. We will discuss how these techniqu es are used for probing non-equilibrium quantum dynamics in disordered many -body systems with long-range interactions\, exploring quantum nonlinear op tics\, scaling up quantum networks and realizing new probes for condensed m atter and biological systems. LAST-MODIFIED:20160506T142000Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170208T160000Z DTEND:20170208T170000Z DTSTAMP:20260828T094430Z UID:kqv51kko7muae4deu6fqitivig@google.com CREATED:20170110T144745Z DESCRIPTION:Speaker: Sergey Bravyi\n\nSpeaker Affiliation: IBM Watson\n\nTi tle: Complexity of quantum impurity models\n\nAbstract: I will discuss clas sical algorithms for computing low-energy states of quantum impurity models . Such models describe a bath of free fermions coupled to a small interact ing subsystem called an impurity. Hamiltonians of this form were famously s tudied by Anderson\, Kondo\, Wilson and others in 1960s. Impurity models al so play the central role in modern material simulation algorithms based on the DMFT method. Quite recently it was suggested that DMFT simulation algor ithms may benefit from quantum computers. As a first step\, one may wish t o use a quantum computer for preparing the ground state of an impurity mode l and extracting some information about its dynamics such as the impurity G reen's function. This motivates the question of whether ground states of im purity models posses any simple structure and under what conditions they ca n be prepared efficiently. Here we show that ground states of impurity mod els can be approximated by low-rank Gaussian states -- superpositions of a small number of fermionic Gaussian states. As a corollary we obtain a class ical algorithm for approximating the ground energy of impurity models. The running time of our algorithm is polynomial in the system size and quasi-po lynomial in the inverse approximation error. \n\nBased on a joint work with David Gosset LAST-MODIFIED:20170110T144844Z LOCATION:3100A Atlantic Building (Computer and Space Science Building) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180427T200000Z DTEND:20180427T204000Z DTSTAMP:20260828T094430Z UID:0pt0ejsitdafoof4lloe132uur@google.com CREATED:20180420T191656Z DESCRIPTION:Speaker Name: Andrew Glaudell\n\nSpeaker Institution: QuICS and JQI\n\nTitle: Quantum Compiling with Qudits\n\nAbstract: Oftentimes\, rese archers are afforded the convenience of thinking about quantum computing op erations in whatever form is most relevant for their work. For theorists\, this is usually as abstract unitary operations\, and for experimentalists\, this is generally as sequences of gates native to their particular experim ental architecture. Quantum compilers serve as the translator between these two representations. Advances in quantum compiling have yielded algorithms that can not only perform this translation task for qubit circuits\, but d o so while providing maximally efficient circuits under some basic assumpti ons of circuit complexity. I will briefly touch on some of these results be fore discussing our recent work on extending efficient quantum compiling al gorithms to the qudit (higher dimensional analogs of qubits) circuit case. In particular\, this work demonstrates a maximally efficient quantum compil er for qutrit (dimension-3 qudits) Clifford + T circuits\, and furthermore may point the way towards a generalized quantum compiling algorithm for all prime dimension qudits. Along the way\, I will tie in the subjects of faul t tolerance and quantum error correction\, in particular focusing on how th ese topics may point to the fact that qudits warrant further consideration for real-world quantum computing architectures.\n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180421T145408Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170327T203000Z DTEND:20170327T213000Z DTSTAMP:20260828T094430Z UID:toq5avf96sbgj38aqfo99pgruc@google.com CREATED:20170313T125727Z DESCRIPTION:Speaker Name: Ke Fang\n\nSpeaker Institution : University of Ma ryland\n\nTitle : Perspectives of finding the sources of high-energy astrop hysical neutrinos\n\nAbstract : The origin of astrophysical neutrinos remai ns a mystery. Growing statistics from the IceCube Observatory at TeV-PeV en ergies starts to reveal important features of the sources\, yet the isotrop ic spacial distribution of the observed events implies that to detect point sources\, both order-of-magnitude more statistics and more advanced search tools are needed. In light of these observational constraints and implicat ions\, we investigate the perspectives of finding the sources of high-energ y neutrinos from both theoretical and experimental aspects. We first discus s the potential source classes of the IceCube neutrinos\, with an emphasis on black hole jets in clusters of galaxies. Then from the analysis point of view we introduce a maximum-likelihood method for search of point-like sou rces utilizing event pairs. We show that when a decent angular resolution i s available\, this method is capable of reducing the statistical errors sig nificantly comparing to the traditional search method using individual even ts. Finally by applying the new method we predict the ability of a future h igh-energy neutrino detector to identify the first neutrino point sources.\ n LAST-MODIFIED:20170313T131632Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180427T150000Z DTEND:20180427T161500Z DTSTAMP:20260828T094430Z UID:2gl7hd2kj520i5jn1sn6ifcphg@google.com CREATED:20180313T163156Z DESCRIPTION:Speaker: Michael Pretko (University of Colorado\, Boulder)
< br>Title: Tensor Gauge Theories of Fractons

Abstract: Fractons are an exotic new class of emergent quasiparticles with severely restricted mob ility\, first encountered in the context of exactly solvable spin models.&n bsp\; In this talk\, I will show how the fracton phenomenon arises as a nat ural feature of tensor gauge theories\, which provide a general framework f or studying most of the known fracton phases. \; In particular\, symmet ric tensor gauge theories exhibit higher moment charge conservation laws\, such as conservation of dipole moment\, which can force the charges to be i mmobile fracton excitations. \; More generally\, these gauge theories a lso feature subdimensional particle excitations which are immobile in certa in directions while remaining free to move in others. \; I will describ e how the tensor gauge theory perspective draws deep connections between fr actons and other areas of physics\, such as elasticity theory and gravity.& nbsp\; Finally\, I will show how the fracton phenomenon can be extended fro m point particles to immobile line-like excitations.

Host: Tom Iadec ola

http://www.physics.umd.edu/cmtc/semina rs.html

 \; LAST-MODIFIED:20180410T123138Z LOCATION:CMTC Conference Room (2205 John S. Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170216T233000Z DTEND:20170217T003000Z DTSTAMP:20260828T094430Z UID:n2upr1rtgn1hlt35r65avlkits@google.com CREATED:20170213T160152Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\nTentative schedule:\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Prof. S teve FetterThe Day After Trinity\nMar 16Prof. James GatesThe Day The Earth Stood Still\nMar 30Dr. Eric DennaThe Imitation Game\nApr 13Prof. Juan Uriag erekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill Dor landChina Syndrome\n\n LAST-MODIFIED:20170216T134710Z LOCATION:PSC Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: Dr. Strangelove TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180312T200000Z DTEND:20180312T213000Z DTSTAMP:20260828T094430Z UID:7oa15a10rb0oerh8dkgn2d78hd@google.com CREATED:20180306T140150Z DESCRIPTION:\nSpeaker: Brian Batell\n\nSpeaker Institution: University of P ittsburgh\n\nTitle: Flavor-specific scalar mediators\n\nAbstract: New singl et scalar bosons have broad phenomenological utility and feature prominentl y in many extensions of the Standard Model. Such scalars are often taken to have Higgs-like couplings to SM fermions in order to evade stringent flavo r bounds\, e.g. by assuming Minimal Flavor Violation (MFV)\, which leads to a rather characteristic phenomenology. Here we describe an alternative app roach\, based on an effective field theory framework for a new scalar that dominantly couples to one specific SM fermion mass eigenstate. A simple fla vor hypothesis\, similar in spirit to MFV\, ensures adequate suppression of new flavor changing neutral currents. We consider radiatively generated fl avor changing neutral currents and scalar potential terms in such theories\ , demonstrating that they are often suppressed by small Yukawa couplings\, and also describe the role of CP symmetry. We further demonstrate that such scalars can have masses that are significantly below the electroweak scale while still being technically natural\, provided they are sufficiently wea kly coupled to ordinary matter. In comparison to MFV\, our framework is rat her versatile since a single (or a few) desired scalar couplings may be inv estigated in isolation. We illustrate this by discussing in detail the exam ples of an up-specific scalar mediator to dark matter and a muon-specific s calar that may address the muon anomalous magnetic moment discrepancy. LAST-MODIFIED:20180306T140156Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160510T180000Z DTEND:20160510T193000Z DTSTAMP:20260828T094430Z UID:io8pr3bf3uc5mpcpi6ggjvcbd8@google.com CREATED:20160509T132551Z DESCRIPTION:Speaker: Flip Tanedo\n\nSpeaker Institution: UC Irvine/Riversid e\n\nTitle: Evidence for a New 17 MeV Boson in 8Be Transitions\n \nAbstract : Recently\, studies of excited nuclear states of beryllium have found a 6. 8 sigma deviation in the angular distribution and energy spectrum of intern al pair converted electrons. These deviations are consistent with the emiss ion of a new 17 MeV state. We characterize and examine such a state in the context of dark photons and present upcoming experimental checks of this an omaly. LAST-MODIFIED:20160509T140853Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181001T190000Z DTEND:20181001T200000Z DTSTAMP:20260828T094430Z UID:7ie625t6h4s3ib0rklguc12bru@google.com CREATED:20180829T190707Z DESCRIPTION:\nTitle: Structure\, Aggregation\, and Cytotoxicity of Amyloid Beta Peptide\n\nSpeaker: Suren Tatulian\, University of Central Florida\n\n Notes: http://www.marylandbiophysics.umd.edu/seminars/\nAbstract : The amyl oid β (Aβ) peptide plays a major role in Alzheimer's disease (AD) and occur s in multiple forms\, including pyroglutamylated Aβ (AβpE). Identification and characterization of the most cytotoxic Aβ species is necessary for adva ncement in AD diagnostics and therapeutics. While in brain tissue multiple Aβ species act in combination\, structure/toxicity studies and immunotherap y trials have been focused on individual forms of Aβ. As a result\, the mol ecular composition and the structural features of "toxic Aβ oligomers" have remained unresolved. Here\, we have used a novel approach\, hydration from gas phase coupled with isotope-edited Fourier transform infrared (FTIR) sp ectroscopy\, to identify the prefibrillar assemblies formed by Aβ and AβpE and to resolve the structures of both peptides in combination. The peptides form unusual β-sheet oligomers stabilized by intramolecular H-bonding as o pposed to intermolecular H-bonding in the fibrils. Time-dependent morpholog ical changes in peptide assemblies have been visualized by atomic force mic roscopy and transmission electron microscopy. Furthermore\, Aβ/AβpE hetero- oligomers exert unsurpassed cytotoxic effect on PC12 cells as compared to o ligomers of individual peptides or fibrils. These findings lead to a novel concept that Aβ/AβpE hetero-oligomers\, not just Aβ or AβpE oligomers\, con stitute the main neurotoxic species. The hetero-oligomers thus present a ne w biomarker that may be targeted for development of more efficient diagnost ic and immunotherapeutic strategies to combat AD. LAST-MODIFIED:20180910T191250Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160921T180000Z DTEND:20160921T190000Z DTSTAMP:20260828T094430Z UID:ccgr9rgsl4qdkgr4t5qs8qhnus@google.com CREATED:20160908T144323Z DESCRIPTION:Speaker: Krysta Svore\n\nSpeaker Affiliation: Microsoft Researc h\n\nTitle: Optimal Circuit-level Decoding of Surface Codes\n\nAbstract: Su rface codes exploit topological protection to increase error resilience in quantum computing devices and can in principle be implemented in existing h ardware. They are one of the most promising candidates for active error cor rection\, not least due to a polynomial time decoding algorithm which admit s one of the highest predicted error thresholds. In this talk\, we consider the dependence of this threshold on underlying assumptions including diffe rent noise models\, and analyze the performance of a minimum weight perfect matching (MWPM) decoding compared to a mathematically optimal maximum like lihood (ML) decoding. Our ML algorithm tracks the success probabilities for all possible corrections over time and accounts for individual gate failur e probabilities and error propagation due to the syndrome measurement circu it. \nWe present the true error threshold of an optimal circuit-level decod er\, allowing us to draw conclusions about what kind of improvements are po ssible over standard MWPM and ideas for how to develop better decoders in t he future. LAST-MODIFIED:20160916T124621Z LOCATION:3100A Computer and Space Science Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171102T180000Z DTEND:20171102T193000Z DTSTAMP:20260828T094430Z UID:16kj2n552vrvd7d0b2p79sfrnq@google.com CREATED:20170908T205034Z DESCRIPTION:SPEAKER: Jak Chakhalian\, Rutgers University\n\nTITLE: Design er Quantum Matter: From ‘ferrolectric’ metal and magnetic 2D electron gas t o quantum spin liquids\n\nABSTRACT: Complex oxides with correlated electron s are a class of materials characterized by multiple competing and nearly d egenerate ground states due to interactions that create a subtle balance to define the lowest energy state. This notion leads to a wide diversity of i ntriguing properties ranging from high Tc superconductivity to exotic magne tism and spin and orbit entangled phenomena. By utilizing the bulk properti es of these materials as a starting point\, interface between different cla sses of correlated oxides combined with geometrical lattice engineering off er a unique opportunity to break the fundamental symmetries of bulk and dev ise novel many-body and topological phases. These designer structures with enhanced electronic correlations\, spin-orbit coupling\, and lattice geomet ries supporting frustrated magnetic interactions can serve as a remarkably fertile ground for unusual quantum states of matter.\n\nUtilizing our recen t advances in complex oxide growth with the atomic layer precision\,\nwe ca n now combine layers of materials with distinct and often antagonistic orde r parameters to create novel artificial quantum materials. The broken latti ce symmetry\, strain\, and altered chemical and electronic environments at the interfaces then provide a unique platform to manipulate this subtle bal ance and enable novel quantum states. Understanding of these phases\, howev er\, requires detailed microscopic studies of the heterostructure propertie s. To illustrate these challenges and opportunities\, I will address the is sues of manipulating magnetic interactions on the nanoscale and understandi ng the behavior of spins in the ultimate2D limit\, modulated carrier densit y\, and orbital polarization. I will demonstrate the examples of realizatio n of a magnetic 2D electron liquid and ‘ferroelectric’ 2D metal. In additio n\, I will discuss our recent efforts towards designer topological material s with QAH and quantum spin liquid states.\n\nHOST: Johnpierre Paglione LAST-MODIFIED:20171029T122955Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Jak Chakhalian\, Rutgers University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T200000Z DTEND:20161205T210000Z DTSTAMP:20260828T094430Z UID:gf68p262oej30r36i89sbn24pk@google.com CREATED:20161118T134404Z DESCRIPTION:Speaker: Takafumi Oka\n\nSpeaker Affiliation: Keio University\n \nTitle: A Classical Network Protocol to Support Distributed Quantum State Tomography\n\nAbstract: This research presents the design of a classical ne tworking protocol that supports distributed quantum state tomography\, whic h provides necessary information for quantum error correction to work prope rly.\n \nAlso\, the main audience would be familiar with classical communic ation\, but not with quantum physics\, because the conference focuses on cl assical networking as a whole. Therefore the paper provides some of the bac kgrounds on quantum communication as well.\n \nThe paper of the same title is going to be presented at the QCIT (Quantum Communications and Informatio n Technology) Workshop\, held on Thursday\, 8 December\, which is part of I EEE Global Communications Conference\, a conference on classical networking . LAST-MODIFIED:20161128T135151Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170301T200000Z DTEND:20170301T210000Z DTSTAMP:20260828T094430Z UID:i6n4h6vafbssbb295611uftsmc@google.com CREATED:20170222T174015Z DESCRIPTION:Speaker Name: Dr. Robert F. Cahalan\, Emeritus Scientist\n\nSpe aker Institution : NASA/Goddard Space Flight Center and Johns Hopkins Unive rsity Applied Physics Laboratory\n\nTitle: Human Energy Use and Earth’s Ch anging Climate\n\nAbstract : Global disruptions of Earth's climate and bios phere are leading to loss of biodiversity and ecosystem collapses\, depleti on of fish and forests\, loss of fresh water\, ocean acidification and spec ies extinctions. What can be done to address these challenges? Can individu als actually make a difference? Is there a legitimate reason for hope? LAST-MODIFIED:20170222T174247Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170407T161500Z DTEND:20170407T171500Z DTSTAMP:20260828T094430Z UID:413sio9ti3bl7hf0qcuqbl4hjc@google.com CREATED:20170329T142619Z DESCRIPTION:Speaker Name: Rex Lundgren\n\nSpeaker Institution: JQI\n\nTitle : Interactions on the surface of a three-dimensional topological insulator\ n\nAbstract: The gapless surface states of three-dimensional topological in sulators are a new form of matter\, and there is much active research on ex otic order on the surface of topological insulators due to electron-electro n interactions. In this talk\, we investigate electron-electron interaction s on the surface of a three-dimensional topological insulator. First\, we c onstruct a phenomenological Landau theory for the two-dimensional helical F ermi liquid found on the surface of a three-dimensional time-reversal invar iant topological insulator. By projecting quasiparticle states onto the Fer mi surface\, we obtain an effectively spinless\, Landau theory with a singl e Landau parameter per angular momentum channel that captures the spin-mome ntum locking or nontrivial Berry phase of the Fermi surface. Next\, we deri ve equilibrium properties\, criteria for Fermi surface instabilities\, and collective mode dispersions in terms of the projected Landau parameters. In particular\, we investigate the nematic instability of the helical Fermi s urface in detail and discuss various observable consequences of nematic ord er unique to helical Fermi liquids. LAST-MODIFIED:20170329T142619Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170504T163000Z DTEND:20170504T173000Z DTSTAMP:20260828T094430Z UID:he170uggfu1menspvis9lqro34@google.com CREATED:20170221T180604Z DESCRIPTION:Speaker Name: Miguel Sanjuán\n\nSpeaker Institution : Universid ad Rey Juan Carlos\n\nTitle : Nonlinear Dynamics\, Chaos and Complex System s: A historical perspective\n\nAbstract: When we talk about dynamics\, we d o not only understand the motion of celestial bodies and solid mechanical s ystems\, but any changes with respect to time of one or more variables. Fro m that point of view\, we can find dynamics everywhere\, in any field of sc ience. Thus\, now we have a more general vision\, including stock market mo vements and economic variables\, concentration changes in chemical reaction s\, changes in physiological\, biological and medical variables\, action po tentials of neurons\, etc ... providing a more interdisciplinary perspectiv e.\nThe various interactions between the constituent parts of a physical sy stem and their feedback mechanisms\, are a source of nonlinearity and compl exity\, which added to the sensitivity dependence to initial conditions whi ch is a hallmark of chaotic behavior\, constitutes a change of perspective in dynamical systems with important consequences for the understanding of s cience.\nI will give a historical perspective of Nonlinear Dynamics\, Chaos Theory and Complex Systems\, including some of the different sources that have contributed to the construction of the discipline as we know it today. Among them\, the three-body problem in celestial mechanics\, turbulence in fluid dynamics\, irreversibility and fundamentals of statistical physics a nd the logistic map and population dynamics in biology. Many schools of mat hematics and physics have played an essential role in the historical develo pment of the subject\, including the French\, Russian\, Japanese and Americ an school. The knowledge of this historical perspective allows us to unders tand the breadth of the discipline itself and the multiple interdisciplinar y applications to various fields of science. LAST-MODIFIED:20170223T154049Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170403T163000Z DTEND:20170403T183000Z DTSTAMP:20260828T094430Z UID:5gp9g7makl36slsfqi75koc1dc@google.com CREATED:20170329T182029Z DESCRIPTION:http://edibleumd.weebly.com/\n\nThe Edible Book Festival is a world-wide series of events held in April that celebrates books\, food\, a nd bad puns. \n\nParticipants create an 'Edible Book' which must be "bookis h" through "the integration of text\, literary inspiration or\, quite simpl y\, the form."\n\n LAST-MODIFIED:20170329T182330Z LOCATION:Hornbake Plaza SEQUENCE:1 STATUS:CONFIRMED SUMMARY: 5th Annual Edible Book Festival TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171016T110000 DTEND;TZID=America/New_York:20171016T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171016T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Michael Fleischhauer\, Kaiserslautern\n\nTitle: Topolo gical phases of mixed states and their detection\n\nAbstract: What is left of topology at finite temperatures and can topological protection be extend ed to systems with dissipation? Motivated by topological charge pumps\, I w ill introduce a classification for topological phases of matter applicable to finite-temperature states as well as stationary states of driven\, dissi pative systems based on a generalization of the many-body polarization. In contrast to quantized charge transport\, the polarization can be used to pr obe topological properties of non-interacting and interacting closed and op en systems alike and remains a meaningful quantity at finite T. For non-int eracting fermions it defines an ensemble topological phase (ETP)\, which in the thermodynamic limit is the Zak or Berry phase of a ficticious Hamilton ian given by the covariance matrix of single-particle correlations [1]. As examples\, I discuss a Thouless pump in the steady state of one-dimensional lattices driven by Markovian reservoirs [2] and the finite-temperature Ric e-Mele and Harper-Hofstadter models. The ETP winding is shown to be robust against Hamiltonian perturbations as well as homogeneous dephasing and part icle losses. I will also discuss a scheme that maps the covariance matrix t o the hamiltonian of an auxiliary system of free fermions at T=0\, thus all owing to directly observe the ficticious Hamiltonian. Finally I will show t hat the same scheme can be used to transfer topological properties from an interacting to a non-interacting system.\n[1] C.E. Bardyn\, L. Wawer\, A. A ltland\, M. Fleischhauer\, S.Diehl (arxiv: 1706.02741)\n[2] D. Linzner\, L . Wawer\, F. Grusdt\, M. Fleischhauer\, Phys. Rev. B 94\, 201105 (2016) LAST-MODIFIED:20171009T125913Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180206T160000 DTEND;TZID=America/New_York:20180206T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180206T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Robert Schoelkopf\n\nSpeaker Institution: Yale\n\ nTitle: The Prospects for Scalable Quantum Computing with Superconducting C ircuits \n\nAbstract: Dramatic progress has been made in the last decade an d a half towards realizing solid-state systems for quantum information proc essing with superconducting quantum circuits. Artificial atoms (or qubits) based on Josephson junctions have improved their coherence times more than a million-fold\, have been entangled\, and used to perform simple quantum a lgorithms. The next challenge for the field is demonstrating quantum error correction that actually improves the lifetimes\, a necessary step for buil ding more complex systems. At Yale we have been pursuing a hardware-efficie nt approach for error correction\, that relies on encoding information in a bosonic oscillator\, the so-called “cat codes.” With this approach\, we ha ve applied real-time measurements and feedback to achieve the first extensi on of the lifetime of a quantum bit through error correction. For scaling\, an attractive approach is the modular architecture\, in which small quantu m processors are networked together into a larger whole. I will present a r ealization of a gate between logical qubits. This is the first implementati on of a teleported C-NOT gate\, which is a key building block for the modul ar approach. \n\n\nHosted by Chris Lobb and Fred Wellstood LAST-MODIFIED:20180509T201649Z LOCATION:Toll Physics 1412 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium - CNAM Carr Lecture TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170330T163000Z DTEND:20170330T173000Z DTSTAMP:20260828T094430Z UID:h346qbmidvh2sgp6dbk3j29htc@google.com CREATED:20170127T153205Z DESCRIPTION:Speaker Name: Tom Antonsen\n\nSpeaker Institution : Universit y of Maryland Department of Physics\n\nTitle : Some Adjoint Methods in Phy sics and Engineering or How the solution to not my problem just might be th e answer to your problem\n\nAbstract: Physicists and engineers frequently e ncounter situations where calculations of the governing equations of a syst em of interest appear to need to be repeated many times to describe or opti mize the system. It is often the case that only a particular state dependen t quantity or metric needs to be determined. In this case a computational s avings can be achieved if an “adjoint problem” can be found that produces t he desired information without requiring multiple computations. A simple ex ample is the design of a receiving antenna. One wishes to know and optimize the signal received as a function of the incident angle and polarization o f incoming waves. It might appear that solution of Maxwell’s field equation s would have to be repeated for each possible incident direction and polari zation. However\, due to the reciprocal property of the governing equations \, the desired information is obtained by treating the antenna as a transmi tter and calculating the far field radiation pattern. Thus\, one computatio n replaces many. In this talk I will review some problems from the area of charged particle dynamics where adjoint methods have proven useful. A new e xample is the optimization of electron beam optics in beam sources used in microwave and millimeter wave amplifiers. LAST-MODIFIED:20170323T153317Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180315T180000Z DTEND:20180315T193000Z DTSTAMP:20260828T094430Z UID:2o52vh03o9bfr3gcdpenm0u6q9@google.com CREATED:20180306T171937Z DESCRIPTION:SPEAKER: Professor Kater Murch\, Washington University in St. L ouis

TITLE: Realizing a quantum Maxwell’s demon through conti nuous measurement of a superconducting qubit

ABSTRACT: Th ermodynamics is a field of physics that describes quantities such as heat a nd work and their relationship to entropy and temperature. Originally devel oped as a theory to optimize the efficiency of heat engines\, two extension s of thermodynamics in the last century advanced the theory to the point at which quantum mechanics should be incorporated. First\, the role of inform ation in thermodynamics\, given by Shannon\, Jaynes\, and Landauer\, makes strong connections between heat\, entropy and information. Second\, extensi ons of thermodynamics to the realm of microscopic systems in which fluctuat ions are significant allow the application of thermodynamics at the level o f single trajectories of classical particles. Quantum mechanics requires bo th of these features as information and fluctuations are central to the beh avior of quantum systems. The experimental control over single quantum syst ems that has been achieved in this century places us in a unique position t o extend thermodynamics into the quantum regime. I will describe recent exp eriments where we harness tools from quantum information processing with su perconducting qubits to quantify the role of information in a quantum reali zation of Maxwell’s demon.

HOST: Ben Palmer LAST-MODIFIED:20180306T171937Z LOCATION:John S Toll Physics Bldg.\, Room 1201\; Refreshments in the Toll R oom 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Kater Murch\, Washington Univ. in St. Louis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170309T173000Z DTEND:20170309T183000Z DTSTAMP:20260828T094430Z UID:u3t5k0b7llfb38knm4695dvbq0@google.com CREATED:20170306T175302Z DESCRIPTION:PHYS 798E and ENEE 698D\nTitle: Ultra Short Pulse Laser - Matt er Interactions and Potential Applications\nSpeaker: Phillip Sprangle\, ECE \, Physics and IREAP\, U of Md.\n\nAbstract: Ultra short pulse lasers are p resently being used in a number of areas such as manufacturing\, medical re search and ultra high field physics research. This talk will cover some in teresting potential applications of these lasers. The topics to be discuss ed include\, i) optical detection of radioactive material based on ionizati on signatures\, ii) generation of ultra-broadband IR radiation in the atmos pheric transmission window\, 3 – 13 µm\, and iii) acceleration of protons i n a slow laser induced plasma wave. For example\, our proposed mechanism t o accelerate protons involves the shock-excitation of a low phase velocity plasma wave by interacting two counter-propagating laser pulses in a plasma . The laser pulses consist of a forward-propagating short pulse and a coun ter-propagating long pulse. The beating of these laser pulses generate a sl ow forward-propagating plasma wave that can trap and accelerate protons. T he trapping and acceleration is accomplished by appropriately tapering both the plasma density and the amplitude of the backward-propagating pulse. \n \nBIO: Professor of Electrical & Computer Engineering\, Physics and IREAP a t the University of Maryland. His research covers a wide range of fields a nd includes the atmospheric propagation of high-energy lasers\, laser drive n accelerators\, ultra-short pulse laser matter interaction and propagation \, nonlinear optics and free electron lasers. He is a fellow of the OSA\, APS\, IEEE and DEPS. He is winner of the Presidential Rank Award (2015)\, Advanced Accelerator Concept Prize (2014)\, James Clerk Maxwell Prize (2013 )\, Fred E. Saalfeld Award (2012)\, Navy Meritorious Civilian Service Award (2011)\, IEEE Plasma Science Award (2008)\, Sigma Xi Pure Science Award\, (1994)\, International Free Electron Laser Prize (1991)\, E.O. Hulburt Scie nce and Engineering Award (1986)\, two Technology Transfer Awards (1995\, 2 004)\, as well as the Top Navy Scientist and Engineer of the Year Award (20 08). He has published over 300 refereed scientific articles\, and holds 18 U.S. Patents and 2 pending. \n\n\n LAST-MODIFIED:20170306T175302Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180613T180000Z DTEND:20180613T190000Z DTSTAMP:20260828T094430Z UID:2koo1cj9trkj4nllj1b60h0oov@google.com CREATED:20180608T135349Z DESCRIPTION:Title : Evidence of an Intermediate-Scale Energy Spectrum Aniso tropy of Cosmic Rays E≥10^19.2 eV with the Telescope Array Surface Detector \nSpeaker Name: Jonathan Paul Lundquist\nSpeaker Institution : University o f Utah\nAbstract : Evidence for an intermediate-scale energy spectrum aniso tropy has been found in the arrival\ndirections of ultra-high energy cosmic rays for energies greater than 10^19.2 eV the northern\nhemisphere using 7 years of TA surface detector data. The previously reported “Hotspot" exces s\nof events E≥10^19.75 eV is found to correspond to a deficit\, or “Coldsp ot\," of events for\n10^19.2≤E<10^19.75 eV. This feature may suggest energy dependent magnetic deflection of cosmic\n\nrays. The post-trial significan ce of the energy spectrum deviation is found to be 3.74σ. \n\n\n\nNrusso@ic ecube.umd.edu LAST-MODIFIED:20180608T140133Z LOCATION: PSC Rm 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Particle Astrophysics seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160711T190000Z DTEND:20160711T203000Z DTSTAMP:20260828T094430Z UID:ctphg4o6ai97dfqg92hk2gfd3k@google.com CREATED:20160706T134229Z DESCRIPTION:***Event canceled\; Will be rescheduled***\n\nCandidacy Talk fo r MCFP student Simon Riquelme\n\nTitle: Screening the Standard Model from g ravitational Lorentz Violation LAST-MODIFIED:20160711T171348Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELED Simon Riquelme Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20180419 DTEND;VALUE=DATE:20180420 DTSTAMP:20260828T094430Z UID:69i2sav6vhpgsi3d84h5d4g78e@google.com CREATED:20171122T193040Z DESCRIPTION:Speaker: Robert McDermott\, Univ of Wisc\n\nTitle: TBD\n\nAbs tract: TBD\n\nHost: Vladimir Manucharyan LAST-MODIFIED:20171122T193040Z LOCATION:Rm 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Robert McDermott\, Univ of Wisc TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170406T193000Z DTEND:20170406T210000Z DTSTAMP:20260828T094430Z UID:c45lcmrlfm64fcejv9q26ud5h4@google.com CREATED:20170331T190541Z DESCRIPTION:Speaker: Richard Wentworth (UMCP) - \nAbstract: We will go back to Ch. 3 of "Dirichlet Branes and Mirror Symmetry"\, that gets into the he art of the subject. This second lecture will discuss how the twists arise from a U(1)-current in superconformal N=2 field theory.\n LAST-MODIFIED:20170331T190541Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Topological twist in N=2 superconformal field theory (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160428T180000Z DTEND:20160428T193000Z DTSTAMP:20260828T094430Z UID:plcc58dabc4n2ijcu3j3ttvo8c@google.com CREATED:20160418T140225Z DESCRIPTION:Speaker Name: Angela Biselli\n\nSpeaker Institution: Fairfield University\n\nTitle: Deeply Virtual Compton Scattering at Jefferson Lab\n\n Abstract: The Generalized Parton Distributions (GPDs) have emerged as a uni versal tool to de- scribe hadrons in terms of their elementary constituents \, the quarks and the gluons. Deeply Virtual Compton Scattering (DVCS) on a proton or neutron (N)\, eN → e the simplest processes that can be describe d in terms of GPDs. The amplitudes of DVCS and Bethe-Heitler\, process wher e a photon is emitted by the incident or scattered electron\, can be access ed via cross section measurements or exploiting their interference which gi ve rise to spin asymmetries. Spin asymmetries\, cross sections and cross-se ction differences can be connected to different combinations of the four le ading order GPDs (H\, E\, H ̃ \, E ̃) for the two quark flavors depending o n the observable and the type of target. \n\nThis talk focuses on recent DV CS results at Jefferson Lab and gives an overview of the upcoming experimen tal program on DVCS at 12 GeV. Several experiments have been proposed to ex tend and improve the current measurements on polarized and unpolarized prot on and as well as new measurements on neutron target. This program\, once c ompleted\, will bring us a step closer to fully reveal the 3D quark structu re of the nucleon. LAST-MODIFIED:20160419T173455Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160907T190000Z DTEND:20160907T200000Z DTSTAMP:20260828T094430Z UID:4qo2gu26f806n95sjn4io8tafg@google.com CREATED:20160831T193119Z DESCRIPTION:Speaker Name: Prof. Oskar Painter\n\nSpeaker Institution : Inst itute for Quantum Information and Matter and Thomas J. Watson\, Sr.\, Labor atory of Applied Physics\, California Institute of Technology\, Pasadena CA 91125\n \nTitle : Integrating optomechanical and superconducting quantum c ircuits\n\nAbstract : I will present recent work at Caltech on the integrat ion of optomechanical crystals for light and sound with electronic supercon ducting quantum circuits. Utilizing the silicon-on-insulator (SOI) wafer pl atform\, we have made key advances in the fabrication and integration of ex tremely low loss microwave phonon structures and low loss microwave superco nducting resonators of high impedance. These technical advancements offer s everal intriguing opportunities for quantum information processing with pho nons\, photons\, and electrons in an integrated\, wafer-scale platform. Dis cussion of several concepts along these lines being pursued at Caltech will be presented. LAST-MODIFIED:20160831T193317Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170919T150000Z DTEND:20170919T161500Z DTSTAMP:20260828T094430Z UID:0olsmk4jputeumd6vchjadqgsf@google.com CREATED:20170727T194334Z DESCRIPTION:Speaker: Isaac Kim (IBM Research)\n\nTitle: Global symmetries a nd protected quantum gates\n\nAbstract: I will discuss an exactly solvable model that is locally equivalent to the toric code model almost everywhere\ , yet possesses an unusual global Z_3 symmetry. I will explain the physical origin of this symmetry\, and discuss how it can be used to perform a numb er of different protected gates. (Based on a joint work with Ted Yoder)\n\n Host: Junhyun Lee\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n\nWhen: Tues\, Sept. 19 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Physics Bldg.)\n\n LAST-MODIFIED:20170907T201635Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180207T173000Z DTEND:20180207T190000Z DTSTAMP:20260828T094430Z UID:620ngsc8pboi1ct8u3pmcn7pvk@google.com CREATED:20180123T150721Z DESCRIPTION:Speaker: Keh-Fei Liu \n\nSpeaker institution: University of Ke ntucky\n\nTitle: Quark and Glue Spins from Lattice QCD \n\nAbstract: Direc t calculation of the anomalous Ward identity with chiral fermions reveals\n that the smallness of the quark spin is due to the large negative pseudosca lar coupling in the disconnected insertion which overcomes \nthe positive t riangle anomaly to give a negative disconnected insertion contribution to t he flavor-singlet g_A. This would resolve the\n`Proton Spin Crisis'. We wil l also report the large momentum approach which admits lattice calculation of the glue spin. LAST-MODIFIED:20180130T141314Z SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170130T200000Z DTEND:20170130T213000Z DTSTAMP:20260828T094430Z UID:pos8qmu6sos4b93a8stgkiikqo@google.com CREATED:20170110T141307Z DESCRIPTION:Speaker: Akshay Ghalsasi \n\nSpeaker Institution: University of Washington\n\nTitle: Probing nonstandard neutrino cosmology with terrestri al neutrino experiments\n \nAbstract: Neutrino masses and the number of lig ht neutrino species can be tested in a variety of laboratory experiments an d also can be constrained by particle astrophysics and precision cosmology. A conflict between these various results could be an indication of new phy sics in the neutrino sector. In this talk I explore the possibility for rec onciliation of otherwise discrepant results in a simple model containing a light scalar field which produces Mass Varying Neutrinos (MaVaNs). We exten d previous work on MaVaNs to consider issues of neutrino clumping\, the eff ects of additional contributions to neutrino mass\, and reconciliation of e V mass sterile neutrinos with cosmology. LAST-MODIFIED:20170130T153339Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar *New Time* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180214T203000Z DTEND:20180214T213000Z DTSTAMP:20260828T094430Z UID:1u7e7maga5gqvsmqofv10jc97t@google.com CREATED:20180126T162557Z DESCRIPTION:Speaker Name: Dr. Ben Zhu\n\nSpeaker Institution : Dartmouth Co llege\n\nTitle : Global Two-Fluid Study of Tokamak Edge Turbulent Transport \n\n\nAbstract : A flux-driven global code\, Global Drift Ballooning (GDB) model\, based on the drift-reduced Braginskii equations is developed to st udy the low frequency turbulence at the tokamak edge region. In this model\ , profiles of plasma density\, electron and ion temperature\, electric pote ntial\, magnetic flux and parallel flow are self-consistently evolved acros s the entire edge region: from plasma sources in the inner core to plasma s inks in the outer-most scrape-off layer (SOL). GDB has successfully simulat ed realistic Alcator C-Mod L- and H-like plasmas in a simple shifted circul ar configuration\, and reproduced the $\\alpha_{d}-\\alpha_{mhd}$ turbulenc e phase space diagram\, in agreement with the previous local studies. It is also used to study the interaction between turbulence\, global profiles\, and the spontaneous $E{\\times}B$ shear flow that is not captured in the pr evious local studies. In particular\, we find that the spontaneous formatio n of the $E{\\times}B$ drift in the electron diamagnetic drift direction in the closed-flux region can be explained based on the quasi-steady-state io n continuity relation $\\nabla {\\cdot} n \\vec{v}_i {\\approx} 0$. Another interesting phenomenon exhibits in GDB simulations is the up-down asymmetr ic plasma profiles caused by the transverse heat flux. The temperature grad ient driven transverse heat flux heats the ions at the bottom while cools t hem on the top\, and vice versa for electrons. Since the electrons have a f aster parallel thermal diffusion\, the up-down asymmetric pattern on electr on temperature is weaker than ion temperature. As a result\, density profil e is driven to be up-down asymmetric due to the total plasma pressure is up -down symmetric enforced by the force balance constraint. Analysis shows th is effect is profound for cold\, dense plasma with finite temperature gradi ent\; it might be the explanation to the formation of strongly asymmetric d ensity profile when discharge approaches to the density limit observed in e xperiments back from the 80s. Furthermore\, the symmetry breaking also affe cts the spontaneous generated $E{\\times}B$ flow\, resulting two asymmetric convective cells with a net inward particle flux which is typically two or ders larger than the thermal-diffusion theory predicts. LAST-MODIFIED:20180126T162919Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170125T200000Z DTEND:20170125T210000Z DTSTAMP:20260828T094430Z UID:2uusk9su94akm2pp5rn8p3mi8s@google.com CREATED:20170119T012012Z DESCRIPTION:Speaker Name: Prof. Gary Carter\n\nSpeaker Institution : Comput er Science and Electrical Engineering Department\, University of Maryland B altimore County\n\nTitle : Optical Communications\n\nAbstract : A review of some of the LPS optical communications research will be used as a lead in to current high data rate coherent optical communications. LAST-MODIFIED:20170119T012842Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171130T210000Z DTEND:20171130T223000Z DTSTAMP:20260828T094430Z UID:1m517jbo2gok8608p0kvmqi9b6@google.com CREATED:20170928T135718Z DESCRIPTION:Speaker: Jay Sau\n\nSpeaker Institution: University of Maryland \n\nTitle: Majorana modes and Lifshitz transitions in fermionic and Bosonic spin-orbit coupled systems\n\nAbstract: Spin-orbit coupling in solid state systems breaks spin-rotation symmetry in a time-reversal preserving way. I n my talk I will consider a specific combination of spin-orbit and magnetic field in 1+1D that breaks inversion symmetry but preserves a discrete comb ined spin and orbit rotations. In the first part of my talk I will discuss how superconducting fermions in such spin-orbit coupled systems realizes Ma jorana zero modes\, which are are fermion-like excitations that are relate d to those originally proposed by Ettore Majorana. In the second part we di scuss strongly interacting Bosons subject to the same Hamiltonian. This stu dy follows the effective Lagrangian formalism for classifying non-relativis tic Nambu-Goldstone modes due to Watanabe and Murayama. Using this formalis m we derive the existance of an Ising transition between two gapless phases that can be thought of as a superfluid minimally coupled to an Ising gauge field. This coupling between the Ising model and the superfluid turns out to modify the Lorentz-scaling (z=1) transition to a Lifshitz-scaling (z~2) transition. I will discuss present experiments relevant to the first part a nd future experiments for the latter. LAST-MODIFIED:20171115T194103Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180417T160000 DTEND;TZID=America/New_York:20180417T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180417T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Zohreh Davoudi

Speaker Institution: Univer sity of Maryland

Title: The Road to Nuclear Physics from Standard Mo del

Abstract: At the core of nuclear physics is to make predictions for complex phenomena occurring in the hottest and densest environments in nature\, to determine how ordinary matter interacts with mysterious dark ma tter or other new particles\, and to reveal any violation of fundamental sy mmetries of nature using nuclear targets. To achieve an unprecedented preci sion in these questions\, the field has gradually started to eliminate its reliance on phenomenological models\, and has entered an era when the under lying interactions are set to those in the Standard Model of particle physi cs. Light nuclear systems can now emerge directly from quark and gluon degr ees of freedom and with only quantum chromodynamics(QCD) interactions in pl ay\, using the numerical method of lattice QCD. Few-body observable\, such as few-hadron interactions and scattering amplitudes\, as well transition a mplitudes and reaction rates\, have been the focus of this vastly growing f ield. Once obtained from QCD\, and matched to effective field theories\, th ese determinations can advance and improve the nuclear many-body calculatio ns of exceedingly more complex systems. This talk is a brief introduction t o this program and its goals\, with a great focus on a few examples that de monstrate\, most clearly\, the roadmap from the Standard Model to nuclear p hysics.

< br>Hosted by Brian Swingle LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180307T160000Z DTEND:20180307T170000Z DTSTAMP:20260828T094430Z UID:16fcinvousg22cp1k4nm89401k@google.com CREATED:20180227T140724Z DESCRIPTION:Speaker: Kaleb Duelge\, UMCP

Title: (Student seminar) Th e Retention of Protein Solution Phase Conformation as an Aerosol

Abs tract: Protein structure is important for understanding changes in function. \; The scientific community is c onflicted on the use of ion mobility mass spectrometry to measure protein s tructure changes. \; This is a gas phase measurement that may not refle ct the true native protein folding. \; I will present data that suggest s the native structure can be retained briefly for measurement by this devi ce\, and means to prevent gas phase unfolding. LAST-MODIFIED:20180227T140724Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160927T171500Z DTEND:20160927T181500Z DTSTAMP:20260828T094430Z UID:nmj4501nidc9n2ukqen99kh410@google.com CREATED:20160920T183018Z DESCRIPTION:Speaker Name: Dr. Paul Hess\n\nSpeaker Institution : UMD\n\nTit le : Quantum Thermalization and Localization in a Trapped Ion Quantum Simul ator\n\nAbstract : When a system thermalizes it loses all local memory of i ts initial conditions. This is a general feature of open systems and is wel l described by equilibrium statistical mechanics. Even withina closed (or r eversible) quantum system\, where the unitary time evolution retains all in formation about its initial state\, subsystems can still thermalize using t he rest of the system as an effective heat bath. However\, exceptions to th ermalization are rare\, and in thermal systems the dynamics preceding it ar e not well understood. Here\, we prepare arbitrary non-equilibrium initial states and apply Ising or XY Hamiltonians with long-range interactions and determine if the system thermalizes. In the presence of programmable random disorder we observe two signatures of a many-bodylocalized state: memory r etention of the initial conditions and entanglement growth at long times. F or sufficiently long-range interactions we find quasi-stationary prethermal behavior. These experiments demonstrate quantum control exerted over trapp ed ions that will soon allow quantum simulation that cannot be modeled clas sically. LAST-MODIFIED:20160920T183517Z LOCATION: IPST Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171103T110000 DTEND;TZID=America/New_York:20171103T115000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com RECURRENCE-ID;TZID=America/New_York:20171027T110000 CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nSixth lecture: Other Machine Learning Techniques (supervised\, unsup ervised\, SVMS\, culstering\, Bayesian\, Decision Tree\, sk-learn)\n\nCours e description: This short course covers the fundamentals of machine learnin g\, assuming the typical background and motives of a physicist. It's goal i s to give those who attend an understanding of the field and its capabiliti es\, as well the tools to learn the necessary extensions of the topic to ap ply it to their physics research. Lectures will include introductions to Py thon\, Linux\, neural nets\, deep learning\, natural language processing\, imagine recognition/computer vision\, and AI safety.\n\nRSVP for the first friday here: http://bit.ly/2xgpvDE\njustinkterry@gmail.com LAST-MODIFIED:20171020T151838Z LOCATION:Edward St. John 2208 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180405T180000Z DTEND:20180405T193000Z DTSTAMP:20260828T094430Z UID:14vqo1b99dkoi95112kb9p384t@google.com CREATED:20180127T185226Z DESCRIPTION:Speaker: \; Long Ju\, Cornell University

Title: \; TunableBerry Phase and Berry Curvature Effects in Bilayer Graphene

Abstract: \; Berryphase played an important role i n quantum mechanics and underlay the physics ofa wide range of materials fr om topological phases of matters to various 2Dmaterials. While the effect o f Berry phase has been extensively shown asquantized conductance in transpo rt experiment\, the geometric aspect of wave function—determined by Berry c urvature has remained much less understood experimentally.In this talk\, I will use bilayer graphene as a model system to demonstrate effectsof both B erry phase and Berry curvature on materials’ electronic and opticalproperti es. I will first show our study of topological valley transport in thestack ing domain walls of bilayer graphene\, where near field infrared nanoscopyi s combined with low temperature transport measurement. Then I will report o urstudy of excitons in the tunable bandgap of bilayer graphene using advanc edspectroscopy tools. These excitons obey unusual valley-dependent opticals election rules and very large magnetic moment\, both originate from the tun ablepseudospin and Berry curvature effect.


< /p>Host: \; Dennis Drew LAST-MODIFIED:20180327T151305Z LOCATION:Room 1201 John S Toll Bldg.\, Colloquium Tea @ 1:30 in room 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Long Ju\, Cornell University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170412T190000Z DTEND:20170412T200000Z DTSTAMP:20260828T094430Z UID:1505EB54-989E-4446-A15C-7EDA3E32C0A8 CREATED:20170406T055746Z DESCRIPTION:Speaker Name: Dr. Michael Krainak\n\nSpeaker Institution : NASA Goddard Space Flight Center\n\nTitle : Integrated Photonics at NASA\n\nAbs tract : Integrated photonics generally is the integration of multiple litho graphically defined photonic and electronic components and devices (e.g. la sers\, detectors\, waveguides/passive structures\, modulators\, electronic control and optical interconnects) on a single platform with nanometer-scal e feature sizes. The development of photonic integrated circuits permits si ze\, weight\, power and cost reductions for spacecraft microprocessors\, op tical communication\, processor buses\, advanced data processing\, and inte grated optic science instrument optical systems\, subsystems and components . This is particularly critical for small spacecraft platforms. On July 27\ , 2015\, Vice President Joe Biden\, at an event in Rochester\, NY\, announc ed that the New York consortium had been selected to lead the Integrated Ph otonics Institute for Manufacturing Innovation (IP-IMI). Proposed as part o f President Obama's National Network for Manufacturing Innovation (NNMI)\, the IP-IMI was established with $110M to bring government\, industry\, and academia together to advance state-of-the-art photonics technology. The Ins titute will develop and demonstrate innovative manufacturing technologies f or: Ultra-high-speed transmission of signals for the internet and telecommu nications New high-performance information-processing systems and computing Compact sensor applications enabling dramatic medical advances in diagnost ics and treatment Multi-sensor applications including urban navigation\, fr ee space optical communications and quantum information sciences Other dive rse military applications including electronic warfare\, analog RF sensing\ , communications\, and chemical/biological detection We will give an overvi ew of integrated photonics and some NASA applications.\n\n LAST-MODIFIED:20170407T195942Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170519T120000Z DTEND:20170519T203000Z DTSTAMP:20260828T094430Z UID:sf5f4hli6ekeeno1qp4hj35550@google.com CLASS:PUBLIC CREATED:20170510T184626Z DESCRIPTION:Registration required\n\n9:00 AMWolfgang Ketterle\, MIT\n10:00 AMAna Maria Rey\, JILA\n11:00 AMMikhail Lukin\, Harvard University\n1:00 PM Ataç İmamoğlu\, ETH Zurich\n2:00 PMAllan MacDonald\, University of Texas\n3 :30 PMHanhee Paik\, IBM\n4:30 PMChris Monroe\, UMD LAST-MODIFIED:20170511T202901Z LOCATION:Charles Carroll Room in Stamp SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI 10th Anniversary TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170810T173000Z DTEND:20170810T180000Z DTSTAMP:20260828T094430Z UID:gk2cojioe1kul673fjm124r5dc@google.com CREATED:20170724T141009Z DESCRIPTION:Speakers: Jiahui Liu & Prayaag Venkat \n\nSpeaker Affiliations: Columbia University & UMD\n\nTitle: On the Relationship between Lower Boun d Methods in Communication Complexity\n\nAbstract: Communication complexity studies the minimum number of bits distributed parties must communicate in order to perform some joint computation. In the restricted model of commun ication complexity\, unconditional lower bounds can be proven\, leading to hardness results for many other problems of interest in computer science. O ver the past few decades\, numerous lower bound methods have been introduce d. Present work aims to unify these lower bounds through linear programming and characterize the relationship between them. In this talk\, we discuss ongoing work that aims to investigate the relationship between the three mo st powerful of these methods\, the partition bound\, the relaxed partition bound\, and the relative discrepancy bound. This talk is based on work done this summer by Jiahui Liu and Prayaag Venkat\, under the guidance of Pengh ui Yao and Andrew Childs.\n\n*This is a REU Final Presentation for QuICS* LAST-MODIFIED:20170803T145952Z LOCATION:3100A - Large Conference Room (max capacity: 35 people) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170330T193000Z DTEND:20170330T210000Z DTSTAMP:20260828T094430Z UID:tqfmn406ar5r8g5vk5gqe8vops@google.com CREATED:20170317T180924Z DESCRIPTION:Speaker: Richard Wentworth (UMCP) - \nAbstract: We will go back to Ch. 3 of "Dirichlet Branes and Mirror Symmetry\, that gets into the hea rt of the subject.\n LAST-MODIFIED:20170317T180924Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Topological twist in N=2 superconformal field theory\, I TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180221T210000Z DTEND:20180221T223000Z DTSTAMP:20260828T094430Z UID:52mgjoqg48bvij8h3ru3jrhfek@google.com CREATED:20180213T210446Z DESCRIPTION:Speaker Name: Diego Tonelli\n\nSpeaker Institution: INFN\n\nTit le: Challenging the standard model with charm at the LHC \n\nAbstract: D iscrepancies between theory predictions and measurements of low-energy quan tities may reveal virtual contributions of non-standard-model particles or interactions prior to their direct observation. Historically\, such an ”ind irect” approach has been rewarding\, especially in quark-flavor dynamics. The LHCb experiment at the LHC proton-proton collider has access to the wor ld’s largest samples of charm-meson decays. I will discuss recent charm phy sics results\, focusing on a few that offer the highest potential to challe nge the standard model. LAST-MODIFIED:20180214T205036Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170911T110000 DTEND;TZID=America/New_York:20170911T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20170911T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Daniel Lidar\, USC\n\nTitle: Error suppression for Ham iltonian quantum computation\n\nAbstract: We present general conditions for quantum error suppression for Hamiltonian-based quantum computation using subsystem codes. This involves encoding the Hamiltonian performing the comp utation using an error detecting subsystem code and the addition of a penal ty term that commutes with the encoded Hamiltonian. The scheme includes the stabilizer formalism of both subspace and subsystem codes as special cases . We derive performance bounds and show that complete error suppression res ults in the large penalty limit. We illustrate the power of subsystem-based error suppression with several examples of two-local constructions for pro tection against local errors\, which circumvent an earlier no-go theorem ab out two-local commuting Hamiltonians. We also discuss the generalization of the quantum error suppression results of Jordan\, Farhi\, and Shor to arbi trary Markovian dynamics. In this setting we show that it is possible to su ppress the initial decay out of the encoded ground state with an energy pen alty strength that grows only logarithmically in the system size\, at a fix ed temperature.\n\nJoint work with Milad Marvian:\nPRL 118\, 030504 (2017)\ nPRA 95\, 032302 (2017)\n\n\n*THERE WILL BE NO LUNCH OR TEA* LAST-MODIFIED:20170907T134837Z LOCATION:College Park Marriott Hotel & Conference Center\, 3501 University Blvd E\, Hyattsville\, MD 20783\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180925T200000Z DTEND:20180925T210000Z DTSTAMP:20260828T094430Z UID:7isnfcohr43rpk6fvho4fjm7oq@google.com CREATED:20180904T183515Z DESCRIPTION:Speaker: Alberto Belloni\, University of Maryland\n\nTitle: P utting to test the Standard Model of Particle Physics\n\nAbstract: The Sta ndard Model is the theory that describes how elementary particles interact via the electro-magnetic\, weak\, and strong forces. It successfully withst ood more than 40 years of precision tests\, but we do know it is not comple te. It does not include gravity\, and it does not provide a description of dark energy\, nor of dark matter\, the existence of which astronomical and cosmological observations unambiguously indicate. I will present complement ary methods I utilize to put the Standard Model through its paces\, with da ta collected by the CMS detector at the LHC. I will not forget to discuss h ow a collaboration of ~4000 members from more than 40 countries operates su ccessfully one of the most complex experimental facilities ever built. LAST-MODIFIED:20180904T184221Z LOCATION:PSC Lobby SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180301T190000Z DTEND:20180301T203000Z DTSTAMP:20260828T094430Z UID:001nbn4ji43h00lsq5scfp1d8r@google.com CREATED:20180216T195738Z DESCRIPTION:

SPEAKER: Ian Appelbaum\, UMD

TITLE: \; Hidd en spin polarization?

ABSTRACT: In the presence of time-reversal symmetry\, spin degeneracy is im mune against spin-orbit interaction in centrosymmetric lattices (i.e. struc tures that possess inversion symmetry). However\, many such structures can be decomposed into complementary but NONcentrosymmetric sublattice "sectors ". Does it make sense to assign a distinct -- and spin-split -- electronic structure to each one of these coupled components? Recent work using comput ationally opaque density functional theory\, along with subsequent experime ntal analysis using spin-polarized ARPES on layered 2D materials appears to say yes. In this talk\, I will use simple analytic models to argue for str ict caveats to this point of view. \; [http s://arxiv.org/abs/1801.10581] LAST-MODIFIED:20180222T223124Z LOCATION:room 1201 John S Toll Physics Bldg.\, refreshments in room 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Ian Appelbaum\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170803T180000Z DTEND:20170803T190000Z DTSTAMP:20260828T094430Z UID:tgftp8gd0lv8uf2qc4nfe4lfpk@google.com CREATED:20170724T195155Z DESCRIPTION:Speaker: Eneet Kaur\n\nSpeaker Affiliation: Louisiana State Uni versity\n\nTitle: Conditional Mutual Information and Quantum Steering\n\nAb stract: Quantum steering has recently been formalized in the framework of a resource theory of steering\, and several quantifiers have already been in troduced. We propose the intrinsic steerability as an information-theoretic quantifier of steering that uses conditional mutual information to measure the deviation of a given assemblage from an assemblage having a local hidd en-state model. We prove that this quantifier is a steering monotone (i.e.\ , it is faithful\, convex\, and non-increasing under one-way local operatio ns and classical communication). This suggests that the intrinsic steerabil ity should find applications in protocols where steering is relevant. We th en consider a restricted version of intrinsic steerability\, which is a ste ering monotone under a restricted set of free operations. The restricted in trinsic steerability is additive with respect to tensor-product assemblages \, and it is also monogamous. LAST-MODIFIED:20170724T195155Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161214T200000Z DTEND:20161214T210000Z DTSTAMP:20260828T094430Z UID:smhb138loube6rte3rnnl730vs@google.com CREATED:20161208T140136Z DESCRIPTION:Speaker Name: Prof. Thomas S. Murphy\n\nSpeaker Institution : D epartment of Electrical and Computer Engineering\, University of Maryland\n \nTitle : Graphene Plasmonic Devices for Optoelectronic and Nonlinear Appli cations\n\nAbstract : When a conductor is illuminated with light\, its elec trons can oscillate in collective motion called a plasmon resonance. In met als\, these plasmons occur at visible wavelengths\, but in graphene the mot ion happens at much slower terahertz frequencies\, and the resonant frequen cy can be electrostatically tuned by applying a voltage. Tunable graphene p lasmonic resonators have been suggested for use in terahertz filters\, modu lators\, detectors\, and emitters\, and could find widespread applications in science\, medicine\, security\, and communications. This presentation wi ll discuss progress in the development of practical graphene-based plasmoni c devices\, and recent experimental measurements and theoretical models tha t exploit plasmonic resonances for terahertz detection\, filtering\, and mo dulation.\n LAST-MODIFIED:20161212T182707Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160921T150000Z DTEND:20160921T160000Z DTSTAMP:20260828T094430Z UID:5jonfj7b0aklnu68padc688t0s@google.com CREATED:20160908T142157Z DESCRIPTION:Speaker: Dominique Unruh \n\nSpeaker Affiliation: University of Tartu\n\nTitle:Quantum-security of commitment schemes and hash functions\n \nAbstract: Commitment schemes are a fundamental primitive in cryptography. Their security (more precisely the computational binding property) is clos ely tied to the notion of collision-resistance of hash functions. Classical definitions of binding and collision-resistance turn out too be weaker tha n expected when used in the quantum setting. We present strengthened notion s (collapse-binding commitments and collapsing hash functions)\, explain wh y they are "better"\, and show how they be realized under standard assumpti ons. LAST-MODIFIED:20160908T143910Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161213T190000Z DTEND:20161213T200000Z DTSTAMP:20260828T094430Z UID:dv8g6ltgaagh82aie4napei5kg@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.dv8g6ltgaagh82a ie4napei5kg CREATED:20161209T210353Z DESCRIPTION:Title: Multicomponent fractional quantum Hall phases induced by light\nSpeaker: Areg Ghazaryan (The City College of New York)\n\nAbstract: Multicomponent fractional quantum Hall phases are realized when particles have additional degree of freedom like spin\, layer or valley index (pseudo spin) and the "pseudospin Zeeman effect" is not strong compared to Coulomb interaction to polarize the system. In this talk I will first review previ ously realized multicomponent fractional quantum Hall systems. Afterwards\, I will present our new work on obtaining bilayer fractional quantum Hall s ystems in graphene under magnetic field coupled with light. In such systems the role of the layer is played by Landau level index and hopping between the layers is controlled by light-matter interaction strength. I will prese nt the realizable fractional quantum Hall phases in these systems for 2/3 f illing\, and analyze the special type of interaction responsible for these phases. I will also show that the form of the interaction distinguishes the se systems from previously studied bilayer systems.​\n\n*Hosted by Mohammad Hafezi.*\n\nWhen: Tuesday\, Dec 13th 2:00pm\nWhere: CSS 2115\n\nJoin with Google Hangouts: https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc1Y jhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.dv8g6ltgaagh82aie 4napei5kg?hs=121 LAST-MODIFIED:20161209T214913Z LOCATION:2115 Atlantic Bldg\, College Park\, MD 20742 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171026T180000Z DTEND:20171026T193000Z DTSTAMP:20260828T094430Z UID:6nuds180hoofnslmn2vmbvcu03@google.com CREATED:20170908T202739Z DESCRIPTION:SPEAKER: Ken Burch\, Boston College\n\nTITLE: An Unconventiona l Approach to Topological Superconductivity \n\nTITLE: There is keen inter est in finding new states of matter at the interface between topological an d superconducting materials. Exfoliation and van-der-Waals heterostructures have opened entirely new routes to this pursuit\, with most efforts focuse d on conventional s-wave superconductors. In this talk\, I will discuss a r elated method our group has developed enabling a proximity effect between h igh Tc cuprate superconductors and various Dirac materials. In addition to providing evidence for the proximity effect\, I will discuss new excitation s we have observed at the interface between topological materials and high Tc cuprates as well as Fe chalcogenides. \n\nHOST: V. Yakovenko LAST-MODIFIED:20170908T204122Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Ken Burch\, Boston College TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171120T213000Z DTEND:20171120T223000Z DTSTAMP:20260828T094430Z UID:3betacaq3d81m1lritqcptdbal@google.com CREATED:20171107T222807Z DESCRIPTION:Title : High-energy gamma rays from particle accelerators in th e Galaxy\nSpeaker Name: Elizabeth Hays \nSpeaker Institution : NASA Goddard Space Flight Center\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : Gamma rays have been pursued for a long time as a probe of sources that ac celerate cosmic rays. Often\, measurements of the shape of the gamma-ray sp ectrum of sources have been pursued as evidence of sites of hadronic accele ration and the relative contribution of various mechanisms. In this seminar I will talk about several types of time-domain gamma-ray observations that are pushing the understanding of mechanisms at work in Galactic accelerato rs. The extremely rapid variability of the gamma-ray flares from the Crab N ebula\, extending to energies that defy the synchrotron cutoff energy\, hav e motivated fresh looks at particle acceleration in pulsar wind nebulae. Th e detection of gamma rays from Galactic novae is another case where informa tion about time development in gamma rays and at other wavelengths provides new insight into where and how acceleration occurs. We can use these examp les to think about the ways that future observations may inform our underst anding of Galactic particle accelerators. LAST-MODIFIED:20171107T222807Z LOCATION:Atlantic Building Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161003T190000Z DTEND:20161003T200000Z DTSTAMP:20260828T094430Z UID:6cgvq9gv0du8ki2sg8pcl0nntc@google.com CREATED:20160926T161058Z DESCRIPTION:Speaker Name: Dr. Tanmay Vachaspati\n\nSpeaker Institution : Ar izona State University\n\nNotes: Refreshments available beginning at 2:30 p m.\n\nTitle: Intergalactic Magnetic Field Observations and their Fundamenta l Implications\n\nAbstract : I will review current observational evidence f or helical intergalactic magnetic fields at the ~10^-14 G level on ~10 Mpc length scales. The existence of magnetic fields in cosmic voids and their n on-trivial helical structure suggest that they might have originated in the early universe due to CP violating fundamental interactions. The large hel icity of the magnetic field suggests a possible crucial role for chiral MHD effects in the early universe.\n\nhttps://jsi.astro.umd.edu/jsi-colloquium -series\n LAST-MODIFIED:20161003T130824Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium - Intergalactic Magnetic Field Observations and thei r Fundamental Implications TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180330T200000Z DTEND:20180330T204000Z DTSTAMP:20260828T094430Z UID:5juve7mm5pla24fibtkn3rouff@google.com CREATED:20180320T181323Z DESCRIPTION:Speaker: Norbert M Linke\n\nAffiliation: JQI\n\nTitle: Phonon h opping and blockade with trapped ions\n\nAbstract: Control over individuall y trapped ions has developed rapidly in recent years. Thanks to their unmat ched coherence properties\, and long-range coupling via the Coulomb interac tion\, they have become a versatile platform employed for a large variety o f experimental goals. \nHere we apply these new capabilities to study Boson hopping dynamics using selectively prepared single phonons in the local mo des of motion of individual ions. Each ion additionally carries a spin degr ee of freedom which can be coupled to the motion. This gives rise to polari tonic states which change the dynamics of the system in a controllable way. We observe this phenomenon in a chain of three ions by creating a phonon b lockade [1].\nThis is the first step towards opening up a wide range of qua ntum effects to be studied\, including many-body Jaynes-Cummings-Hubbard mo del dynamics which are difficult to simulate on a classical computer.\n\n[1 ] S. Debnath\, N.M. Linke\, S.-T. Wang\, C. Figgatt\, K.A. Landsman\, L.-M. Duan\, C. Monroe\, Phys. Rev. Lett. 120\, 073001 (2018).\n\nNote: There wi ll be snacks and drinks at 4:00 and the talk is from 4:10 to 4:40 LAST-MODIFIED:20180320T181837Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170406T144500Z DTEND:20170406T154500Z DTSTAMP:20260828T094430Z UID:oi7f2mmuvtkanu7au4fdipmpfk@google.com CREATED:20170331T205554Z DESCRIPTION:STUDENT: YI-HSIEH WANG\n \nAFFILIATION: CHEMICAL PHYSICS PROGRA M\n INSTITUTION OF PHYSICAL SCIENCE & TECHNOLOGY\,\n UNIVERSITY OF MARYLAND\n \nTITLE: PAIR CREATION AND PAIR ANNIHILATION in BOSE-EINSTEIN CONDENSATES\nABSTRACT:\n \nThis thesis covers three applicati ons of Bose-Einstein condensates and related phenomena\, in the theme of pa ir creation and pair annihilation.\n \nFirst\, Bose-Einstein condensates (B EC) are viewed as one of the candidates to implement a sonic black hole. Th is can lead to the observation of analog Hawking radiation\, resulting from a phonon pair creation at a black-hole horizon (BH). Such implementation h as been achieved in a resent experiment by J. Steinhauer\, in which a black -hole/white-hole pair has been produced. He also reported the observations of self-amplifying Hawking radiation\, via a lasing mechanism operating bet ween the black and white-hole horizons. Through our simulations\, we find t hat the observations should be attributed not to the black hole laser effec t\, but rather to a growing zero-frequency bow wave\, generated at the whit e-hole horizon. The relative motion of the two horizons produces a Doppler shift of the bow wave at the BH\, where it stimulates a monochromatic Hawki ng radiation. We also find that shot-to-shot atom number variations and qua ntum fluctuations give density-density correlations consistent with those r eported in the experiments. In particular\, atom number variations can prod uce a spurious correlation signal.\n \nSecondly\, a sonic black hole/white hole pair and phonon pair creation can also be realized using a ring-shaped condensate. Here we focus on the phonon spectroscopy of a ring condensate. We probe the phonon excitation spectrum by applying a harmonically driven barrier to a 23Na Bose-Einstein condensate in a ring-shaped trap. When exci ted resonantly\, these wavepackets display a regular periodic structure. Th e resonant frequencies depend upon the particular configuration of the barr ier\, but are commensurate with the orbital frequency of a sound wave trave ling around the ring. Energy transfer to the condensate over many cycles of the periodic wavepacket motion causes enhanced atom loss from the trap at resonant frequencies. Solutions of the Gross-Pitaevskii (GP) equation exhib it quantitative agreement with the experimental data.\n \nThirdly\, positro nium (Ps) BECs have been of experimental and theoretical interest due to th eir potential application as the gain medium of a gamma-ray laser. Ps BECs are intrinsically spinor due to the presence of ortho- (o-Ps) and para-posi tronium (p-Ps)\, whose annihilation lifetimes differ by three orders of mag nitude. We study the spinor dynamics and annihilation processes in the p-Ps /o-Ps system using both solutions of the GP equations and a rate-equation a pproach. For an initially unpolarized condensate\, there is a threshold den sity at which spin mixing between o-Ps and p-Ps occurs. Beyond this thresho ld\, there are unstable spatial modes accompanied by spin mixing. To ensure a high production yield above the critical density\, a careful choice of e xternal field must be made to avoid the spin mixing instability.\n \nProfes sor Theodore A. Jacobson\, Chair\nProfessor Gretchen Campbell\nDr. Charles Clark - JQI\nProfessor Michael Coplan\nProfessor Christopher Jarzynski\, De an’s Representative \n LAST-MODIFIED:20170331T205717Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Dissertation Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171207T173000Z DTEND:20171207T183000Z DTSTAMP:20260828T094430Z UID:5pitdh7notnmuo8h0kasqq247q@google.com CREATED:20170830T183635Z DESCRIPTION:Gil Bub McGill University | Department of Physiology\nTitle: O ptical Control of Excitation Waves in A Biological Excitable Medium\nAbstra ct: Macroscopic excitation waves are found in a diverse range of settings i ncluding chemical reactions and the heart and brain. In the case of living biological tissue\, the spatiotemporal patterns formed by these excitation waves are different in healthy and diseased states. Current electrical and pharmacological methods for wave modulation lack the spatiotemporal precisi on needed to control these patterns. Optical methods have the potential to overcome these limitations\, but until recently have only been demonstrated in simple systems. Here I discuss results using a new dye-free optical ima ging modality with optogenetic actuation to achieve dynamic control of card iac excitation waves. Illumination with patterned light is demonstrated to optically control the direction\, speed\, and spiral chirality of such wave s in cardiac tissue. This all-optical approach offers a new experimental pl atform for the study and control of pattern formation in complex biological excitable systems. LAST-MODIFIED:20170911T180228Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180328T150000Z DTEND:20180328T161500Z DTSTAMP:20260828T094430Z UID:3ngrhu887v5pab8g8d1prs9ndl@google.com CREATED:20180122T234923Z DESCRIPTION:Speaker: Liang Fu (MIT)

Title: Topology of finite-lifeti me quasipartices and non-Hermitian quantum mechanics

Abstract: Quasiparticles in many-body systems generally have a finite lifetime due t o electron-electron\, electron-phonon and electron-impurity scatterings. I will show that in small-gap systems\, the decay of a quasiparticle can alte r its energy-momentum dispersion significantly\, for example\, transform a two-dimensional Dirac point into a \; nodal arc that ends at topologica l exceptional points. Properties of finite-lifetime quasiparticles are natu rally described by non-Hermitian Hamiltonians that include imaginary part o f self energy.

Host: Brian Swingle and Tom Iadecola

http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20180321T165852Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170406T163000Z DTEND:20170406T173000Z DTSTAMP:20260828T094430Z UID:s2s63li471rnvu6d8thkn5t7so@google.com CREATED:20170403T181351Z DESCRIPTION:PHYS 798E and ENEE 698D\n \nTitle: “SAMI3 Prediction of the Imp act of the August 21\, 2017 Total Solar Eclipse on the Ionosphere/Plasmasph ere System”\n \nSpeaker: Dr. Joseph Huba\, \n Naval Researc h Laboratory\n \nAbstract: On August 21\, 2017 a total solar eclipse will t raverse the continental United States starting in Oregon and ending in Sout h Carolina. In addition to occulting the visible radiation from the sun\, t he eclipse will also partially occult the EUV spectrum from the sun which i s responsible for the photoionization of the earth's upper atmosphere creat ing the ionosphere. In this talk we present a simulation study of the impa ct of the upcoming total solar eclipse on the ionosphere and plasmasphere u sing the NRL model SAMI3. We find that the reduction in solar EUV causes t he electron density to decrease by up to a factor of 2 in the F region beca use of dissociative recombination. Associated with this decrease in the ele ctron density there is a decrease in the total electron content (TEC) by up to 8 TECU (roughly a 40% decrease in TEC). The photoelectron heating of th e electrons is also reduced\; this leads to a cooling of the electrons by u p to 700 K in the upper ionosphere and plasmasphere. The reduction of ionos pheric pressure in the F region during the eclipse also causes the O+ veloc ity to reverse direction from upward to downward with a velocity 30 m/s. La stly\, the continental size modification of the ionospheric conductance mod ifies the global electric field which leads to changes in the TEC < 1 TECU in the southern conjugate hemisphere.\n \nBIO: Dr. Huba is Head of the Spac e Plasma Physics Section of the Beam Physics Branch at the Naval Research L aboratory. He received his PhD from the University of Maryland in 1975. H is current research interests include the study of ionospheric and magnetos pheric processes\, and modeling the earth's ionosphere/plasmasphere system. He has written a 3D Hall MHD code (VooDoo) based upon a novel algorithm t hat he developed to study Hall reconnection physics. More recently\, he ha s developed (with Dr. G. Joyce) the NRL ionospheric models SAMI2 and SAMI3\ , and promoted the SAMI2 Open Source Project ({http://wwwppd.nrl.navy.mil/s ami2-OSP/}). Dr. Huba has over 195 publications in refereed journals in the se areas. Dr. Huba won the Department of the Navy Dr. Delores M. Etter Top Scientists and Engineers award for 2012. He also won the prestigious Naval Research Laboratory E.O. Hulburt Award in 2008\; this award is the highest honor bestowed by NRL for scientific achievement. Dr. Huba presented Michae l Buonsanto Memorial Lecture at MIT Haystack Observatory\, and was awarded the 2011 NSF CEDAR Prize Lecture\, presented in June\, 2011 in Santa Fe\, N M. Dr. Huba is an Affiliate Scientist with the National Center for Atmosphe ric Research (NCAR).Dr.Huba is a Fellow of the American Geophysical Union a nd the American Physical Society. He was awarded the Editor's Citation for Excellence in Refereeing (Journal of Geophysical Research: Space Physics) i n 1992\, 1999\, and 2003. Dr. Huba received an NRL Research Publication Aw ard in 1981\, 2004\, 2010\, and 2015. He was an Associate Editor for the Jo urnal of Geophysical Research (1983 to 1986) and an Assistant Editor of the Reviews of Geophysics (2000 to 2003). Dr. Huba was a member\nof the NSF CE DAR Science Steering Committee (2007 to 2010)\, and the NSF Geoscience Port folio Review panel (2015). Dr. Huba is the custodian of the well-known NRL Plasma Formulary.\n\n LAST-MODIFIED:20170403T181351Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171205T160000 DTEND;TZID=America/New_York:20171205T170000 DTSTAMP:20260828T094430Z UID:19ik9djbiboiuqc2dg02lvv26r@google.com RECURRENCE-ID;TZID=America/New_York:20171205T160000 CREATED:20170809T181538Z DESCRIPTION:Kate Brown\, UMBC\nHosted by Victor Yakovenko\n\nThe Great Cher nobyl Hoax: How Chernobyl Health Problems Were Forgotten as Soon as They We re Discovered \n\nAfter the Chernobyl disaster\, scientists around the worl d called for a long-term study on the\nhealth effects of Chernobyl exposure s to the 4.5 million people most directly exposed. That\nstudy never occurr ed\, nor do scientists today claim to know much about a range of health\nef fects from long-term\, low-dose exposures to ionizing radiation. Brown expl ores the archival history of early Soviet revelations of a public health di saster occurring in the contaminated lands and how that story disappeared f rom the scientific consensus. The case points to political and environmenta l predicaments today in the age of the Anthropocene.\n\nKate Brown lives in Washington\, DC and is Professor of History at UMBC. She is the author of Plutopia: Nuclear Families in Atomic Cities and the Great Soviet and Americ an Plutonium Disasters (Oxford 2013)\, which won seven book prizes\, includ ing the Dunning and Beveridge prizes from the American Historical Associati on for the best book in American history. Brown’s A Biography of No Place: From Ethnic Borderland to Soviet Heartland (Harvard 2004) was awarded the A merican Historical Association’s George Louis Beer Prize for the Best Book in International European History. Brown’s most recent book\, Dispatches fr om Dystopia: History of Places Not Yet Forgotten\, was published in 2015. B rown is the recipient of many fellowships\, including from the John D. Gugg enheim Foundation\, the American Council of Learned Societies\, the Nationa l Endowment for Humanities. She is currently writing a history of human sur vival and endurance in communities circling the Chernobyl Zone. The book\, A Manual for Disaster\, will be published by Norton (US) and Penguin (UK) i n 2019. LAST-MODIFIED:20171205T204032Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20160929T150000Z DTEND:20160929T160000Z DTSTAMP:20260828T094430Z UID:dcddqliqcf1t9bg7edtt83q3s8@google.com CREATED:20160829T211022Z DESCRIPTION:Speaker: Matteo Rizzi (University of Mainz\, Germany)\n\nTitle: Strongly-correlated SU(N)-fermionic mixtures in one-dimensional harmonic t raps\n\nAbstract: We consider a repulsively interacting multicomponent Ferm i gas under harmonic confinement\, as recently realized in the experiment o f Pagano et al. [Nat. Phys. 10\, 198 (2014)]. This setup realizes a gas wit h tunable $SU(N)$ symmetry. In this talk\, we concentrate on the density- a nd momentum-distributions of particles in such a setup\, and present result s both for the strongly-interacting limit and for finite interactions.\n\nA particular focus will be on the so-called Tan's contact - the weight of a $k^{-4}-scaling which is observed in the tails of momentum distributions of general contact-interacting systems. We exploit an exact solution at infin ite repulsion to show a direct correspondence between the value of the Tan' s contact for each of the N components of the gas and the Young tableaux fo r the $S_N$ permutation symmetry group identifying the magnetic structure o f the ground-state. This opens an alternative route for the experimental de termination of magnetic configurations in cold atomic gases\, employing onl y standard (spin-resolved) time-of-flight techniques.\n\nDeparting from the exact solution in the infinitely-interacting regime\, we then present an a nalytical scaling prediction for the Tan's contact at finite interactions w ith respect to the number of fermions\, the number of components and the in teraction strength and show its qualitative agreement with recent experimen ts. Along the way\, we introduce the analytical (low density approximation\ , Bethe-ansatz) and numerical techniques (MPS/DMRG) used in the investigati on. \n\nJ. Decamp\, J. Jünemann\, M. Albert\, M. Rizzi\, A. Minguzzi\, and P. Vignolo\, \n"High-momentum tails as magnetic structure probes for strong ly-correlated SU(k) fermionic mixtures in one-dimensional traps"\, arXiv:16 07.08744.\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Jed Pixl ey\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20160920T155425Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171121T160000 DTEND;TZID=America/New_York:20171121T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171121T160000 CREATED:20170809T180226Z DESCRIPTION:Brian Swingle\, UMD\n\nEinstein's Equations from Entanglement\n \n In recent years we have learned that the physics of quantum information plays a crucial role in the emergence of spacetime from microscopic degrees of freedom. I will review the idea that entanglement is the glue which hol ds spacetime together and show how Einstein's equations plausibly emerge fr om this perspective. One ubiquitous feature of these dynamical equations is the formation of black holes\, so I will conclude by discussing some new i deas about the nature of spacetime inside a black hole.\n LAST-MODIFIED:20171010T160835Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161024T190000Z DTEND:20161024T203000Z DTSTAMP:20260828T094430Z UID:chjpm3jbqep8eh236pqncp6eh0@google.com CREATED:20161010T153952Z DESCRIPTION:Speaker: Prof. Yuval Grossman\n\nSpeaker Institution: Cornell U niversity\n\nTitle: New Standard Physics at the LHC\n \nAbstract: We discus s two topics where one can use SM processes to\nlearn about QCD and then to use them as tools to probe physics beyond\nthe SM. We first discuss hadron ic $Z$ decays\, like $Z \\to \\J/\\psi\n\\gamma$ and then move to discuss w ays to measure $b$ and $c$\npolarization in high energy jets. LAST-MODIFIED:20161019T140253Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - New Standard Physics at the LHC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180306T150000Z DTEND:20180306T160000Z DTSTAMP:20260828T094430Z UID:46sk9sut7e3anr783c0rp5brpp@google.com CREATED:20180227T163626Z DESCRIPTION:

Speaker Name: \; \;Dr. Sungkun Hong

Speaker Institution: Vienna Center for Quantum Science and Technology\, University of Vienna

Title: \; \;Quantum meets M echanics: from Quantum Information to Fundamental Research

 \;Abstract: \;Studying quantum aspects of macroscopi c moving bodies is a new emerging field in quantum physics. The main experi mental approach is cavity optomechanics\, where photons in the cavity are u sed to measure and manipulate motional states of mechanical oscillators. Ca vity optomechanics\, together with advancements in microfabrication of mech anical devices\, has allowed us to observe and control mechanical resonator s at the quantum level. This opens new exciting possibilities for quantum i nformation science and for studying quantum physics in hitherto untested ma croscopic scales.

In this talk\, I will describe two different quantu m optomechanics experiments that I have been doing in Vienna. First\, I wil l present our progress in utilizing on-chip optomechanical devices as a new resource for quantum information. Using micro-fabricated silicon structure s\, we demonstrated the generation of quantum-correlated photon-phonon pair s\, the generation and retrieval of single phonons\, and the remote entangl ement between two mechanical modes\, paving the way for telecom-compatible optical quantum networks. Future directions of the work will also be discus sed. Next\, I will introduce a novel\, hybrid optomechanical system consist ing of optically levitated nanoparticles and micro-fabricated photonic crys tal cavity. The system combines ultra-high mechanical quality of the levita ted nanoparticle and strong optical transduction from the optical cavity. I t thus will allow for quantum coherent experiments on particle’s motions ev en at room temperature. I will discuss the current status of the experiment as well as future plans of the work\, particularly the matter-wave interfe rometry in an unexplored mass regime.

 \;

Bio: \;Sung

LAST-MODIFIED:20180227T164311Z LOCATION:Room 2460 A.V. Williams Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QTC Seminar - Faculty candidate Sungkun Hong TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160627T150000Z DTEND:20160627T160000Z DTSTAMP:20260828T094430Z UID:qepf2m545kcqru5jkc410b24pk@google.com CREATED:20160527T132853Z DESCRIPTION:Speaker Name: Richard Berkovits \n\nSpeaker Affiliation: Bar-Il an University\, Israel\n\nTitle: Entanglement Properties and Quantum Phase Transitions in Interacting Disordered One Dimensional Systems\n\nAbstract: Interacting disordered one-dimensional fermionic systems are an ideal test ground in order to investigate the interplay between properties of the enta nglement and quantum phase transitions. Although 1D systems with uncorrelat ed disorder are always localized\, they may exhibit a quantum phase transit ion to a metallic phase as function of disorder strength if the disorder is correlated (e.g.\, the Harper model). Once attractive interactions are con sidered\, a transition to a metallic/superconducting phase is predicted. Ev en for repulsive interactions a transition at higher temperatures/excitatio n energies to a metallic regime is predicted. This is the celebrated many-b ody localization (MBL) transition\, which has far reaching consequences on a wide range of subjects\, from quantum information to biological processes . We will argue that entanglement properties are an ideal tool to investiga te these phase transitions. We shall show that entanglement properties\, su ch as the typical entanglement entropy\, the statistics of the entanglement entropy\, the statistics of the entanglement spectrum\, are a powerful too l to characterize these phase transitions and may provide a way to characte rize unconventional regions of the phase space such as the non-ergodic regi on of the MBL phase diagram.\n LAST-MODIFIED:20160608T192848Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar - "Entanglement Properties and Quantum Phase T ransitions in Interacting Disordered One Dimensional Systems" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170203T171500Z DTEND:20170203T181500Z DTSTAMP:20260828T094430Z UID:lrfkuj4a297tc9ljgedng314sg@google.com CLASS:PUBLIC CREATED:20170125T144908Z DESCRIPTION:Speaker Name: Minh Tran\, QuICS\n\nTitle: Multipartite entangle ment detection with one random observable\n\nAbstract: We show that repeate dly measuring a many-body state in random local bases can detect entangleme nt. For pure states it is also asymptotically sufficient. In particular\, i f a state is sufficiently entangled\, measuring only one randomly chosen ob servable can reveal multipartite entanglement with high probability. We dem onstrate this feature with multipartite GHZ states and show that probabilit y of success increases with number of subsystems. Finally\, we discuss gene ralization from 2-level system to arbitrary dimension. \n\nPhys. Rev. A 92\ , 050301(R)(2015) \nPhys. Rev. A 94\, 042302 (2016)\n\n(lunch served at 12: 00pm) LAST-MODIFIED:20170125T144908Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171115T210000Z DTEND:20171115T223000Z DTSTAMP:20260828T094430Z UID:1qgb1i5lndt0o3gksutuvpqq5v@google.com CREATED:20171110T160302Z DESCRIPTION:Speaker Name: Caterina Vernieri\n\nSpeaker Institution : Fermil ab\n \nTitle : "Search for a Boosted Higgs Boson Produced via Gluon Fusion and Decaying to b Quarks"\n \nAbstract : Searches for the Higgs boson decay ing to a bottom quark-antiquark pair in the gluon fusion production mode wa s long considered impossible due to the overwhelming background from QCD mu ltijet production of bottom quarks. However\, we can access this process in the boosted topology\, in which the Higgs to bb system is reconstructed as a single\, large-radius jet. Jet substructure and dedicated b-tagging tech niques are used in the first search for boosted Higgs to bb at the LHC. The resulting experimental signature is a peak over a falling background in th e distribution of the invariant mass of the jet. The data-driven background estimation strategy and signal extraction is validated with Z to bb decays . The Z to bb process is observed with a local significance of 5.1 standard deviations for the first time in the single-jet topology. An excess of Hig gs to bb events above the expected background is observed with a local sign ificance of 1.5 standard deviations. LAST-MODIFIED:20171110T160302Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181003T173000Z DTEND:20181003T190000Z DTSTAMP:20260828T094430Z UID:66v64i6o2lp4es2b2or7na78uo@google.com CREATED:20180904T135443Z DESCRIPTION:\nTitle: "The Belle II Experiment at KEK"\n\nSpeaker Name: Leo Piilonen\, Virginia Tech. and BELLE-II\n\nAbstract : I describe the second -generation B-factory detector\, Belle II\, and accelerator\, SuperKEKB\, t hat have started operating at the KEK laboratory in Japan. I will present t he status of the experiment\, including early physics results from the Phas e 2 run in 2018\, and prospects for the Phase 3 run in 2019.\n\nSeminar wil l be preceded by lunch at 12:00 pm on 3rd floor PSC. The talk is from 1:30 to 3:00 pm. Please note location for talk is on the second floor. Times are tentative. LAST-MODIFIED:20180914T132136Z LOCATION:PSC room 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Joint UMD/JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161117T203000Z DTEND:20161117T213000Z DTSTAMP:20260828T094430Z UID:gl8muu47dhigjvqngq7ng127h8@google.com CREATED:20161109T211127Z DESCRIPTION:Speaker: Charles Doran (Alberta and UMd) LAST-MODIFIED:20161109T211127Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mirror symmetry for Riemann surfaces (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171218T160000Z DTEND:20171218T170000Z DTSTAMP:20260828T094430Z UID:6ofcq8kjjdc6q275h51h1oti5o@google.com CLASS:PUBLIC CREATED:20171204T121557Z DESCRIPTION:Speaker: Guido Pupillo\nInstitution: University of Strasbourg\n \nCavity-enhanced transport of charge\n\nStrong light-matter interactions a re increasingly used to understand and engineer new states of matter in the fields of quantum optics\, solid state physics and material science. An em erging topic is the modification of electron transport using external elect ro-magnetic radiation. In this talk we present results from recent experime nts [1] and a proof-of-principle model [2] for the enhancement of charge co nductivity in molecular semi-conductors due to the coupling of intra-molecu lar electronic transitions to the bosonic field of a cavity or of a plasmon ic structure prepared in its vacuum state. Light-matter hybridization resul ts in dressed fermionic bands that can provide an enhancement of charge con ductivity at room temperature and in the steady-state. We discuss a few ope n questions and opportunities for vacuum-based quantum science and technolo gy.\n\n \n[1] "Conductivity in organic semiconductors hybridized with the v acuum field"\, E. Orgiu et al.\, Nature Materials 14\, 1123-1129 (2015) \n [2] "Cavity-enhanced transport of charge"\, D. Hagenmuller\, J. Schachenmay er\, S. Schutz\, C. Genes\, and G. Pupillo\, Phys. Rev. Lett. 119\, 223601 (2017) LAST-MODIFIED:20171204T121557Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170315T190000Z DTEND:20170315T200000Z DTSTAMP:20260828T094430Z UID:ha68i5adolo8fn5ev6i6sksht0@google.com CREATED:20170309T182456Z DESCRIPTION:Speaker Name: Dr. Daniel R. Hines\n\nSpeaker Institution : Labo ratory for Physical Sciences\, College Park\, MD\n\nTitle : Additive Manufa cturing Methods and the Fabrication of Electronic Circuits\n\nAbstract : Ad ditive manufacturing (AM) (also known as 3-D digital printing technologies or more colloquially as 3D-printing) is an emerging manufacturing method wh ich allows for the design and fabrication of complex structures not otherwi se achievable using standard (subtractive) manufacturing methods. In the pa st\, additive manufacturing methods have been utilized primarily in the are a of structural prototyping\, for example\, in automotive and aviation indu stries. Further advances in AM are bringing the fabrication of electronics into the realm of 3D printing. Such additive manufacturing methods for the fabrication of electronics are expected to greatly advance the design of bo th printed hybrid electronics (PHE) and flexible hybrid electronics (FHE)\, which are predicated on the expectation that advanced electronic circuits will be constructed such that new form factors can be obtained. For PHE thi s would be in the form of conformable/embedded electronics\, while for FHE this would be fully flexible electronics. For example\, advanced electronic s would do away with the ubiquitous Cu/FR4 flat\, rigid printed circuit boa rds (PCBs) generally found in present-day computers and other electronics d evices and fabricate the electronics into a part itself. Examples of such a dvanced electronics would be a smart electronic bandage for the health care industry or an impact sensor and/or communication electronics built into t he shell of a sports helmet. Such electronics are expected to require the a bility to mount and electrically connect components comprised of different materials and thicknesses (i.e. embedded/integrated components rather than surface-mounted components that are traditionally attached as the last step in fabrication) during the fabrication of a desired circuit (however\, the further ability to thin components in order to achieve true flexibility ma y be needed for FHE). As additive manufacturing methods continue to mature and functional ink materials become more prevalent\, new opportunities for the fabrication of electronic circuits are being developed. Several example s of employing additive manufacturing methods for the fabrication of advanc ed electronics circuits will be presented during this talk. LAST-MODIFIED:20170309T182823Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170302T173000Z DTEND:20170302T183000Z DTSTAMP:20260828T094430Z UID:3m3k4brf9rkk8or9h4o37s2vd8@google.com CREATED:20170227T171751Z DESCRIPTION:TITLE: Eikonal Methods and Non-Paraxial Vector Solutions for Fo cused Radiation\n*PHYS 798E and ENEE 698D: Problems in Advanced Physics\; E lectrophysics\n\nSpeaker: Dr. Daniel Gordon\, Naval Research Laboratory\, P lasma Physics Division\n\nABSTRACT: The eikonal approximation can be used t o describe radiation fields when feature sizes are much larger than a wavel ength. Ray tracing can be viewed as a solution technique for the eikonal w ave equation\, which yields phase and amplitude information. Unlike paraxi al methods\, eikonal methods make no assumption regarding the directional c ontent of the wavenumber spectrum\, which is an important requirement for c orrect treatment of tightly focused radiation\, and for characterizing sphe rical aberrations in an optical system. On the other hand\, ray tracing su ffers from catastrophic failure in the region of a caustic\, which is often precisely the region of interest. We will discuss an efficient method for matching eikonal fields with exact solutions of Maxwell’s equations in the caustic region. This method may be used to compute the non-paraxial vecto r fields produced at the focus of a realistic optical system\, or to develo p a theory of non-paraxial Gaussian beams. NRL is developing a new eikonal wave code “SeaRay” which utilizes these techniques.\n\nBio. Dr. Daniel Gor don received the Ph.D. in electrical engineering from the University of Cal ifornia\, Los Angeles in 1999. He has been with the Plasma Physics Divisio n at the Naval Research Laboratory\, in various capacities\, since graduati ng. He is currently the head of the Laser Physics Section in the Beam Phys ics Branch. He has worked on experiments with various ultra-intense laser systems\, including the Mars/Neptune laser at UCLA\, the Vulcan laser at Ru therford-Appleton Laboratories\, and the TFL laser at NRL. He has been inv olved with recent experiments and simulations on laser acceleration of elec trons and protons at NRL and Brookhaven National Laboratory\, and is curren tly leading an effort to construct a terawatt class carbon dioxide laser fo r AFRL. His interests include laser-plasma interaction\, strong-field phys ics of atoms\, hydrodynamics\, radiation generation\, and numerical simulat ion\n LAST-MODIFIED:20170227T171751Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170308T150000Z DTEND:20170308T160000Z DTSTAMP:20260828T094430Z UID:9lvklvi4uroflghdi9g34am3bg@google.com CREATED:20170303T141020Z DESCRIPTION:Speaker: Cosmic Raj \n\nSpeaker Affiliation: University of Toky o\, Nakamura group\, \n\nTitle: Josephson Junction Arrays in Circuit QED Ar chitecture\n\nAbstract: Understanding and engineering of quantum many-body systems is a big challenge in quantum physics and quantum information proce ssing. Studies in artificial quantum many-body systems with well-controlled parameters should play a central role for that purpose. One of the promisi ng platforms for realizing an artificial quantum many-body system is a Jose phson junction array (JJA). It consists of an array of superconducting isla nds connected by small Josephson junctions\, where various kinds of classic al and quantum Hamiltonians (such as Bose-Hubbard\, XY Hamiltonians) can be implemented depending on parameters of the system. Here\, we will present our recent progress of experimental study of JJAs using the circuit quantum electrodynamics (cQED) architecture. In contrast to the conventional trans port measurements in JJAs\, the cQED approach has some advantages: The syst em is weakly perturbed by the microwave excitation and properties of not on ly ground state but excited states are investigated at single photon level. In this talk\, we particularly focus on our investigations of JJA in a mag netic field\, and present some preliminary results of vortex lattice meltin g process.\n\nCosmic will be visiting UMD Wed-Fri. Please contact Jake Tayl or if you’d like to meet with him during his trip. LAST-MODIFIED:20170303T141051Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161207T160000Z DTEND:20161207T223000Z DTSTAMP:20260828T094430Z UID:oamf58il38innshp7t79tt7f00@google.com CREATED:20160906T221907Z DESCRIPTION:December 7 (Wednesday)\nSpin Quantum Computation\n11:00 AMRober t Throckmorton\, "Quantum fidelity in electron spin-based semiconductor two -qubit exchange gates"\n11:45 AMYang Song\, "Validity of the rotating-wave approximation in semiconductor qubit systems and fast gate control beyond t he RWA"\n12:30 Break\nWeyl Semimetals and Topological Insulators\n1:30 PMPa llab Goswami\, "Non-Fermi liquid phases of topological semimetals"\n2:15 PM Mehdi Kargarian\, "Amperean and time-reversal-symmetry-breaking superconduc ting states in spin-orbit coupled electron systems"\n3:00 PMJed Pixley\, "A voided quantum criticality and single particle excitations in weakly disord ered Weyl semimetals"\n3:45 Break\nMany Body Localization\n4:00 PMYang-Le W u\, "Understanding analog quantum simulation dynamics in coupled ion-trap q ubits"\n4:45PMXiao Li\, "Exploring non-ergodicity with atoms in an incommen surate optical super-lattice"\n LAST-MODIFIED:20161201T163633Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 1 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171122T160000Z DTEND:20171122T170000Z DTSTAMP:20260828T094430Z UID:1ijepbn748291v8n059lhmsfpc@google.com CREATED:20171116T164414Z LAST-MODIFIED:20171116T164454Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160919T203000Z DTEND:20160919T213000Z DTSTAMP:20260828T094430Z UID:8n3gaudqrpea203m5mjk00jv3c@google.com CREATED:20160908T135558Z DESCRIPTION:Speaker Name: Muhammad Sarfraz\n\nSpeaker Institution : Governm ent College (GC) University\, Lahore\, Pakistan\n\nTitle : On Quasilinear K inetic Model of Electromagnetic Electron Cyclotron and Electron Firehose In stabilities in Homogeneous and Inhomogeneous Solar Wind Plasmas\n\nNotes: C offee\, Tea & Snacks 4:15-4:30 PM\n\nAbstract : In solar wind plasma\, char acterized by temperature anisotropies of protons\, alpha particles and elec trons\, different microinstabilities are known to be responsible for regula ting the upper bounds of their respective temperatures. In our present work \, a macroscopic quasilinear approach along with standard methodology of ki netic fluid modeling adopted to investigate the details of excitation\, dam ping and saturation of electron temperature anisotropy-driven electromagnet ic electron cyclotron (EMEC) and electron firehose (EFH) instabilities in h omogeneous and in inhomogeneous (density and magnetic field profiles) solar wind plasmas. We constructed a closing set of self-consistent quasilinear equations constituting the particle kinetic\, wave energy density and linea rized Vlasov equations with the aid of single electrons component and halo component bi-Maxwellian model distributions. In our present technique\, the solutions of kinetic equations inherently contain the so-called anisotropy -beta inverse relationship such that the empirical fitting is automatically reproduced at the end of each quasilinear calculation. Nevertheless\, the empirical formula\, which is built from consideration of linear analysis\, cannot predict the timescale of instability saturation or the asymptotic wa ve energy density. Such an approach amounts to global-kinetic solar wind mo deling suggested in the literature\, and to reproduce the so-called "Bale" diagram. LAST-MODIFIED:20160908T140320Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170925T190000Z DTEND:20170925T203000Z DTSTAMP:20260828T094430Z UID:3e27ufp62sf60i3s0a34h39fpd@google.com CREATED:20170920T131806Z DESCRIPTION:Speaker: Prof. Peisi Huang\n\nSpeaker Institution: University o f Nebraska-Lincoln\n\nTitle: Double Higgs at the LHC\n \nAbstract: In this talk\, I will discuss how to probe new physics through double Higgs process at the LHC. In the first part\, I will show that there is a strong correla tion between the Higgs trilinear coupling and the nature of EWPT. Then I wi ll discuss how to probe those non-SM values of the trilinear coupling by ma king use of the modifications in the invariant mass distribution. In the se cond part\, I will show the possible modifications to the double Higgs prod uction in the presence of a light stop and a modified top coupling. Becaus e of the destructive interference of the triangle and the box diagram ampli tude contributions to the double Higgs production\, even a small modificati on in the top Yukawa coupling can lead to a significant increase of the dou ble Higgs production rate. LAST-MODIFIED:20170920T131806Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170512T170000Z DTEND:20170512T183000Z DTSTAMP:20260828T094430Z UID:fsiov0lm5htc4g2pcmg5cm9msk@google.com CREATED:20170425T162821Z DESCRIPTION:Speaker: Sebastian Ohmer\n\nSpeaker Institution: Max Planck Ins titute\n\nTitle: Local Baryon Number and Unification\n \nAbstract: We discu ss extensions of the Standard Model of particle physics where baryon number is promoted to a local symmetry. We investigate the dark matter and collid er phenomenology of the minimal models. Further\, we focus on the embedding of local baryon number in non-Abelian gauge symmetries. We present a model based on SU(4)_C x SU(3)_L x SU(3)_R which can be realized at low scales a nd tested at the Large Hadron Collider (LHC) with exotic signatures such as stable fractional charged particles and R-hadrons. LAST-MODIFIED:20170425T162822Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161116T200000Z DTEND:20161116T210000Z DTSTAMP:20260828T094430Z UID:78apl1jaa4ra55qkfvd9pil5ec@google.com CREATED:20161114T185253Z DESCRIPTION:Speaker Name: Prof. Michael Zachariah\n\nSpeaker Institution : Chemical Engineering and Chemistry\, University of Maryland\n\nTitle: Pro bing Fast High Temperature Transformation in Nanoparticles for Energetic Ma terials\n\nAbstract : The high temperature reactivity of metal/metal oxides is important in a wide variety of industrial applications including solar- thermal hydrogen generation\, CO2 sequestering\, chemical-looping combustio n\, and energetic materials\, among others. In this seminar I will discuss probing the reactivity of nanometals and metal oxides\, towards developing a conceptual picture of rate limiting and phenomenological processes\, in p articular for application to energetic materials. This discussion will natu rally lead to what makes nanoscale materials attractive for these applicati ons\, as well as some of their limitations.\n LAST-MODIFIED:20161114T185439Z LOCATION: LPS Seminar Room SEQUENCE:3 STATUS:CONFIRMED SUMMARY:LPS Seminar - Probing Fast High Temperature Transformation in Nanop articles for Energetic Materials TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160908T193000Z DTEND:20160908T203000Z DTSTAMP:20260828T094430Z UID:d9b5u4h5aiqik37c1tmt3gq9v4@google.com CREATED:20160906T194804Z DESCRIPTION:Speaker: Siddhartha Harmalkar (UMD)\n LAST-MODIFIED:20160906T194804Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to elliptic curves TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161221T203000Z DTEND:20161221T213000Z DTSTAMP:20260828T094430Z UID:7g9n25jd62817lnpodc6ojrk0k@google.com CREATED:20161221T142116Z DESCRIPTION: http://youtube.com/user/cmnsumd LAST-MODIFIED:20161221T142116Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMNS commencement livestream TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161221T150000Z DTEND:20161221T160000Z DTSTAMP:20260828T094430Z UID:org2joclherjekoteh89fe07mc@google.com CREATED:20161220T134720Z DESCRIPTION:Speaker: Dan Carney\n\nAffiliation: University of British Colum bia\n\nTitle: Scattering and quantum information\n\nAbstract: In high energ y and gravitational physics\, the S-matrix is the starting point for studyi ng any fundamental physics in asymptotically flat spacetimes. In the contex t of information theory\, the S-matrix can be viewed simply as one of many possible unitary time evolution operators. I'll give some simple examples h ighlighting the overlap of these views\; in particular\, I will discuss the interplay of entanglement with relativistic scattering.\n LAST-MODIFIED:20161220T143556Z LOCATION:3100A Atlantic Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171019T200000Z DTEND:20171019T213000Z DTSTAMP:20260828T094430Z UID:1464jho54qlmhabfuuc6737n9k@google.com CREATED:20171013T151056Z DESCRIPTION:"The Vicissitudes of Dark Matter at the LHC"\nSpeaker Name: Phi lip Harris\nSpeaker Institution : MIT\n\nAbstract : Developments over the p ast year have demonstrated the power of the LHC to compliment and\, in some cases\, extend direct detection and galactic searches for dark matter. We present a series of new searches for dark matter that represents the culmin ation of these developments. In addition to an order of magnitude improveme nt in sensitivity to dark matter\, we discuss the impact of these searches on our understanding of electroweak boson production. Finally\, we explore the future of dark matter searches. We consider a new class of searches usi ng hadronically decaying bosons discussing new and we discuss the future im plications on dark matter and\, more broadly\, hidden sectors. Can we make a definitive path to dark matter discovery?\n\nsmegonig@umd.edu\n LAST-MODIFIED:20171013T151056Z LOCATION: PSC room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170403T200000Z DTEND:20170403T213000Z DTSTAMP:20260828T094430Z UID:tvj89b67ajkip37e1g3kreclmk@google.com CREATED:20170315T130816Z DESCRIPTION:Speaker: Yonatan Kahn\n\nSpeaker Insitution: Princeton Universi ty\n\nTitle: New searches for sub-GeV dark matter\n\nAbstract: The paradigm of weak-scale WIMP dark matter is under pressure from numerous experimenta l efforts. Zooming out on the possible mass scales\, I will discuss two new experimental proposals to search for light (MeV) and ultralight (sub-eV) d ark matter. MeV-scale dark matter can eject electrons from a two-dimensiona l material such as graphene\, and the kinematics of these electrons correla te strongly with the dark matter velocity\, allowing directional detection. Sub-eV dark matter behaves as a coherent field\, and axion-like pseudoscal ar dark matter coupling to photons sources small oscillating magnetic field s in the presence of a static external B-field. I will describe progress to wards experimental realizations of these proposals with PTOLEMY at Princeto n and ABRACADABRA at MIT. LAST-MODIFIED:20170315T130816Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180215T160000Z DTEND:20180215T170000Z DTSTAMP:20260828T094430Z UID:71d2ra1ilf57pbf24fto3hun2c@google.com CREATED:20180212T182048Z DESCRIPTION:Speaker Name: Hannes Bernien\n\nSpeaker Institution: Harvard\n\ nTitle: Quantum LEGOs: Building large quantum systems atom-by- atom\n\nAbst ract: The realization of large-scale controlled quantum systems is an excit ing frontier in modern physical science. In this talk\, I will introduce a new approach based on cold atoms in arrays of optical tweezers. We use atom -by- atom assembly to deterministically prepare arrays of individually cont rolled cold atoms. A measurement and feedback procedure eliminates the entr opy associated with \nthe probabilistic trap loading and results in defect- free arrays of over 60 atoms [1]. Strong\, coherent interactions are enable d by coupling to atomic Rydberg states. We realize a programmable Ising-typ e quantum spin model with tunable interactions and system sizes of up to 51 qubits. Within this model we observe transitions into ordered states (Rydb erg crystals) that break various discrete symmetries\, verify high-fidelity preparation of ordered states\, and investigate dynamics across the phase transition in large arrays of atoms [2]. An alternative\, hybrid approach f or engineering interactions is the coupling of \natoms to nanophotonic stru ctures in which guided photons mediate interactions between atoms. I will d iscuss our progress towards entangling two atoms that are coupled to a phot onic crystal cavity and I will outline the exciting prospects of this appro ach for scaling the system to large distances in a quantum network. \n[1] S cience 354\, 1024 (2016) \n[2] Nature 551\, 579 (2017) LAST-MODIFIED:20180212T211416Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180202T210000Z DTEND:20180202T220000Z DTSTAMP:20260828T094430Z UID:5v93cdm7enmp2jmm2c348rl24e@google.com CREATED:20180124T173723Z DESCRIPTION:Speaker: Will Cole

Speaker Affiliation: CMTC and JQI

Title: Exotic quantum criticality in interacting\, spin-orbit coupled b osons

Abstract: Spin-orbit coupled Bose liquids provide an experimen tally viable realization of quantum criticality in itinerant magnets. I wil l describe our recent theoretical work on this system\, where we derive an effective field theory near the transition\, which is essentially an acoust ic phonon with a “gauge” coupling to an Ising field. The order parameter fo r the transition describes a broken Z2 spin symmetry\, but the associated p hase is qualitatively distinct from the Ising phase as it is accompanied by a nonzero momentum density which is generated by the gauge fluctuations at the transition. Having identified the appropriate effective field theory\, we validate theory predictions with extensive numerical simulations (DMRG) of the microscopic Hamiltonian and extract the universal critical exponent s.

Notes: \; There will be snacks and drinks at \;4:00 \;and the talk will start at \;4:10 LAST-MODIFIED:20180124T174306Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170501T200000Z DTEND:20170501T213000Z DTSTAMP:20260828T094430Z UID:g5hvk23njuuvkrfb15c6v6s3vc@google.com CREATED:20170425T162643Z DESCRIPTION:Speaker: Andrea Thamm\n\nSpeaker Institution: Johannes-Gutenber g Universität Mainz\n\nTitle: Collider Probes of Axion-Like Particles\n \nA bstract: I will show that the study of rare Higgs decays in the high-lumino sity run of the LHC can probe axions and axion-like particles (ALPs) in a w ide range of parameter space\, which is otherwise inaccessible to experimen tal searches. If the ALP decays predominantly into photons\, our strategy c overs the current “gap” in the mass range between 1 MeV and 60 GeV down to a photon-axion coupling as small as 10−6/TeV. An ALP in this parameter rang e can explain the anomalous magnetic moment of the muon and is consistent w ith electroweak precisions tests. In our analysis we consider the most gene ral effective Lagrangian for a spin-0 particle protected by a shift symmetr y\, motivated by many extensions of the Standard Model with a spontaneously broken global symmetry. LAST-MODIFIED:20170425T162643Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171108T203000Z DTEND:20171108T213000Z DTSTAMP:20260828T094430Z UID:3ipa33djbhbub1rb3n93pb1t03@google.com CREATED:20171102T152959Z DESCRIPTION:Speaker Name: Dr. Albert Mollen\n\nSpeaker Institution: Max P lanck Institute for Plasma Physics\, Greifswald\n\nTitle: Collisional tran sport in stellarator plasmas\n\nAbstract: In contrast to tokamaks where tu rbulence typically dominates\, a substantial fraction of the radial energy and particle transport in stellarators can often be attributed to collision al processes. One of the main objectives of the new Wendelstein 7-X stellar ator (start of operation December 2015) is to demonstrate that stellarators can be sufficiently well optimized for small collisional transport levels\ , thus making the concept a realistic candidate for a future fusion reactor . The kinetic calculation of collisional transport has for a long time reli ed on simplified models which use mono- approximation\, the simple pitch-an gle scattering collision operator and are radially local. But not all exper imental observations have been satisfactorily explained\, and in recent yea rs more advanced numerical tools have appeared which relax some of the appr oximations. We will discuss how the field has advanced and what the open qu estions are. LAST-MODIFIED:20171102T153151Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T200000Z DTEND:20180316T204000Z DTSTAMP:20260828T094430Z UID:47s9r2qqcj9jndp5ocivluoda3@google.com CREATED:20180208T165435Z DESCRIPTION:Speaker: Kevin Landsman\n\nAffiliation: JQI\n\nTitle: Measureme nt of Quantum Scrambling with Trapped Ions\n\nAbstract: Trapped ion crystal s are a promising technology for building large-scale quantum computers\, w hich may be able to simulate inaccessible physical systems like black holes . Quantum scrambling occurs when local information disperses into quantum m any-body correlations and describes an interpretation of the black hole inf ormation problem. Out-of-time-ordered correlation functions (OTOCs) have re cently emerged as a way to directly measure quantum scrambling. In the pres ence of quantum scrambling\, an OTOC will decay to 0\, but decoherence and imperfect Hamiltonian evolution errors will also cause the OTOC to decay to 0\, underlying the problems inherent in such a measurement. Here\, we impl ement a quantum teleportation scheme that simultaneously measures an OTOC w hile projecting the presence of scrambling onto the teleportation fidelity. The scrambling operation is realized by a three-qubit quantum gate. Measur ed teleportation fidelities are typically $78\\%$\, which act as a bound fo r the ''true" scrambling-induced decay of the OTOC.\n\nNote: There will be snacks and drinks at 4:00 and the talk is from 4:10 to 4:40 in CSS 3100A\n( Please note change from last week's announcement email and change in venue! ) LAST-MODIFIED:20180315T140544Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170329T200000Z DTEND:20170329T210000Z DTSTAMP:20260828T094430Z UID:p64vc86ntoe02mefvrl6fa5p54@google.com CREATED:20170313T142113Z DESCRIPTION:Speaker Name: Eric Shi\n\nSpeaker Institution : Princeton Unive rsity\n\nTitle : Gyrokinetic continuum simulations of turbulence in open-fi eld-line plasmas\n\nAbstract : The scrape off layer (SOL) of a tokamak is a n edge region in which plasma flows freely along open magnetic field lines towards a material surface\, where plasma losses are mediated by a Debye sh eath. It is important to develop numerical codes to study the SOL because a n accurate prediction for the SOL heat-flux-channel width in ITER is necess ary to address major concerns regarding damage to plasma-facing components by the exhaust power. While the use of sophisticated gyrokinetic particle-i n-cell and continuum codes for studies in the tokamak core region has becom e widespread\, major code extensions or new codes are required to handle th e additional challenges of the edge region. In this talk\, I will present r esults from my thesis work on developing a gyrokinetic continuum code for t he simulation of plasma turbulence in a model SOL. I will discuss details a bout our numerical approach\, which is based on discontinuous Galerkin meth ods\, and gyrokinetic sheath model boundary conditions. I will show results from our simulations of turbulence in the Large Plasma Device at UCLA\, in cluding the suppression of turbulence by applied flow shear\, and results f rom our recent work in modeling a NSTX-like SOL to investigate turbulent he at-flux spreading.\n LAST-MODIFIED:20170313T142225Z LOCATION: ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171019T123000 DTEND;TZID=America/New_York:20171019T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20171019T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nPhillip Sprangle\nUniversity of Maryland | Department of Electrical and Computer Engineering / Department of Physics\nTitle: Ult ra-High Intensity Laser Physics and Applications\nAbstract: This talk will cover ultra-high field physics phenomena and interactions associated with h igh intensity short pulse lasers. The operating parameter regime of these lasers covers a wide range\, e.g.\, peak powers of ~ 1012 - 1015 W\, pulse lengths of ~ 10-12 – 10-14 sec\, and intensities of ~ 1014 - 1023 W/cm2. T hese lasers are used in high-field physics research and have a number of un ique applications. The physical processes associated with USPL interaction s and propagation include: photo ionization\, Kerr and Raman effects\, self -phase modulation\, optical and plasma filamentation\, optical shocks\, fre quency chirping\, propagation through atmospheric turbulence\, etc. This t alk will discuss these interrelated physical processes and some unique appl ications\, such as: laser driven acceleration\, UV/X-ray generation\, under water acoustic sources\, atmospheric spark formation\, detection of radioac tive materials and atmospheric lasing. LAST-MODIFIED:20170911T175934Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180402T203000Z DTEND:20180402T213000Z DTSTAMP:20260828T094430Z UID:4vtaj4evacrt2jhk61b2g3fhuv@google.com CREATED:20180312T211411Z DESCRIPTION:Description:

Speaker Name: Haihong C he

Speaker Institution: NASA Goddard Space Flight Center and Departm ent of Astronomy\, University of Maryland

Abstract: Electron beams accelerated by solar flares and nanoflares are believed to be respons ible for several types of solar radio bursts observed in the corona and int erplanetary medium\, including flare-associated coronal Type U and J and in terplanetary Type III radio bursts\, and nanoflare-associated weak coronal type III bursts. The coherent radio emission is a powerful probe of the pla sma environment of solar corona and the mechanism of acceleration and energ etic particle propagation. The characteristic of the radio bursts is their drifting frequency being consistent with the local electron plasma frequenc y. However\, how electron two-stream instability driven by electron beams p roduces coherent emission with a duration of several orders of magnitude lo nger than the linear saturation time is a long-standing puzzle. I will revi ew the essential problems associated with the observations of radio bursts and present a new mechanism proposed by Che et al. [2017\, doi: 10.1073/pna s.1614055114]. This new mechanism shows that the continuous plasma coherent emission can be maintained by cyclic Langmuir collapse and the associated waves and spatial coherent structures can be tested by space probes such as Wind\, ACE\, the near-future Parker Solar Probe and Solar Orbiter. Also\, electron beams are commonly discovered in the magnetosp here associated with magnetic reconnection and shock waves. The high spatia l and time resolution field and particle data from the newly launched MMS provide possible in-situ observation s to test the emission process near the acceleration source region. I will also discuss the open questions in the current theoretical study and observ ations.

Notes: \;Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20180312T211819Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180420T170000Z DTEND:20180420T180000Z DTSTAMP:20260828T094430Z UID:51dn1fvkl08sbg6no4cn7le705@google.com CREATED:20180410T132600Z DESCRIPTION:Speaker: Meilin Liu\, Professor and Associate Chair\, Materials Science and Engineering Georgia Institute of Technology

Title: Surf ace Modification and In Situ/Operando Characterization of Electrodes for En ergy Storage and Conversion

Abstract: \;The performances o f electrochemical systems are often limited by the charge and mass transfer along surfaces and across interfaces - the most active sites for chemical and electrochemical reactions. \; Fundamental understanding of the rate -limiting steps is vital to achieving rational design of novel electrode ma terials or structures with enhanced energy and power density. This presenta tion will highlight some recent advances in surface modifications and chara cterization of electrodes in energy storage and conversion systems. Surface enhanced Raman spectroscopy (SERS) has been used for probing and mapping n ew phases and reaction intermediates on electrode surfaces under or near op erating conditions. In particular\, it is demonstrated that SiO 2 \;shell isolated Ag nanoparticles have excellent chemical and thermal robustness and stability for \;in situ \;SERS study of electrode materials under \;in situ \;or \;operando \;conditions\, providing valuable information on reaction intermediates or structural chan ges that critically influence the performance and stability of the electrod es. Further\, synchrotron-based X-ray absorption spectroscopy (XAS) and XPS has been used to characterize the local atomistic structure variation and oxidation state changes of electrode surfaces and interfaces\, which may cr itically affect the activation or degradation processes of electrodes.  \; These experimental studies\, together with modeling and simulation\, hav e helped us to gain important insights into the mechanisms of chemical and energy transformation\, electro-catalytic reactions\, and degradation proce sses\, providing valuable guidelines for rational design of new electrode m aterials\, surfaces\, and interfaces with desired functionalities. LAST-MODIFIED:20180412T201739Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180504T170000Z DTEND:20180504T180000Z DTSTAMP:20260828T094430Z UID:7rrrq0tfq7mkjj8hert45i53ti@google.com CREATED:20180417T140134Z DESCRIPTION:Speaker: Michele Marcolongo\, MSE Professor and Dept. Head\, Drexel University

Title: Molecularly Engineering Soft and Co nnective Tissue Using Biomimetic Proteoglycans

Abstrac t: \;We have designed\, synthesized and characterized biomime tic proteoglycans which mimic the three-dimensional bottle brush architectu re of natural proteoglycans using a hybrid natural/synthetic polymer approa ch composed of natural glycosaminoglycan (chondroitin sulfate\, CS) bristle s attached end-on to a synthetic polymer core (poly(acrylic acid)). \; We have made a family of biomimetic proteoglycans of varying sizes from mim icking decorin to aggrecan in size and bristle density (aggrecan-like or ve rsican-like\, for example). \; Using biomimetic proteoglycans\, we have molecularly engineered tissues which have been depleted of the mechanical and hydration physical properties through loss of proteoglycans and glycosa minoglycans including cartilage and the urethra \;ex vivo \;and \;in vivo. \; The molecule s have additional potential in tissue engineering and drug delivery in addi tion to the mechanical and hydrating effects. LAST-MODIFIED:20180417T140148Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180504T200000Z DTEND:20180504T204000Z DTSTAMP:20260828T094430Z UID:5rc99442ldc5s67v9qvaljitnm@google.com CREATED:20180425T153619Z DESCRIPTION:Speaker Name: Cinthia Huerta Alderete\n\nSpeaker Institution: I nstituto Nacional de Astrofísica\, Óptica y Electrónica\, INAOE\, Mexico.\n \nTitle: Quantum simulation of para-particles\n\nAbstract: Quantum simulati ons provide a testbed to study a broad range of problems in physics\, chemi stry\, and biology. We propose an ion trap scheme to quantum simulate a par a-particle oscillator of even order. Our quantum simulation starts from the cross-cavity quantum Rabi model. Resonant fields and homogeneous coupling constants allow us to recover an effective Hamiltonian where the first (sec ond) boson field mode couples to the two-level system under (anti-)Jaynes-C ummings dynamics\, that can be map into a driven para-Bose oscillator of ev en order. On the other hand\, if both field modes couple to the two-level s ystem under Jaynes-Cummings dynamics\, we can make an analogy with para-Fer mi oscillators\, also of even order. These simulations might shed light on the quantum state engineering of separable and entangled bichromatic field modes. \n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180425T153619Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170602T150000Z DTEND:20170602T161500Z DTSTAMP:20260828T094430Z UID:ldlliejdpiiubv9tjf9gna0s8o@google.com CREATED:20170502T120419Z DESCRIPTION:Speaker: Xin (Sunny) Wang\n\nAffiliation: City University of Ho ng Kong\n\nTitle: On the advantage of barrier over tilt control of a single t-triplet spin qubit\n\nAbstract: Overcoming the charge noise is key to the realization of scalable quantum computation using spin qubits. It has been recently demonstrated that the effects of charge noise can be suppressed i f operations of a singlet-triplet qubit are implemented using barrier contr ol instead of the traditional tilt control. We have found\, however\, that for certain gates involving extensive x-rotations\, barrier control offers little or no improvement when the nuclear noise is significant. Nevertheles s\, we introduce a new set of composite pulses that reduce gate times by up to 90%. Using these optimized pulses\, the barrier control shows great adv antages in randomized benchmarking simulations\, with the coherence time ex tended by about two orders of magnitude for experimentally relevant noises [1]. We have also performed a microscopic calculation of a singlet-triplet qubit under the influence of an impurity. We have found that\, the relative charge noise (charge noise divided by the exchange interaction)\, while ge nerally believed to increase with increasing exchange interaction\, actuall y decreases when the barrier control is implemented [2]. This is understood as a combined consequence of the greatly suppressed detuning noise when th e two dots are symmetrically operated\, as well as an enhancement of the in ter-dot hopping energy of an electron when the barrier is lowered.\n\nRefer ences\n[1] C. Zhang\, R.E. Throckmorton\, X.-C. Yang\, X. Wang\, E. Barnes\ , S. Das Sarma\, arXiv:1701.03796 (Phys. Rev. Lett. in press)\n[2] X.-C. Ya ng\, X. Wang\, arXiv:1704.07975\n\nLocation: 2205 John S. Toll Physics Buil ding\n\nHost: Robert Throckmorton\n\nhttp://www.physics.umd.edu/cmtc/semina rs.html LAST-MODIFIED:20170511T190442Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170911T110000 DTEND;TZID=America/New_York:20170911T120000 RRULE:FREQ=WEEKLY;UNTIL=20171212T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20171002T110000 EXDATE;TZID=America/New_York:20171009T110000 EXDATE;TZID=America/New_York:20171120T110000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: \nTitle: TBA\nAbstract: TBA LAST-MODIFIED:20170906T143653Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181004T180000Z DTEND:20181004T193000Z DTSTAMP:20260828T094430Z UID:6i6f0cv5nck0rlss5olu0u3l7h@google.com CREATED:20180823T193120Z DESCRIPTION:\nTitle: Topological Semimetals from a High Magnetic Fields Per spective\n\nSpeaker: Luis Balicas\, National High Magnetic Field Laboratory and Physics Department\, Florida State University\n\nAbstract: \nTopologic al semimetals such as Weyl and Dirac systems are three-dimensional phases o f matter characterized by topology and symmetry protected gapless electroni c excitations. These three-dimensional analogs of graphene have generated a lot of interest recently given that their quasiparticles display connectio ns with particle physics models for relativistic and chiral fermions. Their unconventional electronic structures are predicted to lead to protected su rface states and to unconventional responses to applied electric and magnet ic fields. In the past few years\, we have studied a few of these compounds [1-8] under high magnetic fields\, with the goal of i) extracting their el ectronic structure at the Fermi level in order to ii) compare it with theor etical predictions\, and of iii) exposing their transport properties which are expected to be unconventional due to their “topological” character. Qua ntum oscillatory phenomena\, such as the de Haas van Alphen-effect (dHvA)\, provide information about their electronic structure and have a higher ene rgy resolution when compared to angle resolved photoemission spectroscopy ( ARPES)\, which insofar has been the technique of choice for studying these compounds. Here\, we will provide a (very) brief introduction to associated concepts and discuss the specific case of γ-MoTe2 which is a candidate for the so-called Weyl type-II semimetallic state [5]. Although a number of AR PES based publications claim an excellent agreement with the theoretical pr edictions\, dHvA reveals a Fermi surface which is rather distinct from the predicted one. We found that an ad-hoc shift of the calculated valence band s relative to Fermi level\, in order to match the ARPES measured bands\, an d also of the calculated electron like bands\, to explain some of the obser ved dHvA frequencies\, leads to a good agreement between calculations and e xperiments. However\, this relative displacement between electron and hole- bands would eliminate their crossings and\, therefore\, the Weyl type-II no des. We argue that this discrepancy between predictions and our experiments can be ascribed to electronic correlations and the inability of density fu nctional theory calculations to describe the electronic coupling in weakly coupled layered systems.\n\nHost: Paglione\n\n\nRefreshments Served at 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20180914T150326Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Luis Balicas\, NHMFL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171115T140000Z DTEND:20171115T212000Z DTSTAMP:20260828T094430Z UID:7l9hrfom55kcp6b3jv7b9fi8k4@google.com CREATED:20171108T184528Z DESCRIPTION:TOPOLOGICAL\n\n9:00 AMMaissam Barkeshli “Single-shot modular t ransformations: transversal logic gates and measuring fractional statistics ”\n\n9:50 AMYahya Alavirad “Edge state super current in the quantum hall r egime”\n\n10:40 AMJunhyun Lee “Chiral anomaly without Landau levels”\n\nMB L and ENTANGLEMENT\n\n11:30 AMTom Iadecola “Symmetry-protected macroscopic degeneracy in Floquet systems”\n\n12:20-1:45 Lunch Break\n\n1:50 PMXiao L i “Observation of mobility edges in a one-dimensional bichromatic incommen surate potential”\n\n2:40 PMBrian Swingle “Quantum dynamics with tensor ne tworks”\n\n3:30 PMDong-Ling Deng “Measuring Quantum Entanglement Entropy t hrough Restricted Boltzmann Machines”\n LAST-MODIFIED:20171108T184548Z LOCATION:2205 John S Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170309T173000Z DTEND:20170309T183000Z DTSTAMP:20260828T094430Z UID:p8g1ij58cp26sueeb4bh5g11l4@google.com CREATED:20170221T180300Z DESCRIPTION:Speaker Name: Brian Hunt and Zhixin Lu\n\nSpeaker Institution : University of Maryland College Park\n\nTitle : Toward a theory of reservoi r computing prediction\n\nAbstract: We consider the problem of predicting a chaotic time series from a system whose equations of motion are unknown. We use a machine-learning technique called reservoir computing\, which we f ind is often able to learn the dynamics of the system that generated the ti me series\, in the following sense. In addition to making accurate short-t erm predictions\, the reservoir predictor can generate a long-term "climate " forecast that stays close to the attractor of the actual system. We give examples\, and we discuss a preliminary theory relating reservoir predicto r performance to Lyapunov exponents and generalized synchronization in an a ssociated dynamical system. LAST-MODIFIED:20170302T213545Z LOCATION: ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160908T163000Z DTEND:20160908T173000Z DTSTAMP:20260828T094430Z UID:h89icdl54mbpjenpv1gqllgn40@google.com CREATED:20160825T174259Z DESCRIPTION:Speaker Name: Bill Fagan\n\nSpeaker Institution: University of Maryland College Park\n\nTitle: Perception and Memory in Animal Movement\n\ nAbstract: Individual animals acquire information from their surroundings\ , gain and store knowledge from experience\, and use what they have learned to navigate through dynamic landscapes. I will first discuss a mathematica l model of animal perception in dynamic landscapes (this is formulated as a partial integro-differential equation featuring non-local advection) and t hen present some biological results that frame challenges in the modeling o f spatial memory. \n\n\n\n\n LAST-MODIFIED:20160902T141747Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20180108 DTEND;VALUE=DATE:20180112 DTSTAMP:20260828T094430Z UID:16aj8a77aktc4077t15mug5t97@google.com CREATED:20180103T212741Z DESCRIPTION:Fundamentals of Quantum Materials Winter School and Workshop\n\ nMonday\, January 8\, 2018 (All day) to Friday\, January 12\, 2018 (All day )\n\nPhysical Sciences Complex / The Hotel\n\nThe Fundamentals of Quantum M aterials (FQM) Winter School and Workshop is a unique event in North Americ a\, dedicated specifically to the synthesis\, characterization and electron ic modeling of quantum materials.\n\nWinter School: Monday\, Jan. 8 - Thurs day\, Jan. 11\, 2018\, UMD Physical Sciences Complex\n\nThe FQM Winter Scho ol is aimed at providing fundamental training to our current and future gen erations of Quantum Materials scientists in synthesis and characterization techniques. It will bring together senior and junior scientists to address topics at the forefront of current research into quantum materials\, while also providing pedagogical background and practical training for junior sci entists. With an interdisciplinary and diverse crowd including physicists\, chemists\, and materials scientists\, participants will gain a basic funct ional knowledge of how to plan and carry out synthesis relevant to the stud y of quantum materials\, and will have a unique opportunity to interact wit h some of the top researchers in the field while networking with fellow pee rs. The structure of the school will include mornings of pedagogical lectur es by ten of the nation's top practicing quantum materials scientists\, wit h afternoons devoted to practical demonstrations in laboratories in the Uni versity of Maryland's Center for Nanophysics and Advanced Materials. The sc hool will also include a poster session that will be attended by senior sci entists.\n\nWorkshop: Friday\, Jan. 12\, 2018\, "The Hotel" at the Universi ty of Maryland\, College Park\, MD\n\nThe FQM Workshop\, following the scho ol event\, will cover both experimental and theoretical research on quantum materials\, focusing on synthesis\, characterization and computational app roaches to research of quantum materials such as superconductors\, strongly correlated electron systems and topological materials.\n\nhttps://fqm.phys ics.umd.edu/\n LAST-MODIFIED:20180104T200151Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:FQM Winter School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161010T190000Z DTEND:20161010T203000Z DTSTAMP:20260828T094430Z UID:lpsk55qkbdqhtcvf705r4fa300@google.com CREATED:20161007T130121Z DESCRIPTION:Speaker: Alexander Friedland\n\nSpeaker Institution: SLAC\n \nT itle: Hidden interactions of neutrinos\n\nAbstract: It has been suggested t hat short-baseline oscillations could be reconciled with cosmology with add itional interactions in the hidden sector. The standard paradigm is that th is mechanism can keep hidden neutrinos out of equilibrium with the standard model indefinitely. We reexamine this framework and find that this mechani sm is only marginally successful and the equilibration cannot be delayed be low a temperature of several hundred keV. Only a very specific window of me diator parameters remains allowed\, and\, as will be shown\, will be conclu sively tested in the near future\, by a combination of CMB and UHE neutrino experiments\, whose sensitivities are complementary. This parameter window happens to have the right properties for self-interacting and neutrino-cou pled dark matter​. It may resolve tensions between CMB data of Planck and l ocal Hubble constant and sigma8 measurements. LAST-MODIFIED:20161007T194052Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180416T110000 DTEND;TZID=America/New_York:20180416T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180416T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: Waseem Bakr

Affiliation: Princeton

Title : \; Quantum gas microscopy of atomic Fermi-Hubbard syste ms

Abstract: \;Ultracold fermions in optical lattices provide a clean physical real ization of the celebrated Fermi-Hubbard model of condensed matter\, a minim al model believed to contain the essential ingredients for high-temperature superconductivity. Recent advances in the field of quantum gas microscopy have opened up the possibility to probe and manipulate Fermi-Hubbard system s at the atomic level\, enabling quantitative studies in a temperature regi me that is challenging for state-of-the-art numerical simulations. In this talk I will report on experiments that probe equilibrium spin and density c orrelations in the Hubbard model in new regimes\, including a repulsive spi n-imbalanced system and a doped attractive system\, which turn out to be re lated to each other through a mathematical mapping. I will also report on e xperiments where we measure the transport properties of doped repulsive sys tems and observe signatures of bad metallic behavior including a linear-in- temperature resistivity that violates the Mott-Ioffe-Regel limit.

 \;

LAST-MODIFIED:20180326T173244Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171011T150000Z DTEND:20171011T160000Z DTSTAMP:20260828T094430Z UID:32dct9gcjscjpgi1ibnfj0gd07@google.com CREATED:20170811T160452Z DESCRIPTION:Speaker: Jim Freericks\n\nSpeaker Affiliation: Georgetown Unive rsity\n\nTitle: Keldysh-ETH quantum computation algorithm\n\nAbstract: We d evelop an efficient and fast quantum computational scheme to determine the equilibrium Green's functions at finite temperature without requiring any a diabatic state preparation steps. The approach works for generic models tha t obey the eigenstate thermalization hypothesis and one can show the short- time behavior of the Green's functions is produced exactly by this method. We also describe cooling schemes that could be invoked to reach lower tempe ratures than what can be reached by simple interaction-strength ramping. Th e approach requires one qbit per orbital degree of freedom plus one additio nal global ancilla qbit. Cooling requires additional ancilla qbits\, with m ore qbits providing additional cooling power. We end with a discussion on h ow this algorithm can be implemented now on currently available quantum com puters like the IBM 5 qbit machine. LAST-MODIFIED:20170811T160452Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170615T180000Z DTEND:20170615T193000Z DTSTAMP:20260828T094430Z UID:adcmkn6k4el44r31d2eop4f98c@google.com CREATED:20170607T143641Z DESCRIPTION:Speaker: Yong Zhao\n\nSpeaker Institution: Massachusetts Instit ute of Technology\n\nTitle: Parton Distribution Function with Non-perturbat ive Renormalization from Lattice QCD\n\nAbstract: The parton distribution f unction (PDF) can be calculated directly from lattice QCD by evaluating the quasi PDF\, a spatial correlation of quarks/gluons in a moving nucleon. A crucial step towards precise calculation is to do a proper renormalization of the quasi PDF on the lattice. In this talk\, I will present the lattice result of the iso-vector unpolarized quasi PDF with non-perturbative renorm alization in the regularization invariant momentum subtraction (RI/MOM) sch eme. Then\, I will show how the renormalized quasi PDF is matched to the PD F at one-loop order in the large momentum effective theory. LAST-MODIFIED:20170607T160302Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170424T200000Z DTEND:20170424T213000Z DTSTAMP:20260828T094430Z UID:bkp0dr0me77lcd7dn85reosuv0@google.com CREATED:20170412T191439Z DESCRIPTION:Speaker: Prof. Maxim Perelstein\n\nSpeaker Institution: Cornell University\n\nTitle: SIMPs and ELDERs: New Ideas for Dark Matter\n \nAbstr act: Dark Matter could reside in a hidden sector with gauge structure simil ar to the Standard Model. In particular\, the hidden sector may include a n on-Abelian gauge interaction with confinement scale around 100 MeV\, simila r to our QCD. Dark mesons\, counterparts of the usual pions\, kaons etc.\, can then play the role of dark matter. Such particles may experience strong number-changing self-interactions\, similar to the 2K<->3pi scattering fam iliar in QCD. Intriguingly\, such self-interactions can naturally produce a thermal relic abundance of dark mesons consistent with observations. In th is talk we will explore two variations of this basic scenario\, “Strongly-I nteracting Massive Particle” (SIMP) and “Elastically-Decoupling Relic” (ELD ER). We will discuss the basic features of each scenario\, explicit models in which they may be realized\, and their experimental signatures. LAST-MODIFIED:20170412T191439Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180207T203000Z DTEND:20180207T213000Z DTSTAMP:20260828T094430Z UID:2a2ad5vknntlfb71a11qriapuj@google.com CREATED:20180126T162410Z DESCRIPTION:Speaker Name: Dr. Carlos Romero-Talamas\n\nSpeaker Institution : UMBC \n\n\nTitle : Measurements of Dusty Plasma Rotation in Filament-Fre e Inductively Coupled Discharges at High Magnetic Fields \n\nAbstract : I w ill report on recent results from magnetized dusty plasma experiments carri ed out in collaboration with the Magnetized Dusty Plasma Experiment (MDPX) research group at Auburn University. Using RF antennae external to a non-co nducting cylindrical vacuum chamber we produced inductively coupled plasmas (ICP) free of the filamentary structures that have been previously observe d in capacitively coupled plasmas (CCP) at high magnetic fields and low pre ssures [E. Thomas Jr.\, et al.\, Phys. Plasmas 23\, 055701 (2016)\, and ref erences therein]. In our experiments\, silica hollow microspheres with a di ameter of 50 micronsand wall diameter on the order of 100 nm were levitated in ICP at neutral pressures varying from 5 to 300 mTorr\, and magnetic fie lds ranging from 0 to 3.25 T. Dust rotation was observed similar to previou s experiments at lower magnetic fields [N. Sato et al.\, Phys. Plasmas 8\, 1786 (2001)]. The ICP RF frequency is chosen to be 22-30 kHz\, which is low compared to other experiments that use CCP and RF of 13.56 MHz. Given this low frequency\, RF is cutoff close to the chamber's cylindrical wall\, lea ding to a plasma density gradient that peaks at the wall and is minimum at the chamber's axis. We conjecture that such density gradients cause pressur e gradients that are in turn responsible for dust rotation through ion mome ntum transfer in the grad-P x B direction\, initially proposed as an explan ation for the Sato experiments [P.K. Kaw et al.\, Phys. Plasmas 9\, 387 (20 02)]. However\, our rotation is faster than that reported by Sato et al.\, albeit at much higher fields and larger dust diameter. Rotation velocity in creases with B\, but reaches a maximum at around 1 T\, and then decreases a s B is increased. I will present hypotheses to explain this previously unse en behaviour\, our future experimental plans to test these ideas. LAST-MODIFIED:20180126T162520Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180207T160000Z DTEND:20180207T171500Z DTSTAMP:20260828T094430Z UID:32s0n7livncrn3l0sa0clmf1m2@google.com CREATED:20180122T234240Z DESCRIPTION:Speaker: Mark Rudner (Niels Bohr Institute\, Copenhagen)

Title: \;Quantized transport\, topology and thermalization in anomalou s Floquet insulators \; \;

Abstract: \;Periodic driving provides means to dynamically alter the topological properties of many-body systems. The range of phenomena that are possible in such systems\, and th e conditions needed for observing robust quantized transport\, remain impor tant open questions in the field. \; In this talk I will focus on so-ca lled anomalous Floquet insulators (AFIs) -- topologically nontrivial fermio nic phases which cannot be realized in any static (nondriven) system. \ ; Remarkably\, we find that in the presence of periodic driving there is a family of topologically distinct\, fully-localized phases in two dimensions . These phases are distinguished by the micromotion exhibited by particles in the bulk\, within the driving period. I will present a local observable (the magnetization density)\, whose value is quantized in any fully-localiz ed phase\, and which serves as a topological order parameter to distinguish the different localized phases. In the absence of interactions\, the AFI f eatures chiral edge states coexisting with localized bulk states at all val ues of quasienergy. With interactions\, the chiral AFI edges exhibit "prote cted thermalization" due to their topological nature. Using this feature\, and by tuning sample geometry\, the AFI can be used as a platform for study ing the competition between thermalizing and many-body localized regions.&n bsp\; \;

Host: Jay Sau

http://w ww.physics.umd.edu/cmtc/seminars.html

When: Wed\, Feb. 7 @ 11:00 am
Where: CMTC Conference Room (2205 Toll Physics Bldg.) \; \; LAST-MODIFIED:20180130T222901Z LOCATION:2205 John S Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161029T140000Z DTEND:20161029T160000Z DTSTAMP:20260828T094430Z UID:gp4775jim6pc7hpp3u7mtscu2s@google.com CREATED:20160926T201108Z DESCRIPTION:Speaker: Jordan Goodman\n\nTrying to understand the origin of t he most energetic particles in the Universe has lead us to build incredible experiments in place like the South Pole\, the high Mountains of Mexico an d even in depth mines. \n\nThis talk will describe these experiments and wh at we have found.\n https://sites.google.com/a/physics.umd.edu/saturday-mor ning-physics/home\n\n LAST-MODIFIED:20160926T201243Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Particle Astrophysics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161024T200000Z DTEND:20161024T210000Z DTSTAMP:20260828T094430Z UID:f9gq5v6u5u1fd4srjqpj88fqqc@google.com CREATED:20161018T140946Z DESCRIPTION:Speaker: Dr. Paul Blount from the University of Texas Southwes tern Medical Center\n\nTitle: Quest for the Next Generation of Antibiotics : A Bacterial Mechanosensor\, MscL\, as a Novel Drug Target\n\nAbstract: Ms cL is a highly conserved bacterial mechanosensitive channel found in the va st majority of bacterial species including most pathogens. It normally serv es as a biological emergency release valve: upon osmotic downshock it opens a huge 30Å pore that allows for the rapid release of many accumulated cyto plasmic components\, including potassium and glutamate\, thus preventing ce ll lysis. When the channel gates inappropriately\, it leads to slowed growt h or even cell death. MscL may therefore serve as a pharmacological target for novel antibiotics. From a High Throughput Screen (HTS)\, 22 chemical co mpounds that inhibit the growth of E. coli in a MscL-dependent and specific manner have been identified. Among these were four known antibiotics inclu ding Dihydrostreptomycin (DHS). We have found that DHS\, and perhaps other antibiotics\, use MscL as a pathway into the bacterial cell\; thus\, expres sion of the channel increases drug potency. Recently\, we have begun to cha racterize a handful of the 18 novel compounds that were identified in the H TS. Preliminary findings indicate that the majority of these compounds do i ndeed modify MscL and increase its activity\, and thus may serve as the see ds for deriving novel anti-bacterial agents.\n LAST-MODIFIED:20161018T141051Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160505T193000Z DTEND:20160505T203000Z DTSTAMP:20260828T094430Z UID:652o1679i19gul1gsv6ln0a1u4@google.com CLASS:PUBLIC CREATED:20160421T144719Z DESCRIPTION:Speaker Name: Yuchen Peng\n \nDissertation Title: Quantum Gate and Quantum State Preparation through Neighboring Optimal Control\n \nSucce ssful implementation of a fault-tolerant quantum computation on a system of qubits places severe demands on the hardware used to control the many-qubi t state. It is known that an accuracy threshold Pa exists for any quantum g ate that is to be used in such a computation. Specifically\, the error prob ability Pe for such a gate must fall below the accuracy threshold: Pe< Pa. Estimates of Pa vary widely\, though Pa∼ 10−4 has emerged as a challenging target for hardware designers. We present a theoretical framework based on neighboring optimal control that takes as input a good quantum gate and ret urns a new gate with better performance. We illustrate this approach by app lying it to all gates in a universal set of quantum gates produced using no n-adiabatic rapid passage that has appeared in the literature. Performance improvements are substantial\, both for ideal and non-ideal controls. Under suitable conditions detailed below\, all gate error probabilities fall wel l below the target threshold of 10−4.\n \nAfter applying the neighboring op timal control theory to improve the performance of quantum gates in a unive rsal set\, we further apply the general control theory in a two-step proced ure for fault-tolerant logical state preparation\, and we illustrate this p rocedure by preparing a logical Bell state fault-tolerantly. The two-step p reparation procedure is as follow: Step 1 provides a one-shot procedure usi ng neighboring optimal control theory to prepare a physical qubit state whi ch is a high-fidelity approximation to the Bell state |β01⟩ = 1/√2(|01⟩ + | 10⟩). We show that for ideal (non-ideal) control\, an approximate |β01⟩ sta te could be prepared with error probability ϵ ∼ 10−6(10−5) with one-shot lo cal operations. Step 2 then takes a block of p pairs of physical qubits\, e ach prepared in |β01⟩ state using Step 1\, and fault-tolerantly prepares th e logical Bell state for the C4 quantum error detection code.​\n\nDissertat ion Committee Chair: Prof. Victor Yakovenko\n \nCommittee: \nDr. Frank Gait an\nDr. Christopher Lobb\nDr. Frederick Wellstood\nDr. Jacob Taylor\nDr. Ch ristopher Jarzynski\n LAST-MODIFIED:20160429T183745Z LOCATION:PHY 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Doctoral Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160921T190000Z DTEND:20160921T200000Z DTSTAMP:20260828T094430Z UID:or8uk4s3cactl0ertdhmefbnbk@google.com CREATED:20160915T184910Z DESCRIPTION:Speaker Name: Dr. Ben Palmer [1]\n\nSpeaker Institution : Labor atory for Physical Sciences\, Adjunct Faculty\, UMCP\n\nTitle: Thermalizat ion of Quantum Superconducting Devices\n\nAbstract : Since the seminal resu lts of Nakamura\, Pashkin\, and Tsai [2]\, coherence times for quantum supe rconducting devices have increased from a few nanoseconds up to 100 microse conds [3]. With recent improvements in the energy relaxation times of circu it quantum electrodynamic (c-QED) devices\, the tunneling of thermal or non -equilibrium resonant microwave photons into and out of the read-out cavity \, which is used to measure the state of the qubit\, has been shown to be a source of qubit dephasing and hence decoherence [4]. I’ll describe some on going work to improve upon the thermalization of the signals going to our c -QED devices. In particular\, by designing and fabricating some microwave a ttenuators for ultra-low temperatures\, where it is easy to heat the electr ons out of equilibrium with the 10 mK phonon bath\, we have decreased the e ffective noise temperature of the signals going to the c-QED device by as m uch as a factor of two to approximately 50 mK. \n1. In collaboration with D r. Jen-Hao Yeh\, Jay Lefebvre\, Shavindra Premaratne\, and Professor Fred W ellstood.\n2. Y. Nakamura\, Yu. A. Pashkin & J. S. Tsai\, Nature 398\, 786- 788 (1999).\n3. W. Oliver & P. Welander\, MRS Bulletin 36\, 813 (2013).\n4. A. Sears\, et al.\, Physical Review B 86\, 180504(R).\n LAST-MODIFIED:20160915T190017Z LOCATION:LPS Seminar SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar - Thermalization of Quantum Superconducting Devices TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171013T201500Z DTEND:20171013T211500Z DTSTAMP:20260828T094430Z UID:3a0v4gkk5ogcll67moio55a6cr@google.com CREATED:20171004T171616Z DESCRIPTION:Speaker: Minh Tran\n\nAffiliation: QuICS/JQI\n\nTitle: Lieb-Rob inson bounds on n-partite connected correlations\n\nAbstract: Lieb and Robi nson provided bounds on how fast bipartite connected correlations can arise in systems with only short-range interactions. We generalize Lieb-Robinson bounds on bipartite connected correlators to multipartite connected correl ators. The bounds imply that an n-partite connected correlator can reach un it value in constant time. Remarkably\, the bounds also allow for an n-part ite connected correlator to reach a value that is exponentially large with system size in constant time\, a feature which stands in contrast to bipart ite connected correlations. We provide explicit examples of such systems.\n \n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171004T171616Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161022T140000Z DTEND:20161022T160000Z DTSTAMP:20260828T094430Z UID:0fja9fvgmrbk5j6plr7fcqt648@google.com CREATED:20160926T201429Z DESCRIPTION:Speaker Name: Victor Yakovenko\, UMD\n\nThe probability distrib ution of money among the agents in a closed economic system can be derived similarly to the probability distribution of energy among molecules in a ga s\, by treating economic transactions as collisions between molecules.\n\nA nalysis of empirical data shows that income distributions in the USA\, Euro pean Union\, and other countries exhibit a well-defined two-class structure . The majority of the population (about 97%) belongs to the lower class ch aracterized by the exponential ("thermal") distribution\, as in a gas. The upper class (about 3% of the population) is characterized by a power-law ( "superthermal") distribution\, and its share of the total income expands an d contracts dramatically during booms and busts in financial markets. \n\n\ nAll papers are available at http://physics.umd.edu/~yakovenk/econophysics/ . For a recent coverage in Science magazine\, see http://www.sciencemag.or g/content/344/6186/828\n\nhttps://sites.google.com/a/physics.umd.edu/saturd ay-morning-physics/home\n\n LAST-MODIFIED:20161017T140402Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Statistical mechanics of money TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160601T150000Z DTEND:20160601T160000Z DTSTAMP:20260828T094430Z UID:6j52jiiji25hgcbf60sqipc8ts@google.com CREATED:20160418T140424Z DESCRIPTION:Speaker: Jim Garrison \n\nSpeaker Affiliation: University of Ca lifornia Santa Barbara \n\nTitle: Universal Aspects of Quantum Thermalizati on\n\nAbstract: A very fundamental problem in quantum statistical mechanics involves whether--and how--an isolated quantum system will thermalize at l ong times. In quantum systems that do thermalize\, the long-time expectati on value of any "reasonable" operator will match its predicted value in the canonical ensemble. The Eigenstate Thermalization Hypothesis (ETH) posits that this thermalization occurs at the level of each individual energy eig enstate\; in fact\, any single eigenstate in a microcanonical energy window will predict the expectation values of such operators exactly. In recent work\, we have identified\, for a generic model system\, precisely which op erators satisfy ETH\, as well as the limits to the information contained in a single eigenstate. Remarkably\, our results strongly suggest that a sin gle eigenstate can contain information about energy densities--and therefor e temperatures--far away from the energy density of the eigenstate. After considering eigenstates\, I will return to the more general case of time ev olution following a quantum quench\, and study which operators thermalize f or typical initial states. LAST-MODIFIED:20160418T140424Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171204T200000Z DTEND:20171204T213000Z DTSTAMP:20260828T094430Z UID:7nmeq8kgbvbmv6aejg23lr7etg@google.com CREATED:20171127T143045Z DESCRIPTION:Speaker: Oliver Janssen\n\nSpeaker Institution: NYU\n\nTitle: A xions of Evil\n \nAbstract: A systematic framework for theories of many axi ons will be discussed\, which involves the identification of approximate sy mmetries that renders these theories tractable. Theories with O(100) axions and random model parameters have an exponential number of long-lived meta- stable vacua\, whose dominant decay channel can be shown to generically lea d to a prolonged period of slow roll inflation and a diverse range of infla tionary observables. At the end of inflation the universe may reheat throug h a coupling to matter or radiation\, and very light fields can serve as fu zzy dark matter with the correct abundance. Finally\, the cosmological cons tant problem may be solved anthropically in these landscapes since there ar e sufficiently many finely spaced vacua. Hence\, this model can reproduce m any macroscopic features of our universe without tuned parameters.\nThis wo rk was done in collaboration with Thomas Bachlechner\, Kate Eckerle and Mat t Kleban\, and is based on 1703.00453\, 1709.01080 and an upcoming paper. LAST-MODIFIED:20171127T143045Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170901T201500Z DTEND:20170901T211500Z DTSTAMP:20260828T094430Z UID:75u2sma2darq9fjhnqg2qe00rq@google.com CREATED:20170824T182744Z DESCRIPTION:Speaker: Clay Crocker\n\nSpeaker Affiliation: JQI\n\nTitle: Mul ti-Species Trapped-Ion Node for Quantum Networking\n\nAbstract: Trapped ato mic ions are a leading platform for quantum information networks\, with lon g-lived identical qubit memories that can be locally entangled through thei r Coulomb interaction and remotely entangled through photonic channels. How ever\, performing both local and remote operations in a single node of a qu antum network requires extreme isolation between spectator qubit memories a nd qubits associated with the photonic interface. We achieve this isolation by cotrapping 171Yb+ and 138Ba+ qubits. We further demonstrate the ingredi ents of a scalable ion trap network node with two distinct experiments that consist of entangling the mixed species qubit pair through their collectiv e motion and entangling a 138Ba+ qubit with an emitted visible photon.\n\n* Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20170824T182744Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161017T150000Z DTEND:20161017T163000Z DTSTAMP:20260828T094430Z UID:i2igqtrau4hkjbim6k803m06m8@google.com CREATED:20160926T124323Z DESCRIPTION:Speaker: Michael Doring\n\nSpeaker Institution: George Washingt on University\n\nTitle: Multi-Particle States in the Finite Volume\n\nAbstr act: The extraction of hadronic scattering parameters from lattice data by using the Lüscher approach becomes increasingly complicated in the presence of inelastic channels. A method for the direct extraction of the complex h adron-hadron optical potential on the lattice is proposed\, which does not require the use of the multi-channel Lüscher formalism. Moreover\, this met hod is applicable without modifications if some inelastic channels contain three or more particles. The chiral extrapolation of coupled-channel meson- meson scattering is also discussed. LAST-MODIFIED:20161006T155624Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar - Multi-Particle States in the Finite Volum e TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180409T200000Z DTEND:20180409T213000Z DTSTAMP:20260828T094430Z UID:6s3qq3mjpdonu4j39cuiavomnd@google.com CREATED:20180327T135809Z DESCRIPTION:\nSpeaker: Ofri Telem\n\nSpeaker Institution: Cornell Universit y\n\nTitle: Self-Destructing Dark Matter\n\nAbstract: We present Self-Destr ucting Dark Matter (SDDM)\, a new class of dark matter models which are det ectable in large neutrino detectors. In this class of models\, a component of dark matter can transition from a long-lived state to a short-lived one by scattering off of a nucleus or an electron in the Earth. The short-lived state then decays to Standard Model particles\, generating a dark matter s ignal with a visible energy of order the dark matter mass rather than just its recoil. This leads to striking signals in large detectors with high ene rgy thresholds. We present a few examples of models which exhibit self dest ruction\, all inspired by bound state dynamics in the Standard Model. The m odels under consideration exhibit a rich phenomenology\, possibly featuring events with one\, two\, or even three lepton pairs\, each with a fixed inv ariant mass and a fixed energy\, as well as non-trivial directional distrib utions. This motivates dedicated searches for dark matter in large undergro und detectors such as Super-K\, Borexino\, SNO+\, and DUNE. LAST-MODIFIED:20180327T135814Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161015T140000Z DTEND:20161015T160000Z DTSTAMP:20260828T094430Z UID:argfpmf464id93en7rt8g4h4qg@google.com CREATED:20160926T200941Z DESCRIPTION:Speaker: Sarah Eno\n\nPhysicists claim that the amazingly dive rse universe that we see is in reality composed of only a very small number fundamental particles and only four fundamental forces.\n\nBut how do we k now this is true? \n\nI will talk about two of the most important tools we have for studying fundamental forces and matter: accelerators and detector s. I will look at their history from the early experiments of J.J. Thomson and Ernest Rutherford to the recent discovery of the Higgs Boson at the La rge Hadron Collider. I will discuss why we need such incredibly large mach ines to study matter at very small distance scales\, and explain in detail what they are made of and how they work.\n\n https://sites.google.com/a/phy sics.umd.edu/saturday-morning-physics/home\n\n LAST-MODIFIED:20160926T201601Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: Detectors and Accelerators TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171114T160000 DTEND;TZID=America/New_York:20171114T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171114T160000 CREATED:20170809T180226Z DESCRIPTION:Speaker Name: Alipasha Vaziri\n\nSpeaker Institution: Rockefe ller University\n\nTitle: Optical Tools for Unraveling Whole-brain Neurona l Circuit Dynamics Underlying Behavior \n\nAbstract: The combination of opt ogenetics and high speed functional imaging are providing new opportunities to understand how the collective dynamics of neurons in functional network s leads to behavior. \n\nWhile traditional imaging modalities based on two- photon imaging have relied on the manipulations of light in the spatial dom ain\, multi-photon microscopy via femtosecond optical pulses can also provi de a new degree of freedom via the pulse spectrum that can be used to “scul pt” the spatial localization of light within the sample. This has been exem plified in the technique of temporal of focusing through which a decoupling of the axial from the lateral confinement of light can be achieved. Using this technique in combination with genetically encoded calcium (Ca2+) indic ators we have demonstrated near-simultaneous recording of whole-brain neuro nal activity in C. elegans at single cell resolution. More recently we deve loped a variant light sculpting microscopy that has enabled unbiased single - and dual-plane high-speed (up to 160 Hz) Ca2+ imaging in the mouse cortex as well as in vivo volumetric calcium imaging of a mouse cortical column ( 0.5 mm×0.5 mm×0.5 mm) at single-cell resolution and fast volume rates (3–6 Hz). This has enabled in vivo recording of calcium dynamics of several thou sand neurons across cortical layers and in the hippocampus of awake behavin g mice.\n\nLight-field microscopy in combination with 3D deconvolution and other more sophisticated mathematical signal demixing strategies is another highly scalable approach for high-speed volumetric Ca2+ imaging. Using thi s technique termed Seeded Iterative Demixing (SID)\, we have recently demon strated video-rate recoding of neuronal activity within a volume of 0.6mm×0 .6 mm×0.2 mm located as deep as 380 μm in the scattering mouse as well as w hole-brain imaging of larval zebrafish during sensory stimulation. These to ols combined with high speed optogentic control of neuronal circuits\, adva nced statistics tools and mathematical modeling and will be crucial to move from an anatomical wiring map towards a dynamic map of neuronal circuits.\ n\n\nHosted by: Mohammad Hafezi\n LAST-MODIFIED:20171113T182537Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160906T171500Z DTEND:20160906T183000Z DTSTAMP:20260828T094430Z UID:c99n8883qqko7e4ffjujo0jcd8@google.com CREATED:20160901T172600Z DESCRIPTION:Speaker Name: Professor Brian Hunt\n\nSpeaker Institution : UMC P\n\nTitle : Defining Chaos LAST-MODIFIED:20160901T172732Z LOCATION:IPST Building 085\, Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161110T173000Z DTEND:20161110T183000Z DTSTAMP:20260828T094430Z UID:hsi17dvg2i8q6cdnugau7j4fuo@google.com CREATED:20160825T184040Z DESCRIPTION:Speaker Name: Howard Milchberg\n\nSpeaker Institution: Univer sity of Maryland | Department of Electrical and Computer Engineering\, Depa rtment of Physics\n\nTitle: Spatio-Temporal Optical Vortices \n\nAbstract: When an optical pulse propagating through a nonlinear medium exceeds a cer tain threshold power\, it can focus itself and collapse\, in theory\, to a singularity. In practice\, several physical mechanisms mitigate or arrest t he catastrophic collapse and the pulse continues propagation as a filamenta ry structure. This scenario has played out in many nonlinear optics systems over decades: among them are air filamentation\, relativistic self-focusin g in plasmas\, nonlinear generation of broadband light\, laser-material pro cessing\, and unintentional (and expensive) laser damage. Recently\, we sho wed that self-focusing collapse and collapse arrest is universally accompan ied by the generation of robust topological structures: spatio-temporal opt ical vortices (STOVs). In contrast to the conventional orbital angular mom entum vortices in\, for example\, Laguerre-Gaussian beams\, which can be de scribed purely by spatial coordinates\, STOVs have electromagnetic phase ci rculation in a spatio-temporal plane that propagates with the pulse and dir ects the global pulse energy flow. I will describe our experiments\, simul ations and calculations leading to our discovery of STOVs \, and discuss fu ture possible applications.\n LAST-MODIFIED:20161104T142051Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180307T180000Z DTEND:20180307T203000Z DTSTAMP:20260828T094430Z UID:5q6l639srh9hurknem5s5pp9go@google.com CREATED:20180228T165429Z DESCRIPTION:Sp eaker Name: Diego Del-Castillo-Negrete

Speaker Institution : Oak Ridge National Laboratory

Titl e : Full-orbit and backward Monte Carlo simulation of runaway electrons&nbs p\;

Notes: High-ener gy relativistic runaway electrons (RE) can be produced during magnetic disr uptions due to \;
electric fields generated during the thermal and current quench of the plasma. Understanding this problem is key for the safe operat ion of ITER because\, if not avoided or mitigated\, RE can severely damage the plasma facing components. In this presentation we report on RE simulati on efforts centered in two complementary approaches: (i) Full orbit (6-D ph ase space) relativistic numerical simulations in general (integrable or cha otic) 3-D magnetic and electric fields\, including radiation damping and co llisions\, using the recently developed particle-based Kinetic Orbit Runawa y electron Code (KORC) and (ii) Backward Monte-Carlo (MC) simulations based on a recently developed efficient backward stochastic differential equatio ns (BSDE) solver. Following a description of the corresponding numerical me thods\, we present applications to: (i) RE synchrotron radiation (SR) emiss ion using KORC and (ii) Computation of time-dependent runaway probability d istributions\, RE production rates\, and expected slowing-down and runaway times using BSDE. We study the dependence of these statistical observables on the electric and magnetic field\, and the ion effective charge. SR is a key energy dissipation mechanism in the high-energy regime\, and it is also extensively used as an experimental diagnostic of RE. Using KORC we study full orbit effects on SR and discuss a recently developed SR synthetic diag nostic that incorporates the full angular dependence of SR\, and the locati on and basic optics of the camera. It is shown that oversimplifying the ang ular dependence of SR and/or ignoring orbit effects can significantly modif y the shape and overestimate the amplitude of the spectra. Applications to DIII-D RE experiments are discussed. LAST-MODIFIED:20180228T165553Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161121T210000Z DTEND:20161121T220000Z DTSTAMP:20260828T094430Z UID:me7u3kd818r4ieffri112ko2b8@google.com CREATED:20161115T212421Z DESCRIPTION:Speaker Name: Dr. Anne Gershenson\n\nSpeaker Institution : Univ ersity of Massachusetts Amherst\n\nTitle : Binding to and Searching Membran es: A Tale of Two Bacterial Virulence Factors\n\nAbstract : How do phosphol ipase Cs associated with bacterial virulence bind to membranes and search f or substrates? Bacillus species and Staphylococcus aureus both secrete a ph osphatidylinositol-specific phospholipase C (PI-PLC) enzyme which cleaves G PI-anchored proteins off the outer leaflet of eukaryotic cells\, helping th e bacteria evade host defenses. Despite sequence and structural similaritie s and similar host cell targets\, the membrane binding mechanisms of these two homologous PI-PLCs are quite different. Monomeric Bacillus thuringiensi s PI-PLC (BtPI-PLC) uses cation-π interactions between choline headgroups a nd numerous Tyr residues to specifically recognize and bind to zwitterionic phosphatidylcholine (PC)\, an abundant phospholipid in the outer membrane of eukaryotic cells. In contrast\, while specific PC recognition can be eng ineered into S. aureus PI-PLC (SaPI-PLC)\, SaPI-PLC does not specifically b ind PC and may be most active as a dimer on membrane surfaces where binding of anionic lipids appears to compete with dimerization. In analogy to the speed-stability paradox observed for proteins searching DNA\, there appears to be a balance between membrane affinity and enzymatic activity. Tight (µ M) binding likely traps surface-bound enzyme interfering with the search fo r additional substrates. Under such tight binding conditions\, single molec ule fluorescence microscopy studies of fluorescently labeled BtPI-PLC inter acting with model membranes reveal a membrane residence time of 380 ± 50 ms ec at 22°C. Single molecule observations of peripheral membrane enzymes in cells by other groups also show 100s of msec residence times suggesting tha t a combining short two-dimensional scoots on the membrane with three dimen sional hops may be an effective way to search for substrates on complex two -dimensional surfaces. LAST-MODIFIED:20161115T212421Z LOCATION: 0112 CHEM SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160812T200000Z DTEND:20160812T210000Z DTSTAMP:20260828T094430Z UID:7k9dji0vuggko583mdf23a8kl0@google.com CLASS:PUBLIC CREATED:20160803T151032Z DESCRIPTION:Speaker: Yang Wang\n\nInstitution: JQI\n\nAs a powerful tool\, optical lattice makes it possible to study various areas of physics with co ld atoms\, such as modeling condensed matter systems\, precision measuremen t\, and quantum information. In this lecture I will talk about the basic co ncepts of optical lattices\, the state-of-the-art techniques that people us e to manipulate and probe atoms inside an optical lattice\, and versatile a pplications exploring new and exciting physics. \n\n\n(The JQI summer schoo l is for students and postdocs\, but others are welcome to join for refresh ments afterwards\; Discussion with pizza and refreshments at 5:00pm) LAST-MODIFIED:20160803T151032Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180315T123000 DTEND;TZID=America/New_York:20180315T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180315T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker Name: Francisco Sorrentino\n\nSpeaker Institution: Uni versity of New Mexico Department of Mechanical Engineering\n\n\nTitle: Opti mal control of networks: energy scaling and open challenges\n\n\nAbstract: Recent years have witnessed increased interest from the scientific communit y regarding the control of complex dynamical networks. Some common types of networks examined throughout the literature are power grids\, communicatio n networks\, gene regulatory networks\, neuronal systems\, food webs\, and social systems. Optimal control studies strategies to control a system that minimize a cost function\, for example the energy that is required by the control action.We show that by controlling the states of a subset of the no des of a network\, rather than the state of every node\, the required energ y to control a portion of the network can be reduced substantially. The ene rgy requirements exponentially decay with the number of target nodes\, sugg esting that large networks can be controlled by a relatively small number o f inputs\, as long as the target set is appropriately sized. An important o bservation is that the minimum energy solution of the control problem for a linear system produces a control trajectory that is nonlocal. However\, wh en the network dynamics is linearized\, the linearization is only valid in a local region of the state space and hence the question arises whether opt imal control can be used. We provide a solution to this problem by determin ing the region of state space where the trajectory does remain local and so minimum energy control can still be applied to linearized approximations o f nonlinear systems. We apply our results to develop an algorithm that dete rmines a piecewise open-loop control signal for nonlinear systems. Applicat ions include controlling power grid dynamics and the regulatory dynamics of the intracellular circadian clock. This work is in collaboration with Isaa c Klickstein and Afroza Shirin (UNM). LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180228T160000Z DTEND:20180228T170000Z DTSTAMP:20260828T094430Z UID:61kddcq16qoi7umcgg2jnjmnn7@google.com CREATED:20180221T195321Z DESCRIPTION:Speaker: Guang Hao Low

Affiliation: Microsoft

Title: Advances in optimal Hamiltonian simulation

Abstract: The exponential speedups promised by Hamiltonian simulation on a quant um computer depends crucially on structure in both the Hamiltonian and the quantum circuit \;that encodes its description. In the quest to better approximate time-evolution\, we motivate a systematic approach to understan ding and exploiting structure\, in a setting where Hamiltonians are encoded as measurement operators of unitary circuits \;for generalized measure ment. This allows us to define a \;uniform spectral amplification \;problem on this framework for expanding the spectrum of encoded Ham iltonian with exponentially small distortion. We present general solutions to uniform spectral amplification in a hierarchy where factoring this encod ing \;into unitary oracles represents increasing structural knowledge o f the encoding. Combined with structural knowledge of the Hamiltonian and r ecent 'quantum signal processing' and 'Qubitization' techniques\, specializ ing these results allow us better simulate time-evolution by \;sparse H amiltonian. Up to logarithmic factors\, this is a polynomial improvement up on prior art.

LAST-MODIFIED:20180221T195321Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170210T171500Z DTEND:20170210T181500Z DTSTAMP:20260828T094430Z UID:m5uos8af52qmvpgc8h0dgj4bd0@google.com CREATED:20170201T150445Z DESCRIPTION:Speaker Name: Kristin Beck\n\nSpeaker Institution: JQI\n\nTitle : Cavity Cooling of Many Atoms\n\nAbstract: We demonstrate cooling of an at omic ensemble from 200 µK to 10 µK in 100ms using an optical cavity and lig ht that is far detuned from the atomic transitions. The cavity modifies the atomic emission spectrum which allows us to extract thermal kinetic energy from the atomic system. I'll describe the experiment and our cooling metho d\, place it in the context of other common atomic cooling methods\, and pr ovide outlook for applying this technique to cool more atoms with more comp licated energy level diagrams. (Preprint : arXiv:1701.01226) LAST-MODIFIED:20170201T150445Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180910T190000Z DTEND:20180910T203000Z DTSTAMP:20260828T094430Z UID:6bim5l4p54pjq4k66hm1f2q5qo@google.com CREATED:20180904T135732Z DESCRIPTION:Title: Self-Interacting Dark Matter and Galaxy Rotation Curves\ n\nSpeaker: Hai-bo Yu\, Speaker Institution: University of California River side\n\nAbstract: Astrophysical observations spanning from dwarf galaxies t o galaxy clusters indicate that dark matter halos are much more diverse tha n predicted in the prevailing cold dark matter theory. In this talk\, I wil l show that self-interacting dark matter (SIDM) provides a unified solution to a number of puzzles on galactic scales\, including the diverse galaxy r otation curves\, the radial acceleration relation\, and the density cores i n galaxy clusters. Using detailed fits to the stellar kinematics\, we are a ble to measure the self-interacting cross section as a function of kinetic energy and deduce the particle physics parameters of the SIDM model. I will also discuss smoking-gun signatures of SIDM in direct detection experiment s and collider searches. LAST-MODIFIED:20180905T193436Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161006T150000Z DTEND:20161006T160000Z DTSTAMP:20260828T094430Z UID:8ci9kjibm53btikepu04n7g8js@google.com CREATED:20160907T155900Z DESCRIPTION:Speaker Name: Parsa Bonderson \n\nSpeaker Institution: Microso ft Station Q Santa Barbara\n\nTitle: Fermionic Topological Phases and Modul ar Transformations (Part 2)\n\nAbstract: The effective theories describing bosonic topological phases of matter has been well-understood in terms of t opological quantum field theories for many years. In contrast\, the general mathematical structure of fermionic topological phases has remained unspec ified. I will detail the algebraic structure of universal properties of fer mionic topological phases\, such as quasiparticle braiding statistics and m odular transformation\, which are crucially related to the spinor structure of the physical fermions.\n\n\nLocation: 2205 John S. Toll Physics Buildin g\n\nHost: Yang-Le Wu\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20161003T205322Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160914T200000Z DTEND:20160914T210000Z DTSTAMP:20260828T094430Z UID:ktn08e8oqficec3iv6ufeshqig@google.com CREATED:20160908T143454Z DESCRIPTION:Speaker Name: Prof. Francesco Volpe\n\nSpeaker Institution : Co lumbia University\n\nTitle : Experimental Stellarator Research at Columbia University\n\nAbstract: Fusion-relevant research is conducted on two stell arators at Columbia University\, and a third one is under conceptual design for non-fusion\, accelerator-relevant studies. \n\nThe Columbia Non-neutra l Torus (CNT) has been modified for the study of quasi-neutral plasmas form ed and heated by Electron Cyclotron (EC) and Electron Bernstein Waves (EBWs ) at 2.45GHz. Four areas of active research will be discussed. First\, a de tailed study of the CNT error fields will be described. In this study\, an optimization procedure is employed to identify misalignments in the coil se t that improve agreement between Biot-Savart calculations and measured vacu um flux surfaces. Second\, another inverse method for stellarator will be p resented: by an onion-peeling algorithm –a 3D generalization of Abel invers ion-\, it was possible to extract radial profiles of emissivity from 2D vis ible images of the CNT plasma. Third\, the recent upgrade of the 2.45 GHz h eating system from 1 kW to 10 kW will be presented. This is an intermediate step toward the objective of studying high-β overdense plasmas heated by E BWs at powers of order 100 kW. VMEC equilibria were computed both in free a nd fixed boundary at CNT\, which is the stellarator with the lowest aspect ratio in the world\, and high-β equilibria were shown to exist\; the next s tep will be to numerically study their ballooning stability. Finally\, we d escribe research on the observed synergy between low-power ECH and thermoel ectrons from heated filaments. Preliminary results suggest that the injecti on of thermoelectrons expands the range of neutral pressures at which ECH b reakdown is possible\, and increases the attainable electron densities. Thi s apparent expansion of the accessible parameter space could be of interest to tokamaks and spherical tokamaks seeking to minimize the central solenoi d flux required for plasma start-up.\n\nThe second device covered in this o verview has shown\, by means of an electron beam\, that rotational transfor m can be generated in a toroidal configuration constructively similar to a tokamak\, but solenoid-free and with tilted toroidal-field coils. The coils are planar and\, in fact\, circular\, hereby the device name CIRCUS. In ad dition\, the coils are interlinked to each other\, which helps reducing the aspect ratio but is not strictly required. No current drive is necessary e ither\, as theory and experiment confirmed\, but EC current drive will add flexibility to the rotational transform profile. CIRCUS features six tilted coils\, but encouraging simulations of configurations featuring more and m ore coils (hence\, more and more axisymmetric) will also be presented. \n\n Finally\, modeling suggests that a small classical stellarator plasma not o f hydrogen isotopes but of\, say\, bismuth\, gold or lead\, might improve t he production-rate and charge-state of ions in EC-resonant ion sources (ECR IS) over their conventional magnetic-mirror and hexapole design. The ultima te goal of this field of research is the production of fully stripped urani um. Interestingly\, the plasma density\, temperature and confinement necess ary to achieve such goal are comparable with the requirements for a burning fusion plasma. Single-particle trajectories show how the ions could be mag netically extracted from such a toroidal source and injected in accelerator s for nuclear and particle physics studies\, as well as for hadron-therapy. LAST-MODIFIED:20160913T152622Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161102T150000Z DTEND:20161102T160000Z DTSTAMP:20260828T094430Z UID:dtl3rh85ia8678ea9slijmv8m8@google.com CREATED:20160907T160450Z DESCRIPTION:Speaker: Jeffrey Teo (University of Virginia)\n\nTitle: Between topological strings and topological phases\n\nAbstract: Topological phases in two and three dimensions can be theoretically constructed by coupled-wi re models whose fundamental constituents are electronic channels along stri ngs. On the other hand the collective topological phases support further fr actionalized emergent quasi-string excitations or defects such as flux vort ices. In this talk I will describe topological superconductors and Dirac (o r Weyl) semimetals using coupled-wire models\, and discuss the fractional b ehavior of emergent topological strings.\n\nLocation: 2205 John S. Toll Phy sics Building\n\nHost: Ching-Kai Chiu\n\nhttp://www.physics.umd.edu/cmtc/se minars.html LAST-MODIFIED:20161026T113314Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161111T171500Z DTEND:20161111T181500Z DTSTAMP:20260828T094430Z UID:o63joto01dhjbplk2n3pieg3k0@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.o63joto01dhjbpl k2n3pieg3k0 CREATED:20161103T132006Z DESCRIPTION:Title : A supersonically expanding Bose-Einstein condensate: an alogies to the expanding universe?\n\nSpeaker Name: Avinash Kumar\n\nSpeake r Institution: JQI\n\nAbstract: In standard cosmology\, the expansion of t he early universe occurs at a speed larger than the speed of light. This ex pansion also impacts many of the quantum fields that exist inside our unive rse. Our experiment consisting of neutral $^{23}$Na Bose-Einstein condensat e trapped in an all optical ring realizes the basic features of this expans ion. Specifically\, we demonstrate redshifting of phonons and a reheating e ffect that is similar to pre-heating after the inflation stage of the unive rse. We also observe spontaneous non-zero winding numbers appear in the rin g after the expansion is complete. We predict the widths of the resulting w inding number distributions using Monte Carlo simulations according to the geodesic rule. Our experimental data agrees well with our theory\, with no tunable parameters.\n\nJoin with Google Hangouts: https://plus.google.com/h angouts/_/calendar/bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIu Z29vZ2xlLmNvbQ.o63joto01dhjbplk2n3pieg3k0?hs=121 LAST-MODIFIED:20161109T202532Z LOCATION:PSC 2136\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170427T223000Z DTEND:20170427T233000Z DTSTAMP:20260828T094430Z UID:5ov82qd38e8ju501raqvq2f0cg@google.com CREATED:20170213T160646Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\n\nTentative schedule:\n\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Pro f. Steve FetterThe Day After Trinity\nMar 16Dr. Eric DennaThe Imitation Gam e\nMar 30Prof. James GatesThe Day The Earth Stood Still\nApr 13Prof. Juan U riagerekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill DorlandChina Syndrome\n LAST-MODIFIED:20170309T192914Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: Particle Fever TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171003T180000Z DTEND:20171003T190000Z DTSTAMP:20260828T094430Z UID:1nuetgf6hhmtod1n84pc6p065a@google.com CREATED:20170922T205845Z DESCRIPTION:Seminar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm. Times are tentative.\n\nSpeaker: Prof. Andy Haas\n\nSpeak er Institution: New York University\n\nTitle: Digging deeper for new physic s at the LHC: General Search at ATLAS and a New Detector for Milli-charged Particles\n \nAbstract: With the Higgs Boson discovered 5 years ago and no signs of Susy or other "expected" new physics so far at the LHC\, I discuss two more radical means of uncovering new physics at the LHC. The General S earch uses Run2 data from ATLAS to look for generic bumps or excesses in a wide range of model-independent final states. And the milliQan experiment\, near CMS\, is a new detector which would be sensitive to heavy milli-charg ed particles for the first time at a high-energy collider. LAST-MODIFIED:20170928T135027Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint particle theory-experiment Maryland-Hopkins Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180403T150000Z DTEND:20180403T161500Z DTSTAMP:20260828T094430Z UID:2debe7p8ehf1vvnfu2cb1gtd46@google.com CREATED:20180122T235245Z DESCRIPTION:Speaker: Qimiao Si (Rice)

Title: Magnetism and topology in strong ly correlated metals

Abstract: Central to the correlated electron syst ems is the notion that novel phases develop near magnetism\, which leads to a rich phase competition. When a large spin-orbit coupling accompanies str ong electron correlations\, topological electronic states emerge in the glo bal quantum phase diagram. In this talk\, I will make these general points by specific theoretical models for strongly correlated metals and their rea lizations in experiments. Through these discussions\, I also hope to highli ght a unusual path that links the prototypical cases of quantum criticality and strange metal behavior to a seemingly unrelated setting of correlation -driven topological semimetals.

Host: Victor Galitski

http://www.physics.umd.edu/cmtc/seminars.html

When: Tue\, Apr. 3 @ 11:00am
Where: CMTC Conference Room (2205 T oll Physics Bldg.) \; \; \; \; LAST-MODIFIED:20180321T170031Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:3 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170330T210000Z DTEND:20170330T220000Z DTSTAMP:20260828T094430Z UID:7lcch2ubi3ckeme5bvtl25pd28@google.com CREATED:20170327T184047Z DESCRIPTION:Disruption & Opportunity: Technology Risks in a Fast-Paced Glob al Technology World\n\nReception: 4:30 PM | Lecture: 5:00 PM\nLecture Hal l\, 1110 Kim Engineering Building\n\nRSVP for this FREE event: https://go.u md.edu/2017W-TAntkowiak\n\nEvent URL: http://go.umd.edu/antkowiak LAST-MODIFIED:20170327T184313Z LOCATION:1110 Kim Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Clark School Whiting-Turner Lecture TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180424T150000Z DTEND:20180424T160000Z DTSTAMP:20260828T094430Z UID:6ogicgj8fpmpsoalmalb1acmir@google.com CREATED:20180406T192648Z DESCRIPTION:Speaker Name: Nicolo' Defenu

Speaker Institution : Ruprecht Karls Universität Heidelberg


Title : Criticality in Quantum Long Range Systems


Abstract : The interest in long range interacting systems has recently raised due to thei r experimental realization in cold atom setups. Our \;inve stigation focuses on the derivation of the phase diagram and the \;critical exponents of weak long range interacting N components qua ntum \;rotor models (the N = 1 case being the quantum Isin g model). Our picture \;is generic\, non perturbative and it is valid for any spin components \;number $N$\, spatial dimension $d$ and decay exponent $\\sigma$. The phase \;d iagram as a function of the decay exponent $\\sigma$ is rich and the \; correlation functions are strongly anisotropic in the spatial and time \;domains. The results are in good agreement with Monte Carlo \;simulations and Density matrix renormalizat ion group calculations \;pursued on quantum Ising and XY s pin chains and also with spin systems
coupled with an anoma lous Bosonic bath.


 LAST-MODIFIED:20180406T192916Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170922T201500Z DTEND:20170922T211500Z DTSTAMP:20260828T094430Z UID:3g8ve7k6c0ktpt17pdk5a1ssro@google.com CREATED:20170913T135113Z DESCRIPTION:Speaker: Jiehang Zhang\n\nAffiliation: JQI\n\nTitle: Out of equ ilibrium dynamical phase transition with trapped ion spins. \n\nAbstract: T rapped atomic ions are an ideal platform for building novel quantum systems from the ground up. The combination of long-lived qubit coherence time and mature laser manipulation techniques compose the building blocks of a quan tum computer. We use this toolbox to engineer interacting many-body systems \, where the spins are encoded in atomic hyperfine states and entangled via the shared motional quantum bus. This has enabled long-range quantum Ising models with individual measurement and control\, which are scaled up to 50 + spins\, where the dynamics is hard to tract classically. In this talk I w ill present our most recent observation of an out of equilibrium dynamical phase transition\, where traditional statistical mechanics do not apply. Th e signatures of the phase transition is manifested in both low order observ ables such as magnetizations and two-body correlators\, and becomes more di stinct for higher order correlations such as the formation probability. We present the first experimental observation of this correlator with our sing le shot single-site resolved imaging capability.\n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20170913T135113Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180321T190000Z DTEND:20180321T200000Z DTSTAMP:20260828T094430Z UID:2a81tmh6944vpt661lt2qbsvnv@google.com CREATED:20180316T144759Z DESCRIPTION:

Speaker: \; \;Dr. Andrew J. Kerman

Affiliation: MIT Lincoln Laboratory

Title: \;Quantum Error Suppression wi th Superconducting Qubits

Time:  \;3:00 pm EST (refreshments available at 2:30 pm)  \;

Date: Wednesday\, March 21\, 2018

Location: \; LPS Downst airs Conference Room

 \;

Abstract:

The operational coherenc e of superconducting qubits in quantum information processing applications has improved dramatically in recent years\, due to combination of improveme nts in materials\, fabrication processes\, qubit circuit design\, and modes of operation. However\, it now appears that substantial further progress w ill likely require as yet unknown advances that go beyond incremental engin eering improvements. One possible exception to this is the use of passive q uantum error suppression (QES)\, the best-known example of which is dynamic al decoupling of noise from pulsed gate operations in quantum computing. In this talk\, I will focus on a different kind of QES in which encoded logic al qubit states are protected (passively) from errors by adding chosen ener gy penalty terms to the system Hamiltonian such that physical error process es can only occur if the environment can supply a large energy.

< p>I will describe two new kinds of superconducting circuits which pro vide the key capabilities needed to realize this kind of QES. First\, a new type of superconducting flux qubit called the Josephson phase-slip qubit\, which naturally emulates a zero-field vector magnetic moment\, and makes f ull anisotropic Heisenberg interactions between such moments possible\; and second\, a new type of coupling circuit which can produce strong\, four-sp in interactions between these vector moments. I will show full quantum simu lations of the resulting logical qubits\, and briefly describe how they can be used in the context of both quantum annealing and quantum computation.< /span>

 \;

Biography:

Dr. Andrew J. Kerman is currently a senior staff membe r in the Quantum Information and Integrated Nanosystems Group\, pursuing re search in superconducting microelectronic devices for quantum and classical applications. Previously\, he was a member of the Optical Communications T echnology Group\, where he developed superconducting single-photon-detector technology and systems. \; Prior to joining Lincoln Laboratory in 2004 \, he was a postdoctoral researcher at the MIT/Harvard Center for Ultracold Atoms\, as well as at the Yale University Physics Department. \; Most recently\, Dr. Kerman has worked on the design of superconducting Josephson -junction-based quantum bits (qubits) and has been developing novel means t o improve their coherence and to generate multiqubit entanglement for quant um information processing. He has also made seminal contributions to the un derstanding and design of superconducting nanowire single-photon detectors (SNSPD) and was responsible for the design and construction of the ground-b ased SNSPD system used in the NASA Lunar Laser Communication Demonstration in 2013. \; Dr. Kerman has authored or coauthored numerous papers on su perconducting devices\, including Josephson-junction-based qubits\, SNSPDs\ , and quantum-phase-slip circuits. He has also published extensively in the areas of laser cooling and trapping of atoms and molecules and cold atomic collisions. \; Dr. Kerman received a BS degree in physics and mathemat ics from Williams College and a PhD degree in physics from Stanford Univers ity.

LAST-MODIFIED:20180316T152342Z LOCATION:Laboratory For Physical Sci\, 8050 Greenmead Dr\, College Park\, M D 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180216T150000Z DTEND:20180216T220000Z DTSTAMP:20260828T094430Z UID:3j74o319nf3bcnmsjld7elreo3@google.com CREATED:20180209T170310Z DESCRIPTION:

University of Maryland Professor and Director of the University's Center for Bioinformatics and Computational Biology (CB CB)\, Eytan Ruppin\, will give a keynote talk entitled\, "Urea cycle dysreg ulation\,  \;pyrimidine biased mutations and enhanced  \;checkpoint inhibitors' response." \; Dr. Ruppin's research focuses on developing and harnessing computational systems biology approaches for the genomic ana lysis and genome scale metabolic modeling (GSMM) of cancer. \; His lab collaborates with several experimental cancer labs\, aiming to utilize comp utational approaches to jointly gain a network-level integrative view of th e systems studied\, and to predict and test novel drug targets and biomarke rs to treat cancer more selectively and effectively.

Researchers from other NIH institutes are welcome to participate in our symposium and colla borate with our UMD colleagues. \; Please join us to learn about our cu rrent UMD graduate students who are performing collaborative research with NIH laboratories. \; We will also have a series of short talks\, a post er session\, and extended break time to allow for discussions of possible j oint research collaborations.

Registration: \;ter.ps/nciumd

LAST-MODIFIED:20180209T170310Z LOCATION:NIH John Edward Porter Neuroscience Research Center (Room 640) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NCI-UMD Partnership for Integrative Cancer Research Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181005T183000Z DTEND:20181005T200000Z DTSTAMP:20260828T094430Z UID:3a7sdv8ptestt7iakur5828g1b@google.com CREATED:20180905T201232Z DESCRIPTION:\nTitle: Anyonic particle-vortex statistics and the nature of d ense QCD\n\nSpeaker: Srimoyee Sen\, University of Washington and Institute for Nuclear Theory\n\nAbstract: Recent theoretical observations have establ ished the presence of Z_3 -valued \nparticle-vortex braiding phases in high density quark matter.\nCertain mesonic and baryonic excitations\, in the p resence of a superfluid vortex\, have orbital angular momentum quantized in units of 1/3. Such non-local topological features can distinguish phases w hose realizations of global symmetries\, as probed by local order parameter s\, are identical. If Z_3 braiding phases and angular momentum fractionaliz ation are absent in lower density hadronic matter\, as is widely expected\, then the quark matter and hadronic matter regimes of dense QCD must be sep arated by at least one phase transition. LAST-MODIFIED:20180914T133941Z SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160418T200000Z DTEND:20160418T210000Z DTSTAMP:20260828T094430Z UID:btig658g789jfcoj57aa2djtnk@google.com CREATED:20160411T141908Z DESCRIPTION:Speaker Name: Moumita Das\n\nSpeaker Institution : RIT\n\nTitle : Modeling the soft mechanics of tissues: How differential physical proper ties at the microscale influence mechanobiology at the macroscale\n\nAbstra ct : Living cells and tissues are highly mechanically sensitive and active. Mechanical stimuli influence the shape\, motility\, and functions of cells \, modulate the behavior of tissues\, and play a key role in several diseas es. In this talk I will discuss how collective biophysical properties of ti ssues emerge from the interplay between differential mechanical properties and statistical physics of underlying components\, focusing on two compleme ntary tissue types whose properties are primarily determined by (1) the ext racellular matrix (ECM)\, and (2) individual and collective cell properties . I will start with the structure-mechanics-function relationships in artic ular cartilage (AC)\, a soft tissue that has very few cells\, and its mecha nical response is primarily due to its ECM. AC is a remarkable tissue: it c an support loads exceeding ten times our body weight and bear 60+ years of daily mechanical loading despite having minimal regenerative capacity. I wi ll discuss the biophysical principles underlying this exceptional mechanica l response using the framework of rigidity\npercolation theory\, and compar e our predictions with experiments done by our collaborators. Next I will d iscuss ongoing theoretical work on how the differences in cell mechanics\, motility\, adhesion\, and proliferation in a co-culture of breast cancer ce lls and healthy breast epithelial cells may modulate experimentally observe d differential migration and segregation. Our results may provide insights into the mechanobiology of tissues with cell populations with different phy sical properties present together such as during the formation of embryos o r the initiation of tumors.\n LAST-MODIFIED:20160411T142010Z LOCATION:0112 CHEM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180306T181500Z DTEND:20180306T191500Z DTSTAMP:20260828T094430Z UID:25meeeiiro4dder3u0be3q057l@google.com CREATED:20180227T135959Z LAST-MODIFIED:20180228T160022Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171114T160000Z DTEND:20171114T171500Z DTSTAMP:20260828T094430Z UID:6q538a7mmjgugqp15iec5qmc4a@google.com CREATED:20170901T151631Z DESCRIPTION:Speaker: Xuedong Hu (University at Buffalo)\n\nTitle: Dynamics and Coherence of a Driven Spin Qubit\n\nAbstract: Research on physical impl ementation of quantum computing has made dramatic \nprogress over the past decade\, spearheaded by superconducting qubits and trapped ion qubits. Stu dies of semiconductor spin qubits\, which have often been considered one of the most promising in terms of scalability\, have lagged behind\, still st ruggling with high-fidelity single- and especially two-qubit gates. In thi s talk I will first present a general discussion of the current status of s pin qubits\, make comparisons between semiconducting and superconducting qu bits\, and try to identify the most important bottlenecks for spin qubits. I will then discuss some of our recent efforts in understanding spin dynam ics and decoherence. One example is a study of implementing an adiabatic p rotocol of spin rotation non-adiabatically\, and obtaining high fidelty res onantly [1]. Another example is a study of Doppler effect in the spin-latt ice relaxation when a spin qubit is being transported [2]\, where we demons trate how spin relaxation is modified by the interplay between Doppler shif t\, quantum confinement\, and phonon density of state.\n\nReferences:\n[1] S. Ou\, X. Hu\, F. Nori\, and S. Kais\, Sci. Rep. 6\, 20824 (2016).\n[2] X. Zhao\, P. Huang\, and X. Hu\, Sci. Rep. 6\, 23169 (2016).​\n\nHost: Robert Throckmorton\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n\nWhen: Tue s\, Nov. 14 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Physics Bldg .)\n LAST-MODIFIED:20171102T174507Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171213T193000Z DTEND:20171213T210000Z DTSTAMP:20260828T094430Z UID:2987cibd4qfq5qmuhoushideof@google.com CREATED:20171107T142231Z DESCRIPTION:Speaker: Tommaso De Lorenzo\n\nSpeaker Insitution: Aix Marseill e University\n\nTitle: Light Cone Thermodynamics\n \nAbstract: In this talk \, I will show that light cones in MInkowski spacetime are a beautiful anal oue of black hole horizons in curved spacetime. To do so\, I will prove the analogue of the four laws of black hole thermodynamics in this setting. Th is is what we called light cone thermodynamics. More precisely\, I will con sider null surfaces defined by the out-going and in-falling wave fronts ema nating from and arriving at a sphere in Minkowski spacetime. Such null surf aces\, made of pieces of light cones\, are bifurcate conformal Killing hori zons for suitable conformally stationary observers. They can be extremal an d non-extremal depending on the radius of the shining sphere. Such conforma l Killing horizons have a constant light cone (conformal) temperature\, giv en by the standard expression in terms of the surface gravity. Considering exchanges of conformally invariant energy across the conformal horizon\, on e can prove\, in perturbation theory\, a first law where entropy changes ar e given by 1/4 of the changes of the area of the bifurcate surface in Planc k units. In the extremal case they become light cones associated with a sin gle event\; these have vanishing temperature as well as vanishing entropy. I will conclude with possible generalisations and applications of such resu lts. LAST-MODIFIED:20171213T185345Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Canceled** Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171026T123000 DTEND;TZID=America/New_York:20171026T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20171026T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker: Jonathan Simon\nUniversity of Maryland | Department of Electrical and Computer Engineering\nTitle: Neural Representation of Speec h in Human Auditory Cortex\nAbstract: We investigate how continuous speech is represented in human auditory cortex. We use magnetoencephalography (MEG ) to record the neural responses of listeners to natural\, continuous speec h\, in a variety of auditory scenes. Systems analysis\, which quantitativel y compares a speech signal to its evoked cortical responses\, allows us to determine the cortical representations of the speech. Interestingly\, the c ortical representation allows the time-varying envelope of the speech to be reconstructed from the observed neural response to the speech. We find tha t cortical representations of continuous speech are very robust to interfer ence from competing speakers\, and many other kinds of noise\, consistent w ith our ability to understand speech even in a noisy room (the "Cocktail Pa rty" problem). Indeed\, individual neural representations of the speech of both the foreground and background speaker are observed\, with each being s electively time-locked to the rhythm of the corresponding speech\, but the with the foreground speech represented more faithfully than the background. LAST-MODIFIED:20170911T175957Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170203T180000Z DTEND:20170203T190000Z DTSTAMP:20260828T094430Z UID:04ciqg8dgh0dv2lmm6cs4lnmu4@google.com CREATED:20170123T201602Z DESCRIPTION:Speaker Name: John Arnold - Professor\, Department of Chemistry \n\nSpeaker Institution: University of California\, Berkeley\n\nTitle: Acti nide Chemistry and its Role in Uranium Extraction from Seawater.\n\nAbstrac t: Estimates of the total mass of uranium in seawater are on the order of 4 .5 billion tons\, one thousand times that present in terrestrial ores (the total ocean volume is approximately 1.4 x 109 km3\; uranium is present at c a. 3 ppb). i Despite this abundance\, there are several major impediments t o using uranium from seawater as a viable economic source. First\, the conc entration of uranium is very low\; second\, there are relatively high conce ntrations of other ions that interfere with uranium separation\; and third\ , the volumes involved are extremely high. \n\nOur research is aimed at dev eloping our fundamental understanding of how donor ligands bind to the uran yl ion\, UO22+\, with the longer-term goal of using this information to tac kle the selective recognition of uranyl in aqueous solution. The results of these studies will impact the science and technology underlying our approa ches to controlling the behavior of uranium in these systems\, and will lea d to a fundamental change in how scientists formulate models of bonding for uranyl. \n\nThis presentation will focus on new results in our search for new chemistry involving the actinide elements: Th\, U\, and Np. A specific emphasis will be placed on new chemistries aimed at selective extraction of U from seawater.\n\nFor additional info\, visit:http://www.mse.umd.edu/eve nts/seminars LAST-MODIFIED:20170126T193033Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161025T200000Z DTEND:20161025T210000Z DTSTAMP:20260828T094430Z UID:4td8lf8s9ssmueo0n9r9shg24o@google.com CREATED:20160927T152411Z DESCRIPTION:Speaker Name: Eli Yablonovitch\n\nSpeaker Institution: Univers ity of California\, Berkeley\n\nTitle: A New Type of Heat Engine\, Using L EDs as Refrigerators\n\nAbstract: Very efficient light emitting diodes (LE Ds) actually become colder as they operate because the emitted light carrie s away entropy. This surprising effect requires superb LED efficiency\, wh ich is achieved by using 2D photonic crystal structures to extract the lumi nescence. 2D photonic crystals have likewise been employed in photovoltaic cells to trap incident light. We now know that the photovoltaic cell and the LED are reciprocals of one another. The maxim that “a great solar cell has to be a great LED” has led to solar cells with record efficiency.\n\nWh at if the electrical output of a photovoltaic cell drives an LED\, and the LED light in turn drives the photovoltaic cell? You might fear that it wou ld become a perpetual motion machine. Instead it becomes a heat engine in w hich a small amount electricity can efficiently provide refrigeration\, or conversely a small temperature difference can generate electricity. Such an electro-luminescent heat engine\, in which photons are the working fluid\, can be more efficient than thermo-electrics\, in which electrons are the w orking fluid. LAST-MODIFIED:20161011T142550Z LOCATION:PHYS Room 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Paint Branch Lecture/Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171115T160000Z DTEND:20171115T170000Z DTSTAMP:20260828T094430Z UID:23o8vbm1q422e8kokl9jtvnd7t@google.com CREATED:20171018T132541Z DESCRIPTION:Speaker: R. Bruce Weisman\, Department of Chemistry\, Rice Univ ersity\, Houston\, Texas\n\nTitle: Fluorescence of Single-Walled Carbon Nan otubes: From Discovery to Applications\n\nAbstract:Single-walled carbon nan otubes (SWCNTs) are a family of artificial nanostructures with unique physi cal and chemical properties that have inspired extensive basic and applied research. Most structures of SWCNTs are semiconducting and show direct band gap photoluminescence (fluorescence) at characteristic wavelengths in the short-wave infrared. Each structural form of SWCNT displays a characteristi c spectral signature that provides a powerful basis for qualitative identif ication and quantitative analysis. Fluorescence from SWCNTs is also very ro bust\, allowing steady emission during long periods of intense irradiation. This enables individual SWCNTs to be imaged and studied in a variety of en vironments\, including liquid suspensions\, polymeric hosts\, and biologica l tissues. The discovery and spectral assignment of SWCNT short-wave infrar ed fluorescence will be described. Examples will then be presented showing how this effect has led to improved sample characterization\, studies of ph otophysical properties and phenomena\, and emerging applications in biomedi cine and engineering. LAST-MODIFIED:20171018T132541Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170308T210000Z DTEND:20170308T223000Z DTSTAMP:20260828T094430Z UID:vkoai42rul78i9092f5mtsntp0@google.com CREATED:20170305T204044Z DESCRIPTION:SPEAKER\; David Haviland\, KTH Stockholm\n\nTITLE: Reconstruc ting Nonlinearity with Intermodulation Spectroscopy\n\nABSTRACT: This talk will describe the use of frequency combs to probe nonlinear oscillations. High Q resonators are frequently applied in precision measurement\, where the system of interest is probed by measuring how it perturbs the dynamics of the resonator. Often this perturbation is nonlinear. Driving the nonli near resonator with two our more pure tones creates many high-order intermo dulation (frequency mixing) products near resonance\, where the nonlinear r esponse can be measured with high signal-to-noise ratio. A remarkably simp le method exists for extraction of the parameters the nonlinear perturbatio n\, from a phase-coherent measurement of many intermodulation products. A key aspect of the multi-frequency lock-in measurement technique is the ‘tun ing’ of the multiple drive and listening tones. The intermodulation spectr al method will be discussed in the context of two applications: Dynamic AF M and measurement of surface forces\, and cluster-state generation in nonli near superconducting circuits.\n\nHOST\; Steve Anlage LAST-MODIFIED:20170305T204146Z LOCATION:CNAM CONF RM: 0360 John S. Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM SPECIAL SEMINAR: David Haviland\, KTH Stockholm TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161026T190000Z DTEND:20161026T200000Z DTSTAMP:20260828T094430Z UID:t2dps21gbdj9m49anmmbr01guc@google.com CREATED:20161020T143017Z DESCRIPTION:Speaker Name: Dr. Steven R. Best\n\nSpeaker Institution : MITRE Corporation\, Bedford MA\n\nTitle: Recent Trends in Electrically Small An tenna Design\n\nAbstract : In this presentation we review the fundamental c hallenges and limitations associated with designing electrically small\, si ngle band and multiband antennas. We present fundamental performance limits that apply to all small antenna designs. We also discuss a number of pract ical techniques that facilitate the tuning and impedance matching of these antennas. This presentation discusses the design and performance properties of a number of small dipole\, monopole\, loop\, inverted-L\, inverted-F (I FA) and Planar Inverted-F (PIFA) antennas. LAST-MODIFIED:20161020T143417Z LOCATION: LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180509T193000Z DTEND:20180509T203000Z DTSTAMP:20260828T094430Z UID:3kjhpqim77dl6p3r9rtr90nlam@google.com CREATED:20180504T191803Z DESCRIPTION:\nSpeaker Name: Dr. Fatima Ebrahimi\n\nSpeaker Institution : Pr inceton Plasma Physics Laboratory\n\nTitle : Onset and nonlinear relaxation of coherent current-carrying edge filaments during transient events in tok amaks\n\nAbstract : The onset and nonlinear evolution of coherent current-c arrying filaments are examined using global nonlinear three dimensional res istive MHD simulations in a spherical tokamak (ST). We show that physical c urrent sheets/layers develop near the tokamak edge under different circumst ances\, in particular as a peeling component of ELMs (due to bootstrap curr ents)\, and during vertical displacement events (associated with the scrape -off layer currents). In all these cases\, edge current sheets can become u nstable to nonaxisymmetric 3-D current-sheet instabilities and nonlinearly form edge coherent current-carrying filaments. Time-evolving edge current s heets in ST configurations are identified in our nonlinear simulations. [F. Ebrahimi\, Phys. Plasmas 23\, 120705 (2016)\;24\, 056119 (2017)] In the ca se of peeling-like edge localized modes\, the longstanding problem of quasi periodic ELM cycles is explained through the relaxation of the edge current source through direct numerical calculations of reconnecting local bi-dire ctional fluctuation-induced electromotive force (emf) terms. Second\, we ex amine the stability and formation of reconnecting edge peeling-driven filam ents during induced vertical displacement events (VDEs) simulations. Simila r to fast reconnection due to axisymmetric plasmoids\, [F. Ebrahimi and R. Raman\, Phys. Rev. Lett. 114\, 205003 (2015)] we find that the growth rate of these edge filamentary structures becomes independent of Lundquist numbe r. As well as edge reconnection physics in tokamaks\, the 3-D coherent curr ent-carrying fi lament structures and their nonlinear dynamics due to the d ynamo effect presented here are also relevant to flares\, which also exhibi t ejection of field-aligned filamentary structures into the surrounding spa ce. LAST-MODIFIED:20180504T192020Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160916T160000Z DTEND:20160916T170000Z DTSTAMP:20260828T094430Z UID:obehbq7qea0ckm2nb8e3o8osok@google.com CREATED:20160909T205151Z DESCRIPTION:JQI-QuICS-CMTC Lunch Seminar\n\nFriday\, September 16\, 2016 - 12:15pm (Free lunch served at 12:00pm)\n\nTitle:Multi-Species Trapped Ion Modules for Large Scale Quantum Computers\n\nSpeaker Name: Volkan Inlek\n\n Speaker Institution: JQI \n\nAbstract:\n \nTrapped atomic ions have proven to be among leading platforms on quantum information processing\, with thei r long coherence times and high fidelity quantum operations. Scaling up to larger numbers of qubits is a remaining challenge\; and a modular network of many ion traps with photonic interfaces is a promising solution. In thi s architecture\, external fields can drive local entangling gates between q ubits within a module. Connections throughout the network can be achieved v ia probabilistic photonic entanglement between qubits in different modules. If all ions are the same species\, resonant light scattered by photonic co nnection qubits can be absorbed by neighboring memory qubits and corrupt th e stored information. To address this issue\, we have implemented co-trappi ng of two different atomic species in the same ion trap: 171Yb+ for quantum information storage and 138Ba+for intermodular connection. In this talk\, I will present our experimental results towards realization of this multi-s pecies modular network architecture. LAST-MODIFIED:20160914T203317Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171206T160000Z DTEND:20171206T170000Z DTSTAMP:20260828T094430Z UID:0p7dgjfkda1kfajfg4sadgouqf@google.com CREATED:20171201T152628Z LAST-MODIFIED:20171201T152653Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161114T210000Z DTEND:20161114T220000Z DTSTAMP:20260828T094430Z UID:lggce7ruhr3oppthqn66fifphc@google.com CREATED:20161108T173300Z DESCRIPTION:Speaker Name: Gregory Both\n\nSpeaker Institution : University of Chicago\n\nTitle : Theory and Simulation of Biomolecular Systems: The Mu ltiscale Challenge\n\nAbstract : A multiscale theoretical and computational methodology will be discussed for studying biomolecular systems across mul tiple length and time scales. The approach provides a systematic connection between all-atom molecular dynamics\, coarse-grained modeling\, and mesosc opic phenomena. At the heart of the approach is a method for deriving coars e-grained models from protein structures and their underlying molecular-sca le interactions. This particular aspect of the work has strong connections to the theory of renormalization\, but it is more broadly developed and imp lemented for heterogeneous biomolecular systems. A critical component of th e methodology is also its connection to experimental structural data such a s cryo-EM or x-ray\, thus making it “hybrid” in its character. Applications of our multiscale simulation approach to elaborate key features of complex processes such as the HIV virus capsid assembly and protein-mediated membr ane remodeling will be presented as time allows.\n LAST-MODIFIED:20161108T173357Z LOCATION:0112 Chem SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180920T123000 DTEND;TZID=America/New_York:20180920T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20180920T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Statistical Description of Hamiltonian Mixed Phase Space Systems\nSpeaker: Prof. Shmuel Fishman\nTechnion University Department of Physics\nAbstract: Typical physical systems follow deterministic behavior. This behavior can be sensitive to initial conditions\, such that it is very difficult to predict their behavior in the longtime limit. The resulting m otion is chaotic and looks stochastic or random. In many cases the motion i s described by a Hamiltonian and the energy is conserved. The motion can be also regular\, that is predictable. In the work reported here we studied systems where depending on initial conditions the motion is either regular or chaotic. The simplest systems of this type are of two degrees--of--free dom\, or periodically kicked systems with one degree--of--freedom. For this type of systems transport in the chaotic regions of phase space is dominat ed by sticking to complicated structures in the vicinity of the regular reg ion. The probability to stay in the vicinity of the initial point is a powe r law in time characterized by some exponent. The question of the value of this exponent and its universality is the subject of a long controversy. We have developed a statistical description for this type of systems\, where statistics are with respect to parameter or family of systems rather than t o initial conditions. Following previous studies\, it is based on a scaling of periodic and quasi-periodic orbits in a way which relies heavily on num ber theory. We have found an indication that the statistics of scaling is p arameter independent and might be relevant for a wider universality class i ncluding the systems we explored. This statistical description is implement ed in a stochastic Markov model proposed by Meiss and Ott in 1986. Even tho ugh many approximations are used\, it predicts important results quantitati vely\, showing the power law decay exponent to be approximately 51.57 in ag reement with direct simulations done in this work and also other works. Its universality is inferred from the universality of the scaling statistics. The model systems used in this work are paradigms for chaotic dynamics (the H'enon map and the standard map) therefore it might indicate a wider unive rsality class. Quantum manifestation of this phenomenon and its relevance f or time correlations\, is showing different behavior for increasing effecti ve Planck's constant\, namely\, the Planck's constant divided by the typica l action. By using recent results regarding the universality of wave functi on transmission across barriers in phase space\, we generalize the use of t he Markov model to describe the results after some modification.\n\nThe wor k reported was done in collaboration with Or Alus\, James Meiss and Mark Sr ednicki LAST-MODIFIED:20180911T145416Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160624T180000Z DTEND:20160624T193000Z DTSTAMP:20260828T094430Z UID:lsgbcpqkvjtfsgre85vkls0234@google.com CREATED:20160519T132907Z DESCRIPTION:Speaker Name: Julian Heeck\n\nSpeaker Institution: Université L ibre de Bruxelles\n\nTitle: Phenomenology of Left-Right Symmetric Dark Matt er\n \nAbstract: We show that left-right symmetric models can easily accomm odate stable TeV-scale dark matter particles without the need for an ad-hoc stabilizing symmetry. Stability of new fermion or scalar multiplets is ens ured by an accidental matter parity that survives the spontaneous symmetry breaking of the gauge group by scalar triplets. The relic abundance of thes e particles is set by gauge interactions and gives rise to dark matter cand idates with masses above the electroweak scale. Dark matter annihilations a re thus modified by the Sommerfeld effect\, not only in the early Universe\ , but also today\, for instance\, in the Center of the Galaxy. Majorana can didates - triplet\, quintuplet\, bi-doublet\, and bi-triplet - bring only o ne new parameter to the model\, their mass\, and are hence highly testable at colliders and through astrophysical observations. In particular\, they a ll predict a large gamma-ray flux from dark matter annihilations\, which ca n be searched for with Cherenkov telescopes. LAST-MODIFIED:20160608T192830Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - Phenomenology of Left-Right Symmetric Dark Matter TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171024T160000 DTEND;TZID=America/New_York:20171024T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171024T160000 CREATED:20170809T180226Z DESCRIPTION:Paint Branch Lecture (in 1412\, Toll Physics Bldg.)\n\nDave Win eland\, NIST/U. Oregon\n\nResearch on precise control of coherent quantum s ystems occurs in many laboratories throughout the world\, for fundamental r esearch\, new measurement techniques\, and more recently for the developmen t of quantum computers. I will briefly describe experiments on these topics using trapped ions at the National Institute of Standards and Technology ( NIST) but these just serve as examples of similar work being performed with many other atomic\, molecular\, optical (AMO) and condensed matter systems . This talk is\, in part\, the “story” of my involvement in these subjects which began when I entered graduate school.\n\n \n\n LAST-MODIFIED:20171010T154549Z LOCATION:1412\, Toll Physics Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180216T180000Z DTEND:20180216T190000Z DTSTAMP:20260828T094430Z UID:775rs014nu9fm30iin3pbfr9et@google.com CREATED:20180215T155738Z DESCRIPTION:Speaker: Alan Nakatani\, Sr. Research Scientist\, Dow Ch emical Company

Title: Concentration Dependence of Polymer Ads orption on Clay Surfaces by Small angle Neutron Scattering

Abstra ct: \;Understanding the basis of polymer adsorption behavior on ino rganic surfaces is critical in a variety of industrial applications\, inclu ding water treatment\, pigmented architectural coating formulations\, cemen t formulations\, and pulp and paper manufacture. To further the understandi ng of the adsorption process\, the adsorption behavior of select polymers o f varying molecular weights onto a model clay surface in aqueous formulatio ns is studied as a function of polymer concentration by small angle neutron scattering (SANS). The model clay used in the study is Laponite™\, which h as a well-defined disk-like morphology and narrow distribution of platelet sizes. The SANS results were fit using a core-shell cylinder model allowing extraction of the adsorbed polymer layer dimensions on both the radial and face of the clay particles. \; The polymer layer thickness and density were found to depend on the polymer concentration\, progressively adsorbin g onto the radial and then facial locations of the clay particles. The resu lts are compared with other studies of polymer adsorption onto surfaces and put in context with existing theories for polymer adsorption. LAST-MODIFIED:20180215T155738Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171017T160000 DTEND;TZID=America/New_York:20171017T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171017T160000 CREATED:20170809T180226Z DESCRIPTION: Shih-I Pai Lecture (in 1412\, Toll Physics Bldg.)\n\nDanielle Bassett\, University of Pennsylania\n\nPerturbation and Control of Human Br ain Network Dynamics\n\n The human brain is a complex organ characterized b y heterogeneous patterns of interconnections. New non-invasive imaging tech niques now allow for these patterns to be carefully and comprehensively map ped in individual humans\, paving the way for a better understanding of how wiring supports our thought processes. While a large body of work now focu ses on descriptive statistics to characterize these wiring patterns\, a cri tical open question lies in how the organization of these networks constrai ns the potential repertoire of brain dynamics.\n\nIn this talk\, I will des cribe an approach for understanding how perturbations to brain dynamics pro pagate through complex writing patterns\, driving the brain into new states of activity. Drawing on a range of disciplinary tools – from graph theory to network control theory and optimization – I will identify control points in brain networks\, characterize trajectories of brain activity states fol lowing perturbation to those points\, and propose a mechanism for how netwo rk control evolves in our brains as we grow from children into adults. Fina lly\, I will describe how these computational tools and approaches can be u sed to better understand how the brain controls its own dynamics (and we in turn control our own behavior)\, but also how we can inform stimulation de vices to control abnormal brain dynamics\, for example in patients with sev ere epilepsy.\n\n LAST-MODIFIED:20171012T144946Z LOCATION:1412\, Toll Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170419T150000Z DTEND:20170419T160000Z DTSTAMP:20260828T094430Z UID:7s7v9o5m0oq24v9fpq27l8if2c@google.com CREATED:20170406T125751Z DESCRIPTION:Speaker: Matthew McKague\n\nSpeaker Affiliation: Queensland Uni versity of Technology\n\nTitle: Quantum Self-testing\n\nAbstract: Quantum s elf-testing is a tool that can allow us to test the honesty of quantum devi ces without needing to have access to any trusted quantum devices. Through classical information alone (measurement settings and outcomes\, for examp le) we can verify that quantum devices are operating according to some spec ification\, even if we have no information on how the devices are construct ed. Self-testing can be used to test sources\, measurements\, and even ent ire quantum computations. In this talk I will go over the basics of self-t esting and discuss some known self-tests and applications.\n LAST-MODIFIED:20170410T124819Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170429T160000Z DTEND:20170429T170000Z DTSTAMP:20260828T094430Z UID:C2B6F188-3EBF-4E73-9164-0991B1DA90B9 CREATED:20170426T202244Z DESCRIPTION:Speaker Name: Dist. Univer. Prof. Raman Sundrum and Dr. David C urtin\n\nSpeaker Institution: UMD\n\nTitle: “Recreating the Big Bang …. Ag ain and Again and Again”\n\nAbstract: Where did all the Matter in the Unive rse come from\, all the atoms making up people\, planets and stars\, as wel l as the more mysterious non-atomic Dark Matter? The answer hinges on the “ war” of annihilation between Matter and Antimatter soon after the Big Bang\ , but the precise story at first seems lost in the ancient past. Fortunatel y\, modern particle physics experiments\, such as the CERN Laboratory’s Lar ge Hadron Collider outside Geneva\, are able to recreate some of the extrem e conditions of the very early Universe. We will introduce you to some of t he latest theoretical ideas and experimental innovations\, developed at the University of Maryland and elsewhere\, that might allow us to replay the f irst key instants of creation to find out just what happened. LAST-MODIFIED:20170428T130057Z LOCATION:John S. Toll Physics Building Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MD Day talk by Raman Sundrum and David Curtin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161028T161500Z DTEND:20161028T171500Z DTSTAMP:20260828T094430Z UID:2k7ar98qoc918s97g9k29qq02o@google.com CREATED:20161019T151817Z DESCRIPTION:Speaker Name: Jim Garrison\n\nSpeaker Institution: JQI/QuICS\n\ nTitle: Partial breakdown of quantum thermalization in a Hubbard-like model \n\nAbstract: We study the possible breakdown of quantum thermalization in a model of itinerant electrons on a one-dimensional chain without disorder\ , with both spin and charge degrees of freedom. The eigenstates of this mod el exhibit peculiar properties in the entanglement entropy\, the apparent s caling of which is modified from a "volume law" to an "area law" after perf orming a partial\, site-wise measurement on the system. These properties an d others suggest that this model realizes a new\, non-thermal phase of matt er\, known as a quantum disentangled liquid (QDL). The putative existence o f this phase has striking implications for the foundations of quantum stati stical mechanics.\n\nThe talk will be based on arXiv:1606.05650. LAST-MODIFIED:20161019T151817Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171211T210000Z DTEND:20171211T220000Z DTSTAMP:20260828T094430Z UID:0klo59fc6mb8gn1i5kef4qk264@google.com CREATED:20171201T201955Z DESCRIPTION:Speaker Name: Jonathan Sachs\n\nSpeaker Institution : Universit y of Minnesota\n\nTitle : Alpha-Synuclein biophysics: membranes\, fibrils a nd disease\n\nAbstract : In this seminar\, I will provide an overview of ou r work on alpha-Synuclein biophysics. Our work combines computational model ing with experimental studies to understand aspects of the protein that are thought to underlie its role in Parkinson’s disease. In particular\, I wil l describe our findings regarding the impact of the protein on membrane cur vature and vesicle mechanics\, as well as the phase behavior of membranes. I will also discuss our findings regarding Synuclein’s interaction with cur vature inducing lipids in the mitochondria. Then\, I will present our most recent study of Synuclein fibrils\, a computational analysis of the thermod ynamic stability of the first Synuclein fibril structure\, which was publis hed last year.\n\nNotes: http://www.marylandbiophysics.umd.edu/ LAST-MODIFIED:20171201T202133Z LOCATION: Location: 0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160915T193000Z DTEND:20160915T203000Z DTSTAMP:20260828T094430Z UID:0ljj3n4hu89knpu4djophiovts@google.com CREATED:20160915T165031Z DESCRIPTION:Speaker: Chuck Doran (U. Alberta and UMD) LAST-MODIFIED:20160915T165031Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to homological mirror symmetry and the SYZ conjecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171023T110000 DTEND;TZID=America/New_York:20171023T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171023T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Sean Hartnoll\, Stanford\nTitle: Fundamental bounds o n transport\nAbstract: There is a long history to the idea that transport m ay be subject to fundamental constraints. I will argue that a variant of th ese ideas offers promising ways to think about transport in unconventional metals such as high temperature superconductors. I will discuss both propos ed lower and upper bounds on transport\, and I will suggest that such bound s may address long-standing transport puzzles in unconventional metals. I w ill discuss recent experimental probes of these ideas as well as theoretica l connections to questions in quantum statistical mechanics. LAST-MODIFIED:20171019T182639Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161019T150000Z DTEND:20161019T163000Z DTSTAMP:20260828T094430Z UID:233hvrsu1oib7g0et40ru6e1vo@google.com CREATED:20160926T162146Z DESCRIPTION:Speaker: Oleksandr Tomalak\n\nSpeaker Institution: Mainz Univer sity\n\nTitle: "Two-photon exchange corrections in elastic lepton-proton sc attering"\n\nAbstract: In recent years\, elastic electron-proton scattering experiments\, with and without polarized protons\, gave strikingly differe nt results for the electric over magnetic proton form factor ratio. A myste rious discrepancy ("the proton radius puzzle") has been observed in the mea surement of the proton charge radius in muon spectroscopy experiments versu s electron spectroscopy and electron scattering. Two-photon exchange (TPE) contributions are the largest source of the hadronic uncertainty in these e xperiments. We estimate the forward Compton scattering subtraction function and corresponding correction to the Lamb shift of 2S level in muonic hydro gen from the proton structure function data in high-energy and resonance re gions. We also compare the existing models of the elastic contribution to T PE correction in lepton-proton scattering. A subtracted dispersion relation formalism for the TPE in electron-proton scattering has been developed and tested. Its relative effect on cross section is in the 1-2% range for a lo w value of the momentum transfer. For the inelastic TPE contribution\, the low momentum transfer expansion was studied\, and a good agreement with the experimental TPE fit to electron data was found. We compare the resulting TPE with VEPP-3 and CLAS data and give predictions in OLYMPUS kinematics an d for a forthcoming muon-proton scattering experiment (MUSE). LAST-MODIFIED:20160928T133338Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170421T200000Z DTEND:20170421T230000Z DTSTAMP:20260828T094430Z UID:avf2ua8i4jvfjmsh5stkp1adbs@google.com CREATED:20170412T162820Z DESCRIPTION:GRAD-MAP Spring Symposium\, 11:30AM - 5:30 PM. Talks and poster sessions in\nsupport of GRAD-MAP’s mission for inclusive science. \nGRAD-M AP symposium & March Prep 4-7pm \nLet’s get ready to march! We will make si gns and distribute information for\nthose participating. Plus\, get in cont act with our student groups and\nlearn how you can get involved.\n\nFlyer: https://drive.google.com/file/d/0Bz4x8ufYIK7fX1RKOTJIQWZxNUU/view?usp=shari ng LAST-MODIFIED:20170412T163842Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Civic Engagement Week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180214T210000Z DTEND:20180214T223000Z DTSTAMP:20260828T094430Z UID:5r2234gb5khi87pgre2lq3226u@google.com CREATED:20180212T181349Z DESCRIPTION:Speaker Name: Patrick Spradlin\n\nSpeaker Institution: Univer sity of Glasgow\n\nTitle: Doubly charmed baryons and the discovery of Xi_c c++ at LHCb\nAbstract: In the summer of 2017\, LHCb announced the discover y of the doubly charmed baryon Xi_cc++\, which was the first definitive obs ervation of a baryon containing two heavy flavored quarks. This result bec ame the most widely publicized result from the LHC in 2017. This seminar w ill discuss the physics of doubly heavy baryons\, the controversial history of experimental searches for them\, and LHCb’s recent discovery of Xi_cc++ . LAST-MODIFIED:20180212T181836Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170202T183000Z DTEND:20170202T193000Z DTSTAMP:20260828T094430Z UID:skf6ell2n87rq1j10vt01b0j3s@google.com CLASS:PUBLIC CREATED:20170124T135507Z DESCRIPTION:Speaker: Michael Goldman\, Harvard U.\n\nTitle: Nature’s Own Tr apped Atom: Coherent Optical Control of the Nitrogen-Vacancy Center\n\nAbst ract: The nitrogen-vacancy (NV) center\, an atom-like defect in diamond\, has emerged as a promising platform for applications in quantum information science and quantum metrology. NV centers can be manipulated much like sin gle trapped atoms. We can address them individually using optical microscop y\, control their electronic spin using microwave radiation\, and drive coh erent optical transitions\, at cryogenic temperatures\, between electronic orbital states. However\, the fact that an NV center is surrounded not by vacuum but by a solid diamond lattice presents both experimental challenges and interesting opportunities. \nWe use the NV center’s atom-like properti es to probe its interactions with the diamond lattice. I will describe how phonons\, quantized lattice vibrations\, can negatively impact our ability to drive coherent optical transitions but also enable a wide range of metr ology applications under ambient conditions. I will also discuss our recen t efforts to optically manipulate nuclear spins embedded in the diamond lat tice. LAST-MODIFIED:20170124T135507Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161107T160000Z DTEND:20161107T170000Z DTSTAMP:20260828T094430Z UID:23g3i0alkq8kfjdsig1ros04uo@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.23g3i0alkq8kfjd sig1ros04uo CREATED:20161102T131435Z DESCRIPTION:Note: Each presentation is allocated 25 minutes plus 5 minutes for discussion.\n \nPt. 1: Effective Field Theory for Strongly Correlated P hotonic Matter\nSpeaker: Michael Gullans\nAbstract: \nA promising route to scaling up quantum information systems is to strongly couple light\, or oth er propagating quantum fields\, to localized electronic degrees of freedom in solids or trapped atoms. Describing the emergent non-equilibrium behavi or of such strongly coupled light and matter is an outstanding challenge fo r theoretical physics and quantum information science. A simplifying featu re of these systems\, however\, is that they are often characterized by a l arge separation of scales between the atomic and photonic degrees of freedo m. In this talk\, I will discuss recent results where we took advantage of this separation of scales to develop an effective field theory description of interacting photons in cold gases of Rydberg atoms\, where the photons become dressed with highly excited Rydberg states. This theoretical approa ch is analogous to semiclassical nonlinear optics\, where the electronic de grees of freedom are integrated out to give rise to effective photon-photon interactions. As an application of this theory\, I will show how such Ryd berg polariton systems may provide new insights into universality in few-bo dy quantum systems. \n \nPt. 2: Frontiers of Photon Counting: From Quantum Mesoscopic States To Ultra-Low Intensities\nSpeaker: Ivan Burenkov\nAbstrac t:\nResponding to the needs of practical quantum information processing muc h effort is directed towards engineering and characterizing a suite of scal able and hybrid quantum tools. We combine the latest advances in source eng ineering\, detector development\, and advanced measurement techniques to re construct the mode structure and optical losses of multimode mesoscopic opt ical fields using an experimentally measured joint photon-number probabilit y distribution. We also characterize an efficient and inherently ultra-low noise frequency conversion via a parametric sum frequency generation. This upconverter generates only 100 background photons per hour. To measure such a low rate\, we introduced a dark count reduction for a transition edge se nsor.\n \n\nJoin with Google Hangouts: https://plus.google.com/hangouts/_/c alendar/bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmN vbQ.23g3i0alkq8kfjdsig1ros04uo?hs=121 LAST-MODIFIED:20161102T131435Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170427T150000Z DTEND:20170427T160000Z DTSTAMP:20260828T094430Z UID:30kjqd25oanqo1m8oc3h3im674@google.com CREATED:20170418T143002Z DESCRIPTION:Speaker Name: Dr. Melissa Pesce-Rollins\n\nSpeaker Institution : INFN-Pisa\n\nTitle : "Fermi Large Area Telescope Observations of High-ene rgy Gamma-ray Emission from Solar Flares"\n\nAbstract : The Fermi Large Are a Telescope (LAT) observations of the active Sun provide the largest sample of detected solar flares with emission greater than 30 MeV to date. These include detections of impulsive and sustained emission\, extending up to ~2 0 hours in the case of the 2012 March 7 X-class flares. These high-energy f lares are coincident with GOES X-ray flares of X\, M and C classes as well as very fast Coronal Mass Ejections (CME). I will present results from the First Fermi-LAT solar flare catalog covering the majority of Solar Cycle 24 including correlation studies with the associated Solar Energetic Particle s (SEP) and CMEs.\n\n LAST-MODIFIED:20170425T144054Z LOCATION: PSC 1136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170208T200000Z DTEND:20170208T210000Z DTSTAMP:20260828T094430Z UID:66997877-05D1-4635-904B-F5A70702BFA8 CREATED:20170201T174222Z DESCRIPTION:Title : Quantum Optical Physics: the Bottom-Up Approach\nSpeake r Name: Prof. Min Ouyang\nSpeaker Institution : University of Maryland\, Co llege Park\n\nAbstract : In this talk I will present a few recent advances from my group\, centering on new interface between ultrafast quantum optics and nanoscience through bottom-up materials design. I will particularly fo cus on development of emerging colloidal hybrid nanostructures that can all ow desirable integration of multifunctionality in one single nanoscale unit to create novel synergistic interactions at the nanoscale. By combining ul trafast optical spectroscopy with this new materials advance\, precise cont rol of a few fundamental quantum processes involving spin and phonons can t hus be achieved. For example\, spin manipulation and spin echo will be demo nstrated using light-matter interactions in hybrid semiconductor quantum na nostructures\, which is crucial for the development of emerging nanoscale q uantum devices with optimum performance. Potential applications of such bot tom-up approaches will be also described.\n LAST-MODIFIED:20170201T174223Z LOCATION:LPS Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161021T161500Z DTEND:20161021T171500Z DTSTAMP:20260828T094430Z UID:8ivr7vlvcqh9i0oakv4elsqgos@google.com CREATED:20161012T135724Z DESCRIPTION:Speaker: Shelby Kimmel\n\nSpeaker Affiliation: QuICS\n\nTitle: What does the effective resistance of electrical circuits have to do with q uantum algorithms?\n\nAbstract: I will answer the question in the title. I will also describe a new quantum algorithm for Boolean formula evaluation a nd an improved analysis of an existing quantum algorithm for st-connectivit y. Joint work with Stacey Jeffery. LAST-MODIFIED:20161012T135846Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161031T200000Z DTEND:20161031T210000Z DTSTAMP:20260828T094430Z UID:k8bfp4qr8q6vu6cposiknvp3fg@google.com CREATED:20161028T012225Z DESCRIPTION:Speaker Name: Dr. Arun Yethiraj\n\nSpeaker Institution : Univer sity of Wisconsin-Madison\n\nTitle : Self-Assembly in Complex Fluids\n\nAbs tract : The self-assembly of molecules into complex structure is ubiquitous in biology and materials science. In this talk I will discuss two classes of molecules: lipid meso-phases in the presence of anti-microbial peptides and the lyotropic liquid crystalline phases of Gemini surfactants. In the f ormer specific interactions between the peptides and lipids causes lipid se gregation and the formation of curved interfaces. In the latter the phases formed are sensitive to a host of features. Using computer simulation we sh ow that both non-electrostatic and electrostatic interactions play an impor tant role in the self-assembly of these systems\, and both are promising ca ndidates for chemistry directed self-assembly. LAST-MODIFIED:20161028T012225Z LOCATION:0112 CHEM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180430T203000Z DTEND:20180430T213000Z DTSTAMP:20260828T094430Z UID:7gtn9720j6q1bpi4t8657gmgls@google.com CREATED:20180419T192819Z DESCRIPTION:Speaker Name: \;Natalia Buzulukova

Speaker \;Institution: NASA Goddard Space Flight Center

Title: \;E xtreme Space Weather Events and Their Effects and Impacts

Abstract:& nbsp\;In the modern technological society\, many critical infrastructure sectors are vitally dependent from the state of the Space Weather. Recentl y\, several studies have shown that a severe space weather event (e.g. geom agnetic storm) can cause considerable damage to the engineered systems and infrastructure. Examples include the impact on electric power grids and rai lway networks\, the ionosphere and the satellite communications including G NSS systems\, satellite surface/internal charging effects\, the effects of radiation including effects on aviation and human exploration. There are co ntroversies and debates on how to define extreme events\, how to estimate t heir economical effects and how to predict their occurrence in the future. In this talk\, we outline major effects and impacts of extreme space weathe r and elaborate on definition of extremes. We discuss geomagnetic storms an d give examples of extremes outlining current status of predictions and mod eling tools. In addition\, we show some examples when serious adverse effec ts can happen during modest geomagnetic storms. Discussion of challenges an d future directions will conclude the talk.


Notes: \;Coffee\, Tea and Snacks 4:15 - 4:30 LAST-MODIFIED:20180419T192819Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180926T200000Z DTEND:20180926T213000Z DTSTAMP:20260828T094430Z UID:0qp5mb7i1q363mg36kvbfuligc@google.com CREATED:20180921T135914Z DESCRIPTION:Title : The Active Veto of the Large Underground Xenon Detector and the Study of Muons Deep Underground\n\nSpeaker: Douglas Tiedt\, Univ erstiy of Maryland\n\nAbstract: Cosmological observations of the universe find a stark mismatch between the expected\nlevels of visible matter and th e state of the universe. Rotational velocities of galaxies\,\ninteractions of galaxy clusters\, and the cosmic microwave background (CMB) all point to the\nexistence of some kind of ``dark matter" that primarily interacts gra vitationally. One theory for\nthe nature of this matter is the Weakly Inter acting Massive Particle (WIMP)\, whose existence is\npredicted both by exte nsions to the particle physics standard model\, and by straightforward\nthe rmodynamic arguments following the expansion and cooling of the early unive rse.\nThe search for dark matter in our labs has become critical in order t o understand its true\nnature. The Large Underground Xenon (LUX) dark matte r detector operated at the Sanford\nUnderground Research Facility (SURF) fo r several years until it was decommissioned in 2016. It\nwas a two-phase ti me projection chamber (TPC) that used 370 kg of xenon to search for the\nnu clear recoil signature of WIMPs\, producing world-leading results into 2017 .\nThe success of LUX relies on effective background controls. Several step s were taken to\nshield LUX from external backgrounds caused by high energy cosmic rays or from radioactive\ndecays. First\, its placement in the Davi s Cavern at SURF provided $\\approx$ 4200 m.w.e of\noverburden to eliminate most secondary particles produced by cosmic rays and reduce the\natmospher ic muon flux. LUX was also installed inside of a 20' by 25' water tank\, wi th low\nbackground steel shielding underneath\, to provide extensive passiv e protection from radioactive\ndecays in the local environment. Muon-induce d neutrons were of special concern\, as they could\nbe produced by muons pa ssing through the water tank near the detector. In order to veto these\neve nts the water tank was instrumented with twenty 10" Hamamatsu photomultipli er tubes\n(PMTs) that monitor relativistic charged particles entering the w ater volume. This allowed the\nwater tank to serve as an active water chere nkov muon veto during the final LUX WIMP-search\n(WS) run.\nThis talk discu sses the analysis of this active veto data\, focusing on the measured muon\ nflux and events coincident between LUX and the veto in the WIMP-search dat a. The overall\nmuon flux is found to be consistent with previous measureme nts. No excess of muon-induced\nevents were found in the WS dataset. Numero us detector issues\, mostly related to the\nelectronics\, hampered the anal ysis work\, requiring careful characterization and handling. This\nwork is of particular interest as the successor to LUX\, the LUX-ZEPLIN (LZ) experi ment\, will\nutilize the same water tank and encounter the same external ba ckgrounds as LUX. LAST-MODIFIED:20180921T140112Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180306T160000 DTEND;TZID=America/New_York:20180306T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180306T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Fernando Miralles-Wilhelm\n\nSpeaker Institution: CMNS Atmospheric & Oceanic Science \n\nTitle: What would Thomas Malthus tell us in the 21st Century?: Experiences in the Water-Energy-Food Nexus fr om an International Development Perspective\n\nAbstract: Ongoing research focused on analyzing the synergies and tradeoffs posed by the water-energy- food nexus is presented. This covers the need for quantitative tools (e.g.\ , data\, models) to support the analysis of integrated water\, energy and f ood systems\, from a perspective relevant to the work of international deve lopment organizations: dialog with countries and increasing awareness of “n exus” thinking and planning\, building regional and in-country capacity tow ard integrated planning and identification/evaluation of trade-offs and syn ergies in developing such systems\, and fostering interdisciplinary experti se in principles\, algorithms\, and model formulations for understanding an d evaluating the potential of implementing nexus approaches within a system s perspective. This research stresses the necessity of integrating areas of disciplinary expertise\, the ability to identify and address shared needs of water\, energy and food stakeholders\, and facilitating tailored analyse s over different spatial and temporal scales. Outputs and products of recen t nexus work will highlight further research and development needs focused on upstream sector planning in order to identify primary opportunities and constraints to water\, energy\, and food system development\, and also resu lt in an improved understanding of economic and social trade-offs among com peting nexus priorities\, and particularly prioritization of sector investm ents. Four recent experiences in South Africa\, China\, the Middle East and Latin America are presented as examples of nexus tradeoffs offering a rati onale for investment rationalization and priorities.\n\nBIO:\nDr. Fernando Miralles-Wilhelm is a hydrologist and water resources engineer with researc h expertise in modeling of surface and groundwater hydrology\, solute trans port with physical\, chemical and biological processes in aquatic ecosystem s\, climate-hydrology-vegetation interactions\, stormwater management in ur ban watersheds\, water-energy-food nexus and system dynamics modeling. He c urrently serves as Executive Director of the Cooperative Institute for Clim ate and Satellites (CICS) and Interim Director of ESSIC (Earth System Scien ce Interdisciplinary Center)\, both at the University of Maryland (UMD)\, w here he also holds an appointment as Professor with the Department of Atmos pheric and Ocean Sciences. Before joining UMD\, Dr. Miralles was a Lead Spe cialist at the Inter-American Development Bank (IDB)\, where he managed the bank's investment portfolio in water resources and climate adaptation proj ects for the IDB’s 26 countries served in the Latin American and the Caribb ean region. He is a Fellow of the American Society of Civil Engineers (2009 ) and a Diplomate of the American Academy of Environmental Engineers (2002) and the American Academy of Water Resources Engineers (2008). He holds a m echanical engineering diploma from Universidad Simón Bolívar in Venezuela\, a Masters degree in Engineering from the University of California-Irvine\, and a Ph.D. in Civil and Environmental Engineering from the Massachusetts Institute of Technology (MIT). \n\nHosted by Victor Yakovenko LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium - cancelled TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180410T151500Z DTEND:20180410T161500Z DTSTAMP:20260828T094430Z UID:7jd7v6bp5rbh2a8d9k3a0oqbb7@google.com CREATED:20180403T130354Z DESCRIPTION:Speaker: Professor Ken Dill\, Stony Brook University

Title: Maximum Caliber: An Inference Principle for Nonequilibrium St atistical Physics

Abstract: \;Maximum Caliber is a principle for inferring pathways and rate distributions of kinetic pro cesses. The structure and foundations of MaxCal are much like those of Max imum Entropy for static distributions. We have explored how MaxCal may ser ve as a general variational principle for nonequilibrium statistical physic s -- giving well-known results\, such as the Green-Kubo relations\, Onsager 's reciprocal relations and Prigogine's Minimum Entropy Production principl e near equilibrium\, but is also applicable far from equilibrium. I will a lso discuss some new applications -- to finding reaction coordinates in mol ecular simulations\, and to modeling brain rewirings\, for example. \; LAST-MODIFIED:20180409T134635Z LOCATION:1116 IPST Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T210000Z DTEND:20161130T220000Z DTSTAMP:20260828T094430Z UID:hh2drmc7kiggbesf685l0u3k5g@google.com CREATED:20161123T151050Z DESCRIPTION:Speaker Name: Dr. Nate Ferraro\n\nSpeaker Institution : Princet on University\n\nTitle : Modeling Tokamak Transients with M3D-C1\n\nAbstrac t : Edge localized modes (ELMs) and disruptions have been identified as amo ng the most serious challenges to a successful tokamak fusion reactor due t o the large\, transient heat fluxes — and forces\, in the case of disruptio ns — that they produce. Due to the macroscopic\, electromagnetic character of these instabilities\, modeling these “transients” is naturally done usin g extended-MHD codes. Here we describe how the extended MHD code M3D-C1 is being used to address the challenges presented by ELMs and disruptions. Two -fluid modeling of perturbed equilibria has given new insight on the method of ELM suppression by resonant magnetic perturbations (RMPs). These calcul ations show the tendency of RMPs to drive reconnection at the top of the H- mode pedestal\, where the electron rotation passes through zero\, thereby p roviding a mechanism for limiting the pedestal to a stable width. Nonlinear calculations of vertical displacement events (VDEs) model the current-quen ch phase of a disruption. In this phase\, strong eddy currents and “Halo” c urrents arise in the surrounding conducting structures\, leading to conside rable mechanical stresses on these structures. The implementation of the re sistive wall model in M3D-C1 allows these forces to be spatially resolved f or walls of arbitrary thickness. The non-axisymmetric evolution of the plas ma is shown to depend strongly on its thermal history\, providing insight i nto strategies for disruption mitigation.\n LAST-MODIFIED:20161128T142736Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170215T210000Z DTEND:20170215T223000Z DTSTAMP:20260828T094430Z UID:lun0sldrjh8ag50ah3cs2d0lb0@google.com CREATED:20170210T145857Z DESCRIPTION:Speaker Name: Daniel Fiorino\n\nSpeaker Institution : Universit y of Maryland\n\nTitle : "The HAWK Gamma-Ray Observatory: a Versatile Instr ument for Exploring the TeV Sky"\n\nAbstract: After two years of operation\ , the High-Altitude Water Cherenkov (HAWC) \nObservatory has mapped out the TeV gamma-ray sky in the Northern Hemisphere revealing many familiar struc tures along with a few new ones. Located between two mountain peaks in Mexi co\, the HAWC detector collects Cherenkov light from extensive air showers from primary gamma rays and cosmic rays with its 300 light-tight water tank s that are instrumented with four photomultiplier tubes each. This detectio n method allows for uninterrupted observation of the the entire overhead sk y but has a sensitivity that peaks at zenith. After careful analysis of nea rly 1 trillion air shower triggers\, we have identified 39 TeV gamma-ray so urces of various classes - of which 16 are new. This data set is more than just a deep survey. Time variability studies of the blazars Mrk421 and Mrk5 01 will be shown as well as multimessenger followups to IceCube high-energy neutrinos and LIGO gravitational waves. Observations coincident with objec ts with low mass-to-light ratios have also yielded dark matter constraints. In addition\, we have mapped the anisotropic TeV cosmic-ray sky in effort to better constrain local cosmic-ray accelerators and intervening magnetic fields. LAST-MODIFIED:20170210T150754Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161020T193000Z DTEND:20161020T210000Z DTSTAMP:20260828T094430Z UID:95k4q2fcc059bb3or0ap1fqmi8@google.com CREATED:20160930T144411Z DESCRIPTION:Speaker: Lara Anderson (Virginia Tech) and Andrew Harder (Univ. of Miami) LAST-MODIFIED:20160930T144411Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Titles TBA TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160415T161500Z DTEND:20160415T171500Z DTSTAMP:20260828T094430Z UID:g5hn7p1hvmqk4v60gvrm5kiesc@google.com CREATED:20160408T175837Z DESCRIPTION:Speaker Name: Dr. Dmitry Efimkin\n\nSpeaker Institution: JQI/CM TC\n\nTitle: Non-Markovian quantum friction of bright solitons in superflui ds\n\nAbstract: I will discuss the quantum dissipation of a bright soliton in a quasi-one-dimensional bosonic superfluid. I will argue that due to the integrability of the original problem\, usual Ohmic friction proportional to a velocity is absent. It uncovers the non-Ohmic and non-Markovian fricti on\, which can be interpreted as the backreaction of Bogoliubov quasipartic les inelastically scattered by an accelerating soliton\, which represents a n analogue of the Abraham-Lorentz force known in electrodynamic.\n\nThe tal k is based on the recent work by Dmitry K. Efimkin\, Johannes Hofmann and V ictor Galitski -http://arxiv.org/abs/1512.07640\n LAST-MODIFIED:20160411T185704Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161006T193000Z DTEND:20161006T203000Z DTSTAMP:20260828T094430Z UID:jm332q7k4mb2u3lssd86u0jn9o@google.com CREATED:20160930T143941Z DESCRIPTION:Speaker: David Pincus (UMd)\nAbstract: We'll start to explain w hat the Fukaya category is\,\nwhich is needed to make sense of Kontsevich's homological mirror\nsymmetry conjecture. LAST-MODIFIED:20160930T143941Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Introduction to the Fukaya category TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180608T150000Z DTEND:20180608T161500Z DTSTAMP:20260828T094430Z UID:05lpe5hbopr2oje9btcmblbinl@google.com CREATED:20180606T170259Z DESCRIPTION:Speaker: Tero Heikkilä\, University of Jyväskylä\, Finland
Title: Asymptotic flat band superconductivity in twisted bilayer grap hene and other systems

Abstract: The effective attractive intera ction between electrons\, mediated by electron-phonon coupling\, is a well- established mechanism of conventional superconductivity. In metals exhibiti ng a Fermi surface\, the critical temperature of superconductivity is expon entially smaller than the characteristic phonon energy. Therefore such supe rconductors are found only at temperatures below a few Kelvin. In contrast\ , electron systems with exotic energy dispersion exhibit different function al dependence on electron-phonon coupling\, and can in principle host a sup erconducting state at much higher temperatures. We have in particular studi ed electron-phonon mediated superconductivity in systems with asymptoticall y flat bands [1]. There\, the critical temperature is a linear function of the effective attractive interaction [2\,3]. A particularly interesting cas e is that of twisted bilayer graphene. It holds an approximate flat band at certain magic twisting angles\, and recent experiments have demonstrated t he presence of superconductivity in such systems. In my talk I will discuss these findings from the perspective of flat-band superconductivity mediate d by electron-phonon interaction [4]. In addition\, I will discuss other mo del systems possibly exhibiting flat-band superconductivity.

[1] R. Ojajärvi\, T. Hyart\, M.A. Silaev\, and T.T. Heikkilä\, arXiv:1801.01794.[2] N.B. Kopnin\, T.T. Heikkilä\, and G.E. Volovik\, Phys. Rev. B 83\, 22 0503(R) (2011).
[3] T.T. Heikkilä and G.E. Volovik\, arXiv:1504.05824.[4] T. Peltonen\, R. Ojajärvi\, and T.T. Heikkilä\, arXiv:1805.01309 LAST-MODIFIED:20180608T140141Z LOCATION:CMTC Conference Room (Toll 2205) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171208T160000Z DTEND:20171208T171500Z DTSTAMP:20260828T094430Z UID:0pi52g2h9qg0fso7kmb7j3dbeo@google.com CREATED:20171114T005923Z DESCRIPTION:Speaker: Shaffique Adam (Yale-NUS College)

Title: The role of electron-electron interactions indisordered Dirac fermions

Abstract: Condensed matter realizations of Dirac fermions are now ubiquitous. \; The most notable example is single monoatomic sheets of carbon called graphene\, where its simplicity and ease of preparation has made it a textbook system to test theoretical models [1 ]. \; In this talk\, I will address the question of what h appens to Dirac fermions in the regime where electron-electron interactions are the dominant relaxation mechanism. \; First\, using a combination of nonperturbative numerical and analytical techniques that in corporate both the contact and long-range parts of the Coulomb interaction\ , we identify the two previously discussed regimes: a Gross-Neveu transitio n to a strongly correlated Mott insulator\, and a semi-metallic state with a logarithmically diverging Fermi velocity accurately described by the rand om phase approximation. \; Most interestingly\, we show th at experimental realizations of Dirac fermions span the crossover between t hese two regimes providing the physical mechanism that masks this velocity divergence [2]. \; Second\, starting from a microscopic tr eatment of electron-electron\, electron-phonon and electron-impurity intera ctions within the Random Phase Approximation\, we demonstrate that monolaye r and bilayer graphene both host two different hydrodynamic regimes where t he system can be described as a classical liquid. \; We pr edict that the hydrodynamic window in bilayer graphene is stronger than in monolayer graphene\, and has a characteristic `v-shape' as opposed to a`lun g-shape'. \; Finally\, we explore the consequences of thes e results on real experiments\, and find that disorder-induced puddles cont inue to play a consequential role\, even in these strongly interacting syst ems.

[1] S. Das Sarma\, S. Adam\, E. H. Hwang\, and E. Rossi\, “Electronic transport in two dimensional graphene”\, Rev. Mod. Phys . 83\, 407 (2011).

[2] < /span>H. Tang\, J.N. Leaw\, J.N.B. Rodrigues\, I. F. Herbut\, P. Sen gupta\, F.F. Assaad\, and S. Adam\, " The role of electron-electron inte ractions in two-dimensional Dirac fermions"\, Submitted (2017).< span>

[3] D. Y.H. Ho\, I. Yudhistira\, N. Chakraborty\, and S. Adam\, “Microscopic theory for electron hydrodynamics in monolayer a nd bilayer graphene”\, arXiv:1710.10272 \; (2017).

Host: Sankar Das Sarma

http://w ww.physics.umd.edu/cmtc/seminars.html

When: Fri\, Dec. 8 @ 11:00 am
Where: CMTC Conference Room (2205 Toll Physics Bldg.)
LAST-MODIFIED:20171128T130106Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180130T160000 DTEND;TZID=America/New_York:20180130T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8@google.com RECURRENCE-ID;TZID=America/New_York:20180130T160000 CREATED:20180102T192312Z DESCRIPTION:\nSpeaker Name: Seung-Hun Lee\n\nSpeaker Institution: Universi ty of Virginia\n\nTitle: New Materials for Next Generation Printable Solar Cells\n\nAbstract: The realization of economical renewable energy technol ogies is critical for securing long-term prosperity of mankind and mitigati ng the threat of climate change. Power from the Sun is the most abundant so urce of renewable energy. In just one hour\, more solar energy hits the Ear th’s surface than humanity uses in an entire year. Therefore\, development of solar cells that can produce electrical power at a cheaper rate than fos sil fuel-based electricity is highly desirable. However\, only about one p ercent of the world’s energy production currently comes from solar cells. T his is because conventional technologies\, mostly based on silicon solar ce lls\, are too expensive to be competitive with energy generated by burning fossil fuels. What is needed is research on new solar cell materials that c an be fabricated into solar cells with high-efficiency and low-cost simulta neously.\n\nHybrid Organic-Inorganic perovskites (HOIPs) have recently been discovered as one of the most promising next generation solar cell materia ls. Solar cells based on HOIPs have achieved high efficiency that rivals th at of the conventional silicon solar cells. At the same time\, HOIPs can be deposited on surfaces from ink solutions which enable low-cost and high-th roughput manufacturing of solar cells as if printing out newspapers. In thi s talk\, I will present our recent research that revealed microscopic mecha nism of the photovoltaic properties of HOIPs.\n[1-3]\n\nReferences\n1. Orig in of Long Lifetime of Band-Edge Charge Carriers in Organic-Inorganic Lead Iodide\nPerovskites\, Tianran Chen\, Wei-Liang Chen\, Benjamin J. Foley\, J ooseop Lee\, Jacob Ruff\, J.\nY. Peter Ko\, Craig M. Brown\, Leland W. Harr iger\, Depei Zhang\, Changwon Park\, Mina\nYoon\, Yu-Ming Chang\, Joshua J. Choi\, and Seung-Hun Lee\, Proc. Natl. Acad. Sci. 114\,\n7519-7524 (2017). \n2. Entropy Driven Structural Transition and Kinetic Trapping in Formamidi nium Lead Iodide\nPerovskite\, Tianran Chen\, Benjamin J. Foley\, Changwon Park\, Craig M. Brown\, Leland W.\nHarriger\, Jooseop Lee\, Jacob Ruff\, Mi na Yoon\, Joshua J. Choi\, and Seung-Hun Lee\, Science\nAdvances 2\, e16016 50 (2016).\n3. Rotational dynamics of organic cations in CH 3 NH 3 PbI 3 \, T. Chen\, B. J. Foley\, B. Ipek\, M.\nTyagi\, J.R.D. Copley\, C. M. Brown\ , J. J. Choi\, S.-H. Lee\, Phys. Chem. Chem. Phys. 17\,\n31278-31286 (2015) .\nHosted by Eun-Suk Seo LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180910T110000 DTEND;TZID=America/New_York:20180910T120000 RRULE:FREQ=WEEKLY;UNTIL=20180924T035959Z;BYDAY=MO DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44@google.com CREATED:20180829T133041Z DESCRIPTION:\nSpeaker: \n\nAffiliation: \nTitle: \n\nAbstract: LAST-MODIFIED:20180910T175653Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180904T171500Z DTEND:20180904T181500Z DTSTAMP:20260828T094430Z UID:7hv3inv2umeqgr1rghoqfuqrcm@google.com CREATED:20180827T135506Z DESCRIPTION:Speaker: Alexander Efros\, Naval Research Laboratory

Tit le: Optical Properties of Nano-Crystal Quantum Dots

Abstract: Semiconductor nanocrystals (NCs) are the most heavily studied of the nanos cale semiconductors. The size dependence of the NC optical properties was d iscovered independently more than 30 years ago in two different materials: in semiconductor-doped glasses by Ekimov et al (1981)\, and in aqueous solu tions by Brus et al (1983). The 30 plus years of investigations of NCs got a critical burst when Brus’ former postdoc\, M. Bawendi\, moved from Bell L abs to MIT where\, in 1993\, he and two of his students\, C. Murray and D. Norris\, published a paper that provided the first reliable technology of v arious colloidal nanocrystal growth. The technology allows growth of almost monodisperse NCs in a wide range of sizes. The paper demonstrated the extr emely narrow NC size dispersion with remarkable control of the CdSe NC size . Finally the authors showed that various semiconductors could be grown in NC form. I will briefly discuss the history of the discovery\, the main obs tacles in the development of the field and the critical breakthroughs in es tablishing the field. \;

Today\, semiconductor NCs have become m uch more than objects of scientific curiosity. The demonstration of tunable \, room-temperature lasing using NC quantum dot solids\, the development of NC-based light-emitting diodes and photovoltaic cells\, and the first comm ercial products in the area of NC bio-labeling are just a few illustrations of the broad technological potential of these materials. Turn out that non radiative Auger recombination is the central nonradiative relaxation proces s\, which negatively affect the performance of all these devices. \;

 \;I am going to discuss why the nonradiative Auger recombination is enhanced in NCs and how we can suppress them. Finally I am going to disc uss optical properties of recently discovered CPbX3 (X=Cl\, Br. I) quantum dots which for the first time have the bright ground exciton state. LAST-MODIFIED:20180830T154629Z LOCATION:1116 IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171213T180000Z DTEND:20171213T190000Z DTSTAMP:20260828T094430Z UID:1h49gmc2n0pu6iadbttferi8m3@google.com CREATED:20171108T141417Z DESCRIPTION:Speaker: Hakop Pashayan\n\nAffiliation: University of Sydney\n\ nTitle: From estimation of quantum probabilities to simulation of quantum c ircuits\n\nAbstract: We show that there are two distinct aspects of a gener al quantum circuit that can make it hard to efficiently simulate with a cla ssical computer. The first aspect\, which has been well-studied\, is that i t can be hard to efficiently estimate the probability associated with a par ticular measurement outcome. However\, we show that this aspect alone does not determine whether a quantum circuit can be efficiently simulated. The s econd aspect is that\, in general\, there can be an exponential number of ‘ relevant’ outcomes that are needed for an accurate simulation\, and so effi cient simulation may not be possible even in situations where the probabili ties of individual outcomes can be efficiently estimated. We show that thes e two aspects are distinct and independently necessary for simulability.\n\ nSpecifically\, we prove that a family of quantum circuits is efficiently s imulatable if it satisfies two properties: one related to the efficiency of Born rule probability estimation\, and the other related to the sparsity o f the outcome distribution. We then prove a pair of hardness results (using standard complexity assumptions and a variant of a commonly-used average c ase hardness conjecture)\, where we identify families of quantum circuits t hat satisfy one property but not the other\, and for which we can prove tha t efficient simulation is not possible. To prove our results\, we consider a notion of simulation of quantum circuits\, that we call EPSILON-simulatio n. This notion is less stringent than exact sampling and is now in common u se in quantum hardness proofs. LAST-MODIFIED:20171108T141417Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180213T160000 DTEND;TZID=America/New_York:20180213T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180213T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Matt Green\n\nSpeaker Institution: NC State\n\nTi tle: COHERENT Neutrino Scattering at the SNS\n\nAbstract: Coherent Elastic Neutrino-Nucleus Scattering (CEvNS) is a neutral-current process in which a neutrino interacts coherently with an entire nucleus. While the coherence of the process leads to a large cross section enhancement with increasing n eutron number\, the low momentum transfer results in difficult-to-detect lo w energy nuclear recoils. The COHERENT Collaboration has combined state-of- the-art low-threshold detector technology with the intense flux of neutrino s generated at Oak Ridge National Laboratory’s Spallation Neutron Source (S NS) to detect CEvNS for the first time\, and is developing it as a tool for searches for physics beyond the Standard Model\, including Non-Standard Ne utrino Interactions (NSIs)\, oscillations into sterile neutrinos\, nuclear form factors\, and neutrino magnetic moments. This talk will detail the fir st-ever observation of CEvNS\, as reported in our recent publication in Sci ence\, and the COHERENT Collaboration's follow-up efforts to fully characte rize the interaction with Liquid Argon\, High-Purity Germanium\, and Sodium -Iodide -based detectors.\n\n\nHosted by Carter Hall LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161104T161500Z DTEND:20161104T171500Z DTSTAMP:20260828T094430Z UID:osn0pbsevu9k7ksaqi7h1s99cs@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.osn0pbsevu9k7ks aqi7h1s99cs CREATED:20161026T165647Z DESCRIPTION:Title: "Patterned Complexity in Atomic Scattering"\n\nSpeaker N ame: Brandon Ruzic\n\nSpeaker Institution: JQI\n\nAbstract: \n\nAs the cons tituents of cold gaseous matter continue to grow in complexity\, the necess ity to understand their basic collision processes remains. Exotic atomic sp ecies like erbium and dysprosium have been cooled to ultracold temperatures \, revealing a dense forest of chaotically distributed resonances\, a much more complicated landscape than the broad\, isolated resonances seen in alk ali-atom systems. Nevertheless\, broad resonances emerge from the chaos. Th ese resonances correspond to special halo-like eigenstates\, which seem to occur in a predictable pattern. In this talk\, I will describe a simple and powerful quantum defect theory for atomic scattering\, how this theory can simply describe chaotic collisions\, and how this theory may illuminate th e character of the halo-like eigenstates.\n\n*Lunch served at 12pm!*\n\nJoi n with Google Hangouts: https://plus.google.com/hangouts/_/calendar/bGJrNjY wYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.osn0pbsevu9 k7ksaqi7h1s99cs?hs=121 LAST-MODIFIED:20161026T165647Z LOCATION:2136 Physical Science Complex\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170304T000000Z DTEND:20170304T013000Z DTSTAMP:20260828T094430Z UID:ctktvsdsmmk59l24nelasuebjg@google.com CREATED:20170131T161021Z DESCRIPTION:The Physics of Fantastic Worlds: From Star Wars to Harry Potter \n\nWizards have magic\, but Muggles have science! Join us for an exciting and interactive\nphysics demonstration show.\n\nhttps://umdphysics.umd.edu/ events/aboutus-outreach/physics-is-phun.html#2016-2017-physics-is-phun-prog rams LAST-MODIFIED:20170131T161021Z LOCATION:1410/1412 Toll Physics Building\, UMD SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170302T173000Z DTEND:20170302T183000Z DTSTAMP:20260828T094430Z UID:7s701j24kccr8toltk9mn7rffk@google.com CREATED:20170127T152931Z DESCRIPTION:Speaker Name: Dan Lathrop\n\nSpeaker Institution : Department of Physics - University of Maryland\n\nTitle : Helicity Dynamics\n\nAbstr act: Helicity is a conserved quantity that arises in ideal fluid flows and ideal magnetohydrodynamic magnetic fields. I will first review the backgrou nd theory of Helicity in those two cases\, a famous paper by Finn and Anton sen\, and another by Keith Moffatt. I will follow by covering some basic ph enomenology of quantized vortices\, reconnection\, and Kelvin waves\, and b ackground of our visualization studies in superfluid helium. These topics l ead into a discussion of what has been done\, what we know\, and what is pr edicted about Helicity dynamics. Some observations about the untangling of vortices via reconnection lead to predictions regarding the Helicity we are exploring experimentally. Some puzzles and questions about the role of inv ariants like the Helicity in the Gross-Pitaevskii (nonlinear Schrodinger) e quation play a role in thinking about this phenomenon. LAST-MODIFIED:20170224T143954Z LOCATION:ERF 1207 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160712T190000Z DTEND:20160712T203000Z DTSTAMP:20260828T094430Z UID:6ppjics8t53fkdd8b80fhkfg9c@google.com CREATED:20160706T134128Z DESCRIPTION:Name: Anton de la Fuente\, University of Maryland\n\nDissertati on Title: The Conformal Bootstrap and Critical Universality \n\nAbstract: A conformal field theory is so constrained by symmetry that all its correlat ion functions are completely determined by its set of 2- and 3-point functi ons\, which are in turn determined by a discrete set of numbers\, known as the conformal data of the CFT. In order for the conformal data to consisten tly determine all higher-point functions\, they must satisfy a highly nontr ivial set of consistency conditions\, known as the conformal bootstrap equa tions. It has recently been discovered that numerical methods can efficien tly identify large regions in the space of conformal data that are inconsis tent with the bootstrap equations. Using these methods\, we give evidence t hat the 2D Ising CFT is the only CFT with a Z2 symmetry and two relevant op erators. This shines a new light on the concept of universality in the stud y of critical phenomena. LAST-MODIFIED:20160708T131519Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Anton de la Fuente Doctoral Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171204T213000Z DTEND:20171204T223000Z DTSTAMP:20260828T094430Z UID:3944rkipiq7og129a2qdoa3psv@google.com CREATED:20171124T221615Z DESCRIPTION:Title : Millisecond Pulsars\, Positrons and the Galactic Bulge\ nSpeaker Name : Alice Harding\nSpeaker Institution : NASA Goddard Space Fli ght Center\nNotes : Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : Rotation -powered pulsars that spin at millisecond periods are prevalent in the Gala xy as radio\, X-ray and gamma-ray pulsars. Fermi has discovered a populatio n of gamma-ray millisecond pulsars (MSPs) in the disk and in globular clust ers. Pulsars have been invoked to explain the local cosmic-ray positron exc ess\, seen by AMS2\, as well as the gamma-ray excess at the Galactic center seen by Fermi. I will discuss population synthesis simulations of radio an d gamma-ray MSPs and the question of whether MSPs could account for the Gal actic bulge excess. A population of MSP binaries thought to contain intra-b inary shocks that accelerate positrons could also be contributing to the lo cal positron excess. LAST-MODIFIED:20171124T221615Z LOCATION:ATL Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space And Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171207T190000Z DTEND:20171207T203000Z DTSTAMP:20260828T094430Z UID:3htps0iast9um5ehfkp5oeujfa@google.com CREATED:20170908T211222Z DESCRIPTION:Speaker: Abram L. Falk\, Ph.D.\nNanoscale Science & Technology \nIBM T.J. Watson Research Center\n\nTITLE: Carbon nanotubes at the wafer s cale\n\nABSTRACT: I will discuss efforts at IBM Research to develop high-p erformance electronic and optical devices with carbon nanotubes. Nanotubes have the potential to significantly outperform silicon\, enabling an exciti ng array of 21st-century information technologies. To meet this challenge\, we have purified semiconducting nanotubes to the 99.999% level\, patterned them into narrow-pitch arrays\, and demonstrated that they can support hig h-speed CMOS logic. Another one our new results is that carbon nanotubes su pport coherent plasmon resonances. These plasmons\, which comprise charge o scillations in the nanotubes coupled to electromagnetic fields\, can enhanc e light-matter interaction strengths by up to a factor of 107. They are a p latform for electrically tunable optical elements\, surface-enhanced absorp tion spectroscopy\, and high-speed receivers at infrared and terahertz freq uencies. In the long term\, carbon nanotubes could be a foundation for unif ying electrical and optical logic at the nanometer scale.\n\nHOST: J. Will iams\n\nNOTE: Giving LPS Talk on the 6th. LAST-MODIFIED:20171128T224523Z LOCATION:Room 1201\, John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Abram L. Falk\, IBM TJWatson Research Ctr TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171002T153000Z DTEND:20171002T160000Z DTSTAMP:20260828T094430Z UID:0ggscpv6e60ecif7c2fe17l1b7@google.com CLASS:PUBLIC CREATED:20170926T130429Z DESCRIPTION:Tobias Huber\, JQI\n\nTitle:\nQuantum dots as photon sources\n\ nAbstract:\nIn this talk I will introduce semiconductor quantum dots and sh ow how we use them to create single photons. I will show how two-photon res onant excitation can be used to address a forbidden transition and how we u se this to create time-bin entangled photons. I will present how to perform tomography on time-bin entangled photons and conclude with some results. LAST-MODIFIED:20170926T130429Z LOCATION:2400 Atlantic SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171205T160000Z DTEND:20171205T171500Z DTSTAMP:20260828T094430Z UID:6p91mlsvss2v5ji3a5joeksmcp@google.com CREATED:20170727T195510Z DESCRIPTION:Speaker: Mark A. Eriksson\n(Wisconsin Institute for Quantum Inf ormation and Department of Physics\nUniversity of Wisconsin-Madison)\n\nTit le: Quantum control of spins in silicon\n\nAbstract: One of the remarkable features of spins in the solid state is the enormous range of time-scales o ver which coherent manipulation is possible. If one considers gate-controll ed manipulation of nuclear spins at one extreme [1]\, and strongly-interact ing multi-electron qubits at the other extreme [2-4]\, coherent control of spins in semiconductors has been demonstrated with over 9 orders of magnitu de variation in the manipulation time. Remarkably\, confining three electro ns in two neighboring quantum dots enables all electrical control and measu rement of spin dynamics on time scales less than one nanosecond [5]. In th is talk I will discuss the interesting commonalities and contrasts between the two limiting cases: qubits composed of a single-spin\, be it electron o r nuclear\, where magnetically-driven manipulation is required\, and qubits composed of multiple electrons\, for which case direct electric-field mani pulation is possible.\n\n[1] J. T. Muhonen\, et al.\, Nat. Nanotechn. 9\, 9 86 (2014).\n[2] D. P. Divincenzo\, et al.\, Nature 408\, 339 (2000).\n[3] J . Levy\, Phys. Rev. Lett. 89\, 147902 (2002).\n[4] Z. Shi\, et al.\, Phys. Rev. Lett. 108\, 140503 (2012).\n[5] D. Kim\, et al.\, Nature 511\, 70 (201 4).\n\n\nHost: Robert Throckmorton\n\nhttp://www.physics.umd.edu/cmtc/semin ars.html\n\nWhen: Tues\, Dec. 5 @ 11:00am\nWhere: CMTC Conference Room (22 05 Toll Physics Bldg.)\n LAST-MODIFIED:20170917T183851Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171207T203000Z DTEND:20171207T220000Z DTSTAMP:20260828T094430Z UID:4cgkabocrvn5lc0q77sc5qhad4@google.com CREATED:20171201T144815Z DESCRIPTION:Speaker: Matt Calkins (UMD) - \nAbstract: This will be related to the famous paper of C.L. Kane and E.J. Mele\, Z/2 Topological order and the quantum spin Hall effect. Phys. Rev. Lett. 95\, 146802 (2005)\, arXiv:c ond-mat/0506581. LAST-MODIFIED:20171201T144815Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Kane-Mele invariant TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171211T110000 DTEND;TZID=America/New_York:20171211T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171211T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Jacqueline Bloch\, Center for Nanoscience et de Nanote chnology (C2N)\nTitle: Quantum fluids of light in semiconductor lattices\nA bstract: Semiconductor microcavities appear today as a powerful platform fo r the study of quantum fluids of light. They enable confining both light an d electronic excitations (excitons) in very small volumes. The resulting st rong light-matter coupling gives rise to hybrid light-matter quasi-particle s named cavity polaritons. Polaritons propagate like photons but strongly i nteract with their environment via their matter part: they are fluids of li ght and have been shown to exhibit fascinating properties such as superflui dity or nucleation of quantized vortices. Sculpting microcavities at the mi cron scale\, it is possible to engineer lattices of various geometries and use this photonic platform for the emulation of different Hamiltonians.\nI will illustrate with some examples the potential of this non-linear photoni c platform for quantum simulation. Polariton lasing can be triggered in the topological edge states of a 1D SSH chain\, with robustness to disorder re lated to the underlying topology. Quasi periodic lattices have shown fracta l energy spectrum and edge states related to structural topological invaria nts. Finally honeycomb lattices of coupled cavities reveal Dirac physics an d new edge states related to high energy modes emulating p orbitals. \nWhen controlling the interplay between pump\, on-site nonlinearity and dissipat ion\, this photonic platform opens the way to the exploration of complex no n-linear dynamics\, non-linear topological physics and in a near future qua ntum many body physics with light\n LAST-MODIFIED:20171114T121350Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160504T200000Z DTEND:20160504T213000Z DTSTAMP:20260828T094430Z UID:vsf79la5l6v0cu3kqitaal463c@google.com CREATED:20160427T194822Z DESCRIPTION:Speaker Name: L. C. Bland\n\nSpeaker Institution : Brookhaven N ational Laboratory\n\nTitle : Forward Particle Production at Colliders\n LAST-MODIFIED:20160427T195130Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar - Forward Particle Production at Collid ers TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170807T180000Z DTEND:20170807T193000Z DTSTAMP:20260828T094430Z UID:3f67nl7h06u9dunonifee2u0r9@google.com CREATED:20170804T192545Z DESCRIPTION:Title: Dynamics in a Fermi lattice gas\n\nAbstract: Ultracold f ermionic atoms trapped in optical lattices provide a platform to study phen omena in strongly correlated systems that are otherwise challenging to prob e in condensed matter. In this talk\, I will discuss our discovery of "bad metal" behavior for the first time in quantum gases. Bad metals\, such as t he normal state of some high-temperature superconductors\, present anomalou s scaling of resistivity with temperature\, lack of resistivity saturation and the absence of well-defined quasiparticles. A complete understanding o f bad metal behavior remains debated. In our group\, we directly measure th e transport lifetime induced by inter-particle scattering for a mass curren t of atoms excited by stimulated Raman transitions and infer the analog of resistivity. By exploring a range of interaction strengths and a regime of temperature inaccessible to solids\, we identify three characteristics of b ad metals: incoherent transport\, resistivity that does not saturate as Mot t-Ioffe-Regel limit is approached\, and anomalous resistivity scaling consi stent with T-linear behavior. The relationship between anomalous resistivit y scaling\, a reduction of quasiparticle weight from strong interactions\, and bad-metal behavior is validated through comparison to dynamical mean-fi eld theory (DMFT) simulations. LAST-MODIFIED:20170804T192545Z LOCATION:PSC 2136\, College Park\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Presentation: Wenchao Xu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180130T160000 DTEND;TZID=America/New_York:20180130T170000 RRULE:FREQ=WEEKLY;UNTIL=20180206T045959Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8@google.com CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Seung-Hun Lee\n\nSpeaker Institution: University of Virginia LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171116T123000 DTEND;TZID=America/New_York:20171116T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h_R20171109T173000@google.com RECURRENCE-ID;TZID=America/New_York:20171116T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker: Ann Hermundstad\nHHMI Janelia Research Campus\n\nTitle : Adaptive Coding for Sensory Inference in Dynamic Environments\nAbstract: Making reliable inferences about the environment is crucial for survival. I n order to escape a hawk\, for example\, a mouse might need to infer the ha wk’s position and velocity from patterns of light that fall on its retina. Such inferences require large ensembles of sensory neurons whose activity is metabolically expensive. A growing body of evidence suggests that sensor y systems reduce metabolic costs by limiting the fidelity with which some s timuli are encoded in neural responses. Limited coding fidelity\, however\, can lead to inaccuracies in inference. Here\, we derive a framework for dy namically balancing the cost of encoding with the error that encoding can i nduce in inference. We model a system that must use minimal metabolic resou rces to maintain an accurate estimate of a nonstationary environment\, and we show that the optimal system should adapt the fidelity with which stimul i are encoded in neural responses based on a changing estimate of the envir onment. We use this framework to illustrate how a range of neuronal and beh avioral phenomena can be understood as signatures of adaptive encoding for accurate inference. LAST-MODIFIED:20170911T180140Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160504T200000Z DTEND:20160504T210000Z DTSTAMP:20260828T094430Z UID:5nt5l6nllbtc10o0ah7dkols0c@google.com CREATED:20160426T131011Z DESCRIPTION:Speaker Name: Prof. Leonid Pryadko\n\nSpeaker Institution : UC Riverside\n\nTitle : Belief propagation bounds for Ising phase transitions on graphs\n\nAbstract : Unlike the mean field approximation which gives an upper bound of free energy\, Belief propagation (BP\, also known as Bethe-P eierls expansion) is commonly viewed as an ad-hock approximation\, albeit p otentially more accurate. I will argue that\, nevertheless\, BP can be used to bound the pair correlation function and per-spin-susceptibility in the ferromagnetic Ising model on an arbitrary graph\, where spins are placed on graph vertices\, and an interaction term corresponds to each graph edge. I will also present a related inequality for disorder-averaged susceptibilit y\, which gives a bound for the paramagnet-to-ferromagnet transition in a s ign-disordered Ising model at sufficiently small fractions of negative bond s. LAST-MODIFIED:20160428T184558Z LOCATION:Laboratory for Physical Sciences\, 8050 Greenmead Dr\, College Par k\, MD 20740\, United States SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar - Belief propagation bounds for Ising phase transitions on graphs TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170927T183000Z DTEND:20170927T200000Z DTSTAMP:20260828T094430Z UID:0qqpp5mem5pst28tuet0pl8aal@google.com CREATED:20170918T131049Z DESCRIPTION:\nSpeaker: Rodrigo Silva\n\nSpeaker Institution: University of Maryland\n\nTitle: Swimming in curved spacetime: a fully covariant approach \n\nAbstract: It has been argued that a free extended body\, performing fas t cyclic internal motions\, could propel itself through the curved spacetim es of general relativity in a "non-dynamical" manner\, i.e.\, such that the resulting motion would not depend on the rapidity of the internal movement s but only on the sequence of geometrical shapes assumed by the body. This phenomenon has been named swimming in curved spacetime due to the resemblan ce to the motion of swimmers in non-turbulent viscous fluids. Based on Dixo n's theory of dynamics in general relativity\, we develop a fully covariant theory of swimming. We find that although the original analysis supporting this idea is incorrect\, the effect can indeed take place\, but only in sp ecial circumstances. Our methods go much beyond the swimming phenomenon\, p roviding a general description of the motion of small\, articulated bodies in curved spacetimes using a formal map to an analogue problem in special r elativity. LAST-MODIFIED:20170918T131049Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170302T233000Z DTEND:20170303T003000Z DTSTAMP:20260828T094430Z UID:6g6o1lfn0a42pvls5f76p354jc@google.com CREATED:20170213T160354Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\nTentative schedule:\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Prof. S teve FetterThe Day After Trinity\nMar 16Prof. James GatesThe Day The Earth Stood Still\nMar 30Dr. Eric DennaThe Imitation Game\nApr 13Prof. Juan Uriag erekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill Dor landChina Syndrome\n\n LAST-MODIFIED:20170213T185020Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: The Day After Trinity TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170420T200000Z DTEND:20170420T210000Z DTSTAMP:20260828T094430Z UID:pdkuld1309bmccnp8bnehd9tmg@google.com CREATED:20170412T162551Z DESCRIPTION:ASTRONOMY BANG SEMINAR: 4pm in PSC1136\nCareer paths from Kory Kreimeyer\, Astronomy PHD\, Data scientist at FDA\n\nFlyer: https://drive.g oogle.com/file/d/0Bz4x8ufYIK7fX1RKOTJIQWZxNUU/view?usp=sharing LAST-MODIFIED:20170412T163746Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Civic Engagement Week TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180302T180000Z DTEND:20180302T190000Z DTSTAMP:20260828T094430Z UID:2p792gkubqj3a3f8srchhvt9f0@google.com CREATED:20180221T132556Z DESCRIPTION:Speaker: Colin Heikes\, NRC Postdoc Fellow\, NIST Center for Neutron Research


Title: Pressure and Strain Depen dent Control of Structure and Band Topology in the Superconducting type-ll Weyl Semimetal Candidate MoTe2 \;  \; \;


Abstract: \;The reported pressure dependent superconductivity of the proposed type-II Weyl semimetal MoTe2 has led to speculation about the possibility of a topologically non-trivial superconducting state in this m aterial. The interplay between broken inversion symmetry through a structur al phase transition\, superconductivity\, and reported non-trivial band top ology in this system offers a playground for potential interesting and new materials physics. \; A key question about the topology of this superco nducting state is the evolution of the crystal structure of MoTe2 at pressu res and temperatures relevant for superconductivity\, as the non-centrosymm etric Td orthorhombic phase is needed for the Weyl state and non-centrosymm etric superconductors themselves are interesting for supporting proposed Ma jorana modes. We have grown single crystals of MoTe2\, and using a combinat ion of elastic neutron scattering\, magnetotransport\, and spectroscopic te chniques over a range of thermodynamic phase space. I will show that superc onductivity can live within both centrosymmetric\, non-centrosymmetric\, an d mixed structure phase states. I will also show that the application of pr essure and strain allows us to control this state\, and thus likely control the band topology of a superconductor. \; LAST-MODIFIED:20180221T132556Z LOCATION:2110 Chem/Nuc Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160426T171500Z DTEND:20160426T181500Z DTSTAMP:20260828T094430Z UID:nus5t3g81ia1239jmg1qron190@google.com CREATED:20160331T160142Z DESCRIPTION:Speaker Name: Professor David Egolf\n\nSpeaker Institution: Geo rgetown University\n\nTitle: Equilibrium behavior of coarse-grained chaos\n \nAbstract : A wide variety of systems exhibiting spatiotemporal chaos have been shown to be extensive\, in that their fractal dimensions grow linearl y with volume. Ruelle argued that this extensivity is evidence that these s ystems can be viewed as a gas of weakly-interacting regions. We have tested this idea by performing large-scale computational studies of spatiotempora l chaos in the 1D complex Ginzburg-Landau equation\, and we have found that aspects of the coarse-grained system are well-described not only as a gas\ , but as an equilibrium gas --- in particular\, a Tonks gas (and variants) in the grand canonical ensemble. Furthermore\, for small system sizes\, the average number of particles in the corresponding Tonks gas exhibits oscill atory\, decaying deviations from extensivity in agreement with deviations i n the fractal dimension found previously. In concert with earlier\, similar results on a chaotic coupled map lattice\, these results suggest a possibl e framework for developing statistical mechanics for a class of far-from-eq uilibrium systems. LAST-MODIFIED:20160421T160007Z LOCATION:IPST Building Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180924T110000 DTEND;TZID=America/New_York:20180924T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20180924T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Toward quantum computing over the rainbow: entangling th e quantum optical frequency comb\n\nSpeaker: Olivier Pfister\, UVA\n\nAbstr act: Recognized by the 2005 Physics Nobel Prize to Jan Hall and Ted Hänsch\ , the optical frequency comb (OFC) has revolutionized precision measurement s based on spectroscopy\, and optical clocks. The quantum OFC provides an e minently scalable testbed for the implementation of one-way quantum computi ng\, in which measurements effected on a quantum computing “substrate\," ca lled a cluster entangled state\, are all what’s needed to implement quantum logic. In this talk\, I will describe efforts around the globe\, and in my group at the University of Virginia\, toward implementing universal\, faul t tolerant quantum computing over the rainbow. LAST-MODIFIED:20180920T154741Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170213T180000Z DTEND:20170213T193000Z DTSTAMP:20260828T094430Z UID:p2gtemnt4sqnv4t4urkd0lngj8@google.com CREATED:20170206T140113Z DESCRIPTION:Speaker: Duff Neill\n\nSpeaker Institution: Los Alamos National Lab\n\nTitle: The Substructure of Jets\n\nAbstract: The field of jet subst ructure has rapidly developed over the last few\nyears in order to maximize the use of the data recorded at the Large\nHadron Collider. This has force d QCD theorists to think hard about the\nstructure of the QCD cascade to fi nd observables which can\ndiscriminate between hadronically decaying color singlet states from\nthe QCD background. After giving an introduction to So ft-Collinear\nEffective Field Theory and the ideas behind factorization the orems\, I\nwill explain how effective field theory and the use of power cou nting\ngives an intuitive way to organize the phase space for the QCD\ncasc ade. The mode decomposition and power counting of the EFT breaks\nup the ph ase-space into regions where one can use factorization\ntheorems to resum t he perturbation series for both signal and\nbackground distributions\, lead ing to reliable predictions for\ndiscrimination. Beyond their phenomenologi cal utility\, such\nsubstructure factorization theorems can in turn be used to illuminate\nthe formal structure of the perturbation series for more in clusive\nobservables\, allowing one to demonstrate emergent phenomena in je t\ndynamics. Such phenomena is not captured when using standard\nfixed-orde r perturbation theory\, leading to a finite radius of\nconvergence for even the leading logarithmic series. LAST-MODIFIED:20170206T140139Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171002T190000Z DTEND:20171002T203000Z DTSTAMP:20260828T094430Z UID:16hgm3qknj0m3o20nnuldor0rd@google.com CREATED:20170922T191849Z DESCRIPTION:Speaker: Salvator Lombardo\n\nSpeaker Institution: Cornell\n\nT itle: Continuum Naturalness\n \nAbstract: The LHC has put the naturalness p aradigm under pressure since one generally expects new colored resonances a t the TeV scale to address the hierarchy problem. There exists another poss ibility\, however. New dynamics responsible for furnishing a pseudo-goldsto ne Higgs may have a gapped continuum of colored excitations\, in which case the top partners and vector resonances appear as branch cuts rather than p oles in scattering amplitudes. The new colored states in this scenario cann ot be described as Breit-Wigner resonances\, drastically changing their LHC phenomenology. I will present a model in which a fermionic top partner con tinuum cuts off the quadratic divergence of the Higgs mass and show that di rect experimental constraints on such a scenario can be weakened relative t o traditional composite Higgs models. LAST-MODIFIED:20170922T191849Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180426T123000 DTEND;TZID=America/New_York:20180426T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180426T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Dan Gauthier\n\nSpeaker Institution: Ohio State Depart ment of Physics\n\nTitle: High-speed prediction of a chaotic system using r eservoir computers\n\nAbstract: A reservoir computer is an approach to mach ine learning that appears to be ideally suited for classifying time varying signals or as a black-box system for forecasting the behavior of a dynamic al system. It consists of a recurrent artificial neural network that serve s as a “universal” dynamical system into which data are input\, where the c onnections on the input layer and recurrent links within the network are ch osen randomly and held fixed. Only the weights of network output layer are adjusted during the training period\, which greatly reduces the training t ime. I will discuss our recent progress on realizing high-speed prediction of the Mackey-Glass chaotic system (>10^8 predictions per second) using a reservoir computer based on a time-delay autonomous Boolean network realize d on a field programmable gate array. I will also touch on our efforts to control a dynamical system with a reservoir computer and some recent result s on methods to identify the optimum size of the reservoir computer network for a given task. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180508T171500Z DTEND:20180508T181500Z DTSTAMP:20260828T094430Z UID:16rfhgn9j7u6ev7i5685ajfvf2@google.com CREATED:20180417T135656Z DESCRIPTION:Speaker: Dr. Pablo Sartori\, Rockefeller University

Titl e: Copying in Cells: Energy\, Speed\, and Accuracy

Abstract:  \;All living organisms possess the ability to replicate. At the c ellular scale\, replication requires copying of the DNA polymer. On the one hand\, accurate copying of DNA is necessary for the viability of new cells . On the other\, evolutionary pressure favors high replication rates. There fore\, the balance between the speed and accuracy of copying is a fundament al characteristic of living matter. Using a minimal model of polymer replic ation\, we show that the trade-off between speed and accuracy of copying is modulated by energy consumption. We further formalize several non-equilibr ium copying strategies developed by cells\, and discuss their different ope rating regimes and corresponding trade-offs. \; LAST-MODIFIED:20180504T195453Z LOCATION:IPST 1116 Conference Rooom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180427T170000Z DTEND:20180427T180000Z DTSTAMP:20260828T094430Z UID:7al5uusvk6fqi1e0s27d207gcv@google.com CREATED:20180417T133948Z DESCRIPTION:Speaker: Eva Campo\, Program Director\, Division of Material s Research National Science Foundation
Title: TBA LAST-MODIFIED:20180419T173254Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180110T160000Z DTEND:20180110T170000Z DTSTAMP:20260828T094430Z UID:16o45eoe2sonba38tkq3si2da3@google.com CREATED:20180105T134839Z DESCRIPTION:Speaker Name: Kevin Slagle\n\nSpeaker Institution: University o f Toronto\n\nTitle: Beyond Topological Order: Fractons and Their Field Theo ry\n\nAbstract: Recently\, exactly solvable 3D lattice models have been dis covered for a new kind of phase\, dubbed fracton topological order\, in whi ch the topological excitations are immobile or are bound to lines or surfac es. Unlike liquid topologically ordered phases (e.g. Z_2 gauge theory)\, wh ich are only sensitive to topology (e.g. the ground state degeneracy only d epends on the topology of spatial manifold)\, fracton orders are also sensi tive to the geometry of the lattice. This geometry dependence allows for ne w physics which was forbidden in topologically invariant phases of matter. \n\nIn this talk\, I will review the X-cube model [1] of fracton order and how geometry dependence allows for braiding of point-like particles in this 3D phase. I'll summarize how the X-cube model can be described by a quantu m field theory\, which is analogous to a topological quantum field theory ( TQFT). [2] We will see that the gauge invariance of the field theory result s in the mobility restrictions of the topological excitations by imposing a new kind of geometric charge conservation. I will conclude by briefly disc ussing other remarkable geometry-dependent phenomenology of fracton order. For example\, I will explain why even on a manifold with trivial topology\, spatial curvature can induce a robust ground state degeneracy.\n\n[1] Vija y\, Haah\, Fu 1603.04442 \n[2] Slagle\, Kim 1704.03870 LAST-MODIFIED:20180105T135049Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI-QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170227T210000Z DTEND:20170227T223000Z DTSTAMP:20260828T094430Z UID:s84fcs47cgq6jtamepql8lvlf8@google.com CREATED:20170221T140814Z DESCRIPTION:Speaker: Anson Hook\n\nSpeaker Institution: Stanford University \n\nTitle: Bounding Milli-magnetic charged particles\n \nAbstract: Just lik e how milli-electric charged particles can exist\, so can milli-magnetic ch arged particles. We review simple ways of evading the standard quantizatio n arguments and why there are no model independent constraints on magnetica lly charged particles\, milli-charged or not. We then provide the first ev er model independent bounds coming from magnetar cooling arguments. LAST-MODIFIED:20170221T140814Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170804T200000Z DTEND:20170804T210000Z DTSTAMP:20260828T094430Z UID:3ea3php4vbnvopvfjrtv8gua3n@google.com CREATED:20170727T175511Z DESCRIPTION:Speaker: Jiehang Zhang\n\nInstitution: JQI\n\nTitle: Measuremen t aspects of statistical mechanics\, classical and quantum alike.\n\nAbstra ct:\nIs information a physical quantity? Or perhaps it is merely a result o f our logical deduction. These two don’t conflict with each other in a Baye sian framework\, as two probabilities always exist: one from the statistica l sample to be measurement\, and one from the conclusion we draw from these measurements. I will discuss the information and measurement aspects of st atistical mechanics: what happens after the moment that we stick a thermome ter into a box. This sounds classical\, but the quantum case is not much di fferent. Discussions are based on the pioneering work by E. T. Jaynes [1]\, and recent realizations and extensions to the same principle [2]. No prior knowledge is required. \n\n[1] E. T. Jaynes\, Phys. Rev. 106\, 620 (1957). \n[2] M. N. Bera\, A. Riera\, M. Lewenstein\, A. Winter. Arxiv 1707.01750 ( 2017).\n\n(The JQI summer school is for students and postdocs\, but others are welcome to join for refreshments and snacks afterward\; Discussion with refreshments and snacks at 5:00 pm) LAST-MODIFIED:20170727T175511Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170223T173000Z DTEND:20170223T183000Z DTSTAMP:20260828T094430Z UID:sufdem9t5bgjfcf1j3lj57m9p0@google.com CREATED:20170220T144855Z DESCRIPTION:*Title: “High-Power Terahertz Generation from Laser-Produced Pl asma”\n\n*PHYS 798E and ENEE 698D: Problems in Advanced Physics\; Electroph ysics\n\nSpeaker: Prof. Ki-Yong Kim\, Physics and IREAP\, U. of Md.\n\n*Abs tract:* Sandwiched between the optical and microwave regimes\, the far\ninf rared or terahertz (THz) frequency range has recently drawn special\nattent ion due to its ubiquitous nature and broad applications. THz\nradiation (or T-rays) can easily pass through non-polar materials such as\nclothing\, pa per\, plastics\, wood and ceramics. This property allows many\napplications in molecular sensing\, biomedical imaging and spectroscopy\,\nsecurity sca nners\, and plasma diagnostics. In particular\, high-power THz\ngeneration is vital for applications in nonlinear THz optics and\nspectroscopy\, and s o there is a growing demand for intense\, compact THz\nsources. One approac h is to use tabletop\, ultrashort-pulsed lasers to\nproduce coherent THz ra diation via high field plasma generation in gases\,\nbut the physics of the process is not fully understood and requires\ndetailed understanding of st rong field ionization processes in atoms and\nmolecules. In addition\, ther e are practical issues to address—Can one\ncontrol and optimize the process to make compact high-power THz sources?\nWhat are the limits on generating and detecting ultra-broadband THz\nradiation? What interesting nonlinear p rocesses can be driven by powerful\nTHz sources? All these questions will b e addressed in this talk.\n\n*Bio: * Ki-Yong Kim is Associate Professor in the Department of Physics and\nInstitute for Research in Electronics and Ap plied Physics at the University\nof Maryland\, College Park. Dr. Kim receiv ed a B.S. in physics from Korea\nUniversity\, Seoul\, South Korea\, in 1995 and the Ph.D. in physics from the\nUniversity of Maryland College Park in 2003. Dr. Kim has expertise in\nultrafast lasers\, optics\, and laser-matte r interactions with 18 years of\nresearch experience. He has authored and c o-authored 45 peer-reviewed\njournals and 98 conference/workshop papers\, a nd given 43 invited (national\nand international) presentations and served as reviewers for many\nscientific journals and grants. He has received Earl y Career Awards from\nDOE and NSF\; Postdoctoral Distinguished Performance Award at Los Alamos\nNational Laboratory in 2007\; Marshall N. Rosenbluth O utstanding Doctoral\nThesis Award from the American Physical Society in 200 4.\n LAST-MODIFIED:20170220T144855Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160512T180000Z DTEND:20160512T190000Z DTSTAMP:20260828T094430Z UID:07t0lve9f4neqojojeftabns9k@google.com CREATED:20160506T121840Z DESCRIPTION:Speaker Name: Pablo Barberis Blostein\n\nSpeaker Institution: J QI (on leave for a year from National Autonomous University of Mexico)\n\nT itle: Some thoughts about the Quantum Van Trees inequality\n\nAbstract: Whe n a parameter of a quantum system is a random variable\, the Quantum Van Tr ees inequality can be used to check if the combination of quantum measureme nt and estimator minimizes the error. In this talk we argue that\, in gener al\, the Quantum Van Trees inequality can not be saturated\; when this happ ens it is not possible to use it to know if we are using the best measureme nt strategy. We propose a modification of the Quantum Van Trees inequality and discuss possible applications. LAST-MODIFIED:20160511T194256Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180502T150000Z DTEND:20180502T160000Z DTSTAMP:20260828T094430Z UID:1od7ok1e1frad6vu8s806k6nik@google.com CREATED:20180424T135839Z DESCRIPTION:Speaker: Dr. Albert Pan\, D.E. Shaw Research

T itle: Atomic-Level Characterization of Protein-Protein Association
< br>Abstract: \;Theassociation of proteins int o stable complexes is central to an array ofbiological processes. \; Pr edicting the structures of and understanding themechanisms by which protein s associate into these complexes are outstandingchallenges in the field of molecular biology. \; Advances to ourunderstanding could also have impo rtant implications for drug discovery effortsinvolving protein-protein comp lexes\, a large and important class of therapeutictargets where progress to ward the clinic\, especially for small-molecule drugs\,has been challenging . \; To study protein-protein association\, we havedeveloped an approac h called tempered binding that combines long timescaleatomic-level molecula r dynamics simulations with simulated Hamiltoniantempering. \; We will describe the results of tempered binding simulationsin which proteins repea tedly associate into\, and dissociate from\, theircrystallographically-dete rmined \;complexstructures\, and discuss insights into pro tein-protein association mechanismsrevealed by these simulations.

LAST-MODIFIED:20180424T135916Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170307T181500Z DTEND:20170307T191500Z DTSTAMP:20260828T094430Z UID:cm9vk4t8ig22q48aqlp8g42qk4@google.com CREATED:20170124T145816Z DESCRIPTION:Speaker Name: Dr. Michael Zwolak\n\nSpeaker Institution: NIST\n \nTitle: Thermodynamic Cycle of Catalytic Nanoparticle Morphology Driven by Carbon Nanostructure Growth\n\nAbstract: During the catalytic synthesis of graphene\, nanotubes\, fibers\, and other nanostructures\, many intriguing phenomena occur\, such as phase separation\, precipitation\, and analogs o f capillary action. The underlying mechanism of these processes and their r ole in determining the catalytic products remain largely unknown. Here\, we demonstrate\, using in situ\, real-time transmission electron microscope i maging and modeling\, that the catalytic nanoparticles are driven through a nonequilibrium thermodynamic cycle of elongation and retraction\, where th e large elongation observed is a manifestation of metastability. As a tubul ar structure grows\, the particle elongates due to an energetically favorab le metal-carbon interaction that overrides the surface energy increase of t he metal. The formation of subsequent nested tubes\, however\, drives up th e particle's free energy\, but the particle remains trapped until an access ible free energy surface allows it to exit the tube and the cycle repeats. The degree of tapering determines whether such a free energy surface exists and\, ultimately\, the final product and functional catalyst lifetime. Sin ce the particle reshaping is universal for different metals\, particle size s\, carbon structures\, etc.\, our results - including predictive expressio ns - provide a unifying framework to interpret the different observations a nd suggest routes to the practical optimization of these processes for desi red end products. \n\nhttp://jacobi.umd.edu/statphys LAST-MODIFIED:20170209T200839Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170608T183000Z DTEND:20170608T200000Z DTSTAMP:20260828T094430Z UID:tninrucntucapnj9lue0s0aeis@google.com CREATED:20170502T133039Z DESCRIPTION:Speaker: Gerald Miller\n\nSpeaker Institution: University of Wa shington\n\nTitle: Electrophobic Scalar Boson and Muonic Puzzles \n\nAbstra ct: A new scalar boson which couples to the muon and proton can simultaneou sly solve the proton radius puzzle and the muon anomalous magnetic moment d iscrepancy. Using a variety of measurements\, we constrain the mass of this scalar and its couplings to the electron\, muon\, neutron\, and proton. Ma king no assumptions about the underlying model\, these constraints and the requirement that it solve both problems limit the mass of the scalar to bet ween about 100 keV and 100 MeV. We identify two unexplored regions in the c oupling constant-mass plane. Potential future experiments and their implica tions for theories with mass-weighted lepton couplings are discussed. LAST-MODIFIED:20170602T175439Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180426T193000Z DTEND:20180426T203000Z DTSTAMP:20260828T094430Z UID:6tav0thcnt2bfmto2na3ogk29i@google.com CREATED:20180423T132240Z DESCRIPTION:Speaker Name: Alessandro Geraldini\n\nSpeaker Institution: Oxfo rd University\n\nTitle: Kinetic treatment of ions in the magnetic presheath \n\nAbstract: Boundary layers are present in the thin region of a tokamak w here the Scrape-Off Layer plasma reaches the divertor or limiter target. If the magnetic field impinges with an oblique angle on the target surface\, there is a small region - called the "magnetic presheath" or "Chodura sheat h" - of size a typical ion Larmor radius\, in which ions may intersect the wall during an orbit. Typically this region is quasineutral and collisionle ss to a good approximation. In this region\, ions feel electric forces (dir ected towards the wall) that compete with the magnetic forces\, therefore t he approximately periodic ion orbits are distorted. An expression for the i on density in terms of the electrostatic potential profile is obtained by e xploiting an asymptotic expansion of the ion trajectories in the small angl e between magnetic field and wall. The full distortion of the lowest order periodic orbits is retained. The electron density is assumed to be a Boltzm ann distribution. By using an iteration scheme to impose the quasineutralit y equation\, the self-consistent electrostatic potential\, ion density and ion flow across the magnetic presheath are numerically found with some pres cribed distribution functions at the magnetic presheath entrance. The numer ical solution can be obtained for any distribution function that satisfies a solvability condition at the magnetic presheath entrance. This condition is the kinetic generalization of the fluid Chodura condition\, which states that the ion flow at the magnetic presheath entrance must be supersonic in the direction parallel to the wall. With our kinetic treatment\, we obtain the velocity distribution function of ions entering the thin non-neutral D ebye sheath. Moreover\, the dependence on the ratio of ion temperature to e lectron temperature is studied and the results of Chodura's fluid equations (valid when the ion temperature is zero) are recovered. LAST-MODIFIED:20180423T132439Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171213T180000Z DTEND:20171213T193000Z DTSTAMP:20260828T094430Z UID:3etrs8pvqrlggi6haf0bqb4kea@google.com CREATED:20171208T143604Z DESCRIPTION:Speaker Name: Jack Wimberley\n\nSpeaker Institution : Universit y of Maryland\n\nTitle : "Test of Lepton Flavor Universality with the B_c m eson at LHCb"\n\nNotes: This is also a thesis defense for Jack\, who is Has san Jawahery's student\, but is open to everyone.\n\nAbstract : The LHCb ex periment at the Large Hadron collider is a unique laboratory for studying t he properties of heavy quarks. The physics program of the experiment includ es studies of CP violation\, measurements of CKM matrix parameters\, search es for rare decays\, quarkonia studies\, and other flavor physics\, forward physics\, and new physics topics.\n\nThis talk presents a measurement of t he ratio of the branching fractions \nBr(B_c-->J/psi tau nu)/Br(B_c-->J/psi mu nu)\, which provides a test of the universality of the couplings of lep tons (e\, mu and tau) in electroweak interactions. Similar measurements in the light B mesons (B0 and B+) at BaBar\, Belle\, and LHCb are in excess of precise Standard Model predictions. LAST-MODIFIED:20171208T143700Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170206T213000Z DTEND:20170206T223000Z DTSTAMP:20260828T094430Z UID:2m5kg2jqo5l84nu15midh2rcog@google.com CREATED:20170131T134744Z DESCRIPTION:Speaker Name: Vladimir Ptuskin\n\nSpeaker Institution : IZMIRAN \, Moscow\, Russia\n\nTitle : Inverse Problem for Transport of Ultra-High E nergy Cosmic Rays in Expanding Universe\n\nAbstract : The origin of ultra-h igh energy extragalactic cosmic rays is discussed. The propagation of nucle i with energies more than 10^18 eV in expanding Universe filled with the ba ckground electromagnetic radiation is considered. The source spectrum of ex tragalactic cosmic rays for protons and nuclei up to Iron is determined fro m the observed at the Earth spectrum of particles as the solution of invers e problem of transport of ultrarelativistic nuclei. The method of regulariz ation of this mathematically incorrect problem is employed. The data of the Auger experiment on cosmic-ray energy spectrum\, the mean logarithm of mas s number and it's dispersion are used. The found energy spectra of sources are very hard and strongly depend on the composition of accelerated nuclei. \n LAST-MODIFIED:20170131T134918Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171004T183000Z DTEND:20171004T200000Z DTSTAMP:20260828T094430Z UID:61cjaqec1t8jpn6chvu52vvph5@google.com CREATED:20170928T170954Z DESCRIPTION:Speaker: Jonathan McKinney\n\nSpeaker Institution: University o f Maryland\n\nTitle: How Plasma Flows are affected by the Strong-Field Grav ity of Black Holes\n \nAbstract: The strong-field gravity of a rotating bla ck hole dominates the dynamics of plasma flows near the horizon. I discuss several of these strong-field gravity effects\,\nincluding the Meissner-li ke effect\, electromagnetically escaping the no-hair theorem\,\nelectromagn etic extraction of black hole spin energy and how it can deviate from Bland ford-Znajek\, and magnetic flux trapping on (and expulsion from) black hole s.\nI'll discuss these effects in the context of observed accretion disks\n and relativistic jets from black hole accretion systems. LAST-MODIFIED:20170928T170954Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180207T200000Z DTEND:20180207T210000Z DTSTAMP:20260828T094430Z UID:6gj15jbvh9rl7bk8ougp3rcker@google.com CREATED:20180201T155212Z DESCRIPTION:

Speaker: \; \;Prof. Marina S. Leite

Affiliatio n: Department of Materials Science and Engineering

Title: \;No vel materials for energy-relevant applications

Abstract:

< p>My research group is engaged in fundamental and applied research in novel materials for energy harvesting and storage\, and for nanophotonics. The p erformance of most photovoltaic devices is still limited by their nanoscale behavior. To reveal how the electrical and optical responses vary at relev ant length scales\, we acquire nanoscale resolved “photographs” and “movies ” of the performance of inhomogeneous materials for photovoltaics\, by mean s of novel nanospectroscopic methods. Our measurements provide a tomography of charge carrier generation\, recombination\, and collection within mater ials ranging from well-established thin films to emerging perovskites. In t he realm of energy storage\, the further development of rechargeable\, safe batteries requires the understanding of why and how the material is changi ng upon charging/discharging. We elucidate the dynamics of lithiation/delit hiation in all-solid-state batteries through in situ electron microscopy me thods. Finally\, concerning optical materials\, we overcome the constraint imposed by the pre-defined dielectric functions of noble metals by alloying \, where we have recently developed a library of their optical properties. Further\, we implemented a novel platform for the design and fabrication of these alloyed thin films and nanostructures with on demand optical respons e for applications ranging from perfect absorbers to displays and catalysis .

LAST-MODIFIED:20180201T155212Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180428T160000Z DTEND:20180428T170000Z DTSTAMP:20260828T094430Z UID:1bkbnn0qh58c3fqb77eio61f1m@google.com CREATED:20180426T141210Z DESCRIPTION:Speaker Name: James Williams\n\nSpeaker Institution: UMD \n\n Title: Exploration of Synthetic Universes in Quantum Materials\n\nAbstract : New exotic materials offer physicists the ability to emulate things that may (or may not) exist in our universe. In this talk I will summarize recen t experimental work at UMD to investigate these synthetic universes and to exploit their properties for future quantum technologies. LAST-MODIFIED:20180426T141848Z LOCATION:1201 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland Day talk by James Williams TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180324T230000Z DTEND:20180325T003000Z DTSTAMP:20260828T094430Z UID:3o0pbv6o40304ij42ekmu82ims@google.com CREATED:20180316T202729Z DESCRIPTION:Physics is Phun Community Event
Program offered both Friday 3/23 and Saturday 3/24 at 7:00 pm.

https://umdphysics.umd.edu/events/about us-outreach/physics-is-phun.html

For information: lecdemo_outreach@physic s.umd.edu LAST-MODIFIED:20180316T203529Z LOCATION:1412 Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics is Phun: The Physics of Radiation in Three Acts TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180413T170000Z DTEND:20180413T180000Z DTSTAMP:20260828T094430Z UID:231iv4094c5dsm4akli720ha47@google.com CREATED:20180403T131017Z DESCRIPTION:Speaker: Adrian Podpirka\, John Hopkins University Advanced Physics Lab

Title: Nanopattering in GeTe Phase Change Materia ls Using Heated Atomic Force Microscopy

Abstract:  \;The origin of phase-change materials dates back to 1968\, when Ovshin sk observed that a class of compounds\, namely the chalcogenide glasses\, c ould be switched rapidly and reversibly between a highly resistive state an d a conductive state by applying an electric field. It was in the early 199 0s that commercialization occurred with the use of compact disks and thus\, revolutionizing data-storage applications. The technological implementatio n of the electrical properties of phase-change materials has been pursued m ore recently\, both with optical and electronic properties.

In this talk\ , I will discuss one such material\, GeTe. In this work\, we explore the cr ystallization of amorphous germanium telluride (GeTe) thin films\, controll ed with nanoscale resolution using the heat from a thermal AFM probe. The d ramatic differences between the amorphous and crystalline GeTe phases yield embedded nanoscale features with strong topographic\, electronic\, and opt ical contrast. The flexibility of scanning probe lithography enables the wi dth and depth of the features\, as well as the extent of their crystallizat ion\, to be controlled by varying probe temperature and write speed. Togeth er\, these technologies suggest a new approach to nanoelectronic and opto-e lectronic device fabrication and a novel route to the patterning of conduct ive channels for such applications as lab-on-chips and conductive pathways.

I will conclude the talk by introducing some of the new capabilities we have at JHU/APL with chalcogenide material growth\, our growth interest s and possibilities for collaborative efforts.

LAST-MODIFIED:20180405T131616Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180914T170000Z DTEND:20180914T180000Z DTSTAMP:20260828T094430Z UID:0jp90s5l3vhkotjug9sb57dr3k@google.com CREATED:20180904T140845Z DESCRIPTION:
Title: Road to Ultra-low Switching Energy Memories to Artif icial Neurons

Speaker: T. Venky Venkatesan\, Director of the Nano In stitute\, National University of Singapore

Abstract: Memory devices are responsible for a significant fraction of the energy consumed in electr onic systems- typically 25% in a laptop and 50% in a server station. Reduci ng the energy consumption of memories is an important goal. For the evolvin g field of artificial intelligence the compatible devices must simulate a n euron. We are working on three different approaches towards these problems- one involving an organic metal centred azo complex\, the other involving o xide based ferroelectric tunnel junctions and the last involving real live neuronal circuits. \;

In the organic memristors that we have bui lt on oxide surfaces the device performance exceeds the ITRS roadmap specif ication significantly demonstrating the viability of this system for practi cal applications. More than that these organic memories exhibit multiple st ates arising from interplay of redox states and counter ion location studie d by in-situ Raman and UV-Vis measurements leading to the possibility of ne uronal systems. This organic family of molecules systems is extremely stabl e and reproducible- a significant departure from conventional organic elect ronics. On the oxide front the significant results are that ferroelectricit y is seen even in two atomic layers of BaTiO3 or BiFeO3. Oxygen vacancy mot ion can also play an important role in changing the device characteristics leading to synaptic characteristics. Last but not the least\, oxide surface s can be utilized to force neurons to grow at specific places on a surface giving the potential for fabricating live neuronal circuits.


 LAST-MODIFIED:20180907T204052Z LOCATION:2108 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171202T000000Z DTEND:20171202T013000Z DTSTAMP:20260828T094430Z UID:7nhnd1o2itkdq7f54vlkgi8som@google.com CREATED:20170925T133644Z DESCRIPTION:Physics is Phun Community Event\nProgram offered both Friday 12 /1 and Saturday 12/2 at 7:00 pm.\n\nhttps://umdphysics.umd.edu/events/about us-outreach/physics-is-phun.html\n\nFor information: lecdemo_outreach@physi cs.umd.edu LAST-MODIFIED:20170925T175828Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Modern Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160429T161500Z DTEND:20160429T171500Z DTSTAMP:20260828T094430Z UID:oogp6f3s9rl2193ela2tchm864@google.com CREATED:20160420T183327Z DESCRIPTION:Speaker Name: Neal Pisenti\n\nSpeaker Affiliation: JQI\n\nFree lunch served at 12:00\n\nTitle: Coherent three-photon process for creating metastable degenerate gasses of alkaline-earth-like atoms\n\nAbstract: Crea ting degenerate gasses of metastable alkaline-earth-like (AE) atoms is an o utstanding challenge due to large inelastic losses that prevent direct evap oration in the metastable state. However\, obtaining degenerate samples in a metastable state is necessary for some quantum simulation proposals\, and could help to advance atomic structure calculations or enable the study of quadrupolar physics. Here\, we present a coherent three-photon process to transfer degenerate AE atoms from the ground state to either 3P2 or 3P0. Si mulations of the optical bloch equations show theoretical transfer efficien cies of >~ 90% using reasonable experimental parameters in both strontium a nd ytterbium. We end with a discussion of the experimental challenges that need to be overcome to successfully realize such transfer efficiencies. LAST-MODIFIED:20160421T204242Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170912T171500Z DTEND:20170912T181500Z DTSTAMP:20260828T094430Z UID:3ivpgt9150ht4iurhnsca72ki2@google.com CREATED:20170906T143110Z DESCRIPTION:Speaker Name: Professor Yannis Kevrekidis\n\nSpeaker Institutio n: John Hopkins\n\nTitle: No Equations\, No Variables\, No Parameters\, No Space\, No Time: Data and the Computational Modeling of Complex Systems\n\n Abstract: Obtaining predictive dynamical equations from data lies at the h eart of science and engineering modeling\, and is the linchpin of our techn ology. In mathematical modeling one typically progresses from observations of the world (and some serious thinking!) first to equations for a model\, and then to the analysis of the model to make predictions. Good mathematica l models give good predictions (and inaccurate ones do not) - but the compu tational tools for analyzing them are the same: algorithms that are typical ly based on closed form equations. \n\nWhile the skeleton of the process re mains the same\, today we witness the development of mathematical technique s that operate directly on observations - data - and appear to circumvent t he serious thinking that goes into selecting variables and parameters and d eriving accurate equations. The process then may appear to the user a littl e like making predictions by "looking in a crystal ball". Yet the "serious thinking" is still there and uses the same - and some new - mathematics: it goes into building algorithms that "jump directly" from data to the analys is of the model (which is now not available in closed form) so as to make p redictions. Our work here presents a couple of efforts that illustrate this "new" path from data to predictions. It really is the same old path\, but it is travelled by new means. LAST-MODIFIED:20170906T143110Z LOCATION:IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171103T201500Z DTEND:20171103T211500Z DTSTAMP:20260828T094430Z UID:4ste7kgt6pgq8mj88t5cfnn8nn@google.com CREATED:20171026T123912Z DESCRIPTION:Speaker: Thomas Boulier\n\nAffiliation: JQI\n\nTitle: Spontaneo us avalanche dephasing in large Rydberg ensembles\n\nAbstract: Realizing ef ficient many-body quantum simulators requires an exquisite control over the coherence and the interactions between many particles. Rydberg atoms are e merging as a strong candidate for achieving the coherent control of large i nteracting systems. However recently there has been concerns due to the obs ervation of giant inhomogeneous dephasing in large ensembles. Hence the cur rent difficulties encountered for realizing Rydberg dressing for atomic ens embles of 100 atoms or more. In this talk I will review experimental eviden ces pointing toward an avalanche-like onset of off-diagonal dipole-exchange interactions\, fueled by blackbody transitions. Using several time-resolve d spectroscopic methods in a neatly controlled ensemble of ultracold Rydber g atoms held in a 3D optical lattice\, I will present data looking into the dynamical description of this highly-correlated\, many-body avalanche deph asing process. Possible ways to mitigate the decoherence will be presented. \n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171026T123912Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161213T160000Z DTEND:20161213T170000Z DTSTAMP:20260828T094430Z UID:n87b9cf92bahna7g5c9r099roo@google.com CREATED:20160907T161049Z DESCRIPTION:Speaker: Subir Sachdev (Harvard)\n\nTitle: SYK models\, strange metals\, and black holes\n\nAbstract: The Sachdev-Ye-Kitaev (SYK) models p rovide solvable realizations of diffusive metallic states without quasipart icle excitations. Explicit holographic duals of the SYK models can be const ructed\, in terms of black holes with a near-horizon AdS2 geometry. I will also compare the SYK models with more realistic models of the strange metal s in the cuprates. A common thread connecting these models is the remarkabl e connection between many-body quantum chaos and diffusive thermal transpor t in states of quantum matter without quasiparticle excitations.\n\nLocatio n: 2205 John S. Toll Physics Building\n\nHost: Xiao Li & Ching-Kai Chiu\n\n http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20161028T141750Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170222T190000Z DTEND:20170222T200000Z DTSTAMP:20260828T094430Z UID:1trmesurh8fvssnd8297ii1ork@google.com CREATED:20170216T001145Z DESCRIPTION:Speaker Name: Hyung Mok Lee\n\nSpeaker Institution : Seoul Nati onal University\n\nTitle : Properties of Black Hole Binaries formed Dynamic ally in Dense Star Clusters\n\nAbstract : The advanced detectors of gravita tional waves detected two black hole binary mergers and one candidate. Such binaries are either formed by evolution of binary systems composed of two massive stars through dynamical processes in dense stellar systems. I will focus on the dynamical scenarios originating from globular clusters. The bi naries are predominantly formed via three-body processes and their orbits u ndergo subsequent evolution toward more compact configuration through inter actions with other black holes. Eventually majority of black hole binaries get ejected from the cluster in a few relaxation time. We derive the distri bution of semi-major axis as a function of the escape velocity of the host cluster based on the numerical experiments. Some fraction of those ejected binaries will merge within Hubble time. We also considered the clusters wit h black hole mass function. Because of the mass segregation in early phase of the dynamical evolution the binaries are predominantly formed between bl ack holes with similar mass. Consequently\, the ratios of the primary and s econdary black holes are close to 1:1 and binaries with mass ratio greater than 2:1 will be very unlikely. Because of the same reason\, binaries compo sed of a black hole and a neutron star will be very rare among dynamical bi naries. The estimation of the expected frequency of gravitational merger ev ents of dynamically formed black hole binaries is difficult\, but could be as high as ~ several 10s per year per cubic giga parsec.\n LAST-MODIFIED:20170216T001146Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravitational Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160413T190000Z DTEND:20160413T200000Z DTSTAMP:20260828T094430Z UID:29d5uc1alsgfiuvnae9vsvhav4@google.com CREATED:20160408T205506Z DESCRIPTION:Speaker Name: Prof. Michael Gershenson\n\nSpeaker Institution : Department of Physics and Astronomy\, Rutgers University\n\nTitle : Parity -protected Josephson qubits\n\nAbstract : We have developed two novel Josep hson circuits intended as prototypes of protected qubits whose logical stat es are decoupled from the environment by encoding them in a parity of a lar ge number. The first type\, the so-called charge-pairing qubit [1]\, repres ents a chain of two Josephson elements characterized by the π periodicity o f the phase dependence of their Josephson energy 𝐸𝐽𝑐os(2𝜑) (the so-call ed Josephson rhombi [2]). The second type\, the flux-pairing qubit [3]\, co nsists of a 4π periodic 𝐸𝐽𝑐os(𝜑/2) Josephson element (a Cooper pair box with the e charge on the central island) shunted by a superinductor [3]. T he lowest-energy quantum states of the charge-pairing qubit are encoded in the parity of Cooper pairs on a superconducting island flanked by the Josep hson rhombi. The flux-pairing qubit encodes its quantum states in the parit y of magnetic flux quanta inside a superconducting loop. In my talk\, I wil l introduce the idea of parity protection and outline our recent work towar ds better flux-pairing qubits and superinductors as essential elements of p rotected qubits.\n1. M.T. Bell\, J. Paramanandam\, L.B. Ioffe\, and M.E. Ge rshenson. Protected Josephson Rhombus Chains. Phys. Rev. Lett. 112\, 167001 1-5 (2014).\n2. S. Gladchenko\, D. Olaya\, E. Dupont-Ferrier\, B. Douçot\, L.B. Ioffe\, and M.E. Gershenson. Superconducting Nanocircuits for Topolog ically Protected Qubits. Nature Physics 5\, 48-53 (2009).\n3. M.T. Bell\, W . Zhang\, L. B. Ioffe\, and M. E. Gershenson. Spectroscopic Evidence of the Aharonov-Casher Effect in a Cooper Pair Box. Phys. Rev. Lett. 116\, 107002 (2016).\n4. M.T. Bell\, I.A. Sadovskyy\, L.B. Ioffe\, A.Yu. Kitaev\, and M .E. Gershenson. Quantum Superinductor with Tunable Non-Linearity. Phys. Rev . Lett. 109\, 137003 (2012).\n LAST-MODIFIED:20160408T205633Z LOCATION:LPS SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170629T150000Z DTEND:20170629T160000Z DTSTAMP:20260828T094430Z UID:6ui17fvrhpsokj5bf7craj9pk4@google.com CREATED:20170613T131909Z DESCRIPTION:Speaker: Robin Blume-Kohout\n\nSpeaker Affiliation: Sandia Nati onal Lab\n\nTITLE: Fantastic errors and where to find them \n\nABSTRACT: Qu antum processors exist — several fully programmable devices with 5-16 qubit s exist today\, at least one of which (the IBM Quantum Experience) is publi cly accessible. Running real circuits on real quantum processors is forcing us to recognize and tackle new\, “exotic” errors. After reviewing some of the “standard” frameworks for quantum errors\, I’ll discuss ongoing work in Sandia’s QCVV group on: (1) how to test and validate error models of any k ind\, and (2) how to conceptualize\, model\, test\, and characterize novel error modes including: leakage\, drift\, crosstalk\, context-dependence\, a nd faulty measurements in the middle of circuits. LAST-MODIFIED:20170613T132025Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170303T180000Z DTEND:20170303T190000Z DTSTAMP:20260828T094430Z UID:nskt4vh85k2lr1bpe627v0n9g0@google.com CREATED:20170203T202624Z DESCRIPTION:Speaker Name: Xiaoxing Xi\n\nInstitution: Temple University\, P rofessor of Physics\n\nTitle: U.S.A. vs. Xiaoxing Xi: Why It Matters\n\nAbs tract: As Interim Chair of Temple University’s Physics Department\, May 20\ , 2015 was a normal day for me filled with work on my class\, research\, pr omotion of colleagues\, and a university task force I was chairing. I had g iven a public lecture for “Pint of Science\,” a science festival\, at an Ir ish pub before picking up my wife at the airport\, who was returning from a n overseas conference trip. My elder daughter had come home a day earlier f rom college for a few days. We made a plan to visit a restaurant to try the ir famous Korean fried chicken. All of this was suddenly and forever change d a few hours later when I was awoken by the urgent pounding on my door. I was arrested by armed FBI agents and indicted by the U.S. government for sh aring protected U.S. company technology with China. The indictment was dism issed in September after it had become clear that I did not share the prote cted technology with China. My case has raised serious concerns about inter national collaborations in science and technology\, civil rights\, and the long-term national security and economic future of the United States. LAST-MODIFIED:20170303T163447Z LOCATION:2108 Chem/Nuc Bldg\, College Park\, MD SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160715T180000Z DTEND:20160715T193000Z DTSTAMP:20260828T094430Z UID:ts7sdndunk6odd4mf7ulr0bvv0@google.com CREATED:20160617T131424Z DESCRIPTION:Speaker: Abdelhak Djouadi\n\nSpeaker Institution: Université Pa ris-Sud - Laboratoire de Physique Theorique\n\nTitle: Implications of a Pos sible 750 GeV Scalar Resonance\n \nAbstract: If the recent indications of a possible state with mass of 750 GeV decaying into two photons reported by ATLAS and CMS in LHC collisions at 13 TeV were to become confirmed\, the p rospects for future collider physics at the LHC and beyond would be affecte d radically. We consider three scenarios for the possible resonance: one in which it is a singlet scalar or pseudoscalar whose production and decays a re due to loops of coloured and charged fermions\, an another in which it i s a superposition of (nearly) degenerate CP-even and CP-odd Higgs bosons in a two-Higgs doublet model also with additional fermions and the minimal su persymmetric standard model with light charginos or stop squarks to account for the large two-photon decay rate. We explore the implications of these benchmark scenarios for the production of the resonance and its new partner s at colliders. LAST-MODIFIED:20160705T131700Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170912T160000 DTEND;TZID=America/New_York:20170912T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20170912T160000 CREATED:20170809T180226Z DESCRIPTION:Luciano Pietronero\, University of Rome\, "La Sapienza”\, Ital y\n\nHosted by Victor Yakovenko\n\nEconomic Complexity\n\nEconomic Complexi ty (EC) is a new field of research that consists in a radically new methodo logy. It describes economics as evolutionary process of ecosystems made of industrial and financial technologies that are all globally interconnected. The approach is multidisciplinary addressing emerging phenomena in economi cs from different points of view: analysis of complex systems\, scientific methods for systems and the recent developments in Big Data. This approach offers new opportunities to constructively describe technological ecosystem s\, analyse their structures\, understand their internal dynamics\, as well as to introduce new metrics. This approach provides a new paradigm for a f undamental economic science based on data and not on ideologies or interpre tations\, which is becoming a necessary choice in a highly interconnected a nd globalized world\, especially after the great financial and economic cri sis of recent years.\n\nEconomic Complexity\, in addition to a new vision f or a data-based scientific approach for fundamental economics\, offers a ne w set of metrics able to quantify the competitiveness of countries\, of tec hnological sectors\, measuring future development prospects for nations as well as for large companies. Those metrics have already shown to have a maj or impact for policy makers and for industry applications economics and fin ance. Over the last year\, the World Bank (WB) has extensively tested and a dopted this new methodology for its strategic analysis.\n\nA crucial elemen t of our methodology is a radically new approach to the problem of Big Data . Big Data is often associated with "big noise" as well as a subjective amb iguity related to how to structure the data and how to assign them a value that should reflect many arbitrary parameters. In the case of the evaluatio n of the industrial competitiveness of a country\, the required parameters for such an analysis could more than one hundred. A key point approach EC i s to go from 100 parameters to zero parameters and obtain results which can be tested in a scientific perspective. This is done by focusing on the dat a in which the signal to noise ratio is optimal and developing iterative al gorithms in the spirit\, but other than Google\, and optimized to the econo mic problem in question. In particular the study of a country or a company is not done at the individual level but through the global network in which it is inserted. In this way you get the Fitness of the countries and the C omplexity of the products.\n\nThe dynamics in the new GDP-Fitness space [1] (opens up to a completely new way for monitoring and forecasting. Then\, t he taxonomy of products and their evolutionary dynamics is built through ma chine learning methods. Finally\, the same thing is applied to patents and technologies\, two elements that open up the possibility of analyzing the c ore elements of the innovation process.\n\n[1] M. Cristelli\, A. Tacchella\ , L. Pietronero: The Heterogeneous Dynamics of Economic Complexity\, PLOS O ne 10(2): e0117174 (2015) and Nature editorial on EC:\n\n:http://www.nature .com/news/physicists-make-weather-forecasts-for-economies-1.16963\n \nLucia no Pietronero studied physics in Rome and was a research scientist\nat Xero x Research in Webster (1974) and Brown Boveri Research Center (CH) 1975-\n1 983. He then moved to Univ. of Groningen (NL)\, where he was professor of\n Condensed Matter Theory (1983-87). Since 1987 he is professor of Physics at the\nUniversity of Rome "\;Sapienza”. Founder and director of the Inst itute for Complex\nSystems of CNR (2004-2014). Broad international experien ce in academic and\nindustrial enviroments. The scientific activity is of b oth fundamental and applied\nnature\, with a problem oriented interdiscipli nary perspective. Development of novel\nand original views in all the areas of activity. Leader of a generation of joung\nscientists who are protagoni sts of the complexity scene internationally.\nIn 2008 he received the Fermi Prize (highest award of the Italian Physical Society).\nResearch interests Condensed Matter Theory\; High-temperature superconductivity\;\nStatistica l Physics\; Fractal Growth\; Self-Organized- Criticality\; Complex Systems and\nits interdisciplinary applications. Recent activity: http://www.lucian opietronero.it/\n LAST-MODIFIED:20170815T131731Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180425T200000Z DTEND:20180425T213000Z DTSTAMP:20260828T094430Z UID:0mghbb2koahnegff2e7kvj30v8@google.com CREATED:20180423T172204Z DESCRIPTION:Speaker Name: Yangyang Cheng

Speaker Institution : Corne ll University
Title : "Long Live the Dark Side - and New Ways to Get The re"

Abstract : The existence of dark matter (DM ) is one of the most striking evidence of physics beyond the Standard Model . Despite a plethora of astrophysical and cosmological observations\, the n ature of DM remains unknown\, and stringent constraints have been placed on DM as Weakly Interacting Massive Particles (WIMPs) through (in)direct dete ction and collider experiments. If nature contains more than just one type of DM particle\, but a more complex dark sector\, some of the dark sector p articles may have a longer lifetime before decaying to visible particles an d DM candidates\, creating striking signatures at collider experiments and opening up a new paradigm for DM searches. This talk presents the physics m otivations for a few of the dark sector models\, their searches at the CMS experiment\, and existing challenges. The talk then describes the upgrade s cope for the CMS experiment at the High-Luminosity LHC\, and the ensuing ta ntalizing prospects for dark sector searches with the upgrade detector. \; LAST-MODIFIED:20180423T172433Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170201T200000Z DTEND:20170201T210000Z DTSTAMP:20260828T094430Z UID:9uv766vcqi3c9hdkmd03c1ptf0@google.com CREATED:20170126T135601Z DESCRIPTION:Speaker Name: Gang Qu\n\nSpeaker Institution : Department of El ectrical and Computer Engineering\, University of Maryland College Park\n\n Title : Physical Feature based Authentication for CPS/IoT\n\nAbstract : In many cyber physical systems (CPS) and the Internet of Things (IoT) applicat ions\, resources like CPU\, memory\, and battery power are limited in that they cannot afford the classic cryptographic security solutions. Meanwhile\ , the security requirement on these systems/devices is not as high as the t raditional secure systems. In this talk\, we use authentication as an examp le to demonstrate how hardware and physical characteristics can help to bui ld lightweight security primitives such as authentication protocols. More s pecifically\, we will report two pieces of our recent work that utilize mem ristor and voltage over scaling (VoS) respectively for user and device auth entication. We will also discuss our ongoing work on polymorphic circuit an d its potential applications in security. LAST-MODIFIED:20170126T135738Z LOCATION:LPS Seminar room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170511T163000Z DTEND:20170511T173000Z DTSTAMP:20260828T094430Z UID:5jmgi7hfcek9952k39911vgovc@google.com CREATED:20170418T131504Z DESCRIPTION:Speaker Name: Yoav Lahini\n\nSpeaker Institution : Harvard Univ ersity\n\nTitle : Non-Monotonic Aging and Memory Retention in Disordered Me chanical Systems\n\nAbstract: From materials such as polymers and glass to properties of interfaces leading to friction and even earthquakes\, many di sordered systems exhibit a similar repertoire of far-from-equilibrium behav iors such as non-exponential relaxations\, aging and memory effects. Yet\, in spite of numerous studies of these recurring motifs\, identifying the me chanisms underlying the unusual dynamics of disordered systems remains a ch allenge. I will describe the observation of slow relaxations\, aging and me mory effects - hallmarks of glassy dynamics – in two disordered mechanical systems: crumpled thin sheets and elastic foams. In particular\, I’ll repor t the observation of a non-monotonic aging response that can last many hour s. I will then describe ongoing experiments that exploit the macroscopic na ture of these systems to try and uncover the underlying mechanisms. The exp erimental results are in good agreement with a theoretical model recently u sed to describe observations of monotonic aging in several glassy systems. This suggests not only a general mechanism\, but also that the non-monotoni c behavior we observe may be generic and that a-thermal systems can show ge nuine glassy behavior. LAST-MODIFIED:20170418T131504Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180223T180000Z DTEND:20180223T190000Z DTSTAMP:20260828T094430Z UID:6gfr0852c0rn118ffh4kjpue28@google.com CREATED:20180215T160002Z DESCRIPTION:Speaker: Adam Cruezinger\, NIST Center for Automotive Li ghtweighting

Title: Errors in Phase Fraction Measurements Cau sed by Crystallographic Texture

Abstract: \;The NIST Center for Automotive Lightweighting (NCAL) has several efforts to assist the automotive industry in relevant measurement problems \, as many automotive manufacturers have identified vehicle lightweighting as the primary means to meet current and upcoming fuel economy targets. One such problem is measurement of phase fractions. A promising  \;type of material under development is referred to as 3rd Generation Advanced High Strength Steels (3GAHSS). These steel alloys have high strength and high el ongation\, obtained by an initial mixture of phases and selective transform ation during deformation. Therefore\, accurate measurements of the phase fr action in the as-processed steel and as a function of deformation are key.& nbsp\; Unfortunately\, despite having used steel for nearly 4\,000 years\, this measurement remains a challenge. One of the largest factors affecting phase fraction measurements is crystallographic texture\, or preferred orie ntation. Texture is inherent in the processing and deformation\, and strong ly affects diffraction (x-ray and neutron) phase fraction measurements.&nbs p\; While it is widely recognized that crystallographic texture affects pha se fraction measurements\, the effect has largely been unquantified. \; This presentation will discuss methods to assess errors in phase fraction measurements caused by texture and techniques to minimize them. \;  \; LAST-MODIFIED:20180216T164244Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180509T200000Z DTEND:20180509T213000Z DTSTAMP:20260828T094430Z UID:42njcjb1cn7mmo12054i5vuvbc@google.com CREATED:20180504T153117Z DESCRIPTION:Speaker Name: Reyco Henning\n\nSpeaker Institution: University of North Carolina\, Chapel Hill\n\nTitle: Recent Results for the MAJORANA D EMONSTRATOR\n\nAbstract: The MAJORANA DEMONSTRATOR (MJD) is a 44-kg array o f low-background germanium detectors of which 30kg is made from detectors e nriched to 88% in 76Ge. MJD is operating a mile underground in the Sanford Underground Research Laboratory in Lead\, SD. Its main purpose is to search for the neutrinoless double-beta decay of 76Ge and to demonstrate the tech nical feasibility of a tonne-scale Ge-based neutrinoless double-beta decay experiment. In this talk I will review the motivation\, design and construc tion of the MJD\, as well as recent results for a the search for neutrinole ss double-beta decay and other BSM physics. I will also discuss future plan s for MJD and a proposed tonne-scale Ge-based experiment\, LEGeND. LAST-MODIFIED:20180504T192349Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161003T200000Z DTEND:20161003T210000Z DTSTAMP:20260828T094430Z UID:2jfsbvo6p82vbci98njud9qsoo@google.com CREATED:20160928T162121Z DESCRIPTION:Speaker Name: Dr. Otger Campàs \n\nSpeaker Institution: Univ ersity of California at Santa Barbara\n\nTitle: Mechanical Control of Cell and Tissue Morphogenesis\n\nAbstract: The sculpting of cells and tissues into their functional morphologies requires a tight spatiotemporal control of their mechanics. Despite its relevance\, little is known about how mecha nics affects/controls cellular and developmental processes and\, more speci fically\, morphogenesis. In this talk\, I will first describe the role of m echanics in sculpting individual walled cells\, using the mating projection of budding yeast as motivating example. Our results indicate that describi ng the cell wall as a growing viscous shell with inhomogeneous viscosity is sufficient to understand the experimental observations\, as long as a mech anical feedback is present in the system. Combining theoretical and experim ental approaches\, we show that a genetically-encoded mechanical feedback s tabilizes cell morphogenesis. Beyond the cellular scale\, I will describe t wo new microdroplet-based techniques that we have recently developed to dir ectly quantify mechanical forces and mechanical properties in situ within l iving tissues and developing organs. Using these techniques we show that th e sculpting of the vertebrate body axis entails spatially-varying tissue me chanical properties along the anteroposterior axis. These findings reveal t hat the spatiotemporal control of mechanical properties may constitute a fu ndamental mechanism underlying both cell and tissue morphogenesis.\n LAST-MODIFIED:20160929T175346Z LOCATION:Marker Seminar Room (0112)\, Chemistry Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar - Mechanical Control of Cell and Tissue Morphoge nesis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171108T180000Z DTEND:20171108T190000Z DTSTAMP:20260828T094430Z UID:1uishuls05jaiuq39eomj5j4vf@google.com CREATED:20171024T125700Z DESCRIPTION:Speaker: Chunhao Wang\n\nSpeaker affiliation: Waterloo\n\nTitle : Simulating the evolution of Markovian open quantum systems on quantum com puters\n\nAbstract: Simulating the evolution of quantum systems becomes one of the most appealing tasks researchers hope to perform when small quantum computers are emerging. The simulation of Hamiltonian evolution has been w ell studied in previous results: the best known gate complexity is $O(t\\\, \\polylog(t/\\epsilon))$\, where $t$ is the evolution time and $\\epsilon$ is the precision. In this talk\, we consider simulating the evolution of a class of more generalized systems: the Markovian open quantum systems (a.k. a Lindblad evolution). We first present an efficient quantum algorithm for simulating such evolution with gate complexity $O(t\\\,\\polylog(t/\\epsilo n))$. Then we argue that it is impossible to achieve this linear dependency in $t$ by simply reducing Lindblad evolution to Hamiltonian evolution in " the Church of larger Hilbert space''. LAST-MODIFIED:20171101T122933Z LOCATION:CSS 3100A SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180409T110000 DTEND;TZID=America/New_York:20180409T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180409T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: \;Liang Jiang

Affiliatio n: Yale

Title:

Abstract: LAST-MODIFIED:20180309T155743Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161017T200000Z DTEND:20161017T210000Z DTSTAMP:20260828T094430Z UID:fnk3oi35hu40gqor979e57nl08@google.com CREATED:20161011T135300Z DESCRIPTION:Speaker Name: Dr. Iqbal Hamza\n\nSpeaker Institution: Univers ity of Maryland College Park\n\nTitle: Excitement on non-excitable cells: glutamate-like receptors and calcium homeostasis in plant cells\n\nAbstract : Iron deficiency is the most common nutritional disorder in the world and heme-iron is the most bioavailable form of iron for human consumption. Fro m a cell biological perspective\, hemes are critical prosthetic groups for important biological processes\, and in eukaryotes it is synthesized in the mitochondrial matrix. Free heme is a hydrophobic and cytotoxic macrocycle. How is heme transported through cellular membranes for incorporation into specific hemoproteins that reside in various organelles? Our work with the invertebrate animal model Caenorhabditis elegans has demonstrated that this roundworm is exceptional because it does not synthesize heme but rather ut ilizes environmental heme to manufacture heme-containing proteins. Genomic screens in C. elegans identified several novel genes which we termed Heme R esponsive Genes (HRGs). HRG1\, the first metazoan heme importer/transporter \, is a permease with four transmembrane domains and is conserved in verteb rates. Depletion of hrg-1 paralogs in worms causes disruption of organismal heme sensing. Zebrafish with lower levels of Hrg1 reveal profound defects in erythropoiesis. In human and mouse tissues\, Hrg1 is strongly expressed in macrophages of the reticuloendothelial system and traffics to the phagol ysosomal membranes during erythrophagocytosis to transport heme for heme re cycling. Additional genome-wide screens identified new molecules involved i n organismal heme homeostasis. Our recent findings on novel eukaryotic heme trafficking pathways and its relevance to vertebrate development will be d iscussed. \n LAST-MODIFIED:20161011T200955Z LOCATION:Marker Seminar Room (0112)\, Chemistry Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180123T181500Z DTEND:20180123T191500Z DTSTAMP:20260828T094430Z UID:1f1hh2qhvg6i5j8citrtob11nj@google.com CREATED:20180124T174337Z LAST-MODIFIED:20180124T174337Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physical Science Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170209T153000Z DTEND:20170209T163000Z DTSTAMP:20260828T094430Z UID:c7hba6ekr3lacp12rj0rrk90eg@google.com CLASS:PUBLIC CREATED:20170125T143158Z DESCRIPTION:Speaker: Ken Baldwin\; Australian National University\n\nGhost Imaging with Atoms\n\nGhost imaging is a technique - first realized in quan tum optics - that uses the cross-correlation between particles in two separ ate beams\, one of which passes through the object to a bucket (single-pixe l) detector\, while the second is measured by a high spatial resolution (mu lti-pixel) detector but never interacts with the object. Neither detector c an reconstruct the image independently. Here we report on the first realisa tion of ghost imaging of a macroscopic object using massive particles. In o ur experiment\, the two beams are formed by correlated pairs of ultracold m etastable helium atoms originating from two colliding Bose-Einstein condens ates (BECs). We use higher-order Kapitza-Dirac scattering to generate the l arge number of correlated atom pairs required\, enabling the creation of a ghost image with good visibility and sub-millimetre resolution. LAST-MODIFIED:20170125T143158Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SPECIAL SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161006T163000Z DTEND:20161006T173000Z DTSTAMP:20260828T094430Z UID:02qla29uas6fgt7devl7s5uais@google.com CREATED:20160825T180750Z DESCRIPTION:Speaker Name: Ira Schwartz\n\nSpeaker Institution : Naval Resea rch Laboratory\n\nTitle: The Force of Fluctuations: Analysis and Control of Extinctions on Networks\n\nAbstract: Noise in various forms is known to cause switching between states\, create new meta-stable states\, and form global dynamical structures. In this talk\, I will review some previous wor k on the effects of noise in static and adaptive networks\, and show how to extend the theory to heterogeneous networks with a specified degree distri bution. Applications will be to epidemic spread and novel optimal network c ontrol in large populations. Specifically\, we have developed new mathemati cal and computational techniques demonstrating that both highly connected i ndividuals and those with a few connections should be targeted in specific proportions\, using vaccination or treatment\, in order to minimize mean ex tinction times. The optimal approach gives orders of magnitude improvement over known strategies. LAST-MODIFIED:20160825T181212Z LOCATION:ERF 1207 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - The Force of Fluctuations: Analysis and Control of Extinctions on Networks TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160624T161500Z DTEND:20160624T171500Z DTSTAMP:20260828T094430Z UID:3u9q7midpk872g64i945p0cdvc@google.com CLASS:PUBLIC CREATED:20160617T142545Z DESCRIPTION:Speaker Name: Zachary Eldredge\n\nSpeaker Institution: JQI\, Qu ICS\n\nLocation and Time: PSC 2136 at 12:15 (Free lunch served at 12:00)\n\ nTitle: Self-organization of atoms coupled to a chiral reservoir\n\nAbstrac t: Tightly confined modes of light\, as in optical nanofibers or photonic c rystal waveguides\, can lead to large optical coupling in atomic systems\, which mediates long-range interactions between atoms. These one-dimensional systems can naturally possess couplings that are asymmetric between modes propagating in different directions. Strong long-range interaction among at oms via these modes can drive them to a self-organized periodic distributio n. In this talk\, we examine the self-organizing behavior of atoms in one d imension coupled to a chiral reservoir. We determine the solution to the eq uations of motion in different parameter regimes\, relative to both the det uning of the pump laser that initializes the atomic dipole-dipole interacti ons and the degree of reservoir chirality. In addition\, we calculate possi ble experimental signatures such as reflectivity from self-organized atoms and motional sidebands. LAST-MODIFIED:20160617T152344Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161109T200000Z DTEND:20161109T210000Z DTSTAMP:20260828T094430Z UID:kqcm42l72h73f0j1k1p7sgv9t4@google.com CREATED:20161102T135639Z DESCRIPTION:Speaker Name: Dr. Kevin Osborn\n\nSpeaker Institution : The Lab oratory for Physical Sciences and the Joint Quantum Institute at the Univer sity of Maryland\n\nTitle : Autonomous Reversible Fluxon Logic Gates\n\nAbs tract : Superconducting reversible computing offers new technological oppor tunities\, partially due to low-damping circuits\, which are not realizable in CMOS. The technology is found in reversible digital computing as well a s the more widely studied field of quantum computing. In the former\, the g oal is to realize digital logic with lower irreversible work (or energy exp ended) per operation. Just as multiple superconducting logic types are deve loped for high energy-efficiency in the US\, an even-more efficient digital logic is developed in Japan which is aided by reversibility. The latter lo gic uses adiabatic drive\, which is understood within a known physical mode l of computing. Other useful reversible models\, non-adiabatic or not\, wit h practical implementations seem absent. We have developed a new supercondu cting fluxon logic that specifically uses the Josephson vortex type of flux on in the so-called long Josephson junction. This follows from the Sine-Gor don equation and contrasts most superconducting logic which moves localized flux between cells. The long Josephson junctions (LJJs) are connected toge ther at simple interfaces containing a few Josephson junctions which enable s interesting autonomous fluxon dynamics\, i.e.\, operating without a drive . The dynamics include forward scattering\, from one LJJ to another\, and t he option for fluxon polarity inversion (conversion from fluxon to antiflux on). We find these dynamics are explained with a reduced coordinate analysi s\, using a fluxon and mirror-antifluxon pair for each connecting LJJ. The structures are made to utilize the natural dynamics in the structure with t he passive yet interesting dynamic boundary condition set by the interface and surrounding highly nonlinear systems. When the fluxon and antifluxon ar e used to encode the bit states\, the dynamics in the two LJJ structures co nstitute one-bit gate which is either NOT or Identity type. An autonomous r eversible 2-bit gate\, using four LJJs and a generalized interface\, is mad e using symmetry from the 1-bit gates. Energy loss is less than or equal to 3% of the incident fluxon energy in the gates\, and provides motivation fo r further research. The robustness of the gates to parameter variations has been studied and provides encouragement for future experiments. LAST-MODIFIED:20161102T141008Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar - Autonomous Reversible Fluxon Logic Gates TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170201T203000Z DTEND:20170201T220000Z DTSTAMP:20260828T094430Z UID:b6u3n656b3m21pb5mtp7b32u5c@google.com CREATED:20170123T144630Z DESCRIPTION:Speaker: Martin Hoferichter\n\nSpeaker Institution: University of Washington\, Institute for Nuclear Theory\n\nTitle: Nuclear Physics for Beyond-the-Standard-Model Searches\n\nAbstract: Precision measurements of l ow-energy observables can provide constraints on physics beyond the Standar d Model that are complementary to direct searches at the energy frontier\, often extending the sensitivity to scales not directly accessible at high-e nergy colliders. However\, in order to unambiguously establish anomalies th at signal departures from the Standard Model or at least extract limits on the New-Physics parameter space\, calculations of the relevant low-energy n uclear physics with controlled uncertainties\, in terms of hadronic correct ions or nuclear matrix elements\,\nare becoming increasingly important. In the talk\, this interplay between nuclear and particle physics will be disc ussed in the context of the anomalous magnetic moment of the muon\, direct- detection searches for dark matter\, and lepton flavor violation. LAST-MODIFIED:20170124T135920Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171109T123000 DTEND;TZID=America/New_York:20171109T133000 RRULE:FREQ=WEEKLY;COUNT=4;BYDAY=TH EXDATE;TZID=America/New_York:20171123T123000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h_R20171109T173000@google.com CREATED:20170830T181615Z DESCRIPTION:Speaker:\n\nTitle: \nAbstract: TBA LAST-MODIFIED:20170830T183129Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170510T200000Z DTEND:20170510T210000Z DTSTAMP:20260828T094430Z UID:cqpff75dqbuh59h1965cstvdcs@google.com CREATED:20170502T192541Z DESCRIPTION:Speaker Name: Dr. Chris Crabtree\n\nSpeaker Institution : Naval Research Laboratory\n\nTitle : Nonlinear Whistler Mode Physics: Space and Laboratory Applications\n\nAbstract : Whistler mode waves are an important electromagnetic emission that are observed in phenomenon called chorus in t he radiation belts around magnetized planets. Chorus has a frequency that c hanges as a function of time due to the nonlinear interaction with resonant electrons. These wave modes are thought to be responsible for the energiza tion of radiation belt particles to relativistic energies and thus are impo rtant to understand in detail for space weather applications. Recent experi ments in the U.S. Naval Research Lab (NRL) Space Physics Simulation Chamber (SPSC) have been performed with an injected helical energetic electron bea m. These experiments show complicated frequency-vs-time characteristics tha t resemble whistler mode chorus in the radiation belts. In this talk\, we w ill describe the first Bayesian spectral analysis for waveform data from sp ace and laboratory measurement. This synergistic analysis of lab and space data has revealed interesting characteristics of the wave modes previously unseen in the in-situ data. This has also inspired a new self-consistent no nlinear Hamiltonian approach to explain the nonlinear physics of the chorus phenomenon. LAST-MODIFIED:20170502T192642Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY: Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161018T171500Z DTEND:20161018T181500Z DTSTAMP:20260828T094430Z UID:u983gh311u67gv99e7apk9cct0@google.com CREATED:20161011T140531Z DESCRIPTION:Speaker Name: Professor Adam Willard\n\nSpeaker Institution : M IT\n\nTitle : How Does Interfacial Disorder Drive the Dissociation of Bound Electron-hole Pairs in Molecular Semiconductors?\n\nAbstract : One of the fundamental microscopic processes in photocurrent generation is the dissoci ation of neutral photo-excitations (i.e.\, Frenkel excitons) into free char ge carriers (i.e.\, electrons and holes). This process requires the physica l separation of oppositely charged electrons and holes\, which are held to together by an attractive electrostatic binding energy. In traditional inor ganic-based photovoltaic (PV) materials\, this binding energy is generally small and easily overcome\, however\, in organic-based PVs (OPVs) the excit on binding energy can significantly exceed thermal energies. The inability of bound charges to overcome this large binding energy has been implicated as a primary source of efficiency loss in OPVs. Here I present results from our recent efforts to explore the role of static molecular disorder in med iating this process. Using a simple lattice model of exciton dynamics we de monstrate that random spatial variations in the energetic landscape can mit igate the attractive Coulomb interaction between electrons and holes. We sh ow that this effect manifests as a reduction in the free energy barrier for exciton dissociation that grows more pronounced with increasing disorder. By considering the competition between this thermodynamic effect and the di sorder-induced slowing of dissociation kinetics we demonstrate that exciton dissociation yields are expected to depend non-monotonically on the degree of static LAST-MODIFIED:20161011T140726Z LOCATION:Room 1116\, IPST Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170427T163000Z DTEND:20170427T173000Z DTSTAMP:20260828T094430Z UID:vu8qr67744758r6lpp2527vi4s@google.com CREATED:20170424T153334Z DESCRIPTION:PHYS 798E and ENEE 698D\n\nTitle: “Laser Fusion Research at the U.S. Naval Research Laboratory: The Challenges and Progress in Meeting the Challenges of Achieving Inertial Fusion with Lasers”\nSpeaker : Dr. Steve Obenschain\n\nAffiliation: Head of Laser Plasma Branch\, Plasma Physics Division\, Naval Research Laboratory\nAbstract: Inertial confineme nt fusion (ICF) would involve the compression and ignition of frozen deuter ium-tritium “fuel“ contained within few mm diameter pellets. The most devel oped approach involves use of high-energy high-power lasers to drive the im plosion. This is being attempted either by directly illuminating and ther eby heating the pellet surface\, or the indirect-drive approach where the l aser beams heat the inner wall of a gold hohlraum containing the pellet and the x-rays from the heated wall drive the pellet implosion. In both cases the pellet surface is ablated and the thrust from it drives the pellet impl osion to speeds of several hundred km/sec. Most inertial fusion research is being done using frequency-tripled Nd:glass lasers operating at λ=351 nm. Short laser wavelength improves the coupling efficiency to the target and a llows operating at higher laser intensity before undesired laser-plasma ins tability appears. The laser fusion program at the Naval Research Laboratory (NRL) has developed and utilized a different krypton fluoride (KrF) gas la ser technology.* The KrF laser has substantial target physics and technolog ical advantages towards achieving robust direct-drive implosions that ignit e and provide high energy gain. The physics advantages arise from its short er wavelength (λ=248nm)\, capability for more uniform target illumination\, and broader bandwidth than existing frequency tripled glass lasers. In add ition the focal diameter of a KrF laser can easily be zoomed down to follow an imploding target which further increases the coupling efficiency and al so helps suppress unwanted Cross Beam Energy Transfer (CBET) in the coronal plasma. Recently we have begun research on the potential of the still shor ter wavelength ArF (λ=193nm) laser for ICF. In addition\, NRL ICF researche rs are developing the means to achieve extreme bandwidths with existing ICF laser beams using Stimulated Rotational Raman Scattering (SRRS) in diatomi c gases. Large laser bandwidth (>> 1 THz) is an additional means to suppres s laser plasma instability. This presentation will provide an overview of t he scientific and technological challenges to achieving high-performance in ertial fusion with lasers and recent ICF research at NRL.\n\n*A recent revi ew paper on KrF lasers for ICF and the work at NRL is available at http://p roxy.osapublishing.org/ao/abstract.cfm?uri=ao-54-31-F103\n\nThis work is su pported by DOE-NNSA.\n\nBio: Dr. Obenschain is Head of the Laser Plasma Bra nch and leads the laser fusion program at the Naval Research Laboratory. Th e laser fusion program includes research efforts in laser-matter-interactio n experiments\, in large scale simulations of pellet implosions\, and in de velopment of high-energy krypton-fluoride (KrF) laser technology. This rese arch has been primarily funded by the Department of Energy\, National Nucle ar Security Administration. Dr. Obenschain was project manager for the desi gn and construction of Nike\, the world’s largest KrF laser facility. He wa s co-inventor with Dr. Robert Lehmberg\, of the induced spatial incoherence (ISI) technique that provides uniform illumination of targets by high-ener gy lasers. He led the first experimental efforts that showed such laser bea m-smoothing schemes can help suppress deleterious laser-plasma instability. For this work he was a recipient of the 1993 APS-DPP award for Excellence in Plasma Physics Research. He received the Fusion Power Associates Leader ship award in 2012. In selecting Dr. Obenschain\, the FPA Board recognized his many scientific and technical contributions to fusion development and t he leadership he has been providing to the U.S. and world inertial fusion e fforts\, including the leadership and vision he has been providing to plann ing for a next-step inertial fusion test facility. He is a fellow of the A merican Physical Society. He received a B.S. degree in physics from the Uni versity of Virginia and a Ph.D. in plasma physics from UCLA. \n\n\n\n\n LAST-MODIFIED:20170424T153334Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171129T160000Z DTEND:20171129T170000Z DTSTAMP:20260828T094430Z UID:4073sqab9knlqtjgu0hraqpus9@google.com CREATED:20171128T133058Z DESCRIPTION:Speaker: Professor Zhihong Nie\, Department of Chemistry and Bi ochemistry University of Maryland\, College Park\nTitle: Liquid Crystal Beh aviors of Colloidal Particles\n\nAbstract: Colloidal particles can assemble into new functional materials with diverse applications in\, such as coati ng\, photonics/phononics\, sensing\, and metamaterials. Moreover\, they can often be directly visualized under an optical microscope\, owing to their unique dimension (from hundreds of nanometers to micrometer scale). This ma kes them ideal models for studying the assembly or phase behavior of atoms and molecules that are otherwise not easy to observe directly. For instance \, spherical colloids are frequently used to understand the packing and dyn amics of atoms. To gain new insight into the interaction and assembly of mo lecules in general\, colloidal particles with nonspherical shapes (e.g.\, p latelets\, bowls\, and rods) are required\, given the geometric diversity o f organic molecules. However\, currently available colloidal analogues of o rganic molecules are largely limited to spheres\, platelets\, bowls\, or cy lindrical rods because of existing synthetic challenges. In this talk\, I w ill present our efforts on the wet-chemical synthesis of nonconventional co lloidal particles (e.g.\, banana-shaped rods\, boardlike plates\, dumbbell- like particles\, etc.) and the exploitation of their assembly into a variet y of mesophaes that are often observed in organic liquid crystal molecules (e.g.\, banana-shaped mesogens). LAST-MODIFIED:20171128T133058Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160912T203000Z DTEND:20160912T213000Z DTSTAMP:20260828T094430Z UID:bojv4k24i94rnbi4kogrudjgcs@google.com CREATED:20160908T131801Z DESCRIPTION:Speaker Name: Don Reames\n\nSpeaker Institution : IPST\, Univer sity of Maryland\, College Park\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 P M\n\nTaking the Temperature of Solar Energetic Particles\n\nAbstract : It h as been known for over 30 years that element abundances in large solar ener getic particle (SEP) events consist of two factors: 1) average abundances t hat differ from solar photospheric abundance by a factor that depends upon the first ionization potential (FIP) of the element\, and 2) event-to-event variations and time dependences that vary as a power of the mass-to-charge ratio\, A/Q\, of the elements. The FIP effect is a property of the common coronal origin of the particles\, but the A/Q dependence can be a measure o f source plasma temperature T since the pattern of ionization values\, Q\, depends upon T. In the large gradual SEP events\, particles are accelerated by shock waves driven out from the Sun by coronal mass ejections (CMEs). A s they propagate away from the shock\, scattering by magnetic fluctuations depends upon a power of A/Q so that Fe scatters less than C or O\, producin g Fe-rich abundances early and Fe-depleted regions behind. In the small imp ulsive SEP events\, A/Q-dependent enhancements occur in the regions of magn etic reconnection where they are accelerated. We find that ions in impulsiv e SEP events come from solar active regions with T= 2 – 4 MK. In the large gradual events\, 24% of events also come from T= 2 – 4 MK\, but 69% come fr om T= 0.8 – 1.6 MK typical of the ambient corona outside active regions. LAST-MODIFIED:20160909T144948Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar - Taking the Temperature of So lar Energetic Particles TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T190000Z DTEND:20161130T203000Z DTSTAMP:20260828T094430Z UID:am09093d2d21fkg9hcjt4ncarg@google.com CREATED:20161110T214606Z DESCRIPTION:Speaker: Rajan Gupta\n\nSpeaker Institution: Los Alamos Nationa l Lab\n\nTitle: The Nucleon: from charges to probing novel CP violation via neutron EDM\n \nAbstract: This talk will survey the calculations of matrix elements of quark bilinear operators between nucleon states using lattice QCD. A number of exciting physics\, at the intersection of nuclear and part icle physics\, is being probed using these calculations. The axial charge $g_A$ is a fundamental parameter encapsulating the weak interaction of nucl eons and serves to benchmark the efficacy of lattice QCD calculations of nu cleon structure. The scalar and tensor charges\, g_S and g_T\, combined wi th precision neutron decay distribution probe novel scalar and tensor inter actions at the TeV scale. Vector form factors are probed in electron scatte ring\, while axial vector form factors are used in the calculation of the c ross-section of neutrinos on nuclear targets. These energy dependent cross- sections are needed to determine the neutrino flux\, an important systemati c in neutrino oscillation experiments. Flavor diagonal charges are needed to quantify the interaction of dark matter with nuclear targets and for the nucleon sigma term. Lastly I will provide results for the matrix elements of two novel CP violating operators\, the quark EDM and the quark Chromo ED M\, that contribute to the electric dipole moment of the neutron (nEDM). LAST-MODIFIED:20161128T182952Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161005T180000Z DTEND:20161005T190000Z DTSTAMP:20260828T094430Z UID:gfc7ic0ivhvlc0a83mpbbtcf88@google.com CREATED:20160907T155742Z DESCRIPTION:Speaker Name: Parsa Bonderson \n\nSpeaker Institution: Microso ft Station Q Santa Barbara\n\nTitle: Fermionic Topological Phases and Modul ar Transformations (Part 1)\n\nAbstract: The effective theories describing bosonic topological phases of matter has been well-understood in terms of t opological quantum field theories for many years. In contrast\, the general mathematical structure of fermionic topological phases has remained unspec ified. I will detail the algebraic structure of universal properties of fer mionic topological phases\, such as quasiparticle braiding statistics and m odular transformation\, which are crucially related to the spinor structure of the physical fermions.\n\nLocation: 2205 John S. Toll Physics Building\ n\nHost: Yang-Le Wu\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20160929T175255Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar - Fermionic Topological Phases and Modular Transformat ions (Part 1) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170926T171500Z DTEND:20170926T181500Z DTSTAMP:20260828T094430Z UID:11n60i40ji1pmattd4ut7d86og@google.com CREATED:20170912T133913Z DESCRIPTION:Speaker: Dr. Thomas Purdy\, NIST\n\nTitle: Quantum and thermal noise in optomechanical systems\n\nAbstract: \nRecently there has been much experimental progress in understanding the interaction of light with solid state mechanical resonators at the quantum level in systems ranging from n ano-optomechanical systems to large-scale interferometric gravitational wav e observatories. I will begin by reviewing the basics of quantum noise lim its of optical detection of mechanical motion\, which are mostly captured b y Heisenberg's-Microscope-like uncertainty trade offs. I will highlight th e central role of correlations in quantum noise introduced by the optomech anical interactions by discussing their manifestations in recent nano/micro -optomechanics experiments: For example the spectrum of light produced whe n a mechanical resonator comes to a thermal equilibrium with the optical fo rce noise bath of the vacuum fluctuations of an optical cavity mode. I wil l discuss a recent experiment where we measure the extremely weak signature of Heisenberg measurement backaction in the form of optical quantum correl ations on light probing a nanomechanical resonator\, even while the mechani cs is strongly coupled to the ambient environment -- room temperature and a tmospheric pressure [1]. We use the scale of these quantum correlations re lative to the measured thermal motion to absolutely calibrate the resonator temperature\, demonstrating a route toward an on-chip primary thermometry referenced to fundamental constants.\n[1] T. P. Purdy\, K. E. Grutter\, K. Srinivasan\, J. M. Taylor\, Science 356\, 1265 (2017).\n\nTue\, September 2 6\, 2017 - 1:15pm\nWhere: IPST Conference Room 1116\n\n LAST-MODIFIED:20170925T150025Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170918T160000Z DTEND:20170918T180000Z DTSTAMP:20260828T094430Z UID:2g35l5qe8cjtt7hss7np4rkvc4@google.com CREATED:20170912T192947Z DESCRIPTION:Malfrid Braut-Hegghammer\nAssociate Professor of Political Scie nce\nUniversity of Oslo\n(http://www.cornellpress.cornell.edu/book/?GCOI=80 140100194670). \nHosted by The Middle East Graduate Field Committee\n&\nThe Anwar Sadat Chair for Peace and Development\nFor questions\, contact Peter Wien:\npwien@umd.edu\n\nA light lunch will be provided\nRSVP to Hagar Atti a:\nhattia@umd.edu LAST-MODIFIED:20170912T193010Z LOCATION:Taliaferro Hall\, 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Unclear Physics: Why Iraq and Libya Failed to Build Nuclear Weapons TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170330T200000Z DTEND:20170330T213000Z DTSTAMP:20260828T094430Z UID:n54ph85jceamfv2hesu1mttuko@google.com CREATED:20170324T153304Z DESCRIPTION:Speaker Name: Kevin Black\n\nSpeaker Institution : Boston Unive rsity\n\nTitle : "Search for New Physics with the Top Quark"\n\nAbstract : The top quark is the heaviest known elementary particle: with a mass as lar ge as an entire gold atom and the only fermion with a natural Yukawa coupli ng. Millions of top quarks have been produced at the LHC allowing precise m easurements of its properties that have been compared with Standard Model p redictions. The high center-of-mass energy of the LHC can also be exploited for dedicated searches for new heavy particles decaying preferentially to top quarks. I will review the latest ATLAS results searching for evidence o f new physics in the production and decay of top quarks at the LHC with the ATLAS detector. \n LAST-MODIFIED:20170330T163513Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY: High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180831T150000Z DTEND:20180831T163000Z DTSTAMP:20260828T094430Z UID:17l47rask51d471e2p0g19sk11@google.com CREATED:20180703T130453Z DESCRIPTION:Speaker: Bipasha Chakraborty\n\nSpeaker Institution: Jefferson Lab\n\nTitle: Lattice QCD calculation of the hadronic vacuum polarisation c ontribution to muon g-2\n\nAbstract: The Muon anomalous magnetic moment is one of the very few quantities in the Standard Model (SM) of particle physi cs which is both measured in experiment and calculated from theory with imp ressive accuracy of sub-parts per million (ppm). Intriguingly\, there exist s a tantalizing discrepancy of more than three standard deviations between the experimental and the SM results of this quantity providing one of the m ost stringent tests of the theory. The ongoing Fermilab experiment E989 and the upcoming experiment at J-PARC expect a four-fold improvement in the ex perimental precision (0.16 ppm expected). The theoretical uncertainty in th is quantity is dominated by the calculation of the lowest order hadronic va cuum polarisation contribution. Therefore\, I present a novel lattice QCD c alculation of this contribution which would make the discrepancy (if it rem ains) really compelling in trying to ascertain the possibility of new physi cs beyond the SM. LAST-MODIFIED:20180822T201636Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161215T190000Z DTEND:20161215T200000Z DTSTAMP:20260828T094430Z UID:2h1l2uo7ifuggigfrean6japqc@google.com CREATED:20161208T154403Z DESCRIPTION:Speaker/Institution: Sebastian Deffner\, UMBC\n\nTitle: Fast qu antum processes without excitations: shortcuts to adiabaticity\n\nAbstract: Achieving effectively adiabatic dynamics in finite time is a ubiquitous go al in virtually all areas of modern physics. So-called "shortcuts to adiaba ticity" refer to a set of methods and techniques that allow to produce in a short time the same final state that would result from an adiabatic\, infi nitely slow process. After briefly reviewing the major techniques to achiev e such shortcuts to adiabaticity\, we discuss two recent developments: (i) We generalize the "fast-forward technique" to driven Dirac dynamics. As a m ain result we find that shortcuts to adiabaticity for the (1+1)-dimensional Dirac equation are facilitated by a combination of both scalar and pseudos calar potentials. (ii) In a second part of the talk\, we focus on how to th ermodynamically quantify the cost of implementing "transitionless quantum d riving". We find that there is a trade-off between speed and cost\, i.e.\, the faster such a shortcut shall be implemented\, the higher the correspond ing thermodynamic cost.\n\nSebastian Deffner at UMBC\nTel.: +1-410-455-1972 LAST-MODIFIED:20161212T162839Z LOCATION:Rm. 401 Information Technology/ Engineering\, 1000 Hilltop Cir\, B altimore\, MD 21250\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMCP-UMBC Quantum Thermodynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170217T173000Z DTEND:20170217T190000Z DTSTAMP:20260828T094430Z UID:ltkqogaa09hv9o2lt3f9clpkvo@google.com CREATED:20170216T214105Z DESCRIPTION:Speaker: Gokce Basar\n\nSpeaker Institution: UMD\n\nTitle: Goin g with the flow: complexification of path integrals and the sign problem \n \nAbstract :In this talk\, I will explore the generalization of the Feynman path integral in quantum field theory to complexified fields. The approach is based on a deep connection between holomorphic functions and topology ( known as the Picard-Lefschetz theory) which has profound implications for q uantum field theory and string theory. After introducing the basic concepts that link Picard-Lefcshetz theory to the Feynman path integral\, I will fo cus on a set of surprising applications of this framework to the real-time dynamics of quantum field theory and studies of quantum field theory at fin ite temperature and density. This approach has a broad range of promising p otential applications ranging from high energy physics to condensed matter physics. LAST-MODIFIED:20170216T214252Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161208T203000Z DTEND:20161208T213000Z DTSTAMP:20260828T094430Z UID:1t4vd14k0amrf8p6mnennt3v04@google.com CREATED:20161205T145110Z DESCRIPTION:Speaker: Amin Gholampour (UMd)\n LAST-MODIFIED:20161205T145110Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:FJRW theory and mirror symmetry (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161206T181500Z DTEND:20161206T191500Z DTSTAMP:20260828T094430Z UID:asansn0fpkl7kai4dc57vt827k@google.com CREATED:20161129T152154Z DESCRIPTION:Speaker Name: Professor Jan Sengers\n\nSpeaker Institution : UM D\n\nTitle : "Fluctuations in Liquids on Earth and in Space" LAST-MODIFIED:20161205T145025Z LOCATION:IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180214T160000Z DTEND:20180214T170000Z DTSTAMP:20260828T094430Z UID:7bcg7h35mo8qgbmmn0kerrj1ee@google.com CREATED:20180205T152129Z DESCRIPTION:\nSpeaker: John M. Papanikolas\, Department of Chemistry\, Univ ersity of North Carolina\, Chapel Hill\, and NSF Program Director\, Chemic al Structure\, Dynamics and Mechanisms\n\nTitle: Visualizing Charge Carrier Dynamics in Nanowires with Pump-Probe Microscopy\n \nAbstract: A detailed understanding of the factors that govern the motion of mobile charge carrie rs through nanostructures is critical to many emerging nanotechnologies in electronics\, optoelectronics and solar energy conversion. While the motion of charge carriers at low carrier densities is uncorrelated and easy to un derstand\, many active electronic components operate at high carrier concen trations resulting from heavy doping or high injection. In this regime\, c arrier-carrier interactions and other many body effects (e.g. dopant/carrie r interactions\, electron screening\, and electron-hole scattering) must be considered. We have combined ultrafast pump-probe spectroscopy with optica l microscopy to directly image the charge carrier dynamics in individual Si nanowires (NWs) with both spatial and temporal resolution. In these experi ments\, an individual NW is excited by a femtosecond pump pulse that has be en focused to a diffraction limited spot by a microscope objective\, produc ing photogenerated carriers (electrons and holes) in a localized region of the structure. Motion of the photogenerated carriers is observed using a co nfiguration in which carriers are created in one location and detected in a nother. In this configuration the pump beam is held fixed and the position of the probe beam is scanned by varying the angle of the probe beam as it e nters the objective\, resulting in a spatial map of the free carriers that provides a direct visualization of carrier diffusion. LAST-MODIFIED:20180205T152129Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160414T180000Z DTEND:20160414T193000Z DTSTAMP:20260828T094430Z UID:nlau00c6pnb4nikgka0pf58iek@google.com CREATED:20160107T180001Z DESCRIPTION:Speaker Name: Sophia Economou\n\nSpeaker Institution: VA Tech\ n\nTitle: Entanglement control of superconducting qubits and photons\n\nAbs tract: Entanglement is a key resource for novel quantum technologies\, esp ecially quantum computing. Different physical systems have their own merits and challenges\, which need to be considered when creating and manipulatin g entanglement. For example\, superconducting qubits can be easily connecte d to cavities in the form of planar waveguides and to each other via these cavity modes. On the other hand\, one of their most notorious challenges is their dense spectrum (‘spectral crowding’). Photonic qubits naturally do n ot interact with each other\, and are thus long lived\, but by the same tok en it is difficult to create entanglement between them\, especially in a de terministic way. In this talk I will present our theoretical work addressin g these challenges: for superconducting qubits\, we have developed a techni que for fast entangling gates by Speeding up Waveforms by Inducing Phases t o Harmful Transitions (SWIPHT gates). For photons\, we use solid-state emit ters (quantum dots\, defect centers in solids) to create deterministically entangled photonic “cluster states”\, the necessary resource in measurement -based quantum computing. \n \n\nHOST: Chris Lobb LAST-MODIFIED:20160408T180623Z LOCATION:1201 John S Toll Physics Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Coloquium: Sophia Economou\, VA Tech TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161209T171500Z DTEND:20161209T181500Z DTSTAMP:20260828T094430Z UID:fdtqbhh88p4u4pn9f36b04tv6g@google.com CREATED:20161201T132901Z DESCRIPTION:Speaker Name: Alejandra Marcela Maldonado Trapp\n\nSpeaker Inst itution: JQI\n\nTitle: Realizing quantum advantage without entanglement in single-photon states\n\nAbstract: Quantum Discord expresses quantum correl ations beyond those associated with entanglement. Although its theory has b een extensively studied\, quantum discord has yet to become a standard tool in experimental studies of correlations. We propose an optical circuit for attaining quantum measurement advantage in a system that has no quantum entanglement. Our device produces symmetric two-qubit X -states with contr ollable anti-diagonal elements\, and does not require entangled states as i nput. We discuss the use of this device in a two-qubit quantum game. When e ntanglement is absent\, the maximum quantum advantage in this game is 1/3 b it. A slightly diminished quantum advantage\, 0.311 bit\, can be realized w ith a simplified transaction protocol.\narXiv:1604.07351\n LAST-MODIFIED:20161207T210637Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170914T123000 DTEND;TZID=America/New_York:20170914T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com RECURRENCE-ID;TZID=America/New_York:20170914T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker:\nJuan Restrepo\nUniversity of Colorado Boulder | Depar tment of Applied Mathematics\nTitle: Synchronization of Quantum Dipoles\nAb stract: In this talk we discuss the emergence of synchronization in arrays of quantum radiating dipoles coupled only via anisotropic and long-range di polar interactions. It is found that in the presence of an incoherent energ y source\, dipolar interactions can lead to a resilient synchronized steady -state. A classical mean-field description of the model results in equation s similar to the classical Kuramoto model for synchronization of phase osci llators. Using the mean-field formulation for the all-to-all coupled case\, the synchronized state can be studied\, and it is found that it exists onl y for a finite range of the external energy source rates. Results obtained from the mean-field model are compared with numerical simulations of the qu antum system and it is found that synchronization is robust to quantum fluc tuations and spatially decaying coupling. Additional nonstationary synchron ization patterns and bistability are discussed. LAST-MODIFIED:20170911T135419Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180924T110000 DTEND;TZID=America/New_York:20180924T120000 RRULE:FREQ=WEEKLY;UNTIL=20181211T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20181008T110000 EXDATE;TZID=America/New_York:20181112T110000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com CREATED:20180829T133041Z DESCRIPTION:Title: \n\nSpeaker: \n\nAbstract: LAST-MODIFIED:20180910T175653Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180912T200000Z DTEND:20180912T210000Z DTSTAMP:20260828T094430Z UID:7cnt7umquefacev6c9tfv0436c@google.com CREATED:20180910T181243Z DESCRIPTION:Title: "(Generalized) Tri-Boson Signals from a Warped Extra Dim ension"\n\nSpeaker: Kaustubh Agashe\, University of Maryland\n\nAbstract: "Simple modifications of existing extensions of the Standard Model (SM) ca n dramatically alter its signals at the LHC. We illustrate this general poi nt within the specific framework of SM fields propagating in a warped extra dimension\, which can address both the \nPlanck-weak and flavor hierarchy problems of the SM. We consider the possibility that\,\namong the SM partic les\, only the gauge bosons live in an extended region of the extra dimensi on. We show that such a scenario can suppress the usual decay channelsof th e gauge Kaluza-Klein (KK) excitations involving pairs of top quark and Higg s/W/Z gauge bosons. In turn\, this leads to the emergence ofnovel final sta tes consisting of three SM gauge bosons in a variety of combinations and fo rms. We argue that new\, dedicated searches are motivated for digging out s uch signals." LAST-MODIFIED:20180910T181420Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170502T180000Z DTEND:20170502T193000Z DTSTAMP:20260828T094430Z UID:vuft8q5t38uhoqlettmevd4d4o@google.com CREATED:20170425T162611Z DESCRIPTION:Speaker: Michael Baker\n\nSpeaker Institution: Johannes-Gutenbe rg Universität Mainz\n\nTitle: The Vev Flip-Flop: Dark Matter Decay between Weak Scale Phase Transitions\n \nAbstract: We discuss a new alternative to the Weakly Interacting Massive Particle (WIMP) paradigm for dark matter. Rather than being determined by thermal freeze-out\, the dark matter abunda nce in this scenario is set by dark matter decay\, which is allowed for a l imited amount of time just before the electroweak phase transition. We dis cuss a concrete model which exhibits a `vev flip-flop' and show that it is phenomenologically successful in the most interesting regions of its param eter space. We comment on detection prospects\, primarily at the LHC. LAST-MODIFIED:20170425T162611Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180919T150000Z DTEND:20180919T160000Z DTSTAMP:20260828T094430Z UID:6hdafgevb188fj8o8h3ffo4uhb@google.com CREATED:20180905T134051Z DESCRIPTION:Speaker: Professor Daoli Zhang\, HUST/UMD-Visiting Professor - POSTPONED

 LAST-MODIFIED:20180917T122446Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPHys Joint Seminar - POSTPONED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180516T190000Z DTEND:20180516T200000Z DTSTAMP:20260828T094430Z UID:47nf4jmneci966s5m94ou387al@google.com CREATED:20180511T140501Z DESCRIPTION:Speaker: Mr. Curt Walsh\nAffiliation: Google Lunar X-Prize Tea m Synergy Moon\n\nTitle: The New Quest for the Moon: An Informative Perspec tive on Competing in the Google Lunar X Prize\n\nAbstract:\nOn July 21\, 19 69\, the combined efforts of the United States government\, the National Ai r and Space Administration\, and a myriad of scientists\, engineers\, techn icians\, and craftsmen culminated in what would become one of the most subs tantial accomplishments in human history: a manned Moon landing. Placing tw o human beings safely on the surface of an astronomical body other than tha t of Earth marked a paradigm shift in what was humanly possible and technol ogically achievable. Humanity would return to the Moon five more times foll owing its initial lunar incursion\, each time expanding upon its knowledge and understanding of the planetary system in which it resides. However\, af ter that state-sponsored program was completed\, the majority of lunar miss ions were conducted through orbital reconnaissance. Then\, in 2007\, nearly 38 years after the first manned landing and 35 years after the last lander left the surface\, a non-profit entity known as the X Prize Foundation cre ated a competition with the primary goal of returning humanity to the lunar surface via a privately funded/ privately developed system. The competitio n’s title sponsor\, Google\, was slated to provide a significant monetary r eward to whatever team was capable of placing a viable probe on the surface of the moon and traverse it while sending back near real time\, high quali ty video. It was after this level of support and guidance was achieved that the Google Lunar X-Prize officially came into being. Throughout this prese ntation\, I will impart some of the history of the Google Lunar X-Prize as well as the objective of the competition\, a portion of the ruleset\, and t he teams that entered. I will also highlight the nature of my involvement i n the competition\, how that came to be\, and the specific efforts of team Synergy Moon. Lastly\, I will review the eventual outcome of the competitio n and post-competition developments. LAST-MODIFIED:20180511T140501Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170914T183000Z DTEND:20170914T200000Z DTSTAMP:20260828T094430Z UID:2nq948nv0ncu3e0scma3bechi7@google.com CREATED:20170831T160448Z DESCRIPTION:Speaker: Evan Berkowitz\n\nSpeaker Institution: Forschungszentr um Jülich\n\nTitle: The Nucleon Axial Coupling from QCD\n\nAbstract: The ax ial coupling g_A=1.2723(23) is one of the essential characterizations of th e nucleon and plays a fundamental role in our understanding of nuclear phys ics\, controlling nuclear beta decay and pion exchange. It has long been c onsidered a critical benchmark for lattice QCD and yet has proved substanti ally more challenging to compute than expected. I will describe our recent calculation\, g_A = 1.283(17) and explain computational strategies that\, when combined with improved algorithms and leadership-class computing\, ha ve unlocked this and other nuclear matrix elements. LAST-MODIFIED:20170906T132421Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160603T133000Z DTEND:20160603T143000Z DTSTAMP:20260828T094430Z UID:i6felan6pgssv34c6lgm82jg34@google.com CLASS:PUBLIC CREATED:20160525T153622Z DESCRIPTION:ARTIQ: the Advanced Real-Time Infrastructure for Quantum physic s\n\nSpeaker: Sébastien Bourdeauducq (M-Labs)\n\n\nARTIQ (Advanced Real-Tim e Infrastructure for Quantum physics) is a\nnext-generation control system for quantum information experiments. It\nis developed by M-Labs in partners hip with the Ion Storage Group at NIST\nas free software. The system featur es a high-level programming language\nthat helps describing complex experim ents\, which is compiled and\nexecuted on dedicated FPGA hardware with nano second timing resolution\nand sub-microsecond latency. This language can ea sily interact with\nconventional Python code that performs tasks such as da ta analysis\,\nplotting\, or controlling "slow" USB devices. ARTIQ includes graphical\nuser interfaces to parametrize and schedule experiments and to visualize\nand explore the results. LAST-MODIFIED:20160525T153622Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170428T160000Z DTEND:20170428T210000Z DTSTAMP:20260828T094430Z UID:gbuls7bpj72oei30jpu9o6v30o@google.com CREATED:20170425T131513Z DESCRIPTION:Speaker Name: Multiple Speakers\n\nSpeaker Institution : UMD an d NASA/GSFC\n\nNotes: Luncheon at Noon\; talks begin at 1 pm\n\nAbstract : https://jsi.astro.umd.edu/upcoming-mini-symposium\n LAST-MODIFIED:20170427T153306Z LOCATION:2400 CSS Building (Atlantic Building) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170908T201500Z DTEND:20170908T211500Z DTSTAMP:20260828T094430Z UID:0qdqe0225o3ip43qui7mf8cjk1@google.com CREATED:20170830T181219Z DESCRIPTION:Speaker: Efim Rozenbaum\n\nSpeaker Affiliation: JQI and CMTC\n\ nTitle: Lyapunov Exponent and Out-of-Time-Ordered Correlator's Growth Rate in a Chaotic System\n\nAbstract: It was proposed recently that the out-of-t ime-ordered four-point correlator (OTOC) may serve as a useful characterist ic of quantum-chaotic behavior\, because in the semi-classical limit\, hbar -> 0\, its rate of exponential growth resembles the classical Lyapunov exp onent. Here\, we calculate the four-point correlator\, C(t)\, for the class ical and quantum kicked rotor -- a textbook driven chaotic system -- and co mpare its growth rate at initial times with the standard definition of the classical Lyapunov exponent. Using both quantum and classical arguments\, w e show that the OTOC's growth rate and the Lyapunov exponent are in general distinct quantities\, corresponding to the logarithm of phase-space averag ed divergence rate of classical trajectories and to the phase-space average of the logarithm\, respectively. The difference appears to be more pronoun ced in the regime of low kicking strength K\, where no classical chaos exis ts globally. In this case\, the Lyapunov exponent quickly decreases as K -> 0\, while the OTOC's growth rate may decrease much slower showing higher s ensitivity to small chaotic islands in the phase space. We also show that t he quantum correlator as a function of time exhibits a clear singularity at the Ehrenfest time t_E: transitioning from a time-independent value of t^- 1 ln[C(t)] at t < t_E to its monotonous decrease with time at t>t_E. We not e that the underlying physics here is the same as in the theory of weak (dy namical) localization [Aleiner and Larkin\, Phys. Rev. B 54\, 14423 (1996)\ ; Tian\, Kamenev\, and Larkin\, Phys. Rev. Lett. 93\, 124101 (2004)] and is due to a delay in the onset of quantum interference effects\, which occur sharply at a time of the order of the Ehrenfest time.\n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20170830T181219Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170913T150000Z DTEND:20170913T160000Z DTSTAMP:20260828T094430Z UID:01ghqgfds0b5itib1rs11cactm@google.com CREATED:20170911T121116Z DESCRIPTION:Speaker: Professor Amy Mullin\, UMCP\n\nTitle: Dynamics of Mole cular Super Rotors Made in an Optical Centrifuge\n\nAbstract: Sophisticated optical techniques offer promising tools for controlling a molecule's ener gy and orientation\, which in turn can be used to understand fundamentals o f chemical behavior and reactivity. We have used an optical centrifuge to prepare molecules in very high rotational states with oriented angular mome ntum. High resolution transient IR absorption spectroscopy is used to stud y the dynamics of the super rotors. A new multipass IR detection configura tion has enabled polarization-dependent studies of the orientational anisot ropy dynamics of the high-J molecules. The mechanisms for super rotor coll isions are revealed through spatially-dependent Doppler profiles of individ ual J states. Implications for classical/quantum pictures emerge from stud ies of molecules in high quantum states.\n LAST-MODIFIED:20170911T121116Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160824T180000Z DTEND:20160824T190000Z DTSTAMP:20260828T094430Z UID:0oienkjnt2beglok5mc221ahvs@google.com CREATED:20160808T195943Z DESCRIPTION:Speaker: Hirosi Ooguri\n\nSpeaker Affiliation: Caltech\n\nTitle : What information theory teaches us on gravitational theory\n\nAbstract: P ositive energy theorems play a fundamental role in general relativity. Rece ntly\, we found a new class of positive energy theorems using information i nequalities such as the positivity and monotonicity of the relative entropy .\nThis and related applications of information theory are providing us new insights into gravitational theory.\n LAST-MODIFIED:20160815T132706Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171130T123000 DTEND;TZID=America/New_York:20171130T133000 DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h_R20171109T173000@google.com RECURRENCE-ID;TZID=America/New_York:20171130T123000 CREATED:20170830T181615Z DESCRIPTION:Speaker: Yannis Kevrekidis\nJohns Hopkins University | Departme nt Chemical and Biomolecular Engineering / Department of Applied Mathematic s and Statistics\n\nTitle: No Equations\, No Variables\, No Parameters\, No Space\, No Time: Data and the Modeling of Complex Systems\nAbstract: Obtai ning predictive dynamical equations from data lies at the heart of science and engineering modeling\, and is the linchpin of our technology. In mathem atical modeling one typically progresses from observations of the world (an d some serious thinking!) first to equations for a model\, and then to the analysis of the model to make predictions.\nGood mathematical models give g ood predictions (and inaccurate ones do not) - but the computational tools for analyzing them are the same: algorithms that are typically based on clo sed form equations. While the skeleton of the process remains the same\, to day we witness the development of mathematical techniques that operate dire ctly on observations -data-\, and appear to circumvent the serious thinking that goes into selecting variables and parameters and deriving accurate eq uations. The process then may appear to the user a little like making predi ctions by "looking in a crystal ball". Yet the "serious thinking" is still there and uses the same -and some new- mathematics: it goes into building a lgorithms that "jump directly" from data to the analysis of the model (whic h is now not available in closed form) so as to make predictions. Our work here presents a couple of efforts that illustrate this ``new” path from dat a to predictions. It really is the same old path\, but it is travelled by n ew means. LAST-MODIFIED:20171120T153042Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170918T160000 DTEND;TZID=America/New_York:20170918T170000 RRULE:FREQ=WEEKLY;COUNT=5;BYDAY=MO DTSTAMP:20260828T094430Z UID:7lt08t63akq1aj04pdbnqlaibo@google.com CREATED:20170906T191250Z DESCRIPTION:snejjar@umd.edu LAST-MODIFIED:20170906T191342Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180209T210000Z DTEND:20180209T220000Z DTSTAMP:20260828T094430Z UID:603b9u2729ve8phu77igl3bms1@google.com CREATED:20180201T143405Z DESCRIPTION:Speaker: Jonathan Curtis

Affiliations: JQI and CMTC
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Title: \;Near the Horizon of a Sonic Black-Hole


There will be snacks and drinks at \;4:00 \;a nd the talk is from \;4:10 to 4:40 \;in PSC 2136.  \;
 \;

Abstract: \;When the quantum behavior of matter is accounted for\, black-holes become thermal black-bod ies rather than the perfect absorbers they are classically envisioned to be . This emission of thermal radiation eventually causes the black-hole to ev aporate away [1].


A n analogous process happens in fluids which flow faster than the local spee d of sound. For classical fluids\, transport processes can only flow downst ream once the sonic event-horizon is passed. In quantum fluids (e.g. a BEC) a supersonic flow is generally accompanied by the thermal emission of phon ons\, a process analogous to Hawking radiation. This analogy can be made mo re rigorous\, where it is shown that for a slowly varying condensate a flux of thermally populated phonons appears once the speed of sound is crossed [2].

We study the extre me limit of this system where the fluid is made to drastically jump from a subsonic flow to a supersonic flow. This “step-like” problem can be formula ted in terms of a one-dimensional wave-equation which describes the rate at which Hawking particles are emitted. We find that\, in contrast to the far -field behavior which looks universally thermal\, the near-horizon field ha s significant departures from the thermal description. This departure can b e understood as arising from quantum interference between outgoing phonons and trapped phonons partially tunneling out of the black-hole. We briefly d iscuss how this process fits into the existing understanding of the “black- hole information paradox.”

J.B. Curtis\, G. Refael\, V. Galitski\, “Evanescent Horizon Modes Partne red to Acoustic Hawking Emission\,” (2018) arXiv:1801.01607

[1] S.W. Hawking\, “Black hole explosi ons?” Nature 248 30 (1974)  \;
[2] W.G. Unruh\ , “Experimental Black-Hole Evaporation?” Phys. Rev. Lett. 46 21 (1981)  \; \; LAST-MODIFIED:20180201T144636Z LOCATION:2136 Physical Sciences Complex SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170906T150000Z DTEND:20170906T160000Z DTSTAMP:20260828T094430Z UID:2fc3skv5t5qo5nce0j18auo56g@google.com CREATED:20170829T175300Z DESCRIPTION:Speaker: Pratyush Tiwary\, University of Maryland\, College Par k\n\nTitle: Reaction coordinate in chemistry: fool's gold\, or an actionabl e concept? \n\nAbstract: The reaction coordinate (RC) is an ubiquitous conc ept across chemistry\, found in the introductory chapters of arguably all p hysical chemistry textbooks. The usefulness of many widely used theories an d methods - transition state theory and umbrella sampling to name a couple - is contingent upon knowing the RC. In principle the RC is a low-dimension al descriptor that best captures the movement of a given high-dimensional s ystem from one metastable state to another. But most real world systems do not have just two states\, and are characterized by multiple spatiotemporal scales and numerous intertwined degrees of freedom. Identifying what the R C is for these systems becomes a very hard problem. Furthermore\, the RC ca n also dynamically alter depending on the nature and extent of coupling wit h the solvent or the environment. In this talk\, I will first re-examine th e notion of what an RC actually is. I will then describe some new methods f or finding the RC in complex molecular systems characterized by rare events . Finally\, I will show some applications of these methods with a special f ocus on the structural dynamics of drug unbinding using fully atomistic sim ulations of biotin-streptavidin and protein kinases relevant to cancer. LAST-MODIFIED:20170829T175758Z LOCATION:0112 Chemistry (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Physical Chemistry / Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180427T200000Z DTEND:20180427T210000Z DTSTAMP:20260828T094430Z UID:7kfqscgr0gq7kkmo6tljptts0m@google.com CREATED:20180419T181041Z DESCRIPTION:Speaker: Simon Olsson\, Free University of Berlin

Title: Models of Protein Molecular Kinetics from Simulation and Experiment

Abstract: \;Conformational change plays a critical role i n protein function. The mapping out of these conformational states and thei r mutual exchange rates therefore constitutes an important problem in moder n biophysics. Integrated analysis of multiple off-equilibrium molecular dyn amics simulations via probabilistic and machine learning techniques in prin ciple allow us to achieve this goal. However\, these approaches will intrin sically be limited by the accuracy of the employed simulation model.
In this talk I will discuss ways we can validate kinetic models using a ccurate biophysical data [1] and and how we can overcome inaccuracies in ca ses where agreement with experimental data is not satisfactory [2].

[1] Olsson &\; Noé “Mechanistic models of chemical exchange induced rela xation in protein NMR” JACS 2017
[2] Olsson et al. “Combining experiment al and simulation data of molecular processes via
augmented Markov model s” PNAS 2017 LAST-MODIFIED:20180425T191734Z LOCATION:3219 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar Announcement TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180201T123000 DTEND;TZID=America/New_York:20180201T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180201T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: James Yorke\nUMD Department of Mathematics\nTitle: Rev iewing Artificial Intelligence and the book Life 3.0\nAbstract: TBA LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160921T200000Z DTEND:20160921T210000Z DTSTAMP:20260828T094430Z UID:0964io07qjjb1pbdgkoo59vul0@google.com CREATED:20160912T190548Z DESCRIPTION:Speaker Name: Prof. Allen Boozer\n\nSpeaker Institution : Colum bia University\n\nTitle: Relativistic Electrons and Magnetic Reconnection in ITER\n \nAbstract : ITER\, the largest scientific project ever undertake n\, “has been designed to prove the feasibility of fusion” energy. That mis sion could be compromised if the net current in the plasma were transferred to relativistic-electron carriers\, which can result in great damage to th e device. More than a hundred-fifty papers on the topic have appeared in th e twenty years since it was realized that a sudden drop in the plasma tempe rature could cause such a transfer. The theoretical papers have focused on electron runaway when magnetic field lines remain confined to the plasma vo lume. Experiments and their simulation imply most magnetic field lines inte rcept the walls when a sudden drop in the temperature occurs. In simulation s not all of the magnetic field lines intercept the walls. If these non-int ercepting flux tubes survive until outer magnetic surfaces reform\, an espe cially dangerous situation arises in which the relativistic electrons can b e lost in a short pulse along a narrow flux tube.\n\nMaxwell’s equations im ply the conservation of magnetic helicity during fast magnetic reconnection s. Helicity conservation clarifies features\, such as the spike in the plas ma current during a thermal quench\, and shows that a rapid\, ~1ms\, accele ration of electrons can occur. Magnetic reconnection can occur on a time sc ale of tens of Alfvén transit times either due to the formation of multiple plasmoids or as a result of the exponential sensitivity to non-ideal effec ts when an ideal evolution causes neighboring magnetic field lines to incre ase their separation exponentially with distance along the lines. In either case\, magnetic flux tubes that had different force-free parallel currents J_||/B and different poloidal magnetic fluxes external to their surfaces c an be joined in a fast reconnection. The differing parallel currents relax by Alfvén waves\, and the change in the poloidal flux associated with a giv en enclosed toroidal magnetic flux is given by helicity conservation. Based on the observed time scale of current spikes\, a few hundred toroidal tran sits are required to relax the J_||/B profile\, which is consistent with di stance along magnetic field lines implied by the speed of the electron temp erature drop. Helicity conservation implies that although changes in the po loidal flux can occur on a time scale determined by the Alfvén transit time \, the magnetic helicity and most of the poloidal flux can change only on a long resistive\, L/R\, time scale. Rapid plasma terminations require plasm a cooling.\n\nThe potential for damage\, the magnitude of the extrapolation from existing devices\, and the importance of the atypical—incidents that occur once in a thousand shots—make theory and simulation essential for ens uring that relativistic runaway electrons will not prevent ITER from achiev ing its mission. The U.S. DoE Office of Science has established a Simulatio n Center for Runaway Electron Avoidance and Mitigation (SCREAM) with a two- year funding of 3.9M$. The danger of runaway of electrons to relativistic e nergies can be avoided in magnetically confined fusion systems by making th e net current the J_||/B sufficiently small. This is possible in the non- a xisymmetric stellarator geometry though not in axisymmetric tokamaks\, such as ITER. LAST-MODIFIED:20160912T191911Z LOCATION:ERF 1207 Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170608T150000Z DTEND:20170608T160000Z DTSTAMP:20260828T094430Z UID:ff3s3rbmb3t3r3bl8lm6guin88@google.com CREATED:20170606T135338Z DESCRIPTION:Go scramble yourself! Out-of-time-ordered correlators\, fluctua tion relations\, and quasiprobabilities\n\nNicole Yunger Halpern (Institute for Quantum Information and Matter\, Caltech)\n\nThe out-of-time-ordered c orrelator (OTOC) reflects the scrambling of quantum information in many-bod y systems. The OTOC encodes time reversals and thermalization. So do fluctu ation relations and quasiprobabilities. Fluctuation relations are equalitie s derived in nonequilibrium statistical mechanics. Quasiprobabilities are q uantum generalizations of probabilities. I will unite these three concepts in a fluctuation-type relation\, casting the OTOC as a moment of a summed q uasiprobability. That quasiprobability—and so the OTOC—can be inferred from weak measurements. The weak-measurement scheme is expected to be implement able with superconducting qubits\, cold atoms\, ion traps\, cavity QED\, an d perhaps NMR. This work offers conceptual and experimental insights into q uantum-information scrambling\, fluctuation relations\, and quasiprobabilit ies.\n\nReferences\n(1) NYH\, Phys. Rev. A 95\, 012120 (2017).\n(2) NYH\, B . Swingle\, and J. Dressel\, arXiv:1704.01971 (2017).\n\n LAST-MODIFIED:20170606T135339Z LOCATION:Atlantic Building\, Room 4301 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Go scramble yourself! Out-of-time-ordered correlators\, fluctuation relations\, and quasiprobablities TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171128T160000 DTEND;TZID=America/New_York:20171128T170000 DTSTAMP:20260828T094430Z UID:19ik9djbiboiuqc2dg02lvv26r@google.com RECURRENCE-ID;TZID=America/New_York:20171128T160000 CREATED:20170809T181538Z DESCRIPTION:Speaker Name: Joe Taylor\n\nSpeaker Institution: Princeton Uni versity\n\nTitle: From Einstein's Theory to Gravity's Chirp\n\nAbstract: Pu blished in 1915\, Albert Einstein's theory of General Relativity appeared t o imply the existence of gravitational waves\, an entirely new form of ener gy and radiation. However\, physical reality of these implied waves was do ubted by many\, including Einstein himself\, for well over half a century.\ n\nThe 1974 discovery of binary pulsar PSR B1913+16 led to the dedicated de velopment of much more accurate pulsar timing instrumentation and technique s. Early results from this work motivated further theoretical work to clea r up quantitative questions about gravitational waves in GR. By the late 1 980s\, measured orbital dynamics of the binary pulsar were shown to be in q uantitative agreement with GR\, including energy losses via gravitational r adiation. This experimental proof was surely a prerequisite for the 1992 f unding of LIGO\, the Laser Interferometer Gravitational-Wave Observatory. After nearly another quarter century\, in 2015 LIGO achieved its first spec tacular successes.\n LAST-MODIFIED:20171205T204032Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161020T163000Z DTEND:20161020T173000Z DTSTAMP:20260828T094430Z UID:bj8s8lmuuurqfqg9dok9170ai8@google.com CREATED:20160825T181501Z DESCRIPTION:Speaker Name: Joe Hart and Rajarshi Roy\n\nSpeaker Institution : University of Maryland College Park\n\nTitle: Chaos\, Noise and Random Numbers LAST-MODIFIED:20160826T134813Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - Chaos\, Noise and Random Numbers TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171017T150000Z DTEND:20171017T161500Z DTSTAMP:20260828T094430Z UID:7kd2pv2vo2bsie3aa08345frp5@google.com CREATED:20170727T195155Z DESCRIPTION:Speaker: Oskar Vafek (Florida State University)\n\nTitle: Hunds interaction\, spin-orbit coupling and the mechanism of superconductivity i n heavily hole-doped iron pnictides\n\nAbstract: Argument will be made for a novel unconventional mechanism for s-wave (A1g) Cooper pairing in heavily hole doped iron pnictides. This mechanism avoids large on-site intra-orbit al repulsion\, and is favored when the renormalized Hunds interaction excee ds the renormalized onsite inter-orbital Couplomb repulsion. In the absence of spin-orbit interaction\, the Cooper pairing has A2g spin triplet charac ter\, but with spin-orbit included\, the gap transforms as A1g. This is not just a change in bookkeeping. Rather\, it results in a qualitative differe nce in the nature of the pairing instability\, and in the temperature depen dence of the Knight shift. The resulting gap has most of the features of th e structure and gap anisotropy observed in laser angle resolved photoemissi on\, including the possibility of accidental nodes. It explains why\, when such nodes are observed\, they appear only on the outer (Eg) Fermi surface\ , as well as why the overall gap magnitude is smaller there than on the inn er (Eg) Fermi surface.\n\nReferences:\nO. Vafek and A.V. Chubukov\, Phys. R ev. Lett. 118\, 087003 (2017)\nV. Cvetkovic and O. Vafek\, Phys. Rev. B 88\ , 134510 (2013)\n\nHost: Robert Throckmorton\n\nhttp://www.physics.umd.edu/ cmtc/seminars.html\n\nWhen: Tues\, Oct. 17 @ 11:00am\nWhere: CMTC Conferen ce Room (2205 Toll Physics Bldg.)\n LAST-MODIFIED:20171006T153939Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160505T123000 DTEND;TZID=America/New_York:20160505T133000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8_R20160421T163000@google.com RECURRENCE-ID;TZID=America/New_York:20160505T123000 CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Dietmar Plenz\n\nSpeaker Institution: NIH\, Nati onal Institute of Mental Health\n\nTitle: Irregular spiking of pyramidal ne urons organizes as scale-invariant neuronal avalanches in the awake state\n \n LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161005T190000Z DTEND:20161005T200000Z DTSTAMP:20260828T094430Z UID:rr64jgnh5llboncrtq7b3m9mfg@google.com CREATED:20160930T165714Z DESCRIPTION:Speaker Name: Dr. Edward P. Vicenzi\n\nSpeaker Institution : Sm ithsonian Institution’s Museum Conservation Institute\n\nTitle : Rock varni sh on architectural stone: microscopy and analysis of nanoscale manganese o xide deposits on the Smithsonian Castle\, Washington\, DC\n\nAbstract : The Smithsonian Institution Building\, more commonly referred to as the Castle \, is situated on the National Mall in Washington\, DC. When construction w as completed in 1855 it housed chemical laboratories\, exhibit halls\, spec imen storage\, and all other institution functions\, as well as the residen ce and office for physicist Joseph Henry\, the first Secretary of the insti tution. Irregular black\, or blue-black patches began appearing in the late 20th century and were recently linked to high Mn concentration on the surf ace of the building's red sandstone. An examination of the microscopy and a nalysis of this intriguing varnish has recently been conducted. The study r eveals that the mineralogy and composition of the incomplete and thin coati ng gives a glimpse of the earliest stage of development of desert varnish f ormed over much longer periods of time on natural rock surfaces. Such varni shes are important for paleoclimate studies\, as well as archaeologically\, since symbols and designs have been carved into the coatings for millennia .\n LAST-MODIFIED:20160930T170737Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161013T163000Z DTEND:20161013T173000Z DTSTAMP:20260828T094430Z UID:4ngpolkuonf09j4qsvks5p2338@google.com CREATED:20160825T181258Z DESCRIPTION:Speaker Name: Balakumar Balachandran\n\nSpeaker Institution: U MD Department of Engineering\n\nTitle: Noise-Influenced Dynamics\n\n\n LAST-MODIFIED:20161006T152633Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - Noise-Influenced Dynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160920T171500Z DTEND:20160920T181500Z DTSTAMP:20260828T094430Z UID:80c2qp7ngu984qd84ethf7f5fg@google.com CREATED:20160912T174009Z DESCRIPTION:Speaker Name: Dr. Oren Raz\n\nSpeaker Institution : UMD\n\nTitl e : Mimicking Nonequilibrium Steady States in Time-Periodic Driving\n\nAbst ract : Under static conditions\, a system satisfying detailed balance gener ically relaxes to an equilibrium state in which there are no currents. To g enerate persistent currents\, either detailed balance must be broken or the system must be driven in a time-dependent manner. In both cases\, the curr ents are maintained at the cost of entropy production. Are these two paradi gmatic scenarios effectively equivalent? In this talk\, I will present a ma pping between nonequilibrium stationary states and stochastic pumps. Nonequ ilibrium steady states and periodic-driving are often used to model\, respe ctively\, biomolecular motors driven by chemical reactions and artificial m olecular machines steered by the variation of external\, macroscopic parame ters. Our results suggest that anything a biomolecular machine can do\, an artificial molecular machine can do equally well. This principle are illust rated by showing that kinetic proofreading\, a NESS mechanism that explains the low error rates in biochemical reactions\, can be effectively mimicked by a constrained periodic driving. LAST-MODIFIED:20160912T174123Z LOCATION:IPST Bldg. Rm. 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180514T200000Z DTEND:20180514T213000Z DTSTAMP:20260828T094430Z UID:3oljr4jiv97ef9vam5n9b5kfun@google.com CREATED:20180423T171135Z DESCRIPTION:\nSpeaker: Can Kilic\n\nSpeaker Institution: University of Texa s\n\nTitle: A Secret Asymmetry From Flavored Dark Matter\n\nAbstract: In th eories where dark matter has multiple flavors and where its coupling to Sta ndard Model particles is flavor-non-trivial\, I will explore a novel mechan ism for generating an asymmetry in the dark sector despite an unbroken glob al dark matter number symmetry. Focusing on two benchmark models incorporat ing this mechanism\, I will consider how standard experimental signatures a re affected in novel ways\, such as collider searches\, direct and indirect detection experiments\, and I will also explore the consequences for astro physical observables. LAST-MODIFIED:20180514T130902Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Moved to Tuesday** EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170807T173000Z DTEND:20170807T190000Z DTSTAMP:20260828T094430Z UID:47g8ts5br8ph5m1b8ncp2ekc18@google.com CREATED:20170612T140848Z DESCRIPTION:**Please note start time**\n\nSpeaker: Arindam Das\n\nSpeaker I nstitution: Korea Institute for Advanced Study\n\nTitle: Phenomenology of t he right handed heavy neutrinos at the high energy colliders\n \nAbstract: The current experimental results of the neutrino oscillation phenomena have established the existence of the neutrino mass and f lavor mixing\, which require us to extend the Standard Model (SM). There are two simple extensio ns of the SM which can naturally explain such phenomena. One of them is cal led the seesaw mechanism which includes SM-singlet heavy right-handed Major ana neutrinos induce the dimension five operators leading to very small lig ht Majorana neutrino masses. There is another kind of seesaw mechanism\, co mmonly known as the inverse seesaw\, where the tiny Majorana mass is genera ted from the small lepton number violating parameters\, rather than being s uppressed by the heavy n eutrino mass in the conventional seesaw mechanism. Such mechanisms can be tested at the high energy colliders through differe nt interactions. In this talk\, we will discuss the models of generating th e neutrino mass and the possible tests at the high energy colliders. LAST-MODIFIED:20170731T140553Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170315T150000Z DTEND:20170315T160000Z DTSTAMP:20260828T094430Z UID:585qm9rr9rts3gu5qhagtgnvgs@google.com CREATED:20170310T133935Z DESCRIPTION:Speaker: Zhengfeng Ji\n\nSpeaker Affiliation: UT Sydney\n\nTitl e: Quantum-Proofs.zip\n\nAbstract: In this talk\, I will unzip a recent pro gress on quantum interactive proofs---communications in quantum multi-prove r interactive proofs can be exponentially compressed. By combining several old good ideas in quantum proofs\, we will show how to construct a protocol that transforms any quantum multi-prover interactive proof system into a n onlocal game\, a scaled-down version the proof system in which questions co nsist of a logarithmic number of bits and answers of a constant number of b its. As a corollary\, this proves that nonlocal games are complete for QMIP *\, and therefore NEXP-hard. This establishes that nonlocal games are prova bly harder than classical games. Our result reveals an important difference between classical and quantum multi-prover proofs\, and makes interesting implications for the multi-prover variant of the quantum PCP conjecture. LAST-MODIFIED:20170310T133945Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181024T150000Z DTEND:20181024T160000Z DTSTAMP:20260828T094430Z UID:3vchjdep422etvtf967ui5jpse@google.com CREATED:20180905T135117Z DESCRIPTION:Speaker: Chiyu Zhang\, Graduate Student Literature Seminar\, UMCP

Title: TBA LAST-MODIFIED:20180905T135247Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys.ANE.ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180419T200000Z DTEND:20180419T213000Z DTSTAMP:20260828T094430Z UID:7n010i41o9keuh32a9mfo68ogn@google.com CREATED:20180326T135330Z DESCRIPTION:\nSpeaker: Andy Lucas\n\nSpeaker Institution: Stanford Universi ty\n\nTitle: Fast scrambling on sparse graphs\n\nAbstract: The fast scram bling conjecture is that quantum many-body systems with few-body interacti ons can scramble information among N degrees of freedom in a time that grow s no slower than log(N). I will review this conjecture and some simple c artoons which justify it. By studying 2-local Hamiltonians with general co nnectivity graphs\, I will then clarify why arbitrarily fast information sc rambling is generally impossible. Using a mix of formal perspectives and simple models of chaotic quantum dynamics including random unitary circuit s and generalized Sachdev-Ye-Kitaev models\, I will describe both the sprea d of entanglement between initially unentangled subsystems and the growth o f (out-of-time-ordered) correlation functions. On many graphs\, I will pr ove the fast scrambling conjecture for 2-local Hamiltonians and give a simp le graph-theoretic diagnostic for determining whether a given graph can hos t a fast scrambler. I will propose new ways to look for fast scramblers i n cold atom experiments. LAST-MODIFIED:20180328T222116Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint CMTC/MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160928T190000Z DTEND:20160928T200000Z DTSTAMP:20260828T094430Z UID:stbosbj7vedsl1a60mndk4uvpg@google.com CREATED:20160915T194019Z DESCRIPTION:Speaker Name: Dr. Tom Spence\n\nSpeaker Institution : Northrop Grumman Mission Systems\, Baltimore\n\nTitle: Increasing the Affordability of Phased Array Apertures with Additive Manufacturing\n\nAbstract : Active Electronically Scanned Arrays (AESAs) provide unprecedented agile\, multi- function capabilities for radar\, communications\, and EW systems. The radi ating aperture is a critical component of every AESA antenna system and the latest trends call for designs that support a wide bandwidth\, wide field of view\, and polarization diversity. The tapered slot (or Vivaldi) antenna is one of the well-known\, “go to” elements for these demanding requiremen ts. Arrays covering multi-octave bandwidths and large scan volumes have bee n reported and demonstrated. Their construction is traditionally based on p rinted circuit board (PCB) and/or metal machining technology\, and a single array may be comprised of dozens or hundreds of individual components. \n\ nThis talk will describe a new realization of the tapered slot antenna\, ca lled the Broadband Additively Manufactured Array Antenna (BAMAA). It exhibi ts comparable performance to a traditional tapered slot array (TSA) while o ffering a significant simplification in construction. Its novel architectur e\, which enables a simple one-piece design\, must be fabricated using addi tive manufacturing (AM). The use of AM in the fabrication of BAMAA also pro vides the benefits of a dramatic reduction in cost\, fabrication time\, and touch labor versus traditional PCB or machined metal TSA designs. Addition ally\, the nature of its structure opens the design trade space for a high level of integration with system platforms. The focus of this talk will be placed on presenting details of the architecture\, prototype testing\, manu facturability\, and applications. LAST-MODIFIED:20160915T195516Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar - Increasing the Affordability of Phased Array Aperture s with Additive Manufacturing TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171012T180000Z DTEND:20171012T193000Z DTSTAMP:20260828T094430Z UID:3jpv5ev8lbhmt91j8mul7pfqb7@google.com CREATED:20170908T200343Z DESCRIPTION:Speaker: Dr. Liang Wu\, Univ. of PA\n\nTitle: Quantized electro -dynamical responses in topological materials\n\nAbstract: Although solid-s tate systems are usually considered “dirty” with impurities and imperfectio ns\, it is still the case that macroscopic\, quantized phenomena can be obs erved in the form of the Josephson effect in superconductors and the quantu m Hall effect in 2D electron gas. Combinations of these measurements allow you to determine Planck’s constant and the fundamental charge in a solid-s tate setting. In my talk\, I will show you the observation of a new quantiz ed response in units of the fine structure constant in a new class of mater ial so called “topological insulators” (TIs). First\, I will introduce what are TIs and discuss how we can probe the low-energy electrodynamics of the Dirac surface states in 3D TI thin films using time-domain THz spectroscop y. I will then discuss our work following the evolution of the response as a function of magnetic field from a semi-classical transport regime to a qu antum regime. In the latter case\, although DC transport is still semi-cla ssical\, we find evidence for Faraday and Kerr rotation angles quantized in units of the fine structure constant. This shows that these materials may be regarded as unique magnetoelectrics with a quantized response and is co nsistent with the long-sought “axion electrodynamics” of 3D TIs. Among othe r aspects this give a purely solid-state measure of the fine structure cons tant based on a topological invariant. Finally\, I will briefly talk about future directions of studies on quantized responses in other topological ma terials.\n\nReference: Wu\, et al. Science 354\, 1124 (2016)\n\nHOST: Rick Greene LAST-MODIFIED:20170927T165044Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Dr. Liang Wu\, Univ. of PA TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180313T160000 DTEND;TZID=America/New_York:20180313T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180313T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Robert Boyd

Speaker Institution: Universit y of Ottawa\, Ottawa\, ON Canada &\; Institute of Optics and Department of Physics and Astronomy University of Rochester\, Rochester NY USA

 \;

Title:&n bsp\; \;What’s New in Nonlinear Optics

Abstract:&nb sp\; \;This talk begins with a brief overview of the history of n onlinear optics and a description of some standard nonlinear optical effect s. \; I will then turn to a more detailed discussion of two topics of c urrent interest. \; The first topic is the role played by nonlinearity in the creation of rogue waves\, including oceanic rogue waves. \; We h ave performed careful studies of optical wave propagation through nonlinear materials to elucidate the role of nonlinearity in the development of extr eme (rogue) events. \; The second topic is an overview of wave propagat ion effects through materials characterized by a very small value of the di electric permittivity\, that is\, through epsilon-near-zero (ENZ) materials . \; We describe some of the unusual properties of wave propagation thr ough such materials including the huge nonlinearities that necessarily acco mpany ENZ conditions.

Hosted by Howard Milchberg LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Robert Boyd TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170316T163000Z DTEND:20170316T173000Z DTSTAMP:20260828T094430Z UID:mn62j3o8kp94im6khhoh0knt9g@google.com CREATED:20170221T180448Z DESCRIPTION:Speaker Name: Elaine Oran\n\nSpeaker Institution: University o f Maryland\, College Park | Department of Physics\n\nTitle : Flames\, Fire Whirls\, and Blue Whirls: What more can there be?\n \nAbstract: As we were investigating the efficiency of fire-whirl burning on water\, we observed t he usual transformation of a pool fire to a fire whirl\, and then suddenly\ , we saw the fire undergo a third transition. A blue cup appeared around th e base of the fire whirl\, surrounding the yellow flame\, the yellow flame receded into the cup and finally disappeared. What remained was a small\, r apidly spinning blue flame that burned until the fuel on the water was cons umed. The blue whirl was shaped like a spinning cup\, closed at the bottom near the water surface\, and spreading in radius moving upwards towards the rim. Above the blue cup lip\, there was a purple cone-shaped mist. The fue l initially used was n-heptane\, but now it has been varied and includes cr ude oil\, and still the blue whirl formed naturally. The height of the fire whirl on the laboratory pan was larger than a half meter\, and this evolve d into a blue whirl about 4–8 cm high. Occasionally the blue whirl would be come “unstable” and revert to a transitional state of blue cup holding a ye llow flame. When the blue whirl formed\, turbulence seemed to disappear\, a nd the flame became quiet. Videos of the experiments are used to show how t his happened and discuss the evolution of the fire whirl to the blue whirl in vortex-breakdown concepts. LAST-MODIFIED:20170224T142626Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180412T123000 DTEND;TZID=America/New_York:20180412T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180412T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Sarthak Chandra\nUniversity of Maryland Physics and IR EAP\nTitle: Macroscopic Behavior of Systems of Many Interacting Orientable units: The Strong Influence of Dimensionality on the Dynamics\nAbstract: Th e Kuramoto model\, originally motivated by the dynamics of many interacting oscillators\, has been used and generalized for a wide range of applicatio ns involving the collective behavior of large heterogenous groups of dynami cal units whose states are characterized by a scalar angle variable. One su ch application in which we are interested is the alignment of velocity vect ors among members of a swarm. Despite being commonly used for this purpose\ , the Kuramoto model can only describe swarms in 2 dimensions\, and hence t he results obtained do not apply to the often relevant situation of swarms in 3 dimensions. Partly based on this motivation\, we study the Kuramoto mo del generalized to D dimensions\, focusing on the 3-dimensional case. We sh ow that in 3 dimensions\, as well as for all odd dimensionality\, the gener alized Kuramoto model for heterogenous units has dynamics that are remarkab ly different from the dynamics in 2 dimensions. In particular\, for odd D t he transition of the time asymptotic equilibrium state to coherence occurs discontinuously as the coupling constant K is increased through zero\, as o pposed to the D=2 case (and\, as we will show\, also the case of even D) fo r which the transition to coherence occurs as K increases through a postiti ve critical value Kc. We observe that the odd-dimensional Kuramoto models w ith a large number of swarm elements is not low dimensional in the sense of Ott & Antonsen (2008). However\, application of our generalized form of th e Ott-Antonsen ansatz does reduce the complexity of the problem when compar ed with the full system of equations. We generalize our results beyond the Kuramoto model to a wider class of swarm dynamics in high dimensions\, and we show that the Ott-Antonsen ansatz can be appropriately generalized for t his class of systems. We expect that our results will hence be useful for s olving questions involving coupled systems on a sphere in high dimensions\, beyond just the Kuramoto model. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171020T201500Z DTEND:20171020T211500Z DTSTAMP:20260828T094430Z UID:720m6k566sfchafkn8f9sqvant@google.com CREATED:20171012T163558Z DESCRIPTION:Speaker: Jeremy Young\n\nAffiliation: JQI\n\nTitle: Dissipation induced dipole blockade and anti-blockade in driven Rydberg systems\n\nAbs tract: We study the competing blockade and anti-blockade effects induced by spontaneously generated contaminant Rydberg atoms in driven Rydberg system s. These contaminant atoms provide a source of strong dipole-dipole interac tions and play a crucial role in the system's behavior. We study this probl em theoretically using two different approaches. The first is a cumulant ex pansion approximation\, in which we ignore third-order and higher connected correlations. Using this approach for the case of resonant drive\, a many- body blockade radius picture arises\, and we find qualitative agreement wit h experiment. The second theoretical approach is a set of phenomenological inhomogeneous rate equations. We compare the results of our rate equation m odel to the experimental observations in [E. A. Goldschmidt\, et al.\, PRL 116\, 113001 (2016)] and find that these rate equations provide quantitativ ely good scaling behavior of the steady-state Rydberg population for both r esonant and off-resonant drive.\n\n*Snacks and drinks will be served at 4 p m* LAST-MODIFIED:20171012T163558Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161012T150000Z DTEND:20161012T160000Z DTSTAMP:20260828T094430Z UID:vdmch8o3ib5umfhtaru0aj018s@google.com CREATED:20161004T153620Z DESCRIPTION:Speaker: Fang Song\n\nSpeaker Affiliation: Portland State Unive rsity\n\nTitle: Zero-knowledge proof systems for QMA\n\nAbstract: Zero-know ledge (ZK) proof systems are fundamental in modern cryptography. Prior work has established that all problems in NP admit classical zero-knowledge pro of systems\, and under reasonable hardness assumptions for quantum computat ions\, these proof systems can be made secure against quantum attacks.\n\nI n this talk\, I will present our recent work that further generalizes these results in a quantum setting. We show that every problem in QMA admits a z ero-knowledge proof system under a mild intractable assumption. Our QMA pro of system is sound against arbitrary quantum provers\, but only requires an honest prover to perform polynomial-time quantum computations\, provided t hat it holds a quantum witness for a given instance of the QMA problem unde r consideration. I'll describe the main tools we develop to build the ZK pr oof systems: 1) a new variant of the QMA-complete local Hamiltonian problem in which the local terms are described by Clifford operations and standard basis measurements\; and 2) a new quantum encoding scheme that provides au thentication and transversal Clifford operations. \n\nJoint work with Anne Broadbent\, Zhengfeng Ji\, and John Watrous. https://arxiv.org/abs/1604.028 04\n LAST-MODIFIED:20161004T184547Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161130T200000Z DTEND:20161130T210000Z DTSTAMP:20260828T094430Z UID:09c7nhi5gfoufd19nvuqbpppvo@google.com CREATED:20161128T142754Z DESCRIPTION:Speaker Name: Dr. David A Markowitz\n\nSpeaker Institution : In telligence Advanced Research Projects Activity (IARPA)\n\nTitle : The IARPA MICrONS Program\n \nAbstract : Despite significant progress in machine lea rning over the past few years\, today’s state of the art algorithms are bri ttle and do not generalize well. In contrast\, the brain is able to robustl y separate and categorize signals in the presence of significant noise and non-linear transformations\, and can extrapolate from single examples to en tire classes of stimuli. This performance gap between software and wetware persists despite some correspondence between the architecture of the leadin g machine learning algorithms and their biological counterparts in the brai n\, presumably because the two still differ significantly in the details of operation. The IARPA Machine Intelligence from Cortical Networks (MICrONS) program aims to bridge this gap and achieve a quantum leap in machine lear ning by creating novel machine learning algorithms that use neurally-inspir ed architectures and mathematical abstractions of the representations\, tra nsformations\, and learning rules employed by the brain. In this presentati on\, I will provide an overview of the MICrONS program and the research dir ections currently being pursued by MICrONS performers.\n LAST-MODIFIED:20161128T142852Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170228T181500Z DTEND:20170228T191500Z DTSTAMP:20260828T094430Z UID:62fcp5bcgoos6ntd90v029lksg@google.com CREATED:20170207T142214Z DESCRIPTION:Speaker Name: Professor Derek Paley\n\nSpeaker Institution: UMC P\n\nTitle: "Data-driven Modeling of Collective Behavior in Animal Groups"\ n\nAbstract: This talk will describe data-driven modeling of collective beh avior in two animal groups: fish and mosquitoes. Fish-behavior experiments reveal the role of intra-school interactions in rheotaxis and startle respo nse. We model these behaviors using tools from physics and epidemiology\, n amely the Kuramoto model of coupled oscillators and the Susceptible-Infecte d-Removed (SIR) epidemic model. Swarming and pursuit behaviors in wild mala rial mosquitoes were reconstructed to reveal three-dimensional flight patte rns. By studying the auto- and cross-correlation velocity statistics\, thes e patterns are well-modeled using a mechanistic approach based on Newtonian particles. \n\nhttp://jacobi.umd.edu/statphys LAST-MODIFIED:20170223T131450Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171023T190000Z DTEND:20171023T203000Z DTSTAMP:20260828T094430Z UID:0cbo6s6vqa55rp010gf57jg0rk@google.com CREATED:20171016T130948Z DESCRIPTION:Speaker: Gustavo Marques-Tavares\n\nSpeaker Institution: Stanfo rd University\n\nTitle: Light dark sector signals from Supernovae\n \nAbstr act: The central region of Supernovae are one of the hottest and densest re gions in the Universe. Due to the high temperatures\, particles with masses below hundreds of MeV can be easily produced if they have non-negligible c ouplings to the Standard Model. In this talk I will show that in a wide ran ge of dark sector models\, the dark matter flux from past Supernovae could be sufficiently large enough to be detected in current or future direct det ection experiments. LAST-MODIFIED:20171016T130948Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170406T180000Z DTEND:20170406T190000Z DTSTAMP:20260828T094430Z UID:dj6d2cdeb8cjkg8bvpht36s890@google.com CLASS:PUBLIC CREATED:20170313T173816Z DESCRIPTION:Daniel Farkas\, ColdQuanta\, Inc.\n\nTransitioning Cold Atoms O ut of the Lab\n\nTimekeeping\, navigation\, gravimetry\, field-sensing\, an d quantum information are applications where cold atoms and ions have alrea dy demonstrated the potential to outperform existing state-of-the-art techn ologies. Creating devices that can perform these functions outside of a lab oratory brings its own set of challenges. These devices must be compact\, r obust against large temperature swings and mechanical shock\, and consume v ery little power.\n \nI will present technologies that ColdQuanta is develo ping to address the challenges of portability\, miniaturization\, and relia bility of cold-atom systems. The first is centimeter-scale cold-atom beam s ources for atomic clocks and light-pulse interferometers. The second is the vacuum system that ColdQuanta is constructing for NASA’s Cold-Atom Laborat ory (CAL) mission\; I will review key features of this vacuum system and ho w they advance CAL’s scientific goals. Finally\, to advance quantum informa tion\, I will review ColdQuanta’s recent efforts to apply neutral-atom vacu um technology to develop cryogenic-based systems for ion trapping\, an area where we are collaborating with UMD and JQI.\n--- LAST-MODIFIED:20170313T173850Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI SPECIAL SEMINAR TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161107T160000Z DTEND:20161107T173000Z DTSTAMP:20260828T094430Z UID:btgpmm3prvo4ebtgrk15abn2co@google.com CREATED:20160929T142640Z DESCRIPTION:Speaker: Michael Wagman\n\nSpeaker Institution: University of W ashington\n\nTitle: QCD Aspects of Neutron Antineutron Oscillations\n\nAbst ract: The observed matter-antimatter asymmetry of the universe is an outsta nding mystery of physics that cannot be explained within the Standard Model . Many beyond the Standard Model (BSM) explanations have been proposed\, an d experimental data is needed to constrain the wide space of BSM models. Ne utron-antineutron oscillations are predicted to be a signature of some BSM baryogenesis models and can be cleanly probed by low-energy experiments. Co nnecting experimental data on neutron-antineutron transition rates to funda mental BSM theory parameters requires QCD matrix elements of six-quark oper ators effectively parameterizing BSM physics at low energies. I will discus s work to calculate neutron-antineutron transition matrix elements using la ttice QCD and the renormalization group. I will highlight how these QCD res ults can be used to reliably assess the reach of current and future neutron -antineutron experiments into BSM parameter space. LAST-MODIFIED:20161019T133757Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170417T220000Z DTEND:20170417T230000Z DTSTAMP:20260828T094430Z UID:2o71bs6elhr2745b08hj80fq6o@google.com CREATED:20170412T161932Z DESCRIPTION:Science Policy and Education with Courtney Lemon\n6pm in PSC 21 36 RSVP: ter.ps/spspolicy\n\nHosted by: The Society of Physics Students\nCo urtney is currently SPS Education Programs Coordinator at\nAIP and was the first female Mather Policy Intern with SPS in 2011\nFlyer: https://drive.go ogle.com/file/d/0Bz4x8ufYIK7fX1RKOTJIQWZxNUU/view?usp=sharing LAST-MODIFIED:20170412T163604Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Civic Engagement Week TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181001T110000 DTEND;TZID=America/New_York:20181001T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181001T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Wormholes and entangled states\n\nSpeaker: Juan Maldacen a\, Institute for Advanced Study (IAS)\, Princeton\n\nAbstract: The extende d Schwarschild solution is an example of a non-traversable wormhole. It can be viewed as an entangled state of two black holes. We will describe how direct interactions between the two black holes can render the wormhole tra versable. We will also discuss traversable wormhole solutions in four dimen sions. LAST-MODIFIED:20180911T204515Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170213T190000Z DTEND:20170213T200000Z DTSTAMP:20260828T094430Z UID:9ju3bb0587umj6c63de29ldodg@google.com CREATED:20170206T142057Z DESCRIPTION:Speaker: Robert Koenig\n\nSpeaker Affiliation: TU Munich\n\nTit le: Geometric inequalities for bosonic quantum systems\n\nAbstract: Shannon 's entropy power inequality gives a lower bound on the entropy power of the sum of two independent random variables in terms of the individual entropy powers. This statement and some of its consequences are information-theore tic counterparts of certain geometric inequalities. In this talk\, I will g ive an overview of analogous statements for bosonic quantum systems. The fi rst concerns a certain convolution operation between two quantum states: he re two independent bosonic modes combine at a beamsplitter. The second invo lves an operation (originally introduced by Werner) combining a probability distribution on phase space with a quantum state of a bosonic mode. The in equalities have application to certain semigroups as well as capacity probl ems.\n\nThe talk is based on joint work with Stefan Huber\, Graeme Smith\, and Anna Vershynina. LAST-MODIFIED:20170206T142057Z LOCATION:3100A Atlantic Building (Computer and Space Science) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160502T203000Z DTEND:20160502T213000Z DTSTAMP:20260828T094430Z UID:psol1ljk371d82f0ulbm13socc@google.com CREATED:20160425T173743Z DESCRIPTION:Speaker Name: Alexa J. Halford\n\nSpeaker Institution : NASA GS FC and Dept. of Physics and Astronomy\, Dartmouth College\n\nTitle : The Li ttle Mission that could: BARREL observations of a solar storm\n\nAbstract : The Balloon Array for Radiation belt Relativistic Electron Losses (BARREL) mission of opportunity working in tandem with the Van Allen Probes was des igned to study the loss of radiation belt electrons to the upper atmosphere . However BARREL is able to see X-rays from a multitude of sources. During the second campaign\, the Sun produced\, and BARREL observed\, an X-class f lare. This was followed by observations of X-rays\, gamma-rays\, and direct ly injected protons from the solar energetic particle event associated with the eruption from the Sun. Two days later the shock generated by the inter planetary coronal mass ejection (ICME-shock) hit the Earth while BARREL was in an amazing conjunction with the Van Allen Probes. We here at Earth only received a glancing blow of the iCME-shock and thus did not produce a larg e geomagnetic storm\, but the compression led to the formation of ultra low frequency (ULF) waves\, electromagnetic ion cyclotron (EMIC) waves\, and v ery low frequency (VLF) whistler mode waves. The combination of these waves and the enhancement of the local particle population led to precipitation of electrons remotely observed by BARREL. Others have gone on to study the effects of this CME at Mars as the red planet was directly in the path of t his CME. Although we do not discuss this here\, a storm like this would hav e large implications for a manned mission to Mars. \n\nNotes: full abstract at http://space.umd.edu/seminars/showAbstract/0502161630 LAST-MODIFIED:20160428T184449Z LOCATION:CSS Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171027T110000 DTEND;TZID=America/New_York:20171027T115000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com RECURRENCE-ID;TZID=America/New_York:20171020T110000 CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nFifth lecture: Neural Network Implementation (keras examples\; examp les of bad implementation and consequences)\n\nCourse description: This sho rt course covers the fundamentals of machine learning\, assuming the typica l background and motives of a physicist. It's goal is to give those who att end an understanding of the field and its capabilities\, as well the tools to learn the necessary extensions of the topic to apply it to their physics research. Lectures will include introductions to Python\, Linux\, neural n ets\, deep learning\, natural language processing\, imagine recognition/com puter vision\, and AI safety.\n\nRSVP for the first friday here: http://bit .ly/2xgpvDE\njustinkterry@gmail.com LAST-MODIFIED:20171020T151900Z LOCATION:Edward St. John 2208 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170207T181500Z DTEND:20170207T191500Z DTSTAMP:20260828T094430Z UID:a16cu9e9iompdu86jcbp7jt2h0@google.com CREATED:20170124T144442Z DESCRIPTION:Speaker Name: Mr. Ang Gao\n\nSpeaker Institution: UMCP\n\nTitle : "How Do Long-ranged Interactions Affect Hydrophobic Hydration and Associa tion: An LMF Study"\n\nAbstract:\n\nHydrophobic interactions play a key rol e in phenomena raging from oil-water demixing to biological processes like protein folding and membrane formation. The hydrophobicity of solutes origi nates from the distortion and disruption of local hydrogen bonds and the un balanced long ranged forces acting on the interfacing waters. The slowly va rying nature of long ranged Coulomb and van der Waals forces makes it possi ble to use local molecular field (LMF) theory\, a mean-field- like approach \, to theoretically account for their contribution to the hydrophobicity. I n this talk\, I will show how the application of a new symmetric version of LMF theory helps clarify the roles VdW attractions and long-ranged electro static interactions play in the solvation and association of apolar solutes in water. In the LMF approach\, a minimal model of the aqueous solution wi th "short" water is used as a reference and LMF equations are used to show that modified solute-water and solute-solute interactions can be chosen to make the solutes have the "correct" hydrophobicity. In addition to computat ional advantages\, LMF theory provides a simple physical picture and a conc eptual framework for understanding the basic phenomena of solvent-induced e ffective interactions between solutes. The theory is tested for both small solutes around which the local hydrogen bonds are mainly intact and large s olutes around which the local hydrogen bonds are completely broken. LAST-MODIFIED:20170206T153235Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181001T203000Z DTEND:20181001T213000Z DTSTAMP:20260828T094430Z UID:01s0rsstt9ukqeii6f1jaiiidg@google.com CREATED:20180829T173305Z DESCRIPTION:Title: The Origin of Old Globular Clusters and Ultra-faint Dwar f Galaxies and Implications on the Reionization Epoch

Speaker: Massimo Ricotti\, \;Department of Astronomy\, University of Maryland

Abstract: I wi ll describe my research on galaxy formation before the epoch of reionizatio n\, focusing on understanding what determines the size and morphology of st ellar objects in the first low mass galaxies\, using parsec-scale cosmologi cal simulations performed with an adaptive mesh hydrodynamics code. Globula r clusters and a recently discovered population of ultra-faint dwarf galaxi es are among the oldest objects in the universe. I will argue that\, althou gh their appearance is very different today\, they may have common origins at formation. I will discuss the consequences for reionization of the inter galactic medium and near-field cosmology.

Notes: Coffee\, Tea and Sn acks 4:15-4:30 PM LAST-MODIFIED:20180911T041620Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180309T200000Z DTEND:20180309T213000Z DTSTAMP:20260828T094430Z UID:0d1qvv6erqlc2ip0cun3c7j6fv@google.com CREATED:20180223T142500Z DESCRIPTION:\n\nSpeaker: Charles W. Misner\n\nSpeaker Institution: Universi ty of Maryland\n\nTitle: What the Einstein Equations think may be happening inside quiescent black holes \n\nAbstract: Most physicists agree that t he singularities asserted by Einstein’s GR equations imply that GR must be supplanted by something better under extreme circumstances. Many think that the replacement theory will involve changes to the known properties of mat ter at extremely high densities\, or by a quantum theory applicable to extr emely high spacetime curvatures. I worry that some other areas may need stu dy\, as the intolerable physical assertions made by the classical Einstein equations may be singularities occurring neither at high matter densities n or at quantum level high curvatures. In the case of gravitational collapse to a black hole\, I find that even in the case of spherically symmetric col lapse\, matter plays a role only in the brief formation stage of the black hole\, and that it does not remain part of the BH structure. Consider\, for example\, the GW150914 BH coalescence. There the matter that may have help ed the two initial BHs form is\, by the time they collide\, removed a space like distance of hundreds of millions of light years (or more) away from th ese BHs. Thus a study of the Oppenheimer-Snyder collapse from the Finkelste in viewpoint shows that the collapsing matter acts merely as an enzyme help ing to pull some empty spacetime into a self-sustaining stable curved form\ , after which service the enzymatic matter is discarded into a graveyard at a nearly cosmologically distant place. But to be a physical assertion\, ev en from a dubious theory\, the proposed dynamics must be generic and repeat able. The spherically symmetric BH doesn’t thus qualify\; all expected BHs in Nature are thought to have some angular momentum. In the Kerr metric\, i nside the BH there is a Cauchy horizon at modest curvature. Higher curvatur e regions beyond that Cauchy horizon appear only if one relies on analytic continuation (rather than causal evolution)\, so one should rather say that it appears the Einstein equations recuse themselves from offering an opini on at those higher curvature regions. LAST-MODIFIED:20180306T162459Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160407T170000Z DTEND:20160407T180000Z DTSTAMP:20260828T094430Z UID:0e8k4ckkcafrt0m7248sa1nft8@google.com CREATED:20160407T155300Z DESCRIPTION:Speaker: Artan Sheshmani (Ohio State and MIT) - https://people. math.osu.edu/sheshmani.1/Welcome.html\nAbstract: I will talk about derivat ion of an explicit formula for the generating function of all DT invariants counting "vertical" two dimensional sheaves on K3 fibrations. The final ex pressions will be shown to satisfy strong modularity properties. In particu lar I will talk about a new construction of vector valued modular forms whi ch emerges from the geometric framework\, exhibiting some of the features o f a Hecke transform. This is joint work with Vincent Bouchard\, Thomas Creu tzig\, Emanuel Diaconescu\, Charles Doran and Callum Quigley. LAST-MODIFIED:20160407T155300Z LOCATION:Math 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Vertical DT invariants and modular forms (note special time and pla ce --- combined with Algebra Seminar) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180205T210000Z DTEND:20180205T223000Z DTSTAMP:20260828T094430Z UID:6rqle87b4s6pg28v48ino99nlo@google.com CREATED:20180124T165728Z DESCRIPTION:\nSpeaker: Ken Van Tilburg\n\nSpeaker Institution: IAS & NYU\n\ nTitle: Resonant Absorption of Dark Matter in Molecules \n\nAbstract: I wi ll present a proposal for a new class of bosonic dark matter (DM) detectors based on resonant absorption onto a gas of small polyatomic molecules. Bos onic DM acts on the molecules as a narrow-band perturbation\, like an inten se but weakly coupled laser.\nThe excited molecules emit the absorbed energ y into fluorescence photons that are picked up by sensitive photodetectors with low dark count rates. This setup is sensitive to any DM candidate that couples to electrons\, photons\, and nuclei\, and may improve on current s earches by several orders of magnitude in coupling for DM masses between 0. 2 eV and 20 eV. This type of detector has excellent intrinsic energy resolu tion\, along with several control variables---pressure\, temperature\, exte rnal electromagnetic fields\, molecular species/isotopes---that allow for p owerful background rejection methods as well as precision studies of a pote ntial DM signal. The proposed experiment does not require usage of novel ex otic materials or futuristic technologies\, relying instead on the well-est ablished field of molecular spectroscopy\, and on recent advances in single -photon detection. Cooperative radiation effects\, which arise due to the l arge spatial coherence of the nonrelativistic DM field in certain detector geometries\, can tightly focus the DM-induced fluorescence photons in a dir ection that depends on the DM's velocity\, permitting a detailed reconstruc tion of the full 3D velocity distribution in our Galactic neighborhood\, as well as further background rejection. LAST-MODIFIED:20180202T135917Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180228T160000Z DTEND:20180228T170000Z DTSTAMP:20260828T094430Z UID:565pv43km6hp8q8b9sh4kq67t6@google.com CREATED:20180214T140622Z DESCRIPTION:Speaker Name: Alicia Kollar\n\nSpeaker Institution: Princeton \n\nTitle: Hyperbolic and Flat-Band Lattices in Circuit QED\n\nAbstract: After close to two decades of research and development\, superconducting c ircuits have emerged as a rich platform for both quantum computation and qu antum simulation. Lattices of superconducting coplanar waveguide (CPW) reso nators have been shown to produce artificial materials for microwave photon s\, where weak interactions can be introduced either via non-linear resonat or materials and strong interactions via qubit-resonator coupling. The uniq ue deformability of coplanar waveguide microwave resonators enables realiza tion of artificial photonic materials which cannot be made from ordinary at omic or ionic systems. We will present two such examples. First\, we will i ntroduce a technique using networks of CPW resonators to create a new class of materials which constitute regular lattices in an effective hyperbolic space with constant negative curvature. We will show numerical simulations of hyperbolic analogs of the kagome lattice which show unusual densities of states with spectrally-isolated degenerate flat bands. We will also presen t an experimental realization of one of these lattices as a proof of princi ple and a first step towards on-chip quantum simulation of materials scienc e and interacting particles in curved space. Second\, we will present a nov el Euclidean lattice\, called the heptagon-pentagon-kagome (HPK) lattice\, which displays a flat band with a particularly large gap. Because this flat band is spectrally isolated and dispersion-less\, interactions will be the dominant energy scale\, enabling the study of strongly correlated\, many-b ody photon states. LAST-MODIFIED:20180214T140935Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:AMO Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170505T161500Z DTEND:20170505T171500Z DTSTAMP:20260828T094430Z UID:1emjd63u7jv59id1ut58hnu5hk@google.com CREATED:20170426T154307Z DESCRIPTION:Speaker Name: Caroline Figgatt\n\nSpeaker Institution: JQI\n\nT itle: Complete 3-Qubit Grover Search on a Programmable Quantum Computer\n\n Abstract: Searching large databases is an important problem with broad appl ications. The Grover search algorithm provides a powerful method for quantu m computers to perform searches with a quadratic speedup in the number of r equired database queries over classical computers. Here\, we report results for a complete three-qubit Grover search algorithm using the scalable quan tum computing technology of trapped atomic ions\, with better-than-classica l performance. The algorithm is performed for all 8 possible single-result oracles and all 28 possible two-result oracles. Two methods of state markin g are used for the oracles: a phase-flip method employed by other experimen tal demonstrations\, and a Boolean method requiring an ancilla qubit that i s directly equivalent to the state-marking scheme required to perform a cla ssical search. All quantum solutions are shown to outperform their classica l counterparts. We also report the first implementation of a Toffoli-4 gate \, which is used along with Toffoli-3 gates to construct the algorithms\; t hese gates have process fidelities of 70.5% and 89.6%\, respectively. LAST-MODIFIED:20170501T120737Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180417T171500Z DTEND:20180417T181500Z DTSTAMP:20260828T094430Z UID:2c59867ja6atqhvuua5ngn7m5n@google.com CREATED:20180410T132021Z DESCRIPTION:Speaker: Dr. Omar Valsson\, Max Planck Institute for Ploymer Re search\, Mainz\, Germany

Title: Bridging Time Scales with Variationa lly Enhanced Sampling

Abstract: The usefulness of atomistic simulati ons is generally hampered by the presence of several metastable states sepa rated by high barriers leading to kinetic bottlenecks. Transitions between metastable states thus occur on much longer time scales than one can simula te. Numerous enhanced sampling methods have been introduced to alleviate th is time scale problem\, including methods based on identifying a few crucia l order parameters and enhancing their sampling through the introduction of external biasing potential. Here will we discuss Variationally  \;Enhanced Sampling (Valsson and Parri nello\, PRL 113 090601\, 2014)\, a generally applicable enhanced sampli ng method where an external bias potential is constructed by minimizing a c onvex functional. We present numerous examples from physics and chemistry w hich show the flexibilty and practicality of the method. We will furthermor e show how the variational \;property of the method can be used to extend the method in various innovative ways. For example: to o btain kinetic information from atomistic simulation\; to accelerate nucleat ion events by employing models from classical nucleation theory\; and to in corporate experimental information into molecular simulations. We will also introduce the VES code (http://www.ves-code.org )\, an open-source library for the PLUMED 2 plugin that implements methods based on Variationally \;Enhanced Sampling. LAST-MODIFIED:20180412T201625Z LOCATION: IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180905T193000Z DTEND:20180905T203000Z DTSTAMP:20260828T094430Z UID:0tbp5snp9gd9bv5mcird8gf9bq@google.com CREATED:20180831T165029Z DESCRIPTION:Speaker: Dr. George Wilkie\, Chalmers University\n\nTitle : Fa st spectral solution method for the nonlinear Boltzmann equation with appli cations\n\nAbstract : Recent advances in applied mathematics (Gamba and Rja sanow\, JCP 2018) make direct solution of the Boltzmann equation particular ly accessible. A recently-developed implementation\, LightningBoltz\, has b een optimized\, parallelized\, and rigorously benchmarked. Features include general large-angle\, inelastic\, and/or self-collisions. Collision matric es are pre-computed and stored on an online database\, making time advancem ent remarkably efficient. I will also discuss possible future applications for this tool including discharges\, reentry blackout\, tokamak divertors\, runaway electrons\, carbon sequestration\, and more. LAST-MODIFIED:20180831T165158Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161027T163000Z DTEND:20161027T173000Z DTSTAMP:20260828T094430Z UID:5qks7mjhc2qmmjlste2hf9cplk@google.com CREATED:20160826T134605Z DESCRIPTION:Speaker Name: Sean Downey\n\nSpeaker Institution: University o f Maryland College Park\n\nTitle : European Neolithic societies (8000-4000 BP) exhibited early warning signs in advance of dramatic social collapse: N ew evidence from modeling and computational statistics\n\n LAST-MODIFIED:20161026T024545Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - European Neolithic societies (8000-4000 BP) exhibited early warning signs in advance of dramatic social collapse: N ew evidence from modeling and computational statistics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170216T173000Z DTEND:20170216T183000Z DTSTAMP:20260828T094430Z UID:nvf7u3kg37fp95f4r9309t99lc@google.com CREATED:20170127T152625Z DESCRIPTION:Speaker Name: Isaac Mayorgoyz\n\nSpeaker Institution : Electric al and Computer Engineering - University of Maryland\n\nTitle : Plasmon Res onances in Nanoparticles and the Reimann Hypothesis LAST-MODIFIED:20170127T152730Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170206T203000Z DTEND:20170206T213000Z DTSTAMP:20260828T094430Z UID:D6BAAE22-3C19-4DF9-98CE-1ACE8F85E7D8 CREATED:20170125T171121Z DESCRIPTION:Speaker Name: Dr. Marcos Santander\n\nSpeaker Institution : Col umbia University\n\nNotes: Refreshments available beginning at 3 PM.\n\nTit le : JSI Colloquium: "Searching for Cosmic-ray Sources with High-energy Neu trinos and Gamma-rays"\n\nAbstract : A century of research on cosmic rays h as revealed many of the fundamental properties of these energetic particles \, such as their chemical composition and energy spectrum. The sources of c osmic rays\, however\, remain unknown. The discovery of a flux of high-ener gy astrophysical neutrinos by the IceCube observatory in 2013 may hold the key to solving this enduring question. High-energy neutrinos\, as well as g amma rays\, are produced in hadronic cosmic-ray interactions occurring at t heir source or during propagation. While no neutrino source has been identi fied so far\, the sensitivity of these studies can be increased by searchin g for gamma-ray counterparts in temporal and spatial correlation with the I ceCube neutrino events. The detection of gamma-ray emission in coincidence with an astrophysical neutrino would represent a smoking-gun signature of a cosmic-ray production site and potentially reveal details about the accele ration medium. In this talk I will present the status and recent results fr om the neutrino follow-up program of the VERITAS observatory\, an air-Chere nkov telescope array in southern Arizona USA dedicated to gamma-ray astrono my in the very-high-energy range (VHE\, E > 100 GeV). I will also describe prospects for neutrino follow-up observations using the Cherenkov Telescope Array\, a next-generation VHE gamma-ray instrument.\n\n\nSuggestions for c olloquium speakers are welcome. Please contact the JSI Colloquium committe e:\n\nJudy Racusin (NASA/GSFC) / Massimo Ricotti (UMD Astronomy) / Jona than McKinney (UMD Physics) LAST-MODIFIED:20170125T175505Z LOCATION:1136 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquim TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170327T200000Z DTEND:20170327T213000Z DTSTAMP:20260828T094430Z UID:a0pjtikt2l48asis8gc0kavsmk@google.com CREATED:20170315T130726Z DESCRIPTION:Speaker: Diptimoy Ghosh\n\nSpeaker Institution: Weizmann Instit ute of Science\n\nTitle: Hints of new physics in semi-leptonic B-meson deca ys\n\nAbstract: In recent years\, a number of interesting signals of potent ial new physics in semi-leptonic B-meson decays have been reported both by the B-factories \nas well as the LHCb. In this talk\, I will discuss these observations with a \nparticular emphasis on the observable $R_{D^*}$\, the ratio of the branching \nfraction of $\\bar{B} \\to D^* \\tau \\bar{\\nu}_ \\tau$ to that of $\\bar{B} \n\\to D^* \\ell \\bar{\\nu}_\\ell (\\ell = \\m u\, e )$\, which shows a 3.3 sigma deviation \nfrom the Standard Model pred iction. I will present an effective field theory \nanalysis of these potent ial new physics signals and discuss possible ways to distinguish the variou s operators. LAST-MODIFIED:20170315T130726Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171011T190000Z DTEND:20171011T200000Z DTSTAMP:20260828T094430Z UID:6cfup2e2h96jdn5d9jjfqj16ut@google.com CREATED:20171006T154711Z DESCRIPTION:Speaker: Prof. Gregory Huff\n\nTitle: The pedagogy and practic e of enabling electromagnetic agility in intelligent cyberphysical systems\ n\nAbstract: Autonomous vehicles\, robotic platforms\, and other distribute d networks of wirelessly-connected intelligent cyber-physical systems have become indispensable tools in science\, industry\, and defense. The serve a s aggregators and data mules for dense or remote IoT sensor networks\, perf orm complex tasks in physically hostile or extreme environments\, and provi de utility to numerous other application spaces that reach across air\, sea \, ground\, and space. Advances in software defined radios\, machine learni ng techniques\, and distributed control algorithms have coalesced to create new operational paradigms and application spaces for these systems\, but c ritical technology gaps remain when considering their physical interaction with the electromagnetic spectrum. The impact of these gaps extends from co mplex cybersecurity vulnerabilities to maintaining basic wireless connectiv ity for emergency command and control. This is compounded by the increased deployment of these distributed systems as unstructured clusters of mobile wireless agents that morph their distribution over time. This talk will dis cuss recent advances in electromagnetic reconfiguration mechanisms\, multi- physics approaches to approve physical resiliency\, and orientation and con text awareness using reconfigurable antennas for adaptive sensing\, localiz ation\, and distributed beamforming techniques. This includes the developme nt of MEDUSA\, a computer vision-assisted phased array controller engineere d to study the behavior of unstructured volumetric arrays and morphing clus ters\, and the development of structurally-embedded vascular antennas (SEVA s). LAST-MODIFIED:20171006T154711Z LOCATION: LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160913T171500Z DTEND:20160913T181500Z DTSTAMP:20260828T094430Z UID:pl09jao801ud40ledqdfgnbp20@google.com CREATED:20160908T142902Z DESCRIPTION:Speaker Name: Professor Tom Chou\n\nSpeaker Institution : UCLA\ n\nTitle : A kinetic theory of birth\, death\, and fission of age-structure d populations\n\nAbstract: Classical age-structured mass-action models suc h as the McKendrick-von Foerster equation have been extensively studied but they are structurally unable to describe stochastic fluctuations or popula tion-size-dependent birth and death rates. We present a semi-Markov stochas tic model of populations that incorporate age-dependent birth\, death\, and fission rates. By defining multiparticle probability density functions\, w e derive a hierarchy of kinetic equations for the stochastic evolution of a n aging population undergoing birth\, death\, and fission. We show that the fully stochastic age-dependent birth-death process precludes factorization of the corresponding probability densities\, which then must be solved by using a BBGKY-like hierarchy. Our results generalize both deterministic mod els and existing master equation approaches by providing an intuitive and e fficient way to simultaneously model age- and population-dependent stochast ic dynamics applicable to the study of demography\, stem cell dynamics\, an d disease evolution. LAST-MODIFIED:20160908T143029Z LOCATION:IPST 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - Title : A kinetic theory of birth\, death\, and fission of age-structured populations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180719T170000Z DTEND:20180719T183000Z DTSTAMP:20260828T094430Z UID:5aq7tckuvs3jsqgm2ikno15og7@google.com CREATED:20180608T181359Z DESCRIPTION:Speaker: Jacob Bickerton \n\nTitle: Transverse spin structure o f octet baryons using Lattice QCD\n\n\nSpeaker Institution: The University of Adelaide\nAbstract: The transverse spin structure of matter is a subject of research that has not been thoroughly explored experimentally\, providi ng the opportunity to produce key insight from lattice QCD. These transvers e spin densities are revealed through an analysis of the electromagnetic an d tensor form factors of the octet baryons with pion masses as low as 220 M eV. Using the SU(3) flavour-breaking effects of the form factors allows ext rapolation to the physical mass. Constructing combinations of Fourier trans formed form factors reveal non-trivial spin densities in the infinite momen tum transverse plane\, with similar deformations across the baryon octet. LAST-MODIFIED:20180719T202315Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180602T230000Z DTEND:20180603T003000Z DTSTAMP:20260828T094430Z UID:26bpgu4htkqlm9bnfr646jenoi@google.com CREATED:20180517T174228Z DESCRIPTION:Physics is Phun Community Event
Program offered both Friday 6/1 and Saturday 6/2 at 7:00 pm.

https://umdphysics.umd.edu/events/aboutus -outreach/physics-is-phun.html

For information: lecdemo_outreach@physics. umd.edu LAST-MODIFIED:20180517T174228Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Full Spectrum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170913T190000Z DTEND:20170913T203000Z DTSTAMP:20260828T094430Z UID:298rhpfsf9jmuqelph9hm4jmb7@google.com CREATED:20170825T132213Z DESCRIPTION:Speaker: Phuc Nguyen\n\nSpeaker Institution: University of Mary land\n\nTitle: Holographic complexity and the thermodynamic volume\n\nAbstr act: It has been suggested that the length of a non-traversable wormhole in AdS is dual to the complexity of the field theory state on the boundary. T here exist different ways to quantify the length of the wormhole\, however. Two such ways have been considered in the literature: the volume of a maxi mal slice across the wormhole\, and the action of the Wheeler-DeWitt patch. In this talk\, we present a third way to quantify the wormhole's length ba sed on the spacetime volume of the Wheeler-DeWitt patch. We show that there is a surprising connection with the notion of thermodynamic volume\, and t hat moreover our proposal is consistent with the Lloyd bound. LAST-MODIFIED:20170825T132213Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160506T190000Z DTEND:20160506T200000Z DTSTAMP:20260828T094430Z UID:p7cvabu1t5op8r8o7rf0bg5fq4@google.com CLASS:PUBLIC CREATED:20160427T141711Z DESCRIPTION:\n\n"Blair Magnet Research Project Program Overview"\n\nby Ange lique Bosse\, Science Magnet Program- Montgomery Blair High School LAST-MODIFIED:20160427T141711Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161207T190000Z DTEND:20161207T200000Z DTSTAMP:20260828T094430Z UID:07s1tms8nbf6fahm6jqsarules@google.com CREATED:20161130T191846Z DESCRIPTION:Seminar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm. Times are tentative.\n\nSpeaker: Petar Maksimovic\n\nSpea ker Institution: Johns Hopkins University\n\nTitle: Detecting Boosted Top/H iggs/W/Z at Hadron Colliders\n\nAbstract: The Large Hadron Collider is deli vering an unprecedented amount of data at the center-of-mass energy of 13 T eV\, the highest achieved so far. This allows a substantial increase in th e sensitivity to beyond-Standard Model (BSM) physics. A variety of BSM mod els predict existence of new heavy resonances\, many of which may dominantl y decay to heavy standard model particles: W\, Z\, or Higgs bosons\, and a top quark. If the BSM resonances are heavy\, the standard model particles will be very energetic and thus highly Lorentz-boosted. The reconstruction of these particles presents unique challenges and opportunities\, both of which I will review in this talk\, along with flagship searches from the LH C experiments featuring highly boosted objects. LAST-MODIFIED:20161202T185305Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Particle theory-experiment Maryland-Hopkins Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160809T150000Z DTEND:20160809T163000Z DTSTAMP:20260828T094430Z UID:mem59chu9onldfkamnhgm1m9tc@google.com CREATED:20160801T150926Z DESCRIPTION:Speaker: Yuya Tanizaki\n\nSpeaker Institution: RIKEN\, Brookhav en National Laboratory\n\nTitle: Lefschetz-thimble path integral for studyi ng the Silver Blaze phenomenon\n\nAbstract: Recently\, Picard-Lefschetz the ory gets much attention in the context of the sign problem\, because it ena bles us to study the system with the complex classical action nonperturbati vely by employing the semiclassical analysis. In this seminar\, after its b rief introduction\, I will apply it to the one-site Hubbard model. This mod el has a severe sign problem\, which looks quite similar to that of the fin ite-density QCD at low temperatures. By solving this model using the Lefsch etz-thimble path integral\, we are trying to understand the structure of th e sign problem of finite-density QCD. Especially\, I give a qualitative pic ture (or speculation) about the early-onset problem of the baryon number de nsity\, called the baryon Silver Blaze problem. The complex Langevin method will also be discussed if time allows. LAST-MODIFIED:20160808T123204Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161109T210000Z DTEND:20161109T223000Z DTSTAMP:20260828T094430Z UID:uvb9veovvd3e6gvghrfgtdhvbo@google.com CREATED:20161104T142103Z DESCRIPTION:Speaker Name: Sarah Eno\n\nSpeaker Institution : University of Maryland\n\nTitle: "More than You Ever Wanted to Know about Plastic Scinti llator"\n\nAbstract : Plastic scintillators are a common material in HEP ex periments due to their low cost and high light output. They are\, however\, subject to radiation damage. In this talk\, I'll review the vast literatur e on plastic scintillators and what is known about the mechanisms for radia tion damage. LAST-MODIFIED:20161104T142246Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180326T193000Z DTEND:20180326T203000Z DTSTAMP:20260828T094430Z UID:1d8jp736o8s2mpst3s05pg2dnk@google.com CREATED:20180309T210003Z DESCRIPTION: Title : Re lativistic Turbulence in Binary Neurton Star Mergers and AGN Jets
Speake r Name: Jonathan Zrake
Speaker Institution : Columbia University
Note s: Refreshments available beginning at 3 PM.
A bstract : I will discuss relativistic turbulence in high energy astrophysic s and present two recent advances in its theory and computation. First\, I' ll show that turbulence\, driven during the merger of a binary neutron star (BNS) system\, produces rapid dynamo action and ultra-strong magnetic fiel ds in the merger remnant and may produce an X-ray transient detectable by S wift (/Integral/Fermi). I will discuss the implications for GW170817 and fu ture multi-messenger BNS merger detections. Second\, I will present new res ults regarding charged particle acceleration by jets in active galactic nuc lei (AGN). By performing ab initio supercomputer simulations of relativisti c plasma\, we have found a new process that efficiently accelerates non-the rmal particles. This mechanism accompanies the helical kink instability\, w hich operates in the current-carrying spine AGN jets\, dissipating their el ectromagnetic power. This study reveals new evidence in favor of AGN jets a s sources of ultra-high energy cosmic rays. LAST-MODIFIED:20180309T210239Z LOCATION: PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170628T150000Z DTEND:20170628T160000Z DTSTAMP:20260828T094430Z UID:j27325jmooj64s5ohu1mvnsdc4@google.com CREATED:20170502T134412Z DESCRIPTION:Speaker: David Gosset\n\nSpeaker Affiliation: IBM\n\nTitle: Qua ntum advantage with shallow circuits\n\nAbstract: We prove that constant-de pth quantum circuits are more powerful than their classical counterparts. W e describe an explicit (i.e.\, non-oracular) computational problem which ca n be solved with certainty by a constant-depth quantum circuit composed of one- and two-qubit gates. In contrast\, we prove that any classical probabi listic circuit composed of bounded fan-in gates that solves the problem wit h high probability must have depth logarithmic in the input size. This is j oint work with Sergey Bravyi and Robert Koenig (arXiv:1704.00690). LAST-MODIFIED:20170502T134412Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180220T160000Z DTEND:20180220T170000Z DTSTAMP:20260828T094430Z UID:3nrdgbrf1bjftfqcvokbbr0624@google.com CREATED:20180216T142817Z DESCRIPTION:

Speaker Name:  \;Dr. Peter McMahon

Speaker Institution: Department of Applied Physics\, Stanford University

Title: \; Non-von Neumann compu ting using networks of optical parametric oscillators

Abstra ct: \; Combinatorial optimization problems are central in numerous impo rtant application areas\, including operations and scheduling\, drug discov ery\, finance\, circuit design\, sensing\, and manufacturing. There is a lo ng history of attempts to find alternatives to current von Neumann-computer -based methods for solving such problems\, including neural networks\, DNA computing\, and most recently adiabatic quantum computation and quantum ann ealing.

Networks of coupled optical parametric osc illators (OPOs) are an alternative physical system\, with an unconventional operating mechanism\, for solving the Ising problem\, which is an NP-hard optimization problem. We have realized a fully-programmable 100-spin Ising machine using a network of OPOs\, and with it can solve many different Isin g problem instances. Our design supports all-to-all connectivity among the implemented spins via a combination of time-division multiplexing and measu rement feedback.

In this talk\, I will describe ou r work on constructing Ising machines using OPO networks with feedback and will present the experimental results from our first prototype system.

< p dir="ltr" style="">[1] P.L. McMahon\, et al. \;Science \;354\, 63 12\, pp. 614-617 (2016).

Bio: Peter McMahon receiv ed his Ph.D. in Electrical Engineering in 2014 from Stanford University in the group of Yoshihisa Yamamoto. His graduate work was on the development o f building blocks for quantum computers and quantum repeaters using semicon ductor systems. He subsequently began a postdoctoral appointment jointly in the groups of Hideo Mabuchi and Yoshihisa Yamamoto\, working on the develo pment of hybrid optical-electronic computing machines using principles and techniques borrowed from quantum optics.

LAST-MODIFIED:20180216T143016Z LOCATION:Room 1207\, Energy Research Facility (ERF) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QTC Faculty Candidate Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181128T160000Z DTEND:20181128T170000Z DTSTAMP:20260828T094430Z UID:00gqqvnuajrj4r87vta0f83mnq@google.com CREATED:20180905T135905Z DESCRIPTION:Speaker: Renee Stover\, Graduate Student Literature Seminar\ , UMCP

Title: TBA LAST-MODIFIED:20180905T135916Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180227T150000Z DTEND:20180227T160000Z DTSTAMP:20260828T094430Z UID:5mj67d92k5ri4k6g3dpjftb2jp@google.com CREATED:20180223T204423Z DESCRIPTION:Speaker Name: \; Dr. Sangeng Wu

Speaker Institution:  \; MIT

Title: \; Topology and Correlations in Monolayer Cry stals

Abstract: \; \;Topology and correlations are two fundamental aspects that determine the electronic ground states of quantum systems. Both aspects individually hav e led to striking observations such as the quantum spin Hall insulating sta te and superconductivity\, respectively. The combination of them can result in exotic phenomena including non-abelian anyons\, which is the key to top ological quantum information technology. In this talk I will discuss our re cent study on a monolayer atomic crystal\, i.e.\, tungsten ditelluride (WTe 2)\, where we find that topology and correlations are simultaneously import ant in understanding its ground state properties. I will first talk about o ur quantum transport measurements for identifying the undoped monolayer WTe 2 as a two-dimensional topological insulator. The observation of the quantu m spin Hall effect surviving up to 100 Kelvin will be discussed. I will the n report the observation of superconductivity below 1 Kelvin when the same monolayer is electrostatically doped through dielectric gating. These obser vations demonstrate that the ground state of the monolayer is remarkably ga te-tunable between the two extremes of electronic transport in materials (i nsulator and superconductor). Our results establish two-dimensional crystal s as a novel material platform for engineering rich electronic phenomena dr iven by topology and correlations\, allowing for the creation\, manipulatio n \;and detection of non-abelian quantum particles based on atomic mono layers.

 \;

Bio: Sanfeng Wu grew up in Hefei\, China. He is currently a Pappalardo Fellow in Physics at MIT. He received his undergraduate degree at the Unive rsity of Science and Technology of China in 2010 and his Ph.D. in physics a t the University of Washington\, Seattle in 2016. \;His research intere sts focus on engineering quantum phenomena in low-dimensional electronic&nb sp\;systems\, particularly the atomically thin crystals and the atomic hete rostructures created from them.

LAST-MODIFIED:20180223T204603Z LOCATION:2460 A.V. Williams SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160421T123000 DTEND;TZID=America/New_York:20160421T133000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8_R20160421T163000@google.com RECURRENCE-ID;TZID=America/New_York:20160421T123000 CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Ken Showalter\n\nSpeaker Institution: West Virgi nia University\, Department of Chemistry\n\nSynchronization in Populations of Chemical Oscillators:\nQuorum Sensing\, Phase Clusters and Chimeras\n\nW e have studied large\, heterogeneous populations of discrete chemical oscil lators (~100\,000) to characterize two different types of density-dependent transitions to synchronized behavior\, a gradual Kuramoto synchronization and a sudden quorum sensing synchronization. We also describe the formation of phase clusters\, where each cluster has the same frequency but is phase shifted with respect to other clusters\, giving rise to a global signal th at is more complex than that of the individual oscillators. Finally\, we de scribe experimental and modeling studies of chimera states and their relati on to other synchronization states in populations of coupled chemical oscil lators.\n\nA. F. Taylor et al.\, Science 323\, 614 (2009).\nA. F. Taylor et al.\, Angewandte Chemie Int. Ed. 50\, 10161 (2011).\nM. R. Tinsley et al.\ , Nature Physics 8\, 662 (2012).\nS. Nkomo et al.\, Phys. Rev. Lett. 110\, 244102 (2013).\nJ. F. Totz et al.\, Phys. Rev. E 92\, 022819 (2015).\n LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170328T150000Z DTEND:20170328T161500Z DTSTAMP:20260828T094430Z UID:k7e8r9eco3sh4durjjje8qomc4@google.com CREATED:20170109T165820Z DESCRIPTION:Speaker: Congjun Wu (UCSD)\n\nTitle: Novel orbital phases in op tical lattices and solids – unconventional BECs and large gap topological s tates\n\nAbstract: Orbital is a degree of freedom independent of charge and spin\, which plays an important role in the study of transition-metal-oxid es. Recently\, cold atom optical lattices have opened up a new opportunity to investigate orbital physics. In this talk\, we will present its novel fe atures in optical lattices\, and also apply them for novel states in solids as well. \n\nOrbital physics in solids typically studies electrons\, which are fermions. In contrast\, bosons in optical lattices\, when pumped into high orbital bands\, become orbital-active. We predicted a class of novel s uperfluid states of orbital bosons which spontaneously break time-reversal sym-metry. These states are beyond the scope of “no-node” theorem which con strains many BECs including Helium and atomic systems. They exhibit unconve ntional symmetries (e.g. p-wave) in analogy to unconventional superconducti vity. They have been experimentally realized by Hemerich’s group at Hamburg \, and their p-wave symmetry was observed through matter-wave interference and time-of-flight measurements. For fermions\, we have studied the orbital active px/py-orbital bands in the 2D honeycomb lattice. Their physics is v ery different from graphene\, and can be applied to both optical lattices a nd various solid state systems including organic-metal-frameworks\, semicon ductor quantum dots\, and 2D materials like Stanene. The interplay between orbital structure and spin-orbit coupling gives rise to quantum spin Hall s tate and quantum anomalous Hall state with large topological gaps. The gap magnitudes are equal to the spin-orbit coupling strength at the atomic leve l\, and thus are much larger than those based on the s-p band inversion. In the Mott-insulating state\, orbital exchange is highly frustrated describe d by a quantum 120$^\\circ$ model which is similar to but different from th e Kitaev model. An f-wave Cooper pairing arises if the band is filled with spinless fermions exhibiting boundary Majorana edge modes. Although the pai ring mechanism is conventional\, the unconventional pairing symmetry is dri ven by the non-trivial band structure. \n\nRef. \n1) C. Wu\, "Unconvention al Bose-Einstein Condensations Beyond the ``No-node'' Theorem"\, Mod. Phys. Lett. 23\, 1 (2009)\, a brief review. \n2) Gu-feng Zhang\, Yi Li\, C. Wu\, The honeycomb lattice with multi-orbital structure: topological and quantu m anomalous Hall insulators with large gaps \,Phys. Rev. B 90\, 075114 (201 4) .\n3) Wei-cheng Lee\, C. Wu\, and S. Das Sarma\, "F-wave pairing of cold atoms in optical lattices"\, Phys. Rev. A 82\, 053611 (2010).\n4) C. Wu\, "Orbital analogue of quantum anomalous Hall effect in $p$-band systems"\, P hys. Rev. Lett. 101\, 186807 (2008).\n5) C. Wu\, "Orbital orderings and fru strations of p-band systems in optical lattices"\, Phys. Rev. Lett. 100\, 2 00406 (2008).\n6) C. Wu\, Doron Bergman\, Leon Balents\, and S. Das Sarma\, "Flat bands and Wigner crystallization in the honeycomb optical lattice"\, Phys. Rev. Lett. 99\, 70401 (2008).\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Xiao Li\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170310T222334Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170126T173000Z DTEND:20170126T183000Z DTSTAMP:20260828T094430Z UID:d7d9o7ut0pjel6rg5h5amqsu0k@google.com CREATED:20170124T162823Z DESCRIPTION:Spatio-Temporal Optical Vortices (PHYS 798E)\n\nSpeaker: Prof. Howard Milchberg\, Physics\, IREAP and ECE\, U of Md.\n\nAbstract: When an optical pulse propagating through a nonlinear medium exceeds a certain thre shold power\, it can focus itself and collapse\, in theory\, to a singulari ty. In practice\, several physical mechanisms mitigate or arrest the catast rophic collapse and the pulse continues propagation as a filamentary struct ure. This scenario has played out in many nonlinear optics systems over dec ades: among them are air filamentation\, relativistic self-focusing in plas mas\, laser-material processing\, and nonlinear generation of broadband lig ht. Recently\, we showed that self-focusing collapse and collapse arrest is universally accompanied by the generation of robust topological structures : spatio-temporal optical vortices (STOVs). I’ll describe our experiments and simulations leading to this result.\n\n \nBio: Professor Howard Milchb erg received his undergraduate degree in Engineering Physics from McMaster University. He held a National Science and Engineering Research Council of Canada Fellowship at Princeton University\, where he completed his Ph.D. in Astrophysical Sciences in 1985. His dissertation was on one of the first t wo soft x-ray lasers experimentally demonstrated. Milchberg then joined AT& T Bell Laboratories as a postdoc\, where he performed among the first exper iments in high intensity femtosecond laser-plasma interactions. In 1988 Mil chberg joined the University of Maryland\, where he received a NSF Presiden tial Young Investigator Award. He is a Professor in Departments of Physics and Electrical and Computer Engineering. Milchberg is a Distinguished Schol ar-Teacher at Maryland (2005) and a recipient of the Senior Faculty Outstan ding Research Award (2016) from the Clark School of Engineering. In 2005\, he was awarded the APS Division of Plasma Physics (DPP) Award for Excellenc e in Plasma Physics Research. He is a Fellow of the APS and the OSA. Three of his graduate students\, most recently in 2012\, have won the APS-DPP Ma rshall Rosenbluth Award for their dissertation research.\n\n LAST-MODIFIED:20170213T154226Z LOCATION:John S. Toll Physics Blg. (room PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170130T210000Z DTEND:20170130T220000Z DTSTAMP:20260828T094430Z UID:a4s7jtkm715sfpds45blev51m0@google.com CREATED:20170123T201207Z DESCRIPTION:Speaker Name: Dr. Adriana Dawes\n\nSpeaker Institution : Ohio S tate University\n\nTitle : Pushing and pulling to properly position centros omes in polarized cells\n\nAbstract : Asymmetric cell division\, where daug hter cells inherit unequal amounts of specific factors\, is critical for de velopment and cell fate specification. Asymmetric cell division occurs in p olarized cells as a result of positioning the centrosomes along the polarit y axis. Using an individual-based stochastic model of microtubule dynamics and experiments in the early C. elegans embryo\, we explore potential sourc es of cortical force generation and demonstrate the need for both cortical and centrosomal asymmetries for recapitulating the in vivo dynamics and pro per positioning of the centrosomes. \n LAST-MODIFIED:20170123T201321Z LOCATION:CHEM 0112 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171208T211500Z DTEND:20171208T221500Z DTSTAMP:20260828T094430Z UID:66vm6351q6oshgg0b9o7d1av7u@google.com CREATED:20171201T140314Z DESCRIPTION:Speaker: Zhexuan Gong\n\nAffiliation: JQI/QuICS and Colorado Sc hool of Mines\n\nTitle: Many-body physics in long-range interacting quantum systems\n\nAbstract: Condensed matter systems often have short-range inter actions\, and this locality of interactions has profound effects on the pro perties of both ground states and states created out of equilibrium. Howeve r\, in numerous systems of current interest\, ranging from frustrated magne ts\, spin glasses\, and low-dimensional materials to various atomic\, molec ular\, and optical systems\, long-range interactions are ubiquitous and can lead to qualitatively new physics. In this talk\, I will review recent the oretical and experimental work done at JQI on how long-range interactions c an give rise to novel dynamical behaviors\, exotic quantum phases\, and sig nificant speedups in quantum information processing. A number of challengin g and important open questions will be given in the end. \n\n*Snacks and d rinks will be served at 4 pm* LAST-MODIFIED:20171201T140314Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180912T150000Z DTEND:20180912T160000Z DTSTAMP:20260828T094430Z UID:18ffqpcaht8jms1g24e16lpaou@google.com CREATED:20180904T140301Z DESCRIPTION:\nTitle: Ge-78 and the Search for Tom Brady's Football in the N uclear Structure World\nSpeaker: Anne Forney\, Chem/BioChem\, UMCP\n\nAbstr act: Due to the lack of a direct equation for the nuclear force law\, it ha s been necessary to use models to describe the nucleus. One such class is g eometric models. The simplest geometric form is a sphere\, with two axes of symmetry\, such as a golf ball or basketball. When only one axis of symmet ry remains the nucleus is described as prolate (football) or oblate (hockey puck). A nucleus with zero axes of symmetry can be ascribed to the conditi on which would happen to a football when the air has been let out.\n\nThe e xcited energy states of nuclei provide insight to the variety of nuclear sh apes present. Results were recently published on the 78Ge nucleus (Forney e t al. PRL 120\, 212501 (2018)) with a sequence of states\, best described a s having no axis of symmetry.\n\nIn this talk\, I will present key points i n the history of nuclear chemistry as it relates to nuclear shape. I will d escribe the effect of different energy patterns in the nucleus and how thos e patterns infer the shape of the nucleus. Powerful detector arrays such as Gammasphere (popularized by the 2003 Hulk film) are used to detect de-exci tations of nuclei following multi-nucleon transfer reactions. 78Ge\, produc ed in this fashion\, will be shown to have a different behavior through com parison of the results to various nuclear model calculations. LAST-MODIFIED:20180905T193717Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180924T203000Z DTEND:20180924T213000Z DTSTAMP:20260828T094430Z UID:59i6ejb77737c7tv4232j14fho@google.com CREATED:20180831T182554Z DESCRIPTION:Title: Dynamic Measurement of Electron Acceleration and Coronal Magnetic Fields in Solar Flares

Speaker: Prof. Dale R. Gary\, \;Department of Physics New Jersey Institute of Technology

Abstract: Solar flares are the re sult of explosive release of stored magnetic energy in the Sun's corona. Th e detailed physical processes that underlie the rapid conversion of such en ergy to other forms\, particularly the acceleration of electrons and ions t o relativistic energies\, remain mysterious\, partly because direct measure ments of the coronal magnetic field and the spatial and energy distribution of the particles have been difficult or impossible. One emission mechanism that is sensitive to the coronal magnetic field in the flaring region is r adio emission\, but until now the instrument capabilities needed to exploit that sensitivity have not been available. However\, within the past year t his has changed with the completion of a new\, solar dedicated radio interf erometer array\, the Expanded Owens Valley Solar Array (EOVSA)\, that has the required combina tion of spatial\, spectral\, and temporal resolution to make these breakthr ough measurements. In this talk\, I illustrate the new capabilities and the ir implications using observations of a showcase solar limb flare that occu rred on 2017 September 10. This event is a textbook example of the "standar d solar model" eruptive event\, with a clearly visible reconnecting current sheet connecting an erupting flux rope with a growing arcade of newly form ed "post-flare" loops. The comparison of microwave diagnostics of high-ener gy electrons with those from hard X-rays seen by the RHESSI spacecraft show that \, while they are fully consistent\, the microwaves reveal that the coronal volume containing high-energy particles is much larger and more widespread than would have been deduced from hard X-rays alone. Even more important\, however\, are the quantitative measurements of the spatially and temporall y resolved magnetic field strength\, which\, if our interpretation is corre ct\, directly reveal the conversion of magnetic energy over a large volume into high-energy charged particles.and turbulent plasma. The new observatio ns present both a challenge and an opportunity for further theoretical unde rstanding of the processes occurring in solar flares.

Notes: Coffee\ , Tea and Snacks available from 4:15 to 4:30 \; LAST-MODIFIED:20180911T041957Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180402T173000Z DTEND:20180402T183000Z DTSTAMP:20260828T094430Z UID:3lsr0ku8bvo89vurcfit6v94u4@google.com CREATED:20180301T201414Z DESCRIPTION:Speaker: Itamar Kimchi (MIT)

Title: \;Data collapse and scaling theory of frustration and disorder in quantum magnets

Ab stract: \;Several longstanding problems in quantum magnetism concern quenched disorder. I wil l analyze the role of random exchange energies in spin-1/2 magnets where ma gnetic frustration promotes the formation of entangled valence bonds. This includes a theory for 2d valence-bond solids subject to weak bond randomnes s as well as extensions to stronger disorder regimes where we make connecti ons with quantum spin liquids. In both cases we find that bond-randomness d isorder nucleates topological defects that carry spin-1/2 moments\, thereby renormalizing the lattice into a strongly random spin network with interes ting low-energy excitations. Motivated by these results we conjecture Lieb- Schultz-Mattis-like restrictions for disordered magnets with spin-1/2 per s tatistical unit cell. I will also discuss predictions for various experimen tal observables. Most strikingly\, heat capacity measurements on the magnet s \;H3LiIr2O 6 \, \;LiZn< span style="font-size: 9.81333px\;">2Mo3O8 \, \;ZnCu 3(OH)6C l2  \;and \;1T-TaS2 < span style="color: rgb(34\, 34\, 34)\; font-family: sans-serif\; font-size: 12.8px\; background-color: rgb(255\, 255\, 255)\;"> \;-- all described by magnetic frustration and quenched disorder but with no other common rel ation -- nevertheless show apparently universal one-parameter data collapse of C[H\,T] in a magnetic field. I will argue that this data collapse and i ts particular scaling function can be understood in terms of the theory\, a s an emergent network of long range valence bonds at low energies.
Host: Victor Galitski

http://www.physics.umd.edu/cmtc/seminars.html


 LAST-MODIFIED:20180327T155211Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170920T200000Z DTEND:20170920T210000Z DTSTAMP:20260828T094430Z UID:2fggigeee8hmdee55amne845pq@google.com CREATED:20170915T140405Z DESCRIPTION:Speaker: Sarah Eno\nTitle: New Physics Searches at CMS and ATLA S\n\nsmegonig@umd.edu\n LAST-MODIFIED:20170915T140405Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170224T171500Z DTEND:20170224T181500Z DTSTAMP:20260828T094430Z UID:s6svb22tl2ju9jnj1g7otc2e00@google.com CREATED:20170215T151232Z DESCRIPTION:Speaker Name: Mehdi Kargarian\n\nSpeaker Institution: CMTC\n\nT itle: Time-Reversal-Symmetryt-Breaking Superconductivity in Epitaxial Bismu th/Nickel Bilayers\n\nAbstract: Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found\, so far\, only in a handful o f 3D crystals with bulk inversion symmetry. Here we report an observation o f spontaneous TRS breaking in a 2D superconducting system without inversion symmetry: the epitaxial bilayer films of bismuth and nickel. The evidence comes from the onset of the polar Kerr effect at the superconducting transi tion in the absence of an external magnetic field\, detected by the ultrase nsitive loop-less fiber-optic Sagnac interferometer. Because of strong spin -orbit interaction and lack of inversion symmetry in a Bi/Ni bilayer\, supe rconducting pairing cannot be classified as singlet or triplet. We propose a theoretical model where magnetic fluctuations in Ni induce superconductin g pairing of the d_{xy} +- id_{x^2-y^2} orbital symmetry between the electr ons in Bi. This order parameter spontaneously breaks the TRS and has a non- zero phase winding number around the Fermi surface\, thus making Bi/Ni a ra re example of a 2D topological superconductor.\n\nRef: Xinxin Gong\, Mehdi Kargarian\, Alex Stern\, Di Yue\, Hexin Zhou\, Xiaofeng Jin\, Victor M. Gal itski\, Victor M. Yakovenko\, Jing Xia (Science Advances 2017) arXiv: 1609. 08538 \n LAST-MODIFIED:20170218T154358Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Lunch Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180308T160000Z DTEND:20180308T170000Z DTSTAMP:20260828T094430Z UID:2ifs0tlt90oou25uucv4115iin@google.com CREATED:20180219T135822Z DESCRIPTION:

speaker: \;

Kenji Ohmori

institution:  \;

Institute for Molecular Science\, National Institutes of Nat ural Sciences


Many-body correlations govern a variety of impor tant quantum phenomena such as theemergence of superconductivity and magnet ism in condensed matter. Understanding quantummany-body systems is thus one of the central goals of modern sciences. Here we demonstrate a new pathway towards this goal by generating a strongly correlated ultracold Rydberg ga s with a broadband picosecond laser pulse. We have applied our ultrafast an d ultrahigh-precision coherent control [1-8] to this strongly correlated Ry dberg gas\, and have successfully observed and controlled its many-body ele ctron dynamics on the attosecond timescale [9]. Our approach will offer a v ersatile platform to observe and manipulate nonequilibrium dynamics of stro ngly correlated quantum many-body systems on the ultrafast timescale.

References
[1] K. Ohmori et. al.\, Phys. Rev. Lett. 91\, 243003 (2003).
[2] H. Katsuki and K. Ohmori et. al.\, Science 311\, 1589 (2006).
[3 ] K. Ohmori et. al.\, Phys. Rev. Lett. 96\, 093002 (2006).
[4] H. Katsuk i and K. Ohmori et. al.\, Phys. Rev. Lett. 102\, 103602 (2009).
[5] K. H osaka and K. Ohmori et al.\, Phys. Rev. Lett. 104\, 180501 (2010)
 \ ;  \;(Highlighted by Nature 465\, 138 (2010)\; Physics 3\, 38 (2010)).< br>[6] H. Goto and K. Ohmori et al.\, Nature Physics 7\, 383 (2011)
&nbs p\;  \;(Highlighted by Nature Physics 7\, 373 (2011)\; Nature Photonics 5\, 382 (2011)).
[7] H. Katsuki and K. Ohmori et al.\, Nature Commun. 4 \, 2801 (2013).
[8] H. Katsuki and K. Ohmori et al.\, Phys. Rev. B 92\, 094511 (2015).
[9] N. Takei\, C. Sommer\, C. Genes\, G. Pupillo\, H. Got o\, K. Koyasu\, H.Chiba\,M. Weidemüller\, and K. Ohmori\, Nature Commun. 7\ , 13449 (2016)

 \; (Highlighted by Science 354\, 1388 (2016)\; IO P PhyscisWorld.com (2016)).

Hosts: Chris Monroe and Alexey Gorshkov LAST-MODIFIED:20180219T135917Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Ultrafast many-body electron dynamics in a strongly correlated ultr acold Rydberg gas TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171024T171500Z DTEND:20171024T181500Z DTSTAMP:20260828T094430Z UID:7krsba5cc1b4flgarico50j27b@google.com CREATED:20170912T134539Z DESCRIPTION:Speaker: Dr. Ruhong Zhou\, IBM Watson Research Center\n\nTitle: Large Scale Molecular Simulation of Nanoparticle-Biomolecule Interactions\ n\nAbstract: Nanoscale particles have become promising materials in various biomedical applications\, however\, in order to stimulate and facilitate t hese applications\, there is an urgent need for a better understanding of t heir biological effects and underlying physics. In this talk\, I will discu ss some of our recent works\, mostly molecular modelling\, at bio-nano inte rface and their underlying molecular mechanism. We show that carbon-based n anoparticles (carbon nanotubes\, graphene nanosheets\, and fullerenes) can interact and disrupt the structures and functions of many important protein s. The hydrophobic interactions between the carbon nanotubes and hydrophobi c residues\, particularly aromatic residues through the so-called pi-pi sta cking interactions\, are found to play key roles. Meanwhile\, metallofuller enol Gd@C82(OH)22 is found to inhibit tumour growth and metastases with bot h experimental and theoretical approaches. Graphene and graphene oxide (GO) nanosheets show strong destructive interactions to E. coli cell membranes (antibacterial activity) with unique molecular mechanisms\, while PEGylated GO nanosheets stimulate potent cytokine responses in peritoneal macrophage s. On the other hand\, GO nanosheets also show a strong supportive role in enzyme immobilisation such as lipases through lid opening. In particular\, the lid opening is assisted by lipase's sophisticated interaction with GO\, which allows the adsorbed lipase to enhance its enzyme activity. The lipas e enzymatic activity can be further optimized through fine tuning of the GO surface hydrophobicity. These findings might provide a better understandin g the underlying physics at bio-nano interface\, with implications in futur e de novo nanomedicine design. LAST-MODIFIED:20171018T132851Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161114T200000Z DTEND:20161114T213000Z DTSTAMP:20260828T094430Z UID:fm00r06lrdjgdl8fmptq979sos@google.com CREATED:20161027T130943Z DESCRIPTION:Speaker: Jnan Maharana\n\nSpeaker Institution: Institute of Phy sics\, Bhubaneswar\n\nTitle: T-Duality and Scattering of Stringy States\n \ nAbstract: First I shall recall some of the salient features of T-duality s ymmetry for\nclosed bosonic string compactified on a torus. The vertex oper ators for\nmassless states such as graviton\, antisymmetric tensor and the moduli\narising from compactification are constructed. The vertex oprators of the\nmoduli are cast in O(d)XO(d) invariant form adopting the arguments of\nKLT. The invariance properties of S-matrix for the moduli are derived a nd\napplications of T-duality to scattering processes are discussed. LAST-MODIFIED:20161027T130943Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - T-Duality and Scattering of Stringy States TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170920T183000Z DTEND:20170920T200000Z DTSTAMP:20260828T094430Z UID:7v15qkoqrjje9mikgcq5ud8k6d@google.com CREATED:20170912T132120Z DESCRIPTION:**Event start time has been updated to 2:30pm**\n\nSpeaker: Hor acio Casini\n\nSpeaker Institution: Centro Atómico Bariloche\, Argentina\n\ nTitle: Markovian property of vacuum state and the a-theorem\n\nAbstract: T he vacuum state reduced to a region of the space gives a density matrix whi ch can be written in a thermal-like form. In this "thermal" density matrix the role of the Hamiltonian is played by the so called entanglement or mod ular Hamiltonian. Surprisingly\, this modular Hamiltonian has a local unive rsal expression in terms of the stress tensor for a large class of regions with boundary on a null plane. We will show that this property\, together w ith strong subadditivity of entanglement entropy\, give place to an entropi c version of the a-theorem about irreversibility of the renormalization gro up in d=4. LAST-MODIFIED:20170918T130953Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171018T150000Z DTEND:20171018T160000Z DTSTAMP:20260828T094430Z UID:04f18bggcmsaqnoq62lhj3nlk3@google.com CREATED:20171010T155840Z DESCRIPTION:Speaker: Prof. Ralph V. Chamberlin\, Department of Physics\, Ar izona State University\n\nTitle: Equilibrium fluctuations\, heterogeneous r esponse\, and 1/f noise from local transient effects in thermodynamics\n\nA bstract:\nSome remarkably universal empirical formulas are used to characte rize the primary response of complex systems. Stretched-exponential relaxat ion has been used since 1854 for time-dependent response\, non-classical cr itical scaling has been used since 1893 for temperature-dependent behavior\ , and 1/f noise has been used since 1925 for frequency-dependent fluctuatio ns. I will describe a common physical foundation for all these formulas. Th e ideas are based on “nanothermodynamics\,” where nanometer-sized systems c ouple to a local thermal bath from the surrounding ensemble of similarly sm all systems. The mechanism can be attributed to strict adherence to the law s of thermodynamics: non-extensive energy is conserved by including Hill’s subdivision potential\, and maximum entropy is maintained by transferring i nformation to the surrounding bath. Alternatively the mechanism may involve the statistics of indistinguishable particles for equivalent states. I wil l emphasize how using these ideas\, standard theories and simulations yield the empirical formulas\, plus deviations from the formulas that often matc h measured behavior. Finally\, I plan to present some recent results showin g that molecular dynamics simulations of several models exhibit anomalous f luctuations in the local energy. Specifically\, small systems containing 1- 1000 atoms inside much larger simulations have energy fluctuations that dif fer significantly from a fluctuation-dissipation relation\, sometimes by an order of magnitude or more.\n LAST-MODIFIED:20171010T155840Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170405T150000Z DTEND:20170405T160000Z DTSTAMP:20260828T094430Z UID:q2qish47k8s8cjruqm990moua4@google.com CREATED:20170330T174406Z DESCRIPTION:Speaker: Antonio Acin\n\nSpeaker Affiliation: Institute for Pho tonic Sciences\, Barcelona\n\nTitle: Detecting entanglement and non-local c orrelations of many-body quantum states\n\nAbstract: Quantum correlations a re fundamental for quantum information protocols and for our understanding of many-body quantum physics. The detection of these correlations in these systems is challenging because it requires the estimation of an exponential ly growing amount of parameters. We present methods to alleviate this probl em and discuss their application to physically relevant quantum states. LAST-MODIFIED:20170330T174406Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180305T210000Z DTEND:20180305T223000Z DTSTAMP:20260828T094430Z UID:4r1k1p9ng8e0l13ogrfj76phv4@google.com CREATED:20180301T144518Z DESCRIPTION:\nSpeaker: Michael Geller\n\nSpeaker Institution: University of Maryland\n\nTitle: Dark quarkonium formation in the early universe\n\nAbst ract: The relic abundance of heavy stable particles charged under a confini ng gauge group can be depleted by a second stage of annihilations near the confinement temperature. This proceeds via the formation of quarkonia-like states\, in which the heavy pair subsequently annihilates. The size of the quarkonium formation cross section was the subject of some debate. We estim ate this cross section in a simple toy model. The dominant process can be v iewed as a rearrangement of the heavy and light quarks\, leading to a geome tric cross section of hadronic size. In contrast\, processes in which only the heavy constituents are involved lead to mass-suppressed cross sections. These results apply to any scenario with bound states of sizes much larger than their inverse mass\, such as U(1) models with charged particles of di fferent masses\, and can be used to construct ultra-heavy dark-matter model s with masses above the naive unitarity bound. They are also relevant for t he cosmology of any stable colored relic. LAST-MODIFIED:20180301T144518Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170417T203000Z DTEND:20170417T213000Z DTSTAMP:20260828T094430Z UID:e15kstql9e4fbceu5tcoci1eg4@google.com CREATED:20170412T211219Z DESCRIPTION:Speaker Name: Dennis Papadopoulos \n\nSpeaker Institution : Uni versity of Maryland\n\nTitle : On the Physics of Upper Hybrid Turbulence\n\ nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : See https://space.um d.edu/seminars/showAbstract/0417171630 LAST-MODIFIED:20170412T213101Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180716T170000Z DTEND:20180716T183000Z DTSTAMP:20260828T094430Z UID:2k6q6hpjifmivta1mr93o61n1g@google.com CREATED:20180709T132543Z DESCRIPTION:\nSpeaker: Nobuchika Okada\n\nSpeaker Institution: University o f Alabama\n\nTitle: $SU(5) \\times U(1)_X$ Grand Unification with Minimal S eesaw and Z′-portal Dark Matter\n\nAbstract: We propose a grand unified SU( 5)$\\times$U(1)$_X$ model\, where the standard SU(5) grand unified theory i s supplemented by minimal seesaw and a right-handed neutrino dark matter wi th an introduction of a global $Z_2$-symmetry. In the presence of three rig ht-handed neutrinos (RHNs)\, the model is free from all gauge and mixed-gra vitational anomalies. The SU(5) symmetry is broken into the Standard Model (SM) gauge group at $M_{\\rm GUT} \\simeq 4 \\times 10^{16}$ GeV in the sta ndard manner\, while the $U(1)_X$ symmetry \nbreaking occurs at the TeV sca le\, which generates the TeV-scale mass of the $U(1)_X$ gauge boson (Z′ bos on) and the three Majorana RHNs. A unique $Z_2$-odd RHN is stable and serve s as the dark matter (DM) in the present Universe\, while the remaining tw o RHNs work to generate the SM neutrino masses through the minimal seesaw. We investigate the Z′-portal RHN DM scenario in this model context\, and fi nd that the constraints from the DM relic \nabundance and the search resul ts for a Z′ boson resonance at the Large Hadron Collider (LHC) are compleme ntary to narrow down the allowed parameter region\, which will be fully cov ered by the future LHC experiments (for the Z′ boson mass < 5 TeV). We also briefly discuss the successful implementation of Baryogenesis and cosmolog ical inflation scenarios in the present model. LAST-MODIFIED:20180709T132549Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171127T200000Z DTEND:20171127T213000Z DTSTAMP:20260828T094430Z UID:50t90ppatgonapsqv1eufiuh4i@google.com CREATED:20171115T194401Z DESCRIPTION:Speaker: Andreas Trautner\n\nSpeaker Institution: Universität B onn\n\nTitle: CP violation caused by another symmetry\n \nAbstract: Underst anding the origin of CP violation offers a new starting point to address th e Standard Model flavor and strong CP puzzles. \nGroup theoretically\, the physical CP transformation of the SM is a special outer automorphism ("symm etry of symmetry") of the theory\nand I will explain what that means in det ail.\nEquipped with this\, we can understand that beyond the Standard Model \, there can be other outer automorphisms beyond the usual C\,P or T transf ormations.\nOn the other hand\, certain classes of symmetries do preclude t he existence of CP transformations altogether in which\ncase CP is violated by calculable ("geometrical") phases. I will explain this based on two exp licit example models: \nIn a special three Higgs doublet model the presence of outer automorphisms beyond CP allows for a super simple calculation of VEVs\, a reduction of \nthe size of the parameter space by a factor of 24\, anticipating the boundaries of the RGE flow and most interestingly\,\nthe prediction of quantized CP violating phases. A second explicit example is a "Scalar-QCD" type of model in which the SU(3) gauge group is spontaneously broken to the small discrete subgroup T7. \nIn this case CP violation orig inates with quantized phases while the theta angle is protected at 0. LAST-MODIFIED:20171115T194401Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180425T190000Z DTEND:20180425T200000Z DTSTAMP:20260828T094430Z UID:4452d0mj730ohmn68fup3sbjat@google.com CREATED:20180420T185526Z DESCRIPTION:

Speaker: \; \; Prof. Karl Berggren

Affiliation: Massachusetts Institute of Technology< /p>

Title: \;Supercondu cting Nanowires: from Photodetection\, to Power-Efficient Memory\, to Deep Learning"

Abstract:

In this presentation\, I will describe how a relatively simple el ectronic device---a 100-nm-width superconducting nanowire patterned in a th in film---can be used for a rich array of purposes ranging from single-phot on detection to complex digital electronics. Most importantly\, the devices do not rely on Josephson junctions to operate\, rather they use principles closer to that of the cryotron\, hearkening back to the early days of supe rconductivity research in this country. Recently\, with the support of IARP A\, we have developed a new type of superconducting memory based on this de vice. \; Extending on that basic concept\, we now believe that these de vices could have application to deep learning by performing large efficient matrix multiplication events.

Biography:< /p>

Prof. Berggren is Professor of Electrical Engineering at Massac husetts Institute of Technology\, Department of Electrical Engineering and Computer Science\, where he heads the Quantum Nanostructures and Nanofabric ation Group. He is also Director of the Nanostructures Laboratory in the Re search Laboratory of Electronics and is a core faculty member in the Micros ystems Technology Laboratory (MTL). From December of 1996 to September of 2 003\, Prof. Berggren served as a staff member at MIT Lincoln Laboratory in Lexington\, Massachusetts\, and from 2010 to 2011\, was on sabbatical at th e Technical University of Delft in the Netherlands. His current research fo cuses on methods of nanofabrication\, especially applied to superconductive circuits\, single-photon detectors for quantum applications\, and electron -optical systems. His thesis work focused on nanolithographic methods using neutral atoms.

LAST-MODIFIED:20180420T185526Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170202T173000Z DTEND:20170202T183000Z DTSTAMP:20260828T094430Z UID:dq2gfqfnh2i39kf9m81jvffatc@google.com CREATED:20170131T162644Z DESCRIPTION: Laser Acceleration of Ions in Plasmas (Phys 798E) \nDr. Antonio Ting\, IREAP\, U of Md.\n\nAbstract: Accelerating ion s from rest in a plasma requires extra\nconsiderations because of their hea vy mass. Low phase velocity fields or\nquasi-electrostatic fields are often necessary\, either by operating above\nor near the critical density or by applying other slow wave generating\nmechanisms. Solid targets have been a favorite and have generated many\ngood results. High density gas targets have also been reported to produce\nenergetic ions. Recent experimental res ults will be reviewed and discussed.\n\nBio: Dr. Antonio C. Ting received h is Ph.D. degree in physics from the\nUniversity of Maryland in 1984. He co nducts research in intense laser\ninteractions with air\, plasmas\, and ele ctron beams\, with applications in\nstandoff detections\, electronic counte rmeasures\, directed energy research\,\nlaser driven accelerators\, and adv anced radiation sources. He is a Fellow\nof the American Physical Society. He has published 129 refereed articles\,\nand he holds 12 U.S. invention patents.\n\n\n-- LAST-MODIFIED:20170213T154143Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171020T193000Z DTEND:20171020T203000Z DTSTAMP:20260828T094430Z UID:1een5l03qea6qm0ga4u6fsu4tb@google.com CREATED:20171010T153847Z DESCRIPTION:Title : Quasilinear velocity diffusion in a tokamak\nSpeaker Na me: Dr. Jungypo Lee\nSpeaker Institution : MIT\nAbstract : RF waves are inj ected in a tokamak to heat plasmas or generate a plasma current. Addition t o the main purposes\, it can be a good tool to control some MHD and transpo rt phenomena in the fusion reactor. In this talk\, I will present the recen tly developed theory of the quasilinear velocity diffusion due to the RF wa ves. The quasilinear diffusion is used to describe the RF wave model in a k inetic theory. This talk has two parts. In the first part\, I will\nmention the modification of the Kennel Engelmann diffusion coefficients for the to roidal geometry. In the second part\, the change of the radial electric fie ld and ion toroidal rotation due to the quasilinear diffusion will be explo red\, as an application of the quasilinear theory.\n\n\nswisdak@umd.edu LAST-MODIFIED:20171010T153847Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161209T160000Z DTEND:20161209T200000Z DTSTAMP:20260828T094430Z UID:d16hs1a887qimlgju4ji9goufk@google.com CREATED:20160906T221916Z DESCRIPTION:December 9 (Friday)\nMajorana Fermions\n11:00 AMSetiawan\, "Con ductance spectroscopy of nontopological--topological superconductor junctio ns"\n11:45 AMChunxiao Liu\, "Realistic simulations of Majorana nanowire sys tems"\n12:30 Break\nParafermions & Spin Liquids\n1:30 PMYahya Alavirad\, "Z 3 parafermions without superconducting backscattering from the fractional quantum Hall state"\n2:15 PMJunhyun Lee\, "Electronic quasiparticles in th e quantum dimer model: Density matrix renormalization group results"\n LAST-MODIFIED:20161201T163653Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Fall CMTC Symposium -- Day 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160608T150000Z DTEND:20160608T160000Z DTSTAMP:20260828T094430Z UID:6h4drqq401cs35oh711f8f66v8@google.com CREATED:20160513T141312Z DESCRIPTION:Speaker: Henry Yuen\n\nSpeaker Affiliation: MIT\n\nTitle: Paral lel repetition theorems for all entangled games\n\nAbstract: In complexity theory and cryptography\, parallel repetition is a natural operation to red uce the error of a game or protocol without increasing the number of rounds . Raz's parallel repetition theorem is a cornerstone result in complexity t heory showing that the value of two-player one round game\, when repeated i n parallel\, decreases exponentially fast with the number of repetitions. A lthough the statement is intuitive\, its analysis requires sophisticated te chniques in information theory. \n\nA major open question in quantum comple xity theory concerns whether an analogue of Raz's theorem holds when the pl ayers use quantum entanglement. Until recently\, quantum parallel repetitio n theorems have only been established for special classes of games\, but no ne were applicable to all games. In this talk\, I'll discuss two new result s on quantum parallel repetition theorems that apply to all games\, includ ing the first result that shows the entangled value of a parallel repeated game must converge to 0 for all games whose entangled value is less than 1. \n\nJoint work with Mohammad Bavarian and Thomas Vidick.\n LAST-MODIFIED:20160523T132707Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170919T160000 DTEND;TZID=America/New_York:20170919T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20170919T160000 CREATED:20170809T180226Z DESCRIPTION:Speaker: Min Ouyang\, University of Maryland\n\nTitle: New Inte rface between Quantum Optics and Nanoscience: the Bottom-Up Approach and Ap plications\n\nAbstract: In this talk I will present a few recent advances f rom my group\, centering on a new interface between ultrafast quantum optic s and nanoscience through bottom-up materials design. I will particularly f ocus on development of emerging colloidal hybrid nanostructures that can al low desirable integration of multiple functionalities in one single nanosca le unit to create novel synergistic interactions. By combining ultrafast op tical spectroscopy with this new materials advance\, precise control of qua ntum optical interactions can thus be achieved at the nanoscale. This has f urther led to all optical spin manipulation and spin echo by light-matter i nteraction in well-designed hybrid semiconductor quantum structures\, which is crucial for understanding many body spin physics and developing novel n anoscale quantum devices. Potential applications of such a bottom-up approa ch will also be described. \n \n\n LAST-MODIFIED:20170821T130028Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180510T200000Z DTEND:20180510T213000Z DTSTAMP:20260828T094430Z UID:2v2sp8utp182k6lm6o4a6gsfmf@google.com CREATED:20180420T204804Z DESCRIPTION:\nSpeaker: Ilias Cholis\n\nSpeaker Institution: Johns Hopkins U niversity\n\nTitle: Analyzing the Gamma-Ray sky with Wavelets\n\nAbstract: The study of the Fermi gamma-ray sky has revealed several new diffuse emiss ion components\, including the Fermi Bubbles and the Galactic center excess . I will discuss how we analyze the gamma-ray sky using wavelets. Focusing on the inner 60◦ of the sky\, we have identified the Fermi Bubbles\, findin g that they are clearly diffuse in their nature. Moreover\, we have clearly detected the southern cocoon inside the Southern Bubble and also a norther n cocoon that is ∼30% dimmer than the southern one. I will also discuss the characterization of the Galactic center excess. At latitudes |b| ≤ 5◦\, th ere is indication for power in small angular scales that could be the resul t of point-source contributions\, but for |b| ≥ 5◦ that emission is dominan tly diffuse in its nature. Our results give proof of the smooth transition between the Galactic center excess and the Fermi Bubbles. Furthermore\, the Galactic center excess has an aspect ratio of 1.+0.2-0.3\, being more elon gated along the disk at 1-5 GeV and elongated perpendicular to the disk for E ≥ 10 GeV. Also\, at low latitudes it is off-center by 4◦ − 6◦in negative l with this offset reducing to 1◦ after masking the Galactic disk. I will finally discuss how these findings affect our understanding of the gamma-ra y physics in the Inner Galaxy. LAST-MODIFIED:20180502T185628Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180215T190000Z DTEND:20180215T203000Z DTSTAMP:20260828T094430Z UID:499f9qojnm6pcttkkiduv6h6b0@google.com CREATED:20180209T220108Z DESCRIPTION:Speaker Name: James Williams\n\nSpeaker Institution: UMD\n\nT itle: Using Josephson Junctions to Probe Quantum Materials\n\nAbstract: In this talk I’ll be presenting some of our group’s recent results on using Jo sephson junctions (JJs) to look for exotic excitations in quantum materials . Specifically\, we will present data on junctions made from Pb_xSn_(1-x)Te -- a topological crystalline insulator -- where deviations from convention al JJs becomes most evident under microwave radiation [1]. Finally\, I will report on progress made in dynamically creating JJs in NbSe2.\n\n[1] R. A. Snyder\, C. J. Trimble\, C. C. Rong\, P. A. Folkes\, P. J. Taylor\, J. R. Williams\, "Josephson Junctions with Weak Links of Topological Crystalline Insulators"\, arXiv:1710.06077 (2017). LAST-MODIFIED:20180212T162152Z LOCATION:Rm 1201\, John S. Toll Bldg.\, Refreshments in room 1117 of the To ll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: James Williams\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171211T200000Z DTEND:20171211T213000Z DTSTAMP:20260828T094430Z UID:1lbf8hgg5ponnl51arko18ddmq@google.com CREATED:20171204T205650Z DESCRIPTION:Speaker: Ian Moult\n\nSpeaker Institution: Lawrence Berkeley Na tional Laboratory\n\nTitle: Resummed Photon Spectra for WIMP Annihilation\n \nAbstract: We construct an effective field theory (EFT) description of th e hard photon spectrum for heavy WIMP annihilation. This facilitates preci sion predictions relevant for line searches\, and allows the incorporation of non-trivial energy resolution effects. Our framework combines technique s from non-relativistic EFTs and soft-collinear effective theory (SCET)\, a s well as its multi-scale extensions that have been recently introduced for studying jet substructure. We derive a factorization formula that enables both the resummation of all large Sudakov double logarithms that appear in the perturbative spectrum\, and the inclusion of the Sommerfeld enhancemen t. Our final result reproduces both the exclusive and the inclusive limits\ , thereby providing a unifying description of these two previously consider ed approximations. We estimate the impact on experimental sensitivity\, foc using for concreteness on an SU(2) triplet fermion dark matter -- the pure wino -- where the strongest constraints are due to a search for lines from the Galactic center. We find significant corrections to the analysis based on the resummed exclusive calculation\, thereby highlighting the importanc e of including spectral photons when interpreting data from future indirect detection experiments. LAST-MODIFIED:20171204T205650Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180509T190000Z DTEND:20180509T200000Z DTSTAMP:20260828T094430Z UID:7humhu19rmohjkifqhp6fo35d1@google.com CREATED:20180504T140034Z DESCRIPTION:Speaker: Dr. Andrew J. Kerman\nAffiliation: MIT Lincoln Labora tory\n\nTitle: Quantum Error Suppression with Superconducting Qubits\n\nAbs tract:\nThe operational coherence of superconducting qubits in quantum info rmation processing applications has improved dramatically in recent years\, due to combination of improvements in materials\, fabrication processes\, qubit circuit design\, and modes of operation. However\, it now appears tha t substantial further progress will likely require as yet unknown advances that go beyond incremental engineering improvements. One possible exception to this is the use of passive quantum error suppression (QES)\, the best-k nown example of which is dynamical decoupling of noise from pulsed gate ope rations in quantum computing. In this talk\, I will focus on a different ki nd of QES in which encoded logical qubit states are protected (passively) f rom errors by adding chosen energy penalty terms to the system Hamiltonian such that physical error processes can only occur if the environment can su pply a large energy.\nI will describe two new kinds of superconducting circ uits which provide the key capabilities needed to realize this kind of QES. First\, a new type of superconducting flux qubit called the Josephson phas e-slip qubit\, which naturally emulates a zero-field vector magnetic moment \, and makes full anisotropic Heisenberg interactions between such moments possible\; and second\, a new type of coupling circuit which can produce st rong\, four-spin interactions between these vector moments. I will show ful l quantum simulations of the resulting logical qubits\, and briefly describ e how they can be used in the context of both quantum annealing and quantum computation. LAST-MODIFIED:20180504T140050Z LOCATION: LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180206T160000 DTEND;TZID=America/New_York:20180206T170000 RRULE:FREQ=WEEKLY;UNTIL=20180515T035959Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com CREATED:20180102T192312Z DESCRIPTION:Speaker Name:\n\nSpeaker Institution: \n\nTitle:\n\nAbstract: LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180326T110000 DTEND;TZID=America/New_York:20180326T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180326T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: \;Andrea Young

Affiliation: UC SB

Title: \;Fractional Chern insulators in van der Waals heterostructures

Abstract: \;I will describe the experimental observation of ‘fractional \;Chern \;insulators’ in van der Waals heterostructures created by combining atomically thin graphite and \; insulating \;hexagonal boron nitride. \; van der Waals heterostruct ures provide an ideal experimental platform for investigating the correlate d physics of \;Chern \;bands\, allowing superlattice potentials (engineered from the interference of the mismatched graphene and boron nitride lattices) to be combined with exceptionally low disorder and strong electronic interactions. I will show how to distinguis h the \;fractional \;Chern \;insulators—which featur e fractionally charged excitations--from the other gapped electronic phases in these devices including those that break lattice symmetries. \; Fin ally\, I will describe prospects for using \;fractional \;Chern \;insulators \;as a substrate for e ngineering intrinsic nonabelian ground states\, 'synthetic' nonabelian defe ct states\, and new quantum critical points. \;
LAST-MODIFIED:20180312T110724Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170516T150000Z DTEND:20170516T160000Z DTSTAMP:20260828T094430Z UID:v8516k030flh6tcdo5fbe8j9r8@google.com CREATED:20170508T135412Z DESCRIPTION:Speaker Name: Sudeshna Sinha\n\nSpeaker Institution: Indian Ins titute of Science Education and Research\n\nTitle : Dynamics of Rewired Net works\n\nAbstract: We will show how spatio-temporal chaos in networks with strongly chaotic nodal dynamics can be tamed by dynamically changing links. Specifically\, we will illustrate the results in examples ranging from neu ronal networks to disease spreading models. Further we will show how random links can prevent blow-ups in coupled nonlinear systems suffering from unb ounded growth. LAST-MODIFIED:20170508T135628Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Date Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180326T110000 DTEND;TZID=America/New_York:20180326T120000 RRULE:FREQ=WEEKLY;UNTIL=20180515T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20180514T110000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com CREATED:20180309T155255Z DESCRIPTION:Speaker:\n\nAffiliation: \n\nTitle: \n\nAbstract: LAST-MODIFIED:20180309T155255Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160422T161500Z DTEND:20160422T171500Z DTSTAMP:20260828T094430Z UID:4psqnvq7mnn1ondgvub2nfatp4@google.com CLASS:PUBLIC CREATED:20160414T164750Z DESCRIPTION:Speaker Name: Shuo Sun\n\nSpeaker Institution: JQI and IREAP\n\ nFree lunch served at 12:00)\n\nTitle: Nanophotonic quantum interface for a single quantum dot spin qubit\n\nAbstract: The spin of a single electron c onfined in a quantum dot is a promising matter qubit for quantum informatio n processing. This spin system possesses microsecond coherence time and all ows picosecond timescale control using optical pulses. It is also embedded in a host semiconductor substrate that can be directly patterned to form co mpact integrated nanophotonic devices for photonic interfaces.\n\nIn this t alk\, I will discuss our efforts to develop nanophotonic quantum interface for a single quantum dot spin qubit by strongly coupling the quantum dot to a photonic crystal cavity. I will firstly present a quantum switch between a quantum dot spin and a photon [1]. This switch realizes a transistor ope rating at the fundamental quantum limit\, where in picoseconds timescales a single photon flips the orientation of a spin and the spin flips the polar ization of the photon. This device could enable spin-photon entanglement [2 ]\, and thus plays an important role in integrated quantum networks involvi ng multiple solid-state spin qubits interconnected by flying photons. Next I will show cavity enhanced optical readout of a quantum dot spin [3]. This approach utilizes the spin-dependent cavity reflectivity to determine the spin state\, and is particularly suitable for qubits such as quantum dot sp ins that do not possess a good cycling transition for resonance fluorescenc e detection. I will conclude with a discussion of the future prospects of t his technology for developing chip-integrated quantum information systems.\ n\n[1] S. Sun et. al.\, Nature Nanotechnology advanced online publication ( 2016)\, doi:10.1038/nnano.2015.334.\n[2] S. Sun and E. Waks\, Physical Revi ew A 90\, 042322 (2014).\n[3] S. Sun and E. Waks\, arXiv:1602.04367 (2016). LAST-MODIFIED:20160419T202642Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160804T150000Z DTEND:20160804T160000Z DTSTAMP:20260828T094430Z UID:v7r3n30fbn8dm7dgfh5c8kh47c@google.com CLASS:PUBLIC CREATED:20160711T141112Z DESCRIPTION:Speaker Name: Sylvain Ravets\n\nSpeaker Institution: ETH Zurich \n\nTitle: Optical studies of a two-dimensional electron system in a cavit y: quantum Hall polaritons\n\nAbstract: Light-matter interaction has playe d a central role in understanding and engineering new states of matter. Rev ersible coupling of excitons and photons enabled groundbreaking results in condensation and superfluidity of nonequilibrium quasiparticles with a phot onic component. In this work\, we combine the physics of correlated many-bo dy states in a two-dimensional electron system with the methods of cavity q uantum electrodynamics. By coupling the cavity photon of an AlGaAs based DB R micro-cavity structure to optical inter-band excitations of a 20 nm GaAs quantum well we observe the emergence of novel many-body polariton modes. I n the presence of a magnetic field\, polaritons show distinct signatures of integer and fractional quantum Hall ground states. We use the strong coupl ing of the cavity mode to bound trion states of inter-Landau level transiti ons to perform the spectroscopy of many-body correlated states in the quant um Hall regime. These quantum Hall polaritons provide a direct way to study the spin-polarization of quantum Hall states by measuring the polarization dependent normal-mode splitting. Our technique is also well suited to stud y the compressibility of the electron system and constitutes a powerful met hod to complement transport spectroscopy with the advantages of a minimally invasive local probe.\n\nHost: Luis A. Orozco LAST-MODIFIED:20160727T195325Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161102T200000Z DTEND:20161102T210000Z DTSTAMP:20260828T094430Z UID:35lf2mqecq698jthije55v47rc@google.com CREATED:20161028T182652Z DESCRIPTION:Speaker Name: Lesya Shchutska\n\nSpeaker Institution : Universi ty of Florida\n\nTitle : "SUSY/BSM after the LHC Restart: What's Next?"\n\n Abstract : In run 2 LHC has already delivered impressive amounts of data an d continues to push the limits. Sll these data just prove the triumph of th e Standard Model so far. After the first excitements and (futile)hopes for an immediate new physics discovery\, the strategies for new physics searche s at CMS are shifting towards the less trivial approaches. And the main que stion to address in the talk: What do we have now and what our next steps c ould be to uncover new particles? LAST-MODIFIED:20161031T132316Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170418T171500Z DTEND:20170418T181500Z DTSTAMP:20260828T094430Z UID:an41m890q73teubm17b3enht08@google.com CREATED:20170405T131702Z DESCRIPTION:Speaker Name: Mr. Teddy Baker\n\nSpeaker Institute: UMCP\n\nTit le: Local Molecular Field Theory for Non-equilibrium Systems\n\nAbstract: L ocal molecular field (LMF) theory is a way of treating the averaged effects of long ranged and slowly varying Coulomb and van der Waals intermolecular interactions on the equilibrium properties of a molecular system of intere st by studying a simpler "mimic system" with appropriately chosen short ran ged intermolecular interactions and a self consistently determined effectiv e single particle potential. Here we adapt this method to non-equilibrium p roblems\, starting from the exact time dependent Bogoliubov–Born–Green–Kirk wood–Yvon (BBGKY) hierarchy. Many simplifications from the slowly varying n ature of the long ranged interactions used to derive equilibrium LMF theory carry over to non-equilibrium systems. By making a physically motivated ap proximation for effects of the long ranged forces on the momentum distribut ion\, we arrive at a self consistent LMF equation relating a time dependent effective field to the induced molecular structure. Preliminary results fo r a model system where water responds to a time dependent electric field ge nerated by two ​confining ​charged walls are very promising. LAST-MODIFIED:20170410T184208Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171212T160000Z DTEND:20171212T170000Z DTSTAMP:20260828T094430Z UID:791gupbd3ntocor6qv7p8nh2h3@google.com CREATED:20171205T160635Z LAST-MODIFIED:20171205T160635Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180420T190000Z DTEND:20180420T203000Z DTSTAMP:20260828T094430Z UID:6o3lqeb4lhsvtl6evl9d6097tt@google.com CREATED:20180413T145710Z DESCRIPTION:
Speaker: \;Raman Sundrum

Speaker Institution: Un iversity of Maryland

Title: Asymptotic Symmetries and Holograp hy

Abstract: \;Infinite-dimensional Asymptot ic Symmetries of gauge theory and gravity are discussed\, starting in 4D Mi nkowski spacetime (where most of the literature is focused) and then moving to 4D AdS spacetime. In the latter case\, I explore the connection between such symmetries and the 3D CFT “holographic” dual description of 4D AdS ph ysics. The common denominator in both spacetimes is the appearance of 3D Ch ern-Simons gauge structure in the (suitably defined) soft limit of 4D ampli tudes. \; LAST-MODIFIED:20180413T145715Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160518T150000Z DTEND:20160518T160000Z DTSTAMP:20260828T094430Z UID:tumss2hmfkfg29umleojojip0o@google.com CREATED:20160513T141118Z DESCRIPTION:Speaker: Keith Lee\n\nSpeaker Affiliation: University of Toront o\n\nTitle: Quantum algorithms and field theory: problems and connections t o quantum optics\n\nAbstract: To give a reference point for the talk\, I sh all briefly summarize existing results regarding quantum computing for and from quantum field theory. I'll then describe some solved or open technical problems arising in this context\, mentioning possible solutions of the la tter. As will be apparent from this discussion\, there exist various connec tions with topics in quantum optics and AMO physics. These include methods for state preparation\, in particular adiabatic rapid passage\, which I'll present in detail\, as well as the issue of what one can do with a small qu antum computer. LAST-MODIFIED:20160516T133643Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170210T153000Z DTEND:20170210T163000Z DTSTAMP:20260828T094430Z UID:fl4sbr13niieee783vh1itjeqc@google.com CREATED:20170113T190351Z DESCRIPTION:Speaker: Professor Vinothan Manoharan \n\nSpeaker Institution: Harvard University\n\nTitle: A particle walks into an interface...\n\nAbs tract \; A variety of useful materials and structures can be engineered by binding microscopic solid particles to liquid interfaces. But the dynamics of binding and the interactions that control it are still not well understo od. Using digital holographic microscopy\, a fast 3D imaging technique\, we measure the motion of colloidal particles near a liquid interface. We find that micrometer-sized polymer particles take a surprisingly long time -- w eeks or even months -- to bind and relax to equilibrium. This behavior can be understood in terms of contact-line pinning. I will discuss how the pinn ing might affect the self-assembly of such particles after they bind. LAST-MODIFIED:20170118T162858Z LOCATION: DeWalt Seminar Room (EGR-2164) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special ME Seminar - "A Particle Walks into an Interface..." TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180208T123000 DTEND;TZID=America/New_York:20180208T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180208T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Joe Hart\nUMD - Physics and IREAP\nTitle: Experiments with arbitrary networks in time-multiplexed delay systems\nAbstract: Comple x networks of coupled oscillators have proven to be systems that can displa y incredibly rich dynamical behaviors. Despite great theoretical advances i n our understanding of coupled oscillator networks\, it has proven difficul t to design experiments that permit the study of dynamics on large networks with arbitrary topology. Here we present a new experimental approach that allows for the investigation of large networks of truly identical nodes wit h arbitrary topology. Our approach relies upon the space-time interpretatio n of systems with time delay in order to construct a network of coupled map s using a single nonlinear\, time-delayed feedback loop. This system has ma ny advantages: the network nodes are truly identical\, the network is easil y reconfigurable\, and the network dynamics occur at high speeds. We use th is system to study cluster synchronization and chimera states in both small and large networks of different topologies. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180503T123000 DTEND;TZID=America/New_York:20180503T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180503T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: James Yorke\nUMD Math\nTitle: Heterogenous chaotic att ractors\nAbstract: There is a saying: "there are two kinds of people in the world—the simple-minded and the muddle-headed."\nI prefer the former. But much of the investigation of chaotic attractors uses models that are someti mes overly simplistic at least for studying high dimensional chaotic attrac tors. Our goal is to produce more models that are still simplistic but bett er reflect typical high dimensional chaotic attractors and permit a better but still simple-minded understanding of chaos in high dimensions.\nThis is a report on joint work with Miguel Sanjuan and Yoshi Saiki. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180501T150000Z DTEND:20180501T161500Z DTSTAMP:20260828T094430Z UID:0quotkmeasjdjtar1u5jfgg1f6@google.com CREATED:20180209T213716Z DESCRIPTION:
Speaker: Jeffrey Teo (University of Virginia)

Title : \;Coupled wire models of new \;quantum Hall state s and \;fractional topological insulators

Abstract: \ ;The coupled wire construction has been widely applied in t he theory of topological phases. It provided exactly solvable models of the fractional quantum Hall states\, such as the Laughlin\, Moore-Read and Rea d-Rezayi states\, as well as interacting \;surface states of topologica l insulators and superconductors. In this talk\, we focus on an exactly sol vable description of topological phases of partons\, which are fermionic di vision of the electron. They include the parton quantum Hall state at filli ng one-third\, the parton Pfaffian state at filling one-sixth that is symme tric under a new notion of particle-hole symmetry\, and surfaces and hetero structures of fractional topological insulators. We also discuss the applic ation to new integer quantum Hall states and topological paramagnets.

Host: Tom Iadecola

http://www.ph ysics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20180416T172501Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161101T190000Z DTEND:20161101T200000Z DTSTAMP:20260828T094430Z UID:rd3kgk56rq9t77gn8kmhvnd1ek@google.com CREATED:20160623T143038Z DESCRIPTION:Speaker Name: Professor Laurens Molenkamp\n\nSpeaker Instituti on: Wuerzburg\n\nTitle: Topological Insulators – a New State of Matter\n\n Abstract: Topological insulators are a novel class of materials that exhib it a novel state of matter – while the inside (bulk) of the materials are e lectrical insulating\, their surface is metallic. This effect occurs becaus e the band structure of the materials is topologically different (in a math ematical sense) from the outside world.\n\nThis talk describes our discover y of this type of behavior while studying the charge transport properties o f thin\, two-dimensional layers of the narrow-gap semiconductor HgTe. These layers exhibit the quantum spin Hall effect\, a quantized conductance whic h occurs when the bulk of the material is insulating. Using various tricks one can show that the transport occurs along one-dimensional\, spin-polariz ed channels at the edges of the sample.\n\nAlso thicker HgTe samples can be turned into topological insulators\, but now the surface states are two-di mensional metallic sheets. The metal in these sheets is rather exotic in th at the band structure is similar to that encountered for elementary particl es – the charge is carried by so-called Dirac fermions. This means that exp eriments on these layers can be used to test certain predictions from parti cle theory that are difficult to access otherwise.\n\nAs an example\, I wil l describe experiments where a supercurrent is induced in the surface state s by contacting these structures with Nb electrodes. AC investigations indi cate that the induced superconductivity is strongly influenced by the Dirac nature of the surface states. We present strong evidence for the presence of a gapless Andreev mode in our junctions.\n\nFinally\, by playing with th e strain in the layers\, we can turn HgTe into a Dirac semimetal\, which ex hibits the ‘axial anomaly’ known from particle physics when the Fermi level is tuned to the Dirac points.\n\nHost: Mohammad Hafezi\, Charles Clark and Victor Yakovenko. LAST-MODIFIED:20161024T141104Z LOCATION:PSC lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:SPECIAL TIME! 3 p.m. Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170329T150000Z DTEND:20170329T160000Z DTSTAMP:20260828T094430Z UID:mfvmlde9lthdso3ekt6i7ir6v0@google.com CREATED:20170106T133830Z DESCRIPTION:Speaker: Wim van Dam\n\nSpeaker Affiliation: University of Cali fornia Santa Barbara\n\nTitle: Tunneling in Quantum Adiabatic Optimization\ n\nAbstract: This talk will address several aspects of tunneling when attem pting quantum adiabatic optimization (QAO). First\, I derive how the width and height of potential barriers affect the minimal spectral gap of the QAO algorithm. This derivation uses elementary techniques and confirms and ext ends an unpublished folklore result by Goldstone. Next\, \nI discuss to whi ch extend the asymptotic scaling of spectral gaps is relevant for reasonabl y sized systems. For tunneling we will see that the asymptotic behavior of the spectral gap does not accurately describe the exact gap behavior for sy stems of less than 10^12 qubits. Lastly\, we ask what happens if we run the QAO algorithm faster than the adiabatic condition prescribes\, i.e. if we perform non-adiabatic (or diabetic) optimization. I will show that typicall y the runtime suggested by the adiabatic theorem is not only a sufficient\, but also necessary. This result indicates that for generic problem instanc es non-adiabatic optimization will not outperform QAO\, although there are atypical exceptions to this rule. \n\nThis is joint work with Lucas Brady. LAST-MODIFIED:20170317T130238Z LOCATION:3100A Atlantic Building (Computer and Space Science Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180720T193000Z DTEND:20180720T210000Z DTSTAMP:20260828T094430Z UID:4ptnjb95nrfe71lopa9aiis8l0@google.com CREATED:20180711T192006Z DESCRIPTION:Speaker Name: Kevin Cox\n\nSpeaker Institution: Army Research L aboratory (ARL)\n\nTitle: Heads or Tails -- atomic sensors that harness qua ntum identicality and entanglement\n\nAbstract: Measurement devices based o n neutral atoms perform some of the most precise absolute measurements in t he world. I will lead an intuitive discussion about how the fundamental ten ets of quantum mechanics lead to extreme sensing capabilities and the techn iques used to bring these ideas into reality as practical quantum devices.\ n\nNotes: Food and beverages served after the talk. LAST-MODIFIED:20180711T192446Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI summer school TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180807T170000Z DTEND:20180807T183000Z DTSTAMP:20260828T094430Z UID:18udi33mgc5imjnkl11duu6uka@google.com CREATED:20180730T131943Z DESCRIPTION:Speaker: Xunjie Xu\, \;Max Planck Institute

Title: B SM physics in neutrino scattering

Abstract: Neutrinos interact very weakly with matter and had been very difficult to detect in the past. Futur e neutrino scattering experiments (e.g. Coherent neutrino-nucleus scatterin g) can not only measure neutrino interactions to high precision\, but also be very sensitive to new physics beyond the Standard Model (BSM). In this t alk\, I am going to introduce both neutrino-nucleus and neutrino-electron s cattering experiments. I will show their sensitivities in searching for BSM physics and the potential to solve the Dirac/Majorana nature problem of ne utrinos in the presence of new physics.
Based on: 1802.05171\,1803.00060 \,1702.05721\,1612.04150
LAST-MODIFIED:20180801T191320Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180511T200000Z DTEND:20180511T204000Z DTSTAMP:20260828T094430Z UID:7l0lejttaeb2aiobfkk6hvupm7@google.com CREATED:20180503T133539Z DESCRIPTION:Speaker Name: Su-Kuan Chu\n\nSpeaker Institution: JQI and QuICS \n\nTitle: Scale-Invariant Continuous Entanglement Renormalization of a Che rn Insulator\n\nAbstract: Multi-scale entanglement renormalization ansatz ( MERA) is a quantum circuit that renormalizes entanglement in real space at different length scales. It is widely believed that chiral topologically or dered states cannot have a scale-invariant MERA circuit. In this talk\, we show that the continuous MERA (cMERA)\, a modified version of MERA adapted for field theories\, possesses a fixed point wavefunction with nonzero Cher n number. Additionally\, it is well known that reversed MERA circuits can b e used to prepare quantum states efficiently in time that scales logarithmi cally with the size of the system. However\, state preparation via MERA typ ically requires the advent of a full-fledged universal quantum computer. In this talk\, we demonstrate that our cMERA circuit can potentially be reali zed in existing analog quantum computers\, i.e.\, ultracold atomic gas syst ems. This is done by loading fermions into an optical lattice and introduci ng spin-orbit coupling and synthetic selection rules. \n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180511T192441Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170424T200000Z DTEND:20170424T210000Z DTSTAMP:20260828T094430Z UID:sgqdsqo1cqdelbv21knff492ng@google.com CREATED:20170421T131434Z DESCRIPTION:Speaker Name: Dr. Michael Murrell\n\nSpeaker Institution: Yal e University\n\nTitle: Mechanical Force Production in a Biomimetic Cell Cy toskeleton\n\nAbstract: While the molecular interactions between myosin mo tors and Factin are well known\, the relationship between Factin organizati on and myosin-mediated force generation remains poorly understood. Here\, w e explore the accumulation of myosin-induced stresses within a 2D biomimeti c model of the actomyosin cortex\, where myosin activity is controlled spat ially and temporally using light. By controlling the geometry and the durat ion of myosin activation\, we show that contraction of disordered actomyosi n is highly cooperative\, telescopic with the activation area and generates a pattern of mechanical stresses consistent with those observed in contrac tile cells. We quantitatively reproduce these properties using an in vitro isotropic model of the actomyosin cytoskeleton\, and explore the physical o rigins of telescopic contractility in disordered networks using agent-based simulations. LAST-MODIFIED:20170421T132348Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181018T180000Z DTEND:20181018T193000Z DTSTAMP:20260828T094430Z UID:78illkt2c26ek0bbebkhuv37u6@google.com CREATED:20180914T135658Z DESCRIPTION:Title: Topologically protected Bogoliubov Fermi surfaces\n\n\nS peaker: Daniel Agterberg\, University of Wisconsin\n\nAbstract: \n\nIt is c ommonly believed that\, in the absence of disorder or an external magnetic field\, there are three possible types of superconducting excitation gaps: The gap is nodeless\, it has point nodes\, or it has line nodes. Here\, we show that\, for an even-parity nodal superconducting state which spontaneou sly breaks time-reversal symmetry\, the low-energy excitation spectrum gene rally does not belong to any of these categories\; instead\, it has extende d Bogoliubov Fermi surfaces [1\,2]. These Fermi surfaces are topologically protected from being gapped by a non-trivial Z2 invariant. In this talk\, I will discuss the physical origin\, topological protection\, and energetic stability of these Bogoliubov Fermi surfaces\, using superconductivity in j =3/2 fermions as a representative example.\n\nReferences \n1. D.F. Agterber g\, P.M.R. Brydon\, and C. Timm\, Phys. Rev. Lett. 118\, 127001 (2017) .\n2 . P. M. R. Brydon\, D. F. Agterberg\, H. Menke\, and C. Timm\, arXiv:1806.0 3773.\n\nRefreshments Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20180914T150352Z LOCATION:Rm 1201 John S Toll Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Daniel Agterberg\, University of Wisconsin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180301T203000Z DTEND:20180301T213000Z DTSTAMP:20260828T094430Z UID:0v0f9h6d70hrf17sr6vfafkmie@google.com CREATED:20180226T144846Z DESCRIPTION:Speaker: Ian Teixeira and Matthew Yu -\nAbstract: We will conti nue going through Nigel Hitchin's Lectures on Generalized Geometry\, arXiv: 1008.0973. The topic this time will be generalized Kaehler manifolds. LAST-MODIFIED:20180226T144846Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Hitchin notes section 4 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170921T150000Z DTEND:20170921T160000Z DTSTAMP:20260828T094430Z UID:2g6sam2sgns4jcuvsq2rnsc3go@google.com CREATED:20170914T173703Z DESCRIPTION:Speaker: Professor Millard Alexander\, UMCP\n\nTitle: The Quadr uple Bond Character of the Dicarbon Molecule\n\nAbstract: The bonds formed by 8 valence electrons in the dicarbon molecule present an interesting dile mma. A simple Lewis dot structure allows a quadruple bond. Quantum elec tronic structure calculations will allow us to explore the role of quadrupl e bonds in this and other similar small molecules. \n\n LAST-MODIFIED:20170914T173703Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180223T160000Z DTEND:20180224T010000Z DTSTAMP:20260828T094430Z UID:49ss0j62kq89lajcrkh9202al3@google.com CREATED:20180212T151337Z DESCRIPTION:Agenda and details here: https://leadersinenergy.org/extravagan za-2018/ LAST-MODIFIED:20180212T151337Z LOCATION:Adele H. Stamp Student Union\, 3972 Campus Dr\, College Park\, MD 20742\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Clean Energy and Sustainability Extravaganza TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180209T160000Z DTEND:20180209T170000Z DTSTAMP:20260828T094430Z UID:6mbkqu2humpot5nkbha9u66pel@google.com CREATED:20180202T191746Z DESCRIPTION:\n**New time and location**\nSpeaker: Gökçe Başar\n\nSpeaker In stitution: University of Illinois\, Chicago\n\nTitle: Going with the flow: complexified path integrals and a solution to the sign problem. \n\nAbstrac t: I will explore the generalization of the Feynman path integral in quantu m field theory to complexified fields\, and explain how it can be utilized to tackle the famous "sign problem". The sign problem prevents ab-initio s tudies of real-time dynamics and finite density systems via lattice field t heory and appears in many different areas in physics. I will discuss both c onceptual and computational aspects of this idea and give examples of sever al interacting quantum field theories where it successfully solves the sign problem. LAST-MODIFIED:20180207T151243Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180827T190000Z DTEND:20180827T203000Z DTSTAMP:20260828T094430Z UID:3ap87t15gspgc58n02e29jc94v@google.com CREATED:20180820T153358Z DESCRIPTION:\nSpeaker: Johann Brehmer\n\nSpeaker Institution: NYU\n\nTitle: Learning to constrain new physics\n\nAbstract: An important part of the LH C legacy will be precise limits on indirect effects of new physics\, parame terized for instance in an Effective Field Theory (EFT). These measurements involve many parameters and observables and are often challenging for esta blished analysis methods. We explain the structure of this “likelihood-free ” inference problem\, review a wooden “simulation" from the 19th century\, and discuss why physicists usually don’t acknowledge these aspects (but per haps should). We then present powerful new analysis techniques based on mac hine learning. In an example analysis of WBF Higgs production we show that they let us put stronger constraints on EFT parameters than established met hods\, demonstrating their potential to improve the new physics reach of th e LHC legacy measurements. While developed for particle physics\, these ide as can be applied to a broad class of problems in fields as diverse as cosm ology\, genetics\, and epidemiology. LAST-MODIFIED:20180820T153409Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180620T150000Z DTEND:20180620T161500Z DTSTAMP:20260828T094430Z UID:20lnm0ejov3oq5c901brruou7o@google.com CREATED:20180608T131257Z DESCRIPTION:Speaker: Christopher Mudry (Paul Scherrer Institute)

Tite: A model of chiral spin liquids with tunable chiral edge states

Abstract: We present a two-dimensional lattice model for quantum spin-1/2
for which the low-energy limit is governed by four fl avors of strongly
interacting Majorana fermions. We study this low-ener gy effective theory
using two alternative approaches. The first consist s of a mean-field
approximation. The second consists of a Random Phase approximation (RPA)
for the single-particle Green's functions of the Ma jorana fermions built
from their exact forms in a certain one-dimension al limit. The resulting
phase diagram consists of two competing chiral phases\, one with Abelian
and the other with non-Abelian topological or der\, separated by a
continuous phase transition. Remarkably\, the Majo rana fermions propagate
in the two-dimensional bulk\, as in the Kitaev model for a spin liquid on
the honeycomb lattice. We identify the vison fields\, which are mobile
(they are static in the Kitaev model) domain walls propagating along only
one of the two space directions. LAST-MODIFIED:20180608T131619Z LOCATION:CMTC Conference Room (Toll 2205) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160421T180000Z DTEND:20160421T190000Z DTSTAMP:20260828T094430Z UID:0h8o4ogl1vq2p563kl31oej3v0@google.com CREATED:20160126T185328Z DESCRIPTION:Speaker Name: Krishna Balram (IREAP/NIST/CNST)\n\nTitle: Piezo -optomechanical circuits\n\nAbstract: The ability to coherently link the o ptical\, RF\, and mechanical domains becomes critical for applications rang ing from quantum state transfer between the RF and optical domains to perfo rming signal processing in the acoustic domain for microwave photonics. We develop such a piezo optomechanical circuit platform in GaAs\, in which loc alized and interacting 1550 nm photons and 2.4 GHz phonons are combined wit h photonic and phononic waveguides. GaAs allows us to exploit the photoelas tic effect to engineer cavities with strong optomechanical coupling (g0/2π ˜ 1.1 MHz) and the piezoelectric effect to couple RF fields to mechanical m otion through surface acoustic waves (SAW) and route it using on-chip phono nic waveguides. This platform enables a number of novel demonstrations incl uding read out of electrically injected mechanical states with an average c oherent intracavity phonon number as small as ˜ 0.05 and the ability to dri ve mechanical motion with equal facility through either optical or electric al channel resulting in a novel acoustic wave interference effect leading t o complete cancellation of coherent motion. We use this interference effect to achieve optical control of acoustic pulse propagation by demonstrating acoustic pulse position modulation.\n\nReferences:\nK.C. Balram\, M. Davanc o\, J. D. Song and K. Srinivasan\, “Coherent coupling between radio frequen cy\, optical and acoustic waves in piezo-optomechanical circuits”\, arxiv:1 508.01486 (2015).\n\nHOST: Dan Lathrop\n LAST-MODIFIED:20160419T202606Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Krishna Balram (IREAP/NIST/CNST) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160713T170000Z DTEND:20160713T183000Z DTSTAMP:20260828T094430Z UID:t6emosrvosquivh68dsn7us3cc@google.com CREATED:20160707T193601Z DESCRIPTION:Yiming Cai\, TQHN\, Pre-Candidacy Talk\n\nTitle: Sign problem i n QCD with a theta term ---- subtleties with the infinite volume limit\n\nA bstract: QCD and related gauge theories have a sign problem when a theta -t erm is included. The sign problem inhibits our ability to use numerical lat tice method to explore many significant problems in QCD. Some subtle effect s arise in the infinite volume limit which has interplay with the sign prob lem. This talk will illustrate these effects. LAST-MODIFIED:20160707T193609Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Yiming Cai Pre-Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180209T180000Z DTEND:20180209T190000Z DTSTAMP:20260828T094430Z UID:0ps7fa40gk086tt4a08d1h2nar@google.com CREATED:20180205T150505Z DESCRIPTION:

Speaker: Dmitri N. Basov\, Ph.D.

Speaker Institu tion: Columbia University\, Department of Physics \;

Title: P olaritons in van der Waals materials: Insights from near field nano-optics< /i>

Abstract: In 1944 Hans Bethe reported on “the diffraction ofelec tromagnetic radiation by a hole small compared with the wave-length.” Thiss eminal paper was among the early precursors to a new and vibrant area ofres earch: near field nano-optics. \; In this seminar\, Dr. Basov will disc ussrecent nano-optical experiments on van der Waals materials including gra pheneand transition metal dichalocogenides. Central to the nano-optical exp lorationof quantum materials is the notion of polaritons: hybrid light matt er modes thatare omnipresent in polarizable media. Infrared nano-optics all ows one todirectly image polaritonic standing waves yielding rich insights into theelectronic phenomena of the host material supporting polaritons. Dr . Basov willgive a progress report on the search for the role of the Berry phase in theproperties of graphene via transient polaritonic imaging.

 \;

Friday \, February 9\, 2018\, 1:00 - 2:00 p.m.

Room 2110 Chemi cal &\; Nuclear Engineering Building

Additional info: http://www.mse.umd.edu /events/seminars \;or see attached flyer.



LAST-MODIFIED:20180205T150505Z LOCATION:2110 Chemical & Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar & NanoColloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180201T123000 DTEND;TZID=America/New_York:20180201T133000 RRULE:FREQ=WEEKLY;UNTIL=20180511T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20180322T123000 EXDATE;TZID=America/New_York:20180510T123000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com CREATED:20180125T194828Z DESCRIPTION:Speaker: TBA\nAffiliation TBA\nTitle: TBA\nAbstract: TBA LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180423T203000Z DTEND:20180423T213000Z DTSTAMP:20260828T094430Z UID:0pqcl8104fe4i3n4bngrs6595a@google.com CREATED:20180404T201542Z DESCRIPTION:Speaker Name: Greg Sullivan

Speaker Institution: Departm ent of Physics\, University of Maryland

Title: The South Pole IceCub e Neutrino Detector and the Era of Multi-Messenger Astronomy

Abstrac t: In 2013\, The IceCube Neutrino Observatory \;re vealed the first evidence for high-energy neutrinos of astrophysical origin . That discovery represented the "first light" in a decades old quest to ob serve the high-energy universe with neutrinos. I will review the motivation for using neutrinos as astronomical messenger particles and the evidence o f astrophysical neutrinos from the IceCube detector. I will also present so me exciting recent developments that hold the promise of heralding in a new era in multi-messenger astronomy. I discuss how this new astronomy may hel p us solve the century old mystery on the origin of the high energy cosmic rays and the extreme astrophysical processes that produce them.

Note s: Coffee\, Tea and Sna cks 4:15-4:30 PM LAST-MODIFIED:20180414T001458Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161121T200000Z DTEND:20161121T213000Z DTSTAMP:20260828T094430Z UID:g5d7skdv6trf21rpk46l08caeo@google.com CREATED:20161108T140900Z DESCRIPTION:**This event has been canceled**\n\nSpeaker: Zhen Liu\n\nSpeake r Institution: Fermilab\n\nTitle: New challenges and opportunities from int erference effects for ttbar resonance searches at the LHC\n \nAbstract: The heavy scalar resonance search channel of gg→S→tt is known to be very chall enging\, caused by a large destructive interference with the SM background. We analyze the line shapes of heavy scalars in several well-motivated beyo nd the standard model physics models. Commonly existing additional contribu tions to the glu-glu-scalar coupling change the relative phases of the sign al and background amplitudes\, inducing new opportunities in this channel. In many cases\, we also make connections with the corresponding indirect co nstraints from the observed light Higgs boson properties. We further outlin e various methods to improve the LHC search in this channel. LAST-MODIFIED:20161121T141759Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELED EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180411T200000Z DTEND:20180411T210000Z DTSTAMP:20260828T094430Z UID:0q1fost3j3ppjbc72crpajn0nc@google.com CREATED:20180406T145831Z DESCRIPTION:
Speaker Name: \; Ivone Albuquerque

Speaker Insti tution: \; University of Sao Paulo

Title: "Probing Velocit y Dependent Self Interacting Dark Matter with Neutrino Telescopes"
Abstract: \; \; \;In this talk velocity dependent self-interacting dark matter models (vdSIDM) will be considered. A brief discussion on how dark matter self interactions migh t alleviate potential CDM problems at small scales will be presented. Follo wing it will be shown that data already collected by the IceCube-DeepCore n eutrino telescopes can probe most of the interesting vdSIDM parameter space . Finally that indirect detection through neutrinos can compete with the st rong existing limits from direct detection experiments\, specially in the c ase of isospin violation. \;

 LAST-MODIFIED:20180406T150239Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY: HIGH ENERGY / ASTROPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180326T200000Z DTEND:20180326T213000Z DTSTAMP:20260828T094430Z UID:458un2fh734kb37a9ins8jjc73@google.com CREATED:20180315T135526Z DESCRIPTION:\nSpeaker: Pedro Machado\n\nSpeaker Institution: Fermilab\n\nTi tle: Distorted Neutrino Oscillations From Ultralight Scalar Dark Matter\n\n Abstract: In this talk I will show how cold\, ultralight bosonic dark matte r can induce temporal variation in the masses and couplings of Standard Mod el particles. These modulations significantly distort neutrino oscillations \, yielding striking signatures at long baseline experiments like DUNE and JUNO. LAST-MODIFIED:20180315T135534Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180502T190000Z DTEND:20180502T200000Z DTSTAMP:20260828T094430Z UID:18nrmvv672pb1u6n50sbpr3bo9@google.com CREATED:20180427T131037Z DESCRIPTION:Speaker: S. Edward Hawkins III\, Ph.D.\n\nTitle: The Europa Im aging System (EIS) on the Europa Clipper Mission\n\nAbstract:\nThe Europa C lipper mission will place a spacecraft in orbit around Jupiter in order to perform a detailed investigation of the Galilean moon\, Europa. The mission poses many technological challenges\, requiring the spacecraft and payload to perform in one of the harshest environments in the solar system. Meetin g those challenges promises to return insights into a world that shows stro ng evidence for a liquid water ocean beneath an icy crust. The water oceans could host conditions favorable for life. This talk provides an overview o f the mission\, details of the primary imaging instrument\, EIS\, and how o ne designs an instrument to observe this unexplored world while satisfying the severe planetary protection requirements and surviving the harsh radiat ion environment.\n\nBiography:\nDr. Hawkins is a full-time member of the Pr incipal Professional Staff at The Johns Hopkins University Applied Physics Laboratory where he is the Supervisor of the Optical Systems Development Se ction of the Space Instrumentation Group. He has been designing and buildin g space instruments for more than 30 years and has led numerous instrument development efforts\, including the NEAR-Shoemaker Multi-Spectral Imager\, the Ulysses HI-SCALE instrument\, and the MESSENGER MDIS Instrument studyin g Mercury. In recent years he has spearheaded the effort to design and buil d numerous optical sensors to support the Missile Defense Agency. He curre ntly is involved in supporting the development of the Europa Imaging System \, EIS\, to explore the Jovian moon as part of the Europa Clipper mission. LAST-MODIFIED:20180427T131037Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161202T153000Z DTEND:20161202T213000Z DTSTAMP:20260828T094430Z UID:ifop78n58g2v1k9hcvbfed6fks@google.com CREATED:20161128T155238Z DESCRIPTION:4th Metro Area Differential Geometry Seminar (MADGUYS)\, organi zed jointly by Howard University\, Johns Hopkins University and the Univers ity of Maryland.\n\nDate: Friday\, December 2\, 2016\nPlace: University of Maryland\, College Park\nRoom: Room 0112 in the Chemistry/Biochemistry Buil ding\n\nSpeakers:\n\nSun-Yung Alice Chang (Princeton)\nJake Solomon (Hebrew /IAS)\nSteve Zelditch (Northwestern)\n\nAbstracts: http://math.jhu.edu/~ber nstein/MDGS/Speakers.html\n\nAll are invited\, there are no registration fe es. Young mathematicians and\nstudents are especially encouraged to attend. \n\nFor more details please check the webpage\n\nhttp://math.jhu.edu/~berns tein/MDGS/index.html LAST-MODIFIED:20161129T161613Z LOCATION: Room 0112 in the Chemistry/Biochemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MADGUYS 4 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180503T180000Z DTEND:20180503T193000Z DTSTAMP:20260828T094430Z UID:44ag02dnrpqlri5j1c9b3un20a@google.com CREATED:20180129T164559Z DESCRIPTION:\nSPEAKER: Manuel Houzet\, CEA France\n\nTitle: Andreev and Ma jorana Weyl crossings in multi-terminal Josephson junctions\n\nAbstract: We analyze the Andreev spectrum in a four-terminal Josephson junction between conventional and topological superconductors. We find that a topologically protected crossing in the space of three superconducting phase differences can occur between the two Andreev bound states with lower energy. We discu ss the possible detection of this crossing through the nonlocal conductance quantization between two voltage-biased terminals.\n\nHOST: Jay Deep Sau LAST-MODIFIED:20180427T200859Z LOCATION:Toll Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Manuel Houzet\, CEA France TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171114T181500Z DTEND:20171114T191500Z DTSTAMP:20260828T094430Z UID:0e21rl6a76d9h0p06j6nq4n0na@google.com CREATED:20171024T133631Z DESCRIPTION:Speaker: Professor Michael Fisher\, UMCP\n\nTitle: Wilson's Ren ormalization Group Theory: Ken Wilson as I Knew HIm\n\nAbstract: Ken Wilson 's invention of the Renormalization Group for systems exhibiting critical p henomena -- especially as it led to the quantitatively effective "epsilon e xpansion" -- will be explored. I will tell of Ken's vision and of my intera ctions with him as a colleague and as a friend. LAST-MODIFIED:20171024T133834Z LOCATION:IPST 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170417T200000Z DTEND:20170417T213000Z DTSTAMP:20260828T094430Z UID:6moem3q9e7me6vsu5hitcu4ca4@google.com CREATED:20170410T184551Z DESCRIPTION:Speaker: Zhen Liu\n\nSpeaker Institution: Fermilab\n\nTitle: St rong Phase at Colliders--New Physics Opportunities for ttbar Resonance Sear ches and Higgs Physics Searches\n \nAbstract: In this talk I will present s everal interesting physics cases where the strong phase from QCD plays impo rtant role in (B)SM heavy particle productions at hadron colliders. The str ong phase in these cases does alter the resonance signatures a lot and prov ide more physics insights to the underlying physics. The heavy scalar reson ance search channel of gg→S→tt is very challenging due to a large destructi ve interference with the SM background. We analyze the line shapes of heavy scalars in several well-motivated beyond the standard model physics models . Commonly existing additional contributions to the glu-glu-scalar coupling change the relative phases of the signal and background amplitudes\, induc ing new opportunities in this channel. We further outline various methods t o improve the LHC search in this channel. The strong phase also plays impor tant role in some Higgs searches channels that have long been overlooked\, and I will discuss the corresponding phenomenology and the new window opene d up for BSM physics. LAST-MODIFIED:20170410T184551Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171117T140000Z DTEND:20171117T212000Z DTSTAMP:20260828T094430Z UID:70ke7a5ipjl53rkiafspbnhaq6@google.com CREATED:20171108T185857Z DESCRIPTION:MAJORANA\n\n9:00 AMJay Sau “Teleportation as a signature for M ajorana bound states in the weak Coulomb blockade limit”\n\n9:50 AMChing-Ka i Chiu “Conductance interference in a superconducting Coulomb blockaded Ma jorana ring”\n\n10:40 AMWill Cole “1D spin-orbit coupled bosons: spin-mome ntum locking and the quantum critical point”\n\n11:30 AMChunxiao Liu “Andr eev bound states versus Majorana bound states in quantum dot-nanowire-super conductor hybrid structures: trivial versus topological zero-bias conductan ce peaks”\n\n12:20-1:45 Lunch Break\n\n1:50 PMYi-Ting Hsu “Topological su perconductivity in monolayer transition metal dichalcogenides”\n\nSPIN QUBI TS\n\n2:40 PMRobert Throckmorton “Fast pulse sequences for dynamically cor rected gates in singlet-triplet qubits”\n\n3:30 PMYang Song “Spin-orbit co upling induced two-electron relaxation in silicon donor pairs”\n LAST-MODIFIED:20171115T231926Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC FALL SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180309T180000Z DTEND:20180309T190000Z DTSTAMP:20260828T094430Z UID:1nc374s72ke4f5dv9nr884pqps@google.com CREATED:20180227T140242Z DESCRIPTION:Title: American Physical Society Meeting LAST-MODIFIED:20180227T140242Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181009T150000Z DTEND:20181009T161500Z DTSTAMP:20260828T094430Z UID:28mstv8mpvv83la3t3ndd6gvtf@google.com CREATED:20180904T190605Z DESCRIPTION:Title: Braiding Light (and Majoranas too)

Speaker: Claudio Chamon\, Boston University

Abstract: In this talk I will discuss platforms for the direct demonstration of \ ;non-Abelian Berry phases by braiding topological zero modes. To this \ ;end\, we study novel ways to control and program the position of
topolo gical zero modes in both photonic and electronic settings. In the \;pho tonic systems\, we study coherent states of light injected into \;"topo logical guided modes" in specially-fabricated photonic waveguide
arrays. We show that light traveling inside well-separated topological \;guide d modes can be braided\, leading to the accumulation of non-Abelian \;p hases\, which depend on the order that the guided light beams are wound&nbs p\;around each other. In electronic systems\, we present a hierarchical&nbs p\;architecture for building "logical" Majorana zero modes using "physical"  \;Majorana zero modes at the Y-junctions of a hexagonal network of
semiconductor nanowires. In this network\, the location of the \;topolo gical zero modes can be moved by programming gate voltages to \;change as functions of time.

Host: Tom Iadecola

Condensed Matter The ory Center website:
http://www.physics.umd.edu/cmtc/seminars.html< /a> LAST-MODIFIED:20180912T184238Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170907T150000Z DTEND:20170907T160000Z DTSTAMP:20260828T094430Z UID:5grm6v8p0gurhe7dnn4oltdm7g@google.com CLASS:PUBLIC CREATED:20170710T111105Z DESCRIPTION:Speaker: Vincenzo Tamma\n\nSpeaker Affiliation: University of P ortsmouth\n\nTitle: Spectral correlations among interfering nonidentical ph otons in universal linear optics\n\nAbstract: Multiphoton quantum interfere nce underpins fundamental tests of quantum mechanics and quantum technologi es. Consequently\, the detrimental effect of photon distinguishability in m ultiphoton interference experiments can be catastrophic. In this talk\, we describe how accessing the spectral properties of an arbitrary number of ph otons initially distinguishable in their quantum states allows the scalable restoration of quantum interference in arbitrary linear optical networks\, without the need for additional filtering or post selection. Even more int erestingly\, we show how harnessing the full spectra of multiphoton quantum information by frequency and time resolved correlation measurements enable s the characterization of multiphoton networks and states\, produces a wide variety of multipartite entanglement\, and increases the possibilities to achieve quantum computational supremacy. Furthermore\, the multiphoton inte rference techniques described here pave the way to a scaling-up of multipho ton interference experiments. These results are therefore of profound inter est for future applications of universal spectrally resolved linear optics across fundamental science and quantum technologies with photons with exper imentally different spectral properties.\n\n\nReferences\n[1] S. Laibacher and V. Tamma\, arXiv:1706.05578\n[2] V. Tamma and S. Laibacher\, Phys. Rev . Lett. 114\, 243601 (2015)\n[3] S. Laibacher and V. Tamma\, Phys. Rev. Let t. 115\, 243605 (2015)\n[4] V. Tamma and S. Laibacher\, Quantum Inf. Proce ss. 15(3)\, 1241-1262 (2015) LAST-MODIFIED:20170801T190936Z LOCATION:Atlantic 3100A SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180222T190000Z DTEND:20180222T203000Z DTSTAMP:20260828T094430Z UID:685d8sdekt6n8rdgtg16c0a6v8@google.com CREATED:20180216T202403Z DESCRIPTION:
SPEAKER: Nick Butch\, NIST

TITLE: \; Benea th hidden order

 \;ABSTRACT:

The intermetallic c ompound URu2Si2 is among the best-known cases of correlated electron physics\, highlighting the difficulty that we still hav e accurately describing interactions involving electrons originating in f-o rbitals. \; The most glaring manifestation of our lack of understanding is the Hidden Order phase\,characterized by a clear phase tra nsition\, but an experimentally undetermined order parameter that remains e lusive despite 30 years of looking.

In this talk\, I will describe how hybridization between uranium f-electrons and i tinerant electrons leads to clear temperature-dependent correlations and a very unusual ground state. I will discuss neutron scattering measurements o n Fe-substituted samples\, in which Hidden Order transitions to antiferroma gnetism\, and what we can say about how the electronic structure inboth pha ses. I will also discuss resonant inelastic x-ray scattering m easurements aimed at identifying the degrees of freedom available to the ur anium f-electrons and how this relates to the collective low-temperature gr ound state.

LAST-MODIFIED:20180216T210401Z LOCATION:Room 1201 John S Toll Bldg.\, Refreshments at 1:30 in room 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Nick Butch\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171117T211500Z DTEND:20171117T221500Z DTSTAMP:20260828T094430Z UID:5m9cfv8uf0dojt1uce6oanadaq@google.com CREATED:20171108T140608Z DESCRIPTION:Speaker: Rodney Snyder\n\nAffiliation: JQI/CNAM\n\nTitle: Josep hson Junctions with Weak Links of Topological Crystalline Insulators\n\nAbs tract: We report on the fabrication of Josephson junctions using the topolo gical crystalline insulator Pb.05Sn0.5Te as the weak link. The properties o f these junctions are characterized and compared to those fabricated with w eak links of PbTe\, a similar material yet topologically trivial. Most stri king is the difference in the AC Josephson effect: junctions made with Pb0. 5Sn0.5Te exhibit rich subharmonic structure consistent with a skewed curren t-phase relation. This structure is absent in junctions fabricated from PbT e. A discussion is given on the origin of this effect as an indication of n ovel behavior arising from the topologically nontrivial surface state.\nhtt ps://arxiv.org/abs/1710.06077\n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171108T140614Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160727T150000Z DTEND:20160727T160000Z DTSTAMP:20260828T094430Z UID:hj0sul2ss31vkaumh9mj773ue0@google.com CREATED:20160610T145328Z DESCRIPTION:Speaker: David Gosset\n\nSpeaker Affiliation: IBM\n\nTitle: Imp roved classical simulation of quantum circuits dominated by Clifford gates\ n\nAbstract: We present a new algorithm for classical simulation of quantum circuits over the Clifford+T gate set. The runtime of the algorithm is pol ynomial in the number of qubits and the number of Clifford gates in the cir cuit but exponential in the number of T gates. The exponential scaling is s ufficiently mild that the algorithm can be used in practice to simulate med ium-sized quantum circuits dominated by Clifford gates. The first demonstra tions of fault-tolerant quantum circuits based on 2D topological codes are likely to be dominated by Clifford gates due to a high implementation cost associated with logical T gates. Thus our algorithm may serve as a verifica tion tool for near-term quantum computers which cannot in practice be simul ated by other means. To demonstrate the power of the new method\, we perfor med a classical simulation of a hidden shift quantum algorithm with 40 qubi ts\, a few hundred Clifford gates\, and nearly 50 T gates. \nThis is joint work with Sergey Bravyi (PRL 116\, 250501\, 2016). LAST-MODIFIED:20160725T134650Z LOCATION:3100A Computer and Space Science Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170727T180000Z DTEND:20170727T193000Z DTSTAMP:20260828T094430Z UID:oh887c59o3a2ob30c492ppp6vc@google.com CREATED:20170713T194222Z DESCRIPTION:Speaker: Basudeb Dasgupta\n\nSpeaker Institution: Tata Institut e of Fundamental Research\n\nTitle: Selection Rule for Enhanced Dark Matter Annihilation\n \nAbstract: Growing interest in dark matter with interactio ns mediated by a light particle has brought renewed attention to ``Sommerfe ld enhancement''. In the context of dark matter\, this typically manifests as an increase in the annihilation cross-section when the dark matter parti cles collide at low velocities. I will show that\, for two-level dark matte r\, this Sommerfeld enhancement can be selectively large for odd or even pa rtial waves of the scattering amplitude. This odd vs. even selection owes i ts origin to the exchange symmetry of the colliding particles. As an applic ation of this selection mechanism for phenomenology\, I will outline a mode l of dark matter that predicts observably large p-wave annihilation rates o nly in galaxy-sizes halos\, which explains why one may see its signal from nowhere else but the Milky Way.\n\nRef: A. Das and B. Dasgupta\, Phys. Rev. Lett. 118 (2017) no.25\, 251101 LAST-MODIFIED:20170713T194222Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180406T130000Z DTEND:20180408T160000Z DTSTAMP:20260828T094430Z UID:5fldkrd20veh80ra6470s1avq5@google.com CREATED:20180329T184016Z DESCRIPTION:MCFP Workshop on Lattice Parton Physics
Maryland Center for Fundamental Physics (MCFP)


https://indico.cern.ch/event/688396/overview



To register\, please contact Xiangdong Ji-- xji@umd.edu




LAST-MODIFIED:20180329T184053Z LOCATION:College Park Marriott Hotel and Conference Center Room: 0101 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Workshop on Lattice Parton Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161119T150000Z DTEND:20161119T170000Z DTSTAMP:20260828T094430Z UID:ttaue6vu3gnj5n9qqfia6jrl3c@google.com CREATED:20160926T202013Z DESCRIPTION:Speaker: Shabnam Jabeen\n\n So far\, in these lectures\, you h ave heard about many topics including Quantum Mechanics\, Relativity\, Cos mology and experimental techniques. in this lecture I will try to combine a ll these concepts and look at the bigger picture.\n\nA final Theory? \n\nW ill it answer questions such as\n\nWhere are my socks? \n\nOr what is comin g on the test? \n\nOr Does s/he like me? \n\nSorry\, no. It is not a cryst al ball! It is (ideally) a theory that will combine all known forces and p articles\, explain all phenomenon we observe in nature\, and will predict m any more that we may not have even thought about. \n\nIt is a theory we sti ll have to discover!\n\nIn this lecture\, first I will talk about an (almos t) theory of everything (visible)\, that is\, the standard model of particl e physics. I will then briefly discuss the possibilities for theories tha t go beyond the standard model and try to explain our universe\, from the s mallest to the largest.\n\n \n https://sites.google.com/a/physics.umd.edu/s aturday-morning-physics/home\n\n LAST-MODIFIED:20160926T202013Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: The Theory of Everything TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T213000Z DTEND:20161205T223000Z DTSTAMP:20260828T094430Z UID:0390797F-3ABA-4B17-B9B2-0A8D77245D0D CREATED:20161028T011850Z DESCRIPTION:Speaker Name: James A. Klimchuk\n\nCoffee\, Tea & Snacks 4:15-4 :30 PM\n\nSpeaker Institution : NASA Goddard Space Flight Center\n\nTitle : Nanoflare Heating of the Solar Corona\n\nAbstract: At several million deg rees\, the solar corona is three orders of magnitude hotter than the underl ying solar surface. Explaining this mystery is one of the great challenges in space science. It is generally accepted that coronal heating takes the f orm of impulsive "nano flares" but the origin of these nanoflares remains a n open question. Although they likely involve magnetic reconnection\, a com prehensive picture of the complex chain of events has yet to be established . I will explain why we can expect a proliferation of current sheets in the corona due to the constant stirring of the magnetic field by random photos pheric motions. The sheets go unstable\, leading to temporary bursts of tur bulent activity and associated heating. Millions of these events happen eve ry second across the Sun. I will explain why this picture is fundamentally different from traditional turbulence\, which has also been proposed as a m echanism for heating the magnetically-closed corona. I will emphasize the i mportance of understanding the onset conditions for magnetic reconnection.\ n LAST-MODIFIED:20161205T144926Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170929T201500Z DTEND:20170929T211500Z DTSTAMP:20260828T094430Z UID:51k6ncqsgmrlf92cc2erofokp1@google.com CREATED:20170920T172923Z DESCRIPTION:Speaker: Amir Kalev\n\nAffiliation: QuICS\n\nTitle: Rigidity of the magic pentagram game\n\nAbstract: A game is rigid if a near-optimal sc ore guarantees\, under the sole assumption of the validity of quantum mecha nics\, that the players are using an approximately unique quantum strategy. Rigidity has a vital role in quantum cryptography as it permits a strictly classical user to trust behavior in the quantum realm. This property can b e traced back as far as 1998 (Mayers and Yao) and has been proved for multi ple classes of games. In this talk I will present our results on the ridigi ty for the magic pentagram game\, a simple binary constraint satisfaction g ame involving two players\, five clauses and ten variables. In particular\, we show that all near-optimal strategies for the pentagram game are approx imately equivalent to a unique strategy involving real Pauli measurements o n three maximally-entangled qubit pairs.\n\n*Snacks and drinks will be serv ed at 4 pm* LAST-MODIFIED:20170920T172923Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180305T173000Z DTEND:20180305T190000Z DTSTAMP:20260828T094430Z UID:426i3ntjhjvgfc6796a8m642j1@google.com CREATED:20180220T192503Z DESCRIPTION:\nSpeaker: Onkar Parrikar\n\nSpeaker Institution: University of Pennsylvania\n\nTitle: The Holographic Shape of Entanglement and Einstein' s Equations \n\nAbstract: We will study the shape-dependence of entangleme nt entropy for arbitrary subregions and states in holographic conformal fie ld theories. It is typically hard to work with general states/subregions wi thout relying on symmetries\, but we will combine field-theory and gravitat ional techniques to make progress. Our analysis\, when applied to the speci al case of the vacuum state\, will lead to a new perturbative proof (i.e.\, without using the replica trick) of the Ryu-Takayanagi formula (more preci sely\, the JLMS formula) for arbitrary subregions. Finally\, we will use ou r results to argue that a general asymptotically AdS spacetime which satisf ies the Ryu-Takayanagi formula must also satisfy the non-linear Einstein's equations. Along the way\, we will also review earlier progress in understa nding the connections between holographic entanglement entropy and Einstein 's equations. LAST-MODIFIED:20180220T192633Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180226T210000Z DTEND:20180226T223000Z DTSTAMP:20260828T094430Z UID:4cjece0ct4p21u0bdltsv105fr@google.com CREATED:20180219T141709Z DESCRIPTION:\nSpeaker: Kimberly Boddy\n\nSpeaker Institution: Johns Hopkins University\n\nTitle: Cosmological Constraints on the Effective Theory of D ark Matter Interactions \n\nAbstract: There is a substantial effort in the physics community to search for dark matter interactions with the Standard Model of particle physics. In particular\, direct detection experiments se arch for rare collisions between dark matter particles and nucleons. Such c ollisions would also occur in the early Universe\, enabling a search for da rk matter interactions using cosmological observations in a parameter space that is highly complementary to that of direct detection. In this talk\, I will describe the formalism of nonrelativistic effective field theory deve loped for direct detection in the context of cosmology. For dark matter mas ses extending down to 15 keV\, I will show the upper limits on the scatteri ng cross section\, obtained using the Planck 2015 cosmic microwave backgrou nd (CMB) temperature\, polarization\, and lensing anisotropy. The effect of scattering is most prominent on small scales in the CMB power spectra and in the matter power spectrum\, and I will conclude with a discussion on imp roving constraints with data from ground-based CMB experiments and galaxy s urveys. LAST-MODIFIED:20180220T192704Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T210000Z DTEND:20161205T220000Z DTSTAMP:20260828T094430Z UID:9lksr3okks7n48mos1bk58l414@google.com CREATED:20161129T151826Z DESCRIPTION:Speaker Name: Dr. Jeanne Stachowiak\n\nSpeaker Institution : Un iversity of Texas at Austin\n\nTitle : Stochastic Mechanisms in Membrane Tr affic\n\nAbstract : Membrane traffic\, an essential cellular process that p lays a role in many human diseases\, requires key biophysical steps includi ng formation of membrane buds\, loading of these buds with specific molecul ar cargo\, separation from the parent membrane\, and fusion with the target membrane. The prevailing view has been that structured protein motifs such as wedge-like amphipathic helices\, crescent-shaped BAR domains\, curved c oats and constricting dynamin rings drive these processes. However\, many p roteins that contain these structural motifs also contain large intrinsical ly disordered protein (IDP) domains of 300-1500 amino acids\, including mos t clathrin and COPII coat components. While these IDP domains have been reg arded primarily as flexible biochemical scaffolds\, we have recently discov ered that IDPs are highly efficient physical drivers of membrane budding. F urther\, our work demonstrates that IDP domains serve as strong drivers of membrane fission. How can molecules without a defined structure drive membr ane budding and fission? Our results support the idea that disordered domai ns generate entropic pressure at membrane surfaces\, which is critical to o vercoming key biophysical barriers to membrane traffic. IDPs are particular ly efficient generators of entropic pressure owing to their very large hydr odynamic radii\, potential for electrostatic repulsion owing to high net ch arge\, and the substantial entropic cost of extending them. More broadly ou r findings suggest that any protein\, regardless of structure\, can contrib ute to membrane remodeling by increasing entropic pressure\, and paradoxica lly\, that proteins that lack a defined secondary structure\, IDPs\, may be among the most potent drivers of membrane traffic. Our ongoing work focuse s on understanding how entropic pressure influences membrane traffic\, and designing biophysical tools for manipulating receptor recycling and signali ng. LAST-MODIFIED:20161129T152018Z LOCATION:CHEM 0112 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180416T193000Z DTEND:20180416T203000Z DTSTAMP:20260828T094430Z UID:1ae6l43444i9k60rj09b37qmtl@google.com CREATED:20180403T172808Z DESCRIPTION:Speaker Name: Ellen Zweibel

Speaker I nstitution: University of Wisconsin-Madison

Title: The Basis for Cosmic Ray Feedback

Abstract: Du e to the output of energy and momentum from massive stars throughout their lives\, star formation in galaxies seems to be self limiting. The portion o f stellar energy that goes into cosmic rays seems to be an especially promi sing form of efficient feedback. I will discuss how cosmic ray feedback wor ks at the microscopic level and show examples at the macroscopic level.
 LAST-MODIFIED:20180406T201513Z LOCATION:PSC 1136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161118T180000Z DTEND:20161118T220000Z DTSTAMP:20260828T094430Z UID:9rh5394r8ov5c2ndpf79dl4ai4@google.com CREATED:20161111T153031Z DESCRIPTION:https://jsi.astro.umd.edu/upcoming-mini-symposium\n\nAbstract : 1:00 -- LUNCH\n2:00 -- Peter Bult (NASA/GSFC) -- "Connecting Periodic and Aperiodic Timing Signatures in Accreting Millisecond Pulsars"\n2:25 -- Sara Buson (NASA/GSFC) -- "The Long Trip of Gamma Rays: from the Innermost Regi ons of Blazars to the Fermi-Large Area Telescope"\n2:50 -- Joel Dahlin (NAS A/GSFC) -- "Efficient Electron Acceleration in Magnetic Reconnection"\n3:15 -- BREAK (Snacks and Beverages)\n3:45 -- Nathan Roth (UMD Astronomy) -- "D emystifying Tidal Disruption Events by Modeling their Optical Spectra"\n4:1 0 -- Leo Singer (UMD Astronomy) -- "TBA"\n4:35 -- Stephen Walker (NASA/GSFC ) -- "The Thermal History of Galaxy Clusters and Groups: from the Centre to the Edge" LAST-MODIFIED:20161111T153805Z LOCATION:2400 CSS Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium: "JSI Scientists Jamboree" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170914T140000 DTEND;TZID=America/New_York:20170914T153000 RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH DTSTAMP:20260828T094430Z UID:01ridjaq5adde9chm46676q241@google.com CREATED:20170908T131846Z DESCRIPTION:Collin Broholm\, Johns Hopkins University\n\nTitle: Incommensur ate magnetism in heavy fermion systems\n\nAbstract: Neutrons and muons were used to explore CeNiAsO and CeAuSb2. The initial instability of the heavy fermion state yields long-wavelength amplitude-modulated SDWs. Analyzing cr ystal field excitations\, we show CeNiAsO is an easy plane system. There is a lower T transition to a commensurate non-collinear state that may result from bi-quadratic interactions. CeAuSb2 is Ising like and the orthorhombic amplitude modulated state is stable to the lowest T. A B-field applied alo ng c yields an incommensurate 2-Q state. Transport anomalies indicate signi ficant modifications in electronic structure that we discuss considering th e new information about spin correlations.\n\n[1] Shan Wu and Guy Marcus ar e major contributors to this work that was supported by the U.S. Department of Energy\, Office of Basic Energy Sciences\, Division of Material Science s and Engineering under Grant No. DE-FG02-08ER46544.\n\nRefreshments are se rved at 1:30pm in the (new) Toll Room\n\nHOST: Johnpierre Paglione\n LAST-MODIFIED:20170908T132203Z LOCATION:1201 Toll Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171120T160000Z DTEND:20171120T170000Z DTSTAMP:20260828T094430Z UID:1044n5gauee0i22d93do60inqe@google.com CREATED:20170907T113006Z DESCRIPTION:Speaker: Lincoln Carr\, Mines\n\nTitle: Many-body quantum chaos of ultracold atoms in a quantum ratchet\n\nAbstract: There are now over 20 0 quantum simulators on at least 8 separate architectures with long coheren ce times and controlled dynamics. These experimental systems have generate d tremendous excitement about driven interacting quantum systems resulting in physics ranging from time crystals to dynamical many-body localization. The quantum ratchet adds a new feature to periodic driving: a preferred di rection in both time and space\, i.e.\, parity and time-reversal symmetry-b reaking. By studying weakly interacting ultracold bosons in a quantum rat chet on a ring in position\, momentum\, and Floquet representations\, we de monstrate the limits of known measures of quantum chaos in a system with a clearly defined and rather famous semiclassical or mean-field limit\, and m oreover supporting experiments. We show that the usual Wigner-Dyson statis tics used to identify chaos are smeared out as we couple non-resonant modes into the drive. In contrast\, the entropy of entanglement\, condensate de pletion\, and inverse participation ratio all serve as accurate alternate i dentifiers for the chaotic regime in which the current on the ring flip-flo ps with a positive Lyapunov exponent in the mean-field limit. The dimensio n of the strange attractor is found to depend on the local vs. global natur e of the observables. Moreover\, the growth of depletion indicates mean fi eld theory breaks down at realistic experimental times scaling polynomially as N0.18±0.004 in the chaotic regime. This study opens the door to beyond single-frequency many-body Floquet physics showing many surprises and subt leties in both the quantum many-body dynamics and the mean-field limit (or lack thereof). Our prediction of a concrete time at which depletion grows is experimentally observable via an interference experiment. The dynamics and emergent structure of higher order correlators remains an especially in triguing avenue of exploration as we find that\, contrary to oft-stated pop ular opinion\, chaos\, at least in the quantum ratchet\, does not lead to h igh entanglement.\n\nReferences:\nM. Heimsoth\, C. E. Creffield\, L. D. Car r\, and F. Sols\, "Orbital Josephson effect and interactions in driven atom condensates on a ring\," New J. Phys.\, v. 14\, p. 075023 (2012).\nM. Heim soth\, D. Hochstuhl\, C. E. Creffield\, L. D. Carr\, and F. Sols\, "Effecti ve Josephson dynamics in resonantly driven Bose-Einstein condensates\," New J. Phys.\, New J. Phys. v. 15\, p. 103006 (2013).\nMarc Andrew Valdez\, Ga vriil Shchedrin\, Martin Heimsoth\, Charles E. Creffield\, Fernando Sols\, and Lincoln D. Carr\, "Many-body Quantum Chaos and Entanglement in a Quantu m Ratchet\," Phys. Rev. Lett.\, under review (2016).\nMarc Andrew Valdez\, Gavriil Shchedrin\, Fernando Sols\, and Lincoln D. Carr\, "Layered Chaos in Mean-field and Quantum Many-body Dynamics\," to be submitted (2017).\n LAST-MODIFIED:20170907T113402Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171030T110000 DTEND;TZID=America/New_York:20171030T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171030T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Mukund Vengalattore\, Cornell\nTitle: Critical behavio r of driven dissipative transitions : Universality beyond the Markovian reg ime\nAbstract: Open quantum systems exhibit a range of novel behavior due t o the interplay between coherent dynamics and dissipation. Although these s ystems are intrinsically out of equilibrium\, they can exhibit 'driven\, di ssipative transitions' that result in the emergence of dynamical phases in novel universality classes and critical behavior that lies beyond the parad igms of equilibrium phase transitions. I will discuss our experimental real ization of such driven\, dissipative phase transitions and our studies of t he critical behavior of these systems. We find that the critical dynamics o f these systems can be profoundly altered by subjecting the system to diffe rent forms of environmental correlations\, leading not only to modified cri tical exponents but to the emergence of dynamical phases with novel broken symmetries. In particular\, I will discuss one such dynamical phase that sp ontaneously breaks a continuous time translation symmetry. I will describe our experimental studies of the phase diagram of this non-Markovian system and the critical properties of this 'time-crystalline phase'. Extending the se studies to the quantum regime\, our demonstrations of reservoir engineer ing promise to access new forms of correlated quantum behavior that do not occur in equilibrium or Markovian systems. LAST-MODIFIED:20171025T135226Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171101T150000Z DTEND:20171101T160000Z DTSTAMP:20260828T094430Z UID:1dmk5s1tgekqgp6h85el9db7to@google.com CREATED:20171025T183358Z LAST-MODIFIED:20171025T183432Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T191500Z DTEND:20180316T201500Z DTSTAMP:20260828T094430Z UID:2mcb5o1h1j36ia7ik392a571q0@google.com CREATED:20180309T161345Z DESCRIPTION:

Ri chard Schoen
Stanford and UC Irvine

Abstract : We will introduce the positive mass theorem which is a problem originatin g in general relativity\, and which turns out to be connected to important mathematical questions including the study of metrics of constant scalar cu rvature and the stability of minimal hypersurface singularities. We will th en give a general description of our recent work with S. T. Yau on resolvin g the theorem on high dimensional non-spin manifolds.

https://www-math.umd.edu/research/confe rences/geometry-week-march-12-16-2018/distinguished-lectures-in-geometric-a nalysis.html

LAST-MODIFIED:20180309T171525Z LOCATION:Kirwan Math 3206 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Lectures in Geometric Analysis: The Positive Mass The orem Revisited TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160509T200000Z DTEND:20160509T213000Z DTSTAMP:20260828T094430Z UID:nah23fffm4o2bjakuo5446nibs@google.com CREATED:20160426T170041Z DESCRIPTION:Speaker: Prof. Ian Low\n\nSpeaker Institution: Northwestern Uni versity and Argonne National Lab.\n\nTitle: Adler's Zeros and A Universal L agrangian for a PNGB Higgs\n \nAbstract: I will demonstrate an infrared con struction for the nonlinear sigma model Lagrangian based on the general cos et G/H\, by imposing nonlinear shift symmetries enforcing the Adler's zeros condition. The resulting Lagrangian only depends on how the Goldstone boso n transforms under the unbroken group H in the IR\, and is universal among all possible G in the UV. For composite Higgs models\, the construction giv es a universal Lagrangian for the symmetry-preserving part of the low-energ y effective action. LAST-MODIFIED:20160426T170041Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170915T201500Z DTEND:20170915T211500Z DTSTAMP:20260828T094430Z UID:2m8dccc5u0p7t7iornauo06sko@google.com CREATED:20170907T134552Z DESCRIPTION:Speaker: Sonika Johri\n\nAffiliation: Intel Labs\, Intel Corpor ation\, Hillsboro\, OR\n\nTitle: Entanglement spectroscopy on a quantum com puter\n\nAbstract: One important application of quantum computers is effici ently simulating many-body quantum systems. The quantum computing equivalen t of the vast array of diagnostic tools that extract information from class ical numerical simulation are still being developed. Along these lines\, we present a quantum algorithm to compute the entanglement spectrum of arbitr ary quantum states. The interesting universal part of the entanglement spec trum is typically contained in the largest eigenvalues of the density matri x which can be obtained from the lower Renyi entropies through the Newton-G irard method. Obtaining the ‘p’ largest eigenvalues (lambda_1 > lambda_2… > lambda_p) requires a parallel circuit depth of O(p(lambda_1/lambda_p)^p) a nd O(p log(N)) qubits where up to ‘p’ copies of the quantum state defined o n a Hilbert space of size ‘N’ are needed as the input. We validate this pro cedure for the entanglement spectrum of the topologically-ordered Laughlin wave function corresponding to the quantum Hall state at filling factor 1/3 . Our scaling analysis exposes the tradeoffs between time and number of qub its for obtaining the entanglement spectrum in the thermodynamic limit usin g finite-size digital quantum computers. Importantly\, we will also present results from implementing this algorithm on a digital quantum computing pl atform of trapped ion qubits to extract the second Renyi entropy of the gro und state of a 2-site Fermi-Hubbard model.\n\n*Snacks and drinks will be se rved at 4 pm* LAST-MODIFIED:20170907T134552Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180404T150000Z DTEND:20180404T160000Z DTSTAMP:20260828T094430Z UID:7i94gv9dflgng8fmiqcvn8i9hb@google.com CREATED:20180103T143607Z DESCRIPTION:Speaker: Debbie Leung

Affiliation: University of Waterlo o

Title: \;Embezzlement-based nonlocal game \;that cannot be played o ptimally with finite amount of entanglement

Abstract: \;< span style="background-color: rgb(255\, 255\, 255)\; color: rgb(34\, 34\, 3 4)\; font-family: arial\, sans-serif\; font-size: 12.8px\;">We introduce a three-player nonlocal game\, such that the optimal winning probability of 1 can only be achieved in the limit of strategies using arbitrarily high dim ensional entangled states. \; This game is explicit\, and has very few classical questions and answers. \; Our game is based on the coherent s tate exchange game introduced in arXiv:0804.4118\, which in turns is based on embezzlement of entanglement due to van Dam and Hayden. \; We discus s the main ideas behind each of these ingredients\, and how they can be put together to obtain a quantitative tradeoff in the winning probability vs t he dimension of the entangled state shared by the players. \; \;
Joint work with Zhengfeng Ji and Thomas Vidick\, arXiv:1802.04926 . \; LAST-MODIFIED:20180305T175814Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171204T210000Z DTEND:20171204T220000Z DTSTAMP:20260828T094430Z UID:71skm0nt7gffk4sg9p2g03mkhf@google.com CREATED:20171102T154313Z DESCRIPTION:Speaker Name: Bryan Spring\n\nSpeaker Institution: Northeastern University\n\nTitle: Selective treatment and imaging of cancer micrometas tases using biophysical approaches\n\nAbstract: Molecular-targeted\, activ atable probes are emerging for optical biopsy of cancer. An unexplored pote ntial clinical use of this approach is to monitor and treat residual cancer micrometastases that escape surgery and chemotherapy. This talk will intro duce a new platform for activatable phototherapy and in vivo imaging of res idual metastases that enables high-fidelity imaging and treatment of cancer cells. Optically active nanomaterials—that use light as both a drug releas e mechanism and as a cytotoxic modality—are an emerging component of this a pproach and will also be introduced. These developments stem from the cross -fertilization of biophysical imaging and quantum photophysics with cancer research. LAST-MODIFIED:20171102T154313Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180424T171500Z DTEND:20180424T181500Z DTSTAMP:20260828T094430Z UID:3pa7e2hpd20ep5ec4l80j7gq7e@google.com CREATED:20180417T133712Z DESCRIPTION:Speaker: Dr. Germano Iannacchione\, Worcester Polytechnic In stitute

Title: Raleigh-Bénard Cells as a Prototype System for Non-Equilibrium Thermodynamics

Abstract: \;Systems that are out-of-equilibrium and exhibit complex patterns are di fficult to characterize. These systems are thermodynamically open\, thereby constantly exchanging heat and matter with the surrounding. In order to be able to systematically and rigorously characterize such a system we presen t an experimental study of an out-of-equilibrium thermodynamic system\, the Rayleigh-Bénard convection cells. When a thin layer of liquid is evenly he ated from the bottom the liquid tends to self-organize into patterns of hex agonal cells or a series of rolls. The cells or rolls are an outcome of an upward flow of the hot layer of the liquid from the bottom\, and a downward flow of the cool layer of the liquid from the top along with the competing effects of viscosity and thermal gradient. The goal of this presentation i s to measure the flow of energy through the system and be able to quantify it\, along with steady state measurements of the temperature fluctuation\, entropy and internal work calculation by infrared imaging as a function of fluid viscosity and thickness over a wide range of heat input. The resultin g thermal patterns will be interpreted in terms of a balance between intern al entropy and work. The role of temperature between time-independent and s teady-state systems will be discussed. \;

LAST-MODIFIED:20180417T133750Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170607T150000Z DTEND:20170607T160000Z DTSTAMP:20260828T094430Z UID:m3nr1e01k57e9rpmst6cf7kgjc@google.com CREATED:20161212T141053Z DESCRIPTION:Speaker: Nicole Yunger Halpern\n\nSpeaker Institute: Institute for Quantum Information and Matter\, California Institute of Technology\n\n Title: Truly quantum Gibbs: Thermal state of a system whose charges don’t c ommute\n\nAbstract: The grand canonical ensemble lies at the core of statis tical mechanics. A small system thermalizes to this state while exchanging heat and particles with a bath. A quantum system may exchange quantities\, or “charges\,” represented by operators that fail to commute. Whether such a system thermalizes\, and what form the thermal state has\, concerns truly quantum thermodynamics.\n \nI characterize this state in three ways: First \, I generalize the system-and-bath microcanonical ensemble. Tracing out th e bath yields the system’s thermal state. Second\, this thermal state is ex pected to be the fixed point of typical dynamics. Finally\, the thermal sta te is completely passive (unable to output thermodynamic work) in a resourc e-theory model for thermodynamics. This study opens new avenues into equili brium in the presence of quantum noncommutation.\n \nReferences:\n \nYunger Halpern et al. Nature Communications 7\, 12051 (2016).\nThis work was cond ucted with Philippe Faist\, Jonathan Oppenheim\, and Andreas Winter. LAST-MODIFIED:20161212T141053Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170217T180000Z DTEND:20170217T190000Z DTSTAMP:20260828T094430Z UID:l5nq2bkbnkrvj0tlvjtt0titbc@google.com CREATED:20170123T201719Z DESCRIPTION:Speaker Name: Hans Robinson - Associate Prof\, Dept of Physics\ n\nSpeaker Institution: Virginia Tech\n\nTitle: Nonlinear Plasmonics\n\nAbs tract: Localized Surface Plasmon Resonances (LSPR’s) are collective electro nic resonances localized at the interface between a metal structure and its surrounding dielectric\, and they tend to dominate the optical response of noble metal nanoparticles. LSPR’s have the property that they concentrate light into nm-sized regions\, known as hot spots\, located in narrow gaps a nd on sharp corners of the nanostructures. The light intensity in a hot spo t can be many orders of magnitude higher than the intensity of the exciting light\, making them a suitable for eliciting nonlinear optical (NLO) effec ts.\n\nIn this talk\, I will discuss several experiments relating to NLO ef fects in silver and gold nanoparticles. First\, I will discuss generation o f second harmonic generation\, which have shown can be significantly enhanc ed by properly combining silver nanotriangles with a polymer with high valu es of the second order nonlinear optical susceptibility c(2). I will also d iscuss the observation of plasmonically enhanced multi-photon fluorescence seen in these nanoparticles. Finally\, I will discuss our work to use plasm onically enhanced NLO effects to control the assembly of nanoparticles into larger well-ordered constructs. This works by using inducing optically act ivated chemical reactions at the hot spots\, changing the particle surface chemistry locally\, enabling assembly akin to the way atoms assemble into l arger molecules.\n\nFor additional info\, visit:http://www.mse.umd.edu/even ts/seminars LAST-MODIFIED:20170126T193352Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180226T213000Z DTEND:20180226T223000Z DTSTAMP:20260828T094430Z UID:2q7h1h8781srflhqi7scul2ge8@google.com CREATED:20180206T002522Z DESCRIPTION:Speaker Name: Daniel Berdichevsky\n\nSpeaker Institution: NASA Goddard Space Flight Center\n\nTitle: A thermodynamics interpretation of el ectrons density and temperature description in the Sun's corona\n\nAbstract : We reach a thermodynamic interpretation to a model study of electrons den sity and temperature grounded on the physics of hydro magnetism in global e quilibrium. This is the Coronal Density and Temperature (CODET) model of th e Sun K-Corona\, see bottom sentences. The thermodynamic interpretation fin ds consistency of the model with a magneto-matter medium that is diamagneti c\, in the context of ideal magneto-hydrodynamics. To achieve the result in a quantitative way we propose that this medium possess an underlying struc ture that was earlier described to explain the adsorption process\, i.e. in this case to be a 3-D Langmuir amorphous lattice in thermodynamic equilibr ium. In this way constitutive properties of the medium magnetic permeabilit y\, the non-dispersive acoustic speed\, the expected equilibration time for the 1.1 to 1.3 solar radius region are here discussed\, which are determin ed quantitatively for a portion of the quiescent corona in a near solar min imum that extends for most of years 2008 and almost all 2009.(The CODET mod el uses as input photospheric magnetic field\, this magnetic field is extra polated through the solar atmosphere from Potential Field Source Surface (P FSS) model. Also\, a flux transport model\, an emission model and an optimi zation algorithm are used.)\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20180226T162608Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161116T210000Z DTEND:20161116T223000Z DTSTAMP:20260828T094430Z UID:k66ll6pqrs9j4ekav2km9e8nfo@google.com CREATED:20161109T212544Z DESCRIPTION:Speaker Name: Craig Dukes\n\nSpeaker Institution : University o f Virginia\n\nTitle: "Probing the Energy Frontier Using Rare Decays with Mu2e"\n\nAbstract : "The absence of any signatures for new physics at the L arge Hadron Collider in Geneva\, Switzerland has left elementary particle p hysics in a quandary. We know there is new physics out there: how to look f or it? Building accelerators of ever higher energies is prohibitively expen sive: none are on the drawing board. Hence\, in order to find out what may be lurking beyond what we can directly produce in collisions at particle ac celerators we will need to look for indirect signs such as rare and forbidd en particle decays. There is a long history of such searches\, a history th at predates particle physics itself. I will show how such searches can prob e mass scales unobtainable by direct searches at any conceivable particle a ccelerator and describe an experiment\, Mu2e\, that intends to use a novel technique to search for new physics through lepton flavor violation in muon decays with sensitivities a factor of 10\,000 over existing limits.">Probi ng the Energy Frontier using Rare Decays with Mu2e" LAST-MODIFIED:20161114T185132Z LOCATION:PSC room 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY: High Energy Physics Seminar - "Probing the Energy Frontier Using Rare Decays with Mu2e" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170310T171500Z DTEND:20170310T181500Z DTSTAMP:20260828T094430Z UID:20va9tl71o207vrb0rcupehbig@google.com CREATED:20170301T160604Z DESCRIPTION:Speaker Name: Penghui Yao\n\nSpeaker Institution: QuICS\n\nTitl e: Some recent progress on quantum information complexity\n\nAbstract: Info rmation complexity (IC) was introduced around 2000 to study communication c omplexity (CC) and it turns out to be one of the most powerful methods. Man y elegant message-compression algorithms have been discovered to compress p rotocols with low IC since then. After quantum information complexity (QIC) was defined by Touchette in 2014\, It is interesting to ask whether we ar e able to compress quantum protocols with low QIC via quantizing those clas sical message-compression algorithms. In this talk\, I will survey some rec ent results towards the direction in several different communication comple xity settings. LAST-MODIFIED:20170302T203256Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180424T160000 DTEND;TZID=America/New_York:20180424T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180424T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Smitha Vishveshwara\n\nSpeaker Institution: UIUC\ n\nTitle: Quantum Voyages\, Cosmic Journeys: Exploring Physics through th e Arts\n\n\nAbstract: From ancient monuments to modern day films\, the conf luence of the arts and physics has resulted in creations that have led to a deeper understanding of nature\, to friendly and enchanting ways of perce iving science in action\, to giving the arts a new dimension\, to technolo gical progress…and to pure fun! In this colloquium\, I will navigate throug h three interconnected\, collaborative physics-art explorations that I am c urrently involved in. A popular book in the making describes two revolution s of the past century\, Einstein’s relativity and quantum physics\, as a di alog and a personal tale. In a class entitled Where the Arts meets Physics\ , we bring alive the universe and the quantum world through installation an d performance – cosmic canopies housing black hole mergers\, raps on radioa ctivity\, Warhol versions of Bohr-Einstein debates\, and more. Collaboratio ns with theater and dance have led to creating Quantum Voyages\, an origina l performance piece\, where two voyagers led by the spirit of knowledge ent er the microscopic realm of atomic landscapes and quantum conundrums. I wi ll share the process behind the making and fresh footage of last month’s pr emier of Quantum Voyages. \nHosted by: Jay Deep Sau LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171108T160000Z DTEND:20171108T170000Z DTSTAMP:20260828T094430Z UID:19fogdr6b3do6gd46fll1voe36@google.com CREATED:20171102T154649Z LAST-MODIFIED:20171102T154649Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171203T000000Z DTEND:20171203T013000Z DTSTAMP:20260828T094430Z UID:68hhpiu38ie77jhh0v0am3tcs4@google.com CREATED:20170925T133718Z DESCRIPTION:Physics is Phun Community Event\nProgram offered both Friday 12 /1 and Saturday 12/2 at 7:00 pm.\n\nhttps://umdphysics.umd.edu/events/about us-outreach/physics-is-phun.html\n\nFor information: lecdemo_outreach@physi cs.umd.edu LAST-MODIFIED:20170925T175852Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Modern Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171113T200000Z DTEND:20171113T213000Z DTSTAMP:20260828T094430Z UID:4m26r71rp26m4nae5kjtgrkcrm@google.com CREATED:20171106T162148Z DESCRIPTION:Speaker: Eder Izaguirre\n\nSpeaker Institution: Brookhaven Nati onal Laboratory\n\nTitle: Illuminating a Dark Sector at Low Energy Experime nt\n \nAbstract: I discuss recent developments in probing fundamental physi cs with small-scale\, low energy\, high intensity facilities. I will focus on new ideas for probing a well-motivated class of light Dark Matter models . LAST-MODIFIED:20171106T162148Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180925T171500Z DTEND:20180925T181500Z DTSTAMP:20260828T094430Z UID:3rckc8hlagv2on7e60fv27a97j@google.com CREATED:20180905T131616Z DESCRIPTION:Speaker: Maicol Ochoa\, National Institute of Standards and Tec hnology

Title: Quantum Effects on the Thermodynamics of Nanoscale En gines

Abstract: Nanoscale fabrication techniques and modern s ingle molecule spectroscopies provide tools for the design\, control and st udy of systems made up of just a few atoms\, significantly far from the the rmodynamic limit. In this regime\, both thermal and quantum mechanical fluc tuations are essential and cannot be neglected. A complete description of n anoscale and molecular engines must\, therefore\, account for these effects in the characterization of their thermodynamic properties. During my ta lk\, I will introduce the concepts and techniques that we have developed to investigate the interplay between quantum dynamics and thermodynamic effic iency in nanoscale systems. As an illustration\, I will describe model sys tems for nanoscale thermoelectric devices\, electronic rectifiers\, and mol ecular photocells. \; LAST-MODIFIED:20180921T140218Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170316T163000Z DTEND:20170316T173000Z DTSTAMP:20260828T094430Z UID:salpibgt5nd0d4s4ahk9678c3c@google.com CREATED:20170313T154752Z DESCRIPTION:PHYS 798E and ENEE 698D\nTitle: Acceleration of Protons and El ectrons using Intense Laser Beams \nSpeaker: Phillip Sprangle\, ECE\, Physi cs and IREAP\, U of Md.\n\nAbstract: This talk will cover laser acceleratio n of protons and electrons. In particular the topics include\, i) accelera tion of protons in a low phase velocity plasma wave and ii) the acceleratio n of electrons in vacuum. For example\, we propose a mechanism to accelera te protons in a shock-excited low phase velocity plasma wave by interacting two counter-propagating laser pulses in a plasma. The laser pulses consis t of a forward-propagating short pulse and a counter-propagating long pulse . The beating of these laser pulses generate a slow forward-propagating pl asma wave that can trap and accelerate protons. The trapping and accelerat ion of the protons is accomplished by appropriately tapering both the plasm a density and the amplitude of the backward-propagating pulse. In addition \, the electron acceleration mechanisms that will be discussed include the: a) cyclotron auto-resonance\, b) laser beat wave\, c) Cherenkov and d) inv erse free electron laser. Electron acceleration and coherent radiation gen erated are closely related inverse processes. \n\nBIO: Professor of Electr ical & Computer Engineering\, Physics and IREAP at the University of Maryla nd. His research covers a wide range of fields and includes the atmospheri c propagation of high-energy lasers\, laser driven accelerators\, ultra-sho rt pulse laser matter interaction and propagation\, nonlinear optics and fr ee electron lasers. He is a fellow of the OSA\, APS\, IEEE and DEPS. He i s winner of the Presidential Rank Award (2015)\, Advanced Accelerator Conce pt Prize (2014)\, James Clerk Maxwell Prize (2013)\, Fred E. Saalfeld Award (2012)\, Navy Meritorious Civilian Service Award (2011)\, IEEE Plasma Scie nce Award (2008)\, Sigma Xi Pure Science Award\, (1994)\, International Fre e Electron Laser Prize (1991)\, E.O. Hulburt Science and Engineering Award (1986)\, two Technology Transfer Awards (1995\, 2004)\, as well as the Top Navy Scientist and Engineer of the Year Award (2008). He has published ove r 300 refereed scientific articles\, and holds 18 U.S. Patents and 2 pendin g. \n\n\n LAST-MODIFIED:20170313T154752Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170509T150000Z DTEND:20170509T161500Z DTSTAMP:20260828T094430Z UID:829d5p62u8pc73tot4pcjd2mr0@google.com CREATED:20170324T133715Z DESCRIPTION:Speaker: John Imbrie (UVA)\n\nTitle: Many-Body Localization: St ability and Instability\n\nAbstract: In recent years\, substantial theoreti cal\, experimental\, and numerical work has been under way\, with a goal of understanding the many-body analog of Anderson localization. Remarkably\, even in presence of interactions and at finite energy density\, disordered quantum systems can remain permanently out-of-equilibrium. Many-body locali zation (MBL) can be understood in terms of an extensive set of non-trivial conservation laws. We describe a non-perturbative construction of local int egrals of motion (LIOMs) for a weakly interacting spin chain\, under a phys ically reasonable assumption on the statistics of eigenvalues. The analysis elucidates how rare regions with weak disorder (Griffiths regions) have th e potential to spoil the MBL phase. We discuss ideas about the situation in higher dimensions\, where one can no longer ensure that interactions invol ving the Griffiths regions are much smaller than the typical energy-level s pacing for such regions. We argue that ergodicity is restored in dimension d > 1\, although equilibration should be extremely slow\, not unlike the dy namics of glasses.\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Dong-Ling Deng\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170424T192439Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171106T110000 DTEND;TZID=America/New_York:20171106T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20171106T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Rembert Duine\nTitle: Magnetic insulator spintronics: from magnon spin currents to black holes\nAbstract: Magnons are the bosonic quanta of spin waves - oscillations in the magnetization direction in magn ets. In this talk I will discuss recent developments in spintronics that co ncern magnon spin transport through magnetic insulators. In particular\, I will focus on nanostructures that consist of magnetic insulators coupled to metallic reservoirs. These act as injectors and detectors of spin currents . After reviewing recent experimental results\, e.g. on room-temperature lo ng-distance spin transport\, I will outline our current theoretical underst anding of these systems. Based on this\, I will discuss theoretical predict ions for superfluid spin transport\, topological spin transport\, and spin transport in magnonic Mott insulators. Finally\, I will outline our proposa l for implementing black-hole horizons for magnons. LAST-MODIFIED:20171030T162853Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171130T190000Z DTEND:20171130T203000Z DTSTAMP:20260828T094430Z UID:4l3ra7rno4elsjtlqudmm1bdq7@google.com CREATED:20170908T211104Z DESCRIPTION:SPEAKER: Martin Sandberg\, IBM\n\nTITLE: Multi Qubit Quantum P rocessors and the IBM Quantum Experience\n\nABSTRACT: In this talk I will present a general overview of the quantum computing efforts at IBM. Hinging on the development of high-quality superconducting quantum processors\, IB M is aiming at building an ecosystem for quantum computing through the Quan tum Experience. By providing cloud based access to real quantum hardware we hope to sprue interest and accelerate the development of quantum computing . Although the goal of a fault tolerant universal quantum computer is still far away\, quantum computers might have an impact on certain problems (suc h as quantum chemistry) on a much shorter time scale through approximate qu antum computing. I will present our recently released 16 qubit processor an d will discuss on some of the challenges related to building a multi-qubit platform using superconducting hardware\, such as gate fidelities and deali ng with crosstalk.\n\nHOST: Fred Wellstood\n LAST-MODIFIED:20171127T021024Z LOCATION:room 1201\; John S Toll Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Martin Sandberg\, IBM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160512T123000 DTEND;TZID=America/New_York:20160512T133000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8_R20160421T163000@google.com RECURRENCE-ID;TZID=America/New_York:20160512T123000 CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Padi Boyd\n\nSpeaker Institution: NASA\, Goddard Space Flight Center\n\nTitle: X-ray Binary Light Curves: Can Data Analysis Lead to a Dynamical Model of Long Term Variability?\n\nAbstract:The Time D omain Astronomy (TDA) renaissance is already well underway. The K2 mission is amassing an impressive collection of high precision\, evenly sampled\, l ong time baseline optical observations on par with those from the original Kepler mission\, and high-energy space-based all-sky monitors continue to w atch virtually every bright X-ray source in the sky. These facilities mon itor accreting compact binaries: some show high-amplitude “superorbital†variability\, on timescales longer than the orbital timescale\, sometimes ascribed to the motion of a warped\, precessing accretion disk. Warped ac cretion disks appear to be important in many astrophysical environments\, f rom planet formation to accreting supermassive black holes at the hearts of active galaxies. But even the most well-behaved X-ray binary sources show surprising deviations from strictly periodic variability. This talk will e xplore the variety of non-periodic variations seen in these systems\, and s ome of the analysis tools used beyond traditional power spectral analysis\, which is often insufficient. Such tools include phase-space embedding and topological analysis used by some in the nonlinear dynamics community. As t he time baseline grows\, these tools become more powerful\, giving us hints about what drives such variability. I hope to get you thinking and comment ing about whether a recently proposed accretion disk dynamo model might be able to explain the double-well-potential-like behavior seen in some system s\; thus taking the next steps in understanding the dynamics of accretion d isks. LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160526T190000Z DTEND:20160526T203000Z DTSTAMP:20260828T094430Z UID:hlu9821jica27q87pf16co6u94@google.com CREATED:20160519T151552Z DESCRIPTION:**Time to be confirmed**\n\nSpeaker: Mikhail Shifman\n\nSpeaker Institution: University of Minnesota\n\nTitle: Can QCD Support Unknown Sym metry?\n\nAbstract: I discuss "truncated" QCD suggested recently by Glozman et al. For two flavors it was observed that truncation restores the full c hiral U(2)xU(2) symmetry of the Lagrangian. Moreover\, additional enhanceme nt of the above symmetry connecting representations with distinct Lorentz s pins was observed. I argue that the chiral symmetry restoration in a confin ing theory could entail emergent (extra) dynamical flavors which would show up in the spectrum of color-singlet particles. As an example\, I consider truncated QCD with a single massless Dirac quark. Assuming the validity of "truncated” QCD I demonstrate how a dynamical SU(2)_{fl} symmetry could em erge for massive spin-1 mesons in QCD with one quark flavor. LAST-MODIFIED:20160520T194722Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear and Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161001T140000Z DTEND:20161001T160000Z DTSTAMP:20260828T094430Z UID:kk1bl2dtpvq84noarks5dm2s50@google.com CREATED:20160926T195359Z DESCRIPTION:Speaker: Tom Cohen\n What does a nuclear physicist actually do? \nThis talk will focus on some of the big issues driving modern research in nuclear physics.\n\n Illustrative examples will be taken from nuclear astr ophysics\, the physics of nuclear matter under extremes of temperature\, th e structure of nuclei and the use of nuclear physics as a laboratory to pro be fundamental symmetries. \n\nThe talk will emphasize what nuclear physic ists--both experimentalists and theorists--actually do.\n\nhttps://sites.go ogle.com/a/physics.umd.edu/saturday-morning-physics/home LAST-MODIFIED:20160926T200733Z LOCATION:Lecture Hall 1410\, John S. Toll Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Saturday Morning Physics: What does a nuclear physicist actually do ? TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20161110T190000Z DTEND:20161110T203000Z DTSTAMP:20260828T094430Z UID:r76amtehjtr02h16go462oe1hg@google.com CREATED:20161027T131311Z DESCRIPTION:Speaker: Prof. Bei-Lok Hu\, UMD\n\nTitle: Nonequilibrium Steady States of Quantum Many-Body Systems: Heat Transport and “Hot Entanglement” \n\nAbstract: Stationary states play a specially important role for nonequi librium systems (NESS) as equilibrium states in canonical ensembles for sta tistical mechanics. Existence and uniqueness of a NESS for classical many b ody systems is a main theme of research by mathematical physicists for deca des [1]. Answering this question for quantum many-body systems poses a majo r challenge for the present. While mathematical proofs of theorems for thes e basic issues are of great importance\, being able to follow how these qua ntum systems evolve in time explicitly provides additional insights into it s nonequilibrium properties. In a recent work [2] we use functional methods [2] to derive the quantum stochastic equations (master\, Langevin\, Fokker -Planck) for a prototypical quantum open system -- a harmonic chain in cont act with two heat baths -- and by examining the energy flux relations in th e open system\, show the existence of NESS at late times. The functional me thod when combined with perturbative techniques can be used to explore quan tum transport problems in nonlinear systems [3][4].\nAs an application\, a topic in quantum thermodynamics of theoretical interest and relevant to qua ntum information processing is “hot entanglement” [5] -- whether quantum ta nglement can be maintained up to some high temperature. Galve et al [6] sho w that entanglement can be kept to a high temperature if the intra-system c oupling is parametrically driven. To discern the true physical causes of a system’s ability to sustain quantum entanglement at high temperatures we be gin with two generic cases where the coupling between the two oscillators i n the system is a constant: A model system S of two coupled oscillators int eracting 1) with a common thermal bath [7] and 2) when each oscillator is c oupled to its own bath\, but kept at different temperatures [8]. The differ ence is that after S is fully relaxed\, assuming weak coupling with the bat h(s)\, the quantum system in Case 1 approaches thermal equilibrium\, while in Case 2 approaches a nonequilibrium steady state (NESS). The entanglement behaviors in these systems are found to be very different. At high tempera tures\, in both cases\, entanglement in systems with constant coupling are shown to be insignificant. Entanglement in quantum driven systems may diffe r. LAST-MODIFIED:20161027T131311Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMCP-UMBC Seminars on Quantum Thermodynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170222T210000Z DTEND:20170222T220000Z DTSTAMP:20260828T094430Z UID:bi6gos61tkoldght6dqbrlsmgc@google.com CREATED:20170214T194909Z DESCRIPTION:Speaker Name: Dr. Alfred Mallet\n\nSpeaker Institution : Univer sity of New Hampshire\n\nAbstract : On length scales larger than the ion gy roradius\, the turbulence in a plasma with a strong mean magnetic field may be modelled using the equations of reduced magnetohydrodynamics\, which de scribe the evolution of Alfvenic fluctuations propagating up and down the m agnetic field. This (strongly nonlinear) turbulence is \n(i) anisotropic wi th respect to the direction of the local mean magnetic field - a steeper sp ectral index (for example) in the parallel direction compared to the perpen dicular.\n(ii) "aligned" - vector fluctuations in the fields in the perpend icular plane point in the same direction to within a small angle.\n(iii) hi ghly intermittent - the shape of the probability distributions of many (but not all!) turbulent quantities depends on scale in a non-trivial way.\nI w ill discuss the work we have performed connecting these phenomena\, and the resulting statistical model for the Alfvenic turbulence we have developed. LAST-MODIFIED:20170214T195023Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160518T150000Z DTEND:20160518T160000Z DTSTAMP:20260828T094430Z UID:or2t75prggo9sqqt9kpadnieqk@google.com CLASS:PUBLIC CREATED:20160509T132524Z DESCRIPTION:Title: Microwave Electrometry with Rydberg Atoms in Vapor Cells \n\nSpeaker: Haoquan Fan\, University of Oklahoma\n\nAbstract: In this talk \, I will present an atom-based method to detect absolute microwave (MW) el ectric fields (E-fields) which uses Rydberg atoms at room temperature in va por cells. The method utilizes a bright resonance prepared within an electr omagnetically induced transparency window. The large transition dipole mome nts between energetically adjacent Rydberg states enable this method to per form traceable E-field measurements with a sensitivity that is several orde rs of magnitude higher than the current standard for MW E-fields. The Rydbe rg atom-based method is promising to be a new standard of MW E-field measur ements and to develop into portable devices for applications of MW technolo gies. LAST-MODIFIED:20160509T132524Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171107T181500Z DTEND:20171107T191500Z DTSTAMP:20260828T094430Z UID:649phfbv25sm3v2tpiigp50g0t@google.com CREATED:20170912T134743Z DESCRIPTION:Speaker: Professor Royce Zia\, Virginia Tech\n\nTitle: Prominen t and Subtle Manifestations of Persistent Probability Currents in Non-equil ibrium Steady States\n\nAbstract: For many interesting phenomena in nature\ , from all life forms to the global climate\, the fundamental hypothesis of equilibrium statistical mechanics does not apply. Instead\, they are perha ps better characterized by non-equilibrium steady states (NESS)\, evolving with dynamical rules which violate detailed balance and time reversal symme try. In particular\, such dynamics leads to the existence of non-trivial\, persistent probability currents - a principal characteristic of NESS. In tu rn\, these give rise to the notion of "probability angular momentum". Obser vable consequences of such abstract concepts will be illustrated in the con text of simple pedagogical examples\, showing both obvious and obscure mani festations. Applications to other systems\, from tractable models of opinio n formation to the complex behavior in our ocean heat content\, will also b e presented. LAST-MODIFIED:20170912T134743Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20180112 DTEND;VALUE=DATE:20180113 DTSTAMP:20260828T094430Z UID:4e8q6ua7p433jbor2f0hkf46jo@google.com CREATED:20180103T212958Z DESCRIPTION:Workshop: Friday\, Jan. 12\, 2018\, "The Hotel" at the Universi ty of Maryland\, College Park\, MD\n\nThe FQM Workshop\, following the scho ol event\, will cover both experimental and theoretical research on quantum materials\, focusing on synthesis\, characterization and computational app roaches to research of quantum materials such as superconductors\, strongly correlated electron systems and topological materials.\n\nhttps://fqm.phys ics.umd.edu/ LAST-MODIFIED:20180104T200238Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:FQM Workshop TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20181107T160000Z DTEND:20181107T170000Z DTSTAMP:20260828T094430Z UID:5ac0ko1r73q5bbafplh5pjc0v4@google.com CREATED:20180905T135454Z DESCRIPTION:Speaker: Dan Jovinelli\, Graduate Student Literature Seminar \, UMCP

Title: TBA LAST-MODIFIED:20180905T135500Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171020T230000Z DTEND:20171021T003000Z DTSTAMP:20260828T094430Z UID:3ivohvaiobg4p2jj5qbviba9vb@google.com CREATED:20170913T142523Z DESCRIPTION:Explore the science of motion and Newton's Laws at Physics is P hun\, UMD Physics' free public demonstration program. Program offered both Friday 10/20 and Saturday 10/21 at 7:00 pm.\n\nhttps://umdphysics.umd.edu/e vents/aboutus-outreach/physics-is-phun.html\n\nFor information: lecdemo_out reach@physics.umd.edu LAST-MODIFIED:20170918T151021Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: The World in Motion TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171201T211500Z DTEND:20171201T221500Z DTSTAMP:20260828T094430Z UID:054mbg7t6o9dfcho9ss1lft3h9@google.com CREATED:20171122T142502Z DESCRIPTION:Speaker: Yen-Hsiang Lin\n\nAffiliation: JQI\n\nTitle: Engineeri ng selection rules of transitions in a multi-level fluxonium superconductin g artificial atom\n\nAbstract: A Fluxonium artificial atom is a multi-level system with tunable transition dipole\, which allows us to engineer select ions rules of transitions. In this talk will demonstrate measurements of th e energy decay time T1 in a specially designed fluxonium circuit as a funct ion of its flux-tunable transition dipole. Remarkably\, T1 grew by two orde rs of magnitude proportionally to the inverse transition dipole squared and reached values above 2 ms without signs of saturation. This is the first t ime demonstrated a hardware-level protection of a superconducting qubit aga inst bit-flip errors. I will also demonstrate a fluorescence "shelving" rea dout scheme of atomic physics applied to a fluxonium artificial atom. In th is scheme\, the short-lived readout transition is tuned in the passband of a 3D waveguide while the long-lived qubit transition is below the waveguide ’s cutoff frequency. The state of qubit can be measured by measuring reflec tion coefficient at frequency of readout transition. Such device can also s erve as a tool to characterize and optimize thermalization of the measureme nt lines in superconducting qubit experiments. \n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171122T142502Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180328T193000Z DTEND:20180328T203000Z DTSTAMP:20260828T094430Z UID:4lotcd962r7oklsq2mcoplcguq@google.com CREATED:20180322T144940Z DESCRIPTION:Sp eaker Name: Dr. Caoxiang Zhu

Speaker Institution : Princeton Plasma Physics Laboratory


Title : Development of the FOCUS code for designing stellarator coils



Abstract : Finding an easy-to-build coil set has been a critical issue for stellarator design for decades. Conventional approaches assume a toroidal `winding' surface. We present a new method to design stellarator coils. The new coil design co de\, FOCUS\, represents coils as arbitrary\, closed\, one-dimensional curve s embedded in three-dimensional space. The target function to be minimized consists of multiple physical requirements and engineering constraints. By differentiating the first and second order derivatives of the target functi on with respect to coil parameters\, FOCUS uses gradient-based and Hessian- based minimization algorithms to optimize the coils\, fast and robustly. FO CUS has been applied to design modular/helical/RMP coils for stellarator an d tokamak configurations. With analytically calculated Hessian\, FOCUS can also use the eigenvalues of the Hessian matrix for determining the error fi eld sensitivity to coil deviations. The sensitivities could provide informa tion to avoid dominant coil misalignments and simplify coil designs for ste llarators. \;


 LAST-MODIFIED:20180322T145042Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160915T163000Z DTEND:20160915T173000Z DTSTAMP:20260828T094430Z UID:14l6sbo3jgivgq08k82erv4ru8@google.com CREATED:20160908T171331Z DESCRIPTION:Speaker Name: Naeem Masnadi\n\nSpeaker Institution : Univeristy of Maryland| Mechanical Engineering\n\nNotes: Title: On the Generation of Gravity-Capillary Solitary Waves in Deep Water\n\nAbstract : Abstract: Nonl inear solitary waves are known to bifurcate from linear sinusoidal waves in deep water at the minimum phase speed of linear gravity-capillary waves (c _min=23 cm/s). This minimum happens at a finite wavenumber and the solitary waves can be viewed as modulated wavepackets with the wave envelope moving at the same speed as the wave crests. The minimum phase speed is also asso ciated with a resonant condition\; the linear response to a surface pressur e distribution moving at this speed becomes unbounded. The nonlinear respon se offers rich and complicated dynamics and several solution regimes are fo und due to a delicate interplay between the effects of nonlinearity\, dispe rsion and viscous dissipation. I will first review some theoretical backgro und and modeling approaches to the problem of the response of a water surfa ce to a pressure source moving at speeds close to c_min and then present ou r recent experimental and numerical findings. LAST-MODIFIED:20160908T173007Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170308T200000Z DTEND:20170308T210000Z DTSTAMP:20260828T094430Z UID:pfna394gd0c8dpclvnjbnb6rb4@google.com CREATED:20170301T161858Z DESCRIPTION:Speaker Name: Prof. Javad Shabani\n\nSpeaker Institution : City College of New York\n\nTitle : Two-dimensional epitaxial superconductor-se miconductor heterostructures: A platform for topological superconducting ne tworks\n\nAbstract : Progress in the emergent field of topological supercon ductivity relies on synthesis of new material combining superconductivity\, low density\, and spin-orbit coupling. Recently\, epitaxial growth of Al o n InAs nanowires was shown to yield a high quality superconductor-semicondu ctor (S-Sm) system with uniformly transparent interfaces and a hard induced gap\, indicted by strongly suppressed subgap tunneling conductance. Here w e report the realization of a two-dimensional (2D) InAs/InGaAs heterostruct ure with epitaxial Al\, yielding a planar S-Sm system with structural and t ransport characteristics as good as the epitaxial wires. The realization of 2D epitaxial S-Sm systems represent a significant advance over wires\, all owing extended networks via top-down processing. Among numerous potential a pplications\, this new material system can serve as a platform for complex networks of topological superconductors with gate-controlled junctions. We demonstrate gateable Josephson junctions and a highly transparent 2D S-Sm i nterface based on the product of excess current and normal state resistance . LAST-MODIFIED:20170301T162017Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180409T200000Z DTEND:20180409T210000Z DTSTAMP:20260828T094430Z UID:1av4tu2fup23t80e4k9e4l3eae@google.com CREATED:20180312T151513Z DESCRIPTION:Speaker Name: Gevorg Grigoryan

Speake r Institution : Dartmouth College

Title: \; \;< /span>Tertiary Alphabet for the Observable Structural Universe

Abstract : Understanding how amino-acid sequence encodes prot ein structure is a grand challenge of modern biophysics. Chief among the di fficulties of describing this sequence-structure mapping is that the space of structural possibilities is immense and complex. We propose that this sp ace should nevertheless be describable as a combination of discrete local s tructural patterns. We introduce the concept of a TERM (tertiary motif)\, w hich encapsulates the full structural environment around a given residue\, and show that the protein structural universe is highly degenerate at the l evel of TERMs. In fact\, only 650 TERMs describe over 50% of the structural database at sub-Angstrom resolution. We go on to show that such degeneracy enables the direct quantification of sequence-structure relationships. Loc al sequence models can be extracted for each TERM contained in a protein st ructure\, based on the many occurrences of the TERM in unrelated proteins\, with the overall protein structure described as a combination of these mod els. We have begun to demonstrate the broad applicability of such a framewo rk: 1) protein design: we have fully redesigned (and validated) protein sur faces using TERM data alone\; 2) structure prediction: we found that TERM-b ased sequence statistics identify accurate models\; 3) we have shown that m utational stability changes are predicted quantitatively from TERM data alo ne. Earlier findings of degeneracies in the protein structure (e.g.\, for s econdary and super-secondary motifs)\, have greatly advanced computational structural biology. TERM-based mining of structural data is the next logica l step that should provide further quantitative insights into sequence-stru ctural relationships.
 LAST-MODIFIED:20180403T143808Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171128T190000Z DTEND:20171128T203000Z DTSTAMP:20260828T094430Z UID:0b15djdqe89b8bd21g8hc6ppof@google.com CREATED:20171120T150039Z DESCRIPTION:Speaker Name: Philip Harris\n\nSpeaker Institution: MIT\n\nTitl e: "The Vicissitudes of Dark Matter at the LHC"\n\nAbstract : Development s over the past year have demonstrated the power of the LHC to compliment a nd\, in some cases\, extend direct detection and galactic searches for dark matter. We present a series of new searches for dark matter that represent s the culmination of these developments. In addition to an order of magnitu de improvement in sensitivity to dark matter\, we discuss the impact of the se searches on our understanding of electroweak boson production. Finally\, we explore the future of dark matter searches. We consider a new class of searches using hadronically decaying bosons discussing new and we discuss t he future implications on dark matter and\, more broadly\, hidden sectors. Can we make a definitive path to dark matter discovery?\n\nSeminar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm. Times are tentative. LAST-MODIFIED:20171120T202622Z LOCATION:PSC room 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Joint UMD/JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180307T160000Z DTEND:20180307T170000Z DTSTAMP:20260828T094430Z UID:0mfkj1mufv91bu23dr9n6tto5q@google.com CREATED:20180207T193224Z DESCRIPTION:


Speaker: Christian Majenz \;

Affiliation : CWI\, Netherlands

Title: Asymptotic performance of port-based tele portation \;



Abstract: Port-based teleportation (PBT) is a variant of the well-known task of quantum teleportation where the rec eiver Bob\, instead of having to apply a non-trivial correction unitary\, m erely has to pick up the right quantum system at a “port” specified by the classical message he received from Alice. While much more resource-demandin g than standard teleportation\, PBT has applications to instantaneous non-l ocal computation and can be used to attack position-based quantum cryptogra phy. A perfect PBT protocol would violate the linearity of quantum theory\, so there is a trade-off between error and entanglement consumption (or the number of ports) which can be analyzed using representation theory of the symmetric and unitary groups. In particular the resource state has a “purif ied" Schur-Weyl duality symmetry. I will give an introduction to the task o f PBT and its symmetries\, and show how the asymptotics of existing formula s for the optimal performance for a given number of ports can be derived us ing a connection between representation theory and the random matrix ensemb le GUE_0.

LAST-MODIFIED:20180220T204156Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160418T200000Z DTEND:20160418T210000Z DTSTAMP:20260828T094430Z UID:8a6ubmnn6a9mg5r3kjmstn4c9s@google.com CREATED:20160411T182920Z DESCRIPTION:Speaker: K. S. Babu\n\nSpeaker Institution: Oklahoma State Univ ersity\n\nTitle: Flavor Physics and Unification\n \nAbstract: A novel attem pt to understand the flavor puzzle (hierarchical fermion masses\, disparate flavor mixings in the quark and lepton sectors\, etc) in the context of un ified theories will be presented. A key new feature is the absence of the fundamental Higgs in SO(10)\, which is replaced by a vector-like fermion fa mily. I shall also discuss flavor unification near the TeV scale based on a maximal subgroup of the flavor symmetry group\, along with its implicatio ns for LHC searches. LAST-MODIFIED:20160411T182921Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180404T173000Z DTEND:20180404T190000Z DTSTAMP:20260828T094430Z UID:0e0vbsnk6sc7rnvrusbha2ptia@google.com CREATED:20180202T195008Z DESCRIPTION:Speaker: Professor Chuan Liu\n \nSpeaker Institution: Peking Un iversity\n \nTitle: Recent lattice results on the XYZ states\n\nAbstract: I will briefly review lattice spectroscopy studies\non the exotic hadronic s tructures\, called the XYZ states\, that have\nbeen discovered in recent ye ars. LAST-MODIFIED:20180329T172017Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180601T230000Z DTEND:20180602T003000Z DTSTAMP:20260828T094430Z UID:2v3vces709ri3t18nllb49ke05@google.com CREATED:20180517T174158Z DESCRIPTION:Physics is Phun Community Event
Program offered both Friday 6/1 and Saturday 6/2 at 7:00 pm.

https://umdphysics.umd.edu/events/aboutus -outreach/physics-is-phun.html

For information: lecdemo_outreach@physics. umd.edu LAST-MODIFIED:20180517T174158Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Full Spectrum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161220T150000Z DTEND:20161220T230000Z DTSTAMP:20260828T094430Z UID:tqu3i5rb7igsung0lkskhl1a6k@google.com CREATED:20161221T142047Z DESCRIPTION:https://www.youtube.com/watch?v=JaGwetwUHJg LAST-MODIFIED:20161221T142047Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Campus commencement video TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180910T200000Z DTEND:20180910T210000Z DTSTAMP:20260828T094430Z UID:3t1v01159vf6kpb5g0c7vdsbf6@google.com CREATED:20180907T121159Z DESCRIPTION:Speaker: Yun Suk Eo\n\nTitle: What we understand and don’t unde rstand about Samarium hexaboride from electrical transport\n\nAbstract:\n\n Topological insulators (TIs) are a subject of recent interest in the conden sed matter community due to their unusual electronic properties. Physically \, TIs are characterized by the presence of protected metallic surface stat es located within the bulk gap that is manifested at low temperatures. One of the TI candidates is samarium hexaboride (SmB6)\, which is especially in triguing because it may be the first strongly correlated TI. It has been se veral years now since the first experimental report that the conducting sur face indeed exists\, but its properties are still not well known and the no n-trivial nature is under debate. In addition\, a recent de-Haas van Alphen quantum oscillation reports that an exotic Fermi surface exists in the ele ctrically insulating bulk of SmB6. In my talk\, I will briefly review the r ecent progress of the study of SmB6\, specifically from the electrical tran sport (in the dc limit) perspective. Then\, I will introduce a new way to m easure the bulk resistivity of SmB6 in the presence of strong surface condu ction at low temperatures (below 4K) using a non-local transport method. Cu rrently\, the bulk resistivity at low temperatures is being studied using t his technique\, and it allows us to study the role of disorder in the bulk. Our results so far show that the bulk resistivity behaves almost like an i deal insulator or an intrinsic semiconductor as if no impurity states in th e gap are present. In addition\, some of the samples show a small bulk cond uction at low temperatures after a very large increase of bulk resistivity. The origin is still not clear yet. Possible scenarios will be discussed in my talk. LAST-MODIFIED:20180907T121159Z LOCATION:John S Toll Bldg\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180713T193000Z DTEND:20180713T210000Z DTSTAMP:20260828T094430Z UID:3fonqr9qg52omqokfe75949gr6@google.com CREATED:20180709T155526Z DESCRIPTION:\nSpeaker Name: Daniel Carney\n\nSpeaker Institution: QuICS\n\n Title: Quantum information for gravity and high energy physics\n\nAbstract: I will outline some general ideas about how quantum information science ca n inform traditional high energy and (quantum) gravitational physics. At a theoretical level\, I will discuss ways in which information theoretic idea s have been used to learn about quantum field theory and gravity. On a more experimental note\, there will be some discussion about techniques commonl y used in information science--quantum optics\, interferometry\, opto/elect romechanics\, etc.-- and their potential use to study fundamental physics.\ n\nNotes: Food and beverages served after the talk. LAST-MODIFIED:20180709T155526Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI summer school TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170426T180000Z DTEND:20170426T193000Z DTSTAMP:20260828T094430Z UID:jk8tsncpfahqovigqofvpl6tjo@google.com CREATED:20170410T171055Z DESCRIPTION:Speaker: Yong Zhao\n\nSpeaker Institution: MIT\n\nTitle: Gluon Polarization in the Proton from Lattice QCD\n\nAbstract: The gluon polariza tion contribution to the proton spin is calculated for the first time from lattice QCD. Though defined to be a time-dependent observable in the infini te momentum frame\, the gluon polarization can be calculated on a Euclidean lattice with the large momentum effective theory. This calculation is car ried out with valence overlap fermions on 2+1 flavor domain-wall fermion ga uge configurations on four lattice spacings and four volumes including an e nsemble with physical values for the quark masses. The result shows that th e gluon polarization accounts for about one half of the proton spin\, which is in line with recent RHIC data analysis. LAST-MODIFIED:20170417T123318Z LOCATION:PSC 3150 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170728T170000Z DTEND:20170728T180000Z DTSTAMP:20260828T094430Z UID:fo9pg85are1mufq1hd262guhpk@google.com CREATED:20170724T135716Z DESCRIPTION:Speaker: Kavan Modi\n\nSpeaker Affiliation: Monash University\n \nTitle: Full and efficient characterisation of non-Markovian quantum proce sses\n\nAbstract: In science\, we often want to characterise dynamical proc esses to identify the underlying physics and predict the future states of t he system. If the state of the system at any time depends only on the state of the system at the previous time-step and some predetermined rule then t he dynamics are characterised with relative ease. For instance\, the dynami cs of quantum mechanical systems in isolation is described in this way. How ever\, when a quantum system repeatedly interact with an environment\, the environment often ’remembers’ information about the system's past. This lea ds to non-Markovian processes\, which depend nontrivially on the state of t he system at all times during its evolution. Such dynamics are not\, in gen eral\, be easily characterised using conventional techniques. Indeed\, sinc e the early days of quantum mechanics it has been a challenge to describe n on-Markovian processes. Here we will show\, using operational tools from qu antum information theory\, how to fully characterise any non-Markovian proc ess. Using this we give an unambiguous criteria for quantum Markov processe s. Next\, we construct a mapping from a multi-time process to a many-body s tate using linear (in the number of time steps) amount of bipartite entangl ement. The many-body state can be measured to any desired precision\, thus the process can be characterised to any desired precision. LAST-MODIFIED:20170724T135732Z LOCATION:CSS 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170410T200000Z DTEND:20170410T213000Z DTSTAMP:20260828T094430Z UID:l4q7pjqt5ucduf296l4c673ps0@google.com CREATED:20170330T175327Z DESCRIPTION:Speaker: Sam McDermott\n\nSpeaker Institution: YITP Stony Brook University \n\nTitle: Supernova Constraints on Dark Sectors\n \nAbstract: Supernova 1987A created an environment of extremely high temperatures and n ucleon densities. The rough agreement between predictions of core collapse models and observations of a "neutrino burst" provide an opportunity to set bounds on a wide range of theories of new physics. We present new bounds o n dark sector models\, incorporating finite-temperature effects on the prod uction and trapping for the first time\, also utilizing a more realistic mo del of the high-mixing parameter space than in previous work\, showing syst ematic uncertainties from progenitor models\, and exploring the effects of several other interesting physical considerations. These revisions have dra matic effects for the landscape of such models. LAST-MODIFIED:20170330T175327Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161031T190000Z DTEND:20161031T203000Z DTSTAMP:20260828T094430Z UID:brtree9qff2mbhh7qe44lqfr50@google.com CREATED:20161017T154035Z DESCRIPTION:Speaker: Ranjan Laha\n\nSpeaker Institution: Stanford Universit y and SLAC\n\nTitle: Two New Avenues in Dark Matter Indirect Detection\n \n Abstract: Indirect detection is one of the major ways to search for dark ma tter. In this talk\, I will introduce two new techniques. Firstly\, I wil l show how telescopes with ~ 0.1% energy resolution can exploit the Doppler shift of sharp photon features arising from dark matter interactions and s eparate the signal from background. Although the technique is general\, I will give an example of this search strategy with the 3.5 keV line. In the second half of my talk\, I will show how limits from the searches for ver y high energy photons can be used to constrain dark matter interactions. A s an example\, I will compare these limits with the dark matter interpretat ion of the "IceCube excess neutrinos." LAST-MODIFIED:20161018T132507Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - Two New Avenues in Dark Matter Indirect Detection TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170926T150000Z DTEND:20170926T161500Z DTSTAMP:20260828T094430Z UID:2nb1bhdigl0e25dam51ro09oni@google.com CREATED:20170727T194605Z DESCRIPTION:Speaker: Chong Wang (Harvard)\n\nTitle: A Web of Dualities in C ondensed Matter Physics: from Quantum Hall Effect to Exotic Quantum Critica lity\n\nAbstract: Two seemingly different quantum field theories may secret ly describe the same underlying physics — a phenomenon known as “duality". I will review some recent developments in field theory dualities in (2+1) d imensions and some of their applications in condensed matter physics\, in p articular in quantum Hall effect and quantum phase transitions.\n\nHost: Ju nhyun Lee\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n\nWhen: Tues\, Sept. 26 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Physics Bldg.)\ n LAST-MODIFIED:20170907T201644Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180307T210000Z DTEND:20180307T223000Z DTSTAMP:20260828T094430Z UID:335hcaov1qam52hq778acn9rn8@google.com CREATED:20180219T163255Z DESCRIPTION:Speaker Name: Brian Hamilton

Speaker Institution: UMD

Title: Testing Lepton Flavor Universality in Semileptonic Decays at LH Cb
 \;
Abstract: Decays of b hadrons provide a powerful probe for new physics effects that may violate the Standard Model's paradigm of Lept on Flavor Universality\, whereby the three charged lepton flavors are disti nguished only by their differing masses. A definitive observation of a devi ation from the predictions of LFU would provide unambiguous evidence of new physics. Recent measurements in the semileptonic (b to c l nu) channel hav e shown a series of tantalizing results which\, while not individually sign ificant\, are deserving of close scrutiny due to their combined significanc e and excellent consistency across different experiments and sub-channels. I will review the methods and results of LHCb measurements in this area\, a nd discuss future prospects from LHCb in Run2 and the upcoming LHCb upgrade .



 LAST-MODIFIED:20180226T184923Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170405T190000Z DTEND:20170405T200000Z DTSTAMP:20260828T094430Z UID:nvtd6dh5a6uo7ta8613kr9qnhk@google.com CREATED:20170331T182404Z DESCRIPTION:Speaker Name: Prof. Michael Hatridge\n\nSpeaker Institution : D epartment of Physics and Astronomy\, University of Pittsburgh\n\nTitle : Ci rculation and Directional Amplification in the Josephson Parametric Convert er\n\nAbstract : Nonreciprocal transport and directional amplification of w eak microwave signals are fundamental ingredients in performing efficient m easurements on quantum states of flying microwave light. This challenge has been partly met\, as quantum-limited amplification is now regularly achiev ed with parametrically-driven\, Josephson-junction based superconducting ci rcuits. However\, these devices are typically non-directional\, requiring e xternal circulators to separate incoming and outgoing signals. Recently\, t his limitation has been overcome by several proposals and experimental real izations of both directional amplifiers and circulators based on interferen ce between multiple parametric processes in a single device\, the Josephson Parametric Converter (JPC). I will discuss the growing catalogue of potent ial parametric interactions we can access in Josephson devices and how they can be mixed and matched to create multiple modes of operation in the same physical hardware.\n LAST-MODIFIED:20170331T182621Z LOCATION:LPS Seminar Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170411T171500Z DTEND:20170411T181500Z DTSTAMP:20260828T094430Z UID:je6afhrjjd8l933olbjkpfn2f0@google.com CREATED:20170404T193010Z LAST-MODIFIED:20170404T193242Z LOCATION:IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171128T160000 DTEND;TZID=America/New_York:20171128T170000 RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TU DTSTAMP:20260828T094430Z UID:19ik9djbiboiuqc2dg02lvv26r@google.com CREATED:20170809T181538Z DESCRIPTION:Joe Taylor\, Princeton University LAST-MODIFIED:20170809T181556Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170911T200000Z DTEND:20170911T210000Z DTSTAMP:20260828T094430Z UID:59r7hkgnkh4fr6364s7bplf0dl@google.com CREATED:20170906T145238Z DESCRIPTION:Title : Mechanics and dynamics of simulated membranes: extracti ng bending moduli and difficulty in the extraction of diffusion coefficient s\nSpeaker Name: Frank Brown\nSpeaker Institution : University of Californi a Santa Barbara\nNotes: http://www.marylandbiophysics.umd.edu/seminars/\nAb stract : Detailed molecular simulations are increasingly used in membrane b iophysics to assist in the interpretation of experiments. However\, many of the most fundamental physical properties prove difficult to accurately mea sure in silico due to small system sizes. The membrane bending modulus and lateral diffusion coefficient for proteins/lipids are two such properties. Two different stories will be presented related to the inference (or attemp ted inference) of these properties from simulation.\nsnejjar@umd.edu LAST-MODIFIED:20170906T145238Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180314T170000Z DTEND:20180314T183000Z DTSTAMP:20260828T094430Z UID:2n3ghdgsa2o7doe160s7s7tf1b@google.com CREATED:20171205T180832Z DESCRIPTION:Speaker: Amy Nicholson\n\nSpeaker Institution: University of No rth Carolina\n\nTitle: Quantifying New Contributions to Neutrinoless Double Beta Decay from Lattice QCD\n\nAbstract: While the discovery of non-zero n eutrino masses is among the most important accomplishments by physicists in the past century\, it is still unknown how and in what form these masses a rise. Lepton number-violating neutrinoless double beta decay is a natural c onsequence of Majorana neutrinos and many BSM theories\, and\, if observed\ , could potentially explain the matter/anti-matter asymmetry in the univers e. Several experimental searches for these processes using nuclear sources are planned and/or underway worldwide\, and understanding quantitatively ho w neutrinoless double beta decay would manifest in nuclear environments is key for interpreting any observed signals. Estimates for the necessary size and sensitivity of these experiments rely on model calculations involving only a single mechanism for the decay\, light Majorana neutrino exchange. H owever\, it is expected that new heavy\, beyond the Standard Model particle s will also contribute to this process\, and these contributions have been previously unknown even at the two nucleon level. In this talk I will give an overview of microscopic observables relevant for experimental searches f or neutrinoless double beta decay which may be calculated directly from QCD using lattice methods\, and present new results for potential short-range mechanisms. LAST-MODIFIED:20180308T170629Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160805T183000Z DTEND:20160805T193000Z DTSTAMP:20260828T094430Z UID:c2b3o908pddvj4as58vbnajq3g@google.com CREATED:20160804T130314Z DESCRIPTION:Speaker Name: Mishkat Bhattacharya\n\nSpeaker Institution: Roch ester Institute of Technology\n\nTitle: Levitated Optomechanics: Phonon coo ling\, bistability and lasing\nAbstract: In this talk I will first briefly review the field of cavity optomechanics\, i.e. the interaction of mechani cal oscillators with electromagnetic modes. Subsequently\, I will describe cavityless levitated optomechanics. Theoretical activity on the topic will be reported from our group at RIT\, in the context of ongoing experiments i n various groups including that of our collaborator A. N. Vamivakas at the University of Rochester. Applications such as cooling\, force sensing\, bis tability and phonon lasing will be considered.\n \nHost: Khan W. Mahmud LAST-MODIFIED:20160804T130426Z LOCATION:CSS 2115 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170428T161500Z DTEND:20170428T171500Z DTSTAMP:20260828T094430Z UID:meqi2m9imooincertt0dq19uo0@google.com CREATED:20170419T152308Z DESCRIPTION:Title: Complexity of sampling as an order parameter\n\nSpeaker Name: Abhinav Deshpande\n\nSpeaker Institution: QuICS and JQI\n\nAbstract: We consider the classical complexity of approximately simulating time evolu tion under spatially local quadratic bosonic Hamiltonians for time t. We ob tain upper bounds on the scaling of t with the number of bosons\, n\, for w hich simulation is classically efficient. We also obtain a lower bound on t he scaling of t with n for which this problem reduces to a general instance of the boson sampling problem and is hence hard\, assuming the conjectures of Aaronson and Arkhipov [Proc. 43rd Annu. ACM Symp. Theory Comput. STOC ' 11]. We view these results in the light of classifying phases of physical s ystems based on parameters in the Hamiltonian and conjecture a link to dyna mical phase transitions. In doing so\, we combine ideas from mathematical p hysics and computational complexity to gain insight into the behavior of co ndensed matter systems.\n\nPreprint: arXiv:1703.05332 LAST-MODIFIED:20170421T164122Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180328T150000Z DTEND:20180328T160000Z DTSTAMP:20260828T094430Z UID:0dfa2itfi0qpj7nnha9r5j3cmq@google.com CREATED:20180322T145656Z DESCRIPTION:
Speaker: Professor John P. Perdew\, Departments of P hysics and Chemistry\, Temple University

Title: Band Gaps fro m Hybrid Density Functionals for 1D\, 2D\, and 3D Solids: The Right Answer for the Right Reason

Abstract: \;Realistic band gap s ofsemiconductors extended in 1D\, 2D\, or 3D are found within density fun ctionalcalculations only from hybrid functionals that mix in a fraction of exactexchange\, and then only in a generalized Kohn-Sham (GKS) scheme that employs anon-multiplicative exchange-correlation potential.The present work moves the justification forthis standard approach from empiri cism to first principles. The experimentalgap is a ground-state energy seco nd difference (ionization energy minuselectron affinity). Under rather gene ral conditions\, it is proved analyticallyand numerically [1] that the GKS gap in the band structure for a givenapproximate functional is equal to the ground-state energy second differencefor the same approximate functional\, and thus has a physical interpretation inground-state density functional t heory\, improving up the ladder from the localdensity approximation to the generalized gradient approximation (GGA)\, themeta-GGA\, and the hybrid. Al though the SCAN meta-GGA often performs as well asa hybrid\, this is not so for the band gap\, because only the hybrid includes thelong-range partly-s creened exchange present in semiconductors.

[1] J.P. Perdew\ , W. Yang\,K. Burke\, E.K.U. Gross\, M. Scheffler\, G.E. Scuseria\, Z. Yang \, A. Ruzsinszky\, H.Peng\, J. Sun\, I.Y. Zhang\, T.M. Henderson\, E. Trush in\, and A. Goerling\,Proceedings of the National Academy of Sciences (USA) 114\, 2801 (2017).

LAST-MODIFIED:20180322T145656Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180628T170000Z DTEND:20180628T183000Z DTSTAMP:20260828T094430Z UID:5dms8hsvvc24k37b9he7pjfi3r@google.com CREATED:20180529T133101Z DESCRIPTION:
Speaker: Bhupal Dev

Speaker Institution: Washington University

Title: New Physics at IceCube

Abstract: The recent observation of high-energy neutrinos at the IceCube neutrino telescope has opened a new era in neutrino astrophysics. Understanding all aspects of th e IceCube events is very important for both astrophysics and particle physi cs ramifications. In this talk\, we will show that a single-component astro physical neutrino flux cannot explain all the events. This leads to the int riguing possibility of some new physics effect and we will discuss a few ex amples\, such as decaying dark matter\, leptoquarks and supersymmetry.
LAST-MODIFIED:20180619T180920Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar *New Time* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161012T150000Z DTEND:20161012T160000Z DTSTAMP:20260828T094430Z UID:04okafqjhc76ep9v7lf093b8i8@google.com CREATED:20160907T161211Z DESCRIPTION:Speaker Name: Shivaji Sondhi \n\nSpeaker Institution: Princeto n\n\nTitle: The Statistical Mechanics of Driven Quantum Systems\n\nAbstract : The statistical mechanics of equilibrium systems is characterized by two fundamental ideas: that closed systems approach a late time thermal state a nd that of phase structure wherein such late time states exhibit singular c hanges as various parameters characterizing the system are changed. Recent progress has established generalizations of these ideas which apply to peri odically driven\, or Floquet\, closed quantum systems. I will summarize thi s progress and show that it has resulted in the discovery of entirely new p hases such as the Pi-spin glass/Floquet time crystal which exist only out o f equilibrium.\n\nHost: Xiao Li\n\nhttp://www.physics.umd.edu/cmtc/seminars .html LAST-MODIFIED:20161007T190154Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170503T190000Z DTEND:20170503T200000Z DTSTAMP:20260828T094430Z UID:brucn9ehdtsf65tgqggnsoidn4@google.com CREATED:20170427T133155Z DESCRIPTION:Speaker Name: Prof. Jack Harris\n\nSpeaker Institution: Yale Un iversity\n\nTitle: Topological physics with a pair of oscillators beyond t he Berry phase via exceptional points\n\nAbstract : Topological phenomena a ppear in a number of physical systems\, from exotic quantum phases to caref ully engineered waveguides. They offer new types of control\, and are also intriguing in their own right. I will describe a topological feature that i s generically present in one of nature's simplest systems: a pair of couple d oscillators. I will describe experiments in which we demonstrate this fea ture and use it to achieve topological control over the excitations in a sy stem. These effects are classical\, but our experiments use an optomechanic al device that exhibits detectable quantum fluctuations. I will describe so me prospects for studying the interplay of topological and quantum effects in such a system.\n LAST-MODIFIED:20170427T133339Z LOCATION:LPS Seminar Room SEQUENCE:3 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161103T163000Z DTEND:20161103T173000Z DTSTAMP:20260828T094430Z UID:o8mmksiim4fjb01b33ldluibqg@google.com CREATED:20160825T182915Z DESCRIPTION:Speaker Name: Dan Gauthier\n\nSpeaker Institution : Ohio State University\n\nTitle: Reservoir Computing Using Autonomour Boolean Networks LAST-MODIFIED:20160825T183122Z LOCATION:ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - Reservoir Computing Using Autonomour Boo lean Networks TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171018T183000Z DTEND:20171018T200000Z DTSTAMP:20260828T094430Z UID:4b3vmu6inrlru11rqd8iclrr3g@google.com CREATED:20170913T133039Z DESCRIPTION:Speaker: Dan Carney\n\nSpeaker Institution: University of Maryl and\n\nTitle: Infrared Quantum Information\n\nAbstract: Recently there has been a resurgence of interest in long-wavelength photons and gravitons. I'l l discuss information theoretic aspects of these particles. In particular I will show that photo/gravitoemission during scattering processes leads to highly decohered outgoing scattering states of charged/massive objects. Fol lowing Strominger\, this may be relevant to the black hole information loss problem. LAST-MODIFIED:20171009T172243Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170222T160000Z DTEND:20170222T170000Z DTSTAMP:20260828T094430Z UID:0mkg82ck8v2mdqogglp59rrvj0@google.com CREATED:20170213T145052Z DESCRIPTION:Speaker: Pravesh Kothari\n\nSpeaker Affiliation: Princeton Univ ersity\n\nTitle: Quantum Entanglement\, Sum-of-Squares and the Log-Rank Con jecture\n\nAbstract: This talk will be about a sub-exponential time algorit hm for the Best Separable State (BSS) problem. \nFor every constant \\eps>0 \, we give an exp(\\sqrt(n) \\poly log(n))-time algorithm for the 1 vs 1-\\ eps BSS problem of distinguishing\, given an n^2 x n^2 matrix M correspondi ng to a quantum measurement\, between the case that there is a separable (i .e.\, non-entangled) state \\rho that M accepts with probability 1\, and th e case that every separable state is accepted with probability at most 1-\ \eps.\n\nEquivalently\, our algorithm takes the description of a subspace W \\subset F^{n^2} (where F can be either the real or complex field) and dis tinguishes between the case that W contains a rank one matrix\, and the cas e that every rank one matrix is at least \\eps far (in Euclidean distance) from W. \n\nThe algorithm is based on the sum-of-squares semidefinite prog ramming hierarchy - a powerful hierarchy of semidefinite programming relaxa tions that has recently been used to design fast approximation algorithms f or problems in combinatorial optimization\, machine learning and quantum in formation. \n\nIn this talk\, I'll use the BSS problem as an example to ill ustrate a general rounding paradigm for the sum-of-squares algorithm. Somew hat surprisingly\, a key technical step in the instantiation of this paradi gm to analyze a rounding scheme for the BSS problem will be inspired by the recent breakthrough on the log-rank conjecture of Lovett (STOC'14\, JACM'1 6) who showed that the communication complexity of every rank-n Boolean mat rix is bounded by \\sqrt{n} poly log(n). \n\nThe talk will assume no specia lized background. \n\nBased on joint work with Boaz Barak (Harvard) and Dav id Steurer (Cornell\, IAS). LAST-MODIFIED:20170213T145052Z LOCATION:3100A Atlantic Building (Computer and Space Science) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170413T163000Z DTEND:20170413T173000Z DTSTAMP:20260828T094430Z UID:i5ok0l7ghc0i8j38g4vl64ed6c@google.com CREATED:20170127T153451Z DESCRIPTION:Speaker Name: Edward Ott\n\nSpeaker Institution: University o f Maryland - Department of Electrical Engineering and Department of Physics \n\nTitle: Chaotic Dynamics in the Physical Sciences\n\nEd Ott will be the recipient of the 2017 Lewis Fry Richardson Medal from The European Geoscien ces Union (E.G.U.). In connection with this award\, he will give a lecture at the annual E.G.U. Assembly in Vienna\, Austria\, later this month. This Applied Dynamics Seminar will be a preview of his talk in Vienna.\nAbstract : Chaos was discovered at the end of the 19th century by Poincare in his fa mous work on the motion of N>2 celestial bodies interacting through gravita tional attraction. Although steady progress was made by mathematicians foll owing Poincare's work\, the widespread impact and development of chaos in t he physical sciences is comparatively recent\, i.e.\, approximately startin g in the 1970's. This talk will review and comment on this history and will give some examples illustrating the types of questions\, problems and resu lts arising from perspectives resulting from the widespread participation o f physical scientists in chaos research. LAST-MODIFIED:20170330T141003Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180911T170000Z DTEND:20180911T183000Z DTSTAMP:20260828T094430Z UID:1c5g2r1ap246mlp7esp5gov2a3@google.com CREATED:20180827T153443Z DESCRIPTION:Title: Improving students' understanding of quantum mechanics\n \nSpeaker: Chandralekha Singh\, Department of Physics and Astronomy\, Unive rsity of Pittsburgh\n\nAbstract: Learning quantum mechanics is challenging. o help improve student understanding of quantum concepts\, we have been co nducting investigations of the difficulties that students have in learning quantum mechanics and are developing quantum interactive learning tutorials (QuILTs) as well as tools for peer-instruction. The goal of QuILTs and pee r-instruction tools is to actively engage students in the learning process and to help them build links between the formalism and the conceptual aspec ts of quantum physics without compromising the technical content. They focu s on helping students integrate qualitative and quantitative understanding without compromising technical content. In this talk\, I will discuss a fra mework to understand students' difficulties with quantum mechanics and give examples of how learning tools can be designed to help students develop a robust knowledge structure.\n\nWhen: 1-230pm\n\nWhere: 2126 Toll\nContact E rin Sohr: esohr@terpmail.umd.edu LAST-MODIFIED:20180911T153106Z LOCATION:2126 Toll Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:PERG seminar: Improving students' understanding of quantum mechanic s TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180328T150000Z DTEND:20180328T160000Z DTSTAMP:20260828T094430Z UID:5ngsoeeefj1honfpevgnaa19ah@google.com CREATED:20180208T165721Z DESCRIPTION:Speaker Name: Alicia Kollar\n\nSpeaker Institution: Princeton \n\nTitle:\n\nAbstract: LAST-MODIFIED:20180328T143828Z LOCATION:PSC 2136 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Special AMO seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161208T173000Z DTEND:20161208T183000Z DTSTAMP:20260828T094430Z UID:d48d53kfbs40gfauln245mdle4@google.com CREATED:20160826T152250Z DESCRIPTION:Speaker Name: Dmitry Doglopyat\n\nSpeaker Institution: Univer sity of Maryland\n\nTitle: Fermi Acceleration in Discontinuous Systems LAST-MODIFIED:20161005T132505Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180219T210000Z DTEND:20180219T223000Z DTSTAMP:20260828T094430Z UID:0929kg851klv58lm3pdgmgbov5@google.com CREATED:20180212T142404Z DESCRIPTION:\nSpeaker: Ben Nachman\n\nSpeaker Institution: Lawrence Berkele y National Lab\n\nTitle: Machine Learning for Jet Physics at the Large Hadr on Collider \n\nAbstract: Modern machine learning (ML) has introduced a ne w and powerful toolkit to High Energy Physics. While only a small number o f these techniques are currently used in practice\, research and developmen t centered around modern ML has exploded over the last year(s). I will hig hlight recent advances with a focus on jets: collimated sprays of particles resulting from quarks and gluons produced at high energy. Themselves defi ned by unsupervised learning algorithms\, jets are a prime benchmark for st ate-of-the-art ML applications and innovations. For example\, I will show how deep learning has been applied to jets for classification\, regression\ , and generation. These tools hold immense potential\, but incorporating d omain-specific knowledge is necessary for optimal performance. In addition \, studying what the machines are learning is critical for robustness and m ay even help us learn new physics! LAST-MODIFIED:20180212T142410Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170220T180000Z DTEND:20170220T190000Z DTSTAMP:20260828T094430Z UID:0sr3las3llqqcpnuo7l3liv1ss@google.com CREATED:20170209T150349Z DESCRIPTION:Speaker Name: Soeren Schlichting\n\nSpeaker Institution: Brookh aven National Lab\n\nTitle: “Non-equilibrium dynamics of high-energy heavy- ion collisions”\n\nAbstract: Over the past decades heavy-ion experiments at RHIC and the LHC have revealed exciting properties of nuclear matter under extreme conditions\, including the existence of a new state of matter\, th e Quark-Gluon Plasma (QGP). Strikingly\, the QGP behaves as a nearly perfec t fluid and effective descriptions in terms of relativistic viscous hydrody namics have been a tremendous phenomenological success. However\, understan ding the dynamical origin of the observed hydrodynamic behavior represents a long standing theoretical challenge\, concerning in particular the questi on how an equilibrated QGP liquid is created in the early stages of high-en ergy nuclear collisions. Following a short introduction to the physics of h igh-energy heavy-ion collisions\, I will discuss recent theoretical progres s in understanding the early time non-equilibrium dynamics from the point o f collision to the formation of a hydrodynamic liquid. Specifically\, I wil l describe how a consistent description of this pre-equilibrium stage can b e achieved by a combination of weak-coupling methods and present first appl ications of this framework to collective flow and anomalous transport pheno mena.\n LAST-MODIFIED:20170215T213217Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160428T123000 DTEND;TZID=America/New_York:20160428T133000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8_R20160421T163000@google.com RECURRENCE-ID;TZID=America/New_York:20160428T123000 CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Henry Abarbanel \n\nSpeaker Institution: UC San Diego\n\nTitle: Nonlinear Dynamics\n \nAbstract: This is about how to do 4DVar\, as the meteorologists call it--with some confidence one has found t he lowest minimum for the cost function--and\, methods for evaluating the c orrections to this approximation. Many more subtle details which I would be pleased to get your views about as well. LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160922T193000Z DTEND:20160922T203000Z DTSTAMP:20260828T094430Z UID:5834le4gpiur4stalrgtpqphus@google.com CREATED:20160916T143227Z DESCRIPTION:Speaker: Jonathan Rosenberg (UMd) LAST-MODIFIED:20160916T143227Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mukai duality and the SYZ conjecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180914T160000Z DTEND:20180914T164500Z DTSTAMP:20260828T094430Z UID:n0sjmtn6gudoekgq2mh5ir5mt0@google.com CREATED:20180906T193210Z DESCRIPTION:Title: Single-photon bound states in atomic ensembles\n\nSpeake r: Yidan Wang\, JQI\n\nAbstract: We illustrate the existence of single-exci tation bound states for propagating photons interacting with N two-level at oms. These bound states can be calculated from an effective spin model\, an d their existence relies on dissipation in the system. The appearance of th ese bound states is in a one-to-one correspondence with zeros in the single -photon transmission and with divergent bunching in the second-order photon -photon correlation function. We also formulate a dissipative version of Le vinson's theorem for this system by looking at the relation between the num ber of bound states and the winding number of the transmission phases. This theorem allows a direct experimental measurement of the number of bound st ates using the measured transmission phases. \n\nNotes: Lunch served at 12: 00 pm\, talk at 12:15 pm. LAST-MODIFIED:20180907T204043Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160930T180000Z DTEND:20160930T193000Z DTSTAMP:20260828T094430Z UID:jcbkitmah82m577veq0f53jggs@google.com CREATED:20160926T145052Z DESCRIPTION:Speaker: Zohreh Davoudi\n\nSpeaker Institution: MIT\n\nTitle: N eutrinoless double beta decay: The role of effective field theory and latti ce QCD\n\nAbstract: Neutrinoless double beta decay\, being a lepton-number violating process\, has been the focus of numerous experimental and theoret ical investigations in recent years\, and the hope is the the planned US to n-scale experiment will push the current limits towards a discovery. If obs erved\, it unambiguously proves that neutrinos are Majorana particles. None theless\, the underlying new physics responsible for this process can only be constrained if the theoretical predictions of the rate could be refined. This talk demonstrates the roadmap in connecting the underlying theory to the corresponding nuclear matrix elements\, focusing mainly on the nonpertu rbative nucleonic matrix elements in the simplest extension of Standard Mod el in which the light left-handed neutrino is mediating the process. The ro le of lattice QCD and effective field theory in this program will be discus sed. Finally\, we discuss the prospect of a direct matching of the nn to pp amplitude to effective field theory within the light-neutrino exchange sce nario. LAST-MODIFIED:20160926T184425Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180712T140000Z DTEND:20180712T150000Z DTSTAMP:20260828T094430Z UID:7i0foork37j30hnkcmc2b4h365@google.com CREATED:20180709T141513Z DESCRIPTION:\nSpeaker: Daniele Alves\n\nSpeaker Institution: Los Alamos Nat ional Lab\n\nTitle: A viable QCD axion in the MeV mass range\n\nAbstract: T he QCD axion is one of the most compelling solutions of the strong CP probl em. There are major current efforts into searching for an ultralight\, invi sible axion\, which is believed to be the only phenomenologically viable re alization of the QCD axion. Visible axions with decay constants at or below the electroweak scale are believed to have been long excluded by laborator y searches. Considering the significance of the axion solution of the stron g CP problem\, in this talk I will revisit experimental constraints on QCD axions in the O(10 MeV) mass window\, and point out a variant axion model t hat still remains compatible with existing constraints. This model predicts new states at the GeV scale coupled hadronically\, and a variety of low-en ergy axion signatures\, such as rare meson decays\, nuclear de-excitations via axion emission\, production in e+e− annihilation and fixed target exper iments. This reopens the possibility of solving the strong CP problem at th e GeV scale. LAST-MODIFIED:20180710T192639Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar **New Time** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161007T180000Z DTEND:20161007T190000Z DTSTAMP:20260828T094430Z UID:k4vl7bk2dve9ia9a7ccojc5nr4@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.k4vl7bk2dve9ia9 a7ccojc5nr4 CREATED:20160930T201616Z DESCRIPTION:Speaker: Rajdeep Sensarma (Tata Institute of Fundamental Resear ch\,India) \n\nTitle: Potential Inhomogeneities in Presence of Strong Inter actions: Birth and Death of Superconductors\n\nAbstract: Strong repulsive i nteractions and potential inhomogeneities both tend to localize Fermions on a lattice and lead to loss of superconductivity. The natural question that comes up is whether they compete or complement each other when both are pr esent in a system at the same time. In this talk\, we will use a effective Hamiltonian approach which treats both interactions and inhomogeneities on the same footing to look at two systems: (a) the Ionic Hubbard Model at hal f-filling\, where a staggered potential on a bipartite lattice competes wit h interactions to delocalize charge and give birth to a novel superconducto r. The superconducting Tc scales with the bandwidth of the system and shows a non-monotonic behaviour with the staggered potential\, (b) the disorder ed Hubbard model away from half-filling\, where weak disorder competes with strong interaction to preserve superconductivity\, but strong disorder com plements interactions leading to sudden death of superconductivity in this system.\n\nTime: Fri. Oct 7 at 2PM\nLocation: 2205 John S. Toll Physics Bui lding\n\nHost: Dong-Ling Deng\n\nJoin with Google Hangouts: https://plus.go ogle.com/hangouts/_/calendar/bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2 FsZW5kYXIuZ29vZ2xlLmNvbQ.k4vl7bk2dve9ia9a7ccojc5nr4?hs=121 LAST-MODIFIED:20160930T201616Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171121T160000Z DTEND:20171121T171500Z DTSTAMP:20260828T094430Z UID:6g6mvqs0f9g40kvp6296cft2j0@google.com CREATED:20171006T190717Z DESCRIPTION:Speaker: Shubhayu Chatterjee (Harvard)\n\nTitle: Intertwining t opological order and discrete broken symmetries in the hole-doped cuprates via quantum fluctuating antiferromagnetism\n\nAbstract: The enigmatic pseud ogap metal phase of the hole-doped cuprate superconductors has two seemingl y unrelated characteristics : (i) a gap in the electronic spectrum along th e axes of the square lattice Brillouin zone\, and (ii) the presence of disc rete broken symmetries (like rotation\, inversion or time-reversal). In a n ormal metal with full translational symmetry\, a gap in the electron spectr um in the anti-nodal region cannot be explained by such broken symmetries. We propose a resolution to this puzzle by intertwining topological order wi th broken symmetries in the pseudogap metal. We show that the required flav ors of topological order\, corresponding to precisely the broken symmetries observed in the cuprates\, arise naturally in a SU(2) gauge theory of quan tum fluctuations of magnetically ordered phases that lie proximate to the N éel phase. We explore how alternative descriptions of fluctuating Néel anti ferromagnets\, in terms of the semiclassical O(3) non-linear σ model\, and the CP1 model\, also naturally lead to the same phases. If time permits\, w e will also discuss comparisons between the gauge theory and recent numeric al (DMFT and QMC) results on the two-dimensional Hubbard model.\n\nReferenc es: arXiv: 1703.00014\, arXiv: 1705.06289\n\nHost: Jay Sau\n\nhttp://www.ph ysics.umd.edu/cmtc/seminars.html\n\nWhen: Tues\, Nov. 21 @ 11:00am\nWhere: CMTC Conference Room (2205 Toll Physics Bldg.)\n LAST-MODIFIED:20171006T191812Z LOCATION:2205 John S. Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180312T200000Z DTEND:20180312T210000Z DTSTAMP:20260828T094430Z UID:1o3q4s8lfu8c5fld9pnhobl98l@google.com CREATED:20180215T201830Z DESCRIPTION:Speaker Name: Juan Del Alamo\n\nSpeaker Institution : Universit y of California at San Diego\n\nTitle : The mechanics of leukocyte extravas ation and subsequent migration through the three-dimensional extracellular matrix\n\nNotes: http://www.marylandbiophysics.umd.edu/seminars/\n\nAbstrac t : Leukocyte transmigration across vessel walls is a critical step in the immune response. Upon their activation and firm adhesion to vascular endoth elial cells (VECs)\, leukocytes cross junctional gaps in the endothelial mo nolayer (paracellular diapedesis). It has been hypothesized that VECs facil itate diapedesis by opening their cell-cell junctions in response to an adh ering leukocyte. However\, it is unclear how leukocytes interact mechanical ly with VECs to open the VEC junctions and migrate across the endothelium. We measured the 3D traction stresses generated by the leukocytes and VECs t o elucidate the sequence of mechanical events involved in paracellular diap edesis. Decoupling the stresses exerted by the leukocytes and the VECs reve als that the leukocytes actively contract the VECs to open a junctional gap \, and then push themselves across the gap by generating strong stresses th at push into the matrix. In addition\, we found that diapedesis is facilita ted when the tension fluctuations in the VEC monolayer were increased by pr o-inflammatory agents. Our findings demonstrate that diapedesis can be mech anically regulated by the transmigrating leukocytes and by pro-inflammatory signals that increase VEC contractility. \n\nUpon extravasation\, leukocyt es migrate through fibrous 3-D matrices. To study the mechanics of this pro cess\, we are investigating 3-D leukocyte motility in collagen matrices of different concentrations using custom built microfluidic devices. Particle Image Velocimetry and Finite Deformation Theory are used to compute displac ement fields in the collagen matrices. Stress fields in the matrices were c omputed using our E3DFM method. We will present data showing that morpholog ical changes and migratory patterns vary depending on the porosity of the c ollagen matrices. We will also provide data showing a clear relationship be tween the aforementioned migratory characteristics and computed displacemen t and stress fields around migrating leukocytes. The results from our study show that neutrophils migrating in 3-D environments employ distinct mechan ical mechanisms that depend on the structure of their mechanical environmen ts. LAST-MODIFIED:20180215T202036Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180228T210000Z DTEND:20180228T223000Z DTSTAMP:20260828T094430Z UID:4nulj8aehunjhkmn5t03c1rdb7@google.com CREATED:20180214T141722Z DESCRIPTION:Speaker Name: Manuel Franco Sevilla\n\nSpeaker Institution: U niversity of California\, Santa Barbara\n\n\nTitle: Searching for physics beyond the Standard Model in the LHC era\n\nAbstract: At the end of the XI X century\, Lord Kelvin summarized a widespread feeling among physicists by saying that "physics is essentially complete\, save for two little clouds" . The "clouds" he was (apocryphally) referring to were the puzzling results from two measurements\, the Michelson-Morley experiment and the Black-body spectrum\, whose explanations ushered in an unprecedented era of discoveri es that stretched throughout most of the XX century. After the culmination of the Standard Model in the 70's\, the field of particle physics has found itself in a similar situation. Today\, the "clouds" guiding the searches f or physics beyond the Standard Model are issues like dark matter or the hie rarchy problem. Using SUSY searches at CMS and the measurement of B->D(*)Ta uNu decays at BaBar as models\, I will give an overview of some of the main strategies that are being followed in the quest to find new physics in the XXI century. LAST-MODIFIED:20180221T165607Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160913T170000Z DTEND:20160913T183000Z DTSTAMP:20260828T094430Z UID:i641glmejnia2aboa35u54ght8@google.com CREATED:20160831T205457Z DESCRIPTION:Speaker: Soeren Schlichting\n\nSpeaker Institution: Brookhaven National Laboratory\n\nTitle: “Exploring the early stages of high-energy he avy-ion collisions”\n\nAbstract: Over the past decades heavy-ion experiment s at RHIC and the LHC have revealed exciting properties of nuclear matter u nder extreme conditions\, including the existence of a new state of matter\ , the Quark-Gluon Plasma (QGP). Strikingly\, the QGP behaves as a nearly pe rfect fluid and shares important features with strongly correlated many-bod y systems across different energy scales. While different experiments succe ssfully confirmed these observations\, their theoretical description has re mained a challenge and fundamental questions such as ”How is the Quark-Gluo n plasma created during the early stages of high-energy collisions?” have c ome more and more into focus.\n\nBased on a general introduction to the phy sics of high-energy heavy-ion collisions\, I will discuss recent theoretica l progress in understanding the early time non-equilibrium dynamics of thes e systems. Specifically\, I will discuss how an ab-initio description of th e pre-equilibrium stage can be achieved by a combination of weak-coupling m ethods and present first applications of this framework to study anomaly in duced transport phenomena such as the Chiral magnetic effect. LAST-MODIFIED:20160901T142145Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170412T203000Z DTEND:20170412T213000Z DTSTAMP:20260828T094430Z UID:fkhe1c292cu83tht9qdvk5smkg@google.com CREATED:20170407T134631Z DESCRIPTION:Speaker Name: Eun-Suk Seo\n\nSpeaker Institution : University o f Maryland\n\nTitle : "High-flying Experiments to Investigate Mysteries of Cosmic Rays"\n\nAbstract : One of the most exciting possibilities in cosmic ray research is the potential to discover new phenomena. Elementary partic les were discovered in cosmic rays before modern-day accelerators became av ailable to study their detailed properties. Since the discovery of cosmic r ay antiprotons in 1979 using a balloon-borne magnet spectrometer\, a series of magnet spectrometers have been flown to search for the signature of dar k matter annihilation in antiprotons and positrons. Being the same as parti cles except for their opposite charge sign\, antiparticles are readily dist inguished as they bend in opposite directions in the magnetic field. As lon g-duration balloon flights over Antarctica became available\, not only anti proton to proton ratios\, but also measurements of antiproton energy spectr a became possible. Furthermore\, PAMELA on a Russian Satellite and AMS-02 o n the International Space Station (ISS) are currently providing precision m easurements of various particles and anti-particles\, including positions a nd antiprotons. In particular\, excess positrons generated a lot of excitem ent due to their possible explanation of dark matter. More recently\, the J AXA-led CALET ISS mission and the DAMPE Chinese Satellite were launched. NA SA’s ISS-CREAM was delivered to KSC to await launch by SpaceX after complet ing its final verification at GSFC. These missions will provide complementa ry measurements exploring energies higher than previously possible to const rain cosmic ray propagation models in search of dark matter and the origin of cosmic rays. Recent results\, their implications\, and the outlook for t he field will be presented. LAST-MODIFIED:20170407T134734Z LOCATION: PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170504T163000Z DTEND:20170504T173000Z DTSTAMP:20260828T094430Z UID:3v7p35p42j4hbia6tbdsqpdkdg@google.com CREATED:20170504T124806Z DESCRIPTION:PHYS 798E and ENEE 698D\n\nTitle: Space Measurement of A Rocket -Released Turbulence (SMART)\nSpeaker: Dr. Guru Ganguli\nAffiliation: Plasm a Physics Division\, Naval Research Laboratory\, Washington DC\n\nAbstract: The Electromagnetic environment of the near-earth space is of academic as well as practical interest. Plasma turbulence in the whistler branch waves with frequencies between the ion and electron gyro-frequencies play a majo r role in defining the natural plasma setting of this region. The general properties of the whistler branch waves in the ionosphere and magnetosphere will be discussed. The possibility of an active experiment to seed and mo nitor the nonlinear evolution of whistler mode turbulence in the near-earth space will be considered.\n\n Bio: Dr. Gurudas Ganguli is the Senior Scien tist for Intense Particle Beams and Plasma Processes at the Plasma Physics Division\, Naval Research Laboratory\, Washington DC. He received his B.Sc . in physics from St. Xavier's College\, Ahmedabad\, India in 1974 and Ph.D . in Physics from Boston College\, Boston\, MA in 1980. His research inter ests concern the study of turbulent and coherent processes in collisional a nd collisionless plasmas\, dusty plasmas\, and their applications to both s pace and laboratory. He has contributed to the physics of ionospheric and m agnetospheric plasmas including the dynamics in the earth’s natural and art ificial radiation belts. He is a Fellow of the American Physical Society an d member of the American Physical Society\, American Geophysical Union\, an d International Union of Radio Science. \n\n\n\n LAST-MODIFIED:20170508T130537Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170227T210000Z DTEND:20170227T220000Z DTSTAMP:20260828T094430Z UID:mpnjijs3rr9oibbl9eqfu5s64c@google.com CREATED:20170105T222715Z DESCRIPTION:Technical Seminar\n\nSPEAKER: Stuart Parkin\nMax Planck Institu te for Microstructure Physics\, Halle (Saale)\, Germany\nMartin Luther Univ ersity Halle-Wittenberg\n\nTITLE: Spin orbitronics for advanced magnetic m emories\n\nABSTRACT: Over the past few years there have been remarkable di scoveries in spin-based phenomena that rely on spin-orbit coupling that cou ld spur the development of advanced magnetic memory devices. These include the formation of chiral spin textures in the form of Néel domain walls and topological spin textures\, skyrmions\, that are stabilized by a Dzyaloshi nskii-Moriya exchange interaction. The Dzyaloshinskii-Moriya exchange inte raction is derived from broken symmetries and spin-orbit interactions at in terfaces or within the bulk of materials. Another important consequence of spin-orbit effects are the unexpectedly high conversion efficiencies of ch arge current to chiral spin current from topological spin textures and in c onventional metals\, via the spin Hall effect. Such spin currents lead to giant spin-orbit torques that can be used to switch the magnetization in th ree terminal magnetic tunnel junction memory elements or can be used to mov e domain walls in Racetrack Memory memory-storage devices. Indeed \nrecor d-breaking current-induced domain wall speeds exceeding 1\,000 m/sec have r ecently been reported in atomically engineered synthetic antiferromagnetic racetracks in which the domain walls are “invisible” with no net magnetizat ion. I will discuss some of these exciting developments in the emerging fi eld of spin orbitronics in my talk.\n\nHOST: Chris Lobb\n LAST-MODIFIED:20170213T194233Z LOCATION:John S Toll Physics Bldg.\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Stuart Parkin lecture (1st of two talks by Carr lecturer) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180131T180000Z DTEND:20180131T193000Z DTSTAMP:20260828T094430Z UID:3arcgopgj9mglockpfanklemnf@google.com CREATED:20180118T194710Z DESCRIPTION:\n*New Start Time: 1:00pm*\nSpeaker: Neill Warrington\n\nSpeake r institution: University of Maryland\n\nTitle: Neutrino-nucleon Scattering in the Neutrinosphere \n\nAbstract: We present the calculation of the dif ferential scattering rate of thermal neutrinos in a hot and dilute gas of i nteracting neutrons expected in the neutrino decoupling regions of supernov ae. The dynamical structure factors for density and spin fluctuations of th e strongly interacting neutron matter\, the basic ingredients for computing the scattering rate\, are calculated in the virial expansion for the first time. We find that attractive s-wave interactions enhance the density resp onse and suppress the spin response of neutron matter. The net effect of ne utron correlations is to strongly suppress neutrino backscattering. Moreove r we find nearly exact scaling laws for the response functions allowing for analytic expressions for the dynamic structure factors at second-order in the fugacity. We find that that dynamical correlations are essential to des cribe neutrino decoupling in supernovae and neutron star mergers. LAST-MODIFIED:20180129T191205Z SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180129T210000Z DTEND:20180129T223000Z DTSTAMP:20260828T094430Z UID:23u23h2u8d3g10crjd73736l3e@google.com CREATED:20180125T141547Z DESCRIPTION:\nSpeaker: Kaustubh Deshpande\n\nSpeaker institution: Universit y of Maryland\n\nTitle: New physics opportunities for long-lived particles at electron-proton colliders \n\nAbstract: Future electron-proton (ep) col lider proposals like the LHeC or the FCC-eh can supply 1/ab of collisions w ith a center-of-mass energy in the TeV range\, while maintaining a clean ex perimental environment more commonly associated with lepton colliders. This makes them ideally suited to probe BSM signatures with final states that l ook like "hadronic noise" in the high-energy\, pile-up-rich environment of hadron colliders. Focusing on the generic vector boson fusion production me chanism\, which is available for all BSM particles with electroweak charges \, ep colliders can probe mass scales far above the reach of most lepton co lliders. This unique experimental environment can be exploited in the searc h for long-lived particles (LLPs)\, which are theoretically very highly mot ivated and can feature in a broad class of BSM theories. In this talk\, sig nals arising from long-lived Higgsinos and exotic Higgs decays will be pres ented as case studies. At ep colliders\, LLPs with soft decay products and very short lifetimes can be probed\, thus exploring significant regions of BSM parameter space inaccessible to other collider searches. This also prov ides important implications for the design of such machines. LAST-MODIFIED:20180125T142712Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180205T210000Z DTEND:20180205T220000Z DTSTAMP:20260828T094430Z UID:4l9eidrhhgkhag1mq66ljotl28@google.com CREATED:20180201T210945Z DESCRIPTION:\n\nSPEAKER: Robert Schoelkopf\, Yale University\n\nTITLE: Sc hrodinger’s Catapult: Quantum Communication with Microwave Photons\n\nABSTR ACT: An important ability for quantum communication networks or for scalab le quantum computers is the ability to robustly convey quantum information between separable elements\, and generate entanglement on demand. We have r ecently demonstrated the ability to generate and launch single microwave ph otons through a coaxial cable. Moreover\, this can be extended to more comp lex non-classical states with multiple photons\, including small cat states \, hence the term “Schrodinger’s catapult.” I will show experiments in whic h we can\nconvert from standing states in a cavity to flying photons in a t ransmission line\, and the ability to make and measure entanglement between standing and flying states. Furthermore\, we can use these techniques to t ransfer an encoded bit of quantum information between two modules that are separated by a meter of coaxial cable. Finally\, one can perform a “half-tr ansfer to generate remote entanglement on demand. I will also discuss the p rospects for applying quantum error correction techniques to compensate for the small but inevitable losses during the transmission process. LAST-MODIFIED:20180201T210945Z LOCATION:Room 1201 Toll Bldg.\; Refreshments at 3:30 in room 1117 Toll Bldg . SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar: Dr. Rob Schoelkopf\, Yale TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180910T113000 DTEND;TZID=America/New_York:20180910T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44@google.com RECURRENCE-ID;TZID=America/New_York:20180910T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Understanding quantum statistical mechanics in an isolat ed system and how machine learning can help\n\nSpeaker: Xiao Li\, JQI\n\nAb stract: Since the seminal work by P. W. Anderson in 1958 [1]\, quantum loca lization in a disordered system has been a central subject of condensed mat ter physics. In the past decade\, this subject has again become an area of intense research activities as people realized that even in the presence of interactions\, a many-body system can generally fail to thermalize on its own when strong disorder is present\, leading to a stable dynamical phase o f matter at non-zero temperatures [2]. Such a perfect interacting insulator has since been termed as many-body localized (MBL). More importantly\, an MBL system strongly violates the familiar ergodicity hypothesis in quantum statistical mechanics\, so that many of our intuitions from equilibrium sys tems no longer apply. In this talk\, I will focus on a one-dimensional mutu ally incommensurate bichromatic lattice system which has been implemented i n ultracold atoms to study quantum localization. We argue that without inte ractions\, there exists a single-particle mobility edge (SPME) in the energ y spectrum [3]\, which is an energy that separates extended eigenstates fro m localized ones. Our theoretical work has led to the first experimental ob servation of SPME in one-dimensional systems [4]. We further study the prop erties of many-body localization in such a system when the interaction is t urned on\, and discuss its implications for a possible many-body intermedia te phase [5]. In particular\, we show that state-of-the-art machine learnin g techniques [6] can help us understand the phase diagram in this intriguin g many-body system. \n\nReferences: \n[1] P. W. Anderson\, Phys. Rev. 109\, 1492 (1958). \n[2] D. M. Basko\, I. L. Aleiner\, and B. L. Altshuler\, Ann . Phys. 321\, 1126 (2006). \n[3] Xiao Li\, Xiaopeng Li\, and S. Das Sarma\, Phys. Rev. B 96\, 085119 (2017). \n[4] H. Luschen et al.\, Phys. Rev. Lett . 120\, 160404 (2018). \n[5] T. Kohlert\, et al.\, to be submitted. \n[6] Y .-T. Hsu\, Xiao Li\, D.-L. Deng\, and S. Das Sarma\, arXiv:1805.12138 (2018 ). LAST-MODIFIED:20180905T193454Z LOCATION:Atlantic 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170905T160000 DTEND;TZID=America/New_York:20170905T170000 RRULE:FREQ=WEEKLY;COUNT=12;BYDAY=TU DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com CREATED:20170809T180226Z DESCRIPTION:Jon McKinney\, University of Maryland \n\nProbing General Relat ivity with the Event Horizon Telescope\n\nThe first resolved images of the strong-gravity region of a black hole will soon be produced by the Event Ho rizon Telescope (EHT). I will discuss the significant instrumental\, obser vational\, and theoretical efforts of the EHT collaboration that have come together in order to probe the strong-field gravity regime of the black hol e in the center of our Galaxy in SgrA* and in the galaxy M87. I will highl ight the challenges of interpreting past and future observations\, which re quire state-of-the-art computational physics simulations of the plasma\, bl ack hole\, and the polarized radiation. Such simulation models reveal a we alth of information that can be used to probe (and potentially test) Einste in's general relativity in the strong-field regime.\n\n LAST-MODIFIED:20170809T180407Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170404T171500Z DTEND:20170404T181500Z DTSTAMP:20260828T094430Z UID:mrbv3bfh999ntr7o527ii9b0h4@google.com CREATED:20170124T151900Z DESCRIPTION:Speaker Name: Professor Chris Jarzynski\n\nSpeaker Institution: UMCP\n\nTitle: Connecting Thermodynamics to Statistical Mechanics in the S trong System-environment Coupling Regime\n\nAbstract: Stochastic thermodyna mics describes how the first and second laws of thermodynamics "scale down" to microscopic systems of interest. In this field\, and in textbook discus sions\, it is customary to use the canonical ensemble to represent the equi librium state of a system that is in contact with a thermal reservoir. Fami liar macroscopic relations between internal energy\, entropy\, free energy\ , heat and work are easily derived from the canonical distribution. It is k nown\, however\, that the canonical ensemble does not accurately describe a nanoscale system that is strongly coupled to its surroundings\, such as a biomolecule in aqueous solution. The usual connection between thermodynamic s and statistical mechanics cannot easily be invoked in this situation. \n\ n I will discuss a modified thermodynamic framework that describes a classi cal system of interest of arbitrary size that is strongly coupled to its th ermal environment. Seven key thermodynamic quantities - internal energy\, e ntropy\, volume\, enthalpy\, Gibbs free energy\, heat\, and work - are defi ned microscopically within this framework. These quantities obey thermodyna mic relations including both the first and second law\, and they satisfy no nequilibrium fluctuation theorems. Additionally\, these key quantities scal e up to their macroscopic values when the system of interest is large. Thus a unifying framework is developed\, which encompasses microscopic\, stocha stic thermodynamics at one end\, and traditional macroscopic thermodynamics at the other. A central element in this approach is a thermodynamic defini tion of the volume of the system of interest\, which converges to the usual geometric definition when the system is large. LAST-MODIFIED:20170330T134709Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180905T190000Z DTEND:20180905T200000Z DTSTAMP:20260828T094430Z UID:78v2oda76qaq92irvqjvnphkfb@google.com CREATED:20180904T195507Z DESCRIPTION:Speaker: Dr. Paul Kolb\, Laboratory for Physical Sciences\n\nTi tle: A Brief Review of Materials: Meta and Otherwise\n\n(refreshments avail able at 2:30 pm) \n\nAbstract: The field of electromagnetic metamaterials h as experienced explosive growth dating from invention of the term by Walser in the year 2000 [1] and Pendry’s proposal of a “perfect lens” with negati ve permittivity and negative permeability [2]. Coupled with the approach of transformation optics\, numerous novel manipulations of light such as nega tive refraction and cloaking have been reported. Some metamaterial concepts have also generated considerable controversy\, at least in some RF circles [3]. As argued by metamaterial “founding father” David Smith\, practical m etamaterial applications have yet to emerge [4]. Toward the goal of practic al RF applications\, I summarize the progress of the metamaterial approach. In the first part of the talk\, I will review ordinary materials and the e xtraordinary electromagnetic properties they exhibit\, some of which are we ll known and others that are not. I will compare and contrast their electro magnetic properties in the RF and optical frequency ranges starting with Ja ckson’s simple model for ε(ω) [5]. I will then explore the consequences of ε(ω) < 1 including anomalous dispersion\, surface waves\, negative refracti on of inhomogeneous waves and superlensing. Other topics covered include an isotropy\, bianisotropy\, spatial dispersion and a brief review of Snoek’s law and the limits of high frequency magnetism [6]. These topics serve as a pretext for the second part of the talk on the realization of engineered p ermittivity and permeability via the metamaterial paradigm. I will start wi th the motivation for pursuing such an approach as well as the earliest app lications such as RF lensing with ε(ω) < 1 dating back at least as far as 1 946 [7]. I will then discuss the hurdles to be overcome in such approaches and the inevitable limitations encountered and end with a summary of progre ss to date with the prospects for future applications. \n\n[1] R. M. Walser \, “Metamaterials: what are they? What are they good for?” Abstract\, APS A nnual March Meeting (2000)\n\n[2] J. B. Pendry\, “Negative Refraction Makes a Perfect Lens\,” Phys. Rev. Lett.\, 85 3966 (2000)\n\n[3] B. E. Spielman\ , et al.\, “Metamaterials: A Rich Opportunity for Discovery or an Overhyped Gravy Train!” IEEE Microwave Magazine 1527-3342\, 8-42 (2009)\n\n[4] D. R. Smith\, “Metamaterials Commercialization: Successes\, Opportunities and Ch allenges\,” In-Q-Tel Focus Day (2013)\n\n[5] J. D. Jackson\, Classical Elec trodynamics\, Second Edition\, John Wiley & Sons\, New York 1975\n\n[6] J. L. Snoek\, “Dispersion and Absorption in Magnetic Ferrites at Frequencies A bove One Mc/s\,” Physica 14\, 207 (1948)\n\n[7] W. Kock\, “Metal-Lens Anten na\,” Proc. IRE Waves & Electrons\, 828-836 (1946)\n\nBiography:\n\nDr. Kol b earned his Ph.D. in Physics from the University of Maryland where he auth ored the thesis “Cryogenic Near-Field Scanning Optical Microscopy.” Coincid entally\, he worked at the Laboratory for Physical Sciences (LPS) as the te chnical lead for advanced research in the area of optical microscopy for mi ssion applications. Subsequently\, he developed proficiency in the computer simulation of metamaterial and other electromagnetic structures. During le ngth details with mission organizations\, he designed dozens of antennas fo r NSA deployments and developed techniques to enhance antenna performance o r to facilitate antenna tuning which are still in use by mission partners t oday. For his contributions\, he was awarded the National Intelligence Meri torious Unit Citation (NIMUC). Upon returning to LPS\, he cofounded the Ele ctromagnetics team (E-team) for advance antenna design and research. In its three year existence\, the E-team has won multiple awards and delivered an tenna designs for systems which been deployed around the world.\n\n\n\n**** *******************************************\n\nFor more information please contact lps_seminar@lps.umd.edu.\n\nNote: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttl e route\; take #105 for the Courtyard Apts. Please use the phone on the lef t hand side of the front door to call the receptionist for entry. LAST-MODIFIED:20180904T195900Z LOCATION: LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170907T123000 DTEND;TZID=America/New_York:20170907T133000 RRULE:FREQ=WEEKLY;UNTIL=20171109T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:6p3km0nd4crncabg1cuoff158h@google.com CREATED:20170830T181615Z DESCRIPTION:Speakers:\nDaniel Lathrop and Itamar Shani\nUniversity of Maryl and | Department of Physics / IREAP\nTitle: Implementing Reservoir Computer s Using Field Programmable Gate Arrays\nAbstract: TBA LAST-MODIFIED:20170830T183129Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171110T211500Z DTEND:20171110T221500Z DTSTAMP:20260828T094430Z UID:1542bv3c32g1s8bgdclt55vot3@google.com CREATED:20171101T123542Z DESCRIPTION:Speaker: Chiao-Hsuan Wang\n\nAffiliation: JQI/QuICS\n\nTitle: A n optomechanical approach to controlling the temperature and chemical poten tial of light\n\nAbstract: Massless particles\, including photons\, are not governed by particle conservation law during their typical interaction wit h matter even at low energies\, and thus have no chemical potential. Howeve r\, in driven systems\, near equilibrium dynamics can lead to equilibration of photons with a finite number\, describable using an effective chemical potential. Here we build upon this general concept with an implementation a ppropriate for a photon-based quantum simulator. We consider how laser cool ing of a well-isolated mechanical mode can provide an effective low-frequen cy bath for the quantum simulator system. We show that the use of auxiliary photon modes\, coupled by the mechanical system\, enables control of both the chemical potential and temperature of the resulting photonic quantum si mulator's grand canonical ensemble.\n\n*Snacks and drinks will be served at 4 pm* LAST-MODIFIED:20171101T123542Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170201T190000Z DTEND:20170201T203000Z DTSTAMP:20260828T094430Z UID:l2jggft35ln8avop7vp4ai05gs@google.com CREATED:20170111T195200Z DESCRIPTION:Speaker: William Donnelly\n\nSpeaker Institution: UC Santa Barb ara\n\nTitle: Gravitational limits on locality\n\nAbstract: There is a fund amental tension between quantum field theory\, whose formulation is built o n algebras of local observables\, and general relativity\, whose symmetries forbid the existence of such local observables. I will explore this tensio n in perturbative quantum gravity coupled to a scalar field\, by constructi ng 'gravitationally dressed' observables that become local when Newton's co nstant is set to zero. The fact that the total energy\, momentum\, and Lore ntz generators are measurable at infinity leads to lower bounds on the stre ngth of the gravitational dressing. In 2+1 gravity with a negative cosmolog ical constant one can derive even stronger nonperturbative bounds. I will s how how gravitational dressing leads to a breakdown of microcausality\, and argue that the principle of locality must be reformulated or abandoned. LAST-MODIFIED:20170120T184352Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171130T203000Z DTEND:20171130T220000Z DTSTAMP:20260828T094430Z UID:780megsgpso1ndb3eehsfacb95@google.com CREATED:20171117T191704Z DESCRIPTION:Speaker: Matthew Yu (UMD) - \nAbstract: We will introduce the c oncept of a topological field theory\, namely Chern-Simons theory\, and des cribe show how some results of the quantum Hall effect can be derived from the Chern-Simons action. I will be following Tong with some additional rem arks on topological field theories. LAST-MODIFIED:20171117T191704Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The quantum Hall effect from topological field theory (cont'd) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161201T203000Z DTEND:20161201T213000Z DTSTAMP:20260828T094430Z UID:pt13rh07484lhcmlcbr51e5khg@google.com CREATED:20161128T155939Z DESCRIPTION:Speaker: Amin Gholampour (UMd)\n LAST-MODIFIED:20161128T155939Z LOCATION:PHY 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:FJRW theory and mirror symmetry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170613T173000Z DTEND:20170613T190000Z DTSTAMP:20260828T094430Z UID:55l20hh074geqdnatd202i1d0c@google.com CREATED:20170605T132059Z DESCRIPTION:Speaker: Feng Yuan\n\nSpeaker Institution: Lawrence Berkeley Na tional Laboratory\n\nTitle: Gluon Tomography at Small-x\n\nAbstract: tk LAST-MODIFIED:20170605T132059Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171030T200000Z DTEND:20171030T210000Z DTSTAMP:20260828T094430Z UID:11rnfitd5220c6372h62hoelsr@google.com CREATED:20171016T164835Z DESCRIPTION:\nTitle : Understanding transcription and splicing heterogeneit y in gene expression\nSpeaker Name: Daniel Larson\nSpeaker Institution : Na tional Institute of Health/National Cancer Institute\nNotes: http://www.mar ylandbiophysics.umd.edu/seminars/\nAbstract : Transcriptional regulation in metazoans occurs through long range genomic contacts between enhancers and promoters\, and most genes are transcribed at irregular intervals in episo dic ‘bursts’ of RNA synthesis. The relationship between these two phenomena and the dynamic regulation of genes in human cells in response to upstream signals is unknown. Here\, we describe the use of single-molecule live-cel l RNA imaging to dissect the regulation of the estrogen-responsive TFF1 gen e under endogenous regulation. Although this gene is highly induced\, we ob serve short active periods and variable inactive periods ranging from minut es to days. The heterogeneity in inactive times gives rise to the widely-ob served ‘noise’ in human gene expression. We also observed that alleles in t he same cell have similar activity\, but the activity ranges among the cell population. Surprisingly\, alleles are not independent but rather show cor related dynamics in the same nucleus\, leading to a regime of ‘coupled intr insic noise’ which dominates expression variability. We derive a mathematic al model of regulation which relates the frequency and stability of gene lo ops to the ability of a cell to ‘sense’ changes in estrogen. \nsnejjar@umd. edu LAST-MODIFIED:20171016T164835Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171003T171500Z DTEND:20171003T181500Z DTSTAMP:20260828T094430Z UID:22bqph5onhjnvh26lesutliuhc@google.com CREATED:20170912T134045Z DESCRIPTION:Speaker: Professor Rigoberto Hernandez\, John Hopkins\n\nTitle: Dynamical Consistency in Sustainable Nanoparticles\n\nAbstract: The nanopa rticles we make today to address problems in energy and human health will e nter the environment tomorrow. But will they be benign or will they lead to deleterious downstream effects to our environment? The Center for Sustaina ble Nanotechnology is developing and benchmarking design principles for sus tainable nanoparticles. In our earlier studies\, [J. Chem. Phys. 138\, 1849 03 (2013)] we discovered that coarse-grained Janus nanoparticles can reprod uce the structure of the fine-grained particles. However\, the dynamics is substantially accelerated. While dissipation can be introduced to rescale t he time scales appropriate to obtain accurate diffusional properties\, it f ails to obtain the correct time scales for higher-order correlation functio ns. This suggests a need for a dynamically consistent coarse-graining that provides the correct time scales for all orders. [J. Phys. Chem. B 120\, 72 97 (2016)] We will report our progress in addressing this challenge in the context of sustainable nanoparticles and use fine-grained representations f or comparison. We will also demonstrate the implications of these methods o n the interactions between nanoparticles and model membranes from Gram-nega tive bacteria. LAST-MODIFIED:20170928T162137Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171030T203000Z DTEND:20171030T213000Z DTSTAMP:20260828T094430Z UID:60so21p6str4e1gq5j5u15ufug@google.com CREATED:20171006T144514Z DESCRIPTION:Title : Origin and Consequences of Large Solar Energetic Partic le Events\nSpeaker Name: Nat Gopalswamy\nSpeaker Institution : NASA Goddard Space Flight Center\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM\nAbstract : Solar energetic particle (SEP) events were first detected some seven decad es ago\, but their impact on human tehnology became evident only recently. The demise of some recent space missions indicate that SEPs have wide-sprea d consequences for space exploration. They can alter the Van Allen radiatio n belts and pose danger to the crew and passengers on board air planes in p olar routes. They can modify the properties of ionosphere and hence affect radio communications. They can even cause ozone depletion in our atmosphere by producing radicals that interact with ozone. How the Sun accelerates th e coronal particles to nonthermal energies has been a mystery. The extensiv e coronagraph observations that became available in the mid-1990s from the Solar and Heliospheric Observatory mission finally helped us make progress in establishing the close connection between SEPs and coronal mass ejection s (CMEs). It is generally accepted that CMEs and solar flares are the two m ain sources of SEPs\, although the ones reaching the interplanetary space s eem mainly accelerated at the shocks driven by CMEs. This point will be ill ustrated using the relation between CME kinematics and spectral properties of SEP events. This lecture aims at providing a summary of our current unde rstanding of the SEP phenomenon.\nslasley@umd.edu LAST-MODIFIED:20171006T144514Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170504T200000Z DTEND:20170504T213000Z DTSTAMP:20260828T094430Z UID:a88hdd3cukpclkk15cn1fqj0sc@google.com CREATED:20170428T140325Z DESCRIPTION:Speaker Name: Nhan V. Tran\n\nSpeaker Institution : Fermilab\n\ nTitle : "A Dijets Renaissance and the Light Dark Matter Connection"\n\nAbs tract : Searching for new physics in dijets at hadron colliders is a classi c well-motivated strategy. However\, as the LHC settles into a long period of data-taking at 13 TeV\, improvements to the traditional search program a re incremental. I will present new techniques to greatly extend the dijet s earch phase space to regions unexplored since the 1980s. I will also detail how such searches have a connection to dark matter searches at the LHC. Fi nally\, I will talk more generally about extending searches for light therm al dark matter to the MeV-GeV range and new experimental approaches such as the proposed LDMX (Light Dark Matter eXperiment). LAST-MODIFIED:20170428T140521Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180420T200000Z DTEND:20180420T204000Z DTSTAMP:20260828T094430Z UID:2aqgtougolcods8o7i2p5bnf3u@google.com CREATED:20180410T183023Z DESCRIPTION:Speaker Name: Dimitri Trypogeorgos\n\nSpeaker Institution: JQI\ n\nTitle: Make your own clock states\n\nAbstract: Decoherence of quantum sy stems due to uncontrolled fluctuations of the environment presents fundamen tal obstacles in quantum science. `Clock' transitions which are insensitive to such fluctuations are used to improve coherence\, however\, they are no t present in all systems or for arbitrary system parameters. In this talk I will discuss how to create a trio of synthetic clock transitions using con tinuous dynamical decoupling. In our spin-1 Bose-Einstein condensate\, this reduces of sensitivity to magnetic field noise of up to four orders of mag nitude. This scheme can be used in a concatenated manner to further reduce the fluctuations in the control fields themselves. These field-insensitive states represent an ideal foundation for the next generation of cold atom e xperiments focused on fragile many-body phases relevant to quantum magnetis m\, artificial gauge fields\, and topological matter.\n\nNotes: Snacks and drinks at 4:00 pm\, talk at 4:10 pm. LAST-MODIFIED:20180410T183125Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170317T170000Z DTEND:20170317T180000Z DTSTAMP:20260828T094430Z UID:bvd05f17v0d8qmp5ngipe7hfjo@google.com CREATED:20170123T202018Z DESCRIPTION:Speaker Name: Michael Rubinstein\, Professor\n\nInstitution: Un iversity of North Carolina\n\nTitle: Surface Brush Sweeps Lungs Clean: Poly mer Physics Helps Us Breathe Easier.\n\nAbstract: The classical view of the airway surface liquid (ASL) of lungs is that it consists of two layers – m ucus and periciliary layer (PCL). Mucus layer is propelled by cilia and rid es on the top of PCL\, which is assumed to be a low viscosity dilute liquid . This model of ASL does not explain what stabilizes the mucus layer and pr events it from penetrating the PCL. I propose a different model of ASL in w hich PCL consists of a dense brush of mucins attached to cilia. This brush stabilizes mucus layer and prevents it penetration into PCL\, while providi ng lubrication and elastic coupling between beating cilia. Both physical an d biological implications of the new model will be discussed.\n\nFor additi onal info\, visit:http://www.mse.umd.edu/events/seminars LAST-MODIFIED:20170126T194458Z LOCATION:2108 Chem/Nuc Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160621T170000Z DTEND:20160621T183000Z DTSTAMP:20260828T094430Z UID:3n68ov2ga37uqhfpt8g36oam5o@google.com CREATED:20160610T200234Z DESCRIPTION:Speaker Name: Amy Nicholson\n\nSpeaker Institution: Lawrence Be rkeley National Laboratory\n\nTitle: Two-Nucleon Observables from Lattice Q CD\n\nAbstract: Lattice QCD has reached a mature stage where precision calc ulations of single-particle observables may be made to complement experimen tal efforts as well as predict new quantities not accessible by experiment. Meanwhile\, studies of multi-particle systems\, particularly those involvi ng nucleons\, are just beginning to come of age. In this talk\, I will pres ent recent results for nucleon-nucleon scattering phase shifts calculated d irectly from QCD at heavy pion mass\, focusing on the necessary advancement s made in operator construction for building two-nucleon systems. Next\, I will discuss the formation of nuclear matrix elements\, and show preliminar y results for matrix elements of importance to several major experimental e fforts related to nuclear parity violation and neutrinoless double beta dec ay. LAST-MODIFIED:20160617T152310Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161017T190000Z DTEND:20161017T203000Z DTSTAMP:20260828T094430Z UID:lvsbt6pebdpucori5amn3vg94k@google.com CREATED:20161005T154648Z DESCRIPTION:Speaker: Alexander Anderson-Natale\n\nSpeaker Institution: KIAS \n\nTitle: Leaving Plato's Cave: Beyond the Simplest Models of Dark Matter and Flavor Symmetry\n \nAbstract: In the allegory of the cave from Plato's Republic\, the inhabitants of the cave are only able to deduce the nature a nd structure of the wider world through the shadows produced by statues of objects and animals from the outside. Our understanding of Dark Matter (DM ) is in a similar state: we can see the indirect effects of DM but without hints of it in experiments\, we are resigned to guessing if these shadows a re due to a WIMP\, or if the dark sector is really as rich as the SM. I will review a concept dubbed 'Plato's Fire' where the non-Abelian discrete group A_4\, which is the symmetry group of the tetrahedron\, can be utilize d to produce the tribimaximal neutrino oscillation pattern. By building ra diative models of neutrino mass\, where the dark sector particles generate neutrino mass through loops\, I will discuss how it is possible to generate a more realistic neutrino mass matrix. By utilizing T' instead of A_4\, i t is also possible to generate a non-trivial quark mixing matrix. The mech anism to generate the quark masses radiatively with a T' flavor symmetry ha s consequences for the dark sector. Notably\, this T' radiative model can contain multiple constituents of cosmological DM and includes additional co lored fermions which could yield interesting signatures at the LHC. LAST-MODIFIED:20161005T154648Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar - Leaving Plato's Cave: Beyond the Simplest Models of D ark Matter and Flavor Symmetry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180226T203000Z DTEND:20180226T213000Z DTSTAMP:20260828T094430Z UID:7vqkpugoh6c4qav7l5269o9k8s@google.com CREATED:20180226T161917Z DESCRIPTION:Sp eaker Name: Gordon Holman

Speaker Institution: NASA-GSFC

Notes: Refreshments available at \;3:0
0 PM
Abstract: High-energy X-rays from solar fla res were merely a curiosity when they were discovered with a Geiger counter on a balloon flight sixty years ago. They are now the primary diagnostic f or accelerated electrons and the hottest plasma produced in flares. I will describe how the analysis of flare X-ray spectra evolved from power-law fit s to spectra that extend over many orders of magnitude in flux to deducing physical properties of accelerated electrons and their environment. These s pectra are now a critical component for obtaining an understanding of both particle acceleration and the evolution of flares. I will conclude with a d iscussion of the importance and future of combined imaging spectroscopy in X-rays and the EUV. LAST-MODIFIED:20180226T162240Z LOCATION:PSC 1136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180329T123000 DTEND;TZID=America/New_York:20180329T133000 DTSTAMP:20260828T094430Z UID:4nod50mb7dng9r7iisvs5lupep@google.com RECURRENCE-ID;TZID=America/New_York:20180329T123000 CREATED:20180125T194828Z DESCRIPTION:Speaker: Mark Swisdak\nUniversity of Maryland - IREAP\nTitle: M agnetic Reconnection and Particle Energization\nAbstract: In many plasmas i n nature magnetic reconnection is the primary process whereby energy stored in the magnetic field is transformed into kinetic and thermal energy. It l ies at the heart of such phenomena as disruptions in fusion experiments\, a uroras\, and solar flares. In addition\, it is strongly suspected that reco nnection plays a significant role in generating energetic particles (i.e.\, non-thermal power laws) in these and other systems. I will discuss the bas ic physics of magnetic reconnection as well as some of the numerical tools (e.g.\, particle-in-cell simulations) used to study its complex interplay o f scales. Finally\, I will discuss recent advances in quantifying how and u nder what conditions reconnection accelerates particles to non-thermal ener gies. LAST-MODIFIED:20180503T161035Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171129T193000Z DTEND:20171129T210000Z DTSTAMP:20260828T094430Z UID:0ka7n6vcr04h3sgs59qjfq4p8q@google.com CREATED:20171107T143006Z DESCRIPTION:Speaker: Brian Swingle\n\nSpeaker Institution: University of Ma ryland\n\nTitle: Entanglement Wedge Reconstruction via Universal Recovery C hannels\n \nAbstract: I will discuss the reconstruction of bulk effective f ield theory within the AdS/CFT correspondence from boundary CFT data. In pa rticular\, I'll focus on the problem of reconstruction of bulk operators us ing data restricted to subregions of the CFT\, a situation known as entangl ement wedge reconstruction. The main tool comes from quantum information sc ience and concerns the problem of optimal recovery from the action of a noi sy quantum operation. LAST-MODIFIED:20171107T143007Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171023T200000Z DTEND:20171023T210000Z DTSTAMP:20260828T094430Z UID:3khd6nfvn2d6u0mg1agfe9fr9s@google.com CREATED:20171013T163440Z DESCRIPTION:Title : How\, when and why does a drug leave the binding pocket of a host protein?\nSpeaker Name: Pratyush Tiwary\nSpeaker Institution : U niversity of Maryland College Park\nNotes: http://www.marylandbiophysics.um d.edu/\nAbstract : Using molecular dynamics (MD) simulations to study the k inetics of drug unbinding is a desirable but difficult task primarily due t o the extremely long timescales involved. Recent progress in enhanced sampl ing methods\, including the development of new sampling approaches\, makes it possible to address this and a range of related problems with full atomi stic resolution\, reaching timescales previously unattainable in MD simulat ions. In this talk\, I will discuss the key principles behind these approac hes. I will then highlight some applications calculating pathways\, timesca les and rate-determining steps of ligand unbinding in various systems inclu ding an FDA-approved anti-cancer drug as it unbinds from host kinase.\nsnej jar@umd.edu LAST-MODIFIED:20171013T163440Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180928T160000Z DTEND:20180928T164500Z DTSTAMP:20260828T094430Z UID:7q1jkn108ik5e0d2kr3b04699e@google.com CREATED:20180919T210317Z DESCRIPTION:Title: Electromagnetically induced transparency in inhomogeneou sly broadened solid-state systems\n\nSpeaker: Haoquan Fan\, Army Research L aboratory and JQI\n\nAbstract: We study\, theoretically and experimentally\ , electromagnetically induced transparency (EIT) in two different solid-sta te systems. We observe EIT lineshapes typical of atomic gases\, including a crossover into the regime of Autler-Townes splitting\, but with the substi tution of the inhomogeneous widths for the homogeneous widths. We obtain qu antitative agreement between experiment and theory for the width of the tra nsparency feature over a range of optical powers and inhomogeneous linewidt hs. We discuss regimes over which analytical and numerical treatments captu re the behavior. As solid-state systems become increasingly important for s calable and integratable quantum optical and photonic devices\, it is vital to understand the effects of the inhomogeneous broadening that is ubiquito us in these systems.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20180919T210505Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170313T230000Z DTEND:20170314T000000Z DTSTAMP:20260828T094430Z UID:qe9sga6q8b6idsct51hc2n0ce0@google.com CREATED:20170313T182439Z DESCRIPTION:Professor S. James Gates\nhttp://publicpolicy.umd.edu/events/jo hn-henry-effect-schooling-and-facing-a2i2tr-disruption LAST-MODIFIED:20170313T182439Z LOCATION:Tyser Auditorium\, Van Munching Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The John Henry Effect: Schooling\, and Facing The A2I2TR Disruptio n TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171215T211500Z DTEND:20171215T221500Z DTSTAMP:20260828T094430Z UID:0i5irm8naductctsjcekkbsshv@google.com CREATED:20171207T164607Z DESCRIPTION:Speaker: Eddie Schoute

Affiliation: QuICS/CS

Titl e: git basics

*Snacks and drinks at 4 pm*

**NOTE: There is an optional workshop after the talk for those who are interested in learnin g more about git and trying it out themselves. It is suggested to bring the ir laptop with them and stay for the workshop (~10-30 minutes).


Abst ract: Version control is a tool used by many programmers in industry to col laborate on software and other text files. And it so happens that LaTeX is also written as a text file! We in academia can use the extensive tooling t hat has been developed to support collaboration---even across continents.

In this lighthearted talk I will present the very basics of using the git version control system. We will learn how to commit your changes to a git r epository\, view what your collaborators have been up to\, and resolve thos e pesky merge conflicts. With git there is also no need any more to save th ose version 6\, 7\, 8-FINAL\, etc. files!

A draft of the talk slides is available at \;https://eddieschoute.github.io/git-basics/ \; \ ;which are subject to change up to the presentation date.

WORKSHOP:After an introductory talk of ~25 minutes we will try our hands on an exe rcise of using git. So please come with a laptop with git installed. Most L inux and OSX system will already have git installed (try running `git` in y our terminal)\, otherwise: \;https://git-scm.com/book/en/v 2/Getting-Started-Installing-Git.
You may also want to familiarize y ourself with the very basics of using your command line: Opening a command terminal\, changing directories (the `cd` command) and listing your current directory contents (the `ls` command on osx/linux and `dir` on windows).

The demo will use a git repository located at: \;https://github.c om/eddieschoute/favorite-animals/ \;Please make a (free) Github acc ount if you wish to try collaborating with others during the demo.

LAST-MODIFIED:20171207T164607Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161026T150000Z DTEND:20161026T160000Z DTSTAMP:20260828T094430Z UID:g3flr6l03acmhe841j3ql4ge18@google.com CREATED:20160524T140828Z DESCRIPTION:Speaker: Laura Mančinska\n\nSpeaker Affiliation: Bristol Univer sity\n\nTitle: Relaxations of Graph Isomorphism\n\nAbstract: The study of e quivalence relations on mathematical structures is a vast theory embracing combinatorics\, optimization\, algebra\, and mathematical logic. In this co ntext\, graph isomorphism and its hierarchy of relaxations constitute a cen tral topic\, not only for its elusive complexity\, but also for its mathema tical richness. We develop a framework which succeeds in capturing salient aspects of the relaxations of graph isomorphism with tools furnished by no nlocal games. This framework allows us to introduce quantum and non-signall ing isomorphism. We show that non-signalling isomorphism is equivalent to f ractional isomorphism as well as exhibit pairs of non-isomorphic graphs whi ch are nevertheless quantum isomorphic. \n\nOur notion of quantum isomorphi sm can also be expressed in terms of a feasibility program over the recentl y introduced completely positive semidefinite cone. We can thus give relaxa tions of quantum isomorphism by considering the same program\, but over the positive semidefinite or doubly nonnegative cones. The doubly nonnegative relaxation turns out to be equivalent to a previously defined notion based on coherent algebras associated to graphs. Interestingly\, the main idea be hind the proof of this purely classical result is based on Choi matrices an d CPTP unital maps.\n\nJoint work with Albert Atserias\, Robert Samal\, Dav id Roberson\, Simone Severini\, and Antonios Varvitsiotis. LAST-MODIFIED:20161019T144218Z LOCATION:3100A Computer and Space Science Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170308T160000Z DTEND:20170308T211500Z DTSTAMP:20260828T094430Z UID:d1b5tvgncd0uko57er3d29j188@google.com CREATED:20170227T155133Z DESCRIPTION:2017 Spring CMTC Symposium \nWednesday\, March 8\n11:00AM-4:15P M\n\nSchedule:\n\nMorning session "Condensates and Machine Learning"\n11:00 -11:45 Aydin Keser “Analogue stochastic gravity in strongly-interacting Bo se-Einstein condensates”\n11:45-12:30 Dong-Ling Deng “Machine learning and artificial neural network quantum states”\n\nBreak 12:30-2\n\nAfternoon se ssion "Majorana Fermions and Beyond"\n2:00-2:45 Will Cole “Finite size sca ling of Majoranas near the Ising critical point”\n2:45-3:30 Ching-Kai Chiu “Conductance of a superconducting Coulomb blockaded Majorana nanowire”\n3: 30-4:15 David Clarke “Parafermions in gapless edge states--disappearing ze ro modes and other puzzles”\n\n\n LAST-MODIFIED:20170227T160000Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Spring CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180501T160000 DTEND;TZID=America/New_York:20180501T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180501T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: Mark Van Raamsdonk\n\nSpeaker Institution: UBC\n\ nTitle: Gravity and Entanglement\n\nAbstract: The AdS/CFT correspondence provides a quantum theory of gravity in which spacetime and gravitational p hysics emerge from an ordinary non-gravitational quantum system with many d egrees of freedom. In this talk\, I will explain how quantum entanglement between these degrees of freedom is crucial for the emergence of a classica l spacetime\, and describe progress in understanding how spacetime dynamics (gravitation) arises from the physics of quantum entanglement. LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170426T150000Z DTEND:20170426T160000Z DTSTAMP:20260828T094430Z UID:b80bgspb65oh6t3m2jbd3l802o@google.com CREATED:20170406T125846Z DESCRIPTION:Speaker: Vedran Dunjko\n\nSpeaker Affiliation: Univ. of Innbruc k\n\nTitle: Quantum information processing\, machine learning and AI \n\nAb stract: The nascent field of Quantum Machine Learning has been generating a substantial buzz in the last few years. The broad theme of this field is t he interplay between the disciplines of quantum information processing (QIP ) and of machine learning (ML). In this talk\, I will review the basic tren ds in this new discipline. I will focus on the ever-growing evidence that n ot only do ML-type applications form one of the best reasons to build quant um computers (barring perhaps quantum simulations and cryptography)\, but M L techniques may significantly help bringing about large-scale quantum comp uters -- making ML and QIP a perfect match. Following this\, I will present a perspective on the field we have developed in Innsbruck\, which broaches the broader topic of the interplay of artificial general intelligence (goi ng beyond standard ML machinery) and quantum mechanics. LAST-MODIFIED:20170419T173857Z LOCATION:3100A Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170315T200000Z DTEND:20170315T210000Z DTSTAMP:20260828T094430Z UID:u9474avv902jft562vsabcblok@google.com CREATED:20170224T140252Z DESCRIPTION:Speaker Name: Prof. Bennet Maruca\n\nSpeaker Institution : Univ ersity of Delaware\n\nTitle : Thermalization of Solar-Wind Ions via Coulomb Collisions\n\nAbstract : The solar wind consists of hot\, magnetized plasm a that supersonically streams from the solar corona into deep space. The io ns therein are rarely in thermal equilibrium because Coulomb collisions\, t hrough which particles exchange energy\, act in the solar wind on timescale s comparable to those of its expansion. Even the two most abundant ion-spec ies\, protons (ionized hydrogen) and alpha-particles (fully ionized helium) \, rarely have equal temperatures. In-situ observations from the Wind space craft's Faraday cups reveal that\, at 1 AU from the Sun\, values of the alp ha-proton temperature-ratio have a complex\, bimodal distribution. To bette r understand this\, a theoretical model was developed to account for collis ional and expansion effects and was then applied to the observations to bac ktrack them from 1 AU to the corona. Remarkably\, the extrapolated alpha-pr oton temperature-ratios show a simple\, monomodal distribution. Thus\, the bimodality observed in the 1-AU distribution may simply result from the inc omplete thermalization of protons and alpha-particles. This result suggests that the relative heating of different ion species in the corona may be mo re uniform than previously believed.\n LAST-MODIFIED:20170224T140351Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170413T163000Z DTEND:20170413T173000Z DTSTAMP:20260828T094430Z UID:omilpvrq58qfrquf2p3tlgdue0@google.com CREATED:20170410T184706Z DESCRIPTION:PHYS 798E and ENEE 698D\n\nTitle: Stochastic Epidemic Outbreaks \, or Why Epidemics Behave Like Lasers\n\nSpeaker: Dr. Ira Schwartz\, Naval Research Laboratory\n\nAbstract: Bursting processes\, characterized by tim e series having randomly distributed large spikes\, are common in populatio n dynamical systems\, such as seasonally driven epidemics\, neurons\, and i nsulin producing beta cells. Such oscillations appear to have chaotic behav ior\, although it is still uncertain how much is due to random fluctuations . Bursting in the presence of noise is also observed in driven lasers. In t his talk\, I will show how noise can excite random outbreaks in simple mode ls of seasonally driven outbreaks\, as well as driven lasers. The models fo r both population dynamics will be shown to share the same class of underly ing topological dynamics\, which plays a major role in the cause of observe d stochastic bursting. Finally\, I will speculate on some ideas of stochast ic epidemic control\, and how to possibly test some ideas in a coupled phys ical optics experiment.\n\nBIO: Dr. Ira Schwartz\, currently head of the No nlinear System Dynamics Section and the Applied Math Task Area Coordinator at the U.S. Naval Research Laboratory\, holds a Ph.D. in applied mathematic s from the University of Maryland (1980). After his tenure as an NIH fellow from 1980-1983\, he began his career at NRL in the Optical Sciences Divisi on. Schwartz is known for his pioneering contributions to the understanding and development of topological insights into the dynamics\, fluctuations\, and control of strongly nonlinear physical and population systems. He is inventor and co-inventor of six patents\, most recently cooperative robotic tracking of Lagrangian Coherent Structures in turbulent flows. Schwartz h as mentored many post doctoral fellows\, graduate and undergraduate student s in the nonlinear sciences\, has been the invited lecturer at numerous maj or physics and applied mathematics symposiums\, and has been awarded more t han 10 meritorious citations given by the U.S. Navy and the American Physic al Society. He currently is a fellow of the American Physical Society.\n\n LAST-MODIFIED:20170410T184706Z LOCATION:John S. Toll Physics Bldg. (PHY 4221) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180509T150000Z DTEND:20180509T160000Z DTSTAMP:20260828T094430Z UID:3be8svuj438kr492ial766cqf0@google.com CREATED:20180501T143052Z LAST-MODIFIED:20180501T191538Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170131T181500Z DTEND:20170131T191500Z DTSTAMP:20260828T094430Z UID:f1n4feko08ab641dpa6pi7omsg@google.com CREATED:20170123T160008Z DESCRIPTION:Speaker Name: Professor Lisa Manning\n\nSpeaker Institution : S yracuse University\n\nTitle : Low-frequency Excitations in Jammed Particula te Matter\n\nAbstract : While all solids resist shear deformations\, they w ill begin to weaken and flow if a large enough shear stress is applied. In disordered solids\, we do not yet fully understand the nature of the low-en ergy excitations that facilitate flow and catastrophic failure. I will disc uss several ongoing projects in our group to address this open question. Th e first project adds a carefully-selected artificial potential to standard particle interactions in simulations in order to isolate localized defects and characterize their properties\, such as sizes and energy barriers. A se cond project focuses on whether the distribution of small forces should be related to low-frequency normal modes in particulate matter. Existing liter ature posits that the two are related\, because particles changes their con tact network (e.g. forces go to zero) at a saddle point (where an eigenvalu e goes to zero). However\, we find that about 90% of contact changes in a s heared\, jammed solid are not associated with saddle points\, raising inter esting questions about recent connections between small force distributions in 2D and 3D and exact infinite-dimensional results from replica theory. A third project focuses on developing simple random matrix models to underst and properties of the low-frequency density of eigenmodes in disordered sol ids. We find that a very simple and analytically tractable class of random matrices recapitulates the eigenmode statistics seen in disordered solids\, and another set recapitulates the scaling of the density of states with co ordination number. \nTitle of Event: LAST-MODIFIED:20170123T160253Z LOCATION: IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160413T150000Z DTEND:20160413T160000Z DTSTAMP:20260828T094430Z UID:o26af6e8pts4gi8rsdvuqas3sk@google.com CREATED:20160128T165324Z DESCRIPTION:Speaker: Hadiseh Alaeian\n\nSpeaker Affiliation: IAP-Universitä t Bonn\n\nTitle: Metafluids and Parity-Time symmetric metamaterials: New op tical material phases and phenomena\n\nAbstract: Textbook conceptions of li ght-matter interactions have been challenged by two recent material advance s - the development of metamaterials and the introduction of parity-time (P T)-symmetric media. Metamaterials allow considerable control over the elect ric and magnetic fields of light\, so that the permittivity\, permeability\ , and refractive index can be tuned throughout positive\, negative\, and ne ar-zero values. Metamaterials have enabled negative refraction\, optical le nsing below the diffraction limit of light and invisibility cloaking. Compl ementarily\, PT-symmetric media allow control over electromagnetic field di stributions in systems with balanced amounts of gain and loss\,\nso that li ght propagation can be asymmetric and directional. They have enabled lossle ss Talbot revivals\, unidirectional invisibility\, and\, combined with non- linear media\, optical isolators.\n\nIn this talk\, I will elaborate on our efforts to make new types of optical and asymmetric\nmetamaterials\, inclu ding liquid metamaterials and parity-time symmetric metamaterials. First\, I will describe our work on the design and demonstration of the first fluid ic metamaterial. Rather than relying on top-down fabrication techniques\, w e utilize protein directed assembly to synthesize the constituent meta-mole cules. Both individual meta-molecules and the bulk metamaterial solution sh ow a strong isotropic magnetic polarizability at optical frequencies. Our c alculations also indicate that these meta-molecules could enable negative r efractive index liquids.\nThen\, I will introduce the new concept of Parity -Time symmetric nanophotonic materials. We show how planar and coaxial meta llo-dielectric structures with balanced inclusion of gain and loss can be u sed for a variety of applications\, including i) directional nanophotonic w aveguides and modulators\; ii) directional metamaterials that have differen t refractive indices when viewed from different sides\; and iii) flat Vesel ago lenses which can overcome the Rayleigh diffraction limit of conventiona l optical microscopy. Further\, I will show how these meta-materials can be used to control the emission of the electric\, magnetic and chiral emitter s and suggest a non-chiral platform for enantio-specific identification and selection. LAST-MODIFIED:20160408T180226Z LOCATION:3100A Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170928T183000Z DTEND:20170928T200000Z DTSTAMP:20260828T094430Z UID:2biu06qohbr2cam7072ptvt3qe@google.com CREATED:20170831T160530Z DESCRIPTION:Speaker: Emanuele Mereghetti\n\nSpeaker Institution: Los Alamos National Lab\n\nTitle: An effective field theory approach to neutrinoless double beta decay\n\nAbstract: Neutrinoless double-beta decay experiments p robe the nature of neutrino masses and the conservation of lepton number. \nA discovery in the next generation of experiments will have profound impl ications: it will demonstrate that neutrinos are Majorana fermions\, shed l ight on the mechanism of neutrino mass generation\, and give insight on lep togenesis scenarios for the generation of the matter-antimatter asymmetry i n the universe. By itself\, however\, the observation of neutrinoless doubl e-beta decay will not immediately point to the underlying physical origin of lepton number violation (LNV). In this talk I will discuss LNV in the fr amework of effective field theories. After introducing LNV interactions at the electroweak scale\, I will discuss their possible manifestations at col liders. I will then match these interactions onto LNV operators at low-en ergy\, going beyond a neutrino Majorana mass. I will derive the operators t hat mediate double-beta decay in chiral effective theory\, for light Majora na neutrino exchange and higher-dimensional LNV operators\, discuss the exi sting constraints on LNV interactions\, and the implications for the interp retation of a signal (or lack of thereof) in the next generation of double- beta experiments. LAST-MODIFIED:20170925T130750Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180316T170000Z DTEND:20180316T180000Z DTSTAMP:20260828T094430Z UID:6s6hpqgd4b9kg84f589ir8m7jv@google.com CREATED:20180306T151259Z DESCRIPTION:Speaker: Lina Zhang\, Distinguished Professor\, Wuhan Univer sity\, China\, Chemistry and Molecular Sciences


Ti tle: Novel Functional Materials Fabricated from Natural Polymers via "Green " Process


Abstract: \;Faced with the serio us challenge of “Environmental Protection and Sustainable Development”\, we have developed a new route to fabricate novel functional materials derived from the renewable natural polymers by using low-cost chemical reagents an d environmentally friendly process. Our innovative solvents such as NaOH/ u rea aqueous solution have been used successfully to dissolve cellulose\, ch itin and polyaniline (PANI) at low temperature\, resulting in a transparent solution. The dissolution at the low temperature was a typical enthalpy-dr iven process\, and was mainly a physical method. The results of SLS\, DLS a nd AFM indicated that an extended wormlike chain conformation of cellulose or chitin/chitosan exists in the dilute solution\, and the nanofibers could be constructed from them in parallel aggregation in the aqueous solution. From the cellulose\, chitin and/or chitosan solutions in the alkali/urea aq ueous system\, the regenerated materials including fibers\, films\, microsp heres\, plastics\, hydrogels and aerogels have been fabricated. Interesting ly\, highly strong multifilament fibers with nanofibril structure were spun successfully from the cellulose and/or chitin solutions in the alkali/urea aqueous system on a small pilot wet-spinning machine. These fibers consist ed of the nanofibers\, and exhibited excellent mechanical properties with h igh tensile strength ( 3.5 cN/dtex for cellulose fibers and 2.5 cN/dtex for chitin fibers). Moreover\, these functional materials fabricated directly from the cellulose solution\, chitin or chitosan solutions\, cellulose/ PAN I solution via physical regenerated methods exhibited excellent mechanical properties\, efficiently self-healable ability\, sensitively force-response ，magnetic-induced delivery\, the good electrochemistry properties &\; hi gh discharge capacity\, the excellent biocompatibility and the cells adhesi on and proliferation viability etc\, and their relationship of structure to properties was revealed. These materials are believed to have promising ap plications in biomedical\, energy storage\, wastewater treatments and texti le manufacturing that will lead to the implementation of a (future) sustain able society. Therefore\, we open up a completely new avenue to construct n ovel materials based on the natural polymers via a “green” process\, leadin g to the promising wide applications. LAST-MODIFIED:20180306T151259Z LOCATION:2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180202T203000Z DTEND:20180202T213000Z DTSTAMP:20260828T094430Z UID:0nuaq6hinfu98uhfp7bmah24b5@google.com CREATED:20180124T173214Z DESCRIPTION:Speaker Name: Dr. Thomas Sunn Pedersen\n\nSpeaker Institution : Max Planck Institute for Plasma Physics \n\n\nTitle: Experimental result s from first operation with a divertor in the Wendelstein 7-X stellarator\n \nAbstract: Stellarators provide a potentially attractive concept for fusi on power production\, owing to their intrinsic steady-state capabilities\, and their lack of current-driven disruptions. This talk will introduce the Wendelstein 7-X (W7-X) experiment\, a highly optimized stellarator that wen t into first operation in 2015-16 and was operated again in 2017. With a 30 cubic meter volume\, a superconducting coil system operating at 2.5 T\, an d steady-state heating capability of eventually up to 10 MW\, it was built to demonstrate the benefits of optimized stellarators at parameters approac hing those of a fusion power plant. The W7-X mission and goals will be pres ented\, and results will be presented from recently obtained results from o peration with the full set of 10 divertor units\, which are passively coole d\, but nonetheless allowed discharges as long as 26 seconds. The more than 30 diagnostics allowed a detailed physics program to be conducted\, and al so confirmed high confinement times (of order 200 ms) with central ion temp eratures of 3.5 keV. LAST-MODIFIED:20180124T173347Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181002T171500Z DTEND:20181002T181500Z DTSTAMP:20260828T094430Z UID:4h8cepc4avuj0io7te62jtnvft@google.com CREATED:20180905T131733Z LAST-MODIFIED:20180905T131733Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T160000Z DTEND:20161205T173000Z DTSTAMP:20260828T094430Z UID:vecorh7ki7srde61s9n89o86ag@google.com CREATED:20161121T214018Z DESCRIPTION:Speaker: Henry Lamm IV\n\nSpeaker Affiliation: Arizona State Un iversity\n\nTitle: True Muonium: Building a New Streetlight\n\nAbstract: Li ke the old adage 'first search for your keys under the streetlight'\, new p hysics searches seek anomalies in existing measurements. But what happens when precision experiments display discrepancies but there are too many pos sible solutions? Then one must build new streetlights to search under. In this talk\, I discuss the on-going work to develop theoretical predication s for the undiscovered bound state true muonium (μ+μ-) in preparation for n ear future experiments. Topics covered include the calculation of the stan dard model predictions (which can require the aid of supercomputers)\, as w ell as how it restricts parameter space of muon problem solutions. LAST-MODIFIED:20161121T214159Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20180220T161500Z DTEND:20180220T171500Z DTSTAMP:20260828T094430Z UID:0hb7t18ut8a5bi8df8sr3ohbbo@google.com CREATED:20180212T162309Z LAST-MODIFIED:20180212T162351Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181105T213000Z DTEND:20181105T223000Z DTSTAMP:20260828T094430Z UID:4bmgiape9a2eggjt511fq9kpmi@google.com CREATED:20180911T221317Z DESCRIPTION:Title: The gamma-ray determination of the Universe's star forma tion history

Speaker: Jus tin Finke\, Space Science division\, Naval Research Laboratory

< a href="https://space.umd.edu/seminars/showAbstract/1105181630">Abstract: The light emitted by all galaxies over the history of the Universe produ ces the extragalactic background light (EBL) at ultraviolet through the opt ical and into the infrared. Gamma rays emitted at cosmic distances are abso rbed by the EBL photons\, producing electron positron pairs\, leaving an im print on the gamma-ray spectra of distance sources. I discuss using the Fer mi Large Area Telescope (LAT ) to measure the absorption features in the gamma-ray spectra of a large sa mple of active galactic nuclei and reconstruct the evolution of the EBL. Th is allows for the reconstruction of the star formation history of the Unive rse throughout cosmic time with results and accuracy comparable to galaxy s urveys. Gamma-ray upper limits on the EBL at the epoch of re-ionization sug gests that the upcoming James Webb Space Telescope will resolve most of the faint galaxies at this epoch.

Notes: Coffee\, Tea &\; Snacks 4:1 5-4:30 PM LAST-MODIFIED:20180911T221317Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160929T163000Z DTEND:20160929T173000Z DTSTAMP:20260828T094430Z UID:a8ho6v7a7bdqbhaofcgv6s9mus@google.com CREATED:20160825T175826Z DESCRIPTION:Speaker Name: Tyrus Berry\n\nSpeaker Institution: George Mason University\n\nTitle: Practical Kalman Filtering with and Without a Model\n\ n LAST-MODIFIED:20160922T172615Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar - Practical Kalman Filtering with and With out a Model TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170614T180000Z DTEND:20170614T193000Z DTSTAMP:20260828T094430Z UID:nulbno2dbujiqflkoc2hc77u0g@google.com CREATED:20170607T143538Z DESCRIPTION:Speaker: Jianhui Zhang\n\nSpeaker Institution: University of Re gensburg\n\nTitle: Pion distribution amplitude from novel approaches in lat tice QCD\n\nAbstract: Recently some novel approaches have been proposed to study parton physics from Euclidean lattice QCD. I'll briefly review these approaches and show\, using the pion distribution amplitude as an example\, how they can be applied to compute parton observables. LAST-MODIFIED:20170607T170137Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180404T150000Z DTEND:20180404T160000Z DTSTAMP:20260828T094430Z UID:51v89p8vc3lck0ucckme4mrdg2@google.com CREATED:20180327T153939Z DESCRIPTION:Speaker: John D. Weeks\, UMCP\, Department of Chemistry and Biochemistry


Title: Quantifying Hydrophobicity and Solvation Using Local Molecular Field Theory


Abst ract: \;Lo cal Molecular Field (LMF) theory introduces a general mapping that accurate ly relates the structure of a nonuniform system with long-ranged Coulomb in teractions in an arbitrary external field (representing\, e.g.\, a hydropho bic or polar solute) to that of a simpler "mimic system" with short ranged intermolecular interactions but in an effective or renormalized field that accounts for the averaged effects of the long ranged interactions. Using a thermodynamic cycle we derive a very simple and analytic expression for the difference in solvation free energy in the full long ranged system and in the simpler mimic system. The theory gives very accurate results for the so lvation of both hydrophobic and hydrophilic solutes of varying sizes in wat er and provides qualitative insights in many other contexts as well. In par ticular\, we show that the renormalized LMF field provides a natural electr ostatics-based mapping of hydrophobic and hydrophilic regions of complex he terogeneous surfaces or biomolecules. This electrostatic scaling can also d ifferentiate between hydrophilic regions that polarize nearby waters in opp osing directions. \; \; LAST-MODIFIED:20180327T153939Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171011T200000Z DTEND:20171011T213000Z DTSTAMP:20260828T094430Z UID:63co9petf3vh8abfubo3t0j3qn@google.com CREATED:20171006T144324Z DESCRIPTION:Title : "Using Neutron Star Mergers to Constrain the Axion"\nSp eaker Name: Anson Hook\nSpeaker Institution : Stanford/UMD\nsmegonig@umd.ed u LAST-MODIFIED:20171006T144324Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170426T200000Z DTEND:20170426T210000Z DTSTAMP:20260828T094430Z UID:kag67k4u1n8sj1e8343p6eikng@google.com CREATED:20170421T124456Z DESCRIPTION:Speaker Name: Dr. Leila Mays\n\nSpeaker Institution : NASA Godd ard\n\nTitle : SEP Modeling Throughout the Inner Heliosphere Based on the E NLIL Global Heliospheric Model\n\nAbstract : The Community Coordinated Mode ling Center (CCMC\, http://ccmc.gsfc.nasa.gov) serves as a community access \npoint to space environment models and as a hub for collaborative developm ent. CCMC is making an effort to make SEP models available for research and operational users soon. We are making steps towards offering a system to r un SEP models driven by a variety of heliospheric models. Understanding gra dual SEP events well enough to forecast their properties at a given locatio n requires a realistic picture of the global background solar wind through which the shocks and SEPs propagate. The global 3D MHD WSA-ENLIL model prov ides a time-dependent background heliospheric description\, into which a sp herical shaped CME can be inserted. Heliospheric models provide contextual information of conditions in the heliosphere\, including the background sol ar wind conditions and shock structures\, and are used as input to SEP mode ls\, providing an essential tool for understanding SEP properties. ENLIL si mulates solar wind parameters and additionally one can extract the magnetic topologies of observer-connected magnetic field lines and all plasma and s hock properties along those field lines. Multipoint observations help const rain simulations and the modeling provides global context for observations. ENLIL “likelihood/all-clear” forecasting maps provide expected intensity\, timing/duration of events at locations throughout the heliosphere with “po ssible SEP affected areas” color-coded based on shock strength. ENLIL simul ations also drive SEP models such as the Solar Energetic Particle Model (SE PMOD) (Luhmann et al. 2007\, 2010) and the Energetic Particle Radiation Env ironment Module (EPREM) (Schwadron et al.\, 2010). SEPMOD injects protons o nto a sequence of observer field lines at intensities dependent on the conn ected shock source strength which are then integrated at the observer to ap proximate the proton flux. EPREM couples with MHD models such as ENLIL and computes energetic particle distributions based on the focused transport eq uation along a Lagrangian grid of nodes that propagate out with the solar w ind. The coupled SEP models allow us to derive the SEP profiles of differen t types of events throughout the heliosphere. This presentation will demons trate case studies of SEP event modeling and solar wind simulations at diff erent observers based on WSA-ENLIL+Cone simulations\, and compare them with multipoint observations. In addition\, an update on the latest model insta llations at the CCMC and on CCMC-led community-wide model validation projec ts will be presented. LAST-MODIFIED:20170421T124610Z LOCATION:ERF 1207\, Large Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180312T150000Z DTEND:20180312T160000Z DTSTAMP:20260828T094430Z UID:1iohk9658uvtote9macc1io95d@google.com CREATED:20180309T154909Z DESCRIPTION:

Kartik Srinivasan \;
< span>

NIST








Abstract: Nonlinear optics in third-order (Kerr) media suc h as optical fibers has been the subject of a widebody of research\, with e ntangled photon pair generation\, squeezing\, third harmonic generation\, p arametric amplification\, and soliton formation amongst the topics studied. Recent advances inintegrated photonics have opened many possibilities to f urther investigate and utilize these phenomena in applications of relevance to quantum science research and time and frequency metrology. These new op portunities stem from the materials and geometries available to nanophotoni cs\, which are more highly nonlinear and admit a greater amount of dispersi on engineering than conventional systems\, as well as the potential to use chip-scale platforms outside of a laboratory environment. In this talk\, I will present an overview of several different nanophotonic technologies we are developing based on chip-integrated Kerr nonlinear microresonators. The se include narrowband photon pair sources for quantum communications based on entanglement-swapping\, in which one photon is produced in the visible a nd the other is produced in the telecom\, quantum frequency converters that make spectrally distinct photons indistinguishable\, and the heterogenous integration of deterministic single-photon emitters based on quantum dots. Finally\, I will discuss our development of octave-spanning frequency combs \, based on the formation of single soliton pulses within a microresonator\ , and how these devices are being used in the creation of precision metrolo gy tools\, including optical frequency synthesizers and chip-scale optical atomic clocks. LAST-MODIFIED:20180309T155002Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180430T110000 DTEND;TZID=America/New_York:20180430T120000 DTSTAMP:20260828T094430Z UID:78g80tul2fkdfl1s84udnu3hmu@google.com RECURRENCE-ID;TZID=America/New_York:20180430T110000 CREATED:20180309T155255Z DESCRIPTION:Speaker: \;Sandro Stringari

Affiliation : \;Universita di Trento

Title: \;Propagation of sound in 2D Bose gases

Abstract:  \; \;After a general introduc tion to the main features of second sound in 3D and 2D superfluids\, I will focus on a recent experiment carried out at the College de France by the t eam \; of Jean Dalibard in a weakly interacting 2D Bose gas. In this ex periment it has been shown that second sound exhibts an unexpected behavior above the Berezinski-Kosterlitz-Thouless transition and does not show any jump\, differently from the predictions of Landau's  \; two-fluid hydro dynamic theory. The experimental results are explained by developing a coll isionless RPA approach and are supported by a stochastic (projected) simula tion employing the Gross-Pitaevskii equation. LAST-MODIFIED:20180420T113249Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161026T180000Z DTEND:20161026T190000Z DTSTAMP:20260828T094430Z UID:qg38l9o5p5s9r5v44veqpl6ous@google.com X-GOOGLE-CONFERENCE:https://plus.google.com/hangouts/_/calendar/bGJrNjYwYTc 1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ.qg38l9o5p5s9r5v 44veqpl6ous CREATED:20161019T172441Z DESCRIPTION:Speaker: Wei Wang\n\nInstitution: University of Oklahoma\n\nTit le: "Topological order of cold hardcore bosonic atoms in the strong-interac tion limit"\n\nAbstract:\n\nThe realization of anyonic statistics in cold a tomic systems is interesting but challenging. In the strongly interacting r egime\, topological properties of cold atoms are closely related to how the y are correlated and their pattern of quantum fluctuation driven by hopping . In this talk\, I will discuss a generic framework to study topological or der of cold hardcore bosons in the strong-interaction limit. The main focus of this talk will be the simplest Z2 topological order. Finally\, proposal s to realize non-abelian anyonic statistics will be discussed.\n\nHosted by Mohammad Faghfoor Maghrebi.\n\nJoin with Google Hangouts: https://plus.goo gle.com/hangouts/_/calendar/bGJrNjYwYTc1YjhqaDdlazZqcjg0amZ1ZTBAZ3JvdXAuY2F sZW5kYXIuZ29vZ2xlLmNvbQ.qg38l9o5p5s9r5v44veqpl6ous?hs=121 LAST-MODIFIED:20161019T172527Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170425T200000Z DTEND:20170425T210000Z DTSTAMP:20260828T094430Z UID:b01r20nq0vm47rp90kqpteo8hg@google.com CREATED:20170315T191854Z DESCRIPTION:Speaker Name: Ellen Williams\n\nSpeaker Institution: Universi ty of Maryland\n\nTitle: Scientific Innovation and the Energy System\n\nAb stract: Extracting useful heat and work from energy sources is essential t o human\ncivilization\, and the energy infrastructure that has developed to meet the world’s needs is immense\, complex and weighted with legacy techn ology. Today issues of energy equity\, environment\, climate change and cli mate adaptation are transforming the context in which the energy system is evolving. Scientific innovation and its use in new energy technologies is k ey to meeting energy needs in a world of increasing demand and increasing c onstraints.\n\nFortunately\, the U.S. infrastructure of research and develo pment has created a\nwealth of tools and approaches that allow new progress . The development of computational methods\, data analytics\, nanoscience\, photonics and systems optimization are just a few of the new opportunities supporting innovations in energy technologies.\n\nExamples of high-potenti al energy innovation will be drawn from the portfolio of the Advanced Resea rch Projects Agency – Energy. Serious choices about research priorities mus t balance the scale of the potential impact\, what new scientific approache s are available to change existing approaches\, and the barriers that might prevent a new technology from reaching application. LAST-MODIFIED:20170315T191854Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180430T200000Z DTEND:20180430T210000Z DTSTAMP:20260828T094430Z UID:3cmsbmq15lmld5jhqpbemlan2a@google.com CREATED:20180405T152211Z DESCRIPTION:Speaker Name: Pierre Ronceray

Speaker Institution: Princeton University

Title: \; The Emergence of Contractility in Biological Fiber Networks

A bstract: Large-scale force generation is essential for biological functions such as cell motility\, embryonic development\, and muscle contraction. In these processes\, active forces generated at the molecular level by motor proteins are transmitted by disordered fiber networks\, resulting in large- scale contractile stresses. I will present a comprehensive theoretical stud y of force transmission in these networks. While the linear response to sma ll forces is remarkably simple\, taking into account the nonlinear properti es of the filaments yields strikingly counter-intuitive effects such as the reversal of extensile forces into contractile ones. These forces are furth ermore amplified as they induce buckling on large scales in the network\, r esulting in large tensile stresses at the macroscopic scale. Our prediction s are quantitatively consistent with experiments on reconstituted tissues a nd actomyosin networks\, and shed light on the role of the network microstr ucture in shaping active stresses in cells and tissue.



Notes: \;http://www.marylandbiophysics.umd.edu/seminars/



 LAST-MODIFIED:20180405T153717Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171025T150000Z DTEND:20171025T160000Z DTSTAMP:20260828T094430Z UID:5ngql9blasm9v70sebk16qehqe@google.com CREATED:20170915T150634Z DESCRIPTION:Speaker: András Gilyén\n\nAffiliation: CWI\n\nTitle: Quantum SD P-Solvers: Better upper and lower bounds\n\nAbstract: Joint work with: Jora n van Apeldoorn\, Sander Gribling and Ronald de Wolf\n\nBrandao and Svore r ecently gave quantum algorithms for approximately solving semidefinite prog rams\, which in some regimes are faster than the best-possible classical al gorithms in terms of the dimension n of the problem and the number m of con straints\, but worse in terms of various other parameters. In this paper we improve their algorithms in several ways\, getting better dependence on th ose other parameters. To this end we develop new techniques for quantum alg orithms\, for instance a general way to efficiently implement smooth functi ons of sparse Hamiltonians\, and a generalized minimum-finding procedure.\n \nWe also show limits on this approach to quantum SDP-solvers\, for instanc e for combinatorial optimizations problems that have a lot of symmetry.\nFi nally\, we prove some general lower bounds showing that in the worst case\, the complexity of every quantum LP-solver (and hence also SDP-solver) has to scale linearly with mn when m\\approx n\, which is the same as classical . LAST-MODIFIED:20170915T150635Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180227T160000Z DTEND:20180227T170000Z DTSTAMP:20260828T094430Z UID:0b1p0cvf89eg0qn8o6ndsabidc@google.com CREATED:20180208T164731Z DESCRIPTION:Speaker Name: Jiehang Zhang

Speaker Institution: UMD
Title: \;Engineered Quantum Spin Systems: Out-of-Equilibrium

Abstract:  \;Quantum mechanics prescribes exponential scaling of t he Hilbert space dimension in many-body systems\, which presents both chall enges and new opportunities for understanding strongly correlated matter\, especially since novel custom-built systems are now available. I will descr ibe such efforts on engineering quantum systems atom by atom\, precisely co ntrolling them with laser-driven interactions\, and increasing the system s ize up to a regime where the capabilities of classical computers are challe nged.

I will focus on the platform of trapped atomic ions\, where a c ombination of excellent coherence time and high-fidelity measurements has e nabled many applications\, ranging from simulating condensed matter physics \, to quantum computation. We represent spin qubits with electronic levels of ions in a Coulomb crystal\, and entangle them through tailored laser pul ses. I will present recent experiments using these systems to study dynamic al phase with individual resolution for more than 50 spins\, as well as non -equilibrium driven matter. I then conclude with future prospects.

LAST-MODIFIED:20180223T195452Z LOCATION:PSC 2136 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Special QTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160411T200000Z DTEND:20160411T210000Z DTSTAMP:20260828T094430Z UID:vujc2nj3t3ol21f2n857t9o31o@google.com CREATED:20160408T175736Z DESCRIPTION:Relativistic Magnetic Reconnection and the Intense Gamma-ray Fl ares in the Crab Nebula\nSpeaker: Dr. Dmitri Uzdensky (University of Color ado-Boulder)\nRefreshments @ 3:30 pm\n\nIntense and rapid high-energy gamma -ray flares\, discovered recently in the Crab Nebula by the AGILE and FERMI space telescopes\, have excited the high-energy astrophysics community. Th eir very rapid (hours) variability and the very high (hundreds of MeV) phot on energies (believed to be synchrotron) pose interesting challenges to mod ern theories of relativistic particle acceleration and radiation. In partic ular\, the peak photon energy exceeds the standard ~ 100 MeV upper energy l imit for synchrotron photons dictated by the synchrotron radiation reaction and operating in all traditional models of particle acceleration. In this talk I will argue that collisionless magnetic reconnection — a fundamental plasma process of rapid magnetic topology rearrangement accompanied by a v iolent magnetic energy release — enables the most energetic particles to ci rcumvent this standard energy limit and thus provides an attractive and pla usible explanation for the Crab flares. I will present the results of our a nalytical studies and kinetic numerical simulations of extreme particle acc eleration in relativistic pair-plasma reconnection that support this pictur e. Some of these studies were done with our new radiative relativistic part icle-in-cell (PIC) code Zeltron\, which incorporates the synchrotron radiat ion-reaction force and self-consistently calculates the resulting radiation signatures. We found that reconnecting field configuration focuses the mos t energetic particles into tight beams\, swaying within the reconnection cu rrent layer. This kinetic beaming leads to brief\, intense flares of observ able high-energy synchrotron radiation whenever the beams cross our line of sight. Furthermore\, the accelerated particles are drawn deep inside the l ayer where the magnetic field is weak and hence radiation reaction is suppr essed. Eventually\, they escape the layer and radiate synchrotron radiation above the standard radiation-reaction limit\, powering the observed Crab f lares. I will also review the recent general progress in our understanding nonthermal particle acceleration in relativistic reconnection and in chara cterizing it quantitatively. Finally\, I will discuss some outstanding chal lenges and open questions\, and will identify promising directions for futu re research\, in particular\, rapid reconnection onset via disruption of gr adually forming current sheets by the tearing/plasmoid instability. LAST-MODIFIED:20160408T175938Z LOCATION:Physical Sciences Complex Room 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170421T161500Z DTEND:20170421T171500Z DTSTAMP:20260828T094430Z UID:hcphecvfh4hekdh8njgtdam070@google.com CREATED:20170412T141849Z DESCRIPTION:Speaker Name: Robert Throckmorton\n\nSpeaker Institution: CMTC and JQI\n\nTitle: Faster Pulse Sequences for Performing Arbitrary Rotations in Singlet-Triplet Qubits\n\nAbstract: We present new composite pulse sequ ences for performing arbitrary rotations in singlet-triplet qubits that are faster than existing sequences. We consider two sequences for performing a z rotation\, one that generalizes the Hadamard-x-Hadamard sequence\, and another that generalizes a sequence by Guy Ramon (G. Ramon\, Phys. Rev. B 8 4\, 155329 (2011)). We determine the time required to perform each sequenc e\, and find that our "generalized Hadamard-x-Hadamard" sequence can always be made faster than the "generalized Ramon sequence". We then present sim ilar sequences for performing x rotations\, one that generalizes the Hadama rd-z-Hadamard sequence and another that is based on Ramon's z rotation sequ ence. In this case\, we find that the "Ramon-like" sequence is faster. We also present sequences for performing other rotations. We then find versi ons of these sequences dynamically corrected for noise-induced errors using SUPCODE (X. Wang et. al.\, PRA 89\, 022310 (2014)).\n\nReference: C. Zhang \, RET\, X-C. Yang\, X. Wang\, E. Barnes\, and S. Das Sarma\, arXiv:1701.03 796 (submitted to PRL)\, plus currently unpublished work. LAST-MODIFIED:20170412T141849Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180205T210000Z DTEND:20180205T220000Z DTSTAMP:20260828T094430Z UID:164lmlh52ml5gb1aosr87o0lvo@google.com CREATED:20180119T144852Z DESCRIPTION:Speaker Name: Mihaela Mihailescu

Speaker Institution : I BBR/NIST

Notes: http://www.marylandbiophysics.umd.edu/seminars/spring2018.php
< br>Title: Exploring the Interplay of Host Defense Mechanisms at Biological Membranes: Insights from studies of antimicrobial Piscidins
Abstract : Antimicrobial peptides (AMPs) play an integral role in the fight against invading pathogens. To fully exploit their potential as prot otypes for novel antimicrobials the molecular basis of their mechanism of a ction\, which includes disrupting plasma membranes\, must be understood. Th e host-defense peptides piscidin P1 and piscidin P3\, that were first isola ted from the mast cells of striped bass\, display potent antimicrobial acti vity against a large number of Gram-positive and -negative bacteria\, inclu ding methicillin-resistant S. aureus (MRSA)\, viruses such as HIV-1\, fungi \, yeasts\, and cancer cells. The two 22-residue\, helical\, cationic pepti de differ only slightly in amino-acid sequence\, but P1 is more potent than P3. Solid state NMR showed that P1 and P3 adopt a very similar helical str ucture in fluid lipid membranes. However\, neutron diffraction with specifi c deuterium labeling reveal differing conformations of the two peptides in membrane and offer insights on the structural interactions of the peptides with membranes and water\, at the molecular level. The contrasting behavior of the two AMP homologues offers a unique opportunity to examine the struc ture-function relationship of membrane-active peptides. LAST-MODIFIED:20180123T140025Z LOCATION:0112 Marker Seminar Room\, Chemistry Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180828T171500Z DTEND:20180828T181500Z DTSTAMP:20260828T094430Z UID:344jcqbcfir6i73ltmeuhccsgs@google.com CREATED:20180821T134853Z LAST-MODIFIED:20180823T123915Z LOCATION:1116 IPST Conference room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170413T193000Z DTEND:20170413T210000Z DTSTAMP:20260828T094430Z UID:ba828hrfo9osr0jfglmmg3p1io@google.com CREATED:20170407T134746Z DESCRIPTION:Speaker: Tristan Hubsch (Howard and UMCP) - \nAbstract: We will discuss how the twists that arise from a U(1)-current in superconformal N= 2 field theory relate to what we know as the A- and B-models in superstring theory. The key reference is E. Witten's paper "Phases of N=2 theories in two dimensions"\, Nuclear Phys. B 403 (1993)\, no. 1-2\, 159-222. \n LAST-MODIFIED:20170407T134746Z LOCATION:PHYS 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Topological twists in N=2 string theory TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20160922T163000Z DTEND:20160922T180000Z DTSTAMP:20260828T094430Z UID:243a8un59uvi19m66flun73sn4@google.com CREATED:20160912T165441Z DESCRIPTION:Speaker Name: Oren Raz\n\nSpeaker Institution : University of M aryland\n\nAbstract: Under certain conditions\, it takes less time to cool a hot system than to cool the same system initiated at a lower temperature. This phenomenon – the “Mpemba Effect”\, has been observed in a variety of systems\, including water\, magnetic alloys and carbon nano-tube resonators . So far\, no single generic mechanism to explain this counter-intuitive be havior was suggested. Using the theoretical framework of nonequilibrium the rmodynamics\, we construct a minimal model that describes this behavior and illustrates the fundamental principles behind it. We derive a sufficient c ondition for this effect in Markovian systems\, and predict an inverse effe ct: it might take less time to heat a cold system than a warmer one. \n\nNo tes: For more information\, please visit our website: http://ireap.umd.edu/ events/index.php?mode=4&id=11787 LAST-MODIFIED:20160912T174508Z LOCATION:ERF 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170425T150000Z DTEND:20170425T161500Z DTSTAMP:20260828T094430Z UID:u36m3p56vu1kerujbqh4udu00c@google.com CREATED:20170120T212728Z DESCRIPTION:Speaker: Aris Alexandradinata (Yale)\n\nTitle: Orbital magnetiz ation\, geometric phase\, and the modern theory of magnetic breakdown\n\nAb stract: The semiclassical theory of a Bloch electron in a magnetic field no w encompasses modern notions that lie beyond the Peierls-Onsager theory -- namely\, the orbital magnetization and geometric phase play crucial roles i n our refined understanding of magnetic phenomenon. Lying beyond this semic lassical theory is the quantum description of field-induced tunneling betwe en semiclassical orbits\, known as magnetic breakdown. I will show how to s ynthesize the semiclassical notions of orbital magnetization and geometric phase\, with the quantum notion of tunneling -- specifically\, I will prese nt generalized\, Bohr-Sommerfeld quantization conditions that synthesize al l three notions. These quantization conditions provide an analytic and quan titative understanding of magnetic energy levels\, as well as makes refined predictions about magnetic oscillatory phenomenon of the de-Haas-van-Alphe n type. This synthesized theory is essential to describe a host of topologi cal bandstructures with unremovable geometric phase that also unavoidably u ndergo breakdown. Specific case studies are discussed for topological metal s near a metal-insulator transition\, the surface of topological crystallin e insulators\, as well as tilted Dirac fermions.\n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Ching-Kai Chiu\n\nhttp://www.physics.umd.edu /cmtc/seminars.html LAST-MODIFIED:20170414T222309Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161129T181500Z DTEND:20161129T191500Z DTSTAMP:20260828T094430Z UID:1br44rv6vr0cc01p7268nsgpr0@google.com CREATED:20161122T140321Z DESCRIPTION:Speaker Name: Professor Jeremy England\n\nSpeaker Institution : MIT\n \nTitle : Statistical Physics of Adaptation\n\nAbstract: Many-body systems that are driven far from thermal equilibrium can exhibit a seemingl y endless range of different "self-organization" phenomena\, whether during long periods of transient relaxation over a hierarchy of timescales\, or i n an ergodic steady-state. Indeed\, the range of possible behaviors is so d iverse that it includes (but is not limited to) everything that living thin gs do! In the face of such phenomenological diversity\, it is difficult to articulate any thermodynamic commonality that might be analogous to the ten dency to minimize free energy observed in equilibrated systems. Here\, we t ry to exploit recent fundamental progress in our understanding of far-from- equilibrium dynamics to develop predictive thermodynamic principles for a g eneral class of driven self-organized systems. We find there is a language in which Darwinian selection in biological systems may be thought of as a s pecial case of a more general physical tendency for "dissipative adaptation " that arises from the correlation between irreversible changes in shape an d the absorption of external work. We close by exploring this hypothesis in different simulation frameworks.\n\n\n LAST-MODIFIED:20161128T154117Z LOCATION:IPST Conference Room 1116 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161205T200000Z DTEND:20161205T213000Z DTSTAMP:20260828T094430Z UID:em90ir2p8rjnqdb1eh2cnosvro@google.com CREATED:20161128T165126Z DESCRIPTION:Speaker: Stefania Gori\n\nSpeaker Institution: University of Ci ncinnati\n\nTitle: Collider signatures of flavorful Higgs bosons\n \nAbstra ct: The last four years Higgs measurements have established that the main o rigin of the weak gauge bosons' mass as well as of the third generation qua rk and lepton masses is the 125 GeV Higgs boson. Little is known about the origin of mass of the 1st and 2nd generation fermions. We discuss the pheno menology of a class of two Higgs doublet models (2HDMs) with a non-standard Yukawa sector. One Higgs is mainly responsible for the masses of the weak gauge bosons and of the 3rd generation fermions\, while the second Higgs pr ovides mass for the lighter fermion. We will discuss the characteristic col lider signatures of the setup that differ significantly from well studied 2 HDMs with natural flavor conservation or minimal flavor violation. New prod uction mechanisms for the heavy scalar\, pseudoscalar and charged Higgs inv olving 2nd generation quarks can become dominant. New flavor violating heav y Higgs decays are naturally the smoking gun of this class of models. Furth ermore\, we will highlight the characteristic signatures of the model at lo w energy\, focusing in particular on rare B meson decays. LAST-MODIFIED:20161128T165126Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171102T193000Z DTEND:20171102T210000Z DTSTAMP:20260828T094430Z UID:66t4gfi8sh1pcgsssn51qpj823@google.com CREATED:20171024T195048Z DESCRIPTION:Speaker: Freddy Cisneros (UMD Physics) - \n LAST-MODIFIED:20171024T195048Z LOCATION:Physics Bldg 1117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The bulk-boundary correspondence TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170928T180000Z DTEND:20170928T193000Z DTSTAMP:20260828T094430Z UID:1vmk1rreh458qp4lkcrkuu7qoo@google.com CREATED:20170908T195324Z DESCRIPTION:SPEAKER: Dr. Fahad Mahmood\, Johns Hopkins University \n\nTITLE : “Locating the missing superconducting electrons in overdoped cuprates” \n \nABSTRACT: High-Tc superconductivity in overdoped cuprates has been widely believed to be within the standard Bardeen-Cooper-Schrieffer (BCS) paradig m describing conventional superconductors. This view was strongly challenge d by recent measurements of the superfluid density which found that even as the carrier concentration increases on the overdoped side\, the superfluid density decreases – Cooper pairs seem to be ‘missing’ from the condensate. Finding these ‘missing’ carriers and understanding why they fail to conden se are crucial questions in explaining the superconducting transition in hi gh-Tc cuprates. In this talk I will discuss our recent measurements of the superfluid stiffness in MBE grown films of the overdoped cuprate La2-xSrxCu O4 over a broad frequency range (kHz to THz). By combining kHz range mutual inductance measurements and time-domain THz spectroscopy on the same films \, we track and quantify the distribution of carriers. In this way we direc tly locate the “missing” carriers and discover that they display an exceedi ngly large metal-like response even deep into the superconducting state. An analysis of this distribution in terms of a quantum Debye-Waller factor de monstrates the prominent role of quantum superconducting phase fluctuations as the critical doping is approached. \n\nHost: Rick Greene LAST-MODIFIED:20170908T195324Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Dr. Fahad Mahmood\, Johns Hopkins University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170303T171500Z DTEND:20170303T181500Z DTSTAMP:20260828T094430Z UID:c3o3q67bmtc0umslv2v7qironk@google.com CREATED:20170222T145153Z DESCRIPTION:Speaker Name: Hilary Hurst\n\nSpeaker Institution: JQI & CMTC\n \nTitle: Kinetic theory of dark solitons with tunable friction\n\nAbstract: We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose gas and a non-interacting Fermi gas. The fermions a ct as impurity atoms\, not part of the original condensate\, that scatter o ff of the soliton. We investigate semiclassical dynamics of the dark solito n\, a particle-like object with negative mass\, and calculate its friction coefficient. Surprisingly\, the amount of friction depends on the ratio of interspecies (impurity-condensate) to intraspecies (condensate-condensate) interaction strengths. By tuning this ratio\, one can access a regime where the friction coefficient vanishes. Using this friction coefficient we deve lop a complete kinetic theory of the soliton\, including the exact probabil ity distribution function for the soliton. We find that both the trajectory and lifetime of the soliton are altered by friction\, and in the presence of friction and an external confining potential the soliton can undergo Bro wnian motion. These results agree qualitatively with experimental observati ons by Aycock\, et. al (PNAS 2017) in a similar system with bosonic impurit y scatterers. LAST-MODIFIED:20170222T145153Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181002T200000Z DTEND:20181002T210000Z DTSTAMP:20260828T094430Z UID:E0A6029F-02D0-40AD-96BC-25D085199878 CREATED:20180806T143721Z DESCRIPTION:Speaker: Juan Maldacena\, Institute for Advanced Study\, Prince ton\n\nTitle: Black Holes and the Structure of Spacetime\n\nAbstract: Black holes are fascinating objects predicted by Einstein's theory of general re lativity. Though they were initially viewed as pathological and unphysical solutions\, they were later understood to be a solid and generic outcome of the theory. They are objects where the distortion of space and time is so extreme that it defies imagination. Black holes give rise to paradoxes who se resolution requires us to modify our conception of spacetime. We will re view how black holes went from being apparently unphysical solutions to a c entral tool for discovering new perspectives on the nature of spacetime. LAST-MODIFIED:20180829T125241Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171110T110000 DTEND;TZID=America/New_York:20171110T115000 DTSTAMP:20260828T094430Z UID:6tp35sjf9spsj8pp6oet807q6h@google.com RECURRENCE-ID;TZID=America/New_York:20171103T110000 CREATED:20170925T122219Z DESCRIPTION:When: Fridays 11am-11:50am \nJustin Terry\, organized by Dan La throp\nSeventh lecture: Applications of Machine Learning (finance\, medicin e\, physics\, material physics\, AR\, law\, robots\, chaos)\n\nCourse descr iption: This short course covers the fundamentals of machine learning\, ass uming the typical background and motives of a physicist. It's goal is to gi ve those who attend an understanding of the field and its capabilities\, as well the tools to learn the necessary extensions of the topic to apply it to their physics research. Lectures will include introductions to Python\, Linux\, neural nets\, deep learning\, natural language processing\, imagine recognition/computer vision\, and AI safety.\n\nRSVP for the first friday here: http://bit.ly/2xgpvDE\njustinkterry@gmail.com LAST-MODIFIED:20171020T151807Z LOCATION:Edward St. John 2208 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Short Course on Machine Learning for Physicists TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170918T110000 DTEND;TZID=America/New_York:20170918T120000 DTSTAMP:20260828T094430Z UID:6qf653rfdkb5dib0883rg27ide@google.com RECURRENCE-ID;TZID=America/New_York:20170918T110000 CLASS:PUBLIC CREATED:20170906T143653Z DESCRIPTION:Speaker: Brian Swingle\, UMD\nTitle: Quantum Information Scramb ling\nAbstract: This talk concerns the notion of quantum information scramb ling and its relation to thermalization and quantum chaos. I will show how we can diagnose and calculate the rate of information scrambling and how we can measure scrambling using quantum control techniques. Finally\, I will discuss several recent experiments in this direction as well as what we hop e to learn more broadly by studying scrambling. LAST-MODIFIED:20170913T155743Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20171003T160000 DTEND;TZID=America/New_York:20171003T170000 DTSTAMP:20260828T094430Z UID:2im6mg2s47fqebvrqa0toh7gd8@google.com RECURRENCE-ID;TZID=America/New_York:20171003T160000 CREATED:20170809T180226Z DESCRIPTION:Michelle Girvan\, University of Maryland \nPhase Transitions an d Criticality in Biological Networks: Implications for Genes and Neurons\n\ nExperimental evidence suggests that\, in order to maximize performance\, b iological networks often operate near the brink of failure. Because of the connections between such "tipping points" and the critical points of second order phase transitions\, the methods of statistical and nonlinear physics are useful for studying these systems. My research in this area explores p hase transitions and critical dynamics in both networks of genes and networ ks of neurons. Modeling phase transitions in gene regulatory networks has led us to propose a general mechanism underlying some cancers. Modeling pha se transitions in neuronal networks has allowed us to identify features of the brain's wiring that are key for optimal information processing. For bot h networks of genes and networks of neurons\, studying how evolution shapes the path to criticality gives us insights into robustness and fragility in these systems. \n\n LAST-MODIFIED:20170913T194107Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170721T200000Z DTEND:20170721T210000Z DTSTAMP:20260828T094430Z UID:426075e8a6j41os55nf77jos6j@google.com CREATED:20170713T130335Z DESCRIPTION:Speaker: Paraj Titum\n\nInstitution: JQI & QuICS\n\nTitle: Peri odically Driven Quantum Systems\n\nAbstract: Periodically driven systems (a lso known as Floquet systems) have seen a lot of recent theoretical and exp erimental interest. In this talk\, I will provide a survey of various examp les of Floquet systems. I will start by explaining basic Floquet theory\, a nd describe how to obtain the dynamics of such driven systems. Then I will show how periodic driving can be used to tune a trivial system into a desir ed topological phase of matter. Finally\, I will discuss interacting Floque t phases and the problem of heating in these systems. If time permits\, I w ill describe the recent realization of a new phase of matter - time crystal s.\n\n(The JQI summer school is for students and postdocs\, but others are welcome to join for refreshments and snacks afterward\; Discussion with ref reshments and snacks at 5:00 pm) LAST-MODIFIED:20170713T130410Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Summer School TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20171101T193000Z DTEND:20171101T203000Z DTSTAMP:20260828T094430Z UID:35kge4orqjt7tsog7tuu6rfuc4@google.com CREATED:20171026T143245Z DESCRIPTION:Speaker Name: Dr. Yohei Kawazura\n\nSpeaker Institution : Unive rsity of Oxford\n\nTitle : Development of a hybrid gyrokinetic ion and isot hermal electron fluid code and its application to turbulent heating in astr ophysical plasma\n\nAbstract : Understanding the ion-to-electron temperatur e ratio is crucial for advancing our knowledge in astrophysics. Among the p ossible thermalization mechanisms\, we focus on the dissipation of Alfvenic turbulence. Although several theoretical studies based on linear Alfven wa ve damping have estimated the dependence of heating ratio on plasma paramet ers\, there have been no direct nonlinear simulation that has investigated the heating ratio scanning plasma parameters. Schekochihin et al. (2009) pr oved that the turbulent heating ratio is determined at the ion Lamor radius scale. Therefore\, we do not need to resolve all the scales up to the elec tron dissipation scale. To investigate the ion kinetic scale effectively\, we developed a new code that solves a hybrid model composed of gyrokinetic ions and an isothermal electron fluid (ITEF). The code is developed by inco rporating the ITEF approximation into the gyrokinetics code AstroGK (Numata et al.\, 2010). Since electron kinetic effects are eliminated\, the new hy brid code runs approximately 2 sqrt(mi/me) times faster than full gyrokinet ics codes. We will present linear and nonlinear benchmark tests of the new code and our first result of the heating ratio sweeping the plasma beta and ion-to-electron temperature ratio. \n LAST-MODIFIED:20171026T143404Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180402T200000Z DTEND:20180402T210000Z DTSTAMP:20260828T094430Z UID:5oar6ocbrkguv1061bde1ec75p@google.com CREATED:20180223T183136Z DESCRIPTION:Speaker Name: \; \;Gaurav Arya

Speaker Institution: \; \;Duke University

Title : Computational Modeling of DNA Organization: From Nucleosomes to Chromatin Fibers to Chromosomes
Abstract: \;& nbsp\; \;In eukaryotic organisms\, the genome is organized into repeating units called nucleosomes consisting of DNA wrapped around an octamer of histone proteins. The array of nucleosomes is folded into a chromatin fiber that undergoes further looping to eventua lly yield chromosomes. Such hierarchical organization of DNA is critical fo r the packaging of meters-long DNA into micron-sized cell nuclei and for th e regulation of DNA transcription\, replication\, and recombination process es. This talk will present an overview of the computational approaches we h ave developed over the years for modeling DNA organization at the different hierarchical levels. At the nucleosome level\, we have developed an experi mentally-trained coarse-grained model that provides insights into the force d unraveling of nucleosomes. At the level of the chromatin fiber\, we have developed a mesoscopic model that reveals its polymorphic architecture and elucidates the role of physiological salt\, histone tails\, and linker hist one in stabilizing its compact state. The model also provides insights into chromatin supercoiling and propagation of torsional stresses in chromatin. At the level of chromosomes\, we have developed computational approaches f or analyzing contact frequency and sequence data from chromosome conformati on capture experiments to recover chromatin 3D conformations and enzyme cle avage fractions. \; LAST-MODIFIED:20180223T183340Z LOCATION:0112 Marker Seminar\, Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181204T181500Z DTEND:20181204T191500Z DTSTAMP:20260828T094430Z UID:4slvru5gh7ucb46phj92f6ecfu@google.com CREATED:20180905T133333Z LAST-MODIFIED:20180905T133334Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180406T190000Z DTEND:20180406T203000Z DTSTAMP:20260828T094430Z UID:3undsmfdpblncmel8i57ee2pkf@google.com CREATED:20180309T152542Z DESCRIPTION:

Speaker: \;Charles Cao

Speaker Inst itution: CalTech

Title: Bulk Entanglement Gravity and Radon Transfor m: Towards Finding Einstein's Equation in Hilbert Space

Abstract: We consider the emergence from quantum entanglement of spacetime geometry in a bulk region. For certain classes of quantum states in an appropriately fa ctorized Hilbert space\, such as ones generated by random tensor networks\, an emergent spatial geometry along with its best-fit dimensionality can be determined from an amorphous configuration. We show how Radon transforms c an be used to convert quantum mutual information data into a spatial metric . Under a particular set of assumptions\, the time evolution of such a stat e traces out a spacetime geometry\, and we argue using a modified version o f Jacobson's "entanglement equilibrium" that the geometry should obey Einst ein's equation in the weak-field limit near Minkowski spacetime.The results of emergent geometry and gravity can also be applied to tensor networks. I t suggests that more generic complex quantum systems\, such as subsystem qu antum error correction codes\, can contain natural ingredients necessary fo r emergent gravity. LAST-MODIFIED:20180309T152552Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170520T150000Z DTEND:20170520T200000Z DTSTAMP:20260828T094430Z UID:h9jcikon98ql3vs7fsk47mems8@google.com CLASS:PUBLIC CREATED:20170510T184803Z DESCRIPTION:Registration required\n\n11:00 AMBBQ Lunch\n\n1:00 PMGuido Paga no\nObservation of a discrete time crystal in a trapped ion quantum simulat or\n\n1:20 PMEfim Rosenbaum\nLyapunov Exponent and Out-of-Time-Ordered Corr elator’s Growth Rate in a Chaotic System\n\n1:40 PMPablo Solano\nSuper- and Sub-radiance reveal infinite-range interactions along a nanofiber\n\n2:00 PMSunil Mittal\nTemporal and spectral manipulations of correlated photons\n \n\n2:40 PMZhexuan Gong\nEntanglement area laws for long-range interacting quantum systems\n\n3:00 PMYen-Hsian Lin\nTBA\n\n3:20 PMAna Valdes-Curiel\nF ourier transform spectroscopy of a spin-orbit coupled Bose gas\n\n3:40 PMDo ng-Ling Deng\nMachine learning and quantum entanglement\n\n4:15 PMVolleybal l Activity (located by Recreation Center) LAST-MODIFIED:20170511T202844Z LOCATION:PSC lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI 10th Anniversary TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171108T210000Z DTEND:20171108T223000Z DTSTAMP:20260828T094430Z UID:563aqss1mtpupjjt7n34jklohd@google.com CREATED:20171103T134643Z DESCRIPTION:Speaker Name: Jonathan Eisch\n\nSpeaker Institution : Iowa Stat e University\n\nTitle : "The ANNIE Experiment"\n \nAbstract : The Accelerat or Neutrino Neutron Interaction Experiment (ANNIE) is a new water-Cherenkov neutrino detector at Fermilab. It aims to measure the neutron yield of neu trino-nucleus interactions. As future experiments seek to make more precise measurements of neutrino oscillations\, improving estimation of the initia l neutrino energy will be key. Located in the Booster Neutrino Beamline\, t he 30 ton detector will be the first to use large area picosecond photodete ctors (LAPPDs) to allow detailed timing-based event reconstruction of the i nitial and secondary particle interactions. It will also extend traditional water-Cherenkov charged-particle detection by using gadolinium-enhanced wa ter to capture and detect the otherwise invisible neutrons produced in comp lex neutrino-nucleus interactions. The number and energy of these final-sta te neutrons help constrain the type of interaction and the atomic kinematic s of the target nucleus\, which are major sources of uncertainty in event r econstruction and simulation. The measurement of neutrino-induced neutron p roduction also has implications for the next generation of proton decay exp eriments and for the detection of the diffuse supernova neutrino background .\n LAST-MODIFIED:20171103T134810Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160414T123000 DTEND;TZID=America/New_York:20160414T133000 DTSTAMP:20260828T094430Z UID:p7s8fuuhv83gnrsjol88ha3to8@google.com RECURRENCE-ID;TZID=America/New_York:20160414T123000 CREATED:20160328T173052Z DESCRIPTION:Speaker Name: Denys Bondar\n\nSpeaker Institution: Princeton U niversity\, Department of Chemistry\n\nTitle: Measurement inspired modeling of quantum and classical dynamical systems \n\nAbstract: In this talk\, I will provide an answer to the question: "What kind of observations and assu mptions are minimally needed to formulate a physical theory?" Our answer to this question leads to the new systematic approach of Operational Dynamica l Modeling (ODM)\, which allows to deduce equations of motions from time ev olution of observables. Using ODM\, we are not only able to re-derive well- known physical theories (such as the Schrodinger and classical Liouville eq uations)\, but also infer novel physical dynamics (and solve open problems) in the realm of non-equilibrium quantum statistical mechanics.\nWe have st udied large\, heterogeneous populations of discrete chemical oscillators (~ 100\,000) to characterize two different types of density-dependent transiti ons to synchronized behavior\, a gradual Kuramoto synchronization and a sud den quorum sensing synchronization. We also describe the formation of phase clusters\, where each cluster has the same frequency but is phase shifted with respect to other clusters\, giving rise to a global signal that is mor e complex than that of the individual oscillators. Finally\, we describe ex perimental and modeling studies of chimera states and their relation to oth er synchronization states in populations of coupled chemical oscillators. LAST-MODIFIED:20160519T134404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170210T200000Z DTEND:20170210T211500Z DTSTAMP:20260828T094430Z UID:p34vtgk6cn4lj117l7psev7ge4@google.com CREATED:20170106T213110Z DESCRIPTION:Speaker Name: Bertrand I. Halperin \n\nSpeaker Institution: Ha rvard\n\nTitle: Perspectives on the half-filled Landau level\n\nAbstract: T here has been a flurry of recent theoretical activity related to the proble m of a half-full Landau level\, based on a model of a system of Dirac fermi ons interacting with an emergent U(1) gauge field. This activity has produc ed a number of important insights into the physics of a partly filled Landa u level and has shed light on the relation between this problem and several other problems in condensed matter theory. However\, there has been some c onfusion in the community about the relation between this new approach and the earlier “HLR” picture based on non-relativistic fermions and a Chern-Si mons gauge field. For many years\, it has been widely believed that the HLR approach is incompatible with particle-hole symmetry\, which is known to b e present in a certain limit of the problem\, while this symmetry is built into the Dirac formulation. However\, we find that when properly evaluated \, the HLR theory actually predicts an emergent particle-hole symmetry in p hysical properties near half filling.\n\nReference: C. Wang\, N. R. Cooper \, B. I. Halperin\, and A. Stern\, Particle-hole symmetry in the Fermion-Ch ern-Simons and Dirac descriptions of a half-filled Landau level\, arXiv:170 1.0007.\n \n\nLocation: 2205 John S. Toll Physics Building\n\nHost: Jay Sau & Dong-Ling Deng\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20170217T213436Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:3 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161005T180000Z DTEND:20161005T190000Z DTSTAMP:20260828T094430Z UID:ccm32u17bbp79dfeoml5ipiq40@google.com CREATED:20160926T173530Z DESCRIPTION:Seminar will be preceded by lunch at 12:30 pm. The talk is from 2:00 to 3:00 pm. Times are tentative.\n\nSpeaker: Prof. Chris Quigg\n\nSpe aker Institution: Fermilab\n\nTitle: Looking Forward from ICHEP2016\n \nAbs tract: I will present an idiosyncratic view of where we stand following ICH EP\, mentioning developments from LHC experiments and elsewhere\, and give an assessment of what comes next. I will bring plenty of questions\, and lo ok forward to hearing yours! LAST-MODIFIED:20160929T150141Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Particle Theory-Experiment Maryland-Hopkins Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180220T160000 DTEND;TZID=America/New_York:20180220T170000 DTSTAMP:20260828T094430Z UID:3ap1vltufbqalc5vi5iqc8p6m8_R20180206T210000@google.com RECURRENCE-ID;TZID=America/New_York:20180220T160000 CREATED:20180102T192312Z DESCRIPTION:Speaker Name: John Paul Chou\n\nSpeaker Institution: Rutgers\ n\nTitle: Dark Matter in Collision at the LHC \n\nAbstract: The Large Ha dron Collider at CERN has ushered in a new era in fundamental physics\, in which images of proton-proton collisions of unprecedented quality and quant ity are recorded at the highest energies ever obtained in a lab. In 2012\, the CMS and ATLAS experiments discovered the Higgs boson\, completing the picture of the Standard Model of particle physics. Where else will this ne w era take us? Dark matter\, seen astronomically through its gravitational effects\, has a natural particle interpretation and should be observable a t the LHC. But this simple story may have unexpected twists and turns. I will discuss the different ways that dark matter and related particles coul d manifest at the LHC and what unexpected secrets may lie in store for the future. \n\nHosted by Sarah Eno LAST-MODIFIED:20180509T201649Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20170330T223000Z DTEND:20170330T233000Z DTSTAMP:20260828T094430Z UID:htqo4k47gspsr5vcp04qb9iirk@google.com CREATED:20170309T221328Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\n\nTentative schedule:\n\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Pro f. Steve FetterThe Day After Trinity\nMar 16Dr. Eric DennaThe Imitation Gam e\nMar 30Prof. James GatesThe Day The Earth Stood Still\nApr 13Prof. Juan U riagerekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill DorlandChina Syndrome LAST-MODIFIED:20170324T172138Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Movies\, Science and the World: The Day the Earth Stood Still TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171115T160000Z DTEND:20171115T170000Z DTSTAMP:20260828T094430Z UID:7kjse4fisma750dm7bkkcminrn@google.com CREATED:20171101T155730Z DESCRIPTION:Speaker: Dave Touchette\n\nAffiliation: Waterloo\n\nTitle: Prac tical Quantum Appointment Scheduling\n\nAbstract: The prospect of interacti ve quantum communication leads to stunning advantages over its classical co unterpart: some specifically crafted problems have provable exponential qua ntum advantage. However\, the underlying protocols assume perfect quantum c ommunication as well as local processing. What about more restricted models of quantum computation and communication which are closer to what is achie vable in the near future? Can we still obtain substantial quantum advantage s with such?\n \nWe propose a protocol based on coherent states and linear optics operations for solving the appointment-scheduling problem. Our main protocol leaks strictly less information about each party’s input than the optimal classical protocol\, even when considering experimental errors. Alo ng with the ability to generate constant amplitude coherent states over two modes\, this protocol requires the ability to transfer these modes back-an d-forth between the two parties multiple times with low coupling loss. The implementation requirements are thus still challenging. Along the way\, we develop new tools to study quantum information cost of interactive protocol s in the finite regime.\n \nThis is joint work with Benjamin Lovitz and Nor bert Lütkenhaus LAST-MODIFIED:20171101T155730Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20161215T200000Z DTEND:20161215T210000Z DTSTAMP:20260828T094430Z UID:7pjd4j27f8ikdkquvtsh63gbn0@google.com CREATED:20161205T192304Z DESCRIPTION:Speaker: Peizhi Du\n\nSpeaker Institution: University of Maryla nd\n\nTitle: Natural warped/composite seesaw and LHC phenomenology\n\nAbstr act: It was shown that the warped extra dimensional model with a SM singlet bulk fermion\, which is coupled to the Higgs and lepton doublet near the I R brane\, and also having a Majorana mass of the order of Planck scale on t he UV brane\, gives rise to a natural realization of neutrino mass seesaw. Despite the type I or high-scale seesaw feature suggested by such set-up\, a careful investigation of this model based on mass basis of the singlet ne utrinos reveals that the SM neutrino masses are generated dominantly by exc hange of the TeV scale Pseudo-Dirac Kaluza-Klein pairs\, which bears resemb lance to the so-called “inverse seesaw” instead. This model then creates th e possibility of probing the mechanism of neutrino mass generation at the L HC via signals for the SM singlet neutrinos. In this talk\, I will use two site (elementary and composite) model to study the phenomenology of natural warped seesaw at the LHC. We assume that the composite sector has a global SU(2)_L ×SU(2)_R ×U(1)_X symmetry\, which is well motivated by consistency of EW precision tests. Various representations of the SM singlet neutrino under SU(2)_R×U(1)_X symmetry are investigated. When the SM singlet neutrin o is charged under SU(2)_R × U(1)_X\, we discuss the production of SM singl et neutrino via decays of W_R or composite U(1)_X gauge bosons. We also con sider the case where the SM singlet neutrino is singlet under SU(2)_R × U(1 )_X\, and its dominant production is via decays of KK modes of left-handed lepton doublet. All channels have distinct features compared to 4D Left-Rig ht symmetric models. LAST-MODIFIED:20161205T192304Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Pre-Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20171031T171500Z DTEND:20171031T181500Z DTSTAMP:20260828T094430Z UID:23p0idlj373mfpp0camrm7stdj@google.com CREATED:20171024T133412Z LAST-MODIFIED:20171024T133545Z LOCATION:IPST 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170413T223000Z DTEND:20170413T233000Z DTSTAMP:20260828T094430Z UID:f8nqk71vdjg6evf3ktb3n8u60c@google.com CREATED:20170213T160611Z DESCRIPTION:Details:\nhttps://www.physics.umd.edu/hep/drew/movies2017.html\ n\n\nTentative schedule:\n\nFeb 16Prof. Drew BadenDr. Strangelove\nMar 2Pro f. Steve FetterThe Day After Trinity\nMar 16Dr. Eric DennaThe Imitation Gam e\nMar 30Prof. James GatesThe Day The Earth Stood Still\nApr 13Prof. Juan U riagerekaArrival\nApr 27Prof. Raman SundrumParticle Fever\nMay 11Prof. Bill DorlandChina Syndrome LAST-MODIFIED:20170309T192851Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Movies\, Science\, and the World: Arrival TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180406T200000Z DTEND:20180406T204000Z DTSTAMP:20260828T094430Z UID:h982a0377paga70o9fe05l4a0k@google.com CREATED:20180328T194721Z DESCRIPTION:Speaker: Aaron Ostrander\n\nAffiliation: QuICS\n\nTitle: Charac terization of Rigid Magic Binary Constraint Games on Graphs\n\nAbstract: Tw o player binary constraint games are games where Alice and Bob are asked to assign 0 and 1 to variables subject to some constraints. The magic pentagr am game and magic square game are two such games with unique quantum strate gies that win with probability 1 (while classical strategies succeed with p robability less than 1). For a class of games that generalizes the magic sq uare and pentagram\, we show that any game with a unique strategy is basica lly equivalent to either the magic square or magic pentagram. We provide a graph theoretic characterization of these games. (Joint work with Amir Kale v and Carl Miller)\n\nNote: There will be snacks and drinks at 4:00pm and t he talk is from 4:10pm to 4:40pm.\n LAST-MODIFIED:20180328T194721Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180727T193000Z DTEND:20180727T210000Z DTSTAMP:20260828T094430Z UID:6bg4mm7a864gh0766eslipipud@google.com CREATED:20180718T160317Z DESCRIPTION:Speaker Name: Tobias Grass\n\nSpeaker Institution: JQI\n\nTitle : Optimization and physics: the hardness of a problem and annealing strateg ies to solve it\n\nAbstract: Many combinatorial optimization problems pose a challenge to classical computers. Annealing algorithms which can solve su ch problems have been established by exploring the relation to statistical physics. In recent years\, annealing strategies which involve quantum fluct uations have become feasible and might provide some quantum speed-up. In th is lecture\, I will discuss these different approaches to optimization prob lems.\n\nNotes: Food and beverages served after the talk. LAST-MODIFIED:20180718T160317Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI summer school TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181119T203000Z DTEND:20181119T220000Z DTSTAMP:20260828T094430Z UID:2ucc7mss6fdbarotsmt9r70hrd@google.com CREATED:20181109T130737Z DESCRIPTION:Title : Heating of the Compact X-ray Corona in Seyfert Galaxies \nSpeaker Name: Dr. Yajie Yuan\nSpeaker Institution : Princeton University\ nNotes: Coffee and snacks available at 3 PM.\nAbstract : There is observati onal evidence that the X-ray continuum source that creates the broad fluore scent emission lines in some Seyfert Galaxies may be compact and located at a few gravitational radii above the black hole. We consider two scenarios for the X-ray emission. The first possibility is that the X-rays may be pro duced by particles accelerated in an electrostatic gap at the base of a put ative jet. However\, our detailed study of the gap kinetic physics and scal ing suggests that the energetics is not enough in these environments. The s econd possibility is that the compact X-ray emitting source may be powered by small scale flux tubes near the black hole that are attached to the orbi ting accretion disk. Our force-free simulations show that the field linking the black hole and the disk can get twisted up by the differential rotatio n to form a magnetic tower. When the confinement provided by the field from the outer disk is strong\, the built-up magnetic tower can quickly become kink unstable\, which leads to continuous reconnection and dissipates most of the energy extracted from the rotating black hole. This could in princip le power a hot X-ray emitting region above the black hole. LAST-MODIFIED:20181109T130737Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190304T200000Z DTEND:20190304T213000Z DTSTAMP:20260828T094430Z UID:41q9cqp9uh82rbc9e40kqrh26u@google.com CREATED:20190128T175819Z DESCRIPTION:

Surjeet Rajendra n\, University of California\, Berkeley
Title: Firewalls in General Rela tivity


Abstract: Abstract: We present spherically symmetr ic solutions to Einstein’s equations which are equivalent to canon- ical Sc hwarzschild and Reissner-Nordstrom black holes on the exterior\, but with s ingular (Planck- density) shells at their respective event and inner horizo ns. The locally measured mass of the shell and the singularity are much lar ger than the asymptotic ADM mass. The area of the shell is equal to that of the corresponding canonical black hole\, but the physical distance from th e shell to the singularity is a Planck length\, suggesting a natural explan ation for the scaling of the black hole entropy with area. The existence of such singular shells enables solutions to the black hole information probl em of Schwarzschild black holes and the cauchy horizon problem of Reissner- Nordstrom black holes. While we cannot rigorously address the formation of these solutions\, we suggest plausibility arguments for how ‘normal’ black hole solutions may evolve into such states. We also comment on the possibi lity of negative mass Schwarzschild solutions that could be con- structed u sing our methods. Requirements for the non-existence of negative-mass solut ions may put restrictions on the types of singularities allowed in an ultra violet theory of gravity. LAST-MODIFIED:20190215T190359Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190313T150000Z DTEND:20190313T161500Z DTSTAMP:20260828T094430Z UID:10rtl08a3or9tj8p9t2bu7vb4a@google.com CREATED:20190130T010537Z DESCRIPTION:Title: Probing Many Body Localization

Speaker: Rajdeep Sensarma (TIFR\, India)

Abstract: The phenomenon of man y body localization (MBL) in interacting strongly disordered systems have b een studied in complimentary ways in theory and experiments. Theoretical st udies have focussed on the properties of many body eigenstates\, including their entanglement properties\, while experimental tests have looked at how memories of initial states are retained in non equilibrium dynamics. In th is talk I will first discuss how distributions of entanglement spectra can be used to study the MBL to ergodic transition in disordered spin chains an d try to identify an "order parameter" for this transition. Expetimentally\ , disordered cold atom systems are initialized to Fock states with density imbalance between alternate sites and allowed to evolve. A finite long time imbalance is then taken as an indicator of MBL. Using a recent extension o f Keldysh field theory\, I will analyze these experiments and relate the lo ng time imbalance in non interacting systems to the localization length usi ng an exact analytic result. I will then present numerical results about lo ng time imbalance in interacting disordered systems.

Host: Jay Sau
Condensed Matter Theory Center website:
http://www.physics.umd.edu/cm tc/seminars.html LAST-MODIFIED:20190228T153913Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201102T210000Z DTEND:20201102T223000Z DTSTAMP:20260828T094430Z UID:1j49lgvaj9cgds8nervlrb1nbg@google.com CREATED:20200909T181310Z DESCRIPTION:Speaker:  \;Dr. Amalia Panella\, \;Gordon &\; Bet ty Moore Foundation \; \;
Title: Career Speaker Series
Dr . Panella will discuss her unexpected direction from grad school and postdo c training to working as a foundation program manager. \; \;

The Career Speaker Series is meant to give advice to junior scientist on w hat their choices are\, how life works after grad school\, what scientific careers are out there.

Zoom Link \; &\; \; \;Log In Information


https://umd.zoom.us/s/ 91198037643

Meeting ID: 911 9803 7643 \;

Password:55848 4 \;

LAST-MODIFIED:20200930T154948Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar CAREER Speaker: Amalia Panella\, Gordon & Betty Mo ore Foundation TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200928T190000Z DTEND:20200928T203000Z DTSTAMP:20260828T094430Z UID:1290toug6chmuq6qev1g8faif4@google.com CREATED:20200806T144556Z DESCRIPTION:Raffaele-Tito D'Agnolo\, Institut de Physique Théorique

Seminar to be Conducted Via Zoom

Title: A New Concept for Axion Dark Matter Detection


Abstract: I discuss a new approach to search f or axion dark matter with a superconducting radio frequency cavity. Our ide a exploits axion-induced transitions between nearly degenerate resonant mod es. Compared to traditional detection strategies\, this allows for parametr ically enhanced signal power for axions lighter than a GHz (~micro-eV). The projected sensitivity covers about two orders of magnitude in axion mass o n the QCD line. It is also sensitive to new parameter space for about fifte en orders of magnitude in mass\, down to the fuzzy dark matter limit.
For Zoom link to contact please contact mknouse@umd.edu LAST-MODIFIED:20200924T173610Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200306T180000Z DTEND:20200306T190000Z DTSTAMP:20260828T094430Z UID:4kjf42l4054vsdrao0llimd6sf@google.com CREATED:20200122T134516Z DESCRIPTION:Speaker: Xiaoyu (Rayne)Zheng\, Assistant Professor\, University of California Los Angeles\, Civil and Environmental Engineering \n\nTitle : Less is More: Design and Additive Manufacturing of Multi-Functional Archi tected Metamaterials\n\nAbstract: Material properties are governed by their chemical composition and intrinsic crystalline structures. This fundamenta lly limits material properties and their applicability creating trade-offs for selecting materials for product applications\, from structural componen ts to sensors and antennas.\n\nMetamaterials represent the concept of utili zing artificial material building blocks to create desirable properties der ived from three-dimensional layout and compositions. While novel topologies can now be realized via additive manufacturing\, the lack of processable m aterials\, multi-material gradients\, speed and scalabilities have stymied its further adoption.\n\nDr. Zheng will outline a suite of new material des ign and manufacturing routes\, enabled by additive manufacturing of topolog ies\, multi-scale features and multi-material cues. Attention is focused on how additive manufacturing techniques will enable processing the unprocess able\, from structural composites to functional and stimuli-responsive mult i-materials. This unleashes new design freedoms for rapid material property discovery and product realizations\, where mechanical\, thermo\, electrica l\, and their coupling behaviors can be inversely designed and tailored by an end user at will. Zheng will present a few examples\, where structural\, electronic and energy transduction materials are 3D architected into a com pact form factor\, without requiring multiple processing stages such as pri nting\, embedding or wiring. Next\, we will present their new applications\ , from ultralight and strong materials\, intelligent wearables\, to compact systems for robotics\, air and maritime sensing\, actuation\, wave guiding and telecommunications. LAST-MODIFIED:20200227T164901Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180926T183000Z DTEND:20180926T200000Z DTSTAMP:20260828T094430Z UID:468cb2d7dl4iceb0vd1i5n1bme@google.com CREATED:20180905T133454Z DESCRIPTION:\nTitle: Simulations of pair-producing gaps at the base of AGN jets\n\nSpeaker: Alex Chen\, Princeton University\n\nAbstract: Some active galactic nuclei (AGN)\, including non-Blazars\, show rapid gamma-ray variab ility that might originate from very close to the black hole. Particularly in low-luminosity AGNs\, it is believed that a local region with unscreened electric field could develop in the black hole magnetosphere\, acceleratin g particles and producing high energy gamma-rays that create e± pairs. We c arry out time-dependent self-consistent 1D PIC simulations of this process\ , including inverse Compton scattering and photon tracking. We find a highl y time-dependent solution where a macroscopic gap opens quasi-periodically to create e± pairs and high energy radiation. If this gap is operating at t he base of the jet in M87\, we expect an intermittency on the order of a fe w rg/c\,which coincides with the time scale of the observed TeV flares from the same object. LAST-MODIFIED:20180921T140322Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190916T190000Z DTEND:20190916T203000Z DTSTAMP:20260828T094430Z UID:1893uiq24avbnbgouddm87f09m@google.com CREATED:20190819T204612Z DESCRIPTION:Speakers: Brian Swingle and Stefano Antonini\, UMD\n\nTitle: Ho lographic Randall-Sundrum Braneworld from Black Hole Microstates\n\n Abstra ct: Certain high-energy holographic CFT states correspond to\nAdS black hol e microstates with a geometrical behind-the-horizon\nregion\, modelled by a portion of a second asymptotic region\nterminating at an end-of-the-world (ETW) brane. The ETW boundary\ngeometry takes the form of a closed FRW spac etime. Under the right\nconditions\, we might have gravity locally localize d to the ETW brane\nsimilarly to the Randall-Sundrum II scenario for cosmol ogy. In this\ncase\, the effective description of physics beyond the horizo n could be\na big bang/big crunch cosmology of the same dimensionality as t he CFT\nand the black hole microstate would give a precise\, microscopic\nd escription of this cosmological physics. We show that such a\nbraneworld sc enario can be realized in a simple bottom up model\nconsisting of a constan t tension brane coupled to Einstein-Maxwell\ntheory. We also briefly discus s prospects that this physics could be\nexplored in quantum simulators. LAST-MODIFIED:20190909T195721Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190410T150000Z DTEND:20190410T160000Z DTSTAMP:20260828T094430Z UID:6brmnlh533sa7d99thedatfkhh@google.com CREATED:20190328T130449Z LAST-MODIFIED:20190328T130513Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201211T180000Z DTEND:20201211T190000Z DTSTAMP:20260828T094430Z UID:267kq5pv3lb1qi0kdc7u155o1t@google.com CREATED:20200923T170144Z DESCRIPTION:Speaker: George Vander Voort\, Principal\, Vander Voort Consult ing\, LLC\, and Consultant at Struers\, Inc.

Title: Metallography/Ma terialography

Abstract: The lecture defines what metallography is an d describes what industries use it to study the microstructure of specimens they work with. \; It also describes what the purposes are for doing s uch studies. \; An example is presented of a metallography study of sam ples from the lower head of the Three Mile Island Unit 2 nuclear reactor af ter its failure in 1979. This shows how the temperature in different locati on that was reached due to the failure could be determined using microstruc tural examination after the failure. The lecture also describes the steps u sed to create these micrographs. Sectioning of specimens is a critical step as if it is not controlled excessive heat could be introduced into the spe cimens that would make it appear that the specimens were heated in the acci dent to a higher temperature than actually occurred. Samples are usually mo unted in polymeric compounds so that the edges can be preserved during grin ding and polishing. The etchant chosen must be the best to properly reveal the microstructure and alloy the constituents to be identified and\, if nee ded\, measured. Finally\, there are several illumination methods that can b e used with the light optical microscope to best reveal the microstructure depending upon the alloy examined.

Bio: \;

George Vander Voort\ , principal of Vander Voort Consulting LLC and consultant to Struers Inc.\, is a graduate of Drexel and Lehigh Universities. Drexel presented George w ith the Distinguished Alumnus Award in 2005 and the Service to the Professi on Award in 2016. He had 29 years’ experience in the steel industry. A past president of the International Metallographic Society and past chairman of ASTM Committee E-4 on Metallography\, George has over 447 publications\, 6 patents\, 457 lectures in 42 countries\, a video course\, and 8 ASTM stand ards. He has taught 277 seminars and courses and has received 36 awards in metallography contests. He was a trustee for ASM International and is on th e editorial boards of Praktische Metallographie/Practical Metallography\; M etallography\, Microstructure and Analysis\; Image Analysis and Stereology\ , and the International Journal of Microstructure and Materials Properties. He is a Fellow of ASTM International\, ASM International and the Internati onal Federation of Heat Treatment and Surface Engineers. George is also a F ellow and Honorary Life Member of Alpha Sigma Mu metallurgy and materials s cience honorary society and an honorary member of the Polish Society for St ereology. He was named a Distinguished Life Member of ASMI in 2020.

Z OOM: via Zoom Sherri Tatum \;statum12@umd.edu< /p> LAST-MODIFIED:20200923T170144Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190912T123000 DTEND;TZID=America/New_York:20190912T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20190912T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Strong neuron-to-body coupling implies weak neuron-to-ne uron coupling in motor cortex\nSpeaker: Woodrow Shew\nUniversity of Arkansa s | Department of Physics\n\nAbstract: Cortical neurons can be strongly or weakly coupled to the network in which they are embedded\, firing in sync w ith the majority or firing independently. Both these scenarios have potenti al computational advantages in motor cortex. Commands to the body might be more robustly conveyed by a strongly coupled population\, whereas a motor c ode with greater information capacity could be implemented by neurons that fire more independently. Which of these scenarios prevails? Here we measure neuron-to-body coupling and neuron-to-population coupling for neurons in m otor cortex of freely moving rats. We find that neurons with high and low p opulation coupling coexist\, and that population coupling was tunable by ma nipulating inhibitory signaling. Importantly\, neurons with different popul ation coupling tend to serve different functional roles. Those with strong population coupling are not involved with body movement. In contrast\, neur ons with high neuron-to-body coupling are weakly coupled to other neurons i n the cortical population. LAST-MODIFIED:20190828T153710Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191018T170000Z DTEND:20191018T180000Z DTSTAMP:20260828T094430Z UID:25m8ilk1cvtoe61i44bstrv6b0@google.com CREATED:20190905T133647Z DESCRIPTION:Speaker: Dr. Arumugam Manthiram\, Director\, Materials Science and Engineering Program\, University of Texas\n\nTitle: Electrical Energy S torage: Near-team and Long-term Perspectives\n\nAbstract: Rapid increase in global energy use and growing environmental concerns have prompted the dev elopment of clean\, sustainable\, alternative energy technologies. Renewabl e energy sources like solar and wind are a promising solution\, but electri cal energy storage (EES) is critical to efficiently utilize electricity pro duced from renewable sources as they are intermittent. EES is also the only viable near-term option for electrification of the transportation sector. Rechargeable batteries are prime candidates for EES\, but their widespread adoption for electric vehicles and grid electricity storage requires optimi zation of cost\, cycle life\, safety\, energy density\, power density\, and environmental impact\, all of which are directly linked to severe material s challenges. Lithium-ion batteries have aided the revolution in portable e lectronics for more than two decades\, but the necessity of large batteries for electric vehicles and grid storage prompts the development of next-gen eration of low-cost battery chemistries. After providing a brief account of the current status\, this presentation will focus on the development of ad vanced materials and new battery chemistries for near-term and long-term ba ttery technologies. Particularly\, the challenges and approaches of transit ioning from the current insertion-compound electrodes in lithium-ion batter ies to new conversion-reaction electrodes with multi-electron transfer to i ncrease the energy density and lower the cost will be presented. Specifical ly\, lithium-based batteries based on low-cobalt oxide and sulfur cathodes and interdigitated alloy anodes will be presented. The challenges of bulk a nd surface instability and chemical crossover during charge-discharge cycli ng\, advanced characterization methodologies to develop an in-depth underst anding\, and approaches to overcome the challenges will be presented. LAST-MODIFIED:20191016T131206Z LOCATION:Room 1116 Iribe Center\, *Clark Doctoral Distinguished Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T180000Z DTEND:20181114T230000Z DTSTAMP:20260828T094430Z UID:1scj51jecvhbbs18gdr12jnctf@google.com CREATED:20181106T181807Z DESCRIPTION:Speaker: Harry van den Akker\, School of Engineering Uni versity of Limerick and Technical University\, Delft\, The Netherlands
< br>Abstract: \;ht tp://www.burgers.umd.edu/

A poster session will display the work of graduate students and post-docs. \; \;
Reception from 5:00pm - 6:00pm following the symposium. LAST-MODIFIED:20181106T181825Z LOCATION:Rooms 1107 and 1111 Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Fifteenth Annual Symposium of the Burgers Program for Fluid Dyn amics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190424T200000Z DTEND:20190424T213000Z DTSTAMP:20260828T094430Z UID:5ag3qnn4asjur841n7trhi69i9@google.com CREATED:20190419T144451Z DESCRIPTION:Title: "Exploring Particle Acceleration in Young Pulsars with t he Dragonfly Pulsar Wind Nebula"\n\nSpeaker: Chad Brisbois\, Michigan Tech University \n\nAbstract : Seen from radio to TeV energies\, the electromagn etic radiation emitted by pulsar driven systems are numerous in our galaxy. Young pulsar systems are very bright sources at the highest energies\, wit h the Crab and Vela being the brightest objects at TeV and GeV energies\, r espectively. This emission is largely due to the powerful acceleration of e lectrons and positrons occurring near the pulsar and in its surrounding pul sar wind nebula. Understanding the effects of these systems on their surrou nding environments contributes to our understanding of the propagation of e lectrons and positrons in our galaxy. \nThe pulsar PSR J2021+3651 and its X -ray counterpart\, the Dragonfly nebula\, are associated with a TeV source\ , called 2HWC J2019+367. In X-rays\, the nebula is a few arcseconds across\ , whereas it appears much more extended at TeV energies. This is a feature also seen in other pulsar driven systems\, such as Geminga. Like the Vela a nd Crab pulsars\, PSR J2021+3651 is a relatively young pulsar which exhibit s significant γ-ray emission\, making it an ideal laboratory to test and ve rify computational models of particle acceleration. Using measurements of s ynchrotron and Inverse Compton emission in the X-ray and γ-ray range\, we c an constrain the electron spectrum across many orders of magnitude. I will present the latest results on 2HWC J2019+367 up to the highest energies usi ng data from the HAWC Observatory. LAST-MODIFIED:20190419T144502Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181112T200000Z DTEND:20181112T213000Z DTSTAMP:20260828T094430Z UID:2f7baca367dlpmbqs8q78sqivm@google.com CREATED:20181106T155827Z DESCRIPTION:Title: \;Detecting Composite Dark Matter

Speaker: Do rota Grabowska\, U.C. Berkeley

Abstract: The Dark Matter (DM) mass r egime spans over ninety orders of magnitude and while experiments have been constraining many regions of the viable parameter space\, there exist abou t thirty-five decades that have been under-explored. In particular\, for DM masses starting at around a microgram\, terrestrial detectors lack suffici ent exposure\, assuming the typical DM density\, while gravity-based detect ion methods lack sufficient sensitivity\, due to the low mass scale. In thi s talk\, I will present a viable DM candidate for this mass regime\, as wel l as detailing how current and near future precision experiments can be use d to place constraints on its interactions with the Standard Model. I will also show the sensitivity of traditional DM direct detection experiments fo r slightly lower mass composite dark matter\, where the compositeness scale plays a key role in determining the feasibility of detection for a given d etector.

LAST-MODIFIED:20181106T155827Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200304T210000Z DTEND:20200304T220000Z DTSTAMP:20260828T094430Z UID:5cknlt3vsqgaq66pkic4lu1t29@google.com CREATED:20200228T160458Z DESCRIPTION:Title : "The LZ Experiment and Supernova Neutrino Detection"\nS peaker Name: Dev Khaitan\nSpeaker Institution : University of Rochester\n\n \nAbstract : In the first 10 seconds of a core collapse supernova\, almost all of its progenitor's gravitational potential\, O(10^53 ergs)\, is carrie d away in the form of neutrinos. These neutrinos\, with O(10 MeV) kinetic e nergy\, can interact via elastic neutrino-nucleus scattering depositing O(1 keV) in detectors. Low background dark matter detectors\, such as LUX-ZEPL IN (LZ)\, optimized for detecting low energy depositions\, are capable of d etecting these neutrino interactions. A 11 solar mass supernova at 10 kpc\, will produce 50-100 neutrino interactions in the 7-tonne liquid xenon acti ve volume of LZ. We adopt a simplified neutrino flux model for a supernova\ , and use NEST and Geant4-based BACCARAT simulation engines to study energy deposition from and detection of elastic neutrino-nucleus scattering in LZ . Within the first 200 milliseconds after the onset of core collapse\, the progenitor undergoes neutronization. This produces a large flash of electro n neutrinos. During this time\, ∼10% of the total number of neutrino intera ctions are detected. We simulate the response of the LZ data acquisition sy stem (DAQ) and demonstrate its capability and limitations in handling this interaction rate. At later times\, the neutrino flux is composed of all fla vors equally. We present an overview of the LZ detector\, focusing on the b enefits of liquid xenon for supernova neutrino detection. We discuss energy deposition and detector response simulations and their results. We present an analysis technique to reconstruct the total number of neutrinos and the onset time of the electron neutrino flash. \n\n\nHosted by: Sally Megonig al LAST-MODIFIED:20200228T160458Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Colloquia/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190311T180000Z DTEND:20190311T191500Z DTSTAMP:20260828T094430Z UID:0vdlbav1370o24cvka4jhbn4j9@google.com CREATED:20190130T010309Z DESCRIPTION:Title: Symmetry and Correlation Aspects of Quantum Dynamics< /b>

Speaker: Congjun Wu (UCSD)

Abstract: Symmetry and correlation are two fundamental aspects of condensed matter studies\, and t hey also play important roles in quantum dynamics. In analogy to crystal an d the Bloch theorem which set up the symmetry foundation of condensed matte r physics\, we propose the concept of “dynamic crystal”\, which applies for a large class of systems including laser-driven solid crystals\, dynamic p hotonic crystals and optical lattices\, and generalize the Bloch theorem fo r the dynamic crystal. It includes both the static crystal and the Floquet system as special cases\, and also ex-tends to systems with intertwined spa ce-time symmetries but neither spatial nor temporal perio-dicities. A new m athematic group structure\, “space-time group”\, which augments space group with dynamic non-symmorophic symmetries of “time-screw-rotation” and “time -glide-reflection”\, are constructed to classify dynamic crystals. We also studied the real frequency re-sponses at high energies in strongly correlat ed systems\, which is a hardcore problem of con-densed matter physics. Our new progress is to employ integrable methods to theoretically inves-tigate the Bethe string states\, which are exotic many-body spin excitations\, in quantum spin dy-namics. Their dominant role in quantum spin dynamics is ide ntified when spin chains are close to the field-tuned criticality. These st ates have been observed for the first time in the electron-spin-resonance s pectroscopy measurement on SrCo2V2O8\, and we identified their appearance a s a se-ries of characteristic spectra lines.


References
1.S. L. Xu and C. Wu\, Phys. Rev. Lett. 120\, 096401 (2018) .
2. W. Yang\, J. D. Wu\, S. L. Xu\, Z. Wang\, C. Wu\, arXiv:1702.01854.
3. Z. Wang\, J. Wu\, W. Yang\, A. K. Bera\, D. Kamenskyi\, A.T.M. N. Islam\, S. Xu\, J. M. Law\, B. Lake\, C. Wu\, A. Loidl\, Nature 554\, 219 (2018).


Host : Tom Iadecola

Condensed Matter Theory Center website:
http://www.ph ysics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190228T153857Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201028T193000Z DTEND:20201028T203000Z DTSTAMP:20260828T094430Z UID:2jg4tgf8ebak7mkgof76nevpp8@google.com CREATED:20201022T202620Z DESCRIPTION:Speaker Name: Ahmed Diallo
Speaker Institution : PPPL \;
Title: Characterizing and Understanding the Instabilities Localized in the Edge of Fusion Devices: Laying the groundwork for a pedestal predictive model

Abstract: \;The simultaneous achievement of high-performa nce core plasma and highly dissipative boundary plasma is key for future fu sion reactors. The critical region of interaction is the edge transport bar rier (also known as the H-mode pedestal)\, which mediates the tension betwe en core and edge\, and plays a defining role in the performance of both. Fu sion performance in these reactors hinges critically on the efficacy of the edge transport barrier at suppressing energy losses. This talk will highli ght current state of research aimed at characterizing and understanding the instabilities localized in the edge of fusion devices as well as challenge s for the development of edge models for future devices. \; \;
< br>
Contact Marc Swisdak (swisdak@umd.e du) for the Zoom link


Host: Marc Swisdak
E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20201022T202620Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181121T160000Z DTEND:20181121T170000Z DTSTAMP:20260828T094430Z UID:575it2en96vjkodgvte0jhuq5s@google.com CREATED:20180905T135755Z LAST-MODIFIED:20181113T133726Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR - HAPPY THANKSGIVING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190430T180000Z DTEND:20190430T193000Z DTSTAMP:20260828T094430Z UID:5jlvi5ep7f7drnp31nmlt72r66@google.com CREATED:20190313T183058Z DESCRIPTION:Tanmay Vachaspati\, Arizona State University\n\nTitle: A Classi cal-Quantum Correspondence\n\nAbstract: We show that certain quantum system s in non-trivial classical \nbackgrounds can be mapped into entirely classi cal systems in \nhigher dimensions. The evolution of the classical system c an\nbe used to obtain the particle production rate as well as the \nquantum backreaction on the classical background. The technique \nhas many potenti al applications\, including breather/oscillon\ndynamics\, Hawking radiation and black hole evaporation\, and\nparticle production during inflation. LAST-MODIFIED:20190425T185755Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190411T193000Z DTEND:20190411T203000Z DTSTAMP:20260828T094430Z UID:5qiioup7uqtoak4ldapa514g19@google.com CREATED:20190410T171721Z DESCRIPTION:AOSC Seminar\nApril 11\, 2019\nA (Geo)Physicist Examines the Ke nnedy Assassination Film \n\nNicholas Nalli\nNOAA/NESDIS/STAR\nAbstract: \n\n\nOn 22 November 1963\, U.S. President John F. Kennedy was assassinated while riding in an open motorcade by a sniper in Dallas\, Texas. An about 8 second sequence of events was recorded with a 8-mm home movie camera as t he motorcade drove through Dealey Plaza. In this presentation\, simple one- dimensional dynamical models are uniquely applied to study in detail the fa tal shot. Explicit force calculations are carried out for determining the p rojectile's transfer of momentum and kinetic energy. The study utilized cla ssical mechanics and image analysis (which are foundations of atmospheric s cience and satellite remote sensing) for application in the Kennedy assassi nation case.\nhttps://www.atmos.umd.edu/seminar/semAbstract.php?event_id=27 0 LAST-MODIFIED:20190410T171859Z LOCATION:2400 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AOSC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190211T110000 DTEND;TZID=America/New_York:20190211T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190211T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Trapped-ion Applications and Quantum Operations\n\nSpeak er: Norbert Linke\, UMD\n\nAbstract: Trapped ions are an extremely versatil e quantum system\, leading the way in realizing scalable quantum computers\ , simulating an ever growing array of quantum phenomena\, and forming the n odes of local and long-distance photonic quantum networks.\nIn this talk I will present recent results from experiments at JQI on a chain of trapped Y tterbium ions with individual Raman beam addressing and individual readout [1]. This system can be configured to run any sequence of single- and two-q ubit gates\, making it in effect an arbitrarily programmable quantum comput er with all-to-all connectivity. We recently added a classical optimization layer\, creating a quantum-classical hybrid computer to demonstrate genera tive modelling. This machine learning task is expected to be one of the tec hniques most suited to take advantage of the additional resources provided by near-term quantum computers [2]. \nI will also show how this experimenta l setup can be adapted to simulate new and unusual physical systems\, such as para-particle dynamics and the Jaynes-Cummings-Hubbard model [3]. Finall y\, a new project to achieve a city-scale quantum network using single near -telecom photons generated by single Strontium ions will be presented.\n[1] NML et al.\, PNAS 114 13:3305 (2017)\n[2] D. Zhu et al.\, arXiv:1812.08862 \n[3] S. Debnath et al.\, PRL\, 073001 (2018)\n\nAFFILIATION\nJoint Quantum Institute\, University of Maryland\, College Park\, MD 20742\, USA LAST-MODIFIED:20190130T155053Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201120T140000 DTEND;TZID=America/New_York:20201120T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201120T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;Zoom Link
Speaker: Alessandro Lovato\, Argonne National Laboratory

Title : Recent progress in nuclear quantum Monte Carlo

Abstract: Over the last decades there has been tremendous progress in nuclear many-body theory \, which is aimed at understanding how nuclei emerge from the individual in teractions among protons and neutrons. Effective field theories exploit the symmetries of quantum chromo-dynamics to construct realistic nuclear poten tials and consistent electroweak currents in a systematic fashion. They are the input to “ab-initio” many-body methods that solve the many-body Schröd inger equation with controlled approximations. Among them\, quantum Monte C arlo approaches are known for their accuracy and capability to compute long -range structure and short-range dynamics of nuclear systems. I will report on recent quantum Monte Carlo progresses towards a comprehensive descripti on of the spectrum of light nuclei\, their interactions with neutrinos\, an d the nucleonic matter equation of state. A novel representation of the nuc lear many-body wave function in terms of artificial neural networks\, suita ble to extend the reach of quantum Monte Carlo to medium-mass nuclei\, will also be discussed. LAST-MODIFIED:20201116T174356Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181119T110000 DTEND;TZID=America/New_York:20181119T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181119T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Quantum Many-Body Physics of Qubits\n\nSpeaker: Leonid G lazman\, Yale\n\nAbstract: The ongoing development of superconducting qubit s has brought some basic questions of many-body physics to the research for efront\, and in some cases helped solving them. I will address two effects in quantum condensed matter highlighted by the development of a fluxonium q ubit. The first one is the so-called cosine-phi problem stemming from the s eminal paper of Brian Josephson: the predicted there phase dependence of th e dissipative current across a Josephson junction was observed in a fluxoni um\, after nearly 50 years of unsuccessful attempts by other techniques. Th e second one is the dynamics of a weakly-pinned charge density wave: we pre dict that the dynamics may be revealed in measurements of microwave reflect ion off a superinductor\, which is a key element of the fluxonium. LAST-MODIFIED:20181031T113316Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191105T160000Z DTEND:20191105T171500Z DTSTAMP:20260828T094430Z UID:7sqn7cs5g8he8knk10s0e9chlk@google.com CREATED:20190829T194649Z DESCRIPTION:Title: Generic "Unnecessary" Quantum Critical Points

Spe aker: Cenke Xu (UCSB)

Abstract: Quantum phase transitions can host m uch richer and more exotic phenomena compared with classical phase transiti ons. One of the examples is the generic "unnecessary" quantum critical poin ts. These quantum critical points can be avoided with strong enough symmetr y-allowed deformations of the Hamiltonian\, but all the deformations are ir relevant perturbations below certain threshold at the quantum critical poin ts. These quantum critical points are hence unnecessary\, but also unfine-t uned (generic). Unnecessary quantum critical points are directly related to the classification of interacting topological insulators. Motivated from t he recently discussed valley Chern insulators in Moiré systems\, we identif y unusual examples of topological insulators\, whose classification under i nteraction is very different from previously known cases. These examples gi ve us generic unnecessary quantum critical points with minimal degrees of f reedom.


Condensed Matter Theory Center website:
http://www.physics.umd.edu/cmtc/ seminars.html LAST-MODIFIED:20191024T123744Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190411T123000 DTEND;TZID=America/New_York:20190411T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190411T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Chaotic Dynamics of Driven Graphene Josephson Junctions\ nSpeaker: James Williams\nUniversity of Maryland | Department of Physics\n\ nAbstract: Josephson junctions with topological materials as weak links per vade the research of Majorana bound states. Yet these junctions exhibit man y complex phenomena\, some which are accessible due to new material and fab rication technology. A comprehensive picture is important both for elucidat ion of the physics of Majorana bound states and fundamental research into J osephson junctions. In this talk I will detail the physics of Josephson jun ctions and the chaotic behavior we observe in high-quality\, graphene-based Josephson junctions under application of RF radiation. We quantify a insta bility measured in the AC Josephson regime which is analyzed in terms of cr isis-induced intermittency. Further\, these observations cast doubt over ar guments that AC Josephson effect in the low RF drive amplitude region would offer the opportunity to observe 4-π current phase relation in topological Josephson junctions. LAST-MODIFIED:20190401T171245Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200131T180000Z DTEND:20200131T190000Z DTSTAMP:20260828T094430Z UID:05tmlp02a85pq8uqc9ja5tpmk8@google.com CREATED:20200121T165259Z DESCRIPTION:Speaker: Ruidan Zhong\, Postdoctoral Research Associate\, Princ eton University

Title: Towards Novel Quantum Materials: Design\, Syn thesis and characterizations

Abstract: Quantum materials are materia ls where the extraordinary effects of quantum mechanics give rise to exotic and often incredible properties. To understand their basic behavior if we are to enable optimization for a specific purpose\, discovering novel quant um materials is a primary task for scientists in the field of condensed mat ter physics and materials science. In this seminar\, research strategies to ward novel quantum materials in experiment will be introduced from the pers pective of chemistry\, materials science and physics. Such research process leads to fruitful results\, and two recent discovered candidates of quantu m spin liquid (QSL) will be presented as an example. The first candidate is a geometric frustrated magnet\, Na2BaCo(PO4)2\, which is structurally perfect without intrinsic disorder. Experiment al results\, including magnetization\, specific heat\, and neutron scatteri ng\, have indicated that this compound is an ideal QSL candidate. The secon d compound\, BaCo2(AsO4)2\, are believed t o be a Kitaev QSL candidate. This is the first time that Kitaev physics are proposed to be realized in 3d-transition-metal honeycomb in exper iment. Non-Kitaev interactions can be fully suppressed by low field\, yield ing nonmagnetic ground state and many other similarities with the well-stud ied Kitaev QSL a-RuCl3. LAST-MODIFIED:20200123T150956Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190204T210000Z DTEND:20190204T220000Z DTSTAMP:20260828T094430Z UID:2bdoae7ibbus9u5e3h1jv4kauq@google.com CREATED:20190118T165638Z DESCRIPTION:Title: Molecular Navigation Through Connexin Channels: First St eps\n\nSpeaker: Andrew Harris\, Rutgers University\n\nNotes: http://marylan dbiophysics.umd.edu/seminars/\n\nAbstract:\n\nConnexin proteins form wide p ores in plasma membrane and between adjacent cells. These gated pores are p ermeable to atomic ions and small molecules\, thereby mediating electrical and molecular signaling. The intercellular channels (“gap junction channels ”) permit cytosolic molecules such as IP3 and cAMP to pass between cells. T he plasma membrane channels (“hemichannels”) play autocrine/paracrine roles by releasing molecules such as glutamate and ATP into the extracellular en vironment. The molecular signaling mediated by connexin channels is of crit ical biomedical importance\, being intimately involved in development\, nor mal physiology\, and response to trauma and disease. Defects in connexin ch annels cause human pathologies.\n\nAlthough connexin channels as a class ar e permeable to a wide variety of small molecules\, channels formed by each of the 21 human connexin isoforms have strikingly different ionic and molec ular selectivities. The molecular permselectivity is not a simple function of pore width but depends on as yet uncharacterized interactions between sp ecific permeants and the pore lumen of each connexin isoform\; there is lit tle correlation among channel unitary conductance\, limiting pore diameter and/or charge selectivity. \n\nTo help elucidate the mechanisms that influe nce and define selective molecular permeation\, molecular dynamics simulati ons were applied to similar two molecules – one permeant and one not – in a connexin hemichannel. \n\nThe results highlight issues and factors that co me into play in selective molecular permeation of wide pores that are diffe rent from those that dominate permeation of atomic ions through ion-selecti ve pores. These include mechanisms of selectivity involving low-energy inte ractions\, and ‘‘permeant’’ and side-chain flexibility\, orientation and an isotropy. A key element of the energetic landscape is the entropic contribu tion due to molecules that can occupy many configurations and orientations in a non-rigid water-filled pore. Pore width influences the energetic lands capes experienced by these molecules and differences between them\, but oth er factors are strongly involved. Also\, for both the permeant and impermea nt test molecules\, the computed energetic barriers extend through most of the pore\, without significant binding (energy wells). \n\nThe results sugg est that this type of analysis may be useful in exploring the molecular bas is by which connexin channels distinguish among (potential) permeating mole cules\, and how mutations may alter the permeation process. LAST-MODIFIED:20190122T160418Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200917T200000Z DTEND:20200917T210000Z DTSTAMP:20260828T094430Z UID:1n00qje19ma72d0t4kel67je0o@google.com CREATED:20200909T151501Z DESCRIPTION:Speaker: Wei Xue\, UF

Seminar to be conducted via zoom.< br>
Title: New Physics Interpretations of the XENON1T Excess

Abst ract: The XENON1T collaboration has observed an excess in electronic recoil events below 5 keV over the known background\, which could originate from beyond-the-Standard-Model physics.

In this talk\, I will review some of the theoretical interpretations of the XENON1T excess\, including axion s\, dark photons\, and other dark matter models. In particular\, I will foc us on the solar axion\, and discuss some astrophysical constraints and inve rse Primakoff in the detection. After including the keV photon produced via inverse Primakoff in the detection\, the tension with the astrophysical co nstraints can be significantly reduced.

Recording of Seminar LAST-MODIFIED:20200918T191934Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT/Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181206T123000 DTEND;TZID=America/New_York:20181206T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181206T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Invariant measures for the stochastic Navier-Stokes equa tions for compressible flows and the problem of Turbulence\nSpeaker: Prof. Konstantina Trivisa\nUniversity of Maryland Department of Mathematics and I PST\n\nAbstract: Statistically stationary solutions to randomly forced syst ems have been of fundamental importance from both theoretical and practical points of view. From one hand the existence of invariant measures provides information on the long time dynamics of randomly forced systems and from the other\, under certain ergodicity assumptions\, it provides a link betwe en experimental observations and theoretical predictions. In this talk I’ll present results on the long-time behavior of solutions to a stochastically forced one-dimensional Navier-Stokes system\, describing the motion of a c ompressible viscous fluid. The existence of an invariant measure for the Ma rkov process generated by strong solutions will be discussed. LAST-MODIFIED:20181126T150300Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201104T183000Z DTEND:20201104T193000Z DTSTAMP:20260828T094430Z UID:25ra3e22ud47snqu03o812un8d@google.com CREATED:20200915T182209Z DESCRIPTION:**Joint UMD/ JHU Seminar**

Preceded by lunch with the speaker at 12:30 pm.


Speaker: Max im Pospelov\, University of Minnesota

Title: Neutron portal

A bstract:
New weakly coupled sectors may be coupled to the SM via secretl y a higher-dimensional operator that mixes neutrons with another light ferm ion\, a "dark neutron". If the mass of the dark neutron is close to the neu tron itself\, there can be interesting phenomenological consequences. Among those are corrections to neutron decay rate\, hydrogen atom (as opposed to proton) decay\, as well as novel astrophysical and cosmological phenomena. I review some of this interesting physics\, and derive novel limits on hyd rogen lifetime\, as well as new constraints on the neutron portal from cosm ology.

For zoom link please email m knouse@umd.edu LAST-MODIFIED:20201030T175435Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMD/JHU *Special Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201210T210000Z DTEND:20201210T220000Z DTSTAMP:20260828T094430Z UID:781asd5p7r44nve35ti1sq7ckd@google.com CREATED:20200910T195755Z DESCRIPTION:

Speaker: Katelin Schutz\, MIT

Seminar to be cond ucted via zoom.

Title: Making dark matter out of light: the cosmology of sub-MeV freeze-in

Abstract: Dark matter could be a “thermal-ish" relic of freeze-in\, where the dark matter is produced by extremely feeble interactions with Standard Model particles dominantly at low temperatures. In this talk\, I will discu ss how sub-MeV dark matter can be made through freeze-in\, accounting for a dominant channel where the dark matter gets produced by the decay of plasm ons (photons that have an in-medium mass in the primordial plasma of our Un iverse). I will also explain how the resulting non-thermal dark matter velo city distribution can impact cosmological observables.

For zoom link please email mknouse@umd.edu LAST-MODIFIED:20201207T140616Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170424T110000 DTEND;TZID=America/New_York:20170424T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170424T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Leticia Cugliandolo\n\nSpeaker Institution: Univ ersité Pierre et Marie Curie \n\nTitle: Measuring effective temperatures in a generalized Gibbs ensemble\n\nAbstract: Quantum integrable models displa y a rich landscape of non-thermal excited\nstates with exotic properties. T he most common way to probe them is by\nperforming a quantum quench\, namel y\, by letting a many-body initial state\nunitarily evolve with an integrab le Hamiltonian. At late times\, these\nsystems are locally described by a Generalized Gibbs Ensemble with as\nmany effective temperatures\, storing a memory of the initial state\, as\nconserved quantities. The direct measure ment of the macroscopic number of\neffective temperatures remains elusive. We show that they can be obtained\nfrom the measurement of dynamical correl ations in the asymptotic limit\nafter the quench if one employs a generaliz ed fluctuation-dissipation\ntheorem that we provide. Our procedure allows t o completely reconstruct\nthe stationary state of a quantum integrable syst em from state-of-art\nexperimental observations.\n\n • Measuri ng effective temperatures in a generalized Gibbs ensemble\n Laura Foi ni\, Andrea Gambassi\, Robert Konik and Leticia F. Cugliandolo\n arXi v:1610.00101\n\n • Probing non-thermal density fluctuations in the one-dimensional Bose gas\n Jacopo de Nardis\, Milosz Panfil\, La ura Foini\, Andrea Gambassi\,\nLeticia F. Cugliandolo\, and Robert Konik LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20200817T190000Z DTEND:20200817T200000Z DTSTAMP:20260828T094430Z UID:6is31mjsh2l1dh3oed5gjr7518@google.com CREATED:20200803T130232Z DESCRIPTION:Speaker: Raymond Co\, University of Michigan\n\nSeminar to be c onducted via zoom.\n\nTitle: Axion Kinetic Misalignment and (Lepto-)Axiogen esis\n\nAbstract: We propose a paradigm where QCD axion’s rotation in the p otential gives rise to the observed baryon asymmetry and the dark matter ab undance. The rotation is initiated by explicit Peccei-Quinn symmetry breaki ng present in the early Universe. With the aid of the Standard Model sphale ron processes (and optionally the neutrino Majorana mass term)\, the Peccei -Quinn charge associated with the rotation is transferred to the baryon asy mmetry. Axion dark matter is simultaneously produced from the kinetic misal ignment mechanism and/or parametric resonance. \n\nFor the zoom link to thi s talk please contact mknouse@umd.edu LAST-MODIFIED:20200806T152018Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181018T123000 DTEND;TZID=America/New_York:20181018T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181018T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Bifurcations in dynamical control systems for aerospace applications\nSpeaker: Prof. Derek Paley\nUniversity of Maryland Department of Aerospace Engineering\n\nAbstract: This talk will discuss bifurcations in several dynamical control systems that arise in aerospace engineering ap plications. First\, I will present the swimming dynamics and control of a f lexible underwater robot based on closed-loop control of an internal reacti on wheel. The feedback law stabilizes a limit cycle about the desired headi ng angle and produces forward swimming motion. Analysis of a global bifurca tion in the dynamics under feedback control reveals the set of control gain s that yields the desired limit cycle. Second\, I will discuss a nonlinear control system consisting of a single vortex in a freestream near an actuat ed cylinder that represents an airfoil under a conformal mapping. Using hea ving and/or surging of the cylinder as input stabilizes the vortex position relative to the cylinder. The closed-loop system utilizes a linear state-f eedback control law\, which gives rise to several bifurcations by varying t he control gains. Lastly\, time permitting\, I will discuss a state-space m odel for representing the lift of an airfoil at high angles of attack. A fe edback controller stabilizes a limit cycle in the angle of attack that prov ides greater (average) lift than a static pitch angle. In all three example s\, incorporating dynamical systems theory complements the state-space mod eling and control design. LAST-MODIFIED:20181004T162813Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190926T123000 DTEND;TZID=America/New_York:20190926T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20190919T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Tree-like approximations and critical network cascades\n Speaker: Sarthak Chandra\nUniversity of Maryland | Department of Physics\n\ nAbstract: Network science is a rapidly expanding field\, with a large and growing body of work on network-based dynamical processes. Most theoretical results in this area rely on the so-called "locally tree-like approximatio n" (which assumes that one can ignore small loops in a network). This is\, however\, usually an `uncontrolled' approximation\, in the sense that the m agnitudes of the error are typically unknown\, although numerical results s how that this error is often surprisingly small. In our work\, we place thi s approximation on more rigorous footing by calculating the magnitude of de viations away from tree-based theories in the context of network cascades ( i.e.\, a network dynamical process describing the spread of activity throug h a network). For this widely applicable problem\, we discuss the condition s under which tree-like approximations give good results\, and also explain the reasons for deviation from this approximation. More specifically\, we show that these deviations are negligible for networks with a large number of network links\, justifying why tree-based theories appear to work well f or most real-world networks. LAST-MODIFIED:20190913T131343Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200407T171500Z DTEND:20200407T181500Z DTSTAMP:20260828T094430Z UID:7agac0qpp1curkk85fthvs8th3@google.com CREATED:20200122T141159Z DESCRIPTION:Speaker: TBA\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200408T175027Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201202T203000Z DTEND:20201202T213000Z DTSTAMP:20260828T094430Z UID:2ojcvodf5sp38uijq90vkbsdet@google.com CREATED:20201125T153251Z DESCRIPTION:



Title : Magnetic pumping model for energizing s uperthermal particles applied to observations of the Earth's bow shock
< br>Speaker Name: Emily Lichko
Speaker Institution : University of Arizon a

Abstract : Energetic particle generation is an important component of a variety of astrophysical systems\, from seed particle generation in s hocks to the heating of the solar wind. It has been shown that magnetic pum ping is an efficient mechanism for heating thermal particles\, using the la rgest-scale magnetic fluctuations. Here we show that when magnetic pumping is extended to a spatially-varying magnetic flux tube\, magnetic trapping o f superthermal particles renders pumping an effective energization method f or particles moving faster than the speed of the waves and naturally genera tes power-law distributions. We validated the theory by spacecraft observat ions of the strong\, compressional magnetic fluctuations near the Earth’s b ow shock from the Magnetospheric Multiscale mission. Given the ubiquity of magnetic fluctuations in different astrophysical systems\, this mechanism h as the potential to be transformative to our understanding of how the most energetic particles in the universe are generated.
Lichko\, E.\, Egedal\ , J. Magnetic pumping model for energizing superthermal particles applied t o observations of the Earth's bow shock. Nat Commun 11\, 2942 (2020).
https://doi.org/10.1038/s41467-020-16660-4 \;

Your Name: Marc Swisdak
Your E-Mail: \; swisdak@umd.edu LAST-MODIFIED:20201125T181049Z LOCATION:Contact Marc Swisdak (swisdak@umd.edu) for Zoom address. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181129T123000 DTEND;TZID=America/New_York:20181129T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181129T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Confining charged particle orbits using hidden symmetry\ nSpeaker: Dr. Matt Landreman\nUniversity of Maryland IREAP\n\n\nAbstract: T oroidal magnetic fields can confine charged particles\, which can be exploi ted for basic physics studies or potentially for fusion energy. The magneti c field should lack axisymmetry (continuous rotational symmetry)\, or else a large electric current is needed inside the confinement region. However\, the magnetic field should possess two properties that could be termed ‘hid den symmetries’. The first\, integrability\, means the field lines should l ie on nested toroidal surfaces\, without regions of islands or chaos. The s econd\, called `quasi-symmetry’\, generalizes the conservation of canonical angular momentum in the presence of strong magnetic fields. This second pr operty arises because the Lagrangian for particle motion in strong magnetic fields can be expressed in terms of the strength of the field\, independen t of its direction. Magnetic fields with these properties can be found usin g optimization or using a new constructive procedure. LAST-MODIFIED:20181119T165748Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191030T150000Z DTEND:20191030T160000Z DTSTAMP:20260828T094430Z UID:0aigr92s09tnca4iqten3lk4s9@google.com CREATED:20190903T170421Z DESCRIPTION:Speaker: Tom Keyes\, Boston University\n\nTitle: Properties of Nanoscale Lipid Bilayers: Phase Transitions and Enhanced Sampling\n\nAbstra ct: The fluid/gel transition and the structure of lipid bilayers in vesicle s (1) and lipid-wrapped nanoparticles (LNP) (2)\, including the equilibrium number of lipids\, N\, are described as a function of the radius\, R\, usi ng simulation and theory. Unlike well-understood bulk lamellar bilayers\, t hese nanosystems are not in the thermodynamic limit. Finite size and surfac e effects\, and curvature\, are important\, and the layers are not equivale nt. It is shown that the presence of a core favors the ordered gel state wh ile curvature\, which disrupts the gel packing and increases with decreasin g R\, favors the fluid. Of course\, the transition also becomes weaker as R \, and N\, decrease. The differences of the layers are discussed\, includin g the order of events upon freezing and melting. Small vesicles form facete d gel structures with flat faces and low density\, fluid seams\; the inner layer melts first and the outer layer freezes first.\n\nVesicles are simula ted with the flat-histogram\, entropic statistical temperature molecular dy namics (STMD) algorithm (3)\, which samples both fluid and gel states in a single trajectory and dissects the freezing and melting events in detail\, avoiding the difficulties of simulating a phase transition with temperature as the control parameter. For LNP\, a hybrid MD/MC algorithm is introduced with MC moves of core radius\, allowing determination of as a much easier alternative to . A Landau theory of LNP is presented. LAST-MODIFIED:20191021T171714Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200217T210000Z DTEND:20200217T223000Z DTSTAMP:20260828T094430Z UID:6b15i5ct0bb0gtqau47che6te5@google.com CREATED:20200103T153155Z DESCRIPTION:Speaker: Asher Berlin\, NYU\n\nTitle: Direct Deflection of Dark Matter\n\nAbstract: Detecting light dark matter that interacts weakly with electromagnetism has recently become one of the benchmark goals of near-te rm and futuristic direct detection experiments. In this talk\, I will discu ss an alternative technique to directly detecting such particles below the GeV-scale. The approach involves distorting the local flow of dark matter w ith time-varying fields and measuring these distortions with shielded reson ant detectors\, such as LC circuits. LAST-MODIFIED:20200213T210903Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190909T110000 DTEND;TZID=America/New_York:20190909T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20190909T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Towards a large scale quantum computer using advanced fa brication technologies\n\nSpeaker: James S. Clarke\, Intel Corporation\n\n Abstract: Today’s quantum processors are limited to 10’s of entangled q uantum bits. If you believe the hype\, a commercially relevant system is just around the corner that can outperform our largest supercomputers. Th e reality\, however\, is that we are still at mile 1 of a marathon. Ther e are many unanswered fundamental questions. At Intel\, our approach is t o rely on the continued evolution of Moore’s Law to build qubit arrays with a high degree of process control.\n\n Here\, we present progress toward the realization of 300mm Si-MOS based spin qubit devices in a production e nvironment. This includes (i) isotopically purified 28Si epi substrates wit h a compelling substrate quality (ii) design of a custom qubit layout\, (ii i) integration of fin-based spin qubit devices using immersion lithography\ , moving from classical transistor structures to full spin qubits\, and (iv ) the realization of quantum dots in a nested gate design novel to a 300mm process line.\n\n In addition\, this talk will focus on two bottlenecks to moving beyond today’s few-qubit devices. The first bottleneck is in the interconnect design of the quantum circuit. Today’s qubits have personali ties. Individual control of each qubit is required. A small quantum proc essor today has multiple RF and DC wires per qubit. This is a brute force approach to wiring and will not scale to the millions of qubits needed for large applications.\n\n The second bottleneck relates to the speed of i nformation turns in quantum development. Fabrication of spin qubits in a s ilicon substrate bares similarity to conventional transistors from advanced CMOS technologies. One of the above 300mm wafers has over 10\,000 indivi dual quantum test structures. Naturally\, R&D should be accelerated by t he potential volume of statistical data. While automated electrical testin g of a CMOS transistor wafer can be completed in less than an hour at room temperature\, data collection at cryogenic temperatures is currently limite d to a small number of devices with a turnaround of hours to days. Rhetori cally speaking\, “How can we deliver an exponentially fast compute technolo gy with slow and serial characterization of quantum chips?”\n\nHost: Garnet t Bryant LAST-MODIFIED:20190916T180047Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190116T203000Z DTEND:20190116T213000Z DTSTAMP:20260828T094430Z UID:65ig045qrh7ji5hdtev6b5p37k@google.com CREATED:20190109T212120Z DESCRIPTION:Title : Role of neoclassical transport and the radial electric field in Wendelstein 7-X\n\n\nSpeaker: Novimir Pablant\, Princeton Plasma P hysics Laboratory \n\nAbstract : The role of the radial electric field in h igh performance ion-root plasmas on Wendelstein 7-X (W7-X) is examined and compared with neoclassical predictions. In stellarator plasmas the neoclass ical radial electric field (Er) is not intrinsically ambipolar\, and is ins tead strongly tied to the plasma profiles. The properties of the Er profile strongly influence neoclassical transport of heat\, particle and impuritie s.\n\nMeasurements of the core radial electric field (Er) have confirmed th at ion-root conditions (negative Er in the plasma core) have been achieved in W7-X with high density plasmas\, central ERCH heating and temperature eq uilibration (Te close to Ti). This is an important achievement as these are precisely the plasma conditions for which W7-X has been optimized. These m easured Er profiles agree well with the neoclassical ambipolar Er predicted by the code SFINCS. This good agreement provides confidence in the validit y of neoclassical calculations in high-density ion root conditions\, and en ables initial studies on the role of neoclassical transport in the optimize d high-density regime of W7-X.\n\nExperimental radial electric field profil es are inferred from the perpendicular velocity\, as measured by the XICS d iagnostic\, and available with a high time resolution of up to 10ms. These diagnostic measurements provide the detailed profile evolution of the radia l electric field in response to changes to the plasma density and heating p ower. Profile measurements of electron temperature (Te)\, ion temperature ( Ti) and electron density (ne) along with approximations for the average val ue of Zeff have been used as inputs to the SFINCS code to calculate the amb ipolar Er profile along with neoclassical ion and electron heat flux profil es (Qi\, Qe). Finally the total experimental energy input to the electrons and ions\, from ECRH heating and collisional heat transfer\, has been compa red to the neoclassical heat fluxes to provide a first estimate for the fra ction of transport that can be attributed to neoclassical processes in reac tor relevant high-density ion-root conditions. LAST-MODIFIED:20190109T212129Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190130T200000Z DTEND:20190130T213000Z DTSTAMP:20260828T094430Z UID:2pm4n0aettti960qsb1vi92ugg@google.com CREATED:20190128T155047Z DESCRIPTION:Title: The transmission of information between remote UdW detec tors Vs. causality\n\nSpeaker: Theodora Kolioni\, University of Patras \n\n Abstract: Using the quantum Brownian motion model\, we study the transmissi on of information between two separated harmonic oscillators (detectors)\, that interacting through a quantum scalar field. We calculate the exact sol utions to the open system dynamics. With these solutions are constructed th e density matrix propagator of the system. Finally\, we demonstrate that th e Markovian approximation fails in this system. LAST-MODIFIED:20190130T154803Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200214T170000Z DTEND:20200214T173000Z DTSTAMP:20260828T094430Z UID:215ve5nf4bopms8ek6q43pi60j@google.com CREATED:20200206T183059Z DESCRIPTION:Title: An Integrated Photonic Platform for Quantum Information Processing\nSpeaker: Subhojit Dutta\n\n\n(pizza and drinks served at 12pm\; talk starts at 12:10pm)\n\nAbstract: Quantum photonics provides a powerful toolbox with vast applications ranging from quantum simulation\, photonic information processing\, all optical universal quantum computation\, secure quantum internet as well as quantum enhanced sensing. Many of these applic ations require the integration of several complex optical elements and mate rial systems which pose a challenge in scalability. Integration of linear a nd non-linear photonics on a chip is essential to tackle this issue leading to more compact\, high bandwidth devices. I will address the problem of a scalable\, chip integrated\, fast single photon source\, by using atomicall y thin layers of 2D materials interfaced with plasmonic waveguides. Another important element in the quantum photonics toolbox is a quantum memory. To address the challenge of creating a chip integrated nanophotonic quantum m emory\, I will introduce a new material system realized by integrating rare earth ions with the emerging commercial platform of thin film lithium niob ate on insulator. Rare earth ions have found widespread use in classical an d quantum information processing. However\, these are traditionally doped i n bulk crystals which hinder their scalability. I will discuss an integrate d photonic interface for rare earth ions in thin film lithium niobate that preserves it's favorable optical properties. This combination of rare earth ions with the chip-scale active interface of thin film lithium niobate ope ns a plethora of opportunities for compact optoelectronic devices. An immed iate application is in the development of a nanophotonic quantum memory wit h an optical cavity coupled rare earth atomic ensemble. Another important a pplication is the development of a compact integrated telecom laser by inte rfacing Erbium (rare earth) ions with ring cavities in thin film lithium ni obate. Strong light matter interaction at the nanoscale may also render the possibility of single ion addressability which can potentially lead to an excellent spin photon interface. LAST-MODIFIED:20200206T183059Z LOCATION:ATL 2324\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161128T110000 DTEND;TZID=America/New_York:20161128T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161128T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Markus Oberthaler\, University of Heidelberg\n\nTitle: Quantum Metrology with Bose Einstein Condensates\n\nAbstract: Beating the classical precision limit is one of the key aspects of quantum metrology. T he goal is the generation and characterization of useful quantum mechanical resources which allow surpassing the classical precision limits. Since the gain in precision is intimately connected to quantum entanglement in many particle systems these investigations are also interesting from the fundame ntal point of view.\n\nIn this colloquium I will give an introduction to qu antum metrology and discuss how Bose Einstein condensates can be used to ge nerate entangled many particle states as well as explicitly using them for interferometry. I will also touch upon the recent development of using time reversal of non-linear dynamics to reach quantum enhanced precision. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201209T150000Z DTEND:20201209T160000Z DTSTAMP:20260828T094430Z UID:0sq3netm5ag2c91utsh69lt1k5@google.com CREATED:20201203T161952Z DESCRIPTION:Title : Development of ultra-fast laser-driven x-ray probes wit h high intensity for Warm Dense Matter probing

Speaker Name: Katia F alk

Speaker Institution : Helmholtz-Zentrum Dresden-Rossendorf
Abstract : Warm dense matter (WDM) is an intermediate state of matter at the
transition from a solid to an ideal plasma with characteristic
me dium-to-high temperatures (0.1−100 eV)\, solid densities and pressures
& gt\;Mbar. It is common inside the cores of large planets\, crusts of ageing
stars\, laser-matter interactions or as a transition state during capsu le
implosion in inertial confinement fusion (ICF). Under such conditions
quantum degeneracy and ion coupling are significant making the theoreti cal
description of WDM very challenging. WDM is also extremely difficult to
diagnose experimentally due to its high density and relatively lowtemperature\, thus active x-ray probes are required. Recently\, ultra-fas t
probing with x-ray sources for radiography and x-ray Thomson scatterin g is
now of a great interest\, in particular to study transport properti es of
WDM in relevance to astrophysical phenomena\, has become of a grea t
interest to the community. Laser-driven K-alpha sources have proven to be
excellent for this purpose\, in particular for high energy laser
experiments\, however due to relatively low conversion efficiency in
com parison to He-alpha and Ly-alpha sources\, their applicability is
limite d. Recent theoretical studies have shown that adding micro-scale
structu res to the laser-driven solid foils generating the x-rays can
significan tly enhance the flux of such sources. So far\, experimental
studies of t he use of these micro-structured targets have been limited. In
this talk \, recent experiments developing bright x-ray sources driven by
short-pu lse lasers will be presented and potential applications outlined.

Ho st Name: Marc Swisdak
Host E-Mail: \;swisdak@umd.edu \; \; LAST-MODIFIED:20201203T161952Z LOCATION:Please contact Marc Swisdak at swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190313T150000Z DTEND:20190313T163000Z DTSTAMP:20260828T094430Z UID:2i04nv2t3p10v46r6mpmrlr1t2@google.com CREATED:20190312T133635Z DESCRIPTION:Speaker: John Wright (MIT) \nTime: Wednesday\, March 13\, 2019 - 11:00am \nLocation: ATL 3100A \nIn the area of quantum state learning\, o ne is given a small number of "samples" of a quantum state\, and the goal i s use them to determine a feature of the state. Examples include learning the entire state ("quantum state tomography")\, determining whether it equa ls a target state ("quantum state certification")\, or estimating its von N eumann entropy. These are problems which are not only of theoretical inter est\, but are also commonly used in current-day implementation and verifica tion of quantum technologies. In this talk\, I will describe my work giving efficient algorithms for a variety of these problems\, including the first optimal algorithms for tomography and state certification. My results mak e use of a new connection between quantum state learning and longest increa sing subsequences of random words\, a famous topic in combinatorics dating back to a 1935 paper of Erdős and Szekeres. Motivated by this connection\, I will show new and optimal bounds on the length of the longest increasing subsequence of a random word.\n\nI will also discuss some recent work in q uantum complexity theory. LAST-MODIFIED:20190312T133635Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:3100A: QuICS Seminar-John Wright (MIT) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190408T203000Z DTEND:20190408T213000Z DTSTAMP:20260828T094430Z UID:6j053s887hdjefk09hvts8s2sr@google.com CREATED:20190321T193411Z DESCRIPTION:Title: Source of High-Energy Protons Responsible for Neutral Pi on Gamma-Ray Continuum from the Sun\n\nSpeaker: Nat Gopalswamy\, Solar Phys ics Laboratory\, NASA Goddard Space Flight Center\n\nAbstract: Forrest et a l. (1985) identified gamma-ray continuum emission well after the impulsive phase of a solar flare. They attributed the gamma-rays to the decay of neut ral pions based on the characteristic peak of this emission around 70 MeV. We refer to this emission as sustained gamma-ray emission (SGRE). The neutr al pions are produced due to the collision of protons accelerated in the er uption with those in the chromosphere. The origin of the energetic protons has been an unsolved problem for more than 30 years. The prevalent ideas ar e: (i) particles accelerated in the associated flare are somehow trapped in magnetic structures and diffuse slowly to the chromosphere\, and (ii) part icles accelerated at the associated shock diffuse back to the Sun. The issu e with the flare mechanism is that SGRE can last for hours after the flare has ended and one has to come up with unusual conditions in post-eruption s tructures that trap the flare particles and release slowly. While there wer e only a couple of SGRE events with hours-long duration\, the Fermi Large A rea Telescopes have revealed that SGRE events are rather common and in some cases the duration can be almost a day. In addition to being time-extended \, the SGRE events seem to be spatially extended as well\, which is not con sistent with the angular extent of flare structures. The only other source of energetic particles shock driven by the associated coronal mass ejection (CME). We know that CME-driven shocks accelerate particles for more than a day as inferred from interplanetary type II bursts and energetic storm par ticle events. We recently investigated this possibility and obtained a quan titative relation between SGRE and type II radio burst properties: the SGRE duration is very similar to the type II burst duration. Furthermore\, the longer the SGRE duration\, the smaller is the ending frequency of type II b ursts suggesting the shock travels to larger distances. These results stron gly support the shock source of >300 MeV protons and settle a long-standing issue that persisted for more than three decades.\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20190321T193411Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200220T183000Z DTEND:20200220T193000Z DTSTAMP:20260828T094430Z UID:53k3gdaj72f7il7feeji21laj1@google.com CREATED:20200129T184718Z DESCRIPTION:Cécile Caillol\, University of Wisconsin\n\nTitle : "Characteri zing the Higgs sector with tau leptons" LAST-MODIFIED:20200214T200100Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190408T200000Z DTEND:20190408T210000Z DTSTAMP:20260828T094430Z UID:3b1mnhihq06l83sg18th8fnba5@google.com CREATED:20190118T170507Z DESCRIPTION:Title: Precisely regulate ERK signaling pathway with local elec tric fields\n\nSpeaker: Quan Qing\, Arizona State University\n\nNotes: http ://marylandbiophysics.umd.edu/seminars/\n\nAbstract:\n\nOur main research i nterest is to understand how artificial electronics can interact with biolo gical systems. Live cells rely on a big network of signaling pathways that sense and respond to biochemical\, electrical and mechanical (BEM) stimuli. We want to explore if we can modulate this BEM network\, particularly with external electric field\, and investigate the mechanism at the molecular l evel. In addition\, we develop new strategies enabled by nanomaterials/nano structures for best integration of artificial electronic devices with live cells so that we can achieve higher sensitivity with better biocompatibilit y for in vitro and in vivo applications.\n\nIn this presentation I will tal k about our recent discovery of modulation of extracellular-signal-regulate d kinase (ERK) pathway using alternative current (AC) electric fields (EFs) . The amplitude\, duration\, and frequency of activation of the ERK pathway code diverse spectrum of information at cell\, tissue and organism levels to instruct cells to migrate\, proliferate\, or differentiate. Synchronized control of ERK activation would provide a powerful approach to regulate ce ll behaviors. Here we show for the first time that AC EFs in a new frequenc y range can reproducibly activate ERK activities through patterned local mi croelectrodes with single-cell resolution. Both the amplitude and frequency of ERK activation can be precisely synchronized and modulated. We pinpoint ed a new mechanism of AC EF induced highly specific phosphorylation of epid ermal growth factor (EGF) receptor (EGFR) to activate the EGFR-ERK pathway\ , which may serve as a powerful platform for control of cell behaviors with implications in wide range of biomedical applications. LAST-MODIFIED:20190329T170557Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200302T160000 DTEND;TZID=America/New_York:20200302T173000 DTSTAMP:20260828T094430Z UID:4nl6g6gbafic1n4icipv0jmr4o@google.com RECURRENCE-ID;TZID=America/New_York:20200302T150000 CREATED:20191218T214601Z DESCRIPTION:Jordy De Vries\, University of Massachusetts \n \nTitle: Neutri noless double beta decay in effective field theory\n\nAbstract: Next-genera tion neutrinoless double-beta decay (0vbb) experiments \naim to discover le pton number violation in order to shed light on the \nnature of neutrino ma sses. A non-zero signal would have profound \nimplications by demonstrating the existence of elementary Majorana \nparticles and possibly pointing tow ards a solution of matter-antimatter \nasymmetry in the universe. However\, the interpretation of the \nexperimental signal (or lack thereof) requires care as complicated \nhadronic and nuclear input is required to connect th e experimental data \nto a fundamental description of lepton-number violati on. In this talk\, I \nuse effective field theories to connect 0vbb measure ments to the \nfundamental lepton-number-violating source. In particular\, I will argue \nthat interpretation in terms of a light Majorana neutrino ma ss is more \ncomplicated than normally considered. LAST-MODIFIED:20200220T193530Z LOCATION:PSC 3140 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190314T180000Z DTEND:20190314T190000Z DTSTAMP:20260828T094430Z UID:2c3v4apr0j5dmk2t1gfe2ic16s@google.com CREATED:20190205T204131Z DESCRIPTION:Title: Electronic switching using Tunable Dirac fermion optics\ n\nSpeaker: Avik Ghosh\, UVA\nAbstract:The unconventional flow of electrons in 2D Dirac cone systems provides unique opportunities to realize nontrivi al electronic analogues of their optical counterparts. Using quantum simula tions of electron flow as well as careful junction fabrication [1] and tran sport experiments from our collaborators - we can now demonstrate the abili ty to steer electrons using the negative index Veselago effect [2]\, collim ate them at junctions using Klein tunneling [3] and rotate their transmissi on lobes to demonstrate the analogue of Malus' law for polarizer-analyzers [4]. Other examples such as antiKlein tunneling and electronic Brewster ang les still remain to be seen experimentally. In all these examples\, as well as analogous transport studies of Neel skyrmions along magnetic racetracks \, the key underlying physics is the conservation of topological charge car ried by the spins and pseudospins. These symmetry effects give us additiona l degrees of tunability that are quite unconventional for electronic switch ing. For instance\, the ability to collimate electron flow can be used to e ngineer a gate-tunable transport gap in bulk graphene [6]\, which is necess ary to beat the fundamental Boltzmann limit on electronic switching. Such a gap also helps us tune the junction resistance over 3 orders of magnitude\ , pushing it well beyond typical contact resistances\, making the output cu rrent saturate and giving us a high RF f_max power gain [6]. Extending the same physics\, a PN junction on a 3D topological insulator can help polariz e the transmitted spins and control the intrinsic charge-to-spin current co nversion through spin-momentum locking [7].\n\n[1] ACS Nano article ASAP 20 19. \n[2] Science\, vol. 353 :6307 \, pp. 1522-1525\, 2016\n[3] PNAS 2019\, in press\n[4] Physical Review B\, vol. 86 \, pp. 155412\, 2012\n[5] ACS Na no\, vol. 7 :11 \, pp. 9808-9813\, 2013\n[6] Nature Scientific Reports 7\, 9714\, 2017. \n[7] Physical Review Letters\, vol. 114 \, pp. 176801\, 2015\ nHost: I.Takeuchi LAST-MODIFIED:20190308T131911Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Avik Ghosh\, UVA TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191120T200000Z DTEND:20191120T210000Z DTSTAMP:20260828T094430Z UID:59npo6jr0coep98i2c6u035pi0@google.com CREATED:20191113T215253Z DESCRIPTION:


Exotic spin-triplet su perconductivity in nearly ferromagnetic UTe2
Speaker Name: Prof. Joh npierre Paglione
Speaker Institution : University of Maryland
Notes: Refreshments served at 2:30pm. For more information please contact Dave Bow en [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz.


Abstract : Topological superconductivity has at tracted great interest in condensed matter physics because of its potential applications in quantum computing. Spin-triplet superconductors are one pr omising class that can host the topological excitations of interest\, but e xperimental realizations are few and far between. Here we report the discov ery and properties of superconductivity in UTe2\, a material closely relate d to known ferromagnetic superconductors such as UGe2\, URhGe\, and UCoGe\, but lacking long-range magnetic order. Several experimentally measured pro perties feature telltale indications of an unconventional energy gap and a spin-triplet pairing state that is consistent with the presence of strong m agnetic fluctuations due to an incipient quantum critical point. Furthermor e\, the superconductivity in UTe2 is remarkably robust to extremely high ma gnetic fields\, showing re-entrant pairing up to at least 65 Tesla. I will review basic properties and our detailed investigations of the gap structu re\, relation to incipient magnetic order and Kondo coherence\, as well as indications of an anomalous normal state fluid that suggest many surprises await for this exotic material.








Bi ography

Johnpierre Paglione directs a research group in the Quant um Materials Center at the University of Maryland. His team has contributed to several fields of condensed matter research through both single-crystal synthesis of superconducting\, quantum-critical and topological materials\ , as well as exploration of novel phenomena. He is a leader in the field of quantum criticality and has made important contributions to the fields of heavy-fermion materials and the quasiparticle picture of correlated materia ls. Dr. Paglione has more recently pursued several new areas of research in cluding iron-based high-temperature superconductivity and topological insul ators and superconductors. He is the recipient of a National Postdoctoral F ellowship Award from the Natural Sciences and Engineering Council of Canada \, a National Science Foundation CAREER Award and an Early Career Award fro m the Department of Energy\, and has been selected for an EPiQS Materials S ynthesis Investigator Award by the Gordon &\; Betty Moore Foundation. Dr . Paglione earned his Ph.D. from the University of Toronto in Canada.

*NEW POLICY: All Visitors to LPS mu st present a photo ID for entry to the colloquium*< /span>


Note: LPS is located at 8050 Greenmead Drive i n College Park. There is parking at LPS and overflow parking at the adjacen t LTS building but not at the 4H building. LPS is on the UMCP shuttle route \; take #105 for the Courtyard Apts. Please use the phone on the left hand side of the front door to call the receptionist for entry.

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LAST-MODIFIED:20191113T215716Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190425T180000Z DTEND:20190425T193000Z DTSTAMP:20260828T094430Z UID:4tuo3kkgqnjnarfa2p7ltfvaua@google.com CREATED:20190412T131422Z DESCRIPTION:Latham Boyle\, Perimeter Institute\n\nTitle: CPT-Symmetric Univ erse\n\nAbstract: I will introduce our recent proposal that the state of t he universe does *not* spontaneously violate CPT. Instead\, the universe a fter the big bang is the CPT image of the universe before it\, both classic ally and quantum mechanically. The pre- and post-bang epochs comprise a un iverse/anti-universe pair\, emerging from nothing directly into a hot\, rad iation-dominated era. CPT symmetry selects the QFT vacuum state on such a spacetime\, providing a new interpretation of the cosmological baryon asymm etry\, as well as an economical explanation for the cosmological dark matte r. Requiring only the standard three-generation model of particle physics ( with right-handed neutrinos)\, a Z_2 symmetry suffices to render one of the right-handed neutrinos stable. We calculate its abundance from first princ iples: matching the observed dark matter density requires its mass to be 4. 8 x 10^{8} GeV. Several other testable predictions follow: (i) the three l ight neutrinos are Majorana and allow neutrinoless double beta decay\; (ii) the lightest neutrino is massless\; and (iii) there are no primordial long -wavelength gravitational waves. The proposal also has interesting things to say about the strong CP problem and the observed electrodynamic arrow of time. LAST-MODIFIED:20190419T130357Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Joint Gravity/ Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190226T190000Z DTEND:20190226T201500Z DTSTAMP:20260828T094430Z UID:1oq4plfgv6lletgibgmgtjb2lg@google.com CREATED:20190130T005501Z DESCRIPTION:Title: Effective quantum transport simulations with Kwant

Speaker: Joseph Weston (TU Delft)

Abstract: Kwant is a free software library that makes quantum transport
simulations simple. In th is tutorial I will give an overview of Kwant's capabilities\, as well as pr actical tips for using Kwant effectively and combining it with other numeri cal tools. In addition we will take a look at the underlying formalism and numerical implementation used by Kwant\, in order to better avoid pitfalls in interpreting results.

Host: Jay Sau

Condensed Matter Theor y Center website:
http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190205T212720Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181128T153000Z DTEND:20181128T163000Z DTSTAMP:20260828T094430Z UID:59mjbn86nchl20p45eecpjm1gq@google.com CREATED:20181120T135859Z DESCRIPTION:Speaker: David J. Wales\, Cambridge University\, Department of Chemistry

Title: Exploring Energy Landscapes: From Molecul es to Nanodevices

Abstract: The potential energy landscape provi des a conceptual and computational framework for investigating structure\, dynamics and thermodynamics in atomic and molecular science. This talk wil l summarize new approaches for global optimization\, quantum dynamics\, the thermodynamic properties of systems exhibiting broken ergodicity\, and rar e event dynamics. Applications will be presented that range from predictio n and analysis of high-resolution spectra\, to coarse-grained models and de sign principles for self-assembly of mesoscopic structures. LAST-MODIFIED:20181120T135922Z LOCATION:Portrait Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Division Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201207T110000 DTEND;TZID=America/New_York:20201207T113000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201207T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Coherence and decoherence in the Harper-Hofstadte r model

Speaker: Qi-Yu Liang\, JQI Postdocs

Abstract: \; Understanding how and when closed quantum systems \;lose \;or retai n coherence is a central intellectual and practical question in quantum sci ence. In rare cases\, such as collisional narrowing or environment assisted tunneling\, random processes can enhance coherence \;processes. In&nbs p\;this \;talk\, I will present a new addition to this list—the quasi-p eriodic lattice described by the Harper-Hofstadter (HH) model in a highly-e longated tube geometry\, by showing that the dynamics can be immune to envi ronmental noise. The interference of paths encircling the tube evokes an Ah aronov-Bohm interferometer\, which would be sensitive to a longitudinal flu x threading the long axis of the tube. Surprisingly\, by experimentally rea lizing the HH model using an atomic Bose-Einstein condensate\, we find that our HH-interferometer depends on longitudinal flux only when the transvers e flux is a rational fraction of the flux-quantum. Furthermore\, at these r ational values of transverse flux\, the time evolution averaged over all po ssible values of the longitudinal flux returns to that at nearby irrational fluxes. Thus\, the appealing intuitive picture of an Aharonov-Bohm interfe rometer is insufficient. Instead\, I will explain our observations by trans forming the HH model into a collection of momentum-space Aubry-André models .

We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetin gs. JQI members and affiliates will receive a Zoom link in an email announc ing each seminar. For those without access to Zoom\, we will also be live s treaming each seminar on YouTube. Once a seminar starts\, you will find a l ink to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews&nbs p\;(link \;is external) LAST-MODIFIED:20201118T005255Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200921T150000Z DTEND:20200921T160000Z DTSTAMP:20260828T094430Z UID:6et6qfe9sia3chu44tg41rcloq@google.com CREATED:20200917T000254Z DESCRIPTION:Title: Signatures of propagating Majorana modes measured by sca nning tunneling spectroscopy

Vidya Madhavan\, University of Illinois \, Urbana-Champaign

Absract: Topological superconductors represent a fundamentally new phase of matter. Similar to topological insulators\, the non-trivial topological characteristics of a topological superconductor di ctate the presence of a topological edge states composed of Bogoliubov quas iparticles which live inside and span the superconducting gap. The intense interest in these materials stems from the fact that Bogoliubov excitations inside the gap of a topological superconductor are predicted to have all t he characteristics of Majorana Fermions. This talk will describe recent dev elopments in two classes of topologically non-trivial superconductors: bulk topological superconductors\, and proximitized topological insulators wher e an effective time-reversal invariant generalization of p+ip superconducti vity can be realized. I will show low temperature scanning tunneling micros copy measurements on two materials that are representative of these two cla sses: FeSexTe1x which is thought to be an example of an intrinsic proximiti zed topological insulator and UTe2\, which may be a bulk topological superc onductor. I will show and discuss the signatures of Majorana bound states a s well as chiral dispersing Majorana modes in these systems.


We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI memb ers and affiliates will receive a Zoom link in an email announcing each sem inar. For those without access to Zoom\, we will also be live streaming eac h seminar on YouTube. Once a seminar starts\, you will find a link to the l ive stream on our YouTube page at https://www.youtube.com/user/JQInews(link is external). LAST-MODIFIED:20200917T000600Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200225T160000 DTEND;TZID=America/New_York:20200225T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200225T160000 CREATED:20190530T191015Z DESCRIPTION:Speaker: \; Dmitri A. Uzdensky\, \; University o f Colorado Boulder

Title:< /span> \; “Extreme Plasma Astrophysics: a New Frontier”

< p>

Abstract: \; Bright\, rapid high-energy flares an d other spectacular phenomena are powered by collective plasma processes ne ar neutron stars (NSs) and black holes (BHs)\, including in multi-messenger sources like gravitational-wave-emitting NS mergers and PeV-neutrino-produ cing blazars. While our understanding of these processes has been informed by traditional (e.g.\, space or fusion) plasma research\, the physical cond itions in plasmas around BHs and NSs are so extreme that traditional intuit ion often fails and a richer physical framework is required. Extreme astrop hysical plasmas are relativistic\, interact with radiation\, and may be sub ject to QED pair-production effects. Studying collective plasma processes w ith these “exotic” effects constitutes the realm of Extreme Plasma Astrophysics. Rapid progress in exploring this new frontier is now being made thanks to concerted\, vigorous theoretical effo rts and computational breakthroughs due to the advent of novel first-princi ples relativistic kinetic plasma codes incorporating radiation and QED pair creation. \;Laser plasma experiments may soon also contri bute to this revolution. I will describe these exciting developments\, illu strating them with our recent kinetic studies of relativistic magnetic reco nnection in NS magnetospheres and accreting BH coronae with radiation and p air-creation effects\, and of radiative relativistic turbulence. I will end by outlining the future prospects of this vibrant Extreme Plasma Astrophys ics research program. \;

LAST-MODIFIED:20200211T144958Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201210T190000Z DTEND:20201210T203000Z DTSTAMP:20260828T094430Z UID:3v73tf0jdhncuvbhrsij771u71@google.com CREATED:20200909T164039Z DESCRIPTION:Speaker:James Analytis \;\,UC Berkeley
Title: Freezing of char ge degrees of freedom across a critical point in CeCoIn5

The presenc e of a quantum critical point separating two distinct zero-temperature phas es is thought to underlie the strange metal state of many high-temperature superconductors. The nature of this quantum critical point\, as well as a d escription of the resulting strange metal\, are central open problems in co ndensed matter physics. In large part\, controversy stems from the lack of a clear broken symmetry to characterize the critical phase transition\, and this challenge is no clearer than in the example of the unconventional sup erconductor CeCoIn5. By direct Hall effect and Fermi surface measurements\, in comparison to ab initio calculations\, we observe a critical point that connects two Fermi surfaces with different volumes without a finite-temper ature symmetry breaking phase transition. Rather\, the transition involves an abrupt localization of one sector of the charge degrees of freedom. At l ow fields and temperatures\, this transition causes a divergence in the Hal l coefficient that is cut off on diluting either particles or holes. This r emarkable behavior is unexpected in the conventional picture of metals\, bu t does appear to be a non-trivial prediction of the theory of the fractiona lized Fermi liquid. In this framework\, the separation of spin and charge l eads to a critical point connecting Fermi surfaces with different volumes.& nbsp\; \;

Link: \;https://umd.zoom.us/j/91251230757?pwd=MkhFREJrUXNTekVZTTRGQ244M1VBZz09
Meeting ID: \;912 5123 0757
Password: \;& nbsp\; 558484 \; \; LAST-MODIFIED:20201204T172703Z LOCATION:zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: James Analytis \,UC Berkeley TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190312T160000 DTEND;TZID=America/New_York:20190312T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190312T160000 CREATED:20180727T143919Z DESCRIPTION:\nWeber Memorial Garden Dedication at 3:00pm outside of Physica l Sciences Complex.\nTalk to follow at 4:00pm in 1412 John S. Toll Physics Building\n\nSpeaker: Rainer Weiss\, MIT\, on behalf of the LIGO Scientific Collaboration\n\nTitle: What Joe Weber started: Gravitational wave astrono my\n\nAbstract: The talk begins with some history of the new field followed by a brief description of the technology that was required to succeed. A s ummary of the discoveries and a view to the future will end the talk. LAST-MODIFIED:20190530T190803Z LOCATION:John S. Toll Physics Building\, 4150 Campus Dr\, College Park\, MD 20740\, USA SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201130T210000Z DTEND:20201130T223000Z DTSTAMP:20260828T094430Z UID:1epoedsaha3pcsgnh5urh6uuhl@google.com CREATED:20200909T182909Z DESCRIPTION:Speaker 1: Ray Mencia\, UMD

Advisor: \;Manucharyan&n bsp\; \;

Title: Ultrahigh-impedance Josephson circuits for quantu m computing\, simulations\, and metrology

Abstract: Chains of Joseph son junctions have probably the largest kinetic per-unit-length inductance\ , which can exceed the geometric one by about 10^4\, primarily limited by q uantum phase-slip fluctuations. However\, the total inductance is also limi ted by the stray capacitance\, which grows linearly with the chain length. This stray capacitance is unnecessarily large in most circuits because of t he high dielectric constant of silicon or sapphire substrates. By releasing Josephson chains off the substrate\, we can combine the maximal per-unit-l ength inductance with the minimal stray capacitance\, thereby obtaining the highest impedance electromagnetic structures available today. As a first d emonstration\, we created a superconducting quasicharge qubit (blochnium)\, a dual of transmon\, made of a weak junction shunted by such a large induc tance (hyperinductance) that its impedance reaches over 30 × RQ (200 kOhms) . In the second demonstration\, we fabricated suspended "telegraph" transmi ssion lines\, composed of 5\,000+ junctions\, whose wave impedance exceeds 5 × RQ (32.5 kOhm). These lines are a unique resource in exploring DC curre nt metrology via Bloch oscillations\, as well as in analog quantum simulati ons of many strongly-correlated 1D systems.

Speaker 2: \;Calvin He

Title: \; Relativistic Thomson Scattering as a Potential Inten sity Gauge for Petawatt Class Lasers

Abstract: \; \;

As new high peak-power pulsed lasers systems are being built around the world \, where the most powerful lasers reach above 1 petawatt (PW)\, new opportu nities to explore physics arise along with challenges to measure the intens e beams. \; The technology to measure the pulsed beam\, however\, rely on indirect methods that may not accurately represent the full powered beam at the focus. \; In this talk\, we explore the possibility of a method to directly characterize the laser’s peak intensity at the focus\, name by measuring radiation from electrons scattered at the laser focus\, also kno wn as Relativistic Thomson Scattering (RTS). \; We present a proof-of-p rincipal study where the onset wavelength of the Doppler-shifted second har monic of RTS provides a means to estimate intensities between 1018 W/cm2 an d 1019 W/cm2. \; We also comment on measurements of the angular distrib ution of RTS and its potential as a laser intensity gauge.



< br>
Zoom Link \; &\; \; \;Log In Information

Meeting ID: 911 9803 76 43 \;

Password: 558484 \;

 LAST-MODIFIED:20201125T141749Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Ray Mencia\, UMD & Calvin He\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181129T193000Z DTEND:20181129T210000Z DTSTAMP:20260828T094430Z UID:7lqo1bifbv9i0mc08tfu9565o0@google.com CREATED:20181106T162650Z DESCRIPTION:

Title: The Gravitational S-matrix and Precision Predictions for Binary Inspirals

Speaker: Ira Rothstein\, Carnegie Melon University

Abstract: I will discuss how scattering amplitude techniques can be used to match to an Effective Field Theory of GR coupled to sources for the purpos es of calculating precision gravitational wave templates. LAST-MODIFIED:20181106T162650Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201016T170000Z DTEND:20201016T180000Z DTSTAMP:20260828T094430Z UID:3ronnh0qhpo6292atrdgk4hsq3@google.com CREATED:20200923T164944Z DESCRIPTION:Speaker: Parag Banerjee\, MSE Associate Professor\, University of Central Florida\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200930T160108Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181204T160000 DTEND;TZID=America/New_York:20181204T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181204T160000 CREATED:20180727T143919Z DESCRIPTION:\nTitle: Completing our picture of the neutrino\nSpeaker: Josh Spitz\, University of Michigan\n\nAbstract: Nearly 90 years after its prop osed existence\, the neutrino remains\nlargely mysterious and elusive. We d on't know if matter neutrinos\nbehave differently than antimatter neutrinos \, we don't know which of\nthe neutrinos is heaviest\, and we don't know ho w many types of\nneutrinos there are.\n\nThe MiniBooNE short-baseline neutr ino experiment has recently reported\na significant (4.5sigma) excess of el ectron-neutrino-like events in an\noriginally muon-neutrino beam. An oscill ation interpretation of this\ndata would require at least four neutrino typ es and indicate new\nphysics beyond the three neutrino paradigm. MiniBooNE is not alone in\nits anomalous observations of possible new neutrino mixing \, as there\nmay be hints from other experiments as well. This talk will pr esent\nthe recent MiniBooNE result and prospects for future accelerator-bas ed\nmeasurements. In particular\, Fermilab's Short-Baseline Neutrino (SBN)\ nand the J-PARC Sterile Neutrino Search at the J-PARC Spallation\nNeutron S ource (JSNS2) experiments will directly address these\nanomalies in the nex t few years.\n\nAlong with presenting the recent MiniBooNE results and intr oducing SBN\nand JSNS2\, I will touch on the first measurement of the 236 M eV kaon\ndecay-at-rest neutrino\, recently performed with MiniBooNE. The\ns ignificance of this and future studies\, in terms of elucidating both\nthe neutrino-nucleus interaction and oscillations\, will be emphasized. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190514T180000Z DTEND:20190514T191500Z DTSTAMP:20260828T094430Z UID:24k3qle5dslj2uis54fi1uf9gc@google.com CREATED:20190403T121524Z DESCRIPTION:Title: Economic inequality from a statistical physics point of view

Speaker: Victor Yakovenko (Maryland)

Abstr act: Inequality is an important and seemingly inevitable aspect of the huma n society. Various manifestations of inequality can be derived from the co ncept of entropy in statistical physics. In a stylized model of monetary e conomy\, with a constrained money supply implicitly reflecting constrained resources\, the probability distribution of money among the agents converge s to the exponential Boltzmann-Gibbs law due to entropy maximization. Our empirical data analysis shows that income distributions in the USA\, Europe an Union\, and other countries exhibit a well-defined two-class structure. The majority of the population (about 97%) belongs to the lower class char acterized by the exponential ("thermal") distribution\, which we recently u ncovered in the data for 67 countries around the world. In contrast\, the upper class (about 3% of the population) is characterized by the Pareto pow er-law ("superthermal") distribution\, and its share of the total income ex pands and contracts dramatically during booms and busts in financial market s. Globally\, energy consumption (and CO2 emissions) per capita around the world shows decreasing inequality in the last 30 years and convergence tow ard the exponential probability distribution\, as expected from the maximal entropy principle. All papers are available at http://physics.umd.edu/~ya kovenk/econophysics/.

Condensed Matter Theory Center website:
http:/ /www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190403T121524Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190213T200000Z DTEND:20190213T213000Z DTSTAMP:20260828T094430Z UID:3k65kik916s01fq5aq0fjie949@google.com CREATED:20190129T141653Z DESCRIPTION:Serguei V. Ketov\, Tokyo Metropolitan University and Kavli IPMU \, Japan\n\nTitle: Starobinsky inflation\, dark energy\, and dark matter in supergravity\n\nAbstract: The Dark Side of the Universe is considered from the viewpoint of its possible gravitational origin in the early Universe. The gravitational description of cosmological inflation is provided by Sta robinsky model. It is further extended to supergravity\, in a search for th e gravitational origin of dark energy and dark matter. This presentation is accessible to graduate students in physics\, and no prior knowledge of sup ergravity is required. LAST-MODIFIED:20190129T153606Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201119T140000 DTEND;TZID=America/New_York:20201119T153000 DTSTAMP:20260828T094430Z UID:0v3o9l3m02p54p8ni8vfr55ikb@google.com RECURRENCE-ID;TZID=America/New_York:20201119T140000 CREATED:20200901T143302Z DESCRIPTION:Speaker: N. Peter Armitage\, John Hopkins University


Title: Recent results on the electrodynamics of topological semimetals:  \; Mn3 Sn\, Cd3As2\, Pr2Ir2O7 \;and beyond… \; \;

Abstract: \;
One of the remarkable and continuing themes in physics is that concepts and mathem atical structures are repeated in different contexts across vastly differen t length scales.  \; \;Almost 90 years ago the Dirac and Weyl equat ions were proposed in the first successful reconciliation of special relati vity and quantum mechanics.  \;In condensed matter physics\, where one is interested in energy scales much smaller than the rest mass of the elect ron\, it would appear that a nonrelativistic description\, perhaps with min or corrections\, would suffice and that Dirac physics would not play an imp ortant role.  \;It is therefore remarkable that in recent years a numbe r of actual real materials exist in which the propagation of even slow elec trons through the periodic potential of a crystal leads to a an effective l ow-energy description that can resemble the Dirac and Weyl equations.   \; \;In this talk I will review our recent work using on the electrodyn amic response of these topological semimetals.  \; I will discuss magne tic Weyl systems\, Dirac semimetals\, “massive” Dirac systems and systems t hat even go beyond that possible in free space in the form of a Luttinger s emimetal e.g. a quadratic band touching.  \;These systems show a number of fascinating electronic and electromagnetic properties including zero en ergy Landau levels\, the chiral anomaly\, anomalous coupling of cyclotron m otion to phonons that renders the phonons circularly polarized\, and in the case of the quadratic band touchings -- strong interactions. \; \;  \; \;
Host: Paglione/ Greene

For the zoom link please em ail Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20201112T190807Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: N. Peter Armitage\, John Hopkins University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200914T190000Z DTEND:20200914T200000Z DTSTAMP:20260828T094430Z UID:4p6nff5lm1oo9nso3m5v1jvvea@google.com CREATED:20200821T175118Z DESCRIPTION:Seminar to be conducted via Zoom.

Speaker: Majid Ekhtera chian\, UMD

Title: Cosmological Phase Transition of Composite Higgs Confinement

Abstract: I will discuss the (cosmology of) confinement- deconfinement phase transition (PT) of nearly conformal\, strongly coupled large N field theories\, applicable to composite Higgs models. We will firs t see that despite strong coupling\, aspects of the PT can be analyzed when the confinement is predominantly spontaneous. In this scenario\, the leadi ng contribution to the transition rate can be computed within effective fie ld theory of dilaton- the pseudo Nambu-Goldstone boson associated with the spontaneous breaking of conformal symmetry. I will then show how the hologr aphic dual formulation\, with the PT being between AdS-Schwarzschild \; and Randall -Sundrum-I phases\, allows for qualitative understanding of the missing pieces of the earlier described 4D picture and a quantitative impr ovement of the calculations.We will see that cosmological PT in the minimal models can complete only after a large period of supercooling\, potentiall y resulting in excessive dilution of primordial matter abundances. I will t hen show how generic modifications of the minimal models can result in a mu ch faster completion of the PT. Finally\, I will discuss the gravitational wave signature produced by the PT and the implications of the PT for baryog enesis.

For the zoom link to this talk please contact mknouse@umd.edu LAST-MODIFIED:20200909T130830Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181127T181500Z DTEND:20181127T191500Z DTSTAMP:20260828T094430Z UID:2r4ra066t0vb5qgigc068pfol8@google.com CREATED:20180905T133248Z DESCRIPTION:Speaker: John Biddle\, Harvard University

Titl e: Cooperativity Through Conformational Ensembles: At Equilibrium and Beyon d

Abstract: Many receptor proteins show functional cooperativity in their binding of ligands even though the structure of the protein rules out any direct ligand-ligand interactions. One mechanism for this\, first proposed in the mid-1960s and named “allostery”\, proposed that some recept ors can exist in a variety of different conformations with different bindin g properties. Since that time\, the question of what patterns of effective cooperativity in binding could arise from a conformational ensemble has re mained open. We show that for systems at equilibrium\, any pattern of bin ding cooperativity that is consistent with thermodynamic equilibrium can be achieved by means of a conformational ensemble\, without any direct cooper ativity among the ligands.

In living systems\, however\, many allost eric proteins are not operating in an equilibrium environment. Enzyme-cata lyzed reactions\, in particular\, typically take place in the context of a chemical imbalance between substrate and product. The number of substrate- binding sites that an enzyme possesses places a limit on the sharpness of i ts binding curve at equilibrium irrespective of its conformational properti es\, but a living organism can exceed this limit by making use of both mult iple conformations and the difference in chemical potential between substra te and product. This finding sheds light of the function of conformational ensembles in living organisms. LAST-MODIFIED:20181115T132201Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Semimar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200917T120000Z DTEND:20200917T130000Z DTSTAMP:20260828T094430Z UID:4jc0eo3add4rq9329slv2fejkb@google.com CREATED:20200916T140325Z DESCRIPTION:Sankar Das Sarma has written a long-awaited addition to his blog on the CMTC website< /a> on the topic of the ongoing covid-19 pandemic. Moving forward\, Das Sar ma will use these essays to focus \;on major topics in the public disco urse \;surrounding \;the pandemic\, this post focuses on the possib ility of a covid-19 vaccine being created and released to the public anywhe re in the near future. https://www.physics.umd.edu/cmtc/blog.html LAST-MODIFIED:20200916T140353Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:New CMTC Blog Post on COVID-19 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200205T160000Z DTEND:20200205T170000Z DTSTAMP:20260828T094430Z UID:6arvrlqb5mc3aonfeev6q862t1@google.com CREATED:20200122T141705Z DESCRIPTION:Speaker: Mark Maroncelli\, Penn State\n\nTitle: Ionic Liquids\, Physical Properties and Media for Chemical Reaction\n\nAbstract: Ionic liq uids\, ionic compounds having melting points below 100 C\, are a relativel y new class of liquids\, which are finding use in a wide range of chemical applications. Our research has focused on understanding the fundamental ph ysical properties of ionic liquids as they relate to use of these materials as reaction media and electrolytes. In this talk\, I will provide an over view of our work in this field and also discuss our latest results on an io nic liquid that appears to solidify into a new type of solid phase. LAST-MODIFIED:20200203T135437Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191024T180000Z DTEND:20191024T190000Z DTSTAMP:20260828T094430Z UID:63q0jmngihm7grh9hos2tjeihu@google.com CREATED:20191016T145519Z DESCRIPTION:Title: Functional Magnetic Materials for Emerging Spintronics a nd\nMEMS devices\nSpeaker: Xinjun Wang\, NIST\nAbstract: \nFunctional magne tic materials whose properties can be modified with external electric field s are\nof great interest for mobile platforms such as aircraft\, satellites \, unmanned aerial vehicles\, etc\,\nowing to their potential for extremely high densities\, low power consumption\, and fast operation\nspeed. One cl ass of such functional materials has been broadly explored in so-called mul tiferroic\ncomposites\, in which a ferroelectric component generates stress es in response to a modest\nelectric field to strain a magnetostrictive fer romagnetic component. I will highlight three specific\nmultiferroic composi te applications explored during my thesis work\, including the voltage\ncon trol of ferromagnetic resonance\; voltage control of interlayer exchange co upling\; and voltage\ntunable RF MEMS inductor. The last is a device that s hows a maximum tunability of 191% with\na flat inductance within the operat ing frequency which greatly improves the integration level and\nperformance of tunable radio frequency integrated circuits while reducing their power\ nconsumption and cost.\nI will also highlight emerging results from my curr ent post-doctoral associateship at the National\nInstitute of Standards and Technology\, where I am focused on the design and measurement of\nperpendi cular bulk synthetic antiferromagnetic composites\, based on L1 0 FePd allo ys\, for next-\ngeneration magnetic random access memory technologies.\n\nH ost: Ichiro Takeuchi \n\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20191016T200225Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Xinjun Wang\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190306T200000Z DTEND:20190306T213000Z DTSTAMP:20260828T094430Z UID:4g0c421gm162v1lghp2hshbr9p@google.com CREATED:20190129T150158Z DESCRIPTION:Gabor Sarosi\, University of Pennsylvania\n\nTitle: Dual of the bulk symplectic form and the volume of maximal slices in AdS/CFT\n\nAbstra ct: I will explain how to understand the symplectic structure of the gravit ational phase space in AdS in terms of the quantum overlap in the holograph ically dual CFT. As an application\, I will use this to study the boundary description of the volume of maximal Cauchy slices. I will construct the bo undary deformation that is conjugate to the volume in empty AdS\, and the t hermofield double at infinite time. I will explain the bulk interpretation of this deformation and speculate on its boundary interpretation. This will motivate a concrete version of the complexity equals volume conjecture\, w here the boundary complexity is defined as the energy of geodesics in the K ahler geometry of path integral states. LAST-MODIFIED:20190221T185854Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190405T160000Z DTEND:20190405T164000Z DTSTAMP:20260828T094430Z UID:3blpsgfl5ifcjg3m45q1ioqnii@google.com CREATED:20190401T163501Z DESCRIPTION:Title: Quantum Optics and Four-Wave Mixing in Rubidium Vapor Ce lls\n\nSpeaker: Nick Brewer\, JQI\n\nAbstract: First there will be a discus sion of quantum optics and the photon picture of light. Next\, I will descr ibe our four-wave mixing experiments in rubidium vapor cells and how we gen erate quantum light in the lab. The four-wave mixing process generates “twi n beams” that exhibit squeezing and therefore entanglement that can be used for applications such as quantum communication and quantum imaging. Using a new technique\, we recently demonstrated low frequency squeezing (< 10 Hz ) which should make quantum imaging experiments feasible.\n\nNotes: Lunch s erved at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190401T163501Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190325T203000Z DTEND:20190325T213000Z DTSTAMP:20260828T094430Z UID:3id4o81a8b31oa3e57f7d3bpnr@google.com CREATED:20190302T180752Z DESCRIPTION:Title: Technosignatures - NASA's search for intelligent life

Speaker: Louis Barbier\, NASA HQ

Abstract: In October 2017 a strange object \;was detected in our solar system . An object of unknown origin and type flying past the sun at 196\,000 mph\ , on a hyperbolic trajectory from outside our solar system. What was this s trange object? Was it merely a comet? An asteroid? A spaceship? That is sti ll being debated. Oumuamua aside\, NASA is searching for signs of alien technology \;in the universe . The 2018 NASA authorization bill called for NASA to "partner with t he private sector and philanthropic organizations to the maximum extent pra cticable to search for 'technosignatures'\, such as radio transmissions\, in order to meet the NASA objective to search for life's origin\, evolution \, distribution\, and future in the universe." In this talk I will discuss how NASA is addressing this task and what the expectations are for life elsewhere in the universe.

Notes: Coffee\, Tea &\; Snacks 4: 15-4:30 PM LAST-MODIFIED:20190302T181227Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190520T150000Z DTEND:20190520T201500Z DTSTAMP:20260828T094430Z UID:30cp239qel255l7f2snjb9d6qb@google.com CREATED:20190509T205312Z DESCRIPTION:Schedule (LINK TO ABSTRACTS)

11 :00AM Victor Galitski "Quantum Lyapunov Exponents"

11:45AM Yunxian g Liao "Two-Fluid Hydrodynamics and Viscosity Suppression in Fluctuating Su perconductors"

2:00PM Robert Throckmorton "Several topics in qubit error correction"

2:45PM Yi-Ting Hsu "Inversion-protected topologi cal crystalline superconductivity in monolayer WTe$_2$ "

3:30PM Anib al Iucci "Quantum phase diagram of Shiba impurities from bosonization"
< br>
website: https://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190510T232348Z LOCATION:CMTC Conference Room (2205 John S. Toll Physics Bldg.) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Spring Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200925T160000Z DTEND:20200925T164500Z DTSTAMP:20260828T094430Z UID:4639s72g7736kb3nu5ku5amfqt@google.com CREATED:20200916T172750Z DESCRIPTION:Title: Dynamics of Confined Domain Walls in a Quantum Simulator
Speaker: Patrick Becker
Time : 12 - 12:45pm\, Friday\, Sept 25
Seminar will be held via Zoom: \;https://umd.zoom.us/s/97099328991 \;and Meeting ID : 9 70 9932 8991

Confinement is a ubiquitous mechanism in nature\, where by particles feel an attractive force that increases without bound as they separate. A prominent example is color confinement in particle physics\, in which baryons and mesons are produced by quark confinement. Analogously\, confinement can also occur in low-energy quantum many-body systems when ele mentary excitations are confined into bound quasiparticles. We report the o bservation of magnetic domain wall confinement in an interacting spin chain with a trapped-ion quantum simulator. By measuring how correlations spread \, we show that confinement can dramatically suppress information propagati on and thermalization in such many-body systems. We are able to quantitativ ely determine the excitation energy of domain wall bound states from non-eq uilibrium quench dynamics. Furthermore\, we study the number of domain wall excitations created for different quench parameters\, in a regime that is difficult to model with classical computers. LAST-MODIFIED:20200916T172750Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI/QuICS/CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181019T160000Z DTEND:20181019T164500Z DTSTAMP:20260828T094430Z UID:3gfu95tpdns5jegj28m485kbns@google.com CREATED:20180925T202955Z DESCRIPTION:Title: Thermodynamics of individual one-dimensional Bose gases\ n\nSpeaker: Francisco Salces Carcoba\, JQI\n\nAbstract: In this talk I will describe a recent experiment involving an uncommon realization of individu al one-dimensional Bose gases (1DBGs) using a single high aspect-ratio dipo le trap. While this realization aims to enable the study of multi-component \, strongly interacting bosons in 1D\, we start by fully characterizing the thermodynamic state of a much simpler\, single-component\, interacting 1DB G via its equation of state. We benchmark our measurement against the exact ly known Yang-Yang thermodynamics and learn that even though our 1DBG under goes evaporative cooling\, it simultaneously escapes degeneracy. I shall di scuss the prospects and challenges of future experiments in the context of these results.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20180925T202955Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190905T123000 DTEND;TZID=America/New_York:20190905T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20190905T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Population collapse in elite-dominated societies: A diff erential equation model without differential equations\nSpeaker: James York e and Naghmeh Akhavan\nUniversity of Maryland | Department of Mathematics\n \nAbstract: We discuss models of interactions with the environment by human populations\, both between poor and rich people\, "Commoners'' and "Elites ''. The Elites control the society's wealth and consume it at a higher rate than Commoners\, whose work produces the wealth. We say a model is “Elite- dominated” when the Elites' per capita population change rate is always at least as large as the Commoners'.\nWe can show the model always exhibits po pulation crashes for all choices of parameter values for which it is Elite- dominated. But any such model with explicit equations raises questions of h ow the resulting behaviors depend on the details of the models. How importa nt are the particular design features codified in the differential equation s?\nWe discard the differential equations\, replacing them with qualitative conditions that the original model satisfies\, and we prove these conditio ns imply population collapse must occur. In particular\, one condition is t hat the model is Elite-dominated.\nOur approach of introducing qualitative mathematical hypotheses can better show the underlying features of the mode l that lead to collapse. We also ask how societies can avoid collapse. LAST-MODIFIED:20190828T232301Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161031T110000 DTEND;TZID=America/New_York:20161031T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161031T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Laurens Molenkamp\, \n\nSpeaker Institution: Univ ersität Würzburg\n\nTitle: Topological Physics in HgTe-based Quantum Device s\n\nAbstract: Suitably structured HgTe is a topological insulator in both 2- (a quantum well wider than some 6.3 nm) and 3 (an epilayer grown under tensile strain) dimensions.\n\nThe material has favorable properties for qu antum transport studies\, i.e. a good mobility and a complete absence of bu lk carriers\, which allowed us to demonstrate variety of novel transport ef fects.\n\nOne aspect of these studies is topological superconductivity\, wh ich can be achieved by inducing superconductivity in the topological surfac e states of these materials. Special emphasis will be given to recent resul ts on the ac Josephson effect. We will present data on Shapiro step behavio r that is a very strong indication for the presence of a gapless Andreev mo de in our Josephson junctions\, both in 2- and in 3-dimensional structure. An additional and very direct evidence for the presence of a zero mode is o ur observation of Josephson radiation at an energy equal to half the superc onducting gap.\n\nControlling the strain of the HgTe layers strain opens up yet another line a research. We have recently optimized MBE growth of so-c alled virtual substrates ((Cd\,Zn)Te superlattices as a buffer on a GaAs su bstrate)\, that allow us to vary the strain from 0.4% tensile to 1.5% compr essive. While tensile strain turns 3-dimensional HgTe into a narrow gap ins ulator\, compressive strain turns the material into a topological (Weyl) se mimetal\, exhibiting clear signs of the Adler-Bell-Jackiw anomaly in its ma gnetoresistance. In quantum wells\, compressive strain allows inverted ener gy gaps up to 60 meV.\n\nHosted by Mohammad Hafezi\, Charles Clark and Vict or Yakovenko. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20181026T183000Z DTEND:20181026T200000Z DTSTAMP:20260828T094430Z UID:4392cp3ipfiq6kktpe3o51434b@google.com CREATED:20181016T132111Z DESCRIPTION:

Title: A Local First Law of Gravity

Speaker: Andrew Svesko\, Ari zona State University

Abstract: After summarizing a recent derivatio n of Einstein’s equations from the thermodynamics of future stretched light cones\, I will present a local first law of thermodynamics connecting gravi tational entropy\, and matter energy and work\, i.e.\, a hybrid law of matt er and spacetime thermodynamics. How these results relate to the entangleme nt equilibrium conjecture will be discussed. LAST-MODIFIED:20181016T132120Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190227T210000Z DTEND:20190227T223000Z DTSTAMP:20260828T094430Z UID:5hv2p9khrrqj0pgnktb6n87ti7@google.com CREATED:20190222T201439Z DESCRIPTION:**Postponed from snow day**\n\nTitle : "Summary of the IAS Work shop on Future Colliders"\n\nSpeaker Name: Sarah Eno\, University of Maryla nd \n\nAbstract : In this talk\, I'll show selected slides from the speaker s at the IAS workshop in Hong Kong on future colliders. Progress on the ILC \, FCCee\, FCChh\, HE-HLC\, HL-LHC\, CEPC\, CLIC and other colliders\, as p resented by the speakers\, will be shown. LAST-MODIFIED:20190222T201454Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190909T190000Z DTEND:20190909T203000Z DTSTAMP:20260828T094430Z UID:755fp1ppsrtg6l0jkddeaf2ha4@google.com CREATED:20190724T174501Z DESCRIPTION:
Speaker: Tim Cohen\, U of Oregon


Title: Chasing Accreted Milky Way Structures within Gaia DR2 using Deep Learning

Abstract: The Gaia satellite has provided u s with an unprecedented view of our Galaxy by measuring the phase space of a billion stars. This data can be leveraged to learn about the accretion h istory of the Milky Way. In order to maximize the statistical power of the Gaia data\, we developed a deep neural network based approach to classify stars as having been accreted using phase space alone. We then explore the astrophysical implications of this dataset\, and argue for the presence of a new stream\, that we call Nyx. In this talk\, I will describe our machi ne learning methodology\, demonstrate how we extract structures from our ca talog of accreted stars\, and discuss the properties of Nyx. LAST-MODIFIED:20190815T190447Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200211T193000Z DTEND:20200211T203000Z DTSTAMP:20260828T094430Z UID:1qv45nvc266q5h30s1tv42fmei@google.com CREATED:20200129T184422Z DESCRIPTION:
Ben Nachman\, Lawrence Berkeley National Laboratory


Uncovering Fundamental and Emergent Properties of the Strong Force with Hadronic Jets LAST-MODIFIED:20200207T202121Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181115T190000Z DTEND:20181115T203000Z DTSTAMP:20260828T094430Z UID:5l1j17osvu9h5hanm45ur94qhk@google.com CREATED:20180823T193752Z DESCRIPTION:Title: Strain-tuned topological phase transition in ZrTe5

Speaker: Jiun-Haw Chu\, University of Washington

Abstract:  \;
Band insulators with time reversal symmetry can be classified into normal insulators (NI)\, weak topological insulators (WTI) and strong topological insulators (STI) based on their Z2 topological indices. Changin g Z2 indices requires closing and reopening the bandgap\, and topologically distinct insulating phases are separated by a gapless Dirac or Weyl semime tal phase. The van der Waal layered material ZrTe5 is a prototypical exampl e that the emergence of massive 3D Dirac fermions is due to its proximity t o the STI-WTI phase boundary. In this talk\, I will demonstrate that a STI- WTI topological phase transition can be induced by applying uniaxial stress to ZrTe5\, and make the case that the in-situ tunable strain is a powerful to study and control topological materials. In addition\, due to the low c arrier density in this material\, the lowest Landau level can be reached wi thin a few tesla of magnetic field. I will describe the unusual angle depen dent magnetotransport behavior in the quantum limit magnetic fields.


Host: Paglione


Refreshments Served at 1:30pm Joh n S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181105T224134Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Jiun-Haw Chu\, University of Washington TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190916T150000Z DTEND:20190916T160000Z DTSTAMP:20260828T094430Z UID:52l838kre5anlok4k2b1aobe2k@google.com CREATED:20190904T142424Z DESCRIPTION:Title : Simulations of plasma filaments in stellarator geometri es with BSTING\n\nSpeaker Name: Brendan Shanahan\n\nSpeaker Institution : M ax Planck Institut fur Plasmaphysik\, Greifswald\n\nNotes:Abstract : Wendel stein 7-X has exhibited novel edge and scrape-off-layer physics in the firs t experimental campaign. Edge filaments [1] and high frequency heat flux va riations [2] are among many new observations which merit numerical investig ation. While there are several edge fluid turbulence frameworks for tokamak geometries\, the complicated nature of a stellarator edge and scrape-off-l ayer has as yet inhibited the development of a fluid turbulence framework f or stellarator geometries. One of these simulation frameworks written for t okamak geometries\, BOUT++ [3]\, is also able to simulate phenomena such as ELMs\, magnetic reconnection\, plasma transport and neutral interactions. The BSTING project [4] has extended BOUT++ to stellarator geometries\, ther eby providing the first nonlinear fluid simulation framework for non-axisym metric geometries.\n\nHere we outline recent developments in the BSTING pro ject\, including a newly implemented curvilinear grid system suitable for s tellarator edge magnetic topology\, and present simulations of plasma filam ents in stellarator geometries [4]. Results from simulations of filaments d ynamics in non-uniform drive scenarios [5] and in regions of strongly-varyi ng connection lengths\, such as the view from the planned Gas Puff Imaging diagnostic on W7-X\, are also included. Initial investigations of ablated p ellet interaction using the Hermes [6] fluid turbulence model are presented . Finally\, a discussion of the relevance and application of these methods to Wendelstein 7-X edge turbulence scenarios is provided.\n\n[1] G. Kocsis\ , et al.\, 44th EPS Conference on Plasma Physics (2017).\n[2] G. A. Wurden\ , et al.\, Nuclear Fusion 57\, 056036 (2017).\n[3] B D Dudson et al.\, Comp . Phys. Comm. 180 9 1467-1580 (2009).\n[4] B Shanahan et al.\, Plasma Phys. Control. Fusion 61 0250007 (2019).\n[5] B Shanahan et al.\, J. Phys.\; Con f. Series 1125 012018 (2018).\n[6] B D Dudson and J Leddy Plasma Phys. Cont rol. Fusion 59 054010 (2017).\nTitle of Event:\nEdits: LAST-MODIFIED:20190904T142649Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190327T200000Z DTEND:20190327T210000Z DTSTAMP:20260828T094430Z UID:2k33l3qk02akiuaq338sv9gm66@google.com CREATED:20190322T131607Z DESCRIPTION:Title : Role of stable modes in shear-flow turbulence\n\nSpeake r: Adrian Fraser\, University of Wisconsin \n\nAbstract : Sheared flows are found in a variety of fusion and astrophysical systems\, where they may be come unstable and drive turbulence. While the effects of physical parameter s on the underlying instability's threshold and growth rate are often well- understood\, in many cases their effect on the resulting turbulence is much less clear. I will discuss ongoing efforts towards understanding how the K elvin-Helmholtz (KH) instability\, the canonical shear flow instabiliy\, sa turates and drives turbulence. Particularly\, I will discuss the role playe d by linearly stable (damped) modes\, which have been shown to be important in other fusion-relevant systems. Analytical calculations show that these stable modes\, universally neglected in reduced KH models\, are in fact non linearly pumped to significant amplitudes in saturation. At these amplitude s\, they present a large-scale energy sink for turbulent fluctuations\, and can change the evolution of the mean flow. Additionally\, I will discuss g yrokinetic simulations of a driven\, KH-unstable flow\, where observations of unstable and stable mode amplitudes in the fully-developed turbulent sta te have informed successful reduced models for how the mean flow scales wit h physical parameters. These findings have motivated ongoing work to use st able modes to help understand how KH saturation in MHD is affected by equil ibrium magnetic fields. LAST-MODIFIED:20190322T131613Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181004T170000Z DTEND:20181004T183000Z DTSTAMP:20260828T094430Z UID:2gdkrha3mo80ck2an7ip829muf@google.com CREATED:20180828T143432Z DESCRIPTION:\nTitle: Complex Langevin in Nonrelativistic Rotating Bosonic S ystems\n\nSpeaker: Casey Berger\, UNC Chapel Hill\n\nAbstract: Quantum fiel d theories with a complex action suffer from a sign problem in stochastic n onperturbative treatments\, making many systems of great interest - such as polarized or mass-imbalanced fermions and QCD at finite baryon density – e xtremely challenging to treat numerically. Another such system is that of b osons at finite angular momentum\; experimentalists have successfully achie ved vortex formation in supercooled bosonic atoms\, and have measured quant ities of interest such as the moment of inertia. However\, the rotation res ults in a complex action\, making the usual numerical treatments of the the ory unusable. In this work\, we use complex stochastic quantization to calc ulate basic properties of interacting bosons at finite angular momentum. LAST-MODIFIED:20180925T170331Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181022T190000Z DTEND:20181022T203000Z DTSTAMP:20260828T094430Z UID:0hnnvs17j691ge03npb95eqa8c@google.com CREATED:20181016T125942Z DESCRIPTION:Title: Severe Constraints on New Physics Explanations of the Mi niBooNE Excess

Speaker: Gordan Krnjaic\, Fermilab

Abstract: T he MiniBooNE experiment has recently reported an anomalous 4.5 \\sigma
e xcess of electron-like events consistent with \\nu_e appearance from a
\ \nu_\\mu beam at short-baseline. Given the lack of corresponding \\nu_\\mu< br>disappearance observations\, required in the case of oscillations involv ing a
sterile flavor\, there is strong motivation for alternative explan ations of this
anomaly. We consider the possibility that the observed el ectron-like signal may
actually be due to hypothetical new particles\, w hich do not involve new sources
of neutrino production or oscillations. We find that the electron-like event
energy and angular distributions in the full MiniBooNE data-set\, including
neutrino mode\, antineutrino mo de\, and beam dump mode\, severely limit\, and in
some cases rule out\, new physics scenarios as an explanation for the observed
neutrino and an tineutrino mode excesses. Specifically\, scenarios in which the
new part icle decays (visibly or semi-visibly) or scatters elastically in the
det ector are strongly disfavored. Using generic kinematic arguments\, this pap er
extends the existing MiniBooNE results and interpretations to exhaust ively
constrain previously unconsidered new physics signatures and empha sizes the
power of the MiniBooNE beam dump search to further constrain m odels for the
excess.
LAST-MODIFIED:20181016T125942Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190909T203000Z DTEND:20190909T213000Z DTSTAMP:20260828T094430Z UID:5vc09eg0d20e2njjh0huqk0bsi@google.com CREATED:20190817T035720Z DESCRIPTION:Title: CubeSats and Multi-Messenger Time Domain Astronomy
Speaker: Jacob Smith\, NASA GSFC and CRESST/University of Maryland\, Coll ege Park

Abstract: A new era of multi-messenger time domain astronom y broke ground after the first simultaneous detection of a short gamma-ray burst (SGRB) with a gravitational-wave (GW) signal. Coincident detections e nable hundreds of electromagnetic observations that probe many areas of ast rophysics such as jet physics\, neutron star equation of state\, speed of g ravity\, and heavy element production. In order to increase the number of S GRB-GW simultaneous detections\, the gamma-ray community needs broad-band s ky coverage and continued sensitivity. BurstCube\, a CubeSat for Grav itational Wave Counterparts\, aims to expand sky coverage of the current su ite of GRB monitors in order to detect and localize gamma-ray bursts (GRBs) . BurstCube will be comprised of 4 Cesium Iodide scintillators coupled to a rrays of Silicon photo-multipliers on a 6U CubeSat bus (a single U correspo nds to cubic unit approx. 10 cm on each side) and will be sensitive to gamm a-rays between 50 keV and 1 MeV\, the ideal energy range for GRB prompt emi ssion. BurstCube will assist current observatories\, such as Swift and Ferm i\, in the detection of GRBs as well as provide astronomical context to gra vitational wave events detected by Advanced LIGO\, Advanced Virgo\, and KAGRA. BurstCube is currently in its development and testi ng phase to prepare for launch readiness in the fall of 2021. I present the BurstCube mission concept\, preliminary performance\, and current status.< br>
Notes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20190817T035720Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191114T123000 DTEND;TZID=America/New_York:20191114T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191114T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Data-Assisted Forecasting of Chaotic Dynamical Systems u sing Partial State Measurements\nSpeaker: Jaideep Pathak\nUMD | Physics and IREAP\n\nAbstract: We consider the problem of data-driven forecasting of c haotic dynamical systems when the available data is from a sparse spatial s ampling\, i.e.\, the full state of the dynamical system cannot be observed directly. Recently\, there have been several promising data-driven approach es to forecasting of chaotic dynamical systems using machine learning. Part icularly promising among these are hybrid approaches that combine machine l earning with a knowledge-based model\, where a machine learning technique i s used to correct the imperfections in the knowledge-based model. Such a hy brid approach is promising when a knowledge-based model is available but is imperfect due to incomplete understanding of the physical processes in the underlying dynamical system. However\, previously proposed data-driven for ecasting approaches assume knowledge of the full state of the dynamical sys tem. We seek to relax this assumption by using a data assimilation techniqu e along with Machine Learning in a novel technique that improves forecasts. We demonstrate that using partial measurements of the state of the dynamic al system we can train a machine learning model to correct model error in a n imperfect knowledge-based model. LAST-MODIFIED:20191104T185638Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200207T180000Z DTEND:20200207T190000Z DTSTAMP:20260828T094430Z UID:597hq30s2vbae91s4182vok7qt@google.com CREATED:20200122T134320Z DESCRIPTION:Speaker: Mary Dorman and Timothy Koeth\, UMD (Safety)\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200203T135506Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200831T150000Z DTEND:20200831T160000Z DTSTAMP:20260828T094430Z UID:0ongqgum1joqebkccmenr3fb9v@google.com CREATED:20200828T130349Z DESCRIPTION:

The unexpected Bose firewor ks

Speaker: Cheng Chin


Institution: James Franck institute \, Enrico Fermi institute\, University of Chicago



Experim ents frequently come with surprises. In this talk\, I will describe the sto ry behind the discovery of Bose fireworks\, a sudden emission of matterwave jets from a driven Bose-Einstein condensate. The jet emission originates f rom collective scattering of atoms\, seeded by quantum fluctuations and amp lified by bosonic stimulation. The process results in an intricate jet emis sion pattern resembling those observed in high-energy collisions of heavy i ons as well as Unruh radiation near the event horizon. It also offers us ne w insight to understand spontaneous pattern formation and molecular Bose-Ei nstein condensate. I will describe the intriguing journey we have had and f uture goals associated with the Bose fireworks.


We are hosting the F all 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliate s will receive a Zoom link in an email announcing each seminar. For those w ithout access to Zoom\, we will also be live streaming each seminar on YouT ube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https ://www.youtube.com/user/JQInews(link is external). LAST-MODIFIED:20200828T130349Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190128T200000Z DTEND:20190128T213000Z DTSTAMP:20260828T094430Z UID:0m0lrnbigh6nv4oetf7hs8o14f@google.com CREATED:20190128T154401Z DESCRIPTION:

Title: Observable Signatures of Dark Photons from Supernovae
Abstract: In this talk I will discuss observable signals from visibly decaying dark photons produced inside Supernovae. This signals allow us to extend Supernova bounds on dark photons by more than two orders of magnitud e on the mixing parameter.
LAST-MODIFIED:20190128T154401Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gustavo Marques Tavares\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181119T213000Z DTEND:20181119T223000Z DTSTAMP:20260828T094430Z UID:06vru2k0u5iovsg7ndfqlkcsg3@google.com CREATED:20181030T065635Z DESCRIPTION:Title: The Continuing Mystery of Multiple Spectral Components i n Jets from Black Holes

Speaker: Eileen Meyer\, University of Maryla nd\, Baltimore County

Abstract: One of the first things that astrono mers usually determine for any new astrophysical source class is the emissi on process generating the radiation -- thermal\, synchrotron\, inverse Comp ton\, Bremsstrahlung\, etc. Identifying these processes is critical to usin g the EM observations to probe the physical environments of very distant ob jects. Despite the fact that jets from black holes were first understood to exist over 40 years ago\, we are still in ignorance about many primary asp ects of these systems -- including the radiation mechanism at high energies \, the particle makeup of the jets\, and how particles are accelerated\, po ssibly to energies as high as 100 TeV and hundreds of kpc from the central engine. I will discuss how this mystery first really got going with the lau nch of Chandra in 1999\, and show how high-resolution observations with obs ervatories like Hubble and ALMA have continued to add pieces to the puzzle -- sometimes seemly solving a problem\, and other times opening a new one. I will conclude with some perspectives on how new observatories\, like the Chandra successors AXIS and Lynx\, can help us solve these long -open questions in jet physics. \;

Notes: Coffee\, Tea &\; Sn acks 4:15-4:30 PM LAST-MODIFIED:20181030T065635Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200211T200000Z DTEND:20200211T210000Z DTSTAMP:20260828T094430Z UID:6vsv1g5lfledm35nsmvtn8l8sk@google.com CREATED:20200206T194207Z DESCRIPTION:Speaker Name: Prof. Yanne Chembo\nSpeaker Institution : Univers ity of Maryland\, Electrical and Computer Engineering Department\n\nAbstrac t : Microwave photonics has emerged as a promising platform to provide tech nological solutions for microwave generation and sensing. In particular\, o ptoelectronic oscillators and Kerr optical frequency combs have emerged as leading benchmarks\, and they are today at the center of a very large body of scientific literature. The aim of this talk is to provide a comprehensiv e overview of this field\, to outline the latest achievements\, and to disc uss the main challenges ahead.\n*NEW POLICY: All Visitors to LPS must prese nt a photo ID for entry to the colloquium*\n\n\nNote: LPS is located at 805 0 Greenmead Drive in College Park. There is parking at LPS and overflow par king at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the phon e on the left hand side of the front door to call the receptionist for entr y.\nFor more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20200206T194207Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201130T160000Z DTEND:20201130T170000Z DTSTAMP:20260828T094430Z UID:2opfbs6f58obtpofvsrb1pib7q@google.com CREATED:20201118T174105Z DESCRIPTION:
Email Rcawthor@umd.edu for Zoom details \;
< dd>
Speaker: Xiao-Gang Wen \;(MIT)\, Zoom sem inar

Title: \;Categorical symmetry and non- invertible gravitational anomaly: Understanding strongly correlated gapless systems.

Abstract: \;Using some 1d example s\, we show the emergence of symmetry and dual symmetry in gapless states\, which may be a general feature for all gapless state. The symmetry and dua l symmetry together is called categorical symmetry which is same as non-inv ertible gravitational anomaly. We will use this point of view to study some new strongly correlated gapless states.
LAST-MODIFIED:20201118T174105Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190429T110000 DTEND;TZID=America/New_York:20190429T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190429T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Measuring the entropy of a single spin\n\nSpeaker: Josua Folk\, UBC\n\nAbstract: Entropy measurements offer a powerful tool for ide ntifying the underlying microscopic character of electronic states. Such m easurements are typically based on bulk properties that are straightforward to observe in macroscopic samples\, but exceedingly difficult to access in mesoscopic systems that may consist of just a few electrons or quasipartic les. Taking advantage of a well-known Maxwell relation\, we realize a proto col for entropy-to-charge conversation in a gate-defined GaAs quantum dot t hat enables an entropy measurement of the first three quantum states in the dot. The entropy of a single spin (k_B ln2) is measured with a few percent accuracy\, as is the entropy arising at the magnetic field-driven singlet- triplet crossing for two electrons. Future prospects for identifying more e xotic quantum states such as 2-channel Kondo states\, non-Abelian Moore-Rea d quasiparticles\, and Majorana quasiparticles in semiconductors will be di scussed. LAST-MODIFIED:20190426T190558Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200315T170000Z DTEND:20200315T190000Z DTSTAMP:20260828T094430Z UID:1sq8v66u16ubieh5cq58n9nfgr@google.com CREATED:20191206T190527Z DESCRIPTION:https://umdphysics.umd.edu/about-us/news/department-news/1515-j oseph-sucher.html LAST-MODIFIED:20200311T202314Z LOCATION:Lobby of the Physical Sciences Complex SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CANCELLED: Memorial Service for Joe Sucher TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191003T150000Z DTEND:20191003T163000Z DTSTAMP:20260828T094430Z UID:1jegdtf1to8gdit3lqme8e6jh2@google.com CREATED:20190815T182133Z DESCRIPTION:Speaker: Itay Hen\, University of Southern California\n\nTitle: Novel methods for simulating quantum many-body physics on classical and qu antum computers\n\nAbstract: In this talk I will discuss a novel\, paramete r-free Trotter error-free series expansion for quantum canonical partition functions. I will show how the expansion may be used to devise a quantum Mo nte Carlo algorithm capable of simulating the equilibrium physics of a very broad range of physical models within a single unifying framework. LAST-MODIFIED:20190920T175106Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190402T171500Z DTEND:20190402T181500Z DTSTAMP:20260828T094430Z UID:49ktrilhm1g5batuctied33jme@google.com CREATED:20190205T174726Z LAST-MODIFIED:20190205T174824Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190410T190000Z DTEND:20190410T203000Z DTSTAMP:20260828T094430Z UID:7i8r4ushglmop1c77smdiuau3p@google.com CREATED:20190307T143338Z DESCRIPTION:Albert Roura\, University of Ulm\n\nTitle: "Relativistic effect s in macroscopically delocalized quantum superpositions"\n\nAbstract: Rema rkable advances in atom interferometry have enabled the creation of \nmacro scopically delocalized quantum superpositions with atomic wave \npackets se parated up to half a meter. Nevertheless\, in all cases \nrealized so far t he differences in the dynamics of the two wave packets \nof the superpositi on can be entirely described in terms of Newtonian \nmechanics. Therefore\, the creation of delocalized coherent \nsuperpositions of quantum systems e xperiencing different relativistic \neffects that cannot be accounted for b y Newtonian mechanics is an \nimportant milestone in future research at the interface of gravity and \nquantum mechanics. This could be achieved by ge nerating a superposition \nof quantum clocks that follow paths with differe nt gravitational time \ndilation and investigating the consequences on the interference signal \nwhen they are eventually recombined.\n\nAfter explain ing the major challenges that quantum-clock interferometry \nbased on light -pulse atom interferometers is confronted with (including \ntheir insensiti vity to gravitational redshift in a uniform field)\, I \nwill present a pro mising scheme capable of measuring the effects of \ngravitational time dila tion in interfering quantum clocks. Its \nexperimental implementation shoul d be within reach of the 10-meter \natomic fountains of Sr and Yb atoms tha t will soon become available in \nStanford and HITec (Hannover) respectivel y. LAST-MODIFIED:20190329T173808Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191018T140000Z DTEND:20191018T153000Z DTSTAMP:20260828T094430Z UID:1lgp26nj7chqpv4r48ogv8nimo@google.com CREATED:20190820T185941Z DESCRIPTION:Speaker: Mark Caprio\, University of Notre Dame\n\nTitle: Emerg ent dynamical symmetry in the nuclear\nmany-body system from its ab initio description\n\nAbstract: Ab initio nuclear theory provides a predictive and experimentally val-\nidated microscopic framework for quantitatively descr ibing the nuclear\n\nmany-body system\, directly from the interactions of i ts constituent nu-\ncleons. With this foundation established\, we may now l ook to ab initio\n\nnuclear theory as means for obtaining a fundamental und erstanding of\n\nemergent nuclear correlations and collective phenomena. In this semi-\nnar\, we will see how ab initio calculations demonstrate the r elevance of\n\nsymplectic dynamical symmetry\, associated with the symplect ic group\nSp(3\, R) of phase space in three dimensions and its SU(3) subgro up\, as\n\nan organizing scheme for collective correlations in light nuclei . In par-\nticular\, we will explore its ability to provide a near complete qualitative\n\nunderstanding of the low-lying calculated spectrum of the n ucleus 7Be\,\nincluding rotational collective features. LAST-MODIFIED:20191016T170635Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200911T173000Z DTEND:20200911T183000Z DTSTAMP:20260828T094430Z UID:763b81vuked4v4t4u3c6sug7ou@google.com CREATED:20200911T171108Z DESCRIPTION:Speaker: \;Andrew Christianson\, Oak Ridge National Laboratory< br>Title
Abstract: TBA
Host: N. Butch

For the zoom link please email Kristin Stenson at \;QMC@umd.edu \; \; LAST-MODIFIED:20200911T171108Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Andrew Christianson\, Oak Ridge National Laborator y TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201005T180000Z DTEND:20201005T210000Z DTSTAMP:20260828T094430Z UID:32u9a6c2gghidqrpvv9fg2dtpk@google.com CREATED:20200922T141449Z DESCRIPTION:

Biophysics Symposium on "Biological Active Matter"


Presented by the \;Biophysics Program: https://ipst.umd.edu/graduate-programs/ biophysics

Please register by \;filli ng out this short form \;to obtain the Zoom information to attend t he Symposium. \; \; https: //docs.google.com/forms/d/1MF47v642yYB2lR8ro79ZMz6vSwK7KyamH4C4dQKB4Fo/view form?edit_requested=true


Monday\, October 5th (2 - 5 pm)
  • 2:00 pm: \;Introductory remarks
    • 2:05 - 2:45 pm: Nikta Fakhri \; (MIT) \;Broken symmetries in living active matter
  • 2:50 - 3:30 pm: Aaron Dinner \; (U Chicago) \;Toward a predictive model of cytoskeletal dynamics
    • 3:35 - 4:15 pm: Alexandra Zidovska \;(NYU) \;The "self-sti rred" genome: Dynamics\, flows and rheology
  • 4:20 - 5:00 pm: Mich ael Murrell \;(Yale University) Traction-independent cellular flows in cell aggregates
  • 5:00 - 5:15 pm: \;Final remarks and informal discussion


Organi zers: \; Arpita Upadhyaya \; arpitau@umd.edu

&n bsp\; and Garegin Papoian \; gpapoian @umd.edu

 \;

LAST-MODIFIED:20201001T180513Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Symposium on "Biological Active Matter" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200130T190000Z DTEND:20200130T200000Z DTSTAMP:20260828T094430Z UID:6ep0909jmsqcv4n24ljdm9o82u@google.com CREATED:20190909T175931Z DESCRIPTION:Speaker: Cagliyan Kurdak\, University of Michigan
Title:&nbs p\;Robustness of the Insulating Bulk and the Conducting Surface in the Topo logical Kondo Insulator SmB6
Abstract: \;
The prediction of the t opological Kondo insulator behavior in samarium hexaboride (SmB6) and the v erification of robust surface conduction below 4 K have led to a large effo rt to understand the surface states in this material. Moreover\, recent mag netization measurements suggest that the material might have an unconventio nal bulk Fermi surface\, even though the material is electrically insulatin g with a well-defined gap. The results are so far only observed in “spe cial samples” that are grown by the floating zone method. The unconven tional bulk Fermi surface\, with a truly insulating gap\, requires exotic e xcitations\, such as composite excitons\, neutral spinons\, or Majorana fer mions\, which couple to a magnetic field but not to an electric field. Expe rimental demonstration of such novel low energy excitations would be a grea t achievement as it would indicate the bulk of SmB6 must harbor one of the most unusual quantum states of matter. In this work\, we study the transpor t properties of SmB6 grown both floating zone and Al flux methods with the goal of resolving why these excitations occur in special samples. In additi on to standard Hall and Corbino measurements\, we have a new type of resist ance measurement\, inverted resistance measurement\, to study electrical co nduction in this material system. This new method allows us to characterize the bulk conductivity\, even in situations where surface conduction domina tes transport by many orders of magnitude. We find the bulk resistivity exh ibits an activated behavior that extends over 10 orders of magnitude with a n activation energy of 4.0 meV. This is a remarkable result as it would not happen in any other topological insulator or semiconductor. Furthermore\, samples grown with off-stoichiometric growth conditions exhibit activated b ehavior with similar activation energies\, suggesting that SmB6 is an ideal insulator that is immune to point defects. On the other hand. extended def ects such as one-dimensional dislocations and surface cracks may still be p resent would provide additional current paths beside the topologically prot ected surface state in this material system. I will discuss some of the new theories emerging to discuss the robustness of this material. \; \ ; \;

Host: J. Paglione

Refreshments 1:30pm John S Toll Ph ysics Bldg Room 1117 LAST-MODIFIED:20200108T211052Z LOCATION:Room 1201 of the John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Cagliyan Kurdak\, University of Michigan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190521T150000Z DTEND:20190521T160000Z DTSTAMP:20260828T094430Z UID:67pk87r4e03bequfjlqv3j27je@google.com CREATED:20190520T130037Z DESCRIPTION:Title: Many-particle Dephasing after a Quantum Quench \n\nSpeak er: Dr. Lingzhen Guo\, Max Planck Institute for the Science of Light (MPL) \, Erlangen\, Germany \n\nAbstract: After a quench in a quantum many-body s ystem\, expectation values tend to relax towards long-time averages. Howeve r\, temporal fluctuations remain in the long-time limit\, and it is crucial to study the suppression of these fluctuations with increasing system size . For nonintegrable models\, e.g.\, the transverse Ising chain beyond neare st-neighbour coupling\, we show that the temporal fluctuations are exponent ially suppressed by the system size\, due to a newly discovered phenomenon (’many-body dephasing’). We propose that a chain of 5 trapped ions can be u sed to observe persistent temporal fluctuations after a quench. By fitting the experimental data\, we will analyse the noises in the experiments and s how the possibility to observe the universal persistent nonequilibrium beha viour after a quench. LAST-MODIFIED:20190520T130037Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190425T180000Z DTEND:20190425T193000Z DTSTAMP:20260828T094430Z UID:2q53slockltg1nealk2fcuhlnf@google.com CREATED:20190311T130159Z DESCRIPTION:Title: Crystal growth: Twenty Years After: A stroll through the kinetics of thin film growth\, as well as of relaxing and sunbathing nanop articles
Speaker: Alberto Pimpinelli\, Rice University

Abstract:
Very few natural phenomena happen at thermodynamical equilibrium. Kine tic processes determine the morphology of growing crystals\, both in the st ep flow and island nucleation regime\, the relaxation of nanorods towards s urface-minimizing shapes\, as well as the production of steam from a water solution of gold nanoparticles illuminated by sunlight.
I will discuss how statistical mechanics and non-equilibrium thermodynamics allow us to de scribe and predict these very disparate phenomena.
In all cases\, I wil l argue that the coupling of analytical models and numerical methods\, such as Monte Carlo simulations\, can lead us to a quantitative understanding o f the atomistic mechanisms underlying:
• the coexistence of competing s tep bunching and step meandering instabilities at the surface of compound s emiconductors\;
• the nucleation of an adsorbate layer of organic molec ules on a substrate\;
• the morphological evolution of a nanorod and of a colloidal crystals towards their equilibrium shapes\;
• and the inte rplay between collective photon and heat transport in dense nanoparticle so lutions.

Host: Ted Einstein
Refreshments 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20190408T204250Z LOCATION:1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Alberto Pimpinelli\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201218T203000Z DTEND:20201218T213000Z DTSTAMP:20260828T094430Z UID:6ate63ps107vmacahnaa52nedc@google.com CREATED:20201208T133938Z DESCRIPTION:Michael Kreshchuk\, Tufts University

Seminar will be con ducted via zoom.

Title:
Quantum simulation of relativistic field theories in the front form

Abstract:

I will talk about quantu m simulation algorithms based on the light-front formulation of quantum fie ld theory. They will range from ab initio simulations with nearly optimal r esource scalings to VQE-based methods available for existing devices.
My work is greatly inspired by the analogy\, first noted by Kenneth Wilso n\, between the light-front formulation of QFT and quantum chemistry. The a pproach I develop to simulating field theory is an alternative to lattice t echniques\; it allows one to use methods developed for quantum simulation o f quantum chemistry.

For zoom link please email mknouse@umd.edu LAST-MODIFIED:20201208T150040Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint MCFP/JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190920T160000Z DTEND:20190920T170000Z DTSTAMP:20260828T094430Z UID:54r55pdrfn5o5qjm8vsa94r7k7@google.com CREATED:20190912T125032Z DESCRIPTION:Title: How to emulate quantum spin liquids and build topologica l qubits with available quantum hardware\n\nSpeaker: Zhicheng Yang\n\n(pizz a and drinks served 10 min. before talk)\n\nAbstract: We show how to constr uct fully quantum multi-spin interactions using only two-body Ising interac tions plus a uniform transverse field. We then provide an explicit embeddin g of simple gauge models\, such as the surface code\, into the D-Wave chime ra architecture. Taken as whole this is a way to build topological qubits u sing existing hardware. The scheme is generalizable to other gauge-like the ories\, for example those with fractonic topological order such as the X-cu be model. The bottom-up construction of this paper is a blueprint to emulat e topologically ordered quantum spin liquids in programmable quantum machin es. LAST-MODIFIED:20190912T125032Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201102T213000Z DTEND:20201102T223000Z DTSTAMP:20260828T094430Z UID:4867aipigia663s2h30ir8faag@google.com CREATED:20201022T011044Z DESCRIPTION:Title: \;Studying Small-Scale Energy Release in Solar Flare s

Speaker: Lindsay Glesener\, University of Minnesota

Abstrac t: While large\, cataclysmic solar flares and eruptions tend to dominate ou r attention\, there is a great deal to be learned from small\, faint flares . Indeed\, one of the benefits that comes from using the Sun as a case stud y for astrophysical processes is that relatively small\, weakly energetic e vents can be well observed. In the past\, determining how energy is release d and particles are accelerated in solar flares has proved to be an elusive topic. Understanding these properties would elucidate how and when flares occur\, how they relate to coronal mass ejections\, the extent to which the y heat the corona\, and what connections they have with the rest of the hel iosphere. Of particular interest is the energy carried by nonthermal electr ons\, and the mechanisms by which they attain those energies. One way to at tach this topic is by studying how energy release properties scale across f lare size\, from the largest solar eruptions to the smallest micro- or nano -flares. The talk will show recent results from the smallest hard x-ray fla res observed by the FOXSI rocket and NuSTAR spacecraft\, in order to examin e how these properties scale.

Talk recording LAST-MODIFIED:20201104T191039Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201026T110000 DTEND;TZID=America/New_York:20201026T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201026T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Entanglement Hamiltonian Tomography in Quantum Si mulation

Speaker: Peter Zoller\, University of Innsbruck\, Austria
Abstract: \; Entanglement is the crucial ingredient of quantum ma ny-body physics\, and characterizing and quantifying entanglement in quantu m dynamics is an outstanding challenge in today's era of intermediate scale quantum devices. Quantum simulators allow us to observe in quench dynamics the increasing complexity of the many-body wavefunction in evolution towar ds thermodynamic equilibrium\, including regimes inaccessible to classical computation. Here we discuss quantum protocols for spin systems\, allowing an efficient tomographic reconstruction of the reduced density matrix of a subsystem including the entanglement spectrum [1]. The key step is the para metrization of the reduced density matrix in terms of an entanglement Hamil tonian\, which is quasi-local and involves only few-body terms. This is the n fitted to observations from a small number of single-spin random rotation s and measurements. The ansatz is suggested by Conformal Field \; Theor y for quench \; dynamics\, \; and the \; Bisognano-Wichmann&nbs p\; theorem \; for many-body ground \; states. Not only does the pr otocol provide a testbed for these theories in quantum simulators\, \; it is also applicable outside these regimes. \; We show the validity an d efficiency of the protocol for a long-range Ising model in 1D using numer ical simulations. Furthermore\, by analyzing data from 10 and 20 ion quantu m simulators [2]\, we demonstrate measurement of the evolution of the entan glement spectrum in quench dynamics.

[1] C. Kokail\, R. van Bijnen\, A. Elben\, B. Vermersch\, and P. Zoller\, arXiv:2009.09000 (2020)

[ 2] T. Brydges\, A. Elben\, P. Jurcevic\, B. Vermersch\, C. Maier\, B.P. Lan yon\, P. Zoller\, R. Blatt\, and C.F. Roos\, Science 364\, 6437\, p. 260 (2 019)

We are hosting the Fall 2020 JQI Seminars virtually as Zoom mee tings. JQI members and affiliates will receive a Zoom link in an email anno uncing each seminar. For those without access to Zoom\, we will also be liv e streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews& nbsp\;(link \;is external) LAST-MODIFIED:20201003T163225Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200911T140000 DTEND;TZID=America/New_York:20200911T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20200911T140000 CREATED:20200827T172634Z DESCRIPTION:
Seminar will be conducted via zoom: \;Zoom Link

Speaker: Steve Sharpe\, University of Washington

Title: Th ree-particle interactions from the lattice: a progress report

Abstra ct: The formalism needed to determine infinite-volume three-particle scatte ring amplitudes from the finite-volume spectrum of QCD has been developed o ver the last decade. After reviewing the motivation for this work\, and the status of the field\, I describe recent generalizations of both the formal ism and the method of derivation that promise to allow application to all t hree-particle systems of interest. One outcome of this work is a demonstrat ion of the equivalence of the different approaches that have been followed. I also describe the first applications of the formalism to lattice results for the spectrum of three pions of maximal isospin. LAST-MODIFIED:20200910T132625Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190919T160000 DTEND;TZID=America/New_York:20190919T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20190917T160000 CREATED:20190530T191015Z DESCRIPTION:

Donna Strickland\, University of Waterloo
2018 Nobel Laureate

Title: From Nonlinear Optics to High- Intensity Laser Physics
The laser increased the intensity of light that can be ge nerated by orders of magnitude and thus brought about nonlinear optical int eractions with matter. Chirped pulse amplification\, also known as CPA\, ch anged the intensity level by a few more orders of magnitude and helped ushe r in a new type of laser-matter interaction that is referred to as high-int ensity laser physics. In this talk\, I will discuss the differences between nonlinear optics and high-intensity laser physics. The development of CPA and why short\, intense laser pulses can cut transparent material will also be included. I will also discuss future applications.

The Paint Branch Distinguished Lecture in Applied Physics LAST-MODIFIED:20190815T174722Z LOCATION:1101 A. James Clark Hall SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Paint Branch Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181213T190000Z DTEND:20181213T203000Z DTSTAMP:20260828T094430Z UID:4c7pctk634eloea5efejfbolg6@google.com CREATED:20180829T183042Z DESCRIPTION:Title: A high-energy density antiferroelectric made by i nterfacial electrostatic engineering


Speaker: Juli a Mundy\, Harvard University


Abstract: \;
< br>Dielectric capacitors hold a tremendous advantage for energy storage due to their fast charge/discharge times and stability in comparison to bat teries and supercapacitors. A key limitation to today’s dielectric capacito rs\, however\, is the low storage capacity of conventional dielectric mater ials. To mitigate this issue\, antiferroelectric materials have been propos ed\, but relatively few families of antiferroelectric materials have been i dentified to date. Here\, we propose a new design strategy for the construc tion of lead-free antiferroelectric materials using interfacial electrostat ic engineering. We begin with a multiferroic material with one of the highe st known bulk ferroelectric polarizations\, BiFeO3. We show that by confini ng atomically-precise thin layers of BiFeO3 in a dielectric matrix that we can induce a metastable antiferroelectric structure. Application of an elec tric field reversibly switches between this new phase and a ferroelectric s tate\; in addition\, tuning of the dielectric layer causes coexistence of t he ferroelectric and antiferroelectric states. Precise engineering of the s tructure generates an antiferroelectric phase with energy storage comparabl e to that of the best lead-based materials. Neutron scattering results show that the interfaces of this structure could further host novel magnetic be havior. The use of electrostatic confinement provides a new pathway for the design of engineered antiferroelectric materials with large and potentiall y coupled responses.
Host: Lynn


Refreshment s Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181206T153721Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Julia Mundy\, Harvard University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181210T110000 DTEND;TZID=America/New_York:20181210T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181210T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Spins in InAs quantum dots: qubits\, sensors\, and photo n sources \n\nSpeaker: Sam Carter\, Navy Research Lab\n\nAbstract: Over th e past few decades a number of exciting applications of quantum coherence a nd entanglement have been developed that promise fundamental improvements i n a variety of areas\, including computing\, secure communications\, and se nsing. A team of scientists at the Naval Research Laboratory have been work ing for many years to develop a physical implementation for these quantum i nformation applications using semiconductor indium arsenide quantum dots QD s). This system has the advantages of a robust solid state host\, strong op tical transitions\, mature device fabrication\, tunable properties\, and a scalable\, monolithic architecture. A single electron or hole spin within a QD acts as a stationary quantum bit that can be optically controlled on a picosecond timescale. In this presentation\, I will discuss how a spin in a QD or in a pair of coupled QDs can also be used for sensing mechanical mot ion and for generating tunable single photons. To sense motion\, QDs have b een incorporated into mechanical resonators\, which couple to the dots thro ugh strain. When mechanical resonators are driven\, the optical transitions of QDs shift significantly1\, and the spin states shift as well. In single QDs\, the hole spin shows much stronger coupling to strain than electrons spins\, due to the stronger spin-orbit interaction. In coupled QDs\, a pair of interacting electron spins can be made highly sensitive to strain gradi ents that change the relative QD energies. To generate photons\, we make u se of the Raman spin-flip process2\, which has the advantage of generating photons with properties determined by the drive laser and the spin properti es. In this way\, we are able to demonstrate spectral and temporal control over single photon wavepackets3\, with very low two photon emission probabi lity and high indistinguishability.\nThis work is supported by the U.S. Off ice of Naval Research and the OSD Quantum Sciences and Engineering Program. \n1.Carter\, S. G. et al. Sensing flexural motion of a photonic crystal mem brane with InGaAs quantum dots. Appl. Phys. Lett. 111\, 183101 (2017).\n2.S weeney\, T. M. et al. Cavity-stimulated Raman emission from a single quantu m dot spin. Nat. Photonics 8\, 442–447 (2014).\n3.Pursley\, B. C.\, Carter\ , S. G.\, Yakes\, M. K.\, Bracker\, A. S. & Gammon\, D. Picosecond pulse sh aping of single photons using quantum dots. Nat. Commun. 9\, 115 (2018). LAST-MODIFIED:20181113T131635Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200310T171500Z DTEND:20200310T181500Z DTSTAMP:20260828T094430Z UID:1jluv8i3k2cfon0gi29m9ebn1c@google.com CREATED:20200122T140444Z LAST-MODIFIED:20200302T151756Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181102T170000Z DTEND:20181102T203000Z DTSTAMP:20260828T094430Z UID:4f0b3naouenpqnhkvg3cojc0mr@google.com CREATED:20181031T125145Z DESCRIPTION:Speaker Name: Kyle Parfrey\, Gareth Roberg-Clark\, Nathan Roth\ , Geoff Ryan\nSpeaker Institution : NASA-GSFC and UMD\nNotes: Lunch will be served at 1:00 outside ATL 2400. Talks will begin at 2:00.\n2:00 -- Kyle P arfrey (NASA/GSFC) -- "Black-Hole Jets from Scratch"\n2:30 -- Gareth Roberg -Clark (UMD-Astronomy) -- "Suppression of Electron Thermal Conduction in th e β High Intracluster Medium of Galaxy Clusters"\n3:00 -- SNACK BREAK\n3:30 -- Nathan Roth (UMD-Astronomy) -- "Super-Eddington Accretion in Tidal Disr uption Events"\n4:00 -- Geoff Ryan (UMD-Astronomy) -- "GRB Afterglows From Structured Jets And The Case For GW170817A"\n\nhttps://jsi.astro.umd.edu/up coming-mini-symposium\nFor further information\, please contact Susan Lehr\ , slehr@umd.edu LAST-MODIFIED:20181031T125717Z LOCATION:ATL 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Scientists Jamboree TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191031T150000Z DTEND:20191031T160000Z DTSTAMP:20260828T094430Z UID:1u4qnqs9phunb67oqcg73q1ftn@google.com CREATED:20191024T191904Z DESCRIPTION:Speaker: Jian Liang\, University of Kentucky\n\nTitle: The idea and prospect of calculating hadronic tensor on the lattice\n\nAbstract: We consider a novel approach of calculating the hadronic tensor from lattice QCD which shows bright prospects in studying both inclusive neutrino-nucleo n scattering at low energies and parton physics in the deep inelastic scatt ering (DIS) region. The framework of the approach and the inverse problem e ncountered in the calculation will be discussed. Preliminary numerical resu lts indicate that fine lattice spacings are crucial to our calculation. I w ill also present some of our recent results of nucleon mass and spin decomp osition which shows another way that lattice can help in understanding the nucleon structure. LAST-MODIFIED:20191028T131804Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191101T170000Z DTEND:20191101T180000Z DTSTAMP:20260828T094430Z UID:0ivfe91of337942q4isadthk3b@google.com CREATED:20190905T134044Z DESCRIPTION:Speaker: Dr. Pawel Keblinski\, MSE Professor and Department Hea d Rensselaer Polytechnic Institute\, NY\n\nTitle: Modeling of Heat Flow Acr oss Interfaces\n\nAbstract: An interface between two materials poses a resi stance to the heat flow\, which is addition to the resistance of the bulk o f the material. Consequently\, materials with high density of interfaces\, such as supperlattices\, nanocrytalline materials\, and nanocomposites\, ca n exhibit thermal conduction that is far lower than values characterizing b ulk materials with little or no interfaces. Such thermal conductivity reduc tion can be advantageous\, e.g.\, in the case of thermal barrier coatings o r thermoelectric materials\, or detrimental\, when the objective is to enab le efficient heat dissipation\, as is the case for thermal interface materi als.\n\nIn this presentation\, Dr. Keblinski will discus factors determinin g heat flow across interfaces and the ability of the atomic-level simulatio n and calculation techniques to shed light on the relative role of these fa ctors\, and the relationship between interfacial structure and bonding and interfacial thermal resistance. Furthermore\, he will discuss how the infor mation on individual interfaces can be used in continuum-level simulations and homogenization theories to model thermal conduction of nanocomposite ma terials. Finally a demonstration of how molecular dynamics simulations can significantly contribute to the century old discussion about the relationsh ip between interfacial kinetics and thermodynamic conditions and the rate o f evaporation/condensation at liquid-vapor interfaces will be made. LAST-MODIFIED:20190910T140722Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200211T181500Z DTEND:20200211T191500Z DTSTAMP:20260828T094430Z UID:03ce6q5eqbeam4nhmq35h0b8hq@google.com CREATED:20200122T135454Z LAST-MODIFIED:20200206T134706Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190401T110000 DTEND;TZID=America/New_York:20190401T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190401T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Symmetries and dynamics in a quantum-chaotic system: Eng ineering Hamiltonians and symmetries\n\nSpeaker: Jean-Claude Garreau\, Univ ersity of Lille\n\nAbstract: Symmetries play a central hole in Physics and in particular in quantum-chaotic systems\, where they provide a useful clas sification. In this talk\, I will show how a simple cold-atom system\, the atomic kicked rotor\, allows flexible Hamiltonian engineering with a full c ontrol of time-reversal and parity symmetries. Symmetry break can be experi mentally observed thanks to quantum-interference phenomena like enhanced re turn to the origin\, forward and backward coherent scattering in momentum s pace. This allows one to quantitatively explore the so-called "weak localiz ation regime"\, a precursor to the Anderson localization.\n\nHost- Victor Galitski LAST-MODIFIED:20190321T123510Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170403T110000 DTEND;TZID=America/New_York:20170403T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170403T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Andrea Cavalleri\, Max-Planck-Institut\, Hamburg\nTitl e: Nonlinear TeraHerz Control and Probing of Superconducting Order\nAbstrac t: In this talk\, I will discuss how TeraHerz pulses can be used to study t he interlayer tunneling modes incuprate superconductors. I will discuss the physics of the Josephson plasma and how its excitationwith strong electrom agnetic fields can open up new possibilities for control. I will also discu ss howthese pulses can be used to measure optically silent modes associated with previously inaccessiblehidden orders. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191108T180000Z DTEND:20191108T190000Z DTSTAMP:20260828T094430Z UID:1pj2p3sj09ct2vnjqp735cgt46@google.com CREATED:20190905T134216Z DESCRIPTION:Speaker: Christopher Li\, MSE Professor\, Drexel University\n\n Title: Shape-Symmetry Incommensurate Polymer Crystals\n\nAbstract: Crystall ization is ubiquitous in nature and semicrystalline polymers are of crucial importance in our daily life. Because of their long chain nature\, polymer s crystallize via a complex pathway\, leading to profound metastable states and morphologies. This talk will focus on polymer crystals whose shape is incommensurate with three-dimensional translational symmetry. Examples are helix\, hollow tubes and spheres. Not only can this shape-symmetry incomme nsurateness arise from the intrinsic characteristics of the crystal such as unbalanced chain folding and/or local stress\, it also can be imparted by nanoscale confinement. Both cases will be discussed\, and emphasis will be given to the formation mechanism\, associated properties and possible appli cations of these unique polymer single crystals. LAST-MODIFIED:20190905T134216Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181015T110000 DTEND;TZID=America/New_York:20181015T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181015T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Quantum enhancements in optical imaging and sensing\n\nS peaker: Saikat Guha\, University of Arizona\n\nAbstract: The fundamental li mits of photonic information processing---be it the maximum rate of reliabl e communications\, resolution of an optical imager\, or the computational p ower of an optical computer---are all ultimately governed by the laws of qu antum mechanics. Most conventional systems\, which do not exploit the manif estly quantum properties of light\, are limited to classical (often purport edly fundamental) performance limits that can be far inferior to the quantu m-mandated limits. In this talk\, I will discuss a few simple illustrative problems in active and passive optical imaging and sensing\, where exploiti ng quantum effects\, by using quantum illumination and/or by employing non- standard all-optical pre-detection processing locally at the receiver\, one can yield improved performance over a classical baseline imager that uses the same transmit power and optical bandwidth. I will discuss recent result s indicative of an important role of entangled probes in distributed sensin g problems. Finally\, I will discuss general characteristics of imaging sce narios where quantum improvements can be expected to be had (or not)\, and the respective natures of enhancements in performance. LAST-MODIFIED:20181011T115425Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190305T160000 DTEND;TZID=America/New_York:20190305T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190305T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Surjeet Rajendran\, University of California\, Berkele y\n\nTitle: Quantum Sensors and Dark Matter Detection\n\nAbstract: The last two decades have witnessed rapid developments in quantum sensing\, enablin g precision measurements of time\, acceleration and magnetism. These sensor s seem well suited to dramatically extend current experimental probes of da rk matter. For example\, these techniques can search for light dark matter in the mass range 10^(-22) eV - 1 GeV\, while also being able to probe cer tain kinds of ultra-heavy dark matter in the mass range 10^(18) GeV - 10^( 33) GeV. This broad search for dark matter\, well beyond the well explored WIMP paradigm\, is necessary since observational constraints on the mass o f dark matter allow it to lie anywhere between 10^(-22) eV - 10^(48) GeV\, with a number of theoretically well motivated candidates spanning this vast range. In this talk\, I will discuss these experimental methods and highl ight recent experimental progress in their implementation. In addition\, I will also touch on their potential application to direct laboratory searche s of dark energy. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190314T123000 DTEND;TZID=America/New_York:20190314T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190314T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Reaction fronts and swimming organisms in laminar flows: manifolds and barriers\nSpeaker: Tom Solomon\nBucknell University | Depart ment of Physics\n\nAbstract: We present experiments on the effects of lamin ar flows on the spreading of the excitable Belousov-Zhabotinsky chemical re action and on the motion of swimming bacteria. The results of these experim ents have applications for a wide range of systems including microfluidic c hemical reactors\, cellular-scale processes in biological systems\, and blo oms of phytoplankton in the oceans. To predict the behavior of reaction fro nts\, we adapt tools used to describe chaotic fluid mixing in laminar flows . In particular\, we propose "burning invariant manifolds" (BIMs) that act as one-way barriers that locally block the motion of reaction fronts. These barriers are measured experimentally in a range of vortex-dominated 2- and 3-dimensional fluid flows. A similar theoretical approach predicts "swimmi ng invariant manifolds" (SwIMs) that are one-way barriers the impede the mo tion of microbes in a flow. We are conducting experiments to test the exist ence of SwIMs for both wild-type and smooth swimming Bacillus subtilis in h yperbolic and vortex-dominated fluid flows. LAST-MODIFIED:20190306T112157Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190924T171500Z DTEND:20190924T181500Z DTSTAMP:20260828T094430Z UID:7e79g8tpm39j099bemk1ghs7ur@google.com CREATED:20190910T135218Z LAST-MODIFIED:20190910T135219Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201023T183000Z DTEND:20201023T200000Z DTSTAMP:20260828T094430Z UID:6e3vlksk4rajgj2knrmm7rlfa1@google.com CREATED:20201014T143853Z DESCRIPTION:Email rcawthor@umd.edu for Zoom details

2:30 p m - Dynamical Symmetry Indicators For Periodically Driven Crystals

Speaker: Jiabin Yu

Abstract: Various exotic topol ogical phases of periodically driven (Floquet) systems\, such as
phases with anomalous corner modes\, have been shown to arise from crystalline sy mmetries.
Yet\, a general theory for topological classification of Floq uet crystals is still absent. In this work\,
we propose to topologicall y classify Floquet crystals based on the symmetry data of the
quasi-ene rgy bands and the quotient winding data of the return map. The winding data consist
of the symmetry-representation-dependent U(1) winding numbers along time\, which yield the
quotient winding data after a modulo opera tion. Based on the winding data\, we further define
the dynamical symme try indicator to sufficiently indicate the obstruction to static limits. We
eventually derive the topological classifications and the dynamical sy mmetry indicators for all
spinless and spinful plane groups\, using the mathematical theory for affine monoids. Our theory
is applicable to an y crystalline symmetry group and can be used to predict new anomalous
t opological phases of Floquet crystals.
Reference: Jiabin Yu\, Rui-Xing Zhang\, Zhi-Da Song\, in preparation

3:00 pm - How hard is i t to prepare a Haar-random state?

Speaker: Christopher White

Abstract: On an error-corrected computer (or a classical co mputer!) Clifford gates are easy\,
and non-Clifford gates are hard. Man a is a magic monotone that lower bounds the number of
non-Clifford gate s required to prepare a state. We compute the average mana for Haar-random
states\, and find that for Hilbert space dimension $d Ägg 1$ it falls s hort of an upper bound by a
constant "Page correction". Furthermore\, w e find that almost all states have mana very close to
the average\; thi s allows one to distinguish a Haar distribution from a unitary $t$-design a t high
probability using a single output state (at the cost of an expon ential number of measurements).

3:30 pm - Many-body level st atistics of single-particle quantum chaos

Speaker: Yunxiang Liao

Abstract: Recent years have witnessed a surge of intere st in quantum chaos - a subtle subject
that is difficult to study and e ven to define. One of the diagnostics of quantum chaos is the level
sta tistics. We investigate the many-body level statistics of noninteracting fe rmions populating
levels of a Gaussian unitary ensemble using the rando m matrix theory. We find that the spectral
form factor is not pure Pois son as one would normally expect for an integrable model\, but
possesse s surprisingly rich features including an initial slope\, an exponential ra mp and a
plateau. The exponential ramp reflects the level repulsion bet ween distant many-body levels
stemming from the underlying single-parti cle quantum chaos. We also use the sigma-model
approach\, which is gene ralizable to the interacting case\, to study the same problem\, and find that the exponential ramp originates from the soft mode fluctuations arou nd the saddle points.
Reference: Y. Liao\, A. Vikram and V. Galitski\, arXiv. 2005.08991

4:00 pm - Discussion LAST-MODIFIED:20201014T143854Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190319T160000 DTEND;TZID=America/New_York:20190319T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190319T160000 CREATED:20180727T143919Z LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Physics Colloquium - Spring Break TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190422T203000Z DTEND:20190422T213000Z DTSTAMP:20260828T094430Z UID:3hl16tc4qonj5hr20jdg69sd91@google.com CREATED:20190401T181729Z DESCRIPTION:Title: A STEREO Survey of Earth-directed CMEs

Speaker: Bria n Wood\, Naval Research Lab

Abstract: I will present the results of a STEREO imaging survey of Earth-directed coronal mass ejections (CMEs) per ceived as magnetic clouds (MCs) by the Wind spacecraft from 2008-2012. Out of 48 Wind MCs\, 31 can be definitively connected to CMEs that STEREO can t rack continuously from the Sun to Earth using its heliospheric imaging capa bilities. A full 3-D reconstruction of each CME's morphology and kinematics is performed based on STEREO and SOHO/LASCO imagery\, assuming an underlyi ng flux rope structure for each CME. There are a number of interesting impl ications of the survey for space weather forecasting. For example\, there i s poor agreement between flux rope orientations inferred from imaging and M C orientations inferred from Wind data\, which does not bode well for some ideas for predicting Bz in the future. The kinematics of this sample of eve nts can be used to provide simple prescriptions for CME arrival time predic tion\, with 1-sigma uncertainties ranging from 4.6-11.7 hours depending on the distance from the Sun where a CME's velocity is measured\, and on wheth er that velocity is a leading edge velocity or a velocity along the Sun-Ear th line.

Notes: Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20190401T181729Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201026T200000Z DTEND:20201026T213000Z DTSTAMP:20260828T094430Z UID:6uvihbmurb2r0de5om7pakqs4l@google.com CREATED:20200909T170503Z DESCRIPTION:Speaker: Alannah Hal las\, UBC
Title: Career Speaker Series
Dr. Hallas will be discuss ing \;her path through academia and the challenges of being junior facu lty and setting up a research program. \; \;

The Career Spea ker Series is meant to give advice to junior scientist on what their choice s are\, how life works after grad school\, what scientific careers are out there.

Zoom Link& nbsp\; &\; \; \;Log In Information

Meeting ID: 911 9803 7643 \;

Password:558484 \;

 LAST-MODIFIED:20201023T203439Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar CAREER speaker: Alannah Hallas\, UBC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200831T190000Z DTEND:20200831T200000Z DTSTAMP:20260828T094430Z UID:2cks5diiujh84t87qvb4h0667q@google.com CREATED:20200825T160809Z DESCRIPTION:Seminar to be conducted via zoom.

Speaker: Raman Sundrum \, UMD

Title: “Cosmology and Unification”

Abstract: I will r eview how future measurements of primordial Non-Gaussianities in the CMB\, Large Scale Structure and 21-cm cosmology can probe very heavy particle phy sics\, with masses of order the Hubble scale during inflation\, possibly as high as ~ 10^14 GeV. I will then apply this approach to plausible targets\ , namely our most ambitious gauge-Higgs theories and extra-dimensional theo ries\, such as Orbifold Grand Unification\, “dark” gauge theories\, and the Standard Model itself\, allowing us to probe a variety of spins including the spin-2 Kaluza Klein graviton. I show how the Hierarchy Problem of the S tandard Model becomes an asset in this context\, readily allowing its parti cles to have the requisite Hubble-scale masses during inflation\, via the m echanism of “heavy-lifting”.

Seminar Slides LAST-MODIFIED:20200903T144030Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200219T200000Z DTEND:20200219T210000Z DTSTAMP:20260828T094430Z UID:6krjcphi6or3ab9pc4s32b9kc4rm6bb264oj6bb5ckqmcchi64rj8cr46s@google.com CREATED:20200212T203110Z DESCRIPTION:Speaker Name: Prof. Mark Mirotznik\nSpeaker Institution : Unive rsity of Delaware\, ECE\n\nMultimaterial Additive Manufacturing of Electron ic Devices and Systems\n\nAbstract : While the current AM market has been g rowing rapidly\, it is still built primarily around single material based s ystems. However\, over the last few years we have seen an increase in comme rcially available multi-material AM systems that are much more material agn ostic allowing users to print a wide range of commercial or custom made mat erials using various integrated print modalities. This opens up the possibi lity of fabricating complete electronic systems using a single machine. In this presentation I will discuss recent progress on the use of multi-materi al additive manufacturing (AM) towards the development of novel electronics and electromagnetic devices and systems. This work is divided into four ov erlapping areas of research\; (1) material development of electromagnetical ly functionalized inks\, pastes and polymer filaments for use in multimater ial AM\, (2) 3D printing of spatially graded electromagnetic structures for use as wideband antireflective surfaces and low cost passive beam forming networks\, (3) applications of multimaterial AM towards fabrication of conf ormal radiofrequency electronic systems such as communications and radar fr ont ends and (4) ceramic AM for electronics and sensing applications in ext reme environments.\n\n\n\n*NEW POLICY: All Visitors to LPS must present a p hoto ID for entry to the colloquium*\n\n\nNote: LPS is located at 8050 Gree nmead Drive in College Park. There is parking at LPS and overflow parking a t the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the phone on t he left hand side of the front door to call the receptionist for entry.\nFo r more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20200212T235034Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200319T150000Z DTEND:20200319T160000Z DTSTAMP:20260828T094430Z UID:5r964p883o0h6f7qr34eqffilg@google.com CREATED:20200311T133243Z DESCRIPTION:Speaker: Carols Rios Ocampo\, Postdoctoral Associate\, MIT\n\nT itle: Reconfigurable Photonics: A Phase Change for the Better\n\nAbstract: The integration of Phase-Change Materials (PCMs) to photonic devices such a s integrated circuits\, plasmonic waveguides\, multilayer stacks\, and meta surfaces has enabled a long-sought functionality: nonvolatile reconfigurati on. Reconfigurability enables multiple responses out of a single device or system\, and nonvolatility is key for the device or system to be stable wit h zero-power consumption. This exceptional combination of properties\, whic h are of extreme importance in any photonic technology\, is possible becaus e PCMs (chalcogenides exemplified by Ge-Sb-Te alloys) exhibit large and non volatile optical properties modulation upon a solid-state phase transition. \nIn this talk\, Dr. Ocampo will present the state-of-the-art of this novel \, fast-growing field together with its challenges and potential. He will f ocus on his research combining photonics and phase-change materials to deve lop in-memory computing on integrated photonic architectures\, nonvolatile switching fabrics\, reconfigurable metasurfaces\, bistable displays\, and t unable topological photonics. Additionally\, he will discuss current effort s towards developing application-specific Optical PCMs\, hybrid electro-opt ical scalable architectures\, and pathways to bridge other gaps in the fiel d – which his research aims to tackle. LAST-MODIFIED:20200311T133447Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190213T203000Z DTEND:20190213T213000Z DTSTAMP:20260828T094430Z UID:7808hij968k8oju64te821rk0d@google.com CREATED:20190211T141748Z DESCRIPTION:Title : Turbulent Dynamo in a Collisionless Magnetized Plasma\n \n\nSpeaker Name: Denis St-Onge\, Princeton Plasma Physics Laboratory \n \n Abstract : The Universe is magnetized. While magnetic-field strengths of ju st ~10^{-18} G are required to achieve this both in our Galaxy and in clust ers of galaxies\, observations of Faraday rotation\, Zeeman splitting\, and synchrotron emission all make the case of ubiquitous ~microGauss fields. T hat these systems are not content with hosting weaker fields is surprising\ , at least until one realizes that the energy density of a ~microGauss fiel d is comparable to that of the observed turbulent motions. It is then natur al to attribute the amplification and sustenance of (at least the random co mponent of) the interstellar and intracluster magnetic fields to the fluctu ation (or "turbulent") dynamo. In this talk\, we will explore the various w ays in which plasma microphysics makes magnetic-field amplification in weak ly collisional plasmas by macroscale turbulent motions possible\, with appl ication to the intracluster medium of galaxy clusters. LAST-MODIFIED:20190211T141748Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190415T190000Z DTEND:20190415T203000Z DTSTAMP:20260828T094430Z UID:3g602bo2gmjde773sc5rq2nn8j@google.com CREATED:20190129T144337Z DESCRIPTION:

Jeff Dror\, UC B erkeley



Title: Pulsar timing as a probe of primordial black holes and subhalos

Abstract: Pulsars act as accu rate clocks\, sensitive to gravitational redshift and acceleration induced by transiting clumps of matter. In this talk\, I study the sensitivity of p ulsar timing arrays (PTA) to transiting compact dark matter objects\, focus ing on primordial black holes and subhalos. Such dark matter clumps can res ult in different classes of signals observable in pulsar timing experiments depending on the mass of the object. I will classify the types of signals\ , where they are most important\, and the different search strategies resul ting in possible constraints over a huge mass range\, 10^−12 to 100 solar m asses. Crucially\, PTAs offer the opportunity to probe much less dense obje cts than lensing experiments due to the large effective radius over which s uch objects can be observed with a single pulsar. We project the reach poss ible with current and future pulsar timing experiments\, with sensitivity t o a dark matter sub-component reaching the sub-percent level over significa nt parts of this range with future detectors. LAST-MODIFIED:20190402T202044Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190502T180000Z DTEND:20190502T193000Z DTSTAMP:20260828T094430Z UID:6skpacvprk8iua840dlttuqb37@google.com CREATED:20190130T185907Z DESCRIPTION:Speaker: Sara Haravifard\, Duke University\nTitle: Emergent Phe nomena and Experimental Evidence of Spin Liquid State in Frustrated Quantum Magnets\nAbstract: \nThe interactions that define how spins arrange themse lves in a material play a fundamental role in a wide variety of physical ph enomena. Frustrated quantum magnets are systems for which the exchange inte ractions governing the interacting spins cannot be simultaneously satisfied \, leading to a highly degenerate ground state and exotic states of matter such as Quantum Spin Liquids. In this talk\, I will discuss how chemical do ping\, external pressure and application of magnetic field regulates the un derlying electronic and magnetic interactions in these systems\, ultimately driving the ground state across the phase diagram\, and providing key info rmation to unveil the mystery of emergent Quantum Spin Liquid States. For e xamples\, I will present our recent results for magnetometry\, thermal tran sport\, Xray and neutron scattering studies performed under extreme sample environments on 2D AFM triangular and Shastry-Sutherland systems\, as well as on 3D Breathing Pyrochlore compounds. \nHost: N.Butch\nRefreshments 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20190410T172823Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Sara Haravifard\, Duke University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200228T160000Z DTEND:20200228T170000Z DTSTAMP:20260828T094430Z UID:4qqsdlli234d8u0jufol0rn3pu@google.com CREATED:20200224T131508Z DESCRIPTION:Speaker: Dr. Jan V. Sengers\, Distinguished University Professo r Emeritus\, UMD\, Institiute for Physical Science and Technology and Dept. of Mechanical Engineering\n\nTitle: Nonequilibrium Fluctuating Hydrodynami cs\n\nAbstract: Fluctuating hydrodynamics is based on Onsager’s hypothesis that the regression of thermal fluctuations is governedby the hydrodynamic equations. Fluctuating hydrodynamics has been primarily used to describe th ermal fluctuationsin fluids in thermodynamic equilibrium states. Extension of fluctuating hydrodynamics to fluids in nonequilibrium stateshas revealed that\, in contrast to equilibrium fluctuations\, nonequilibrium fluctuatio ns become gigantic and extend overthe entire system\, even far away from an y hydrodynamic instability. This discovery has led to a variety of experime ntalstudies of nonequilibrium fluctuations that will be reviewed. Most rece ntly\, it has been predicted that these fluctuationswill cause a new type o f fluctuation-induced Casimir force in confined liquid layers\, possibly op ening a new field of nonequilibrium micro-mechanics. LAST-MODIFIED:20200224T131509Z LOCATION:2164 Martin Hall\, DeWalt Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Burgers Program for Fluid Dynammics Fluid Dynamics Reviews Semi nar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201215T181500Z DTEND:20201215T191500Z DTSTAMP:20260828T094430Z UID:423v4vl8mhtvahhvi66vcjcbvf@google.com CREATED:20201207T154053Z LAST-MODIFIED:20201207T154207Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T160000Z DTEND:20181114T173000Z DTSTAMP:20260828T094430Z UID:4o72kkt0siu39sl1egtgdjne3g@google.com CREATED:20180914T160944Z DESCRIPTION:Quantum decoupling via efficient 'classical' operations and the entanglement cost of one-shot quantum protocols\nQuICS Seminar\nSpeaker: \ nAnurag Anshu (University of Waterloo\, IQC)\nTime: \nWednesday\, November 14\, 2018 - 11:00am\nLocation: \nPSC 3150\nWe address the question of effic ient implementation of quantum protocols\, with short depth circuits and sm all additional resource. We introduce two new methods in this direction. Th e first method\, inspired by the technique of classical correlated sampling \, is to unitarily extend a given quantum state into a quantum state unifor m in a subspace. The second method involves two new versions of the convex- split lemma that use exponentially small amount of additional resource in c omparison to the previous quantum version. Using these methods\, we obtain the following results.\nFirst\, we consider the task of quantum decoupling on n qubits. Most previous works achieve decoupling with the aid of a rando m unitary followed by discarding some qubits. The random unitaries can be r eplaced by random quantum circuits or unitary 2 designs of size O(nlogn) an d depth poly(logn). We show that given any choice of basis such as the comp utational basis\, decoupling can be achieved by a unitary that takes basis vectors to basis vectors. Thus\, the circuit acts in a `classical' manner. Our unitary performs addition and multiplication modulo a prime and hence a chieves O(nlogn) circuit size and logarithmic depth.\nNext\, we construct a new one-shot entanglement-assisted protocol for quantum channel coding tha t achieves near-optimal communication through a given channel. The number o f qubits of entanglement used in this protocol is proportional to the numbe r of qubits input to the channel. Previous one-shot works were either near- optimal in communication but required exponentially more entanglement\, or required small amount of entanglement but did not achieve near-optimal comm unication. We also achieve similar exponential improvement in the entanglem ent required for one-shot quantum state redistribution\, while keeping the communication similar to the best known achievable communication. LAST-MODIFIED:20181023T115931Z LOCATION:PSC 3150: QuICS Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 3150: QuICS Seminar-Anurag Anshu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181130T170000Z DTEND:20181130T174500Z DTSTAMP:20260828T094430Z UID:c5h64cr5coom2b9gccqmcb9kc9hjgb9o6pij4bb169i3ioj668o34d9m64@google.com CREATED:20181122T214238Z DESCRIPTION:Title: Nonlinear sigma model approach to many-body quantum chao s: Regularized and unregularized out-of-time-ordered correlator\n\nSpeaker: Yunxiang Liao\, CMTC and JQI\n\nAbstract: In this talk\, I will present ou r recent work where we investigate many-body quantum chaos in an interactin g disordered metal by computing the out-of-time-order correlators (OTOCs). We develop an augmented Keldysh version of Finkel’stein nonlinear sigma mod el to enable the computation of the regularized and unregularized OTOCs. Bo th correlators grow exponentially but with different Lyapunov exponents. Th e result of the regularized exponent is consistent with a previous diagramm atical perturbation study [1]\, and it obeys the Maldacena-Shenker-Stanford bound [2]. By contrast\, the unregularized exponent exceeds the bound whic h was proved for the regularized OTOC. Unlike the regularized exponent whic h originates entirely from the inelastic collisions between particles\, the unregularized exponent contains an extra contribution from virtual process es unrelated to many-body quantum chao\, i.e.\, the elastic scattering of e lectrons off the Friedel oscillations of the charge density. We therefore a rgue that the unregularized exponent is not a reliable measure for many-bod y quantum chaos.\n\n[1] A. A. Patel\, D. Chowdhury\, S. Sachdev\, and B. Sw ingle\, Phys. Rev. X 7\, 031047 (2017).\n\n[2] J. Maldacena\, S. H. Shenker \, and D. Stanford\, J. High Energy Phys. 08 (2016) 106.\n\n[3] Y. Liao and V. Galitski\, Phys. Rev. B 98\, 205124 (2018).\n\nNotes: Lunch served at 1 2:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181122T214406Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190213T160000Z DTEND:20190213T170000Z DTSTAMP:20260828T094430Z UID:4b6ufsmak8m0dpf278jc16p550@google.com CREATED:20190124T135048Z DESCRIPTION:Speaker: Associate Professor Amanda Hummon\, Ohio State Univer sity\n\nTitle: Evaluating Nutrient Restriction as an Approach to Augment Ch emotherapy in Colorectal Cancer\n\nAbstract: The use of short-term fasting is a potential cancer treatment that could be used in tandem with current c ancer regimes to increase their potency. The Hummon lab has determined that simultaneous short-term glucose starvation and treatment with a common ant imalarial drug\, right and left colon cancer cells can be sensitized to che motherapy treatment. We have demonstrated with colon cancer cells that tumo r suppressor proteins are increased in their abundance after treatment with the FDA-approved malaria drug\, chloroquine\, and short-term glucose starv ation for 72 hours. This treatment rendered the cancer cells more susceptib le to chemotherapy. The hypothesis of this treatment is that cancer cells a re particularly dependent on anaerobic respiration and use glucose for meta bolism. When glucose is removed as a food source\, the cells respond by tri ggering a survival process called autophagy. The antimalarial drug chloroqu ine blocks activation of autophagy and thus makes the cancer cells extremel y vulnerable to external stressors\, like glucose reduction and chemotherap y. We demonstrated that this two-pronged approach of glucose deprivation co mbined with autophagy inhibition was extremely effective at sensitizing col on cancer cells to treatments. The next step is to test the approach in mic e\, to determine whether normal cells will respond to the nutrient stress/a utophagy inhibition or whether they will be unaffected. Should this multi-p ronged approach increase chemotherapeutic efficacy in mice\, then we will p roceed with clinical trials involving glucose restriction and autophagy inh ibition prior to chemotherapy. LAST-MODIFIED:20190129T134950Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190506T180000Z DTEND:20190506T191500Z DTSTAMP:20260828T094430Z UID:36tsb0goe0qcu9t3ub53os87je@google.com CREATED:20190206T163509Z DESCRIPTION:Title: Higher Order Topological Phases: Quadrupoles\, Meta-m aterials\, and Beyond

Speaker: Taylor Hughes (UIUC)

Abstr act: In this talk we present a new class of phases of matter called higher- order topological phases. Such systems exhibit gapped boundaries that are t hemselves lower-dimensional topological phases. Furthermore\, they manifest topologically protected states at intersections between multiple surfaces. These states can\, e.g.\, carry fractional charge\, or be chiral propagati ng modes. We show that some of the simplest examples of these phases are co nnected to materials with quantized electric quadrupole moments\, and illus trate how they can be realized in a variety of meta-material systems. We wi ll also review the first experimental evidence for these phases in meta-mat erial contexts. To characterize these new insulating phases of matter\, we introduce a new type of invariant that had been previously overlooked\, an d we show how these invariants can predict a collection of new phenomena.
Host: Tom Iadecola

Condensed Matter Theory Center website:
htt p://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190429T134825Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201111T160000Z DTEND:20201111T170000Z DTSTAMP:20260828T094430Z UID:5cbh2qg4h4sj06355d1gk3la1o@google.com CREATED:20200923T162348Z DESCRIPTION:Speaker: Tiwary Group

Title: Literature Seminar for Ziyu e (Connor) Zou

Abstract: TBA

ZOOM: \;https://umd.zoom.us/j/97963692312?pwd=cGhMYU9FTXhPMTFjbUMwM VhzMTltQT09 LAST-MODIFIED:20200930T161808Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190129T181500Z DTEND:20190129T191500Z DTSTAMP:20260828T094430Z UID:3f4uuh1hq0g1s87ngaolv04c4h@google.com CREATED:20190124T133551Z LAST-MODIFIED:20190124T134734Z LOCATION:IPST Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar-NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190218T200000Z DTEND:20190218T213000Z DTSTAMP:20260828T094430Z UID:5qb7rmrsnaonn4iojol998apu2@google.com CREATED:20190128T172835Z DESCRIPTION:
Slides

Tommi Tenkanen\, JHU

Title: The Dawn of FIMP Dark Mat ter Abstract: I will present an overview of scenarios where the observed Da rk Matter (DM) abundance consists of Feebly Interacting Massive Particles ( FIMPs)\, produced non-thermally by the so-called 'freeze-in' mechanism. In contrast to the usual freeze-out scenario\, frozen-in FIMP DM interacts ver y weakly with particles in the visible Standard Model sector and never atta ined thermal equilibrium with them in the early Universe. This makes frozen -in DM very difficult but not impossible to test. LAST-MODIFIED:20190311T173259Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191118T110000 DTEND;TZID=America/New_York:20191118T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191118T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Raman dressing of BECs: from modified dispersions to nov el hydrodynamics and phases of matter\n\nSpeaker: Peter Engels\, WSU\n\nAbs tract: Raman dressed Bose-Einstein condensates (BECs) are a very rich syst em for the investigation of novel hydrodynamics and unusual phases of matte r. In this talk\, I will discuss recent and ongoing experiments at Washingt on State University in which we investigate the peculiar properties that re sult from a coupling of motional and internal (pseudo-spin) degrees of free dom afforded by the Raman dressing. As a first example\, we investigate a system comprised of a Raman-dressed BEC and a matching optical lattice that leads to a coupling between the two minima of the lowest dispersion band. In this way\, a stripe phase can be generated that is reminiscent of a supe rsolid\, a peculiar state of matter that has been\, and continues to be\, t he focus of recent experimental scrutiny. Furthermore\, we have also develo ped a range of experimental tools to excite and probe dynamics in such syst ems from the linear to the nonlinear regime. For example\, by sweeping a ba rrier through a Raman-dressed BEC\, we have demonstrated a unidirectional s pin switch that provides an interesting new paradigm for possible spintroni cs related applications.\n\nI will highlight the current status and future direction of these experiments LAST-MODIFIED:20191104T134835Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190426T170000Z DTEND:20190426T180000Z DTSTAMP:20260828T094430Z UID:7ld1gsloegrhs2smmvr383i5gl@google.com CREATED:20190124T142911Z DESCRIPTION:Speaker: Daniel P. Cole\, U.S. Army Research Laboratory

Title: Interfacial Mechanical Behavior of Advanced Composites and Structure

Abstract: The Vehicle Technology Directorate at the US Army Research Laboratory is investigating a variety of advanced materials for fu ture Army vehicles\, including lightweight and damage tolerant/adaptive com posites\, additively manufactured structures\, and multifunctional structur al energy storage materials. An underlying theme with many of these researc h projects is the critical role of interfaces\, which may manifest at the n anometer to millimeter length scale depending on the composite or structure . Currently\, a lack of fundamental understanding of how to experimentally characterize and simulate interface behavior limits practical implementatio n of these promising material systems. This talk will review recent researc h at the Army Research Laboratory concerning mechanical and electromechanic al interface behavior\, while discussing applications to a few material sys tems of interest to the Army\, including fiber/matrix interphases\, 3-D pri nted welds\, and nanocarbon-based composites. In addition\, this talk will cover an overview of the Mechanical Behavior of Materials Program at the US Army Research Office (ARO). This overview will include insights into worki ng with ARO\, approaching Program Managers\, and various funding mechanisms . \; LAST-MODIFIED:20190402T141105Z LOCATION:2110 Chemical & Biomolecular Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191122T170000Z DTEND:20191122T173000Z DTSTAMP:20260828T094430Z UID:6lgr109n90cpq5393i5lpq6o4i@google.com CREATED:20191113T180111Z DESCRIPTION:*Please note the new time and location*\n\nTitle: Tunable quant um interference using a topological source of indistinguishable photon pair s \n\nSpeaker: Venkata Vikram Orre\n\nFriday 22 November\, 12-12:30pm\n(pi zza and drinks served 10 min. before talk)\n\nLocation: 2324 Atlantic Build ing\n\nAbstract: Indistinguishable photon pairs and their quantum interfere nce is a fundamental resource enabling many quantum applications such as qu antum teleportation\, quantum metrology\, quantum communications and quantu m computing. There is a growing need to generate these photon sources on-ch ip to create the next-generation integrated nano-photonic devices. Photon p airs are commonly produced using spontaneous parametric down-conversion (SP DC) or spontaneous-four wave mixing(SFWM). On-chip photon pairs produced th rough SFWM have an added advantage over SPDC of being easily scalable and n ot requiring special materials. However\, disorder during fabrication proce sses changes the device functionality and makes the scalability of these d evices ineffective. One prominent solution to the problem is to use topolog ical edge states which were shown to be robust against fabrication-induced disorder.\n\nIn this work\, we report the generation of indistinguishable p hoton pairs in an anomalous quantum Hall device using a dual-pump SFWM (DP- SFWM) process. We show that the linear dispersion of the edge states provid es an efficient phase matching condition for DP-SFWM and produces maximum o utput spectral correlations in the edge band. The linear dispersion also ma ke it possible to tune the bandwidth of the generated photons by changing t he pump frequencies. Finally\, we verify the indistinguishably of photons u sing Hong-Ou-Mandel (HOM) experiment and show that the generated photons ar e energy time-entangled. This work allows exploration of a robust tunable q uantum sources on-chip which would be helpful in many applications of quant um information. LAST-MODIFIED:20191119T123143Z LOCATION:Atlantic Building 2324 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181129T190000Z DTEND:20181129T203000Z DTSTAMP:20260828T094430Z UID:1fggsasggbtlq6845077dd9ahu@google.com CREATED:20180823T193857Z DESCRIPTION:Title: Materials Informatics tools and topological organics\n\n Speaker: Alexander Balatsky\, Nordita and University of Connecticut \n\n\nA bstract: \n\nHigh-throughput calculations using first-principles methods i n combination with approaches from data mining and machine learning fields have enabled a new stage in accelerated discovery of functional materials w ith special properties. I will present newly developed Organic Materials Da tabase (OMDB\, https://omdb.diracmaterials.org/) and discuss use of these m ethods. Our platform hosts thousands of electronic structures of synthesize d organic materials [1] and is a useful tool in searching for novel materia ls. I will also discuss the implemented first graphical pattern search tool which is capable of finding user-specified graphical patterns in a collect ion of thousands of band structures in the online regime. Its software impl ementation is designed to match the constraints of web applications in term s of fast execution time and low memory usage. Our work is a step towards a new way to search for novel functional materials characterized by a specif ic pattern in their electronic structure\, for example\, Dirac materials\, topological insulators\, new semimetals with low-energy excitations behavin g as exotic quasi-particles and many others[2\,3]. Going beyond the search tools I will discuss ongoing efforts in using machine learning tools to pre dict the bands gaps in materials [4]. \n \n[1] Stanislav S. Borysov et.al\ , (2017)\, PLoS ONE 12(2): e0171501.doi:10.137 https://doi.org/10.1371/jour nal.pone.0171501 \n[2] R. M. Geilhufe\, S. S. Borysov\, D. Kalpakchi\, A.V . Balatsky\, Physical Review Materials 2:2\, (2018): 024802 \n[3] R. Matthi as Geilhufe\, Bart Olsthoorn\, Alfredo D. Ferella\, Timo Koski\, Felix Kahl hoefer\, Jan Conrad and Alexander V. Balatsky\, Phys. Status Solidi RRL\, 2 018\, 12\, 1800293 \n[4] S. Borysov et al\, npj Computational Materials vol ume 4\, Article number: 46 (2018)\n\nHost: Paglione\n\nRefreshments Served at 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181106T151748Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Alexander Balatsky\, Nordita TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170306T110000 DTEND;TZID=America/New_York:20170306T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170306T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Ignacio Cirac\n\nSpeaker Institution: Max-Planck-Insti tut\, Garching\n\nTitle: Quantum optics with emitters in waveguides\n\nAbst ract: Recent progress in nano-fabrication and atomic physics allowes us to couple \natoms (or other emitters) to structured waveguides. In this talk I will report on \ndifferent opportunities that are opened up by those syste ms\, including the observation \nof many-photon bound states\, the preparat ion of Fock states\, or the simulation of long-range spin interacting model s. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200203T110000 DTEND;TZID=America/New_York:20200203T120000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com RECURRENCE-ID;TZID=America/New_York:20200203T110000 CREATED:20191125T175528Z DESCRIPTION:Title: Prethermalization and thermalization in isolated quantum systems\n\nSpeaker: Marcos Rigol\, Penn State\n\nAbstract: Prethermalizati on has been extensively studied in systems close to\nintegrability. We disc uss a more general\, yet conceptually simpler\, setup for\nthis phenomenon. We consider a--possibly nonintegrable--reference dynamics\,\nweakly pertur bed so that the perturbation breaks at least one conservation\nlaw. We argu e then that the evolution of the system proceeds via intermediate\n(general ized) equilibrium states of the reference dynamics. The motion on the\nmani fold of equilibrium states is governed by an autonomous equation\, flowing\ ntowards global equilibrium in a time of order 1/g^2\, where g is the\npert urbation strength. We also describe the leading correction to the time-\nde pendent reference equilibrium state\, which is\, in general\, of order g [1 ].\nThe theory is well confirmed in numerical calculations of model Hamilto nians\nin the context of quantum quenches [1] and driven systems [2]\, for which we\nuse numerical linked cluster expansions and full exact diagonaliz ation. For\nthe driven systems\, we discuss the relationship between heatin g rates and\,\nwithin the eigenstate thermalization hypothesis\, the smooth function that\ncharacterizes the off-diagonal matrix elements of the drive operator in the\neigenbasis of the static Hamiltonian. We show that such a function\, in\nnonintegrable and (remarkably) integrable Hamiltonians [3]\ , can be probed\nexperimentally by studying heating rates as functions of t he frequency of the\ndrive.\n\nReferences:\n[1] K. Mallayya\, MR\, and W. D e Roeck\, Prethermalization and\nThermalization in Isolated Quantum Systems \, Phys. Rev. X 9\, 021027 (2019).\n[2] K. Mallayya and MR\, Heating Rates in Periodically Driven Strongly\nInteracting Quantum Many-Body Systems\, Ph ys. Rev. Lett. 123\, 240603 (2019).\n[3] T. LeBlond\, K. Mallayya\, L. Vidm ar\, and MR\, Entanglement and matrix\nelements of observables in interacti ng integrable systems\, Phys. Rev. E 100\,\n062134 (2019).\n\nHost: Jay Sau LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190529T180000Z DTEND:20190529T193000Z DTSTAMP:20260828T094430Z UID:576ngin2n1fudjilj8lic1ikp7@google.com CREATED:20190430T134253Z DESCRIPTION:Phuc Nguyen\, UMD\n\nTitle: Diffeomorphism invariance and the b lack hole information paradox\n\nAbstract: We argue that the resolution to the black hole information paradox lies in a proper accounting of the impli cations of diffeomorphism invariance for the Hilbert space and observables of quantum gravity. The setting of asymptotically Anti-de Sitter spacetime is adopted for most of the paper\, but in the framework of canonical quantu m gravity\, without invoking AdS/CFT duality. We present Marolf's argument that boundary unitarity is a consequence of diffeomorphism invariance\, and show that its failure to apply in the classical limit results from a lack of analyticity that has no quantum counterpart. We argue that boundary unit arity leads to a {\\it boundary information paradox}\, which generalizes th e black hole information paradox and arises in virtually any scattering pro cess. We propose a resolution that involves operators of the boundary algeb ra that redundantly encode information about physics in the bulk\, and expl ain why such redundancy need not violate the algebraic no cloning theorem. We also argue that the infaller paradox\, which has motivated the firewall hypothesis for black hole horizons\, is ill-posed in quantum gravity\, beca use it ignores essential aspects of the nature of the Hilbert space and obs ervables in quantum gravity. LAST-MODIFIED:20190528T190305Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190926T150000Z DTEND:20190926T163000Z DTSTAMP:20260828T094430Z UID:4695nk4347iqe2lnl08q7kotjn@google.com CREATED:20190815T180649Z DESCRIPTION:Speaker: Jesse Stryker\, University of Washington\n\nTitle: SU( 2) gauge theory on digital quantum computers\n\nAbstract: I will discuss re cent work on the quantum simulation of SU(2) gauge theory on IBM's Tokyo de vice. This was done by constructing gauge-invariant states\, computing mat rix elements of the Hamiltonian in this basis\, and constructing a time evo lution operator accurate on that basis that profitably differs from convent ional approaches on the disallowed states. Using error mitigation\, extrac ted electric energy measurements from hardware were found to behave as expe cted for one Trotter-Suzuki step. LAST-MODIFIED:20190911T193049Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201207T210000Z DTEND:20201207T220000Z DTSTAMP:20260828T094430Z UID:2rv2r3117i35siq98gh5bi28pm@google.com CREATED:20200922T143108Z DESCRIPTION:
Biophysics \;Seminar
Monday\, \;Decemb er 7\, \;2020


Speaker: \;  \; &nbs p\;  \;  \;  \;Ugur Cetiner\, Harvard Medical School&nbs p\;
 \;
Location: \; \;  \;  \;  \; &n bsp\;Zoom Meeting (https://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09)

Time:&n bsp\;  \;  \;  \;  \;  \;  \;  \;  \;4PM
 \;
Title: \; \; \;  \;  \;   \;  \;  \;  \;  \;The Role of Energy Expenditure in Biological Discrimination< /a> \;

Abstract:

Life is inherently away fr om thermodynamic equilibrium. However\, analysis of non-equilibrium steady states has been hampered by combinatorial complexity and lack of thermodyna mic interpretation. Here\, we exploit a graph-theoretic representation of M arkov processes to reformulate non-equilibrium steady state probabilities i n a way that makes their descriptions independent of system size and gives them thermodynamic meaning. We demonstrate the power of this reformulation by greatly extending Hopfield’s classic study of kinetic proofreading\, rev ealing how energy dissipation allows collective synergy in biological discr imination. Our results suggest how we can “follow the energy” to unravel th e functional logic of non-equilibrium systems in physics and biology. \ ; \; LAST-MODIFIED:20201130T175313Z LOCATION:Online seminar -- Zoom meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181019T170000Z DTEND:20181019T180000Z DTSTAMP:20260828T094430Z UID:4fr4on7s9hb1u8iobqdunedcnl@google.com CREATED:20180905T152751Z DESCRIPTION:Speaker: Francesca Serra\, Assistant Professor\, John Hopkin s Dept. of Physics &\; Astronomy

Title: Control of Topolog ical Defects and Particles in Liquid Crystals

Abstract : Soft materials are a promising tool to explore energy landscapes and to s earch for new and tunable optical components. Liquid crystals\, in particul ar\, combine reconfigurability and unique optical properties\, and their or der can be controlled by combining appropriate bounding surfaces and extern al fields. These fluids with long-range orientational order possess elastic energy and can generate topological defects\, which can be used for assemb ly. I will show a few examples of unexpected phenomena generated by the int erplay between confinement\, liquid crystal elasticity and external fields. Metastable configurations can be induced in thin capillaries filled with l iquid crystals. Also\, the motion of micro-particles floating in nematic li quid crystals can be precisely directed by small deformations of the bounda ries\, which can also manipulate the defects near the particles. Finally\, the interplay between confinement and electric field leads to the productio n of highly controlled\, large-scale arrays of topological defects that wor k as tunable optical gratings. LAST-MODIFIED:20181003T130231Z LOCATION:2108 Chem/Nuclear Engr Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200909T193000Z DTEND:20200909T203000Z DTSTAMP:20260828T094430Z UID:0vamv4ar3uoedqs7pic78cs8ji@google.com CREATED:20200827T184852Z DESCRIPTION:
Title : Trigger Shy? An Observational Study of a "Rosetta-S tone" Solar Eruption

Speaker Name: Emily Mason

Speaker Instit ution : Goddard Space Flight Center

Contact:
Marc Swisdak
swisdak@umd.edu \; \; LAST-MODIFIED:20200901T135339Z LOCATION:For login coordinates\, contact Marc Swisdak: swisdak@umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170508T110000 DTEND;TZID=America/New_York:20170508T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170508T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Tilman Esslinger\, ETH Zürich\n\nTitle: Transport with out Charge\n\nAbstract: The observations of quantized steps in electric con ductance have provided important insights into the physics of mesoscopic sy stems and allowed for the development of quantum electronic devices. Whilst quantized conductance should not rely on the presence of electric charges\ , it had not been observed for neutral\, massive particles. I will report o n recent experiments in which we observed quantized conductance in the tran sport of neutral atoms [1]. We used high-resolution imaging to shape the po tential of a quantum point contact and a quantum wire between two reservoir s of quantum degenerate fermionic lithium atoms. I will further report on r ecent findings in spin and particle conductance measurements through a quan tum point contact in a regime of strong atom-atom interactions [2].\n\n\nRe ferences\n\nS. Krinner\, D. Stadler\, D. Husmann\, J.- P. Brantut\, and T. Esslinger\, Nature 517\, 64-67 (2015).\nD. Husmann\, S. Uchino\, S. Krinner \, M. Lebrat\, T. Giamarchi\, T. Esslinger\, and J. - P. Brantut\, Science 350\, 1498-1501 (2015).\n LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201014T200000Z DTEND:20201014T213000Z DTSTAMP:20260828T094430Z UID:4bgo6238s01nf9398jv5f2upmp@google.com CREATED:20201009T152246Z DESCRIPTION:Title : "LHCb Upgrades and Prospects for charged Lepton Univers ality Violation"

Speaker Name: Manuel Franco Sevilla
Speaker Inst itution: University of Maryland

https://umd.zoom.us/j/9 1943906688?pwd=b2FEK2wwTldPNGNWRURQS2R5UW5Mdz09

Me eting ID: 919 4390 6688 \;  \;Passcode: 214353 \; \;

Abstract : Since 2010\, the LHCb experiment at CERN has been accumulating 1-2 𝑓𝑏−1 of 7-13 TeV pp collision data every year. This b- and c-hadron r ich data sample\, together with the detector’s excellent performance\, has allowed LHCb to carry out world leading measurements in the field of flavor physics. Many of these results\, however\, will benefit from significantly larger data samples\, and that is what LHCb's Upgrades I and II aim to ach ieve. Three completely new trackers as well as a more powerful readout elec tronics will be installed. As a result\, the experiment will be able to rea d out the collision data at the unprecedented rate of 30 MHz\, with all tri gger decisions performed at the software level. The data collection will in crease to about 8.3 𝑓𝑏−1 a year after Upgrade I and to about 50 𝑓𝑏−1 af ter Upgrade II. In this talk I will describe these upgrades with emphasis o n the Vertex Locator or VELO (a technological marvel) and the Upstream Trac ker or UT (which has important contributions from UMD). I will then describ e how these upgrades will help us finally make sense of the long standing a nomalies suggesting Lepton Universality Violation in charged currents.  \; \;

Contact Name: Sarah W Megonigal
Your E-Mail: \;smegonig@umd.edu \; \; LAST-MODIFIED:20201009T183223Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181025T170000Z DTEND:20181025T183000Z DTSTAMP:20260828T094430Z UID:1ljkf23rhb310i133nb3bgetkj@google.com CREATED:20180828T143530Z DESCRIPTION:Title: 3 HADRONS IN (IN-) FINITE VOLUME\n\nSpeaker: Maxim Mai\, George Washington University\n\nAbstract: Many contemporary puzzles of had ron physics are related to\nsystems with three hadrons\, and different appr oaches exist to this end.\nIn my talk\, I will show how a fully relativisti c unitary 3-body scattering amplitude \ncan be derived\, when parameterizin g the 2-body sub-channel amplitudes by a\ntower of isobars.\n\nThe only ab- initio access to the properties of strongly interacting systems are \nprovi ded by the virtues of Lattice QCD. The relation between the finite-volume \ nspectra obtained in such calculations and infinite-volume ones is called q uantization condition.\nI will show in the second part of my talk how a rel ativistic 3-body quantization condition\ncan be derived from the above 3-bo dy scattering amplitude. \nI will conclude by demonstrating the recent appl ication of the latter to the finite-volume \nspectrum of pi-pi-pi system wi th maximal isospin from the NPLQCD collaboration. LAST-MODIFIED:20181016T131739Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190905T150000Z DTEND:20190905T163000Z DTSTAMP:20260828T094430Z UID:622f4o7h1gat765tpj9lusptte@google.com CREATED:20190815T180417Z DESCRIPTION:Speaker: Indrakshi Raychowdhury\, UMD\n\nTitle: Towards Quantum Simulating Non-abelian Lattice Gauge Theory\n\n\nAbstract: In this talk\, we discuss a complete and efficient formulation for SU(2) lattice gauge the ory with fundamental matter and establish this to be a practical framework for digital as well as analog quantum simulation. Key features of this fr amework include a gauge-invariant and readily-digitized basis\, together w ith a representation of the Hamiltonian in terms of simple ladder operators . We show that within this formulation\, the physical sector of the non-Abe lian lattice gauge theories are made equivalent to Abelian theories. Utiliz ing this feature\, we can directly generalize the simulation techniques\, already present for Schwinger model towards constructing proposals for simu lating non-Abelian lattice gauge theories. LAST-MODIFIED:20190829T141914Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181029T190000Z DTEND:20181029T203000Z DTSTAMP:20260828T094430Z UID:559kbs8v6ulgssu8vea78fe9me@google.com CREATED:20180905T143000Z DESCRIPTION:\nTitle: Axions From Strings: the Attractive Solution\n\nSpeake r: Marco Gorghetto\, International Centre for Theoretical Physics/SISSA\n\n Abstract: The axion solution to the strong CP problem also provides a natur al\ndark matter candidate. If the PQ symmetry has ever been restored after\ ninflation\, topological defects of the axion field would have formed and\n produced relic axions\, whose abundance is in principle calculable. Using\n numerical simulations I will present a detailed study of the evolution of\n axion strings and the resulting spectrum of axion produced. The features fo und\nare important for a correct estimate of the total DM abundance.\n\nRef s: 1806.04677 \nand also\nhttps://www.youtube.com/watch?v=DbvM7emtodo LAST-MODIFIED:20181016T131557Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190417T200000Z DTEND:20190417T213000Z DTSTAMP:20260828T094430Z UID:7sv35dmmggtekn4a3hc1obquv7@google.com CREATED:20190412T171451Z DESCRIPTION:Title : "Dark Matter Searches with Bubble Chambers"\n\nSpeaker: Russell Neilson\, Drexel University\n\nAbstract : The PICO Collaboration u ses fluorocarbon filled bubble chambers to search for WIMP dark matter. Int rinsic rejection of minimum-ionizing electron-recoil backgrounds\, and acou stic discrimination of alpha-decay events\, allow for near background free operation at the SNOLAB underground laboratory. I will discuss recent resul ts from the PICO-60 experiment\, which was filled with 52 kg of superheated C$_3$F$_8$\, as well as future PICO experiments: PICO-40L\, currently prep aring to begin operations\, and PICO-500\, an order of magnitude larger pro ject to increase the WIMP search exposure to the ton-year scale. I will als o discuss exciting R&D efforts into liquid-noble filled bubble chambers for WIMP searches and neutrino physics. LAST-MODIFIED:20190412T171451Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190516T163000Z DTEND:20190516T173000Z DTSTAMP:20260828T094430Z UID:4214c3k4nmf5uh87d0ri1e1bjp@google.com CREATED:20190318T202720Z DESCRIPTION:Title: New methods for fractal and Wada basins\nSpeaker: Álvar Daza\nKing Juan Carlos University | Applied Physics\n\nAbstract: In dynamic al systems\, basins of attraction are defined as the set of initial conditi ons leading to a particular asymptotic behavior. Nonlinear systems often gi ve rise to fractal boundaries in phase space\, hindering predictability. A special case of fractal boundaries appears when a single boundary separates three or more different basins of attraction. Then we say that the set of basins has the Wada property and initial conditions near that boundary beco me particularly unpredictable. Although it could seem an odd situation\, ma ny physical systems showing this topological property appear in the literat ure. In this talk\, I will review some basic aspects on Wada basins\, and t hen I will describe some new recently developed methods to ascertain the Wa da property in dynamical systems. These new methods present important advan tages with respect to the previously known method\, provide new perspective s on the Wada property and broaden the situations where it can be verified. Also\, I will show how the novel concept of basin entropy helps us quantif y the unpredictability associated to different basins of attraction and its relation with Wada basins. LAST-MODIFIED:20190326T193850Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191028T203000Z DTEND:20191028T213000Z DTSTAMP:20260828T094430Z UID:7oc7lu14gh1qiuielhbn87disp@google.com CREATED:20191009T205019Z DESCRIPTION:Title: New Advancements in our Understanding of AGN Feedback fr om the VLA and Beyond\n\nSpeaker: Kristina Nyland\, Naval Research Lab\n\nA bstract: As the most energetic\, long-lived objects in the Universe\, activ e galactic nuclei (AGN) are capable of dramatically altering their surround ings through the process of AGN feedback. AGN feedback is believed to influ ence galaxy evolution through the regulation of star formation rates and ef ficiencies. The prevailing belief is that AGN feedback shapes galaxies thro ugh powerful quasar winds at high redshift and the regulation of cooling fl ows by classical radio galaxies at low redshift\, and is thus limited in sc ope to the most luminous quasars and radio galaxies. However\, recent evide nce suggests that AGN feedback may operate under a much broader range of co nditions. In particular\, a key missing element in our understanding of rad io jet-driven feedback and its importance to galaxy evolution is how it ope rates on (sub-)kpc scales in gas-rich galaxies. In this talk\, I describe r ecent advancements in our evolving understanding of the cosmic importance o f radio jets as well as future prospects with instruments such as the next- generation Very Large Array.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30P M LAST-MODIFIED:20191009T205019Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191115T183000Z DTEND:20191115T200000Z DTSTAMP:20260828T094430Z UID:6pg217otng9tfsq84mvtvprpp0@google.com CREATED:20191113T191008Z DESCRIPTION:Yong Zhao\, MIT\n\nTitle: Determining the nonperturbative Colli ns-Soper kernel from lattice QCD\n\nAbstract: The transverse momentum depen dent parton distribution functions (TMDPDFs) measure the transverse momentu m of partons in a fast moving hadron. The energy evolution of TMDPDFs is gi ven by the Collins-Soper (CS) anomalous dimension\, or the CS kernel\, whic h is essential to the fitting of TMDPDFs from global cross section data at different energies. At small transverse momentum\, the CS kernel is nonpert urbative and can only been determined from global fitting or first principl e calculations. In this talk\, I will show that the CS kernel can be calcul ated from lattice QCD using the large-momentum effective theory\, a systema tic approach to extract light-cone parton physics on the lattice. Our preli minary results show that it is promising to achieve precision calculation w ith currently available computing resources\, which has the potential to be used in the future global fitting of TMDPDFs. LAST-MODIFIED:20191113T191008Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201207T210000Z DTEND:20201207T220000Z DTSTAMP:20260828T094430Z UID:4qunhvh5hnc77up9hu112br3gp@google.com CREATED:20201119T160010Z DESCRIPTION:Speaker: \;Dr. Todd Brintlinger\, \;U.S. Nav al Research Laboratory \; \;
Title: Career Speaker Series: \ ;A Career in Physics at a Government Laboratory

Physics degree ho lders are highly employable in both the private and public sectors. However \, students and early career scientists are often unaware of the types of c areer paths available to them. This talk will provide data on the number of physics degree holders and where they typically find employment\, give exa mples of common career paths\, and provide guidance on\, and highlight care er resources useful for\, exploring options and searching for jobs. \; While focusing specifically on physics\, much of the same information is ap plicable for related disciplines\, especially materials science. \; I w ill describe my own career path\, starting here at the University of Maryla nd and continuing at the U.S. Naval Research Laboratory\, the corporate lab oratory for the U.S. Navy\, where I have used physics to study systems span ning many length and energy scales in the Materials Science and Technology Division.

DISTRIBUTION A: \; Approved for public release\, di stribution is unlimited.


Zoom Link \; &\; \; \;Log In Information

Meeting ID: 911 9803 7643 \;

Password: 558484 \;

LAST-MODIFIED:20201203T191109Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar CAREER Speaker: Dr. Todd Brintlinger\, U.S. Nava l Research Laboratory TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200211T193000Z DTEND:20200211T210000Z DTSTAMP:20260828T094430Z UID:5pkks35pqvb9gtperapmh82q2g@google.com CREATED:20200130T162210Z DESCRIPTION:\nSpeaker: Eugene Demler (Harvard)\n\nTitle: Nonlinear optics w ith collective excitations and photoinduced superconductivity\n\nAbstract: This talk will review the recent progress in theoretical modeling of nonequ ilibrium dynamics of electron-phonon systems.There will be an emphasis on u nderstanding experimental observations of photoinduced superconductivity.\n \nHost: Jay Sau LAST-MODIFIED:20200202T210010Z LOCATION:ATL 4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200923T150000Z DTEND:20200923T161500Z DTSTAMP:20260828T094430Z UID:509hg3qjke73j3kqm5iep67cre@google.com CREATED:20200915T162740Z DESCRIPTION:Speaker: Giulia Galli\, University of Chicago\, \;https://galligroup.uchica go.edu/People/galli.php

Title: Light-Activated Matter: from Ener gy to Quantum Information Science

Abstract: We discuss strategies\, based on first principles\, quantum mechanical calculations\, to understand and predict light-activated processes in heterogenous materials. We aim to tackle two outstanding challenges: designing sustainable processes to effi ciently capture and store solar energy (e.g. by water photocatalysis)\, and inventing materials (e.g. starting from defective semiconductors) to build radically novel sensors and computers\, to move in earnest into the quantu m information age.

ZOOM: \;https://umd.zoom.us/j/951444227 26?pwd=TDhPVWF4dVB4aUdyMzh3V3NvcWRKQT09 LAST-MODIFIED:20200917T153035Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181106T181500Z DTEND:20181106T191500Z DTSTAMP:20260828T094430Z UID:4uskvindqr2qp8ml8tolult42h@google.com CREATED:20180905T132722Z DESCRIPTION:Speaker: Eugenia Kalnay\, Distinguish University Professor\, UMCP\, Atmospheric and Oceanic Science

Title: Can Large-Scal e Solar and Wind Farms Create A Significant Climate Change?

< /b>Abstract: Based on the paper published on 7 September 2018 in Sci ence

Wind and solar farms offer a major pathway to clean\, renewabl e energy. However\, these farms would change the land surface properties\, and\, hence may lead to unintended climate changes. We used a climate model with dynamic vegetation and show that large-scale installations of wind an d solar farms lead to a local temperature increase\, and more than a two-fo ld precipitation increase\, especially in the Sahel\, through increased sur face friction and decreased albedo. The resulting increase in vegetation fu rther increases precipitation\, creating a positive albedo-precipitation-ve getation that contributes ~80% of the precipitation increase for the wind f arms. This local enhancement is scale dependent and is particular to the Sa hara\, with small impacts in other deserts. The wind and solar panels would generate ~3TW and 79TW of electric power/year respectively\, compared with the total energy consumption of 18 TW/year\, so that they would allow addr essing
the problem of climate change. LAST-MODIFIED:20181105T132719Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201006T180000Z DTEND:20201006T210000Z DTSTAMP:20260828T094430Z UID:4g1vq39ga1q9sh83pjl4ionbvk@google.com CREATED:20200922T141544Z DESCRIPTION:

Biophysics Symposium on "Biological Active Matter"

 \;

Presented by the \;Biophysics Program:

https://ipst.umd.edu/gra duate-programs/biophysics


Please register by&n bsp\;filling out this short form \;to obtain the Z oom information to attend the Symposium.

ht tps://docs.google.com/forms/d/1MF47v642yYB2lR8ro79ZMz6vSwK7KyamH4C4dQKB4Fo/ edit


Tuesday\, October 6th (2 - 5 pm)

  • 2:00 pm: \;Introductory remarks
  • 2:05 - 2:45 pm: \;Meredith Betterton \;(U Colorado) Biophysics of mitotic spindle assembly
  • 2:50 - 3:30 pm: \;Alex Mogilner \;(NYU) Assembl y of mitotic spindle in prometaphase
  • 3:35 - 4:15 pm:& nbsp\;Daniel Reich \;(Johns Hopkins University) Dissecting fat-tailed fluctuations in the cytoskeleton with active micropost arrays
  • 4:20 - 5:00 pm: \;Christoph Schmidt&n bsp\;(Duke University) Mechanosensing in Drosophila: larval chordotonal&nbs p\;organs
  • 5:00 - 5:15 pm: \;Final remarks and inf ormal discussion \;

< b>

Organizers:

< i>Arpita Upadhyaya \; arpitau@umd.edu< /a>

Garegin Papoian \; g papoian@umd.edu

 \;

LAST-MODIFIED:20200929T133137Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Symposium on "Biological Active Matter" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181015T203000Z DTEND:20181015T213000Z DTSTAMP:20260828T094430Z UID:5vnanj961gpd3u63s1o4pcrb6t@google.com CREATED:20181001T173546Z DESCRIPTION:Title: Advanced X-ray Imaging Satellite

Speaker: Richard Mu shotzky\, NASA GSFC and Dept. of Astronomy\, University of Maryland

Abstract: AXIS is a probe-class concept under study for submission to the 2020 Decadal survey. AXIS will extend and enhance the science of high angular re solution x-ray imaging and spectroscopy in the next decade with ~0.3" angul ar resolution over a 7' radius field of view and an order of magnitude more collecting area than Chandra in the 0.3-12 keV band with a cost consistent with a probe.

These capabilities are enabled by new technology x-ray optics utilizing lightweight single-crystal silicon optics with high angular resolution and large collecting area and next generation silicon detectors with small pix els\, to sample the point spread function\, and with high read-out rate to allow timing science and prevent pile-up. We have selected a low earth orbi t to enable rapid target of opportunity response\, similar to Swift\, with a high observing efficiency\, low detector background and long detector li fe.

The combination opens a wide variety of new and exciting science such as: (i) measuring the event horizon scale structure in AGN accretion disks and the spins of supermassive black holes through observations of gra vitationally-microlensed quasars\; (ii) determining AGN and starburst feedb ack in galaxies and galaxy clusters through direct imaging of winds and int eraction of jets and via spatially resolved imaging of galaxies at high-z\; (iii) fueling of AGN by probing the Bondi radius of over 20 nearby galaxie s\; (iv) hierarchical structure formation and the SMBH merger rate through measurement of the occurrence rate of dual AGN and occupation fraction of S MBHs\; (v) advancing SNR physics and galaxy ecology through large detailed samples of SNR in nearby galaxies\; (vi) measuring the Cosmic Web through i ts connection to cluster outskirts\; (vii) a wide variety of time domain sc ience including rapid response to targets of opportunity.

With a nom inal 2028 launch\, AXIS benefits from natural synergies with the ELTs\, LSST\, ALMA\, WFIRST and ATHENA. The AXIS team we lcomes input and feedback from the community in preparation for the 2020 De cadal review.

Notes: Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20181010T235330Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200811T150000Z DTEND:20200811T160000Z DTSTAMP:20260828T094430Z UID:42sc3tjv19ipds3gdlim3j7tbo@google.com CREATED:20200729T194815Z DESCRIPTION:Speaker: \;Dmitry Green \;

Title: \;A superc onducting circuit realization of combinatorial gauge symmetry

Abstra ct: We propose an integrated superconducting circuit design in combination with a general symmetry principle – combinatorial gauge symmetry – to b uild artificial quantum spin liquids that serve as foundation for the const ruction of topological qubits. The superconducting wire arrays exhibit rich features. In the classical limit of large capacitances its ground state co nsists of two superimposed spin liquids\; one is a crystal of small loops c ontaining disordered U(1) degrees of freedom\, and the other is a soup of l oops of all sizes associated to Z_2 topological order. We show that the cla ssical results carry over to the quantum case when fluctuations are gradual ly tuned via the wire capacitances\, yielding Z_2 quantum topological order . In an extreme quantum limit where the capacitances are all small\, we arr ive at an effective quantum spin Hamiltonian that we conjecture would susta in Z_2 quantum topological order with a gap of the order of the Josephson c oupling in the array.


Host Prof. Victor Galitski

Email rcawthor@umd.edu for Zoom details \; LAST-MODIFIED:20200729T194815Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC-QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201215T160000Z DTEND:20201215T170000Z DTSTAMP:20260828T094430Z UID:5801c187poikg8da4g4u24nr7t@google.com CREATED:20201203T173228Z DESCRIPTION:
Speaker: Pablo Jarillo-Herrero \;(MIT)
< b>Title: \;Moiré Magic 3.0
Abstract: \;Moiré sup erlattices have recently emerged as a novel platform where correlated physi cs and superconductivity can be studied with unprecedented tunability. Alth ough correlated effects have been observed in several other moiré systems\,  \;magic-angle twisted bilayer graphene (MATBG) remains the only one wh ere robust \;superconductivity has been reproducibly measured. In this talk I will present a new moir é superconductor\, mirror symmetric \;ma gic-angle twisted trilayer graphene (MATTG) with dramatically richer tunabi lity in electronic structure and superconducting properties. Hall effect an d quantum oscillations measurements as a function of density and electric f ield allow us to determine the system's tunable phase boundaries in the nor mal state. Zero magnetic field resistivity measurements then reveal that th e existence of superconductivity is intimately connected to the broken symm etry phase emerging \;at two carriers per moiré unit cell. Strikingly\, we find that the superconducting phase gets suppressed and bounded at the van Hove singularities (vHs) partially surrounding the broken-symmetry phas e\, which is di cult to reconcile with weak-coupling BCS theory. Moreover\, the extensive in situ tunability of our system allows us to achieve the ul tra-strong coupling regime\, characterized by a Ginzburg-Landau coherence l ength reaching the average inter-particle distance and very large T_BKT/T_F ratios in excess of 0.1. These observations suggest that MATTG can be elec trically tuned close to the two-dimensional BCS-BEC crossover. Our results establish a new generation of tunable moiré superconductors with the potent ial to revolutionize our fundamental \;understanding and the applicatio ns of strong coupling superconductivity

Please emai l Rcawthor@umd.edu for Zoom Details&n bsp\;
LAST-MODIFIED:20201210T183307Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191025T160000Z DTEND:20191025T170000Z DTSTAMP:20260828T094430Z UID:3at32cuf78a9hb40bi9k8i97op@google.com CREATED:20191017T180307Z DESCRIPTION:Title: Probing Many-Body Chern Number Through Randomized Measu rement.\n\nSpeaker: Ze-Pei Cian \n\nFriday 25 October\, 12:10-12:40pm\n(piz za and drinks served 10 min. before talk)\n\nAbstract: Engineering and pro bing the topological order is an outstanding challenge in the current quant um simulators and of fundamental importance in the condensed matter physics . A great experimental efforts have been devoted to engineering strongly-co rrelated system and the topologically non-trivial band structure which make s the realization of the fractional quantum Hall liquid in the quantum simu lators possible in the near future. However\, the detection of the many-bod y topological invariant depends either on linear-response measurement which is not available in most quantum simulators or on the interferometric type measurement which requires an ancillary qubit that is highly entangled wit h the whole system. Here\, we propose an experimental scheme for measuring the many-body Chern number\, which characterizes the topological nature of the fractional quantum Hall system\, without the aid of linear-response pro perties or any ancillary qubit. Our protocol only relies on the randomized measurement that can be implemented by either single qubit rotation or quen ches dynamics with time-dependent disorder potentials. Our measurement sche me paves a realistic way for the detection the many-body topological invari ant in the near-term quantum technology platform. LAST-MODIFIED:20191017T180307Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190211T220000Z DTEND:20190211T230000Z DTSTAMP:20260828T094430Z UID:2k36kudirlr908gbjf125auq37@google.com CREATED:20190206T152547Z DESCRIPTION:Speaker: Boeing\n\nTitle: Boeing Information Session and Tech T alk\n\nAbstract: Boeing is a defense & commercial airplane business. Our or ganization focuses in the following technology areas: Materials & Fabricati on Technologies\, Structures Technologies\, Assembly & Factory Technologies \, Product Support Technologies\, and Program Support.\n\nCome hear Boeing Chief Engineer Mark Clayton give an overview of airframe components and des ign considerations\, using examples from Boeing commercial airplanes. Plus learn about opportunities for students in Aerospace\, Chemical\, Civil (St ructural)\, Electrical and Computer\, Fire Protection\, Materials & Mechani cal Engineering. Plus Computer Science and Business.\n\nAnd apply for our i nternship program at https://jobs.boeing.com/job/fairfax/engineering-intern ship-paid-summer-2019-multiple-locations/185/10485081. The deadline is Feb ruary 17\, 2019.\n\nUS Citizenship or Permanent Residency Required LAST-MODIFIED:20190206T152547Z LOCATION:1202 Glenn L. Martin Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200911T160000Z DTEND:20200911T164500Z DTSTAMP:20260828T094430Z UID:6b2rkrbjpsmk3adr41fi7t8d5g@google.com CREATED:20200903T211515Z DESCRIPTION:\n\n\nTitle: Faster Digital Quantum Simulation by Symmetry Prot ection\nSpeaker: Minh Tran\n\nSeminar will be held via Zoom:\n\nhttps://umd .zoom.us/j/97099328991\n\nAbstract: Simulating the dynamics of quantum syst ems is an important application of quantum computers and has seen a variety of implementations on current hardware. We show that by introducing quantu m gates implementing unitary transformations generated by the symmetries of the system\, one can induce destructive interference between the errors fr om different steps of the simulation\, effectively giving faster quantum si mulation by symmetry protection. We derive rigorous bounds on the error of a symmetry-protected simulation algorithm and identify conditions for optim al symmetry protection. In particular\, when the symmetry transformations a re chosen as powers of a unitary\, the error of the algorithm is approximat ely projected to the so-called quantum Zeno subspaces. We prove a bound on this approximation error\, exponentially improving a recent result of Burga rth\, Facchi\, Gramegna\, and Pascazio. We apply the symmetry protection te chnique to the simulations of the XXZ Heisenberg interactions with local di sorder and the Schwinger model in quantum field theory. For both systems\, the technique can reduce the simulation error by several orders of magnitud e over the unprotected simulation. Finally\, we provide numerical evidence suggesting that the technique can also protect simulation against other typ es of coherent\, temporally correlated errors\, such as the $1/f$ noise com monly found in solid-state experiments.\nBased on arXiv:2006.16248 LAST-MODIFIED:20200908T132455Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI/QuICS/CMTC Friday Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190130T160000Z DTEND:20190130T173000Z DTSTAMP:20260828T094430Z UID:6qb1u20ha3dngfeb2gnhke745j@google.com CREATED:20190125T194011Z DESCRIPTION:Title: A Separation between QNC^0 and AC^0.\nAbstract: Previous ly\, Bravyi\, Gosset and Konig (2018) showed a separation between constant depth quantum circuits and constant depth classical circuits. We find a rel ated problem which separates shallow classical and quantum circuits even if the classical circuit has unbounded fan-in AND gates. We will also show av erage-case hardness for the new problem. LAST-MODIFIED:20190125T194012Z LOCATION:3100A: QuICS Seminar - Luke Schaeffer SEQUENCE:0 STATUS:CONFIRMED SUMMARY:3100A: QuICS Seminar - Luke Schaeffer TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201202T160000Z DTEND:20201202T170000Z DTSTAMP:20260828T094430Z UID:3ku9iuksl6paea97ets2q348bb@google.com CREATED:20200930T162648Z DESCRIPTION:Speaker: Marsha Lester\, University of Pennsylvania\, \;http://web.sas.upen.edu/lestergroup/marsha-lester/

Title: TBA

Abstract: TBA

ZOOM: \;https://umd.zoom.us/j/93534410738?pwd=Ymw4TEJJT2swMlFRb2hmVzlMZ lJEdz09 LAST-MODIFIED:20200930T162648Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhysJoint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200401T160000Z DTEND:20200401T170000Z DTSTAMP:20260828T094430Z UID:2glams358ks137sngk2rf4m4cm@google.com CREATED:20200331T153833Z DESCRIPTION:

https://umd.zoom.us /j/975778956
Meeting ID: 975 778 956


https://mse.umd.edu/seminar-series< /a>

Speaker: \;Chitraleema Chakraborty\, \;< /b>Postdoctoral Fellow\, Computational Materials Science\, Harvard Un iversity

Title: \;Next Generation Quantum Emitter s for Scalable Quantum Technology

Abstract: Quantum emitt ers in solids are promising building blocks for scalable quantum informatio n processing\, quantum communications\, and quantum sensing. Atomically thi n materials that host quantum emitters\, when compared to three-dimensional solids\, have the advantage of reduced total internal reflection and easy coupling with interconnects. In this talk\, I will share the story of the d iscovery and control of quantum emitters in two-dimensional materials. The possibility of leveraging van der Waals heterostructure for charging these emitters with a single electron will be discussed. This lays the foundation for optically addressable spin qubits in flatland materials. Further\, I w ill also discuss their ab-initio prediction\, deterministic generation\, an d integration with photonic devices\, which offers a compelling solution to scalable solid-state quantum photonics. This work opens the frontier of qu antum optics in two-dimensional materials with the potential to revolutioni ze solid-state quantum devices.

Bio:

Chitraleema Chakrabo rty received her Ph.D. in Materials Science from the University of Rocheste r in 2018. Her thesis on Flatland Nanophotonics received the best dissertat ion award at the University of Rochester and was selected as an outstanding dissertation finalist by the American Physical Society. In 2018\, she join ed the Research Laboratory of Electronics at MIT as a postdoctoral research associate in Quantum Photonics. She is currently a postdoctoral fellow in Computational Materials Science at Harvard University.

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LAST-MODIFIED:20200331T154012Z LOCATION:VIA ZOOM ONLY - No campus location\, SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190509T123000 DTEND;TZID=America/New_York:20190509T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190509T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Identifying and Harnessing Attractor Dynamics in Neural Systems with Applications to Chaotic Time-Series Prediction and Turing-Comp lete Program Learning\nSpeaker: Garrett Katz\nSyracuse University | Departm ent of Computer Science\n\nAbstract: In this talk\, we will describe two br anches of research related to neural attractor dynamics: the first focuses on *identifying* attractors\, in order to understand what a trained network has learned\; and the second focuses on *harnessing* attractors\, in order to teach a network useful computations. More specifically\, the first part of this talk presents "directional fibers\," which are mathematical object s that can be used to systematically enumerate fixed points in many dynamic al systems. Directional fibers are curves in high-dimensional state space t hat contain the fixed points of a system and can be numerically traversed. We will define directional fibers\, derive their important theoretical prop erties\, and describe empirical results of applying directional fibers to l ocate fixed points in recurrent neural networks. For example\, directional fibers revealed that a network trained on the Lorenz system will have fixed points in correspondence with the Lorenz system fixed points\, even though the Lorenz fixed points were not included in the training data. The second part of this talk presents a "Neural Virtual Machine" (NVM)\, which is a p urely neural system that can emulate a Turing-complete computer architectur e. The NVM uses local learning rules and itinerant neural attractor dynamic s to represent\, learn\, and execute symbolic computer programs written in an assembly-like language. We will present the dynamical equations of the N VM\, explain how it can be used to carry out algorithmic tasks\, and presen t results of computer experiments that quantify its performance and scaling requirements. In particular\, we demonstrate that the number of neurons re quired is only linear in the size of the programs being emulated. LAST-MODIFIED:20190314T184854Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181101T170000Z DTEND:20181101T183000Z DTSTAMP:20260828T094430Z UID:3klrl18aaheo543ejmbh71cgko@google.com CREATED:20180828T143556Z DESCRIPTION:No seminar today\n\nSpeaker: Sarah Wesolowski\, Salisbury Unive rsity LAST-MODIFIED:20181016T125157Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Canceled** Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200305T153000 DTEND;TZID=America/New_York:20200305T163000 DTSTAMP:20260828T094430Z UID:0s7ms3ct4sb3ojumcormsgv5jm@google.com RECURRENCE-ID;TZID=America/New_York:20200305T153000 CREATED:20200213T164329Z DESCRIPTION:

Spin TQFTs

Speaker: Jerry Yao-Chieh Hu (UMCP Physics)

For upcoming talks in this series:

http://www-m ath.umd.edu/gcal_rss.php?seminar_key=RGP&\;year=2020&\;html


https://www-math.u md.edu/research/seminars/current-rits-and-student-seminars.html
LAST-MODIFIED:20200213T174928Z LOCATION:MTH (Kirwan Hall) 1313 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191009T150000Z DTEND:20191009T160000Z DTSTAMP:20260828T094430Z UID:7uma2a803a6819snofq7octcq5@google.com CREATED:20190903T170114Z DESCRIPTION:Speaker: Rongchao Jin\, Carnegie Mellon University\n\nTitle: To ward Atomic Precision in Nanoscience\n\nAbstract: Recent advances in nanosc ience research have marched toward controlling nanoparticles with atomic pr ecision. In this talk I will present some breakthroughs in gold nanoparticl e research\, including the atom-precise synthesis\, total structure determi nation by X-ray crystallography\, and applications in catalysis. Such perfe ct gold nanoparticles can be formulated as Aun(SR)m\, where SR = thiolate l igand\, n and m refer to the precise numbers of gold atoms and surface liga nds\, respectively. By controlling nanoparticles with atomic precision\, on e can now reveal the long-sought-after total structures (i.e. metal core pl us surface ligands) of nanoparticles. Significant progress has been recentl y achieved in determining the total structures of Aun(SR)m nanoclusters ran ging from subnanometer Au18(SR)14 to 2.2 nm Au246(SR)80. These ultrasmall n anoparticles exhibit intriguing electronic and optical properties with mani festations of strong quantum size effects and allow for quantum-state manip ulation. The attainment of atomically precise nanoparticles has offered exc iting opportunities to pursue many fundamental issues that were previously difficult to tackle\, such as the periodicities in nanoclusters\, structura l isomerization\, chirality\, nanoscale self-assembly monolayer (SAM) struc ture\, and many other mysteries at the nanoscale. Such nanoclusters also ho ld potential in catalysis\, optics\, energy conversion\, and sensing applic ations. LAST-MODIFIED:20191002T161505Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200414T160000 DTEND;TZID=America/New_York:20200414T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200414T160000 CREATED:20190530T191015Z DESCRIPTION:W.J. Carr Lecture
Dal e J Van Harlingen\, University of Illinois


Hosted by JP Paglione LAST-MODIFIED:20200312T170318Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191125T200000Z DTEND:20191125T213000Z DTSTAMP:20260828T094430Z UID:5fk4nu5ff8g9qqbn25cr0e0bbf@google.com CREATED:20190806T155919Z DESCRIPTION:Toby Opferkuch\, CERN\n\n\nTitle: Particle Physics in the Gravi tational Wave Era\n\nAbstract: In this talk I will discuss various connecti ons between gravitational waves and particle physics. The first part focuse s on current measurements of neutron star mergers as a probe of long-range forces. In this context I will focus on dark matter and new flavoured gauge symmetries such as Lmu-Ltau\, where sensitivity in the latter case arises from the large inevitable abundance of muons in neutron stars. In the secon d part of my talk I will present a model for viable gravitational reheating involving a scalar field directly coupled to the Ricci curvature scalar. C rucial to the model is a period of kination after inflation\, which causes the Ricci scalar to change sign inducing a tachyonic effective mass $m^2 \\ propto -H^2$ for the scalar. The resulting tachyonic growth of the scalar f ield provides the energy for reheating. This required period of kination ne cessarily leads to a blue-tilted primordial gravitational wave spectrum wit h the potential to be detected by future experiments. Lastly\, I will discu ss the case where the Higgs field plays the role of the scalar field. LAST-MODIFIED:20191120T162920Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191003T180000Z DTEND:20191003T190000Z DTSTAMP:20260828T094430Z UID:6s4lrcpi6ha5513vi2mdl5qeqg@google.com CREATED:20190927T170430Z DESCRIPTION:Title: Probing Strange Metal Behavior in High-Tc Superconductor s With High Magnetic Fields \nSpeaker: Ian Hayes\, University of Maryland\ n\nAbstract: \nUnderstanding the strange metallic state that appears near o ptimal doping in the cuprate high-Tc superconductors remains a major challe nge in condensed matter physics. The signatures of this state in the charge transport sector—a T-linear resistivity and a Hall coefficient that goes a s 1/T--have now reappeared in the iron-based high-Tcs\, confirming their re levance for understanding high-Tc superconductivity. In this talk I will re view an extensive set of high magnetic field measurements on the iron-pnict ide superconductor BaFe2(As1-xPx)2 that establish striking parallels betwee n the field and temperature dependence of both the resistivity and the Hall coefficient in the strange metal regime. These observations significantly expand the phenomenology of the strange metal. In particular\, they reveal scaling behavior in the resistivity near optimal doping\, and sharp correla tion between anomalous behavior in R_H and superconductivity. I will discus s the implications of these data for theoretical approaches to the strange metal state\, as well as related observations in other compounds.\n\n\n\nHo st: Local\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20190930T132858Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Ian Hayes TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190212T181500Z DTEND:20190212T191500Z DTSTAMP:20260828T094430Z UID:78n0mahjqv9j6ualndvsjlgh6e@google.com CREATED:20190124T134308Z DESCRIPTION:Speaker: Professor Jutta Luettmer-Strathmann\, University of Ak ron\n\nTitle: Configurational Contribution to the Soret Effect of a Protein Ligand Systems-An Investigation with Density-of-States Simulations\n\nAbst ract: Many of the biological functions of proteins are closely associated w ith their ability to bind ligands and change conformations in response to c hanging conditions. Since binding state and conformation of a protein affec t its response to a temperature gradient\, they may be probed with thermoph oresis. In recent years\, thermophoretic techniques to investigate biomolec ular interactions\, quantify ligand binding\, and probe conformational chan ges have become established. To develop a better understanding of the mecha nisms underlying the thermophoretic behavior of proteins and ligands\, we e mploy a simple\, off-lattice model for a protein and ligand in explicit sol vent. To investigate the partitioning of the particles in a temperature gra dient\, we perform Wang-Landau type simulations in a divided simulation box and construct the density of states over a two-dimensional state space. Th is method gives us access to the entropy and energy of the divided system a nd allows us to estimate the configurational contribution to the Soret coef ficient. In this work\, we focus on dilute solutions of hydrophobic protein s and investigate the effect of ligand binding on their thermophoretic beha vior. We find that our simple model captures important aspects of protein-l igand interactions and allows us to relate the binding energy to the change in Soret coefficient upon ligand binding. LAST-MODIFIED:20190205T152524Z LOCATION:IPST 1116 Conference Room (bldg. #085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T160000Z DTEND:20181114T170000Z DTSTAMP:20260828T094430Z UID:7jnnps5pbe17b8ileko6markpu@google.com CREATED:20180905T135631Z DESCRIPTION:Speaker: Professor Qing Cao\, IBM/University of Illinois at Urbana-Champaign

Title: Carbon Nanotube Transistor Tec hnology for Extremely-Scaled Logic Devices


Abstract: Conventional scaling of Si complementary metal-oxide semiconductor devices as described by Moore’s law provided exponentially improving transistor per formance\, density\, power\, and cost in the last five decades. However\, i t has become increasingly difficult in recent 10 years with Si devices appr oaching their physical limits. In search for the next switch beyond silicon \, carbon nanotubes are a very promising candidate. In this talk\, I will r eview our recent efforts at IBM on developing carbon nanotube transistor te chnology for the next-generation logic chips. I will first discuss why the unique material properties of carbon nanotubes\, including their intrinsic thinness (about 1 nm in diameter)\, high carrier saturation velocity\, and capability to form low-resistance\, end-bonded contacts\, are critical for device scaling from industrial perspective. Our recent results further prov ed in experiment that the combination of all these attributes indeed leads to substantially improved performance of extremely-scaled nanotube transist ors down to merely 40 nm overall footprint compared to what is possible wit h Si. \; Moreover\, recent progress on the purification of semiconducti ng nanotubes to purity above 99.999%\, and their subsequent assembly into w ell-aligned arrays with unprecedented high nanotube density allowed us to d emonstrate the first nanotube-array transistor to outperform their best-com peting silicon devices in on-state conductance without any normalization. T hese results suggest that replacing Si with carbon nanotubes in high-perfor mance logic device at the 5-nm technology node and beyond is not only physi cally plausible but also technically feasible. Currently the major obstacle is reducing the device variability. Scientific understanding of its major source provides guideline to rationally address this challenge with materia ls and engineering innovations. A concluding discussion provides perspectiv es on the future of carbon nanotube based nanoelectronics. LAST-MODIFIED:20181113T132335Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190201T183000Z DTEND:20190201T200000Z DTSTAMP:20260828T094430Z UID:0bb8jnir4d9pttv1rd5qg7vjqv@google.com CREATED:20190128T155439Z DESCRIPTION:Title : Vortices : A new diagnostic for phase transition in den se matter. \n\nSpeaker: Srimoyee Sen\, University of Washington\n\nAbstract : Nuclear theory is currently going through an exciting phase in anticipat ion of the wealth of data expected from the Facility for Rare Isotope Beams (FRIB) and gravitational waves in LIGO. One of the major areas of interest in nuclear theory today is the study of the origin of elements or nucleosy nthesis.\nThe process of nucleosynthesis takes place in extreme events like the explosion of supernovae and collision of neutron stars which can harbo r matter at such high densities that atomic nuclei dissolve producing a fer mi liquid of nucleons. In order to make progress in understanding nucleosy nthesis hence\, it is of utmost importance to understand the properties of such dense matter as well as accurately model its equation of state.\n\nIn this talk I discuss the various patterns of organizations expected to arise in dense baryonic matter and how modern developments in topological phase transitions in condensed matter systems combined with perturbative techniqu es in quantum chromodynamics\, the theory of strong interactions\, can info rm our knowledge in this regard. LAST-MODIFIED:20190129T142607Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201201T181500Z DTEND:20201201T191500Z DTSTAMP:20260828T094430Z UID:67tbv4o98432osre5r12nfo9u9@google.com CREATED:20200923T161118Z LAST-MODIFIED:20200923T161118Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200818T150000Z DTEND:20200818T160000Z DTSTAMP:20260828T094430Z UID:5uk12049cl4bh0mqn3fludel5c@google.com CREATED:20200811T191333Z DESCRIPTION:Speaker: Igor \;Mazin \;(George Mason University )

Title: Ising superconductivity in NbSe2 monolayers

Abstract : Recent studies on superconductivity in monolayer NbSe2 have demonstrated a giant anisotropy in the superconducting critical field. This phenomenon w as quite well understood in terms of the so-called "Ising superconductivity "\, where the spins of Cooper pairs are strictly aligned with one particula r crystallographic direction. Besides the (formally infinite) critical fiel d anisotropy Ising superconductors (IS) have demonstrated a number of unusu al and seeming exotic phenomena. IS is sometimes misleading perceived as an esoteric subset of the theory of superconductivity\, which is hard to expl ain and even harder to understand for outsiders. In the first part of my ta lk I will debunk this notion and demonstrate that the physics of IS is exce edingly simple and hardly requires any formulaics to be grasped. In the sec ond part I will make\, in terms of DFT calculations\, a quantitative connec tion with the specific material in which most of the IS studies are being p erformed\, monolayer NbSe2\; in particular\, I will show that\, contrary to a common misconception\, NbSe2 is close to a magnetic instability and this fact cannot be ignored when discussing IS. In the third part I will discus s to what extent the existing models allow for a sizeable singlet-triplet m ixing (NbSe2 had been till recently believed to be\, for all intents and pu rposes\, a singlet superconductor\, but that is not necessarily the case). Up to now the talk will be based on our paper with Darshana Wickramaratne ( NRL) and Daniel Agterberg (UWi)\, to be published in PRX. If time allows\, I will also say a few words about the new experiments from the Fai Mak grou p in Cornell and present some results from our work in progress with Darsha na and Maxim Khodas (Hebrew U) striving to explain his observations microsc opically.

Host: Victor Yakovenko \; LAST-MODIFIED:20200811T191333Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191113T203000Z DTEND:20191113T213000Z DTSTAMP:20260828T094430Z UID:7beup1qpstqofvff0ckmk7qjhp@google.com CREATED:20191105T212403Z DESCRIPTION:Title : Outstanding Questions of Solar Wind Physics\nSpeaker Na me: Nicholeen Viall\nSpeaker Institution : Goddard Space Flight Center\nAbs tract : The atmosphere of the Sun\, the solar corona\, is hundreds of times hotter than the visible surface below. The details of the physical mechani sms involved in energizing the solar atmosphere continue to elude scientist s. This plasma flows outward from the Sun\, becoming the solar wind\, where it reaches supersonic and super-Alfvénic speeds\, filling the solar system . There have been remote observations of the solar corona for centuries\, a nd in situ measurements of the solar wind for almost 60 years. Computer sim ulation capabilities have commenced\, and simulation techniques of the coup ling between the solar atmosphere and solar wind continue to advance. Yet t here are longstanding\, major unsolved issues involving universal physical processes such as magnetic reconnection\, turbulence\, and waves. We discus s a recent review of several aspects of these questions\, and future prospe cts with the Parker Solar Probe\, Solar Orbiter\, and Polarimeter to Unify the Corona and Heliosphere missions. LAST-MODIFIED:20191105T212427Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181025T180000Z DTEND:20181025T193000Z DTSTAMP:20260828T094430Z UID:448m1p6tdmvp5i3mijrr23c5q9@google.com CREATED:20180914T185907Z DESCRIPTION:\nTitle: Spontaneously polarized half-gapped superconductivity\ n\nSpeaker: Nick Butch\, NIST\n\nAbstract: \nOne of the most interesting di fferences between spin triplet superconductors and the conventional spin va riety is the two-component triplet order parameter that allows spin up and down electrons to couple with different strength. Such nonunitary supercond uctors\, in which spin up and down components have different gaps and an in trinsic spin polarization\, are ideal platforms for studying topological ph enomena. So far\, the only established examples of nonunitary pairing inclu de the superfluid 3He in high magnetic fields\, known as the A1 phase\, as well as ferromagnetic superconductors. It is an intriguing question whether nonunitary pairing can happen in the absence of a magnetic field - externa l or internal - thus spontaneously breaking time-reversal symmetry. Here we report the discovery of novel nonunitary spin-triplet superconductivity in UTe2\, which closely resembles the ferromagnetic superconductors with dram atically enhanced transition temperature and upper critical field\, and a p aramagnetic normal state. UTe2 exhibits the crucial ingredients of a nonuni tary triplet superconducting state\, namely: an extremely large\, anisotrop ic upper critical field Hc2\, temperature independent NMR Knight shift in t he superconducting state that can only be due to triplet pairing\, and a la rge residual normal electronic density of states indicating that half of th e electrons remain ungapped. In other words\, a spin up superfluid coexists with a spin down Fermi liquid. This discovery yields a new platform for en coding information using topological excitations and for manipulation of sp in-polarized currents. \nHost: Local LAST-MODIFIED:20181024T183937Z LOCATION:Rm 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM- Nick Butch\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191010T180000Z DTEND:20191010T190000Z DTSTAMP:20260828T094430Z UID:17vhhb1ratbcbpb6vvascor9dg@google.com CREATED:20190819T171027Z DESCRIPTION:Title: Using resonant ultrasound spectroscopy to identify multi -component superconductors\nSpeaker: Brad Ramshaw\, Cornell\nAbstract: \nSr 2RuO4 has stood for over 25 years as the most likely candidate for spin-tri plet superconductivity\, where Cooper pairs are formed from electrons of th e same spin type\, rather than the opposite-spin pairing found in nearly al l other superconductors. One of the best pieces of experimental evidence fo r spin-triplet superconductivity---a lack of Knight shift through Tc---was recently found to have been measured incorrectly\, and subsequent measureme nts show a conventional Knight shift. This has cast a great amount of doubt over whether Sr2RuO4 is spin triplet\, although there are still many other puzzling experimental results that must be reconciled. One such result is an unpublished measurement of a discontinuity in the the c66 shear elastic modulus through Tc. Such a discontinuity can only result from a two-compone nt superconducting order parameter\, and the spin-triplet px+ipy is the bes t candidate. This result\, however\, was unpublished due to systematic unce rtainty in the measurement and an inability to reproduce it. We have perfor med the first measurement of all six elastic moduli through Tc Sr2RuO4\, an d found that the shear modulus c66 shows a clear discontinuity at the phase transition\, identifying the superconducting order parameter as two-compon ent. While px+ipy remains the most likely candidate\, dxz\,yz remains possi ble\, along with other p-wave states which may be ruled out by other measur ements. We also obtain dynamic information about the order parameter throug h the ultrasonic attenuation\, which exhibits a peak below Tc in the compre ssional moduli and suggests the formation of domains of the superconducting order parameter - more evidence for a two-component order parameter. Taken together this information strongly constrains the order parameter symmetry in Sr2RuO4\, and makes the recent discovery of a Knight-shift below Tc in Sr2RuO4 even more puzzling.\n\nHost: Johnpierre Paglione\n\nRefreshments 1: 30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20190829T174531Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Brad Ramshaw\, Cornell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190327T190000Z DTEND:20190327T203000Z DTSTAMP:20260828T094430Z UID:2g6hh3lnedkatn4vrlbqhlbj3v@google.com CREATED:20190129T150556Z DESCRIPTION:\n\nTitle: Ultralight boson detection with gravitational waves\ n\nAbstract: Abstract: If ultralight bosons with Compton wavelength compara ble to the horizon radius of astrophysical black holes exist in nature\, th ey can extract energy from the black hole and form "bosonic clouds". I will discuss different proposals to search for bosonic clouds with gravitationa l wave detectors on Earth and in space\, including: (i) searches for the co ntinuous\, quasi-monochromatic waves emitted by the cloud\; (ii) searches f or the stochastic backgrounds produced by black hole populations\; (iii) fo llow-up searches for the quasi-monochromatic signal produced by the remnant of binary black hole mergers that should be detected almost routinely by E arth-based interferometers\; (iv) the detection of boson clouds using their unique signatures in extreme mass-ratio inspirals that could be observed b y LISA\; and (v) gravitational wave signatures of the cloud depletion that may be induced by a companion in binary systems. LAST-MODIFIED:20190322T132046Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190424T163000Z DTEND:20190424T170000Z DTSTAMP:20260828T094430Z UID:1qp6gv21d5bq934piu2orj87o1@google.com CREATED:20190301T161425Z DESCRIPTION:Gordan Krnjaic\, Fermilab

Joint Particle theory-exper iment Maryland-Hopkins Seminar


Seminar will be preceded by l unch at 12:30 pm to 1:30pm. The talk is from 1:30 to 2:30pm pm. \;
< br>Title: A New Frontier in the Search for Dark Matter

Abstract: The gravitational evidence for the existence of dark matter is overwhelming\; observations of galactic rotation curves\, the CMB power spectrum\, and lig ht element abundances independently suggest that over 80% of all matter is “dark” and beyond the scope of the Standard Model. However\, its particle n ature is currently unknown\, so discovering its potential non-gravitational interactions is a major priority in fundamental physics. In this talk\, I will survey the landscape of light dark matter theories and and introduce an emerging field of fixed-target experiments that are poised to cover hith erto unexplored dark matter candidates with MeV-GeV masses. These new techn iques involve direct dark matter production with proton\, electron\, and *m uon* beams at various facilities including Fermilab\, CERN\, SLAC\, and JL ab. Exploring this mass range is essential for fully testing a broad\, pred ictive class of theories in which dark matter abundance arises from dark-vi sible interactions in thermal equilibrium in the early universe.

Seminar Slides LAST-MODIFIED:20190426T183922Z LOCATION:Johns Hopkins University\, Bloomberg Hall\, Rm 462 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Particle theory-experiment Maryland-Hopkins Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181116T170000Z DTEND:20181116T174500Z DTSTAMP:20260828T094430Z UID:3rq29ucmuviml53a19l8gqgnu9@google.com CREATED:20181106T173309Z DESCRIPTION:Title: Measuring topology in a synthetic dimensions lattice\n\n Speaker: Dina Genkina\, JQI\n\nAbstract: Topology in 2-D materials is impor tant and cool\; it explains the quantum Hall effect\, and in the limit of r eally high magnetic fluxes (of order 10^4 Tesla for crystalline materials) gives rise to the fractal Hofstadter butterfly. These high fluxes are inacc essible in traditional condensed matter settings\, but we engineered them i n our effective 2-D lattice of ultracold 87Rb atoms. We created this lattic e using a synthetic dimensions approach: a real 1-D lattice defined sites a long the first\, 'real'\, dimension\, while the internal spin states of the atoms served as sites along a second\, 'synthetic'\, dimension. We then to ok advantage of the hybrid imaging that occurs in this lattice during time of flight: momentum is measured along the 'real' axis\, while position is m easured along the 'synthetic' axis with single site resolution. This allowe d us to map out the position of the atoms in the synthetic direction for ev ery point in the lowest band\, i.e. for every value of the real axis crysta l momentum. We then levered a Diophantine equation derived by Thouless\, Ko homoto\, Nightingale\, and den Nijs to extract the topological invariant of our system\, in 2-D called the Chern number\, and provide an intuitive pic ture of how this equation arises in our system. \n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181106T173309Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201103T160000Z DTEND:20201103T170000Z DTSTAMP:20260828T094430Z UID:75esi4504h9ruqfkudfd8m86j3@google.com CREATED:20201020T152100Z DESCRIPTION:
TITLE: Study of charge transport mechanisms in single dsDNA molecules
SPEAKER: Roman Zhuravel\, Hebrew University

DATE/TIME 3 November 2020\, 11am ET\, \;https://umd.zoom.us/j/95710381964

Meeting ID: 957 1038 1 964 \; \;

ABSTRACT
Understanding charge transport in DNA molecules is a long-standing problem of fundamental importance across disci plines. It also has a great technological interest due to DNA’s ability to form versatile and complex programmable structures. Experiments so far have yielded seemingly contradictory results that range from insulating or semi conducting to metallic-like behavior. Here we report charge transport measu rements through single 30 nm long double-stranded DNA (dsDNA) molecules wit h an experimental setup that enables us to address individual molecules rep eatedly and perform source-drain-gate measurements at a wide range of tempe ratures. We observe surprisingly high currents and unusual temperature depe ndence\, which contradicts the most commonly accepted transport mechanisms for DNA but might be consistent with charge transport in organic crystals. Moreover\, we show that the presence of even a single discontinuity (“nick” ) in both strands composing the dsDNA leads to complete suppression of the current\, suggesting that the backbones mediate the long-distance conductio n in dsDNA\, contrary to the common wisdom in DNA electronics. LAST-MODIFIED:20201020T152100Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Roman Zhuravel TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190430T160000 DTEND;TZID=America/New_York:20190430T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190430T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Anson Hook\, University of Maryland\n\nTitle : The The ory and Search for Axions\n\nAbstract : The axion is one of the favorite ca ndidates for dark matter as it is a dark matter candidate that simultaneous ly also explains why the neutron electric dipole moment is small. One of t he most interesting thing about axions are the many and varied ways in whic h it can be searched for. We describe a few of these methods ranging from laboratory based experiments such as cavities and interferometers to astrop hysical systems such as white dwarfs and neutron stars. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201023T170000Z DTEND:20201023T180000Z DTSTAMP:20260828T094430Z UID:09j5fk2sr76clrg0q76580d8d0@google.com CREATED:20200923T165007Z DESCRIPTION:Speaker: Heather Quin\, Technical Staff Member\, Los Alamos Nat ional Lab \n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200930T160145Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190214T123000 DTEND;TZID=America/New_York:20190214T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190214T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Time-delayed optoelectronic oscillators: theory and appl ications\nSpeaker: Yanne Chembo\nUniversity of Maryland | Department of Ele ctrical and Computer Engineering/IREAP\n\nAbstract: Time-delayed optoelectr onic oscillators (OEOs) are at the center of a very large body of scientifi c literature. The complex behavior of these nonlinear oscillators has been thoroughly explored both theoretically and experimentally\, leading to a be tter understanding of their dynamical properties. Beyond fundamental resear ch\, these systems have also inspired a wide and diverse set of application s\, such as optical chaos communications\, pseudo-random number generation\ , optoelectronic reservoir computing\, ultra-pure microwave synthesis\, opt ical pulse-train generation\, and sensing. In this communication\, we will provide a comprehensive overview of this field\, outline the latest achieve ments\, and discuss the main challenges ahead. LAST-MODIFIED:20190207T135307Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190423T160000 DTEND;TZID=America/New_York:20190423T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190423T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Vlad Manucharyan\, University of Maryland\n\nTitle: Ph ysics and Applications of Quantum Superconducting Circuits LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190222T180000Z DTEND:20190222T190000Z DTSTAMP:20260828T094430Z UID:0ihg55ckoejhdpejujq0tor714@google.com CREATED:20190124T141022Z DESCRIPTION:Speaker: Amanda L. Forster\, Materials Research Engineer\, NIST

Title: Amanda L. Forster\, Materials Research Engineer\, NIST

Abstract: To improve properties such as thermal conductivity\, low temperature thermal strain\, and creep resistance of UHMMPE fibers\, resea rchers have undertaken efforts to crosslink these fibers using radiation. I onizing radiation is commonly used to crosslink bulk UHMMPE in other applic ations\, such as artificial joints. However\, UHMMPE fibers differ from bu lk UHMMPE in that they have a higher crystallinity and are very highly orie nted during manufacture through a process known as "superdrawing\," in whic h the fibers are stretched 50 to 100 times their original length\; thus\, t he amorphous fraction of the UHMMPE fibers is also highly ordered. Experime nts have been conducted to crosslink the UHMMPE fibers using both low dose rate (gamma) and high dose rate (electron beam) irradiation\, all in the ab sence of oxygen to minimize the probability of oxidation. In all cases\, th e tensile strength was greatly reduced by the irradiation. Oxidation index was also measured for the irradiated samples\, and oxidation was not found to play a major role in the reduction of tensile strength in the fibers aft er irradiation. Chain scission is highly catastrophic in a high molecular w eight system\, and available crosslink sites are saturated at low dose due to the low amorphous content of these fibers. After the crosslink sites are saturated\, chain scission becomes dominant in the fiber\, greatly reducin g its mechanical properties\, likely due to preferential scission of the “t aut tie molecules” that connect crystalline regions in the fiber. While thi s work did not achieve the desired result of improving the mechanical prope rties of the UHMMPE fiber\, a surprising result was found. Several authors have previously examined the effect of irradiation on the physical propert ies of UHMMPE fibers\, however no work could be found that examined the fre e radicals formed in the fibers after irradiation. Accordingly\, the EPR sp ectrum of the UHMMPE fibers was measured shortly after irradiation\, and al kyl radicals were detected. The irradiated samples were stored in dark ambi ent conditions for at least five years\, then then reexamined using EPR for free radicals. Surprisingly\, the gamma-irradiated samples showed clear ev idence of long-lived polyenyl radicals. The alkyl radicals formed immediate ly after irradiation would be expected to react quickly to form polyenyl ra dicals. One possible explanation for the presence of these polyenyl radica ls so long after irradiation is the high crystallinity of these UHMMPE as c ompared to typical bulk polyethylene. Typically\, these polyenyl radicals w ould be expected to eventually migrate to the surface of the crystalline do main and be eliminated in the amorphous region. However\, we suspect that due to the high crystallinity and large anisotropy of the highly drawn UHMM PE fiber\, the polyenyl radicals were unable to eliminate and were trapped in the crystal. An experiment was performed to test this hypothesis\, by wh ich a sample of the irradiated fibers were heated to temperatures above the alpha relaxation for polyethylene\, and EPR measurements showed that the p olyenyl radical signal persisted. Then\, the fibers were heated to tempera tures above the melting point of the polymer\, and EPR signals showed that the polyenyl signal was rapidly eliminated. These experiments support the h ypothesis that the long-lived polyenyl radicals were trapped in the crystal line region of the polyethylene fibers.



 LAST-MODIFIED:20190205T152724Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200312T180000Z DTEND:20200312T190000Z DTSTAMP:20260828T094430Z UID:55ilk6khj4fq5c29l13k3mvd7g@google.com CREATED:20200227T173131Z DESCRIPTION:Title: Room temperature quantum spin Hall effect \nSpeaker: Ronny Thomale\, Institut fur Theoretische Festkorperphysik Julius-Maximilia ns-Universitat Wurzburg Am Hubland \nAbstract: \nSince its discovery in H gTe/CdTe quantum wells in 2007\, the quantum spin Hall effect (QSHE) has be en the central catalysis of the search for topological quantum matter. Feat uring spin-selective dissipationless edge channels\, the QSHE promises appl ications in spintronics as well as logic electronic processing with low pow er consumption. While HgTe/CdTe and related semiconductor compounds seem to constrain the QSHE to low temperatures\, i.e.\, small insulating bulk gaps \, the challenge is to find realizations at higher operational temperatures in order to facilitate technological applicability. We develop a theorecti cal paradigm for room temperature QSHE materials by design\, involving a ta ilored arrangement of spin-orbit coupling\, lattice symmetry\, and multi-or bital hybridization profile. Our theoretical predictions apply to the heter ostructure Bi/SiC as a candidate for room temperature QSHE\, featuring an o bserved bulk gap of 670 meV. We further revisit the QSHE found in WTe2 mono layers\, where we identify a custodial glide symmetry as the source for hig h temperature QSHE. In the predicted QSHE mineral jacutingaite\, we reveal the possibility of reaching unconventional triplet f-wave superconductivity already at moderate doping. \n\n\n \nHost: J. Sau\n\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117. Please bring your own coffee mug! LAST-MODIFIED:20200227T173131Z LOCATION:John S Toll Physics Bldg Room 1201\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Ronny Thomale\, Institut fur Theoretische Festkorp erphysik Julius-Maximilians-Universitat Wurzburg Am Hubland TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181105T210000Z DTEND:20181105T220000Z DTSTAMP:20260828T094430Z UID:4b80odck5n4s3arfmslthkg6rg@google.com CREATED:20181012T162938Z DESCRIPTION:Title: Stressing cells and gels: exploiting gradients in two di fferent systems\n\nSpeaker: Sujit Datta\, Princeton University\n\nNotes: ht tp://www.marylandbiophysics.umd.edu/seminars/\n\nAbstract: Diverse applicat ions\, ranging from actuation to drug delivery to bioremediation\, rely on how biological systems respond to environmental gradients. In this talk\, I will present two examples\, in two very different settings\, of how we use gradients to direct behavior. First\, I will describe our work using highl y-resolved imaging and soft materials engineering to study how nutrient gra dients impact bacterial motion in three-dimensional porous media. Our measu rements reveal how gradient-induced motility depends sensitively on pore-sc ale confinement. Second\, I will describe how we combine experiments and po roelasticity theory to investigate the influence of osmotic stresses in hyd rogel packings. In some cases\, the stresses that develop cause packings to crack. We show how cracking behavior depends on gradients in the stress pr ofile\, suggesting a way to control material behavior in this complex syste m. Ultimately\, our work stimulates new findings and questions at the inter face of Physics\, Biology\, Materials Science\, and Engineering. LAST-MODIFIED:20181019T134446Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201030T160000Z DTEND:20201030T164500Z DTSTAMP:20260828T094430Z UID:2jhvk16gd9dbaqkarv289gk62i@google.com CREATED:20201020T201118Z DESCRIPTION:Title : Emergent Gravity in an Approximate Quantum Error Correc tion Code
Speaker : Charles Cao
Time : \;12 - 12:45pm\, Friday\, Oct. 30

Seminar will be held vi a Zoom: \;https://umd.zoom. us/j/97099328991 \;and Meeting ID : 970 9932 8991


It is known that the AdS/CFT correspondence is related to approximate quan tum error correction codes. However\, the exact manner in which gravity can arise in such codes remains largely unexplored. Here we construct an appro ximate quantum error correction code which can be represented as a holograp hic tensor network. In the "noiseless" \;limit\, it admits a local log- depth decoding circuit and reproduces certain properties of holography\, su ch as the Ryu-Takayanagi formula and subregion duality\, \;much like ot her known holographic codes. \;However\, the code becomes approximate w hen "coherent noise" is injected\, allowing it to capture features analogou s to those of gravity\, such as back-reaction\, subspace-dependence\, and a pproximate bulk locality. \; I will briefly explain what these features are and how they are manifested in the tensor network. The talk is based o n (https://arxiv.org/abs/2010.05960). \; LAST-MODIFIED:20201020T201541Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200227T153000 DTEND;TZID=America/New_York:20200227T163000 DTSTAMP:20260828T094430Z UID:0s7ms3ct4sb3ojumcormsgv5jm@google.com RECURRENCE-ID;TZID=America/New_York:20200227T153000 CREATED:20200213T164329Z DESCRIPTION:2D Pin TQF Ts and the Dimer Model

Speaker: Sri Tata (UMCP Physics)


For upcoming talks: http://www-math.umd.edu/gcal_rss.php?seminar_key=R GP&\;year=2020&\;html LAST-MODIFIED:20200213T171845Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201123T110000 DTEND;TZID=America/New_York:20201123T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201123T110000 CREATED:20200924T011350Z DESCRIPTION:Title:  \;Superconductivity wins election over dissipation& nbsp\;

Speaker: Philippe Joyez

Abstract:  \;In 1962 Josep hson predicted that an electric current can flow with no applied voltage th rough a thin insulating layer separating two superconductors. Since then\, such "Josephson junction" has become has become the routinely used in many quantum electronic circuits (squids magnetometers\, parametric amplifiers\, superconducting qubits\,...) and its use in the Volt metrology has helped reshape the International System of Units around quantum effects. Surprisin gly\, despite these long and successful applications in various areas\, the re are still subtle unresolved issues regarding how the junction interacts with its electromagnetic environment. \;

Here\, we show experime ntally that\, contrary to what is long predicted and commonly believed\, a Josephson junction connected to a resistor does not become insulating above some value of the resistance due to a dissipative quantum phase transition . We develop a new theoretical analysis which accounts for our observation and resolves previous inconsistencies in the theory. We also discuss why a phase transition is not observed in this system even though its presence wa s confirmed in systems thought to be equivalent.
We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates w ill receive a Zoom link in an email announcing each seminar. For those with out access to Zoom\, we will also be live streaming each seminar on YouTube . Once a seminar starts\, you will find a link to the live stream on our Yo uTube page at \;https:// www.youtube.com/user/JQInews \;(link \;is external) LAST-MODIFIED:20201109T184404Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200207T170000Z DTEND:20200207T173000Z DTSTAMP:20260828T094430Z UID:7iukl3c2a378m1qh2ma8ja9uig@google.com CREATED:20200129T222420Z DESCRIPTION:Title: Emergent Space-times and how to find them\nSpeaker: Cha rles Cao\n\n\n(pizza and drinks served at 12pm\; talk starts at 12:10pm)\n\ nAbstract: The AdS/CFT correspondence is a concrete instance of holographic duality\, where a bulk theory of quantum gravity in d+1 dimensions can eme rge from a conformal field theory (CFT) in d dimensions. In particular\, we expect the semi-classical spacetime of d+1 dimensions to emerge from the e ntanglement patterns of certain quantum states in the CFT. Therefore\, it i s crucial to understand what kind of states encode such spacetime geometrie s and how to explicitly reconstruct these geometries from quantum entanglem ent. In this talk\, I will address these questions using the techniques of tensor Radon transform. We find that\, given the boundary entanglement entr opies of a 2d CFT\, this framework provides a quantitative measure that det ects whether the bulk dual has a semi-classical geometry in the perturbativ e limit. In the case where a well-defined bulk geometry exists\, we also re construct the bulk metric tensor numerically. We then examine the emergent bulk geometries for static and dynamical cases in holography and in manybod y systems. LAST-MODIFIED:20200206T182959Z LOCATION:ATL 2324 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190227T190000Z DTEND:20190227T203000Z DTSTAMP:20260828T094430Z UID:5r8t8vr66rm061c7sscv55cfoc@google.com CREATED:20190129T145134Z DESCRIPTION:Caroline Robin\, INT\n\nTitle: Charge-exchange modes and weak-i nteraction processes in Relativistic Nuclear Field Theory\n\nAbstract: Nucl ear excitations with isospin transfer play a crucial role in our understand ing of nuclear structure\, particle physics and astrophysics. A precise des cription of such transition modes is necessary to compute the rates of weak interaction processes such as beta decay\, neutrino absorption or electron capture\, which are needed for the modeling of nucleosynthesis and stellar evolution. In this talk I will present a theoretical approach to the descr iption of charge-exchange modes in nuclei. This method describes the nucleu s as a system of relativistic nucleons interacting via effective meson exch ange and applies nuclear field theory to account for inter-nucleon correlat ions emerging from the coupling between nucleons and collective vibrations. In the charge-exchange channel the particle-vibration coupling generates a time-dependent proton- neutron interaction\, in addition to the static pio n and rho-meson exchange\, which induces fragmentation and spreading of the transition strength distribution. Such dynamical effects are essential for an accurate description of giant resonances and low-energy modes\, and hav e a great impact on the calculation of weak-interaction rates and on the qu enching of the Gamow- Teller strength. I will present some applications to Gamow-Teller transitions as well as single- and double-beta decay in nuclei of various masses. LAST-MODIFIED:20190215T160603Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191125T110000 DTEND;TZID=America/New_York:20191125T113000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191125T110000 CREATED:20190906T171016Z DESCRIPTION:Title: \;Mobius Insulator and Higher-Order Topology in MnBi (2n)Te(3n+1) \; \;

Speaker: \; Ruixing Zhang\, JQI post doc


Abstract: We propose MnBi(2n)Te(3n+1) as a magnetically tunable platform for realizing various symmetry-protected \;higher-order topology. Its canted ant iferromagnetic phase can host exotic topological surface states with a Mobi us twist that are protected by nonsymmorphic symmetry. Moreover\, opposite surfaces hosting Mobius fermions are connected by one-dimensional chiral hi nge modes\, which offers the first material candidate of a higher-order top ological Mobius insulator. We uncover a general mechanism to feasibly induc e this exotic physics by applying a small in-plane magnetic field to the an tiferromagnetic topological insulating phase of MnBi(2n)Te(3n+1) \, as well as other proposed axion insulators. For other magnetic configurations\, tw o classes of inversion-protected higher-order topological phases are ubiqui tous in this system\, which both manifest gapped surfaces and gapless chira l hinge modes. We systematically discuss their classification\, microscopic mechanisms\, and experimental signatures. Remarkably\, the magnetic-field- induced transition between distinct chiral hinge mode configurations provid es an effective “topological magnetic switch”.

Reference: \;arXi v:1910.11906 LAST-MODIFIED:20191111T140747Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180918T160000 DTEND;TZID=America/New_York:20180918T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20180918T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Jay Sau\, University of Maryland\n\nTitle: Towards r ealizing topological quantum physics in Condensed matter systems\n\nAbstrac t: Topology has become a guiding principle for discovering robust phenomena in quantum many-body physics. One of the most fascinating predictions of t hese principles is topological quantum computation\, which is rooted in top ological quantum field theory. I will start by reviewing briefly work that started during my postdoctoral research that led to the prediction of topol ogical quantum computation using Majorana modes. Then I will summarize the part of my current work that focuses on understanding the slew of experimen tal data resulting from our prediction and making new predictions to defini tively establish topological superconductivity and Majorana modes. In addit ion I will describe my results on existing experiments on other potentially topological superconducting systems. Following this I will discuss aspects of realizing parafermions\, which are a generalization of Majorana modes t hat have been suggested to arise at the interface of a fractional quantum H all and superconducting systems. Finally\, I will describe my most recent i nterest in the role of emergent gauge fields that arise in ultra-cold atomi c versions of the Majorana systems. Here we found interesting examples of i nteraction driven transitions that have low energy excitations that are nei ther Lorentz or Galilean invariant. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200410T170000Z DTEND:20200410T180000Z DTSTAMP:20260828T094430Z UID:6nn7d39uieqjti8p8482j0n4r6@google.com CREATED:20200122T134935Z DESCRIPTION:Speaker: TBA\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200408T175050Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200203T190000Z DTEND:20200203T200000Z DTSTAMP:20260828T094430Z UID:30laucnjona87loid71r13i4ba@google.com CREATED:20191211T165502Z DESCRIPTION:\n\nYu-An Chen\, Caltech\n\n\nTitle: \nExact bosonization in al l dimensions and the duality between fermionic SPT and higher-group bosonic SPT phases\n\nAbstract: \nThe first part of this talk will introduce gener alized Jordan–Wigner transformation on arbitrary triangulation of any manif old in 2d\, 3d\, and general dimensions. This gives a duality between all f ermionic systems and a new class of Z2 lattice gauge theories. This map pre serves the locality and has an explicit dependence on the second Stiefel–Wh itney class and a choice of spin structure on the manifold. In the Euclidea n picture\, this mapping is equivalent to introducing topological terms (Ch ern-Simon term in 2d or the Steenrod square term in general) to the Euclide an action. We can increase the code distance of this mapping\, such that th is mapping can correct all 1-qubit and 2-qubits errors and is useful for th e simulation of fermions on the quantum computer. The second part of my tal k is related to symmetry-protected-topological (SPT) phases. By the boson-f ermion duality\, we can show the equivalent between any supercohomology fer mionic SPT and higher-group bosonic SPT phases. Particularly in (3+1)D\, we have constructed a finite-depth local unitary quantum circuit for any supe rcohomology fermionic SPT state with gapped boundary construction. This fer mionic SPT state is derived by gauging higher-form Z2 symmetry in the highe r-group bosonic SPT and apply the boson-fermion duality. LAST-MODIFIED:20191211T165502Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181211T181500Z DTEND:20181211T191500Z DTSTAMP:20260828T094430Z UID:11m9sekko8qjr5um16os5rek4o@google.com CREATED:20181204T133135Z LAST-MODIFIED:20181204T133317Z LOCATION:IPST 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191010T123000 DTEND;TZID=America/New_York:20191010T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191010T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Quantum impulse control\nSpeaker: Christopher Jarzynski\ nUniversity of Maryland | Department of Chemistry & Biochemistry and Depart ment of Physics\n\nAbstract: The quantum adiabatic theorem governs the evol ution of a wavefunction under a slowly time-varying Hamiltonian. I will con sider the opposite limit of a Hamiltonian that is varied impulsively: a str ong perturbation U(x\,t) is applied over a time interval of infinitesimal d uration ε approaches 0. When the strength of the perturbation scales like 1 /ε^2\, there emerges an interesting dynamical behavior characterized by an abrupt displacement of the wave function in coordinate space. I will solve for the evolution of the wavefunction in this situation. Remarkably\, the s olution involves a purely classical construction\, yet describes the quantu m evolution exactly\, rather than approximately. I will use these results t o show how appropriately tailored impulses can be used to control the behav ior of a quantum wavefunction. LAST-MODIFIED:20191003T132957Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200221T170000Z DTEND:20200221T174000Z DTSTAMP:20260828T094430Z UID:0jef4qekdogtlbdr4hqal9e6rm@google.com CREATED:20200212T173552Z DESCRIPTION:Title: Density matrices: The good\, the bad and the alternative \nSpeaker: Amir Kalev\n\n(pizza and drinks served at 12pm\; talk starts at 12:10pm) \n\nAbstract: Density matrices represent our knowledge about quan tum systems. We can use them to calculate any physical property of quantum systems via the Born rule. Since the density matrix grows exponentially wit h the number of qubits\, already at about 50 qubits\, simply writing and st oring the density matrix in a classical computer\, becomes impossible\, let alone calculating anything with it. To be able to calculate physical prop erties of large quantum systems\, which become available to us with the rap id growth of quantum information processors\, we have to think of alternati ve methods and formulations. Our result represents one such alternative. In particular\, we provide a framework that allows one to estimate any physic al quantity of interest with a well-controlled error\, based on statistical inference. The error in the estimation depends on two factors: (1) a norm- like feature of the observable of interest and (2) standard statistical err or. Importantly\, the error does not have any intrinsic dependence on the n umber of qubits. Moreover\, in our method the size of the description of th e state scales linearly in the number of qubits instead of exponentially. T his highly efficient description implies the ability to store the informati on about the state and calculate physical quantities of interests for qubit systems\, in practice\, of a very large size. LAST-MODIFIED:20200212T173737Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200728T140000Z DTEND:20200728T150000Z DTSTAMP:20260828T094430Z UID:5r4fa6um384nil458j7mv9vg9t@google.com CREATED:20200720T210443Z DESCRIPTION:Speaker: Eun-Gook Moon (KAIST)\n\nTitle: Instability of j=3/2 B ogoliubov Fermi surfaces\n\nAbstract: Exotic quantum phases including topol ogical states and non-Fermi liquids may be realized by quantum states with total angular momentum j=3/2\, as manifested in HgTe and pyrochlore iridate s. Recently\, an exotic superconducting state with non-zero density of stat es of zero energy Bogoliubov quasiparticles\, Bogoliubov Fermi-surface (BG- FS)\, was also proposed in a centrosymmetric j=3/2 system\, protected by a Z2 topological invariant. Here\, we consider interaction effects of a centr osymmetric BG-FS and demonstrate its instability by using mean-field and re normalization group analysis. The Bardeen-Cooper-Schrieffer (BCS) type loga rithmical enhancement is shown in fluctuation channels associated with inve rsion symmetry. Thus\, we claim that the inversion symmetry instability is an intrinsic characteristic of a BG-FS under generic attractive interaction s between Bogoliubov quasiparticles. In drastic contrast to the standard BC S superconductivity\, a Fermi-surface may generically survive even with the instability. We propose the experimental setup\, a second harmonic generat ion experiment with a strain gradient\, to detect the instability. Possible applications to iron based superconductors and heavy fermion systems inclu ding FeSe are also discussed.\n\nEmail rcawthor@umd.edu for Zoom details. LAST-MODIFIED:20200720T210443Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201111T210000Z DTEND:20201111T223000Z DTSTAMP:20260828T094430Z UID:0lr0hgrutagq9bh5c1ekuj0vql@google.com CREATED:20201106T162400Z DESCRIPTION:



Title of Event: Challenging the Standard Model with the Belle II Experiment

https://umd.zoom.us/j/919439 06688?pwd=b2FEK2wwTldPNGNWRURQS2R5UW5Mdz09

Meeting ID: 919 4390 6688 \; \;Passcode: 214353

Speaker N ame: Alan Schwartz
Speaker Institution : University of Cincinnati

Abstract : The Belle experiment in Japan began taking data in the late 199 0’s and went on to record the world’s largest sample of B-anti-B meson pair s produced in a quantum correlated state. This data allowed Belle\, along w ith the BaBar experiment at SLAC\, to measure CP violation in B decays with good precision. This measurement and others have confirmed the Standard Mo del (SM)\, but other \;measurements have shown significant differences with the SM. To study these discrepancies with high statistics\, the Belle detector and accelerator complex have been upgraded to the Belle II experim ent\, which has recently begun taking data. The goal is to collect 50 ab-1 of data\, about 50 times that recorded by Belle. Such a large data set woul d allow one to search for new physics in a wide variety of B meson\, D meso n\, and t lepton decays. In this talk I'll present the physics program  \;of Belle II\, the current status of the experiment\, and the first physic s results obtained.

Host Name: Sally Megonigal
Host E-Mail: \ ;smegonig@umd.edu \; \; LAST-MODIFIED:20201106T162400Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Colloquia/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200921T200000Z DTEND:20200921T213000Z DTSTAMP:20260828T094430Z UID:5lu1fvhhq3al61gsnokvdogtfa@google.com CREATED:20200909T173743Z DESCRIPTION:Speaker: Dr. Rahul Sharma

Title: \;Determining the S ign of Superconducting Gap from Quasiparticle
Interference Imaging using Fourier Transform Scanning Tunneling
Spectroscopy. \; \;
&nb sp\; \;
Abstract:
A variety of probes exist to measure the magnit ude of
the superconducting gap but very few to measure the sign. In this
talk\, we will discuss how scanning tunneling spectroscopy can be used< br>to determine the sign of a superconducting gap. \; \;

Adv isor: Paglione Group

Zoom Link \; &\; \; \;Log In Information


https://umd.zoom.us/s/911980376 43

Meeting ID: 911 9803 7643 \;

Password:558484 \;< /p> LAST-MODIFIED:20200909T200408Z LOCATION:Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Rahul Sharma\, UMD TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201023T190000Z DTEND:20201023T203000Z DTSTAMP:20260828T094430Z UID:11fuj96c452k1f9nr4fh3e7i02@google.com CREATED:20201022T175055Z DESCRIPTION:

Speaker: \;Dr. Christopher Reynolds (Cambrid ge University)
Date: \; Friday\, October 23rd 2020
Time : \;3:00 p.m.
Location: \; \;Virtual via Zoom

 \;

"Particle Physics Beyond the Standard Model wi th Clusters of Galaxies" \;

Clusters of galaxies prov ide superb laboratories for exploring new particle physics. They represent the most massive dark matter objects in the Universe\, making them an impor tant laboratory for probing dark matter decay and annihilation signatures. However\, in this talk\, I will highlight how the transparency (or lack the reof) of the magnetized intracluster medium (ICM) to X-rays can be a powerf ul probe of axion-sector physics. I will present new data from the Chandra X-ray Observatory for the Perseus cluster which allows us to set constraint s on the existence of low-mass axion-like particles which exceed those poss ible from the next-generation laboratory and ground-based searches. I shall finish by discussing the future prospects and limitations of these studies .

Zoom Information
Join Zoom Meeting
https://umd. zoom.us/j/94962270899?pwd=NENQdC9NV3RKOEY2Y1FIbE1Lc243UT09

Meeting ID: 949 6227 0899
Passcode: jsitalk LAST-MODIFIED:20201022T175055Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium Series - Christopher Reynolds TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181026T160000Z DTEND:20181026T164500Z DTSTAMP:20260828T094430Z UID:0s758jn5j8tsb0481f3do126k3@google.com CREATED:20181019T144622Z DESCRIPTION:Title: Probing quantum phase transitions via quench dynamics\n\ nSpeaker: Paraj Titum\, JQI and QuICS\n\nAbstract: In this talk\, I will pr esent results from our recent work where we propose a practical way to prob e quantum phase transitions in integrable and nearly integrable quantum man y-body systems via quench dynamics. Our results are important for quantum s imulation experiments because\, in these experiments\, it is usually diffic ult to prepare ground states but easy to probe quench dynamics. We also inv ented a new technique called finite-time scaling that not only offers a num erical/experimental way of identifying dynamical critical points but also s heds light on the connection between equilibrium and non-equilibrium phase transitions.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181019T144647Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190423T180000Z DTEND:20190423T191500Z DTSTAMP:20260828T094430Z UID:5d9n8ih7i0ubovibcga13d8t63@google.com CREATED:20190130T021211Z DESCRIPTION:Title: Abelian and non-Abelian excitations in fracton phases of matter

Speaker: Michael Hermele (CU Boulder)

Abstract : Fracton phases of matter are a new class of quantum phases of matter char acterized by excitations that exhibit restricted mobility. These phases\, t he most interesting examples of which occur in three-dimensional systems\, have attracted recent interest in large part because they do not appear to fit into existing paradigms to characterize or classify quantum phases of m atter. In this talk\, I will first give a brief overview of fracton phases\ , and then discuss two recent works focusing on the excitations of fully ga pped fracton phases in three dimensions. First\, I will outline an approach to describe fusion and statistical processes in fracton phases with Abelia n excitations. Second\, I will describe a relatively simple fracton model s upporting non-Abelian excitations restricted to move along lines\, and demo nstrate that the restricted mobility and non-Abelian nature of these excita tions is a fundamentally three-dimensional phenomenon.

Host: Danny B ulmash

Condensed Matter Theory Center website:
http://www.physics.um d.edu/cmtc/seminars.html LAST-MODIFIED:20190415T145517Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20181119T200000Z DTEND:20181119T213000Z DTSTAMP:20260828T094430Z UID:2ca6po1nvdql8rh6guu3jnc0jj@google.com CREATED:20181031T143212Z DESCRIPTION:Title: Cooling self-interacting dark matter halos

Speake r: Yiming Zhong\, Boston University

Abstract: Dark sector models nat urally introduce elastic and dissipative self-interactions of dark matter. If such interactions exist\, the induced heat flow permits the gravothermal evolution of the halo: the inner halo firstly develops a core but ultimate ly becomes cuspy. Based on a semi-analytical fluid model calibrated with N- body simulations\, we find that a mild dissipative scattering can significa ntly accelerate the gravothermal evolution. Using near-field dwarf galaxies that exhibit a core-like dark matter density profile\, we derive novel con straints on the dissipative self-interactions.
LAST-MODIFIED:20181031T143212Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190207T210000Z DTEND:20190207T223000Z DTSTAMP:20260828T094430Z UID:26cie68nsbv7rh4lddlifefrt1@google.com CREATED:20190128T155627Z DESCRIPTION:Seung Lee\, Korea Institute for Advanced Study\n\nTitle: Contin uum Naturalness\n\n\nAbstract: Searches at the LHC have placed the naturaln ess paradigm under pressure. In this talk I will introduce a novel class of composite Higgs models in which the top and gauge partners responsible for cutting o ff the Higgs quadratic divergences form a gapped continuum. The new continuum states in this scenario cannot be described as Breit-Wigner r esonances\, drastically changing their LHC phenomenology. I will present a concrete example based on a warped extra dimension with a linear dilaton\, where this finite gap arises naturally\, and show that naturalness is impro ved compared to the case with usual resonance type of top partners for the same KK scale (say top partner mass around 2 TeV). LAST-MODIFIED:20190129T143520Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160829T110000 DTEND;TZID=America/New_York:20160829T120000 RRULE:FREQ=WEEKLY;UNTIL=20170508T150000Z;BYDAY=MO EXDATE;TZID=America/New_York:20160905T110000 EXDATE;TZID=America/New_York:20160912T110000 EXDATE;TZID=America/New_York:20161010T110000 EXDATE;TZID=America/New_York:20161107T110000 EXDATE;TZID=America/New_York:20161219T110000 EXDATE;TZID=America/New_York:20161226T110000 EXDATE;TZID=America/New_York:20170102T110000 EXDATE;TZID=America/New_York:20170109T110000 EXDATE;TZID=America/New_York:20170116T110000 EXDATE;TZID=America/New_York:20170123T110000 EXDATE;TZID=America/New_York:20170220T110000 EXDATE;TZID=America/New_York:20170313T110000 EXDATE;TZID=America/New_York:20170320T110000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: TBD\nTitle: TBD\nAbstract: TBD LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190322T170000Z DTEND:20190322T180000Z DTSTAMP:20260828T094430Z UID:63h6uukf3u6k3f7g7a6glb1n6q@google.com CREATED:20190124T142224Z LAST-MODIFIED:20190124T142224Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar-NO SEMINAR-SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190920T170000Z DTEND:20190920T180000Z DTSTAMP:20260828T094430Z UID:259a0qncfjctlsutkq7lil1kjc@google.com CREATED:20190905T132128Z DESCRIPTION:Speaker: Dr. Karen Swider-Lyons\, Director\, Laboratory for Aut onomous Systems Research\, U.S. Naval Research Laboratory\n\nTitle: The Imp ortance of Materials Porosity in Fuel Cell Performance at High Power and Us e of Hydrogen Fuel Cells in Unmanned Air Vehicles\n\nAbstract: Hydrogen fue l cells generate electricity directly from the electrochemical conversion o f hydrogen and the oxygen and air to water. The appeal of hydrogen fuel cel ls is that they can offer longer endurance than batteries\, because of the combination of the high efficiency electrochemical reactions with the high energy of hydrogen. They are now used commercially as the power source for forklifts and engines in the next generation of electric automobiles and tr ucks. \n\nEfficient electrocatalysis is often associated with a high perfor mance fuel cell\, but operation at high power is more based on the manageme nt of the product water of the electrochemical reaction must be ejected eff ectively from the fuel cell to allow for the ingress of new reactants. Dr. Swider-Lyons' talk will show how high power is affected by materials porosi ty in the fuel cell electrodes.\n\nShe will also talk about how high specif ic power and efficiency in hydrogen fuel cells is important to the next gen eration of unmanned air vehicles. LAST-MODIFIED:20190905T132128Z LOCATION:2108 Chem/Nuc Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191031T123000 DTEND;TZID=America/New_York:20191031T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191031T123000 CREATED:20190828T134015Z DESCRIPTION:Title: A putative mechanism for implicit learning in biological and artificial neural systems\nSpeaker: Zhixin Lu\nUniversity of Pennsylva nia | School of Engineering and Applied Science\n\nAbstract: The human brai n is capable of diverse feats of intelligence. A particularly salient examp le is the ability to implicitly learn dynamics from experiencing the physic al world. Analogously\, artificial neural systems such as reservoir computi ng (RC) networks have shown great success in learning the long-term behavio r of various complex dynamical systems from data\, without knowing the expl icit governing equation. Regardless of the marked differences between biolo gical and artificial neural systems\, one fundamental similarity is that th ey are essentially dynamical systems that are fine-tuned towards the imitat ion of other dynamical systems. To shed some light on how such a learning f unction may emerge from biological systems\, we draw inspiration from obser vations of the human brain to propose a first-principles framework explicat ing its putative mechanisms. Within this framework\, one biological or arti ficial dynamical system\, regardless of its specific composition\, implicit ly and adaptively learns other dynamical attractors (chaotic or non-chaotic ) by embedding the dynamical attractors into its own phase space through th e invertible generalized synchronization\, and imitates those attractors by sustaining the embedded attractors through fine-tuned feedback loops. To d emonstrate this general framework\, we construct several distinct neural ne twork models that adaptively learn and intimate multiple attractors. With t hese\, we observe and explain the emergence of five distinct phenomena remi niscent of cognitive functions: (i) imitation of a dynamical system purely from learning the time series\, (ii) learning of multiple dynamics by a sin gle system\, (iii) switching among the imitations of multiple dynamical sys tems\, either spontaneously or driven by external cues\, (iv) filling-in mi ssing variable from incomplete observations of a learned dynamical system\, and (v) deciphering superimposed input from different dynamical systems. LAST-MODIFIED:20190829T180058Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200227T123000 DTEND;TZID=America/New_York:20200227T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200227T123000 CREATED:20200109T211506Z DESCRIPTION:Title: Utilizing Noise to Alter Dynamic Response of Coupled Osc illator Arrays\nSpeaker: Gizem Acar\nUniversity of Maryland | Department of Mechanical Engineering\n\nAbstract: Noise has usually been considered as a n unwanted disturbance and considerable research has been done on noise red uction in dynamical systems over the past decades. Alternatively\, one can view noise as a means to alter the dynamic response of a nonlinear system. The nonlinear systems of interest are coupled oscillator arrays\, which ca n be used to describe rotary systems and energy harnessing systems. In the se systems\, response localizations can occur. With an appropriate choice o f initial conditions and harmonic input\, a coupled oscillator system can be excited to realize a periodic response\, wherein one or more oscillators oscillate with much higher amplitudes compared to the rest of the oscillat ors. This type of spatial localization of energy can be suppressed by intro ducing Gaussian noise into the system. In this talk\, we will focus on guid ing the system response between different periodic orbits realized for harm onic forcing\, through the addition of Gaussian noise in the input. We also explore how long it takes for the noise to suppress energy localization. LAST-MODIFIED:20200121T141404Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191113T160000Z DTEND:20191113T170000Z DTSTAMP:20260828T094430Z UID:241u6spqvfpdesud42g25loug1@google.com CREATED:20190903T170619Z LAST-MODIFIED:20191104T140413Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191120T160000Z DTEND:20191120T170000Z DTSTAMP:20260828T094430Z UID:77b89tkbp893oh5bdi6i7b1tn4@google.com CREATED:20190903T170714Z DESCRIPTION:Speaker: Siddharth Singh\, UMD

Title: Heterostructure Ph otocatalysts: An Avenue for Full Solar Spectrum Employment for Efficient Ph otocatalysis

Abstract: Increasing industrial pollution has led to de teriorating airand water quality. There is a need to find sustainable and e fficient means todegrade complex organic pollutants. Semiconductor photocat alysts are able touse solar light to produce reactive oxygen species that a re able to help breakdown these organic pollutants into simple molecules li ke CO2 and H2O.Complete utilization of solar light in the photocatalytic reaction is ofimmense importance for efficient conversi on of solar light. Although Visibleand IR light constitutes almost 90% of t he solar energy\, there are very fewefforts towards its effective utilizati on in photocatalysis. The difficulty ofthe usage of Visible and IR is its a ssociated low energetic photons\, which canlead to exciton generation only for low band-gap semiconducting systems\, whichis sometimes not enough to i nitiate photocatalytic process. Moreover\, thesetypes of systems have very fast charge recombination process. Assembling aheterojunction semiconductor photocatalysts is found to be an efficient meansof harvesting a major part of the solar spectrum. LAST-MODIFIED:20191114T153232Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200713T190000Z DTEND:20200713T200000Z DTSTAMP:20260828T094430Z UID:4dn4v3s74cviev94golq1sjrn0@google.com CREATED:20200625T103707Z DESCRIPTION:Speaker: Daniel Green\, UC San Diego\n\nSeminar will be conduct ed via zoom.\n\nTitle: Soft de Sitter Effective Theory\n\nAbstract: Underst anding the quantum evolution of a de Sitter universe on superhorizon scales is notoriously difficult. To address this challenge\, we introduce the So ft de Sitter Effective Theory (SdSET)\, which holds for superhorizon modes whose (comoving) momentum is far below the UV cutoff\, the (comoving) horiz on. SdSET makes power counting manifest while preserving the low energy sy mmetries\, simplifying many aspects of perturbation theory outside the hori zon. As an example\, we will give a simple derivations of the all orders c onservation of the adiabatic modes and gravitational waves. LAST-MODIFIED:20200709T163048Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201023T140000 DTEND;TZID=America/New_York:20201023T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201023T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96514239009?pwd=bkpqS1V5Nnl4Qi9ML21TYVVWWVdYUT09#success

Speaker: Silas Beane\, University of Washington

Title: Geometry and entanglement in the scattering matrix

Abstract: Using the nucleon-nu cleon system as an example\, I will motivate and discuss a geometrical form ulation \;of scattering in which the fundamental object is the S-matrix itself\, rather than the effective field theory action. \;In this form ulation of scattering\, spacetime plays no role\; rather\, the S-matrix is a trajectory on a compact theory \;space whose properties are primarily determined by unitarity. \; Several consequences of this new theory of
scattering will be presented. LAST-MODIFIED:20201019T134828Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201211T170000Z DTEND:20201211T174500Z DTSTAMP:20260828T094430Z UID:3klq6s9aleprsr5vrpb91oups6@google.com CREATED:20201202T211058Z DESCRIPTION:
Title : Exact bosonization in all dimensions

Speaker : Yu-An Chen

Time : 12 - 12:45pm\, Friday\, Dec. 11



Seminar will be held via Zoom: https://umd.zoom.us/j/97099328991 and Meeting ID : 970 993 2 8991


This talk will introduce genera lized Jordan–Wigner transformation on arbitrary triangulation of any simply connected manifold in 2d\, 3d and general dimensions. This gives a duality between all fermionic systems and a new class of lattice gauge theories. T his map preserves the locality and has an explicit dependence on the second Stiefel–Whitney class and a choice of spin structure on the manifold. In t he spacetime picture\, this mapping is exactly equivalent to introducing to pological terms (Chern-Simon term in 2d or the Steenrod square term in gene ral) to the Euclidean action. We can increase the code distance of this map ping\, such that this mapping can correct all 1-qubit and 2-qubits errors o n 2d square lattice\, which is useful for the simulation of fermions on the quantum computer. I will also show how this duality is useful in the const ruction of fermionic symmetry protected topological phases. LAST-MODIFIED:20201202T211058Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190424T180000Z DTEND:20190424T193000Z DTSTAMP:20260828T094430Z UID:0cche1rbntbkbp56iare1if202@google.com CREATED:20190129T151819Z DESCRIPTION:Sarah Wesolowski\, Salisbury\n\nTitle: Reliable effective field theory predictions in low-energy nuclear physics using Bayesian statistics \n\nAbstract: High-precision calculations at low to medium masses across th e nuclear chart have become possible in this decade due to steady progress in ab-initio many-body methods. A central input to these methods comes from chiral effective field theory (EFT)\, which describes the dynamics of the nucleus at low energies in terms of nucleon and pion degrees of freedom and which is now the most widely used method to derive nuclear interactions. T he fundamental promise of EFT power-counting\, that observable calculations can be improved systematically\, is central to the popularity of chiral EF T for nuclear calculations. However\, chiral interactions suffer from a ran ge of issues: from not being fully renormalized to a lack of knowledge of t he precise energy scales where they should be used. Using Bayesian statisti cal approaches\, we are exploring different facets of EFT interactions\, wh ich are the limiting input for the precision of nuclear calculations. In pa rticular\, we have developed a novel framework for the estimation of EFT lo w-energy constants (LECs) that explicitly incorporates theoretical uncertai nty and expectations into the fitting process. We have also built a statist ical model using Gaussian Processes to estimate EFT truncation errors and e xplore correlations between EFT calculations of truncation error in scatter ing observables. A major value-added of a statistical model for theoretical errors is that we have developed validation tools that can be used to dete ct physics issues with EFT interactions. These efforts are aimed at two maj or goals: Estimating a full theoretical uncertainty for nuclear structure a nd reaction calculations\; and using data and statistics to detect physics issues and to provide additional guidance for theory practitioners. LAST-MODIFIED:20190416T130419Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191106T210000Z DTEND:20191106T223000Z DTSTAMP:20260828T094430Z UID:36g0jatc7stmtaprjv0b1at7lm@google.com CREATED:20191030T151104Z DESCRIPTION:Title : "GAPS: Searching for Dark Matter with Cosmic-ray Antinu clei"
Speaker Name: Mengjiao Xiao
Speaker Institution : Massachusetts Institute of Technology

Abstract : The General Antiparticle Spectro meter (GAPS) is a balloon-borne experiment
designed to identify cosmic a nti-nuclei\, in particular antideuterons from dark
matter annihilation o r decay\, using the uniquely characterized atomic X-rays and
charged par ticles from the decay of exotic atoms. With such a novel detection
appro ach\, benefitting from a custom-developed large-area silicon tracker and a< br>large-acceptance time-of-flight system\, GAPS is sensitive to antideuter ons with
kinetic energy <\;0.25 GeV/nucleon\, which should offer an es sentially backgroundfree region to probe various dark matter models. Additi onally\, one long duration
balloon flight allows GAPS to collect a high- statistics antiproton spectrum in an
unexplored energy range.
The fir st flight of GAPS is scheduled for 2021 from Antarctica. This talk will pre sent
the science impact of the GAPS experiment\, while focusing on the d etection
principle\, conceptual design\, details of construction status and the path forward

to the initial flight.

 \;smegonig@ umd.edu LAST-MODIFIED:20191030T151104Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190325T110000 DTEND;TZID=America/New_York:20190325T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190325T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Fresh news from Flatland: Testing scale invariance in th e lab\n\nSpeaker: Jean Dalibard\, Laboratoire Kastler Brossel and Collège d e France\n\nAbstract: A fluid is said to be scale-invariant when its intera ction and kinetic energies have the same scaling in a dilatation operation. This symmetry\, in association with the more general conformal invariance\ , has profound consequences on the equilibrium properties of the fluid as w ell as its dynamics. \n\nIn this talk\, I will present recent experimental investigations of this phenomenon using an initially uniform\, two-dimensio nal gas of rubidium atoms that is suddenly immersed in a harmonic potential . I will show an unexpected result for this setup: There exist specific ini tial shapes that lead to a periodic evolution of the system\, corresponding to "breathers" of the two-dimensional Gross-Pitaevskii equation. I will co nclude with a possible generalization of such phenomena to other scale inva riant fluids. LAST-MODIFIED:20190304T012345Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190221T123000 DTEND;TZID=America/New_York:20190221T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190221T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Quantum Lyapunov Spectrum\nSpeaker: Brian Swingle\nUnive rsity of Maryland | Department of Physics\n\nAbstract: Positive Lyapunov ex ponents are one of the key characteristics of chaos in classical dynamical systems. Here we discuss the notion of Lyapunov exponents in quantum many-b ody systems focusing on a recent definition of a whole spectrum of quantum Lyapunov exponents (https://arxiv.org/abs/1809.01671). The talk will not as sume prior knowledge of the subject\, although some knowledge of quantum me chanics will be helpful. LAST-MODIFIED:20190115T154141Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190926T193000Z DTEND:20190926T203000Z DTSTAMP:20260828T094430Z UID:11v7rdbrpsekduu88o54hpjfn0@google.com CREATED:20190925T142823Z DESCRIPTION:Title: Topological phases in the real world

Speaker: Yi- Ting Hsu (CMTC\, Maryland)

Abstract: Topological phases are exotic q uantum matters that have non-trivial topological nature in their electronic properties\, which often result in robust quantization in bulk transports and excitations localized on the boundary. In low-dimensional topological s uperconductors\, the boundary excitations are dubbed “Majorana modes” for b eing their own antiparticles\, and have been proposed as a promising candid ate for qubits in quantum computation. Yet\, materials hosting topological superconductivity are rare to date. I will discuss examples of how to desig n and search for material candidates for various types of topological super conductors by exploiting the interplay between topology and symmetry.

Condensed Matter Theory Center website:
http://www.phys ics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190925T142823Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181102T160000Z DTEND:20181102T164500Z DTSTAMP:20260828T094430Z UID:6hhp0msnelgmpkabee9rhic125@google.com CREATED:20181022T203827Z DESCRIPTION:Title: Photonic Interfacing of Trapped Ions and Neutral Atoms\n \nSpeaker: John Hannegan\, JQI and ARL\n\nAbstract: Building future hybrid quantum networks will require interfacing different types of quantum system s. Photonic interconnects between such systems have rarely been investigate d due to difficulties such as spectral mismatch. In this talk\, I will disc uss our progress on interfacing photons emitted from a trapped ion with neu tral rubidium atoms. Using quantum frequency conversion\, we convert 493 nm single photons emitted from a trapped 138 Ba ion to a Rb-resonant 780 nm\, whilst still preserving the quantum statistics of the photons. Sending the se photons through a heated 87 Rb cell\, we observe slowed light\, demonstr ating the first interaction between neutral atoms and photons emitted from a single trapped ion. This interaction also provides a tunable means to syn chronize photon arrival times emitted from distant trapped ion nodes in a q uantum network.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181030T140841Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190502T123000 DTEND;TZID=America/New_York:20190502T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190502T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Cluster Synchronization in Multilayered Networks\nSpeake r: Louis Pecora\nNaval Research Laboratory\n\nAbstract: The behavior of dyn amical systems (nodes or oscillators) that are coupled together in complex networks are greatly affected by the structure of those networks. Various p atterns of synchronization among subsets of nodes are possible when the net work has symmetries and input or balanced partitions. Symmetries and partit ions will be introduced in this talk along with the dynamical patterns they can support. The basic machinery from group theory will be used to analyze the patterns\, especially for their dynamical stability. The main portion of the talk will be about extending these ideas to networks with multiple o scillator types called multilayered networks. This extension while looking straightforward has some interesting structures that govern the behavior of synchronous clusters in the network as a whole as well as the symmetries o f the network. LAST-MODIFIED:20190426T142018Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201028T200000Z DTEND:20201028T213000Z DTSTAMP:20260828T094430Z UID:3oh867igmcu9d75ogme9mhlde7@google.com CREATED:20201023T195205Z DESCRIPTION:Title : "Dual Readout Calorimeter for future lepton colliders"
Speaker Name: Sarah C. Eno
Speaker Institution : University of Maryl and
Notes: https://umd.zoom.us/j/91943906688?pwd=b2FEK2w wTldPNGNWRURQS2R5UW5Mdz09

Meeting ID: 919 4390 6688

Passcode: 214353

Abstract : The discovery of the Higgs boson by the CMS and ATLAS experiments opened a new frontier in particle physics. The H iggs is the only fundamental scalar in the standard model\, is responsible for electroweak symmetry breaking\, and determines the masses of the quarks . However\, the Higgs mass still suffers from the "naturalness" problem\, and the connection of the Higgs to dark matter is unknown. Future proposed lepton colliders can probe the Higgs couplings to the level required to pr obe these questions if jets are measured with unprecedented resolution. I n this talk\, I discuss a new twist on dual readout calorimetry that can gi ve both the required jet energy resolution and state-of-the-art electromagn etic resolution. LAST-MODIFIED:20201023T195205Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190510T160000Z DTEND:20190510T164000Z DTSTAMP:20260828T094430Z UID:7peg423su0ii7uqiv9qvl3kvc0@google.com CREATED:20190502T162715Z DESCRIPTION:Title: Interactions of Optical Vortices with Sub-Wavelength Qua ntum Systems\n\nSpeaker: Andrei Afanasev\, George Washington University Dep artment of Physics\n\nAbstract: Quantized optical vortices\, or the twisted photons\, may carry pre-set amounts of angular momentum along their direct ion of propagation\, thus allowing for quantum transitions otherwise forbid den for conventional plane-wave light. In this talk I will address the ques tion of the angular momentum transfer to internal degrees of freedom of qua ntum systems excited by the twisted photons\, and discuss appropriate polar ization observables. We will show that interactions of such beams generate parity-conserving single-spin asymmetries due to presence of an orbital ang ular momentum\, showing in circular dichroism even in\nthe isotropic atomic matter. We extend our theory approach to the case of semi-conductors\nand demonstrate associated spin-orbit effects for spin injection of photoelectr ons in bulk GaAs. The developed formalism was confirmed experimentally for twisted photoexcitation of cold trapped 40Ca+ ions in Mainz University.\n\n Notes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190502T162715Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200921T200000Z DTEND:20200921T210000Z DTSTAMP:20260828T094430Z UID:33g2ibbgorr2pivnsh8mnqjj7c@google.com CREATED:20200826T160356Z DESCRIPTION:Speaker: \;Rob Phillips\, \;California Institute of Technology

Title: Deciphering the Genomic R osetta Stone \; \;

Abstract: \;
The ability to read the DNA sequences of different organisms has transformed biology in m uch the same way that the telescope transformed astronomy. And yet\, much o f the sequence found in these genomes is as enigmatic as the Rosetta Stone was to early Egyptologists. \; With the aim of making steps to crack th e genomic Rosetta Stone\, I will describe unexpected ways of using the phys ics of information transfer first developed at Bell Labs for thinking \ ;about telephone communications to try to decipher the meaning of the regul atory features of genomes. Specifically\, I will show how we have been able to explore genes for which we know nothing about how they are regulated by using a combination of mutagenesis\, deep sequencing and the physics of in formation\, with the result that we now have falsifiable hypotheses about h ow those genes work. With those results in hand\, I will show \;how sim ple tools from statistical physics can be used to predict the level of expr ession of different genes\, followed by a description of precision measurem ents used to test those predictions. \;Bringing the two threads of the talk together\, I will think about next steps in reading and writing genome s at will. \; \;

Topi c: Biophysics Seminar
Time: Sep 21\, 2020 04:00 PM Easter n Time (US and Canada) \;  \;
Join Zoom Meeting
https: //umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvU T09
Meeting ID: 926 8220 2606
Passcode: 741889< /font> LAST-MODIFIED:20200922T142728Z LOCATION:Online seminar -- Zoom meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190917T171500Z DTEND:20190917T181500Z DTSTAMP:20260828T094430Z UID:30vb95ger0tncggl3cgntb3oju@google.com CREATED:20190910T134911Z LAST-MODIFIED:20190910T134930Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190425T123000 DTEND;TZID=America/New_York:20190425T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190425T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Controlling dynamical systems using a deep reservoir com puter\nSpeaker: Daniel Gauthier\nOhio State University | Department of Phys ics\n\nAbstract: I will describe the design of a smart controller for dynam ical systems based on reservoir computers. I use this approach to control fixed points\, unstable period orbits\, and arbitrary orbits for the Lorenz chaotic system. We have also applied the controller to other systems\, su ch as a mathematical model of a drone (quadcopter). The controller to easi ly adopt to a partial degradation of the system allowing the drone to maint ain stable flight. I will discuss our progress on using this approach to c ontrolling the dynamics of a chaotic electronic circuit. LAST-MODIFIED:20190307T185734Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201218T180000Z DTEND:20201218T190000Z DTSTAMP:20260828T094430Z UID:385mjrb90ipcvs8cfvc9vnd79n@google.com CREATED:20201207T154334Z LAST-MODIFIED:20201207T154342Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190429T190000Z DTEND:20190429T203000Z DTSTAMP:20260828T094430Z UID:6cvdagsce8goevq0o89j98gake@google.com CREATED:20190129T144436Z DESCRIPTION:

Simon Knapen\, IAS \;

 Title: Directional detection of light dark matter with athermal phon ons

Abstract: Upcoming sensor technology allows for dark matter dire ct detection all the way down to the warm dark matter limit of ~ 10 keV. At such low masses\, the usual nuclear recoil picture breaks down\, as the da rk matter recoils against athermal phonon modes instead. I will show how th e rate for these processes can be calculated and why superfluid helium and polar materials are good targets for this type of dark matter. In the latte r case the crystal axis can provide a daily modulation of the scattering ra te. LAST-MODIFIED:20190423T190403Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181029T203000Z DTEND:20181029T213000Z DTSTAMP:20260828T094430Z UID:2usecp5m6k16194o9b00i8k9vv@google.com CREATED:20181011T171418Z DESCRIPTION:Title: Wave generation and heat flux suppression in astrophysic al plasma systems\n\nSpeaker: Gareth Roberg-Clark\, Department of Physics\, University of Maryland\n\nAbstract: Heat flux suppression in collisionless plasmas for a large range of plasma β is explored using two-dimensional pa rticle-in-cell simulations with a strong\, sustained thermal gradient. We f ind that a transition takes place between whistler-dominated (high-β) and d ouble-layer-dominated (low-β) heat flux suppression. Whistlers saturate at small amplitude in the low beta limit and are unable to effectively suppres s the heat flux. Electrostatic double layers suppress the heat flux to a mo stly constant factor of the free streaming value once this transition happe ns. The double layer physics is an example of ion-electron coupling and occ urs on a scale of roughly the electron Debye length. The scaling of ion hea ting associated with the various heat flux driven instabilities is explored over the full range of β explored. The range of plasma-βs studied in this work makes it relevant to the dynamics of a large variety of astrophysical plasmas\, including the intracluster medium of galaxy clusters\, hot accret ion flows\, stellar and accretion disk coronae\, and the solar wind.\n\nNot es: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20181011T172630Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200303T181500Z DTEND:20200303T191500Z DTSTAMP:20260828T094430Z UID:3ap89oq8he9np15s0fv9ip87ua@google.com CREATED:20200122T140331Z LAST-MODIFIED:20200224T143430Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190916T110000 DTEND;TZID=America/New_York:20190916T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20190916T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Can you make a magnet out of carbon?\n\nSpeaker: David G oldhaber Gordon\, Stanford\n\nAbstract: In most materials\, electrons fill bands\, starting from the lowest kinetic energy states. The Fermi level is the boundary between filled states below and empty states above. This is th e basis for our understanding of how metals and semiconductors work. But wh at if all the electrons within a band had the same kinetic energy (this sit uation is called a "flat band")? Then electrons could arrange themselves so as to minimize their Coulomb repulsion\, giving rise to a wide variety of possible states including superconductors and magnets. Until recently\, fla t bands were achieved only by applying large magnetic fields perpendicular to a 2D electron system\; in this context they are known as Landau levels. Fractional quantum hall effects result from Coulomb-driven electron interac tion within a Landau level. Recently\, Pablo Jarillo-Herrero of MIT and cow orkers demonstrated flat minibands in graphene-based superlattices\, discov ering correlated insulators and superconductors at different fillings of th ese minibands. We have now discovered dramatic magnetic states in such sup erlattice systems. Specifically\, in magic-angle twisted bilayer graphene w hich is also aligned with a hexagonal boron nitride (hBN) cladding layer\, we observe a giant anomalous Hall effect as large as 10.4 kΩ\, and signs of chiral edge states. This all occurs at zero magnetic field\, in a narrow d ensity range around an apparent insulating state at 3 electrons (1 hole) pe r moire cell in the conduction miniband [1]. Remarkably\, the magnetization of the sample can be reversed by applying a small DC current. Although the anomalous Hall resistance is not quantized\, and dissipation is significan t\, we suggest that the system is an incipient Chern insulator\, a type of topological insulator similar to an integer quantum Hall state. In a quite different superlattice system\, ABC-trilayer graphene aligned with hBN\, ag ain near 3 electrons (1 hole) per moire cell a Chern insulator emerges [2]. This time the flat band is a valence miniband\, and a magnetic field of or der 100 mT is needed to quantize the anomalous hall signal. This trilayer s ystem can be tuned in-situ to display superconductivity instead of magnetis m [3]. We will discuss possible magnetic states\, complementary probes to e xamine which state actually emerges as the ground state in each system\, an d what one might do with such states.\n\n[1] A.L. Sharpe et al.\, “Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene”\, Science 365\, 6453 (2019).\n[2] G. Chen et al.\, “Tunable Correlated Chern Insulator and Ferromagnetism in Trilayer Graphene/Boron Nitride Moire Super lattice”\, arXiv:1905.06535 (2019).\n[3] G. Chen et al.\, “Signatures of tu nable superconductivity in a trilayer graphene moiré superlattice”\, Nature 572\, 215 (2019). LAST-MODIFIED:20190916T180047Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200128T181500Z DTEND:20200128T191500Z DTSTAMP:20260828T094430Z UID:4h3luq2ll1b1p5soou6u01o943@google.com CREATED:20200121T163931Z DESCRIPTION:Speaker: Professor Tim Mueller\, Johns Hopkins University\n\nTi tle: Bayesian Cluster Expansions and Algorithms for Generating Efficient K- Point Grids\n\nAbstract: Cluster expansions are generalized Ising models th at are commonly used to model materials with substitutional disorder. I wil l demonstrate how cluster expansions can be efficiently constructed from ab -initio calculations using a physically-based Bayesian approach inspired by statistical learning theory\, allowing their application to increasingly c omplex material systems. I will present applications of this approach to na noparticles and alloy catalysts. The examples will include a demonstration of how Bayesian cluster expansions that depend on the lattice parameter can be used to create maps of near-surface structure and catalytic activity at every point in an alloy phase diagram\, enabling researchers to identify t he synthesis conditions likely to result in highly active catalysts. I will also discuss optimal ways for sampling the Brillouin zone with highly effi cient k-point grids. Grids generated using our algorithms roughly double th e speed of well-converged calculations on crystalline materials compared to traditional Monkhorst-Pack grids. I will present both the underlying physi cal justification for our approach and a set of software tools that impleme nt our algorithms and are freely available to the research community. LAST-MODIFIED:20200121T164411Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200222T000000Z DTEND:20200222T013000Z DTSTAMP:20260828T094430Z UID:28h5kij4ctdr468ufsua1pum5c@google.com CREATED:20200204T173351Z DESCRIPTION:Physics is Phun LAST-MODIFIED:20200204T173351Z LOCATION:1410 and 1412\, Toll Physics Building\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Physics of Fantastic Worlds TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190507T171500Z DTEND:20190507T181500Z DTSTAMP:20260828T094430Z UID:6q1e5oabtb0a2hlbv6q144lhbj@google.com CREATED:20190205T175612Z LAST-MODIFIED:20190205T175612Z LOCATION:IPST 1116 Conference Room (Bldg. #085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190222T170000Z DTEND:20190222T174000Z DTSTAMP:20260828T094430Z UID:0g1hp31hjvrra6rv0apjdvvs8a@google.com CREATED:20190215T165431Z DESCRIPTION:Title: Weak-link Josephson Junctions Made from Topological Crys talline Insulators\n\nSpeaker: Rodney Snyder\, JQI\n\nAbstract: We report o n the fabrication of Josephson junctions using the topological crystalline insulator Pb_0.5 Sn_0.5 Te as the weak link. The properties of these juncti ons are characterized and compared to those fabricated with weak links of P bTe\, a similar material yet topologically trivial. Most striking is the di fference in the ac Josephson effect: junctions made with Pb_0.5 Sn_0.5Te ex hibit a rich subharmonic structure consistent with a skewed current-phase r elation. This structure is absent in junctions fabricated from PbTe. A disc ussion is given on the origin of this effect as an indication of novel beha vior arising from the topologically nontrivial surface state. \n\nDOI:http s://doi.org/10.1103/PhysRevLett.121.097701\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190215T165707Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181207T170000Z DTEND:20181207T174500Z DTSTAMP:20260828T094430Z UID:0qgif8rv77e76vkslo9ct3pna3@google.com CREATED:20181129T221912Z DESCRIPTION:Title: Machine Learning Techniques for State Recognition and Au to-tuning in Quantum Dots\n\nSpeaker: Sandesh Kalantre\, JQI/QuICS\n\nAbstr act: Progress in scaling up quantum computing implementations has led to a new set of technical challenges - development of classical control techniqu es to initialize and control these systems. Control problems in one such im plementation\, quantum dots defined in semiconductor heterostructures\, cur rently rely on gross scale heuristics from experiments. Fortunately\, machi ne learning techniques for pattern recognition and image classification\, u sing deep and convolutional neural networks (CNN)\, have shown surprising s uccesses for a computer-aided understanding of complex systems. I will pres ent our work [1\,2] on using these techniques to characterize states and ch arge configurations of quantum dots. Using this characterization networks\, we can recast the problem of tuning quantum dot devices to a required stat e as an optimization problem. We propose a closed-loop system of experiment al control using a large\, labelled simulated dataset\, CNN-based learner\, and numerical optimization techniques to automatically tune the quantum do t device. I will describe the application of these techniques to experiment s as well as outline future problems for larger systems to be tackled with machine learning.\n\n[1] Kalantre et. al.\, arXiv:1712.04914\n[2] Zwolak et . al..\, PLOS ONE 13\, e0205844 (2018)\, arXiv:1809.10018\n\nNotes: Lunch s erved at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181129T221912Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181119T203000Z DTEND:20181119T213000Z DTSTAMP:20260828T094430Z UID:03au3mlq1g3c815e7vp5nh7dn6@google.com CREATED:20181113T175313Z DESCRIPTION:Title : Kinetic Entropy as a Diagnostic for Magnetic Reconnecti on\n\n\nSpeaker: Haoming Liang\, West Virginia University \n\nAbstract : Ki netic entropy is the entropy defined using kinetic theory for plasmas that are not necessarily in local thermodynamic equilibrium. Entropy is a natura l metric of irreversible dissipation since it is conserved in ideal isolate d systems and increases only when there is dissipation. It should be especi ally important in many heliospheric systems\, where collisions can be rare so that plasmas are not in thermodynamic equilibrium. This suggests kinetic entropy can address important unsolved questions on the nature of irrevers ible dissipation in fundamental plasma processes such as magnetic reconnect ion\, plasma turbulence and collisionless shocks. While entropy is often in vestigated in fluid and gyrokinetic systems\, it is vastly underutilized in fully kinetic systems. In this work\, we carry out an initial study to dev elop and apply the kinetic entropy diagnostic in particle-in-cell (PIC) sim ulations. We start with 2.5D collisionless anti-parallel reconnection. In t he simulations\, we calculate the commonly-used kinetic entropy written as the phase space integral of – f ln f\, where f is the distribution function \, and the full Boltzmann entropy related to the logarithm of the number of microstates for a specific macrostate. By decomposing kinetic entropy into a sum of velocity space and position space entropies\, we show that positi on space entropy decreases while velocity space entropy increases during ma gnetic reconnection. We find that total kinetic entropy in the simulations is preserved quite well (better than three percent) and use the departure f rom exact conservation to quantify the effective numerical dissipation. Ele ctrons and ions have slightly different effective collision frequencies. Fi nally\, we use kinetic entropy to identify regions with non-Maxwellian dist ributions and compare the results with other approaches. Note\, our work us es collisionless simulations\, so we cannot yet address physical dissipatio n mechanisms\; nonetheless\, the infrastructure developed here will be usef ul for future studies in weakly collisional systems. It is being applied to Magnetospheric Multiscale (MMS) data. LAST-MODIFIED:20181113T175313Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200225T181500Z DTEND:20200225T191500Z DTSTAMP:20260828T094430Z UID:0l8cgcpu2pfqf32mhnq3f1gsuv@google.com CREATED:20200122T132913Z DESCRIPTION:Speaker: Professor Oren Raz\, Weizmann Institute\, Rehovot\, Is rael\n\nTitle: Faster Heating by Pre-Cooling Protocols\n\nAbstract: What is the fastest way to heat a system which is coupled to a temperature control led oven? The intuitive answer is to use only the hottest temperature avail able. In the talk I will show you that often it is possible to achieve an e xponentially faster heating protocol\, and that surprisingly\, this protoco l can have a pre-cooling stage - cooling the system before heating it short ens the heating time significantly. To demonstrate such improvements in man y-body systems\, we developed a projection-based method with which such pro tocols can be found in large systems\, as we demonstrate on the 2D antiferr omagnet Ising model. LAST-MODIFIED:20200217T141029Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181011T170000Z DTEND:20181011T183000Z DTSTAMP:20260828T094430Z UID:3j7f57kseumqk4r2i37m10gcvf@google.com CREATED:20180828T143505Z DESCRIPTION:\nTitle: Nucleon electric dipole moments from Lattice QCD\n\nSp eaker: Sergey Syritsyn. Stony Brook\n\nAbstract: Experimental observation o f nucleon electric dipole moments (nEDMs) would be evidence of nonzero QCD theta-term or CP violating (CPv) interactions beyond the Standard model. CP violation is a prerequisite for baryogenesis and is necessary for explaini ng the baryon asymmetry of the Universe. Experimental bounds on nEDMs can c onstrain the QCD theta term and effective quark-gluon CP-violating interact ions. Taken together with the observed amount of nuclear matter\, they can help select and constrain viable extensions of the Standard model.\nIn orde r to relate experimental bounds on nEDMs to limits on quark-gluon CPv inter actions\, theoretical nucleon structure calculations are necessary. Nonpert urbative QCD calculations on a lattice have reached a respectable level of statistical and systematic precision for hadron spectrum and many nucleon s tructure observables such as the axial charge and form factors. However\, p roducing correct and reliable results for nucleon EDMs on a lattice has pro ved numerically (and theoretically) challenging. In this talk\, I will over view the current status and recent results of lattice calculations of nEDMs induced by the QCD theta term and by the lowest-dimension quark-gluon CPv interactions. Lattice QCD is poised to yield model-independent connection b etween nEDMs and quark-gluon CPv interactions\, and I will discuss the outl ook for computing these quantities with physical quark masses. LAST-MODIFIED:20180926T165942Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191209T150000 DTEND;TZID=America/New_York:20191209T163000 DTSTAMP:20260828T094430Z UID:2l9tc5asm03r3ii7rlt0v7tpjo@google.com RECURRENCE-ID;TZID=America/New_York:20191209T150000 CREATED:20191114T160034Z DESCRIPTION:Speaker: Masha Baryakhtar\, NYU\n\nTitle: Searching for Ultral ight Bosons with Black Hole Superradiance\n\nAbstract: The LIGO detection of gravitational waves has opened a new window on the universe. I will disc uss how the process of superradiance\, combined with gravitational wave mea surements\, makes black holes into nature's laboratories to search for new light bosons\, from axions to dark photons. When a bosonic particle's Compt on wavelength is comparable to the horizon size of a black hole\, superradi ance of these bosons into bound states extracts energy and angular momentum from the black hole. The occupation number of the levels grows exponential ly and the black hole spins down. One candidate for such an ultralight boso n is the QCD axion with decay constant above the GUT scale. Current black h ole spin measurements disfavor a factor of 30 (400) in axion (vector) mass\ ; future measurements can provide evidence of a new boson. Ongoing searches at LIGO may unveil thousands of monochromatic gravitational wave signals f rom boson annihilations\, while self-interactions of axions source semi-rel ativistic axion waves that can be observed in future dark matter experiment s. LAST-MODIFIED:20191205T170552Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201204T140000 DTEND;TZID=America/New_York:20201204T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201204T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96514239009?pwd=bkpqS1V5Nnl4Qi9ML21TYVVWWVdYUT09#success

Speaker: Saurabh Kadam\, UMD


Title:

Towards Matchi ng the Double-β Decay Amplitude In Effective Field Theory to Lattice QCD

Abstract:
The ongoing search for neutrinoless double β proce ss (0νββ) is crucial for determining the Majorana nature of neutrinos. To r elate the rate of these processes with the underlying standard model (SM) a nd beyond standard model (BSM) interactions\, the corresponding nuclear mat rix elements must be constrained reliably from theory. Further\, precise in formation about the decay rate of its SM counterpart\, two-neutrino double β decay (2νββ)\, is useful for the background estimation in 0νββ decay sear ch experiments.

We present here a way to constrain these double β de cay amplitudes using lattice quantum chromodynamics (LQCD). The Minkowski i nfinite volume amplitudes containing two-hadrons with two-weak current inse rtions is constructed with and without an intermediate Majorana neutrino pr opagator in the pionless effective field theory\, corresponding to 0νββ and 2νββ processes\, respectively. A formalism is then provided to constrain t hese amplitudes using LQCD four-point correlation functions in Euclidean an d finite-volume spacetime. LAST-MODIFIED:20201130T191400Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190918T150000Z DTEND:20190918T160000Z DTSTAMP:20260828T094430Z UID:7o9mcrc46l39dk04q57u1bm6pp@google.com CREATED:20190903T165142Z DESCRIPTION:Speaker: Thomas Klar\, Johannes Kepler University\n\nTitle: Fro m STED Nanoscopy via STED Nanolithography to STED Photochemistry\n\nAbstrac t: Stimulated emission depletion (STED) microscopy proved to break the diff raction limit of resolution. Besides\, it was proposed already in the early experimental reports that the STED-confined excitation volume should be ap plicable to spatially control chemical reactions on the nanometer scale.1 R ecently\, this prediction has been experimentally realized in the field of optical nanolithography.2-4 Using negative tone resists based on acrylates or methacrylates\, three dimensional structures with sizes of around 55 nm in all three spatial directions can be written with visible light of 500 to 800 nm wavelength.5 This clearly breaks the diffraction limit and not only allows for writing three dimensional structures but also to use low quantu m energies\, less harmful to organic matter than those of deep UV-light or electron- or ion beams. Applications include the design of three dimensiona l nano-environments for biomedical and physiological research. Multicompone nt structures comprising some parts which are protein repellant and other p arts (“nanoanchors”) which catch proteins or antibodies will be discussed.6 -8 Yet\, negative tone lithography is only a very special case of photochem istry. An outlook will be given how to extrapolate diffraction unlimited st ructuring to nano-localized photochemistry\, the far-goal being optically t riggered covalent binding to the nanoscopic spot. . LAST-MODIFIED:20190910T134730Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191105T210000Z DTEND:20191105T220000Z DTSTAMP:20260828T094430Z UID:4g1f46lmq722dvejjd01m9kgvk@google.com CREATED:20190910T150739Z DESCRIPTION:\nSpeaker: Emanuel Derman\, Columbia University\n\nTitle: A S tylized History of Quantitative Finance\n\nAbstract: The evolution of a qua ntitative approach to finance has proceeded through many small but signific ant steps and occasional large epiphanies. This talk outlines how\, over th e past 70 years\, financial models have quantified the notion of derivative s\, diffusion\, risk\, volatility\, the riskless rate\, diversification\, h edging\, replication\, and the principle of no riskless arbitrage. LAST-MODIFIED:20190923T131751Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200226T160000Z DTEND:20200226T170000Z DTSTAMP:20260828T094430Z UID:7iohbd82n6eb5rivqd6fofk5ie@google.com CREATED:20200122T142912Z DESCRIPTION:Speaker: Matthew Leonard Literature Seminar\n\nTitle: Phase Tra nsitions of Explosives with Varying Pressure and Temperature\n\nAbstract: T BA LAST-MODIFIED:20200219T150259Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200311T150000Z DTEND:20200311T160000Z DTSTAMP:20260828T094430Z UID:026qnagj2ud4u8m3k6md6ia533@google.com CREATED:20200122T143114Z LAST-MODIFIED:20200302T151825Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200922T171500Z DTEND:20200922T181500Z DTSTAMP:20260828T094430Z UID:4efc1lkikr7d282lu471fopd43@google.com CREATED:20200915T162254Z DESCRIPTION:Speaker: Andrew Ferguson\, University Chicago

Title: Dee p Learning in Protein Folding: Trajectory Reconstruction and Ultra-Fast Sim ulators

Abstract: \;The integration of data-driven techniques wi th domain expertise has opened new paradigms and opportunities in understan ding and engineering of protein folding. In the first part of this talk\, I will describe an approach integrating ideas from dynamical systems theory\ , manifold learning\, and deep learning to reconstruct atomistic protein fo lding trajectories from one-dimensional time series in experimentally measu rable observables. In the second part of this talk\, I will describe our de velopment of latent space simulators to perform molecular simulations at si x orders of magnitude lower cost than molecular dynamics by stacking specia lized deep learning networks to (i) encode a molecular system into a slow l atent space\, (ii) propagate dynamics in this latent space\, and (iii) gene ratively decode a synthetic molecular trajectory. \; \;

ZOOM : \;https://umd.zoom.us/j/98477648942?pwd=VWlqZWJlYkVCaERqQVp5cXN lV2hVQT09 LAST-MODIFIED:20200917T152700Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190515T180000Z DTEND:20190515T193000Z DTSTAMP:20260828T094430Z UID:007ql97rg63gb357iasuflq443@google.com CREATED:20190129T150346Z DESCRIPTION:Luchang Jin\, University of Connecticut\n\nTitle: Lattice calcu lation of the hadronic light-by-light contribution to the \nmuon magnetic m oment\n\nAbstract: The muon anomalous magnetic moments (g-2) have been meas ured (BNL \nE821) and calculated to a precision (0.54 ppm)\, that it may be used to\nprobe new physics at a much higher energy scale not reachable by the\npresent-day accelerators. The on-going experiment at Fermilab (E989)\n and the future J-PARC experiment (E34) are aiming to reduce the\nexperiment al uncertainty by a factor of four. The lattice calculation\nof the hadroni c light-by-light contribution to muon g-2 is crucial to\nreduce the theoret ical uncertainty to a similar level. We have already\ncalculated the connec ted diagrams and the leading disconnected\ndiagrams using the RBC/UKQCD $48 ^3 \\times 96$ ensemble with physical\npion mass and 5.5 fm box size. I wil l report our recent progress on\ntaking the continuum and infinite volume l imits\, which are the two\nmajor systematics in our previous calculation. LAST-MODIFIED:20190419T145939Z LOCATION:PSC 3150 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201019T183000Z DTEND:20201019T200000Z DTSTAMP:20260828T094430Z UID:22r6c3fbr8t1mn04foijcdpiqo@google.com CREATED:20201014T142642Z DESCRIPTION:

Email Rcawthor@umd.edu for Zoom details \;

2:40pm - The duality between fermionic supercohomology SPT andbosoni c 2-groupSPT phases in (3+1)D

Speaker:Yu-An Chen

Abst ract: Symmetry-protectedtopological (SPT) phases of matter are describe d by short-range entangledstates. For each bosonic SPT phase described by t he group cohomology\, there isa fixed-pointstate that can be prepared by a finite depth quantum circuit (FDQC) built fromthe correspondingcohomology d ata. In this talk\, I will describe a generalization for (3+1)D intrinsical lyinteracting fermionic SPT phases known as the supercohomology phases. The derivationof the FDQC utilizes a series of exact lattice dualities that re late bosonicSPT phases witha certain 2-group symmetry to supercohomology ph ases. A quick overview is thatgauging theZ2 1-form symmetry of a bosonic mo del gives a Z2 lattice gauge theory\, andbosonizing a fermionicmodel also g ives a Z2 lattice gauge theory. With careful design\, these Z2lattice gauge theoriescan match\, and this constructs a duality between certain bosonic and fermionicmodels. Theideas of "gauging 1-form symmetry" and "bosonizatio n (gaugingfermion parity)" will be clearlyexplained. A primary result of th is approach is that the “symmetryfractionalization” on fermionparity flux l oops is immediate\, which is the characteristic of supercohomologyphases. R eference:https://arxiv.org/abs/2008.05652

 \;

3:10pm - On the theoretical ability to identify topological wiresbased on transpo rtmeasurements of three terminal and Coulomb blockaded devices

Spe aker:Jay Sau

Abstract:I will report on work done in the Ma ryland group on modeling transportmeasurement onMajorana nanowires. While t he simple single channel effective model for such awire can reproducetwo te rminal end conductance qualitatively by introducing a few fit parameters\,i t also indicatesthat uncertainties in the potential landscape leads to the possibility of two non-topologicalscenarios (so-called "bad" and "ugly") th at can potentiallyproduce qualitatively similarend conductance results as p redicted for the topological case. This makes itcrucial to understandif oth er characterization measurements would be more reliable in being able to id entifytopological nanowires. Motivated by such measurements\, I will first discuss our comparisonof three terminal measurements to the topological inv ariant in Majoranananowires. Threeterminal devices allow measurement of 2 l ocal and 2 non-local conductances aswell as a thermalcross-conductance. The latter two classes of measurements allow\, in principle\,an estimateof the "gap" of a wire. The correlation of closing and reopening of agap with the appearanceof zero-bias peaks is expected to be strong evidence for a topol ogical phase.We examinethis claim by contrasting simulations of these measu rements with a theoretical calculationof the topological invariant. I will also report on our modeling of Coulombblockade transportwhere we assume tha t the lead-wire coupling is weak enough to allowthermalization ofthe Majora na wire. This approximation allows an efficient calculation ofCoulomb block ade transportin a semi-realistic nanowire model that includes strong coupli ng effects of thewire to thebulk superconductor\, end quantum dot potential landscapes\, large number oflevels near the criticalpoint as well as near the end of superconductivity. In addition to themagnitude of the splittingw e attempt to extract information from the intensity profile such as the bri ght-dark-brightfeatures in the intensity. Reference:Based on joint works wi th Sankar Das Sarma and CMTC students Haining Pan andYi-Hua Lai respectivel y.

 \;

3:40pm - Student Introductions

< b>4:10pm - Discussion


LAST-MODIFIED:20201014T142642Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181012T170000Z DTEND:20181012T180000Z DTSTAMP:20260828T094430Z UID:120ot66d7s2jadkhgtnh879903@google.com CREATED:20180905T150625Z DESCRIPTION:Speaker: Marina Leite\, Assistant Professor\, Materials Science &\; Engineering\, UMCP

Title: LIGHT\, MATERIALS\, interACTION: A n Overview of the Leite Lab

Abstract: Dr. Leite's research gr oup is engaged in fundamental and applied research in novel materials for e nergy harvesting and storage\, nanophotonics and optoelectronics. The perfo rmance of most photovoltaic devices is still limited by their nanoscale beh avior. To reveal how the electrical and optical responses vary at relevant length scales\, Leite's group acquire nanoscale resolved “photographs” and “movies” of the performance of inhomogeneous materials for photovoltaics\, by means of novel nanospectroscopic methods. Their measurements provide a t omography of charge carrier generation\, recombination\, and collection wit hin materials ranging from well-established thin films to emerging perovski tes. In particular\, the team probes the correlation between perovskites’ s tability and the chemical changes that occur when the material is exposed t o humidity\, oxygen\, temperature\, light\, and bias. In the realm of energ y storage\, the further development of rechargeable\, safe batteries requir es the understanding of why and how the material is changing upon charging/ discharging. Leite's team elucidates the dynamics of lithiation/delithiatio n in all-solid-state batteries through in situ electron microscopy methods to ultimately identify and control undesired chemical reactions that lead t o capacity fade. Concerning optical materials\, they overcome the constrain t imposed by the pre-defined dielectric functions of metals by alloying\, w here they've recently developed a library of their optical properties. Thei r approach enables new materials with on demand optical response for applic ations ranging from electrocatalysis to superabsorbers and color displays.& nbsp\; LAST-MODIFIED:20181008T125424Z LOCATION:Chem/Nuclear Engineering Room 2108 Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190522T150000Z DTEND:20190522T160000Z DTSTAMP:20260828T094430Z UID:1qlnb45a22iand6npgbbej3vk1@google.com CREATED:20190514T123200Z DESCRIPTION:Speaker: Nicholas P. Stadie\, Montana State University\n\nTitle : Surface Homogeneity as a Guiding Principle in Physisorptive Energy Storag e Materials\n\nAbstract: Homogeneity is a key factor in materials design of effective energy storage materials across numerous technologies. For physi sorptive energy storage (e.g.\, of gas or fluid fuel on a \nporous surface or ion storage on a porous electrode)\, this implies that the material surf ace\nshould be as homogeneous as possible with respect to structure and che mical composition.\nWe demonstrate the effect of structural heterogeneity o n deliverable gas storage by\ninvestigating methane adsorption on the surfa ce of several porous carbon materials\nincluding activated carbons and zeol ite-templated carbon (ZTC). The principles underlying\neffective methane ad sorption on ZTC can readily be extended to other gases\, and also to ion\ns torage in supercapacitors or other electrochemical energy storage devices. LAST-MODIFIED:20190514T123200Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PChem/ANE/ChemPhys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190625T150000Z DTEND:20190625T170000Z DTSTAMP:20260828T094430Z UID:24ksg3oikkaear7j0iaj97h5pa@google.com CREATED:20190624T200445Z DESCRIPTION:Alessia Platania\, Heidelberg University\n\nTitle: Gravitationa l RG flows: from non-perturbative renormalizability to singularity resoluti on\n\nAbstract:According to the "Asymptotic Safety conjecture"\, first post ulated by Weinberg\, quantization of gravity might result in a (non-perturb atively) renormalizable quantum field theory\, whose high-energy limit is d etermined by a non-trivial fixed point of the gravitational renormalization group flow. The corresponding scale-invariant regime implies an effective weakening of the gravitational interaction at high energies. This anti-scre ening behavior might have important consequences in astrophysics and cosmol ogy. After reviewing the key ideas of the theory\, in this talk I will disc uss some phenomenological consequences of Asymptotically Safe Gravity\, mos tly focusing on the modifications induced by the running of the gravitation al couplings in a black-hole interior and in the early evolution of the uni verse. LAST-MODIFIED:20190624T200549Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181017T150000Z DTEND:20181017T160000Z DTSTAMP:20260828T094430Z UID:5jecjjr9dfbv42stdvgooabp1j@google.com CREATED:20180905T135008Z DESCRIPTION:Speaker: Dr. Jeff Fagan\, NIST

Title: An Insid e Story: Controlling\, Separating\, and Characterizing the Effects of Filli ng the Interior of Nanotubes


Abstract: Single- wall carbon nanotubes (SWCNTs) are among the most studied nanomaterials\, w ith almost two decades of work in generating dispersion and separating popu lations by SWCNT species\, enantiomeric handedness and length. An emergent direction in SWCNT research is to additionally control what is in the inte rior volume of a SWCNT\, with the purpose to modify its material properties by changing the local dielectric environment\, or to carry cargo molecules for specific functions. In my lab at NIST\, we’ve demonstrated that SWCNT s with open ends can be readily filled with a wide variety of organic molec ules through simple liquid exposure. Ingestion of these molecules affects the extrinsic environment experienced by the SWCNT\, and holds promise for controlled modulation of intrinsic SWCNT properties such as optical linewid th narrowing\, transition energy tailoring and fluorescence enhancement. H owever\, the effect to the SWCNT properties for the same filler molecule ca n be non-uniform across filler and SWCNT (n\,m) combinations due to finite host and guest sizes and other higher order effects. In this talk I will p resent first the general modulation of SWCNT properties through endohedral volume control\, drill down into the careful characterization of sieving an d size effects using (n\,m) separated samples\, and finally discuss charact erization using analytical ultracentrifugation of the accessible volume siz e\, and alkane packing density in\, moderate diameter nanotubes. LAST-MODIFIED:20181011T144851Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181101T180000Z DTEND:20181101T193000Z DTSTAMP:20260828T094430Z UID:6ji78o0c1m35qi47g99102fi6i@google.com CREATED:20180823T193452Z DESCRIPTION:Title: Scale-Invariant transport in high-temperature supercondu ctors\n\nSpeaker: Arkady Shekhter\, NHMFL\n\nAbstract: \nThe origin of the anomalous transport behavior and the nature of charge carriers in the "stra nge metal" state are among the most pressing open questions in the high-tem perature superconductors. We have performed a series of high-magnetic-filed transport measurements in LSCO cuprates superconductor near critical dopin g (x=0.20). The observed magnetoresistance is linear-in-field at high magne tic fields (up to 93T) in a broad range of temperatures. This\, together wi th a linear-in-temperature resistivity at zero field\, suggests scale-invar iant behavior of magneto-transport in a broad range of temperatures and mag netic fields. Such scale-invariant transport behavior is incompatible with Fermi surface quasiparticle transport in the strange metal state. \n\nHost: Greene\n\nRefreshments Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181008T123002Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Arkady Shekhter\, NHMFL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190501T150000Z DTEND:20190501T160000Z DTSTAMP:20260828T094430Z UID:37b64p163q4b9dp6ddrjasrno7@google.com CREATED:20190124T135803Z DESCRIPTION:Speaker: Professor Greg Scholes\, Princeton University

T itle: TBA LAST-MODIFIED:20190124T135803Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190924T160000Z DTEND:20190924T173000Z DTSTAMP:20260828T094430Z UID:0unj241ih5mmlrcqogc6ej1ehl@google.com CREATED:20190920T110503Z DESCRIPTION:Title: Cold atoms in Industry\nSpeaker: Dana Anderson\, ColdQua nta\, Inc\nHost: Charles Clark LAST-MODIFIED:20190920T110503Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Career Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200420T200000Z DTEND:20200420T213000Z DTSTAMP:20260828T094430Z UID:2rf6kh8gdhq37l5e3aahhpkbu0@google.com CREATED:20200106T142151Z DESCRIPTION:Seminar will be conducted through zoom.\n\nPrateek Agrawal\, Ha rvard\n\n\nTitle: A CMB Millikan Experiment with Axion Strings\n\n\nAbstrac t: Very light axions are a generic prediction of string compactifications. If cosmic strings associated with these axions were produced in the early u niverse\, they quickly approach a so-called scaling solution\, such that st rings persist in the sky today. I will present some remarkable signals of s uch strings coupled to photons. In this string background\, there is a mode l-independent polarization rotation of CMB photons equal to $\\alpha_{em}$ up to a rational number. This manifests itself as a conversion of E-modes t o B-modes in the CMB polarization. The current CMB experimental sensitivity to this rotation is about 1%\, with many orders of magnitude improvement e xpected for future experiments. I will show how measuring the undetermined rational number will shed light on the quantization of electric charge in t he standard model. These strings may also be visible in strongly lensed qua sar systems. LAST-MODIFIED:20200416T140259Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200904T170000Z DTEND:20200904T180000Z DTSTAMP:20260828T094430Z UID:0fu7bvnju67rmpgvo24m1pdvqg@google.com CREATED:20200831T170950Z DESCRIPTION:

MSE Seminar: Research Safety in the New Normal: Integrating COVID Priorities &\; Navigating Catch 22s


Speaker: Mary D orman\, \;UMD Assistant Director for Environment al Safety

Friday\, September 4\, 2020
1:00 p.m.
via Zoom\; contact Sherri Tatum
statum12@umd.edu
https://mse.umd.edu/seminar-series


LAST-MODIFIED:20200903T190718Z LOCATION:https://mse.umd.edu/events SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200911T170000Z DTEND:20200911T180000Z DTSTAMP:20260828T094430Z UID:4odudpd2gvo8g9vp1gk3ndhcen@google.com CREATED:20200903T125959Z DESCRIPTION:

Speaker: \;John C. Mauro\, Professor\, MSE\, The Pennsylvania State University

Title: \;Relaxation is Every where

Abstract: \;As a nonequilibrium material\, glass is continually relaxing towards its metastable supercooled liquid state. A com prehensive understanding of glass relaxation is of critical importance for many high-tech applications of glass\, including optical fiber\, glass subs trates for liquid crystal displays\, and chemically strengthened cover glas s for electronic devices.

In this presentation\, Dr. Mauro will r eview the current state-of-the-art in understanding the dynamics of glass r elaxation\, including the physical origins of its non-Arrhenius and non-exp onential characters. \;

Bio:

John C. Mauro is professor and associate head for graduate education in the Department of Materials Scien ce and Engineering at The Pennsylvania State University. He earned a B.S. i n Glass Engineering Science (2001)\, B.A. in Computer Science (2001)\, and Ph.D. in Glass Science (2006)\, all from Alfred University. He joined Corni ng Incorporated in 1999 and served in multiple roles there\, including Seni or Research Manager of the Glass Research department\, where he led a group of15 scientists and technicians in the development of new glass and glass- ceramic products. John joined the faculty at Penn State in 2017 and is curr ently a world-recognized expert in fundamental and applied glass science\, statistical mechanics\, computational and condensed matter physics\, thermo dynamics\, and the topology of disordered networks.

John is the inven tor or co-inventor of several new glass compositions for Corning\, includin g Coming Gorilla® Glass products. John is a pioneer in the use of physics-b ased and machine learning models for the design of new glassy materials. He is the inventor of new models for supercooled liquid and glass viscosity\, glass structure and topology\, relaxation behavior\, and thermal and mecha nical properties. He is co-author ofFundamentals ofInorganic Glasses\,& nbsp\;3rd \;ed. (Elsevier\, 2019)\, the definitiv e textbook on glass science and technology. John is also author of the fort hcoming textbook\, \;Materials Kinetics\, \;to be publishe d by Elsevier in 2021.

John was awarded the N.J. Kreidl Award (2006) from the American Ceramic Society\, Glass and Optical Materials Division. I n 2010\, Penn State University and the International Commission on Glass (I CG) awarded John the W.A. Weyl International Glass Science Award. In 2011\, John received the V. Gottardi Prize from the ICG\, and in 2012 he was sele cted as the inaugural recipient of the Sir Alastair Pilkington Award from t he Society ofGlass Technology. In 2013\, John was awarded the S. Donald Sto okey Award for Exploratory Research from Coming Incorporated. In 2015\, Joh n became a Fellow of the American Ceramic Society and was recipient of the R.M. Fulrath Award. In the same year\, he was also awarded the W.H. Zachari asen Award from the \;Journal ofNon-Crystalline Solids.&nb sp\;In 2016\, the National Institute of Ceramic Engineers (NICE) selec ted John as winner of the Karl Schwartzwalder Professional Achievement in C eramic Engineering (PACE) Award. John is also winner ofComing's Ethnically Diverse Group ofEmployees (EDGE) Excellence Award (2016) for promoting dive rsity at Coming.

Most recently\, John was elected as a Fellow of the Society ofGlass Technology (2019) and is recipient of the Faculty of the Ye ar Award (2019) at Penn State Materials Science and Engineering. John is th e author of more than 275 peer-reviewed publications and has given over 300 presentations at international conferences and seminars. His publications have been cited over 10\,000 times\, with an \;h­ \;index of47. John has 53 granted U.S. patents and ~25 additional patents pending. John is Editor of the \;Journal of the American Ceramic Society&nbs p\;and Associate Editor of the \;International Journal ofAppli ed Glass Science. \;He also serves as an Editorial Board member fo r the \;Journal ofNon-Crystalline Solids \;and wa s a Volume Organizer for \;MRS Bulletin.

Where: \;via Zoom\, \;Sherri Tatum\, \;statum12@um d.edu

LAST-MODIFIED:20200903T125959Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190313T190000Z DTEND:20190313T203000Z DTSTAMP:20260828T094430Z UID:28lb8ceftu1fd4o2mg34qdv2s9@google.com CREATED:20190307T142938Z DESCRIPTION:Alessandra Buonanno\, UMD\n\nTitle: Probing the nature of gravi ty and compact objects with gravitational wave observations\n\nAbstract: Th e observation of gravitational waves from coalescing binary black holes and a binary neutron star with LIGO and Virgo detectors is providing us\, for the first time\, with the opportunity to probe gravity and compact objects in the highly dynamical\, strong-field regime. After reviewing the tests of GR performed so far with gravitational-wave detectors\, I will discuss how those observations can be used to place constraints on an effective-field- theory extension of GR where higher-order curvature corrections are include d in the gravitational-field action\, and how black-hole spectroscopy can b e used in the near future to study the uniqueness properties of black holes in GR. LAST-MODIFIED:20190307T142938Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190205T160000 DTEND;TZID=America/New_York:20190205T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190205T160000 CREATED:20180727T143919Z DESCRIPTION:\nSpeaker: Charles Tahan\, Technical Director\, Laboratory for Physical Sciences\n\nTitle: The Laboratory for Physical Sciences: Past\, Pr esent\, and Future\n\nAbstract: For over 60 years the Laboratory for Physic al Sciences\, in partnership with the University of Maryland\, has advanced the physics and engineering behind information science and technology. A u nique organization where university\, industry\, and federal government sci entists collaborate on research in advanced communication\, sensing\, and c omputer technologies\, the LPS currently houses four main divisions: Solid- State and Quantum Physics\, Optical and RF Innovations\, Microelectronics I ntegration\, and Advanced Computing Systems. In this talk I will review the current interests and possible future directions of LPS while interjecting some of the unique history and impact that the Lab and UMD have shared ove r the years. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200401T150000Z DTEND:20200401T160000Z DTSTAMP:20260828T094430Z UID:06j264sj7p4kml31d4urjclp6s@google.com CREATED:20200122T143433Z DESCRIPTION:Speaker: Tim Berkelbach\, Columbia and Flatiron Institute\n\nTi tle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200326T173702Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190328T180000Z DTEND:20190328T193000Z DTSTAMP:20260828T094430Z UID:1hf8m7tk4g4eeebntv36v3oviu@google.com CREATED:20190204T145502Z DESCRIPTION:Title: The Strange Metal State of the Electron-Doped Cuprates\n Speaker: Richard Greene\, UMD \nAbstract: \nAn understanding of the high-te mperature copper oxide (cuprate) superconductors has eluded the\nphysics co mmunity for over 30 years\, and represents one of the greatest unsolved pro blems in\ncondensed matter physics. Particularly enigmatic is the normal st ate from which the\nsuperconductivity emerges\, so much so that this phase has been dubbed a “strange metal”. In this\ntalk\, I will review recent res earch into this strange metallic state as realized in the electron-doped\n( n-type) cuprates with a focus on their transport properties. In particular\ , I will show and discuss\nmeasurements of resistivity\, Hall Effect\, magn etoresistance and thermopower in the n-type\ncuprate La 2-x Ce x CuO 4 for 0.19≥ x ≥0.08 as a function of temperature. The surprising new and\nunconve ntional results are:\n1) The normal state magnetoresistance exhibits an ano malous linear-in-H behavior [1] at the\nsame doping and temperature where a linear-in-T resistivity was previously observed for H>\;H c2\n[2]\, i.e. above the Fermi surface reconstruction at x =0.14 up to the end of the sup erconducting\n“dome” (x ~ 0.175). For doping beyond the “dome” conventional Fermi liquid behavior is found\n(with a surprising “spin”).\n2) The normal state Seebeck coefficient\, S/T\, exhibits an unconventional low temperatu re –lnT\ndependence at the same doping where linear-in-T and linear-in-H re sistivity is found [3].\nConventional S/T = constant behavior is found abov e the superconducting dome.\n3) The normal state resistivity above Tc\, fro m 80 K to 400 K\, follows an anomalous ~A(x)T 2\nbehavior at zero field for all doping(x) [4].\nI conclude that conventional Fermi liquid theory canno t explain any of these results and they\nremain an outstanding challenge to theory. Moreover\, the magnitude of the anomalous low\ntemperature resisti vity\, magnetoresistance and thermopower scales with Tc\, suggesting that t he\norigin of the superconductivity is correlated with the anomalous normal state properties.\nIf time allows I will discuss our surprising discovery of static Ferromagnetism beyond the\nsuperconducting dome [5].\n\nResearch done in collaboration with Drs. Tara Sarkar\, Pampa Mandal\, and Josh Higgi ns and\nundergraduate Nick Poniatowski.\n\n1. T. Sarkar et al.\, arXiv\;181 0.03499\, accepted in Sci. Adv. 2019.\n2. K. Jin et al. \, Nature 476\, 73 (2011).\n3. P. R. Mandal et al.\, arXiv: 1810.06511\, accepted in PNAS 2019 .\n4. T. Sarkar\, R. L. Greene\, and S. Das Sarma\, Phys. Rev. B 98\, 22450 3 (2018).\n5. T. Sarkar et al.\, arXiv: 1902.11235\, submitted to Science.\ nHost: Local LAST-MODIFIED:20190313T202730Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Richard Greene\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191203T210000Z DTEND:20191203T220000Z DTSTAMP:20260828T094430Z UID:2ot22tveb64u81jmanv0jvln02@google.com CREATED:20190829T202614Z DESCRIPTION:Speaker: Dr. John Doyle\, Harvard University

Title:&nbs p\;Trapped laser-cooled molecules for particle physics using quantum too ls \;

Abstract: \;Due to the versatility and controll able complexity of cold polar molecules\, they are a powerful platform for precision measurement searches of physics beyond the standard model (BSM). This\, and their use for quantum information applications\, has led to inte nse efforts to control molecules at the quantum level. In particular\, prec ision searches for new particle physics beyond the Standard Model (BSM)\, i ncluding new cosmology-related physics\, is an area of significant focus fo r the physics community. The most recent ACME experiment\, which probes for the electron electric dipole moment\, is sensitive to T-violating physics due to particles with masses up to 30 TeV\, which is a mass scale already w ell beyond the reach of particle colliders. Thus\, EDM experiments\, which broadly probe new CP-violating physics\, are an important complement collid er experiments. Several EDM experiments currently use heavy diatomic molecu les (e.g. YbF \, HaF+ \, ThO) to probe this BSM physics\, Diatomic molecule s are being planned for use in several next-generation and new experiments searching for BSM physics. I will give an update on the ACME EDM experiment \, which last year produced a new limit on the electron EDM and is moving f orward with another upgrade. I will also discuss possible future experiment s using ultracold polyatomic molecules such as YbOH and YbOCH$_3$. It is pr edicted that when laser-cooled and trapped optically\, such species will pr ovide long coherence times\, opening the possibility for future experiments to probe BSM physics at the PeV scale. Finally\, use of ultracold molecule s for dark matter searches will also be discussed. \; LAST-MODIFIED:20191118T173920Z LOCATION:PSC Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190220T160000Z DTEND:20190220T171500Z DTSTAMP:20260828T094430Z UID:2gtfh5sdvrvp6c1rgdg93v5r4c@google.com CREATED:20190213T140123Z DESCRIPTION:Alpha-bits\, Teleportation and Black Holes\nQuICS Seminar\n\nSp eaker: Geoff Penington (Stanford) \nTime: Wednesday\, February 20\, 2019 - 11:00am \nLocation: PSC 3150 \nThe theory of alpha-bits is a natural genera lisation of approximate quantum error correction that proves fundamental to the study of asymptotic quantum communication resources. In particular\, i t leads to an asymptotically reversible version of quantum teleportation\, called zero-bit teleportation\, which decomposes qubits of communication in to correlation and transmission components. Alpha-bit codes also appear whe n studying entanglement wedge reconstruction in AdS/CFT\, where they imply that the reconstruction of the bulk operators is both state-dependent and\, necessarily\, only approximate. Similar ideas may help resolve the black h ole information paradox. LAST-MODIFIED:20190213T140123Z LOCATION:PSC 3150: QuICS Seminar - Geoff Penington SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 3150: QuICS Seminar - Geoff Penington TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191024T163000Z DTEND:20191024T173000Z DTSTAMP:20260828T094430Z UID:34tig3oc1rvk41v90rb33nvikf@google.com CREATED:20191017T181411Z DESCRIPTION:Title: Observations of Laminar Chaos\nSpeaker: Rajarshi Roy\nUn iversity of Maryland | Department of Physics and IREAP and IPST\n\nAbstract : TBD LAST-MODIFIED:20191021T194741Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190403T140000Z DTEND:20190403T153000Z DTSTAMP:20260828T094430Z UID:136e7jifo1robmbo79rpre1f21@google.com CREATED:20190328T175927Z DESCRIPTION:Tom Faulkner\, University of Illinois at Urbana-Champaign\n\nTi tle: Recovering the QNEC from the ANEC \n\nAbstract: tk LAST-MODIFIED:20190330T124607Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Joint Gravity/QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201022T180000Z DTEND:20201022T193000Z DTSTAMP:20260828T094430Z UID:54e8k9rafdvee534u1f5g0tvif@google.com CREATED:20200831T161615Z DESCRIPTION:Speaker: Yong-Baek Kim\, University of Toronto
Title: Non-Fe rmi Liquids and Novel Broken Symmetries in Multipolar Quantum Materials

Abstract:
The hallmarks of non-Fermi liquids are singular thermodyna mic and transport properties that are distinct from those associated with a Fermi liquid. Non-Fermi liquid behaviors are famously seen in cuprates\, h eavy fermion materials\, and metallic quantum critical systems. In this tal k\, I discuss possible non-Fermi liquids in multipolar quantum materials\, where conduction electrons interact with the local moments that do not carr y any dipole moment\, but possess higher-rank quadrupolar and octupolar mom ents. This theoretical work is partly motivated by recent experiments on cu bic f-electron systems\, where the local moments arise from non-Kramers gro und states. I present the theoretical solution of a multipolar Kondo proble m\, where a single multipolar moment is interacting with the orbital and sp in degrees of freedom of conduction electrons. I show that an unexpected no n-Fermi liquid state arises in this system. I also discuss emergent multipo lar ordered phases in the lattice version of the model and how to experimen tally detect such subtle broken symmetries.
Host: J. Paglione

Lin k: https://umd.zoom.us/j/91251230757?pwd=MkhFREJrUXNTekVZTTRGQ244M1VB Zz09
Meeting ID: 912 5123 0757
Password: 558484 LAST-MODIFIED:20201009T153104Z LOCATION:Colloquium via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Yong-Baek Kim\, University of Toronto TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190306T190000Z DTEND:20190306T203000Z DTSTAMP:20260828T094430Z UID:0hfo7s5he4g00t5m8807g9untd@google.com CREATED:20190129T150027Z DESCRIPTION:Nicole Vassh\, Notre Dame\nTitle: Fission and lanthanide produc tion in r-process nucleosynthesis\nAbstract:The observations of the GW17081 7 electromagnetic counterpart last year suggested lanthanides were produced in this neutron star merger event. Lanthanide production in heavy element nucleosynthesis is subject to large uncertainties from nuclear physics and astrophysics unknowns. Specifically\, the rare-earth abundance peak\, a fea ture of enhanced lanthanide production at A~164 seen in the solar r-process residuals\, is not robustly produced in r-process calculations. The propos ed dynamical mechanism of peak formation requires the presence of a nuclear physics feature in the rare-earth region which may be within reach of expe riments performed at\, for example\, the CPT at CARIBU and the upcoming FRI B. To take full advantage of such measurements\, we employ Markov Chain Mon te Carlo to "reverse engineer" the nuclear masses capable of producing a pe ak compatible with the observed solar r-process abundances and compare dire ctly with experimental mass data. Here I will present our latest results an d demonstrate how the method may be used to the learn which astrophysical c onditions are consistent with both observational and experimental data. Unc ertainties in the astrophysical conditions also make it difficult to know i f merger events are responsible for populating the heaviest observed nuclei \, the actinides. Here I will discuss a potential direct signature of actin ide production in merger environments. However\, an r-process which reaches the actinides is also likely to host fission\, which is largely experiment ally uncharted for neutron-rich nuclei. The influence of fission on lanthan ide abundances\, and the potential for future experimental and theoretical efforts to refine our knowledge of fission in the r-process\, will be discu ssed. The question of where nature primarily produces the heavy elements ca n only be answered through such collaborative efforts between experiment\, theory\, and observation. LAST-MODIFIED:20190219T192408Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201005T110000 DTEND;TZID=America/New_York:20201005T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201005T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Programmable Quantum Simulation of Molecular Vibr ational Spectra using Boson Sampling in Circuit QED

Speaker: Steve G irvin\, Yale \;

Abstract: \; ‘Circuit QED’ is the quantum th eory of superconducting qubits strongly interacting with microwave photons in electrical circuits. It is the leading solid-state architecture in the r ace to develop large-scale fault-tolerant quantum computers\, and is the on ly technology that has demonstrated quantum error correction that actually extends the lifetime of quantum information. \; \;

In this t alk\, I will present an elementary introduction to the basic concepts under lying superconducting quantum processors. Their ability to control and make quantum non-demolition (QND) measurements of individual microwave photons is a powerful resource for quantum computation\, communication and simulati on. I will illustrate these capabilities with recent experiments on a pro grammable quantum simulator that uses efficient boson sampling of microwave photons to predict the Franck-Condon vibrational spectra of various small tri-atomic molecules. Finally\, I will briefly explore possible future dir ections for simulation of quantum many-body problems involving interacting bosons.

The talk will be based on this journal article: ‘Efficient M ultiphoton Sampling of Molecular Vibronic Spectra on a Superconducting Boso nic Processor\,’ Christopher S. Wang et al.\, Phys. Rev. X10\, 021060 (2020 ).

We are hosting the Fall 2020 JQI Seminars virtually as Zoom meeti ngs. JQI members and affiliates will receive a Zoom link in an email announ cing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews&nb sp\;(link \;is external) LAST-MODIFIED:20200929T021618Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201006T150000Z DTEND:20201006T160000Z DTSTAMP:20260828T094430Z UID:5kn9ij05rbnenhpvdo6ltfjtkn@google.com CREATED:20200915T181846Z DESCRIPTION:
Speaker: Steve Kivelson \;(Stanford University)< br>


Title: The quantum superconductor to metal transition

Abstract: Theoretical considerations concerning the nature of the quantum superconductor to metal transition – especially where the superconducting order is inhomogeneous – are discussed. \; Co nditions under which mean-field theory gives a good description of the tran sition are distinguished from those in which fluctuation superconductivity is expected to be important in a significant range of parameters.

Time: Oct 6\, 2020 11:00 AM Eastern Time (US and Canada)

Ema il rcawthor@umd.edu for Zoom details< /b>
LAST-MODIFIED:20201001T181754Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201207T163000Z DTEND:20201207T170000Z DTSTAMP:20260828T094430Z UID:3frq9oambgsk5vv5on6mhe3id7@google.com CREATED:20201117T010436Z DESCRIPTION:Title: Quantum Simulation of Hyperbolic Space with Circuit Qua ntum Electrodynamics\n\nSpeaker: Igor Boettcher\, JQI Postdocs\n\nAbstract: Looking for some fresh bathroom tiles? Why don't you try regular 7-gons th is time\, it looks amazing! Only requirement: You'd need to live in hyperbo lic space of constant negative curvature. To see how this would be like\, l et me take you onto a journey into hyperbolic space through recent breakthr ough experiments in circuit quantum electrodynamics\, where such tilings ar e realized with superconducting resonators and photons are tricked into bel ieving that space is hyperbolic. I will show how these finite lattice geome tries can be mapped onto quantum field theories in continuous negatively cu rved space and how this can be used to compute observables relevant for exp eriments. LAST-MODIFIED:20201117T010507Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190320T150000Z DTEND:20190320T160000Z DTSTAMP:20260828T094430Z UID:3ta1c43d48802oh5qdpjs6j7fe@google.com CREATED:20190124T135501Z LAST-MODIFIED:20190205T162100Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar-NO SEMINAR-SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180918T160000 DTEND;TZID=America/New_York:20180918T170000 RRULE:FREQ=WEEKLY;UNTIL=20190625T035959Z;BYDAY=TU EXDATE;TZID=America/New_York:20181218T160000 EXDATE;TZID=America/New_York:20181225T160000 EXDATE;TZID=America/New_York:20190101T160000 EXDATE;TZID=America/New_York:20190108T160000 EXDATE;TZID=America/New_York:20190115T160000 EXDATE;TZID=America/New_York:20190122T160000 EXDATE;TZID=America/New_York:20190604T160000 EXDATE;TZID=America/New_York:20190611T160000 EXDATE;TZID=America/New_York:20190618T160000 EXDATE;TZID=America/New_York:20180925T160000 EXDATE;TZID=America/New_York:20181002T160000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com CREATED:20180727T143919Z LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200427T200000Z DTEND:20200427T213000Z DTSTAMP:20260828T094430Z UID:5979fqia8jekpcr3co6dbu5b1i@google.com CREATED:20200107T141522Z DESCRIPTION:To be conducted through zoom.\n\nSpeaker: Jonathan Kozaczuk\, U CSD\n\nTitle and abstract: tk LAST-MODIFIED:20200403T173636Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190912T180000Z DTEND:20190912T193000Z DTSTAMP:20260828T094430Z UID:37738r2nlq2gn0m5d42uquktc5@google.com CREATED:20190718T132855Z DESCRIPTION:Title: “Atomic scale design\, structure and stability of quantu m nanowires located on epitaxial interfaces and free-standing in space.”\nS peaker: Michail Michailov\, Institute of Physical Chemistry\, Bulgarian Ac ademy of Science\n\nAbstract: \nMetal nanowires excite remarkable academic curiosity as physical systems with confined geometry\, reduced dimensionali ty\, and peculiar quantum properties. The exotic features of the nanowires are strongly dependent on their size\, shape and morphology\, and therefore detailed knowledge of the nanowire fine atomic structure is indispensable. The present paper gives an overview on the problem of structural instabili ty\, spontaneous breakdown\, and complete disintegration of metal nanowires located on epitaxial interfaces or free‐standing in space. The introduced new physical model reveals specific multi‐step vacancy‐mediated mechanism o f thermaly activated nanowire rupture. Accounting for the impact of essenti al physical quantities on the nanowire instability including system tempera ture\, number of defects\, lattice mismatch\, interface anisotropy\, atomic interactions\, ridgidity and flexibility\, this model identify a general s cenario of nanowire decomposition. The complete rupture kinetics of monatom ic nanowire breakdown is described by a set of rate equations and on that b ackground expressions are derived for physically important and experimental ly accessible quantities including time‐dependent probability for nanowire breakdown and nanowire mean lifetime. The presented ensemble of studies con tributes to a new type atomic‐scale design of epitaxial interfaces\, giving insight into thermal instability\, rupture mechanism and fine tuning of th e structural\, morphological and thermodynamic properties of a large variet y of metal nanowires.\n\n\nHost: Ted Einstein\nRefreshments 1:30pm John S T oll Physics Bldg Room 1117 LAST-MODIFIED:20190718T132855Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Michail Michailov\, Institute of Physical Chemistr y\, Bulgarian Academy of Science TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190227T200000Z DTEND:20190227T213000Z DTSTAMP:20260828T094430Z UID:3b7uoldhlb4oin8aqj0f466h37@google.com CREATED:20190129T145615Z DESCRIPTION:Kyle Parfrey\, NASA Goddard Space Flight Center\n\nTitle: Black -Hole Energy Extraction via General-Relativistic Kinetic Plasma Simulations \n\nAbstract:Black holes of all masses drive powerful relativistic jets\, u sing magnetic fields dragged in by their accretion flows. The jets' plasma should be so diffuse as to be effectively collisionless\, and self-consiste ntly supplied by pair creation near the horizon. I will present general-rel ativistic kinetic plasma simulations of the collisionless magnetospheres of rotating black holes\, showing the launching of electromagnetic jets by th e Blandford-Znajek mechanism. The simulations reveal a population of partic les with negative energy at infinity\, which can contribute significantly t o black-hole rotational-energy extraction in a variant of the Penrose proce ss. The kinetic approach may be useful for studying the accretion flows of the Event Horizon Telescope targets\, Sgr A* and M87\, where the plasma is likewise of low density and collisionless. LAST-MODIFIED:20190219T195944Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181029T110000 DTEND;TZID=America/New_York:20181029T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181029T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Robust Fabrication and Measurement of Atomically Precise \, Solid State Devices \n\nSpeaker: Richard Silver\, NIST\n\nAbstract: NIST has a substantial program to develop atomically precise\, atom-based elect ronic devices for use in quantum information processing\, quantum materials research\, and quantum sensing. We are using hydrogen-based scanning pro be lithography to enable deterministic placement of individual dopant atoms with atomically aligned gates to build single electron transistors and sin gle or few atom devices which display quantum behavior. We have developed robust lithography\, device relocation\, and contact processes that enable the routine electrical measurement and operation of atomically precise devi ces\, with an emphasis on minimizing process-induced dopant movement. \n\n In addition to our fabrication technology\, we will discuss low temperature transport measurements of STM patterned test structures and nanometer scal e wire devices to investigate low dimensional transport and materials prope rties. We will present the characterization of atomic-scale tunnel junction s and single electron transistors that demonstrate stable coulomb blockade oscillations. We achieve controlled variation in electronic and quantum pr operties as a function of atomic scale changes in device geometry. Our low temperature measurements demonstrate superb charge stability with minimal switching events. Our most recent single atom transistor results show elec tron addition energies of ~47 meV\, consistent with single Phosphorus donor atom D0 to D- transitions. LAST-MODIFIED:20181026T115744Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190422T190000Z DTEND:20190422T203000Z DTSTAMP:20260828T094430Z UID:3of02cqr4dtjge9ffup90fvc1a@google.com CREATED:20190129T144421Z DESCRIPTION:

Andrew Long\, U Michigan &\; Rice U.
Title Making and Measuring Ultra-Light Matter

Abstract: Abstract: In this talk I will discuss a new model for producing ultra-light\, dark photon dark matter and a new ob servational strategy for probing ultra-light\, axion-like particles. In reg ard to dark photons\, it is notoriously difficult to explain how this dark matter candidate was produced in the early universe\, and I will discuss ho w dark photons can arise from a network of cosmic strings. In regard to axi ons\, it is well-known that the anomalous cooling of compact stars can prov ide an indirect probe of these weakly-coupled particles\, and I will discus s how X-ray observations of magnetic white dwarf stars provide a new test o f these theories. \; \; LAST-MODIFIED:20190416T130926Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191008T160000 DTEND;TZID=America/New_York:20191008T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191008T160000 CREATED:20190530T191015Z DESCRIPTION:\nTitle: Postcards from the Future — The Physics Landscape at the High-Luminosity LHC \n\nSpeaker: Meenakshi Narain\, Brown University \n\n\nAbstract:\nThe discovery of the Higgs Boson by the ATLAS and CMS expe riments at the Large Hadron Collider (LHC) in Geneva\, Switzerland\, was on e of the most important and exciting moments in particle physics. The field of particle physics has transitioned to a new phase that presents us with a new opportunity to gain a deeper understanding of the fundamental nature of matter and our universe. I will discuss some of these implications\, wh ich inform the efforts to figure out the roadmap of particle physics in th e coming decades. Starting around 2026\, the High-Luminosity LHC (HL-LHC) w ill deliver proton-proton collisions at a center-of-mass energy of \\sqrt{s } = 14 TeV. I will summarize the studies from a comprehensive campaign moun ted in 2018\, to understand the physics reach of the experiments at the HL- LHC and a possible higher energy LHC (HE-LHC) at 27 TeV. LAST-MODIFIED:20190918T150520Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191107T210000Z DTEND:20191107T223000Z DTSTAMP:20260828T094430Z UID:3liuoavkgluv8531v8moll4f2k@google.com CREATED:20191011T201716Z DESCRIPTION:Ian Low\, Northwestern University and Argonne National lab\n\nT itle: A Modern Perspective on Nambu-Goldstone Bosons\n\nAbstract: The Nambu -Goldstone boson (NGB) is a massless degree of freedom associated with spon taneous symmetry breaking\, whose interactions depend on the pattern of sym metry breaking in the UV\, according to conventional wisdom. In this talk I will describe a new approach to understanding NGBs using only the IR data\ , which result in a new way to construct consistent effective field theorie s of Nambu-Goldstone bosons. I will also comment on implications of the IR approach to electroweak symmetry breaking. LAST-MODIFIED:20191022T134538Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201019T203000Z DTEND:20201019T213000Z DTSTAMP:20260828T094430Z UID:32ocsoakoec7bv2i6j33s2018r@google.com CREATED:20200917T165955Z DESCRIPTION:Title: Recent advances in astrophysics of cosmic rays and gamma -ray astronomy

Speaker: Igor Moskalenko\, Stanford University

Abstract: Astroparticle physics or particle astrophysics combines efforts and interests of two communities\, particle physicists and astrophysicists\ , and presents the broadest field of research that covers experiments invol ving man-made machines as well as experiments that are running for billions of years by Nature itself. These involve all types of known and yet unknow n particles and emissions in the broadest energy range possible\, far excee ding the capabilities of the terrestrial and extraterrestrial laboratories. Last decade was rich on discoveries and breakthrough results in many areas of traditional astroparticle physics and even more is expected in the near future. Astrophysics of cosmic rays and gamma-ray astronomy are the two ar eas that are developing very fast\, thanks to the state-of-the-art instrume ntation put into space. New data provided by these instruments pose a consi derable challenge to conventional astrophysics thus leaving an ample discov ery space for new phenomena. I will review recent advances in astrophysics of cosmic rays and gamma-ray astronomy and discuss their possible interpret ation.

Talk slides: \;https://go.umd.edu/1910201630

Registe r at https:// bit.ly/2PmJoT6 LAST-MODIFIED:20201019T231059Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200310T180000Z DTEND:20200310T193000Z DTSTAMP:20260828T094430Z UID:0imejgrqopa47jr6su33mqsdbb@google.com CREATED:20200305T020440Z DESCRIPTION:Speaker:  \;Ronny Thomale (Universitat Wurzburg)

Tit le:  \;The Quest of the Kagome Hubbard Model

Abstract:  \;Si nce its (re-)discovery in the second half of the 20th century\, the lattice of corner-sharing triangles called kagome has become one of the key domain s featuring paradigmatic models for exotic quantum electronic states of mat ter. Depending on the filling\, the Hubbard model on the kagome lattice exh ibits several fascinating phases subject to contemporary research in conden sed matter physics\, ranging from topological spin liquids over correlated Dirac metals and unconventional superconductivity to spin-type and charge-t ype Peierls phases as well as turbulent hydrodynamic flow. I will discuss r ecent progress in theory to understand such scenarios of correlated electro n systems on the kagome lattice.

Host:  \;Jay Sau

CMTC s eminars:  \;http://physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20200305T023306Z LOCATION:ATL 4402\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190205T190000Z DTEND:20190205T201500Z DTSTAMP:20260828T094430Z UID:0lv87844219q1laj9if2lipfom@google.com CREATED:20190130T000736Z DESCRIPTION:Title: Quantum Many-Body Physics Beyond Ground States

Speaker: Tom Iadecola (CMTC/JQI\, Univ. of Maryland)

Abstract: Recently a set of traditional assumptions in quantum condensed matter theor y has been upended by the realization that many-body systems can host stabl e quantum phenomena at infinite temperature. I will discuss recent work su ggesting that there is a much richer landscape of such phenomena than has s o far been appreciated. First\, I will show how strongly disordered quantu m many-body systems can spontaneously segregate into delocalized and locali zed degrees of freedom\, leading to a so-called "mobility emulsion." Second \, I will discuss how symmetries in otherwise generic systems can protect q uantum coherence at infinite temperature through the existence of index the orems more commonly associated with topological phases. Finally\, I will d iscuss "quantum many-body scars\," a novel manifestation of high-temperatur e quantum coherence observed in recent experiments that so far lacks a phys ical explanation. I will suggest a new picture of this phenomenon wherein t he observed coherent dynamics emerges from correlations among low-lying exc itations.

Condensed Matter Theory Center website:
http ://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190130T010202Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201019T200000Z DTEND:20201019T213000Z DTSTAMP:20260828T094430Z UID:3l82nltl8llvl7oltnsoq57lte@google.com CREATED:20200909T180048Z DESCRIPTION:Speaker: \; Yizhou Huang\, UMD


Title: \;Desi gn and Fabrication of Planar Transmon Qubits \; \;

Abstract:  \;
In this talk\, I will discuss the design\, fabrication\, and pre liminary data of a superconducting transmon qubit. My qubit\, in an effort to improve its coherence time\, incorporates a thin film of aluminum grown by molecular-beam epitaxy on a silicon substrate. After patterning and etch ing the initial MBE aluminum layer via photolithography\, a Josephson junct ion is added by electron-beam lithography\, ion milling of the initial laye r\, and double angle evaporation of aluminum with an oxidation step. I will discuss current challenges that I have encountered during fabrication as w ell as some preliminary data at 20 mK of three independent qubits each coup led to their own resonator. \; \;

Advisor: Palmer


Zoom Link \; &\;  \; \;Log In Information


https://umd.zoom.us/s/91198037643

Meeting ID: 911 9803 7643 \;

Password:558484 \;

LAST-MODIFIED:20201014T201502Z LOCATION:zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Yizhou Huang\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181112T213000Z DTEND:20181112T223000Z DTSTAMP:20260828T094430Z UID:4emvam81otegnstkjqff9d9lrn@google.com CREATED:20181010T235035Z DESCRIPTION:Title: What is the physical origin of the Fermi bubbles?

Speaker: Hsiang-Yi Karen Yang\, Department of Astronomy\, University of Ma ryland

Abstract: The Fermi bubbles\, two giant bubbles above and below the Galactic center (GC)\, are among the most fascinating phenomena revealed b y the Fermi Gamma-ray Space Telescope. The symmetry about the GC suggest th at they likely originate from energetic events at the GC such as nuclear st arburst or supermassive black hole activity. Because of its proximity\, the spatially-resolved\, multi-messenger observational data have provided impo rtant clues about the formation mechanisms of the bubbles. In this talk\, I will give an overview on the current status of our understanding about the Fermi bubbles\, both in terms of observations and theoretical investigatio ns. I will identify the most promising models proposed to date and highligh t future prospects in distinguishing the different scenarios of bubble form ation.

Notes: Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20181010T235210Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190910T160000 DTEND;TZID=America/New_York:20190910T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20190910T160000 CREATED:20190530T191015Z DESCRIPTION:
Hawking radiation in a laboratory!?

Distin guished University Professor Lecture by Ted Jacobson

Eins tein's theory of gravity opened Pandora's box of warped spacetime in 1915\, and out popped the black hole\, confusing and delighting (or maddening) ph ysicists ever since. In the early 1970's it was discovered that black holes have entropy and temperature\, and decay by Hawking radiation like radioac tive whirlpools in the spacetime river. Two persistent puzzles have resulte d from this discovery: the information paradox and the transPlanckian probl em. To bring some of this down to earth\, Unruh in 1980 conceived of a blac k hole analog\, formed by a quantum fluid\, which might one day be studied in a laboratory. That day has now come...probably. In the last few years\, Jeff Steinhauer has carried out a number of experiments on Bose-Einstein co ndensates of rubidium atoms\, configured to emulate a black hole\, and repo rted on the observation of thermal phononic Hawking radiation and its quant um entanglement with phonons inside the sonic black hole. In this colloquiu m I will describe these ideas and experiments\, as well as simulations that have been carried out in order to help understand what has so far been obs erved. LAST-MODIFIED:20190812T141018Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190905T193000Z DTEND:20190905T203000Z DTSTAMP:20260828T094430Z UID:26f3fsncu4lf6qpel5iufmtaej@google.com CREATED:20190830T144445Z DESCRIPTION:Organizers: Richard Wentworth (Math\, on leave fall 2019)\, Tri stan Hubsch (Physics\, Howard Univ.)\, Jonathan Rosenberg (Math)\, Amin Gho lampour (Math)
Other Faculty Participants: Joel Cohen (Math)\, Paul Gree n (Math\, emeritus)

When: Thursdays @ 3:30pm-4:30pm

Where: MT H (Kirwan Hall) 1313

Topic: symmetry-protected topological phases a nd connections to topological
QFTs.

The web site ishttps://www-math.umd.edu/research/seminars/rit-on-geometry-and-phsyics.html LAST-MODIFIED:20190830T150427Z LOCATION:MTH Kirwan Hall 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200915T160000Z DTEND:20200915T170000Z DTSTAMP:20260828T094430Z UID:0hrevu0ebctrahdsev5boern2p@google.com CREATED:20200911T201003Z DESCRIPTION:Title : Band Engineering for Quantum Simulation in Circuit Q ED
Speaker Name: Alicia Kollár
Speaker Institution : UMDNotes: For Zoom link you may contact Kelly Foster (foster5@illinois.edu)\, or Becky McDuff ee (mcduffbe@illinoi s.edu).
Abstract : The field of circuit QED has emerged as a rich p latform for both quantum com- putation and quantum simulation. Lattices of coplanar waveguide (CPW) resonators realize artificial photonic materials i n the tight-binding limit. Combined with strong qubit-photon interactions\, these systems can be used to study dynamical phase tran- sitions\, many-bo dy phenomena\, and spin models in driven-dissipative systems. I will show t hat these waveguide cavities are uniquely deformable and can produce lattic es and networks which cannot readily be obtained in other systems\, includi ng periodic lattices in a hyperbolic space of constant negative curvature. Furthermore\, I will show that the one-dimensional nature of CPW resonators leads to degenerate flat bands and that criteria for when they are gapped can be derived from graph-theoretic techniques. The resulting gapped flat-b and lattices are difficult to realize in standard atomic crys- tallography\ , but readily realizable in superconducting circuits. LAST-MODIFIED:20200911T201003Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181012T230000Z DTEND:20181013T003000Z DTSTAMP:20260828T094430Z UID:1en2feutgjegnu76duo2ou7div@google.com CREATED:20180917T141053Z LAST-MODIFIED:20180925T181315Z LOCATION:Phys 1412 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics is Phun: Induction TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200318T150000Z DTEND:20200318T160000Z DTSTAMP:20260828T094430Z UID:1gt493p32ipqmjk413v9lbn7cj@google.com CREATED:20200122T143218Z LAST-MODIFIED:20200122T143218Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR - SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201015T200000Z DTEND:20201015T210000Z DTSTAMP:20260828T094430Z UID:695cc7ct2hjfr53fncnn046npc@google.com CREATED:20200910T195432Z DESCRIPTION:Seth Koren\, UC Santa Barbara

Seminar to be conducted vi a zoom.

Title: UV/IR Mixing and the Hierarchy Problem

Abstrac t:The persistence of the hierarchy problem points to a violation of effecti ve field theory expectations. A compelling possibility is that this results from a physical violation of EFT\, which may arise from correlations betwe en UV and IR physics---as is broadly demanded by gravity. I will discuss No ncommutative Field Theory as a toy model of UV/IR mixing\, where an emergen t infrared scale is generated from ultraviolet dynamics. I’ll explore a var iety of such theories to develop a picture of how this feature appears\, an d to glean lessons to guide the realization of UV/IR mixing in more realist ic theories.

For zoom link please email mknouse@umd.edu LAST-MODIFIED:20201009T201747Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190930T190000Z DTEND:20190930T203000Z DTSTAMP:20260828T094430Z UID:28ofcf66c5pk4epr467vbtqqb1@google.com CREATED:20190820T185042Z DESCRIPTION:Speaker: Sylvain Fichet\, ICTP/SAIFR and Caltech\n\nTitle: The warped dark sector\n\nAbstract: I present a dark sector scenario based on a 5d AdS space. Such a construction\, also motivated as the AdS dual of a co mposite dark sector\, naturally leads to models in which parts of the dark sector vanish at high 4d momentum or temperature. This sense of AdS "opacit y" arises as a result of the dressing of propagators by bulk interactions. Exotic signatures are possible from laboratory to cosmological scales\, inc luding long-range forces with non-integer behaviour\, non-standard momentum losses\, periodic signals at colliders\, “soft bombs” events\, as well as a dark phase transition and a typically small amount of dark radiation. LAST-MODIFIED:20190920T132814Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200305T180000Z DTEND:20200305T190000Z DTSTAMP:20260828T094430Z UID:2oqqaab3sg6hvmjaj6dsb96f4g@google.com CREATED:20200227T134942Z DESCRIPTION:

Turbulent amplification of cosmic magnetic f ields

Siyao Xu (University of Wisconsin)

< p>As foreseen by Chandrasekhar\, advances in the physics of turbulenc e play an important part in the development of astrophysics. Thanks to the modern numerical techniques and observations\, significant progress has bee n made in understanding the statistics and dynamics of turbulence in the as trophysical context. Among the fruitful applications of turbulence to a wid e diversity of astrophysical phenomena\, I will focus on the turbulent ampl ification of cosmic magnetic fields\, i.e.\, the turbulent dynamo. Magnetic fields fill the universe. They play a fundamental role in many astrophysic al processes over a vast range of length scales through the evolution of th e universe. Turbulence\, which is ubiquitous in the universe\, is found to be responsible for the amplification and maintenance of cosmic magnetic fie lds\, with the turbulent kinetic energy converted to magnetic energy. I wil l talk about my work on developing a new dynamo theory that can be generall y applied to a variety of plasma conditions\, its supercomputer numerical t ests in a weakly ionized medium\, and its applications to interpreting puzz ling astrophysical observations.


LAST-MODIFIED:20200227T135729Z LOCATION:3150 PSC\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190423T171500Z DTEND:20190423T181500Z DTSTAMP:20260828T094430Z UID:5970be0cog6apk8o3n456ktlga@google.com CREATED:20190205T175419Z DESCRIPTION:Speaker: Professor Uwe Täuber\, Virginia Tech\n\nTitle: Tempera ture Interfaces in the Katz-Lebowitz-Spohn Driven Lattice Gas\n\nAbstract: We explore the intriguing spatial patterns that emerge in a two-temperature Katz-Lebowitz-Spohn (KLS) model in two dimensions\, a driven lattice gas w ith attractive nearest-neighbor interactions and periodic boundary conditio ns. The domain is split into two regions with hopping rates governed by dif ferent temperatures T > Tc and Tc\, respectively\, where Tc indicates the c ritical temperature for phase ordering\, and with the temperature boundarie s oriented either transverse or parallel to the drive. For a transverse tem perature interface\, the system behaves like the (totally) asymmetric exclu sion process (T)ASEP in the hotter region\, and experiences particle blocka ge in front of the boundary to the critical region. In analogy with TASEP s ystems containing "slow" bonds\, transport in the high-temperature subsyste m is impeded by the lower current in the cooler region\, which tends to set the global stationary particle current value. We observe the density profi les in both high-and low-temperature subsystems to be strikingly similar to the well-characterized coexistence and maximal-current phases in (T)ASEP m odels with open boundary conditions\, namely governed by hyperbolic / trigo nometric tangent functions. If the lower temperature is set at Tc\, we inst ead detect the corresponding critical power law density decay. For a parall el interface\, we observe the critical region to act as an absorbing sink f or particle transport. If one part of the system is held at temperature T < Tc\, that region forms a large particle or hole strip\, and randomly switch es between either configuration. LAST-MODIFIED:20190205T175419Z LOCATION:IPST 1116 Conference Room (Bldg. #085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190206T190000Z DTEND:20190206T203000Z DTSTAMP:20260828T094430Z UID:13ef0bgtuq3bc5etcrike2j8a6@google.com CREATED:20190205T145556Z DESCRIPTION:Ali Hamed Moosavian\n\nTitle: Simulating fermionic QFT on a qua ntum computer"\n\nAbstract:\n\nIn quantum algorithms discovered so far for simulating scattering\nprocesses in quantum field theories\, state preparat ion is the slowest\nstep. We present an algorithm for preparing particle st ates to use\nin simulation of fermionic quantum field theory (QFT) on a qua ntum\ncomputer\, which is based on the matrix product state ansatz. We appl y\nthis to the massive Gross-Neveu model in one spatial dimension to\nillus trate the algorithm\, but we believe the same algorithm with slight\nmodifi cations can be used to simulate any one-dimensional massive\nfermionic QFT. In the case where the number of particle species is\n$1$\, our algorithm c an prepare particle states using $O(\\epsilon^{\\text{\\textminus}3.23...}) $\ngates\, which is much faster than previous known results\, namely\, $O(\ \epsilon^{\\text{\\textminus}8\\text{\\textminus}o(1)})$.\nFurthermore\, un like previous methods which were based on adiabatic\nstate preparation\, th e method given here should be able to simulate\nquantum phases unconnected to the free theory. LAST-MODIFIED:20190206T141459Z LOCATION:PSCI 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190927T170000Z DTEND:20190927T180000Z DTSTAMP:20260828T094430Z UID:77rnusi6p8cr5ckj0v1serc5b5@google.com CREATED:20190905T132505Z LAST-MODIFIED:20190905T132505Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMINAR - BIG TEN FOOTBALL GAME TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181126T200000Z DTEND:20181126T213000Z DTSTAMP:20260828T094430Z UID:1m58koafvjtgju7a1pc94a6k41@google.com CREATED:20181106T162440Z DESCRIPTION:
Title: The strong CP problem: LHC and flavor physics

Speaker: Diego Redigolo\, Princeton University

Abstract: I will dis cuss different frameworks addressing the strong CP problem in the Standard Model. First\, I will discuss heavy axion solutions which are testable at c olliders and a new search program I have been working on to hunt for them a t the LHC and at flavor experiments. Second\, I will explain how the strong CP problem can be solved at high scale and possibly connected to the flavo r structure of the Standard Model. \;
LAST-MODIFIED:20181120T202339Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190905T123000 DTEND;TZID=America/New_York:20190905T133000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20191207T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20190926T123000 EXDATE;TZID=America/New_York:20191024T123000 EXDATE;TZID=America/New_York:20191128T123000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com CREATED:20190828T134015Z DESCRIPTION:Title: TBA\nSpeaker: TBA\n[Institution TBA] | [Unit TBA]\n\nAbs tract: TBA LAST-MODIFIED:20190828T153313Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181206T190000Z DTEND:20181206T203000Z DTSTAMP:20260828T094430Z UID:51vb9k38dsucfrfr9rnd2l8a1h@google.com CREATED:20180904T151326Z DESCRIPTION:Title: Visualization of topological states of matter using m icrowave impedance microscopy

Speaker: Monica Allen\, UC San Diego \;

Abstract: \;
A main thrust of condensed matter physics concerns the discovery of new electronic states in emerging materials. One example is the rapidly expanding class o f topological materials\, which are posited to enable realization of non-ab elian particles and topological quantum computing. In this talk\, I will di scuss how exotic phenomena can arise from the interplay of ferromagnetism a nd topology. We employ microwave impedance microscopy (MIM)\, which charact erizes the local complex conductivity of a material\, to directly image chi ral edge modes and phase transitions in a magnetic topological insulator. F inally\, I will outline how MIM could be used in the future to visualize an d manipulate Majorana modes\, an emerging platform for quantum information processing.

Host: J. Williams

Refreshments Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181114T141334Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Monica Allen\, UC San Diego TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200313T160000Z DTEND:20200313T164000Z DTSTAMP:20260828T094430Z UID:0m9948j19g11oc17bhi878q6mm@google.com CREATED:20200310T001035Z DESCRIPTION:
CANCELLEDTitle: Interaction quench in an ultracold bosonic gas: prethermalization to thermalization crossover \; \;
Speaker : \;Mathias Van Regemortel

(pizza and drinks served at 12pm\; talk st arts at 12:10pm) \;

Abstract: Ever since the development of quantum mechanics in the early days\, it has been a central question how the unitar y time evolution of a quantum wave function of many particles may generate a seemingly thermal ensemble in the long-time limit—at least in the eyes of an experimenter with limited tools to probe the system. The idea of a quan tum quench is closely related to this question\; by applying an abrupt chan ge to a many-body Hamiltonian\, a certain amount of energy is injected into the system\, which subsequently forces the system to evolve in a non-trivi al way. In the last years\, cold-atom experiments have become an extremely important playground to test the theoretical predictions for quantum quench es. I will give a short overview of a few recent experiments and explain wh at makes this setup so interesting for the field.
I will then continue w ith the specific example of a weak interaction quench in the ultracold boso nic gas\, which can be realized with a Feshbach resonance. If the Hamiltoni an is approximated as quadratic\, the interacting gas is integrable and wil l equilibrate to a ‘prethermal’ state via a dephasing mechanism\, which is not yet a thermal equilibrium. From there on\, ergodic interactions between quasiparticles take over\, in particular Beliaev-Landau scatterings\, whic h lead the system to full thermalization on a much slower time scale. This two-stage relaxation process\, with a vast difference in time scales\, can be witnessed in the evolution of simple few-body observables\, such as the density correlations in the fluid\, a quantity that can be measured in expe riment.


Mathias Van Regemortel\, Hadrien Kurkjian\, Michiel Wout ers and Iacopo Carusotto\, Phys. Rev. A 98\, 053612 (2018) LAST-MODIFIED:20200311T133435Z LOCATION:ATL 2324\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cancelled: JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190905T180000Z DTEND:20190905T193000Z DTSTAMP:20260828T094430Z UID:43pke1j9grgs8eofjdrgb3350g@google.com CREATED:20190806T142628Z DESCRIPTION:Title: “Exploring Propagating Quantum Microwave Fields: Parity Detection\, Wigner Tomography and Heralded Cat States”\nSpeaker: Andreas Wa llraff\, ETH Zurich\, Switzerland\n\nAbstract: \nSingle-photon detection\, challenging to realize in the microwave domain\, is an essential component in many quantum optics experiments. In this talk I describe a quantum non-d emolition (QND)\, single-shot parity detector for propagating microwave fie lds and characterize its performance using a true single-photon source. The parity detection is based on performing a cavity-assisted conditional phas e gate between an incident photon and a superconducting three-level system. By reading out the state of the qutrit with single-shot resolution\, we re ach an external (internal) detection fidelity of 50% (71%) for individual p hotons [1]. We illustrate the single-shot and QND character of our parity d etector for multi-photon propagating microwave fields by heralding propagat ing cat states with average fidelity of 90 % from an incident coherent radi ation field [2]. In the same setup\, we combine parity measurements with re al-time displacement operations to perform complete Wigner tomography of pr opagating fields. We also demonstrate a mode reduction technique which enab les joint parity measurements of photons encoded in multiple time bins. We expect multi-photon QND measurements of itinerant fields to develop into an important tool for the creation of future quantum communication networks i n the microwave domain.\n\n[1] J.-C. Besse et al.\, Phys. Rev. X 8\, 021003 (2018)\n[2] J.-C. Besse et al.\, Quantum Devvice Lab (2019)\n\nThis resear ch was performed in a collaboration between Jean-Claude Besse\, Simone Gasp arinetti\, Michele C. Collodo\, Theo Walter\, Philipp Kurpiers\, Marek Pech al\, Ants Remm\, Jonas Krause\, Christopher Eichler\, and Andreas Wallraff \n\n\nHost: Vladimir Manucharyan\nRefreshments 1:30pm John S Toll Physics B ldg Room 1117 LAST-MODIFIED:20190822T200327Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Andreas Wallraff\, ETH Zurich\, Switzerland TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201204T170000Z DTEND:20201204T180000Z DTSTAMP:20260828T094430Z UID:0nr6oggehltgisp5amgk3mkhih@google.com CREATED:20201201T140227Z DESCRIPTION:\nTitle : Experimental realization of a 1D prethermal discrete time crystal\nSpeaker : Antonios Kyprianidis (JQI)\nTime : 12 - 12:45pm\, Friday\, Dec. 4\n\nSeminar will be held via Zoom: https://umd.zoom.us/j/970 99328991 and Meeting ID : 970 9932 8991\n\nApplying a periodic Hamiltonian to a system of particles allows us to study out-of-equilibrium matter\, lik e the prethermal discrete time crystal (PDTC). One can define a time-indepe ndent Hamiltonian that describes the dynamics of the driven system not cont inuously\, but in a stroboscopic manner. This implies energy conservation d uring the validity window of this approximation. In this work\, we realized a PDTC by applying such a periodic drive to a collection of 25 trapped ion s\, and characterized the prethermal time window where faster driving slows down the thermalization process towards higher entropy. The effective pret hermal Hamiltonian description during that time is a long-range Ising model of spin-spin interactions\, featuring a temperature-induced phase transiti on. Taking advantage of the ion trap system’s tunability\, we were able to prepare both regimes above and below the critical temperature LAST-MODIFIED:20201201T140236Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200918T170000Z DTEND:20200918T180000Z DTSTAMP:20260828T094430Z UID:1ndqdpv1ikvaulr9i400tp1vlr@google.com CREATED:20200910T165400Z DESCRIPTION:Speaker: Charles Clark\, NIST Fellow and Fellow of the Joint Qu antum Institute National Institute of Standards and Technology and UMD -&nb sp\;https://jqi.umd.edu/people/charles-clark

Title: Neutro n Interference\, Imaging and Detection

Abstract: The neutron is pres ent in all but one of the 3000 known atomic nuclei\, and it is the only nuc lear particle with no electric charge. These features make possible the neu tron chain reactions that are the source of nuclear power\, and the analysi s of materials that are opaque to light or x-rays. Neutrons can boldly go w here no particle has gone before\, to discover water on planetary bodies. T he Washington\, DC metropolitan area is a world center of neutron-based mat erials research\, with numerous opportunities available at the University o f Maryland and the National Institute of Standards and Technology.

< b>ZOOM: Contact Sherri Tatum\, statum12@umd.edu LAST-MODIFIED:20200910T165400Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201123T210000Z DTEND:20201123T223000Z DTSTAMP:20260828T094430Z UID:0o395l77o9fd4m71838jrm00qq@google.com CREATED:20200909T182428Z DESCRIPTION:Speaker: Kungang Li\, UMD


Title: \;T1  \;of transmons with electrodes that have different gaps.
Abstract:< br>Using double-angle evaporation we fabricated a transmon which had one el ectrode formed by deposition of nominally pure aluminum and the counter-ele ctrode formed by deposition of oxygen-doped aluminum. On the same sapphire chip\, during the same pump-down of the evaporator we deposited a second tr ansmon with both electrodes made from nominally pure aluminum. The energy g aps of the electrodes depend on the film thickness and the grain size\, whi ch is affected by the oxygen doping. Measurements of the relaxation time T< sub>1 \;of the first device at 10 mK revealed a typical lifetime of about 200 microseconds while the second device had a typical T1 \;of about 90 microseconds. When T1 \;was measured as a function of temperature up to 300 mK\, the two devices showed significan tly \;different onset temperatures \;for the appearance of thermal& nbsp\;quasiparticles. \; We compared our T1 \;vs T resul ts to a model based on the behavior of \;nonequilibrium quasiparticles residing in the electrodes and extracted the energy gap and the density of the non-equilibrium quasiparticles. \;Advisors: \;Wellstood &\; Lobb


Zoom Link \; &\; \; \;Log In Information


https://umd.zoom.us/s/91198037643

Meeting ID: 911 9803 7643 \;

Password:558484 \;

LAST-MODIFIED:20201109T135229Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Kungang Li\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191210T190000Z DTEND:20191210T203000Z DTSTAMP:20260828T094430Z UID:7dcf3k1amra1cq4qrf87o5p79h@google.com CREATED:20191209T200048Z DESCRIPTION:Speaker: Ahmed Almheiri\, IAS\n\nTitle: Replica wormholes and t he entropy of Hawking radiation\n\nAbstract: I will review recent work on a pplying ideas of holography to the problem of evaporating black holes. I wi ll consider a model of a black hole coupled to holographic matter that can be thought of as living on a Randall-Sundrum brane on the boundary of a hig her dimensional AdS space. I will show how the standard RT formula in the h igher dimensions reproduces the Page curve indicative of unitary black hole evaporation. These results suggest a new prescription for computing the en tanglement entropy of the Hawking radiation whereby new contributions from the interior of the black hole\, or what we call ''islands''\, become relev ant. I will show how the island conjecture can be derived more generally fr om replica wormholes which are saddles of the Euclidean gravitational path integral connecting the different replica sheets. LAST-MODIFIED:20191209T200604Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200413T160000 DTEND;TZID=America/New_York:20200413T173000 DTSTAMP:20260828T094430Z UID:1or5rnerh7k9m5patv9kje2bo7@google.com RECURRENCE-ID;TZID=America/New_York:20200413T160000 CREATED:20200410T133902Z DESCRIPTION:Will be conducted through zoom.\n\nSpeaker: Kfir Blum\, Weizman n Institute of Science\n\nTitle:\nThermonuclear supernovae — is there a sup ernova bound on axions?\n\nAbstract:\nWe consider the possibility that some or all core-collapse supernovae are collapse-induced thermonuclear explosi ons (CITEs)\, rather than neutrino-driven explosions. Focusing on the neutr ino signal we show that the neutrino burst of SN1987A was compatible with C ITE and may hint at prompt black hole formation. Supernova constraints on n ew free-streaming particles (such as axions) would be avoided in this scena rio. LAST-MODIFIED:20200410T133932Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Kfir Blum\, Weizmann Institute of Science Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201209T160000Z DTEND:20201209T170000Z DTSTAMP:20260828T094430Z UID:0lnh0g58frosidlq3rdf508d55@google.com CREATED:20200930T162753Z DESCRIPTION:Speaker: Fourkas Group

Title: Literature Seminar for Mon a Abostate

Abstract: \;

ZOOM: \;https://umd.zoom.us/j/98023944100?pwd=ekMzZnYxeFkzaStUYzRDcX FUYndlZz09 LAST-MODIFIED:20200930T162855Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191115T165000Z DTEND:20191115T172000Z DTSTAMP:20260828T094430Z UID:285ge4dqra6fs08rss4ibri7sc@google.com CREATED:20191108T170730Z DESCRIPTION:*Please note changes to the usual location and time.\n\nTitle: Optical Enhancement of Superconductivity via Targeted Destruction of Charge Density Waves\n\nSpeaker: Hossein Dehghani\n\nFriday 15 November 12-12:30p m\n(pizza and drinks served 10 min. before talk)\n\nLocation: 2324 Atlantic Building\n\nAbstract: It has been experimentally established that the occu rrence of charge density waves is a common feature of various under-doped c uprate superconducting compounds. The observed states\, which are often fou nd in the form of bond density waves (BDW)\, often occur in a temperature r egime immediately above the superconducting transition temperature. Motivat ed by recent optical experiments on superconducting materials\, where it ha s been shown that optical irradiation can transiently improve the supercond ucting features\, here\, we propose a new approach for the enhancement of s uperconductivity by the targeted destruction of the BDW order. Since BDW st ates are usually found in competition with superconductivity\, suppression of the BDW order enhances the tendency of electrons to form Cooper pairs af ter reaching a steady-state. By investigating the optical coupling of gaple ss\, collective fluctuations of the BDW modes\, we argue that the resonant excitation of these modes can melt the underlying BDW order parameter. We p ropose an experimental setup to implement such an optical coupling using 2D plasmon-polariton hybrid systems. LAST-MODIFIED:20191113T180139Z LOCATION:2324 Atlantic SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191126T160000 DTEND;TZID=America/New_York:20191126T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191126T160000 CREATED:20190530T191015Z DESCRIPTION:Speaker: Xiangdong Ji\, University of Maryland

Exploring a quantum world travelling at the speed of light \ ;

What would the world look like if one travels at the speed of light？We began to seriously answer this type of question when studying the internal structure of the proton in high-energy scattering\, following the pioneering work of R. P. Feynman in 1969. With a high-energy Electron-Ion Collider (EIC) soon to be built in United States\, we are about to get prec ise 3D images of a light-travelling proton\, and to check them against exa- scale Euclidean&\;nbsp\;quantum chromodynamic calculations through a nov el theoretical construct: Large Momentum Effective Theory.

LAST-MODIFIED:20191120T210416Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190214T190000Z DTEND:20190214T203000Z DTSTAMP:20260828T094430Z UID:1kspj41838a8c1g5c9am1aj94r@google.com CREATED:20190213T145107Z DESCRIPTION:Title: "Nematic Enhancement of Superconductivity"\nSpeaker: Joh npierre Paglione\nAbstract:\nThe nematic phase\, wherein electronic degrees of freedom drive a reduction in crystal rotational symmetry\, is a common motif across a number of high temperature superconductors. The impact of ne maticity and nematic uctuations on the high Tc superconducting phase is com plicated\, however\, due to coexisence with long range magnetic order. I wi ll discuss the evolution of physical properties\, including elastoresistanc e\, in the (Ba\,Sr)Ni2As2 substitution series\, a new electronic nematic sy stem without magnetism or unconventional pairing. Our observation of a unid irectional charge density wave in the nematic phase of this series evokes c omparisons to nematicity in cuprate superconductors\, and a strong enhancem ent of the superconducting transition temperature appears to be driven by n ematic fluctuations\, establishing a promising route to higher superconduct ing critical temperatures.\nHost: Local LAST-MODIFIED:20190213T145107Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Johnpierre Paglione\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201120T170000Z DTEND:20201120T180000Z DTSTAMP:20260828T094430Z UID:7pmvupepr39ji2e76oktg6nu4c@google.com CREATED:20201112T132653Z DESCRIPTION:Title : Asymptotic freedom and non-perturbative photon-photon i nteractions in multi-mode circuit QED
Speaker : Nitish Mehta (JQI)
Ti me : 12 - 12:45pm\, Friday\, Nov. 20

Seminar will be held via Zoom:& nbsp\;https://umd.zoom.us/j/ 97099328991 \;and Meeting ID : 970 9932 8991


 \; In this work we explore \;the energy spectrum of a superconducting circ uit consisting of a single fluxonium atom coupled to a long section of 1-D transmission line. Owing to the strong anharmonicity of the fluxonium we un cover a new many-body effect\, dressing of photons by photons. Specifically \, fluxonium's local non-linearity leads to hybridization between one-photo n states and nearly resonant multi-photon states. \; Accounting for thi s effect requires deriving the correct multi-mode light matter coupling mod el of our circuit. We formulate the right model derived from circuit theory \, taking into account subtleties \;related to gauge-invariance and app arent divergence of physical observables. In particular\, gauge invariance is generally lost after truncating the Hilbert space\, which is inevitable for approximate calculation for multi-mode systems\, this can lead to unphy sical results. This problem can be largely ignored in the case of weakly an harmonic transmon atom\, which can be treated using a classical impedance f ormalism. Yet in the case of atoms with strong anharmonicity\, such as ours \, \; the choice of gauge is crucial and Hamiltonian parameters vary dr amatically from gauge to gauge. For example\, in the commonly used gauge wh ere the coupling is expressed in terms of the flux variable (flux gauge)\, the coupling constants grow with energy and the parameters of the atom depe nd on the number of transmission line modes used in calculation. In this ca se the high-energy truncation cannot be obviously justified. On the other h and when the coupling between the atom and transmission line modes is expre ssed in terms of charge variable (charge gauge)\, the atom parameters are n ot renormalized and the coupling constants \;drop to zero at high energ ies. We refer to this property as asymptotic freedom\, which justifies the high-energy truncation. The resulting light-matter model strongly deviates from the standard Ohmic bath. In fact\, in our truncation-friendly light ma tter coupling model\, the couplings grow at low energies\, and their values are in excellent agreement with the multi-photon spectroscopy data. \; LAST-MODIFIED:20201112T133204Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191015T150000Z DTEND:20191015T161500Z DTSTAMP:20260828T094430Z UID:4podkbak5sfabkqerdfnk73tsn@google.com CREATED:20190909T154843Z DESCRIPTION:Title: Exotic superconductivity in nearly ferromagnetic UTe2

Speaker: \; Johnpierre Paglione (UMD)

Abstract: Topological superconductivity has attracted great interest in condensed matter physics because of its potential applications in quantum computing. Spin-triplet s uperconductors are one promising class that can host the topological excita tions of interest\, but experimental realizations are few and far between. Here we report the discovery and properties of superconductivity in UTe2\, a material closely related to known ferromagnetic superconductors such as U Ge2\, URhGe\, and UCoGe\, but lacking long-range magnetic order. Several ex perimentally measured properties feature telltale indications of an unconve ntional energy gap and a spin-triplet pairing state that is consistent with the presence of strong magnetic fluctuations due to an incipient quantum c ritical point. Furthermore\, the superconductivity in UTe2 is remarkably ro bust to extremely high magnetic fields\, showing re-entrant pairing up to a t least 65 Tesla. I will review basic properties and our detailed investig ations of the gap structure\, relation to incipient magnetic order and Kond o coherence\, as well as indications of an anomalous normal state fluid tha t suggest many surprises await for this exotic material.

Condensed M atter Theory Center website:
http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190923T203335Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200227T160000Z DTEND:20200227T173000Z DTSTAMP:20260828T094430Z UID:6n5e87o8g9pt5kphv5pvc99apa@google.com CREATED:20200116T212141Z DESCRIPTION:Martha Constantinou\, Temple University\n\nTitle: "Evolution o f hadron structure from moments of PDFs & GPDs to their\nx-dependence"\n\nA bstract:\nLattice QCD (LQCD) is a theoretical non-perturbative approach for the\nstudy of QCD dynamics numerically from first principles. LQCD is\nwid ely used for hadron structure calculations and is becoming a\nreliable tool \, striving for control of various sources of systematic\nuncertainties. Pa rton distribution functions (PDFs) have a central\nrole in understanding ha dron structure and have been calculated in\nlattice QCD mainly via their Me llin moments. In this talk I will\npresent selected results for form factor s obtained from standard\nlattice techniques\, and discuss an alternative n ew method to access\nPDFs proposed by X. Ji in 2013. These are the so-calle s quasi-PDFs\,\nand can be matched to the light-cone PDFs using Large Momen tum\nEffective Theory (LaMET). The main focus of the talk is to demonstrate \nthe successes and challenges in this approach and the need for a\ncareful investigation of systematic uncertainties. Lattice data will\nbe compared against results from global fits of PDFs. Of particular\nimportance are the lattice results on the transversity PDFs\, which are\nnot well-constrained experimentally. In the third part of the talk\, I\nwill demonstrate how th e quasi-distributions approach can be extended\nfor the study of Generalize d Distribution Functions (GPDs). LAST-MODIFIED:20200220T193628Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181210T210000Z DTEND:20181210T220000Z DTSTAMP:20260828T094430Z UID:5dkm7ao24pr7fgd8hlfvka4p9g@google.com CREATED:20181029T150256Z DESCRIPTION:Title: Nanocoax: A Device Architecture for Bioelectronic Invest igations\n\nSpeaker: Michael Naughton\, Boston College\n\nNotes: http://www .marylandbiophysics.umd.edu/seminars/\n\nAbstract: \n\nWe discuss a nanosca le coaxial architecture with potential utility in nanophotonics\, photovolt aics\, neuroprosthetics\, and bioelectronic\, chemical and neuro sensing. A s subwavelength optical waveguides\, these nanostructures can be used in a range of nanoscale manipulations of light\, including optical nanoscopy and lithography\, high efficiency solar cells\, high electrode-density neuro-i mplants and discrete optical metamedia. A modification of the basic structu re enables the fabrication of highly sensitive molecular sensors and high r esolution bioelectronic probes\, including optoelectronic neurostimulators/ sensors (optrodes). We will report on aspects of these applications\, inclu ding radial p-n junction solar cells\, and bio\, electrochemical and neuro sensing. LAST-MODIFIED:20181126T142749Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190225T110000 DTEND;TZID=America/New_York:20190225T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190225T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Synthetic gauge fields with ultracold atoms in periodica lly-driven lattices\n\nSpeaker: Monika Aidelsburger\, Munich\n\nAbstract: Ultracold atoms in optical lattices are powerful experimental platforms to study a variety of phenomena ranging from condensed-matter to statistical p hysics. Recently\, a promising new direction was opened by the successful r ealization of paradigmatic topological condensed matter models\, in particu lar the Hofstadter and the Haldane model. I will introduce one of the most common experimental methods used to generate topological band structures in ultracold atoms\, i.e.\, Floquet engineering\, and report on recent result s as well as challenges regarding its application to many-body systems. The basic idea of the method is to periodically modulate the system's paramete rs to emulate the properties of a non-trivial static system. Floquet engine ering has further been proposed to engineer density-dependent gauge fields or even complete gauge theories\, which require an interaction between matt er and gauge fields. One example is the realization of Z2 lattice gauge the ories\, which play an important role in condensed matter physics and quantu m computation. Recently\, we have implemented such a model with a two-compo nent mixture of ultracold bosons in a double-well potential - the basic bui lding block of Z2 lattice gauge theories. LAST-MODIFIED:20190219T200738Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190923T203000Z DTEND:20190923T213000Z DTSTAMP:20260828T094430Z UID:79uh25t8btp1v4mg49ruqan713@google.com CREATED:20190906T030919Z DESCRIPTION:Title: Particle Heating and Turbulence in Low Beta Reconnection with a Guide Field\n\nSpeaker: Qile Zhang\, Department of Physics\, Univer sity of Maryland\n\nAbstract: Kinetic Riemann simulations are used to explo re particle heating and turbulence during reconnection with a guide field i n the low-beta environment of the inner heliosphere and the solar corona. T he reconnection exhaust is bounded by two rotational discontinuities (RDs) with two slow shocks (SSs) that form in the exhaust as in magnetohydrodynam ic (MHD) models. At the RDs\, ions are accelerated by the magnetic tension to drive the reconnection outflow and flows in the out-of-plane direction. The out-of-plane flows stream toward the midplane and meet to drive the SSs . The turbulence at the SSs is weak so the shocks are laminar and produce l ittle dissipation\, which differs greatly from the MHD treatment. Downstrea m of the SSs the counter-streaming ion beams lead to higher density and the refore to a positive potential that confines the downstream electrons to ma intain charge neutrality. The potential accelerates electrons from upstream of the SSs to downstream and traps a small fraction but only produces mode st electron heating. In the low-beta limit little energy goes to electrons. We explore the role of turbulence in the dynamics in greater depth. In 2D the exhaust develops large-amplitude striations resulting from electron-bea m-driven ion cyclotron waves. However\, in 3D the additional dimension resu lts in strong Buneman and electron-electron streaming instabilities at the RDs which suppress electron beam formation and therefore striations. The st reaming instabilities at the RD are more unstable with a lower ratio of the electron thermal speed to Alfven Speed. In 3D an ion-ion streaming instabi lity partially thermalizes the counterstreaming ion beams at the SSs. This instability will be stable with a low ratio of the sound speed to Alfven sp eed. The results suggest that when 1>>beta>m_e/m_i\, the kinetic-scale turb ulence that develops in the exhaust will be too weak to play a significant role in energy conversion. The results of heating and turbulence can be tes ted by Parker Solar Probe.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20190906T030919Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200908T171500Z DTEND:20200908T181500Z DTSTAMP:20260828T094430Z UID:6jvsj0brgg1fsq6rn9oujlg7j9@google.com CREATED:20200903T125206Z DESCRIPTION:Speaker: David Limmer\, UC Berkeley


Title: Large Dev iations in Nanoscale Transport Phenomena

Abstract:In this talk\, I w ill discuss some recent efforts to develop a molecular perspective on nanos cale transport\, including elucidating the molecular motions that underlie nonlinear response functions\, and molecular simulation techniques to study such processes on a computer. This work leverages recent advancements in a pplied mathematics in the study of large deviations and control theory\, as well as the burgeoning area of stochastic thermodynamics. Specific questio ns concerning anomalous heat transport in low dimensional lattices and nonl inear electrokinetic phenomena in ionic solutions will be addressed.

ZOOM: \;https://umd.zoom.us/j/94947 990670?pwd=VGo4K1BibFFldEZUM2xXSkFLSmQrdz09 LAST-MODIFIED:20200903T125206Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal for Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181010T193000Z DTEND:20181010T200000Z DTSTAMP:20260828T094430Z UID:1ktijtbclcp406vplv8co04u1s@google.com CREATED:20181003T193300Z DESCRIPTION:\n\nTitle : Changes in particle transport as a result of resona nt magnetic perturbations\nSpeaker Name: Prof. Saskia Mordijck\nSpeaker Ins titution : College of William and Mary\nNotes: Resonant magnetic perturbati ons (RMPs) have successfully been employed to suppress Edge Localized Modes (ELMs) in multiple Tokamak devices and are being considered as the main te chnique for mitigating and suppressing ELMs on ITER. RMPs are small steady- state magnetic perturbations that add a radial component to the equilibrium magnetic field. These small magnetic fields are optimized to be resonant w ith the rational surfaces at the plasma edge. RMPs reduce the large gradien ts at the plasma edge to values below the stability limit that is responsib le for the creation of ELMs. However\, adding RMPs to H-mode plasmas in DII I-D results in a strong reduction of the overall particle confinement\, a s o-called `density pump-out'. The effects of RMPs are thus not just limited to the plasma edge. In this talk\, I will first show how these RMPs create a stochastic edge and how a comparison between neoclassical theory and expe rimental observations can tell us something about the extent of the stochas tic layer. Next\, I will show that the creation of a stochastic layer is no t sufficient to explain the changes in particle confinement. Finally\, I wi ll show that the increases in turbulent transport are substantial and contr ibute to the overall decrease in particle confinement\, not just to a reduc tion in confinement at the plasma edge.\n LAST-MODIFIED:20181003T193326Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190916T203000Z DTEND:20190916T213000Z DTSTAMP:20260828T094430Z UID:31i7c467tuvu4eso76d1e7n9n0@google.com CREATED:20190817T035904Z DESCRIPTION:Title: The Onset of Magnetic Reconnection\n\nSpeaker: James Kli mchuk\, Heliophysics Division\, NASA Goddard Space Flight Center\n\nAbstrac t: Many phenomena on the Sun\, within the heliosphere\, and throughout the universe involve the explosive release of magnetic energy. Magnetic reconne ction is the process by which this occurs. A fundamental property of reconn ection that is not well understood is its "switch on" nature. It must remai n switched off to allow magnetic stresses to slowly build to sizable levels and then suddenly switch on to release the stored energy. If reconnection were operating efficiently all the time\, events like solar flares and coro nal mass ejections would be weak\, and nanoflares would not be able to main tain the hot temperatures of the corona. The onset of magnetic reconnection generally begins with the unstable tearing of electric current sheets. I w ill discuss recent magnetohydrodynamic (MHD) simulations showing how the no nlinear development of the tearing\, which controls how much energy is ulti mately released\, depends crucially on the length\, width\, and shear angle of the current sheet. We have identified three distinct and predictable ev olutionary paths that are set by the relative growth rates of the parallel and oblique modes of the initial linear tearing. I will discuss these new f indings and their relevance to solar phenomena.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20190817T035904Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200714T150000Z DTEND:20200714T160000Z DTSTAMP:20260828T094430Z UID:3t9tksc474jovla51su56oktdd@google.com CREATED:20200708T152213Z DESCRIPTION:Speaker: Jennifer Cano (Stony Brook/Flatiron Institute)

Title: Lattice dislocations as a probe of higher order topological insulato rs.

Abstract: Nonzero weak topological indices are thought to be a n ecessary condition to bind a single helical mode to a lattice dislocation. I will show that higher-order topological insulators (HOTIs) can\, in fact\ , host a single helical mode along screw or edge dislocations in the absenc e of weak topological indices. When this occurs\, the helical mode is neces sarily bound to a dislocation characterized by a fractional Burgers vector\ , macroscopically detected by the existence of a stacking fault. The robust ness of a helical mode on a partial defect is demonstrated by an adiabatic transformation that restores translation symmetry in the stacking fault. Si nce partial defects and stacking faults are commonplace in bulk crystals\, the existence of such helical modes can measurably affect the expected cond uctivity in these materials. I will also discuss our prediction of HOTIs in antiperovskites with spin-orbit coupling.

Host: Danny Bulmash
Zoom link: https://umd.zoom.us/j/96447408321?pwd=d2NDNDNIT3BEZkMwTW tDTEpBUjJQQT09

Email rcawthor@umd.edu for Zoom details \; LAST-MODIFIED:20200708T155953Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181005T160000Z DTEND:20181005T164500Z DTSTAMP:20260828T094430Z UID:7n1hk2pvmve3gi376khg90ri1q@google.com CREATED:20180925T202531Z DESCRIPTION:Title: Quantum electrodynamics of a superconductor-insulator ph ase transition\n\nSpeaker: Roman Kuzmin\, JQI and CNAM\n\nAbstract: A chain of Josephson junctions implements one of the simplest many-body models und ergoing a superconductor-insulator quantum phase transition between states with zero and infinite resistance. Apart from zero resistance\, the superco nducting state is necessarily accompanied by a sound-like phase mode due to collective oscillations of the phase of the complex-valued order parameter . Exciting the phase mode results in transverse photons propagating along t he chain. Surprisingly little is known about the fate of this mode upon ent ering the insulating state\, where the order parameter's amplitude remains non-zero\, but the phase ordering is “melted” by quantum fluctuations. I wi ll present momentum-resolved radio-frequency spectroscopy of collective mod es in nanofabricated chains of Al/AlOx/Al tunnel junctions. Our key finding is that the phase mode survives remarkably far into the insulating regime\ , such that chains with a MOhm-range DC resistance carry AC currents as nea rly ideal superconductors. At GHz-frequencies\, the insulator reveals itsel f by an intrinsic decoherence of collective modes and a scatter of their ei genfrequencies\, originating from coupling to quantum phase slips. Deep in an insulating state we observed waves propagation with the speed of light d own to 8*10^5 m/s and the wave impedance up to 23 kOhm\, with latter quanti ty exceeding predicted insulator transition values by an order of magnitude . Quite generally\, the existence of an extended phase mode in a bosonic in sulator realizes a 1D quantum electrodynamics with the fine structure const ant exceeding a unity\, promising potentially transformative applications i n quantum physics and technology.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20180925T202531Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201002T140000 DTEND;TZID=America/New_York:20201002T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201002T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;https:/ /umd.zoom.us/j/96514239009?pwd=bkpqS1V5Nnl4Qi9ML21TYVVWWVdYUT09#success


Speaker: Mikhail Stephanov\, UIC

Title: Deterministic ra ndomness in relativistic hydrodynamics

Abstract: We usually think of hydrodynamics as a deterministic
description of fluid motion. The focus of this talk is on random
fluctuations in hydrodynamics caused by therm al noise\, inherent
in a system with dissipation. The recent resurgence of interest
in this subject is driven by the progress in heavy-ion colli sion
experiments and\, in particular\, by the search for the QCD
crit ical point currently underway at the Relativistic Heavy-Ion
Collider. I will discuss how the fluctuations appear in
hydrodynamics and how we can describe their evolution in a
relativistic formalism. LAST-MODIFIED:20201001T123058Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181127T160000 DTEND;TZID=America/New_York:20181127T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181127T160000 CREATED:20180727T143919Z DESCRIPTION:\nTitle: Neutrino Astronomy at the South Pole with Ice Cube\n\n Speaker: Naoko Kurahashi Neilson\, Drexel University\n\nThe Universe has b een studied using light since the dawn of astronomy\, when starlight captur ed the human eye. The IceCube Neutrino Observatory\, located at the geograp hic South Pole\, observes the Universe in a different and unique way: in hi gh-energy neutrinos. IceCube's discovery in 2013 of a diffuse flux of astro physical neutrinos\, in other words\, isotropic high-energy neutrinos from beyond the solar system\, started an era of neutrino astronomy. This year\, spectacular multiwavelength observations were made that indicate the first astronomical source to emit such astrophysical neutrinos being identified. I will motivate why neutrinos are a necessary messenger in high-energy ast ronomy\, and review what these milestones mean. I will try to reconcile oth er IceCube analysis results to draw a coherent picture that is the state of neutrino astronomy. \n\nHost: Kara Hoffman LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200917T140000 DTEND;TZID=America/New_York:20200917T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201128T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20201001T140000 EXDATE;TZID=America/New_York:20200924T140000 EXDATE;TZID=America/New_York:20201008T140000 EXDATE;TZID=America/New_York:20201015T140000 EXDATE;TZID=America/New_York:20201022T140000 EXDATE;TZID=America/New_York:20201029T140000 EXDATE;TZID=America/New_York:20201105T140000 EXDATE;TZID=America/New_York:20201112T140000 EXDATE;TZID=America/New_York:20201126T140000 EXDATE;TZID=America/New_York:20200917T140000 DTSTAMP:20260828T094430Z UID:0v3o9l3m02p54p8ni8vfr55ikb@google.com CREATED:20200901T143302Z DESCRIPTION:Speaker: N. Peter Armitage\, John Hopkins University\nTitle: TB A\nAbstract: TBA\nHost: Paglione/ Greene\n\nFor the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20200901T143302Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: N. Peter Armitage TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190207T190000Z DTEND:20190207T203000Z DTSTAMP:20260828T094430Z UID:7on0ame1vh4qh0d5eeunvslu2s@google.com CREATED:20190130T185809Z DESCRIPTION:Title: "Multi-terminal Josephson effect in InAs/Al based hetero structure"\nSpeaker: Vladimir E. Manucharyan\nAbstract:\nEstablishment of p hase-coherence and a non-dissipative (super)current between two weakly coup led superconductors\, known as the Josephson effect\, plays a foundational role in basic physics and applications to metrology\, precision sensing\, h igh-speed digital electronics\, and quantum computing. The junction ranges from planar insulating oxides to single atoms\, molecules\, semiconductor n anowires\, and generally to any finite-size coherent conductor. Recently\, junctions of more than two superconducting terminals gained broad attention in the context of braiding of Majorana fermions in the solid state for fau lt-tolerant quantum computing\, and accessing physics and topology in dimen sions higher than three. Here we report the first observation of Josephson effect in 3- and 4-terminal junctions\, fabricated in a top-down fashion fr om a semiconductor/superconductor (InAs/Al) epitaxial two-dimensional heter ostructure. Due to interactions\, the critical current of an N-terminal jun ction becomes the boundary of an (N-1)-dimensional manifold of simultaneous ly allowed supercurrents. The measured shapes of such manifolds are explain ed by the scattering theory of mesoscopic superconductivity\, and they can be remarkably sensitive to the junction's symmetry class. Furthermore\, we observed a notably high-order (up to 8) multiple Andreev reflections simult aneously across every terminals pair\, which verifies the multi-terminal na ture of normal scattering and a high interface quality in our devices. Give n the previously shown gate-control of carrier density and evidence of spin -orbit scattering in InAs/Al heterostructures\, and device compatibility wi th other 2D materials\, the multi-terminal Josephson effect reported here c an become a testbed for physics and applications of topological superconduc tivity.\nHost: Local LAST-MODIFIED:20190131T132237Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Vladimir E. Manucharyan\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190522T150000Z DTEND:20190522T193000Z DTSTAMP:20260828T094430Z UID:6du8jjmre3atvb5gicpi42f08g@google.com CREATED:20190509T205440Z DESCRIPTION:Schedule (LINK TO ABSTRACTS)

11 :00AM Brian Swingle "Sparse SYK Model"

11:45AM Shenglong Xu "Quant um information dynamics in many-body systems"

2:00PM Will Cole "Simu lating capacitively-shunted Josephson junctions"

2:45PM Mike Schect er "Exact Quantum Many-Body Scars and Long-Range Spin-Nematic Order in Noni ntegrable XY Magnets"

website: https://www.physics.umd.edu/cmtc/semina rs.html LAST-MODIFIED:20190520T000655Z LOCATION:CMTC Conference Room (2205 John S. Toll Physics Bldg.) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Spring Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190212T160000 DTEND;TZID=America/New_York:20190212T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190326T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Patricia Falcone \, LLNL\n\nTitle: Science and Nationa l Security\n\nAbstract: The quality\, scope\, and impact of U.S. science an d technology is admired the world over. International scientific collabora tions highlight key values including evidence\, peer review\, transparency\ , teamwork\, and dialog. Scientific leadership and technological prowess a re also elements of national power and national security for the U.S. and f or other nations. Today\, roughly half of U.S. government funded research a nd development is carried out in support of national security missions. Su ch research is supported to enable the government to make informed assessme nts\, to develop and deploy defensive technology and systems\, and to under gird effective offensive systems. A perspective on effective approaches fo r reaping national security benefits from open science\, discovery\, applie d research\, and innovation will be offered with examples from some current dual use domains. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190417T150000Z DTEND:20190417T160000Z DTSTAMP:20260828T094430Z UID:05oo6mbubiun8plltdop0cquao@google.com CREATED:20190124T135652Z DESCRIPTION:Speaker: Professor Pablo Debenedetti\, Princeton University\, D epartment of Chemical and Biological Engineering\n\nTitle: Evaporation Tran sitions of Water in Nano-Scale Confinement: Fundamentals and Biophysical Im plications\n\nAbstract: The thermodynamic and kinetic behavior of water in nano-scale confinement plays an important role in biophysical phenomena suc h as hydrophobically-driven self-assembly. Using advanced sampling techniqu es\, we investigate computationally the rate\, mechanism\, and energetics o f evaporation transitions induced by hydrophobic confinement. We find a pro nounced sensitivity of the evaporation kinetics to the substrate’s mechanic al properties: a single order of magnitude reduction in the material’s modu lus causes the evaporation rate to increase by nine orders of magnitude. Th e underlying thermodynamics likewise suggests that it may be possible to se nsitively control the relative stability of the vapor and liquid phases by tuning substrate flexibility. These findings may have implications for the function of membrane-bound protein assemblies. LAST-MODIFIED:20190409T134734Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200917T140000 DTEND;TZID=America/New_York:20200917T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201128T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20201022T140000 EXDATE;TZID=America/New_York:20201112T140000 EXDATE;TZID=America/New_York:20201105T140000 EXDATE;TZID=America/New_York:20201126T140000 EXDATE;TZID=America/New_York:20201119T140000 DTSTAMP:20260828T094430Z UID:6c97242o10on11bu7oc0egkhcm@google.com CREATED:20201022T150144Z DESCRIPTION:Speaker: Andrew Christianson\, Oak Ridge National L aboratory


Title: QuantumMagnetism in the Honeycomb Lattice Mater ial YbC    

Abstract:
Inquantum magnetism\, deceptively simple mo del systems exhibit rich behavior thatenables the testing of fundamental id eas which intern serve as the basis forunderstanding and identifying more c omplex behavior.  In this talk\, I will focus on the physics ofthe honeycom b lattice Heisenberg model as probed experimentally by inelasticneutron sca ttering.  The honeycomblattice Heisenberg model is simple:  onlynearest nei ghbor Heisenberg interactions are considered\; there is nofrustration\, and the ground state at T=0 is the Néel state. The model material discussed he re is the rare earth halide YbCl3.  YbCl3 exhibits a broad peak in theheat capacity at 1.8 K and very weak but sharper transitio n at 0.6 Kcorresponding to the onset of magnetic order. We have determined the crystal field Hamiltonian through simultaneousrefinements of inelastic neutron scattering and magnetization data. The groundstate doublet of the c rystal field Hamiltonian is well isolated and results inan effective spin-1 /2 system. The low energy excitation spectrum consists of conventionalspin waves and an unusually sharp feature within a broad continuum.  By includin g both transverse and longitudinalchannels of the neutron response\, linear spin wave theory with a singleHeisenberg interaction (J ~ 0.42 meV) on the honeycomb lattice reproduces allof the key features in the spectrum.  Inpa rticular\, the broad continuum corresponds to a two-magnon contribution fro mthe longitudinal channel\, while the sharp feature within this continuum i sidentified as a Van Hove singularity in the joint density of states. Theex perimental demonstration of a Van Hove singularity in a two-magnon continuu mis important as a confirmation of basic notions of continua in quantummagn etism and additionally because analogous features in two-spinon continuacou ld potentially be used to distinguish quantum spin liquids from merelydisor dered systems.   


Host: N. Butch

For the zoom link please email Kristin Stenson at QMC@ umd.edu LAST-MODIFIED:20201022T150144Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Andrew Christianson\, Oak Ridge National Laborator y TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200228T180000Z DTEND:20200228T190000Z DTSTAMP:20260828T094430Z UID:5t6404k1dsvo8dehetrt6f6uad@google.com CREATED:20200122T134421Z DESCRIPTION:Speaker: Matthew Mecklenburg\, University of Southern Californi a\n\nTitle: Understanding Nanoscale Transport at Interfaces and Defects Usi ng in Situ Transmission Electron Microscopy\n\nAbstract: Transmission elect ron microscopy (TEM) is a powerful tool for studying interfaces and defects down to the atomic scale. Image contrast in a TEM is dominated by changes in crystal orientation\, atomic number\, and mass thickness. But new contra st mechanisms can be found by precision measurements of plasmon excitations \, the lattice parameter\, and charge compensating currents. New imaging te chniques with nanoscale spatial resolution can detect contrast changes that relate to temperature\, electrical potential\, and pressure. These scalar fields have gradients that produce thermal\, electrical\, and mass transpor t. Thus\, applying these new techniques to map these scalar fields allows u s correlate transport to interfaces and defects in nanostructured materials . One goal is to use precision measurements to map temperature in transisto rs and help understand how to mitigate the enormous heat produced from elec tronics on the scale of server farms down to cellular phones. The ubiquitou s transistor produces temperature gradients of kelvins per nanometer. The i nterface around the sub-10 nm wide gate and semiconductor components preven ts diffusive transport in favor of ballistic transport\, requiring high spa tial resolution measurements of temperature change to observe this crossove r. LAST-MODIFIED:20200217T141151Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191121T190000Z DTEND:20191121T200000Z DTSTAMP:20260828T094430Z UID:019175r0ip875l3i8h73guic6k@google.com CREATED:20191016T200427Z DESCRIPTION:Title: Enhancing superconductivity using quantum optics toolbox \nSpeaker: Mohammad Hafezi\, University of Maryland\n\nAbstract: \nIt has b een experimentally established that the occurrence of charge density\nwaves is a common feature of various under-doped cuprate superconducting\ncompou nds. The observed states\, which are often found in the form of bond\ndensi ty waves (BDW)\, often occur in a temperature regime immediately above the\ nsuperconducting transition temperature. Motivated by recent optical experi ments\non superconducting materials\, where it has been shown that optical irradiation\ncan transiently improve the superconducting features\, here\, we propose a new\napproach for the enhancement of superconductivity by the targeted destruction\nof the BDW order. Since BDW states are usually found in competition with\nsuperconductivity\, suppression of the BDW order enhan ces the tendency of\nelectrons to form Cooper pairs after reaching a steady -state. By investigating\nthe optical coupling of gapless\, collective fluc tuations of the BDW modes\, we\nargue that the resonant excitation of these modes can melt the underlying BDW\norder parameter. We propose an experime ntal setup to implement such an optical\ncoupling using 2D plasmon-polarito n hybrid systems.\nhttps://arxiv.org/abs/1909.09689 \n\nHost: (local)\n\nRe freshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20191025T140754Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Mohammad Hafezi\, University of Maryland TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200127T210000Z DTEND:20200127T223000Z DTSTAMP:20260828T094430Z UID:73qocevmd4of75jp6md1oqhlh1@google.com CREATED:20200106T164844Z DESCRIPTION:Davide Racco\, Perimeter Institute \n\nTitle: Minimal signatur es of the Standard Model in cosmological collider physics\n\n\nAbstract: Th e detection of an oscillating pattern in the bispectrum of density perturba tions would imply the presence of heavy particles at a scale close to the H ubble rate during inflation. A minimal scenario providing this signature on ly requires a coupling of SM particles to the inflaton. We focus on the fer mions\, whose dispersion relation can be modified by the coupling to the in flaton\, leading to an enhanced particle production even if their mass duri ng inflation is larger than the Hubble scale.\nWe study two particularly in teresting cases. The detection of the simultaneous contributions of two SM fermions to the bispectrum would allow us to conclude that the Higgs field during inflation resided in a second minimum of its potential located at hi gh scales.\nAnother remarkable possibility is that the Higgs vacuum during inflation is dynamically set by the contribution of the fermion density to the Higgs potential. This one-parameter model offers a very minimal and pre dictive signature detectable in cosmological collider physics. LAST-MODIFIED:20200109T162012Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200206T123000 DTEND;TZID=America/New_York:20200206T133000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200516T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20200319T123000 EXDATE;TZID=America/New_York:20200430T123000 EXDATE;TZID=America/New_York:20200402T123000 EXDATE;TZID=America/New_York:20200409T123000 EXDATE;TZID=America/New_York:20200514T123000 EXDATE;TZID=America/New_York:20200423T123000 EXDATE;TZID=America/New_York:20200416T123000 EXDATE;TZID=America/New_York:20200507T123000 EXDATE;TZID=America/New_York:20200326T123000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com CREATED:20200109T211506Z DESCRIPTION:Title: TBA\nSpeaker: TBA\nInstitution TBA | Unit TBA\n\nAbstrac t: TBA LAST-MODIFIED:20200109T212321Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191209T110000 DTEND;TZID=America/New_York:20191209T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191209T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Quantum thermodynamics with superconducting circuits \n \nSpeaker: Kater Murch\, Washington University in St. Louis \n\nAbstract: Superconducting circuits offer an interesting platform with which to explor e thermodynamics at the quantum level. In particular\, the ability to perfo rm high efficiency quantum measurements and track quantum evolution enables novel experiments in measurement and feedback which form the basis of Maxw ell's Demon. These experiments elucidate the role of quantum information in thermodynamics. Furthermore\, the quantum dynamics associated with contin uous measurement allow us to characterize the arrow of time by examining th e statistical likelihood of certain measurement processes. By experimentall y tracking individual weak measurement trajectories\, we compare the path p robabilities of forward and backward-in-time evolution to develop an arrow of time statistic associated with measurement dynamics. We show that the ar row of time statistic obeys both detailed and integral fluctuation theorems thus establishing the consistency between microscopic and macroscopic meas urement dynamics. LAST-MODIFIED:20191127T160548Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200915T171500Z DTEND:20200915T181500Z DTSTAMP:20260828T094430Z UID:3b46rr0mf36g4en7qkk8pq9ade@google.com CREATED:20200910T164052Z LAST-MODIFIED:20200910T164052Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191210T210000Z DTEND:20191210T220000Z DTSTAMP:20260828T094430Z UID:35m2h3kr0c3tn65scpdh53cpis@google.com CREATED:20190910T151156Z DESCRIPTION:\nSpeaker: Kater Murch\, WUSTL\n\nTitle: Quantum dynamics of c omplex energies.\n\nAbstract: The evolution of a quantum system is governed by its discrete energies. These energies are almost always assumed to be r eal\, as is guaranteed by Hermiticity of the system Hamiltonian. I will pre sent our recent experiments that explore the consequences of complex energ ies\, allowing non-Hermitian dynamics\, which include novel features arisin g from the topology of the Riemann manifolds that describe complex energies . The degeneracies that occur with these non-Hermitian Hamiltonians are kno wn as exceptional points. Our observations demonstrate rich phenomena assoc iated with non-Hermitian physics and exceptional points such as non-orthogo nality of eigenstates in a fully quantum regime and open routes to explore and harness exceptional point degeneracies for enhanced sensing and quantum information processing. LAST-MODIFIED:20191127T160617Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191206T180000Z DTEND:20191206T190000Z DTSTAMP:20260828T094430Z UID:70msb1ud760kugo6oqg7cji3an@google.com CREATED:20190905T134529Z LAST-MODIFIED:20190905T134529Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMINAR - DEPARTMENTAL MEETI NG TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191008T171500Z DTEND:20191008T181500Z DTSTAMP:20260828T094430Z UID:353o6quqo95vrm6utb99jpmn7r@google.com CREATED:20190910T135444Z DESCRIPTION:Speaker: Dr. Justin Elenewski\, UMD and NIST\n\nTitle: Landscap es\, Nonlinearity\, and Biomolecular Energy Redistribution\n\nAbstract: Alt hough selective energy redistribution is critical to the function of numero us biomolecules and functional nanomaterials\, the processes mediating thes e dynamics remain a poorly understood facet of nonequilibrium thermodynamic s. In this talk\, I will discuss how topological features\, nonlinearities\ , and energy landscape architecture can collude to define biomolecular heat propagation. Our exhaustive all-atom simulations and novel local-in-time a nd space analysis - which is equally applicable to both theory and experime nt - permit the multiscale dissection of energy migration in biomolecules. Unlike transport through small-molecule systems\, we find that nonlinearity dominates over coherent processes at even at short length- and time-scales . Leveraging these observations\, I will demonstrate how vibrational energy transport can probe otherwise inaccessible aspects of macromolecular dynam ics and the interactions that underlie biological function. LAST-MODIFIED:20191001T165155Z LOCATION:1116 IPST Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160919T110000 DTEND;TZID=America/New_York:20160919T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20160919T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Frank Wilczek\n\nSpeaker Institution: Massachuset ts Institute of Technology\n\nTitle: Anyons\n\nAbstract: For many years it was thought that bosons and fermions exhaust the possibilities for quantum statistics. But deeper analysis uncovered new possibilities: anyons. An yons of several kinds occur in models of condensed matter. Their study in volves deep ideas from topology and exotic corners of quantum mechanics. To date most work on anyons has been theoretical\, but experiments are catc hing up. I'll survey all this\, including very recent work on spin liquid s. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201013T200000Z DTEND:20201013T210000Z DTSTAMP:20260828T094430Z UID:143rd7ig9n06e8ljl3j21qtg60@google.com CREATED:20200929T121300Z DESCRIPTION:

The UMD Department of Chemistry &\; Biochemistry cord ially invites you to the inaugural TOBIN J. MARKS LECTURE IN C HEMICAL DISCOVERY with STANLEY WHITTINGHAM\, 2019 Nobel Laureate in Chemistry on "\;T HE ORIGINS OF THE LITHIUM BATTERY AND FUTURE CHALLENGES / OPPORTUNITIES&quo t\;

Tuesday\, October 13\, 2020 at 4 p.m. EST

The lecture will be hosted on Zoom. Registration is requir ed.

Register at go.umd.edu/markslecture2020

Abo ut the Talk:
Lithium-ion batteries came from an idea in 1972 to dominate electrochemical energy storage today. They are now in a position to enable the large-scale introduction of renewable energy\, as well as ele ctrifying transportation\, which will leave a cleaner and more sustainable environment for the next generation. There are ample scientific opportuniti es to further improve the performance and safety. Today’s cells attain only 25% of their theoretical value. However\, as the energy density increases\ , the safety tends to be compromised. Examples will include: the soft TiS2 lattice\, the layered oxides\, LiMO2\, and Li2VOPO4\, a proof of concept for a two-electron transfer. Thes e opportunities and the technical challenges that need to be overcome will be described to open up a discussion.

About the Speaker:
M. Stanley Whittingham is a SUNY distinguished professor of chemist ry and materials science and engineering at SUNY Binghamton and the 2019 Ch emistry Nobel Laureate. He received his B.A. and D.Phil. degrees in chemist ry from Oxford University\, where he is an honorary Fellow of New College. He has been active in Li-batteries since 1971 when he won the Young Author Award of the Electrochemical Society for his work on the solid electrolyte beta-alumina. In 1972\, he joined Exxon’s Corporate Research Laboratory and discovered the role of intercalation in battery reactions\, which resulted in the first commercial lithium rechargeable batteries that were built by Exxon Enterprises. In 1988\, he returned to academia at SUNY Binghamton to initiate a program in materials chemistry. He initiated a graduate program in Materials Science and Engineering.

He was awarded a JSPS Fellowshi p in the Physics Department of the University of Tokyo in 1993. From 1993 t o 1999\, he was vice-provost for research. In 2004\, he received the Batter y Division Research Award. He is presently director of the NECCES EFRC base d at Binghamton. In 2012\, he received the Yeager Award of the Internationa l Battery Association for his lifetime contributions to battery research\; in 2015\, he received the Lifetime Contributions to Battery Technology awar d from NAATBaaT\; in 2017\, he received the Senior Research Award from Soli d State Ionics\; and in 2018\, was elected a member of the National Academy of Engineering and received the Turnbull Award from MRS. He is a Fellow of both the Electrochemical Society and the Materials Research Society. He is vice-chair of the board of directors of the New York Battery and Energy St orage Technology Consortium (NYBEST).

About the Lecture:
Tobin J. Marks (B.S. '\;66\, chemistry)\, Northwestern Universit y'\;s Charles E. and Emma H. Morrison Professor of Chemistry\, Professor of Materials Science &\; Engineering\, and the Vladimir N. Ipatieff Pro fessor of Catalytic Chemistry\, established the Tobin J. Marks Endowed Lect ureship in Chemical Discovery at UMD in 2016. The 2017 ACS Priestley Medali st\, Marks has distinguished himself as one of the most prolific chemists i n the world through his innovative and interdisciplinary research in inorga nic\, organic and materials chemistry. The lecture is hosted by the Departm ent of Chemistry and Biochemistry in the College of Computer\, Mathematical \, and Natural Sciences.

LAST-MODIFIED:20200929T121300Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Tobin J. Marks Endowed Lectureship in Chemical Discovery TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190418T123000 DTEND;TZID=America/New_York:20190418T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190418T123000 CREATED:20190115T151128Z DESCRIPTION:Title: The physical processes of brain waste removal\nSpeaker: Douglas Kelley\nUniversity of Rochester | Department of Mechanical Engineer ing\n\nAbstract: The human brain accounts for just 2% of the body's mass bu t metabolizes 25% of its calories\, producing significant metabolic waste. However\, waste buildup links to neurodegenerative diseases like Alzheimer' s and Parkinson's. The brain removes waste via the recently-discovered glym phatic system\, a combination of spaces and channels through which cerebros pinal fluid flows to sweep away toxins like amyloid-beta. With an interdisc iplinary group of neuroscientists and physical scientists\, I study the phy sical processes of the glymphatic system: Where does fluid flow\, and how f ast? What drives flow? Does flow shear cause waste accumulation? What chara cteristics of the system enable essential functions? How can we improve was te removal? Can we use glymphatic flow to deliver drugs? The team combines physics tools like particle tracking and newly-invented front tracking with biological tools like two-photon imaging through cranial windows in order to address these questions with in vivo flow measurements. I will talk abou t recent results showing that glymphatic flow proceeds along vessels with n ear-optimal shapes\, pulses with the heart\, is driven by artery walls\, an d can be manipulated by changing the wall motion. LAST-MODIFIED:20190115T161352Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200921T190000Z DTEND:20200921T203000Z DTSTAMP:20260828T094430Z UID:7frf4dlh5sc7kld4dgqjtp00df@google.com CREATED:20200814T140258Z DESCRIPTION:Seminar to be conducted via Zoom.

Speaker: Jae Hyeok Cha ng\, UMD

Title: Exotic Compact Objects in a Dissipative Dark Sector< br>
Abstract:
We study the complete history of structure formation of a simple
dark sector and show how to form exotic compact objects that v ary
in size from a few to millions of solar masses. These exotic compact

objects may be detected and their properties measured at new high-< br>precision astronomical observatories\, giving insight into the particle< br>
nature of the dark sector without the requirement of non-gravitation al
interactions with the visible sector.

For the zoom link please contact mknouse@umd.edu LAST-MODIFIED:20200916T194937Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191204T160000Z DTEND:20191204T170000Z DTSTAMP:20260828T094430Z UID:32eke110cbfkklq25csav34rkg@google.com CREATED:20190910T142129Z LAST-MODIFIED:20191127T151554Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191022T160000 DTEND;TZID=America/New_York:20191022T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191022T160000 CREATED:20190530T191015Z DESCRIPTION:Speaker: Raju Venugopalan (Brookhaven National Laboratory)\n\n Title: The glue that binds us all: lifting the veil on emergent universal dynamics in nature's strong force at high energies\n\nAbstract:\nMassless g luons are responsible for nearly all of the mass of the visible universe. A fter a brief survey of their remarkable \nproperties\, we outline how gluon matter at high energies can be described by a strongly correlated many-bod y theory with universal dynamics \nthat bears striking parallels to systems in statistical mechanics and to a memory effect carried by gravitational waves. When heavy nuclei collide at ultra relativistic energies\, \nWeibel- like instabilities drive the matter to decohere and flow to a nonthermal fi xed point before forming a perfect fluid on parametrically long time scales . \nThis nonthermal fixed point of the hottest terrestrial fluid (T= trilli on Kelvin) is universal and can be quantum simulated by cold atomic gases ( T=nano Kelvin). LAST-MODIFIED:20191004T133755Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191121T160000Z DTEND:20191121T173000Z DTSTAMP:20260828T094430Z UID:4ve63okmdu3t04bjhgejpiddbq@google.com CREATED:20190820T190940Z DESCRIPTION:Maria Piarulli\, Washington University in St. Louis\n\nTitle: F rom light-nuclei to neutron matter within chiral dynamics\n\nAbstract: A m ajor goal of nuclear theory is to explain the wealth of data and peculiarit ies exhibited by nuclear systems in a fully microscopic approach. In such a n approach\, which we refer to as the basic model of nuclear theory\, the n ucleons interact with each other via many-body (primarily\, two- and three- body) effective interactions\, and with external electroweak probes via eff ective currents describing the coupling of these probes to individual nucle ons and many-body clusters of them. These effective interactions and curren ts are the main inputs to ab-initio methods that are aimed at solving the m any-body Schr ̈odinger equation associated with the nuclear system under co nsideration. In this talk\, I will review recent progress in Quantum Monte Carlo calculations of low-lying spectra and electroweak properties of light nuclei as well as nucleonic matter equation of state. Emphasis will be on calculations based on chiral effective field theory approach. LAST-MODIFIED:20191108T193341Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190325T193000Z DTEND:20190325T203000Z DTSTAMP:20260828T094430Z UID:0g9ph8ogvpja6jiat459ml6q8u@google.com CREATED:20190314T184126Z DESCRIPTION:Title : Primordial Black Holes as Dark Matter Candidates\n\n\nS peaker Name: Cristiano Germani\, University of Barcelona \n\nAbstract : In this talk I will overview the physics of primordial black holes formation a nd discuss their statistical distribution. LAST-MODIFIED:20190314T184126Z LOCATION:PSC 1136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200914T200000Z DTEND:20200914T210000Z DTSTAMP:20260828T094430Z UID:4rjnq08pp6u0rg7r6ecgjn18td@google.com CREATED:20200826T155255Z DESCRIPTION:Speaker: \;Prof. Syma Khalid\, \;Unive rsity of Southampton - UK \;

Title: Focusing the Comp utational Microscope on Bacterial Cell Envelopes

Abstract: Th e cell envelopes the protect Gram-negative bacteria are complex\, multicomp artment molecular architectures. But in order to defeat harmful\, disease-c ausing bacteria it is imperative that we unravel the structure-dynamics mys teries of these cell envelopes. To this end we have developed atomistic-lev el models of the two membranes and cell wall that constitute the cell envel ope of \;E. coli. Our simulations have begun to provide some ins ights into the dynamic interplay between the different components and the s tructural consequences of these dynamics. At a more coarse-grain level\, we have recently started looking at how outer membrane vesicles\, which are s hed by all bacterial studied to date\, interact with model plasma membranes . Our large simulations of systems of millions of particles are beginning t o provide insights into steps that are important in the process of infectio n. I will discuss both the atomistic and coarse-grain strands of our work i n this presentation.

Topic: B iophysics Seminar
Time: Sep 14\, 2020 04:00 PM Eastern Ti me (US and Canada) \;  \;
Join Zoom Meeting
https://um d.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
Meeting ID: 926 8220 2606
Passcode: 741889 LAST-MODIFIED:20200909T150555Z LOCATION:Online using Zoom Meeting -- please see information below SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200918T140000 DTEND;TZID=America/New_York:20200918T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20200918T140000 CREATED:20200827T172634Z DESCRIPTION:Speaker: David Kaplan\, University of Washington/Institute of N uclear Theory

Seminar will be conducted via zoom: \;https://umd.zoom.us/j/96514239009?pwd=bkpqS1 V5Nnl4Qi9ML21TYVVWWVdYUT09#success

Title: Con vergence of nuclear effective field theory with perturbative pions

A bstract: I revisit the question of convergence of the KSW expansion brought into question by the paper of Fleming\, Mehen and Stuart (1999). In that paper the authors saw poor convergence at second order in the expansion for the spin-triplet channel\, and noted that the problems seemed to arise fro m certain graphs\, persisting in the chiral limit. In order to investigate this more closely\, I reconsider that class of problematic graphs\, equival ent to solving the Schrodinger equation perturbatively in the chiral limit. I show that it is possible to turn the calculation into an iterative algeb raic problem\, allowing one to easily compute the scattering amplitudes in all partial waves to high order. This allows one to see clearly where the expansion breaks down\, and to connect it to observations by Birse who used atomic physics techniques to determine the radius of convergence of the ex pansion in each channel. This work suggests that one should consider a gene ralization of the renormalization group to a sort of "running angular momen tum" and clarifies mathematically what an improvement of the KSW expansion must achieve -- the explicit removal of a branch cut -- to extend the valid iity of the expansion. LAST-MODIFIED:20200917T130524Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201012T200000Z DTEND:20201012T213000Z DTSTAMP:20260828T094430Z UID:4clcqioollt4710ul09gscn6gl@google.com CREATED:20200909T180338Z DESCRIPTION:Speaker: Shukai Ma\, UMD


Title: Reservoir Computing in Chaotic Wave-based Systems


Abstract: \;

Th e execution of machine learning (ML) software largely depends on the comput ing `substrate'\, which is often not optimized for running ML tasks. The in vention of ML-tailored hardware may greatly improve the computing speed and power efficiency. Photonic devices are well-suited for ML due to the paral lelism of light. Reservoir computing (RC) is essentially a one-layer neural network (NN) with nonlinear connections\, but radically simpler than NN si nce only the coupling between the reservoir nodes and outputs is trained.&n bsp\;

Here we utilize the complicated wave dynamics inside a chaotic-shaped electromagnetic cavity containing nonlinear elements to emu late the complex dynamics of an RC. Due to the short-wavelength property of the waves\, their equivalent ray-propagation is chaotic. We propose unique techniques to create virtual RC nodes by both frequency stirring and spati al perturbation. The computational power of the wave chaotic RC is experime ntally demonstrated with the so-called observer task. Different tasks are e xecuted with a single RC physical device by simply switching output coupler s. Since such systems are widely encountered in multiple settings (electrom agnetics\, quantum mechanics\, acoustics\, etc.)\, the work is of interest to many researchers in the physics and engineering communities.


This work is supported by ONR Grants No. N000141512134\, No. N00014 1912481\, and AFOSR COE Grant FA9550-15-10171.


Advisor: Anlage Group

Zoom Link \; &\; \; \;Log In Information


https://umd.zoom.us/s/91198037643

Meeting ID: 911 9803 7643 \;

Password:558484

LAST-MODIFIED:20201006T191950Z LOCATION:Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Shukai Ma\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181109T233000Z DTEND:20181110T003000Z DTSTAMP:20260828T094430Z UID:1e3pbabscd2l775ha864imdmbk@google.com CREATED:20181105T161018Z DESCRIPTION:Have you every wondered how your GPS always knows exactly where you are? Or how scientists search for life on other planets? Come out this Friday evening to learn the answers to these questions and more with Physi cs Nobel Laureates Dr. William D. Phillips and < a href="https://www.nobelprize.org/prizes/physics/2006/mather/auto-biograph y/" target="_blank">Dr. John C. Mather.
This lecture is part of the 2018 APS Mid-Atlantic Annual Meeting at the Edward St. John Center.

Parking is free after 4 pm at several locations on campus. Regents Garage is just a 5 min walk to the talk location.
 \;https://www.dots.umd.edu/maps&\;apps.html LAST-MODIFIED:20181105T163300Z LOCATION:0202 Edward St. John Learning and Teaching Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics for All public lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191211T160000Z DTEND:20191211T170000Z DTSTAMP:20260828T094430Z UID:41b5ll7u9rg6onn62ebbl4faks@google.com CREATED:20191203T141722Z LAST-MODIFIED:20191203T141722Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181108T190000Z DTEND:20181108T203000Z DTSTAMP:20260828T094430Z UID:2oar8ftb6rviumfj0pi72ff4jr@google.com CREATED:20180823T193637Z DESCRIPTION:Title: Organized Brownian Motion in Freestanding Graphene: A Ne w Thermal Force\n\nSpeaker: Paul Thibado\, University of Arkansas\n\nAbstra ct:\n\nIn his renowned 1964 lecture series\, Richard Feynman argued that ob taining useful work from Brownian motion is impossible\, citing detailed ba lance and the second law of thermodynamics. Effectively\, his point was tha t connecting a resistor to a diode will not generate a direct current [1]. Considering the noise voltage of a resistor is at best 500 micro-volts\, wh ile forward bias requires a minimum of 0.7 volts\, this is a reasonable inf erence. The question is\, in the fifty years since Feynman’s talk\, has a s ystem been found that has a noise voltage larger than forward bias [2]? In our current studies of the continuous motion of freestanding graphene\, we have discovered such a system\, with a noise voltage in excess of 50 volts. As a freestanding monolayer\, graphene isn’t flat\; instead\, it features alternately concave and convex ripples\, forming its characteristic “egg ca rton” contours. Interestingly\, these ripples undergo spontaneous curvature inversion in response to the ambient temperature [3]. As each ripple flips from concave to convex\, more than 10\,000 atoms move coherently in the sa me direction\, creating an extremely large force [4]. We have converted thi s collective thermal motion into stored electrical charge using a variable- capacitance machine [5]. This brings to mind another well-known assertion b y Feynman: he stated that there is “plenty of room at the bottom” as he cha llenged scientists to successfully develop tiny motors. \n\n[1] L. Brilloui n\, CAN THE RECTIFIER BECOME A THERMODYNAMICAL DEMON\, Physical Review\, 78 (1950) 627-628.\n[2] M.O. Magnasco\, FORCED THERMAL RATCHETS\, Physical Re view Letters\, 71 (1993) 1477-1481.\n[3] P. Xu\, M. Neek-Amal\, S.D. Barber \, J.K. Schoelz\, M.L. Ackerman\, P.M. Thibado\, A. Sadeghi\, F.M. Peeters\ , Unusual ultra-low-frequency fluctuations in freestanding graphene\, Nat. Comm.\, 5 (2014) 3720.\n[4] M.L. Ackerman\, P. Kumar\, M. Neek-Amal\, P.M. Thibado\, F.M. Peeters\, S. Singh\, Anomalous Dynamical Behavior of Freesta nding Graphene Membranes\, Physical Review Letters\, 117 (2016) 126801.\n[5 ] S.F. Philp\, Vacuum-Insulated\, Varying-Capacitance Machine\, IEEE Transa ctions on Electrical Insulation\, 12 (1977) 130-136.\n\n\nHost: Einstein\n\ n\nRefreshments Served at 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20181024T182426Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Paul Thibado\, University of Arkansas TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181115T180000Z DTEND:20181115T193000Z DTSTAMP:20260828T094430Z UID:1h1la28hnqfqjakq9v22oefd3m@google.com CREATED:20180828T143622Z DESCRIPTION:Title: Hot and Dense Neutron-Rich Matter in Supernovae and Neut ron Star Mergers\n\nSpeaker: Jeremy Holt\, Texas A&M\n\nAbstract: The equat ion of state\, transport and linear response properties of hot and dense ne utron-rich matter created in core-collapse supernovae and neutron star merg ers directly affect the observable electromagnetic\, neutrino\, and gravita tional wave signals as well as the possibility for r-process nucleosynthesi s in the ejected matter. In this talk I will describe recent progress in co nstructing a thermodynamic equation of state of nuclear matter based on the low-energy realization of QCD\, chiral effective field theory\, which inco rporates realistic microphysics such as multi-pion exchange processes and t hree-body forces. Bulk properties of zero-temperature symmetric nuclear mat ter around saturation density are shown to be well described without additi onal fine tuning\, as are selected thermodynamic observables. We present as well a new Bayesian method for inferring neutron star properties\, such as radii and tidal deformabilities\, from a combination of nuclear theory and experiment. LAST-MODIFIED:20181106T162253Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181015T190000Z DTEND:20181015T203000Z DTSTAMP:20260828T094430Z UID:4miqsdhd4ss9tiiutc9o8hmsb2@google.com CREATED:20181008T142344Z DESCRIPTION:Title: On lepton flavor universality violations\n\nSpeaker: Jur e Zupan\, University of Cincinnati\n\nAbstract: I will review the hints of experimental anomalies in b -> c tau nu and b -> s mu+ mu- transitions that point to lepton flavor universality violations. In the talk I will take th ese hints seriously and review the possible explanations in term of new phy sics models. LAST-MODIFIED:20181008T142344Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170504T143000Z DTEND:20170504T153000Z DTSTAMP:20260828T094430Z UID:6h4uptf3tiljobm3gjbktl4vdg@google.com CREATED:20170428T202619Z DESCRIPTION:Speaker: Timothy Hsieh (KITP) \n\nTitle: Topological Bootstrap: From Free Fermions to Fractionalization and Fractons\n\nAbstract: I will p resent a route toward realizing fractionalized topological phases of matter by literally building on un-fractionalized phases. This approach involves a Kondo lattice model in which a gapped electronic system of non-interactin g fermions is coupled to non-interacting local moments via the exchange int eraction. Using general entanglement-based arguments and explicit lattice m odels\, I will show that in this way gapped spin liquids can be induced in the spin system. I will use this technique\, dubbed the "topological boots trap"\, to develop parton constructions for exotic\, "fracton" topological phases in three dimensions. \n\nHost: Victor Galitski LAST-MODIFIED:20200108T224606Z LOCATION:2205 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190416T171500Z DTEND:20190416T181500Z DTSTAMP:20260828T094430Z UID:7h6d7r8g4eck0pud0njcbb2ilg@google.com CREATED:20190124T134707Z DESCRIPTION:Speaker: Professor Pablo Debenedetti\, Princeton University\n\n Title: Computational Investigation of the Phase Behavior of Supercooled Wat er\n\nAbstract: Water’s ubiquity and importance notwithstanding\, there rem ain major open questions about its physical properties\, which are anomalou s by comparison to those of most other liquids. Examples include the fact t hat the liquid\, if sufficiently cold\, expands when cooled and becomes les s viscous when compressed. Water’s oddities become more pronounced at low t emperatures\, especially in the supercooled regime\, where the liquid is me tastable with respect to crystallization. Computer simulations have played an important role in research on supercooled water\, in large part because they are not subject to the limitations that make experimental probing of d eeply metastable states so challenging. I will illustrate the application o f advanced sampling methods to the study of deeply supercooled water\, focu sing on the intriguing possibility of the existence of a metastable liquid- liquid phase transition. LAST-MODIFIED:20190409T134531Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190415T110000 DTEND;TZID=America/New_York:20190415T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190415T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Quantum optics and sensing with defects in diamond\n\nSp eaker: Lily Childress\, McGill U\n\nAbstract: Defect centres in diamond - m ost notably the nitrogen-vacancy (NV) centre - exhibit long-lived spin stat es that can be accessed by optical transitions\, similar to trapped atoms o r ions. These properties create an appealing solid-state platform for quant um information and precision sensing applications. Recently\, the optical t ransitions of NV centres at low temperature have been exploited to realize optically mediated entanglement over long distances\; however\, due to poor photon collection efficiency\, the rate is extremely low. Our group is dev eloping an open geometry micro-cavity platform that could vastly enhance th e efficiency of heralded entanglement or even enable deterministic schemes\ , and the first part of this talk will present recent progress on this proj ect. Beyond applications in quantum information\, the spin of the NV centre represents an exquisitely sensitive\, spatially-localized probe of magneti c fields\, capable of resolving static and dynamic properties of magnetic m aterials. The second half of this talk will discuss our NV-based measuremen ts of a magnetic nanostructure whose dynamics are damped or anti-damped by spin currents. By probing the NV spin transitions and relaxation rates\, we are able to observe spin transitions driven by anti-damped magnetization d ynamics and measure spin transfer cooling to ~ 150K in a room temperature d evice. LAST-MODIFIED:20190402T141837Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190409T160000 DTEND;TZID=America/New_York:20190409T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190409T160000 CREATED:20180727T143919Z DESCRIPTION:\nCarr Lecture\, to be held in 1412 John S. Toll Physics Buildi ng\n\nSpeaker: Gregory S. Boebinger\, National High Magnetic Field Laborato ry and Florida State University and the University of Florida\n\nTitle: Exp loring the Heart of Quantum Matter with Extreme Magnetic Fields\n\nAbstract : In Quantum Matter\, intrinsic electronic charges and magnetic fields cons pire in strange and weird ways to create new materials properties. High mag netic fields are uniquely positioned to probe the mysteries that remain at the heart of Quantum Matter\, where Nature creates 1/3 fractional electric charges\, “spin liquids” of fixed charges but mobile magnetic fields\, and high-temperature superconductivity in which the very existence of electrons as particles becomes suspect. LAST-MODIFIED:20190530T190803Z LOCATION:John S. Toll Physics Building\, 4150 Campus Dr\, College Park\, MD 20740\, USA SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200220T123000 DTEND;TZID=America/New_York:20200220T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200220T123000 CREATED:20200109T211506Z DESCRIPTION:Title: From atoms to dynamics (with help from statistical physi cs and AI)\nSpeaker: Pratyush Tiwary\nUniversity of Maryland | Department o f Chemistry & Biochemistry\n\nAbstract: The ability to rapidly learn from h igh-dimensional data to make reliable predictions about the future of a giv en system is crucial in many contexts. This could be a fly avoiding predato rs\, or the retina processing terabytes of data almost instantaneously to g uide complex human actions. In this work we draw parallels between such tas ks\, and the efficient sampling of complex molecules with hundreds of thous ands of atoms. Such sampling is critical for predictive computer simulation s in condensed matter physics and biophysics\, including but not limited to problems such as crystal nucleation and drug unbinding. For this we use th e Predictive Information Bottleneck (PIB) framework developed and used for the first two classes of problems\, and re-formulate it for the sampling of biomolecular structure and dynamics\, especially when plagued with rare ev ents\, and with minimum assumptions on the physics of the system [1-2]. Our method considers a given biomolecular trajectory expressed in terms of ord er parameters or basis functions\, and uses a deep neural network to learn the minimally complex yet most predictive aspects of this trajectory\, viz the PIB. This information is used to perform iterative rounds of biased sim ulations that enhance the sampling along the PIB to gradually improve its a ccuracy\, directly obtaining associated thermodynamic and kinetic informati on. We demonstrate the method on different test-pieces\, where we calculate the dissociation pathway and timescales slower than milliseconds. These in clude ligand dissociation from the protein lysozyme and and from flexible R NA.\n1. Tiwary and Berne\, PNAS 2016\n2. Wang\, Ribeiro and Tiwary\, Nature Commun. 2019 LAST-MODIFIED:20200214T142152Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200127T150000 DTEND;TZID=America/New_York:20200127T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200316T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20200127T150000 EXDATE;TZID=America/New_York:20200203T150000 EXDATE;TZID=America/New_York:20200210T150000 EXDATE;TZID=America/New_York:20200217T150000 EXDATE;TZID=America/New_York:20200224T150000 EXDATE;TZID=America/New_York:20200309T150000 DTSTAMP:20260828T094430Z UID:4nl6g6gbafic1n4icipv0jmr4o@google.com CREATED:20191218T214601Z DESCRIPTION:Ben Safdi\, University of Michigan\n\nTitle and Abstract: tk LAST-MODIFIED:20200102T142847Z LOCATION:PSC 3140 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201022T183000Z DTEND:20201022T200000Z DTSTAMP:20260828T094430Z UID:2mm80r0r1k3mu9et49i5dbt818@google.com CREATED:20201014T143649Z DESCRIPTION:Email rcawthor@umd.edu for Zoom details \;

2:30 pm - Topological Defect Networks - A Framework for Fractons
< br>Speaker: Danny Bulmash

Abstract: Fracton phases ex hibit striking behavior\, including deconfined excitations which
cannot move freely in isolation and subextensive ground state degeneracy\, which appears to
render them beyond the standard topological quantum field th eory (TQFT) paradigm for
classifying gapped quantum matter. Here\, we s how that topological defect networks---networks
of topological defects embedded in “stratified” 3+1D TQFTs---provide a unified framework for
d escribing various types of gapped fracton phases. In this picture\, the sub -dimensional
excitations characteristic of fractonic matter are a conse quence of mobility restrictions imposed
by the defect network. We conje cture that all gapped phases\, including fracton phases\, admit a
topol ogical defect network description and support this claim by explicitly prov iding such a
construction for many well-known fracton models.
Refer ence: arXiv: 2002.05166

3:00 pm - Dynamics of Renyi entropy in coupled Brownian SYK model

Speaker: Shaokai Jian

Abstract: We study the time evolution of Renyi entropy between two c oupled Brownian SYK
models starting from a product state. The Renyi ent ropy grows linearly and then saturates to the
coarse grained entropy. T his Page curve is obtained by two different methods\, the saddle point
analysis and the operator dynamics. As a Brownian circuit\, the Page curve is governed by
operator dynamics\, which we derive in the form of the m aster equation. Behind this complicated
master equation\, a more physic al explanation is revealed with the help of saddle point method:
the re plica-diagonal and replica-wormhole saddles are responsible for the linear growth and the
saturation of Renyi entropy\, respectively.

3 :30 pm - Fermi surface topology and quasiparticle properties in an anis otropic
electron gas

Speaker: Seongjin Ahn

Ab stract: We have carried out a comprehensive investigation on the renorm alized Fermi
surface and the quasiparticle properties in a two-dimensio nal electron gas in the presence of
mass anisotropy. We first show that the interacting Fermi surface deviates from an ellipse\, but
not in an arbitrary way: The interacting Fermi surface has only two qualitatively di stinct shapes\,
and its deviation from an ellipse is quantitatively rat her small except for very low electron
density\, providing justificatio n for the widely used elliptical Fermi surface approximation. We
then i nvestigate the quasiparticle properties by calculating the self-energy\, th e spectral function\,
the scattering rate\, and the effective mass. We find novel anisotropic features of quasiparticle
properties that are no t captured by the commonly used isotropic approximation where the
aniso tropic effective mass is replaced by the isotropic averaged density-of-stat e mass.
Reference: arXiv: 2002.12532

4:00 pm - Discussio n LAST-MODIFIED:20201014T143649Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY: CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200407T160000 DTEND;TZID=America/New_York:20200407T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200407T160000 CREATED:20190530T191015Z DESCRIPTION:
Jedediah Pixley\, Rutgers University

Hosted by Alicia Kollár LAST-MODIFIED:20200311T162227Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED-Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190419T160000Z DTEND:20190419T164000Z DTSTAMP:20260828T094430Z UID:6r8ed0hmn29uadis7r7nu31bea@google.com CREATED:20190411T004729Z DESCRIPTION:Title: Characterizing Correlated Dephasing Noise in Many-Qubit Systems\, Using Compressed Sensing\n\nSpeaker: Alireza Seif\, JQI\n\nAbstra ct: When one develops quantum information processors with larger numbers of qubits\, correlated dephasing errors and crosstalk can have an important e ffect on the overall accuracy of the device. Detecting these correlations c an require a large number of measurements. We consider the special case whe re the correlations are sparse\, i.e.\, for a system of n qubits\, there ar e k pairs of qubits that are correlated\, where k << n(n-1)/2. We propose a method that uses compressed sensing and entangled measurements to find the se correlated pairs of qubits more efficiently\, using poly(k log n) measur ement settings.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190411T004747Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T160000Z DTEND:20181114T171500Z DTSTAMP:20260828T094430Z UID:66a38hejn7v08449eghrhhq4ae@google.com CREATED:20180828T232659Z DESCRIPTION:
Title: Transport in Strongly Correlated Bad Metals

Speaker: Aharon Kapitulnik (Stanford)

Abstract: The Boltzmann-Drude picture of electronic transport ceases to be valid when the electron mean-free-path becomes
shorter than the Fermi wavelength. The Mott-Ioffe-Regel limit is defined where the two lengths are equal\, and beyond it metallic transport becomes incoherent. Most experimental works h ave focused on the electronic transport\, with the host crystal providing a phonon background. Here we report thermal diffusivity measurements that\, together with the resistivity\, give a full account of transport of charge and entropy. Utilizing a high-resolution photothermal apparatus\, we study the thermal diffusivity of several electron-doped cuprate systems in the re gime where the quasiparticle picture fails for both electron and phonons. T he inverse diffusivity at high temperature can be fitted with a temperature -linear form\, where the slope term is set by a unique velocity and a Planc kian relaxation time ~h/kBT\, The constant term represents a quantum-diffus ion constant separating incoherent transport from a regime with well-define d quasiparticles.

Host: Brian Swingle

Condensed Matter Theory Center website:
http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20181108T134911Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200814T190000Z DTEND:20200814T200000Z DTSTAMP:20260828T094430Z UID:34rjdbcdsqbb2s1h2qalo3cvg3@google.com CREATED:20200806T020736Z DESCRIPTION:
Alexey Gorshkov
Title: Dynamics of quantum systems with long-range interactions

Abstract: Atomic\, molecular\, and optical s ystems often exhibit long-range interactions\, which decay with distance r as a power law 1/r^alpha. In this talk\, we will discuss bounds on how quic kly quantum information can propagate in such systems. We will then discuss applications of these bounds to numerous phenomena including classical and quantum simulation of quantum systems\, prethermal phases in Floquet syste ms\, entanglement area laws\, sampling complexity\, and scrambling.


The following link explains how to access virtual seminar:
https:/ /sites.google.com/stanford.edu/virtual-amo-seminar/schedule LAST-MODIFIED:20200806T020736Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Virtual AMO Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201026T170000Z DTEND:20201026T181500Z DTSTAMP:20260828T094430Z UID:188ub40ndh5lqr6pl37jcrv2qd@google.com CREATED:20201019T183038Z DESCRIPTION:

Speaker: \; Prof. Peter Shawhan of UM CP’s Experimental Gravity Group

Title: "LIGO's Or dinary and Exceptional Gravitational-Wave Events".

Prof. Shawhan has been a UMD faculty member since 2006\, and is also a Fe llow of the Joint Space-Science Institute. \; He has held numerous lead ership positions within the LIGO Scientific Collaboration (LSC). \;&nbs p\;Prof. Shawhan currently serves as Observational Science Coordinator for LIGO and is a member of the LSC Management Team. \; He is also doing re search in superconducting gravity gradiometer sensors and in gamma-ray astr ophysics.

This is a guest lecture in Bei-Lok Hu's Phys 6 75/475 so it will have more pedagogical flavor\, from LIGO to data analysis to recent observed astrophysical events. \; ALL ARE WELCOME!

Link to my regular lectures: \; Go to ELMS\, Zoom\, and cl ick on link below (for lectures only): \;

UR L: \;https://umd.zoom.us/j/97293258123?pwd=Sz NuOVNvaUtqT2VpUWx1OVh4QTJtUT09

Or go to umd.zoom.us and type in the Meetin g ID 972 9325 8123 Passcode 3y913v \;

LAST-MODIFIED:20201019T193514Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181107T183000Z DTEND:20181107T200000Z DTSTAMP:20260828T094430Z UID:6aav4clc20t80ugthlrdi6l4sq@google.com CREATED:20180925T195939Z DESCRIPTION:\nTitle: Timing BSM signals at the LHC\n\nSpeaker Name: Zhen Li u\, University of Maryland\n\nAbstract : In this talk\, I will present firs tly an overview of the theory and experimental coverage of the long-lived p articles (LLPs) at the LHC. I will then discuss why we think the LHC covera ge on LLPs has a large room for improvement and present how to realize such excellent physics potential through using precision timing information. In comparison with the light Standard Model particles\, the decay products of massive LLPs arrive at detectors with time delay around nanosecond scale. We propose new strategies to take advantage of this time delay by using ini tial state radiation jets to timestamp the collision event and subsequently require at least one LLP to decay within the detector volume. This search strategy can be useful for a broad range of models. Our approach increases the sensitivity to the lifetime of the LLP by two orders of magnitude or mo re and particularly exhibits a better behavior with a linear dependence on the lifetime in the long lifetime region compared to traditional LLP search es at colliders. The timing information significantly reduces the Standard Model background and provides a powerful new dimension for LLP searches.\n\ nSeminar will be preceded by lunch at 12:00 pm on 3rd floor PSC. The talk i s from 1:30 to 3:00 pm. Please note location for talk is on the second floo r. Times are tentative. LAST-MODIFIED:20181018T185538Z LOCATION:PSC room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMD/JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181101T123000 DTEND;TZID=America/New_York:20181101T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181101T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Neuronal coding in the insect olfactory system\nSpeaker: Prof. Quentin Gaudry\nUniversity of Maryland Department of Biology\n\nAbst ract: The world is full of volatile chemical cues that animals must deciphe r to detect the presence of prey\, predators\, and even potential mates. Th e olfactory system is burdened with the task of interpreting a near infinit e amount of odors given a limited repository of chemoreceptors. Studies emp hasizing invertebrates have provided tremendous insight into the basic mech anisms of olfaction\, and the highly analogous organization of invertebrat e and mammal olfactory systems suggests that such studies can shed light up on how our own sense of smell functions. In this seminar\, I will discuss d ata from Drosophila melanogaster and locusts revealing how olfactory inform ation is transformed at subsequent stages of processing. Finally\, I will d iscuss data from my own laboratory showing how neuromodulatory neurons that alter the sensory processing interact with the olfactory system. LAST-MODIFIED:20181024T185628Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190411T180000Z DTEND:20190411T193000Z DTSTAMP:20260828T094430Z UID:2bogc3ugv0a27q9mpj0a523tfa@google.com CREATED:20190312T134952Z DESCRIPTION:Title: Orbital-selective Kondo-lattice and enigmatic f-quasipar ticles emerging from inside the antiferromagnetic phase of a heavy fermion\ nSpeaker: Pegor Aynajian\, Binghamton University\nAbstract:\nNovel electron ic phenomena frequently form in heavy fermions as a consequence\nof the mut ual nature of localization and itineracy of f-electrons. On the\nmagnetical ly ordered side of the heavy fermion phase diagram\, f-moments are\nexpecte d to be localized and decoupled from the Fermi surface. It remains\nambiguo us whether a Kondo-lattice can develop inside the magnetically ordered\npha se. Using spectroscopic imaging with the scanning tunneling microscope\,\nc omplemented by neutron scattering\, x-ray absorption spectroscopy\, and\ndy namical mean-field theory\, we probe the electronic states in the\nantiferr omagnetic USb 2 as a function of temperature. We visualize an\nantiferromag netic gap at high temperatures (T < T N ~ 200 K) within which Kondo-\nhybri dization gradually develops below T coh ~ 80 K. Our dynamical mean-field\nt heory calculations indicate the antiferromagnetism and Kondo-lattice to res ide\npredominantly on different f-orbitals\, promoting orbital-selectivity as a new\nconception into how these two phenomena coexist in heavy fermions . Finally\, at\nT* = 45 K we discover a novel 1 st order-like electronic tr ansition through the\nabrupt emergence of non-trivial 5f quasiparticles tha t may share some resemblance\nto the “hidden order” phase of URu 2 Si 2 .\n Host: N. Butch\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20190408T204350Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Pegor Aynajian\, Binghamton University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181205T160000Z DTEND:20181205T170000Z DTSTAMP:20260828T094430Z UID:350ouevkeobtql210jjfash079@google.com CREATED:20180905T140108Z DESCRIPTION:Speaker: Professor Nicholas E. Manicke\, Indiana University- Purdue University

Title: New Mass Spectrometry Approaches for Detection of Synthetic Drugs\, Chemical and Biological Warfare Agents\, an d Clinical Protein Markers LAST-MODIFIED:20181127T185307Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200824T190000Z DTEND:20200824T200000Z DTSTAMP:20260828T094430Z UID:78t0a9s44rnj2hop6ommhtqen1@google.com CREATED:20200807T191331Z DESCRIPTION:Seminar will be conducted via zoom.

Speaker: Michael Gel ler\, Tel Aviv University

Title: Crunching Dilaton\, Hidden Naturaln ess

Abstract: We introduce a new approach to the Higgs naturalness p roblem\, where the value of the Higgs mass is tied to cosmic stability and the possibility of a large observable Universe. The Higgs mixes with the di laton of a CFT sector whose true ground state has a large negative vacuum e nergy. If the Higgs VEV is non-zero and below O(TeV) the CFT also admits a second metastable vacuum\, where the expansion history of the Universe is c onventional. As a result\, only Hubble patches with unnaturally small value s of the Higgs mass support inflation and post-inflationary expansion\, whi le all other patches rapidly crunch. The elementary Higgs VEV driving the d ilaton potential is the essence of our new solution to the hierarchy proble m. The main experimental prediction is a light dilaton field in the 0.1-10 GeV range that mixes with the Higgs. Part of the viable parameter space has already been probed by measurements of rare B-meson decays\, and the rest will be fully explored by future colliders and experiments searching for li ght\, weakly-coupled particles.

For the zoom link to this talk pleas e contact mknouse@umd.edu LAST-MODIFIED:20200820T213505Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200303T160000 DTEND;TZID=America/New_York:20200303T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200303T160000 CREATED:20190530T191015Z LAST-MODIFIED:20200225T151326Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181003T173000Z DTEND:20181003T190000Z DTSTAMP:20260828T094430Z UID:33ijdiovs66btn1371uvjhtrhq@google.com CREATED:20180928T161826Z DESCRIPTION:Speaker Name: Leo Piilonen\nSpeaker Institution : Virginia Tech \nI describe the second-generation B-factory detector\, Belle II\, and acce lerator\, SuperKEKB\, that have started operating at the KEK laboratory in Japan. I will present the status of the experiment\, including early physic s results from the Phase 2 run in 2018\, and prospects for the Phase 3 run in 2019.\n\n\nYour Name: Sally Megonigal\nYour E-Mail: smegonig@umd.edu\nRe search Group/Institution : High Energy LAST-MODIFIED:20180928T161951Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP seminar: The Belle II Experiment at KEK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200127T110000 DTEND;TZID=America/New_York:20200127T120000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com RECURRENCE-ID;TZID=America/New_York:20200127T110000 CREATED:20191125T175528Z DESCRIPTION:Title: \;Engineering coherent defects in diamond \;< /b>

Speaker: \;Nathalie P. de Leon \;\, Princeton Uni versity

Abstract: \;

Engineering coherent systems is a cent ral goal of quantum science and quantum information processing. Point defec ts in diamond known as color centers are a promising physical platform. As atom-like systems\, they can exhibit excellent spin coherence and can be ma nipulated with light. As solid-state defects\, they can be produced at high densities and incorporated into scalable devices. Diamond is a uniquely ex cellent host: it has a large band gap\, can be synthesized with sub-ppb imp urity concentrations\, and can be isotopically purified to eliminate magnet ic noise from nuclear spins. Specifically\, the nitrogen vacancy (NV) cente r has been used to demonstrate basic building blocks of quantum networks an d quantum computers\, and has been demonstrated to be a highly sensitive\, non-invasive magnetic probe capable of resolving the magnetic field of a si ngle electron spin with nanometer spatial resolution. However\, realizing t he full potential of these systems requires the ability to both understand and manipulate diamond as a material. I will present two recent results tha t demonstrate how carefully tailoring the diamond host can open new opportu nities in quantum science.

First\, currently-known color centers eith er exhibit long spin coherence times or efficient\, coherent optical transi tions\, but not both. We have developed new methods to control the diamond Fermi level in order to stabilize a new color center\, the neutral charge s tate of the silicon vacancy (SiV) center [1\,2]. This center exhibits both the excellent optical properties of the negatively charged SiV center and t he long spin coherence times of the NV center\, making it a promising candi date for applications as a single atom quantum memory for long distance qua ntum communication. Our approach for systematically engineering new color c enters in diamond is generalizable to a broader search for quantum defects in many material systems. I will also describe our recent efforts to develo p a materials discovery pipeline for rapid screening of new host materials and new defects\, including nuclear-spin-free host materials for Er3+\, a p romising system for quantum networks [4].

Second\, color centers plac ed close to the diamond surface can have strong interactions with molecules and materials external to the diamond\, which makes them promising for nan oscale sensing and imaging. However\, uncontrolled surface termination and contamination can degrade the color center properties and give rise to nois e that obscures the signal of interest. I will describe our recent efforts to stabilize shallow NV centers within 5 nm of the surface using new surfac e processing and termination techniques [3]. Specifically\, we are able to demonstrate reversible and reproducible control over the top layer of atoms . These highly coherent\, shallow NV centers will provide a platform for se nsing and imaging down to the scale of single atoms.

References

  • B. C. Rose\, D. Huang\, Z. Zhang\, P. Stevenson\, A. M. Tyryshkin\ , S. Sangtawesin\, S. Srinivasan\, L. Loudin\, M. L. Markham\, A. M. Edmond s\, D. J. Twitchen\, S. A. Lyon\, N. P. de Leon\, “Observation of an enviro nmentally insensitive solid state spin defect in diamond\,” Science 361\, 6 0-63 (2018).​

  • B. C. Rose\, G. Thiering\, A. M. Tyryshkin\, A . M. Edmonds\, M. L. Markham\, A. Gali\, S. A. Lyon\, N. P. de Leon\, “Stro ngly Anisotropic Spin Relaxation in the Neutral Silicon Vacancy Center in D iamond\,” Phys. Rev. B 98\, 235140 (2018).

  • S. Sangtawesin\, B. L. Dwyer\, S. Srinivasan\, J. J. Allred\, L. V. H. Rodgers\, K. De Greve \, A. Stacey\, N. Dontschuk\, K. M. O'Donnell\, D. Hu\, D. A. Evans\, C. Ja ye\, D. A. Fischer\, M. L. Markham\, D. J. Twitchen\, H. Park\, M. D. Lukin \, N. P. de Leon\, "Origins of diamond surface noise probed by correlating single spin measurements with surface spectroscopy\," Physical Review X 9\, 031052 (2019).​​

  • C. M. Phenicie\, P. Stevenson\, S. Welinsk i\, B. C. Rose\, A. T. Asfaw\, R. J. Cava\, S. A. Lyon\, N. P. de Leon\, J. D. Thompson\, “Narrow optical linewidths in erbium implanted in TiO2\,” ar Xiv:1909.06304\, accepted to Nano Letters.


    • Host: Edo Waks< /b> LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181126T153000Z DTEND:20181126T163000Z DTSTAMP:20260828T094430Z UID:4v10ifpcieua8rnpfq54g6oiiv@google.com CREATED:20181120T135633Z DESCRIPTION:Speaker: David J. Wales\, Cambridge University\, Department of Chemistry

    Title: Energy Landscapes and Machine Lear ning: From Molecules to Medicine

    Abstract: This talk will introduce the energy landscapes perspective\, and illustrate how it can be used in new ways to address the landscapes generated by neural networks in machine learning applications. Here\, defining thermodynamic and kinetic analogues for machine learning landscapes provides insight ranging from mo lecular geometry optimization to patient outcomes. Prediction of structure \, dynamics\, and thermodynamics from molecular landscapes has been used in a wide variety of contexts that are relevant to human health. Examples wi ll be presented for atomistic and coarse-grained models of virus capsids an d associated proteins associated with infection\, along with protein foldin g and misfolding\, and recent results for structural transformations and mu tations in nucleic acids. LAST-MODIFIED:20181120T135646Z LOCATION:Portrait Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Division Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181211T160000Z DTEND:20181211T171500Z DTSTAMP:20260828T094430Z UID:31u426uu9g6japvvlbc6rfrs9c@google.com CREATED:20181101T162106Z DESCRIPTION:
    Title: Pressure-induced superconductivity in twisted bil ayer graphene

    Speaker: Cory Dean (Columbia)

    Abstract: Twi sted bilayer graphene (tBLG) with rotational mismatch of ~1.1°\, referred t o as the “magic angle\,” has emerged as an exciting new platform to host st rongly correlated electronic states due to its very flat low-energy bands [ 1-2]. The electronic bandwidth – and consequentially the strength of the c orrelated states – is determined by an interplay between the separation of the Dirac cones of the two graphene layers in momentum space (set by the tw ist angle) and the strength of the interlayer electronic coupling (set by t he layer spacing). For fixed interlayer coupling\, the twist angle 1.1° cor responds to the angle at which the bandwidth becomes a minimum and correlat ions are therefore expected to be strongest. In my talk I will present rec ent experimental efforts in which we find that instead of varying the twist angle\, we can modify the band structure at fixed angle by using hydrostat ic pressure to tune the interlayer coupling. For angles larger than the nat ive magic angle\, we show that under applied pressure we can induce robus t superconductivity for both hole and electron-type carriers\, as well as i nsulating states at half- and three-quarters band filling. The ability to r ecover the flat band condition at arbitrary twist angle provides a possible path to both understanding the origin of the superconducting phase and pot entially increasing its energy scale. The role of disorder in these system s and its impact on the observed correlated phases will also be discussed.

    Host: Tom Iadecola

    Condensed Matter Theory Center website:h ttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20181205T194941Z LOCATION:CMTC Conference Room (2205 Toll Physics Bldg) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR -- Rescheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201019T190000Z DTEND:20201019T200000Z DTSTAMP:20260828T094430Z UID:6ap5s34uj75gp6d7hnp70bpn6n@google.com CREATED:20201015T181554Z DESCRIPTION:Seminar to be conducted via zoom.\n\nSpeaker: Anson Hook\, UMD\ n\nTitle : Relaxing the Higgs mass\n\nAbstract : We present a new approach to the Hierarchy problem utilizing self organized criticality. The Higgs m ass is generically large\, but when expanded around the minimum of the pote ntial\, the Higgs mass is small. This approach is analogous to models of t he dilaton where the quartic is large at tree level\, but small when expand ed around the minimum of the potential. The model presented solves the lit tle Hierarchy problem and is testable at colliders\, in stellar environment s and at fifth force experiments.\n\nFor zoom link email mknouse@umd.edu LAST-MODIFIED:20201015T181554Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190403T150000Z DTEND:20190403T160000Z DTSTAMP:20260828T094430Z UID:24so7i5h5oq1v4g6dh5q85s613@google.com CREATED:20190328T130256Z LAST-MODIFIED:20190328T130340Z LOCATION:Marker Room/Chem 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181210T200000Z DTEND:20181210T213000Z DTSTAMP:20260828T094430Z UID:6bbqr69fh0o212ve893dc3qc82@google.com CREATED:20181106T162527Z DESCRIPTION:
    Title: A Test of Dark Matter vs IR Modifications to Gravity from Local Milky Way Observables

    Speaker: Oren Slone\, Princeton Un iversity

    Abstract: Many aspects of the well known observation that r otation curves become flat in the outer regions of rotating galaxies are ye t to be explained\; a statement which remains true even within the context of Dark Matter (DM) theories. These aspects include observational evidence such as the Baryonic Tully Fisher (BTF) relation and the Radial Acceleratio n Relation (RAR)\, as well as clues which point to correlations between bar yons and observed acceleration on a galaxy by galaxy basis. A number of alt ernatives to DM\, which involve IR modifications to the theory of General R elativity (GR) and attempt to explain these observations\, have been propos ed over the last decades. These theories often suffer from lack of a consis tent UV counterpart to the IR theory\, as well as difficulties in describin g observations at scales larger than galaxies. However\, on galactic scales \, IR modifications to gravity remain a viable option and should be tested against observations. Importantly\, if such a theory describes galactic dyn amics\, it should be consistent with all local Milky Way (MW) observables. These include local measurements of the rotation curve\, the local stellar and gas surface density and the vertical acceleration field around the Sola r position\, as well as constraints on the baryonic density profile. The cu rrent study tests precisely this requirement on a general class of IR modif ications to gravity\, focusing on theories which predict isotropic amplific ations of gravity\, i.e. do not distinguish between projections of the acce leration vector onto any coordinate. Results are compared to the same test for a DM theory. The main finding of this study is that an isotropic IR mod ification to gravity is in tension with observations of the MW's scale radi us and bulge mass and that a DM theory exhibits a better fit to the data. T hus\, the theory which governs galactic dynamics is likely not isotropic in its nature.
    LAST-MODIFIED:20181203T162535Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191015T200000Z DTEND:20191015T210000Z DTSTAMP:20260828T094430Z UID:0mb3ns8tsg50r2c0u34d0vtpjp@google.com CREATED:20190820T131838Z DESCRIPTION:Speaker: Jenann Ismael\, Columbia University

    Title: Info rmation\, Time\, and Life

    Abstract: The differences between past and future frame every aspect of our experience of the world. It is a remarkab le fact that research that began in the mid-nineteenth century and was orig inally focused on trying to derive the phenomenological asymmetries embodie d in the second law of thermodynamics from the time-symmetric laws of class ical mechanics turned into a very general account of the sources of tempora l asymmetry in our world. So a conversation that started by being about why (for example) gas will disperse to fill an open container\, turned into a conversation about why we remember the past but not the future\, why time s eems to flow from past to future\, and why we can affect the future but not the past.


    There is much that remains to be understood\, but we can assemble the pieces that we have into a picture that has intelligible c ontours and gives us deep insight not only into the nature of time\, but th e asymmetries that structure living processes\, and our own place in the un iverse. I'll sketch the elements of this picture in broad strokes\, highlig hting the role of information.


    3 - 3:50 pm: Reception in the James A. Yorke Rotunda\, William E. Kirwan Hall
    4 - 5:00 pm: Lect ure in 1412 John S. Physics Building     LAST-MODIFIED:20190918T144943Z LOCATION:1412 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Shih-I Pai Lecture/Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200115T150000Z DTEND:20200115T160000Z DTSTAMP:20260828T094430Z UID:29aj3dvqq32shdaa1236kg4bu5@google.com CREATED:20200108T154825Z DESCRIPTION:Title : Asymmetric diffusion of magnetic field lines\nSpeaker N ame: Andrey Beresenyak\nSpeaker Institution : Naval Research Laboratory\n\n Abstract : Particles interact via fields in a collisionless plasma. This in teraction is a\nkey to understand the transport\, for example\, in the cont ext of solar wind - how\nparticles from an active region on the Sun spread around its initial magnetic\nflux tube. Perhaps even more importantly\, we need to understand how plasmas end\nup in non-equilibrium states and how fr ee energy from large scales drives this\nprocess. I looked at field line di ffusion\, which is the main contributor to\nperpendicular transport in coll isionless\, turbulent magnetized plasmas.\nAmazingly\, this diffusion\, whi ch is a purely geometric property of magnetic field\nlines\, does not have to be symmetric\, e.g. particles following the field line\nalong the direct ion of the magnetic field can have a different perpendicular\ndiffusion coe fficient than particles propagating in the opposite direction. This\ncan cr eate free energy in particles entirely due to this peculiar geometry of\nfi eld lines\, for example\, perpendicular particle gradients in such a system will\nresult in particle streaming. Although it seems like magic\, this do es not break\nthe second law of thermodynamics\, because it relies on time- irreversibility of\nturbulence\, which\, in turn\, follows from the fact th at turbulence produces\nentropy. In an artificial system having time-symmet ric random fields\, such an\neffect is absent. MHD and PIC simulations of i mbalanced turbulence show\nasymmetric diffusion. It should be important in the solar wind\, which is\nturbulent\, imbalanced and has high perpendicula r gradients in particles.\n \n swisdak@umd.edu LAST-MODIFIED:20200114T165944Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181012T180000Z DTEND:20181012T190000Z DTSTAMP:20260828T094430Z UID:0fd3v7g6si2fh087haomq9eijh@google.com CREATED:20181002T113521Z DESCRIPTION:\n\nTitle: Entanglement structure of current-driven diffusive f ermion systems \n\nMichael Gullans\, Princeton University\n\nAbstract: App lying a chemical potential bias to a conductor drives the system out of equ ilibrium into a current carrying non-equilibrium state. This current flow is associated with entropy production in the leads\, but it remains poorly understood under what conditions the system is driven to local equilibrium by this process. We investigate this problem using two toy models for cohe rent quantum transport of diffusive fermions: Anderson models in the condu cting phase and a class of random quantum circuits acting on a chain of qub its\, which exactly maps to an interacting fermion problem. Under certain c onditions\, we find that the long-time states in both models exhibit volume -law mutual information and entanglement\, in striking violation of local e quilibrium. Extending this analysis to Anderson metal-insulator transition s\, we find that the volume-law entanglement scaling persists at the critic al point up to mobility edge effects. This work points towards a broad cla ss of examples of physical systems where volume-law entanglement can be sus tained\, and potentially harnessed\, despite strong coupling of the system to its surrounding environment. LAST-MODIFIED:20181004T152147Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200221T203000Z DTEND:20200221T213000Z DTSTAMP:20260828T094430Z UID:4tosnog5eg59b1rbahvfil1f4t@google.com CREATED:20200217T211916Z DESCRIPTION:

    Booz Allen Hamilton Distinguished Colloquium Seri es

    Qua ntum Diamond Sensing: Advances and Applications to Integrated Circuit Activ ity Monitoring

    Edlyn V. Levine\, Ph.D.
    Lead Physici st\, The MITRE Corporation
    Research Associate\, Department of Physics\, Harvard University


    Abstract: Dr. Levine will discuss recen t advances in state-of-the-art quantum diamond sensing to measure and chara cterize complicated spatial and temporal variations of microscopic signals (magnetic fields\, etc.) from diverse targets of technological interest. Th e electron spin states of nitrogen vacancy (NV) defect centers in diamond a re exquisitely sensitive to external magnetic fields\, as well as to electr ic fields\, temperature\, and strain fields. Optical initialization and rea dout of NV spins allows for easy interrogation of the magnetic field local to the NV center. \; \;As such\, NV centers are ideal magnetometers for measuring microscopic magnetic field distributions. An ensemble of NVs in a monolithic diamond chip is used to achieve micron-resolution of magne tic fields over a field-of-view of several millimeters with high sensitivit y. She will present recent results demonstrating full-vector magnetic field imaging with simultaneous wide field-of-view and micron-scale resolution o f static current in integrated circuits (ICs) using a quantum diamond micro scope (QDM). Magnetic fields pass largely undisturbed through standard mate rials used by the semiconductor industry and afford a powerful means to fin gerprint IC activity for security and failure analysis applications. The hi gh-resolution QDM images can determine pre-programmed IC active states of i ntact and decapsulated ICs with high fidelity utilizing machine-learning cl assification methods.

    Bio: Edlyn Levine\, PhD ’16\, applied physics\, is a Lead Physicist at the MITRE Corporation. Her work at MITRE focuses on tackling advanced technical challenges and expanding scientific frontiers in the interest of National Defense. She also leads MITRE's Academic Engage ment Team\, focusing on building research and recruitment relationships wit h Boston-area universities. She holds these positions jointly with a Resear ch Associateship in the Department of Physics at Harvard University. Dr. Le vine has been awarded for her scientific work with nationally competitive f ellowships\, the NSF Graduate Research Fellowship and the National Defense Science and Engineering Graduate Fellowship. She served as the Coordinating Fellow for Dudley House after three years of service as the Dudley Outings Fellow. Her efforts as a Fellow enabled her to contribute to\, and enrich\ , the graduate community at Harvard. She received the Hanson Award for Spec ial Service to Graduate Students in recognition of these contributions. Dr. Levine was also president of the GSAS Science Policy Group. She is investe d in empowering graduate students to explore their opportunities and has ad vised students individually\, and via workshops\, on how to succeed in grad uate school and in the job market.

    Host: Professor Ron Walsworth\, The University of Maryland

    LAST-MODIFIED:20200217T211936Z LOCATION:Gannon Auditorium\, Brendan Iribe Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Diamond Sensing: Advances and Applications to Integrated Ci rcuit Activity Monitoring TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201002T170000Z DTEND:20201002T180000Z DTSTAMP:20260828T094430Z UID:17tk1g4a9mtivlc0al6teibc3n@google.com CREATED:20200923T154109Z DESCRIPTION:Speaker: Arthur (Von) Cresce\, Ph.D.\, Materials Scientist\, U. S. Army Research Laboratory

    Title: The Materials Evaluation of the A queous Lithium Ion Battery

    Abstract: Lithium ion batteries have gone through many permutations since their inception in the early 1980s as an e nergy storage alternative competitive with nickel metal hydride and lead ac id batteries. From 1994 until 2015\, lithium ion batteries with water elect rolytes were a research area that produced a few interesting papers but exa ctly zero industry-ready battery technologies. In 2015\, a collaboration be tween ARL and the University of Maryland produced an aqueous electrolyte ca lled the "water-in-salt" electrolyte (WiSE) that used high concentrations o f a lithium imide salt to passivate the battery anode and increase the elec trochemical stability window of water from 1.SV to effectively 3.0V. Furthe r advancement resulted in a 4.2V aqueous lithium ion battery- making aqueou s lithium ion batteries able to deliver up to 400 Wh/kg and 900 Wh/L at the pack level using advanced electrode materials. Such high gravimetric and v olumetric energy density makes aqueous lithium ion batteries a promising po tential source of energy storage for electric vehicles\, homes\, and device s. Aqueous lithium ion batteries do not burn and do not fail violently even if violently compromised at high states of charge.

    The combination of ve ry high pack energy density and materials-level safety gives aqueous lithiu m ion batteries a significant potential advantage in the commercial marketp lace. This talk will highlight the growth of aqueous lithium ion batteries as a research concept and their transition to relevance using materials and strategies developed through ARL collaboration with the University of Mary land and outside industrial partners.

    Bio:

    Dr. Arthur V. Cresce is a materials scientist and electrochemist in the Energy Storage Branch a t ARL and has been a civilian employee since 2012. His objective is to deve lop lithium ion batteries that use water­ based electrolytes\, as well as t he fundamental study of the behavior of electrolytes\, their interfacial fo rmation\, and factors used to select superior electrolytes for different ap plications. He is also responsible for re-designing electrodes meant to be used with solid gel electrolytes and flexible electrode materials that will be used to construct fully flexible lithium ion batteries. He has also stu died the fundamental properties of aqueous electrolytes\, such as their sal vation\, the relationship between free water\, anion reduction\, and electr olyte sta bility. He graduated from the University of Maryland College Park with a Ph.D. in Materials Science from the laboratory of Peter Kofinas in 2007 and joined ARL as a postdoctoral fellow in 2009 after a postdoctoral s tint at the University of Maryland in Baltimore School of Pharmacy. His dis sertation detailed the use of monodisperse amphiphilic block copolymers as a selection and sensing tool for microfluidic and MEMs devices.

    LAST-MODIFIED:20200923T154109Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200402T153000 DTEND;TZID=America/New_York:20200402T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200501T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:5eo89lqa196p5fr8ka3vjbavre_R20200402T193000@google.com CREATED:20200213T172330Z DESCRIPTION:
    Recurring ZoomMeeting:
    https://umd.zoom.us/j/614678017
    Me eting ID: 614 678 017



    For upcoming talks in this series: \; http://www-math.umd.edu/gcal_rss.p hp?seminar_key=RGP&\;year=2020&\;html


    https://www-math.umd.edu/research/seminar s/current-rits-and-student-seminars.html
     LAST-MODIFIED:20200331T153429Z LOCATION:Via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201106T140000 DTEND;TZID=America/New_York:20201106T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201106T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;Zoom Link
    Speaker: Nobuo Sato\, Jefferson Lab

    Title: A new paradigm for QCD global analysis

    Abstract:
    Several decades of high-energy scat tering experiments have given us intriguing\, though limited\, glimpses int o the inner structure of protons and neutrons. With the 12 GeV nuclear phys ics program at Jefferson Lab underway\, and plans being made for a future E lectron-Ion Collider facility\, we are at the threshold of imaging the nucl eons three-dimensional structure through its quark and gluon quantum probab ility distributions. Extracting the quantum distributions from the experime ntal data is very challenging\, however\, because of the inverse problem: t he measured cross sections are given by convolutions of the quantum probabi lity distributions with process-dependent hard coefficients that are pertur batively calculable from Quantum Chromodynamics. While most previous analys es have been based on the maximum likelihood approach\, it has become evide nt that Bayesian likelihood methods are needed\, using Monte Carlo sampling techniques to thoroughly explore the parameter space associated with the q uantum probability distributions. I this talk I will review recent developm ents in tackling the inverse problem for extracting quantum distributions f rom experimental measurements. LAST-MODIFIED:20201029T155533Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161212T110000 DTEND;TZID=America/New_York:20161212T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161212T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Robert Boyd\, U. Rochester/U. Ottawa\nTitle: Quantum I maging\n\nAbstract:\n\nIn this talk\, I present an overview of three topics of significance to the field of quantum sensing. I first review the field of quantum imaging. This field strives to develop methods for making image s sharper or clearer through the use of quantum aspects of light. Specific topics to be treated include two-color ghost imaging\, interaction-free gho st imaging\, imaging with photon-added states\, and imaging with “undetecte d photons.” I will then turn to a brief discussion of structured light fiel ds and their potential for the dense coding of information onto individual photons. I also describe a quantum communications system that can transmit more than one bit of information per photon. Lastly\, I turn to a discussio n of materials and structures for quantum sensing. Specific topics include the large nonlinear response available from epsilon-near-zero materials\, s ingle-photon sources\, and chip-scale devices for quantum sensing. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191115T180000Z DTEND:20191115T190000Z DTSTAMP:20260828T094430Z UID:0jv3ajpmmlfff8p5vhsdes93c5@google.com CREATED:20190905T134339Z DESCRIPTION:Speaker: Patrick McGrath\, Deputy Director for Technology\, ARP A-E\n\nTitle: How Today's Energy Transition Defines Tomorrow's R&D Needs\n\ nAbstract: Wind and solar generation technologies have advanced to the poin t that\, today\, they are the lowest-cost new-build generation technologies in the U.S. (as measured by Levelized Cost of Electricity). This is a sign ificant milestone in the nation’s transition to a low-carbon electric syste m\, but it is not the end of the road. While the grid will continue to inco rporate greater levels renewable generation and expand the deployment of st orage technologies\, recent analyses suggest that other “firm low-carbon” g eneration technologies are required to reach deep decarbonization goals on the grid. Building a system where the lowest-cost options are variable in nature will impose a new set of requirements and constraints that are very different from the grid’s historical design and operation rules. This\, in turn\, demands that we revisit the design conventions for full range of gen eration technologies that can enable a carbon-free electric system\, includ ing nuclear\, CCS\, and geothermal. This talk will provide an overview of a number of ARPA-E’S technology development efforts that seek to incorporate greater grid flexibility and modularity to enable the low-carbon system of the future. LAST-MODIFIED:20191104T140550Z LOCATION:1107 & 111 KEB (Kay Boardrooms) *MEl2 Joint Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - *MEl2 Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201117T160000Z DTEND:20201117T170000Z DTSTAMP:20260828T094430Z UID:3aigkl85712l5j4nmu4j8s964b@google.com CREATED:20200915T182006Z DESCRIPTION:
    Speaker: Cory Dean \;(Columbia University)
    < dd>
    Title: \;Correlated states in graphene quantum h all bilayers and trilayers

    Abstract: \;Quan tum Hall bilayers\, in which two parallel quantum wells are separated by an insulating tunnel barrier\, and subjected to a transverse magnetic field\, provide a rich platform to study interaction-driven correlated phenomenon. The transverse magnetic field transforms the energy spectrum of the 2D ele ctrons into a series of discrete Landau levels\, where kinetic energy is qu enched and Coulomb interactions become the dominant energy scale. In additi on\, coupling between the layers can be precisely tuned through variations in the effective interlayer separation. This provides unique experimental a ccess to correlated ground states with tunable degrees of freedom. In this talk I will discuss several novel phenomena that can be realized graphene q uantum Hall bilayers\, consisting of monolayer graphene separated by an int erlayer BN barrier. I will focus my discussion on recent studies of exciton condensates in these systems\, including potential identification of an ex citon liquid-to-exciton solid crossover\, as well as the first demonstratio n of correlated interlayer states in a three-layer system. Time permitting I will also present recent evidence for the appearance of novel multi-compo nent fractional quantum hall states in graphene bilayers\, including potent ial evidence of a new non-abelian state. The experimental opportunities in graphene quantum Hall bilayers and its relation to twisted bilayer graphene at zero magnetic field will be discussed.

    H ost Yang-Zhi Chou

    Email Rcawthor@umd.edu for Zoom details \;
    LAST-MODIFIED:20201111T180621Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201118T160000Z DTEND:20201118T170000Z DTSTAMP:20260828T094430Z UID:62rop5lr0g30rb4d8mnvuq8ggu@google.com CREATED:20200930T161927Z DESCRIPTION:Speaker: Dodson Group

    Title: Literature seminar for Jess ica Palko

    Abstract: TBA

    ZOOM: \;https://umd.zoom.us/j/93668799587?pwd=Mm42cjBra3IvN1h1NmMvY1QxNi 80QT09


     LAST-MODIFIED:20200930T162255Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhysJoint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200227T180000Z DTEND:20200227T190000Z DTSTAMP:20260828T094430Z UID:2dqsimt1r24nlps742ebijjunc@google.com CREATED:20200227T134554Z DESCRIPTION:


    Cosmic rays: the Call of the Plasma W ild.
    Noemie Globus (New York University/Flatiron Institute)

    Cosmic rays are one of the most fascinating high energy mess engers. They influence the interstellar and intergalactic medium through th e generation of magnetic turbulence\, the evolution of life on Earth\, and offer an environment for verification of extreme physics theories. Although their astrophysical sources remain a mystery\, new measurements from large air shower experiments have radically improved our knowledge of \;the highest energy cosmic rays. \;The recent report of a large scale "dipol e" anisotropy\, at 6 sigma significance level\, has been a breakthrough in cosmic ray physics. I will show how the dipole depends on the size of the c osmic ray observable universe\, which is set by an interplay between diffus ion in the magnetic turbulence and interactions with the photon backgrounds . I will discuss the cosmic ray acceleration mechanisms at powerful astroph ysical sources such as relativistic plasma jets associated with stellar or supermassive black holes\, and large scale shock waves around galaxy cluste rs. LAST-MODIFIED:20200227T134554Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181011T123000 DTEND;TZID=America/New_York:20181011T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181011T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Constructing Chaotic Coordinates for non-integrable dyna mical systems\nSpeaker: Dr. Stuart Hudson\nPrinceton Plasma Physics Laborat ory\n\nAbstract: Action-angle coordinates can be constructed for so-called integrable Hamiltonian dynamical systems\, for which there exists a foliati on of phase space by surfaces that are invariant under the dynamical flow. Perturbations generally destroy integrability. However\, we know that perio dic orbits will survive\, as will cantori\, as will the "KAM" surfaces that have sufficiently irrational frequency\, depending on the perturbation. Th ere will also be irregular "chaotic" trajectories. By "fitting" the coordin ates to the invariant structure that are robust to perturbation\, action-an gle coordinates may be generalized to non-integrable dynamical systems. The se coordinates "capture" the invariant dynamics and neatly partition the ch aotic regions. These so-called chaotic coordinates are based on a construct ion of almost-invariant surfaces known as ghost surfaces. The theoretical d efinition and numerical construction of ghost surfaces and chaotic coordina tes will be described and illustrated. LAST-MODIFIED:20181005T134646Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191120T210000Z DTEND:20191120T223000Z DTSTAMP:20260828T094430Z UID:3l1uhusthg3dfke58lriso1js7@google.com CREATED:20191115T175747Z DESCRIPTION:
    < /tbody>

    Title : "First Observatio n of Antimatter Wave Interference"
    Speaker Name: Marco Giammarchi
    Spe aker Institution : Istituto Nazionale de Fisica Nucleare
     \;
    Abst ract : In 1924 Louis de Broglie introduced the concept of wave-particle dua lity: the Planck constant h relates the momentum p of a massiveparticle to its de Broglie wavelength λ=h/p. The superposition principle is one of the main postulates of quantum mechanics\; diffraction and interference phenome na are therefore predicted and have been observed on objects of increasing complexity\, from electrons to neutrons and molecules. Beyond the early ele ctron diffraction experiments\, the demonstration of single-electron double -slit-like interference was a highly sought-after result. Initially propose d by Richard Feynman as a thought experiment it was finally carried out in 1976. A few years later\, positron diffraction was first observed. However\ , an analog of the double-slit experiment has not been performed to date on any system containing antimatter. Here we present the first observation of matter wave interference of single positrons\, by using a period-magnifyin g
    Talbot-Lau interferometer based on material diffraction gratings. Indi vidual positrons in the 8-14 keV energy range from a monochromatic beam wer e detected by high-resolution nuclear emulsions. The observed energy depend ence of fringe contrast proves the quantum-mechanical origin of the detecte d periodic pattern and excludes classical projective effects. Talbot-Lau in terferometers are well-suited to the experimental challenges posed by low i ntensity antimatter beams and represent a promising option for measuring th e gravitational acceleration of neutral antimatter. LAST-MODIFIED:20191115T175747Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201020T183000Z DTEND:20201020T200000Z DTSTAMP:20260828T094430Z UID:55t932p8jo0hs7rtfgp4mm71ia@google.com CREATED:20201014T143002Z DESCRIPTION:Email rcawthor@umd.edu for Zoom details \;

    2:30 pm - Faithful derivation of symmetry indicators: A case study for topological
    superconductors with time-reversal and inversion symmetrie s

    Speaker: Sheng-Jie Huang

    Abstract: Topologi cal crystalline superconductors have attracted rapidly rising attention due to
    the possibility of higher-order phases\, which support Majorana mod es on boundaries in d−2 or
    lower dimensions. However\, although the cla ssification and bulk topological invariants in such
    systems have been w ell studied\, it is generally difficult to faithfully predict the boundary
    Majoranas from the band-structure information due to the lack of well-e stablished bulk-boundary
    correspondence. In this talk\, I will talk abo ut a protocol for deriving symmetry indicators that
    depend on a minimal set of necessary symmetry data of the bulk bands and can diagnose
    boun dary features. Specifically\, to obtain indicators manifesting clear bulk-b oundary
    correspondence\, it’s crucial to combine the topological crysta l classification scheme in the real
    space and the twisted equivariant K theory in the momentum space. The key step is to
    disentangle the gener ally mixed strong and weak symmetry indicators through an algorithmic
    b asis-matching procedure between the real-space and momentum-space approache s. We
    demonstrate our protocol using an example of two-dimensional time -reversal odd-parity
    superconductors\, where the inversion symmetry is known to protect a higher-order phase with
    corner Majoranas. Symmetry i ndicators derived from our protocol can be readily applied to ab
    initio database and could fuel material predictions for strong and weak topologic al crystalline
    superconductors with various boundary features.

    3:00 pm - A Photon Mediated Peierls Transition

    Speaker: Colin Rylands

    Abstract: The Peierls instability is a cano nical example of phonon-driven strongly correlated
    physics\, intimately related to topological quantum matter and exotic superconductivity. In
    this talk I will present a method for realizing an analogous photon-mediat ed Peierls
    transition using a system of one-dimensional tubes of intera cting atoms trapped inside a
    multimode confocal cavity.

    3:30 pm - Hofstadter butterfly and Floquet topological insulators in minima lly
    twisted bilayer graphene

    Speaker: Yang-Zhi Chou

    Abstract: We theoretically study the Hofstadter butterfly of a t riangular network model in
    minimally twisted bilayer graphene. The band structure manifests periodicity in energy\,
    mimicking that of Floquet systems. The butterfly diagrams provide fingerprints of the model
    param eters and reveal the hidden band topology. In a strong magnetic field\, we establish that
    minimally twisted bilayer graphene realizes low-energy F loquet topological insulators (FTIs)
    carrying zero Chern number\, while hosting chiral edge states in bulk gaps. We identify the FTIs
    by analy zing the nontrivial spectral flow in the Hofstadter butterfly\, and by expl icitly computing
    the chiral edge states. Our theory paves the way for a n effective practical realization of FTIs in
    equilibrium solid-state sy stems.
    Reference: Phys. Rev. Research 2\, 033271 (2020)

    4:00 pm - Discussion LAST-MODIFIED:20201014T143002Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190204T200000Z DTEND:20190204T213000Z DTSTAMP:20260828T094430Z UID:3o69r52jkna3lf7u5grvhrf001@google.com CREATED:20190128T155526Z DESCRIPTION:


    < /center>
    Speaker: Alex Friedland\, SLAC

    Title:
    Physics and ast rophysics at DUNE


    Abstract:
    Deep Underground Neutrino Detecto r is a large international experiment\, with 1\,000+ members from 30+ count ries. As the collaboration has been putting together the Technical Design R eport\, due in 2019\, a number of interesting and unexpected physics questi ons have emerged. Such questions include how DUNE should measure neutrino e nergy and how well we understand neutrino-nucleus cross sections. I will di scuss some recent work done at SLAC on both fronts. In the second part of t he talk\, I will focus on the astrophysical capabilities of DUNE\, specific ally what can be learned from the next supernova neutrino burst. I will sho w that the signal is expected to tell us about physical processes close to the collapsed core\, such as the neutrino-driven wind and collective flavor oscillations of neutrinos. LAST-MODIFIED:20190204T142521Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190312T171500Z DTEND:20190312T181500Z DTSTAMP:20260828T094430Z UID:2hkvupkssvbv2hcott6da0bp8j@google.com CREATED:20190124T134419Z DESCRIPTION:Speaker: Professor Tianshu Li\, George Washington University\n\ nTitle: Complex Roles of Surface in Heterogeneous Ice Nucleation: Chemistry \, Topography and Confinement\n\nAbstract: Probing crystal nucleation at th e molecular level poses a major experimental challenge due to the ultrafine scale and stochastic nature of nucleation event. Molecular modeling can be a precious tool to help gain valuable insight into this complex process an d to test different hypotheses. In this talk I will show how a water/surfac e model helps unveil the surprisingly rich and complex behaviors of ice nuc leation. In particular\, heterogeneous ice nucleation is found to exhibit a complex dependence on surface chemistry\, surface topography\, and confine ment\, thus explaining why empirical criteria often fail to predict the nuc leation efficiency of an ice nucleator. The complex behaviors\, however\, a re also found able to be rationalized through the role of local ordering of water at interface. This gained insight can also help understand the nucle ation behaviors in many other materials. LAST-MODIFIED:20190221T194845Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190909T110000 DTEND;TZID=America/New_York:20190909T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20191217T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20191111T110000 EXDATE;TZID=America/New_York:20191216T110000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com CREATED:20190906T171016Z DESCRIPTION:Title: \n\nSpeaker:\n\nAbstract: LAST-MODIFIED:20190916T180047Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181120T181500Z DTEND:20181120T191500Z DTSTAMP:20260828T094430Z UID:1arg232qo870f9blcl3o5nf1f8@google.com CREATED:20180905T133145Z DESCRIPTION:Speaker: Anna Frishman\, Princeton Center for Theoretical Sc ience

    Title: Learning Force Fields From Stochastic Trajectori es

    Abstract: Particles in biological and soft matt er systems undergo Brownian dynamics: their deterministic motion\, induced by forces\, competes with random diffusion due to thermal noise. More broad ly\, Brownian dynamics is a generic and simple model for dynamical systems with noise. Provided only with the time-series of positions of such a syste m\, i.e a trajectory in phase space\, it is challenging to infer what force field had produced it. At the same time\, this is the key information abou t the dynamical system\, which would allow to characterize it completely. I will show that there is an information-theoretic bound on the rate at whic h information about the force field can be extracted from a trajectory\, qu antified by a channel capacity. I will discuss the relation between this ca pacity and the entropy production rate\, as defined in stochastic thermodyn amics. I will then present a practical method\, Stochastic Force Inference\ , that uses the information contained in a trajectory to approximate force fields. This technique also permits the evaluation of out-of-equilibrium cu rrents and entropy production. It thus makes it possible to quantify subtle time-irreversibility in biological systems at the mesoscale\, and opens th e door to an understanding of the importance of time- irreversibility.  \; \; LAST-MODIFIED:20181119T133636Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190612T200000Z DTEND:20190612T210000Z DTSTAMP:20260828T094430Z UID:5rkkbvni71l3nhq1tk3fnqfhnh@google.com CREATED:20190607T194236Z DESCRIPTION:Title : Understanding the dynamics of zonal flows through quant umlike modeling of drift-wave turbulence\n\nSpeaker: Ilya Dodin\, Princeton Plasma Physics Laboratory \n\nAbstract : In inhomogeneous magnetized plasm a\, drift-wave (DW) turbulence can generate banded sheared flows\, called z onal flows (ZFs)\, which significantly affect turbulent transport. Since DW wavelengths are typically less than the corresponding ZF scales L\, the tr aditional wave-kinetic theory calculates the DW Hamiltonian under the appro ximation of infinite L\, leading to a geometrical-optics model of DWs as cl assical quasiparticles. However\, this model happens to be inconsistent and \, unless modified ad hoc\, cannot reproduce important features of ZF-DW in teractions. We propose a different approach. By starting with the modified Hasegawa-Mima equation (or alternatively\, the modified Terry-Horton equati on)\, we rigorously derive a model in which finite-L corrections are retain ed and DWs are generally described as quantum particles with finite wavelen gth. Then\, inhomogeneous DW turbulence is understood as effective quantum plasma where the ZF velocity serves as a collective field through which DWs interact [1-5]. The talk will briefly overview this general theory and the n focus on its recent applications to the following topics: (i) propagating solitary structures and their relation to ZFs [6]\; (ii) nonlinear oscilla tions of collisionless ZFs [7]\; (iii) cross-scale interactions in DW turbu lence [8]\; and (iv) the Dimits shift [8].\n\n[1] D. E. Ruiz\, J. B. Parker \, E. L. Shi\, and I. Y. Dodin\, Zonal-flow dynamics from a phase-space per spective\, Phys. Plasmas 23\, 122304 (2016).\n[2] D. E. Ruiz\, M. E. Glinsk y\, and I. Y. Dodin\, Wave kinetic equation for inhomogeneous drift-wave tu rbulence beyond the quasilinear approximation\, J. Plasma Phys. 85\, 905850 101 (2019).\n[3] H. Zhu\, Y. Zhou\, and I. Y. Dodin\, On the structure of t he drifton phase space and its relation to the Rayleigh-Kuo criterion of th e zonal-flow stability\, Phys. Plasmas 25\, 072121 (2018).\n[4] H. Zhu\, Y. Zhou\, D. E. Ruiz\, and I. Y. Dodin\, Wave kinetics of drift-wave turbulen ce and zonal flows beyond the ray approximation\, Phys. Rev. E 97\, 053210 (2018).\n[5] H. Zhu\, Y. Zhou\, and I. Y. Dodin\, On the Rayleigh-Kuo crite rion for the tertiary instability of zonal flows\, Phys. Plasmas 25\, 08212 1 (2018).\n[6] Y. Zhou\, H. Zhu\, and I. Y. Dodin\, Formation of solitary z onal structures via the modulational instability of drift waves\, Plasma Ph ys. Control. Fusion 61\, 075003 (2019).\n[7] H. Zhu\, Y. Zhou\, and I. Y. D odin\, Nonlinear saturation and oscillations of collisionless zonal flows\, arXiv:1902.04970\, to appear in New J. Phys.\n[8] yet to be unpublished. LAST-MODIFIED:20190607T194243Z LOCATION:AVW 3460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191017T123000 DTEND;TZID=America/New_York:20191017T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191017T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Using machine learning to assess short term causal depen dence and infer network links\nSpeaker: Amitava Banerjee\nUniversity of Mar yland | Department of Physics and IREAP\n\nAbstract: The general problem of determining causal dependences in an unknown time evolving system from obs ervations is of great interest in many fields. Examples include inferring n euronal connections from spiking data\, deducing causal dependences between genes from expression data\, discovering long spatial range influences in climate variations\, etc. Previous work has tackled such problems by consid eration of correlations\, prediction impact\, or information transfer metri cs. Here we propose a new method that leverages the ability of machine lear ning to generalize from examples\, combined with concepts from dynamical sy stems theory. We test our proposed technique on numerical examples obtainin g results that suggest excellent performance for a large range of situation s. An important\, somewhat surprising\, conclusion is that\, although our r ationale is based on noiseless deterministic systems\, dynamical noise can greatly enhance our technique's effectiveness. LAST-MODIFIED:20190829T174746Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190124T203000Z DTEND:20190124T213000Z DTSTAMP:20260828T094430Z UID:1u60j951r3ijkj5nc06sfbn0vi@google.com CREATED:20190107T152309Z DESCRIPTION:Title : Energy transfer and electron energization in collisionl ess magnetic reconnection for different guide-field intensities\n\nSpeaker: Fulvia Pucci\, Princeton Plasma Physics Laboratory \n\nAbstract : Electron dynamics and energization are a key component of magnetic field dissipatio n in collisionless reconnection. In 2D reconnection\, the main mechanism th at limits the current density and provides an effective dissipation is most probably the electron pressure tensor term\, that has been shown to break the frozen-in condition at the x-point. In addition the electron- meanderin g-orbit scale controls the width of the electron dissipation region\, where the electron temperature is observed to increase both in recent MMS observ ations as well as in laboratory experiments (MRX). By means of two-dimensio nal\, full-particle simulations in an open system (Pei et al. 2001\; Ohtani and R. Horiuchi 2009)\, we investigate how the energy conversion and parti cle energization depends on the guide field intensity. We study the energy transfer from the electromagnetic field to the plasma\, and the threshold g uide field separating when parallel and perpendicular energy transfers domi nate\, confirming recent MRX results\, in agreement with MMS observations. We calculate the energy partition between fields and kinetic and thermal en ergy of different species\, from the electron scales to ion scales\, showin g there is no significant variation for different guide field configuration s. We study electron distribution functions and self consistently evolved p articles orbits for high guide field configuration\, investigating possible mechanisms for electron perpendicular heating. Finally I will give an idea of our 2D simulations with plasmoids for which the setup can be easily ext ended to study 3D reconnection\, thanks to GPU technology. LAST-MODIFIED:20190121T185830Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180928T170000Z DTEND:20180928T180000Z DTSTAMP:20260828T094430Z UID:4ig537o3pql0pa58pdbepg13g7@google.com CREATED:20180905T150304Z DESCRIPTION:Speaker: Yifei Mo\, Assistant Professor\, Materials Science & E ngineering\, UMCP\n\nTitle: Computation Accelerated Design of Materials and Interfaces for Solid-State Batteries\n\nAbstract: All-solid-state Li-ion b attery based on solid electrolytes is a promising next-generation battery t echnology with high energy density\, intrinsic safety\, long cycle life\, a nd wide operational temperatures. However\, multiple challenges\, such as l ow ionic conductivity of solid electrolytes and poor interfacial compatibil ity at the solid electrolyte-electrode interfaces\, are impeding the develo pment of this new battery technology. To resolve these materials challenges \, we develop and leverage an array of computation techniques to provide un ique materials insights into the fundamental materials limitations and to e stablish general design principles of materials and solid interfaces. Our f irst-principles atomistic modeling studies reveal the origin of ultra-fast Li+ diffusion in lithium super-ionic conductors. Based on the newly gained understanding\, we establish design principles for fast ion-conductor mater ials\, and demonstrate these design principles for the computation discover y and design of new lithium super-ionic conductors. In addition\, we develo ped thermodynamic calculations based on the materials-genome database for i nvestigating the compatibility of heterogeneous interfaces between solid el ectrolytes and electrodes. Key factors affecting the compatibility of the s olid electrolyte-electrode interfaces are identified\, and interfacial desi gn strategies are proposed from our thermodynamic computation. The demonstr ated computation capabilities represent a transferable model in designing n ew materials and interfaces for emerging technologies. LAST-MODIFIED:20180927T131840Z LOCATION:Chem/Nuclear Engr Room 2108 Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190412T170000Z DTEND:20190412T180000Z DTSTAMP:20260828T094430Z UID:6re41cul9mr10edmllvg9n4l1d@google.com CREATED:20190124T142620Z LAST-MODIFIED:20190402T141246Z LOCATION:2110 Chemical & Biomolecular Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191105T181500Z DTEND:20191105T191500Z DTSTAMP:20260828T094430Z UID:1j19s1epctu7ktpvp68bp4dm3v@google.com CREATED:20190820T132106Z DESCRIPTION:Speaker: Professor Daniel Zuckerman\, Oregon Health and Science University\n\nTitle: Essential Trajectory Physics and Its Application to S ampling and Data Analysis\n\nAbstract: "Trajectory physics" - the equilibri um and non-equilibrium behavior of trajectory ensembles - can be understood with a minimum of formalism and sheds light on several key phenomena: the meaning of "mechanism" in molecular behavior\, limitations of Markovian des criptions\, and the relation of long timescales to instantaneous ensemble p roperties. The theory also can be exploited for efficient computer simulati ons. Sampling rare events unlikely to occur in standard simulations\, such as protein folding\, remains a challenge in computational statistical mecha nics. The "weighted ensemble" (WE) strategy is grounded in trajectory physi cs and recapitulates unbiased dynamical behavior\, notably consistency with a Fokker-Planck description. However\, the resampling employed in WE intro duces correlations and variance that can render practical calculations surp risingly difficult. The talk will discuss the theory of WE simulation and n on-Markovian aspects of data analysis\, with examples of successes and chal lenges in the simulation of rare biomolecular events. LAST-MODIFIED:20191029T164502Z LOCATION:IPST 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191119T181500Z DTEND:20191119T191500Z DTSTAMP:20260828T094430Z UID:3tu6qamcnar6pgsdoinp80v6bu@google.com CREATED:20190910T141325Z DESCRIPTION:Speaker: Professor Michele Parrinello\, ETH Zurich\, Switzerlan d\n\nTitle: Enhanced Sampling Approaches in Molecular Dynamics Simulatins\n \nAbstract: In many fields of science\, computer simulations are pervasivel y used to solve difficult problems. Many systems of interest exhibit long l ived metastable states separated by high barriers\, and only rarely occurri ng fluctuations allow the system to cross these barriers. This makes the tr ansitions from one metastable state to another rare events. Although rare\, these events are crucial for a correct description of the system. Phenomen a such as nucleation and protein folding are examples of rare events. Unfor tunately\, the time scale of standard simulation falls short of what needed . We present a number of novel approaches aimed at alternating this problem . LAST-MODIFIED:20191112T160432Z LOCATION:1116 IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191010T200000Z DTEND:20191010T210000Z DTSTAMP:20260828T094430Z UID:3i6hkgtflhtvkv7ncdrrc79d75@google.com CREATED:20191008T193633Z DESCRIPTION:Speaker: Prasanth Shyamsundar\, University of Florida\n\nTitle: Next generation kinematic variables for signal discovery and measurement i n colliders\n\nAbstract: High energy physics data\, even at the parton leve l\, is high dimensional. Analyzing the distribution of collider events in t he full phase-space comes with several challenges--insufficient computation al resources to scan the full phase-space\, insufficient data to populate i t\, difficulty in validating monte carlo in the full phase-space\, etc.\n\n One way to address the curse of dimensionality is to reduce it. At the part on level\, this is typically done by constructing kinematic event variables . But this dimensionality reduction is accompanied by information loss\, so it becomes important to construct "good" event variables that capture the main features of the phase-space distribution and minimize information loss .\n\nConstruction of good event variables is a challenging task for event t opologies with missing particles in the final state. In this talk we'll loo k at a new class of kinematic event "variables" that can produce mass bumps even for event topologies with missing particles. And in the process\, we' ll introduce a brand new way of visualizing and representing high dimension al data\, which can open up a world of possibilities for new data analysis techniques. LAST-MODIFIED:20191011T140730Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200402T150000Z DTEND:20200402T160000Z DTSTAMP:20260828T094430Z UID:5fe6126er7ikq99ovens6f7j7q@google.com CREATED:20200326T173632Z DESCRIPTION:

    https://mse.umd.edu/event/15037/mse-special-seminar-printabl e-quantum-dot-inks-for-next-generation-infrared-optoelectronics

    S peaker: \;Mengxia Liu\, \;Postdoctoral Fellow\, Cav endish Laboratory\, University of Cambridge

    Title: \ ;Printable quantum dot inks for next-generation infrared optoelectronic s

    Abstract:

    Optoelectronic devic es operating in the infrared region are of utmost importance\, crosscutting different fields with applications in energy harvesting\, gas sensing\, ni ght vision\, and medical diagnosis. Present-day infrared technologies rely on high-quality epitaxially grown semiconductors\, such as III-V materials. This materials platform is incompatible with CMOS technology that underpin s modern consumer electronics. Alternatives to conventional materials are e xpected to bring new functionalities to the consumer market. \;< /p>

    Colloidal quantum dots\, solution-processed semiconductor nanoc rystals\, offer a powerful platform for infrared applications. Their optoel ectronic properties can be widely tuned by changing the size and surface ch emistry\, and they allow for low-temperature deposition from solution over large areas using available manufacturing. These enable their integration i n many systems such as multi-junction photovoltaics to complement the perfo rmance of silicon solar cells\, as well as light sources and photodetectors . \;

    In this talk\, I will present some examples of the use of quantum dots as a building block for high- performance optoelect ronic devices. Firstly\, I will introduce novel surface engineering strateg ies to produce printable quantum dot inks that enable single-junction quant um dot solar cells with a certified record power conversion efficiency. I w ill also show their potential to complement silicon photovoltaics and elect rode engineering strategies to improve device performance. Secondly\, I wil l present the liquid-phase heteroepitaxial growth of inorganic perovskite a round quantum dots. This work demonstrates\, for the first time\, that latt ice matching between solution-processed semiconductors contributes to mater ials stability exceeding that of each constituent. The new combination of m aterials enables the realization of electronic properties not available in the single-phase constituents. I will then discuss the recent work on nanos cale exciton dynamics and transport in hybrid structures. This work – using the state-of-the-art transient absorption microscopy – provides fundamenta l insights into the transport mechanism at hybrid interfaces and guides the materials design for future optoelectronics. Finally\, I will conclude my talk with an outlook on solution-processed hybrid structures towards infrar ed light sources and photodetectors.


    LAST-MODIFIED:20200331T153619Z LOCATION:VIA ZOOM ONLY - No campus location SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181214T180000Z DTEND:20181214T190000Z DTSTAMP:20260828T094430Z UID:371mui1allg9ar7tu5dgdld3e2@google.com CREATED:20181204T133612Z LAST-MODIFIED:20181204T133612Z LOCATION:2108 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMIAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170213T110000 DTEND;TZID=America/New_York:20170213T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170213T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Michael Zwolak\n\nSpeaker Institution: NIST\n\nT itle: An energy-resolved atomic scanning probe\n\nAbstract: The density of states is a concept that is ubiquitous in classical and quantum physics\, s ince it quantifies the energy distribution of states available in a system. Spectroscopic means allow its measurement over the entirety of a system's energy spectrum\, but do not generally provide spatial resolution. Moreover \, scanning probes measure the density of states locally at the position of the probe tip\, but typically do not have access to the whole spectrum. He re\, we show how the local density of states over the whole energy spectrum can be measured in atomic gases. This probe provides a simple\, yet quanti tative operational definition of a local density of states for both interac ting and non-interacting systems as the rate at which particles can be siph oned from the system of interest by a narrow energy band of non-interacting states. We demonstrate that ultra-cold atomic lattices are a natural platf orm for implementing this concept and visualize the energy and spatial depe ndence of the atom density in inhomogeneous\, interacting lattices. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200317T160000 DTEND;TZID=America/New_York:20200317T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200317T160000 CREATED:20190530T191015Z LAST-MODIFIED:20200311T162315Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190709T180000Z DTEND:20190709T190000Z DTSTAMP:20260828T094430Z UID:3bnm9onag5nf13kne8gut1mbjc@google.com CREATED:20190628T143418Z DESCRIPTION:Title: Equilibration and dynamics of correlation functions in q uantum many-body systems \n\nSpeaker: Luis Pedro Garcia-Pintos\, University of Massachusetts Boston \n\nAbstract: I will begin by reviewing general re sults on the equilibration of isolated quantum systems\, including sufficie nt conditions for equilibration and a discussion of the timescales of this equilibration process. I will then focus on new results on the dynamics of two-point correlation functions. These include conditions under which corre lation functions factorize at late times\, and bounds on their temporal flu ctuations. For auto-correlation functions we provide an upper bound on the timescale at which they reach the factorized late time value. Remarkably\, this bound holds for arbitrary systems\, is only a function of local expect ation values\, and does not increase with system size. We give numerical ex amples that show that this bound is a good estimate in non-integrable model s. Our study extends to further classes of two-point functions such as the symmetrized ones and the Kubo function that appears in linear response theo ry. LAST-MODIFIED:20190628T202425Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190215T180000Z DTEND:20190215T190000Z DTSTAMP:20260828T094430Z UID:1qq2buegsi0fjr03uob3vgoni2@google.com CREATED:20190124T140723Z DESCRIPTION:Speaker: U. Balu Balachandran\, Distinguished Group Leader\, Ce ramics & Covetic Materials\, Argonne National Laboratory\n\nTitle: Nanotech nology to Overcome Material Challenges for Sustainable Energy System\n\nAbs tract: The growing demand for energy\, brought about by global population g rowth and the rising standard of living in the developing world\, has made it imperative that cleaner and more sustainable means for energy production \, conversion\, storage\, and utilization be found to sustain and grow the world economy. Sustainable development is development that meets the needs of the present without compromising the ability of future generations to me et their own needs. The search for smaller\, cheaper\, environmentally frie ndly\, and more efficient sustainable energy technologies is intimately con nected to the development of new materials. Dramatic breakthroughs are taki ng place in the fields of solar cells\, fuel cells\, power electronics\, re chargeable batteries\, high temperature superconductors\, hydrogen producti on/storage\, etc. In most of these cases\, the development and commercializ ation of the environmentally friendly energy technologies is limited by ava ilability of materials. Therefore\, it is essential to understand the funda mentals of structure-processing-properties relationship of materials and ap ply those fundamentals for developing materials for different applications to meet the ever-growing demand for energy. Nonscientists will be the ones getting to the bottom of the world’s energy problems because all elementary steps of energy conversion/utilization take place on the nanoscale. Unders tanding and controlling the properties of nanostructured materials can brin g new technologies to the marketplace that help solve major challenges in s ustainable energy. It is essential that scientists working in the area of a lternate energies should keep in mind both the economics and ethics of thei r inventions. Use of prohibitively expensive materials for tackling the sus tainable energy technologies should be avoided at all costs for obvious rea sons. Likewise\, scientists should also be cognizant of socio-economic fact ors in designing new technologies. As an example\, ever since the productio n of ethanol from corn became an industrial reality\, the cost of corn rose exponentially and adversely interfered with the human and animal food chai n. It takes more than science to address the future energy needs of the soc iety. In this talk\, I will present few examples of technical barriers/rese arch opportunities in developing materials for sustainable energy system. LAST-MODIFIED:20190124T141048Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181203T110000 DTEND;TZID=America/New_York:20181203T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181203T110000 CREATED:20180829T133041Z DESCRIPTION:Title: \n\nSpeaker: Johnpierre Paglione\, UMD\n\nAbstract: LAST-MODIFIED:20181105T144658Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191009T183000Z DTEND:20191009T200000Z DTSTAMP:20260828T094430Z UID:6q3khstt705niiv2a5i3hdq16r@google.com CREATED:20191007T132552Z DESCRIPTION:Speaker: Christopher Verhaaren\, University of California Irvin e\n\nTitle: Constructing and Exploring Charged Myers-Perry Black Holes\n\nA bstract: Though Myers and Perry provided the metric for arbitrarily rotatin g black holes in all dimension more than 30 years ago\, the addition of ele ctric charge to the black hole remains unsolved. Both analytical and numeri cal analysis have relied on special cases of to make progress\, and so thei r results are correspondingly limited. In this talk I outline a method for obtaining the general charged Myers-Perry black hole in 4+1 dimensions\, th rough a combination of analytic and numeric techniques. These methods also bring to light interesting and novel properties of charged rotating black h oles\, which I will discuss. I present our current results in this program and the physics questions we hope to address with these new black hole solu tions. LAST-MODIFIED:20191007T132552Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190408T190000Z DTEND:20190408T203000Z DTSTAMP:20260828T094430Z UID:03ub8838di7uoq3qnnr28gffcj@google.com CREATED:20190128T180502Z DESCRIPTION:

    Yang Bai\, UW-Ma dison
    Title Electroweak symmetric dark matter ball

    Abstract: In the simple "Higgs-portal" dark matter model\, there exis t non-topological soliton states of dark matter. These states could be the lowest-energy states for a fixed and large dark matter number and have thei r interior in an electroweak symmetric phase. Although their masses are typ ically very heavy and above the Planck mass\, the dark matter balls can app ly a Higgs-vacuum force on ordinary matter and be potentially detected by a large-size detector like in neutrino experiments. LAST-MODIFIED:20190403T132317Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190213T203000Z DTEND:20190213T213000Z DTSTAMP:20260828T094430Z UID:3ccl3ofd6cra8irecinjggrnok@google.com CREATED:20190208T155835Z DESCRIPTION:\nTitle : Turbulent Dynamo in a Collisionless Magnetized Plasma \nSpeaker Name: Denis St-Onge\nSpeaker Institution : Princeton Plasma Physi cs Laboratory\n\nAbstract : The Universe is magnetized. While magnetic-fiel d strengths of just ~10^{-18} G are required to achieve this both in our Ga laxy and in clusters of galaxies\, observations of Faraday rotation\, Zeema n splitting\, and synchrotron emission all make the case of ubiquitous ~mic roGauss fields. That these systems are not content with hosting weaker fiel ds is surprising\, at least until one realizes that the energy density of a ~microGauss field is comparable to that of the observed turbulent motions. It is then natural to attribute the amplification and sustenance of (at le ast the random component of) the interstellar and intracluster magnetic fie lds to the fluctuation (or "turbulent") dynamo. In this talk\, we will expl ore the various ways in which plasma microphysics makes magnetic-field ampl ification in weakly collisional plasmas by macroscale turbulent motions pos sible\, with application to the intracluster medium of galaxy clusters. LAST-MODIFIED:20190208T155835Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181129T180000Z DTEND:20181129T193000Z DTSTAMP:20260828T094430Z UID:1vhk4brmr763rh3gq3fr8mkdlb@google.com CREATED:20180828T143656Z DESCRIPTION:Speaker: Alessandro Roggero\, University of Washington\n\nTitle : tk\n\nAbstract: tk LAST-MODIFIED:20181101T154507Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201106T170000Z DTEND:20201106T174500Z DTSTAMP:20260828T094430Z UID:38fo0dog6b6mpaoon6vcoj7aig@google.com CREATED:20201026T190313Z DESCRIPTION:Title : Fault-Tolerant Operation of a Quantum Error-Correction Code
    Speaker : Laird Egan (JQI)
    Time : \;12 - 12:45pm\, Friday\, Nov. 6

    Seminar will be held via Zoom: \;https://umd.zoom.us /j/97099328991 \;and Meeting ID : 970 9932 8991


    Q uantum error-correction remains a critical component to realizing the full promise of quantum algorithms.  \;In this talk\, I will discuss experim ental progress towards creating and controlling logical qubits on a trapped ion quantum computer. Our code of choice is the Bacon-Shor [[9\,1\,3]] sub system code\, which consists of 9 data qubits\, encoding 1 logical qubit\, with stabilizer measurements mapped to 4 ancilla qubits capable of correcti ng any single qubit error. Recently\, we have experimentally demonstrated f ault-tolerant preparation\, rotation\, syndrome extraction\, and measuremen t of a logical qubit.  \;Remarkably\, the logical qubit exceeds the fid elity of the entangling operations used to create it.  \;Additionally\, we measure the four Bacon-Shor stabilizer generators directly and are able to detect single qubit Pauli errors. \;Looking forward\, we will lay o ut the near-term path for achieving multiple rounds of \;error correcti on and logical CNOT gates. (https://arxiv.org/abs/2009.11482) LAST-MODIFIED:20201026T190549Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191209T190000Z DTEND:20191209T200000Z DTSTAMP:20260828T094430Z UID:1ovrgng02f06t5dc058ieamtft@google.com CREATED:20191115T001109Z DESCRIPTION:\n\nTitle: \n\nQuantum simulation of high-energy physics - micr oscopic and macroscopic approaches\n\nTorsten Zache\, Heidelberg University \n\n\nAbstract:\nThe unprecedented control of synthetic quantum systems all ows to tackle outstanding questions from high-energy physics\, such as the non-equilibrium dynamics of gauge theories\, using quantum simulators. In t his talk\, I will first discuss dynamical topological transitions in quantu m electrodynamics (QED) in one spatial dimension [1]\, which bear similarit ies with the physics of topological insulators. This phenomenon is accessib le within our proposals to microscopically engineer the Hamiltonian of latt ice QED with a mixture of ultracold gases [2]. These efforts recently resul ted in a proof-of-principle experiment demonstrating an elementary building block for U(1) lattice gauge theories [3]. In the second part of my talk\, I will discuss a complementary approach\, based on large-scale analog quan tum simulators probing the many-body limit described by quantum field theor y (QFT). Within an equal-time formulation of QFT\, we established a procedu re to extract irreducible correlations\, enabling the measurement of effect ive interaction vertices [4]. This is verified at the example of the sine-G ordon model in thermal equilibrium\, quantum simulated by two tunnel-couple d superfluids. We further applied this approach to a spinor Bose gas out-of -equilibrium [5]\, revealing universal dynamics of an effective vertex in a regime where standard kinetic descriptions fail.\n\n[1] Zache et al\, Phys . Rev. Lett. 122\, 050403\n[2] Zache et al\, Quantum Sci. Technol. 3 034010 \n[3] Mil et al\, arXiv:1909.07641\n[4] Zache et al\, arXiv:1909.12815\n[5] Prüfer et al\, arXiv:1909.05120 LAST-MODIFIED:20191115T001109Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI-QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181213T203000Z DTEND:20181213T220000Z DTSTAMP:20260828T094430Z UID:7rsgbc6908duk20k0rc6b4oh7l@google.com CREATED:20181106T162548Z DESCRIPTION:

    Title: Primordial Standard Clocks as a Direct Probe of the Scenario of the Primordial Universe \;

    Speaker: Xingang Chen\, Harvard Unive rsity

    Abstract: How to model-independently distinguish the inflation scenario from alternatives to inflation is an important challenge in moder n cosmology. In this talk\, we show that massive fields in the primordial u niverse can function as standard clocks and imprint clock signals in the de nsity perturbations that directly record the scale factor of the universe a s a function of time\, a(t). This function is the defining property of any primordial universe scenario\, so can be used to falsify competing scenario s in a model-independent fashion. The signals also encode the mass and spin spectra of the particle physics at the extreme high energy scale of the pr imordial universe. \; LAST-MODIFIED:20181213T135305Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191121T210000Z DTEND:20191121T223000Z DTSTAMP:20260828T094430Z UID:6e3cav0til1ag7lfuo8dperj7d@google.com CREATED:20191018T145136Z DESCRIPTION:Speaker: Gabriele Rigo\, Syracuse University

    Title: Neut ron Star Mergers Chirp About Vacuum Energy


    Abstract: Observatio ns of gravitational waves from neutron star mergers open up novel direction s for exploring fundamental physics: they offer the first access to the str ucture of objects with a non-negligible contribution from vacuum energy to their total mass. By considering three commonly used neutron star models we show that for large chirp masses the effect of vacuum energy on the tidal deformabilities can be sizable. Measurements of this sort have the potentia l to provide a first test of the gravitational properties of vacuum energy independent from the acceleration of the Universe\, and to determine the si ze of QCD contributions to the vacuum energy.

    Slides LAST-MODIFIED:20191122T162206Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201116T200000Z DTEND:20201116T210000Z DTSTAMP:20260828T094430Z UID:7k7oaj3fkrfhqja8562f1uc79j@google.com CREATED:20200817T181627Z DESCRIPTION:Seminar to be conducted via zoom.

    Speaker: Matthew Reece \, Harvard

    Title: A Swampland Tour\, From Global Symmetries to Axion Physics.”

    Abstract: The Swampland program aims to distinguish effe ctive quantum field theories that can potentially arise within UV-complete quantum gravity theories (“the Landscape”) from those that cannot (“the Swa mpland”). The most well-established such criterion is that theories of quan tum gravity never have exact global symmetries. I will discuss some general izations and consequences of this idea. In particular\, I will discuss work in progress (with Heidenreich\, McNamara\, Montero\, Rudelius\, and Valenz uela) on how axion fields often play a crucial role in banishing global sym metries from a theory\, with potential phenomenological implications.
    For zoom link to seminar please email mk nouse@umd.edu LAST-MODIFIED:20201113T213437Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200909T190000Z DTEND:20200909T200000Z DTSTAMP:20260828T094430Z UID:1gjfbg2rmkm5tj698saaklhjep@google.com CLASS:PUBLIC CREATED:20200902T002042Z DESCRIPTION:Speaker: Victor Yakovenko

    Title: Loop currents and anoma lous Hall effect due to time-reversal-breaking superconductivity

    Abs tract: It was found experimentally that superconductivity spontaneously bre aks time-reversal symmetry (TRS) in such materials as Sr2RuO4\, UPt3\, URu2 Si2\, and Bi/Ni bilayers. For the latter material\, we argue that the super conducting order parameter has the winding number of +-2 around the Fermi s urface\, thus making Bi/Ni bilayers a rare example of intrinsic 2D topologi cal superconductivity [1]. The experimental evidence for TRS breaking comes from the polar Kerr effect\, which is rotation of polarization of normally incident light upon reflection from the sample. For a clean superconductor \, theoretical studies indicate that this effect is possible only if electr ons have more than one band. To clarify these conditions\, we study a model of chiral TRS-breaking superconductivity on the honeycomb lattice with pai ring between different sublattices [2]. We show that the experimental manif estations of TRS breaking can be characterized using the TRS-odd commutator of the superconducting pairing potential and its Hermitian conjugate. It g enerates persistent loop currents around each lattice site and opens a topo logical mass gap at the Dirac points with the corresponding chiral edge sta tes\, as in Haldane's model of the quantum anomalous Hall effect. It also g enerates the intrinsic ac Hall conductivity in the absence of an external m agnetic field\, which determines the polar Kerr effect. We also speculate o n a possibility of breaking Z2 time-reversal and U(1) gauge symmetries in t wo separate phase transitions.

    [1] X. Go ng\, M. Kargarian\, A. Stern\, D. Yue\, H. Zhou\, X. Jin\, V. M. Galitski\, V. M. Yakovenko\, and J. Xia\, "Time-reversal symmetry-breaking supercondu ctivity in epitaxial bismuth/nickel bilayers"\, Science Advances 3\, e16025 79 (2017)

    [2] P. M. R. Brydon\, D. S. L. Abergel\, D. F. Agterberg\, and V. M. Yakovenko\, "Loop currents and anoma lous Hall effect from time-reversal symmetry-breaking superconductivity on the honeycomb lattice"\, Phys. Rev. X 9\, 031025 (2019)

    https://sites. google.com/view/quantum-matter-seminar/yakovenko

    Subscribe https://sites.google.com/view/quantum-matter-seminar /subscribe

    YouTube https://www.youtube.com/channel/UCDreey-YkN6oKQzhsc4_ wjg LAST-MODIFIED:20200902T002243Z LOCATION:Northeastern University\, Boston on Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190128T110000 DTEND;TZID=America/New_York:20190128T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190128T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Quantum Diamond Sensors\n\n\nSpeaker: Ronald Walsworth\, Harvard\n\nAbstract: In recent years\, optically probed nitrogen–vacancy ( NV) quantum defects in diamond have become a leading modality for magnetic\ , electrical\, and temperature sensing at short length scales (nanometers t o millimeters) under ambient conditions. This technology has wide-ranging application across the physical and life sciences — from NMR spectroscopy a t the scale of individual cells to improved biomedical diagnostics to probi ng magnetic materials. I will provide an overview of quantum diamond senso rs and their diverse applications. LAST-MODIFIED:20190128T131012Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190508T200000Z DTEND:20190508T210000Z DTSTAMP:20260828T094430Z UID:0lc9j1960ufgi9e77utomshp9v@google.com CREATED:20190501T180500Z DESCRIPTION:Title : Realisability of discontinuous MHD equilibria\n\nSpeake r: Adelle Wright\, Australian National University \n \nAbstract : Smooth 3D MHD equilibria with non-uniform pressure may not exist but\, mathematicall y\, there exist 3D MHD equilibria with non-uniform\, stepped pressure profi les. The pressure jumps occur at surfaces with highly irrational values of rotational transform and generate singular current sheets. If physically re alisable\, how such states form dynamically remains to be understood. To be physically realisable states\, MHD equilibria must exist for some non-triv ial timescale\, meaning they must be at least be ideally stable and suffici ently stable to the fastest growing resistive instabilities. This presentat ion will discuss recent progress towards understanding discontinuous MHD eq uilibria via a stability analysis of a continuous cylindrical equilibrium m odel with radially localised pressure gradients\, which examines how the re sistive stability characteristics of the model change as the localisation o f pressure gradients is increased to approach a discontinuous pressure prof ile in the zero-width limit. LAST-MODIFIED:20190501T180508Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191213T180000Z DTEND:20191213T190000Z DTSTAMP:20260828T094430Z UID:3imfce8ss3r76uftorpcv9mu59@google.com CREATED:20191203T141822Z LAST-MODIFIED:20191203T141822Z LOCATION:1116 Iribe Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181203T213000Z DTEND:20181203T223000Z DTSTAMP:20260828T094430Z UID:7h1re4epguorqem3v0rlsa6phd@google.com CREATED:20181122T010924Z DESCRIPTION:Title: Magnetic Reconnection at Earth's Magnetopause: The Magne tospheric Multiscale (MMS) Mission and Kinetic Simulations

    Speaker: Marc Swisdak\, University of Maryland

    Abstract: The MMS mission is a constellation of four closely spac ed spacecraft designed to observe magnetic reconnection in the Earth's magnetosphere . Its unprecedented spatial and temporal resolution has\, for the first tim e\, allowed a close comparison between the predictions from kinetic simulat ions and reconnection as it occurs in nature. Among the surprises has been the formation and impact of turbulence near the reconnection X-line and the development of strongly localized dissipation. Many of features seen in MM S data can be reproduced by simulations.

    Notes: Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20181122T010924Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200923T200000Z DTEND:20200923T213000Z DTSTAMP:20260828T094430Z UID:2s593r89dnghj2f5rpcuk40or5@google.com CREATED:20200921T180157Z DESCRIPTION:Title : Observation of Production of Three Massive Gauge Bosons
    Speaker Name: Philip Chang
    Speaker Institution : University of Calif ornia at San Diego
    Notes: The talk can be accessed on Zoom:

    https://umd.zoom.us/j/91943906688?pwd=b2FEK2wwTldPNGNWRURQS2R5UW 5Mdz09

    Meeting ID: 919 4390 6688

    Passcode: 214353


    Abstract : The three massive gauge boson VVV (V = W\, Z) productio n at the LHC is interesting because measurements of such processes can prob e the interactions between massive bosons including the Higgs. Up until rec ently\, such measurements have remained elusive because of low production c ross sections. This talk will discuss the recent CMS result of first observ ation (5.7σ) of combined VVV production at the CERN LHC and evidences for W WW (3.3σ) and WWZ (3.4σ) productions individually. Finally\, I will briefly discuss the future of the physics program of the rare multi-boson processe s. \; \;


    Contact Name: Sally Megonigal
    Contact E-Mail : \;smegonig@umd.edu \; \ ; LAST-MODIFIED:20200921T180157Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201214T210000Z DTEND:20201214T220000Z DTSTAMP:20260828T094430Z UID:5r1pd2gv8cvjiq2u9anj4kpeid@google.com CREATED:20200922T143120Z DESCRIPTION:

    Title: \;NMR of RNA – from methodologic al advances to the elucidation of functional RNA dynamcis

    Spe aker: \;Christoph Kreutz\, University of Innsbruck Austria

    Abstract: \;

    In the seminar I will introduce our recent additions to advance the stable isotope (SI) labeling procedures for nucleic acids and how we use these tailor made SI labeled RNAs and DNA s in NMR spectroscopic applications. As a recent example the 19F13C-aromati c labeling of RNA nucleobases to unlock the TROSY effect in RNA will be pre sented. The high potential to study complex nucleic acid systems by the inc orporation of atom-specific 13C and 15N labeled residues will be highlighte d. In detail\, the simplification of NMR spectra of the 61 nt group II doma in 6 RNA in slow exchange on the NMR chemical shift time scale will be show cased. The residue-specific isotope labeling also allowed to characterize t he kinetic signature of the slow exchange process and to get unprecedented insights into the catalytic mechanism of the group II intron. Furthermore\, a direct and robust approach to introduce radical PROXYL/TEMPO tags into l arger RNAs will be presented allowing paramagnetic relaxation enhancement ( PRE) NMR. A procedure for TEMPO labeling of a miRNA viral RNA complex will be presented.


    Join Zoom Meeting
    https://umd.zoom. us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889


    LAST-MODIFIED:20201130T175207Z LOCATION:Online seminar -- Zoom meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181211T160000 DTEND;TZID=America/New_York:20181211T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181211T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Mark Wilson\, Physics Today\n\nTitle: Science Journa lism: Reporting and Writing for Physics LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200210T213000Z DTEND:20200210T223000Z DTSTAMP:20260828T094430Z UID:5csnuhnubvva72334cvpve4ee8@google.com CREATED:20200129T222414Z DESCRIPTION:Title: \;Acceleration of cosmic rays in magnetic circumstel lar bubbles

    Speaker: Vladimir S. Ptuskin\, IZMIRAN\, Russia

    A bstract: We consider the diffusive shock acceleration in interstellar bubbl es created by powerful stellar winds of supernova progenitors. Under the mo derate stellar wind magnetization\, the bubbles are filled by the strongly magnetized low-density gas. It is shown that the maximum energy of particle s accelerated by a supernova shock moving across the azimuthal magnetic fie ld in this environment can exceed the "knee" in the cosmic ray energy spect rum observed \;at ~ 3 x 1015 \;eV. \;The relevant co smic-ray and gamma-ray data are discussed.

    Notes: Coffee\, tea and s nacks 4:15 - 4:30PM LAST-MODIFIED:20200129T222651Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200218T181500Z DTEND:20200218T191500Z DTSTAMP:20260828T094430Z UID:6v34r2t8k75ng69vapjnahrles@google.com CREATED:20200122T135550Z DESCRIPTION:Speaker: Dr. Nicole Yunger Halpern\, Harvard University\, ITAMP

    Title: Learning About Learning By Many-Body Systems

    Abstract : \;Far-from-equilibrium many-body systems\, from soap bubbles to suspe nsions to polymers\, learn the drives that push them. This learning has bee n characterized with thermodynamic properties\, such as work dissipation an d strain. We move beyond these macroscopic properties that were first defin ed for equilibrium contexts: We quantify statistical mechanical learning wi th machine learning. Our strategy relies on a parallel that we identify bet ween representation learning (a machine-learning model) and statistical mec hanics in the presence of a drive. We apply this parallel to measure classi fication ability\, memory capacity\, discrimination ability\, and novelty d etection. Numerical simulations of a spin glass illustrate our technique. T his toolkit exposes self-organization that eludes detection by thermodynami c measures. Our toolkit more reliably and more precisely identifies and qua ntifies learning by matter.

    Reference: Zhong\, Gold\, Marzen\ , England\, and NYH\, \;arXi v:2001.03623 \;(2020). LAST-MODIFIED:20200206T134829Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190401T170000Z DTEND:20190401T180000Z DTSTAMP:20260828T094430Z UID:71mdj4b613cl8d3gdmref57t6l@google.com CREATED:20190225T125450Z DESCRIPTION:Speaker: Oles Shtanko\n\n\n\nInstitution: MIT\n\n\n In quantum transport problems\, thermal environment plays an important role. We demons trate that additionally to suppressing quantum transport due to dephasing\, the environment is able to induce new dynamic effects absent in an isolate d system. In particular\, we show that non-interacting particles in presenc e of stochastic environment may exhibit formation of vortices and Poiseuill e flow\, the effects similar to commonly considered signatures of hydrodyna mic behavior. We provide a detailed analysis of the phenomenon and derive t he equations for quasi-viscous flow. The environmentally induced quantum qu asi-viscosity suggests new possible transport regimes accessible in solid-s tate devices\, cold atomic systems\, and photonic quantum simulators.\n\n\n Host: Mohammad Hafezi LAST-MODIFIED:20190225T125450Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161114T110000 DTEND;TZID=America/New_York:20161114T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161114T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Aephraim Steinberg\n\nSpeaker Institution: University of Toronto\n\nTitle: How to count one photon and get a(n average) result of 1000… (in binary)\n\nAbstract:I will present our recent experimental work using electromagnetically induced transparency in laser-cooled atoms to mea sure the nonlinear phase shift created by a single post-selected photon\, a nd its enhancement through "weak-value amplification." Put simply\, due to the striking effects of "post-selective" quantum measurements\, a (very un certain) measurement of photon number can yield an average value much large r than one\, even when it is carried out on a single photon. I will say a few words about possible practical applications of this "weak value amplifi cation" scheme\, and their limitations. \n\nTime permitting\, I will also d escribe other future and past work related to quantum metrology and ultraco ld atoms – in particular\, we have implemented a quantum-information-inspir ed protocol to beat “Rayleigh’s curse” for resolving closely-separated spot s in classical imaging\; and we have preliminary evidence of a narrow Fabry -Perot resonance for atoms.\n\nHosted by Mohammad Hafezi and Charles Clark. \n LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201020T171500Z DTEND:20201020T181500Z DTSTAMP:20260828T094430Z UID:26j34ekcclbfis2ibq8akvdbh1@google.com CREATED:20200923T160445Z LAST-MODIFIED:20200923T160445Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181003T150000Z DTEND:20181003T163000Z DTSTAMP:20260828T094430Z UID:0uc7c0k8mb82jsk8dlse11gepe@google.com CREATED:20180913T180247Z DESCRIPTION:Scrambling and complexity in phase space\n\nThe study of inform ation scrambling in many-body systems has sharpened our understanding of qu antum chaos. In this talk\, we will address the question of scrambling and operator complexity in continuous variable (CV) systems. Unlike their discr ete variable cousins\, continuous variable systems exhibit two complementar y domains of information scrambling: 1) scrambling in the phase space of a single mode and 2) scrambling across multiple modes of a many-body system. Moreover\, for each of these domains\, we identify two distinct "types" of scrambling\; strong scrambling\, where an initial operator localized in pha se space spreads out and weak scrambling\, where a local ensemble of operat ors distorts but the overall phase space volume remains fixed. To character ize these behaviors\, we introduce a CV out-of-time-order correlator (OTOC) based upon displacement operators\, which can be experimentally measured. Finally\, we offer a number of results regarding the CV analog for unitary designs\, enabling a complexity hierarchy for CV unitaries. Our work opens the door to experimentally probing phase space scrambling in CV systems\, s uch as cavity QED architectures. LAST-MODIFIED:20180924T185949Z LOCATION:PSC 3150: QuICS Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 3150: QuICS Seminar-Quntao Zhang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190326T150000Z DTEND:20190326T160000Z DTSTAMP:20260828T094430Z UID:2l8j0mvqtqr4ssr6lmmsr5p5vg@google.com CREATED:20190321T154337Z DESCRIPTION:\nTitle: 2D Magnetism and Novel Spintronic Devices \n\n\nSpeake r: Dr. Cheng Gong\, University of California\, Berkeley\n\nAbstract: Magnet ism\, one of the most fundamental physical properties\, has revolutionized significant technologies such as data storage and biomedical imaging\, and continues to bring forth new phenomena in emergent materials and device arc hitectures. The recently discovered magnetic 2D van der Waals materials (he reafter abbreviated as “2D magnets”) provide ideal platforms to enable the atomically-thin\, flexible\, lightweight magneto-optic and magnetoelectric devices. The seamless integration of 2D magnets with dissimilar electronic and photonic materials further opens up exciting possibilities for unpreced ented properties and functionalities. In this talk\, I will speak on our ex perimental observation of the 2D magnetism\, and show how we utilize such a tomically thin magnetic flatlands to develop novel spintronic devices such as low-power magnetoresistive memories\, high-efficiency spin field-effect transistors\, and quantum sensors. I will also highlight the promises of 2D magnetic heterostructures in the significant applications including quantu m computing/communication and energy harvesting/conversion. \n\n \nBio: Dr. Cheng Gong is a postdoc in the Nanoscale Science and Engineering Center\, University of California\, Berkeley. Before moving to California in 2014\, Dr. Gong did his Ph.D. in Materials Science and Engineering at University o f Texas at Dallas\, since 2008. Dr. Gong’s sustained contribution to the sc ientific field of low-dimensional materials and devices\, particularly incl uding his original contribution to the 2D magnetism and spintronics\, can b e found in his 17 first-authored publications in high-profile journals such as Nature\, Science\, Nature Electronics\, PNAS\, Nano Letters\, ACS Nano\ , etc. LAST-MODIFIED:20190321T154337Z LOCATION:AVW 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190903T160000 DTEND;TZID=America/New_York:20190903T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20190924T035959Z;BYDAY=TU EXDATE;TZID=America/New_York:20190903T160000 EXDATE;TZID=America/New_York:20190910T160000 DTSTAMP:20260828T094430Z UID:5og0is3rohgeori9q923a4kmrk@google.com CREATED:20190801T151326Z LAST-MODIFIED:20190830T173601Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190513T110000 DTEND;TZID=America/New_York:20190513T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190513T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Connecting quantum systems through optimized photonics\n \nSpeaker: Jelena Vuckovic\, Stanford\n\n\nAbstract: At the core of most qu antum technologies\, including quantum networks and quantum simulators\, is the development of homogeneous\, long lived qubits with excellent optical interfaces\, and the development of high efficiency and robust optical int erconnects for such qubits. To achieve this goal\, we have been studying co lor centers in diamond (SiV\, SnV) and silicon carbide (VSi in 4H SiC)\, in combination with novel fabrication techniques\, and relying on the powerfu l and fast photonics inverse design approach that we have developed.\n\nOur inverse design approach offers a powerful tool to implement classical and quantum photonic circuits with superior properties\, including robustness to errors in fabrication and temperature\, compact footprints\, novel funct ionalities\, and high efficiencies. We illustrate this with a number of dem onstrated devices in silicon\, diamond\, and silicon carbide\, including wa velength and polarization splitters and converters\, power splitters\, coup lers\, nonlinear optical isolators\, on chip laser driven particle accelera tors\, and efficient quantum emitter-photon interfaces for color centers in diamond and in SiC. We are also employing this approach to implement a qua ntum simulator based on color centers in semiconductors. LAST-MODIFIED:20190507T154200Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200204T181500Z DTEND:20200204T191500Z DTSTAMP:20260828T094430Z UID:0nq8cdq9i425lsh0rd3c95tqe8@google.com CREATED:20200122T132732Z DESCRIPTION:Speaker: Dr. Jack Douglas\, NIST

    Title: Cooperative Moti on and Structural Relaxation in Glass-Forming Materials

    Abstract: Co llective motion and relaxation in glass-forming polymeric liquids are inves tigated in molecular dynamics (MD) simulations of bulk polymer\, thin polym er film and nanocomposite materials. The physical arguments underlying the Adam-Gibbs (AG) model of glass-formation are summarized and we then test wh ether collective particle exchange motion exists as predicted by AG and whe ther this model can rationalize the highly variable temperature dependence of the structural relaxation time found in this broad family materials. We observe string-like excitations involving particles undergoing collective e xchange motion that we directly identify with with the abstract "cooperativ ely rearranging regions" of AG (see Refs. 1 - 3 for discussion). Further\, we verify this correspondence by \;quantitatively \;describi ng all our relaxation data based on our extended AG model (string model of glass-formation) and the empirically determed high tempearture Arrhe nius activation parameters of transition state theory. Finally\, we confirm the predicted inverse relation between the mass of the dynamic strings and the fluid configurational entropy that underlies the AG model. The implica tions of this model extend far beyond glass-forming polymer liquids\; we sh ow the same type of collective motion arises in grain boundaries of crystal line materials\, the interfaces of crystals\, the interfacial dynamics of n anoparticles\, superheated crystals\, and in biologically relevant material s such lipid membranes and the internal dynamics of proteins and arises in materials ranging from metallic glasses to polymer materials. Evidently\, s tring-like collective motion is relevant to understanding relaxation in div erse condensed materials.
    1) Francis W. Starr\, Jack F. Douglas\, and Sr ikanth Sastry\, "The relationship of dynamical heterogeneity to the Adam-Gi bbs and random first-order transition theories of glass formation" \;J. Chem. Phys. \;138\, 12A541 (2013).
    2) Beatr iz A. Pazmiño Betancourt\, Jack F. Douglas\, and Francis W. Starr\, "String model for the dynamics of glass-forming liquids" \;J. Chem. Phys. \;140\, 204509 (2014).
    3) Beatriz A. Pazmiño Bet ancourt\, Paul Z. Hanakata\, Francis W. Starr\, and Jack F. Douglas\, "Quan titative relations between cooperative motion\,emergent elasticity\, and fr ee volume in model glass-forming polymer materials" \;Proc. Natl. Ac ad. Sci. (USA)\, \;112\, 2966 (2015). LAST-MODIFIED:20200122T132732Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200925T170000Z DTEND:20200925T180000Z DTSTAMP:20260828T094430Z UID:1pvso7dvhr20hrhdptmknlrf3g@google.com CREATED:20200916T151551Z DESCRIPTION:Speaker: Christopher Wolverton\, MSE Professor\, Northwestern U niversity -http s://www.mccormick.northwestern.edu/research-faculty/directory/profiles/wolv erton-chris.html

    Title: TBA

    Abstract: TBA

    ZOOM: C ontact Sherri Tatum\, @statum12@umd.edu LAST-MODIFIED:20200917T152813Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200206T190000Z DTEND:20200206T200000Z DTSTAMP:20260828T094430Z UID:11n0rbal0gfltm9k94lvefk6f4@google.com CREATED:20200103T133449Z DESCRIPTION:Speaker: Joe Checkelsky\, MIT\nTitle: Synthesizing “Toy Model” Quantum Materials \nAbstract:\nConnecting theoretical models for exotic qu antum states to real materials is a key goal in quantum material synthesis. Among such theoretical models\, a “toy model” is one made deliberately sim plistic in order to demonstrate new physical concepts and their underlying mechanisms. We describe here our recent progress in experimentally realizi ng “toy model” quantum materials which\, in analogy to their theoretical co unterparts\, are designed to capture simple model systems by lattice and su perlattice design. First\, we discuss improvements in the realization of t he kagome lattice model in materials with reduced inter-kagome-layer coupli ng\, including observation of both the massless and infinitely massive elec tronic bands expected therein. Second\, we describe recent progress in rea lizing clean-limit 2D superconductivity in natural superlattice materials\, which potentially connect to models for finite-momentum pairing and topolo gical superconducting states. We comment on the perspective for realizing further toy model systems in complex material structures. \n\nHost: J. Pag lione\n\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20200108T211123Z LOCATION:Room 1201 of the John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Joe Checkelsky\, Massachusetts Institute of Technol ogy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200924T120000Z DTEND:20200924T130000Z DTSTAMP:20260828T094430Z UID:2c1bdmftrqchkr64kvcs9hnrgq@google.com CREATED:20200922T210557Z DESCRIPTION:Sankar Das Sarma \; has published another entry in hi s blog series on the #Covid_19< span> pandemic. This time\, he examines the plausibility of "herd immunity" both globally and locally. https://physics.umd.edu/cmtc/blog.html LAST-MODIFIED:20200922T210902Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:New CMTC Blog Post on COVID-19 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191210T160000Z DTEND:20191210T171500Z DTSTAMP:20260828T094430Z UID:44i2dil8247g9deastmt3minv5@google.com CREATED:20190829T204224Z DESCRIPTION:Title: Mimicking \;the edge of 2d topological superconductors and insulators in 1dlattice models

    Speaker: Max Met litski (MIT)

    Abstract: \;It is well known that the edge of a sym metry protected topological phase is anomalous\; in particular\, it cannot exist without the bulk if the symmetry is implemented in the standard "on-s ite" manner. In this talk\, I'll discuss how an unconventional symmetry rea lization can be used to mimick the edge of 2d topological insulators and su perconductors in local 1d lattice models. In the case of quantum spin-Hall insulators this requires using a symmetry action which \;is not ``on-si te." In the case of topological superconductors (class DIII) \; the ano maly is more severe and a constrained edge Hilbert space is required. In bo th cases\, we construct 1d Hamiltonians that realize the gapless edge theor ies: the helical Luttinger liquid and the Ising CFT.

    Condensed Matt er Theory Center website:
    http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20191203T135516Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200218T160000 DTEND;TZID=America/New_York:20200218T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200218T160000 CREATED:20190530T191015Z DESCRIPTION:Jeffrey I Mechanick Quantu m Biology Lecture

    Title: \;Quantum Tools for the Life Sci ences
    Ron Walsworth\, University of Maryland LAST-MODIFIED:20200214T202721Z LOCATION:1410 Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181210T180000Z DTEND:20181210T190000Z DTSTAMP:20260828T094430Z UID:6n181js6t8mt6n8osd5bhonh6v@google.com CREATED:20181130T170336Z DESCRIPTION:\nGuido Pupillo\, University of Strasbourg\n\nAlgebraic localiz ation of disordered long-range quantum models\n\nSeveral atomic\, molecular \, and optical systems\, as well as certain condensed matter models\, exhib it long-range interactions that decay with distance r as a power law 1/r^al pha. In this talk\, we will present recent results for the localization pro perties of correlation functions of these long-range quantum models in the presence of disorder. The latter is usually associated with exponential loc alization of wave functions and correlations. We demonstrate that in most s ituations in 1D power-law interactions imply algebraic decay of correlation s. We will discuss the generality of these results and their application to experiments in atomic and molecular physics. LAST-MODIFIED:20181130T170336Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190924T150000Z DTEND:20190924T161500Z DTSTAMP:20260828T094430Z UID:5i3qduskia61qg8qm0telamrut@google.com CREATED:20190829T193234Z DESCRIPTION:Title: Two theories of strange and bad metals

    Speaker: C onnie Mousatov (Stanford)

    Abstract: T-linear resistivity is ubiquito us in "strange metals"\, but has proven challenging for theory. I will desc ribe two electronic scattering mechanisms leading to T-linear resistivity. The first arises when well-defined `cold’ quasiparticles coexists with smal l pockets of `hot’\, classical electrons. A scattering of two cold electro ns into one cold and one hot leads to T-linear resistivity. I will argue th at this process explains\, in detail\, the phenomenology of the prototypica l strange metal Sr3Ru2O7. Secondly\, I will discuss transport in a Hubbard- like model that is solvable at weak hopping (t <\;<\; U\,T). This mecha nism is relevant for recent experiments in ultra cold atomic gases and poss ibly low bandwidth systems such as magic angle graphene.


    Condens ed Matter Theory Center website:
    http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20200927T132213Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201021T150000Z DTEND:20201021T160000Z DTSTAMP:20260828T094430Z UID:6lf8duqp221ohiknft5e9fgn60@google.com CREATED:20200923T161942Z DESCRIPTION:Speaker: Taylor Woehl\, UMD - \;http://chbe.umd.edu/clark/f aculty/343/Taylor-J-Woehl

    Title: TBA

    Abstract: TBA

    ZOO M: \;https://umd.zoom.us/j/92413882 709?pwd=Um9JZVhCeXlzK092TG81SmVZSm5Bdz09 LAST-MODIFIED:20200923T161942Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190329T160000Z DTEND:20190329T164000Z DTSTAMP:20260828T094430Z UID:6fha4dqvhjbv17io18i2b4r664@google.com CREATED:20190315T155204Z DESCRIPTION:\nTitle:Non-Markovian dynamics of collective atomic states\n\nS peaker: Kanupriya Sinha\, JQI and ARL\n\nAbstract: We study a system of neu tral two-level atoms prepared in a collective state coupled to an optical w aveguide\, particularly considering the regime where interatomic separation s are comparable to the coherence length of a spontaneously emitted photon in the waveguide mode. Considering the atomic system interacting with the q uantized electromagnetic field bath\, we find that there is a departure fro m the Markovian dynamics due to the retardation effects in the field propag ation and backaction of the bath on the system. We find that the non-Markov ian dynamics in such parameter regimes can exhibit several interesting effe cts such as a time-delayed feedback-induced enhancement and inhibition of t he collective spontaneous emission in addition to the usual Dicke super- an d sub-radiance. We further discuss the feasibility of observing these effec ts in ongoing experiments with atoms coupled to waveguides.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190321T013118Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191004T170000Z DTEND:20191004T180000Z DTSTAMP:20260828T094430Z UID:5ivvdpnga1g0i4l1b72tvluaf3@google.com CREATED:20190905T132851Z DESCRIPTION:Speaker: Dr. Asher C. Leff\, Research Scientist\, U.S. Army Res earch Laboratory\n\nTitle: Development and Utilization of Advanced Electron Microscopy Techniques for Unique Insight into Materials Fabrication\, Proc essing\, and Performance\n\nAbstract: Scanning and transmission electron mi croscopy are powerful tools for the characterization of materials that have been utilized for decades. Recently\, there have been significant developm ents in both the microscopes themselves and the detection and analysis tech niques that enhance their capabilities. In this talk\, Dr. Leff will discus s a survey of advanced electron microscopy techniques including precession electron diffraction\, Nye tensor dislocation density mapping\, direct elec tron detection-electron energy loss spectroscopy\, in situ heating\, deform ation\, and ion irradiation\, and spherical aberration correction. Each of these tools provide the ability to gain unique insights into material fabri cation\, processing\, and performance. Topics covered will include the evol ution of twin microstructures in Cu\, the nature of deformation in nanocrys talline Fe\, the formation of precipitates in Al-Mg and Ni-Ti alloys\, the evolution of radiation-induced defects in Fe and steel\, and MBE growth of III-V semiconductors. LAST-MODIFIED:20190905T132851Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190306T160000Z DTEND:20190306T171500Z DTSTAMP:20260828T094430Z UID:31qk2lq4nhf5u17t5ni3abj11c@google.com CREATED:20190304T183753Z DESCRIPTION:Privacy Amplification against Active Quantum Adversaries and Qu antum-Proof Non-Malleable Extractors\nSpeaker: Kai-Min Chung (Academia Sin ica) \nTime: Wednesday\, March 6\, 2019 - 11:00am \nLocation: PSC 3150 \n\n In privacy amplification\, two mutually trusted parties aim to amplify the secrecy of an initial shared secret X in order to establish a shared privat e key K by exchanging messages over an insecure communication channel. If t he channel\nis authenticated the task can be solved in a single round of co mmunication using a strong randomness extractor\; choosing a quantum-proof extractor allows one to establish security against quantum adversaries.\nIn the case that the channel is not authenticated\, this simple solution is n o longer secure. Nevertheless\, Dodis and Wichs (STOC'09) showed that the p roblem can be solved in two rounds of communication using a non-malleable e xtractor\, a \nstronger pseudo-random construction than a strong extractor. \nWe give the first construction of a non-malleable extractor that is secu re against quantum adversaries. The extractor is based on a construction by Li (FOCS'12) and is able to extract from source of min-entropy rates large r than 1/2. Combining \nthis construction with a quantum-proof variant of t he reduction of Dodis and Wichs\, due to Cohen and Vidick (unpublished) we obtain the first privacy amplification protocol secure against active quant um adversaries. LAST-MODIFIED:20190304T183753Z LOCATION:PSC 3150: QuICS Seminar-Kai-Min Chung SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 3150: QuICS Seminar-Kai-Min Chung TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190521T150000Z DTEND:20190521T201500Z DTSTAMP:20260828T094430Z UID:0h4sfmgo8k7rl884uhb7l9c8qh@google.com CREATED:20190509T205013Z DESCRIPTION:Schedule (LINK TO ABSTRACTS)

    11 :00AM Jay D. Sau "Theory of coherent phase modes in insulating Josephson j unction chains "

    11:45AM Fengcheng Wu "Phonon-induced giant linear- in-T resistivity and exotic superconductivity in twisted bilayer graphene"< br>
    2:00PM Tom Iadecola "Quantum Many-Body Scars and Space-Time Crystall ine Order from Magnon Condensation"

    2:45PM Danny Bulmash "Gauging f ractons: a new class of non-Abelian fracton models"

    3:30PM Ruixing Zhang "Higher order topology in iron-based superconductors"

    website: h ttps://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190520T000522Z LOCATION:CMTC Conference Room (2205 John S. Toll Physics Bldg.) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Spring Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200409T180000Z DTEND:20200409T190000Z DTSTAMP:20260828T094430Z UID:555h42sm7oivpq775sp5snpdeg@google.com CREATED:20200309T124315Z DESCRIPTION:Speaker:Ruixing Zhang\, University of Maryland\nTitle: "Majora na fermions could be just around the corner"\nAbstract: TBA LAST-MODIFIED:20200309T124315Z LOCATION:Room 1201 of the John S. Toll Building\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Ruixing Zhang\, University of Maryland TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190130T203000Z DTEND:20190130T213000Z DTSTAMP:20260828T094430Z UID:6snji9v6k2ieene6sevub3uipb@google.com CREATED:20190125T163004Z DESCRIPTION:Title : Role of stable modes in shear-flow turbulence\n\n\nSpea ker: Adrian Fraser\, University of Wisconsin \n\nAbstract : Sheared flows a re found in a variety of fusion and astrophysical systems\, where they may become unstable and drive turbulence. While the effects of physical\nparame ters on the underlying instability's threshold and growth rate are often we ll-understood\, in many cases their effect on the resulting turbulence is m uch less clear. I will discuss ongoing efforts towards understanding how th e Kelvin-Helmholtz (KH) instability\, the canonical shear flow instabiliy\, saturates and drives turbulence. Particularly\, I will discuss the role pl ayed by linearly stable (damped) modes\, which have been shown to be import ant in other fusion-relevant systems. Analytical calculations show that the se stable modes\, universally neglected in reduced KH models\, are in fact nonlinearly pumped to significant amplitudes in saturation. At these amplit udes\, they present a large-scale energy sink for turbulent fluctuations\, and can change the evolution of the mean flow. Additionally\, I will discus s gyrokinetic simulations of a driven\, KH-unstable flow\, where observatio ns of unstable and stable mode amplitudes in the fully-developed turbulent state have informed successful reduced models for how the mean flow scales with physical parameters. These findings have motivated ongoing work to use stable modes to help understand how KH saturation in MHD is affected by eq uilibrium magnetic fields. LAST-MODIFIED:20190125T163011Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200922T180000Z DTEND:20200922T190000Z DTSTAMP:20260828T094430Z UID:3ojniu8vq5dpm42qfg1r6l5uob@google.com CREATED:20200914T215058Z DESCRIPTION:
    A Virtual Fireside Chat with Nobel Laureate Bill Phil lips
    Curious about the buzz around quantum\, but don't really un der-stand what the big deal is? Want to understand how the quantum revoluti on applies to you but don’t have a background in physics?
    If so\, please join the Mid-Atlantic Quantum Alliance (MQA) for a fireside chat between U niversity of Maryland’s Vice President for Research\, Dr. Laurie Locascio\, and Nobel Laureate Dr. Bill Phillips. Dr. Phillips is a renowned science c ommunicator in addition to being a leading scientist\, and currently serves as a NIST Fellow and a University of Maryland Distinguished University Pro fessor.

    Webinar Registration: https://umd.zoom.us/webinar/register/W N_xdUBExYIRMKZohepGl48uw


    LAST-MODIFIED:20200914T215058Z LOCATION:Webinar Registration: https://umd.zoom.us/webinar/register/WN_xdUB ExYIRMKZohepGl48uw SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Basics for the Curious TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190311T110000 DTEND;TZID=America/New_York:20190311T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190311T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Interacting atoms in interesting lattices\n\nSpeaker: Da n Samper Kurn\, Berkeley\n\nAbstract: Atoms moving within the spatially per iodic potential generated by interfering plane waves of light can mimic the behavior of electrons that move within the spatially periodic potential wi thin a solid-state crystal. In this manner\, quantum gases can serve as an experimental quantum simulator for the physics models that are used to des cribe electronic materials. I will describe how one can use optical lattic es formed using two different colors of light to produce an array of period ic potentials with differing geometry – specifically\, two-dimensional latt ices with triangular unit cells – and then how interacts modify the correla tions of neutral bosonic atoms trapped within those potentials. I will sum marize two major experimental findings: a quantitative test of the Bose-Hub bard model achieved by comparing gases trapped in two different trapping ge ometries\, and a characterization of inversion-asymmetric spatial correlati ons in a trimerized (breathing) kagome lattice. I will conclude with sever al suggestions for future work. LAST-MODIFIED:20190305T012334Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190307T210000Z DTEND:20190307T223000Z DTSTAMP:20260828T094430Z UID:5t27ljoljlulpvjs0ql1f5naot@google.com CREATED:20190228T141816Z DESCRIPTION:Tuhin Roy\, Tata Institute \n\nTitle: Supersymmetry with an inh omogeneous S-term\n\nAbstract: \n\nIt is supposed to be a generic result th at the renormalization group equation of a particular combination of scalar superpartner masses (more popularly \nknown as the S-term) in models of el ectroweak supersymmetry is homogeneous\, and remains so irrespective of de tails of how supersymmetry is broken. \nThis term\, therefore\, is though t to be an interesting measure to probe far ultraviolet. In this talk\, I s how how this understanding breaks down and the result is not valid in the m ost general scenarios of softly broken supersymmetry. In the second half of the talk I will use this result to resurrect models of supersymmetry whic h are ruled out because of cosmological considerations. LAST-MODIFIED:20190305T140346Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191112T181500Z DTEND:20191112T191500Z DTSTAMP:20260828T094430Z UID:5a9dk5n7vgm0a84e8qnvnniout@google.com CREATED:20190910T141250Z LAST-MODIFIED:20190910T141250Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191121T123000 DTEND;TZID=America/New_York:20191121T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191121T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Cybersecurity Applications of Chaos\nSpeaker: Andrew Pom erance\nPotomac Research LLC\n\nAbstract: In this talk\, I will describe ex periments on a chaotic electronic circuit that can be used as a high speed true random number generator. This circuit can be modified to act as a Phys ically Unclonable Function\, which are novel cybersecurity devices used for device authentication\, tamper-proofing\, and key generation. LAST-MODIFIED:20191106T191821Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200324T160000 DTEND;TZID=America/New_York:20200324T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200324T160000 CREATED:20190530T191015Z DESCRIPTION:
     \; LAST-MODIFIED:20200318T200429Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED: Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190322T160000Z DTEND:20190322T164000Z DTSTAMP:20260828T094430Z UID:6c30sluid7bb7fpj3in66sjunt@google.com CREATED:20190321T012927Z DESCRIPTION:\nTitle: Validating and Certifying Stabilizer States\n\nSpeaker : Amir Kalev\, QuICS\n\nAbstract: I will discuss a measurement scheme that validates the preparation of n-qubit stabilizer states. The scheme involves a measurement of n Pauli observables\, a priori determined from the stabil izer state and which can be realized using single-qubit gates. Based on the proposed validation scheme\, we derive an explicit expression for the wors e-case fidelity\, i.e.\, the minimum fidelity between the stabilizer state and any other state consistent with the measured data. We also show that th e worse-case fidelity can be certified\, with high probability\, using O(n^ 2) copies of the state.\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm . LAST-MODIFIED:20190321T012927Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181029T193000Z DTEND:20181029T203000Z DTSTAMP:20260828T094430Z UID:2jvjf9kr8nm58v77lvbc4v07vl@google.com CREATED:20181024T134102Z DESCRIPTION:Title : A gyrokinetic model for the tokamak periphery\nSpeaker Name: Rogerio Jorge\nSpeaker Institution : Swiss Plasma Center - EPFL\n\nAb stract : We present a new gyrokinetic model that retains the fundamental el ements of the plasma dynamics at the tokamak periphery\, namely electromagn etic fluctuations at all scales\, comparable amplitudes of background and f luctuating components\, and a large range of collisionality regimes. Such m odel is derived within a gyrokinetic full-F approach\, describing distribut ion functions arbitrarily far from equilibrium\, and projecting the gyrokin etic equation onto a Hermite-Laguerre velocity space polynomial basis\, obt aining a gyrokinetic moment hierarchy. The treatment of arbitrary collision alities is performed by expressing the full Coulomb collision operator in g yrocentre phase space coordinates\, and providing a closed formula for its gyroaverage in terms of the gyrokinetic moments. In the electrostatic regim e and long-wavelength limit\, the novel gyrokinetic hierarchy reduces to a drift-kinetic moment hierarchy that in the high collisionality regime furth er reduces to an improved set of drift-reduced Braginskii equations\, which are widely used in scrape-off layer simulations. First insights on the lin ear modes described by our novel gyrokinetic model will be presented.\n\n\n swisdak@umd.edu LAST-MODIFIED:20181024T134102Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190205T160000Z DTEND:20190205T170000Z DTSTAMP:20260828T094430Z UID:7btnvo6mgalp5aat98u5c9oo2v@google.com CREATED:20190129T134303Z DESCRIPTION:Speaker: Wonpil Im - Assistant Professor\, Lehigh University\, Departments of Biological Sciences and Bioengineering\n\nTitle: Quantitativ e Characterization of Protein-Lipid Interactions\n\nAbstract: Understanding the delicate balance of forces governing protein-lipid interactions is cen tral to understanding the structure and function of biological membranes. T hese membrane constituent interactions play an essential role in determinin g the structure and function of membrane proteins\, and protein interaction s in membranes\, and thus form the basis for many vital processes\, includi ng transmembrane signaling\, transport of ions and small molecules\, energy transduction\, and cell-cell recognition. In this talk\, I will present ou r efforts toward quantitative characterization of protein-lipid interaction s based on free energy simulations. If time allows\, I will also present ot her research projects in my lab\, such as the CHARMM-GUI development\, a lo cal structure-centric bioinformatics\, and structure-based computational gl ycobiology. LAST-MODIFIED:20190129T142834Z LOCATION:Chem 0112 (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChePhys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181030T171500Z DTEND:20181030T181500Z DTSTAMP:20260828T094430Z UID:71ic8m17teia0ha3o1m9nulhpv@google.com CREATED:20180905T132623Z DESCRIPTION:Speaker: Juan Vanegas\, University of Vermont

    Title: Feeling the Force: Understanding Mechanosensation Through Local Stre ss Calculations and Steered Simulations


    Abstract: Numerous biological functions strongly depend on mechanically-driven pr ocesses including membrane fission and fusion\, mechanosensation\, cardiova scular control and development\, and osmotic regulation. Since the initial discovery of pressure-sensitive (membrane-stretch activated) channels in ba cteria\, numerous other mechanosensitive (MS) channels have come to light i ncluding the Piezo family\, as well as members of the two-pore domain potas sium (K2P) and transient receptor potential (TRP) families of channels. Und erstanding the functions of these proteins requires a multi-scale approach that can unravel the role that chemistry and molecular structure plays in t he meso- and macro-scale response to physical stimuli. A critical question in the field of mechanobiology is what are the molecular mechanisms by whic h MS proteins react to external forces? I will present our ongoing efforts to address this question through various molecular dynamics (MD) simulation methods. Focusing on the mechanosensitive channel of large conductance\, M scL\, I will show how 3D local stress calculations have allowed us to ident ify regions of high forces at the membrane-protein interface that play a ce ntral role in the mechanotransduction process under external stimuli such a s membrane stretch. We find that electrostatic interactions in these stress "hot spots" between positively charged amino acids and electronegative pho sphate oxygens result in tight lipid binding. We exploit the strength of th ese interactions to rapidly (few ns) and gently gate MscL in steered simula tions where pulling forces are directly applied to protein-bound lipids. In contrast\, achieving tension-induced gating of MscL in MD simulations with in nanoseconds is only possible under extreme conditions (>\;40 mN/m) lea ding to loss of membrane integrity and other artifacts. We have further gen eralized the accelerated method by means of a tension- mimicking collective variable (CV) that weights lipids depending on their lateral proximity to the channel through a smooth hyperbolic tangent stepping function. The CV m ethod is advantageous as it does not require excessive forces/strain on the membrane\, asymmetric stimuli can be probed by defining independent CVs fo r each leaflet\, and free energy surfaces can be readily obtained through m ethods such as metadynamics or umbrella sampling. We explore the structure and energetics of closed\, open and subconductive states of wild-type MscL as well as gain-of-function and loss-of-function mutants\, and compare to e xperimental observations. Our methods and results provide a path to underst and the force transduction mechanism in MscL and other related mechanosensi tive channels. \; \; LAST-MODIFIED:20181025T122040Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190711T190000Z DTEND:20190711T200000Z DTSTAMP:20260828T094430Z UID:6kcjlra4jhd9fg3p0g70holdln@google.com CREATED:20190703T130010Z DESCRIPTION:\nSpecial seminar by a post-doc candidate (Host: N.M. Linke)\n\ nThursday 07/11/2019 at 3pm in PSC 2136 \n\nWilliam Setzer\nWesleyan Univer sity\, Middletown\, CT\n\nTitle:\n"Spectra of Field-Ionized Rydberg States of H2 & Field Ionization Properties"\n\nAbstract:\nUnderstanding ionization properties of diatomic molecules is of fundamental importance to chemical physics and has many applications. Here\, I present the measured field ioni zation spectra of highly excited triplet H2 Rydberg states\, excited from t he v'' = 0\, N'' = 1−3 rovibrational levels of the metastable c-state in a 6 keV fast molecular beam. The spectra are analyzed and compared to results from multichannel quantum-defect theory (MQDT). Additionally\, the ionizat ion yields of N+=1 Rydberg states n=17-27 are characterized in static elect ric fields up to 36 kV/cm using a model which considers a diabatic traverse of the Stark map. Control over population-transfer observed in the experim ent between the N+=1 and N+=3 states of the ion core is demonstrated. LAST-MODIFIED:20190704T001545Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI special seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190220T210000Z DTEND:20190220T223000Z DTSTAMP:20260828T094430Z UID:5camhrf4iu5en31p9fk4uhfmk8@google.com CREATED:20190215T182336Z DESCRIPTION:Title : "Summary of the IAS Workshop on Future Colliders"\n\nSp eaker: Sarah Eno\, University of Maryland \n\nAbstract : In this talk\, I'l l show selected slides from the speakers at the IAS workshop in Hong Kong o n future colliders. Progress on the ILC\, FCCee\, FCChh\, HE-HLC\, HL-LHC\, CEPC\, CLIC and other collliders\, as presented by the speakers\, will be shown. LAST-MODIFIED:20190215T182343Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T203000Z DTEND:20181114T213000Z DTSTAMP:20260828T094430Z UID:copjgc9n74rjcb9pc8rm4b9kc9i62bb160r34b9mcco38cho6goj2d9gc8@google.com CREATED:20181109T173029Z DESCRIPTION:Title : The Role of Reconnection in Magnetic Self-Organization and Catastrophic Energy Release in the Solar Corona\nSpeaker Name: Joel Dah lin\nSpeaker Institution : Goddard Space Flight Center\nNotes: \nAbstract : Explosive solar activity in the form of coronal mass ejections and eruptiv e flares is generally agreed to be powered by the explosive ejection of hig hly stressed coronal magnetic fields. Magnetic reconnection has long been u nderstood to be the primary driver for the explosive energy release. Howeve r\, recent studies suggest that reconnection may also play an important rol e in both the formation and destabilization of the pre-eruptive field. We r eport on new 3D MHD numerical simulations that definitively demonstrate thr ee distinct roles of reconnection in the evolution of an eruptive flare. Th e initial configuration consists of a current-free (potential) magnetic fie ld with a coronal null point\, and energy and helicity are injected into th e corona via small-scale surface flows. A reconnection-mediated inverse hel icity cascade concentrates highly sheared magnetic fields above photospheri c reversals in the radial magnetic field. The resulting localized magnetic pressure deforms the coronal null point into a current sheet that eventuall y reconnects\, destabilizing quasi-static force balance by removing restrai ning tension. The configuration expands outward slowly\, stretching the mag netic field lines to form a flare current sheet. Onset of fast reconnection at this sheet expels the accumulated shear and drives rapid energy release . These results have important implications for magnetic self-organization and catastrophe in astrophysical plasmas. LAST-MODIFIED:20181112T183900Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190509T180000Z DTEND:20190509T193000Z DTSTAMP:20260828T094430Z UID:2sv3j2hum41vhpmaob8m1thr75@google.com CREATED:20190501T204522Z DESCRIPTION:\nSpeaker: James Williams\, UMD\nTitle: Phase Sensitive Investi gations of Two-Band Superconductors \nAbstract: \nThe BCS description of su perconductivity deals with superconducting order induced on a single band. Under certain conditions\, a simple addition of another superconducting ban d — a two-band superconductor (TBS) — can open the door to a plethora of ph ysical phenomena like exotic collective excitations\, novel topological sup erconductivity and superconductivity in the presence of broken time-reversa l symmetry. Yet probing the unique order parameters in TBSs has proven dif ficult. In this talk I will show how the Josephson effect can be used to in vestigate order parameters in TBSs and will highlight some of the interesti ng phenomena we have observed in two systems belonging to this class of mat erials: NbSe2 and SnTe.\nHost: Local\nRefreshments 1:30pm John S Toll Physi cs Bldg Room 1117 LAST-MODIFIED:20190502T185433Z LOCATION:Room 1201 John S Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: James Williams\, UMD TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200904T140000 DTEND;TZID=America/New_York:20200904T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201206T045959Z;BYDAY=FR EXDATE;TZID=America/New_York:20201127T140000 EXDATE;TZID=America/New_York:20201030T140000 EXDATE;TZID=America/New_York:20201113T140000 EXDATE;TZID=America/New_York:20201009T140000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com CREATED:20200827T172634Z DESCRIPTION:Speaker: David Radice\, Penn State University

    Seminar wi ll be conducted via zoom: \;Zoom Link

    Title: Neutron s tar merger dynamics

    Abstract: What is the nature of neutron stars? W here are r-process elements formed in the
    Universe? Multimessenger obser vations of neutron star mergers might provide us
    with the key to answer these and other important open questions in nuclear
    astrophysics. Howeve r\, multimessenger astronomy also poses new challenges to
    the theorists who need to develop models for the joint interpretation of all
    data chan nels. In this talk\, I will review our current theoretical
    understanding of how neutron star mergers proceed and of how the dynamics is
    imprinte d in their multimessenger emissions. I will present recent simulation
    re sults and their implications. Finally\, I will discuss future challenges an d
    prospective for this field. LAST-MODIFIED:20200827T172634Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191104T200000Z DTEND:20191104T213000Z DTSTAMP:20260828T094430Z UID:3vg0jkpeppck17ggat7rmotk7c@google.com CREATED:20190729T151322Z DESCRIPTION:Speaker: Ryan Janish\, UC Berkeley\n\nTitle: Fundamental Physic s with Supernovae and Superconductors\n\nAbstract: In the first part of thi s talk I will describe how type 1a supernovae (SN) can be used to constrain the interactions of heavy dark matter (DM)\, which may heat a white dwarf (WD) sufficient to trigger runaway fusion and ignite a SN. Based on the exi stence of long-lived WDs and the observed supernovae rate\, we constrain ul tra-heavy DM candidates that produce high energy SM particles in a WD. This rules out supersymmetric Q-ball DM in parameter space complementary to ter restrial bounds. We also constrain DM which is captured by WDs and forms a self-gravitating DM core. Such a core may form a black hole that ignites a SN via Hawking radiation\, or which causes ignition via a burst of annihila tion during gravitational collapse. It is intriguing that these DM-induced ignition scenarios provide an alternative mechanism of triggering SN from s ub-Chandrasekhar mass progenitors. In the second part of the talk\, I will present a new technique which utilizes superconducting RF cavities to signi ficantly improve the sensitivity of "light shinning through walls" searches for axion-like particles (ALPs). Our design uses a gapped toroid to confin e the static magnetic field responsible for axion-photon conversion\, and t hereby prevent quenching of the superconducting cavities . Such a search ha s the potential to probe axion-photon couplings to g ~ 2 x 10^-11 GeV^-1\, comparable to future optical and solar searches LAST-MODIFIED:20191104T195416Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200211T160000 DTEND;TZID=America/New_York:20200211T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200211T160000 CREATED:20190530T191015Z DESCRIPTION:\nDaniel Harlow\, MIT\n\nTitle: Symmetries in quantum field the ory and quantum gravity\n\nAbstract: Symmetry is one of the essential aspec ts of physics\, but there is an old set of conjecture restricting the kinds of symmetry that are possible in a theory of quantum gravity: there can be no global symmetries\, gauge symmetries can exist but only if there are dy namical objects that carry all possible charges\, and any gauge groups must be compact. I will show that all three of these conjectures hold within o ur best-understood theory of quantum gravity\, the "AdS/CFT correspondence" . This will require a general discussion of what is meant by global and ga uge symmetries\, and I will also comment on various possible phenomenologic al applications of these ideas. This talk is based on recent work with Hir osi Ooguri. \n\nHosted by Raman Sundrum LAST-MODIFIED:20200207T210459Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181128T203000Z DTEND:20181128T213000Z DTSTAMP:20260828T094430Z UID:3im2jpt3nnactb26bmqdp6pqdp@google.com CREATED:20181120T203631Z DESCRIPTION:Title : A boundary integral solver for computing force-free fie lds in stellarators\n\n\nSpeaker Name: Dhairya Malhotra\, Courant Institute \, New York University \n\nAbstract : We present a new boundary integral eq uation solver for computing force-free fields (Taylor relaxed states) in to roidal geometries. Such fields can be used to compute magneto-hydrodynamic (MHD) stepped pressure profile equilibria in magnetically confined plasmas in tokamaks and stellarators. Our method uses the generalized Debye source formulation for the time-harmonic Maxwell's equations\, which results in a well-conditioned second-kind boundary integral equations. Compared to tradi tional methods\, which require discretization of the entire volume\, our me thod requires significantly fewer unknowns since we only discretize the bou ndary and this results in significant savings in work. However\, the comput ation of the boundary integral operator requires efficient high-order quadr atures for singular and near singular integrals on complex three-dimensiona l surfaces. We will discuss fast algorithms for such quadratures. We will p resent numerical results to show accuracy\, efficiency and scalability of o ur method for several challenging geometries. We will also show preliminary results for computing stepped pressure profile equilibria using our solver . LAST-MODIFIED:20181120T203631Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200127T110000 DTEND;TZID=America/New_York:20200127T120000 RRULE:FREQ=WEEKLY;UNTIL=20200413T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20200217T110000 EXDATE;TZID=America/New_York:20200316T110000 EXDATE;TZID=America/New_York:20200330T110000 EXDATE;TZID=America/New_York:20200406T110000 EXDATE;TZID=America/New_York:20200323T110000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com CREATED:20191125T175528Z DESCRIPTION:Title: \n\nSpeaker:\n\nAbstract: LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190205T181500Z DTEND:20190205T191500Z DTSTAMP:20260828T094430Z UID:6i03gu6n3qnh1u8qbkat9uktb7@google.com CREATED:20190124T134103Z DESCRIPTION:Speaker: Professor Amish Patel\, University of Pennsylvania

    Title: Emergent Behavior of Soft Nanostructured Interfaces

    Abstract: Surfaces that display chemical or topographical heterogeneity a t the nanoscale are ubiquitous in diverse nanomaterial and biomolecular con texts. Liquid molecules at such soft interfaces have properties that differ from their bulk counterparts\; these differences can\, in turn\, lead to n ovel emergent properties\, such as the exquisite specificity with which cer tain biomolecules recognize one another\, or the remarkable disappearance o f contact angle hysteresis on textured hydrophobic surfaces. Although recen t advances in non-linear spectroscopy and molecular simulations have made i t possible to characterize the structural and dynamical properties of inter facial molecules\, identifying the salient characteristics of the interfaci al molecules that directly influence the emergent interfacial properties re mains challenging. My research group seeks to address this challenge by dev eloping novel enhanced sampling methods that provide access to the free ene rgy landscapes governing the behavior of liquid molecules in the vicinity o f soft nanostructured surfaces. An understanding of such landscapes then en ables us to guide the design new materials and molecules with unique emerge nt properties. I will illustrate this approach by addressing questions\, su ch as: Is it possible to design textured surfaces capable of recovering the ir superhydrophobicity? Do polymers undergo collective coil-to-globule tran sitions in good solvents? How do certain surfaces preferentially bind ice i n a vast excess of water? What is the chemical composition of superhydrophi lic surfaces that have strong preferential interactions with water? LAST-MODIFIED:20190130T153332Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191003T150000Z DTEND:20191003T160000Z DTSTAMP:20260828T094430Z UID:5osc7i7j033cdbmoiaq4poq0k0@google.com CREATED:20190930T145434Z DESCRIPTION:Speaker: Professor Xiaodong Michael Shi\, University South Flor ida\n\nTitle: Curiosity Driven Discovery of New Reactivity\n\nAbstract: TBA LAST-MODIFIED:20190930T145434Z LOCATION:Room 0112\, Marker Seminar Room \, Chemistry Bldg. #091 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chemistry and Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190417T180000Z DTEND:20190417T193000Z DTSTAMP:20260828T094430Z UID:51t81j7os00k75mv7mli72715n@google.com CREATED:20190129T151646Z DESCRIPTION:Jacquelyn Norona-Hostler\, Rutgers\n\nTitle: Locating the Quant um Chromodynamic Critical Point\n\nAbstract: Strongly interacting matter un dergoes a crossover phase transition at high temperatures T ∼ 10^12 K and z ero net-baryon density. A fundamental question in the theory of strong inte ractions\, Quantum Chromodynamics (QCD)\, is whether a hot and dense system of quarks and gluons displays critical phenomena when doped with more quar ks than antiquarks\, where net-baryon number fluctuations diverge. Recent l attice QCD work indicates that such a critical point can only occur in the baryon dense regime of the theory\, which defies a description from first p rinciples calculations due to the Fermi sign problem. In this talk\, the la test Lattice QCD efforts to find the QCD critical point will be discussed i n the context of the interplay between strange and light flavors in the cro ssover section of the phase diagram. In the baryon dense regime where Latti ce QCD results are not yet available I will show how the holographic corres pondence can be used to map the fluctuations of baryon charge in the dense quark-gluon liquid onto a numerically tractable gravitational problem invol ving the charge fluctuations of holographic black holes. LAST-MODIFIED:20190404T132546Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190226T160000 DTEND;TZID=America/New_York:20190226T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190226T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Geoff Greene\, University of Tennessee and Oak Ridge\n \nTitle: The Neutron Lifetime “Problem”\n\nAbstract: Within a nucleus\, the neutron may be unconditionally stable. However\, when liberated from a nuc leus\, the neutron is unstable and beta decays with a lifetime of approxima tely 10 minutes. Since neutron decay is the simplest example of nuclear bet a decay\, the value of the neutron lifetime is a parameter of considerable importance to a wide variety of physical systems. These range from astrophy sics to particle physics to cosmology. Particularly noteworthy is role play ed by the neutron lifetime in the Big Bang where it sets the time scale for nucleosynthesis and thus determines the cosmic abundance distribution of l ight elements. Given the interest in the neutron lifetime\, it is somewhat distressing to observe that the measurements of the neutron lifetime havin g the lowest quoted uncertainties are in substantial disagreement with one another. After a brief overview\, I will discuss this “neutron lifetime pro blem\,” outline the experimental landscape\, and conclude with the prospect s for future experiments. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200213T190000Z DTEND:20200213T200000Z DTSTAMP:20260828T094430Z UID:0ln9sk0ekq43103bfdqa3pr40a@google.com CREATED:20191212T173812Z DESCRIPTION:Speaker: Alon Ron\, Caltech \;
    Title: \;Ultrafast en hancement of exchange interaction and short range spin correlations probed by magnetoelastic coupling in CrSiTe3 \; \;
    Abstract: \;

    Interactions between electrons in solids are responsible for a wide vari ety of physical phenomena such as magnetism\, superconductivity Mott insula tors and more. Understanding interactions between electrons\, and manipulat ing them to stabilize desired electronic phases have been the research focu s of the strongly correlated electrons community in the past few decades. U ltrafast optics is a unique experimental platform where strong ultrashort p ulses of light can be used both to probe a multitude of electronic phenomen a\, and to excite and manipulate the properties of the electronic system\, driving it away from its equilibrium state. In this talk I will show how ul trafast optical techniques can be used to probe short range spin correlatio ns and modify magnetic interactions in a 2D layered ferromagnet. CrSiTe3 is composed of weakly bonded sheets of ferromagnetically interacting Heisenbe rg spins that\, in isolation\, would be impeded from long range order by th e Mermin-Wagner theorem. I will show that CrSiTe3 evades this law via a two -step crossover from two- to three-dimensional magnetic short range order a bove its Curie temperature (Tc = 31 K)\, manifested through two previously undetected totally symmetric distortions at T2D ~ 110 K and T3D ~ 60 K serv ing as a direct probe for measuring intarlayer and interlayer short range s pin correlations. Having understood the interplay between short range corre lations and the magneto-elastic distortions I will show how optically induc ed charge transfer could be used to enhance the magnetic super-exchange int eraction and how this manipulation can be detected by phase resolved spectr oscopy of coherent phonons.

    Host: Takeuchi


    Refreshments 1:30p m John S Toll Physics Bldg Room 1117
    Please bring a reusable mug! LAST-MODIFIED:20200129T210737Z LOCATION:Room 1201 of the John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Alon Ron\, Caltech TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201001T120000Z DTEND:20201001T130000Z DTSTAMP:20260828T094430Z UID:1olgvblaamnp34br4e9jqp234o@google.com CREATED:20200930T192425Z DESCRIPTION:Just posted: Sankar Das Sarma's new essay on the possibility of life "post-covid"\, what this will look like and if we can expect it anyti me soon: \; https://condensedmattertheo rycenterblog.wordpress.com/2020/09/29/postscript-and-post-covid/< /a>" LAST-MODIFIED:20200930T192425Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Postscript and Post-covid TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200928T203000Z DTEND:20200928T213000Z DTSTAMP:20260828T094430Z UID:05tqm3jhp88nqqoduoetdhqthf@google.com CREATED:20200806T060609Z DESCRIPTION:Title: \;On the Role of Shocks in Understanding Solar and H eliospheric Phenomena

    Speaker: Nat Gopalswamy\, Solar Physics Labora tory\, NASA Goddard Space Flight Center

    Abstract: Fast-mode MHD shoc ks were inferred from radio bursts from the Sun and from geomagnetic storm sudden commencement (SSC) more than six decades ago. Now we know that they are key players in Sun-Earth connection: they produce large solar energetic particle events and energetic storm particle events\, cause SSC/sudden imp ulse compressing the magnetosphere\, causing the onset of geomagnetically i nduced currents\, contributing to energetic particles in the Earth's magnet osphere\, and even modifying the atmospheric chemistry. Shocks are now obse rved throughout the heliosphere by remote-sensing and in-situ observations. This talk will address some of the recent achievements in understanding so lar and heliospheric phenomena involving shocks. In particular\, I will use the large data base on type II radio bursts observed by the Radio and Plas ma Wave (WAVES) experiment onboard the Wind spacecraft and the simultaneous ly available coronal mass ejection (CME) data from the Solar and Heliospher ic Observatory (SOHO) mission over the past quarter century. I will address the relation to SEP events\, which have led to the understanding of when w here the highest-energy particles are accelerated. I will also touch upon t he new result that the large-scale nature of the interplanetary shocks may be the source of high-energy (>\;100 MeV) gamma-rays lasting for hours be yond the end of the associated solar flares.

    Register at     https://bit.ly/2PmJoT6 LAST-MODIFIED:20200806T060609Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191114T160000Z DTEND:20191114T173000Z DTSTAMP:20260828T094430Z UID:02ac08bml17adgud43eigegou8@google.com CREATED:20190820T190814Z DESCRIPTION:Speaker: Roxanne Springer\, Duke University \n\nTitle: Large Nc constraints on pionless EFT: a low-energy few-nucleon window\ninto QCD.\n\ nAbstract:\nI will apply the ideas of large Nc and effective field theories to few nucleon systems. In the limit of a large number (Nc) of colors an e nhanced symmetry of QCD emerges. This symmetry has been used to understand properties of hadrons and nuclei. It has also been used to reduce the numb er of unknown parameters in effective field theories for few nucleon system s. I will discuss some of these applications and introduce a ``short cut" t hat occasionally applies. LAST-MODIFIED:20191108T183349Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200414T171500Z DTEND:20200414T181500Z DTSTAMP:20260828T094430Z UID:2ckedl9cmrpar9u1i7qn4fthgq@google.com CREATED:20200122T141251Z DESCRIPTION:Speaker: Mr. Nils Strand\, Northwestern University\n\nTitle: Cu rrent Inversion in a Periodically Driven Two-Dimensional Brownian Ratchet\n \nAbstract: TBA LAST-MODIFIED:20200217T141907Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201110T181500Z DTEND:20201110T191500Z DTSTAMP:20260828T094430Z UID:4ioii912uqda2lhlo7rugnp8je@google.com CREATED:20200923T160906Z DESCRIPTION:Speaker: Alex Alemi\, Google Research

    Title: \;Machi ne Learning and Thermodynamics \; \;

    Abstract: Much of moder n machine learning can be formulated as generalized information bottleneck style objectives. \; Unlike most approaches this gives a family of solu tions that let you explore the tradeoffs between various aspects of your mo del. \; These objectives are also formally equivalent to thermodynamics . This leads to interesting analogies and even more interesting research qu estions. \; In this talk\, I'll discuss some of the applications we've worked out so far.
    ZOOM: \;    https://umd.zoom.us/j/96201139851?p wd=VHZxdUFVT2NUc29lUmpmK05kcklwdz09 LAST-MODIFIED:20201103T144524Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201127T180000Z DTEND:20201127T190000Z DTSTAMP:20260828T094430Z UID:7dn9ovrsokfg6dvpkh1f1v49nj@google.com CREATED:20200923T165823Z LAST-MODIFIED:20200923T165835Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering - NO SEMINAR - THANKSGIVING HOLIDAY TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181107T160000Z DTEND:20181107T173000Z DTSTAMP:20260828T094430Z UID:67ietuipph39h52v9ggoeboe6p@google.com CREATED:20181023T115615Z DESCRIPTION:Quantum proof systems for iterated exponential time\, and beyon d\nQuICS Seminar\nSpeaker: \nHenry Yuen (University of Toronto)\nTime: \nWe dnesday\, November 7\, 2018 - 11:00am\nLocation: \nPSC 1136\nAn outstanding open question in quantum information theory concerns the computational com plexity of nonlocal games. in a nonlocal game\, a classical verifier intera cts with multiple players that cannot communicate\, but are allowed to shar e entanglement. In a recent breakthrough result\, Slofstra showed that the following problem is undecidable: given a nonlocal game\, is there a quantu m strategy for the players to win with probability 1?\n\nIn this work\, we show that even the approximation problem for nonlocal games is extremely di fficult. We prove that approximating the maximum winning probability to wit hin additive error 1/f(n) is as hard as any problem solvable in time 2^O(f (n))\, even using nondeterministic resources. Here\, n is the size of the g ame\, and f(n) is an arbitrary (time-constructible) function\, such as an i terated exponential function. By contrast\, the maximum winning probability for games with classical players can be exactly computed in nondeterminist ic exp(n) time. The high complexity of nonlocal games arises from the abili ty to encode arbitrarily complex computations into entangled states. \n\nI will discuss some consequences of our result: (1) we give an alternate proo f of Slofstra's undecidability result\; (2) we present polynomial-size quan tum proof systems for nondeterministic 2^O(f (n)) time with completeness-so undness gap 1/f(n) for arbitrary f(n)\, and (3) we show that seemingly mino r quantitative improvements to our result would provide a negative resoluti on to a multipartite version of Tsirelson's problem on the relation between the commuting operator and tensor product models for quantum correlations. \n\nJoint work with Joe Fitzsimons\, Zhengfeng Ji\, and Thomas Vidick. LAST-MODIFIED:20181023T120022Z LOCATION:PSC1136: QuICS Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 1136: QuICS Seminar-Henry Yuen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181106T160000Z DTEND:20181106T171500Z DTSTAMP:20260828T094430Z UID:7d580j5nikncvjvde80t8pigkt@google.com CREATED:20180828T221737Z DESCRIPTION:Speaker: Dmitry Abanin (University of Geneva)

    Title: Quantum many-body scars: a new form of ergodicity breaking in a
    R ydberg-atom quantum simulator

    Abstract: The thermodynamic descri ption of many-particle systems rests on the
    assumption of ergodicity\, t he ability of a system to explore all
    allowed configurations in the phas e space. Recent studies of many-body
    localization have revealed the exis tence of systems that strongly
    violate ergodicity in the presence of que nched disorder. Here\, we
    demonstrate that ergodicity can be weakly brok en by a different
    mechanism\, arising from the presence of special eigen states in the
    many-body spectrum that are reminiscent of quantum scars i n chaotic
    non-interacting systems. In the single-particle case\, quantum scars
    correspond to wave functions that concentrate in the vicinity of< br>unstable periodic classical trajectories. We show that many-body scarsappear in the Fibonacci chain\, a model with a constrained local
    Hilbe rt space that has been recently experimentally realized in a
    Rydberg-ato m quantum simulator. The quantum scarred eigenstates are
    embedded throug hout the otherwise ergodic many-body spectrum\, but lead
    to direct exper imental signatures\, as we show for periodic recurrences
    that reproduce those observed in the experiment. Our results suggest
    that scarred many- body bands give rise to a new universality class of
    quantum dynamics\, o pening up opportunities for the creation of novel
    states with long-lived coherence in systems that are now
    experimentally realizable.

    Hos t: Jay Sau

    Condensed Matter Theory Center website:
    http://www.physic s.umd.edu/cmtc/seminars.html LAST-MODIFIED:20181031T175901Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181102T170000Z DTEND:20181102T180000Z DTSTAMP:20260828T094430Z UID:5n90m4og1kgqst3igasctjgibb@google.com CREATED:20180905T153105Z DESCRIPTION:Speaker: Rajratan Basu\, Associate Professor\, Dept. of Phys ics\, U.S. Naval Academy\, Annapolis

    Title: 2D Hexagonal Nano materials-Based Liquid Crystals Devices

    Abstract: The planar-alignment agent in an electro-optic liquid crystal (LC) device p lays an essential role for the LC’s electro-optical characteristics. Rubbed polyimide (PI) layers are conventionally used as the planar-alignment agen t in traditional liquid crystal displays (LCDs). I will present our recent experimental results to show that 2D hexagonal nanosheets\, such as hexagon al boron nitride (h-BN) and graphene (GP) can serve as the planar-alignment agent in an LC cell. These 2D h-BN and GP nanosheets have higher chemical stability and more optical transparency than the PI layer. Also\, GP’s elec trical conductivity can be utilized to replace the transparent indium tin o xide (ITO) electrodes in the LC device. I will show that the 2D GP nanoshee t can be employed simultaneously as the electrodes and the planar-alignment agent in the LC cell. These 2D nanosheet-based LC cells show improvements in the ion-concentration\, optical transmittance\, and LC switching times\, which may have potential applications in the LCD industries. LAST-MODIFIED:20181025T122351Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181018T170000Z DTEND:20181018T183000Z DTSTAMP:20260828T094430Z UID:096s28dlima3hnige3q1f57sva@google.com CREATED:20180904T134930Z DESCRIPTION:\nTitle: Pseudo Parton Distributions from Lattice QCD\n\nSpeake r: Joseph Karpie\, College of William and Mary\n\nAbstract: Parton Distribu tion Functions (PDFs) are important objects\nfor interpreting the hadronic scattering experiments in terms of the\nStandard Model particles. PDFs are used to relate hadron degrees of\nfreedom and parton degrees of freedom and by definition cannot be\ncalculated in perturbation theory. In recent year s\, there have been\nmany proposals of how to extract PDFs from lattice cal culable matrix\nelements. Pseudo-PDFs and Good Lattice Cross Sections are t wo such\nmethods involving matrix elements of space-like separated fields.\ nAnalogous to phenomenological PDF extraction from experimental cross\nsect ions\, these matrix elements can be factorized into hard partonic\nparts an d PDFs. I will show a lattice calculation of these matrix\nelements and the methods being developed to extract the PDF from these\ncalculations. LAST-MODIFIED:20181011T153343Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181101T170000Z DTEND:20181101T180000Z DTSTAMP:20260828T094430Z UID:1h4u74i3fnq70g61b554cuuupr@google.com CREATED:20181026T161907Z DESCRIPTION:Title: Entanglement in mixed states of fermions \n\nHassan Shap ourian\, University of Chicago\n\nAbstract: Deciding whether a bipartite mi xed state is separable (unentangled) or not is a computationally intractabl e (NP-hard) problem. In the case of qubits\, the partial transpose of densi ty matrices is known as a good candidate to diagnose separable states. In p articular\, it can be used to define an entanglement measure called the (lo garithmic) negativity. Surprisingly\, the extension of the partial transpos e (and so the negativity) to fermionic systems remained intractable even fo r the non-interacting Gaussian states. In this talk\, I will introduce part ial time-reversal transformation as an analog of partial transpose for ferm ionic density matrices. This definition naturally arises from the spacetime picture of density matrices in which partial transpose is equivalent to re versing the arrow of time for one subsystem relative to the other subsystem . I will show that the partial time-reversal of density matrix can be compu ted efficiently for fermionic Gaussian states and its norm satisfies the ne cessary quantum information theoretic properties to qualify as an entanglem ent measure. Hence\, we call it the fermionic negativity.\n\nHost: Mohammad Hafezi LAST-MODIFIED:20181026T161931Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200928T110000 DTEND;TZID=America/New_York:20200928T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201216T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20201012T110000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com CREATED:20200924T011350Z DESCRIPTION:Title: \; Quantum Dot Molecules: Interesting physics and op portunities for scalable quantum devices

    Speaker: Matt Doty\, Univer sity of Delaware

    Abstract: \; Quantum dots are often described a s artificial atoms because they have discrete energy levels analogous to th ose of natural atoms. Solid state quantum dots (e.g. InAs in GaAs) can be e xtended from artificial atoms to artificial molecules by controlling the re lative spatial proximity and orientation of a pair of quantum dots. These p airs of dots are called quantum dot molecules (QDMs) because coherent tunne l coupling between the individual quantum dots leads to the formation of mo lecular states analogous to those in diatomic molecules. Unlike ‘natural’ m olecular states\, the properties of these artificial molecules can be varie d both during growth and in situ by applied fields. As a result\, QDMs pres ent a unique opportunity to apply molecular engineering principles to desig n new components for scalable optoelectronic quantum device technologies. I will first describe how a range of spintronic and photonic properties aris e from the structure\, composition\, and applied field environment of a QDM . I will then discuss how these properties lead to new opportunities for qu antum devices. Finally\, I will describe our progress toward overcoming pra ctical challenges to create a quantum-dot-based scalable material platform for quantum device applications. \;

    We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will r eceive a Zoom link in an email announcing each seminar. For those without a ccess to Zoom\, we will also be live streaming each seminar on YouTube. Onc e a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.y outube.com/user/JQInews \;(link \;is external) LAST-MODIFIED:20200925T163759Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181003T150000Z DTEND:20181003T160000Z DTSTAMP:20260828T094430Z UID:3mmnhmuerie6eoe42jatruc8p9@google.com CREATED:20180905T134420Z DESCRIPTION:Speaker: Professor Yan Yu\, Indiana University\, Bloomington\n\ nTitle: Spatially Organizing Biointerfaces to Interrogate Immune Functions\ n\nAbstract: The immune system functions on the basis of intricately organi zed chemical reactions and physical forces. Examples range from the engulfm ent of invading bacteria that relies on a fine balance of competing mechani cal forces\, to the activation of Tlymphocytes that requires collective int eractions between thousands of receptors at the junction between cells. Owi ng to the complexity of these processes\, understanding immune functions us ing traditional biological tools is highly challenging. In this talk\, I wi ll present my group’s research progress towards designing unique biointerfa ces to enable the quantitative understanding and manipulation of immune fun ctions. Our research so far has capitalized on Janus particles\, which\, li ke the two-faced Roman god Janus\, are made chemically\, biologically\, opt ically or magnetically asymmetric. We developed Janus particle-based toolse ts for measuring cell dynamics in multi-dimensions beyond translational mot ion and for spatiotemporally controlling cell functions. Using these method s\, we uncovered new dynamics and mechanisms in immune processes\, from pha gocytosis to intracellular trafficking\, which would otherwise be difficult to access with traditional means. LAST-MODIFIED:20180927T131734Z LOCATION:Chem 0112 Marker Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191029T171500Z DTEND:20191029T181500Z DTSTAMP:20260828T094430Z UID:5eraddqf4t3mba8nmqpolo9bke@google.com CREATED:20190910T140341Z LAST-MODIFIED:20190910T140341Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190207T123000 DTEND;TZID=America/New_York:20190207T133000 RRULE:FREQ=WEEKLY;UNTIL=20190510T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20190307T123000 EXDATE;TZID=America/New_York:20190321T123000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com CREATED:20190115T151128Z DESCRIPTION:Title: TBA\nSpeaker: Name\nUniversity of | Department of \n\nA bstract: TBA LAST-MODIFIED:20190115T151241Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190906T190000Z DTEND:20190906T210000Z DTSTAMP:20260828T094430Z UID:6neqggaa8n3nq3gpuvkpbtu9tp@google.com CREATED:20190904T143236Z DESCRIPTION:Title : Ab initio modeling of auroral formation in the magnetos phere-ionosphere coupling\n\nSpeaker Name: Prof. T-H. Watanabe\n\nSpeaker I nstitution : Nagoya University LAST-MODIFIED:20190904T201858Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200507T200000Z DTEND:20200507T213000Z DTSTAMP:20260828T094430Z UID:25vneo9s19cj67uljuoqq5c01s@google.com CREATED:20200103T182546Z DESCRIPTION:Will be conducted through zoom.\n\nSpeaker: Kimberly Boddy\, JH U\n\nTitle: Searching for Dark Matter Interactions in Cosmology\n\nAbstract : There is a substantial effort in the physics community to search for dark matter interactions with the Standard Model of particle physics. Collision s between dark matter particles and baryons exchange heat and momentum in t he early Universe\, enabling a search for dark matter interactions using co smological observations in a parameter space that is complementary to that of direct detection. In this talk\, I will describe the effects of scatteri ng throughout cosmic history and present corresponding constraints. I will also discuss future prospects for cosmological searches. LAST-MODIFIED:20200501T174332Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190319T171500Z DTEND:20190319T181500Z DTSTAMP:20260828T094430Z UID:1jn33vd3kl2f43bnrugc5btm9f@google.com CREATED:20190124T134523Z LAST-MODIFIED:20190124T134523Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar-SPRING BREAK - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190308T180000Z DTEND:20190308T190000Z DTSTAMP:20260828T094430Z UID:3ghunvtb4fcsmc4urk52imiqpg@google.com CREATED:20190124T141917Z DESCRIPTION:Speaker: Professor and Chair\, Naresh Thadhani\, MSE\, GA Tech< br>
    Title: Time-Resolved Optomechanical Sensing of Shock Pressures Using 1-D Photonic Crystal Structures

    Abstract: Shock-compression of materials generates unique and non-equilibrium states that allow studies in regimes not easily accessible by other methods. Most intriguing is the understanding of shock-initiated chemical\, mechanical\, and physical chang es in reactive/energetic particulate materials. The highly heterogeneous st ructure of such materials involves changes dominated by meso-scale processe s associated with interactions of shock waves with constituents of widely d ifferent physical and mechanical properties. Time-resolved sensing of local ized pressure distributions associated with the interactions is essential f or understanding the mechanistic processes and designing devices for use un der extreme shock-compression loading conditions. Computational modeling ap proaches provide qualitative descriptions of meso-scale processes\, but lac k validation due to unavailability of time-resolved experimental methods fo r capturing the conditions at such length scales. To address this critical gap\, we are investigating the design and application of optomechanical sen sors based on a Distributed Bragg Reflector (DBR) composed of dielectric st acks alternating layers of high and low refractive index materials\, and an Optical Micro Cavity (OMC) composed of dielectric cavity layer material pl aced between two metal-mirror layers. These 1-D photonic crystal structures generate size-tunable characteristic spectral changes that can be observed in reflection either through reflectance peak (for DBRs)\, or minima (for OMCs). The multilayer structures also provide spatially-varying pressures\, as localized changes in multilayer physical states produce corresponding c hanges in similarly scaled spectral responses. In this presentation\, the s hock-induced spectral responses obtained by directly subjecting the DBR and OMC structures to both homogeneous and heterogeneous pressure loads\, usin g laser-driven shocks and time-resolved spectroscopy enabled by spectrograp h-coupled streak camera\, will be described\, along with results of concurr ently performed optomechanical simulations utilizing a custom multi-physics framework. The results reveal a highly time-resolved spectral response to shock compression\, manifesting as wavelength shifts and intensity changes as a function of the shock pressure\, which correlate well with simulations from predictive models. The ability to capture pressure distributions with micro-scale spatial variations\, is also demonstrated for particulate mate rials. LAST-MODIFIED:20190205T161203Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191007T110000 DTEND;TZID=America/New_York:20191007T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191007T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Optical lattice quantum materials: A quantum playground\ n\nSpeaker: Markus Greiner\, Harvard\n\nAbstract: With quantum simulations it becomes possible to explore many-body quantum physics in regimes that ar e beyond what is computationally accessible. Using ultracold fermionic atom s in optical lattices\, we realize the iconic “Fermi-Hubbard” model\, and o ur quantum gas microscope gives us ultimate single particle control. We hav e observed antiferromagnetism in the Hubbard model and signatures of geomet ric strings upon doping\; now we are starting to "zoom in" on the low-tempe rature phases of this model\, which may hold the key to understanding quant um materials such as high temperature superconductors and beyond. LAST-MODIFIED:20190924T112518Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191004T160000Z DTEND:20191004T170000Z DTSTAMP:20260828T094430Z UID:5749itdtlpluarif6fcsaljrm5@google.com CREATED:20190930T123014Z DESCRIPTION:Title: Quantum Simulation of Hyperbolic Space with Circuit Quan tum Electrodynamics: From Graphs to Geometry\n\nSpeaker: Igor Boettcher\n\n Friday 4 October\, 12:10-12:40pm\n(pizza and drinks served 10 min. before t alk)\n\nAbstract: Looking for some fresh bathroom tiles? Why don't you try regular 7-gons this time\, it looks really cool! Only requirement would be that you live in hyperbolic space of constant negative curvature. To get a feeling how that would be like\, you should look into some recent breakthro ugh experiments in circuit quantum electrodynamics\, where such tilings are realized with superconducting waveguide resonators and photons are tricked into believing that space is hyperbolic: I will present how these finite l attice geometries can be mapped onto quantum field theories in continuous n egatively curved space. This provides a computational tool to determine obs ervables of the discrete system analytically even for large lattices\, wher e exact diagonalization fails due to exponential growth in system size. As an application we quantitatively reproduce ground state energy\, spectral g ap\, and correlation functions of the noninteracting lattice system by mean s of analytic formulas on the Poincare disk\, and show how conformal symmet ry emerges for large lattices. This sets the stage for studying the effects of interactions and disorder on hyperbolic graphs\, and to resolve fundame ntal open problems at the interface of interacting many-body systems\, quan tum field theory in curved space\, and quantum gravity using tabletop exper iments. LAST-MODIFIED:20190930T123014Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191204T200000Z DTEND:20191204T210000Z DTSTAMP:20260828T094430Z UID:1hlgbd1lre44i1ap0s9qev7965@google.com CREATED:20191121T140016Z DESCRIPTION:






    Speaker Name: Prof. Mohammad Hafez i
    Speaker Institution : UMD ECE\, Physics\, and JQI
    Notes: 3:00pm E ST (Refreshments served at 2:30pm).

    Abstract : We first discuss ho w topological physics can be observed for photons\; specifically\, how vari ous quantum Hall models can be simulated in an optical system. We report on the imaging and measurement of topological photonic edge states and the ge neration of correlated-photon pairs\, in silicon photonics platform. We the n discuss how strong interaction between photons can be created by the inte gration of topological photonic structures with solid-state quantum emitter s.

    Moreover\, we describe how photons\, in a different role\, could be exploited to probe and manipulate electronic states. Examples include: (1) optical creation and manipulation of topological excitations with light \, (2) light-induced superconductivity and topology. More generally\, we di scuss how quantum optics toolbox can be used to probe and manipulate correl ated states of electrons.


    *NEW POLICY: All Visitors to LPS must present a photo ID for entry to the colloquium*


    Note: LPS is loc ated at 8050 Greenmead Drive in College Park. There is parking at LPS and o verflow parking at the adjacent LTS building but not at the 4H building. LP S is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please u se the phone on the left hand side of the front door to call the receptioni st for entry.
    For more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoy z. LAST-MODIFIED:20191121T140016Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200213T123000 DTEND;TZID=America/New_York:20200213T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200213T123000 CREATED:20200109T211506Z DESCRIPTION:Title: Modeling the Effects of Thermoregulation on Human Sleep\ nSpeaker: Shelby Wilson\nUniversity of Maryland | Department of Biology\n\n Abstract: Sleep is a behavioral state in which we spend nearly one third of our lives. This biological phenomenon clearly serves an important role in the lives of most species. Here\, we present a mathematical model of human sleep- wake regulation with thermoregulatory functions to gain quantitative insight into the effects of ambient temperature on sleep quality. Numerica l simulations provide quantitative answers regarding how humans sleep dynam ics might adjust in response to being challenged with ambient temperatures away from thermoneutral. We will discuss the dynamics associated with the model as well as how the model could be used as a foundation for in silico simulations pertaining to jet lag\, sleep deprivation\, and temperature eff ects on sleep. LAST-MODIFIED:20200131T141259Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200305T160000Z DTEND:20200305T170000Z DTSTAMP:20260828T094430Z UID:7mam496rhh0al9ns1p31tqr7mo@google.com CREATED:20200219T145047Z DESCRIPTION:Speaker: Alexei Bazavov\, University of Michigan\n\nTitle: The equation of state and deconfinement in QCD\n\nAbstract: The low-energy phas e of the theory of strong interactions\, Quantum Chromodynamics (QCD)\, fea tures a remarkable property of confinement - the spectrum contains composit e\, color-neutral states\, while states with non-zero color charge are not observed. At high temperatures and/or densities the strongly interacting ma tter undergoes a transition into the deconfined phase called Quark-Gluon Pl asma (QGP). The properties of QGP are being studied experimentally at the R elativistic Heavy-Ion Collider (RHIC) at BNL and the Large Hadron Collider (LHC) at CERN. On the energy scales accessible to the experiments the theor y is still strongly coupled and lattice gauge theory provides a non-perturb ative approach for solving it with stochastic methods. I review recent prog ress in understanding the thermodynamics of QCD: properties of the transiti on into the deconfined phase\, signatures of deconfinement and restoration of the chiral symmetry\, and the equation of state of QGP at high temperatu re and density. LAST-MODIFIED:20200228T152717Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191111T200000Z DTEND:20191111T213000Z DTSTAMP:20260828T094430Z UID:4f6fqts278iuo51v7j3l47v2jg@google.com CREATED:20190930T152353Z DESCRIPTION:Speaker: Srimoyee Sen\, Iowa State University\n\nTitle: Higgs-c onfinement phase transition in 2+1 D abelian superfluids. \n\nAbstract : I discuss the conditions under which Higgs and confining regimes in a gauge t heory can be sharply distinguished. It is widely believed that these regime s are smoothly connected unless they are distinguished by the realization o f global symmetries. However\, we show that when a U(1) global symmetry is spontaneously broken in both the confining and Higgs regimes\, there is a n ovel order parameter which can detect certain Higgs-confinement phase trans itions. This result is explained in the context of certain tractable gauge theories in three spacetime dimensions. LAST-MODIFIED:20191031T201807Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181019T170000Z DTEND:20181019T183000Z DTSTAMP:20260828T094430Z UID:70ss450a17rm6dck3nrj8kil6b@google.com CREATED:20181012T161812Z DESCRIPTION:Topic: Concept\, status and challenges of quantum structural en gineering

    Speaker: Alexandre Zagoskin\, Loughborough University\, UK

    Abstract: \;

    Current experimental techniques allow to fa bricate\, manipulate and maintain at least partial quantum coherence in str uctures comprising thousands of quantum bits. A direct simulation of quantu m systems of this size using available classical computers is impossible\, and the fundamental impossibility of the simulation of large quantum system s by classical means does not leave any hope for the brute force methods. I t is therefore necessary to look for different approaches toward structural quantum engineering (i.e.\, design\, characterization and optimization of large quantum coherent structures based on the properties of their constitu ent elements and their interconnections). A possible way forward opens if t here exist qualitatively different regimes of operation of large quantum co herent structures controlled by universal\, experimentally accessible dimen sionless parameters. Some candidates for such parameters will be discussed.

    LAST-MODIFIED:20181012T161812Z LOCATION:PSC Bldg Room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Special Seminar: Concept\, status and challenges of quantum st ructural engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190218T210000Z DTEND:20190218T220000Z DTSTAMP:20260828T094430Z UID:2t01qjuj317tv8u0elskrnu283@google.com CREATED:20190118T165950Z DESCRIPTION:Title: The “Digital” Nature of Protein Structure\n\nSpeaker: Ge vorg Grigoryan\, Dartmouth College\n\nNotes: http://marylandbiophysics.umd. edu/seminars/\n\nAbstract: \n\nWhile we know that protein sequence encodes structure\, capturing this sequence-to-structure mapping computationally ha s been difficult. Particularly so because the space of structural possibili ties appears immense and complex. We propose that this space should neverth eless be describable as a combination of discrete local structural patterns . We introduce the concept of a TERM (tertiary motif)\, which encapsulates the full structural environment around a given residue\, and show that the protein structural universe is highly degenerate at the level of TERMs. In fact\, only 650 TERMs describe over 50% of the structural database at sub-A ngstrom resolution. We go on to show that such degeneracy enables the direc t quantification of sequence-structure relationships. Local sequence models can be extracted for each TERM contained in a protein structure\, based on the frequent reuse of TERMs in unrelated proteins\, with the overall prote in structure described as a combination of these models. We have begun to d emonstrate the broad applicability of such a framework across a variety of applications: 1) protein design: we have either partially or fully redesign ed multiple proteins using TERM data alone\, as well as designed novel stru ctures de novo (with experimental validation)\; 2) structure prediction: we found that TERM-based sequence statistics identify accurate models\; 3) we have shown that mutational stability changes are predicted quantitatively from TERM data alone. Earlier findings of degeneracies in the protein struc ture (e.g.\, for secondary and super-secondary motifs)\, have greatly advan ced computational structural biology. TERM-based mining of structural data is the next logical step that should provide further quantitative insights into sequence-structural relationships. LAST-MODIFIED:20190123T133013Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181011T150000Z DTEND:20181011T160000Z DTSTAMP:20260828T094430Z UID:6r5gbil9keud0re3nuijrec8u5@google.com CREATED:20181004T152114Z DESCRIPTION:An encoded qubit in a trapped-ion oscillator\n\nChrista Flühman n\, \nETH Zürich\n\nAbstract: I will present recent experiments demonstrat ing a qubit encoded in the harmonic motion of a single trapped 40Ca+ ion [1 ]. The usage of the oscillator allows to study a logical qubit with a singl e quantum system\, while in contrast commonly used error-correction schemes are based on arrays of many physical qubits. The approximate logical code states are formed from a periodically spaced superposition of displaced squ eezed components\, which has theoretically been shown to have optimal perfo rmance for a large set of errors [2\, 3]. Our first time demonstration of t hese qubits is based on coupling the ion motional oscillator to an internal state ancillary qubit\, which we can subsequently readout. This indirect r eadout of the oscillator via the ancillary qubit we have previously interpr eted as a modular position or momentum measurement and explored the relatio ns between sequences of these measurements [4]. Such sequences allow us to create the logical codes states as well as measure their spatial and moment um probability densities\, revealing the non-local features simultaneously present in both densities. Using the modular measurements we further implem ent logical state readout in the Pauli basis which we demonstrate on the si x cardinal states of the Bloch sphere for which we reach an average square fidelity of 87.3 ± 0.7%. We implement the logical Pauli gates by displaceme nts of the oscillator and realize arbitrary single qubit operations by modi fying the modular measurements slightly. We analyze the performance of a un iversal single logical qubit gate set by performing process tomography\, fo r Pauli gates we reach process fidelities of ≈ 97%\, while for continuous r otations we achieve fidelities of ≈ 89%.\n[1] C. Flühmann\, T. L. Nguyen\, M. Marinelli\, V. Negnevitsky\, K. Mehta\, and J. Home\, (2018)\, arXiv:180 7.01033.\n[2] D. Gottesman\, A. Kitaev\, and J. Preskill\, Phys. Rev. A 64\ , 012310 (2001).\n[3] K. Noh\, V. V. Albert\, and L. Jiang\, arXiv (2018)\, 1801.07271.\n[4] C. Flühmann\, V. Negnevitsky\, M. Marinelli\, and J. P. H ome\, Phys. Rev. X 8\, 021001 (2018).\n \nHost: Norbert Linke LAST-MODIFIED:20181004T152114Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200205T203000Z DTEND:20200205T213000Z DTSTAMP:20260828T094430Z UID:5o0enrf5ackrqjf3pitrjnnr7m@google.com CREATED:20200129T164055Z DESCRIPTION:Title : Drift-kinetic theory of tokamak alpha particle transpor t by MHD modes and ripple \nSpeaker Name: Elizabeth Tolman\nSpeaker Institu tion : MIT\n\nAbstract : Tokamak experiments fueled with deuterium and trit ium have a significant population of energetic alpha particles\; loss of th ese particles before they slow down is detrimental to experiment performanc e. Perturbations to the tokamak fields\, including magnetohydrodynamic (MHD ) modes and ripple\, are potential mechanisms for this loss. Alpha interact ion with these perturbations is often treated using a single particle formu lation. Here\, in contrast\, we derive a drift kinetic formulation capable of treating arbitrary perturbation frequency and toroidal and poloidal peri odicity. The resulting alpha flux is a sum of resonant contributions from r ipple and MHD modes\, and grows with mode amplitude and toroidal mode numbe r. We compute example fluxes for the case of toroidal Alfvén eigenmodes and consider consequences for next-generation tokamaks. \n \n swisdak@umd.edu LAST-MODIFIED:20200129T164055Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200310T160000 DTEND;TZID=America/New_York:20200310T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200310T160000 CREATED:20190530T191015Z LAST-MODIFIED:20200225T151537Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190910T160000 DTEND;TZID=America/New_York:20190910T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200513T035959Z;BYDAY=TU EXDATE;TZID=America/New_York:20191112T160000 EXDATE;TZID=America/New_York:20191105T160000 EXDATE;TZID=America/New_York:20191203T160000 EXDATE;TZID=America/New_York:20191210T160000 EXDATE;TZID=America/New_York:20191015T160000 EXDATE;TZID=America/New_York:20191224T160000 EXDATE;TZID=America/New_York:20191231T160000 EXDATE;TZID=America/New_York:20191217T160000 EXDATE;TZID=America/New_York:20200107T160000 EXDATE;TZID=America/New_York:20200114T160000 EXDATE;TZID=America/New_York:20200121T160000 EXDATE;TZID=America/New_York:20200512T160000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com CREATED:20190530T191015Z LAST-MODIFIED:20190530T191015Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201204T180000Z DTEND:20201204T190000Z DTSTAMP:20260828T094430Z UID:1i79kmvkaugitrggvqdnn0n3sg@google.com CREATED:20200923T165904Z DESCRIPTION:Speaker: Izabela Szlufarska\, MSE Professor and Chair\, Univers ity of Wisconsin-Madison\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200930T161256Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190906T160000Z DTEND:20190906T170000Z DTSTAMP:20260828T094430Z UID:5mvoddqvc6a616et7cea457ec1@google.com CREATED:20190903T140138Z DESCRIPTION:\nTitle: "Signaling and scrambling with strongly long-range int eractions"\n\n\nSpeaker: Andrew Guo\nAbstract: Strongly long-range interact ing quantum systems---those with interactions decaying as a power-law 1/r^α in the distance r on a D-dimensional lattice for α ≤ D---have received sig nificant interest in recent years. They are present in leading experimental platforms for quantum computation and simulation\, as well as in theoretic al models of quantum information scrambling and fast entanglement creation. Since no notion of locality is expected in such systems\, a general unders tanding of their dynamics is lacking. As a first step towards rectifying th is problem\, we prove two new Lieb-Robinson-type bounds that constrain the time for signaling and scrambling in strongly long-range interacting system s\, for which no tight bounds were previously known. Our first bound applie s to systems mappable to free-particle Hamiltonians with long-range hopping \, and is saturable for α ≤ D/2. Our second bound pertains to generic long- range interacting spin Hamiltonians\, and leads to a tight lower bound for the signaling time to extensive subsets of the system for all α < D. This r esult also lower-bounds the scrambling time\, and suggests a path towards a chieving a tight scrambling bound that can prove the long-standing fast scr ambling conjecture. LAST-MODIFIED:20190904T201935Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Joint Seminar with JQI\, QuICS\, and CMTC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200930T150000Z DTEND:20200930T161500Z DTSTAMP:20260828T094430Z UID:2c37buis3mctik03kjqlf7k5e0@google.com CREATED:20200917T181509Z DESCRIPTION:Speaker: Dodson Group

    Title: Literature Seminar for Emil y Hockey

    Abstract: \;Interstellar radical-neutral reactions\, su ch as the reaction between methanol and the hydroxy radical\, are of great interest to astronomers. There have been difficulties in accurately modelin g the products of this gas-phase reaction. This seminar will analyze experi mental and theoretical studies that have attempted to provide a deeper unde rstanding of the mechanisms leading to the methoxy radical product and its role in interstellar chemistry. \; \; \;


    References:
    1. K. Acharyya\, E. Herbst\, R.L. Caravan\, R.J. Shannon\, M.A. Bl itz &\; D.E. Heard. \;The importance of OH radical–neutral low te mperature tunnelling reactions in interstellar clouds using a new model. \; \;Molecular Physics.  \;2015\, 113 (15-16)\, 2243-2 254. \;
    2. M. Antiñolo\,\, M. Agúndez\, E. Jiménez\, B. Balles teros\,\, A. Canosa\, G. El Dib\, Albaladejo\, and J. Cernicharo. \; Reactivity Of OH And CH3OH Between 22 And 64 K: Modeling The Gas Phase Prod uction Of CH3O In Barnard 1b. The Astrophysical Journal. \;2016< /b>\, 823 (1)\, 25.
    3. A. Ocaña\, S. Blázquez\, A. Potapov\, B. Ba llesteros\,  \;A.Canosa\, M. Antiñolo\, L. Vereecken\, J. Albaladejo\, and E. Jiménez.  \;Gas-phase reactivity of CH3OH toward OH at inters tellar temperatures (11.7–177.5 K): experimental and theoretical study.  \;Physical Chemistry Chemical Physics. \;2019\, 21\, 6942-6 957.

    ZOOM: \;https://umd.zoom.us/j/99348316304?pwd=c VBweTlMVUZWQ3hrQW9MbWNuMWxkdz09 LAST-MODIFIED:20200928T105401Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190917T150000Z DTEND:20190917T160000Z DTSTAMP:20260828T094430Z UID:2stjht25qdkkbntu9au9g1hk98@google.com CREATED:20190913T181950Z DESCRIPTION:Title:  Charge Noise Induced Decoherence in Spin Qubits\n\nSpea ker:  Dr. Jason Kestner (UMBC)\n\nCondensed Matter Theory Center website:\n http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190913T181950Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal CMTC Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191001T150000Z DTEND:20191001T160000Z DTSTAMP:20260828T094430Z UID:3l07pp7qgm3flj74olis57cgpn@google.com CREATED:20190930T144437Z DESCRIPTION:Speaker: Dr. Christina Bergonzo\, NIST\n\nTitle: Maximizing the Accuracy of RNA Structure in Refinement Against NMR Data\n\nAbstract: TBA LAST-MODIFIED:20190930T144437Z LOCATION:Room 0112 Marker Seminar Room Chemistry Bldg. #091 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chemistry and Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201026T190000Z DTEND:20201026T200000Z DTSTAMP:20260828T094430Z UID:4d6ii5evgftf5f0ge3mcvhpm3e@google.com CREATED:20201012T172904Z DESCRIPTION:Seminar to be conducted via zoom.

    Speaker: Joshua Foster \, University of Michigan

    Title : Searches for Astrophysical Axion C onversion with Radio Observations

    Abstract : The QCD axion\, which m ay solve the Strong CP problem\, and axion-like particles\, which arise nat urally in many models of high-scale physics\, provide theoretically compell ing dark-matter and dark-sector candidates. The extreme environments charac terized by large magnetic fields\, high densities\, and high temperatures r ealized in astrophysical contexts provide natural laboratories to search fo r axions which couple to electromagnetism and matter. In this talk\, I will discuss recent results and ongoing work towards the discovery of axions us ing radio of neutron stars and neutron \;star populations. \; \ ;In particular\, I will focus on dedicated radio searches using the Effelsb erg and Greenbank Telescopes that have resulted in new constraints on axion DM in the 1-10 mueV range as well as prospects for future observations.

    For zoom link please contact mknouse@ umd.edu LAST-MODIFIED:20201023T190051Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190327T200000Z DTEND:20190327T213000Z DTSTAMP:20260828T094430Z UID:6jhdjprqlqvlf7u82lfstveoi6@google.com CREATED:20190322T171507Z DESCRIPTION:Title : "Some QCD-related Results from the ATLAS Experiment"\n\ nSpeaker : Hugo Beauchemin\, Tufts University \n\nAbstract : Precise measur ements of Standard Model cross sections and parameters as well as most of t he searches for new physics benefit from a thorough understanding of QCD\, particularly in the perturbative regime. Mismodeling of QCD effects is inde ed one the largest sources of uncertainty on these studies. Robust and prec ise QCD predictions are therefore crucial for the success of the overall LH C physics program. Measurements of the kinematic properties and dynamics of processes involving jets\, and comparisons to theoretical predictions prov ide a rich ground to study and improve our knowledge of the strong interact ion. In this presentation\, I will review what we can learn from such measu rements\, and what recent results obtained by the ATLAS collaboration tell us about the strong interaction. LAST-MODIFIED:20190322T171514Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201009T170000Z DTEND:20201009T180000Z DTSTAMP:20260828T094430Z UID:1ae7ap85k6nke5mc08cvdr2gqs@google.com CREATED:20200923T164550Z DESCRIPTION:Speaker: Yongho Sohn\, MSE Professor\, University of Central Fl orida

    Title: Selected Observations of Microstructural Development in Metallic Alloys Additively Manufactured by Laser Powder Bed Fusion

    Abstract: Additive manufacturing (AM)\, commonly referred to as 3D printing \, of metallic alloys is a disruptive technology that can produce net-shape components with nearly unlimited geometrical complexity and customization. This technology also brings an opportunity to design new and modified allo ys based on robust understanding of phase equilibria and kinetics so that t he dependent process variables are de-sensitized and thermo-kinetic environ ments associated with AM are utilized effectively. In this presentation\, i n-laboratory\, hands-on\, closed-loop experimental research capability for gas atomization and laser powder bed fusion (LPBF) for metallic alloy devel opment will be first introduced. Selected observations of microstructural d evelopment from solidification\, micro-segregation\, cracking\, homogenizat ion\, and precipitation will be presented for Al-\, Mg-\, Ni-\, and Fe-base alloys\, both commercially available and new/modified compositions. Proper ties for loadbearing\, corrosion resistance\, and biomedical applications w ill be explored for expansive application of AM technology. Practical use o f knowledge in thermodynamics\, phase diagrams and diffusion kinetics in de signing and modifying the alloy composition for enhanced printability (or b uildability) and properties will be highlighted. Pervasive throughout the p resentation are the lessons and paths towards an understanding of the class ical relation\, structure-properties-processing (including AM) in materials science and engineering.

    Biography:

    Dr. Yongho Sohn is a Pegasus P rofessor and Lockheed Martin Professor of Engineering in the Materials Scie nce and Engineering Department at University of Central Florida. He receive d his B.S. with honors and M.S. from Worcester Polytechnic Institute\, Worc ester\, MA in Mechanical and Materials engineering\, respectively. He gradu ated in 1999 with Ph.D. in Materials Engineering from Purdue University and spent two years as a post-doctoral research scholar at the University of C onnecticut. He joined University of Central Florida in 2001 as an assistant professor. His research and teaching interests includes metallic alloy pow der processing and additive manufacturing\, microstructural analysis and co ntrol\, multicomponent intrinsic and interdiffusion in multiphase alloys\, protective metallic/ceramic coatings for high temperature applications\, li ght-weight metallic alloys and metal-matrix composites\, and materials char acterization. He is a Fellow of ASM International (FASM)\, recipient of NSF CAREER Award (2003)\, Outstanding Materials Engineer Award from Purdue Uni versity (2016)\, 2020 Engineer of the Year Award from Korean-American Scien tists and Engineers Association\, UCF’s 2017\, 2012 and 2006 Research Incen tive Awards\, and UCF’s 2007 and 2013 Teaching Incentive Award. He is an As sociate Editor for Journal of Phase Equilibria and Diffusion and a Board of Review member for Metallurgical and Materials Transactions. Details on his research and teaching activities can be found at http://mse.ucf.edu/sohn.< /p>

    ZOOM: via Zoom only

    Sherri Tatum
    statum12@umd.edu


    LAST-MODIFIED:20200923T164851Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Material Sciences & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190221T190000Z DTEND:20190221T203000Z DTSTAMP:20260828T094430Z UID:3gvdqt8gg6ikc9g8dg0s4ul6sf@google.com CREATED:20190131T153601Z DESCRIPTION:Title: The implications of geometric frustration and orbital de generacies on the evolution of magnetism in Na4Ir3O8 and α-NaMnO2\nSpeaker: Rebecca Dally\, NIST\nAbstract: \nSpin-orbit intertwined order gives rise to many novel phenomena with a broad phase space spanned by the competing e nergy scales within a system. This work synthesized and studied two such sy stems demonstrating different manifestations of spin-orbit interactions\, o riginating from orbital degeneracy effects\, on geometrically frustrated ma gnetic lattices. Firstly\, strong spin-orbit coupling in the hyperkagome la ttice\, Na4Ir3O8\, and secondly\, the layered material\, α-NaMnO2\, where s ingle-ion anisotropy and a cooperative Jahn-Teller distortion drive magneti sm to the quasi-1D limit.\nThe magnetic ground state of the Jeff = ½ spin-l iquid candidate\, Na4Ir3O8\, is explored via combined bulk magnetization\, muon spin relaxation\, and neutron scattering measurements. A short-range\, frozen\, state comprised of quasi-static moments develops below a characte ristic temperature of TF = 6 K\, revealing an inhomogeneous distribution of spins occupying the entirety of the sample volume. Quasi-static\, short-ra nge\, spin correlations persist until at least 20 mK and differ substantial ly from the nominally dynamic response of a quantum spin liquid.\nThe secon d spin-orbit intertwined system\, α-NaMnO2\, undergoes a cooperative Jahn-T eller distortion of the MnO6 octahedra arising from an orbital degeneracy i n the Mn3+ cations\, and directly affects the electronic (ferro-orbital) an d magnetic (antiferromagnetic) order\, which results in an intriguing study of low-dimensional magnetism. Intricacies of the structure\, static magnet ic order\, and magnon dynamics are presented\, which heavily relied on neut ron scattering techniques. In particular\, a longitudinally polarized bound magnon mode is characterized through the use of polarized neutron scatteri ng.\nHost: Paglione LAST-MODIFIED:20190204T184428Z LOCATION:Room 1201 John S. Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Rebecca Dally\, NIST TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190426T183000Z DTEND:20190426T203000Z DTSTAMP:20260828T094430Z UID:693e2fsnr7nk8bnucg5amgn3bg@google.com CREATED:20190228T210802Z DESCRIPTION:Roberto Franceschini\, Rome 3 University & INFN\n\nTitle: "The CLIC Potential for New Physics"\n\nAbstract: CLIC potential for new physics \nI will describe direct and indirect searches for new physics that can be carried out at a multi-TeV e+e- collider\, with specific results for the en ergies\, up to 3 TeV center of mass energy\, and luminosities foreseen for the CLIC future collider project. I will focus on the searches and interpre tations that aim at the discovery of new dynamics able to address some of t he fundamental issues left open in the Standard Model. I will hint at possi ble extensions of these results and their impact for new physics that can b e obtained at even higher center of mass energies\, e.g. with muon collider s in the range of tens of TeV center of mass energy. LAST-MODIFIED:20190425T131733Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201207T200000Z DTEND:20201207T210000Z DTSTAMP:20260828T094430Z UID:2f21l7ekq1g9e48dr0uhq88u5n@google.com CREATED:20201120T152835Z DESCRIPTION:Marc Riembau\, University of Geneva

    Title: Positive Mome nts for Scattering Amplitudes

    Abstract: Using dispersion relations o n the forward amplitude\, with the only asumptions of unitarity and analiti city\, the Wilson coefficients of an effective field theory can be mapped i nto moments of a positive distribution. Besides recovering the known positi vity constraints\, the structure of moments puts stringent constraints on t he structure of the EFT. This allows us to show that supersoft theories are not UV completable. Moreover\, the dispersive quantities are sensitive to the infrared loops\, giving us a handle to study the structure of allowed R G flows.



    For zoom link please email mknouse@umd.edu. LAST-MODIFIED:20201204T150405Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200330T200000Z DTEND:20200330T210000Z DTSTAMP:20260828T094430Z UID:5g1r952gbdgsaha8mt3802jaqk@google.com CREATED:20200319T181448Z DESCRIPTION:**This seminar will be conducted remotely via Zoom**\n\nHarikri shnan Ramani\, UC Berkeley\n\nTitle: Nuclear Isomers as Dark Matter acceler ators.\n\nAbstract: Weak-scale dark matter particles\, in collisions with n uclei\, can mediate transitions between different nuclear energy levels. In particular\, owing to sizable momentum exchange\, dark matter can enable d e-excitation of metastable nuclear isomers trapped in a higher excited stat e due to angular momentum selection rules. As a result\, this detection con cept is exothermic in nature and is especially useful for detecting dark ma tter that would go undetected in traditional direct detection experiments o wing to the requirement of energy transfer from detector to dark matter. I will present two example models\, dark matter that interacts strongly with nuclei and inelastic dark matter. I will also talk about examples of nuclea r isomers that are especially suited for detection in each case. I will als o present results from reinterpreting limits on the lifetime of 180m Tantal um which close important gaps in the dark matter direct detection parameter space. LAST-MODIFIED:20200401T190005Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY: EPT Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201014T150000Z DTEND:20201014T160000Z DTSTAMP:20260828T094430Z UID:1f4f4o5ghl2icc8172h7btnce8@google.com CREATED:20200923T161700Z DESCRIPTION:Speaker: NSF Program Directors - Colby Foss\, CSDM-A and Richar d Dawes\, CTMC

    Title: \;Physical Chemistry Support at the Nation al Science Foundation

    Abstract: \;The Division of Chemistry (CHE ) at the National Science Foundation (NSF) supports a wide range of experim ental physical and theoretical chemistry research projects. Two Program Dir ectors from NSF/CHE will give a short presentation on the science supported by the Chemical Structure\, Dynamics and Mechanisms-A Program (Colby Foss) and the Chemical Theory\, Models and Computational Methods Program (Richar d Dawes)\, as well as opportunities for physical chemists in programs outsi de of NSF/CHE. Cross-cutting initiatives such as the Quantum Leap 'Big Idea ' offer opportunities for experimental physical chemistry and theory\; Drs. Foss and Dawes will discuss newly supported research directions including the exploration of quantum effects in physical models and chemical systems for quantum computing\, sensing\, and control.

    ZOOM Link: \;https://umd.zoom.us/j/92689174899?pwd=Rk50Mk lZY3VMSFRkUFpWQTVqcXVNUT09 LAST-MODIFIED:20201008T205624Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190228T150000Z DTEND:20190228T160000Z DTSTAMP:20260828T094430Z UID:5mt1hqo4hf3t8711fnmhe6mtq8@google.com CREATED:20190222T190853Z DESCRIPTION:Title: Academic publishing at Nature\n\nSpeaker: Luke Fleet\, S enior Editor and Physics Team Lead\, Nature\n\nAbstract: Nature has been se rving scientists and scientific communities since 1869 through publication of significant advances and by providing a forum for the reporting and disc ussion of news and issues concerning science. Nature-branded journals conti nue to strive to publish and communicate the most striking developments in science to broad audiences\, and we are keen to strengthen the representati on of applied sciences and engineering. This presentation will give insight into the policies and processes of the Nature-branded journals\, as well i nto their engagement with science and engineering communities.\n\nBio: Dr. Luke Fleet is a Senior Editor & Team Leader at Nature. Following a PhD on s emiconductor spintronics from the University of York and in collaboration w ith the RIEC at Tohoku University\, he undertook postdoctoral research in o rganic electronics at Imperial College London and the London Centre for Nan otechnology. Luke joined Nature Research in 2013 as an editor at Nature Com munications\, before moving to Nature Physics in 2014\, and then to Nature in 2017. In his role\, Luke is responsible for selecting the research paper s that are published in Nature across a range of fields\, including applied physics & electronics. He also assists the Chief Editor in devising and de livering the goals for the physics team. LAST-MODIFIED:20190227T180727Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181123T180000Z DTEND:20181123T190000Z DTSTAMP:20260828T094430Z UID:3nodscmftrvraoup92kfo8492p@google.com CREATED:20180905T153417Z LAST-MODIFIED:20181113T133752Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar - NO SEMINAR - HAPPY THANKS GIVING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190322T170000Z DTEND:20190322T180000Z DTSTAMP:20260828T094430Z UID:1ee1b7fijof9n1btjdf28ajijj@google.com CREATED:20190124T142123Z DESCRIPTION:Speaker: Jimmy Kotsakidis\, Ph.D. Student at Monash University\ , Physics Dept.\, Australia\n\nTitle: Fundamental Experimental Studies on t he Oxidation of Monolayer WS2 and Intercalation of Graphene on Silicon Car bide with the Alkali Earths\n\nAbstract: This talk will cover experiments o n the 2D materials WS­2 and graphene. We have examined the ambient oxidatio n of monolayer WS2\, finding that oxidation proceeds via a photoexcitation induced (photo-oxidation) pathway requiring absorbed light at or above the trion energy. Significant oxidation occurs for WS2 exposed to laboratory li ghts for weeks\, or a single typical photoluminescence map though is preven ted for WS2 stored in darkness. I will also present findings from STM and S ynchrotron XPS studies on the intercalation of mono and bilayer graphene on SiC with magnesium and calcium. LAST-MODIFIED:20190315T134539Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190328T123000 DTEND;TZID=America/New_York:20190328T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190328T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Turbulence and dynamo effect in electronic materials\nSp eaker: Victor Galitski\nUniversity of Maryland | Joint Quantum Institute\n\ nAbstract: The dynamo effect is a class of macroscopic phenomena responsibl e for generation and maintaining magnetic fields in astrophysical bodies. I t hinges on hydrodynamic three-dimensional motion of conducting gases and p lasmas that achieve high hydrodynamic and/or magnetic Reynolds numbers due to large length scales involved. The existing laboratory experiments modeli ng dynamos are challenging and involve large apparatuses containing conduct ing fluids subject to fast helical flows. Here we propose that electronic s olid-state materials -- in particular\, hydrodynamic metals -- may serve as an alternative platform to observe some aspects of the dynamo effect. In t his talk\, I will discuss two candidate systems -- Well semimetals and crit ical fluctuating superconductors\, where electronic turbulence and dynamo e ffect appear within experimental reach.\n\n[1] V. Galitski\, M. Kargarian\, and S. Syzranov\, "Dynamo Effect and Turbulence in Hydrodynamic Weyl Metal s\," Phys. Rev. Lett. 121\, 176603 (2018)\n\n[2] Y. Liao and V. Galitski\, "Two-Fluid Hydrodynamics and Viscosity Suppression in Fluctuating Supercond uctors\,"\n\nhttps://arxiv.org/abs/1903.08666 LAST-MODIFIED:20190325T131557Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201106T180000Z DTEND:20201106T190000Z DTSTAMP:20260828T094430Z UID:4c63k7u9tchl2d1j8c86jlpj3q@google.com CREATED:20200923T165647Z DESCRIPTION:Speaker: Diran Apelian\, Distinguished MSE Professor\, Universi ty of California\, Irvine

    Title: Megatrends for Materials Science an d Engineering for the 21st Century-Post COVID-19

    Abstract: Materials have always been and will continue to be a vehicle for advancing quality o f life\; as we know\, historically\, civilizations have been named after ma terials. \; In this 21st \;century\, with so many daunti ng needs and grand challenges that we face\, materials will play a huge rol e in meeting the needs of society\, but the key is whether we can do so in a sustainable way. \; In this seminar\, we will review megatrends and t heir implications as it relates to the field of materials science and engin eering. \; The presentation is divided into three segments: (i) Societa l needs and the role of MSE\; (ii) Industry 4.0 – the Future of Work\, and the Future of the Worker\; and (III) Paradigm changes in engineering educat ion. \;

    Bio:

    Diran Apelian is Distinguished Professor of MSE at the University of California\, Irvine\, Chief Strategy officer for the Sam ueli School of Engineering\, and Director of the Advanced Casting Research Center. \; He is also Provost Emeritus and Founding Director of the Met al Processing Institute at WPI\, Worcester\, Mass. He received his B.S. deg ree in metallurgical engineering from Drexel University in 1968 and his doc torate in materials science and engineering from MIT in 1972. Apelian is a Fellow of TMS\, ASM\, and APMI\; he is a member of the National Academy of Engineering (NAE)\, National Academy of Inventors (NAI)\, the European Acad emy of Sciences\, and the Armenian Academy of Sciences. The 2016 Bernard Go rdon Prize for Innovation in Engineering Education was awarded to WPI (Reci pients: D. Apelian\, K. Wobbe\, A. Heinricher and R. Vaz). With his colleag ues and students\, he has founded 6 companies: Materials Strategies\; Batte ry Resourcers\; Melt Cognition\; Kinetic Batteries\, Solvus Ventures\, and Solvus Global.

    www.mindyourme tal.com


    Where: via Zoom Sherri Tatum \;statum12@umd.edu \;  \;

    LAST-MODIFIED:20200930T160737Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200402T155000Z DTEND:20200402T165000Z DTSTAMP:20260828T094430Z UID:0kij6a3748kgo9l70srmigp7h0@google.com CREATED:20200331T200942Z DESCRIPTION:

    VictorYakovenko\, University of Maryland< /font>

    htt ps://wesleyan.zoom.us/j/869541729
    Zoom doors open around 11:50 am\, presentation starts at 12noon.

    Economic Inequality from a Statistical Physics Point of View
    Inequality is an important and seemingly inevitable aspect o f the humansociety. Various manifestations of inequality can be derived fro m the conceptof entropy in statistical physics. In a stylized model of mone tary economy\,with a constrained money supply implicitly reflecting constra ined resources\,the probability distribution of money among the agents conv erges to theexponential Boltzmann-Gibbs law due to entropy maximization. Ou r empirical dataanalysis shows that income distributions in the USA\, Europ ean Union\, and othercountries exhibit a well-defined two-class structure. The majority of thepopulation (about 97%) belongs to the lower class charac terized by theexponential ("thermal") distribution\, which we recently unco vered inthe data for 67 countries around the world. In contrast\, the upper class (about3% of the population) is characterized by the Pareto power-law ("superthermal") distribution\, and its share of the total incomeexpands an d contracts dramatically during booms and busts in financial markets.Global ly\, energy consumption (and CO2 emissions) per capita around the worldshow s decreasing inequality in the last 30 years and convergence toward theexpo nential probability distribution\, as expected from the maximal entropyprin ciple. All papers are available at http://physics.umd.edu/~yakovenk/econophysics/.
    https://wesleyan .zoom.us/j/869541729
    Zoom doors open around 11:50 am\, p resentation starts at 12 noon.

    LAST-MODIFIED:20200331T200942Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Econophysics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200129T193000Z DTEND:20200129T211500Z DTSTAMP:20260828T094430Z UID:3n2foom4uch6scbe4vi2u9328b@google.com CREATED:20200124T164545Z DESCRIPTION:





    Speaker N ame: Prof. John Q. Xiao
    Speaker Institution : University of Delaware\, D epartment of Physics and Astronomy

    Abstract : Discoveries of new phe nomena in magnetic materials are mostly driven by application needs. This presentation will first discuss the discovery of so-called anomalous spin o rbit torque (ASOT) in magnetic single-layer films [1] in which an electrica l current in a magnetic layer along the magnetization direction creates spi n orbit torques (SOTs) at the top and bottom surfaces. Consequently\, an e lectrical current in a magnetic layer can be used to create transverse spin current with out-of-plane spin polarization which can be used to switch an other perpendicularly magnetized magnetic layer without the need of a bias field. The development of magnetodielectric materials (MDMs) with tailored or matched dielectric permittivity and magnetic permeability is largely dr iven by the demand of miniaturized antenna\, magnetic shielding\, and wirel ess transfer. The critical challenge in developing MDMs is to develop high frequency soft magnetic materials. We will discuss the physical principle s that can be used to design materials and so-developed several material pl atforms.

    [1] Wang\, W.\, T. Wang\, V.P. Amin\, Y. Wang\, A. Radhak rishnan\, A. Davidson\, S.R. Allen\, T.J. Silva\, H. Ohldag\, D. Balzar\, B .L. Zink\, P.M. Haney\, J.Q. Xiao\, D.G. Cahill\, V.O. Lorenz\, and X. Fan\ , Anomalous spin–orbit torques in magnetic single-layer films. Nature Nanot echnology\, 2019.


    *NEW POLICY: All Visitors to LPS must present a photo ID for entry to the colloquium*


    Note: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the p hone on the left hand side of the front door to call the receptionist for e ntry.
    For more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20200124T164545Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200312T123000 DTEND;TZID=America/New_York:20200312T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200312T123000 CREATED:20200109T211506Z DESCRIPTION:Title: Testing of a Hybrid Modeling Approach for the Prediction of the Atmospheric State by Blending Numerical Modeling and Machine Learni ng\nSpeaker: Istvan Szunyogh\nTexas A&M | Department of Atmospheric Science s\nAbstract: The talk is an overview of the latest results of research effo rts to apply a hybrid (numerical-machine-learning) modeling approach develo ped at the University of Maryland to global weather prediction. The forecas t performance of the hybrid model is assessed by comparing it to that of pe rsistence\, a numerical physics-based model\, and a machine learning (ML) m odel\, whose prognostic state variables and resolution are identical to tho se of the hybrid model. The hybrid model typically provides realistic predi ction of the weather for the entire globe for about two-three days. Both th e hybrid and the ML model outperform persistence in the extratropics\, but not in the tropics. While the relative performance of the ML model compared to the physics-based model is mixed\, the hybrid model forecasts are more accurate than either the ML or the physics-based model forecasts at the sho rter forecast times. Potential techniques to further improve the short-term hybrid and ML forecasts and extend the valid time of the forecasts are als o discussed. LAST-MODIFIED:20200227T213057Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181023T150000Z DTEND:20181023T163000Z DTSTAMP:20260828T094430Z UID:36ckhgkd6j7ea672fejacruu1t@google.com CREATED:20180925T143142Z DESCRIPTION:Title: Building a universal description of certain non-Fermi liquid metals

    Speaker: Debanjan Chowdhury\, MIT
    Abstract: Numerous strongly correlated materials display non-Fermi li quid properties over a broad range of temperatures. One of the remarkable f eatures observed in many of these systems is the apparent universality of t he phenomenology\, in spite of the completely distinct microscopic details. Inspired by the rich phenomenology of such non-Fermi liquids\, I will cons truct examples of translationally invariant solvable models of metals\, tha t display crossovers as a function of temperature into regimes with local q uantum criticality and non-Fermi liquid behavior. I will show the existence of sharply defined critical Fermi surfaces in the non-Fermi liquid regime\ , that give rise to quantum oscillations in the magnetization as a function of an external magnetic field\, in the absence of quasiparticle excitation s. I will discuss the implications of these results for fundamental bounds on relaxation rates and speculate on possible coarse grained descriptions o f a class of intermediate scale non-Fermi liquid behavior in generic correl ated metals. Finally\, if time permits\, I will present new experimental re sults on some unconventional transport properties of magic-angle twisted bi layer graphene and comment on their possible connection with the rest of my talk.

    Host: Victor Galitski

    Condensed Matter Theory Center w ebsite:
    http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20181015T191711Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200423T150000Z DTEND:20200423T163000Z DTSTAMP:20260828T094430Z UID:2bnecnkidut8ebgdl76eo8os7u@google.com CREATED:20200415T192752Z DESCRIPTION:Seminar will be conducted via Zoom\n\nSpeaker: Arkaitz Rodas\, William and Mary\n\n\nTitle: Dispersive study of pi-K scattering data and t he lightest strange resonance kappa/K0*(700).\n\nAbstract: In this talk we discuss the simultaneous dispersive analyses of pi-K and pipi—>K K scatteri ng data and the kappa/K0*(700) pole determination. The unprecedented statis tics of present and future Hadron Experiments\, modern lattice calculations \, and the wealth of new states and decays\, require such precise and model -independent analyses to describe final state interactions. In particular\, we review and extend the caveats on some data\, showing their inconsistenc y with dispersion relations. Our main result is the derivation and compilat ion of precise amplitude parameterizations constrained by several pi-pi\, p i-K and pipi—>KK dispersion relations. As a result\, we provide new precise threshold and subthreshold parameters as well as a determination of the co ntroversial kappa/K0*(700) resonance\, and other light meson resonances. LAST-MODIFIED:20200420T195001Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191021T190000Z DTEND:20191021T203000Z DTSTAMP:20260828T094430Z UID:6mstvucdqhn2edepuno5ljs94o@google.com CREATED:20190627T204003Z DESCRIPTION:Speaker: Subhajit Ghosh\, Tata Institute\n\nTitle: Dark Neutrin o interactions phase out the Hubble tension (.. also make gravitational wav es blue)\n\nAbstract: New interactions of neutrinos can stop them from free streaming even after the weak interaction freezeout. This results in a pha se shift in the cosmic microwave background (CMB) acoustic peaks which can alleviate the Hubble tension. We demonstrate with Planck CMB and WiggleZ ga laxy survey data that this acoustic phase shift\, and thus solution to the Hubble tension\, can be achieved for neutrinos interacting with dark matter without significantly affecting other observables and without changing the number of relativistic degrees of freedom. We predict potentially observab le modifications of the CMB B-modes and matter power spectrum. LAST-MODIFIED:20191018T133004Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201112T210000Z DTEND:20201112T220000Z DTSTAMP:20260828T094430Z UID:5t9333voqbr4g823p102ndkb34@google.com CREATED:20200910T195635Z DESCRIPTION:\n\nSpeaker: Martin Schmaltz\, Boston University\n\nSeminar to be conducted via zoom.\n\nTitle and Abstract: tk\n\nFor zoom link please em ail mknouse@umd.edu LAST-MODIFIED:20200910T200011Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint EPT/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201019T110000 DTEND;TZID=America/New_York:20201019T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201019T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Extending the Performance of Noisy Superconductin g Quantum Processors

    Speaker: Irfan Siddiqi\, Berkeley

    Abstra ct: In this era of noisy intermediate-scale quantum (NISQ) computing\, syst ematic miscalibrations\, drift\, and crosstalk in the control of quantum bi ts can lead to a coherent form of error which has no classical analog. Such errors severely limit the performance of quantum algorithms in an unpredic table manner\, and mitigating their impact is necessary for realizing relia ble quantum computations. Randomized compiling is a protocol designed to ov ercome these performance limitations by converting coherent errors into sto chastic noise\, dramatically reducing unpredictable errors in quantum algor ithms and enabling accurate predictions of algorithmic performance from err or rates measured via cycle benchmarking. We demonstrate significant perfor mance gains under randomized compiling for the algorithms including the fou r-qubit quantum Fourier transform and for random circuits of variable depth on a superconducting quantum processor. Additionally\, we accurately predi ct algorithm performance using experimentally-measured error rates. Our res ults demonstrate that randomized compiling can be utilized to maximally lev erage and predict the capabilities of modern-day noisy quantum processors\, paving the way forward to scalable quantum computing.

    We are hostin g the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and af filiates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews \;(link \;is exte rnal) LAST-MODIFIED:20200930T171541Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200909T150000Z DTEND:20200909T160000Z DTSTAMP:20260828T094430Z UID:6ai0ua18kjt75dufto9c2gvjjp@google.com CREATED:20200903T125715Z DESCRIPTION:Speaker: John Fourkas\, UMD

    Title: The Electrical Double Layer Revisited

    Abstract: \;Recent experiments on ion transport in lithium perchlorate solutions in propylene carbonate or \;acetonitr ile in polycarbonate or silica nanopores demonstrated the presence of a pos itive \;effective surface potential (ESP)\, even though the same materi als would have a negative surface potential in aqueous solution. It was pro posed that this positive ESP arises from polar ordering of \;the solven t at the nanopore surfaces\, as the dipole moment of an acetonitrile molecu le\, for \;instance\, is 3.92 D. Furthermore\, experiments and simulati ons have indicated that acetonitrile at \;a silica surface forms a well -ordered\, and effectively immobile\, bilayer. These observations \;sug gest that the classical treatment of the electrical double-layer may be inc omplete for some \;non-aqueous solvents. Here we demonstrate\, with a c ombination of experiments and simulations\, \;that the ESP can result n ot only from surface charges\, but also from the local organization of the& nbsp\;solvent imposed by the interface. We further show that this ordering\ , and the corresponding \;potential\, can be remarkably insensitive to the presence of an electrolyte. Together\, these results \;suggest that it is necessary to revise the electrical double layer model for a broad ra nge of polar \;organic solvents.

    ZOOM: \;https://umd.zoom.us/j/91427880291?pwd=ZThrbmppS3RCSkxYcWs0c HJaZmgxdz09 LAST-MODIFIED:20200903T125715Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical/ANE Chemistry Phys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190404T230000Z DTEND:20190405T003000Z DTSTAMP:20260828T094430Z UID:1fi5ii1nn6sfnfq0npdrms1jlt@google.com CREATED:20190402T143626Z DESCRIPTION:SPACE: THE FINAL FRONTIER …FOR YOUR BODY. Join DR. Kate O’Neill to find out what happens to your body in space!\n\n\nFor more information \, please visit UMDPHYSICS.UMD.EDU/OUTREACH LAST-MODIFIED:20190402T143626Z LOCATION:1412 John S. Toll Physics Building\, 4150 Campus Dr\, College Park \, MD 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Your Body in Space TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190219T160000 DTEND;TZID=America/New_York:20190219T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190219T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Paul Corkum\, National Research Council of Canada and University of Ottawa\n\nTitle: A Plasma Perspective on Attosecond Science i n Solids and in Gases\n\nAbstract: Ionization turns an atomic or molecular gas into a plasma with initial plasma parameters determined by atomic or mo lecular ionization physics. This obvious symbiosis encourages us to explor e atomic ionization from a plasma perspective. When atoms are irradiated w ith intense light. That means that one should follow the sub-cycle motion of the newly formed electron (as one might for a plasma electron). The ele ctron oscillates in the intense field\, and it can collide with a near-by i on during this motion. In a plasma similar motion leads to inverse Bremsst rahlung\, but in an atomic gas\, high harmonics and attosecond pulses are p roduced provided the collision is between the electron and its parent ion. In this re-collision\, infrared light is converted into much shorter wavel ength light. Thus plasma physics leads us to a new form of extreme nonline ar optics. \nI will describe attosecond pulse generation and measurement i n solids and gases and why it is important. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191212T160000Z DTEND:20191212T173000Z DTSTAMP:20260828T094430Z UID:3fi07ekrv8jiehq7g2uu7o62e4@google.com CREATED:20191202T181120Z DESCRIPTION:Speaker: Matthias Burkardt\n\nTitle: "Transverse Force Tomogra phy"\n\nAbstract: Both the recently upgraded JLab as well as the planned EI C will provide three-dimensional precision snapshots of the quark gluon str ucture of protons and nuclei. While twist-2 Generalized Parton Distribution s (GPDs) allow for a determination of partons in the transverse plane\, twi st-3 GPDs contain quark-gluon correlations that provide information about t he transverse color Lorentz force acting on quarks in a DIS experiments. Th e example the nonforward generalization of the polarized PDF $g_T(x)$ is us ed to illustrate how twist-3 GPDs can provide transverse position informati on about that force. LAST-MODIFIED:20191202T194915Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar\, NMSU TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191203T181500Z DTEND:20191203T191500Z DTSTAMP:20260828T094430Z UID:7d863vjt3ghbq2aocosjiuopiv@google.com CREATED:20190910T141427Z LAST-MODIFIED:20190910T141427Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201026T200000Z DTEND:20201026T210000Z DTSTAMP:20260828T094430Z UID:35991hekbfh8tpcno4ctr3hhjg@google.com CREATED:20200826T165930Z DESCRIPTION:Speaker: \;Rommie Amaro\, \;UC San Diego< b>

    Title: \;ComputationalMicroscopy of SARS-CoV-2< br>
    Abstract: \;
    I will discuss our lab’s efforts\, to gether with collaborators\, to understand the SARS-CoV-2 virusin atomic det ail\, with the goals to better understand molecular recognition ofthe virus and host cell receptors\, antibody binding and design\, and the searchfor novel therapeutics.

    Topic: Biophysics Seminar
    Time: Oct 26\, 2020 04: 00 PM Eastern Time (US and Canada) \;  \;
    Join Zoom Meeting
    https://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN 0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889     LAST-MODIFIED:20200922T142635Z LOCATION:Online Seminar -- Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191104T110000 DTEND;TZID=America/New_York:20191104T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191104T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Focusing light in space and time \n\nSpeaker: Ivar Marti n\, Argonne\n\n\nAbstract: Redirecting and focusing light in space is basic technology behind eyeglasses and telescopes. The optical elements -- lense s or mirrors – are static on the time scale relevant to the waves and thus do not change the color (frequency) of the waves. \n\nWhat if the optical elements were allowed to change in time\, fast? Now frequency can change\, but more interestingly\, it becomes possible to focus waves not only in sp ace but also in time\, with the energy compressed in short pulses. This is the physics underlying pulsed lasers\, capable of generating femto-second s hort pulses.\n\nIn lasers\, external pumping (gain) is required in order co mpensate for significant losses typical of an active optical medium. In con trast\, in microwave regime\, by using superconducting resonators it is pos sible to dramatically suppress losses\, with the cavity finesse reaching bi llions. In combination with superconducting qubits\, this enables new quant um information storage and manipulation techniques. Rapid periodic variati on of parameters\, similar to pulsed lasers\, is also possible. We show th at in this nearly lossless regime\, short pulses can be generated without e xternally provided gain. Such manipulation can be used to temporally compre ss and decompress signals and create highly entangled quantum states of pho tons.\n\nWhen starting from quantum vacuum\, parametric pumping can focus z ero-point fluctuations into pulses\, while depleting them elsewhere. Such exotic light focusing can be interpreted in terms of emergent space-time me tric that contains event horizons. \n\nRefs:\n\nIvar Martin\, Annals of Phy sics Volume 405\, June 2019\, Pages 101-129\n\nZ. Huang\, A. Clerk\, I. Mar tin\, unpublished (2019) LAST-MODIFIED:20191022T180442Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190211T213000Z DTEND:20190211T223000Z DTSTAMP:20260828T094430Z UID:4qq2eh37nkr3vb3ui5m641dnrv@google.com CREATED:20190130T185726Z DESCRIPTION:Title: Magnetic reconnection driven particle acceleration in ma croscale systems: implications for the Parker Solar Probe mission\n\nSpeake r: J. F. Drake\, University of Maryland\n\nAbstract: A novel MHD/kinetic mo del is being developed to explore magnetic reconnection and particle energi zation in macro-scale systems such as the solar corona. The model blends th e MHD description with a\nmacro-particle description. The rationale for thi s model is based on the recent discovery that energetic particle production during magnetic reconnection is controlled by Fermi reflection and Betatro n acceleration and not parallel electric fields. Since the former mechanism s are not dependent on kinetic scales such as the Debye\nlength and the ele ctron and ion inertial scales\, a model that sheds these scales is sufficie nt for describing particle acceleration in macro-systems. Our MHD/kinetic m odel includes macroparticles laid out on an MHD grid that are evolved with the MHD fields. Crucially\, the feedback of the energetic component on the MHD fluid is included in the dynamics. Thus\, energy of the total system\, the MHD fluid plus the energetic component\, is conserved. The system has n o kinetic scales and therefore can be implemented to model energetic partic le production in macro-systems with none of the constraints associated with a particle-in-cell (PIC) model. The new model has been benchmarked by stud ying the propagation of Alfven waves and the growth of firehose modes in a system with anisotropic electron pressure. The talk will emphasize the phys ics basis for particle acceleration during magnetic reconnection and how th is leads to the new model. The prospects for benchmarking this new particle acceleration model with results with solar flare observations and the data from the Parker Solar Probe Mission will be discussed.\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20190208T174534Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190422T110000 DTEND;TZID=America/New_York:20190422T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190422T110000 CREATED:20190122T184735Z DESCRIPTION:Title: To catch and reverse a quantum jump mid-flight\n\nSpeake r: Zlatko Minev\, IBM\n\nAbstract: Quantum physics was invented to account for two fundamental features of measurement results -- their discreetness a nd randomness. Emblematic of these features is Bohr's idea of quantum jumps between two discrete energy levels of an atom. Experimentally\, quantum ju mps were first observed in an atomic ion driven by a weak deterministic for ce while under strong continuous energy measurement. The times at which the discontinuous jump transitions occur are reputed to be fundamentally unpre dictable. Can there be\, despite the indeterminism of quantum physics\, a p ossibility to know if a quantum jump is about to occur or not? Here\, we an swer this question affirmatively by experimentally demonstrating that the j ump from the ground to an excited state of a superconducting artificial thr ee-level atom can be tracked as it follows a predictable "flight\," by moni toring the population of an auxiliary energy level coupled to the ground st ate. The experimental results demonstrate that the jump evolution when comp leted is continuous\, coherent\, and deterministic. Furthermore\, exploitin g these features and using real-time monitoring and feedback\, we catch and reverse a quantum jump mid-flight\, thus deterministically preventing its completion. Our results\, which agree with theoretical predictions essentia lly without adjustable parameters\, support the modern quantum trajectory t heory and provide new ground for the exploration of real-time intervention techniques in the control of quantum systems\, such as early detection of e rror syndromes\n\nHost- Vlad Manucharyan LAST-MODIFIED:20190321T123553Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200928T200000Z DTEND:20200928T213000Z DTSTAMP:20260828T094430Z UID:0jn7mc3qs77n09gt6nafidm8k4@google.com CREATED:20200909T142901Z DESCRIPTION:Speaker: Dr. N icholas Butch


    Title: Career Speaker Series
    About: \;< br>Dr. Nicholas Butch will be discussing his career trajectory from the per spective of working for a national lab.

    The Career Speaker Series is meant to give advice to junior scientist on what their choices are\, how l ife works after grad school\, what scientific careers are out there.

    Zoom Link \; &\;  \; \;Log In Information


    https://umd.zoom.us/s/91198037643

    Meeting ID: 911 9803 7643 \;

    Password:558484 \;

    LAST-MODIFIED:20200909T200437Z LOCATION:Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar CAREER Speaker: Nicholas Butch\, NIST TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190227T160000Z DTEND:20190227T170000Z DTSTAMP:20260828T094430Z UID:3gnhn9bhfh8rbq7e7mjtt6r4li@google.com CREATED:20190205T161751Z LAST-MODIFIED:20190205T161751Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191211T190000Z DTEND:20191211T210000Z DTSTAMP:20260828T094430Z UID:42m5isu4qbfh3mftdkoao7p5i7@google.com CREATED:20191001T180141Z DESCRIPTION:Ben Nachman\, LBNL

    Preceeded by lunch at 12:30

    Title: Modeling final state radiation on a quantum computer


    Ab stract: Particles produced in high energy collisions that are charged under one of the fundamental forces will radiate proportionally to their charge\ , such as photon radiation from electrons in quantum electrodynamics. At su fficiently high energies\, this radiation pattern is enhanced collinear to the initiating particle\, resulting in a complex\, many-body quantum system . Classical Markov Chain Monte Carlo simulation approaches work well to cap ture many of the salient features of the shower of radiation\, but cannot c apture all quantum effects. We show how quantum algorithms are well-suited for describing the quantum properties of final state radiation. In particul ar\, we develop a polynomial time quantum final state shower that accuratel y models the effects of intermediate spin states similar to those present i n high energy electroweak showers. The algorithm is explicitly demonstrated for a simplified quantum field theory on a quantum computer. Time permitt ing\, I will discuss how techniques from high energy physics can also impro ve measurements on quantum computers using unfolding algorithms. See 1904.0 3196\, 1910.00129\, and 1910.01969 for details.

    Slides LAST-MODIFIED:20191213T155507Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMD/ JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200914T200000Z DTEND:20200914T213000Z DTSTAMP:20260828T094430Z UID:0l6dn00akrftho0pmk06i81gi1@google.com CREATED:20200909T175226Z DESCRIPTION:Speaker: Dr. Johnpierre Pagli one

    Dr. Paglione will be giving an overview of the PHYS 838C Sem inar. \;

    Zoom Link \; \;&\; Meeting Info
    https://umd.zoom.us/s/91198037643< br>Meeting ID: 911 9803 7643 \;
    Password:558484 LAST-MODIFIED:20200909T200351Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS 838C Seminar: Johnpierre Paglione\, UMD TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191002T150000Z DTEND:20191002T160000Z DTSTAMP:20260828T094430Z UID:562o2b9gkl22lhggsfo95nqoqp@google.com CREATED:20190903T165746Z DESCRIPTION:Speaker: Jason Tran\, Graduate Student\, UMD\, Department of Ch emistry and Biochemistry\n\nTitle: Laser-Induced Single Nanoparticle Trappi ng with Optical Tweezers (Literature seminar)\n\nAbstract: The ability to m ove very small particles/objects in a non-destructive manner has high appli cations to the biology with DNA and cells\, quantum chemistry and material science with quantum dots and semiconductors\, and particle physics. Nanop articles can be manipulated with nanometer precision and without mechanical damage using optical tweezers. This technique has been continually refined to trap smaller and smaller particles with lower and lower laser intensiti es through the combination of other techniques such as the introduction to plasmonics and self-induced back action. LAST-MODIFIED:20190925T150444Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160829T110000 DTEND;TZID=America/New_York:20160829T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20160829T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Aditi Mitra\, New York University\n\nTitle: Entangleme nt dynamics following quantum quenches\n\nAbstract: Recent years have shown that entanglement is a useful\nway to characterize quantum many body syste ms\, however\nconcrete results only exist in one spatial dimension.\nIn thi s talk I will present results for the dynamics of the\nentanglement entropy and entanglement spectra in two dimensional \nFloquet Chern insulators re alized by applying a time-periodic perturbation \nto graphene. I will show how the topological edge states manifest in the \nentanglement dynamics and highlight some surprising differences between \ntopological insulators rea lized from static Hamiltonians and those realized from \ntime-periodic Hami ltonians. If time permits\,I will also discuss entanglement dynamics \nfoll owing a critical quench in three spatial dimensions\, and show how the unde rlying \ncritical exponents manifest in the entanglement dynamics. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Entanglement dynamics following quantum quenches TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190311T200000Z DTEND:20190311T210000Z DTSTAMP:20260828T094430Z UID:35odtuuts0c9lfsb6tuuursp2d@google.com CREATED:20190118T170330Z DESCRIPTION:Title: Negative Reciprocity\, Not Ordered Assembly\, Underlies the Interaction of Sox2 and Oct4 on DNA\n\nSpeaker: John Biddle\, Harvard U niversity\n\nNotes: http://marylandbiophysics.umd.edu/seminars/\n\nAbstract : \n\nSingle-molecule data on the transcription factors Sox2 and Oct4 publi cation five years ago as evidence of ordered assembly on DNA. The quantity cited in support of this conclusion\, however\, is not a measure of ordere d assembly. Moreover\, these single-molecule experiments aim to infer what takes place at DNA binding loci by following transcription factors\, and t his inference requires a more in-depth biophysical analysis than had been c arried out. We performed such an analysis and did not find support for the hypothesis of ordered assembly\, but we did find something novel: that the expression of Sox2 in these cells increased genomic binding by Oct4\, whil e the expression of Oct4 decreased genomic binding by Sox2. We call this s urprising phenomenon “negative reciprocity”\, and show that it cannot be ac counted for at thermodynamic equilibrium with only one kind of Sox2-Oct4 bi nding loci. Either the cell must expend energy so as to maintain the syste m away from thermodynamic equilibrium\, or Sox2 and Oct4 must bind at diver se genomic loci in such a way that at some of these loci they assist each o ther in binding\, while at others they hinder each other. The analytical t echniques used to derive these results are of general interest\, and increa singly so as single-molecule tracking techniques continue to develop. LAST-MODIFIED:20190219T182907Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191017T180000Z DTEND:20191017T190000Z DTSTAMP:20260828T094430Z UID:11tu1s733v7khfg9i98pjssgcj@google.com CREATED:20190926T163114Z DESCRIPTION:Title: The Unprecedented Thermoelectric Properties of Nodal Sem imetals in a Magnetic Field\nSpeaker: Brian Skinner\, Ohio State University \n\nAbstract:\nThe thermoelectric effect is a phenomenon in which a tempera ture difference applied to a conducting material induces a voltage differen ce. This effect has a range of important applications\, since it allows on e to convert waste heat into useful electric power. In conventional metals and semiconductors\, however\, the strength of the thermoelectric effect fa ces fundamental limitations. In this talk I consider whether these same lim itations apply to the three-dimensional nodal semimetals. I show that\, sur prisingly\, the electron-hole symmetry of nodal semimetals allows for a the rmopower that grows without bound under the application of a strong magneti c field. This nonsaturating thermopower can be understood in terms of quant um Hall-like edge states\, and the corresponding thermoelectric Hall conduc tivity achieves a universal plateau value at large magnetic field. These e ffects have been observed experimentally\, and they may enable the developm ent of thermoelectric devices with record efficiency.\nHost: Yun Suk Eo\n\n Refreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20191016T200215Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Brian Skinner\, Ohio State University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190927T160000Z DTEND:20190927T170000Z DTSTAMP:20260828T094430Z UID:1do3mv5mjld5v3on34p1n93dfi@google.com CREATED:20190923T183001Z DESCRIPTION:Title: Speed limits to quantum thermodynamics\n\nSpeaker: Luis Pedro García-Pintos\n\n(pizza and drinks served 10 min. before talk)\n\nAbs tract: We study the connection between the charging power of a quantum batt ery and the fluctuations of the work stored in the battery. We show that in order to have a non-zero rate of change of the extractable work\, the work fluctuations must be non-zero. This is presented in terms of an uncertaint y relationship that bounds the speed of the charging process of any quantum system. Our findings also identify quantum coherence in the battery as a r esource in the charging process\, which we illustrate on a toy model of a h eat engine. LAST-MODIFIED:20190923T183122Z LOCATION:Location: PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181107T210000Z DTEND:20181107T223000Z DTSTAMP:20260828T094430Z UID:6g51gbck3koh5gjiue6uh9600k@google.com CREATED:20181102T153946Z DESCRIPTION:Title : "Recent Results from the IceCube Neutrino Observatory"\ nSpeaker Name: Erik Blaufuss\nSpeaker Institution : University of Maryland\ n\nAbstract : The IceCube Neutrino Observatory instruments a cubic-kilomete r of glacial ice under the Amundsen-Scott South Pole Station\, Antarctica t o detect neutrinos above ~100 GeV and perform astroparticle observations of the Universe. Astrophysical neutrinos are expected to be created in the bi rthplaces of high-energy cosmic rays\, and point the way back to these elus ive sources. Since IceCube's detection of a diffuse flux of high-energy ast rophysical neutrinos in 2013\, identifying their sources has been the prima ry science goal. This talk with will present the latest measurements of the astrophysical neutrino flux and highlight results from realtime alerts gen erated by astrophysical neutrino detections that trigger rapid follow-up ob servations by the community. Additionally\, IceCube is able to probe fundam ental neutrino properties with the high-statistics atmospheric neutrino sam ples found in the large detector. Potential upgrades to IceCube will also b e discussed\, including the physics potential of a future IceCube-Gen2 faci lity at the South Pole. LAST-MODIFIED:20181102T153947Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190130T173000Z DTEND:20190130T200000Z DTSTAMP:20260828T094430Z UID:0a9bjfghgeuc2aj9p7hovbilvc@google.com CREATED:20190128T154500Z DESCRIPTION:
    Joint Particle theory-ex periment Maryland-Hopkins Seminar


    Seminar will be preceded by lunch at 12:30 pm. Th e talk is from 2:00 to 3:00 pm. Times are tentative.



    Title: Higgs Couplings at High Scales
    < /center>

    Speaker: Tao Han\, University of Pitts burgh

    Abstract: Experiments at the LHC have been improving the measurements of the Higgs boson properties\, and the searches for new physi cs are being actively conducted. In the absence of deviations from the Stan dard Model thus far\, it would be prudent to seek for other complementary s trategies in the experiments at the energy frontier. For this purpose\, we propose to study the Higgs couplings at high energy scales\, relevant to ad dressing the naturalness problem in the Higgs sector. We focus on the energ y scale-dependence of the off-shell Higgs propagation\, and of the top quar k Yukawa coupling. We first present the traditional RGE evolution in the SM and in SUSY\, and show the possible large modifications with the existence of extra dimensions. We discuss threshold effects in the Higgs propagator due to the existence of new states\, such as a gauge singlet scalar\, or po ssible continuum
    states in a nearly conformal sector\, both of which co uld alleviate the hierarchy problem. We finally illustrate the composite Hi ggs scenario by parameterizing the Higgs interactions by a non-local form f actor. We propose to exploit the unique signal process gg ->\; h* ->\; ZZ*. We find that certain scenarios could lead to a potentially observable effect at the LHC upgrade to a high luminosity or higher energy. LAST-MODIFIED:20190129T142523Z LOCATION:Johns Hopkins University\, Bloomberg Hall Rm. 462 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Particle theory-experiment Maryland-Hopkins Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191007T190000Z DTEND:20191007T203000Z DTSTAMP:20260828T094430Z UID:5ame029i0me7j6if8qrgbuoj06@google.com CREATED:20191115T141809Z DESCRIPTION:\n\nTitle: Learning from Dark Monopoles\n\nAbstract: \n Mag netic monopoles appear in many motivated quantum field theories and give el ectromagnetism a suggestive symmetry. As Dirac showed\, magnetic monopoles also explain why electric charges are quantized. This same quantization con dition implies that the monopoles of our familiar electrodynamics have a la rge\, nonperturbative\, coupling to the photon.\n However\, if a dark p hoton with magnetic monopoles has a small mixing with our photon\, then the dark monopoles can develop a small\, perturbative\, magnetic coupling to o ur photon. This provides a theoretical laboratory for learning about the in teractions between electric and magnetic charges in quantum field theory. I explain how to use these types of mixing models to explore these theoretic al questions. I then discuss the phenomenology of these dark monopoles as a fraction of the dark matter. In particular\, I outline how these monopoles can be detected through Aharonov-Bohm phase shifts. LAST-MODIFIED:20191115T141809Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chris Verhaaren\, University of California TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201120T200000Z DTEND:20201120T213000Z DTSTAMP:20260828T094430Z UID:6a35u272lf42j3cfd7qlvq51ll@google.com CREATED:20201112T213001Z DESCRIPTION:Location: Virtual via Zoom

    Title : Searching for Gravita tional Waves with Pulsar Timing Arrays
    Speaker Name: Megan DeCesar
    Sp eaker Institution : GWU/NRL


    Abstract : Pulsar timing arrays (PTA s) are kiloparsec-scale\, nanohertz-frequency gravitational wave (GW) detec tors composed of many millisecond pulsars (MSPs) that are timed over many y ears. Correlated variations in PTA MSPs’ pulse arrival times that are found to be consistent with a quadrupolar signature would indicate the presence of a GW signal in the timing residual data. The most well-known example is the Hellings-Downs correlation for detection of a stochastic\, isotropic GW background (GWB) produced by a population of coalescing supermassive black hole binaries (SMBHBs). GW detection by PTAs requires timing many tens of MSPs spread across the sky with ~10-100 ns timing precision over a long (~d ecades) timing baseline. In this talk\, I will focus primarily on the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) and the International Pulsar Timing Array (IPTA). I will describe the construction of NANOGrav and IPTA datasets and discuss results of GW analyses performed on these data\, with emphasis on the recent 12.5-year and upcoming 15-year NANOGrav datasets. I will also discuss efforts to continually expand the nu mber of MSPs timed by these PTAs\, including improvements in instrumentatio n\, all-sky pulsar surveys\, and targeted searches of MSP-like gamma-ray so urces\, to improve PTAs’ sensitivity to both a GWB and individual continuou s-wave sources.

    Host Name: John Cullinan
    Host E-Mail: \;jcullina@umd.edu LAST-MODIFIED:20201112T213001Z LOCATION:Please contact John Cullinan at jcullina@umd.edu for zoom informat ion. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181010T150000Z DTEND:20181010T163000Z DTSTAMP:20260828T094430Z UID:13dt0eq3s4pg8h7r0ulsv2s9ba@google.com CREATED:20180924T185704Z LAST-MODIFIED:20180924T185704Z LOCATION:3100A: QuICS Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:3100A: QuICS Seminar-Ingo Roth TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190201T170000Z DTEND:20190201T174000Z DTSTAMP:20260828T094430Z UID:65mttgkggjikd1shci3g4rcl72@google.com CREATED:20190129T190010Z DESCRIPTION:Title: Bang-bang control as a design principle for classical an d quantum optimization algorithms\n\nSpeaker: Aniruddha Bapat\, QuICS/JQI\n \nAbstract: Physically motivated classical heuristic optimization algorithm s such as simulated annealing (SA) treat the objective function as an energ y landscape\, and allow walkers to escape local minima. It has been argued that quantum properties such as tunneling may give quantum algorithms advan tage in finding ground states of vast\, rugged cost landscapes. Indeed\, th e Quantum Adiabatic Algorithm (QAO) and the recent Quantum Approximate Opti mization Algorithm (QAOA) have shown promising results on various problem i nstances that are considered classically hard. In this talk\, I argue that the type of control strategy used by the optimization algorithm may be cruc ial to its success. Along with SA\, QAO and QAOA\, I will introduce a new\, bang-bang version of simulated annealing\, BBSA\, and compare the performa nce of these algorithms on two well-studied problem instances from the lite rature. Both classically and quantumly\, the successful control strategy is found to be bang-bang\, exponentially outperforming the quasistatic analog ues on the same instances. Lastly\, I will show O(1)-depth QAOA protocols f or a class of Hamming symmetric cost functions\, and provide an accompanyin g physical picture.\n\nReference: https://arxiv.org/abs/1812.02746\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190129T192229Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190212T193000Z DTEND:20190212T210000Z DTSTAMP:20260828T094430Z UID:0sfu68mlmvbpupu87o6fqcpiv4@google.com CREATED:20190211T160630Z DESCRIPTION:Speaker: Nima Arkani-Hamed\, IAS\n\nTitle: Elementary Positive Geometry of Causal Diamonds\, Particles and Strings LAST-MODIFIED:20190211T160630Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Speaker TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201023T160000Z DTEND:20201023T164500Z DTSTAMP:20260828T094430Z UID:3iv0r3sh9fmospu6iucg202etu@google.com CREATED:20201014T144616Z DESCRIPTION:Title : Extraction of many-body Chern number from a single wave function
    Speaker : Hossein Dehghani
    Time : \;12 - 12:45pm\, Friday\, Oct. 23

    Seminar will be hel d via Zoom: \;https://umd.z oom.us/j/97099328991 \;and Meeting ID : 970 9932 8991

    The quantized Hall conductivity of integer and fractional quantum Hall (IQ H and FQH) states is directly related to a topological invariant\, the many -body Chern number. The conventional calculation of this invariant in inter acting systems requires a family of many-body wave functions parameterized by twist angles in order to calculate the Berry curvature. In this work\, w e demonstrate how to extract the Chern number given a single many-body wave function\, without knowledge of the Hamiltonian. We perform extensive nume rical simulations involving IQH and FQH states to validate these methods. W e also propose an ancilla-free experimental scheme for the measurement of t his invariant. Specifically\, we use the statistical correlations of random ized measurements to infer the MBCN of a wavefunction. LAST-MODIFIED:20201014T144944Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Friday Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191126T141500Z DTEND:20191126T151500Z DTSTAMP:20260828T094430Z UID:3odl40lkpe06gbjrdbt3kh0dah@google.com CREATED:20190910T141359Z LAST-MODIFIED:20191127T130018Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191107T123000 DTEND;TZID=America/New_York:20191107T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191107T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Nonlinear and quantum phenomena in whispering-gallery mo de crystalline resonators\nSpeaker: Yanne Chembo\nUMD | ECE and IREAP\n\nAb stract: Whispering-gallery mode (WGM) resonators are disks\, toroids or sph eres with micro- or millimetric radius and (sub-)nanometer surface roughnes s. They have the capability to trap laser light by total internal reflectio n for a duration higher than a microsecond. In these ultra-high Q resonator s\, the small volume of confinement\, high photon density and long photon l ifetime ensures a very strong light-matter interaction\, which may excite t he WGMs through various nonlinear effects\, namely Kerr\, Raman\, or Brillo uin. Quantum phenomena such as twin-photon generation\, entanglement\, and squeezing can also occur in these optical cavities. In this talk\, we discu ss some of the main challenges related to the understanding of nonlinear an d quantum phenomena in WGM resonators\, and present as well as some of the principal applications in aerospace and communication engineering. LAST-MODIFIED:20191028T202002Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190403T200000Z DTEND:20190403T213000Z DTSTAMP:20260828T094430Z UID:2rk10lovuomp0g6rv2mom8ji94@google.com CREATED:20190329T171329Z DESCRIPTION:Title : Higgs Boson Width at the LHC\n\nSpeaker: Luigi Marchese \, Oxford University\n \nAbstract : In the Standard Model the Higgs boson i s a very narrow resonance and therefore measuring its width is challenging. How can we constrain the Higgs boson total width at the LHC? Presently\, t he best limits on the Higgs boson total width at the LHC are set using the off-shell Higgs production and decay to ZZ in the four-lepton or two-lepton -two-neutrino final state. A review of all measurements performed by the AT LAS collaboration with Run 1 data and Run 2 data collected in 2015 and 2016 is presented. LAST-MODIFIED:20190329T171340Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190206T180000Z DTEND:20190206T190000Z DTSTAMP:20260828T094430Z UID:28ilglp6t2bfjfeodtj9uafvbb@google.com CREATED:20190129T144503Z DESCRIPTION:Speaker: University of Maryland School of Pharmacy

    Title: America's Got Regulatory Science Talent Competition

    Abstrac t: Students at the Baltimore and College Park campuses of the University of Maryland are invited to participate in a competition! The competition aims to promote student interest in regulatory science – the science of develop ing new tools\, standards and approaches to assess the safety\, efficacy\, quality and performance of FDA-regulated products.

    The competition i nvolves each team developing and presenting a proposed solution to a curren t opportunity in regulatory science. There are numerous needs in regulatory science. Students should consult the FDA Center/Office Regulatory Science Research Priority Areas for the CERSI Program.

    A team can include ei ther an individual or any number of students\, although each team member ha s to contribute to the proposed solution or the presentation. The presenta tion must be 5 minutes in duration or less. It may be as simple as a verbal description or may utilize AV materials. Creativity is encouraged. Propose d solutions should also aim to have high regulatory impact. Each presentati on will be followed by 2 minutes of Q&\;A. LAST-MODIFIED:20190131T143321Z LOCATION:Pharmacy Hall\, 20 Pine Street\, Baltimore\, MD 21201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200629T190000Z DTEND:20200629T200000Z DTSTAMP:20260828T094430Z UID:10udmvlk9qu4br63im8hhuc3rk@google.com CREATED:20200609T173719Z DESCRIPTION:Seminar to be conducted via Zoom

    Preceded by Zoom lunch at 1pm

    Speaker: Adam Falkowski\, University of Paris-Saclay

    T itle:
    Constraints on new physics from nuclear beta transitions

    Ab stract:
    Precision measurements are an integral part of particle physics. They
    are essential for determining free parameters of the Standard Mode l
    (SM)\, and also for searching for signals of new physics beyond the SM .
    Apart from collider results from LEP\, Tevatron\, and the LHC\, the
    increasing role is being played by precision measurements performed at
    much lower energies\, well below the weak scale. In this talk I will
    rev iew the place of nuclear beta transitions in this programme. Thanks
    to t he improving accuracy of experiment\, theory\, and lattice
    calculations\ , the precision level of beta transitions is reaching
    order 10^-4 in som e cases. In particular\, the so-called superallowed
    beta transitions giv e currently the most precise determination of the
    Vud parameter in the C KM matrix. I will describe the wide spectrum of
    current and planned expe riments\, and how they improve our
    understanding of the SM and non-SM ph ysics.

    Seminar Slides LAST-MODIFIED:20200720T152033Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200220T153000 DTEND;TZID=America/New_York:20200220T163000 DTSTAMP:20260828T094430Z UID:0s7ms3ct4sb3ojumcormsgv5jm@google.com RECURRENCE-ID;TZID=America/New_York:20200220T153000 CREATED:20200213T164329Z DESCRIPTION:Kitaev's 10-fold way (cont'd) - RIT on Geometr y and Physics

    Speaker: Eric Kuo (UMD Physics)

    More on Kitaev's paper https://arxiv.org/abs/0901.2686. LAST-MODIFIED:20200213T174610Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201113T170000Z DTEND:20201113T180000Z DTSTAMP:20260828T094430Z UID:6su0ecdoud1gpcrj1k3687umll@google.com CREATED:20201104T205434Z DESCRIPTION:
    Speaker : Caroline Figgatt (Honeywell)
    Time : \;12 - 1pm\, Friday\, Nov. 13

    Seminar will be held via Zoom:  \;https://umd.zoom.us/j/9709932 8991 \;and Meeting ID : 970 9932 8991


    Carol ine Figgatt is an atomic physicist working to develop ion trap quantum comp uters at Honeywell Quantum Systems. She completed her PhD in physics at the University of Maryland in 2018\, where she built a programmable ion trap q uantum computer and demonstrated a variety of quantum algorithms on it. For her dissertation\, she performed the first parallel 2-qubit operations in a single chain of trapped ion qubits. She will talk about quantum re search at the company\, highlight what it's like to work at Honeywell\, and hold a Q&\;A.     LAST-MODIFIED:20201105T171808Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200304T160000Z DTEND:20200304T170000Z DTSTAMP:20260828T094430Z UID:7e6dd5jatknlqmrt1q55cdl385@google.com CREATED:20200122T143011Z LAST-MODIFIED:20200224T143449Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190410T160000Z DTEND:20190410T170000Z DTSTAMP:20260828T094430Z UID:638hl8du0pv7h96j296v893hm9@google.com CREATED:20190402T135629Z DESCRIPTION:Title: Lunch &\; Learn - Materials Science and Chemical Engi neering Majors

    Abstract: All undergraduate engineering students are invited to join the Office of Advanced Engineering Education (OAEE) for “Lu nch &\; Learn” information sessions\, throughout Spring 2019. These even ts will provide an overview of the options available within UMD’s Professio nal Master of Engineering programs\, tailored specifically to students in y our major. Take advantage of the opportunity to learn about the admissions process\, and see how you can advance your education and career through our academic programs. Lunch will be provided.

    Registration is required ! Visit \; http://go.umd.edu/UXR or contact Anna Damm at adamm1@umd.edu. \; LAST-MODIFIED:20190402T140016Z LOCATION:Kim Engineering Building\, Kay Boardrooms 1 & 2 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Chemical Engineering Majors TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200306T170000Z DTEND:20200306T174000Z DTSTAMP:20260828T094430Z UID:4v5dd5p6uv0fuqcq83cpsprvae@google.com CREATED:20200304T140834Z DESCRIPTION:Title: \;Quantum Optics with Rydberg Superatoms
    S peaker:Jan Kumlin

    Institute for Theoretical Physics III and Center for In tegrated Quantum Science and Technology\, University of Stuttgart\, Germany

    (pizza and drinks served at 12pm\; talk starts at 12:10pm)

    Abs tract: The interaction of a single photon with an individual two-level syst em is the textbook example of quantum electrodynamics. Achieving strong cou pling in this system has so far required confinement of the light field ins ide resonators or waveguides. Experiments with Rydberg superatoms [1\,2] ha ve demonstrated the ability to realize strong coupling to a propagating lig ht pulse containing only a few photons in free space. In this talk\, we wil l present the exact input-output formalism to describe the phenomenon of co llective Rabi oscillations in a single Rydberg two-level superatom coupled to a photon field. The photonic mode then defines an effective one-dimensio nal system\, while the large size of the atomic cloud provides a chiral cou pling. Extending the theory to describe several atoms coupled to a one-dime nsional waveguide also provides an approach to investigate coherent interna l dynamics of the atomic cloud by the exchange of virtual photons [3]. We w ill also show how this approach can be used to describe electromagnetically induced transparency and slow light.


    [1] A. Paris-Mandoki et al.\, Phys. Rev. X 7\, 41010 (2017)

    [2] N. Stiesdal et al.\, P hys. Rev. Lett. 121\, 103601 (2018)

    [3] J. Kumlin et al.\, Phy s. Rev. Lett. 121\, 013601 (2018)

    LAST-MODIFIED:20200304T140834Z LOCATION:ATL 2324\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200908T150000Z DTEND:20200908T160000Z DTSTAMP:20260828T094430Z UID:139uj9ue6o0s0eegcout4t05q4@google.com CREATED:20200904T153931Z DESCRIPTION:Speaker: Andrea Young (UC Santa Barbara) \n\nTitle: Orbital mag netism and an isospin Pomeranchuk effect in twisted bilayer graphene.\n\nAb stract: Moire flat bands host a wide range of correlated states at low temp eratures. My talk will focus on the role of orbital magnetism in these syst ems\, in which the electron system spontaneously polarizes into one or more spin- and valley-isospin flavors. In the first part of the talk\, I will focus on the observation of quantized anomalous Hall effects in a variety o f moire systems. In this spectacular manifestation of orbital magnetism\, the ground state at certain integer filling factors is spontaneously polari zed into a single valley-projected moire miniband\, leading to robust magne tic hysteresis and a quantized Hall effect at zero magnetic field. We obs erve a variety of novel phenomena in this regime\, including ultra-low powe r current induced switching and gate-tuned reversal of magnetic order that can be tied to the magnetization of the topological edge states. In the se cond part of the talk\, I will discuss the more general role orbital magnet ism plays in the phase diagram of these materials at high temperatures. In particular\, we find that even when the ground state is isospin unpolarized \, a finite polarization can obtain at high temperatures. We ascribe this effect--observed generically in twisted bilayer graphene--to an isospin ana logue of the Pomeranchuk effect of 3He\, in which the high entropy associat ed with isospin excitations of the orbital magnets favors fluctuating magne tic order at high temperatures. \n\n\nEmail Rcawthor@umd.edu for Zoom detai ls LAST-MODIFIED:20200908T181453Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190816T150000Z DTEND:20190816T160000Z DTSTAMP:20260828T094430Z UID:6mhbdtk60i1dq69dhifghfislb@google.com CREATED:20190805T175737Z DESCRIPTION:Special JQI/QuICS seminar\n\nAug 16\, 2019\n11am\, PSC 2136 \n\ nVictor Albert\, Caltech\n\nEncoding a qubit in a molecule\n\nQuantum error -correcting codes are constructed that embed a finite-dimensional codespace in the infinite-dimensional Hilbert state space of the rotational degrees of freedom of a rigid body. Such codes allow for protection against diffusi on in the body’s orientation as well as small kicks in the body’s angular m omentum. We mention realizations of the logical states of such codes in mol ecules\, atomic ensembles\, and nanoparticles. Such states are part of a “p artially Fourier-transformed” basis that interpolates between the position and momentum bases of the system. The idea of using elements of such a basi s for error correction turns out to be generally relevant\, allowing for a unified treatment of our rigid body codes\, qudit Calderbank-Shor-Steane co des\, and oscillator Gottesman- Kitaev-Preskill codes. LAST-MODIFIED:20190805T175827Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI/QuICS seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200917T204500Z DTEND:20200917T214500Z DTSTAMP:20260828T094430Z UID:0nff12ku54aq9ksq0s5584edpq@google.com CREATED:20200911T005523Z DESCRIPTION:
    Alexey Gorshkov

    Colloquium at the \;Homer L. Dod ge Department of Physics and Astronomy at The University of Oklahoma

    Title: Dynamics of quantum systems with long-range interactions

    Abs tract: Atomic\, molecular\, and optical systems often exhibit long-range in teractions\, which decay with distance r as a power law 1/r^alpha. In this talk\, we will discuss bounds on how quickly quantum information can propag ate in such systems. We will then discuss applications of these bounds to n umerous phenomena including classical and quantum simulation of quantum sys tems\, prethermal phases in Floquet systems\, entanglement area laws\, samp ling complexity\, and scrambling.


    For the Zoom link to this talk \, please contact \;gorshkov@umd.edu< /a> LAST-MODIFIED:20200911T012507Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Virtual Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190313T150000Z DTEND:20190313T160000Z DTSTAMP:20260828T094430Z UID:21oln7507uhlvpffqmbnv5bolr@google.com CREATED:20190205T161850Z LAST-MODIFIED:20190205T161920Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar Series - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191010T150000Z DTEND:20191010T163000Z DTSTAMP:20260828T094430Z UID:5ha2k1sqnck166ja5klbuhvrfu@google.com CREATED:20190820T185649Z DESCRIPTION:Speaker: Niklas Mueller\, BNL\n\nTitle: Deeply inelastic scatte ring structure functions on a hybrid quantum computer\n\nAbstract: We outli ne a strategy to compute deeply inelastic scattering structure functions us ing a hybrid quantum computer. Our approach takes advantage of the represen tation of the fermion determinant in the QCD path integral as a quantum mec hanical path integral over 0+1-dimensional fermionic and bosonic worldlines . The proper time evolution of these worldlines can be determined on a quan tum computer. While extremely challenging in general\, the problem simplifi es in the Regge limit of QCD\, where the interaction of the worldlines with gauge fields is strongly localized in proper time and the corresponding qu antum circuits can be written down. As a first application\, we employ the Color Glass Condensate effective theory to construct the quantum algorithm for a simple dipole model of the F2structure function. We outline further h ow this computation scales up in complexity and extends in scope to other r eal-time correlation functions.\n\nIf time permits\, I will also discuss an other interesting application for QIS\, where we study the real-time dynami cs of a prototype model for CP-violation\, the massive Schwinger model with a θ term. We identify dynamical quantum phase transitions between differen t topological sectors in this model which persist at string coupling and ma y be accessed with table-top experiments based on existing cold-atom\, supe rconducting-qubit\, and trapped-ion technology. LAST-MODIFIED:20191004T135434Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Speaker TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190225T213000Z DTEND:20190225T223000Z DTSTAMP:20260828T094430Z UID:4v59es4la6kv3depm3cgg2qvv0@google.com CREATED:20190124T010231Z DESCRIPTION:Title: IMAGINE'ing Galactic Magnetic Fields and Ultra-High Ener gy Cosmic Rays\n\nSpeaker: Tess Jaffe\, NASA Goddard Space Flight Center\n\ nAbstract: The Galactic magnetic field (GMF) plays an important role in a v ariety of astrophysical processes but is not well understood. Magnetic fiel ds in the interstellar medium are difficult to study directly but affect ph enomena as diverse as: the propagation of cosmic rays\; the formation of st ars\; the morphology of supernova remnants\; the deflections in the arrival directions of extragalactic ultra-high energy cosmic rays (UHECRs)\; the c osmic microwave background (CMB). I will review how data across the electro magnetic spectrum are giving us new and different views of the fields - for example\, polarized dust emission from Planck\, or anisotropies in the arr ival directions of UHECRs seen with Auger or IceCube -- and how these data are difficult to interpret because of the complexity of the different conte xts and the degeneracies in the parameter space. The Interstellar MAGnetic field INference Engine (IMAGINE) is our new framework for combining all ava ilable observables as well as theoretical knowledge into a statistically ri gorous Bayesian analysis. This will allow us to incorporate *all* available information to break some of these degeneracies as well as to explicitly q uantify how well different models reproduce the same observables with the B ayesian evidence. I will summarize the project\, the infrastructure we have made publicly available\, and our plans to build more realistic GMF models based on magneto-hydrodynamical dynamo equations and to attempt both param etric and non-parametric reconstructions of the GMF.\n\nNotes: Coffee\, Tea & Snacks 4:15-4:30 PM LAST-MODIFIED:20190124T010231Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191029T160000 DTEND;TZID=America/New_York:20191029T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191029T160000 CREATED:20190530T191015Z DESCRIPTION:\nSpeaker: Dan Lathrop\, Distinguished Scholar-Teacher Lecture \n\nTitle: Machine Learning and the Scientific Method\n\n\nAbstract:\nScien ce is now performed with people and computers working together on many if n ot most of our tasks. Outside of academia\, machine learning tools (voice r ecognition\, image recognition\, etc.) permeate our lives through the techn ology we use. Those machine learning tools are also undergoing widespread a doption into scientific exploration. In this talk\, I will try to tackle a few puzzling questions: machine learning -- what is it / what is it not? T he scientific method -- what is it / what is it not? And finally: is machi ne learning a scientific method? Along the way we will make stops at variou s curious and interesting corners such as the meaning of understanding\, cr eativity\, the double-pendulum\, the three-body problem\, neurodiversity\, and how people pick the scientific projects. LAST-MODIFIED:20191022T165426Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191011T170000Z DTEND:20191011T180000Z DTSTAMP:20260828T094430Z UID:5rosd5hf1fua588jr5gpeq5uge@google.com CREATED:20190905T133451Z DESCRIPTION:Speaker: Dr. Joseph Hereman\, Professor\, MSSE & Physics\, The Ohio State University\n\nTitle: TBD\n\nAbstract: TBD LAST-MODIFIED:20190905T133451Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200929T171500Z DTEND:20200929T181500Z DTSTAMP:20260828T094430Z UID:4fpniqhv7hr5uh8ionb8tshtgc@google.com CREATED:20200917T181000Z DESCRIPTION:Speaker: Andrew Jordan\, University of Rochester

    Title: Continuous Quantum Measurement and the Arrow of Time

    Abstract: \ ;I will describe recent advances in the science of quantum control and meas urement that have allowed measurement of the dynamics of the quantum state for single continuous measurement realizations. Recent results linking the collapse of the wave function to the arrow of time will be described\, draw ing on closely related phenomenon in the field of non-equilibrium statistic al physics. I will discuss two new experiments probing this behavior in sup erconducting circuits and in cold atomic gases. \; \;

    ZOOM:& nbsp\;    https://umd.zoom.us/j/98477648942?pwd=VWlqZWJlYkVCaERqQVp5cXNlV 2hVQT09 LAST-MODIFIED:20200923T154236Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191003T123000 DTEND;TZID=America/New_York:20191003T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191003T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Can we use future observations to improve current foreca sts without cheating?\nSpeaker: Eugenia Kalnay\nUniversity of Maryland | De partment of Atmospheric and Oceanic Science\n\nAbstract: Co-authored with T se-Chun Chen and Daisuke Hotta. The National Weather Service computes opera tional weather forecasts using a process called “data assimilation”: A 6 ho ur forecast is computed starting from the current “analysis”. The 6 hour fo recast is then optimally combined with the observations collected 6 hours l ater to create the new analysis which serves as initial conditions for the next forecast. This process\, known as “analysis cycle”\, is repeated every 6 hours. Miyakoda (personal communication\, ~1980) pointed out that using any future information to improve current forecasts should be considered “c heating” because it cannot be done in operational forecasting. Chen (2018\, PhD thesis)\, Chen and Kalnay (2019a) MWR\, and Chen and Kalnay (2019b\, u nder review)\, developed an application of Ensemble Forecast Sensitivity to Observations (EFSO\, Kalnay et al.\, 2012\, Tellus) combined with Proactiv e Quality Control (PQC\, Hotta et al.\, 2017). It uses future data (e.g.\, observations obtained 6 hours after the present analysis) to identify and d elete current detrimental observations (in the present analysis). We found that making a late correction of every current analysis after the new obser vations have been received\, accumulates improvements with time. The accumu lated improvement is found to be much larger than the last correction that cannot be used in order to avoid cheating\, so that forecasts are significa ntly improved “without cheating”. LAST-MODIFIED:20190829T144451Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190225T200000Z DTEND:20190225T213000Z DTSTAMP:20260828T094430Z UID:5mr27ckfs4sps668p47ii31b7o@google.com CREATED:20190128T172845Z DESCRIPTION:

    Jessica Turner\, Fermilab

    Title: Searching for flavour symmetries: old data new tricks
    Abstract: The observed pattern of mixing in the neutrino sector may be explained by the
    pr esence of a non-Abelian\, discrete flavour symmetry broken into residual
    sub groups at low energies. These flavour models require the presence of
    Standar d Model singlet scalars\, namely flavons\, which decay to charged leptons
    in a flavour-conserving or violating manner. In this talk\, I will present th e constraints on \;
    the model parameters of an A4 leptonic flavour model using a synergy of
    g-2\, charged lepton flavour conversion and collider dat a. The most powerful constraints derive from the MEG collaboration's result and the reinterpretation of an 8 TeV ATLAS search for anomalous production s of multi-leptonic final states.

    LAST-MODIFIED:20190213T145507Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181025T123000 DTEND;TZID=America/New_York:20181025T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181025T123000 CREATED:20180827T142930Z DESCRIPTION:Title: A method for numerical computation starting from a quasi periodic trajectory (Room change: AV Williams 1147)\nSpeaker: Prof. Evelyn Sander\nGeorge Mason University Department of Mathematics\n\nAbstract: A tr ajectory is quasiperiodic if the trajectory lies on and is dense in some d- dimensional torus\, and there is a choice of coordinates on the torus for w hich F has the form of a rigid rotation on the torus with rotation vector r ho. There is an extensive literature on determining the rotation vector ass ociate with F\, as well finding Fourier components to establish these conju gacies. I will present two new methods with very good convergence rates: t he Weighted Birkhoff Method and the Embedding Continuation Method. They are based on the Takens Embedding Theorem and the Birkhoff Ergodic Theorem. I will illustrate these for one- and two-dimensional examples ideas by compu ting rotation vectors or numbers\, computing Fourier components for conjuga cies\, and distinguishing chaos versus quasiperiodic behavior. LAST-MODIFIED:20181008T141826Z LOCATION:AV Williams (AVW) 1147 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T210000Z DTEND:20181114T223000Z DTSTAMP:20260828T094430Z UID:64qjapb46dhj0bb2cdij0b9k74p6cbb16so64bb6c4r30ohnc9hmce9ocg@google.com CREATED:20181109T181303Z DESCRIPTION:Title : "Searches for New Long-lived Particles and Non-conventi onal signatures in CMS"\nSpeaker Name: Geng-Yuan Jeng\nSpeaker Institution : University of Maryland\nNotes: \nAbstract : Many extensions of the Standa rd Model of Particle Physics that address open issues\, such as dark matter and matter-antimatter asymmetry\, call for new long-lived particles. These new particles can decay at macroscopic distances from the interaction poin t and give rise to non-conventional signatures in the detector\, thus easil y escaping the scrutiny of the existing prompt searches at the LHC. The vas t class of beyond the Standard Model long-lived phenomena presents rich dis covery opportunities for the (HL-)LHC. In this talk I will provide an overv iew of the recent searches for exotica physics at the CMS experiment\, with a particular focus on the broad spectrum of final state signatures of new long-lived particles\, including displaced photons/leptons/jets\, disappear ing tracks\, stopped particles\, and emerging jets. LAST-MODIFIED:20181112T183920Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190226T181500Z DTEND:20190226T191500Z DTSTAMP:20260828T094430Z UID:4t0kadv113gass4lh8bqhvjinu@google.com CREATED:20190205T174935Z LAST-MODIFIED:20190205T174935Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181114T193000Z DTEND:20181114T210000Z DTSTAMP:20260828T094430Z UID:5eje6ourvlo7l1hr4303a5ad32@google.com CREATED:20181106T162718Z DESCRIPTION:
    Title: Causality Constraints in Holography

    Speaker: Netta Engelhardt \, Princeton University &\; MIT

    Abstract: tk LAST-MODIFIED:20181109T134605Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200224T210000Z DTEND:20200224T223000Z DTSTAMP:20260828T094430Z UID:0fud2vg98p1k2ft9hmc4di77v9@google.com CREATED:20200109T160729Z DESCRIPTION:Malte Buschmann\, University of Michigan\n\nTitle: Origin and P henomenology of Axion Minihalos\n\n\nAbstract: We characterize the spectrum of axion minihalos that are generated from primordial perturbations in a s cenario where the Peccei-Quinn (PQ) symmetry is broken after inflation. We comment on implications for efforts to detect axion dark matter (DM) in par ticular through neutron stars. We also measure the DM density at different simulated masses and argue that the correct DM density is obtained for an a xion mass of 25.2 ± 11.0 µeV. LAST-MODIFIED:20200212T163357Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201109T210000Z DTEND:20201109T223000Z DTSTAMP:20260828T094430Z UID:5upbo7k51i94l8ce2rjtqu3cef@google.com CREATED:20200909T181707Z DESCRIPTION:Title: Supercurrent detection of novel multi-terminal Andreev b ound states
    Speaker: Hanho Lee\, UMD


    Abstract: Multi-terminal Josephson supercurrent is interesting in that it depends on two or more su perconducting phase differences. It is attributed to a novel \;type of& nbsp\;Andreev bound states \;whose wavefunction penetrates into multipl e superconductors. \;We study gate-dependent supercurrent transport in four-terminal Josephson junctions fabricated on hybrid Al/InAs epitaxial he terostructures. Critical current contour\, a distinct characteristic of mul ti-terminal Josephson junctions\, is measured as a function of the gate vol tage and magnetic field. Based on realistic numerical simulations of mesosc opic superconductor-semiconductor hybrid systems\, we conclude that multi-t erminal supercurrent \;can be \;distinguished from conventional two -terminal supercurrent. We also find that disorder plays an important role in variations of critical current contour with the applied magnetic fields.  \;Our study is relevant in the context of engineering zero energy boun d states and novel superconducting devices.  \;Advisor: \;Manuchary an \; \;Group

    Zoom Link \; &\; \; \;Log In Information


    https://umd.zoom.us/s/9 1198037643

    Meeting ID: 911 9803 7643 \;

    Password:558484  \;

    LAST-MODIFIED:20201106T165612Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Hanho Lee\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200131T170000Z DTEND:20200131T174000Z DTSTAMP:20260828T094430Z UID:6gqcmrq5pv0n2i69b5d7kie298@google.com CREATED:20200124T172538Z DESCRIPTION:\nTitle: Conformal field theories are magical\nSpeaker: Christ opher White\n\n\n(pizza and drinks served at 12pm\; talk starts at 12:10pm) \n\nAbstract: "Mana" is a measure of the degree to which a state cannot be approximated the result of Clifford gates\; consequently\, it can measure b oth the difficulty of state preparation on a quantum computer\, and the deg ree to which entanglement is non-Bell-pair. I will show numerical calculati ons of the mana of ground states of the one-dimensional Z3 Potts model\, ch osen for convenience\, in which we find that the mana is extensive and peak ed at the phase transition. I will then comment on the implications of this fact both for quantum simulation of field theories and for AdS-CFT-motivat ed Ansätze for CFT ground states. LAST-MODIFIED:20200129T222304Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200205T200000Z DTEND:20200205T210000Z DTSTAMP:20260828T094430Z UID:3lln0dejn6c41ni1g5k1ksuedc@google.com CREATED:20200203T152052Z DESCRIPTION:Prof. Yuping Zeng
    Speaker Institution : University of Delawa re\, Electrical and Computer Engineering Department

    Abstract : Innov ating electronic materials and related process technologies are critical in achieving advanced devices with high performances and new systems with com plex functions.
    III-V compound semiconductors are attractive due to thei r small effective masses and high electron mobility. My research has been f ocused on design and fabrication of electron devices with III-V compound se miconductors and other new materials such as 2D materials and oxides.
    I n this talk\, I will talk about our recently demonstrated GaN high electron mobility transistors with record high performance as well as InAs fin fiel d effect transistors\, MoS2 transistors and TiO2 thin film transistors. Our newly developed superacid treatment technique on InAs fin field effect tra nsistors and MOS2 transistors will be discussed. In addition\, TiO2 thin fi lm transistors with record high performances will also be elaborated.
    O ur newly developed device technology provides meaningful knowledge and hope fully broadly impact the device field and other interdisciplinary field.
    *NEW POLICY: All Visitors to LPS must present a photo ID for entry to t he colloquium*


    Note: LPS is located at 8050 Greenmead Drive in C ollege Park. There is parking at LPS and overflow parking at the adjacent L TS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please use the phone on the left hand sid e of the front door to call the receptionist for entry.
    For more informa tion please contact Dave Bowen [dbowen 1@lps.umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20200203T152052Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161121T110000 DTEND;TZID=America/New_York:20161121T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161121T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Eva Andrei\n\nSpeaker Institution: Rutgers Univer sity\n\nTitle: Imperfect Graphene\n\nAbstract: Graphene in its pristine for m has transformed our understanding of 2D electron systems leading to funda mental discoveries and to the promise of important applications. I will dis cuss new and surprising phenomena that emerge when the perfect honeycomb la ttice of graphene is disrupted. In particular I will focus on the effects o f single atom vacancies on graphene's electronic and magnetic properties as revealed by scanning tunneling microscopy and spectroscopy. These include charging the vacancy site into the supercritical regime where atomic collap se leads to the formation of an artificial atom[1]\, and electrostatically controlled Kondo screening of the vacancy magnetic moment.\n[1] J.Mao\, Y.J iang\, D. Moldovan\, G. Li\, K. Watanabe\, T. Taniguchi\, M. R. Masir\, F.M . Peeters\, E.Y. Andrei\, Tunable Artificial Atom at a Supercritically Char ged Vacancy in Graphene\, Nature Physics 2016\, doi:10.1038/nphys3665 LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191101T150000Z DTEND:20191101T160000Z DTSTAMP:20260828T094430Z UID:38lchug81db6vv43urlbhnuot1@google.com CREATED:20191029T113638Z DESCRIPTION:Title: Moiré laboratory of rescaled solids: graphene and transi tion metal dichalcogenide systems

    Speaker: Noah Fanqi Yuan (MIT)

    Abstract: A moiré superlattice is formed by two similar lattices but wi th small lattice mismatch. Recently\, exciting experimental results are rep orted in moiré superlattices of graphene [1\, 2] and transition metal dicha lcogenide (TMD) [3\, 4]. In this talk\, I would like to discuss our theoret ical understanding of such moiré systems. The take-home message is that\, c ompared with atomic lattices\, moiré superlattices can be regarded as resca led solids with similar “chemistry”\, but tunable band structure and intera ction strength on the energy scale of 10~100 meV. The interplay between suc h “moiré chemistry” and Coulomb interactions lead to various correlated pha ses\, which may help us to understand graphene [5\, 6\, 7] and TMD superlat tices [8\, 9\, 10]. If I have time\, weak coupling approach in momentum spa ce [11\, 12\, 13] will also be discussed.

    [1] Y. Cao\, V. Fatemi\, A . Demir\, S. Fang\, S. L. Tomarken\, J. Y. Luo\, J. D. Sanchez-Yamagishi\, K. Watanabe\, T. Taniguchi\, E. Kaxiras\, et al.\, Nature 556\, 80 (2018).< br>
    [2] Y. Cao\, V. Fatemi\, S. Fang\, K. Watanabe\, T. Taniguchi\, E. K axiras\, and P. Jarillo-Herrero\, Nature 556\, 43 (2018).

    [3] Yanhao Tang\, Lizhong Li\, Tingxin Li\, Yang Xu\, Song Liu\, Katayun Barmak\, Ken ji Watanabe\, Takashi Taniguchi\, Allan H MacDonald\, Jie Shan\, Kin Fai Ma k\, arXiv: 1910.08673 (2019).

    [4] Emma C. Regan\, Danqing Wang\, Che nhao Jin\, M. Iqbal Bakti Utama\, Beini Gao\, Xin Wei\, Sihan Zhao\, Wenyu Zhao\, Kentaro Yumigeta\, Mark Blei\, Johan Carlstroem\, Kenji Watanabe\, T akashi Taniguchi\, Sefaattin Tongay\, Michael Crommie\, Alex Zettl\, Feng W ang\, arXiv: 1910.09047 (2019).

    [5] N. F. Q. Yuan and L. Fu\, Phys. Rev. B 98\, 045103 (2018).

    [6] M. Koshino\, N. F. Q. Yuan\, T. Koret sune\, M. Ochi\, K. Kuroki\, and L. Fu\, Phys. Rev. X 8\, 031087 (2018).

    [7] H. Isobe\, N. F. Q. Yuan\, and L. Fu\, Phys. Rev. X 8\, 041041 (20 18).

    [8] F.Wu\, T. Lovorn\, E. Tutuc\, and A. H. MacDonald\, Phys. R ev. Lett. 121\, 026402 (2018).

    [9] F. Wu\, T. Lovorn\, E. Tutuc\, I. Martin\, and A. MacDonald\, Phys. Rev. Lett. 122\, 086402 (2019).

    [ 10] Yang Zhang*\, Noah F. Q. Yuan*\, and Liang Fu\, to appear on arXiv.

    [11] Noah F. Q. Yuan\, Hiroki Isobe\, Liang Fu\, arXiv:1901.05432 (2019 )\, to appear on Nature Communications.

    [12] Noah F. Q. Yuan\, Liang Fu\, arXiv:1910.10179 (2019).

    [13] Anirudh Chandrasekaran\, Alex Sh tyk\, Joseph J. Betouras\, and Claudio Chamon\, arXiv:1910.10183 (2019).


    Condensed Matter Theory Center website:
    http://www.physics.umd.edu/cmtc/seminars.h tml LAST-MODIFIED:20191029T114044Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181120T160000 DTEND;TZID=America/New_York:20181120T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181120T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Matthew Fisher\, UCSB\n\nTitle: Are we quantum compute rs\, or merely clever robots?\n\nAbstract: Of course quantum information pr ocessing is not possible in the warm wet brain. There is\, however\, one “l oophole” - offered by nuclear spins - that must be closed before acknowledg ing that we are merely clever robots. Putative neural quantum processing wi th nuclear spins seemingly requires fulfillment of many unrealizable condit ions: for example\, a common biological element with a very isolated nuclea r spin to serve as a qubit\, a mechanism for quantum entangling qubits\, a mechanism for quantum memory storage and processing\, a quantum to biochemi cal transduction that modulates neuron firing rates\, among others. My stra tegy\, guided by these requirements\, is one of reverse engineering seeking to identify the bio-chemical substrate and mechanisms hosting such putativ e quantum processing. Remarkably\, a specific neural qubit and a unique col lection of ions\, molecules and enzymes is identified\, illuminating an app arently single path towards nuclear spin quantum processing in the brain. \ n\nHost: Michael Fisher LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181207T190000Z DTEND:20181207T200000Z DTSTAMP:20260828T094430Z UID:4eevah7905mdvml623vh04brmr@google.com CREATED:20181119T141244Z DESCRIPTION:Title: Climate Change and the Wind-driven Ocean Circulation \n\ nSpeaker: Professor Michael Ghil\, Ecole Normale Supérieure\, Paris & Unive rsity of California\, Los Angeles. \n\nAbstract: The large-scale\, near-sur face flow of the mid-latitude oceans is dominated by the presence of a larg er\, anticyclonic and a smaller\, cyclonic gyre. The two gyres share the ea stward extension of western boundary currents\, such as the Gulf Stream or Kuroshio\, and are induced by the shear in the winds that cross the respect ive ocean basins. This phenomenology is described by a hierarchy of models — quasi-geostrophic\, shallow-water and primitive equations — with an incre asing horizontal resolution and number of vertical levels. We study the int erannual variability of this wind-driven\, double-gyre circulation in mid-l atitude ocean basins\, subject to time-constant\, purely periodic\, and mor e realistic forms of time-dependent wind stress\, both deterministic and ra ndom. \n \nAnalytical and numerical methods of dynamical systems theory are applied to the models of interest. We discuss the associated pullback and random attractors and the non-uniqueness of the invariant measures that are obtained. The effects of the oceans’ variability on the atmosphere above a re explored and compared to observations. Finally\, connections are made wi th the highly topical issues of climate change and climate sensitivity. \n \nThis talk reflects collaborative work with a large and still increasing n umber of people. For their names\, affiliations\, and respective contributi ons\, please visit https://dept.atmos.ucla.edu/tcd and https://www.research gate.net/profile/Michael_Ghil.\n\n\nHost: Safa Motesharrei and Eugenia Kaln ay (Please email ssm@umd.edu to arrange an individual meeting with Dr. Ghil .) LAST-MODIFIED:20181119T141244Z LOCATION:ATL 4301 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Atmospheric & Oceanic Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200309T193000Z DTEND:20200309T203000Z DTSTAMP:20260828T094430Z UID:6m26vsekqb0ohcba98f8s7g6gq@google.com CREATED:20200305T170629Z DESCRIPTION:Title : Probing supermassive black hole binaries with pulsar ti ming\n\nSpeaker Name: Chiara Mingarelli\n\nSpeaker Institution : University of Connecticut\n\nAbstract : Galaxy mergers are a standard aspect of galax y formation and evolution\, and most (likely all) large galaxies contain su permassive black holes. As part of the merging process\, the supermassive b lack holes should in-spiral together and eventually merge\, generating a ba ckground of gravitational radiation in the nanohertz to microhertz regime. An array of precisely timed pulsars spread across the sky can form a galac tic-scale gravitational wave detector in the nanohertz band. I describe the current efforts to develop and extend the pulsar timing array concept\, to gether with recent limits which have emerged from international efforts to constrain astrophysical phenomena at the heart of supermassive black hole m ergers.\n\n\nHosted by: John Cullinan LAST-MODIFIED:20200309T152421Z LOCATION:1136 Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED: Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201123T213000Z DTEND:20201123T223000Z DTSTAMP:20260828T094430Z UID:71lcm8p1v1ff0tkhf23ogh879b@google.com CREATED:20201110T022513Z DESCRIPTION:Title: \;The D/H Ratio in Cometary Dust

    Speaker:&nbs p\;John Paquette\, \;NASA Goddard Space Flight Center

    Abstract: The D/H ratio is a clue to the origin and evolution of hydrogen-bearing che mical species in solar system materials. D/H has been observed in the coma of many comets\, but most of those measurements have been in gaseous water. We present the first in-situ measurements of the D/H ratios in the organic refractory component of cometary dust particles collected at very low impa ct speeds in the coma of comet 67P/Churyumov-Gerasimenko (hereafter 67P) by the \;COSIMA \;instrument onboard \;Rosetta. The values measured by COS IMA are spatial averages over the approximately 35 x 50 micron beam spot. T he average D/H ratio for the 25 measured particles is (1.41 ± 0.45) x 10-3\ , about an order of magnitude higher than the Vi enna Standard Mean Ocean Water ­(VSMOW) but more than order of magnitud e lower than the values measured in organics in solar protostar regions and hot cores. This relatively high averaged value suggests that refractory ca rbonaceous matter in comet 67P is less processed than the most primitive me teorite insoluble organic matter (IOM) which has a D/H ratio in the range o f about 1 to 7 x 10-4. The in-situ measured cometary particles have also a higher H/C ratio than the IOM and we deduce that the measured D/H in cometa ry organics is an inheritance from the protosolar molecular cloud from whic h the Solar System formed. The high D/H ratio observed in the cometary part icles challenges models in which high D/H ratios result solely from alterat ion processes in the protosolar disk.



    Visit \;https://bit.ly/2PmJoT6 \;for access. LAST-MODIFIED:20201110T022513Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200727T190000Z DTEND:20200727T200000Z DTSTAMP:20260828T094430Z UID:4be037k95vilqmp5jpf28jg1r0@google.com CREATED:20200609T174231Z DESCRIPTION:Speaker: Roberto Contino\, Scuola Normale Superiore\n\nSeminar will be conducted via zoom.\n\n\nTitle: "Probing Elusive Dark Sectors in th e Lab and in the Sky"\n\nAbstract:\n"The experimental evidence for the exis tence of the Dark Matter (DM) in our Universe comes so far uniquely from gr avitational probes\, suggesting that the DM candidate might reside in a sec tor of the theory whose constituents are neutral under the SM gauge interac tions. \nMotivated by this consideration\, I will discuss elusive dark sect ors that interact with the SM sector only though irrelevant portal interact ions\, and I will analyze how they can be probed through terrestrial experi ments and celestial observations.” LAST-MODIFIED:20200709T155718Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191203T160000Z DTEND:20191203T171500Z DTSTAMP:20260828T094430Z UID:7mo42o62uuavl3sm5mtu4tkua5@google.com CREATED:20190829T195455Z DESCRIPTION:Title: TBA\n\nSpeaker: Nandini Trivedi (Ohio State)\n\nAbstract : TBA\n\nCondensed Matter Theory Center website:\nhttp://www.physics.umd.ed u/cmtc/seminars.html LAST-MODIFIED:20201206T125010Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201007T150000Z DTEND:20201007T160000Z DTSTAMP:20260828T094430Z UID:40rsmkca3ep05q128frvcha4im@google.com CREATED:20200923T161452Z DESCRIPTION:Speaker: Susan Rempe\, \;Senior Scientist\, Sandia National Laboratories\, \;
    Sandia National Lab - \;https://www.sand ia.gov/bioscience-people/researchers/susan-rempe.html

    Title:&nbs p\;Carbon Dioxide Separation from a Gas Mixture with Bio-Inspired Materials

    Abstract: \;Excess carbon dioxide (CO2) in the atmosphere is wa rming the Earth’s surface\, causing changes to the climate. The primary sou rces of excess CO2 are the combustion of fossil fuels and production of cem ent. \; One approach to stopping the global temperature rise is to avoi d further emissions by capturing CO2 and storing it. \; A major challen ge of carbon capture is how to separate CO2 efficiently from a mixture of g ases so that capture minimally affects the economy. Our approach is to take inspiration from biological systems that excel at efficient separation of specific chemical species. Of particular interest to this work are enzymes that speed-up dissolution of CO2 into aqueous solution\, and nanopores in c ellular membranes that promote the rapid transport of specific molecules. W e used molecular modeling to design nanopores that incorporate enzymes and promote rapid CO2 transport. To test those designs\, we used atomic layer d eposition to modify nanopore surface chemistry to have both hydrophilic (wa ter-loving) and hydrophobic (water-fearing) surface chemistries. Here\, we describe the new membrane designs and how they might be implemented in synt hetic membranes to capture CO2 efficiently from industrial gas emissions.

    Sandia National Laboratories is a multimission laboratory man aged and operated by National Technology and Engineering Solutions of Sandi a\, LLC\, a wholly owned subsidiary of Honeywell International\, Inc.\, for the US Department of Energy’s National Nuclear Security Administration und er contract DE-NA-0003525. \;


    ZOOM: \;https://umd.zoom .us/j/92689174899?pwd=Rk50MklZY3VMSFRkUFpWQTVqcXVNUT09 LAST-MODIFIED:20201005T171319Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhysJoint TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191125T190000Z DTEND:20191125T200000Z DTSTAMP:20260828T094430Z UID:3ickvict9982h559ccuo4a6b3h@google.com CREATED:20191113T123452Z DESCRIPTION:Title: The Measurement-Induced Transition in Open Quantum Syste ms\n\nSpeaker: Michael Gullans\, Princeton\n\nAbstract: Quantum technologi es fundamentally rely on quantum control\, measurement\, and feedback\; how ever\, a general understanding of many-body quantum dynamics under these co nditions remains in its early stages. Such studies may provide insight int o the dynamics of quantum computers undergoing active quantum error correct ion while running nontrivial quantum algorithms\, as well as point to a mor e general understanding of the transition from quantum to classical physics in many-body systems. Measurement-induced transitions are a recently unco vered class of critical phenomena that generically occur when many-body uni tary dynamics are interspersed with measurements at a tunable rate. As suc h\, they realize a simple paradigm to begin investigating these questions f rom the viewpoint of statistical physics. We uncover precise connections b etween this phase transition and quantum error correction thresholds in the quantum channel capacity of open system dynamics. We then show how to def ine a local order parameter for the transition that is defined in terms of the ability of the system to store one bit of quantum information. Using t his order parameter\, we identify scalable probes of the transition that ar e immediately applicable to advanced quantum computing platforms such as tr apped ions\, superconducting qubits\, or neutral atoms. Studying this clas s of measurement-driven many-body dynamics may potentially lead to more eff icient realizations of scalable\, fault-tolerant quantum computing. LAST-MODIFIED:20191113T123452Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI/QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200914T150000Z DTEND:20200914T160000Z DTSTAMP:20260828T094430Z UID:36b1j42ft1ls534dk6d982gqd3@google.com CREATED:20200908T215937Z DESCRIPTION:
    Title: Moiré Superlattices and Their Potential for Quantum Information Science

    Speaker: Elaine Li institution: University of Te xas

    Abstract: A new type of superlattice\, known as the \;moiré&n bsp\;superlattice\, forms when two monolayers of van der Waals materials ar e vertically stacked. The period of the moire superlattice is readily contr olled by the lattice constant mismatch and the twist angle. The energy modu lation within a supercell varies as much as a few hundred meV\, effectively trapping carriers and excitons. These superlattices exhibit a host of rich properties that may find applications in quantum information science such as an array of single quantum emitters and quantum simulations. \;

    < br>


    We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email a nnouncing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will fi nd a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews(link is external). LAST-MODIFIED:20200908T215937Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual Series) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181031T183000Z DTEND:20181031T200000Z DTSTAMP:20260828T094430Z UID:5gb78lae67qbbq5tdbmo6g62nr@google.com CREATED:20181011T153636Z DESCRIPTION:

    Title: Tabletop experiments for quantum gravity

    Speaker: Dan Car ney\, QuICS\, University of Maryland

    Abstract: Recent advances in co oling\, control\, and measurement of mechanical systems in the quantum regi me have opened the possibility of the first direct observation of quantum g ravity\, at scales achievable in experiments. I'll give a broad overview of this idea\, discussing a representative set of experiments and how they ca n be used to test various models of the gravitational field coupled to quan tum matter. Particular attention will be paid to perturbatively quantized g eneral relativity viewed as an effective field theory. LAST-MODIFIED:20181011T153636Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200331T160000 DTEND;TZID=America/New_York:20200331T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200331T160000 CREATED:20190530T191015Z DESCRIPTION:
    Speaker: Jim Gates

    Title: Proving Einstein Right: Th e Daring Expeditions that Changed How We Look at the Universe


    Co llege Park Professor Jim Gates will discuss his new book\, which was co-authored by Cathie Pelletier. Provi ng Einstein Right: The Daring Expeditions that Changed How We Look at the U niverse tells the story of determined astronomers in the early twen tieth century testing Einstein's theory of general relativity by observing starlight during a solar eclipse. \; A book signing will follow the tal k. If you'd like to order a copy\, pleas e do so using this form by March 13.

    Parking is availabl e in the Regents Drive Parking Garage ( PG2). An attendant will direct visitors within the garage. Additionally\, a free ShuttleUM bus runs between the College Park Metro Station and Regents Drive at a bout eight-minute intervals.

    For further information\, please conta ct the Physics Department at 301-405-5946 or email physchair-rsvp@umd.edu.

    LAST-MODIFIED:20200311T160843Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED: Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170417T110000 DTEND;TZID=America/New_York:20170417T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170417T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Anna Sanpera\, Universitat Autònoma de Barcelona\n\nTi tle: Simulating & Understanding Quantum Spin Liquids\n\nAbstract: Disordere d quantum antiferromagnets in two-dimensional compounds have been a focus o f interest in the last years due to their exotic properties. However\, with very few exceptions\, the ground states of the corresponding Hamiltonians are notoriously difficult to simulate making their characterization and det ection very elusive\, both\, theoretically and experimentally. Here we prop ose a method to signal quantum disordered antiferromagnets by doing exact d iagonalization in small lattices using random boundary conditions and avera ging the observables of interest over the different disorder realizations. We use our method to analyze the competition between frustration and quantu m fluctuations arising in some models that might lead to some spin liquid p hases as predicted from different methods ranging from spin wave mean field theory to 2D-DMRG or PEPS. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190826T190000Z DTEND:20190826T203000Z DTSTAMP:20260828T094430Z UID:78r6d2uu02qhu5iil80kp9ccch@google.com CREATED:20190813T161918Z DESCRIPTION:Kim Berghaus\, Johns Hopkins University\n\nTitle: Firing up cos mology with the dissipative axion\n\nAbstract: Rolling scalar fields play a n important role in understanding cosmology within a particle physics frame work. Coupling a rolling scalar field to light degrees of freedom can sourc e a thermal bath\, thus converting potential energy efficiently to radiatio n. In my talk\, I will illuminate why the axion of a non-abelian gauge grou p is the ideal candidate for this process and how it sets the stage for a m inimal setup of warm inflation\, as well as a potential solution to the Hub ble tension. LAST-MODIFIED:20190819T182816Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191114T150000Z DTEND:20191114T153000Z DTSTAMP:20260828T094430Z UID:27l7v9gqimatqp3smg7n0n3epk@google.com CREATED:20191107T203939Z DESCRIPTION:

    Dr. Steven Prawer\, Prof. of Physics\, \; Universit y of Melbourne

    Degenerative diseases of the retina such as age-r elated macular degeneration and retinitis pigmentosa destroy the photorecep tors in the retina but leave intact the neural network of ganglion cells th at form the optic nerve. Via direct electrical stimulation of these ganglio n cells it is possible to elicit visual percepts in the brain\, known as ph osphenes. Retinal implants which use electrical stimulation to restore a se nse of vision are now a reality for a growing number of users worldwide. Ne vertheless\, visual acuities provided by the current generation of \;de vices are low. The quantity of information transferable to the retina using existing implant technologies is limited\, far below receptor cells’ capab ilities. Many agree that increasing the information density deliverable by a retinal prosthesis requires devices with stimulation electrodes that are both dense and numerous. This work describes a new generation of retinal pr ostheses capable of upscaling the information density conveyable to the ret ina. Centered on engineered diamond materials\, the implant is very well to lerated and long-term stable in the eye’s unique physiological environment and capable of delivering highly versatile stimulation waveforms – both key attributes in providing useful vision. Delivery of high-density informatio n\, close to the retina with the flexibility to alter stimulation parameter s in situ provides the best chance for success in providing high acuity pro sthetic vision.

    Bio: \;Steven Prawer has a world wide reputation in advanced diamond science and technology with over 30 yea rs of experience and over 390 scientific publications. His particular focus has been the merging of the areas of nanoscience and neuroscience to push the boundaries of bionic devices\, and he has been the recipient of numerou s awards including the Lady Davis Visiting Professorship\, the David Syme R esearch Prize\, a Fulbright Senior visiting fellowship\, a visiting fellows hip at Woolfson College in Oxford\, and the Royal Society of Victoria Resea rch medal. In 2010\, Professor Prawer was elected to the Australian Academy of Science in recognition of his seminal contributions to diamond science and technology


    http://bbi.umd.edu/events/index.php?mode=4&\;id=14774< span> LAST-MODIFIED:20191107T203939Z LOCATION:1107 Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Diamond Eye: Architecture and Reduction to Practice TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181012T170000Z DTEND:20181012T180000Z DTSTAMP:20260828T094430Z UID:2u201q3er9ao935nufkiitd689@google.com CREATED:20180905T152306Z DESCRIPTION:Speaker: John Kasianowicz\, Physical Scientist\, NIST

    Title: Identifying Individual Molecules with Single Nanometer-Scale Pores

    Abstract: Proteinaceous nanometer-scale pores p rovide the molecular basis of action for nerve\, muscle and many other tiss ues. We have been developing them for the detection\, characterization\, i dentification\, and quantitation of single molecules. I will discuss the p otential use of this method for practical applications\, including DNA sequ encing\, single molecule “mass spectrometry”\, single molecule force spectr oscopy\, therapeutics development\, and the identification of synthetic nan oparticles\, proteins\, and other biomarkers. LAST-MODIFIED:20181003T130015Z LOCATION:2108 Chem/Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201104T160000Z DTEND:20201104T170000Z DTSTAMP:20260828T094430Z UID:34daluj552q1r6e92mci6gf3pj@google.com CREATED:20200923T162240Z DESCRIPTION:Speaker: YuHung Wang Group

    Title: Literature Seminar for Ziyi Wang

    Abstract: TBA

    ZOOM: \;https://umd.zoom.us/j/98469047753?pwd=bk9jbVpOVHVLSUd1clNNZHdrZ FlYQT09 LAST-MODIFIED:20200923T162240Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181026T170000Z DTEND:20181026T180000Z DTSTAMP:20260828T094430Z UID:3sr2p0au2jlk6lm19ntismfrpk@google.com CREATED:20180905T152936Z DESCRIPTION:Speaker: Christian Schoneich\, Professor and Chair\, Dept. o f Pharmaceutical Chemistry\, University of Kansas

    Title: A Ch emical Perspective on the Design of Stable Protein Pharmaceuticals: Polymer s\, Particles\, and Immunogenicity

    Abstract: The p hysical and chemical stability of proteins has a significant impact on the design of stable formulations\, which can be administered to patients witho ut adverse side effects such as\, e.g.\, immunogenic reactions. In practice \, the design of successful drug products is the result of close collaborat ions between scientists from multiple fields including biotechnology\, prot ein and analytical chemistry\, biophysics\, pharmaceutical sciences and eng ineering. From a chemical point of view\, some protein degradation pathways can be predicted\, and depend on the chemical environment of the respectiv e formulations. Other degradation processes frequently “come as a surprise” \, and involve complex reactions of excipients\, including polymers\, or “l eft-over” material from manufacturing processes of chemicals and devices. T his lecture will provide representative examples on the complexity of chemi cal degradation processes\, and their potential consequences for formulatio n and device design. \; LAST-MODIFIED:20181018T123209Z LOCATION:2108 Chem/Nuclear Engr Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190429T203000Z DTEND:20190429T213000Z DTSTAMP:20260828T094430Z UID:3cmobliminh9h68274vb1k90cb@google.com CREATED:20190420T041542Z DESCRIPTION:Title: New Results from the HAWC Gamma Ray Observatory

    Speaker: Jordan Goodman\, Department of Physics\, University of Maryland
    Abstract: The High Altitude Water Cherenkov (HAWC) Gamma-ray Observat ory is the most sensitive wide field-of-view\, continuously operating\, TeV gamma-ray telescope. HAWC\, located in the high mountains of Mexico\, was completed in March of 2015. It has collected more than four years of data g iving us a new view of the TeV sky. This talk will present an overview of r ecent HAWC results including our updated source catalog\, our view of the h ighest energy gamma-ray sky including several new PeVatron candidates\, obs ervations of nearby middle-aged pulsars\, first observations of TeV emissio n from the jets of a micro-quasar\, new limits on dark matter\, new results on star forming regions and monitoring of TeV transients including our sea rch for neutrino and gravitational wave counterparts. We will also review p lans for operating HAWC with our newly completed outrigger array.

    No tes: Coffee\, Tea &\; Snacks 4:15-4:30 PM LAST-MODIFIED:20190420T041542Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170130T110000 DTEND;TZID=America/New_York:20170130T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170130T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: David Reitze\n\nSpeaker Institution: LIGO/CalTec h\n\nTitle: Detecting Gravitational Waves From Binary Black Hole Mergers fo r the First Time Ever With LIGO\n\nAbstract: The first direct detections of gravitational waves in late 2015 were made possible by a forty year experi mental campaign to design\, build\, and operate LIGO\, the Laser Interferom eter Gravitational-wave Observatory. In this talk\, I’ll cover gravitation al waves and what makes them so difficult to detect and at the same time su ch powerful and unique probes of the universe. Most of the presentation wi ll focus on the interferometers\, the LIGO detections and their astrophysic al implications. Finally\, I’ll give a preview of where LIGO intends to g o in the next decade and beyond\, emphasizing the interface between quantum science and gravitational-wave detectors. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201110T150000Z DTEND:20201110T160000Z DTSTAMP:20260828T094430Z UID:7c5ltiiqd7ss16frtg3m9ndqn9@google.com CREATED:20201029T204123Z DESCRIPTION:
    Email rcawthor@umd.edu for Zoom details

    Speak er: Ryohei Kobayashi (ISSP University of Tokyo)

    Title: Interacting f ermionic topological phases with time reversal symmetry

    Abstract: In this talk\, we discuss a recipe to produce a lattice construction of fermi onic topological phases of matter on unoriented spacetime\, which plays a c rucial role to study topological phases or anomalies based on the time reve rsal symmetry. \;
    As an application\, we construct a gapped boundary for a large class of fermionic SPT phases protected by finite onsite symme try\, based on our path integral description in the presence of boundaries. We will also formulate a local path integral for the (1+1)d topological su perconductor in class BDI classified by Z8\, and discuss its application to the problem of finding non-local order parameter for the Z8 classification . If time permits\, we also refer to an exactly solvable Hamiltonian model for (3+1)d topological superconductor in class DIII\, which covers the Z8 s ubgroup of the Z16 classification. The talk will be based on arXiv:1905.059 02\, 1905.05391\, 1911.00653\, 2006.00159. LAST-MODIFIED:20201103T233320Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar - Informal TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190522T200000Z DTEND:20190522T210000Z DTSTAMP:20260828T094430Z UID:5ni4gi91t5mub64ehrhbu4sh4s@google.com CREATED:20190515T142430Z DESCRIPTION:Title : DCON for Stellarators \n\nSpeaker Name: Alan Glasser\, Fusion Theory and Computation\, Inc. \n \nAbstract : DCON is a code for det ermining the ideal MHD stabiliity of axisymmetric tokamaks\, based on the D irect Criterion of Newcomb [Phys. Plasma 23\, 072505 (2016)]. It is very fa st and accurate and used at tokamak labs around the world. Fixed-boundary s tability is determined by a generealization of the Newcomb crossing criteri on. Free-boundary stability is computed by coupling to a vacuum code to det ermine whether there are modes with negative total energy. The DCON formali sm has recently been extended to nonaxisymmetric equilibria with stellarato r symmetry\, using equilibria computed by both the VMEC code\, imposing nes ted flux surfaces\, and the SPEC code\, allowing for regions of stochastic magnetic fields. LAST-MODIFIED:20190515T142441Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190418T180000Z DTEND:20190418T193000Z DTSTAMP:20260828T094430Z UID:7h2c5am48pkc3baq7c4o5qdgn6@google.com CREATED:20190130T185857Z DESCRIPTION:Speaker: Andrew Wray\, NYU\nTitle: Interpreting Hundness with X-ray spectroscopy: a missing piece of the many-body picture\nAbstract: \nH und's rules are central to our understanding of how electrons interact to a lign angular momentum on the same atom. However\, their role in many-body s ystems (sometimes called "Hundness") can be phenomenally difficult to evalu ate. I will talk about our recent investigation of several materials poised at the crossover between electronic localization and itinerancy\, and show that Hundness can be a key factor for establishing interesting low-tempera ture phases in such an environment. The talk will focus in particular on th e 'hidden order' state of URu2Si2\, the metal-insulator transition of VO2\, and a 'singlet-based' magnetic phase we have recently discovered in USb2. Our experimental characterization of Hundness involves resolving and manipu lating electronic symmetries on the atomic scale\, and is greatly facilitat ed by ongoing advances in X-ray spectroscopies such as resonant inelastic X -ray scattering (RIXS).\nHost: J. Williams LAST-MODIFIED:20190322T150314Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Andrew Wray\, NYU TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201125T160000Z DTEND:20201125T170000Z DTSTAMP:20260828T094430Z UID:1m01p2fgucld9eae8jdkam12hp@google.com CREATED:20200930T162325Z LAST-MODIFIED:20200930T162421Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhysJoint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201109T110000 DTEND;TZID=America/New_York:20201109T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201109T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; ETH\, EE\, OTOC\, &\; QFI

    Speaker: Mark Srednicki\, University of California Santa Barbara

    Abstract: \;  \;
    In his second week of residence at the University of Maryland\, College Park\, Prof. Srednicki will expand his portrait of thermalization o f many-body quantum systems by introducing and explaining the eigenstate th ermalization hypothesis\, entanglement entropy\, out-of-time-order correlat ions and quantum Fisher information.

    We are hosting the Fall 2020 JQ I Seminars virtually as Zoom meetings. JQI members and affiliates will rece ive a Zoom link in an email announcing each seminar. For those without acce ss to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube pa ge at \;https://www.yout ube.com/user/JQInews \;(link \;is external) LAST-MODIFIED:20201105T193219Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181016T160000 DTEND;TZID=America/New_York:20181016T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181016T160000 CREATED:20180727T143919Z DESCRIPTION:\nVibrations\, Quanta & Biology\n\n\nSpeaker: Martin Plenio\, Ulm University\nConventional wisdom has it that the realisation of quantum technologies requires delicate control employing finest technology and a re markable degree of isolation of the envisaged quantum device from its envir onment. Typically\, this includes ultrahigh vacuum\, ultralow temperatures\ , stable lasers\, shielding against stray fields and so forth. In view of t his\, the warm\, wet and noisy environment that characterises physiology do es not seem to be the ideal environment in which to observe quantum dynamic s and consider its impact on biological function. In this lecture\, however \, I would like to reason why I believe that this may not be such an advent urous notion after all. Moreover\, I will argue that it is indeed the fruit ful interplay between quantum dynamics and the unavoidable noise from the p hysiological environment that leads to optimal functionality in certain bio logically relevant tasks. I will provide simplified theoretical examples an d numerical analysis to bring out some basic ideas such as that of noise su pported dynamics and present some supporting results from experiment. LAST-MODIFIED:20190530T190803Z LOCATION:John S. Toll Physics Building\, Room 1410 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Jeff Mechanick Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191022T171500Z DTEND:20191022T181500Z DTSTAMP:20260828T094430Z UID:6k864s60rlv2clk4vfphiprhl5@google.com CREATED:20190910T140008Z DESCRIPTION:Speaker: Professor Rajarshi Roy\, UMD\, Institute for Physical Science and Technology\n\nTitle: Coherence\, Chimeras and Passage Time Stat istics \n\nAbstract: Noise sources manifest themselves in the dynamics of l asers and their coherence properties. Passage and dwell time measurements on such optical oscillators provide a way to assess the strength and nature of these noise sources and their influence on the coherence of the light e mitted. We will then present examples of measurements showing the transit ion from noise to coherence in time-delayed optoelectronic feedback oscilla tors that can also display chimeras (simultaneous coexistence of synchoniza tion and desynchronization in oscillator networks) and switching statistic s. LAST-MODIFIED:20191016T130654Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181023T171500Z DTEND:20181023T181500Z DTSTAMP:20260828T094430Z UID:7n08h83at3oslou0vs57ipep7v@google.com CREATED:20180905T132516Z DESCRIPTION:Speaker: Tom Kurtzman\, Lehman College \;

    Title: \; What Can We Learn From Local Structural and Thermodynamic Pro perties of Water on Protein Surfaces to Inform Rational Drug Design?

    Abstract:     \;Despite the recent development of methodologies that aim to better characterize local water structure and thermodynamics o n binding site surfaces\, the simply- stated question of whether it would b e beneficial or detrimental\, in a free-energetic sense\, to displace water from a region of a protein with a suitably complementary ligand continues to be a conundrum. Solvation thermodynamic mapping techniques such as GIST and WaterMap have provided valuable insight into the role of displacing wat er in molecular recognition however solvation thermodynamics alone is not p redictive of displaceability and tightly binding ligands regularly displace water from both regions that are characterized as having favorable solvati on and regions that are characterized as having unfavorable solvation. Part of the difficulty of assessing the thermodynamics of water displacement is due to the large number of frequently counteracting contributions and the consequent lack of a simplifying conceptual framework. We will discuss the key insights which have been gained from solvation thermodynamic mapping an d how we are incorporating them into drug discovery and design methodologie s. We will also discuss remaining issues on predicting favorability of wate r displacement and suggest how they might be tackled. \; LAST-MODIFIED:20181011T145135Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201008T140000 DTEND;TZID=America/New_York:20201008T153000 DTSTAMP:20260828T094430Z UID:3c1p2fa08e8h2btjhis0aa1q4e@google.com RECURRENCE-ID;TZID=America/New_York:20201008T140000 CREATED:20200908T181833Z DESCRIPTION:Speaker: \; Kamran Behnia\, National Center for Scie ntific Research (CNRS)

    Title: \;Hydrodynamics of degenera te electrons and their T-square thermal resistivity \; \;

    Abstract:
     \;Detecting hydrodynamic fingerprints in the flow of electrons in solids has become a dynamic field of investigation. Most atte ntion is focused on the regime near the degeneracy temperature when the the rmal velocity can present a spatially modulated profile. We present a study of thermal conductivity in bulk crystals of semi-metallic antimony reveali ng a hydrodynamic feature in the flow of degenerate and quasi-ballistic ele ctrons. We detect a size-dependent departure from the Wiedemann-Franz law d riven by a mismatch between the prefactors of T-square thermal and electric al resistivities.

    This observation is unexpected in the momentum-relaxing picture of transport\, but finds a natural explanation in the hydrodynamic picture where collisions among electrons conserve momentum. In normal-stat e liquid 3He\, both viscosity and thermal diffusivity decrease upon warming and momentum-conserving collisions among fermions produces a T-square ther mal resistivity. Our results imply that the presence of this effect in ultr aclean metals. \;

    Since the Wiedemann-Franz law is recovered when collisions by defects outweigh momentum-conserving collisions\, \; T-s quare electrical resistivity can arise in absence of Umklapp events in a ‘d irty’ metal. This would provide a solution to the puzzling persistence of T -square resistivity in dilute metals such as doped strontium titanate.  \; \;

    Host: Paglione

    For the zoom link please email Kr istin Stenson at \;QMC@umd.edu \;& nbsp\; LAST-MODIFIED:20200917T150303Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Kamran Behnia\, National Center for Scientific Rese arch (CNRS) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190408T200000Z DTEND:20190408T210000Z DTSTAMP:20260828T094430Z UID:7nct969a7dkruehladlug21lgs@google.com CREATED:20190403T203006Z DESCRIPTION:\nTitle: Using high magnetic fields to reveal critical behavior near optimum doping in high-temperature superconductivity\n\nSpeaker: Greg ory S. Boebinger\, National High Magnetic Field Laboratory and Florida Stat e University and the University of Florida\n\nAbstract: We measure the elec tronic specific heat in a series of Ba122 high-temperature superconductors. High magnetic fields are used to suppress the superconducting state\, pro viding a direct experimental determination of the density of electronic sta tes that take part in superconductivity in these samples. We find that thi s density of states is greatly enhanced as one approaches optimum doping\, evidencing increased electronic correlations in more strongly superconducti ng samples. Indeed\, the data extrapolate to imply a divergence precisely at optimum doping. \n\nThe lecture will be preceded with refreshments in ro om 1117 beginning at 3:30p.m. Both events are free of charge and open to th e public. LAST-MODIFIED:20190404T144133Z LOCATION:Room 1201 John S. Toll Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181116T180000Z DTEND:20181116T190000Z DTSTAMP:20260828T094430Z UID:6e899qftbqgb2a09lu68tn4ngm@google.com CREATED:20180905T153316Z DESCRIPTION:Speaker: Joseph Robertson\, Physical Scientist\, NIST

    Title: Critical Interfaces for the Development of Electroche mical Biosensors

    Abstract: Interfaces are at the heart of every biosensor. Whether the sensor depends on specific biorecognition el ements\, low-specificity chemical interactions\, or the fabrication of stru ctured surfaces\, the interface is central to a successful measurement. Th e integration of complex biological molecules such as proteins with metal a nd semiconductor interfaces is limited by several inherent incompatibilitie s. To develop sensors based upon protein-protein interactions at such surfa ces\, three significant obstacles must be overcome: 1) the sensing protein must retain its native\, or native-like structure\, 2) the protein must be in electrical (or optical) contact with the metal surface and 3) the report er protein much be at a sufficiently high concentration to produce a measur able\, unambiguous signal. In this presentation\, I will discuss the fabri cation of polymer-tethered bilayer membranes\, which provides a biomimetic interface capable of addressing each of the three obstacles. With inspirat ion taken from single molecule nanopore sensors\, I will discuss the fabric ation and characterization of an anthrax biosensor and discuss strategies f or the optimization and application these sensors. \; \; LAST-MODIFIED:20181106T182047Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201118T203000Z DTEND:20201118T213000Z DTSTAMP:20260828T094430Z UID:16oq082na583dm601tguthefik@google.com CREATED:20201109T144158Z DESCRIPTION:



    For Zoom address\, contact \;swisdak@umd.edu \;

    Title : From th e Weibel instability to flux-tube coalescence – a pathway to seeding plasma dynamos

    Speaker Name: Muni Zhou

    Speaker Institutio n: MIT PSFC

    Abstract: The amplification of seed magnetic fields by the turbulent dynamo is believed to be essential in forming large -scale cosmic magnetic fields with dynamical strengths. The Weibel instabil ity is a crucial mechanism that can produce near-equipartition seed fields from unmagnetized plasmas\, but only at the plasma kinetic scale. It remain s unclear whether such microscopic seed fields\, under the joint action of their own nonlinear evolution and the background turbulence\, can contribut e to the formation of macroscopic magnetic fields. In the first part of thi s talk\, I will demonstrate how thermal pressure anisotropy can be generate d by motions as simple as a shear flow and trigger the Weibel instability. The ensuing generation and nonlinear evolution of seed magnetic fields are studied within a fully kinetic framework. For the second part\, I will focu s on our study of a system composed of an ensemble of magnetic flux tubes\, the dynamics of which can represent the long-term evolution of filamentary Weibel seed fields. The formation of large-scale magnetic fields from init ial small-scale fields and the associated inverse energy transfer have been identified as a result of the coalescence of magnetic structures through m agnetic reconnection. An analytical model for the time evolution
    of quan tities such as the magnetic energy and the energy-containing scale is const ructed within the magnetohydrodynamic description\, and is confirmed by our direct numerical simulations. In the end\, we apply our study to estimate the scale and strength of the initial seed field for the galactic dynamo pr oblem by considering the interaction between inverse magnetic transfer and ambient turbulence.

    Host: Marc Swisdak
    Host email: \;swisdak@umd.edu LAST-MODIFIED:20201109T144158Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190305T181500Z DTEND:20190305T191500Z DTSTAMP:20260828T094430Z UID:2eq916098bcqsd9pt11032ju7g@google.com CREATED:20190205T160735Z LAST-MODIFIED:20190205T174859Z LOCATION:IPST 1116 Conference (Bldg. #085) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191113T210000Z DTEND:20191113T223000Z DTSTAMP:20260828T094430Z UID:7pr2l0ekjkfgcd1gv475tcpd3h@google.com CREATED:20191108T170405Z DESCRIPTION:






    Title : "CNN Jet Image Tagging: from Top Measurements to New Physics Searches"Speaker Name: Kevin Nash
    Speaker Institution : Rutgers University
    < br>Abstract : We detail the application of image recognition to jet tagging in CMS. The method is based on the CNN top tagging optimization seen in ar Xiv:1803.00107v1 and evolved to include additional color information\, b ta gging\, and an adaptive zoom. Additionally\, we demonstrate how this jet t agging network can be decorrelated from the mass of the progenitor jet\, wh ich allows for the possibility of tagging BSM objects. We study the impact on top tagging sensitivity\, the data-simulation agreement\, and the versat ility of the network to accept more exotic signatures. Finally\, we descri be the application to the latest BSM physics searches. LAST-MODIFIED:20191108T170405Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181126T190000Z DTEND:20181126T200000Z DTSTAMP:20260828T094430Z UID:6otj4vqalek8qqdggs6rpv22qv@google.com CREATED:20181120T193036Z DESCRIPTION:Keshav Thirumalai\nUniversity of Oxford\, UK\n\nTechniques for scaling trapped ion quantum information processors \n\nTrapped ions represe nt one of the most promising systems for realising quantum computing\, but scaling up from a few to many qubits whilst keeping good control remains a significant challenge. Following a modular approach\, where relatively simp le traps containing a few ions are connected together photonically\, I repo rt progress on both local and remote entangling operations to be used in a two node quantum network.\nAs such a network can be better utilised using t wo ion species in each node\, I will discuss work towards generating local high fidelity mixed species entanglement. In our scheme we use a single pai r of Raman beams from one laser to perform a gate between Ca and Sr ions\, by exploiting the relative proximity of their transitions. The gate mechani sm is independent of the qubit frequency\, and requires a simpler experimen tal arrangement than is normally used for mixed species gates.\nI will also show preliminary results demonstrating remote ion entanglement\, by interf ering and measuring photons emitted by an ion in each trap. Finally\, I wil l report results on local fast entanglement generation\, at and beyond the motional period of ions in the trap. LAST-MODIFIED:20181120T193036Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190405T170000Z DTEND:20190405T180000Z DTSTAMP:20260828T094430Z UID:1615pkdi7lqocrud1p9nju9m4s@google.com CREATED:20190124T142450Z DESCRIPTION:Speaker: Deepa Madan\, Assistant Professor of Mechanical Engine ering\, UMBC\n\nTitle: Flexible Thermoelectric and Electrolyte Films\n\nAbs tract: Thermoelectric Generators (TEGs) utilize the temperature difference available between hot surfaces and ambient atmosphere to generate power out put from waste heat. In this talk\, Madan will present a method to synthesi ze thermoelectric (TE) composite slurries to print high-performance TEG dev ices on flexible substrates. Her lab at UMBC focuses on synthesizing\, opti mizing\, and characterizing the thermoelectric properties of polymer-thermo electric composite films. I will share results from our current work on the rmoelectric properties of composite thermoelectric films. Our lab also focu ses on fabricating rechargeable\, flexible\, safe\, and non-toxic batteries . I will share some interesting findings related to the ionic conductivity of flexible and stable wood-based gel electrolyte films. LAST-MODIFIED:20190402T141312Z LOCATION:2110 Chemical & Biomolecular Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191014T190000Z DTEND:20191014T203000Z DTSTAMP:20260828T094430Z UID:36fholbvg6dnds3am20co9q8j8@google.com CREATED:20190723T150201Z DESCRIPTION:Andrea Caputo\, University of Valencia\n\nTitle: Looking for Ax ion Dark Matter: from Dwarf Galaxies to Pulsars\n\n Abstract: Axion and Axi on-like particles are fascinating dark matter candidates and a great effort has been devoted to their study\, both theoretically and experimentally. \nIn this talk I will discuss two different astrophysical searches. The fir st one consists in looking with radio telescopes for the spontaneous decay of axion dark matter using different targets as Dwarf Galaxies\, Clusters o r the Galactic Center. The second one uses the parity violating axion inter actions to exploit the extreme precision of pulsar timing measurements and look for oscillations in the polarization angle of the pulsar signal. LAST-MODIFIED:20191008T175811Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190925T150000Z DTEND:20190925T160000Z DTSTAMP:20260828T094430Z UID:6ie5dbd81ramubus43dblk91un@google.com CREATED:20190903T165311Z DESCRIPTION:Speaker: Qinglin Lin\, Graduate Student\, UMD\, Department of C hemistry and Biochemistry\n\nTitle: Torsional Carbon Nanotube Artificial Mu scles\n\nAbstract: Combining carbon nanotubes and different types of guest materials\, a series of torsional artificial muscle systems are developed w ith different host-guest structures. Torsional actuation can be precisely c ontrolled\, and the mechanical performance is about 1000 times better than other conventional materials. LAST-MODIFIED:20190919T130840Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170501T110000 DTEND;TZID=America/New_York:20170501T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170501T110000 CLASS:PUBLIC CREATED:20160620T170015Z LAST-MODIFIED:20200108T224606Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Cancelled TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20200715T190000Z DTEND:20200715T210000Z DTSTAMP:20260828T094430Z UID:2t9sm3874hmjc79n2634ameoik@google.com CREATED:20200524T183545Z DESCRIPTION:Meeting set up by Dalia Ornelas. More information to come. LAST-MODIFIED:20200524T183601Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Thesis Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201120T180000Z DTEND:20201120T190000Z DTSTAMP:20260828T094430Z UID:7l26v4mjuenvqpse4mt8h7srp2@google.com CREATED:20200923T165754Z DESCRIPTION:Speaker: Kristi L. Kiick\, MSE Professor\, University of Delawa re\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200930T161201Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190422T200000Z DTEND:20190422T210000Z DTSTAMP:20260828T094430Z UID:130ieumqc652ke7v4oo8bsbb1g@google.com CREATED:20190118T170603Z DESCRIPTION:Title: Non-equilibrium coupling of protein structure and functi on to translation elongation kinetics\n\nSpeaker: Edward O'Brien\, Pennsylv ania State University\n\nNotes: http://marylandbiophysics.umd.edu/seminars/ \n\nAbstract: \n\nProtein folding research has been dominated by the assump tion that thermodynamics determines protein structure and function. And tha t when the folding process is compromised in vivo the proteostasis machiner y — chaperones\, deaggregases\, the proteasome — work to restore proteins t o their soluble\, functional form or degrade them to maintain the cellular pool of proteins in a quasi-equilibrium state. During the past decade\, how ever\, more and more proteins have been identified for which altering only their speed of synthesis alters their structure and function\, the efficien cy of the down-stream processes they take part in\, and cellular phenotype. Indeed\, evidence has emerged that evolutionary selection pressures have e ncoded translation-rate information into mRNA molecules to coordinate diver se co-translational processes. Thus\, non-equilibrium physics can play a fu ndamental role in influencing nascent protein behavior\, mRNA sequence evol ution\, and disease. In this talk I will discuss my lab's efforts to unders tand and model this phenomenon through the development application of theor etical tools from the physical sciences including coarse-grained simulation s\, chemical kinetics and statistical mechanics. LAST-MODIFIED:20190118T171050Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190219T181500Z DTEND:20190219T191500Z DTSTAMP:20260828T094430Z UID:5o37e5ovo2pnmvque16m83tkh7@google.com CREATED:20190205T152438Z DESCRIPTION:Speaker: Professor William Noid\, Penn State\n\nTitle: Progress in Coarse-Graining Thermodynamics and Inhomogeneous Systems with Effective Potentials\n\nAbstract: Due to their computational efficiency\, coarse-gra ined (CG) models are widely adopted for simulating soft materials and\, per haps especially\, their interfaces. While rigorous "bottom-up" approaches f or parameterizing CG models accurately describe the structure of bulk phase s\, they are less well developed for modeling thermodynamic properties or i nhomogeneous systems. In this talk\, we present recent progress in modeling thermodynamic properties with CG models employing effective potentials. Ad ditionally\, we present some recent published and unpublished results for s ystematic coarse-graining of inhomogeneous systems. Finally\, we may discus s issues of thermodynamic consistency that arise with bottom-up CG models. LAST-MODIFIED:20190211T135621Z LOCATION:IPST 1116 Conference Room (bldg. #085) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181030T150000Z DTEND:20181030T161500Z DTSTAMP:20260828T094430Z UID:5s77o9ga80u8e3l0bcrrh9tjct@google.com CREATED:20180828T212711Z DESCRIPTION:Speaker: Thomas Vojta (Missouri University of Science and Te chnology)

    Title: Quantum phase transitions and disorder: Griffiths s ingularities\, infinite randomness\, and smearing

    Abstract: Phas e transitions are fascinating phenomena in nature with consequences ranging from the large scale structure of the universe to exotic quantum phases at low temperatures. Many realistic systems contain impurities\, defects and other forms of quenched disorder. This talk explores the consequences of su ch randomness on the properties of phase transitions. At zero-temperature q uantum phase transitions\, randomness can have particularly peculiar and st rong effects. Often\, rare strong disorder fluctuations and the rare spatia l regions that support them dominate the physics close to the transition. T hey give rise to strong singularities in the free energy\, the so-called qu antum-Griffiths singularities. In some systems such as metallic magnets\, t he effects of are fluctuations can be even stronger\, leading to a destruct ion of the
    phase transition by smearing. These general results are illus trated using experiments in transition metal alloys and heavy fermion syste ms.

    Host: Yi-Ting Hsu and Xiao Li

    Condensed Matter Theory Cen ter website:
    http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20181024T113701Z LOCATION:2205 John S. Toll Physics Building (CMTC Conference Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200402T153000 DTEND;TZID=America/New_York:20200402T163000 DTSTAMP:20260828T094430Z UID:5eo89lqa196p5fr8ka3vjbavre_R20200402T193000@google.com RECURRENCE-ID;TZID=America/New_York:20200402T153000 CREATED:20200213T172330Z DESCRIPTION:
    Recurring ZoomMeeting:
    https://umd.zoom.us/j/614678017
    Me eting ID: 614 678 017



    For upcoming talks in this series: \; http://www-math.umd.edu/gcal_rss.p hp?seminar_key=RGP&\;year=2020&\;html


    https://www-math.umd.edu/research/seminar s/current-rits-and-student-seminars.html
    LAST-MODIFIED:20200331T153429Z LOCATION:Via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190213T210000Z DTEND:20190213T223000Z DTSTAMP:20260828T094430Z UID:6mht3fe7u60r0l2mrcjgcncoat@google.com CREATED:20190211T191937Z DESCRIPTION:Title : "Recent Results and Future Plans for the IceCube Neutri no Observatory"\n\n\nSpeaker: Erik Blaufuss\, University of Maryland LAST-MODIFIED:20190211T191937Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200219T160000Z DTEND:20200219T170000Z DTSTAMP:20260828T094430Z UID:4u5qasen5bhlvbli4npr2tkg0v@google.com CREATED:20200122T142739Z DESCRIPTION:Speaker: Laura Kaufman\, Columbia\n\nTitle: TBA\n\nAbstract: TB A LAST-MODIFIED:20200122T142739Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181010T180000Z DTEND:20181010T190000Z DTSTAMP:20260828T094430Z UID:7saf3034b22ph3kcm6b7o3apim@google.com CREATED:20181004T135601Z DESCRIPTION:\nTitle: Nonlinear Optics with Rydberg Excitons\nValentin Walth er\, Aarhus University\n\nAbstract: The realization of exciton polaritons - - hybrid excitations of semiconductor quantum well excitons and cavity phot ons -- has been of great technological and scientific significance. In part icular\, the short-range collisional interaction between excitons has enabl ed explorations into a wealth of nonequilibrium and hydrodynamical effects that arise in weakly nonlinear polariton condensates. Yet\, the ability to enhance optical nonlinearities would enable quantum photonics applications and open up a new realm of photonic many-body physics in a scalable and eng ineerable solid-state environment. \nIn this talk\, I will review recent ex perimental and theoretical progress on the creation and the features of exc itonic Rydberg states [1\,2]. Specifically\, I will outline a route to gian t optical nonlinearities in cavity-coupled semiconductors by exploiting the giant interactions between Rydberg excitons. We demonstrate that these opt ical nonlinearities can be vastly enhanced by several orders of magnitude a nd induce nonlinear processes at the level of single photons [3].\n\n[1] T. Kazimierczuk et al.\, Nature 514\, 343 (2014)\n[2] A. Chernikov et al. Phy s. Rev. Lett. 113\, 076802 (2014)\n[3] V. Walther\, J. Rohne & T. Pohl\, Na t. Comm. 9\, 1309 (2018) LAST-MODIFIED:20181004T152126Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20180927T123000 DTEND;TZID=America/New_York:20180927T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20180927T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Prediction of complex spatiotemporal evolution through m achine learning methods improved with the addition of observers\nSpeaker: P rof. George Tsironis\nDepartment of Physics University of Crete\nAbstract: Can we use machine learning (ML) to predict the evolution of complex\, chao tic systems? The recent Maryland-based work showed that the answer is con ditionally affirmative once we use some additional “help” provided by a ran dom bath and observers\, as defined through reservoir computing (RC) [1]. What about using other “standard” ML methods in forecasting the future of complex systems? The ETH-MIT group showed that the long-short-term-memory (LSTM) method may work in general spatiotemporal evolution of the Kuramoto type [2]. Our work (Crete-Harvard) focused on the following question: Un der what circumstances ML can predict spatiotemporal structures that emerge in complex evolution that involves nonlinearity as well as some form of st ochasticity? To address this question we used two extreme phenomena\, one being turbulent chimeras while the second involves stochastic branching. T he former phenomenon generates partially coherent structures in highly nonl inear oscillators interacting through short or long range coupling while th e latter appears in wave propagation in weakly disordered media. Examples of the former include biological networks\, SQUIDs (superconducting quantum interference devices)\, coupled lasers\, etc while the latter geophysical waves\, electronic motion in a graphene surface and other similar wave prop agation configurations.\n\nIn our work we applied and compared three ML met hods\, viz. LSTM\, RC as well as the standard Feed-Forward neural networks (FNNs) in the two extreme spatiotemporal phenomena dominated by coherence\ , i.e. chimeras\, and stochasticity\, i.e. branching\, respectively [3]. In order to increase the predictability of the methods we augmented LSTM (a nd FNNs) with observers\; specifically we assigned one LSTM network to each system node except for "observer" nodes which provide continual "ground tr uth" measurements as input\; we refer to this method as "Observer LSTM" (OL STM). We found that even a small number of observers greatly improves the d ata-driven (model-free) long-term forecasting capability of the LSTM networ ks and provide the framework for a consistent comparison between the RC and LSTM methods. We find that RC requires smaller training datasets than OLST Ms\, but the latter requires fewer observers. Both methods are benchmarked against Feed-Forward neural networks (FNNs)\, also trained to make predicti ons with observers (OFNNs).\n\n[1] Z. Lu Z\, J. Pathak\, B. Hunt\, M. Girva n\, R. Brockett and E. Ott\, Reservoir observers: Model free inference of unmeasured variables in chaotic systems. Chaos 27\, 041102 (2017)\; J. Path ak\, B. Hunt\,M. Girvan\, Z. Lu and E. Ott\, Model-free prediction of larg e spatiotemporally chaotic systems from data: A reservoir computing approac h\, Phys. Rev. Let. 120\, 024102 (2018)\n[2] P. R. Vlachas\, W. Byeon\, Z. Y. Wan\, T. P. Sapsis and P. Koumoutsakos\, Data-driven forecasting of high -dimensional chaotic systems with long short-term memory networks. Proc.R.S oc.A 474\, 20170844 (2018).\n[2] G. Neofotistos\, M. Mattheakis\, G. D. Ba rmparis\, J. Hizanidis\, G. P. Tsironis and E. Kaxiras\, Machine learning with observers predicts complex spatiotemporal evolution\, arXiv 1807.10758 (2018) LAST-MODIFIED:20180921T204808Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201109T200000Z DTEND:20201109T210000Z DTSTAMP:20260828T094430Z UID:2n1v29be47e4mkrajruuqh1864@google.com CREATED:20200908T185529Z DESCRIPTION:Speaker: Linda Xu\, Harvard University\n\nSeminar to be conduct ed via Zoom.\n\nTitle: Thermal Dark Sectors in the Early and Late Universe\ n\n\nAbstract: One of the puzzles that the newly data-rich fields of cosmol ogy and astrophysics are most advantaged to tackle is the nature of the dar k sector. In particular\, a dark sector that thermalizes with the SM bath at some epoch has present-day observable properties that are directly tied to early-universe interactions. In this talk I survey some recent work on d etecting different types of thermal dark particles by leveraging different cosmological and astrophysical datasets. I discuss the utility of each of these different probes\, the implication for particle theories\, and prospe cts for the future. \n\nFor zoom link please contact mknouse@umd.edu LAST-MODIFIED:20201030T155917Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200131T180000Z DTEND:20200131T183000Z DTSTAMP:20260828T094430Z UID:3so4tfj0ui5olv37hm0krj6km7@google.com CREATED:20200127T162046Z DESCRIPTION:
    "Towards Novel Quantum Materials: Design\, Synthesis and Characterizations."
    Ruidan Zhon g\, Princeton University


    Abstract: Quantum materials are mat erials where the extraordinary effects of quantum mechanics give rise to ex otic and often incredible properties. To understand their basic behavior if we are to enable optimization for a specific purpose\, discovering novel q uantum materials is a primary task for scientists in the field of condensed matter physics and materials science. In this seminar\, research strategie s toward novel quantum materials in experiment will be introduced from the perspective of chemistry\, materials science and physics. Such research pro cess leads to fruitful results\, and two recent discovered candidates of qu antum spin liquid (QSL) will be presented as an example. The first candidat e is a geometric frustrated magnet\, Na2BaCo(PO4)2\, which is structurally perfect without intrinsic disorder. Experimental results\, including magnet ization\, specific heat\, and neutron scattering\, have indicated that this compound is an ideal QSL candidate. The second compound\, BaCo2(AsO4)2\, a re believed to be a Kitaev QSL candidate. This is the first time that Kitae v physics are proposed to be realized in 3d-transition-metal honeycomb in e xperiment. Non-Kitaev interactions can be fully suppressed by low field\, y ielding nonmagnetic ground state and many other similarities with the well- studied Kitaev QSL a-RuCl3.


    For additional information\, please follow this link to the M SE events page. We look forward \;to seeing you there! LAST-MODIFIED:20200127T162046Z LOCATION:2110 of the Chemical and Nuclear Engineering Building (#90). SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Sci/Eng Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201013T171500Z DTEND:20201013T181500Z DTSTAMP:20260828T094430Z UID:5lil6bk7pd88rv77oe4th3s99p@google.com CREATED:20200923T160303Z LAST-MODIFIED:20200923T160303Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200313T170000Z DTEND:20200313T180000Z DTSTAMP:20260828T094430Z UID:5kgr0rke0nb39qp0enobi7fqnq@google.com CREATED:20200122T134556Z DESCRIPTION:Speaker: Li Na Quan\, University of California Berkeley\n\nTitl e: TBA\n\nAbstract: TBA LAST-MODIFIED:20200203T151618Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190930T110000 DTEND;TZID=America/New_York:20190930T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20190930T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Band Engineering for Quantum Simulation in Circuit QED \ n\nSpeaker: Alicia J. Kollár\, UMD\n\nAbstract: The field of circuit QED ha s emerged as a rich platform for both quantum com- putation and quantum sim ulation. Lattices of coplanar waveguide (CPW) resonators realize artificial photonic materials in the tight-binding limit. Combined with strong qubit- photon interactions\, these systems can be used to study dynamical phase tr an- sitions\, many-body phenomena\, and spin models in driven-dissipative s ystems. I will show that these waveguide cavities are uniquely deformable a nd can produce lattices and networks which cannot readily be obtained in ot her systems\, including periodic lattices in a hyperbolic space of constant negative curvature. Furthermore\, I will show that the one-dimensional nat ure of CPW resonators leads to degenerate flat bands and that criteria for when they are gapped can be derived from graph-theoretic techniques. The re sulting gapped flat-band lattices are difficult to realize in standard atom ic crys- tallography\, but readily realizable in superconducting circuits. LAST-MODIFIED:20190916T180047Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191021T203000Z DTEND:20191021T213000Z DTSTAMP:20260828T094430Z UID:7pnt3ue1a7cmdmhd16uhf864ei@google.com CREATED:20191002T232646Z DESCRIPTION:Title: LIGO-Virgo Gravitational-Wave Findings So Far\, and Curr ent Events\n\nSpeaker: Peter Shawhan\, Department of Physics\, University o f Maryland\n\nAbstract: The first two observing runs of the Advanced LIGO a nd Advanced Virgo detectors\, in 2015-2017\, yielded 11 confidently-detecte d gravitational-wave events. Careful analysis of these events has provided insights about short gamma-ray bursts\, enabled tests of general relativity \, measured the Hubble Constant\, and given a picture of the population of compact binary systems. I will summarize several of the published findings from that event sample and then go on to describe the event candidates dete cted so far in the O3 observing run\, which is now at its halfway point. Wi th 33 candidate events identified in O3 data and shared with the astronomic al community so far\, the O3 run promises to significantly improving our un derstanding of the population of merging compact binaries and the tests we can perform.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20191002T232646Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200428T160000 DTEND;TZID=America/New_York:20200428T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200428T160000 CREATED:20190530T191015Z DESCRIPTION:
    Irving and Renee Milchberg Endowed Lecture< /a>

    Speaker: James Glanz\, The New York Times

    < br>We hope to reschedule in Fall 2020.
     LAST-MODIFIED:20200402T154018Z LOCATION:1412 Toll Lecture Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161024T110000 DTEND;TZID=America/New_York:20161024T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161024T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Oskar Painter\n\nAffiliation: Institute for Quant um Information and Matter and Thomas J. Watson\, Sr.\, Laboratory of Applie d Physics\, California Institute of Technology\, Pasadena CA 91125 USA\n\nT itle: Integrated optomechanical and superconducting quantum circuits \n\nAb stract: I will present recent work at Caltech on the integration of optome chanical crystals for light and sound with electronic superconducting quant um circuits. Utilizing the silicon-on-insulator (SOI) wafer platform\, we have made key advances in the fabrication and integration of extremely low loss microwave phonon structures and low loss microwave superconducting res onators of high impedance. These technical advancements offer several intr iguing opportunities for quantum information processing and networking with phonons\, photons\, and electrons in an integrated\, wafer-scale platform. The focus of my talk will be on two examples of our efforts in this direc tion: (i) nonreciprocal photon transport and amplification arising from syn thetic magnetic flux and reservoir engineering in an optomechanical crystal circuit\, and (ii) waveguide-QED systems consisting of microwave-bandgap c ircuits with embedded transmon-like qubits. \n LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191001T171500Z DTEND:20191001T181500Z DTSTAMP:20260828T094430Z UID:5kbgviah4kh93d8iosi3n4as89@google.com CREATED:20190910T135331Z DESCRIPTION:Speaker: Mr. Teddy Baker\, UMCP\n\nTitle: Local Molecular Field Theory for Non-Equilibrium Systems\n\nAbstract: Local Molecular Field (LMF ) theory is a framework for self-consistently modeling the long range force s of a statistical system without explicit Ewald summation. This theory was formulated in the equilibrium context\, being an extension of the Weeks Ch andler Andersen (WCA) theory to inhomogeneous systems. This work attempts t o extend the general framework into the nonequilibrium regime. We start by formally generalizing the equilibrium derivation to the non-equilibrium con text using the BBGKY hierarchy\, and then consider practical implementation s using further approximations that could be useful for molecular dynamics simulations. The results also suggest a different approach to enhanced samp ling of particle densities\, coming from a generalized force balance approx imation. LAST-MODIFIED:20190918T150044Z LOCATION:1116 IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200505T160000 DTEND;TZID=America/New_York:20200505T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200505T160000 CREATED:20190530T191015Z DESCRIPTION:
    Ellen Williams\, UMD
    Science meets Politics: The status of clean energy innovation in M aryland \;  \; LAST-MODIFIED:20200402T153945Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201028T150000Z DTEND:20201028T160000Z DTSTAMP:20260828T094430Z UID:2ep6a7fea4eq9tn1f2m10go5kq@google.com CREATED:20200923T162107Z DESCRIPTION:Speaker: Dodson Group

    Title: Literature seminar for Thom as Howard

    Abstract: TBA

    ZOOM: \;https://umd.zoom.us/j/97060168954?pwd=OHhFTUdkNzEyNVkrODhhQkhTWE JLdz09 LAST-MODIFIED:20200923T162107Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200331T171500Z DTEND:20200331T181500Z DTSTAMP:20260828T094430Z UID:02n0mqbcqn16qc4a7piji32s50@google.com CREATED:20200326T173745Z LAST-MODIFIED:20200326T173745Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201113T180000Z DTEND:20201113T190000Z DTSTAMP:20260828T094430Z UID:023ffi8ife93h9bmj6ovf4enme@google.com CREATED:20200923T165726Z DESCRIPTION:Speaker: Maria Santore\, Professor\, Polymer Science and Engine ering\, University of Massachusetts

    Title: Using Tension and Curvatu re to Manipulate Patterning in Phospholipid Lamellae

    Abstract: Phosp holipid bilayers are the basis for cell membranes\, but they also represent a fascinating material with unique properties. \; In particular\, thes e lamella constitute nanometrically-thin cohesive fluids that can be free s tanding in the form of vesicles or supported on solids. \; Phospholipid bilayers can also undergo phase transitions\, accommodate protein-based an d other inclusions\, and form fascinating patterns. \; This talk explor es how curvature and tension can be manipulated to control pattern formatio n of phase separated solid domains in otherwise fluid phospholipid lamellae . \; We show how tension impacts solid domain growth and domain shape d uring nucleation and growth from the one phase region. Besides this influen ce on individual domains\, tension and curvature additional determine inter actions between solid domains within the fluid membrane\, reversibly dictat ing their separations and arrangements on length scales of microns and tens of microns. \; The resulting arrangements include arrays with rotation al and translational order\, and long range alignment of many domains into strings\, chevrons\, and networks. While relevant to protein segregation in biomembranes\, these behaviors further form the basis for dynamically patt erned contoured materials.

    Bio:

    Maria Santore is a professor of pol ymer science and engineering\, with a secondary appointment in chemical eng ineering\, at the University of Massachusetts at Amherst.

    Santore was trained formally as a chemical engineer\, obtaining her B.S. at Carnegie M ellon and Ph.D. at Princeton. Following her Ph.D.\, Santore’s postdoctoral studies of polymer glasses and blends in the Polymer Division at NIST in Ga ithersburg MD were supported by an NRC Postdoctoral Fellowship. She joined the Dept. of Chemical Engineering at Lehigh University as the Dana Assistan t Professor of Chemical Engineering and was promoted to associate professor in subsequent years. Santore was awarded the Alfred Nobel Robinson Award f or outstanding research in 1996 and was named the Class of 1961 Chaired Ass ociate Professor while at Lehigh. Following a sabbatical at the Institute f or Medicine and Engineering at the University of Pennsylvania\, she joined the University of Massachusetts Department of Polymer Science and Engineeri ng as a Full Professor.

    For 13 years\, Santore is served as a senior editor of \;Langmuir\, the ACS (American Chemical Society) Jou rnal of Surfaces and Colloids\, and currently serves as a section editor fo r the Elsevier Journal \;Current Opinion in Colloid and Interface S cience. \; She is a Fellow in the American Physical Society\, the American Association for the Advancement of Science\, and the American Chem ical Society. \; She was awarded the 2015 Hopper Lectureship in Enginee ring by the University of Pennsylvania. In 2018 she was the UMass Distingui shed faculty lecturer and was awarded the UMass Chancellor’s Medal. \;< /p>

    Santore’s research focuses on the translation of biological behaviors to synthetic materials\, focusing on the role of interfaces. \; She ha s developed new materials specifically for the manipulation of particles an d cells\, holding 5 patents in this area. \; Her recent interests inclu de synthetic materials that control the dynamic aspects of bioadhesion and cell response\, cell manipulation especially the capture\, killing\, and re lease of cells\, and mechanical and chemical communications between cells a nd materials. \; In creating these novel functional materials\, Santore often attends to the details of how nanoparticles\, polymers\, dendrimers and proteins are arranged at interfaces to achieve synergistic behaviors th at would not occur in solutions.


    Where: via Zoom Sherri Ta tum \;stat um12@umd.edu \; \;

    LAST-MODIFIED:20200930T161043Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190306T210000Z DTEND:20190306T220000Z DTSTAMP:20260828T094430Z UID:0jidinkkgdpqofku2uub8vd33m@google.com CREATED:20190227T143310Z DESCRIPTION:Title : Mapping the Sawtooth\n\nSpeaker: Chris Smiet\, Princeto n Plasma Physics Laboratory \n\nAbstract : The topological changes that occ ur in a tokamak during a sawtooth oscillation are strongly constrained by t he fact that the magnetic field constitutes a 2.5 degree of freedom Hamilto nian system. Its structure is exposed by repeatedly mapping a poloidal cros s-section to itself along the magnetic field lines to produce a Poincare pl ot\, where the topologically stable fixed points of this mapping correspond with x- and o-points. We perform 3d numerical simulations of a sawtoothing tokamak discharge and calculate the location and Greene's Residue of these fixed points. The field evolves through a series of bifurcations where fix ed points are split or combined according to rules that conserve topologica l index and the cycle culminates in the annihilation of the magnetic axis w ith an x-point from the broken (1\,1) rational surface. The subsequent topo logical changes after the crash are not caused by tearing of any intact res onant surface\, but by the lowering safety factor shifting the field into r esonance with present nonaxisymmetric flux. As a consequence the (1\,1) rat ional surface need not be healed for a sawtooth cycle to occur. The develop ed topological framework explains the Kadomtsev-like process in the simulat ion but the topological constraints are applicable to any model for the saw tooth. LAST-MODIFIED:20190227T143320Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190215T170000Z DTEND:20190215T174000Z DTSTAMP:20260828T094430Z UID:1tdj40s4icc51c7rmfkfkikc0p@google.com CREATED:20190206T205315Z DESCRIPTION:Title: Momentum-space entanglement of disordered one-dimensiona l fermions after a quantum quench\n\nSpeaker: Rex Lundgren\, JQI\n\nAbstrac t: We investigate the momentum-space entanglement entropy and spectrum of s everal disordered one-dimensional free-fermion systems that circumvent Ande rson localization\, such as the random-dimer model\, after a quantum quench . We numerically observe two different types of momentum-space entanglement entropy dynamics\, an interesting slow logarithmic-like growth followed by saturation or rapid saturation. The type of dynamics one observes depends on the Fermi level of the intial state and the scattering matrix element st ructure in momentum-space. We then discuss when the momentum-space entangle ment spectrum reveals the presence of delocalized states after a quench in these systems. We find if there are vanishing momentum-scattering states\, the momentum-space entanglement spectrum clearly reveals the presence of de localized states for long times.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190206T205315Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190228T123000 DTEND;TZID=America/New_York:20190228T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190228T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Lagrangian-chaos and passive scalar turbulence\nSpeaker: Jacob Bedrossian\nUniversity of Maryland | Department of Mathematics\n\nAb stract: The purpose of this work is to perform a mathematically rigorous st udy of Lagrangian chaos and passive scalar turbulence in incompressible flu id mechanics. We study the Lagrangian flow associated to velocity fields ar ising from various models of fluid mechanics subject to white-in-time\, Sob olev-in-space stochastic forcing in a periodic box. We prove that if the fo rcing satisfies suitable non-degeneracy conditions\, then these flows are c haotic in the sense that the top Lyapunov exponent is strictly positive. Ou r main results are for the 2D Navier-Stokes equations and the hyper-viscous regularized 3D Navier-Stokes equations (at arbitrary Reynolds number and h yper-viscosity parameters). For the passive scalar problem\, we study stati stically stationary solutions to the advection-diffusion equation driven by these velocities and subjected to random sources. The chaotic Lagrangian d ynamics are used to prove a version of anomalous dissipation in the limit o f vanishing diffusivity\, which in turn\, implies that the scalar satisfies Yaglom's 1949 law of passive scalar turbulence in over a suitable inertial range -- the constant flux law analogous to the Kolmogorov 4/5 law. To our knowledge\, this work is the first to provide a complete mathematical proo f of any such scaling law from fundamental equations of fluid mechanics. Th e work combines ideas from random dynamical systems (the Multiplicative Erg odic Theorem and an infinite dimensional variation of Furstenberg's Criteri on) with elementary approximate control arguments and infinite-dimensional hypoellipticity via Malliavin calculus. Joint work with Alex Blumenthal and Sam Punshon-Smith. LAST-MODIFIED:20190129T145939Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191119T160000 DTEND;TZID=America/New_York:20191119T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191119T160000 CREATED:20190530T191015Z DESCRIPTION:\nSpeaker: Dr. Félicie Albert (Lawrence Livermore National Labo ratory)\n\n\nTitle: X-ray sources from laser-plasma acceleration: developm ent and applications for high energy density sciences\nAbstract:\nBright so urces of x-rays\, such as synchrotrons and x-ray free electron lasers (XFEL ) are transformational tools for many fields of science. They are used for biology\, material science\, medicine\, or industry. Such sources rely on c onventional particle accelerators\, where electrons are accelerated to giga electronvolts (GeV) energies. The accelerating particles are also wiggled i n magnetic structures to emit x-ray radiation that is commonly used for mol ecular crystallography\, fluorescence studies\, chemical analysis\, medical imaging\, and many other applications. One of the drawbacks of synchrotro ns and XFELs is their size and cost\, because electric field gradients are limited to about a few 10s of MeV/M in conventional accelerators. \nThis se minar will review particle acceleration in laser-driven plasmas as an alter native to generate x-rays. A plasma is an ionized medium that can sustain e lectrical fields many orders of magnitude higher than that in conventional radiofrequency accelerator structures. When short\, intense laser pulses ar e focused into a gas\, it produces electron plasma waves in which electrons can be trapped and accelerated to GeV energies. This process\, laser-wakef ield acceleration (LWFA)\, is analogous to a surfer being propelled by an o cean wave. Betatron x-ray radiation\, driven by electrons from laser-wakefi eld acceleration\, has unique properties that are analogous to synchrotron radiation\, with a 1000-fold shorter pulse. This source is produced when re lativistic electrons oscillate during the LWFA process. \nAn important use of x-rays from laser plasma accelerators we will discuss is in High Energy Density (HED) science. This field uses large laser and x-ray free electron laser facilities to create in the laboratory extreme conditions of temperat ures and pressures that are usually found in the interiors of stars and pla nets. To diagnose such extreme states of matter\, the development of effici ent\, versatile and fast (sub-picosecond scale) x-ray probes has become ess ential. In these experiments\, x-ray photons can pass through dense materia l\, and absorption of the x-rays can be directly measured\, via spectroscop y or imaging\, to inform scientists about the temperature and density of th e targets being studied. \n\nWork performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contr act DE-AC52-07NA27344\, supported by the LLNL LDRD program under tracking c ode 13-LW-076\, 16-ERD-024\, 16-ERD-041\, supported by the DOE Office of Fu sion Energy Sciences under SCW 1476 and SCW 1569\, and by the DOE Office of Science Early Career Research Program under SCW 1575. LAST-MODIFIED:20190910T150810Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20160926T110000 DTEND;TZID=America/New_York:20160926T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20160926T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker Name: Steve Simon\n\nSpeaker Institution: University o f Oxford\n\nTitle: Topologically Ordered Matter and Why You Should be Inter ested\n\nAbstract: In two dimensional topologically ordered phases of matte r\, processes\ndepend on gross topology rather than detailed geometry. Thin king in 2+1\ndimensions\, particle world lines can be interpreted as knots or links\,\nand the amplitude for certain processes becomes a topological i nvariant\nof that link. While sounding rather exotic\, we believe that such phases\nof matter not only exist\, but have actually been observed in quan tum\nHall experiments\, and could provide a uniquely practical route to\nbu ilding a quantum computer. Possibilities have also been proposed for\ncre ating similar physics in systems ranging from superfluid helium to\nstronti um ruthenate to semiconductor-superconductor junctions to quantum\nwires to spin systems to cold atoms. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Topologically Ordered Matter and Why You Should be In terested TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20200203T210000Z DTEND:20200203T223000Z DTSTAMP:20260828T094430Z UID:5kijib322nrvl696c2csi5n37h@google.com CREATED:20200128T142703Z DESCRIPTION:Speaker: Arpan Kar\, Harish-Chandra Research Institute \n\nTit le: Indirect search for dark matter in current and upcoming radio observati ons\n\nAbstract: Any signature of a weakly interacting dark matter candidat e has not been detected yet at the high-energy colliders or in direct searc h experiments. Detection becomes even more difficult if its mass is close t o\, or higher than a TeV. On the other hand\, pair-annihilation or decay of dark matter particles in dark matter dense astrophysical objects like dwar f spheroidal galaxies may give rise to electron/positron pairs which in tur n lead to radio synchrotron signals. In this talk we will see that the upco ming radio telescope Square Kilometre Array (SKA) has the potential to obse rve these radio signals for dark matter masses not only at the GeV scale bu t also beyond a TeV. In addition\, we will also discuss how one can use the current and upcoming radio observations to constrain the coupled/hybrid pa rameter space of particle physics and galactic astrophysics. LAST-MODIFIED:20200128T142811Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190225T210000Z DTEND:20190225T220000Z DTSTAMP:20260828T094430Z UID:0970djr5nd6rr5fqgrtg2cn7cg@google.com CREATED:20190118T170130Z DESCRIPTION:Title: Ebola virus glycoprotein spike recruits cholesterol for efficient fusion\n\n\nSpeaker: Jinwoo Lee\, UMD\n\nNotes: http://marylandbi ophysics.umd.edu/seminars/\n\nAbstract: \n\nCholesterol serves critical rol es in membrane fusion of envelope viruses by modulating physical properties such as thickness and curvature of biological membrane. Ebola virus (EBOV ) belongs to the class 1 virus with HIV and Influenza and shares similar st ructural features. The membrane fusion of EBOV requires internal receptor N iemann-Pick C1\, which is cholesterol transporter\, reside in late endosoma l compartment and budding occurs in the plasma membrane where a relatively high concentration of cholesterol is located. Thus\, the importance of cho lesterol in EBOV membrane fusion needs to be characterized. Here we present that EBOV glycoprotein membrane proximal external region/transmembrane (MP ER/TM) domain recruits cholesterol to local environments for efficient fusi on. The fusion and virus-like particles (VLPs) entry assays show that chol esterol concentration in the viral membrane is more critical for efficient fusion event to occur. Cholesterol titration experiments using NMR reveale d that G660 is critical for cholesterol interaction. The G660L mutant shows the wider angle between MPER and TM compare to WT in DEER experiments and lost interaction with cholesterol in NMR experiments. The total internal re flection fluorescence (TIRF) microscopy experiment shows that cholesterol i n viral membrane enhances fusion kinetics and the probability of full fusio n events. The G660L mutant shows higher hemifusion probability and also exh ibited a cell entry efficiency of only about 25% of WT VLPs. Furthermore\, the cholesterol-lowering drug\, statin was tested in VLPs entry assay and s tatin treated VLPs entry efficiency was decreased compare to untreated. Tak en together\, glycoprotein and cholesterol interaction is important for eff icient membrane fusion of EBOV and cholesterol in the viral membrane is mor e critical in EBOV membrane fusion and statin as potential EBOV treatment c ocktail ingredient. LAST-MODIFIED:20190128T134232Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191030T200000Z DTEND:20191030T213000Z DTSTAMP:20260828T094430Z UID:19snbpn25svqslkeh8poc05f6n@google.com CREATED:20190619T185820Z DESCRIPTION:Speaker: Michael Fedderke\, Stanford University\n\nTitle: Axion Dark Matter Detection with CMB Polarization\n\nAbstract:\nIn this talk\, I will detail two ways to search for low-mass axion dark matter using cosmic microwave background (CMB) polarization measurements. These appear\, in pa rticular\, to be some of the most promising ways to directly detect fuzzy d ark matter. Axion dark matter causes rotation of the polarization of light passing through it. This gives rise to two novel phenomena in the CMB. Firs t\, the late-time oscillations of the axion field today cause the CMB polar ization to oscillate in phase across the entire sky. Second\, the early-tim e oscillations of the axion field wash out the polarization produced at las t-scattering\, reducing the polarized fraction (TE and EE power spectra) co mpared to the standard prediction. Since the axion field is oscillating\, t he common (static) ‘cosmic birefringence’ search is not appropriate for axi on dark matter. These two phenomena can be used to search for axion dark ma tter at the lighter end of the mass range\, with a reach several orders of magnitude beyond current constraints. I will present a limit from the washo ut effect using existing Planck results\, and discuss the significant futur e discovery potential for CMB detectors searching in particular for the osc illating effect. LAST-MODIFIED:20191017T143358Z LOCATION:PSC 2136 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201106T200000Z DTEND:20201106T213000Z DTSTAMP:20260828T094430Z UID:4fo14d21j7use5mnq4snsf02id@google.com CREATED:20201023T160246Z DESCRIPTION:
    < /table>
    Title : Mapping Dark Matter in th e Milky Way with Stellar Streams
    Speaker Name: Adrian Price-Whelan
    Sp eaker Institution : Simons Foundation/CCA
    Notes: Contact John Cullinan ( jcullina@umd.edu) for Zoom meeting in formation.
    Abstract : The Milky Way is currently the only galaxy in whi ch we can study the detailed kinematics of large numbers of individual star s\, as enabled by large stellar surveys like the Gaia Mission. Our Galaxy t herefore provides a unique laboratory to test predictions made by astrophys ical models of dark matter and galaxy assembly. Stellar streams\, formed fr om the disruption of stellar systems as they orbit\, are key tracers of mas s and interactions with substructure\, enabling us to study these predictio ns in a galactic environment. However\, many poorly understood physical pro cesses imprint on the phase-space structures of streams\, biasing current r esults and complicating interpretation of stream data. I will discuss recen t results both on understanding theeffects of time dependence on streams an d on characterizing and interpreting data for known streams. I will then co nnect this recent work with our ultimate goal of mapping the dark matter di stribution in the Milky Way to test astrophysical predictions of dark matte r theories using stellar streams. LAST-MODIFIED:20201023T160319Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190506T190000Z DTEND:20190506T200000Z DTSTAMP:20260828T094430Z UID:5b63i7uuu4nd8ria3m2nd4kkor@google.com CREATED:20190429T145854Z DESCRIPTION:Speaker: Grigory Torgovnikov\, Ph.D.\, University of Melbourne\ , Honorary Fellow of the School of Ecosystem and Forest Sciences\n\nTitle: Microwave Wood Modification Technology and its Applications\n\nAbstract: Lo w permeability of many wood species causes problems during timber manufactu ring including very long drying times\, large material losses after drying\ , and expensive drying processes. Impregnating low permeability timber with preservatives and resins is extremely difficult. In the pulp and paper ind ustry\, low permeability wood results in shallow chemical penetration\, req uires the use of small-sized chips\, high chemical usage\, and high energy consumption. New microwave (MW) technology provides solutions to many of th ese problems. Experimental studies into MW wood modification at 0.922\, 2.4 5 and 5.8 GHz revealed a dramatic increase in wood permeability when MW pow er is applied in the range of 250 to 1200 MJ/m3.\n\nPhysical and mechanical characteristics of modified wood also alter. MW process parameters were de veloped to provide reproducible levels of timber modification taking into c onsideration variations in species\, size\, and moisture content which prov ided a sound foundation for the new technology. Research results demonstrat e that this technology could be applied to any wood species.\n\nThe followi ng commercial applications were identified: the treatment of refractory woo d species with preservatives\, rapid drying of hardwoods\, growth and dryin g stress relief in timber\, and manufacturing of two new wood materials Tor gvin and Vintorg. Improvements in wood pulping properties could be obtained through MW modification of sawn timber\, logs\, and chips. Additionally\, the use of MW modified wood has significant advantages for superwood manufa cturing: radical reduction of delignification time\, possibility to effecti vely use low permeable species\, large timber cross section (up to 250x 250 mm)\, reduction of chemical consumption\, and improved environmental perfo rmance.\n\nThe cost of AU$28 to $69/m3 for MW wood conditioning is acceptab le to the industry and provides good commercial opportunities. LAST-MODIFIED:20190429T145926Z LOCATION:0108\, EGR (Glenn L. Martin Hall) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - SPECIAL SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201216T160000Z DTEND:20201216T170000Z DTSTAMP:20260828T094430Z UID:4kc650566eu2n6i8kn64sn253q@google.com CREATED:20201207T154119Z LAST-MODIFIED:20201207T154215Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190211T210000Z DTEND:20190211T220000Z DTSTAMP:20260828T094430Z UID:7e39s6qci71brb6ql6j5euctlj@google.com CREATED:20190118T165823Z DESCRIPTION:Title: Allosteric regulatory mechanisms in the Ras signaling ne twork \n\nSpeaker: Ruth Nussinov\, NCI/NIH\n\nNotes: http://marylandbiophy sics.umd.edu/seminars/\n\nAbstract: \n\nHow do Ras isoforms attain oncogeni c specificity at the membrane? Oncogenic KRas\, HRas\, and NRas differentia lly populate distinct cancers. How they selectively activate effectors and why is KRas4B the most prevalent are highly significant questions. We also ask how Ras activates its effectors\, including Raf and PI3K lipid kinase\, which are also among the most highly mutated proteins in cancer. Despite d ecades of studies\, major mechanistic questions are still unanswered. Broad ly\, we aim to figure out the hallmarks of oncogenic signaling in the cell. LAST-MODIFIED:20190131T211834Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190426T160000Z DTEND:20190426T164000Z DTSTAMP:20260828T094430Z UID:7lo4bt65l65qh7tb1opmbofpoo@google.com CREATED:20190417T153326Z DESCRIPTION:Title: Nearly optimal lattice simulation by product formulas\n\ nSpeaker: Yuan Su\, QuICS\n\nAbstract: Product formulas (aka Trotterization ) provide a straightforward yet surprisingly efficient approach to quantum simulation. We show that this algorithm can simulate an $n$-qubit Hamiltoni an with nearest-neighbor interactions evolving for time $t$ using only $(nt )^{1+o(1)}$ gates. While it is reasonable to expect this complexity---in pa rticular\, this was claimed without rigorous justification by Jordan\, Lee\ , and Preskill---we are not aware of a straightforward proof. Our approach is based on an analysis of the local error structure of product formulas\, as introduced by Descombes and Thalhammer and significantly simplified here . We prove error bounds for canonical product formulas\, which include well -known constructions such as the Lie-Trotter-Suzuki formulas. We also devel op a local error representation for time-dependent Hamiltonian simulation\, and we discuss generalizations to periodic boundary conditions\, constant- range interactions\, and higher dimensions. Combined with a previous lower bound\, our result implies that product formulas can simulate lattice Hamil tonians with nearly optimal gate complexity.\n\nNotes: Lunch served at 12:0 0 pm\, talk at 12:10 pm. LAST-MODIFIED:20190417T153326Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181212T160000Z DTEND:20181212T170000Z DTSTAMP:20260828T094430Z UID:76n9n7d6ed0un654roaabsgnkr@google.com CREATED:20181204T133523Z LAST-MODIFIED:20181204T133523Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190211T200000Z DTEND:20190211T213000Z DTSTAMP:20260828T094430Z UID:60maslt4djcaf2v1jil696uctc@google.com CREATED:20190128T172826Z DESCRIPTION:
    Matthew Low\, Fermila b

    Title: Disorder at the LHC
    Abstract: In this talk I will discuss how systems with a large num ber of degrees of freedom and disorder in their mass matrix can play a role in particle physics. I will discuss some known results in large N field th eory and random matrix theory. A model of N real scalar fields will be stud ied in the context of the LHC and HL-LHC\, showing that collider events wit h a large number of soft b-jets can be common.

    Slides
    LAST-MODIFIED:20190311T173334Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190412T160000Z DTEND:20190412T164000Z DTSTAMP:20260828T094430Z UID:6hamiqhkh76crli3aubji523sc@google.com CREATED:20190404T155821Z DESCRIPTION:Title: Cavity Quantum Eliashberg Enhancement of Superconductivi ty\n\nSpeaker: Jonathan Curtis\, JQI and CMTC \n\nAbstract: Driving a conve ntional superconductor with an appropriately tuned classical electromagneti c field can lead to an enhancement of superconductivity via a redistributio n of the quasiparticles into a more favorable non-equilibrium distribution – a phenomenon known as the Eliashberg effect. Here we theoretically consid er coupling a two-dimensional superconducting film to the quantized electro magnetic modes of a microwave resonator cavity. As in the classical Eliashb erg case\, we use a kinetic equation to study the effect of the fluctuating \, dynamical electromagnetic field on the Bogoliubov quasiparticles. We fin d that when the photon and quasiparticle systems are out of thermal equilib rium\, a redistribution of quasiparticles into a more favorable non-equilib rium steady- state occurs\, thereby enhancing superconductivity in the samp le. We predict that by tailoring the cavity environment (e.g. the photon oc cupation and spectral functions)\, enhancement can be observed in a variety of parameter regimes\, offering a large degree of tunability.\n\nNotes: Lu nch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190404T155821Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200129T160000Z DTEND:20200129T170000Z DTSTAMP:20260828T094430Z UID:3h0i36l5v5lj0atopl770t79pf@google.com CREATED:20200121T165913Z LAST-MODIFIED:20200121T181840Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190207T123000 DTEND;TZID=America/New_York:20190207T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190207T123000 CREATED:20190115T151128Z DESCRIPTION:Title: Propagation of Ultrashort\, Intense Laser Pulses Through the Atmosphere\nSpeaker: Joseph Peñano\nNaval Research Laboratory \n\nAbst ract: The propagation of ultra-short (~100 fs)\, intense (~10–100 TW/cm2) l aser pulses in the atmosphere is rich in nonlinear physics and may have a b road range of applications. Experiments using terawatt pulses with duration s less than a picosecond demonstrate the formation and long-distance propag ation of plasma and optical filaments\, white light generation\, and the em ission of secondary radiation far from the laser frequency. Controlling the propagation of these laser pulses over long atmospheric paths is scientifi cally and technologically challenging. In this talk\, we discuss the variou s physical mechanisms governing the atmospheric propagation of ultrashort l aser pulses and report on several theoretical\, computational\, and experim ental studies carried out by the Naval Research Laboratory (NRL). These stu dies include recent experiments demonstrating extended channeling through v ery strong atmospheric turbulence enabled by nonlinear self-focusing of las er pulses in air. In addition\, we discuss theoretical considerations for i ncreasing the laser power that can propagated through the atmosphere. LAST-MODIFIED:20190129T144146Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200220T153000 DTEND;TZID=America/New_York:20200220T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200312T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:0s7ms3ct4sb3ojumcormsgv5jm@google.com CREATED:20200213T164329Z DESCRIPTION:Kitaev's 10-fold way (cont'd) - RIT on Geometry and Physics

    Speaker: Eric Kuo (UMD Physics)

    When: Thu\, February 20\, 2020 - 3:30pm
    Wher e: MTH (Kirwan Hall) 1313 LAST-MODIFIED:20200213T171845Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Kitaev's 10-fold way (cont'd) - RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191127T160000Z DTEND:20191127T170000Z DTSTAMP:20260828T094430Z UID:7urh4il3en500q7em6hpla3aed@google.com CREATED:20191112T161331Z LAST-MODIFIED:20191112T161331Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR - THANKSGIVING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200302T213000Z DTEND:20200302T223000Z DTSTAMP:20260828T094430Z UID:2ggga6k51iehq0t18j9igo246q@google.com CREATED:20200219T043913Z DESCRIPTION:Title: The Cool Side of Galactic Winds\n\nSpeaker: Sylvain Veil leux\, Dept. of Astronomy\, University of Maryland\n\nAbstract: Galactic wi nds impact ongoing star formation and black hole activity in their hosts an d deposit mass and energy into their halos and the intergalactic medium. Ma jor outstanding questions remain\, however\, about the precise impact that galactic winds make. In particular\, the exact nature of the neutral and mo lecular gas phases in these winds is still unclear. This seminar will highl ight the recent discovery of powerful atomic and molecular winds in nearby galaxies and quantify the role of quasars in driving these winds.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30 LAST-MODIFIED:20200219T043913Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200214T180000Z DTEND:20200214T190000Z DTSTAMP:20260828T094430Z UID:05fe26kospl9nilvlh50npcfbm@google.com CREATED:20200122T133827Z DESCRIPTION:Speaker: You Zhou\, Postdoctoral Fellow\, Harvard University\, Chemistry and chemical Biology

    Title: Controlling Light-Matter Inter actions Using Two-Dimensional Materials and Heterostructures

    Abstrac t: The study of interactions between light and matter has played a central role in the development of quantum physics and underlies a range of technol ogies\, including lasers and solar cells. Recent efforts to control light-m atter interactions promise to bolster new applications\, such as quantum in formation processing\, but remain challenging due to our limited ability to tailor the properties of optical materials.

    In this talk\, Zhou will des cribe how recent materials innovations — in particular\, the fabrication of two-dimensional semiconductors and their heterostructures — open up exciti ng new avenues for controlling light-matter interactions. First\, he will d iscuss efforts to improve the quality of atomically thin semiconductors and to understand their fundamental optical properties. He will then show how this fundamental understanding\, along with careful engineering of their ph otonic environment\, enables us to dramatically modulate the photoluminesce nce lifetime of excitons in these 2D semiconductors. Finally\, he will demo nstrate how manipulating new degrees of freedom in creating 2D heterostruct ures\, such as the twist angle between different layers\, leads to new ways to engineer light-matter interactions at the nanoscale.

    LAST-MODIFIED:20200203T151102Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181126T110000 DTEND;TZID=America/New_York:20181126T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181126T110000 CREATED:20180829T133041Z DESCRIPTION:Title: Superconducting field-effect transistors go metal\n\nSpe aker: Francesco Giazotto\, Scuola Normale Superiore di Pisa\n\nAbstract: In their original formulation of superconductivity\, the London brothers pred icted more than eighty years ago the exponential suppression of an electros tatic field inside a superconductor over the so-called London penetration d epth\, λ\nL\n\, in analogy to the Meissner-Ochsenfeld effect. Despite a few experiments indicating hints of perturbation induced by electrostatic fiel ds\, no clue has been provided so far on the possibility to manipulate conv entional superconductors via field-effect. In this talk\, I will report the evidence of full field-effect control of the supercurrent in all-metallic transistors made of different BCS superconducting thin films [1]. At low te mperature\, our field-effect transistors (FETs) show a monotonic decay of t he critical current under increasing electrostatic field up to total quench ing for gate voltage values as large as ±40V in titanium-based devices. Thi s bipolar field effect persists up to ∼ 85% of the critical temperature (∼ 0.41K)\, and in the presence of sizable magnetic fields. A similar behavior \, though less pronounced\, was observed in aluminum thin film FETs [1]. A phenomenological theory accounts for our observations\, and provides a desc ription compatible with an electric field-induced non-local perturbation pr opagating deeply inside the superconducting film. In our interpretation\, t his affects the pairing potential\, and quenches the supercurrent.\nMoreove r\, I will show the experimental realization of Ti-based Dayem bridge field -effect transistors (DB − FETs) [2\, 3] able to control the Josephson criti cal current (I\nC\n) of the superconducting channel. Our easy fabrication p rocess DB − FETs show symmetric full suppression of I\nC\nfor an applied cr itical gate voltage as low as V\nG\nC ~ ±8V at temperatures reaching about the 85% of the record critical temperature 550mK for titanium. Our devices show extremely high values of transconductance (up to 15μA/V) and variation s of Josephson kinetic inductance with gate voltage of two orders of magnit ude.\nFinally\, I will show the behavior of mesoscopic superconductor-norma l metal-superconductor (SNS) Josephson field-effect transistors which will reveal as well the impact of intense electrostatic fields even on proximity metals. All this seems to suggest that the field effect is universal\, i.e .\, it can affect either genuine or proximity fully-metallic superconductor s.\nBesides shedding light on a key issue in physics\, these results repres ent a groundbreaking asset for the realization of an all-metallic supercond ucting field-effect electronics and leading edge quantum information archit ectures based on Josephson FETs. Possible electronic and circuital schemes based on this all-metallic technology will be furthermore discussed.\nRefer ences [1] G. De Simoni\, F. Paolucci\, P. Solinas\, E. Strambini\, and F. G iazotto\, Nat. Nanotechnol. 13\, 802 (2018). [2] F. Paolucci\, G. De Simoni \, E. Strambini\, P. Solinas\, and F. Giazotto\, Nano Lett. 18\, 4195 (2018 ). [3] F. Paolucci\, G. De Simoni\, P. Solinas\, E. Strambini\, N. Ligato\, P. Virtanen\, A. Braggio\, and F. Giazotto\, arXiv:1808.00353. LAST-MODIFIED:20181119T123909Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201103T181500Z DTEND:20201103T191500Z DTSTAMP:20260828T094430Z UID:11titn71d620c50o3ddfdnfqk6@google.com CREATED:20200923T160729Z DESCRIPTION:Speaker: Gili Bisker\, \;Department of Biomedical Engineeri ng\, Faculty of Engineering
    The Center for Physics and Chemistry of Livi ng Systems at Tel Aviv University
    Tel Aviv University\, Israel
    Title:  \;Nonequilibrium Features of Life \; \;

    Abstract: Far-f rom-equilibrium processes constantly dissipate energy while convertin g a free-energy source to another form of energy. Living systems\, for ex ample\, rely on an orchestra of molecular motors that consume chemical fuel to produce mechanical work. In this talk\, I will describe two features of life\, namely\, time-irreversibility\, and nonequilibrium self-assembly.
    Time irreversibility is the hallmark of nonequilibrium dissipative pr ocesses. Detecting dissipation is essential for our basic understandin g of the underlying physical mechanism\, however\, it remains a cha llenge in the absence of observable directed motion\, flows\, or f luxes. Additional difficulty arises in complex systems where
    many intern al degrees of freedom are inaccessible to an external observer. I will
    i ntroduce a novel approach to detect time irreversibility and estimate the entropy production from time -series measurements\, even in the abs ence of observable
    currents. This method can be implemented in sc enarios where only partial information is available and thus provides a new tool for studying nonequilibrium phenomena.
    Further\, I will explo re the added benefits achieved by nonequilibrium driving
    for self-assemb ly\, identify distinctive collective phenomena that emerge in a
    nonequil ibrium self-assembly setting\, and demonstrate the interplay between t he assembly speed\, kinetic stability\, and relative population of dy namical attractors.

    1. Gili Bisker\, Nature Physics\, (2020)

    2. Ignacio A. Martínez*\, Gili Bisker*\, Jordan M. Horowitz\, Juan M.R. Par rondo\, Nature
    Communications \, 10(1)\, (2019)

    3. Gili Biskerand Jeremy L. England\, PNAS\, 115 (45)\, (2018)

    4. Gili Bisker\, Matte o Polettini\, Todd R. Gingrich\, and Jordan M. Horowitz\,
    Journal of Sta tistical Mechanics: Theory and Experiment (9)\, 093210 (2017)

    ZOOM:& nbsp\;https://umd.zoom.us/j/97909817193?pwd=Yzh4NXN2c2FLNnkwNE8zdGMvZ GwzQT09 LAST-MODIFIED:20201028T162023Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190130T190000Z DTEND:20190130T203000Z DTSTAMP:20260828T094430Z UID:60620lqbmg6251a207m49hbdb7@google.com CREATED:20190128T155028Z DESCRIPTION:Speaker: Yannick Meurice\, University of Iowa LAST-MODIFIED:20190130T154820Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201008T160000Z DTEND:20201008T170000Z DTSTAMP:20260828T094430Z UID:0kjfspmgic94mrah2mv6m6ad7q@google.com CREATED:20200914T233909Z DESCRIPTION:
    Title: Harnessing biosystems for quantum information scienc e \;

    Speaker: \;Philip Kurian\, Philip Kurian\, Principal In vestigator and Founding Director\, Quantum Biology Laboratory\, Howard Univ ersity

    Abstract: \;It is well known that architectures for quant um sensing and quantum information processing require exceptional isolation from sources of decoherence\, including electromagnetic and thermal noise\ , by shielding and cooling. Could robust room-temperature alternatives be e nvisioned using biosystems that are optimized for certain quantum processes in warm\, wet\, and wiggly environments? We will explore in this seminar a number of collective and cooperative effects that can provide mechanisms t o enhance coherent phenomena at multiple scales\, including superradiance\, optomechanical pumping far from equilibrium\, many-body dispersion\, and s pin filtering through chiral molecules. Such exciton\, phonon\, plasmon\, m agnon\, and other quantized effects may be exploited to develop novel platf orms for quantum biosensing\, opening avenues for the tantalizing realizati on of a test-tube quantum biocomputer and advanced biomedical diagnostics a nd therapeutics.

     \;

    About the Quantum Biology Laboratory :

    With a transformative vision that extends from the subatomi c to the clinical scale\, the QBL studies how collective behaviors in livin g matter can be manifested\, controlled\, and exploited for the development of advanced tools\, diagnostics\, and therapies to address neurodegenerati ve\, oncological\, immunological\, and oxidative metabolic disorders. Inves tigators in the QBL use tools from theoretical physics\, condensed matter\, quantum optics\, molecular biology\, biochemistry\, genomics\, spectroscop y\, and high-performance computing to solve an array of problems relevant t o human disease processes and clinical medicine. The QBL is now hiring for a postdoctoral research associate - for more information\, visit \;www.quantumb iolab.com/postdoctoral-associate.html.


    This Sem inar may be attended by joining the Zoom Meeting
    https://umd.zoom.us/j/99949243235

    Meet ing ID: 999 4924 3235

    LAST-MODIFIED:20200925T164223Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190924T160000 DTEND;TZID=America/New_York:20190924T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20190924T160000 CREATED:20190530T191015Z DESCRIPTION:\nMaissam Barkeshli\, University of Maryland\n\nTitle: Splitti ng the electron: New aspects of electron fractionalization in quantum matte r LAST-MODIFIED:20190918T162016Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200226T183000Z DTEND:20200226T200000Z DTSTAMP:20260828T094430Z UID:3f5rhii64820qbbktlm547et97@google.com CREATED:20200221T195911Z DESCRIPTION:Title : "Observation of the Higgs Boson Decaying to Bottom Quar ks at CMS"
    Speaker Name: Christopher Palmer
    Speaker Institution : Pri nceton University


    Abstract : The Higgs boson decay to a bottom q uark-antiquark pair has been sought
    for decades by the high energy commu nity (i.e. at LEP and Tevatron).
    With the observation of the Higgs
    bo son at LHC during Run 1\, the search for this decay channel became
    sharp ly focused. As the bottom quark pair channel is the most
    probable decay of the Higgs boson (58%)\, its observation is both
    important in terms of quantifying the Higgs boson and it represents an
    important milestone in high energy physics. The results presented use
    datasets from the LHC Ru n 1 and Run 2 (2016+2017) from CMS. This Run
    2\, 13 TeV dataset correspo nds to an integrated luminosity of ~80
    fb^-1. The analysis strategy\, th e background estimation techniques\,
    and significant analysis improvemen ts from the 2017 data analysis in
    CMS are shown. An outlook on the upcom ing analysis of the full Run 2
    dataset (and beyond) will be discussed.&n bsp\; \;


    Host: Sally Megonigal LAST-MODIFIED:20200221T204029Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191018T160000Z DTEND:20191018T170000Z DTSTAMP:20260828T094430Z UID:6hta07gdvmr4bl8j6rtq15ov5s@google.com CREATED:20191010T124150Z DESCRIPTION:Title: Free probability theory and free approximation in physic al problems\n\nSpeaker: Oles Shtanko\n\nFriday 18 October\, 12:10-12:40pm\n (pizza and drinks served 10 min. before talk)\n\nAbstract: Suppose we know densities of eigenvalues/energy levels of two Hamiltonians HA and HB. Can w e find the eigenvalue distribution of the joint Hamiltonian HA+HB? Free pro bability theory (FPT) answers this question under certain conditions. My go al is to show that this result is helpful in physical problems\, especially finding the energy gap and predicting quantum phase transitions. As an exa mple\, I will consider generic artificial topological systems created by a periodic drive\, including Floquet Kitaev chain\, and show how FPT can be u sed to predict and characterize disorder- and noise-driven pha LAST-MODIFIED:20191010T124150Z LOCATION:Location: PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190923T190000Z DTEND:20190923T203000Z DTSTAMP:20260828T094430Z UID:4kjhrdsrg0jevhkmphq85j6dnf@google.com CREATED:20190620T145500Z DESCRIPTION:Speaker: Zhong-Zhi Xianyu\, Harvard\n\nTitle: Recent progress i n cosmological collider physics\n\nAbstract: Heavy particles can be produce d on shell during inflation and leave distinct signals in the correlations of density fluctuations. In this talk I will introduce the basics of this c osmological collider program\, and explain why it is in general difficult t o get visibly large signals. I will then describe some recent works along t his direction with fun physics and naturally large signals\, including seei ng heavy neutrinos\, probing CP violations\, and a scenario of Cosmological Higgs Collider where the Higgs interactions can be directly seen via modul ated reheating. LAST-MODIFIED:20190919T201151Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170206T110000 DTEND;TZID=America/New_York:20170206T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170206T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Ian Walmsley\, University of Oxford\n\nTitle: Networke d Quantum Information Technologies\n\nAbstract: Hybrid light-matter network s offer the promise for delivering robust quantum information processing te chnologies\, from sensor arrays to secure communications to quantum simulat ors and eventually to a quantum computer. Photonics plays a major role in d elivering new these new enhanced performance applications. I will describe recent science and engineering progress towards build a resilient\, scalabl e photonic quantum network LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190827T150000Z DTEND:20190827T160000Z DTSTAMP:20260828T094430Z UID:1338itkf6oqhsn17h5bqc4ks4s@google.com CREATED:20190820T131006Z LAST-MODIFIED:20190820T132551Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200311T190000Z DTEND:20200311T200000Z DTSTAMP:20260828T094430Z UID:6mvmf611tnls465oc3fl19fi4v@google.com CREATED:20200305T184728Z DESCRIPTION:Title : Integration of Thin Film\, Epitaxial Superconductors wi th Semiconductors

    Speaker Name: Dr. Virginia Wheeler


    Spea ker Institution : U.S. Naval Research Laboratory


    Abstract : Supe rconducting materials remain a critical enabler for many naval applications such as power generation and delivery\, SQUIDs for sensing\, and supercond ucting electronics such as low loss filters for electronic communication. A dditionally\, superconducting thin films have become increasingly necessary for fast\, secure\, low power digital devices for quantum navigation\, sen sing\, communication and computation systems. However\, to realize the pote ntial of many of these applications there is still a need to achieve practi cal superconductors with higher critical temperatures (Tc) and devices with longer coherence lifetimes. It is believed that a move towards epitaxial s uperconductor materials which can be directly integrated with semiconductor thin films and possess abrupt interfaces and fewer defects can significant ly impact the properties of the superconducting stacks developed for variou s applications. In this work\, we will present our recent results using bot h atomic layer deposition (ALD) and molecular beam epitaxy (MBE) to develop metal nitride superconductors and their epitaxial integration with other t hin films. Specifically\, we will discuss the development of MBE NbN and Ta 2N superconductors and their epitaxial integration with III-N materials in both HEMTs and nanolaminates with implications for devices such as Josephso n junctions (JJ). ALD TiN films deposited at NRL have exhibited excellent c onformality which could be useful for complex interconnects or filling tren ches with superconductors for non-planar applications. The impact of film t hickness and underlying substrate on Tc will be discussed as a generalized guide to determine the impactful areas of ALD superconductors. Finally\, si nce ALD is also useful for depositing low temperature epitaxial dielectrics as the barrier in a JJ device\, we will present initial results on integra ting epitaxial ALD AlN with epitaxial Al films on GaAs and silicon includin g the current advantages and limitations. \;
     \;

    Notes: 2 020 NEW VISITOR-POLICY: All colloquium attendees not possessing an LPS acce ss badge shall enter through the exterior side doors on the lower level. Ta ke the exterior stairs to the right of the LPS front doors down to the lowe r level\; the entry double doors will be immediately at the bottom of the s tairs. If elevator access is required\, use the phone to enter the lobby\, and someone will escort you to the elevator and down to the lower level. Up on entry and exit\, please sign in to and out of the logbook on the podium in the lower level entryway.
    Visitors to LPS wishing to access the upsta irs lab spaces must fill out and process a visitor request form and show a photo ID before admittance\, which is best done prior to arrival through an LPS employee. A visitor request form is NOT required if only attending the colloquium on the lower level.
    Access to the LPS lobby for information is permitted by using the phone to the far left of the main entry doors.

    For more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz.
    Note: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H bu ilding. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts . Please use the phone on the left hand side of the front door to call the receptionist for entry.


    Hosted by: David Bowen LAST-MODIFIED:20200305T184728Z LOCATION:Laboratory For Physical Sci\, 8050 Greenmead Dr\, College Park\, M D 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquium/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190204T110000 DTEND;TZID=America/New_York:20190204T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190204T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Advances in Quantum Spectral Estimation by Qubit Sensors \n\nSpeaker: Lorenza Viola\, Dartmouth\n\nAbstract: Accurately characterizi ng the spectral properties of environmental\nnoise in open quantum systems is both a prerequisite for quantitative\nmodeling and prediction\, and a ke y step toward optimizing control\nperformance for high-fidelity quantum inf ormation processing and\nquantum sensing applications. In realistic setting s\, simplifying\nassumptions such as Gaussianity or classicality of the noi se sources\nneed not be a priori obeyed\; furthermore\, interpreting the se nsor's\noutput may be complicated due to out-of-band spectral leakage. I wi ll\ndescribe recent theoretical advances in developing quantum control\nmet hods for spectral estimation by qubit sensors\, and outline\nproof-of-princ iple experimental validations using trapped-ion and\nsuperconducting qubit devices\, along with emerging challenges. LAST-MODIFIED:20190122T184950Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161017T110000 DTEND;TZID=America/New_York:20161017T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161017T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Darrick Chang\, ICFO\, Barcelona\n\nTitle: Enhancing a tom-light interactions with subradiant states\n\nAbstract: Establishing ef ficient quantum interfaces between light and atomic media forms the basis f or many important applications in quantum information science and metrology . The ultimate performance of such an interface is limited by the probabili ty of interacting with a preferred mode of light over all others (e.g.\, fr ee-space scattering)\, and leads to widely known figures of merit such as c ooperativity in cavity QED or optical depth in atomic ensembles. These figu res of merit are based upon the important assumption that scattering into f ree-space modes is independent\, and an intriguing question is whether they can be improved upon by exploiting collective subradiant states of atomic ensembles where such scattering is strongly suppressed. We begin by elucida ting the origin of subradiance in the elegant cases of free-space atomic la ttices in 1D and 2D\, where subradiance is associated with the existence of optical "guided modes" that cannot escape the lattice. We find that subrad iant states in these systems have well-defined spatial structure and decay at a rate dictated by the density of atomic excitations. We then show how t he optical depth limit can be exceeded by interfacing atomic lattices with nanophotonic structures. In particular\, atom-light interactions can be mad e highly efficient by exploiting "selectively subradiant" states\, whose co upling to the nanophotonic modes are collectively enhanced while free-space emission is collectively suppressed at the same time. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200127T160000 DTEND;TZID=America/New_York:20200127T173000 RRULE:FREQ=WEEKLY;UNTIL=20200602T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20200420T160000 EXDATE;TZID=America/New_York:20200427T160000 EXDATE;TZID=America/New_York:20200511T160000 EXDATE;TZID=America/New_York:20200504T160000 EXDATE;TZID=America/New_York:20200518T160000 EXDATE;TZID=America/New_York:20200525T160000 EXDATE;TZID=America/New_York:20200601T160000 DTSTAMP:20260828T094430Z UID:1or5rnerh7k9m5patv9kje2bo7@google.com CREATED:20200410T133902Z DESCRIPTION:Will be conducted through zoom.\n\nSpeaker: Kfir Blum\, Weizman n Institute of Science\n\nTitle:\nThermonuclear supernovae — is there a sup ernova bound on axions?\n\nAbstract:\nWe consider the possibility that some or all core-collapse supernovae are collapse-induced thermonuclear explosi ons (CITEs)\, rather than neutrino-driven explosions. Focusing on the neutr ino signal we show that the neutrino burst of SN1987A was compatible with C ITE and may hint at prompt black hole formation. Supernova constraints on n ew free-streaming particles (such as axions) would be avoided in this scena rio. LAST-MODIFIED:20200410T133902Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Kfir Blum\, Weizmann Institute of Science TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191107T190000Z DTEND:20191107T200000Z DTSTAMP:20260828T094430Z UID:3s9eaov1jjvebcnuqek9r9j9bv@google.com CREATED:20191024T140216Z DESCRIPTION:Title: Trivia(l) Night: What is a superconductor?\nSpeaker: Ni ck Pontiatowsky\, University of Maryland\nAbstract: \nThe diligent attendee of condensed matter colloquia has undoubtedly heard the off-handed remark that superconductors break electromagnetic gauge symmetry\, just as crystal s break translational symmetry or magnets break time-reversal symmetry. How ever\, despite the frequency with which it is made\, this statement is nons ensical: a gauge symmetry is a redundancy of our description of nature\, no t a physical symmetry which can be broken in a consistent theory. In this t alk\, we will interrupt our usual experimental programming to revisit the w ell-established (but deceptively subtle) means by which gauge symmetry "bre aks\," and doesn't\, in a superconductor and why this "breaking" defines th e superconducting state. In doing so\, we will be able to account for all o f the defining properties of superconductors using simple symmetry consider ations and learn a valuable lesson in why one shouldn't listen to particle physicists.\n\nHost: Local\n\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20191025T140630Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Nick Poniatowski TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201124T180000Z DTEND:20201124T190000Z DTSTAMP:20260828T094430Z UID:6ptfsfm2q02qr3beekkj5pvot3@google.com CREATED:20200930T163053Z LAST-MODIFIED:20200930T163053Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200914T203000Z DTEND:20200914T213000Z DTSTAMP:20260828T094430Z UID:3mnhn6epuapaukv8po1ukgmr9c@google.com CREATED:20200310T054212Z DESCRIPTION:Title: Massive Star Explosions: Pandora Boxes for Cosmic Ray Pa rticles and Maximally Rotating Black Holes?

    Speaker: Peter L Bierman n\, MPIfR\, Bonn\; KIT\, Karlsruhe\; Univ. of Alabama\, Tuscaloosa\; Univ. of Bonn

    Abstract: https ://space.umd.edu/Seminar/2020Fpdf/Lecture-2020-UMD-CRs-and-BHs_abstract.pdf

    Talk slides : http s://go.umd.edu/0914201630 LAST-MODIFIED:20201019T230943Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190208T170000Z DTEND:20190208T174000Z DTSTAMP:20260828T094430Z UID:7nl3l53suvbn38gq33i188gn1v@google.com CREATED:20190205T001415Z DESCRIPTION:Title: The chiral clock model in one dimension: duality and qua ntum field theory\n\nSpeaker: Seth Whitsitt\, JQI\n\nAbstract: Recent exper iments on one-dimensional Rydberg simulators display quantum phase transiti ons to spatially ordered crystals with a period of N sites [1]. These exper iments are capable of probing the universal Kibble-Zurek dynamics of the tr ansitions\, allowing experimental access to critical exponents [2]. For N>2 \, these transitions are in the same universality class as the Z_N chiral c lock model\, which exhibits a rich phase structure. In particular\, this mo del displays a direct continuous phase transition between a gapped symmetri c phase and a gapped phase with broken Z_N symmetry for certain values of N . I will present the universal quantum field theory for this transition\, w here the main theoretical tool is a non-local duality mapping to a theory d escribing the condensation of domain walls. A renormalization group analysi s of the field theory gives the first analytic predictions for the critical exponents\, which are compared to experimental and numerical results [3].\ n\n[1] Bernien et. al.\, Nature\, 551\, 579 (2017).\n[2] Keesling et. al.\, arXiv:1809.05540.\n[3] SW\, R. Samajdar\, S. Sachdev\, Phys. Rev. B.\, 98\ , 205118 (2018).\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. LAST-MODIFIED:20190205T001415Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190417T190000Z DTEND:20190417T203000Z DTSTAMP:20260828T094430Z UID:0dgqvgn6ev3q2seu1g2ofj4o61@google.com CREATED:20190226T142529Z DESCRIPTION:Ben Freivogel\, University of Amsterdam\n\nTitle: How to build a wormhole (How to prepare the thermofield double state)\n\nAbstract: Based mainly on https://arxiv.org/abs/1811.11528 . Given two copies of any quant um mechanical system\, one may want to prepare them in the thermofield doub le state for the purpose of studying thermal physics or black holes. Howeve r\, the thermofield double is a unique entangled pure state and may be diff icult to prepare. We propose a local interacting Hamiltonian for the combin ed system whose ground state is approximately the thermofield double. The e nergy gap for this Hamiltonian is of order the temperature. Our constructio n works for any quantum system satisfying the Eigenstate Thermalization Hy pothesis. LAST-MODIFIED:20190410T173637Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181023T160000 DTEND;TZID=America/New_York:20181023T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181023T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Sir John B. Pendry\, Imperial College\, London\nTitle: Capturing Light on The Nanoscale\n\nAbstract: Convention has it that light cannot resolve objects much smaller than the wavelength\, a 'rule' that wa s shown to be invalid some years ago. Here we look inside the wavelength a nd study the properties of plasmonic structures with dimensions of just a f ew nanometres: a tenth or even a hundredth of the wavelength of visible li ght\, where the ray picture of light fails utterly. We show how the new co ncept of transformation optics that manipulates electric and magnetic field lines rather than rays can provide an equally intuitive understanding of s ub wavelength phenomena and at the level of Maxwell's equations. The new technology brings light into contact with the nanoworld.\nHosted by Tom Mur phy LAST-MODIFIED:20190530T190803Z LOCATION:John S. Toll Physics Building\, Room 1412 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Paint Branch Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200206T123000 DTEND;TZID=America/New_York:20200206T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200206T123000 CREATED:20200109T211506Z DESCRIPTION:Title: Cell Dynamics and Excitable Systems\nSpeaker: Wolfgang L osert\nUniversity of Maryland | Department of Physics and IREAP\n\nAbstract : The guided migration of cells is a complex dynamical process involving ca refully regulated polymerization and depolymerization of the elements of th e cellular scaffolding\, in particular actin. Recent work has shown that po lymerizing and depolymerizing actin can be described as an excitable system which exhibits natural waves or oscillations on scales of hundreds of nm\, and that wave-like dynamics can be seen in a wide range of natural context s. I will show that physical signals nucleate and guide these the wave-like dynamics\, and that such guided actin waves control cell migration for a b road range of cell types. This opens up novel approaches to control cell be havior. LAST-MODIFIED:20200109T212548Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191031T180000Z DTEND:20191031T190000Z DTSTAMP:20260828T094430Z UID:72dut3vjn7vam6athb32okjj6p@google.com CREATED:20191016T150939Z DESCRIPTION:Title: 2D Magnets\, Heterostructures\, and Spintronic Devices \ nSpeaker: Cheng Gong\, University of Maryland\nAbstract: \nMagnetism\, one of the most fundamental physical properties\, has revolutionized significan t technologies such as data storage and biomedical imaging\, and continues to bring forth new phenomena in emerging materials and reduced dimensions. The recently discovered magnetic 2D van der Waals materials (hereafter abbr eviated as “2D magnets”) provide ideal platforms to enable the atomically-t hin\, flexible\, lightweight magneto-optic and magnetoelectric devices. The seamless integration of 2D magnets with dissimilar electronic and photonic materials further opens up exciting possibilities for unprecedented proper ties and functionalities. In this talk\, I will speak on our experimental o bservation of the 2D ferromagnet\, analyze the current progress and the exi sting challenges in this emerging field\, and show how we push the boundary by exploring the potential of 2D antiferromagnets for spintronics. \n\n\nH ost: (local)\n\nRefreshments 1:30pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20191025T140709Z LOCATION:John S Toll Physics Bldg Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Cheng Gong\, University of Maryland TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191106T203000Z DTEND:20191106T213000Z DTSTAMP:20260828T094430Z UID:33t39hgdebgjpf9c7a766cohhf@google.com CREATED:20191031T130945Z DESCRIPTION: \nTitle : Kinetic ballooning modes: From Theory to High-Densi ty Operation in W7-X\nSpeaker Name: Kseniya Aleynikova\nSpeaker Institution : Max-Planck Institut Fur Plasmaphysik\, Greifwald\n \nAbstract : Kinetic ballooning modes (KBMs) are investigated by means of analytical theory and linear electromagnetic gyrokinetic (GK) numerical simulations for different geometries. A physics-based ordering for beta (the ratio of kinetic to mag netic plasma pressure) with small asymptotic parameters is found. This allo ws us to derive several simplified limits of previously known theory and to identify regimes where quantitative agreement between theory and numerical simulations can be achieved.\n\nFor the axisymmetric case\, in simple s-α geometry\, it is found that\, for large pressure gradients\, the growth rat e and frequencies computed by the gyrokinetic code GENE show excellent agre ement with those evaluated by using a diamagnetic modification of ideal MHD .\n\nFor the stellarator geometry\, we extend the analyses of KBMs reported in Refs. [2\, 3]\, to cover high-density regimes in W7-X. In recent W7-X e xperiments (reported in [4])\, hydrogen pellet core fuelling was realized i n order to study effects of plasma pressure\, plasma stability and confinem ent. The central β (the ratio of the thermal to magnetic pressure) of above 3.5% were demonstrated. Such plasmas feature peaked density profiles and m ay potentially be prone to KBMs generation. Linear electromagnetic gyrokine tic simulations of finite-β plasmas in W7-X predict stability limit for str ongly destabilized KBMs\, which is consistent with the experimental observa tions of\, so-called\, MHD-like events during the high-density operation.\n \n[1] W.M. Tang\, J.W. Connor\, and R. J. Hastie\, Nucl. Fusion 20 \, 1439 (1980)\n[2] K. Aleynikova and A. Zocco\, Physics of Plasmas 24 \, 092106 (2 017)\n[3] K. Aleynikova\, et al\, Journal of Plasma Physics 84 (6)\, 2018.\ n[4] S. Bozhenkov et al\, 27th IAEA Fusion Energy Conference\, EX/P8-8\, 20 18.\n \n swisdak@umd.edu LAST-MODIFIED:20191031T130945Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200204T160000 DTEND;TZID=America/New_York:20200204T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200204T160000 CREATED:20190530T191015Z DESCRIPTION:\nMariangela Lisanti\, Princeton University\n\n\nTitle: Mappin g the Milky Way's Dark Matter Halo with Gaia\n\nAbstract: The Gaia mission is in the process of mapping nearly 1% of the Milky Way’s stars. This data set is unprecedented and provides a unique view into the formation history of our Galaxy and its associated dark matter halo. I will review results based on the most recent Gaia data release\, demonstrating how the evolutio n of the Galaxy can be deciphered from the stellar remnants of massive sate llite galaxies that merged with the Milky Way early on. The recent advance ments in our understanding of the Galaxy's evolution suggest that a compone nt of the local dark matter is not in equilibrium\, as typically assumed\, and instead exhibits distinctive dynamics. The updated dark matter map buil t from the Gaia data has ramifications for direct detection experiments\, w hich search for the interactions of these particles in terrestrial targets. LAST-MODIFIED:20200122T204910Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191120T203000Z DTEND:20191120T213000Z DTSTAMP:20260828T094430Z UID:2fiqj2bqc8kthtdvkg72a3ttku@google.com CREATED:20191118T151457Z DESCRIPTION:






    Title : Plasmoid Instability in Magnetic Reconnection and Magnetohydrodynamic Tu rbulence
    Speaker Name: Yi-Min Huang
    Speaker Institution : Princeton U niversity
     \;
    Abstract : The ubiquitous thin current sheets in hi gh-Lundquist-number space and
    astrophysical plasmas are known to be unst able to the plasmoid instability\, which
    disrupts current sheets to form smaller structures such as flux ropes and
    secondary current sheets. The plasmoid instability thus plays a significant role
    in magnetic reconnec tion and magnetohydrodynamic (MHD) turbulence. In this talk\,
    I will dis cuss the roles of the plasmoid instability in triggering the transition
    from slow to fast reconnection. Then I will talk about the interplay betwee n
    plasmoid instability and MHD turbulence\, including self-generated 3D turbulent
    reconnection mediated by the plasmoid instability\, as well as more recent results
    on plasmoid-mediated energy cascade in MHD turbulen ce. Finally\, I will also
    present some evidence of the plasmoid instabil ity in solar observations.




    swisdak@um d.edu





    LAST-MODIFIED:20191118T151457Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190503T170000Z DTEND:20190503T180000Z DTSTAMP:20260828T094430Z UID:23a7c9qedq83rabr36o7jhglcc@google.com CREATED:20190124T143033Z DESCRIPTION:Speaker: Professor\, Karen I. Winey\, MSE &\; ChBE\, Univers ity of Pennsylvania

    Title: Precise Polymers that Control Nanoscale M orphologies and Transport Properties

    Abstract: Acid- and ion- containing polymers have specific interactions that produce acid- or ion-ri ch aggregates arranged in hierarchical nanoscale morphologies and remarkabl e bulk properties. Untangling the correlations between the primary structu re of such associating polymers and their morphologies and properties has l ong been a challenge in polymer physics\, because most acid- and ion-contai ning polymers have random sequences of polar and non-polar monomeric units. New synthetic methods increasingly produce polymers with greater molecula r precision that provide greater uniformity of and control over the hierarc hical morphologies. Using primarily X-ray scattering experiments and atomi stic molecular dynamics simulations\, we have revealed a variety of new nan oscale morphologies in precise acid- and ion-containing polymers (layers\, branched aggregates\, gyroid). In addition to describing these new morphol ogies\, this seminar will present proton and ion conductivity results for a variety of precise polymers that demonstrate the importance of these new n anoscale morphologies. LAST-MODIFIED:20190425T183254Z LOCATION:2110 Chemical/Nuc Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190327T150000Z DTEND:20190327T161500Z DTSTAMP:20260828T094430Z UID:1jtf931hijeekkfsjrmamj0q3v@google.com CREATED:20190327T143933Z DESCRIPTION:Security of the Fiat-Shamir Transformation in the Quantum Rando m Oracle Model\nSpeaker: Serge Fehr (CWI-Amsterdam) \nTime: Wednesday\, Mar ch 27\, 2019 - 11:00am \nLocation: ATL 3100A \nIn this presentation\, I wil l first recall the Fiat-Shamir\ntransformation\, which is an important desi gn principle for\nnon-interactive zero-knowledge proofs and for digital sig nature schemes.\nIn order to rigorously analyze the security of this transf ormation\, one\ntypically considers an idealized model\, the so-called rand om oracle\nmodel (ROM)\, which treats cryptographic hash functions as ideal objects.\nIt is well known that (in the ROM) the Fiat-Shamir transformatio n\npreserves the security properties one cares about. However\, the proof\n for this result breaks down in the quantum setting where the attacker is\na llowed to make superposition queries to the random oracle. Indeed\, the\nse curity of the Fiat-Shamir transformation against a quantum attack was\nlarg ely open\; only some limited results were know\, and some negative\nclaims were actually made in the literature.\nHaving set up the stage\, I will the n discuss our recent result\, which\nshows full-fledged security of the Fia t-Shamir transformation against\nquantum attacks\, i.e.\, in the so-called quantum ROM. I will give some\nhigh-level intuition for our result\, but wi ll also go through the\ntechnical proof\, which after all is quite simple.\ nIn the last part\, I will briefly introduce a modification to a security\n definition for interactive proofs\, which allows us to relativize a\ncertai n negative result\, and which then makes our result on the\nFiat-Shamir tra nsformation relevant for a larger class of schemes. LAST-MODIFIED:20190327T143933Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:3100A: QuICS Seminar-Serge Fehr TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201116T210000Z DTEND:20201116T220000Z DTSTAMP:20260828T094430Z UID:7no656i9935ts8dit0obdqm0qk@google.com CREATED:20200922T142451Z DESCRIPTION:Speaker: \;Alexander Sobolevsky\, Columbia Univer sity \; \;

    Title: \;Structural basis of tempe rature sensation by the TRP channel TRPV3 \; \;

    Ab stract:

    Transient receptor potential (TRP) channels sens e temperature in organisms ranging from yeast to human but the molecular me chanisms of thermosensation remain obscure. Here we present structures of t he TRP channel TRPV3 in temperature-dependent open\, closed and intermediat e states that support a two-step model of its activation in response to hea t. During the strongly temperature-dependent first step\, sensitization\, t he channel pore remains closed while the S1-S4 and pore domains become more closely associated. The occupancies of lipid-binding sites surrounding the se domains are reduced and S6 undergoes an \;a-to-p \;helical trans ition. During the weakly temperature-dependent second step\, channel openin g\, the tight association of the S1-S4 and pore domains results in the comp lete extrusion of the lipids from their binding sites and splaying of the S 6 helices. Together\, these rearrangements are stabilized by structural cha nges in the linker domain and the C-terminus. Our results inform TRP channe l temperature activation and highlight an important role in heat sensing by TRPV3 of its interactions with the surrounding membrane lipids. \;&nbs p\;

    Topic: Biophysics Seminar
    Time: Nov 16\, 2020 04:00 PM Eastern Time (US and Canada) \;  \;
    Join Zoom Me eting
    https://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4 aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcod e: 741889     \; \; LAST-MODIFIED:20200922T143010Z LOCATION:Online Seminar -- Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200421T160000 DTEND;TZID=America/New_York:20200421T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200421T160000 CREATED:20190530T191015Z DESCRIPTION:
    Mark Srednicki\, UCSB

    Hosted by Jay Sau LAST-MODIFIED:20200402T153723Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED: Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20161205T110000 DTEND;TZID=America/New_York:20161205T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20161205T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Cindy Regal\, JILA\n\nTitle: Improving broadband displ acement detection via quantum correlations in an interferometer\n\nAbstract : The pursuit of increasingly sensitive interferometric measurement of mech anical motion has a rich history. This pursuit has resulted in the develop ment and study of seminal ideas on quantum limits of measurement and how to improve measurements in the face of seeming limitations. In recent years\ , an interesting class of devices has been developed in which low-mass\, hi gh-frequency\, and mechanically isolated objects are coupled to optical cav ities. The large response of these mechanical objects to applied forces ma kes them an ideal platform to observe the effects of radiation forces. We can now cool mechanical membranes well into their quantum ground state and routinely observe the effect of a fluctuating radiation pressure force due to optical shot noise. Our recent measurements study a technique to improv e interferometric displacement detection known as variational readout. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20191108T171000Z DTEND:20191108T174000Z DTSTAMP:20260828T094430Z UID:7vrfo3ihsc6sfl6sndoth1epm6@google.com CREATED:20191101T113126Z DESCRIPTION:Title: Time-domain order-by-disorder transition in a Harper-Hof stadter system\n\nSpeaker: Qiyu Liang\n\n(pizza and drinks served 10 min. b efore talk)\n\nAbstract: The Harper-Hofstadter model describes particles in two-dimensional (2D) lattices subjected to a uniform magnetic field. Ultra cold atomic gases in optical lattices are an ideal platform to study this m odel\, thanks to their capability for realizing large and tunable magnetic fluxes per lattice plaquette. We experimentally assembled such a 2D lattice rolled into a long tube\, just 3-site around\, thereby realizing periodic boundary conditions. These three sites were constructed from a synthetic di mension built from the atoms’ internal degrees of freedom. We inserted an a dditional longitudinal flux through the long axis of the cylinder\, a proce ss which has no analogy in a planar geometry. We observe a time-domain orde r-by-disorder transition: When the transverse flux is a simple rational num ber (2/3 in our experiments)\, the system’s unitary evolution is exquisitel y sensitive to the longitudinal flux and becomes incoherent when all values of the longitudinal flux are sampled. Remarkably\, away from simple ration al fractions\, the temporal order is restored. We explain that this transit ion can be understood equivalently in terms of a spatial self-averaging eff ect or interference between different matter-wave momentum states.\n\n\n-- LAST-MODIFIED:20191101T113126Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200930T200000Z DTEND:20200930T213000Z DTSTAMP:20260828T094430Z UID:0hiq9r6co68ecvrnc1tu677qq6@google.com CREATED:20200925T193359Z DESCRIPTION:Title : "Evidence for Higgs Boson Decay to a Pair of Muons from the CMS Experiment"
    Speaker Name: Nan Lu
    Speaker Institution : Calte ch

    Zoom information:

    https://umd.zoom.us/j/9194390 6688?pwd=b2FEK2wwTldPNGNWRURQS2R5UW5Mdz09

    Meeting ID: 919 4390 6688

    Passcode: 214353

    Abstract : This seminar presen ts the search for the rare Higgs boson decay to a pair of muons performed b y the CMS experiment at the LHC\, based on the full Run 2 dataset. Events a re categorized based on the characteristics of major Higgs boson production mechanisms and are analyzed using machine learning techniques\, which sign ificantly boosts the sensitivity of the search. A 3.0σ excess is observed i n data\, constituting the first evidence for the Higgs boson coupling to mu ons. \; \;


    Contact Name: Sarah Megonigal
    Contact E-Ma il: \;smegonig@umd.edu \;&nbs p\; LAST-MODIFIED:20200925T193359Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190826T150000 DTEND;TZID=America/New_York:20190826T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20191211T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20191125T150000 EXDATE;TZID=America/New_York:20191202T150000 EXDATE;TZID=America/New_York:20191028T150000 EXDATE;TZID=America/New_York:20190930T150000 EXDATE;TZID=America/New_York:20191007T150000 EXDATE;TZID=America/New_York:20191014T150000 EXDATE;TZID=America/New_York:20191021T150000 EXDATE;TZID=America/New_York:20191111T150000 DTSTAMP:20260828T094430Z UID:2l9tc5asm03r3ii7rlt0v7tpjo@google.com CREATED:20191114T160034Z DESCRIPTION:Speaker: David Curtin\, University of Toronto\n\nTitle: Mirror Stars: A New Probe of Dark Complexity\n\nAbstract: Mirror Stars can arise i n any dark sector that makes up some fraction of dark matter and comes with its own version of electromagnetism and nuclear physics. In particular\, t hey are a prediction of Twin Higgs theories\, which solve the little hierar chy problem without colored top partners\, giving rise to unique collider a nd cosmological signatures. We analyzed the signatures of Mirror Stars for the first time\, and find they can give rise to spectacular optical and X-r ay signatures that probe stellar and nuclear physics in the mirror sector. I will briefly review the Twin Higgs framework that concretely predicts Mir ror Stars and explain how to use the Twin Higgs as a well-motivated signatu re generator to explore unexpected signatures of Dark Complexity in general . I then show how Mirror Stars could be discovered in optical and X-ray sur veys\, and give a preview of ongoing investigations of Mirror Star signatur es in microlensing\, gravitational wave and other astrophysical experiments . LAST-MODIFIED:20191114T160034Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201009T160000Z DTEND:20201009T164500Z DTSTAMP:20260828T094430Z UID:7a6mr4aacbuadb4llec1uk6hdp@google.com CREATED:20200922T145339Z DESCRIPTION:Title: The multi-terminal Josephson effect
    Speaker: Natalia Pankratova< /span>
    Time : 12 - 12:45pm\ , Friday\, Oct. 9

    Seminar will be held via Zoom: \;https://umd.zoom.us/j/97099328991& nbsp\;and Meeting ID : 970 9932 8991

    Junctions o f more than two superconducting terminals are required for implementing bra iding operations on Majorana fermions. Moreover\, such multi-terminal Josep hson Junctions (JJ) were predicted to support topological state and host ze ro-energy quasiparticles. Unlike conventional two-terminal JJs where the va lue of critical current is a number\, the multi-terminal JJs exhibit a nove l feature – the critical current contour (CCC). We report the measurement o f non-trivial CCC shapes as a function of gate voltage and magnetic field i n hybrid semiconductor/superconductor (InAs/Al) multi-terminal JJs. Multi-t erminal junctions can host two different regimes: a strong neighbor-couplin g regime and a multi-terminal regime\, depending on the gate voltage. The g eometry of a junction is also an important factor defining the operating re gime. The effect of a perpendicular magnetic field indicates an observation of the Fraunhofer interference pattern in multi-terminal JJs.

     LAST-MODIFIED:20201006T170418Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI/QuICS/CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201202T183000Z DTEND:20201202T193000Z DTSTAMP:20260828T094430Z UID:7hposer5ab5bln7q2io352cdnn@google.com CREATED:20200915T182044Z DESCRIPTION:**UMD/ JHU Joint Seminar**

    Speaker:  \;Ron Walsworth\, UMD

    Will be \;preceded \;by zo om lunch at 12:30

    Title:

    Quantum Tools to Explore the Universe

    Abstract:
    I will describe two high-risk approaches to tw o hard problems. High-resolution imaging of crystal defects may allow direc tional detection of WIMP dark matter below the neutrino floor. Milky Way ac celerometry\, using either precision radial velocity measurements of stars or millisecond pulsar timing\, may enable a more direct\, dynamical determi nation of the local dark matter density. If successful\, the latter may inf orm the prospects for the former. \; \;
    For zoom link please ema il mknouse@umd.edu LAST-MODIFIED:20201028T151708Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMD/ JHU Seminar *Special Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181115T150000Z DTEND:20181115T160000Z DTSTAMP:20260828T094430Z UID:5i5ce47tjhh1ns411nfqa05kb3@google.com CREATED:20181107T125756Z DESCRIPTION:Title: A quantum optics perspective on analog black holes and a nalog Hawking radiation\n\nSpeaker: Iacopo Carusotto\, University of Trento \n\nAbstract: I will start by briefly reviewing the state of the art in the \n\ntheoretical and experimental study of analog models of quantum field\n\ ntheories in flat\, curved\, or time-dependent backgrounds using condensed\ n\nmatter and optical systems. I will then present a quantum optical theory \n\nof Hawking emission of phonons from analog black holes in quantum fluid s\n\nof ultracold atoms and in quantum fluids of light in nonlinear optical \n\ndevices. I will then move to the recent extension of the analog model\n \nparadigm to include new features\, in particular analogs of two-level\n\n emitters coupled to the quantum field. I will conclude with an outline\n\no f more speculative investigations about the back-reaction effects of\n\nqua ntum fluctuations on the underlying space-time and their possible\n\nstudy via quantum optical techniques.\n\nHost- Mohammad Hafezi LAST-MODIFIED:20181107T125756Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190206T160000Z DTEND:20190206T171500Z DTSTAMP:20260828T094430Z UID:0tlcg071o97ch3h9foh42gq27h@google.com CREATED:20190201T152309Z DESCRIPTION:Compactifying one direction of the cubic code results in a fami ly of two dimensional topological orders\, equivalent to stacks of toric co de enriched by translation symmetry. Surprisingly\, some of these models ha ve unbroken rigid 1D subsystem symmetries that lead to spurious contributio ns to the topological entanglement entropy. These spurious contributions ca n appear in a bulk computation of the topological entanglement entropy from a linear combination of subregion entropies with cancelling boundary terms . We introduce an entropic quantity that measures the presence of such spur ious contributions. LAST-MODIFIED:20190201T152309Z LOCATION:PSC 3150: QuICS Seminar-Dominic Williamson SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC 3150: QuICS Seminar-Dominic Williamson (Yale) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190326T160000 DTEND;TZID=America/New_York:20190326T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190212T160000 CREATED:20180727T143919Z DESCRIPTION:\nSpeaker: Jeffrey Bub\, UMD\n\nTitle: Totally Random: Why Nobo dy Understands Quantum Mechanics\n\nAbstract: This is a talk about a graphi c novel — a comic — I wrote with my daughter about quantum mechanics\, and why someone like Richard Feynman\, who won the Nobel prize in 1965 for his contribution to quantum electrodynamics\, could say that ‘nobody understan ds quantum mechanics.’ Totally Random\, published last year by Princeton Un iversity Press\, focuses on entanglement: what it is\, why it’s puzzling\, and what you can do with it. Schrödinger\, who came up with the term\, call ed entanglement 'the characteristic trait of quantum mechanics\, the one th at enforces its entire departure from classical lines of thought.' I’ll tal k about some of the difficulties writing a science comic\, particularly one aimed at explaining entanglement to a general audience\, how we deal with entanglement and some foundational questions about quantum mechanics\, and how a comic can explain some of the core ideas behind quantum computation a nd quantum cryptography. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181022T200000Z DTEND:20181022T210000Z DTSTAMP:20260828T094430Z UID:5qf56qejbnkrbobmirrk69d7m1@google.com CREATED:20181003T145013Z DESCRIPTION:\nTitle: Exploiting active site water and thermodynamics to imp rove the discovery and design of new pharmaceutical compounds\n\n\nSpeaker: Thomas Kurtzman\, Lehman College - City University of New York\n\nNotes: h ttp://www.marylandbiophysics.umd.edu/seminars/\n\nAbstract: Understanding t he underlying physics of the binding of small-molecule drugs to protein act ive sites is a key objective of computational chemistry and biology. The di splacement and reorganization of water molecules from the active site upon the binding of a ligand is a principal\, and often dominant\, source of bin ding free energy. We will discuss how statistical mechanics and molecular d ynamics simulations help characterize the solvation of protein active sites and how this information may be incorporated into computational tools aime d at aiding early stage drug discovery and design efforts. LAST-MODIFIED:20181003T145857Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191001T200000Z DTEND:20191001T210000Z DTSTAMP:20260828T094430Z UID:7vb3ctg2glpb8ocpndknakfm2t@google.com CREATED:20190703T140100Z DESCRIPTION:Speaker: Dr. Shamit Kachru\, Stanford University\n\nTitle: Adv entures in Quantum Critical Metals\n\nAbstract: Nature has provided us wit h several intriguing systems where\, apparently\,\n\nLandau’s Fermi liquid theory breaks down — with striking consequences for low energy physics.\nIn this talk I describe\, in an elementary way\, (highly idealized) attempts to model these \nquantum critical systems using the techniques of quantum field theory. LAST-MODIFIED:20190923T145831Z LOCATION:Physical Science Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201130T200000Z DTEND:20201130T210000Z DTSTAMP:20260828T094430Z UID:2g4uma4s7j80f3rpm61p0h1qaf@google.com CREATED:20201022T124509Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Zhengkang Z hang\, Caltech

    Title: Effective Field Theory of Dark Matter Direct D etection With Collective Excitations

    Abstract: I will present a fram ework for computing dark matter direct detection rates via phonon and magno n excitations in crystal targets for general dark matter models. It consist s of parameterizing dark matter interactions by a nonrelativistic EFT\, and computing material responses to the EFT operators. Our work extends previo us calculations that focused on simple models such as standard spin-indepen dent interactions\, and shows that new direct detection experiments that ut ilize collective excitations\, such as SPICE\, will have discovery potentia l over a broad range of dark matter theories.

    For zoom link please c ontact mknouse@umd.edu LAST-MODIFIED:20201125T200005Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181128T193000Z DTEND:20181128T210000Z DTSTAMP:20260828T094430Z UID:1ink773q0hhh2cd5tbgnlcsbgt@google.com CREATED:20181106T162623Z DESCRIPTION:

    Title: Hairy binary black holes in Einstein-Maxwell-dilaton theory
    < br>Speaker: Mohammed Khalil\, University of Maryland

    Abstract: In Ge neral Relativity and many modified theories of gravity\, isolated black hol es (BHs) cannot source massless scalar fields. Einstein-Maxwell-dilaton (EM d) theory is an exception: through couplings both to electromagnetism and ( non-minimally) to gravity\, a massless scalar field can be generated by an electrically charged BH. In this talk\, I will discuss how to analytically model the dynamics of binaries comprised of such scalar-charged (``hairy'') BHs. I will begin by considering the scalar charge in the test-body limit of a binary BH in EMd theory\, and how to use the post-Newtonian approximat ion to study the dynamics of binaries with arbitrary mass ratios. I will al so explain how to estimate deviations from GR by computing the Fourier-doma in gravitational waveform\, and the number of useful cycles measurable by A dvanced LIGO. Finally\, I will discuss the effective-one-body (EOB) framewo rk and construct two EOB Hamiltonians for binary BHs in EMd theory: one tha t reproduces the exact test-body limit and another whose construction more closely resembles similar models in General Relativity\, and thus could be more easily integrated into existing data-analysis infrastructure. LAST-MODIFIED:20181127T140226Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190508T180000Z DTEND:20190508T193000Z DTSTAMP:20260828T094430Z UID:177le0b5tl584ks9i3a1nq0njh@google.com CREATED:20190506T145536Z DESCRIPTION:Yukari Yamauchi\, UMD\n\nTitle: Weakly-bound nuclei as a probe of the statistical hadronization model\n\nAbstract: \nThe statistical hadro nization model is a simple and efficient phenomenological framework in whic h the relative yields for very high energy heavy ion collisions are essenti ally determined by a single model parameter---the chemical freeze-out tempe rature. Recent measurements of yields of hadrons and light nuclei coveri ng over 9 orders of magnitudes from the ALICE collaboration at the LHC wer e described by the model with remarkable accuracy with a chemical freeze-ou t temperature of 156.5 $\\pm$ 1.5 MeV. A key physical question is wheth er the freeze-out temperature can be understood\, literally\, as the temper ature at which the various species of an equilibrated gas of hadrons (incl uding resonances) and nuclei chemically freeze out as the model assumes\, or whether it successfully parametrizes the yield data for a different reas on. The yields of weakly-bound light nuclei---the deuteron and the hypert riton---provide insights into this issue. The analysis indicates that a key assumption underlying the model---that hadrons (and nuclei)\, just prior t o chemical freeze-out temperature\, are in thermal equilibrium and are suff iciently dilute as to have particle distributions accurately described stat istically by a nearly ideal gas of hadrons and nuclei with masses given by their free space values---appears to be inconsistent with the chemical free ze-out temperature output by the model\, at least for these weakly-bound nu clei. LAST-MODIFIED:20190506T145536Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200917T140000 DTEND;TZID=America/New_York:20200917T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201129T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20201119T140000 EXDATE;TZID=America/New_York:20201126T140000 EXDATE;TZID=America/New_York:20201112T140000 EXDATE;TZID=America/New_York:20201105T140000 EXDATE;TZID=America/New_York:20201029T140000 EXDATE;TZID=America/New_York:20201022T140000 EXDATE;TZID=America/New_York:20201001T140000 EXDATE;TZID=America/New_York:20200924T140000 EXDATE;TZID=America/New_York:20200917T140000 EXDATE;TZID=America/New_York:20201015T140000 DTSTAMP:20260828T094430Z UID:3c1p2fa08e8h2btjhis0aa1q4e@google.com CREATED:20200908T181833Z DESCRIPTION:Speaker:  Kamran Behnia\, National Center for Scientific Resear ch (CNRS)\nAbstract: TBA\nHost: TBA\n\nFor the zoom link please email Krist in Stenson at QMC@umd.edu LAST-MODIFIED:20200908T181833Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Kamran Behnia\, National Center for Scientific Rese arch (CNRS) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191118T213000Z DTEND:20191118T223000Z DTSTAMP:20260828T094430Z UID:2p9n0qo28l2ieqt010nvm3ldpo@google.com CREATED:20191009T235039Z DESCRIPTION:Title: Neutrinos from Nuclear Reactors\n\nSpeaker: Pieter Mumm\ , NIST Center for Neutron Research\n\nAbstract: Nuclear reactors are one of the most intense\, pure\, and controllable sources of neutrinos available. As a result\, reactor neutrinos have been an important tool for both disco very and refined measurement in our evolving understanding of fundamental p hysics. Over the last several decades\, reactors were central to the discov ery of neutrinos and played a significant role in our understanding neutrin o oscillation. We are now entering an era of precision measurement. At the same time reactor experiments have brought to light puzzling discrepancies between theoretical expectations and measurement. These hint at problems wi th the nuclear physics of reactor models or perhaps even additional physics beyond the Standard Model of particle physics. This seminar will tell this story.\n\nNotes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20191009T235039Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201130T110000 DTEND;TZID=America/New_York:20201130T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201130T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; \;Predictin g Linear-\, Nonlinear-\, and Hydrodynamics in Quantum Materials
    < br>Speaker: Prineha Narang\, Harvard University

    Abstract: \; The physics of quantum matter is rich with spectacular excited-state and noneq uilibrium effects\, but many of these phenomena remain poorly understood an d\, consequently\, technologically unexplored. My group’s research\, theref ore\, focuses on how quantum systems behave\, particularly away from equili brium\, and how we can harness these effects. By creating predictive theore tical and computational approaches to study dynamics\, decoherence and corr elations in matter\, our work will enable technologies that are inherently more powerful than their classical counterparts ranging from scalable quant um information processing to ultra-high efficiency optoelectronic and energ y conversion systems. In this talk\, I will present work from my research g roup on describing\, from first principles\, the microscopic dynamics\, dec oherence and optically-excited collective phenomena in quantum matter at fi nite temperature to quantitatively link predictions with 3D atomic-scale im aging\, quantum spectroscopy\, and macroscopic behavior. Capturing these dy namics poses unique theoretical and computational challenges. The simultane ous contribution of processes that occur on many time and length-scales hav e remained elusive for state-of-the-art calculations and model Hamiltonian approaches alike\, necessitating the development of new methods in computat ional physics. I will show selected examples of our approach in ab initio d esign of active defects in quantum materials. Building on this\, in the sec ond part of my seminar\, I will show our predictions of linear and nonlinea r dynamics and transport in Weyl semimetals. I will discuss the anomalous l andscape for electron hydrodynamics in systems beyond graphene\, highlighti ng that previously-thought exotic fluid phenomena can exist in both two-dim ensional and anisotropic three-dimensional materials. Our work identifies p honon-mediated electron-electron interactions as critical in a microscopic understanding of hydrodynamics. Non-diffusive electron flow\, and in partic ular electron hydrodynamics\, has far-reaching implications in quantum mate rials science\, as I will show. Finally\, I will discuss our very recent wo rk in driving quantum materials far out-of-equilibrium to control the coupl ed degrees-of-freedom\, and present an outlook on controlling newly-synthes ized topological systems.

    We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\ , we will also be live streaming each seminar on YouTube. Once a seminar st arts\, you will find a link to the live stream on our YouTube page at \ ;https://www.youtube.com/ user/JQInews \;(link \;is external) LAST-MODIFIED:20201129T193830Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190408T110000 DTEND;TZID=America/New_York:20190408T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190408T110000 CREATED:20190122T184735Z DESCRIPTION:Title: Collective excitations as quantum sensors for fundamenta l physics\n\nSpeaker: Ivette Fuentes\, Roger Penrose Institute\n\nAbstract: Quantum sensors that are used to measure gravitational fields and detect d ark energy typically use single particle interferometric techniques that ar e limited by the time of flight in the interferometer arm. In this talk I will present a new detection method that uses quantum resonances and the se nsitivity of collective excitations (phonons) to gravitational fields. When phonons in a Bose-Einstein condensate are initially prepared in a squeezed state\, spacetime distortions can create additional excitations through pa rametric amplification. This effect can be used to detect gravitational wav es at high frequencies. We have also developed a phonon based scheme to est imate spacetime parameters\, miniaturize devices to measure gravitational f ields and gradients and set further constrains on dark energy models. LAST-MODIFIED:20190402T131815Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190419T170000Z DTEND:20190419T180000Z DTSTAMP:20260828T094430Z UID:2k0k9a7et3o11fq9asb9i0rl65@google.com CREATED:20190124T142811Z DESCRIPTION:Speaker: Assistant Professor\, Judy J. Cha\, Yale University\, Mechanical Engineering &\; Materials Science \;

    Title: Phase Transformations of Nanoscale Systems using in situ TEM

    Abstract: Many nanoscale systems rely on phase transformations for switchi ng their functionalities in response to stimuli. Thus\, investigation of su ch phase transformations and subsequent correlation to changes in materials properties are critical. Cha uses in situ transmission electron microscopy (TEM) as a tool to study directly how phase transformations occur\, deviat e\, and be controlled at the nanoscale under either thermal or electrical s timuli.

    Dr. Cha will discuss two phase transformation examples: IBM ’s confined phase change memory (PCM) devices with a metal surfactant layer \, which showed a record endurance of 2x1012 programming cycles and metalli c glass nanostructures that are used to test the limits of classical nuclea tion theories at the nanoscale. In both cases\, atomic scale in situ TEM in vestigations reveal detailed and unexpected phenomena\, which can guide us to build better models and theories. If time allows\, she will briefly cove r superconducting behaviors of topological superconductor nanowires (indium -doped tin telluride nanowires) and the importance of sample quality in dic tating exotic quantum phases. LAST-MODIFIED:20190402T141016Z LOCATION:2110 Chem and Biomolecular Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190416T180000Z DTEND:20190416T191500Z DTSTAMP:20260828T094430Z UID:3559d57hba4otffi93tgl0blru@google.com CREATED:20190130T020159Z DESCRIPTION:Title: Constraints\, anyons\, and finding (thermal) equilibr ium

    Speaker: Fiona Burnell (Minnesota)

    Abstract: The ques tion of when\, and how quickly\, closed quantum systems reach thermal equil ibrium has been the subject of considerable interest in recent years. Most of this effort has focused on systems with conventional excitations\, such as Fermi gases and spin chains\, for which it is known that generic closed quantum systems do thermalize under their own dynamics\, though exceptions can occur\, for example in the presence of sufficiently strong disorder. This talk will focus instead on systems with less conventional excitations\ , which arise naturally in the context of topologically ordered and strongl y interacting systems. I will argue that generically\, at finite temperatu re such systems do thermalize under their own dynamics. I will also discus s the impact of disorder\, and when this can prevent thermalization. Final ly\, I will touch on how these strongly interacting systems approach equili brium\, and under what circumstances the strong interactions can lead to sl ower relaxation processes. \; \;

    Host: Tom Iadecola

    C ondensed Matter Theory Center website:
    http://www.physics.umd.edu/cmtc/semi nars.html LAST-MODIFIED:20190408T113134Z LOCATION:CMTC Conference Room (2205 Toll Physics Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201117T181500Z DTEND:20201117T191500Z DTSTAMP:20260828T094430Z UID:2pcpdrrtrq108hu7hc0ea4m5l8@google.com CREATED:20200923T161039Z LAST-MODIFIED:20200923T162520Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190329T170000Z DTEND:20190329T180000Z DTSTAMP:20260828T094430Z UID:1l1eq6f6g5ont3ieaaeosmhsgr@google.com CREATED:20190124T142346Z DESCRIPTION:Speaker: James F. Wishart\, Chemistry Division\, Brookhaven Nat ional Laboratory\n\nTitle: Radiation Chemistry\, Reactivity and Dynamics in Lonic Liquids\n\nAbstract: Being comprised entirely of charged species\, i onic liquids (ILs) have dramatically different properties compared to conve ntional molecular liquids and they provide new and unusual environments to test our understanding of physical chemistry phenomena. We are interested i n how IL properties influence physical and dynamical processes that determi ne the stability and lifetimes of reactive intermediates and thereby affect the courses of reactions and product distributions\, for example in the ar eas of primary and applied radiation chemistry\, radical chemistry and char ge transfer reactions.\n\nThe fundamental radiation chemistry of ILs is our primary focus. They have important potential applications in the recycling of used nuclear fuel to reduce legacy hazards\, and as battery electrolyte s\, lubricants and ion thruster fuel in spacecraft. In both cases\, stabili ty towards radiation exposure (radiolysis) is essential. A key issue in IL radiolysis is the competition between the solvation of the initially-formed excess electrons and the scavenging of electrons in different states of so lvation. Pre-solvated electron scavenging is especially significant in ILs because their relatively high viscosities make their solvation dynamics 100 -1000x slower than in conventional solvents. Pre-solvated electrons are mor e mobile and show different reactivity patterns than solvated ones. The slo wer relaxation dynamics of ILs make them excellent media for the general st udy of fundamental radiolysis processes\, in combination with BNL’s Laser-E lectron Accelerator Facility (LEAF) for picosecond pulse radiolysis studies . With LEAF we can observe the solvation processes of radiolytically-genera ted excess electrons and compare and contrast them with the mechanisms of p re-solvated electron scavenging. Recently-developed IR vibrational spectros copy transient absorption pulse radiolysis capabilities allow us to structu rally identify reactive transient species and follow their reactivity. LAST-MODIFIED:20190205T162412Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191129T180000Z DTEND:20191129T190000Z DTSTAMP:20260828T094430Z UID:631s06ds37k5kictsfg1c62frt@google.com CREATED:20190905T134459Z LAST-MODIFIED:20190905T134538Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering - NO SEMINAR - THANKSGIVING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201106T190000Z DTEND:20201106T194500Z DTSTAMP:20260828T094430Z UID:71atvfcerc06k4mdomv6nm9c82@google.com CREATED:20201104T151809Z DESCRIPTION:
    To help deepen our strategic relationship with NASA\, UMD w ill be hosting Dr. Dennis Andrucyk\, Director of NASA’s Goddard Space Fligh t Center\, for a webinar on "NASA Goddard: Current and Future Priorities" o n \;Nov. 6\, 2020 2:00-2:45 PM. \;

    This event is open to the UMD community\, so please share widely with your faculty\, students and staff. \; \;

    Please register here: \;https://umd.zoom .us/webinar/register/WN_xReh68IgQEGdFZfiueX8lQ. A confirmatio n email will contain information about joining the webinar.

    -------- --
    Speaker Bio

    Dennis Andrucyk
    Directo r\, NASA Goddard Space Flight Center
     \;
    Dennis Andrucyk is t he center director of NASA’s Goddard Space Flight Center\, as of January 20 20. He previously served as the deputy associate administrator for NASA’s S cience Mission Directorate. Prior to joining the Science Mission Directorat e\, Andrucyk served as NASA’s acting chief technologist.

    During his time as deputy associate administrator\, innovative observing systems were flown\, made possible by new research and technology. For example\, while o riginally used as educational tools\, distributed CubeSat constellations ha ve flown as a single mission and made simultaneous multi-point Earth measur ements\, expanding the knowledge of our home planet in a low cost manner. O ther CubeSats have flown to Mars to relay entry\, descent and landing infor mation of the InSight Mars lander\, helping us to explore our neighboring p lanet.

    Andrucyk has also championed efforts to develop a more divers e and inclusive workforce that encourages collaboration and partnership acr oss NASA science. LAST-MODIFIED:20201104T151809Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Webinar NASA Goddard: Current and Future Priorities TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190503T160000Z DTEND:20190503T164000Z DTSTAMP:20260828T094430Z UID:5lr59u479iqn712ej3i2iksb8s@google.com CREATED:20190426T153749Z DESCRIPTION:Title: Quantum interference between photons generated by remote ly located trapped ion and Rydberg ensemble systems\n\nSpeaker: Alexander C raddock\, JQI\n\nAbstract: Future efforts to build quantum networks are lik ely to rely on the ability to interface and entangle disparate quantum syst ems. Two systems of interest in the realm of quantum information are trappe d ions and Rydberg atoms. These systems operate at vastly different wavelen gths so direct photonic interaction has been a challenge\, however\, establ ishing a photonic link would open the door to hybrid protocols leveraging t he advantages of each system. Here\, we demonstrate near perfect Hong-Ou-Ma ndel (HOM) interference between photons generated by a barium ion and a rub idium Rydberg ensemble\, located in separate buildings and connected via an optical fibre. Our work serves as a building block for future hybrid ion-R ydberg quantum networks.\n\nNotes: Lunch served at 12:00 pm\, talk at 12:10 pm. Note the room location is different. LAST-MODIFIED:20190426T165025Z LOCATION:ATL 3330 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200323T200000Z DTEND:20200323T210000Z DTSTAMP:20260828T094430Z UID:5usa7k3liqh3skf7s8n5528oi5@google.com CREATED:20200319T131759Z DESCRIPTION:**This seminar will be conducted remotely via Zoom**\n\nDa Liu\ , UC Davis\n\nTitle: Composite Higgs Models at the LHC and beyond\n\n\nAbst ract: \nCompositeness is an elegant way to address the hierarchy problem. In this talk\, under broad assumption of partial compositeness and Higgs do ublet as the pseudo-Nambu-Goldstone bosons\, I will discuss about phenomeno logy of the spin-1 resonances and the top partners in CHMs and the relevanc e of their strong interactions in the searches at the LHC. I will also dis cuss about the strong multi-pole interaction as the target scenario for the precision measurement in the di-boson processes at the HL-LHC. Finally\, I will briefly discuss about the universal relationship between the Higgs co uplings predicted by the non-linearity and their phenomenological relevance in the future lepton colliders. LAST-MODIFIED:20200401T190032Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190130T160000Z DTEND:20190130T170000Z DTSTAMP:20260828T094430Z UID:21aghrr2q6j3ft50kvtsnmq9nd@google.com CREATED:20190128T151653Z DESCRIPTION:Speaker: Professor Hariharan Srikanth\, Professor of Physics\, University of South Florida\n\nTitle: Tuning Magnetic Anisotropy in Nanostr uctures for Biomedical and Electromagnetic Applications\n\nAbstract: Magnet ic nanoparticles have been building blocks in applications ranging from hig h density recording to spintronics and nanomedicine. Magnetic anisotropies in nanoparticles arising from surfaces\, shapes and interfaces in hybrid st ructures are important in determining the functional response in various ap plications. In this talk I will first introduce the basic aspects of anisot ropy and discuss resonant RF transverse susceptibility\, that we have used extensively\, as a powerful method to probe the effective anisotropy in mag netic materials. Tuning anisotropy has a direct impact on the performance o f functional magnetic nanoparticles in biomedical applications such as cont rast enhancement in MRI and magnetic hyperthermia cancer therapy. I will fo cus on the role of tuning surface and interfacial anisotropy with a goal to enhance specific absorption rate (SAR) or heating efficiency. Strategies g oing beyond simple spherical structures such as exchange coupled core-shell nanoparticles\, nanowire\, nanotube geometries can be exploited to increas e heating efficiency in magnetic hyperthermia. In addition to biomedical ap plications\, composites of anisotropic nanoparticles dispersed in polymers pave the way to a range of electrically and magnetically tunable materials for RF and microwave device applications. This lecture will combine insight s into fundamental physics of magnetic nanostructures along with recent res earch advances in their application in nanomedicine and electromagnetic dev ices. LAST-MODIFIED:20190128T151653Z LOCATION:1302 Chem/Nuc Eng. Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Division Seminar - MSE SPECIAL SE MINAR - IEEE Magnetics Society Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190903T171500Z DTEND:20190903T181500Z DTSTAMP:20260828T094430Z UID:5eifh2e5urgj2h64fi20vk3tm7@google.com CREATED:20190820T131358Z DESCRIPTION:Speaker: Professor Saar Rahav\, Technion\, Israel\n\nTitle: A R ealization of an Information Engine with Correlated Measurements\n\nAbstrac t: The connection between information and thermodynamics has been fascinati ng scientists ever since Maxwell envisioned his celebrated demon. Technolog ical progress now allows realizing in the lab this celebrated idea\, that w as originally conceived as a thought experiment. Indeed\, recent years have seen experimental realizations of several types of information engines. \n In this talk\, I will describe a realization of Maxwell's demon in which a colloidal particle is "directed" against a fluid flow. Beyond its appealing simplicity\, our experimental setup also exhibits an almost full conversio n of information to useful work\, since it allows to control how much work is applied directly on the particle. Another feature of the setup is a freq uent repeated measurement of the particle location\, resulting in nontrivia l correlations between the outcomes of consecutive measurements. The effect of these correlations on the amount of useful information that is acquired by measurements is studied with the help of computer simulations. \n\n[1] T. Admon\, S. Rahav\, and Y. Roichman\, "Experimental Realization of an Inf ormation Machine with Tunable Temporal Correlations"\, Phys. Rev. Lett.\,12 1\, 180601 (2018). LAST-MODIFIED:20190829T121545Z LOCATION:IPST 1116 Conference Room SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191015T171500Z DTEND:20191015T181500Z DTSTAMP:20260828T094430Z UID:66demek55ggg7jijsoqqbgdv3s@google.com CREATED:20190910T135625Z LAST-MODIFIED:20190910T135625Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191011T160000Z DTEND:20191011T170000Z DTSTAMP:20260828T094430Z UID:0kn1ulqpgtv4cu1d8d6vf3cp49@google.com CREATED:20191003T142333Z DESCRIPTION:\nTitle: "A quantum gas with Rashba spin-orbit coupling or how to make a donut with half a hole"\n\nSpeaker: Ana Valdés Curiel\n\nFriday 1 1 October\, 12:10-1240pm\n(pizza and drinks served 10 min. before talk)\n\n Abstract: Topological order can be found in a wide range of physical system s\, from crystalline solids\, photonic meta-materials and even atmospheric waves to optomechanic\, acoustic and atomic systems. Topological systems ar e a robust foundation for creating quantized channels for transporting elec trical current\, light\, and atmospheric disturbances. These topological ef fects are quantified in terms of integer-valued invariants\, such as the Ch ern number\, applicable to the quantum Hall effect\, or the Z2 invariant su itable for topological insulators. Here we engineered Rashba spin-orbit cou pling for a cold atomic gas giving non-trivial topology\, without the under lying crystalline structure that conventionally yields integer Chern number s. We validated our procedure by spectroscopically measuring the full dispe rsion relation\, that contained only a single Dirac point. We measured the quantum geometry underlying the dispersion relation and obtained the topolo gical index using matter-wave interferometry. In contrast to crystalline ma terials\, where topological indices take on integer values\, our continuum system reveals an unconventional half-integer Chern number\, potentially im plying new forms of topological transport. LAST-MODIFIED:20191003T142333Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200227T190000Z DTEND:20200227T200000Z DTSTAMP:20260828T094430Z UID:12odhhofmsqutbqgv524kjqks1@google.com CREATED:20200218T150020Z DESCRIPTION:Speaker: Rahul Sharma\nTitle: Momentum Resolved Superconducting Energy Gaps of Sr 2 RuO 4 using SI-STM\nAbstract:\nSr 2 RuO 4 has been a f ocus of research since past 25 years for the possibility of correlated topo logical\nsuperconductivity. The key to superconducting order parameter lies with the momentum space\nstructure of superconducting gap on each band i. Because the energy scales are so low\, it has never\nbeen possible to measu re the of Sr 2 RuO 4 . We have used millikelvin spectroscopic-imaging scann ing\ntunneling microscopy (SI-STM)\, a technique capable of measuring for m ultiband superconductors\nwith high precision to study superconducting stat e of Sr 2 RuO 4 . At T=90mK\, we visualize a set of\nBogoliubov scattering interference wavevectors consistent with gap nodes/minima\, that are all\nc losely aligned to the crystal-lattice directions on both the α- and β-bands . Taking these\nobservations in combination with other very recent advances in theory and experiments\, the BQPI\nsignature of Sr 2 RuO 4 appears most consistent with having symmetry.\nHost: J. Paglione\n\n\nRefreshments 1:30 pm John S Toll Physics Bldg Room 1117. Please bring a reusable coffee mug. LAST-MODIFIED:20200218T150020Z LOCATION:Room 1201 of the John S. Toll Building\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Rahul Sharma\, Cornell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200925T140000 DTEND;TZID=America/New_York:20200925T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20200925T140000 CREATED:20200827T172634Z DESCRIPTION:
    Seminar will be conducted via zoom: \;
    https://umd.zoom.us/j/96514239009?pwd=bkpqS1V5Nnl4Qi9ML2 1TYVVWWVdYUT09#success

    Speaker: Aleksi Kurkela\, CERN

    Tit le: Quark matter in the cores of neutron stars

    Abstract: Neutron sta rs are the densest astrophysical objects in the universe. Cores \;
    o f neutron stars reach densities as high as those realized in ultrarelativis tic \;
    heavy-ion collisions where ordinary nuclear matter melts into a new phase of \;
    matter\, quark matter. This naturally raises the question: does quark matter also exist \;
    inside neutron stars? In m y talk\, I describe how recent advancements in \;
    theory of superden se matter and in observations of neutron stars—such as the LIGO/Virgo \ ;
    detection of gravitational waves arising from a merger of two neutron stars—can inform \;
    us about what lies in the centers of neutron sta rs. I discuss how the different constraints
    point to the existence of qu ark matter cores in large neutron stars. \; LAST-MODIFIED:20200924T173501Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200221T180000Z DTEND:20200221T190000Z DTSTAMP:20260828T094430Z UID:0ic364ommcgqccd60khfr86iv7@google.com CREATED:20200122T134136Z DESCRIPTION:Speaker: Eric Isaacs\, Postdoctoral Fellow\, Materials Science &\; Engineering\, Northwestern University

    Title: Developing the N ext Generation of Quantum Materials Via First-Principles Theory and Data-Dr iven Design

    Abstract: Quantum materials\, which exhibit strong elect ron-electron interactions and novel topological states\, host the most exot ic phenomena in materials science and engineering such as high-temperature superconductivity and colossal magnetoresistance. They also hold significan t technological promise\, with applications such as rechargeable batteries\ , thermoelectricity\, and optoelectronics. Despite the increasing interest in such materials\, up to now\, the ability of theory and computation to ac celerate the discovery and understanding of quantum materials has been seve rely limited by (1) the failure of standard single-particle band theory app roaches to accurately describe their thermodynamics and electronic properti es and (2) our inability to efficiently search the vast space of all possib le materials.

    In this talk\, Dr. Isaacs will describe advances in first-p rinciples theory that are enabling the accurate description of quantum mate rials\, as well as new data-driven techniques aimed to rationally design an d discover materials with targeted properties. In the first part\, using ma ssively-parallelized supercomputer simulations\, he will demonstrate the po wer of approaches such as the many-body dynamical mean-field theory to desc ribe the electronic and thermodynamic properties of materials like lithium cobalt oxide\, the quintessential rechargeable battery cathode material. In the second part\, he will illustrate how materials with specialized electr onic band structures can be designed by exploiting the emerging area of mat erials informatics\, yielding materials with unprecedented thermoelectric e fficiency. Finally\, he will discuss future opportunities for data-driven d esign and understanding of quantum materials.

    LAST-MODIFIED:20200203T151305Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191210T181500Z DTEND:20191210T191500Z DTSTAMP:20260828T094430Z UID:7kuir8tbl62lfdgoboas5pc9sb@google.com CREATED:20191203T141506Z LAST-MODIFIED:20191203T141619Z LOCATION:1116 IPST Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190913T160000Z DTEND:20190913T170000Z DTSTAMP:20260828T094430Z UID:22nhkr61rnc6c7euingalm2tq7@google.com CREATED:20190905T184007Z DESCRIPTION:Title: Floquet engineering of optical lattices with spatial fea tures and periodicity below the diffraction limit\n\nSpeaker: Sarthak Subha nkar\n\nAbstract: Floquet engineering or coherent time periodic driving of quantum systems has been successfully used to synthesize Hamiltonians with novel properties. In ultracold atomic systems\, this has led to experimenta l realizations of artificial gauge fields\, topological band structures\, a nd observation of dynamical localization\, to name just a few. Here we pres ent a Floquet-based framework to stroboscopically engineer Hamiltonians wit h spatial features and periodicity below the diffraction limit of light use d to create them by time-averaging over various configurations of a 1D opti cal Kronig-Penney (KP) lattice. The KP potential is a lattice of narrow sub wavelength barriers spaced by half the optical wavelength (λ/2) and arises from the non-linear optical response of the atomic dark state. Stroboscopic control over the strength and position of this lattice requires time-depen dent adiabatic manipulation of the dark state spin composition. We investig ate adiabaticity requirements and shape our time-dependent light fields to respect the requirements. We apply this framework to show that a λ/4-spaced lattice can be synthesized using realistic experimental parameters as an e xample\, discuss mechanisms that limit lifetimes in these lattices\, explor e candidate systems and their limitations\, and treat adiabatic loading int o the ground band of these lattices. LAST-MODIFIED:20190919T154018Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200212T160000Z DTEND:20200212T170000Z DTSTAMP:20260828T094430Z UID:391599b3fu6vbqm4brje25olve@google.com CREATED:20200122T142608Z DESCRIPTION:Speaker: Shihui Zou Literature Seminar LAST-MODIFIED:20200203T152618Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190405T230000Z DTEND:20190406T003000Z DTSTAMP:20260828T094430Z UID:7i1h3f14uef7a3k3c844f5cev1@google.com CREATED:20190402T143638Z DESCRIPTION:SPACE: THE FINAL FRONTIER …FOR YOUR BODY. Join DR. Kate O’Neill to find out what happens to your body in space!\n\n\nFor more information \, please visit UMDPHYSICS.UMD.EDU/OUTREACH LAST-MODIFIED:20190402T143638Z LOCATION:1412 John S. Toll Physics Building\, 4150 Campus Dr\, College Park \, MD 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Your Body in Space TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201019T200000Z DTEND:20201019T210000Z DTSTAMP:20260828T094430Z UID:03u48ij06lhnrd4f3sduob2ai0@google.com CREATED:20200826T163502Z DESCRIPTION:Speaker: \;Myriam Cotten\, William &\; Mary \ ; \;

    Tilte: \; Host Defense Mechanisms at Biological Membranes: Investigating the Triangle between Metallopeptides\, Metal Ions\ , and Bioactive Lipids. \; \;

    Abstract: \;
    Hos t-produced antimicrobial peptides are multifunctional molecules that exert crucial roles to prevent and fight infections. Not only can they directly e radicate pathogens by permeabilizing their membranes or targeting intracell ular processes but they can also exhibit immunomodulatory activity\, such a s the chemotaxis of immune cells. The multiple functions of peptides in the piscidin family\, the first host defense peptides to be discovered in mast cells\, range from antibacterial\, to antiviral\, antifungal\, anticancer\ , anti-inflammatory\, and anesthetic activity. In our research\, we perform biochemical and biophysical experiments to investigate piscidin’s molecula r targets and mechanisms of antimicrobial action. Employing tools that incl ude high-resolution solid-state NMR\, neutron diffraction\, oriented circul ar dichroism\, permeabilization assays\, biological-activity testing\, and confocal microscopy\, we map at the molecular and atomic levels the landsca pe of intrinsic structural features and environmental conditions such as me tal ions and bioactive lipids that confer to a single peptide family a mult iplicity of functions in support of host defense. These principles could be useful to design novel therapeutics that treat immune-related diseases and eradicate drug resistant bacteria. \; \;

    Topic: Biophysics Seminar
    Tim e: Oct 19\, 2020 04:00 PM Eastern Time (US and Canada) \;  \;
    J oin Zoom Meeting
    https://umd.zoom.us/j/92682202606?pwd=< /u>Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889     \; LAST-MODIFIED:20200922T142658Z LOCATION:Online seminar -- Zoom meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201102T110000 DTEND;TZID=America/New_York:20201102T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201102T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Violations of Bell’s Inequality for Macroscopic S tates

    Speaker: Jim Franson\, University of Maryland Baltimore County

    Abstract: \; Einstein referred to the nonlocal collapse of the wave function as “spooky action at a
    distance”. John Bell later showed t hat the hidden-variable theories advocated by Einstein were
    inconsistent with the predictions of quantum mechanics. This distinction between quantu m and
    classical behavior is not limited to microscopic particles\, and B ell’s inequality can be violated by
    macroscopic systems as well. We rece ntly showed that a photon number state incident on a
    beam splitter will produce two output states whose phases are entangled [1]. We also showed
    that Bell’s inequality can be violated in this way regardless of how many photons are involved.
    Macroscopic superposition states of this kind are very susceptible to decoherence due to loss. I
    will describe how the dec oherence of these states during transmission over large distances can be
    made arbitrarily small by using noiseless attenuation [2] before transmiss ion\, followed by
    noiseless amplification [3] after transmission. As tim e permits\, I will also describe how the
    effects of dispersion can be mi nimized using nonlocal dispersion cancellation [4] for three or
    more pho tons\, which may be useful for quantum networks.
    1. S.U. Shringarpure an d J.D. Franson\, arXiv.1911.02468.
    2. R.A. Brewster\, T.C. Nodurft\, T.B . Pittman\, and J.D. Franson\, Phys. Rev. A 96\, 042309
    (2017).
    3. T. C. Ralph and A.P. Lund\, arXiv:0809.0326.
    4. J.D. Franson\, Phys. Rev. A 45\, 3126 (1992).

    We are hosting the Fall 2020 JQI Seminars virtual ly as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we wi ll also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/use r/JQInews \;(link \;is external) LAST-MODIFIED:20200929T021950Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190128T110000 DTEND;TZID=America/New_York:20190128T120000 RRULE:FREQ=WEEKLY;UNTIL=20190514T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20190218T110000 EXDATE;TZID=America/New_York:20190304T110000 EXDATE;TZID=America/New_York:20190318T110000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com CREATED:20190122T184735Z DESCRIPTION:Title: TBD\n\n\nSpeaker: TBD\n\nAbstract: TBD LAST-MODIFIED:20190122T184735Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200304T200000Z DTEND:20200304T210000Z DTSTAMP:20260828T094430Z UID:2g1rberkra84md6f4qie78ojou@google.com CREATED:20200226T183253Z DESCRIPTION:Title : Next generation silicon photonics
    Speaker Name: Prof \, Michal Lipson
    Speaker Institution : Columbia University\, Electrical Engineering Department

    Notes: ********************************* ****************************************************
    2020 NEW VISIT OR-POLICY: All colloquium attendees not possessing an LPS access badge shal l enter through the exterior side doors on the lower level. Take the exteri or stairs to the right of the LPS front doors down to the lower level\; the entry double doors will be immediately at the bottom of the stairs. If ele vator access is required\, use the phone to enter the lobby\, and someone w ill escort you to the elevator and down to the lower level. Upon entry and exit\, please sign in to and out of the logbook on the podium in the lower level entryway.
    Visitors to LPS wishing to access the upstairs lab space s must fill out and process a visitor request form and show a photo ID befo re admittance\, which is best done prior to arrival through an LPS employee . A visitor request form is NOT required if only attending the colloquium o n the lower level.
    Access to the LPS lobby for information is permitted by using the phone to the far left of the main entry doors.
    ************ ***************************************************************** ********
    For more information please contact Dave Bowen [dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz.
    Note: LPS is located at 8050 Greenmead Drive in College Park. There is par king at LPS and overflow parking at the adjacent LTS building but not at th e 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtya rd Apts. Please use the phone on the left hand side of the front door to ca ll the receptionist for entry.

    Abstract : We are now experiencing a revolution in optical technologies: in the past the state of the art in the field of photonics transitioned from individual miniaturized optical devic es to massive optical circuits on a microelectronic chip that can be modifi ed on demand. This revolution is ongoing –new materials and technologies ar e emerging to control the flow of light in unprecedented ways and it is ope ning the door to applications that only a decade ago were unimaginable.&nbs p\; \; LAST-MODIFIED:20200226T183253Z LOCATION:Laboratory For Physical Sci\, 8050 Greenmead Dr\, College Park\, M D 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquia/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190913T170000Z DTEND:20190913T180000Z DTSTAMP:20260828T094430Z UID:4tr1frp1496ch8p8floohsndfd@google.com CREATED:20190905T131901Z DESCRIPTION:Speaker: Mary Dorman\, UMD Assistant Director of Environmental Safety\n\nTitle: TBD\n\nAbstract: TBD LAST-MODIFIED:20190905T131901Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191211T200000Z DTEND:20191211T210000Z DTSTAMP:20260828T094430Z UID:3ab3tktpru8d3npjqgap1kldgf@google.com CREATED:20191205T141343Z DESCRIPTION:Title : Hysteresis Branch Crossing and the Stoner-Wohlfarth Mod el
    Speaker Name: Dr. Scott Mathews
    Speaker Institution : US Naval Res earch Laboratory
    Notes: Biography
    Scott A. Mathews is a physicist and materials scientist with more than 30 years of research experience in acad emia\, DoD labs\, and the private sector. Dr. Mathews has published more th an 30 scientific papers\, with over 2000 citations (Google Scholar). Dr. Ma thews is currently employed at the US Naval Research Laboratory as a Resear ch Physicist\, where he conducts research on magnetic materials\, magnetic sensors\, and laser materials processing.

    ************************** *********************
    Abstract:
    The Stoner-Wohlfarth model\, pub lished in 1948\, predicts the crossing of magnetic hysteresis branches in s ingle domain magnetic particles with uniaxial anisotropy. It has been widel y assumed that magnetic hysteresis branches cannot or do not cross. In fact \, a number of publications have referred to the crossing of hysteresis bra nches as being “energetically incorrect”\, “non-physical”\, and a “problem” with the Stoner-Wohlfarth model. This presentation reports the observation of magnetic hysteresis branch crossings in nickel films deposited on lithi um niobate substrates. The hysteresis branch crossing\, wherein the ascendi ng branch of the magnetization curve crosses over the descending branch (an d the descending branch crosses over the ascending branch)\, is demonstrate d experimentally and simulated using a modified Stoner-Wohlfarth model\, wh ich takes into account thermal fluctuations and a finite distribution of ma gnetic anisotropy. The crossing of magnetic hysteresis branches is shown to be a robust\, reproducible phenomenon.

    *NEW POLICY: All Visitors to LPS must present a photo ID for entry to the colloquium*


    Note: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H bu ilding. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts . Please use the phone on the left hand side of the front door to call the receptionist for entry.
    For more information please contact Dave Bowen [ dbowen1@lps.umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20191205T141343Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200312T153000 DTEND;TZID=America/New_York:20200312T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20200402T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20200319T153000 EXDATE;TZID=America/New_York:20200326T153000 DTSTAMP:20260828T094430Z UID:5eo89lqa196p5fr8ka3vjbavre@google.com CREATED:20200213T172330Z DESCRIPTION:For upcoming talks in this series: \; http://www-math.umd.edu/gcal_rss.php?semin ar_key=RGP&\;year=2020&\;html


    https://www-math.umd.edu/research/seminars/current-rits-a nd-student-seminars.html
    LAST-MODIFIED:20200331T153429Z LOCATION:MTH (Kirwan Hall) 1313\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190506T190000Z DTEND:20190506T203000Z DTSTAMP:20260828T094430Z UID:037kedjmhf8e8afsm7hfn7ir3g@google.com CREATED:20190129T144600Z DESCRIPTION:

    Jiji Fan\, Brown U \;

    Title: Cosmological probes of Higgs dynamics in the early Universe
    Abstract:

    While the Higgs mass is fixed today\, it is possibl e that the Higgs mass is dynamical and varied with time in the early Univer se. In particular\, there is an intriguing possibility that if the Higgs fi eld couples to some oscillating scalar (e.g.\, a modulus) in the early Univ erse\, the Higgs oscillated between symmetry preserving and broken phases. I will discuss one possible cosmological probe of this type of phase oscill ation. If the Higgs couples to the inflaton\, the phase oscillations could imprint on the primordial spectrum\, resulting in novel “k-wavepacket" feat ures. I will explain the origin of the wavepacket feature and briefly discu ss a potential observable through measuring fine structures in the CMB temp erature spectrum. LAST-MODIFIED:20190503T183221Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200928T200000Z DTEND:20200928T210000Z DTSTAMP:20260828T094430Z UID:5b3f08hqv8e0c9ko0p4qthmb9k@google.com CREATED:20200826T162642Z DESCRIPTION:Speaker: \;Robert Abel\, Schrödinger Inc.

    Title: \;Integrated deployment and collaborative use of adva nced computational modeling and next-generation machine learning to acceler ate drug discovery \; \;

    Abstract: \;
    Small mo lecule drug discovery requires identification of ligands manifesting highly potent and selective binding\, while maintaining a wide variety of other l igand properties required for safety and biological efficacy. \; We wil l present how integrated deployment and collaborative use of advanced compu tational modeling and next-generation machine learning can enable discovery teams to rapidly achieve these goals. \; We will further present multi ple case studies from active drug discovery projects highlighting how these technologies\, rather than simply being used to evaluate ligand design ide as\, can now be used to directly ideate \;novel ligand matter likely to advance discovery efforts. \; \; \; \;

    Topic: Biophysics Seminar
    Time : Sep 28\, 2020 04:00 PM Eastern Time (US and Canada) \;  \;
    Jo in Zoom Meeting
    https://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606< br>Passcode: 741889     LAST-MODIFIED:20200922T142715Z LOCATION:Online seminar -- Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191202T200000Z DTEND:20191202T213000Z DTSTAMP:20260828T094430Z UID:5sf3fcci766hhantpljv0nqdoc@google.com CREATED:20190723T150432Z DESCRIPTION:Nikita Blinov\, Fermilab

    Title: Imprints of the Early Un iverse on Axion Dark Matter Substructure

    Abstract: Ultra-violet comp letions of the Standard Model often feature a modified
    cosmology before Big Bang Nucleosynthesis. For example\, the energy content
    of the univer se prior to this epoch can be dominated by a non-relativistic particle that eventually decays and reheats the universe at temperatures of a few MeV. T his period of early matter domination (EMD) has important consequences for both the amount of dark matter (DM) that is left over\, and for the growth of density perturbations. I will discuss such a cosmology in the context of axion-like particle (ALP) dark matter\, whose non-thermal nature makes it especially sensitive to these early-universe dynamics. EMD leads to qualita tively different target parameter space for direct detection experiments. I will also show that ALP density perturbations grow much faster during EMD\ , leading to the formation of dense DM clumps\, or minihalos\, with charact eristic masses below the Earth mass. While extremely rare\, Earth encounter s with these clumps would lead to enhanced signals in direct detection expe riments. These small-scale structures can also be probed with pulsar timing and photometric monitoring of highly magnified extragalactic stars.

    slides LAST-MODIFIED:20200115T172100Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190402T160000 DTEND;TZID=America/New_York:20190402T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190402T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Tom Faulkner\, University of Illinois at Urbana-Champa ign\n\nTitle: Quantum Information\, Causality and Negative Energy\n\nAbstra ct: Negative energy density can arise naturally in Quantum Field Theory - t he theoretical framework with which we describe fundamental particle physic s and the matter which makes up our universe. However too much negative ene rgy density can lead to pathologies when coupling this matter to gravity vi a Einstein’s equations. In this talk I will discuss conjectured bounds on negative energy density that can rule out such pathologies and sketch very recent general proofs of these bounds. The methods we use combine causality considerations with concepts taken from the study of quantum information. I will discuss how this provides further evidence for deep connections betw een gravity and quantum information. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181008T190000Z DTEND:20181008T203000Z DTSTAMP:20260828T094430Z UID:3ste7brpfm8usdbn11egb8k17j@google.com CREATED:20181002T131355Z DESCRIPTION:Title: Probing the early Universe with gravitational waves from cosmic strings

    Speaker: Yanou Cui\, University of California\, Rive rside

    Abstract: Many motivated extensions of the Standard Model of p article physics predict the existence of cosmic strings. Gravitational wave s originating from the dynamics of the resulting cosmic string network have the ability to probe many otherwise inaccessible properties of the early u niverse. In this study we show how the spectrum of gravitational waves from a cosmic string network can be used to test the equation of state of the e arly universe prior to Big Bang Nucleosynthesis (BBN). We also demonstrate that current and planned gravitational wave detectors such as LIGO\, LISA\, DECIGO/BBO\, and ET/CE have the potential to detect signals of a non-stand ard pre-BBN equation of state and evolution of the early universe (e.g.\, e arly non-standard matter domination or kination domination) or new degrees of freedom active in the early universe beyond the sensitivity of terrestri al collider experiments and cosmic microwave background measurements. LAST-MODIFIED:20181002T131402Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181203T200000Z DTEND:20181203T213000Z DTSTAMP:20260828T094430Z UID:6n9vc7m2hvj4l367sv7r7p8oea@google.com CREATED:20181106T162510Z DESCRIPTION:
    Title: Dark Matter in Disequilibrium and Implications for D irect Detection

    Speaker: Lina Necib\, Cal Tech

    Abstract: Usin g two realizations of the Milky Way from the FIRE simulation\, we find that the kinematics of dark matter follows closely the kinematics of accreted s tars from the same mergers. We use this correspondence to build an empirica l local velocity distribution of dark matter\, by analyzing the Gaia second data release coupled with the ninth release from the Sloan Digital Sky Sur vey\, and computing the velocity distribution of the accreted stars. We fin d that this velocity distribution is peaked at lower velocities than the ge nerally assumed Maxwell Boltzmann distribution\, due to the presence of a r ecent merger referred to as the Gaia Sausage\, leading to a weakening of di rect detection limits at dark matter masses less than 10 GeV. \;
    LAST-MODIFIED:20181107T192831Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200302T170000Z DTEND:20200302T180000Z DTSTAMP:20260828T094430Z UID:5vs17g9215nbt0tfgh8hho294v@google.com CREATED:20200218T185513Z DESCRIPTION:Journey From the Beginning of the Universe: How Did We Get T here?


    Lecture and book signing by John Mather\, NASA Goddard Space Flight Center

    Refreshments at 11:30 am\; book signing after the talk.

    http://e ssic.umd.edu/joom2/index.php/component/jevents/eventdetail/2632/42%7C48%7C5 3/journey-from-the-beginning-of-the-universe-how-did-we-get-there?Itemid=62 LAST-MODIFIED:20200218T185513Z LOCATION:ESSIC Conference Room 4102\, 5825 University Research Ct\, College Park SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ESSIC Seminar: John Mather TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190326T171500Z DTEND:20190326T181500Z DTSTAMP:20260828T094430Z UID:49n9uh8ac9ikhs7ugj6eu9ctd7@google.com CREATED:20190205T162611Z DESCRIPTION:Speaker: Dr. Grant Rotskoff\, New York University\, Courant Ins titute\n\nTitle: Neural Networks as Interacting Particle Systems: Understan ding Global Convergence of Parameter Optimization Dynamics\n\nAbstract: The performance of neural networks on high-dimensional data distributions sugg ests that it may be possible to parameterize a representation of a target h igh-dimensional function with controllably small errors\, potentially outpe rforming standard interpolation methods. We demonstrate\, both theoreticall y and numerically\, that this is indeed the case. We map the parameters of a neural network to a system of particles relaxing with an interaction pote ntial determined by the loss function. This mapping gives rise to a determi nistic partial differential equation that governs the parameter evolution u nder gradient descent dynamics. We also show that in the limit that the num ber of parameters n is large\, the landscape of the mean-squared error beco mes convex and the representation error in the function scales link n^{-1}. In this limit\, we prove a dynamical variant of the universal approximatio n theorem showing that the optimal representation can be attained by stocha stic gradient descent\, the algorithm ubiquitously used for parameter optim ization in machine learning. This conceptual framework can be leveraged to develop algorithms that accelerate optimization using non-local transport. I will conclude by showing that using neuron birth/death processes in param eter optimization guarantees global convergence and provides a substantial acceleration in practice. LAST-MODIFIED:20190312T122759Z LOCATION:IPST 1116 Conference Room (Bldg. #085) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200210T210000Z DTEND:20200210T223000Z DTSTAMP:20260828T094430Z UID:2v780em2h5dcqd68u9qfu9phl6@google.com CREATED:20200110T151944Z DESCRIPTION:Zhen Liu\, UMD\n\n\nTitle: Hunting New Physics through Portals\ n\n\nAbstract: Hunting New \nNew physics beyond the standard model is highl y anticipated\, especially by dark matter and the recently discovered Higgs boson considerations. With the successful exploration and new knowledge fr om various particle physics experiments\, weakly-coupled new physics throug h various portals bear great potential for discovery but also poses signifi cant challenges. In this talk\, I will present my recent studies on how to search for a heavy axion\, motivated by the strong CP problem and quality p roblem. The widely open unexplored parameter space can be probed via a nove l search on displaced light jets at the LHC. I further discuss new physics opportunities through this new class of signatures with our proposed search es on the portal particles to hidden sector physics. LAST-MODIFIED:20200207T150150Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200224T110000 DTEND;TZID=America/New_York:20200224T120000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com RECURRENCE-ID;TZID=America/New_York:20200224T110000 CREATED:20191125T175528Z DESCRIPTION:Title: \;Non-reciprocal and robust photonics with opto-m echanical systems

    Speaker: Gaurav Bahl\, Illinois

    Abstr act: \;

    Time-reversal symmetry is a defining property for wave phe nomena in linear stationary media. However\, broken time-reversal symmetry is required for producing essential nonreciprocal devices like isolators\, circulators\, and gyrators. Magneto-optic methods can enable nonreciprocal behavior for electromagnetic waves\, but this approach does not readily tra nslate to the microscale or for atomic-PNT technologies\, compelling us to search for nonmagnetic solutions. This talk will describe our work to explo it light-sound interactions for producing strongly nonreciprocal behavior i n chip-scale systems. The optomechanical physics within these devices enabl e fundamental experiments having analogies to quantum condensed matter phen omena\, including phonon laser action\, cooling\, and electromagnetically i nduced transparency [1\,2]. We demonstrate how mechanics is uniquely positi oned to solve long standing challenges for photonic integrated circuits tha t are required for cold-atom microsystems and related quantum technologies [3]. Moreover\, the underlying nonreciprocal behavior enables robust photon ic devices that are immune to backscattering induced by material defects an d disorder [4\,5]. Time permitting\, I will introduce our work on how a syn thetic Hall effect can be leveraged to produce strongly nonreciprocal metam aterials [6]\, and some of our research efforts on robust topological pumpi ng [7] and high-order topological insulators [8].


    References

    < ol>

  • G. Bahl et al\, Nature Physics 8(3)\, pp. 203-207\, 2012.

  • J. Kim et al\, Nature Physics 11\, pp. 275-280\, 2015.

  • D. Sohn et al\, Nature Photonics 12\, 91-95\, 2018.

  • S. Ki m et al\, Nature Communications 8\, 205\, 2017.

  • S. Kim et al \, Optica 6(8)\, pp.1016-1022\, 2019.

  • C.W. Peterson et al\, Science Advances 4(6)\, eaat0232\, 2018.

  • I. Grinberg et al\, Nature Communications (preprint on arXiv \;: 1905.02778)\, 2020.

  • C.W. Peterson et al\, Nature 555\, pp.346–350\, 2018.



    • Host: Mohammad Hafezi

     \;

    LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200309T110000 DTEND;TZID=America/New_York:20200309T120000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com RECURRENCE-ID;TZID=America/New_York:20200309T110000 CREATED:20191125T175528Z DESCRIPTION:Title: Topolectric circuits - the drosophila for synthetic topo logical matter\n\nSpeaker: Ronny Thomale \n\nAbstract: Pioneered by topolo gical insulators and semimetals\, topological states of matter have shaped a significant part of contemporary condensed matter physics\, and have larg ely branched out into adjacent fields such as photonics\, mechanics\, and o ther metamaterial setups. Recently\, the frontier has shifted to topologica l systems which embody enrichments such as non-Hermiticity and non-linearit y. In analogy to the paradigmatic example of the drosophila as the biologic al system most amenable to studies of genetic functionality\, we want to es tablish electric circuit networks as the canonical platform for the study o f intricate topological states of matter. Our work involves circuit network realizations of gain and loss\, non-reciprocity\, and synthetic dimensions . The outstanding accessibility and scalability of electric circuit metamat erials provides a new laboratory for topological matter.\n\nHost: Jay Sau LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181015T173000Z DTEND:20181015T183000Z DTSTAMP:20260828T094430Z UID:2k9kt5brk0unpg4a2q45chf0ng@google.com CREATED:20181011T115555Z DESCRIPTION:Title: Engineering Majorana zero modes\n\nSpeaker: Andrey Antip ov\, Microsoft\n\nAbstract: The initial theoretical proposal for the realiz ation of Majorana bounds states in a condensed matter setup requires three simple ingredients: superconductivity\, spin-orbit coupling and magnetic fi eld. While this proposal is simple\, the experiments are not\, as they invo lve material science\, fabrication steps\, cooling\, electrostatic control and actual measurements. The results of experiments are not unambiguous and allow for multiple interpretation by simple theoretical models. In order t o bridge the gap one has to include peculiarities of experimental setup and engineer the modelling of systems supporting Majorana zero modes. In this talk I will show how the next generation of numerical models captures the e ffects of electric fields\, disorder\, orbital effects and how it can feedb ack and guide the ongoing experimental effort in the field.\n\nHost: Mike S checter LAST-MODIFIED:20181011T144032Z LOCATION:2205 John S Toll Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190508T200000Z DTEND:20190508T213000Z DTSTAMP:20260828T094430Z UID:1iq7gre0jvpqp9ef7t0iulaaa2@google.com CREATED:20190503T145347Z DESCRIPTION:Title : "First Oscillation Results Combining Neutrino and Antin eutrino Data from the NOvA Experiment"\n\nSpeaker: Michael Baird\, Universi ty of Virginia \n\nAbstract : The NOvA experiment is a long-baseline neutri no oscillation experiment that uses the upgraded NuMI beam from Fermilab to detect both electron and muon flavored neutrinos in a Near Detector\, loca ted at Fermilab\, and a Far Detector\, located at Ash River\, Minnesota. NO vA's primary physics goals include precision measurements of neutrino oscil lation parameters\, such as theta23 and the atmospheric mass-squared splitt ing\, along with probes of the mass hierarchy and the CP violating phase. T his talk will present the first NOvA results using a combined neutrino and anti-neutrino data set\, based on a neutrino beam exposure of 8.85E20 proto ns-on-target and an anti-neutrino beam exposure of 6.9E20 protons-on-target . LAST-MODIFIED:20190503T145357Z LOCATION:PSC room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190709T150000Z DTEND:20190709T153000Z DTSTAMP:20260828T094430Z UID:01v2i3to4qc14n0q1buet2c1od@google.com CREATED:20190627T175524Z DESCRIPTION:\nTitle: The charge-radius puzzle\n\nSpeaker: Marcin Kalinowski \, University of Warsaw and University of Maryland\n\nAbstract: The nuclear charge radius is one of the electromagnetic moments of the nucleus and\, a s such\, is independent of the system the nucleus is in. The observed discr epancy between muonic and electronic system\, in both hydrogen and deuteriu m\, might indicate unknown interactions that cannot be explained by straigh tforward modifications of the standard model. In this talk\, we will briefl y explain methods of high-precision atomic spectroscopy and present results of our recent work. Calculation and inclusion of the surprisingly large co ntribution\, that was previously omitted\, effectively resolves the discrep ancy in the deuterium and has important implications in the context of the proton radius puzzle. LAST-MODIFIED:20190627T185714Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190403T180000Z DTEND:20190403T193000Z DTSTAMP:20260828T094430Z UID:3vgqrq5asln2ti16qbr4trjjnh@google.com CREATED:20190129T151403Z DESCRIPTION:Ingo Tews\, LANL\n\nTitle: Neutron-stars as probes for nuclear physics\n\nAbstract: \nNeutron stars are astrophysical objects of extremes. They contain the largest reservoirs of degenerate fermions\, reaching the highest densities we can observe in the cosmos\, and probe matter under con ditions that cannot be recreated in terrestrial experiments. \nIn August 20 17\, the first neutron-star merger has been observed\, which provided compe lling evidence that these events are an important site for the production o f all elements heavier than iron in the universe. Furthermore\, the gravita tional-wave signal of such events might shed light upon the nature of stron gly interacting matter in the core of neutron stars. \n\nTo understand thes e remarkable events\, reliable nuclear physics input is essential. In this talk\, I will explain how to use Chiral effective field theory and advanced Quantum Monte Carlo many-body methods to provide a consistent and systemat ic approach to strongly interacting systems from nuclei to neutron stars an d allow precision studies with controlled theoretical uncertainties. I wil l present recent results for light nuclei and nucleonic matter relevant for the nuclear astrophysics of core-collapse supernovae\, neutron stars\, and neutron-star mergers\, and will discuss future directions and opportunitie s. LAST-MODIFIED:20190326T192629Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201027T171500Z DTEND:20201027T181500Z DTSTAMP:20260828T094430Z UID:4u9gam6u2r9k44q537j3bsu0gg@google.com CREATED:20200923T160520Z DESCRIPTION:Speaker: \;Tom Goldstein\, Associate Professor\, CMNS - Com puter Science\, UMD


    Title: \;A Scientific Approach to Optimi zation and Generalization in Deep Neural Networks

    Abstract: \;Th e goal of this talk is to explore how neural networks work from an empirica l perspective\, using visualizations and experiments. \; Deep neural ne tworks\, when properly designed\, can be trained using standard optimizatio n tools. \; Furthermore\, trained networks generalize to data that was not used for training. \; I'll discuss why both of these behaviors are quite surprising\, and present possible ways to resolve these mysteries tha t are based on experimental evidence.

    ZOOM LINK: \;https://umd.zoom.us/j/95477011025 LAST-MODIFIED:20201020T144921Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170327T110000 DTEND;TZID=America/New_York:20170327T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170327T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Chris Greene\, Purdue University\nTitle: Recent break throughs with Efimov and Rydberg physics\nAbstract: Experimental capabilit ies with ultracold few-body systems \ncontinue to advance rapidly in a numb er of contexts. This talk will highlight\ntwo recent developments. First\ , the observation of butterfly Rydberg \nmolecules with kilodebye dipole mo ments (H. Ott's group) opens the door to the \npossibility of observing int eresting blockaded phases in one dimension.\nSecond\, experimental observat ions of heavy-heavy-light Efimov physics\nin a mixture of Cs and Li atoms ( M. Weidemueller's and C. Chin's groups) \nhave sparked in-depth theoretical studies that suggest intriguing new regimes \nwhere interference minima co mpete and intertwine with resonances in recombination. LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191205T123000 DTEND;TZID=America/New_York:20191205T133000 DTSTAMP:20260828T094430Z UID:7v6qro7tiht0n64brbbcf8p3ov@google.com RECURRENCE-ID;TZID=America/New_York:20191205T123000 CREATED:20190828T134015Z DESCRIPTION:Title: Scaling and universality in bistable optical cavities\nS peaker: Said Rodriguez\nAMOLF | Interacting Photons (Group Leader)\n\nAbstr act: Driven nonlinear dynamical systems can reside in two steady states at a single driving condition. This feature\, known as bistability\, is associ ated with emergent phenomena in phase transitions\, scaling\, and universal behavior. In descriptions of bistable systems\, it is typically assumed th at the nonlinear force responsible for bistability acts instantaneously on the system. In addition\, the role of quantum fluctuations on bistability w as until recently largely assumed to be irrelevant to experiments. In this talk\, I will present two experiments where these two assumptions were chal lenged. Both of these experiments were based on nonlinear optical cavities driven by light\, but similar physics is expected in other systems. The e xperiments we performed consisted of scanning a driving parameter (e.g. las er intensity or frequency) across an optical bistability at various speeds\ , and analyzing the resultant dynamic optical hysteresis. Intriguingly\, bo th quantum fluctuations and non-instantaneous interactions lead to a univer sal power law decay of the hysteresis area as a function of the scanning sp eed. However\, whereas quantum fluctuations lead to universal scaling behav ior in the limit of slow scans\, non-instantaneous interactions lead to a universal scaling behavior in the limit of fast scans. I will conclude with perspectives for realizing lattices of bistable optical cavities\, and the opportunities that these open for performing analog computation and for st udying stochastic nonlinear dynamics with light. LAST-MODIFIED:20191104T130745Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191023T150000Z DTEND:20191023T160000Z DTSTAMP:20260828T094430Z UID:693o4co3jat42cc0e80sl877uo@google.com CREATED:20190903T170310Z DESCRIPTION:Speaker: Sapna Sarupria\, Clemson\n\nTitle: Building and Applyi ng in Silico Nanoscopes for Gas Hydrates and Ice\n\nAbstract: Nucleation – that is the onset of a new phase from a metastable phase – is a difficult p henomenon to study both experimentally and computationally. Nucleation rele vant spatial and temporal resolution is difficult to access in experiments. In contrast\, while computer simulations are perfectly suited to probe the se length and timescales\, sampling statistically relevant number of nuclea tion events is computationally expensive. In our research\, we use advanced sampling techniques in conjunction with molecular dynamics simulations to sample hundreds and thousands of nucleation events. We apply these methods to study heterogeneous ice nucleation and gas hydrate nucleation.\nGas hydr ates are crystalline (ice-like) solids formed by water forming cages around guest molecules such as methane\, carbon dioxide and tetrahydrofuran. Thes e form at low temperatures and high pressure conditions and are a flow assu rance problem in the oil and gas industry. In addition\, hydrates can be po tential energy source\, and be used for gas separation and water desalinati on. The fundamental question that remains unanswered is -- how does the sol ution of guest and water transform into this crystalline solid. Our simulat ions provide insights into the mechanisms of hydrate nucleation and highlig ht its dependence on the water solubility of the guest molecules. These fin dings will facilitate design of promoters and inhibitors of gas hydrates. I will also present results on our studies of heterogeneous hydrate nucleati on. Heterogeneous ice nucleation relates to freezing of water driven by the presence of an impurity such as a mineral surface. Interestingly\, it is n ot yet understood what about a surface promotes or inhibits the formation o f ice. We use simulations of salt (silver iodide) and mineral (kaolinite) s urfaces \nto provide insights into the properties of a surface that facilit ate ice formation. These findings can help design surfaces that either inhi bit ice nucleation (for example in cases such as wind mills\, power lines\, and transportation) or that promote ice nucleation (for example in cases s uch as food preservation and cryopreservation). Collectively\, my talk prov ides an overview of the intricate behavior of water molecules in transformi ng from liquid to the solid phase\, and the simulation methods developed to reveal these behaviors. LAST-MODIFIED:20191016T131510Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181203T210000Z DTEND:20181203T220000Z DTSTAMP:20260828T094430Z UID:65hif5ker89qa55l3i9nrkcbi4@google.com CREATED:20181029T150023Z DESCRIPTION:Title: The nucleosome: from structure to function through physi cs \n\nSpeaker: Alexey Onufriev\, Virginia Tech\n\nNotes: http://www.maryla ndbiophysics.umd.edu/seminars/\n\nAbstract: The nucleosome\, a complex of 1 47 base-pairs of DNA with eight histone proteins\, must protect its DNA\, b ut\, at the same time\, allow on-demand access to it when needed by the cel l. The exact mechanism of the control remain unclear.\n\nA simplified elect rostatic model of the nucleosome reveals that at physiological conditions t he complex is close to the phase boundary separating it from the “unwrapped " states where the DNA is more accessible. A small drop in the positive cha rge (e.g. through acetylation of a lysine) of the globular histone core can significantly lower the DNA affinity to the core\, and thus increase DNA a ccessibility. The findings suggest that charge-altering post-translational modifications in the histone core might be utilized by the cell to modulate accessibility to its DNA at the nucleosome level. A connection to higher order states of chromatin is made. \n\nA follow-up\, detailed multi-state a tomistic model of the nucleosome explores virtually all possible charge-alt ering post-translational modifications (PTMs) in the globular histone core. The model reveals a rich and nuanced picture: the effect of PTMs varies g reatly depending on location\, including counter-intuitive trends such as d ecrease of DNA accessibility for some lysine acetylations in the core. A de tailed connection to transcription regulation in-vivo is made. LAST-MODIFIED:20181126T142318Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181109T170000Z DTEND:20181109T174500Z DTSTAMP:20260828T094430Z UID:7ejaoduhh3mvj37k404infukpp@google.com CREATED:20181030T140815Z DESCRIPTION:Title: Optical Lattice with Torus Topology\n\nSpeaker: Hwanmun Kim\, JQI\n\nAbstract: We propose an experimental scheme to construct an op tical lattice where the atoms are confined to the surface of a torus. This construction can be realized with spatially shaped laser beams which could be realized with recently developed high resolution imaging techniques. We numerically study the feasibility of this proposal by calculating the tunne ling strengths for atoms in the torus lattice. To illustrate the non-trivia l role of topology in atomic dynamics on the torus\, we study the quantized superfluid currents and fractional quantum Hall (FQH) states on such a str ucture. For FQH states\, we numerically investigate the robustness of the t opological degeneracy and propose an experimental way to detect such a dege neracy. Our scheme for torus construction can be generalized to surfaces wi th higher genus for exploration of richer topological physics.\n\nIn collab oration with Guanyu Zhu\, J. V. Porto\, Mohammad Hafezi\nhttps://journals.a ps.org/prl/abstract/10.1103/PhysRevLett.121.133002\n\nNotes: Lunch served a t 12:00 pm\, talk at 12:15 pm. LAST-MODIFIED:20181031T211516Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190301T180000Z DTEND:20190301T190000Z DTSTAMP:20260828T094430Z UID:7h0g1ppe80cirb0vq4r8f7kon0@google.com CREATED:20190124T141611Z DESCRIPTION:Speaker: Professor Shenqiang Ren\, Mechanical &\; Aerospace Engineering\, University of Buffalo

    Title: Material Chemistry Meets Engineering Towards Strongly Correlated Materials

    Abstract: M olecular charge transfer crystals provide an efficient route for the coupli ng control of optical\, magnetic\, mechanical\, and electrical subsystems\, which aims at converting one form of energy into another. A surge of inter est in the coupling effect has stemmed from its potential use as a new vers atile route for energy transduction. A challenging task in this area is to design molecular materials and assemble them into desired structural forms\ , so that their unique physico-chemical properties can be harvested for ene rgy transduction capabilities. In this talk\, I will discuss my group’s rec ent research on the materials-by-design\, self-assembly and nanomanufacturi ng of emerging molecular crystals. Specifically\, I will focus on molecular strongly correlated materials. LAST-MODIFIED:20190205T161644Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200213T183000Z DTEND:20200213T193000Z DTSTAMP:20260828T094430Z UID:0sc5kp22302a61u7j1cfbtb1gn@google.com CREATED:20200129T184617Z DESCRIPTION:
    Adish Vartak\, CERN Fellow


    Search for Dark Matter and Rare Decays of the Higgs Boson with the CMS Detector LAST-MODIFIED:20200210T162224Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191015T173000Z DTEND:20191015T190000Z DTSTAMP:20260828T094430Z UID:1fvimpeen397a37jd1r973nsuu@google.com CREATED:20191010T194400Z DESCRIPTION:Speaker: Yoshitaka Hatta\, Brookhaven National Laboratory\n\nTi tle: The mass and spin structure of the proton\n\nAbstract: The origin of t he mass and spin of the nucleon\, namely\, how they can be understood in te rms of quarks' and gluons' degrees of freedom\, has been designated as one of the primary goals of the US Electron-Ion Collider (EIC). I will give a r eview of the mass and spin decompositions and discuss their QCD evolution a nd possible experimental signatures. LAST-MODIFIED:20191010T194400Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200916T161500Z DTEND:20200916T171500Z DTSTAMP:20260828T094430Z UID:5eam69ogi0q3p4u0rhcopqugt4@google.com CREATED:20200910T164517Z DESCRIPTION:Speaker: Frank Noe\, Free University Berlin - \;http://www.mi.fu-ber lin/de/en/math/groups/comp-mol-bio/

    Title: \;Deep Learning f or the Molecular Sciences

    Abstract: Artificial intelligence (AI)\, a nd specifically deep machine learning (ML) methods have a profound impact o n industry and information technology. But since recently AI methods are al so changing the way we do science. In this talk I will present some of our recent efforts to build machine learning methods that attack fundamental pr oblems in physical and chemical sciences: the sampling problem in physical many-body systems\, and the solution of the quantum-chemical electronic Sch rödinger equation. Key in making progress in these hard problems with ML is to interrogate the physical system about what the learning problem should be\, and to encode physical structures\, such as symmetries and conservatio n laws\, into the ML model.


    ZOOM: \;https://umd .zoom.us/j/92665239576?pwd=b29LamhBK0JiUlByRFBjbTU2YXRoUT09 LAST-MODIFIED:20200914T145550Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210107T160000Z DTEND:20210107T170000Z DTSTAMP:20260828T094430Z UID:6u4oqelkm20hrm9e85ofvlq98f@google.com CREATED:20210104T160521Z DESCRIPTION:
    JQI special seminar: \;Solitons \;and breathers in Bose-Einstein condensates \;

    ZOOM: \;https://umd.zoom.us/j/98227879844 \; &nbs p\; \;

    Speaker: De (Henry) Luo\, Rice University

    Abstract :
    Solitons are localized wave packets that maintain their shape while pr opagating at a constant velocity. They form in nonlinear wave systems\, whe re an attractive nonlinearity balances the wave dispersion. When multiple s olitons collide\, each soliton emerges from the collision with no change in their shape and velocity\, but only gains a small shift in their trajector y. Such remarkable properties are a result of the integrability of the unde rlying equations\, which prompted widespread research interest in solitons and their interactions. They have been observed experimentally in water wav e\, fiber optics\, plasma\, and Bose-Einstein condensates (BEC). In this ta lk\, I will discuss three recent experiments on solitons in Bose-Einstein c ondensates. First\, we prepare a pair of solitons in a quasi-1D harmonic co nfinement and observe their collisions as they oscillate in the trap. We sh ow that the collision is a complex process depending on the relative phase of the solitons. The in-phase solitons may collapse due to the proximity to the 1D-3D crossover\, while the out-of-phase solitons persist. Second\, we can form a train of solitons from an elongated BEC by rapidly changing the sign of the nonlinear interaction. We study the effect of modulational ins tability on the formation of the soliton trains. Third\, we can form a quas i-bound state of multiple solitons\, known as breathers. We characterize th e breather dynamics and measure the effect of the aspect ratio of the harmo nic potential\, the strength of the quench and the strength of the nonlinea rity. The formation of breathers paves ways for studying beyond-mean-field physics in BECs. LAST-MODIFIED:20210104T160521Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI special seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190201T180000Z DTEND:20190201T190000Z DTSTAMP:20260828T094430Z UID:03qk53mlaa87398uh880am31he@google.com CREATED:20190124T140326Z DESCRIPTION:Speaker: Timothy Koeth\, MSE Research Professor and Radiation F acilities Director\, UMCP\n\nTitle: MSE Seminar: Charge Loaded Dielectrics\ n\nAbstract: An ideal pulsed power system provides stable long-term energy storage followed by the rapid and controlled delivery upon demand. I will be discussing my research group’s program which has developed a novel metho d of energy storage and control to meet these demands. The deep implantati on of electric charge in dielectrics rivals the energy storage density of s uper capacitors. Unburdened of conductive plates of classical capacitor co nstruction\, practical devices are able assume many geometries. Predictive modeling benchmarked by laboratory experimentation have verified the abilit y to tailor pulse waveforms and we have demonstrated the ability to dissipa te gigawatts of power. LAST-MODIFIED:20190131T143649Z LOCATION:2110 Chem/Nuc Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190917T160000 DTEND;TZID=America/New_York:20190917T170000 DTSTAMP:20260828T094430Z UID:5og0is3rohgeori9q923a4kmrk@google.com RECURRENCE-ID;TZID=America/New_York:20190917T160000 CREATED:20190801T151326Z LAST-MODIFIED:20190830T173601Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium. See Sept. 19 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201005T200000Z DTEND:20201005T213000Z DTSTAMP:20260828T094430Z UID:0434n6r8ijtm061kiutocnjmcd@google.com CREATED:20200909T165800Z DESCRIPTION:Speaker: Lei Chen \;\, UMD
    Title: \; \; \;Pe rfect Absorption in Complex Scattering Systems with or without Hidden Symme tries \; \;
    Abstract: \;
    Wavefront shaping (WFS) schemes for efficient energy deposition in weakly lossy targets is an ongoing chall enge for many classical wave technologies relevant to next-generation telec ommunications\, long-range wireless power transfer\, and electromagnetic wa rfare. In many circumstances these targets are embedded inside complicated enclosures which lack any type of (geometric or hidden) symmetry\, such as complex networks\, buildings\, or vessels\, where the hypersensitive nature of multiple interference paths challenges the viability of WFS protocols. We demonstrate the success of a new and general WFS scheme\, based on coher ent perfect absorption (CPA) electromagnetic protocols\, by utilizing a net work of coupled transmission lines with complex connectivity that enforces the absence of geometric symmetries. Our platform allows for control of the local losses inside the network and of the violation of time-reversal symm etry via a magnetic field\; thus establishing CPA beyond its initial concep t as the time-reversal of a laser cavity\, while offering an opportunity fo r better insight into CPA formation via the implementation of semiclassical tools \; \;
    Advisor: Anlage GroupAdvisor: Anlage Group

    < b>Zoom Link \; &\;&n bsp\; \;Log In Information

    https://umd.zoom.us/s/91198037643

    Meeting ID: 911 9803 7643 \;

    Password:558484 \;

    LAST-MODIFIED:20200911T170527Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Lei Chen\, UMD TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190430T171500Z DTEND:20190430T181500Z DTSTAMP:20260828T094430Z UID:5dm9k5nmcag7g12tnkkgk1mmdn@google.com CREATED:20190205T175525Z DESCRIPTION:Speaker: Professor Mark Robbins\, Johns Hopkins University\n\nT itle: The Origins of Friction: How Solids Lock Together and Critical Behavi or at the Onset of Sliding\n\nAbstract: While we take friction for granted \, it is surprisingly hard to get robust friction forces from atomic scale models. Indeed\, simple theoretical models suggest that the frictional stre ss between rigid\, clean surfaces should almost always vanish in the ther modynamic limit\, and this “superlubric” behavior has been observed in a ra nge of experiments. The talk will first describe how elasticity in the subs trate affects friction. The behavior in small contacts remains consistent w ith superlubricity and is very different for identical commensurate and inc ommensurate crystals and for amorphous solids. As the contact size grows to wards micrometer scales\, the frictional stress approaches a constant tha t is similar for all surface geometries even though it arises from differen t mechanisms. For crystalline surfaces  is related to the Peierls stress f or dislocation motion\, while for amorphous systems  arises from pinning b y disorder above a Larkin length. While these results show elasticity destr oys superlubricity and yields finite friction forces\,  is generally too s mall to explain experiments. The second part of the talk will describe how glassy disordered layers between the surfaces can lead to larger friction f orces. These glassy layers may be adsorbed molecules or the layer of granul ar matter along an earthquake fault. They can lead to complex rate-state ph enomena or critical behavior with a nontrivial power law relating stress an d velocity at the onset of motion. LAST-MODIFIED:20190424T190004Z LOCATION:IPST 1116 Conference Room (Bldg. #085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201006T171500Z DTEND:20201006T181500Z DTSTAMP:20260828T094430Z UID:454dmdf33vh3imlumg9rb9u4rd@google.com CREATED:20200923T160221Z LAST-MODIFIED:20200923T160222Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201103T160000Z DTEND:20201103T170000Z DTSTAMP:20260828T094430Z UID:75k2an7f5al08bedv9b03hvfdd@google.com CREATED:20201028T155954Z DESCRIPTION:Speaker: Prof. Yuxing Li \n\nTitle: Rational Vaccine and Antibo dy Design to Combat Viral Infections\n\nAbstract: TBA \n\nWhen: 11:00am\n\n Zoom: TBA LAST-MODIFIED:20201028T155954Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:"Rational Vaccine and Antibody Design to Combat Viral Infections" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191125T163000Z DTEND:20191125T170000Z DTSTAMP:20260828T094430Z UID:2tm9kp0l23r94pm7aac0149rse@google.com CREATED:20191111T140826Z DESCRIPTION:Title: A Large\, Ion-based Quantum Computer\n\nSpeaker: Marko C etina\n\nAbstract: In collaboration between universities and industrial par tners\, we have constructed an ion-based \nquantum computer with the goal o f realizing an error-corrected quantum bit.\nI will report on the performan ce of our integrated system\, including fidelities of\n\nsingle-qubit and t wo-qubit gates\, operation with many qubits\, crosstalk\, and error detecti on.\n\nThis work is supported by the ARO with funding from the IARPA LogiQ program\, the NSF Practical Fully-Connected Quantum Computer program\, the DOE program on Quantum Computing in Chemical and Material Sciences\, the AF OSR MURI on Quantum Measurement and Verification\, and the AFOSR MURI on In teractive Quantum Computation and Communication Protocols. LAST-MODIFIED:20191120T162452Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181205T203000Z DTEND:20181205T213000Z DTSTAMP:20260828T094430Z UID:03fkl2jsllf0eondvh0p2m1rfa@google.com CREATED:20181128T214412Z DESCRIPTION:Title: Transport of collisional impurities with flux-surface de nsity variation in stellarator plasmas\n\nSpeaker: Stefan Buller\, Chalmers University\n\nAbstract: Highly charged non-fuel ions can enter fusion plas mas through interactions at plasma-facing components. Due to their high cha rge\, such impurities radiate strongly\, leading to prohibitively large pow er losses if they are allowed to accumulate in the core of the fusion plasm a. Additionally\, their high charge makes these impurities susceptible to s light variations in the electrostatic potential that arise along the magnet ic field in fusion devices\, which cause them to develop density variation along the magnetic field lines. We here present an analytic calculation tha t shows how the transport of these heavy impurities are affected by such de nsity variations in stellarators\, and apply it to find optimal density var iations that reduce or prevent the accumulation of impurities. LAST-MODIFIED:20181128T214412Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201016T140000 DTEND;TZID=America/New_York:20201016T153000 DTSTAMP:20260828T094430Z UID:5im4v4jhpt9darn1vp145qffqj@google.com RECURRENCE-ID;TZID=America/New_York:20201016T140000 CREATED:20200827T172634Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96514239009?pwd=bkpqS1V5Nnl4Qi9ML21TYVVWWVdYUT09#success

    Speaker: Saori Pastore\, WUSTL

    Title: Electroweak Interactions in Nu clei

    Abstract: Nuclei are used for high-precision tests of the Stand ard Model and
    for searches of physics beyond the standard model. Without a thorough
    understanding of nuclei\, we will not be able to meaningfull y interpret the

    experimental data nor can we disentangle new physics signals from under-
    lying nuclear effects. Experimental programs addres sing open questions

    in nuclear physic\, fundamental symmetries and n eutrino physics often rely
    on accurate calculations of electroweak struc ture and reactions in nuclei.
    Quantum Monte Carlo methods are used to so lve the many-body nuclear
    problem and fully account for many-nucleon cor relations and currents.

    This microscopic approach yields a picture o f the nucleus and its interac-
    tions with external electroweak probes wh ere many-body effects in both

    nuclear interactions and currents are essential to accurately explain the
    data. In this talk\, I will report o n recent progress in Quantum Monte
    Carlo calculations of lepton-nucleus interactions in a wide range of energy
    and momentum transfer and their c onnections to current experimental efforts. LAST-MODIFIED:20201009T121434Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181010T183000Z DTEND:20181010T200000Z DTSTAMP:20260828T094430Z UID:4u7vhi9pc8n7jvfo23s64kvasb@google.com CREATED:20180926T153954Z DESCRIPTION:
    Title: Anisotropies in the Gravitational Wave Background fr om Cosmological Phase Transitions

    Speaker: Yuhsin Tsai\, University of Maryland

    Abstract: Phase transitions in the early universe can re adily create an observable stochastic gravitational wave background. I will argue that such a background necessarily contains anisotropies analogous t o those of the cosmic microwave background (CMB) of photons\, and that thes e too may be within reach of proposed gravitational wave detectors. Correla tions within the gravitational wave anisotropies and their cross-correlatio ns with the CMB can provide new insights into the mechanism underlying prim ordial fluctuations\, such as multi-field inflation\, as well as reveal the existence of non-standard ``hidden sectors" of particle physics in earlier eras.
    LAST-MODIFIED:20180926T153954Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200320T160000Z DTEND:20200320T164000Z DTSTAMP:20260828T094430Z UID:5rv9c3jf6q9rk4n47ksbnl0280@google.com CREATED:20200310T001555Z DESCRIPTION:Cancelled!
    Title: \;The multi-terminal Josephson effect& nbsp\;
    Speaker: \;Natalia Pankratova

    (pizza and drinks served at 1 2pm\; talk starts at 12:10pm) \;

    Abstract: \;Junctions of more t han two superconducting terminals are required for implementing braiding op erations on Majorana fermions. Moreover\, such multi-terminal Josephson Jun ctions (JJ) were predicted \;to support topological state and host zero -energy quasiparticles. \;Unlike conventional two-terminal JJs where th e value of critical current is a number\, the multi-terminal JJs exhibit a novel feature – the critical current contour (CCC). \;We report the mea surement of non-trivial CCC shapes as a function of gate voltage and magnet ic field \;in hybrid semiconductor/superconductor (InAs/Al) multi-termi nal JJs. Multi-terminal junctions can host two different regimes: a strong neighbor-coupling regime and a multi-terminal regime\, depending on the gat e voltage and junction geometry. The effect of a perpendicular magnetic fie ld indicates an observation of the Fraunhofer interference pattern in multi -terminal JJs. LAST-MODIFIED:20200311T133511Z LOCATION:ATL 2324\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cancelled: JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181115T123000 DTEND;TZID=America/New_York:20181115T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181115T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Transiently Chaotic behavior in Superconducting Metamate rials\nSpeaker: Amitava Banerjee\nUMD Department of Physics\n\nAbstract: In this seminar\, we attempt to connect two of the major research vistas in n onlinear dynamics\, namely\, chimera states and chaos. We consider a simpli fied mathematical model of a one-dimensional lattice of coupled superconduc ting quantum interference devices (SQUIDs) driven by an external magnetic f ield [1\,2]. We numerically simulate chimeras and other collective states i n the magnetic flux oscillations through the SQUIDs and show that they are born through chaotic dynamics on finite time scales. We demonstrate the sig natures of transient chaos in flux oscillations with fluctuating amplitudes \, exponential escape time distribution\, and fractal Wada basins of attrac tion for chimera states [1\,3]. This study complements the identification o f chimeras as transiently chaotic states themselves [4\,5]\, and may be use ful for prediction\, characterization and control of such states.\n\nRefere nces: 1. A. Banerjee and D. Sikder\, Phys. Rev. E 98\, 032220 (2018). 2. M. Trepanier\, D. Zhang\, O. Mukhanov\, V. P. Koshelets\, P. Jung\, S. Butz\, E. Ott\, T. M. Antonsen\, A. V. Ustinov\, and S. M. Anlage\, Phys. Rev. E 95\, 050201(R) (2017). 3. Y.-C. Lai and T. Tel\, Transient Chaos (Springer\ , New York\, 2011). 4. M. Wolfrum and O. E. Omelchenko\, Phys. Rev. E 84\, 015201(R) (2011). 5. M. Wolfrum\, O. E. Omelchenko\, S. Yanchuk\, and Y. L. Maistrenko\, Chaos 21\, 013112 (2011)." LAST-MODIFIED:20181031T165537Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191016T150000Z DTEND:20191016T160000Z DTSTAMP:20260828T094430Z UID:7ejlk00ctlc9gktfoq8e3i9j6i@google.com CREATED:20190903T170212Z DESCRIPTION:Speaker: Wyatt Vreeland\, NIST\n\nTitle: TBA LAST-MODIFIED:20190903T170213Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190129T160000 DTEND;TZID=America/New_York:20190129T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190129T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Ted Jacobson\, University of Maryland\n\nTitle: Hawkin g radiation in a laboratory!?\n\nAbstract: Einstein's theory of gravity ope ned Pandora's box of warped spacetime in 1915\, and out popped the black ho le\, confusing and delighting (or maddening) physicists ever since. In the early 1970's it was discovered that black holes have entropy and temperatur e\, and decay by Hawking radiation\, like radioactive whirlpools in the spa cetime river\, raising two persistent puzzles: the black hole information p aradox and the transPlanckian problem. To bring some of this down to earth\ , Unruh in 1980 conceived of a black hole analog\, formed by a flowing\, qu antum fluid\, which might one day be studied in a laboratory. That day has now come...probably. In the last few years\, Jeff Steinhauer has carried ou t a number of experiments on Bose-Einstein condensates of rubidium atoms\, configured to emulate a black hole\, and reported on the observation of the rmal phononic Hawking radiation and its quantum entanglement with phonons i nside the sonic black hole. In this colloquium I will describe these ideas and experiments\, as well as simulations that have been carried out in orde r to help understand what has so far been observed. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Canceled - Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20180927T180000Z DTEND:20180927T193000Z DTSTAMP:20260828T094430Z UID:482cemts4kmlrdr0ehh8o67hga@google.com CLASS:PUBLIC CREATED:20180914T201458Z DESCRIPTION:\nTitle: "New single crystal diffractometer with polarized neut rons POLI at MLZ as a versatile tool for the detailed investigation of magn etic structures"\nSpeaker: Vladimir Hutanu\, Institute of Crystallography\, RWTH Aachen University and Jülich Centre for\nNeutron Science (JCNS) at He inz Maier-Leibnitz Zentrum (MLZ)\n\nAbstract: \nPolarized neutron diffracti on (PND) is a powerful method to investigate magnetic structures. It gives unique access to contributions from nuclear and magnetic scattering\, their interference terms\, and magnetic chirality and permits to distinguish bet ween them. In contrast to the non-polarized neutron diffraction\, where the scattered intensity depends as square on the magnetic structure factor\, P ND has a linear nuclear-magnetic interference term as part of the scattered intensity. This increases the precision in the determination of the ordere d magnetic moment for at least one order of magnitude. Born in the late 50s of the last century and developed over decades by a small groups of devote d experts\, PND became nowadays a wide spread\, well established\, and reco gnized technique to answer difficult scientific questions about the detaile d magnetic ordering in topic materials\, often intractable with other metho ds. Recently newest member of such instrumentation family POLI (Polarizatio n Investigator) was built and commissioned at the neutron source “Heinz Mai er-Leibnitz” (MLZ) in Garching Germany. POLI is the first instrument routin ely using 3He spin filters both to produce and to analyze the neutron polar ization in combination with double focusing non-polarized monochromators. T his results in a relatively high flux of the polarized neutrons of the shor t wavelength and improved resolution in comparison with other similar instr uments. Three different experimental techniques are implemented (or under d evelopment) on POLI: a) Spherical neutron polarimetry (SNP)\, called also 3 D polarization analysis\, using the third generation polarimeter device Cry opad\, b) classical flipping ratio (FR) technique in applied magnetic field and c) non-polarized neutron diffraction under extreme conditions (high/lo w temperatures\, magnetic/electric fields\, pressure and their combination) . We will present recent examples of using these techniques on POLI for the detailed determination of the magnetic structures in multiferroics\, super conductors\, heavy fermion compound and other interesting magnetic material s.\n\nRefreshments Served at 1:30 pm John S Toll Physics Bldg Room 1117 LAST-MODIFIED:20180926T175914Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM COLLOQUIUM: Vladimir Hutanu\, Institute of Crystallography\, R WTH Aachen University and Jülich Centre for Neutron Science at Heinz Maier- Leibnitz Zentrum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181105T110000 DTEND;TZID=America/New_York:20181105T120000 DTSTAMP:20260828T094430Z UID:427cdmjabe5ftscfvdqtuq7p44_R20180924T150000@google.com RECURRENCE-ID;TZID=America/New_York:20181105T110000 CREATED:20180829T133041Z DESCRIPTION:Title: New non-equilibrium quantum states enabled by breakdown of thermalization\n\nSpeaker: Dmitry Abanin\, University of Geneva\n\nAbs tract:The experimental advances in synthetic quantum systems allow one to p robe quantum thermalization and its breakdown. Thermalization occurs in erg odic systems and “erases” quantum information contained in the initial many -body states. Therefore\, to create long-lived quantum states\, it is of pa rticular interest to find mechanisms of thermalization breakdown. One way o f suppressing thermalization is by introducing quenched disorder\, which ma y induce many-body localization (MBL) [1]. Surprisingly\, MBL systems may a lso avoid heating under periodic driving\, which opens up the possibility o f having stable\, Floquet-MBL phases with unusual properties. I will discus s one recent example of such a phase – a two-dimensional Anomalous Floquet Insulator\, characterized by fully localized bulk states and chiral\, therm alizing edge states [2]. I will discuss another example of a non-trivial Fl oquet phase – the critical time crystals\, which have recently been observe d in driven systems of interacting\, coherent NV-spins in black diamond. Fu rther\, I will argue that MBL may not be the only way to break ergodicity. I will propose another mechanism\, “quantum many-body scarring” [3]\, which bears a similarity to the well-known phenomenon of quantum scars in few-bo dy chaos\, and leads to a weaker form of ergodicity breaking in a many-body system of Rydberg atoms [4]. \n\n\n\n [1] For a review\, see D. A. Abanin\, E. Altman\, I. Bloch\, M. Serbyn\, arXiv:1804.11065 (2018).\n\n [2] F. Nathan\, D. A. Abanin\, E. Berg\, N. Lindner\, M. Rudner\ , arXiv:1712.02789 (2018).\n\n [3] C. Turner\, A. Michailidis \, D. A. Abanin\, M. Serbyn\, Z. Papic\, Nature Physics (2018) doi:10.1038/ s41567-018-0137-5.\n\n [4] H. Bernien\, Nature 551\, 579 (201 7). LAST-MODIFIED:20181015T115012Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191205T210000Z DTEND:20191205T223000Z DTSTAMP:20260828T094430Z UID:2v7t6rmpmvq85pdqkdd76qummr@google.com CREATED:20191029T193241Z DESCRIPTION:Alessandro Podo\, Scuola Normale Superiore

    Title:
    UV perspectives on Composite Dark Matter

    Abstract:
    Strongly interac ting dark sectors with accidentally stable particles can offer an attractiv e scenario for explaining the observed dark matter abundance. Moreover\, co mposite dark matter candidates can have
    peculiar properties and a rich c osmological history.
    I will consider theories with fermions in complex representations of the dark gauge group and charged under the Standard Mode l. I will discuss what are the difficulties with such theories and how to c onstruct a viable model in which all the infrared states acquire dynamicall y a non-zero mass. One model emerges as a prominent viable model with SM in teractions and I will outline its phenomenology.
    I will then discuss ano ther class of theories with vectorlike fermions in the adjoint representati on of the gauge group and discuss their non-standard cosmology and phenomen ology.

    Slides LAST-MODIFIED:20200124T191256Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191206T165000Z DTEND:20191206T173000Z DTSTAMP:20260828T094430Z UID:02i1u1n169kv6tnfcikgsndbm5@google.com CREATED:20191127T164255Z DESCRIPTION:*Please note the new time and location*\n\nTitle: Two-beam Coup ling Problem in Quantum Correlated Imaging \n\nSpeaker: Meng-Chang Wu\n\n Friday 6 December\, 12-12:30pm\n(pizza and drinks served 10 min. before tal k)\n\nLocation: 2324 Atlantic Building\n\n\nWe generate bright\, two-mode\, intensity-difference squeezed light from four-wave mixing (4WM) in Rb vapo r using Ti:Sapphire laser system. We achieve squeezing at frequencies below 10 Hz via dual-seeded 4WM. However\, we notice that there is excess noise at low frequencies for the dual-seeded scheme due to the two-beam coupling mechanism. This noise can be avoided by making sure the two probe seeds do not intersect each other in the pump region. In our previous work of "Entan gled Images from Four-Wave Mixing" we had similar “cross-talk” between the letters at low frequency. Based on the study of two-beam coupling mechanism \, we know how to avoid the "cross-talk" problem in the quantum correlated imaging. LAST-MODIFIED:20191127T164255Z LOCATION:2324 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201027T150000Z DTEND:20201027T160000Z DTSTAMP:20260828T094430Z UID:2t7133jmea5ik51vln8jd5rh56@google.com CREATED:20201007T161413Z DESCRIPTION:Speaker: \;Leo Radzihovsky \;(University of Colorado Bo ulder)\, Zoom seminar

    Title: \;Quantum smectic gauge theory
    < br>Abstract: \;We present a gauge theory formulation of a two-di mensional quantum smectic and its relatives\, motivated by their realizatio ns in correlated quantum matter. The description gives a unified treatment of phonons and topological defects\, respectively encoded in a pair of coup led gauge fields and corresponding charges. The charges exhibit subdimensio nal constrained quantum dynamics and anomalously slow highly anisotropic di ffusion of disclinations inside a smectic. This approach gives a transparen t description of a multi-stage quantum melting transition of a two-dimensio nal commensurate crystal (through an incommensurate crystal - a supersolid) into a quantum smectic\, that subsequently melts into a quantum nematic an d isotropic superfluids\, all in terms of a sequence of Higgs transitions.< br>

    Host Yang-Zhi Chou


    Email rcaw thor@umd.edu for Zoom details LAST-MODIFIED:20201007T161413Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181029T200000Z DTEND:20181029T210000Z DTSTAMP:20260828T094430Z UID:615iaoos4q7hfnf0uf0oekdok3@google.com CREATED:20181003T145722Z DESCRIPTION:Title: Understanding the Complex Networks Driving Cellular Deci sions\n\nSpeaker: Elijah Roberts\, Johns Hopkins University\n\nNotes: http: //www.marylandbiophysics.umd.edu/seminars/\n\nAbstract: Cellular phenotypes are intricate phenomena created by complex gene regulatory networks. Rathe r than remaining fixed in a given phenotypic state\, cells move along a rou gh epigenetic landscape. Mapping back and forth between regulatory networks and epigenetic landscapes is a grand challenge for biological physics. I w ill present results from two studies of these networks in microbes. First\, I will discuss a potential new source of epigenetic information in bacteri a. Using a model that combines molecular thermodynamics with mass-action ki netics\, we have shown that the build up of supercoiling due to transcripti on can introduce gene expression correlations within DNA topological domain s. These correlations may give rise to a new layer of weak interactions in the bacterial regulatory network. Second\, I will discuss recent results in understanding how the cell processes and stores information about gradient s. Using a multiscale model of the yeast-mating pathway\, we have shown how the bistable architecture of the mating pathway plays a crucial role in in tegrating directional information. We also hypothesize that the cell uses t he cytoskeleton to actively store information about spatial direction.​ LAST-MODIFIED:20181003T145722Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191030T183000Z DTEND:20191030T200000Z DTSTAMP:20260828T094430Z UID:5fq2o1j53faj9099rmmdcbmh5e@google.com CREATED:20191022T140320Z DESCRIPTION:Speaker: Jeremy Schnittman\, NASA Goddard Space Flight Center\n \nTitle: The Collisional Penrose Process and its Role in Dark Matter Annihi lation Around Black Holes\n\nAbstract: In 1969\, Roger Penrose showed that particles within the ergosphere region around a Kerr black hole could posse ss negative energy\, as measured by an observer at infinity. When captured by the horizon\, these negative energy particles essentially extract mass a nd angular momentum from the black hole. While the decay of a single partic le within the ergosphere is not a particularly efficient means of energy ex traction\, the {\\it collision} of multiple particles can reach arbitrarily high center-of-mass energy in the limit of extremal black hole spin. In th is talk we review the physics of the Penrose process\, and explore one pote ntially important astrophysical application: the annihilation of dark matte r particles in the vicinity of Kerr black holes\, where the gravitational f ield of the black hole acts effectively as a particle accelerator for the d ark matter. LAST-MODIFIED:20191022T140320Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181031T200000Z DTEND:20181031T213000Z DTSTAMP:20260828T094430Z UID:0noqg27plk2lu6h9i5b9vodbkb@google.com CREATED:20181026T172356Z DESCRIPTION:"First Results from the PROSPECT Reactor Neutrino Experiment"\n Speaker Name: Thomas Langford\nSpeaker Institution : Yale University\n\nAbs tract : PROSPECT is a short-baseline reactor antineutrino experiment design ed to search for eV-scale sterile neutrino oscillations and measure the 235 U antineutrino energy spectrum from the High Flux Isotope Reactor at Oak Ri dge National Laboratory. Deployed in early 2018\, the 4ton\, segmented\, 6L i-loaded liquid scintillator detector began commissioning in March of this year. The detector consists of 154 segments that span a baseline of 7-9m fr om the compact highly enriched uranium core\, enabling coverage of a wide r ange of oscillation parameter space. We will report on the first oscillatio n search and the upcoming precision measurement of the 235U antineutrino sp ectrum. LAST-MODIFIED:20181026T172515Z LOCATION:PSC room 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20201102T200000Z DTEND:20201102T210000Z DTSTAMP:20260828T094430Z UID:7vlm6qpvnlnlfa1jb0h0eqaf6v@google.com CREATED:20200902T091151Z DESCRIPTION:Seminar to be conducted via zoom.

    Speaker: Ofri Telem\, University of California Berkeley

    Title: Scattering Amplitudes for M onopoles: Pairwise Little Group and Pairwise Helicity

    Abstract: On-s hell methods are particularly suited for exploring the scattering of electr ically and magnetically charged objects\, for which there is no local and L orentz invariant Lagrangian description. In this paper we show how to const ruct a Lorentz-invariant S-matrix for the scattering of electrically and ma gnetically charged particles\, without ever having to refer to a Dirac stri ng. A key ingredient is a revision of our fundamental understanding of mult i-particle representations of the Poincaré group. Surprisingly\, the asympt otic states for electric-magnetic scattering transform with an additional l ittle group phase\, associated with pairs of electrically and magnetically charged particles. The corresponding "pairwise helicity" is identified with the quantized "cross product" of charges\, e1g2−e2g1\, for every charge-mo nopole pair\, and represents the extra angular momentum stored in the asymp totic electromagnetic field. We define a new kind of pairwise spinor-helici ty variable\, which serves as an additional building block for electric-mag netic scattering amplitudes. We then construct the most general 3-point S-m atrix elements\, as well as the full partial wave decomposition for the 2→2 fermion-monopole S-matrix. In particular\, we derive the famous helicity f lip in the lowest partial wave as a simple consequence of a generalized spi n-helicity selection rule\, as well as the full angular dependence for the higher partial waves. Our construction provides a significant new achieveme nt for the on-shell program\, succeeding where the Lagrangian description h as so far failed.

    Link to Seminar Slides LAST-MODIFIED:20201104T202927Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200408T150000Z DTEND:20200408T160000Z DTSTAMP:20260828T094430Z UID:39jqppji3aar9rtns6qs58404r@google.com CREATED:20200122T143634Z DESCRIPTION:Speaker: Frank Stillinger\, Princeton\n\nTitle: TBA\n\nAbstract : TBA LAST-MODIFIED:20200408T175109Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191112T160000 DTEND;TZID=America/New_York:20191112T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20191001T160000 CREATED:20190530T191015Z DESCRIPTION:
    Kiyong Kim\, University of Maryland


    Physic s and engineering of strong terahertz pulse generation

    Terahertz science and technologyis of great current interest due to its potential app lications in bio-medicalimaging and spectroscopy\, chemical/explosive detec tion\, wireless communication\,security scanning\, and plasma diagnostics. However\, few sources and detectors existin the terahertz frequency band. T his leaves a major gap between the opticaland microwave regions\, for which new high-power terahertz sources would have amajor impact. One promising s ource pioneered by my group and now adoptedworldwide is based on controllin g the laser-driven orbits of free electronsliberated by high field ionizati on of gases. In this talk\, I will presentrecent experiments that provide a better understanding of this process\, enablingus to achieve a world recor d in THz generation efficiency. This source willopen up new opportunities t o explore extreme terahertz-driven nonlinearprocesses in atoms\, molecules\ , and plasmas.

    LAST-MODIFIED:20191111T215735Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190923T110000 DTEND;TZID=America/New_York:20190923T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20190923T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Coherent Matterwave Emission from an Atomtronic Transis tor Oscillator \n\nSpeaker: Dana Anderson\, ColdQuanta\, Inc\n\nAbstract: A tomtronics is the atom dual of electronics in which atom flux substitute fo r electric current and chemical potential substitutes for electric potentia l. Among the most ubiquitous electronic components is the semiconductor tra nsistor\; it is ubiquitous because it provides gain\, and gain enables ampl ifiers\, oscillators\, switches\, logic\, etcetera\, providing functionalit y as complex as radios and smart phones. The transistor’s critical role in classical information processing leads us to consider analogs in the ultrac old atom domain where quantum characteristics can dominate circuit behavior . This work presents experimental and theoretical studies of an atom analog of the transistor consisting of a triple-well atomic potential produced wi th a hybrid system of magnetic and optical potentials. The transistor consi sts of three wells: a broad “source” well\, a narrow “gate” well\, and a br oad “drain” well. The wells are separated by two narrow potential barriers. We operate an atomtronic transistor circuit by preparing atoms in the sour ce well as a Bose-Einstein condensate having very low temperature. Here “ve ry low” means that the atomic thermal energy is on the order and less than the gate well energy level spacing and also the characteristic tunneling en ergies of the barriers. The gate well is nearly parabolic and can thus be t reated as a harmonic oscillator. In this low temperature regime\, the circu it operates in a manner much like a transistor oscillator and it emits a co herent matterwave. A many-body treatment of the gate well is combined with an equivalent circuit model of the transistor circuit to derive steady-stat e behavior.\n\nHost: Charles Clark LAST-MODIFIED:20190920T110352Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201030T170000Z DTEND:20201030T180000Z DTSTAMP:20260828T094430Z UID:0t4cogapekuqt1apuqrin87s8q@google.com CREATED:20200923T165537Z DESCRIPTION:Speaker: Suveen N. Mathaudhu\, Professor and Chair\, Materials Science &\; Engineering Program Mechanical Engineering Department\, Univ ersity of California\, Riverside

    Title: ShAPEing the Future: Novel M aterials via Solid State Processing

    Abstract: Conventional approaches to materials manufacturing have often relied on processing within a temper ature range that results in liquid phase formation of some of the constitue nts. These methods are often limited by the equilibrium phase formation sta tes available from the melt. In this work we will present findings on a rec ently-developed processing approach that enables complex\, unique microstru ctural evolution (often to pervasively metastable states) while remaining i n the solid phase state. Specifically\, the Shear Assisted Processing and E xtrusion (ShAPE) method will be highlighted via a number of vignettes from various classes of structural materials. Novel microstructural pathways\, t extural formation and mechanical properties will be discussed. These result s point to the ability to design and engineering novel materials with unpre cedented properties and performance.

    Bio:

    Suveen Mathaudhu serv es as a Professor in the Mechanical Engineering Department and Chair of the Materials Science and Engineering Program at UC Riverside\, where he studi es the underpinning mechanisms that will make metallic materials and compos ites lighter and stronger. He concurrently has a joint appointment as Chief Scientist at the Pacific Northwest National Laboratory in the Energy and E nvironment Directorate. He received his Ph.D. in Mechanical Engineering fro m Texas A&\;M University and subsequently served as an ORISE post-doctor al Fellow and then a Staff Scientist and Program Manager at the U.S. Army R esearch Laboratory and U.S. Army Research Laboratory\, respectively. Mathau dhu is a 2019 Presidential Early Career Award in Science and Engineering (P ECASE) awardee\, a 2016 NSF CAREER awardee\, and received the 2014 Norm Aug ustine Award for Outstanding Achievement in Engineering Communications from the American Association of Engineering Societies.


    ZOOM: via Zoom&n bsp\; Sherri Tatum \;st atum12@umd.edu LAST-MODIFIED:20200923T165537Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190306T160000Z DTEND:20190306T170000Z DTSTAMP:20260828T094430Z UID:68pigrpvobvohvd0eurtuacago@google.com CREATED:20190205T160859Z LAST-MODIFIED:20190205T160859Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190416T160000 DTEND;TZID=America/New_York:20190416T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190416T160000 CREATED:20180727T143919Z DESCRIPTION:\nIrving and Renee Milchberg Lecture\, to be held in 1412 John S. Toll Physics Building\nSpeaker: Susan Eisenhower\n\nTitle: Lessons from 1945: Ethics\, the War in Europe\, and its Enduring Legacy LAST-MODIFIED:20190530T190803Z LOCATION:John S. Toll Physics Building\, 4150 Campus Dr\, College Park\, MD 20740\, USA SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201116T110000 DTEND;TZID=America/New_York:20201116T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201116T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Synthetic lattices for synthetic quantum matter
    Speaker: Bryce Gadway\, University of Illinois at Urbana-Champaign

    Abstract: \; In recent decades\, artificial quantum "materials" bu ilt from ultracold atoms\, ultracold molecules\, and light have enabled the exploration of a range of phenomena of relevance to condensed matter physi cs\, as well as the realization of entirely new states of matter with no di rect analogs. Recently\, the introduction of approaches based on synthetic lattices or synthetic dimensions\, by which transport can be explored not i n a space but in alternative degrees of freedom like the spin of an atom\, has further broadened the scope of problems that can be addressed by quantu m matter based on atoms\, molecules\, and light. In this talk I'll review s uch synthetic approaches to analog quantum simulation experiments\, and I'l l discuss three "synthetic lattice" platforms -- based on laser-coupled mom entum states of ultracold atoms\, microwave-coupled Rydberg levels of trapp ed atoms\, and synthetically-coupled (classical) mechanical oscillators -- that we employ for the exploration of novel kinds of lattice transport phen omena.

    We are hosting the Fall 2020 JQI Seminars virtually as Zoom m eetings. JQI members and affiliates will receive a Zoom link in an email an nouncing each seminar. For those without access to Zoom\, we will also be l ive streaming each seminar on YouTube. Once a seminar starts\, you will fin d a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews \;(link \;is external) LAST-MODIFIED:20200929T022145Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191202T110000 DTEND;TZID=America/New_York:20191202T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191202T110000 CREATED:20190906T171016Z DESCRIPTION:Title: \;Trapped laser-cooled molecules for quantum scie nce \;

    Speaker: \;John Doyle\, Harvard University \;  \; \;

    Abstract: \;Due to the controllable complexity of cold polar molecules - in particular the body frame fixed electric dipo le of polar molecules - they are a potentially powerful platform for quantu m simulation. This has led to significant efforts to control molecules at t he quantum level. We report on laser cooling and trapping of molecules and the creation of optical tweezer arrays of ultracold CaF molecules in a sing le quantum state. We have also conducted collision studies using optical tw eezers\, demonstrating the potential for exploring state-selective ultra-co ld quantum chemistry on a molecule by molecule basis. These methods can be extended beyond diatomic molecules to polyatomic molecules\, which have yet additional features advantageous for quantum computation and precision mea surement. In the realm of quantum computing have advanced a scheme for quan tum computation using symmetric top molecules in optical tweezers. We will give a brief report on the possible achievable fidelity of this new\, poten tially very powerful quantum information platform. We will also discuss pro gress toward laser cooling of polyatomic molecules such as CaOH\, YbOH and YbOCH$_3$\, and their potential use in experiments\, including precision se arches for new particles\, beyond the standard model. LAST-MODIFIED:20191118T174028Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181113T181500Z DTEND:20181113T191500Z DTSTAMP:20260828T094430Z UID:4ha9rjqu3ql2fqiuflnh6iobfk@google.com CREATED:20180905T133028Z LAST-MODIFIED:20181030T145042Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200804T150000Z DTEND:20200804T160000Z DTSTAMP:20260828T094430Z UID:11lk9v89ge5jalkuius2p5uri2@google.com CREATED:20200729T125944Z DESCRIPTION:Speaker: Masaki Oshikawa


    Title:&nbs p\;Non-Fermi Liquids in 2d Conducting Networks

    Abstract:  \;We investigate 2-dimensional periodic superstructures consisting of 1 -dimensional conducting segments. Such structures naturally appear in twist ed transition metal dichalcogenides\, some charge-density-wave materials\, and a marginally twisted bilayer graphene\, in which intriguing non-Fermi l iquid transports have been experimentally observed. We model such a system as a network of Tomonaga-Luttinger Liquids\, and theoretically derive a var iety of non-Fermi liquid behaviors\, based on a Renormalization-Group analy sis of the junctions of Tomonaga-Luttinger Liquids. In particular\, a conti nuously varying resistivity exponent appears naturally in the 2-dimensional network through the continuously varying Luttinger parameter of the consti tuent Tomonaga-Luttinger Liquid. \;

    Email rcawthor@umd.edu for Z oom details. \; LAST-MODIFIED:20200729T125944Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201119T143000Z DTEND:20201119T153000Z DTSTAMP:20260828T094430Z UID:3k01mg4auv6a1s005ttjvbfb89@google.com CREATED:20201029T002659Z DESCRIPTION:
    Alexey Gorshkov\, NIST/University of Maryland

    Hellen Dinner Quantum Center\, Technion\, Israel

    Title: Dynamics of quantu m systems with long-range interactions

    Abstract: Atomic\, molecular\ , and optical systems often exhibit long-range interactions\, which decay w ith distance r as a power law 1/r^alpha. In this talk\, we will discuss bou nds on how quickly quantum information can propagate in such systems. We wi ll then discuss applications of these bounds to numerous phenomena includin g classical and quantum simulation of quantum systems\, prethermal phases i n Floquet systems\, entanglement area laws\, sampling complexity\, and scra mbling.


    Zoom link: \;https://technion.zoom.us/j/96019988142 LAST-MODIFIED:20201029T002659Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Virtual Quantum Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190404T123000 DTEND;TZID=America/New_York:20190404T133000 DTSTAMP:20260828T094430Z UID:0fmehb35rbcgkn34rs3f4s41rg@google.com RECURRENCE-ID;TZID=America/New_York:20190404T123000 CREATED:20190115T151128Z DESCRIPTION:Title: 'We have no good fundamental theory (of turbulence) at a ll': Was Feynman right?\nSpeaker: Gregory Eyink\nJohns Hopkins University | Department of Applied Mathematics\n\nAbstract: In his famous undergraduate physics lectures\, Richard Feynman remarked about the problem of fluid tur bulence: "Nobody in physics has really been able to analyze it mathematical ly satisfactorily in spite of its importance to the sister sciences.” This statement was already false when Feynman made it. Unbeknownst to him\, Lar s Onsager decades earlier had made an exact mathematical analysis of the hi gh Reynolds-number limit of incompressible fluid turbulence\, using a metho d that would now be described as a non-perturbative renormalization group analysis and discovering the first “conservation-law anomaly” in theoretica l physics. Onsager’s results were only cryptically announced in 1949 and he never published any of his detailed calculations. Onsager’s analysis was finally rescued from oblivion and reproduced by the speaker in 1994. The id eas have subsequently been intensively developed in the mathematical PDE co mmunity\, where deep connections emerged with John Nash’s work on isometri c embeddings. Furthermore\, the method has more recently been successfully applied to new physics problems\, compressible fluid turbulence and relativ istic fluid turbulence\, yielding many new testable predictions. This talk will briefly review Onsager’s exact analysis of the original incompressible turbulence problem and subsequent developments. Then a new application to kinetic plasma turbulence will be described\, with novel predictions for tu rbulence in nearly colllisionless plasmas such as the solar wind and the te rrestrial magnetosheath. LAST-MODIFIED:20190327T190516Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200317T171500Z DTEND:20200317T181500Z DTSTAMP:20260828T094430Z UID:4lsnft1e3ltdiik5749ms6gjvs@google.com CREATED:20200122T140954Z LAST-MODIFIED:20200122T140954Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR - SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181115T210000Z DTEND:20181115T220000Z DTSTAMP:20260828T094430Z UID:0u0c3mfcsr3nk1d797l40clpbb@google.com CREATED:20181023T190710Z DESCRIPTION:Title: Baryogengesis and Dark Matter from B Mesons\n\nSpeaker: Gilly Elor\, University of Washington\n\nAbstract: I will present a new mec hanism of low scale Baryogengesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from B meson oscillation and subsequent decays. This set-up is testable at hadron colli ders and B-factories. In the early Universe\, decays of a long lived partic le produce B mesons and anti-mesons out of thermal equilibrium. These then undergo CP violating oscillations before quickly decaying to visible and da rk sector particles. Dark matter will be charged under Baryon number so tha t the visible sector baryon asymmetry is produced without violating total b aryon number. The produced baryon asymmetry will be directly related to the leptonic charge asymmetry in neutral B decays\; and experimental observabl e. Furthermore\, this mechanism predicts new decay modes of B mesons into b aryons and missing energy -- which can be searched for at current and upcom ing experiments thus allowing for a distinct probe of our mechanism. LAST-MODIFIED:20181106T161516Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200224T213000Z DTEND:20200224T223000Z DTSTAMP:20260828T094430Z UID:17dpnkq2u93k8necv9k0rieqpu@google.com CREATED:20200220T004938Z DESCRIPTION:Title: Theoretical Model of Solar Type III Radio Bursts\n\nSpea ker: Peter Yoon\, IPST\, University of Maryland\n\nAbstract: "Solar radio b ursts are observed typically as type II bursts (produced by shock accelerat ed electrons)\, type III bursts (produced by flare accelerated electrons)\, and occasionally\, type IV bursts produced by trapped electrons). They pro vide remote indications of electron instabilities in the corona and inner h eliosphere\, relevant for understanding physical processes and also for pre dicting space weather" [from NASA web page]. Type I emission is a long last ing radio "storm" and Type V emission is related to type III radio bursts. Among the five types of solar radio emissions\, the type III is most intens ely studied since the late 1950s\, throughout 1960s and 1970s. In spite of the long history\, the rigorous first-principle based theoretical model was not available until quite recently. In this talk I will present first a tu torial on the basic understanding of solar radio emission phenomenology\, a nd later discuss recent developments.\n\nNotes: Coffee\, tea and snacks ava ilable from 4:15 to 4:30PM LAST-MODIFIED:20200220T004958Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201002T160000Z DTEND:20201002T164500Z DTSTAMP:20260828T094430Z UID:5smacelcshlh96qh461d7fea20@google.com CREATED:20200922T145211Z DESCRIPTION:Title: The importance of the spectral gap in estimating g round-state energies
    Speaker: Abhinav Deshpande
    Time : 12 - 12:45pm\, Friday\, Oct. 2


    Seminar will be held via Zoom:&nbs p\;https://umd.zoom.us/s/970993 28991 \;and Meeting ID : 970 9932 8991


    The field of quantum Hamiltonian complexity lies at the intersection of quantum many- body physics and computational complexity theory\, with deep implications t o both fields. The main object of study is the LocalHamiltonian problem\, w hich is concerned with estimating the ground-state energy of a local Hamilt onian. A major challenge in the field is to understand the complexity of th e LocalHamiltonian problem in more physically natural parameter regimes. On e crucial parameter in understanding the ground space of any Hamiltonian in many-body physics is the spectral gap\, which is the difference between th e smallest two eigenvalues. Despite its importance in quantum many-body phy sics\, the role played by the spectral gap in the complexity of the LocalHa miltonian is less well-understood. In this work\, we make progress on this question by considering the "precise" regime\, in which one estimates the g round-state energy to within inverse exponential precision.

    In this setting of inverse-exponential precision\, there is a surprising result tha t the complexity of LocalHamiltonian is magnified from a class called QMA\, the quantum generalization of NP to a class called PSPACE\, the class of p roblems solvable in polynomial space (but possibly exponential time). We cl arify the reason behind this boost in complexity. Specifically\, we show th at the full complexity of the high precision case only comes about when the spectral gap is exponentially small. As a consequence of the proof techniq ues developed to show our results\, we uncover important implications for t he representability and circuit complexity of ground states of local Hamilt onians\, the theory of uniqueness of quantum witnesses\, and techniques for the amplification of quantum witnesses in the presence of postselection.
    LAST-MODIFIED:20200922T145211Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI/QuICS/CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181129T160000Z DTEND:20181129T170000Z DTSTAMP:20260828T094430Z UID:7ai15tr30s89kdgjq9t98b3ko5@google.com CREATED:20181120T193150Z DESCRIPTION:\nStephan Welte\nMax Planck Institute for Quantum Optics\, Garc hing\, Germany\n\nQuantum information processing with photons and neutral a toms \n\nCavity QED systems constitute an ideal interface to connect flying and stationary qubits in a future quantum network. In this presentation\, stationary qubits are realized with trapped neutral atoms while flying qubi ts are encoded either in the polarization degree of a photon or in the phas e of a coherent laser pulse. I will present a series of experiments employi ng the strong nonlinearity provided by an atom-cavity system to implement f undamental building blocks for quantum information processing in a network- ready architecture. These experiments comprise a photon-photon quantum gate and a gate between two atoms in one cavity. Furthermore\, a probabilistic and heralded protocol to entangle two intra-cavity atoms will be introduced . Lastly\, the atom-cavity system allows for the deterministic generation o f entangled atom-light Schrödinger-cat states. I will present the generatio n and manipulation of these states as well as their potential for hybrid qu antum information processing between discrete and continuous variables. LAST-MODIFIED:20181120T193150Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190415T200000Z DTEND:20190415T210000Z DTSTAMP:20260828T094430Z UID:7hv7e996n0ddqtigka689ruqck@google.com CREATED:20190118T170538Z DESCRIPTION:Title: Functional roles of low complexity regions in the human proteome\n\nSpeaker: Haribabu Arthanari\, Harvard University\n\nNotes: http ://marylandbiophysics.umd.edu/seminars/\n\nAbstract: \n\nStructural biology studies over the last 50 years have provided an unprecedented view of stru ctured domains\, yet the structural details of a significant portion of the expressed proteome\, characterized by IDRs\, still remain in the dark. Res earch over the past decade has brought the functional significance of IDRs into the limelight. There are several established cases where disordered re gions of a protein and IDPs transition to a structured state when they enco unter a binding partner. Some of these interactions are weak\, yet critical \, dictated by need for a transient signal. Key cellular processes\, includ ing transcription and translation are orchestrated by many such interaction s. The business end of transcription factors\, the transactivation domain (TAD)\, is usually disordered and assume structure upon binding “helper” pr oteins such as co-activators and mediators to regulate transcription. The presentation will detail a structure-based approach to unravel the molecula r details the interaction between the TAD and a Mediator subunit and use th e information to target the interaction in two clinically relevant systems\ , affecting multiple drug resistance and lipogenesis. LAST-MODIFIED:20190329T170838Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20170911T190000Z DTEND:20170911T203000Z DTSTAMP:20260828T094430Z UID:2p6531ma5j074lcog9ptihlp7m@google.com CREATED:20170825T125047Z DESCRIPTION:Speaker: Ennio Salvioni\n\nSpeaker Institution: Technical Univ ersity of Munich\n\nTitle: Charged Composite Scalar Dark Matter\n \nAbstrac t: We consider a composite model where both the Higgs and a complex scalar \\chi\, which is the dark matter (DM) candidate\, arise as light pseudo Nam bu-Goldstone bosons from a strongly coupled sector with TeV scale confineme nt. The global symmetry structure is SO(7)/SO(6)\, and the DM is charged un der an exact U(1) \\subset SO(6) that ensures its stability. Depending on w hether the \\chi shift symmetry is broken or respected by the coupling of t he top quark to the strong sector\, the DM can have a weak-scale mass or be much lighter than the Higgs. These two scenarios lead to very distinct DM phenomenologies\, which I will discuss. The interplay with LHC physics will also be presented. Based on 1707.07685\, and work in progress. LAST-MODIFIED:20200108T224607Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201116T210000Z DTEND:20201116T223000Z DTSTAMP:20260828T094430Z UID:49coo22cbd9cjuqlmtf6a6j4vd@google.com CREATED:20200909T182200Z DESCRIPTION:Speaker: Jingnan Cai\, UMD


    Title:Chaos and Chimeras in Hysteretic rf SQUID Metamaterials

    Abstract:

    Radio frequency Superconducting Quantum Interference Device (rf SQUID) has been established as a viable building block for microwave frequency metamaterials [1\,2]. T he rf SQUID resonance is tunable under applied dc flux\, with upper-frequen cy range scaling as1+rf \;. Our previous design restricted the paramete r \;rf \;below unity to avoid hysteresis\, thus limited the resonan ce range. We have built new arrays of rf SQUID meta-atoms in the hysteretic regime (rf \;>\;1) to explore their interesting properties with the ultimate goal of extending the resonance frequency tunability. Much theoret ical work has predicted chaotic dynamics and chimera states in such systems . Results from microwave transmission measurements showing signs of these p henomena will be reported. We will also discuss the future work of observin g chimera in laser scanning microscopy \; [3]. This work is supported b y DOE through grant # DESC0018788.


    [1] \;Phys. Rev. X\, \ ;3\, 041029 (2013) \; \;https://doi.org/10.1103/PhysRevX.3.041029

    [2] \;Phys . Rev. X\, \;5\, 041045 (2015) \;https://doi.org/10.1103/PhysRevX.5.041045

    [3]&n bsp\;Appl. Phys. Lett. \;114\, 082601 (2019) \;https://doi.org/10.1063/1.5064658


    Adviso r: Anlage GroupAdvisor: Anlage Group


    Zoom Link \; &\; \; \;Log In Informa tion


    http s://umd.zoom.us/s/91198037643

    Meeting ID: 911 9803 7643 \;

    Password:558484 \;

    LAST-MODIFIED:20201109T211326Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jingnan Cai\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191101T160000Z DTEND:20191101T170000Z DTSTAMP:20260828T094430Z UID:45t2cvvkku1niickmboln6b35d@google.com CREATED:20191025T124624Z DESCRIPTION:Speaker: Simon Lieu\n\nFriday 1 Nov\, 12:10-12:40pm (pizza and drinks served 10 min. before talk)\n\n Title: "Tenfold way for quadratic L indbladians: Topological edge modes in open quantum systems"\n\nAbstract: " Topological band theory was developed to predict and explain robust feature s in the ground state electronic structure of insulators and superconductor s. A topological material is characterized by gapless modes localized at th e boundary of the sample\, which dictate the low-energy response. What are the fate of these edge modes when the system starts to couple to an environ ment? In this talk\, I will present a topological classification [1] applic able to open fermionic systems governed by a general class of Lindblad mast er equations. These `quadratic Lindbladians' can be captured by a non-Hermi tian single-particle matrix which describes internal dynamics as well as sy stem-environment coupling. We show that this matrix must belong to one of t en non-Hermitian Bernard-LeClair symmetry classes which reduce to the Altla nd-Zirnbauer classes in the closed limit. The Lindblad spectrum admits a to pological classification\, which we show results in gapless edge excitation s with finite lifetimes. Unlike previous studies of purely Hamiltonian or p urely dissipative evolution\, these topological edge modes are unconnected to the form of the steady state. We provide one-dimensional examples where the addition of dissipators can either preserve or destroy the closed class ification of a model\, highlighting the sensitivity of topological properti es to details of the system-environment coupling. [1] arXiv:1908.08834" LAST-MODIFIED:20191025T124624Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200225T150000Z DTEND:20200225T160000Z DTSTAMP:20260828T094430Z UID:6rpj9hrc09m5lii69i39f2f69c@google.com CREATED:20200220T142244Z DESCRIPTION:Title : Relativistic Nonthermal Particle Acceleration in 2D Pla smoid-Dominated Magnetic Reconnection

    Speaker Name: Dmitri Uzdensky< br>Speaker Institution : University of Colorado\, Boulder


    Abstra ct : Relativistic magnetic reconnection is commonly believed to be an effic ient mechanism for accelerating relativistic particles\, thus offering an a ttractive explanation for nonthermal high-energy emission from many astroph ysical sources. This view is strongly supported by solid and ample numerica l evidence\, mostly from first-principles kinetic plasma simulations\, wher eas our theoretical understanding of reconnection-driven nonthermal particl e acceleration (NTPA) remains incomplete. In this talk I will first overvie w the recent numerical progress on this problem\, and then will outline a c onceptual analytical model aimed at elucidating key physical processes that power NTPA in 2D hierarchical reconnecting plasmoid chains. In this model\ , the main reconnection electric field\, the 1st-order Fermi/curvature-drif t acceleration in contracting plasmoids\, and Fermi-type energy gain due to particle reflection off moving plasmoids all contribute to particle accele ration\, while particle trapping inside plasmoids plays the role of escape and governs the high-energy cutoff\, thus tying the particle spectrum to th e plasmoid distribution. \; \;


    Hosted by Marc Swisdak LAST-MODIFIED:20200220T163309Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Colloquia/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200928T110000 DTEND;TZID=America/New_York:20200928T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20200928T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Quantum Dot Molecules: Interesting physics and op portunities for scalable quantum devices

    Speaker: Matt Doty\, Univer sity of Delaware

    Abstract: \; Quantum dots are often described a s artificial atoms because they have discrete energy levels analogous to th ose of natural atoms. Solid state quantum dots (e.g. InAs in GaAs) can be e xtended from artificial atoms to artificial molecules by controlling the re lative spatial proximity and orientation of a pair of quantum dots. These p airs of dots are called quantum dot molecules (QDMs) because coherent tunne l coupling between the individual quantum dots leads to the formation of mo lecular states analogous to those in diatomic molecules. Unlike ‘natural’ m olecular states\, the properties of these artificial molecules can be varie d both during growth and in situ by applied fields. As a result\, QDMs pres ent a unique opportunity to apply molecular engineering principles to desig n new components for scalable optoelectronic quantum device technologies. I will first describe how a range of spintronic and photonic properties aris e from the structure\, composition\, and applied field environment of a QDM . I will then discuss how these properties lead to new opportunities for qu antum devices. Finally\, I will describe our progress toward overcoming pra ctical challenges to create a quantum-dot-based scalable material platform for quantum device applications. \;

    We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will r eceive a Zoom link in an email announcing each seminar. For those without a ccess to Zoom\, we will also be live streaming each seminar on YouTube. Onc e a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.y outube.com/user/JQInews \;(link \;is external) LAST-MODIFIED:20200925T163759Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200221T000000Z DTEND:20200221T013000Z DTSTAMP:20260828T094430Z UID:1sv087n6i643qlgjs5te1g8p8d@google.com CREATED:20200204T173333Z DESCRIPTION:Physics is Phun LAST-MODIFIED:20200204T173333Z LOCATION:1410 and 1412\, Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Physics of Fantastic Worlds TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201214T110000 DTEND;TZID=America/New_York:20201214T120000 DTSTAMP:20260828T094430Z UID:7ma09kiva49l3cprq9af3kg3vp@google.com RECURRENCE-ID;TZID=America/New_York:20201214T110000 CREATED:20200924T011350Z DESCRIPTION:Title: \; Ultracold bubbles in space: atomic physics aboard the International Space Station

    Speaker: Nathan Lundblad\, Bates Co llege

    Abstract: \; Exploring the effects of geometry\, topology\ , dimensionality\, and interactions on ultracold atomic ensembles has prove n to be a continually \;fruitful line of inquiry. One heretofore unexpl ored configuration for such ensembles is that of a bubble or shell\, where trapped atoms are confined in the vicinity of a spherical or ellipsoidal su rface. Such a system could offer new collective modes\, topologically-sensi tive behavior of quantized vortices\, self-interference and shell collapse\ , as well as the exploration of trapped ultracold systems with mm-scale spa tial extent. \; While techniques for the generation of bubble-shaped tr aps have been known since 2001\,  \;terrestrial gravity has thus far pr evented the observation of ultracold shells. \; \;
    With the cons truction of the NASA Cold Atom Lab (CAL) facility and its subsequent delive ry to the International Space Station (ISS) and commissioning as an orbital BEC facility in 2018\, experimental schemes requiring a sustained  \;m icrogravity environment are now possible. \; I will present recent CAL observations of trapped shells of ultracold atoms\, including a variety of shell configurations that are possible with this apparatus. \; I will a lso discuss the thermodynamics of ultracold shells and review open question s being explored in the current second science run of CAL aboard ISS. \ ; \;

    We are hosting the Fall 2020 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will f ind a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews< /a> \;(link \;is external) LAST-MODIFIED:20201109T132610Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191028T110000 DTEND;TZID=America/New_York:20191028T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191028T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Solid-State Spin-Photon Interfaces: Old Friends & New\n\ nSpeaker: Mete Attature\, University of Cambridge\n\nAbstract: Optically ac tive spins in solids offer exciting opportunities as scalable and feasible quantum-optical devices. Numerous material platforms including diamond\, se miconductors\, and atomically thin 2d materials are under investigation\, w here each platform brings some advantages of control and feasibility along with other challenges. The inherently mesoscopic nature of solid-state plat forms leads to a multitude of dynamics between spins\, charges\, vibrations and light. Implementing a high level of control on these constituents and their interactions with each other creates exciting opportunities for reali zing stationary and flying qubits within the context of spin-based quantum information science\, as well as investigating mesoscopic quantum systems. Quantum optics\, developed originally for atomic systems\, provides a very valuable toolbox for this endeavour. In this talk\, I will provide a snapsh ot of the progress and challenges for two contrasting examples for spin-pho ton interfaces\, namely semiconductor quantum dots and confined excitons in atomically thin materials. For the former\, I will focus on a method to su ppress the magnetic noise of the nuclear ensemble by an effective cooling m echanism. This method yields access to the nuclear sideband resolved regime and coherent coupling between a single electron spin and the nuclear ensem ble. For the latter\, I will discuss ways to deterministically trap long-la sting confined excitons acting as artificial atoms\, as well as their integ ration into opto-electronic devices. LAST-MODIFIED:20191023T002908Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200415T150000Z DTEND:20200415T160000Z DTSTAMP:20260828T094430Z UID:0gns734i6833kbslvi7pd8dh7e@google.com CREATED:20200122T143724Z DESCRIPTION:Speaker: TBA\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200122T143724Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20191021T110000 DTEND;TZID=America/New_York:20191021T120000 DTSTAMP:20260828T094430Z UID:0c11u7sidgvl3cik5lcumohka4@google.com RECURRENCE-ID;TZID=America/New_York:20191021T110000 CREATED:20190906T171016Z DESCRIPTION:Title: Quantum photonics enabling novel quantum computer applic ations\n\nSpeaker: Philip Walther\, Univ of Vienna\n\nAbstract: Quantum pho tonics allows for a variety of quantum information applications. Here I wil l present that the exploit of quantum photonics allows for enhanced data se curity for quantum and classical computers. The latter is based on feasible hybrid classical-quantum technology\, which shows promising new applicatio ns of readily available quantum photonics technology for complex data proce ssing. I will also show how optical quantum computers allow for novel archi tectures that rely on superimposed order of quantum gates. As outlook I wil l discuss technological challenges for the scale up of photonic quantum com puters\, and our group’s current work for addressing some of those. LAST-MODIFIED:20191015T184041Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190905T200000Z DTEND:20190905T213000Z DTSTAMP:20260828T094430Z UID:1phe34f62n3up9vhtp660j6oh6@google.com CREATED:20190826T143448Z DESCRIPTION:Soubhik Kumar\, UMD\n\nTitle: Primordial Non-Gaussianity as a p robe of (ultra high-energy) gauge theories.\n\nAbstract: Future measurement s of primordial non-Gaussianity (NG) can reveal the mass and the spin infor mation of cosmologically produced particles with masses of order the inflat ionary Hubble scale\, H_inf\, which can be as high as 10^13 GeV. In this ta lk\, I will describe how such NG measurements can be used to probe\, a) low scale gauge theories that get “heavy-lifted” to ~ H_inf scales and b) Gran d Unified Theories. I will also discuss a simple alternative to the standar d inflationary paradigm\, involving a curvaton field\, that can allow NG si gnals orders of magnitude larger compared to the standard inflation. This b rings various motivated particle physics signatures\, such as loops of heav y gauge-charged scalars and fermions\, within future observational reach. LAST-MODIFIED:20190903T150128Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190410T200000Z DTEND:20190410T213000Z DTSTAMP:20260828T094430Z UID:7eeojnpjhhc9c51tn9dad9ihk2@google.com CREATED:20190405T153658Z DESCRIPTION:Title : "Unraveling Cosmic Particle Mysteries with Multimesseng ers"\n\nSpeaker: Kohta Murase\, Penn State University \n\nAbstract : Abstra ct: New frontiers of astroparticle physics have been opened by IceCube's di scovery of high-energy cosmic neutrinos. Their origin is a new mystery in t he field\, and solving this problem may enable us not only to understand th e physics of astrophysical sources but also to obtain important clues about the old mystery\, the origin of cosmic rays\, and to utilize neutrinos as probes of neutrino properties\, dark matter\, and fundamental physics. In t his talk\, I discuss implications of the latest results of IceCube observat ions\, with emphases on multi-messenger approaches. I will review recent to pics about high-energy cosmic neutrinos\, including IceCube-170922A that co incided with a blazar flare\, a grand-unified cosmic particle model we rece ntly proposed. If we have time\, some implications to physics beyond the St andard Model will be discussed. LAST-MODIFIED:20190405T153707Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181004T123000 DTEND;TZID=America/New_York:20181004T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181004T123000 CREATED:20180827T142930Z DESCRIPTION:Title: SPEAKER CHANGE - Climate model shows large-scale wind an d solar farms in the Sahara increase rain and vegetation\nSpeaker: Dr. Safa Motesharrei - University of Maryland Department of Physics\n\nAbstract: Wi nd and solar farms offer a major pathway to clean\, renewable energies. How ever\, these farms would significantly change land surface properties\, and \, if sufficiently large\, the farms may lead to unintended climate consequ ences. In this study\, we used a climate model with dynamic vegetation to s how that large-scale installations of wind and solar farms covering the Sah ara lead to a local temperature increase and more than a twofold precipitat ion increase\, especially in the Sahel\, through increased surface friction and reduced albedo. The resulting increase in vegetation further enhances precipitation\, creating a positive albedo–precipitation–vegetation feedbac k that contributes ~80% of the precipitation increase for wind farms. This local enhancement is scale dependent and is particular to the Sahara\, with small impacts in other deserts. LAST-MODIFIED:20181001T131636Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200226T200000Z DTEND:20200226T210000Z DTSTAMP:20260828T094430Z UID:3g2t0e5sstccsb6sqvnnssfccl@google.com CREATED:20200220T132240Z DESCRIPTION:Title : 2D Magnets\, Heterostructures\, and Spintronic Devices< br>Speaker Name: Prof. Cheng Gong
    Speaker Institution : University of Ma ryland College Park\, ECE department
    Notes: **************************** *********************************************************2020 NEW VISITOR-POLICY: All colloquium attendees not possessing an LPS access badg e shall enter through the exterior side doors on the lower level. Take the exterior stairs to the right of the LPS front doors down to the lower level \; the entry double doors will be immediately at the bottom of the stairs. If elevator access is required\, use the phone to enter the lobby\, and som eone will escort you to the elevator and down to the lower level. Upon entr y and exit\, please sign in to and out of the logbook on the podium in the lower level entryway.
    Visitors to LPS wishing to access the upstairs lab spaces must fill out and process a visitor request form and show a photo I D before admittance\, which is best done prior to arrival through an LPS em ployee. A visitor request form is NOT required if only attending the colloq uium on the lower level.
    Access to the LPS lobby for information is perm itted by using the phone to the far left of the main entry doors.
    ****** ***************************************************************** **************
    For more information please contact Dave Bowen [    dbowen1@lps.umd.edu] or Prof. Isaak Mayergo yz.
    Note: LPS is located at 8050 Greenmead Drive in College Park. There is parking at LPS and overflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the C ourtyard Apts. Please use the phone on the left hand side of the front door to call the receptionist for entry.

    Abstract : Magnetism\, one of t he most fundamental physical properties\, has revolutionized significant te chnologies such as data storage and biomedical imaging\, and continues to b ring forth new phenomena in emerging materials and reduced dimensions. The recently discovered magnetic 2D van der Waals materials (hereafter abbrevia ted as “2D magnets”) provide ideal platforms to enable the atomically-thin\ , flexible\, lightweight magneto-optic and magnetoelectric devices. The sea mless integration of 2D magnets with dissimilar electronic and photonic mat erials further opens up exciting possibilities for unprecedented properties and functionalities. In this talk\, I will speak on our experimental obser vation of the 2D ferromagnet\, analyze the current progress and the existin g challenges in this emerging field\, and show how we push the boundary by exploring the potential of 2D antiferromagnets for spintronics. \;  \;


    Host: David Bowen LAST-MODIFIED:20200220T163507Z LOCATION:Laboratory For Physical Sci\, 8050 Greenmead Dr\, College Park\, M D 20740\, USA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquia/Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181114T143000 DTEND;TZID=America/New_York:20181114T153000 RRULE:FREQ=DAILY;COUNT=3 DTSTAMP:20260828T094430Z UID:7fggims4eovvo7ithchdk8k7la@google.com CREATED:20181112T194330Z DESCRIPTION:Three seminar dates\, two locations\nWednesday\, Nov 14 at 2:30 pm in PSC 1136\;\nThursday\, Nov 15 at 2:30pm in PSC 3150\;\nand Friday\, N ov 16 at 2:30pm in PSC 3150\n\nTitle: Relativistic Fluid Dynamics Out of Eq uilibrium\n\nSpeaker: Paul Romatschke\, University of Colorado\n\nAbstract: In standard textbooks\, fluid dynamics is often introduces as\na near-equi librium approximation to classical kinetic theory. Recent\nadvances both in theory for out-of-equilibrium quantum field theories\nand experimental dat a from high energy colliders have taught us that\nthe textbooks are wrong: fluid dynamics quantitatively applies in\nout-of-equilibrium\, and highly q uantum-mechanical\, situations. In\nthese lectures\, I will discuss how mod ern out-of-equilibrium fluid\ndynamics is set up\, how it relates to famili ar microscopic approaches\nsuch as kinetic theory and gauge/gravity duality \, and how and when it\nbreaks down. If time allows\, I'll also mention hyd rodynamics result\nfor high-energy nuclear collisions at the LHC as an appl ication of\nthis out-of-equilibrium fluid dynamics framework. LAST-MODIFIED:20181112T194330Z LOCATION:PSC 1136 or PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190311T203000Z DTEND:20190311T213000Z DTSTAMP:20260828T094430Z UID:5gl7i7mjp2dpmivp4i9r48ev32@google.com CREATED:20190216T051400Z DESCRIPTION:Title: Nonlinear dynamo in the intracluster medium\n\nSpeaker: Andrey Beresnyak\, Naval Research Lab\n\nAbstract: Massive galaxy clusters are filled with a hot\, turbulent and magnetized intra-cluster medium (ICM) . Still forming under the action of gravity\, they continually grow in mass even today. Turbulence heats the ICM and also amplifies magnetic field by way of dynamo action. This magnetic field was observed by Faraday rotation of background sources to have a magnitude of around a microGauss and the co rrelation scale of tens of kiloparsecs - the largest correlation scales so far observed in the Universe. The large scale of this field sparked a hope that they could be somehow connected to the primordial magnetic field in th e early universe - potentially shedding light on details of quantum field t heory\, such as phase transitions. A number of brute-force attempts to simu late cluster dynamo in cosmological context with MHD codes resulted in an o ptimistic view that the magnitude of cluster magnetic field at present time indeed sensitively depend on primordial field. In this talk I will explain in detail why this is likely to be erroneous. For this purpose I will over view the modern understanding of kinematic and nonlinear turbulent fluctuat ion dynamo - a kind of dynamo that operates in galaxy cluster. Using this k nowledge we come to\, perhaps counter-intuitive\, conclusion that the energ y components of the intra-cluster medium are ordered according to a permane nt hierarchy\, in which the ratio of thermal to turbulent to magnetic energ y densities remains virtually unaltered throughout the cluster's history\, despite evolution of each individual component and the drive towards equipa rtition of the turbulent dynamo. At the same time\, the scale of turbulence as well as the scale of the magnetic field are both fractions of the viria l scale\, e.g. the cluster size. This is a parameter-free model (seed field is also not a parameter) and the values for the magnitude and the scale of the magnetic field are broadly consistent with observations\, basically co nfirming the idea that the magnetic field in today's galaxy cluster is a re cord of its past turbulent activity.\n\nNotes: Coffee\, Tea & Snacks 4:15-4 :30 PM LAST-MODIFIED:20190216T051436Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200511T200000Z DTEND:20200511T213000Z DTSTAMP:20260828T094430Z UID:1rdjbressphucq12cj8pnl9ubp@google.com CREATED:20200103T141452Z DESCRIPTION:Will be conducted via zoom.\n\nSpeaker: Nicholas Rodd\, Berkele y\n\nTitle: Consistency of the Standard Model Effective Field Theory\n\nAbs tract: In this talk I will describe how causality and the analytic structur e of scattering amplitudes impose non-trivial constraints on the standard m odel effective field theory (SMEFT). For example\, in the bosonic sector\, I will explain how the bounds imply restrictions on the size of certain CP- odd operators by associated CP-even couplings. This result can be exploited to reveal a connection between constraints derived at colliders and limits on the neutron electric dipole moment. Further\, I will demonstrate that i n the fermionic sector\, IR consistency requires that flavour violating dim ension 8 operators are bounded by the flavour conserving variants. I will r eview how these bounds arise generally\, and demonstrate how they are satis fied by a wide variety of UV completions. LAST-MODIFIED:20200507T150112Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201009T190000Z DTEND:20201009T200000Z DTSTAMP:20260828T094430Z UID:4vahhus661hhebddp2901embrq@google.com CREATED:20201006T114601Z DESCRIPTION:Speaker: \; Sam Gralla\, University of Arizona

    Title : Black holes: from the image to the photon ring


    Abstract: \ ; The EHT collaboration has released millimeter-wave interferometric observ ations of the core of the galaxy M87 (henceforth M87*). \; The data are consistent with expectations for an accreting supermassive black hole\, bu t lack the precision and coverage required to distinguish between models of accretion flow or test theories of gravity. \; However\, the observati ons establish the source as a very promising target for future precision me asurements. \; After reviewing the EHT observations and data analysis\, I will discuss a proposal for a space mission targeting M87*. \; The i dea is to observe the predicted “photon ring” due to photons that orbit the black hole before arriving at the detector. \; We find that the GR-pre dicted shape of the photon ring is remarkably independent of astrophysical assumptions\, and forecast that the Kerr-black-hole nature of M87* can be t ested with an estimated 0.05% precision.
    For Zoom information\, please c ontact \;John Cullinan: jcullina@umd. edu LAST-MODIFIED:20201006T115320Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181205T160000Z DTEND:20181205T173000Z DTSTAMP:20260828T094430Z UID:7cb586i55p5alc32rf1d0khjgg@google.com CREATED:20181004T175217Z DESCRIPTION:Title: Experimentally bounding deviations from quantum theory i n the landscape of generalized probabilistic theories\n\nAbstract: Many exp eriments in the field of quantum foundations seek to adjudicate between qua ntum theory and speculative alternatives to it. This requires one to analyz e the experimental data in a manner that does not presume the correctness o f the quantum formalism. The mathematical framework of generalized probabil istic theories (GPTs) provides a means of doing so. We present a scheme for determining what GPTs are consistent with a given set of experimental data . It proceeds by performing tomography on the preparations and measurements in a self-consistent manner\, i.e.\, without presuming a prior characteriz ation of either. We illustrate the scheme by analyzing experimental data fo r a large set of preparations and measurements on the polarization degree o f freedom of a single photon. We find that the smallest and largest GPT sta te spaces consistent with our data are a pair of polytopes\, each approxima ting the shape of the Bloch Sphere and having a volume ratio of 0.977 +- 0. 001\, which provides a quantitative bound on the scope for deviations from quantum theory. We also demonstrate how our scheme can be used to bound the extent to which nature might be more nonlocal than quantum theory predicts \, as well as the extent to which it might be more or less contextual. Spec ifically\, we find that the maximal violation of the CHSH inequality can be at most 1.3% +- 0.1 greater than the quantum prediction\, and the maximal violation of a particular noncontextuality inequality cannot differ from th e quantum prediction by more than this factor on either side. (Joint work with Michael Mazurek\, Matthew Pusey\, and Kevin Resch\, based on arXiv:171 0.05948) LAST-MODIFIED:20181004T175217Z LOCATION:PSC1136 : QuICS Seminar SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PSC1136: QuICS Seminar - Rob Spekkens (Perimeter Institute) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181202T000000Z DTEND:20181202T013000Z DTSTAMP:20260828T094430Z UID:03uqlncbv8ol1cnteths842hvn@google.com CREATED:20181119T214230Z DESCRIPTION:From Platinum Cylinder to Planck's Constant: The Biggest Revolu tion in Measurement since the French Revolution\nWilliam D. Phillips\, Prof essor and Nobel Laureate\nJoint Quantum Institute\, National Institute of S tandards and Technology\, University of Maryland\n\nVanderlei S. Bagnato\, Professor and Director of São Carlos Institute of Physics\, University of S ão Paulo\n\n\nJoin us for a lively lecture\, accessible to the general publ ic\, with demonstrations of the physical principles involved in metrology\, including a live demonstration of the new realization of the kilogram.\nht tps://umdphysics.umd.edu/images/studentservices/Outreach/Slider/Dec1Phillip sBagnatoTalk_flyer_final.jpg LAST-MODIFIED:20181119T215736Z LOCATION:1412 Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics public lecture: Phillips & Bagnato TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201109T210000Z DTEND:20201109T220000Z DTSTAMP:20260828T094430Z UID:1ruk3l7bing4ockkp763it8fih@google.com CREATED:20200922T142234Z DESCRIPTION:Speaker: \;TBA

    Title: \;TBA

    Abstract: TBA


    Topic: B iophysics Seminar
    Time: Nov 9\, 2020 04:00 PM Eastern Time (US and Cana da) \;  \;
    Join Zoom Meeting
    https://umd.zoom.us/j/ 92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    M eeting ID: 926 8220 2606
    Passcode: 741889     \; \; LAST-MODIFIED:20200922T142558Z LOCATION:Online Seminar -- Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181109T180000Z DTEND:20181109T190000Z DTSTAMP:20260828T094430Z UID:1mj09i4gb9mq7tkdj8ar3mh2ie@google.com CREATED:20180905T153205Z DESCRIPTION:Speaker: Carlton E. Green\, Ph.D.\, Director of Diversity Tr aining and Education\, UMCP Office of Diversity and Inclusion \;


    Title: I Get Diversity\, But What Is Inclusion...in STEM ?


    Abstract: Whereas the University of Maryland has a reputation for being a diverse\, international community\, having co nversations about diversity or understanding why it even matters can be cha llenging. Let’s come together to explore some common myths about diversity in STEM fields\, while also learning some language and skills for creating inclusive and mutually respectful interactions. LAST-MODIFIED:20181101T190926Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181106T160000 DTEND;TZID=America/New_York:20181106T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181106T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Pablo Jarillo-Herrero\, MIT\n\nTitle: Magic Angle Gra phene: a New Platform for Strongly Correlated Physics\n\nAbstract: The und erstanding of strongly-correlated quantum matter has challenged physicists for decades. Such difficulties have stimulated new research paradigms\, suc h as ultra-cold atom lattices for simulating quantum materials. In this tal k I will present a new platform to investigate strongly correlated physics\ , based on graphene moiré superlattices. In particular\, I will show that w hen two graphene sheets are twisted by an angle close to the theoretically predicted ‘magic angle’\, the resulting flat band structure near the Dirac point gives rise to a strongly-correlated electronic system. These flat ban ds exhibit half-filling insulating phases at zero magnetic field\, which we show to be a correlated insulator arising from electrons localized in the moiré superlattice. Moreover\, upon doping\, we find electrically tunable s uperconductivity in this system\, with many characteristics similar to high -temperature cuprates superconductivity. These unique properties of magic-a ngle twisted bilayer graphene open up a new playground for exotic many-body quantum phases in a 2D platform made of pure carbon and without magnetic f ield. The easy accessibility of the flat bands\, the electrical tunability\ , and the bandwidth tunability though twist angle may pave the way towards more exotic correlated systems\, such as quantum spin liquids or correlated topological insulators.\n\nHosted by: JP Paglione LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191111T213000Z DTEND:20191111T223000Z DTSTAMP:20260828T094430Z UID:2r17a2saulmrgq2qvd77qm514h@google.com CREATED:20191016T190523Z DESCRIPTION:Title: New Mission Concept: Investigation of the Galactic Cente r in energy range 0.1 - 10 MeV with the Galactic Center Explorer

    Spe aker: Alexander Moiseev\, NASA Goddard Space Flight Center

    Abstract: The European Space Observatory INTEGRAL has been providing excellent results on X-ray and γ-ray astron omy since its launch in 2004. Among the most important results are the spec troscopy and imaging measurements of celestial γ-ray sources\, including ma pping of 511 keV radiation from the Galactic plane. However the nature of t he Galactic Center region 511 keV positron annihilation line is still a mys tery. Similarly\, the structure and nature of the Galactic Center supermass ive black hole and its surroundings\, as well as the structure of heavily p opulated sky regions such as Cygnus and Carina in γ-rays remain unclear. In particular\, understanding of the origin of the Fermi Bubbles&nbs p\;and of the γ-radiation bulge at the Galactic Center are high on the list of fundamental problems of astrophysics and can possibly solve the enigma of the nature of dark matter. I will present a concept of a potential new-g eneration γ- ray telescope with the major objectives a) investigate the Gal actic Center region 511 keV positron annihilation line by mapping the Galac tic Center region with high energy (<\;1% FWHM) and angular (<\; 10 arc min) resolution and with line sensitivity <\;10^-5 ph cm^-2 s^-1\; b) und erstand the nature of the Galactic Center supermassive black hole environme nt and surrounding region by creating an intensity map with high spectral ( <\;1% at 1 MeV) and spatial (1' - 10') resolution for the photon energy r ange 0.1 - 10 MeV\; and c) explore Galactic chemical evolution and sites of explosive element synthesis by conducting high-sensitivity measurements of nuclear lines from supernovae 1a and from other objects. GalCenEx \;will also be able to detect γ-ray bursts and determine their location\, contributing to mult imessenger astrophysics. The instrument is based on a novel high-energy and position resolution CdZnTe calorimeter\, coded aperture mask and heavy-sci ntillator shield\, and can be considered for a NASA Explorer mission.
    Notes: Coffee\, tea and snacks 4:15 - 4:30PM LAST-MODIFIED:20191016T190647Z LOCATION:Atlantic Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200922T150000Z DTEND:20200922T160000Z DTSTAMP:20260828T094430Z UID:0a1r7fpj83nr00ekcbruusumgv@google.com CREATED:20200915T181609Z DESCRIPTION:
    Speaker: David Huse \;(Princeton)

    Title: \;Many-body-localization to thermalization phase t ransition

    Abstract: \;I will present our cu rrent understanding of this novel phase transition as obtained from a stron g-randomness real-space renormalization group (RG) approach. This is for th e case of isolated one-dimensional quantum many-body systems with quenched randomness and short-range interactions. The RG flow is qualitatively like the famous Kosterlitz-Thouless RG\, but is different in some important feat ures\, thus making a new universality class of phase transition. Time permi tting\, I will then try to set this result in the context of the much large r set of transitions and crossovers found in other cases of this transition \, such as varying the dimension of space\, random vs nonrandom\, and chang ing the range of the interactions.

    Host Yang-Zhi Ch ou

    Email rcawthor@umd.edu for Zoom details LAST-MODIFIED:20200915T181609Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201123T200000Z DTEND:20201123T210000Z DTSTAMP:20260828T094430Z UID:2fkqa4q140kso9a7nbp6m2jirj@google.com CREATED:20200930T133459Z DESCRIPTION:
    Speaker: Yu-Dai Tsai\, Fermilab

    Title: "New Models a nd Experiments at the High-Energy Intensity Frontier: Resonant SIDM\, FORMO SA\, and LongQuest"

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20201122T155752Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201116T213000Z DTEND:20201116T223000Z DTSTAMP:20260828T094430Z UID:094v8v3dt832bqija6kdhcmq8n@google.com CREATED:20201104T191342Z DESCRIPTION:Title: \;LZ: A laboratory search for particulate dark matte r

    Speaker: Carter Hall\, Department of Physics\, University of Maryl and

    Abstract: A laboratory detection of the Milky Way's dark matter halo would be a spectacular confirmation of modern cosmology. I will review recent results in the search for dark matter of the WIMP variety\, and des cribe the status of the \;LZ experiment\, a seven tonne liquid xenon \;TPC \;which will begin operating early next year.
    Visit \;https://bit.ly/2PmJoT6 \;for access. LAST-MODIFIED:20201104T191342Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190325T190000Z DTEND:20190325T203000Z DTSTAMP:20260828T094430Z UID:1jr1bpb7shlhg4jkh72fhrvr9r@google.com CREATED:20190221T191324Z DESCRIPTION:

    Patrick Komiske\ , MIT

    Title: The (Metric) Space of Collider Events
    Abs tract: When are two collider events similar? In this talk\, I will answer t his question by introducing a natural metric between the radiation patterns of events. The metric is based on the well-known earth mover’s distance (E MD)\, and intuitively is the minimum “work” required to rearrange the energ y flow of one event into the other. The EMD allows one to resolve the struc ture of an abstract "space of events" using a variety of tools for analyzin g and visualizing events. Using jets at the LHC as an extended case study\, I will highlight connections to the space of infrared and collinear safe o bservables\, classification\, dimensionality of event manifolds\, and to ma chine learning and data visualization more broadly.
    LAST-MODIFIED:20190322T131621Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200122T193000Z DTEND:20200122T203000Z DTSTAMP:20260828T094430Z UID:4t3l2qioev8b1lt711t2vgchfm@google.com CREATED:20200115T223939Z DESCRIPTION: \;Title : Computational prediction of correlated iro n compounds at high pressure and experimental observations
    Speaker Name: Dr. Duck Young Kim
    Speaker Institution : Center for High Pressure Scien ce and Technology Advanced Research

    Abstract : In high-pressure rese arch\, computational materials design becomes an essential tool prior to ex perimental synthesis by predicting crystal structures and to estimate physi cal/chemical properties in extreme conditions\, which enables in silico exp eriments. Iron is one of the key elements in our contemporary technology an d the backbone element of the Earth. Thus\, study on pure iron and iron com pounds is important and finding new iron compounds is particularly of our i nterest. In this talk\, I will present recent progress in finding novel iro n compounds by synergic efforts from both computational condensed matter th eory and experiment. Computationally we used ab initio structure searching strategies to predict the compositions and crystal structures based on dens ity functional theory\, which were successfully synthesized by experiments [1\,2]. Dynamic mean field theory provides more precise description for the electronic structure of the predicted compounds by revealing metal-insulat or transition\, and spin transition induced by pressure [3\, 4]. I will als o discuss possible implications for geoscience of these studies [5].


    [1] Nature 534 241-244 (2016)
    [2] Nature 551 494-497 (2017 )
    [3] Phys. Rev. B 95 075114 (2017)
    [4] Phys. Rev. B 100 014418 (201 9)
    [5] arXiv:1810.08766

    *NEW POLICY: All Visitors to LPS must p resent a photo ID for entry to the colloquium*


    Note: LPS is loca ted at 8050 Greenmead Drive in College Park. There is parking at LPS and ov erflow parking at the adjacent LTS building but not at the 4H building. LPS is on the UMCP shuttle route\; take #105 for the Courtyard Apts. Please us e the phone on the left hand side of the front door to call the receptionis t for entry.
    For more information please contact Dave Bowen [dbowen1@lps .umd.edu] or Prof. Isaak Mayergoyz. LAST-MODIFIED:20200115T223939Z LOCATION:8050 Greenmead Drive\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190409T171500Z DTEND:20190409T181500Z DTSTAMP:20260828T094430Z UID:2nsg4qgjufqfhu4jkmaes50g46@google.com CREATED:20190205T174810Z DESCRIPTION:Speaker: Professor Jan Sengers\, UMCP\n\nTitle: Nonequilibrium Casimir Forces in Liquid Layers\n\nAbstract: It has now been well establish ed that liquids in nonequilibrium states exhibit long- range thermal fluctu ations that encompass the entire system. As a consequence\, in confined liq uid layers they will cause fluctuation-induced forces\, commonly called Cas imir forces. A well-known example is that of critical Casimir forces\, orig inally predicted by Fisher and de Gennes. In this talk we shall review Casi mir forces in liquid layers induced by a temperature gradient\, a concentra tion gradient\, and a velocity gradient. Most interestingly\, nonequilibriu m Casimir forces induced by a temperature or a concentration gradient turn out to be much larger than Casimir forces previously encountered in soft co ndensed matter. LAST-MODIFIED:20190402T135511Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190906T140000Z DTEND:20190906T153000Z DTSTAMP:20260828T094430Z UID:1al5fg1bsdepsoercsr0b99jln@google.com CREATED:20190827T123859Z DESCRIPTION:Speaker: Dr. Lars Berglund\, Professor/Division Head\, Royal In stitute of Technology\, Sweden\n\nTitle: Cellulosic Nanomaterials: Processi ng and Structural Control\n\nAbstract: Cellulosic materials are of increasi ng interest due to their potential in eco-friendly materials\, but also due to research progress in the nanocellulose area. Long slender cellulose nan ofibrils\, or shorter\, rod-like cellulose nanocrystals are studied for bas ic understanding and for use in new cellulosic nanomaterials such as films\ , membranes\, polymer matrix nanocomposites\, coatings\, adhesives\, aeroge ls\, foams\, inorganic/organic hybrids and novel types of functional materi als\, including applications in organic electronics and photonics.\n\nNanoc ellulose materials are already used in industry\, but nano-structural chara cteristics are not fully controlled and used. The reason is the difficulty to realize controlled nanoscale component assembly under the demands of ind ustrial scale processing. In order to address these challenges\, better cha racterization methods are needed. New processing concepts\, in particular i n the context of polymer nanocomposites\, are also needed where structural control can be exercised. Interface problems need to be addressed\, in part icular in the context of moist environments\, where properties of cellulosi c materials are sensitive to changes in external conditions.\n\nSpecific ch allenges with cellulosic materials are presented with the objective to anal yze possibilities to obtain true nano-structural control. Although plant-ba sed nanocellulose “particles” can be chemically heterogeneous\, and the siz e distribution can be wide\, there is a need for underpinning research in s upport of technical developments in eco-friendly and functional cellulose m aterials. LAST-MODIFIED:20190827T123859Z LOCATION:1146 AV Williams Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201012T190000Z DTEND:20201012T200000Z DTSTAMP:20260828T094430Z UID:5orst0rvc2vcooja9rmeiaj30g@google.com CREATED:20200825T183208Z DESCRIPTION:Seminar to be conducted via zoom.\n\n Speaker: Ningqiang Song\, Queen's University\n\nTitle: A microscopic black hole window on large extr a dimensions and dark matter\n\nAbstract: Hoop conjecture suggests that mic roscopic black holes can be produced in collisions of high energy particles if the fundamental gravity scale is lowered to the electroweak scale in ex tra dimension models. This opens up the possibility of studying extra dimen sions in collliders and neutrino telescopes. In this talk\, I will introduc e the unique signatures associated with black holes from cosmic neutrino-nu cleon scattering in IceCube-Gen2. These signatures include new topologies\, distinct energy distributions and unusual ratios of hadronic-to-electronic energy deposition. I will also discuss the study of dark sector in future colliders through the investigation of the production and decay of microsco pic black holes and the implications of these black holes for the early uni verse.\n\n\nFor zoom link please contact mknouse@umd.edu LAST-MODIFIED:20201005T160043Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200227T153000Z DTEND:20200227T160000Z DTSTAMP:20260828T094430Z UID:4qoqc1ee0sn9e612ourhn8qjeo@google.com CREATED:20200220T184241Z DESCRIPTION:

    Title: Large-Scale Quantum Photonic Processors

    Speaker: Dr. Jacques Carolan\, Niels Bohr Institute\, University of Cope nhagen

    Abstract

    Photons play a central role in many areas of quantum information science\, either as qubit themselves or to med iate interactions between long-lived matter based qubits. Techniques for (1 ) high-fidelity generation\, (2) precise manipulation and (3) ultra-efficie nt detection of quantum states of light are therefore a prerequisite for vi rtually all quantum technologies. A quantum photonic processor is the union of these three core technologies into a single system\, and\, bolstered by advances in integrated photonics\, promises to be a versatile platform for quantum information science. In this talk\, we present recent progress tow ards large-scale quantum photonic processors and demonstrate how such syste ms enable new applications at the nexus of quantum mechanics and machine le arning.

     \;

    Bio: Jacques Carolan received his MSci in Physics and Philosophy from the University of Bristol in 2011 wher e he then joined the Centre for Quantum Photonics to earn a PhD in 2015.&nb sp\; He joined the Quantum Photonics Laboratory at MIT as a Postdoctoral Fe llow in 2016 and after receiving a Marie Skłodowska-Curie Global Fellowship \, joined the Quantum Photonics Group at the Niels Bohr Institute in 2019.& nbsp\; He was a 2014 EPSRC ICT Pioneer\, attended the 66th Lindau Nobel Lau reates Meeting in 2016 on behalf of the Royal Society and won an Institute of Physics QEP thesis Commendation and UOB Faculty of Science Commendation for his thesis work.

    LAST-MODIFIED:20200220T184241Z LOCATION:AVW 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Seminar - Dr. Jacques Carolan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191022T173000Z DTEND:20191022T190000Z DTSTAMP:20260828T094430Z UID:3uqies4omb1p3rpo549vn1n75k@google.com CREATED:20191015T175234Z DESCRIPTION:Feng Yuan\, Lawrence Berkeley Lab\n\nTitle: Gluonic Probe for t he Short Range Correlation in Nucleus\n\nAbstract: We propose to study the gluonic probe to the nucleon-nucleon short range correlation (SRC) in nucle us through heavy flavor production in deep inelastic scattering (DIS). The relevant EMC effects of Charm structure function will provide an universali ty test of the SRCs which have been extensively studied in the quark-channe l. These SRCs can also be studied through the sub-threshold production of h eavy flavor in eA collisions at the intermediate energy electron-ion collid er\, including open Charm and J/\\psi (\\Upsilon) production. LAST-MODIFIED:20191017T191438Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200304T180000Z DTEND:20200304T190000Z DTSTAMP:20260828T094430Z UID:39ct23p2fbj7u9qhhikru052ff@google.com CREATED:20200227T134742Z DESCRIPTION:

    Magnetic Reconnection: A Powerful Cosmic Par ticle Accelerator

    Fan Guo (Los Alamos NationalLabor atory)

    Astrophysical sites of magnetic reconnection have long been expected to be sources of high-energy particles and radiation. R ecent observations of high-energy astrophysical sources as well as solar fl ares have motivated us to better understand magnetic reconnection and its a ssociated particle acceleration in plasma conditions where the magnetic ene rgy is dominant. I will present fully kinetic particle-in-cell simulations of anti-parallel magnetic reconnection in the highly magnetized regime (mag netization parameter much higher than unity and plasma beta much less than unity). We find that the magnetic energy is efficiently converted into kine tic energy of nonthermal relativistic particles in a power-law spectrum in both two-dimensional and three-dimensional simulations. For a sufficiently large system and strong magnetic field\, the power-law index approaches “-1 ”. We have now demonstrated\, through a combination of advanced diagnostics and theoretical analysis\, that the dominant acceleration mechanism is a F ermi-like process accomplished through the curvature drift motion of partic les in magnetic flux tubes along the electric field induced by fast plasma flows. I will present an analytical model for the formation of power-law di stribution and show the nonthermal distribution may be a common feature of magnetically dominated reconnection. \; In the end\, I will provide an outlook of future development that this work triggers.

    LAST-MODIFIED:20200228T211812Z LOCATION:3150 PSC\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170227T110000 DTEND;TZID=America/New_York:20170227T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170227T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Amy Mullin\, UMD Chemisty\nTitle: Dynamics of super ro tor molecules in an optical centrifuge\nAbstract: TBD LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20190311T190000Z DTEND:20190311T203000Z DTSTAMP:20260828T094430Z UID:3nrh35edj3jk1mn9ci2lnfdc1t@google.com CREATED:20190128T175843Z DESCRIPTION:

    Yushin Tsai\, UM D
    Title Cosmological Probes of the Invisible Universe

    Abstract: (This will be a colloquium level talk for non-specialist audience) In the next decade\, precision cosmological data from Cosmic Mic rowave Background and Large Scale Structure observations will improve in se nsitivity by more than an order of magnitude. In addition\, gravitational w ave signals may allow us to see through the plasma background to study the universe at the very earliest times\, immediately after the Big Bang. I wil l discuss the prospects for using these cosmological signals to study the i nvisible universe\, including the unknown properties of neutrinos and dark sector particles\, and quantum fluctuations in the primordial dark age. LAST-MODIFIED:20190307T155456Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201021T183000Z DTEND:20201021T200000Z DTSTAMP:20260828T094430Z UID:7lva4opbtm7c38liko0amrhar5@google.com CREATED:20201014T143336Z DESCRIPTION:Email rcawthor@umd.edu for Zoom details

    2:30 p m - Fidelity of a sequence of SWAP operations on a spin chain

    < b>Speaker    : Robert E. Throckmorton

    Abstract: We consider the “transport” of the state of a spin across a Heisenberg-coupled spin cha in via the use of repeated SWAP gates\, starting with one of two states—one in which the
    leftmost spin is down and the others up\, and one in whic h the leftmost two spins are in a singlet
    state (i.e.\, they are entang led)\, and the others are again all up. More specifically\, we transport the state of the leftmost spin in the first case and the next-to-leftmost spin in the second to the
    other end of the chain\, and then back again . We accomplish our SWAP operations here by
    increasing the exchange cou pling between the two spins that we operate on from a base value
    J to a larger value J_SWAP for a time t = ÄpiÄhbar/4J_SWAP. We determine the fide lity of this
    sequence of operations in a number of situations—one in wh ich only nearest-neighbor coupling
    exists between spins and there is no magnetic dipole-dipole coupling or noise (the most ideal
    case)\, one i n which we introduce next-nearest-neighbor coupling\, but none of the other effects\,
    and one in which all of these effects are present. In the la st case\, the noise is assumed to be
    quasistatic\, i.e.\, the exchange couplings are each drawn from a Gaussian distribution\, truncated
    to on ly nonnegative values. We plot the fidelity as a function of J_SWAP to illu strate various
    effects\, namely crosstalk due to coupling to other spin s\, as well as noise\, that are detrimental to
    our ability to perform a SWAP operation. Our theory should be useful to the ongoing
    experimenta l efforts in building semiconductor-based spin quantum computer architectur es.
    Reference: Robert E. Throckmorton and S. Das Sarma\, Phys. Rev. B 1 02\, 035439 (2020).

    3:00 pm - How to measure Hall conductivi ty in a superconductor

    Speaker: Victor Yakovenko

    Abstract: Superconductivity in some materials spontaneously breaks time -reversal symmetry\,
    as detected by the magneto-optical polar Kerr effe ct. The latter is determined by the
    high-frequency ac Hall conductivity \, but these superconductors are also expected to have
    non-zero spontan eous dc Hall conductivity. We propose a method for measuring the
    low-fr equency Hall conductivity in such superconductors. The method is based on a Corbino
    disk geometry\, where an oscillating axial magnetic field indu ces circular electric field\, which\, in
    turn\, induces radial charge o scillations due to the Hall conductivity. The signal\, albeit weak\, can be picked up by a coaxial cable.

    3:30 pm - Theory of Anoma lous Floquet Higher-Order Topology: Classification\,
    Characterization\, and Bulk-Boundary Correspondence

    Speaker: Ruixing Zhang

    Abstract: Periodically-driven or Floquet systems can realize an omalous topological phenomena
    that do not exist in any equilibrium stat es of matter\, whose classification and characterization
    require new th eoretical ideas that are beyond the well-established paradigm of static top ological
    phases. In this work\, we provide a general framework to under stand anomalous Floquet
    higher-order topological insulators (AFHOTIs)\, the classification of which has remained a
    challenging open question. In two dimensions (2D)\, such AFHOTIs are defined by their robust\,
    sym metry-protected corner modes pinned at special quasienergies\, even though all their
    Floquet bands feature trivial band topology. The corner-mode physics of an AFHOTI is found to
    be generically indicated by the 3D Dir ac/Weyl-like topological singularities living in the phase
    spectrum of the bulk time-evolution operator. Physically\, such a phase-band singularit y is
    essentially a ``footprint" of the topological quantum criticality that separates an AFHOTI from its
    high-frequency limit. Strikingly\, th ese phase-band singularities feature unconventional
    dispersion relation s that cannot be achieved on any static lattice in 3D\, which\, nevertheles s\,
    resemble the surface physics of 4D topological crystalline insulato rs. We establish the above
    higher-order bulk-boundary correspondence th rough a dimensional reduction technique\, which
    also allows for a syste matic classification of 2D AFHOTIs protected by point group symmetries.
    We demonstrate applications of our theory to two concrete models of AFHOTI s protected by C2
    and D4 symmetries\, respectively. Our work paves the way for a unified theory for classifying and
    characterizing Floquet top ological matters.
    Reference: Rui-Xing Zhang and Zhi-Cheng Yang\, in pre paration

    4:00 pm - Discussion LAST-MODIFIED:20201014T143336Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190918T180000Z DTEND:20190918T200000Z DTSTAMP:20260828T094430Z UID:4t6d480jtccq8m3i4oparhe2g8@google.com CREATED:20190724T145415Z DESCRIPTION:Speaker: Rouven Essig\, Stonybrook


    Precede d by lunch at 12:30pm

    Title:
    Direct Detection of sub-G eV Dark Matter: A New Frontier

    Abstract:
    Dark mat ter makes up 85% of the matter in our Universe\, but we have yet to learn i ts identity. While most experimental searches focus on Weakly Interacting M assive Particles (WIMPs) with masses above the proton (about 1 GeV/c^2)\, t he theoretical landscape of possible dark-matter candidates has expanded si gnificantly over the last decade\, to consider masses from 10^-22 eV/c^2 up to the Planck mass\, and even higher in the case of composite dark matter. A broad search program is therefore needed to maximize our chances of iden tifying dark matter.

    In this talk\, I will discuss the search fo r dark matter with masses between about 500 keV/c^2 to 1 GeV/c^2\, which ha s seen tremendous progress in the last few years. I will describe several d irect-detection strategies that can probe this under-explored mass range\, including searching for dark matter interactions with electrons in noble li quids\, semiconductors\, and scintillators\, as well as searching for inter actions with molecules to excite vibrational states. I will in particular h ighlight SENSEI\, a funded experiment that will use new ultra-low-threshold silicon CCD detectors (“Skipper CCDs”). I will describe the first results from SENSEI and show how SENSEI will probe vast new regions of parameter sp ace in the next few years. I will also mention how placing a Skipper-CCD on a satellite could probe strongly interacting sub-GeV dark matter. \; LAST-MODIFIED:20190913T205945Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Seminar with JHU TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200128T160000 DTEND;TZID=America/New_York:20200128T170000 DTSTAMP:20260828T094430Z UID:2i4hrbtj2kekvr5qqbg53f93dm@google.com RECURRENCE-ID;TZID=America/New_York:20200128T160000 CREATED:20190530T191015Z DESCRIPTION: \;Dr. Tammi Ginsberg\, the American Foundation for Suicide Prevention


    Title:&nbs p\;Talk Saves Lives: An Introduction to Suicide Prevention.


    S uicide is the 11th leading cause of death in Maryland. Tragically\, we have recently lost members of our physics community to suicide. Raising awarene ss is an important first step toward prevention.

    This community-bas ed presentation will cover the general scope of suicide\, the research on p revention\, and what people can do to fight suicide. Attendees will learn t he risk and warning signs of suicide\, and how together\, we can help preve nt it. \;


    LAST-MODIFIED:20200115T214532Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181011T230000Z DTEND:20181012T003000Z DTSTAMP:20260828T094430Z UID:49nb1ohd0ignb4gig7drpio0af@google.com CREATED:20180925T181342Z LAST-MODIFIED:20180925T181342Z LOCATION:Phys 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Induction TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181030T160000 DTEND;TZID=America/New_York:20181030T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181030T160000 CREATED:20180727T143919Z DESCRIPTION:Title: How forces modulate cellular dynamics: from the immune response to gene expression\n\n\nSpeaker: Arpita Upadhyaya\, University of Maryland\n\nCells need to sense and adaptively respond to their physical en vironment in diverse biological\ncontexts such as development\, cancer and the immune response. In addition to chemical\nsignals and the genetic bluep rint\, cellular function and dynamics are modulated by the physical\nproper ties of their environment such as stiffness and topography. In order to pro be and respond\nto these environmental attributes\, cells exert forces on t heir surroundings and generate\nappropriate biochemical and genetic respons es. These forces arise from the spatiotemporalorganization and dynamics of the cell cytoskeleton\, a network of entangled biopolymer filaments that is driven out of thermal equilibrium by enzymes that actively convert chemica l energy to mechanical energy. Understanding how cells generate forces and sense the mechanical environment (mechanosensing) is an important challenge with implications for physics and biology. We have investigated the princi ples of cellular force generation\, the statistical properties of these for ces\, and their role in stiffness and topography sensing by immune and canc er cells. We found that transmission of mechanical information from the ext ernal environment to biochemical networks inside the cell occurs by adaptiv e changes in the stability and mechanics of cytoskeletal networks. Using no vel imaging methods and physical models\, we have revealed that substrate s tiffness regulates gene expression by controlling the binding of proteins t o DNA. These results have implications for understanding how forces and mat erial properties of the environment are actively transmitted to the nucleus to control cell fate and how mechanosensing is impaired in diseases such a s cancer. Our work provides insight into the design principles underlying h ow biologically active matter controls signaling and gene expression and un derscores the importance of physical forces in cellular function. LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181130T180000Z DTEND:20181130T190000Z DTSTAMP:20260828T094430Z UID:741fns1gmkiglgg5pltgpmntuk@google.com CREATED:20180905T153528Z DESCRIPTION:Speaker: Avik Ghosh\, Professor of ECE and Physics\, Univers ity of Virginia

    Title: Emerging Materials\, Quantum Transport and Energy Efficient Computing: From Cool Science to Smart Technology< br>
    Abstract: As Moore's law draws to an end\, there is a lot of interest in knowing what comes next\, and how we could continue energy effi cient computing that capitalizes on novel materials discovery\, quantum evo lution of correlated electronic states\, or emerging brain inspired archite cture. Over the years\, we have developed the formal and computational tool s that allow us to couple predictive electronic structure methods with non- equilibrium quantum transport to address fundamental and practical limits t hat address industrial needs. Through various techniques such as optimized tight binding algorithms\, band unfolding at defects and interfaces\, self- energies designed to capture dephasing and inelastic scattering\, and many body Green’s functions for non-equilibrium correlations\, we have reached q uantitative understanding of novel phenomena in a number of emerging materi als\, such as skyrmions in magnetic films\, negative index in graphene PN j unctions\, excitations in quantum dots and spin filtering in topological in sulators.

    Armed with our quantitative understanding and in collabora tion with experimental colleagues\, we can now address several fundamental questions relevant to nanomaterials and devices

    1. Can we beat the s uperparamagnetic limit for ultrasmall nonvolatile memory using topologicall y protected magnetic states?

    2. Can we bypass the Boltzmann limit t hat constrains today's electronic logic?

    3. Can we exploit novel pr operties of graphene such as pseudospintronics to turn off its electrons wi thout compromising mobility?

    4. Can we design the ultimate thermal impedance matching network to minimize interfacial heat loss? LAST-MODIFIED:20181030T145507Z LOCATION:2108 Chem/Nuclear Engr. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201105T140000Z DTEND:20201105T143000Z DTSTAMP:20260828T094430Z UID:4t5r9kskqdbom912ic8e4noqpt@google.com CREATED:20200910T144930Z DESCRIPTION:
    ****STARTS AT 9:00 AM****
    Speaker:& nbsp\;Dai Aoki\, Tohoku Uni versity

    Title: Field induced phenomena and multiple superconducting phases in novel spin-triplet superconductor UTe2

    Abstract: \;
    We present our results on the novel spin-triplet superconductor UTe2 disco vered recently by S. Ran. UTe2 is a paramagnetic heavy fermion compound\, w hich might be located at the proximity of ferromagnetic order. The huge upp er critical field exceeding the Pauli limit is suggestive of the spin-tripl et state. For the field along b-axis\, the field reentrant superconductivit y is observed up to Hm~35T\, at which the first order metamagnetic transiti on occurs together with the enhancement of the effective mass. The field re entrant superconductivity in UTe2 is similar to those observed in ferromagn etic superconductors\, namely URhGe and UCoGe. Applying the pressure in UTe 2\, the superconducting transition temperature splits and the multiple supe rconducting phase is detected as a thermodynamic response. When the field i s applied along the easy a-axis\, Hc2 abruptly increases at low temperature and high field region\, as a consequence of multiple superconducting phase s with different order parameters. We overview the results on UTe2 comparin g with ferromagnetic superconductors\, and present our perspective. \;< br>

    Host: Nicholas P. Butch \;


    Link: \;h ttps://umd.zoom.us/j/91251230757?pwd=MkhFREJrUXNTekVZTTRGQ244 M1VBZz09
    Meeting ID: 912 5123 0757
    Password:  \; 558484 LAST-MODIFIED:20201030T111508Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Dai Aoki\, Tohoku University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190220T160000Z DTEND:20190220T170000Z DTSTAMP:20260828T094430Z UID:71rd1cudtk9h13v5qvlcrge5u2@google.com CREATED:20190124T135307Z DESCRIPTION:Speaker: Professor Sapna Sarupria\, Clemson University\n\nTitle : Freezing Water and Aqueous Solutions: Elucidating the Molecular Ballet Us ing Computer simulations\n\nAbstract: Nucleation – that is the onset of a n ew phase from a metastable phase – is a difficult phenomenon to study both experimentally and computationally. Nucleation relevant spatial and tempora l resolution is difficult to access in experiments. In contrast\, while com puter simulations are perfectly suited to probe these length and \ntimescal es\, sampling statistically relevant number of nucleation events is computa tionally expensive. In our research\, we use advanced sampling techniques i n conjunction with molecular dynamics simulations to sample hundreds and th ousands of nucleation events. We apply these methods to study heterogeneous ice nucleation and gas hydrate nucleation. \n\nGas hydrates are crystallin e (ice-like) solids formed by water forming cages around guest molecules su ch as methane\, carbon dioxide and tetrahydrofuran. These form at low tempe ratures and high pressure conditions and are a flow assurance problem in th e oil and gas industry. In addition\, hydrates can be potential energy sour ce\, and be used for gas separation and water desalination. The fundamental question that remains unanswered is -- how does the solution of guest and water transform into this crystalline solid. Our simulations provide insigh ts into the mechanisms of hydrate nucleation and highlight its dependence o n the water solubility of the guest molecules. These findings will facilita te design of promoters and inhibitors of gas hydrates. \n\nHeterogeneous ic e nucleation relates to freezing of water driven by the presence of an impu rity such as amineral surface. Interestingly\, it is not yet understood wha t about a surface promotes or inhibits the formation of ice. We use simulat ions of salt (silver iodide) and mineral (kaolinite) surfaces to provide in sights into the properties of a surface that facilitate ice formation. Thes e findings can help design surfaces that either inhibit ice nucleation (for example in cases such as wind mills\, power lines\, and transportation) or that promote ice nucleation (for example in cases such as food preservatio n and cryopreservation).\n \nCollectively\, my talk provides an overview of the intricate behavior of water molecules in transforming from liquid to t he solid phase\, and the simulation methods developed to reveal these behav iors. LAST-MODIFIED:20190213T151106Z LOCATION:Chemistry 0112 (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181119T210000Z DTEND:20181119T220000Z DTSTAMP:20260828T094430Z UID:4ftb3ndgcet9ark0gjrgfe0otj@google.com CREATED:20181015T150734Z DESCRIPTION:Title: The "Art of Possibility": Weighted Ensembles of Trajecto ries\n\nSpeaker: Lillian Chong\, University of Pittsburgh\n\nNotes: http:// www.marylandbiophysics.umd.edu/seminars/\n\nAbstract: The weighted ensemble (WE) path sampling strategy orchestrates quasi-independent parallel simula tions that are run with intermittent communication to enhance sampling of r are events such as large protein conformational transitions\, protein foldi ng\, and protein binding. Trajectories are pruned or replicated in a way th at encourages sampling of under-explored regions without biasing the dynami cs. The WE strategy has been demonstrated to be orders of magnitude more ef ficient than standard simulations in generating complete pathways and rate constants for rare events of numerous benchmark systems. I will present adv ances in both WE methodology and software that have enabled applications to complex processes such as protein-protein binding along with challenges th at remain. LAST-MODIFIED:20181015T150734Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181009T160000 DTEND;TZID=America/New_York:20181009T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181009T160000 CREATED:20180727T143919Z DESCRIPTION:Title: Occam's Razor\, Boltzmann's Brain\, and Wigner's Friend \n\nSpeaker: Charles H. Bennett\, IBM\n\nModern cosmology has revived inter est in some early 20th century puzzles that had seemed to be more in the re alm of unanswerable philosophy than science: the Boltzmann’s brain problem of whether we might be merely a rare statistical fluctuation in an old dead universe\, rather than inhabitants of a thriving young one\, and the Wigne r’s friend problem\, of what it feels like to be inside an unobserved quant um superposition. \n\n\nHosted by: Chris Jarzynski LAST-MODIFIED:20190530T190803Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200228T170000Z DTEND:20200228T174000Z DTSTAMP:20260828T094430Z UID:0219tsr2p1d2a2tarepugki8in@google.com CREATED:20200218T215037Z DESCRIPTION:Title: Quantum state characterization and state engineering usi ng photon-number-resolving measurements\nSpeaker: Rajveer Nehra\, Universit y of Virginia\, Charlottesville\, VA\n\n(pizza and drinks served at 12pm\; talk starts at 12:10pm) \n\nAbstract: We are in the midst of a second quan tum revolution fueled by the remarkable quantum mechanical properties of ph ysical systems. Therefore\, characterization and engineering of these quant um systems is vitally important in emerging quantum optical science and tec hnology. The Wigner quasi-probability distribution function provides such a characterization. First\, we present our recent results on quantum state t omography of a single-photon Fock state by photon-number-resolving (PNR) me asurements using superconducting transition-edge sensor [1].\nWe directly p robe the negativity of the Wigner function in our raw data without any infe rence or correction for decoherence\, which is also an important indicator of the “quantum-only” nature of a physical system. Next\, we introduce and experimentally demonstrate a state characterization protocol by measuring t he Wigner function overlap between the unknown state and a sufficiently lar ge set of readily available coherent state probes [2]. Unlike conventional continuous variable state tomography methods\, our method utilizes computat ionally efficient semi-definite programming and can be used to accurately r econstruct the state even after loss a known loss. The protocol is demonstr ated for a weak coherent state and a single-photon Fock state\, and is show n to be robust to experimental noise.\nTowards the end\, we discuss about o ngoing experiment for generating non-Gaussian states using a process known as photon catalysis which involves coherent states\, single-photon states\, linear optics\, and PNR measurements [3].\n\n[1] R. Nehra et al.\, Optica 6\,1356–1360 (2019). [2] R. Nehra et al.\, arXiv:1911.00173v1. [3] M. Eaton et al.\, N.J.Phys. 21\, 113034 (2019) LAST-MODIFIED:20200218T215037Z LOCATION:ATL 2324\, SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200406T200000Z DTEND:20200406T210000Z DTSTAMP:20260828T094430Z UID:04m08r7mis2di2krdr15f9vie6@google.com CREATED:20200319T181548Z DESCRIPTION:**This seminar will be conducted remotely via Zoom**

    https://umd.zoom.us/

    Yongchao Zhang\ , Washington University in St. Louis

    Title: Leptogenesis without exp licit loops

    Abstract: The baryon asymmetry is usually generated from the interference between tree and loop level diagrams in the literature. W e propose a novel mechanism for baryon asymmetry involving only tree-level diagrams. In particular\, a nonzero $CP$-asymmetry can be generated via at least two sets of interfering tree-level 2->\;2 or 1->\;N (N>\;=3) di agrams. To illustrate it\, we consider a simple scotogeneic-type-II seesaw extension of the Standard Model. The imaginary part for the required $CP$-a symmetry comes from the trilinear coupling of inert doublet scalar with the triplet scalar. In this model\, neutrino mass is generated by both scotoge nic and type-II seesaw contributions\, and the real part of the neutral com ponent of the inert-doublet serves as a cold dark matter candidate. The evo lutions of dark matter relic density and baryon asymmetry are intimately co nnected in this scenario. LAST-MODIFIED:20200331T154642Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20181016T171500Z DTEND:20181016T181500Z DTSTAMP:20260828T094430Z UID:1fkbslstf1knoulsg29qa1orkc@google.com CREATED:20180905T132401Z DESCRIPTION:Speaker: Suriyanarayanan Vaikuntanathan\, University of Chic ago

    Title: Dissipation Induced Transitions in Elastic Membran es and Mterials


    Abstract: Stochastic thermodyn amics provides a useful set of tools to analyze and constrain the behavior of far from equilibrium systems. However\, these tools have not yet been br oadly applied to aid in the control of materials assembled far from equilib rium. In this talk\, I will report an application of ideas from stochastic thermodynamics to the problem of membrane growth. Non-equilibrium forcing o f the membrane can cause it to buckle and undergo morphological transformat ions. I will show how ideas from stochastic thermodynamics\, in particular\ , a recent application to self-assembly\, can be used to phenomenologically describe and constrain morphological changes excited during a non-equilibr ium growth process. Biophysical implications of these results will also be discussed. \; LAST-MODIFIED:20181011T144515Z LOCATION:IPST 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200929T150000Z DTEND:20200929T160000Z DTSTAMP:20260828T094430Z UID:5dsj9s5i441lckbc3s5tsqtpjh@google.com CREATED:20200915T181731Z DESCRIPTION:
    Speaker: Subir Sachdev \;(Harvard University)


    Title: \;The strange quantum physics of t he high temperature superconductors

    Abstract: \;Numerous experiments have explored the phases of the cuprate high temperature superc onductors with increasing doping density p from the antiferromagnetic insul ator. There is now strong evidence that the small p region is a novel phase of matter\, often called the pseudogap metal\, separated from conventional Fermi liquid at larger p by a quantum phase transition. Symmetry-breaking orders play a spectator role\, at best\, at this quantum phase transition. I will describe trial wavefunctions across this metal-metal transition empl oying hidden layers of ancilla qubits. \; Quantum fluctuations are desc ribed by a gauge theory of ghost fermions that carry neither spin nor charg e. I will also \;describe a separate approach to this transition in a t -J model with random exchange interactions in the limit of large dimensions . This approach leads to a partly solvable SYK-like critical theory of holo ns and spinons\, and a linear in temperature resistivity from time reparame terization fluctuations. Near criticality\, both approaches have in common emergent fractionalized excitations\, and a significantly larger entropy th an naively expected.

    Host Danny Bulmash

    Email rcawthor@um d.edu for Zoom details \;
    LAST-MODIFIED:20200923T132847Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200305T123000 DTEND;TZID=America/New_York:20200305T133000 DTSTAMP:20260828T094430Z UID:12mo6ucdnfhqt29koq3ec8bmqc@google.com RECURRENCE-ID;TZID=America/New_York:20200305T123000 CREATED:20200109T211506Z DESCRIPTION:Title: The evolving science of your metabolism \nSpeaker: James Yorke\nUniversity of Maryland | Department of Mathematics and Department o f Physics\n\nAbstract: Each year recently I have given a talk about some im portant topic that is not one of my research areas. This lecture concerns i deas in the science of nutrition and metabolism that I feel most people sho uld know about. We seem to know more about planets circling other stars tha n about metabolism. And there are good reasons for that. LAST-MODIFIED:20200221T144625Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191025T170000Z DTEND:20191025T180000Z DTSTAMP:20260828T094430Z UID:04qdbqqrujokakajo8c0ok5gdo@google.com CREATED:20190905T133841Z DESCRIPTION:Speaker: TBD LAST-MODIFIED:20191016T130958Z LOCATION:2108 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190222T173000Z DTEND:20190222T183000Z DTSTAMP:20260828T094430Z UID:4pvohf6ijvu9sgmfh29gcr50vb@google.com CREATED:20190219T182651Z DESCRIPTION:Speaker:Hank Lamm\, UMD\n\nTitle: "Sign of the Times: Sign Prob lems in Modern Physics"\n\nAbstract: \n Quantum mechanics has allowed treme ndous progress in the theoretical understanding of our universe. One key t o this\, computational Monte Carlo techniques\, have succeeded for strongly -correlated materials and lattice QCD. Alas\, sign problems----when a samp ling distribution fails to be a well defined probability-- stymie these met hods in fermionic systems\, finite density\, and real-time quantum evolutio n. In this talk\, I discuss the origin of sign problems and the recent deve lopments in complexification and quantum computing that are helping to addr ess them. LAST-MODIFIED:20190221T171113Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190508T150000Z DTEND:20190508T160000Z DTSTAMP:20260828T094430Z UID:1n1gcihiokl1k5eqs9qm0psg1j@google.com CREATED:20190429T145521Z LAST-MODIFIED:20190429T145521Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190404T180000Z DTEND:20190404T193000Z DTSTAMP:20260828T094430Z UID:6m8hf2in0tqcldks5k4ocqg4km@google.com CREATED:20190130T185402Z DESCRIPTION:\nTitle: Learning Quantum Matter Data\, synthetic and real\, wi th AI\nSpeaker: Eun-Ah Kim\, Cornell\nAbstract: \nDecades of efforts in imp roving computing power and experimental instrumentation were driven by our desire to better understand the complex problem of quantum emergence. Howev er\, increasing volume and variety of data made available to us today prese nt new challenges. I will discuss how these challenges can be embraced and turned into opportunities by employing machine learning. Learning quantum e mergence with AI requires collective wisdom of applied math\, computer scie nce\, and condensed matter physics. I will discuss interpreting what machin e learned from synthetic data and gaining new insights and accelerating dis covery from experimental data.\nHost: Paglione LAST-MODIFIED:20190329T202831Z LOCATION:Room 1201 John S Toll Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium: Eun-Ah Kim\, Cornell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181113T160000 DTEND;TZID=America/New_York:20181113T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20181113T160000 CREATED:20180727T143919Z DESCRIPTION:Title: Emerging Phenomena at a Quantum Phase Transition: the M agnetic Field-Tuned Superconductor to Insulator Transition\n\nSpeaker: Ahar on Kapitulinik\, Stanford\n\nAbstract: The magnetic-field tuned supercondu ctor-to-insulator transition (H-SIT)\, along with the quantum-Hall liquid-t o- insulator transitions (QHIT) are paradigmatic quantum phase transitions and among the best experimentally studied ones. While evidence continue to mount to the fact that these two phenomena are in the same universality cla ss\, key results in the QHIT were not previously identified in the case of H-SIT. Tuning the disorder of two-dimensional superconducting films\, and s tudying the full resistivity tensor\, our results show a stark difference b etween films exhibiting weak vs. strong disorder. In weakly disordered film s\, the superconducting state gives way to an "anomalous metallic phase" wi th a resistivity that extrapolates to a non-zero value\, but with a vanishi ng Hall resistance. In the strong disorder limit a "true" H-SIT is observed \, characterized by an emerging self-duality at the H-SIT\, and the proxima te insulating phase is fundamentally distinct from a conventional "Anderson insulator" in that the Hall resistance\, rather than diverging\, tends to a finite value as the temperature approaches zero [1]. That these features are analogous to behaviors previously documented near the QHIT supports the existence of the correspondence between the two problems implied by the co mposite boson theory. \n\n[1] N.P. Breznay\, M.A. Steiner\, S.A. Kivelson\, A. Kapitulnik\, Proceedings of the National Academy of Sciences 113 (2016) \, 280.\nHosted by Brian Swingle/Victor Galitski LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20170410T110000 DTEND;TZID=America/New_York:20170410T120000 DTSTAMP:20260828T094430Z UID:v4a4i82m8gtpgie1tccflaa7uo@google.com RECURRENCE-ID;TZID=America/New_York:20170410T110000 CLASS:PUBLIC CREATED:20160620T170015Z DESCRIPTION:Speaker: Maciek Lewenstein\, ICFO\, Barcelona\n\nTitle: From e xotic lattices to detection of topological order and nonlocality: Recent pr ogress at ICFO.\n\nAbstract: I present a report on some of the recent activ ities in the Quantum Optics Theory group at ICFO. I will choose on demand a nd discuss few of the current projects of the group: from proximity effects in bilayer brick-square lattice\, through detection of Zak phase in quantu m random walk and detection of Chern numbers in Floquet topological bands\ , to detection of non-locality in 1D systems via measurements of energy\, a nd quantum Brownian motion revisited.\n\nReferences:\nTobias Grass\, Ravin dra W. Chhajlany\, Leticia Tarruell\, Vittorio Pellegrini\, and Maciej Lewe nstein\, Proximity effects in cold atom artificial graphene\, 2D Mater. 4\, 015039 (2017)\, arXiv:1608.02868.\nF. Cardano\, A. D'Errico\, A. Dauphin\ , M. Maffei\, B. Piccirillo\, C. de Lisio\, G. De Filippis\, V. Cataudella\ , E. Santamato\, L. Marrucci\, M. Lewenstein\, and P. Massignan\, Detection of Zak phases and topological invariants in a chiral photonic quantum walk \, in prinf in Nature Comm.\, arXiv:1610.06322\nA. Dauphin\, D.-T. Tran\, M . Lewenstein\, and N. Goldman\, Loading Ultracold Gases in Topological Floq uet Bands: Current and Center-of-Mass Responses\, submitted to 2D Mater.\, arXiv:1612.06432. \nJordi Tura\, Gemma De las Cuevas\, Remigiusz Augusiak\, Maciej Lewenstein\, Antonio Acín\, and J. Ignacio Cirac\, Energy as a dete ctor of nonlocality of many-body spin systems\, pending in Phys. Rev. X\, arXiv:1607.06090.\nAniello Lampo\, Soon Hoe Lim\, Jan Wehr\, Pietro Massign an\, and Maciej Lewenstein\, A Lindblad Model of Quantum Brownian Motion\, Phys. Rev. A 94\, 042123 (2016)\, arXiv:1604.0603.\n\n LAST-MODIFIED:20200108T224606Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20200417T170000Z DTEND:20200417T180000Z DTSTAMP:20260828T094430Z UID:7lbvmfu3l5pf2e6kdnq3qo1efv@google.com CREATED:20200122T135036Z DESCRIPTION:Speaker: TBA\n\nTitle: TBA\n\nAbstract: TBA LAST-MODIFIED:20200122T135036Z LOCATION:2110 Chem/Nuc Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191106T160000Z DTEND:20191106T170000Z DTSTAMP:20260828T094430Z UID:5o6h67tbtnmjd6su8s92ao9ar1@google.com CREATED:20190903T170510Z DESCRIPTION:Speaker: Alexander D. MacKerell\, Jr.\, University of Maryland\ , Baltimore\, MD\, Department of Pharmaceutical Sciences\, School of Pharma cy\n\nTitle: Development and Application of a Polarizable Force Field based on the Classical Drude Oscillator\n\nAbstract: The inclusion of the explic it treatment of electronic polarizability in empirical force fields offers the potential to significantly improve the accuracy of molecular simulation s of chemical\, biological and pharmacological systems in condensed phases. Towards this goal we have developed a polarizable force field based on th e classical Drude oscillator model. The Drude force field encompasses prot eins\, nucleic acids\, lipids\, carbohydrates and a limited range of drug-l ike molecules allowing for simulation studies of heterogeneous systems. An advantage of the Drude approach over other methods to model polarization i s the inclusion of an explicit particle to model the electronic degrees of freedom allowing for steric contributions associated with electronic polari zation to be modeled\, a capability that has been used in the Drude Mg2+ io n and halogen parameters. The utility of the model over the additive CHARMM 36 force field has been shown in the treatment of the cooperativity of heli x formation of the (AAQAA)3 peptide and in the unfolding of Amyloid peptide s\, on base flipping in DNA and on the interactions of ions with DNA. An overview of the model will be presented along with ongoing developments an d applications of the force field. LAST-MODIFIED:20191029T164736Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191122T180000Z DTEND:20191122T190000Z DTSTAMP:20260828T094430Z UID:5ave4qgm43hf9o9cf35outoudt@google.com CREATED:20190905T134426Z DESCRIPTION:Speaker: Nancy Dudney\, Corporate Fellow and Group Leader\, Phy sical Chemistry of Materials Group\, Materials Science and Technology Divis ion\, OakRidge National Laboratory\n\nTitle: Materials Science Investigatio ns to Advance Li-ion and Li Metal Batteries\n\nAbstract: Materials scientis ts are making important contributions to research and development efforts f ocused on advancing electrochemical energy storage technology. Lithium-ion batteries have improved greatly in recent years\, but there is continued m otivation to increase the specific and volumetric energy density\, reduce c ost\, provide for rapid recharge\, and the ensure safety of current and nex t generation batteries. Solid-state batteries may be one technology leadin g beyond current Li-ion designs. Several examples from the ORNL team progr ams will be presented\, illustrating where studies of mechanical properties \, fracture\, diffusion and creep\, and physical vapor synthesis of battery materials has contributed to new materials and architectures for rechargea ble batteries. LAST-MODIFIED:20191114T143418Z LOCATION:1116 Iribe Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20201016T160000Z DTEND:20201016T164500Z DTSTAMP:20260828T094430Z UID:25uv4606vd3q11h94j4hm1h99k@google.com CREATED:20201008T185559Z DESCRIPTION:Title: Implementing a fast\, unbounded quantum fanout gat e using power-law interactions
    Speaker: Andrew GuoTime : \;12 - 12:45pm\, Friday\, Oct. \;16

    Seminar will be held via Zoom: \;https://umd.zoom.us/j/97099328991&nb sp\;and Meeting ID : 970 9932 8991

    The standard circuit model for quantum computation presumes the ability to directly perform gat es between arbitrary pairs of qubits\, which is unlikely to be practical fo r large-scale experiments. Power-law interactions with strength decaying as 1/r^α in the distance r provide an experimentally realizable resource for information processing\, whilst still retaining long-range connectivity. We leverage the power of these interactions to  \;implement a fast quantu m fanout gate with an arbitrary number of targets. Our implementation allow s the quantum Fourier transform (QFT) and Shor’s algorithm to be performed on a D-dimensional lattice in time logarithmic in the number of qubits for interactions with α ≤ D. As a corollary\, we show that power-law systems wi th α ≤ D are difficult to simulate classically even for short times\, under a standard assumption that factoring is classically intractable. Complemen tarily\, we develop a technique to give a general lower bound\, linear in t he size of the system\, on the time required to implement the QFT and the f anout gate in systems that are constrained by a linear light cone. This all ows us to prove an asymptotically tighter lower bound for long-range system s than is possible with previously available techniques. LAST-MODIFIED:20201008T185559Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI/QuICS/CMTC Friday Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191002T180000Z DTEND:20191002T190000Z DTSTAMP:20260828T094430Z UID:706plmgn8l5fp3j2s4unmgt203@google.com CREATED:20190903T165935Z DESCRIPTION:Speaker: Himanshu Mishra\, KAUST\, Saudi Arabia\n\nTitle: Insec t Inspiration: Fundamentals to Technologies\n\nAbstract: In this seminar\, I will introduce the physics and chemistry of\nsuperhydrophobicity that ena bled five Halobates\, out of approx. 5.5 million\nextant species of insects \, to colonize the surface of the open ocean\, the\nlargest biome on Earth. On translating microtextures similar to the\nmushroom-shaped microtrichia on the legs of Halobates\, the conventional\nwisdom in wetting goes topsy-t urvy. I will present variations on these\narchitectures to pin-point their strengths and weaknesses. In the grand\nfinale\, I will unveil (i) the firs t-ever gas entrapping membranes (GEMs) for\ndesalination by membrane distil lation that do not require water-repellent\nmaterials/coatings1\, and (ii) gas entrapping microtextured surfaces (GEMS) \nthat robustly entrap air on immersion in polar and apolar liquids for drag reduction 2-4 and mitigating surface erosion from cavitation. LAST-MODIFIED:20190926T190001Z LOCATION:0112 Chemistry (Marker Seminar Room) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190506T110000 DTEND;TZID=America/New_York:20190506T120000 DTSTAMP:20260828T094430Z UID:1uhs7c0l51c4hq3kdbic37su98@google.com RECURRENCE-ID;TZID=America/New_York:20190506T110000 CREATED:20190122T184735Z DESCRIPTION:Title: A Universal Operator Growth Hypothesis\n\nSpeaker: Ehud Altman\, Berkeley\n\nAbstract: I will present a hypothesis for the universa l properties of operators evolving under Hamiltonian dynamics in many-body systems. The hypothesis\, can be simply stated as linear growth of recursio n coefficients produced in generating a Krylov basis from repeated applicat ions of the Liouvillian on the operator. The growth rate α --- observable t hrough properties of simple two point correlation functions --- governs th e exponential growth of operator complexity in a sense I will make precise. Furthermore\, I will show that α places a sharp bound on Lyapunov exponent s λ≤2α\, which generalizes the known universal low-temperature bound λ≤2πT. We illustrate our results in paradigmatic examples such as non-integrable quantum spin chains\, the Sachdev-Ye-Kitaev model\, and classical models. F inally we use the hypothesis in conjunction with the recursion method to de velop a technique for computing diffusion constants in strongly coupled sys tems. LAST-MODIFIED:20190502T132747Z LOCATION:Atlantic 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20191108T170000Z DTEND:20191108T173000Z DTSTAMP:20260828T094430Z UID:0ik6mnnb7f7dliukq2b3iooing@google.com CREATED:20191031T203730Z DESCRIPTION:Title: Time-domain order-by-disorder transition in a Harper-Hof stadter system\n\nSpeaker: Qiyu Liang\n\n12:10-12:40pm\n(pizza and drinks s erved 10 min. before talk)\n\nAbstract: The Harper-Hofstadter model describ es particles in two-dimensional (2D) lattices subjected to a uniform magnet ic field. Ultracold atomic gases in optical lattices are an ideal platform to study this model\, thanks to their capability for realizing large and tu nable magnetic fluxes per lattice plaquette. We experimentally assembled su ch a 2D lattice rolled into a long tube\, just 3-site around\, thereby real izing periodic boundary conditions. These three sites were constructed from a synthetic dimension built from the atoms’ internal degrees of freedom. W e inserted an additional longitudinal flux through the long axis of the cyl inder\, a process which has no analogy in a planar geometry. We observe a t ime-domain order-by-disorder transition: When the transverse flux is a simp le rational number (2/3 in our experiments)\, the system’s unitary evolutio n is exquisitely sensitive to the longitudinal flux and becomes incoherent when all values of the longitudinal flux are sampled. Remarkably\, away fro m simple rational fractions\, the temporal order is restored. We explain th at this transition can be understood equivalently in terms of a spatial sel f-averaging effect or interference between different matter-wave momentum s tates. LAST-MODIFIED:20191108T170454Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200224T203000Z DTEND:20200224T213000Z DTSTAMP:20260828T094430Z UID:3ch6ocs0ur4mu2a85aeqtik10p@google.com CREATED:20200218T192649Z DESCRIPTION:Title : Accelerating Particles via Magnetized Turbulence and Ma gnetic Reconnection\nSpeaker Name: Luca Comisso\nSpeaker Institution : Colu mbia University\n\n\nAbstract : In 1949\, Enrico Fermi proposed that intera ctions of charged particles with randomly-moving magnetized clouds could ex plain the origin of the highest-energy particles in the Universe. Yet\, the details of the\nmechanisms underlying the particle energization have escap ed our understanding for 70 years. Among the different processes\, magnetiz ed turbulence and magnetic reconnection have been often invoked to explain the generation of the high-energy particles and the associated non-thermal emission that is routinely observed from a wide variety of\nastrophysical s ources. In this talk\, I will present recent developments on this front. I will show that a natural consequence of the magnetized turbulent cascade is the generation of reconnecting current sheets\, which cooperate with large scale turbulent fluctuations to accelerate particles. Magnetic reconnectio n controls the physics of particle injection from the thermal pool\, while the large scale turbulent fluctuations drive particles up to the highest en ergies allowed by the\nscale of the system. This two-stage acceleration pro cess leaves an imprint on the particle pitch-angle distribution\, which has important\nimplications for understanding the synchrotron spectra from ast rophysical sources. One such implication for the hard radio spectrum of the Crab Nebula will be discussed. \n\n\nHosted by: John Cullinan LAST-MODIFIED:20200219T150039Z LOCATION:1136 Physical Sciences Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190506T200000Z DTEND:20190506T210000Z DTSTAMP:20260828T094430Z UID:7p3gp12savlhd55q967vg88k89@google.com CREATED:20190118T171645Z DESCRIPTION:Title: Force-dependent extracellular matrix remodeling in the t umor microenvironment alters exosome diffusion and induces CAF phenotypes\n \nSpeaker: Yun Chen\, Johns Hopkins University\n\nNotes: http://marylandbio physics.umd.edu/seminars/\n\nAbstract: Carcinoma-associated fibroblasts (CA Fs) can be detected during early stages of cancer development in tumor stro ma. CAFs are often associated with high-grade malignancies of poor prognosi s in breast cancer and other squamous cell carcinomas by secreting cytokine s promoting cancer cells to replicate\, metastasize and resist apoptosis. U nderstanding the mechanisms by which normal stroma-dwelling cells transform to CAFs might inspire strategies to suppress CAF induction and improve pro gnosis. Normal fibroblasts (NFs) in stroma can be induced to CAFs by exosom es containing microRNA and cytokines\, which are secreted by cancer cells. However\, it is not clear how these CAF-inducing factors secreted by cancer cells can reach stromal NFs on the other side of the basement membrane (BM ) in vivo: At the early stages of breast cancer\, cancer cells do not exhib it high expression of metalloproteases (MMPs) to digest extracellular matri x (ECM)\, which imposes a diffusion barrier for CAF-inducing factors to rea ch stroma. Microscopically\, the diffusion barrier is formed by the laminin /fibronectin fibrils in the BM and collagen fibrils in the stroma. Moreover \, at early stages cancer cells are not yet metastatic and cannot migrate i nto the proximity of stromal NFs. Despite the lack of physical proximity and low MMP secretion\, we observed a series of force-dependent events init iated by cancer cells which might enable CAF induction. First\, cancer cel ls use the strong forces to mechanically remodel the ECM fibril organizatio n in the tumor microenvironment to enhance the diffusion of CAF-inducing fa ctors. Second\, cancer cells exert the forces to directly activate mechanos ignaling pathways in the stromal fibroblasts to induce CAF phenotypes. In p articular\, we observed that the diffusion rate of CAF-inducing factors cor relates with the degree of ECM fibril alignment\, and is important in CAF i nduction. We found that it is early-stage breast cancer cells which align t he ECM fibrils so that the diffusion rate is increased. Furthermore\, we ob served that ECM remodeling was associated with long-range (>1000 μm) mechan ical forces collectively generated by epithelial spheroids. Overall\, we co nclude that cancer cells of epithelial origin can facilitate CAF induction\ , through long-range mechanical forces\, by decreasing diffusion barrier ac ross BM. LAST-MODIFIED:20190426T123308Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190911T150000Z DTEND:20190911T203000Z DTSTAMP:20260828T094430Z UID:5rgoo6ekp2mbsnk6rkr7chqkpj@google.com CREATED:20190909T182758Z DESCRIPTION:11:00am Maissam Barkeshli\, "Anomalies and symmetry enriched t opological phases of matter"
    11:40am \; Yang-Zhi Chou\, "Superconduc tor versus insulator in twisted bilayer graphene"
    12:20pm Seongjin Ahn\ , "Linear optical response of nodal line semimetals"

    1:00-2:30 \ ; Break

    2:30pm Sheng-Jie Huang\, "Crystalline symmetry protected to pological phases"
    3:10pm \; Shao-Kai Jian\, "Unconventional transiti ons in generalized SYK model"
    3:50pm Christopher White\, "Simulating la rge spin chains with matrix product density operators"


    Condensed Matter Theory Center website:
    http://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20190910T154738Z LOCATION:4402 Atlantic Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Fall Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190429T200000Z DTEND:20190429T210000Z DTSTAMP:20260828T094430Z UID:5ehifiitvelm9qo59hrpb0d8cu@google.com CREATED:20190118T170635Z DESCRIPTION:Title: Crowding\, Clustering\, and Phase Transitions in Crowded Cellular Environments\n\nSpeaker: Michael Feig\, Michigan State University \n\nNotes: http://marylandbiophysics.umd.edu/seminars/\n\nAbstract: \n\nBio logical macromolecules function in dense\, crowded cellular environments. E arly studies of crowding effects have emphasized volume exclusion effects\, but it is becoming clear that frequent non-specific interactions between p roteins\, nucleic acids\, and metabolites may be the more important factor in modulating the structure and dynamics of biomolecules. Computer simulati on studies at different scales of a series of models ranging from concentra ted homogeneous protein solutions to models of bacterial cytoplasms are pre sented to explore the effects of non-specific quinary protein-protein inter actions on protein stability and dynamics. One focus is on the formation o f transient clusters that determine diffusive properties and lead to liquid -liquid phase transitions. The computational results are related to existin g experimental data and the challenges and opportunities to expand the curr ent studies to whole-cell modeling in molecular detail are discussed. LAST-MODIFIED:20190118T171316Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20181108T123000 DTEND;TZID=America/New_York:20181108T133000 DTSTAMP:20260828T094430Z UID:4uk6sho6vq71qfeu6pjoc0b4vm@google.com RECURRENCE-ID;TZID=America/New_York:20181108T123000 CREATED:20180827T142930Z DESCRIPTION:Title: Modeling methodologies for personal protection control s trategies in vector-borne disease epidemiology: The role of diversity ampli fication\nSpeaker: Dr. Jeff Demers\nUniversity of Maryland | Department of Biology\n\nAbstract: Personal Protection measures\, such as bed nets and pe rsonal repellents\, are important tools for the suppression of vector-borne diseases like malaria and Zika\, and the ability of health agencies to dis tribute protection and encourage its use plays an important role in the eff icacy of community-wide disease management strategies. Recent modeling stud ies have shown that a counterintuitive diversity-driven amplification in co mmunity-wide disease levels can result from a population's partial adoption of personal protection measures\, potentially to the detriment of disease management efforts. This finding\, however\, may overestimate the negative impact of partial personal protection as a result of implicit restrictive m odel assumptions regarding host compliance\, access to\, and longevity of p rotection measures. We establish a new modeling methodology for incorporati ng community-wide personal protection distribution programs in vector-borne disease systems which flexibly accounts for compliance\, access\, longevit y\, and control strategies by way of a flow between protected and unprotect ed populations. Our methodology yields large reductions in the severity and occurrence of amplification effects as compared to existing models. LAST-MODIFIED:20181031T165417Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20190507T160000 DTEND;TZID=America/New_York:20190507T170000 DTSTAMP:20260828T094430Z UID:66gep5q6insg54utbvrl7270a1@google.com RECURRENCE-ID;TZID=America/New_York:20190507T160000 CREATED:20180727T143919Z DESCRIPTION:Speaker: Santo Fortunato\, Indiana University\n\nTitle: Science of Science\n\n\nAbstract: Science of science is the study of the activity of science makers\, via their production\, citation\, collaboration\, fundi ng\, and mobility patterns. Here I will present findings on citation dynami cs and productivity. The distribution of the number of citations of papers published in the same year and discipline follows a universal curve\, if th e number of citations is properly rescaled. This allows for unbiased compar isons of the citation-based impact of works in different disciplines. I wil l introduce key mechanisms behind citation dynamics\, like preferential att achment and knowledge obsolescence\, and show that scientific reputation ca n artificially boost the impact of a work. The exponential growth of scient ific output has two major consequences (among others): papers are forgotten faster and faster and there is citation inflation\, i.e. the value of a ci tation decreases in time.\nFinally I will prove that you will never get the Nobel Prize\, sadly.\n\n\nHost: Victor Yakovenko LAST-MODIFIED:20190530T190803Z LOCATION:Physical Sciences Complex Lobby\, 4296 Stadium Dr\, College Park\, MD 20742 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20190313T200000Z DTEND:20190313T213000Z DTSTAMP:20260828T094430Z UID:6cooldd5g2k43o1n0j8n3rkno1@google.com CREATED:20190308T155542Z DESCRIPTION:Title : "Is There Life After Physics?"\nSpeaker Name: Gordon Lo ng\nSpeaker Institution : MITRE Corporation\nAbstract : "A former physicist 's perspective on the cultures of the public and private sector\, from gove rnment to military to Silicon Valley." LAST-MODIFIED:20190308T155542Z LOCATION:3150 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200210T110000 DTEND;TZID=America/New_York:20200210T120000 DTSTAMP:20260828T094430Z UID:2gucq1hi0cslsst5eq64g7rps0@google.com RECURRENCE-ID;TZID=America/New_York:20200210T110000 CREATED:20191125T175528Z DESCRIPTION:Title: \; \;New perspectives on quantum matter: b ringing together quantum simulations and machine learning


    Speaker: Eugene Demler\, Harvard

    Abstract: \;This talk will review applications of quantum simulators that make use of machine learnin g techniques. Snapshots of many-body states obtained from quantum gas micro scopes can be used to perform hypothesis testing using convolutional neural networks. The application of this technique to the Fermi Hubbard model has demonstrated that geometrical string model provides a better description o f the experimental data than the pi-flux RVB model. I will also discuss the idea of combing quantum simulators with machine learning to perform infere nce of NMR spectra for small biological molecules. \;


     \; \; \;Host: Jay Sau LAST-MODIFIED:20200331T221655Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200819T173000Z DTEND:20200819T180000Z DTSTAMP:20260828T094430Z UID:5lkve87v3s8lti3u8daraq1qc6@google.com CREATED:20200810T170919Z DESCRIPTION:

    REGISTER HERE: https://virtualscienceforum.org/#/long _range_colloquium?id=mohammad-hafezi-university-of-maryland-and-jqi

    Mohammad Hafezi\, Unive rsity of Maryland and JQI

    19 August 2020\, 1:30 PM ET (19 :30 CEST)

    Quan tum optics meets correlated electrons

    One of the key chal lenges in the development of quantum technologies is the control of light-m atter interaction at the quantum level where individual excitations matter. During the past couple of decades\, there has been tremendous progress in controlling individual photons and other excitations such as spin\, exciton ic\, phononic in solid-state systems. Such efforts have been motivated to d evelop quantum technologies such as quantum memories\, quantum transducers\ , quantum networks\, and quantum sensing. While these efforts have been mai nly focused on control and manipulation of individual excitations (i.e.\, s ingle-particle physics)\, both desired and undesired many-body effects have become important. Therefore\, it is intriguing to explore whether these q uantum optical control techniques could pave a radically new avenue to prep are\, manipulate\, and detect non-local and correlated electronic states\, such as topological ones.

    We present several examples of such ideas: (1) Optically driven fractional quantum Hall states: While in Floquet band engineering\, the focus is on the control of the single-particle Hamiltonia n\, here the optical drive can effectively engineer the interaction terms\, which could lead to the preparation of model Hamiltonians and exotic topol ogical states. (2) Enhancing superconductivity with an optical drive: we pr opose a new approach for the enhancement of superconductivity by the target ed destruction of the competing charge/bond density waves (BDW) order. By i nvestigating the optical coupling of gapless\, collective fluctuations of t he BDWs\, we argue that the resonant excitation of these modes can melt the underlying BDW order parameter. We propose an experimental setup to implem ent such an optical coupling using 2D plasmon-polariton hybrid systems. (3) We also discuss how the coupling of an empty cavity can enhance the superc onducting transition temperature\, in a quantum analogy to the Eliasberg ef fect. In the end\, we discuss how by driving a semi-conductor and creating a population inversion\, one could achieve s-wave and p-wave superconductin g pairing.

    References:

    • Fractional Quantum Hall States:
      • Physical Review Letters\, 119\, 247403 (2017)
      • Physical Review B \, 98\, 155124 (2018)
      • arXiv:2005.13569 (2020)
    • Sup erconductivity:
      • Phys. Rev. Lett.\, 122 \, 167002 (2019)
      • Phys . Rev. B\, 101\, 224506 (2020)
    LAST-MODIFIED:20200810T170919Z LOCATION:online\; see link below SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mohammad Hafezi on Quantum Optics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210412T160000 DTEND;TZID=America/New_York:20210412T170000 DTSTAMP:20260828T094430Z UID:303hccg6b1atvum48cq5pd58hn@google.com RECURRENCE-ID;TZID=America/New_York:20210412T160000 CREATED:20210111T154105Z DESCRIPTION:Speaker: Victor Gorbenko\, Stanford

    Title: New Tools for Fundamental Cosmology

    Abstract: In the first part of this talk I wi ll discuss a framework for calculating correlation functions of primordial inflationary perturbations which makes available powerful tools developed i n the studies of Anti-de Sitter space and conformal field theories. This fr amework allows to perform practical perturbative calculations\, as well as reveals important general properties of these cosmological observables that follow from locality and unitarity. In the second part\, I will discuss no n-perturbative gravitational effects which can be effectively described by spacetime connections between ``bra'' and ``ket'' of a wave function of the universe. In some models\, these effects can produce the dominant contribu tion to inflationary correlators\, violating a naive effective field theory intuition\, in analogy with the non-perturbative effects altering the spac etime picture of an old evaporating black hole. A virtue of such effects in the cosmological setting is that they can potentially have phenomenologica lly relevant consequences.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210412T124458Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210309T181500Z DTEND:20210309T191500Z DTSTAMP:20260828T094430Z UID:79pauq4a3jnni4cnsns4dqk18b@google.com CREATED:20210202T175934Z DESCRIPTION:Speaker: Dr. Gregory Schenter\, Pacific Northwest National Labo ratory

    Title: Rare Events: Past\, Present\, Future

    Abstract: I will describe efforts to understand rare event processes of ions in solut ion. We employ a range of theoretical techniques comparing full atomistic m olecular dynamics simulation for generation of ensembles and dynamic respon se to reduced models of a Generalized Langevin Equation form. \; We exp lore alternatives to conventional distance reaction coordinates such as ele ctric fields\, coordination numbers\, Google Page Rank\, and vibrational fr equencies. \; Extensions of concepts invoked in Marcus theory will be d escribed. Such analysis provides a framework for enhancing understanding of phenomena in response to inhomogeneities\, coupling of multiple time scale s\, and energy transfer. Such techniques show promise for elucidating rare- event kinetics in complex systems.

    This work was sup ported by U.S. Department of Energy’s (DOE) Office of Basic Energy Sciences \, Division of Chemical Sciences\, Geosciences\, and Biosciences.

    Sol vent reaction coordinate for an SN2 reaction

    C Leitold\ , CJ Mundy\, MD Baer\, GK Schenter\, B Peters

    The Journ al of Chemical Physics 153 (2)\, 024103

     \;< /p>

    Resolving Heterogeneous Dynamics of Excess Protons in Aqueous Solutio n with Rate Theory

    S Roy\, GK Schenter\, JA Napoli\, MD Baer\, TE Markland\, CJ Mundy

    The Journal of Physical Chemistry B \; \; \; \; \; \; \; \; \; 2 \; \; \; \; \; \; \; \; \; \;&nbs p\; \; \; 2020

     \;

    Rate theory of ion pairing at the water liquid–vapor interface: A case of sodiu m iodide

    LX Dang\, GK Schenter

    The Journal of chemical physics 148 (22)\, 222820

    &n bsp\;

    On the relation between Marcus theory and ultrafast spec troscopy of solvation kinetics

    S Roy\, M Galib\, GK Sch enter\, CJ Mundy

    Chemical Physics Letters 692\, 407-415

    LAST-MODIFIED:20210302T185736Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210414T150000Z DTEND:20210414T161500Z DTSTAMP:20260828T094430Z UID:1eqtbcgth0nijl2dql6uhpnh02@google.com CREATED:20210412T163656Z DESCRIPTION:Speaker: Sisi Zhou (Yale University)\nTime: Wednesday\, April 1 4\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/98936 76372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\nQuantum metrology\, which studi es parameter estimation in quantum systems\, has many important application s in science and technology\, ranging from frequency spectroscopy to gravit ational wave detection. Quantum mechanics imposes a fundamental limit on th e estimation precision\, called the Heisenberg limit\, which is achievable in noiseless quantum systems\, but is in general not for noisy systems. Thi s talk is a summary of some recent works by the speaker and collaborators o n quantum metrology enhanced by quantum error correction. Specifically\, we present a necessary and sufficient condition for achieving the Heisenberg limit in noisy quantum systems. When the condition is satisfied\, the Heise nberg limit is recovered by a quantum error correction protocol which corre cts all noises while maintaining the signal\; when it is violated\, we show the estimation limit still in general has a constant factor improvement ov er classical strategies\, and is achievable using approximate quantum error correction. Both error correction protocols can be optimized using semidef inite programs. Examples in some typical noisy systems will be provided.\nJ oin Zoom Meeting\nhttps://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdT MjkzTllvQT09\npasscode: abc123 \nJoin by phone (US) +1 253-215-8782 (pas scode: 578842) \nJoin using SIP 9893676372@zoomcrc.com (passcode: 578842 ) LAST-MODIFIED:20210412T163656Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210420T160000 DTEND;TZID=America/New_York:20210420T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210420T160000 CREATED:20200116T204737Z DESCRIPTION:

    ZOOM Recording: https://umd.hosted.panopto.com/Panopt o/Pages/Viewer.aspx?id=a8babc64-a0db-4f20-83ae-ad1001634de7

    Join Zoom Meeting

    https://umd.zoom.us/j/98778035497?pwd=eEFXbDlqNFUx MFFxR0Q1MUx4TUhvZz09

    Meeting ID: 987 7803 5497

    Passcode : 634184

    Host: Dr. Charles Clark

    Speaker: Dr. William Ratcliff< /p>

    Title: “Investigations of the first intrinsic topological insulator: MnBi2Te4”

    Abstract: In this talk\, I discuss our recent results on the first intrinsic antiferromagnetic topological insula tor\, MnBi2Te4. In this Van der Waals material\, we can control the magneti c state through chemical substitution\, as well as through the application of a magnetic field. \; These knobs allow us to effect the topology of the band structure and thus the transport. \; We apply a number of prob es\, including transport\, susceptibility\, neutron scattering\, ARPES\, an d TEM to determine the physics of this exciting material [1\,2].

    < /u>

    "Spin Scattering and noncollinear spin-structure induced i ntrinsic anomalous Hall Effect in antiferromagnetic topological insulator M nnBi2Te4\, Seng Huat Lee et al\, Phys. Rev. Research 1\, 012011 (2019)

    < p>

    "Ferromagnetism in van der Walls compound MnSb1.8Bi.2Te4" Y angyang Chen et al\, Phys. Rev. Matt. 4\, 064411 (2020)

    LAST-MODIFIED:20220120T142431Z LOCATION:Virtual SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210423T170000Z DTEND:20210423T180000Z DTSTAMP:20260828T094430Z UID:1vht0nq2kjs0tu86f3kafdmb47@google.com CREATED:20210202T141533Z DESCRIPTION:Speaker: \; Nicholas C.M. Fuller\, Ph.D.\, IBM Research Div ision

    Title: \; \;Career Navigation: What are the Signals to which One Should Pay Attention?

    Abstract: \; Society has born w itness to a plethora of benefits from six decades of advancement in science and technology fueled in part by the 1960s space race. Representative exam ples of this include: (i) Moore's Law\, establishing the foundation and dri ving the ubiquitous nature of all computing omnipresent in enterprises and our personal lives alike\; (ii) Metcalf's law\, characterizing a digitally connected world and lastly (iii) advancement in software programming models \, computing runtimes and virtualization technologies all of which have giv en rise to cloud computing becoming mainstream. More recently\, we have wit nessed major progress in specific computing accelerators (graphical process ing units in particular) and deep learning giving rise to major progress in the emerged computer science paradigm of artificial intelligence (Al). The combined benefit of these are no more vivid to society as they are today i n a world severely afflicted by the COVID-19 pandemic wherein distance lear ning\, video-conferencing\, and e-commerce through shared economy platforms are all made commonplace. From an enterprise point of view\, the rapid gro wth of cloud and Al have accelerated companies use of technology for commun ications\, supply chain and automation of the management of their mission c ritical applications.

    In this talk\, I will share how I have participated in some of these technological advancements during the past 20 years. Init ially as a physicist specializing in probing the interactions of processing plasmas with novel materials and subsequently as a technologist delivering semiconductor processing technologies for the fabrication of advanced CMOS devices. As opportunities emerged and interests in other domains grew\, I made the transition to software development for the emerging areas of cloud and Al. These transitions have culminated in my current role as an executi ve responsible for the delivery of Al - based technologies for the manageme nt of mission critical enterprise applications. The circumstances influenci ng the above career trajectory and other pointers for career navigation wil l also be discussed. \;

    Zoom Meeting ID: 953 7308 1627 \;& nbsp\;

    Passcode: 555444

    https://umd.zoom.us/j/ 95373081627?pwd=WGYvNWpXWnY2aGs5c3ppWWVWbkdOdz09



    < /p> LAST-MODIFIED:20210413T213943Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220214T213000Z DTEND:20220214T223000Z DTSTAMP:20260828T094430Z UID:69jb13qfd1h1htj51v9hq3v02i@google.com CREATED:20220121T200337Z DESCRIPTION:Title: Searches for Other Spacetime Sirens

    Speaker: Peter Shawhan\, UMD Department of Physics

    Abstract: Co mpact binary mergers are the only type of gravitational wave signal that ha ve been directly detected so far. While that has enabled spectacular discov eries -- and even a measurement of the Hubble constant from the "standard s iren" property of a binary merger -- the data from LIGO and Virgo is also b eing searched for other types of signals. In this talk I would like to focu s attention on searches for continuous-wave gravitational waves\, which wou ld be emitted by a rapidly rotating neutron star that is not quite axisymme tric. These searches can take advantage of integrating over long data sets\ , but only if Doppler shifts and amplitude modulation of the continuously e mitted "siren" are properly taken into account. The potentially huge comput ational demands of doing that have led to the development of different stra tegies for different science targets. I will describe the astrophysical sou rces\, the data analysis methods\, and several search results which have re cently been released.

    Notes: \;Join the meeting at 4:15 for meet and greet
    Visit \;ht tps://bit.ly/2PmJoT6 \;for access
     LAST-MODIFIED:20220129T163222Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220328T160000 DTEND;TZID=America/New_York:20220328T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220328T160000 CREATED:20220131T204640Z DESCRIPTION:

    Title: Quasiparticle Tunneling Suppression in Gap-Engineered Transmons


    Abstract: For many superconducting qubits\, non-equili brium quasiparticles tunneling across the Josephson junction is suspected t o be one of the dominant sources of energy relaxation. This loss mechanism is expected to be suppressed \;in devices with junctions that are made from electrodes with sufficiently different superconducting gaps [1]. We ha ve designed and fabricated an asymmetric Al/AlOx/Al/Ti transmon coupled to a 3D Al cavity. To do this\, we deposited one pure Al electrode\, oxidized it\, and then deposited an Al/Ti bilayer as the counter-electrode. This pro cess forms a standard AlOx tunnel barrier\, but gives a ~100 μeV difference in superconducting gaps due to the Ti proximitizing the Al of the top laye r. Fabrication of these devices\, Giaever tunneling measurements of the sma ll Al/AlOx/Al/Ti junction\, as well as coherence measurements of the device will be discussed.

    [1] Zhang\, PhD Thesis DOI: 10.13016/c516-gizd ( 2020)




    In-Person Location: Toll P hysics Room # 1201
    Time: 4pm -5:30pm LAST-MODIFIED:20220324T163618Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Zachary Steffen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210429T180000Z DTEND:20210429T193000Z DTSTAMP:20260828T094430Z UID:55bnq980objvoni1qkkaak789b@google.com CREATED:20210426T145949Z DESCRIPTION:Speaker: Cheng Gong\, UMD

    Department of Electrical and ComputerEngineering\, University of Maryland\, College Park

    < /b>

    2D Magnets and 2D Magnetism

    Magnetism\,one of th e most fundamental physical properties\, has revolutionized significant tec hnologies such as data storage and biomedical imaging\, and continues to br ing forth new phenomena in emerging materials of reduced dimensionalities.T he recently discovered magnetic 2D van der Waals materials provide ideal pl atforms to enable the atomic-thin\, flexible\, lightweight magneto-optical and magnetoelectric devices. Though many have hoped that the ultra-thinness of 2Dmagnets should allow an efficient control of magnetism\, the state-of -the-art has not achieved notable breakthroughs to this end. In this talk\, I will speak on our experimental discovery of the first 2D ferromagnet\, a nd discuss our recent progress in the efficient electrical and optical cont rol of 2D magnetism.

    Host: Anlage

    Link: \;https:/ /umd.zoom.us/j/91251230757?pwd=MkhFREJrUXNTekVZTTRGQ244M1VBZz 09

    Meeting ID: \;912 5123 0757
    Pa ssword: \; \; 558484

    LAST-MODIFIED:20210426T165722Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T203000Z DTEND:20220303T213000Z DTSTAMP:20260828T094430Z UID:12rppk7gefiblf99vo5gud6mnb@google.com CREATED:20220228T152329Z DESCRIPTION:Live at ESJ or via Zoom: UMIACS’ Rita Colwell on "Just Because You Are A Pawn You Don't Have To Lose The Game." \;https://go.umd.edu/colwell22 \; LAST-MODIFIED:20220228T152435Z LOCATION:Live at ESJ or via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Dean’s Voices of Inclusive Excellence Lecture TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210312T190000Z DTEND:20210312T200000Z DTSTAMP:20260828T094430Z UID:25p4pn2e5rnjk4u52kt7h9ddi8@google.com CREATED:20210201T192517Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Maxwell Hansen\, U Edinburgh

    Title: Multi-hadron obse rvables from spectral functions

    Abstract: Numerical lattice calculat ions provide a powerful method for systematically estimating finite-volume Euclidean correlators. To connect to physical observables\, one must analyz e the role of the Euclidean signature and finite volume\, as well as other systematic effects. In this seminar\, I will discuss recent work on interpr eting multi-hadron observables as spectral functions\, given by inverting t he Laplace transform on a particular lattice correlator. I will describe me thods for regulating this notoriously ill-posed problem by targeting a smea red spectral function. This “smearing" turns out to be of great physical im portance\, e.g. for defining the infinite-volume limit and for implementing the required i-epsilon pole prescription. I will further discuss how this can be understood as an extension of the famous work of Maiani and Testa on Euclidean correlators. These methods are expected to be most relevant in q uantities with many hadronic intermediate states including long distance co ntributions to heavy meson mixing and decays. LAST-MODIFIED:20210308T134659Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211122T200000Z DTEND:20211122T213000Z DTSTAMP:20260828T094430Z UID:3o2u8eu40kaj1is3q66agg1sdj@google.com CREATED:20211108T163338Z DESCRIPTION:Speaker: Christophe Grojean\, DESY\n\nTitle: “The BSM orders of CPV”\n\nAbstract: As SMEFT is a framework of growing importance to analyze high-energy data\, understanding its parameter space is crucial. The latte r is commonly split in CP-even and CP-odd parts\, but this classification i s obscured by the fact that CP-violation is actually a collective effect th at is best captured by considering flavor-invariant combinations of La- gra ngian parameters. I’ll present the 699 flavour invariants that describe CP violation effects in leading order in the SM effective field theory\, showi ng in particular that the breaking of CP is accidentally small in the SM. LAST-MODIFIED:20211108T163338Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220425T203000Z DTEND:20220425T213000Z DTSTAMP:20260828T094430Z UID:65ah7s18gb0853osftm2q8oahu@google.com CREATED:20220329T231830Z DESCRIPTION:Title: \;Geomagnetic Storms and Space Hazards: Significance of Meso-scale Structures in Ionosphere-Thermosphere System

    Speaker: Yue Deng\, University of Texas at Arlington

    Abstract: Space environ ment includes Sun\, Solar wind (a.k.a. heliosphere)\, magnetosphere and ion osphere-thermosphere (a.k.a. upper atmosphere). The geomagnetic storms can be triggered by the activities on the Sun and in the heliosphere\, which ca n strongly influence the coupling between magnetosphere and ionosphere\, an d the energy deposited into the upper atmosphere. The impact of geomagnetic storms on our geospace environment and society is the primary focus of spa ce weather action. The typical space weather impacts include changing satel lite orbits through increasing atmospheric drag\, damaging the power lines and pipelines through geomagnetically induced currents (GICs)\, influencing the GPS and high-frequency (HF) communications through ionospheric variati ons. A recent significant change in our understanding of the ionosphere-the rmosphere system is the frequent driving by dynamic meso-scale structures ( 50 km - 500 km) that couple to the magnetosphere in the polar cap region\, the dayside cusp and along auroral oval and sub-auroral magnetic field line s. These structures play a critical role in Space Weather dynamics\, intera cting with the more slowly changing\, large-scale structure that is more di rectly driven by interaction with the solar wind. The Global Ionosphere The rmosphere Model (GITM)\, a self-consistent non-hydrostatic model in the upp er atmosphere with a flexible resolution\, is suitable for studying transie nt meso-scale phenomena. To improve the description of meso-scale structure s in geomagnetic forcing and to evaluate the influence of such structures o n the global dynamics of the upper atmosphere\, various data and models are utilized to investigate the variations of energy inputs in the cusp\, sub- auroral regions and within flow bursts\, and their influences on the couple d thermosphere-ionosphere system.

    Notes: \;Join the meeting at 4 :15 for meet and greet.  \;Visit https://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220329T231830Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210331T193000Z DTEND:20210331T203000Z DTSTAMP:20260828T094430Z UID:1rgt6u2cjnf0l7qljlqrto7fbu@google.com CREATED:20210325T143333Z DESCRIPTION:Title : Reversible Computing: The Only Future for General Digit al Computing\n\nSpeaker Name: Dr. Michael Frank\n\nSpeaker Institution : Sa ndia National Laboratories\n\nAbstract : The conventional\, non-reversible approach to general digital computing is approaching hard limits due to fun damental thermodynamic constraints. Physics guarantees that every possible path forward that does not fundamentally change the computing paradigm will suffer from diminishing returns. However\, we can still continue to improv e the efficiency of general digital computing far beyond the limits of the conventional approach by transitioning to the reversible computing paradigm . This is clearly distinct from quantum computing\, because its focus is on raw energy efficiency for general computing\, not quantum coherence for sp ecial-purpose algorithms. The basic engineering principles of reversible co mputing have already been demonstrated in both semiconducting and supercond ucting technology platforms. In contrast to all other approaches to general digital computing\, reversible computing offers a long-term path forward t owards ever-greater levels of computing efficiency\, with no clear limits i n sight. LAST-MODIFIED:20210325T143333Z LOCATION:Virtual: Email LPS_Seminar@lps.umd.edu for a link to the meeting. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211004T190000Z DTEND:20211004T203000Z DTSTAMP:20260828T094430Z UID:7c4qq63ouc2a7ql8fbv8h49b1g@google.com CREATED:20210907T133454Z DESCRIPTION:Speaker: Maira Dutra\, Carleton University\n\nTitle: Testable p ortal models of FIMP dark matter\n\nAbstract: Dark matter particles can int eract so weakly with the standard\nmodel fields that they may never have re ached thermal equilibrium in the\nearly universe. The relic density of such feebly interacting massive\nparticles (FIMPs) is produced via the so-calle d freeze-in mechanism.\nThis possibility can explain why we have not yet de tected dark matter\nbut is also appealing from a theoretical perspective si nce tiny\ncouplings might be a consequence of GUT scale fields. In this tal k\, I\nwill overview the literature on FIMP phenomenology and present two\n testable FIMP models. The first model is a neutrino portal where three\nrig ht-handed heavy neutrinos participate in the type-I seesaw mechanism\nwhile mediating interactions between the visible and dark sectors. If a\nsuffici ently long early matter-dominated period occurred during the\nfreeze-in pro cess\, FIMP self-annihilation becomes testable by indirect\ndetection exper iments. The second model is a Z' portal in which the SM\nfermions and a fer mionic dark matter candidate are both charged under a\nnew U(1) symmetry. R emarkably\, the rich phenomenology of Z' bosons is\ncurrently constraining regions of the Z' parameter space in which the\ndark matter relic density i s achieved via freeze-in. LAST-MODIFIED:20210928T132928Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T180000Z DTEND:20210909T190000Z DTSTAMP:20260828T094430Z UID:5vvgd3fen8lc0c7ele414pgfdl@google.com CREATED:20210904T025456Z DESCRIPTION:Title: Trapdoor claw-free functions in quantum cryptography\nS peaker: Carl Miller (QuICS)\nTime: Thursday\, September 9\, 2021 - 2:00pm \nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91375701575\n\nTrapdoo r claw-free functions (TCFs) are central to a recent wave of groundbreaking work in quantum cryptography that was originated by U. Mahadev and other a uthors. TCFs enable protocols for cryptography that involve quantum comput ers and classical communication. In this expository talk I will present th e definition of a TCF and its variants\, and I will discuss quantum applica tions\, including the recent paper "Quantum Encryption with Certified Delet ion\, Revisited: Public Key\, Attribute-Based\, and Classical Communication " by T. Hiroka et al. (arXiv:2105.05393). LAST-MODIFIED:20210904T025456Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Carl Miller TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T190000Z DTEND:20211013T203000Z DTSTAMP:20260828T094430Z UID:2tlm0a782ql8tl8af7d3lmgpsi@google.com CREATED:20211011T201635Z DESCRIPTION:Speaker: Alejandro Corichi\, Center for Mathematical Sciences\, National University of Mexico (UNAM)

    Title: Canonical analysis of g auge theories in regions with boundaries.

    Abstract: In this talk\, I shall outline a recent proposal for an extension of the Dirac algorithm fo r theories defined in regions with boundaries. While in many physical syste ms the strategy put forward by Regge-Teitelboim works well\, there are case s in which it is incomplete. Our proposal aims to fill this gap and have a generic method. We shall illustrate the formalism by considering a couple o f examples\, namely the Maxwell-Pontryagin theory in 4D\, and certain isola ted horizons in vacuum GR.

    Recording of Seminar can be viewed here: https://umd.z oom.us/rec/play/8TwY5SqdOmQ9Y9oPpHLgA_hWekDxE4kYd2y2Y0a8UusMQXs5fpaB-Mgsqd_ M4C8HG-T6KXppXEoMwkMI.AVvhXx6tVTTwTDl8

    Seminar is in person\, bu t will also be streamed via zoom: https://umd.zoom.us/j/99307158788 LAST-MODIFIED:20211018T133534Z LOCATION:PSC 3150 and Online SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211112T183000Z DTEND:20211112T193000Z DTSTAMP:20260828T094430Z UID:3vbj2tkpv9j7t06k9mhv1l4n6o@google.com CREATED:20210809T204512Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Josh Rude rman\, NYU

    Preceded by lunch at 12:30pm.

    Title: Dark Sector Prospects Away from Equilibrium

    Abstract: Different cosmologies for dark matter\, or dark radiation\, lead to diver se observational prospects. Standard Model particles were in thermal equil ibrium at early times. A simple and predictive ansatz is that the dark sec tor was also in thermal equilibrium. In this talk I will consider the oppo site regime\, where dark matter or dark radiation is produced through non-e quilibrium processes. I will describe how oscillations between photons and dark photons can be tested by 21cm cosmology and radio observations. I wi ll also show that dark matter may have been produced through an explosive p eriod of exponential growth\, in analogy to the spread of contagions.
    For info\, contact mknouse@umd.edu LAST-MODIFIED:20211112T142212Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210713T133000Z DTEND:20210713T153000Z DTSTAMP:20260828T094430Z UID:2t5i3bqg6lhl3sag2238eo2a7u@google.com CREATED:20210629T160311Z DESCRIPTION:Title: Locality\, Symmetry\, and Digital Simulation of Quantum Systems\nSpeaker: Minh Tran (QuICS)\nTime: Tuesday\, July 13\, 2021 - 9:30 am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/3528081788\n\nBesides potentially delivering a huge leap in computational power\, quantum comput ers also offer an essential platform for simulating properties of quantum s ystems. Consequently\, various algorithms have been developed for approxim ating the dynamics of a target system on quantum computers. But generic qua ntum simulation algorithms---developed to simulate all Hamiltonians---are u nlikely to result in optimal simulations of most physically relevant system s\; optimal quantum algorithms need to exploit unique properties of target systems.\n\nThe aim of this dissertation is to study two prominent properti es of physical systems\, namely locality and symmetry\, and subsequently le verage these properties to design efficient quantum simulation algorithms.\ n\nIn the first part of the dissertation\, we explore the locality of quant um systems and the fundamental limits on the propagation of information in power-law interacting systems. We prove upper limits on the speed at which information can propagate in power-law systems. We also demonstrate how suc h speed limits can be achieved by protocols for transferring quantum inform ation and generating quantum entanglement. We then use these speed limits t o constrain the propagation of error and improve the performance of digital quantum simulation. Additionally\, we consider the implications of the spe ed limits on entanglement generation\, the dynamics of correlation\, the he ating time\, and the scrambling time in power-law interacting systems.\n\nI n the second part of the dissertation\, we propose a scheme to leverage the symmetry of target systems to suppress error in digital quantum simulation . We first study a phenomenon called destructive error interference\, where the errors from different steps of a simulation cancel out each other. We then show that one can induce the destructive error interference by interwe aving the simulation with unitary transformations generated by the symmetry of the target system\, effectively providing a faster quantum simulation b y symmetry protection. We also derive rigorous bounds on the error of a sym metry-protected simulation algorithm and identify conditions for optimal sy mmetry protection. LAST-MODIFIED:20210629T160311Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Minh Tran TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210309T160000Z DTEND:20210309T170000Z DTSTAMP:20260828T094430Z UID:15vua6e4c3lo5lkvsrd8r9fp38@google.com CREATED:20210301T181022Z DESCRIPTION:


    Speaker: \;Yu-Ping Lin (Ph.D. Can didate at CU Boulder)
    Time: Mar 9\, 2021 11:00 AM \;

    < br>Title: Novel phases at Van Hove singularities in graphene moiré s ystems

    Abstract: I will present the weak-coupling renormaliza tion group analyses at the Van Hove singularities in graphene moiré systems \, where various novel correlated phases can develop. Motivated by the stru ctures of low-energy flat bands on the moiré superlattices\, I \;will f ocus on the two-orbital hexagonal lattice models at the Van Hove doping. Fi rst\, I will show that a chiral 'high-Tc'-like phase diagram \;is hoste d by an SU(4) symmetric model with conventional Van Hove singularity. A d-w ave staggered-flux Chern insulator occurs at the Van Hove singularity\, whi ch \;is flanked by the d-wave chiral superconducting domes on both side s of doping. Upon valley splitting which breaks the SU(4) symmetry\, the ph ase diagram turns into a competition between chiral superconductivity and v arious spin and/or valley density waves. Second\, I will demonstrate how va rious polarized ordered phases may occur when the Van Hove singularity beco mes 'high-order'. The potential correlated \;phases include the p-wave chiral and helical and d-wave chiral superconductivities\, s-wave ferromagn etism\, as well as f-wave and p-wave polar valley-polarized orders.

    Reference:
    [1] Yu-Ping Lin and Rahul M. Nandkishore\, Phys. Rev. B 100\, 085136 (2019)
    [2] Yu-Ping Lin and Rahul M. Nandkishore\, Phys. Rev. B 1 02\, 245122 (2020)

    Please email rcawthor@umd.edu for Zoom details  \; LAST-MODIFIED:20210301T181022Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211202T160000Z DTEND:20211202T173000Z DTSTAMP:20260828T094430Z UID:3a9mqlppo4ug0e3u3um8qa1mqs@google.com CREATED:20210901T143443Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    social hour at 11:20am with the seminar at 11:30am

    Speaker: Ermal Rapaj\, Berke ley

    Title: "Entanglement and correlations in collective multi-angle neutrino flavor evolution"


    Abstract:
    In astrophysical scenari os with large neutrino density\, like supernovae\, compact object binary me rgers\,
    and the early universe\, the presence of neutrino-neutrino inter actions can give rise to collective flavor oscillations
    in the out-of-eq uilibrium collective dynamics of a neutrino cloud. These oscillations are c ritical to determine the neutrino flavor content\,
    which has striking im pacts on core-collapse supernovae or compact binary merger remnants.
    Lar ge neutrino fluxes emitted from the proto-neutron star\, in the case of sup ernovae\,
    or from the hyper-massive neutron star remnant\, in the case o f mergers\,
    not only provide heating and cooling mechanisms on the eject a\,
    but also alter the nucleosynthesis by determining the neutron-to-pro ton ratio.
    Additionally\, the flavor ratio is a key observable for the n ext Galactic supernova event.
    It is a challenging many-body problem that so far has been mainly studied at the mean-field approximation.
    It has been argued in the past that simple models of the neutrino Hamiltonian desi gned to describe forward scattering
    can support substantial flavor evolu tion on very short time scales.
    In this work\, we combine tensor network methods and other recent developments in
    studying flavor evolution for large particle systems and find interesting links between dynamic developme nt of entanglement and correlations
    and collective phenomena. \;&nbs p\; LAST-MODIFIED:20211202T142814Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220126T203000Z DTEND:20220126T213000Z DTSTAMP:20260828T094430Z UID:4f8rlrrmanfkfpe0urerh7kpr3@google.com CREATED:20220120T210156Z DESCRIPTION:

    Please join us for our first in 2022 seminar next Wednesday January 26 at 3:30 PM

    OPTICAL QUANTUM INTERCONNECT S FOR SUPERCONDUCTING QUANTUM PROCESSORS

    Alp Sipahigil\, Univ ersity of California\, Berkeley

    Abstract: \;The ab ility to store\, transfer\, and process quantum information promises to tra nsform how we calculate\, communicate\, and measure. In the past two decade s\, superconducting microwave circuits based on Josephson junctions emerged as a powerful platform for quantum computation. However\, these systems op erate at low temperatures and microwave frequencies\, and require coherent optical interconnects to transfer quantum information across long distances . In this talk\, I will present our recent experiments demonstrating the tr ansduction of a superconducting qubit excitation to an optical photon. I wi ll present an integrated device platform combining superconducting qubits\, piezoelectric transducers\, and optomechanical transducers for converting quantum states between superconducting circuits\, single phonons\, and sing le optical photons. I will discuss how we use nanomechanical oscillators in their quantum ground states to convert single photons from microwave frequ encies to the optical domain. I will conclude by discussing the prospects o f this approach for realizing future quantum communication networks based o n superconducting quantum processors.

    Bio: \;Alp S ipahigil is an Assistant Professor of Electrical Engineering and Computer S ciences at the University of California\, Berkeley\, the Chang Hui Faculty Fellow\, and Co-Director of Berkeley Sensor and Actuator Center (BSAC). He has joint appointments as a Faculty Scientist at the Materials Sciences Div ision at Lawrence Berkeley National Laboratory and a supporting appointment at UC Berkeley Physics. His research is in solid-state quantum technologie s\, with a focus on hybrid quantum devices based on superconducting qubits\ , nanomechanics\, nanophotonics\, and atom-like defects in solids. Prior to joining Berkeley in 2021\, he was an Institute for Quantum Information and Matter postdoctoral scholar at Caltech. He received his Ph.D. in Physics f rom Harvard University in 2017 and his B.S. degrees in Physics and Electric al Engineering from Bogazici University in 2010.

     \;

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    LAST-MODIFIED:20220121T134420Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=mc83a2e410a4507b02 c7d9228706fa329 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar Series: OPTICAL QUANTUM INTERCONNECTS FOR SUPERCONDUCTI NG QUANTUM PROCESSORS TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T150000Z DTEND:20211118T160000Z DTSTAMP:20260828T094430Z UID:73cn3svrvcnk7rh2thjp6edton@google.com CREATED:20211109T153442Z DESCRIPTION:Title: Distinguishing between quantum and classical Markovian dephasing dissipation\nSpeaker: Alireza Seif (University of Chicago)\nTime: Thursday\, November 18\, 2021 - 10:00am\nLocation: ATL 3100A and Virtual V ia Zoom: https://umd.zoom.us/j/2639797355\n\nUnderstanding whether dissipat ion in an open quantum system is truly quantum is a question of both fundam ental and practical interest. We consider a general model of n qubits subje ct to correlated Markovian dephasing\, and present a sufficient condition f or when bath-induced dissipation can generate system entanglement and hence must be considered quantum. Surprisingly\, we find that the presence or ab sence of time-reversal symmetry (TRS) plays a crucial role: broken TRS is r equired for dissipative entanglement generation. Further\, simply having no n-zero bath susceptibilities is not enough for the dissipation to be quantu m. Our work also present an explicit experimental protocol for identifying truly quantum dephasing dissipation\, and lays the groundwork for studying more complex dissipative systems and finding optimal noise mitigating strat egies. LAST-MODIFIED:20211109T153442Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2639797355 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Alireza Seif TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220304T180000Z DTEND:20220304T184500Z DTSTAMP:20260828T094430Z UID:07ojmpkmgafa6tdnef8ca5n8vu@google.com CREATED:20220225T140440Z DESCRIPTION:Title: Neural-Network Decoders for Measurement Induced Phase T ransitions\nFriday Quantum Seminar\nSpeaker: Hossein Dehghani (JQI)\nTime: Friday\, March 4\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoo m: https://umd.zoom.us/j/96160177762\n\nMonitored random unitary circuits w ith intermittent measurements can host a phase transition between a pure an d a mixed phase with different entanglement entropy behaviors with the syst em size. Recently\, it was demonstrated that these phase transitions can be locally probed via entangling reference qubits to the quantum circuit and studying the purification dynamics of the reference qubits. After disentang ling from the circuit\, the state of the reference qubit can be determined according to the measurement outcomes of the qubits in the circuit. In this work\, we leverage modern machine learning tools to decode the state of th e reference qubits. In particular\, by considering circuits with given rand om operators and measurement locations\, we design a neural network decoder to efficiently determine the state of the reference qubit based on the mea surement records. Next\, after studying the complexity of our neural netwo rk decoders\, we demonstrate that entanglement entropy scaling phase transi tion can be translated into the learnability of the decoder function. Final ly\, we show that our learning procedure is transferable from smaller circu its to larger circuit with hundreds of qubits which proves the scalability of our method.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220225T140440Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Hossein Dehghani TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210205T180000Z DTEND:20210205T190000Z DTSTAMP:20260828T094430Z UID:00vevvvfpeo13uaoemi9ot4m9g@google.com CREATED:20210126T155322Z DESCRIPTION:Speaker: Feng Lin\, Assistant Professor\, Chemistry Virginia Te ch

    Title: \;Investigating Solid-Liquid Interfaces and Defect Che mistry in Electrochemical Energy Materials

    Abstract: Our research fo cuses on understanding how electrochemical interfaces and defect chemistry govern the nucleation and propagation of redox reactions in solids\, with a strong focus on tackling fundamental materials chemistry challenges using advanced synchrotron X-ray analytical techniques. We aim to advance fundame ntal insights that can broadly and positively impact the development of mat erials electrochemistry for next-generation energy solutions including batt eries\, renewable fuels\, and smart windows. To date\, we have made progres s in probing how local chemical and structural heterogeneities\, such as gr ain boundaries\, dislocations\, point defects\, and electrochemical interfa ces\, govern the redox reactions in redox-active solids. Such progress has allowed us to design and synthesize a vast array of new energy materials fo r low-cost\, sustainable\, high-performance electrochemical energy systems. We will start the presentation by providing an overview of our research pr ogram. Then we will highlight two coherent topics. First\, we will present our study on determining the atomic and molecular origins of surface-mediat ed electrochemical processes through probing the metal ion speciation and i nterfacial structural transformations under electrochemical operating condi tions. Second\, we will report our study on controlling the charge nucleati on and propagation in solids by engineering nanoscale defect chemistry. We will show that a precise control of crystallographic defects and their dist ributions can potentially promote and homogenize redox reactions in battery materials\, creating a new path towards developing fast-charging batteries .

    via Zoom: Please contact \;Sherri Tatum \;statum12@umd.edu& nbsp\; \; LAST-MODIFIED:20210126T155322Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211029T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211021T140000 DTSTAMP:20260828T094430Z UID:0v6nmv83sdjqu7f84eiegc9pai@google.com CREATED:20210924T121945Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: Takeuchi\n \nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121945Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Gen Yin\, Georgetown University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T200000Z DTEND:20220510T213000Z DTSTAMP:20260828T094430Z UID:25ktfdgvhapamhtnqjh363ks2d@google.com CREATED:20220120T220916Z DESCRIPTION:Speaker: Jeff Newman\, University of Pittsburgh

    < b>DESI and Beyond: Exploring the Universe with Spectroscopic Surveys

    Abstract: Over the past two decades\, large spectroscopic surv eys have measured the redshifts of millions of individual galaxies an d quasars\, allowing us to map the three-dimensional distribution of matter in the Universe.  These experiments help to constrain the nature of dark energy by measuring the baryonic acoustic oscillation (BAO) distance scale\, test for deviations from general relativity by measuring redshift-s pace distortions in the observed clustering of galaxies\, and place limits on neutrino masses via the strength of clustering signals.  In this talk\, I will primarily focus on the plans for and status of the ongoing Dark Ener gy Spectroscopic Instrument (DESI) survey. DESI is the first of the next-ge neration\, "Stage IV" dark energy experiments to begin operations.  I will also summarize key results from the recently-completed Sloan Digital Sky Su rvey-4 eBOSS survey\, which has helped to prototype methods now being used for DESI.  Finally\, I will briefly describe ideas for new telescopes and i nstruments that would enable surveys an order of magnitude larger than what is possible now\, as well as how such surveys would help us to understand our universe. LAST-MODIFIED:20220504T201233Z LOCATION:1412 Toll Physics Bldg SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210203T203000Z DTEND:20210203T213000Z DTSTAMP:20260828T094430Z UID:5v7iolp1qbtf47hiuskn2pd5ab@google.com CREATED:20210125T144142Z DESCRIPTION:Title : Calculating the linear critical gradient for the ion-te mperature-gradient mode in magnetically confined plasmas

    Speaker Nam e: Gareth Roberg-Clark
    Speaker Institution : Max-Planck-Institut für Pla smaphysik
    Notes: E-mail \;swisdak@u md.edu \;for Zoom coordinates.

    Abstract : A first-principles method to calculate the critical temperature gradient for the onset of the ion-temperature-gradient mode (ITG) in linear gyrokinetics is presented. W e find that conventional notions of the connection length previously invoke d in tokamak research should be revised and replaced by a generalized corre lation length to explain this onset in stellarators. Simple numerical exper iments and gyrokinetic theory show that localized "spikes" in shear\, a hal lmark of stellarator geometry\, are generally insufficient to constrain the parallel correlation length of the mode. ITG modes that localize within ba d drift curvature wells that have a critical gradient set by peak drift cur vature are also observed. A case study of nearly helical stellarators of in creasing field period demonstrates that the critical gradient can indeed be controlled by manipulating magnetic geometry\, but underscores the need fo r a general framework to evaluate the critical gradient. We conclude that a verage curvature and global shear set the correlation length of resonant IT G modes near the absolute critical gradient\, the physics of which is inclu ded through direct solution of the gyrokinetic equation. Our method\, which handles general geometry and is more efficient than conventional gyrokinet ic solvers\, could be applied to future studies of stellarator ITG turbulen ce optimization. \; \;

    Host: Marc Swisdak
    Host e-mail: sw isdak@umd.edu LAST-MODIFIED:20210125T144142Z LOCATION:Please e-mail swisdak@umd.edu for Zoom coordinates. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma/Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210426T200000Z DTEND:20210426T210000Z DTSTAMP:20260828T094430Z UID:063u7cot3bi51aksgt54njd3p7@google.com CREATED:20210426T145719Z DESCRIPTION:

    Please encourage anyone interested to join the last QMC career talk of the year!

    Dr. Tomek Kott is a senior scientist in the Condensed Matter Physics S ection in the Computational and Experimental Physics Group at the John Hopk ins University Applied Physics Lab. He has led several interdisciplinary te ams in projects varying from liquid metal antennas and power generation on Venus to the prediction of qubit system properties and free space optical c ommunication. Most recently\, he has switched to data science. He just fini shed serving as the Secretary for the Mid-Atlantic Section of the American Physical Society. He graduated from Bucknell University in 2006 with a B.S. in Physics\, and from the University of Maryland\, College Park\, in 2012 with a Ph.D. in condensed matter physics. He joined APL as a post-doc and h as been there for 8 years. He has been previously been a supervisor of 9 st aff members and has recently moved to Lancaster\, PA\, where he is working remotely full time. As a University Affiliated Research Center\, APL is a n onprofit organization that conducts essential research\, development\, and systems engineering to support national security needs free from conflicts of interest or competition with commercial industry.

    Dr. Kott will discu ss his career path\, from UMD to APL\, details about APL and what it is lik e to work there and some examples of his recent work with NASA and DARPA.
    Link: \; \;https://umd.zoom.us/j/96975735470?pwd=< wbr>V3lPTkdYTHRCTU5UcHlWTThtcEZSdz09

    Meeting ID: 969 7573 5 470
    Passcode: 005596 LAST-MODIFIED:20210426T145719Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838c CAREER talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T180000Z DTEND:20220420T193000Z DTSTAMP:20260828T094430Z UID:2daiv6c4sh813p4bj5cari714v@google.com CREATED:20220411T131832Z DESCRIPTION:*Special Joint Gravity-Particle Theory Semina r*-

    Speaker: \;Edgar Shaghoulian\, U of Pennsylvania

    Tit le: The central dogma and entanglement in de Sitter space

    Abstract: The central dogma of black hole physics – which says that from the outside a black hole can be described in terms of a quantum system with exp(Area/4 G) states evolving unitarily – has recently been supported by computations indicating that the interior of the black hole is encoded in the Hawking ra diation of the exterior. In this paper\, we probe whether such a dogma for cosmological horizons has any support from similar computations. The fact t hat the de Sitter bifurcation surface is a minimax surface (instead of a ma ximin surface in the case of black holes) causes problems with this interpr etation when trying to import calculations analogous to the AdS case. This suggests placing the holographic dual on the de Sitter horizon itself\, whe re we formulate a two-sided extremization prescription for computing entang lement entropy in the holographic dual. We find answers consistent with gen eral expectations for a quantum theory of de Sitter space\, including a van ishing total entropy and an entropy of A/4G when restricting to a single st atic patch. We will also explore some of its more exotic predictions.     LAST-MODIFIED:20220411T131832Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Gravity-Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220614T151500Z DTEND:20220614T160000Z DTSTAMP:20260828T094430Z UID:0i0tgoivmtiv97sg8d96m9m0ph@google.com CREATED:20220608T151218Z DESCRIPTION:When: 6/14 at 11:15 am
    Where: ATL4402 (CMTC Co nference Room)
    Schedule:
    11:15 - Ali Lavasani
    11:30 - Yi-Hu a Lai
    11:45 - Subhayan Sahu LAST-MODIFIED:20220608T151218Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Graduate Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211007T140000 DTEND;TZID=America/New_York:20211007T153000 DTSTAMP:20260828T094430Z UID:4a4f7v7a715rs49hagpiqabcmc@google.com RECURRENCE-ID;TZID=America/New_York:20211007T140000 CREATED:20210924T121100Z DESCRIPTION:Title: \; Searching for flat bands in kagome lattice metals
     \;
    Abstract: \;

    The two-dimensionalkagome lattice model— aside from playing a central part in the context ofmagnetic frustration—has long provided a fruitful theoretical ground for the studyof topological an d correlated electronic phases\, thanks to its peculiar bandfeatures includ ing Dirac fermions and a dispersionless flat band. In recentyears\, a growi ng family of transition element-based intermetallic compoundstermed “kagome metals” are experimentally identified to realize these characteristickagom e band features. Here I will introduce our efforts to search for flatbands in the vicinity of the Fermi level in kagome metals based particularly onla te 3d transition elements (Fe\, Co\, Ni) [1-3]. I will discuss the implicat ionof these flat bands on magnetism and highlight the essential role of d-o rbitaldegrees of freedom therein—insights from which we anticipate to be ap plicableto designing flat bands in broader classes of crystalline materials .

    [1]M. Kang\, LY et al.\, Dirac fermions and flat bands in the ideal kagome metalFeSn\, Nat. Mater. 19\, 163-169 (2019).

    [2]M. Kang et al .\, Topological flat bands in the frustrated kagome lattice CoSn\,Nat. Comm un. 11\, 4004 (2020).

    [3]LY et al.\, A flat band-induced correlated k agome metal\, arXiv/2106.10824



    Host: Paglione

    Seminar wil lalsobroadcast viaZOOM
    ht tps://umd.zoom.us/j/ 91301075848
     \;
    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080623Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Linda Ye\, Stanford University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 7_Linad Ye.pdf;FMTTYPE=application/pdf:h ttps://drive.google.com/file/d/1MFNbnxdanqQ8B32lj41_RbEWnB3a_UUr/view?usp=d rive_web END:VEVENT BEGIN:VEVENT DTSTART:20220415T170000Z DTEND:20220415T174500Z DTSTAMP:20260828T094430Z UID:7ms83d44i3ajnh56mlrhfv1rr3@google.com CREATED:20220405T173503Z DESCRIPTION:Title: Non-equilibrium critical phenomena in a trapped-ion qua ntum simulator\nSpeaker: Arinjoy De (JQI)\nTime: Friday\, April 15\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nRecent work has predic ted that quenched near-integrable systems can exhibit dynamics associated w ith thermal\, quantum\, or purely non-equilibrium phase transitions\, depen ding on the initial state [1]. Using a trapped-ion quantum simulator with i ntrinsic long-range interactions\, we investigate collective non-equilibriu m properties of critical fluctuations after quantum quenches. In particular \, we probe the scaling behavior of fluctuations near the critical point of the ground-state disorder-to-order phase transition\, after single and dou ble quenches of the transverse field in a long-range Ising Hamiltonian. Wit h system sizes of up to 50 ions\, we show that both the post-quench fluctua tion magnitude and dynamics scale with system size with distinct critical e xponents\, characterizing the type of phase transition. Furthermore we demo nstrate that the critical exponents after a single and a double quenches ar e different and correspond to effectively thermal and truly non-equilibrium behavior\, respectively. Our results demonstrate the ability of quantum si mulators to explore universal scaling beyond the equilibrium context.\n\n[1 ] Paraj Titum and Mohammad F. Maghrebi\, Phys. Rev. Lett. 125\, 040602 (202 0)\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220405T173503Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Arinjoy De TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211001T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:61pomjs6tmmolr68r2ctdphsbl@google.com CREATED:20210924T120935Z DESCRIPTION:

    Strongly Driven Quantum Materials   

    David Hsieh

    California I nstitute of Technology

    Driving strongly correlatedel ectron systems far from equilibrium can lead to fundamentally new many-body phenomena that are thermally inaccessible. In this talk\, I will describe a series of recent experiments that leverage advanced ultrafast optical spect roscopictechniques to uncover transient properties of Mott insulators drive n by intenseelectromagnetic fields. By tailoring the characteristics of the electromagneticfield\, I will show how different out-of-equilibrium phenom ena can beselectively realized. In particular\, I will highlight the contro l of magneticorder using resonant driving\, the nonlinear production of ele ctron-hole pairsvia off-resonant driving\, and coherent “Floquet” engineeri ng of electronic bandstructures and optical properties via far off-resonant driving.   


    Host: PAGLIONE

    This seminar will be broad case via ZOOM:
    https://umd.zoom.us/s/91301075848 LAST-MODIFIED:20210924T120935Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM (zoom): David Hsieh\, Caltech TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220317T180000Z DTEND:20220317T190000Z DTSTAMP:20260828T094430Z UID:49jm6krka3uuf80it0h1i9e3eo@google.com CREATED:20220310T152151Z DESCRIPTION:Title: Geometry of Banach spaces: a new rout e towards Position Based Cryptography
    Speaker: Aleksander Kubicki (Unive rsity Complutense of Madrid)
    Time: Thursday\, March 17\, 2022 - 2:00pmLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99750827019

    In this talk I wi ll explain how some techniques coming from the local theory of Banach space s can be used to obtain claims about the security of protocols for Position Based Cryptography. In particular\, I will show how the knowledge about ce rtain geometrical properties of particular Banach spaces (tensor norms on t ensor products of Hilbert spaces) can be translated into lower bounds on th e resources needed for cheating in this cryptographic task. I will finish p ointing out some open problems and future directions suggested by our work. The contents of the talk are based on arXiv:2103.16357 (joint work with M. Junge\, C. Palazuelos and D. Pérez-García).

    (In perso n viewing at 3100A Atlantic Building)
     LAST-MODIFIED:20220310T211502Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99750827019 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Aleksander Kubicki TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220721T180000Z DTEND:20220721T190000Z DTSTAMP:20260828T094430Z UID:1tmvdqc4lhn575mbq9ts3f0v7v@google.com CREATED:20220715T170953Z DESCRIPTION:Title: A sufficient family of necessary inequalities for the q uantum marginals problem\nSpeaker: TC Fraser (Perimeter Institute)\nTime: T hursday\, July 21\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https:// uwaterloo.zoom.us/j/96276466460?pwd=Y21OaFJhM3BpWWMwQkY3QWYrMDFZZz09\n\ nThe quantum marginals problem (QMP) aims to understand how the various mar ginals of a joint quantum state are related to one another by deciding whet her or not a given collection of marginals is compatible with some joint qu antum state. Although existing techniques for the QMP are well developed fo r the special case of disjoint marginals\, the same is not true for the gen eric case of overlapping marginals. The leading technique for the generic Q MP\, published by Yu et. al. (2021)\, resorts to evaluating a hierarchy of semidefinite programs.\n\nIn this talk\, I will introduce a slightly differ ent approach to the QMP by demonstrating how to construct a simple hierarch y of operator inequality constraints each of which are necessarily satisfie d by any collection of marginals of a joint quantum state. Then\, using sta te-estimation techniques and large deviation theory\, I will sketch the pro of that the satisfaction of these inequalities is additionally sufficient f or a collection of marginals to be compatible with some joint quantum state . LAST-MODIFIED:20220715T170953Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/96276466460?pwd=Y21O aFJhM3BpWWMwQkY3QWYrMDFZZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: TC Fraser TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220914T170000Z DTEND:20220914T180000Z DTSTAMP:20260828T094430Z UID:5qpog02ht3dce05dv0mp74ts17@google.com CREATED:20220908T152505Z DESCRIPTION:Title:  Introduction to Proofs of Quantumness
    Speaker:  Mana si Shingane (QuICS)
    Time:  Wednesday\, September 14\, 2022 - 1:00pm
    L ocation:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

    In this talk I will give an i ntroduction to proofs of quantumness. Such protocols can be executed using local quantum computations and only classical communication. I will begin b y defining and motivating proofs of quantumness. I will then describe the s pecific construction by Brakerski et al. [1] and how it uses the Learning w ith Errors problem. Finally\, I will briefly describe proofs of quantumness protocols based on other cryptographically hard problems.

    [1] Brake rski\, Z.\, Christiano\, P.\, Mahadev\, U.\, Vazirani\, U.\, &\; Vidick\ , T. (2021). A cryptographic test of quantumness and certifiable randomness from a single quantum device. LAST-MODIFIED:20220908T152505Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Manasi Shingane TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220928T193000Z DTEND:20220928T213000Z DTSTAMP:20260828T094430Z UID:5vvj4uaqdd0a4l5nsft3atvdqa@google.com CREATED:20220815T130444Z DESCRIPTION:Speaker: Dr. Georges Pavlidis\, Assistant Professor\ , Mechanical Engineering\, University of Connecticut

    Title: Enhancin g Thermal Transport across Interfaces: Transitioning from the Microscale to Nanoscale

    Abstract: \;    Wide bandgap semic onductors have shown great potential for RF devices and power electronics.& nbsp\; Their superior material properties have enabled the fabrication of h igh power and high frequency devices. Their performance\, however\, has bee n limited by significant localized Joule heating. \; The quantification of operational parameters such as the gate temperature is thus necessary t o accurately assess the device's quality and lifetime. The first part of th e talk will present novel methods for in-situ transient temperature measure ments of various devices with different geometries and advanced thermal man agement solutions. This includes developing a near bandgap thermoreflectanc e imaging technique and performing the first ever cross-sectional thermal i mage of a GaN transistor. While micrometer resolution thermal characterizat ion techniques are advantageous\, the feature size of electronics is contin ually reducing. \; Characterization tools that can capture transport ph enomena on the nanoscale are thus necessary. \; The second part will co ver Atomic Force Microscopy (AFM) based techniques used to obtain thermal p roperties with nanometer resolution. This includes scanning thermal microsc opy (SThM) of neuromorphic devices for emerging bio-inspired circuits\; GaN superlattice FETs for high frequency applications\; and Gallium Oxide base d power transistors. Additionally\, a coupled AFM-IR technique is introduce d using novel optomechanical probes for interfacial thermal conductance map ping. Compared to traditional AFM\, these probes demonstrate a 50x improvem ent in the signal to noise ratio and increase the time resolution to 10 ns.

    Bio:

    Dr. Georges Pavlidis joined the Depa rtment of Mechanical Engineering at the University of Connecticut as an Ass istant Professor in 2022. Prior to that\, he was an NRC Postdoctoral Resear cher in the Nanoscale Spectroscopy Group. He earned his M.Eng in Mechanical Engineering from Imperial College London in 2013 and his Ph.D. degree in M echanical Engineering from the Georgia Institute of Technology in 2018. Dr. Pavlidis specializes in the thermal characterization of WBG semiconductors for RF and power electronics. He has developed electrical/optical methods\ , with high spatial and temporal resolution\, to assess the performance and reliability of III-nitrides devices. His recent publications investigate i mproving hBN polariton lifetimes and developing high throughput techniques for interfacial thermal conductance mapping.

    LAST-MODIFIED:20220912T170204Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T181500Z DTEND:20220301T191500Z DTSTAMP:20260828T094430Z UID:3g0175j6f10uifukm71n1sahbv@google.com CREATED:20220207T154307Z LAST-MODIFIED:20220222T142750Z LOCATION:IPST Building #085\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T180000Z DTEND:20220421T193000Z DTSTAMP:20260828T094430Z UID:1bupt7e9n22nu75d5fuf20lc8m@google.com CREATED:20220414T181949Z DESCRIPTION:

    Title: Disorder in topological semimetals: insights from epi taxy \;

    Abstract: Topological semimetals\, characterized by linea r band touching nodes near the Fermi level\, exhibit remarkable band struct ure and transport phenomena. While such phenomena have largely been discove red and studied in bulk crystals\, epitaxial layers will ultimately be requ ired to realize devices. We must therefore understand and control the impac t of disorder occurring in epitaxial material\, including point and extende d defects and interfaces. In this talk\, I will discuss our work to this en d in the prototypical Dirac semimetal Cd3As2. Drawing on decades of collective knowledge of disorder regulation in conventional semiconductors\, we use molecular beam epitaxy on zinc blende substrates to select the crystallographic orientation of the epilayer\, systematically v ary point defect populations and synthesize alloys. These factors offer rou tes to tune the electron concentration and mobility and allow us to probe h ow defects impact magneto transport behavior. I will also discuss the imple mentation of double heterostructures to enable new vertical photodetector d esigns and other future devices.


    Host: Paglione
     \;
    Locati on: Toll Physics Rm 1201

    Seminar also on Zoom
    Meeting \;Link:  \; \;https://umd.zo om.us/j/91301075848 LAST-MODIFIED:20220414T182150Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Kirstin Alberi\, NREL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T150000Z DTEND:20220408T160000Z DTSTAMP:20260828T094430Z UID:4o3fib360hk7hvgl0nkump6bpm@google.com CREATED:20220401T135721Z DESCRIPTION:The Sound of Quantum Mechanics
    Konrad Lehn ert\, \; JILA\, NIST and CU Boulder
     \;
    In the past decade a new technology domain of quantum sound has emerged. Unlike electrical and o ptical systems\, which are governed by fundamental equations of electromagn etism\, acoustical and vibrational phenomena are described by the equations of elastic waves in solid bodies. They are subject to different limitation s and can reach different regimes of behavior. Sound is different. The spee d of sound in a solid material is 100\,000-fold slower than light\, elastic waves do not propagate through vacuum\, and they can couple to atom-like s ystems through strain rather than electrical or magnetic dipole interaction s. These facts have consequences for quantum information science that we ha ve yet to fully understand. In his talk\, I will describe the emergence of this new branch of quantum science\, showing both striking demonstrations o f quantum sound and highlighting potential applications. In particular\, I will demonstrate the dual wave-particle nature of phonons and discuss how q uantum acoustics might be the key enabling technology for quantum communica tion networks.     LAST-MODIFIED:20220401T143125Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T110000 DTEND;TZID=America/New_York:20210125T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g@google.com RECURRENCE-ID;TZID=America/New_York:20210125T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Quantum Photonics in the Frequency D omain

    Speaker: Alexander Gaeta\, Columbia University

    Abstract: Quantum frequency conversion is the proce ss by which the wavelength of a light field is converted to another wavelen gth while still fully maintaining its quantum state. \; We describe our recent research that utilizes the nonlinear optical process of four-wave m ixing to perform ultralow noise quantum frequency conversion with efficienc ies approaching 100%. \; We also show how this nonlinear process can be used to realize other novel quantum phenomena in the frequency domain incl uding Hong-Ou-Mandel interference\, near-deterministic single-photon genera tion\, single-photon Ramsey interference\, and temporal magnification of si ngle-photon pulses.

    LAST-MODIFIED:20210120T224752Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210322T203000Z DTEND:20210322T213000Z DTSTAMP:20260828T094430Z UID:5cb1e8eu51k78lqushohkrci9n@google.com CREATED:20210308T173139Z DESCRIPTION:Title: Measurement of Low-energy Cosmic-Ray Electron and Positr on Spectra with the AESOP-Lite balloon-borne Spectrometer

    Speaker: J ohn Clem\, University of Delaware

    Abstract: A new measurement of the Cosmic-Ray Electron and Positron spectra in the energy range of 20 MeV–1 G eV will be presented. The data were taken during the first flight of the ba lloon-borne spectrometer Anti Electron Sub-Orbital Payload (AESOP-Lite)\, which was flown from Esrange\, Sweden\, to Ellesmere Island\, Canada\, in May 201 8. The payload collected over 130hrs of exposure at an average altitude of 3g/cm^2. The instrument incorporates a gas Cerenkov detector and a magnetic spectrometer to identify particle type and measure the energy. The primary CR spectra of electrons and positrons\, as well as the re-entrant albedo f luxes\, were extracted between 20 MeV and 1 GeV.

    Notes: Visit \; https://bit.ly/2PmJoT6 \;for acces s LAST-MODIFIED:20210308T173139Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T110000 DTEND;TZID=America/New_York:20211122T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211122T110000 CREATED:20210708T004621Z DESCRIPTION:All-optical coherent control of solid-state spin qubits toward quantum photonic applications

    Speaker: Demitry Farfurnik
    Institution: UMD

    Abstract: Optically-active spins in the solid-stat e are useful resources for quantum technologies. The coupling of such syste ms to photonic structures can generate deterministic spin-photon entangleme nt\, which could contribute to quantum simulations and networking. Ideal sp in systems for such applications must combine high quality spin and photoni c properties\, as well as efficient methods for the coherent manipulation o f the spin state. While common methods for controlling the quantum state of spin qubits utilize microwave fields\, such methods become challenging in many optically-active spin systems that exhibit low g-factors. In this talk \, I will introduce an alternative method\, based on a two-photon Raman exc itation\, for coherently manipulating spins in systems for which microwave control is challenging. I will present our all-optical approach for perform ing noise spectroscopy of solid-state spins\, which leverages such Raman-ba sed control to implement pulse sequences inspired by nuclear magnetic reson ance. Such realization of noise spectroscopy allowed us to directly probe t he high frequency (up to 100 MHz) noise spectra of single electrons confine d in an InAs/GaAs quantum dots\, in agreement with theoretical models that consider the hyperfine interaction of such electrons with an ensemble of nu clear spins broadened by strain. After discussing the noise spectra of InAs /GaAs quantum dots\, I will introduce additional systems with promising spi n and optical properties that we plan to study using similar noise spectros copy approaches. Finally\, I will present our research directions on the co upling of spins to fabricated photonic structures. Combining such coupling with all-optical coherent control could enable the realization of novel pul se sequences for high resolution sensing\, quantum information processing a nd quantum networking.


    Trajectory entanglement and samplin g complexity of jump outcomes induced by monitoring dissipative processes


    Speaker: Mathias Van Regemortel

     Institition: UMD

    Abstract: \;Studying the effect of local projective measurements on the scaling of entanglement entropy is an intense topic of research in the context of meas urement-induced phase transitions. While it is traditionally studied in dis crete circuit models\, a close continuous-time analogy can be drawn with mo nitored open quantum dynamics\, where a record of the registered quantum-ju mp clicks allows one to reconstruct the pure-state stochastic trajectories. I will first show how monitoring a cavity array with two competing protoco ls\, one generating coherence and the other performing a weak number measur ement\, induces an entanglement scaling transition for the trajectory state s across a critical point. While for this problem the associated master equ ation of the open system is not invariant\, I will illustrate next that sol ely changing the monitoring protocol of the same dissipative processes can also have an impact on the stochastic trajectory dynamics. In this setup\, the quantum jumps of spontaneous emission are monitored after passing throu gh a linear interferometer\, affecting both the scaling of trajectory entan glement entropy and the hardness of sampling the click outcomes. We show&nb sp\;that this problem is equivalent to the famous problem of Fock-state bos on sampling. \; LAST-MODIFIED:20220617T080647Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210929T150000Z DTEND:20210929T191500Z DTSTAMP:20260828T094430Z UID:2ljkihh3qhobkotdj8o2k6oj0r@google.com CREATED:20210914T153528Z DESCRIPTION:Speaker: Robert Butera\, Laboratory for Physical Sciences -&nbs p\;https://www.lps.umd.edu/

    T itle: Building Chemistry Approaches for Outstanding Challenges in Quantum C omputing

    Abstract: TBA


    Virtual: \;go.umd.edu/pchem_seminars LAST-MODIFIED:20210921T143725Z LOCATION:IPST Bldg. #085\, Room 1116 (In person) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - Virtual/In-person TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210615T140000Z DTEND:20210615T150000Z DTSTAMP:20260828T094430Z UID:1qsbjq9e9ncmkvl5num8j6a1vs@google.com CREATED:20210601T151817Z DESCRIPTION:Title: Fermion Sampling: a robust quantum computational advant age scheme using fermionic linear optics and magic input states
    Speaker: Michał Oszmaniec (Center for Theoretical Physics\, Polish Academy of Scie nces)
    Time: Tuesday\, June 15\, 2021 - 10:00am
    Location: Virtual Vi a Zoom: https://zoom.us/j/95104727535?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz0 9

    Fermionic Linear Optics (FLO) is a restricted model of quantum computation which in its original form is known to be efficiently classica lly simulable. We show that\, when initialized with suitable input states\, FLO circuits can be used to demonstrate quantum computational advantage wi th strong hardness guarantees. Based on this\, we propose a quantum advanta ge scheme which is a fermionic analogue of Boson Sampling: Fermion Sampling with magic input states.

    We consider in parallel two classes of cir cuits: particle-number conserving (passive) FLO and active FLO that preserv es only fermionic parity and is closely related to Matchgate circuits intro duced by Valiant. Mathematically\, these classes of circuits can be underst ood as fermionic representations of the Lie groups U(d) and SO(2d). This ob servation allows us to prove our main technical results. We first show anti concentration for probabilities in random FLO circuits of both kind. Moreov er\, we prove robust average-case hardness of computation of probabilities. To achieve this\, we adapt the worst-to-average-case reduction based on Ca yley transform\, introduced recently by Movassagh\, to representations of l ow-dimensional Lie groups. Taken together\, these findings provide hardness guarantees comparable to the paradigm of Random Circuit Sampling.

    I mportantly\, our scheme has also a potential for experimental realization. Both passive and active FLO circuits are relevant for quantum chemistry and many-body physics and have been already implemented in proof-of-principle experiments with superconducting qubit architectures. Preparation of the de sired quantum input states can be obtained by a simple quantum circuit acti ng independently on disjoint blocks of four qubits and using 3 entangling g ates per block. We also argue that due to the structured nature of FLO circ uits\, they can be efficiently certified.

    Reference: Oszmaniec\, Mic hał\, et al. "Fermion Sampling: a robust quantum computational advantage sc heme using fermionic linear optics and magic input states." arXiv preprint arXiv:2012.15825 (2020).

    This talk is part of the \;IQC-QuICS Math and Computer Science Semin ar. LAST-MODIFIED:20210603T154236Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T173000Z DTEND:20211201T200000Z DTSTAMP:20260828T094430Z UID:6aeg48oj4l76oqqii0rkbrmaeo@google.com CREATED:20211119T151659Z DESCRIPTION:Speaker Name: Scott Dodelson

    Speaker Institution : Carne gie Mellon University

    Title : "Cosmic Structure With and Beyond the Dark Energy Survey"

    Abstract : There is now a well-defined fiducial model of the universe – “Lambda-CDM” – that accounts for almost all observa tional data. In particular\, we now have a compelling story of how the stru cture in the universe formed\, how “we got here.” The model itself though i s theoretically precarious\, depending on 2 or 3 pieces that have not been observed on Earth and\, indeed\, may not exist. I report on attempts to str ess-test this model with the largest optical survey of its kind\, the Dark Energy Survey\, presenting results from the first 3 years of data. Then\, I speculate on one new idea for probing structures on the largest scales\, a probe that could lead to even tighter tests and/or new models that are mor e compelling.

    Notes: Virtual lunch at 12:30 PM\, virtual talk at 1:3 0 PM

    Zoom information:
    https://zoom.us/j/96801941719?pwd=< wbr>Wm16MnplYzJYVTZ4K1BocE80Yndxdz09 \;(Meeting ID: 968 0194 1 719\, with Passcode: 1866)

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211119T151659Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210419T200000Z DTEND:20210419T210000Z DTSTAMP:20260828T094430Z UID:7b7evph8p3sjie95vmhvkf6msc@google.com CREATED:20210219T140112Z DESCRIPTION:Speaker: Spencer Chang\, University of Oregon

    Title: Hig gs couplings measurements and the scale of new physics

    Abstract: An ongoing goal of particle colliders is measuring the Higgs
    couplings to S tandard Model particles. As I will demonstrate in this
    talk\, any obser ved deviation from the SM predictions for these
    couplings is a sign of n ew physics whose energy scale can be bounded
    from above by imposing pert urbative unitarity. This allows
    quantitative connections between a futu re coupling measurement and its
    impact on new physics\, similar to how u nitarity predicted the Higgs to
    be less than a TeV in mass. A nontrivia l consequence of these results
    is that different Higgs couplings have pa rametrically different power
    in constraining new physics\, e.g. the stri ngent constraints on hZZ\,
    hWW couplings still allow values that could r equire new physics to
    below 3 TeV. Another interesting consequence is t hat for a Higgs
    coupling deviation to set a unitarity bound much higher than a TeV
    requires Higgs coupling correlations as in the Standard Model
    Effective Field Theory\, showing that generic Higgs couplings requires< br>new physics below ~ few TeV.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210414T211631Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T150000Z DTEND:20211013T161500Z DTSTAMP:20260828T094430Z UID:17k8hkh1b2ml3jq4ro0o3vsose@google.com CREATED:20210914T154602Z DESCRIPTION:Speaker: Nicholas Fisher\, Fourkas Group

    Title: Literatu re Seminar

    Abstract: TBA LAST-MODIFIED:20210914T154602Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211102T170000Z DTEND:20211102T181500Z DTSTAMP:20260828T094430Z UID:1gf2lkjsdim1aehrb94u7612il@google.com CREATED:20210913T183640Z DESCRIPTION:Speaker: Armita Nourmohammad\, University of Washington

    Title: \;Adaptive Immunity in Light of Host-Pathogen Coevolution

    Abstract: \;The adaptive immune system consists of highly diverse B an d T cells whose unique surfacereceptors enables them to mount specific resp onses against a multitude of pathogens. Adaptive immunity incorporates all aspects of life\, from molecular signaling to cellular evolution. The resul t is an information processing molecular organization with many interacting components\, which can reliably sense and adaptively respond to diverse an d evolving pathogens. With the growing amount of molecular data\, we can no w quantify the sequence diversity generated in immune repertoires. However\ , we still lack an understanding of how such diversity translates to immune function. In this talk\, I will introduce a principled statistical framewo rk to integrate interpretable biophysical models of immune receptor generat ion with flexible and powerful deep learning approaches to characterize seq uence determinants of immune receptor function. Apart from these data-drive n approaches\, I will establish a theoretical framework to characterize the organization and encoding of information in the adaptive immune system to counter the out of equilibrium evolutionary drive that a host experiences f rom pathogens. These approaches will shed light on how the diversity of imm une repertoires shape functional responses to ever- changing pathogenic env ironments.

    When: \;1:15pm (An informal pre-seminar cha t with the speaker\, to which all are invited\, will be held at 1:00pm).

    Where: \;https://go. umd.edu/statphys_zoom

    LAST-MODIFIED:20211028T193534Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T180000Z DTEND:20211210T190000Z DTSTAMP:20260828T094430Z UID:1qb844thd5e4j1qb4dgn4g30q6@google.com CREATED:20210914T151514Z DESCRIPTION:Speaker: Nandita Abhyankar\, Assistant Research Scientist\, UMD \, IREAP/NIST

    Title: Electron Spin Resonance Spectroscopy for Micro-Structural Analysis of Sub-Nanoliter Volume Samples

    Ab stract: \;https://mse.umd.edu/event/16534/mse-seminar-series-ele ctron-spin-resonance-spectroscopy-for-micro-structural-analysis LAST-MODIFIED:20211202T142943Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220920T170000Z DTEND:20220920T180000Z DTSTAMP:20260828T094430Z UID:6m44nfksobnrjdkhmg3sium9oe@google.com CREATED:20220908T142547Z LAST-MODIFIED:20220908T142547Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211206T110000 DTEND;TZID=America/New_York:20211206T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211206T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Stephan Schlamminger\, NIST \n\nTitle: Mechanical meas urements of small forces\n\nAbstract: The absolute and precise measurement of small forces and torques is a difficult task. I will give examples of sm all forces from several research topics\, for example\, measuring the gravi tational constant\, photon pressure forces\, and new ways to calibrate torq ue screwdrivers. Several techniques\, their strengths\, but also their pitf alls will be illuminated. Thus\, the audience will learn several valuable a nd fun metrological tools and gain an appreciation of the usefulness of the se measurements to advance physics and society.\n\nHost: Eite Tiesinga LAST-MODIFIED:20220617T080608Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210325T140000 DTEND;TZID=America/New_York:20210325T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201208T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:02m9gb23jfvmf9r2m7imi3fuoi@google.com CREATED:20210124T203625Z DESCRIPTION:Speaker: Darrell Schlom\, Cornell University\n\n\nTitle: TBA\nA bstract:\n\n\nHost: TBA\nFor the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210124T203625Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Darrell Schlom\, Cornell University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211021T180000Z DTEND:20211021T190000Z DTSTAMP:20260828T094430Z UID:7u7f4p7ii0j6hr3da4avdvls9r@google.com CREATED:20211005T151133Z DESCRIPTION:Title: Clifford groups are not always 2-designs\nSpeaker: Mat thew Graydon (University of Waterloo )\nTime: Thursday\, October 21\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/9302519 4699?pwd=bjVJZVpIQXJkS1U2aXg2d3Q3QVhBdz09\n\nA group 2-design is a unitary 2-design arising via the image of a suitable compact group under a projecti ve unitary representation in dimension d. The Clifford group in dimension d is the quotient of the normalizer of the Weyl-Heisenberg group in dimensi on d\, by its centre: namely U(1). In this talk\, we prove that the Cliffo rd group is not a group 2-design when d is not prime. Our main proofs rely\ , primarily\, on elementary representation theory\, and so we review the es sentials. We also discuss the general structure of group 2-designs. In part icular\, we show that the adjoint action induced by a group 2-design splits into exactly two irreducible components\; moreover\, a group is a group 2- design if and only if the norm of the character of its so-called U-Ubar rep resentation is the square root of two. Finally\, as a corollary\, we see th at the multipartite Clifford group (on some finite number of quantum system s) also often fails to be a group 2-design.\n\nThis talk is based on joint work with Joshua Skanes-Norman and Joel J. Wallman\; arXiv:2108.04200 [quan t-ph]. LAST-MODIFIED:20211005T151133Z LOCATION:https://uwaterloo.zoom.us/j/93025194699?pwd=bjVJZVpIQXJkS1U2aXg2d3 Q3QVhBdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Matthew Graydon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T193000Z DTEND:20211103T203000Z DTSTAMP:20260828T094430Z UID:5ghbqtua0l5v62jaqt5qvn0phq@google.com CREATED:20211101T182915Z DESCRIPTION:Title : Quantum reference frames for indefinite metrics: fallin g through masses in superposition

    Speaker Name: Prof. Časlav Brukner
    Speaker Institution : University of Vienna

    Abstract : The curren t theories of quantum physics and general relativity alone do not allow us to study situations where the gravitational source is a quantum. In particu lar\, it is still unclear what the gravitational field sourced by mass conf iguration in a spatial superposition looks like and how other objects move in its vicinity. In my talk\, I will propose a strategy that allows us to a ddress this question using quantum reference frames (QRF). In particular\, I will show that in a typical situation it is possible to change to a QRF i n which the mass configuration is definite\, and apply standard quantum mec hanics on a fixed spacetime background to determine the evolution of test p articles in the presence of this fixed gravitational source. By applying th e inverse QRF transformation to the time-evolved state\, we find the trajec tory of the test particles in the original frame where the mass configurati on is in superposition. Our results may pave a fruitful path to establishin g conceptual grounds for a future theory of quantum gravity.

    Host Na me: Kim Nakia Pinckney-Lewis
    Host E-Mail: \;kimpl@lps.umd.edu LAST-MODIFIED:20211101T182915Z LOCATION:Laboratory for Physical Sciences via WebEx\; contact host SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquia / Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T160000Z DTEND:20220420T170000Z DTSTAMP:20260828T094430Z UID:0c5f8utrqj391heg3f1a02te3j@google.com CREATED:20220207T165209Z LAST-MODIFIED:20220207T165209Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210308T210000Z DTEND:20210308T220000Z DTSTAMP:20260828T094430Z UID:05ioqbjmug8h0immltjrle1l3k@google.com CREATED:20210111T170645Z DESCRIPTION:

    Title: Activity of G-protein coupled receptor is ther modynamically linked to lipid solvation

    Speaker: Alison Leonar d\, Postdoctoral Fellow at University of Delaware

    Hosted by: J effery Klauda

    Abstract: \;

    Preferential lipid solvat ion of the G-protein coupled A2A \;adenosine receptor (A2AR) is evaluat ed from 35 \;sec of all-atom molecular dynamics simulation. A coarse-gr ained transition matrix algorithm is developed to overcome slow equilibrati on of the first solvation shell\, obtaining estimates of the free energy of solvation by different lipids for the receptor in different activation sta tes. Results indicate preference for solvation by unsaturated chains\, whic h favors the active receptor. A model for lipid-dependent GPCR activity is proposed in which the chemical potential of lipids in the bulk membrane mod ulates receptor activity. \;The entropies associated with moving sat urated and unsaturated lipids from bulk to A2AR's first solvation shell are evaluated. Overall\, the acyl chains are more disordered (i.e.\, obtain a favorable entropic contribution) when partitioning to the receptor surface\ , and this effect is augmented for the saturated chains which are relativel y more ordered in bulk. \; \;

    Join Zoom Meeting:

    Time: \;March 8\, \;2021 \;@ 4:00PM Eastern Time (US and Canada) \;  \;
    https:// umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT 09
    Meeting ID: 926 8220 2606
    Passcode: 741889


    LAST-MODIFIED:20210204T204518Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220407T123000 DTEND;TZID=America/New_York:20220407T140000 DTSTAMP:20260828T094430Z UID:7h00ho737srmmhugt5dklv91t3@google.com RECURRENCE-ID;TZID=America/New_York:20220407T123000 CREATED:20220308T204846Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

    Speaker: \;Lena Funcke\, MIT

    Title: Machine Learning for Th ermodynamic Observables in Lattice Field Theories

    Abstract: In this talk\, I will discuss how applying machine learning techniques to lattice f ield theory is a promising route for solving problems where Markov Chain Mo nte Carlo (MCMC) methods are problematic. More specifically\, I will show t hat deep generative models can be used to estimate thermodynamic observable s like the free energy\, which contrasts with existing MCMC-based methods t hat are limited to only estimate free energy differences. I will demonstrat e the effectiveness of the proposed method for two-dimensional $\\phi^4$ th eory and compare it to MCMC-based methods in detailed numerical experiments . This talk is based on work with Kim Nicoli and others\, PRL 126\, 032001 (2021).
     LAST-MODIFIED:20220404T175018Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T180000Z DTEND:20210909T193000Z DTSTAMP:20260828T094430Z UID:7779t56t1eoa141ijpe5knp5ge@google.com CREATED:20210923T174521Z DESCRIPTION:Speaker: TBA\n\n\nTitle: TBA\nAbstract:\n\n\nHost: TBA\n \nNote : there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210923T174522Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T180000Z DTEND:20211130T190000Z DTSTAMP:20260828T094430Z UID:1544inefe6ldc94mkivvolr7qs@google.com CREATED:20210913T184519Z LAST-MODIFIED:20210913T184519Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210930T150000Z DTEND:20210930T163000Z DTSTAMP:20260828T094430Z UID:254p76pbbvvm9fjl5g9b113li5@google.com CREATED:20210831T185529Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Balint Toth\, Wuppe rtal

    Title: A lattice QCD perspective on the muon g-2


    Abs tract: The anomalous magnetic moment of the muon is one of the most
    prec isely measured physical quantities. Comparing its experimental
    value to the theoretical prediction of the Standard Model (SM)
    provides a stringe nt test of SM\, and a possible disagreement can
    indicate new physics. Th e Fermilab team has recently announced their
    precise measurement for thi s magnetic moment\, reporting a 4.2 sigma
    significance for new physics\, and raising the tantalizing possibility
    of physical particles or forces as yet undiscovered. However\, an
    extensive new calculation of the theo retically most controversial
    contribution\, the leading order hadronic v acuum polarization
    contribution\, using lattice QCD by the
    Budapest-M arseille-Wuppertal-collaboration\, reduces the gap between
    theory and ex periment. In this talk I will summarize the theoretical
    aspects\, and gi ve details on the lattice calculation. LAST-MODIFIED:20210922T132800Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T150000Z DTEND:20211006T161500Z DTSTAMP:20260828T094430Z UID:1b90gu0v8fc97c2293tqhos4t1@google.com CREATED:20210914T154401Z DESCRIPTION:Speaker: Kishalay Mahato\, Fourkas Group

    Title: The Dete rmination of Stimulated Emission Cross-Section from Fluorescence Signal

    Abstract: TBD LAST-MODIFIED:20210929T143745Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220310T123000 DTEND;TZID=America/New_York:20220310T140000 DTSTAMP:20260828T094430Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220310T123000 CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

    Speaker: Caroline Robin\, Universitat Bielefeld

    Title: E ntanglement in nuclear structure calculations

    Abstract: In the past years\, increasing effort has been devoted to better understand the
    phen omenon of entanglement in quantum many-body systems\, due to its essential< br>role in quantum computing and potential guidance in formulating the many -body
    problem. While extensive investigations of this topic have already been performed in
    condensed matter\, atomic physics and quantum chemist ry\, the exploration of
    entanglement in nuclear systems has only recentl y begun.
    In this talk I will present studies of entanglement in the stru cture of light nuclei. In
    particular\, I will show how different entangl ement patterns can arise from different
    many-body calculation schemes\, and how such patterns are related to convergence
    of observables\, such a s the binding energy. I will also investigate how entanglement
    structure s can signal emergent properties and physical phenomena in the nuclei
    un der study. Finally\, I will discuss how such studies could lead to more eff icient
    many-body schemes\, and how they could benefit the development of quantum
    computations of nuclei.
     LAST-MODIFIED:20220308T161408Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T190000Z DTEND:20220411T203000Z DTSTAMP:20260828T094430Z UID:2dknhvbtetp9p2qjfssuvsleq2@google.com CREATED:20220120T151047Z DESCRIPTION:Speaker: Nicolás Fernández\, UIUC

    Title:
    Freeze-in\, glaciation\, and UV sensitivity from light mediators.

    Ab stract:
    Dark matter (DM) freeze-in through a light mediator is an appeal ing model with excellent detection prospects at current and future experime nts. Light mediator freeze-in is UV-insensitive insofar as most DM is produ ced at late times\, and thus the DM abundance does not depend on the unknow n early evolution of our universe.  \;However the final DM yield retain s a dependency on the initial conditions for the DM abundance\, which is us ually assumed to be exactly zero. We point out that in models with light me diators\, the final DM yield will also depend on the initial conditions ass umed for the light mediator population. We describe a class of scenarios we call “glaciation” where DM freezing in from the SM encounters a pre-existi ng thermal bath of mediators\, and study the dependence of the final DM yie ld on the initial temperature of this dark radiation bath. We quantify the dependence of the DM yield on the initial dark temperature and find that it can be sizeable in regions near the traditional (zero initial abundance) f reeze-in curve.  \;We generalize the freeze-in curve to a glaciation ba nd\, which can extend as much as an order of magnitude below the traditiona l freeze-in direct detection target\, and point out that the DM phase space distribution as well as the yield can be strongly dependent on initial con ditions.
     LAST-MODIFIED:20220406T200207Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210311T210000Z DTEND:20210311T220000Z DTSTAMP:20260828T094430Z UID:026o1iio0u7m9llcnhtoj31gt0@google.com CREATED:20210112T220919Z DESCRIPTION:**Joint UMD/ Cornell Seminar**

    Speaker: Nathaniel Craig\, UCSB

    Title: Optimal Transport for Particle Physicists
    Abstract: The theory of optimal transport — motivated by minimizing the ` `work’’ required to rearrange one distribution into another — has found wid espread application in PDEs\, geometry\, \;statistics\, economics\, ima ge processing\, and machine learning. Recently applied to particle physics\ , the theory of optimal transport provides a new perspective on \;colli der observables\; implies inequalities satisfied nonperturbatively by these observables\; and enables the definition of a ``distance'' \;between t heories. From a practical perspective\, optimal transport defines \;new quantities associated with collider \;events that can \;be used as input to machine learning algorithms \;and leveraged in collider analy ses. In this talk\, I’ll provide an overview of optimal transport relevant for particle physics\, summarize recent foundational and practical developm ents\, and highlight promising future directions for the geometrization of collider physics.
    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210302T212540Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint UMD/ Cornell Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210922T200000Z DTEND:20210922T213000Z DTSTAMP:20260828T094430Z UID:78n78i6dl96g21c1vm3ds4usgt@google.com CREATED:20210920T184638Z DESCRIPTION:Zoom Information: \;https://umd.zoom.us/j/912108 47449?pwd=Y2prQW05S29EYjZlbHZLZkNSU0JHQT09 \;

    Pass word is 300061

    Title : "C^3: An Andvanced Concept for a e+e- Linear Collider"

    Speaker Name: Emilio Allessandro Nani
    Speaker Instituti on : Stanford University

    Abstract: The goal of a next-generation e+e - collider is to carry out precision measurements to the percent level of t he Higgs boson properties that are not accessible at the LHC and HL-LHC. In this talk we will present the study of a new concept for a high gradient\, high power accelerator with beam characteristics suitable to study the Hig gs boson\, the Cool Copper Collider (C^3)\, with the goal of minimizing the capital and operating costs. C^3 is based on the latest advances in rf acc elerator technology and utilizes optimized cavity geometries\, novel rf dis tribution and operation a cryogenic temperatures to allow the linear accele rator to achieve high accelerating gradients while maintaining overall syst em efficiency. We will present the latest demonstrated performance of proto type accelerators and highlight the future development path for C^3.

    Name: Sally Megonigal
    E-Mail: \;s megonig@umd.edu LAST-MODIFIED:20210920T193539Z LOCATION:Seminar will be virtual SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T183000Z DTEND:20211201T193000Z DTSTAMP:20260828T094430Z UID:2e7bvrmavqebh7eo706jlp7vta@google.com CREATED:20211007T170435Z DESCRIPTION:Seminar will be conducted via zoom.

    Preceded by a virtua l lunch at 12:30pm

    Speaker: Scott Dodelson\, Carnegie Mellon Univers ity

    Title: Cosmic Structure with and beyond the Dark Energy Survey
    Abstract: There is now a well-defined fiducial model of the universe – “Lambda-CDM” – that accounts for almost all observational data. In partic ular\, we now have a compelling story of how the structure in the universe formed\, how “we got here.” The model itself though is theoretically precar ious\, depending on 2 or 3 pieces that have not been observed on Earth and\ , indeed\, may not exist. I report on attempts to stress-test this model wi th the largest optical survey of its kind\, the Dark Energy Survey\, presen ting results from the first 3 years of data. Then\, I speculate on one new idea for probing structures on the largest scales\, a probe that could lead to even tighter tests and/or new models that are more compelling.

    F or zoom link please email mknouse@umd.edu< /a> LAST-MODIFIED:20211123T181633Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint JHU/UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220214T160000Z DTEND:20220214T170000Z DTSTAMP:20260828T094430Z UID:1bo88eegp2of28coktfres4jr4@google.com CREATED:20220121T183417Z DESCRIPTION:Speaker: Michael Huber\, National Institute of Stand ards and Technology

    Title: \;The Many Facets of Neutron Pendellö sung Interference

    Abstract: Neutron interferometry is practiced with de Broglie wavelengths of 0.1 nanometer over path lengths of 0.1 meter\, t ypically in Mach-Zehnder configurations familiar to practitioners of atom a nd optical interferometry. However\, since ordinary matter is largely trans parent to neutrons\, their interference can be manifested deep within mater ials. \; \;Neutrons undergoing Bragg diffraction experience a type of oscillation inside a crystal known as pendellösung interference [1] whic h results in a modulation of the forward-diffracted and Bragg-reflected int ensities. \; This phenomenon allows for the precise determination of th e neutron-silicon structure factor. \; Knowing the structure factor at several Bragg conditions strongly constraints possible atomic length scale interactions\; aka a "fifth" force. \; In addition\, structure factor m easurements probe the structure of the neutron via the neutron charge radiu s and provide information on thermal motion of the atoms in a lattice.  \;

    [1] "Pendellösung interferometry probes the neutron char ge radius\, lattice dynamics\, and fifth forces\," B. Heacock\, \;et al.\, \;Science \;373\, 1239 (2021)


    H ost: Charles Clark     LAST-MODIFIED:20220125T192134Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T200000Z DTEND:20211006T213000Z DTSTAMP:20260828T094430Z UID:51lbpif1qph1mqok9aceptbj73@google.com CREATED:20211001T160914Z DESCRIPTION:Speaker: Dan Zhang\, University of Maryland\n\n\nTitle : "Dark Matter Search in PandaX-4T Commissioning Run"\n\nAbstract : PandaX-4T exper iment searches for dark matter particles with a dual-phase time projection chamber holding 4 tonne liquid xenon in the sensitive volume. After the lab and detector construction for more than two years at China Jinping Undergr ound Laboratory\, PandaX-4T has begun to take scientific data since the end of the year 2020. In this talk\, I will give an overview of the PandaX-4T hardwares and the weakly interacting massive particles (WIMPs) search with our commissioning data\, including calibration\, signal reconstruction and profile likelihood ratio analysis. LAST-MODIFIED:20211001T160914Z LOCATION:Zoom Information: Zoom coordinates: https://umd.zoom.us/j/9121084 7449?pwd=Y2prQW05S29EYjZlbHZLZkNSU0JHQT09 passcode 300061 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220426T171500Z DTEND:20220426T181500Z DTSTAMP:20260828T094430Z UID:153msr0tetdpc270pkovs464ua@google.com CREATED:20220207T155526Z DESCRIPTION:Speaker: Professor Silvina Matysiak\, UMD

    Title: Effect of Physiological Environment on Neurodegenerative Peptide Aggregation

    Abstract: \;Molecular-level self-assembly/ag gregation processes are common in biomolecular systems. Specifically\, pept ide aggregation results in the formation of biomolecular deposits (amyloid) \, which has been associated with neuronal dysfunction leading up to neurod egeneration. Peptide aggregation is often influenced by several environment -derived entities\, which can modulate this pathological process in a speci fic or non-specific manner. In this talk\, I will present on the molecular mechanism of how the environment modulates amyloid aggregation with biomole cular simulations. To study this process at long spatial and temporal scale s\, we created and applied computational models at coarse-grained (CG) reso lution. Our CG models can capture the biophysics of environment-stimulated conformational transitions that are common with neurodegenerative peptides.  \;Experimentally it has been observed that lipid membrane surfaces\,&n bsp\;hyperglycemic conditions \;and components of the extracellular mat rix can modulate in different ways amyloid formation and the aggregate morp hology. In this presentation\, I will describe the molecular mechanism of h ow crowding\, membrane curvature\, peptide-lipid and peptide-polysaccharide /monosaccharides interactions tune the emergence of different amyloid peptide aggregation kinetics and morphologies.


    LAST-MODIFIED:20220421T125632Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T183000Z DTEND:20220427T193000Z DTSTAMP:20260828T094430Z UID:4qsv3jegca5cla4npi7snn7a5s@google.com CREATED:20220427T172129Z DESCRIPTION:Title: Slicing duality and holographic cosmology

    Abs tract: I will outline a recent proposal (    https://arxiv.org /abs/2203.11220) for a holographic description of cosmological s pacetimes with negative cosmological constant in AdS/CFT correspondence. Th e microscopic Euclidean theory has a double reflection symmetry and involve s two 3D holographic CFTs coupled by non-holographic auxiliary 4D degrees o f freedom on a strip. The bulk dual Euclidean path integral is dominated by a 4D Euclidean wormhole with two asymptotic AdS boundaries coupled by the non-gravitational auxiliary theory. Two different slicings of the microscop ic Euclidean path integral are possible. This corresponds to two slicings o f the Euclidean wormhole\, defining two different Lorentzian spacetimes rel ated by double analytic continuation. The first one is a Big Bang - Big Cru nch FLRW cosmological universe\; the second one is an AdS eternal traversab le wormhole. I will describe the relationship between cosmological observab les and observables in the traversable wormhole geometry. This "slicing dua lity" allows one to probe the cosmological universe using the usual AdS/CFT dictionary even though the cosmology has no asymptotic boundary. Finally\, I will comment on the possibility of having phases of accelerated cosmolog ical expansion driven by time-varying scalar fields. LAST-MODIFIED:20220427T172129Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Stefano Antonini\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T171500Z DTEND:20220503T181500Z DTSTAMP:20260828T094430Z UID:73757hpmfqi6o9ue8uim8jpo21@google.com CREATED:20220207T155816Z DESCRIPTION:Speaker: Dr. Monica Olve ra de la Cruz\, Northwestern University

    Title: Metalli zation of Colloids

    Abstract: \;    Numerous collo idal crystals have been designed and devised following
    design rules akin to atomic crystals. I will review techniques using functionalization
    an d/or electrostatic interactions in mediating interactions among nanoparticl es. I will
    discuss the resulting properties of the crystals including tr ansport mediated by a
    localization to delocalization transition (LDT) in mixtures of asymmetric in size
    nanoparticles where the small nanopartic les roam the crystal holding the large
    nanoparticles in specific lattice s sites\, akin to electron clouds in atomic metals. The
    LDT\, when disco ntinuous\, is driven by lattice vibrations. It is observed in many systems\ ,
    including atomic system\, such as superionics\, where it is known as s ublattice melting. LAST-MODIFIED:20220429T125018Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T150000Z DTEND:20220420T160000Z DTSTAMP:20260828T094430Z UID:55bmob7701nfn1j7scbkneinob@google.com CREATED:20220207T163948Z LAST-MODIFIED:20220418T210908Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210427T171500Z DTEND:20210427T181500Z DTSTAMP:20260828T094430Z UID:6aeebki65deqtlanqbacp9d6dl@google.com CREATED:20210202T180438Z DESCRIPTION:Speaker: Dr. Andrew Ballard\, Google Deep Mind\n\nTitle: Optimi zing Free Energy Estimation with Machine Learning\n\nAbstract: It has been almost 70 years since Zwanzig developed Free Energy Perturbation (FEP) [1]\ , and since then it has become a bedrock technique for estimation of free e nergy differences. But convergence of FEP is often poor\, as the estimator demands the relevant states share a significant overlap in configuration sp ace. One strategy to address this requirement is Targeted Free Energy Pertu rbation [2]\, which employs a configuration-space mapping to increase an ef fective overlap. For it to be effective\, however\, the mapping must incorp orate correct physical intuition that leads to increased overlap -- a diffi cult task for complex\, high-dimensional systems.\n\nIn this talk I will de scribe how Machine Learning can be employed to learn an effective mapping i n an automated way [3]. I will describe normalizing flows [4]\, generative models that are particularly well-suited to represent the mapping. Finally\ , I will show how our approach behaves on a prototypical solvation system\, employing a novel normalizing flow that respects periodic boundary conditi ons and permutational symmetry of identical particles. Our technique leads to significant error reduction in free energy estimates compared to baselin es\, without requiring additional data.\n\n[1] R. W. Zwanzig\, J. Chem. Phy s. 22\, 1420 (1954)\n[2] C. Jarzynski\, Phys. Rev. E 65\, 046122 (2002)\n[3 ] P. Wirnsberger et al\, J. Chem. Phys. 153\, 144112 (2020)\n[4] D.J. Rezen de et al\, PMLR 37:1530-1538\, (2015) LAST-MODIFIED:20210421T181439Z LOCATION:Zoom: https://go.umd.edu/statphys_spring2021 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T110000 DTEND;TZID=America/New_York:20210830T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211215T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210906T110000 EXDATE;TZID=America/New_York:20211011T110000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com CREATED:20210708T004621Z DESCRIPTION:Speaker:\n\nTitle: \nAbstract: \n\nHost: LAST-MODIFIED:20210708T004927Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T160000Z DTEND:20220406T170000Z DTSTAMP:20260828T094430Z UID:1g0is62584qlrp7n2h8f135d3q@google.com CREATED:20220207T165118Z DESCRIPTION:Speaker: Hyunseok Oh\, Postdoctoral Associate\, C. Cem Tasan Re search Group\, Massachusetts Institute of Technology

    Title: How Can Alloy Design Push Limits? Making Sense and Use of Complexity

    Abstrac t: Over the last century\, the compositional and microstructural complexiti es of alloys have dramatically increased in response to accelerating demand s for component safety\, efficiency\, and resistance to harsh environments. However\, resulting multi-scale interactions that govern the engineering p roperties can rarely be explained by practical and well-established methods such as mean-field averaging\, which renders alloy design an empirical tri al-and-error undertaking.

    In this seminar\, Dr. Oh will introduce my rese arch approach to overcoming property trade-offs in alloys. This approach ha rnesses compositional/microstructural complexities\, using both metallurgic al principles and in-situ characterization techniques. First\, he will pres ent the development of a Ni-V alloy\, which exhibits a far greater strength -ductility combination than any other existing face­ centered cubic complex -concentrated alloys (CCAs)\, by using a simple parameter: electronegativit y difference. Second\, he will highlight a precipitation-hardened martensit ic stainless steel\, which achieves improved ductility without sacrificing strength by introducing austenite grains that remain as strong as the marte nsitic matrix they are embedded in. Third\, he will discuss the Co-Ni-Cr-N CCAs exhibiting a desirable plasticity mechanism change (from martensitic t ransformation to faulting) induced by short-range ordering. These investiga tions demonstrate how blending metallurgical principles with in-situ charac terization techniques can produce generic design guidelines to effectively explore the immense degrees of freedom in compositional and microstructural space and achieve superior property combinations.

    Bio:

    Hyunseo k Oh is currently a postdoctoral associate in the Department of Materials S cience and Engineering at Massachusetts Institute of Technology (advisor: P rof. C. Cem Tasan). He received B.Sc. and Ph.D. degrees in the Department o f Materials Science and Engineering from Seoul National University in South Korea (advisor: Prof. Eun Soo Park). During his Ph.D. he was also a visiti ng student in the Microstructure Physics and Alloy Design department at Max -Planck-lnstitut fur Eisenforschung (Germany). Hyunseok's research is focus ed on understanding and utilizing fundamentals of the process-structure-pro perty correlations in metals\, with particular emphasis on atomic- and micr o-scale behaviors\, to design advanced engineering alloys.

    LAST-MODIFIED:20220331T183201Z LOCATION:CHE 2110 and via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T160000Z DTEND:20211201T171500Z DTSTAMP:20260828T094430Z UID:5mlrb1vn15loq09nllptkanc1j@google.com CREATED:20211122T232123Z DESCRIPTION:Title: Simulating conformal field theories\nSpeaker: Tobias Os borne (Leibniz Universität Hannover)\nTime: Wednesday\, December 1\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd= VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 (ID: 9893676372\, passcode: abc123)\n\nWha t does it mean to simulate a quantum field theory? This is a challenging qu estion because a majority of the quantum field theories relevant to fundame ntal physics lack a fully rigourous mathematical definition. Thus it is imp ossible in general to compare the predictions of discretised theories with their continuum counterparts. I will discuss these challenges and advocate the use of the recently introduced operator algebraic renormalization (OAR) as a means to provide both classical and quantum simulations of quantum fi eld theories\, in particular\, conformal theories. The OAR naturally provid es a direct mechanism to compare predictions from a cutoff lattice with a t arget continuum theory. LAST-MODIFIED:20211122T232124Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3F Cblk4aFdTMjkzTllvQT09 (ID: 9893676372\, passcode: abc123) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Tobias Osborne TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T193000Z DTEND:20211208T203000Z DTSTAMP:20260828T094430Z UID:6eoj8ejs2oprrc06k8h0l1kcie@google.com CREATED:20211202T152246Z DESCRIPTION:Speaker Name: Alexis Marret

    Speaker Institution : Sorbon ne/Paris Observatory

    Title : The non-resonant streaming instability: from theory to experiments

    Abstract : on the kinetic energy of the particles collective streaming motion. Of the different streaming instabili ties\, the non-resonant mode has received growing attention as it can ampli fy the magnetic field well beyond its initial intensity\, and generate the necessary turbulence to help confine and accelerate cosmic rays in supernov ae remnants and young stellar jets shocks. In general\, it can develop in a large variety of environments\, ranging from the cold and dense molecular clouds to the hot and diffuse intergalactic medium.

    This work aims a t elucidating the behaviour of the non-resonant cosmic rays streaming insta bility in such environments\, where thermal and collisional effects can sub stantially modify its growth and saturation. To study the instability in ho t environments\, where finite Larmor radius effects are important\, we reso rt to linear kinetic theory and extend the existing analytical results to t he case of decoupled ions and magnetic perturbations. We find that the unst able wavelengths are not entirely suppressed\, but are instead shifted towa rd larger scales with a strongly reduced growth rate.

    The linear the ory results are confirmed and extended to the non-linear evolution by using multi-dimensional hybrid-Particle-In-Cell simulations (kinetic ions and fl uid electrons). The simulations highlight an important reduction of the lev el of magnetic field amplification in the hot regime\, indicating that it m ay be limited in hot astrophysical plasmas such as in superbubbles or the i ntergalactic medium. In colder and denser environments\, such as H II regio ns and molecular clouds\, particle collisions in the background plasma must be taken into account. We investigate numerically their impact by includin g Monte-Carlo Coulomb and neutral collisions in the simulations. We find th at the instability is rapidly suppressed in poorly ionized plasmas. In cont rast\, we find that in fully ionized plasmas\, Coulomb collisions unexpecte dly favour the development of the instability by reducing self-generated pr essure anisotropies that would otherwise oppose its growth.

    Numerica l simulations are currently the only means to investigate the non-linear ev olution of the instability and to obtain quantitative estimates of the satu rated magnetic field intensity. The final part of this work is devoted to a nswer the growing need for an experimental verification of the linear theor y and simulations predictions. We describe some of the requirements on the plasma parameters to generate the instability in an experiment\, and propos e two preliminary setups based on existing high-power laser facilities\, ai ming at observing and characterizing the non-resonant mode for the first ti me in the laboratory.

    Name: Marc Swisdak
    E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211202T152246Z LOCATION:Contact swisdak@umd.edu for the Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210504T171500Z DTEND:20210504T181500Z DTSTAMP:20260828T094430Z UID:6tn2orhkpb6smessk9ofvkkgto@google.com CREATED:20210202T180532Z DESCRIPTION:Speaker: Dr. Joan-Emma Shea\, UC Santa Barbara

    Title:  \;Fibrillization and Liquid-Liquid Phase Separation of the Tau Pep tide

    Abstract: Intrinsically disordered peptides(IDP) are a special class of proteins that do not fold to a uniquethree-dimensional shape. Thes e proteins play important roles in the cell\, fromsignaling to serving as s tructural scaffolds. Under pathological conditions\,they can self-assemble into structures that are toxic to the cell\, and a numberof neurodegenerati ve diseases are associated with this self-assembly process.My talk will foc us on the Tau protein\, an IDP that binds to microtubules andcan form fibri llar aggregates\, a process that has been linked with Alzheimer’sdisease. I n addition to forming fibrils\, the Tau protein can also phaseseparate into a protein rich and a protein depleted phase\, a process known asliquid-liq uid phase separation (LLPS). This process may play a protective rolein the cell against pathological fibrillization. I will present moleculardynamics and field theoretic simulations that map out the phase diagram for TauLLPS\ , and use this phase diagram to predict the conditions under which Tau canb e driven towards LLPS under live cell coculturing conditions. LAST-MODIFIED:20210503T211702Z LOCATION:https://go.umd.edu/statphys_spring2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211109T160000Z DTEND:20211109T170000Z DTSTAMP:20260828T094430Z UID:613cm7n8drq714pf531c3uacq9@google.com CREATED:20211025T165505Z DESCRIPTION:Speaker: Kyle Kawagoe (University of Chicago)
    Loca tion: Zoom
    Title: A Bulk-Boundary Correspondence for 2D Fermi onic Symmetry Protected Topological Phases
    Abstract: A universal property of symmetry protected topological (SPT) phases is that they have l ow energy boundary modes that are protected under the symmetry. This fact i nspires an important problem in the theory of SPT phases: How does one iden tify a bulk SPT phase given a low energy theory of its boundary? This quest ion is particularly challenging in the case of interacting SPT phases where band theory approaches are inapplicable. In this talk\, we present a gener al method for solving this problem in the case of (2+1) D interacting fermi onic systems with internal (non-spatial) symmetries.
    Host: Yu-An Chen

    Email emartin3@umd.edu for Zoom details LAST-MODIFIED:20211025T165505Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210709T140000Z DTEND:20210709T160000Z DTSTAMP:20260828T094430Z UID:45968hbldlbun2lh1qm1238pp8@google.com CREATED:20210625T164225Z DESCRIPTION:Title: The complexity of simulating quantum physics: dynamics and equilibrium
    Speaker: Abhinav Deshpande (QuICS)
    Time: Friday\, Jul y 9\, 2021 - 10:00am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/91579244863 Meeting ID: 915 7924 4863

    Quantum computing is the offspring of quantum mechanics an d computer science\, two great scientific fields founded in the 20th centur y. Quantum computing is a relatively young field and is recognized as havin g the potential to revolutionize science and technology in the coming centu ry. The primary question in this field is essentially to ask which problems are feasible with potential quantum computers and which are not. In this d issertation\, we study this question with a physical bent of mind. We apply tools from computer science and mathematical physics to study the complexi ty of simulating quantum systems. In general\, our goal is to identify para meter regimes under which simulating quantum systems is easy (efficiently s olvable) or hard (not efficiently solvable). This study leads to an underst anding of the features that make certain problems easy or hard to solve. We also get physical insight into the behavior of the system being simulated.

    In the first part of this dissertation\, we study the classical com plexity of simulating quantum dynamics. In general\, the systems we study t ransition from being easy to simulate at short times to being harder to sim ulate at later times. We argue that the transition timescale is a useful me asure for various Hamiltonians and is indicative of the physics behind the change in complexity. We illustrate this idea for a specific bosonic system \, obtaining a complexity phase diagram that delineates the system into eas y or hard for simulation. We also prove that the phase diagram is robust\, supporting our statement that the phase diagram is indicative of the underl ying physics.

    In the next part\, we study open quantum systems from the point of view of their potential to encode hard computational problems. We study a class of fermionic Hamiltonians subject to Markovian noise desc ribed by Lindblad jump operators and illustrate how\, sometimes\, certain L indblad operators can induce computational complexity into the problem. Spe cifically\, we show that these operators can implement entangling gates\, w hich can be used for universal quantum computation. We also study a system of bosons with Gaussian initial states subject to photon loss and detected using photon-number-resolving measurements. We show that such systems can r emain hard to simulate exactly and retain a relic of the ``quantumness'' pr esent in the lossless system.

    Finally\, in the last part of this dis sertation\, we study the complexity of simulating a class of equilibrium st ates\, namely ground states. We give complexity-theoretic evidence to ident ify two structural properties that can make ground states easier to simulat e. These are the existence of a spectral gap and the existence of a classic al description of the ground state. Our findings complement and guide effor ts in the search for efficient algorithms. LAST-MODIFIED:20210625T164330Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Abhinav Deshpande TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210916T150000Z DTEND:20210916T163000Z DTSTAMP:20260828T094430Z UID:5l39c8kvvoie5b23s94vh9vvpq@google.com CREATED:20210819T143413Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Matthias Schindler\ , University of South Carolina

    Title: Nucleon-nucleon interactions a nd the large-Nc expansion: Applications to symmetry violations and neutrino less double beta decay


    Abstract: The large-Nc expansion of QCD c an be applied to the nucleon-nucleon interactions. The relative sizes of di fferent terms in a general parametrization of the standard nucleon-nucleon potential match reasonably well with large-Nc expectations. I will present extensions of this approach to parity- and time-reversal-invariance-violati ng interactions\, magnetic and axial two-nucleon currents\, and to two-nucl eon operators contributing to neutrinoless double beta decay. In each case\ , the large-Nc expansion imposes constraints on the relative sizes of the l ow-energy coefficients that contribute to a given type of interaction. In t he absence of sufficient data\, these constraints may prove useful in guidi ng both experiment and theory in prioritizing where to focus our efforts to gain a better understanding of these interactions. LAST-MODIFIED:20210907T140241Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T163000Z DTEND:20220505T173000Z DTSTAMP:20260828T094430Z UID:6l3pe4rtoqg9evlab9shijg2jk@google.com CREATED:20220504T190825Z DESCRIPTION:Seminar will be Conducted via zoom: https://umd.zoom.us/j/94067038750

    Sp eaker: \;Sonia Bacca\, Mainz

    Title: Electroweak reactions with n uclei

    Abstract:
    Electroweak reactions with nuclei are key observa ble to study: not only
    are they relevant to nuclear physics\, but they a lso allow to connect to other field of physics\, such as particle physics.< br>
    Beyond the lightest nuclear systems\, a first principle computation of electroweak reactions in terms of protons and neutrons interacting with external fields is complicated by the fact that the probe can break the nuc leus into many clusters\, leading to several simultaneously open reaction c hannels. A way to circumvent this problem is to use integral transforms.
    Recently\, we provided a coupled-cluster theory formulation of the Lorentz integral transform\, obtaining a many-body method that allows to compute e lectroweak reactions and related observable in the medium-mass nuclei. I wi ll show some of our recent results and connect them to modern topics of nuc lear physics\, as well as neutrino physics.     LAST-MODIFIED:20220504T190825Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211015T170000Z DTEND:20211015T180000Z DTSTAMP:20260828T094430Z UID:2qpbt9romuf4ldo1ei00qfdb94@google.com CREATED:20210914T145928Z DESCRIPTION:Speaker: Carles Corbella\, Professor\, Mechanical & Aerospace E ngineering\, George Washington University\n\nTitle: Synthesis of Nanomateri als by Atmospheric Arc Plasmas\n\nAbstract: The Micro-Propulsion and Nanote chnology Laboratory at the George Washington University is aimed to expand the understanding of plasma and nanoscale phenomena. The research is based on three plasma-related applications: (1) propulsion by micro-thrusters\, ( 2) plasma medicine to address cell migration and cancer therapy\, and (3) p lasma-based nanotechnology. After a brief introduction to each line\, I wil l focus on nanotechnology research and the application of atmospheric plasm as to synthesize nanomaterials like graphene\, carbon nanotubes\, and MoS2 monolayers. The plasma-healing effect of anodic arc discharges and the inve stigation of pulsed arcs to tailor nanoparticle growth constitute the up-to -date highlights of the research line. The next challenge is the production of advanced nanostructures with tunable electrical and optical properties using arc plasma and other environmentally friendly techniques. LAST-MODIFIED:20210914T145928Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220802T171500Z DTEND:20220802T181500Z DTSTAMP:20260828T094430Z UID:685afuoinjc0lisiq4minb1d23@google.com CREATED:20220724T031210Z DESCRIPTION:Title: Noncommuting charges: Bridging theory to exp eriment
    Speaker: Shayan Majidy (University of Waterloo\, IQC)
    Time: Tuesday\, August 2\, 2022 - 1:15pm
    Location: IPST 1116

    Noncommu ting conserved quantities have recently launched a subfield of quantum ther modynamics. In conventional thermodynamics\, a system of interest and an en vironment exchange quantities—energy\, particles\, electric charge\, etc.—t hat are globally conserved and are represented by Hermitian operators. Thes e operators were implicitly assumed to commute with each other\, until a fe w years ago. Freeing the operators to fail to commute has enabled many theo retical discoveries—about reference frames\, entropy production\, resource- theory models\, etc. Little work has bridged these results from abstract th eory to experimental reality. This paper provides a methodology for buildin g this bridge systematically: we present a prescription for constructing Ha miltonians that conserve noncommuting quantities globally while transportin g the quantities locally. The Hamiltonians can couple arbitrarily many subs ystems together and can be integrable or nonintegrable. Our Hamiltonians ma y be realized physically with superconducting qudits\, with ultracold atoms \, and with trapped ions.

    Yunger Halpern\, Nicole\, and Shayan Majid y. &\;quot\;How to build Hamiltonians that transport noncommuting charge s in quantum thermodynamics.&\;quot\; npj Quantum Information 8.1 (2022) : 1-7.


    Note: Brown -bag lunch at the seminar room before the talk.
     LAST-MODIFIED:20220726T162632Z LOCATION:IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical-Physics Seminar: Shayan Majidy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211018T203000Z DTEND:20211018T213000Z DTSTAMP:20260828T094430Z UID:6ju1anj7glnm4envuthlumnafi@google.com CREATED:20210925T210946Z DESCRIPTION:Title: Atmospheric muon measurements and prompt muon sensitivit y study for KM3NeT

    Speaker: Piotr Kalaczynski\, National Centre for Nuclear Research\, Warsaw\, Poland

    Abstract: The K M3NeT Collaboration has successfully deployed a number of detection uni ts of the next generation undersea neutrino telescopes in the Mediterranean Sea at the two sites in Italy and in France. The data sample collected bet ween December 2016 and January 2020 has been used to measure the atmospheri c muon rate at two different depths under the sea level: 3.5 km with KM3NeT ARCA and 2.5 km with KM3NeT-ORCA. Atmospheric muons represent an abundant s ignal in a neutrino telescope and can be used to test the reliability of th e Monte Carlo simulation chain and to study the physics of extensive air sh owers caused by highly-energetic primary nuclei impinging the Earth’s atmos phere. At energies above PeV the contribution from prompt muons\, created r ight after the first interaction in the shower\, is expected to become domi nant\, however its existence has not yet been experimentally confirmed. In this talk\, data collected with the first detection units of KM3NeT are com pared to Monte Carlo simulations based on MUPAGE and CORSIKA codes. The mai n features of the simulation and reconstruction chains are presented. Addit ionally\, the first results of the simulated signal from the prompt muon co mponent for KM3NeT-ARCA and KM3NeT-ORCA obtained with CORSIKA are discussed .

    Notes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20210925T210946Z LOCATION:Via Zoom. Visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T203000Z DTEND:20221109T223000Z DTSTAMP:20260828T094430Z UID:02jnri24nlgckoj8qbh4pifa5r@google.com CREATED:20220815T131303Z DESCRIPTION:Speaker: TBA

    Title: TBA

    Abstract: < b>TBA     LAST-MODIFIED:20220815T131303Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210921T170000Z DTEND:20210921T181500Z DTSTAMP:20260828T094430Z UID:2t2e9n5iahuk25t8aeljfnj077@google.com CREATED:20210913T141552Z DESCRIPTION:Speaker: David Sivak\, Simon Fraser University

    Title: In formation Thermodynamics of the Transition-Path Ensemble

    Abstract: T he reaction coordinate describing a transition between reactant and product is a fundamental concept in the theory of chemical reactions. Within trans ition-path theory\, a quantitative definition of the reaction coordinate is found in the committor\, which is the probability that a trajectory initia ted from a given microstate first reaches the product before the reactant. Here we develop an information-theoretic origin for the committor and show how selecting transition paths from the equilibrium ensemble induces entrop y production which exactly equals the information that system dynamics prov ide about the reactivity of trajectories. This equality of entropy producti on and dynamical information generation also holds at the level of arbitrar y individual coordinates\, providing parallel measures of the coordinate's relevance to the reaction\, each of which is maximized by the committor.&nb sp\;

    Where: \;https://go.umd.edu/statphys_zoom LAST-MODIFIED:20210914T125840Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211118T140000 DTEND;TZID=America/New_York:20211118T153000 DTSTAMP:20260828T094430Z UID:7e32v5dj8kg84fh3s0aoksijf1@google.com RECURRENCE-ID;TZID=America/New_York:20211118T140000 CREATED:20210924T122545Z DESCRIPTION:

    Title:

    Materials discovery of next-gene ration quantum materials\, the AV3Sb5 \;(A: K\, R b\, Cs) kagome superconductors

    Abstract:

    New materials d iscovery has been a fundamental part of the synthetic chemistry\, condensed matter physics\, and materials fields. The targeted synthesis of new terna ry and quaternary compounds has immense potential for introducing new chemi cal complexity and diversity into the known model systems. Our discovery of the AV3Sb5 \;(A: K\, Rb\, Cs) kagome superconduc tors is a prime example of how rational exploration of phase space can lead to untold opportunity. The AV3Sb5 \;materials ar e quasi-2D (structurally and electronically)\, exfoliatable\, air-stable\, metals with a structurally perfect kagome network of vanadium. The entire f amily exhibits competition between charge density wave (CDW) order below (8 0-100K)\, and a superconducting (Tc = 0.9-2.5K) ground state. Our work indi cates that the systems are topologically nontrivial\, and surface states sh ould be close to the natural Fermi level. A complex interplay between the e lectronic properties and the CDW is observed\, with the possibility of a ch iral CDW as the source of anomalous Hall effect in the entire family. In th is seminar I will describe the rapidly growing body of knowledge surroundin g the AV3Sb5 \;system\, including potential topol ogical surface states\, unconventional superconductivity\, and interplay of charge density wave order and superconductivity.


    Host: Paglione

    VIRTUAL ZOOM SEMINAR: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220617T080640Z LOCATION:Virtual: https://umd.zoom.us/j/91301075848 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Brenden Ortiz\, UC Santa Barbara TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T160000Z DTEND:20220307T170000Z DTSTAMP:20260828T094430Z UID:6vdmfopgrofov1ojd935k9j8n9@google.com CREATED:20220121T183450Z DESCRIPTION:Speaker: David Weiss\, Pennsylv ania State University

    Title: \;Dynamics in 1D Bose gases

    Abstract: \;I will describe the theory of generalized hydrodynamics (GH D)\, which allows the dynamics of nearly integrable many-body quantum syste ms to be accurately modeled. GHD has two assumptions: the continuum approxi mation and local equilibration to the Generalized Gibbs ensemble (GGE).&nbs p\; We use bundles of 1D Bose gases to test GHD and show that the theory wo rks remarkably well for quite a long time after even very large trap quench es and even for as few as 10 atoms per 1D gas. \; We have also performe d wavefunction quenches. For some time after such a quench the GGE is not s atisfied\, so GHD cannot be applied. \; As a function of density and co upling strength\, we experimentally study this time\, for which there are n ot robust theoretical predictions.

    Host: Charles Clark     LAST-MODIFIED:20220317T195424Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220907T150000Z DTEND:20220907T160000Z DTSTAMP:20260828T094430Z UID:61foi0cfgunmgmetfv36mauv26@google.com CREATED:20220816T011136Z DESCRIPTION:Title:  Stellar representation of quantum computations
    Speak er:  Ulysse Chabaud (Caltech)
    Time:  Wednesday\, September 7\, 2022 - 11 :00am
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/951 24188987?pwd=c3FWQ1BLLzlwZ014Q21KYy9XRmt1dz09 Meeting ID: 951 2418 8987 Passcode: 386063

    We study the stellar representation of quantum com putations\, based on holomorphic functions\, which delineates the boundary between discrete- and continuous-variable quantum information theory. This representation provides an elegant characterization of non-Gaussian quantum states that are resourceful for bosonic quantum computing: in the single-m ode case\, the evolution of a single bosonic mode under a Gaussian Hamilton ian can be described using a dynamical system of classical particles corres ponding to the non-Gaussian zeros of the holomorphic function\; in the mult imode case\, this holomorphic representation also induces a faithful and ro bust non-Gaussian hierarchy of quantum states. From this representation\, w e obtain a classification of subuniversal bosonic models that are generalis ations of Boson Sampling and Gaussian quantum computing.

    arXiv:2111. 00117\, joint work with Saeed Mehraban. LAST-MODIFIED:20220816T011136Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95124188987? pwd=c3FWQ1BLLzlwZ014Q21KYy9XRmt1dz09 Meeting ID: 951 2418 8987 Passcode: 38 6063 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Ulysse Chabaud TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T150000Z DTEND:20211020T161500Z DTSTAMP:20260828T094430Z UID:4svjkp9h9hg5itk32kp8kig9tc@google.com CREATED:20211013T135016Z DESCRIPTION:Title: Nonequilibrium phases of matter on NISQ hardware
    Spe aker: Matteo Ippoliti (Stanford University)
    Time: Wednesday\, October 20\, 2021 - 11:00am
    Location: (In-person) ATL 3100A and Virtual Via Zoom : https://umd.zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz 09

    Recent progress on noisy\, intermediate scale quantum (NISQ) devices opens exciting opportunities for many-body physics. NISQ platforms are indeed not just computers\, but also interesting laboratory systems in their own right\, offering access to large Hilbert spaces with exceptional capabilities for control and measurement. I will argue that nonequilibrium phases in periodically-driven (Floquet) systems are a particularly good fit for such capabilities in the near term. Focusing on the paradigmatic examp le of the "discrete time crystal" (DTC)\, I will review the idea of eigenst ate order\, wherein many-body localization allows the definition of phase s tructure away from thermal equilibrium. I will then discuss how an eigensta te-ordered DTC can be studied on NISQ hardware [1]\, and present recent exp erimental work in which these ideas are implemented on Google Quantum AI's superconducting qubit processor [2]\, giving a scalable blueprint for NISQ- era studies of nonequilibirum phases of matter.

    [1] MI\, K. Kechedzh i\, R. Moessner\, S. Sondhi\, V. Khemani\, PRX Quantum 2\, 030346 (2021)
    [2] X. Mi\, MI\, C. Quintana\, A. Greene et al. (Google Quantum AI and col laborators)\, arXiv:2107.13571 (2021) LAST-MODIFIED:20211015T235552Z LOCATION:(In-person) ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j /2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Matteo Ippoliti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T150000Z DTEND:20220331T160000Z DTSTAMP:20260828T094430Z UID:6rjjdbho50mhumbelm50ud1u4h@google.com CREATED:20220207T175634Z DESCRIPTION:Speaker: Dr. Nagarjuni Gavvalapalli\, Georget own University

    Title: Controlled Synthesis of \;π-Conjugated Mat erials Beyond 1D

    Abstract: Extension of π-conjugation beyond 1-dimen sion results in materials with novel optical\, electronic\, and optoelectro nic properties. However\, strong π-π intermolecular interactions hamper sol ution phase synthesis of 2D-π-conjugated materials (e.g. graphene)\, induce aggregation of dispersed graphene sheets\, and make it challenging to cont rol the growth morphology (1D\, 2D or 3D) of π-conjugated microcrystals. A common theme in the Gavvalapalli group is controlled synthesis of higher di mensional π-conjugated materials using novel building blocks. My talk is di vided into two parts.

    Part-1 focuses on developing π-face masked ary l monomers to generate soluble 1D- and 2D-π-
    conjugated materials withou t pendant solubilizing chains. We used aryl repeat units containing \;< em>cycloalkyl straps     \;to synthesize high molecular weight soluble 1D- and 2D-π-conjugated strapped materials without pendant solubilizing ch ains. Cycloalkyl straps mask the polymer π-face and therefore reduce interc hain π-π interactions. The unique advantages rendered by the \;cycl oalkyl straps \;enabled diverse materials including soluble conjug ated microporous polymers and 1-D polymers with spatially controlled bindin g sites.

    Part-2 focuses on developing novel \;aryl amphiphil es \;and using them as morphology directors to
    control π-conjug ated microcrystal growth along the π-stacking direction to realize novel gr owth
    morphologies. We have shown that the aryl amphiphiles’ aryl hydroph obe geometry and size play a key role in determining the π-stacking facet g rowth rate and morphology and result in hitherto unknown microcrystal morph ologies with high π-stacking facet surface area. The rod shaped perylene mi crocrystals showed unprecedented exciton-polariton waveguiding along the ed ge-to edge packing direction of the perylene molecules.
    LAST-MODIFIED:20220327T160225Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211007T140000Z DTEND:20211007T150000Z DTSTAMP:20260828T094430Z UID:03cjq2th3v6j4eggagt1p6u44p@google.com CREATED:20210930T233700Z DESCRIPTION:Title: Bounding quantum capacities via partial orders and comp lementarity\nSpeaker: Christoph Hirche (Technische Universität München and National University of Singapore)\nTime: Thursday\, October 7\, 2021 - 10 :00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91230236736?pwd=U k5zalFSTnZUQnhZQkFaN0ZnL05XUT09\n\nCalculating quantities such as the quant um or private capacity of a quantum channel is a fundamental\, but unfortun ately a generally very hard\, problem. A well known class of channels for w hich the task simplifies is that of degradable channels\, and it was later shown that the same also holds for a potentially bigger class of channels\, the so called less noisy channels. Based on the former\, the concept of ap proximately degradable channels was introduced to find bounds on capacities for general channels. We discuss how the idea can be transferred to other partial orders\, such as less noisy and more capable channels\, to find pot entially better capacity bounds. Unfortunately these are not necessarily ea sy to compute\, but we show how they can be used to find operationally mean ingful bounds on capacities that are based on the complement of the quantum channel and might give a deeper understanding of phenomena such as superad ditivity. Finally\, we discuss how the framework can be transferred to quan tum states to bound the one-way distillable entanglement and secret key of a bipartite state. LAST-MODIFIED:20211005T152008Z LOCATION:https://umd.zoom.us/j/91230236736?pwd=Uk5zalFSTnZUQnhZQkFaN0ZnL05X UT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Christoph Hirche TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220502T150000Z DTEND:20220502T160000Z DTSTAMP:20260828T094430Z UID:6qdj2tjkmjd7lc34p6ecfmr3nv@google.com CREATED:20220121T183554Z DESCRIPTION:Speaker: Ana Asenjo-Garcia\, Columbia University

    Title: \;Universality of Dicke superradiance in atomic arrays
    Abstract: \;Tightly packed ordered arrays of atoms exhibit remarkable collective optical properties\, as dissipation in the form of photon emiss ion is correlated. In this talk\, I will discuss the many-body out-of-equil ibrium physics of atomic arrays\, and focus on the problem of Dicke superra diance\, where a collection of excited atoms synchronizes as they decay\, e mitting a short and intense pulse of light. Superradiance remains an open p roblem in extended systems due to the exponential growth of complexity with atom number. I will show that superradiance is a universal phenomenon in o rdered arrays\, and generically occurs if the inter-atomic distance is smal l enough. Our predictions can be tested in state of the art experiments wit h arrays of neutral atoms\, molecules\, and solid-state emitters and pave t he way towards understanding the role of many-body decay in quantum simulat ion\, metrology\, and lasing.

    Host: Alicia Kollar     LAST-MODIFIED:20220215T143535Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210913T203000Z DTEND:20210913T213000Z DTSTAMP:20260828T094430Z UID:7a2rgh88uer827h6kg50leh1sb@google.com CREATED:20210828T021432Z DESCRIPTION:Title: On the Initiation Processes of Solar Flares and Coronal Mass Ejections

    Speaker: Jie Zhang\, Department of \;Physics and Astronomy\, George Mason University

    Abstract: Flares and coronal mas s ejections (CMEs) are both energetic phenomena originated in the Sun’s cor ona. Flares are manifested as a sudden\, in a time scale of minutes\, gener ation of electromagnetic radiations in all wavelengths\, while equally ener getic CMEs are shown as a large-scale eruption of an organized magnetic str ucture into the interplanetary space. It is well recognized that they are t he drivers of space weather that may have adverse effects on advanced techn ological systems in the space and on the ground. In this talk\, I will firs t reflect on the debate in the 1990s on “solar flare myth”\, which was abou t what is the true cause of space weather\, i.e.\, whether flares or CMEs. A comprehensive overview on our improved understanding about the relations between flares and CMEs will be presented\, thanks to the advancement in ob servations made by a series of modern space observatories\, including SOHO\ , SDO and STEREO. Very often\, it is found that the energetic process of a flare (e.g.\, increase of X-ray flux) and a CME (e.g.\, increase of CME vel ocity) is synchronized in time\; thus\, they can be collectively called a s olar eruption. On the other hand\, they can also occur independently\, name ly compact/confined flares and “stealthy” CMEs\, respectively. I will furth er discuss how such diversity of observed phenomena poses challenges to the oretical and numerical models of solar eruptions\, which are largely divide d into two camps depending on whether the eruption is triggered by magnetic reconnection or instability of magnetic flux ropes.

    Notes: Visit https://bit.ly /2PmJoT6 \;for access LAST-MODIFIED:20210828T022058Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210907T171500Z DTEND:20210907T181500Z DTSTAMP:20260828T094430Z UID:5m0oupunjrot7rvgivoepbhkcp@google.com CREATED:20210831T140056Z LAST-MODIFIED:20210831T140056Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20260828T094430Z UID:3rak9qecnp98fe7941hd5e1dka@google.com CREATED:20220121T163450Z DESCRIPTION:Speaker: Dr. B. Andrei Bernevig (Princ eton University)
    Zoom: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWUC9 zK2J0eXp1NzMvamtNZThDUT09
    Title: \;An Exact Map Betw een the TBG (and multilayers) and Topological Heavy Fermions \;
    A bstract: \;Magic-angle (θ=1.05∘) twisted bilay er graphene (MATBG) has shown two seemingly contradictory characters: the l ocalization and quantum-dot-like behavior in STM experiments\, and delocali zation in transport experiments. We construct a model\, which naturally cap tures the two aspects\, from the Bistritzer-MacDonald (BM) model in a first principle spirit. A set of local flat-band orbitals (f) centered at the AA-stacking regions are responsible to the localization. A set of extended topological conduction bands (c)\, which are at small energetic separation from the local orbitals\, are respo nsible to the delocalization and transport. The topological flat bands of t he BM model appear as a result of the hybridization of \;f- and \;c-electrons. This model then provi des a new perspective for the strong correlation physics\, which is now des cribed as strongly correlated \;f-electrons couple d to nearly free topological semimetallic \;c-elec trons - we hence name our model as the topological heavy fermion model. Usi ng this model\, we obtain the U(4) and U(4)×U(4) symmetries a s well as the correlated insulator phases and their energies. Simple rules for the ground states and their Chern numbers are derived. Moreover\, featu res such as the large dispersion of the charge \;±1 \ ;excitations and the minima of the charge gap at the \;Γ& nbsp\;point can now\, for the first time\, be understood both qualitatively and quantitatively in a simple physical picture. Our mapping opens the pro spect of using heavy-fermion physics machinery to the superconducting physi cs of MATBG. All the model’s parameters are analytically derived \;
    Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWUC9zK2J0eXp1NzMvamtNZThDUT09
    Host: Jiabin Yu< br>

    Email emartin3@umd.edu for any additional questions.     LAST-MODIFIED:20220325T200459Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T210000Z DTEND:20211130T220000Z DTSTAMP:20260828T094430Z UID:0833uvu1kav9ck0d09mue7i13n@google.com CREATED:20211116T170030Z DESCRIPTION:Speaker: Ebony McGee\, Professor of Diversity and STEM Educatio n\, Peabody College of Education and Human Development\, Vanderbilt Univers ity

    Title: Dean's Voices of Inclusive Excellence Lecture Series - "B lack\, Brown\, Bruised: How Racialized STEM Education Stifles Innovation

     \;ABOUT THE TALK:

    Drawing on narratives from hundreds of Black\, Latinx\, and Indigenous individuals\, the speaker examines the exp eriences of underrepresented racially minoritized students and faculty memb ers who have succeeded in STEM. Based on this extensive research\, McGee ad vocates for structural and institutional changes to address racial discrimi nation\, stereotyping\, and hostile environments in an effort to make the f ield more inclusive. The lecture is based on \;McGee's bo ok\, of the same name\, which was published in 2020.

    ABOUT THE SPEAKER:
    Ebony McGee is a professor of diversity and STEM education at Vanderbilt University's Peabody College. She investigates what it means to be racially marginalized while minoritized in the context of learning a nd achieving in STEM higher education and in the STEM professions. She stud ies\, in particular\, the racialized experiences and racial stereotypes tha t adversely affect the education and career trajectories of underrepresente d groups of color. This involves exploring the social\, material\, and heal th costs of academic achievement and problematizing traditional forms of su ccess in higher education\, with an unapologetic focus on Black folk in the se places and spaces. Her NSF CAREER grant investigates how marginalization undercuts success in STEM through psychological stress\, interrupted STEM career trajectories\, impostor phenomenon\, and other debilitating race-rel ated trauma for Black\, Indigenous\, and Latinx doctoral students.

    Ed ucation is McGee's second career. She left a career in electrical engineeri ng to earn a Ph.D. in mathematics education from the University of Illinois at Chicago\, followed by a Spencer Postdoctoral Fellowship at the Universi ty of Chicago and a NSF Postdoctoral Fellowship at Northwestern University. She \;co-founded the \; Explorations in Diversifying Engineering Faculty Initiative \;and&n bsp\;the \;Institu te in Critical Quantitative and Mixed Methodologies Training for Underrepre sented Scholars \;(ICQCM)\, which aims to be a go-to resource for t he development of quantitative and mixed-methods skill sets that challenge simplistic quantifications of race and marginalization.

    This event is hosted and sponsored by the \;CMNS Diversity &\ ; Inclusion Advisory Council.

    If you have a question about this event\, please contact Abby Robinson at \;abbyr@umd.edu \;or 301-405-5845.

    NOTE: Recepti on held at 3:30pm


    LAST-MODIFIED:20211122T202143Z LOCATION:Bioscience Research Bldg.\, Room 1101\, 1st floor Atrium SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMNS Dean’s Voices of Inclusive Excellence Lecture Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T193000Z DTEND:20220504T203000Z DTSTAMP:20260828T094430Z UID:48ciemhjtb0pp7b3fkaa7mdg59@google.com CREATED:20220428T144519Z DESCRIPTION:
    Quantum error correction on a superconducting system w ith heavy hexagon topology
     
    Superconducting qubit based syst ems have made tremendous strides in device performance\, from improved cohe rences to lowered single- and two-qubit gate errors\, and high-fidelity mid -circuit measurements and qubit resets. In this talk\, I will present recen t progress towards fault tolerant quantum error correction on superconducti ng qubit systems that leverages the resources from improved device performa nce. I will focus on experimental demonstrations on a heavy-hexagon topolog y\, an arrangement that reduces lattice connectivity compared to other popu lar low-degree parity-check codes in order to mitigate cross-talk between f ixed-frequency transmon qubits. I will describe some of the encoding\, synd rome extraction\, and decoding operations that can be tailored to this topo logy focusing on d = 2 and 3 codes. The code design\, along with the curren t level of hardware noise\, place this system in a very favorable path for the coming years in the quest for scalable\, fault-tolerant quantum error c orrection. Our results and preliminary simulations highlight not only the v ersatility and flexibility of the underlying heavy-hexagon topology\, but a lso the importance of tailoring a decoder when implementing these protocols . 
     
    Maika Takita is a Research Staff Member at IBM Quantu m\, with expertise in experimental quantum computation. She joined IBM in 2 015 after completing her Ph.D. in Electrical Engineering from Princeton Uni versity. Takita specializes in the control\, characterization\, and benchma rking of multi-qubit quantum systems. As a co-PI of IARPA's LogiQ program\, she is also leading a team towards implementing fault tolerant quantum err or correction codes on superconducting qubit lattices
     

      
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    LAST-MODIFIED:20220428T144519Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=ma468e2adc502259d284daa69 bf364184 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar Series: Quantum error correction on a superconducting s ystem with heavy hexagon topology TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T160000Z DTEND:20211216T170000Z DTSTAMP:20260828T094430Z UID:04l4f546ngnjdlbi7b0o6huqql@google.com CREATED:20211206T172635Z DESCRIPTION:Location: ATL4402

    Speaker: Ryan Barnett (Imperial Colleg e London)

    Title: Polarons and Topological Effects in Ultracold Atomi c Gases

    Abstract: Ultracold atomic gases have proven to provide valu able platforms to simulate quantum systems arising in disparate areas of ph ysics. Polarons are well-studied quasiparticles in solid-state systems that describe an electron dressed by lattice distortions. The so-called Frohlic h model is the typical starting point for theoretically describing such sys tems. More recently\, polarons arising in Bose-Einstein condensates have be en the focus of much attention\, both theoretical and experimental. For suc h systems\, the Bogoliubov phonons play the role of the lattice vibrations of a solid. Furthermore\, by using a Feshbach resonance the strong and weak coupling regimes are readily accessed in experiments. In this talk\, I wil l describe a recent framework developed to understand Bose-polarons in ultr acold atomic gases. This framework incorporates the back action of the impu rity on the BEC at the mean field level and forms a natural starting point for incorporating quantum fluctuations. Time permitting\, I also hope to di scuss separate but related work describing topological band systems which c an arise in ultracold atomic gases. In particular\, I will discuss so-calle d local topological markers which can naturally be used to characterise top ological band systems that do not have translational invariance.

    Phys. Rev. Research 2\, 033142 (2020)

    arXiv:2111.07957< u>

    Phys. Rev. B 103\, 155134 (2021)

    For any question s email: em artin3@umd.edu

    LAST-MODIFIED:20211206T172635Z LOCATION:ATL 4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T160000Z DTEND:20220302T170000Z DTSTAMP:20260828T094430Z UID:5a3e7bi5l3kidpc5ij887fn191@google.com CREATED:20220207T173944Z DESCRIPTION:Speaker: Dr. Michael Pittelkow\, University of Copen hagen

    Title: Curved Aromatic Molecules and Anti-Aromatic Molecules
    Abstract: \;https://chem.umd.edu/events/curved-a romatic-molecules-and-anti-aromatic-molecules     LAST-MODIFIED:20220224T153749Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211018T190000Z DTEND:20211018T203000Z DTSTAMP:20260828T094430Z UID:4ek2jl9neuqggqgqkjcs6ahjot@google.com CREATED:20210823T122357Z DESCRIPTION:Speaker: Julian Munoz\, CfA\n\nTitle: 21-cm cosmology in 2021\ n\nAbstract: I will describe how to use the 21-cm line of hydrogen to learn about cosmology and particle physics. I will begin with an overview of the 21-cm signal during cosmic dawn and reionization\, and give an update of t he 2021 status of both theory and data. Then I will show three applications of 21-cm data for new physics. First\, how to use the depth of the signal to learn about anomalous cooling or heating due to dark-matter interactions \, and what the recent HERA measurements tell us about these scenarios. Sec ond\, I will show that the timing of this signal can be used to study DM at small scales and determine whether DM is cold\, warm\, or self interacting . Finally\, I will show how 21-cm provides us with a new standard ruler dur ing cosmic dawn\, at z=15-20\, which will bridge the gap in measurements of the expansion rate H(z) of our universe between the CMB and the local univ erse\, and shed light on potential resolutions to the H0 tension. LAST-MODIFIED:20211014T130123Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T150000Z DTEND:20220316T160000Z DTSTAMP:20260828T094430Z UID:2i7butld30i3fb4pvkt5n4eio0@google.com CREATED:20220207T163345Z LAST-MODIFIED:20220207T163345Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ChemPhys Joint Seminar - NO SEMINAR (APS MEETING) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T160000Z DTEND:20210910T164500Z DTSTAMP:20260828T094430Z UID:6p2dc5ffln23t8dbovs5r7fu3j@google.com CREATED:20210904T025653Z DESCRIPTION:Title: All-optical noise spectroscopy of a solid-state spin\nS peaker: Dima Farfurnik (JQI)\nTime: Friday\, September 10\, 2021 - 12:00p m\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119 207\n\nThe development of spin qubits with long coherence times for quantum information processing requires sources of spin noise to be identified and minimized. Although microwave-based spin control is typically used to extr act the noise spectrum\, this becomes infeasible when high frequency noise components are stronger than the available microwave power. Here\, we intro duce an all-optical approach for noise spectroscopy of spin qubits based on Raman spin rotation using Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences . By analyzing the resulting spin dynamics\, we extract the noise spectrum of a dense ensemble of nuclear spins interacting with a quantum dot\, which has thus far only been modelled theoretically. By extracting noise spectra under varying external magnetic fields\, our Raman-based analysis provides insights for extending the spin coherence times and predicts the spin dyna mics of quantum dots. This noise spectroscopy approach could provide simila r insights on other spin systems for quantum information processing.\n\nPiz za and drinks served after the talk. LAST-MODIFIED:20210904T025653Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Dima Farfurnik TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T150000Z DTEND:20220411T160000Z DTSTAMP:20260828T094430Z UID:3h25q2279hrcaq5566nqir9sg5@google.com CREATED:20220121T183530Z DESCRIPTION:Speaker: Nader Engheta\, Univer sity of Pennsylvania

    Title: \;Near-Zero-Index Optics
    < br>Abstract: Materials are often used to manipulate and control photons.&nb sp\; Metamaterials -- judiciously engineered material structures -- have en abled scientists and engineers to construct platforms with unconventional m aterial parameters\, providing exciting opportunities for optical and micro wave devices and components. One such platform is the near-zero-index metam aterials. \; In such structures\, the effective relative permittivity a nd/or relative permeability is designed to be near zero at operating freque ncies\, causing the effective refractive index to be near zero. \; Cons equently\, in such epsilon-near-zero (ENZ)\, mu-near-zero (MNZ)\, and/or ne ar-zero-index (NZI)structures the wavelength is “stretched”\, and therefore the phase distribution is effectively uniform throughout this volume.  \;This leads to a variety of unique features in wave physics including supe rcoupling\, photonic doping\, photonic surface states\, electric levitation \, extreme quantum optics\, thermal beaming\, and giant nonlinearity\, just to name a few. \; In this talk\, I will present an overview of some of the fundamental principles and unique physics and engineering of wave inte raction with such near-zero-index structures.  \;I will then discuss so me of the applications of such platforms in photonics and microwave technol ogies and in some quantum phenomena.  \;Possible future directions of r esearch in this field will also be forecasted.

    Short B io: Nader Engheta is the H. Nedwill Ramsey Professor at the University of P ennsylvania in Philadelphia\, with affiliations in the Departments of Elect rical and Systems Engineering\, Physics and Astronomy\, Bioengineering\, an d Materials Science and Engineering. \; He received his BS degree from the University of Tehran\, and his MS and Ph.D. degrees from Caltech. \ ; His current research activities span a broad range of areas including pho tonics\, metamaterials\, electrodynamics\, microwaves\, nano-optics\, graph ene photonics\, imaging and sensing inspired by eyes of animal species\, mi crowave and optical antennas\, and physics and engineering of fields and wa ves.

    He has received several awards for his research including the Isa ac Newton Medal and Prize from the Institute of Physics (UK)\, Max B orn Award from the OPTICA (formerly OSA)\, Ellis Island Medal of Honor\, IEEE Pioneer Award in Nanotechnology\, SPIE < i>Gold Medal\, the Balthasar van der Pol Gold Medal from the Internatio nal Union of Radio Science (URSI)\,the William Streifer Scientifi c Achievement Award from the IEEE Photonics Society\, induction to the Canadian Academy of Engineering as an International Fellow\, the Fellow of US National Academy of Inventors (NAI)\, the IEEE Electrom agnetics Award\, the Distinguished Achievement Award from the IE EE Antennas and Propagation Society\, the Vannevar Bush Faculty Fellowsh ip Award from DoD\, the Wheatstone Lecture in King’s College London\ , 2006 Scientific American Magazine 50 Leaders in Science and Technology\, and the Guggenheim Fellowship. \;

    He is a Fellow of n ine international scientific and technical organizations\, i.e.\, IE EE\, OPTICA\, APS\, MRS\, SPIE\, URSI\,AAAS\, IOP and NAI. \; He has re ceived the honorary doctoral degrees from the Aalto University in Finland i n 2016\, the University of Stuttgart\, Germany in 2016\, and Ukraine’s Nati onal Technical University Kharkov Polytechnic Institute in 2017.

    Host: C harles Clark     LAST-MODIFIED:20220311T213539Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210212T170000Z DTEND:20210212T174500Z DTSTAMP:20260828T094430Z UID:5ffcqing0kfldq3mheqf3buf0i@google.com CREATED:20210205T022528Z DESCRIPTION:Title : Floquet vortex states induced by ligh t carrying the orbital angular momentum
     \;
    Speaker : Iman Ahmadabadi

     \;
    Time : 12 - 12:45pm\, Friday\, Feb. 12
     \;
    Seminar will be held via Zoom: https://umd.zoom.us/j/97099328991 an d Meeting ID : 970 9932 8991 \;
     \;

    Abstract:
    W e propose a scheme to create electronic Floquet vortex states by irradiatin g the circularly-polarized laser light carrying non-zero orbital angular mo mentum on the two-dimensional semiconductor. We study the properties of the Floquet vortex states analytically and numerically using methods analogous to the techniques used for the analysis of superconducting vortex states\, while we exhibit that the Floquet vortex created in the current system has the wider tunability. To illustrate the impact of such tunability in quant um engineering\, we demonstrate how these vortex states can be used for qua ntum information processing. \;Following these findings and using numer ical results for wave functions and energy dispersions\, we calculate the f requency-dependent optical longitudinal and Hall conductivities via Kubo fo rmalism.     LAST-MODIFIED:20210205T022528Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS-JQI-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220609T140000Z DTEND:20220609T150000Z DTSTAMP:20260828T094430Z UID:1pki7kv2khnukvjmoidoepmqvq@google.com CREATED:20220530T024447Z DESCRIPTION:Title: Quantum simulations of topological Majorana modes
    Speaker: Oles Shtanko (IBM)
    Time: Thursday\, June 9\, 2022 - 10:00am
    Location: PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/79 84811536

    Quantum devices hold promise to outperform classical co mputers in performing some physical simulations in the nearest future\, mak ing them a valuable tool for physics research. In this talk\, Oles will foc us on quantum simulation of the topological states of matter hosting Majora na modes -- the exotic "half-electron" states. He will show the results obt ained from noisy quantum hardware provide us with accurate prediction of Ma jorana mode wavefunctions. This experiment also allows us to verify the top ological nature of observed modes. In addition\, he will demonstrate a new\ , non-adiabatic braiding method that enables us to obtain the exchange stat istics. Thus\, we establish the use of current cloud-based quantum simulati ons in studying topological many-body phenomena.     LAST-MODIFIED:20220609T215029Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Oles Shtanko TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220425T150000Z DTEND:20220425T160000Z DTSTAMP:20260828T094430Z UID:08sp5esbi496qrl2n4ga0c6g8v@google.com CREATED:20220121T183542Z DESCRIPTION:Speaker: Surjeet Rajendran\, Johns Hopkins Universit y

    Title: \;A Causal Framework for Non-Linear Quantum Mechanics
    Abstract: \;We add non-linear and state-dependent terms to quantu m field theory. We show that the resulting low-energy theory\, non-linear q uantum mechanics\, is causal\, preserves probability and permits a consiste nt description of the process of measurement. We explore the consequences o f such terms and show that non-linear quantum effects can be observed in ma croscopic systems even in the presence of de-coherence. We find that curren t experimental bounds on these non-linearities are weak and propose several experimental methods to significantly probe these effects. We also expose a fundamental vulnerability of any non-linear modification of quantum mecha nics - these modifications are highly sensitive to cosmic history and their locally exploitable effects can dynamically disappear if the observed univ erse has a tiny overlap with the overall quantum state of the universe\, as is predicted in conventional inflationary cosmology. We identify observabl es that persist in this case and discuss opportunities to detect them in co smic ray experiments\, tests of strong field general relativity and current probes of the equation of state of the universe. Non-linear quantum mechan ics also enables novel gravitational phenomena and may open new directions to solve the black hole information problem and uncover the theory underlyi ng quantum field theory and gravitation. \;

    Host: Ron Walsworth< /html-blob> LAST-MODIFIED:20220207T180838Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210208T213000Z DTEND:20210208T223000Z DTSTAMP:20260828T094430Z UID:64j4cnrhal29vng9oa8u2uvg3e@google.com CREATED:20210115T215743Z DESCRIPTION:Title: Understanding the Giant Planet Formation Process with Hi gh Spatial Resolution Observations

    Speaker: Jordan Stone\, Naval Res earch Laboratory

    Abstract: Understanding the planet formation proces s is a central goal of the exoplanet community. The giant-planet formation mechanism is especially important to understand because massive planets for m earliest\, and they dominate the dynamics and regulate material flow thro ugh planet forming disks. My work aims to inform theories of giant planet f ormation using high-spatial resolution techniques to isolate light from pla netary surfaces from the blinding light of their host stars. Spatially reso lved imaging facilitates detailed spectroscopic measurements of planetary a tmospheres revealing their composition. This is important because planetary composition can be related to formation location using the fact that tempe rature gradients in protoplanetary disks impose chemical gradients in the g as-phase disk material as different volatile species condense to solid phas es at different distances from the central star. I will discuss two project s that I lead to develop instruments for improving sensitivity to planets\, including a new fringe tracking camera for the LBT to enable 23 m direct imaging.

    Visit https://bit.ly/2PmJoT6 for access LAST-MODIFIED:20210115T215743Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T160000Z DTEND:20211110T171500Z DTSTAMP:20260828T094430Z UID:7kdrbhr87tvhimruc8421hode8@google.com CREATED:20211103T175829Z DESCRIPTION:Title: Grand unification of quantum algorithms\nSpeaker: Isaa c Chuang (MIT)\nTime: Wednesday\, November 10\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cGdHa205UW ptQXIxU3JvZz09\n\nModern quantum algorithms originate historically from thr ee disparate origins: simulation\, search\, and factoring. Today\, we can now understand and appreciate all of these as being instances of a single f ramework\, and remarkably\, the essence is how the rotations of a single qu antum bit can be transformed non-linearly by a simple sequence of operation s. On the face of it\, this is physically non-intuitive\, because quantum mechanics is linear. The key is to think not about eigenvalues and closed systems\, but instead\, about singular values and subsystem dynamics.\n\nJo in Zoom Meeting\nhttps://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cGdHa205UWpt QXIxU3JvZz09\nMeeting ID: 930 3338 3715\nPasscode: 849837\nOne tap mobile\n +13017158592\,\,93033383715#\,\,\,\,*849837# US (Washington DC)\n+192943628 66\,\,93033383715#\,\,\,\,*849837# US (New York)\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New Y ork)\n +1 312 626 6799 US (Chicago)\n +1 253 215 8782 US (Tac oma)\n +1 346 248 7799 US (Houston)\n +1 669 900 6833 US (San Jose)\nMeeting ID: 930 3338 3715\nPasscode: 849837\nFind your local number : https://umd.zoom.us/u/arJfzed0B\nJoin by SIP\n93033383715@zoomcrc.com\nJo in by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131. 7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterda m Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney )\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211 .144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\ n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.2 4.110 (Japan Osaka)\nMeeting ID: 930 3338 3715\nPasscode: 849837 LAST-MODIFIED:20211103T175829Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cG dHa205UWptQXIxU3JvZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Isaac Chuang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220309T160000Z DTEND:20220309T170000Z DTSTAMP:20260828T094430Z UID:0jsq0um7o684cf7s1ab10h8r2m@google.com CREATED:20220207T174447Z DESCRIPTION:Speaker: Meenal Jain\, UMCP

    Title: Macromolecular Crowdi ng in Living Systems

    Abstract: \;https://chem.umd.edu/events/macromolecular-crowding-living-systems LAST-MODIFIED:20220228T151259Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS/ANE/CHEMPHYS JOINT SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211102T160000 DTEND;TZID=America/New_York:20211102T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211102T160000 CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210507T180000Z DTEND:20210507T190000Z DTSTAMP:20260828T094430Z UID:0ni5oe447d0tlq1ggjtqmb0m92@google.com CREATED:20210202T163332Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Ronald Fernando Garcia Ruiz\, MIT

    Title: Designer Rad ioactive Atoms and Molecules for Nuclear Science \;

    Abstract: At oms and molecules containing radioactive nuclei - those with extreme proton -to-neutron ratios - can be artificially created to study particular nuclea r phenomena. Precision measurements of these systems can offer unique insig hts into the properties of the atomic nucleus\, nuclear matter\, and the fu ndamental particles and forces of nature. In this talk\, I will present rec ent highlights and perspectives from laser spectroscopy experiments of thes e exotic species. The relevance of these results to some of the long-standi ng questions of nuclear science will be discussed. LAST-MODIFIED:20210428T133122Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220706T150000Z DTEND:20220706T160000Z DTSTAMP:20260828T094430Z UID:77vfaceof477nivpo7eup8ho23@google.com CREATED:20220623T162116Z DESCRIPTION:Title:  Quantum information about unknown parameters can be compressed unboundedly without loss
    Speaker:  David Arvidsson-Shukur (Hitachi/University of Cambridge)
    Time:  Wednesday\, July 6\, 2022 - 11 :00am
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146


    Sev eral tasks in quantum-information processing involve quantum learning. For example\, quantum sensing\, quantum machine learning and quantum-computer c alibration involve learning and estimating unknown parameters from measurem ents of many copies of a quantum state that depends on those parameters. Th is type of metrological information is described by the quantum Fisher info rmation matrix\, which bounds the average amount of information learnt abou t the parameters per measurement of the state. In this talk\, I will show t hat the quantum Fisher information about parameters encoded in N copies of the state can be compressed into M copies of a related state\, where M <\ ;<\; N. I will show that  M/N can be made arbitrarily small\, and that th e compression can happen without loss of information. I will also demonstra te how to construct filters that perform this unbounded and lossless inform ation compression. Our results are not only theoretically important\, but a lso practically. In several technologies\, it is advantageous to compress i nformation in as few states as possible\, for example\, to avoid detector s aturation and/or to reduce post-processing costs. Our filters can reduce ar bitrarily the quantum-state intensity on experimental detectors\, while ret aining all initial information. I will discuss our recent experimental demo nstration of this. Finally\, I will prove that the ability to distil quantu m Fisher information is a non-classical advantage that stems from the negat ivity of a particular quasiprobability distribution\, a quantum extension o f a probability distribution.

    Join Zoom Meeting
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    Meeting ID: 41 1 109 9146
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    Meeting ID: 411 109 9146
    LAST-MODIFIED:20220623T162117Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: David Arvidsson-Shukur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210920T190000Z DTEND:20210920T203000Z DTSTAMP:20260828T094430Z UID:05jdg3u3setic6b4qcgb470bba@google.com CREATED:20210805T130601Z DESCRIPTION:Speaker: Manuel Buen-Abad\, UMD\n\nTitle: New developments in axion physics: challenges from the muon g-2 and echoes of supernova remnant s. \n\n\nAbstract: New physics around the weak scale could be behind the di screpancy between the muon g-2 measurement and the Standard Model predictio n. Loop effects coming from a heavy axion-like particle coupling to leptons and photons could explain this discrepancy. We provide an updated analysis of the necessary couplings\, including two-loop contributions\, and find t hat the new physics operators point to an axion decay constant on the order of 10s of GeV. This poses major problems for such an explanation\, as the axion couplings to leptons and photons must be generated at low scales. We outline some possibilities for how such couplings can arise\, and find that these scenarios predict new charged matter at or below the weak scale and new scalars that can mix with the Higgs boson\, raising numerous phenomenol ogical challenges. If time permits\, we will change tack and consider axion dark matter searches relying on its decays into photons\, stimulated by su pernova remnants. LAST-MODIFIED:20210913T175622Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T160000 DTEND;TZID=America/New_York:20211122T173000 DTSTAMP:20260828T094430Z UID:jkjo24susmror8foduuc6t6h2e@google.com RECURRENCE-ID;TZID=America/New_York:20211122T160000 CREATED:20210924T114034Z DESCRIPTION:Speaker: Heshan Yu


    Title: \;Combinatorial exploration of new phase-change memory materials with enhanced properties< br>
    Abstract: \;As one of the most promising candidates for d eveloping neuromorphic architectures for non-von Neumann computing and info rmation storage\, phase-change memory materials in both photonic and electr onic devices show non-volatile\, fast\, and multi-level switching between t he amorphous and meta-stable states. With the assistance of machine learnin g methodology\, in particular\, a closed-loop autonomous system and a clust ering method\, we systematically perform combinatorial exploration on a bro ad composition range of M-Sb-Te ternary systems\, where M is Ge or a transi tion metal. \;The composition spreads are fabricated by the co-sputteri ng method\, and their composition ranges are measured by wavelength dispers ive spectroscopy across the Si spread wafers. To identify optimized composi tions out of these spreads\, X-ray diffraction measurements (synchrotron ra diation)\, Raman spectroscopy\, resistance\, and optical mapping are carrie d out in order to determine the evolution of structure and other properties . Among these spreads\, few new phase-change memory materials are discovere d. Compared with widely used GST225\, these materials show higher phase-cha nge temperature and lower melting point. After fabricating the nano-size de vices\, both photonic and electrical devices fabricated using these nanocom posite phase-change memory materials show clear multi-level symmetric switc hing with low resistance drift and low quenching energy. These results sugg est that these compositions \;can be promising for neuromorphic devices .

    Advisor: Takeuchi

    Location: \; 1201 Toll Physics
    Als o on ZOOM: \; \;https:/ /umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080622Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Heshan Yu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T173000Z DTEND:20220210T190000Z DTSTAMP:20260828T094430Z UID:0lvc3jchjpqresrvv2pi08svhp@google.com CREATED:20220204T184249Z DESCRIPTION:Speaker: Andy Sheng\, UMD \;

    Title: Sigma Models on Quantum Computers

    Abstract: Bosonic quantum field theorie s\, even when regularized by a lattice\, possess an infinite dimensional Hi lbert space. Thus\, some further truncation of the field space of the theor y must be made in order to simulate the theory on a quantum computer with a finite number of qubits\, and physical results can only be obtained after a double limit: one to remove the truncation and another to take the contin uum limit. A simpler way is to find a model with a finite dimensional Hilbe rt space belonging to the same universality class as the continuum model so only the space continuum limit is required. We study two ways of truncatin g the 1+1D O(3) nonlinear sigma model\, using ideas from commutative and no ncommutative geometry\, and explore their universalities using calculations with matrix product states.

    Seminar will also be streamed via zoom:  \;https://umd.zoom.us/j/94067038750     LAST-MODIFIED:20220204T184249Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220818T180000Z DTEND:20220818T190000Z DTSTAMP:20260828T094430Z UID:0d695mpcqu1ess79jjmcou6nf7@google.com CREATED:20220811T112314Z DESCRIPTION:Title:  Tight bounds for Quantum Learning and Testing without Q uantum Memory
    Speaker:  Jerry Li (Microsoft Research)
    Time:  Thursday \, August 18\, 2022 - 2:00pm
    Location:  Virtual Via Zoom: https://uw aterloo.zoom.us/j/94331500184?pwd=NjUxOE81OVJSSWdoeEltai9MRkNVUT09
    < br>In this talk\, we consider two fundamental tasks in quantum state estima tion\, namely\, quantum tomography and quantum state certification. In the former\, we are given n copies of an unknown mixed state rho\, and the goal is to learn it to good accuracy in trace norm. In the latter\, the goal is to distinguish if rho is equal to some specified state\, or far from it. W hen we are allowed to perform arbitrary (possibly entangled) measurements o n our copies\, then the exact sample complexity of these problems is well-u nderstood. However\, arbitrary measurements are expensive\, especially in t erms of quantum memory\, and impossible to perform on near-term devices. In light of this\, a recent line of work has focused on understanding the com plexity of these problems when the learner is restricted to making incohere nt (aka single-copy) measurements\, which can be performed much more effici ently\, and crucially\, capture the set of measurements that can be be perf ormed without quantum memory. However\, characterizing the copy complexity of such algorithms has proven to be a challenging task\, and closing this g ap has been posed as an open question in various previous papers.

    In this talk\, we give tight bounds on the sample complexity of these problem s. More specifically\, we show improved lower bounds for both problems whic h (essentially) match the existing upper bounds in the literature. Our tech niques for both problems are based on new reductions to matrix martingale c oncentration which we believe may be of independent interest.
      LAST-MODIFIED:20220811T112314Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/94331500184?pwd=NjUx OE81OVJSSWdoeEltai9MRkNVUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Jerry Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210204T140000 DTEND;TZID=America/New_York:20210204T153000 DTSTAMP:20260828T094430Z UID:7k842che3i7p9nbqm163c6memm@google.com RECURRENCE-ID;TZID=America/New_York:20210204T140000 CREATED:20210124T203341Z DESCRIPTION:Speaker: You Zhou\, UMD

    Title: \;Wigner \;cry stals \;in atomically thin heterostructures

    Abstract:
    A&n bsp\;Wigner \;crystal \;is one of the earliest predicted collective electronic states and exhibits intriguing quantum and classical phase tran sitions. However\, realizing quantum \;Wigner \;crystals \;< /u>requires placing semiconductors in a strong magnetic field\, limiting th e detailed interrogation of these correlated states and their phase transit ions. In this talk\, I will present a new platform to realize \;Wigner& nbsp\;crystals \;without a magnetic field\, based on atomically thin heterostructures made of transition metal dichalcogenides. In particul ar\, we create semiconducting MoSe2 \;bilayers separated by a thin insulating layer and electrically control the individual layer’s car rier density. We observe optical signatures of a series of bilayer \;Wi gner \;crystals \;formed at symmetric (1:1) and asymmetric (4:1 and 7:1) electron doping of the two MoSe2 \;layers. \;These bilayer \;Wigner \;crystals\, created from the commensurate stacking of triangular electron lattices\, are remarkably stable and allow us to probe both their quantum and classical melting transitions. These re sults open up new avenues for creating and studying exotic many-body quantu m phases in 2D systems.


    Host: Paglione

    Link: \;https://umd.zoom.us/j/91251230757?pwd=MkhFREJrUXNTekV ZTTRGQ244M1VBZz09

    Meeting ID: \;912 5123 0 757


    Password: \; \; 558484 LAST-MODIFIED:20210203T221132Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: You Zhou\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220331T123000 DTEND;TZID=America/New_York:20220331T140000 DTSTAMP:20260828T094430Z UID:7kricndssf147v6c22iib09spd@google.com RECURRENCE-ID;TZID=America/New_York:20220331T123000 CREATED:20220308T204637Z DESCRIPTION:Speaker: Nikhil Karthik\, JLab

    Title: Adding new theoretical dimensions to parton physics of the pion

    Abstract:The recently proposed perturbative matching approach has greatly advanced the lattice computations of the x-dependent hadron structure calculations.  \;One goal of this direction is make lattice QCD a tool to determine PDFs\, GPDs and TMDs of real-world hadrons\, in a manner complementary to e xperimental determinations.  \; In this regard\, I will discuss some la ttice QCD computations of the quark PDF and the DA of the real-world pion. Another direction I am excited about\, is to use lattice QCD just a nonpert urbative UV regulator of generic QCD-like strongly-interacting systems — th e perturbative matching approach now enables us to use partonic observables to understand such QFTs\, and consequently\, the qualitative features of h adron structures in real-world QCD. I will present some results on parton p hysics of pion in many-flavor theories and in the large-Nc limit of QCD.

    Seminar will also be streamed live \;    via zoom: \;< a href="https://umd.zoom.us/j/94067038750">https://umd.zoom.us/j/9406703 8750 LAST-MODIFIED:20220325T170428Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210409T170000Z DTEND:20210409T180000Z DTSTAMP:20260828T094430Z UID:74ug6gu5m73jhlq8q137nvmsvl@google.com CREATED:20210202T141232Z DESCRIPTION:Speaker: Aeriel Murpy-Leonard\, \;Assistant Professor\, Mat erials Science &\; EngineeringThe Ohio State University

    Title:&nb sp\;Investigation of Porosity\, Texture \;and Defonnation Behavior Usin g High Energy X-rays During In-Situ Tensile Loading In Additively Manufactu red 3 l 6L Stainless Steel \;

    Abstract: The evolution of damage\ , texture\, and strain in additive manufactured (AM) 316L stainless steel p roduced via laser powder bed fusion was investigated during in-situ tensile loading using high energy X-rays. Synclu·otron X-ray computed tomography ( XCT) measurements were perfonned to determine the initial porosity and moni tor the evolution of porosity during tensile loading as well as detect the initiation and growth of voids from pre-existing pore defects in the specim ens. The as-built tensile specimens had a cross-sectional area of 1 mm2\, w hich was chosen in order to understand damage behavior in thin-walled strnc tures. Far-field X-ray diffraction measurements were perfonned to quantify c1ystallographic texture and the distribution of internal elastic strains d uring loading. The initial texture from the AM build process had a weak {22 0} texture aligned parallel to the build direction. As a result of tensile defonnation\, a str·ong {lll} + {200} double fiber texture develops at high tensile str·ains and remains until fracture. XCT results confirmed that th e inhomogeneous distr·ibution of porosity near the surface played a signifi cant role in damage evolution during tensile loading where voids and cracks initiated at pre-existing pores located within the contour zone. These por es were found to have asymmetric or irregular morphology. At high tensile s tr·ains\, the massive accumulation of internal damage at these pores eventu ally c01mected to the surface reducing the ductility in these thin-walled A M samples and resulting in fnal failure. \;

    via Zoom
    Sherri T atum
    statum12@umd.edu
    https://mse.umd.edu/seminar-se ries \; \; LAST-MODIFIED:20210329T172205Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T150000Z DTEND:20220331T160000Z DTSTAMP:20260828T094430Z UID:52fnapc8880ll7gs0f0gpu1f28@google.com CREATED:20220324T171056Z DESCRIPTION:Title: Quantum Device Benchmarking from Many- Body Quantum Chaos

    Speaker: \;Joonhee Choi\, CalTec h

    Recently\, there has been remarkable progress tow ards the development of large-scale quantum devices through advances in&nbs p\;quantum science and technology. This progress opens new doors for proof- of-principle demonstrations of quantum simulations as well as \;practic ally useful applications\, such as quantum-enhanced metrology and quantum n etworking. However\, these applications require first \;quantifying how well a quantum device produces a desired target state\, which is currently experimental challenging as existing methods \;for the quantitative ve rification of a quantum device require fine-tuned control and substantial e xperimental resources. In this talk\, I will \;present a simple and eff icient benchmarking protocol to estimate the fidelity of large-scale quantu m devices. Our protocol relies only on \;time evolution of a quantum sy stem undergoing Hamiltonian dynamics\, followed by simple measurements with out any sophisticated \;control and readout. Fundamentally\, this simpl ification stems from a universal phenomenon associated with many-body chaos from \;generic\, strongly interacting quantum systems. We demonstrate our benchmarking protocol experimentally for an analog quantum \;simula tor based on a Rydberg atom array\, and numerically for other quantum platf orms such as superconducting qubits\, trapped ions\, and \;itinerant pa rticles in optical lattices. \; \; < /u>

     LAST-MODIFIED:20220324T171229Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T180000Z DTEND:20220331T190000Z DTSTAMP:20260828T094430Z UID:67to6ot7a5st5f3inmj92q1nbk@google.com CREATED:20220325T214047Z DESCRIPTION:Title: Post-quantum security of the Even-Mansour cipher
    Speaker: Chen Bai (QuICS)
    Time: Thursday\, March 31\, 2022 - 2:00pm
    Location: Virtual Via Zoom: https://umd.zoom.us/j/97066068585

    The Even-Mansour cipher is a s imple method for constructing a (keyed) pseudorandom permutation E from a p ublic random permutation P: {0\,1}^n ->\;{0\,1}^n. It is a core ingredien t in a wide array of symmetric-key constructions\, including several lightw eight cryptosystems presently under consideration for standardization by NI ST. It is secure against classical attacks\, with optimal attacks requiring q_E queries to E and q_P queries to P such that q_P × q_E ≈ 2^n. If the at tacker is given quantum access to both E and P\, however\, the cipher is co mpletely insecure\, with attacks using q_P = q_E = O(n) queries known. In a ny plausible real-world setting\, however\, a quantum attacker would have o nly classical access to the keyed permutation E implemented by honest parti es\, while retaining quantum access to P. Attacks in this setting with q_P^ 2 × q_E ≈ 2^n are known\, showing that security degrades as compared to th e purely classical case\, but leaving open the question as to whether the E ven-Mansour cipher can still be proven secure in this natural ``post-quantu m'\;'\; setting. We resolve this open question\, showing that any att ack in this post-quantum setting requires q^2_P × q_E + q_P × q_E^2 ≈ 2^n . Our results apply to both the two-key and single-key variants of Even-Man sour. Along the way\, we establish several generalizations of results from prior work on quantum-query lower bounds that may be of independent interes t.

    (In person viewing at 3100A Atlantic Building)
    < u>     LAST-MODIFIED:20220325T214047Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/97066068585 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Chen Bai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210211T210000Z DTEND:20210211T220000Z DTSTAMP:20260828T094430Z UID:6in3oq2ltt6qbh3b2qsfohoila@google.com CREATED:20210119T141549Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Diego Redig olo\, CERN

    Title: Ripples in Spacetime from broken SUSY

    Abst ract:
    If we live in a supersymmetric world\, SUSY has to be broken at so me (high) scale. I will show how the presence of a SUSY-breaking hidden sec tor can lead to gravitational wave (GW) signals at future interferometers. I will focus on first order phase transitions that can occur along the pseu domodulus universally related to SUSY breaking. Current bounds on the super partners are compatible with GW signals at future interferometers\, while t he observation of a GW signal from a SUSY-breaking hidden sector would impl y superpartners within the reach of future colliders. Along the way\, I wi ll analyze the new field theoretical features of the phase transition along the pseudomodulus direction. These allow us to pinpoint what are the neces sary requirements for a SUSY-breaking hidden sector to lead to strong GW si gnals.

    Seminar Slides LAST-MODIFIED:20210302T145156Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Special Joint UMD/ Cornell Seminar** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210330T160000 DTEND;TZID=America/New_York:20210330T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210330T160000 CREATED:20200116T204737Z DESCRIPTION:ZOOM RECORDING
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=f6bcbb54-df95-4893-b034-acfb01671671

    Join Zoom Meeting
    https://umd.zoom.us/j/92195226516?pwd=a3NjYTNpUWI5Y1NYdXF vT2ZlK1ZiZz09


    Meeting ID: 921 9522 6516
    Passcode: 065736< br>
    Speaker: Edmund Bertschinger\, MIT

    Title: How Departments Cha nge: A Cautionary Example

    Abstract: Among the major research univers ities in the 1970s and 1980s\, MIT had an unusually large (though still sma ll) percentage of women and African Americans as both faculty and students in its physics department. This talk discusses how this happened\, why it e nded\, and how this information guided later change efforts. The answers go far beyond one physics department to include biologists\, university presi dents\, and two US presidents.

    Host: Sarah Eno LAST-MODIFIED:20220120T142431Z LOCATION:zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210323T171500Z DTEND:20210323T181500Z DTSTAMP:20260828T094430Z UID:5efkuk2eufjjgsnbb3cqqnmn73@google.com CREATED:20210202T180117Z DESCRIPTION:Speaker: Mr. Wade Hodson\, UMD

    Title: Energy Diffusion a nd Absorption in Chaotic Systems with Rapid Periodic Driving

    Abstrac t: When a chaotic\, ergodic Hamiltonian system is subject to sufficiently r apid periodic driving\, its energy evolves diffusively. We derive a Fokker- Planck equation that governs the evolution of the system's probability dist ribution in energy space\, and we provide explicit expressions for the ener gy drift and diffusion rates. In this talk\, I will summarize the derivatio n of these findings\, and discuss the implications for energy absorption in such systems. I will also present some theoretical and numerical results f or driven billiard systems\, which corroborate the energy diffusion descrip tion. Finally\, I will describe how our work is relevant to understanding p eriodically driven quantum systems in the semiclassical limit.

    Where : \;https://go.umd.edu/statphys_spring2021 LAST-MODIFIED:20210317T134955Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220426T150000Z DTEND:20220426T160000Z DTSTAMP:20260828T094430Z UID:7fvlfi2er570r3on9vpaefa4lj@google.com CREATED:20220207T180905Z DESCRIPTION:Speaker: Dr. Linda Columbus\, University of Virginia

    Title: Vignettes from Biophysical Investigation of Membranes\, Memb rane Mimics\, and Membrane Proteins: How They Assemble\, Interact\, and Mov e

    Abstract: \;https://chem.umd.edu/events/speaker-linda-columbus LAST-MODIFIED:20220426T142325Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T163000Z DTEND:20211118T173000Z DTSTAMP:20260828T094430Z UID:757fk7urp96c5h7csuenrj8es6@google.com CREATED:20210825T151245Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Anna Watts\, University of Amsterdam

    Title: A NICER view of neutron stars


    Abstract: NICER\, the Neutron Star Interior Composition Explorer\, is an X-ray telescope that was installed on the International Space Station i n 2017. Its mission is to study the nature of the densest matter in the Uni verse\, found in the cores of neutron stars. NICER uses Pulse Profile Mode ling\, a technique that exploits relativistic effects on X-rays emitted fro m the hot magnetic polar caps of millisecond pulsars. The technique also lets us map the hot emitting regions\, which form as magnetospheric particl es slam into the stellar surface. I will present NICER's latest results - including a measurement of the radius of the highest mass pulsar known - an d discuss the implications for our understanding of ultradense matter\, pul sar emission\, and stellar magnetic fields. I will also look ahead to the next generation of X-ray telescopes that will exploit the Pulse Profile Mod elling technique. LAST-MODIFIED:20211112T142129Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T171500Z DTEND:20220412T181500Z DTSTAMP:20260828T094430Z UID:0e6gpbghbv795cercgl5snpgb5@google.com CREATED:20220207T155302Z LAST-MODIFIED:20220207T155302Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210504T170000Z DTEND:20210504T180000Z DTSTAMP:20260828T094430Z UID:1l6ciabr5cr07lhkfj5l16e2kd@google.com CREATED:20210430T112259Z DESCRIPTION:Speaker: Xie Chen (CalTech)

    Title: Fracton and Chern-Sim ons Theory

    Abstract: Fracton order describes the peculiar phenomena that point excitations in certain strongly interacting systems either canno t move at all or are only allowed to move in a lower dimensional sub-manifo ld. It has recently been discovered in various lattice models\, tensor gaug e theories\, etc. In this talk\, we discuss how another powerful field theo ry framework -- the 2+1D Chern-Simons (CS) gauge theory -- can be used to p rovide new insights and explore new possibilities in 3+1D fracton order. 2+ 1D U(1) gauge theories with a CS term provide a simple and complete charact erization of 2+1D Abelian topological orders. To study 3+1D fracton order\, we extend the theory by taking the number of component gauge fields to be infinity. In the simplest case of infinite-component CS gauge theory\, diff erent components do not couple to each other and the theory describes a dec oupled stack of 2+1D fractional Quantum Hall systems with quasi-particles m oving only in 2D planes -- hence a fractonic system. More interestingly\, w e find that when the component gauge fields do couple through the CS term\, more varieties of fractonic orders are possible. For example\, they may de scribe foliated fractonic systems which extends the framework found in exac tly solvable models. At the same time\, we find examples which lie beyond t he foliation framework\, characterized by 2D excitations of infinite order and braiding statistics that are not strictly local.

    For Zoom det ails email: rcawthor@umd.edu LAST-MODIFIED:20210430T112259Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210129T180000Z DTEND:20210129T190000Z DTSTAMP:20260828T094430Z UID:53k9kl8v9idceractlnnk1r36h@google.com CREATED:20210120T153607Z DESCRIPTION:Speaker: Sebastian Engelmann (MSE Ph.D. '08) Manager\, Advanced Plasma Processing Group Thomas J. Watson Research Center\, IBM

    Titl e: \;Etch Process Technology for Emerging Computing Applications

    Abstract: Advances in the semiconductor industry\, historically based on M oore’s Law and Dennard scaling\, have become progressively challenging as d evice technology moves beyond the 7nm node. Instead of continuing to optimi ze compute performance in the classic sense\, more and more emphasis is bei ng put on optimizing and/or redeveloping computational approaches and devic e architectures to produce more efficient and higher performance systems. H ardware for novel AI systems is no exception\,. New integration schemes\, n ovel materials\, multi-component materials or even nanoscale materials and the ability to integrate all of these approaches together becomes the compo unded challenge. Etch technologies that offer differentiating solutions to these issues therefore need to meet somewhat conflicting demands\, such as low damage processing as well as high rate processing beside many other iss ues.

    Novel thin films\, thin film laminates and alloys promising unpreced ented performance are growing the need for the ultimate etch solution: etch ing with atomic layer precision. Atomic layer etching is a promising path t o answer the processing demands of new devices at the Angstrom scale. Self- limiting reactions\, discrete reaction and activation steps or extremely lo w ion energy plasmas are some of the pathways being pursued for precise mat erial removal control and maintaining the original film performance. The ab ility to achieve atomic layer precision is reviewed in detail for a variety of material sets and implementation methods.

    Multi-component integra tion is raising the importance of heterogeneous integration challenges. An early adapter of such integration strategies is Silicon Photonics\, which l everages the microelectronic wafer fabrication infrastructure to create pho tonic circuits with unprecedented complexity and cost-efficiency. Novel pac kaging approaches for Silicon Photonics will be discussed in detail. A furt her outlook on heterogeneous integration approaches and how etch process de velopment may be a critical enabler in cost reduction will be reviewed.

    via Zoom: Please contact Sherri Tatum \;statum12@umd.edu \; \;

    LAST-MODIFIED:20210120T153923Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221012T150000Z DTEND:20221012T160000Z DTSTAMP:20260828T094430Z UID:3vlo7c34bl8i1dgi4mo4ri5ku2@google.com CREATED:20220901T140006Z DESCRIPTION:Title: Learning global charges from local measureme nts
    Speaker: Romain Vasseur (UMass Amherst)
    Time: Wednesday\, Octob er 12\, 2022 - 11:00am
    Location: ATL 3100A and Virtual Via Zoom: \; https://umd.zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09< /a>

    Monitored random quantum circuits (MRCs) exhibit a measurement-i nduced phase transition between area-law and volume-law entanglement scalin g. In this talk\, I will argue that MRCs with a conserved charge additional ly exhibit two distinct volume-law entangled phases that cannot be characte rized by equilibrium notions of symmetry-breaking or topological order\, bu t rather by the non-equilibrium dynamics and steady-state distribution of c harge fluctuations. These include a charge-fuzzy phase in which charge info rmation is rapidly scrambled leading to slowly decaying spatial fluctuation s of charge in the steady state\, and a charge-sharp phase in which measure ments collapse quantum fluctuations of charge without destroying the volume -law entanglement of neutral degrees of freedom. I will present some statis tical mechanics and effective field theory approaches to such charge-sharpe ning transitions\, and relate them to the efficiency of classical decoders to “learn” the global charge of quantum systems from local measurements. LAST-MODIFIED:20220901T175537Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Romain Vasseur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210614T140000Z DTEND:20210614T220000Z DTSTAMP:20260828T094430Z UID:6gssa3ehrq4rvdv5uln3uldcvb@google.com CREATED:20210519T162131Z DESCRIPTION:"Twisted: Physics of 2D Twisted Moire Systems" - Virtual Con ference

    Thrid conference in the Janet Das Sarma Conference Serie s
    Email     Rcawthor@umd.edu for Zo om details

    10 AM: Pablo Jarillo-Herrero\, “Moiré Magic 3.0 ” \; \;

    11 AM: \;Ashvin Vishwanath\, “Moire' magic near charge neutrality: \; From sign-free numerics to fractional vortices” \;

    12 PM: Andrea Young\, “Easy as ABC”&nb sp\;

    1 PM: Michael Zaletel\, “DMRG evidence for skyrmion -mediated superconductivity” \;

    2 PM: Oskar Vafek\, “Correlations and topology in the magic angle twisted bilayer graphene”&nbs p\;

    3 PM: Cory Dean\, “TBA” \;

    4 PM: Kin Fai Mak\, “Semiconductor moiré 2.0” \;

    5 PM: Sankar D as Sarma\, “Superconductivity\, magnetism\, strange metals\, and correlated insulators in twisted 2D moire systems” LAST-MODIFIED:20210611T184225Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Conference: "Twisted: Physics of 2D Twisted Moire Systems" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211026T160000 DTEND;TZID=America/New_York:20211026T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211026T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker\, Charles Kane\, University of Pennsylvania

    T he Emergence of Topological Quantum Matter
     \;

    Abstract: Matter can arrange itself in the most ingenious ways. In addition to the solid\, liquid and gas phases that are familiar in class ical physics\, electronic phases of matter with both useful and exotic prop erties are made possible by quantum mechanics. In the last century\, the th orough understanding of the simplest quantum electronic phase - the electri cal insulator - enabled the development of the semiconductor technology tha t is ubiquitous in today's information age. In the present century\, new "t opological" electronic phases are being discovered that allow the seemingly impossible to occur: indivisible objects\, like an electron or a quantum b it of information\, can be split into two\, allowing mysterious features of quantum mechanics to be harnessed for future technologies. Our understandi ng of topological phases builds on deep ideas in mathematics. We will try t o convey that they are as beautiful as they are fundamental.

    https://umdphysics.umd.edu/about-us/news/department-news/1745-kane-p range.html LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220916T160000Z DTEND:20220916T170000Z DTSTAMP:20260828T094430Z UID:0ftupspmst2rtsr1g1bljjlb5t@google.com CREATED:20220908T221803Z DESCRIPTION:Title: Measurement and entanglement in atom arrays\nSpeaker: Nathan Schine (University of Maryland)\nTime: Friday\, September 16\, 2022 - 12:00pm\nLocation: ATL 2324\n\nArrays of neutral atoms promise to enabl e a variety of goals across quantum science\, including quantum information processing\, metrology\, and many-body physics. While there have been rece nt significant improvements in quantum control\, coherence times\, and enta nglement generation\, one outstanding limitation is the efficient implement ation of dissipation or measurement. An exciting possibility to overcome th is challenge involves the integration of the atom array with an optical cav ity\, whereby strong coupling between atoms and light enables fast mid-circ uit measurement. Beyond quantum information processing applications (e.g. e rror correcting codes)\, engineering dissipation in interacting quantum sys tems opens the door to autonomous stabilization of many-body states as well as studies of entanglement transitions.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220908T221803Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Nathan Schine TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T190000Z DTEND:20220210T203000Z DTSTAMP:20260828T094430Z UID:45i627lrene7c89b3pvrdg6mur@google.com CREATED:20220204T144842Z DESCRIPTION:Title: Probing Quantum Materials With The Lens Of Ma chine Learning \;

    Abstract: Despite the significant progress in experimental techniques\, understanding the microscopic interaction mechani sms in a quantum material remains a grand challenge. With monotonically inc reased experimental data\, machine learning(ML) brings new hope and can ser ve as a new probe to study the complex interplay between the charge\, orbit al\, spin\, and lattice degrees of freedom. In this colloquium\, I will int roduce how ML can be used to reveal the hidden information in experimental data and elucidate the quantum materials. I will provide a few examples fro m our research\, that 1) how ML can help identify the proximity effect\, an effect that can lead to dissipationless spintronics or topological quantum computing\, 2) how ML can be used to analyze spectra to reach topological materials classification\, and 3) how ML can result in interfacial defects identification with unprecedented knowledge\, and magnetic structure identi fication through architecture design. We highlight the importance of the re presentations and envision a variety of problems that can benefit from mach ine learning.

    [1] \;https://onlinelibrary.wiley.com/doi/10.1002/advs.202004 214 \;

    [2] \;https://aip.scitation.org/doi/10.1063/5.0049111

    [3]  \;https://arxiv.org/abs/200 3.00994

    [4] \;http s://arxiv.org/abs/2109.08005


    Host: Jeff Lynn
     \;

    V IRTUAL Seminar on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220204T155333Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Mingda Li\, MIT (ZOOM) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210413T171500Z DTEND:20210413T181500Z DTSTAMP:20260828T094430Z UID:10a3aq8p97qt5rd1fo97uk5rlg@google.com CREATED:20210202T180310Z DESCRIPTION:Speaker: Dr. Alexia Auffèves\, CNRS - Grenoble\, France\n\nTitl e: A Short Story of Quantum an Information Thermodynamics\n\nAbstract: This talk is a fast journey through the build-up of key thermodynamical concept s\, i.e. work\, heat and irreversibility -- and how they relate to informat ion. Born at the time of industrial revolution to optimize the exploitation of thermal resources\, these concepts have been adapted to small systems w here thermal fluctuations are predominant. Extending the framework to quant um fluctuations is a great challenge of quantum thermodynamics\, that opens exciting research lines e.g. measurement fueled engines or thermodynamics of driven-dissipative systems. On a more applied side\, it provides the too ls to optimize the energetic consumption of future quantum computers. LAST-MODIFIED:20210409T202011Z LOCATION:https://go.umd.edu/statphys_spring2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210921T160000 DTEND;TZID=America/New_York:20210921T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210921T160000 CREATED:20200116T204737Z DESCRIPTION:No colloquium on September 21. LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210927T190000Z DTEND:20210927T203000Z DTSTAMP:20260828T094430Z UID:1o598eonov07odar55i1199qer@google.com CREATED:20210824T121233Z DESCRIPTION:Speaker: Anirudh Prabhu\, Stanford\n\nTitle: Axion Production i n Pulsar Magnetosphere Gaps\n\nAbstract: Pulsar magnetospheres admit non-st ationary vacuum gaps that are characterized by non-vanishing E•B. The vacuu m gaps play an important role in plasma production and electromagnetic wave emission. We show that these gaps generate axions whose energy is set by t he gap oscillation frequency. The density of axions produced in a gap can b e several orders of magnitude greater than the ambient dark matter density. In the strong pulsar magnetic field\, a fraction of these axions may conve rt to photons\, giving rise to broadband radio signals. We show that dedica ted observations of nearby pulsars with radio telescopes (FAST) and interfe rometers (SKA) can probe axion-photon couplings that are a few orders of ma gnitude lower than current astrophysical bounds. LAST-MODIFIED:20210922T133514Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T180000Z DTEND:20220215T190000Z DTSTAMP:20260828T094430Z UID:2in6m5gp7ee1a2nv6tggvv1e4o@google.com CREATED:20220207T141228Z LAST-MODIFIED:20220207T141228Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210810T140000Z DTEND:20210810T150000Z DTSTAMP:20260828T094430Z UID:7s3gb25nvk3uikt3h3qqc3khlk@google.com CREATED:20210708T130046Z DESCRIPTION:Title: Linear growth of quantum circuit complexity\nSpeaker: J onas Haferkamp (Freie Universität Berlin)\nTime: Tuesday\, August 10\, 2021 - 10:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91765577450?p wd=T1h1OXBmSVRvVVAreGZsK3pHRHpqUT09\n\nQuantifying quantum states’ complexi ty is a key problem in various subfields of science\, from quantum computin g to black-hole physics. We prove a prominent conjecture by Brown and Sussk ind about how random quantum circuits’ complexity increases. Consider const ructing a unitary from Haar-random two-qubit quantum gates. Implementing th e unitary exactly requires a circuit of some minimal number of gates - the unitary’s exact circuit complexity. We prove that this complexity grows lin early in the number of random gates\, with unit probability\, until saturat ing after exponentially many random gates. Our proof is surprisingly short\ , given the established difficulty of lower-bounding the exact circuit comp lexity. Our strategy combines differential topology and elementary algebrai c geometry with an inductive construction of Clifford circuits. Reference: Haferkamp\, Jonas\, et al. "Linear growth of quantum circuit complexity." arXiv preprint arXiv:2106.05305 (2021). \n\nThis talk is part of the IQC-Qu ICS Math and Computer Science Seminar. LAST-MODIFIED:20210708T130046Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210209T160000Z DTEND:20210209T170000Z DTSTAMP:20260828T094430Z UID:4uo2hkifm0a1698uteeft46uhc@google.com CREATED:20210125T150956Z DESCRIPTION:
    Speaker: Kun Yang \;(Florida State University)
    Title: \;Interplay of Topology and Geometry in Fractional Quantum Hall Liquids
    Abstract: \;Fractional Quantum Hal l Liquids (FQHL) are the ultimate strongly correlated electron systems\, an d the birth place of topological phase of matter. Early theoretical work ha s emphasized the universal or topological aspects of quantum Hall physics. More recently it has become increasingly clear that there is very interesti ng bulk dynamics in FQHL\, associated with an internal geometrical degree o f freedom\, or metric. The appropriate quantum theory of this internal dyna mics is thus expected to take the form of a “quantum gravity”\, whose eleme ntary excitations are spin-2 gravitons. After briefly reviewing the topolog ical aspect of FQHL\, I will discuss in this talk how to probe the presence of this internal geometrical degree of freedom experimentally in the stati c limit\, and detect the graviton excitation in spectroscopic measurements\ , in particular how to reveal its chirality. Comparison will be made with r ecent experimental and numerical work\, and discussions on future experimen tal probe of the graviton chirality as well as its significance will be pre sented.
    Host Yang-Zhi Chou
    Email rcawthor@umd.edu for Zoom details
    LAST-MODIFIED:20210129T214011Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210208T210000Z DTEND:20210208T223000Z DTSTAMP:20260828T094430Z UID:0ne0v0pnnsr74i9subqbrb1o3r@google.com CREATED:20210129T135202Z DESCRIPTION:Speaker: Atsutoshi Ikeda\, UMD\nTitle: Discovery of supercond uctivity in CaSb2\nAbstract: \nTopological materials have been one of the h ottest topics of the recent \ncondensed matter physics.\nStarting from the topological insulator with a nontrivial topology \nprotected by the time-re versal symmetry\,\nsome other topological phases have been proposed based o n the \ncrystalline symmetry\, such as the topological crystalline insulato r and \nthe Dirac semimetal.\nLast year\, we reported discovery of supercon ductivity in CaSb2 with a \ntransition temperature of 1.7 K [1].\nThis mate rial crystallizes in a nonsymmorphic structure and\nhas topologically prote cted Dirac lines in its bulk electronic band \nstructure even in the presen ce of spin-orbit coupling.\nIn this presentation\, we will talk about the t heoretical background \nabout the crystalline symmetry and band structure\n and then show experimental data evidencing bulk superconductivity.\n[1] A. Ikeda et al.\, Phys. Rev. Mater. 4\, 041801(R) (2020).\nAdvisor: Paglione\n \n\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRC TU5UcHlWTThtcEZSdz09\n\nMeeting ID: 969 7573 5470\nPasscode: 005596 LAST-MODIFIED:20210201T141943Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Atsutoshi Ikeda\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210421T150000Z DTEND:20210421T160000Z DTSTAMP:20260828T094430Z UID:7rph4ku9qe497hsmmv2t2kn4q1@google.com CREATED:20210412T132616Z DESCRIPTION:Speaker: Brenda Rubenstein\, Joukowsky Family Assistant Profess or of Chemistry\, Brown University

    Title: Computing with Molecules: Storage and Computation Using Small Molecules and Their Reaction Networks
    Abstract: As transistors near the size of molecules\, computer engine ers are increasingly findingthemselves asking a once idle question: how can we compute using chemistry? In this talk\, I
    will discuss recent progre ss my Brown Molecular Informatics team and I have made
    demonstrating how mixtures of small\, unordered molecules can process information. During th e
    first portion of this talk\, I will illustrate how combinatorial chemi cal synthesis combined with high
    resolution mass spectrometry can be har nessed to store GBs of information in small molecules
    and metabolites. I will then turn to describing how basic principles of chemistry can be expl oited
    to realize fully molecular neural networks for machine learning an d image processing. I will end
    with a discussion of the challenges molec ular computation faces that may be resolved with
    clever doses of synthet ic and theoretical chemistry\, and the connections molecular computation
    has to the field of systems chemistry.

    Where: \;go.umd.edu/pche m_spring2021 LAST-MODIFIED:20210413T215115Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T163000Z DTEND:20220428T180000Z DTSTAMP:20260828T094430Z UID:0j9tko0blkaedm08gpvjgveao2@google.com CREATED:20220406T192556Z DESCRIPTION:Speaker: Ingo Tews\, LANL

    Title: From N uclei to Neutron Stars with Chiral Effective Field Theory and Multimessenge r Astrophysics

    Abstract:
    Neutron stars contain the largest reservoirs of degenerate fermions\, reaching the highest densities
    we can observe in the cosmos\, and probe matter under conditions that cannot b e recreated in
    terrestrial experiments. Throughout the Universe\, a la rge number of high-energy\, cataclysmic
    astrophysical collisions of ne utron stars are continuously occurring and provide an excellent
    testbe d to probe the properties of matter at densities exceeding the density insi de atomic nuclei.
    In addition\, these phenomena allow us to test theor ies of strong interactions.
    In this talk\, I will show how to combine nuclear theory calculations using chiral effective field
    theory and qu antum Monte Carlo methods with data from astrophysical multi-messenger
    observations of neutron stars and from heavy-ion collisions of gold nuclei at relativistic energies
    to improve our understanding of dense matter . I will show that constraints from heavy-ion
    collision experiments sh ow a remarkable consistency with multi-messenger observations and
    prov ide complementary information on nuclear matter at intermediate densities. This work
    combines nuclear theory\, nuclear experiment\, and astrophys ical observations\, and shows how
    joint analyses can shed light on the properties of neutron-rich supranuclear matter over the
    density range probed in neutron stars.     LAST-MODIFIED:20220427T201439Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220512T140000Z DTEND:20220512T150000Z DTSTAMP:20260828T094430Z UID:5375ggk47faqsotgot4dh6h988@google.com CREATED:20220505T161826Z DESCRIPTION:Title: Software architectures for real-time quantum control sy stems\nSpeaker: Leon Riesebos (Duke University)\nTime: Thursday\, May 12\ , 2022 - 10:00am\nLocation: PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536\n\nReal-time control software and hardware is essential for operating modern quantum systems. I n particular\, the software plays a crucial role in bridging the gap betwee n applications and real-time operations on the quantum system. Unfortunatel y\, real-time control software is an often underexposed area\, and many wel l-known software engineering techniques have not propagated to this field. As a result\, control software is often hardware-specific at the cost of fl exibility and portability. In this presentation we will present techniques and tools that enable the development of reliable\, flexible\, and portable control software for real-time control systems. We present a modular softw are architecture for real-time control software and show that modular contr ol software can reduce kernel execution time overhead by 63.3% on average. Our code portability analysis shows that two distinctly different systems c an share between 49.8% and 91.0% of code statements. Additionally\, we will cover testing and simulation tools for real-time control software. We show that our kernel simulator is 6.9 times faster on average compared to execu tion on hardware while the position of the timeline cursor is simulated wit h an average accuracy of 97.9%. LAST-MODIFIED:20220505T162708Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Leon Riesebos TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211115T210000Z DTEND:20211115T223000Z DTSTAMP:20260828T094430Z UID:2tidi71qu5kbgeerrcrvtae397@google.com CREATED:20211111T142613Z DESCRIPTION:Speaker 1: Arthur Carlton Jones

    Title: Determining UTe2 \;surface impedance through microwave resonance measur ements \;

    Abstract: The complex surface impedance of a supercondu ctor provides many insights into its properties\, such as the pairing mecha nism\, super- and normal-fluid responses\, and possibly it’s topological pr operties. We explore the surface impedance of a UTe2 \;singl e crystal as a function of temperature using resonant cavity measurements f or a variety of microwave-frequency modes. By determining the resonant freq uency and quality factor over a range of temperatures\, we reconstruct the surface impedance of the sample. We match the behavior of the resistance an d reactance in the normal state to their expected behavior\, determined by the normal state resistivity.  \;Since UTe2 \;is anisotr opic\, we take a linear combination of the losses corresponding to each cry stallographic direction to do this fitting. Through this method\, the aniso tropic nature of UTe2 \;allows us to determine the combinati on of crystallographic directions excited in each resonant mode. We present the results of the anisotropic surface impedance temperature dependence in the superconducting and normal states\, as well as additional quantities w hich can be determined from the surface impedance including complex conduct ivity\, penetration depth\, and quasiparticle scattering time. We relate th e results to topics of current interest in this unique material.


    Adv isor: \; Steven Anlage \;





    Speaker 2: Raymond Mencia

    Title: Blochnium: A \; \;flux-insensit ive qubit with flux-tunable interactions

    Abstract:
    We introduce a flux-like qubit\, nicknamed 'blochnium'\, whose 0-1 transition frequency i s nearly insensitive to the external flux bias \;and is dual to transmo n. Blochnium is created by shunting a small Josephson junction with a \ ;hyperinductance\, that is -- a maximal per-unit-length inductance that has minimal stray capacitance and is probably the highest impedance electromag netic structure available today (Z \; >\; 200 kOhms). To achieve such inductances\, we release the entire circuit from the high dielectric subst rate and suspend it almost entirely in vacuum. The qubit’s spectrum reveals a 0-1 flux dispersion on the order of a hundred MHz which becomes exponent ially suppressed when decreasing the ratio EL/EC providing protection again st 1/f flux noise. However\, the higher transitions remain flux-sensitive a llowing for multi-qubit operations. We report on recent coherence propertie s of blochnium with varying device design and etching techniques.

    Ad visor: Vladimir Manucharyan \;


    Location: Phys Toll Rm#1201Seminar also on ZOOM: \;  \;https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20211112T211540Z LOCATION:John Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Arthur Carlton Jones/Raymond Mencia Mencia TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220223T170000Z DTEND:20220223T180000Z DTSTAMP:20260828T094430Z UID:4pqtqfmtbuug1397innhrkd0ar@google.com CREATED:20220207T164800Z DESCRIPTION:Speaker: Joseph A. King\, Jr.\, Ph.D.\, Program Director\, ARPA -E\, U.S. Department of Energy\n\nTitle: An Unexpected Journey Through Scie nce & Engineering\n\nAbstract: A presentation on how one’s early anticipate d career path deviates in reality due to the choices one makes in the momen t. In this tale\, the meanderings include the design\, scale-up and optimiz ation of commercial plants\, acquisitions in post-iron curtain Europe\, fiv e years on Wall Street\, developing cements in China and India\, more VC ac tivities\, and expanding new technologies while in the federal government. Detailed technology descriptions will span the development of solventless\, non-phosgene routes to polymers\, a ten-year publishing battle over kineti cs\, getting around the mass law (acoustics)\, making a figure of merit mat erial independent (thermoelectric generators)\, more cement\, and approache s to squashing the “Duck Curve” (Grid).\nBio:\n\nJoseph A. King Jr. is curr ently a Program Director in the Department of Energy’s Advance Research Pro jects Agency for Energy (ARPA-E) with current activities in waste heat\, ce ments and concretes\, amorphous metals and grid optimization. Dr. King come s to ARPA-E from DuPont where he was a Managing Director in DuPont’s Corpor ate Venture Capital group responsible for their advanced materials investme nts. Prior to DuPont\, Dr. King held a variety of positions GE ranging from Liaison scientist\, to Vice President of Risk Management and Capital Marke ts. He is a double alum from U.C. Berkeley with a Ph.D. in Physical Organic Chemistry. After graduation\, Dr. King conducted a post-doctoral study at the Max Planck Insitut für Kohlenforschung in Germany. He is the author of over 40 journal articles and more than 100 patents. LAST-MODIFIED:20220217T143913Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T143000Z DTEND:20211118T153000Z DTSTAMP:20260828T094430Z UID:2klrk7hktdhaliat5k69m84f1h@google.com CREATED:20211116T182225Z DESCRIPTION:





    Speaker: Saeed Kha n\, Princeton
    Title: \;Physical reservoir computing using fini tely-sampled quantum systems

    Abstract: \;The paradi gm of reservoir computing exploits the nonlinear dynamics of a physical res ervoir to perform complex time-series processing tasks such as speech recog nition and forecasting. Unlike other machine-learning approaches\, reservoi r computing relaxes the need for optimization of intra-network parameters\, and is thus particularly attractive for near-term hardware-efficient quant um implementations. However\, the complete description of practical quantum reservoir computers requires accounting for their placement in a quantum m easurement chain\, and its conditional evolution under measurement. Consequ ently\, training and inference has to be performed using finite samples fro m obtained measurement records. Here we describe a framework for reservoir computing with nonlinear quantum reservoirs under continuous heterodyne mea surement. Using an efficient truncated-cumulants representation of the comp lete measurement chain enables us to sample stochastic measurement trajecto ries from reservoirs of several coupled nonlinear bosonic modes under stron g excitation. This description also offers a rigorous mathematical basis to directly compare the computational performance of a given physical reservo ir operated across classical and quantum regimes\, considering a variety of practical performance metrics such as fidelity\, sample-efficiency\, and t ime-to-solution. Even for a reservoir as small as a single node where entan glement cannot play a role\, we show that operation deeper in the quantum r egime offers a modest but statistically significant advantage in sample-eff iciency for learning Gaussian quantum states that have the same mean but di stinct variances. Further\, comparing the same metrics we show that certain other state learning tasks are better performed by reservoirs in the class ical regime. Our results also identify the vicinity of classical bifurcatio n points as presenting optimal conditions for nonlinear processing by an os cillator-based quantum reservoir. The considered models are directly realiz able in modern circuit QED experiments\, while the framework is applicable to more general quantum nonlinear reservoirs.

    arXiv:2110.13849
     \;
     \;
    L ocation: PSC 2136

    Host: Kanu Sinha/Alicia Kollár LAST-MODIFIED:20211116T182225Z LOCATION:PSC2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210129T170000Z DTEND:20210129T174500Z DTSTAMP:20260828T094430Z UID:6ktppabp95nj0n8rv5smsoaa4i@google.com CREATED:20210120T145613Z DESCRIPTION:Title : Hofstadter butterfly and Floquet topological insu lators in minimally twisted bilayer graphene
     \;
    Speaker : Yang-Zhi Chou \;

     \;
    Time : 12 - 12:45pm\, Friday\, Jan. 29
     \;
    Seminar will be held via Zoom: https://umd.zo om.us/j/97099328991 and Meeting ID : 970 9932 8991 \;
     \;

    Abstract:
    We theoretically study the Hofs tadter butterfly of a triangular network model in minimally twisted bilayer graphene. The band structure manifests periodicity in energy\, mimicking t hat of Floquet systems. The butterfly diagrams provide fingerprints of the model parameters and reveal the hidden band topology. In a strong magnetic field\, we establish that \;minimally \;twisted bilayer graphene realizes low-energy Floquet topological insulators (FTIs) carrying zero Chern number\, while hosting chiral edge states in bulk gaps . We identify the FTIs by analyzing the nontrivial spectral flow in the Hof stadter butterfly\, and by explicitly computing the chiral edge states. Our theory paves the way for an \;effective \;prac tical realization of FTIs in equilibrium solid-state systems.  \; LAST-MODIFIED:20210120T145613Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211029T160000Z DTEND:20211029T164500Z DTSTAMP:20260828T094430Z UID:28218itf916kicmglh8q4a7c1l@google.com CREATED:20211021T163534Z DESCRIPTION:Title:  Large-N solvable models of measurement-induced critical ity
    Speaker:  Subhayan Sahu (University of Maryland\, Physics)
    Time:  Friday\, October 29\, 2021 - 12:00pm
    Location:  ATL 2324 and Virtual Vi a Zoom: https:/ /umd.zoom.us/j/99484119207

    Competition between unitary dynamics that scrambles quantum information non-locally and local measurements that probe and collapse the quantum state can result in a measurement-induced en tanglement phase transition. Here we introduce analytically tractable model s of measurement-induced criticality in large-N Brownian hybrid circuit mod el composed of qubits [1]. The system is initially entangled with an equal sized reference\, and the subsequent hybrid system dynamics either partiall y preserves or totally destroys this entanglement depending on the measurem ent rate. Our approach can access a variety of entropic observables\, which are represented as a path integral coupling four replicas with twisted bou ndary conditions. Saddle-point analysis reveals a second-order phase transi tion corresponding to replica permutation symmetry breaking below a critica l measurement rate. The transition is mean-field-like and we characterize t he critical properties near the transition in terms of a simple Ising field theory in 0+1 dimensions. We also extend these solvable models to study th e effects of power-law long-range couplings on measurement-induced phases. In one dimension\, the long-range coupling is irrelevant for α>\;3/2\, wi th α being the power-law exponent. For α<\;3/2 the long-range coupling be comes relevant\, leading to a nontrivial dynamical exponent at the measurem ent-induced phase transition. More interestingly\, for α<\;1 the entangle ment pattern receives a sub-volume correction for both area-law and volume- law phases. The volume-law phase with such a sub-volume correction realizes a novel quantum error correcting code whose code distance scales as L^(2−2 α) [2].

    References: [1] Phys. Rev. B 104\, 094304 (2021)\, ArXiv:210 4.07688.\, [2] ArXiv:2109.00013.

    Pizza and drinks served after the t alk. LAST-MODIFIED:20211021T163534Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Subhayan Sahu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220607T150000Z DTEND:20220607T160000Z DTSTAMP:20260828T094430Z UID:3jr403bgej5lkibe601950ubq3@google.com CREATED:20220602T163512Z DESCRIPTION:Speaker: Giulio Pasqualetti\n\nTitle: Probing the 2D SU(N) Ferm i-Hubbard Model with ultracold ytterbium\n\nAbstract: The Fermi-Hubbard mod el (FHM) describes the interplay between kinetic energy and onsite interact ion of particles on a lattice. Cold atoms in an optical lattice have proven to be a particularly suitable platform to probe its properties\, complemen ting analytical and numerical simulations. Most of the experimental works\, however\, have focussed so far on the SU(2) case\, featuring spin-1/2 part icles. In our experiment\, we implement the SU(N) FHM\, which describes par ticles with N spin components and presents a richer and still poorly unders tood physics compared with the SU(2) case. To do so\, we use ytterbium-173\ , which naturally features a SU(6)-symmetry in the ground state\, and allow s us to investigate the SU(N) FHM for N smaller or equal to 6. After loadin g the atoms in a 2D square optical lattice\, we probe the thermodynamics of the system looking at different observables as a function of temperature\, interactions and spin components\, and we benchmark our measurements with theoretical models. LAST-MODIFIED:20220602T163630Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210208T160000 DTEND;TZID=America/New_York:20210208T170000 DTSTAMP:20260828T094430Z UID:4vcrk9f2lccfvtoaltqhlruo2j@google.com RECURRENCE-ID;TZID=America/New_York:20210208T160000 CREATED:20210105T172544Z DESCRIPTION:Seminar will be conducted via zoom

    Speaker: Isabel Garci a\, KITP \;

    Title: P not PQ

    Abstract: Parity solutions to the strong CP problem are a compelling alternative to approaches based on Peccei-Quinn symmetry\, particularly given the expected violation of global symmetries in a theory of quantum gravity. The most natural of these solut ions break parity at a low scale\, giving rise to a host of experimentally accessible signals. I will discuss the status of the simplest parity-based solution in light of LHC data and flavor constraints\, highlighting the pro spects for near-future tests at colliders\, tabletop experiments\, and grav itational wave observatories. The origin of parity breaking and associated gravitational effects play crucial roles\, providing new avenues for discov ery through EDMs and gravity waves. These experimental opportunities underl ine the promise of generalized parity\, rather than Peccei-Quinn symmetry\, as a robust and testable solution to the strong CP problem.
    For zoom li nk please email mknouse@umd.edu LAST-MODIFIED:20210129T194726Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220407T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20220303T123000 EXDATE;TZID=America/New_York:20220310T123000 EXDATE;TZID=America/New_York:20220317T123000 EXDATE;TZID=America/New_York:20220324T123000 DTSTAMP:20260828T094430Z UID:7kricndssf147v6c22iib09spd@google.com CREATED:20220308T204637Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

    Speaker: Nikhil Karthik\, JLab

    Title and ab stract: tk     LAST-MODIFIED:20220308T204734Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211108T160000 DTEND;TZID=America/New_York:20211108T173000 DTSTAMP:20260828T094430Z UID:45gl7f716mpccpshg4k9q8rd8r@google.com RECURRENCE-ID;TZID=America/New_York:20211108T160000 CREATED:20210924T113938Z DESCRIPTION:Speaker: Yizhou Huang


    Title: Title: \; Decreased Transmon T1 and Increased Pe f rom High Resonator Drive Power

    Abstract: We discuss detrimental effe cts on the lifetime T1 and initial excited state population (Pe) of a 6 GHz Al/AlOx/Al transmon when pumping the read-out resonator at large powers. I n our device\, the qubit is coupled to an 8 GHz Al resonator that is in tur n coupled to an input-output transmission line for measuring the resonator. Using a low power dispersive readout\, we find T1 ~ 30us and Pe ~ 0.16%. O n the other hand\, when pumping the resonator at high powers\, slightly abo ve the Jaynes-Cummings nonlinear readout point[1]\, T1 decreases to 2 us an d the excited state population increases more than an order of magnitude to Pe ~ 10%. After a high power pulse\, T1 recovers on a time scale that is c onsistent with quasiparticle tunneling through the junction being the domin ant loss mechanism[2]\, which is further supported by studying voltage acro ss the transmon junction. On the other hand\, as we will discuss in a quali tative way\, Pe has a non-trivial dependence on the detuning of the drive f rom the qubit transition frequency.[1]Reed et al.\, Phys. Rev. Lett. 105\, 173601 (2010).
    [2]Wang et al.\, Nat. Commun. 5\, 5836 (2014)

    &nbs p\;
    Advisor: Benjamin Palmer


    PLEASE NOTE: TODAY"S SEMINAR I S VIRTUAL ON ZOOM: \;https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080746Z LOCATION:Virtual on ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Yizhou Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210219T170000Z DTEND:20210219T174500Z DTSTAMP:20260828T094430Z UID:59vi20b27fqhf77fkerddp515u@google.com CREATED:20210210T221340Z DESCRIPTION:Title : Optimal State Transfer and Entanglement Generation in Power-law I nteracting Systems \;
    Speaker : Minh Tran
     \;
    Time : 12 - 12:45pm\, Friday\, Feb. 19
    Seminar will be held via Zoom: https://umd.zoom.us/j/97 099328991 and Meeting ID : 970 9932 8991 \;
     \;
    Abstract:
    We present an optimal protocol for encoding an unknown qubit state into amultiqubit Greenberger-Horne-Zeilinger-like state and\, conseq uently\,transferring quantum information in large systems exhibiting power- law(1/r^α) intera ctions. For all power-law exponents α between < span>dand 2d+1\, where d is the dimension of the system\, the protocol yields apo lynomial speedup for α>\;2d and a superpolynomial speedup forα≤2d< /span>\, compared to the state of the art. For all α>\;d    \, theprotocol saturates the Lieb-Robinson bounds (up to subpolynomial corrections)\,thereby establishin g the optimality of the protocol and the tightness of thebounds in this reg ime. The protocol has a wide range of applications\, includingin quantum se nsing\, quantum computing\, and preparation of topologically orderedstates. In addition\, the protocol provides a lower bound on the gate count indigi tal simulations of power-law interacting systems. < /span> LAST-MODIFIED:20210210T221340Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS-JQI-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T143000Z DTEND:20211006T154500Z DTSTAMP:20260828T094430Z UID:1csh2c2glf21kh6ooksmgc89oi@google.com CREATED:20210922T133139Z DESCRIPTION:Title: A hidden variable model for universal quantum computati on with magic states on qubits
    Speaker: Robert Raussendorf (University of British Columbia)
    Time: Wednesday\, October 6\, 2021 - 10:30am
    Lo cation: Virtual Via Zoom: http s://umd.zoom.us/j/96079067479 Meeting ID: 960 7906 7479

    We show that every quantum computation can be described by a probabilistic update o f a probability distribution on a finite phase space. Negativity in a quasi probability function is not required in states or operations. Our result is consistent with Gleason’s theorem and the Pusey-Barrett-Rudolph theorem.Joint work with: Michael Zurel and Cihan Okay
    J-Ref: Phys. Rev. Lett. 125\, 260404 (2020)

    (Please note the earlier start time of 10:30 a.m . for this seminar.) LAST-MODIFIED:20211005T151930Z LOCATION:https://umd.zoom.us/j/96079067479 Meeting ID: 960 7906 7479 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Robert Raussendorf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T160000Z DTEND:20220413T170000Z DTSTAMP:20260828T094430Z UID:33575dubagh8jq6ma56ii8p1r2@google.com CREATED:20220207T165146Z DESCRIPTION:Speaker: TBA

    Title: TBA< b>

    Abstract: \; https://mse.umd.edu/seminar-series     LAST-MODIFIED:20220405T132521Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210426T110000 DTEND;TZID=America/New_York:20210426T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210426T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Topological Quantum Matter

    Speaker: M. Zahid Hasan\, Princeton University

    Abstract: Electrons organize in ways to give rise to distinct phas es of matter such as insulators\, metals\, magnets or superfluid or superco nductors. In the last ten years or so\, it has become increasingly clear th at in addition to the symmetry-based classification of matter\, topological consideration of wavefunctions plays a key role in determining distinct or new quantum phases of matter [see\, for an introduction\, \;Hasan & \; Kane\, Reviews of Modern Physics \;82\, 3045 (2010)]. \;

    I n this talk\, I briefly introduce these new topological concepts in the con text of their experimental realizations in quantum matter. As examples\, I present how tuning a topological insulator whose surface hosts an unpaired Dirac fermion can give rise to \;emergent Weyl fermion and “fractional” Fermi surfaces\; \;superconductors with helical Cooper pairing leading to novel Majorana platforms\, and strongly correlated magnetic\, Chern or many-body states of matter. \;These “topological quantum matter” harbor novel and unprecedented properties that may lead to the development of nex t generation quantum technologies. \;



    We are hosting the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and af filiates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210305T180622Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210223T181500Z DTEND:20210223T191500Z DTSTAMP:20260828T094430Z UID:1vr291o0upqfjln7ojc13j30d9@google.com CREATED:20210202T175504Z DESCRIPTION:Speaker: Prof. James Sethna\, Cornell University

    Title:& nbsp\; Sloppy Models\, Differential Geometry\, and Why Science Works

    Abstract: \;Models of systems biology\, climate change\, ecology\, com plex instruments\, and macroeconomics have parameters that are hard or impo ssible to measure directly. If we fit these unknown parameters\, fiddling w ith them until they agree with past experiments\, how much can we trust the ir predictions? We have found that predictions can be made despite huge unc ertainties in the parameters - many parameter combinations are mostly unimp ortant to the collective behavior. We will use ideas and methods from diffe rential geometry and approximation theory to explain sloppiness as a "hyper ribbon" structure of the manifold of possible model predictions. We show th at physics theories are also sloppy - that sloppiness may be the underlying reason why the world is comprehensible. We will present new methods for vi sualizing this model manifold for probabilistic systems - such as the space of possible universes as measured by the cosmic microwave background radia tion.

    Where: \;https://go.umd.edu/statphys_spring2021 LAST-MODIFIED:20210216T142630Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T170000Z DTEND:20211008T210000Z DTSTAMP:20260828T094430Z UID:7qfp0bp26g8q247emrlnm45i6r@google.com CREATED:20210929T180638Z DESCRIPTION:More information: \;


    https://ipst.um d.edu/research/burgers/events/annual-lectures-symposia

    Progra m:

    https://ipst.umd.edu/sites/defau lt/files/documents/burgers_posters/ProgramBurgersSymp2021.pdf LAST-MODIFIED:20211001T162954Z LOCATION:J. M. Patterson Building Room 2116 and on Zoom: https://go.umd.edu /BurgersSymposium2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Burgers Program for Fluid Dynamics Eighteenth Annual Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210219T180000Z DTEND:20210219T190000Z DTSTAMP:20260828T094430Z UID:32lcnr34k4fba369ldiraglhje@google.com CREATED:20210202T135153Z DESCRIPTION:Speaker: Allan Diebold\, Empire Innovation Professor of Nanocsc ale ScienceSUNY Polytechnic Institute

    Title: \;Metrology for Adv anced Transistor Devices and Materials

    Abstract: In this talk\, we d iscuss the measurement of materials and device structures critical to the n ext generation of integrated circuits. Specifically\, this presentation wil l cover measurements for new dielectric materials and nanowire/nanosheet tr ansistors known as Gate – all – Around (GAA) transistors. As transistor di mensions shrink\, the dielectric layer in the transistor gate must evolve t o increase its dielectric constant. This is typically done by changing the crystal phase of so called High - K dielectric layers. The X-ray methods u sed to determine the phase of the material will be presented. Another diff icult measurement challenges is non-destructively determining the feature d imensions and shape for complicated 3D structures. This presentation will review Mueller Matrix Spectroscopic Ellipsometry based scatterometry which uses the Rigorous Coupled Wave Approximation (RCWA) to solve Maxwell’s equa tions for a model structure and the resulting Mueller Matrix elements are c ompared to experimental results. Here we measured and characterized test s tructures used to develop etch process for the GAA transistors. We also dis cuss experimental measurement of nanowire test structures using critical di mension small angle X-ray scattering. This new method is being explored as a means of measuring feature dimensions for the most advanced transistor a nd memory circuits.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \; \; LAST-MODIFIED:20210211T140642Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T160000Z DTEND:20220303T170000Z DTSTAMP:20260828T094430Z UID:1h9kfbsjcr10c7b7112a9m8or6@google.com CREATED:20220207T174258Z DESCRIPTION:Speaker: Dr. Michael Pittelkow\, University of Copen hagen

    Title: Curved Aromatic Molecules and Anti-Aromatic Molecules
    Abstract: \;https://chem.umd.edu/events/curved-a romatic-molecules-and-anti-aromatic-molecules     LAST-MODIFIED:20220221T153555Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210305T170000Z DTEND:20210305T180000Z DTSTAMP:20260828T094430Z UID:0hqq9dnrs5bvu2064q41pjbp0v@google.com CREATED:20210224T125828Z DESCRIPTION:Title : Welcome to the Post-Quantum E ra: Jobs and Use Cases
    Speaker : Konstantinos Karagiannis
    & nbsp\;

    Time : 12 - 1pm\, Friday\, Mar. 5
    Seminar will be held via Zoom: https://umd.zoom.u s/j/95990412421 and Meeting ID : 959 9041 2421
     \;    Note: this is a special industry speaker seminar

    Abstract: We finally made it t o what seemed like sci-fi wishful thinking. Quantum computers are real and available on the cloud\, and their power is growing at a greater-than-Moore ’s-Law pace. What does this mean for those entering the job market soon? Wh at will we be using these qubit-loaded behemoths for? Join us for some info rmal Q&\;A about this post-quantum era we find ourselves within.

    K onstantinos Karagiannis is the Head of Quantum Computing Services at Protiv iti. He has been working in quantum information science since 2012\, and ha s spoken at conferences worldwide\, including Black Hat\, RSA\, GISEC\, and ISF.

    LAST-MODIFIED:20210225T173839Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS-JQI-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210430T190000Z DTEND:20210430T203000Z DTSTAMP:20260828T094430Z UID:3hco9ost6j38hdublqrnog8hta@google.com CREATED:20210429T150150Z DESCRIPTION: LAST-MODIFIED:20220509T135755Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=m7eaea23cfe241280df710178 3ec46b94 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: Quantum Characterization and Control: Theory\, Practic e and Potential TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210324T200000Z DTEND:20210324T210000Z DTSTAMP:20260828T094430Z UID:120r67moep5rhbnb7r9i9o1ugj@google.com CREATED:20210316T185158Z DESCRIPTION:
    New results on the Kpi puzzle: Direct CP violation in the decay B+ to K+ pi0 at LHCb

     \;Speaker: Will Park er\, University of Maryland \; \;Flavor physics is a powerful v enue to indirectly search for physics beyond \;the Standard Model.  \; Several anomalies have been observed in the decays of \;B mesons\, w hich have continued to persist with new data and have been \;explored a s potential hints of new physics. \; I will discuss a longstanding anom aly in the CP asymmetries of B decays to a kaon and pion\, known as the&nbs p\;K pi puzzle. \; I will present a new measurement\, the most precise to date\, \;of the direct CP asymmetry in the decay B+ to K+ pi0 at LHC b. This \;measurement is consistent with the previous measurements of t his quantity \;and significantly strengthens the anomaly.

    March 24\, 2021 at 4PM

    https://umd. zoom.us/j/96004266225

    LAST-MODIFIED:20210316T190929Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T160000 DTEND;TZID=America/New_York:20210125T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210512T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210201T160000 EXDATE;TZID=America/New_York:20210208T160000 EXDATE;TZID=America/New_York:20210215T160000 EXDATE;TZID=America/New_York:20210222T160000 EXDATE;TZID=America/New_York:20210301T160000 EXDATE;TZID=America/New_York:20210308T160000 EXDATE;TZID=America/New_York:20210315T160000 EXDATE;TZID=America/New_York:20210322T160000 EXDATE;TZID=America/New_York:20210329T160000 EXDATE;TZID=America/New_York:20210405T160000 EXDATE;TZID=America/New_York:20210412T160000 EXDATE;TZID=America/New_York:20210419T160000 EXDATE;TZID=America/New_York:20210426T160000 EXDATE;TZID=America/New_York:20210503T160000 EXDATE;TZID=America/New_York:20210510T160000 DTSTAMP:20260828T094430Z UID:7rcivgcj7b9nfuj8o0rivr3vn0@google.com CREATED:20210113T142920Z DESCRIPTION:Seminar will be conducted via zoom\n\nSpeaker: Camila Machado\, DESY\n\nTitle and abstract: tk\n\nFor zoom link please email mknouse@umd.e du LAST-MODIFIED:20210113T142920Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220727T150000Z DTEND:20220727T160000Z DTSTAMP:20260828T094430Z UID:1fru3f194v4ggspp4js00i7q1k@google.com CREATED:20220719T172701Z DESCRIPTION:Title: Dualities in one-dimensional quantum latt ice models: symmetric Hamiltonians and matrix product operator intertwiners
    Speaker: Laurens Lootens (Ghent University)
    Time: Wednesday\, July 27\, 2022 - 11:00am
    Location: ATL 3100A and Virtual Via Zoom: https://umd .zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09

    Meeti ng ID: 989 367 6372
    Passcode: abc123

    Recently\, we presented a sy stematic recipe for generating duality transformations in one dimensional l attice models. Our construction is based on a detailed understanding of the most general kind of symmetry a one-dimensional lattice model can exhibit: categorical symmetries. These symmetries are conveniently described in the language of tensor networks\, where they are represented as matrix product operators. For a given lattice model with such categorical symmetries\, th eir mathematical description in terms of bimodule categories allows us to g enerate all possible dual models\, as well as explicit matrix product opera tor intertwiners that implement the dualities at the level of the Hilbert s pace.

    In this talk\, I will provide an overview of these results by giving an introduction to matrix product operator symmetries\, the underlyi ng categorical structures and how they provide the right framework for stud ying dualities. I will discuss some well known examples to illustrate our f ramework\, and show how the categorical approach allows us to precisely rel ate the various symmetry sectors of dual models to each other.

    Based on arXiv:2008.11187 and arXiv:2112.09091


    < u>
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    Meeting ID: 989 367 6372
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    LAST-MODIFIED:20220719T172701Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc 123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Laurens Lootens TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210503T110000 DTEND;TZID=America/New_York:20210503T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210503T110000 CREATED:20210114T020453Z DESCRIPTION:Title:  \;Quantumness in the physics of AC electric power g rids

    Speaker:  \;Philippe Jacquod\, University of Geneva and HES -SO/Valais

    Abstract:  \;Covering areas as large as entire contin ents\, high-voltage power grids have a priori little to do with quantum mec hanics. Yet\, upon closer inspection\, interesting analogies emerge with qu antum / wave-coherent phenomena such as the Josephson effect\, vortices in superfluids or multiple coherent scattering. This is so\, because the opera tional state of AC power grids is determined by complex voltages at buses o n a two-dimensional network.

    In this talk I will give an introducti on to the equations describing the dynamics and the operational steady-stat e of AC power grids. Josephson physics directly emerges from the steady-sta te equations in the limit of very high voltages. When considering a power g rid on a meshed network\, this raises the possibility of vortex formation w ith associated persistent power currents [1]. I will discuss four dynamical mechanisms for vortex formation and their connection to quantum phase slip s in superconducting nanorings. Time pending\, I may briefly discuss multip le scattering of frequency-disturbances and how they can give rise to wave- coherent phenomena over thousands of miles in continental grids [2]. I will conclude with assessing how much of these analogies are relevant to today’ s power grid operation.

    [1] T. Coletta\, R. Delabays\, and Ph. Jacq uod\, “Topologically protected loop flows in high voltage AC power grids”\, New J. Phys. 18\, 103042 (2016)

    [2] M. Tyloo\, L. Pagnier\, and Ph . Jacquod\, "The key player problem in complex oscillator networks and elec tric power grids"\, Sci. Adv. 5\, eaaw8359 (2019)

    Host:  \;Vict or Yakovenko

    We are hosting the Spring 2021 JQI Seminars virtually a s Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will a lso be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210418T182407Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T193000Z DTEND:20210915T203000Z DTSTAMP:20260828T094430Z UID:7kkkvh9fhkf7kj9tk2o44ac6s1@google.com CREATED:20210902T165853Z DESCRIPTION:Title : How does a co-spatial return current affect solar flare accelerated electrons?

    Speaker Name: Meriem Alaoui Abdallaoui
    Sp eaker Institution : Goddard Space Flight Center

    Abstract : Solar fla res rapidly and efficiently accelerate a tremendous number of electrons at the tops of coronal loops. These energetic electrons then propagate both to ward the interplanetary medium and toward the lower and denser solar atmosp here. Over the course of the electrons’ transport\, a co-spatial counter-st reaming return current is induced\, thereby balancing the current density. In response to the return current electric field\, a fraction of the ambien t electrons will be accelerated into the runaway regime. I will present a m odel in which an accelerated electron beam drives a steady-state\, sub-Drei cer co-spatial return-current electric field\, which locally balances the d irect beam current and freely accelerates a fraction of background (return- current) electrons. The model is self-consistent\, i.e.\, the electric fiel d induced by the co-evolution of the direct beam and the runaway current is considered. I will show how return currents affect the atmospheric thermal response to an injected electron beam\, X-ray observations and the acceler ation/injection region. The results depend on the injected beam flux densit y\, the temperature and density of the background plasma. Specifically\, I will show that (1) the return current electric field can return a significa nt number of suprathermal electrons to the acceleration region\, where they can be further accelerated to higher energies\, runaway electrons can be a few tens of percent of the return current flux returning to the nonthermal beam’s acceleration region\, (2) the energy gain of the suprathermal elect rons can be up to 10−35 keV\, (3) the heating rate in the corona can be red uced by a factor of three for medium range injected fluxes in comparison to models which neglect the runaway component.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210902T165853Z LOCATION:Location: Virtual\; contact swisdak@umd.edu for address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220126T170000Z DTEND:20220126T180000Z DTSTAMP:20260828T094430Z UID:5vd7s5v4qamd3b058dmf2ikg70@google.com CREATED:20220120T140459Z DESCRIPTION:Speaker: Johnpierre Paglione\, Director\, Maryland Quantum Mate rials Center

    Title: Topological Superconductivity in Nearly Ferromag netic \;UTe2


    Abstract: Top ological superconductivity has attracted great interest in condensed matter physics because of its potential applications in quantum computing. Spin-t riplet superconductors are one promising class that can host the topologica l excitations of interest\, but experimental realizations are few and far b etween. Here we report the discovery and properties of superconductivity in UTe2\, a material closely related to known ferromagnetic superc onductors such as UGe2\, URhGe\, and UCoGe\, but lacking long-ra nge magnetic order. Several experimentally measured properties feature tell tale indications of an unconventional energy gap and a spin-triplet pairing state that is consistent with the presence of strong magnetic fluctuations due to an incipient quantum critical point. Furthermore\, the superconduct ivity in UTe2 \;is remarkably robust to extremely high magne tic fields\, showing re-entrant pairing up to at least 65 Tesla. \; I w ill review basic properties and our detailed investigations of the gap stru cture\, relation to incipient magnetic order and Kondo coherence\, as well as indications of an anomalous normal state fluid that suggest many surpris es await for this exotic material.

    Bio:

    Johnpierre Paglione has see ded a world-class effort on quantum materials research at UMD\, leading the collaborations of several faculty that have brought Maryland to the forefr ont of research on superconductivity\, topological materials and strongly c orrelated systems. Having contributed to several fields of experimental con densed matter research through both single-crystal synthesis and ultra-low temperature transport\, thermodynamic and spectroscopic exploration of nove l phenomena\, Paglione’s research is a blend of materials exploration and e lucidation of quantum phenomena. As Director of the \;Maryland Quan tum Materials Center\, with a membership of over 100 personnel\, a sta te-of-the-art materials synthesis facility and an extensive measurement sui te\, Paglione commits QMC resources to hosting the annual Fundamentals of Q uantum Materials Winter School\, a successful hands-on training program and basis for this work. Paglione is the recipient of a National Science Found ation CAREER Award and an Early Career Award from the Department of Energy\ , is a Materials Synthesis Fellow in the EPiQS program of the Gordon and Be tty Moore Foundation and a Fellow of the Quantum Materials Program of the C anadian Institute for Advanced Research. Dr. Paglione earned his PhD from t he University of Toronto in Canada.

    LAST-MODIFIED:20220120T140459Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220502T190000Z DTEND:20220502T203000Z DTSTAMP:20260828T094430Z UID:73bmcphi6ekidng310kbabv3gm@google.com CREATED:20220124T160312Z DESCRIPTION:Speaker: Csaba Csaki\, Cornell

    Title: Explorin g the phases of gauge theories via Anomaly Mediated Supersymmetry Breaking (AMSB)".

    Abstract: Finding the vacuum structure of strongly coup led gauge theories is one of the important unsolved questions in particle p hysics. Within supersymmetric (SUSY) theories many of these questions have been largely resolved in the 1990's following the work of Seiberg and other s\, however so far we have not been able to convincingly connect these resu lts to their non-supersymmetric counterparts. Recently Murayama proposed to use anomaly mediated supersymmetry breaking (AMSB) to introduce the SUSY   breaking terms which allows finding results consistent with the qualitative expectations for the structure of the non-SUSY theories. In this talk I fi rst show how to apply this method to a class of chiral gauge theories based on antisymmetric and symmetric representations\, which leads us to propose novel symmetry breaking patterns for the vacuum of these theories\, and ca lls for modification of the old tumbling picture of confinement in chiral g auge theories. I then apply the method to the SO(N) series and show that fo r F<\; 3/2 (N-2) the theory will be confining\, where the dynamics of con finement is monopole condensation\, and identify the resulting global symme try breaking pattern.
     LAST-MODIFIED:20220502T132941Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20260828T094430Z UID:56roaeh2u0oa8h36h5bve6v1ai@google.com CREATED:20220207T182538Z DESCRIPTION:Speaker: Dr. Karen Fleming\, Johns Hopkins University

    Title: SurA is a Groove-y Chaperone that Expands Unfolded Outer Mem brane Proteins

    Abstract: https://chem.umd.edu/events/speaker-karen-fleming< /span> LAST-MODIFIED:20220427T164639Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210402T170000Z DTEND:20210402T180000Z DTSTAMP:20260828T094430Z UID:1q7l3tch2g8cink8tejmv26qb7@google.com CREATED:20210202T141113Z DESCRIPTION:Speaker: Jennifer L. M. Rupp\, \;Thomas Lord Associate Prof essor\, Materials Science and Engineering \;Massachusetts Institute of Technology

    Title: \;"Lithionics" - On the Design of Lit hium Oxides for Solid State Batteries and Novel Neuromorphic Computing Func tions \;

    Abstract: Next generation of energy storage may largely benefit from fast Li· ceramic electrolyte conductors to allow for safe and efficient batteries. With recent discoveries in thin film processing solid -state lithium ion conductors\, such as Li-garnets and LIPON or LiSICON-bas ed solids\, have been recently considered as candidate materials not only f or next-generation solid-state batteries but also for neuromorphic computin g via memristors owing to the fast ionic transport in the solid-state elect rolyte.

    In the first part of this talk\, we review current needs and challenges in the field of solid state batteries. We underline the advanta ges of various Li solid-state conductor materials and reflect on opportunit ies of thin film processing\, being a requirement to define precisely the L ithium stoichiometries and related electronic state changes for transition metal ions\, miniaturize the device\, and reach high energy/information den sities for energy storage\, computation\, and sensing.

    In the second part\, we focus on Li-film processing and controlling Lithium stoichiometr ies to reach fast conductive phases for Li garnets and Li titanates as soli d state battery components\, and memristive neuromorphic computing units. I nsights on structure-phase-transport interaction and implications on perfor mances will be exemplified for energy storage aiming high energy densities\ , and modulations of synaptic artificial weights through lithium induced me tal-to-insulator transitions in lithium titanate memristors.


    via Zoom
    Sherri Tatum
    statum1 2@umd.edu
    https://mse.u md.edu/seminar-series \; \; LAST-MODIFIED:20210324T205832Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221005T193000Z DTEND:20221005T213000Z DTSTAMP:20260828T094430Z UID:2sf0sm7kidef0fk8dfq4l1jnbt@google.com CREATED:20220815T130613Z DESCRIPTION:Speaker: Dr. Eric Detsi\, Associate Professor\, Materials Scien ce and Engineering\, University of Pennsylvania

    Title: TBA


    Abstract: \;https://directory.seas.upenn.edu/ eric-detsi/ LAST-MODIFIED:20220815T130613Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221207T203000Z DTEND:20221207T223000Z DTSTAMP:20260828T094430Z UID:4qv713gndju79sdbssuha71k1s@google.com CREATED:20220815T131717Z DESCRIPTION:Speaker: \;TBA

    Title: TBA

    Abstr act: TBA LAST-MODIFIED:20220815T131718Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220208T180000Z DTEND:20220208T190000Z DTSTAMP:20260828T094430Z UID:0hb5svbgdto705red6bvtehblv@google.com CREATED:20220207T170029Z DESCRIPTION:Speaker: PhD Defense: Emily Luteran\, UMCP

    Title: Biophy sical and Structural Characterization of the d(CGA) Triplet Repeat Motif

    Abstract: \;https://chem.umd.edu/events/biophysical-and-structural-characteri zation-dcga-triplet-repeat-motif LAST-MODIFIED:20220207T170029Z LOCATION:BMS Building\, Room 2118 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220211T180000Z DTEND:20220211T184500Z DTSTAMP:20260828T094430Z UID:5ghb7jnn5cf1imknlpr67brg0q@google.com CREATED:20220208T182757Z DESCRIPTION:Title: Simulation Complexity of Many-Body Localized Systems\nS peaker: Adam Ehrenberg (QuICS)\nTime: Friday\, February 11\, 2022 - 1:00 pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9616017 7762\n\nWe investigate the difficulty of classically simulating evolution u nder many-body localized (MBL) Hamiltonians. Using the defining feature tha t MBL systems have a complete set of local integrals of motion (LIOMs)\, we demonstrate a transition in the classical complexity of simulating such sy stems as a function of evolution time. On one side\, we construct a quasipo lynomial-time tensor-network-inspired algorithm that can simulate MBL syste ms evolved for any time polynomial in the system size. On the other\, we pr ove that classical simulation becomes formally hard after an exponentially long evolution time\, assuming widely believed conjectures in complexity th eory. If there is time\, we will also discuss the gate complexity of quantu m simulation for MBL systems and show that it is sublinear in evolution tim e.\n\n(Pizza and drinks served after the talk.) LAST-MODIFIED:20220208T182757Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Adam Ehrenberg TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211101T203000Z DTEND:20211101T213000Z DTSTAMP:20260828T094430Z UID:7mrgakr7u3skjgrg78jd5ibnr7@google.com CREATED:20211009T143206Z DESCRIPTION:Title: Cosmic rays coming of age\n\nSpeaker: Philipp Mertsch\, Institute for Theoretical Particle Physics and Cosmology (TTK)\, RWTH Aache n University\, Aachen\, Germany\n\nAbstract: Cosmic rays (CRs) are messenge rs of the violent universe and interpretations of CR measurements can be us ed to infer the properties of such environments as far as overall energetic s\, structure and dynamics are concerned. In addition\, CRs have a dynamica l effect in a variety of environments\, shaping not only the medium that th ey themselves travel in\, but also affecting other constituents\, e.g. magn etic fields\, radiation and the thermal gas. We will review the status of G alactic CRs as of mid/late 2021\, both from the observational and the theor etical side. We will summarise the new data from space-borne experiments on CR electrons and positrons\, proton and helium as well as heavier nuclei a nd their isotopes. We will cover a couple of novel aspects in the modeling of acceleration of CRs at non-relativistic shocks and in their feedback on Galactic scales.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211009T143207Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T163000Z DTSTAMP:20260828T094430Z UID:6t3ql5cgnnn2s7vork2bbmpqpd@google.com CREATED:20220323T165056Z DESCRIPTION:Speaker: Jianwei Qiu\, JLab

    Title:
    Exclu sive massive photon-pair production in pion-nucleon collisions for extracti ng generalized parton distributions

    Abstract:Generalized parton dist ribution functions (GPDs) are fundamental quantum correlation functions car rying rich information on internal quark-gluon landscape inside a hadron. In this talk\, I will argue that exclusive massive photon-pair production i n pion-nucleon collisions can be systematically studied in terms of QCD fac torization approach if the photon's transverse momentum pT with respect to the colliding pion is sufficient large. This exclusive scattering amplitud e can be factorized into universal pion's distribution amplitude (DA) and n ucleon's GPD\, convoluted with an infrared safe and perturbatively calculab le short-distance hard part. The correction to this factorized expression is suppressed by powers of 1/pT. I will show quantitatively that this new type of exclusive processes is not only complementary to existing processes for extracting GPDs\, but also capable of providing an enhanced sensitivi ty to the momentum fraction x-dependence of both DAs and GPDs. I will also introduce a couple of new and related exclusive processes to enhance our a bility to extract GPDs.     LAST-MODIFIED:20220327T160534Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220404T190000Z DTEND:20220404T203000Z DTSTAMP:20260828T094430Z UID:4hor8penl4bpakd5n1rts36vfh@google.com CREATED:20220120T141137Z DESCRIPTION:Speaker: Robert Lasenby\, Stanford University

    Title: New particles and collective effects

    Abstract: There are man y ways to search for new particles beyond the Standard Model\, such as dete cting a relic dark matter abundance\, or production in high-energy processe s. To understand these\, one needs to calculate how the new particles inter act with Standard Model matter. Sometimes\, one can simply calculate Feynma n diagrams between a few particles. However\, in dense Standard Model envir onments\, coherent interactions with many Standard Model particles can be v ery important\, and can affect the rates of processes involving new particl es by orders of magnitude. In this seminar\, I will discuss these effects i n different scenarios\, including particle production in stars\, dark matte r scattering in astrophysical systems and in the laboratory\, and absorptio n of light bosonic dark matter in experiments.
     LAST-MODIFIED:20220329T173655Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T203000Z DTEND:20220302T214500Z DTSTAMP:20260828T094430Z UID:35dfqpqslc12bnuit757jtc5s5@google.com CREATED:20220228T183037Z DESCRIPTION:Molecular Coupling Competing wi th Defects Within Insulator of the \;Magnetic Tunnel Junction-based Molecular Spintronics Devices
    Pawan Tyagi*\, Hayden Brown\, Andrew G rizzle\, Christopher D'Angelo\, Bishnu R. Dahal\,
    Center for Nanotec hnology Research and Education\, Mechanical Engineering\, University of the District of Columbia\, Washington DC-20008\, USA
    Corresponding Author E mail: \;ptyagi@udc.edu
     \ ;
    ABSTRACT: \;Nearly 70 years old dream of incorporating molecule as the device element is still challenged by competing defects in almost every experimentally tested molecular device approach. This paper fo cuses on the magnetic tunnel junction (MTJ) based molecular spintronics dev ice (MTJMSD) method. An MTJMSD utilizes a tunnel barrier to ensure a robust and mass-producible physical gap between two ferromagnetic electrodes.&nbs p\; Molecular device channels are covalently bonded between two ferromagnet s across the insulating barrier. Our prior studies showed that molecule ind uced strong coupling produced several anomalous attributes at room temperat ure-including current suppression1\, spin photovoltaic effect2\, large resistance change3\, and highly corre lated magnetic systems4\, \;5. MTJMSD approach may benefit from MTJ's industrial p ractices\; however\, the MTJMSD approach still needs to overcome additional challenges arising from the inclusion of magnetic molecules in conjunction with competing defects6. An insulating barrier may possess a variety of potential def ects arising during the fabrication or operational phase. This paper descri bes an experimental and theoretical study of molecular coupling between fer romagnets in the presence of the competing coupling via an insulating tunne l barrier. We discuss the experimental observations of hillocks and pinhole -type defects producing inter-layer coupling that compete with molecular de vice elements. We performed theoretical simulations to encompass a wide ran ge of competition between molecules and defects. Monte Carlo Simulation was used for investigating the defect-induced inter-layer coupling on MTJMSD. Our research may help understand and design molecular spintronics devices u tilizing various insulating spacers such as aluminum oxide(AlOx) and magnes ium oxide (MgO) on a wide range of metal electrodes. This paper intends to provide practical insights for researchers intending to investigate the mol ecular device properties via the MTJMSD approach and do not have a backgrou nd in magnetic tunnel junction fabrication. We are endeavoring to utilize M TJ Testbed to harness quantum properties of paramagnetic molecules and solv ing molecular spintronic device fabrication roadblocks.
     \; \;Bi ography
    Prof. Pawan Tyagi's expertise is in the area of integrating nano materials into devices and sensors for advancing futuristic computer techno logy\, biomedical devices\, energy technology\, and advanced manufacturing. He has made a seminal contribution in the area of tunnel junction-based mo lecular spintronics devices. Prof. Tyagi has obtained patent in a new appro ach of making molecular devices. He has also made a significant contributio n in the surface improvement of complex metal additive manufacturing compon ents and collaboratively resaerch with numerous Department of Energy Indust ries. He is also a founding director of the NSF-funded Center for Nanotechn ology Research and Education(CNRE). Prof. Tyagi leads a consortium of four universities and three DOE-NNSA industries to develop resaerch driven techn ologically advanced workforce. He has founded UDC Nanoscale Fabrication and Measurement Laboratory (NFML) to support undergraduate to postdoctoral sch olar training. At the University of the District of Columbia\, he serves as the founder and director of the Nanotechnology Application Laboratory and leads several federally funded projects. Prof. Tyagi has published more tha n 60 peer-reviewed publications and two patents. Prof Tyagi is a passionate teacher. He has invented a new student active teaching approach\, namely S tudent Presentation Based Effective Teaching (SPET). SPET is especially sui table for busy resaerch active and new faculty teaching technologically adv anced courses. He is also one of the pioneers who implemented emotional and positive intelligence training in engineering courses to develop life-long learning skills and mental resilience in challenging life circumstances. P rof. Tyagi has 24 years of experience in materials science arising from his BS and MS in metallurgical and materials engineering at the Indian Institu te of Technology(IIT Kanpur and IIT Roorkee). His diverse materials prowess developed from the experience of working with meter scale objects in a met allurgical alloy steel plant and molecular-scale nanomaterials in doctoral study at the University of Kentucky and postdoctoral research at Johns Hopk ins University.  \; \; \; \; \; \; \; \;&nb sp\; \; \; \; \; \; \; \; \; \; \;& nbsp\; \; \; \; \; \; \; \; \; \; \ ; \; \; \; \;
    1. \; \; \; \; \ ; \; \; \; \; \; \; P. Tyagi\, C. Riso and E. Frieb e\, Organic Electronics \;64\, 188-194 (2019).
    2. \; \; \; \; \; \; \; \;&nb sp\; \; \; P. Tyagi and C. Riso\, Nanotechnology \;30  \;(49)\, 495401 (2019).
    3. \; \;&n bsp\; \; \; \; \; \; \; \; \; P. Tyagi and E. Friebe\, J. Mag. Mag. Mat. \;453\, 186-192 (201 8).
    4. \; \; \; \; \; \; \;&nb sp\; \; \; \; P. Tyagi and C. Riso\, Organic Electronics \; 75\, 105421 (2019).
    5. \; \;& nbsp\; \; \; \; \; \; \; \; \; P. Tyagi\, C . Baker and C. D'Angelo\, Nanotechnology \;26\, 30 5602 (2015).
    6. \; \; \; \; \; \;& nbsp\; \; \; \; \; P. Tyagi\, H. Brown\, A. Grizzle\, C. D’ Angelo and B. R. Dahal\, Scientific Reports \;11&n bsp\;(1)\, 1-13 (2021).
     \;

     \;
    < /table>
    Igor Andreoni (Caltech)

    Title: Results from triggered and un-triggered searches for neutron star merger c ounterparts

    Abstract: Mergers of binary neutron star systems are grea t multi-messenger sources. These mergers generate gravitational waves (GWs) detectable with ground-based interferometers and can be accompanied by lum inous electromagnetic (EM) radiation. The combined detection of GW and EM s ignals can enable many types of science\, from cosmology to fundamental phy sics and astrophysics of energetic phenomena. However\, with only one well- studied multi-messenger source\, GW170817\, many questions remain. For exam ple\, what is the true binary neutron star merger rate? Are the merger ejec ta always rich in r-process elements? What are the EM counterparts to neutr on star–black hole mergers? The discovery of a population of kilonovae – th e optical/infrared counterparts to neutron star mergers – can allow us to a ddress these and more questions. In this colloquium\, I will present result s from observations carried out by the GROWTH collaboration using wide-fiel d instruments such as the Dark Energy Camera and the Zwicky Transient Facil ity\, some during LIGO/Virgo O3 and some on-going. Finally\, I will discuss how we have used systematic triggered and un-triggered searches to underst and the kilonova luminosity function and constrain the neutron star merger rate. \;

    For Zoom meeting information\, please contact John Culli nan (jcullina@umd.edu)

     \; LAST-MODIFIED:20210429T150150Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211005T160000 DTEND;TZID=America/New_York:20211005T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211005T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: Marianna Safronova\, University of Delaware\n\nTitle: Quantum Technologies for New-physics Discoveries\n\nAbstract: The extraordi nary advances in quantum control of matter and light have been transformati ve for atomic and molecular precision measurements enabling probes of the m ost basic laws of Nature to gain a fundamental understanding of the physica l Universe. Exceptional versatility\, inventiveness\, and rapid development of precision experiments supported by continuous technological advances an d improved atomic and molecular theory led to rapid development of many ave nues to explore new physics. I will give a broad overview of atomic and mol ecular physics searches for physics beyond the standard model. Several exam ples will be highlighted\, including searches for permanent electron electr ic-dipole moment that probe new TeV-scale physics\, dark matter searches wi th atomic and nuclear clocks\, and new ideas in gravitational wave detectio n with atomic quantum sensors.\n \nHosted by Steve Rolston LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building Rm 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210420T171500Z DTEND:20210420T181500Z DTSTAMP:20260828T094430Z UID:3pn0cjuktlf1tpd1v7r1f8tpqt@google.com CREATED:20210202T180339Z LAST-MODIFIED:20210322T144239Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211018T160000 DTEND;TZID=America/New_York:20211018T173000 DTSTAMP:20260828T094430Z UID:6cac7bc7fc6lnjtierpbjsgtn5@google.com RECURRENCE-ID;TZID=America/New_York:20211018T160000 CREATED:20210924T113733Z DESCRIPTION:Speaker: Jingnan Cai
    < /tr>


    Title: \;Effect of Coupling on Hysteretic rf SQ UID Metamaterials

    Abstract: \;Radio frequency Superconducting Qu antum Interference Device (rf SQUID) has been established as a viable build ing block for microwave frequency metamaterials [1\,2]. The single rf SQUID resonance frequency is tunable under applied dc flux\, with a period of on e flux quantum and the upper-frequency range scaling as1+rf. The previous e xperimental works restricted the parameter rf below unity to avoid hysteres is\, and limited the coupling strength among SQUIDs to small and negative v alues\, which resulted in single-SQUID like behaviors. In this work\, we ha ve built new arrays of rf SQUID meta-atoms in the hysteretic regime (rf > \;1) with strong negative and positive couplings. We experimentally observe d period doublings in the dc flux tunability\, and band gap formations\, bo th of which emerged from collective behaviors of a strongly interacting and highly nonlinear system. These nontrivial behaviors demonstrated the poten tial for the rf SQUID metamaterial as a platform to study many-body physics .

     \;
    Advisor: \; Steve Anlage \;
    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080713Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210226T180000Z DTEND:20210226T190000Z DTSTAMP:20260828T094430Z UID:43ojues6877u463eojjfahcce3@google.com CREATED:20210202T135533Z DESCRIPTION:Speaker: Jessica Krogstad\, Assistant Professor\, Materials Sci ence and Engineering
    University of Illinois\, Urbana-Champaign

    Ti tle: \;Exploring the Potential of Concentrated Point Defects: Their Rol e in Mass Transport\, Microstructural Evolution and Material Functionality< br>
    Abstract: Point defects are ubiquitous within materials. \; In m any cases these defects contribute to useful material functionality but in excess they can also lead to degradation. \; Here we present several vi gnettes in which concentrated populations of point defects interact with mi crostructural features resulting in new perspectives on phase transformatio ns and diffusion kinetics. \; We will approach this discussion from two angles: material systems wherein the excessive point defect population pre dominantly arises through materials synthesis choices and the other in whic h point defects are introduced via bombardment of an already crystalline sy stem. \; In the former\, the evolution of defects are driven by both in trinsic materials properties such as the stacking fault energy and extrinsi c parameters such as substrate temperature and plasma energy. \; In the later\, the crystalline lattice must respond and adapt to the flux of defe cts. \; However\, in both cases\, when the resulting nonequilibrium mat erials are allowed to relax\, they do so in unexpected ways. \; We will present these observation as well as the broader potential of nonequilibri um point defect populations in understanding microstructural evolution\, ma ss transport and material functionality.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series LAST-MODIFIED:20210216T142340Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210917T160000Z DTEND:20210917T164500Z DTSTAMP:20260828T094430Z UID:4pl55ro2hbcrlhgnk040vq8e70@google.com CREATED:20210915T022522Z DESCRIPTION:Title: Quantum simulations of non-ergodic phenomena with trapp ed ions\nSpeaker: Will Morong (JQI)\nTime: Friday\, September 17\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9 9484119207\n\nRecent years have seen the development of isolated quantum si mulator platforms capable of exploring interesting questions at the frontie rs of many-body physics. We describe our platform\, based on a chain of Ytt erbium ions in a linear trap\, and describe its capabilities\, which includ e long-range spin-spin interactions and single-site manipulation and readou t. We then describe some recent studies undertaken with this machine\, focu sing on two. The first is the observation of domain-wall confinement\, in w hich the long-range interactions cause individual domain walls to become bo und into meson-like quasiparticles. The second\, observation of Stark many- body localization\, in which a linearly increasing gradient halts thermaliz ation in favor of a state similar to disorder-induced many-body localizatio n. Finally\, we discuss these observations through the lens of Hilbert spac e fragmentation\, which may provide a unifying framework for these distinct forms of ergodicity breaking.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210915T022522Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Will Morong TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T160000Z DTEND:20220204T170000Z DTSTAMP:20260828T094430Z UID:3po84br06ri5jt0berolhcs7ko@google.com CREATED:20220127T191545Z DESCRIPTION:Speaker: Daniel Bulmash (University of Maryla nd)
    Location: Zoom
    Title: \;Anomalies in (2+1)D sym metry-enriched topological phases \; \;
    Abstract: \;T opological phases of matter\, like fractional quantum Hall systems\, can ho st anyon excitations with fractional electric charge. More generally\, when topological phases with anyons have global symmetries\, the anyons can car ry fractional quantum numbers under those symmetries. Remarkably\, some cho ices of fractional quantum numbers are anomalous\, that is\, they are physi cally allowed to exist\, but only when the (2+1)D system lives on the surfa ce of a bulk (3+1)D symmetry-protected topological phase like a topological insulator. Given abstract algebraic data specifying these quantum numbers\ , I will explain how to determine whether it is anomalous and\, if so\, how to describe the required bulk theory.
    Host: Jiabin Yu
    Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1 hWUC9zK2J0eXp1NzMvamtNZThDUT09

    Email emartin3@umd.edu for any questions.     LAST-MODIFIED:20220324T151727Z LOCATION:Zoom SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CMTC Zoom Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T180000Z DTEND:20211210T224500Z DTSTAMP:20260828T094430Z UID:50t8vhcanmlh15unamdovia2qk@google.com CREATED:20211203T150928Z DESCRIPTION:Speaker Name: Multiple speakers from various institutions
    Sp eaker Institution : UMD - Astronomy\, UMD - Physics\, GSFC\, GMU/NRL

    Title : Minisymposium on Neutron Stars and NICER

    Schedule
    1:00-2 :00 PM Lunch outside conference room (ATL 2400)
    2:00-2:15 PM Setup and i ntroduction
    2:15-2:45 PM Paulo Bedaque (UMd physics): the nuclear physic s of dense matter
    2:45-3:15 PM Megan DeCesar (GMU/NRL): high pulsar mass es from radio timing
    3:15-3:45 PM Zorawar Wadiasingh (GSFC): neutron sta r EOS from gravitational waves and multimessenger observations
    3:45-4:15 PM Break
    4:15-4:45 PM Alex Dittmann (UMd astro): inference of neutron s tar radii using NICER observations
    4:45-5:15 PM Cecilia Chirenti (UMd/GS FC): future constraints from gravitational waves
    5:15-5:45 PM General di scussion


    Notes: Lunch will be provided outside of 2400 ATL begin ning at 1:00 p.m. Presentations will begin at approximately 2:00-2:15. Plea se wear a mask if you are in attendance\, but presenters may speak without a mask if they are at least 6 ft. from the audience.

    Contact Name: J ohn Cullinan
    Contact E-Mail: \;jcu llina@umd.edu LAST-MODIFIED:20211203T150928Z LOCATION:Room: ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220705T150000Z DTEND:20220705T160000Z DTSTAMP:20260828T094430Z UID:3dt0ql6ksco2h0a1opo9e8ar5g@google.com CREATED:20220609T210304Z DESCRIPTION:Bowen Yang (Caltech)\n\nDetails TBA LAST-MODIFIED:20220609T210304Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220811T180000Z DTEND:20220811T190000Z DTSTAMP:20260828T094430Z UID:6h2g7ute0mv7co13306danegrb@google.com CREATED:20220729T023414Z DESCRIPTION:Title: Uncertainty Relations from Graph Theory\nSpeaker: Kiar a Hansenne (Universität Siegen)\nTime: Thursday\, August 11\, 2022 - 2:00p m\nLocation: Virtual Via Zoom: https://um d.zoom.us/j/7068476897\n\nQuantum measurements are inherently probabili stic. Further defying our classical intuition\, quantum theory often forbid s us to precisely determine the outcomes of simultaneous measurements. This phenomenon is captured and quantified through uncertainty relations. Altho ugh studied since the inception of quantum theory\, this problem of determi ning the possible expectation values of a collection of quantum measurement s remains\, in general\, unsolved.\n\nIn this talk\, we will go over some b asic notions of graph theory that will allow us to derive uncertainty relat ions valid for any set of dichotomic quantum observables. We will then spec ify the many cases for which these relations are tight\, depending on prope rties of some graphs\, and discuss a conjecture for the untight cases. Fina lly\, we will show some direct applications to several problems in quantum information\, namely\, in constructing entropic uncertainty relations\, sep arability criteria and entanglement witnesses. LAST-MODIFIED:20220729T023414Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/7068476897 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Kiara Hansenne TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211116T160000 DTEND;TZID=America/New_York:20211116T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211116T160000 CREATED:20200116T204737Z DESCRIPTION:

    Irving and Renee Milchberg Endowed Lecture


    Speaker: Jim Glanz\, Ph.D.\, New York Times

    Title: The Public Relations Machine in Science: A Self -Inflicted Wound?

    Abstract: \; Scientists have legitimate reason s to worry that reporters will not cover important research\, will not accu rately portray complex findings\, or will sensationalize breakthroughs that require caveats. Unfortunately\, the P.R. apparatus that scientists create d and support has made the situation far worse. The science P.R. machine di sincentivizes the kind of ambitious reporting that receives prominence – an d therefore readers – in major publications\, and drives out talented journ alists who refuse to be herded by embargoes and other restrictions. I will discuss how by trying to promote and protect their work\, scientists have i nstead damaged science journalism and helped to erode public confidence in science itself. \; \;


    LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T150000Z DTEND:20220504T160000Z DTSTAMP:20260828T094430Z UID:5i00qfdsh263t7jg0cgmd79600@google.com CREATED:20220207T164303Z DESCRIPTION:Speaker: Professor Monica Olvera de la Cruz\, Northw estern University

    Title: Control of Soft Matter

    Abstract:& nbsp\;    Heterogeneousmolecules such as amphiphiles and biopol ymers are ubiquitous components of lifeand physical sciences. In this talk\ , I will describe how to control theorganization and key functions of heter ogeneous molecules into functionalstructures such as catalytic closed shell s and co-assemblies ofpolyelectrolytes with enzymes into membranes that mim ic organelles.

    LAST-MODIFIED:20220429T125134Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220225T160000Z DTEND:20220225T170000Z DTSTAMP:20260828T094430Z UID:0ka9c76j2beivg95hjblhuld0n@google.com CREATED:20220207T170900Z DESCRIPTION:Title: Fundamental effects of noise and error mitigation on th e trainability of variational quantum algorithms\nSpeaker: Samson Wang (Im perial College London )\nTime: Friday\, February 25\, 2022 - 11:00am\nLoca tion: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99348805989\n\ nVariational Quantum Algorithms (VQAs) are viewed as amongst the best hope for near-term quantum advantage. A natural question is whether noise places fundamental limitations on VQA performance. In the first part of this talk \, we show that noise can severely limit the trainability of VQAs by expone ntially flattening the optimization landscape and suppressing the magnitude s of cost gradients. Specifically\, for the class of local Pauli noise cons idered\, we prove that the gradient vanishes exponentially in the number of qubits n if the depth of the ansatz grows linearly with n. In the second p art of this talk\, we consider whether error mitigation (EM) techniques can remedy these effects and improve trainability. We find that for a broad cl ass of EM strategies\, these scaling effects due to noise cannot be resolve d without committing exponential resources elsewhere. Moreover\, EM can eve n itself further impair trainability. LAST-MODIFIED:20220207T170900Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99348805989 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Samson Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210824T180000Z DTEND:20210824T190000Z DTSTAMP:20260828T094430Z UID:7jpehs2iui7bffqrgso8onqm4p@google.com CREATED:20210816T112810Z DESCRIPTION:
    Speaker: Batoul Banihashemi\, UMD

    Title: Thermodynam ic ensembles with cosmological horizons

    Abstract: The entropy of a d e Sitter horizon was derived long ago by Gibbons and Hawking via a gravitat ional partition function. Since there is no boundary at which to define the temperature or energy of the ensemble\, the statistical foundation of thei r approach has remained obscure. We introduce an artificial "York" boundary with a fixed size and either canonical or microcanonical boundary conditio ns\, so that the path integral defines either the partition function or the density of states. The ensembles include configurations with a black hole horizon inside the boundary\, or a cosmological horizon outside. We identif y the dominant configurations for different spherically symmetric ensembles \, and estimate the path integrals using their actions. At high enough temp erature a metastable black hole phase exists and has lower free energy than empty de Sitter space\, but the lowest free energy corresponds to a cosmol ogical horizon with de Sitter radius\, which is an endpoint of the configur ation space. A dynamical process that could drive the system towards this e ndpoint (and others) will be discussed.

    Seminar Recording LAST-MODIFIED:20210825T122831Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T203000Z DTEND:20220411T213000Z DTSTAMP:20260828T094430Z UID:3m68afjlaimq10mskisnl63a51@google.com CREATED:20220324T155000Z DESCRIPTION:Title: \;Cosmogenic Boosted Dark Matter

    Speaker: Doo jin Kim\, Texas AM University

    Abstract: The existence of dark matter (DM) in the universe is strong evidence that new physics beyond the Standa rd Model is needed to explain related phenomenology. While we know little a bout DM properties\, many well-motivated new physics models consider the mi nimal dark sector scenario\, "forgetting" other members in the dark sector. Furthermore\, DM experiments are designed and results are interpreted in t he context of the minimal dark-sector scenario. In this talk\, we argue tha t different search paradigms are needed\, given the current situation that no conclusive evidence has been found through non-gravitational interaction s of DM. As a concrete example\, we discuss models of boosted dark matter ( BDM) arising in non-minimal dark-sector scenarios and their phenomenologica l implications including detection prospects of cosmic-origin BDM signals a t terrestrial experiments and cosmic-ray experiments.

    Notes: Join th e meeting at 4:15 for meet and greet.  \;Visit \;https://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220324T155000Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T163000Z DTEND:20220421T173000Z DTSTAMP:20260828T094430Z UID:376r0g12f38c6slmqt53fusrrh@google.com CREATED:20220412T172938Z DESCRIPTION:Seminar will be conducted via zoom.

    Sp eaker: \;Marc Illa\, IQus/UW

    Title: Using Quantum Annealers t o Simulate Standard Model Physics

    Abstract: While universal quan tum computation is essential in the quest to simulate Standard Model physic s\, the near-term devices that define the NISQ era\, without high-fidelity qubits and error correction\, will be challenged to provide results that ca n be quantitatively compared with experiment. Much of the current research in this area is performed on gate-based quantum computers\, and the alterna tive\, adiabatic quantum computing\, has not been explored with as much det ail. We explore the potential of D-Wave’s quantum annealers for computing b asic components required for quantum simulations of Standard Model physics\ , such as the study harmonic and anharmonic oscillators relevant for lattic e scalar field theories and effective field theories\, the time evolution o f a single plaquette of SU(3) Yang-Mills lattice gauge field theory\, and t he dynamics of flavor entanglement in four neutrino systems.
    LAST-MODIFIED:20220420T200333Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211021T140000 DTEND;TZID=America/New_York:20211021T153000 DTSTAMP:20260828T094430Z UID:7mcnlahfqn2ic1ebheevnj7gs9@google.com RECURRENCE-ID;TZID=America/New_York:20211021T140000 CREATED:20210924T121413Z LAST-MODIFIED:20220617T080651Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: No QMC Seminar\, Thu\, Oct. 21 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220829T200000Z DTEND:20220829T213000Z DTSTAMP:20260828T094430Z UID:4bopi725g82p7sg72iqtcm41ev@google.com CREATED:20220719T134217Z DESCRIPTION:Speaker: Arushi Bodas\, UMD

    Tit le: Stochastic gravitational wave anisotropies: a new window into multi-fie ld inflation

    Abstract:
    Anisotropies of cosmological observables c ontain valuable information about the primordial fluctuations\, famously il lustrated by the CMB. One such observable could be a Stochastic Gravitation al Wave Background (SGWB) from a first-order phase transition in the early universe\, which will necessarily have anisotropies analogous to the CMB. I n multi-field inflationary scenarios\, SGWB anisotropies can have a signifi cant isocurvature component\, which can provide a complementary probe of in flationary physics beyond the standard adiabatic fluctuations of the CMB an d LSS. I will explore the potential of such anisotropies as a probe of ligh t fields from the inflationary era and associated heavier fields through th e mechanism of Primordial Clocks. I will also show that the strength of GW signal can be significantly enhanced if there is a period of early matter d omination.

    Seminar will also be streamed via zoom: \;< /u>    https://umd.zoom.u s/j/562421853 LAST-MODIFIED:20220829T172846Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T193000Z DTEND:20211117T203000Z DTSTAMP:20260828T094430Z UID:12t3647b58i319glksqmau6mm2@google.com CREATED:20211109T175832Z DESCRIPTION:Speaker Name: Alexis Marret

    Speaker Institution : Sorbon ne/Paris Observatory

    Title : The non-resonant streaming instability: from theory to experiments

    Abstract : Cosmic rays can power the exp onential growth of a seed magnetic field by exciting instabilities that fee d on the kinetic energy of the particles collective streaming motion. Of th e different streaming instabilities\, the non-resonant mode has received gr owing attention as it can amplify the magnetic field well beyond its initia l intensity\, and generate the necessary turbulence to help confine and acc elerate cosmic rays in supernovae remnants and young stellar jets shocks. I n general\, it can develop in a large variety of environments\, ranging fro m the cold and dense molecular clouds to the hot and diffuse intergalactic medium.

    This work aims at elucidating the behaviour of the non-reson ant cosmic rays streaming instability in such environments\, where thermal and collisional effects can substantially modify its growth and saturation. To study the instability in hot environments\, where finite Larmor radius effects are important\, we resort to linear kinetic theory and extend the e xisting analytical results to the case of decoupled ions and magnetic pertu rbations. We find that the unstable wavelengths are not entirely suppressed \, but are instead shifted toward larger scales with a strongly reduced gro wth rate.

    The linear theory results are confirmed and extended to th e non-linear evolution by using multi-dimensional hybrid-Particle-In-Cell s imulations (kinetic ions and fluid electrons). The simulations highlight an important reduction of the level of magnetic field amplification in the ho t regime\, indicating that it may be limited in hot astrophysical plasmas s uch as in superbubbles or the intergalactic medium. In colder and denser en vironments\, such as H II regions and molecular clouds\, particle collision s in the background plasma must be taken into account. We investigate numer ically their impact by including Monte-Carlo Coulomb and neutral collisions in the simulations. We find that the instability is rapidly suppressed in poorly ionized plasmas. In contrast\, we find that in fully ionized plasmas \, Coulomb collisions unexpectedly favour the development of the instabilit y by reducing self-generated pressure anisotropies that would otherwise opp ose its growth.

    Numerical simulations are currently the only means t o investigate the non-linear evolution of the instability and to obtain qua ntitative estimates of the saturated magnetic field intensity. The final pa rt of this work is devoted to answer the growing need for an experimental v erification of the linear theory and simulations predictions. We describe s ome of the requirements on the plasma parameters to generate the instabilit y in an experiment\, and propose two preliminary setups based on existing h igh-power laser facilities\, aiming at observing and characterizing the non -resonant mode for the first time in the laboratory.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd .edu LAST-MODIFIED:20211109T175832Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220929T200000Z DTEND:20220929T210000Z DTSTAMP:20260828T094430Z UID:6e0enofu2d0jnd1mej4scsb8kk@google.com CREATED:20220908T192121Z DESCRIPTION:Annual Russell Marker Lecture

    Speaker: Dr. David MacMill an\, Princeton University

    Abstract \; LAST-MODIFIED:20220908T192131Z LOCATION:Chemistry Building\, Room 1407 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T150000Z DTEND:20211103T161500Z DTSTAMP:20260828T094430Z UID:6mptpa57efk3neceuiurkqf5r8@google.com CREATED:20210914T155205Z DESCRIPTION:Speaker: Michael Ritter\, Mullin Group

    Title: Literature Seminar

    Abstract: TBA LAST-MODIFIED:20210914T155205Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220908T193000Z DTEND:20220908T210000Z DTSTAMP:20260828T094430Z UID:1sbgj7ugm54usscp5lu01frdl6@google.com CREATED:20220902T172527Z DESCRIPTION:
    Location: John S Toll Bldg.\, Room 1117
    Speak er: S.J. Gates\, Jr.
    Title: "Introduction to SUSY Representation Theory Using Adinkras"
     \;
    Please download and import the following iCalendar (.ics) files to your ca lendar system.
    Weekly: https://umd.zoom.us/meeting/tJUucuiurzIpH NychTfBrN1yA4OLScbSt3om/ics?icsToken=98tyKuCprT4rHNWcsx-PRowcA4_4 d-7zmFhego1EnxfRBQJBTFLvF7ZtHoF8EuvE

    Join Zoom Meeting
    https://umd.zoom.us/j/ 91351619368 \;
    LAST-MODIFIED:20220907T165959Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics/Math RIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220201T181500Z DTEND:20220201T191500Z DTSTAMP:20260828T094430Z UID:09u3d208mcck7dures4a2toovn@google.com CREATED:20220125T134541Z LAST-MODIFIED:20220125T134541Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T160000Z DTEND:20220301T170000Z DTSTAMP:20260828T094430Z UID:55qstg405e8ueemn6jf9mtjdr4@google.com CREATED:20220207T173737Z DESCRIPTION:Speaker: Dr. Rebecca Dutch\, University of Kentucky< br>
    Title: Anchoring the Spring: The Role of Transmembrane Domain Intera ctions in Viral Fusion Protein Function

    Abstract: \;Enveloped viruses utilize surface glycoproteins to bind and fuse wit h a target cell membrane. The zoonotic Hendra virus (HeV)\, a member of the Paramyxoviridae family\, utilizes the HeV attachment protein (G) and fusio n protein (F) to perform these critical functions. Upon triggering\, the tr imeric F protein undergoes a set of large\, irreversible conformation chang es to drive membrane fusion. We have shown that the transmembrane domain (T M) of the F protein\, separate from the rest of the protein\, is present in a monomer-trimer equilibrium\, and that specific sequences drive this asso ciation. Importantly\, we have demonstrated similar TM-TM interactions in t he TM regions from multiple viral fusion proteins. Our work with Hendra vir us F shown that this TM-TM association contributes to the stability of the pre-fusion form of the protein\, supporting a role for TM-TM interactions i n control of F protein conformational changes. To determine the impact of d isrupting TM-TM interactions\, constructs expressing the HeV F TM with limi ted flanking sequences were synthesized. Co-expression of these constructs with HeV F resulted in dramatically reductions in the stability of F protei n expression and ablation of fusion activity. In contrast\, no effects were observed when the HeV F TM constructs were co-expressed with the non-homol ogous parainfluenza virus 5 (PIV5) fusion protein\, indicating a requiremen t for specific interactions. To further examine this\, a TM peptide homolog ous to the PIV5 F TM domain was synthesized. Addition of the peptide prior to infection inhibited viral infection with PIV5\, but did not significantl y affect infection of human metapneumovirus\, a related virus. These findin gs indicate that TM-TM interactions are a critical stabilizer for the pre-f usion form of viral fusion proteins\, and suggest that disruption of these interactions inactivates F protein function\, likely by prematurely trigger ing F protein conformational changes. LAST-MODIFIED:20220224T153238Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry and Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T150000Z DTEND:20220428T160000Z DTSTAMP:20260828T094430Z UID:72li73qd8e8f1p6fp3s46ejcnr@google.com CREATED:20220207T182344Z DESCRIPTION:Literature Seminar


    Speaker: Rita Dill

    Title: Micr oencapsulation of Fragrance Molecules in Perfumes and Detergents

    Abs tract: \;https://chem.umd.edu/events/literature-seminar-rita-dill LAST-MODIFIED:20220426T142737Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211014T150000Z DTEND:20211014T163000Z DTSTAMP:20260828T094430Z UID:1jp3rd1hosk85qi3qp4e559t6t@google.com CREATED:20210830T185733Z DESCRIPTION:Speaker: Niklas Mueller\, UMD\n\nTitle: Thermalization of Gauge Theories from their Entanglement Spectrum\n\n\nAbstract: Using dual theori es embedded into a larger unphysical Hilbert space along entanglement cuts\ , we study the Entanglement Structure of Z2Z lattice gauge theory in (2+1)( 2+1) spacetime dimensions. We find that Li and Haldane's conjecture holds f or gauge theories\, and show consistency of the Entanglement Hamiltonian wi th the Bisognano-Wichmann theorem. Studying non-equilibrium dynamics after a quench\, we provide a complete description of thermalization in Z2Z gauge theory which proceeds in a characteristic sequence: Maximization of the Sc hmidt rank and spreading of level repulsion at early times\, self-similar e volution with scaling coefficients α=0.8±0.1α=0.8±0.1 and β=0.05±0.03β=0.05 ±0.03 at intermediate times\, and finally thermal saturation of the von Neu mann entropy. LAST-MODIFIED:20211007T131840Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211101T190000Z DTEND:20211101T203000Z DTSTAMP:20260828T094430Z UID:00rrqfjjnesd757tn32jnjd2a0@google.com CREATED:20210913T140450Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Haipeng An\ , Tsinghua University

    Title: Gravitational waves from first-order ph ase transition during inflation

    Abstract: During the inflation era\, the properties (such as mass and interactions) of the fields coupled to th e inflaton field may change substantially. As a result\, drastic phenomena\ , such as first order phase transitions\, may happen. In this talk\, I will present simple models that first-order phase transition can happen and fin ish during inflation. I will discuss the properties of the gravitational wa ve (GW) signals produced by first-order phase transitions during inflation. I will show that there is a unique oscillatory feature in the GW spectrum. I will also show that we may be able to observe directly such a signal thr ough future terrestrial or spatial GW detectors.

    For zoom link pleas e email mknouse@umd.edu LAST-MODIFIED:20211029T135303Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220802T150000Z DTEND:20220802T163000Z DTSTAMP:20260828T094430Z UID:312nmtr2ouf7i6a28rcnvcqb3k@google.com CREATED:20220726T181151Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Bosonic stabilizer codes\nSpeaker: Victor Albert (QuICS)\nTime: Tuesday\, August 2\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zo om.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123\n\nLecture 2: Bosonic stabilizer codes\n\nI go over bosonic quantum memories\, organizing them into bosonic stabilizer cod es and bosonic Fock-state codes. \n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/ 9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile\n+16699006833\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\n\nDial by your location\ n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8 782 US (Tacoma)\n+1 301 715 8592 US (Washington DC)\n+1 312 626 6799 US (Ch icago)\n+1 346 248 7799 US (Houston)\n+1 386 347 5053 US\n+1 564 217 2000 U S\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind y our local number: https://umd.zoom.us/u/ab F3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US We st)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 ( India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 ( Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melb ourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver) \n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181151Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc1 23 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211111T160000Z DTEND:20211111T173000Z DTSTAMP:20260828T094430Z UID:2uqgoalqtg3tpc970daatsjf6q@google.com CREATED:20210901T143150Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Kostas Orgino s\, William &\; Mary

    Title: Non-pertrubative studies of parton di stribution functions


    Abstract: Parton distribution functions (PD Fs) encode the non-perturbative structure of hadrons and their knowledge is essential for our ability to predict experimentally measured cross section s. They play an important role in discovering new physics at high energy co llider experiments as well as in our understanding of the internal structur e of hadrons. However\, up until recently\, PDFs could only be determined f rom experimental data while first principles theoretical computations were limited to a few of their Melin moments. Novel ideas that came along have o pened new avenues for ab initio parton distribution function computations. In this talk\, I am presenting some of the lattice QCD methods employed in PDF studies and review recent numerical results from the W&\;M/JLab coll arbration (HadStruc). \; LAST-MODIFIED:20211105T131604Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210917T170000Z DTEND:20210917T180000Z DTSTAMP:20260828T094430Z UID:4vo7k949m1i6mgkgqmroauqtmu@google.com CREATED:20210909T124558Z DESCRIPTION:Speaker: Elizabeth C. Dickey\, Professor &\; Unit Head\, Mat erials Science &\; Engineering\, Carnegie Mellon University

    Title : Point Defect Engineering in Metal Oxides

    Abstract: \;https://mse .umd.edu/event/16601/ LAST-MODIFIED:20210909T124558Z LOCATION:Room 2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211029T170000Z DTEND:20211029T180000Z DTSTAMP:20260828T094430Z UID:5hupc0479muq7atrat72sa5dl0@google.com CREATED:20210914T150711Z DESCRIPTION:Speaker: Raymundo Arroyave\, Professor\, Materials Science & En gineering\, Texas A&M University\n\nTitle: Bayesian Materials Discovery Fra meworks\n\nAbstract: Over the last decade\, there has been a paradigm shift away from labor-intensive and time-consuming materials discovery methods\, and materials exploration through informatics approaches is gaining tracti on at present. Current approaches are typically centered around the idea of achieving this exploration through high-throughput (HT) experimentation/co mputation. Such approaches\, however\, do not account for the practicalitie s of resource constraints\, which eventually result in bottlenecks at vario us stages of the materials discovery/design workflow. Regardless of how man y bottlenecks are eliminated\, the fact that ultimately a human must make d ecisions about what to do with the acquired information implies that HT fra meworks face hard limits that will be extremely difficult to overcome. Rece ntly\, this problem has been addressed by framing the materials discovery p rocess as an optimal experiment design problem. In this talk\, I will discu ss the need for optimal experiment design\, the challenges in its implement ation and finally discuss some successful examples of materials discovery v ia experiment design. Specifically\, I will discuss some recent examples in which my group and collaborators have demonstrated: (i) Multi-objective ma terials discovery and design\; (ii) Bayesian optimization under model uncer tainty (BOMU)\; (iii) Multi-source information fusion Bayesian optimization for materials design\; (iv) Batch Bayesian optimization applied to microst ructure sensitive design of materials. LAST-MODIFIED:20210914T150711Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220906T160000 DTEND;TZID=America/New_York:20220906T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20220906T160000 CREATED:20210423T130624Z DESCRIPTION:
    Zohreh Davoudi\, University of Maryland

    The qu antum world of quarks and gluons on a quantum simulator?

    The strong force in nature\, described by the quantum and relativistic framewo rk of quantum chromodynamics or QCD\, has long generated an active and grow ing field of research and discovery. In fact\, despite its development over many decades ago\, it still leaves us with plenty of exciting questions to explore in the 21st century\, with a multi-billion-dollar experimental inv estment that aims to understand the core of matter: Can we learn the phase diagram of matter governed by strong interactions? Can we predict how matte r evolves and thermalizes after energetic processes such as in the early un iverse or in terrestrial particle colliders? How do elementary particles in QCD\, quarks and gluons\, and their interactions give rise to the complex structure of a proton or a nucleus? While an extremely successful theoretic al and computational program called lattice QCD has enabled a first-princip les look into some properties of matter\, we have yet to come up with a com putationally more capable tool to predict the complex dynamics of matter fr om the underlying interactions. Can a large reliable (digital or analog) qu antum simulator eventually enable us to study the strong force? What does a quantum simulator have to offer to simulate QCD and how far away are we fr om such a dream? In this talk\, I will describe a vision for how we may go on a journey toward quantum simulating QCD\, by taking insights from early to late developments of lattice QCD\, by motivating the need for novel theo retical\, algorithmic\, and hardware approaches to quantum-simulating this unique problem\, and by providing examples of the early steps taken to date in establishing a quantum-computational lattice-QCD program.

    LAST-MODIFIED:20220901T141819Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210922T150000Z DTEND:20210922T161500Z DTSTAMP:20260828T094430Z UID:0naf6b4i2riud1e9un2a6trut4@google.com CREATED:20210914T131821Z DESCRIPTION:Speaker: Aaron Rury\, Wayne State - \;https://clasprofiles.wayne.edu/profile/g k7795

    Title: Assessing Hybrid Molecular Platforms for Next Gener ation Quantum Technologies

    Abstract: \;Quantum control over ligh t and matter is poised to enable future capabilities beyond the reach of cu rrent technologies in chemical synthesis\, energy harvesting\, and informat ion processing and storage. Despite this promise\, the fundamental physical drivers of quantum control in proposed platforms remain unclear. In this t alk\, I will present results from fundamental studies of structure-property relationships in two disparate hybrid molecular systems of emerging intere st to the chemistry community. First\, I will present results from our stud ies on the chemistry and properties of mid-gap states formed in self-assemb led quantum nanostructures. These results indicate synthetic routes to the deterministic design of structural defects for the emission of narrowband l ight spectra central to solution-processed single photon sources and entang led photon generation in the established telecommunications band. Second\, I will present results in the design\, fabrication\, and characterization o f cavity polariton samples containing single and multiple chromophores. The se results suggest the entanglement of light and matter states mediated by polariton formation opens new avenues to control ultrafast molecular photop hysics and intermolecular interactions on truly quantum footing. These stud ies demonstrate the wealth of fundamental physical information \;centra l to the development of next generation molecular quantum technologies  \;that can be attained from informed materials design and advanced spectros copic characterization.

    Where: \;http://go.umd.edu/pchem_seminars

     LAST-MODIFIED:20210916T191603Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211026T170000Z DTEND:20211026T180000Z DTSTAMP:20260828T094430Z UID:146cft1j1b2p09dfte62subirf@google.com CREATED:20210913T182234Z DESCRIPTION:Speaker: Professor Jan Sengers\, UMD

    Title: Mass and Thermodiffusion in Multicomponent Fluid Mixtures

    Abstr act: Mass diffusion and thermo-diffusion coefficients of multicomponent fluid mixtures depend on the representation used to specify the compositio n\, i.e.\, whether mass fractions\, mole fractions\, or volume fractions ar e used. Different authors have used different approaches which makes compar ison between experimental diffusion coefficients of multicomponent fluids d ifficult. This presentation will show how one can redefine mass and thermo- diffusion coefficients of multicomponent fluid mixtures so that they become independent of the frame of reference.

    This contribution to non-equ ilibrium thermodynamics is in memory of José María Ortiz de Zárate Leira. 1 \,2 1. J.M. Ortiz de Zárate\, Eur. Phys. J. E 42: 43 (2019).
    2. J.M. Ort iz de Zárate and J.V. Sengers\, Phys. Chem. Chem. Phys. 22\, 175976 (2020).


    LAST-MODIFIED:20211020T142318Z LOCATION:IPST Bldg. #085 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T190000Z DTEND:20211104T200000Z DTSTAMP:20260828T094430Z UID:377dc4tco6gi1goc8v9u1up4uq@google.com CREATED:20211025T175224Z DESCRIPTION:Title : "A Ghost Hunt: Search for Dark Matter via Ground-based Experiments"

    Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : National Central University (Taiwan)

    Abstract : I will present tw o complementary thrusts towards a search for dark matter. I shall start wit h a search via the mono-h(bb) channel using the 2016 data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The mono-h(bb) signal is characterized by a Higgs boson\, decaying to a bot tom quark-antiquark pair\, recoiling against large missing transverse momen tum.
    Novel analysis techniques are exploited and the results are interpr eted in terms of limits on parameters of various mono-h models. I will then introduce a newly established experiment -- the Taiwan Axion Search Experi ment with Haloscope (TASEH)\, aiming to look for axions with a mass of abou t 20 μeV\; I will show the current status of TASEH and present its outlook.


    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211029T131548Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210510T110000 DTEND;TZID=America/New_York:20210510T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210510T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Internally engineered Majorana modes in twisted bilayer graphene

    Speaker: Jason Alicea\, California Institute \;of Technology

    Abstract: Twisted bilayer graphene (TBG) realizes an exquisitely tunable\, strongly i nteracting system featuring superconductivity and various correlated insula ting states. \; In this talk I will introduce gate-defined wires in TBG as an enticing platform for Majorana-based fault-tolerant qubits. \; O ur proposal notably relies on “internally” generated superconductivity in T BG – as opposed to “external” superconducting proximity effects commonly em ployed in Majorana devices – and may operate even at zero magnetic field. & nbsp\;I will also describe how electrical measurements of gate-defined wire s can reveal the nature of correlated insulators and shed light on the Coop er-pairing mechanism in TBG. \;


    We are hosting the Spring 2021 J QI Seminars virtually as Zoom meetings. JQI members and affiliates will rec eive a Zoom link in an email announcing each seminar. For those without acc ess to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube p age at \;https://www.you tube.com/user/JQInews. LAST-MODIFIED:20210501T011756Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T213000Z DTEND:20220207T223000Z DTSTAMP:20260828T094430Z UID:62056b3lij02jivcvcfs9tsa1d@google.com CREATED:20220107T210514Z DESCRIPTION:Title: Cosmic Explosions and Cosmic Accelerators

    Speaker : Regina Caputo\, NASA Goddard Space Flight Center

    Abstract: The sum mer of 2017 ushered in the era of multimessenger astrophysics and the Fermi Gamma-ray Space Telescope has be en at the forefront. We can now observe the universe not only with light an d cosmic rays\, but also with gravitational waves and neutrinos. When two s tars made of the densest material in the universe smashed together\, Fermi observed a burst of gamma rays. At the same time\, the gravitational wave f rom this explosion was observed with the Las er Interferometer Gravitational-wave Observatory (LIGO)\, setting off a campaign by nearly every telescope in the world to observe the result of t he cataclysm. Within a month of this discovery\, Fermi also observed a dist ant galaxy accelerating particles to extreme energies resulting in more gam ma rays than it had ever produced before. During this time\, the IceCube South Pole N eutrino Observatory detected a high energy neutrino telling us about th e fundamental components of the accelerated cosmic rays. Observing multiple messengers from the same source revolutionized our understanding of the ex treme universe. The next decade will be one of multimessenger discovery.

    Notes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20220107T211016Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220908T180000Z DTEND:20220908T193000Z DTSTAMP:20260828T094430Z UID:7hk2d59t7dacc1c5j9tfq6nrgr@google.com CREATED:20220902T174255Z DESCRIPTION:Speaker: Connor Powers\, UMD

    Title: Toward Qu antum Computing Phase Diagrams of Gauge Theories with Thermal Pure Quantum States\," and here is the abstract:

    Abstract: The phase diagram of s trong interactions in nature at finite temperature and chemical potential r emains largely unexplored theoretically due to inadequacy of Monte-Carlo-ba sed computational techniques in overcoming a sign problem. Quantum computin g offers a sign-problem-free approach but evaluating thermal expectation va lues is generally resource intensive on quantum computers. To facilitate th ermodynamic studies of gauge theories\, we propose a generalization of ther mal-pure- quantum-state formulation of statistical mechanics applied to con strained gauge-theory dynamics\, and numerically demonstrate that the phase diagram of a simple low-dimensional gauge theory is robustly determined us ing this approach\, including mapping a chiral phase transition in the mode l at finite temperature and chemical potential. Quantum algorithms\, resour ce requirements\, and algorithmic and hardware error analysis are further d iscussed to motivate future implementations. Thermal pure quantum states\, therefore\, may present a suitable candidate for efficient thermal-state pr eparation in gauge theories in the era of quantum computing.     LAST-MODIFIED:20220902T181726Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210224T160000Z DTEND:20210224T170000Z DTSTAMP:20260828T094430Z UID:470b7mmbat9cpqbnfrtbcpaiv9@google.com CREATED:20210219T224755Z DESCRIPTION:Speaker: Yunxiang Liao
    Title: \;Emergence of many-body quantum chaos via spontaneous breaking of unitarity
    Abst ract: \;Despite numerous efforts\, there lacks a microscopic unders tanding of the emergence of irreversible statistics mechanics behavior in i solated many-body quantum systems evolving under the reversible unitary dyn amics. The fundamental question of thermalization is intertwined with many- body quantum chaos\, and in particular its connection with random matrix th eory. It has been found that many-body level statistics of noninteracting f ermions populating single-particle levels of a Gaussian unitary ensemble ex hibits rich structure\, which stems from single-particle quantum chaos and is reflected by the exponential ramp in the spectral form factor (SFF). We generalize this study to interacting theory and evaluate the SFF for both c ases of zero and positive infinitesimal inverse temperature \\beta using th e field integral formulation. The SFF for \\beta=0 in the regime of interes t is dominated by contribution from the fluctuations around the “standard” saddle point. The associated soft modes responsible for the exponential ram p of the noninteracting theory acquire a mass in the presence of interactio ns\, resulting in the suppression of the exponential ramp -- a necessary pr erequisite for the emergence of random matrix structure in many-body spectr um. By contrast\, the SFF for positive infinitesimal \\beta is instead gove rned by fluctuations around a series of “nonstandard” saddle points in addi tion to the “standard” one. Furthermore\, for a particular “nonstandard” sa ddle point\, the presence of interactions does not lead to a mass suppressi ng the exponential ramp. This work suggests that the emergence of many-body quantum chaos might appear as spontaneous symmetry breaking of unitarity a nd consequently time-reversal invariance.


    Email rcawthor@umd.edu for Zoom details LAST-MODIFIED:20210221T203405Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220919T150000Z DTEND:20220919T160000Z DTSTAMP:20260828T094430Z UID:2lu2j9ktjr2l2hpdp0opg3litm@google.com CREATED:20220804T163038Z DESCRIPTION:Speaker: Nicole Yunger Halpern (QUICS/JQI)


    Title: \;A Tale of Two Disciplines: Non-Abelian Eigenstate Thermalization Hypothesis

    Abstra ct: \;Why do chaotic quantum many-body systems thermalize internally? T he eigenstate thermalization hypothesis (ETH) explains why if the Hamiltoni an lacks degeneracies. If the Hamiltonian conserves one quantity ("charge") \, the ETH implies thermalization within an eigenspace of the charge—in a m icrocanonical subspace. However\, quantum systems can have charges that fai l to commute with each other and so share no eigenbasis\; microcanonical su bspaces may not exist. Worse\, the Hamiltonian will have degeneracies\, so the ETH need not imply thermalization. We adapt the ETH to noncommuting cha rges by positing a non-Abelian ETH and invoking the approximate microcanoni cal subspace introduced in quantum thermodynamics. We apply the non-Abelian ETH in calculating local observables' time-averaged expectation values. In many cases\, we prove\, the time average thermalizes. However\, we find an omalous corrections to thermal predictions under a physically reasonable as sumption. This work bridges noncommuting charges\, recently on the rise in quantum thermodynamics\, to the ETH\, a cornerstone of many-body physics.

    References
    -Murthy\, Babakhani\, Iniguez\, Srednicki\, and NYH\, arXiv: 2206.05310 (2022).
    -NYH and Majidy\, npj Quantum Information 8\, 10 (202 2).
    -Kranzl\, Lasek\, Joshi\, Kalev\, Blatt\, Roos\, and NYH\, arXiv:220 2.04652 (2022).

     LAST-MODIFIED:20220804T163118Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Nicole Yunger Halpern TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T150000Z DTEND:20211103T161500Z DTSTAMP:20260828T094430Z UID:59cht3ol9chdvtpss4j5tdt4ju@google.com CREATED:20211028T160419Z DESCRIPTION:Title: Turbocharging quantum computing through active and pass ive error suppression\nSpeaker: Joseph Emerson (University of Waterloo)\nT ime: Wednesday\, November 3\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/99857134424\n\nIn this talk I will give an overview of various strategies we have developed for suppressing the inevitable erro rs occurring during quantum computations. These tools work at the gate leve l and thus can be effective even through a cloud API exposing only elementa ry gates to the end-user. I will demonstrate the effectiveness of these too ls with experimental results across multiple hardware architectures. LAST-MODIFIED:20211028T160419Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/99857134424 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Joseph Emerson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T160000Z DTEND:20220222T170000Z DTSTAMP:20260828T094430Z UID:4oaktde3nug1ob4jleu16lbgjl@google.com CREATED:20220209T190153Z DESCRIPTION:Title: A field theoretical approach to quantum circuits\nSpeak er: Yunxiang Liao (University of Maryland)\nTime: Tuesday\, February 22\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoo m.us/j/91966330464?pwd=STZkS3lCbFFvcjZDeHNXV3BZb05ydz09\n\nQuantum circuits have been widely used as a platform to explore universal properties of gen eric quantum many-body systems. In this talk\, I will present our work in w hich we construct a field theoretical approach to study quantum circuits. W e reformulate the sigma model for time periodic Floquet systems using the r eplica method\, and apply it to the study of spectral statistics of the evo lution operator of quantum circuits. This approach is applicable to a wide class of Floquet circuits\, and allows us to look into the mechanism behind the emergence of universal random matrix behaviors in quantum chaotic syst ems. In the same replica sigma model framework\, we also rederive the Weing arten calculus\, which is a method to evaluate integrals of polynomials wit h respect to Haar measure over compact groups and has wide applications in the studies of quantum circuits.\n LAST-MODIFIED:20220209T190153Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91966330464? pwd=STZkS3lCbFFvcjZDeHNXV3BZb05ydz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Yunxiang Liao TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220309T170000Z DTEND:20220309T180000Z DTSTAMP:20260828T094430Z UID:48nott5s4bv2uq1dm1oic93ni3@google.com CREATED:20220207T164917Z DESCRIPTION:Speaker: Calvin M. Stewart\, Associate Professor\, Aerospace an d Mechanical Engineering University of Texas El Paso

    Title: Material s at Extremes Research

    Abstract: Materials are being asked to perfor m at “extremes” with increased inlet pressures and temperatures in industri al and aero gas turbines\, the rise of hypersonic flight\, and new Generati on IV fission and ITER Fusion reactor concepts. There is a need to develop advanced manufacturing techniques to fabricate extreme environment material s\, components\, and geometries not possible with conventional techniques. To meet this challenge\, government\, academia\, and industry has invested heavily in Additive Manufacturing (AM) technologies and Integrated Computat ional Materials Engineering (ICME) to achieve “designer” components with pr ocessing\, structure\, properties\, and performance designed to survive har sh environments. The quest for new materials requires that we quickly manuf acture\, qualify\, and model the performance of the candidate materials for service.


    The Materials at Extremes Research Group (MERG) has focused on the development of advanced manufacturing\, testing and characterizatio n\, theoretical models\, and computational tools for various extreme enviro nment applications. In this seminar\, we will review the ongoing and future research projects at MERG\, and conduct a deep dive into accelerated\, par allelized\, and miniaturized testing methods for new materials qualificatio n and a probabilistic modeling framework for reliability-based design for e xtreme environments.

    Bio:

    Calvin M. Stewart is an associate pr ofessor in the Department of Mechanical Engineering at UTEP with a joint ap pointment in the Center for Space Exploration Technology Research (cSETR)\, a NASA University Research Center. He obtained a BS\, MS\, and PhD in Mech anical Engineering at the University of Central Florida in 2008\, 2009\, an d 2013 respectively. Dr. Stewart directs the Materials at Extremes Research Group (MERG) which focuses on the mechanical testing\, constitutive modeli ng\, and finite element analysis of materials subject to thermal\, mechanic al\, and chemical extremes. Within the gamut of extremes\; creep\, fatigue\ , thermomechanical fatigue\, corrosion\, oxidation\, impact\, and fracture are key focus areas. Dr. Stewart has authored over 40 articles in these are as. Current research involves the development of an accelerated creep test protocol for modern and advanced superalloys\, development of meta-constitu tive model capable of self-identifying the optimal functional form for a gi ven material and boundary conditions\, the development of unified viscoplas ticity constitutive models for elevated temperature applications\, and the fundamental thermomechanical characterization of electron beam melted (EBM) superalloys. Materials of interest include: cast and additively manufactur ed (AM) superalloys\, AM polymers\, biomaterials\, energetic materials\, tr ansportation materials\, and others. Computational interests include: stoch astic modeling and meta-heuristic optimization algorithms for material cons tant determination\, symbolic regression\, and shape optimization.

    LAST-MODIFIED:20220228T151827Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220907T170000Z DTEND:20220907T180000Z DTSTAMP:20260828T094430Z UID:6pke7eq5qj0vrqkdqjm05joldt@google.com CREATED:20220904T005240Z DESCRIPTION:Title:  A Brief Introduction to Post-Quantum Cryptography
    Sp eaker:  Yusuf Alnawakhtha (QuICS)
    Time:  Wednesday\, September 7\, 2022 - 1:00pm
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

    In this talk I w ill be giving a brief introduction to some post-quantum cryptography concep ts that appear frequently when discussing quantum cryptographic protocols w ith classical communication. The objective of this talk is to give intuitio n on how some of the protocols that will be described in this seminar serie s derive their security. To that end\, I will be explaining the Learning wi th Errors problem (LWE) and how it relates to the conjectured hardness of l attice problems. I will then define Trapdoor Claw-Free functions and discus s their relevance to this research area and how we can construct them from LWE.

    This is the first talk of the Quantum Cryptography with Classic al Communication Seminar. LAST-MODIFIED:20220904T005240Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Yusuf Alnawakhtha TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T180000Z DTEND:20220407T193000Z DTSTAMP:20260828T094430Z UID:6mde3dlhj6tcer64bc62c0d8rc@google.com CREATED:20220330T202513Z DESCRIPTION:

    Title: The low temperature \;thermal Hall conductivit y in the Kitaev magnet a-RuCl3

    Abstract: The layered honeycomb Ki taev magnet a-RuCl3 is of strong topical interest. The AF state which appea rs below 7 K is suppressed when \;B \;(applied along the zig zag axis \;a) exceeds 7 T.

    The resulting phase is widely r egarded as a quantum spin liquid (QSL). The thermal conductivity tensor Kij \;provides an incisive probe of the transport properties of the spin excitations.

    I will discuss high-resolution measurements of both Kxx \;and Kxy \;at temperatures 0.4 K t o 10 K with focus on the controversy whether the planar thermal Hall conduc tivity Kxy \;is half quantized. Our measurements (Ref. 1) su pport a thermal Hall signal that arises from bosonic edge modes carrying sp in excitations in a finite Berry curvature \\Omega. This picture is orthogo nal to the Majorana fermion picture advocated by the Kyoto group. I will al so describe quantum oscillations observed in Kxx \;inthe QSL state below 4 K. \;

    1. Peter Czajka et al.\, Nature Phys. 2021 \, and preprint.

    Host: Richard Greene


    Time: 2pm - 3 :30pm

    Seminar on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220330T202821Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM : Nai Phuan Ong\, Princeton University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T173000Z DTEND:20211013T183000Z DTSTAMP:20260828T094430Z UID:14qdonjqsh8k5cpe1m9e6r9ndt@google.com CREATED:20210823T132507Z DESCRIPTION:Speaker: Felix Kling\, \;DESY

    Preceded by 12:30pm vi rtual lunch.

    Title: Looking forward to new physics at the LHC

    Abstract: Physics searches and measurements at high-energy collider experi ments traditionally focus on the high-pT region. However\, if particles are light and weakly-coupled\, this focus may be completely misguided: light p articles are typically highly collimated around the beam line\, allowing se nsitive searches with small detectors\, and even extremely weakly-coupled p articles may be produced in large numbers there. In the upcoming run of the LHC\, the FASER experiment will use the opportunity and extend the LHC's p hysic potential by searching for long-lived particles and studying neutrino interactions at TeV energies. A continuation of this forward physics progr am for the HL-LHC era\, in the form of a 'forward physics facility' with la rger scale experiments\, is currently under discussion. In this talk\, I wi ll present the physics potential of these experiments for new physics searc hes\, neutrino physics\, QCD and astro-article physics aiming to stimulate a fruitful discussion with my audience.

    For zoom link please email < a href="mailto:mknouse@umd.edu">mknouse@umd.edu LAST-MODIFIED:20211006T133904Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint JHU/ UMD Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220419T171500Z DTEND:20220419T181500Z DTSTAMP:20260828T094430Z UID:3b3u2vt5kmom00k2vpq481mps9@google.com CREATED:20220207T155451Z DESCRIPTION:Speaker: Professor Jindal Shah\, Oklahoma Sta te University

    Title: What Does Non-Ideality Mean for Binary Ionic Li quid Mixtures?

    Abstract: \;Ionic liquids aresubsta nces that are composed entirely of ions. Negligible vapor pressures andthe availability of a large number of cations and anions to tunephysicochemical and biological properties for a given chemical process havebeen the primar y drivers for research in this field over the last two and half  \;deca des. A major thrust of theseinvestigations is on elucidating changes in the properties of pure ionicliquids by altering the cation\, anion or substitu ents on the ions. Anotherapproach to expand the range of available ionic li quids is to form ionicliquid-ionic liquid mixtures. From a thermodynamic po int of view\, the knowledgeof the extent of non-ideality in these binary io nic liquid mixtures and themolecular level details enable a prioripr ediction of thermophysical properties of ionic liquid mixture. In thisprese ntation\, we will demonstrate that the difference in the molar volume ofthe ionic liquids forming the mixture and the difference in the hydrogenbondin g ability of the anions can serve as metrics for the prediction ofnon-ideal ity in the binary ionic liquid systems. Such non-idealities appear inthe fo rm local structural organization of anions around the cation in ionicliquid mixtures bearing a common cation and two different anions. We willfurther highlight that these non-native structures lead to a different dissolutionm echanism for CO2 in mixtures in comparison to that for pure ioni cliquids although the CO2 solubilities obey apparent ideal mixin grule.


     LAST-MODIFIED:20220414T210306Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T160000Z DTEND:20220202T170000Z DTSTAMP:20260828T094430Z UID:1ca4gt83lcght6aomof6b1nq82@google.com CREATED:20220112T013442Z DESCRIPTION:Title: Fault Tolerance and Holography\nSpeaker: Ning Bao (Bro okhaven National Laboratory)\nTime: Wednesday\, February 2\, 2022 - 11:00a m\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099 146 Meeting ID: 411 109 9146\n\nIn this talk I will study the extension of fault tolerance techniques to holographic quantum error correcting codes in the context of the ads/cft correspondence. I will seek to argue that the t hreshold here corresponds to that of the confinement/de confinement phase t ransition here\, analogously to the situation in topological quantum error correcting codes based on Tqft’s.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us /j/4111099146\nMeeting ID: 411 109 9146\nOne tap mobile\n+13017158592\,\,41 11099146# US (Washington DC)\n+13126266799\,\,4111099146# US (Chicago)\nDia l by your location\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n + 1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n + 1 669 900 6833 US (San Jose)\nMeeting ID: 411 109 9146\nFind your local num ber: https://umd.zoom.us/u/abk5ky5DyW\nJoin by SIP\n4111099146@zoomcrc.com\ nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.1 31.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amste rdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Syd ney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64. 211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toront o)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.13 7.24.110 (Japan Osaka)\nMeeting ID: 411 109 9146 LAST-MODIFIED:20220112T013442Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146 M eeting ID: 411 109 9146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Ning Bao TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T180000Z DTEND:20220428T193000Z DTSTAMP:20260828T094430Z UID:31sta6pspaa6kn43rpaqqbnajq@google.com CREATED:20220419T172130Z DESCRIPTION:

    Title: How material and design of super conducting qubits affect quasiparticles

    Cihan Kurter\, IBM Quantu m\, T. J. Watson Research Center\, Yorktown Heights NY\, United States.

    Abstract: \;Elementary excitations of the superconducting con densate known as quasiparticles are major sources of dissipation in superco nducting qubits. When a quasiparticle tunnels across the Josephson junction (JJ) of a qubit circuit\, there is a possibility of exchanging energy with the qubit\, leading to a total decoherence. In this talk\, I will mainly f ocus on the impact of intrinsic habitat of two-dimensional\, fixed frequenc y transmon qubits such as shunting capacitor material or design on the quas iparticle dynamics. I will also present our recent results on temperature d ependence of quasiparticle tunneling rate to discuss how quasiparticles res pond to high transmission sites/defects within the oxide barriers of the JJ s. Our results demonstrate a unique in situ characterization tool to assess the uniformity of tunnel barriers in qubit junctions and shed light on how quasiparticles can interact with various elements of the qubit circuit.


    Host: Palmer \;

    1

    Seminar on Zoom
    Meeting&n bsp\;Link: \; \;http s://umd.zoom.us/j/91301075848     LAST-MODIFIED:20220424T163408Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Cihan Kurter\, IBM Quantum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220914T150000Z DTEND:20220914T160000Z DTSTAMP:20260828T094430Z UID:6t3g6so42u49i3cdfetqpvkcqh@google.com CREATED:20220804T153855Z DESCRIPTION:Speaker: Dr. John Straub\, Boston University

    Title: Theoretical Perspectives on Amyloid Protein Aggregation and Fibril F ormation

    Abstract: \;Considerable progress has been made\, using experiments and computations\, to decipher the general princip les governing the mechanism of formation of oligomers and fibrils of amyloi d proteins implicated in diseases. Changes in sequence and environment (inc luding pH\, salt\, co-solvents\, and membrane) are observed to influence th e aggregation process and the specific form of the ultimate fibril state. I will share the results of recent computational studies exploring the role of sequence\, charge\, and cholesterol on the early and late stages of the aggregation pathway of amyloid-β (Aβ) protein\, associated with Alzheimer’s disease. \; \; LAST-MODIFIED:20220906T134103Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220322T171500Z DTEND:20220322T181500Z DTSTAMP:20260828T094430Z UID:7g95ku7o0jul92o72t8sjpsppu@google.com CREATED:20220207T154857Z LAST-MODIFIED:20220207T154857Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - SPRING BREAK - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210506T200000Z DTEND:20210506T210000Z DTSTAMP:20260828T094430Z UID:78u4cbcgpkvejvhop0l782bk8l@google.com CREATED:20210115T215132Z DESCRIPTION:Speaker: Yang Bai\, University of Wisconsin

    Title: Magne tic Black Holes with Electroweak-Symmetric Coronas

    Abstract: Magneti cally charged black holes are interesting solutions of the Standard Model a nd general relativity. They may possess a "hairy" electroweak-symmetric co rona outside the event horizon\, which speeds up their Hawking radiation an d leads them to become nearly extremal on short timescales. In this talk\, I will discuss their properties and various approaches to search for them i n our current universe.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210429T130511Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special UMD/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T203000Z DTEND:20211110T213000Z DTSTAMP:20260828T094430Z UID:6d1jo3uj9jedqcmaolmjp33vk8@google.com CREATED:20211105T133127Z DESCRIPTION:Speaker Name: Prof. David A. Bader

    Speaker Institution : New Jersey Institute of Technology

    Title : The International Race t o Exascale Supercomputing

    Abstract : Supercomputing has become an es sential tool for computational science and engineering and such real-world problems as weather prediction\, jet design\, molecular dynamics\, and medi cal imaging. Such systems also provide unique capabilities for nation-scale intelligence and surveillance. The first terascale and petascale supercomp uters were built by Intel and IBM\, respectively\, at US Department of Ener gy Labs. Today's fastest supercomputer\, Fugaku\, is located at Japan's RIK EN Center for Computational Science. Several nations now are in a race to b uild the world's first exascale supercomputer that will perform an astoundi ng 10^18 floating point operations per second. Will the United States maint ain its high-performance computing leadership\, or are we slipping in our n ational strategy and investments? Where are our competitors such as China\, Russia\, Iran\, and Europe in their plans to launch an exascale supercompu ter. Will China beat the United States and dominate the field of HPC? In th is talk\, Bader will give an overview of the international race to exascale supercomputing by the leading countries and regions\, and provide some ins ights into competing strategies.


    Notes: Join from the meeting li nk

    https://lpscp.webex.com/lpscp/j.php?MTID=mbd6 41a88554d302b60572c92f9abbd29

    Join by meeting number

    Meeting number (access code): 2630 537 3638

    Meeting password: BVkDc VYz272

    Tap to join from a mobile device (attendees only)
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    Join by phone
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    Join from a vi deo system or application
    Dial \;26305373638@lpscp.webex.com
    You can also dial 173.243.2.68 and enter your meeting number.

    Host Name: Kim Pinckney-Lewis
    Hos t E-Mail: \;kimpl@lps.umd.edu LAST-MODIFIED:20211105T133127Z LOCATION:Virtual Meeting: https://lpscp.webex.com/lpscp/j.php?MTID=mbd641a 88554d302b60572c92f9abbd29 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210126T181500Z DTEND:20210126T191500Z DTSTAMP:20260828T094430Z UID:7e82ftmdh9pm1agut7e4edl6tm@google.com CREATED:20210120T153428Z LAST-MODIFIED:20210120T153512Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210208T210000Z DTEND:20210208T220000Z DTSTAMP:20260828T094430Z UID:6p7hrs2rgp8qli7s9ocnhcs26f@google.com CREATED:20210111T170257Z DESCRIPTION:

    Title: \;THE GENOTYPE-PHENOTYPE LANDSCA PE OF AN ALLOSTERIC PROTEIN

    Speaker: \;David Ross\, National Institute of Standards and Technology (NIST)

    Hosted by: \;Arpita Upadhyaya &\; \;Jeffery Klauda

    Abstract: \;

    Allostery is a fundamental b iophysical mechanism that underlies cellular sensing\, signaling\, and meta bolism. Yet\, because of its structurally distributed nature\, a quantitati ve understanding of allosteric genotype-phenotype relationships remains elu sive. To provide the large-scale data needed to inform predictive models of allosteric function\, we have developed a method to quantitatively measure the dose-response curves and matching DNA sequences for every variant in a large library of allosteric sensor proteins. As a first demonstration of t he method\, we created a library of nearly 100\,000 variants of the LacI ge netic sensor in \;E. coli. We used an automated culture protocol and a combination of long- and short-read DNA sequencing to measure the dose-resp onse curves and corresponding DNA sequences for every variant. With the res ulting data\, we can identify LacI genotypes with precisely targeted dose-r esponse. For example\, we engineered sensors with sensitivities (i.e. \ ;EC50) spanning 3 orders of magnitude with a 1.25-fold accuracy. In additio n\, the resulting data provide a quantitative map of the effect of amino ac id substitutions on LacI allostery and reveal systematic sequence-structure -function relationships. We find that in many cases\, allosteric phenotypes can be quantitatively predicted with additive or neural-network models\, b ut unpredictable changes also occur. For example\, we were surprised to fin d \;many LacI variants with phenotypes that differ qualitatively from t he wild-type\, including variants with an inverted phenotype and others wit h a never-before-seen band-stop (on-off-on) phenotype. These qualitative ph enotypic changes are particularly interesting because they can provide spec ific insight into the biophysics of protein allostery and because they high light the capability for evolutionary innovation that is inherent to allost eric biomolecules.

    Join Zoom Meeting:

    Time: \ ;February 8\, \;2021 \;@ 4:00PM Eastern Time (US and Canada)  \;  \;
    https://umd.zoom.us/j/92682202606?pw d=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 822 0 2606
    Passcode: 741889


    LAST-MODIFIED:20210204T204626Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210922T190000Z DTEND:20210922T200000Z DTSTAMP:20260828T094430Z UID:4ja7d2c06msvqe5ai0c3bm8qtt@google.com CREATED:20210907T162051Z DESCRIPTION:Seminar will be conducted via zoom: https:// umd.zoom.us/j/99307158788

    Speaker: Phuc Nguyen\, Lehman College\ , CUNY and University of Haifa \;

    Title: \;
    Modular Hamil tonians of excited CFT states

    Abstract:
    We consider excited state s in a conformal field theory\, obtained by applying a weak unitary perturb ation to the vacuum\, and study the corresponding modular Hamiltonian for t he Rindler half-space. The perturbation is generated by the integral of a l ocal operator \;of modular weight n over a spacelike surface passing th rough x = 0. We find that if the perturbation has support at the boundary\, then in addition to bulk terms the modular Hamiltonian has a novel contrib ution which \;takes the form of an integral over the Rindler horizon of a linear combination of the perturbing operator \;and its descendants.  \;We briefly comment on the implications for holography. LAST-MODIFIED:20210908T132933Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210322T110000 DTEND;TZID=America/New_York:20210322T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210322T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: The one-electron model of graphene: A mathematical perspective

    Speaker: Charles Fefferma n\, Department of Mathematics\, Princeton

    Abstract: The talk presents theorems comparing continuum one-electron models of graph ene with tight binding and other approximations. Joint work with Micael Wei nstein\, James Lee-Thorp and Jacob Shapiro.



    We are hosting the S pring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affilia tes will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on Yo uTube. Once a seminar starts\, you will find a link to the live stream on o ur YouTube page at \;htt ps://www.youtube.com/user/JQInews. LAST-MODIFIED:20210204T014812Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T220000Z DTEND:20220406T005000Z DTSTAMP:20260828T094430Z UID:6005k5mkpsuc7tl7i6ovurut3f@google.com CREATED:20220210T145746Z DESCRIPTION:Bill Dorland presents the film Failsafe as part of the Science and Society via Film course. All are welcome. For infor mation and the entire semester's schedule\, see the course website: https://www.physic s.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145746Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Failsafe TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220908T140000Z DTEND:20220908T150000Z DTSTAMP:20260828T094430Z UID:35d0c7k6rm477h4m4t68dhu8mu@google.com CREATED:20220901T142816Z DESCRIPTION:Title:  Efficient experimental verification of quantum computer s and quantum simulators via randomized analog verification
    Speaker:  Ry an Shaffer (UC Berkeley)
    Time:  Thursday\, September 8\, 2022 - 10:00am< br>Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536

    Near-term quantum informatio n processors will not be capable of quantum error correction\, but instead will implement algorithms using the physical native interactions of the dev ice. These interactions can be used to implement quantum gates that are oft en continuously-parameterized (e.g.\, by rotation angles)\, as well as to i mplement analog quantum simulations that seek to explore the dynamics of a particular Hamiltonian of interest. In this talk\, I will discuss the rando mized analog verification (RAV) technique for efficient experimental verifi cation of continuously-parameterized quantum gate sets and analog quantum s imulators\, including numerical and experimental demonstrations to show the effectiveness of the technique.

    References:
    1. “Practical verifi cation protocols for analog quantum simulators”. Ryan Shaffer\, Eli Megidis h\, Joseph Broz\, Wei-Ting Chen\, Hartmut Häffner. npj Quantum Information 7\, 46 (2021). https://doi.org/1 0.1038/s41534-021-00380-8

    2. “Efficient verification of continuo usly-parameterized quantum gates”. Ryan Shaffer\, Hang Ren\, Emiliia Dyrenk ova\, Christopher G. Yale\, Daniel S. Lobser\, Ashlyn D. Burch\, Matthew N. H. Chow\, Melissa C. Revelle\, Susan M. Clark\, Hartmut Häffner. arXiv:220 5.13074 (2022). https://arxiv.org/abs/2205 .13074

    Bio:  Ryan Shaffer is a PhD candidate in Hartmut Häffner& #39\;s group at UC Berkeley and is also a research intern working with Moha n Sarovar at Sandia National Labs. Ryan has previously worked at Microsoft and Facebook. His PhD has been supported by DoD NDSEG and NSF QISE-NET fell owships. LAST-MODIFIED:20220901T142815Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Ryan Shaffer TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220808T170000Z DTEND:20220808T180000Z DTSTAMP:20260828T094430Z UID:514oigmmel5rtat0pb47hggna1@google.com CREATED:20220722T155626Z DESCRIPTION:Speaker: Mishkat Bhattacharya from Rochester Institute of Techn ology\n\nTitle: Cavity Optomechanical Sensing and Manipulation of an Atomic Persistent Current\n\nAbstract: In this talk I will describe our recent th eoretical work showing how several problems in atomic superfluid rotation c an be addressed using the versatile toolbox of cavity optomechanics [1]. W e consider an annular Bose-Einstein condensate\, which exhibits dissipation less flow and is a paradigm of rotational quantum physics\, inside a cavity excited by optical fields carrying orbital angular momentum. We show that this configuration provides the first platform that can sense ring Bose-Ein stein condensate rotation with minimal destruction\, in situ and in real ti me\, unlike demonstrated techniques\, all of which involve fully destructiv e measurement. It also shows how light can actively manipulate rotating mat ter waves by optomechanically entangling persistent currents. Our work ope ns up a novel and useful direction in the sensing and manipulation of atom ic superflow.\n\n[1] P. Kumar\, T. Biswas\, K. Feliz\, R. Kanamoto\, M.-S. Chang\, A. K. Jha and M. Bhattacharya\, Phys. Rev. Lett. 127\, 113601 (2021 ).\n\nBio: Mishkat Bhattacharya is an Associate Professor of physics at the Rochester Institute of Technology\, Rochester\, NY. His interests lie in\n theoretical quantum optics. His research has been recognized with an NSF Ca reer award (2015) and was selected as one of the Breakthroughs\nof the Year by Optics and Photonics magazine (2019). LAST-MODIFIED:20220722T155804Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Mishkat Bhattacharya TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T110000 DTEND;TZID=America/New_York:20211129T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211129T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Christopher Laumann \n\nInstitition: Boston University \n\nTitle: The fine structure of quantum spin ice\n\nAbstract: Quantum spi n liquids are low temperature phases of magnetic materials in which quantum fluctuations prevent the establishment of long-range magnetic order. These phases support fractionalized spin excitations (spinons) coupled to emerge nt photons. In this talk\, I will review the basic picture of how quantum electrodynamics emerges in 3D spin ice and then turn to several results reg arding its `fine structure'. I will argue that the fine structure constant 𝜶 -- the dimensionless coupling which controls the interactions between li ght and matter -- generically takes values ~0.1 in quantum spin ice\, much larger than the 𝜶 ~ 1/137 of our universe [1]. The large fine structure co nstant modifies the spinon dynamics considerably. The consequent qualitativ e features in inelastic neutron scattering could help identify these phases [2]. Time permitting\, I will also discuss how axions can appear in the sy stem [3].\n\n[1] Pace\, Morampudi\, Moessner\, Laumann. Phys. Rev. Lett. 12 7\, 117205 (2021).\n[2] Morampudi\, Wilczek\, Laumann. Phys. Rev. Lett. 124 \, 097204 (2020).\n[3] Pace\, Castelnovo\, Laumann. arXiv:2109.06890.\n\nHo st: Jay Sau LAST-MODIFIED:20220617T080754Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210301T110000 DTEND;TZID=America/New_York:20210301T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210301T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Synthesis and characterization of qu antum defects for quantum network applications: from deep centers in diamon d to shallow impurities in ZnO

    Speaker: Kai-Mei Fu\, University of Washington

    Abstract: Point defects in crystals are the solid state analog to trapped ions. Thus these “quantum d efects” have gained popularity as qubit candidates for scalable quantum net works. \; In this talk\, I will introduce some of the basic quantum def ect properties desirable for quantum network applications and give some ill ustrative examples of recent successes toward scalable quantum networks\, h ighlighting my group’s work on single NV centers in diamond and shallow don ors in ZnO. I will also discuss outstanding challenges (or opportunities) t oward scaling quantum systems based on defects\, which include photon loss and maintaining spin and optical coherence in integrated devices. \;


    Bio: Kai-Mei is an Associate Professor of Physics and Electrical an d Computer Engineering at the University of Washington. Her research focuse s on understanding and engineering the quantum properties of point defects in crystals\, and utilizing these properties in photonic devices for quantu m information and sensing applications. Kai-Mei Fu received her A.B. in Phy sics from Princeton University in 2000 and Ph.D. in Applied Physics from St anford University in 2007



    We are hosting the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will re ceive a Zoom link in an email announcing each seminar. For those without ac cess to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.yo utube.com/user/JQInews. LAST-MODIFIED:20210210T011324Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210511T150000Z DTEND:20210511T160000Z DTSTAMP:20260828T094430Z UID:74ups3aeuj8u8q9i1oohno2bs7@google.com CREATED:20210505T145358Z DESCRIPTION:Speaker: Yizhi You (Princeton)

    Title:  \;"Fracton critical point and Topological phase transition beyond renormali zation" \;


    Abstract: \;The theory of quant um phase transitions separating different phases with distinct symmetry pat terns at zero temperature is one of the foundations of modern quantum many- body physics. In this talk\, I will demonstrate that the existence of a 2D topological phase transition between a higher-order topological insulator ( HOTI) and a trivial Mott insulator with the same symmetry eludes this parad igm. A significant new element of our phase transition theory is that the i nfrared (IR) effective theory is controlled by short wave-length fluctuatio ns so the critical phenomenon is beyond the renormalization perspective.&nb sp\;

    Host Yang-Zhi Chou

    For Zoom details ema il Rcawthor@umd.edu LAST-MODIFIED:20210505T145557Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210514T190000Z DTEND:20210514T203000Z DTSTAMP:20260828T094430Z UID:27gci5p8cqleu8vrhsndueuifa@google.com CREATED:20210511T134234Z DESCRIPTION:Title : Extreme Plasma Astrophysics of Black Holes and Neutron Stars

    Speaker Name: Sasha Philippov

    Speaker Institution : Fla tiron Intstitute

    Abstract : Neutron stars and black holes are powerf ul sources of broad-band non-thermal electromagnetic emission\, including c oherent radio and high-energy radiation. The collective behavior of plasmas that produce these emission signatures is still poorly understood. In orde r to allow modeling emission signatures from first principles\, I construct radiative kinetic plasma simulations of neutron star and black hole enviro nments. In this talk I will describe applications of these methods to the u nderstanding of multi-wavelength pulsar emission mechanism\, including the long-standing problem of the generation of coherent radio waves. I will als o highlight recent work on pair plasma discharges and flares near supermass ive black holes.

    Notes: For Zoom meeting information please contact John Cullinan (jcullina@umd.edu)
    < br>Host Name: John Cullinan
    Host E-Mail: \;jcullina@umd.edu LAST-MODIFIED:20210511T134234Z LOCATION:For Zoom meeting information please contact John Cullinan (jcullin a@umd.edu) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210412T110000 DTEND;TZID=America/New_York:20210412T113000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210412T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: \;Observation of a dynamical pur ification phase transition in a trapped-ion quantum computer

    Speaker: Crystal Noel\, JQI Postdoc

    Abstract: When measurements are interspersed in random quantum circuits\, the long -time entanglement of the system exhibits a phase transition with the varyi ng density of measurements. With high measurement rates\, a "pure'' phase e merges where the measurements rapidly project the system into a determinist ic  \;state\, conditioned on the measurement outcomes. However\, in the "mixed'' phase\, the dynamics successfully encode quantum information from the initial state  \;into a quantum error correcting code-space. This "purification phase transition" is reminiscent of a fault-tolerant threshol d. Here\, we use a single reference qubit entangled with the larger system to efficiently study these quantum phases. We probe the purification dynami cs by sampling hundreds of instances of random circuits using a quantum com puter with 13 trapped 171Yb+ ions as the qubits. On the accessible circuit depths and system sizes\, we find conclusive evidence of the two phases and show numerically that\, with modest increases in circuit depth and system size\, critical properties of the purification transition clearly emerge.&n bsp\;



    We are hosting the Spring 2021 JQI Seminars virtual ly as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we wi ll also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210318T004923Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T180000Z DTEND:20220407T190000Z DTSTAMP:20260828T094430Z UID:2vj4kcrs8v1dp952ja631g5tl6@google.com CREATED:20220325T030523Z DESCRIPTION:Title: The Complexity of Near-Term Quantum Computers\nSpeaker: Daniel Grier (University of Waterloo )\nTime: Thursday\, April 7\, 2022 - 2:00pm\nLocation: IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/980951 31895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09\n\nQuantum computing is at a n exciting moment in its history\, with some high-profile experimental succ esses in building programmable quantum devices. That said\, these quantum devices (at least in the near term) will be restricted in several ways\, ra ising questions about their power relative to classical computers. In this talk\, I will present three results which give us a better understanding of these near-term quantum devices\, revealing key features which make them s uperior to their classical counterparts.\n\nFirst\, I will show that consta nt-depth quantum circuits can solve problems that cannot be solved by any c onstant-depth classical circuit consisting of AND\, OR\, NOT\, and PARITY g ates---giving the largest-known unconditional separation between natural cl asses of quantum and classical circuits. Second\, I will show that these q uantum circuits can nevertheless be simulated quickly by classical algorith ms that have no depth restriction\, emphasizing the role that depth plays i n provable quantum advantage. Finally\, I will address some of the experim ental challenges in implementing linear optical quantum computers\, and I w ill prove that they outperform classical computers using standard conjectur es but in more practical experimental regimes. LAST-MODIFIED:20220325T030523Z LOCATION:IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?p wd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Daniel Grier TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T160000Z DTEND:20220427T170000Z DTSTAMP:20260828T094430Z UID:023quvevuklsaqqav6brllsuhi@google.com CREATED:20220207T165233Z LAST-MODIFIED:20220207T165233Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210310T203000Z DTEND:20210310T213000Z DTSTAMP:20260828T094430Z UID:387pl4uscb864t57afa0q4e516@google.com CREATED:20210303T150153Z DESCRIPTION:Title : Rethinking Computing System Architectures with 3D Silic on Photonic-Electronic Integrated Circuits\n\nSpeaker Name: Professor S. J. Ben Yoo\nSpeaker Institution : University of California\, Davis\n\nAbstrac t : If we were to completely redesign and rearchitect a computing system wi th new hardware and software tools we have available today or in the near f uture\, what would it look like? Traditional computing systems based on von Neumann and non von Neumann architectures both face severe limitations in their performance and energy-efficiency where data movements and arbitratio n often become bottlenecks. Photonic interconnects offer high-degrees of pa rallelism\, scalable bandwidth\, low latency\, and low-power dissipation th at remain independent of capacity and distance. For neuromorphic computing\ , we will discuss attojoule nanophotonic neurons in photonic neural network s to enable extremely energy-efficient neuromorphic computing. For von Neum ann computing\, we will give examples of 3D EPIC based cacheless computing systems offering deterministic ultralow latency with bandwidth/FLOPs exceed ing 5Bytes/FLOP.\n\nHost: LPS LAST-MODIFIED:20210303T150154Z LOCATION:Virtual: Contact LPS_Seminar@lps.umd.edu for zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220906T160000 DTEND;TZID=America/New_York:20220906T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20230510T035959Z;BYDAY=TU EXDATE;TZID=America/New_York:20230110T160000 EXDATE;TZID=America/New_York:20221227T160000 EXDATE;TZID=America/New_York:20221220T160000 EXDATE;TZID=America/New_York:20230117T160000 EXDATE;TZID=America/New_York:20230103T160000 EXDATE;TZID=America/New_York:20221108T160000 EXDATE;TZID=America/New_York:20230124T160000 EXDATE;TZID=America/New_York:20230131T160000 EXDATE;TZID=America/New_York:20230321T160000 EXDATE;TZID=America/New_York:20221011T160000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com CREATED:20210423T130624Z LAST-MODIFIED:20210423T130716Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221026T193000Z DTEND:20221026T213000Z DTSTAMP:20260828T094430Z UID:4ki3a9vn0i2rfudon07ltiqdbv@google.com CREATED:20220815T131114Z DESCRIPTION:Speaker: Dr. Nasim Alem\, Associate Professor\, Materials Scien ce and Engineering\, The Pennsylvania State University

    Title: TBA


    Abstract: \;https://www.matse.psu.ed u/directory/nasim-alem LAST-MODIFIED:20220815T131115Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220928T173000Z DTEND:20220928T190000Z DTSTAMP:20260828T094430Z UID:3nhoelk69ikbde4mgfg6dlubkr@google.com CREATED:20220727T185343Z DESCRIPTION:Speaker: John Doyle\, Harvard

    Will be preceded by lunch at 12:00pm

     \;Title: Cold and ultra-cold poly atomic molecules for quantum science

    Abstract: Polar molecules\, due to their intrinsic electric dipole moment and their controllable complexit y\, are a powerful platform for precision measurement searches for physics beyond the standard model (BSM) and\, potentially\, for quantum simulation/ computation. This has led to many experimental efforts to cool and control molecules at the single quantum state level. Polyatomic molecules have attr acted new focus as potential novel quantum resources with distinct advantag es - and challenges - compared to both atoms and diatomic molecules. I will discuss features of polyatomic molecules can be used in quantum simulation /computation\, the search for BSM physics\, and ultracold chemistry. I will discuss our results on the laser cooling of molecules into the ultracold r egime\, including the laser cooling of the polyatomic molecules SrOH\, YbOH \, CaOH and CaOCH3. Finally\, if time permits\, I will discuss recent measu rements that support the vision of extending laser cooling to much larger m olecules.
     LAST-MODIFIED:20220817T164016Z LOCATION:462 in the JHU Bloomberg Center for Physics and Astronomy SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220218T180000Z DTEND:20220218T184500Z DTSTAMP:20260828T094430Z UID:6vaf3ln9tt7e9he3ma54hj38v5@google.com CREATED:20220211T225950Z DESCRIPTION:Title: Clustering of steady-state correlations in open systems with long-range interactions\nSpeaker: Andrew Guo (QuICS)\nTime: Friday\ , February 18\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: ht tps://umd.zoom.us/j/96160177762\n\nLieb-Robinson bounds are powerful analyt ical tools for constraining the dynamic and static properties of non-relati vistic quantum systems. Recently\, a complete picture for closed systems th at evolve unitarily in time has been achieved. In experimental systems\, ho wever\, interactions with the environment cannot generally be ignored\, and the extension of Lieb-Robinson bounds to dissipative systems which evolve non-unitarily in time remains an open challenge. In this work\, we prove tw o Lieb-Robinson bounds that constrain the dynamics of open quantum systems with long-range interactions that decay as a power-law in the distance betw een particles. Using a combination of these Lieb-Robinson bounds and mixing bounds which arise from "reversibility''—naturally satisfied for thermal e nvironments---we prove the clustering of correlations in the steady states of open quantum systems with long-range interactions. Our work provides an initial step towards constraining the steady-state entanglement structure f or a broad class of experimental platforms\, and we highlight several open directions regarding the application of Lieb-Robinson bounds to dissipative systems.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220211T225950Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Andrew Guo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210426T200000Z DTEND:20210426T210000Z DTSTAMP:20260828T094430Z UID:4oa7efmp43k2820h74o815as8q@google.com CREATED:20210111T171034Z DESCRIPTION:

    Title: \;Bend and break\, twist and shake: the impact of chromatin elastici ty on chromosome fragility in human cancers.

    Speaker:  \; \;Yamini Dalal\, \;National Ins titutes of Health \;- \;National Cancer Institute \; \;

    Hosted by: \;Arpita Upadhyaya &\; Garegin Pa poian

    Abstract: \;

    Dr. Dalal will discuss her lab's work investigating how mechanical and structural features of chromatin\, es pecially histone variants which are involved in epigenetics\, contribute to chromosome dysfunction in human cancers. \;



    Zoom Lin k:

    Time: \;April 26\, \;2021 \;    @ 4:00PM Ea stern Time (US and Canada) \;  \;
    Join Zoom Meeting
    https://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0N ndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889 LAST-MODIFIED:20210420T164348Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T150000Z DTEND:20211027T161500Z DTSTAMP:20260828T094430Z UID:0q9m1b946bos3m058mopne0f74@google.com CREATED:20210914T155024Z DESCRIPTION:Speaker: Jay Amicangelo\, Penn State Behrend - \;https://behrend.psu.e du/person/jay-charles-amicangelo

    Title: Characterization of Hydr ogenated Radicals Using Matrix Isolation Infrared Spectroscopy

    Abstr act: \;The matrix isolation spectroscopy technique is an experimental t echnique that wasdeveloped for the stabilization and spectral characterizat ion of transient species\,such as radicals\, molecular ions\, coordinativel y unsaturated species\, and weakintermolecular complexes. In this technique \, a transient species is generated\,trapped in a low temperature solid mat rix of inert material\, and thenspectroscopically interrogated. Generally\, the solid matrix is kept at temperaturesbelow 20 K\, which reduces the pos sibility of unimolecular decomposition\, andisolation in the solid matrix e nvironment reduces the occurrence of bimolecularreactions involving the tra nsient species. Solid matrix materials are typically raregases (Ne\, Ar\, K r\, Xe)\, but molecular gases such as N2 and H2 can also be used. Inthis ta lk\, I will describe two projects involving the reaction of hydrogen atoms withtwo different aromatic ring systems to produce mono-hydrogenated aromat icradicals (H· + R → RH·) and the characterization of the infrared spectra of theradicals using matrix isolation infrared spectroscopy. LAST-MODIFIED:20211020T143924Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T193000Z DTEND:20220330T203000Z DTSTAMP:20260828T094430Z UID:35lo4f30nq5cjd1gihp701hs2q@google.com CREATED:20220323T192955Z DESCRIPTION:

    LPS Seminar

    Wednesday\, March 30th\, 2022\, 3:30 PM

     \;

    2D THz Optoelectronics

    Pro fessor Thomas Murphy\, Department of Electrical and Computer Engineering\, University of Maryland College Park



    Abstract:  \;The tera hertz (THz) region of the electromagnetic spectrum spans the gap between op tics and electronics and has historically suffered from paucity of optoelec tronic devices\, in large part because of inadequate optical materials that function in this spectral range. \; Two-dimensional materials\, includ ing graphene and a growing family of related van der Waals materials\, have been shown to exhibit unusual optical and electrical properties that could enable diverse new applications in the THz regime. \; In this presenta tion\, we will present some of our own research to understand and exploit 2 D materials for THz optoelectronic applications\, including nonlinear optic al devices\, THz modulation\, and THz detection.

    Bio:  \;Thomas E. Murphy received bachelors degrees in Electrical Engineering and Physics from Rice University in 1994. \; He then studied Electrical and Compute r Engineering at Massachusetts Institute of Technology\, receiving the MS d egree in 1997 and Ph.D degree in 2001. \; He was employed as a member o f the technical staff at MIT Lincoln Laboratory from 2001-2002\, and joined the faculty at the University of Maryland in 2002. \; He currently hol ds a joint appointment as a Professor in the Department of Electrical &\ ; Computer Engineering and Director of the Institute for Research in Electr onics &\; Applied Physics. \; His research interests include teraher tz and microwave photonics\, two-dimensional optoelectronics\, integrated o ptics\, nonlinear and ultrafast optics\, electrooptics\, and nonlinear dyna mical systems. \; \;

    -- Do not delete o r change any of the following text. --

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    Meeting password: twSWxuYB275 \;

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    LAST-MODIFIED:20220323T192955Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=md4253a6be1a43f7178491be8 adb68c86 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: 2D THz Optoelectronics (Professor Thomas Murphy) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T180000Z DTEND:20220509T190000Z DTSTAMP:20260828T094430Z UID:575jqvm04al9l69fptksq3ba2c@google.com CREATED:20220426T011302Z DESCRIPTION:Title: Topological order and error correction on fractal geome tries: fractal surface codes\nSpeaker: Arpit Dua (Caltech)\nTime: Monday\ , May 9\, 2022 - 2:00pm\nLocation: ATL 3100A and Virtual Via Zoom: https://um d.zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nIn this talk\, I will focus on topological order and error correction on fractal ge ometries. Firstly\, I will present a no-go theorem that Z_N topological or der cannot survive on any fractal embedded in two spatial dimensions and th en show that for fractal lattice models embedded in 3D or higher spatial di mensions\, Z_N topological order survives if the boundaries on the holes co ndense only loop or membrane excitations. Next\, I will discuss fault-tole rant logical gates in the Z_2 version of these fractal models\, which we na me as fractal surface codes\, using their connection to global and higher-f orm topological symmetries. In the second half of the talk\, I will discuss the performance of such fractal surface codes as fault-tolerant quantum me mories. I will discuss decoding strategies with provably non-zero threshold s for bit-flip and phase-flip errors in the fractal surface codes with Haus dorff dimension 2+\\epsilon. In particular\, I will describe the adaptation of the sweep decoder to fractal lattices which maintains its self-correcti ng and single-shot nature and state the code performance of a particular fr actal surface code with Haussdorff dimension 2.966. I will summarize with s ome exciting ongoing directions. LAST-MODIFIED:20220426T011302Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Arpit Dua TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T200000Z DTEND:20220307T213000Z DTSTAMP:20260828T094430Z UID:4ir7i7ol8mmps35lodjjr7ugp9@google.com CREATED:20220118T150443Z DESCRIPTION:Speaker: Cari Cesarotti\, Harvard

    Title: Prob ing Dark Gauge Forces with a High-Energy Muon Beam Dump

    Abstract:&nb sp\;We propose a new beam dump experiment at a future TeV-scale muon collid er. A beam dump would be an economical and effective way to increase the di scovery potential of the collider complex in a complementary regime. In thi s work we consider vector models such as the dark photon and $L_\\mu-L_\\ta u$ gauge boson as new physics candidates and explore which novel regions of parameter space can be probed with a muon beam dump. We find that for the dark photon model\, we gain sensitivity in the moderate mass (MeV--GeV) ran ge at both higher and lower couplings compared to existing and proposed exp eriments\, and gain access to previously untouched areas of parameter space of the $L_\\mu-L_\\tau$ model.
     LAST-MODIFIED:20220303T152446Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211115T213000Z DTEND:20211115T223000Z DTSTAMP:20260828T094430Z UID:4o5o1r60po41kbjb0hro59qihb@google.com CREATED:20211102T073612Z DESCRIPTION:Title: Cosmic Rays at Heliospheric Extremes: Recent Measurement s by Voyager and Parker Solar Probe\n\nSpeaker: Jamie S. Rankin\, Princeton University\n\nAbstract: In 2012\, during the centennial year of the discov ery of cosmic rays\, Voyager 1 crossed the heliopause and began making the very first in-situ observations of the surrounding interstellar medium. Joi ned by Voyager 2 in 2018\, these twin spacecraft continue to provide critic al measurements of cosmic rays in a surprising\, previously-unexplored plas ma regime. Meanwhile\, in 2018\, Parker Solar Probe made history by explori ng another new regime\, venturing closer to the Sun than any spacecraft bef ore it. This talk will highlight the new insights\, discoveries\, and open questions that have arisen from in-situ measurements of low-energy cosmic r ays (few to hundreds of MeV) at these two extremes and how they relate to t he current understanding of our own global astrosphere.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211102T073643Z LOCATION:Location: Online via Zoom\, visit https://bit.ly/2PmJoT6 for acces s SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220225T180000Z DTEND:20220225T184500Z DTSTAMP:20260828T094430Z UID:5ejomkcvknenjcfronujebn1oo@google.com CREATED:20220215T173047Z DESCRIPTION:Title: Using a trapped ion quantum computer to simulate NMR sp ectra\nSpeaker: Debopriyo Biswas (Duke University)\nTime: Friday\, Februa ry 25\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://um d.zoom.us/j/96160177762\n\nNuclear magnetic resonance (NMR) spectroscopy is a useful tool in understanding molecular composition and dynamics\, but si mulating NMR spectra of large molecules becomes intractable on classical co mputers as the spin correlations in these systems can grow exponentially wi th molecule size. In contrast\, quantum computers are well suited to simula te NMR spectra of molecules\, particularly zero- to ultralow field (ZULF) N MR where the spin-spin interactions in the molecules dominate. In this work \, we demonstrate the first quantum simulation of an NMR spectrum\, specifi cally that of the methyl group of acetonitrile in ZULF\, using a trapped io n quantum computer. The simulation involves state-of-the-art “QFAST” circui t synthesis algorithm that produces short circuits\, with the circuit sampl ing rate considerably reduced by employing a compressed sensing technique. This work lays the foundation for simulation of NMR experiments on near-ter m quantum hardware.\n\n(Pizza and refreshments will be served after the tal k.) LAST-MODIFIED:20220215T173047Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Debopriyo Biswas TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210329T160000 DTEND;TZID=America/New_York:20210329T170000 DTSTAMP:20260828T094430Z UID:303hccg6b1atvum48cq5pd58hn@google.com RECURRENCE-ID;TZID=America/New_York:20210329T160000 CREATED:20210111T154105Z DESCRIPTION:Speaker: Hiren Patel\, UCSC

    Title and abstract: tk
    For zoom link please email mknouse@umd.e du LAST-MODIFIED:20210112T203200Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210527T130000Z DTEND:20210527T140000Z DTSTAMP:20260828T094430Z UID:6eo7p0auh1nl88jb2a7pfpn84c@google.com CREATED:20210419T155529Z DESCRIPTION:Four lectures on important issues of our time. Victor Yakovenko will speak on June 24.

    https://aub.edu.lb/fas/physics/Pages/public_pol icy.aspx
     \;

    Registration Link

    ​https://zoom.us/j/97858100666?pwd=Q2RwTmdYc0ZNNjlIdnQr bTdFNkgvQT09​


    ​Meetin g ID: 978 5810 0666

    Passcode: 037532

    ​  \; LAST-MODIFIED:20210419T155921Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics and Public Policy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210927T203000Z DTEND:20210927T213000Z DTSTAMP:20260828T094430Z UID:305oo1t6gg9h5aj1b3ltl3dd2j@google.com CREATED:20210913T164314Z DESCRIPTION:Title: Modeling Blazar Jets with Particle Transport Methods (an d a discussion of Snowmass)

    Speaker: Tiffany Lewis\, NASA Goddard Sp ace Flight Center

    Abstract: Blazars are luminous active galaxies wit h a jet pointed along our line of sight. They give us a unique view into on e of the most extreme particle acceleration regions in the Universe\, with observations across the entire electromagnetic spectrum. Blazars are the mo st numerous extragalactic sources in the gamma-rays\, and can have variabil ity timescales on the order of minutes. However\, the particle acceleration mechanisms that give rise to the power in these observed signals are not w ell understood. One method of addressing this problem intuitively is to sim ulate the particle energies from first principles\, and then carefully calc ulate observables\, like time lags\, spectra\, and polarization fraction\, to compare with existing data or predict observables for upcoming missions like AMEGO-X. \;Snowmass is a collective (inter)nation al scientific planning process that helps determine the future foci of the High-Energy Physics and Astrophysics (HEPA) community. The Snowmass Process takes place every 5–10 years and shapes the goals for experimentalists and theorists for the next 10–20 years through funding priority recommendation s for NSF and DOE. Discussions of the future of HEPA take place over multip le research "Frontiers\," including Energy\, Neutrino Physics\, Cosmic. Thr ough discussions and white papers\, you can steer the future of HEPA resear ch. The process culminates in the community informing the next Particle Phy sics Project Prioritization Panel (P5). LAST-MODIFIED:20210925T210609Z LOCATION:Via Zoom. Visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210416T180000Z DTEND:20210416T190000Z DTSTAMP:20260828T094430Z UID:53a5euetm89fvlkbup4bjm909d@google.com CREATED:20210201T193040Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Nathan Wiebe\, University of Toronto

    Title: New Quant um Simulation Methods for Fermionic Systems

    Abstract: The ability o f quantum computers to circumvent the fermionic sign problem has led to the possibility that quantum simulation may one day lead to practical solution s for solving strongly correlated electronic systems. In this talk I will discuss recent simulation results using several new methods\, Qubitization\ , the interaction picture simulation method and Trotter-Suzuki simulation m ethods to lower the costs of simulating chemistry by five orders of magnitu de from the original estimates given in 2016. In addition\, I will discuss recent work by my collaborators and I that shows that effective QED can be simulated on a quantum computer using resources that are comparable to tho se required for non-relativistic simulations. This raises the possibility of near-term solutions to strongly correlated electronic systems where the role of pair production cannot be neglected. Both of these applications\, interestingly\, are best solved using different simulation methods suggesti ng that there is not a single best simulation method but rather a set of th ree different methods that each have their domain of applicability. A majo r point of this talk will be to identify the physical structures that these algorithms exploit and provide intuition for when each of the simulation a lgorithms should be applied. LAST-MODIFIED:20210413T131443Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220207T160000 DTEND;TZID=America/New_York:20220207T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20220503T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20220321T160000 EXDATE;TZID=America/New_York:20220418T160000 EXDATE;TZID=America/New_York:20220314T160000 EXDATE;TZID=America/New_York:20220502T160000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com CREATED:20220131T204640Z LAST-MODIFIED:20220131T204640Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210309T160000 DTEND;TZID=America/New_York:20210309T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210309T160000 CREATED:20200116T204737Z DESCRIPTION:

    ZOOM RECORDING

    https://umd.hosted.panopto.com/P anopto/Pages/Viewer.aspx?id=817925c7-215d-4876-aa36-ace6016efc19

    Zoom Meeting

    https://umd.zoom.us/j/94996221043?pwd=SmtsNWFhS3Z4 RkNlQnBEd3dZOWVaQT09

    Meeting ID: 949 9622 1043

    Passcode: 695798

    Speaker: James Drake< /p>

    Title: Magnetic Reconnection and Particle Acceleration in space and a strophysical systems

    Abstract: \;

    Magn etic reconnection is responsible for the explosive release of \;magneti c energy in space and astrophysical systems. Such impulsive \;energy re lease spans a wide variety of environments throughout the \;universe\, including solar and stellar flares\, flares in pulsar \;nebulae\, jets in active galactic nuclei and other astrophysical systems. What controls th e dynamics of reconnection and the mechanisms responsible for efficient par ticle acceleration are therefore topics \;of great scientific interest\ , especially in light of the goal to \;interpret simultaneous observati ons of gravitational waves and \;electromagnetic signatures in astrophy sical events. Observations reveal that a large fraction of released magneti c energy goes into \;energetic particles\, whose distributions take the form of power laws \;that extend many decades in energy. Theoretical i deas about the \;mechanism that drives these energetic particles during reconnection \;have changed dramatically over the past decade. Early i deas that parallel electric fields were the dominant driver have been displ aced by a new picture in which the growth and merging of large numbers of m agnetic flux ropes both release magnetic energy and efficiently drive energ y gain of particles. New computational and analytic models are for the firs t time reproducing the extended power laws seen in observations. The talk w ill emphasize basic physical concepts that reveal both the physics of magne tic reconnection and the mechanisms for particle energy gain.Host: W illiam (Bill) Dorland LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220825T180000Z DTEND:20220825T190000Z DTSTAMP:20260828T094430Z UID:73f4qu2lj02loejup6lffo0c3c@google.com CREATED:20220815T152125Z DESCRIPTION:Title:  Publicly Verifiable Quantum Money from Random Lattices< br>Speaker:  Andrey Boris Khesin (MIT)
    Time:  Thursday\, August 25\, 202 2 - 2:00pm
    Location:  Virtual Via Zoom: https://umd.zoom.us/j/98807853995

    Publicly verifiable quantum money is a protocol for the preparation of quantum states that can be effic iently verified by any party for authenticity but is computationally infeas ible to counterfeit. We develop a cryptographic scheme for publicly verifia ble quantum money based on Gaussian superpositions over random lattices. We introduce a verification-of-authenticity procedure based on the lattice di screte Fourier transform\, and subsequently prove the unforgeability of our quantum money under the hardness of the short vector problem from lattice- based cryptography. LAST-MODIFIED:20220815T152125Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/98807853995 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Andrey Boris Khesin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T150000 DTEND;TZID=America/New_York:20211129T163000 DTSTAMP:20260828T094430Z UID:585k1d3fbanr7t31kj3oqqkcr9@google.com RECURRENCE-ID;TZID=America/New_York:20211129T150000 CREATED:20210908T132458Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Patrick Dra per\, UIUC

    Title: The CKN Bound and Particle Physics

    Abstract : The holographic principle implies that quantum field theory overcounts th e number of independent degrees of freedom in quantum gravity. An argument due to Cohen\, Kaplan\, and Nelson (CKN) suggests that the number of degree s of freedom well-described by QFT is even smaller than required by hologra phic bounds\, and CKN interpreted this result as indicative of a correlatio n between the UV and IR cutoffs on QFT. We consider an alternative interpre tation in which the QFT degrees of freedom are depleted as a function of sc ale\, and we use a simple recipe to estimate the impact of depleted densiti es of states on precision observables. Although these observables are not s ensitive to the level of depletion motivated by gravitational consideration s\, the phenomenological exercises also provide an interesting test of QFT that is independent of underlying quantum gravity assumptions. A depleted d ensity of states can also render the QFT vacuum energy UV-insensitive\, rec onciling the success of QFT in describing ordinary particle physics process es and its apparent failure in predicting the cosmological constant.

    For zoom link please email mknouse@umd.ed u LAST-MODIFIED:20220617T080649Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T140000Z DTEND:20220412T150000Z DTSTAMP:20260828T094430Z UID:3kouiqhitgm8stm0t66kn8md6a@google.com CREATED:20220405T171230Z DESCRIPTION:Title: A quantum algorithm for thermal state preparation based on nonequilibrium fluctuation theorems\nSpeaker: Yigit Subasi (Los Alamos National Lab)\nTime: Tuesday\, April 12\, 2022 - 10:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91755777057?pwd=Z0U2dDVjRG1 icFBFN1VSbXZmbGtuQT09\n\nNonequilibrium fluctuation theorems provide a correspondence between properties of quantum systems in thermal equilibrium and work distributions arising in nonequilibrium processes. Building upon these theorems\, we present a quantum algorithm to prepare a purification o f the thermal state of a quantum system of interest. Unlike previous algori thms based on a thermalization process that brings an infinite-temperature state to one at finite temperature\, our algorithm assumes access to the pu rification of the thermal state of H0 to prepare a purification of the ther mal state of H1=H0+V at the same temperature. When the perturbation V is sm all\, even with a trivial nonequilibrium process our algorithm provides a s ignificant improvement over prior quantum algorithms in terms of complexity by exploiting the similarity between the two thermal states. Further impro vements arise from a judicious choice of the nonequilibrium process.\n\nI w ill start the talk with a review of fluctuation theorems relevant to this w ork before describing the thermal state preparation algorithm in detail. Th e essential ingredients of our algorithm are the definition of a "\;wor k operator"\;\, introduction of a work cutoff and an approximation of t he exponentiated work operator on a subspace of work values above the cutof f. Special cases of when H0 and H1 commute and when they are both local spi n Hamiltonians will be discussed. For the transverse field Ising model I wi ll numerically demonstrate the effect of using different nonequilibrium pro cesses on the complexity of the algorithm. LAST-MODIFIED:20220405T171230Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91755777057? pwd=Z0U2dDVjRG1icFBFN1VSbXZmbGtuQT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Yigit Subasi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210407T193000Z DTEND:20210407T203000Z DTSTAMP:20260828T094430Z UID:129t9nqclrnn6efopq8ngb2moe@google.com CREATED:20210326T212447Z DESCRIPTION:Title : The Advanced Tokamak Path to a Compact Fusion Pilot Pla nt

    Speaker Name: Richard Buttery

    Speaker Institution : Genera l Atomics

    Abstract : The Advanced Tokamak concept provides an attrac tive path to develop a compact and inexpensive "pilot plant" to demonstrate net electricity and resolve nuclear technology and breeding. It works thro ugh a fortuitous alignment of high pressure operation with strong self-driv en "bootstrap" current and low turbulent transport. Here\, great research p rogress in transport\, pedestal\, stability and energetic particle physics has identified the key principles behind a solution\, which will be explain ed in this talk. Furthermore\, new "full physics" simulations show the trad e-offs and path to optimize the approach: raising pressure increases fusion performance\, but increasing the density has greater leverage\, raising bo otstrap current and decreasing auxiliary current drive demands from expensi ve RF systems. The efficient solutions found have high energy confinement\, reducing the necessary fusion performance\, heat and neutron loads for a n et electric goal. Viable devices are predicted with a compact major radius of ~4m radius giving 200MW electricity at ~6T using conventional supercondu ctors\, or better still using high Tc superconductors at 7T\, which provide s greater performance margins and permits easier maintenance for the nuclea r research mission. The plasma exhaust is managed by a combination of core radiation\, flux expansion and radiative divertor\, although the challenges continuous operation require further configuration research to reduce eros ion. Overall this Compact Advanced Tokamak (CAT) approach provides an attra ctive and robust path to fusion energy\, with high performance and stabilit y. Further exciting research is underway at the DIII-D National Fusion Faci lity and elsewhere to validate the approach and test key technologies to ma ke such a device a reality.

    Host Name: Marc Swisdak
    Host E-Mail:& nbsp\;swisdak@umd.edu LAST-MODIFIED:20210326T212447Z LOCATION:Contact swisdak@umd.edu for Zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210422T130000Z DTEND:20210422T140000Z DTSTAMP:20260828T094430Z UID:1olrannn8nuiu4t6p5j4cd7133@google.com CREATED:20210419T155135Z DESCRIPTION:Four lectures on important issues of our time. Victor Yakovenko will speak on June 24.
     \;https://aub.edu.lb/fas/physics/Pages/public_policy.aspx
     \;

    Registration Link

    ​https: //zoom.us/j/97858100666?pwd=Q2RwTmdYc0ZNNjlIdnQrbTdFNkgvQT09 ​


    ​Meeting ID: 978 5810 06 66

    Passcode: 037532

    ​  \; LAST-MODIFIED:20210419T155838Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics and Public Policy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220519T140000Z DTEND:20220519T150000Z DTSTAMP:20260828T094430Z UID:76hfvo3ght4noc56vqmlnej6s2@google.com CREATED:20220510T174427Z DESCRIPTION:Title: Dequantizing the Quantum Singular Value Transfor mation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture
    Speaker: Sevag Gharibian (Paderborn University)
    Time: Th ursday\, May 19\, 2022 - 10:00am
    Location: Virtual Via Zoom: https: //uwaterloo.zoom.us/j/99584979176?pwd=R3FWeU5xK3FJT3pTYzFJek5pcVU0QT09< br>
    The Quantum Singular Value Transformation (QSVT) is a recent techniq ue that gives a unified framework to describe most quantum algorithms disco vered so far\, and may lead to the development of novel quantum algorithms. In this paper we investigate the hardness of classically simulating the QS VT. A recent result by Chia\, Gilyén\, Li\, Lin\, Tang and Wang (STOC 2020) showed that the QSVT can be efficiently "\;dequantized"\; for low- rank matrices\, and discussed its implication to quantum machine learning. In this work\, motivated by establishing the superiority of quantum algorit hms for quantum chemistry and making progress on the quantum PCP conjecture \, we focus on the other main class of matrices considered in applications of the QSVT\, sparse matrices.

    We first show how to efficiently &quo t\;dequantize"\;\, with arbitrarily small constant precision\, the QSVT associated with a low-degree polynomial. We apply this technique to design classical algorithms that estimate\, with constant precision\, the singula r values of a sparse matrix. We show in particular that a central computati onal problem considered by quantum algorithms for quantum chemistry (estima ting the ground state energy of a local Hamiltonian when given\, as an addi tional input\, a state sufficiently close to the ground state) can be solve d efficiently with constant precision on a classical computer. As a complem entary result\, we prove that with inverse-polynomial precision\, the same problem becomes BQP-complete. This gives theoretical evidence for the super iority of quantum algorithms for chemistry\, and strongly suggests that sai d superiority stems from the improved precision achievable in the quantum s etting. We also discuss how this dequantization technique may help make pro gress on the central quantum PCP conjecture.

    Joint work with Francoi s Le Gall (Nagoya University).

    (In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220510T174427Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/99584979176?pwd=R3FW eU5xK3FJT3pTYzFJek5pcVU0QT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Sevag Gharibian TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210505T150000Z DTEND:20210505T161500Z DTSTAMP:20260828T094430Z UID:03m7jrldhs2jk5k86jet4ra9e6@google.com CREATED:20210419T150722Z DESCRIPTION:Title: Fitting quantum noise models to tomography data\nSpeake rs: Tamara Kohler and Emilio Onorati (University College London)\nTime: We dnesday\, May 5\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.z oom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\n\nThe presence of noise is currently one of the main obstacles to achieving large-scale quan tum computation. Strategies to characterise and understand noise processes in quantum hardware are a critical part of mitigating it\, especially as th e overhead of full error correction and fault-tolerance is beyond the reach of current hardware. Non-Markovian effects are a particularly unfavorable type of noise\, being both harder to analyse using standard techniques and more difficult to control using error correction.\nIn this talk\, based on recent work https://arxiv.org/abs/2103.17243\, we present a set of efficien t algorithms building on the rigorous mathematical theory of Markovian mast er equations to analyse and evaluate unknown noise processes from a single (or a few) tomographic snapshot(s). In the case of time-independent Markovi an (or nearly Markovian) dynamics\, our algorithm outputs the best-fit Lind bladian\, i.e.\, the generator of a memoryless quantum channel which best a pproximates the tomographic data to within the given precision. In the case of non-Markovian dynamics\, it returns a quantitative and operationally me aningful measure of non-Markovianity in terms of isotropic noise addition.\ nWe provide a Python implementation of all our algorithms\, together with a range of 1- and 2-qubit numerics of synthesised noisy tomography data\, ge nerated using the Cirq platform\, showing that we succeed both in extractin g a full description of the best-fit Lindbladian to the measured dynamics\, and in computing accurate measures of non-Markovianity that match analytic al calculations.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/9893676372?pwd =VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\nMeeting ID: 989 367 6372\nPasscode: abc1 23\nOne tap mobile\n+12532158782\,\,9893676372# US (Tacoma)\n+13017158592\, \,9893676372# US (Washington DC)\nDial by your location\n+1 253 215 8782 US (Tacoma)\n+1 301 715 8592 US (Washington DC)\n+1 312 626 6799 US (Chicago) \n+1 346 248 7799 US (Houston)\n+1 669 900 6833 US (San Jose)\n+1 929 436 2 866 US (New York)\nMeeting ID: 989 367 6372\nFind your local number: https: //umd.zoom.us/u/abF3cNNZ0B\nJoin by SIP\n9893676372@zoomcrc.com\nJoin by H. 323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Nether lands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.1 22.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver) \n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20210419T150722Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220311T180000Z DTEND:20220311T184500Z DTSTAMP:20260828T094430Z UID:7qjnca85djiidf4obabdo1brjq@google.com CREATED:20220303T152445Z DESCRIPTION:Title: Simulating the Schwinger Model and Testing S ymmetry Protection with Trapped Ions
    Speaker: Nhung Nguyen (JQI)
    Time : Friday\, March 11\, 2022 - 1:00pm
    Location: ATL 2324 and Virtual Via Z oom: https://umd.zoom.us/j/9616 0177762

    Gauge theory is a powerful theoretical framework for und erstanding the fundamental forces in the standard model. Simulating the rea l time dynamics of gauge theory\, especially in the strong coupling regime\ , is a challenging classical problem.  \;Quantum computers offer a solu tion to this problem by taking advantage of the intrinsic quantum nature of the systems. The Schwinger model\, that is the 1+1 dimensional U(1) gauge theory coupled to fermions\, has served as a testbed for different methods of quantum simulation. Using a trapped-ion system with up to six qubits\, w e simulate the real-time dynamics of pair creation in the lattice Schwinger model\, the Schwinger model with discretized space dimension\, for times m uch longer than previously accessible. In this talk\, I will discuss the in tegrated theoretical\, algorithmic\, and experimental approach we used to a chieve this result. Specifically\, I will compare the gate requirement for two formulations of the model using the Suzuki-Trotter product formula\, an d explain the trade-off  \;between errors from the ordering of the Hami ltonian terms\, the Trotter step size\, and experimental imperfections. I w ill also present the result regarding the effectiveness of a recently propo sed symmetry-protection protocol by Tran et. al. and a symmetry-inspired po st-selection scheme for mitigating experimental errors.

    (Pizza and r efreshments will be served after the talk.)
     LAST-MODIFIED:20220303T155543Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Nhung Nguyen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220908T150000Z DTEND:20220908T160000Z DTSTAMP:20260828T094430Z UID:0jh3d9e9kbnrep0j7pbvoq4l09@google.com CREATED:20220804T153758Z DESCRIPTION:Speaker: Dr. Samarjit Patnaik\, NIH

    Title: "A n Introduction to the Early Translational Branch at NCATS\, NIH" &\; "Ca se Study: Discovery of Metarrestin\, A Prospective Small Molecule Therapeut ic for Metastatic Cancer"     LAST-MODIFIED:20220902T142019Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210324T193000Z DTEND:20210324T203000Z DTSTAMP:20260828T094430Z UID:4e5uq2421qd1sb0k0sbka1nt17@google.com CREATED:20210309T162913Z DESCRIPTION:Speaker Name: Marina Battaglia
    Speaker Institution : FHNW\, Switzerland

    Title : A multi-wavelength view on electron acceleration in solar flares
    Notes: Contact \;s wisdak@umd.edu \;for Zoom address
    Abstract : Solar flares are th e most energetic phenomena in the solar system\, releasing and converting e nergies up to 10^25 Joules. They allow us to study fundamental processes in magnetized plasmas such as energy release\, particle acceleration\, and pa rticle transport. The dominant signatures of solar flare- accelerated elect rons are in the X-ray and radio-wavelength domains. I will introduce the ma in concepts of X-ray and radio diagnostics of flare accelerated electrons. How do we observe at these wavelengths? What do we see? What can we learn f rom such observations about electron acceleration and transport? I will pre sent recent highlights from the analysis of data from past and present obse rvatories\, including first results from the Spectrometer/Telescope for Ima ging X-rays (STIX) on Solar Orbiter.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210309T162913Z LOCATION:Contact Marc Swisdak at swisdak@umd.edu for zoom link. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T160000 DTEND;TZID=America/New_York:20210125T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210512T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210329T160000 EXDATE;TZID=America/New_York:20210215T160000 EXDATE;TZID=America/New_York:20210419T160000 EXDATE;TZID=America/New_York:20210208T160000 EXDATE;TZID=America/New_York:20210322T160000 EXDATE;TZID=America/New_York:20210222T160000 EXDATE;TZID=America/New_York:20210308T160000 EXDATE;TZID=America/New_York:20210412T160000 EXDATE;TZID=America/New_York:20210201T160000 EXDATE;TZID=America/New_York:20210405T160000 EXDATE;TZID=America/New_York:20210125T160000 EXDATE;TZID=America/New_York:20210510T160000 EXDATE;TZID=America/New_York:20210301T160000 DTSTAMP:20260828T094430Z UID:6he7qnpm9dt692jcfcufhg48m3@google.com CREATED:20210423T163414Z DESCRIPTION:Speaker: Paolo Creminelli\, ICTPTitle: Inflation: perturbation theory and beyond.\n\nAbstract. Inflationary perturbations are approximate ly Gaussian and deviations from Gaussianity are the subject of an intense t heoretical and experimental study.\nDeviations from Gaussianity are usually calculated using perturbation theory. This method\, however\, fails for un likely events on the tail of the probability distribution\, like the format ion of a primordial black hole. I will explain how one can explore these un likely tails using semiclassical methods.\n\nFor zoom link please email: mk nouse@umd.edu LAST-MODIFIED:20210423T163414Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T203000Z DTEND:20221116T223000Z DTSTAMP:20260828T094430Z UID:4473v9o51jdo13tfhg97o0o6tp@google.com CREATED:20220815T131400Z DESCRIPTION:Speaker: TBA

    Title: TBA

    Abstract: < b>TBA     LAST-MODIFIED:20220815T131400Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211015T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211007T140000 DTSTAMP:20260828T094430Z UID:2n7gfg0fjrtujinjjludroip31@google.com CREATED:20210924T121251Z DESCRIPTION:Title: TBA\nAbstract: TBA\n\n\nHost: Paglione\n \nNote: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121251Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Vlad Pribiag\, University of Minnesota TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T170000Z DTEND:20220202T180000Z DTSTAMP:20260828T094430Z UID:1abmmd2rmlnm6hsns7oeti6qvj@google.com CREATED:20220125T140858Z DESCRIPTION:Speaker: Amit Agrawal\, Visiting Fellow and Associat e Research Scientist\, IREAP/NIST

    Title: Novel Nanophotonic Interfac es to Quantum Systems: Material Challenges and Opportunities

    Abstrac t: \;    Over the last decade\, flat optical elements composed of an array of deep-subwavelength dielectric or metallic nanostructures of nanoscale thicknesses – referred to as metasurfaces – have revolutionized t he field of optics. Because of their ability to impart an arbitrary phase\, polarization or amplitude modulation to an optical wavefront as well as pe rform multiple optical transformations simultaneously on the incoming light \, they promise to replace traditional bulk optics in applications requirin g compactness\, integration and/or multiplexing. Recent demonstrations incl uding imaging\, polarimetry\, quantum-light generation and LIDAR demonstrat e the range of technologies where metasurfaces have already had a significa nt impact. In this talk\, we first demonstrate the versatility of metasurfa ces as a compact\, efficient and multifunctional interface to trap atoms fo r application in quantum information science and atomic clocks. In another integration step\, combining metasurfaces with integrated photonic circuits promises increased complexity and functionality in a batch-fabricated opti cal microsystem. Finally\, we will discuss material and photonic-loss chall enges that must be overcome for successful realization of a fully integrate d quantum system based on cold atoms or solid-state qubits.


    Biography :

    Amit Agrawal is a project leader at NIST in Gaithersburg\, MD\, an d an Associate Research Scientist at the IREAP of the University of Marylan d\, College Park. He received his Ph.D. in Electrical Engineering from the University of Utah in 2008\, followed by a Postdoc at NIST/UMD. He then joi ned the faculty of Syracuse University in 2011\, as the John E. and Patrici a Breyer Professor of Electrical Engineering. He has been back at NIST/UMD since 2014\, where his group is developing novel nanophotonic devices\, ope rating from the near-infrared to deep-ultraviolet frequencies\, for providi ng arbitrary control over the linear and nonlinear properties of light in s pace and in time. His current work is focused on developing functional inte grated nanophotonic systems for applications ranging from imaging to quantu m-optics.

    LAST-MODIFIED:20220127T160546Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T150000Z DTEND:20220427T160000Z DTSTAMP:20260828T094430Z UID:1bd0a63n1fbqir704hd3icrgsj@google.com CREATED:20220207T164018Z DESCRIPTION:Speaker: Professor Mark Johnson\, Yale University - \;https://jlab.chem .yale.edu/

    Title: Unraveling the Spectral Dynamics of the Air-Wa ter Interface at the Molecular Level with Cryogenic Ion Spectroscopy

    Abstract: \;The coupling between ambient ionizati on sources\, developed for mass
    spectrometric analysis of biomolecules\, and cryogenic ion processing\, originally
    designed to study interstella r chemistry\, creates a new and general way to capture
    transient chemica l species and elucidate their structures with optical

    spectroscopies . Advances in non-linear optics over the past decade allow single-
    inves tigator\, table top lasers to access radiation from 550 cm-1 in the infrare d to the

    vacuum ultraviolet. When spectra are acquired using prediss ociation of weakly
    bound rare gas “tags\,” the resulting patterns are di rectly equivalent to absorption
    spectra of target ions at temperatures b elow 10 K\, and quenched close to their
    global minimum energy geometries . Taken together\, what emerges is a new and
    powerful structural capabil ity that augments the traditional tools available in high
    resolution mas s spectrometry. Currently\, these methods are being exploited to
    monitor chemical and physical processes in assemblies with well-defined
    tempera tures and compositions. Recent applications\, ranging from the mechanismsof small molecule activation by homogeneous catalysts to the microscopic< br>mechanics underlying the ultrafast spectral diffusion in water\, emphasi ze the
    generality and utility of the methods in contemporary chemistry.< /html-blob> LAST-MODIFIED:20220421T133640Z LOCATION:On Zoom! go.umd.edu/pchem-Johnson SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220512T190000Z DTEND:20220512T203000Z DTSTAMP:20260828T094430Z UID:1r2c6ruq5bnit5fo39ukr7cvm3@google.com CREATED:20220422T171808Z DESCRIPTION:
    Title: Quantum Algorithms for Simulation and Sp ectroscopy of Nuclear Physics
    Abstract: In t his talk I will discuss ongoing progress in two projects. The first project is related to implementing the time-evolution operator corresponding to th e Kogut-Susskind formulation of Lattice Gauge Theories (U(1)\, SU(2)\, and SU(3))\, and an improvement thereof called the Loop-String-Hadron formulati on. We give a simple\, generic method of decomposing a Hamiltonian into a m inimal sum of easily-diagonalizable summands\, suitable to plug into Trotte r- or Block-Encoding-based Hamiltonian simulation methods. For the SU(3) fe rmion-gauge interaction term\, our method decreases the complexity by a fac tor of ~1/500 over prior art. I will also discuss major obstacles in giving feasible algorithms for quantum simulations of Lattice Gauge Theories\, wh ich I hope to address over the course of my PhD. \; The second project is about understanding how we could use quantum computers to learn excited eigenvalues of lattice nuclear theories. I will compare textbook phase esti mation to recently-developed block-encoding-based methods\, applied to a Ch iral Effective Field Theory Hamiltonian. LAST-MODIFIED:20220505T174517Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Alexander Shaw Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210428T200000Z DTEND:20210428T213000Z DTSTAMP:20260828T094430Z UID:6m9q2227j4i54e69925cbhshn3@google.com CREATED:20210423T115020Z DESCRIPTION:Speaker: Zhen Liu\, University of Minnesota \nWhere: Online at: https://umd.zoom.us/j/96004266225\n\nAbstract:\nMomentum has been accumula ting to consider high energy muon collider as a future high energy collider possibility\, especially on the US soil. Muon collider has unique physics cases\, both as a Higgs factory as well as a high energy lepton collider. I n this talk\, I will highlight the physics opportunities for a muon collide r in probing beyond-the-Standard Model phenomena including dark matter\, na turalness\, and the origins of electroweak symmetry breaking LAST-MODIFIED:20210423T115020Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP/Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T180000Z DTEND:20220222T191500Z DTSTAMP:20260828T094430Z UID:2137ip4b3fmc6bhghk6ivjqgpr@google.com CREATED:20220207T154018Z DESCRIPTION:Speaker: Dr. Christopher Moakler\, UMD\n\nTitle: the Hydra Stri ng Method ad its Application to High Dimensional Potential Energy Surfaces Arising from Granular Systems\n\nAbstract: Granular materials are a ubiquit ous yet ill-understood class of media. Different approaches and techniques have been developed to understand the many complex behaviors they exhibit\, but none have been completely successful. I have instituted a novel means to understand granular materials. This novel method\, the Hydra String Meth od (HSM)\, is an efficient and autonomous way to trawl the potential energy surfaces (PESs) to enumerate the saddles\, minima\, and connections betwee n them. I have applied the Hydra String Method to bi-disperse configuration s of soft spheres to map out ensembles of pathways between stable packings of the system. These transition pathways are a low-dimensional projection o f the larger PES. By understanding these pathways and how they connect to o ne another may allow for the prediction of the dynamics of a granular syste m as it moves between stable packings. LAST-MODIFIED:20220217T141433Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201006T160000 DTEND;TZID=America/New_York:20201006T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201006T160000 CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211119T170000Z DTEND:20211119T174500Z DTSTAMP:20260828T094430Z UID:1i8ee7qtb6olb5n0iakcdpss30@google.com CREATED:20211112T163742Z DESCRIPTION:Title: FQS Industry talk- Leidos\nSpeaker: Allyson O'Brien (Le idos)\nTime: Friday\, November 19\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn this special Frid ay Quantum Seminar\, Dr. Allyson O'Brien\, a Quantum Technology Scientist a t Leidos\, will share stories from her career path and a broader perspectiv e on the field.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211112T163742Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Allyson O'Brien TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T190000Z DTEND:20220328T203000Z DTSTAMP:20260828T094430Z UID:52e1dqjmeblrvjj2ojcbgc0bb5@google.com CREATED:20220118T144118Z DESCRIPTION:Speaker: Martin Schmaltz\, Boston University
    Title: \;"A Step in Understanding the Hubble Tension"
    Abstract: \;This talks begins wi th a review of the tension between the locally measured Hubble constant&nbs p\;H0 \;and the value inferred from the CMB. A soluti on to the tension may be provided by models with interacting dark radiation that distinguish between high- and low-ℓ \;multipoles. The requ ired "step" in dark radiation can be generated if the dark radiation contai ns both massive and massless particles. When the temperature of the radiati on drops below their mass the massive particles annihilate and transfer the ir entropy to the massless radiation\, thereby increasing the total relativ e energy density. If this transition occurs while CMB-observable modes are inside the horizon\, high- and low-ℓ \;peaks are impacted differ ently\, corresponding to modes that enter the horizon before or after the s tep. These dynamics are naturally packaged into the simplest supersymmetric theory\, the Wess-Zumino model\, with the mass of the scalar near the eV-s cale. We investigate the cosmological signatures of such "Wess-Zumino Dark Radiation" (WZDR) and find that it provides an improved fit to the CMB alon e\, favoring larger values of \;H0. If supernovae mea surements from the SH0ES collaboration are also included in the analysis\, the inferred value of \;H0 \;is yet larger\, but the preference for dark radiation and the location of the transition is lef t nearly unchanged. I conclude by comparing our model to the competition an d outline planned extensions of this work.
    Seminar will also be live streamed via zoom\, for zoom link please email mknouse@umd.edu LAST-MODIFIED:20220324T182244Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T193000Z DTEND:20210909T203000Z DTSTAMP:20260828T094430Z UID:6ro15812sf0hsvc9u23toogakj@google.com CREATED:20210903T131959Z DESCRIPTION:Title : An introduction to the Sachdev-Ye-Kitaev model
    Speaker Name: Mike Winer

    Speaker Institution : University of M aryland

    Abstract: This will be an introduction to the SYK (Sachdev-Y e-Kitaev) model. Recommended reference: the first section or two of Juan Ma ldacena and Douglas Stanford\, Comments on the Sachdev-Ye-Kitaev model\, Ph ys. Rev. D 94\, 106002 (2016)\, arXiv:1604.07818

    Host: Jonathan Rose nberg
    Host E-Mail: \;jmr@umd.edu LAST-MODIFIED:20210903T131959Z LOCATION:Kirwan Hall 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMNS - Mathematics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211012T160000 DTEND;TZID=America/New_York:20211012T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211012T160000 CREATED:20200116T204737Z DESCRIPTION:
    Sharon Glotzer\, University of Michigan  \;
    Paint Branch Lecture Seri es
    To be held in 1101 A. James C lark Hall \;
     \;
    < span>Order\, disorder and the entropic bond: The Truth About Entropy


    Entropy is typically associated with disorder\; ye t\, the counterintuitive notion that particles with no interactions other t han excluded volume might self-assemble from a fluid phase into an ordered crystal has been known since the mid-20th century. First predicted for rods \, and then spheres\, the thermodynamic ordering of hard particle shapes by nothing more than crowding is now well established. In recent years\, surp rising discoveries of entropically ordered colloidal crystals of extraordin ary structural complexity have been predicted by computer simulation and ob served in the laboratory. Colloidal quasicrystals\, clathrate structures\, and structures with large and complex unit cells typically associated with metal alloys can all self-assemble from disordered phases of identical nano particles due solely to entropy maximization. In this talk\, we show how en tropy alone can produce order and complexity beyond that previously imagine d. \; We introduce the notion of the \;entropic bond\, and show how methods used by the quantum community to predict atomic crystal structures can be used to predict entropic colloidal crystals.



    https://ireap.u md.edu/




     LAST-MODIFIED:20220120T142431Z LOCATION: 8278 Paint Branch Dr\, College Park\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium/Paint Branch Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220318T173000Z DTEND:20220318T183000Z DTSTAMP:20260828T094430Z UID:7bspugrg75rsrvbbh15a32433r@google.com CREATED:20220303T154541Z DESCRIPTION:

    Alex Pomarol\, University of B arcelona *Special Seminar*

    Will be preceded by virtual lunch at 12:3 0pm

    Title: Small instantons and the axion mass

    Abstract: I wi ll discuss the sensitivity of the axion mass on UV modifications of QCD. In particular\, I will consider contributions from small instantons to the ax ion mass in the case in which gluons propagate in some extra dimension at h igh energies. In the case of a d=5 AdS space\, this is expected to be simil ar to QCD interacting with an additional  \;(strongly-coupled) colored sector. Contrary to expectations\, I will show that small instantons are su ppressed\, and only UV localized instanton-anti-instanton contributions can be sizeable. For flat extra dimensions\, I will show that small instantons can be enhanced by power-law corrections due to the presence of the Kaluza -Klein states.

    Seminar will be conducted via zoom\, for link please email: mknouse@umd.edu LAST-MODIFIED:20220309T165929Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Special Joint Cornell/ UMD Seminar** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220520T180000Z DTEND:20220520T200000Z DTSTAMP:20260828T094430Z UID:0ern6o1d05trsqr7rut8jleebp@google.com CREATED:20220505T162637Z DESCRIPTION:Title: Quantum algorithms and the power of forgetting\nSpeaker : Amin Shiraz Gilani (QuICS)\nTime: Friday\, May 20\, 2022 - 2:00pm\nLoca tion: ATL 3100A\n\nThe so-called Welded Tree Problem provides an example o f a black-box problem that can be solved exponentially faster by a quantum walk than by any classical algorithm (https://arxiv.org/pdf/quant-ph/0209131.pdf). Given the name of a special ENTRANCE vertex\, a quantum walk can find another distinguished EXI T vertex using polynomially many queries\, though without finding any parti cular path from ENTRANCE to EXIT. It has been an open problem for twenty ye ars whether there is an efficient quantum algorithm for finding such a path \, or if the path-finding problem is hard even for quantum computers. We sh ow that a natural class of efficient quantum algorithms provably cannot fin d a path from ENTRANCE to EXIT in the Welded Tree Problem. Specifically\, w e consider algorithms that\, within each branch of their superposition\, al ways store a set of vertex labels that form a connected subgraph including the ENTRANCE\, and that only provide these vertex labels as inputs to the o racle. While this does not rule out the possibility of a quantum algorithm that efficiently finds a path\, it is hard to imagine how an algorithm coul d benefit by deviating from this behavior. Our no-go result suggests that\, to outperform classical computation\, quantum algorithms must necessarily forget the path they take to reach a solution. LAST-MODIFIED:20220505T162637Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Master's Thesis Defense: Amin Shiraz Gilani TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T150000Z DTEND:20220330T160000Z DTSTAMP:20260828T094430Z UID:49a7r3jirjm9ebd6n3h7lqjbf9@google.com CREATED:20220207T163547Z DESCRIPTION:Speaker: Pierce Edward Van Mulbregt\, Mullin Group

    Title: \;Dynamics of Rotationally and Vibrationally Excite d Molecules

    Abstract: TBA - \;https://chem.umd.e du/events/literature-seminar-pierce-edward-van-mulbregt LAST-MODIFIED:20220323T215623Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221122T160000Z DTEND:20221122T170000Z DTSTAMP:20260828T094430Z UID:5k0apk8lhu5j3p11kkdilq13dd@google.com CREATED:20220815T165312Z DESCRIPTION:Literature Seminar: Bryan Wentz\, UMCP\n\nTitle: TBA LAST-MODIFIED:20220815T165312Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210402T180000Z DTEND:20210402T193000Z DTSTAMP:20260828T094430Z UID:1fi9vn5r19jj5nummm4af2qnbf@google.com CREATED:20210125T153328Z DESCRIPTION:Seminar will be conducted via zoom: \; \;https:// umd.zoom.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT0 9

    Speaker: Alba Cervera Lierta\, University of Toronto

    Ti tle: Maximal Entanglement in High Energy Physics

    Abstract:
    We ana lyze how maximal entanglement is generated at the fundamental level in QED by studying correlations between helicity states in tree-level scattering p rocesses at high energy. We demonstrate that two mechanisms for the generat ion of maximal entanglement are at work: i) s-channel processes where the v irtual photon carries equal overlaps of the helicities of the final state p articles\, and ii) the indistinguishable superposition between t- and u-cha nnels. We then study whether requiring maximal entanglement constrains the coupling structure of QED and the weak interactions. In the case of photon- electron interactions unconstrained by gauge symmetry\, we show how this re quirement allows reproducing QED. For Z-mediated weak scattering\, the maxi mal entanglement principle leads to non-trivial predictions for the value o f the weak mixing angle θW. Our results are a first step towards understand ing the connections between maximal entanglement and the fundamental symmet ries of high-energy physics. LAST-MODIFIED:20210329T133651Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T200000Z DTEND:20211104T213000Z DTSTAMP:20260828T094430Z UID:76ev7inn2m79ml41pqbl7ggtf9@google.com CREATED:20211103T173430Z DESCRIPTION:Title : "A Ghost Hunt: Search for Dark Matter via Ground-based Experiments"

    Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : University of Maryland

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211103T173430Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210216T181500Z DTEND:20210216T191500Z DTSTAMP:20260828T094430Z UID:1ofp7k27lk223prutpok74pndo@google.com CREATED:20210202T175237Z DESCRIPTION:Speaker: Dr. Sergei Kalinin\, Oak Ridge National Laboratory

    Title: Physical Discovery by Machine Learning: from Symmetries and Ch emical Relations to Generative and Causal Models

    Abstract: Machine l earning has emerged as a powerful tool for the analysis of mesoscopic and a tomically resolved images and spectroscopy in electron and scanning probe m icroscopy. The applications ranging from feature extraction to information compression and elucidation of relevant order parameters to inversion of im aging data to reconstruct structural models have been demonstrated. In this presentation\, I will discuss several opportunities for ML applications in imaging sciences\, starting with the probabilistic correlative models to s tochastic and physical generative models and subsequently to causal models. First\, several applications of autoencoders and variational autoencoders for the analysis of image and spectral data in STEM and SPM. The special em phasis is made on the rotationally invariant variational autoencoders that allow to disentangle rotational degrees of freedom from other latent variab les in imaging and spectral data. The analysis of the latent space of autoe ncoders further allows establishing physically relevant transformation mech anisms. Extension of encoder approach towards establishing structure-proper ty relationships will be illustrated on the example of ferroelectric domain walls and plasmonic structures. I will further illustrate the applications of the Bayesian inference methods towards inferring the mesoscopic and ato mistic physics of materials in terms of continuous and atomistic generative models\, and illustrate the pathways towards incorporation of physical mod els as priors within Bayesian optimization towards effective sampling of ex perimental parameter spaces. Ultimately\, we seek to answer the causal ques tions such as whether frozen atomic disorder drives the emergence of the lo cal structural distortions or average shift of the Fermi level induces stru ctural reconstruction that in turn drive cation distribution\, whether the nucleation spot of phase transition can be predicted based on observations before the transition\, and what is the driving forces controlling the emer gence of unique functionalities in quantum materials.

    Below is th e ZOOM seminar link.

    ZOOM: \;https://go.umd.edu/statphys_spring2021

    LAST-MODIFIED:20210202T175338Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T150000Z DTEND:20220328T160000Z DTSTAMP:20260828T094430Z UID:3gpkruvbo5v9maoa4inkkpav53@google.com CREATED:20220121T183501Z DESCRIPTION:Speaker: Ken Brown\, Duke University

    Title:& nbsp\;Quantum Error Correction Now!

    Abstract: \;Quantum computer s have finally reached a level of complexity where real-time quantum error correction is possible. Current systems have shown an advantage using encod ed qubits for some experiments\, but no experiment has shown a decisive vic tory of encoded qubits over physical qubits. I will review the current stat e-of-the-art and then provide some lessons learned from adapting fault-tole rant quantum circuits to ion trap hardware. I will focus on the interplay o f physical noise with the quantum error correction code and discuss ways to take advantage of the noise structure through subspace selection\,
    synd rome extraction methods\, and improved decoders.

    Host: Joe Britton LAST-MODIFIED:20220317T195433Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220913T150000Z DTEND:20220913T160000Z DTSTAMP:20260828T094430Z UID:4int4d3sjoqeeqpqds4iv5a2pl@google.com CREATED:20220815T164300Z DESCRIPTION:Speaker: Dr. Luigi Alvarado\, 10x Genomics\n\nTitle: Career Tra jectory: Snippets of Work from My Time at UMD (Dayie's Lab)\, Hematology Po st-doc\, R&D in Biotech\, and Now a Manager for Oncology at 10x Genomics' C ommercial Organization LAST-MODIFIED:20220815T164300Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210727T200000Z DTEND:20210727T210000Z DTSTAMP:20260828T094430Z UID:3o9d9ibkj7rdutnvnjm7qj3ueg@google.com CREATED:20210721T143336Z DESCRIPTION:Title: Lower Bounds on Stabilizer Rank\nSpeaker: Dr. Ben Lee V olk (The University of Texas at Austin)\nTime: Tuesday\, July 27\, 2021 - 4:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/9928664912 6?pwd=Zml0UjBQMzBCVWZlUGlqTDJkMzlIQT09\n\nThe stabilizer rank of a quantum state ψ is the minimal integer r such that ψ can be written as a linear com bination of r stabilizer states. The running time of several classical simu lation methods for quantum circuits is determined by the stabilizer rank of the n-th tensor power of single-qubit magic states. In this talk we'll pre sent a recent improved lower bound of Ω(n) on the stabilizer rank of such s tates\, and an Ω(sqrt{n}/log n) lower bound on the rank of any state which approximates them to a high enough accuracy. Our techniques rely on the rep resentation of stabilizer states as quadratic functions over affine subspac es of the boolean cube\, along with some tools from computational complexit y theory. \n\n Reference: Peleg\, Shir\, Amir Shpilka\, and Ben Lee Volk. " Lower Bounds on Stabilizer Rank." arXiv preprint arXiv:2106.03214 (2021). \ n\nThis talk is part of the IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210721T143336Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Dr. Ben Lee Volk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211126T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211111T140000 DTSTAMP:20260828T094430Z UID:757643anvruokbd5bj2p1rc17a@google.com CREATED:20210924T122633Z LAST-MODIFIED:20210924T122633Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220314T190000Z DTEND:20220314T203000Z DTSTAMP:20260828T094430Z UID:2te6n0tij7d00f8iomh5blm9hq@google.com CREATED:20220124T160119Z DESCRIPTION:Speaker: Ken Van Tilburg\, NYU/CCA

    Title: Ste llar Basins

    Abstract: I will describe the phenomenology of stellar b asins: volumetric stellar emission into gravitationally bound orbits of wea kly coupled particles such as axions\, moduli\, hidden photons\, and fermio ns. While only a tiny fraction of the instantaneous luminosity of a star (t he vast majority of the emission is into relativistic modes)\, the continua l injection of these particles into a small part of phase space causes them to accumulate over astrophysically long time scales\, forming a "stellar b asin"\, in analogy with the geologic kind. The energy density of the Solar basin can surpass that of the relativistic Solar flux at Earth's location a fter only a million years\, for a sufficiently long-lived particle produced through an emission process whose matrix elements are unsuppressed at low momentum. I will also discuss ongoing N-body simulations of the Solar basin \, and preliminary results on both indirect detection and recasted direct d etection searches for basin particles around the Sun.

    Seminar will a lso be streamed live via zoom\, for zoom link please email mknouse@umd.edu< /html-blob>

     LAST-MODIFIED:20220310T153019Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210212T180000Z DTEND:20210212T190000Z DTSTAMP:20260828T094430Z UID:582879hckka8g2hik9s37kmsbc@google.com CREATED:20210202T134213Z DESCRIPTION:Speaker: Karthish Manthiram\, T.T. Miller Career Development Ch air &\; Assistant Professor\, Chemical Engineering Massachusetts Institu te of Technology

    Title: Controlling Interfacial Electron and Atom Tr ansfer Reactions for Chemical Synthesis

    Abstract: Chemical synthesis is responsible for significant emissions of carbon dioxide worldwide. Thes e emissions arise not only due to the energy requirements of chemical synth esis\, but since hydrocarbon feedstocks can be overoxidized or used as hydr ogen sources. Using renewable electricity to drive chemical synthesis may p rovide a route to overcoming these challenges\, enabling synthetic routes w hich operate at benign conditions and utilize sustainable inputs. We are de veloping an electrosynthetic toolkit in which distributed feedstocks\, incl uding carbon dioxide\, dinitrogen\, water\, and renewable electricity\, can be converted into diverse fuels\, chemicals\, and materials.
    In this pr esentation\, we will first share recent advances made in our laboratory on nitrogen fixation to synthesize ammonia at ambient conditions. Specifically \, our lab has investigated a continuous lithium-mediated approach to ammon ia synthesis and understood the reaction network that controls selectivity. We have developed non-aqueous gas-diffusion electrodes which lead to high rates of ammonia synthesis at ambient conditions. Then\, we will discuss ho w water can be used as a sustainable oxygen-atom source for epoxidation of olefins as well as related oxygen­atom transfer reactions\, providing a rou te to utilize oxidative equivalents in a water electrolyzer. These findings will be discussed in the context of a broader range of electrosynthetic tr ansformations which could lead to local and on-demand production of critica l chemicals and materials.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \;&nbs p\; LAST-MODIFIED:20210202T135338Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T180000Z DTEND:20220329T190000Z DTSTAMP:20260828T094430Z UID:6tu0m236ut9de8n1vsa53be4u2@google.com CREATED:20220324T151710Z DESCRIPTION:

    Speaker: Andrey Gromov

    Where: ATL4402

    Title: Applied Fractons


    Abstract    : Fractons are a class of quasiparticles that can not freely propagate through space. They were first introduced in a model o f quantum (almost) self-correcting memory. Later it became clear that fract ons\, as well as\, adjacent ideas such as tensor gauge theories and multipo le or subsystem conservation laws provide a language to describe some known and some new phenomena. In this talk I will explain what fractons are\, wh at kind of systems are known to support them and what kind of problems they will help to elucidate in the future.

    Host: Dr. Jay Sau

     LAST-MODIFIED:20220325T210140Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T150000Z DTEND:20220413T160000Z DTSTAMP:20260828T094430Z UID:27d2cgjg6skt23g2942crqj3nn@google.com CREATED:20220207T163915Z DESCRIPTION:Speaker: Dr. David Long\, NIST - \ ;https://www.nist.gov/peop le/david-long

    Title: New Approaches to Optical Spectroscopy: Fro m Satellites to Combs to Microsensors

    Abstract: \; I will discuss our recent work towards novel methods for optical spectrosco py. These efforts include a variety ultrasensitive\, cavity-enhanced method s in support of global greenhouse gas remote sensing. In addition\, I will discuss approaches for the generation of optical frequency combs and their use in a wide range of applications including molecular and atomic spectros copy as well as physical metrology. Finally\, I will describe the use of th ese combs to interrogate optomechanical sensors for high accuracy\, chip-sc ale accelerometry.
     LAST-MODIFIED:20220407T135513Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T110000 DTEND;TZID=America/New_York:20210830T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210830T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Pedram Roushan\, Google LLC

    Title: Experiments on superconducting processors at the dawn of NISQ era

    Abstract: The recent successful computation beyond the capability of classical computers has brought considerable attention to the Noisy Intermediate Scale Quantum (NISQ) processors. The \;only \;way to evaluate the promise of NISQ devices is to implement algorithms on them that are of interest to the scientific community. In this talk\, I will present two of such exampl es based on our recent works on \;time crystals \;and the \;Kitaev toric code \;[1\,2]. \; The first work is on study phase transitions\, which is challenge due to limited programmabilit y\, finite coherence time\, and finite size of NISQ hardware. With addressi ng these issues\, we provide a set of experimental benchmarks and establish a scalable approach to study phases of matter on current quantum processor s. \; \;The theme of the second work is in studying topological sta tes. The discovery of topological order has revolutionized the understandin g of quantum matter in modern physics and provided the theoretical foundati on for many quantum error correcting codes. Realizing topologically ordered states has proven to be extremely challenging in both condensed matter and synthetic quantum systems. Here\, we prepare the ground state of the toric code Hamiltonian using an efficient quantum circuit. Our results demonstra te the potential of NISQ processors to provide key insights into topologica l quantum matter and quantum error correction.

    [1] \;https://arxiv.org/abs/2107.13571

    [2] \;https://arxiv.org/abs/2104.01180


    Host: Maissam Bark eshli/ Alicia Kollar LAST-MODIFIED:20220617T080639Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T180000Z DTEND:20220414T193000Z DTSTAMP:20260828T094430Z UID:6cjrmaflfjob6jpv7cpkj6q841@google.com CREATED:20220225T152014Z DESCRIPTION:

    Title Atomic semiconductor via flat phonon ban ds in HfO2

    Abstract: Flat energy bands in the momentum space of electrons were known to generate spatially localized states and p roduce unconventional phenomena such as graphene superconductivity. However \, flat bands in a phonon had not been discovered yet. We were the first to discover that they exist in a ferroelectric HfO2 \;and prod uce localized polar displacement of individual atomic layers [1]. Strikingl y\, this atomic layer is freely displaced by external voltage for the dense st information storage. Our theory of atom control directly in solid [1] is applicable to the Si-compatible HfO2\, so can be materialized i n most electronic devices reaching up to ~100 TB memories.

     \ ;[1] “Scale-free ferroelectricity driven by flat phonon bands in HfO2< /sub>”\, H.-J. Lee et al.\, Science \;369\, 1343 (2020).


    Host: Takeuchi
     \;
    Location: Toll Physics Rm 1201

    Seminar also on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/913 01075848

     LAST-MODIFIED:20220405T130346Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC Colloquium: Jun Hee Lee\, Ulsan National Institute of Science a nd Technology(UNIST) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211006T190000Z DTEND:20211006T200000Z DTSTAMP:20260828T094430Z UID:3jb2rugmobjoofvo6n65gejma6@google.com CREATED:20210907T150025Z DESCRIPTION:*Joint Gravity &\; Particle Theory Seminar*

    Also will be streamed by zoom: \;https:// umd.zoom.us/j/562421853

    Speaker: Ira Rothstein\, Carnegie Mellon University

    Title:
    A Generic Class of Field Theories that Appe ar to be Finely Tuned

    Abstract:
    The Wilsonian paradigm asserts t hat hierarchies imply the existence of new UV physics to maintain naturalne ss. However\, we know that this strong imperative can be avoided by allowin g for the ground state to evolve\, as in Abbotts' proposal to solve the cos mological constant problem. Recently there have been similar proposals to s olve the electro-weak hierarchy problem via a relaxation mechanism\, which however depend upon specific cosmological evolution including a ``trigger mechanism” that halts the evolution. In this talk I will show that there i s a class of effective field theories which have hidden relaxation mechanis ms\, and avoid the need for any cosmological model building\, when the ta rget space is compact. LAST-MODIFIED:20211004T135212Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Gravity and Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T150000Z DTEND:20220421T160000Z DTSTAMP:20260828T094430Z UID:76miu1n0vl1utgtlsb8kt0n59q@google.com CREATED:20220207T180723Z DESCRIPTION:Speaker: Dr. Nicole L. Snyder\, Davidson College

    Title: Humans vs Microbes

    Abstract: \;https://che m.umd.edu/events/humans-vs-microbes     LAST-MODIFIED:20220411T140044Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221020T150000Z DTEND:20221020T160000Z DTSTAMP:20260828T094430Z UID:70m2lpt4qi8iim33m3cv133sqi@google.com CREATED:20220804T154711Z DESCRIPTION:Literature Seminar\n\nSpeaker: Min Chieh (Jack) Yang\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T154711Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211019T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20211004T160000 DTSTAMP:20260828T094430Z UID:6cac7bc7fc6lnjtierpbjsgtn5@google.com CREATED:20210924T113733Z DESCRIPTION:Speaker 1: Prathum Saraf
    Speaker 2: Danila Sokratov


     
    Advisor:  Johnpierre Pa glione

    Title: TBD


    Abstract: TBD

    Note: there will NOT be rec eptions prior to the talk until further notice. LAST-MODIFIED:20210924T113733Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf/Danila Sokratov TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220124T144500Z DTEND:20220124T153000Z DTSTAMP:20260828T094430Z UID:6cdrhfhgcfjlj9uidhj7a5r04i@google.com CREATED:20220121T184145Z DESCRIPTION:Speaker: Lin Xin\, Georgia Institute of Techn ology

    Title: Squeezed Ground States in a Spin-1 Bose-Einstein Conden sate

    Abstract: We find a fast non-adiabatic protocol for the creatio n of spin squeezed ground states in a spin-1 Bose condensate and experiment ally generate those states near the quantum critical point between the pola r and ferromagnetic quantum phases of the interacting spin ensemble. The me thod consists of a pair of controlled quenches of an external magnetic fiel d\, which has the same leading order dependence for the total time as the q uantum optimal control method but is simpler and realizable. In contrast to typical non-equilibrium methods for preparing atomic squeezed states by qu enching through a quantum phase transition\, squeezed ground states are tim e-stationary and remain squeezed for the lifetime of the condensate. A sque ezed ground state with a metrological improvement up to 6-8 dB and a consta nt squeezing angle maintained over 2s is demonstrated.

    Biography: Li n Xin is a graduate student at Georgia Tech\, School of Physics\, working i n Prof. Michael Chapman's Bose-Einstein condensation (BEC) laboratory. His research focuses on many-body interaction in ultracold atoms. He received h is B.S. in physics with the highest honors from Shanghai Jiaotong Universit y in 2016\, where he worked on theoretical ultrafast AMO physics.

    Ho st: Ian Spielman \;

    Online: \;https://umd.zoom.us/j/7984811536     LAST-MODIFIED:20220121T184223Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220404T160000 DTEND;TZID=America/New_York:20220404T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220404T160000 CREATED:20220131T204640Z DESCRIPTION:

    STM studies of the heavy fermion \;superconductor UTe 2 \;  \; \;


    V idya Madhavan
    University of Illinois\, Urbana Champaign

    Spin-triplet s uperconductivity is a condensate of electron pairs with spin-1 and an odd-p arity wavefunction. A particularly interesting manifestation of triplet pai ring is a chiral p-wave state which is topologically non-trivial and a natu ral platform for realizing Majorana edge modes. Triplet pairing is however rare in solid state systems. The best-known example of chiral spin-triplet paring is the superfluid 3He-A phase and over the last few decad es\, there has been an intensive search for potential spin-triplet supercon ductors in solid-state systems. Since pairing is most naturally mediated by ferromagnetic spin fluctuations\, uranium based heavy fermion systems cont aining f-electron elements that can harbor both strong correlations and magnetism are considered ideal candidate spin-triplet superconductors. In this work I will present scanning tunneling microscopy(STM) data on the newly discovered heavy fermion superconductor\, UTe2with a T< /i>SC of 1.6 K. I will show signatures of coexisting Kondo effec t and superconductivity which show competing spatial modulations within one unit-cell. \; STM spectroscopy at step edges show signatures of chiral in-gap states\, predicted to exist at the boundaries of a topological supe rconductor. Finally\, I will discuss signatures of other co-existing phases in this complex superconductor. \;

    In-Person Location: Toll Physics Room # 1201
    Time: 4pm -6pm LAST-MODIFIED:20220401T184019Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838c: SPECIAL SEMINAR by Vidya Madhavan\, UIUC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210830T190000Z DTEND:20210830T203000Z DTSTAMP:20260828T094430Z UID:5r2j4oq9aol6nmltd4olvb8jh4@google.com CREATED:20210826T121718Z DESCRIPTION:Speaker: Michael Fedderke\, JHU\n\nTitle: Bridging the microher tz gap with asteroids: opportunities and challenges for gravitational wave detection\n\nAbstract: The science case for a broad program of gravitationa l wave (GW) detection across all frequency bands is exceptionally strong. A t present\, there is a dearth of coverage by existing and proposed searches in the GW frequency band lying between the peak sensitivities of PTAs and LISA\, roughly 0.1-100 microhertz. In this talk\, I will outline a conceptu al mission proposal to access this band. I will demonstrate that a few care fully chosen asteroids which orbit in the inner Solar System can act as exc ellent naturally occurring gravitational test masses despite the environmen tal noise sources. As such\, a GW detector can be constructed by ranging be tween these asteroids using optical or radio links. At low frequencies\, I will discuss how gravity gradient noise arising from the combined motion of the other ~10^6 asteroids in the inner Solar System sharply cuts off the s ensitivity of this proposal. Sensitivity in the middle of this band is most ly limited by various solar perturbations to the asteroid test masses\, whi le the high-frequency sensitivity is limited by noise in the ranging link. The projected strain-sensitivity curve that I will present indicates signif icant potential reach in this frequency band for a mission of this type.\n\ nFor zoom link please email: mknouse@umd.edu LAST-MODIFIED:20210826T121718Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211108T200000Z DTEND:20211108T213000Z DTSTAMP:20260828T094430Z UID:5qp4b35rvj2ot2gee7on9a8k9v@google.com CREATED:20210811T152022Z DESCRIPTION:Speaker: Itay Bloch\, Tel Aviv University\n\nTitle: The NASDUCK collaboration: using quantum magnetometers to look for ultralight dark mat ter\n\n\nAbstract: When DM bosons have an ultra-light mass\, they can act a s a classical\, coherent field. In many cases\, and specifically in some AL P models\, this field has magnetic properties\, and it can therefore be mea sured by quantum magnetometers. The Noble and Alkali Spin Detectors for Ult ralight Coherent darK matter (NASDUCK) collaboration\, was formed last year in order to measure such DM. Recently\, the collaboration released its fir st results from the "NASDUCK-Floquet" experiment\, which looks for DM rough ly in the femto to pico eV mass range. The new experiment places the most s tringent terrestrial constraints to date on ultra-light axion-like particle s coupled to neutrons. The constraints are comparable to those from stellar cooling\, providing a complementary probe. In my talk I will discuss the t heory behind the NASDUCK-Floquet experiment. I will also discuss future pro spects of the NASDUCK collaboration\, and some of our planned experiments. LAST-MODIFIED:20211101T165919Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220228T160000 DTEND;TZID=America/New_York:20220228T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220228T160000 CREATED:20220131T204640Z DESCRIPTION:
    Title: Impact on transmon T1 \;due to electr ode layouts with different gaps \;

    Abstract: The relaxation time& nbsp\;T1 \;of superconducting qubits has increased by orders of magnitude over the last two decades. I will describe the fabrication an d the measurement of the relaxation time in Al/AlOx/Al transmons that have gap-engineered electrodes. In one device\, the junction electrod e (thinner first layer) was formed by deposition of nominally pure aluminum and the counter-electrode was formed by deposition of oxygen-doped aluminu m. Repeated measurements showed \;T1 \;that varied from 100 to 300 μs at 20 mK. Another transmon\, which had the electrode formed b y deposition of oxygen-doped aluminum and the counter-electrode formed by d eposition of nominally pure aluminum\, also showed fluctuating \;T 1 \;values\, with a maximum \;T1 \; over 200 μs and an average that was also somewhat less than that of the fir st device. In an attempt to improve the removal of quasiparticles from the high gap side\, we also made 3-layer gap-engineered transmons\, with the th ird layer being a pure Al (which gives a low gap) top layer that was intend ed to act as a trap for quasiparticles. These devices showed \; \;r elatively large T1\, but not as large as our previous devices. W e will discuss \; \;possible explanations for this behavior. \;

    This work was supported by the Maryland Quantum Materials Center\, t he Joint Quantum Institute\, and the Laboratory for Physical Sciences.

    < u>
    In-Person Location: Toll Physics Room # 1201
    Time: 4pm -5:30pm


    Zoom LInk:&nbs p\;https://umd.zoom.us/j/972 65681008 LAST-MODIFIED:20220223T210547Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Kungang Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210222T213000Z DTEND:20210222T223000Z DTSTAMP:20260828T094430Z UID:3ma17dmjbl7uh170n84jp4u1jk@google.com CREATED:20210115T215117Z DESCRIPTION:Title: Electron Acceleration during Macroscale Magnetic Reconne ction\n\nSpeaker: Harry Arnold\, Department of Physics\, University of Mary land\n\nAbstract: The first self-consistent simulations of electron acceler ation during magnetic reconnection in a macroscale system are presented. Co nsistent with solar flare observations the spectra of energetic electrons t ake the form of power-laws that extend more than two decades in energy. The drive mechanism for these nonthermal electrons is Fermi reflection in grow ing and merging magnetic flux ropes. A strong guide field is found to suppr ess the production of nonthermal electrons by weakening the Fermi drive mec hanism. For a weak guide field the total energy content of nonthermal elect rons dominates that of the hot thermal electrons even though their number d ensity remains small. Our results are benchmarked with the hard x-ray\, rad io and extreme ultra-violet (EUV) observations of the X8.2-class solar flar e on September 10\, 2017.\n\nVisit https://bit.ly/2PmJoT6 for access LAST-MODIFIED:20210219T174230Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T170000Z DTEND:20210910T180000Z DTSTAMP:20260828T094430Z UID:7131iishaekc6kmilajt4m4o0f@google.com CREATED:20210831T180737Z DESCRIPTION:Speaker: Anna C. Balazs\, Professor\, Chemical Engineering\, Un iversity of Pittsburgh\n\nTitle: Chemically Controlled Shape-Morphing of El astic Sheets\n\nAbstract: Two-dimensional responsive materials that change shape into complex three-dimensional structures are valuable for creating s ystems ranging from wearable electronics to soft robotics. Typically\, the final 3D structure is unique and predetermined through the materials’ proce ssing. Using theory and simulation\, we devise a distinctive approach for driving shape changes of 2D elastic sheets in fluid-filled microchambers. T he sheets are coated with catalyst to generate controllable fluid flows\, w hich transform the sheets into complex 3D shapes. A given shape can be achi eved by patterning the arrangement of the catalytic domains on the sheet an d introducing the appropriate reactant to initiate a specific catalytic rea ction. Moreover\, a single sheet that encompasses multiple catalytic domain s can be transformed into a variety of 3D shapes through the addition of on e or more reactants. Materials systems that morph on-demand into a variety of distinct structures can simplify manufacturing processes and broaden the utility of soft materials. LAST-MODIFIED:20210831T180737Z LOCATION:CHE 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220804T140000Z DTEND:20220804T150000Z DTSTAMP:20260828T094430Z UID:7lc6lrqt3tmfbhuftgs2lvrl8g@google.com CREATED:20220729T022748Z DESCRIPTION:Title: Strong converse bounds for compression of mixed states\ nSpeaker: Zahra Khanian (Technical University of Munich)\nTime: Thursday\ , August 4\, 2022 - 10:00am\nLocation: Virtual Via Zoom: https://uwate rloo.zoom.us/j/98435686246?pwd=YWlGZWRzSUNJMGpaVjRuWnFjRlo0Zz09\n\nThe optimal rates for compression of mixed states was found by Koashi and Imoto in 2001 for the blind case and by Horodecki and independently by Hayashi f or the visible case respectively in 2000 and 2006. However\, it was not kno wn so far whether the strong converse property holds for these compression problems. In this work\, we show that the strong converse holds for the bli nd compression scheme. For the visible scheme\, the strong converse holds u p to the continuity of the regularized Renyi entanglement of purification. LAST-MODIFIED:20220729T022748Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/98435686246?pwd=YWlG ZWRzSUNJMGpaVjRuWnFjRlo0Zz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Zahra Khanian TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210920T110000 DTEND;TZID=America/New_York:20210920T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210920T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Susanne Yelin\, Harvard University \n\nTitle: Quantum Optics and Applications with Cooperative 2D Arrays\nAbstract: The physics o f cooperative atoms/radiators in regular 2D arrays is dominated by two prop erties: first\, a strongly frequency-selective reflectivity and second\, th e ability to confine polariton modes cleanly on the surface. This makes suc h a system highly sensitive to and controllable by light fields. Applicatio ns of these systems include quantum information\, metrology\, and nonlinear single-photon techniques.\n\nHost: Alicia Kollar LAST-MODIFIED:20220617T080617Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220907T150000Z DTEND:20220907T160000Z DTSTAMP:20260828T094430Z UID:0c14dtsc93bitmsqdtb89lnil0@google.com CREATED:20220804T153657Z DESCRIPTION:Speaker: Dr. John Fourkas\, UMCP

    Title: New A pproaches for Characterizing Absorptive Nonlinearities \;

    Abstract: Multiphoton absorptio n is an important phenomenon in spectroscopy\, imaging\, nanofabrication\, and many other applications. However\, making an accurate measurement of th e number of photons involved in a multiphoton transition in all but the sim plest of systems can be quite challenging\, particularly when multiple orde rs of absorption or other photophysical effects are present. The traditiona l approach to this problem involves making a log-log plot of some observabl e as a function of the irradiance. This scheme is typically limited by dyna mic range and other issues. We have developed a new suite of techniques cal led 2-beam action (2-BA) spectroscopies that allow for the determination of the order(s) of absorption at a single value of an observable. I will disc uss some examples of how these methods are allowing us to elucidate the beh avior of systems with complex photochemistry and photophysics. I will also introduce the next generation of these methods\, laser light amplitude modu lation action (LLAMA) spectroscopies\, which simplify implementation substa ntially. \; \;
     LAST-MODIFIED:20220826T134945Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210406T171500Z DTEND:20210406T181500Z DTSTAMP:20260828T094430Z UID:0hna8k5gjnnbkt61tuinsaafk6@google.com CREATED:20210202T180243Z LAST-MODIFIED:20210322T143841Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210224T203000Z DTEND:20210224T213000Z DTSTAMP:20260828T094430Z UID:2l26m1p1b1n843v9bisal05t2c@google.com CREATED:20210212T175906Z DESCRIPTION:Topological Semimetal Thin Films
     \;
    Speaker Name: Professor Susanne Stemmer

    Speaker Institut ion : University of California\, Santa Barbara
     \;
    Abstract : Thi n films of topological semimetals offer new opportunities to control and ma nipulate unique electronic states and a wealth of associated phenomena\, fo r example\, via electric field effect\, strain\, or symmetry breaking. In this presentation\, we will discuss recent progress in heterostructures of a prototype three-dimensional Dirac semimetal\, cadmium arsenide (Cd3As2)\, which are grown by molecular beam epitaxy. We show that high-mobility\, e pitaxial Cd3As2 films can be grown in different crystallographic orientatio ns and that confinement and strain can be used to manipulate their topologi cal states. We discuss their transport properties\, such as the nature of the quantum Hall effect that originates from the surface Dirac states. We also discuss potential applications of these films as channel materials in field effect devices for high-frequency applications. For example\, calcul ations based on our experimental measurements of the materials parameters s how that ultra-scaled field effect devices with Cd3As2 channels promise cut -off frequencies above 1.5 THz and unique properties\, such as linear behav ior. \;

    For the meeting link\, please email \;LPS_Seminar@lps.umd.edu LAST-MODIFIED:20210217T142911Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T160000Z DTEND:20211008T164500Z DTSTAMP:20260828T094430Z UID:7vcf9neu1fd8d9r7v4closp418@google.com CREATED:20210930T174640Z DESCRIPTION:Title: Observation of measurement-induced quantum phases in a trapped-ion quantum computer\nSpeaker: Pradeep Niroula (QuICS)\nTime: Fri day\, October 8\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nMany-body open quantum systems balanc e internal dynamics against decoherence from interactions with an environme nt. In this talk\, I describe an experiment that explores this balance via random quantum circuits implemented on a trapped-ion quantum computer\, whe re the system evolution is represented by unitary gates with interspersed p rojective measurements. As the measurement rate is varied\, a purification phase transition is predicted to emerge at a critical point akin to a fault -tolerant threshold. In the experiment\, we probe the "pure'' phase\, where the system is rapidly projected to a deterministic state conditioned on th e measurement outcomes\, and the "mixed'' or "coding'' phase\, where the in itial state becomes partially encoded into a quantum error correcting codes pace. We find evidence of the two phases and show numerically that\, with m odest system scaling\, critical properties of the transition emerge.\n\nPiz za and drinks served after the talk. LAST-MODIFIED:20211005T152050Z LOCATION:https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Pradeep Niroula TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220725T173000Z DTEND:20220725T183000Z DTSTAMP:20260828T094430Z UID:7kk0qgl3647mge2o16i60rjqsh@google.com CREATED:20220622T155817Z DESCRIPTION:Speaker: Bruno Laburthe-Tolra (Université Paris Nord - Villetan euse) \nTitle: Large spin atoms in optical lattices\n\nAbstract: Our experi mental projects at the Laser Physics Institute (North Paris University) aim at characterizing entanglement for many-body systems made of large spin at oms. For this\, we developed two experimental set-ups : one with large-spin strontium fermionic atoms\, with spin-independent contact interactions\; o ne with large-spin chromium bosonic atoms\, with spin-dependent long-range dipole-dipole interactions.\n\nI will first briefly describe our first meas urements of the spin distribution of the SU(N) Fermi gas made of strontium atoms. For this\, we used a spin-orbit coupling scheme\, where a retrorefle cted laser beam selectively diffracts two spin components in opposite direc tions. Spin sensitivity is provided by sweeping through a magnetic-field se nsitive transition while dark states ensure that spontaneous emission remai ns low.\n\nOn the chromium machine\, we investigated the spin dynamics and quantum thermalization of a macroscopic ensemble of S = 3 spins initially p repared in a pure coherent spin state. The experiment uses a unit-filled ar ray of 10 thousand chromium atoms in a three dimensional optical lattice. A toms interact at long distance under the effect of magnetic dipole-dipole i nteractions\, realizing the spin-3 XXZ Heisenberg model with long-range cou plings. We investigated the build-up of quantum correlations in this many-b ody system. For this\, we measured collective properties such as the total population in the seven different Zeeman states\, or the collective spin le ngth. We also found that the measurement of magnetization fluctuations prov ides direct quantitative estimates for two-body correlations. LAST-MODIFIED:20220622T155958Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210720T200000Z DTEND:20210720T210000Z DTSTAMP:20260828T094430Z UID:5slffd88bct4qd927p5n2fl4el@google.com CREATED:20210624T124818Z DESCRIPTION:Title: Quantum coding with low-depth random circuits
    Speake r: Michael Gullans (QuICS)
    Time: Tuesday\, July 20\, 2021 - 4:00 pm
    Location: Virtual Via Zoom: https://umd.zoom.us/j/95843628305?pwd=bmZ acFBQaDRPSHlqKzY1YzNYRDMrZz09

    We study quantum error correcting codes generated by local random circuits and consider the circuit depth req uired to achieve high-performance against local error models. Notably\, we find that random circuits in D spatial dimensions generate high-performing codes at depth at most O(log N) independent of D. Our approach to quantum c ode design is rooted in arguments from statistical physics and establishes several deep connections between random quantum coding and critical phenome na in phase transitions. In addition\, we introduce a method of targeted me asurements to achieve high-performance coding at sub-logarithmic depth abov e one dimension. These latter results provide interesting connections to th e topic of measurement-induced entanglement phase transitions.

    Refer ence: Gullans\, Michael J.\, et al. "Quantum coding with low-depth random c ircuits." arXiv preprint arXiv:2010.09775 (2020).

    This talk is part of the IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210714T203215Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Michael Gullans TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220906T171500Z DTEND:20220906T181500Z DTSTAMP:20260828T094430Z UID:29ptf517p03qnttjsno0pcu9fa@google.com CREATED:20220901T151921Z LAST-MODIFIED:20220901T151932Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210412T203000Z DTEND:20210412T213000Z DTSTAMP:20260828T094430Z UID:3soaj3i62hki2isketbb8kuler@google.com CREATED:20210320T042530Z DESCRIPTION:Title: The AMS Latest Results And The Impact On The Design Of F uture Cosmic Ray Space Experiments

    Speaker: Matteo Duranti\, INFN Se zione di Perugia\, Italy

    Abstract: The AMS-02 experiment provided and is providing measurements on the Cosmic Ray composition and spectral features with unprecedented accuracy. Its her itage\, however\, lies not only in its results but also in the approach to develop and design new and even more ambitious space experiments. In this s eminar\, the latest results and highlights of AMS-02 will be presented as w ell as an overview of what can be the new generation of detectors (HERD\, A LADInO and AMS-100) in the short and mid-term.

    Notes: Visit \;https://bit.ly/2PmJoT6 \;for access.  \;Join the meeting at 4:15PM for meet &\; greet LAST-MODIFIED:20210421T153712Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220224T173000Z DTEND:20220224T190000Z DTSTAMP:20260828T094430Z UID:2otnosu6gvqon44tcdav05qskh@google.com CREATED:20220209T172551Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

    Sp eaker: Ulf Meissner\, U Bonn

    Title: Recent Developments on Nuclear L attice EFT



    Abs tract: Nuclear Lattice Effective Field Theory (NLEFT) is a fairly new appro ach to tackle nuclear
    few- and many-body problems . After a short introduction\, I will discuss recent results\, such as
    the hidden spin-isospin exchange symmetry\, the Wigne r SU(4) symmetry and the emergence
    of duality in the spectrum of 12C\, the first steps towards heavy nuclei and ab initio nu clear
    thermodynamics. I end with an outlook conce rning what can be expected from NLEFT in the years to come. LAST-MODIFIED:20220217T182223Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T140000Z DTEND:20220511T153000Z DTSTAMP:20260828T094430Z UID:11n4ckpuf4in5695fc8d5jpcsl@google.com CREATED:20220510T151847Z DESCRIPTION:\nTitle: Renormalon Effects in the Calculation of Parton Distri bution Functions on Lattice\n\nAbstract: Perturbative calculations of the q uasi-parton distributions (PDF) contain factorially growing coefficients at high order due to the renormalon ambiguity in the Wilson line self energy. Such renormalon effects introduce extra systematic uncertainties to our ex tractions of PDFs from lattice data\, and could hardly be avoided if we aim at high precision calculation of the lightcone distributions on lattice. I n this work\, we propose an approach to properly determine the renormalon c ontributions in the Wilson line self energy from lattice data\, and to perf orm the renormalization and matching of the lattice data in a consistent wa y. LAST-MODIFIED:20220510T151847Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Rui Zhang Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211211T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211209T140000 EXDATE;TZID=America/New_York:20211202T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20260828T094430Z UID:7mcnlahfqn2ic1ebheevnj7gs9@google.com CREATED:20210924T121413Z DESCRIPTION:Speaker: TBA\n\n\nTitle: TBA\nAbstract:\n\n\nHost: TBA\n \nNote : there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121413Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210326T180000Z DTEND:20210326T193000Z DTSTAMP:20260828T094430Z UID:15rsb3n8pntmhmh1sb75d9asqe@google.com CREATED:20210125T152946Z DESCRIPTION:Seminar will be conducted via zoom: \; \;https:// umd.zoom.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT0 9

    Speaker: Dean Lee\, Michigan State U &\; FRIB


    Ti tle: Rodeo Algorithm for Quantum Computation

    Abstract: The rodeo alg orithm is a new algorithm for preparing quantum eigenstates \;
    on a quantum computer. It follows a strategy that is opposite to adiabatic \ ;
    evolution. Instead of slowly evolving a Hamiltonian to preserve the in stantaneous \;
    ground state\, it violently shakes off all quantum st ates that are not desired. I \;
    first introduce another method that works in the same modality\, called the projected \;
    cooling method. I then discuss the theory\, performance\, and implementation \;
    of the rodeo algorithm for arbitrary eigenstate preparation\, energy spectrum& nbsp\;
    determination\, and linear response functions. LAST-MODIFIED:20210311T145940Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T180000Z DTEND:20220204T184500Z DTSTAMP:20260828T094430Z UID:1qe42ccl369qreh4vkaebolrfv@google.com CREATED:20220131T153355Z DESCRIPTION:Title: Boson Sampling for Generalized Bosons
    Spe aker: En-Jui Kuo (QuICS)
    Time: Friday\, February 4\, 2022 - 1:00pm
    Lo cation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762

    We generalized the standard Boson sampling task including Linear Boson Sampling the Gaus- sian Boson Sampling from photons to what we call genera lized boson system which the computation relation between the creation and annihilation operators is not a constant. We showed that in such a system\, one still has the standard hardness results including Hafnian and Permanen ts. We also use the spin system as our example and provide an experimental setup.     LAST-MODIFIED:20220131T154752Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: En-Jui Kuo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T180000Z DTEND:20220411T190000Z DTSTAMP:20260828T094430Z UID:7bdhgg091evg603fbg266e7b25@google.com CREATED:20220406T181631Z DESCRIPTION:Speaker: \;Anushya Chandran (Boston Unive rsity)

    Where: ATL 4402

    Title: Quantization of d ynamics in quasi-periodically driven systems

    Abstract: In the past decade\, quantum simulators have increased in their power and scope\, offering exquisite dynamical control of tens or even hundreds of individua l atoms. Concurrently\, a topological revolution in our understanding of el ectronic band structures has taken place\, driven by the discovery of topol ogical insulators\, graphene and other topological materials. Remarkably\, these advances can be connected --- the dynamics of driven few level system s can be described using band structures in ``synthetic dimensions\,'' one per driving tone. Topological order in the synthetic band structure then le ads to quantized dynamical responses in the quantum simulator.

    In th is talk\, I will use a unifying frequency lattice construction to reveal no nadiabatic topological responses in quasiperiodically driven systems. We wi ll find that quasi-periodically driven qubits already exhibit topologically distinct dynamical phases\, and that a 2-tone driven inhomogenous wire can function as a quantized energy pump at any temperature. The latter system provides one of the few examples of many-body localization protected order that is absolutely stable. I will argue that the quantized energy pumping r egime is accessible in near-term optical and microwave cavity-QED experimen ts\, and that furthermore\, it is useful to prepare highly excited non-clas sical cavity states.


    Host: Dr. Jay Sau
     LAST-MODIFIED:20220406T181659Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210902T193000Z DTEND:20210902T203000Z DTSTAMP:20260828T094430Z UID:77b4gff8h0mj12p8l4m2ijvk0s@google.com CREATED:20210831T140623Z DESCRIPTION:Title: RIT on Geometry and Physics

    Abstract: This is an interdisciplinary learning seminar on topics of mutual interest to physicis ts and mathematicians. We will pick a topic for this year and decide how to approach it. Physics students\, postdocs\, and faculty are all welcome. To pics from previous years have included string theory\, supersymmetry\, topo logical states of matter\, and the AdS/CFT correspondence.

    Host: Jon athan Rosenberg
    Host E-Mail: \;jmr@umd. edu LAST-MODIFIED:20210831T140623Z LOCATION:Kirwan Hall Room 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquia/Seminar - CMNS Mathematics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220308T230000Z DTEND:20220309T015000Z DTSTAMP:20260828T094430Z UID:39boh5o9auqchm4j9lchsui4u9@google.com CREATED:20220210T145209Z DESCRIPTION:Suvi Gezari presents the film Contact as part of the Science and Society via Film course. All are welcome. For informati on and the entire semester's schedule\, see the course website: https://www.physics.um d.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145209Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contact TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220927T160000 DTEND;TZID=America/New_York:20220927T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20220927T160000 CREATED:20210423T130624Z DESCRIPTION:

    Structured Light and Darkness in Nanophotonics

    Natalia M. Litchinitser\, Duke University

    Abstract: Whenmultiple light be ams overlap in three-dimensional space\, their interferenceproduces lines o f complete darkness – optical vortices that can form closedloops – links or knots. In this talk\, wediscuss how thesynergy o f structured light and darkness with nanostructured photonic media couldbri ng new dimensions to the science and applications of light. Today\, the ter m“structured light” describes a variety of optical waveforms with the spati alinhomogeneity of one or more physical parameters in two- or three-dimensi onalspace and time. Topological concepts once considered mostly in the doma in of abstractmathematics or theoretical physics\, such as singularities of the phase orpolarization\, topological textures\, and spin-orbit interacti ons nowadays areentering the field of classical and quantum optics. We desi gn all-dielectricoptical nanostructures enabling unprecedented control over the amplitude\, phase\,and polarization of optical fields\, for generation of optical beams with anorbital angular momentum (OAM)\, as well as optica l links and knots\, and studytheir stability in linear and nonlinear media. For example\, by exploiting theemerging non-Hermitian photonics design at an exceptional point\, we demonstratea single-mode OAM microring laser. Nex t\, using the mathematical framework ofsupersymmetry\, we design and demons trate a stable two-dimensional microlaserarray that is scalable and could p rove to be a practical platform for developingcomplex nanophotonic systems. Finally\, we discuss a new family of nullsolutions to the Helmholtz equati on in three-dimensional free space - opticallinks and knots\, their generat ion and robustness in the presence of atmosphericturbulence\, and their int eractions with nonlinear optical media.

    Bio: Natalia Litchinitser is aProfessor of Electrical and Computer Engi neering and a Professor of Physics atDuke University. Her research focuses on linear and nonlinear optics inengineered nanostructures\, metamaterials\ , topological photonics\, as well as theengineering of the light beams them selves. Natalia M. Litchinitser earned herPh.D. degree in Electrical Engine ering from the Illinois Institute ofTechnology and a Master’s degree in Phy sics from Moscow State University inRussia. She completed her postdoctoral training at the Institute of Optics\, theUniversity of Rochester in 2000. N atalia Litchinitser previously was aProfessor of Electrical Engineering at the University at Buffalo\, The StateUniversity of New York\, a Member of T echnical Staff at Bell Laboratories\,Lucent Technologies\, and a Senior Mem ber of Technical Staff at Tyco SubmarineSystems. She authored 7 invited boo k chapters and over 250 journal and conferenceresearch papers. She is a Fel low of the American Physical Society (APS)\, aFellow of Optica (formerly th e Optical Society of America)\, a Senior Member ofthe IEEE and SPIE\, a co- Chair of CLEO Fundamental Science and SPIE Nanoscienceand Engineering Appli cations conferences in 2021-2022.

     \;< /span>

    LAST-MODIFIED:20220830T182632Z LOCATION:1410 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220920T150000Z DTEND:20220920T160000Z DTSTAMP:20260828T094430Z UID:2scg4mguks57gh29iv3bgvhnhv@google.com CREATED:20220815T164528Z DESCRIPTION:Speaker: Dr. George Lewis\, UMD School of Medicine\n\nTitle: Al losteric Networks Enable Emergent Biological Properties of Antibodies LAST-MODIFIED:20220815T164528Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220316T150000Z DTEND:20220316T161500Z DTSTAMP:20260828T094430Z UID:3c96qmsqjq8vc0m5k570ld7u0m@google.com CREATED:20220303T162638Z DESCRIPTION:Title: Capacity and Quantum Geometry of Parametrized Qu antum Circuits
    Speaker: Tobias Haug (Imperial College)
    Time: Wednes day\, March 16\, 2022 - 11:00am
    Location: ATL 3100A and Virtual Via Zoo m: https://umd.z oom.us/j/5037655723  Meeting ID: 503 765 5723

    To harness the pot ential of noisy intermediate-scale quantum devices\, it is paramount to fin d the best type of circuits to run hybrid quantum-classical algorithms. Key candidates are parametrized quantum circuits that can be effectively imple mented on current devices. Here\, we evaluate the capacity and trainability of these circuits using the geometric structure of the parameter space via the effective quantum dimension [1]. We find that the capacity exhibits sc aling laws and striking differences depending on the type of entangling gat es used. Based on our methods\, we propose an initialization strategy where the circuit is expressive but does not suffer from barren plateaus. Furthe r\, we identify a transition in the quantum geometry when the circuit becom es overparameterized. Finally\, we show an algorithm that prunes redundant parameters of a circuit without affecting its effective dimension. Our resu lts enhance the understanding of parametrized quantum circuits and can be i mmediately applied to improve variational quantum algorithms.

    [1] To bias Haug\, Kishor Bharti\, and M.S. Kim PRX Quantum 2\, 040309 (2021)


    https://umd.zoom.us/j/5037655723

    Meeting ID: 503 765 5723
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    < /u> LAST-MODIFIED:20220303T162638Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/5037655723 Meeting ID: 503 765 5723 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Tobias Haug TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T193000Z DTEND:20220511T203000Z DTSTAMP:20260828T094430Z UID:69rq40oosg00tnpttf3pmo7f7m@google.com CREATED:20220509T135755Z DESCRIPTION:

    Quantum Characterization and Control: Theory\, Practice a nd Potential

     \;

    Jonathan L DuBois\, Ph. D. will presen t an overview of some recent work from the Quantum Coherent Device Physics Group at Lawrence Livermore National Lab (LLNL) with a focus on open and cl osed-loop feedback control of superconducting qubits.

     \;

    < b>Bio: \;Dr. DuBois received a PhD in computational condensed matte r theory in 2003 from the University of Delaware. His research interests in clude computational condensed matter physics\, quantum systems architecture and application co-design\, quantum optimal control\, and hybrid quantum-c lassical algorithm development. He currently leads the Quantum Coherent Dev ice Physics Group at LLNL.

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    Need help? Go to \;https://he lp.webex.comQuantum Characterization and Control: Theory\, Practice and Potential

     \;

    Jonathan L DuBois\, Ph. D. will prese nt an overview of some recent work from the Quantum Coherent Device Physics Group at Lawrence Livermore National Lab (LLNL) with a focus on open and c losed-loop feedback control of superconducting qubits.

     \;

    Bio: \;Dr. DuBois received a PhD in computational condensed matt er theory in 2003 from the University of Delaware. His research interests i nclude computational condensed matter physics\, quantum systems architectur e and application co-design\, quantum optimal control\, and hybrid quantum- classical algorithm development. He currently leads the Quantum Coherent De vice Physics Group at LLNL.

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    LAST-MODIFIED:20220228T183037Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=mc334dc03f4f334d9d8e1bcb4 b3a37a70 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Molecular Coupling Competing with Defects Within Insulator of the M agnetic Tunnel Junction-based Molecular Spintronics Devices TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211019T160000 DTEND;TZID=America/New_York:20211019T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211019T160000 CREATED:20200116T204737Z DESCRIPTION:

    Title: \; \;Structural Color - Origin and Evolution in Nature

    Speaker: Hui Cao\, Department of Appli ed Physics\, Yale University

    Abstract:

    St ructural color originates from physical interaction of light with nanostruc tures. Most studies so far have focused on ordered structures which produce iridescent colors that change with viewing angle. However\, nature has use d extensively quasi-ordered structures to create weakly iridescent colors. An interdisciplinary team\, consisting of optical physicists\, material sci entists\, and biologists at Yale\, has investigated the physical mechanism for coloration of nanostructures with short-range order in bird feather bar bs. Inspired by nature\, a simple technique is developed to fabricate large -scale biomimetic films which display isotropic structural color\, that is amenable to potential applications in coatings\, cosmetics\, and textiles. In order to understand how the structural color evolves in nature\, artific ial selection has been conducted on a lab model butterfly to evolve the str uctural color of wing scales and compared to natural selection. This study reveals the physical mechanism of structural color evolution\, which stands in sharp contrast to pigment color evolution

    Registration is required for this event: http://science.umd.edu/events/pai-2021.html

    LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium (IPST Shih-I Pai Lecture) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210322T200000Z DTEND:20210322T210000Z DTSTAMP:20260828T094430Z UID:6t2c8j81bdlu2fqt6v5tfjj260@google.com CREATED:20210202T162943Z DESCRIPTION:Speaker: Samuel McDermott\, Fermilab

    Title: Sources of L ow-Energy Events in Low-Threshold Dark Matter Detectors


    Abstract : In recent years\, searches for dark matter with sub-GeV masses have been performed by a variety of novel experiments that have reached the low-energ y thresholds required for detection.
    Most of these experiments have obse rved a large amount of background events of unknown origin\, which signific antly hinder their discovery reach.
    In this talk\, we demonstrate that a significant fraction of these events are due to low energy photons created by tracks passing through detector materials via the Cherenkov process and radiative recombination. In particular\, we demonstrate that these process es can explain the totality of the previously unaccountable events at SENSE I and SuperCDMS HVeV. In addition\, we show that these novel backgrounds ar e rather universal\, so they are a concern for both current and future prop osed experiments employing different detection technologies. Having identif ied these backgrounds\, we demonstrate that concrete strategies can be impl emented at upcoming detectors to reduce them\, enhancing in this way their discovery potential.Title and Abstract: tk

    For zoom link please emai l mknouse@umd.edu LAST-MODIFIED:20210322T125111Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211206T213000Z DTEND:20211206T223000Z DTSTAMP:20260828T094430Z UID:287ud2ns489o9b34baojsci696@google.com CREATED:20211110T185647Z DESCRIPTION:Title: High-energy neutrinos from AGN jets\n\nSpeaker: Foteini Oikonomou\, Norwegian University of Science and Technology\n\nAbstract: The recent discovery of high-energy astrophysical neutrinos has opened a new w indow to the Universe. Identifying the sources of these neutrinos is the ma in focus of the emerging field of neutrino astronomy. Combining neutrino da ta and electromagnetic measurements in a multi-messenger approach may lead us to the sources of the neutrinos and help to solve the long-standing big question of the origin of high-energy cosmic rays. A leading candidate sour ce population is active galactic nuclei (AGN)\, which host accreting superm assive black holes and relativistic jets. In this talk\, I will review the current status of the field and what we know about the possible role of jet ted AGN as sources of high-energy neutrinos.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211110T185647Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210414T193000Z DTEND:20210414T203000Z DTSTAMP:20260828T094430Z UID:797usfansiaiek34eb1g2f5psc@google.com CREATED:20210412T130658Z DESCRIPTION:Title : Shocks Under the Microscope: Examining the Microphysics of Collisionless Shocks with High Resolution\, Multi-point Space Plasma Me asurements

    Speaker Name: Katherine Goodrich
    Speaker Institution : UC-Berkeley

    Abstract : Collisionless shocks are an important and un iversal phenomenon in astrophysical plasmas. \; Shocks form when a supe rsonic plasma flow interacts with an impermeable obstacle. Examples of such interactions include galactic jets or supernova remnants interacting with the interstellar medium\, or plasma wind from stars encountering stellar sy stem bodies\, such as planets\, comets and moons. The shock performs the ne cessary function of converting kinetic energy to thermal energy\, heating t he originally supersonic plasma flow until its speed is reduced and it can flow around the obstacle. The energy conversion processes that take place i nside collisionless shocks\, however\, are not well established and have th us been a subject of interest for several decades.
    The closest and perha ps the most relevant collisionless shock to us humans\, is the Earth's bow shock. This shock forms 10-12 Earth radii upstream of our planet when super sonic plasma ejected from the sun\, called the solar wind\, meets the Earth 's intrinsic magnetosphere. The bow shock has been observed by multiple spa cecraft such as ISEE\, Cluster\, WIND\, and THEMIS over three decades. Thes e missions have provided us with a wealth of information on plasma conditio ns both upstream and downstream of the shock\, however\, limited instrument capabilities have prevented us from resolving the physical processes activ e at the shock itself. \; The energy conversion processes active within shocks are expected to occur at primarily electron spatial and time scales (milliseconds to seconds)\, which up until recently \; were beyond the reach of our particle observations. While we can rely on highly time resol ved magnetic and electric field measurements from these missions\, they pro vide an incomplete view of the inner workings of the shock.

    Observat ions from the Magnetospheric Multiscale (MMS) mission (launched in 2014) pr ovide particle observations on the order of 10s of milliseconds\, providing an unprecedented opportunity to directly observe microscale processes insi de collisionless shocks. In this talk\, we'll take a first look at the dire ct connection between electric and magnetic field signals with electron and ion dynamics in the Earth's bow shock. We find that energy conversion can occur from multiple processes\, some unexpected\, within varied areas of th e shock. The new dataset provided by MMS enables a new age of collisionless shock analysis as well as motivation for future space missions dedicated t o the shock\, signaling an exciting time for space physicists!

    Host Name: Marc Swisdak
    Host E-Mail: \;s wisdak@umd.edu LAST-MODIFIED:20210412T130658Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210401T140000 DTEND;TZID=America/New_York:20210401T153000 DTSTAMP:20260828T094430Z UID:02m9gb23jfvmf9r2m7imi3fuoi@google.com RECURRENCE-ID;TZID=America/New_York:20210325T140000 CREATED:20210124T203625Z DESCRIPTION:Speaker: Darrell Schlom\, Cornell University\n\n\nTitle: TBA\nA bstract:\n\n\nHost: TBA\nFor the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210125T162202Z LOCATION: Online via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Darrell Schlom\, Cornell University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210401T193000Z DTEND:20210401T203000Z DTSTAMP:20260828T094430Z UID:7b0sjk66jgv256masddvhmq9m2@google.com CREATED:20210322T143658Z DESCRIPTION:Speaker Name: Steven Jin\nSpeaker Institution : University of M aryland\n\nTitle : RIT on Geometry and Physics\n\nNotes: This seminar\, joi nt between the physics and math departments\, will start on a new topic in April 2021\, namely connections between gauge theory in dimension 4 and the geometric Langlands program\, following work of Kapustin-Witten and others .\n \nContact Jonathan Rosenberg for link jmr@umd.edu LAST-MODIFIED:20210326T170616Z LOCATION:Location: online\, contact Jonathan Rosenberg for link jmr@umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T173000Z DTEND:20220316T190000Z DTSTAMP:20260828T094430Z UID:3kou831fbnf46j2mc4fnp1flca@google.com CREATED:20220210T154703Z DESCRIPTION:
    Seminar will be conducted via zoom.
    Speaker: David London\, University of Montreal \;

    Title: Anoma lies in B Decays: A Sign of New Physics?

    Abstract: At present\, ther e are several measurements of observables in B decays that disagree with
    the predictions of the Standard Model. These can be separated into two cla sses of decays\,
    those involving b → sμ+μ− or b → c`ν ̄` transitions. Th e size of the deviations varies from
    ∼ 2σ to >\;∼ 4σ. We may be seeing signs that new physics (NP) is present in these decays. In
    this talk\, I will review these anomalies\, focusing on their dependence (or not) on th eoretical
    input. I will discuss the possible NP explanations\, as well a s ways of distinguishing these
    NP models.

    For zoom link please em ail mknouse@umd.edu     LAST-MODIFIED:20220301T171747Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint JHU/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T203000Z DTEND:20211201T213000Z DTSTAMP:20260828T094430Z UID:29mrd446n7f684nekn6tv30g24@google.com CREATED:20211129T133459Z DESCRIPTION:Title : Particle Energization in Perpendicular and Oblique Shoc ks and Related Instabilities

    Speaker Name: Jason TenBarge

    Speaker Institution : PPPL

    Notes: Contact swisdak@umd.edu for Zoom address.

    Abstract : Collisionl ess shocks play an important role in space and astrophysical plasmas by irr eversibly converting the energy of the incoming supersonic plasma flows int o other forms. We leverage the pristine phase space representation made pos sible by direct discretization of the Vlasov-Maxwell system within the Gkey ll framework to directly diagnose the exchange of energy between fields and particles in perpendicular and oblique shocks. We identify the phase space signatures of shock drift acceleration and adiabatic heating. Additionally \, we examine the electron cyclotron drift instability (ECDI)\, which is of ten observed in the foot and ramp of heliospheric shocks and plays an impor tant role in heating electrons and ions\, as well as supplying anomalous re sistivity. Motivated by the non-Maxwellian particle distributions observed in heliospheric shocks\, we present preliminary results concerning the modi fication of the ECDI initialized with a kappa electron distribution compare d to traditional predictions derived under Maxwellian assumptions. LAST-MODIFIED:20211129T133533Z LOCATION:online SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201124T160000 DTEND;TZID=America/New_York:20201124T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201124T160000 CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210927T110000 DTEND;TZID=America/New_York:20210927T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210927T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Jainendra Jain\, Pennsylvania State University\n\nTitl e: The magic of emergent topological particles\nAbstract: The fractional qu antum Hall system is one of the most strongly correlated systems in the wor ld\, because its physics is fully dictated by the interaction between the e lectrons\, with their kinetic energy having been fully suppressed by the ma gnetic field. Somewhat surprisingly\, much of the vast phenomenology of the fractional quantum Hall effect is now understood not only qualitatively bu t with a microscopic precision that rivals\, ideally\, that of atomic physi cs. This has become possible thanks to the emergence of the topological par ticle called composite fermion. After a brief review of various states and phenomena of composite fermions meant for the non-specialists\, this talk w ill focus on recent developments connected to experiments. It will also int roduce a model interaction that can be solved for all eigenstates at arbitr ary filling factors\, and produces fractional quantum Hall effect. \n\nHost : Alicia Kollar LAST-MODIFIED:20220617T080738Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210218T140000 DTEND;TZID=America/New_York:20210218T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201203T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:78n3qkdkar7v3bpgvi31shgiqr@google.com CREATED:20210209T171538Z DESCRIPTION:Speaker: Jared Allred\, University of Alabama
    Title: Discove ry of two-dimensional ordering driven by geometrically frustrated displacem ents embedded in rutile'\;s structural instability
    Abstract:

    Th e functionality of solid-state devices is often linked to phase transitions in one or more of the components. In order to optimize the properties of t hese solid state materials\, it is important to understand how the properti es emerge from the fundamental electronic interactions. Vanadium dioxide (V O2) is famous for its metal-to-insulator phase transition slightly above ro om temperature\, which includes a strong structural component. The nature o f the structural instability within the transition is not fully understood\ , let alone whether it is a result or the cause of the electronic transitio n. Moreover\, chemical substitution leads to unexpected changes in the stru cture and properties\, indicating a complex balance of interactions underly ing the transition. This seminar will present state-of-the-art total x-ray scattering measurements on VO2 alloyed with other transition metals that re veals a new and unique phase at low temperatures\, dubbed the “2D-M2 phase” \, that is characterized by ordering of atomic displacements in only two di mensions. The structural details of the 2D-M2 phase are explained by a geom etric frustration model\, where ordering along one axis impedes ordering on its symmetry-equivalent partner. These findings suggest that previous elec tronic models that could not predict this behavior are likely incomplete. C omparing the physical properties systematically across multiple composition s suggest that electron-correlations are important to the phase transition.  


    Related Publications


    1. Davenport\, Mathew A.\; Allred\, J.M.\; A crystallographic approach to the short-range ordering pro blem in V1-xMoxO2 (0.50 ≤ x ≤ 0.60)\, J. Mater. Chem. C\, 8\, 10907-10916\, (2020) DOI: 1 0.1039/D0TC01173H

    2. Davenport\, Matthew A.\, Confer\, Matt hew P\, Douglas\, Tyra C\, Rawot Chhetri\, Top B.\, Allred\, Jared M.\; Lar ge single crystals of V1-xMoxO2 from a two-step\, chemical vapor transport synthesis. Cryst. Growth Des.\, 20\, 6\, 2625-2640 (2020) DOI: 10.1021/acs.cgd.9b012 96

    3. Davenport\, M. A.\, Krogstad\, M. J.\; Whitt\, L. M.\ ; Hu\, C.\; Douglas\, T.C. Douglas\; Ni\, N.\; Rosenkranz\, S\; Osborn\, R. \; Allred\, J. M.\; Fragile 3D Order in V1-xMoxO2. Under Review\, Submitted November 2019\; Accessible as a pre-print on arXiv:1909.12704 


    Host:  Rodriguez
    Link: https://umd.zoom.us/j/91 251230757?pwd=MkhFREJrUXNTekVZTTRGQ244M1VBZz09< /a>

    Meeting ID: 912 5123 0757

    Password:   558484 LAST-MODIFIED:20210209T171538Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Jared Allred\, University of Alabama TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T170000Z DTEND:20211008T180000Z DTSTAMP:20260828T094430Z UID:7hpljg8la6k200c3suemp7tl25@google.com CREATED:20210914T145728Z DESCRIPTION:Speaker: Shu Yang\, Professor and Chair\, Materials Science and Engineering\, University of Pennsylvania\n\nTitle: Kirgami: Programming\, Cutting and Folding from Microscale to Meter Scale\n\nAbstract: Programmabl e shape-shifting materials can take different physical forms to achieve mul tifunctionality in a dynamic and controllable manner. By introducing holes and cuts in 2D sheets macroscopically\, we demonstrate dramatic shape chang e and super-conformability via expanding or collapsing of the hole arrays w ithout deforming individual lattice units. When choosing the cuts and geome try correctly\, we show folding into the third dimension\, known as kirigam i. By programming the geometry of cuts and folding angles\, we explore thei r potential applications in solar shading\, water harvesting\, super-stretc hable and shape conformable medical devices. LAST-MODIFIED:20210914T145728Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T180000Z DTEND:20220328T190000Z DTSTAMP:20260828T094430Z UID:0kcv8q6b649pjsgcdj6n1hn008@google.com CREATED:20220325T024241Z DESCRIPTION:Title: On the Foundations of the Next-Generation Quantum Softw are System\nSpeaker: Gushu Li (University of California\, Santa Barbara)\n Time: Monday\, March 28\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https: //umd.zoom.us/j/98095131895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09\n\nThe software system is one essential and critical component in a quantum compu ting system. However\, existing quantum software infrastructures are mainly designed for small-scale quantum computers while they cannot effectively a ccommodate large-scale quantum computing systems. In this talk\, I will fir st summarize the challenges in designing quantum software systems as the si zes of quantum computer systems continue to grow. Then I will show how we c an overcome this grand scalability challenge by leveraging the power of hig h-level operators in various important tasks\, including quantum compiler o ptimization\, quantum program testing\, and so on. In the end\, I will brie fly introduce my work on quantum software-hardware co-design and conclude m y talk with future research opportunities. LAST-MODIFIED:20220325T024241Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSy tQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Gushu Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T140000Z DTEND:20220408T150000Z DTSTAMP:20260828T094430Z UID:143biu124gpu8agqoklschd5e8@google.com CREATED:20220403T201754Z DESCRIPTION:Title: Quantum advantage in learning from experimen ts
    Speaker: Hsin-Yuan (Robert) Huang (Caltech)
    Time: Friday\, April 8\, 2022 - 10:00am
    Location: ATL 3100A and Virtual Via Zoom: http s://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09
    Quantum technology has the potential to revolutionize how we acquire and process experimental data to learn about the physical world. An experimenta l setup that transduces data from a physical system to a stable quantum mem ory\, and processes that data using a quantum computer\, could have signifi cant advantages over conventional experiments in which the physical system is measured and the outcomes are processed using a classical computer. We p rove that\, in various tasks\, quantum machines can learn from exponentiall y fewer experiments than those required in conventional experiments. The ex ponential advantage holds in predicting properties of physical systems\, pe rforming quantum principal component analysis on noisy states\, and learnin g approximate models of physical dynamics. In some tasks\, the quantum proc essing needed to achieve the exponential advantage can be modest\; for exam ple\, one can simultaneously learn about many noncommuting observables by p rocessing only two copies of the system. Conducting experiments with up to 40 superconducting qubits and 1300 quantum gates\, we demonstrate that a su bstantial quantum advantage can be realized using today's relatively noisy quantum processors. Our results highlight how quantum technology can enable powerful new strategies to learn about nature.

    Join Zoom Meeting
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    Meeting ID: 989 367 6372
    Passcode: 578842     LAST-MODIFIED:20220403T202748Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Hsin-Yuan (Robert) Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220419T220000Z DTEND:20220420T005000Z DTSTAMP:20260828T094430Z UID:27v66q0eigfobpkdm9fqpe4c2v@google.com CREATED:20220210T150023Z DESCRIPTION:Jonathan Simon presents the filmEternal Sunshin e of the Spotless Mind as part of the Science and Society via Film co urse. All are welcome. For information and the entire semester's schedule\, see the course website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150023Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Eternal Sunshine of the Spotless Mind TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200929T150000 DTEND;TZID=America/New_York:20200929T160000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20200929T160000 CREATED:20200116T204737Z DESCRIPTION:
    Gianfranco Pacchioni\, Universita' degli Studi di Milano -Bicocca

    This will begin at 3 p.m.< /i>

    Hosted by Victor Yakovenko

    Zoom Link: \;< a href="https://umd.zoom.us/j/7193062799?pwd=NHdoNitta1RkVEZKTVExZzg5V1hKdz 09">https://umd.zoom.us/j/7193062799?pwd=NHdoNitta1RkVEZKTVExZzg5V1hKdz09

    Meeting Id: 719 306 2799 \;  \;Passcode: 89593

    The Overp roduction of truth: Passion\, competition\, and integrity in modern science  \;


    The way science is done has changed radically in rec ent years. Scientific research and institutions\, which have long been char acterized by passion\, dedication and reliability\, have increasingly less capacity for more ethical pursuits\, and are pressed by hard market laws. F rom the vocation of a few\, science has become the profession of many — pos sibly too many. These trends come with consequences and risks\, such as the rise in fraud\, plagiarism\, and in particular the sheer volume of scienti fic publications\, often of little relevance. We will critically review and assess the present-day policies and behaviors in scientific production and publication. We will touch on the tumultuous growth of scientific journals \, in parallel with the growth of self-declared scientists over the world. We will investigate the loopholes and hoaxes of pretend journals and nonexi stent congresses\, so common today in the scientific arena\, and discuss pr oblems connected to the incorrect use of bibliometric indices\, which have resulted in large part from the above distortions of scientific life. The s olution? A slow approach with more emphasis on quality rather than quantity that will help us to rediscover the essential role of the responsible scie ntist.

    Reference: G. Pacchioni\, The Overproduction of truth. Passion\, competition\, and integrity in modern science\, Oxford University Press\, Oxford 2018.

    Gian franco Pacchioni received his PhD at the Freie Universität Berlin in 1984. He worked at the IBM Almaden Research Center\, and at the Technical Univers ity of Munich. He is Full Professor at the University of Milano Bicocca whe re he has been Vice Rector for Research (2013-2019) and Director of the Dep artment of Materials Science (2003-2009). He has published more than 500 pa pers (h index 85\; WoS) and given nearly 500 invited talks on the electroni c structure of oxide surfaces and interfaces\, 2D oxides\, defects\, suppor ted metal clusters\, and catalysis. He received several awards and is Fello w of the Accademia Nazionale dei Lincei (2014)\, the Academia Europaea (201 2)\, and the European Academy of Sciences (2009). He has authored some popu lar science books\, including “The overproduction of truth”\, Oxford Univer sity Press\, 2018\, where he presents a personal view of the problems of co ntemporary science.


    https ://qclab.mater.unimib.it/ LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210420T150000Z DTEND:20210420T160000Z DTSTAMP:20260828T094430Z UID:17mbldl911epeue49nc4fdu3il@google.com CREATED:20210412T191456Z DESCRIPTION:Speaker: \;Patrick Lee \;(MIT)
    Title:  \;A tale of two TMD insulators: TaSe2 and WTe2.
    Abstract: \;< /b>I shall discuss two monolayer transition metal dichalcogenides (TMD) tha t have unusual properties and are insulating for very different reasons. Ta Se2 is a cluster Mott insulator that is a promising candidate for a quantum spin liquid with spinon Fermi surface. I shall discuss the formation of a Kondo resonance between a magnetic impurity and the spinon Fermi surface as well as super modulations and their consequences for STM tunneling. Monola yer WTe2 is a topological quantum spin Hall insulator but why it is insulat ing is not fully understood. Recently sharp quantum oscillation peaks in th e conductivity have been discovered in the insulator that resemble quantum oscillations in metals. While there are some controversies about whether th is is intrinsic\, I shall discuss a proposed explanation in terms of its be ing an excitonic insulator.
    Host Yang-Zhi Chou


    For Zoom Details email rcawthor@umd.edu LAST-MODIFIED:20210412T191456Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T203000Z DTEND:20211201T213000Z DTSTAMP:20260828T094430Z UID:6uatghhgj1dk1dr8i7eorm24h7@google.com CREATED:20211129T140603Z DESCRIPTION:Speaker Name: Jason TenBarge
    Speaker Institution : PPPL
    < br>Title : Particle Energization in Perpendicular and Oblique Shocks and Re lated Instabilities

    Abstract : Collisionless shocks play an importan t role in space and astrophysical plasmas by irreversibly converting the en ergy of the incoming supersonic plasma flows into other forms. We leverage the pristine phase space representation made possible by direct discretizat ion of the Vlasov-Maxwell system within the Gkeyll framework to directly di agnose the exchange of energy between fields and particles in perpendicular and oblique shocks. We identify the phase space signatures of shock drift acceleration and adiabatic heating. Additionally\, we examine the electron cyclotron drift instability (ECDI)\, which is often observed in the foot an d ramp of heliospheric shocks and plays an important role in heating electr ons and ions\, as well as supplying anomalous resistivity. Motivated by the non-Maxwellian particle distributions observed in heliospheric shocks\, we present preliminary results concerning the modification of the ECDI initia lized with a kappa electron distribution compared to traditional prediction s derived under Maxwellian assumptions.

    Host Name: Marc Swisdak
    H ost E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211129T140603Z LOCATION:Contact swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20260828T094430Z UID:3aclm4v1mr59lgldh18ig4uogj@google.com CREATED:20220426T012318Z DESCRIPTION:Title: \; Shadow sequence estimation: a p rimitive for learning gate set noise
    Speaker: \; \;Jonas Helsen (CWI\, Amsterdam)
    Time: \; \;Tuesday\, May 3\, 2022 - 11:00am
    Location: \; \;ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96025919736 Meeting ID: 960 2591 9736

    In this talk I want to introduce shadow sequence estimation. This is a protocol for learning noise in (random) quan tum circuits in a flexible and scalable manner. It arises essentially as a combination of randomised shadow estimation (in the Huang-Kueng-Preskill se nse) and randomised benchmarking\, a time-honoured gate-fidelity estimation protocol. I will introduce the protocol\, sketch the mathematics behind it s correctness and scalability\, and then I will (hopefully) demonstrate its usefulness through several example estimation protocols\, namely unitary o ptimisation\, crosstalk tomography and a robust state shadow estimation pro tocol.

    This talk is based on arXiv: 2110.13178.

    (Please note the change to the date of this seminar.)
     LAST-MODIFIED:20220426T012401Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96025919736 Meeting ID: 960 2591 9736 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Jonas Helsen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T150000Z DTEND:20211020T161500Z DTSTAMP:20260828T094430Z UID:5nqchu2eaervnhalpku3oong8o@google.com CREATED:20210914T154756Z LAST-MODIFIED:20211014T134440Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - SEMINAR CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220810T150000Z DTEND:20220810T160000Z DTSTAMP:20260828T094430Z UID:679vg4e1h97vgpdscc301hle4k@google.com CREATED:20220726T152007Z DESCRIPTION:Title: General guarantees for non-uniform randomized benchmark ing and applications to analog simulators\nSpeaker: Ingo Roth (Technology Innovation Institute)\nTime: Wednesday\, August 10\, 2022 - 11:00am\nLocat ion: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?pwd=SWJ SRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nRandomized benchmarking protocols have become the prominent tool for assessing the quality of gates on digital qu antum computing platforms. In `classical'\; variants of randomized benc hmarking multi-qubit gates are drawn uniformly from a finite group. The fu nctioning of such schemes be rigorous guaranteed under realistic assumption s. In contrast\, experimentally attractive and practically more scalable r andomized benchmarking schemes often directly perform random circuits or us e other non-uniform probability measures. An important example for such a n on-uniform protocol is linear cross-entropy benchmarking. The theoretical u nderstanding of non-uniform randomized benchmarking is still an ongoing eff ort. We present a new extension of general theoretical guarantees for rand omized benchmarking to non-uniform measures. Combined with results on rando m walks\, our results identify experimental parameter regimes where one can guarantee non-uniform randomized benchmarking protocols to work reliably. One main motivation for the new guarantees is the development of trusted an d efficient randomized benchmarking schemes for analog quantum simulators. We discuss how the framework of non-uniform randomized benchmarking can be applied in the context of bosonic and fermionic analog quantum simulators. LAST-MODIFIED:20220727T005516Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS-QuICS Special Seminar: Ingo Roth TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210805T190000Z DTEND:20210805T200000Z DTSTAMP:20260828T094430Z UID:6g8alde6l8p9n0qqdk57hfhlt5@google.com CREATED:20210729T194143Z DESCRIPTION:Speaker: Rodrigo Andrade E Silva\n\nTitle: Quantization of a ca usal diamond in 2+1 dimensional gravity\n\nAbstract: We develop the reduced phase space quantization of causal\ndiamonds in pure 2+1 dimensional gravi ty with a negative\ncosmological constant. The system is defined as the dom ain\nof dependence of a spacelike topological disk with fixed\nboundary len gth. By solving the constraints in a\nconstant-mean-curvature time gauge an d removing all the\nspatial gauge redundancy\, we find that the phase space is\nthe cotangent bundle of Diff^+(S^1)/PSL(2\, R). To quantize\nthis nonl inear phase space we apply Isham's group-theoretic\nquantization scheme\, a nd find that the quantum theory can be\nrealized by wavefunctions on some c oadjoint orbit of the\nVirasoro group\, with labels in irreducible unitary\ nrepresentations of the corresponding little group. We find\nthat the twist of the diamond boundary loop is quantized in\nterms of the ratio of the Pl anck length to the boundary\nlength. LAST-MODIFIED:20210729T194151Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210426T160000 DTEND;TZID=America/New_York:20210426T170000 DTSTAMP:20260828T094430Z UID:6he7qnpm9dt692jcfcufhg48m3@google.com RECURRENCE-ID;TZID=America/New_York:20210426T160000 CREATED:20210423T163414Z DESCRIPTION:Speaker: Tomer Volansky\, Tel Aviv University

    Title: Why Chase Ambulances?

    Abstract: Every now and then\, a new experimental result is reported\, hinting towards new physics. The subsequent "ambulanc e chasing” phenomena in which many papers are written shortly after the res ult is published\, is sometimes (and justifiably) criticized. In this talk\ , I will discuss the positive aspects of ambulance chasing\, demonstrating new ideas that stem from such studies. Two recent case studies will be cons idered: the EDGES sky-average 21-cm absorption signal and the XENON1T elect ron-recoil result.

    For zoom link please email: mknouse@umd.edu LAST-MODIFIED:20220617T080546Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211119T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211104T140000 DTSTAMP:20260828T094430Z UID:7e32v5dj8kg84fh3s0aoksijf1@google.com CREATED:20210924T122545Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: TBA\n \nNote: there will NOT b e receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122545Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Brenden Ortiz\, UC Santa Barbara TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220919T150000 DTEND;TZID=America/New_York:20220919T163000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20220928T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20220926T150000 DTSTAMP:20260828T094430Z UID:15hs531cbbchm32r0e12abvc9k@google.com CREATED:20220815T134855Z DESCRIPTION:Speaker: Qianshu Lu\, Harvard\n\nTitle and Abstract: tk LAST-MODIFIED:20220815T134855Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221005T190000Z DTEND:20221006T000000Z DTSTAMP:20260828T094430Z UID:76t7ofemhbp424kf03g9il302r@google.com CREATED:20220909T190024Z LAST-MODIFIED:20220909T190040Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:OSES HOLD PSC Lobby (PhysCon) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220214T160000 DTEND;TZID=America/New_York:20220214T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220214T160000 CREATED:20220131T204640Z DESCRIPTION:
    Title: \; \;Nematicity and Strain Techniques

    Abstract: \; \;"Electronic nematicity is a relatively new t opic of research and is often very relevant to strongly correlated electron systems. Studies show there is interesting interplay between nematicity an d other phases\, like superconductivity\, charge and spin density waves. Ev en without nematic order arising in a system\, nematic fluctuations can hav e strong effects on material properties. I will give a brief introduction t o electronic nematicity and follow up by discussing some commonly used stra in techniques."



    In-Person Locati on: Toll Physics Room # 1201
    Time: 4pm -5:30pm LAST-MODIFIED:20220209T170217Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Danila Sokratov TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T193000Z DTEND:20220504T203000Z DTSTAMP:20260828T094430Z UID:79ph1afj5179mi2462d6tsk8k5@google.com CREATED:20220429T154303Z DESCRIPTION:

    Join from the meeting link

    https://lpscp.webex.com/lp scp/j.php?MTID=mc334dc03f4f334d9d8e1bcb4b3a37a70

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    Meeting number (access code): 2631 256 5524< /td>

    Meeting password: vaXkUyJd753 \;

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    Tap to join from a mobile devic e (attendees only) \;
    +1-408-418-9388\,\,26312565524##&nb sp\;United States Toll \;

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    Exploring transformative startup solutions for magnetically confined fusio n plasmas

    Stephanie Diem\, \; University of Wisconsin

     \;
    Abstract : The potential to use fusion as a carbon-free\, fuel-abundant energy source to meet the world's growing energy demands ha s motivated significant US and international research. One research path to wards the realization of fusion energy involves tokamaks that magnetically confine hot plasmas in the shape of a torus. Almost every tokamak fusion reactor in the world relies on magnetic induction from a central solenoid to drive the current necessary to create a fusion grade plasma. Minimizing or completely eliminating the need for a central solenoid in a tokamak wo uld greatly simplify the construction and reduce the cost of these device s\, increasing their viability for commercial energy production. Solenoid- free startup techniques such as helicity injection (HI) and radiofrequency (RF) wave injection offer the potential of reducing the technical require ments of\, or possibly the need for\, a central solenoid. A major upgrade is underway for the spherical tokamak facility\, Pegasus-III at the Univer sity of Wisconsin-Madison. The new facility will provide a dedicated US pl atform to study innovations in plasma startup techniques\, allowing for st udies of both HI and RF during plasma initiation\, ramp-up and sustainment . Experimental plans for RF heating and current drive in OA the microwave r ange of frequencies will be presented. The new capabilities of the Pegasus -III facility will provide a bold test of the viability of a non-solenoidal compact tokamak using reactor relevant techniques.

    Marc Swisdak\, swisdak@umd.edu \;

    LAST-MODIFIED:20220429T154344Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210503T203000Z DTEND:20210503T213000Z DTSTAMP:20260828T094430Z UID:7h2oj31ch5fepk0mke1s3p1843@google.com CREATED:20210331T191139Z DESCRIPTION:Title: Studies of Transient Astronomical Events with the Lowell Discovery Telescope

    Speaker: Joe Durbak\, Department of Physics\, U niversity of Maryland

    Abstract: Since the discovery of gamma ray bur sts (GRBs) the necessity of new tools to observe events across the electrom agnetic spectrum has become increasingly apparent. The discovery of gravita tional waves (GWs) precipitating multi-messenger astronomy has made this ev en more true today. With the versatility of the Lowell Discovery Telescope (LDT)\, our collaboration between UMD\, NASA GSFC and Lowell Observatory has been able to both quickly respond to and use these transient events to explore the universe in greater detail. Our research group is also working to develop novel instruments to aid our observations in the near infrared\, and is improving software to analyze data in both the optical and infrared .

    Notes: Visit \;https://bit.ly /2PmJoT6 \;for access LAST-MODIFIED:20210426T191231Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210506T210000Z DTEND:20210506T220000Z DTSTAMP:20260828T094430Z UID:39el3hsa60h3tltordh813f1f9@google.com CREATED:20210503T135701Z DESCRIPTION:

    Title: Quantum accelerators: a new trajectory for quant um computers
    Speaker: Dr Marcus Doherty
    Affiliation: Quantum B rilliance



    Time: Thursday\, May 6 a t 5pm



    Zoom Link: https://umd.zoom.us/j/95285740962


    Bio and abstract: Marcus is recogniz ed as a principal contributor to the emergence of diamond-based quantum tec hnologies\, including quantum microscopy\, quantum computing and quantum co mmunications. These technologies represent new paradigms of microscopy\, co mputing and communications that have the potential to revolutionize many di sciplines of science and technology. During this seminar Marcus will share more about how the industry can expand the vision for quantum computing.     LAST-MODIFIED:20210503T135721Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T160000 DTEND;TZID=America/New_York:20211122T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211214;BYDAY=MO EXDATE;TZID=America/New_York:20211213T160000 EXDATE;TZID=America/New_York:20211206T160000 EXDATE;TZID=America/New_York:20211129T160000 DTSTAMP:20260828T094430Z UID:jkjo24susmror8foduuc6t6h2e@google.com CREATED:20210924T114034Z DESCRIPTION:Speaker 1: Heshan Yu\n\nTitle: TBD\n\n\n\nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20211111T142040Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Heshan Yu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210209T181500Z DTEND:20210209T191500Z DTSTAMP:20260828T094430Z UID:56fjt7d9m2ijsn4i08trflbo2p@google.com CREATED:20210202T174945Z DESCRIPTION:Speaker: Mr. Jesse Prelesnik (Ph.D student)\, University of Was hington

    Title: \; Specific Ion Effects at Interfaces: Modulating Macromolecule Binding and Facilitating Charge Transfer

    Abstract: My Ph.D research focuses on multi-component soft matter systems\, which prese nt a unique challenge in statistical physics due to the deviations from bul k behavior that occur at heterogeneous interfaces. Small molecule or atomic ions are ubiquitous in these types of systems and can qualitatively alter assembly or transport phenomena\, even for ions close to one another in the Hofmeister series. In this talk\, I will discuss two case studies involvin g multi-scale modeling of chemical systems: (1) macromolecule adsorption to templating surfaces and (2) facilitated intermolecular charge transfer in organic semiconductors. For each\, I will overview experimental challenges in interrogating the mechanisms that underlie the dramatic differences obse rved in assembly and dynamical outcomes\, respectively\, and then illustrat e how a multi-faceted theoretical framework (utilizing molecular dynamics\, density functional theory\, and electrostatic theory) can reveal driving i nteractions. Finally\, a closed-loop experimental/theoretical framework is given to provide an avenue for validation and guide the systems chosen for further study.

    Below is the ZOOM seminar link.

    ZOOM: \; https://go.umd.edu/st atphys_spring2021

    LAST-MODIFIED:20210202T174945Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20200217T180000Z DTEND:20200217T190000Z DTSTAMP:20260828T094430Z UID:69h32cpl6pgj8bb4chh3ib9k69ij2bb264sj2b9l6sq64c1j74q6ac9i6o@google.com CREATED:20200212T183945Z DESCRIPTION:Sasha Philippov\, Flatiron Institute LAST-MODIFIED:20210226T031303Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211123T160000 DTEND;TZID=America/New_York:20211123T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211123T160000 CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221130T203000Z DTEND:20221130T223000Z DTSTAMP:20260828T094430Z UID:1c8u1f02noh8cdc0ir4t71tps0@google.com CREATED:20220815T131634Z DESCRIPTION:Speaker: MatES

    Title: TBA

    Abstract: TBA LAST-MODIFIED:20220815T131634Z LOCATION:Event held in The Forum Clark Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T220000Z DTEND:20220330T005000Z DTSTAMP:20260828T094430Z UID:5rc784rf62l1oencidh5i0nmlf@google.com CREATED:20220210T145705Z DESCRIPTION:Dianna Abney presents the film Co ntagion as part of the Science and Society via Film course. All are wel come. For information and the entire semester's schedule\, see the course w ebsite: htt ps://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145705Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contagion TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220831T193000Z DTEND:20220831T213000Z DTSTAMP:20260828T094430Z UID:50966dj90isakmr1uklk5ihg8a@google.com CREATED:20220815T125501Z DESCRIPTION:Speaker: Dr. Zachary Robinson\, Associate Professor\ , Department of Physics\, SUNY Brockport

    Title: \;The Surface Sc ience of Growing 2D Materials


    Abstract: G raphene\, which is an atomically thin layer of graphite\, was first isolate d in 2004 by a research group at the University of Manchester. The discover y initiated a massive research effort into 2-dimensional materials\, which have the potential to enable significant improvements in fields like high s peed electronics\, flexible electronics\, transparent conductors\, biologic al sensors\, and others. Key to enabling future technology is understanding the physical properties and growth processes of the 2-dimensional material s. Graphene\, for instance\, can be grown by a variety of different techniq ues. Sublimation of Si from SiC and chemical vapor deposition on Cu are two such growth techniques\, both of which are promising due to their ability to be scaled up to a manufacturing environment. In this talk\, I will intro duce some of the techniques used by surface scientists as they apply to my research studying the physical properties of the 2-dimensional material gra phene. As time allows\, I will also discuss some more recent work on materi als relevant for neuromorphic computing\, including a new optical spectrosc opy instrument that we developed for measuring optical properties in ultra- high vacuum.



     LAST-MODIFIED:20220815T125607Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210125T210000Z DTEND:20210125T220000Z DTSTAMP:20260828T094430Z UID:49335otvnrb6gaot5qd9io1n2d@google.com CREATED:20210111T165205Z DESCRIPTION:

    Title: \;Learning Principles of Genome Structure and Function from Minimalist 3D Polymer Models: Self-Avoidance\, Volume Confinement\, and Biological Interactions.

    Speaker: \;Jie Liang\, University of Illinois at Chicago  \;

    Hosted by: \;Pratyush Tiwary

    Abstract: \;

    3D organization of chromosomes in cell n ucleus play important roles in genome functions.  \;Essential informati on on chromatin structure has been gathered\, largely from chromosome confo rmation capture (Hi-C)\, the experimental technique that measures pairwise interactions between genomic regions.  \;Here we demonstrate how a mini malist 3D polymer model of chromatin can shed light on principles of genome organization. \;Our minimalist models are based on basic properties th at 3D chromatin conformations: \;1) must be self-avoiding\, and satisfy 2) the constraint of cell nuclei volume and 3) the constraints from a smal l set of biological interactions (<\;5-13%). \;To obtain correctly pa cked 3D chromatin polymer conformations in confined nucleus volume\, we hav e overcome technical challenges and developed deep sampling methods. \; These methods allow us to generate \;properly-sampled large ensembles of 3D chromatin conformations. \; Our minimalist models can explain: a) the physical basis of scaling relationship such as contact probability of two regions and their genomic separation\, b) the origin of the structures of topologically-associating domains. \; Without invoking any adjustabl e parameter\, our model can also c) fold chromatin chains into 3D conformat ions using the small set of biological interaction\, achieving high accurac y (R=0.96-0.97). The single-cell 3D chromatin conformations in our model en semble d) are in excellent agreement with single-cell experimental measurem ents\, and e) can quantitatively characterize chromatin heterogeneity.  \; We further discuss novel biological findings relating genome structures and genome function. \; These include orchestrated changes in chromatin heterogeneity during Drosophila embryogenesis\, \;prominence of functi onal hubs of higher-order many-body interactions\, their global landscape i n active genomic regions\, as well as the 1D signature of epigenetic modifi cations of many-body interactions as identified by machine learning. (See&n bsp\;https://rdcu.be/cdgFv \;for a recent publication).

    LAST-MODIFIED:20210111T165343Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220223T160000Z DTEND:20220223T170000Z DTSTAMP:20260828T094430Z UID:7n80b9quav42vc36pn5v7fi47v@google.com CREATED:20220207T162642Z LAST-MODIFIED:20220207T162642Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR (BPS Meeting) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210913T190000Z DTEND:20210913T203000Z DTSTAMP:20260828T094430Z UID:0kok04iqoavq0s7n4tg5i43216@google.com CREATED:20210805T130416Z DESCRIPTION:Speaker: Jose Luis Bernal\, Johns Hopkins University\n\n\nTitle : Using line-intensity mapping to look for exotic radiative decays\n\nAbstr act: Line-intensity mapping (LIM) experiments use the integrated intensity at a given frequency\, targeting well-known spectral lines to infer the red shift of the signal and build three-dimensional maps of cosmic volumes. Sin ce these surveys exploit the information from all incoming photons\, they h ave the potential to directly observe the electromagnetic radiation produce d in exotic radiative decays\, as it would be the case of decaying dark mat ter or decays of neutrinos in the cosmic neutrino background. In both cases \, the exotic radiation will be detected as a line interloper of astrophysi cal spectral lines. I will discuss realistic and efficient strategies to de tect radiative products from exotic decays from a phenomenological approach \, focusing on the LIM power spectrum and the voxel intensity distribution\ , with an extra anisotropy and a narrowing and a shift of the distribution towards higher intensities as the most significant signatures\, respectivel y. I will show forecast sensitivities for the specific cases of axion dark matter decays and neutrino decays\, discussing implications and comparisons with alternative methods\, and highlighting the promise of LIM to contribu te to indirect dark matter searches and studies of the neutrino properties. LAST-MODIFIED:20210907T133041Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201027T160000 DTEND;TZID=America/New_York:20201027T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201027T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording:
    https://umd.zoom.us/rec/share/e2dYbaALpH7qitE9kjHEXrK fzIHKpTWOhVz01amgnZCqz3HSUQB_7LdwLYb_zSpB._CiVsDyYsRLSWS8N

    Access Passcode: P2xley4* \; \;
    Speaker: Dr. Jed Pix ley

     \;Zoom Meeting: https://umd.zoom.us/j/91028719339?pw d=MWVqT3Q0Uk0ya0V5VmlaZEp0N2VwUT09

    Meeting ID: 910 2871 9339 Pa sscode: 89593

    Twistronics in solid-state devices and beyond

    Jed H Pixley

    The ability to control and manipu late the strength of correlations in quantum matter is one of the central q uestions in condensed matter physics today. While pressure\, chemical dopin g\, or a magnetic field have served as conventional tuning knobs for a wide class of correlated systems\, the ability to twist van der Waals materials has recently emerged as a novel scheme to engineer strong correlations and tune electronic properties. In the case of twisting two sheets of graphene \, at a particular "magic-angle\,’’ the kinetic energy of electronic degree s of freedom is expected to vanish\, and as a result\, interaction effects should dominate. This has now been demonstrated experimentally following th e recent discovery of superconductivity in close proximity to correlated in sulating phases in magic-angle graphene. These results have now been reprod uced by a number of experimental groups and extended to other two-dimension al van der Waals materials.

    In this talk\, I will discuss our theory that describes the magic-angle phenomena as a universal property of Dirac p oints in an incommensurate potential. As a result\, we will discuss the gen eralization of the magic-angle effect to a wide class of models and distinc t physical settings\, such as ultra-cold atomic gases\, trapped ions\, and metamaterials. It will be shown that the magic-angle in twisted bilayer gra phene is\, in fact\, a single particle quantum phase transition that can be described by adelocalization transition in momentum space with multifracta l wave functions akin to electrons in a magnetic field and the celebrated H ofstadter's butterfly. The effects of correlations will be considered by co nstructing effective Hubbard models with dramatically enhanced interactions due to this novel quantum phase transition.

    LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T200000Z DTEND:20220207T213000Z DTSTAMP:20260828T094430Z UID:5cfkebfejek73gj2fi2u0etkbt@google.com CREATED:20220131T160248Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Daniel Green\, UC San Diego

    Title: Non-Gaussianity in Maps of the La rge Scale Structure


    Abstract: Equilateral non-Gaussianity is a c ompelling observational target for CMB and LSS surveys. Unfortunately\, pr ogress in measuring non-Gaussianity is expected to be limited by our abilit y to accurately model the distribution of galaxies in the universe. In this talk\, I will discuss how these challenges could be overcome using the ful l maps of large scale structure. I will explain how the special nature of the equilateral signal protects it from being corrupted by nonlinear evolut ion. This suggests that a map level approach to LSS could dramatically imp act the search for primordial non-Gaussianity.

    For zoom link please email mknouse@umd.edu     LAST-MODIFIED:20220131T160248Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210428T150000Z DTEND:20210428T160000Z DTSTAMP:20260828T094430Z UID:58p9fpsqu73b9n06l1875m62lc@google.com CREATED:20210322T144347Z DESCRIPTION:Speaker: Brenda Rubenstein\, Joukowsky Family Assistant Profess or of Chemistry\, Brown University\n\nTitle: Computing with Molecules: Stor age and Computation Using Small Molecules and Their Reaction Networks\n\nAb stract: As transistors near the size of molecules\, computer engineers are increasingly findingthemselves asking a once idle question: how can we comp ute using chemistry? In this talk\, I\nwill discuss recent progress my Brow n Molecular Informatics team and I have made\ndemonstrating how mixtures of small\, unordered molecules can process information. During the\nfirst por tion of this talk\, I will illustrate how combinatorial chemical synthesis combined with high\nresolution mass spectrometry can be harnessed to store GBs of information in small molecules\nand metabolites. I will then turn to describing how basic principles of chemistry can be exploited\nto realize fully molecular neural networks for machine learning and image processing. I will end\nwith a discussion of the challenges molecular computation faces that may be resolved with\nclever doses of synthetic and theoretical chemi stry\, and the connections molecular computation\nhas to the field of syste ms chemistry. LAST-MODIFIED:20210420T180323Z LOCATION:Zoom: go.umd.edu/pchem_spring2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201020T160000 DTEND;TZID=America/New_York:20201020T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201020T160000 CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T173000Z DTEND:20220401T183000Z DTSTAMP:20260828T094430Z UID:3glinubgl8r3q22slq20nk54gj@google.com CREATED:20220328T164812Z DESCRIPTION:Disorder-induced topology and more surpris es from synthetic quantum matter

    Bryce Gadway\, University of Il linois

    Artificial materials made up of atoms\, molecules\, and li ght have opened up exciting opportunities to explore quantum physics in exo tic regimes. Through their manipulation with laser light and other fields\, ultracold gases of atoms and molecules can be used to study phenomena rela ted to condensed matter\, high energy\, and nuclear physics\, and can furth ermore play host to entirely unique kinds of many-body effects. In this tal k\, I'll describe how recent approaches based on the use of ``synthetic dim ensions\,'' where dynamics occur in a space relating to internal or other a uxiliary degrees of freedom\, have opened up new capabilities for the study of topology and localization physics. As one example\, I'll describe how t he addition of disorder to a synthetic atomic wire leads to the surprising appearance of nontrivial topological properties. Looking ahead\, I'll discu ss out how extensions to the synthetic dimensions approach with atoms\, mol ecules\, and other platforms promise to introduce new kinds of exotic many- body states and phenomena in the years to come.

    LAST-MODIFIED:20220328T165106Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211019T170000Z DTEND:20211019T180000Z DTSTAMP:20260828T094430Z UID:2gdah8nga3j89g7v6me2rkb7q6@google.com CREATED:20210914T151748Z LAST-MODIFIED:20210914T151748Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210312T180000Z DTEND:20210312T190000Z DTSTAMP:20260828T094430Z UID:0m896er9c68va87k1kbm2qsits@google.com CREATED:20210202T140415Z DESCRIPTION:Speaker: Dongwon Shin\, R&\;D Staff Scientist\, Materials Sc ience &\; Technology DivisionOak Ridge National Laboratory

    Title:  \;Applying Data Analytics to Materials Science and Engineering: \; What Is (Not) Possible and What Is Needed? \;

    Abstract: Emerging data analytics techniques certainly have brought high anticipation to sign ificantly accelerate the research and development of many scientific discip lines\, including materials science. Contrary to such optimistic expectatio ns\, most of the domain scientists\, particularly those who do not have a s trong background in data science\, have questions regarding the deployment of new tools: What can be practically achieved with Al/machine learning\, a nd what are prerequisites? This presentation will attempt to answer these t wo critical questions in three aspects: 1) preparing datasets constituted w ith clear input and output\, 2) analyzing the correlation between input fea tures and target properties to generate/validate scientific research hypoth eses\, and 3) performing data analytics. An easy-to-use open-source fronten d recently developed by Oak Ridge National Laboratory will be used to analy ze the correlation\, train machine learning models\, and make predictions w ith trained surrogate models. The examples to be introduced include mechani cal and oxidation properties of high-temperature alloys\, thermochemical an d thermophysical properties of complex oxides\, and vapor processing condit ions computed from high-throughput computer fluid dynamics simulations perf ormed on a world-class supercomputer. \;

    via Zoom
    Sherri Tatu m
    statum12@umd.edu
    https://mse.umd.edu/seminar-serie s \; \; LAST-MODIFIED:20210202T140415Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210302T181500Z DTEND:20210302T191500Z DTSTAMP:20260828T094430Z UID:5ol6jki4eb7l7spovqno0sl446@google.com CREATED:20210202T175606Z DESCRIPTION:Speaker: Dr. Pavel Chvykov\, MIT

    Title: \; Low Ratt ling: A Predictive Principle for Self-organization in Active Collectives&nb sp\; \;

    Abstract: \;Self-organization is frequently observed in active collectives as varied as ant rafts and molecular motor assemblie s. General principles describing self-organization away from equilibrium ha ve been challenging to identify. We offer a unifying framework that models the behavior of complex systems as largely random while capturing their con figuration-dependent response to external forcing. This allows derivation o f a Boltzmann-like principle for understanding and manipulating driven self -organization. We validate our predictions experimentally\, with the use of shape-changing robotic active matter\, and outline a methodology for contr olling collective behavior. Our findings highlight how emergent order depen ds sensitively on the matching between external patterns of forcing and int ernal dynamical response properties\, pointing toward future approaches for the design and control of active particle mixtures and metamaterials.
    < br>

    Below is the ZOOM seminar link.

    ZOOM: \;https://go.umd.edu/statphys_spring2021

    LAST-MODIFIED:20210202T175808Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T160000Z DTEND:20211201T171500Z DTSTAMP:20260828T094430Z UID:581uk9eok9dashf4rfg9cq28it@google.com CREATED:20210914T160029Z DESCRIPTION:Speaker: Sergei Tretiak\, LANL - \;https://www.lanl.g ov/search-capabilities/profiles/sergei-tretiak.shtml

    Title:  \;The Rise of Neural Networks for Materials and Chemical Dynamics

    Ab stract: Machine learning (ML) is quickly becoming a premier toolfor modelin g chemical processes and materials. Generally\, ML provides asurrogate mode l trained on the dataset of some reference data. This modelestablishes a re lationship between structure and underlying chemicalproperties\, guiding ch emical discovery. Designing high-quality training datasets is crucial to ov erall model accuracy. To address this this problem\, I willdescribe the act ive learning strategy\, in which new data are automaticallycollected for at omic configurations that produce large ML uncertainties. Thelocality approx imation underpinning favorable computational scaling of the MLmodels\, is a nother severe limitation that fails to capture long-range effectsthat may a rise from charge transfer\, polarization\, electrostatic or dispersioninter actions. I will also discuss how ML models can overcome nonlocality (via in troductionof interaction layers\, self-consistent cycles\, or charge equili bration schemes)and exemplify their performance for chemical problems with nonlocalities. Allthese advances are exemplified by applications to molecul es and materials.Exciting new method development and explosive growth of us er-friendly MLframeworks\, designed for chemistry\, demonstrate that the fi eld is evolvingtowards physics-based models augmented by data science.  \;

    References:

    1. J. S. Smith\, B. Nebgen\, N. Mathew\, J. C hen\, N. Lubbers\, L. Burakovsky\, S. Tretiak\, H. Ah Nam\, T. Germann\ , S. Fensin\, K. Barros\, “Automated discovery of a robust interatomic p otential for aluminum” Nature Comm. 12\, 1257 (20 21).
    2. A. E. Sifain\, L. Lystrom\, R. Messerly\, J. S. Smith\, B . Nebgen\, K. Barros\, S. Tretiak\, N. Lubbers\, and B. J. Gifford\, “Predicting Phosphorescence and Inferring Wavefunction Localization wi th Machine Learning\,” Chem. Sci.\, 12\, 10207 – 10217 (2021).
    3. R. Zubatyuk\, B. Nebgen\, J. S. Smith\, S. Treti ak and O. Isayev\, “Teaching neural network to attach and detach ele ctrons from molecules” Nature Comm. 12\, 4870 (2021).
    4. M. Kulichenko\, J. S. Smith\, B. Nebgen\, N. Fedik\, A. I. Boldyr ev\, N. Lubbers\, K. Barros and S. Tretiak\, “The rise of neural networks for materials and chemical dynamics\,” J. Phys. Chem. Lett. (Perspectives\, journal cover page) 12\, 6227 – 6244 (2021 ).

     \;

    Zoom location: \;https://umd.zoom.us /j/96861546458?pwd=ZzhtdmF6K1oxZGgxWWQ2R1RhNkJ2QT09

    Meeting ID : 968 6154 6458
    Passcode: 120121

    LAST-MODIFIED:20211123T123300Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T160000Z DTEND:20211117T171500Z DTSTAMP:20260828T094430Z UID:5272pbj957396kjeo3vosfi9bl@google.com CREATED:20211115T155147Z DESCRIPTION:Title: A review and recent progress in quantum error - mitigat ion\nSpeaker: Kristan Temme (IBM)\nTime: Wednesday\, November 17\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/6803241833\n\nNe ar-term applications of early quantum devices\, such as quantum simulations \, rely on accurate estimates of expectation values to become relevant. Dec oherence and gate errors lead to wrong estimates. This problem was\, at lea st in theory\, remedied with the advent of quantum error correction. Howeve r\, the overhead that is needed to implement a fully fault-tolerant gate se t with current codes and current devices seems prohibitively large. In tur n\, steady progress is made in improving the quality of the quantum hardwar e. This leads to the question: what computational tasks could be accompli shed with only limited\, or no error correction? In this talk we first revi ew two simple techniques for quantum error mitigation that increase the qua lity of short-depth quantum simulations. The first method\, extrapolation to the zero noise limit\, subsequently cancels powers of the noise perturb ations by an application of Richardson’s deferred approach to the limit. Th e second method cancels errors by resampling randomized circuits according to a quasi-probability distribution. The two schemes are presented and we w ill discuss their application in recent experiments. Furthermore we will di scuss recent progress on applying error mitigation techniques to logical qu bits that don't support a universal gate set and show how to implement enco ded Clifford+T circuits. Here the Clifford gates are protected from noise b y error correction while errors introduced by noisy encoded T-gates are mit igated using the quasi-probability method. As a result\, Clifford+T circuit s with a number of T-gates inversely proportional to the physical noise rat e can be implemented on small error-corrected devices without magic state d istillation. LAST-MODIFIED:20211115T155147Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/6803241833 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Kristan Temme TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220315T150000Z DTEND:20220315T160000Z DTSTAMP:20260828T094430Z UID:5m4352sg887n0pp74uroqnpntn@google.com CREATED:20220207T174913Z DESCRIPTION:Speaker: Dr. Nathan Baird\, University of the Scienc es

    Title: Dynamic Intramolecular RNA Triplexes: Transcript Stability Elements and Small Molecule Targets


    Abstract: \;https://chem.umd.edu /events/speaker-nathan-baird     LAST-MODIFIED:20220307T152803Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210201T160000 DTEND;TZID=America/New_York:20210201T170000 DTSTAMP:20260828T094430Z UID:4vcrk9f2lccfvtoaltqhlruo2j@google.com RECURRENCE-ID;TZID=America/New_York:20210201T160000 CREATED:20210105T172544Z DESCRIPTION:Seminar will be conducted via zoom

    Speaker: Andrea Tesi \, Florence University

    Title: Gravitational Production of a Conforma l Dark Sector

    Abstract: Dark sectors with purely gravitational coupl ings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange\, and naturally provide DM candidates. We examine the pro duction in the relativistic regime where the dark sector is approximately s cale invariant\, providing general analytical formulas that depend solely o n the central charge of the dark sector. We then assess the relevance of in teractions that can lead to a variety of phenomena including thermalisation \, nonperturbative mass gaps\, out-of-equilibrium phase transitions and can nibalism in the dark sector. As an illustrative example we consider the dar k glueball scenario in this light and show it to be a viable DM candidate d ue to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large-N wi th the dark dilaton as the DM candidate.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210125T115513Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211209T160000Z DTEND:20211209T170000Z DTSTAMP:20260828T094430Z UID:7ukdipgmfpgp48gp5o8iqec3hr@google.com CREATED:20211117T152419Z DESCRIPTION:Speaker: Cole Miller\, UMD\n\nTitle: Learning about dense matte r from astronomical observations\n\nAbstract: In the last decade\, a series of astronomical measurements has provided outstanding new insight into the properties of the dense\, cold matter in the cores of neutron stars. Thes e include precise measurements of the masses of three ~2 Msun neutron stars \, tidal deformability constraints from the gravitational wave event GW1708 17\, and measurements of the radii of two neutron stars using data from NAS A's NICER satellite. I will discuss these measurements\, and will focus in particular on our group's work on NICER pulsars. I will also discuss the implications of our results for the properties of the dense matter in the c ores of neutron stars. LAST-MODIFIED:20211202T181950Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220818T190000Z DTEND:20220818T200000Z DTSTAMP:20260828T094430Z UID:7jboofpb5jnjreqnem099l8vp0@google.com CREATED:20220812T153911Z DESCRIPTION:
    Title: A trapped ion quantum simulator for two-dimensional spin system \;

    Speaker: Yuanheng Xie\, Indiana University\, Bloo mington
    Date: Thursday\, 8/18/22
    Time: 3pm
    Location: PSC 1136
    Z oom: \;https://umd.zoom.us/ j/97322138531

    Abstract:

    Quantum simulations of compl ex materials address fundamental problems that cannot be analytically solve d due to the exponential scaling of the Hilbert space with increasing parti cle number. Simulations using trapped ions have had remarkable success inve stigating one-dimensional quantum interacting spin models\, and we seek to extend these ideas to two dimensions by exploiting new crystal geometries i n a rf Paul trap. This 2d quantum simulation will allow us to address open questions related to geometric frustration\, ground states and dynamics of long-range spin models\, and quantum spin liquids. To characterize the vari ety of different ion geometries\, we present an experimental study which es tablishes radial-2D crystals as a robust platform for quantum simulation\, through characterization of ion positions\, structural phases\, normal mode frequencies\, and effects from rf heating. What’s more\, we examine other challenges faced by trapped ion systems: optimally cooling to the motional ground state\, accurately determining ion temperature\, and measuring susce ptibility to the presence of ionizing radiation. \; LAST-MODIFIED:20220812T153911Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Yuanheng Xie TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210405T203000Z DTEND:20210405T213000Z DTSTAMP:20260828T094430Z UID:24tmdtlsokk3ii6j7stjbpc2ff@google.com CREATED:20210208T034654Z DESCRIPTION:Title: Search for Ultra-High Energy Cosmic Rays from Space: cha llenges and perspectives

    Speaker: Mario Bertaina\, University of Tor ino\, Italy

    Abstract: The origin and nature of Ultra-High Energy Cos mic Rays (UHECRs) remain unsolved in contemporary astroparticle physics. To give an answer to these questions is rather challenging because of the ext remely low flux of a few per km^2 per century at extreme energies (i.e. E & gt\; 5x10^19eV). A super-wide-field telescope looking down from space onto the night sky to detect UV photons emitted by Extensive Air Showers (EAS) g enerated by UHECRs in the atmosphere might provide an effective solution to this difficulty. However\, such a measurement has to deal with several cha llenges compared to a ground-based observation. During this seminar a revie w of the main open points in UHECR science\, the observational techniques e mployed to detect EAS and of the challenges and methodology of their observ ation from space will be reviewed. The JEM-EUSO program will be used as a c ase study to learn how to move from a conceptual study to a real mission by means of different technological achievements from ground\, on stratospher ic balloons and from space.

    Visit \;https://bit.ly/2PmJoT6 \;for access.  \;Join at 4:15 for m eet and greet. LAST-MODIFIED:20210208T034654Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211108T110000 DTEND;TZID=America/New_York:20211108T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211108T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Kanu Sinha\, \;Princeton University

    Title: \;Engineering Atom-Field interactions in Nanoscale Quantum Op tical Systems \;
    Abstract: \;

    Interactions between atom s and electromagnetic fields are at the core of nearly all quantum devices\ , with applications ranging from building quantum computers and networks\, communicating quantum information over long distances\, and developing quan tum sensors of increasing precision. The miniaturization of these systems i s critical to increasing their modularity as well as improving the efficacy of light-matter interactions by confining electromagnetic fields in small volumes. Thus atom-field interactions at nanoscales become a pivotal aspect of understanding and designing novel photonic devices. \;

    In this t alk\, I will discuss two specific challenges relevant to nanoscale quantum optical sys tems and ways to engineer them: (1) Fluctuation phenomena – For ces\, dissipation and deco herence induced by fluctuations of the electroma gnetic field limit the control and coherence of quantum systems at nanoscal es. I will present an overview of ways to engineer fluctuation phe nomena i n nanophotonic systems\, and discuss specifically how collective effects ca n be used to tailor fluctuation-induced forces between atoms and surfaces. (2) Collective atom-field interactions over long distances – Distant correl ated atoms coupled via waveguides can exhibit surprisingly rich non-Markovi an dynamics arising from the memory effects of their intermediary electroma g netic environment. I will discuss how such a system demonstrates collecti ve spontaneous emission rates exceeding those of Dicke superradiance (‘supe rduperradiance’)\, formation of macroscopically delocalized atom-photon bou nd states and limitations on long-distance quantum information proto cols. These ideas pave way for building novel efficient light-matter interfaces a nd scalable quantum devices with long distance correlated quantum systems.< /b>

    Host: Charles Clark LAST-MODIFIED:20220617T080648Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210218T140000 DTEND;TZID=America/New_York:20210218T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201202T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:1dsivltk7ered9v2oab7rhsl08@google.com CREATED:20210125T181305Z DESCRIPTION:Speaker: Matthew S. Foster\, Rice University\n\nTitle: TBA\nAbs tract:\n\n\nHost: Anlage\nFor the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210125T181305Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Matthew S. Foster\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210222T210000Z DTEND:20210222T220000Z DTSTAMP:20260828T094430Z UID:4vfgojfg5k3bkbedt9bg58mrj1@google.com CREATED:20210108T221459Z DESCRIPTION:Marilena Loverde\, Stony Brook University\n\nTitle: New techniq ues for new physics in large-scale structure\n\nAbstract: The large-scale s tructure of our universe contains a wealth of information about the origin\ , evolution\, and matter content of the universe. Extracting this informati on relies crucially on understanding how observables -- galaxies\, voids\, and the large-scale matter distribution -- preserve this information. I wil l describe new tools for modeling large-scale structure in the presence of new physics and present two new observables\, constructed from the probabil ity distribution of matter and galaxy fluctuations\, that can be used to pr obe structure formation and cosmology.\n\nFor zoom link please email mknous e@umd.edu LAST-MODIFIED:20210222T140641Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 DTSTAMP:20260828T094430Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220303T123000 CREATED:20220209T173542Z DESCRIPTION:

    Speaker: Jack Holligan\, UMD

    T itle: \;Symplectic Yang-Mills on the lattice

    Seminar will also be streamed live via zoom: \; \;https://umd.zoom.us/j/94067038750     LAST-MODIFIED:20220301T151454Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T173000Z DTEND:20220504T183000Z DTSTAMP:20260828T094430Z UID:2cof92cj43lk6uingt0n0vmb9b@google.com CREATED:20220413T135948Z DESCRIPTION:

    Preceded by lunch at 12:30pm

    Speaker: Raman Sundrum\, UMD

    Title:  Sleptonic SUSY

    Abstract: We study an attractive scenario\, ``Sleptonic SUSY''\, whi ch reconciles the 125 GeV Higgs scalar and  
    the non-observation of su perpartners thus far with
    potentially pivotal roles for slepton phenom enology:
    providing viable ongoing targets for LHC discovery\, incorpor ating
    a co-annihilation partner for detectable thermal relic dark matt er\,
    and capable of mediating  the existing muon $g-2$ anomaly.
    < u>     LAST-MODIFIED:20220503T175348Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211213T110000 DTEND;TZID=America/New_York:20211213T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211213T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Leah Dodson\, Department of Chemistry and Biochemistry \, UMCP

    Title: New Technology for Exploring State-Dependent Reactivi ty in Radiative Association Reactions

    Abstract: \;Recent advance s in investigating radiative association (RA) reactions by quantum dynamics methods have revealed troubling discrepancies when compared with the react ion rates obtained using statistical methods\, sometimes differing by up to four orders of magnitude. Notoriously difficult to measure in the laborato ry\, RA experiments are necessary to test the application of theoretical mo dels to real systems. A new laboratory effort is being undertaken in the Ch emistry Department at UMD to develop the tools necessary to experimentally measure rate constants for RA reactions at temperatures relevant to the int erstellar medium (down to 10 K). The instrument combines a cryogenic buffer -gas beam with a cryogenic ion trap in order to investigate ion/molecule RA reactions as a function of temperature. In this talk\, I will describe our progress toward the development of an instrument capable of directly measu ring the temperature-dependent reactivities with the immediate goal of meas uring the rate constants for a series of RA reactions between magnesium mon ocations (Mg+) and cyanopolyyne (HC2n+1N\,&n bsp\;n \;= 0–3) neutral molecules. These experiments will shed light on disagreement between theoretical RA studies\, while also providin g experimentally-measured rate constants for reactions that are relevant to astrochemistry.

    Host: Charles Clark LAST-MODIFIED:20220617T080540Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220127T190000Z DTEND:20220127T200000Z DTSTAMP:20260828T094430Z UID:4fgpd46grl930akcp7agghb28i@google.com CREATED:20220122T021009Z DESCRIPTION:Title: A direct product theorem for quantum communication comp lexity with applications to device-independent QKD\nSpeaker: Srijita Kundu (University of Waterloo)\nTime: Thursday\, January 27\, 2022 - 2:00pm\nLo cation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/98736830982?pwd=d212 aDVlZU8vaHUxTkJkeWVFSGRLZz09\n\nWe give a direct product theorem for the en tanglement-assisted interactive quantum communication complexity in terms o f the quantum partition bound for product distributions. The quantum partit ion or efficiency bound is a lower bound on communication complexity\, a no n-distributional version of which was introduced by Laplante\, Lerays and R oland (2012). For a two-input boolean function\, the best result for intera ctive quantum communication complexity known previously was due to Sherstov (2018)\, who showed a direct product theorem in terms of the generalized d iscrepancy. While there is no direct relationship between the maximum distr ibutional quantum partition bound for product distributions\, and the gener alized discrepancy method\, unlike Sherstov’s result\, our result works for two-input functions or relations whose outputs are non-boolean as well.\n\ nAs an application of our result\, we show that it is possible to do device -independent quantum key distribution (DIQKD) without the assumption that d evices do not leak any information after inputs are provided to them. We an alyze the DIQKD protocol given by Jain\, Miller and Shi (2020)\, and show t hat when the protocol is carried out with devices that are compatible with several copies of the Magic Square game\, it is possible to extract a linea r (in the number of copies of the game) amount of key from it\, even in the presence of a linear amount of leakage. Our security proof is parallel\, i .e.\, the honest parties can enter all their inputs into their devices at o nce\, and works for a leakage model that is arbitrarily interactive\, i.e.\ , the devices of the honest parties Alice and Bob can exchange information with each other and with the eavesdropper Eve in any number of rounds\, as long as the total number of bits or qubits communicated is bounded.\n\nBase d on https://arxiv.org/abs/2106.04299\, which is joint work with Rahul Jain . LAST-MODIFIED:20220122T021009Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/98736830982?pwd=d212 aDVlZU8vaHUxTkJkeWVFSGRLZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Srijita Kundu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210924T160000Z DTEND:20210924T164500Z DTSTAMP:20260828T094430Z UID:2epart1i919apop39ra990k49h@google.com CREATED:20210916T184344Z DESCRIPTION:Title: Energy absorption in chaotic billiards under rapid peri odic driving\nSpeaker: Wade Hodson (University of Maryland\, Physics)\nTim e: Friday\, September 24\, 2021 - 12:00pm\nLocation: ATL2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn this talk\, I will discus s chaotic billiard systems subject to a rapid periodic driving force\, with driving frequency ω. Classically\, the energy of such systems changes by s mall\, effectively random increments associated with collisions with the bi lliard wall\, leading to a random walk in energy space\, or “energy diffusi on.” I will present a Fokker-Planck description of this process. This model displays several notable features\, including a 1/ω² scaling of the energy absorption rate\, and (in certain special cases) an exact analytical solut ion. I will also present numerical results which corroborate the model. Fin ally\, I will discuss how the energy diffusion framework may be applicable to many-particle interacting systems\, as well as to quantum billiards in t he semiclassical limit.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210916T184344Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Wade Hodson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210614T150000Z DTEND:20210614T160000Z DTSTAMP:20260828T094430Z UID:5q8rg8u1o9j4ttai324idajvao@google.com CREATED:20210526T153547Z DESCRIPTION:QuICS Special Seminar\nTitle: Crystallography of Hyperbolic La ttices\nSpeaker: Igor Boettcher (University of Alberta)\nTime: Monday\, J une 14\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j /97500163110?pwd=eDBYL3VkVzByL2JEOVZvcTA3d2ZhZz09\n\nHyperbolic lattices ar e tessellations of the hyperbolic plane using\, for instance\, heptagons or octagons. They are relevant for quantum error correcting codes and experim ental simulations of curved space quantum physics in circuit quantum electr odynamics. Underneath their perplexing beauty lies a hidden and\, perhaps\, unexpected periodicity that allows us to identify the unit cell and Bravai s lattice for a given hyperbolic lattice. This paves the way for applying p owerful concepts from solid state physics and\, potentially\, finding a gen eralization of Bloch's theorem to hyperbolic lattices. In my talk\, I will explain how to build a hyperbolic crystallography and apply it to physicall y relevant problems.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/9750016311 0?pwd=eDBYL3VkVzByL2JEOVZvcTA3d2ZhZz09\nMeeting ID: 975 0016 3110\nPasscode : 496822\nOne tap mobile\n+13017158592\,\,97500163110# US (Washington DC)\n +13126266799\,\,97500163110# US (Chicago)\nDial by your location\n + 1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n +1 669 900 6833 US (San Jose)\ nMeeting ID: 975 0016 3110\nFind your local number: https://umd.zoom.us/u/a eJBNddWnJ\nJoin by SIP\n97500163110@zoomcrc.com\nJoin by H.323\n162.255.37. 11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.11 4.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244. 140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Austr alia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n69.17 4.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.11 0 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 975 0016 3110\nP asscode: 496822 LAST-MODIFIED:20210601T151749Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211130T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211018T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211115T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20211122T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20211101T160000 EXDATE;TZID=America/New_York:20211108T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20211025T160000 DTSTAMP:20260828T094430Z UID:6bit2fdbcs40kg03b06pfsulvd@google.com CREATED:20210924T114100Z DESCRIPTION:Speaker 1: Jarryd Allyn Horn
    Speaker 2: Zachary Steffen

     
    Advisor:  Benjamin Palmer - Speaker 2

    Title: TBD


    Abstract: TBD

    Note: there wil l NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T114100Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jarryd Allyn Horn/Zachary Steffen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20260828T094430Z UID:3til551u5p312htsfc77sfvk9g@google.com CREATED:20220207T175348Z DESCRIPTION:Speaker: Dr. Esther Braselmann\, Georgetown University

    T itle: TBD


    Abstract: \;http s://chem.umd.edu/events/speaker-esther-braselmann LAST-MODIFIED:20220207T175348Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220317T190000Z DTEND:20220317T200000Z DTSTAMP:20260828T094430Z UID:2igbs5hfjp9jsmumiff98ee58g@google.com CREATED:20220307T150213Z DESCRIPTION:Speaker: Bowen Shen\, UMCP

    Title: Literature Seminar

    Abstract: \;https://chem.umd.edu/events/liter ature-seminar-bowen-shen LAST-MODIFIED:20220307T150213Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210222T110000 DTEND;TZID=America/New_York:20210222T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210222T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: \;Ultra-low switching Energy Mem ories to artificial neurons

    Speaker: \;T. Venky Venkatesan \, \;National University of Singapore

    Abstract : \;Memory devices are responsible for a significant fraction of the energy consumed in electronic systems- typically 25% in a laptop and 50% in a server station. Reducing the energy consumption of memories is an important goal. For the evolving field of artificial intelligence\, the co mpatible devices must simulate a neuron. We are working on three different approaches towards these problems- one involving an organic metal centred a zo complex\, the other involving oxide based ferroelectric tunnel junctions and the last involving real live neuronal circuits. \;


    In th e organic memristors that we have built on oxide surfaces the device perfor mance exceeds the ITRS roadmap specification significantly demonstrating th e viability of this system for practical applications. More than that\, the se organic memories exhibit multiple states arising from interplay of redox states\, counter ion location (studied by in-situ Raman and UV-Vis measure ments) and molecular self-assembly leading to the possibility of neuronal s ystems. These molecular devices are extremely stable and reproducible- a si gnificant departure from conventional organic electronics. \;


    On the oxide- front the significant results are that ferroelectric tunnell ing is seen even in barriers with single and two atomic layers of BaTiO3 or BiFeO3. Oxygen vacancy motion can also play an important role in changing the device characteristics leading to synaptic characteristics. Last but no t the least\, oxide surfaces can be utilized to force neurons to grow at sp ecific places on a surface giving the potential for fabricating live neuron al circuits.




    We are hosting the Spring 2021 JQI Semin ars virtually as Zoom meetings. JQI members and affiliates will receive a Z oom link in an email announcing each seminar. For those without access to Z oom\, we will also be live streaming each seminar on YouTube. Once a semina r starts\, you will find a link to the live stream on our YouTube page at&n bsp\;https://www.youtube.com /user/JQInews. LAST-MODIFIED:20210212T170948Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210225T140000 DTEND;TZID=America/New_York:20210225T153000 DTSTAMP:20260828T094430Z UID:1dsivltk7ered9v2oab7rhsl08@google.com RECURRENCE-ID;TZID=America/New_York:20210218T140000 CREATED:20210125T181305Z DESCRIPTION:Speaker: \;Matthew S. Foster\, \;Rice University

    Title: Electromagnetic Properties of Topological Superconductors
    Abstra ct:

    Bulk topological superconductors (TSCs) are highly sought as pot ential platforms for topological quantum computation. Just as interesting\, the gapless surface Majorana fluid expected to form at the boundary of a b ulk TSC is predicted to exhibit a range of remarkable properties\, such as a precisely quantized longitudinal thermal conductivity. One particularly i nteresting facet of this fluid concerns its response to electromagnetic pro bes. Since energy is the only conserved quantity carried by the Majorana fe rmions\, the surface fluid couples gravitationally (via its energy-momentum tensor) to the electric and in-plane magnetic fields. In this talk\, I wil l discuss electromagnetic probes of TSCs that couple both surface and bulk degrees of freedom. In particular\, we predict novel power-law temperature- dependence of the Meissner effect in fully gapped TSCs\, due to the gapless surface. We also predict a topological anomalous skin effect in Weyl TSCs. This should manifest as an optical absorption peak near 2 \\Delta (twice t he pairing energy) \; due transitions between bulk and chiral surface M ajorana states. The latter may be relevant to the candidate Weyl TSC UTe2. Finally\, if there is time I will discuss a novel quantum-critical "stackin g" phenomenon predicted to occur on the surface of strong TSCs\, due to cha rged impurities (which induce "quenched gravitational disorder" for the sur face Majorana fluid).

    References
    [1] T. C. Wu\, H. Pal\, P. Hosur \, and M. S. Foster\, \;PRL 124\, 067001 (2020)
    [2] T. C. Wu\, H. Pal\, and M. S. Foster\, \;arXiv:2011.08207< /a>

    Host: AnlageLink: \;    https://umd.zoom.us/j/91 251230757?pwd=MkhFREJrUXNTekVZTTRGQ244M1VBZz09< /a>

    Meeting ID: \;912 5123 0757

    Password: \;  \; 558484 LAST-MODIFIED:20210212T160501Z LOCATION: Online via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Matthew S. Foster\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T160000Z DTEND:20220210T170000Z DTSTAMP:20260828T094430Z UID:6458rus2frru8h1i0srf2pu6mo@google.com CREATED:20220207T170515Z DESCRIPTION:Speaker: Dr. Mark Mascal\, UC Davis

    Title: Seeing the Bi g Picture on Global Sustainability: How Organic Chemists Can Lead the Charg e Towards Biorefinery-based Solutions

    Abstract: TBD \;-&n bsp\;    https://chem.umd.edu/events/seeing-big-picture-global-sustainabil ity-how-organic-chemists-can-lead-charge-towards LAST-MODIFIED:20220207T170515Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T173000Z DTEND:20211022T183000Z DTSTAMP:20260828T094430Z UID:5tfg5cgj258pm0s813n2l4oct8@google.com CREATED:20210816T143337Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Gian Giud ice\, CERN \;

    Preceded by zoom lunch at 12:30pm.


    Titl e: Self-Organised Localisation

    Abstract: We describe a new phenomeno n in quantum cosmology: self-organised localisation. When the fundamental p arameters of a theory are functions of a scalar field subject to large fluc tuations during inflation\, quantum phase transitions can act as dynamical attractors. As a result\, the theory parameters are probabilistically local ised around the critical value and the Universe finds itself at the edge of a phase transition. We illustrate how self-organised localisation could ac count for the observed near-criticality of the Higgs self-coupling\, the na turalness of the Higgs mass\, or the smallness of the cosmological constant .
    Seminar will be conducted via zoom\, for zoom link please email mknouse@umd.edu LAST-MODIFIED:20211014T130233Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211109T160000 DTEND;TZID=America/New_York:20211109T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211109T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: Pierre Sikivie\, University of Florida\n\nTitle: Axi on Dark Matter\n\nAbstract:\nThe axion is a hypothetical particle motivated by the Strong CP Problem\nof elementary particle physics and by the dark m atter problem of cosmology.\nCold dark matter axions are naturally produced during the QCD phase\ntransition in the early universe by a process of vac uum realignment.\nThey may be detected on Earth by converting them to photo ns in an\nelectromagnetic cavity permeated by a strong magnetic field. I'l l\ndescribe various axion detection techniques and report on experimental\n efforts under way. Finally we will consider the question whether axionsmay behave differently from other forms of dark matter on astronomical scales. LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210412T153000Z DTEND:20210412T160000Z DTSTAMP:20260828T094430Z UID:7spont3lkml6sat3913tu0kpmd@google.com CREATED:20210311T180532Z DESCRIPTION:

    Title: Dissipative phase transitions and au tonomous error correction

    Speaker: Simon Lieu\, JQI Postdoc


    Abstract: Quantum \;phase transitions a re ubiquitous \;in nature and come in a variety of flavors\, including symmetry-breaking transitions and symmetry-protected topological transition s. While these paradigms are by now well understood for closed systems\, th eir generalization to dissipative open systems remains largely unexplored. In this talk\, I describe recent progress in this direction. This task has& nbsp\;practical \;relevance: A non-trivial phase can be characterized b y an emergent steady state degeneracy in the thermodynamic limit\, which is the key ingredient for "autonomous" error correction. I will describe phot onic \;cat codes in the language of symmetry breaking transitions\, and show that error correcting properties are related to the model's phase dia gram. I will also comment on a theory of symmetry-protected topological tra nsitions in open band insulators.

    We are hosting the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will recei ve a Zoom link in an email announcing each seminar. For those without acces s to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube pag e at \;https://www.youtu be.com/user/JQInews. LAST-MODIFIED:20210323T182333Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T230000Z DTEND:20220223T015000Z DTSTAMP:20260828T094430Z UID:3pbi8r75esi0182ftjl693fl03@google.com CREATED:20220210T145548Z DESCRIPTION:Jordan Goodman presents the film Apollo 13 as part of the Science and Society via Film course. All are welcome. For in formation and the entire semester's schedule\, see the course website: https://www.phy sics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145548Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Apollo 13 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210205T190000Z DTEND:20210205T200000Z DTSTAMP:20260828T094430Z UID:6dhf79vgpbs1m010hlbo8mgj9n@google.com CREATED:20210129T192223Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09< br>
    Speaker: Evan Berkowitz\, UMD

    Title:
    The Semimetal-Mott In sulator Quantum Phase Transition of the Hubbard Model on the Honeycomb Latt ice

    Abstract:
    I describe recent large-scale grand-canonical numer ical studies of the fermionic Hubbard Model\, a model of electrons with nea rest-neighbor hopping and on-site interactions\, formulated on a honeycomb lattice.  \;In particular\, I will focus on the quantum phase transitio n between the gapless semi-metal and gapped Mott-insulating phase\, giving a sytematically controlled first-principles determination of the critical c oupling and associated critical exponents\, after giving an introduction to the Hubbard Model and our first-principles numerical approach. LAST-MODIFIED:20210129T192311Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220829T150000Z DTEND:20220829T160000Z DTSTAMP:20260828T094430Z UID:3omhr9ducoufgiudfn9g11lj33@google.com CREATED:20220804T162256Z DESCRIPTION:Zoom Link: \; \;https://umd.z oom.us/j/91508910194?pwd=RXlQU2YyMUhyUUtGSlI5NnRCbm9xdz09

    Speaker: Alex Ling (National University of Singapore)


    Title: \;Building Quantum Networks from Space: Lessons from SPOOQY-1

    Abstract: The SpooQy-1 project designed \, built and operated a source of polarisation entangled photon-pairs onboa rd a CubeSat for over 600 days. From the lessons learned in the SpooQy-1 mi ssion\, the Singapore-based team is working towards performing entanglement distribution from a small satellite to ground receivers. In this talk\, I will share observations about the performance of the satellite\, the entang led photon source\, and the single photon detectors in orbit. These data ha s been used to validate some very useful models for predicting the effect o f radiation on components. From these first steps\, the Singapore-based tea m is building towards entanglement distribution from a small satellite to g round receivers. I will share these plans\, and suggest possible paths for collaboration. Looking further towards the future\, I will discuss what are some of the challenges my team sees in moving towards the concept of a qua ntum internet that is augmented from space.

    Alex Ling is the head of the Singapore Quantum Engineering program and is a notable technical contr ibutor to quantum optics in space.     LAST-MODIFIED:20220826T182302Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Alex Ling TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210317T150000Z DTEND:20210317T160000Z DTSTAMP:20260828T094430Z UID:1anbchh6sdk98koqvv8u3evjkv@google.com CREATED:20210308T185325Z LAST-MODIFIED:20210308T185425Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR - SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211126T180000Z DTEND:20211126T190000Z DTSTAMP:20260828T094430Z UID:2ubf5b3pqbga3ted3qn9ij1kkn@google.com CREATED:20210914T151329Z LAST-MODIFIED:20210914T151329Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar - NO SEMINAR - HAPPY THANKS GIVING BRESAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211008T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20260828T094430Z UID:4a4f7v7a715rs49hagpiqabcmc@google.com CREATED:20210924T121100Z DESCRIPTION:Title:  Searching for flat bands in kagome lattice metals
     < br>Abstract: 

    The two-dimensionalkagome lattice model—aside from playing a central part in the context ofmagnetic frustration—has long provided a f ruitful theoretical ground for the studyof topological and correlated elect ronic phases\, thanks to its peculiar bandfeatures including Dirac fermions and a dispersionless flat band. In recentyears\, a growing family of trans ition element-based intermetallic compoundstermed “kagome metals” are exper imentally identified to realize these characteristickagome band features. H ere I will introduce our efforts to search for flatbands in the vicinity of the Fermi level in kagome metals based particularly onlate 3d transition e lements (Fe\, Co\, Ni) [1-3]. I will discuss the implicationof these flat b ands on magnetism and highlight the essential role of d-orbitaldegrees of f reedom therein—insights from which we anticipate to be applicableto designi ng flat bands in broader classes of crystalline materials.

    [1]M. Kang \, LY et al.\, Dirac fermions and flat bands in the ideal kagome metalFeSn\ , Nat. Mater. 19\, 163-169 (2019).

    [2]M. Kang et al.\, Topological fl at bands in the frustrated kagome lattice CoSn\,Nat. Commun. 11\, 4004 (202 0).

    [3]LY et al.\, A flat band-induced correlated kagome metal\, arXi v/2106.10824


    Host: Paglione
     
    Note: there will NOT be receptio ns prior to the talk until further notice. LAST-MODIFIED:20210924T121100Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Linda Ye\, Stanford University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210405T110000 DTEND;TZID=America/New_York:20210405T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210405T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: \;Generation of pure qua ntum light in the solid-state

    Speaker: Pasc ale Senellart\, CNRS\, Univ. Paris-Sud\, Université Paris-Saclay

    Abstract: The ability to generate light in pure quantum states is central to the development of quantum-enhanced technologies. Recently\, artificial atoms in the form of semiconductor quantum dots have emerged as an excellent platform for quantum light generation [1]. By placing the qua ntum dot in an optical microcavity\, pure dephasing phenomena are strongly suppressed and single photon wavepackets with very high quantum purity in t he frequency domain are generated [2]. This is obtained at high efficiency\ , which opens new possibilities for optical quantum protocols such as the r esource efficient generation of linear cluster states [3].


    We rec ently revisited the Hong-Ou-Mandel interference of indistinguishable photon s to better understand the effects of imperfect purity [4] and explored new schemes to push further the source efficiency [5]. Interestingly\, this la st study shows that we can turn the emitter imperfections and its coupling the solid-state environment into resources.

     \;Finally\, this hig h-quality artificial atom-photon interface allows us to investigate fundame ntal quantum optics. We recently demonstrated that the coherence imprinted at the atomic level can be transferred to the radiated field through sponta neous emission. We report on  \;the direct generation of light pulses i n a pure quantum superposition of vacuum and one-photon with a full control of their relative populations and phase [6].

     \;

    [1] P Sen ellart\, G Solomon\, A White\, Nature Nanotechnology 12 (11)\, (2017)

    [2] N. Somaschi\, et al. Nature Photonics\, 10\, 340 (2016)

    [3] D. I strati et al. Nature Communications 11\, 5501 (2020)

    [4] H. Ollivier et al.\, Phys. Rev. Lett. 126\, 063602 (2021)

    [5] S. Thomas et al. ar Xiv:2007.04330

    [6] J. C. Loredo\, C. Anton\, et. al\, Nature Photonic s 13\, 803 (2019)




    We are hosting the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receiv e a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each seminar on YouTube. Once a s eminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtub e.com/user/JQInews. LAST-MODIFIED:20210330T234307Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210716T133000Z DTEND:20210716T153000Z DTSTAMP:20260828T094430Z UID:27baa7umhqv2tn7ugcvgdememi@google.com CREATED:20210708T193226Z DESCRIPTION:Title: Design and optimization in near-term quantum computation
    Speaker: Aniruddha Bapat (QuICS)
    Time: Friday\, July 16\, 2021 - 9:3 0am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/9180490339

    Quantum computers have come a long way since conception\, and there is still a long way to go before th e dream of universal\, fault-tolerant computation is realized. In the near term\, quantum computers will occupy a middle ground that is popularly know n as the ``Noisy\, Intermediate-Scale Quantum'' (or NISQ) regime. The NISQ era represents a transition in the nature of quantum devices from experimen tal to computational. There is significant interest in engineering NISQ dev ices and NISQ algorithms in a manner that will guide the development of qua ntum computation in this regime and into the era of fault-tolerant quantum computing.

    In this thesis\, we study two aspects of near-term quantu m computation. The first of these is the design of device architectures\, c overed in Chapters 2\, 3\, and 4. We examine different qubit connectivities on the basis of their graph properties\, and present numerical and analyti cal results on the speed at which large entangled states can be created on nearest-neighbor grids and graphs with modular structure. Next\, we discuss the problem of permuting qubits among the nodes of the connectivity graph using only local operations\, also known as routing. Using a fast quantum p rimitive to reverse the qubits in a chain\, we construct a hybrid\, quantum /classical routing algorithm on the chain. We show via rigorous bounds that this approach is faster than any SWAP-based algorithm for the same problem .

    The second part\, which spans the final three chapters\, discusses variational algorithms\, which are a class of algorithms particularly suit ed to near-term quantum computation. Two prototypical variational algorithm s\, quantum adiabatic optimization (QAO) and quantum approximate optimizati on algorithm (QAOA)\, are studied for the difference in their control strat egies. We show that on certain crafted problem instances\, bang-bang contro l (QAOA) can be as much as exponentially faster than quasistatic control (Q AO). Next\, we demonstrate the performance of variational state preparation on an analog quantum simulator based on trapped ions. We show that using c lassical heuristics that exploit structure in the variational parameter lan dscape\, one can find circuit parameters efficiently in system size as well as circuit depth. In the experiment\, we approximate the ground state of a critical Ising model with long-ranged interactions on up to 40 spins.

    Finally\, we study the performance of Local Tensor\, a classical heuri stic algorithm inspired by QAOA on benchmarking instances of the MaxCut pro blem\, and suggest physically motivated choices for the algorithm hyperpara meters that are found to perform well empirically. We also show that our im plementation of Local Tensor mimics imaginary-time quantum evolution under the problem Hamiltonian. LAST-MODIFIED:20210708T193432Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Aniruddha Bapat TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210930T140000 DTEND;TZID=America/New_York:20210930T153000 DTSTAMP:20260828T094430Z UID:61pomjs6tmmolr68r2ctdphsbl@google.com RECURRENCE-ID;TZID=America/New_York:20210930T140000 CREATED:20210924T120935Z DESCRIPTION:

    David Hsieh

    California Institute of Techn ology

    "Strongly Driven Quantum Materials "

    Driving strongly correlated electron s ystems far from equilibrium can lead to fundamentally new many-body phenome na that are thermally inaccessible. In this talk\, I will describe a series of recent experiments that leverage advanced ultrafast optical spectroscop ic techniques to uncover transient properties of Mott insulators driven by intense electromagnetic fields. By tailoring the characteristics of the ele ctromagnetic field\, I will show how different out-of-equilibrium phenomena can be selectively realized. In particular\, I will highlight the control of magnetic order using resonant driving\, the nonlinear production of elec tron-hole pairs via off-resonant driving\, and coherent “Floquet” engineeri ng of electronic band structures and optical properties via far off-resonan t driving. \;  \;


    Host: PAGLIONE

    This seminar will be broadcast via ZOOM:
    https://umd.zoom.us/s/91301075848 LAST-MODIFIED:20220617T080724Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM (zoom): David Hsieh\, Caltech TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Sep 30_David Hsieh.pdf;FMTTYPE=application/p df:https://drive.google.com/file/d/1dHsv1bJ3HZ7fppzMvgL9nf-2pDlI285G/view?u sp=drive_web END:VEVENT BEGIN:VEVENT DTSTART:20210201T210000Z DTEND:20210201T223000Z DTSTAMP:20260828T094430Z UID:172j7sq3ufr4t5rvh44hkru0ah@google.com CREATED:20210122T183031Z DESCRIPTION:Speaker: \; Hyeok Yoon\, UMD
    Title: \;Low-density Su perconductivity in SrTiO3 \;Probed \;by Planar Tunneling Spectroscopy
    Abstract:
    The dilute oxide semiconductor SrTiO3 \;exhibits \;superconductivity over a wide range of carr ier densities (1017-1021 \;cm-3) \ ;lying outside of the Bardeen-Cooper-Schrieffer (BCS) \;and Migdal-Elia shberg \;regimes for conventional superconductors. Across this range\, the Fermi energy \;traverses a variety of vibrational modes in the syst em and therefore spans \;the \;widest range of adiabatic parameter& nbsp\;of any \;superconductor\, making it an ideal choice to study the physics of dilute \;superconductivity. Recently\, we have developed an& nbsp\;approach using an atomically \;controlled polar oxide as a tunnel barrier to spectroscopically probe \;the electronic structure of SrTiO 3 \;using planar tunneling \;junctions [1\, 2]. \;Wi th this technique\, we examine electron-phonon coupling and superconductivi ty of bulk doped SrTiO3 \;by electron tunneling spectroscopy . We find \;that \;the superconducting state of SrTiO3&n bsp\;surprisingly maintains the thermodynamic \;relationship \;of t he BCS weak-coupling limit \;across the entire superconducting dome\,&n bsp\;despite being in the anti-adiabatic regime. \;We discuss the possi ble role of the soft transverse optical phonon mode for the structure of th is dome.

     \;

     \;[1] T. Yajima \;et al.\, Nano Lett. \;15\, 1622 (2015)

     \;[2] A. G. Swartz\, H. Inoue \;et al.\, Proc. Natl. Acad. Sci. USA \;115\, 1475 (2018) \;

    Advisor: Paglione






    Join Zoo m Meeting
    https://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRCTU5UcHlWTTht cEZSdz09

    Meeting ID: 969 7573 5470
    Passcode: 005596 LAST-MODIFIED:20210201T141911Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Hyeok Yoon\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211206T200000Z DTEND:20211206T213000Z DTSTAMP:20260828T094430Z UID:7353tq3920kfm7m58qclnujll9@google.com CREATED:20210902T171427Z DESCRIPTION:Speaker: Hongwan Liu\, NYU/IAS \n\nTitle: Dark photons and the cosmic radiation background\n\nAbstract: \n\n\n\nThe dark photon is a well- motivated extension of the Standard Model which can mix with the regular ph oton. This mixing is enhanced whenever the dark photon mass matches the pri mordial plasma frequency\, leading to resonant conversions between photons and dark photons. These conversions can produce observable cosmological sig natures\, including distortions to the cosmic radiation background. In this talk\, I will discuss a new analytic formalism for these conversions that can account for the inhomogeneous distribution of matter in our universe\, leading to new and revised limits on the mixing parameter of light dark pho tons derived from the COBE/FIRAS measurement of the cosmic microwave backgr ound spectrum. I will then describe some ongoing work on a dark sector mode l that can explain the longstanding ARCADE radio background excess through resonant conversions of dark photons. LAST-MODIFIED:20211201T211744Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220915T150000Z DTEND:20220915T160000Z DTSTAMP:20260828T094430Z UID:186pmevpgiqq9opkai1siqaa2d@google.com CREATED:20220804T153948Z DESCRIPTION:Speaker: Dr. Justin Kennemur\, Florida State Univers ity

    Title: Making New Materials out of Stubborn Monomers: Approaches to Precise\, sustainable\, Chemically Recyclable\, and Stimuli-Responsive Polymers


    Abstract:  \;A launch-point for potentially transformative materials is the synthetic design of polymer microstructures capable of offering prec ise and unique branch periodicities outside of those provided by traditiona l monomers and methods. The concept of using low ring strain cycloolefin mo nomers\, such as cyclopentenes\, for enthalpy-driven ring-opening metathesi s polymerization (ROMP) is contradictory since the release of ring-strain i s the driving force for success. Our research has leveraged thermodynamic p rinciples to gain near living-like control and high conversion from these s ystems. We have now carried this success forward to instill more precise ar chitectural complexities such as highly isotactic and regioregular systems\ , precision polyelectrolytes\, and bottlebrush polymers with precise five-c arbon branch periodicities. We have carried some of these strategies over t o biomass-based pinene derivates as well. Our findings on the efficacy of t argeted materials and their properties will be discussed. LAST-MODIFIED:20220908T191138Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T140000Z DTEND:20210915T150000Z DTSTAMP:20260828T094430Z UID:0mipf897jrschfi7sgvv7agivq@google.com CREATED:20210909T122828Z DESCRIPTION:Speaker: Literature seminar for Eric Crump (Mullin group)\n\nTi tle: TBD\n\nAbstract: TBD LAST-MODIFIED:20210909T122828Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210308T110000 DTEND;TZID=America/New_York:20210308T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210308T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Thermodynamics of quantum informatio n

    Speaker: Sebastian Deffner\, UMBC

    Ab stract: We are on the verge of a technological revolution. Over th e last couple of years the first computational devices have become commerci ally available that promise to exploit so-called quantum advantage. Even th ough the thermodynamic cost for processing classical information has been k nown since the 1960s\, the thermodynamic description of quantum computers i s still at its infancy. This is due to the fact that many notions of classi cal thermodynamics\, such as work and heat\, do not readily generalize to q uantum systems in the presence of thermal and quantum noise. In this colloq uium\, I will outline a novel conceptual framework of an emerging theory\, Quantum Thermodynamics\, and its application to understanding the propertie s of quantum information.




    We are hosting the Spring 2 021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates wil l receive a Zoom link in an email announcing each seminar. For those withou t access to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouT ube page at \;https://ww w.youtube.com/user/JQInews. LAST-MODIFIED:20210203T190143Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T150000Z DTEND:20210909T163000Z DTSTAMP:20260828T094430Z UID:5ni9am1bjo4qjakhlt4obslo3j@google.com CREATED:20210819T140112Z DESCRIPTION:Seminar will be conducted via zoom: https:// umd.zoom.us/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    S peaker: Uwe-Jens Wiese\, University of Bern

    A 30 min social hour at 11am with the seminar at 11:30am

    Title: A New Concept for the Moment um of a Particle in a Space with Impenetrable Boundaries

    Abstract:In a region of space with impenetrable boundaries\, the standard quantum mechanical momentum operator is not self-adjoint and thus does not describe the physical momentum. A new momentum concept\, that is both physically an d mathematically satisfactory\, leads to a doubling of the Hilbert space. B ased upon the new concept\, the uncertainty relation is generalized to a fi nite volume. Also the Ehrenfest theorem\, which is otherwise not satisfied\ , holds for a particle in a box\, when the new momentum concept is applied. In that case\, bouncing Gaussian wave packets split into two separate pack ets before they merge again later\, and the fractional revival manifests it self in the corresponding momentum space wave functions. The new momentum c oncept is applicable\, for example\, to particles in an optical box trap an d to quantum dots. LAST-MODIFIED:20210819T140112Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210419T110000 DTEND;TZID=America/New_York:20210419T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210419T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Nucleon and nuclear structure from m easurements in muonic and normal atoms

    Speaker: Rand olf Pohl\, Mainz

    Abstract: Laser spectroscopy of sim ple atoms is sensitive to properties of the atomic

    nucleus\, such as its charge and magnetization distribution\, or its
    polarizability. This all ows determining the nuclear parameters from atomic
    spectroscopy\, but al so limits the attainable precision for the determination of
    fundamental constants or the test of QED and the Standard Model.

    In light muonic atoms and ions\, one negative muon replaces all atomic electrons\,
    resu lting in a calculable hydrogen-like system. Due to the muon's large mass
    (200 times the electron mass)\, the muon orbits the nucleus on a 200 times
    smaller Bohr radius\, increasing the sensitivity of muonic atoms to nuc lear
    properties by 200^3 = 10 million.

    This has resulted in a 10f old increase in the precision of the charge radius of
    the proton\, deute ron\, and the stable helium nuclei. The consequences for atomic
    and nucl ear physics\, the determination of fundamental constants\, and the test of< br>QED and the Standard Model are discussed.



    We are hosti ng the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. F or those without access to Zoom\, we will also be live streaming each semin ar on YouTube. Once a seminar starts\, you will find a link to the live str eam on our YouTube page at \;https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210330T234727Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T213000Z DTEND:20211118T223000Z DTSTAMP:20260828T094430Z UID:6i9et5bob8r30jsg4q3083lldi@google.com CREATED:20211011T190300Z DESCRIPTION:Speaker: Guillermo Franco Abellan\, University of Montpellier\n \nTitle: The H0 Olympics: a fair ranking of proposed models\n\n\nAbstract: Despite the remarkable success of the ΛCDM model\, a growing experimental discrepancy (at the level of 4-5σ) has emerged in the determination of the Hubble constant using different probes. While a vast array of ΛCDM extensio ns have been proposed to explain this discrepancy\, understanding the (rela tive) success of these models in resolving the tension has proven difficult -- this is a direct consequence of the fact that each model has been subje cted to differing\, and typically incomplete\, compilations of data. In thi s talk\, I discuss a systematic comparison of sixteen different models whic h have been proposed to resolve the Hubble tension\, and explain how to qua ntify the relative success of each using a series of metrics and a vast arr ay of data combinations. I will finish by describing in more detail one of these proposed models\, a 2-body dark matter decay\, and show how\, despite not resolving the Hubble tension\, it provides a natural explanation for t he milder 2-3σ anomaly in the structure growth parameter (the S8 tension) a nd has also other interesting implications for model-building and the Xenon -1T excess. LAST-MODIFIED:20211118T165154Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211202T190000Z DTEND:20211202T200000Z DTSTAMP:20260828T094430Z UID:2das8cmhl99aaa0q9e51e7jqba@google.com CREATED:20211126T202222Z DESCRIPTION:Title: Divide-and-conquer method for approximating output prob abilities of constant-depth\, geometrically-local quantum circuits\nSpeaker : Nolan Coble (QuICS)\nTime: Thursday\, December 2\, 2021 - 2:00pm\nLocat ion: Virtual Via Zoom: https://umd.zoom.us/j/97341197318\n\nMany schemes f or obtaining a computational advantage with near-term quantum hardware are motivated by mathematical results proving the computational hardness of sam pling from near-term quantum circuits. Near-term quantum circuits are often modeled as geometrically-local\, shallow-depth (GLSD) quantum circuits. Th at is\, circuits consisting of two qubit gates that can act only on neighbo ring qubits\, and that have polylogarithmic depth in the number of qubits. In this talk\, we consider the task of estimating output probabilities of G LSD circuits to inverse polynomial error. In particular\, we will demonstra te how the output state of a GLSD circuit can be approximated via a linear combination of product states\, each of which are produced via new GLSD cir cuits on approximately half the original number of qubits. We will show how this idea can be used to develop a classical divide-and-conquer algorithm for calculating the output probabilities of a 3D geometrically-local circui t. This talk is based on joint work with Matthew Coudron.\n\nReference: N. Coble\, M. Coudron. “Quasi-polynomial time approximation of output probabi lities of geometrically-local\, shallow quantum circuits.” arXiv:2012.0546 0 LAST-MODIFIED:20211126T202222Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/97341197318 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Nolan Coble TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T180000Z DTEND:20220331T193000Z DTSTAMP:20260828T094430Z UID:0v5j54dik2cptcn886i98ocojk@google.com CREATED:20220308T184602Z DESCRIPTION:
    Title: The rich physics of a square lattice: correlations a nd topology in the Eu(Al\,Ga)4 compounds

    Abstract: \;Topological materials have been at the forefront of condensed matter research for more than a decade\, and continue to reveal novel physics. More recently\, corr elated topological materials have added a new level of complexity to our un derstanding of emergent phenomena in quantum materials. Taking a look back of some “old” compounds with the lens of topology is one way of finding suc h new physics. In this talk\, I will revisit the class of Eu-based square l attice compounds Eu(Al\,Ga)4\, where complex magnetic order was first disco vered several years ago. In particular\, the EuAl2Ga2 member of this series shows multiple non-collinear spin texture states below TN. One of these is likely a skyrmion state\, as suggested by neutron diffraction and topologi cal Hall effect measurements. I will discuss the possible relation between the incommensurate charge density wave (CDW) and the non-collinear spin tex tures in the centrosymmetric Eu(Al\,Ga)4 series\, when comparing the EuAl2G a2 properties with those of the end compounds EuGa4 and EuAl4: a CDW is obs erved in EuAl2Ga2\, but not it the EuGa4 analogue\, where the magnetic orde r is just a collinear antiferromagnetic state. Remarkably\, magnetization\, quantum oscillations and ARPES measurements\, together with band structure calculations\, show evidence for topological Weyl nodal lines and a topolo gical phase transition in EuGa4. \;

    Host: Jeffrey Lynn
     \ ;
    Location: Toll Physics Rm 1201
    Time: 2pm - 3:30pm

    Seminar al so on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220308T184706Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Emilia Morosan - Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220607T150000Z DTEND:20220607T160000Z DTSTAMP:20260828T094430Z UID:5es249k9nnig37tnbb1ceu7nce@google.com CREATED:20220530T024125Z DESCRIPTION:Title: Candidate for a self-correcting quantum memory in two d imensions\nSpeaker: Simon Lieu (QuICS)\nTime: Tuesday\, June 7\, 2022 - 1 1:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/28217 42741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nAn interesting problem in the field of quantum error correction involves finding a physical system t hat hosts a "\;self-correcting quantum memory\,"\; defined as an e ncoded qubit coupled to an environment that naturally wants to correct err ors. To date\, a quantum memory stable against finite-temperature effects is only known in four spatial dimensions or higher. Here\, we take a differ ent approach to realize a stable quantum memory by relying on a driven-di ssipative environment. We propose a new model which appears to self-correc t against both bit-flip and phase-flip errors in two dimensions: A square l attice composed of photonic "\;cat qubits"\; coupled via dissipati ve terms which tend to fix errors locally. Inspired by the presence of two distinct Z_2-symmetry-broken phases\, our scheme relies on Ising-like diss ipators to protect against bit flips and on a driven-dissipative photonic e nvironment to protect against phase flips. LAST-MODIFIED:20220530T024125Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special RQS Seminar: Simon Lieu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T150000Z DTEND:20220407T160000Z DTSTAMP:20260828T094430Z UID:4n77mp0j9af706hupv7ucuke8s@google.com CREATED:20220404T152305Z DESCRIPTION:

    Speaker: \;Aavish kar Patel\, UC Berkeley

    Where: ATL4402

    < b>Title: \;Metals with strongly correlated electrons: a tale of int eractions and disorder


    Abstract    : \;In most common meta ls\, the many-body physics of their electrons can be described in terms of additive\, weakly interacting excitations called quasiparticles. However\, several examples of metallic states of matter related to the “high” tempera ture superconductors and other strongly correlated materials exist\, in whi ch strong electron-electron interactions near putative quantum critical poi nts or phases lead to very unconventional physics that cannot be described by quasiparticles\, even as the electron liquid remains compressible. Accur ately taking into account the effects of such interactions has posed a deca des-long challenge for the mathematical methods of quantum many-body physic s\, which have largely relied on the existence of weakly interacting quasip articles. I will describe my recent work that develops a new mathematical f ormalism which can accurately describe the physics of these metals without quasiparticles\, allowing for the controlled computation of a whole host of experimentally measurable static and dynamic quantities\, despite the pres ence of both strong correlations and disorder. This work further leads to t he realization that disorder in the experimental samples may be crucial for describing the essential physics of these strange metals. Time permitting\ , I will also show that the scrambling of quantum information\,as measured by out-of-time-ordered correlators\, in large-N models of quantum critical metals with Fermi surfaces occurs at the maximum possible rate\, and explic itly demonstrate that this phenomenon is tied to the lack of well-defined q uasiparticles in such systems.

    Host: Dr. Jay Sau

    LAST-MODIFIED:20220404T152305Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210414T150000Z DTEND:20210414T160000Z DTSTAMP:20260828T094430Z UID:3g2ltu5e07ug9vkvaa4fnjfupi@google.com CREATED:20210322T144201Z LAST-MODIFIED:20210322T144201Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210923T150000Z DTEND:20210923T163000Z DTSTAMP:20260828T094430Z UID:7n78fh4kjv0tfr3s5g84hg843b@google.com CREATED:20210830T143021Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Huey-Wen Lin\, Mich igan State \;

    Title: Mapping Nucleon Parton Distributions with L attice QCD

    Abstract: The strong force which binds hadrons is describ ed by the theory of quantum chromodynamics (QCD). Determining the character and manifestations of QCD is one of the most important and challenging out standing issues necessary for a comprehensive understanding of the structur e of hadrons. Within the context of the QCD parton picture\, the parton dis tribution functions (PDFs) have been remarkably successful in describing a wide variety of processes. However\, these PDFs have generally been confine d to the description of collinear partons within the hadron. New experiment s and facilities provide the opportunity to additionally explore the three- dimensional structure of hadrons\, which can be described by generalized pa rton
    distributions (GPDs) for example. In recent years\, a breakthrough was made in calculating the Bjorken‐x
    dependence of PDFs in lattice QCD by using large‐momentum effective theory (LaMET) and other similar framewor ks. The breakthrough has led to the emergence and rapid development of dire ct
    calculations of Bjorken-x dependent structure. LAST-MODIFIED:20210920T132604Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220913T160000 DTEND;TZID=America/New_York:20220913T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20220913T160000 CREATED:20210423T130624Z DESCRIPTION:Speaker: Carter Hall\, UMD Physics

    Title: Pr ospecting for dark matter in the Black Hills of Dakota

    Dark matter o utweighs ordinary matter in the cosmos by about a factor of five\, yet its fundamental constituents remain unknown to us. At the Sanford Underground Research Facility in Lead\, South Dakota\, we have recently begun a new sea rch for exotic WIMP particles that might comprise the dark matter. Besides providing an explanation for the large scale structure of the universe\, an observation of WIMPs would open a window on high energy physics beyond the standard model. Our experiment is called LZ (LUX-ZEPLIN)\, and it now join s the Panda-X and XenonNT experiments at the frontier of this field. The ex periment is working well and is expected to explore about one order of magn itude in WIMP scattering cross sections in the next few years. LZ will also have sensitivity to neutrinoless double beta decay\, a process which can r eveal the basic nature of neutrino mass. We will review the status of these new physics searches and discuss what may lie ahead in the next decade. LAST-MODIFIED:20220906T185200Z LOCATION:1410 Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220209T203000Z DTEND:20220209T213000Z DTSTAMP:20260828T094430Z UID:0tt2tb0jchlse2c09s2nhin6lv@google.com CREATED:20220201T162026Z DESCRIPTION:Speaker Name: Dominic Payne\, \;University of New Hampshire

    Title : Dynamics of `Energization Structures' within the Electron D iffusion Region of Magnetic Reconnection

    Abstract : Magnetic reconne ction is a process of rapid magnetic topological change and plasma energiza tion by the reconnecting fields. Reconnection is a ubiquitous process in na tural and laboratory plasmas and is responsible for many of the explosive p henomena observed in the terrestrial magnetosphere and the solar corona. Wh ile it is well-established that reconnection is a plasma energization
    pr ocess\, it is still unclear what mechanisms underlie the energy conversion that takes place in the electron diffusion region (EDR)\, where the magneti c fields completely decouple from the plasma particles and magnetohydrodyna mic (MHD) approximations are invalid. Unique "energization structures" near the EDR have been observed in both Magnetospheric Multiscale (MMS) data an d Particle-in-cell (PIC) simulations of magnetic reconnection\, suggesting complex electron-scale dynamics that influence the efficiency of field-to-p lasma energy conversion and the temporal
    evolution of the EDR and the x- line.

    We begin this seminar with important background on magnetic re connection\, "energization structures" of the diffusion region\, and the MM S mission. Next\, we examine the spatiotemporal evolution of the EDR from a n energy balance perspective by evaluating the terms in
    Poynting's theor em in an MMS encounter with a magnetotail EDR and in a
    PIC simulation. F inally\, we will again use an MMS event and PIC simulations to study the ph ysics of the outer EDR\, with a particular focus on the development and eff ect of localized "generator" regions
    where energized plasma returns some of its energy back to the electromagnetic fields. Our results suggest that the central EDR is characterized by an approximately time-independent bala nce in Poynting's theorem\, whereas near the outer EDR\, there is much more time-dependent energy dissipation as the accelerated electrons begin to re magnetize and mitigate the growth of the reconnection structure.

    Hos t Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20220201T162026Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T220000Z DTEND:20220504T005000Z DTSTAMP:20260828T094430Z UID:3bpb9bir9cvu0gm84j3065felo@google.com CREATED:20220210T150304Z DESCRIPTION:Tom Cohen presents the film Missiles of October as part of the Science and Society via Film course. All are wel come. For information and the entire semester's schedule\, see the course w ebsite: htt ps://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150304Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Missiles of October TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220223T203000Z DTEND:20220223T213000Z DTSTAMP:20260828T094430Z UID:6si66kbtj3qpg8g77ogng4dca9@google.com CREATED:20220211T181231Z DESCRIPTION:Title : Relativistic Magnetic Reconnection in 3D\n\nSpeaker Nam e: Greg Werner\nSpeaker Institution : University of Colorado\n\nAbstract : Magnetic reconnection is a fundamental plasma process that takes place in t hin current sheets and rapidly converts magnetic energy into particle kinet ic energy. It may be the primary mechanism behind spectacular outbursts of radiation in the universe\, from solar flares in our Sun to high energy TeV flares in distant blazars. Magnetic reconnection has been extensively stud ied in 2D\; a particularly important feature of reconnection in 2D is the f ormation of an intricate hierarchy of plasmoids\, which have important cons equences for reconnection dynamics. But how does reconnection proceed in na ture\, in 3D? E.g.\, does a similar plasmoid chain develop? I will discuss the evolution of thin current sheets in relativistic collisionless electron -positron plasma\; although 2D-like reconnection can take place in 3D\, oth er nonlinear instabilities compete with it. In particular\, the relativisti c drift-kink instability can release magnetic energy as fast as reconnectio n can\, and also yields similar nonthermal particle acceleration.\n\nHost N ame: Marc Swisdak\nHost E-Mail: swisdak@Umd.edu LAST-MODIFIED:20220211T181232Z LOCATION:Contact: Marc Swisdak - swisdak@umd.edu for the talk's Zoom addres s SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220221T150000 DTEND;TZID=America/New_York:20220221T163000 DTSTAMP:20260828T094430Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com RECURRENCE-ID;TZID=America/New_York:20220221T150000 CREATED:20220208T193739Z DESCRIPTION:**Seminar will be conducted via zoom**

    Speaker: Selim Hotinli\, JHU

    Title: Fundamental physics from veloci ty reconstruction with the cosmic microwave background and galaxy surveys


    Abstract: Next generation cosmic microwave background (CMB) experiments and galaxy surveys will generate a w ealth of new data with unprecedented precision on small scales. Correlation s between CMB anisotropies and the galaxy density carry valuable cosmologic al information about the largest scales\, creating novel opportunities for inference. It is possible to foresee a cosmological paradigm shift\, in whi ch reconstruction of the gravitational weak-lensing potential\, velocity fi elds and the remote quadropole field will provide the most precise tests of fundamental physics. The use of the second-order effects in the CMB to ext ract this information motivate a strong push towards low noise\, high resol ution frontiers of the upcoming CMB experiments. In this talk I will discus s the prospects to use small-scale kinetic Sunyaev Zel’dovich (kSZ) effect measured by the upcoming CMB experiments\, in cross-correlation with ongoin g galaxy surveys\, to extract cosmological information. I will share the re cent developments on velocity-reconstruction tomography from kSZ and other effects on the CMB.

    For zoom link please email: mknouse@umd.edu     LAST-MODIFIED:20220221T133412Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220128T180000Z DTEND:20220128T184500Z DTSTAMP:20260828T094430Z UID:6fdd1mbl8hqtsoq04mvemton2d@google.com CREATED:20220125T175841Z DESCRIPTION:Title:  Empirical Evaluation of Circuit Approximations o n Noisy Quantum Devices
    Speaker:  Ellis Wilson (NCSU)
    Time:  Friday\, January 28\, 2022 - 1:00pm
    Location:  Virtual Via Zoom: https://umd.zoom.us/j/96160177 762

    Noisy Intermediate-Scale Quantum (NISQ) device s fail to produce outputs with sufficient fidelity for deep circuits with m any gates today. Such devices suffer from read-out\, multi-qubit gate and c ross-talk noise combined with short decoherence times limiting circuit dept h. This work develops a methodology to generate shorter circuits with fewer multi-qubit gates whose unitary transformations approximate the original r eference one. It explores the benefit of such generated approximations unde r NISQ devices. Experimental results with Grover'\;s algorithm\, multipl e-control Toffoli gates\, and the Transverse Field Ising Model show that su ch approximate circuits produce higher fidelity results than longer\, theor etically precise circuits on NISQ devices\, especially when the reference c ircuits have many CNOT gates to begin with. With this ability to fine-tune circuits\, it is demonstrated that quantum computations can be performed fo r more complex problems on today'\;s devices than was feasible before\, sometimes even with a gain in overall precision by up to 60\\%.

    < /u>
    Note: This seminar is part of a collaboration between RQS Ins titutions and will be made available to all RQS members. LAST-MODIFIED:20220125T175841Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Ellis Wilson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210928T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210920T160000 DTSTAMP:20260828T094430Z UID:60e1q9spa22353e2uc553f7lif@google.com CREATED:20210924T113330Z DESCRIPTION:

    This will be a ZOOM class:

    https://umd.zoom.us/s/97540478019 

     

     


    Note: there will NOT be receptions prior to the ta lk until further notice. LAST-MODIFIED:20210924T113330Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C CAREER Seminar (ZOOM): Prof. Weiwei Xie\, Rutgers Universi ty TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211111T190000Z DTEND:20211111T200000Z DTSTAMP:20260828T094430Z UID:4eb90bl3babi61t8s7of9ohmf1@google.com CREATED:20211103T180902Z DESCRIPTION:Title: Noncommutative Nullstellensatz and Perfect Games\nPrima ry tabs\nSpeaker: Adam Bene Watts (University of Waterloo)\nTime: Thursda y\, November 11\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://uwate rloo.zoom.us/j/94137757747?pwd=S3ZvS2s2OFQwUEJwOGY1cVBlMDNOUT09\n\nThe foun dations of classical Algebraic Geometry and Real Algebraic Geometry are the Nullstellensatz and Positivstellensatz. Over the last two decades the bas ic analogous theorems for matrix and operator theory (noncommutative variab les) have emerged. In this talk I'll discuss commuting operator strategies for nonlocal games\, recall NC Nullstellensatz which are helpful\, and the n apply them to a very broad collection of nonlocal games.\nThe main result s of this procedure will be two characterizations\, based on Nullstellensat z\, which apply to games with perfect commuting operator strategies. The fi rst applies to all games and reduces the question of whether or not a game has a perfect commuting operator strategy to a question involving left idea ls and sums of squares. The second characterization is based on a new Nulls tellensatz. It applies to a class of games we call torically determined gam es\, special cases of which are XOR and linear system games. For these game s we show the question of whether or not a game has a perfect commuting ope rator strategy reduces to instances of the subgroup membership problem. Tim e permitting\, I'll also discuss how to recover some standard characterizat ions of perfect commuting operator strategies\, such as the synchronous and linear systems games characterizations\, from the Nullstellensatz formalis m.\n\nThis talk is based on joint work with John William Helton and Igor Kl ep. arXiv link to appear soon. LAST-MODIFIED:20211103T180902Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/94137757747?pwd=S3Zv S2s2OFQwUEJwOGY1cVBlMDNOUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Adam Bene Watts TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210504T160000 DTEND;TZID=America/New_York:20210504T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210518T160000 CREATED:20200116T204737Z DESCRIPTION:RECORDING LINK
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=4b6f1646-608e-41ef-bc2a-ad1e016ec875

    Join Zoom Meeting
    https://umd.zoom.us/j/99484232905?pwd=SjZ1dFRDVG1ObTY2MDE zYjdMY2o1UT09


    Meeting ID: 994 8423 2905
    Passcode: 942935< br>
    Speaker: Sergey Frolov\, University of Pittsburgh

    Title: How do we discover Majorana particles in nanowires?

    Abstract: Majorana p articles are real solutions of the Dirac equation\, representing their own antiparticles. In the condensed matter context\, Majorana refers to electro nic modes in nanostructures described by peculiar ‘pulled-apart’ wavefuncti ons and by hypothesized non-Abelian exchange. This last property makes them interesting for quantum computing. I will present our efforts to generate and verify Majorana modes in semiconductor nanowires coupled to superconduc tors. In particular\, how can we tell Majorana signatures apart from simila r Andreev states that do not have non-Abelian properties? While we may not have a verified Majorana observation now\, I will talk about ways to get th ere: through careful experiments\, improved nanowires and device fabricatio n and with eyes open for alternative explanations.

    Host: Vladimir Ma nucharyan LAST-MODIFIED:20220120T142431Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211018T110000 DTEND;TZID=America/New_York:20211018T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211018T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Sofia Economou\, Virginia Polytechnic and State Univer sity

    Title: \;Generation of photonic graph states from spin-p hoton interfaces
    Abstract: Photonic graph (or cluster) states are of interest for applications in one-way quantum computing and in quantum netw orks. The lack of photon-photon interactions makes the generation of entang led photonic states challenging: it is either based on resource-intensive p robabilistic processes using linear optics\, or it requires nonlinear inter actions through a matter system. Here we will consider the direct generatio n of photonic entangled graph states from controlled quantum emitters. I wi ll discuss the protocols developed in my group for the generation of states for quantum computing and quantum networks\, along with a general procedur e to generate any photonic graph state using minimal resources.

    Host : Alicia Kollar LAST-MODIFIED:20220617T080625Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221117T160000Z DTEND:20221117T170000Z DTSTAMP:20260828T094430Z UID:0erjd7ccrjveohj8dd12c035af@google.com CREATED:20220804T155444Z DESCRIPTION:Literature Seminar\n\nSpeaker: Manny Bazan-Bergamino\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T155444Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210329T200000Z DTEND:20210329T213000Z DTSTAMP:20260828T094430Z UID:1jot3k4hglnj7i64orjnrgbdp9@google.com CREATED:20210120T185016Z DESCRIPTION:Speaker 1: Sungha Baek\, UMD


    Advisor:  \;James Williams

    Title: Magnetotra nsport Characterization of Atomic-scale B-doped δ-layer devices in Si

    Abstract: Atomic precision advanced manufacturing (APAM) processes in sil icon have advanced significantly over the past decade as researchers strive towards the ultimate realization of a single dopant qubit based Kane quant um computer architecture. Here\, we demonstrate the fabrication of atomic-s cale\, B-doped δ-layer devices in Si through area selective deposition of B Cl3 on Si(100) and measure the magnetotransport properties of resulting Hal l bar devices. Magneto and Hall measurements conducted at 3 K revealed a sh eet resistance of 1.9 kΩ without performing incorporation or activation ann eal. Relatively high hole concentrations\, \;1.9 x 1014  \;cm2\, and mobilities\, ∼38 cm2 \;V \;− 1 \;s \;−1\, within a sub-nanometer transport laye r were routinely obtained on multiple samples. We further demonstrate STM-b ased lithography techniques to create B-doped wires and tunnel junctions an d report on their electrical characterization. These findings provide a pat hway towards the realization of atomic-scale acceptor-based devices and the exploration of superconductivity in silicon.



    Join Zoom Meeti ng
    https://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRCTU5UcHlWTThtcEZSdz0 9

    Meeting ID: 969 7573 5470
    Passcode: 005596 LAST-MODIFIED:20210201T142320Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Sungha Baek\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T180000Z DTEND:20211104T190000Z DTSTAMP:20260828T094430Z UID:7f9e4j3icna9sq6chrf44oj688@google.com CREATED:20211013T005418Z DESCRIPTION:Title: Google's quantum experiment: a mathematical perspective \nSpeaker: Gail Letzter (NSA and UMD\, College Park)\nTime: Thursday\, No vember 4\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://umd.zoom.us/ j/93192622019\n\nIn 2019\, Google announced that they had achieved quantum supremacy: they performed a task on their newly constructed quantum device that could not be accomplished using classical computers in a reasonable am ount of time. In this talk\, we present the mathematics and statistics inv olved in the set-up and analysis of the experiment\, sampling from random q uantum circuits. We start with the theory of random matrices and explain h ow to produce a sequence of (pseudo) random unitary matrices using quantum circuits. We then discuss how the Google team compares quantum and classic al approaches using cross entropy and the Porter-Thomas distribution. Alon g the way\, we present other problems with potential quantum advantage and some of the latest results related to noisy near-term quantum computers. LAST-MODIFIED:20211013T005418Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/93192622019 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Gail Letzter TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211011T160000 DTEND;TZID=America/New_York:20211011T173000 DTSTAMP:20260828T094430Z UID:45g0cnu7c2mj3vneum43g4q0m3@google.com RECURRENCE-ID;TZID=America/New_York:20211011T160000 CREATED:20210924T113653Z DESCRIPTION:Speaker : \;Richmond Wang



    Advisor: \;Ichiro Takeuchi

    Title: Perovskit e Rare-Earth Nickelates: Metal-to-Insulator Transition in Samarium Nickelat e Thin Films


    Abstract: \;Perovskite rare-earth nickelates\, RNiO 3 (R = Sm\, La\, Nd…)\, are materials which have been investigated due to t he tunability of their physical properties\, such as electronic and optical properties. One key feature in these materials is a sharp metal-to-insulat or transition (MIT)\, where the material undergoes a phase transition at a certain temperature\, TMIT. This transition temperature varies between each rare-earth element used\, and can be tuned through a variety of methods\, such as inducing strain on the thin films. Samarium nickelate (SNO) is a ra re-earth nickelate which features a TMIT above room temperature for bulk ma terials at approximately 400K. The tuning of this transition temperature al lows this material to become more suitable for applications near room tempe rature. The MIT of the SNO thin films also allows for a property known as z ero-differential thermal emission\, which allows for the tuning of the ther mal emissivity of these thin films at varying temperatures. \;

    N ote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080543Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Richmond Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T160000 DTEND;TZID=America/New_York:20210125T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210513T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210419T160000 EXDATE;TZID=America/New_York:20210426T160000 EXDATE;TZID=America/New_York:20210503T160000 EXDATE;TZID=America/New_York:20210510T160000 EXDATE;TZID=America/New_York:20210322T160000 EXDATE;TZID=America/New_York:20210315T160000 EXDATE;TZID=America/New_York:20210308T160000 EXDATE;TZID=America/New_York:20210301T160000 EXDATE;TZID=America/New_York:20210222T160000 EXDATE;TZID=America/New_York:20210208T160000 EXDATE;TZID=America/New_York:20210201T160000 EXDATE;TZID=America/New_York:20210125T160000 EXDATE;TZID=America/New_York:20210405T160000 DTSTAMP:20260828T094430Z UID:303hccg6b1atvum48cq5pd58hn@google.com CREATED:20210111T154105Z DESCRIPTION:Speaker: Bogdan Dobrescu\, Fermilab\n\nTitle and abstract: tk\n \nFor zoom link please email mknouse@umd.edu LAST-MODIFIED:20210111T154105Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210324T150000Z DTEND:20210324T160000Z DTSTAMP:20260828T094430Z UID:5acv69n6nchlas8itbev63f0hv@google.com CREATED:20210308T194035Z LAST-MODIFIED:20210317T203654Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211026T140000Z DTEND:20211026T153000Z DTSTAMP:20260828T094430Z UID:53hn74qavs6mgkggdtni9m0575@google.com CREATED:20211022T161515Z DESCRIPTION:Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : Natio nal Central University (Taiwan)

    Title : "A Ghost Hunt: Search for Da rk Matter via Ground-based Experiments" \;

    Abstract : I will pre sent two complementary thrusts towards a search for dark matter. I shall st art with a search via the mono-h(bb) channel using the 2016 data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The mono-h(bb) signal is characterized by a Higgs boson\, decaying t o a bottom quark-antiquark pair\, recoiling against large missing transvers e momentum. Novel analysis techniques are exploited and the results are
    interpreted in terms of limits on parameters of various mono-h models. I wi ll then introduce a newly established experiment -- the Taiwan Axion Search Experiment with Haloscope (TASEH)\, aiming to
    look for axions with a ma ss of about 20 μeV\; I will show the current status of TASEH and present it s outlook.

    Host Name: Sally Megonigal
    Host E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211022T161515Z LOCATION:PSC RM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210416T160000Z DTEND:20210416T164500Z DTSTAMP:20260828T094430Z UID:7gq5u4alqkfdv05pcg84ak94h6@google.com CREATED:20210407T134825Z DESCRIPTION:Tit le : Measurement induced phase transition in a solvable all-to-all Brownian circuit modelSpeaker : Subhayan Sahu
          \;

    Time : 12 - 12:45pm\, Friday\, April 16
    Seminar will be held via Zoom: https://umd.zoom.us/j/97099328991 and Meeting ID : 970 9 932 8991

    Abstract: Competition between unitary dynamics that scrambles quantum information non-locally and local measurements that probe and collapse the quantum state can result in a measurement induced en tanglement phase transition. Here we study this phenomenon in an all-to-all Brownian hybrid circuit model of qubits that is analytically tractable. A part of the system is initially entangled with a reference which remains mi xed at low measurement rates but is purified at high measurement rates. Aft er circuit averaging\, purity of the reference can be represented as a path integral coupling four replicas with twisted boundary conditions. Saddle p oint analysis reveals a second-order bulk phase transition corresponding to replica permutation symmetry breaking below a critical measurement rate. T his model also allows us to characterize the transition analytically and de rive a simple mean field type theory for this transition.

         LAST-MODIFIED:20210407T134825Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS-JQI-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211012T173000Z DTEND:20211012T193000Z DTSTAMP:20260828T094430Z UID:30m4peu3r4el6sgo8sbdjtnj3i@google.com CREATED:20210928T160909Z DESCRIPTION:Title: Quantum routing for architecture-respecting circuit tra nsformations\nSpeaker: Eddie Schoute (QuICS)\nTime: Tuesday\, October 12\ , 2021 - 1:30pm\nLocation: ATL 3100A (faculty only) and Virtual via Zoom: https://umd.zoom.us/j/98433503998?pwd=eUQzKy9lS3BtSHJhR0JuLzlPZE0zUT09\n\nT he connectivity between qubits is one of the many design aspects that go in to building a quantum computer. Better connectivity makes it easier to perf orm arbitrary interacting operations in quantum algorithms\, but it may als o come with additional noise and may be costly to manufacture. Therefore\, many proposals for scalable quantum computer architectures sacrifice connec tivity to obtain better modularity and suppress noise. This poses a challen ge to running quantum algorithms because simulating missing connectivity ca n come with significant overhead.\n\nA natural stepping stone is permuting qubits on the architecture\, a task we call quantum routing. We first give a rigorous analysis for the special case of classical routing using SWAP ga tes. Then we present a time-independent Hamiltonian protocol that reverses a chain of qubits asymptotically 3 times faster than classical routing. Usi ng this protocol\, we exhibit the first separation between classical and qu antum routing time. This leads us to lower bound unitary quantum routing to be inversely proportional to the vertex expansion of the architecture grap h in a gate model and inversely proportional to the edge expansion in a Ham iltonian evolution model. We rule out a superpolynomial separation between classical and quantum routing for architectures with poor expansion propert ies such as grid graphs.\n\nWe then show how to use routing to transform qu antum circuits such that their interactions respect the architecture constr aints while attempting to minimize the depth overhead. We benchmark the per formance of our circuit transformations on grid and modular architectures.\ nFinally\, we give a circuit transformation for fault-tolerant quantum comp utation in the surface code. We use a construction for parallel long-range operations in constant logical time that allows us to avoid the need for ro uting altogether. Our benchmarks show improved performance over our previou s circuit transformations using classical routing. LAST-MODIFIED:20211005T155747Z LOCATION:https://umd.zoom.us/j/98433503998?pwd=eUQzKy9lS3BtSHJhR0JuLzlPZE0z UT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Eddie Schoute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220418T203000Z DTEND:20220418T213000Z DTSTAMP:20260828T094430Z UID:7nu7sa05nutuff6n8oa3cphfii@google.com CREATED:20220328T192159Z DESCRIPTION:Title: \;Dark Matter Searches in Space and in High Intensit y Proton Accelerators

    Speaker: Wooyoung Jang\, University of Texas a t Arlington

    Abstract: Dark matter hypothesized in the 1930s is thoug ht to make up a quarter of the mass/energy in the universe. Experiments to elucidate the identity of dark matter have been conducted in various enviro nments from subterranean to outer space. Of these\, I will focus on two rad ically different ways of searching for dark matter. I will begin by discuss ing searches for cosmogenic dark matter in space\, specifically at the Alph a Magnetic Spectrometer (AMS) experiment. I will review the basic physics m otivation of dark matter search in cosmic rays and will discuss how the dar k matter signature in space is studied by measuring electron and positron f lux in the AMS-02 detector. I will then discuss the recent efforts of searc hing for dark matter produced by high-intensity proton beams in future neut rino facilities. I will discuss the overall scenario of data analysis\, lev eraging the strengths of the detector\, simulation\, and analysis technique s used in these studies. I will conclude with dark matter search sensitivit y at the Deep Underground Neutrino Experiment\, the U.S. flagship neutrino experiment.

    Notes: Join the meeting at 4:15 for meet and greet. &nbs p\;Visit http s://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220328T192159Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210928T160000 DTEND;TZID=America/New_York:20210928T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210928T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: S. James Gate s\, Jr.\, Brown University and the University of Maryland
     \;
    Title: Perspective on John S. Toll’s “OmniPolym athism” From An Age Of Skepticism
     \;
    A bstract: I first met John S. Toll during the late nineteen eighties during the time he was leading the University Research Associates (URA) while it s ought to build the Superconducting Super Collider. Had it been built\, the ‘Higgs Boson\,’ an elementary particle\, would have been discovered in the USA\, not at the Large Hadron Colliderin Europe. One night in the physics d epartment\, I saw an elderly gentleman and wondered whether he was lost. Li ttle did I know then\, this man was the creator of the modern University of Maryland. I learned this and many more things later.
      \;
    This talk is a presentation about some of these lessons.
     \;
    Read more about the Toll Lectur e: https://umdphysics.umd.edu/about-us/news/department-news/172 4-lius-toll.html
    LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium: John S. Toll Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T190000Z DTEND:20220303T200000Z DTSTAMP:20260828T094430Z UID:4b543c7j42qslnpaie1ftbg79t@google.com CREATED:20220225T013227Z DESCRIPTION:Title: Random quantum circuits transform loc al noise into global white noise
    Speaker: Alexander Dalzell (Caltech / AWS)
    Time: Thursday\, March 3\, 2022 - 2:00pm
    Location: ATL 3100A an d Virtual Via Zoom:  \;http s://umd.zoom.us/j/95750508288

    We examine the distribution over m easurement outcomes of noisy random quantum circuits in the low-fidelity re gime. We will show that\, for local noise that is sufficiently weak and uni tal\, the output distribution p_noisy of typical circuits can be approximat ed by F*p_ideal + (1−F)*p_unif\, where F is the probability that no local e rrors occur\, p_ideal is the distribution that would arise if there were no errors\, and p_unif is the uniform distribution. In other words\, local er rors are scrambled by the random quantum circuit and contribute only white noise (uniform output). Importantly\, we upper bound the total variation er ror (averaged over random circuit instance) in this approximation and show it grows with the square root of the number of error locations (rather than linearly). The white-noise approximation is useful for salvaging the sign al from a noisy quantum computation\; it was an underlying assumption in co mplexity-theoretic arguments that low-fidelity random quantum circuits cann ot be efficiently sampled classically. Our method is based on a map from se cond-moment quantities in random quantum circuits to expectation values of certain stochastic processes for which we compute upper and lower bounds.


    (In person v iewing at 3100A Atlantic Building)
     LAST-MODIFIED:20220301T191411Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95750508288 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Alexander Dalzell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T150000Z DTEND:20220505T160000Z DTSTAMP:20260828T094430Z UID:7l81bu9e4k6mhqp0nbljn90nil@google.com CREATED:20220207T183138Z DESCRIPTION:Speaker: Dr. Binghe Wang\, Georgia State University< br>
    Title: \;Defying Conventional Wisdom: Developing Carbon Monoxide as a Therapeutic Agent

    Abstract: \;    Nitric oxide\, h ydrogen sulfide and carbon monoxide are all toxic molecules\,
    and yet th ey belong to the gasotransmitter family of signaling molecules with importa nce
    on par with that of neurotransmitters and hormone molecules. Studies have shown that
    these endogenously produced molecules have a wide range of physiologic roles and
    therapeutic potentials. Specific functions of these molecules are of course unique for each
    of them. While the use of NO-producing molecules as therapeutics has long been
    established\, the e xploration of hydrogen sulfide and carbon monoxide as therapeutics is
    st ill at its infancy at best. This presentation will discuss issues related t o developing
    carbon monoxide-based therapeutics as well as CO prodrugs d eveloped in our lab. LAST-MODIFIED:20220425T142314Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220310T160000Z DTEND:20220310T170000Z DTSTAMP:20260828T094430Z UID:6o050ugfa71ab6gr3gadj0726l@google.com CREATED:20220207T174734Z DESCRIPTION:Speaker: Chris Hendon\, University of Oregon

    Title: Defects and Doping in Metal-organic Frameworks

    Abstract: Alth ough generally thought of as highly ordered crystals\, all metal-organic fr ameworks contain defects. Some defects may reveal catalytic active sites or hint at competing material phases\, while others may result in electronic doping. Modern computational approaches are well-suited to studying the eme rgent chemistry of these imperfections\, and can be used to directly inform experiment and characterization of materials with properties that diverge from those gleaned from crystallography. This talk discusses the chemistry afforded by defects in metal-organic frameworks\, with a focus on structura l dynamics and adatoms\, both promoted by Lewis basic sites within the scaf folds. The utility of these defects will be presented from the perspective of heterogeneous catalyst development.
     LAST-MODIFIED:20220303T141907Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T171500Z DTEND:20220329T181500Z DTSTAMP:20260828T094430Z UID:2tmdh5n18fen73t2gn12hme584@google.com CREATED:20220207T154934Z DESCRIPTION:Speaker: Professor Valeria Molinero\, Univers ity of Utah - \;http://molinero .hec.utah.edu/

    Title: Towards the Elucidation of the Mechanisms of Synthesis of Ziolites

    Abstract: \;Zeol ites are porous silicates that constitute the main solid catalysts used by the chemical industry. These structurally complex solids are synthesized fr om aqueous solutions through a multi-stage process that involves multiple p hase transformations mediated by the chemistry of polymerization of silica. Organic cations\, typically tetraalkylammonium ions\, are used to direct t he synthesis towards specific zeolite polymorphs. Nevertheless\, the molecu lar mechanisms by which the cations and silicates form the zeolites are not well understood. This presentation will discuss our current work using mol ecular simulations and nucleation theory to elucidate at which stage zeolit ic order emerges from the synthesis mixture\, the roles of nucleation and g rowth in the selection of zeolite polymorphs\, and what is the smallest siz e of nanozeolite that can be synthesized.


     LAST-MODIFIED:20220317T170228Z LOCATION: https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220214T150000 DTEND;TZID=America/New_York:20220214T163000 DTSTAMP:20260828T094430Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com RECURRENCE-ID;TZID=America/New_York:20220214T150000 CREATED:20220208T193739Z DESCRIPTION:Seminar will be conducted via zoom

    Speaker: \; \;Benjamin Lehmann\, UCSC

    Titl e: Direct detection of dark matter far from the weak scale

    Abstract: The WIMP may not be dead\, but its decline has opened a number of new fron tiers in the search for dark matter. Numerous candidates now line a vast ra nge of scales\, and the weak scale is no longer such a clear guidepost. Thi s is especially problematic for traditional direct detection searches: deca des of development have produced detectors that are extremely sensitive to weak-scale dark matter\, but nearly blind to other important targets. The g rowing scope of our search thus calls for new experimental ideas. I will di scuss a new conceptual framework for the treatment of dark matter--electron interaction rates in condensed matter systems that resolves key theory unc ertainties and opens avenues to probe dark matter at masses several orders of magnitude below existing bounds. In particular\, I will show how the cap abilities of electron-recoil detectors are determined by their dielectric p roperties\, making it possible to easily leverage the complicated many-body physics of detector materials for a new generation of experiments. This no vel formalism is already enabling new approaches to the detection of light dark matter\, and I will share recent results based on the application of t his method to superconducting detectors. These prospects promise to transfo rm direct detection from a surgical instrument at the weak scale to a robus t tool in the search for new physics across the scales.

    For zoom lin k please email mknouse@umd.edu     LAST-MODIFIED:20220209T144016Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220614T140000Z DTEND:20220614T150000Z DTSTAMP:20260828T094430Z UID:2egvach8jmg9todm3948ma4h27@google.com CREATED:20220608T150919Z DESCRIPTION:
    When: 6/14 at 10 am
    Where: Zoom \;https://umd.zoom.us/j/8414181584?pwd=TlMxTkc2eHFjU3E1ck5NS1FsVVh2dz09
    Speaker: Xiao-Gang W en (MIT)
    Title: Classify phases and continues phase transitions f rom categorical symmetry and its condensable algebras
    Abstract: & nbsp\;We study possible phases and possible continuous phase transitions in systems with a given finite symmetry. We use the corresponding categorical symmetry and its condensable algebras to classify the possible gapped phas es and possible gapless critical points\, as well as determine the CFT of t he critical points in 1+1D.
    Host: Yu-An Chen LAST-MODIFIED:20220608T150919Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Zoom Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210217T183000Z DTEND:20210217T193000Z DTSTAMP:20260828T094430Z UID:14jj4a7i37uv8rfb0u3a47e4n4@google.com CREATED:20210114T162602Z DESCRIPTION:Speaker: Kevin Kelly\, Fermilab

    Title: Self-Interacting Neutrinos\, from the Lab to the Cosmos

    Abstract: Partially due to th eir potential for solving the Hubble tension\, self-interacting neutrinos h ave received a great deal of attention over the last several years. Another exciting possibility of these self-interacting neutrino scenarios is that whatever new mediators are involved couple neutrinos to dark matter. In ord er to fully understand and test these different scenarios\, we need to unde rstand their ramifications in all regimes of physics. In this talk\, I will summarize some of the different motivations for self-interacting neutrinos and demonstrate how vastly different probes\, from neutrinoless double-bet a decay searches and production in neutrino facilities\, to observations of Big Bang Nucleosynthesis\, contribute to our understanding. Over the next decade or so\, even more data will be collected that allows us to test thes e ideas more precisely\, hopefully enabling the discovery of this new physi cs.

    For zoom link please email mkno use@umd.edu LAST-MODIFIED:20210203T130233Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint UMD/ JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220317T123000 DTEND;TZID=America/New_York:20220317T140000 DTSTAMP:20260828T094430Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220317T123000 CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducte d via zoom: https://umd.zoom.us /j/94067038750
    For those who would like\, the zoom will be streamed live in PSC 3150

    Speaker: Alessandro Baroni\, LANL

    Title: Qua ntum computing for Nuclear Dynamics

    Abstract: Quantum Computing hold s the promise of enabling calculations of the real-time evolution of quantu m systems\, with a wide range of applications across many areas of current interest such as nuclear and particle physics. In this talk I will discuss the problem of calculating real-time response functions of quantum systems on a Quantum Computer\, focusing on problems originated in Nuclear Physics\ , such as lepton-nucleus scattering. After introducing current quantum algo rithms best suited to perform state preparation and simulation of quantum d ynamics\, I will describe their novel implementations on current gate-based quantum computers for both simple nuclear Hamiltonians and small-scale neu trino-nucleus models.
     LAST-MODIFIED:20220317T140201Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220311T200000Z DTEND:20220311T210000Z DTSTAMP:20260828T094430Z UID:2v3qbafev5303k97ordvjh663o@google.com CREATED:20220307T182922Z DESCRIPTION:
    JSI Online Colloquium: Friday March 11\, 3:00-4:00

    S peaker: Dr. Rostrom Mbarek\, University of Chicago and 2022 Gehrels \;F ellow

    Title: \;Particle Acceleration in Active Galactic Nu clei: From the Large Structures of Jets to the Kinetic Scale of Plasma Turb ulence


    Abstract: \;
    The origin of Ultra-High-Energy Cosmic Rays (UHECRs) and the highest-ener gy astrophysical neutrinos remains as one of the most prominent unresolved questions in astrophysics. We can shed light on such phenomena employing a thorough bottom-up approach to understand the spectra of UHECRs\, neutrinos \, and eventually x/gamma-rays from Active Galactic Nucleus (AGN) jets. In this respect\, I will initially discuss an original theory of particle acce leration in AGN jets\, i.e.\, the espresso mechanism\, that we back by prop agating protons and heavier elements in relativistic 3D MHD simulations of AGN jets accounting \;self-consistently \ ;for i) particle injection\, ii) particle acceleration\, iii) spectra of UHECRs\, iv) effects of losses on UHECRs\, and v) the resul ting neutrino spectral features. Moving from the global scale of jets to th e kinetic scales of the plasma\, I will also present the first steps in und erstanding asymmetric reconnection in the relativistic regime using Particl e-in-Cell (PIC) simulations. Considering the turbulent nature of AGNs\, asy mmetric reconnection can potentially be the main driver of nonthermal lepto n acceleration\, and thus nonthermal radiation\, important to modeling UHEC R losses and neutrino production. I will finally touch upon the interplay o f these two regimes and potential ways of combining them.
    < br>
    Zoom link:
    https://umd.zoom.us/j/9 6995439999?pwd=VHZjaWlQZlFhZnV3ejlWSGtxbHdXdz09
    passcode:& nbsp\; \;692858 LAST-MODIFIED:20220307T182922Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Online Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211109T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20211025T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211101T160000 EXDATE;TZID=America/New_York:20211018T160000 DTSTAMP:20260828T094430Z UID:45gl7f716mpccpshg4k9q8rd8r@google.com CREATED:20210924T113938Z DESCRIPTION:Speaker 1: Yizhou Huang



     
    Advisor: Benjamin Palmer

    Title: TBD


    Abstr act: TBD

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T113938Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Yizhou Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T150000Z DTEND:20211027T161500Z DTSTAMP:20260828T094430Z UID:1qcu8fju3hdvttumit34fvhh9g@google.com CREATED:20211024T011337Z DESCRIPTION:Title: Training Variational Quantum Algorithms Is NP-Hard\nSpe aker: Martin Kliesch (University of Düsseldorf)\nTime: Wednesday\, Octobe r 27\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/9 6652547990\n\nVariational quantum algorithms are proposed to solve relevant computational problems on near term quantum devices. Popular versions are variational quantum eigensolvers and quantum approximate optimization algor ithms that solve ground state problems from quantum chemistry and binary op timization problems\, respectively. They are based on the idea of using a c lassical computer to train a parametrized quantum circuit. We show that the corresponding classical optimization problems are NP-hard. Moreover\, the hardness is robust in the sense that\, for every polynomial time algorithm\ , there are instances for which the relative error resulting from the class ical optimization problem can be arbitrarily large assuming that P≠NP. Even for classically tractable systems composed of only logarithmically many qu bits or free fermions\, we show the optimization to be NP-hard. This elucid ates that the classical optimization is intrinsically hard and does not mer ely inherit the hardness from the ground state problem. Our analysis shows that the training landscape can have many far from optimal persistent local minima. This means that gradient and higher order descent algorithms will generally converge to far from optimal solutions LAST-MODIFIED:20211024T011337Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/96652547990 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Martin Kliesch TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210412T200000Z DTEND:20210412T210000Z DTSTAMP:20260828T094430Z UID:5jkpbunlagglh79n7hhe7p5boa@google.com CREATED:20210111T170749Z DESCRIPTION:

    Title: ER sentinels: insights into receptor oligomeri zation at the core of the unfolded protein response

    Speaker:&n bsp\;Vladislav \;Belyy\, \;University of Californi a\, San Francisco

    Hosted by: \; \;Sergei Sukharev

    < p>Abstract: \;

    The endoplasmic reticulum (ER) membrane-res ident stress sensor IRE1 governs the most evolutionarily conserved branch o f the unfolded protein response. Upon sensing an accumulation of unfolded p roteins in the ER lumen\, IRE1 activates its cytoplasmic kinase and ribonuc lease domains to initiate a potent signaling cascade. IRE1’s activity appea rs to correlate with changes in its oligomeric state\, yet both the degree of oligomerization and its functional significance remain hotly debated. In my postdoctoral work\, I employed several orthogonal experimental approach es ranging from single-particle tracking in live cells to optogenetics in o rder to pinpoint the central role of oligomerization in IRE1’s signaling me chanism. In addition to uncovering exciting aspects of IRE1 biology\, the q uantitative biophysical methods that have been developed in the process wil l be broadly applicable to the study of protein oligomerization as a genera l principle in intracellular signaling.

    Join Zoom Meeting:

    Time: \;April 12\, \;2021 \; @ 4:00PM Eastern Time (US and Canada) \;  \;
    https://u md.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889

    < br>

    LAST-MODIFIED:20210406T161645Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T170000Z DTEND:20211022T180000Z DTSTAMP:20260828T094430Z UID:5cd9g50e9n6cmksapb3thiq9ja@google.com CREATED:20210914T150141Z DESCRIPTION:Speaker: Joseph Heremans\, Professor\, Materials Science &\; Engineering\, Ohio State University

    Title: Thermal and Thermoelectr ic of Topologically Non-Trivial Crystals

    Abstract: \; First\, an overview will be given of the Hereman group activities. They're focused on the fundamental research on thermal transport properties of electrons\, ph onons and magnons\, and on the use of these properties in all-solid-state t hermal energy conversion. Recent focus is on properties that are affected b y topological properties of the Fermi surface in goniopolar materials (Natu re Materials\, \;ht tps://doi.org/10.1038/s41563-019-0309-4) and in Weyl semimetals (Nature Materials\, https://doi.org/10.1038/s41563-021-00983-8). \;

    Second\, a more in-depth view will be given of a new mechanism for heat transport i n Weyl semimetals (WSMs). These are solids with a bulk band structure consi sting of pairs of chirally distinct linear Dirac bands that intersect at th e Weyl points. Thermal transport in WSMs in the extreme quantum limit of ma gnetic fields show the thermal version of the chiral anomaly. This is an ad ditional thermal conductivity that results from the generation of energy by carriers of one chirality and the annihilation of the energy by carriers o f the other. The effect is shown experimentally on single-crystal Bi1- xSbx \;alloys (x=11 and 15 at.%). It dominates the the rmal conductivity at 9 T\, where it increases the electronic thermal conduc tivity by 300%. The thermal chiral anomaly is related to the electrical one \, which is due to the creation and generation of electron numbers\, by the Wiedemann-Franz law with a Lorenz ratio of p2/3 (kB/e)2 \;where p2/3 is now a topological in variant\, unlike in the classical free electron case. This very large effec t extends to over 200 K and could be useful in designing heat switches usef ul\, for example\, in adiabatic demagnetization refrigeration.

    Bio:

    Heremans is an Ohio Eminent Scholar and Professor in the Mechanical an d Aerospace Engineering Department at the Ohio State University\, with appo intments in the Materials Science and Engineering Department and the Depart ment of Physics. He is a member of the National Academy of Engineering\, an d a fellow of AAAS and the American Physical Society. He joined OSU after a 21-year career at the General Motors and later Delphi Research Laboratorie s. \; His research interests focus on experimental measurements of tran sport properties\, energy conservation and recovery. \; In the last dec ade\, he worked on the transport of heat\, charge\, and spin in solids.

    LAST-MODIFIED:20211014T142227Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211105T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211104T140000 DTSTAMP:20260828T094430Z UID:6jukmobun1ouhbd0k23c5kko2j@google.com CREATED:20210924T122035Z DESCRIPTION:NO QMC COLLOQUIUM THIS WEEK LAST-MODIFIED:20210924T122035Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210331T193000Z DTEND:20210331T203000Z DTSTAMP:20260828T094430Z UID:6sjalub9prrvgoa7ccqu6u1sj2@google.com CREATED:20210329T142407Z DESCRIPTION:Title : Overview of Strong Field QED in Laser Plasmas

    Sp eaker Name: Dan Gordon

    Speaker Institution : Naval Research Laborato ry

    Abstract : The world’s highest intensity lasers produce a combina tion of irradiance and electron energy such that quantum electrodynamics (Q ED) effects are important. We give an overview of the theoretical methodolo gy that underlies the QED cross sections used in particle-in-cell (PIC) cod es such as EPOCH and OSIRIS. We highlight generation of copious gamma rays and electron-positron pairs as a compelling physical outcome of the QED las er-plasma interactions\, and show that EPOCH and OSIRIS are in quantitative agreement. We comment on physics that is left out of the standard treatmen t\, and propose a novel cross section that goes beyond the current state of the art.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210329T142407Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20260828T094430Z UID:7dj5je8n8nbesfofmh6ndgvi39@google.com CREATED:20220425T184911Z DESCRIPTION:Speaker: Dr. Chaoxing Liu (Penn State Unive rsity)
    Where: ATL4402
    Title:      Pseudo- Gauge Field in Dirac/Weyl Materials
    Abstract: In solid ma terials\, electrons are usually described by the non-relativistic Schroding er equationsince electron velocity is much slower than the speed of light. However\, the relativisticDirac/Weyl equation can emerge as a low-energy ef fective theory for electrons in certainmaterials. These systems are dubbed “Dirac/Weyl materials” and provide a tunable platformto test quantum relati vistic phenomena in table-top experiments. Owing to the linear-inmomentum f orm\, a variety of physical fields\, e.g. strain and phonons\, can couple t oDirac/Weyl quasi-particles in a similar form as the minimal gauge coupling . These physicalfields thus are dubbed the “pseudo-gauge field”\, which pro vides a useful theoretical conceptto understand or predict a variety of phy sical phenomena beyond the electromagneticresponse in Dirac/Weyl materials. In this talk\, I will focus on the physical phenomena relatedto the pseudo -gauge field created by strain and phonons. I will first discuss the Berryc urvature contribution to the piezo-electric response\, which can be underst ood as the Hallcurrent response driven by strain-induced pseudo-electric fi eld [1]. Our theory predicts ajump of piezo-electric coefficients across a topological phase transition in 2D Diracmaterials. Then I will show that el ectron-phonon interaction in 2D Dirac materials also takesa gauge coupling form\, and consequently\, electron Berry curvature can appear in the effect iveaction of phonon dynamics [2]. This leads to a “helical texture” of phon on angularmomentum in the momentum space\, from which a heat current can dr ive a total phononangular momentum. Finally\, I will show phonons can also induce a gravitational torsion fieldfor the Kramers-Weyl fermions in chiral crystals and discuss the possibility of probing theNieh-Yan anomaly throug h thermal transport measurement [3]. 

    References:[1] Piezoelectr icity and topological quantum phase transitions in two-dimensional spin-orb itcoupled crystals with time-reversal symmetry\, Jiabin Yu\, Chao-Xing Liu\ , NatureCommunications 11\, 2290 (2020).[2] Phonon Helicity Induced by Elec tronic Berry Curvature in Dirac Materials\, Lun-Hui Hu\,Jiabin Yu\, Ion Gar ate\, Chao-Xing Liu\, Phys. Rev. Lett. 127\, 125901\, 2021[3] Probing Nieh- Yan Anomaly through phonon dynamics in the Kramers-Weyl semimetalsof Chiral Crystals\, Chao-Xing Liu\, arXiv:2104.04859\, 2021.  
    Host: Ji abin Yu


    Email emar tin3@umd.edu for questions     LAST-MODIFIED:20220502T184939Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210129T183000Z DTEND:20210129T203000Z DTSTAMP:20260828T094430Z UID:4vqrn62bduh2ttcdrt95hr3r0c@google.com CREATED:20210122T210444Z DESCRIPTION:Speaker Xiangdong Ji\, UMD

    Title: "Questions about the p roton mass"

    Abstract: The proton mass is one of the most fundamental parameters in physics.
    In the chiral limit\, it is entirely generated b y dynamics of massless particles. What
    is the mechanism for generating the mass? How to test it? Is there an experimental
    measurement at the fu ture Electron-Ion Collider which will reveal the underlying physics?
    In this talk\, I will discuss these questions and more.

    Seminar to be conducted via zoom: \;https://umd.zoom.us/j/96371401158?pwd =ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09 LAST-MODIFIED:20210128T131343Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T160000Z DTEND:20220215T170000Z DTSTAMP:20260828T094430Z UID:68cm8jkte12jtkp2euli6rn54n@google.com CREATED:20220207T141538Z DESCRIPTION:Speaker: Dr. Fabien Ferrage\, Ecole Normale Superieure\, Paris< br>
    Title: Dyamics and Interactions in Biomolecules: Insight from NMR by High-resolution Relaxometry

    Abstract: \;https://chem.umd.edu/event s/dynamics-and-interactions-biomolecules-insight-nmr-high-resolution-relaxo metry LAST-MODIFIED:20220207T174018Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210407T200000Z DTEND:20210407T210000Z DTSTAMP:20260828T094430Z UID:0j3bhj4rqvhh3s4aij3uc4n86b@google.com CREATED:20210401T191139Z DESCRIPTION:
    < /table>
    Off the beaten track: displaced vertex se arches at the LHC
     \;
    Speaker: Karri DiPetrillo\, Fermi N ational Accelerator Laboratory (FNAL) \;
    Online Via Zoom: \;&nbs p\;https://umd.zoom.us/j/96004266225 \; \;

    Our best hope for a beyond the Standa rd Model discovery at the LHC requires breaking long-held assumptions about how to look for new physics. In this talk\, I will discuss recent ATLAS an d CMS displaced vertex searches for long-lived particles. \;Common them es for many of these searches are challenges in triggering\, offline recons truction\, and non-standard backgrounds. \;I will compare how ATLAS and CMS address these challenges and how these approaches impact sensitivity t o \;new physics. I will also touch on opportunities to expand our poten tial to look for long-lived particles in the near future. \; LAST-MODIFIED:20210401T191219Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP/Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211101T160000 DTEND;TZID=America/New_York:20211101T173000 DTSTAMP:20260828T094430Z UID:2b9gplqqt322g9adblrqfbj9lb@google.com RECURRENCE-ID;TZID=America/New_York:20211101T160000 CREATED:20210924T113854Z DESCRIPTION:Drew Baden\, former chair of the physics department\, will spea k about his career trajectory and experience in both research and administr ation of a physics department (ours!). He also recently spent time as a pro gram manager with the DOE\, and will offer his insights into the career pat h of a physicist. Please join - in person!

    Location: Toll 1201\, 4pm
    Also on Zoom: \; \; https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080556Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prof. Drew Baden\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220415T190000Z DTEND:20220415T200000Z DTSTAMP:20260828T094430Z UID:3ecmcunndvr6nslhg06ovrma0l@google.com CREATED:20220411T124235Z DESCRIPTION:Two 30 minutes talks.

    Speaker: Dr. Leo Singer (GSFC)

    Title: "Capturing Neutron S tar Mergers from the Ground and Space"

    Neutron star binary mergers a re powerful and distinctive sources of gravitational waves but also leave b ehind broadband electromagnetic radiation in the form of gamma-ray bursts\, afterglows\, and kilonovae. Multimessenger observations of them can be rem arkably illuminating in topics from fundamental physics to cosmology to nuc leosynthesis. To date\, LIGO and Virgo have detected several neutron star m ergers\, one with an exceptionally bright and well-studied electromagnetic counterpart. Electromagnetic follow-up of gravitational-wave sources is hig hly rewarding but also highly challenging because telescopes may have only hours to scan over the LIGO/Virgo/KAGRA localization before the blast redde ns and fades beyond detectability. I will discuss several interconnected to pics related to observing neutron star mergers from the ground and space: g round-based kilonova searches with the Zwicky Transient Facility\, a propos ed NASA mission for rapid ultraviolet observations of mergers\, next-genera tion algorithms and software to optimally coordinate follow-up with network s of telescopes\, and what to expect from the upcoming observing run of LIG O\, Virgo\, and KAGRA.


    Speaker: Dr. Scott Noble (GSFC)
    Title: "Accretion Dynamics of Massive Binary Black Holes"
    Supermassive binary black holes in gaseous environments are key multi-messenger sources for the LISA mission and pulsar timing arrays. Simulating these systems realistica lly is challenging as radiation-coupled magnetohydrodynamics (MHD) must be considered over large dynamic ranges in space and time. We will provide a b rief summary of the progress made in our group to understand these systems theoretically using high-performance simulations of general relativistic MH D and dynamic spacetimes. In order to cover a larger temporal range in one set of simulations\, we constrain our view to the circumbinary disk region and measure how the evolution duration\, accretion disk size\, and mass rat io have on the structure and variability of the accretion flow. We particul arly emphasize how these parameters influence the over-density feature\, or "lump"\, which orbits the binary near the edge of the cavity\, since it is responsible for most of the electromagnetic emission's variability---a key signature of a system being a binary. Extending to smaller length scales\ , we will report on simulations following accretion all the down to the eve nt horizons so that we may begin to investigate how black hole spin affects mini-disk dynamics\, accretion rate\, and jet power. We will conclude by r eporting on our radiative transfer predictions for how black hole spin alte rs the spectral energy distribution of these systems.

    Refreshments and discussion before the talks     LAST-MODIFIED:20220411T124257Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211217T160000Z DTEND:20211217T170000Z DTSTAMP:20260828T094430Z UID:7k82hd3o4lfdksl872b5a96rjj@google.com CREATED:20211130T161100Z DESCRIPTION:Location: ATL4402

    Speaker: Andy Lucas (University of Col orado Boulder)

    Title: Fingerprints of quantum criticality in locally resolved transport

    Abstract: New experimental methods such as nitro gen vacancy center magnetometry allow for the imaging of local transport ph enomena well below the micron length scale. I will describe how these meth ods might be used to experimentally reveal quantum critical dynamics which is invisible in conventional bulk transport measurements. Using a holograp hic system as a toy model\, I will describe what happens as current is push ed through a geometric constriction in both hydrodynamic and quantum critic al transport regimes\, both in charge neutral and non-zero density limits. Remarkably\, our model does seem to quantitatively capture locally imaged transport in charge neutral graphene at high temperatures\, albeit in a la rgely ohmic transport regime with only weak “quantum critical” corrections.

    For any questions email: emartin3 @umd.edu LAST-MODIFIED:20211130T161414Z LOCATION:ATL4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T163000Z DTEND:20220420T173000Z DTSTAMP:20260828T094430Z UID:67cnrn3qlcf5e74u9iltd01n7a@google.com CREATED:20220410T214922Z DESCRIPTION:Title:  Saturation and recurrence of quantum complexity in random quantum circuits
    Speaker:  Michal Oszmaniec (Quantum Informati on Research Group)
    Time:  Wednesday\, April 20\, 2022 - 12:30pm
    Locat ion:  Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4a FdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123

    Quantum complexity is a measure of the minimal number of elementary operations required to approximately prepare a given state or unitary chan nel. Recently this concept has found applications beyond quantum computing- --in the classification of topological phases of matter and in the descript ion of chaotic many-body systems. Furthermore\, within the context of the A dS/CFT correspondence\, it has been postulated that the complexity of a spe cific time-evolved many-body quantum state is sensitive to the long-time pr operties of AdS-black hole interiors. In this context Brown and Susskind co njectured that the complexity of a chaotic quantum system grows linearly in time up to times exponential in the system size\, saturating at a maximal value\, and remaining maximally complex until undergoing recurrences at the doubly-exponential times. In this work we prove the saturation and recurre nce of complexity of quantum states and unitaries in a model of chaotic tim e-evolution based on local random quantum circuits\, in which a local rando m unitary transformation is applied to the system at every time step. Impor tantly\, our findings do not depend on details of the model of random circu its\, such as geometry of interactions between the qubits.  Our results adv ance an understanding of the long-time behaviour of chaotic quantum systems and could shed light on the physics of black hole interiors.  From a techn ical perspective our results are based on establishing new quantitative con nections between the Haar measure and high-degree approximate designs\, as well as the fact that random quantum circuits of sufficiently high depth co nverge to approximate designs.

    The talk is based on joint work with Nicolas Hunter-Jones and Michał Horodecki.  

    (Please note the later start time of 12:30 p.m. for this seminar.)

    (In person viewing at 31 00A Atlantic Building)

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    LAST-MODIFIED:20220410T214922Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3F Cblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Michal Oszmaniec TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210308T213000Z DTEND:20210308T223000Z DTSTAMP:20260828T094430Z UID:29jqq7p3021hpdrvvmdslrtr5q@google.com CREATED:20210223T181015Z DESCRIPTION:Title: Lunar Surface Hydration: a View from Earth

    Speake r: Casey I. Honniball\, NASA Goddard Space Flight Center

    Abstract: H ydration on the lunar surface was first reported in 2009 by three spacecraf t and manifested as a strong absorption at 3 µm. The hydration at 3 µm is p roduced by hydroxyl (OH) attached to metal cations and/or molecular water ( H2O). Measurements of the 3 µm band were revolutionary but the returned spa cecraft data have limitations in wavelength coverage\, spatial resolution\, global coverage\, and lunar time of day. To bridge the gap we use two Eart h based observatories to characterize the true nature of the 3 µm band and to unambiguously detect molecular water. Using the SpeX infrared cross-disp ersed spectrograph at the NASA InfraRed Telescope Facility (IRTF) at Maunak ea Observatory we address diurnal variability of the 3 µm band and with the NASA/DLR Stratospheric Observatory For Infrared Astronomy (SOFIA) we obser ve the Moon at 6 µm where a purely H2O feature is exhibited. \;

    Observations with the IRTF reveal total water (OH + H2O) abundances ranging from 0 to ~500 ppm H2O. From this new data set with improved thermal remov al\, we find diurnal variations of the 3 µm band along with variations with latitude and composition. We observe a decrease in abundance with increasi ng lunar local time\, an asymmetric trend about the equator that favors the South\, and higher abundances in highland regions. Data from SOFIA of the Clavius crater and surrounding region reveal abundances of ~100 to 412 ppm H2O from the 6 µm emission band that we attribute to molecular water on the Moon. All spectra acquired at the Clavius region exhibit a 6 µm emission b and. We are unaware or any other lunar material that may exhibit an isolate d 6 µm band. This is the first direct\, unambiguous detection of H2O on the Moon outside the permanent shadows at the lunar poles.

    Notes: Visit https://bit.ly/2PmJoT6 for access LAST-MODIFIED:20210223T181030Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220418T190000Z DTEND:20220418T203000Z DTSTAMP:20260828T094430Z UID:5jdkuq6dd2sd093i797tfh1b7m@google.com CREATED:20220119T153446Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Prateek Agrawal\, Oxford


    Title: Avoided Deconfinem ent in Randall-Sundrum \;models

    Abstract: Early universe phase t ransitions in RS models are interesting from a theoretical as well as an ob servational viewpoint. They are dual to first-order confinement transitions in large-N gauge theories and are a prime target for stochastic gravitatio nal wave signals. The transition rate to the confined phase is suppressed b y exp(−N^2) and does not complete for parametrically large N\, in significa nt tension with calculability in RS. I will present a mechanism which stabi lizes the IR brane such that the theory avoids \;deconfinement at high temperature and stays in the confined phase at all times after inflation an d reheating. \; Early universe phenomena such as WIMP freeze-out\, axio n abundance\, baryogenesis and gravitational wave signatures are qualitativ ely modified.
    For zoom link please email mknouse@umd.edu     LAST-MODIFIED:20220415T173027Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20260828T094430Z UID:28qlas691abi971fdkaref9goh@google.com CREATED:20220401T135435Z DESCRIPTION:New frontiers in quantum simulation and co mputation with neutral atom arrays

    Giulia Semeghini\, Harvard Un iversity


    Learning how to create\, study\, and manipula te highly entangled states of matter is key to understanding exotic phenome na in condensed matter and high energy physics\, as well as to the developm ent of useful quantum computers. In this talk\, I will discuss recent exper iments where we demonstrated the realization of a quantum spin liquid phase using Rydberg atoms on frustrated lattices and a \;new \;architect ure based on the coherent transport of entangled atoms through a 2D array. Combining these results with novel technical tools on atom array platforms could open a broad range of possibilities for the exploration of entangled matter\, with powerful applications in quantum simulation and information.< u>     LAST-MODIFIED:20220401T135519Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210204T140000 DTEND;TZID=America/New_York:20210204T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201130T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:7k842che3i7p9nbqm163c6memm@google.com CREATED:20210124T203341Z DESCRIPTION:Speaker: You Zhou\, UMD

    Title: Wigner crystals in ato mically thin heterostructures

    Abstract:
    A Wigner crystal is o ne of the earliest predicted collective electronic states and exhibits intr iguing quantum and classical phase transitions. However\, realizing quantum  Wigner crystals requires placing semiconductors in a strong magneti c field\, limiting the detailed interrogation of these correlated states an d their phase transitions. In this talk\, I will present a new platform to realize Wigner crystals without a magnetic field\, based on atomical ly thin heterostructures made of transition metal dichalcogenides. In parti cular\, we create semiconducting MoSe2 bilayers separated by a t hin insulating layer and electrically control the individual layer’s carrie r density. We observe optical signatures of a series of bilayer Wigner crys tals formed at symmetric (1:1) and asymmetric (4:1 and 7:1) electron doping of the two MoSe2 layers. These bilayer Wigner crystals\, created from the commensurate stacking of triangular electron lattices\, a re remarkably stable and allow us to probe both their quantum and classical melting transitions. These results open up new avenues for creating and st udying exotic many-body quantum phases in 2D systems.


    Host: Pagl ione
    For the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210124T203341Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: You Zhou\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210326T200000Z DTEND:20210326T210000Z DTSTAMP:20260828T094430Z UID:4m2e2gbcvmh2ohtqu7996vcfpa@google.com CREATED:20210319T113313Z DESCRIPTION:

    Title: \; Quantized quantum transport in interacting sys tems

    Speaker: \; \;Martin Fraas (University of California\, Davi s)


    Location: \; \;Virtual Via Zoom: https://umd.zoo m.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09


    Abstr act: \; \;
    For non-interacting fermions at zero temperature\, it is well established that charge transport is quantized whenever the chemic al potential lies in a gap of the single-body Hamiltonian. Proving the same result with interactions was an open problem for nearly 30 years until it was solved a few years ago by Hastings and Michalakis. The solution uses n ew tools originally developed in the context of the classification of exoti c phases of matter\, and was used before in the proof of the many-dimension al Lieb-Schultz-Mattis theorem. I will explain these developments and show a theorem that unifies most of the known results on the subject. The same m ethod applies also to FQHE and proves the existence of anyonic excitations in systems with fractional Hall conductance. The talk is based on a joint w ork with Alex Bols\, Sven Bachmann and Wojciech De Roeck.

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    LAST-MODIFIED:20210321T115012Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210622T190000Z DTEND:20210622T210000Z DTSTAMP:20260828T094430Z UID:4n972diuan0jiid77ja61a4ooa@google.com CREATED:20210610T122157Z DESCRIPTION:Title: Analog quantum simulation and quantum many-body dynamic s in atomic\, molecular and optical systems\nSpeaker: Fangli Liu (QuICS)\nT ime: Tuesday\, June 22\, 2021 - 3:00pm\nLocation: Virtual Via Zoom: https:/ /umd.zoom.us/j/98584157912?pwd=NTRYV0ZTcVVuT0k5a29yemNYL0VCdz09\n\nIn recen t decades\, the rapid development of quantum technologies has led to a new era of programmable platforms\, enabling the realizations of quantum simula tion and quantum computation. This dissertation is motivated by recent expe rimental progress on controlling individual quantum degrees of freedom in s ystems such as trapped ions and Rydberg atom arrays. By tailoring the inte ractions in these quantum systems\, we study analog quantum simulations of various physical phenomena\, including non-equilibrium quantum dynamics and nontrivial topological physics. In the first part of the dissertation\, w e study slow quantum many-body dynamics in trapped-ion systems and Rydberg atom arrays. We first show that either the long-range interactions or an ad ditional symmetry-breaking field can give rise to a confining potential. Su ch a potential can couple domain wall quasiparticles into mesonic or baryon ic bound states. These confined quasiparticles strongly suppress the quant um information dynamics and lead to slow thermalization. In the limit of s trict domain-wall confinement\, the full Hilbert space is fragmented into e xponentially many disconnected subspaces. Further\, we demonstrate that the rmalization can be halted by quantum engineering a uniformly increasing fie ld in the trapped-ion quantum simulator. The second part of the dissertati on focuses on topologically relevant phenomena in quantum simulators. We fi rst study the effect of experimentally relevant disorder in 2D Rydberg atom arrays. We find that there are three distinct localization regimes due to the presence of nontrivial topological bands. We further study the non-equi librium dynamics of Abelian anyons in a one-dimensional system. We show tha t the interplay of anyonic statistics and interactions can give rise to spa tially asymmetric quantum dynamics. Finally\, we use Nielsen's geometric ap proach to quantify the circuit complexity in topological models. We find th at circuit complexity of ground states and circuit complexity of non-equili brium steady states both exhibit nonanalytical behavior at topological tran sition points. LAST-MODIFIED:20210610T122258Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense - Fangli Liu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210720T150000Z DTEND:20210720T160000Z DTSTAMP:20260828T094430Z UID:77bmpb6uod69oeqppm7d51562n@google.com CREATED:20210701T141147Z DESCRIPTION:Speaker: \;Yi-Hsien Du \;(University of C hicago)
    Title: \;Volume-preserving diffeomorphism as higher-r ank gauge symmetry
    Abstract: \;Higher-rank gauge theories hav e been drawing attention in condensed matter physics in recent years. The p hysical motivation of such theories is thought to be associated with a new class of topological matter so-called "fractons\," quasiparticles with rest ricted mobility. We demonstrate a nonlinear version of the higher rank gaug e symmetry in 2+1D and 3+1D with volume-preserving diffeomorphism as the sy mmetry group. We show that various condensed matter systems\, including fra ctional quantum Hall effect and ferromagnetism\, possess this symmetry\, wh ich exhibits fractonic behavior of the excitations in these systems.

    Host TBA


    Email rcawthor@umd.edu for Zoom detai ls LAST-MODIFIED:20210701T141147Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220912T190000Z DTEND:20220912T203000Z DTSTAMP:20260828T094430Z UID:23cc6aub186bi3jqnctecv1i8c@google.com CREATED:20220719T134601Z DESCRIPTION:Speaker: Amalia Madden\, Perimeter Institute

    Title: The Piezoaxionic Effect

    Abstract: Axion dark matter (DM ) constitutes an oscillating background that violates parity and time-rever sal symmetries. Inside piezoelectric crystals\, where parity is broken spon taneously\, this axion background can result in a mechanical stress. We cal l this new phenomenon "the piezoaxionic effect". When the frequency of axio n DM matches the natural frequency of a bulk acoustic normal mode of the pi ezoelectric crystal\, the piezoaxionic effect is resonantly enhanced and ca n be read out electrically via the piezoelectric effect. We also point out another\, subdominant phenomenon present in all dielectrics\, namely the "e lectroaxionic effect". An axion background can produce an electric displace ment field in a crystal which in turn will give rise to a voltage across th e crystal. Near-future experimental setups that probe these two effects are applicable for axion masses between 10^−11eV and 10^−7eV\, a challenging r ange for most other detection concepts.     LAST-MODIFIED:20220902T204108Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220315T220000Z DTEND:20220316T005000Z DTSTAMP:20260828T094430Z UID:4ble4fu6acgu9u3nlp7l2tcmqa@google.com CREATED:20220210T144107Z DESCRIPTION:Jeff Starr presents the film Zero Days < /i>as part of the Science and Society via Film course. All are welcome. For information and the entire semester's schedule\, see the course website: https://www. physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145300Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Zero Days TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220926T150000Z DTEND:20220926T160000Z DTSTAMP:20260828T094430Z UID:7g3dhoecobs9s6hiqhinjjk586@google.com CREATED:20220818T204802Z DESCRIPTION:Speaker: Avik Dutt\, UMD Mechanical Engineering and IPST


    Title: \; Harnessing synthetic dimensions for topological photonics

    The dimensionality of a physical system strongly influences its classical a nd quantum behavior\, be it for Ising phase transitions\, or the recurrence properties of random walks\, or for Anderson localization. Specifically fo r topological phenomena\, richer topological and emergent phases can be exp ected in higher dimensions. However\, experimentally realizing such high-di mensional systems is challenging in real space because it requires complica ted spatial structures. I will describe our approach of using internal degr ees of freedom of photons such as frequency\, temporal modes or spin\, to r eplace real-spatial dimensions. This approach\, which is often termed synth etic dimensions (inspired by pioneering work in cold atoms)\, allows us to experimentally demonstrate analog simulation of many condensed matter pheno mena (e.g. the quantum Hall effect\, spin-momentum locking\, spin-orbit cou pling) in a single\, periodically modulated resonator through time-resolved band-structure spectroscopy [1]. This elucidates how higher-dimensional ph ysics can be implemented in simpler\, experimentally feasible lower-dimensi onal structures by coupling these internal degrees of freedom. Examples of the flexible tunability of synthetic-space photonic circuits to realize rep rogrammable unitary transformations for photons [2] that are useful for qua ntum computing and ML will also be provided. The talk will conclude with pr ospects for studying new phases of light and matter such as non-Hermitian t opological phases [3]\, and provide an outlook for interfacing quantum opti cs with synthetic-space photonics for future quantum technologies.

    [1] Dutt\, Lin\, Yuan\, Minkov\, Xiao\, Fan\, Science 367\, 59 (2020).

    [2] Buddhiraju\, Dutt\, Minkov\, Williamson\, F an\, Nature Comm. 12\, 2401 (2021).

    [3] Wang*\, Dutt*\, Yang\, Wojcik\, Vučković\, Fan\, Science 371\, 1240 (2021)\; Wang\, Dutt\, Wojcik\, Fan\, Nature 598\, 59 (2021).

     LAST-MODIFIED:20220823T173751Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Avik Dutt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T220000Z DTEND:20220511T005000Z DTSTAMP:20260828T094430Z UID:4ddt8pr3kdoipps1dlinetsk0a@google.com CREATED:20220210T150401Z DESCRIPTION:Jim Gates presents the film The Day the E arth Stood Stillas part of the Science and Society via Film course. All are welcome. For information and the entire semester's schedule\, see the course website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150401Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: The Day the Earth Stood Still TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T163000Z DTEND:20220414T173000Z DTSTAMP:20260828T094430Z UID:2mu12tuh6oud7ht1kntrhlpqck@google.com CREATED:20220413T133928Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.us/j/94067 038750

    Speaker: \;Christian Drischler\, MSU/FRIB

    Title : Nuclear matter from chiral effective field theory with quantified uncerta inties

    Abstract: Recent advances in neutron star observations have the potential to provide novel insights into strongly interacting matt er at high densities. On the other hand\, chiral effective theory has devel oped into a powerful framework for studying nuclear matter properties up to intermediate densities with theoretical uncertainties quantified. In this talk\, I will discuss some of the recent developments in microscopic nuclea r matter calculations with chiral two- and three-nucleon interactions and B ayesian uncertainty quantification. Constraints on the nuclear symmetry ene rgy and its density dependence will be discussed in detail. I will also dem onstrate how effective field theory enables statistically meaningful compar isons among competing nuclear theory predictions\, and experimental and obs ervational constraints on the equation of state in the era of multimessenge r astronomy.

     LAST-MODIFIED:20220413T133928Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210208T110000 DTEND;TZID=America/New_York:20210208T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210511T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210215T110000 EXDATE;TZID=America/New_York:20210315T110000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com CREATED:20210114T020453Z DESCRIPTION:

    Title: TBA

    Speaker: TBA

    Abstract: TBA



    We are hosting t he Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and aff iliates will receive a Zoom link in an email announcing each seminar. For t hose without access to Zoom\, we will also be live streaming each seminar o n YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210128T015605Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210407T150000Z DTEND:20210407T160000Z DTSTAMP:20260828T094430Z UID:1ffkem8solldci2vba2d9taaia@google.com CREATED:20210322T143812Z LAST-MODIFIED:20210322T143812Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210325T140000 DTEND;TZID=America/New_York:20210325T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201207T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:0f9896cjsevjarfbt037tra83r@google.com CREATED:20210125T162425Z DESCRIPTION:Speaker: David Broun\, Simon Fraser University\n\n\nTitle: TBA\ nAbstract:\n\n\nHost: Anlage\nFor the zoom link please email Kristin Stenso n at QMC@umd.edu LAST-MODIFIED:20210125T162425Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: David Broun\, Simon Fraser University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210305T180000Z DTEND:20210305T190000Z DTSTAMP:20260828T094430Z UID:1q3nqafpndf14qn1lj22vmt1nm@google.com CREATED:20210202T135732Z DESCRIPTION:Speaker: Allison Beese\, \;MSE/ME Associate Professo r\, Pennsylvania State University

    Title: \;Additively Manufactur ed Metals: Microstructures and Mechanical Behavior \;

    A bstract: The unique thermal histories (i.e.\, rapid solidification followed by repeated thermal cycles with the addition of layers) seen in additive m anufacturing (AM) of metal alloys results in microstructures that may conta in phases\, grain morphologies\, or internal pores different from those see n in their conventionally processed counterparts. These microstructures dic tate the resulting mechanical properties of the alloys\; thus\, to enable t he adoption of AM for structural applications\, an understanding of the lin ks between microstructure and deformation and/or fracture is required in or der to safely and reliably design against failure. In this talk\, I will pr esent our work on experimentally and computationally investigating the impa ct of these unique microstructures on the deformation and failure behavior of additively manufactured alloys. I will discuss our efforts in measuring and modeling the multiaxial plasticity and fracture of these materials. Add itionally\, I will describe our work on designing\, fabricating\, and chara cterizing functionally graded materials in which the chemistry is intention ally changed as a function of position to impart disparate properties as a function of position within a 3D component.

    via Zoom
    Sherri Tatum
    statum1 2@umd.edu
    https://mse.u md.edu/seminar-series LAST-MODIFIED:20210224T193039Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T140000Z DTEND:20220407T150000Z DTSTAMP:20260828T094430Z UID:5np2k718crga47t3fbpc8fii5j@google.com CREATED:20220405T174702Z DESCRIPTION:Title: Tuning arrays with rays: Physics-informed tuning of qua ntum dot charge states\nSpeaker: Justyna Zwolak (NIST)\nTime: Thursday\, April 7\, 2022 - 10:00am\nLocation: ATL 3100A and Virtual Via Zoom: https:// umd.zoom.us/j/98334495382?pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09 Meeting ID: 983 3449 5382 Passcode: 606007\n\nCurrent semiconductor-based quantum c omputing approaches rely upon achieving control of nanocircuits at the sing le-electron level and using them as quantum bits (qubits). Establishing a s table configuration of spins in quantum dot (QD) devices is accomplished by a combination of electrostatic confinement\, bandgap engineering\, and dyn amical control via nearby electrical gates. However\, with an increasing nu mber of QD qubits\, the relevant parameter space grows exponentially\, maki ng heuristic control unfeasible. In semiconductor quantum computing\, devic es now have tens of individual electrostatic and dynamical gate voltages th at must be carefully set to isolate the system to the single-electron regim e and to realize good qubit performance. Large-scale quantum processors hin ge on fully autonomous tuning processes that can be parallelized for practi cal applications.\n\nOver the past decade\, there has been a number of adva nces aimed at automation of the various aspect of tuning QD devices\, from testing device functionality and bootstrapping to setting the device topolo gy to charge tuning. While the initial attempts relied on the appealingly i ntuitive and relatively easy to implement conventional algorithms involving a combination of techniques from regression analysis\, pattern matching\, and quantum control theory\, more recently researchers began to take advant age of the tools provided by the field of artificial intelligence. I will d iscuss how our recently proposed ray-based classification framework (RBC) c an be combined with an “action-based” algorithm to tune a bootstrapped QD d evice into a specific few-electron charge configuration\, paving a path tow ards fully automated QD quits initialization.\n\nJoin Zoom Meeting\nhttps://u md.zoom.us/j/98334495382?pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09\n\nMeetin g ID: 983 3449 5382\nPasscode: 606007\nOne tap mobile\n+13017158592\,\,9833 4495382#\,\,\,\,*606007# US (Washington DC)\n+13126266799\,\,98334495382#\, \,\,\,*606007# US (Chicago)\n\nDial by your location\n +1 301 715 85 92 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\nMeeting ID: 983 3449 5382\nPasscode: 606007\nFind your local number: https://umd.zoom.us/u/afsRRoM50\n\nJoin by SIP\n98334495382@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.1 14.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (A msterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\ n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada To ronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n14 9.137.24.110 (Japan Osaka)\nMeeting ID: 983 3449 5382\nPasscode: 606007 LAST-MODIFIED:20220405T174702Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/98334495382? pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09 Meeting ID: 983 3449 5382 Passcode: 60 6007 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Justyna Zwolak TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211028T140000 DTEND;TZID=America/New_York:20211028T153000 DTSTAMP:20260828T094430Z UID:0v6nmv83sdjqu7f84eiegc9pai@google.com RECURRENCE-ID;TZID=America/New_York:20211028T140000 CREATED:20210924T121945Z DESCRIPTION:Title: \; \;Discrete quantum geometry and topology i n solid-state materials

    Abstract: \;The topological classifi cation of continuous manifolds in real space and reciprocal space has been extensively discussed for solid-state materials. This has led to the discov eries of many intriguing materials hosting non-trivial topological orders s uch as helical domains\, magnetic skyrmions\, Chern insulators\, Z2 insulat ors and Weyl semimetals. However\, the discrete topology and geometry in th ese scenarios have attracted much less attention. Here I will introduce our efforts in practicing the discrete geometry and topology in solid-state ph ysics\, which not only refreshes our conventional understandings\, but also resolves many difficulties encountered by their continuous counterparts. I n particular I will discuss (i) the topological transition of spin textures defined on a discrete lattice [1]\, and (ii) a new perspective to understa nd the intrinsic spin-Hall effect as a property of the discrete quantum man ifold of the Fermi surface [2].

     \;[1] \;Gen Yin\, Yufan Li\, Lin gyao Kong\, Roger K. Lake\, C. L. Chien\, and Jiadong Zang \;Phys. Rev. B \;93\, 174403

    [2] Jie-Xiang Yu\, Jiadong Zang\, Roger K Lake\, Yi Zhang\, and Gen Yin\, arXiv:2106.09073




    Host: Takeuchi


    Location: Rm 1201\, Toll Physics Bldg
    This seminar will also be broadcast via ZOOM: \;http s://umd.zoom.us/j/91301075848 \;

    Note: there will NOT be rec eptions prior to the talk until further notice. LAST-MODIFIED:20220617T080632Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Gen Yin\, Georgetown University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 28_Gen Yin.pdf;FMTTYPE=application/pdf:h ttps://drive.google.com/file/d/197U09QjlKCWSe0M1nygPo7WvVbVb6CAv/view?usp=d rive_web END:VEVENT BEGIN:VEVENT DTSTART:20211011T190000Z DTEND:20211011T203000Z DTSTAMP:20260828T094430Z UID:1gavfnrmb1o0jj1s3ltpm2oujf@google.com CREATED:20210809T204616Z DESCRIPTION:Speaker: Pouya Asadi\, MIT\n\nTitle: Darkness Beyond Unitarity\ n\nAbstract: There has been substantial effort on searching for thermal Dar k Matter (DM) in the conventional mass window of GeV to tens of TeV without any positive results. This null result has motivated efforts to develop ne w dynamics in the dark sector that allow us go beyond the usual thermal DM mass window. In this talk\, I introduce two such simple mechanisms. First I will point out a potentially dramatic effect on the DM abundance in a clas s of confining dark sectors during its deconfinement phase transition. I wi ll then switch to an even simpler setup where entropy dump into SM (from de cay of another thermal relic) can open up a substantial parameter space for DM mass. I will discuss the viable mass range for DM in each setup and how it is affected by details of dark sector dynamics. I will also discuss way s we can probe such setups in future. LAST-MODIFIED:20211007T175114Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211209T140000 DTEND;TZID=America/New_York:20211209T153000 DTSTAMP:20260828T094430Z UID:7r5kf6la3hq1lh7ri1rv4paqij@google.com RECURRENCE-ID;TZID=America/New_York:20211209T140000 CREATED:20210924T122743Z DESCRIPTION:Title: Strongly correlated Weyl semimetal in Kondo lattice syst em

    Abstract: Band structure topology and strong electronic correlati ons are essential components for a plethora of emergent phenomena in novel quantum materials\, although their intersection has not been extensively st udied. Kondo systems provide a promising platform to investigate strongly c orrelated topological phases. Following the recent theoretical prediction t hat Kondo hybridization incorporated with crystalline symmetry could lead t o topological gapless states\, we investigated two Kondo lattice systems\, one with inversion symmetry broking\, one with nonsymmorphic crystal symmet ry. In both cases\, we observed anomalous Hall effect originating from nont rivial Berry curvature associated with Weyl nodes in the vicinity of Fermi level.


    Host: Butch
     \;
    Location: Toll Physics Rm 1201< br>
    Seminar also on Zoom
    Meeting LAST-MODIFIED:20220617T080737Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Sheng Ran\, Washington U-St. Louis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220308T181500Z DTEND:20220308T191500Z DTSTAMP:20260828T094430Z UID:6ac5qntpheke6har9ds3mnka5b@google.com CREATED:20220207T160511Z DESCRIPTION:Speaker: Dr. Peter Battaglia\, DeepMind
    Title: Physical Inductive Biases for Learned Simulation and Scientific Di scovery


    Abstract: \;This talk will explore both how o ur knowledge of physics can improve our machine learning approaches\, and h ow our machine learning tools can be used to improve our knowledge of physi cs. I'll describe work my collaborators and I have done using particle- and mesh-based approaches for learning simulation\, how we leverage inductive biases about ODEs\, Hamiltonian and Lagrangian mechanics in learned simulat ors\, and how we can use neural networks with symbolic regression to discov er physical governing equations from simulated and real data.


     LAST-MODIFIED:20220303T140244Z LOCATION:https://go.umd.ed/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210408T190000Z DTEND:20210408T200000Z DTSTAMP:20260828T094430Z UID:68lu0u3sarsnt6vrdccnuju3i8@google.com CREATED:20210326T154256Z DESCRIPTION:Speaker: \nJin-Peng Liu (QuICS)\nTime: \nThursday\, April 8\, 2 021 - 3:00pm\nLocation: \nVirtual Via Zoom: https://umd.zoom.us/j/910279955 97?pwd=MDNPQWNRZVdGSTlFQUdyUStlTE80QT09\nDifferential equations are ubiquit ous throughout mathematics\, natural and social science\, and engineering. There has been extensive previous work on efficient quantum algorithms for linear differential equations. However\, analogous progress for nonlinear d ifferential equations has been severely limited due to the linearity of qua ntum mechanics. We give the first quantum algorithm for dissipative nonline ar differential equations that is efficient provided the dissipation is suf ficiently strong relative to the nonlinearity and the inhomogeneity. We als o establish a lower bound showing that differential equations with sufficie ntly weak dissipation have worst-case complexity exponential in time\, givi ng an almost tight classification of the quantum complexity of simulating n onlinear dynamics. Finally\, we discuss potential applications of this appr oach to problems arising in biology as well as in fluid and plasma dynamics .\nArXiv link: https://arxiv.org/abs/2011.03185\nTopic: IQC-QuICS Math and Computer Science Seminar\nTime: Apr 8\, 2021 03:00 PM Eastern Time (US and Canada)\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/91027995597?pwd=MDNPQWNRZ VdGSTlFQUdyUStlTE80QT09\nMeeting ID: 910 2799 5597\nPasscode: 360060\nOne t ap mobile\n+13017158592\,\,91027995597# US (Washington DC)\n+19294362866\,\ ,91027995597# US (New York)\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New York)\n +1 312 626 6799 US (Chicago)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n +1 669 900 6833 US (San Jose)\nMeeting ID: 9 10 2799 5597\nFind your local number: https://umd.zoom.us/u/admT3X8vUS\nJoi n by SIP\n91027995597@zoomcrc.com\nJoin by H.323\n162.255.37.11 (US West)\n 162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 (Germa ny)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melbourne )\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n69.174.57.160 (Cana da Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo )\n149.137.24.110 (Japan Osaka)\nMeeting ID: 910 2799 5597\nPasscode: 36006 0 LAST-MODIFIED:20210326T154256Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210126T160000 DTEND;TZID=America/New_York:20210126T170000 RRULE:FREQ=WEEKLY;UNTIL=20220201T045959Z;BYDAY=TU EXDATE;TZID=America/New_York:20210126T160000 EXDATE;TZID=America/New_York:20210209T160000 EXDATE;TZID=America/New_York:20210216T160000 EXDATE;TZID=America/New_York:20210302T160000 EXDATE;TZID=America/New_York:20210316T160000 EXDATE;TZID=America/New_York:20210511T160000 EXDATE;TZID=America/New_York:20210525T160000 EXDATE;TZID=America/New_York:20210601T160000 EXDATE;TZID=America/New_York:20210608T160000 EXDATE;TZID=America/New_York:20210615T160000 EXDATE;TZID=America/New_York:20210622T160000 EXDATE;TZID=America/New_York:20210629T160000 EXDATE;TZID=America/New_York:20210706T160000 EXDATE;TZID=America/New_York:20210713T160000 EXDATE;TZID=America/New_York:20210720T160000 EXDATE;TZID=America/New_York:20210727T160000 EXDATE;TZID=America/New_York:20210803T160000 EXDATE;TZID=America/New_York:20210810T160000 EXDATE;TZID=America/New_York:20210817T160000 EXDATE;TZID=America/New_York:20210824T160000 EXDATE;TZID=America/New_York:20210831T160000 EXDATE;TZID=America/New_York:20211130T160000 EXDATE;TZID=America/New_York:20211214T160000 EXDATE;TZID=America/New_York:20211221T160000 EXDATE;TZID=America/New_York:20211228T160000 EXDATE;TZID=America/New_York:20220104T160000 EXDATE;TZID=America/New_York:20220111T160000 EXDATE;TZID=America/New_York:20220118T160000 EXDATE;TZID=America/New_York:20220125T160000 EXDATE;TZID=America/New_York:20210504T160000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211021T150000Z DTEND:20211021T163000Z DTSTAMP:20260828T094430Z UID:7i1sfjf117oip91adrli4sakq3@google.com CREATED:20210831T190001Z DESCRIPTION:Seminar will be conducted via zoom:     https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Richard Furnstahl\, Ohio State


    Title: “Short-range-correlation physics in atomic nu clei”
     \;
    Abstract:
    Short-range correlations (SR Cs) in atomic nuclei are usually identified as components of the nuclear wa ve function with momenta well above the Fermi momentum. There has long been an apparent need for SRCs to account for measured cross sections\, but the situation has been murky until recent knock-out experiments succeeded in c leanly isolating this physics. An SRC phenomenology has been developed that accounts for the observations\, but it seems to be at odds with successful descriptions of nuclear structure\, such as the shell model. The applicati on of the renormalization group (RG) can make sense of this conflict. RG me thods are used to analyze critical phenomena in condensed matter and evolve the strong coupling and parton distributions in high-energy quantum chromo dynamics. Applied to nuclei\, the RG shows how SRC physics is manifested di fferently at varying resolution scales. I will illustrate how the RG can br idge low- and high-resolution treatments of the same experiment\, enabling simpler calculations and shedding light on the implications of SRC physics and on long-standing discrepancies between theory and experiment. \; LAST-MODIFIED:20211013T203826Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210608T200000Z DTEND:20210608T210000Z DTSTAMP:20260828T094430Z UID:6t9tu7hm8npqbt21mjmjr6059n@google.com CREATED:20210603T160442Z DESCRIPTION:Title: Fault-tolerant error correction using flags and error w eight parities
    Speaker: Theerapat Tansuwannont (University of Waterloo)< br>Time: Tuesday\, June 8\, 2021 - 4:00pm
    Location: Virtual Via Zoom: https://zoom.us/j/95104727535?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz09
    < br>Fault-tolerant error correction (FTEC)\, a procedure which suppresses er ror propagation in a quantum circuit\, is one of the most important compone nts for building large-scale quantum computers. One major technique often u sed in recent works is the flag technique\, which uses a few ancillas to de tect faults that can lead to errors of high weight and is applicable to var ious fault-tolerant schemes. In this talk\, I will further improve the flag technique by introducing the use of error weight parities in error correct ion. The new technique is based on the fact that for some families of codes \, errors of different weights are logically equivalent if they correspond to the same syndrome and the same error weight parity\, and need not be dis tinguished from one another. I will also give a brief summary of my works o n FTEC protocols for several families of codes\, including cyclic CSS codes \, concatenated Steane code\, and capped color codes\, which requires only a few ancillas.

    Join Zoom Meeting
    https://zoom.us/j/95104727535 ?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz09
    Meeting ID: 951 0472 7535
    P asscode: mJ8fVht

    This talk is part of the \;IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210603T160537Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210916T193000Z DTEND:20210916T203000Z DTSTAMP:20260828T094430Z UID:267dv9o5q8emttosn3us002qmv@google.com CREATED:20210716T190107Z DESCRIPTION:Zoom: https://umd.z oom.us/j/92659169552

    Title: Climate Change and Extreme Summer W eather Events

    Abstract: In addition to well-established direct physi cal linkages between a warming planet and extreme summer weather events suc h as floods\, droughts\, heat waves and wildfires are more tenuous but pote ntially profound linkages tied to altered characteristics of the Northern H emisphere jet stream and associated wave disturbances. Some of the most sig nificant extreme summer weather events in recent years have been associated with high-amplitude quasi-stationary Rossby waves with zonal wavenumbers 6 -8 tied to the phenomenon of Quasi-Resonant Amplification (QRA). Current st ate-of-the-art (CMIP5) climate models are unable to adequately resolve this mechanism owing to substantial errors in the models in the curvature of th e zonal velocity field which is a key quantity controlling the associated w ave disturbances. A reliable fingerprint for the occurrence of QRA can\, ho wever\, be defined in terms of the zonally-averaged surface temperature fie ld. Examining climate observations and historical (CMIP5) climate model sim ulations\, we have demonstrated consistent evidence for an increasing trend in QRA events over the past half century tied to anthropogenic warming. Ex amining CMIP5 model projections we find that QRA-related extreme weather ev ents are likely to increase by ~50% this century under business-as-usual ca rbon emissions\, but there is considerable variation among climate models\, and a reduction in mid-latitude aerosol loading could actually lead to Arc tic de-amplification this century\, ameliorating potential further increase s in persistent extreme weather events. Given the uncertainties\, substanti al further increases in these events cannot however be ruled out.

    Bi o: Dr. Michael E. Mann is Distinguished Professor of Atmospheric Science at Penn State\, with joint appointments in the Department of Geosciences and the Earth and Environmental Systems Institute (EESI). He is also director o f the Penn State Earth System Science Center (ESSC). Dr. Mann was a Lead Au thor on the Observed Climate Variability and Change chapter of the Intergov ernmental Panel on Climate Change (IPCC) Third Scientific Assessment Report in 2001 and was organizing committee chair for the National Academy of Sci ences Frontiers of Science in 2003. He has received a number of honors and awards including NOAA's outstanding publication award in 2002 and selection by Scientific American as one of the fifty leading visionaries in science and technology in 2002. He contributed\, with other IPCC authors\, to the a ward of the 2007 Nobel Peace Prize. Dr. Mann is author of more than 200 pee r-reviewed and edited publications\, numerous op-eds and commentaries\, and five books.

    https://en.wikipedia.org/wiki/Michael_E._Mann

    A popular article in Scientific American about jet streams\, March 2019
    https://www.scientificamerican.com/article/drough ts-and-floods-may-level-off-until-2050-but-then-watch-out/

    Talk details: https://aosc.umd.edu/events/aosc-seminar-dr-michael-mann-9162021< /a> LAST-MODIFIED:20210908T220223Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Michael Mann/Joint talk with AOSC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210301T210000Z DTEND:20210301T220000Z DTSTAMP:20260828T094430Z UID:35ucooreuj4hoj9evp6o1uv7rb@google.com CREATED:20210111T133949Z DESCRIPTION:Speaker: Daniel Harlow\, MIT

    Title: Simple Holographic M odels of Black Hole Evaporation

    Abstract: Recent work has shown that the quantum extremal surface formula is able to reproduce a unitary Page c urve for some evaporating black holes\, as well as other related phenomena.  \; One puzzling aspect of these calculations however is that their bul k side relies on Hawking's picture of black hole evaporation\, in which the radiation is mixed! \; Why should a calculation which assumes the radi ation is mixed lead to a Page curve where it is pure? In this talk\, after reviewing these calculations I will present two simplified holographic mode ls which illustrate this tension and show how it can be resolved. \; Ba sed on work with Chris Akers and Netta Engelhardt.
    For zoom link please email:     mknouse@umd.edu LAST-MODIFIED:20210225T154759Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210409T150000Z DTEND:20210409T160000Z DTSTAMP:20260828T094430Z UID:77qr8r3e1kagu83u563omt8914@google.com CREATED:20210330T132049Z DESCRIPTION:Thesis Defense: \; The membership problem for constant-size d quantum correlations is undecidable
    Speaker: \; \;Hong Hao Fu (QuICS)
    Time: \; \;Friday\, April 9\, 2021 - 11:00am
    Location : \; \;Virtual Via Zoom: https://umd.zoom.us/j/7856728753?pwd= QThZcW14MnZxYWJNV1hnWDF3RXczdz09
    One of the most fundamental and cou nterintuitive features of quantum mechanics is entanglement\, which is cent ral to many demonstrations of the quantum advantage. Studying quantum corre lations generated by local measurements on an entangled physical system is one of the direct ways to gain insights into entanglement. The focus of thi s dissertation is to get better understanding of the hardness of determinin g if a given correlation is quantum\, which is also known \; \;as t he membership problem of quantum correlations.

    Previous work has sho wn that the general membership problem is computationally undecidable. Wher e does the hardness come from? Is it just because the size of a quantum cor relation (i.e.\, the number of real values in the description of the correl ation) can be arbitrarily large? We would like to understand the role playe d by the varying sizes of correlations in the hardness of the membership pr oblem.

    It has been shown that certain quantum correlations require t he measured quantum system to be maximally entangled with a certain dimensi on. This is a unique phenomenon of quantum correlations and it is known as self-testing. The first step towards answering the hardness of the membersh ip problem of quantum correlations is to get deeper understandings about se lf-testing\, and more specifically\, about the size of a correlation that c an self-test a maximally entangled state of arbitrarily large dimension. If correlations of a fixed size can self-test entangled states of unbounded d imension\, this phenomenon is a strong evidence suggesting that deciding me mbership of fixed-sized correlations can be very hard.

    We first show that there exists an infinite subset of the set of all the prime numbers s uch that\, for each prime p in this set\, a maximally entangled state of lo cal dimension (p-1) can be self-tested by a correlation of a fixed size. Si nce this set is infinite\, this result implies that constant-sized correlat ions are sufficient to self-test maximally entangled states of unbounded di mension.

    Building on the self-testing result\, we show that the vary ing sizes of correlations are not the only root of the hardness. Specifical ly\, we show that the membership problem of fixed finite-sized correlations is still computationally undecidable when the fixed size is sufficiently l arge. That is\, the hardness of the membership problem of quantum correlati ons is independent of the varying sizes of correlations. In fact\, the hard ness arises from the fact that the structure of some set of correlations of a particular size is so complicated that no finite description of this set can allow a Turing machine to decide if a correlation is quantum or not. LAST-MODIFIED:20210331T152108Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS - Dissertation Defense - Hong Hao Fu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210323T160000 DTEND;TZID=America/New_York:20210323T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210323T160000 CREATED:20200116T204737Z DESCRIPTION:

    Meeting Recording Link: https://umd.hosted.panopto.co m/Panopto/Pages/Viewer.aspx?id=f6e2e112-f3d5-4359-8be3-acf40164a61a

    J oin Zoom Meeting

    https://umd.zoom.us/j/92360965134?pwd=WjI3 ZDhCTlRFQTZ4TTFXTFBGMVhQQT09

    Meeting ID: 923 6096 5134

    Passcode: 89593

    Gianpaolo Carosi

    Lawrence Livermore Nationa l Laboratory


    Title: \;“Tuning into the Dark Matter Axi on” \; \; \; \;

    Abstract: \; The nature of dark matter is one of the deepest mysteries in physics and co smology. A preponderance of indirect evidence points to it being compose of new particles beyond the standard model. The Axion\, which arises as a byp roduct of explaining why the neutron doesn’t have a measurable dipole momen t\, is one very well-motivated candidate. The Axion Dark Matter Experiment (ADMX) is the DOE High Energy Physics flagship search for axions in the US and is based  \;at the University of Washington in Seattle. ADMX uses a large microwave cavity immersed in a strong static magnetic field to reson antly convert dark matter axions to detectable photons. Recently ADMX has c ompleted its first set of data runs with unprecedented sensitivity in the c lassical QCD-axion mass range of several µeV and is continuing to take data in a previously unexplored region of parameter space. In this talk I will describe the history of axion dark matter searches\, describe the recent AD MX results and near term search prospects and give a survey of the R&\;D efforts currently underway to explore the entire axion dark matter mass wi ndow.

     \;Hosted by Anson Hook

    LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211025T160000 DTEND;TZID=America/New_York:20211025T173000 DTSTAMP:20260828T094430Z UID:1n38i0k8ncufh23gk9pqo6153u@google.com RECURRENCE-ID;TZID=America/New_York:20211025T160000 CREATED:20210924T113813Z DESCRIPTION:Speaker: \; Julia Catherine Sell \;
    Advisor: \; Mohammad Hafezi

    Title: \;Magneto-Optical Measurements of Charged a nd Neutral Excited-States in Monolayer WSe2

    Abstract: Monolayer semi conductor transition metal dichalcogenides (TMDs) have attracted significan t attention in the last decade due to their unique optical properties. Simi lar to graphene\, but with a threelayer (staggered) honeycomb lattice\, TMD s host direct-gap transitions at their ±K valleys that exhibit circular-dic hroism due to their finite Berry curvature. The reduced dimensionality of m aterials in this system\, coupled with techniques like hexagonal boron nitr ide (hBN) encapsulation\, lead to enhanced Coulomb interaction and extremel y tightly bound excitons EB ≈300-500meV. This results in a semiconductor pl atform where many quasiparticle states\, including multi-particle states li ke trions\, biexcitons (both neutral and charged)\, and most recently excit on-polarons can all coexist with distinct energetic signatures. The extreme ly tight binding also allows observation of excited versions of these parti cles\, as part of the Rydberg series in TMDs. Because of the large number o f quasiparticle species that can be observed simultaneously\, the magnetic field dependence of these states has become an important tool in understand ing and reliably identifying each species. However\, over time there have b een a significant number of reports in the literature that observe magnetic behavior that diverges from the single-particle model. These reports have led to an emerging many-body interpretation that can reconcile the broad ra nge of results. In our work\, we aim to further contribute to the understan ding of this interaction in an excited regime. Using photoluminescence exci tation (PLE)\, we confirm the existence of a charged Rydberg state in WSe2. Further\, we study the response of this state with magnetic field for the first time. These measurements shine light on the nature of excited states and show that many-body interaction observed in the ground state remains a valid interpretation in the excited regime as well.

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080609Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Julia Sell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210330T171500Z DTEND:20210330T181500Z DTSTAMP:20260828T094430Z UID:0njvc8itk5qdraueepf42hmumj@google.com CREATED:20210202T180214Z DESCRIPTION:Speaker: Dr. Jeffrey Epstein\, QuICS

    Title: \;Odd T ransport in Active Systems

    Abstract: Active matter is a class of sys tems in which energy is dissipated at the level of individual particles\, o ften through nonconservative driving forces. Such systems represent a depar ture from equilibrium along a distinct avenue from that studied within the framework of linear irreversible thermodynamics\, where systems are driven at their boundaries. I will discuss two interesting transport coefficients that may appear in two-dimensional active matter systems\, the odd viscosit y and odd diffusivity\, both of which involve fluxes perpendicular to the g radients that drive them. In particular\, I will argue that previous justif ications for the connection of the odd viscosity to time-reversal symmetry breaking are ill-founded\, and provide a modified argument based on the der ivation of Green-Kubo relations. I will show numerical results that suggest that Onsager's regression hypothesis\, used to derive the viscosity Green- Kubo relations\, is valid about (at least some) nonequilibrium steady state s.

    Where: \;https://go.umd.edu/statphys_spring2021 LAST-MODIFIED:20210324T195852Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210413T160000 DTEND;TZID=America/New_York:20210413T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210413T160000 CREATED:20200116T204737Z DESCRIPTION:Join Zoom Meeting
    https://umd.zoom.us/j/94377670746?pw d=RlViaDUxc01aNTFqREFLQjlzditUQT09

    Meeting ID: 943 7767 0746
    Passcode: 786118

    Speaker: Mimi Hiebert\, UMD

    Title: The Urani um Club: Tracking Down Lost Radioactive Relics from World War II
    Abstrac t: \;
    At the end of World War II\, a top secret scientific intellige nce mission\, code named Alsos\, was commissioned with the goal of assessin g the state of the German nuclear program. \; What they found when they arrived in the small town of Haigerloch in Germany’s Black Forest\, was a deep pit in the floor of an old monastery wine cellar and 664\, five centim eter cubes of uranium buried in a nearby field. \; These were the remai ns of Werner Heisenberg’s final\, failed attempt at building a functioning nuclear reactor.

    To the Alsos Mission members\, the con formation found at Haigerloch\, that the German program had failed at comin g anywhere close to creating a sustained nuclear reaction\, much less an at omic bomb\, was surprising. \; Germany was not only the birthplace of a tomic physics\, but the German program had also held a nearly two year head start over the Manhattan Project. \; Miscalculations\, infighting betw een the scientists and mismanagement from the Nazi government\, all combine d to ensure the failure of Germany’s nuclear ambitions. The contrasts that can be drawn between the German nuclear program and the Manhattan Project p rovide lessons in both science and scientific management.

    The majority of the uranium cubes found at Haigerloch have largely been lost to history. \; One\, however\, made its way to the collection of D r. Tim Koeth\, sparking a years-long research project seeking to investigat e how many cubes still remain\, where they are now\, and what stories they might reveal along the way.


    Host: Tim Koeth LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T110000 DTEND;TZID=America/New_York:20210913T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210913T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Sebastian Will\, Columbia University\n\nTitle: Creatin g Ultracold Dipolar NaCs Molecules\nAbstract: Ultracold dipolar molecules c ombine features of ultracold atoms and trapped ions. They promise new resea rch avenues in quantum simulation\, quantum computing\, and quantum chemist ry. But creating and taming ultracold systems of dipolar molecules is not a routine task. For example\, Bose-Einstein condensates of dipolar molecules have not been created\, yet.\n\nIn this talk\, I will discuss the creation of dipolar NaCs molecules in their absolute ground state. NaCs molecules h ave a large dipole moment of 4.6 Debye\, which will lead to strong long-ran ge dipole-dipole interactions. Over the past year\, we have created overlap ping Bose-Einstein condensates of Na and Cs [1]\, located Feshbach resonanc es of the quantum gas mixture\, and created near-degenerate gases of NaCs F eshbach molecules. Most recently\, we have made significant progress toward s NaCs molecules in their absolute ground state. With this system\, we plan to explore new quantum phases\, such as dipolar crystals and Mott insulato rs with fractional filling. Finally\, I will give a brief overview of a new effort that we recently started. Using programmable arrays of Sr atoms\, w e are working towards demonstrating collective effects\, such as subradianc e\, which may help enhancing coherence in many-body quantum systems in a fu ndamental way.\n\n[1] “Overlapping Bose-Einstein Condensates of Na and Cs”\ , C. Warner et al.\, arXiv:2106.01334 (2021)\n\nHost: Charles Clark LAST-MODIFIED:20220617T080549Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220829T180000Z DTEND:20220829T190000Z DTSTAMP:20260828T094430Z UID:3daaivagv6nob2olirbsc8h1bp@google.com CREATED:20220824T165932Z DESCRIPTION:Title: Everything You Always Wanted to Know A bout Papers (The Human Side of Physics)

    Speaker: Alessandro S. Villa r\, \;Associate Editor\, \;Physical Review Letters

    Abstract: Physics is a human activity. Doing hard science involves not only having i deas and taking data\, but also convincing your peers by communicating your results in a clear fashion. In this talk\, I will offer a bit of the edito rial perspective from PRL on how scientific knowledge is established in pap ers. Our main topic will be the way papers are conceived\, treated by edito rs\, assessed by peers\, and finally published.     LAST-MODIFIED:20220824T170126Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Alessandro S. Villar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210305T190000Z DTEND:20210305T203000Z DTSTAMP:20260828T094430Z UID:51mh5psr6mcok2qr3plnud0p7m@google.com CREATED:20210125T152430Z DESCRIPTION:Seminar will be conducted via zoom: \; \;https:// umd.zoom.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT0 9

    Speaker: Peter Petrezcky\, Brookhaven National Lab

    Titl e: Pion structure from lattice QCD

    Abstract:
    I will discuss latti ce calculations of the pion valence parton distribution function (PDF) in t he framework of large momentum effective theory (LaMET). The calculations a re performed at two small lattice spacings a=0.04fm and a=0.06fm and the va lence pion mass of 300 MeV. In addition to the pion PDF I also present resu lts on the PDF of the first radial excitation of the pion\, pi(1300). Furth ermore\, I will discuss new lattice results on the pion form factor. The ta lk is based on recent papers:


    [1] X. Gao\, L. Jin\, C. Kalidonis\, N. Karthik\, S. Mukherjee\, P. Petreczky\, C. Shugert\, S. S yritsyn\, Y. Zhao\, \;arXiv:2007.06590 [hep-lat]
    [2] X. Gao\, N. Kar thik\, S. Mukherjee\, P. Petreczky\, S. Syritsyn\, Y. Zhao\,
    arXiv:2101. 11632 [hep-lat]
    [3] X. Gao\, N. Karthik\, S. Mukherjee\, P. Petreczky\, S. Syritsyn\, Y. Zhao\,
    arXiv:2102.06047 [hep-lat]
    LAST-MODIFIED:20210224T171310Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211129T213000Z DTEND:20211129T223000Z DTSTAMP:20260828T094430Z UID:3drpefcn4kvjboslujbb1p1o85@google.com CREATED:20211110T185852Z DESCRIPTION:Title: Studies of Jovian Radio Emission and the Search for Extr asolar Planets/Space Weather\n\nAuthor: Tracy Clarke\, Naval Research Labor atory\n\nAbstract: The discovery of planetary radio emission from Jupiter 6 6 years ago marked the beginning of a new way to explore our solar system. This low frequency emission is powered by the interaction of the Jovian mag netosphere with the Solar wind and Galilean moon Io. All magnetized planets in the solar system have been detected through low frequency emission from their magnetospheres. Study of this emission allows not only the identific ation of the presence of planetary magnetic fields but also provies an esti mate of the planetary field strength. I will present recent studies of Jovi an decametric emission from the Long Wavelength Array. Planetary magnetic f ields may play a critical role in determining the habitability of a planet by shielding the surface from cosmic rays and the stellar wind. The search for exoplanet radio emission and space weather has come to the forefront wi th the development of new sensitive low frequency instruments and calibrati on techniques. I will highlight a few of the recent exciting results in thi s field.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211117T184910Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220908T163000Z DTEND:20220908T180000Z DTSTAMP:20260828T094430Z UID:53ffuhubl3ctor695gipregv3c@google.com CREATED:20220830T132319Z DESCRIPTION:
    Title: \;Parallel Machine Learning for Forecasti ng the \;Dynamics \;of Complex Networks

    Speaker: \;Keshav Srinivasan\, \;Applied \;Math\, UMD

    Abstract: \;Forecasting the \;dynamics \;of large\, complex networks fr om previous time series data is important in many fields\, ranging\, e.g.\, from neuroscience to power grids. However\, a straight-forward application of standard ML schemes becomes problematic\, especially as we increase the size of the network to be predicted. In this talk\, I will present a machi ne learning scheme for this task using a parallel architecture that mimics the topology of the network of interest. The utility and scalability of our method is demonstrated by using reservoir computing on a chaotic network o f oscillators. In our demonstrations\, we consider two scenarios: (a) the c onnectivity of the network is known\, and (b) the connectivity of the netwo rk is unknown \;a priori\, but may be approximately inferred fro m node time series data. \;

    Place: \;IREAP Large  \;Conference \;Room \; (ERF 1207)

    Date: \; \;Thur sday\, September 8\, 2022

    Time: \;12:30PM to 2PM&n bsp\; LAST-MODIFIED:20220830T132319Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar: Parallel Machine Learning for Forecasting the Dynami cs of Complex Networks TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T160000Z DTEND:20220406T180000Z DTSTAMP:20260828T094430Z UID:56ogu437tbve2jnc7kg6tfvtiu@google.com CREATED:20220310T181924Z DESCRIPTION:Title: Quantum algorithms for linear and non linear differential equations
    Speaker: Jin-Peng Liu (QuICS)
    Time: W ednesday\, April 6\, 2022 - 12:00pm
    Location: Virtual Via Zoom: ht tps://umd.zoom.us/j/4484328258?pwd=RitURDMvVGxXanFuSVZVWjRjOUNvUT09

    Quantum computers are expected to dramatically outperform classical com puters for certain computational problems. Originally developed for simulat ing quantum physics\, quantum algorithms have been subsequently developed t o address diverse computational challenges.

    There has been extensive previous work for linear dynamics and discrete models\, including Hamilton ian simulations and systems of linear equations. However\, for more complex realistic problems characterized by differential equations\, the capabilit y of quantum computing is far from well understood. One fundamental challen ge is the substantial difference between the linear dynamics of a system of qubits and real-world systems with continuum and nonlinear behaviors.
    < br>My research is concerned with mathematical aspects of quantum computing. In this dissertation\, I focus mainly on the design and analysis of quantu m algorithms for differential equations. Systems of linear ordinary differe ntial equations (ODEs) and linear elliptic partial differential equations ( PDEs) appear ubiquitous in natural and social science\, engineering\, and m edicine. I proposed a variety of quantum algorithms based on finite differe nce methods and spectral methods for producing the quantum encoding of the solutions\, with an exponential improvement in the precision over previous quantum algorithms.

    Nonlinear differential equations exhibit rich ph enomena in many domains but are notoriously difficult to solve. Whereas pre vious quantum algorithms for general nonlinear equations have been severely limited due to the linearity of quantum mechanics\, I gave the first effic ient quantum algorithm for nonlinear differential equations with sufficient ly strong dissipation. I also established a lower bound\, showing that nonl inear differential equations with sufficiently weak dissipation have worst- case complexity exponential in time\, giving an almost tight classification of the quantum complexity of simulating nonlinear dynamics.

    Overall \, utilizing advanced linear algebra techniques and nonlinear analysis\, I attempt to build a bridge between classical and quantum mechanics\, underst and and optimize the power of quantum computation\, and discover new quantu m speedups over classical algorithms with provable guarantees. \;
    Join Zoom Meeting
    https://umd.zoom.u s/j/4484328258?pwd=RitURDMvVGxXanFuSVZVWjRjOUNvUT09
    LAST-MODIFIED:20220327T015253Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/4484328258?pwd=RitURDMvVGx XanFuSVZVWjRjOUNvUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Jin-Peng Liu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211119T180000Z DTEND:20211119T190000Z DTSTAMP:20260828T094430Z UID:54msdmgmclikchf7464gh88go5@google.com CREATED:20210914T151241Z DESCRIPTION:Speaker: Abraham Anapolsky\, Senior Manager\, Toyota Research I nstitute

    Title: Getting from Here to There: Why Scale Bridging is Im portant

    Abstract: Scale bridging problems define many of our important materials engineering problems\, in energy systems\, alloys\, bio medical devices\, and cancer research. As engineers and scientists we have effective analytical methods for describing materials at length scales of m eters down to 10 microns\, and from atoms to the unit cell\, but in the so- called meso scale\, we observe emergent behavior with limited understanding . Our lack of understanding of phenomena on this scale makes it challenging to fulfill the promise of quantum mechanics as a design paradigm for mater ials engineering. The goal of this seminar is to stimulate discussion on a useful pedagogy for mastering scale bridging\, some examples from the Energ y and Materials group at the Toyota Research Institute will be discussed as a proxy for such a pedagogy.

    Bio:

    Abraham Anapolsky is a Senior Ma nager in the Energy and Materials Division at the Toyota Research Institute . Dr. Anapolsky received his B.S. in physics from San Francisco State Unive rsity\, and an M.S. and Ph.D. from the University of California. Dr. Anapol sky has three decades of experience in energy materials ranging from photov oltaics to batteries\, shape memory alloys\, magnetic materials and high en tropy alloys\; and numerous patents and publications in these areas.

    LAST-MODIFIED:20211109T153340Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220224T160000Z DTEND:20220224T170000Z DTSTAMP:20260828T094430Z UID:4hcm5kgbrskba6ejc0ta67u2hn@google.com CREATED:20220207T173454Z DESCRIPTION:Speaker: Dr. Lyle Isaacs\, UMCP

    Title: Cucurbit [n] uril Molecular Containers: From Basic Science to Biomedical A pplications

    Abstract: \;https://chem.umd.edu/events/cucurbitnuril-molecular-containers-basic-sci ence-biomedical-applications     LAST-MODIFIED:20220217T150541Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210408T180000Z DTEND:20210408T190000Z DTSTAMP:20260828T094430Z UID:1041vek6oqt7n09v98lacvsj08@google.com CREATED:20210331T132702Z DESCRIPTION:Seminar will be conducted via zoom.\n\nSpeaker: Jure Zupan\, Un iversity of Cincinnati\n\nTitle: New physics in muons?\n\nAbstract: In the talk I will overview the latest status of the experimental anomalies that i nvolve muons: the lepton flavor universality tests in B decays and the impl ications of the muon g-2 measurement. The overview of the experimental stat us will be followed by a selected overview of the theoretical attempts to e xplain the anomalies. LAST-MODIFIED:20210402T200428Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint UMD/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T203000Z DTEND:20220202T220000Z DTSTAMP:20260828T094430Z UID:6326a6cqbpmf6gseshdcr2irl0@google.com CREATED:20220127T174317Z DESCRIPTION:
    Please join us for the LPS Seminar Series on Wednesday\, Fe bruary 2nd\, 2022
     \;
    “Quantum error correction on a superconducting system with heavy hexagon topology”
     \;
    Maika Takita\, IBM Quantum
     \;
    Abstract: Superconducti ng qubit based systems have made tremendous strides in device performance\, from improved coherences to lowered single- and two-qubit gate errors\, an d high-fidelity mid-circuit measurements and qubit resets. In this talk\, I will present recent progress towards fault tolerant quantum error correcti on on superconducting qubit systems\, that leverages the resources from imp roved device performance. I will focus on experimental demonstrations on a heavy-hexagon topology\, an arrangement that reduces lattice connectivity c ompared to other popular low-degree parity-check codes in order to mitigate cross-talk between fixed-frequency transmon qubits. I will describe some o f the encoding\, syndrome extraction\, and decoding operations that can be tailored to this topology\, focusing on d = 2 and 3 codes. The code design\ , along with the current level of hardware noise\, place this system in a v ery favorable path for the coming years in the quest for scalable\, fault-t olerant quantum error correction. \;Our results and preliminary simulat ions highlight not only the versatility and flexibility of the underlying h eavy-hexagon topology\, but also the importance of tailoring a decoder when implementing these protocols. \;
     \;

    Bio: \; Maika T akita is a Research Staff Member at IBM Quantum\, with expertise in experim ental quantum computation. She joined IBM in 2015 after completing her Ph.D . in Electrical Engineering from Princeton University. Takita specializes i n the control\, characterization\, and benchmarking of multi-qubit quantum systems. As a co-PI of IARPA's LogiQ program\, she is also leading a team t owards implementing fault tolerant quantum error correction codes on superc onducting qubit lattices.
     \; \; \; \;

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    LAST-MODIFIED:20220127T174317Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=m1879d554593a0e0e3 f7d9c21683be665 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar\, Quantum error correction on an SC system with heavy h exagon topology\, Maika Takita\, IBM Quantum\, Wednesday\, February 2nd\, 2 022 3:30 PM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220506T190000Z DTEND:20220506T200000Z DTSTAMP:20260828T094430Z UID:7ht7l0m5kar8vqepvfc3jpt3an@google.com CREATED:20220429T173146Z DESCRIPTION:

    Regina Caputo (GSFC) 

    AMEGO-X Mission Concept

    Gamma-ray and multimessenger astrophy sics are frontiers for discovery and uniquely provide access to the extreme processes that sculpt the universe. As a priority theme of the Astro2020 D ecadal Survey report: New Messengers New Physics\, this science is poised t o revolutionize our understanding of the extreme universe. Data from NASA’s Fermi mission demonstrated that the extreme processes that produce gravita tional waves and accelerate neutrinos and cosmic rays also produce gamma ra ys. In other words\, multimessenger sources are gamma-ray sources. Now is t he time to develop a powerful mission to fill these critical capability gap s revealed by Fermi and fully capitalize on this exciting new era of multim essenger astrophysics. 

    The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) is the next logical missio n after Fermi. During its three-year baseline mission\, AMEGO-X will observ e nearly the entire sky every two orbits\, building up a sensitive all-sky map of gamma-ray sources and emission. It will also access >\;50% (<\;1 0 MeV) and >\;20% (>\;10 MeV) of the sky instantaneously\, maximizing t ransient detections and rapid alerts\, openly distributed to the astrophysi cs communities. As a result\, AMEGO-X will deliver breakthrough discoveries for a MIDEX class in areas highlighted as the highest scientific priority for Explorer-scale missions in the Astro2020 Decadal Survey Report: gravita tional waves\, multimessenger astrophysics and time-domain astronomy. This talk presents an overview of the science\, instrument\, and mission that wa s submitted in the recent 2021 NASA MIDEX Announcement of Opportunity.

    ========================================

    Carolyn Kierans (GSFC) 

    Exploring the MeV Sky with COSI

    The Compton Spectromet er and Imager (COSI) is a soft gamma-ray telescope that was recently select ed to be NASA’s next SMEX mission with a launch in 2025. COSI is designed t o uncover the source of Galactic positrons\, image diffuse emission from st ellar nucleosynthesis\, and perform polarization studies of gamma-ray burst s and compact objects. With unprecedented sensitivity in the MeV range\, CO SI is expected to provide advances in multimessenger astrophysics and revea l other sources of gamma-ray emission. In this presentation we will give an overview of COSI’s main science goals and discuss the telescope technology and maturation path through its successful balloon program.

    < span>

    Refreshments and physics discuss ion will take place prior to the seminars. 


    < p> 

    LAST-MODIFIED:20220429T173236Z LOCATION:1136 PSC SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T193000Z DTEND:20220511T203000Z DTSTAMP:20260828T094430Z UID:6tunn8gjpctcj57hishl1c9qle@google.com CREATED:20220505T160406Z DESCRIPTION:Comparisons of neutral density profile prediction s using SOLPS-ITER with experimental neutral profiles in the Alcator C-Mod tokamak

    Richard Reksoatmodjo\, \; William and Mary
     \ ;
    Abstract : Accurate modeling of edge neutral distributions in future h igh-field tokamaks has strong consequences for both fueling and pedestal sh ape predictions. We evaluate the ability of SOLPS-ITER\, a two-dimensional fluid plasma/kinetic Monte Carlo neutral code\, to accurately simulate the upstream neutral density profiles of L-mode\, I-mode\, and H-mode discharge s in the Alcator C-Mod tokamak for which experimental neutral densities hav e been inferred from direct Lyman-alpha emission measurements. To eliminate possible propagated systematic errors in the conversion of the Lyman-alpha emission data to neutral density\, we make additional parallel comparisons between the modeled Lyman-alpha emissions versus the measured emissions an d the optimized modeled electron density and temperature profiles versus Th omson scattering profiles. We further evaluate comparisons between the infe rred ionization rate profiles versus the modeled ionization rates\, as a cl osely related validation parameter. We ultimately achieve SOLPS profiles of neutral density and Lyman-alpha emissions that are well within an order of magnitude of empirical data for all three discharges\, via iterative tunin g of the perpendicular transport coefficient profiles\, providing confidenc e in the fidelity of SOLPS neutral predictions.
     \;
     \; LAST-MODIFIED:20220505T160507Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210212T200000Z DTEND:20210212T213000Z DTSTAMP:20260828T094430Z UID:1crdap4d52h2vh6dlr2bb8n2g0@google.com CLASS:PUBLIC CREATED:20210205T022502Z DESCRIPTION:Colloquium at the Department of Physics and Astronomy starts at 3:10 pm

    Speaker: Victor Yakovenko (UMD)

    Title: Economic ineq uality from a statistical physics point of view

    Abstract: \;Ineq uality is an important and seemingly inevitable aspect of the human society . Various manifestations of inequality can be derived from the concept of entropy in statistical physics. In a stylized model of monetary economy\, with a constrained money supply implicitly reflecting constrained resources \, the probability distribution of money among the agents converges to the exponential Boltzmann-Gibbs law due to entropy maximization. Our empirical data analysis shows that income distributions in the USA\, European Union\ , and other countries exhibit a well-defined two-class structure. The majo rity of the population (about 97%) belongs to the lower class characterized by the exponential ("thermal") distribution\, which we recently observed i n the data for 67 countries around the world. In contrast\, the upper clas s (about 3% of the population) is characterized by the Pareto power-law ("s uperthermal") distribution\, and its share of the total income expands and contracts dramatically during booms and busts in financial markets. Global ly\, energy consumption (and CO2 emissions) per capita around the world sho ws decreasing inequality in the last 30 years and convergence toward the ex ponential probability distribution\, as expected from the maximal entropy p rinciple. All papers are available at http://physics.umd.edu/~yakovenk/econophysics/.

    Event link \;https://physics.unh.edu/events/colloquium/economic-inequality-statisti cal-physics-point-view

    Zoom link https://unh.zoom.us/j/989 36307530?pwd=VXBPWklFRDd3MTJkT0lvTTJxbStZZz09 LAST-MODIFIED:20210205T023226Z LOCATION:University of New Hampshire\, Durham on Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquium at University of New Hampshire TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210517T140000Z DTEND:20210517T220000Z DTSTAMP:20260828T094430Z UID:415lplhaitroas8vp6m64pkm1h@google.com CREATED:20210419T190432Z DESCRIPTION:Part of the Janet Das Sarma Conference Series


    Title: "Quantum"
    Schedule: \;
    10:00 AM:&nbs p\;Immanuel Bloch\, "Realising and probing quantum matter using larg e scale quantum simulations"
    11:00 AM: \;Ignacio Cirac\, "Sim ulations with analog and digital quantum computers"
    12:00 PM: \;L ieven Vandersypen\, "Analog quantum simulating of Fermi-Hubbard physics using quantum dot arrays"
    1:00 PM: \;Andrew Childs\, "Effici ent quantum algorithm for dissipative nonlinear differential equations"
    2:00 PM: \;Markus Greiner\, "Tentative: Simulating strongly corr elated quantum materials using cold fermions in the laboratory"
    3:00 PM:  \;Maissam Barkeshli\, "Measurement-induced topological entangle ment transitions in random quantum circuits"
    4:00 PM: \;Edwin Bar nes\, "Quantum error mitigation at the level of hardware control: from spin echo to geometric space curves"
    5:00 PM: \;Garnet Chan\, "Quantum advantage and quantum chemistry"

    Zoom details email Rca wthor@umd.edu



     LAST-MODIFIED:20210505T145122Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Conference TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211012T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20211004T160000 DTSTAMP:20260828T094430Z UID:45g0cnu7c2mj3vneum43g4q0m3@google.com CREATED:20210924T113653Z DESCRIPTION:Speaker 1: 



    Advisor: 

    Title: TBD


    Abstract: TBD

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T113653Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Open TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220323T160000Z DTEND:20220323T170000Z DTSTAMP:20260828T094430Z UID:4acns3b36huqr65ps9nlfjmft9@google.com CREATED:20220207T165033Z LAST-MODIFIED:20220207T165033Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - SPRING BREAK - NO SEMIN AR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220323T150000Z DTEND:20220323T160000Z DTSTAMP:20260828T094430Z UID:6fker9p1t2vvk6qcac0jfq9aam@google.com CREATED:20220207T163441Z LAST-MODIFIED:20220207T163441Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T170000Z DTEND:20211130T183000Z DTSTAMP:20260828T094430Z UID:5q0bjevg1ml5ic9u6c0it6g800@google.com CREATED:20211116T212804Z DESCRIPTION:

    Title: \;< a>Taking the Leap and the (RF) path less traveled by

    Speaker: \;< /span>Melissa Midzor

    Aff iliation: National Institute of Standards and Technology\, Boulder\, Colora do


    Abstract: \;An obsession with magnets at a young age led Dr. Midzor to pursue a life i n physics and RF measurement techniques. \; Her career has spanned deve loping a new RF microscopy method for nanotechnology\, overcoming challenge s in electronic warfare protection against adversaries’ radars and Improvis ed Explosive Devices (IEDs)\, and improving compatibility between Federal a nd Commercial wireless systems. \; Melissa will be discussing highlight s from these projects\, and how her approach of taking career leaps\, plann ing\, and pursing her passions led to unique science and career opportuniti es. \;


    About the speaker: Since 2 018\, Melissa Midzor has worked at the National Institute of Standards and Technology (NIST) in Boulder\, Colorado. \;She is Program Manager for t he National Advanced Spectrum and Communications Test Network (NASCTN)\, a multi-agency organization chartered in 2015 to organize a national network of Federal\, academic\, and commercial partners that provides testing\, mod eling and analysis necessary to develop and deploy spectrum-sharing technol ogies and inform future spectrum policy and regulations. A native Coloradan \, Melissa received a B.A. in physics and sociology from the University of Colorado\, Boulder\, and a Ph.D. in nanotechnology from the California Inst itute of Technology supervised by Michael Roukes. Following a stint in McKi nsey &\; Company\, Melissa joined the U.S. Navy Naval Air Systems Comman d (NAVAIR)\, where she served 16 years in roles including \;Division Di rector of Electronic Warfare Integrated Laboratories at \; Naval Air Station Point Mugu\, \;and \;&n bsp\;Assistant to the Secretary of Defense Electronic Warfare and Counterme asures Office at \;the Pentagon. \;

    Attendance at JQI Career Seminars is limi ted to students\, \;postdoctoral associates \;an d junior members of staff. Lunch will be provided to participants af terward and the speaker will be available for informal discussions. \;< /span>This seminar is co-sponsored by the University of Marylan d Women in Physics\, \;htt ps://wip.umd.edu/ \; \;







    LAST-MODIFIED:20211117T164154Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Career Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T210000Z DTEND:20220420T220000Z DTSTAMP:20260828T094430Z UID:5oklshi682vv731bkoofoftv98@google.com CREATED:20220407T120732Z DESCRIPTION:S. Alan Stern
    Associate Vice President of the Space S cience and Engineering Division at Southwest Research Institute® and Princi pal Investigator of NASA's New Horizons Mission to Pluto

    Title: In H onor of Professor Mike A'Hearn: The Exploration of Pluto and the Kuiper Bel t

    NASA's New Horizons mission\, conceived in 2001 and launched in 20 06\, explored Pluto and its system of moons in 2015 and made the first reco nnaissance flyby of an ancient Kuiper Belt Object in 2019. Stern will descr ibe the project\, its scientific basis and history\, and many of the discov eries made about these frontier worlds so many billions of miles away in sp ace. The talk will be rich in stunning imagery of these newly explored plac es. Stern will also reflect on his professional relationship with Professor A'Hearn throughout his career and point out his many accomplishments.  \;
     \;
    A reception outside outside the lecture hall will begin at 4:15 pm.
     \;
    For more info: \;https://science.umd.edu/events/ahe arn-2022.html. LAST-MODIFIED:20220407T120732Z LOCATION:Edward St. John Building\, Room 0202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Inaugural Mike A'Hearn Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221123T203000Z DTEND:20221123T223000Z DTSTAMP:20260828T094430Z UID:6sf20d69o04ag7q90cjq47d98h@google.com CREATED:20220815T131457Z LAST-MODIFIED:20220815T131457Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar - NO SEMINAR - HAPPY THANKSGIVING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T160000Z DTEND:20220414T170000Z DTSTAMP:20260828T094430Z UID:7s7au74elto7orgd2h40s1vbvb@google.com CREATED:20220223T204628Z DESCRIPTION:Speaker: Vincenzo Tamma\, University o f Portsmouth\, England

    Title: \;Harnessing the ultimate quantum- enhanced sensitivity in distributed quantum sensing with squeezed light

    Abstract: Distributed quantum sensing is an exciting emerging research field aimed at harnessing quantum resources to achieve quantum-enhanced sen sitivity in the estimation of single or multiple parameters\, including tem perature\, electromagnetic and gravitational fields\, \; distributed in a given quantum network. In particular\, squeezing is a well established r esource given its feasibility and robustness to decoherence with respect to entangled sources. However\, distributed quantum sensing schemes with sque ezed light often suffer from experimental challenges\, such as limitations on the range of values of the unknown parameter to be measured\, the struct ure of the optical network encoding it\, the need to iteratively adapt such a network and the presence of photonic losses.

    We show that multi photon interference of squeezed photons with homodyne measurements can be u sed to achieve Heisenberg limited precision in the estimation of an unknown parameter of arbitrary value in an arbitrary linear network without the ne ed of iteratively adapted networks [1]. \; We demonstrate that such a t echnique can even \; be exploited in the estimation of a function of an arbitrary number of unknown distributed parameters\, whose functional expr ession can be tuned by using a simple auxiliary network [2].

    F urthermore\, we demonstrate the robustness to losses in the Heisenberg limi ted estimation of a linear superposition of unknown phases by using a singl e squeezed vacuum source and an anti-squeezing operation at a single interf erometer output [3].

    [1] G. Gramegna et al. New J. of Physics 23\, 053002(2021)\; G. Gramegna et al. Phys. Rev. Research 3\, 013152 (2021 )\; D. Triggiani\, P. Facchi\, and V. Tamma\, Eur. Phys. J. Plus 137:125 (2 022)

    [2] D. Triggiani\, P. Facchi\, and V. Tamma\, Phys. Rev. A104\, 062603 (2021)

    [3] D. Gatto\, P. Facchi and V.Tamma\, Phys. Rev. A&nbs p\;105\, 012607 (2022)\;D. Gatto\, P. Facchi and V. Tamma\, \;Phys. Rev . Research1\, 032024 (2019)

    Host: Dr. William D. Phillips

    < u>     LAST-MODIFIED:20220223T205400Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20260828T094430Z UID:43jgob7fmepirm7u603a184r7c@google.com CREATED:20220207T175756Z DESCRIPTION:Speaker: Dr. Matthew DeLisa\, Cornell University

    Title: TBA

    Abstract: \;https://chem.umd.edu/eve nts/speaker-matthew-delisa LAST-MODIFIED:20220207T175756Z LOCATION:TBA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220830T163000Z DTEND:20220830T173000Z DTSTAMP:20260828T094430Z UID:38bpa13nqgsu7ldi4ce7e9n3kg@google.com CREATED:20220829T192650Z DESCRIPTION:



    Date: \; Tuesday \, August 30\, 2022


    Venue:&nbs p\; Math Colloquium Room (3206 Kirwan Hall)

    Time: 12.30 pm


    Title: When the best pandemic models are the simplest

    Abstract:

    As a pandemic of c ovid-19 spread across the globe\, many complex\, highly detailed models hav e been developed to help policy setters make better decisions. A major goal of modeling covid-19 is to advise those in power how to react\, and only t he simplest models can be explained to those decision-makers. \;

     \; \; \; \; \; \; The data collection has made thi s epidemic among the best documented. “Best documented” does not mean “thor oughly documented”. We argue that to understand and predict the epidemic\, the simplest models are best. Major documented factors are the varying stra ins of Covid including delta and the various omicron strains. We describe t he advantages of simple models for covid-19. We say a model is \;sim ple \;if its only parameter is the average rate of contact between people in the population. This contact rate can vary over time\, depending on choices by policy setters. Transient interventions like lockdowns and in termittent mask campaigns can make the epidemic data confusing.

    LAST-MODIFIED:20220829T192650Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Mathematical Biology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T190000Z DTEND:20211118T200000Z DTSTAMP:20260828T094430Z UID:2rr0sa3o5l1q2raroho0ftgasu@google.com CREATED:20211103T173906Z DESCRIPTION:Title: Quantum Physical Unclonable Functions and Their Compreh ensive Cryptanalysis\nSpeaker: Mina Doosti (University of Edinburgh)\nTime : Thursday\, November 18\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: htt ps://umd.zoom.us/j/97616215362\n\nA Physical Unclonable Function (PUF) is a device with unique behaviour that is hard to clone due to the imperfection s and natural randomness during the manufacturing procedure\, hence providi ng a secure fingerprint. A variety of PUF structures and PUF-based applicat ions have been explored theoretically as well as being implemented in pract ical settings. Recently\, the inherent unclonability of quantum states has been exploited to derive the quantum analogue of PUF as well as new proposa ls for the implementation of PUF. Nevertheless\, the proper mathematical mo del and security framework for their study was missing from the literature. In this talk\, I will present our work on the first comprehensive study of quantum Physical Unclonable Functions (qPUFs) with quantum cryptographic t ools. First\, I introduce the formal definition and framework of qPUF captu ring the quantum analogue of all the requirements of classical PUFs. Then\, I introduce a new quantum attack technique based on the universal quantum emulator algorithm of Marvin and Lloyd that we have used to explore the vul nerabilities of quantum and certain classical PUFs leading to general no-go results on the unforgeability of qPUFs. On the other hand\, we prove that a large family of qPUFs (called unitary PUFs) can provide quantum selective unforgeability which is the desired level of security for most PUF-based a pplications. Moreover\, I elaborate on the connection between qPUFs as hard ware assumptions\, and computational assumptions such as quantum pseudorand omness in order to establish the link between these two relatively new fiel ds of research. LAST-MODIFIED:20211103T173906Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/97616215362 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Mina Doosti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T150000Z DTEND:20220404T160000Z DTSTAMP:20260828T094430Z UID:0f0ss3e1m2otrdes51d268d332@google.com CREATED:20220121T183521Z DESCRIPTION:Speaker: Subir Sachdev\, Institute for Advanced Study/Harvard University

    Title: \;Quantum spin liquids : from Rydberg atoms to the high temperature superconductors

    Abstrac t: Quantum spin liquids are remarkable phases of matter in which quantum en tanglement is\, in a precise sense\, truly long-ranged. \; I will descr ibe realization of quantum spin liquid correlations in recent experiments o n pumped Rydberg atoms trapped in arrays of optical tweezers. \; I will also describe how recent theories of quantum spin liquids in metallic stat es provide a description of photoemission observations in the mysterious 'p seudogap' state of the cuprate high temperature superconductors.

    Host: Charles Clark     LAST-MODIFIED:20220327T161828Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211014T140000 DTEND;TZID=America/New_York:20211014T153000 DTSTAMP:20260828T094430Z UID:2n7gfg0fjrtujinjjludroip31@google.com RECURRENCE-ID;TZID=America/New_York:20211014T140000 CREATED:20210924T121251Z DESCRIPTION:Title: \;1D Structures for Topological Quantum Device s


    Abstract: \;Topological states such as Majorana modes provide unique pathways to fault-tolerant quantum computi ng. Recent progress in this direction has been enabled by novel proximity e ffects between low-dimensional semiconductors and superconductors. However\ , further breakthroughs require developing a systematic understanding of th e materials systems and devices\, with a particular attention to integratin g magnetic materials with semiconductors and superconductors in 1D. In addi tion\, understanding the role of disorder is essential for achieving robust topological states. I will discuss how magnet-semiconductor nanowire hybri d devices can provide unprecedented insight into the basic effects that und erpin the realization of Majorana modes\, notably the essential\, but so fa r elusive helical state. A second key challenge is that of developing a pla tform for topological quantum computing that is not only robust at the sing le-device level\, but that simultaneously holds the potential to be scalabl e into more complex systems. To this end\, the integration of magnets with semiconductor nanowires is also uniquely promising. I will describe our eff orts to search systematically for the optimal combinations of magnetic and semiconducting low-dimensional materials\, guided by DFT calculations. Fina lly\, with regards to both robustness and scalability\, it may be useful to consider materials systems beyond semiconductor hybrid devices. I will dis cuss a conceptually new experimental approach that is semiconductor-free an d intrinsically scalable. \;

    Host: Paglione

    Oct 14: 2pm - 3:30pm: 1201 Toll Physics Bldg
    This seminar will also be broadcast via Z OOM: \; \;https://umd.z oom.us/j/91301075848 \;
    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080752Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Vlad Pribiag\, University of Minnesota TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 14_Vlad Pribiag.pptx;FMTTYPE=application /vnd.openxmlformats-officedocument.presentationml.presentation:https://driv e.google.com/file/d/1ZVsEVnVeee0086W5SROVvsPGBOIyd25-/view?usp=drive_web END:VEVENT BEGIN:VEVENT DTSTART:20220302T170000Z DTEND:20220302T180000Z DTSTAMP:20260828T094430Z UID:35g3cvgtsuluu7rf116r1hf4mp@google.com CREATED:20220207T164843Z DESCRIPTION:Speaker: David L. Green\, MSE &\; ChemE As sociate Professor\, University of Virginia

    Title: Prediction and Vis ualization of Supramolecular Phase Separation on Metallic Nanoparticles

    Abstract: \;The goal is to gain fundamental insights into the facto rs that dictate the synthesis of monolayer-protected nanoparticles and tran slate them into rational design strategies for novel functional soft materi als. He is interested in monolayer self-assembly\, polymer grafting\, and n anoparticle dispersion. He studies how to exert control over the interface of nanoparticles\, which dictates their degree of compatibility with and as sembly in soft materials\, provides reactive sites for attachment of molecu les\, such as drug payloads\, and tunes detectable properties\, such as the surface plasmon to a wavelength of interest. David Green is particularly i nterested in the development of nanoparticles coated with monolayers from m ixtures of organic molecules that may also self-assemble into advantageous patterns from supramolecular interactions. As pattern formation in self-ass embled monolayers is inextricably linked to their intermolecular interactio ns\, a key research challenge is the integration of experimental and theore tical techniques to enable \;de novo \;design of patterned nanoparticles. \; \;

    Bio: Dr. Green is a professor of Mater ials Science\, Chemical and Mechanical Engineering at the University of Vir ginia. He received his \;B.S. from Boston University in 1991\, and his& nbsp\;M.S. (1997) and \;Ph.D. from the University of Maryland (2001).

    Green's research group focuses on the synthesis of well-defined nanopartic les\, their dispersion into polymer solutions and melts\, and their suspens ion rheology.

    First\, they study the mechanisms that produce well-def ined nanoparticles and then use this knowledge to optimize for a range of i ndustrially relevant properties such as particle stability\, surface expres sion\, or catalytic activity. They are also interested in developing timely methods for determining nanoparticle growth rates inside of emulsions whic h are used in formulating a variety of commercial products like fiber-optic coatings\, automotive finishes\, and chromatographic packings.

    Secon d\, they examine how grafting uniform polymers to the interfaces of well-de fined nanoparticles affects their rheological behavior in polymer solutions and melts. With these fundamental studies\, they seek to optimize processi ng to achieve a desirable microstructure in industrial suspensions\, and to set a foundation for developing constitutive rheological models that predi ct the complex behavior of industrial suspensions. To this end\, they use r heological and rheo-optical measurements to elucidate how the interactions within model suspensions affect their flow at nano-\, micro-\, and macrosco pic length scales the full range of interactions that effect the processing of engineered materials.

     LAST-MODIFIED:20220224T155940Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211210T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211202T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211028T140000 DTSTAMP:20260828T094430Z UID:7r5kf6la3hq1lh7ri1rv4paqij@google.com CREATED:20210924T122743Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: Butch\n \nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122743Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Sheng Ran\, Washington U-St. Louis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211004T110000 DTEND;TZID=America/New_York:20211004T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211004T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Marianna Safronova\, University of Delaware

    Tit le: \;

    Novel Clocks for New Physics Searches

    Abstract: The devel opment of atomic clocks with systematic uncertainties in the 10-18 range en ables searches for the variation of fundamental constants\, dark matter\, a nd violations of Lorentz invariance. I will give an overview of dark matter searches and other fundamental physics studies with atomic and nuclear clo cks and focus on development of clocks with the highest sensitivities to ne w physics. I will discuss recent advances in theory of novel clocks based o n highly-charged ions and efforts to develop a nuclear clock. Related recen t methodology developments and resulting capabilities of the state-of-the-a rt atomic methods to compute atomic properties of complicated atomic specie s will be presented. I will also report a release of the first version of a new online portal for high-precision atomic data and computation. Future p lans to add data for more systems as well as to release computer codes are discussed.

    Host: Charles Clark \; LAST-MODIFIED:20220617T080654Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T160000 DTEND;TZID=America/New_York:20210125T170000 DTSTAMP:20260828T094430Z UID:7rcivgcj7b9nfuj8o0rivr3vn0@google.com RECURRENCE-ID;TZID=America/New_York:20210125T160000 CREATED:20210113T142920Z DESCRIPTION:Seminar will be conducted via zoom

    Speaker: Camila Macha do\, DESY

    Title: "On-shell amplitudes for model building"

    Abs tract: On-shell methods have been shown to be a powerful tool to compute hi gher-point and loop amplitudes. However\, most of the time we hear about th e applications for renormalizable theories. In this talk\, I will give an i ntroduction to spinors and to (massless/massive) amplitudes and show that w e can indeed apply these methods for general effective field theories. Afte rwards\, I am going to discuss how these methods make it easier to build a dark matter model with a massive particle with general spin and work out th e phenomenology.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20210120T143445Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T163000Z DTEND:20211013T190000Z DTSTAMP:20260828T094430Z UID:1uqf30bk40fgi08v2jkqvcq89r@google.com CREATED:20211008T140359Z DESCRIPTION:Title : "Looking forward to new physics at the LHC"

    Spea ker Name: Felix Kling
    Speaker Institution : SLAC

    Abstract : Physi cs searches and measurements at high-energy collider experiments traditiona lly focus on the high-pT region. However\, if particles are light and weakl y-coupled\, this focus may be completely misguided: light particles are typ ically highly collimated around the beam line\, allowing sensitive searches with small detectors\, and even extremely weakly-coupled particles may be produced in large numbers there. In the upcoming run of the LHC\, the FASER experiment will use the opportunity and extend the LHC's physic potential by searching for long-lived particles and studying neutrino interactions at TeV energies. A continuation of this forward physics program for the HL-LH C era\, in the form of a 'forward physics facility' with larger scale exper iments\, is currently under discussion. In this talk\, I will present the p hysics potential of these experiments for new physics searches\, neutrino p hysics\, QCD and astro-article physics aiming to stimulate a fruitful discu ssion with my audience.

    Lunch at 12:30\; talk at 1:30

    Name: S ally Megonigal
    E-Mail: \;smegonig@ umd.edu LAST-MODIFIED:20211008T140359Z LOCATION:https://zoom.us/j/96801941719?pwd=Wm16MnplYzJYVTZ4K1BocE80Yndxdz09 (Meeting ID: 968 0194 1719\, with Passcode: 1866 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles (Talk begins at 1:30pm) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210308T210000Z DTEND:20210308T220000Z DTSTAMP:20260828T094430Z UID:081bqrtt7dpl9tctio1bhaquim@google.com CREATED:20210113T164300Z DESCRIPTION:Speaker: Daniel Egana-Ugrinovic\, Perimeter Institute

    Ti tle:Sources of Low-Energy Events in Low-Threshold Dark Matter Detectors


    Abstract: In recent years\, searches for dark matter with sub-GeV m asses have been performed by a variety of novel experiments that have reach ed the low-energy thresholds required for detection. \;
    Most of thes e experiments have observed a large amount of background events of unknown origin\, which significantly hinder their discovery reach.
    In this talk\ , we demonstrate that a significant fraction of these events are due to low energy photons created by tracks passing through detector materials via th e Cherenkov process and radiative recombination. In particular\, we demonst rate that these processes can explain the totality of the previously unacco untable events at SENSEI and SuperCDMS HVeV. In addition\, we show that the se novel backgrounds are rather universal\, so they are a concern for both current and future proposed experiments employing different detection techn ologies. Having identified these backgrounds\, we demonstrate that concrete strategies can be implemented at upcoming detectors to reduce them\, enhan cing in this way their discovery potential.
    For zoom link please email < a href="mailto:mknouse@umd.edu">mknouse@umd.edu LAST-MODIFIED:20210303T150151Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T180000Z DTEND:20220404T190000Z DTSTAMP:20260828T094430Z UID:2jvhf05ri29ooh7bsb8r5hj4ja@google.com CREATED:20220331T125812Z DESCRIPTION:Title: Quantum Computation and Cryptography: a changing landscape
    Speaker: Andrea Coladangelo (Simons Institute for the Theory of Computing)
    Time: Monday\, April 4\, 2022 - 2:00pm
    Virtual Via Zo om: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09

    Quantum computers will reshape the landscape of cryptography. On t he one hand\, they threaten the security of most modern cryptosystems. On t he other\, they offer fundamentally new ways to realize tasks that were nev er before thought to be possible. Crucially\, cryptography is also a powerf ul lens through which to understand quantum computation. In this talk\, I w ill explore the interplay between quantum computation and cryptography\, an d the many exciting questions at this intersection. I will describe example s that leverage quantum computers to protect against coercion in online ele ctions\, and to prevent piracy of software. LAST-MODIFIED:20220331T125812Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSy tQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Andrea Coladangelo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221103T150000Z DTEND:20221103T160000Z DTSTAMP:20260828T094430Z UID:6eob8mplet96acrrqsfjspus64@google.com CREATED:20220804T140642Z DESCRIPTION:Speaker: Dr. Weiping Tang\, University of Wisconsin-Madison\n\n Title: New Synthetic Methods in Carbohydrate Chemistry and Drug Discovery b y Targeted Protein Degradation LAST-MODIFIED:20220804T140642Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211015T160000Z DTEND:20211015T164500Z DTSTAMP:20260828T094430Z UID:3js7snjlmaimthhkh1fgpggvb9@google.com CREATED:20211007T230703Z DESCRIPTION:Title: Experimental simulation of para-particle dynamics\nSpea ker: Cinthia Huerta (JQI/Los Alamos National Laboratory)\nTime: Friday\, O ctober 15\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https ://umd.zoom.us/j/99484119207\n\nQuantum mechanics allows for a consistent f ormulation of particles that are neither bosons nor fermions. In this talk\ , I’ll present a particular example of those particles\, the so-called para -particles\, which arise as a generalization of the usual bosons and fermio ns. Even though these particles are unlikely to be present in nature\, a qu antum system involving a spin-½ degree of freedom coupled to two bosonic mo des yields a Hamiltonian that describes para-bosons and para-fermions. Duri ng the talk\, I’ll present the analog simulation of para-particle oscillato rs with a single trapped ion by tailoring the native couplings of two ortho gonal motional modes in the trap\, as well as its digital implementation on a trapped-ion quantum computer. Our results reproduce the well-defined dy namics for para-bosons and para-fermions of even order\, demonstrates the f ull controllability of para-particle oscillators using a trapped-ion experi ment\, and represent an opportunity for the verification of previously prop osed and future para-particle applications.\n\nPizza and drinks served afte r the talk. LAST-MODIFIED:20211007T230703Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Cinthia Huerta TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220912T190000Z DTEND:20220912T200000Z DTSTAMP:20260828T094430Z UID:15uqsmiqvh0meq681tv9i1vsen@google.com CREATED:20220831T185734Z DESCRIPTION:

    Deterministic source of indistinguishable photons in a cl uster state

    Dr. David Gershoni

    Physics Department\, Technion\, Haifa\, Israel< /p>

    Monday\, September 12\, 2022\, 3:00 pm – 4:00 pm (EDT)< /p>

    Location: PSC 3150 or Teams (Click here to join the meeting)

     \;

    Abstract:

    The ability to produce entangled particles in controllable manners is essential for any quantum technology.& nbsp\; Entanglement between light particles: photons\, is particularly cruc ial for quantum communication due to the light's noninteractive nature and long-lasting coherence. \; Resources producing entangled multi-photon c luster states will enable communication between remote quantum nodes since the inbuilt redundancy of cluster photons allows repeated local measurement s\, compensating for losses and probabilistic-Bell measurements. \; For feasible applications\, the cluster generation should be fast\, determinis tic\, and most importantly\, its photons - indistinguishable\, permitting m easurements and clusters fusion by interfering photons. \; Using period ic excitation of a semiconductor quantum dot confined spin\, we demonstrate the first multi-indistinguishable-photon cluster\, featuring genuinely inf inite length\, deterministic\, gigahertz generation rate\, and optimized en tanglement-length of 10 photons. \; The photons indistinguishability op ens new possibilities for scaling up the cluster's dimensionality either by fusion and/or by time-delayed feedback. \; Our first demonstration exc eeds the minimal resource quality requirement for constructing quantum repe aters for quantum communication. \; Nevertheless\, further significant improvements both in entanglement length and photon indistinguishability ar e feasible\, by enhancing the radiative rate using the Purcell effect.

     \;

    For more information\, p lease contact Garnett Bryant\, (garnettb@ umd.edu)

    LAST-MODIFIED:20220831T185734Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - David Gershoni TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211028T150000Z DTEND:20211028T163000Z DTSTAMP:20260828T094430Z UID:1u93n3uv051fbcc60lscrqk8io@google.com CREATED:20211026T151315Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Christina Aidala\, University of Michigan


    Title: Studying Hadronization at LHCb


    Abstract: A key question in quantum chromodynamics (QCD) is how to relate the quark and gluon degrees of freedom of QCD to the hadrons we can observe in nature. A great deal of effort over more than half a century ha s been dedicated to understanding and describing hadron structure\, in part icular proton structure\, in terms of partonic constituents. Much less att ention has been focused thus far on the inherently dynamical process of had ron formation from colored degrees of freedom. The LHCb experiment at CERN \, with its outstanding hadron identification capabilities\, offers unprece dented opportunities to study hadronization in a high-energy hadronic colli sion environment. Current results and future prospects will be discussed. LAST-MODIFIED:20211026T151315Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T210000Z DTEND:20211110T223000Z DTSTAMP:20260828T094430Z UID:63a35j9ouimi3diqbci1j6sl99@google.com CREATED:20211103T140122Z DESCRIPTION:Title : "Improving LIGO Searches using Data Quality Information "

    Speaker Name: Max Trevor
    Speaker Institution : University of Ma ryland

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211103T140122Z LOCATION:PSC Room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211112T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211104T140000 DTSTAMP:20260828T094430Z UID:60ve4r7fj59rgcs9pjjsum2rsh@google.com CREATED:20210924T122442Z DESCRIPTION:Title: TBA\nAbstract: TBA\n\n\nHost: Paglione\n \nNote: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122442Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Peter Hirschfeld\, University of Florida TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220207T160000 DTEND;TZID=America/New_York:20220207T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220207T160000 CREATED:20220131T204640Z DESCRIPTION:
    Title: Evolution of Charge Order in Ba(1-x)SrxAl4
    Abstra ct: The BaAl4 type structure hosts a variety of interesting and exotic prop erties. Recent results have shown an emergence of CDW order in SrAl4 at 243 K\, together with a hysteretic structural transition at 87K that is thought to be a structural transition to a monoclinic system. The tetragonal struc ture of BaAl4 has also recently been shown to have topologically non-trivia l bands and has lattice parameters very close to SrAl4. In order to study t he interplay between these features we have done a chemical substitution st udy to track the reported transitions. We have performed electrical resisti vity measurements\, along with x-ray and neutron scattering on the Ba(1-x)S rxAl4 family. We show a suppression of the CDW order with increased Ba subs titution. Neutron scattering and x-ray measurements show the nature of the CDW.



    In-Person Location: Toll Ph ysics Room # 1201
    Time: 4pm -5:30pm

    < u>
    Zoom LInk: \;https://umd.zoom.us/j/97265681008 LAST-MODIFIED:20220204T165743Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220314T203000Z DTEND:20220314T213000Z DTSTAMP:20260828T094430Z UID:3proibl9lh2rguumn7biaif4a1@google.com CREATED:20220228T173301Z DESCRIPTION:Title: Shock Acceleration of Cosmic Ra ys in the Inhomogeneous Interstellar Medium

    Speaker: \;Si yao Xu\, Institute for Advanced Study

    Abstract: With the development of multi-messenger astronomy and the detection of astrophysical neutrinos\ , we are in a golden age of new cosmic ray (CR) measurements and studies. S upernova remnants are believed as the leading candidate for the source of G alactic CRs. Recent observations\, however\, challenge the well-developed t heory of shock acceleration of CRs in supernova remnants. I will reexamine the assumptions in the standard shock acceleration model and discuss the ke y missing physics for shocks propagating in the turbulent and inhomogeneous interstellar medium. A more realistic shock acceleration model holds the p romise to understand the observational puzzles and the origin of Galactic C Rs.

    Notes: Join the meeting at 4:15 for meet and greet.  \;Visit  \;https://bit.ly/2PmJoT6&n bsp\;for access     LAST-MODIFIED:20220228T173516Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T160000 DTEND;TZID=America/New_York:20211129T173000 DTSTAMP:20260828T094430Z UID:6bit2fdbcs40kg03b06pfsulvd@google.com RECURRENCE-ID;TZID=America/New_York:20211129T160000 CREATED:20210924T114100Z DESCRIPTION:Speaker1 : Jarryd Allyn Horn
    Advisor: Johnpierre Paglione

    Title: Superconducting and normal state properties of Ni-Bi bin ary system

    Abstract: \;Superconductivity in the bismuth-n ickel system has been of interest due to both the discovery of triplet p-wa ve superconductivity in bilayer films and the possible competition between superconductivity and magnetic order that has been measured in single-cryst al NiBi3. While previous literature suggests that the presence of amorphous nickel may be the source of the previously reported ferromagnetic order in NiBi3\, the effect of bismuth impurities on the electronic properties are rarely addressed. Understanding the role of these extrinsic effects calls f or a more careful investigation of the electronic properties of NiBi3. In o rder to address this\, we have grown NiBi3 samples by bismuth flux (as have all previously reported NiBi3 single crystal samples) as well as by chemic al vapor transport (CVT). In this talk\, I present magneto transport studie s of flux- and CVT-grown NiBi3 samples which reveal large discrepancies in the electronic properties both between samples and between different sectio ns of the same sample that suggest that bismuth impurities play a significa nt role in the normal state and superconducting properties of NiBi3. In add ition\,  \;will also report on recent measurements of the superconducti ng and normal state properties of NiBi grown by Bismuth flux.



    Speaker 2: Aaron Somoroff
    Advisor: Vladimir Manucharyan

    Tit le: Quantum Computing with Fluxonium

    Abstract: Among the main obstac les in realizing a quantum processor based on superconducting circuits are increasing quantum coherence times and the anharmonicity of the spectrum. I report our group's progress in improving coherence and control of fluxoniu m superconducting circuits with optimization of the circuit's spectrum and enhancements in fabrication. I demonstrate a device with coherence time T2 exceeding 1 millisecond and an average single qubit gate fidelity greater t han 99.99% [1]. This coherence time is still limited by dielectric loss and can be improved by further mitigating material losses. The high gate fidel ity is readily achievable due to the high anharmonicity inherent to fluxoni um. Finally\, I will present our recent work on scaling up from the single- qubit level to demonstrating two-qubit gates with capacitively coupled flux onium circuits [2].


    [1] A. Somoroff et al. arXiv:2103.08578 (202 1)
    [2] Q. Ficheux et al. Phys. Rev. X 11\, 021026 (2021)

    Note: th ere will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080626Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jarryd Allyn Horn/Aaron Somoroff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210322T200000Z DTEND:20210322T213000Z DTSTAMP:20260828T094430Z UID:65njgc14i5dr0qnkgf97rq1qcb@google.com CREATED:20210222T185759Z DESCRIPTION:Speaker: Pampa Rani Mandal\, UMD

    Title:Highly sensitive heat flux sensor based on the thermoelectric effect of YBa2Cu3O7 (YBCO) Fi lm

    Abstract: 

    Heat flux measurements are of great value in many th ermal and heat-transfer engineering systems such as vehicle thermal protect ion and propulsion systems. The direct measurement of heat flux can be acco mplished by differential temperature sensors\, which measure a spatial temp erature gradient proportional to heat flux. One typical and widely used typ e is a thin film thermopile sensor. The thermoelectric thin film material i s described\, characterized by anisotropic coefficients of thermoelectricit y\, which is also referred to as atomic layer thermopile (ALT). The working principle of the atomic layer thermopile (ALTP) sensor is based on a therm oelectric field created by a temperature gradient across the film. Here we present the design and working principle of high temperature superconductor YBCO thin film\, which is a heat flux sensor that generates an electrical signal proportional to the total heat rate applied to the surface of the fi lm. In YBa2Cu3O7 thin film\, there is a laser induced voltage when shining light pulses from a laser onto the surface of films. The fast frequency res ponse of YBCO allows time-resolved heat flux measurements. 




    Advisor: Greene


    Join Zoom Meeting
    https ://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRCTU5UcHlWTThtcEZSdz09
    Meeting ID: 969 7573 5470
    Passcode: 005596 LAST-MODIFIED:20210222T185759Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Pampa Rani Mandal\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T210000Z DTEND:20211216T220000Z DTSTAMP:20260828T094430Z UID:17dot1r7ap86embleskfhg1j83@google.com CREATED:20211214T150500Z DESCRIPTION:Speaker: Dr. Kostyantyn Kechedzhi


    T itle: Many-body Physics with NISQ superconducting processors

    Abstract: Recent demonstration of the first beyond classical quantum computation with a programmable superconducting quantum processor [1] open s the path to discovery of new quantum physics phenomena using these hardwa re systems. Gate model quantum computers used in [1] realize complex multi- qubit evolution in terms of discrete gates\, elementary one and two qubit u nitary operations\, practically realized by a local time-dependent control Hamiltonian. In this talk we overview the recent many-body physics experime nts implemented on these processors. We will specifically focus on the theo ry and experimental data describing quantum circuit kinetics in such system s\, which answers the following question: how does a system initialized in a product state generate highly entangled states and in the case of a non-i ntegrable system approach universal random matrix statistics? We characteri ze circuit kinetics using time-dependent evolution of out-of-time-order cor relators (OTOC) and their ensemble variance. We demonstrate that dynamics o f an ensemble average OTOC can be mapped onto a classical dynamical process akin to a population dynamics in biology. OTOC variance on the other hand is subject to a “sign problem” and therefore evades efficient classical des cription. We use ensemble average OTOC to verify hardware output\, whereas OTOC variance provides a signature of operator entanglement generated in th e system [2].


    [1] Arute et. al. Nature\, Vol 574\, 505 (2019)

    [2] Mi et. al. Science 2021 (10.1126/science.abg5029) arXiv:2101.08870

    Please contact Eri ka Martin (emartin3@umd.edu) for any questions. LAST-MODIFIED:20211214T150500Z LOCATION:ATL4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210308T210000Z DTEND:20210308T223000Z DTSTAMP:20260828T094430Z UID:10fkaof4rhu5vcodqi337lo0er@google.com CREATED:20210219T221656Z DESCRIPTION:Speaker: Haonan Xiong\nTitle: Two-qubit gates on fluxonium\nAbs tract:\nSwitching the interaction between qubits on-demand and with minimal resources is essential for scalable quantum computing. In superconducting circuits\, the weak anharmonicity of transmons creates many design challeng es\, leading to more complex circuits and pulse protocols\, slower gates\, and higher gate errors. Here we describe a minimalistic scheme to control i nteractions between strongly-anharmonic fluxonium qubits\, connected by a p ermanent capacitive link. Specifically\, we show that off-resonant driving of non-computational transitions in either qubit induces a clean ZZ-interac tion due to ac-Stark shifts of the four computational levels. With proper f requency and amplitude\, the drive can cancel the static ZZ-interaction. We also demonstrate controlled-Z gates and other controlled-phase gates betwe en capacitively coupled fluxonium qubits. The gate is activated by using no n-computational transitions 10-20 and 11-21. The measured gate error less t han 0.01 is limited by decoherence\, which will likely improve in the next generation devices. Architectural advantages of low-frequency fluxoniums in clude long qubit coherence time\, weak hybridization in the computational s ubspace\, suppressed residual ZZ-coupling rate\, and absence of either exce ssive parameter matching or complex pulse shaping requirements. Our demonst ration generally applies to strongly-anharmonic qubits\, and it opens a new route for reducing errors and increasing circuit depth of quantum algorith ms executed on fluxonium-based processors.\n\nAdvisor: Vladimir Manucharyan \n\n\n\n\n\n\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/96975735470?pwd=V3 lPTkdYTHRCTU5UcHlWTThtcEZSdz09\n\nMeeting ID: 969 7573 5470\nPasscode: 0055 96 LAST-MODIFIED:20210219T221656Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Haonan Xiong\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T150000Z DTEND:20220509T160000Z DTSTAMP:20260828T094430Z UID:6iqhu3inbc4nect1ol56sm7j01@google.com CREATED:20220502T165904Z DESCRIPTION:Speaker: Andrey Grankin\, UMD

    Title: Enhanceme nt of superconductivity with external phonon squeezing

    Abstract: Squeezing of phonons due to the nonlinear coupling to electrons is a way t o enhance superconductivity. In this talk I will present a model of quadrat ic electron-phonon interaction in the presence of phonon pumping and an add itional external squeezing. I will show that the interference between the t wo driving sources can lead to a stronger electron-electron attraction. Thi s allows for the enhancement of superconductivity\, which is shown to be ma ximal on the boundary with the dynamic lattice instabilities caused by driv ing. The considered model can be implemented in several experimental platfo rms.


    Speaker: Aditya N. S harma\, UMD

    Title: Precision-enhanced displacement measure ments using correlated photon pairs

    Abstract: Split detection is a standard experimental scheme for measuring positional displacements. In a typical setup\, a laser beam is reflected from the object being probed an d then sent to a photodetector that is split into left (L) and right (R) ha lves: the normalized difference signal (R-L)/(R+L) is then proportional to the object’s horizontal displacement. The maximum precision achievable usin g this method is limited by the inverse of the beam width. In this talk\, I will present our experimental demonstration of a proposal to evade this li mitation using split detection of correlated photon pairs. The techniques d iscussed here may prove useful in measurement scenarios requiring high sens itivity at low light intensity.
     LAST-MODIFIED:20220504T134426Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210223T160000 DTEND;TZID=America/New_York:20210223T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210223T160000 CREATED:20200116T204737Z DESCRIPTION:Meeting Recording: https://umd.hosted.panopto.com/Panopt o/Pages/Viewer.aspx?id=75dcd4be-b896-4983-83bb-acd801778030

    Zoom lin k: https://umd.zoom.us/j/92661457651?pwd=RTI5OXZ4azFZRnVyRExubjlzS1l3 Zz09

    Meeting ID: 926 6145 7651
    Passcode: 89593

    Speake r: William Detmold\, MIT

    Title: The secret life of quarks

    Abs tract: Quarks and gluons are the fundamental constituents of most of the vi sible matter in the Universe but they are never detected directly in experi ment. Understanding how protons\, neutrons\, nuclei and their more exotic c ousins emerge from the quantum fluctuations of quarks and gluons is a grand challenge in theoretical physics. At the same time\, quarks and gluons hol d they key to interpreting some of the most sensitive searches for new phys ics beyond the paradigm of the Standard Model of particle physics. I will e xplore how calculations on the worlds largest supercomputers are providing insight into the emergence of the structure of matter and the nature of nuc lei at their deepest level and delivering critical inputs into searches for new physics at the LHC and in laboratory based searches for dark matter.
    Host: Zohreh Davoudi LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Link - https://umd.zoom.us/j/92661457651?pwd=RTI5OXZ4azFZRnVy RExubjlzS1l3Zz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210318T140000 DTEND;TZID=America/New_York:20210318T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201204T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:3iicjv12e2mnpubnkk1l2d0c2r@google.com CREATED:20210301T221029Z DESCRIPTION:Speaker: Qimiao Si\, Rice University

    Iron-based Super conductivity\, Multi-orbital Correlations and The Tale of d+d Pairing

    Strongly correlated electron systems often show bad-metal behavior\, as op erationally specified in terms of a resistivity at room temperature that re aches or exceeds the Mott-Ioffe-Regel limit. Iron-based superconductors pre sent a striking case study. Their bad metallicity implicates orbital-select ive electron correlations and\, at the same time\, leads to short-range fru strated spin-exchange interactions. These features\, in turn\, have importa nt consequences for the superconducting pairing. One is a quasi-degeneracy in various pairing channels\, and another is the emergence of the so-called orbital-selective pairing [1]. These issues will be introduced in the talk . I’ll then go on to present a unusual pairing state dubbed “d+d” pairing [ 2\,3]\, and describe how its matrix structure in the orbital space has a su rprising formal analogue with its spin-space counterpart in the B-phase of the 3He superfluid [2]. I’ll make the case that the d+d state describes cer tain iron-selenide superconductors (that are among the group of highest Tc iron-based superconductors). In a twist befitting the aspired universal und erstanding across strongly correlated superconductors\, the d+d pairing sta te turns out [2] to also solve a serious new riddle that recently arose in the heavy fermion system CeCu2Si2\, the very first unconventional supercond uctor ever discovered.


    [1] Q. Si\, R. Yu and E. Abrahams\, Nature Reviews Materials 1\, 16017 (2016).

    [2] E. M. Nica and Q. Si\, Npj Q uantum Materials 6\, 3 (2021).

    [3] E. M. Nica\, R. Yu\, and Q. Si\, N pj Quantum Materials 2\, 24 (2017)



    Host: Jeff Lynn

    Link : https://umd.zoom.us/j/91251230757?pwd =MkhFREJrUXNTekVZTTRGQ244M1VBZz09

    Meeting ID: 912 5123 0757
    Password:   558484

    LAST-MODIFIED:20210301T221029Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Qimiao Si\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220425T160000 DTEND;TZID=America/New_York:20220425T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220425T160000 CREATED:20220131T204640Z LAST-MODIFIED:20220131T205404Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220216T160000Z DTEND:20220216T170000Z DTSTAMP:20260828T094430Z UID:07iggfkpk5qbdodrk08cobijj1@google.com CREATED:20220208T183340Z DESCRIPTION:Speaker: \; Professor Bingqing Cheng\, Institute of Science and Technology\, Austria
    Web: \;https://sites.google.com/site/tonicbq/people< br>
    Title: Predicting Material Properties With the Help of Machine Learn ing

    Abstract: A central goal of computational physics and chemistry is to predict material properties using first-principles methods based on t he fundamental laws of quantum mechanics. However\, the high computational costs of these methods typically prevent rigorous predictions of macroscopi c quantities at finite temperatures\, such as chemical potential\, heat cap acity and thermal conductivity. \;In this talk\, I will first discuss h ow to enable such predictions by combining advanced statistical mechanics w ith data-driven machine learning interatomic potentials. As an example\, we computed the phase diagram of water from density functional theory at the hybrid level\, accounting for thermal fluctuations\, proton disordering and nuclear quantum effects. As applications in high-pressure physics\, we sim ulated the high-pressure hydrogen system and found supercritical behaviour above the melting line\, and mapped the phase diagram of superionic water. Besides thermodynamic properties\, I will talk about how to compute the hea t conductivities of liquids just from equilibrium molecular dynamics trajec tories. \;During the second part of the talk\, I will rationalize why m achine learning potentials work at all\, and in particular\, the locality a rgument. I'll show that a machine learning potential trained on liquid wate r alone can predict the properties of diverse ice phases\, because all the local environments characterising the ice phases are found in liquid water.

    Virtual Link: \; \;http://go.umd.edu/pchem_seminars LAST-MODIFIED:20220208T183340Z LOCATION:Virtual link below SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T203000Z DTEND:20220328T213000Z DTSTAMP:20260828T094430Z UID:63nr9cfdbhs8r92vrk19dis2j6@google.com CREATED:20220308T162933Z DESCRIPTION:Title: \;Extreme AGN outbursts in galaxy cluster s

    Speaker: Simona Giacintucci\, Naval Research Laboratory

    Abs tract: Clusters of galaxies are the largest\, gravitationally-bound structu res in the Universe. The space between the galaxies is filled by hot ionize d gas -- the intra-cluster medium (ICM) -- that emits X-ray radiation. In t he cores of many clusters\, the ICM is dense enough to cool very rapidly\, on a timescale shorter than the cluster’s lifetime. This cooling process sh ould deposit large amounts of cold gas in the cluster centers. However\, th ere is little evidence for such vast quantities of cool gas\, suggesting a compensatory source of heat. The favored mechanism is heating by the Active Galactic Nucleus (AGN) harbored in the cluster’s central galaxy. AGN jets blow radio bubbles and inject copious amounts of energy into the ICM in the form of relativistic plasma as well as mechanical energy. Signs of AGN act ivity (e.g.\, X-ray cavities filled by the radio bubbles) are seen in most cluster cores. However\, the precise mechanism by which the AGN heats the I CM is still unclear. Complicating the picture is the recent finding that th e most powerful AGN outbursts observed in the X-rays appear to deposit most of their energy at a certain distance from the center\, outside the region of rapid cooling. A spectacular example is the Ophiuchus cluster\, where a giant (~500 kpc across) cavity in the X-ray gas has been created by the bl ast of an extremely energetic AGN outburst occurred a few hundred million y ears ago. In this talk\, I will present new deep radio and X-ray images of this exceptional fossil of the most energetic AGN outburst seen in any gala xy cluster. It may be an early example of a new class of sources to be unco vered by deeper radio and X-ray observations of galaxy clusters.

    Notes: \;Join the meeting at 4:15 for meet and gree t.  \;Visit https://bit.ly/2PmJoT6< /u> \;for access     LAST-MODIFIED:20220308T162958Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T170000Z DTEND:20220408T174500Z DTSTAMP:20260828T094430Z UID:2f6lipo3t93vu1depto7svv10b@google.com CREATED:20220330T005135Z DESCRIPTION:Title: Equivalence between fermion-to-qubit mappings in two sp atial dimensions\nFriday Quantum Seminar\nSpeaker: Yijia Xu (QuICS)\nTime: Friday\, April 8\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoo m: https://umd.zoom.us/j/96160177762\ n\nWe argue that all locality-preserving mappings between fermionic observa bles and Pauli matrices on a two-dimensional lattice can be generated from the exact bosonization (arXiv:1711.00515)\, whose gauge constraints project onto the subspace of the toric code with emergent fermions. Starting from the exact bosonization and applying Clifford finite-depth generalized local unitary (gLU) transformation\, we can achieve all possible fermion-to-qubi t mappings (up to the re-pairing of Majorana fermions). In particular\, we discover a new super-compact encoding using 1.25 qubits per fermion on the square lattice\, which is lower than any method in the literature. We prove the existence of fermion-to-qubit mappings with qubit-fermion ratios 1+1/2 k for positive integers k\, where the proof utilizes the trivialness of qua ntum cellular automata (QCA) in two spatial dimensions. When the ratio appr oaches 1\, the fermion-to-qubit mapping reduces to the 1d Jordan-Wigner tra nsformation along a certain path in the two-dimensional lattice. Finally\, we explicitly demonstrate that the Bravyi-Kitaev superfast simulation\, the Verstraete-Cirac auxiliary method\, Kitaev'\;s exactly solved model\, t he Majorana loop stabilizer codes\, and the compact fermion-to-qubit mappin g can all be obtained from the exact bosonization.\n\n(Pizza and refreshmen ts will be served after the talk.) LAST-MODIFIED:20220330T005135Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Yijia Xu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210311T140000 DTEND;TZID=America/New_York:20210311T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20201208T045959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:4e09fr5671jmauctoneobnrki1@google.com CREATED:20210129T182421Z DESCRIPTION:Speaker: Weiwei Xie\, Rutgers University

    Title: Chemistr y Perspectives to Novel Quantum Materials
    Abstract: 

    Design and di scovery of new quantum materials will accelerate the development of new tec hnologies in the future. I will report my group research progress in the pa st 4 years\, mainly focusing on the new superconductors and new magnetic to pological quantum materials. My group recently discovered several new super conductors. I will explain our interpretation of this work. More importantl y\, we are trying to use chemical bonding concept to predict the existence of superconductivity in the materials. Magnetic topological quantum materia ls (MTQMs) can give rise to forefront electronic properties such as the qua ntum anomalous Hall effect\, axion electrodynamics and Majorana fermions. I n our group\, we used chemistry electron count rules and structure-property relationship to design new MTQMs. I will describe how to design and prove the material candidate as a new MTQM from both experimental and theoretical aspects and show how topological electronic states and magnetism interplay in the new material.  


    Relevant papers:


    1. Gui\, X.\, Klein\, R.A.\, Brown\, C.M.\, Xie\, W. “Chemical Bonding Governs Complex Ma gnetism in MnPt5P” Inorg. Chem. 2021\, 60(1)\, 87-96. 

    2. Gui\, X.\, Chang\, T.R.\, Wei\, K.\, Daum\, M.J.\, Graf\, D.E.\, Baumbach\, R.E.\, Mou rigal\, M.\, Xie\, W. “A Novel Magnetic Material by Design: Observation of Yb3+ with Spin-1/2 in YbxPt5P.” ACS Central Science\, 2020\, 6(11)\, 2023-2 030.

    3. Gui\, X.\, Xie\, W. “Crystal Structure\, Magnetism\, and Elec tronic Properties of a Rare-Earth-Free Ferromagnet: MnPt5As.” Chem. Mater. 2020\, 32(9)\, 3922-3929.

    4. Gui\, X. et. al. “A New Magnetic Topolog ical Quantum Material Candidate by Design.” ACS Central Science\, 2019\, 5( 5)\, 900-910.

    5. Gui\, X.\, Sobczak\, Z.\, Chang\, T.R.\, Xu\, X.\, H uang\, A.\, Jia\, S.\, Jeng\, H.T.\, Klimczuk\, T.\, Xie\, W. “Superconduct ing SrSnP with Strong Sn–P Antibonding Interaction: Is the Sn Atom Single o r Mixed Valent?” Chem. Mater. 2018\, 30(17)\, 6005-6013.

    6. Xie\, W.\ , Luo\, H.\, Phelan\, B.F.\, Klimczuk\, T.\, Cevallos\, F.A.\, Cava\, R.J. “Endohedral gallide cluster superconductors and superconductivity in ReGa5. ” PNAS\, 2015\, 112(51)\, E7048-E7054.





    Host: N. Butch
    For the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210129T182421Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Weiwei Xie\, Rutgers University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210322T140000Z DTEND:20210322T150000Z DTSTAMP:20260828T094430Z UID:3t5t7s33baqpt30mujrhfrbscp@google.com CREATED:20210319T202350Z DESCRIPTION:Title:  Computability and compression of nonlocal games\n\nSpea ker:  Sajjad Nezhadi (University of Maryland)\nLocation: \n\nVirtual Via Zo om: https://umd.zoom.us/j/94516883349?pwd=Qnc4NFdWNzMzVU5NS0dqbW4vdy93dz09\ n\n\nAbstract:  \nRecently\, works such as the landmark MIP*=RE paper by Ji et. al. have established deep connections between computability theory and the power of nonlocal games with entangled provers. Many of these works st art by establishing compression procedures for nonlocal games\, which expon entially reduce the verifier's computational task during a game. These comp ression procedures are then used to construct reductions from uncomputable languages to nonlocal games\, by a technique known as iterated compression. \n\nIn this talk\, I will introduce and contrast various versions of the co mpression procedure and discuss their use cases. In particular\, I will dem onstrate how each can be used to construct reductions from various language s in the first two levels of the arithmetical hierarchy to complexity class es defined using entangled nonlocal games. Time permitting\, I will also go through a high-level overview of some ingredients involved in performing c ompression.\n\nTopic: IQC-QuICS Math and Computer Science Seminar\n\nJoin Z oom Meeting\n\nhttps://umd.zoom.us/j/94516883349?pwd=Qnc4NFdWNzMzVU5NS0dqbW 4vdy93dz09\n\nMeeting ID: 945 1688 3349\n\nPasscode: 233641\n\nOne tap mobi le\n\n+13017158592\,\,94516883349# US (Washington DC)\n\n+19294362866\,\,94 516883349# US (New York)\n\nDial by your location\n\n +1 301 715 859 2 US (Washington DC)\n\n +1 929 436 2866 US (New York)\n\n +1 312 626 6799 US (Chicago)\n\n +1 253 215 8782 US (Tacoma)\n\n +1 346 248 7799 US (Houston)\n\n +1 669 900 6833 US (San Jose)\n\n Meeting ID: 945 1688 3349\n\nFind your local number: https://umd.zoom.us/u/ abyEXZwwR\n\nJoin by SIP\n\n94516883349@zoomcrc.com\n\nJoin by H.323\n\n162 .255.37.11 (US West)\n\n162.255.36.11 (US East)\n\n115.114.131.7 (India Mum bai)\n\n115.114.115.7 (India Hyderabad)\n\n213.19.144.110 (Amsterdam Nether lands)\n\n213.244.140.110 (Germany)\n\n103.122.166.55 (Australia Sydney)\n\ n103.122.167.55 (Australia Melbourne)\n\n149.137.40.110 (Singapore)\n\n64.2 11.144.160 (Brazil)\n\n69.174.57.160 (Canada Toronto)\n\n65.39.152.160 (Can ada Vancouver)\n\n207.226.132.110 (Japan Tokyo)\n\n149.137.24.110 (Japan Os aka)\n\nMeeting ID: 945 1688 3349\n\nPasscode: 233641 LAST-MODIFIED:20210319T202350Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210402T190000Z DTEND:20210402T200000Z DTSTAMP:20260828T094430Z UID:5de77bmfbb1kolhlg8rqlscv40@google.com CREATED:20210331T120532Z DESCRIPTION:
    Dark Matter Search with the LUX-ZEPLIN ex periment

    < /span>
    Speaker: Alvine Kamaha\, Univers ity at Albany\, SUNY


    An astonishing conclusion of modern cosmology is that about 80 % of the Universe matter is in an unknown and yet to be discovered form so- called dark matter. Searching for this missing mass has risen to the forefr ont of particle physics research. Numerous experiments around the world are in the race for its discovery utilizing different detection techniques. Am ong them\, \; the LUZ-ZEPLIN (LZ) experiment\, a liquid Xenon time proj ection chamber\, building on the success of its predecessors to detect heav y dark matter particles with an unprecedented sensitivity. In this talk\, I will first discuss some dark matter evidence\, its particle candidates and detection technologies. Then I will discuss the LZ dark matter search expe riment and the measures taken to reach the targeted sensitivity with an emp hasis on my contributions in this regard. I will end by discussing the sear ch for dark matter beyond LZ and current generation experiments.


    https://umd.zoom.us/j/2288979410
    Meeting ID: 228 897 941 0
    LAST-MODIFIED:20210331T120731Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special seminar: Dark Matter Search TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211005T170000Z DTEND:20211005T181500Z DTSTAMP:20260828T094430Z UID:5s92j7fuqddja0qhnk7siils6r@google.com CREATED:20210913T181349Z DESCRIPTION:Speaker: Chris Mundy\, PNNL

    Title: Top-Down and Bottom-U p Modeling of Aggregation and Assembly in Complex Material Systems

    A bstract: The statistical analysis of molecular dynamics simulations require s dimensionality reduction techniques\, which yield a low-dimensional set o f collective variables x_i = x that in some sense describe the essential dy namics of the system. Considering the distribution P(x) of the collective v ariables\, the primal goal of a statistical analysis is to detect character istic features of P(x)\, in particular\, its maxima and their connection pa ths. This is because these features characterize the low-energy regions and the energy barriers of the corresponding free energy landscape\, and there fore amount to the metastable states and transition regions of the system. In this seminar\, we outline a systematic strategy to identify collective v ariables and metastable states\, which subsequently can be employed to cons truct a Langevin or a Markov state model of the dynamics. In particular\, w e account for the still limited sampling typically achieved by molecular dy namics simulations\, which in practice seriously limits the applicability o f theories (e.g.\, assuming ergodicity) and black-box software tools (e.g.\ , using redundant input coordinates). We show that it is essential to use i nternal (rather than Cartesian) input coordinates\, employ dimensionality r eduction methods that avoid rescaling errors (such as principal component a nalysis)\, and perform density based (rather than k-means-type) clustering. Finally we discuss a machine learning approach to dimensionality reduction \, that highlights the essential internal coordinates of a system and may r eveal hidden reaction mechanisms.

    F. Sittel and G. Stock\, Perspective Ar ticle in J. Chem. Phys 149\, 150901 (2018)

    S.Brandt\, F. Sittel\, M. Ernst\, and G. Stock\, Machine Learning of Biomolecular Reaction Coordinate s\, J. Phys. Chem. Lett. 9\, 2144 (2018) \;


    Where: \;    https://go.umd.edu/statphys_zoom

    1:15pm (An informal pre-seminar chat with the speaker\, to whic h all are invited\, will be held at 1:00pm). LAST-MODIFIED:20210928T135105Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T160000Z DTEND:20211117T171500Z DTSTAMP:20260828T094430Z UID:48vsar1h9d88qpg1tnbe3lik93@google.com CREATED:20210914T155724Z DESCRIPTION:Speaker: Martin Cordiner\, NASA - \;https://science/gsfc.nasa.gove/se d/bio/martin.cordiner

    Title: Revealing the Chemistry of Comets a t Radio/Sub-mm Wavelengths

    Abstract: Comets are astrochemical fossil s of our Solar System\, containing frozen remnants
    from the epoch of pla net formation. As they heat up during brief passages through
    the inner S olar System\, remote and in situ measurements of their sublimated
    atmosp heres (comae)\, reveal the composition of the protosolar accretion disk at< br>the epoch of planet formation\, 4.5 billion years ago. Observations of t he newly
    discovered class of interstellar objects allows us\, for the fi rst time\, to directly
    measure (and test theories for) the chemistry of planet formation around other
    stars in the Galaxy. Thus\, comets bring t o our celestial doorstep a unique and
    powerful opportunity to better und erstand our astrochemical origins\, as well as to
    test our knowledge of low-temperature\, solid-state and gas-phase chemistry. In
    this seminar\, I will review ground-based spectroscopic observations of comets at
    radi o and sub-mm wavelengths\, and present some highlights of my recent
    rese arch in this area\, focusing on the composition of interstellar object 2I/B orisov
    and the chemically peculiar comet R2/PanSTARRS. LAST-MODIFIED:20211109T151127Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211012T170000Z DTEND:20211012T181500Z DTSTAMP:20260828T094430Z UID:1mi2b8jo2o05gimijlg0spbjrs@google.com CREATED:20211005T135321Z DESCRIPTION:Speaker: Johnathan Weare\, New York University - \;https://cims.nyu.edu/~weare/

    Titl e: A Fresh Look at Learning Long-Timescale Phenomena From Trajectory Data
    Abstract: \;Events that occur on very long timescales are often t he most interesting features of complicated dynamical systems. Even when we are able to reach the required timescales with a sufficiently accurate com puter simulation\, the resulting high dimensional data is difficult to mine for useful information about the event of interest. Markov state modeling (MSM) in particular has proven a powerful tool for turning trajectory data into useful understanding of long-timescale processes. Taking a new perspec tive on trajectory data analysis methods I will describe a family of method s that generalize MSMs with the aim of computing predictions of specific lo ng timescale phenomena using only relatively short trajectory data (e.g. mu ch shorter than the return time of the event). This new perspective points in exciting new directions for both rare event analysis algorithms as well mathematical analysis. In particular\, I will explain the remarkable error properties in approximations of specific rare event forecasts achievable us ing a data set of short trajectories alone.

    Below is the ZOOM seminar link.

    ZOOM: \;https:/ /go.umd.edu/statphys_zoom.

    LAST-MODIFIED:20211006T161451Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T160000Z DTEND:20211022T164500Z DTSTAMP:20260828T094430Z UID:3so0u77hf92k156v12ullen7jo@google.com CREATED:20211016T004535Z DESCRIPTION:Speaker: Naren Manjunath (University of Maryland\, Physics)\nT ime: Friday\, October 22\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nThe integer quantum Hall st ates\, the quantum spin Hall insulator\, and the (2+1)D p-wave topological superconductor each have an important place in condensed matter physics due to their quantized symmetry-protected topological invariants. These system s have a unique ground state on any closed manifold in (2+1) dimensions\, a nd are examples of 'invertible' topological phases of fermions. Here I will describe a general theory which fully encodes the universal properties of such invertible phases\, and classifies them based on their symmetries. Thi s approach is 'categorical': it does not require solvable microscopic model s\, and is applicable to systems with arbitrarily strong interactions. Some new applications of the theory include an interacting version of the 'tenf old way' classification of topological insulators and superconductors\, and also the prediction of an interesting invertible phase which by our naïve intuition should not exist (but apparently does). \n\nReference: https://ar xiv.org/abs/2109.11039\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211016T004535Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Naren Manjunath TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210127T203000Z DTEND:20210127T213000Z DTSTAMP:20260828T094430Z UID:431taj7e9kh8s2jjcu91mudbg7@google.com CREATED:20210114T121729Z DESCRIPTION:Title : The onset of reconnection in Earth's magnetotail
    Spe aker Name: Kevin Genestreti
    Speaker Institution : Southwest Research Ins titute

    Abstract : The elongated tail of our nightside magnetosphere stores energy from the solar wind. The oppositely-directed magnetic fields in the northern and southern tail are separated by a current sheet\, which periodically becomes very thin then "short circuits". Understanding the cau ses of magnetic reconnection - the "short circuit" mechanism - is an import ant yet elusive problem in space physics. We have learned a tremendous amou nt about reconnection by observing it while it is occurring in space\, yet it is still debated how reconnection starts in the first place. Ambiguity s tems from the difficulty of determining the accurate time history of a reco nnection event over the vast range of relevant spatial scales. The standard picture is that reconnection of the solar wind and Earth's dayside magneti c fields drives global (~1015 km3) magnetospheric convection\, which can th in the current sheet by compressing it or depleting its internal pressure. However\, tail reconnection does not necessarily follow dayside reconnectio n and some thin current sheets remain stable. Microscopic (~107 km3) magnet ic reconnection sites are formed after one of several proposed instabilitie s is triggered. While several instabilities accompany reconnection\, causal relationships have been difficult to verify.

    We start the seminar b y summarizing the basic concepts of magnetospheric reconnection and the wid e-ranging impacts of reconnection on near-Earth space. We then report a cas e study where many space and ground-based observatories witnessed magnetota il reconnection being initiated. We find that the tail current sheet became thin by evacuating its internal thermal pressure without significant daysi de reconnection. The solar wind prompted the pressure evacuation and\, even tually\, initiated reconnection by momentarily compressing the tail. Reconn ection was initiated in multiple locations once the current sheet surpassed the threshold for the electron-tearing instability\, which requires a suff iciently thin current sheet with a weak magnetic field and a low ion-to-ele ctron temperature ratio. One reconnection site quickly engulfed the others\ , becoming the dominant region that shredded the tail's magnetic field\, fi tting with simple models. \; \;

    Host: Marc Swisdak
    Host E -Mail: \;swisdak@umd.edu LAST-MODIFIED:20210114T121729Z LOCATION:Contact Marc Swisdak (swisdak@umd.edu) for Zoom coordinates. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T200000Z DTEND:20220503T213000Z DTSTAMP:20260828T094430Z UID:328i8kmi116qopntcrikkba0sb@google.com CREATED:20220120T221416Z LAST-MODIFIED:20220429T200628Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210421T200000Z DTEND:20210421T210000Z DTSTAMP:20260828T094430Z UID:50oeaqid7l4m8mra68ti9eimtq@google.com CREATED:20210415T185305Z DESCRIPTION:


    Accelerating machine learning inference in par ticle physics with coprocessors
     \;
    Speaker: Kevin Pedro\ , Fermi National Accelerator Laboratory (FNAL) \;
    Online Via Zoom:&n bsp\; \;https://umd.zoom.us /j/96004266225 \; \;

    New heterogeneous computing paradigms on dedicated hardware with increased parallelization offer exciti ng solutions with large potential gains. The growing applications of machin e learning algorithms in particle physics for simulation\, reconstruction\, and analysis are naturally deployed on such platforms. The acceleration of machine learning inference as a web service represents a heterogeneous com puting solution for particle physics experiments that requires minimal modi fication to the current computing model. Coprocessors deployed as an edge o r cloud service for the particle physics computing model can have a higher duty cycle and are potentially much more cost-effective. Initial results wi th Microsoft Brainwave FPGAs and Nvidia GPUs show more than an order of mag nitude reduction in inference latency and high throughput. The demonstrated performance is suitable to address the computing challenges faced by both energy frontier and intensity frontier experiments\, including the HL-LHC d etectors and DUNE. \; LAST-MODIFIED:20210415T185414Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:HEP/Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201103T160000 DTEND;TZID=America/New_York:20201103T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201103T160000 CREATED:20200116T204737Z DESCRIPTION:Recording Information:

    Meeting Recording:< br>https://umd.zoom.us/rec/share/hDp7HuTCdoRX7n1V6BDp6a6_3j85uTPTJvbCeivXf- 7QkC2IwZvoi8MNYYQOwrY._2essYQLtmLmw-Hq

    Access Passcode: 6?fa0 8e!


    Quantum Chaos and the Foundations of Statistical Mechanic s

    Speaker: Mark Srednicki\, UC Santa Barbara

    Abstract: Th e question of how isolated many-body systems come to thermal equilibrium ha s been debated since before the advent of quantum mechanics\, which seems o nly to confuse the issue further. I will present a simple picture\, develop ed over the last two decades\, of how thermalization of isolated quantum ma ny-body systems can occur\, with the universal properties of chaotic quantu m dynamics as the underlying mechanism. An array of analytic\, numerical\, and experimental evidence now supports the validity of this picture for a l arge class of systems.


    ZOOM link: \;http s://umd.zoom.us/j/95368896289?pwd=d0pqN3FGWjdCSFJlZDdXSmcxNlh LZz09


    Meeting ID: 953 6889 6289 \;& nbsp\;Passcode: 89593 LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211105T160000Z DTEND:20211105T164500Z DTSTAMP:20260828T094430Z UID:6eo6cur0tccr2s9acf9cksfspq@google.com CREATED:20211028T225028Z DESCRIPTION:Title: The Most Coherent Superconducting Qubit?\nSpeaker: Aar on Somoroff (JQI)\nTime: Friday\, November 5\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nTo real ize a digital quantum processor based on superconducting qubits\, gate erro r rates must be further reduced by raising coherence times and increasing a nharmonicity. I report our group's progress in improving coherence and cont rol of fluxonium superconducting qubits by optimizing the circuit's spectru m and enhancing fabrication methods. I demonstrate a device with coherence time T2 exceeding 1 millisecond and an average single-qubit gate fidelity g reater than 99.99% [1]. To our knowledge\, these are the highest coherence times and gate fidelities observed in a solid-state qubit to date. The coh erence time is still limited by dielectric loss and can be improved by furt her mitigating material losses. The high gate fidelity is readily achievabl e due to the strong anharmonicity inherent to fluxonium's spectrum. Finally \, I will present our recent work on scaling up from the single-qubit level to demonstrating two-qubit gates with capacitively coupled fluxonium circu its [2]. \n\nReferences: [1] A. Somoroff et al. arXiv:2103.08578 (2021) [2] Q. Ficheux et al. Phys. Rev. X 11\, 021026 (2021)\n\nPizza and drinks serv ed after the talk. LAST-MODIFIED:20211028T225028Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Aaron Somoroff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220429T170000Z DTEND:20220429T174500Z DTSTAMP:20260828T094430Z UID:02opiheresgnbv9ktrfgs88m6a@google.com CREATED:20220420T164836Z DESCRIPTION:Title: Optical conductivity and orbital magnetization of Floqu et vortex states\nSpeaker: Iman Ahmadabadi (JQI)\nTime: Friday\, April 29 \, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nMotivated by re cent experimental demonstrations of Floquet topological insulators\, there have been several theoretical proposals for using structured light\, either spatial or spectral\, to create other properties such as flat band and vor tex states. In particular\, the generation of vortex states in a massive Di rac fermion insulator irradiated by light carrying nonzero orbital angular momentum (OAM) has been proposed recently. Here\, we evaluate the orbital m agnetization and optical conductivity as physical observables for such a s ystem. We show that the OAM of light induces nonzero orbital magnetization and current density. The orbital magnetization density increases linearly as a function of OAM degree\, and non-linearly as a function of the frequen cy of the light field. In certain regimes\, we find that orbital magnetizat ion density is independent of the system size\, width\, and Rabi frequency of light. Furthermore\, we study the optical conductivity for various types of electron transitions between different states such as vortex\, edge\, a nd bulk that present in the system. Based on conductance frequency peaks\, a scheme for the detection of vortex states is proposed.\n\n(Pizza and refr eshments will be served after the talk.) LAST-MODIFIED:20220420T164836Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Iman Ahmadabadi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T180000Z DTEND:20211130T190000Z DTSTAMP:20260828T094430Z UID:17l8u2m8oeq6105rdbgukr8bio@google.com CREATED:20211123T180000Z DESCRIPTION:Title: Verification with Minimal Overhead\, and Public Verifica tion of Quantum Computation\nSpeaker: Dominik Leichtle (Sorbonne University )\nTime: Tuesday\, November 30\, 2021 - 1:00pm\nLocation: ATL 3100A and Vir tual Via Zoom: https://umd.zoom.us/j/98741240626?pwd=QjhQNkI4WSt5S3Z0Rll2RH pJYjl4UT09 Meeting ID: 987 4124 0626 Passcode: 035986\n\nWith the developme nt of delegated quantum computation\, clients will want to ensure confident iality of their data and algorithms\, and the integrity of their computatio ns. In this talk\, I present recent work on two directions of research rela ted to blind and verified quantum computing.\nWhile protocols for blind and verifiable quantum computation exist\, they suffer from high overheads and from over-sensitivity: When running on noisy devices\, imperfections trigg er the same detection mechanisms as malicious attacks\, resulting in perpet ually aborted computations. We introduce the first blind and verifiable pro tocol for delegating BQP computations to a powerful server with repetitions as the only overhead. It is composable and statistically secure with expon entially low bounds and can tolerate a constant amount of global noise.\nEx isting protocols for verified quantum computing fall short of resolving con flicts between client and server from a third party’s perspective. In case the client rejects the outcome of a delegated computation on the basis of f ailed verification\, a third party will generally not be able to tell wheth er the abort of the protocol has been triggered by deviations by the client or by the server. We propose a new cryptographic protocol that provides th e same security guarantees as other blind verification protocols\, while ad ditionally resolving this conflict.\n\nhttps://umd.zoom.us/j/98741240626?pw d=QjhQNkI4WSt5S3Z0Rll2RHpJYjl4UT09\nMeeting ID: 987 4124 0626\nPasscode: 03 5986\n\nOne tap mobile\n+19294362866\,\,98741240626# US (New York)\n+130171 58592\,\,98741240626# US (Washington DC)\nDial by your location\n +1 929 436 2866 US (New York)\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n Meeting ID: 987 4124 0626\nFind your local number: https://umd.zoom.us/u/ad sUSOKNiq\nJoin by SIP\n98741240626@zoomcrc.com\nJoin by H.323\n162.255.37.1 1 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114 .115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.1 40.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Austra lia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.13 7.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Va ncouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeet ing ID: 987 4124 0626\nPasscode: 035986\nEvents\nSeminars\nUpcoming Seminar s\nPast Seminars\nSpecial Events LAST-MODIFIED:20211123T180000Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/98741240626? pwd=QjhQNkI4WSt5S3Z0Rll2RHpJYjl4UT09 Meeting ID: 987 4124 0626 Passcode: 03 5986 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Dominik Leichtle TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211213T200000Z DTEND:20211213T213000Z DTSTAMP:20260828T094430Z UID:27c8qqqqg1ti0qnce3l80hgm5c@google.com CREATED:20210827T185952Z DESCRIPTION:Speaker: Keith Dienes\, University of Arizona/ NSF


    T itle: "UV/IR Mixing\, EFTs\, and Origami: Calculating the Higgs Mass in Str ing Theory"

    Abstract
    In this talk\, we shall present a non-techni cal method of understanding UV/IR mixing from a field-theoretic perspective . We will then discuss how these ideas are ultimately realized in string th eory\, providing a self-contained introduction to relevant string ideas as we proceed. Finally\, we shall present a fully string-theoretic framework f or calculating one-loop Higgs masses directly from first principles in pert urbative closed string theories. Notably\, using our framework\, we find th at a gravitational modular anomaly generically relates the Higgs mass to th e one-loop cosmological constant\, thereby yielding a string-theoretic conn ection between the two fundamental quantities which are known to suffer fro m hierarchy problems in the absence of spacetime supersymmetry. We also dis cuss a number of crucial issues involving the use and interpretation of reg ulators in UV/IR-mixed theories such as string theory\, and the manner in w hich one can extract an EFT description from such theories. Finally\, we an alyze the running of the Higgs mass within such an EFT description\, and un cover the existence of a ``dual IR'' region which emerges at high energies as the consequence of an intriguing scale-inversion duality symmetry. We al so identify a generic stringy effective potential for the Higgs fields in s uch theories. Our results can therefore serve as the launching point for a rigorous investigation of gauge hierarchy problems in string theory.

    Slides LAST-MODIFIED:20211216T183032Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220801T150000Z DTEND:20220801T163000Z DTSTAMP:20260828T094430Z UID:3rtvuqtco5qvqq5mt71o1ud2de@google.com CREATED:20220726T181006Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Introdu ction to quantum error correction\nSpeaker: Victor Albert (QuICS)\nTime: Monday\, August 1\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zo om: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123\n\nLecture 1: Introduction to qu antum error correction\n\nI provide a brief introduction to the tenets of q uantum error correction using the four-qubit code\, making contact with con catenated\, CSS\, stabilizer\, and rotated surface codes. \n\nJoin Zoom Mee ting\nhttps://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile\n+166990068 33\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\ n\nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8782 US (Tacoma)\n+1 301 715 8592 US (Washington DC )\n+1 312 626 6799 US (Chicago)\n+1 346 248 7799 US (Houston)\n+1 386 347 5 053 US\n+1 564 217 2000 US\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind your local number: https://umd.zoom.us/u/abF3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n\nJoin by H. 323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Nether lands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.1 22.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.1 52.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (J apan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181006Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc1 23 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210414T200000Z DTEND:20210414T210000Z DTSTAMP:20260828T094430Z UID:0b6igs0gm7h3eq6l7penng7scc@google.com CREATED:20210407T193731Z DESCRIPTION:The First Result from the Muon g-2Experiment at Fermilab
    Spe aker: Adam Lyon\, Fermi National Accelerator Laboratory
    Slides can be downloaded here:


    https://gm2-docdb.fnal.gov/cgi-bin/RetrieveFile?docid=25139& amp\;filename=UMD_JHU_Seminar_20210414.pdf&\;version=1
    &nb sp\;
    Twenty years ago\, the anomalous magnetic moment of the muon was me asured at Brookhaven National Laboratory on Long Island\, NY with a precisi on of 0.54 ppm and disagreed\, at that time\, with the Standard Model at ar ound the 3 sigma level. Thus began a long wait for anew result to say more on this hint of possible physics beyond the SM. During this time\, the SM p rediction has improved so that the BNL discrepancy recently stood at 3.7 si gma. About a decade ago\, Fermilab and a new collaboration joined this hist orical effort by converting parts of the old Tevatron anti-proto source int o an intense and clean muon delivery system\, moving the g-2 magnet from Ne w York to Illinois\, building many new systems such as new detectors\,elect ronics\, a laser calibration system\, a set of trackers (to name a few)\, a nd aiming to take twenty times the statistics that BNL saw to reach ~ 100 p pb inprecision: a factor of four better than BNL. The first result\, based on 6% of the Fermilab dataset\, was released on April 7\, 2021 and\, in agr eement with the BNL result\, has an uncertainty of 0.46 ppm and is 3.3 sigm a from the SM prediction. The FNAL-BNL combined result has a total uncertai nty of 0.35 ppm and the discrepancy is now 4.2 sigma\, strengthening this h int of possible new physics. In this seminar\, I will give details of this new result and explain plans for the future.

    Held in conjunction with Johns Hopkins University
    If you would like to watch the video\, please email mknouse@umd.edu for the link. \; LAST-MODIFIED:20210415T205028Z SEQUENCE:3 STATUS:CONFIRMED SUMMARY:HEP/PA/Particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220426T220000Z DTEND:20220427T005000Z DTSTAMP:20260828T094430Z UID:7ta29030bsnqhd71g87f8t92kv@google.com CREATED:20220210T150139Z DESCRIPTION:
    Suvi Gezari presents the fil m Contact as part of the Science and Society via Film course. All ar e welcome. For information and the entire semester's schedule\, see the cou rse website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220328T162951Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contact TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T180000Z DTEND:20220413T190000Z DTSTAMP:20260828T094430Z UID:2ek0cfldp777316535gfrbt93i@google.com CREATED:20220412T140936Z DESCRIPTION:Speaker: \; Chris Laumann (Boston University)

    Where: ATL 4402

    Title: \;Entanglement with Constr aints in Many-Body Systems

    Abstract: Over the last several de cades\, entanglement has emerged as a unifying lens for understanding pheno mena across many areas in quantum physics. At low energy\, the structure of ground state entanglement reflects universal features of the phase of matt er. At high energy\, the growth of entanglement underlies thermalization an d the emergence of statistical mechanics. In this talk\, I will describe tw o recent exact results characterizing entanglement in many-body systems.

    First\, we will consider the entanglement entropy in momentum space of translation-invariant Fermi liquids and superconductors. By developing a n on-perturbative expansion in the k-space volume of the partition\, we will discover a universal function of low energy parameters hiding in the entrop y.

    Second\, we will consider how Hilbert space constraints\, arising from symmetry or local rules\, change the typical entanglement of random p ure states. By an exact diagrammatic approach\, I will compute entanglement spectra. The singularities in these spectra naturally organize constraints and symmetries into "phases". \;

    Host: Dr. Jay Sau LAST-MODIFIED:20220412T141023Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211116T180000Z DTEND:20211116T190000Z DTSTAMP:20260828T094430Z UID:2v8r9kersd5j47q5nnaqe11vbd@google.com CREATED:20210913T184038Z LAST-MODIFIED:20210913T184038Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210325T140000 DTEND;TZID=America/New_York:20210325T153000 DTSTAMP:20260828T094430Z UID:0f9896cjsevjarfbt037tra83r@google.com RECURRENCE-ID;TZID=America/New_York:20210325T140000 CREATED:20210125T162425Z DESCRIPTION:Speaker: David Broun\, Simon Fraser University



    T itle: \;From Mott to not: phenomenology of overdoped cuprates
    Abstra ct:
    Quantum materials exhibit a rich variety of phenomena and ground sta tes when there is a delicate balance between the kinetic and potential ener gies of the electron system. \; \;Cuprate superconductors are a cla ssic example\, with the undoped parent compounds forming an antiferromagnet ic Mott insulator\, which morphs into an unconventional d-wave \;superc onductor when charge carriers are doped into the system. \; \;Furth er doping of charge carriers should produce a state in which the kinetic en ergy dominates – the Landau \;Fermi liquid. \; \;This point of view remains highly controversial\, however\, with the claim that recent ex periments on overdoped cuprates are at odds with conventional physics.  \; \;I will \;review the evidence and show that when disorder and e lectronic structure properly taken into account\, the low energy properties of overdoped cuprates are remarkably well \;described by “dirty d-wave ” theory\, without the need to introduce physics beyond the the Landau–BCS paradigm.


    Host: Anlage
    For the zoom link please email Kristin Stenson at QMC@umd.edu LAST-MODIFIED:20210308T135823Z LOCATION: Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: David Broun\, Simon Fraser University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210329T110000 DTEND;TZID=America/New_York:20210329T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210329T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: A bilayer Hubbard model with ultraco ld atoms.

    Speaker: Michael Köhl

    Abstra ct: Fermionic atoms in optical lattices have served as a useful mo del system in which to study and emulate the physics of strongly correlated matter. Driven by the advances of high-resolution microscopy\, the current research focus is on two-dimensional systems\, in which several quantum ph ases—such as antiferromagnetic Mott insulators for repulsive interactions a nd charge-density waves for attractive interactions—have been observed. How ever\, the lattice structure of real materials\, such as bilayer graphene\, is composed of coupled layers and is therefore not strictly two-dimensiona l\, which must be taken into account in simulations. Here we realize a bila yer Fermi–Hubbard model using ultracold atoms in an optical lattice\, and d emonstrate that the interlayer coupling controls a crossover between a plan ar antiferromagnetically ordered Mott insulator and a band insulator of spi n-singlets along the bonds between the layers. We probe the competition of the magnetic ordering by measuring spin–spin correlations both within and b etween the two-dimensional layers. Our work will enable the exploration of further properties of coupled-layer Hubbard models\, such as theoretically predicted superconducting pairing mechanisms.



    We are host ing the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members an d affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also be live streaming each semi nar on YouTube. Once a seminar starts\, you will find a link to the live st ream on our YouTube page at \;https://www.youtube.com/user/JQInews. LAST-MODIFIED:20210324T002924Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T160000Z DTEND:20211208T171500Z DTSTAMP:20260828T094430Z UID:0j6i2vblrg14dd1h7iohsof0lv@google.com CREATED:20210914T160431Z DESCRIPTION:Speaker: Peng Chen\, Cornell University - \;http://chen.chem.cornell.edu/pengchen .html

    Title: Single-Molecule Catalysis: Nanoparticles and Polyme rs

    Abstract: This presentation will describe our efforts in developi ngand applying single-molecule approaches to study (photo)(electro)catalysi s onnanoparticles and in making polymers. In the first part\, I will give s omebackground on single-molecule\, super-resolution fluorescence imaging of catalytic reactions on single nanoparticle\, with some examples\, as well a s presentour recent work of imaging nonfluorescent surface processes at sup er opticalresolution. In the second part\, I will describe our work inusing magnetic tweezers to track single polymer growth in real time underliving polymerization catalysis conditions.

    Key references:

    1)  \; \; \; \; \;X.Mao\, C. Liu\, M. Hesari\, N. Zou\, P. Chen * "Super-resolu tion imaging ofnonfluorescent reactions via competition" Nature Chem . 2019\, 11\, 687-694.

    2) \; \; \;  \; \;R. Ye\, M. Zhao\, X. Mao\, Z. Wang\, D. A. Garzon\,H. Pu\, Z. Zhao \, P. Chen* "N anoscale cooperativeadsorption for materials control" Nature Commun . 2021\, 12\, 4287.

    3) \; \;&n bsp\; \; \;C. Liu\, K. Kubo\, E. Wang\, K.-S. Han\, F. Yang\, G.Che n\, F. A. Escobedo\,* G. W. Coates\,* P. Chen* "Single polymergrowth dynamics" S cience 2017\, 358\, 352-355.

    4) \;  \; \; \; \;S. Baral\, C. Liu\, U. K. Chakraborty\, K. Kubo \, X.Mao\, G. W. Coates\, P. Chen* "Single-chain polymerizationdynamics and conformational mech anics of conjugated polymers" Chem 2021\, 7\, 2175-2189.

     \;

    LAST-MODIFIED:20211201T165019Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221019T193000Z DTEND:20221019T213000Z DTSTAMP:20260828T094430Z UID:30cdjldnifj652mndg9kspsj0i@google.com CREATED:20220815T130937Z DESCRIPTION:Speaker: Dr. Nathan Youngblood\, Assistant Professor\, Electric al and Computer Engineering\, University of Pittsburgh

    Title: TBA


    Abstract: \;http s://www.engineering.pitt.edu/people/faculty/nathan-youngblood/ LAST-MODIFIED:20220815T130937Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211115T110000 DTEND;TZID=America/New_York:20211115T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211115T110000 CREATED:20210708T004621Z DESCRIPTION: \nSpeaker: Aashish Clerk\n \n Institution: Univ ersity of Chicago\n\nDriven-dissipative quantum systems and hidden time-rev ersal symmetries \n \nQuantum systems subject to both driving and dissipati on often have complex\, non-thermal steady states\, and are at the forefron t of research in many areas of physics\, including quantum information proc essing. For classical systems\, microscopic time-reversal symmetry leads t o open systems satisfying detailed balance\; this symmetry makes it extreme ly easy to find their stationary states. In this talk\, I’ll discuss a new way to think about detailed balance in fully quantum settings based on the existence of a “hidden” time-reversal symmetry. I’ll show how this symmet ry connects to the study of thermofield double states\, and moreover\, has a direct operational utility: it provides a direct way to find exact solut ions of non-trivial states. This symmetry is present in a number of experi mentally-relevant systems. and has clear experimental signatures. I’ll try to give a gentle introduction to these ideas\, with a particular focus on many-body driven-dissipative Bose Hubbard like models (as can be realized d irectly in superconducting circuits and a variety of quantum optical platfo rms). \n\nHost: Alicia Kollar LAST-MODIFIED:20220617T080709Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210405T200000Z DTEND:20210405T210000Z DTSTAMP:20260828T094430Z UID:04vmaqeeiofqhcv4gv8uph6lqf@google.com CREATED:20210119T142029Z DESCRIPTION:Speaker: Tony Gherghetta\, University of Minnesota

    Title : A Holographic View of the QCD Axion

    Abstract: The QCD axion soluti on to the strong CP problem requires that the gravitational violation of th e Peccei-Quinn global symmetry be suppressed to extremely high order. This so-called axion quality problem can be addressed in 5D models which have a dual holographic interpretation. The framework can then be used to explain the Standard Model flavor structure and predict flavor-dependent axion-ferm ion couplings that have implications for the ongoing experimental axion sea rches. The holographic view thus shows how the axion quality problem and fl avor structure of the Standard Model can be simultaneously addressed.
    For zoom link please contact mknouse@umd .edu LAST-MODIFIED:20210402T203930Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T180000Z DTEND:20220428T190000Z DTSTAMP:20260828T094430Z UID:7tn49qitnqk34h2v43968r1gua@google.com CREATED:20220424T150606Z DESCRIPTION:Title: Interactive Proofs for Synthesizing Quantum States and U nitaries\nSpeaker: Gregory Rosenthal (University of Toronto)\nTime: Thursda y\, April 28\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https://uwa terloo.zoom.us/j/92541289425?pwd=bDVWYTZBTXpDSE1XMFloMEtLYXJiUT09\n\nWh ereas quantum complexity theory has traditionally been concerned with probl ems arising from classical complexity theory (such as computing boolean fun ctions)\, it also makes sense to study the complexity of inherently quantum operations such as constructing quantum states or performing unitary trans formations. With this motivation\, we define models of interactive proofs f or synthesizing quantum states and unitaries\, where a polynomial-time quan tum verifier interacts with an untrusted quantum prover\, and a verifier wh o accepts also outputs an approximation of the target state (for the state synthesis problem) or the result of the target unitary applied to the input state (for the unitary synthesis problem)\; furthermore there should exist an "\;honest"\; prover which the verifier accepts with probability 1. Our main result is a "\;state synthesis"\; analogue of the inc lusion 𝖯𝖲𝖯𝖠𝖢𝖤⊆𝖨𝖯: any sequence of states computable by a polynomial -space quantum algorithm (which may run for exponential time) admits an int eractive protocol of the form described above. Leveraging this state synthe sis protocol\, we also give a unitary synthesis protocol for polynomial spa ce-computable unitaries that act nontrivially on only a polynomial-dimensio nal subspace. We obtain analogous results in the setting with multiple enta ngled provers as well. Based on joint work with Henry Yuen.\n\n(In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220424T150606Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/92541289425?pwd=bDV WYTZBTXpDSE1XMFloMEtLYXJiUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Gregory Rosenthal TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T160000Z DTEND:20220511T170000Z DTSTAMP:20260828T094430Z UID:0da73nt0alfhmp46rmhmrivqmr@google.com CREATED:20220207T165325Z LAST-MODIFIED:20220207T165325Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T150000Z DTEND:20220302T161500Z DTSTAMP:20260828T094430Z UID:2mb23gdceeelssmia9gud7gvkm@google.com CREATED:20220225T135512Z DESCRIPTION:Title: Autonomous quantum error correction of a grid st ate qubit
    Speaker: Jonathan Home (ETH Zürich)
    Time: Wednesday\, Mar ch 2\, 2022 - 10:00am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 M eeting ID: 989 367 6372 Passcode: abc123

    Quantum error correction is expected to play an important role in the realization of large-scale quant um computers. At the lowest level\, it takes advantage of embedding qubits in a larger Hilbert space\, giving redundancy which allows measurements whi ch preserve logical information while revealing the presence of errors. Whi le many codes rely on multiple physical systems\, Bosonic codes make use of the higher dimensional Hilbert space of a single harmonic oscillator mode. A powerful Bosonic code is the GKP code proposed in 2001\, which uses non- local "\;grid"\; states to protect information from small displacem ents of an oscillator. I will describe experiments in which we encode\, mea sure and perform quantum error correction on an encoded logical GKP qubit\, using the motion of a trapped ion coupled by laser light to an electronic ancilla qubit. We introduce a measurement approach for the finite-energy GK P code which can realize high fidelity qubit readout\, and use this to cons truct a dissipative map which performs error correction\, achieving an exte nsion of logical coherence across all logical axes of more than three. I wi ll also show how these techniques are related laser cooling\, offering a pa rticularly efficient means of entropy extraction from the oscillator via a single spin. I will present perspectives for exending this work to multiple logical qubits as well as towards break-even.

    (Please note the earl ier start time of 10:00 a.m. for this seminar.)

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    Meeting ID: 989 367 6372
    Passcode : 578842 LAST-MODIFIED:20220225T135512Z LOCATION:https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQ T09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Jonathan Home TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210503T160000 DTEND;TZID=America/New_York:20210503T170000 DTSTAMP:20260828T094430Z UID:6he7qnpm9dt692jcfcufhg48m3@google.com RECURRENCE-ID;TZID=America/New_York:20210503T160000 CREATED:20210423T163414Z DESCRIPTION:Speaker: Paolo Creminelli\, ICTP

    Title: Inflation: pert urbation theory and beyond.

    Abstract. Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are the subject of an intense theoretical and experimental study.
    Deviations from Gaussiani ty are usually calculated using perturbation theory. This method\, however\ , fails for unlikely events on the tail of the probability distribution\, l ike the formation of a primordial black hole. I will explain how one can ex plore these unlikely tails using semiclassical methods.

    For zoom lin k please email: mknouse@umd.edu LAST-MODIFIED:20220617T080557Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210303T160000Z DTEND:20210303T170000Z DTSTAMP:20260828T094430Z UID:7ec7ge3gfo41qkce8h45ii65g7@google.com CREATED:20210224T193157Z LAST-MODIFIED:20210224T193310Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T160000Z DTEND:20220228T170000Z DTSTAMP:20260828T094430Z UID:6rh9161c7ae4julppkaoedhmj1@google.com CREATED:20220121T183431Z DESCRIPTION:Speaker: Alexander Efros\, Naval Research Laboratory

    Title: \;Excitons in Perovskite Nanostructures

    Abstract: The bright emission observed incesium lead halide perovskite nanocrystals (NCs) has recently been explained interms of a bright exciton ground state\ , a claim that would make these materialsthe first known examples in which t he exciton ground state is not an opticallyforbidden dark exciton. This unp recedented claim has been the subject ofintense experimental investigation that has so far failed to detect the darkground-state exciton in CsPbBr3 NCs. \; \;I will discuss the exciton finestructure created by the crystal field and the short-range and long-rangeelectron−hole exchan ge interaction and will \;show that the only  \;Rashba termsprovide an explanation for the observed bright exciton level order in CsPbBr3 NCs. The size dependence of the exciton fine structure calculated for perovskiteNCs shows that the bright−dark level inversion caused by the Rash ba effect issuppressed by the enhanced electron−hole exchange interaction in small NCs. [1]

    Another interestingphenomenon connected with presence of the Rashba spin-orbit terms is creationof helical exciton states in orthorh ombic perovskites\, which are split fromeach other. The splitting can be de scribed as a Zeeman effect in an effectivemagnetic field\, whose direction and magnitude depend on the exciton momentum.The selective excitation of th ese states by helical light gives rise to CD.Using experimentally determine d material parameters\, we calculate significantcircular dichroism of order 30% in orthorhombic perovskites under off-normal\,top illumination. These calculations suggest the effect is observable and CD canbe measured in non- chiral perovskite nanostructures such as layered-2D perovskitesor nanoplate lets. [2] \;

    Large spin-orbit Rashba terms inthe conduction and valence bands leads to the exciton with complex dispersion –Rashba exciton. The Rashba terms  \;in casewhen they have different signs flip the ord er of the bright and dark excitonsat zero exciton momentum. \; They als oaffect the exciton dispersion at momentum not equal to zero and creates th eexciton dispersion minima at momentum not equal to zero. [3] . \; Calc ulations show that the ground excitonstate at k=0 is optically active.  \;However\, the exciton dispersion minima occur at  \;nonzero momentum.  \;

    Finally\, I will discuss thethickness-dependent fine structu re of excitons in perovskite nanoplatelets. Ourtheoretical model introduces the effect of the strong special confinement onthe band-edge Bloch functio ns. The predicted fine structure is very differentfrom that observed in 3D nanocrystals\, and is in good agreement with experimentalobservation. [4]

    [1]  \; \;M. A. Becker\, et al. “Bright triplet exciton s incaesium lead halide perovskites\,” Nature\,553\, 189-193 (2018)

    [2] P. C. Sercel\, Z. V. Vardeny\, Al. L. Efros\, “Circular di chroismin non-chiral metal halide perovskites” Nanoscale 2020\, DOI/10.1039 /D0NR05232A

    [3]M. W. Swift\, J. L. Lyons\, Al. L.  \;Efros\, P. C . Sercel “Rashba exciton in a 2D perovskite quantum dot” \; Nanoscale 2 021\, doi.org/10.1039/D1NR04884H

    [4] M. \;Gramlich\, M. W. Swift\ , C. Lampe\, J. L. Lyons\, M. Döblinger\, Al. L.Efros\, P. C. Sercel\, and A. S. Urban\, “Dark \; and \;Bright \; Excitons \; in \ ;Halide \; Perovskite Nanoplatelets” Adv.Sci. 2021\, 2103013\, DOI:10.1 002/advs.202103013. \; \;


    Host: Kartik Srinivasan     LAST-MODIFIED:20220215T160832Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201208T160000 DTEND;TZID=America/New_York:20201208T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201208T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording: \;



    http s://umd.zoom.us/rec/share/EiT7h7VSMzraz1QP_MLx9tJcp1iC3iXwN_7ezTcpji0t2QfZm 6xu0B6B2DNbLm8V.wMlUhpPg56HIEtsq

    Access Passcode: a5a=9w1x


    Zoom Meeting
    https://umd.zoom.us/j/95206514449?pwd =aWFYWjlVMVdtL3BPUU4vbENKYzVhUT09

    Meeting ID: 952 0651 44 49 \;  \;Passcode: 89593 \;

    Microwave spectros copy of the positronium n = 2 fine structure: a disagreement with QEDD. B. Cassidy \;

    Department of Physics and Astronomy \, University College London\, Gower Street\, London\, WC1E 6BT\, UK.
    Since positronium (Ps) atoms are composed only of leptons they are\, for all practical purposes\, pure QED systems\, unaffected by nuclear struc ture effects. Also\, being composed of a particle-­‐antiparticle pair\, Ps atoms are metastable\, and may decay via self-­‐annihilation a s well as through the usual radiative decay channels seen in reg ular atoms. The energy levels of Ps can be calculated to arbitrary precisio n (in principle)\, and precision spectroscopy of Ps can therefore be used t o perform rigorous tests of (bound-­‐ state) QED theory. Moreover\, since t he theoretical description is limited only by the order of the calcu lations performed\, rather than unknown physical constants or incalculabl e terms\, any observed (and confirmed) disagreement with theory could the refore indicate the existence of some sort of “new physics” such as partic les not currently included in the Standard Model [1].

    In this talk I will describe some new measurements of the Ps n = 2 fine structure\, sp ecifically 2 3S1  2 3PJ (J = 0\,1\,2) transitions [2]. The experiments we re performed by using a Surko-­‐type buffer gas positron trap [3] to produc e a dilute Ps gas with a density on the order of 106 cm-­‐3. A 5 ns pulsed dye laser was used to excite atoms to the 2 3S1 level\, and CW microwave radiation was used to drive transitions to the 2 3PJ l evels\, which decay radiatively to the ground state before annihilation [4 ]. The different annihilation decay rates of the ground and excited (S) sta tes allows the fine structure transitions to be monitored via the time spec trum of the Ps annihilation radiation [2].

    We found that the measure d J = 1 and J = 2 lineshapes exhibited significant asymmetries\, whereas a symmetric lineshape was observed for the J = 0 transition. The observed asy mmetries are not consistent with the most obvious quantum interference phen omena arising from the presence of nearby (off-­‐resonant) transiti ons [5]\, and in the absence of a complete lineshape model we are theref ore unable to determine the fine structure intervals for these transitions. Since the J = 0 lineshape did not exhibit any significant asymmetry it was possible to extract a value for the centre frequency: however\, the obtain ed interval was found to disagree with theory by 2.77 MHz\, which amounts t o 4.5 standard deviations. No mechanism for a line shift of this magnitude has so far been identified.

    [1]Current and future perspectives of po sitronium and muonium spectroscopy as dark sectors probe\, Claudia Frugiuel e\, Jesús Pérez-­‐Ríos\, and Clara Peset\, Phys. Rev. D 100\, 015010 (2019) .

    [2]Precision Microwave Spectroscopy of the Positronium n=2 Fine St ructure\, L. Gurung\, T. J. Babij\, S. D. Hogan\, and D. B. Cassidy\, Phys. Rev. Lett. 125\, 073002 (2020).

    [3]Plasma and trap-­‐based techn iques for science with positrons\, J. R. Danielson\, D. H. E. Dubin \,
    R. G. Greaves\, and C. M. Surko\, Rev. Mod. Phys. 87\, 247 (2015).

    [4]Production of 23S1 positronium atoms by single-­‐photon exci tation in an electric field\, A. M. Alonso\, S. D. Hogan\, and D. B. Cassidy\, Phys. Rev. A 95\, 033408 (2017).

    [5]The Effect of Quantum- ­‐Mechanical Interference on Precise Measurements of the n = 2 Triplet P Fi ne Structure of Helium\, A. Marsman\, M. Horbatsch\, and E. A. Hessels\, Jo urnal of Physical and Chemical Reference Data 44\, 031207 (2015).

    Host: Charles Clark LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220211T183000Z DTEND:20220211T193000Z DTSTAMP:20260828T094430Z UID:0la7e430i2g2cjs1d3js613p25@google.com CREATED:20220124T181642Z DESCRIPTION:

    Speaker: \; Raffaele D'Agnolo\, I PhT\, Saclay

    Seminar will be conducted via zoom.

    Preceded by virtual lunch at 12:30pm.

    Title: Cosmolog ical Selection of the Weak Scale


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    Abstract: I will discuss a new joint solution to the electroweak hi erarchy problem and the strong-CP problem [2106.04591]\, with correlated si gnals in future hadronic EDM experiments and searches for dark matter. In t he second half of the talk\, using the previous mechanism as an example\, I will identify the general features of cosmological selection of the weak s cale. In particular I will introduce the concept of 'weak scale trigger' [2 012.04652] and its phenomenology. Triggers are common to the vast majority of mechanisms that explain the weak scale cosmologically. They give us the opportunity to test this general idea experimentally.     LAST-MODIFIED:20220208T185816Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint UMD/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T150000 DTEND;TZID=America/New_York:20210830T163000 RRULE:FREQ=WEEKLY;UNTIL=20211221T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211025T150000 EXDATE;TZID=America/New_York:20211122T150000 EXDATE;TZID=America/New_York:20211206T150000 EXDATE;TZID=America/New_York:20211004T150000 EXDATE;TZID=America/New_York:20211011T150000 EXDATE;TZID=America/New_York:20210830T150000 EXDATE;TZID=America/New_York:20210906T150000 EXDATE;TZID=America/New_York:20210927T150000 EXDATE;TZID=America/New_York:20211108T150000 EXDATE;TZID=America/New_York:20210920T150000 EXDATE;TZID=America/New_York:20211101T150000 EXDATE;TZID=America/New_York:20211018T150000 EXDATE;TZID=America/New_York:20210913T150000 EXDATE;TZID=America/New_York:20211220T150000 EXDATE;TZID=America/New_York:20211213T150000 EXDATE;TZID=America/New_York:20211115T150000 DTSTAMP:20260828T094430Z UID:585k1d3fbanr7t31kj3oqqkcr9@google.com CREATED:20210908T132458Z DESCRIPTION:Seminar will be conducted via zoom.\n\nSpeaker: Patrick Draper\ , University of Chicago\n\nTitle and Abstract: tk\n\nFor zoom link please e mail mknouse@umd.edu LAST-MODIFIED:20210908T132458Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210903T170000Z DTEND:20210903T180000Z DTSTAMP:20260828T094430Z UID:5m3nlj7f1d693tjl2j84ma2nqf@google.com CREATED:20210831T180126Z DESCRIPTION:Speaker: Mary Dorman\, UMD Assistant Director of Environmental Safety\n\nTitle: Safety in the Workplace\n\nAbstract: "Work safely." A simp le two-word directive. But how do you know that you have accounted for all hazards and risks? In this seminar\, we will present the American Chemical Society's RAMP method. A simple approach to Recognize hazards\, Assess risk \, Minimize risk\, and Prepare for Emergencies. We will focus on hazards an d risks specific to the Department of Materials Science and Engineering Lab s. Providing a successful approach to "work safely." LAST-MODIFIED:20210831T180126Z LOCATION:2108 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220418T150000Z DTEND:20220418T160000Z DTSTAMP:20260828T094430Z UID:0naetl7tl8lq8bcs9q9aamh90m@google.com CREATED:20220410T022724Z DESCRIPTION:Title: Repeated Quantum Error Correction in a Distance-Three S urface Code with Superconducting Circuits\nSpeaker: Andreas Wallraff (ETH Zürich)\nTime: Monday\, April 18\, 2022 - 11:00am\nLocation: ATL 2400\, V irtual Via Zoom: https://umd.zoom.us/j/91508910194?pwd=RXlQU2YyMUhyUUtGSlI5Nn RCbm9xdz09 Meeting ID: 915 0891 0194 Passcode: 617935\, Live stream on YouTube: https://www.youtube.com/user/ JQInews\n\nQuantum computers hold the promise of solving computational problems which are intractable using conventional methods. For fault-tolera nt operation quantum computers must correct errors occurring due to unavoid able decoherence and limited control accuracy. Here\, we demonstrate quantu m error correction using the surface code\, which is known for its exceptio nally high tolerance to errors. Using 17 physical qubits in a superconducti ng circuit we encode quantum information in a distance-three logical qubit building up on recent distance-two error detection experiments [1]. In an e rror correction cycle taking only 1.1 µs\, we demonstrate the preservation of four cardinal states of the logical qubit [2]. Repeatedly executing the cycle\, we measure and decode both bit- and phase-flip error syndromes usin g a minimum-weight perfect-matching algorithm in an error-model-free approa ch and apply corrections in postprocessing. We find a low logical error pro bability of 3 % per cycle when rejecting experimental runs in which leakage is detected. The measured characteristics of our device agree well with a numerical model. Our demonstration of repeated\, fast\, and high-performanc e quantum error correction cycles\, together with recent advances in ion tr aps\, support our understanding that fault-tolerant quantum computation wil l be practically realizable.\n[1] C. Kraglund Andersen et al.\, Nature Phys ics 16\, 875–880 (2020)\n[2] S. Krinner\, N. Lacroix et al.\, arXiv:2112.03 708 (2021)\n\n(Work done in collaboration with Sebastian Krinner\, Nathan L acroix\, Ants Remm\, Agustin Di Paolo\, Elie Genois\, Catherine Leroux\, Ch ristoph Hellings\, Stefania Lazar\, Francois Swiadek\, Johannes Herrmann\, Graham J. Norris\, Christian Kraglund Andersen\, Markus Müller\, Alexandre Blais\, Christopher Eichler\, and Andreas Wallraff)\n\nhttps://umd.zoom.us/j/ 91508910194?pwd=RXlQU2YyMUhyUUtGSlI5NnRCbm9xdz09\n\nMeeting ID: 915 089 1 0194\nPasscode: 617935\nFind your local dial-in number: https://umd.zoom.us/u/adMcss99z\n\nUniversity of Marylan d affiliates may participate using Zoom. If you have trouble joining the Zo om meeting\, please try logging in first via the UMD Zoom portal (umd.zoom.com). For those without access to Zoom\, this semin ar will also be live streamed on YouTube. Once the seminar starts\, you wil l find a link to the live stream on YouTube page at https://www.youtube.com/user/JQInews. LAST-MODIFIED:20220410T022724Z LOCATION:ATL 2400\, Virtual Via Zoom: https://umd.zoom.us/j/91508910194?pwd =RXlQU2YyMUhyUUtGSlI5NnRCbm9xdz09 Meeting ID: 915 0891 0194 Passcode: 61793 5\, Live stream on YouTube: https://www.youtube.com/user/JQInews SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Andreas Wallraff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T213000Z DTEND:20220307T223000Z DTSTAMP:20260828T094430Z UID:2pphde8djnl2ehtdc164cbtkkv@google.com CREATED:20220211T164357Z DESCRIPTION:Title: A Low-cost Radio Telescope Array for Ionospheric Remote Sensing

    Speaker: Joseph Helmboldt\, Remote Sensing Division\, Naval Research Laboratory

    Abstract: The Deployable Low-band Ionosphere and Transient Experiment (DLITE) is a fo ur-element interferometric radio telescope made from mostly commercial off- the-shelf parts to minimize costs and maximize ease of deployment. It opera tes in the High Frequency (HF) and Very High Frequency (VHF) regimes\, nomi nally in a 30--40 MHz band\, but with good sensitivity (sky-noise dominated ) in the 20-80 MHz range. Its configuration is optimized to probe ionospher ic structure using the so-called "A-Team\," exceptionally bright sources of cosmic radio emission. Methods have been developed to track the apparent p ositions and intensities of A-Team sources without the need for beam formin g to enable measurements of VHF scintillations as well as total electron co ntent (TEC) gradients. Time difference of arrival (TDOA) and frequency diff erence of arrival (FDOA) methods have been adapted for all-sky imaging to f acilitate both statistical measurements of scintillation levels and time do main astronomy. This presentation will describe the system design\, analysi s algorithms\, and science that can be conducted using results from prototy pe DLITE systems in Maryland\, New Mexico\, and Florida.

    Notes: Join the meeting at 4:15 for meet and greet.  \;Visit https://bit.ly/2PmJoT6 \; for access LAST-MODIFIED:20220211T164357Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210323T150000Z DTEND:20210323T160000Z DTSTAMP:20260828T094430Z UID:7sh3t12c905tf6t3knfecncaa1@google.com CREATED:20210125T151214Z DESCRIPTION:
    Speaker: Sid Parameswaran \;(Oxford University)< /dd>
    Title: \;Topology and broken symmetry of excitons in two -dimensional materials
    Abstract: \;I will discuss recent theoretical work on exciton physics in two-dimensional materials. First\, I will focus on the neutral particle-hole pair excitations of correlated “o rbital Chern insulators” recently detected in twisted bilayer graphene\, wh ose approximately flat conduction and valence bands have equal and opposite non-zero Chern number. Using a mix of exactly solvable models and microsco pic numerical simulations\, I will argue that these features can combine to endow the exciton bands with nontrivial Berry curvature [1]. I will then a rgue\, more speculatively\, that under certain circumstances this could sta bilize a series of “excitonic” fractional quantum Hall states descending fr om the parent “integer" OCI state [2]. I will then change gears to focus on work motivated by recent experiments on monolayer WTe2. I will describe th e zero-field excitonic insulating phase thought to be present in this syste m\, and clarify the role played by band topology in the competition between distinct broken-symmetry exciton orders [3]. I will also comment on the co ncomitant observation of quantum oscillations coincident with insulating be haviour when the same system is placed in a transverse magnetic field.

    [1] YH Kwan\, Y Hu\, SH Simon\, SP\, arXiv: 2003.11560\, to ap pear in PRL.
    [2] YH Kwan\, Y Hu\, SH Simon\, SP\, arXiv: 2003.11559.
    [3] YH Kwan\, T Devakul\, S Sondhi\, SP\, arxiv:2012.5255 (also 2101.05294) .

    Host Yang-Zhi Chou
    Email rcawthor@umd.edu for Zoom details
    LAST-MODIFIED:20210317T152554Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T183000Z DTEND:20220427T193000Z DTSTAMP:20260828T094430Z UID:5oevucqa0j4p8gl45660sj7dcc@google.com CREATED:20220427T155644Z DESCRIPTION:Speaker: Stefano Antonini\, UMD

    Title: Slicing duality and holographic cosmology

    Abstract: I will outline a re cent proposal (https://arxiv.org /abs/2203.11220) for a holographic description of cosmological s pacetimes with negative cosmological constant in AdS/CFT correspondence. Th e microscopic Euclidean theory has a double reflection symmetry and involve s two 3D holographic CFTs coupled by non-holographic auxiliary 4D degrees o f freedom on a strip. The bulk dual Euclidean path integral is dominated by a 4D Euclidean wormhole with two asymptotic AdS boundaries coupled by the non-gravitational auxiliary theory. Two different slicings of the microscop ic Euclidean path integral are possible. This corresponds to two slicings o f the Euclidean wormhole\, defining two different Lorentzian spacetimes rel ated by double analytic continuation. The first one is a Big Bang - Big Cru nch FLRW cosmological universe\; the second one is an AdS eternal traversab le wormhole. I will describe the relationship between cosmological observab les and observables in the traversable wormhole geometry. This "slicing dua lity" allows one to probe the cosmological universe using the usual AdS/CFT dictionary even though the cosmology has no asymptotic boundary. Finally\, I will comment on the possibility of having phases of accelerated cosmolog ical expansion driven by time-varying scalar fields.     LAST-MODIFIED:20220427T155644Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220901T150000Z DTEND:20220901T160000Z DTSTAMP:20260828T094430Z UID:01mm9n47i5vadkhb27bjvl0sit@google.com CREATED:20220804T135731Z DESCRIPTION:Speaker: Dr. Ngong Kodi Beyeh\, Oakland University
    Title: Cavity-containing Macrocycles as Components of Sensory Biohybr id Materials


    Abstr act: TBA LAST-MODIFIED:20220815T135425Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210907T160000 DTEND;TZID=America/New_York:20210907T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210907T160000 CREATED:20200116T204737Z DESCRIPTION:Manuel Franco Sevilla\, University of Maryland

    Title:&nb sp\;New physics in B decays? Challenges to Lepton Flavor Universality from LHCb and the B factories

    Abstract: Since the establish ment of the \;Standard Model (SM) \;many decades ago\, the three ty pes of charged leptons (electron\, muon\, and tau) have been seen as doppel gängers of each other in everything but their readings on the scale. That i s\, the SM interactions of the three lepton families with other \;parti cles \;differ only because of their different masses. This resulting (a ccidental) symmetry is known as Lepton Flavor Universality (LFU). Since 201 2\, however\, a series of measurements of decays \;involving \;tree -level \;b \;→ \;cτν \;and loop-level \;b \; → \;sℓℓ \;transitions (the so-called "B anomalies") have repeatedly hinted at the possibility that lepton \;universality may be\, in fact\ , violated. This pattern was reinforced in March 2021 when LHCb \;repor ted the first \;deviation from the SM \;by more than 3σ \;in a single LFU observable\, one which is affected by negligible theoretical unc ertainties. In this talk I will go over \;the current status of LFU mea surements as well as their compatibility with exotic leptoquarks\, and will briefly review the prospects for the upcoming \;LHCb and Belle II data sets to resolve the anomalies one way or another.
     \;
    Refreshm ents will be offered at 3:30 p.m. in the small plaza outside the lecture ro om doors (facing Regents Drive and the Plant Sciences Bldg.) LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building - Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220804T150000Z DTEND:20220804T163000Z DTSTAMP:20260828T094430Z UID:08aj6jfnvuvn03stjnkmlacc2r@google.com CREATED:20220726T181806Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Bosonic Fock-state codes\nSpeaker: Victor Albert (QuICS)\nTime: Thursday\, Augus t 4\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.z oom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 98 9 367 6372 Passcode: abc123\n\nLecture 3: Bosonic Fock-state codes\n\nI ov erview six use cases of bosonic encodings\, three of which circumvent no-go theorems due to the infinite-dimensionality of bosonic Hilbert space.\n\nJ oin Zoom Meeting\nhttps://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjk zTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile \n+16699006833\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\n\nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8782 US (Tacoma)\n+1 301 715 8592 US (W ashington DC)\n+1 312 626 6799 US (Chicago)\n+1 346 248 7799 US (Houston)\n +1 386 347 5053 US\n+1 564 217 2000 US\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind your local number: https://umd.zoom.us/u/abF3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n \nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114. 131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amst erdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sy dney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64 .211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toron to)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.1 37.24.110 (Japan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181806Z LOCATION: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllv QT09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201013T160000 DTEND;TZID=America/New_York:20201013T173000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201013T160000 CREATED:20200116T204737Z DESCRIPTION:
    UMD users should be sure to \; log into Zoom with their UMD account. \;Guests without an @umd acco unt are welcome to participate\, but will be diverted to a waiting room and admitted by a host.

    Jesse Thaler\, MIT

    Hosted by: Ans on Hook

    Zoom Link: https://umd.zoom.us/j/98938098670?pwd=TWdSZ 0kwNlFyU2lWR2Fya251d0EyZz09

    Meeting Id: 989 3809 8670 \; Pas scode: 89593

    Collision Course: Particle Physics meets Machine Lea rning

    Modern machine learning has had an outsized impact on many scientific fields\, and particle physics is no exception. \; What is s pecial about particle physics\, though\, is the vast amount of theoretical and experimental knowledge that we already have about many problems in the field. \; In this colloquium\, I present two cases studies involving qu antum chromodynamics (QCD) at the Large Hadron Collider (LHC)\, highlightin g the fascinating interplay between theoretical principles and machine lear ning strategies. \; First\, by cataloging the space of all possible QCD measurements\, we (re)discovered technology relevant for self-driving cars . Second\, by quantifying the similarity between two LHC collisions\, we un locked a class of nonparametric machine learning techniques based on optima l transport. In addition to providing new quantitative insights into QCD\, these techniques enable new ways to visualize data from the LHC.

    MEETING RECORDING


    https://umd.zoom.us/rec/share/clp5iCCm4QVBB25M4hNaU505T72f9A82pqkHOmHSdjnfQJ0cBhK3bJaaeOtpx-yy .cBtja9SPD2Ok0sMv

    Access Passcode: q=cY394# \; \; LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210215T160000 DTEND;TZID=America/New_York:20210215T170000 DTSTAMP:20260828T094430Z UID:303hccg6b1atvum48cq5pd58hn@google.com RECURRENCE-ID;TZID=America/New_York:20210215T160000 CREATED:20210111T154105Z DESCRIPTION:Speaker: Bogdan Dobrescu\, Fermilab

    Title: "General Solu tions to Gauge Anomaly Equations"

    Abstract: \;
    A long-standin g problem in particle physics is how to identify anomaly-free sets of chira l \;
    fermions charged under one or more U(1) gauge symmetries. I wil l present the general \;
    solution to the anomaly equations for any n umber of fermions charged under a single U(1).
    Then I will discuss the g eneral solution for six fermions charged under a U(1)XU(1) gauge group\,&nb sp\;
    and give an example of a dark matter model based on that solution. Finally\, in U(1) extensions \;
    of the Standard Model\, I will deriv e the general set of charges for three right-handed neutrinos.

    For z oom link please email mknouse@umd.edu LAST-MODIFIED:20210212T193521Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210423T180000Z DTEND:20210423T190000Z DTSTAMP:20260828T094430Z UID:103rbq6gso2tgkie9m99i61joh@google.com CREATED:20210204T200436Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Philipp Hauke\, University of Trento

    Title: Quantum s imulating lattice gauge theories – high-energy physics at ultra-cold temper atures \;
     \;
    Abstract: Gauge theories are at the heart of ou r modern understanding of physics\, but solving their out-of-equilibrium dy namics is extremely challenging for classical computers. This difficulty is currently spurring a worldwide effort to solve gauge theories on dedicated quantum computing devices. In this talk\, I will discuss recent progress t owards quantum simulation of gauge theories\, especially focusing on ultrac old atoms. I will present a recent breakthrough experiment that has realize d a many-body gauge theory in a 71-site Hubbard model and has certified the fulfilment of Gauss’s law for the first time. Moreover\, I will discuss ou r ongoing theoretical effort to quantify and mitigate the influence of micr oscopic violations of the local gauge symmetry. Through these discussions\, I will aim at outlining a roadmap towards mature and practically relevant quantum simulation of gauge theories. LAST-MODIFIED:20210420T124636Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210219T190000Z DTEND:20210219T200000Z DTSTAMP:20260828T094430Z UID:67rhk5fc74smb28603vqdru9m2@google.com CREATED:20210205T232346Z DESCRIPTION:Seminar will be conducted via zoom:https://umd.zoom.us/j/ 96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Dimitri Kharzeev\, SUNY

    Title: Mass radius of the pro ton

    Abstract: The mass radius is a fundamental property of the proto n that so far has not been determined from experiment. Basing on my recent paper arXiv:2102:00110\, I will show that the mass radius of the proton can be rigorously defined through the formfactor of the trace of the energy-mo mentum tensor (EMT) of QCD in the weak gravitational field approximation\, as appropriate for this problem. I will then demonstrate that the scale ano maly of QCD enables the extraction of the formfactor of the trace of the EM T from the data on threshold photoproduction of J/ψ and Υ quarkonia\, and u se the recent GlueX Collaboration data to extract the r.m.s. mass radius of the proton R_m = 0.55 ± 0.03 fm. The extracted mass radius is significantl y smaller than the r.m.s. charge radius of the proton R_C = 0.8409 ± 0.0004 fm. I will discuss the possible origin of this difference\, and outline fu ture measurements needed to determine the mass radius more precisely. LAST-MODIFIED:20210212T193254Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220310T190000Z DTEND:20220310T203000Z DTSTAMP:20260828T094430Z UID:3avdf2j2kukrh433n8pdhmm91u@google.com CREATED:20220222T163549Z DESCRIPTION:Title: Carbon-based clathrates as a new class of diamond-like framework materials.

    Abstract: \;Clathrates are polyhedral cage-based structures found throughout nature in tetrahedral sy stems \;such as water\, silica\, silicon and germanium. But despite pre dictions spanning >\;50 years\, carbon-based clathrates have remained elu sive. If made\, carbon clathrates would represent diamond-like materials wi th high hardness and strength\, but also offer the possibility for highly t unable electronic structures via guest atom doping within cages. Recently w e have predicted and synthesized the first carbon-based clathrates using a chemical stabilization strategy of boron substitution combined with high-pr essure techniques. We synthesized several unique clathrates based on the bi partite sodalite structure with compositions 1M3B3C (where M = di or trival ent metal). These structures are highly incompressible due to the covalent nature of sp3-hybridized \;B-C bonding\, and the electronic structure i s tunable from semiconductor to metal depending on the valence of the guest atoms. \; For the case of SrB3C3\, in situ electrical transport measur ements\, facilitated by a novel experimental design compatible with extreme synthesis conditions (i.e.\, >\;3000 K at 50 GPa)\, show non-hysteretic resistivity drops that track the calculated magnitude and pressure dependen ce of Tc calculated using the Allen-Dynes modified McMillan equation with C oulomb pseudopotential values (mu*) near 0.15. \; The superconducting n ature of the transition (Tc ≈ 20 K) was confirmed via electrical transport measurements collected under applied magnetic fields up to 18 T. Carbon-bor on clathrates thus represent a new class of superconductors that are simila r to covalent metals like MgB2 and doped fullerenes. Carbon clathrates shar e structures similar with superconducting superhydrides\, but covalent C–B bonds allow metastable persistence at ambient conditions. Different guest a tom substitution schemes in various carbon clathrate structure types may en able conventional superconductivity with Tc approaching 100 K. \; \ ;

    Host: Paglione
     \;

    Seminar <\;In Per son>\;
    Location: 1201 John S. Toll Physics Bldg
    Time: 2:00pm - 3:30pm
    Broadcast Zoom Link: \;  \;https://umd.zoom.us/j /91301075848
     LAST-MODIFIED:20220303T144656Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Timothy Strobel\, Carnegie Institute for Science TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211110T160000Z DTEND:20211110T171500Z DTSTAMP:20260828T094430Z UID:4c4mcnme60cqmf885u5kb1vcs1@google.com CREATED:20210914T155520Z DESCRIPTION:Speaker: Sara Mason\, University of Iowa - \;https://masongroup.lab.uiowa.edu/

    Title: Metal Release from Complex Oxides Studied through Compositional Tuni ng\, Theory\, and Experiment

    Abstract: \;Nanoscale complex metal oxides have transformed how technology is used worldwide. The most widespr ead examples are the electroactive components of Li-ion batteries found in portable electronic devices. As the number of portable devices is projected to increase\, so too will the inadvertent release of complex metal oxide n anomaterials into the environment. This is a pressing problem because the e nvironmental and biological impact of complex metal oxide nanomaterials are most times unknown\, since they are subject to transform rapidly with chan ges in pH and concentration. This brings us to a looming problem that needs to be solved on a global scale. There is a fundamental knowledge gap in de veloping sustainable nanotechnology because there is not yet a systematic m ethod to predict how the properties of a complex metal oxide will change wi th changes in chemical environment. We have developed an approach which com bines DFT-computed total energies and tabulated data to compute the energy cation release of complex metal oxides. We focus on the materials found in a Li-ion battery cathode\, namely LiCoO2 \;(LCO) and composi tionally tuned variants that go on to include nickel and manganese. We find that adjusting surface terminations\, compositions and pH will change the dissolution properties of this family of materials\, and ultimately lead to increased favorability of metal release. We generate a new set of material s where we have replaced Ni\, Co\, and Mn with metals that will keep the sa me functionality while reducing biological impact. We then predict the ther modynamics of metal release to give insight on tailorable properties that c an be used to formulate sustainable design principles for future generation s of functional complex metal oxide materials.

    Zoom link: \;http://go.umd.edu/pchem_semin ars LAST-MODIFIED:20211103T145847Z LOCATION:In person\, IPST Bldg. #085\, 1116 Conference Room and Zoom link b elow. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T150000Z DTEND:20220401T160000Z DTSTAMP:20260828T094430Z UID:0ehi26kr0brncsba9kbrvctg33@google.com CREATED:20220325T025800Z DESCRIPTION:Title: Hardware-centric Quantum Algorithm Design\nSpeaker: Mur phy Niu (Google Quantum AI)\nTime: Friday\, April 1\, 2022 - 11:00am\nLocat ion: IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFR ySUJZSytQcjFVVis0dFpuWU1TZz09\n\nOver the last half-century\, theoretic ians have outlined a quantum path to provably secure communication\, unprec edented sensor sensitivities\, and a quantum advantage to solving problems that are classically hard. However\, cutting-edge research in quantum algor ithms is often detached from exciting progress in quantum hardware engineer ing. This has created a gap between algorithmic requirements and hardware c apabilities. To close this gap\, a deep understanding of quantum hardware p hysics should be integrated into our development of quantum algorithms–what we call hardware-centric algorithm designs. I will review some examples of hardware-centric quantum algorithm design for quantum control\, metrology\ , and error correction. In each case\, the physical details of quantum hard ware can be harnessed in the algorithm design to achieve what is otherwise infeasible:\n\nDemonstrating and verifying quantum advantages in random cir cuits\,\n\nSolving quantum chemistry problems\,\n\nTraining quantum neural networks for classification with experimental noisy intermediate-scale quan tum computers.\n\nLastly\, I will outline the philosophy and software infra structure to assist the co-development of quantum hardware and quantum appl ications to move the field forward. LAST-MODIFIED:20220325T025800Z LOCATION:IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?p wd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Murphy Niu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220906T150000Z DTEND:20220906T160000Z DTSTAMP:20260828T094430Z UID:12sl40qqihjfk4jfaoni1c8lig@google.com CREATED:20220815T163827Z DESCRIPTION:Speaker: Dr. Ester Braselmann\, Georgetown Universit y

    Title: Multiplexed RNA Visualization in Live Mammalian Cells by Fl uorescence Lifetime Imaging Microscopy     LAST-MODIFIED:20220815T163915Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220421T180000Z DTEND:20220421T190000Z DTSTAMP:20260828T094430Z UID:25jk8hqm16vpkr33716p8kdsm3@google.com CREATED:20220413T160759Z DESCRIPTION:Title: Universal efficient compilation: Solovay-Kitaev without inverses\nSpeaker: Tudor Giurgica-Tiron (Stanford University)\nTime: Thu rsday\, April 21\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https:// uwaterloo.zoom.us/j/93303967968?pwd=bm9VWjkwRGZTUjVOTkptekhleHdsZz09\n\ nThe Solovay-Kitaev algorithm is a fundamental result in quantum computatio n. It gives an algorithm for efficiently compiling arbitrary unitaries usin g universal gate sets: any unitary can be approximated by short gates seque nces\, whose length scales merely poly-logarithmically with accuracy. As a consequence\, the choice of gate set is typically unimportant in quantum co mputing. However\, the Solovay-Kitaev algorithm requires the gate set to be inverse-closed. It has been a longstanding open question if efficient algo rithmic compilation is possible without this condition. In this work\, we p rovide the first inverse-free Solovay-Kitaev algorithm\, which makes no ass umption on the structure within a gate set beyond universality\, answering this problem in the affirmative\, and providing an efficient compilation al gorithm in the absence of inverses for both the special unitary\, and the s pecial linear groups in arbitrary dimension. The algorithm works by showing that approximate gate implementations of the generalized Pauli group can s elf-correct their errors. Arxiv: 2112.02040. LAST-MODIFIED:20220413T160759Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/93303967968?pwd=bm9V WjkwRGZTUjVOTkptekhleHdsZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Tudor Giurgica-Tiron TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220912T150000Z DTEND:20220912T160000Z DTSTAMP:20260828T094430Z UID:578391g5ojjbobp4h77hvulodc@google.com CREATED:20220823T174119Z DESCRIPTION:11:00 - 11:30 AM


    Speaker: Emine Altunt as\, JQI
    Title: \;Observation of Stochastic Wavefunction Evolution f rom Dispersively Measured Bose-Einstein Condensates
    Abstract: \;A fu ndamental tenet of quantum mechanics is that measurements change a system's wavefunction to that most consistent with the measurement outcome\, even i f no observer is present. Weak measurements---termed partial or non-destruc tive in different settings---produce only limited information about the sys tem\, and as a result only minimally change the system's state. Ultracold a toms - our workhorse for quantum simulation\, are an ideal platform for dev eloping back-action limited measurements and understanding system-reservoir dynamics of large-scale many-body systems. We theoretically and experiment ally characterize quantum back-action in atomic Bose-Einstein condensates ( BECs) ---the system---weakly measured  \;with a far-from resonant\, i.e .\, dispersivly interacting\, probe laser beam---the reservoir. We theoreti cally describe this process using a quantum trajectories approach and prese nt a measurement model based on an ideal photodetection mechanism. We exper imentally quantify the resulting wavefunction change with three observation s: the change in total atom number\, the contrast of a Ramsey interferomete r\, and the deposited energy. The observed back-action is in good agreement with our measurement model\, demonstrating the capability of true quantum back-action limited measurements of BECs.


    11:30 AM - 1 2:00 PM


    Speaker: \;Hossein Dehghani\, JQI
    Titl e: \;Neural-Network Decoders for Measurement Induced Phase Transitions< br>Abstract: Open quantum systems have been shown to host a plethora of exo tic dynamical phases.
    Measurement-induced entanglement phase transitions in monitored quantum systems are a striking example of this phenomena. How ever\, naive realizations of such phase transitions require an exponential number of repetitions of the experiment which is practically unfeasible on large systems. Recently\, it has been proposed that these phase transitions can be probed locally via entangling reference qubits and studying their p urification dynamics. In this work\, we leverage modern machine learning to ols to devise a neural network decoder to determine the state of the refere nce qubits conditioned on the measurement outcomes. We show that the entang lement phase transition manifests itself as a stark change in the learnabil ity of the decoder function. We study the complexity and scalability of thi s approach and discuss how it can be utilized to detect entanglement phase transitions in generic experiments. LAST-MODIFIED:20220823T174119Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Emine Altuntas and Hossein Dehghani TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T203000Z DTEND:20211208T220000Z DTSTAMP:20260828T094430Z UID:0i6g7b6jgv45i2pdfvkul3sjbt@google.com CREATED:20211130T222957Z DESCRIPTION:
    Abstract:
    Nonlinear superconducting traveling wave devic es are a promising platform for broadband manipulation of single photon lev el microwave signals. For example\, Josephson traveling wave parametric amp lifiers (JTWPAs) are widely used for qubit readout in the cQED community\; however\, despite multiple independent implementations\, their quantum effi ciency remains ~20% below that of an ideal two-mode parametric amplifier. T his raises the question: does broadband amplification come at the cost of r educed quantum efficiency? I discuss\, and describe experimental progress t owards realizing\, our finding that although standard JTWPAs face this trad e-off\, it can be circumvented in a new type of amplifier we call a "Floque t mode amplifier"\, which can achieve near ideal quantum efficiency over a large instantaneous bandwidth. Next I will summarize our proposed traveling wave scheme for broadband microwave isolation using parametric mode conver sion in conjunction with adiabatic phase matching in a pair of coupled nonl inear transmission lines\, for which numerical simulations show more than 2 0 dB isolation over an octave band (4-8 GHz) in a 2000 unit cell device.

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    LAST-MODIFIED:20211130T222957Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=m28143635cb92b5e06 c99f06274680f73 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: Approaching the quantum limits for amplification and i solation with nonlinear metamaterials\, Prof. Kevin O'Brien\, MIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220909T190000Z DTEND:20220909T200000Z DTSTAMP:20260828T094430Z UID:5e03pjgmmrkmf2fl8ooorqd127@google.com CREATED:20220831T154713Z DESCRIPTION:Title:  On the Foundation of End-to-End Quantum Applications
    Speaker:  Xiaodi Wu (QuICS)
    Time:  Friday\, September 9\, 2022 - 3:00pm
    Location:  IRB 0318 and Virtual Via Zoom: https://umd.zoom.us/j/970123028 37?pwd=aHZldjgySnF1S29vcTRuZ3pZaUFjUT09

    It is an exciting time f or quantum computing where prototypes of early-stage quantum computers are becoming available at your fingertips through clouds.  Conventional compute r science study of quantum computing has been focusing on its algorithm and complexity perspective. While providing insights into the power and limits of quantum computing in the asymptotic regime\, this kind of theoretical s tudy is insufficient to capture the opportunities and restrictions of reali stic quantum machines or to address the challenges in building efficient an d reliable systems that operate them.  To fill in this gap\, my group has b een contributing to the foundation of end-to-end quantum applications by in tegrating ideas from theory\, machine learning\, programming languages\, an d systems.  In particular\, I will talk about how quantum computing could h elp optimization and machine learning tasks\, and how we help programmers w rite more efficient and reliable quantum software. I will also mention my r ecent efforts in the design of applications and toolchains for analog quant um machines\, which are more realistic and powerful types of quantum device s in the near future. LAST-MODIFIED:20220831T154713Z LOCATION:IRB 0318 and Virtual Via Zoom: https://umd.zoom.us/j/97012302837?p wd=aHZldjgySnF1S29vcTRuZ3pZaUFjUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Xiaodi Wu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210226T190000Z DTEND:20210226T203000Z DTSTAMP:20260828T094430Z UID:7s02bq1q50sgha6voton5p7ls1@google.com CREATED:20210125T173031Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Fabian Rennecke\, BNL

    Title: The effects of higher to pological charge in QCD

    Abstract: Topological gauge field configurat ions play an important role in the phenomenology of QCD. The axial anomaly is \;inextricably linked to topological effects. They give rise to anom alous meson masses\, affect the order of the chiral phase \;transition\ , and lead to the chiral magnetic effect. On the flip \;side\, topologi cal gauge field configurations can also give rise to strong CP violation. A potential resolution of this \;strong CP problem involves a new partic le\, the axion. Incidentally\, axions are also viable dark matter candidate s and their \;properties are largely determined by the distribution of topological charge in QCD. At high energies in the deconfined \;regime\ , the topological structure of QCD is well described by a dilute gas of ins tantons. In this regime all the effects \;mentioned above are typically studied based on instantons of unit topological charge. In this talk\, I w ill show that there are \;also effects uniquely related to instantons o f higher topological charge. On the one hand\, they give rise to higher-ord er \;anomalous quark correlations which manifest themselves in anomalou s hadronic interactions. On the other hand\, they \;modify the distribu tion of topological charge. This\, in turn\, affects the properties of axio ns and can lead to a topological \;mechanism to increase the amount of axion dark matter. LAST-MODIFIED:20210222T142000Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210510T200000Z DTEND:20210510T210000Z DTSTAMP:20260828T094430Z UID:5bnd8s0k4tkbgfoo7qemu16ft0@google.com CREATED:20210111T171317Z DESCRIPTION:

    Title: Sweet Tension: The Unexpected Role of Cell Gly cocalyx in Mechanobiology

    Speaker: \;Jennifer Curtis\, Georgia Institute of Technology

    Hosted by: \;Arpita Up adhyaya

    Abstract: \;

    Recent studies of cell adhesion identify the cell glycocalyx as a significant but underappre ciated element in the regulation of adhesive bonds. This polymer brush-like structure on the surface of cells\, the glycocalyx is comprised of large p olysaccharides whose bulky presence both sterically and mechanically interf eres with the formation and maintenance of adhesive molecular bonds. Hyalur onan-rich glycocalyx is of particular interest because of its large size as well as its strong correlation with physiological events that involve dyna mic mediation of cell adhesion\, whether embryogenesis\, wound healing or p athological processes like cancer metastasis. In this talk\, we will explor e how a biomimetic glycocalyx comprised of a tunable\, hyaluronan synthase- generated polymer brush provides direct experimental evidence that hyaluron an glycocalyx expressed in tight spaces such as the cell-substratum\, can e xert forces large enough to significantly stress or even break adhesive bon ds and deform the cell. \; \; The work also establishes that cells can navigate through and compress a microns-thick glycocalyx to establish a dhesive bonds. Theoretical estimates of the forces exerted by the compresse d hyaluronan polymer brush provide estimates of the tension imposed on inte grin-fibronectin bonds to be in the range of 0.1-50 pN\, the ideal range to impact cell mechanosensing. \; This work is instrumental in establishi ng a more complete understanding of the mechanical interactions between rec eptor-ligand bonds and hyaluronan-rich glycocalyx. \;


    Zoom Li nk:
    Time: \;May 10\, \;2021 \;@ 4:00PM Eastern Time (US and Canada) \;  \;
    Join Zoom Meeting
    h ttps://umd.zoom.us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1T QnEvUT09
    Meeting ID: 926 8220 2606
    Passcode: 741889

    LAST-MODIFIED:20210420T164315Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211101T110000 DTEND;TZID=America/New_York:20211101T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211101T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Thomas Purdy\, University of Pittsburgh

    Title:& nbsp\;Sensing with optical and acoustic waves

    Abstract : \;

    In this seminar\, I will discuss several recent and ongoing e xperimental efforts in the Purdy Lab (which specializes in quantum sensors and transducers with optical\, mechanical\, and microwave systems)\, with a focus on some often overlooked or least under-appreciated aspects of relat ively simple measurements. \; We have recently completed the first deta iled study of acoustic blackbody radiation interacting with a nanomechanica l system. \; While the acoustic equivalent of the well-known electromag netic blackbody radiation should be equally ubiquitous\, there have been al most no experimental investigations. \; You might look at something and say: “That is glowing red\, it must be hot”\, but you don’t typically turn your head\, cup your ear\, and getting close (but not so close as to burn yourself) mention “Wow\, that is so loud\, it must be really hot”. \; W e have constructed and studied an optomechanical resonator\, whose dominant source of mechanical dissipation is the exchange of energy with a remote “ acoustic blackbody” (i. e. a mechanically lossy bit of material deposited o n the substrate\, that efficiently absorbs and emits thermal acoustic radia tion) via acoustic waves travelling through an acoustically transparent sub strate. \; Ultimately\, the concept of optomechanically detected acoust ic blackbody radiation will be incorporated with our previous experimental efforts in quantum-noise-calibrated optomechanical\, Brownian-motion thermo metry to create a chip-scale primary thermometer that can sense the tempera ture of a macroscopic volume via a nano-opto-mechanical transducer.

    A nother ongoing effort is to understand and eventually surpass the quantum l imits of optical lever detection of a nanobeam. \; The optical lever\, where the angular deviation reflected light is used to measure the tilt of a surface\, is arguably one of the oldest precision optical measurement tec hniques. \; It is still in common use today in atomic force microscopy\ , industrial sensing applications\, and precision metrology because of its simplicity\, robustness\, and excellent sensitivity. \; However\, there has been very little work to understand the fundamental quantum limits of this measurement technique. \; Due to recent advances in ultralow dissi pation nanomechanical systems\, it has now become experimentally relevant t o consider and overcome such limits. \; A Heisenberg measurement—distur bance uncertainty relation is enforced by the optical torque noise from pho tons recoiling off a surface into different spatial modes. \; By a simp le rearrangement of the lenses in our optical lever detection system\, we f ind that the effects of optical backaction can be evaded by exploiting opto mechanically induced optical correlations. \; We have demonstrated this effect to cancel classical laser noise and are working to upgrade our syst em to perform optical lever detection below the standard quantum limit.&nbs p\; Time permitting\, I will also briefly discuss other ongoing efforts in the lab to transduce quantum signals between the mechanical\, optical\, and microwave domains for applications in quantum information.



    Host: Kartik Srinivasan LAST-MODIFIED:20220617T080546Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210412T140000Z DTEND:20210412T220000Z DTSTAMP:20260828T094430Z UID:0g6j4r14cn9p2g311sjgg4u9j8@google.com CREATED:20210326T164723Z DESCRIPTION:First in the Janet Das Sarma Conference Series \;


    Searching for Topological Majorana Zero M odes

    10:00 AM - 10:55 AM: \;Sankar Das Sarma\,&n bsp\;”Searching for Topological Majorana Zero Modes”

    11:00 AM - 11: 55 AM: \;Tadashi Machida\, \;"Searching f or Majorana quasiparticle in Iron-based superconductors"

    12:00 PM - 12:55 PM: \;Erik Bakkers\, \;“Reducing disorder in Semiconduc tor/superconductor nanowires”

    1:00 PM - 1:55 PM: \;Jes per Nygård\, "Hybrid nanowires\, dots and bound states towards topological devices”

    2:00 PM - 2:55 PM: \;Roland Wiesendanger\, \; "Emergent Majorana zero modes in disorder-free bottom-up fabricated atomic spin chains proximity-coupled to clean superconducting Re and Nb substrates "

    3:00 PM - 3:55 PM: \;Georgios Katsaros\,  \;“InAs/Al full-shell nanowires and proximitized Ge hole gases: Suitable pl atforms for the realization of Majorana zero modes?”

    4: 00 PM - 4:55 PM: \;Peter Liljeroth\, \;”Topological superconduc tivity in designer van der Waals heterostructures”

    5:00 PM - 6:00 PM: \;Tudor Stanescu\, \;“How far away is the Majora na zero mode? Landmarks in the desert of disorder”


    For furthe r details visit: https://www.physics.umd.edu/cmtc/Majorana%20Conferenc e%202021.pdf

    Please email rcawthor@umd.edu for Zoom details

     LAST-MODIFIED:20210331T160937Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Virtual Conference TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T220000Z DTEND:20220413T005000Z DTSTAMP:20260828T094430Z UID:43dp2nqhdndhh9npsq4ulrqf2d@google.com CREATED:20220210T145852Z DESCRIPTION:Susan Eisenhower presents the film 1984 as part of the Science and Society via Film course. All are welcome. Fo r information and the entire semester's schedule\, see the course website: https://www .physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145925Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: 1984 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T160000Z DTEND:20220330T170000Z DTSTAMP:20260828T094430Z UID:6amcseqnsh73qepjdu5sdatk2t@google.com CREATED:20220207T165055Z DESCRIPTION:Speaker: Gianna Valentino\, Post-doctoral fellow\, A pplie Physics Lab\, John Hopkins University

    Title: Tailoring Damage Pathways via Interfacial Control

    Abstract: \;    Materia l selection is the cornerstone of all engineering applications. In a perfec t world\, materials would not suffer from the classical tradeoff between co mpeting properties\, but would instead possess a synergistic balance for op timal material performance. For example\, the ultimate structural material would have both high strength and ductility\, but the majority of conventio nal materials fall short of this. Metals engineered with particular interfa ces (nanotwins) have shown simultaneous ultrahigh strength and ductility\, but are limited to a relatively small subset of materials that have low sta cking fault energy such as Ag\, Cu\, and stainless steels.

    This seminar w ill discuss results from the synthesis of nanotwinned nickel-molybdenum­ tu ngsten (Ni-Mo-W) alloys that possess ultrahigh strength\, highly anisotropi c plasticity\, low electrical resistivity\, and low thermal expansion that stem from the finely spaced growth twins that form during the deposition pr ocess. Combinatorial techniques were employed to sputter deposit a composit ional spread of NissMoxW1s-x\, alloys and to investigate their physical and mechanical properties as a function of alloy chemistry. The addition of Mo and W was shown to significantly decrease the coefficient of thermal expan sion and provide a route for tailoring the coefficient of thermal expansion and its temperature dependence with compositional control. Microscale mech anical testing elucidated the ultrahigh tensile and compressive strengths o f Ni­ Mo-W alloys\, underpinned by the presence of highly-aligned nanotwins and their effectiveness as obstacles to dislocation motion.

    Taken as a whole\, this study highlights the balance of physical\, thermal\, and me chanical properties for Ni-Mo-W\, driven by nanoscale twin formation. Howev er\, the widespread use of nanotwinned metals is greatly limited by their s mall form factors. Additive manufacturing (AM) exposes components to far-fr om-equilibrium cooling rates and provides a great opportunity to introduce nanotwins into materials. Although still in its infancy\, a study to develo p AM nanotwins in low-stacking fault energy metals is ongoing and the resul ts will be discussed\, along with a spotlight of other novel AM materials\, such as shape memory alloys.

    Bio:

    Dr. Gianna Valentino is a ma terials scientist with a background in mechanics of materials and metallurg y. Her research has focused on fabricating structural materials with high s trength\, ductility\, and thermal stability via far-from-equilibrium proces sing techniques and understanding their deformation mechanisms for use in e xtreme environment applications. She has led numerous research efforts in t he development of novel metallic systems\, including nanotwinned metals\, r efractories\, and shape memory alloys. Gianna received her B.S. in Physics from Saint Joseph's University in 2014\, and her M.S. and Ph.D. in Mechanic al Engineering from Johns Hopkins University in 2016 and 2019\, respectivel y. She joined the Johns Hopkins Applied Physics Laboratory in 2020 as a pos tdoctoral fellow and holds a visiting scientist position with Johns Hopkins University.

    LAST-MODIFIED:20220323T220310Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220914T193000Z DTEND:20220914T213000Z DTSTAMP:20260828T094430Z UID:2ucv5i4i6110acfi6jjbv1et5h@google.com CREATED:20220815T130024Z DESCRIPTION:Speaker: Joan Wernig Sorensen Professor\, Engineering Brown Uni versity

    Title: Dr. Yue Qi

    Abstract: Professor Yue Qi is the J oan Wernig Sorensen Professor of Engineering at Brown University. She recei ved her B.S. degree in Materials Science and Computer Science from Tsinghua University and her Ph.D. degree in Materials Science from Caltech. She spe nt the next 12 years working at the General Motors R&\;D Center. At GM\, she developed multi-scale models starting from the atomistic level to solv e engineering problems related to lightweight alloys\, fuel cells\, and bat teries. She transitioned from industry to academia in 2013 and served on th e faculty in the Chemical Engineering and Materials Science Department at M ichigan State University till 2020.

    Professor Qi and her “Materials Simul ation for Clean Energy” Lab develop multi-scale simulations methods to desi gn materials atom by atom. All of the materials she studied are critically important for an energy-efficient and sustainable future.  \;

    She is passionate about increasing diversity in Engineering and was the inaugu rate Associate Dean for Inclusion and Diversity in the College of Engineeri ng at MSU between 2018-2020.

    LAST-MODIFIED:20220815T130024Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210406T160000 DTEND;TZID=America/New_York:20210406T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210406T160000 CREATED:20200116T204737Z DESCRIPTION:ZOOM RECORDING
    https://umd.hosted.panopto.com/Panopto/Page s/Viewer.aspx?id=7d7c0c33-4626-46a1-8d38-ad02016e15ba


    Join Zoom Meeting
    https://umd.zoom.us /j/99541808638?pwd=VnYrU3d5NmRYelhPZzFxSEhPUFlFZz09

    < b>Meeting ID: 995 4180 8638
    Passcode: 025342

    Title: \;How to enhance physics by making it inclusive

    Speaker: \;Chandralekha Singh\, Department of Physics and Astron omy\, University of Pittsburgh

    Abstract: \;Physics facult y members often only focus on content and pedagogical approaches to improve student engagement and learning in physics courses. However\, students’ mo tivational characteristics can also play an important role in their engagem ent and success in physics. For example\, students’ sense of belonging in a physics class\, their self-efficacy\, and views about whether intelligence in physics is “fixed” or “malleable” can affect engagement and learning. T hese types of concerns can especially impact the learning outcomes of women and racial/ethnic minority students and stereotype threats can exacerbate these issues. In this colloquium\, I will discuss prior research studies th at show how different types of social psychological interventions (e.g.\, s ocial belonging and growth mindset) have improved the motivation and learni ng outcomes of all students\, especially women and underrepresented minorit ies in STEM fields. These interventions include providing data to students about how intelligence is malleable and one can become an expert in a disci pline by working hard in a deliberate manner\, sharing with the students ex amples of testimonials of past students with diverse backgrounds who strugg led initially but then succeeded by working hard and using deliberate pract ice. I will discuss how these ecological interventions were adapted and imp lemented in our physics classes. These types of interventions are short\, r equiring less than one hour of regular class time even though they have the potential to impact student outcomes significantly—especially for women an d other underrepresented students in physics classes. These findings also h ave implications for effectively mentoring students who are doing research in physics. LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T160000Z DTEND:20220202T170000Z DTSTAMP:20260828T094430Z UID:12v4h98fudnp6v18nb869tadma@google.com CREATED:20220125T134629Z LAST-MODIFIED:20220125T134629Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210316T171500Z DTEND:20210316T181500Z DTSTAMP:20260828T094430Z UID:63l20rammi10olhqv1ho5ivp0g@google.com CREATED:20210202T180012Z LAST-MODIFIED:20210202T180012Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR - SPRING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210507T170000Z DTEND:20210507T180000Z DTSTAMP:20260828T094430Z UID:03v6fbs7gmrulqrs5elep51vmj@google.com CREATED:20210202T141948Z DESCRIPTION:Speaker: \; Clare Grey\, Professor\, Department of Chemistry\, University of Cambri dge

    Title: \;Developing and Applying New Tools to Understand How Materials for Li and "Beyond-Li" Battery Technologies Function

    Abst ract: Rechargeable batteries have been an integral part of the portable ele ctronics revolution and are now playing an increasingly important role in t ransport and grid applications\, but the introduction of these devices come s with different sets of challenges. New technologies are being investigate d\, such as those involving reactions between Li and oxygen/sulfur\, using sodium and magnesium ions instead of lithium\, or involving the flow of mat erials in an out of the electrochemical cell (in redox flow batteries). Imp ortantly\, fundamental science is key to producing non-incremental advances and to develop new strategies for energy storage and conversion. \;

    The first part of this talk will focus on our \;work to develop NMR\, M RI and \;X-ray diffraction \;methods that allow devices to be probe d while they are operating (i.e.\, \;operando). This allows tr ansformations of the various cell components to be followed under realistic conditions without having to disassemble and take apart the cell. We can d etect side reactions involving the electrolyte and the electrode materials\ , sorption processes at the electrolyte-electrode interface\, and processes that occur during extremely fast charging and discharging. \; \;Ma ny of the battery electrode materials are paramagnetic and their study has involved the development of new experimental (NMR) and theoretical approach es to acquire and interpret spectra. Recent studies to correlate lithium hy perfine shifts with local structure and to probe dynamics will be described \, focussing on studies aimed to understand degradation in NMC-811 (Li[Ni0.8Co0.1Mn0.1]O2) – graphite full cells. Finally\, new results on redox flow batteries\, extremely high rate batteries and novel NMR approaches to study interfaces will be described.& nbsp\;


    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \; LAST-MODIFIED:20210429T185944Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220506T170000Z DTEND:20220506T174500Z DTSTAMP:20260828T094430Z UID:3d9fk4kmteuuu2coh8le2379b2@google.com CREATED:20220426T182409Z DESCRIPTION:Title: A semidefinite programming based approach to near-term quantum advantage and device certification\nSpeaker: Kishor Bharti (QuICS) \nTime: Friday\, May 6\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Vi a Zoom: https://umd.zoom.us/j/96160177762 \n\nSemidefinite Programming (SDP) is a class of convex optimization pr ograms with vast applications in control theory\, quantum information\, com binatorial optimization\, machine learning and operational research. In thi s talk\, I will discuss how SDP can be used to address two major challenges in quantum computing research: near-term quantum advantage and device cert ification. Towards the first challenge\, I will discuss how to design noisy intermediate-scale quantum (NISQ) algorithms\, that bypass the local minim a problem\, one of the central problems faced by variational quantum algori thms. As an example\, I will discuss a NISQ eigensolver that does not suffe r from any trainability problem\, such as the barren plateau or local minim a problem. In the second part of the talk\, I will discuss how can one use SDPs to give theoretical guarantees regarding the inner functioning of quan tum devices under minimal assumptions. In particular\, I will discuss the s trategies to prove self-testing statements using tools from semidefinite pr ogramming and graph theory.\n\nReferences:\nhttps://arxiv.org/abs/2106.03891\nhttps://journals.aps.org/prl/abstract/10. 1103/PhysRevLett.122.250403\nhttps://journals.aps.org/rmp/abstract/10.1103/RevM odPhys.94.015004\n\n(Pizza and refreshments will be served after the ta lk.) LAST-MODIFIED:20220426T182409Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Kishor Bharti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211112T170000Z DTEND:20211112T174500Z DTSTAMP:20260828T094430Z UID:2qebpqhmnef3m65149hauflv8a@google.com CREATED:20211104T173859Z DESCRIPTION:Title: Anomalous subdiffusion in quantum chains\nSpeaker: Bra yden Ware (QuICS)\nTime: Friday\, November 12\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn typ ical quantum systems with conservation laws\, the approach to equilibrium a t finite temperature is governed by classical hydrodynamics in which charge and energy diffuse. In this talk\, I will discuss some one dimensional qua ntum systems with anomalous hydrodynamic behavior — that is\, systems where diffusion of charge is replaced by subdiffusion or superdiffusion. These s ystems evade the conventional description by being close to integrable poin ts with enhanced symmetries — nonetheless\, recent experiments on similar s ystems have shown that the behavior can be probed with cold atom experiment s.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211104T173859Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Brayden Ware TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210803T133000Z DTEND:20210803T143000Z DTSTAMP:20260828T094430Z UID:2tg4fc9rsg0nh3vqajvh4ucdu9@google.com CREATED:20210727T112645Z DESCRIPTION:
    < /table>
    Title: Quantum Simulation with Ph onons in Trapped Ions

    Zoom link:
    https://umd.zoom.us/j/99142108696

    Speaker:&nb sp\; Ryutaro Ohira\, Osaka University
     \;< br>Abstract:
    Trapped ions are a promising candidate for implementing ana log quantum simulation. By utilizing laser-atom interactions\, individual i on qubits can be initialized\, interacted\, and detected. Since an ion's in ternal degrees of freedom represent a spin-1/2 system\, many experiments ha ve been performed to simulate the interacting quantum spins. For the last d ecade\, an alternative approach has been used to develop a trapped-ion quan tum simulator for bosonic many-body systems. The ions inherently possess an other degree of freedom\, a quantized motional degree of freedom\, i.e.\, p honons. With the capability of deterministic operations together with their bosonic nature\, phonons in trapped ions are excellent resources to realiz e quantum simulations of bosonic quantum many-body systems. In this talk\, I will present progress towards the realization of quantum simulations with phonons in trapped ions\, mainly focusing on the manipulation of multiple local phonons in trapped ions. In the second half of this talk\, I will tal k about a quantum simulation of the Jaynes-Cummings-Hubbard model\, based o n the utilization of multiple local phonons. In this simulation\, we succes sfully observe exotic quantum behavior of quasi-particles.

    Affiliati ons:
    Center for Quantum Information and Quantum Biology\, and Graduate S chool of Engineering Science\, Osaka University LAST-MODIFIED:20210727T112725Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220127T203000Z DTEND:20220127T213000Z DTSTAMP:20260828T094430Z UID:3uuf1q9p9jlug48j4pmj6l0i5h@google.com CREATED:20220125T172337Z DESCRIPTION:RIT on Geometry and Physics organization meeting for Spring 202 2

    This will be an organizational meeting for a seminar (shared by m ath\, applied math\, and physics) on topics in mathematical physics with a geometrical component. Interested students can get course credit.
    Con tact Dr. Jonathan Rosenberg at jmr@umd.edu for more info and Zoom link.
    If you are interested in participating\, please fill out the survey at https://umdsurvey.umd.edu/jfe/form/SV_3qIE8HsZa9YL 9Iy LAST-MODIFIED:20220125T172337Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T140000Z DTEND:20220505T150000Z DTSTAMP:20260828T094430Z UID:2frcqm4ftq8jke473j0i97ekgr@google.com CREATED:20220428T011903Z DESCRIPTION:Title: LDPC Quantum Codes: Recent developments\, Challenges an d Opportunities\nSpeaker: Nikolas Breuckmann (University College London)\n Time: Thursday\, May 5\, 2022 - 10:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/95894683976\n\nQuantum error correc tion is an indispensable ingredient for scalable quantum computing. We disc uss a particular class of quantum codes called "quantum low-density parity- check (LDPC) codes." The codes we discuss are alternatives to the surface c ode\, which is currently the leading candidate to implement quantum fault t olerance. We discuss the zoo of quantum LDPC codes and discuss their potent ial for making quantum computers robust with regard to noise. In particular \, we explain recent advances in the theory of quantum LDPC codes related t o certain product constructions and discuss open problems in the field.\n\n (In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220428T011903Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/95894683976 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Nikolas Breuckmann TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210914T200000Z DTEND:20210914T210000Z DTSTAMP:20260828T094430Z UID:2h1l1vfp8p8pu1jo5fc5nvdg0b@google.com CREATED:20210901T155919Z DESCRIPTION:Title: How to perform the coherent measurement of a curved pha se space\nSpeaker: Dr. Christopher Sahadev Jackson (Sandia National Labora tories)\nTime: Tuesday\, September 14\, 2021 - 4:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/91715806521?pwd=QjBuWTBDODZOVitFVkV5W XU2dHhlUT09\n\nIn quantum optics\, the Hilbert space of a mode of light cor responds to functions on a plane called the phase space (so called because it reminded Boltzmann of oscillators in 2-d real space.) This corresponden ce offers three important features: it can autonomously handle quantum the oretical calculations\, it allows for the infinite-dimensional Hilbert spac e to be easily visualized\, and it is intimately related to a basic experim ental measurement (the so-called heterodyne detection). Continuous phase s pace correspondences exist naturally for many types of Hilbert space beside s this particular infinite-dimensional one. Specifically\, the two-sphere is a natural phase space for quantum spin systems. Although well studied o n the theoretical and visualization fronts\, the corresponding measurement (theoretically referred to as the spin-coherent-state positive-operator-val ued measure or SCS POVM) has yet to find a natural way to be experimentally performed. In this talk\, I will review the history of phase space\, it’s connection to representation theory\, quantization\, coherent states\, and continuous measurement. Finally\, I will explain how the SCS POVM can be simply performed\, independent of the quantization. Such a demonstration i s a fundamental contribution to the theory of continuous quantum measuremen t which revives several differential-geometric ideas from the classical and modern theory of complex semisimple Lie groups. LAST-MODIFIED:20210901T160006Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Dr. Christopher Sahadev Jackson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210201T110000 DTEND;TZID=America/New_York:20210201T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g@google.com RECURRENCE-ID;TZID=America/New_York:20210201T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: \;Supersolidity in the ultracold : when atoms behave as crystal and superfluid at the same time

    Speaker: Francesca Ferlaino\, University of Innsbruck

    Abstract: \;Exotic and counterintuitive phases of quantum matter have been recently discovered in degenerate quantum gases of highly magnetic atoms (Erbium and Dysprosium). The very fact such atoms possess a large magnetic moment means that their interactions at the many-body level and their quantum correlations acquire a unique long-range and anisotropic character. This property opens novel avenues of investigation beyond the co ntact-interaction paradigm.

    In our laboratories\, dipolar Bo se-Einstein condensates and Fermi gases of either Erbium or Dysprosium\, or with dipolar quantum mixtures of both elements are routinely produced. Thi s talk will review the recent developments in atomic dipolar quantum gases from the Innsbruck perspective with particular emphasis to our recent obser vations of the elusive and paradoxical supersolid state of matter\, using b oth Er and Dy ultracold gases. Such paradoxical phase\, in which crystal ri gidity and superfluid flow coexist\, has intrigued scientists across differ ent disciplines for decades. Yet\, the properties of dipolar supersolid are still frontier topics about which many questions remain to be answered fro m either an experimental or theoretical perspective.

    LAST-MODIFIED:20210122T174530Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211203T180000Z DTEND:20211203T190000Z DTSTAMP:20260828T094430Z UID:5s2nhmg5tplvs0f8kt0abp97u3@google.com CREATED:20210914T151430Z DESCRIPTION:Speaker: Natalia Gudino\, Ph.D.\, Staff Scientist\, Neurologica l Disorders and Stroke\, NIH


    Title: TBA


    Abstract: TBA


    Dr. Natalia Gudino received an Elec trical Engineering degree with honors from the National University of Rosar io\, Argentina in 2003. She pursued her graduate training at Case Western R eserve University (CWRU). First\, as a Fulbright Scholar\, she developed a steerable catheter controlled by the MRI system at Dr. Mark Griswold’s lab.

    After earning her M.Sc. (2008) in Biomedical Engine ering\, she started her Ph.D. research working on the development of on-coi l RF amplification to implement parallel transmission (pTx) in MRI. In a jo int collaboration with Dr. Robert Lederman and Dr. Robert Balaban (NHLBI)\, she expl ored the impact of this technology on improving RF safety in an interventio nal MRI setup. After receiving her Ph.D. in 2013\, she joined\, Dr. Jeff Du yn’s lab at LFMI\, \;NINDS\, to develop new on-coil RF amplifiers that can be ut ilized in ultra-high field MRI (≥7T)\, and a novel electronic interface tha t allows control of the new technology by a broad range of commercial syste ms.

    She became a Staff Scientist in the MRI Engineering Core in 2018. Dr. Gudino is an active member of the International Society of Magnetic Re sonance in Medicine and a recipient of the 2017 outstanding teacher award f or lecturing RF engineering. As a Staff Scientist her research mainly focus es on new technologies for RF transmission and signal reception to improve brain imaging at ultra-high field.


    FOR RESEARCHERS

    LAST-MODIFIED:20211122T143430Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211015T193000Z DTEND:20211015T203000Z DTSTAMP:20260828T094430Z UID:78edv8vhcvh1boi08besec3bhb@google.com CREATED:20211005T170547Z DESCRIPTION:Speaker: Professor Pratyush Tiwary\, UMD\n\nTitle: From Atoms t o Mechanisms: Artificial Intelligence Augmented Chemistry for Molecular Sim ulations and Beyond\n\nAbstract: The ability to rapidly learn from high-dim ensional data to make reliable predictions about the future is crucial in m any contexts. This could be a fly avoiding predators\, or the retina proces sing terabytes of data guiding complex human actions. Modern day artificial intelligence (AI) aims to mimic this fidelity and has been successful in m any domains of life. It is tempting to ask if AI could also be used to unde rstand and predict the emergent mechanisms of complex molecules with millio ns of atoms. In this colloquium I will show that certain flavors of AI can indeed help us understand generic molecular and chemical dynamics and also predict it even in situations with arbitrary long memories. However this re quires close integration of AI with old and new ideas in statistical mechan ics. I will talk about such methods developed by my group using different f lavors of generative AI such as information bottleneck\, recurrent neural n etworks and denoising probabilistic models. I will demonstrate the methods on different problems\, where we predict mechanisms at timescales much long er than milliseconds while keeping all-atom/femtosecond resolution. These i nclude ligand dissociation from flexible protein/RNA and crystal nucleation with competing polymorphs. I will conclude with an outlook for future chal lenges and opportunities. LAST-MODIFIED:20211005T173459Z LOCATION:CHEM 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Phys/ANE/ChemPhys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200908T160000 DTEND;TZID=America/New_York:20200908T170000 RRULE:FREQ=WEEKLY;UNTIL=20210126T045959Z;BYDAY=TU EXDATE;TZID=America/New_York:20200908T160000 EXDATE;TZID=America/New_York:20200915T160000 EXDATE;TZID=America/New_York:20200922T160000 EXDATE;TZID=America/New_York:20201215T160000 EXDATE;TZID=America/New_York:20201222T160000 EXDATE;TZID=America/New_York:20201229T160000 EXDATE;TZID=America/New_York:20210105T160000 EXDATE;TZID=America/New_York:20210112T160000 EXDATE;TZID=America/New_York:20210119T160000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com CREATED:20200116T204737Z LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220321T140000Z DTEND:20220321T150000Z DTSTAMP:20260828T094430Z UID:10qad26v0pdddh962bdslip05r@google.com CREATED:20220317T195013Z DESCRIPTION:Speaker: \;Dr. Christian Baals\, T U Kaiserslautern

    Title: Dynamics of ultracold Bosons in tailo red conservative and dissipative potentials

    Abstract: In general\, q uantum states are very sensitive to coupling to the environment. In many ca ses this interaction leads to a loss of coherence and a transformation of t he quantum mechanical system to classical behavior. However\, quantum state s can also be stabilized if the environment and the coupling to it are appr opriately engineered. This is the basic idea of the research results that I will present in this talk.

    In the first part I will show how we ext end the concept of coherent perfect absorption (CPA) to nonlinear systems. CPA is the complete extinction of bidirectional incoming radiation by a com plex potential in a wave-guiding medium\, an effect that relies on the dest ructive interference of reflected and transmitted waves. We find that the c onditions for CPA can be achieved easier than in the linear case since loca lized absorption in a non-linear medium stabilizes the system. Finally\, we experimentally demonstrate CPA for matter waves with an atomic BEC in a on e-dimensional optical lattice with an absorptive site where the absorption is introduced by an electron beam.

    In the second part I will present our studies of a 3D BEC with a dark kink soliton in the presence of locali zed dissipation. By numerically solving the 3D Gross-Pitaevskii equation wi th an imaginary potential we observe the suppression of the snaking instabi lity and extract a threshold value of the dissipation strength for the stab ilization of the dark soliton. Above the stabilization threshold\, we obser ve the attractor dynamics towards the dark soliton when initially starting from a gray soliton. We find that for all initial conditions the dark solit on is the unique steady-state of the system – even when starting from the B EC ground state.

    Host: Ian Spielman     LAST-MODIFIED:20220317T200328Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210331T150000Z DTEND:20210331T160000Z DTSTAMP:20260828T094430Z UID:5vb16nev172o3aale3jmqj9cq6@google.com CREATED:20210322T143735Z LAST-MODIFIED:20210322T143735Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210928T170000Z DTEND:20210928T181500Z DTSTAMP:20260828T094430Z UID:5to7osj1or66cn2pqji23he0qn@google.com CREATED:20210913T181113Z DESCRIPTION:Speaker: \; Gerhard Stock\, University of Freiburg

    T itle: \; \;Learning Biomolecular Collective Variables

    Abstract: The statistical analysis of molecular dynamics simulations requi res dimensionality reduction techniques\, which yield a low-dimensional set of collective variables x_i = x that in some sense describe the essential dynamics of the system. Considering the distribution P(x) of the collective variables\, the primal goal of a statistical analysis is to detect charact eristic features of P(x)\, in particular\, its maxima and their connection paths. This is because these features characterize the low-energy regions a nd the energy barriers of the corresponding free energy landscape\, and the refore amount to the metastable states and transition regions of the system . In this seminar\, we outline a systematic strategy to identify collective variables and metastable states\, which subsequently can be employed to co nstruct a Langevin or a Markov state model of the dynamics. In particular\, we account for the still limited sampling typically achieved by molecular dynamics simulations\, which in practice seriously limits the applicability of theories (e.g.\, assuming ergodicity) and black-box software tools (e.g .\, using redundant input coordinates). We show that it is essential to use internal (rather than Cartesian) input coordinates\, employ dimensionality reduction methods that avoid rescaling errors (such as principal component analysis)\, and perform density based (rather than k-means-type) clusterin g. Finally we discuss a machine learning approach to dimensionality reducti on\, that highlights the essential internal coordinates of a system and may reveal hidden reaction mechanisms.

    F. Sittel and G. Stock\, Perspective Article in J. Chem. Phys 149\, 150901 (2018)

    S.Brandt\, F. Sittel\, M . Ernst\, and G. Stock\, Machine Learning of Biomolecular Reaction Coordina tes\, J. Phys. Chem. Lett. 9\, 2144 (2018) \;


    Where: \;https://go.umd.edu/statphys_zoom< br>
    1:15pm (An informal pre-seminar chat with the speaker\, to which all are invited\, will be held at 1:00pm). LAST-MODIFIED:20210922T143625Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T150000Z DTEND:20210915T161500Z DTSTAMP:20260828T094430Z UID:4ilgj8l2tcilv7f6an2uo3mulo@google.com CREATED:20210720T175312Z DESCRIPTION:Title: Hamiltonian Simulation Algorithms for Near-Term Quantum Hardware\nSpeaker: Toby Cubitt (University College London)\nTime: Wednes day\, September 15\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://u md.zoom.us/j/91501997651?pwd=THEyNEo4bnVkMjB5WldQTm5uait5dz09\n\nThe quantu m circuit model is the de-facto way of designing quantum algorithms. Yet an y level of abstraction away from the underlying hardware incurs overhead. I n the era of near-term\, noisy\, intermediate-scale quantum (NISQ) hardware with severely restricted resources\, this overhead may be unjustifiable. W e develop quantum algorithms for Hamiltonian simulation "one level below" t he circuit model\, exploiting the underlying control over qubit interaction s available in most quantum hardware implementations.\nTo quantify the bene fits\, we apply this to a canonical example: time-dynamics simulation of th e 2D spin Fermi-Hubbard model.\n\nUsing new error bounds for Trotter produc t formulas tailored to the non-asymptotic regime and an analysis of error p ropagation in this "sub-circuit" model\, we improve upon the previous best methods for Hamiltonian simulation by multiple orders of magnitude. E.g. fo r a 5×5 Fermi-Hubbard lattice\, we reduce the circuit depth from 800\,160 t o 440 in the best case. This brings Hamiltonian simulation\, previously bey ond reach of current hardware for non-trivial examples\, significantly clos er to being feasible in the NISQ era.\n\nReference: Clinton\, Bausch\, Cub itt\, Nature Commun. 12\, 4989 (2021)\; arXiv:2003.06886[quant-ph]\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/91501997651?pwd=THEyNEo4bnVkMjB5WldQTm5 uait5dz09\nMeeting ID: 915 0199 7651\nPasscode: 209773\nOne tap mobile\n+13 017158592\,\,91501997651#\,\,\,\,*209773# US (Washington DC)\n+19294362866\ ,\,91501997651#\,\,\,\,*209773# US (New York)\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New York )\n +1 312 626 6799 US (Chicago)\n +1 346 248 7799 US (Housto n)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Taco ma)\nMeeting ID: 915 0199 7651\nPasscode: 209773\nFind your local number: h ttps://umd.zoom.us/u/adyrpKru3p\nJoin by SIP\n91501997651@zoomcrc.com\nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\ n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211.1 44.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n6 5.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24. 110 (Japan Osaka)\nMeeting ID: 915 0199 7651\nPasscode: 209773 LAST-MODIFIED:20210903T123307Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Toby Cubitt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T160000Z DTEND:20220504T170000Z DTSTAMP:20260828T094430Z UID:3dejkgojr5coup30daoto6fr3r@google.com CREATED:20220207T165300Z LAST-MODIFIED:20220207T165300Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211203T170000Z DTEND:20211203T174500Z DTSTAMP:20260828T094430Z UID:1st53u07r6fdq3p4o0o5hhcm9p@google.com CREATED:20211118T164240Z DESCRIPTION:Title: Quantum Routing with Fast Measurements and Classical Fe edback\nSpeaker: Dhruv Devulapalli (QuICS)\nTime: Friday\, December 3\, 202 1 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j /99484119207\n\nTheoretical models of quantum computation usually assume th at 2-qubit gates can be performed between arbitrary pairs of qubits. Howeve r\, in practice\, scalable quantum architectures have qubit connectivity co nstraints\, which can introduce polynomial depth overheads. Compiling quant um algorithms to work on scalable architectures therefore requires optimizi ng arrangements of gates and qubits to minimize these overheads. In this ta lk\, I will discuss the problem of implementing arbitrary permutations of q ubits under interaction constraints in quantum systems that allow for fast local operations and classical communication (LOCC). I will show examples o f speedups over SWAP-based methods by using fast measurement and classical feedback to perform quantum teleportation. Further\, I will describe an exa mple of an interaction graph for which fast LOCC gives a logarithmic speedu p in the worst-case routing time over SWAP-based routing. I will also discu ss limits on the speedup afforded by quantum teleportation.\n\nPizza and dr inks served after the talk. LAST-MODIFIED:20211118T164240Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Dhruv Devulapalli TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T200000Z DTEND:20220228T213000Z DTSTAMP:20260828T094430Z UID:6eji7jkcd51fgfq3lpvloghjgj@google.com CREATED:20220118T144322Z DESCRIPTION:Seminar will be conducted via zoom.

    Sp eaker: Keisuke Harigaya\, CERN

    Title : Parity symmetry breaking scal e and Standard Model parameters

    < br>Abstract : The strong CP problem can be solved by parity symm etry. We first review two classes of models: the ones with the minimal ferm ion content and the ones with the minimal Higgs content. We then focus on t he latter class of models and show that the parity symmetry breaking scale is predicted to be the energy scale at which the standard model Higgs quart ic coupling vanishes. Surprisingly\, after fixing the parity symmetry break ing scale in this way\, the gauge coupling constants unify at a high energy scale. We also discuss a model with a dark matter candidate and show that the dark matter direct detection rate is predicted as a function of the sta ndard model parameters.

    For zoom link please email mknouse@umd.edu     LAST-MODIFIED:20220221T154434Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220912T180000Z DTEND:20220912T190000Z DTSTAMP:20260828T094430Z UID:398b35d8bhv9nuesok3t1h5j6d@google.com CREATED:20220906T154446Z DESCRIPTION:Speaker: Dr. Jim \;Phillips\, an Application Scientist from Zurich Instruments

    Title: How to Use a Lock-in Amplifier to Improve Your Precision Measurement \;

    Abstract: Electronic signals for& nbsp\;precision measurements are \;extremely small. For \;periodic& nbsp\;signals\, lock-in amplifiers \;improve sensitivity by orders  \;of \;magnitude. In this \;presentation\, you will learn \;abo ut the principles and \;characteristics of lock-in \;amplifiers and about applying \;them to NV center \;and other \;precision mea surements.

    Please email Connor Hart ( chart@umd.edu) if you plan to attend. \; LAST-MODIFIED:20220906T154628Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminer - Dr. Jim Phillips from Zurich Instruments TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210212T203000Z DTEND:20210212T213000Z DTSTAMP:20260828T094430Z UID:0r4079tf8hubr0fjkcn89tc72q@google.com CREATED:20210210T193142Z DESCRIPTION:


    Online
    Kara Stamets
    301 405 4471
    stamets k@umd.edu

    Engineering New Solid State Quantum Systems

    Nathalie P. de Leon
    Department of Electrical Engi neering\, Princeton University\, Princeton\, NJ \;

    RSVP: \;https://go.umd.edu/bahdeLeon

    Engineering coherent systems is a central goal of quantum science and quan tum information processing. Point defects in diamond known as color centers are a promising physical platform. As atom-like systems\, they can exhibit excellent spin coherence and can be manipulated with light. As solid-state defects\, they can be produced at high densities and incorporated into sca lable devices. and quantum computers\, and has been demonstrated to be a hi ghly sensitive\, non-invasive magnetic probe capable of resolving the magne tic field of a single electron spin with nanometer spatial resolution. Howe ver\, realizing the full potential of these systems requires the ability to both understand and manipulate diamond as a material. I will present two r ecent results that demonstrate how carefully tailoring the diamond host can open new opportunities in quantum science. First\, currently-known color c enters either exhibit long spin coherence times or efficient\, coherent opt ical transitions\, but not both. We have developed new methods to control t he diamond Fermi level in order to stabilize a new color center\, the neutr al charge state of the silicon vacancy (SiV) center [1\,2]. This center exh ibits both the excellent optical properties of the negatively charged SiV c enter and the long spin coherence times of the NV center\, making it a prom ising candidate for applications as a single atom quantum memory for long d istance quantum communication. Second\, color centers placed close to the d iamond surface can have strong interactions with molecules and materials ex ternal to the diamond\, which makes them promising for nanoscale sensing an d imaging. However\, uncontrolled surface termination and contamination can degrade the color center properties and give rise to noise that obscures t he signal of interest. I will describe our recent efforts to stabilize shal low NV centers within 5 nm of the surface using new surface processing and termination techniques [3]. These highly coherent\, shallow NV centers will provide a platform for sensing and imaging down to the scale of single ato ms. In fact\, many platforms for quantum technologies are limited by noise and loss arising from uncontrolled defects at surfaces and interfaces\, inc luding superconducting qubits\, trapped ions\, and semiconductor quantum do ts. Our approach for correlating surface spectroscopy techniques with singl e qubit measurements to realize directed improvements is generally applicab le to many systems\, and I will describe our recent efforts to tackle noise and microwave losses in superconducting qubits [4].

    References
    B. C. Rose\, D. Huang\, Z. Zhang\, P. Stevenson\, A. M. Tyryshkin\, S. Sangta wesin\, S. Srinivasan\, L. Loudin\, M. L. Markham\, A. M. Edmonds\, D. J. T witchen\, S. A. Lyon\, N. P. de Leon\, Science 361\, 60-63 (2018).
    Z. Zh ang\, P. Stevenson\, G. Thiering\, B. C. Rose\, D. Huang\, A. M. Edmonds\, M. L. Markham\, S. A. Lyon\, A. Gali\, N. P. de Leon\, Physical Review Lett ers 125\, 237402 (2020).
    S. Sangtawesin\, B. L. Dwyer\, S. Srinivasan\, J. J. Allred\, L. V. H. Rodgers\, K. De Greve\, A. Stacey\, N. Dontschuk\, K. M. O'Donnell\, D. Hu\, D. A. Evans\, C. Jaye\, D. A. Fischer\, M. L. Mar kham\, D. J. Twitchen\, H. Park\, M. D. Lukin\, N. P. de Leon\, Review X 9\ , 031052 (2019).
    A. P. M. Place\, L. V. H. Rodgers\, P. Mundada\, B. M. Smitham\, M. Fitzpatrick\, Z. Leng\, A. Premkumar\, J. Bryon\, S. Sussman\, G. Cheng\, T. Madhavan\, H. K. Babla\, B. Jaeck\, A. Gyenis\, N. Yao\, R. J. Cava\, N. P. de Leon\, A. A. Houck\, arXiv:2003.00024.

    Nathalie de Leon is an assistant professor in the Department of Electrical Engineering at Princeton University\, where she started in 2016. Her group focuses on building quantum technologies with color centers in wide bandgap materials such as diamond. She received the Air Force Office for Scientific Research Young Investigator Award in 2016\, the Sloan Research Fellowship in 2017\, the NSF CAREER Award in 2018\, the DARPA Young Faculty Award in 2018\, and the DOE Early Career Award in 2018. She is also on the leadership team of t he Co-design Center for Quantum Advantage\, a DOE National Quantum Informat ion Science Center. She was previously a postdoctoral fellow in the Harvard physics department\, jointly supervised by Mikhail Lukin and Hongkun Park\ , working on cavity QED with diamond nitrogen vacancy (NV) centers integrat ed with diamond-based nanophotonics\, with the goal of realizing scalable s olid-state quantum networks. She received her Bachelor of Science degree in chemistry in 2004 from Stanford\, where she worked under Richard Zare\, an d she earned her Ph.D. in chemical physics in 2011 from Harvard in the lab of Hongkun Park.

     \;

    LAST-MODIFIED:20210210T193142Z LOCATION:Online SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Booz Allen Hamilton Colloquium: "Engineering New Solid State Quantu m Systems\," Nathalie P. de Leon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211203T183000Z DTEND:20211203T193000Z DTSTAMP:20260828T094430Z UID:0ucbo9depb3rkhj2ogscflo7nn@google.com CREATED:20210816T143902Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: David E. Kaplan\, Johns Hopkins University

    Preceded by virtual lunch at 12:30 pm.

    Title: A Causal Modification of Quantum Mechanics

    Abstrac t: We present a modification of quantum mechanics in which a specific class of state-dependent term is added to the Schroedinger Equation. We show th at this term produces non-trivial effects which amount to the ‘wave functio n talking to itself’. We show that these effects are nevertheless causal ( don’t violate relativity) while having profound experimental consequences. We also show that this modification has a simple embedding in local quantu m field theory. While the physical effects are dramatic\, they are also fi ckle\, in that their strength depends on the cosmological history of the wa ve function of the universe. We will present proposals for laboratory (e.g .\, AMO)\, astrophysical\, and cosmological tests that could be done to dis cover such an effect.?

    Seminar Slides LAST-MODIFIED:20211209T181914Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201117T153000 DTEND;TZID=America/New_York:20201117T180000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201117T160000 CREATED:20200116T204737Z DESCRIPTION:IPST Shih-I Pai Lecture\n\nAlan Aspuru-Guzik\, University of To ronto\n\nRegister for the Lecture: https://umd.alumniq.com/index.cfm/events :register/home/eventId/1131\n\n\n3:30 - 4:30 p.m.\nVirtual Lecture by Alán Aspuru-Guzik\, “Where Computational Science Meets Experiment:  Self-Driving Laboratories for Materials Discovery”  \n\n4:30 - 5:00 p.m.\nSpeaker Quest ion and Answer Session with Panelist LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210208T110000 DTEND;TZID=America/New_York:20210208T120000 DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210208T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Deconfinement of Majorana vortex mod es produces a superconducting Landau level

    Speaker:& nbsp\;Carlo Beenakker\, Lorentz Institute\, Leiden

    Abstract: A spatially oscillating pair potential drives a deconfinement tran sition of the Majorana bound states in the vortex cores of a Fu-Kane hetero structure (a 3D topological insulator on a superconducting substrate\, in a perpendicular magnetic field). In the deconfined phase at zero chemical po tential the Majorana fermions form a dispersionless Landau level\, protecte d by chiral symmetry against broadening due to vortex scattering. Unlike a conventional electronic Landau level\, the Majorana Landau level has a non- uniform density profile: quantum interference of the electron and hole comp onents creates spatial oscillations with a wave vector set by the Cooper pa ir momentum that drives the deconfinement transition. The striped pattern a lso provides a means to measure the chirality of the Majorana fermions.



    We are hosting the Spring 2021 JQI Seminars virtually as Zoo m meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom\, we will also b e live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube page at \;https://www.youtube.com/user/JQInews . LAST-MODIFIED:20210203T190442Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T213000Z DTEND:20220228T223000Z DTSTAMP:20260828T094430Z UID:0mgh04275vtl7om8sem0dsl2t5@google.com CREATED:20220211T163732Z DESCRIPTION:Title: Particle Acceleration in Magnetic Reco nnection

    Speaker: Haihong Che\, University of Alabama in Huntsville< br>
    Abstract: \;How magnetic reconnection efficiently produces a hug e number of mildly relativistic energetic particles is an outstanding probl em in solar physics and heliophysics. In particular\, three major problems in solar particle acceleration have to be addressed: 1) the development of power-law energy spectra for both electrons and ions\; 2) the "big number p roblem" of electrons. Recent observations discovered that the time to accel erate electrons to a power-law energy distribution in solar flares can be s horter than 50 ms while nearly the total number of electrons in the current sheet is accelerated in 1000s. 3) Observations suggest that the accelerati on process of ions is related to the electrons'. In this talk\, I will pres ent a novel acceleration mechanism in magnetic reconnection. I will show ho w the velocity shear stored naturally in force-free currents of solar flare s can drive an electron Kelvin-Helmholtz instability (EKHI) during magnetic reconnection. The EKHI efficiently accelerates electrons to a power-law en ergy spectrum with an index comparable to the observations in a few tens of ion gyro-periods (~ 0.1 ms for solar corona plasma). With the proceeding o f reconnection\, the EKHI induced Alfvenic turbulence can accelerate ions t o broken power-law energy spectra.

    Notes: Join the meeting at 4:15 f or meet and greet.  \;Visit https://bi t.ly/2PmJoT6 \;for access     LAST-MODIFIED:20220219T004807Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210503T200000Z DTEND:20210503T210000Z DTSTAMP:20260828T094430Z UID:79fo6m72s41k9nl1g7bh0h9dp2@google.com CREATED:20210111T171207Z DESCRIPTION:

    Title: Microfluidic biophysical models for inherited vascular disease

    Speaker: \;William Polacheck\, Uni versity of North Carolina at Chapel Hill

    Hosted by: \;Giuliano Scarcelli

    Abstract: \;

    Many inherited diseases areassociated with multiple genetic mutations\, requiring multiple animal modelsfor a single disease. Furthermore\, probin g the contributions of biophysicalfactors in disease progression is limited by the ability to manipulate and measuremechanical forces and properties a t the cellular and tissue length scales inliving animals. These limitations introduce challenges for inferring efficacyin humans based on intervention s in animal models\, particularly for diseases inwhich the genetics are not well-characterized\, such as rare inherited diseases.In this talk\, I will discuss efforts by my laboratory to develop microfluidicmodels to address these limitations\, and I will present data from efforts togenerate humaniz ed models of vascular Ehler’s-Danlos syndrome and of vascularand lymphatic malformations. In addition to supporting the overall approach\,results from these models of rare disease provide insight into key mechanicalsignals an d mechanosensory pathways that regulate vascular development andhomeostasis . \;

    Zoom Link:

    Time: \;May 3\, \;2021&n bsp\;    @ 4:00PM Eastern Time (US and Canada) \;  \;
    Join Zo om Meeting
    https://umd.zoom.us/j/92682202606?pwd= Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 260 6
    Passcode: 741889

    LAST-MODIFIED:20210422T182233Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T230000Z DTEND:20220302T015000Z DTSTAMP:20260828T094430Z UID:3npimsl1app1e8voa9jjvgsl16@google.com CREATED:20220210T145045Z DESCRIPTION:Steve Rolston presents the film Silent R unning as part of the Science and Society via Film course. All are welc ome. For information and the entire semester's schedule\, see the course we bsite: http s://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145045Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Silent Running TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220208T160000Z DTEND:20220208T171500Z DTSTAMP:20260828T094430Z UID:2j5an46t18jciqkfio12m65o5r@google.com CREATED:20220131T193120Z DESCRIPTION:Speaker: Dr. Geraldine Seydoux\, Johns Hopkins Unive rsity

    Title: Physical Chemistry Meets Biology: RNA Granule Assembly in C. Elegans

    Abstract: \;https://chem.umd.edu/events/physical-chemistry-meets-biol ogy-rna-granule-assembly-c-elegans     LAST-MODIFIED:20220203T180331Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210224T160000Z DTEND:20210224T170000Z DTSTAMP:20260828T094430Z UID:7b5go5ib92gb3uamc9ll4uhsb4@google.com CREATED:20210217T194837Z DESCRIPTION:Speaker: \;Professor Gaurav Chopra\, Purdue \;Universit y

    Title: \;Engineering Immunology usingChemistry and Data Scienc e

    Abstract: \;Chemical and biological function depends on the in terplaybetween the system and its surrounding where the outcomedepends on t he context of the problem\, typically identified by itsenvironment. How do you represent the context for system andsurroundings at different scales ra nging from atoms to cells? How do you develop molecules with specific prope rties ranging fromcontrolling reactivity to developing immunomodulators as drugleads? How to teach computers to do this by combining physicalmodeling\ , principles of data science\, autonomous measurementsand instrumentation? How to target immune cell function indifferent environments using chemical biology and bioanalyticalchemistry? I will give an overview of my research programin Chemical and Cellular Immunology with selected examples toaddress the above questions including descriptions of chemicaltools and interpreta ble machine learning models with prospectiveexperimental validation in situ \, in vitro and in vivo.

    Where: \;go.umd.edu/pchem_spring2021 LAST-MODIFIED:20210218T170143Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220719T180000Z DTEND:20220719T190000Z DTSTAMP:20260828T094430Z UID:0a2r2vtaqkkqr9j0gc6jssbasl@google.com CREATED:20220717T191541Z DESCRIPTION:Title: Sample-optimal classical shadows for pure states
    Speaker: Hakop Pashayan (Free University Berlin)
    Time: Tuesday\, Jul y 19\, 2022 - 2:00pm
    Location: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91917720452

    Huang \, Kueng\, Preskill introduced the learning task now known as “classical sh adows”: given few copies of an unknown state ρ\, construct a classical desc ription of the state from independent measurements that can be used to pred ict certain properties of the state. Specifically\, they show Θ(B/epsilon^2 ) samples of ρ suffice to approximate the expectation value Tr(Oρ) of any H ermitian observable O to within additive error epsilon provided Tr(O^2) ≤ B and the eigenvalues of O are contained in [-1\,1]. We consider the task of constructing classical shadows with joint measurements and pure unknown st ates. We show Θ(√B/epsilon + 1/epsilon^2) copies are necessary and sufficie nt to construct classical shadows in this setting. LAST-MODIFIED:20220717T191541Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91917720452 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Hakop Pashayan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210202T181500Z DTEND:20210202T191500Z DTSTAMP:20260828T094430Z UID:6k3kongq1vmb96doajhs5adl5a@google.com CREATED:20210126T154741Z DESCRIPTION:Speaker: Mr. Thomas Longo\, UMD

    Title: \; Theory of Phase Transitions Affected by Molecular Interconversion with Applications t o Atomistic Models

    Abstract: \; In this presentation\, I describ e the diffusive and reactive properties of a symmetric mixture of two diffe rent dynamics\, characteristic for conserved and non-conserved order parame ters\, in the presence or absence of an external "source" of interconversio n. I show that the interactions of the two competing dynamics of the order parameter (diffusion and interconversion) results in the phenomenon of "pha se bullying\," when one phase grows at the expense of another one. Also\, I show that the addition of a source of interconversion drives the system aw ay from equilibrium and creates the possibility for arrested phase separati on - the existence of non-growing (steady-state) mesoscopic phase domains. The theoretical description is used to describe the characteristics of four atomistic models.

    ZOOM: \; \;https://go.umd.edu /statphys_spring2021 LAST-MODIFIED:20210126T154741Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210212T190000Z DTEND:20210212T203000Z DTSTAMP:20260828T094430Z UID:0bum200j2sq0d5mit76pocsfrv@google.com CREATED:20210125T120110Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoo m.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UWJVZWVwUT09
    Speaker: Yongzhong Qian\, University of Minnesota

    Title: \ ; Impact of Dark Photon Emission on Massive Star Evolution and Pre-Supernov a Neutrino Signal

    Abstract: \; I will discuss the effects of add itional cooling due to the emission of a dark matter candidate particle\, t he dark photon\, on the final phases of the evolution of a 15 solar mass st ar and the resulting modifications of the pre-supernova neutrino signal. Fo r a substantial portion of the dark photon parameter space the extra coolin g speeds up Si burning\, which results in a reduced number of neutrinos emi tted during the last day before core collapse. In a narrow parameter range\ , low-mass dark photons lead to an increase of the number of emitted neutri nos because of additional shell burning episodes that delay core collapse. Furthermore\, relatively strong couplings produce a thermonuclear runaway d uring O burning\, which could result in a complete disruption of the star b ut requires more detailed simulations to determine the outcome. Our results show that pre-supernova neutrino signals are a potential probe of the dark photon parameter space. LAST-MODIFIED:20210212T141221Z SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220317T150000Z DTEND:20220317T160000Z DTSTAMP:20260828T094430Z UID:6alo8p6h9t4mb41v36hc282dsf@google.com CREATED:20220207T175205Z DESCRIPTION:Speaker: Luan Hoang\, Vo\, UMCP

    Title: Litera ture Seminar


    Abstract: \;https://chem.umd.edu/events/lite rature-seminar-luan-hoang-vo     LAST-MODIFIED:20220307T150019Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211207T160000 DTEND;TZID=America/New_York:20211207T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211207T160000 CREATED:20200116T204737Z DESCRIPTION:Distinguished Scholar-Teacher Lecture

    Professor Peter Shawhan
     \;
    The Simple (and Not-So-Simple) Phy sics of Detecting Gravitational Waves
     \;
    The 2015 det ection of gravitational waves\, from a pair of black holes orbiting each ot her and then merging\, stands out as a triumph of experimental physics.&nbs p\; It was accomplished with the highly sophisticated LIGO detectors which use laser interferometry\, a far cry from the more basic resonant detectors that UMD's Joe Weber first used to hunt for gravitational waves. \; Bo th techniques\, however\, rely on simple physics principles\, and most of t he sophistication is just there to keep the measurement as simple as possib le. \; In this talk aimed at a wide audience\, I will take time to expl ain the basic properties of gravitational waves and how they can be measure d\, and highlight some of the beautifully simple -- but extremely important -- physics at work in the detectors. \;
     \;
    ht tps://umdphysics.umd.edu/about-us/news/department-news/1712-shawhan-dst.htm l
     \;
     \; LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium/DST Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220307T160000 DTEND;TZID=America/New_York:20220307T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220307T160000 CREATED:20220131T204640Z LAST-MODIFIED:20220211T215432Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T140000Z DTEND:20220504T150000Z DTSTAMP:20260828T094430Z UID:0lvdpjp6bepg38hvl819847sv0@google.com CREATED:20220415T002601Z DESCRIPTION:Title: Encoded Silicon Qubits: A High-Performance &\; Scalable Platform for Quantum Computing
    Speaker: Dr. Matthew Rakher (HRL Laboratories)
    Time: Wednesday\, May 4\, 2022 - 10:00am
    Loca tion: PSC 2136 and Virtual Via Zoom:  https://umd.zoom.us/j/91031026741

    For quantum computers to achieve their promise\, regardless of the qubit technology\, significant improvements to both performance and scale are required. Quantum-dot-based qubits in silicon have recently enjoyed dr amatic advances in fabrication and control techniques. The “exchange-only” modality is of particular interest\, as it avoids control elements that ar e difficult to scale such as microwave fields\, photonics\, or ferromagneti c gradients. In this control scheme\, the entirety of quantum computation may be performed using only asynchronous\, baseband voltage pulses on strai ghtforwardly tiled arrays of quantum dots. The pulses control only a singl e physical mechanism\, the exchange interaction\, which exhibits low contro l crosstalk and exceptionally high on/off ratios. Exchange enables universa l logic within a qubit encoding that is robust against certain correlated e rrors. These aspects collectively provide a compelling path toward fault-t olerance. HRL Laboratories has recently demonstrated universal quantum log ic of encoded exchange-only Si spin qubits\, including two-qubit gates perf ormed on arrays of six quantum dots. In this seminar\, we will introduce t he fabrication and operation principles of these encoded Si qubit devices\, and we will show recent experimental results.

    References:
    1. Encoded 2-qubit gate: https:/ /arxiv.org/abs/2202.03605
    2. State preparation and measurement: https://arxiv.org/abs/2112.09801 (https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum .3.010352)
    3. Device Design and Fab: https://arxiv.org/abs/2107.10916 (https://pubs.acs.org/doi/10.1021/ acs.nanolett.1c03026)

    Host: Kartik Srinivasan

    11: 00 am - 12:00 pm ET (discussion time with students/postdocs interested in H RL Laboratories)     LAST-MODIFIED:20220429T223956Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/91031026741 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Dr. Matthew Rakher TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220907T193000Z DTEND:20220907T213000Z DTSTAMP:20260828T094430Z UID:66f4jk2pfkfr1g1dnvfqa60m84@google.com CREATED:20220815T125826Z DESCRIPTION:Speaker: Mary Dorman and Jessica Snyder\, UMD Enviro nmental Safety

    Title: UMD Environmental Safety

    Abstrac t: Research excellence and safety are inextricably intertwined. Safety is a core value of our institution and an integral part of the responsible cond uct of research. The University expects all members of our research communi ty to integrate safety into their research activities\, to strive for excel lence and to go beyond minimum compliance.     LAST-MODIFIED:20220901T134747Z LOCATION:CHEM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T150000Z DTEND:20220412T160000Z DTSTAMP:20260828T094430Z UID:1r3i1umu6vsp3301uisum35ou4@google.com CREATED:20220207T180504Z DESCRIPTION:Speaker: Dr. Dominique Frueh\, Johns Hopkins School of Medicine

    Title: TBD

    Abstract: \;https:// chem.umd.edu/events/speaker-dominique-frueh LAST-MODIFIED:20220207T180504Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T150000Z DTEND:20220406T161500Z DTSTAMP:20260828T094430Z UID:35ekn2u1it5ucukkqqmls6kejk@google.com CREATED:20220331T134010Z DESCRIPTION:Title: How to simulate quantum measurement without computing m arginals\nSpeaker: David Gosset (University of Waterloo/IQC)\nTime: Wedne sday\, April 6\, 2022 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoo m.us/j/91489930870?pwd=Zzhzcjh1K1pGMVhSUzI4VndyZzBLdz09 Meeting ID: 914 8993 0870 Passcode: 202544\n\nIn this work we provide new techniques for a fundamental and ubiquitous task: simulating measurement of a quantum state in the standard basis. Our algorithms reduce the sampling task to computi ng poly(n) amplitudes of n-qubit states\; unlike previously known technique s they do not require computation of marginal probabilities. First we consi der the case where the state of interest is the output state of an m-gate q uantum circuit U. We propose an exact sampling algorithm which involves com puting O(m) amplitudes of n-qubit states generated by subcircuits of U span ned by the first t=1\,2\,…\,m gates. We show that our algorithm can signifi cantly accelerate quantum circuit simulations based on tensor network contr action methods or low-rank stabilizer decompositions. Second\, we consider the case in which ψ is the unique ground state of a local Hamiltonian with a spectral gap that is lower bounded by an inverse polynomial function of n. We prove that a simple Metropolis-Hastings Markov Chain mixes rapidly to the desired probability distribution provided that ψ obeys a certain techn ical condition\, which we show is satisfied for all sign-problem free Hamil tonians. This talk will be mostly based on arXiv:2112.08499 which is joint work with Sergey Bravyi and Yinchen Liu.\n\nJoin Zoom Meeting\n\nhttps://umd. zoom.us/j/91489930870?pwd=Zzhzcjh1K1pGMVhSUzI4VndyZzBLdz09\n\nMeeting I D: 914 8993 0870\nPasscode: 202544 LAST-MODIFIED:20220331T134010Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/91489930870?pwd=Zzhzcjh1K1 pGMVhSUzI4VndyZzBLdz09 Meeting ID: 914 8993 0870 Passcode: 202544 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: David Gosset TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T170000Z DTEND:20220401T174500Z DTSTAMP:20260828T094430Z UID:06cfnm4fpc3mduor4muflakeev@google.com CREATED:20220325T014637Z DESCRIPTION:Title: Monopole Josephson effects in Dirac Spin Liquids\nSpeak er: Gautam Nambiar (University of Maryland)\nTime: Friday\, April 1\, 202 2 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nDirac Spin Liquids (D SLs) are gapless symmetric states in 2+1 dimensions with no magnetic order. They are featureless\, yet interesting because their low energy physics is believed to be described by QED-3\, an effective field theory in terms of gapless Dirac fermions coupled to an emergent U(1) gauge field. They also s erve as a parent state for seemingly unrelated magnetically ordered states\ , where the ordered states arise from condensation of ``monopole excitation s” of the DSL. Can such a description have experimentally observable conseq uences? For example\, can we\, in theory\, induce and measure an emergent e lectric field inside a DSL? We answer this question in the affirmative by p roposing an “Ordered state - DSL - Ordered state” Josephson junction setup. The ordered states can be viewed as condensates of monopoles which can tun nel between the two ordered states through the middle region of DSL. In thi s talk\, we will go through various interesting consequences depending on t he choice of ordered states and operations performed on them. One of them i s a time-dependent emergent electric field inside the DSL. We propose a way to measure this optically via Raman scattering. In the second part of the talk\, we will go back and take a closer look at the field theory operators \, (such as monopoles and emergent flux)\, and describe our attempt to map them to microscopic spin operators.\n\n(Pizza and refreshments will be serv ed after the talk.)\n LAST-MODIFIED:20220325T014637Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Gautam Nambiar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T150000Z DTEND:20220510T160000Z DTSTAMP:20260828T094430Z UID:3sg05s73gduoo97s8cuk5jl7pl@google.com CREATED:20220218T185430Z DESCRIPTION:Speaker: \;Dr. Shinsei Ryu (Princeton Uni versity)
    Where: ATL4402
    Title: \; \;Mult ipartite correlations in topological liquids
    Abstract: \;I wi ll discuss entanglement quantities in two-dimensional topologically-ordered phases that can potentially capture correlations beyond what bipartite ent anglement entropy can. Specifically\, I will present the calculations of th e reflected entropy and entanglement negativity for topological ground stat es when we consider two spatial sub regions. I will also discuss applicatio ns of these ideas to one-dimensional quantum lattice many-body systems.
    Host: Ryohei Kobayashi


    Email emartin3@umd.edu for questions     LAST-MODIFIED:20220505T203422Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T150000Z DTEND:20220510T160000Z DTSTAMP:20260828T094430Z UID:4s5h07ulu3vp0ahitqtbt5kgmj@google.com CREATED:20220207T183307Z DESCRIPTION:Speaker: Dr. Kathrin Breuker\, University of Innsbru ck

    Title: Mass Spectrometry of RNA

    Abstract: \;Mass spectrometry (MS) is an evolving technique in the field of RN A research. This talk will highlight the use of high resolution FT-ICR (Fou rier transform ion cyclotron resonance) MS for the study of RNA modificatio ns and RNA interactions with proteins and small molecule ligands. LAST-MODIFIED:20220510T164747Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210419T200000Z DTEND:20210419T213000Z DTSTAMP:20260828T094430Z UID:7hgnnactafaep1t0m60lcfehvo@google.com CREATED:20210225T163315Z DESCRIPTION:Speaker:  Ashish Alexander\, UMD

    Title: Power and temper ature dependence of High Q superconducting resonators
     
    Abstract:
    An integrated temperature and power dependent model of a resonator internal quality factor predicts the loss contribution from two-level systems and q uasiparticles simultaneously. At millikelvin temperatures\, the sub-gap mic rowave photons generated by the resonator readout power drive the quasipart icle and phonon density far from its thermal equilibrium.
    Here we propos e a two-temperature\, power\, and temperature dependent model to evaluate r esonator losses that define the driven quasiparticle density by a separate effective temperature than the bath temperature. The model also explores th e contribution of the readout power for different power and temperature. Th e model is investigated on the resonators fabricated from epitaxial molecul ar beam epitaxy grown aluminum and titanium nitride on float-zone refined s ilicon. The resonators have quality factors above 1M. The contribution of v arious loss mechanisms is also examined.

    Advisor: Chris Richardson





    Zoom Link  &\;  Log In Information

    Meetin g ID: 911 9803 7643 

    Password:558484 

     LAST-MODIFIED:20210225T163315Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Ashish Alexander\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210902T150000Z DTEND:20210902T163000Z DTSTAMP:20260828T094430Z UID:7e5u3ftjjlqpbv06dfo83msm6d@google.com CREATED:20210818T202052Z DESCRIPTION:Speaker: Yukari Yamauchi\, UMD\n\nTitle: Toward first-principle s calculation of the shear viscosity - classical and quantum approaches\n\n Abstract:\nHydrodynamics successfully describes low-energy modes of a wide class of theories including QCD in the strongly-coupled regime. Some of the low energy constants in the hydrodynamic description of QCD\, such as shea r viscosity\, are difficult to obtain from first principles on a classical computer due to the sign problem. \nOne long-standing way to address sign p roblems is to deform the contour of integration in the path integral to the complex plane. I will explain the conjectured existence of such deformed c ontours which solve the sign problem completely for a certain class of acti ons. \nQuantum computing provides an alternative way to calculate the shear viscosity without a sign problem. Two necessary building blocks of the qua ntum algorithm are the construction of the energy momentum tensor in the Ha miltonian formalism\, and a state preparation algorithm of thermal states. \nLastly\, finite volume effects are always unavoidable and particularly l arge for the foreseeable future in both classical and quantum calculations. We study such effects in molecule dynamics and $\\mathcal{N}=4$ supersymme tric Yang-Mills theory. LAST-MODIFIED:20210901T201058Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T160000Z DTEND:20211216T173000Z DTSTAMP:20260828T094430Z UID:77r70lc0ibhh9k6enku000gr6m@google.com CREATED:20211207T191550Z DESCRIPTION:Title:  A Platform for Cavity Quantum Electrodynamics with R ydberg Atom Arrays

    Speaker: Yu-Ting Chen\, M.I.T.

    Time/Da te:  11:00 am\, Thursday Dec. 16th

    Location: PSC 2136 
    Virtual lo cation:  https: //umd.zoom.us/j/99534083844

    Abstract:
    In cavity quantu m electrodynamics (cavity QED) systems\, the realization of strong coupling between light and atoms plays a critical role in studying quantum optics a nd entanglement.  At the same time\, the Rydberg atom arrays provide a prom ising platform for exploring many-body physics. However\, with the Rydberg- mediated interactions\, the atoms mainly interact with each other locally. Combining the cavity QED and Rydberg arrays systems opens up new research d irections in many-body physics with long-range interactions\, creating a fu lly connected quantum network. Here\, we introduce a new high-finesse cavit y QED setup designed for Rydberg arrays. The setup has a state-of-the-art s ingle-atom cooperativity and will allow more than 50 atoms in the array.  I n addition\, this platform enables the creation of the Rydberg superatom\, an ensemble of atoms acting as a two-level system. Combining the superatoms with the high-finesse cavity\, we expect to increase the single-atom coope rativity by 2 or 3 orders of magnitude. I will present the progress toward realizing strong coupling using this setup. I will also discuss the potenti al applications of studying long-range spin physics.

    Host: Trey Port o LAST-MODIFIED:20211207T191550Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210222T210000Z DTEND:20210222T223000Z DTSTAMP:20260828T094430Z UID:56k37v8ves6b3ja8r69bn5p3ip@google.com CREATED:20210128T160118Z DESCRIPTION:Speaker: Ian Hayes\, UMD\nTitle: "Multi-component superconduc ting order parameter on UTe2"\nAbstract: \nopological superconductivity hol ds great promise both as a trove of new physics and a source of powerful ap plications. However\, progress in the field has been limited by a shortage of candidate materials. The recently discovered triplet superconducting sta te of UTe2 has generated great excitement for this reason\, and motivated a careful study of the superconducting order parameter in this system. This talk will present specific heat data that shows that UTe2 actually possesse s two nearly coincident superconducting transitions\, indicating that the s uperconducting order parameter is multi-component. Through a detailed study of the evolution of these two transitions under applied magnetic fields al ong all three crystal axes\, we have been able to deduce important constrai nts on the symmetry properties of the order parameter. On the basis of this analysis I will discuss the prospects for topological superconductivity in UTe2 as well as possible explanations for the presence of two nearly degen erate superconducting order parameters. \nAdvisor: Paglione\n\n\n\n\nJoin Z oom Meeting\nhttps://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRCTU5UcHlWTTht cEZSdz09\n\nMeeting ID: 969 7573 5470\nPasscode: 005596 LAST-MODIFIED:20210219T174016Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Ian Hayes\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20260828T094430Z UID:7s0fhhdmu3jqfhqr5befljo6cs@google.com CREATED:20220121T163713Z DESCRIPTION:Speaker: \;Dr. Kin Fai Mak (Cornell University)
    Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWU C9zK2J0eXp1NzMvamtNZThDUT09
    Title: \;Kane-Mele-Hubbar d physics in semiconductor moiré materials
    Abstract: \;Semico nductor moiré materials provide a physical realization of the Kane-Mele-Hub bard model for studies of the combined effects of non-trivial band topology and strong electronic correlations. In this talk\, I will discuss the rich electronic phase diagram of the Kane-Mele-Hubbard model realized in AB-sta cked MoTe2/WSe2 \;moiré bilayers. In particular\, I will discuss the emergence of the quantum spin Hall and the quantum anom alous Hall effects\, the realization of the Haldane model\, the nature of t he Chern insulators\, and\, if time permits\, a metamagnetic quantum phase transition between different intervalley coherent states. \;
    Host : \;Jiabin Yu


    Email emartin3@umd.edu for questions     LAST-MODIFIED:20220329T172116Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220221T173000Z DTEND:20220221T190000Z DTSTAMP:20260828T094430Z UID:4ar125k5p6eqsimt15a18s5va4@google.com CREATED:20220218T174901Z DESCRIPTION:Speaker: Ivan Horvath\, Inst. of Nuclear Physics\, C zech Academy of Sciences &\; Univ. of Kentucky

    Title: Effecti ve Dimensions of Dirac Modes in IR Phase of QCD

    Abstract:
    One con sequence of the recently developed effective number theory\, designed to co unt objects with
    probabilities\, is that it leads to a well-defined con cept of effective dimension. Due to the additivity
    of effective numbers \, the latter is a measure-based construct extending the Hausdorff/Minkowsk i-like
    notion of dimension for fixed sets to the stochastic domain. Bot h IR and UV properties can be
    characterized in this way. In this talk I will discuss the recent calculation of IR effective dimension
    of Dirac modes in the IR phase of thermal QCD. Our results support the existence of a non-trivial
    structure in deep IR of the spectrum\, involving low inte ger dimensions. It also implies an unexpected
    non-analyticity structure of Dirac spectrum characteristic to IR phase and associated with Anderson-l ike
    localization properties of IR. The resulting picture is consistent a nd enhances our recent proposal
    that IR phase involves scale invariance in the infrared.     LAST-MODIFIED:20220218T174901Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211111T140000 DTEND;TZID=America/New_York:20211111T153000 DTSTAMP:20260828T094430Z UID:60ve4r7fj59rgcs9pjjsum2rsh@google.com RECURRENCE-ID;TZID=America/New_York:20211111T140000 CREATED:20210924T122442Z DESCRIPTION:Speaker: Peter Hirschfeld\, University of Florida


    Title: Renaissance in the Ruthenates: some Ruminations on a Res olution

    Recent nuclear magnetic resonance studies [A. Pustogow et al .\,

    Nature 574\, 72 (2019)\; Chronister\, arXiv:2007.13730]have chal lenged the prevalent chiral triplet pairing scenario proposed for the canon ical unconventional superconductorSr$_2$RuO$_4$. I present a detailed theor etical study of spin-fluctuation mediated pairing for this compound\, mapp ing out the phase diagram as a function of spin-orbit coupling\, interactio n parameters\, and band-structure properties over physically reasonable ran ges\, comparing when possible with photoemission and inelastic neutron scat tering data information. Even-parity pseudospin singlet solutions are found to dominate large regions of the phase diagram\, leading to suggestions th at accidentally degenerate representations may explain the data. In particu lar\, we propose that an accidentally degenerate combination of extended s and d_xypairingmay explain experiments consistently\, if the microscopic no dal structure of such states is accounted for. If time permits\, I'll discu ss the prospects of direct measurements of the superconducting gap by STM. Interpreting such experiments requires acknowledge of the reconstructed su rface band structure.


    Host: Paglione

    Location: Toll Physi cs Rm 1201
    Seminar also on Zoom: \; \;https://umd.zoom.us/j/91301075848

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080748Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Peter Hirschfeld\, University of Florida TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210301T210000Z DTEND:20210301T220000Z DTSTAMP:20260828T094430Z UID:6bvkcaigq7palpjs9e0lpa2d5i@google.com CREATED:20210111T170458Z DESCRIPTION:

    Title: Mechanisms of UBQLN2-mediated Phase Transition s associated with Protein Quality Control and Neurodegenerative Diseases

    Speaker: \;Carlos Castañeda\, Syracuse University

    Hosted by: \;David Fushman

    Abstract: TBA

    < b>Join Zoom Meeting:

    Time: March 1\, \;2021 \;@ 4: 00PM Eastern Time (US and Canada) \;  \;
    https://umd.zoom. us/j/92682202606?pwd=Z0Y2Qng4aFN3QW9RN0Nndm1TQnEvUT09< /a>
    Meeting ID: 926 8220 2606
    Passcode: 741889

    LAST-MODIFIED:20210204T204737Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211026T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211018T160000 DTSTAMP:20260828T094430Z UID:1n38i0k8ncufh23gk9pqo6153u@google.com CREATED:20210924T113813Z DESCRIPTION:Speaker 1: Richmond Wang
    Speaker 2: Jingnan Cai


     
    Advisor:  

    Title: TBD


    Abstract: TBD

    Note: there will NOT be receptions prior to the ta lk until further notice. LAST-MODIFIED:20210924T113813Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Richmond Wang/Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210624T130000Z DTEND:20210624T140000Z DTSTAMP:20260828T094430Z UID:0tmumf62q2c99kl7asnf0kkj7k@google.com CREATED:20210419T155734Z DESCRIPTION:Economic Inequality from a Statistical Physics Point of View ​
    Victor Yakovenko\, University of Maryland

     \;

    Registration Link

    ​https://zoom.us/j/97858 100666?pwd=Q2RwTmdYc0ZNNjlIdnQrbTdFNkgvQT09​

    ​Meeting ID: 978 5810 0666

    Passcode: 037532

    ​  \;
    https://aub.edu.lb/fas/physics/Pag es/public_policy.aspx LAST-MODIFIED:20210419T155734Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics and Public Policy: Victor Yakovenko TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211214T143000Z DTEND:20211214T153000Z DTSTAMP:20260828T094430Z UID:0pvab412ehh7rd9fvomtqgqdne@google.com CREATED:20211209T142627Z DESCRIPTION:Speaker: Robert Ott\, Heidelberg\n\nTitle: Quantum simulation o f high energy physics\n\nAbstract: Quantum simulation offers the exciting p rospect of investigating quantum field theories with table-top experiments. This allows us to explore phenomena which are hard to access with classica l computation techniques. As an example\, we quantum simulate a one dimensi onal (quantum link) lattice gauge theory both close to and far away from eq uilibrium. Starting from highly excited initial states\, we experimentally follow the dynamics to late times and observe relaxation towards an equilib rium state in agreement with a thermal ensemble.\nI will then describe a sc heme which exploits the spin-changing collisions of ultra-cold atoms to ext end quantum simulations of gauge theories to two dimensions. I will demonst rate how such a quantum simulator would give rise to complex non-equilibriu m evolution as well as charge confinement in a lattice gauge theory.\nAt la st\, I will address the quantum effective action for the far-from-equilibri um evolution of a scalar quantum system\, the possibility of extracting sel f-similar effective interactions from correlation measurements\, and possib le future applications to gauge theory quantum simulations.\n\nSeminar will also be streamed live via zoom: https://umd.zoom.us/j/98955643205?pwd=Rmov U0pjYnZ3ZDQvUSs5c2RhSG1WZz09 LAST-MODIFIED:20211209T142627Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220131T150000 DTEND;TZID=America/New_York:20220131T163000 RRULE:FREQ=WEEKLY;UNTIL=20220228T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20220131T150000 EXDATE;TZID=America/New_York:20220207T150000 DTSTAMP:20260828T094430Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com CREATED:20220208T193739Z DESCRIPTION:Speaker: Selim Hotinli\, JHU\n\nTitle and abstract: tk LAST-MODIFIED:20220209T144016Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220422T170000Z DTEND:20220422T174500Z DTSTAMP:20260828T094430Z UID:5gc0e9bgoahju3ro6gi2hnap7e@google.com CREATED:20220417T003741Z DESCRIPTION:Title: Atomic frequency combs for broadband quantum memory\nSp eaker: Aditya Sharma (JQI)\nTime: Friday\, April 22\, 2022 - 1:00pm\nLoca tion: ATL 2324 and Virtual Via Zoom: htt ps://umd.zoom.us/j/96160177762\n\nQuantum memory will play an important role in quantum networks\, notably as components in quantum repeaters. One promising technique for realizing broadband quantum memory\, the atomic fr equency comb (AFC) protocol\, calls for a material with large inhomogeneous broadening and small homogeneous broadening: spectral-hole burning techniq ues can be used to prepare the absorption spectrum in a periodic pattern of narrow peaks (an AFC). A single photon\, absorbed as a collective excitati on\, will be re-emitted after a time interval fixed by the AFC tooth spacin g. On-demand retrieval can also be realized by using control pulses to impl ement spin-wave storage.\n\nRare-earth-doped crystals like Pr3+:Y2SiO5 are well-suited to the AFC protocol. However\, in many cases the materials have hyperfine structure that limits AFC bandwidth. Here\, we present an experi ment showing that it is possible to work within these constraints to genera te broadband AFCs.\n\n(Pizza and refreshments will be served after the talk .) LAST-MODIFIED:20220417T014229Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Aditya Sharma TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T110000 DTEND;TZID=America/New_York:20210125T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210208T045959Z;BYDAY=MO DTSTAMP:20260828T094430Z UID:7svebhjdkb4jhfuglupc33es0g@google.com CREATED:20210114T020453Z DESCRIPTION:

    Title: TBA

    Speaker: TBA

    Abstract: TBA

    LAST-MODIFIED:20210128T015605Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210409T180000Z DTEND:20210409T200000Z DTSTAMP:20260828T094430Z UID:1078gtq6k55fvkgvo6kmenhehs@google.com CREATED:20210201T213507Z DESCRIPTION:Seminar will be conducted via zoom. \;h https://umd.zoom.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4 UWJVZWVwUT09

    Speaker: Jan Pawlowski\, U Heidelberg

    Title: On the phase structure of QCD

    Abstract:

    In the past d ecade the functional approach to 1st principles QCD has made rapid advances . By now the results for the chiral crossover temperature and observables s uch as quark condensates agree quantitatively with the respective lattice r esults for vanishing and low baryon chemical potential mu_B. The large chem ical potential regime interesting for BES is notoriously difficult to resol ve within QCD. While lattice simulations suffer from the sign problem for c hemical potentials mu_B/T>\; 1-3\, functional approaches are still qualit atively reliable in this regime\, but face a rapidly increasing systematic error within the current approximations.

    In the present talk I give an overview of the current state of the art of 1st principles functional ap proaches (functional renormalisation group\, Dyson-Schwinger equations) to the phase structure of QCD at finite densities. The location of the chiral phase boundary at larger chemical potential and that of the potential criti cal end point\, potential signatures in terms of fluctuations observables a s well as transport properties are discussed. It is argued that the systema tic improvements in functional approaches may allow for quantitative predic tions at large densities (mu_B/T >\; 4) within the next few years. LAST-MODIFIED:20210405T141335Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210125T160000 DTEND;TZID=America/New_York:20210125T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210513T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210215T160000 EXDATE;TZID=America/New_York:20210222T160000 EXDATE;TZID=America/New_York:20210301T160000 EXDATE;TZID=America/New_York:20210125T160000 EXDATE;TZID=America/New_York:20210308T160000 EXDATE;TZID=America/New_York:20210315T160000 EXDATE;TZID=America/New_York:20210322T160000 EXDATE;TZID=America/New_York:20210329T160000 EXDATE;TZID=America/New_York:20210405T160000 EXDATE;TZID=America/New_York:20210412T160000 EXDATE;TZID=America/New_York:20210419T160000 EXDATE;TZID=America/New_York:20210426T160000 EXDATE;TZID=America/New_York:20210503T160000 EXDATE;TZID=America/New_York:20210510T160000 DTSTAMP:20260828T094430Z UID:4vcrk9f2lccfvtoaltqhlruo2j@google.com CREATED:20210105T172544Z DESCRIPTION:Seminar will be conducted via zoom\n\nSpeaker: Andrea Tesi \, F lorence University\n\nTitle and abstract: tk\n\nFor zoom link please email mknouse@umd.edu LAST-MODIFIED:20210105T172544Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T193000Z DTEND:20220330T203000Z DTSTAMP:20260828T094430Z UID:5v8u223gjbj009pnoc2ked5jdn@google.com CREATED:20220324T164220Z DESCRIPTION:Title: Simulating quantum many-body phenomena with superconducting qubits \;

    Speaker: Roman Kuzmin\, JQI\, UMD and NIST

    Abstract: Su perconducting circuits are ubiquitous in quantum simulations\, computing\, and metrology. In this talk\, I will show a superconducting circuit platfor m extended to the extreme\, in which the circuits actually become insulatin g. Remarkably\, such nominally insulating circuits are a valuable resource. They create a tunable high-impedance environment and facilitate exceptiona lly strong interactions between photons and superconducting qubits. This op ens up new directions for analog quantum simulations of interacting many-bo dy problems\, with examples ranging from quantum phase transitions to many- body localization.

    In particular\, I will start with the demo nstration of a dissipative quantum phase transition in \;a Josephson ju nction facing an Ohmic environment. \;Despite many experimental attempt s\, the existence of such a transition remains controversial. Using the hig h-impedance circuit environment\, I will present evidence of the transition with a conceptually new approach\, which relies on monitoring environmenta l degrees of freedom. A similar approach applies to analog quantum simulati ons of other strongly interacting models\, which I will illustrate on two q uantum impurity models relevant to the physics of Luttinger liquids and the Kondo effect. In the latter case\, interactions induced by a quantum impur ity in a finite size system allow us to observe the phenomenon of many-body localization. Finally\, I will argue that the high-impedance circuit platf orm can solve a variety of problems in the area of quantum condensed matter physics.

    LAST-MODIFIED:20220324T171321Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210426T140000Z DTEND:20210426T150000Z DTSTAMP:20260828T094430Z UID:1btit6k3kovs2o35a2d9eipo79@google.com CREATED:20210419T150947Z DESCRIPTION:Title: Schur-Weyl duality and symmetric problems with quantum input\nSpeaker: Laura Mancinska (University of Copenhagen)\nTime: Monday\ , April 26\, 2021 - 10:00am\nLocation: Virtual Via Zoom: https://umd.zoom. us/j/99037346085?pwd=c1ozVU5lVWhLL3RvKzErbCtadDNGQT09\n\nIn many natural si tuations where the input consists of n quantum systems\, each associated wi th a state space C^d\, we are interested in problems that are symmetric und er the permutation of the n systems as well as the application of the same unitary U to all n systems. Under these circumstances\, the optimal algorit hm often involves a basis transformation\, known as (quantum) Schur transfo rm\, which simultaneously block-diagonalizes the said actions of the permut ation and the unitary groups.\n\nI will illustrate how Schur-Weyl duality c an be used to identify optimal quantum algorithm for quantum majority vote and\, more generally\, compute symmetric Boolean functions on quantum data. \n\nThis is based on joint work "Quantum majority and other Boolean functio ns with quantum inputs" with H. Buhrman\, N. Linden\, A. Montanaro\, and M. Ozols.\n\nTopic: IQC-QuICS Math and Computer Science Seminar\nTime: Apr 26 \, 2021 10:00 AM Eastern Time (US and Canada)\n\nJoin Zoom Meeting\nhttps:/ /umd.zoom.us/j/99037346085?pwd=c1ozVU5lVWhLL3RvKzErbCtadDNGQT09\nMeeting ID : 990 3734 6085\nPasscode: 484414\nOne tap mobile\n+13017158592\,\,99037346 085# US (Washington DC)\n+19294362866\,\,99037346085# US (New York)\nDial b y your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New York)\n +1 312 626 6799 US (Chicago)\n +1 2 53 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n +1 6 69 900 6833 US (San Jose)\nMeeting ID: 990 3734 6085\nFind your local numbe r: https://umd.zoom.us/u/aedhbmqRfr\nJoin by SIP\n99037346085@zoomcrc.com\n Join by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.13 1.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amster dam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydn ey)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.2 11.144.160 (Brazil)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMe eting ID: 990 3734 6085\nPasscode: 484414 LAST-MODIFIED:20210419T170842Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T230000Z DTEND:20220216T015000Z DTSTAMP:20260828T094430Z UID:721c899scethscc55ji05o8ml3@google.com CREATED:20220210T143840Z DESCRIPTION:Juan Uriagereka presents the film Arrival a s part of the Science and Society via Film course. All are welcome. For inf ormation and the entire semester's schedule\, see the course website: https://www.phys ics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T144002Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Arrival TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210430T180000Z DTEND:20210430T190000Z DTSTAMP:20260828T094430Z UID:78cuq0v90737ar5k4g2j4rp79u@google.com CREATED:20210201T143108Z DESCRIPTION:Speaker: Sofia Quaglioni\, LLNL

    Title: Noise-resilient q uantum simulation of nuclear dynamics
     \;
    Abstract: Quantum compu ting holds the promise of exact simulations of nuclear matter and dynamics. However\, presently quantum simulations are limited by the buildup of envi ronmental noise across multiple quantum logical gates. I will show how nois e-resilient quantum simulations can be achieved by using a minimal number o f gates\, yielding a 100-fold increase in the quantum simulation time of tw o-neutron spin dynamics.
    Seminar will be conducted via zoom: \;https://umd.zoom.us/j/96371401158?pwd=ZWdmdkJ3cFNEQjBad0R4UW JVZWVwUT09 LAST-MODIFIED:20210415T131222Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T203000Z DTEND:20211117T213000Z DTSTAMP:20260828T094430Z UID:1nltmb8jva8r1uo4onvmu8c5le@google.com CREATED:20211111T152103Z DESCRIPTION:Title : Quantum Acoustics with Superconducting Qubits

    Sp eaker Name: Dr. Andrew N Cleland\, Pritzker School of Molecular Engineering \, University of Chicago

    Abstract : Superconducting qubi ts provide an excellent system for building quantum computing systems\, due to their good individual qubit metrics\, the availability of a high fideli ty two-qubit entangling gate\, and their easy lithographic scaling to large qubit numbers. In addition\, these qubits provide unique opportunities as testbed systems for quantum communication as well as developing hybrid quan tum systems. One compelling opportunity is in quantum acoustics\, where ind ividual phonons can be generated and detected. I will describe our recent p rogress in coupling superconducting qubits to surface acoustic waves at the single phonon level. In one experiment we have demonstrated the quantum co ntrol of a single microwave-frequency mechanical mode in a surface acoustic wave (SAW) resonator. In a second experiment\, we have launched and receiv ed itinerant phonons in an acoustic Fabry-Perot resonator\, and generated a phonon-mediated entanglement between two qubits. While likely my presentat ion won’t have time to cover this. we have further successfully leveraged c oncepts from quantum optics and demonstrated a quantum eraser.






    Contact: Kim Pinckney-Lewis
     \;kimpl@lps.umd.edu


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    LAST-MODIFIED:20211111T152150Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T200000Z DTEND:20220401T210000Z DTSTAMP:20260828T094430Z UID:3vt8kk22g1q31885p0bb79bjck@google.com CREATED:20220323T215949Z DESCRIPTION:Speaker: Dr. Paul Chirik\, Princeton University
    < br>Title: Tobin J. Marks Lecture: The Organometallic Chemistry of Chemicall y Recyclable Plastics

    Abstract: Plastics enable our quality of life in everything from food preservation to disposable facemasks. Since 1950\, over 9 billion tons of plastics have been synthesized. Where have they gone ? Sadly\, almost all of this plastic is still with us today and is now foun d just about everywhere on Earth—from the deepest oceans to mountaintops. W hile a kneejerk reaction may be to ban plastic\, a more thoughtful analysis reveals a more nuanced strategy is needed. My lecture will focus on the fu ndamental chemistry and catalysis required to enable a sustainable plastics age. One area of emphasis will be on the preparation of new polymer micros tructures prepared from abundant hydrocarbon building blocks such as butadi ene are chemically recyclable—re-exposure to the iron catalyst reverts the plastic to pristine monomer. The synthesis and properties of this new cyclo addition polymer and materials derived from it will be presented. A second area of emphasis is the integration of polymerization methods to prepare po lyolefins from monomers derived from CO2. The implications of th ese catalytic reactions on a new\, responsible hydrocarbon future as well a s the fundamental organometallic chemistry will be presented.
    LAST-MODIFIED:20220323T220050Z LOCATION:Chemistry Building 1407 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210914T160000 DTEND;TZID=America/New_York:20210914T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210914T160000 CREATED:20200116T204737Z DESCRIPTION:


    Javad Shabani\, Center for Quantum Phenomena\, Ph ysics Department\, New York University

    Title: Towards Topological Superconductivity in Epitaxial Superconductor-Semicond uctor Materials Systems

    Abstract: \;A central goal in condensed matter physics is to understand and control the order par ameter characterizing the collective state of electrons in quantum heterost ructures. For example\, new physical behaviors can emerge that are absent i n the isolated constituent materials.  \;With regards to superconductiv ity this has opened a whole new area of investigation in the form of topolo gical superconductivity. \;This type of superconductivity is expected t o host exotic quasi-particle excitations including Majorana bound states wh ich hold promise for fault-tolerant quantum computing. In this talk\, we fi rst discuss the important role of epitaxial superconductor-semiconductor hy brid systems as an enabling materials platform. We present unprecedented va lues of transparency and induced gap that could allow us to reach into prev iously unexplored parameter regimes. In wide Josephson junctions exposed to magnetic field\, we observe a minimum of critical current accompanied with a phase jump in the superconducting phase. We discuss this observation as a signature of a transition between trivial and topological superconductivi ty. These findings in addition to new directions in proximitizing edge mode s reveal a versatile two-dimensional platform to explore mesoscopic and top ological superconductivity.

    Host: Johnpierre Paglione LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building - Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220718T150000Z DTEND:20220718T160000Z DTSTAMP:20260828T094430Z UID:69nmbvroh8v42fifsc1fb13dto@google.com CREATED:20220715T165125Z DESCRIPTION:Title: Improved Characterization and Provably Optimal Control of Temporally Correlated Control Noise\nSpeakers: Robert Barr and Colin Tro ut (Johns Hopkins University Applied Physics Laboratory)\nTime: Monday\, Ju ly 18\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd .zoom.us/j/95071159938?pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09 Meeting ID: 950 7115 9938 Passcode: 681204\n\nThe ability to perform fast and robust o perations on multi-qubit quantum systems is a necessity for realizing relia ble quantum computation. Unfortunately\, the inevitable interaction between a quantum system and its environment presents an obstacle for achieving su ch operations. Despite this challenge\, when used in tandem\, quantum noise characterization and quantum control provide a means for engineering targe ted control protocols that achieve noise-robust quantum logic operations in formed by knowledge of the underlying noise properties. In this talk\, we s pecifically focus on the characterization and mitigation of temporally corr elated control noise. First\, we present recent results on characterizing t emporally correlated control noise in the presence of strong dephasing and detuning noise. Through the use of filter design methods\, we will show tha t one can design control waveforms that combine attributes of noise charact erization sequences with attributes of noise suppression sequences. Second\ , we demonstrate an approach for engineering quantum control that optimally mitigates temporally-correlated control noise. Our approach takes the cha racterization of the control noise as input and utilizes model-based descri ptions of the noisy dynamics to frame the search for control solutions as a convex gate-based circuit optimization. When used in concert\, the present ed characterization and control protocols enable improved estimation of con trol noise power spectra and efficient design of noise-tailored provably op timal control.\n\nRobert Barr: 11:00 a.m. to 11:30 a.m\n\nColin Trout: 11 :30 a.m. to 12:00 p.m.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/9507115993 8?pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09\n\nMeeting ID: 950 7115 9938\nPa sscode: 681204\nOne tap mobile\n+13017158592\,\,95071159938#\,\,\,\,*681204 # US (Washington DC)\n+13126266799\,\,95071159938#\,\,\,\,*681204# US (Chic ago)\n\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 646 931 3860 US\n + 1 929 436 2866 US (New York)\n +1 669 444 9171 US\n +1 669 90 0 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 2 48 7799 US (Houston)\nMeeting ID: 950 7115 9938\nPasscode: 681204\nFind you r local number: https://umd.zoom.us/u/adGA 1zZcXi\n\nJoin by SIP\n95071159938@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US We st)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 ( India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 ( Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melb ourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver) \n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 950 7115 9938\nPasscode: 681204 LAST-MODIFIED:20220715T165125Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95071159938? pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09 Meeting ID: 950 7115 9938 Passcode: 68 1204 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Robert Barr and Colin Trout TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210203T160000Z DTEND:20210203T170000Z DTSTAMP:20260828T094430Z UID:06ptok6equ14t7c5nl3jicj2q5@google.com CREATED:20210126T154902Z DESCRIPTION:Speaker: Sarah King\, University of Chicago \;

    Title : Nanoscale Imaging of Rotational Domains and Electronic Structure in Black Phosphorous

    Abstract: \;Many emergent inorganic and organic semicond ucting materials\, such as twodimensional black phosphorus\, are polycrysta lline with grain sizes on the order of10s of nm to 1 m. Edge effects\, grai n boundaries\, and rotational domainscontribute to large morphological vari ations\, resulting in spatially variant potentialenergy surfaces (PESs) for excited charge carriers. These modified PESs can besubstantially different from those of the intrinsic materials\, meaning thatmorphology significant ly impacts excited state dynamics and charge- and energytransport propertie s. Black phosphorous is a two-dimensional allotrope ofphosphorus with a lay er- dependent bandgap spanning the visible to near-IR\,anisotropic light ab sorption and charge transport\, and high charge carrier mobility.I will des cribe new results from my laboratory probing the nanoscale rotationaldomain and electronic structure of black phosphorus using photoemissionelectron m icroscopy. Our initial investigations focus on the impact of layerthickness and crystalline domain orientation heterogeneity on the electronicstructur e and light absorption properties of black phosphorus. Overall\, we seek to identify how the anisotropic properties of black phosphorus could be used t o tuneand steer energy in materials on the nanoscale even in the presence o f materialheterogeneity. I’ll also discuss new efforts in my group to devel op newspectroscopic methods for selectively probing the ultrafast dynamics of buriedinterfaces and how this will help us intentionally design interfac es and materialsfor photocatalysis\, solar cells\, electrochemistry\, or bi ology.

    Where: \;go.umd.edu/pchem_spring2021


    LAST-MODIFIED:20210201T160533Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhysJoint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211005T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210927T160000 DTSTAMP:20260828T094430Z UID:1niue4e9laaniqhk30svmt9cf5@google.com CREATED:20210924T115045Z DESCRIPTION:Speaker 1: Haotong Liang


     
    Advisor:  Ichiro Takeuchi

    Title: In-situ Phase Dete rmination Through Deep Learning Analysis of RHEED Data


    Abstract: A k ey challenge in materials development is the ability to identify material p hase in-situ during synthesis and processing. In this talk\, we present a p hase mapping and determination method based on Reflection High Energy Elect ron Diffraction (RHEED) data as well as a basic introduction to the techniq ue itself. RHEED is an in-situ surface-structure characterization technique commonly used to observe the growth of thin films that produces diffractio n patterns containing a wealth of static and dynamic information. However\, the ability to extract this information is limited by the lack of versatil e systems for automated analysis of the patterns. We used a Deep Learning-b ased tool for automating the analysis of RHEED diffraction patterns. Our me thod combines several supervised and unsupervised learning methods and perm its the extraction of important qualitative and quantitative information ch aracterizing the structure. As a test of the developed pipeline\, we applie d it to map the phase diagram of hematite structures grown under different conditions. With the increased robustness of the information extracted from the RHEED measurements\, one would be able to attain quantitative insight as to the underlying structural phase as well as how the surface structure of a thin film is evolving during the deposition. 


    Note: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T115045Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Haotong Liang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T193000Z DTEND:20211027T203000Z DTSTAMP:20260828T094430Z UID:3ve16trf88gesdkb30kf3p92l4@google.com CREATED:20211020T171922Z DESCRIPTION:Title : Applications of soliton theory to the study of 3D magne tic fields with nested flux surfaces

    Speaker Name: Wrick Sengupta
    Speaker Institution : Princeton University

    Abstract : The theory of solitons has been successfully applied in the past to understand various n onlinear plasma behavior. For example\, the time-dependent derivative nonli near Schrodinger equation (DNLS) describes solitons in weakly nonlinear\, l ong-wavelength\, one-dimensional\, compressible Hall-MHD. The steady-state MHD equilibrium with the isodynamic constraint (magnetic field strength is constant on the flux-surface) is described by the nonlinear Schrodinger equ ation (NLS). A connection with soliton theory can shed light on how singula r currents and island formation may be avoided in MHD. In this work\, we sh ow that the appearance of NLS-like soliton equations and their hierarchy of conserved quantities are ubiquitous in MHD equilibrium with flux surfaces. In particular\, we study three different classes of MHD equilibrium with:< br>i) a circular cross-section near an arbitrary closed 3D magnetic axis\,< br>ii) exact quasisymmetry near a planar flux-surface\,
    iii) quasisymmet ry close to isodynamic.
    In case i)\, we employ near-axis expansions and Hasimoto transformation to show that the rotational transform and its deriv atives are closely related to the NLS hierarchy of invariants.
    In case i i)\, we use near-surface expansion techniques to obtain a class of quasisym metric vacuum magnetic fields near a planar flux surface\, which is describ ed by a reflectionless potential.
    Finally\, in case iii)\, we study pert urbations of exact isodynamic MHD equilibrium that satisfy the quasisymmetr y constraint. Since exact isodynamic fields satisfy NLS\, we seek integrabl e deformations of NLS that allow quasisymmetry to be satisfied globally.
    This work was supported by the U.S.Department of Energy Grant No. DE-FG02- 86ER53223\, the Simons Foundation/SFARI (560651\, AB) and DoE Contract No D EAC02-09CH11466

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211020T171922Z LOCATION:Email swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220131T200000Z DTEND:20220131T213000Z DTSTAMP:20260828T094430Z UID:7ckh614844o0j20jg54j3clt66@google.com CREATED:20220104T152758Z DESCRIPTION:Speaker: Dawid Brzeminski\, UMD\n\nTitle and abstract: tk LAST-MODIFIED:20220125T142438Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T193000Z DTEND:20220316T203000Z DTSTAMP:20260828T094430Z UID:5c50d8b5vo5n0h9i27hnn15fd0@google.com CREATED:20220310T214714Z DESCRIPTION:Title : Neutral-plasma interaction and the Boltzmann collision operator \n\n Speaker Name: George Wilkie\n\n Speaker Institution : PPPL\n\ n Abstract : Neutral atoms and molecules play a critical role in the magnet ic confinement recycling process and in protecting plasma-facing components from extreme plasma heat flux. Predicting their behavior from first princi ples requires direct numerical solution of the Boltzmann transport equation . Monte Carlo methods for doing so are robust and efficient\, especially in the linear and high Knudsen number regimes. An overview of this method\, p resent tools and applications will be presented. Special attention will be paid to the challenges of coupling to first-principles kinetic plasma model s. In order for Monte Carlo to efficiently handle nonlinear processes such as neutral-neutral elastic scattering or charge exchange with non-Maxwellia n ions\, simplified collision operators are often used for good reasons tha t will be discussed. An alternative conservative spectral method is present ed to rigorously handle nonlinear collision operators efficiently in the tr ansition regime\, along with several benchmarks against analytic models and other simulation tools. LAST-MODIFIED:20220310T214714Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211001T160000Z DTEND:20211001T164500Z DTSTAMP:20260828T094430Z UID:31md6g2juj5i9drdno128lcdcg@google.com CREATED:20210924T001057Z DESCRIPTION:Title: Minimum Entanglement Protocols for Function Estimation\ nSpeaker: Jake Bringewatt (QuICS)\nTime: Friday\, October 1\, 2021 - 12:0 0pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/994841 19207\n\nWe derive a family of optimal protocols\, in the sense of saturati ng the quantum Cramér-Rao bound\, for measuring a linear combination of d f ield amplitudes with quantum sensor networks\, a key subprotocol of general quantum sensor networks applications. We demonstrate how to select differe nt protocols from this family under various constraints via linear programm ing. Focusing on entanglement-based constraints\, we prove the surprising r esult that highly entangled states are not necessary to achieve optimality for many problems. Specifically\, we prove necessary and sufficient conditi ons for the existence of optimal protocols using at most k-partite entangle d cat-like states.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210924T001057Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar:Jake Bringewatt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T190000Z DTEND:20220509T203000Z DTSTAMP:20260828T094430Z UID:3h7r9b9fed764a7ta5ot0qardm@google.com CREATED:20220104T152557Z DESCRIPTION:Speaker: Takemichi Okui\, Florida State Unive rsity

    Title: "1+1=4"? The strong CP problem\, small Dirac neutrino m asses\,
    baryogenesis\, and dark matter.

    Abstract: On the one hand \, the QCD axion is a compelling solution to
    the strong CP problem. On t he other hand\, the compositeness of
    right-handed neutrinos offers a nat ural mechanism for small Dirac
    neutrino masses - if the neutrinos turn o ut to be Dirac - and explains
    why the lepton number must be conserved so well. If these two old\,
    completely unrelated extensions of the SM happ en to be both present in
    the theory with no further additions\, it turns out that there exists a
    region in the parameter space where the strong CP problem is solved\,
    neutrinos are naturally Dirac and light\, and the correct cosmological
    baryon asymmetry and dark matter abundance are obt ained\, all
    simultaneously without contradicting existing bounds. In add ition\, the
    theory predicts that \\Delta N_eff >\; 0.14 from CMB and t hat the axion
    mass falls in the range between ~0.01 and ~10 meV. Both pr edictions
    can be tested in near-future CMB and axion experiments.

    Slides
     LAST-MODIFIED:20220510T153335Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220131T160000Z DTEND:20220131T170000Z DTSTAMP:20260828T094430Z UID:7u35hss7sbs6dm1fnqflpahbu4@google.com CREATED:20220121T183334Z DESCRIPTION:Speaker: Cheng Gong\, Department of Electrical and C omputer Engineering and Quantum Technology Center\, University of Maryland\ , College Park

    Title: Efficient Control of Two-Dimensional Magnetism

    Abstract: Emergent two-dimensional (2D) atomic crystals [1\,2] hold great promise for efficient control of magnetism\, fundamentally owing to the 2D nature. However\, thus far\, there have been only proof-of-concept r eports on electrical and optical control of 2D magnetism\, and there appear to be some fundamental obstacles for the efficient control. In this talk\, I will analyze the challenges and present our recent theoretical and exper imental progress on efficient electrical and optical control of 2D magnetis m [3-5]. Specifically\, our results show that the continuous wave laser of 10s of \;mW/(mm)2 \;can effectively change the domain be haviors in 2D magnets\, and 100 mV/nm electric field can effectively change the magnetic anisotropy of 2D magnets. We envision the efficient control o f 2D magnets could open new avenues for the low-power spintronics and photo nics.

    1. \; \; \; \; \; C. Gong et al. \;Natur e \;546\, 265-269 (2017).

    2. \; \; \;  \; \; C. Gong\, X. Zhang. \;Science \;363\, eaav4 450 (2019).

    3. \; \; \; \; \; C. Gong\, et al.&nb sp\;Nature Communications \;10\, 2657 (2019).

    4.&nb sp\; \; \; \; \; S.-J. Gong\, et al. \;PNAS  \;115\, 8511-8516 (2018).

    5. \; \; \; \; \ ; E.-W. Du\, et al. \;Nano Letters \;20\, 7230-7236 ( 2020).


    Host: Charles Clark     LAST-MODIFIED:20220121T183334Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210310T160000Z DTEND:20210310T170000Z DTSTAMP:20260828T094430Z UID:4ogocft4pfv29ffdjkkk3f51se@google.com CREATED:20210302T124150Z DESCRIPTION:Speaker: Professor David Leitner\, Department of Chemistry\, Un iversity of Nevada\, Reno

    Title: Energy Transport in Biomolecules: I dentifying Dynamic Networks and Thermodynamic Properties

    Abstract: E nergy transport in biomolecules contributes to function in a number of ways \, including thermal regulation and chemical reaction dynamics. I will dis cuss some of our theoretical and computational work examining the influence of structure and structural dynamics on thermal flow and networks for vibr ational energy transport in biomolecules. Thermal transport in systems of biomolecules helps regulate the temperature of the cell and involves an int erplay between structure and anharmonic dynamics. Chemical reaction dynami cs involves vibrational dynamics and relaxation\, and I will also discuss t he role of structure and structural dynamics on these processes. By coarse graining energy transport dynamics from the all-atom to residue level\, we have identified a relation between conformational dynamics at equilibrium and rates of energy transfer across non-covalent contacts. Measurements of rates of energy transfer thus provide a window into equilibrium dynamics o f biomolecules and entropy associated with the dynamics of the contact.

    Where: \;go.umd.edu/pchem_spring2021 LAST-MODIFIED:20210303T131905Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210402T160000Z DTEND:20210402T164500Z DTSTAMP:20260828T094430Z UID:2hkb0c952slr1ne6aqgdl5b99u@google.com CREATED:20210324T124947Z DESCRIPTION:Title :< /span> Behavior of Analo g Quantum Algorithms
    Speaker : Lucas Brady
     \;

    Time : 12 - 12:45pm\, Friday\, April 2
    Seminar will be held via Zoom: https://umd.zoom.u s/j/97099328991 and Meeting ID : 970 9932 8991

    Abstract: < span>Analog quantum algorithms are formulated in terms of Hamiltonians rath er than unitary gates and include quantum adiabatic computing\, quantum ann ealing\, and the quantum approximate optimization algorithm (QAOA). \; These algorithms are promising candidates for near-term quantum application s\, but they often require fine tuning via the annealing schedule or variat ional parameters. \; In this work we connect all these algorithms to th e optimal analog procedure. \; Notably\, we explore how the optimal pro cedure approaches a smooth adiabatic procedure but with a superposed oscill atory pattern that can be explained in terms of the interactions between th e ground state and first excited state. \; Furthermore\, we provide num eric and analytic evidence that QAOA emulates this optimal procedure with t he length of each QAOA layer equal to the period of the oscillatory pattern . \; Additionally\, the ratios of the QAOA bangs are determined by the smooth\, non-oscillatory part of the optimal procedure. \; We provide a rguments for these phenomena in terms of the product formula expansion of t he optimal procedure. \; All of this shows that these analog algorithms are all different limits and approximations of the same optimal quantum pr otocol.

     LAST-MODIFIED:20210324T124947Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS-JQI-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210419T200000Z DTEND:20210419T210000Z DTSTAMP:20260828T094430Z UID:4fuuhfijra7dsm2nmb56i8pa6p@google.com CREATED:20210111T170852Z DESCRIPTION:

    Title: \; \;Improving drug discover y through molecular simulation

    Speaker: \;Alex Dick son\, \;Michigan State University

    Hosted by: \;Pra tyush Tiwary

    Abstract:

    Despite decades of advances in co mputing\, genomics and structural biology\, we are still unable to predict which candidates will be successful \;during drug development. This gre atly increases the cost of bringing a new drug to market\, which contribute s to the rising costs of health care. \;The Dickson Lab at MSU works to develop new computational methodologies for modeling molecular interaction s that are relevant to drug \;activity. This includes novel algorithms to simulate ligand unbinding events that typically occur on timescales that are millions of times longer \;than typical molecular dynamics simulat ions. From these trajectories we can identify and analyze the transition st ates of the ligand release \;pathway that determine the kinetics of lig and binding and release\, which are necessary to model drug action in the b ody. This talk will also present a general scheme to predict molecular prop erties such as solubility and the \;partition coefficient that can be c ombined with (un)binding rates as inputs to holistic models of drug action in the body. Together these \;developments aim to improve our ability t o predict successes and failures early in the drug development pipeline.


    Zoom Link


    Time: \;April 19\, \;2021&n bsp\;@ 4:00PM Eastern Time (US and Canada) \;  \;
    Join Zo om Meeting
    https://umd.zoom.us/j/92682202606?pwd=Z0Y 2Qng4aFN3QW9RN0Nndm1TQnEvUT09
    Meeting ID: 926 8220 2606
    Pass code: 741889


    LAST-MODIFIED:20210419T150203Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211102T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211025T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20211018T160000 DTSTAMP:20260828T094430Z UID:2b9gplqqt322g9adblrqfbj9lb@google.com CREATED:20210924T113854Z DESCRIPTION:Speaker 1: 


     
    Advisor:  

    Title: 

    Abstract: LAST-MODIFIED:20210924T113854Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: No Class TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220411T160000 DTEND;TZID=America/New_York:20220411T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220411T160000 CREATED:20220131T204640Z DESCRIPTION:

    Title: Nb3Sn Film Characterization with Nonli near Microwave Response in the Superconducting State

    Abstract: The mi croscopic origins of Superconducting Radio Frequency (SRF) cavity breakdown by surface defects are not completely understood. In particular\, a clear indication of which defects are harmful for SRF operation\, and which are n ot\, is important to establish. Here we study Nb3Sn-on-Nb film\, which is a promising material for SRF cavity. To locally study the electro dynamics of superconductors\, a near-field magnetic microwave microscope wa s built. We study the 3rd harmonic response as a function of rf field ampli tude and temperature. We find evidence for 2 superconducting transitions wi th transition temperatures around 6.3 K and 6.7 K\, respectively. One possi ble explanation of such impurities is that they come from stochiometric iss ue of Nb3Sn. Besides the 2 impurity phases\, we also observe a t emperature-independent mechanism of the 3rd harmonic response in weak appli ed field regime. One possibility is early vortex penetration due to high su rface roughness of the sample.



    April 11\, 2022& nbsp\;    Monday 4pm
    Rm 1201 Toll Physics:

    Z oom LInk: \;https://umd. zoom.us/j/97265681008 LAST-MODIFIED:20220406T002410Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Chung-Yang Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210326T170000Z DTEND:20210326T180000Z DTSTAMP:20260828T094430Z UID:52h1idq0apshvoaf292hut2k8d@google.com CREATED:20210202T140749Z DESCRIPTION:Speaker: Anthony Johnson\, Professor of Physics and Computer Sc ience &\; Electrical Engineering\, UMBC

    Title: \;Large Third- Order Nonlinearities in Atomic Layer Deposition (ALD) Grown Nitrogen-Enrich ed Ti02 Nanoscale Films

    Abstract: The next-generation of high-speed photonics devices\, such as ultrafast integrated modulators and wavelength converters\, require materials with large third-order optical nonlinearitie s. Typically nonlinear materials are cut from bulk crystals or liquids that are not suitable for integration with complementary metal-oxide-semiconduc tor (CMOS) technology. In addition to all-optical on-a-chip device applicat ions\, materials that exhibit high nonlinear absorption and a fast response time are useful in optical limiting applications\, for the protection of o ptical sensors and the human eye from high intensity light such as lasers. TiOL films\, with a 120-nm nominal thickness\, were deposited by ALO at tem peratures ranging from 100-300°C on quartz substrates\, and were studied us ing a femtosecond thermally managed Z-scan technique. TiOL films prepared b y physical vapor deposition (PVO) at room temperature were used as control samples. The as-grown ALO films deposited at 150-300°C exhibited values for nL\, the nonlinear index of refraction\, between 0.6 x 1 o-\,u and 10 x 1 o-\,u cmL/W\, which is 4-6 orders of magnitude larger than previously repor ted. Annealing the films for 3 hours at 450°C in air reduced the nonlineari ties below the detection limit of the experimental setup. Similarly\, as-gr own 100°C ALO and PVO films did not produce a discernable Z-scan trace. The samples were also characterized by x-ray photoelectron spectroscopy (XPS)\ , x-ray diffraction (XRO) and UV-Vis absorption. Compositional analysis usi ng XPS reveals the presence of~ 1 atomic% of Ti-0-N metallic bonds in the f ilms that exhibit the largest nonlinearity. Annealing the samples results i n the oxidation of the metallic bonding and is accompanied by a large decre ase in the nonlinearity. XRO analysis indicates that the as-deposited films are amorphous and the annealed films are partially crystallized. These res ults demonstrate the possibility of a new class of thin-film nonlinear mate rials in which their properties can be tailored by controlling the film com position.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \; \; LAST-MODIFIED:20210308T193244Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210831T171500Z DTEND:20210831T181500Z DTSTAMP:20260828T094430Z UID:41m2tnvogrbbp2s0odjg80jrkb@google.com CREATED:20210831T135806Z LAST-MODIFIED:20210831T135806Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T170000Z DTEND:20211210T174500Z DTSTAMP:20260828T094430Z UID:7cq7nspso24rfn53of1995512q@google.com CREATED:20211130T232239Z DESCRIPTION:Title: Shadow process tomography of quantum channels\nSpeaker: Jonathan Kunjummen (QuICS)\nTime: Friday\, December 10\, 2021 - 12:00pm\ nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9948411920 7\n\nQuantum process tomography is a critical capability for building quant um computers\, enabling quantum networks\, and understanding quantum sensor s. Like quantum state tomography\, the process tomography of an arbitrary q uantum channel requires a number of measurements that scale exponentially i n the number of quantum bits affected. However\, the recent field of shadow tomography\, applied to quantum states\, has demonstrated the ability to e xtract key information about a state with only polynomially many measuremen ts. In this talk\, I will explain how we apply the concepts of shadow state tomography to the challenge of characterizing quantum processes. We make u se of the Choi isomorphism to directly apply rigorous bounds from shadow st ate tomography to shadow process tomography\, and we find additional bounds on the number of measurements that are unique to process tomography. Our r esults\, which include algorithms for implementing shadow process tomograph y\, enable new techniques including evaluation of channel concatenation and the application of channels to shadows of quantum states. Reference: arXi v:2110.03629\n\nPizza and drinks served after the talk. Note: This will be the last Friday Quantum Seminar of the semester. LAST-MODIFIED:20211130T232239Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Jonathan Kunjummen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220208T180000Z DTEND:20220208T191500Z DTSTAMP:20260828T094430Z UID:72i2ig7pejkdqpp8ink5lsn4jp@google.com CREATED:20220131T192138Z DESCRIPTION:Speaker: Professor Ichiro Takeuchi\, UMD\n\nTitle: Closed-Loop Autonomous Combinatorial Experimentation for Streamlined Materials Discover y\n\nAbstract: Machine learning has become an integral part of many aspects of fundamental research. It is particularly useful in high-throughput mate rials exploration where it can be used to predict and navigate a series of experiments\, as well as perform rapid data analysis. In this talk\, I will discuss how we are incorporating active learning in combinatorial screenin g and discovery of functional materials. The array format with which a larg e number of different composition samples are laid out on combinatorial lib raries is particularly conducive to active learning driven autonomous exper imentation. We have previously demonstrated discovery of a new phase change memory (PCM) material using the closed-loop autonomous materials explorati on and optimization (CAMEO) strategy. The discovered PCM material has been tested in various scaled-up device formats and continues to exhibit superio r performance to industrial standards. Recent efforts in developing live au tonomous synthesis–measurement as well as experiment-theory closed loops wi ll be discussed. This work is performed in collaboration with A. Gilad Kusn e\, V. Stanev\, H. Yu\, H. Liang\, M. Li\, E. Pop\, and A. Mehta. This work is funded by SRC\, ONR\, AFOSR\, and NIST. LAST-MODIFIED:20220131T192138Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210908T150000Z DTEND:20210908T161500Z DTSTAMP:20260828T094430Z UID:3luj11ckeenbmoudss9i0notjb@google.com CREATED:20210831T135425Z DESCRIPTION:Title: Learnability of Hamiltonians from quantum many-body Gib bs states\nSpeaker: Anurag Anshu (University of California\, Berkeley)\nTi me: Wednesday\, September 8\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/98711584067 Meeting ID: 987 1158 4067\n\nWe will con sider the problem of learning the Hamiltonian of a quantum many-body system given samples from its Gibbs (thermal) state. The classical analog of this problem\, known as learning graphical models or Boltzmann machines\, is a well-studied question in machine learning and statistics. This talk will de scribe a sample-efficient algorithm for the quantum Hamiltonian learning pr oblem at all constant temperatures. In particular\, we prove that polynomia lly many samples in the number of particles (qudits) are necessary and suff icient for learning the parameters of a spatially local Hamiltonian in l_2- norm. Our main contribution is in establishing the strong convexity of the log-partition function of quantum many-body systems. In the process\, we pr ove a lower bound on the variance of quasi-local operators with respect to the Gibbs state\, which may be of independent interest. LAST-MODIFIED:20210831T135526Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Anurag Anshu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210924T170000Z DTEND:20210924T180000Z DTSTAMP:20260828T094430Z UID:0kkonr7tj4r1gd9fp0867cv303@google.com CREATED:20210914T145104Z DESCRIPTION:Speaker: Ismaila Dabo\, Associate Professor\, Materials Science & Engineering\, Penn State University\n\nTitle: First-Principles Optimizat ion and Discovery of Materials for Energy Conversion and Storage\n\nAbstrac t: Materials innovations require considerable time and resources.This prese ntation will discuss the use of first-principles modeling for optimizing th e properties of materials over relevant time and length scales and for narr owing down the choice of candidate materials for target applications. The f ocus will be on minimizing heat transport in thermoelectric semiconductors and on producing hydrogen fuels photocatalytically by cleaving water molecu les under solar illumination. An overview of the state of the art in electr onic-structure calculations will be given and progress in overcoming the si ze and accuracy limits of these techniques will be highlighted. LAST-MODIFIED:20210914T145104Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20260828T094430Z UID:5rq8970qkp1obv3u342vkf8p7r@google.com CREATED:20220324T162229Z DESCRIPTION:Title: Quantum science with photons and atoms

    Speaker: Nathan Schine\, NIST and JILA\, CU Boulder

    Abstract: Can a material be made of light? Can quantum mechanics help us measure time? These are two questions in quantum science that I di rectly address using the tools of atomic physics and quantum optics. We fir st explore the requirements to make a quantum Hall material made of light. We trap photons inside of a curved-mirror non-planar optical resonator to c onfine the transverse motion of photons and imbue them with an effective ma ss and an effective magnetic field for photons. We add strong repulsive int eractions by hybridizing resonator photons with Rydberg excitations of a co ld atomic gas\, and we observe the formation of the ground state of highly correlated topological matter made of light. We next turn to a broad effort in quantum science—to help us to compute more efficiently and to measure t he world more precisely. In an optical-tweezer-trapped array of strontium a toms\, we leverage recent ideas developed in quantum information processing for related metrological goals. We demonstrate nearly a minute of atomic c oherence on an optical-frequency clock transition. We then generate metrolo gically useful entanglement between clock-transition qubits using Rydberg e xcitations\, and we show that this entanglement persists for approximately four seconds. Beyond enabling quantum-enhanced optical clocks\, this work o pens the door to studies of interacting spin and Hubbard models\, efficient computing architectures\, and database search algorithms.

    Location: PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.edu.

    LAST-MODIFIED:20220324T170746Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220324T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

    Speaker: Jianwei Qiu\, JLab

    Title and abstr act: tk     LAST-MODIFIED:20220209T174415Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220221T160000 DTEND;TZID=America/New_York:20220221T173000 DTSTAMP:20260828T094430Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220221T160000 CREATED:20220131T204640Z DESCRIPTION:
    Title: \;Ultrafast optical control of phonon frequencie s in Fe3GeTe2

    Abstract: \; \;Optical manipulation of coherent phonon frequency in two-dimensional (2D) materials could advance t he development of ultrafast phononics in atomic-thin platforms. Phonon freq uency modulation has been achieved through doping\, strain\, structural or thermal engineering. However\, these approaches are either slow\, irreversi ble\, or damaging to the crystal structure of the material. Here\, we repor t the experimental observation of strong laser-polarization control of cohe rent phonon frequency through time-resolved pump-probe spectroscopic study of van der Waals (vdW) materials Fe3GeTe2. When the polarization of the pum ping laser with tilted incidence is swept between in-plane and out-of-plane orientations\, the frequencies of excited phonons can be monotonically tun ed by as large as 3% (~100 GHz). Our first-principles calculations suggest the strong planar and vertical inter-atomic interaction asymmetry in layere d materials accounts for the observed polarization-dependent phonon frequen cies\, as in-plane/out-of-plane polarization modifies the restoring force o f the lattice vibration differently. Our work provides an insightful unders tanding of the coherent phonon dynamics in layered vdW materials and opens new paths to optically manipulating coherent phonons.



    In-Person Location: Toll Physics Room # 1201Time: 4pm -5:30pm


    Zoom LInk : \;https://umd.zoom.us/j/9 7265681008 LAST-MODIFIED:20220217T170613Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Viviane Zurdo Costa TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221205T160000Z DTEND:20221205T170000Z DTSTAMP:20260828T094430Z UID:7v76ogeun95r8crs9uvdl6f0u2@google.com CREATED:20220824T175752Z DESCRIPTION:Speaker: Tanya Zelevinsky\, Columbia University
    < br>
    Title: Frequency metrology with ultracold molecules

    Abstract: Ultracold atom technologies have transformed our ability to perform high-p recision spectroscopy and apply it to time and frequency metrology. \; Many of the highest-performing atomic clocks are based on laser-cooled atom s trapped in optical lattices. \; These clocks can be applied to fundam ental questions\, for example to improve our understanding of gravity and g eneral relativity. \; In this talk\, I will discuss using lattice-trapp ed ultracold diatomic molecules\, rather than atoms\, as a reference \; for clocks. \; Molecules have more internal quantum states and therefor e are relatively challenging \;to control. \; On the other hand\, t hey offer a large number of prospective clock transitions\, and can help us probe alternative aspects of new physical interactions. \; I will disc uss the current precision limit of molecular metrology\, and possible paths forward.     LAST-MODIFIED:20220826T201140Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Tanya Zelevinsky TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210324T150000Z DTEND:20210324T161500Z DTSTAMP:20260828T094430Z UID:1dn7cshm209s6mrr10l4k3cjji@google.com CREATED:20210319T202411Z DESCRIPTION:Title: 

    Quantum solver of contracted eigenvalue equations for s calable molecular simulations on quantum computing devices

    Speaker:
    David Mazziotti (University of Chicago)

    Location:
    Virtual V ia Zoom: https://umd.zoom.us/j/2821742741?pwd=SWJSRm1D TGFoYUtVMllVSEo5bzdmdz09

    Abstract:

    The accurate computati on of ground and excited states of many-fermion quantum systems is one of t he most important challenges in the physical and computational sciences who se solution stands to benefit significantly from the advent of quantum comp uting devices. Existing methodologies using phase estimation or variational algorithms have potential drawbacks such as deep circuits requiring substa ntial error correction or non-trivial high-dimensional classical optimizati on. Here we introduce a quantum solver of contracted eigenvalue equations\, the quantum analogue of classical methods for the energies and reduced den sity matrices of ground and excited states. The solver enables an iterative refinement of both the energy and two-electron reduced density matrix. It does not require deep circuits or difficult classical optimization and achi eves an exponential speed-up over its classical counterpart. We demonstrate the algorithm though computations on both a quantum simulator and IBM quan tum processing units. LAST-MODIFIED:20210322T132751Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211028T183000Z DTEND:20211028T200000Z DTSTAMP:20260828T094430Z UID:2mk1oil2h62e7k1aul7uvtvfor@google.com CREATED:20211027T173902Z DESCRIPTION:Speaker: Peizhi Du\, Stony Brook University\n\nTitle: New backg rounds and new ideas for sub-GeV dark matter direct detection\n\nAbstract: Probing sub-GeV dark matter requires designing low threshold detectors and understanding backgrounds. In this talk I will address these two issues. Fi rst\, we point out several unexplored low-energy backgrounds in sub-GeV dar k matter searches\, which arise from high-energy particles of cosmic or rad ioactive origin that interact with detector materials. In this talk\, I wil l focus on Cherenkov radiation and luminescence from electron-hole pair rec ombination. We demonstrate that these processes provide plausible explanati ons of the observed events at SENSEI and SuperCDMS HVeV. Second\, we propos e a new idea of probing light dark matter using doped semiconductors. Dopan ts in semiconductors form energy levels that are tens of meV below the cond uction band or above the valence band. These materials can be new detector targets for dark matter scattering with a threshold of tens of meV\, which can probe dark matter masses down to tens of keV.\n\nWill also be streamed via zoom\, for link please email mknouse@umd.edu LAST-MODIFIED:20211027T174526Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar *Special Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220909T160000Z DTEND:20220909T170000Z DTSTAMP:20260828T094430Z UID:2ugd0o54cb0m2kh816khm8qdcv@google.com CREATED:20220906T153931Z DESCRIPTION:Speaker: Graham Reid\, UMD

    Title: Topo logy Through Quantum Evolution with Ultracold Atoms

    Abstract: Concep ts from topology provide insight into wide ranging areas from fluid mechani cs to quantum condensed matter physics. We studied the topology of ultracol d 87Rb atoms in a highly tunable bipartite optical lattice\, using a form o f quantum state tomography\, to measure the full pseudospin state throughou t the Brillouin zone. We used this capability to follow the evolution of tw o topological quantities: the Zak phase and chiral winding number\, after c hanging the lattice configuration. We observed continuous time evolution of the Zak phase and discontinuous changes in the winding number\, depending on the symmetries of the initial state and evolution Hamiltonian. Next\, we studied a topological Floquet system with a linear (Dirac) dispersion crea ted by periodically changing the lattice configuration. We measured the und erlying Floquet topological invariant from the time resolved pseudospin mic romotion.

    Location: \;ATL 2324

    Pizz a and sodas will be served after the talk

     LAST-MODIFIED:20220906T154203Z LOCATION:ATL 2324 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar - Graham Reid TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210505T173000Z DTEND:20210505T183000Z DTSTAMP:20260828T094430Z UID:3mca03bb2jt2r9un9nimi8nncb@google.com CREATED:20210115T153248Z DESCRIPTION:**Special Joint UMD/ JHU Seminar**

    Speaker: Manue l Franco Sevilla\, UMD \;

    Seminar will be conducted via zoom.

    Title: "RK\, RD(*)\, and their cousins: update on the continued challe nges to lepton flavor universality"

    Abstract: A cornerstone of the S tandard Model (SM) is the universality of the electroweak couplings to the three lepton families. This results in an accidental lepton flavor symmetry that is broken in the SM only due to the different masses of the charged l eptons. However\, since 2012\, a series of measurements of decays involving tree-level b → cτν and loop-level b → sℓℓ transitions (the so-called "B an omalies") have repeatedly hinted at the possibility that lepton universalit y may be\, in fact\, violated. This pattern was reinforced in March 2021 wh en LHCb reported a measurement of RK that for the first time deviated from the SM by more than 3σ in a single LFU observable\, one which is affected b y negligible theoretical uncertainties. In this talk I will go over the the current status of LFU measurements with particular emphasis on the most re cent ones\, and will briefly review the prospects for the upcoming LHCb and Belle II datasets to resolve the anomalies one way or another.

    Link to slides: https://cernbox.cern.ch/index.php/s/9rmucfm3R5V0lfP LAST-MODIFIED:20210507T112405Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint UMD/ JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T150000Z DTEND:20220412T160000Z DTSTAMP:20260828T094430Z UID:7p60hucrc502cksphfgbpgbmli@google.com CREATED:20220401T143055Z DESCRIPTION:Quantum information processing based on spins in semiconduct or quantum dots
    Yinyu Liu\, Harvard University

    The field of Quantum Information is of great excitement in both fundamental physics and industry. One promising platform for quantum computing is gate-defined quan tum dots in semiconductors. The greatest limiting factor currently is that delicate quantum states can lose their quantum nature due to interactions w ith their environment. Other open challenges are to coherently control larg e-scale spin qubits and develop methods to entangle quantum bits that are s eparated by significant distances.
    Silicon-based materials are promising due to the long lifetimes of electrons’ quantum states\, but also challeng ing due to the difficulty in fabrication and valley degeneracy. I will repo rt a singlet-triplet qubit with a qubit gate that is assisted by the valley states. This work would potentially relax the design and fabrication requi rement for scaling. Moreover\, strong coupling between electron spins and p hotons in hybrid circuit-QED architecture has been achieved in this researc h field. Quantum optics\, long-distance quantum entanglement\, and communic ation via photons are promised. To address that\, I will present my project in hybrid circuit-QED architecture where we invented a semiconductor singl e atom maser that can be tuned in situ. I will demonstrate that a semicond uctor-based quantum dot is a promising platform for quantum information as well as for fundamental physics. LAST-MODIFIED:20220401T143055Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211109T180000Z DTEND:20211109T190000Z DTSTAMP:20260828T094430Z UID:669gk3ag536to9f785ba4en1ha@google.com CREATED:20210913T184010Z LAST-MODIFIED:20210913T184010Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201201T160000 DTEND;TZID=America/New_York:20201201T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201201T160000 CREATED:20200116T204737Z DESCRIPTION:

    Zoom Meeting: \; \;
    https://umd.zoom.u s/j/97904505754?pwd=L2VJYjVVWUN2QVJrOUR0SjVuUFJHdz09

    Meeting ID: 979 0450 5754 Passcode: 89593 \;

    Speaker: Austin Waters and Ris to Miikkulainen\, University of Texas\, Austin

    Abstract: \; GRAD E is a statistical machine learning system developed to support the work of the graduate admissions committee at the University of Texas at Austin Dep artmentof Computer Science (UTCS). In recent years\, the number of applicat ions to the UTCS PhD program has become too large to manage with a traditio nal review process. GRADE uses historical admissions data to predict how li kely the committee is to admit each new applicant. It reports each predicti on as a score similar to those used by human reviewers\, and accompanies ea ch by an explanation of what applicant features most influenced its predict ion. GRADE makes the review process more efficient by enabling reviewers to spend most of their time on applicants near the decision boundary and by f ocusing their attention on parts of each applicant’s file that matter the m ost. An evaluation over two seasons of PhD admissions indicates that the sy stem leads to dramatic time savings\, reducing the total time spent on revi ews by at least 74%. \; Link to the published paper: \;https://doi.org/10.1609/aimag.v35i1. 2504 \;

    Host: Victor Yakovenko \; LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220422T173000Z DTEND:20220422T183000Z DTSTAMP:20260828T094430Z UID:63ah2p3mqbcl5088jhco59e3i7@google.com CREATED:20220124T181408Z DESCRIPTION:Preceded by virtual lunch at 12:30pm.

    Speaker: Maxim Pospelov\, University of Minnesota-

    Title: Standard M odel and EDMs

    Abstract: I review the main mechanisms that convert fu ndamental CP-violating parameters (theta_QCD and
    Kobayashi-Maskawa phas e) to the observable electric dipole moments (EDMs). In light of recent exp erimental progress\, the
    EDMs connected to electron spin (paramagnetic EDMs) are calculated. The limit on QCD theta angle is 3 * 10^(-8) and
    s omewhat subdominant to neutron EDM\, but can be improved. The Kobayashi-Mas kawa phase contributes to paramagnetic EDMs at the
    level of 10^{-35} e cm in units of equivalent electron EDM\, which is much larger than what was previously estimated. \; \;


    LAST-MODIFIED:20220415T174231Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/UMD Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220217T173000Z DTEND:20220217T190000Z DTSTAMP:20260828T094430Z UID:07vjit33b9r6pa6ff857dcdkhj@google.com CREATED:20220209T170735Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

    Speaker: Wouter Dekens\, UCSD

    Title: \;    < br>Neutrinoless double beta decay in effective field theory


    Abstract: \;
    Neutrinoless double beta decay (NLDBD) is the most sen sitive probe of lepton-number violation. Its discovery would be a clear sig nal of physics beyond the Standard Model\, confirm the Majorana nature of n eutrinos\, and provide insight into scenarios of baryogenesis through lepto genesis. Whenever lepton-number violation arises at a scale well above the electroweak scale\, it can be described by effective interactions in an eff ective-field theory framework. In this talk\, I will outline the necessary steps to assess the impact on NLDBD half lives\, paying special attention t o the matching of the effective interactions onto Chiral Effective Theory a t low energies. Finally\, I will illustrate how this framework can be exten ded to include the effects of light sterile neutrinos and discuss the resul ting constraints on the lepton-number violating interactions. LAST-MODIFIED:20220211T211406Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211025T110000 DTEND;TZID=America/New_York:20211025T120000 DTSTAMP:20260828T094430Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211025T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Charlie Kane\, University of Pennsylvania\n\nTitle: Qu antized Nonlinear Response in Ballistic Metals\n\nAbstract: A dramatic cons equence of the role of topology in the structure of quantum matter is the e xistence of topological invariants that are reflected in quantized response functions. In this talk we will discuss a new variant on this theme. We i ntroduce a non-linear frequency dependent D+1 terminal conductance that cha racterizes a D dimensional Fermi gas\, generalizing the Landauer conductanc e in D = 1. For a ballistic conductor we show that this conductance is quan tized and probes the Euler characteristic of the Fermi sea. We critically address the roles of electrical contacts and of Fermi liquid interactions\ , and we propose experiments on 2D Dirac materials such as graphene using a triple point contact geometry.\n\nHost: Charles Clark LAST-MODIFIED:20220617T080644Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210430T160000Z DTEND:20210430T164500Z DTSTAMP:20260828T094430Z UID:25cl327fjgihhmu7jgedp2fkjd@google.com CREATED:20210421T160223Z DESCRIPTION:
    Title: \;Observation of collectively enhanced quantum b eats without an initial superposition
    Speaker : \;Hyok Sang Han
    T ime : 12 - 12:45pm\, Friday\, April 30
    Seminar will be held via Zoom:&nb sp\;https://umd.zoom.us/j/ 97099328991 \;and Meeting ID : 970 9932 8991

    The quantum bea ts are a well-understood phenomenon that has long been used as a spectrosco pic technique in various systems. Here we demonstrate two new aspects in un derstanding and using quantum beats - (i) coupling to the electromagnetic v acuum allows for beating without an initial superposition between the excit ed levels\, and (ii) by detecting the transmission in the forward direction in a superradiant burst\, quantum beats can be collectively enhanced\, inc reasing the signal strength useful in systems with low signal-to-noise. We derive an analytical expression for the vacuum-induced collective quantum b eats from a superradiant ensemble of three-level V-system atoms. We experim entally observe such dynamics from the forward emission of magneto-opticall y trapped 85Rb atoms illuminated by a weak drive field resonant on only one transition. After a sudden turn-off of the drive\, the subsequent radiativ e dynamics exhibit amplification of the quantum beats proportional to the o verall decay rate\, in excellent agreement with the theory. These new aspec ts of quantum beats may be utilized to enhance spectroscopic precision\, ge nerate entangled photons\, and study the delayed feedback dynamics in waveg uide systems. \; LAST-MODIFIED:20210421T160252Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210920T203000Z DTEND:20210920T213000Z DTSTAMP:20260828T094430Z UID:3du0ehicip3ak5um4sgqj3ut34@google.com CREATED:20210908T024510Z DESCRIPTION:Title: The Earth's Dynamical Radiation Belts: Recent results fr om the Van Allen Probes mission

    Speaker: Shri Kanekal\, NASA Goddard Space Flight Center

    Abstract: The Earth’s radiation belts first dis covered by James Van Allen and named after him\, comprise charged particles trapped in the geomagnetic field. There are two belts separated by the so- called slot region. The outer belt contains chiefly electrons whose intensi ties are highly variable\, being affected by multiple processes of energiza tion and loss. These processes include radial transport\, and wave-particle interactions. The study of these processes is interesting not only scienti fically but also has practical consequences since high intensities of energ etic particles can adversely affect spacecraft and humans in space.
    The Van Allen Probes\, a major NASA mission was launched late August 2012 to st udy the radiation belts in a comprehensive manner. The mission which operat ed until Summer-Fall of 2019\, comprised two identically instrumented space craft carrying a comprehensive suite of instruments that characterize charg ed particles\, electric and magnetic fields\, and plasma waves in the Earth 's radiation belts. In particular\, the ECT suite of instruments comprising of HOPE\, MagEIS and REPT instruments measure electrons\, protons and ions and their angular distributions over energies ranging from a few eV to sev eral tens of MeV. Measurements from Van Allen Probes have made significant and paradigm-shifting contributions towards the understanding of the physic s of charged particles in the Earth's radiation belts.
    I will describe t he Van Allen Probes mission emphasizing the ECT instrument suite and presen t some of the significant science results pertaining to the dynamics of ele ctron energization and loss in the outer radiation belt. \;

    Note s: Visit https://bit.ly/2PmJoT6 \; for access
    LAST-MODIFIED:20210908T024510Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T160000Z DTEND:20220207T170000Z DTSTAMP:20260828T094430Z UID:0gf407ig36vsb4sucnsrgau16c@google.com CREATED:20220121T183403Z DESCRIPTION:Speaker: Vinod Menon\, City College of New Yo rk

    Title: \;Strong exciton-photon interaction in van der Waals m aterials

    Abstract: \;Strong exciton-photon interaction results i n the formation of half-light half-matter quasiparticles called exciton-pol aritons (EPs) that take on the properties of both its constituents. In this talk\, I will first introduce polariton formation in 2D semiconductors &nb sp\;[1] followed by a discussion of Rydberg excitons \;[2] and dipolar excitons  \;[3] to realize highly nonlinear interactions to achieve pol ariton blockade. Following this\, I will discuss the use of strain to contr ol exciton flow and nonlinear response  \;[4]. \; Finally\, I will present some recent results on EPs in correlated van der Waals materials an d their potential to realize hybridization between excitons\, photons and m agnons.

    [1]X. Liu et al.\, Nat. Photonics 9\, 30 (2015).

    [2 ]J. Gu et al.\, Nat. Commun. 12\, 2269 (2021).

    [3]B. Datta et al.\, A rXiv2110.13326 (2021).

    [4]F. Dirnberger et al.\, Sci. Adv. 7\, 3066 ( 2021).


    Host: Mohammad Hafezi     LAST-MODIFIED:20220126T145435Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220126T160000Z DTEND:20220126T171500Z DTSTAMP:20260828T094430Z UID:68r7avf7cga99pv8q5u9th9rs2@google.com CREATED:20220120T141014Z DESCRIPTION:Speaker: Meenal Jain Literature Seminar\n\nTitle: TBA LAST-MODIFIED:20220120T141014Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210331T200000Z DTEND:20210331T213000Z DTSTAMP:20260828T094430Z UID:5cppen5adt3cic7b8u5ifbkfo2@google.com CREATED:20210324T220218Z DESCRIPTION: \;Title: Searches for Dark Forces in CMS

    Speaker: D avid Sperka\, Boston University \;
    Where: Online Via Zoom: \;https://umd.zoom.us/j/960042 66225 \;  \; \;
    Abstract:
    Searches for resonan t particle pair production have played a central role in the development of the standard model of particle physics. In this talk I will briefly review this history before motivating further resonance searches at the LHC. In p articular\, many theories of physics beyond the standard model contain exte nded gauge or scalar sectors and predict new particles that would manifest as resonant production of muon-antimuon pairs. Searches for such particles at the TeV scale are a cornerstone of the LHC search program. Recently\, se arches for much lighter particles (at the GeV scale) have seen renewed inte rest as these particles could play the role of a mediator between the stand ard model and a dark sector. Such particles also arise in several theories that may explain tantalizing hints of new physics in tests of lepton flavor university using b->\;sll processes or the measured value of the muon's anomalous magnetic moment. I will describe the latest searches for relative ly light "dark force" mediators in CMS\, including the first-ever search pe rformed using muons directly reconstructed by the trigger. Finally\, I will comment on the prospects for future dark force searches at CMS during LHC Run 3 and HL-LHC. \; LAST-MODIFIED:20210324T220252Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP/Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T193000Z DTEND:20211006T203000Z DTSTAMP:20260828T094430Z UID:7ntil0i2tseojmo4i55tcqmjjp@google.com CREATED:20210929T181729Z DESCRIPTION:Title : Evolution of large-amplitude Alfven waves and generatio n of switchbacks in the expanding solar wind

    Speaker: Alfred Mallet\ , \;UC-Berkeley

    Abstract : Motivated by recent Parker Solar Prob e observations of “switchbacks” (abrupt\, large- amplitude reversals in the radial magnetic field\, which exhibit Alfvenic correlations) we examine th e dynamics of large-amplitude Alfven waves in the expanding solar wind. We develop an analytic model which makes several predictions: switchbacks shou ld preferentially occur in regions where the solar wind plasma has undergon e a greater expansion\, the switchback fraction at radii comparable to PSP should be an increasing function of radius\, and switchbacks should have th eir gradients preferentially perpendicular to the mean magnetic field direc tion. The expansion of the plasma generates small compressive components as part of the wave’s nonlinear evolution: these are maximized when the norma lized fluctuation amplitude is comparable to sin θ\, where θ is the angle b etween the propagation direction and the mean magnetic field. These compres sive components steepen the primary Alfvenic waveform\, keeping the solutio n in a state of nearly constant magnetic field strength as its normalized a mplitude δB/B grows due to expansion. The small fluctuations in the magneti c-field-strength are minimized at a particular θ-dependent value of β\, usu ally of order unity\, and the density and magnetic- field-strength fluctuat ions can be correlated or anticorrelated depending on β and θ. Example solu tions of our dynamical equation are presented\; some do indeed form magneti c-field reversals. Our predictions appear to match some previously unexplai ned phenomena in observations and numerical simulations\, providing evidenc e that the observed switchbacks can result from the nonlinear evolution of the initially small-amplitude Alfven waves already known to be present at t he coronal base.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210929T181729Z LOCATION:Contact Marc Swisdak at swisdak@umd.edu for Zoom information SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220414T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20220331T123000 EXDATE;TZID=America/New_York:20220324T123000 EXDATE;TZID=America/New_York:20220317T123000 EXDATE;TZID=America/New_York:20220310T123000 EXDATE;TZID=America/New_York:20220303T123000 DTSTAMP:20260828T094430Z UID:7h00ho737srmmhugt5dklv91t3@google.com CREATED:20220308T204846Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

    Speaker: \;Lena Funcke\, MIT

    Title and abstract: tk     LAST-MODIFIED:20220308T204858Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T203000Z DTEND:20220404T213000Z DTSTAMP:20260828T094430Z UID:34o1m4bsm7g9t0eig01i5uq9pb@google.com CREATED:20220128T231737Z DESCRIPTION:Title: STO RM: The Solar-Terrestrial Observer for the Response of the Magnetosphere

    Speaker: David G. Sibeck\, NASA Goddard Space Flight Center

    Abstract: The Solar-Terrestrial Observer for the Response of the Magnetosphere (or STORM) mission was proposed to the 2019 Heliophysics Med ium-Class Explorer opportunity. This self-standing mission would take its o wn observations of the solar wind input whilst imaging the response of the magnetopause location\, auroral oval\, ring current\, plasma sheet\, and ex osphere in soft X-rays\, far-ultraviolet\, suprathermal and energetic neutr als\, and Lyman-a\, respectively\, to provide continuous end-to-end observa tions of the Dungey cycle and geomagnetic storms from a highly-inclined\, c ircular\, orbit with a radius of 30 Earth radii. A dedicated array of red- and green-line auroral imagers deployed across Alaska and Canada complement s the mission by supplying the information needed to determine if and how m icrostructures within the nightside auroral oval trigger substorm onset. Th is presentation focusses on the science motivation and the methodology by w hich the objectives are achieved. In particular\, it describes how the miss ion would distinguish between and quantify fundamental modes of reconnectio n and particle acceleration governing the flow of solar wind energy into an d through the magnetosphere.

    Notes: Join the meeting at 4:15 for mee t and greet
    Visit     https://bit.ly/2PmJoT 6 for access
     LAST-MODIFIED:20220327T144418Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210601T140000Z DTEND:20210601T160000Z DTSTAMP:20260828T094430Z UID:3semjuao55bjms69c4c7h0386c@google.com CREATED:20210514T153105Z DESCRIPTION:Title: Applications and verification of quantum computers \ ;
    Speaker: Shih-Han Hung (QuICS)
    Time: Tuesday\, June 1\, 2021 - 10:0 0am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/95958136789? pwd=dy83YzZOeVova0NvL3pHeWVDNkVxQT09

    Quantum computing devices c an solve problems that are infeasible for classical computers. While rigoro usly proving speedups over existing classical algorithms demonstrates the u sefulness of quantum computers\, analyzing the limits on efficient processe s for computational tasks allows us to better understand the power of quant um computation. Indeed\, hard problems for quantum computers also enable u seful cryptographic applications. In this dissertation\, we aim to underst and the limits on efficient quantum computation and base applications on ha rd problems for quantum computers. We consider models in which a classical machine can leverage the power of a quantum device\, which may be affected by noise or behave adversarially. We present protocols and tools for detect ing errors in a quantum machine and estimate how serious the deviation is. We construct a non-interactive protocol that enables a purely classical pa rty to delegate any quantum computation to an untrusted quantum prover. In the setting of error-prone quantum hardware\, we employ formal methods to c onstruct a logic system for reasoning about the robustness of a quantum alg orithm design. We also study the limits of ideal quantum computers for com putational tasks and give asymptotically optimal algorithms. In particular\ , we give quantum algorithms which provide speedups for the polynomial inte rpolation problem and show their optimality. Finally\, we study the perform ance of quantum algorithms that learn properties of a matrix using queries that return its action on an input vector\, and show that for various linea r algebra problems\, there is no quantum speedup\, while for some problems\ , exponential speedups can be achieved. LAST-MODIFIED:20210519T151216Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS - Dissertation Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210408T140000 DTEND;TZID=America/New_York:20210408T153000 DTSTAMP:20260828T094430Z UID:3iicjv12e2mnpubnkk1l2d0c2r@google.com RECURRENCE-ID;TZID=America/New_York:20210318T140000 CREATED:20210301T221029Z DESCRIPTION:Speaker: Qimiao Si\, Rice University

    Iron-based Super conductivity\, Multi-orbital Correlations and The Tale of d+d Pairing

    Strongly correlated electron systems often show bad-metal behavior\, as op erationally specified in terms of a resistivity at room temperature that re aches or exceeds the Mott-Ioffe-Regel limit. Iron-based superconductors pre sent a striking case study. Their bad metallicity implicates orbital-select ive electron correlations and\, at the same time\, leads to short-range fru strated spin-exchange interactions. These features\, in turn\, have importa nt consequences for the superconducting pairing. One is a quasi-degeneracy in various pairing channels\, and another is the emergence of the so-called orbital-selective pairing [1]. These issues will be introduced in the talk . I’ll then go on to present a unusual pairing state dubbed “d+d” pairing [ 2\,3]\, and describe how its matrix structure in the orbital space has a su rprising formal analogue with its spin-space counterpart in the B-phase of the 3He superfluid [2]. I’ll make the case that the d+d state describes cer tain iron-selenide superconductors (that are among the group of highest Tc iron-based superconductors). In a twist befitting the aspired universal und erstanding across strongly correlated superconductors\, the d+d pairing sta te turns out [2] to also solve a serious new riddle that recently arose in the heavy fermion system CeCu2Si2\, the very first unconventional supercond uctor ever discovered.


    [1] Q. Si\, R. Yu and E. Abrahams\, Nature Reviews Materials 1\, 16017 (2016).

    [2] E. M. Nica and Q. Si\, Npj Q uantum Materials 6\, 3 (2021).

    [3] E. M. Nica\, R. Yu\, and Q. Si\, N pj Quantum Materials 2\, 24 (2017)



    Host: Jeff Lynn

    Link : https://umd.zoom.us/j/91251230757?pwd =MkhFREJrUXNTekVZTTRGQ244M1VBZz09

    Meeting ID: 912 5123 0757
    Password:   558484

    LAST-MODIFIED:20210312T235158Z LOCATION: Online via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Qimiao Si\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211105T170000Z DTEND:20211105T180000Z DTSTAMP:20260828T094430Z UID:1ji3n1bvfhr0a7cohbeo8sdcns@google.com CREATED:20210914T150859Z DESCRIPTION:Speaker: Tim Atherton\, Associate Professor\, Physics &\; As tronomy\, Tufts University

    Title: TBA

    Abstract: \; https://as.tufts.edu/physics/people/faculty/atherton LAST-MODIFIED:20211026T165342Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210202T160000 DTEND;TZID=America/New_York:20210202T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210202T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording: https://umd.hosted.panopt o.com/Panopto/Pages/Viewer.aspx?id=18837ac9-aa65-4b86-ab2e-acc4004911eb


    Time: Feb 2\, 2021 03:30 PM Eastern Time (US and Canada) \;

    Join Zoom Meeting
    https://umd.zoom.us/j/97377397525?pwd=ZjBiS1 NCa3dLTlV4MDhRUklyZU1pZz09

    Meeting ID: 973 7739 7525
    Passcode : 89593

    +13017158592\,\,97377397525# US (Washington D.C)
    +1929436 2866\,\,97377397525# US (New York)


    Speaker: Tom Hartman

    T itle: Wormholes and the Information Paradox

    Abstract:
    Black hole evaporation seems to create entropy in a way that violates quantum mechanic s. This is the essence of Hawking's black hole information paradox. I will describe recent progress on this problem\, including a new result for the e ntropy of Hawking radiation that is compatible with unitary quantum mechani cs\, and discuss the consequences for black holes in quantum gravity. The m echanism is a quantum effect in which virtual wormholes modify the leading- order behavior of highly entangled systems. This is part of a wider set of ideas relating geometry to entanglement.

    Host: Ted Jacobson LAST-MODIFIED:20220120T142431Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T160000Z DTEND:20220316T170000Z DTSTAMP:20260828T094430Z UID:1jgs2c7got384p1bqv1qpjo2k3@google.com CREATED:20220207T164947Z DESCRIPTION:Speaker: Suhas Eswarappa Prameela\, Post-doctoral Scholar\, Hop kins Extreme Materials Institute (HEMI)\, John Hopkins University

    Ti tle: Design of Advanced Materials for Extreme Dynamic Environments

    A bstract: The microstructure of today’s metallic alloys and composites is st eadily rising in complexity because of increasing demands in performance. D esigning better materials for extreme dynamic environments has benefits cut ting across many areas: automobile frames\, vehicle/body armor protection p arts\, aircraft components\, satellite systems\, and multifunctional hypers onic structures. In this talk\, I will describe our design of unique thermo -mechanical processing pathways for several model Mg alloys\, where nucleat ion-controlled kinetics dominate the microstructural evolution. Synergistic experimental and computational efforts unravel fundamental ways to strateg ically tune atomic-scale defects to generate fine solute clusters and achie ve a high density of nanoscale precipitates. These novel microstructures sh ow great promise in dramatically improving Mg alloy properties across diver se\, dynamic environments. Within this presentation\, I will also highlight the Materials and Data for Extreme Environments (MDEE) project\, a new mat erials informatics effort for enabling the high-throughput inverse design a nd manufacturing of advanced materials.

    Bio:

    Suhas Eswarappa Pramee la is a post-doctoral scholar at Hopkins Extreme Materials Institute (HEMI) \, Johns Hopkins University. He is currently a member of Materials in Extre me Dynamic Environments (MEDE) and Materials Science for Extreme Environmen ts (MSEE) research consortia. Prameela's dissertation work has been recogni zed by the People’s choice-Best Poster Award at the Mach conference and fea tured in Nature Reviews Physics. His research interests span metallurgy\, h igh-throughput materials discovery for extreme environments\, mechanical be havior across length scales\, sustainable materials\, metal additive manufa cturing\, and materials informatics. He obtained his Ph.D. (Materials Scien ce and Engineering) from Johns Hopkins University\, and his M.S. in Materia l Science and Engineering from Arizona State University. Several accolades have recognized his diversity and outreach efforts\, including op-eds in pr estigious journals such as Nature\, Science and Nature Materials.

    LAST-MODIFIED:20220307T144509Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210215T210000Z DTEND:20210215T223000Z DTSTAMP:20260828T094430Z UID:0dviitt0ibqsekp6aqlrjub6rm@google.com CREATED:20210128T161828Z DESCRIPTION:Speaker: Tarapada Sarkar\, UMD\n\nTitle: Strange metal transpo rt in electron-doped La 2-x Ce x CuO 4\n\nAbstract: \nI report measurements of normal state resistivity\, Hall Effect\, magnetoresistance and\nthermop ower in the electron-doped cuprate La 2-x Ce x CuO 4 for 0.19≥ x ≥0.08 as a function of\ntemperature. The surprising results are:\nThe normal state ma gnetoresistance exhibits an anomalous linear-in-H behavior [1] at the same\ ndoping and temperature where a linear-in-T resistivity was previously obse rved for H>\;H c2 [2].\nThe normal state Seebeck coefficient\, S/T\, exhi bits an unconventional low temperature –lnT\ndependence at the same doping where linear-in-T and linear-in-H resistivity is found [3].\nThe normal sta te resistivity above Tc\, from 80 K to 400 K\, follows an anomalous ~A(x)T 2\nbehavior at zero field for all doping(x) [4].\nThe normal state resistiv ity upturn for doping x<\;0.14 can be completely suppressed above a\ncert ain magnetic field () and the exposed resistivity at high field has an anom alous linear-in-T\ndependence from 0.7K to ~40K and an anomalous linear-in- H magnetoresistancein the same\ntemperature range [5].\nI conclude that con ventional Fermi liquid theory cannot explain any of these results. Moreover \,\nthe magnitude of the anomalous magnetoresistance and thermopower scales with Tc\, suggesting\nthat the origin of the superconductivity is correlat ed with the strange metal normal state\nproperties. the low temperature lin ear-in-T resistivity\, a hallmark of the strange metal state\, is a\nuniver sal feature of the n-doped cuprates for doping within the SC dome.\n\n1. T. Sarkar et al.\, Sci. Adv. 5\, eaav6753 (2019).\n2. Richard L. Greene\, et al.\, ARCMP 11\, 213 (2020).\n3. P. R. Mandal et al.\, PNAS 116\, 5991 (201 9).\n4. T. Sarkar\, R. L. Greene\, and SD Sarma\, PRB 98\, 224503 (2018).\n 5. T. Sarkar et al.\, arXiv:2007.12765 (2020).\nThese work are supported by the NSF under Grants No. DMR-1708334 and DMR-2002658\,\nAdvisor: Greene\n\ n\n\n\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/96975735470?pwd=V3lPTkdYT HRCTU5UcHlWTThtcEZSdz09\n\nMeeting ID: 969 7573 5470\nPasscode: 005596 LAST-MODIFIED:20210201T141955Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Tarapada Sarkar\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220209T170000Z DTEND:20220209T180000Z DTSTAMP:20260828T094430Z UID:3bviounqb7tnut2f3n70lbmitc@google.com CREATED:20220131T192738Z DESCRIPTION:Speaker: Ekaterina Pomerantseva\, MSE Associate Professor\, Dre xel University

    Title: Chemical Preintercalation Synthesis of Versati le Electrode \;Materials for Electrochemical Energy Storage

    Abst ract: Chemical preintercalation synthesis approach is based on low-temperat ure sol-gel or precipitation process\, and it involves incorporation of ino rganic or organic ions into the structure of the growing oxide phase prior to electrochemical cycling. In this presentation\, Dr. \;Pomerantseva w ill show that chemical preintercalation is a versatile method that can be u sed for the synthesis of a wide family of new oxide phases with layered str uctures\, two-dimensional heterostructures and nanocomposites. She will pre sent the effect of chemically preintercalated ions on electrochemical perfo rmance of these new electrode materials in intercalation batteries. Stabili zation effect enabled by the insertion of electrochemically inactive ions w ill be discussed. Additionally\, the effect of low-temperature annealing on electrochemical stability and rate capability will be shown. Morphological diversity of the chemically preintercalated oxides will be revealed by dis cussing the role of the precursor. \;Pomerantseva will show that chemic al preintercalation of organic molecules can be used to prepare hybrid phas es and nanocomposites. She will also demonstrate the first exfoliation of b ilayered vanadium oxide leading to the formation of free-standing films com posed of ultrathin nanoflakes. The materials and methods developed in this work have the potential to enable next-generation energy storage technologi es.

    Bio:

    Ekaterina Pomerantseva is an Associate Professor of Materi als Science and Engineering at Drexel University. She received a B.S. degre e in Materials Science in 2000\; an M.S. degree in Chemistry and Materials Science in 2003 from Lomonosov Moscow State University\; an M.S. degree in Biochemistry in 2005 from McGill University\, and a Ph.D. degree in Solid-S tate Chemistry in 2007 from Lomonosov Moscow State University.

    Prior to joining Drexel\, \;Pomerantseva held postdoctoral appointments in t he Institute for Systems Research at the University of Maryland College Par k (2010 – 2013) and the Department of Chemistry at the University of Waterl oo (2009 – 2010). She has co-authored over 70 journal papers. In 2018\,&nbs p\;Pomerantseva was selected to receive a prestigious NSF CAREER award\, an d she is also a Scialog Fellow and Stein Fellow.

    Since 2018\, \;P omerantseva has been a senior investigator member of the m2M Center for Mes oscale Transport Properties\, a U.S. Department of Energy\, Office of Scien ce funded Energy Frontiers Research Center. Her research interests lie in t he discovery and development of new solutions and next generation systems f or sustainable energy and clean environment\, with the focus on materials c hemistry and electrochemistry as it relates to energy storage and water tre atment. \;Pomerantseva leads a Material Electrochemistry Group\, the me mbers of which design and apply chemical synthesis methods to obtain materi als with the desired structure and advanced electrochemical properties\, br idging the gap between chemistry and materials science. Her group develops chemical pathways that can be used to realize materials with tunable struct ures and compositions that exhibit high affinity towards ions in solutions\ , rapid electron and ion transport\, and enhanced electrochemical stability . These properties are needed to realize electrochemically-driven energy st orage and water purification devices with high performance.

    LAST-MODIFIED:20220131T192738Z LOCATION:2110 CHE and Virtual attendance is also available via Zoom for tho se who are unable to attend. Please send an email to Sherri Tatum @ statum1 2@umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220216T170000Z DTEND:20220216T180000Z DTSTAMP:20260828T094430Z UID:24f4mu9oh7rbe8tmv0roeukbvf@google.com CREATED:20220207T151746Z DESCRIPTION:Speaker: Elizabeth J. Opila\, Rolls Royce Commonwealth Professo r\, Materials Science and Engineering\, University of Virginia

    Title : a Tale of Two "High Entropy" Ceramics

    Abstract: “High entropy” cer amics\, more aptly termed multi-principal element ceramics\, provide opport unities for new property achievements. In the first story\, oxidation resis tance of high entropy ultra-high ceramics such as refractory metal (Ti\,Zr\ ,Hf\,Nb\,Ta\,Mo\,W) carbides and borides exposed at temperatures between 15 00C to 1800C will be described. Preferential oxidation\, complex oxide form ation and eutectic liquid formation was observed. In this case\, the high e ntropy concept\, while beneficial for mechanical properties\, resulted in d ecreased oxidation resistance. In a second story\, the design of high entro py rare earth silicates for thermal/environmental barrier coatings to co-op timize the thermochemical stability\, thermomechanical behavior\, and therm al properties will be described. Preliminary results demonstrating successf ul property co-optimization through mixing rare earth cations within silica te phases will be presented. These two tales provide counter-examples of th e challenges and opportunities of utilizing the high entropy approach for m aterials design.

    Biography:

    Elizabeth Opila is the Rolls-Royce Commonwealth Professor of Materials Science and Engineering and Director of the Rolls-Royce University Technology Center for Advanced Materials System s at the University of Virginia in Charlottesville\, where she has been sin ce 2010. \; Prior to that she held the position of Materials Research E ngineer at the NASA Glenn Research Center in Cleveland\, OH for 19 years wh ere she worked primarily on ceramics for applications in turbine engines\, rocket engines\, hot structures for thermal protections systems\, and other power and propulsion applications. \; Her current research focus inclu des understanding thermodynamic and kinetic mechanisms for material degrada tion in extreme environments\, development of life prediction methodology b ased on understanding of fundamental high temperature chemical reaction mec hanisms\, and materials development for protection of materials from extrem e environments. \; \; Prof. Opila received her BS in Ceramic Engine ering from the University of Illinois\, her MS in Materials Science from th e University of California Berkeley\, and her PhD in Materials Science from the Massachusetts Institute of Technology. \; She is Fellow of the Ame rican Ceramic Society and the Electrochemical Society and recipient of the 2021 American Ceramic Society’s Arthur L. Friedberg Award. \; She has o ver 130 publications\, is editor of 10 proceedings volumes\, and coinventor on six patents. \;

    LAST-MODIFIED:20220207T151746Z LOCATION:2110 CHE\, Virtual attendance is also available via Zoom for those who are unable to attend. Please send an email to Sherri Tatum @ statum12@ umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T171500Z DTEND:20220405T181500Z DTSTAMP:20260828T094430Z UID:46u9uq7c7ni68ijd3t0nk23ll2@google.com CREATED:20220207T155226Z DESCRIPTION:Speaker: Professor Joel Yuen-Zh ou\, University of California San Diego - \;http://yuenzhougroup.ucsd.edu/

    Title: Unusual Ligh t-molecule Interactions: Polariton Condensates and other Nonlinear Phenomen a

    Abstract: \;    Confinement of molecules in optical microcavities gives rise to collective strong light-matter coup ling and the formation of hybrid light-matter modes known as polaritons. Wh ile these modes potentially offer unusual chemical reactivity\, their use i s limited by their very short lifetimes owing to an entropic flow of popula tion into the so-called dark modes. However\, past a certain threshold of o ptical pumping\, the population of polariton modes can become self-catalyti c\, giving rise to a nonequilibrium version of Bose-Einstein condensation. Polariton condensation has been routinely demonstrated with organic dyes at room temperature since the last decade. I will provide a chemical outlook for these condensates\, demonstrating that their photochemical reactivity c an be rather rich and different from plain laser-driven molecules. \;&n bsp\;

    In the second part of my talk\, I will discuss interestin g connections between topological phases of matter and chiroptical spectros copy of molecules\, describing a scheme to distinguish molecular enantiomer s using the recently introduced ideas of topological frequency conversion.< /p>


    LAST-MODIFIED:20220331T134905Z LOCATION:IPST Building\, 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T150000Z DTEND:20211104T163000Z DTSTAMP:20260828T094430Z UID:2r4mc1fggbqpnk2eae646kpse4@google.com CREATED:20210831T190248Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Zohongbo Kang \, UCLA

    Title: Quantum 3D imaging of hadrons

    Abstract:
    The transverse momentum dependent (TMD) parton distribution functions (PDFs) a nd fragmentation functions (FFs) have received great attention from both th eoretical and experimental communities in recent years. These TMD PDFs and FFs\, or in short called TMDs\, provide new information on hadron structure : the three-dimensional (3D) imaging of hadrons in both longitudinal and tr ansverse momentum space\, which is also one of the scientific pillars for t he future Electron Ion Collider. In this talk\, I will review the recent pr ogress in the study of the TMDs. That includes the study in the traditional processes such as semi-inclusive deep inelastic scattering\, Drell-Yan pro duction\, and e+e- collisions\, as well as some recent excitement in utiliz ing jets for 3D imaging. Our toolbox includes new developments such as jet charge for flavor separation\, polarized jet fragmentation functions\, etc.  \; LAST-MODIFIED:20211104T151258Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210427T160000 DTEND;TZID=America/New_York:20210427T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210427T160000 CREATED:20200116T204737Z DESCRIPTION:RECORDING LINK
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=b3eed653-1b9d-4aea-ad17-ad170168141d

    Zoom Link :
    https://umd.zoom.us/j/91263501883?pwd=dEMvYk9HWk5XNERCTExWQ2tyT kNNUT09

    Meeting ID: 912 6350 1883
    Passcode: 788984

    Spe aker: Dmitry Pushin\, IQC Waterloo


    Title: \;Applicati ons of structured matter and light waves

    Abstract: \;Since the ir experimental demonstrations a quarter-century ago there has been great p rogress in the generation\, detection\, and applications of \;“structur ed waves” \;of light and quantum particles\, where the wavefront is pat terned to attain nontrivial propagation characteristics such as orbital ang ular momentum (OAM)\, nondiffraction\, and self-healing. The structured OAM light waves have demonstrated a number of applications in microscopy\, enc oding and multiplexing of communications\, and manipulation of matter. In t his talk\, I will cover some recent advances in the preparation and applica tion of spin coupled OAM beams\, for both neutrons and light. In the case o f light\, we are exploring a unique application of retinal imaging and dete ction of age-related macular degeneration. In the case of neutrons\, we loo k at probing emerging quantum materials with interesting topological featur es.


    Host: Charles W Clark LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210301T213000Z DTEND:20210301T221500Z DTSTAMP:20260828T094430Z UID:7hlor5bbmsvkhhcgkafsbae82e@google.com CREATED:20210219T174908Z DESCRIPTION:Title: The TeV Cosmic Ray Bump: a Message from Epsilon Indi or Epsilon Eridani Star?

    Speaker: Mikhail Malkov\, University Californi a of San Diego

    Abstract:  \;A recently observed bump in the cosm ic ray (CR) spectrum from 0.3-30 TV is likely \;caused by a stellar bow shock that reaccelerates preexisting  \;CRs\, which \;further prop agate to the Sun along the magnetic field lines.  \;Along their way\, t hese particles generate an Iroshnikov-Kraichnan (I-K) turbulence that contr ols their propagation and sustains the bump. Ad hoc fitting of the bump sha pe requires six adjustable parameters. Our model requires none\, merely dep ending on three physical unknowns that we constrain using the fit. These ar e the shock Mach number\, M\, its size\, lperp\, and the distance to it Zob s...
    &l t\;full abstract at https://space.umd.edu/seminars/showAbstract/0301211630& gt\;

    Visit https://bit.ly/2PmJo T6 for access LAST-MODIFIED:20210223T141546Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T193000Z DTEND:20220427T203000Z DTSTAMP:20260828T094430Z UID:3o96rip2q9gvpp583e7ur3mq3s@google.com CREATED:20220421T211655Z DESCRIPTION:
    Quantum Characterization and Control: Theory\, Practice and Potential
     \;
    Jonathan L DuBois\, Ph. D. will present an overview of some recent work from Quantum Coherent Device Physics Group foc used on open and closed-loop feedback control of superconducting qubits.
     \;
    Bio: \;Dr. DuBois received a PhD in computati onal condensed matter theory in 2003 from the University of Delaware. His r esearch interests range from Computational condensed matter physics and qua ntum systems architecture and application co-design to quantum optimal cont rol and hybrid quantum-classical algorithm development. He currently leads the Quantum Coherent Device Physics Group at Lawrence Livermore National La b.
     \;

     \;
     \;
     \;


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    LAST-MODIFIED:20220421T211655Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS 2021-22 Seminar Series: Dr. Jonathan Dubois on Quantum Characte rization and Control: Theory\, Practice and Potential TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211001T170000Z DTEND:20211001T180000Z DTSTAMP:20260828T094430Z UID:25bemrp8dur1864f6nis1hpfli@google.com CREATED:20210914T145516Z LAST-MODIFIED:20210924T202951Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220324T180000Z DTEND:20220324T193000Z DTSTAMP:20260828T094430Z UID:5icbi41gg5g5r20mqiplpd0oum@google.com CREATED:20220323T223252Z DESCRIPTION:

    Title: \;Magnetism in moirésuperlattices

    Abstract: Moiré superlattices of 2Dmaterials is an emerging platform for studying new physical phenomena with high tunab lity. In this talk\, I will present emergent magnetic interactions in two d istinct types of moiré superlattices. I will firstly present the observatio n of magnetic textures in small angle twisted 2D magnet chromium triiodide (CrI3).Employing single-spin quantum magnetometry\, we directly visualize n anoscale magnetic domains and periodic patterns\, a signature of moiré magn etism\, and gain quantitative information on domain size and magnetization. The observed AFM and FM domains with periodic patterns are in good agreeme nt with the calculated spatial magnetic structures arising from the local s tacking-dependent interlayer exchange interactions in CrI3 moiré superlatti ces. Then I will present the drastic tuning of spin-spin exchange interacti ons in WSe2/WS2 moiré superlattices by optical excitation\, which results i n ferromagnetic order over a small range of doping at elevated temperatures . This discovery adds a new and dynamic tuning knob to the rich many-body H amiltonian of moiré quantum matter.


    Host: You Zhou
     \;
    Seminar on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

     LAST-MODIFIED:20220323T224725Z LOCATION:ZOOM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Xiaodong Xu\, UW Seattle (ZOOM) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220216T140000Z DTEND:20220216T151500Z DTSTAMP:20260828T094430Z UID:14da3mqgnp2kqm9mhv1lk46qp5@google.com CREATED:20220211T212843Z DESCRIPTION:Title: Photonic quantum computational advantage\nSpeaker: Chao -Yang Lu (USTC\, Hefei)\nTime: Wednesday\, February 16\, 2022 - 9:00am\nLoc ation: Virtual Via Zoom: https://umd.zoom.us/j/99289699443 Meeting ID: 992 8969 9443\n\nThe main challenge for scaling up photonic quantum technologie s is the lack of perfect quantum light sources. We have pushed the parametr ic down-conversion to its physical limit and produce two-photon source with simultaneously a collection efficiency of 97% and an indistinguishability of 96% between independent photons. Using a single quantum dot in microcavi ties\, we have produced on-demand single photons with high purity (>99%)\, near-unity indistinguishability\, and high extraction efficiency—all combin ed in a single device compatibly and simultaneously. Based on the high-perf ormance quantum light sources\, we have implemented boson sampling—which is an intermediate model of quantum computing\, a strong candidate for demons trating quantum computational advantage and refuting Extended Church Turing Thesis—with up to 113 photon clicks after a 144-mode interferometer. The p hotonic quantum computer\, Jiuzhang\, yields an output state space dimensio n of 10^43 and a sampling rate that is 10^24 faster using the state-of-the- art simulation strategy on supercomputers.\n\n(Please note the earlier star t time of 9:00 a.m. for this seminar.) LAST-MODIFIED:20220211T212843Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/99289699443 Meeting ID: 99 2 8969 9443 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Chao-Yang Lu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211007T150000Z DTEND:20211007T163000Z DTSTAMP:20260828T094430Z UID:3rb31lh8a2mdv0oiua5e6ndd69@google.com CREATED:20210831T185815Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Gurtej Kanwar\, MIT /Bern

    Title: Observifolds: Taming the observable signal-to-noise pro blem via path integral contour deformations


    Abstract: Contour de formations of the path integral have been shown to mitigate sign problems a ssociated with non-zero chemical potential and real-time evolution in latti ce field theories. This talk details recent extensions to observables affec ted by signal-to-noise problems in theories with real actions. Contour defo rmations allow redefining observables without affecting their expectation v alue or modifying the Monte Carlo sampling weights\, while their variance c an be optimized to maximize the signal-to-noise ratio. We define families o f contour deformations for SU(N) variables and demonstrate exponential impr ovements in the signal-to-noise ratio of Wilson loops in proof-of-principle applications to U(1) and SU(N) lattice gauge theories. LAST-MODIFIED:20211004T135008Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210416T170000Z DTEND:20210416T180000Z DTSTAMP:20260828T094430Z UID:4av7k19vo6nci7t3dchnc33j9t@google.com CREATED:20210202T141422Z DESCRIPTION:Speaker: \;Linda F. Nazar\, \;University Professor &\; Canada Research Chair in Solid State Energy MaterialsUniversity of Waterlo o

    Title: \;Understanding and Enhancing Li-Ion Transport in Solid s and at Interfaces for All-Solid­State Electrochemical Energy Storage  \;

    Abstract: All-solid-state lithium-ion batteries (ASSBs) have emer ged as exc1tmg alternatives to conventional liquid electrolyte cells for el ectrochemical energy storage\, owing to their enhanced safety and higher en ergy densities. ASSBs are founded on high performance fast-ion conducting e lectrolytes\, where the search for new crystalline and glassy materials mat erials hinges on understanding their intrinsic nature. Currently\, a compre hensive knowledge of the factors that dictate facile Li-ion transport remai ns elusive\, as does mastering the interface of the solid electrolyte with the electrode materials.
    The seminar will cover an overview of the state -of-the art in the field\, followed by a focus on recent findings in our la boratory based on neutron scattering that are complemented by analysis usin g the maximum entropy method\, ab initio molecular dynamics simulations and solid-state NMR studies. We correlate structure with ionic conductivity in a range of newly developed fast ion Li conductors to understand how cation disorder and a frustrated energy landscape impacts conductivity and activa tion energy. These considerations lead to an overarching understanding for design concepts for ion transport and electrolyte-electrode interfaces in s olid state batteries\, which serves as the theme of the presentation. Trans lation of our findings to high performance practical solid-state batteries whose high performance exceeds that of their liquid electrolyte counterpart s will be introduced at the end.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \; LAST-MODIFIED:20210329T210307Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210430T170000Z DTEND:20210430T180000Z DTSTAMP:20260828T094430Z UID:24r2ua3sandd072og8mvt96ur1@google.com CREATED:20210202T141827Z DESCRIPTION:Speaker: \;Jonathan D. Madison\, Ph.D.\, \;Principal R&\;D Scie ntist (Materials) \;Sandia National Laboratories

    Title: \;Fr om Fundamental Research to Engineered Components: Application to 3D Materia ls Science

    Abstract: Three-dimensional materials science (3DMS) has become a burgeoning field providing unique and novel insights to a myriad o f materials issues ranging from kinetics of solidification\, evaluation of complex microstructures\, in-situ observation of response\, and even post-m ortem failure analysis. While largely exploratory in the early 2000s\, two decades of development have provided much in advancing experimental hardwar e\, software packages and overall computational power. These developments h ave reduced both the barrier to entry and many previous limitations. Using a RoboMET.3DÔ\, Sandia National Laboratories has advanced much of its 3DMS investigations from fundamental research to pressing concerns in engineered components. To illustrate\, examples of new insights\, failure mode discov eries and lot-to-lot variations in singular material systems and engineered multi-material assemblies\, as obtained via three-dimensional reconstructi on\, will be provided. Additionally\, a few observations regarding error es timation and the impact of image segmentation decisions on final results wi ll also be highlighted.

    via Zoom
    Sherri Tatum
    statum12@umd.edu
    https://mse.umd.edu/seminar-series \; LAST-MODIFIED:20210329T210730Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T173000Z DTEND:20210910T183000Z DTSTAMP:20260828T094430Z UID:4loe9q0b7q8c7u6v4kr6lftrol@google.com CREATED:20210816T144315Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Andreas K arch\, University of Texas\, Austin

    Seminar will be conducted via zo om

    Preceded by zoom lunch at 12:30pm.

    Title: "Branes\, Islands\, and Massive Gravitons"

    Abstract: Recent progress in our understanding of black hole evaporatio n has mostly occurred in the context of black holes coupled to an external\ , non-gravitating bath. In order to compare and contrast to what happens to black holes in asymptotically flat space it is imperative to understand wh ether the non-gravitating bath is just some external spectator or actively changes the physics of the system. We show how Randall-Sundrum braneworlds\ , and their holographic interpretation\, provide us with the tools to answe r this important question.

    Seminar Slides LAST-MODIFIED:20210913T184241Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210412T200000Z DTEND:20210412T213000Z DTSTAMP:20260828T094430Z UID:0r99kk2gvdd792v9n2n3klbrtv@google.com CREATED:20210225T112429Z DESCRIPTION:Speaker: John Collini\, UMD\n\nTitle: Evolving Charge Order in a Tunable Electronic Nematic Superconducting System\n\nAbstract: Recent di scoveries of charge order in the cuprates and electron nematic order in the iron-based superconductors has pointed towards the possibilities of both o rderings being tied to mechanisms of high Tc superconductivity.The (Ba\,Sr) Ni2As2 system\, closely related in structure to the BaFe2As2 system\, has b een shown to exhibit both types of ordering without the presence of any mag netic order. We report single crystal X-ray diffraction observations that s how previously the reported unidirectional charge order of (0.27\,0\,0) in BaNi2As2 decays and vanishes by x=0.65. We also show that the (0.33\,0\,0) evolves into a (0\,0.5\,0) charge order before vanishing at x=0.71. The evo lution of the charge order in this system correlates well with the already reported evolutions of nematicity and superconducivity\, suggesting a stron g link between the three phases\n\nAdvisor: Paglione\n\n\nJoin Zoom Meeting \nhttps://umd.zoom.us/j/96975735470?pwd=V3lPTkdYTHRCTU5UcHlWTThtcEZSdz09\n\ nMeeting ID: 969 7573 5470\nPasscode: 005596 LAST-MODIFIED:20210225T112429Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: John Collini\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210903T160000Z DTEND:20210903T164500Z DTSTAMP:20260828T094430Z UID:4jqt5kkeeugpr3q2b3lbh2e2nl@google.com CREATED:20210828T013824Z DESCRIPTION:Title: Overview of quantum research at UMD
    Speaker: Victor Albert (QuICS)
    Time: Friday\, September 3\, 2021 - 12:00pm
    Location: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207

    This short talk provides a sna pshot of opportunities in quantum science\, technology\, engineering\, and mathematics (qSTEM) at the University of Maryland College Park (UMD). The U MD quantum ecosystem consists of seven quantum institutes\, five quantum-ad jacent institutes\, and approximately 100 faculty\, split 55/45 between the ory and experiment. I organize the ecosystem into subfields: each subfield is described\, and its corresponding faculty is listed.


    Pizza a nd drinks served after the talk. This talk will start at 12:10 p.m. LAST-MODIFIED:20210902T121914Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210426T203000Z DTEND:20210426T213000Z DTSTAMP:20260828T094430Z UID:6s4rkn5dum51sgkhu4u8dg1ibm@google.com CREATED:20210421T153757Z DESCRIPTION:Title: The latest low energy results from the Alpha Magnetic Sp ectrometer (AMS) on the International Space Station

    Speaker: Veronic a Bindi\, University of Hawaii at Manoa

    Abstract: The Alpha Magnetic Spectrometer (AMS)\, on the International Space Station since May 2011\, h as acquired the largest number of particles ever measured in space by a sin gle experiment\, performing the most precise measurement of galactic cosmic rays (GCR) to-date. A series of 4 very complicated EVAs extended the lifet ime of the instrument and allow the taking of data for the entire lifetime of the space station. The detailed time variation of multiple particle spec ies of GCR fluxes\, measured during solar cycle 24\, will be presented toge ther with results on short-term solar activity\, including Forbush decrease s (FDs) and solar energetic particles (SEPs). These results provide an inva luable resource for understanding the space radiation environment for futur e manned missions to the Moon and Mars\, and for improving space weather fo recasting capabilities.

    Notes: Visit \;https://bit.ly/2PmJoT6 \;for access.  \;Join at 4:15PM for meet &\; greet LAST-MODIFIED:20210421T153757Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201110T160000 DTEND;TZID=America/New_York:20201110T170000 DTSTAMP:20260828T094430Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201110T160000 CREATED:20200116T204737Z DESCRIPTION:
    Start Time : \;Nov 10\, 2020 03:47 PM

    Meeting Recording:
    https://umd.zoom.us/rec/share/KlQqN8E_dDqQFL8TQ38Jdkc6uD ACigWSMxyjeJhzp75nSBYLw_gtWo6kbQXCKA_0.YC8DlhhXDMARAESq

    Access Pa sscode: 43x#VjWq

    Speaker
    Professor Ellen Williams
    U niversity of Maryland

    Sc ience meets Politics: The status of clean energy innovation in Maryland&nbs p\;
     \;Zoom Meeting: \;https://umd.zoom.us/< /u>j/99744220412?pwd=bzlIM0JSSjJvOTN2c2Y1OVA3Y1Jkdz09

    Meeting ID: 997 4422 0412 \;  \;Passcode: 89593
    Host: Dr. Steve Rolston LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210901T150000Z DTEND:20210901T160000Z DTSTAMP:20260828T094430Z UID:4rrn1rj66gds25rjnvupse7rce@google.com CREATED:20210826T190528Z DESCRIPTION:Speaker: Stefanie Milam\, NASA\, GSFC

    Title: Probing the Formation of Complex Organics in Cometary Ices: A New Laboratory Approach< br>
    Abstract: Web: \;https://science.gsfc.nasa.go v/sed/bio/stefanie.n.milam LAST-MODIFIED:20210831T140021Z LOCATION:IPST Bldg.\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220615T150000Z DTEND:20220615T160000Z DTSTAMP:20260828T094430Z UID:4usv2sp3jrpi9uo6mn0vq0hmm2@google.com CREATED:20220615T144117Z DESCRIPTION:Title: Describing so lutions to QMA problems
    Speaker: Chinmay Nirkhe (UC Berkeley)
    Time: Wednesday\, June 15\, 2022 - 11:00am
    Location: ATL 3100A and Virtual V ia Zoom:  https://umd.zoom.us/j/968456988 94    Meeting ID: 968 4569 8894

    In this talk\, I'\;ll motivat e studying the complexity of quantum states and transformations. I'\;ll discuss how this general study is related to a seminal theoretical computer science concept: search vs. decision. I'\;ll show how to construct a fo rm of search-to-decision reductions for QMA problems and show why it is unl ikely that we can do (much) better. I'\;ll conclude by discussing a para metrized notion of QMA and the notion of QMA solutions in this context.

    This talk will be based on a work with Irani\, Natarajan\, Rao and Yuen (https://arxiv.org/abs/2111.02999) an d a work with Arunachalam\, Bravyi\, and O'\;Gorman (https://arxiv.org/abs/2202.08119).

    < u>
    Join Zoom Meeting
    https://um d.zoom.us/j/96845698894

    Meeting ID: 968 4569 8894
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    Meeting ID: 968 4569 8894
    LAST-MODIFIED:20220615T144117Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96845698894 Meeting ID: 968 4569 8894 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Chinmay Nirkhe TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220913T170000Z DTEND:20220913T183000Z DTSTAMP:20260828T094430Z UID:4vouaurobe60vc1tkf4rh43g7u@google.com CREATED:20220907T155213Z DESCRIPTION:Speaker: Professor Juan Garrahan\, University of Not tingham

    Title: Tensor Network Methods and Lar ge Deviations

    Abstract: I will describe the a pplication of tensor networks for the study of dynamical fluctuations in sy stems with stochastic dynamics. I will discuss several related questions: ( i) how to obtain the long-time statistics\, i.e. the large deviations\, of trajectory observables from tilted Markov generators (in analogy with findi ng quantum ground states)\; (ii) how to exploit these methods to efficientl y sample rare events\; (iii) how to extend this approach to finite time tra jectories (in analogy with calculating quantum partition sums)\; (iv) the e mergence of symmetry protected topological phases in atypical dynamics. LAST-MODIFIED:20220908T133719Z LOCATION:Virtual - https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210929T150000Z DTEND:20210929T161500Z DTSTAMP:20260828T094430Z UID:0ka4sqra06nli4odfoi7p2c0fe@google.com CREATED:20210921T152026Z DESCRIPTION:Title: Improved quantum error correction using soft informatio n
    Speaker: Nicolas Delfosse (Microsoft)
    Time: Wednesday\, September 29\, 2021 - 11:00am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/96330035092

    The typi cal model for measurement noise in quantum error correction is to randomly flip the binary measurement outcome. In experiments\, measurements yield mu ch richer information - e.g.\, continuous current values\, discrete photon counts - which is then mapped into binary outcomes by discarding some of th is information. In this work\, we consider methods to incorporate all of th is richer information\, typically called soft information\, into the decodi ng of the surface code. We design soft decoders that leverage soft informat ion\, and demonstrate that these soft decoders outperform the standard (har d) decoders that can only access the binary measurement outcomes. We also i ntroduce a soft measurement error model with amplitude damping\, in which m easurement time leads to a trade-off between measurement resolution and add itional disturbance of the qubits. Under this model we observe that the per formance of the surface code is very sensitive to the choice of the measure ment time - for a distance-19 surface code\, a five-fold increase in measur ement time can lead to a thousand-fold increase in logical error rate. More over\, the measurement time that minimizes the physical error rate is disti nct from the one that minimizes the logical performance\, pointing to the b enefits of jointly optimizing the physical and quantum error correction lay ers.
    Based on joint work with Christopher Pattison\, Michael Beverland a nd Marcus da Silva.
    https://a rxiv.org/abs/2107.13589 LAST-MODIFIED:20210921T152646Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Nicolas Delfosse TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T193000Z DTEND:20211020T203000Z DTSTAMP:20260828T094430Z UID:2310lfmdfcsnns80jl5g3rbn2n@google.com CREATED:20211013T144826Z DESCRIPTION:Title : Normal Forms and Near-Axis Expansions for Beltrami Magn etic Fields

    Speaker Name: Nathan Duignan
    Speaker Institution : Un iversity of Colorado

    Abstract : The structure of magnetic fields nea r the axis of a toroidal confinement device is known from the classical wor ks of Solov'ev and Shafranov\, and Lortz and Nuhrenberg in the 1970s. In th ese classic studies\, as well as more recent work\, it is conventional to a ssume the existence of magnetic surfaces\, as would be guaranteed by the ma gnetostatics equation $J \\times B = \\nabla p$\, or to assume non-resonanc e of the axis. In this seminar\, we revisit this calculation\, without maki ng the assumption of local surfaces or of non-resonance. Utilising the Hami ltonian nature of magnetic fields\, we demonstrate how to construct normal form coordinates near the axis. The normal form coordinates are analogous t o magnetic coordinates\, such as Boozer and Hamada coordinates\, however\, they can be defined regardless of the existence of magnetic surfaces. Moreo ver\, we will see how they can be used to construct approximate magnetic su rfaces near or at resonance. Vacuum and Beltrami (force-free) magnetic fiel ds will be treated\, although the techniques hold more generally.

    Ho st: Marc Swisdak
    Host E-Mail: \;swi sdak@umd.edu LAST-MODIFIED:20211013T144826Z LOCATION:Contact Marc Swisdak (swisdak@umd.edu) for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210610T130000Z DTEND:20210610T140000Z DTSTAMP:20260828T094430Z UID:5ih8edo1kod5sm6g85huh7591j@google.com CREATED:20210419T155605Z DESCRIPTION:Four lectures on important issues of our time. Victor Yakovenko will speak on June 24.

    https://aub.edu.lb/fas/physics/Pages/public_pol icy.aspx

     \;

    Registration Link

    ​https://zoom.us/j/97858100666?pwd=Q2RwTmdYc0ZNNjlIdnQr bTdFNkgvQT09​


    ​Meetin g ID: 978 5810 0666

    Passcode: 037532

    ​  \; LAST-MODIFIED:20210419T155948Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics and Public Policy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T150000Z DTEND:20220427T160000Z DTSTAMP:20260828T094430Z UID:3thghn78cf1p3kn5trquv2rq3k@google.com CREATED:20220207T181143Z DESCRIPTION:Speaker: Dr. Mark Johnson\, Yale University

    T itle: Unraveling the Spectral Dynamics of the Air-Water Interface at the Mo lecular Level with Cryogenic Ion Spectroscopy

    Abstract: \;https://chem.umd.edu/e vents/speaker-mark-johnson     LAST-MODIFIED:20220426T142642Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221005T150000Z DTEND:20221005T160000Z DTSTAMP:20260828T094430Z UID:5g778sekqeu8mm669vm675u1k6@google.com CREATED:20220826T140138Z DESCRIPTION:Speaker: Dr. José Aponte\, NASA Goddar d

    Title: \;Organic Astrochemistry 101: Meteorites and the Origins of Life on Earth

    Abstract: \;Carbonaceous chondr ites (carbon-rich meteorites) represent some the oldest and most primitive pieces of material formed in the Solar System\; indeed\, they could even be older than the Sun itself. These carbon-rich meteorites may have delivered an important concentration of organic compounds and water to the primitive Earth. Multiple organic classes\, including those required for life (e.g. amino acids\, carboxylic acids\, nucleobases and polyols) have been identif ied from carbonaceous chondrites\, providing valuable insights into the che mical inventory of the early Solar System\, the primordial synthesis of org anic matter\, and the question of how life appeared on Earth.
     \; &n bsp\;  \;  \;  \;  \;  \;  \; Amino acids constitut e the basic building blocks of all protein-based living organisms on Earth and thus\, they are among the most intriguing and studied meteoritic organi c compounds found. Homochirality (predominance of the L enantiomer) in terr estrial biological proteins is a fundamental feature of life as we know it. L-enantiomeric excesses have been observed in some meteoritic amino acids\ , raising interesting questions about a potential link between meteorites a nd terrestrial homochirality. In addition\, the stable isotopic composition s (D\, 13C\, 15N) of meteoritic organic compounds provide information on th eir formation mechanisms and histories. Contrasting the distribution\, chir ality and isotopic composition of meteoritic organic compounds in a wide ra nge of carbonaceous chondrites provide important insights on the compositio n and environments of the protosolar nebula\, the meteorite parent bodies\, and may well provide clues about their synthesis and survival during the f ormation of our Solar System.
     \;  \;  \;  \;  \; &n bsp\;  \;  \;  \;I will present results from our extensive inve stigation on the abundance and molecular distribution of amino acids\, and other biologically relevant molecules extracted from meteorites. We will di scuss their potential prebiotic origins and relevance to the emergence of l ife on Earth. We will also review the importance or sample return missions and our future findings after the analysis of asteroid samples brought to t he Earth by JAXA’s Hayabusa2 (December 6\, 2020) and NASA’s OSIRIS REx (Sep tember 24\, 2023). \; \;     LAST-MODIFIED:20221004T142851Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120308T173000Z DTEND:20120308T183000Z DTSTAMP:20260828T094430Z UID:69h4q783o2kd50svs32n9vq8jo@google.com CREATED:20120224T151802Z DESCRIPTION:"Adapting Swarm Intelligence for the Self-Assembly and Optimiza tion of Networks"\nCharles E. Martin\nUniversity of Maryland\, Dept. of App lied Mathematics and Scientific Computing LAST-MODIFIED:20230127T203712Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221004T150000Z DTEND:20221004T160000Z DTSTAMP:20260828T094430Z UID:78fa94ot7n5op5gl9lark2khtb@google.com CREATED:20220921T184531Z DESCRIPTION:When: October 4th at 11am
    Where: ATL 4402
    < b>Speaker    : Dr. Yahui Zhang
    Title: \;Exotic exciton phases and quantum spin liquids in quantum Hall bilayer and moire bilayer
    < /u>Abstract: \;In this talk I will discuss some exoti c phases of excitons beyond the conventional exciton condensation phase. &n bsp\;  \;(1) In the first part\, I will consider a coulomb coupled quan tum Hall bilayer at filling (1/3\,-1/3). (Equivalently (1/3\,2/3)) and then tune d/l_b.  \;d is inter-layer distance and l_B is magnetic length. & nbsp\;I propose that there is a continuous quantum phase transition between an exciton condensation phase at small d and the decoupled Laughlin state at large d.  \;The transition is driven by condensation of a fractional exciton formed by anyone with 1/3 and -1/3 charges in the two layers. This critical point is in the universality class of XY*.  \; (2) In the sec ond part\,  \;I consider a moire bilayer and use the layer pseudo-spin to simulate spin physics. “Magnon” of this pseudo spin is just the inter-la yer exciton discussed in the first part. Similar to quantum Hall bilayer\, conductivity of this pseudo-spin  \; can be electrically measured throu gh the counter-flow techniques. Thus one may obtain smoking gun evidences o f certain quantum spin liquids. I will provide some examples of quantum spi n liquids which may be realized in this system\, including chiral spin liqu id\, Z2 spin liquid and spinon Fermi surface. \; \; LAST-MODIFIED:20220921T184643Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110125T163000Z DTEND:20110125T180000Z DTSTAMP:20260828T094430Z UID:6tg4nj7fc837dof6rjkj4b2cj0@google.com CREATED:20110119T153809Z DESCRIPTION:SPEAKER: Thomas Kelley - Univ of Minnesota\n\nTITLE: The Ther modynamics of a 5D-Gravity-Dilaton-Tachuon Solution\n\nABSTRACT: RHIC and now the LHC have conducted heavy-ion collisions. Such collisions create the so-called quark-gluon plasma (QGP). All data suggests that the QGP is stro ngly coupled\, allowing gauge-gravity duality techniques to be applied to t he system. I explore a 5-dimensional\, soft-wall\, finite-temperature\, hol ographic model that describes thermal properties of the QGP. I also explore the possibility that this model yields a transition temperature. LAST-MODIFIED:20230127T203245Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221025T160000Z DTEND:20221025T170000Z DTSTAMP:20260828T094430Z UID:0sd3oo0aq44r0ekknbq14k8oe8@google.com CREATED:20220920T114231Z LAST-MODIFIED:20220920T114231Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131024T173000Z DTEND:20131024T180000Z DTSTAMP:20260828T094430Z UID:7jbshognhfukh4o0a5cuv9136g@google.com CREATED:20131022T191343Z LAST-MODIFIED:20230127T203631Z LOCATION:Phys room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131111T210000Z DTEND:20131111T223000Z DTSTAMP:20260828T094430Z UID:ohl9jln8bhgon615tc09mkrb3o@google.com CREATED:20131105T143719Z DESCRIPTION:Title : System-Level Reconstruction of Developments with Light- Sheet Microscopy.\n\nSpeaker Name: Phillip Keller\n\nSpeaker Institution : Janelia Farm Research Campus (HHMI)\n\nNotes: *Refreshments at 3:45pm\n LAST-MODIFIED:20230127T203639Z LOCATION:Room 0112\, Chemistry Bldg. (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081031T190000Z DTEND:20081031T200000Z DTSTAMP:20260828T094430Z UID:t4pfq0tetpaq7g6csnear152ig@google.com CREATED:20081029T150620Z DESCRIPTION:Speaker: Characterizing Noise in Hospitals\nTitle: James E. Wes t\, Johns Hopkins University LAST-MODIFIED:20230127T203402Z LOCATION:A.V. Williams Building\, Room 3258 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100923T161500Z DTEND:20100923T171500Z DTSTAMP:20260828T094430Z UID:jl7no3jq3gsj4pb745uc8gmavk@google.com CREATED:20100916T175918Z DESCRIPTION:Speaker: Dr. Thomas Carroll\nNaval Research Laboratory\nTitle: Nonlinear Dynamics for Target Recognition LAST-MODIFIED:20230127T202939Z LOCATION:REAP Conference Room (ERF 1207) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101020T191500Z DTEND:20101020T201500Z DTSTAMP:20260828T094430Z UID:9hp5b0r35jl4svcbl0l43fbb1o@google.com CREATED:20101008T174344Z DESCRIPTION:[Title] "Background independent spin systems as toy models for emergent gravity"\n[Speaker] Fotini Markopoulou\n[Institution] Max Planck I nstitute for Gravitational Physics (Albert Einstein Institute) \n[Abstract] A number of recent proposals for a quantum theory of gravity are based \n on the idea that spacetime geometry and gravity are emergent concepts that only apply at an approximate level. There are two fundamental challenges to any such approach. At the conceptual level\, there is a clash between th e "timelessness" of general relativity and emergence. Second\, the lack of a fundamental spacetime makes difficult the straightforward application of well-known methods of statistical physics to the problem. We initiate a s tudy of such problems using toy models for emergent geometry and gravity as ed on evolution of quantum networks with no a priori geometric notions.\n\n In this talk we present two models. The first is a model of emergent (fla t) space and matter and we show how to use methods from quantum information theory to derive features such as speed of light from a non-geometric quan tum system. The second model exhibits interacting matter and geometry\, wi th the geometry defined by the behavior of matter. We find that it has pri mitive notions of gravitational attraction and show entanglement between th e matter and the geometry degrees of freedom.\n\n LAST-MODIFIED:20230127T203421Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110414T113000 DTEND;TZID=America/New_York:20110414T123000 DTSTAMP:20260828T094430Z UID:tccpsv8eudbavhddlpmpkul6rk@google.com RECURRENCE-ID;TZID=America/New_York:20110414T113000 CREATED:20110317T150721Z DESCRIPTION:Topic: "Axion Dark Matter Detection with Cold Molecules" \nPape r Ref.: arXiv:1101.2691\nPresenter: Surjeet Rajendran (Johns Hopkins)\nAbst ract:Current techniques cannot detect axion dark matter over much of its pa rameter space\, particularly in the theoretically well-motivated region whe re the axion decay constant f_a lies near the GUT and Planck scales. We sug gest a novel experimental method to search for QCD axion dark matter in thi s region. The axion field oscillates at a frequency equal to its mass when it is a component of dark matter. These oscillations induce time varying CP -odd nuclear moments\, such as electric dipole and Schiff moments. The coup ling between internal atomic fields and these nuclear moments gives rise to time varying shifts to atomic energy levels. These effects can be enhanced by using elements with large Schiff moments such as the light Actinides\, and states with large spontaneous parity violation\, such as molecules in a background electric field. The energy level shift in such a molecule can b e ~ 10^-24 eV or larger. While challenging\, this energy shift may be obser vable in a molecular clock configuration with technology presently under de velopment. The detectability of this energy shift is enhanced by the fact t hat it is a time varying shift whose oscillation frequency is set by fundam ental physics and is therefore independent of the details of the experiment . This signal is most easily observed in the sub-MHz range\, allowing detec tion when f_a is > 10^16 GeV\, and possibly as low as 10^15 GeV. A discover y in such an experiment would not only reveal the nature of dark matter and confirm the axion as the solution to the strong CP problem\, it would also provide a glimpse of physics at the highest energy scales\, far beyond wha t can be directly probed in the laboratory. LAST-MODIFIED:20230127T203703Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221129T160000 DTEND;TZID=America/New_York:20221129T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221129T160000 CREATED:20210423T130624Z DESCRIPTION:


    Jordan Horowitz\, Univer sity of Michigan

    Nonequilibrium thermodynamic limit s to fluctuations and response

    Thermodynamics is a remarkably su ccessful theoretical framework\, with wide ranging applications across the natural sciences. However\, thermodynamics is limited to equilibrium or nea r-equilibrium situations\, whereas most of the natural world\, especially l ife\, operates very far from equilibrium. Research in nonequilibrium statis tical thermodynamics is beginning to shed light on this domain. In this tal k\, I will present two such recent predictions. The first is a bound that q uantifies how dissipation shapes fluctuations far from equilibrium. Besides its intrinsic allure as a universal relation\, I will discuss one possible application where it offers insight into optimal heat engine design. \ ; \;The second is a series of equalities and inequalities---akin to the Fluctuation-Dissipation theorem but valid arbitrarily far from equilibrium ---that link a system’s sensitivity to the strength of nonequilibrium drivi ng. \; \;I will discuss how these predictions rationalize known ene rgetic requirements of some common biochemical motifs.

    LAST-MODIFIED:20221117T164515Z LOCATION:1410 Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130131T203000Z DTEND:20130131T213000Z DTSTAMP:20260828T094430Z UID:loa0u9m0mt4m2745f7jjrrsftc@google.com CREATED:20130122T150439Z DESCRIPTION:Speaker: Prof. Razvan Fetecau\, Department of Pure Mathematics and Mathematical Statistics\, University of Cambridge\n\nTitle: Swarm dynam ics and equilibria for a nonlocal aggregation model\n\nAbstract: We conside r the aggregation equation ρt − ∇ • (ρ∇K ∗ ρ) = 0 in Rn\, where the interac tion potential K models short-range repulsion and long-range attraction. We study a family of interaction potentials with repulsion given by a Newtoni an potential and attraction in the form of a power law. We show global well -posedness of solutions and investigate analytically and numerically the eq uilibria and their global stability. The equilibria have biologically relev ant features\, such as finite densities and compact support with sharp boun daries. This is joint work with Yanghong Huang and Theodore Kolokolnikov. LAST-MODIFIED:20230127T203024Z LOCATION:MATH 3206 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint PDE/KI-Net Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110126T151500 DTEND;TZID=America/New_York:20110126T161500 RRULE:FREQ=WEEKLY;UNTIL=20110511T191500Z;BYDAY=WE DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com CREATED:00010101T000000Z DESCRIPTION:[Title] TBA\n[Speaker] TBA\n[Institution] TBA\n[Abstract] TBA LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111205T173000Z DTEND:20111205T183000Z DTSTAMP:20260828T094430Z UID:3ps8u4pbktq882eepepcbfko9o@google.com CREATED:20111129T150316Z DESCRIPTION:Title: Limits to non-cryogenic single-photon count rates\nSpeak er: Joshua Bienfang\, NIST\nAbstract: In single-photon quantum communicatio ns it is often the case that\, regardless of the encoding or protocol in us e\, the performance is strongly limited by the performance of the detectors . With this motivation\, there have been significant advances in the most c ritical parameters of single-photon detector performance: efficiency\, nois e\, and timing resolution. Recently\, research has been aimed at improving the maximum usable count rate\, particularly in widely available Geiger-mod e avalanche photodiodes. In these detectors\, the recovery time after an av alanche can be minimized by minimizing the amount of charge required to dis criminate an avalanche from noise\, the fundamental limit being the noise i n the pickup resistor. We present techniques that allow efficient single-ph oton detection with less than 100 fC per avalanche\, and count rates in the 100 MHz regime\, and discuss our approach to reach Johnson-noise limited s ingle-photon detection. \n\n LAST-MODIFIED:20230127T203012Z LOCATION:Physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Joshua Bienfang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221213T160000 DTEND;TZID=America/New_York:20221213T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221213T160000 CREATED:20210423T130624Z DESCRIPTION:Distinguished Scholar-Teacher Lectu re

    Professor Michelle Girvan

    Machine Learning for Forecasting Complex Systems


    In recent years\, machine lea rning methods such as "deep learning" have proven enormously successful for tasks such as image classification\, voice recognition\, and more. Despite their effectiveness for big-data classification problems\, these methods h ave been somewhat less successful for time series prediction\, especially f or complex systems like those we see in brain dynamics or social dynamics. In this talk\, I will discuss how a Reservoir Computer (RC) - a special kin d of artificial neural network that offers a "universal" dynamical system - can draw on its own internal complex dynamics in order to forecast complex systems. Like many other machine learning architectures\, RCs provide  \;a knowledge-free approach because they forecast purely from past measurem ents without any specific knowledge of the system dynamics. By building a s cheme that judiciously combines the knowledge-free prediction of the RC wit h a knowledge-based model\, we demonstrate a \;dramatic improvement in forecasting complex systems. In addition\, we show that we can forecast the dynamics of not only individual time series but also of very high-dimensio nal systems by constructing appropriate parallel RC architectures. Finally\ , we discuss how tuning an RC to operate close to the critical boundary bet ween quiescence and amplification may offer important performance advantage s. LAST-MODIFIED:20221212T121739Z LOCATION:1410 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Distinguished Scholar-Teacher Lecture/Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080926T173000Z DTEND:20080926T183000Z DTSTAMP:20260828T094430Z UID:3q05hakuqrqdfcfc30k2n8r1rs@google.com CREATED:20080912T164244Z DESCRIPTION:Speaker:Christopher Herzog\, Princeton University\nInstitution URL:http://www.princeton.edu/\nTitle:"Holographic Super Fluidity and Superc onductivity"\n LAST-MODIFIED:20230127T203320Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MARYLAND CENTER FOR FUNDAMENTAL PHYSICS COLLOQUIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111101T213000Z DTEND:20111101T230000Z DTSTAMP:20260828T094430Z UID:v3qfue7q1e7qspr5j28amutkak@google.com CREATED:20110825T172411Z DESCRIPTION:Title: Collider Physics (tutorial)\nSpeaker: Maxim Perelstein \ nInstitution: Cornell University LAST-MODIFIED:20230127T203706Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Collider Physics (Tutorial) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091030T150000Z DTEND:20091030T163000Z DTSTAMP:20260828T094430Z UID:dr41ibtke4shn0p11b75odok60@google.com CREATED:20091022T195011Z DESCRIPTION:Title : Photonic non-equilibrium quantum transport in a nonline ar optical fiber\nSpeaker Name: Mohammad Hafezi\nSpeaker Institution : Univ ersity of Maryland\, JQI\nNotes: website:\nhttp://www.physics.umd.edu/cmtc/ seminars.html\nAbstract : We theoretically study the transmission of few- photon quantum fields through a strongly nonlinear optical medium. We devel op a general approach to investigate non-equilibrium quantum transport of b osonic fields through a finite-size nonlinear medium and apply it to a rece ntly demonstrated experimental system where cold atoms are loaded in a holl ow-core optical fiber. We show that when the interaction between photons is effectively repulsive\, the system acts as a single-photon switch. In the case of attractive interaction\, the system can exhibit either anti-bunchin g or bunching\, associated with the resonant\nexcitation of bound states of photons by the input field. These effects can be observed by probing stati stics of photons transmitted through the nonlinear fiber. LAST-MODIFIED:20230127T203129Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20100506 DTEND;VALUE=DATE:20100507 DTSTAMP:20260828T094430Z UID:c2vc3m4klkkjq543ruhmdiip40@google.com CREATED:20100420T134615Z DESCRIPTION:9:00amVince Hilser\, Johns Hopkins University\, “An Ensemble Vi ew of Alostery”\n\n9:50amRuth Nussinov\, National Cancer Institute\, “Allos tery and Conformational Control of Sub Strate Orientation in Signaling: Uiq uitination in the Cullin-RING E3 Ligase Machinery”\n\n11:00amTerry Oas\, Du ke University\, “The Mechanism of Binding Coupled to Conformational Change: How Do We Know Which Comes First?”\n\n11:50amJie Chen\, University of Mary land\, “Promoter Melting Triggered by Bacterial RNA Polymerase Occurs in Th ree Steps”\n\n12:10pmLUNCH BREAK\n\n1:40pmDorothy Beckett\, University of M aryland\, “Folding and Dynamics in an Allosteric Response”\n\n2:10pmAlan Da vidson\, University of Toronto\, “The Role of Protein Folding Cooperativity in the Allosteric Mechanism of Tetracycline Respressor”\n\n3:20pmJannette Carey\, Princeton University\, “Structural and Thermodynamic Evidence for A llosteric Relaxed-State Symmetry”\n\n4:10pmCharalampos (Babis) Kalodimos\, Rutgers University\, “Dynamic Activation of Protein Folding”\n LAST-MODIFIED:20230127T203014Z LOCATION:Marker Seminar Room\, 0112 Chemistry & Biochemistry SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SYMPOSIUM TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091204T180000Z DTEND:20091204T191500Z DTSTAMP:20260828T094430Z UID:v1dd9k1quafiff64f3iqkdgj6g@google.com CREATED:20091201T152308Z DESCRIPTION:Title: Entanglement and Correlation Functions:\nBethe Ansatz ve rus Valence Bond Solid States\n \n \nSpeaker: Professor Vladimir Korepin\nC .N. Yang Institute for Theoretical Physics\nSUNY at Stony Brook\nStony Broo k\, NY LAST-MODIFIED:20230127T203555Z LOCATION:ITE Building\, Room 231 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMBC Joint CS/EE/PHYS Colloquium on Quantum Information Science TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111102T183000Z DTEND:20111102T200000Z DTSTAMP:20260828T094430Z UID:1r3timtclg2gmu30gpb7so4rrs@google.com CREATED:20110721T141445Z DESCRIPTION:SPEAKER: Bingwei Long - JLab\, Newport News VA \n\nTITLE: Cor rect Dr. Weinberg's Prescription --- Renormalization and Power Counting of Chiral Nuclear Forces\n\nABSTRACT: It has been known that Weinberg's origi nal scheme for organizing chiral nuclear forces is inconsistent in terms of renormalization group (RG) invariance. I will discuss how RG invariance co nstrains the power counting\, especially at subleading orders\, and its phe nomenological impact.\n\n LAST-MODIFIED:20230127T203738Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230126T173000Z DTEND:20230126T190000Z DTSTAMP:20260828T094430Z UID:683lpal1nlu68ub2nsfr6c2c10@google.com CREATED:20230118T214315Z DESCRIPTION:

    Title: Wave-matter interaction at the Exceptio nal Point
     

    Speaker: Tsampikos Kottos (Wave Transport in Complex Systems Lab\, Department of Physics\, Wesl eyan University)

    Abstract:  The manipulation and management of wave propagation using artificial struc tures with tailored landscapes (impedance profiles) was always an exciting subject – often challenging the creativity of the researchers and exciting the imagination of the public. Throughout the years\, many successful stori es\, that follow this line of research\, have been reported: photonic cryst als\, negative index materials\, and stealth technologies are some testamen ts of our increasing capabilities to manipulate the impedance profile of th e underlying material. Currently\, however\, an alternate viewpoint is emer ging: Its focus is to tailor the loss within the propagating medium\, thus elevating the attenuation – a mechanism which until recently was considered an “anathema”- to a useful design element whose manipulation can lead to t he realization of devices with non-conventional properties and novel functi onalities. In this talk\, we will highlight some of these results\, paying particular attention to some specific applications like hypersensitive sens ors for avionic instrumentation\, nano-indenters for micro-robotics\, and r eflecting optical limiting where our group has substantial contributions ov er the years.

    Time and Date: 12:30PM\, Thursd ay\, January 26th

    Place: IREAP Large Conference Room  (ERF 12 07)

      LAST-MODIFIED:20230118T214435Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081117T173000Z DTEND:20081117T183000Z DTSTAMP:20260828T094430Z UID:k5cihrku91sdefmmfmnndlou00@google.com CREATED:20080915T191305Z DESCRIPTION:Speaker:Jungsang Kim\, Duke University\nTitle:"Engineering a Qu antum Information Processor"\n LAST-MODIFIED:20230127T203201Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101020T170000Z DTEND:20101020T180000Z DTSTAMP:20260828T094430Z UID:97hrf0hn00u779o2bm4bq5m6ig@google.com CREATED:20101013T145602Z DESCRIPTION:Speaker: Ada Yonath\, 2009 Nobel Laureate \nTitle: The Amazing Ribosome LAST-MODIFIED:20230127T203503Z LOCATION:Hoff Theater\, Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Center for Biological and Structure Organization TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221104T160000Z DTEND:20221104T170000Z DTSTAMP:20260828T094430Z UID:70q8bgulu4irvj1qj9remd8fpa@google.com CREATED:20221029T003412Z DESCRIPTION:Title: New species of butterflies reported in topological crys talline states\nSpeaker: Naren Manjunath (University of Maryland)\nTime: Friday\, November 4\, 2022 - 12:00pm\nLocation: ATL 2324\n\nThe study of t opological phases of matter and the invariants that define them has become a central pursuit of condensed matter physics. In particular\, crystalline systems are known to host a large set of topological invariants\, but the p hysical response properties associated to them are still not fully understo od. In this talk we describe how to construct a topological response theory that makes detailed predictions about a set of crystalline topological inv ariants\; we focus on two of them\, the '\;discrete shift'\;\, and a quantized charge polarization. We show that these invariants can be extract ed from a lattice model by measuring the fractional charge at lattice defec ts such as disclinations and dislocations. To illustrate our method\, we st udy the Hofstadter model of spinless electrons in a background magnetic fie ld\, and show that these invariants lead to new '\;Hofstadter butterflie s'\; which significantly expand the known phase diagram of the model.\n\ n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221029T003412Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Naren Manjunath TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100127T203000Z DTEND:20100127T213000Z DTSTAMP:20260828T094430Z UID:ouvrbk3fhi6i2qohn3av8nmcjo@google.com CREATED:20100120T133831Z DESCRIPTION:Title: Small Josephson junctions in asymmetric SQUIDs\nBy: Dr. Dan Sullivan\nLaboratory for Physical Sciences\n \nAbstract:\nSmall Josephs on junctions are known to be susceptible to quantum fluctuations in the pha se difference across the junction\, resulting in an effective suppression o f the critical current. We have investigated a method for stabilizing this phase difference by shunting a small junction (with a critical current of ~ 1 nA) with an additional capacitance and incorporating the junction in a dc SQUID loop. The second junction in the Al/AlOx/Al SQUID has a much larger critical current (~ 1uA)\, producing a SQUID that is highly asymmetric. Our results show that the SQUID inductively couples the phase differences of t he large and small junctions\, leading to reduced phase fluctuations\, and thus allowing accurate measurement of the small junction's critical current at millikelvin temperatures.\n LAST-MODIFIED:20230127T203753Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, Co llege Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220927T150000Z DTEND:20220927T160000Z DTSTAMP:20260828T094430Z UID:1admijgc2q5lth516a9g8odv0o@google.com CREATED:20220815T164614Z DESCRIPTION:Literature Seminar: Tanner Myers\, UMCP

    Title : \;    PTBP1 Protects Transcripts From the Helicase UPF1 During Nonsense-mediated Decay LAST-MODIFIED:20220926T153820Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221108T160000Z DTEND:20221108T170000Z DTSTAMP:20260828T094430Z UID:6lo23gtbooogc8qorn54lg782k@google.com CREATED:20220815T165117Z DESCRIPTION:Speaker: Dr. Anne Kenworthy\, University of Virginia

    Title: \;    Assembly and Function of Nanodomains in Bi ological Membranes

    Abstract: \;Composed of an amphipa thic bilayer structure a mere two molecules thick\, lipid membranes are a d efining feature of cells. To carry out their biological functions in cells\ , membranes contain a vast array of lipids and proteins with distinct chemi cal properties. Multiple lines of evidence suggest that the components of m embranes are not well mixed. Instead\, they self-assemble laterally to gene rate a variety of compositionally distinct domains that range in size from nanometers to microns\, exist over a wide range of time scales\, and assume varying curvatures and morphologies. In this talk\, I will describe my gro up’s efforts to understand the physicochemical principles that govern the a ssembly and function of two related yet distinct types of nanoscale domains : membrane rafts and caveolae. LAST-MODIFIED:20221031T153403Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221109T190000Z DTEND:20221109T210000Z DTSTAMP:20260828T094430Z UID:356e246c8ipgh67s0dcebh1tkk@google.com CREATED:20221102T000943Z DESCRIPTION:Title: \; Entanglement\, dynamics and computatio n in many-body systems with power-law interactions
    Speaker: \; \ ;Andrew Guo (QuICS and JQI)
    Time: \; \;Wednesday\, November 9\, 2022 - 2:00pm
    Location: \; \;ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4349132819?pwd=Vml2QVpWd0o4UWxJUzZidWdQWUZVZz09 Meeting ID: 434 913 2819 Passcode: 123456

    Quantum many-body systems with long-range interactions—such as those that decay as a power-law in th e distance between particles—are promising candidates for quantum informati on processors. Due to their high degree of connectivity\, they are potentia lly capable of generating entanglement more quickly than systems limited to local interactions\, which may lead to faster computational speeds. The qu estions of the nature of the speed-ups they can achieve—as well as how to p rogram these long-range systems to achieve such speed-ups—are\, therefore\, of prime theoretical interest.

    To understand the nature of the spee d-ups achievable\, it is natural to consider the dual question\, which is w hat are the fundamental speed limits in quantum many-body systems? Given th at most systems relevant to quantum computation operate in the non-relativi stic regime—where information typically propagates at velocities far below the threshold set by the speed of light—the absence of an absolute speed li mit seems to allow for unbounded rates of information transfer. However\, i n 1972\, Lieb and Robinson restored a notion of locality in systems with lo cal interactions by proving a bound that led to light-cone-like regions out side which information propagation is exponentially suppressed. The questio n of whether similar bounds could be proven for long-range systems has rema ined open—until recently.

    In this thesis\, we will describe results related to the now-fuller picture of the fundamental rates of information p ropagation in power-law-interacting systems. First\, we consider the regime of “strongly long-range” interactions\, for which velocities can grow unbo und- edly with system size. We will present Lieb-Robinson-type bounds for t hese systems and also outline a protocol that can transfer quantum states a s fast as these bounds will allow. We will also discuss the implications of these bounds for quantum information scrambling.

    The second part of the thesis will study how protocols for transferring quantum states quickl y can be used to perform multi-qubit gates. In particular\, we will demonst rate how the power of long-range interactions allows one to implement the u nbounded fanout gate asymptotically faster than systems with local interact ions. This result also implies the hardness of simulating the dynamics of l ong-range systems evolving for superlogarithmic times\, and demonstrates th e potential for insights from quantum many-body physics to lead to a more p owerful toolbox for quantum computation.

    Finally\, we will address t he question of fundamental speed limits in quantum systems that are open to the environment. A priori\, it may seem surprising that such speed limits may exist\, since non-unitary processes may break locality constraints. How ever\, we show that under certain assumptions such as linearity and Markovi anity of the bath\, one can restore a notion of locality using Lieb-Robinso n-type bounds. We use the resulting bounds to constrain the entanglement st ructure of the steady states of open long-range systems\, a first step towa rds proving the area law for such systems.

    Join Zoom Meeting

    https://umd.zoom.us/j/4349132819?pwd=Vml2QVpWd0o4UWxJUzZidWdQWUZVZz09< /a>

    Meeting ID: 434 913 2819
    Passcode: 123456
    One tap mobile+13017158592\,\,4349132819# US (Washington DC)
    +13126266799\,\,4349132 819# US (Chicago)     LAST-MODIFIED:20221107T170534Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4349132819?p wd=Vml2QVpWd0o4UWxJUzZidWdQWUZVZz09 Meeting ID: 434 913 2819 Passcode: 1234 56 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Andrew Guo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100915T180000Z DTEND:20100915T190000Z DTSTAMP:20260828T094430Z UID:lid072nm5ac23ejfihgvb4dtos@google.com CREATED:20100910T151240Z DESCRIPTION:Title: "Integrating Measurement and Sociocognitive Perspectives in Educational Assessment"\nSpeaker: Robert Mislevy\nDepartment of Measure ment\, Statistics\, and Evaluation\nUniversity of Maryland\, College Park LAST-MODIFIED:20230127T203548Z LOCATION:PHYS 1303 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Education Research Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091029T180000Z DTEND:20091029T193000Z DTSTAMP:20260828T094430Z UID:kumfb6mdegmnn3pua3oji7iit0@google.com CREATED:20091022T144738Z DESCRIPTION:Title: Carbon Nanoelectronics: Towards Energy-\nEfficient Compu ting\nName: Professor Eric Pop\nInstitution: University of Illinois\, Urban a-Champaign\nAbstract: Power consumption is a significant challenge\, often limiting the performance of integrated circuits from mobile devices to mas sive data\ncenters. Carbon nanoelectronics have emerged as potentially ener gyefficient future devices and interconnects\, with both large mobility and \nthermal conductivity. This talk will focus on power dissipation in carbon nanotubes and graphene\, with applications to low-energy devices\, interco nnects and memory elements. Experiments have been used to\ngain new insight into the fundamental behavior of such devices\, and to better inform pract ical device models. The results suggest much room for energy optimization i n nanoelectronics through the design of\ngeometry\, interfaces\, and materi als.\nNotes: Refreshment will be served at 1:30pm in the Toll Room. LAST-MODIFIED:20230127T203832Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230118T190000Z DTEND:20230118T203000Z DTSTAMP:20260828T094430Z UID:6uq0k5o6vbjd3vnrpvvnjtcjfk@google.com CREATED:20230112T203721Z DESCRIPTION:
    Event: "What I Saw At the Equity\, Excellence\, and STEM Interface" 
    Date &\; Time: Wednesday\, January 18\, 2023 | 2:00 PM - 3:30 PM
    Location: Online via Zoom
    RSVP:     https://go.umd.edu/UM EEA-jim-gates-2023  LAST-MODIFIED:20230112T203721Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dr. Jim Gates Event - "What I Saw At the Equity\, Excellence\, and STEM Interface" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091104T180000Z DTEND:20091104T193000Z DTSTAMP:20260828T094430Z UID:dahtccggpoab1nlmf5dpdui6n0@google.com CREATED:20091002T181231Z DESCRIPTION:Title : Longitudinal Rescaling\, Integrability and Confinement\ nSpeaker Name: Peter Orland\nSpeaker Institution : Baruch College - CUNY\, New York\nAbstract : In the limit as the number of transverse dimensions g oes to zero\, Yang-Mills theory reduces to a 1+1-dimensional model\, which is \nasymptotically free and completely integrable. Integrability is exploi ted to study a confining gauge theory in 2+1 dimensions and a crude model o f high-energy scattering in 3+1 dimensions. The latter model arises from \n QCD by applying a large longitudinal rescaling. Anomalous dimensions of \nt his rescaling have been calculated to one loop. LAST-MODIFIED:20230127T203133Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091204T173000Z DTEND:20091204T220000Z DTSTAMP:20260828T094430Z UID:hr9ke8rmhda00qk9hevp3ch8nc@google.com CREATED:20091201T211131Z DESCRIPTION:12:30-1:15 William Donnelly\, "The Feynman Prescription in Curv ed Spacetime"\n\n1:15-2:00 Ryan Behunin\, "Moving mirror model of black hol e back action"\n\nBreak\n\n2:15-3:00 Haipeng An\, "Primordial perturbation and stochastic gravity".\n\n3:00-3:45 Rong Zhou\, " False vacuum decay wit h gravity: recent developments"\n\nBreak \n\n4:00-4:45 Doojin Kim "Membra nes in General Relativity and Branworld Cosmology"\n\nAll are welcome. Ligh t refreshment at breaks\n\n Contact: Prof. B. L. Hu\, (301) 405-6029 \, hubeilok@gmail.com\n LAST-MODIFIED:20230127T203323Z LOCATION:PHYS 1304 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Term Project Presentations by Students in Physics 776 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221012T193000Z DTEND:20221012T213000Z DTSTAMP:20260828T094430Z UID:0qca66cprchm4j55qhqic2a1c9@google.com CREATED:20220815T130800Z DESCRIPTION:Speaker: Dr. David Clarke\, Professor\, Materials an d Applied Physics\, Harvard University

    Title: TBA
    < br>Abstract: \;https://www.seas.harvard.edu/person/david-clarke     LAST-MODIFIED:20220927T123529Z LOCATION:Seminar held in Kay Boardrooms 1107/1111 Kim Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100217T173000Z DTEND:20100217T183000Z DTSTAMP:20260828T094430Z UID:dnifgoqh19a8vlb1ff2a5ksfj8@google.com CREATED:20100215T201254Z DESCRIPTION:SPEAKER: Toru Kojo\n\nAFFILIATION: Brookhaven National Lab\, U pton NY\n\nTITLE: Quarkyonic Chiral Spirals\n\nABSTRACT: We argue that the chiral symmetry breaking/restoration in cold\, \nconfining dense quark mat ter\, called "quarkyonic" matter\, whose presence is expected to be relevan t for intermediate density region of the phase diagram. There the confining correlation among quarks survives near the \nFermi surface. We will show t hat the strong infrared correlations induce the chiral spiral\, i.e.\, the spatial modulation of the chiral condensate. It breaks the chiral symmetry locally but restores it globally\, naturally connecting chiral symmetry bro ken phase and restored phase.\n LAST-MODIFIED:20230127T203340Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120726T143000Z DTEND:20120726T153000Z DTSTAMP:20260828T094430Z UID:qhacfvh9c83m8r28ddu8ms07kk@google.com CREATED:20120725T140011Z DESCRIPTION:Speaker: Y. Krockenberger\, NTT Basic Research Laboratories\, J apan\nTitle: Doping Independent Superconductivity in T'-cuprates\n\nThe dis covery of superconductivity in cuprates marked a breakthrough in solid stat e physics. Until superconductivity was found in electron doped cuprates the initial research efforts focused on hole doped cuprate systems. When elect ron doped cuprates are synthesized\, an annealing process is necessary in o rder to induce superconductivity since the as-grown sample contains non-sto ichiometric oxygen. This annealing process is performed under reducing atmo spheres\, i.e.\, Ar or vacuum. The reduction process causes severe modifica tions in the electronic structure\, e.g.\, at optimal doping levels\, the i n-plane resistivity is modified from insulating to metallic and superconduc ting behavior. We have prepared high quality single phase thin films of RE1 .85Ce0.15CuO4 and RE2CuO4 by MBE. For RE2CuO4 films\, an ex situ annealing process was used in order to induce superconductivity. As-grown RE2CuO4 sam ples are insulating antiferromagnets and an appropriate annealing process i nduces superconductivity. However\, the magnetic ground state of supercondu cting RE2CuO4 is subject to further investigations. We found that the super conducting properties are very similar for the ‘‘optimally-doped’’ and dopa nt-free T’-cuprates. We conclude that the ground state of T’-cuprates is a superconductor irrespective of the cerium substitution level.\nHost: Richar d Greene LAST-MODIFIED:20230127T203839Z LOCATION:CNAM Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130930T200000Z DTEND:20130930T210000Z DTSTAMP:20260828T094430Z UID:fhldph26kiosgpvnteipchsuao@google.com CREATED:20130924T173357Z DESCRIPTION:Title : Dynamics of Living Systems: From Actin Waves to Cell Mi gration.\n\nSpeaker Name: Professor Wolfgang Losert\n\nSpeaker Institution : UMCP\n\nNotes: Refreshments at 3:30pm\n LAST-MODIFIED:20230127T203549Z LOCATION:PHYS Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130314T193000Z DTEND:20130314T203000Z DTSTAMP:20260828T094430Z UID:uhdst8of33aod1hu8dsjlgh2q8@google.com CREATED:20130118T144630Z DESCRIPTION:Title: Performance of a quantum annealer: experiments on the D- Wave machine\nSpeaker: Professor Matthias Troyer\nInstitute for Theoretical Physics\, Swiss Federal Institute of Technology (ETH)\, Zurich\, Switzerla nd\n\nAbstract: At a time when quantum effects start to pose limits to fur ther miniaturization of classical devices and of the exponential performanc e increase of Moore's law\, quantum technology is maturing to the point whe re quantum devices\, such as quantum communication systems \, quantum rando m number generators and quantum simulators\, can be built with powers excee ding the performance of classical computers. A quantum annealer\, in partic ular\, finds solutions to hard optimization problems by evolving a known in itial configuration towards the ground state of a Hamiltonian that encodes an optimization problem. In this talk I will present results from quantum a nnealing experiments on a 108 qubit D-Wave device based on superconducting flux qubits. Correlations between the device and a simulated quantum anneal er demonstrate that device performs quantum annealing which\, unlike classi cal thermal annealing\, exhibits a bimodal separation of hard and easy prob lems with small-gap avoided level crossings characterizing the hard problem s. To assess the computational power of the quantum annealer we compare it to highly optimized classical algorithms\, and discuss how quantum speedu p could be detected on future devices scaled to a larger number of qubits.\ n\nNote: Guests should use the phone on the left hand side of the LPS front door for entry. Contact Dr. Frank Gaitan (LPS\, fgaitan@lps.umd.edu) to a rrange a meeting with the speaker prior to the seminar. LAST-MODIFIED:20230127T203104Z LOCATION:Lower Level\, LPS\, 8050 Greenmead Dr.\, College Park\, MD\, 301-9 35-6400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120217T180000Z DTEND:20120217T223000Z DTSTAMP:20260828T094430Z UID:htba3b42tnrmveb9dkrbg2fr1k@google.com CREATED:20120207T195801Z DESCRIPTION:Schedule:\n\n 1:00 - 2:00 -- Catered Lunch\n 2:00 - 2:30 -- Chris Reynolds -- Observational Overview of Accretion Disks Around Black Holes and Neutron Stars\; Common Themes\n 2:30 - 2:50 -- Richard Mushot zky -- Disks and Jets\, from Protostars to AGN\n 2:50 - 3:10 -- Roman Sh cherbakov -- The Feeding Habits of Our Galactic Center\n 3:10 - 3:30 -- Jeremy Schnittman -- What Could We Learn About Disks from GEMS and Polariza tion?\n 3:30 - 4:00 -- Break (Snacks and Beverages)\n 4:00 - 4:30 -- Julian Krolik -- Issues in the Theory of Accretion Disks\n 4:30 - 4:50 - - Tamara Bogdanovic -- Disks Around Binaries: from the Newtonian to the Gen eral Relativistic Regimes\n 4:50 - 5:10 -- John Baker -- Effects of Accr etion Disks on Spins and Eccentricities of Binaries\, and Implications for Gravitational Waves\n 5:10 - 5:30 -- Manuel Tiglio -- Challenges in Inco rporating Matter and Electromagnetic Fields Around Binary Black Holes in GR \n\n(Lunch available beginning at 1 pm in the concourse area outside of Rm. 2400) LAST-MODIFIED:20230127T203633Z LOCATION:Room 2400 Computer & Space Sciences Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium "Accretion Astrophysics" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220927T150000Z DTEND:20220927T160000Z DTSTAMP:20260828T094430Z UID:7prgudeqtfuj26it0nd1r22ote@google.com CREATED:20220925T233210Z DESCRIPTION:Title:  Quantum gravity experiments on a quantum computer
    Sp eaker:  Hrant Gharibyan (Caltech)
    Time:  Tuesday\, September 27\, 2022 - 11:00am
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9 893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 ID: 9893676372 passcode: abc123

    With the long-term goal of studying quantum gravity on a qua ntum computer\, I will discuss several results that make promising progress in this direction. Firstly\, I will discuss a proposal for a holographic t eleportation protocol that can be readily executed in table-top experiments . This protocol exhibits similar behavior to that seen in recent traversabl e wormhole constructions. Then\, I will present a result on simulating matr ix model Hamiltonians (that are dual to superstring theory) on quantum hard ware and lastly\, I will briefly discuss an ongoing work on preparation of holographic error-correction code on trapper ion systems.  

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    M eeting ID: 989 367 6372
    Passcode: 578842 LAST-MODIFIED:20220925T233210Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 ID: 9893676372 passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Hrant Gharibyan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221202T183000Z DTEND:20221202T193000Z DTSTAMP:20260828T094430Z UID:507l9ps64sl87o9kj8p7u23do8@google.com CREATED:20220811T141836Z DESCRIPTION:**Special Joint Cornell/UMD Seminar**< br>
    Speaker: Ian Moult\, Yale

    Seminar will be preceded by bring y our own lunch at 12:30pm.

    Title: Conformal Colliders Meet the LHC
    Abstract: Jets of hadrons produced at high-energy colliders provide e xperimental access to the dynamics of asymptotically free quarks and gluons and their confinement into hadrons. Motivated by recent developments in co nformal field theory\, we propose a reformulation of jet substructure as th e study of correlation functions of a specific class of light-ray operators and their associated operator product expansion (OPE). We show that multi- point correlation functions of these operators can be measured in real LHC data\, allowing us to experimentally verify properties of the light-ray OPE . We then discuss how this reformulation provides new ways of experimentall y studying the Standard Model at colliders\, as well as new theoretical tec hniques for performing calculations in QCD.
     LAST-MODIFIED:20221129T152436Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Ian Moult\, Yale *Special Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121203T173000Z DTEND:20121203T183000Z DTSTAMP:20260828T094430Z UID:u25s64h5oqu3falqqkd3qf0j6o@google.com CREATED:20121126T195619Z DESCRIPTION:Coherent coupling of diamond spin qubits to mechanical\nresonat ors\nAnia C. Bleszynski Jayich1\, Preeti Ovartchaiyapong1\, Laetitia Pascal 1\, Bryan A.\nMyers1\, Shimon Kolkowitz2\, Quirin Unterreithmeier2\, Steven D. Bennett2\, Peter\nRabl3\, J.G.E. Harris4\, and Mikhail D. Lukin2\n1Depa rtment of Physics\, University of California Santa Barbara\n LAST-MODIFIED:20230127T203119Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Ania Jayich TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221118T150000Z DTEND:20221118T160000Z DTSTAMP:20260828T094430Z UID:2qtf4houe75kuauvraj2cf6sn5@google.com CREATED:20221111T211923Z DESCRIPTION:Title:  Quantum recurrent neural networks
    Speaker:  Viktoria Schmiesing (Leibniz University Hannover)
    Time:  Friday\, November 18\, 2022 - 10:00am
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom .us/j/95581983776?pwd=WHdRWTZSTW5UeW5MSmtnVjJPckYzQT09

    I will ta lk about quantum recurrent neural networks based on quantum dissipative neu ral networks (DQNNs)\, which use quantum neural networks to describe genera l causal quantum automata. I will first introduce feed-forward DQNNs and th en go to the recurrent case. After discussing the architecture and universa lity\, I will discuss training algorithms and numerical results showing goo d generalisation behaviour. LAST-MODIFIED:20221111T211923Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95581983776? pwd=WHdRWTZSTW5UeW5MSmtnVjJPckYzQT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Viktoria Schmiesing TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111019T190000Z DTEND:20111019T200000Z DTSTAMP:20260828T094430Z UID:ouu6l9k0m1laco7gcaj0resq7s@google.com CREATED:20111013T142851Z DESCRIPTION:Title: IBM’s efforts towards building a quantum computer\nSpeak er: Dr. Matthias Steffen\, IBM T.J. Watson Research Center\nAbstract: Coher ence times for superconducting qubits (in 2D) have increased drastically ov er the past 10 years with improvements exceeding a factor of 1000x. However \, with a few exceptions\, these appeared to have reached a plateau around 1-2 microseconds\, the limits of which were not well understood. Here\, we present experimental data showing that one limit is due to infra-red radiat ion\, confirming observations from other groups. With appropriate IR shield ing\, we observe coherence times (T1 and T2) near 5 microseconds. We furthe r demonstrate a novel two-qubit gate based entirely on microwave pulses usi ng fixed frequency qubits\, eliminating the need for tunable qubits. We sho w gate fidelities as high as 93% on a sample with T1\,T2=3-4us. Given two-q ubit gate speeds of 100ns\, gate fidelities are limited to about 98%\, ushe ring a new realm of possibilities for superconducting qubits!\n\n LAST-MODIFIED:20230127T203346Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Pa rk\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111102T211500Z DTEND:20111102T224500Z DTSTAMP:20260828T094430Z UID:54np8nd224312oo8p38jvrococ@google.com CREATED:20110825T172609Z DESCRIPTION:Title: Collider Physics\nSpeaker: Maxim Perelstein \nInstitutio n: Cornell University LAST-MODIFIED:20230127T203504Z LOCATION:1201 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Collider Physics Lecture 3 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100126T160000 DTEND;TZID=America/New_York:20100126T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100126T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Victor Yakovenko\, University of Maryland\nTitle: "New Developments in Statistical Mechanics of Money\, Income\, and Wealth"\nAbs tract: This talk will review the progress in applications of statistical\np hysics to probability distributions of money\, income\, and wealth in a\nso ciety [1]. Using analogy between the probability distributions of\nenergy in physics and money in economics\, I argued that the\ndistribution of mone y should follow the exponential Boltzmann-Gibbs\nlaw for certain classes of models with interacting economic agents\n[2]. Analysis of the empirical d ata shows that income distribution in\nthe USA has a well-defined two-class structure. The majority of the\npopulation (about 97%) belongs to the low er class characterized by the\nexponential ("thermal") distribution. The u pper class (about 3% of\nthe population) has the Pareto power-law ("superth ermal")\ndistribution\, whose share of the total income expands and contrac ts\ndramatically following the bubbles and busts in financial markets.\nWhe n debt is included in the statistical models\, it destabilizes the\nBoltzma nn-Gibbs distribution in the absence of an intrinsic mechanism\nfor limitin g debt. As a result\, the nominal wealth growth of the\nupper class largel y comes from the debt growth of the lower class\,\nuntil the economy collap ses under the burden of excessive debt. I\nwill also briefly discuss the d istribution of energy consumption per\ncapita around the world and show tha t it also follows the exponential\nBoltzmann-Gibbs law [3]. The data show how globalization of the world\neconomy affects the inequality of energy co nsumption. This talk is a\nfollow-up to the econophysics session "What Wen t Wrong with the Global\nEconomy?" at the 2010 Meeting of AAAS [4]. More r eferences can be\nfound at the Web site [5].\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230119T150000Z DTEND:20230119T160000Z DTSTAMP:20260828T094430Z UID:7k2a476l65spjspc148u0cs1d2@google.com CREATED:20230104T133535Z DESCRIPTION:Title:  Quantum Back-action Limits in Dispersively Measured Bos e-Einstein Condensates
    Speaker:  Emine Altuntas (JQI)
    Time:  Thursday \, January 19\, 2023 - 10:00am
    Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390

    In recent years\, there have been rapid breakthroughs in quantum techn ologies that offer new opportunities for advancing the understanding of bas ic quantum phenomena\; realizing novel strongly correlated systems\; and en hancing applications in quantum communication\, computation\, and sensing. Cutting edge quantum technologies simultaneously require high fidelity quan tum-limited measurements and control. Large-scale applications of these cap abilities hinge on understanding system-reservoir dynamics of many-body qua ntum systems\, whose Hilbert space grows exponentially with system size. Ul tracold atoms - our workhorse for quantum simulation\, are an ideal platfor m for understanding the system-reservoir dynamics of many-body systems. In this talk\, I will present the characterization of measurement back-action in atomic Bose-Einstein condensates\, weakly interacting with a far-from re sonant\, i.e.\, dispersively interacting\, laser beam. We theoretically des cribe this process using a quantum trajectories approach where the environm ent measures the scattered light and I will present our measurement model b ased on an ideal photodetection mechanism. Next\, I will discuss our experi mental quantification of the resulting wavefunction change with two observa tions: the contrast of a Ramsey interferometer and the deposited energy [1\ , 2]. In this perspective\, I will then identify the ensuing systematic eff ects: stray optical lattices (a technical consequence of weak retro-reflect ions of the probe beam) and probe-induced photoassociation (an intrinsic at omic process). Not all degrees of freedom are equally impacted by these sys tematic effects: the reduction in contrast of a Ramsey interferometer is ba ck-action limited whereas the added energy is in excess of what is expected from light scattering alone. I will conclude with a discussion of experime ntal and theoretical implications\, and potential future directions for res earch.

    [1] E. Altuntaş and I. B. Spielman\, arXiv preprint arXiv:220 9.04400 (2022).

    [2] E. Altuntaş and I. B. Spielman\, arXiv preprint arXiv:2212.03431 (2022). LAST-MODIFIED:20230104T133535Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Emine Altuntas TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131030T140000Z DTEND:20131030T210000Z DTSTAMP:20260828T094430Z UID:v8jjpgdl9c3pdj1h0vlbud2dm8@google.com CREATED:20131016T141946Z DESCRIPTION:Second day of scheduled talks for the\nCMTC Fall Symposium:\n\n (All are welcome to attend the talks)\n\nWeiran Li: 10:00am – 10:45am “St rongly interacting (repulsive) quantum gases in ultracold atoms”\n\nXiaopen g Li: 10:45am – 11:30am “Chiral orbital state and its detection in novel optical lattices"\n\nAlejandro Lobos: 11:30am – 12:15pm “Electrical detec tion of topological quantum phase transitions in disordered Majorana nanowi res”\n\nStefan Natu: 12:15pm – 1:00pm “Many body physics in dipolar Bose gases — near and far from equilibrium”\n\nBreak: 1:00pm – 2:00pm\n\nBitan Roy: 2:00pm – 2:45pm “Axionic superconductivity in three dimensional narr ow-gap semiconductors”\n\nValentine Stanev: 2:45pm – 3:30pm “Time-reversa l symmetry breaking in multiband superconductors”\n\nRobert Throckmorton: 3:30pm – 4:15pm “Electronic multicriticality in bilayer graphene”\n\nXin W ang: 4:15pm – 5:00pm “Robust quantum gates for spin qubits using composit e pulses” LAST-MODIFIED:20230127T203343Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Fall Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111026T183000Z DTEND:20111026T200000Z DTSTAMP:20260828T094430Z UID:lrurebmi2qahav1kcubekl04u4@google.com CREATED:20110804T134616Z DESCRIPTION:SPEAKER: Jesse Thaler - Massachusetts Inst of Technology\, Cam bridge \nTITLE: N-subjettiness \nABSTRACT: Many beyond the standard model scenarios predict that the LHC will produce new heavy particles with decay channels involving top quarks\, W/Z bosons\, and Higgs bosons. If these t op quarks and electroweak bosons are sufficiently boosted\, then their deca ys can be misreconstructed as a single fat jet. In this talk\, I describe a new jet shape\, N-subjettiness\, designed to tag boosted hadronically-dec aying objects and reject the background of QCD jets with large invariant ma ss. I will argue that N-subjettiness combines the advantages of jet shapes with the discriminating power seen in previous jet substructure algorithm s. I will also suggest that techniques learned from N-subjettiness may be applicable to entire events\, pointing toward new algorithms for jet recon struction. \n \n LAST-MODIFIED:20230127T203419Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Particle Theory/Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221121T213000Z DTEND:20221121T223000Z DTSTAMP:20260828T094430Z UID:6n1ruo0s86vg2mkvndge37ud3r@google.com CREATED:20221109T174937Z DESCRIPTION:Title: \;Cosmic Antipart icle: Latest Results from the Alpha Magnetic Spectrometer on the Internatio nal Space Station

    Speaker: Zhili Weng\, \;MIT
    < u>
    Abstract: \;The Alpha Magnetic Spectrometer (AMS) is a pr ecision particle physics detector on the International Space Station conduc ting a unique\, long-duration mission of fundamental physics research in sp ace. In this talk\, I will present the latest AMS results on the fluxes of cosmic positrons and antiprotons. These latest results up to the TeV region reveal unique properties of cosmic elementary particle fluxes and indicate the existence of a primary source of high-energy antiparticles such as dar k matter annihilation. I will also report on the recent progress of antideu teron measurement and its future prospects. The latest results from AMS\, t ogether with its future measurements\, continue to provide unique insights into studying the origin of dark matter and antimatter\, and exploring new physics phenomena in the cosmos.

    Talk recording

    Notes: Jo in the meeting at 4:15 for meet and greet.  \;
    Visit https://bit.ly/2PmJoT6 to be added to t he email list.
    LAST-MODIFIED:20221214T163120Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110314T200000Z DTEND:20110314T210000Z DTSTAMP:20260828T094430Z UID:ul8j2pphl6nqtt1jpejrbl3pss@google.com CREATED:20110307T134014Z DESCRIPTION:Speaker:Michael Rubinstein\, University of North Carolina\nTitl e:"Biophysics of Lungs - Molecular Model of the Airway Surface Layer" LAST-MODIFIED:20230127T203754Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100303T170000Z DTEND:20100303T180000Z DTSTAMP:20260828T094430Z UID:f2ckc7nna8f31cs0t72b3iiioc@google.com CREATED:20100125T183225Z DESCRIPTION:Title : AppEl Seminar - Distributed Co-operative Control and Na vigation of Unmanned Aerial Vehicles via Wireless Communications\nSpeaker N ame: Nuno Martins\nSpeaker Institution : University of Maryland LAST-MODIFIED:20230127T203556Z LOCATION:1207 Energy Research Facility SEQUENCE:2 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221012T170000Z DTEND:20221012T180000Z DTSTAMP:20260828T094430Z UID:58skoc4jqtt0ida4s34e9062rh@google.com CREATED:20221005T225936Z DESCRIPTION:Title:  The Yamakawa-Zhandry breakthrough
    Speaker:  Daochen Wang (QuICS)
    Time:  Wednesday\, October 12\, 2022 - 1:00pm
    Location:   ATL 3100A and Virtual Via Zoom: https:// umd.zoom.us/j/96508005344

    Recently\, Yamakawa and Zhandry constr ucted a problem and proved that it admits a super-polynomial quantum speedu p in the average case. Before their work\, we only knew of problems that ad mit a super-polynomial quantum speedup in the worst case. In this talk\, I will describe their problem and go over some key steps in their proof. I wi ll also briefly discuss how their result can be construed as a non-interact ive proof of quantumness relative to a random oracle.

    References: “V erifiable Quantum Advantage without Structure” (arxiv.org< /a>) and “Quantum Algorithms Conquer a New Kind of Problem” (Quanta magazin e). LAST-MODIFIED:20221005T225936Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Daochen Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090211T190000Z DTEND:20090211T200000Z DTSTAMP:20260828T094430Z UID:s5bo7rgf2n2dpcphbbo1a6992c@google.com CREATED:20090209T163603Z DESCRIPTION:Speaker: Professor Christopher Jones\, Department of Mathematic s\, University of North Carolina at Chapel Hill and University of Warwick\n Title: Going With the Flow and Using the Information LAST-MODIFIED:20230127T203454Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090401T193000Z DTEND:20090401T203000Z DTSTAMP:20260828T094430Z UID:hsrpr28mfg0vho5n01djnajf6k@google.com CREATED:20090323T151350Z DESCRIPTION:Title: Modeling MOSFET Performance below 4K\nSpeaker: Dr. Marty Peckerar\, UMD\n LAST-MODIFIED:20230127T203803Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110405T150000Z DTEND:20110405T163000Z DTSTAMP:20260828T094430Z UID:aog2n7hvku1gnjlqffvi63l7pg@google.com CREATED:20110330T132644Z DESCRIPTION:Title : Plasma Analogy and non-Abelian Braiding Statistics in I sing-type Quantum Hall States\nSpeaker Name: Parsa Bonderson\nSpeaker Insti tution : Microsoft Q\nNotes: For more events see http://www.physics.umd.edu /cmtc/seminars.html\nAbstract : Quantum Hall systems are effectively two-di mensional and thus allow for quasiparticle excitations with exotic exchange statistics based on the braid group. These may be “anyons” with fractional statistics that lie somewhere between that of bosons and fermions\, or\, e ven more exotically\, “non-Abelian anyons” with quasiparticle exchange repr esented by matrices. The quasiparticle statistics of candidate quantum Hall states (universality classes) is usually conjectured\, but in some instanc es can be deduced from their representative trial wavefunctions. I will exp lain how this can be done for wavefunctions with a “plasma analogy” similar to Laughlin’s. Then I will construct a plasma analogy for the non-Abelian Ising-type states\, e.g. the Moore-Read state. This provides the first comp lete proof of the non-Abelian braiding statistics of quasiparticles in thes e states\, which are likely candidates to explain the observed Hall conduct ivity plateaus in the second Landau level\, most notably the one at filling fraction nu=5/2.\n LAST-MODIFIED:20230127T203409Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091005T200000Z DTEND:20091005T210000Z DTSTAMP:20260828T094430Z UID:1vsf56gpmgd0iaoof12jqkdm7s@google.com CREATED:20090929T122828Z DESCRIPTION:Speaker: Hari Schroff\, National Institutes of Health\n\nTitle : "Pushing the envelope in biological imaging"\n LAST-MODIFIED:20230127T203545Z LOCATION:Room IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120301T190000Z DTEND:20120301T201500Z DTSTAMP:20260828T094430Z UID:0h0vdk4gcm87mfan9fsq6gcts0@google.com CREATED:20120224T151552Z DESCRIPTION:"Collective Behavior of Network-Coupled Dynamical Systems"\nPro f. Juan G. Restrepo\nUniversity of Colorado\, Dept. of Applied Mathematics LAST-MODIFIED:20230127T203506Z LOCATION:Math 3206 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221110T210000Z DTEND:20221110T220000Z DTSTAMP:20260828T094430Z UID:5199qbs3qbfdpkoamii4fatcf0@google.com CREATED:20220829T151125Z DESCRIPTION:

    Alan Henry \; (B.S. '02\, physics\; B.S. '02\, astronomy)
    Special Proje cts Editor
    Wired Magazine

    Th ursday\, November 10\, 2022
    3:30 p.m. Reception\, ESJ Sculptur e Lounge
    4 p.m. Lecture\, ESJ 0202


    About the Talk
    Marginalization—essenti ally being excluded from opportunities\, career advancement\, or even the t ools available to others for personal\, academic\, and professional success —happens to everyone\, in some fashion. Whether you're a woman in a majorit y male workspace\, a person of color in a majority white field\, an LGBTQ+ person in a majority cisgender\, heterosexual environment\, a disabled pers on in virtually any space\, you likely face challenges to doing your best w ork that your more privileged colleagues don't face.

    When I s tepped into journalism\, I learned the hard way that simply being skilled\, talented\, and doing the best work you can—and even excelling at that work —often just isn't enough to get ahead. I found myself subject to a world of microaggressions\, gaslighting\, and other behavior designed to keep me aw ay from growth opportunities and prestige assignments\, and instead I was g iven the day-to-day "office housework" that was required to keep our teams running but certainly not the kind of work that made the best use of my ski lls or could move my career forward. As that happened\, I looked around and observed the same things happening to my peers and colleagues not just acr oss media\, but in my prior fields\, from technology to science. So I devel oped a set of tools and techniques to identify marginalization when it happ ens\, adapt to it\, push back against it\, and succeed in spite of it anywa y.

    In this seminar\, I'll share those experiences\, those to ols for career success\, personal productivity\, and mental health\, as wel l as how my background in science was (and is) instrumental in how I found my path\, and how you can find yours.

    About the Speaker

    Alan Henry (B.S. '02 physics\; B.S. '02\, astronomy) is the author of Seen\, Heard\, and Paid: The New Work Rules for the Margin alized. He is a a service journalist and editor who writes and commissi ons stories that help readers make better use of technology and embrace a h ealthier relationship with it in their lives. He is currently the special p rojects editor at WIRED. He was previously the Smarter Living editor at The New York Times\, and before that the editor in chief of the product ivity and lifestyle blog Lifehacker.

    This event is hos ted and sponsored by the     CMNS Diversity &\; Inclusion Advisory Council.

     \;https://science.umd.edu/events/dei-he nry.html

    Registration is welcome but not required: https://science.umd.edu/e vents/dei-henry.html

    Contact Abby Robinson at abbyr@umd.edu or 301-405-5845.

     LAST-MODIFIED:20221104T153917Z LOCATION: ESJ 0202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Productivity Without Privilege: Job-hacking Rules for the Marginali zed TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111214T173000Z DTEND:20111214T190000Z DTSTAMP:20260828T094430Z UID:7fherc02cghh16huulb4hvb1k8@google.com CREATED:20111209T194521Z DESCRIPTION:SPEAKER: Nakoi Yamamoto - Univ of Washington\, Seattle\n\nTITL E: The QCD Phase Diagram: Universality and Continuity\n\nABSTRACT: The QCD phase diagram at finite temperature and baryon density is one of the key i ssues within the standard model. In this talk\, we discuss the phase diagra ms of QCD and QCD-like theories from the viewpoints of the large-Nc univers ality and the quark-hadron continuity. First we show that the whole or the part of the phase diagrams are universal between QCD and QCD-like theories in the large-Nc limit. From this universality\, we derive some rigorous\nco nstraint on the chiral phase transition in large-Nc QCD at high\ntemperatur e and finite baryon density. Second we argue that the\ncontinuity from hadr onic matter to quark matter universally appears in\nflavor-symmetric QCD an d QCD-like theories at low temperature and high\ndensity. We also discuss t heir possible implications. LAST-MODIFIED:20230127T203658Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120313T173000Z DTEND:20120313T190000Z DTSTAMP:20260828T094430Z UID:tim3238fh61v3pjpltnmeec21g@google.com CREATED:20120305T191042Z DESCRIPTION:SPEAKER: Lu Ma\, Zhi Yuan College\, Shanghai JiaoTong Universit y\nTITLE: Direct Measurement of Xenon Purity by RGA and Cold Trap Method LAST-MODIFIED:20230127T203159Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nucl Phys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111109T193000Z DTEND:20111109T210000Z DTSTAMP:20260828T094430Z UID:udbeollc7entmo0ufjpj3adv4g@google.com CREATED:20110722T131803Z DESCRIPTION:SPEAKER: Kevin Dusling - North Carolina State Univ\, Raleigh \ nTITLE: Bulk Viscosity\, Particle Spectra and Flow in Heavy Ion Collision s\nABSTRACT: We study the effects of bulk viscosity on pT spectra and ell iptic flow in heavy ion collisions. For this purpose we compute the dissipa tive correction df to the single particle distribution functions in leading -log QCD\, and in several simplified models. We consider\, in particular\, the relaxation time approximation and a kinetic model for the hadron resona nce gas. We implement these distribution functions in a hydrodynamic simula tion of Au + Au collisions at RHIC. We find significant corrections due to bulk viscosity in hadron pT spectra and the differential elliptic flow para meter v2(pT). These corrections are dominated by viscous corrections to the distribution function. We find that the relation between df and the bulk v iscosity is different in the quark gluon plasma and hadronic phases. Reliab le bounds on the bulk viscosity require accurate calculations of df in a ha dronic resonance gas. Based on v2 spectra at RHIC we conservatively estimat e zeta/s <= 0.05 near freeze-out. We also find that effects of the bulk vi scosity on the pT integrated v2 are small. \n \n\n \n LAST-MODIFIED:20230127T203612Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121029T160000 DTEND;TZID=America/New_York:20121029T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121029T160000 CREATED:20120904T140915Z DESCRIPTION:The Biophysics seminar originally scheduled for Oct 29 has been postponed LAST-MODIFIED:20230127T203255Z LOCATION:Bioscience Building (BRB413) Room 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Biophysics seminar originally scheduled for Oct 29 has been pos tponed TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230206T160000Z DTEND:20230206T170000Z DTSTAMP:20260828T094430Z UID:10bd6r6fgfbjaam609t044k6m7@google.com CREATED:20221115T172920Z DESCRIPTION:Speaker: Sergey Polyakov (NIST)

    Title: Optical quantum m easurement: from fundamental physics to applications 

    Abstrac t: Faint states of light occur in multiple contexts\, from fundamenta l physics to quantum information science to remote sensing and biology. At the same time\, faint light naturally lends itself to optical quantum measu rements. Such measurements not only enable detecting and using quantum prop erties of light such as entanglement and antibunching - but they also becom e a tool to observe and quantify quantum processes inside faint light sourc es.

    In this talk\, I will describe examples of optical quantu m measurements. We will discuss a quantum state identification problem and its fundamental properties. We will see how this problem is intertwined wit h the theory of communications and how quantum measurements can be applied to enhance optical communication links and to benefit classical and quantum networks.

    In the second half\, I will cover measurements related to photon number statistics and correlations. It turns out that those measure ments can  identify different sources of light and measure underlying class ical and non-classical dynamics that leads to or accompanies emission. Thos e measurements rely on detecting and quantifying emitted light only\; thus\ , they are non-invasive. We will see several applications of this technique : from understanding single-photon emission in solid-state quantum dots to accurate counting single biomarkers and molecules in biologic settings. LAST-MODIFIED:20230125T205051Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar: Sergey Polyakov (NIST) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120912T183000Z DTEND:20120912T193000Z DTSTAMP:20260828T094430Z UID:jethkd9tfrlh0um1g20l4dj2sg@google.com CREATED:20120904T155452Z DESCRIPTION:SPEAKER: Mikhail Stephanov - University of Illinois at Chicago \nTITLE: Hydrodynamic Noise and Bjorken Expansion\nABSTRACT: We describe i ntrinsic hydrodynamic fluctuations of the expanding\nboost-invariant (Bjork en) solution. We find that these fluctuations are\ncorrelated over a wide r apidity range due to the propagation of sound\nmodes\, whose dispersion is nontrivial because of the expansion. The\nmagnitude of these fluctuations\, dictated by fluctuation-dissipation\ntheorem\, are proportional to viscosi ty\, and their measurement can\, in\nprinciple\, be used to obtain informat ion about the transport\ncoefficients as well as thermodynamic properties o f the medium. LAST-MODIFIED:20230127T203658Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131003T180000Z DTEND:20131003T193000Z DTSTAMP:20260828T094430Z UID:v6emvehom688u8lhb2rt0h90p8@google.com CREATED:20130926T214538Z DESCRIPTION:Speaker: Prof. Ian Appelbaum\, University of Maryland\n\nTitle : Harmonic Detection of the "Majorana Fermion"\n\nAbstract: The recent ob servation of a magnetic field-induced zero-bias conductance feature in the proximity superconductivity tunneling spectrum gap of a semiconductor nanow ire has spurred claims of a solid-state bound Majorana fermion. However\, f ailure of the observed superconducting gap to close before the new feature appears is particularly problematic\nbecause the gap closure marks a topolo gically critical boundary for the expected formation of the Majorana quasip article. Since the Majorana state is bound to the endpoints in 1-d\, we ca nnot simply contact it with a conductor to prepare a bulk tunnel conductanc e measurement and expect the dimensionality - and topological state - to pe rsist. Here I propose an alternative technique which exploits harmonic gen eration under AC excitation in a hybrid tunneling capacitor to measure the proximity superconducting gap of a 1-d nanowire without any perturbing ohmi c contact. To substantiate the proposal\, a numerical simulation of harmoni c generation using the discrete spin-orbit-coupled\,\nsuperconducting 1-d w ire spectrum as a function of magnetic field is performed. LAST-MODIFIED:20230127T203729Z LOCATION:Phys Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221013T180000Z DTEND:20221013T193000Z DTSTAMP:20260828T094430Z UID:7b7dip9eem407snd50f2abcf8q@google.com CREATED:20221003T180519Z DESCRIPTION:Speaker: Yuxun Guo\, UMD


    Title: Unravelin g the 3D Structure of Nucleon \;
     \;
    Abstract: Nucleon 3D structure has been one of the most important goals in modern nuc lear physics\, which will provide\, among other insights\, an intuitive und erstanding of how the fundamental properties of the nucleon\, such as its m ass and spin\, arise from the underlying quark and gluon degrees of freedom . In this talk\, I will discuss how to study the 3D structure of nucleon vi a generalized parton distributions with inputs from experiments\, lattice a nd global fits. I will discuss various exclusive measurements at HERA\, JLa b that can be used to probe the nucleon 3D structures as well as progresses in lattice QCD calculation related to nucleon 3D structures. I will also i ntroduce a global analysis program that combines both experiment and lattic e inputs and generate the state-of-art GPDs\, which will \;shed a refre shing new light on the problem of proton structure and confinement. LAST-MODIFIED:20221011T142041Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110201T181500Z DTEND:20110201T193000Z DTSTAMP:20260828T094430Z UID:phbqr2uugef3o2ht5kq4n514dg@google.com CREATED:20110124T141716Z DESCRIPTION:Title : Modeling the Dynamics of Gene Regulatory Networks\nSpea ker Name: Dr. Michelle Girvan\nSpeaker Institution : University of Maryland \nNotes: As in the past\, each seminar will be preceded by an INFORMAL CAFE TERIA LUNCH to which all are welcome\, departing from Room 1108 about 5 min utes after 12:00 (Noon).\n\nFor further information contact:\nProfessor Chr istopher Jarzynski\, cjarzyns@umd.edu\, (301)405-4439\nProfessor John Weeks \, jdw@umd.edu\, (301)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\ , (301)405-1610. LAST-MODIFIED:20230127T203541Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091203T171500Z DTEND:20091203T181500Z DTSTAMP:20260828T094430Z UID:csujddklicmf7q79knk6h802rg@google.com CREATED:20091015T202921Z DESCRIPTION:Title :Optimizing low Reynolds number locomotion\nSpeaker Name : Peko Hosei\nSpeaker Institution : Dept of Mechanical Engineering\, MIT\n LAST-MODIFIED:20230127T203046Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221020T180000Z DTEND:20221020T193000Z DTSTAMP:20260828T094430Z UID:2br4e0qqc7h7dqe4v53rf07lpa@google.com CREATED:20221004T135437Z DESCRIPTION:Speaker: Yushan Su\, UMD


    Title: To wards Precision Calculations of the Proton's PDFs

    Abstract:The proton's parton distribution functions (PDFs) are important physical quantities useful in searches of New Physics at LHC as well as in understan ding the proton internal structure. Different methods have been developed t o calculate them from first principles in lattice QCD\, including  \;mo ments from matrix elements of local operators\, coordinate space correlatio ns through short-distance OPE\,  \;and direct calculations in large mom entum effective theory. In this talk\, I compare different methods and poin t out the importance of the lattice discretization effect in coordinate spa ce correlations caused by the non-commuting limits between a->\;0 and z-& gt\;0. After correcting this and other important effects\, we obtain the mo st precise prediction on the x-dependence of the proton's isovector PDF in the mid-x region from lattice data\, which will be compared with the global fit from experimental data.     LAST-MODIFIED:20221018T132959Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221103T180000Z DTEND:20221103T193000Z DTSTAMP:20260828T094430Z UID:4a5275en9v3em5kgihai77v87a@google.com CREATED:20221004T140719Z DESCRIPTION:Speaker: Dean Lee\, Michigan State University

    Title: New quantum algorithms for quantum many body systems

    Abstract: Several new quantum algorithms will be discussed that are useful for studying the properties of quantum \;many body systems. \; The first is the rodeo algorithm\, which is a stochastic method for quantum sta te \;preparation and spectrum determination using iterated measurements . \; In connection with the rodeo
    algorithm\, I discuss controlled r eversal gates\, transition matrix element calculations\, and connections to
    classical calculations using nuclear lattice effective field theory.&nb sp\;
     LAST-MODIFIED:20221025T172916Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081203T203000Z DTEND:20081203T213000Z DTSTAMP:20260828T094430Z UID:lk8575egoom4p97via33dagds0@google.com CREATED:20081121T162115Z DESCRIPTION:Title: The New Iron-arsenide Superconductors\nSpeaker: Dr. John pierre Paglione\, Center for Nanophysics and Advanced Materials\, Departmen t of Physics\, University of Maryland LAST-MODIFIED:20230127T203621Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110509T200000Z DTEND:20110509T213000Z DTSTAMP:20260828T094430Z UID:d1imlso2gdgtvkrm0isnc9grco@google.com CREATED:20110503T140013Z DESCRIPTION:Title : Single-Molecule Dynamics and Coupled Binding-Folding of Intrinsically Disordered Proteins.\nSpeaker Name: Dr. Ashok Deniz\nSpeaker Institution : Scripps Institute\nNotes: Refreshments served at 3:45pm\n LAST-MODIFIED:20230127T203401Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230130T160000Z DTEND:20230130T170000Z DTSTAMP:20260828T094430Z UID:4h187an8mc0ubo75revonrdvk4@google.com CREATED:20221115T172837Z DESCRIPTION:Speaker: Nathan Schine (UMD)

    Title: Entanglement and mea surement in atom arrays

    Abstract: Arrays of neutral atoms prom ise to enable a variety of experiments across quantum science\, including q uantum information processing\, metrology\, and many-body physics. While th ere have been recent significant improvements in quantum control\, coherenc e times\, and entanglement generation\, one outstanding limitation is the e fficient implementation of dissipation or measurement. An exciting possibil ity to overcome this challenge involves the integration of the atom array w ith an optical cavity\, whereby strong coupling between atoms and light ena bles fast programmable mid-circuit measurement. Beyond quantum information processing applications (e.g. error correcting codes)\, engineered dissipat ion in interacting quantum systems opens the door to autonomous stabilizati on of many-body states as well as studies of measurement induced entangleme nt transitions. LAST-MODIFIED:20230125T211947Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar: Nathan Schine (UMD) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081104T210000Z DTEND:20081104T220000Z DTSTAMP:20260828T094430Z UID:p13okj5j43pk347sorfjnv5j7s@google.com CREATED:20080915T190359Z DESCRIPTION:Speaker:Charles Meade\, RAND Corporation\nTitle:"Physics and Fu ture Challenges in Public Policy"\n LAST-MODIFIED:20230127T203130Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221115T160000Z DTEND:20221115T170000Z DTSTAMP:20260828T094430Z UID:6u2qf6akapkbuu1mi2qfr1f973@google.com CREATED:20220815T165220Z DESCRIPTION:Speaker: Dr. Sua Myong\, Johns Hopkins University

    Title: \;    G-quadruplex as a Genetic Switch in Transcrip tion and Translation

    Abstract: \;G-qudruplex (G4) is a noncanonical secondary structure that can form in both DNA and RNA. Human genome contains over 400\,000 potential G4 forming sequences (PQS) and the y are highly enriched in upstream of oncogene promoters and regulatory gene s\, strongly suggesting a switch-like function with programed positioning. Many previous studies have demonstrated the role of G4 in up or downregulat ing genomic processes including replication\, transcription and translation . Our recent study demonstrated that in transcription\, G4 forming sequence located in the non-template strand leads to a robust formation of R-loop ( mRNA annealed to template strand)\, which in turn\, induces G4 structure in the non-template strand. Remarkably\, such R-loop/G4 structure drives enha nced transcription by a mechanism that involves successive formation and re lease of R-loop. Furthermore\, we demonstrate that 5’UTR-G4 bearing mRNA (R G4) leads to over 10-fold enhanced translation in a cell-free system and in e.coli cells. Upon testing several plausible hypotheses\, we propose that the RG4 structure promotes translation by blocking ribosomes from sliding o ff the mRNA. Our study reveals the structure-function relationship of how G 4 and R-loop regulates transcription and translation activity. \; LAST-MODIFIED:20221110T230206Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220922T150000Z DTEND:20220922T160000Z DTSTAMP:20260828T094430Z UID:7pjccbdjeeg2v4vl8kmv8fqbo7@google.com CREATED:20220804T135937Z DESCRIPTION:Speaker: Dr. Dong-Sheng Guo\, Nankai University
    < br>Title: Calixarenes: From Macrocyclic Receptors to Supramolecular Biomedi cal Materials     LAST-MODIFIED:20220915T143333Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101007T140000 DTEND;TZID=America/New_York:20101007T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20101007T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Time-dependent Stability in d-Plutonium: thermodynamic and irradiation-induced phenomena"\n[Speaker] Jason Jeffries\n[Institution ] Lawrence Livermore National Laboratory\n[Abstract] Plutonium and its allo ys are of critical importance to nuclear applications\, protecting our nati onal security through deterrence as well as the promise of energy security. Plutonium\, though\, is wrought with technical and scientific conundrums\; for instance\, metallic Pu exhibits six solid allotropes between room temp erature and its very low melting temperature of about 640 °C. Some of the f oremost concerns with Pu alloys and compounds are thus their mechanical and phase stability: what conditions can elicit detrimental changes in the mat erial properties\, and how likely are these conditions to be met within an operating environment? While the ductile\, d-phase (face-centered-cubic) of Pu—normally stable only between 315 °C and 460 °C—can be retained at room temperature by the addition of small amounts of Ga\, that room-temperature d-Pu is only metastable. This metastable phase constantly experiences a the rmodynamic driving force for eutectoid decomposition as well as a Ga-depend ent tendency to undergo an incomplete martensitic phase transformation. In addition\, Pu endures continual self-irradiation\, which can have dramatic consequences on physical properties. Thus\, Pu-based materials suffer from multiple aging phenomena driven by thermodynamic concerns as well as those of self-irradiation. Understanding how these two mechanisms determine the s tability of a radiological material is paramount in evaluating the conseque nces of material aging. Herein\, I will discuss experiments examining each facet of Pu aging: the thermodynamically driven martensitic tranformation a nd the irradiation-induced evolution of inert He bubbles.\n[Note] Refreshme nt is served at 1:30pm in room 1305F (new Toll Room). LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220929T150000Z DTEND:20220929T160000Z DTSTAMP:20260828T094430Z UID:0rkmqidapnsptj8tnjp5qv2dlm@google.com CREATED:20220804T154256Z DESCRIPTION:Speaker: Dr. David MacMillan\, Princeton University< br>
    Title: The Discovery and Invention of New Chemical Reactions Using P hotoredox Catalysis     LAST-MODIFIED:20220926T135510Z LOCATION:Chemistry Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090506T170000Z DTEND:20090506T190000Z DTSTAMP:20260828T094430Z UID:j1tvf9btvh8d2e1vgtbabehq0o@google.com CREATED:20090427T151738Z DESCRIPTION:Title: Large N Phase Transitions Under Scaling\nSpeaker: Herber t Neuberger\, Rutgers - State University of New Jersey\nMore Information: \ nIn pure SU(N) gauge theory in various dimensions\, the collective \nbehavi or of the eigenvalues of a Wilson loop matrix becomes nonanalytic at a spec ific scale in the infinite N limit. At finite but large N\, as a loop is sc aled up uniformly\, the eigenvalues evolve from a perturbative regime to a non-perturbative one. These two regimes are separated by a universal\, nar row\, crossover. LAST-MODIFIED:20230127T203801Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130124T183000Z DTEND:20130124T190000Z DTSTAMP:20260828T094430Z UID:qs5iu167r9krh2m9ug5i2lc2a4@google.com CREATED:20130122T180248Z LAST-MODIFIED:20230127T203653Z LOCATION:Physics Rm 1305F\, The "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080930T200000Z DTEND:20080930T210000Z DTSTAMP:20260828T094430Z UID:qaekab4ndb0jl93b5kehuuhbo8@google.com CREATED:20080912T165329Z DESCRIPTION:Speaker:Haiyan Gao\, Duke University\nTitle:"A New Search on Ne utron Electric Dipole Moment (nEDM)"\n LAST-MODIFIED:20230127T203913Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121211T210000Z DTEND:20121211T220000Z DTSTAMP:20260828T094430Z UID:99v4nnrbln3jjl3gct2v8lt7a8@google.com CREATED:20121206T161903Z DESCRIPTION:Title: The Large Synoptic Survey Telescope (LSST)\n\nSpeaker: S teven M. Kahn\, Stanford University and SLAC National Accelerator Laborator y\n\nAbstract: LSST is a large-aperture\, wide-field\, ground-based telesco pe designed to provide an imaging survey of half the sky in six optical col ors every few nights. As such\, it will enable a diverse array of distinct scientific investigations\, ranging from compiling a census of moving objec ts in the solar system to charting the formation and structure of the Milky Way galaxy. Of particular interest for cosmology and fundamental physics\, LSST will provide tight constraints on the expansion history of the univer se via statistical measurements of the shapes and distributions of billions of galaxies out to moderate-to-high redshifts. In view of these capabiliti es\, LSST was ranked as the highest priority major new ground-based facilit y by the 2010 decadal survey in astronomy and astrophysics commissioned by the National Research Council. I will review the key aspects of the design of this facility and highlight some of its scientific potential\, with part icular emphasis on the power of LSST to constrain the properties of dark en ergy. LAST-MODIFIED:20230127T203210Z LOCATION:Physics 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221129T160000Z DTEND:20221129T170000Z DTSTAMP:20260828T094430Z UID:38qib6oe8cptfg3g107v19iptu@google.com CREATED:20221004T184017Z DESCRIPTION:When: November 29th at 11am
    Where: ATL 4402
    Speaker: Dr. Michael Gullans (UMD)
    Title:  \;Error Mitigation Thresholds in Noisy Quantum Circuits
    Abstra ct: \;    Noise in quantum devices can be correc ted with quantum error correction or it can be mitigated via classical post -processing. \; The latter can be done with negligible overhead in the space-time volume of the quantum circuit\, but will generally incur exponen tial overhead in sampling complexity. \; We use statistical-mechanical arguments to discuss the limits of error mitigation in quantum circuits.&nb sp\; We show that noisy random quantum circuit models with imperfectly char acterized noise remain robust to imperfections at a finite rate of disorder \, before exhibiting a disorder-driven error mitigation threshold. \; B ased on Imry-Ma arguments\, we conjecture that this transition is in the sa me universality class as the classical random field Ising model in D+1 dime nsion for D>\;1 spatial dimensions of the qubits. \; Our results are based on a replica analysis of statistical mechanics models for noisy rando m circuits\, as well as numerical simulations of error mitigated noisy quan tum circuits. \; We discuss the implications of our results for quantum algorithms and tests of quantum computational advantage in near-term devic es.

    Joint work with Pradeep Niroula and Sarang Gopalakrishnan . LAST-MODIFIED:20221121T142805Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221117T190000Z DTEND:20221117T203000Z DTSTAMP:20260828T094430Z UID:4hmi7reck6ajqen58e6e82ugka@google.com CREATED:20221020T144707Z DESCRIPTION:Title: \;Adsorption and sepa rations processes within metal-organic frameworks through neutron scatterin g

    Abstract: \;Metal organic frameworks (MOFs) are c rystalline materials that contain metal-ions or metal-ion clusters as nodes and organic ligands as linkers to form 1-\, 2-\, and 3-D structures. Their structural versatility and multifunctional properties have sparked much in terest in advanced materials synthesis. Due to their modular nature\, many of these materials can be constructed by design. Over the last decade there are several MOFs that reportedly have high surface areas allowing them to physically adsorb significant amounts of gas and/or exhibit significant sep arations performance. Adsorption of molecules in functionalized and high su rface area microporous materials is of technological importance in a multit ude of areas ranging from catalysis\, drug delivery\, < /span>chemical separations\, and energy storage to personal ca re products. Through careful selection of the ligand and metal\, which cont rol pore size/shape and MOF-adsorbate interactions\, their uptake propertie s can be tuned. Over the past several years we have focused our research ef forts on understanding the properties of gas interactions within a variety of microporous materials with the goal of improving new optimal storage and separation materials.

    Host: Nick Butch
     \;
    Locatio n: Toll Physics Rm 1201

    Seminar also on Zoom
    Meeting \;Link:& nbsp\; \;https://umd.zoo m.us/j/91301075848

    Refreshments 1:30pm 1 117 Toll Physics Bldg.     LAST-MODIFIED:20221114T194449Z LOCATION:1201 John S. Toll Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Craig Brown\, NIST Center for Neutron Research TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Nov 17_Craig Brown.pdf;FMTTYPE=application/p df:https://drive.google.com/open?id=12H1zU4rvqIkEFysjkOhxDhS5jnXPvXlw&authu ser=0 END:VEVENT BEGIN:VEVENT DTSTART:20101110T210000Z DTEND:20101110T223000Z DTSTAMP:20260828T094430Z UID:bob58mdfgefmjlt2fqnmt28lmk@google.com CREATED:20101108T163519Z DESCRIPTION:Title : Results from the ANITA Search for Ultra-High Energy Neu trinos\nSpeaker Name: Dr. Abigail Vieregg\nSpeaker Institution : Harvard Un iversity LAST-MODIFIED:20230127T203009Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121001T203000Z DTEND:20121001T213000Z DTSTAMP:20260828T094430Z UID:1msoviu6evh8akiijq35qb4lfc@google.com CREATED:20120821T133607Z DESCRIPTION:Speaker Name: Peter Kollmann\n\nSpeaker Institution : Johns Hop kins University Applied Physics Laboratory\n\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM\n LAST-MODIFIED:20230127T203900Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100528T090000 DTEND;TZID=America/New_York:20100528T130000 DTSTAMP:20260828T094430Z UID:ac6s85q9evkm1t16pvhn9b9nns@google.com RECURRENCE-ID;TZID=America/New_York:20100528T090000 CREATED:00010101T000000Z DESCRIPTION:The Maryland Center for Fundamental Physics is hosting and co-s ponsoring a workshop on Advances in Theoretical and Observational Cosmology \, May 26-28\, 2010. It will take place in the John S. Toll Physics Buildi ng.\nThe flood of new observations and theoretical advances continues in th e field of cosmology. This workshop aims to bring together a medium-sized group of researchers leading in these recent results\, including advances i n particle cosmology\, theoretical and observational particle astrophysics\ , and observational cosmology at all wavelengths. LAST-MODIFIED:20230127T203027Z LOCATION:Room 1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:MCFP Workshop on Advances in Theoretical and Observational Cosmolog y TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120503T233000Z DTEND:20120504T003000Z DTSTAMP:20260828T094430Z UID:gd7ej2ihioq8cg7ne9lc99dk68@google.com CREATED:20110818T204013Z DESCRIPTION:A collection of our best demonstrations\, including the mysteri ous psychoacoustic vibration transducer\, the lovely laser waterfall\, and the infamous “eight ways to smash a can.” Vote for your favorite! \n\nDoors open 7:00PM\nFor directions and further information call 301-405-6045 or v isit www.physics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203626Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Greatest Hits of Physics Demonstrations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090324T180000Z DTEND:20090324T190000Z DTSTAMP:20260828T094430Z UID:rm72r9ikps25a04qbboa8nocpg@google.com CREATED:20090318T165323Z DESCRIPTION:Title: Teaching Physics in Africa\nSpeaker: Dr. David Noyes LAST-MODIFIED:20230127T203814Z LOCATION:1201 Physics SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Special Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120416T163000Z DTEND:20120416T173000Z DTSTAMP:20260828T094430Z UID:erklpjm2da4enala9ace4qjtq4@google.com CREATED:20120405T143129Z DESCRIPTION:Title: From atomic Rydberg reservoirs for polar molecules to q uantum simulation of lattice gauge theories with cold atoms\nSpeaker: Peter Zoller\, Institute for Theoretical Physics\, University of Innsbruck\, and Institute for Quantum Optics and Quantum Information of the Austrian Acade my of Sciences\, Innsbruck\, Austria\nAbstract: I will discuss two topics o f ongoing research on cold atoms and molecules in Innsbruck. In the first p art of my talk I will discuss laser dressed dipolar and Van der Waals inter actions between atoms and polar molecules\, so that a cold atomic gas with laser admixed Rydberg levels acts as an engineered reservoir for both elast ic and inelastic collisional processes. In the second part I will present o ngoing work on quantum simulation of dynamical gauge fields with cold atoms within so-called quantum link models.\n LAST-MODIFIED:20230127T203028Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Peter Zoller TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131213T190000Z DTEND:20131213T200000Z DTSTAMP:20260828T094430Z UID:nkdqg3rhba3lt11d26tr74lfcs@google.com CREATED:20130916T194642Z DESCRIPTION:Title : X-ray imaging with space detectors based on the moiré e ffect\nSpeaker Name: Diego Casadei\nSpeaker Institution : University of App lied Science of North-West Switzerland\n\nNotes: NOTICE DATE/DAY/TIME CHANG E FRIDAY @ 2:00PM.\nCoffee\, Tea & Cookies 1:45-2:00 PM\n\nAbstract : X-ray astronomy is a powerful source of information about astrophysical sources\ , as X-rays are emitted by accelerated electrons and excited ions. Hence X- rays give us indirect information about the morphology and power of the sou rce. In addition\, the continuum emission from accelerated electrons reveal s the characteristics of important aspects like the magnetic field configur ation in stellar and compact sources\, the expanding shells in supernova re mnants\, the accretion disk of a black hole\, the jet morphology in active galactic nuclei\, etc. Focusing X-ray optics (e.g by grazing incidence mirr ors) is only feasible with long (10-20 m) focal distances. This requires ei ther very long satellites\, or formation flights in which the focusing opti cs is installed on a separate satellite from the one hosting the photon det ectors\, with the need of keeping very accurate and stable alignment and di stance. Hence\, space instruments based on focusing X-ray optics are extrem ely expe nsive. A simpler alternative is to use pairs of absorbing grating s made of high-Z matter\, projecting "shadows" forming characteristic moiré patterns. The image is then reconstructed mathematically\, starting from t he distribution of photons recorded by detectors with coarse (or no) pixeli zation. This technique allows to build compact instruments achieving a very good resolution (of few arcseconds)\, with the drawback of a reduced dynam ic range (two nearby sources are both visible only if one is not fainter th an 1-2 orders of magnitude). The operating space detector with the best res olution is RHESSI. A new detector (STIX) is in construction\, which will be installed on the ESA Solar Orbiter mission (to be launched in 2017). STIX will achieve similar performance as RHESSI with a more compact design. In a ddition\, a new technique promises to make it possible to build gratings wi th period at the micron level\, allowing for X-ray imagers which can fit a small satellite. Work is in progress to develop an X-ray imager which can b e flown on a nanosat ite. \n LAST-MODIFIED:20230127T203240Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101116T230000Z DTEND:20101117T010000Z DTSTAMP:20260828T094430Z UID:q6uqmt8kcd67ojc96obt9b27fo@google.com CREATED:20101111T155715Z DESCRIPTION:Title: "PRESENT AND FUTURE APPLICATIONS OF PHOTON COUNTING LIDA RS"\n\n Speaker: Dr.John J. Degnan\, Chief Scientist\, Sigma Space Corpo ration \n \n \nABSTRACT:\n The first space application of photon-counting lidars occurred shortly after the landing of Apollo 11 on the Moon when var ious scientific groups used lasers to range to retroreflector panels left o n the lunar surface by the astronauts. Because of the great distances invol ved (384\,000 km one-way) and practical limitations on laser energy and tel escope aperture\, the detected signals were necessarily at the single photo n level. The Lunar Laser Ranging (LLR) effort has continued uninterrupted o ver the past four decades and has allowed scientists to study solar system dynamics\, Earth-lunar interactions\, and lunar properties. It has also se rved as a testbed for relativistic theories. Since the mid-1990’s\, the aut hor has applied the photon-counting technique to a number of new lidar appl ications which take advantage of the efficiencies associated with single ph oton ranging. These include: (1) an eyesafe satellite laser ranging system which presently tracks high altitude (up to 20\,000 km) satellites with su b-cm precision at kHz rates with only 60 microjoules of transmitted energy\ ; (2) an airborne\, high resolution 3D imaging lidar which operates day or night and can be readily scaled to globally and contiguously map extraterr estrial moons from 100 km orbits\; (3) an upcoming NASA mission for mappin g the Earth’s surface in 3D from a 600 km orbit\; and (4) interplanetary r anging and time transfer via two-way laser transponders. The presentation provides an overview of photon counting lidars and their exciting applicati ons.\n LAST-MODIFIED:20230127T203701Z LOCATION:Jeong H. Kim Building\, Room 1105 (PEPCO Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Optical Society of America with the U of MD OSA/SPIE Student Chapte r TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081006T180000Z DTEND:20081006T190000Z DTSTAMP:20260828T094430Z UID:0aj21pmplr2s9i0ca0tvcp1gio@google.com CREATED:20080912T171450Z DESCRIPTION:Speaker:Hirotaka Sugawara\, Japan Society for the Promotion of Science\nTitle:"Space-time Duality and Vacuum Energy"\n LAST-MODIFIED:20230127T203015Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090205T210000Z DTEND:20090205T220000Z DTSTAMP:20260828T094430Z UID:4tcm8bv03j13cqgs6iumcja7q8@google.com CREATED:20090202T180802Z DESCRIPTION:Title: Improving Teaching and Learning of Quantum Mechanics \nS peaker: Chandralekha Singh\, Department of Physics and Astronomy\, Universi ty of Pittsburgh LAST-MODIFIED:20230127T203114Z LOCATION:Physics Building\, Room 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PERG Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121025T180000Z DTEND:20121025T193000Z DTSTAMP:20260828T094430Z UID:2qqa8f65j3u1p7mra761puliuo@google.com CREATED:20120919T181934Z DESCRIPTION:Speaker: Yaacov Elkanna Kraus\, Weizmann Institute\n\nTitle:To pological States and Adiabatic Pumping in Quasicrystals\n\nAbstract: The di scovery of topological insulators has sparked considerable interest in the study of topological phases of matter. Yet\, realizations of these phases o f matter are scarce. In this talk we will show\, both theoretically and exp erimentally\, that quasicrystals possess high-dimensional topological phase s. We will demonstrate that 1D quasicrystals exhibit topological propertie s that were\, thus far\, thought to be limited to 2D systems. Using photoni c quasicrystals\, we observe localized boundary states\, which manifest the se topological properties. These states are used to realize an adiabatic op tical pumping. Generalization to various types of quasicrystals and higher dimensions will also be discussed.\n\nHost: David Abergel LAST-MODIFIED:20230127T203238Z LOCATION:Room 1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081010T180000Z DTEND:20081010T190000Z DTSTAMP:20260828T094430Z UID:guodokq26hbqjod71oe7qmoqdo@google.com CREATED:20080912T171806Z DESCRIPTION:Speaker:Abraham Loeb\, Harvard University\nTitle:"Exploring New Physics in the Early Universe and Around Black Holes"\n LAST-MODIFIED:20230127T203526Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MARYLAND CENTER FOR FUNDAMENTAL PHYSICS COLLOQUIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111129T190000Z DTEND:20111129T200000Z DTSTAMP:20260828T094430Z UID:a66u9a201aq8itcp6dfvlm038k@google.com CREATED:20111102T200738Z DESCRIPTION:Title: "Leptogenesis and Future Experiments"\nSpeaker: Boris Ka yser\nInstitution: Fermilab\nAbstract: We will discuss the standard version of leptogenesis\, and argue that the CP violation that drives it\, and CP violation in neutrino physics experiments\, are generically related: If one of these CP violations occurs\, then very likely so does the other one. Ou r discussion of the neutrino experiments will include a new treatment of th e quantum mechanics of neutrino oscillation. Then we will introduce a non-s tandard model of leptogenesis in which the heavy neutrinos on which leptoge nesis depends are light enough to be discovered at the LHC. \n LAST-MODIFIED:20230127T203751Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101028T200000Z DTEND:20101028T210000Z DTSTAMP:20260828T094430Z UID:rv2hg9vkc61b0fc8jr1triea50@google.com CREATED:20101013T143345Z DESCRIPTION:CHEMICAL DEMONSTRATIONS THAT YOU\nALWAYS WANTED TO SEE\nEnterta ining\, Spectacular\, Surprising\nGASES\ncalm\, violent\, mysterious\nIn a Return Performance by Professor Dr.\nHenri Brunner of the University of\nRe gensburg in Germany\n(assisted by Maxim Ratnikov)\nThursday\, October 28 at 4:00 LAST-MODIFIED:20230127T203555Z LOCATION:Room 1407 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100304T190000Z DTEND:20100304T203000Z DTSTAMP:20260828T094430Z UID:geaadhqin39us8292v2op59ua0@google.com CREATED:20100219T164855Z DESCRIPTION:[Speaker] Roman Lutchyn\n[Institution] University of Maryland\n [Title] Topological phases of matter and Majorana fermions\n[Abstract] Expl oration of topological phases of matter is one of the main challenges in c ondensed matter physics. Among the exciting recent \ndevelopments are the discoveries of the new phases of matter with many intriguing properties - topological insulators and topological superconductors. The hallmark of top ologically non-trivial phases is the presence of an exotic quantum entangl ement in their wave functions\, which leads to the existence of the robust edge/surface \nstates and zero-energy modes that can be occupied by Majora na fermions. Majorana fermions correspond to the particles that are\, at th e same time\, their own antiparticles. Despite being first predicted by E. Majorana in 1930s\, there is still no conclusive evidence of their existenc e. If found\, Majorana fermions would constitute a key \nbuilding block for the implementation of the fault-tolerant topological quantum computation s chemes that are inherently decoherence-free.\n\nIn my talk\, I will discuss solid-state architectures suitable for topological quantum computation and review recent progress in strontium ruthenates\, heterostructures between a topological insulator/ \ns-wave superconductor and a semiconductor with s trong spin-orbit interactions/s-wave superconductor. I will argue that the proposals based on the superconducting proximity effect are among the most promising ones for observing Majorana physics in the laboratory.\n\n[Note] Refreshment is serviced at 1:30pm in the Toll Room LAST-MODIFIED:20230127T203732Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100416T170000Z DTEND:20100416T180000Z DTSTAMP:20260828T094430Z UID:f51olpind8lp1mtm56dvqn1mng@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100310T205501Z DESCRIPTION:[Speaker] Luciano Rezzolla\n[Institution] Albert Einstein Inst itute \n[Title] "Modeling the inspiral and merger of binary neutron stars" \n[Abstract] Investigating the final evolution of neutron star binaries pro mises to be particularly rewarding. These systems are in fact excellent sou rces of gravitational waves\, they are thought to be behind the powerful en gines powering short gamma-ray bursts\, and they can unveil the behaviour o f matter at extreme densities and temperatures. I will review the present u nderstanding in the modeling of the inspiral and merger of binary neutron s tars in full general relativity\, underlining the considerable recent progr ess both in hydrodynamics and in MHD. Finally\, I will discuss the steps th at still need to be taken to use this progress to model the central engine of short gamma-ray bursts. LAST-MODIFIED:20230127T203445Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090219T203000Z DTEND:20090219T223000Z DTSTAMP:20260828T094430Z UID:vcttvemb3ggsdfabq08q04ace0@google.com CREATED:20090202T175119Z DESCRIPTION:Title: Smooth pressure and Lyapunov spectra for unimodal maps \ nSpeaker: Mike Todd\, Faculdade de Ciências da Universidade do Porto LAST-MODIFIED:20230127T203315Z LOCATION:Math Building\, Room 1311 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dynamical Systems Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221130T160000Z DTEND:20221130T170000Z DTSTAMP:20260828T094430Z UID:0b7suigc13pqm5k6d6col1lso6@google.com CREATED:20220804T155543Z DESCRIPTION:Speaker: Dr. Kit Bowen\, Johns Hopkins University

    Title: \;    Electron-Induced Proton-Transfer (EIPT) and i ts Role in the Formation of Solvated Electrons

    Abstract: \;This presentation will explore the possible role of electron-induced proton-transfer (EIPT) in the formation of solvated electrons and in partic ular in the formation of ammonia cluster anions as embryonic ammoniated ele ctrons. The experimental method employed in this work is negative ion photo electron spectroscopy. LAST-MODIFIED:20221128T162104Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221130T203000Z DTEND:20221130T213000Z DTSTAMP:20260828T094430Z UID:7uhj2chcr38u98lmmv6858a26d@google.com CREATED:20221118T135547Z DESCRIPTION:
    < p>Title : Laboratory Study of Residual Energy Generation in Strong Alfven W ave Interactions

    Speaker Name: Mel Abler\, \; Space Science Ins titute


    Abstract : The solar wind is a classic example of a turb ulent plasma. At moderate scales (larger than ion-kinetic scales) turbulent fluctuations in the solar wind are often Alfvenic in character\, meaning t hat their magnetic and flow velocity fluctuations are proportional to each other. However\, observations of the solar wind have shown that there is a significant difference in the energy in the velocity fluctuations and the n ormalized magnetic field fluctuations. This difference\, called the residua l energy\, should be zero for linear Alfven waves\, but is consistently obs erved to be negative in the solar wind\, with magnetic fluctuations dominat ing. This work investigates the energy partition of strong three-wave inter actions as a building block of interactions in the
    turbulent cascade. Pr eliminary results from an experimental campaign
    on LAPD studying three-w ave interactions of Alfven waves in an
    MHD-like regime will be presented .


    swisdak@umd.edu \;

    LAST-MODIFIED:20221118T135547Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130717T190000Z DTEND:20130717T210000Z DTSTAMP:20260828T094430Z UID:v7tbkprmqbuicrub0tv9thk7b4@google.com CREATED:20130712T133432Z DESCRIPTION:Title: A nearby ordinary monster - an afternoon to discuss GRB 130427A\nSpeaker: \nAbstract: Just over two months ago\, on April 27\, Fer mi and Swift triggered on an extraordinarily bright gamma-ray burst. There are an exceptionally complete set of observations of this burst from early times (i.e. the explosion) to late afterglow\, from radio to TeV gamma-ray photons and high energy neutrinos. These are providing us with a remarkable opportunity to challenge standard GRB paradigms. More than 5 papers have b een submitted on this burst\, and more are coming\, so this is a fresh and exciting topic. We'd like to take the opportunity to get together and discu ss what has been seen and what it means.\n\nThis special Joint Space-Scienc e Institute (JSI) event will be on campus in CSS 2400 from 3-5pm on July 17 with a sequence of 7 short talks covering Fermi\, Swift\, NuSTAR\, RAPTOR\ , IceCube\, HAWC\, other afterglow observations and theory and context.\nWe 'll go out for happy hour somewhere locally afterwards.\nAll are all welcom e and encouraged to come and join in.\n LAST-MODIFIED:20230127T203705Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:7 Short Talks covering Fermi\, Swift\, NuSTAR\, RAPTOR\, IceCube\, HAWC\, other afterglow observations and theory and context TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100303T173000Z DTEND:20100303T183000Z DTSTAMP:20260828T094430Z UID:v1iaf8n9n3isa3i6qj9upokg08@google.com CREATED:20100218T192327Z DESCRIPTION:SPEAKER: Dean J. Lee\n\nAFFILIATION: N. Carolina State Univ.\, Raleigh\n\nTITLE: Lattice Calculations of Neutron Matter and Nuclei Using Effective Field Theory\n\nABSTRACT: Effective field theory is a systemati c approach to interacting quantum systems at low energies and densities whi ch is based upon an expansion in powers of the particle momenta. Lattice e ffective field theory\ncombines this approach with numerical lattice method s. I discuss the application of lattice effective field theory to the calc ulation of neutron matter and nuclei\, specifically 2H\, 3H\, 3He\, \n4He\, 6Li\, and 12C. LAST-MODIFIED:20230127T203838Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221011T150000Z DTEND:20221011T160000Z DTSTAMP:20260828T094430Z UID:56vbol4cs0p5lclf54h2a7jn98@google.com CREATED:20220815T164747Z DESCRIPTION:Literature Seminar: Daniel Birtles\, UMCP

    Tit le: \;    How a Cryptic Agonist Regulates Adhesion G PCR Activity


    Abstract: \ ;https://chem.umd.edu/events/how-cryptic-agonist-regulates-adhesion-gpcr-a ctivity LAST-MODIFIED:20221011T164419Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091209T210000Z DTEND:20091209T220000Z DTSTAMP:20260828T094430Z UID:g2dh40opggphkapsghhhgel8ec@google.com CREATED:20091124T165358Z DESCRIPTION:Title : Experimental Evidence for MHD Plasma Centrifugal Confin ement in Open Magnetic Field Configuration\nSpeaker Name: Dr. Catalin Teodo rescu\nSpeaker Institution : IREAP\nAbstract : In the Maryland Centrifugal Experiment\, the plasma is created in a shaped open-field magnetic configur ation. Plasma rotation perpendicular to the magnetic field at supersonic sp eeds is controlled by an externally-applied E x B drift. This work document s the centrifugal confinement effect produced by the plasma rotation from i nterferometric measurements of plasma density at the magnetic minimum (midp lane) and 85 cm off-midplane. Complete time histories of density at these t wo locations are obtained and compared to deduce the efficacy of axial conf inement. Other key parameters are also directly measured simultaneously at midplane (rotation velocity profiles\, ion temperature\, and diamagnetic fl ux) and off-midplane (diamagnetic flux). The observed scaling of the averag e density ratio at midplane and off-midplane is obtained as a function of t he shape of the magnetic field (mirror ratio) and the data are compared wit h the MHD (Grad-Shafranov equation) solution of the c!\n\nentrifugally conf ined density. The theory depends on the sonic Mach number and mirror ratio and the data are shown to be in agreement with the predictions of the ideal MHD equilibrium theory.\n LAST-MODIFIED:20230127T203029Z LOCATION:Energy Research Bldg\, #223 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120924T154500Z DTEND:20120924T163000Z DTSTAMP:20260828T094430Z UID:9cqgsaoouhctutgc104vmm2r14@google.com CREATED:20120919T183554Z LAST-MODIFIED:20230127T203448Z LOCATION:Physics\, 1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131031T173000Z DTEND:20131031T180000Z DTSTAMP:20260828T094430Z UID:j3jsrfphjjuf69jsc89n9115ec@google.com CREATED:20131024T150216Z LAST-MODIFIED:20230127T203400Z LOCATION:Physics room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110225T160000Z DTEND:20110225T170000Z DTSTAMP:20260828T094430Z UID:m9squiors8e4ejk8ac4if4ptms@google.com CREATED:20110216T142650Z DESCRIPTION:Bioengineering Seminar Series: Jessica Ramella-Roman (This eve nt has no end time in the Engineering Calendar. An hour long event duration has been set to work with Google Calendar.) LAST-MODIFIED:20230127T203222Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bioengineering Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100126T160000 DTEND;TZID=America/New_York:20100126T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20100511T200000Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com CREATED:20100115T170209Z DESCRIPTION:Speaker: Victor Yakovenko\, University of Maryland\nTitle: "New Developments in Statistical Mechanics of Money\, Income\, and Wealth"\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120215T190000Z DTEND:20120215T200000Z DTSTAMP:20260828T094430Z UID:100er1r418m6nt33213vp61slk@google.com CREATED:20120206T190719Z DESCRIPTION:SPEAKER: Jozef Dudek\, Jefferson Lab and Old Dominion Univ\, V irginia\nTITLE: Gluonic Excitations in QCD\nABSTRACT: I will present rece nt progress in applying lattice methods\nto the study of the spectrum of ha drons in QCD. Particular emphasis\nwill be placed upon the gluonic excitati ons sector\, where for the\nfirst time we believe we have determined the lo w-lying spectrum of\nhybrid mesons and baryons. A simple phenomenology for the lowest lying\ngluonic excitations is suggested.\n LAST-MODIFIED:20230127T203908Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110502T200000Z DTEND:20110502T210000Z DTSTAMP:20260828T094430Z UID:judemues1hjdvolc74eg2jd4eg@google.com CREATED:20110427T144957Z DESCRIPTION:Speaker: Douglas Scalapino\, University of California\, Santa B arbara\nTitle: "The high Tc cuprates\, the Hubbard Model and the pairing i nteraction"\nAbstract:\nIn this seminar I will review some of the propertie s of the Hubbard model that remind one of the high Tc cuprates and discuss what is known about the pairing interaction in this model. I will argue : ( 1) The Hubbard model contains enough of the basic physics that it is of in terest to understand the structure of the pairing interaction in this parti cular model. (2) There is a pairing "glue" in the Hubbard model and that th e spin\, momentum and frequency dependence of the pairing interaction suppo rt a picture in which this pairing glue arises from the exchange of antife rromagnetic spin-fluctuations. LAST-MODIFIED:20230127T203705Z LOCATION:Room 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Special CNAM Symposium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101109T210000Z DTEND:20101109T220000Z DTSTAMP:20260828T094430Z UID:4gcvakrlttkerruv7ehaldgkr0@google.com CREATED:20100825T175325Z DESCRIPTION:Speaker: Michael B. Einschlag\, Rosenlaw & Einschlag\nTitle: Ho w Do You Know If Your Technology Includes Patentable Inventions\, and How M any Patents Do You Need To Protect Your Technology LAST-MODIFIED:20230127T203239Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111027T173000Z DTEND:20111027T180000Z DTSTAMP:20260828T094430Z UID:drufm3s239lqfhephvamq1ie6g@google.com CREATED:20110914T204539Z LAST-MODIFIED:20230127T203443Z LOCATION:Rm. 1305F\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131101T190000Z DTEND:20131101T203000Z DTSTAMP:20260828T094430Z UID:34s9pj1hq3nvm1v910treing7c@google.com CREATED:20131023T213410Z DESCRIPTION:Speaker: Leo Singer\, Caltech\, LIGO\, iPTF\n\nTitle: The Need le in the Hundred-Square-Degree Haystack: from Fermi GRBs to LIGO Discoveri es\n\nAbstract: Abstract: LIGO and Virgo are poised to detect gravitational waves (GW) directly for the first time this decade. The ultimate prize wou ld be joint observation of a compact binary merger in both gravitational an d electromagnetic channels. However\, GW sky locations uncertain by hundred s of square degrees will pose a challenge. I will explain how we will promp tly detect GW sources and rapidly estimate their parameters and sky locatio ns within minutes. Having analyzed a comprehensive population of simulated GW sources\, we describe the sky localization accuracy that will be achieve d in the first two years of Advanced LIGO. Next\, in preparation for the op tical search with the intermediate Palomar Transient Factory (iPTF)\, we ar e following up gamma-ray bursts (GRBs) detected by the Fermi Gamma-ray Burs t Monitor. Its comparable error regions offer a close parallel to the Advan ced LIGO problem\, but Fermi's unique access to MeV--GeV photons and its ne arly all-sky coverage may allow us to look at optical afterglows in a relat ively unexplored part of GRB parameter space. We present the discovery of i PTF13bxl\, the optical afterglow of GRB 130702A. Recovered from a targeted survey of 71 square degrees\, it is the first optical afterglow found based solely on a gamma-ray localization. It is also remarkably nearby (z=0.145) \, and its supernova fills in a gap in the GRB--supernova connection. We al so present iPTF13dsw\, the optical afterglow of GRB 131011A\, recovered fro m a similarly sized region but much fainter and further away (z=1.874). iPT F13bxl and iPTF13dsw point toward more afterglow discoveries with iPTF and Fermi. Furthermore\, they set the stage for finding LIGO optical counterpar ts with the Zwicky Transient Facility. LAST-MODIFIED:20230127T203536Z LOCATION:CSS 1255 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Gravity Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221214T160000Z DTEND:20221214T170000Z DTSTAMP:20260828T094430Z UID:2b5dnprbirsgo6o4dhhrkcovts@google.com CREATED:20220927T131936Z LAST-MODIFIED:20220927T131936Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221102T193000Z DTEND:20221102T203000Z DTSTAMP:20260828T094430Z UID:732etu8tgkjb18ceubs8rrf97o@google.com CREATED:20221025T204430Z DESCRIPTION:
    < /td>

    Title : One -dimensional gyrokinetics of an HTS mirror

    Speaker Name: Manaure Fr ancisquez

    Speaker Institution : PPPL

    Abstract : High-temper ature superconducting (HTS) magnetic mirrors under development exploit stro ng fields to compress loss cones and enhance confinement\, and may offer ch eaper\, more compact candidates for fusion power plants. This new class of devices may exhibit largely unexplored interchange and gradient-driven mode s\, which can be studied using gyrokinetics given the strong magnetization and prevalence of kinetic effects. Our present focus is to: a) determine if oft-used gyrokinetic models for open field lines produce the (Pastukhov) e lectrostatic potential confining electrons\; b) examine and address challen ges faced by modern gyrokinetic codes in studying an HTS mirror. We show th at a one-dimensional limit of said models self-consistently develops a pote ntial that meets the analytically-approximated Pastukhov minimum. Additiona lly\, we describe computational challenges of studying HTS mirrors with ope n field line gyrokinetic solvers\, and propose a force-softening technique to mitigate small time steps needed by time integration in colossal magneti c field gradients produced by HTS coils. Force-softening attains speed ups of 16X.



    swisdak@umd.edu \;

    LAST-MODIFIED:20221025T204430Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221205T200000Z DTEND:20221205T213000Z DTSTAMP:20260828T094430Z UID:1o6kbb10m53ohg0kaedacarr3v@google.com CREATED:20220823T192019Z DESCRIPTION:Speaker: Jedidiah Thompson\, Stanford

    Title: Highly-visible coupled axions and implications for direct and indirect dete ction

     \;

    Abstract: A generic low-energy prediction of st ring theory is the existence of a large collection of axions commonly known as a string axiverse. In a realistic axiverse\, string axions can be distr ibuted densely over many orders of magnitude of mass\, and are expected to interact with one another through a joint potential. I will show that non-l inearities in this potential lead to a new type of resonant energy transfer between axions with nearby masses. This resonance is not captured by linea rized treatments previously discussed in the literature\, and generically r esults in a transfer of energy density from axions with larger decay consta nts to those with smaller decay constants\, leading to a multitude of late- time signatures. These include enhanced direct detection prospects for a re sonant pair comprising even a small subcomponent of dark matter (DM)\, and boosted small-scale structure if the pair is the majority of DM. Near-futur e iterations of experiments such as ADMX and DM Radio will be sensitive to this scenario\, as will astrophysical probes of DM substructure.
    LAST-MODIFIED:20221202T213058Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230130T200000Z DTEND:20230130T210000Z DTSTAMP:20260828T094430Z UID:4rko0mc2upmeisvve0lbpj0hg1@google.com CREATED:20230120T202519Z DESCRIPTION:Primordial Black Holes: Formation and Statistics
    < /i>
    Speaker Name: Cristiano Germani

    Speaker Institution: Instit ute of Cosmos Sciences\, University of Barcelona

    Abstract: In this talk I will discuss the conditions that might have led large inflationary p erturbations collapsing into (primordial) black holes. I will then discuss how to calculate their statistical abundance.



    jcullina@umd.edu LAST-MODIFIED:20230120T203802Z LOCATION:1136 Physical Sciencs Complex SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110406T200000Z DTEND:20110406T213000Z DTSTAMP:20260828T094430Z UID:51b29e860566v6kp93tn02u1kk@google.com CREATED:20110401T174235Z DESCRIPTION:Title : "Cosmology Probes from Nearby Supernovae to Distant Qua sars"\nSpeaker Name: Dr. Stephen Bailey\nSpeaker Institution : Lawrence Ber keley Lab LAST-MODIFIED:20230127T203038Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081124T150000Z DTEND:20081124T160000Z DTSTAMP:20260828T094430Z UID:g0v0u6nu9571l7r7mrm6bi31ng@google.com CREATED:20081110T163810Z DESCRIPTION:Title: "Ultra-cold Fermions with Attractive Interactions in Opt ical Lattices and Implications for Correlated Systems"\nSpeaker: Chih-Chun Chien\, University of Chicago\nMore Information: For abstract see http://ww w.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20230127T203841Z LOCATION:Physics Building\, Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110511T151500 DTEND;TZID=America/New_York:20110511T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110511T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Does an atom interferometer test the gravitational red shift?"\n[Speaker] Luc Blanchet\n[Institution] Institut d’Astrophysique de Paris\n[Abstract] In a recent paper\, H. Mueller\, A. Peters and S. Chu cla imed that atom interferometry experiments provide a very accurate test of t he gravitational redshift (or Einstein effect). In this seminar we analyze this claim in the framework of general relativity and of different alternat ive theories. We show that the phase difference of the matter wave between the two paths of the interferometer is zero in most theoretical frameworks used to interpret the equivalence principle. We thus conclude that atom int erferometers do not test the redshift. We also show that frameworks which w ould permit this test pose serious problems such as the violation of fundam ental principles of quantum mechanics.\n LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220929T180000Z DTEND:20220929T193000Z DTSTAMP:20260828T094430Z UID:3nmjomidvu0c8ginr4k15e7m7v@google.com CREATED:20220923T120218Z DESCRIPTION:Circuit QED Lattices

    The field of circuit QED has emerged as a rich platform for both quantum computation and quantum simula tion. Lattices of coplanar waveguide (CPW) resonators realize artificial ph otonic materials in the tight-binding limit. Combined with strong qubit-pho ton interactions\, these systems can be used to study dynamical phase trans itions\, many-body phenomena\, and spin models in driven-dissipative system s. I will show that waveguide resonators permit the creation of exotic latt ices\, including lattices in curved spaces\, and lattices with gapped flat bands.


    Seminar also on Zoom
    Meeting \;Link: \; \; https://umd.zoom.us/j/913010 75848


    Refreshments 1:30pm 1117 Toll Physics Bldg. LAST-MODIFIED:20220923T193933Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Alicia J. KOLLÁR TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Sep 29_Alicia Kollar.pdf;FMTTYPE=application /pdf:https://drive.google.com/open?id=1xu07eyQ3bLtRjVnr-29HlZlafpxaG1nv&aut huser=0 END:VEVENT BEGIN:VEVENT DTSTART:20221007T193000Z DTEND:20221007T213000Z DTSTAMP:20260828T094430Z UID:2g6oqbh45fdjun9v567gf07bfp@google.com CREATED:20220825T180126Z DESCRIPTION:Speaker: Dr. Pratyush Tiwary\, UMCP

    Title: \;A Match Made in Heaven? Integrated Theory\, Simulat ions and AI for Enabling Molecular Discovery

    Abstract: \;     The universality of thermodynamics and statis tical mechanics has led to a language comprehensible to chemists\, physicis ts\, materials scientists\, geologists &\; others\, enabling countless s cientific discoveries in diverse fields. \;In the last decade\, a new a rguably common language that everyone seems to speak but no one quite under stands\, has emerged with the advent of artificial intelligence (AI). It is natural to ask if AI can be integrated with the various theoretical and si mulation methods rooted in thermodynamics and statistical mechanics for dis coveries that none of these could achieve individually. It is also natural to ask if chemists\, who are not fundamentally trained in AI\, should trust any of the results obtained using AI or even worse\, theory or computer si mulations that were guided by AI. \;In this colloquium I will show how such an integration of disciplines can be attained\, creating trustable\, r obust AI frameworks for use by chemists and physical scientists. I will tal k about such methods developed by my group using and extending different fl avors of AI [1-3]. I will demonstrate the methods on different problems fro m proteins\, RNA\, crystal nucleation [4-5]\, where we predict mechanisms&n bsp\;at \;timescales much longer than milliseconds while keeping all-at om/femtosecond resolution. I will conclude with an outlook for future chall enges and opportunities\, envisioning a new sub-discipline of “Artificial C hemical Intelligence” where chemistry (both theory and simulations) move ha nd-in-hand with AI to enable smart molecular discovery.

    [1] Wang\, Ribeiro\, Tiwary. \;Nature Comm \;10\, 3573 (2019).

    [2] Tsai \, Kuo\, Tiwary. \;Nature Comm \;11\, 5115 (2020).

    [3] Wang\, Herron\, Tiwary. \;Proc Natl Acad Sci \;119\, e2203656119 (2022).< /p>

    [4] Wang\, Parmar\, Schneekloth\, Tiwary. \;ACS Central Science&n bsp\;8\, 741 (2022).

    [5] Shekhar\, Smith\, Seeliger\, Tiwary. \;A ngewandte Chemie \;61\, e202200983 (2022).

    LAST-MODIFIED:20221004T142832Z LOCATION:CHEM Bldg.\, Rm. 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110421T113000 DTEND;TZID=America/New_York:20110421T123000 DTSTAMP:20260828T094430Z UID:tccpsv8eudbavhddlpmpkul6rk@google.com RECURRENCE-ID;TZID=America/New_York:20110421T113000 CREATED:20110317T150721Z DESCRIPTION:Topic: "Constraints on Warm Dark Matter from the Local Group of Galaxies"\nPaper Ref.: arXiv:1004.1459\nPresenter: Emil Polisensky (UMD) LAST-MODIFIED:20230127T203703Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221101T150000Z DTEND:20221101T160000Z DTSTAMP:20260828T094430Z UID:5tr9355ttmosbo3e9nfsb7dbg0@google.com CREATED:20220815T165031Z DESCRIPTION:Speaker: Dr. Jacqueline Smith\, Bowie State Universi ty

    Title: \;    Synthesis of Novel VCP Inhibitors Throug h a Microwave-assisted Multicomponent Reaction with Acyclic Amidines

    Abstract: \;Valosine-Containing Protein (VCP) is an ATPase shown to be upregulated in resistant breast cancer. A variety of heterocycl ic small molecules have been shown to be inhibitors of VCP. However\, mutat ions in the VCP binding site of the most efficient inhibitors have been obs erved. Using intelligent drug design\, we predict that trisubstituted imida zoles will act as inhibitors of VCP. In order to access these imidazoles\, we have expanded the Groebke-Blackburn-Bienayme’ Reaction (GBBR) to include acyclic amidines. Aromatic amidines have been shown to efficiently produce the trisubstituted ligands known as BITIs and DITIs. With these ligands in hand\, biochemical and cellular assays will be used to assess the effectiv eness of these compounds on VCP. Ultimately these compounds will be tested in resistance cancer mouse models. Future work will be conducted to determi ne the effects of substituents on aromatic amidines. LAST-MODIFIED:20221025T135931Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100304T171500Z DTEND:20100304T181500Z DTSTAMP:20260828T094430Z UID:vgv65dbjr9ketbk6bpsmgq0mhc@google.com CREATED:20100217T145218Z DESCRIPTION:Title: Critical Thresholds in Restricted Dynamics\nSpeaker: Ei tan Tadmor\nCSCAMM\, University of Maryland LAST-MODIFIED:20230127T203738Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminars TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221114T160000Z DTEND:20221114T170000Z DTSTAMP:20260828T094430Z UID:3r4b2k38bad2bcb4jhthfgld0d@google.com CREATED:20220830T164349Z DESCRIPTION:Speaker: Wes Campbell\, UCLA\n\nTitle: Multilevel atoms and mol ecules for quantum information applications \n\nAbstract: While it can be u seful in some cases to abstract away all but 2 levels of the atoms used for quantum computing\, it should not be forgotten that these qubit hosts ofte n have many levels capable of participating in processing tasks. These inc lude long-lived states within hyperfine\, Zeeman\, and electronic-state str ucture in atoms\, but extend to rotational\, vibrational\, and more exotic level landscapes if one considers molecules instead of just atoms. Given t he effectively atom-limited regime in which many (possibly all) atomic proc essors currently operate\, I will pose the question of how can more-flexibl e encodings that utilize beyond-qubit levels improve the computational powe r of these devices. A serious consideration of how large molecules might p lay a role leads to a satisfying connection to Doppler laser cooling that w ill be discussed. LAST-MODIFIED:20221012T182333Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Wes Campbell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221018T150000Z DTEND:20221018T160000Z DTSTAMP:20260828T094430Z UID:6g8s1t4h2g33brbres688uklra@google.com CREATED:20220815T164844Z DESCRIPTION:Speaker: Dr. Stephanie Cologna\, University o f Illinois-Chicago

    Title: \;Mass Spectrometry-based Proteomics and Lipidomics of Niemann-Pick Type C Reveals Disease Markers a nd Novel Insights to Biomolecular Alterations

    Abstract: \;Mass spectrometry-based proteomics and lip idomics are powerful strategies to understand molecular mechanisms associat ed with human disease. Our laboratory studies Niemann-Pick Type C (NPC)\, a fatal\, progressive neurodegenerative disorder that arises due to improper trafficking of cholesterol. As a result of the genetic defects in NPC\, ch olesterol storage is observed in late endosome/lysosome compartments. Subse quently\, a series of downstream events occur including neuroinflammation\, calcium imbalance\, oxidative stress and progressive neuron loss with the disorder being ultimately fatal in the early adulthood years. In an effort to understand pathways associated with the downstream consequences of the g enetic cause of NPC\, we have employed mass spectrometry imaging\, quantita tive proteomics and lipidomics in multiple models of NPC. Studies using the null Npc1 mouse model in our laboratory demonstrated protein changes that occur late in the disease and can be monitored during disease progression. Furthermore\, we were able to use mass spectrometry-imaging of lipids along with untargeted lipidomics and proteomics to demonstrate that phosphoinosi tide lipid homeostasis is altered in NPC. Finally\, we have embarked on inv estigation of altered proteins in cerebrospinal fluid of NPC patients. Thes e studies have provided insight into novel markers of the disease and insig ht into molecular alterations that may lend to mechanisms driving cell deat h. I will share several examples of our bench to bedside approach to reveal markers of NPC disease using mass spectrometry.     LAST-MODIFIED:20221011T165735Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120320T140000Z DTEND:20120320T150000Z DTSTAMP:20260828T094430Z UID:897hcap15bludscjslodmlaldg@google.com CREATED:20120315T151609Z DESCRIPTION:Title: Electron spin decoherence in a polarized nuclear spin ba th\nSpeaker: Ed Barnes\, University of Maryland Physics Department\nAbstrac tThe leading source of decoherence for electron spin qubits in III-V semico nductor quantum dots is the hyperfine interaction between the electron spin and the bath of nuclear spins residing in the dot. It is well known that p olarizing the nuclear spin bath can mitigate this decoherence\, and there h as been much experimental progress in developing techniques to generate bat h polarization. However\, precisely how this polarization enhances decohere nce times is not well understood\, and until now a complete theoretical tre atment of electron spin decoherence in the case of finite polarization has not been developed. We close the gap between experiment and theory by solvi ng the hyperfine decoherence problem for any bath polarization using the ti me-convolutionless master equation. Our nonperturbative\, closed-form solut ion can readily be used to guide spin qubit experiments.\n \nFor more infor mation contact Charlie Tahan\, ctahan@lps.umd.edu LAST-MODIFIED:20230127T203651Z LOCATION:LPS\, downstairs seminar room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091019T190000Z DTEND:20091019T200000Z DTSTAMP:20260828T094430Z UID:rbh0bt0iqpt253eq41c0gklt74@google.com CREATED:20091013T182728Z DESCRIPTION:Title : The Pauli Principle and Noncommutative Spacetimes\nSpea ker Name: A.P. Balachandran\nSpeaker Institution : Syracuse University\nDr. Balachandran will have to leave for the airport right after his talk\, so people who want to talk with him must do it before the talk.\nAbstract : Th e talk briefly reviews noncommutative spacetimes such as the Moyal plane.It is argued that Planck-scale physics implies such noncommutativity.It is th en explained how the Poincare' group acts on these spacetimes using a twist ed 'coproduct'.The latter in turn affects the symmetrisation postulate and shows the possibility of Pauli-forbidden levels and transitions. A concrete calculation for one such transition from the 2s-1s to the 1s-1s level of a n atom ( with all electron spins parallel ) is made.Preliminary estimates o f the scale of noncommutativity are also presented using the available data .\n LAST-MODIFIED:20230127T203836Z LOCATION:PHYS 4102 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar. TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120316T160000Z DTEND:20120316T170000Z DTSTAMP:20260828T094430Z UID:77kft2sbh85dkgchj6q1bn8dvc@google.com CREATED:20120315T151209Z DESCRIPTION:"Enhanced Interaction Between Colloidal Quantum Dots and Photon ic Crystal Cavity"\nShilpi Gupta LAST-MODIFIED:20230127T203308Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Graduate Student Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121019T140000Z DTEND:20121019T150000Z DTSTAMP:20260828T094430Z UID:tn0epmihgck8a66qvr6fd9ig0g@google.com CREATED:20121005T172110Z DESCRIPTION:Title: Directed Evolution Strategies for Cellular and Metabolic Engineering\nSpeaker: Hal Alper\, Ph.D. (B.S. ’02)\nAssistant Professor\nC ell and Molecular Biology\nDepartment of Chemical Engineering\nUniversity o f Texas at Austin LAST-MODIFIED:20230127T203417Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Distinguished Alumni Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110922T163000Z DTEND:20110922T173000Z DTSTAMP:20260828T094430Z UID:srnp3pgn4aie84c936adh432fs@google.com CREATED:20110920T150940Z DESCRIPTION:Title: Modeling Recruitment Dynamics on Adaptive Social Network s \nSpeaker: Dr. Maxim Shkarayev\, Dept. of Applied Science\, College of W illiam and Mary LAST-MODIFIED:20230127T203749Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090413T163000Z DTEND:20090413T173000Z DTSTAMP:20260828T094430Z UID:j0jtjtinsup7fiugdmid6b2oco@google.com CREATED:20090202T164458Z DESCRIPTION:Title: Quantum noise in laser-interferometer gravitational-wave detectors and macroscopic quantum mechanics\nSpeaker: Yanbei Chen\, Califo rnia Institute of Technology \nMore Information: Abstract: Current gravitat ional-wave detectors are operating at a factor of ~ 10 above the Standard Q uantum Limit\, which arises from the Heisenberg Uncertainty Principle --- a s applied to ~ 10 kg test masses. With the reduction of classical (e.g.\, t hermal\, seismic\, etc.) noises and the increase of laser power\, the SQL m ay pose a challenge toward the future improvement of detector sensitivity. I will first discuss strategies that allow us to circumvent the SQL while still keeping the optical design practical for km-scale interferometers. I will then motivate the possibility of using gravitational-wave experiments to demonstrate and explore quantum mechanical behaviors of macroscopic tes t masses -- and possible (although I believe very unlikely) deviations. LAST-MODIFIED:20230127T203803Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar Joint with Gravity Theory Group TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220928T170000Z DTEND:20220928T180000Z DTSTAMP:20260828T094430Z UID:2ieisqq1s9n0b9jlim80vl35j0@google.com CREATED:20220926T001522Z DESCRIPTION:Title:  Remote State Preparation (Part I)
    Speaker:  Alexandr u Cojocaru (QuICS)
    Time:  Wednesday\, September 28\, 2022 - 1:00pm
    Lo cation:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

    In this talk I will introduce the remote state preparation primitive\, which can enable a fully classical party to participate in different quantum protocols.  Next\, I will presen t two simple protocols based on trapdoor one-way functions with extra prope rties and show how to construct them based on the Learning-With-Errors prob lem. LAST-MODIFIED:20220926T001522Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Alexandru Cojocaru TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121001T173000Z DTEND:20121001T190000Z DTSTAMP:20260828T094430Z UID:e1erje4pi9ffln7ot82mi7mnps@google.com CREATED:20120921T210904Z DESCRIPTION:Title: "Thoughts on an A* test of GR"\nSpeaker: Jeandrew Brink\ nInstitution: NITheP\, Stellenbosch Univeristy \nAbstract: I review some of the features of the galactic center that make it a good laboratory for ext racting the multipole structure of the massive central compact object. This information will allow us to test the tenets that underlie our understandi ng of General Relativity. I comment on the time-line to experimentally meas uring the quadrupole moment with existing and planned observations in the g ravitational wave and electromagnetic spectrum. I conclude with a discussio n of the current and needed theoretical\ninfrastructure required to make a conclusive test. Focusing in particular\, on the importance of strong field resonant effects during the final stages of the inspiral.\n LAST-MODIFIED:20230127T203637Z LOCATION:4102 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Group Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091009T150000Z DTEND:20091009T160000Z DTSTAMP:20260828T094430Z UID:kt4glkebs25iecle5ns259r424@google.com CREATED:20091002T194458Z DESCRIPTION:Title : Modeling black hole accretion\nSpeaker Name: Chris Reyn olds\nSpeaker Institution : University of Maryland\nNotes: This is the Grav ity Theory Seminar.\nAbstract : For almost the past 20 years\, the paradigm for black hole accretion has highlighted the central role of magnetohydrod ynamic (MHD) turbulence. However\, only in recent years have high-resolutio n simulations started to explore the subtle nature of MHD turbulent disks. After motivating the astrophysical importance of understanding black hole a ccretion\, I will discuss results from a series of simulations focusing on geometrically-thin accretion disks. I shall focus on the dynamics of the di sk and the transition to the plunging flow close to the black hole\, both o f which are important issues to understand if one wishes to explore strong- gravity physics using electromagnetic observations of accreting black hole. LAST-MODIFIED:20230127T203333Z LOCATION:PHYS 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221006T190000Z DTEND:20221006T200000Z DTSTAMP:20260828T094430Z UID:69j1d1faerheohqb54mm66ol7o@google.com CREATED:20221004T143228Z DESCRIPTION:PhD Defense: Chiyu Zhang\, UMCP

    Title: \;Solution-Processed Clean SW CNTs and Their Use as Templates for One-Dimensional Van der Waals Heterostr uctures


    Abstract: \;https://chem.umd.edu/events/solution-processed-clean-swcnts-and-their -use-templates-one-dimensional-van-der-waals LAST-MODIFIED:20221004T143228Z LOCATION:A.V. Williams Building\, Room 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090325T193000Z DTEND:20090325T203000Z DTSTAMP:20260828T094430Z UID:tt21c5djsjae6latv91i5so9t0@google.com CREATED:20090227T153429Z DESCRIPTION:Title: An Overview of the FabLab at the Maryland NanoCenter\nSp eaker: Dr. Jim O'Connor\, University of Maryland LAST-MODIFIED:20230127T203754Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T160000Z DTEND:20221109T170000Z DTSTAMP:20260828T094430Z UID:7t3nl0app7m449h9rvc2nl48je@google.com CREATED:20221020T001335Z DESCRIPTION:Title:  Quantum Cryptography in Algorithmica
    Speaker:   William Kretschmer (University of Texas\, Austin)
    Time:  Wednesday\, N ovember 9\, 2022 - 11:00am
    Location:  ATL 3100A and Virtual Via Zoom: http s://umd.zoom.us/j/94440005174?pwd=azh5VVpnOHl1Q0NoTEhIQS9nQWdEZz09 Meet ing ID: 944 4000 5174 Passcode: 783735

    In this talk\, I will introdu ce a new security property of a cryptographic hash function that is useful for quantum cryptography. This property (1) suffices to construct pseudoran dom quantum states\, (2) holds for a random oracle\, and thus plausibly hol ds for existing hash functions like SHA3\, and (3) is independent of the P vs. NP question in the black box setting. This offers further evidence that one-way functions are not necessary for computationally-secure quantum cry ptography. Our proof builds on recent work of Aaronson\, Ingram\, and Krets chmer (2022). Based on joint work with Luowen Qian\, Makrand Sinha\, and Av ishay Tal. LAST-MODIFIED:20221020T001335Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/94440005174? pwd=azh5VVpnOHl1Q0NoTEhIQS9nQWdEZz09 Meeting ID: 944 4000 5174 Passcode: 78 3735 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: William Kretschmer TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120910T163000Z DTEND:20120910T173000Z DTSTAMP:20260828T094430Z UID:90d28h3mbscqtaincu4u6c83d8@google.com CREATED:20120906T165329Z DESCRIPTION:Title: Random laser\, bio-inspired laser and time-reversed lase r\nSpeaker: Hui Cao\, Yale University\nAbstract: In this talk\, I will revi ew our studies of photonic nanostructures of random morphology. First\, I s how how we can trap light in such structures to make random lasers. Next\, learning from the non-iridescent color generation by isotropic nanostructur es in bird feathers\, we use short-range order to enhance light confinement and improve lasing efficiency in artificial nanostructures. Finally I will introduce our recent work on time-reversed laser - coherent perfect absorb er. \n\n LAST-MODIFIED:20230127T203347Z LOCATION:1201 Physics SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Hui Cao TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081007T200000Z DTEND:20081007T210000Z DTSTAMP:20260828T094430Z UID:7loerjcj7pa6blvvs9gmchh888@google.com CREATED:20080912T171630Z DESCRIPTION:Speaker: David Kestenbaum\, National Public Radio\nTitle:"My Ed itor is a Boson: Tales From the Border of Science and Journalism"\n LAST-MODIFIED:20230127T203543Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120209T183000Z DTEND:20120209T190000Z DTSTAMP:20260828T094430Z UID:t3n7ct8nf4drm5l2pe45c1n7f0@google.com CREATED:20120201T222410Z LAST-MODIFIED:20230127T203330Z LOCATION:Rm 1305F (the new Toll Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100311T171500Z DTEND:20100311T181500Z DTSTAMP:20260828T094430Z UID:uq8m42620dj0gnhcibd7uaf2qo@google.com CREATED:20100125T160636Z DESCRIPTION:Title : Reproductive Asynchrony and Its Consequences for Popula tion Persistence and Spatial Spread\nSpeaker Name: William Fagan\nSpeaker Institution : Biology Dept.\, University of Maryland\nNote that this is not the usual location of the\nApplied Dynamics Seminar LAST-MODIFIED:20230127T203338Z LOCATION:2460 A.V.Williams Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100414T191500Z DTEND:20100414T201500Z DTSTAMP:20260828T094430Z UID:8on5bvtva5ka4847sofetkpigk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100310T204913Z DESCRIPTION:[Speaker] Richard Cavanaugh\n[Institution] University of Illino is (tentative)\n[Title] “W/Z+Jets as a Laboratory for pQCD and New Physics at Hadron Colliders”\n[Abstract] I will present a review of the current sta tus of W/Z+Jets\nproduction at Hadron Colliders and discuss W/Z+Jets as a l aboratory to study perturbative QCD and as an initial stepping stone in the search for new physics at the LHC.\n LAST-MODIFIED:20230127T202941Z LOCATION:Johns Hopkins University SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar Joint with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090413T200000Z DTEND:20090413T210000Z DTSTAMP:20260828T094430Z UID:e56mgc15h5rc42uv2elpotn1tk@google.com CREATED:20090408T144320Z DESCRIPTION:Title: Kinetics of peptide folding and aggregation in crowded a nd confined environments\nSpeaker: Feng Gai\, Associate Professor of Chemis try Physical and Biological Chemistry\, University of Pennsylvania LAST-MODIFIED:20230127T203704Z LOCATION:IPST Building\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090209T190000Z DTEND:20090209T200000Z DTSTAMP:20260828T094430Z UID:aetg23bnq2brjjidaiemc1oc5k@google.com CREATED:20090204T154701Z DESCRIPTION:Title: Chern-Simons-matter theory and mirror symmetry\nSpeaker: Xi Yin\, Harvard University LAST-MODIFIED:20230127T203344Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120207T120000 DTEND;TZID=America/New_York:20120207T130000 DTSTAMP:20260828T094430Z UID:aup3qs4q9j4cektnigdh623aa8@google.com RECURRENCE-ID;TZID=America/New_York:20120207T120000 CREATED:20120119T153520Z DESCRIPTION:Speaker: Dr. Igor Smolyaninov\nUniversity of Maryland LAST-MODIFIED:20230127T203454Z LOCATION:Large Conference Room (1207)\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100413T160000 DTEND;TZID=America/New_York:20100413T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100413T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Phil Marcus\, University of California\, Berkele y\nTitle: "Jovian climate change" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090213T221500Z DTEND:20090213T231500Z DTSTAMP:20260828T094430Z UID:dqe7klgk93d93h2l52fl737kq0@google.com CREATED:20090206T174052Z DESCRIPTION:Title: Quantum cascade lasers\nSpeaker: Dr. Fow Sen Choa\, Depa rtment of Computer Science and Electrical Engineering\, UMBC LAST-MODIFIED:20230127T203811Z LOCATION:Jeong H. Kim Engineering Building\, Pepco Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UM SPIE/OSA Student Chapter Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T190000Z DTEND:20221208T203000Z DTSTAMP:20260828T094430Z UID:04krqjpe17g8bttj2opon8h6uj@google.com CREATED:20221004T141551Z DESCRIPTION:Speaker: Di Luo\, MIT

    Title: Simulating Quant um Field Theories with Neural Quantum States

    Abstract:
    Quantum fi eld theories are known to be fundamental while challenging to be simulated due to high dimensionality and sign problems. In this talk\, I will discuss several advancements of simulating quantum field theories with neural quan tum states. First\, I will present the development of gauge equivariant neu ral network wave functions. The approach has been applied to discrete group gauge theories with abelian and non-abelian symmetries\, and recently exte nded to 2+1D U(1) gauge theory. Next\, I will talk about a gauge invariant approach with a neural flow wavefunction\, Gauge-Fermion FlowNet. The new a lgorithm is able to represent the U(1) freedom without cutoff\, obey the Ga uss's law with dynamical fermions\, sample efficiently without autocorrelat ion time and simulate theories with sign problems. We use the new method to study 2+1D quantum electrodynamics at finite density\, investigating pheno mena such as string breaking\, charge crystal to vacuum phase transition an d magnetic phase transition. If time permits\, I will conclude with our new results on neural network simulation of continuum quantum field theories.< span>
     LAST-MODIFIED:20221206T144444Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090610T153000Z DTEND:20090610T163000Z DTSTAMP:20260828T094430Z UID:uio31bkl7dve2d3tuujpq9n99g@google.com CREATED:20090603T160328Z DESCRIPTION:Thermoelectric and\nSuperconducting \nProperties of PbTe:Tl\nPr ofessor Robert R. Galazka\nInstitute of Physics\nPolish Academy of Sciences \nWarsaw\, Poland\nPbTe is a well-known semiconductor compound that has bee n investigated for more than 60 years and applied for infrared detectors an d thermoelectric power generators in space. Doped p-type with Tl the compou nd exhibits many interesting features. At low temperatures there is a trans ition to the superconducting state while at high temperatures an unusual in crease of thermoelectric power is observed leading to applications for ther moelectric devices. Doping with other acceptors does not produce such a beh avior. Some of the properties of PbTe:Tl are not fully understood. This lec ture is going to review the most interesting properties of PbTe:Tl based on the literature and our own preliminary results.\n LAST-MODIFIED:20230127T203044Z LOCATION:Room 1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130214T183000Z DTEND:20130214T190000Z DTSTAMP:20260828T094430Z UID:s31lhhd9ave6v0ufd7ctdpgj9s@google.com CREATED:20130209T235851Z LAST-MODIFIED:20230127T203348Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101021T190000Z DTEND:20101021T200000Z DTSTAMP:20260828T094430Z UID:4q3kukht24ooihol0oljsirc5g@google.com CREATED:20101008T174041Z DESCRIPTION:[Title] "An interesting angle at the LHC"\n[Speaker] Vikram Ren tala\n[Institution] University of Arizona \n[Abstract] The first part of th is talk is about spin measurement of new particles at the LHC using the az imuthal angular distribution of decay products from a parent \nparticle who se spin we wish to measure. This technique is model independent and relies only on simple angular momentum rules and quantum mechanics. In the second part of the talk we discuss WZ scattering at the LHC. We find that the sam e azimuthal angle can be used as a probe of a strongly coupled Higgs sector . LAST-MODIFIED:20230127T203554Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131126T210000Z DTEND:20131126T220000Z DTSTAMP:20260828T094430Z UID:peth24k8ksi71jepa7flspmj8g@google.com CREATED:20130821T182625Z DESCRIPTION:Speaker: Amy Graves\nInstitution: Swarthmore College\nTitle: " Gender and (physical) Science"\nAbstract: We physicists like to think of ou r field as a pure\, intellectual activity ... a realm where bright people s hould flourish regardless of their race or gender. On the other hand\, rac e and gender are key features around which we base our personal identities. And whether we like it or not\, personal identity is bound up with profess ional identity. So whether a college student chooses science\, whether the y persist\, and if they ultimately become a scientist\, has a great deal to do with their race and gender\, particularly for a "hard" science like phy sics. This talk will bring in threads from the history of science\, educ ation\, social psychology\, and feminist critique of science\, to try and address where women and underrepresented minorities stand today\, and how p hysics can continue to become more inclusive to all. LAST-MODIFIED:20230127T203745Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220927T171500Z DTEND:20220927T181500Z DTSTAMP:20260828T094430Z UID:29jdmc34jjuffi2djd6v82v7vq@google.com CREATED:20220915T180226Z DESCRIPTION:Speaker: Dhruv Bansal\, Co-Founder and CSO of Unchained Capital \n\nTitle: Why Physicists Should Care About Bitcoin (No I'm Not Selling Any thing)\n\nAbstract: Bitcoin is a new kind of digital money that's often in the news these days\, usually for the wrong reasons. But bitcoin is also a real-world network that uses energy and transports information. This means we can use the tools of physics to analyze and constrain bitcoin's behavior . I propose some simple models for bitcoin from the perspectives of dynamic al systems\, thermodynamics\, and statistical mechanics. I hope these lead to some interesting questions and speculations.\n\nBiography: Graduate stud ent at University of Texas Austin\, Center for Nonlinear Dynamics in 2008-2 011\, studying networks\, fluids\, school systems\, computational physics\, and data science. Started Infochimps company in 2008 with partners\, dropp ed out of graduate school in 2011\, sold Infochimps in 2013. Discovered bit coin in 2011\, ignored it. Bought "too late" in 2013. By 2016\, working in bitcoin full-time with Unchained. LAST-MODIFIED:20220920T183231Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220930T160000Z DTEND:20220930T170000Z DTSTAMP:20260828T094430Z UID:20mcde7md021a34k38orc5ipq5@google.com CREATED:20220926T000504Z DESCRIPTION:Title: Krylov complexity and many-body localization\nSpeaker: Jacob Lin (RQS and QuICS)\nTime: Friday\, September 30\, 2022 - 12:00pm\n Location: ATL 2324\n\nMotivated by the recent progress of quantum chaos an d quantum information scrambling\, the growth of an operator under the Heis enberg evolution has attracted a lot of attentions. I will first introduce a recently proposed perspective on the operator growth problem from the Lan czos algorithm point of view and the associated “Krylov complexity”. While reviewing some of the recent results of Krylov complexity of the chaotic sy stems and integrable systems by other researchers\, I will touch on our res ults about the “Krylov complexity” of the many-body localization (MBL) sys tems. In particular\, we find strong numerical evidences that the Krylov co mplexity of MBL is bounded in time\, suggesting that the Lanczos algorithm could be an efficient way in simulating the operator dynamics in the MBL sy stems. I will also mention some very recent works by other people on genera lizing ``Krylov “complexity” to ``spread complexity” and to open systems\, and some potential future directions.\n\n(Pizza and refreshments will be se rved after the talk.) LAST-MODIFIED:20220926T000504Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Jacob Lin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091203T190000Z DTEND:20091203T203000Z DTSTAMP:20260828T094430Z UID:vuotmvtvshbcape55af6jcf7d0@google.com CREATED:20091118T151326Z DESCRIPTION:[Title] Atomic- and Molecular- Scale Devices: Beyond DC Electro nic Transport\n[Speaker] Professor Douglas Natelson\n[Institution] Rice Uni versity\n[Abstract] Techniques developed over the last two decades have led to tremendous\nprogress in measuring electronic conduction through atomic- and\nmolecular-scale structures. Interpreting those measurements with the\ nhelp of theoretical models has given great insight into the processes that \ncan take place in these quantum systems driven out of equilibrium.\nHowev er\, as useful as DC characterization has been\, there is a growing\nrealiz ation that going beyond simple measurements of conduction can\npay signific ant benefits. I will present two examples of this new\napproach. In the fir st\, we use shot noise\, the intrinsic fluctuations in\ncurrent caused by t he discreteness of the electronic charge\, to examine\nthe quantum characte r of conduction in atomic-scale metal junctions at\nroom temperature. In th e second\, we combine electronic transport\nstudies with surface-enhanced R aman scattering to see the effects of\ninelastic electron-vibrational scatt ering at the single-molecule level.\nHost: Min Ouyang LAST-MODIFIED:20230127T203106Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130418T173000Z DTEND:20130418T180000Z DTSTAMP:20260828T094430Z UID:k4or9664dslj329h8adsq0udb0@google.com CREATED:20130414T074650Z LAST-MODIFIED:20230127T203756Z LOCATION:Phys Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:refreshments for Condensed Matter Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081203T160000Z DTEND:20081203T170000Z DTSTAMP:20260828T094430Z UID:v644qrdritlk5vgdd2jqdv1fqk@google.com CREATED:20080922T185958Z DESCRIPTION:Speaker: Millard Alexander\, University of Maryland\nTitle: Pro vocative Cl - H Interactions LAST-MODIFIED:20230127T203256Z LOCATION:Chemistry Building\, Room 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry/Chemical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090427T200000Z DTEND:20090427T210000Z DTSTAMP:20260828T094430Z UID:nrqedueuevfq6jamcu97d8vinc@google.com CREATED:20090424T171336Z DESCRIPTION:Title: Transverse (Spin) Structure of Hadrons\nSpeaker: Matthia s Burkardt\, New Mexico State University\nMore Information: Abstract: Parto n distributions in impact parameter space\, which are obtained by Fourier t ransforming GPDs\, exhibit a significant deviation from axial symmetry when the target and/or quark is transversely polarized. In combination with the final state interactions\, this transverse deformation provides a natural mechanism for naive-T odd transverse single-spin asymmetries in semi-inclus ive DIS. The deformation can also be related to the transverse force acting on the active quark in polarized DIS at higher twist. LAST-MODIFIED:20230127T202935Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20140317 DTEND;VALUE=DATE:20140319 DTSTAMP:20260828T094430Z UID:jqqlru6o982fsgsvqi8cq4m1sk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20140304T184936Z LAST-MODIFIED:20230127T203319Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Spring Break - No Seminars TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101207T210000Z DTEND:20101207T220000Z DTSTAMP:20260828T094430Z UID:9uhn1vk6d7ov9ua8ta1fia16jk@google.com CREATED:20100825T175603Z DESCRIPTION:Speaker: Dan Lathrop\, University of Maryland\nTitle: Quantum T urbulence\n LAST-MODIFIED:20230127T203759Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100203T210000Z DTEND:20100203T220000Z DTSTAMP:20260828T094430Z UID:3hao2uare7h9h1aedipp98j59s@google.com CREATED:20100114T153242Z DESCRIPTION:Title : Quantum noise limits in femtosecond frequency combs\nSp eaker Name: Dr. Jared Wahlstrand\nSpeaker Institution : IREAP\, Univ. of Ma ryland\nAbstract : The optical spectrum of a mode-locked laser is a "comb" of sharp lines\nwhich is extremely useful for referencing radio frequencies to optical\nfrequencies and vice versa. The development of femtosecond fr equency\ncombs based on phase-controlled\, mode-locked lasers has revolutio nized\nultrafast science and atomic frequency standards\, leading to the\na warding of the Nobel prize to Hansch and Hall in 2005. I'll review\nfemtos econd frequency combs and their applications and describe a series\nof expe riments aimed at quantitatively understanding the fundamental\nquantum limi ts due to spontaneous emission. LAST-MODIFIED:20230127T203713Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130221T190000Z DTEND:20130221T200000Z DTSTAMP:20260828T094430Z UID:ps5n54smgcupg09fbksut5qdrc@google.com CREATED:20130213T133811Z DESCRIPTION:Title : Nanoscale Strain Engineering for Energy\n\nSpeaker Name : Marina S. Leite\n\nSpeaker Institution : NIST Center for Nanoscale Scienc e and Technology (CNST)\n\nAbstract : The ability of controlling strain at the nanoscale governs numerous materials’ properties\, from structural morp hology of solid-state batteries to band gap engineering for photovoltaic de vices. Depending on the mechanical strain between a substrate and an epitax ially grown material\, different morphologies can be achieved ranging from strained planar films to 3-dimensional nanocrystals. In this talk\, I will discuss how strained nanoarchitectures can be used for improved energy gene ration and storage applications. First\, I will discuss the driving forces for alloying in quasi-equilibrium Ge-Si nanocrystals\, which results primar ily from entropy. I will describe experiments in which we tailored adatoms diffusion mechanisms to achieve both open and closed thermodynamic systems at the nanoscale. Second\, I will discuss the role of strain engineering in thin films to achieve >50% multjunction solar cells with optimized bandgap energies. I will also discuss how we can reso\n lve the photo-electronic p roperties of thin film solar cell technologies using near field scanning pr obe techniques. Such measurements help elucidate the main limitations of th ese devices\, which currently dominate the PV market. Lastly\, I will discu ss design alternatives for tailoring the anode structural properties of sol id- state thin film batteries to extend their lifetimes and improve their p erformance. LAST-MODIFIED:20230127T203902Z LOCATION:1105 Jeong H. Kim Engineering Bldg. (Pepco Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:special joint Materials Science/University of Maryland Energy Resea rch Center seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220922T200000Z DTEND:20220922T210000Z DTSTAMP:20260828T094430Z UID:1latmg968rcd5ujcouli6emp3k@google.com CREATED:20220920T170553Z DESCRIPTION:Title: CMB Distortions from and Axion-Dark Photon-Photon Coupli ng\n\nAbstract : The Cosmic Microwave Background (CMB) spectrum matches tha t of a perfect blackbody with very high precision. Therefore\, any model th at distorts this spectrum is highly constrained. Motivated by certain dark sector models\, we consider distortions caused by an axion-dark photon-phot on coupling. In an axion dark matter or dark photon dark matter background\ , this coupling converts CMB photons into invisible dark photons or axions respectively. We present the details of this distortion and the constraints on the axion-dark photon-photon coupling that result from it. LAST-MODIFIED:20220920T170702Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Clayton Ristow Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130917T171500Z DTEND:20130917T183000Z DTSTAMP:20260828T094430Z UID:puubjnticb4gnbq475d0lteku4@google.com CREATED:20130910T152757Z DESCRIPTION:Speaker Name: Professor Shmuel Fishman\nSpeaker Institution : T echnion\, Israel\nTitle : A Structural Phase Transition for Cold Ion Chains : Classical and Quantum.\n LAST-MODIFIED:20230127T203800Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121204T210000Z DTEND:20121204T220000Z DTSTAMP:20260828T094430Z UID:aorr7b6ihk3qbo0mbc02vf5j6s@google.com CREATED:20121130T142315Z DESCRIPTION:MOVED TO THURSDAY 12/6\n\nTHE 2012 FISCHELL LECTURE\n \nSpeaker : Dr. Robert E. Fischell\nTitle: Implanted Computers For Creating Improved Medical Treatments\n \nDECEMBER 6\, 2012 // 4:00 P.M.\n1103 BIOSCIENCE RE SEARCH BUILDING\n\nPlease RSVP at\nhttps://www.surveymonkey.com/s/Fischell LAST-MODIFIED:20230127T203810Z LOCATION:1103 BIOSCIENCE RESEARCH BUILDING SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium: MOVED to 12/6 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110207T150000 DTEND;TZID=America/New_York:20110207T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110214T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] TBA\n[Speaker] TBA\n[Institution] TBA\n[Abstract] TBA LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220929T183000Z DTEND:20220929T193000Z DTSTAMP:20260828T094430Z UID:605hsv16f8fu9ujllfp907emjj@google.com CREATED:20220928T161550Z DESCRIPTION:Speaker: \;Raul Briceño\, ODU/JLab

    Title : Three-pion scattering from lattice QCD

    Abstract:
    The majori ty of QCD states are unstable resonances that couple strongly to multi-part icle states\, with a significant fraction of these coupling to asymptotic t hree-particle states. Lattice QCD\, being a framework that incorporates all dynamical coupling non-perturbatively\, provides a promising pathway towar d studying the excited states of the theory. Although challenging\, lattice QCD calculations of systems composed of three-hadrons are finally being pe rformed. In this talk\, I present a calculation by the Hadron Spectrum Coll aboration\, Phys.Rev.Lett. 126:012001 (2021)\, which is the first to go fro m the lattice QCD correlation functions to the desired infinite-volume scat tering amplitudes. I review outstanding challenges to study the low-lying r esonances of QCD that couple to three particles.     LAST-MODIFIED:20220928T161550Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110217T163000Z DTEND:20110217T173000Z DTSTAMP:20260828T094430Z UID:tmbhegjfebgj2pnueqq3078pvs@google.com CREATED:20110215T155411Z DESCRIPTION:[Topic] HAWC: The High Altitude Water Cherenkov Experiment \n[P aper Refrence] http://hawc.umd.edu/science.php\n[Presenter] Andy Smith\, Un iversity of Maryland\n LAST-MODIFIED:20230127T203551Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101102T171500Z DTEND:20101102T183000Z DTSTAMP:20260828T094430Z UID:b0djb0bdrtvj5tkaqaf2jtcadg@google.com CREATED:20101027T150316Z DESCRIPTION:Title : Adhesion on membranes and filaments on nano-patterened surfaces\nSpeaker Name: Professor Olivier Pierre-Louis\nSpeaker Institution : University Lyon 1\, France\n LAST-MODIFIED:20230127T203736Z LOCATION:IPST Bldg 085 Rm. 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220915T153000 DTEND;TZID=America/New_York:20220915T170000 RRULE:FREQ=WEEKLY;UNTIL=20221020T035959Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:1d79i5dnaau5u72j09nopncpv8@google.com CREATED:20220905T135853Z DESCRIPTION:

    Organizers: S. Jim Gates (Physics)\, Richard Wentworth (Math)\, Tristan Hubsch (Physics \, Howard Univ.)\, Jonathan Rosenb erg (Math)\, Amin Gholampou r (Math)
    Other Faculty Participants: Paul Green (Math\, emeritus)
     \;

    < p>When: Thursdays @ 3:30pm-4:30pm
    Where: Toll bldg.\ , room 1117 (probably hybrid format)

    Please download and import the following iCalendar (.ics) files to your calendar system.
    We ekly: https://umd.zoom.us/meeting/tJUucuiurzIpHNychTfBrN1yA4OLScbSt3om/ics?icsToken=98tyKuCprT4rHNWcsx-PRowcA4_4d-7zmFhego1Enxf RBQJBTFLvF7ZtHoF8EuvE

    Join Zoom Meeting
    https://umd.zoom.us/j/91351619368
    < br>Meeting ID: 913 5161 9368


    This in terdisciplinary RIT will aim to foster interactions between mathematicians and physicists on topics of mutual interest. \; It will roughly follow the example of a s imilar RIT from 2010-2011 and from the last three years. The topic for 2016-17 was mirror symmetry. \; Topics since 2017-2018 are listed below to give you an idea of what sort of things we tend to cover.

    It is not assumed that participants already be knowledgeable in both math and physics\, just in some aspect of one or the other. Relevant math topic s are differential geometry\, representation theory\, algebraic topology\, and algebraic geometry. Relevant physics topics are classical and quantum f ield theories\, and supersymmetry.

    Students (advanced undergraduate s or graduate students) who want to participate can get 1-3 credits as MATH 489 (undergrad) or MATH/AMSC 689 (graduate) if they wish\, by contacting t he organizers.

    Topics and references for 2022-2023

    The to pic for (at least the first half of) fall 2022 is supersymmetry and repr esentation theory. \; Here are a few basic references:

    1. Ursula Wichter\, Designing supersymmetry
    2. Yan X. Zh ang\, Adinkras for mathematicians
    3.  \;a quick bibliogr aphy for physicists at I NSPIRE
    4. a book draft on "An Introduction to Supersymmetry Using Adinkras" by Charles Doran\, Kevin Iga\, and Ursula Whitcher. \; not fo r public distribution yet\, but \; will be made available to participan ts
     LAST-MODIFIED:20221227T190734Z LOCATION:Toll rm 1117 & hybrid SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121022T163000Z DTEND:20121022T173000Z DTSTAMP:20260828T094430Z UID:q62q5ha9o48jpgv17ki97tu3cg@google.com CREATED:20121018T175810Z DESCRIPTION:"Anderson localization and Coherent Backscattering of ultra col d atoms in disordered optical potentials" LAST-MODIFIED:20230127T203203Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar -Alain Apect TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120419T180000Z DTEND:20120419T193000Z DTSTAMP:20260828T094430Z UID:quq5fro5qkipc8uq3qcqv7854s@google.com CREATED:20120406T182051Z DESCRIPTION:Speaker: Yuval Oreg\, Weizmann Institute of Science\nTitle: Maj oranas in wire networks\nAbstract:\nTopological quantum computation provide s an elegant way\naround decoherence\, as one encodes quantum information i n a nonlocal\nfashion that the environment finds difficult to corrupt. Zero energy\nMajorana Fermion states (Majorans for short) emerges as a key conc ept\nfor a realization of nonlocal encoding. In this talk we will discuss\n what are Majoranas? What makes them nonlocal? and how one may create\nand m anipulate them. In particular we will discuss recipes for driving\nsemicond ucting wires into a topological phase supporting Majoranas. In\nthis settin g Majoarans can be transported\, created\, and fused by\napplying locally t unable gates to the wire. More importantly\, we will\nshow that networks of such wires allow braiding of Majoranas fermions\nand that they exhibit non -Abelian statistics. If time permits we will discuss\npossible ways to expe rimentally detect Majoranas and recent experiments.\n\nHost: Victor Galits ki LAST-MODIFIED:20230127T203418Z LOCATION:Rm 1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110214T213000Z DTEND:20110214T223000Z DTSTAMP:20260828T094430Z UID:qe3j88fd5jqa2dkujenuv2nmuc@google.com CREATED:20110210T140148Z DESCRIPTION:Speaker: Alexander Malinin\, University of Maryland \nTopic: TR D-II Status and the CREAM Recovery in Antarctica. LAST-MODIFIED:20230127T203502Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPACE AND COSMIC RAY PHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120418T200000Z DTEND:20120418T220000Z DTSTAMP:20260828T094430Z UID:bv6f7i07kgsarqb68c0rn2cb6o@google.com CREATED:20120411T130019Z DESCRIPTION:Title : Observation of electron-antineutrino disappearance at D aya Bay\nSpeaker Name: Karsten M. Heeger\nSpeaker Institution : University of Wisconsin\nAbstract : The Daya Bay Reactor Neutrino Experiment has measu red a non-zero value for the neutrino mixing angle theta13 with a significa nce of 5.2 standard deviations. Antineutrinos from six 2.9 GWth reactors we re detected in six antineutrino detectors deployed in two near (flux-weight ed baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With 55 days of data\, 10416 (80376) electron antineutrino candidate s were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R=0.940 +/- 0.011(stat) +/- 0.004(syst). A rate-only analysis finds sin^22theta13=0.092 +/- 0.016( stat) +/- 0.005(syst) in a three-neutrino framework. I will discuss the rec ent results and prospects for the Daya Bay experiment.\n LAST-MODIFIED:20230127T203851Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091109T200000Z DTEND:20091109T220000Z DTSTAMP:20260828T094430Z UID:4k1pkat8t3ko6agj07ajlqhdtc@google.com CREATED:20091102T214236Z DESCRIPTION:[3-3:30 Elias Balarus\, BioEngineering]\n\n"Towards Petascale C omputational Mechanics and the Challenges of Data Processing and Analysis"\ n\n[3:30-4:00 Manuel Tiglio\, Physics & CSCAMM]\n\n"High Performance Comput ing Challenges in Black Hole Simulations"\n\n\n[4:00-4:30 Amitabh Varshney\ , Computer Science]\n\n"FlexiView: A System for Visualization of Human Acti vities for Multicamera Networks"\n\n\n[4:30-5:00 Hung-Sheng Tsao\, Sun Micr osystems]\n\n"Strategies in Data Intensive Computing"\n\n\nSponsored by the University of Maryland High Performance Computing Colloquium series (Depar tment of Computer Science\, The Institute for Physical Science and Technolo gy and the Office of Information Technology) and Sun Microsystems.\n\n LAST-MODIFIED:20230127T203815Z LOCATION:AV Williams 3258 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UM - Sun Microsystems Mini-workshop on Data\, Scalable Storage\, an d HPC with GPUs TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220921T150000Z DTEND:20220921T160000Z DTSTAMP:20260828T094430Z UID:1qpknvj85t5fetns7i8r5etrv2@google.com CREATED:20220915T170759Z LAST-MODIFIED:20220915T170759Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS/ANE/CHEMPHYS JOINT SEMINAR - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T200000Z DTEND:20221208T210000Z DTSTAMP:20260828T094430Z UID:41opps44m0ih33cvhdg7k0jdhl@google.com CREATED:20221031T154042Z DESCRIPTION:Literature Seminar

    Speaker: Md Tarikul Islam\, UMCP
    < br>Title: \; Protein Unfolding in Freeze Frames: Intermediate States are Revealed by Var iable-Temperature Ion Mobility−Mass Spectrometry LAST-MODIFIED:20221116T155953Z LOCATION:A.V. Williams Building\, Room 1146 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131029T200000Z DTEND:20131029T210000Z DTSTAMP:20260828T094430Z UID:u22cf8ldgm8bb5jdnribi6d78s@google.com CREATED:20130821T151949Z DESCRIPTION:Speaker: Roger Blandford\, Stanford University\nTitle: The Ac celerating Universe\nAbstract: From keV electrons in terrestrial aurorae to Ultra High Energy Cosmic Rays in unidentified "Zevatrons"\, the cosmos ha s a strongly plutocratic tendency to concentrate energy in a tiny minority of suprathermal particles. The mechanisms involved can be traced back to th e ideas of Faraday\, Alfvén and Fermi and\, although the details are idios yncratic to the many sites that we have observed and studied\, much can be learned from comparing and contrasting particle acceleration in these locat ions as well as computationally and experimentally. It will be argued that new mechanisms are required to account for recent observations of galactic nuclei\, pulsar wind nebulae and gamma ray bursts and some possibilities wi ll be discussed. LAST-MODIFIED:20230127T202955Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110209T150000 DTEND;TZID=America/New_York:20110209T160000 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110209T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] Observing Black Holes\n[Speaker] Jonathan McKinney\n[In stitution] Stanford University\n[Abstract] Black hole accretion systems are among the most powerful phenomena in the Universe and are excellent labora tories for probing and testing general relativity. I discuss how such syst ems work\, and I show how black hole spins can be measured using photon spe ctra from black hole x-ray binaries. Such measurements are then shown to b e reliable by using three-dimensional general relativistic magnetohydrodyna mical simulations. I also use black hole accretion simulations to reveal h ow relativistic jets are launched and remain stable despite well-known magn etic kink instabilities. Such jet simulations show how observations of jet s from active galactic nuclei implicate the cosmological evolution of black hole spin. LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091111T210000Z DTEND:20091111T220000Z DTSTAMP:20260828T094430Z UID:gfh93l1splet31jgdtjvr4dpus@google.com CREATED:20091027T172757Z DESCRIPTION:Title : Experimental Evidence for MHD Plasma Centrifugal Confin ement in Open Magnetic Field Configuration\nSpeaker Name: Dr. Catalin Teodo rescu\nSpeaker Institution : IREAP\nAbstract : In the Maryland Centrifugal Experiment\, the plasma is created in a shaped open-field magnetic configur ation. Plasma rotation perpendicular to the magnetic field at supersonic sp eeds is controlled by an externally-applied E x B drift.\nThis work documen ts the centrifugal confinement effect produced by the plasma rotation from interferometric measurements of plasma density at the magnetic minimum (mid plane) and 85 cm off-midplane. Complete time histories\nof density at these two locations are obtained and compared to deduce the efficacy of axial co nfinement. Other key parameters are also directly measured simultaneously a t midplane (rotation velocity profiles\, ion temperature\, and diamagnetic flux) and off-midplane (diamagnetic flux). The observed scaling of the aver age density ratio at midplane and off-midplane is obtained as a function of the shape of the magnetic field (mirror ratio) and the data are compared w ith the MHD (Grad-Shafranov equation) solution of the centrifugally confine d density. The theory depends on the sonic Mach number and mirror ratio and the data are shown to be in\nagreement with the predictions of the ideal M HD equilibrium theory. LAST-MODIFIED:20230127T203656Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120202T190000Z DTEND:20120202T203000Z DTSTAMP:20260828T094430Z UID:fdg9juj47aeg3oblrf92lm34ks@google.com CREATED:20120104T160823Z DESCRIPTION:The Colloquium speaker\, Gabi Kotliar\, Rutgers University\, ha s cancelled his talk.\n LAST-MODIFIED:20230127T203752Z LOCATION:Rm 1201\, Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquium Cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100301T210000Z DTEND:20100301T220000Z DTSTAMP:20260828T094430Z UID:m8rilo30197r5fjjrn77eqs44s@google.com CREATED:20100219T202828Z DESCRIPTION:Title : Unraveling the Cell Biology of Plasma Membrane Repair\n Speaker Name: Professor Norma Andrews\nSpeaker Institution : University of Maryland\nNotes: (*Refreshments at 3:45pm) LAST-MODIFIED:20230127T203337Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101028T163000Z DTEND:20101028T173000Z DTSTAMP:20260828T094430Z UID:ktith4l14nlassuf6v3mhrcbdc@google.com CREATED:20101022T154654Z DESCRIPTION:Title: Recent Results for Random Key Graphs: Connectivity\, Tr iangles\, etc.\nSpeaker: Prof. Armand Makowski\nUniversity of Maryland LAST-MODIFIED:20230127T203759Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110309T144500 DTEND;TZID=America/New_York:20110309T154500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110309T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "The Search for WIMP Dark Matter"\n[Speaker] Louis Stri gari\, a candidate of UMD-JSI faculty position\n[Institution] Stanford Univ ersity\n[Abstract] For nearly the past century\, the nature of dark matter in the Universe has puzzled astrophysicists. During the next decade\, a ser ies of experiments will determine if a substantial amount of the dark matte r is in the form of non-baryonic\, Weakly-Interacting Massive Particles (WI MPs). In this talk I will discuss and interpret modern limits on\nWIMP dark matter from two particularly promising searches: particle dark matter anni hilation into high energy gamma-rays in satellite galaxies and scattering o f dark matter particles in underground laboratories. I will show that these searches are just now obtaining sensitivity to probe the parameter space o f cosmologically-predicted WIMPs created during the earliest epoch in the U niverse. I will discuss the science to extract\nfrom a positive signal in d ifferent experiments\, and the prospects for an era of dark matter astrophy sics.\n LAST-MODIFIED:20230127T203416Z LOCATION:1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110221T150000 DTEND;TZID=America/New_York:20110221T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110221T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "The Search for New GeV-scale Forces"\n[Speaker] Rouven Essig\n[Institution] SLAC\, Stanford University\n[Abstract] A new force me diated by a new vector boson with mass in the MeV to GeV range and with ver y weak coupling to ordinary matter appears naturally in many theoretical mo dels and could also explain a variety of observed anomalies. Such anomalie s include the discrepancy between the predicted and the experimentally obse rved value for the muon anomalous magnetic moment\, and recent cosmic-ray d ata that can be explained by dark matter interacting through this force wit h ordinary matter. This talk will review the motivation for such a new for ce and present a broad array of probes of this physics. These probes inclu de indirect astrophysical probes such as gamma-ray observations of Milky-Wa y dwarf satellite galaxies\, which constitute some of the least luminous an d most dark matter dominated galaxies known\; high-intensity e+e- colliders \, such as BaBar and BELLE\, whose existing data sets may contain thousands of spectacular events\; and new high-intensity fixed-target experiments at electron accelerators such as Jefferson Laboratory. LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100923T140000 DTEND;TZID=America/New_York:20100923T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20100923T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Measurement and Control of Individual Electron Spins i n Few-Electron Silicon Quantum Dots"\n[Speaker] HongWen Jiang\n[Institution ] UC Los Angeles\n[Abstract] It is becoming increasingly apparent that meso scopic Si devices have considerable potential for applications in spintroni cs and in quantum information processing. We\, at UCLA\, have developed el ectrostatically-confined quantum dots on Si metal-oxide-semiconductor based materials. A sequence of electrical characterizations shows that the quan tum dots have unprecedented device stability and controllability. In this talk\, I present results from transport and excited states spectroscopy mea surements in the few electron regime. Unusual spin filling configurations due to strong spin exchange coupling\, along with non-linear transport feat ures associated with high-spin states will be reported. An integrated char ge sensing channel adjacent to the quantum dot has been used to study the i ndividual electron tunneling events and energy relaxation dynamics. The el ectron spin-lattice relaxation time of the individual spins is measured by the charge sensor with a pump-and-probe technique. I will discuss mechanism s leading to spin relaxation in this type of Si device. Finally\, I will d escribe an ongoing experiment to detect ESR of single electrons in a double quantum dot.\n[Note] Refreshment is served at 1:30pm in a new Toll Room (r oom 1305F) located behind of Physics IT Help Desk. LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131022T171500Z DTEND:20131022T183000Z DTSTAMP:20260828T094430Z UID:kut1hlhe9glt0er5i3nhqvvrrg@google.com CREATED:20131015T022849Z DESCRIPTION:Title : Statistical Mechanics and Control Implementation Using Port-Hamiltonian Systems.\n\nSpeaker Name: Professor Henrik Sandberg\n\nSpe aker Institution : KTH Royal Institute of Technology\, Stockholm\, Sweden LAST-MODIFIED:20230127T203909Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110208T181500Z DTEND:20110208T193000Z DTSTAMP:20260828T094430Z UID:f7ourermuorkn707pimbjm99s8@google.com CREATED:20110131T194124Z DESCRIPTION:Title : Controlling Aggregation in Non-Polar Colloidal Suspensi ons Through Electrostatics\nSpeaker Name: Dr. Sara Hashmi\nSpeaker Institut ion : Yale University\nNotes: As in the past\, each seminar will be precede d by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T203756Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Mechanics Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T180000Z DTEND:20221109T190000Z DTSTAMP:20260828T094430Z UID:0kpcd48074losagh3a8b0s7469@google.com CREATED:20221031T184803Z DESCRIPTION:
    Speaker: Nikita Astrakhantsev\, University of Zü rich

    Title: Phase diagram of the XXZ spin-1/2 model on the pyrochlor e lattice and its relation to the Programmable Rydberg Atoms Simulator
    < br>Abstract: The spin-1/2 nearest-neighbor XXZ model on the pyrochlore latt ice is an iconic frustrated three-dimensional spin system with a rich phase diagram on the $\\lambda$ axis\, where $\\lambda$ is the XXZ interaction a nisotropy.

    In the first part of the talk\, I will focus on the Heise nberg case $\\lambda = 1$\, in which the model is debated to possess a quan tum spin-liquid (QSL) ground state. In [Phys. Rev. X 11\, 041021 (2021)]\, we contested this hypothesis with an extensive numerical investigation usin g both exact diagonalization and complementary variational techniques. Spec ifically\, we employed an RVB-like many-variable Monte Carlo ansatz and con volutional neural network quantum states for (variational) calculations wit h up to $4\\times 4^3$ and $4 \\times 3^3$ spins\, respectively. We demonst rated that these techniques yield consistent results\, allowing for reliabl e extrapolations to the thermodynamic limit. In addition\, we found clear i ndications of a dimer order with spontaneously broken inversion and rotatio nal symmetry\, calling the scenario of a featureless QSL into question.


    In the second part of the talk\, I will consider the region $\\lamb da \\ll 1$\, corresponding to the Ising model with small exchange interacti on. At the $\\lambda = 0$ Ising case\, the model possesses a thermodynamica lly-degenerate ground state\, described by the {\\it two-in\, two-out} spin ice rule. Introduction of finite $\\lambda \\ll 1$ exchange interaction co uples the spin ice ground states and generates the U(1) QSL with emergent U (1) electrodynamics. In this talk\, I will demonstrate that this QSL can be embedded into the system of Rydberg atoms governed by the Sengupta-Sachdev Hamiltonian. I will show the preliminary results of the simulation of this embedding within the quantum Monte Carlo approach. This embedding continue s the line of QSL-Rydberg mappings [see\, for instance\, Ruben Verresen et al.\, Phys. Rev. X 11\, 031005] and allows one to simulate the U(1) QSL on the pyrochlore lattice using the analog Rydberg simulator on the system siz es that are otherwise intractable for classical numerical approaches. LAST-MODIFIED:20221031T184913Z LOCATION:ATL3332\, JQI Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar: Nikita Astrakhantsev TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091022T223000Z DTEND:20091022T233000Z DTSTAMP:20260828T094430Z UID:908vpunulsiq9fh7b1aatbc6n4@google.com CREATED:20091019T162838Z DESCRIPTION:SPEAKER: Dr. Bruce H. Dean\, NASA/GSFC\nTITLE: "PHASE RETRIEV AL TECHNOLOGY FOR SPACE OPTICS CONTROL"\n LAST-MODIFIED:20230127T203700Z LOCATION:Chemistry Building Marker Seminar Room - Room 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UM SPIE/OSA Student Chapter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120426T123000 DTEND;TZID=America/New_York:20120426T133000 RRULE:FREQ=WEEKLY;UNTIL=20120426T163000Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:1m1cq74edn1mdslvom5ns0qc1c@google.com CREATED:20120420T194549Z LAST-MODIFIED:20230127T203552Z LOCATION:1207 Energy Research Facility SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100916T140000 DTEND;TZID=America/New_York:20100916T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20100916T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Nonlinear optics with ballistic charge and spin curren ts in semiconductors"\n[Speaker] Hui Zhao\n[Institution] University of Kans as\n[Abstract] Electronic transport on nanometer dimensions is of fundament al importance in semiconductor nano-electronics. In this talk I will discus s our recent experimental studies of ballistic charge and spin transport on nanometer length scales by using ultrafast nonlinear optical techniques. I will discuss some basic ideas of optical injection of ballistic currents t hrough a coherent control technique utilizing quantum interference of multi ple absorption pathways driven by multiple laser pulses. I will then descri be how to study the dynamics of these ballistic currents by tracking the po sition of the carriers with 100 femtosecond temporal resolution and sub-nan ometer spatial resolution. I will discuss second-order nonlinear optical ef fects induced by the spin and charge currents\, and show that these effects can be used for a direct\, nondestructive\, and real-time imaging of these currents. I will also discuss our recent experiments on the intrinsic spin Hall effect using these ballistic currents.\n[Note] Refreshment is served at 1:30pm in a new Toll Room (room 1305F) located behind of Physics IT Help Desk. LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110818T150000Z DTEND:20110818T163000Z DTSTAMP:20260828T094430Z UID:jj2oviv323a0d3af1uvruf16gg@google.com CREATED:20110729T150954Z DESCRIPTION:Title : Boson pairing and unusual criticality in a generalized XY model\nSpeaker Name: Austen Lamacraft\nSpeaker Institution : University of Virginia\nNotes: For more talks see: http://www.physics.umd.edu/cmtc/sem inars.html\nAbstract : Over the years there has been considerable interest in bosonic systems where both single particle condensates and pair condensa tes may form. On general grounds the transition between these two condensat es may be of the Ising type. Ordering of the phase occurs modulo 2pi in the single particle condensate and modulo pi in the pair condensate. Thus movi ng from the latter to the former involves an additional breaking of an Isin g symmetry. A simple statistical model that captures this physics is the ge neralized XY model of the title\, where terms with both 2pi periodicity and pi periodicity terms are included. 25 years ago this model was introduced by Korshunov and by Grinstein and Lee and its topological defects and phase diagram in two dimensions discussed. In this work we show\, on the basis o f both a field theoretical formulation of the problem and numerical simulat ions\, that there is a narrow region of the phase diagram where a direct co ntinuous Ising transition exists from the high temperature (disordered) pha se to the (quasi-) long range ordered phase. This constitutes a toy versio n of the `deconfined criticality' scenario. LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 2205 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20120604 DTEND;VALUE=DATE:20120607 DTSTAMP:20260828T094430Z UID:b5ndkqkl7n9a6726tuaso04f2k@google.com CREATED:20120426T162448Z DESCRIPTION:In celebration of Prof. Richard Mushotzky's 65th birthday\, the Joint Space Science Institute (JSI)\, the UMd Department of Astronomy\, an d NASA-Goddard are hosting a three day scientific\; meeting. Topics covered will include black holes\, active galactic nuclei\, the high-energy astrop hysics of galaxies\, galaxy clusters\, and cosmology. The meeting will conc lude with a discussion of high-energy astrophysics missions and a strategic discussion of future missions.\n\nConfirmed invited speakers:\n\n Len C owie (Hawaii)\n Chris Done (Durham\, UK)\n Andy Fabian (Cambridge\, U K)\n Michael Koss (Hawaii)\n Michael Loewenstein (NASA/GSFC)\n Mic hael McDonald (MIT)\n Eric Miller (MIT)\n Kirpal Nandra (MPE)\n An dy Ptak (NASA/GSFC)\n Norbert Schartel (ESA)\n Tadayuki Takahashi (IS AS\, Japan)\n Yoshihiro Ueda (Kyoto\, Japan)\n Meg Urry (Yale)\n L isa Winter (Colorado)\n\n\nScientific Organizing Committee:\n\n Keith Ar naud (NASA/GSFC)\n Amy Barger (U-Wisconsin)\n Michael Lowenstein (NAS A/GSFC)\n John Mulchaey (Carnegie Observatories\; Chair of SOC)\n Kir pal Nandra (MPE)\n Chris Reynolds (U-Maryland)\n Meg Urry (Yale)\n Lisa Winter (U-Colorado)\n\n\nFor further information or be included in fu ture announcements\, please contact Susan Lehr ( slehr@umd.edu).\n LAST-MODIFIED:20230127T203420Z LOCATION:Loews Annapolis Hotel SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Energetic Astronomy : Richard Mushotzky at 65 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101026T150000Z DTEND:20101026T163000Z DTSTAMP:20260828T094430Z UID:jljqg3lgjhc62j4q47cnud7138@google.com CREATED:20101021T192241Z DESCRIPTION:Title : Supercritical superfluid and vortex unbinding following a quantum quench\nSpeaker Name: Ludwig Mathey\nSpeaker Institution : NIST\ nNotes: website: http://www.physics.umd.edu/cmtc/seminars.html\nAbstract : We study the dynamics of the relative phase of a bilayer of two-dimensional \nsuperfluids after the two superfluids have been decoupled. We find that o n short time\nscales the relative phase shows `light cone' like thermalizat ion and creates a\nmetastable superfluid state\, which can be supercritical . On longer time scales this state\nrelaxes to a disordered state due to dy namical vortex unbinding. We study this effect\nboth numerically using trun cated Wigner approximation and analytically within a newly\nsuggested time dependent renormalization group approach (RG). In particular\, within\nRG w e show that there are two possible fixed points for the real time evolution \ncorresponding to the superfluid and normal steady states. So depending on the initial\nconditions and the microscopic parameters of the Hamiltonian the system undergoes a\nnon-equilibrium phase transition of the Kosterlitz- Thouless type. The time scales for\nthe vortex unbinding near the critical point are exponentially divergent\, similar to the\nequilibrium case. LAST-MODIFIED:20230127T203828Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120917T154500Z DTEND:20120917T163000Z DTSTAMP:20260828T094430Z UID:73ip0foiegrt93082260hk3mfs@google.com CREATED:20120912T173230Z LAST-MODIFIED:20230127T203912Z LOCATION:1305F "New Toll Room" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221014T160000Z DTEND:20221014T170000Z DTSTAMP:20260828T094430Z UID:0ucs6jhtns8thbpfugfu0ihlf9@google.com CREATED:20221008T002839Z DESCRIPTION:Title: Cavity Light-Matter Hybridization Driven by Quantum Flu ctuations\nSpeaker: Christian Eckhardt (Max Planck Institute for Structure and Dynamics of Matter)\nTime: Friday\, October 14\, 2022 - 12:00pm\nLoca tion: ATL 2324\n\nHybridizing light and matter by means of cavities can be used as a tool to influence material properties. In my talk I will discus s a model for strongly correlated fermions close to a quantum phase-transit ion coupled to a single mode of an optical cavity. Close to the critical po int\, light and matter degrees of freedom hybridize\, which can be observed in an increase in their entanglement. We show that this entanglement can b e related to fluctuations in the fermionic system that are in principle dir ectly measurable through Kubo response functions. Additionally\, correlati ons between fermions are enhanced in finite systems as a result of the ligh t-matter hybridization.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221008T002839Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Christian Eckhardt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221107T200000Z DTEND:20221107T213000Z DTSTAMP:20260828T094430Z UID:5m0nlssjsrfl0bmpv8jbqg5v8o@google.com CREATED:20220728T164348Z DESCRIPTION:Speaker: Clara Murgui\, Caltech



    Title : Hunting for Light DM with Quantum Sensors.

    Abstract: Direct detect ion experiments search for dark matter through its potential interactions w ith the SM particles. However\, light dark matter models with particle mass es below the GeV scale are still largely unconstrained. As we will see in t his talk\, sensitivity to such small momentum transfer can benefit from qua ntum sensors\, which employ fundamental quantum mechanical phenomena to not ice energy depositions otherwise unreachable. Quantum sensors can considera bly extend the range in dark matter mass of traditional WIMP experiments an d be complementary to other direct detection methods. In the first part of the talk\, I will examine a proposal to use atom interferometers to detect a light dark matter subcomponent at sub-GeV masses. DM scattering off of on e “arm” of the atom interferometer can cause trackable decoherence and phas e shifts. Two key factors render atom interferometers highly competitive ex periments for very low masses: they are sensitive to extremely low momentum deposition and their coherent atoms give them a boost in sensitivity. On t he second part of the talk\, I will present a novel proposal (ongoing work) to search for the QCD axion with optomechanical cavities. \; As we wil l see\, the population of coherent phonons that such cavities can host is c rucial to overcome the suppression from the QCD axion-photon coupling. A un ique advantage of this new strategy\, axioptomechanics\, is that the cavity size need no longer be matched to the axion mass. Rather the difference of the pump and probe laser frequencies is tuned to the difference in phonon energy and axion mass. \;
     LAST-MODIFIED:20221103T135858Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220927T180000Z DTEND:20220927T193000Z DTSTAMP:20260828T094430Z UID:00c4qfo7ej8bqv8b322ipbpuct@google.com CREATED:20220926T182620Z LAST-MODIFIED:20220926T182636Z LOCATION:PSC #2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Talk: Dr. Sriram Guddala\; Topic: light-matter interact ions in 2D materials integrated nanostructures TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100218T203000Z DTEND:20100218T213000Z DTSTAMP:20260828T094430Z UID:fkmt0ntnkhuq2o6b7c0bqk594c@google.com CREATED:20100213T155631Z DESCRIPTION:Speaker: Sam McKagan\, McKagan Enterprises\nTitle: Embodied Lea rning Activities: Using the body symbolically to\nsolve a physics problem\n Abstract: I will present a video analysis of a pedagogical technique called an\nEmbodied Learning Activity (ELA)\, in which students use their bodies\ nsymbolically to solve a physics problem. Our claim is that ELAs\nuniquely promote scientific reasoning. Using the body provides\naffordances for gr appling with deep issues in ways that other\ninstructional techniques do no t. This claim is based on our video\nanalysis\, and on a theoretical frame work grounded in Lakoff and\nJohnson’s work on embodied cognition and Ochs’ work on indeterminate\ngrammatical constructions. LAST-MODIFIED:20230127T203730Z LOCATION:PHYS 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PERG Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221102T193000Z DTEND:20221102T213000Z DTSTAMP:20260828T094430Z UID:051220ehqbja6i4pep091cbpgn@google.com CREATED:20220815T131214Z DESCRIPTION:

    Luis Rodriguez de Marcos\, NASA Goddard Space Fl ight Center and Catholic University

    Introduction to Optical Coatings and Applications

    ABSTRACT: Optical coatings are combinatio ns of thin film layers that modify the transmission or reflection propertie s of substrates in optical systems. Although we barely notice it\, optical coatings are everywhere today and have a tremendous impact on our daily liv es as they are essential components of modern optical systems. \; In th is (equation-free!) presentation\, I will quickly review the early modern h istory of optical coatings\, from the pioneering work in the XIX century to its boom during WW2. Next\, we will analyze the state-of-the-art of reflec tive coatings in a wide spectral range\, from the infrared to the x-rays\, commenting on key advances made over the last decades. Finally\, we will se e why the development of new coatings has been an enabling technology for t wo important applications: space astronomy and modern photolithography syst ems. \; From a more personal point of view\, I will comment on my past experiences working in this field in four different countries (on three dif ferent continents).

     \;BIO: Dr. Luis Rodriguez de Marcos received his Theoretical Physics degree (2 008) and his master’s degree in Mathematical-Physics (2010) from Universida d Complutense de Madrid\, in Spain. During his PhD with the coatings group at the Spanish Research Council (CSIC)\, he worked on the determination of optical properties of materials and in the development of optical coatings for the far UV (FUV) and extreme UV (EUV). He completed his PhD in 2015 and then he moved to Singapore in 2016 where he joined the Singapore Synchrotr on Light Source as a beamline scientist. There\, aside from working happily 23h per day on the EUV characterization of mask blanks for the next genera tion of photolithography systems\, he found some free time to play with the use of metamaterials in optics\, and play soccer\, his great passion. Afte r a short stay at the Tohoku University (Japan) early in 2019\, where aside from eating tons of Sushi he did a small research on gratings for X-rays i nterferometry\, Luis joined The Catholic University of America in April 201 9 as an assistant scientist.

     LAST-MODIFIED:20221028T195118Z LOCATION:3117 Computer Science Instructional Center Bldg #406 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221004T150000Z DTEND:20221004T160000Z DTSTAMP:20260828T094430Z UID:0mf2cuss4igkvtirquvfa8jl26@google.com CREATED:20220815T164704Z DESCRIPTION:Literature Seminar: Darnell Harris

    Tit le: \;Synthesis and Characterization of Selective Human Neuramin idase Inhibitors

    Abstract: \;    https://chem.umd.edu/events/synthesis-and-characterization-sele ctive-human-neuraminidase-inhibitors LAST-MODIFIED:20221004T142929Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110217T173000Z DTEND:20110217T183000Z DTSTAMP:20260828T094430Z UID:satvhfbcpa4llei9t1kal7b758@google.com CREATED:20110214T180733Z DESCRIPTION:Title: Dynamics of Heterogeneous Networks\nSpeaker: Prof. Joel Bader\nJohns Hopkins University\nWhitaker Biomedical Engineering Institute LAST-MODIFIED:20230127T203802Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100426T200000Z DTEND:20100426T210000Z DTSTAMP:20260828T094430Z UID:l37ls0gccjoo2sda54f6psa6sk@google.com CREATED:20100416T140654Z DESCRIPTION:Title : Mechanochemical Models for Motor Proteins\nSpeaker Name : Riina Tehver\nSpeaker Institution : University of Maryland\nNotes: Refres hments at 3:45pm LAST-MODIFIED:20230127T203101Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110222T160000Z DTEND:20110222T173000Z DTSTAMP:20260828T094430Z UID:aegs1ha3dum8pd5p67p5t9qmlc@google.com CREATED:20110218T164927Z DESCRIPTION:Title : Majorana modes at the ends of superconductor vortices i n doped topological insulators\nSpeaker Name: Pouyan Ghaemi\nSpeaker Instit ution : Berkeley\nNotes: CMTC Seminar List:\nhttp://www.physics.umd.edu/cmt c/seminars.html\nAbstract : Recent experiments have observed bulk supercond uctivity in doped topological insulators. In this talk I discuss that the v ortex Majorana zero modes\, previously predicted to occur when superconduct ivity is induced on the surface of topological insulators\, survive even in the doped systems with metallic normal states. We find that Majorana zero modes indeed appear but only below a critical doping. The critical doping i s associated with a topological phase transition of the vortex line\, where it supports gapless excitations along its length. Generally\, it is shown that the critical chemical potential depends only on the orientation of the vortex line\, and a Berry phase property of the normal state Fermi surface . We use this criterion and available band structures to argue that n-doped Bi$_2$Te$_3$ under pressure supports vortex end Majorana modes\, along wit h other materials candidates. Surprisingly\, even topologically trivial ban d structures in spin orbit materials\, when suitably doped\, may lead to su rface Majorana fermions.\n LAST-MODIFIED:20230127T203307Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120301T140000Z DTEND:20120301T230000Z DTSTAMP:20260828T094430Z UID:402873o9n0h4j0vf6qftsdc9tc@google.com CREATED:20120227T150921Z DESCRIPTION:For more information\, see http://www.clubofrome.org/?p=3392 LAST-MODIFIED:20230127T203407Z LOCATION:Rasmuson Theater of the National Museum of the American Indian at 4th Street and Independence Avenue\, SW on the National Mall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Perspectives on Limits to Growth: Challenges to Building a Sustaina ble Planet TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120228T190000Z DTEND:20120228T200000Z DTSTAMP:20260828T094430Z UID:msbovh9tltase7jtba8976nvio@google.com CREATED:20120209T191430Z DESCRIPTION:Title : The search for neutrinoless double beta decay with the EXO experiment\nSpeaker Name: Jesse Wodin\nSpeaker Institution : SLAC Natio nal Accelerator Laboratory\nAbstract : Enriched Xenon Observatory (EXO) is a series of experiments designed to search for the neutrinoless double beta decay (0nbb) of Xe-136. Observation of 0nbb would determine an\nabsolute m ass scale for neutrinos\, prove that neutrinos are massive Majorana particl es (indistinguishable from their own antiparticles)\, and constitute physic s beyond the Standard Model. The current phase of the experiment\, EXO-200\ , is operating and serves as a prototype for the 1-10 ton scale full-EXO ex periment. I will report on our recent observation of the two-neutrino (2nbb ) decay mode in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) +- 0.21 (sys.) x 1 0^21 yr. This second\norder process\, predicted by the Standard Model\, has been observed for several nuclei but not for Xe-136.\nAdditionally\, I wil l discuss current R&D towards the full-EXO experiment that combines aspects of nuclear and atomic physics\, and touch upon my other research plans in neutrino physics. LAST-MODIFIED:20230127T203642Z LOCATION:1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221004T160000 DTEND;TZID=America/New_York:20221004T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221004T160000 CREATED:20210423T130624Z DESCRIPTION:

    The inaugural Charles W . Misner Endowed Lecture in Gravitational Physics

    Sam Gralla\, University of Arizona

    Black holes: Seeing the Unseeable

    Black h oles emit no light of their own\, and absorb everything that crosses their event horizon. \; But they are not invisible\, and thanks to some spect acular breakthroughs of recent years\, now we can see them.&n bsp\; \;I will tell the remarkable story of black hole imaging and expl ain the science in simple terms: \; What are we looking at in a black h ole image\, and what do we learn from it? \; I will also describe the e xciting future of this new field\, with new telescopes and space missions s et to probe black holes in finer detail than ever before\, putting our unde rstanding of gravity to the ultimate test.

    Bio: \;Prof. Gralla w orks in gravitational physics at the intersection of theory and experiment\ , with an emphasis on black holes. He is widely regarded as an effective pu blic speaker\, with his recorded lectures receiving hundreds of thousands o f views online. \;https:// youtu.be/Dn33_ySzB-w

    https://umdphysics.umd.edu/event s/misner-lect.html

    < /u>     LAST-MODIFIED:20220929T122412Z LOCATION:1410 John S. Toll Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Charles W. Misner Lecture/Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090929T100000 DTEND;TZID=America/New_York:20090929T120000 DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com RECURRENCE-ID;TZID=America/New_York:20090929T100000 CREATED:00010101T000000Z DESCRIPTION:GRAPHENE & QPT\nQiuzi Li\, Temperature dependence of compressib ility in 2D system\nEnrico Rossi\, Signatures of Klein tunneling in disorde red graphene p-n-p junction\nEuyheon Hwang\, Screening in graphene and its consequences\nRoman Lutchyn\, Dissipation-driven quantum phase transition i n super-conductor-graphene systems\n\nhttp://www.physics.umd.edu/cmtc/semin ars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221102T170000Z DTEND:20221102T180000Z DTSTAMP:20260828T094430Z UID:5sjmus4d5k5v0m71c2uppt35bg@google.com CREATED:20221101T015332Z DESCRIPTION:Title:  Lattice-Based Quantum Advantage from Rotated Measuremen ts
    Speaker:  Carl Miller (QuICS)
    Time:  Wednesday\, November 2\, 2022 - 1:00pm
    Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

    Trapdoor claw-f ree functions are immensely valuable in cryptographic interactions between a classical client and a quantum server. Typically\, a protocol has the qua ntum server prepare a superposition of two-bit strings of a claw and then m easure it using Pauli-X or Z measurements. This talk will explain a new tec hnique that uses the entire range of qubit measurements from the XY-plane.  This technique substantially enhances what we are able to do cryptographic ally with a single claw-state.  I will discuss two applications: proofs of quantumness and remote state preparation.

    Reference: Y. Alnawakhtha \, A. Mantri\, C. Miller\, D. Wang\, “Lattice-Based Quantum Advantage from Rotated Measurements\,” arXiv:2210.10143 (2022). LAST-MODIFIED:20221101T015332Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Carl Miller TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091109T161500Z DTEND:20091109T173000Z DTSTAMP:20260828T094430Z UID:t4cv6egt0kaabbapcj7kn9knc0@google.com CLASS:PUBLIC CREATED:20091023T192407Z DESCRIPTION:Title: Conformal vs. Confining Scenario in SU(2) with Adjoint F ermions\n\nSpeaker Name: Agostino Patella\nInstitute: Swansea University\, Wales UK\n\nAbstract: Technicolor is a mechanism for electroweak symmetry breaking\, alternative to the Higgs field. A gauge theory (technicolor sect or) is coupled to the electroweak sector\, and electroweak symmetry breakin g is induced by techni-chiral symmetry breaking. While a rescaled version o f QCD was excluded as technicolor model several years ago\, theoretical dev elopments in the last years have shown that gauge theories close to the con formal window are possible good candidates.\nSU(2) with two Dirac fermions in the adjoint representation is one of these candidates. Understanding whe ther this theory is confining or IR-conformal is a challenging problem\, wh ich can be addressed by means of numerical simulations. I will present the most recent spectrum measurements\, both in the mesonic and gluonic sectors close to the chiral limit. I will discuss some hints of conformal physics\ , and how the systematic errors still prevent us from drawing any solid con clusion.\n LAST-MODIFIED:20230127T203247Z LOCATION:Physics\, Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quarks\, Hadrons & Nuclei Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111114T173000Z DTEND:20111114T183000Z DTSTAMP:20260828T094430Z UID:tllglt62l61ht3kjai9n8ij8nk@google.com CREATED:20110922T134407Z DESCRIPTION:TITLE: From ultracold Fermi gases to Neutron Stars\nSPEAKER: C. Salomon\nINSTITUTION: Département de physique de l’Ecole Normale Supérieu re\, CNRS\, UPMC 24 rue LHOMOND\, 75231 Paris\, France\nABSTRACT: Ultracol d dilute atomic gases can be considered as model systems to address some pe nding problem in Many-Body physics that occur in condensed matter systems\, nuclear physics\, and astrophysics. We have developed a general method to probe with high precision the thermodynamics of locally homogeneous Bose an d Fermi gases [1\,2\,3]. This method allows stringent tests of recent many- body theories. For attractive spin 1/2 fermions with tunable interaction (6 Li)\, we will show that the gas thermodynamic properties can continuously c hange from those of weakly interacting Cooper pairs described by Bardeen-Co oper-Schrieffer theory to those of strongly bound molecules undergoing Bose -Einstein condensation. First\, we focus on the finite-temperature Equation of State (EoS) of the unpolarized unitary gas. Surprisingly\, the low-temp erature properties of the strongly interacting normal phase are well descri bed by Fermi liquid theory [4] and we localize the superfluid phase transit ion. A detailed comparison with theories including Monte-Carlo calculations has revealed some surprises and the Lee-Huang-Yang corrections for low-den sity bosonic and fermionic superfluids are quantitatively measured for the first time. Despite orders of magnitude difference in density and temperatu re\, our equation of state can be used to describe low density neutron matt er such as the outer shell of neutron stars. \n\n[1] S. Nascimbène\, N. Nav on\, K. Jiang\, F. Chevy\, and C. Salomon\, Nature 463\, 1057 (2010)\n[2] N . Navon\, S. Nascimbène\, F. Chevy\, and C. Salomon\, Science 328\, 729 (2 010)\n[3] N. Navon\, S. Piatecki\, K. Günter\, B. Rem\, T. C Nguyen\, F. Ch evy\, W. Krauth\, and C. Salomon\,\narXiv 1103.4449\, Phys. Rev. Lett. in p ress (2011)\n[4] S. Nascimbène\, N. Navon\, S. Pilati\, F. Chevy\, S. Giorg ini\, A. Georges\, and C. Salomon\, Phys. Rev. Lett. 106\, 215303 (2011) \n LAST-MODIFIED:20230127T203455Z LOCATION:PHYSICS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SEMINAR-CHRISTOPHE SALOMON TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130427T180000Z DTEND:20130427T190000Z DTSTAMP:20260828T094430Z UID:71b35h7an42ad5iu85d858m5sk@google.com CREATED:20130424T194936Z DESCRIPTION:SPEAKER: Christopher Monroe\, Joint Quantum Institute and the U niversity of Maryland\n\nTITLE: Quantum Weirdness and the Future of Computi ng\n\nABSTRACT: When matter is broken down to its simplest building blocks such as individual atoms or electrons\, the weird laws of quantum mechanic s take over. Here\, particles behave as waves\, there is inherent uncertai nty\, and the mere act of observation can affect the system. These bizarre features were largely considered as curiosities over the last century\, bu t now we see they may be useful for a new type of computer that would be mo re powerful than any possible PC\, iPad or other device based on current ci rcuit technology. The trick is to isolate quantum particles and control th em “without looking.” We will look in depth at one of the most promising t ypes of quantum hardware\, including a remote visit to one of the laborator ies at the UMD Joint Quantum Institute\, where individual atoms are levitat ed with electric fields and prodded with laser beams in order to store and manipulate information the quantum way. LAST-MODIFIED:20230127T203826Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL MD DAY LECTURE TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110418T150000 DTEND;TZID=America/New_York:20110418T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110418T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Anomalous Dimensions of Double-Trace Operators from Ad S/CFT"\n[Speaker] David Shih\n[Institution] Rutgers University\n[Abstract] In this talk I will describe a new method for computing the leading-order a nomalous dimensions of double-trace operators in 4d SCFTs with weakly-coupl ed gravity duals. This new method considerably simplifies previous approach es based on the four-point function. Studying a minimal toy model\, I will show that for a range of parameters\, the anomalous dimension of $\\phi^\\d agger \\phi$ can be positive. Finally\, I will discuss the potential applic ations of this to SUSY model building. \n LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120215T200000Z DTEND:20120215T210000Z DTSTAMP:20260828T094430Z UID:1qa1u5ms19g4v9tjsietu42mo8@google.com CREATED:20120209T150825Z DESCRIPTION:Title: Thermal properties of multiwalled carbon nanotubes probe d with Electron Thermal Microscopy\nSpeaker: Dr. Merijntje Bronsgeest\, Dep artment of PhysicsUniv\, ersity of Maryland LAST-MODIFIED:20230127T203810Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Park \, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221024T190000Z DTEND:20221024T203000Z DTSTAMP:20260828T094430Z UID:3se4b3tct2augo0ohrtmigepsj@google.com CREATED:20220818T140515Z DESCRIPTION:Speaker: Erwin Tanin\, JHU

    Title: \;Thermal Perturbations from Cosmological Constant Relaxation

    Abs tract: \;We probe the cosmological consequences of a recently propo sed class of solutions to the cosmological constant problem. In these model s\, the universe undergoes a long period of inflation followed by a contrac tion and a bounce that sets the stage for the hot big bang era. A requireme nt of any successful early universe model is that it must reproduce the obs erved scale-invariant density perturbations at CMB scales. While this \ ;class of models involve a long period of inflation\, the inflationary Hubb le scale during their observationally relevant stages is at or below the cu rrent Hubble scale\, rendering the de Sitter fluctuations too weak to seed the CMB anisotropies. We show that sufficiently strong perturbations can st ill be sourced thermally if the relaxion field serving as the inflaton inte racts with a thermal bath\, which can be generated and maintained by the sa me interaction. We present a simple model where the relaxion field is deriv atively (i.e. technically naturally) coupled to a non-abelian gauge sector\ , which gets excited tachyonically and subsequently thermalizes due to its nonlinear self-interactions. This model explains both the smallness of the cosmological constant and the amplitude of CMB anisotropies.
     LAST-MODIFIED:20221019T135817Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100407T210000Z DTEND:20100407T220000Z DTSTAMP:20260828T094430Z UID:d9rtfcc1718stb2ii08kktfqec@google.com CREATED:20100401T192801Z DESCRIPTION:Title: Science\, Technology\, and Innovation Policy: A View fro m the White House\n\nWho: Dr. Steve Fetter\, Assistant Director-at Large in the White House Office of Science and Technology Policy\n\nBio: Dr. Fetter has been a member of the University of Maryland\, School of Public Policy' s faculty since 1988\, serving as dean from 2005 to 2009. He is currently o n leave as Assistant Director-at Large in the White House Office of Science and Technology Policy. His interests include nuclear arms control and nonp roliferation\, nuclear energy and effects of radiation\, and climate change and carbon-free energy supply. He has been an advisor to several governmen t agencies\, scientific organizations\, and nongovernmental organizations\, and has held visiting positions at Stanford\, Harvard\, and MIT. He receiv ed a Ph.D. in energy and resources from the University of California\, Berk eley\, and an S.B. in physics from MIT.\n\nOther info: Attendees who regist er to attend ahead of time (and are present) are eligible to win an Amazon Kindle\, an iPod Nano\, and other prizes. To register\, please go to gsg.um d.edu/grid/registration and follow the "General Registration" link. \n LAST-MODIFIED:20230127T203408Z LOCATION:Colony Ballroom\, Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Graduate Research Interaction Day Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100421T163000Z DTEND:20100421T173000Z DTSTAMP:20260828T094430Z UID:1ckctqfcd3pm99ssdaetbvueeo@google.com CREATED:20100308T150532Z DESCRIPTION:SPEAKER: Renee Fatemi\n\nAFFILIATION: Univ of Kentucky\, Lexing ton\n\nTITLE: Extracting the Gluon Piece of the Spin Puzzle Inclusive Jet a nd Pion Results from Star\n\nABSTRACT: Unraveling the nucleon spin puzzle has been the focus of experimental and theoretical efforts since polarized deep-inelastic scattering (DIS) experiments found that the quark contributi on to the nucleon spin is small. Subsequently\, measurements sensitive to the gluon contribution ($\\Delta{G}$) to the total spin of the nucleon have been widely pursued and is a flagship effort within the STAR Spin program. This talk will focus on results from the mid-rapidity inclusive jet ($\\v ec{p}+\\vec{p}\\rightarrow jet+X$ )\, charged and neutral pion ($\\vec{p}+\ \vec{p}\\rightarrow\\pi+X$) channels at $\\sqrt{s}=200$ GeV\, and the sub stantial new constraints placed on $\\Delta{G}$ when compared to those from a next-to-leading order analysis of DIS data. Future STAR plans for contin ued progress on $\\Delta{G}$ measurements will be discussed. LAST-MODIFIED:20230127T203519Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20080916T200000Z DTEND:20080916T210000Z DTSTAMP:20260828T094430Z UID:s1l6iefhpg0126ht1u6q5385gk@google.com CREATED:20080912T160051Z DESCRIPTION:Speaker:Jim Drake\, University of Maryland\nTitle:"Magnetic Rec onnection: A Mechanism for Cosmic Particle Acceleration"\n LAST-MODIFIED:20230127T203621Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221013T140000Z DTEND:20221013T150000Z DTSTAMP:20260828T094430Z UID:3nj6nks63m6kf05ep9312e6ipq@google.com CREATED:20221003T005650Z DESCRIPTION:Title:  Statistical mechanics models for hybrid quantum circuit s
    Speaker:  Romain Vasseur (UMass Amherst)
    Time:  Thursday\, October 13\, 2022 - 10:00am
    Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390

    The ce ntral philosophy of statistical mechanics and random-matrix theory of compl ex systems is that while individual instances are essentially intractable t o simulate\, the statistical properties of random ensembles obey simple uni versal “laws”. This same philosophy promises powerful methods for studying the dynamics of quantum information in ideal and noisy quantum circuits – f or which classical description of individual circuits is expected to be gen erically intractable. In this tutorial-style talk\, I will review recent pr ogress in understanding the dynamics of quantum information in ensembles of random hybrid  (including measurements\, dissipation etc.) quantum circuit s through a stat. mech. lens. In particular\, I will discuss how various qu antities of interest can be computed using exact mappings onto replicated s tatistical mechanics models. LAST-MODIFIED:20221003T005650Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Romain Vasseur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121106T190000Z DTEND:20121106T200000Z DTSTAMP:20260828T094430Z UID:4aps9ispfnv9nal6qm00bs1eg8@google.com CREATED:20121106T161133Z DESCRIPTION:Title : The Fusion Research Programme in Costa Rica\n\nSpeaker Name: Dr. Celso Ribeiro\n\nSpeaker Institution : Technological Institute of Costa Rica LAST-MODIFIED:20230127T202945Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121012T140000Z DTEND:20121012T210000Z DTSTAMP:20260828T094430Z UID:eaemmtmj81jgi7sk964ajfg3ak@google.com CREATED:20121004T122854Z DESCRIPTION:(talks 30 minutes followed by 15 minutes of discussion)\n\nSpea kers and Titles: \n\n10:00 AM – 12:15 PM\nVictor Galitski\, “Stimulation of quantum phases by time-dependent perturbations”\nEd Barnes\, “Electron spi n decoherence in a polarized nuclear spin bath”\nSo Takei\, “Microscopic th eory for a ferromagnet-superconductor heterostructure: Transport\, fluctuat ions and\ntopological superconductivity”\n\n12:15 PM – 1:15 PM Break for lu nch\n\n1:15 PM – 5:00 PM \n(talks 30 minutes followed by 15 minutes of disc ussion)\nAlejandro Lobos\, “Manipulating Majorana Fermions in Quantum Nanow ires with Broken Inversion\nSymmetry”\nBenjamin Fregoso\, "Effects of magne tic and potential disorder in topological wires with Majorana fermions"\nAn drea Di Ciolo\, “Spin models on frustrated honeycomb lattices: a Variationa l Monte Carlo study”\nKostya Kechedzhi\, “Gate tunable quantum transport in double layer graphene”\nDavid Abergel\, “Inhomogeneity and nonlinear scree ning in gapped bilayer graphene”\n\nhttp://www.physics.umd.edu/cmtc/seminar s/CMTC%20Symposium%20Fall%202012_flyer.pdf LAST-MODIFIED:20230127T203527Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120126T183000Z DTEND:20120126T190000Z DTSTAMP:20260828T094430Z UID:c1j293qvif858behoeje7llp34@google.com CREATED:20120104T160222Z LAST-MODIFIED:20230127T203022Z LOCATION:Rm 1305F\, (the new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091207T173000Z DTEND:20091207T183000Z DTSTAMP:20260828T094430Z UID:g133rufojpb8blgtqanb4ou240@google.com CREATED:20091008T134215Z DESCRIPTION:Title : Non-equilibrium Dynamics of Strongly Interacting Bosoni c and Fermionic Quantum Gases Speaker Name: : Immanuel Bloch Speaker Instit ution : Max Planck Institute for Quantum Optics Abstract : Ultracold quantu m gases offer novel and intriguing possibilities to probe the dynamical evo lution of strongly correlated quantum systems far from equilibrium. We repo rt on recent experiments\, in which we have analyzed the transport behaviou r of fermionic quantum gases in an optical lattices. We find three distinct transport regimes for non-interacting\, weakly- and strongly-interacting q uantum gas mixtures for both attractive and repulsive interactions. In a se cond series of experiments we probe the quantum dynamics of 1D ladder syste ms far from equilibrium. Here we investigate generalized Landau-Zener trans itions between two Luttinger liquids\, for which we find striking effects o f ground state phase transitions that manifest in the dynamical evolution o f the system. Finally\, we report on our recent experimental progress towar ds single atom and single site addressing in a 3D optical lattice using a h igh numerical aperture optical microscope. LAST-MODIFIED:20230127T203559Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100408T170000Z DTEND:20100408T180000Z DTSTAMP:20260828T094430Z UID:70ao7si57q41mvuett4jiirgs8@google.com CREATED:20100401T173846Z DESCRIPTION:Title: Medium Scale Multiprocessor Systems: SiCortex\, and the Advantages of a Modest Ambition\n \nBy: Matt Reilly\n \nAbstract:\nThe para llel processing community has devoted much of its attention to the problem of system design on a massive scale. While important\, such systems are ver y different from those deployed in industrial and academic production envir onments. Today's peta-scale systems and tomorrow's exa-scale systems can be likened to aircraft carriers\, while most production multiprocessor instal lations would be tugboats\, trawlers\, and freighters. All float in the wat er\, but their design considerations and the economic roles they play are q uite different.\n \nSiCortex set out\, in 2004\, to design a bounded multip rocessor system of 972 cluster nodes contained in a single system cabinet. This presentation will review the SiCortex architecture\, and discuss the p articular advantage it took of its bounded ambition. In light of the lesson s learned\, a small team of SiCortex alumni developed a plan for a new syst em\, scalable to 4096 nodes\, offering high performance internode communica tion\, and the potential to integrate heterogeneous computing elements. The presentation will review some of their conclusions.\n \nPerhaps chief amon g the advantages of a bounded system architecture is the possibility of a n etwork topology that reduces average message path length. The proposed syst em is based on a modification of the familiar and well-examined 3D torus to pology. LAST-MODIFIED:20230127T203121Z LOCATION: 8050 Greenmead Dr.\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SSpecial Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081015T193000Z DTEND:20081015T203000Z DTSTAMP:20260828T094430Z UID:lo00si2mod8po01dmtnsudek2s@google.com CREATED:20081003T145349Z DESCRIPTION:Title: Fraud\, Fakes\, and Forgeries - The Chemistry of Docume nts\nSpeaker: Dr. Tony Cantu\, Forensic Services Division\, U.S. Secret Ser vice LAST-MODIFIED:20230127T203152Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230130T210000Z DTEND:20230130T220000Z DTSTAMP:20260828T094430Z UID:4nu6eui25p8aapa29uarobvvn2@google.com CREATED:20230120T192709Z DESCRIPTION: The giant nesprin-1/2 ortholog ANC-1 anchors organelles through regulating macromolecular crowding


    < b>Speaker    : GW Gant Luxton\, University of California-Davis

    Abstract: < span>Macromolecular crowding considerably influences biochemical reaction r ates and the physical properties of intracellular environments. Recent adva nces have made progress on how crowding is modulated in individual cultured cells by regulating ribosome concentrations. However\, the mechanisms that regulate molecular crowding throughout development in multicellular in vivo contexts are largely unexplored. Here\, we used genetically encode d multimeric nanoparticles (GEMs) to study the physical properties of the c ell interior within developing tissues of the multicellular organism\, C . elegans. GEMs are homomultimeric scaffolds fused to a green fluoresce nt protein that self-assemble into bright\, stable particles 40 nm in diame ter. To use GEMs to perform single-particle tracking nanorheology experimen ts in vivo\, we engineered C. elegans strains stably expressi ng 40 nm GEMs under the control of tissue-specific promoters in the hypoder mis\, intestine\, and neurons. GEMs exhibited tissue-specific effective dif fusion coefficients. We observed more immobile GEMs in the hypodermis and i ntestine than we observed in neurons or previously reported in individual y east\, or mammalian tissue culture cells. Previous nanorheology studies per formed in cultured mammalian cells identified the conserved nuclear envelop e-spanning linker of nucleoskeleton and cytoskeleton (LINC) complex as a ke y determinant of cellular mechanical stiffness. Interestingly\, we recently demonstrated that the nesprin-1/2 ortholog ANC-1 controls the intracellula r positioning of the endoplasmic reticulum\, nuclei\, lipid droplets\, and mitochondria through a LINC complex-independent mechanism. Therefore\, we h ypothesized that ANC-1 anchors organelles through regulating macromolecular crowding. We found that the effective GEM diffusion coefficients were cons iderably increased in C. elegans intestinal or hypodermal cells lack ing ANC-1. In contrast\, no significant effect on GEM mobility was observed in strains null for the SUN protein UNC-84\, or harboring muscular dystrop hy-associated mutations in the nuclear lamin protein\, LMN-1. Furthermore\, we demonstrate that ANC-1 is required for the homogeneous cytoplasmic dist ribution of ribosomes in vivo. Collectively\, these results establis h a LINC complex-independent role for ANC-1 in controlling the mesoscale bi ophysical properties of the cytoplasm in vivo across several differe nt tissues.

     

    Seminars start at 4:00 pm\, and refres hments will be served at 3:45 pm. All seminars are held in the Conference R oom (1116) of the Institute for Physical Science and Technology (IPST) Buil ding unless otherwise noted.

    LAST-MODIFIED:20230120T192926Z LOCATION:1116 IPST SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100909T140000 DTEND;TZID=America/New_York:20100909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20101209T190000Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com CREATED:00010101T000000Z DESCRIPTION:[Title] TBA\n[Speaker] TBA\n[Institution] TBA\n[Abstract] TBA\n [Note] Refreshment is served at 1:30pm in the lobby of Physics Building. LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130530T170000Z DTEND:20130530T190000Z DTSTAMP:20260828T094430Z UID:l4f79hca4k9rbgsb485tigm10k@google.com CREATED:20130508T135713Z DESCRIPTION:Speaker: Alessandro Restelli\nInstitution: Joint Quantum Instit ute\nTwo Course lecture series\, May 29th and May 30th\nAbstract: In modern Physics laboratories building custom electronic instrumentation is a funda mental step in the design of many cutting-edge experiments. Often commercia l instrumentation is not available for a particular experiment simply becau se\, due to the novelty of the setup\, the needed functionality or specific ation has never been required before. Design and troubleshooting of analogu e or mixed analogue-digital electronics is therefore an important and incre asingly required set of skills in the career of an experimental physicist. In this seminar I will provide suggestions and rules of thumb for successfu l PCB (printed circuit board) layout using modern SMDs (surface mount devic es). Some of the topics covered during the seminar will be: reduction of in terference and ground loops in low noise and high frequency analog design\, differential signaling\, power supply design and successfully mechanical a ssembly and troubleshooting during prototyping. LAST-MODIFIED:20230127T203825Z LOCATION:1402 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Short Course: Building custom electronic instrumentation: hints for successful printed circuit board layout and use of modern commercial c omponents. TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090226T190000Z DTEND:20090226T200000Z DTSTAMP:20260828T094430Z UID:pvhq4n0jdjhusbdlmp89dbb0mo@google.com CREATED:20090217T205359Z DESCRIPTION:Title: Primordial Non-Gaussianities from Inflation : current bo unds and future prospects\nSpeaker: Eugene Lim\, Columbia University\nMore Information: Abstract: \nThe hint of a possible detection of primordial non -Gaussianities in the recent WMAP5 Cosmic Microwave Background data has rec ently brought the studies of primordial non-Gaussianities into the forefron t of precision cosmology. In this talk\, I will give an overview of both th e theoretical and observational bounds on primordial non-Gaussianities\, fo cusing primarily on the CMB. On the theory side\, I will review the current computational techniques and discuss future improvements and applications. On the observational side\, I will talk about the latest constraints from the WMAP5 data and prospects of obtaining even better bounds from future ex periments and data analysis techniques. LAST-MODIFIED:20230127T203826Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100401T193000Z DTEND:20100401T203000Z DTSTAMP:20260828T094430Z UID:qn5gsfot0t7q63m480u7h4h284@google.com CREATED:20100310T140311Z DESCRIPTION:[Speaker] Stefano Profumo\n[Institution] University of Californ ia\, Santa Cruz \n[Title] "COSMIC RAYS AND THE QUEST FOR NEW PHYSICS"\n[Abs tract] Recent cosmic ray data\, notably from the Pamela and Fermi satellite s\, indicate that previously unaccounted-for powerful sources in the Galaxy \ninject high-energy electrons and positrons. Interestingly\, this new sour ce class might be related to new fundamental particle physics\, and specifi cally to pair-annihilation or decay of galactic dark matter. I will\ndiscus s how this exciting scenario is constrained by Fermi gamma-ray observations \, and which astrophysical source counterparts could also be responsible fo r the high-energy electron-positron excess. In particular\, I\nwill review the case for nearby mature pulsars\, and the impact of newly discovered rad io-quiet pulsars that pulsate in gamma rays. While high-energy electron-pos itron measurements sample local (closer than 1\nkpc) cosmic rays\, diffuse radio and gamma-ray emission informs us about the global galactic cosmic ra y population. I will thus offer a few thoughts on recent claims involving t he detection of diffuse radio ("WMAP\nhaze") and gamma-ray ("Fermi haze") e missions and on implications for the quest for New Physics LAST-MODIFIED:20230127T203419Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221110T193000Z DTEND:20221110T203000Z DTSTAMP:20260828T094430Z UID:3v6i1kdufnolva4nlksvsrtrqu@google.com CREATED:20221031T153636Z DESCRIPTION:Literature Seminar

    Speaker: Yayra Tuani\, UMCP

    Ti tle: \;13C‐I sotope-Assisted Assessment of Metabolic Quenching During Sample Collection from Suspension Cell Cultures LAST-MODIFIED:20221031T153700Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101109T160000Z DTEND:20101109T173000Z DTSTAMP:20260828T094430Z UID:grkg2ljhuu54u0c3ujh39fnbo0@google.com CREATED:20101105T130000Z DESCRIPTION:Title : A Bose-Einstein condensate subject to synthetic gauge f ields\nSpeaker Name: Ian Spielman\nSpeaker Institution : JQI\nNotes: http:/ /www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20230127T203733Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100330T160000 DTEND;TZID=America/New_York:20100330T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100330T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Alan Nathan\, University of Illinois\, Urbana-Ch ampaign\nTitle: "Baseball and Physics: An Intersection of Passions" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110620T190000Z DTEND:20110620T200000Z DTSTAMP:20260828T094430Z UID:qcbiap0cb33v908n2q0frrqfq4@google.com CREATED:20110610T210845Z DESCRIPTION:Title: "Wjj\, the Tevatron\, and Technicolor"\nSpeaker: Adam Ma rtin\nInstitution: Fermilab LAST-MODIFIED:20230127T203630Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100128T171500Z DTEND:20100128T181500Z DTSTAMP:20260828T094430Z UID:qc13e939narq1koj3kafdof5so@google.com CREATED:20100125T155242Z DESCRIPTION:Title : Applied Dynamics Seminar - Regularization of Tunneling Rates in Quantum Chaos\nSpeaker Name: Louis pecora\nSpeaker Institution : N aval Research Laboratory LAST-MODIFIED:20230127T203750Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081201T190000Z DTEND:20081201T200000Z DTSTAMP:20260828T094430Z UID:ffmsllqsc023q2b6f5l7kfvvo8@google.com CREATED:20080915T192106Z DESCRIPTION:Speaker:Seth Quackenbush\, University of Wisconsin\, Madison\nW eb site: http://www.wisc.edu/\nTitle:"TBA"\n LAST-MODIFIED:20230127T203407Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120213T173000Z DTEND:20120213T183000Z DTSTAMP:20260828T094430Z UID:iboof3fjeqr8fsskibv8efc2a8@google.com CREATED:20120208T212914Z DESCRIPTION:Speaker: Sergey Polyakov\nTitle: Toward practical quantum com puting: Old principles and new challenges\nAbstract: Recently\, most of t he components needed for quantum information processing have been demonstra ted in proof of principle experiments. Practical quantum computing adds a l ong list of additional requirements to the hardware\, and in many cases the technology behind a proof of concept experiment cannot satisfy all of them . That calls for new\, at times fundamentally new\, approaches. \nIn my tal k I will cover two projects aimed at bridging the gap between earlier exper iments and needs of a practical quantum computer.\n1) Solid-state quantum m emory: Robust quantum memories to connect photonic and matter-based qubits are important for scalable quantum information protocols. Here we report ou r progress on developing a DLCZ-compatible memory in a solid state Pr+3:YSi O5\, a rare-earth doped crystal. A solid state quantum memory would offer a low experimental overhead and long coherence times\, compared with the dem onstrated systems. We demonstrate recording\, storage and retrieval of spin waves - a necessary preliminary step in development of such memory. We int roduce a simple model that gives an upper bound of cross correlations\, and demonstrate that our system performs close to its theoretical limit. \n2) Hybrid Quantum Interfaces: In building "quantum buses"\, that help exchange quantum information between the blocks of a quantum computer\, it is essen tial to generate identical quantum states from dissimilar systems. We show that single photons created in a fundamentally different process - parametr ic down-conversion in a nonlinear crystal - can be manipulated to be indist inguishable from those from quantum dots. \n LAST-MODIFIED:20230127T203538Z LOCATION:Physics 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI-SEMINAR - SERGEY POLYAKOV TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221216T170000Z DTEND:20221216T180000Z DTSTAMP:20260828T094430Z UID:58sapfelvh2r5ucu6hc1rbq4lh@google.com CREATED:20221209T153502Z DESCRIPTION:Title: Fusion category symmetry-protected topological order in the generalized cluster state\nSpeaker: Christopher Fechisin (QuICS)\nTim e: Friday\, December 16\, 2022 - 12:00pm\nLocation: ATL 2324\n\nDespite g rowing interest in beyond-group symmetries in quantum condensed matter syst ems\, there are relatively few microscopic lattice models explicitly realiz ing these symmetries\, and many phenomena have yet to be generalized at the microscopic level. In this work\, we show that the generalized cluster sta te introduced in arXiv:1408.6237 is an SPT protected by categorical symmetr y. We introduce a generalized Pauli stabilizer Hamiltonian which has the ge neralized cluster state as its ground state and study the generalization of several characteristic signatures of SPT order: string order\, protected e dge modes\, algebraic structure under stacking\, and topological response. We also discuss how the generalized cluster state can be used as a universa l resource for measurement-based quantum computation (MBQC).\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221209T153502Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Christopher Fechisin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111107T160000Z DTEND:20111107T170000Z DTSTAMP:20260828T094430Z UID:ku9o1l6r4nkes1ct0lrdv864n8@google.com CREATED:20111103T195627Z DESCRIPTION:Speaker: John Morton\, Oxford University\nTitle: Ultrafast ent angling gates between nuclear spins using optically excited triplet states\ nAbstract: Entanglement is a necessary ingredient in most emerging quantum technologies\, including quantum repeaters\, quantum information processing (QIP) and the strongest forms of quantum cryptography. Nuclear spins\, suc h as those in liquid state nuclear magnetic resonance have been powerful in the development of quantum control methods\, however\, due to the weak nuc lear spin polarisation\, these demonstrations contained no entanglement and ultimately constitute classical simulations of quantum algorithms. Further more\, nuclear spins exhibit very weak interactions (often in the range 10 - 100 Hz)leading to slow gate operation times.\n\nWe have shown how a coupl ed electron spin can be used to hyperpolarise 31P nuclear spins in silicon\ , to obtain an initial state of sufficient purity to create an entangled st ate between the two spins [1]. The state was verified using density matrix tomography based on geometric phase gates\, and had a fidelity of 98% compa red with the ideal state at this field and temperature (3.4 T\, 2.9 K). A c oupled electron spin can also dramatically reduce time taken to perform sin gle-qubit gates to nuclear spin\, using Aharanov-Anadan geometric phase gat es [2].\n\nHowever\, in both cases\, the long nuclear spin coherence time ( which can exceed seconds) is compromised by the permanent presence of a cou pled electron spin [3]. Here we report how a transient electron spin\, aris ing from an optically excited triplet state\, can be used to hyperpolarise\ , couple and measure two nearby nuclear spins. The presence of the triplet state alone enhances the nuclear-nuclear coupling by two orders of magnitud e over that of the ground state. We further extend this enhancement to five orders of magnitude by exploiting the spinor nature of the electron\, redu cing the nuclear spin entangling gate time to hundreds of nanoseconds. We f ind that different nuclear spin Bell states show different decoherence rate s\, giving insights into decoherence induced by the temperature presence of the triplet state. The entangling gate we demonstrate can be widely applie d to systems comprising an electron spin coupled to multiple nuclear spins. \n\n[1] S. Simmons et al. Entanglement in a Solid State Spin Ensemble\, Nat ure 470 69 (2011)\n[2] JJL Morton et al.\, Bang-bang control of fullerene q ubits using ultra-fast phase gates\, Nature Physics 2 40 (2006)\n[3] JJL Mo rton et al. Solid state quantum memory using the 31P nuclear spin\, Nature 455 1085 (2008) LAST-MODIFIED:20230127T203708Z LOCATION:Physics Bldg.\, Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090410T170000Z DTEND:20090410T180000Z DTSTAMP:20260828T094430Z UID:rfvl6cvniss7oua2m4s6bs4e3c@google.com CREATED:20090407T143126Z DESCRIPTION:Title: “The Why and How of Doping Semiconductor Nanostructures” \nDr. Steve Erwin\, Center for Computational Materials Science Naval Resear ch Laboratory LAST-MODIFIED:20230127T203156Z LOCATION:Rm. 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220125T180000Z DTEND:20220125T190000Z DTSTAMP:20260828T094430Z UID:4346c88klrsqsuaiacjiosrg3q@google.com CREATED:20220120T140617Z LAST-MODIFIED:20230127T203405Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080915T200000Z DTEND:20080915T210000Z DTSTAMP:20260828T094430Z UID:9p39euaec1a22o0om4g8s30uag@google.com CREATED:20080912T154534Z DESCRIPTION:Speaker:Daniel H. Reich\, Johns Hopkins University\nTitle:"Prob ing cell mechanics and cell-cell interactions with tailored magnetic nanopa rticles" LAST-MODIFIED:20230127T203910Z LOCATION:IPST Building\, Room: 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100414T193000Z DTEND:20100414T203000Z DTSTAMP:20260828T094430Z UID:9jjmdco4e1eg0s6ov7r8kqhmf0@google.com CREATED:20100409T195556Z DESCRIPTION:Title: Photonic Crystal Fibers for High Energy Lasers\nBy: Dr. E. Joseph Friebele\nNaval Research Laboratory\n \nAbstract:\nOne of the key elements in high energy lasers for directed energy weapons or manufacturin g applications is power scaling. Optical fibers whose cores are doped with laser-active ions offer the advantages of distributed gain over long fiber lengths to minimize thermal management issues. However\, high power densiti es in small core fibers lead to nonlinear effects such as stimulated Brillo uin scattering and damage. Large mode area fibers with cores ~20 m diameter and pump claddings ~200 400 m are a solution\, but fabrication issues limi t the cores of these fibers to ~40 m. One means to obtain the even larger c ores required for power scaling is the photonic crystal fiber. This talk wi ll review fiber lasers\, power scaling and the fabrication and properties o f PCFs. LAST-MODIFIED:20230127T203620Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College P ark\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221207T210000Z DTEND:20221207T220000Z DTSTAMP:20260828T094430Z UID:0pe2rqae1bmoiu4fed78g51rf3@google.com CREATED:20221128T205627Z DESCRIPTION:\n\n4:00-5:00 in PSC 3150\nSpeaker: Carter Hall (UMD)\nTitle: " The recent result on searching for WIMPs with LZ" LAST-MODIFIED:20221128T205627Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP / Particle Astrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221003T190000Z DTEND:20221003T203000Z DTSTAMP:20260828T094430Z UID:1fj6gr47p160ll0cee19dolh71@google.com CREATED:20220926T162024Z DESCRIPTION:Speaker: Akshay Ghalsasi\, U. of Pittsburgh

    T itle: Dark Black Holes in the Mass Gap

    Abstract:
    In the standard picture of stellar evolution\, pair-instability -- the energy loss in stel lar cores due to electron-positron pair production -- is predicted to preve nt the collapse of massive stars into black holes with mass in the range be tween approximately 50 and 130 solar masses -- a range known as the "black hole mass gap". LIGO detection of black hole binary mergers containing one or both black holes with masses in this mass gap thus challenges the standa rd picture\, possibly pointing to an unexpected merger history\, unanticipa ted or poorly understood astrophysical mechanisms\, or new physics. Here\, we entertain the possibility that a "dark sector" exists\, consisting of da rk electrons\, dark protons\, and electromagnetic-like interactions\, but n o nuclear forces. Dark stars would inevitably form given such dark sector c onstituents\, possibly collapsing into black holes with masses within the m ass gap. We study in detail the cooling processes necessary for successful stellar collapse in the dark sector and show that for suitable choices of t he particle masses\, we indeed predict populating the mass gap with dark se ctor black holes. In particular\, we numerically find that the heavier of t he two dark sector massive particles cannot be lighter than\, approximately \, the visible sector proton for the resulting dark sector black holes to h ave masses within the mass gap. We discuss constraints on this scenario and how to test it with future\, larger black hole merger statistics. LAST-MODIFIED:20220926T162024Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121119T160000 DTEND;TZID=America/New_York:20121119T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121119T160000 CREATED:20120904T140915Z DESCRIPTION:SPEAKER: Ken Jacobson\,\nUniversity of North Carolina\, Chapel Hill\nTITLE: "What cell shape oscillations can tell us about cortical act in-microtubule interactions and amoeboid migration" LAST-MODIFIED:20230127T203255Z LOCATION:BIOSCIENCE RESEARCH BLDG 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T180000Z DTEND:20221109T190000Z DTSTAMP:20260828T094430Z UID:3ka8hkjkllm3ur1495slrmfi9i@google.com CREATED:20221101T014139Z DESCRIPTION:Title: Phase diagram of the XXZ spin-1/2 model o n the pyrochlore lattice and its relation to the Programmable Rydberg Atoms Simulator
    Speaker: Nikita Astrakhantsev (University of Zürich)
    Time : Wednesday\, November 9\, 2022 - 1:00pm
    Location: ATL 3332

    The spin-1/2 nearest-neighbor XXZ model on the pyrochlore lattice is an iconic frustrated three-dimensional spin system with a rich phase diagram on the λ axis\, where λ is the XXZ interaction anisotropy.

    In the first par t of the talk\, I will focus on the Heisenberg case λ=1\, in which the mode l is debated to possess a quantum spin-liquid (QSL) ground state. In [Phys. Rev. X 11\, 041021 (2021)]\, we contested this hypothesis with an extensiv e numerical investigation using both exact diagonalization and complementar y variational techniques. Specifically\, we employed an RVB-like many-varia ble Monte Carlo ansatz and convolutional neural network quantum states for (variational) calculations with up to 4×43 and 4×33 spins\, respectively. W e demonstrated that these techniques yield consistent results\, allowing fo r reliable extrapolations to the thermodynamic limit. In addition\, we foun d clear indications of a dimer order with spontaneously broken inversion an d rotational symmetry\, calling the scenario of a featureless QSL into ques tion.

    In the second part of the talk\, I will consider the region λ≪ 1\, corresponding to the Ising model with small exchange interaction. At th e λ=0 Ising case\, the model possesses a thermodynamically-degenerate groun d state\, described by the {\\it two-in\, two-out} spin ice rule. Introduct ion of finite λ≪1 exchange interaction couples the spin ice ground states a nd generates the U(1) QSL with emergent U(1) electrodynamics. In this talk\ , I will demonstrate that this QSL can be embedded into the system of Rydbe rg atoms governed by the Sengupta-Sachdev Hamiltonian. I will show the prel iminary results of the simulation of this embedding within the quantum Mont e Carlo approach. This embedding continues the line of QSL-Rydberg mappings [see\, for instance\, Ruben Verresen et al.\, Phys. Rev. X 11\, 031005] an d allows one to simulate the U(1) QSL on the pyrochlore lattice using the a nalog Rydberg simulator on the system sizes that are otherwise intractable for classical numerical approaches.

    For discussions wi th the speaker\, please sign-up using this link: ht tps://docs.google.com/document/d/18SakWrKgIQBQWoZsFU9Oqv0Ld4JCgB1PhTFxfzWXa 2w/edit?usp=sharing
    LAST-MODIFIED:20221101T014139Z LOCATION:ATL 3332 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Nikita Astrakhantsev TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130531T173000Z DTEND:20130531T210000Z DTSTAMP:20260828T094430Z UID:5ca2d595fpjgvdsu2e13pmvodc@google.com CREATED:20130520T154345Z DESCRIPTION:Save the date! -- Friday\, May 31 -- Lunch at 12:30\, Talks 1:3 0-5:00\n (and please forward this message to all who may be interested )\n\nEveryone is invited to the next Maryland-Goddard Joint Space-Science I nstitute (JSI)\n"mini-symposium" on the afternoon of Friday May 31\, in the Building 8 auditorium\nat NASA's Goddard Space Flight Center. The theme f or this mini-symposium is\n"Multi-Messenger Time Domain Astronomy"\, with t he following speakers and\n(approximate) titles / topics:\n\n Judith Racus in (NASA Goddard) - Gamma-ray Bursts in the Era of Multi-Messenger Time Dom ain Astronomy\n Erik Blaufuss (Maryland) - Results from IceCube\n Imre Ba rtos (Columbia) - Multi-Messenger Astronomy with Gravitational Waves\n Bra d Cenko (Berkeley / NASA Goddard) - Two New Classes of Distant\, Relativist ic Outbursts\n Suvi Gezari (Maryland) - Tidal Disruption Events\n Sean Cu tchin (NRC Postdoc at Naval Research Lab) - Radio Transients at Long Wavele ngths\n\nThere will be some time for discussion after each talk\, as well a s over lunch and\na coffee break. Lunch will be provided at 12:30\, althou gh civil servants may\nbe asked to pay for their lunches (details being wor ked out).\n\nPlease note that NASA-Goddard is a secured facility and you wi ll require a GSFC\nbadge to gain entry to the campus. If you wish to atten d this event and do not have\na Goddard badge\, please contact Stevie Ludlu m (stevie.n.ludlum@nasa.gov) AS SOON AS\nPOSSIBLE with the following inform ation:\n Full name:\n Date of visit:\n Email address:\n Phone numbe r:\n Say whether you are a U.S. citizen\, green card holder\, or foreign national.\n U.S. citizens and permanent residents: Give your driver's lic ense number and state\n (or similar government-issued identification if you don't have a driver's license)\n Foreign nationals: Send a scanned c opy of your passport and U.S. Visa\n\n Note that processing of visitor ba dge requests for foreign nationals can take up\n to 30 days! If some peo ple are unable to get badges in time\, we may set up a\n video link to a room on the U. of Maryland campus. Therefore\, please request a\n badge as soon as possible\, but let us know if it doesn't come through in time.\n \nWe hope to see you all there!\nJohn Baker and Peter Shawhan\, for the JSI mini-symposium committee LAST-MODIFIED:20230127T203128Z LOCATION:Building 8 auditorium at NASA's Goddard Space Flight Center SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI mini-symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130304T164500Z DTEND:20130304T173000Z DTSTAMP:20260828T094430Z UID:ba804r436t3jlt6575f088706s@google.com CREATED:20130116T180242Z LAST-MODIFIED:20230127T203111Z LOCATION:1305F"New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon (for seminar attendees only) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110429T170000Z DTEND:20110429T180000Z DTSTAMP:20260828T094430Z UID:94ve7lo0d4d343q1hctdahulf4@google.com CREATED:20110303T135846Z DESCRIPTION:Title : Materials Seminar: Effect of Rapid Heating on Transient Phase Formation During Self-Propagating Reactions in Metallic Multilayers\ nSpeaker Name: Todd C. Hufnagel\nSpeaker Institution : Johns Hopkins Univer sity\nAbstract : Metastable solid phases can be produced by rapid quenching from the liquid state\, which limits the time available for diffusion and nucleation and growth of competing phases. Similar effects can be expected due to rapid heating\, but most studies of phase transformations involving interdiffusion of chemical species have been performed either isothermally or at moderate heating rates (~1 K/s). In this talk\, we discuss the influe nce of rapid heating (~10^6 K/s) on phase formation during self-propagating reactions in metallic multilayers. Although the reaction front is multilay ers. Finally\, we discuss preliminary results from high-speed x-ray phase c ontrast imaging studies of the propagating reaction fronts\, which show a t ransition in mode from step-wise to uniform front propagation with increasi ng reaction velocity. LAST-MODIFIED:20230127T203049Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100422T161500Z DTEND:20100422T171500Z DTSTAMP:20260828T094430Z UID:0froeskkflvftk8pvt5h8751n8@google.com CREATED:20100217T145542Z DESCRIPTION:Title: Reactive Wetting\nSpeaker: Dan Wheeler\nIREAP\, Universi ty of Maryland and NIST LAST-MODIFIED:20230127T203624Z LOCATION:1207 Energy Research Facsility SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE CATEGORIES:http://schemas.google.com/g/2005#event END:VEVENT BEGIN:VEVENT DTSTART:20221027T180000Z DTEND:20221027T193000Z DTSTAMP:20260828T094430Z UID:7r9sf515ukarhaus8bh8m5vhsk@google.com CREATED:20221021T195113Z DESCRIPTION:Speaker: Rui Zhang\, UMD

    Title: Computing the x-dependence of pion distribution amplitudes on lattice

    Abstract: T he leading-twist pion distribution amplitude (DA) is an important input in hard exclusive processes and a key to understand the bound state structure. Yet it has not received enough constraints from experiments\, its shape an d Mellin moments are still undetermined. In this talk\, I will review vario us calculations of the pion DA and its moments\, and in particular show the recent progress on the calculations of x-dependence of DAs.  \;I will focus on the theoretical efforts we made to eliminate the extra leading cor rections from infrared contributions and to resum the large logarithms at s mall physical scales\, improving the accuracy and convergence\, thus extend ing the reliable range of the calculations. I will also show a combination of large momentum expansion and short-distance OPE to obtain a full-range d istribution\, which is consistent with the lowest Mellin moment of DA.
    < /html-blob> LAST-MODIFIED:20221024T173525Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131021T203000Z DTEND:20131021T213000Z DTSTAMP:20260828T094430Z UID:b6c3d3bod0ofk7lsjqtfku8l58@google.com CREATED:20130916T194509Z DESCRIPTION:Title: Voyager 1 Observations of Large Galactic Cosmic Ray Anis otropies in Interstellar Space\n\nSpeaker Name: Matthew Hill\n\nSpeaker Ins titution : Johns Hopkins University Applied Physics Laboratory\n\nNotes: Co ffee\, Tea & Cookies 4:15-4:30 PM\n\nEdits: Voyager 1 entered a local regio n of the interstellar medium in August of 2012 as evidenced by the observed galactic cosmic ray intensity increases and spectral unfolding\, the disap pearance of particles of solar origin\, and the plasma-wave based detection of high density plasma thought to be consistent only with cold interstella r plasma. This region\, however\, is not pristine and appears to be signifi cantly influenced by the heliosphere\; the magnetic field is still Parker-l ike and there are unprecedentedly large\, varying anisotropies in the galac tic cosmic ray intensities. I will focus on the galactic cosmic ray observa tions we have made with the Low Energy Charged Particle (LECP) experiment b ut will also discuss a physical explanation for the anisotropies being put forth by the LECP team.\n\n\n LAST-MODIFIED:20230127T203329Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220920T150000Z DTEND:20220920T160000Z DTSTAMP:20260828T094430Z UID:0rmtheai9crmf4q520d80t3pfa@google.com CREATED:20220907T154923Z DESCRIPTION:When: September 20th at 11am
    Where: ATL 4402
    Speaker: Dr. Sankar Das Sarma
    Title: The 'sim plest' quantum electronic phases of real matter and the phase transitions a mong them
    Abstract: \;I will discuss in great depth the density-tuned metal-insulator tran sitions in 2D semiconductors\, discussing in the process three important ph ases of quantum matter: metal\, localized insulator\, and Wigner crystal. LAST-MODIFIED:20220913T134046Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100308T173000Z DTEND:20100308T183000Z DTSTAMP:20260828T094430Z UID:v5hqitpgm34thfbbp49ac3oaus@google.com CREATED:20100216T171432Z DESCRIPTION:Title : Quantum critical states and phase transitions in the pr esence of non equilibrium noise\nSpeaker Name: Ehud Altman\nSpeaker Institu tion : Weizmann Institute of Science\nAbstract : Ultracold atomic\, molecul ar or trapped ion systems\, offer unique possibilities to realize interesti ng quantum phases and phase transitions. On the other hand they are easily driven out of equilibrium by external (classical) noise sources. It is natu ral to expect that noise will destroy the subtle correlations underlying qu antum critical behavior\, as does for example thermal noise at equilibrium. Surprisingly we find that the ubiquitous 1/f noise\, does in many cases pr eserve the critical behavior. The emergent states show intriguing interplay of intrinsic quantum-critical and external noise-driven fluctuations. We d emonstrate this general phenomenon with several specific examples in solid state and ultracold atomic systems. Our approach shows that genuine quantum phase transitions can be well defined even for systems driven out of equil ibrium. LAST-MODIFIED:20230127T202948Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110225T180000Z DTEND:20110225T190000Z DTSTAMP:20260828T094430Z UID:na5mecgretav7ndtgi56tq3mk0@google.com CREATED:20110210T210603Z DESCRIPTION:Title : Modulation of Wave-Mode Dynamics in Neon Glow Discharge Plasma\nSpeaker Name: Mark Koepke\nSpeaker Institution : West Virginia Uni versity\nAbstract : Modulation is observed in the dynamics associated with the interaction between a spatiotemporal oscillator (at frequency ω0) and a spatiotemporal driving force (at frequency ωi). The spatiotemporal oscilla tor is a p neon-ionization wave of a neon glow discharge plasma tube. The d riving-force dynamics is either spatiotemporal\, from another p neon-ioniza tion wave\, or temporal\, from chopped neon-resonant laser light. The mode- amplitude normalization of the driving force term in the periodic-pulling e quations is evident during the dynamics modulation\, as validated by experi mental observations.\nSpecifically\, two ionization wave modes in a driven neon glow discharge alternate as the dominant mode as their response to the driving force alternates between spatiotemporal and temporal periodic pull ing. This phenomenon is termed dynamics modulation [1\, 2]. Dynamics modula tion is reproduced experimentally in a neon glow discharge plasma. The syst em is periodically driven near a non dominant mode using a narrow band ring dye laser tuned to a wavelength near the metastable neon transition at 588 .35 nm. A spatially fixed photodiode with a narrow band filter that selecti vely passes the primary neon spectral line at 640 nm is used to acquire the time series of luminosity oscillations. These experimental data are used t o verify the proposed mechanism of dynamics modulation in a periodically dr iven neon glow discharge plasma and explore the resulting implications for spontaneous unidirectional mode transitions that occur with a change in dis charge current. LAST-MODIFIED:20230127T203536Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091105T171500Z DTEND:20091105T181500Z DTSTAMP:20260828T094430Z UID:d8ugbn6ffap9aldtgnnjopk08k@google.com CREATED:20091015T202734Z DESCRIPTION:Title :The Route to Chaos\nSpeaker Name: Jim Yorke\nSpeaker Ins titution : UMD - IPST\n LAST-MODIFIED:20230127T203209Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090910T150000Z DTEND:20090910T160000Z DTSTAMP:20260828T094430Z UID:kv4aj92jsffntaiaaen9g4mom8@google.com CREATED:20090908T141450Z DESCRIPTION:Speaker: Hans Hagen\, TU Kaiserslautern\n \nTitle: Clustering Methods in Geometric Modelling and Scientific Visualization LAST-MODIFIED:20230127T203158Z LOCATION:Room 2460 AVW SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series on Vision TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091001T193000Z DTEND:20091001T203000Z DTSTAMP:20260828T094430Z UID:bjejdlgkooae8inmrhighpl208@google.com CREATED:20090923T181951Z DESCRIPTION:Title : Electroweak Baryogenesis: Theoretical Progress and Expe rimental Tests\nSpeaker Name: Michael Ramsey-Musolf\nSpeaker Institution : University of Wisconsin\, Madison\nAbstract : Abstract: Explaining the orig in of the visible matter of the universe is one of the outstanding problems at the interface of\nparticle and nuclear physics with cosmology. It is po ssible that new physics at the electroweak scale my provide the necessary i ngredients for successful baryogenesis. In this talk\, I discuss recent the oretical developments in electroweak baryogenesis and their implications fo r experimental tests using both "table top" searches for permanent electric dipole moments and collider searches for new particles.\n LAST-MODIFIED:20230127T203530Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland Center for Fundamental Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090225T180000Z DTEND:20090225T193000Z DTSTAMP:20260828T094430Z UID:3lq31mgpbjf2m12r3tj912jp9g@google.com CREATED:20090202T174359Z DESCRIPTION:Title: Hydrodynamics and Gauge/Gravity Duality\nSpeaker: G. Tod d Springer\, University of Minnesota LAST-MODIFIED:20230127T203516Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100526T090000 DTEND;TZID=America/New_York:20100526T180000 RRULE:FREQ=DAILY;WKST=SU;UNTIL=20100528T130000Z DTSTAMP:20260828T094430Z UID:ac6s85q9evkm1t16pvhn9b9nns@google.com CREATED:00010101T000000Z DESCRIPTION:The Maryland Center for Fundamental Physics is hosting and co-s ponsoring a workshop on Advances in Theoretical and Observational Cosmology \, May 26-28\, 2010. It will take place in the John S. Toll Physics Buildi ng.\nThe flood of new observations and theoretical advances continues in th e field of cosmology. This workshop aims to bring together a medium-sized group of researchers leading in these recent results\, including advances i n particle cosmology\, theoretical and observational particle astrophysics\ , and observational cosmology at all wavelengths. LAST-MODIFIED:20230127T203027Z LOCATION:Room 1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:MCFP Workshop on Advances in Theoretical and Observational Cosmolog y TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101006T193000Z DTEND:20101006T203000Z DTSTAMP:20260828T094430Z UID:gn3jfmsv0kvnq6ia2mqdnu4rhs@google.com CREATED:20100930T173629Z DESCRIPTION:Title: Science\, Science Policy\, and the Executive Office\n \n Carl Williams\nChief\, Atomic Physics Division\, NIST and\nCo-Director\, Jo int Quantum Institute\, UMCP\n \nAbstract:\nI will provide an overview of h ow science and science and technology policy are developed and implemented through the Executive Office of the President (EoP) and how science and tec hnology play important roles in many aspects of the Executive Office of the President. The talk will describe the knowledge\, experience\, and insigh t I have gained during my detail to the Office of Science and Technology Po licy (OSTP). I will describe both the policy making arms of OSTP and other offices within the EoP. I will describe how science informs policy and ho w other policy drivers such as economics\, human capital\, and national sec urity play an important role in the final policy decisions. While a number of examples will mentioned and briefly described\, the talk will be focus on my engagements with the Subcommittee for Quantum Information Science (SQ IS) under the Committee on Technology of the National Science and Technolog y Council (NSTC) and on parts of the Comprehensive National Cybersecurity I nitiative (CNCI) which is coordinated through the Information and Communica tions Infrastructure Interagency Policy Council (ICI-IPC) of the National S ecurity Council. The CNCI is a government wide effort aimed at helping to secure the Nation’s digital infrastructure from hacking\, cybercrime\, and state-sponsored intrusions that threaten both the US Government and critica l national infrastructure. Finally\, I will comment on the experience of b eing part of the EoP during the transition from the Bush Administration to the Obama Administration. LAST-MODIFIED:20230127T203840Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081202T210000Z DTEND:20081202T220000Z DTSTAMP:20260828T094430Z UID:8n3epi49vpjtaoe12a192c4aio@google.com CREATED:20080915T192245Z DESCRIPTION:Speaker:Rob Phillips\, California Institute of Technology\nTitl e:"How Viruses Make New Viruses: A Single Molecule View"\n LAST-MODIFIED:20230127T203736Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T150000Z DTEND:20211022T160000Z DTSTAMP:20260828T094430Z UID:65sfbutt81k68otie73vl7e72t@google.com CREATED:20211011T181635Z DESCRIPTION:TITLE:
    Hydrodynamic Quantum Analogs

    SPEAKER: Dr. Pedr o J. Sáenz
    Department of Mathematics
    University of North Carolina at Chapel Hill
     \;
    ABSTRACT
    Millimetric liquid droplets can walk across the surface of a vibrating fluid bath\, self-propelled through a re sonant interaction with their own guiding wave fields. By virtue of the cou pling with their wave fields\, these walking droplets\, or `walkers’\, exte nd the range of classical mechanics to include certain features previously thought to be exclusive to the microscopic\, quantum realm. In this talk\, we will introduce a series of new Hydrodynamic Quantum Analogs involving wa lkers interacting with submerged topographical features at the bottom of th e fluid bath. Special attention will be given to discussing Hydrodynamic Sp in Lattices (HSLs)\, a new analog system that allow us to investigate wave- mediated interactions of effective spin degrees of freedom in inertial and rotating frames. A walker may be trapped by a submerged circular well\, lea ding to clockwise or counterclockwise angular motion centered on the well. When a collection of such wells is arranged in a 1D or 2D lattice geometry\ , a thin fluid layer between wells enables wave-mediated interactions betwe en neighboring droplets. Through experiments and mathematical modeling\, we demonstrate the spontaneous emergence of coherent walker rotation dynamics for different types of lattices. For sufficiently strong pair-coupling\, w ave interactions between neighboring droplets may induce local spin flips l eading to ferromagnetic or antiferromagnetic order. Transitions between the se two forms of magnetic order can be induced through variations in non-equ ilibrium driving\, lattice geometry and Coriolis forces mimicking an extern al magnetic field. Theoretical predictions based on a generalized Kuramoto model derived from first principles rationalize our experimental observatio ns\, thus establishing HSLs as a generic paradigm for active phase oscillat or dynamics.
    BIO
    Pedro is an Assistant Professor and the director of the Physical Mathematics Laboratory (www.p ml.unc.edu) in the Department of Mathematics at UNC. From 2015 to 2019\ , he was an Instructor in Applied Mathematics at MIT. Pedro received his Ph .D. from the University of Edinburgh in 2014\, and was a post-doctoral fell ow at UMD and Imperial College London in 2015. His research blends experime nts\, numerical simulations and theory to address fundamental problems that find motivation in physics and engineering.
     \;
     \;
    Host:  \;Jungho Kim \; \;
    kimjh@um d.edu LAST-MODIFIED:20230127T203807Z LOCATION:DeWalt Seminar Room\, 2164 Glenn L. Martin Hall\, 4298 Campus Dr SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mechanical Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111121T164500Z DTEND:20111121T173000Z DTSTAMP:20260828T094430Z UID:bdud9hpp45535v901ug07aom44@google.com CREATED:20111114T135836Z LAST-MODIFIED:20230127T203613Z LOCATION:Physics "New Toll Room" 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110404T160000Z DTEND:20110404T163000Z DTSTAMP:20260828T094430Z UID:di5ll1lbrlmi1tvm08titculhs@google.com CREATED:20110329T171912Z LAST-MODIFIED:20230127T203517Z LOCATION:Physics 1305 F "Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110303T150000 DTEND;TZID=America/New_York:20110303T160000 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110302T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Imaging Black Hole Horizons: Probing the Nature and Ha bits of Black Holes"\n[Speaker] Avery Broderick\, a candidate of UMD-JSI fa culty position\n[Institution] University of Toronto\n[Abstract] The Event H orizon Telescope\, an Earth-sized array of mm and sub-mm\ntelescopes\, prov ides the novel ability to probe a handful of nearby supermassive black hole s on sub-horizon spatial scales. Already this has provided the best eviden ce to date for the existence of an event horizon and begun to probe the nat ure of the accretion flow onto the black hole at the center of the Milky Wa y. In the near future\, similar observations of the supermassive black hol e at the center of M87 will begin to reveal how ultra-relativistic jets are formed. I will describe how these observations are performed\, what we ha ve learned already\, and how we will use future observations to constrain t he gastrophysics and environment of black holes\, and even the nature of gr avity within their vicinity.\n LAST-MODIFIED:20230127T203416Z LOCATION:1204 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121015T180000Z DTEND:20121015T193000Z DTSTAMP:20260828T094430Z UID:ijrk8eb2t2hq9f869fvagdogik@google.com CREATED:20120919T125134Z DESCRIPTION:Prange Technical Lecture: “Beyond Graphene: Electronic Properti es of van Der Waals Heterostructures”\nSpeaker Name: Andre Geim\nSpeaker In stitution : University of Manchester\nNotes: Flier available at:\nhttp://ww w.physics.umd.edu/cmtc/seminars.html\nAbstract : Following the advent of gr aphene\, several other one-atom or one-molecule thick crystals have been is olated and preliminary studied. They range from semiconducting monolayers t o wide-gap insulators and\, possibly\, metals. This library of two-dimensio nal crystals opens a possibility to construct various 3D structures with on -demand properties\, which do not exist in nature but can be assembled in L ego style by stacking individual atomic planes on top of each other in a de sired sequence. I will overview our recent progress in making such material s and studying their electronic properties. LAST-MODIFIED:20230127T203635Z LOCATION:PHYS 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090501T170000Z DTEND:20090501T180000Z DTSTAMP:20260828T094430Z UID:t0k5uqbhh0arnfth35j1sls0a0@google.com CREATED:20090421T203909Z DESCRIPTION:Title: When Beauty Is Only Skin Deep: Molecular Adsorbate and I norganic Nanowire-Interactions\nSpeaker: Prof. Jonathan E. Spanier\, Drexel University LAST-MODIFIED:20230127T203347Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110502T200000Z DTEND:20110502T213000Z DTSTAMP:20260828T094430Z UID:404qv32qqhplr1jogldoqt5r5o@google.com CREATED:20110425T181522Z DESCRIPTION:Title : Defining Microscopic Environments for Small Cellular Po pulations\nSpeaker Name: Professor Jason Shear\nSpeaker Institution : Unive rsity of Texas\nNotes: Refreshments at 3:45pm LAST-MODIFIED:20230127T203734Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091130T173000Z DTEND:20091130T183000Z DTSTAMP:20260828T094430Z UID:sgg9d8hvggas9f4hhba68p5o4c@google.com CREATED:20091104T163143Z DESCRIPTION:Title : Is smell a quantum phenomenon?\nSpeaker Name: Luca Turi n\nSpeaker Institution : Biological Engineering\, MIT\nAbstract : Our sense of smell is a extraordinarily good at molecular recognition: we can identi fy tens of thousands of odorants unerringly over a wide concentration range . The mechanism by which this happens do so is still hotly debated. One vie w is that molecular shape governs smell\, but this notion has turned out to have very little predictive power. Some years ago I revived a discredited theory that posits instead that the nose is a vibrational spectroscope\, an d proposed a possible underlying mechanism\, inelastic electron tunneling. In my talk I will review the history and salient facts of this problem and describe some recent experiments that go some way towards settling the ques tion. LAST-MODIFIED:20230127T203816Z LOCATION:PHYS1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091204T210000Z DTEND:20091205T011500Z DTSTAMP:20260828T094430Z UID:a9u0sm2e5gbu51bgsq0od1a9i8@google.com CREATED:20091202T204626Z DESCRIPTION:Speaker - Presentation\nKristina T. Gaff - Dynamics of th e Vortex Lattice in Superfluid Helium\nWilliam McConville - AGN studies w ith the Fermi Gamma-Ray Space Telescope\nKate Despain - Kolmogorov Energy Relations in Turbulence\nRodrigo Herrera Camus - Low Surface Brightness Galaxies: Nature or Nurture?\nWilliam Stem - Spintronics: the Future of C omputers\nHannah Krug - Neutral Gas Outflows and Inflows in Infrared-Fain t\nSeyfert Galaxies\nJoseph Mitchell - Discovering the Higgs Boson at the Large Hadron Collider\nVarun Vaidya - Towards a Continuous Wave Atom Las er\nBrian Christy - Searching for Relativistic Magnetic Monopoles with Ic eCube\nMike Koss - Supermassive Black Holes Feeding in a Galaxy Near You LAST-MODIFIED:20230127T203600Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Spotlight on Graduate Research Competition - Day 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090205T190000Z DTEND:20090205T203000Z DTSTAMP:20260828T094430Z UID:mda1n5pf93116vdf0hojc7hok4@google.com CREATED:20090202T173956Z DESCRIPTION:Title: Oxide Nanoelectronics On Demand\nSpeaker: Professor Jere my Levy\, University of Pittsburgh\n LAST-MODIFIED:20230127T203336Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091012T200000Z DTEND:20091012T213000Z DTSTAMP:20260828T094430Z UID:ak761rbidmh9tr99bkmqcjsu60@google.com CREATED:20091005T132022Z DESCRIPTION:Title : Conformational Equilibrium in the Yeast Telomerase RNA Pseudoknot Domain.\nSpeaker Name: Carla Theimer\nSpeaker Institution : Univ ersity of Albany\, SUNY\nNotes: Refreshments are served at 3:45pm. LAST-MODIFIED:20230127T203538Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131119T181500Z DTEND:20131119T193000Z DTSTAMP:20260828T094430Z UID:s36avcb4giqiua78gvf2lain9o@google.com CREATED:20131111T145645Z DESCRIPTION:Title : Effects of Surface Interactions on the Single-Particle Dynamics of Water Under Strong Confinement.\n\nSpeaker Name: Dr. Chris Bert rand\n\nSpeaker Institution : NIST\n LAST-MODIFIED:20230127T203449Z LOCATION:Room 1116\, IPST Building\, Bldg. 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110411T140000 DTEND;TZID=America/New_York:20110411T150000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110411T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Theoretical problems in Higgs boson production at the Tevatron and the LHC"\n[Speaker] Frank Petriello\n[Institution] Argonne and Northwestern University\n[Abstract] The search for the Higgs boson is bein g undertaken at both the Tevatron and the LHC. The discovery of the Higgs and measurement of its properties will help reveal the new Standard Model o f particle physics at the TeV scale. However\, several recent studies have criticized the theoretical framework upon which the Higgs search is based\ , and our ability to carry out this program has been questioned. In this ta lk we will review the theoretical issues involved\, discuss the relevance o f the various criticisms and outline what further calculations and measurem ents are needed to alleviate the remaining worries.\n\n LAST-MODIFIED:20230127T203648Z LOCATION:Johns Hopkins University SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar Joint with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121015T163000Z DTEND:20121015T173000Z DTSTAMP:20260828T094430Z UID:1cltcc4pfh8lu0mlkkvnletdjk@google.com CREATED:20120927T140005Z DESCRIPTION:Title: Hybrid electro-optical quantum nanosystems \nSpeaker: J onathan Finley\, Walter Schottky Institut -Centre for Nanotechnology and Na nomaterials \nTU-München\, Am Coulombwall 4a\, 85748 Garching\, Germany \nA bstract: In this talk I will give an overview of several research themes p ursued in my group on hybrid electro-optical quantum nanosystems. Specific examples include the electro-optical preparation\, manipulation and readout of the spin of single electrons and holes in artificial atoms and molecule s and the investigation of coupling to the solid-state environment and the exploration of tailored dielectric / metallic photonic nanomaterials that f acilitate control of the light-matter interaction at the single emitter – s ingle photon limit. I will discuss how\, by coupling several degrees of fre edom at the quantum limit (here\, spin -photon -electron…) \nnew avenues of exploration can be opened up across many fields in solid-state quantum \np hysics and applied nanoscience. \n\n \n LAST-MODIFIED:20230127T203624Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQIv Seminar - Jonathan Finley TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100211T203000Z DTEND:20100211T213000Z DTSTAMP:20260828T094430Z UID:e4f1meo9soesu2604niuvfgmvs@google.com CREATED:20100208T132252Z DESCRIPTION:Speaker : Steve Pollock\, Physics Department\, University of Co lorado\, Boulder.\n\nTitle: A research-based approach to transforming an up per-division\nelectricity and magnetism course\n LAST-MODIFIED:20230127T203715Z LOCATION:PHYS 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PERG seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100416T160000Z DTEND:20100416T170000Z DTSTAMP:20260828T094430Z UID:bvu640ngd1qh6836n27lq66kgs@google.com CREATED:20100414T181332Z DESCRIPTION:Title: Women in Science in India" \npresented by Dr. Sumitra Mo hanty Chakrabarti\, \na physicist at the University of Delhi\, will give a talk entitled "Women and Science: University of Delhi LAST-MODIFIED:20230127T203126Z LOCATION:American Center for Physics - Conference room C 1 Physics Ellipse College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Brown Bag Lunch -Women in Science in India TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230119T160000Z DTEND:20230119T170000Z DTSTAMP:20260828T094430Z UID:4evoe0vuk4bia4deu3tci0b9cl@google.com CREATED:20230104T022326Z DESCRIPTION:Title:  Quantum majority vote
    Speaker:  Maris Ozols (Univers ity of Amsterdam)
    Time:  Thursday\, January 19\, 2023 - 11:00am
    Locat ion:  3100A and Virtual Via Zoom: https://umd.zoom.us/j/91342511944?pwd=L2Zlb ktpLzhkYU5PNE5IeE1PYkJTQT09

    Majority vote is a basic method for amplifying correct outcomes that is widely used in computer science and bey ond. While it can amplify the correctness of a quantum device with classica l output\, the analogous procedure for quantum output is not known. We intr oduce quantum majority vote as the following task: given a product state ∣ψ _1〉⊗⋯⊗∣ψ_n〉 where each qubit ∣ψ_i〉 is in one of two orthogonal states ∣ψ〉 o r ∣ψ^⊥〉\, output the majority state. We show that an optimal algorithm for this problem achieves worst-case fidelity of 1/2 + Θ(1/n). Under the promis e that at least 2/3 of the input qubits are in the majority state\, the fid elity increases to 1 − Θ(1/n) and approaches 1 as n increases.

    We al so consider the more general problem of computing any symmetric and equivar iant Boolean function f: {0\,1}^n→{0\,1} in an unknown quantum basis\, and show that a generalization of our quantum majority vote algorithm is optima l for this task. The optimal parameters for the generalized algorithm and i ts worst-case fidelity can be determined by a simple linear program of size O(n). The time complexity of the algorithm is O(n^4 log n) where n is the number of input qubits.

    This is joint work with Harry Buhrman\, Noah Linden\, Laura Mančinska\, and Ashley Montanaro.
    https://arxiv.org/abs/2211.11729 LAST-MODIFIED:20230104T022326Z LOCATION:3100A and Virtual Via Zoom: https://umd.zoom.us/j/91342511944?pwd= L2ZlbktpLzhkYU5PNE5IeE1PYkJTQT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Maris Ozols TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110131T150000 DTEND;TZID=America/New_York:20110131T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110131T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Dynamical gaugino mediation in 4D"\n[Speaker] Andrey K atz\n[Institution] University of Maryland\n[Abstract] I will discuss renorm alizable supersymmetric 4D theories which lead to gaugino mediation. Even t hough these models are strongly coupled\, one can show the suppression of s calar masses via Seiberg duality. I will demonstrate that the models under consideration have a parameter\, which continuously interpolates between su ppressed soft scalar masses and conventional gauge-mediated contributions. The main physical effect we utilize is the general relation between massive deformation in one frame and higgsing in the Seiberg-dual frame. I will al so briefly discuss some generalizations of these scenario. These generaliza tions have a good potential to address the mu-problem of the MSSM and the S M flavor puzzle\, yilding non-trivial predictions for the superpartners' sp ectrum. LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110425T160000Z DTEND:20110425T163000Z DTSTAMP:20260828T094430Z UID:rav5cq10lqrfun22isjk7pr94g@google.com CLASS:PUBLIC CREATED:20110303T190424Z LAST-MODIFIED:20230127T203629Z LOCATION:Physics 1305F "Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081014T150000Z DTEND:20081014T160000Z DTSTAMP:20260828T094430Z UID:667d8dmbqfm4ccb02r14gejrcs@google.com CREATED:20081009T130222Z DESCRIPTION:Speaker: Professor Alexander Drohat\, University of Maryland\nT itle: Repairing G.T. Mismatches at CpG Sites in DNA - Insight from Structur e and Kinetics. LAST-MODIFIED:20230127T203715Z LOCATION:Marker Seminar Room (Chem 0112) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYSICAL CHEMISTRY & CHEMICAL PHYSICS TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221212T160000Z DTEND:20221212T170000Z DTSTAMP:20260828T094430Z UID:3s4395v0fvdau1lfoidai09a7l@google.com CREATED:20221122T195349Z DESCRIPTION:\nSpeaker: Chris Wilson\, University of Waterloo\n\nTitle: Anal og Quantum Simulation of Topological Lattice Models with a Parametric Cavit y\n\nAbstract: There has been a growing interest in realizing quantum simul ators for physical systems where perturbative methods are ineffective. The scalability and flexibility of circuit quantum electrodynamics (cQED) make it a promising platform to implement various types of simulators\, includin g lattice models of strongly-coupled field theories. Here\, we use a multim ode superconducting parametric cavity as a hardware-efficient analog quantu m simulator\, realizing a lattice in synthetic dimensions with complex hopp ing interactions. The coupling graph\, i.e.\, the realized model\, can be p rogrammed in situ. The realization of complex-valued hopping interactions f urther allows us to simulate\, for instance\, gauge potentials and topologi cal models. As a demonstration\, we simulate small realizations of paradigm atic topological models including the bosonic Creutz ladder and SSH model. We characterize the lattice with scattering measurements\, reconstructing t he experimental Hamiltonian and observing important precursors of topologic al features including nonreciprical transport and Ahranov-Bohm caging. This platform can be easily extended to larger lattices and different models in volving other interactions. LAST-MODIFIED:20221122T195601Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Chris Wilson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221018T160000Z DTEND:20221018T170000Z DTSTAMP:20260828T094430Z UID:1lmfsb5rrbtadnmni0seavg6ka@google.com CREATED:20220928T161517Z DESCRIPTION:PhD Defense: Timothy Diethrich\, UMCP

    Title:& nbsp\;Tuning Crystallographic and Magnetic Symmetry in Lithium Transi tion Metal Phosphates and Thiophosphates

     LAST-MODIFIED:20220928T162103Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120216T190000Z DTEND:20120216T203000Z DTSTAMP:20260828T094430Z UID:hl74jrmsdld5o7ouqtiumtk3ps@google.com CREATED:20120209T205715Z DESCRIPTION:Speaker: Xiaoshan Xu\, Oak Ridge National Laboratory\nTitle: N ovel functional oxides and interfaces to the organics\nAbstract: In the qu est for new types of information processing and storage\, complex oxides st and out as one of the most promising material classes. In particular\, mult iferroic and magnetoelectric oxides which simultaneously exhibit more than one ferroic order have many advantages over existing materials. In this pre sentation\, I will talk about the hexagonal Lu-Fe-O compound as a novel mul tiferroic family. The hexagonal LuFeO3 we studied is a novel multiferroic m aterial stabilized in thin-film form. We demonstrated the long-expected fer roelectricity using piezoresponse force microscopy. More interestingly\, th e hexagonal LuFeO3 exhibits complex magnetic ordering including weak ferrom agnetism above room temperature and spin-canting at 130 K. The combination the ferroelectricity and weak ferromagnetism offers great application poten tial for this novel multiferroic material.\n\nThe electronic properties of inorganic/semiconducting polymer (SCP) interfaces dictate the properties of organic electronics and organic spintronics such as organic light-emitting diodes (OLED)\, organic photovoltaics (OPV)\, organic photo diodes\, and o rganic spin valves. Specifically\, the electronic structure at the metal/SC P interface determines the charge collection of OPVs\, the charge injection of OLEDs\, and the electronic spin injection of organic spin valves. Unfor tunately\, there are few degrees of freedom in changing the interfacial ele ctronic structure by varying the working function of the metal and/or the H OMO and LUMO of organic material. On the other hand\, by introducing a thin ferroelectric layer\, we were able to tune the energy alignment between th e metals and organics by controlling the interfacial dipole which is determ ined by the polarization of the ferroelectric layer. This tunability offers a new route of optimizing the functionality and energy efficiency of the o rganic electronics and spintronics.\n\nHost: Min Ouyang LAST-MODIFIED:20230127T203619Z LOCATION:Room 1201 Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110131T173000Z DTEND:20110131T183000Z DTSTAMP:20260828T094430Z UID:0qu4bsv2g0l0p1615vl0srkehc@google.com CREATED:20110126T174957Z DESCRIPTION:Title: Gap inhomogeneity in high-temperature superconductors\nS peaker: Joseph Spalek\, University of Silesia\, Katowice Poland LAST-MODIFIED:20230127T203001Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110228T210000Z DTEND:20110228T220000Z DTSTAMP:20260828T094430Z UID:elrh7or4jdmaggq9c4j77kiq5c@google.com CREATED:20110217T145408Z DESCRIPTION:Title : Protein Sliding and Jumping Along DNA\nSpeaker Name: Pr ofessor Koby Levy\nSpeaker Institution : Weizmann Institute\nNotes: Refresh ments at 3:45pm\n LAST-MODIFIED:20230127T203529Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST/BIOPHYSICS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120126T190000Z DTEND:20120126T203000Z DTSTAMP:20260828T094430Z UID:akcueh2gqhvh7br01eps2bl428@google.com CREATED:20120104T155605Z DESCRIPTION:Speaker: Sergio O. Valenzuela\, \n ICREA & Catalan Inst. of Nanotechnology\, Barcelona\, Spain\nTitle: Spin Currents & spin dynamics in metallic nanostructures\nAbstract: Spintronics aims to replace charge with spin as the main computational element in devices. Much effort is being devoted to understand how the electron spin is transferred through interfaces and to identify fundamental processes that modify the spin pola rization or that can be used for spin manipulation. Lateral structures are a unique tool to study these phenomena because of the ease to fabricate the m in multi-terminal configurations. In the first part of the talk\, this wi ll be illustrated with some of our experimental results in thin-film nonloc al spin devices\, where the output voltage is exclusively determined by the spin degree of freedom and provides valuable information on spin-flip scat tering mechanisms\, spin-polarized tunneling\, and spin Hall effects. In th e second part of the talk\, new aspects of thermoelectricity associated to spin effects will be addressed. Such effects are expected to be beneficial for energy conversion applications and for the search of novel pathways tow ards transporting spin information using magnons (spin-wave quanta). First\ , a spin ratchet at the single-electron level\, which produces spin current s with no net bias or charge transport\, will be described. Then a thermopi le will be introduced that allows us to discriminate the magnon drag from o ther thermoelectric effects and to gather valuable knowledge about electron -magnon interactions.\n\n\n\n LAST-MODIFIED:20230127T203125Z LOCATION:Rm. 1201\, Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090422T193000Z DTEND:20090422T203000Z DTSTAMP:20260828T094430Z UID:j11hokoppvq380qp7a4oqpsvjs@google.com CREATED:20090325T190819Z DESCRIPTION:Title: Circuits\, Sensors\, and Surprises from Organic Semicond uctor Devices\nSpeaker: Dr. Howard Katz\, Johns Hopkins University LAST-MODIFIED:20230127T203329Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130923T160000Z DTEND:20130923T164500Z DTSTAMP:20260828T094430Z UID:l3bprur2ctsoff0hgo9obvn5v0@google.com CLASS:PUBLIC CREATED:20130911T135423Z DESCRIPTION:JQI Luncheon LAST-MODIFIED:20230127T203725Z LOCATION:CSS Room 2115 - JQI Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100322T200000Z DTEND:20100322T213000Z DTSTAMP:20260828T094430Z UID:tcmcveasa478d0iecesmpsupuc@google.com CREATED:20100308T144139Z DESCRIPTION:Title : Single Particle Biophysics: Nanopores\, Liposomes\, and Mitochondrial Diseases\nSpeaker Name: Professor Joseph Reiner\nSpeaker Ins titution : National Institute of Standards and Techonology\nNotes: Refreshm ents at 3:45pm LAST-MODIFIED:20230127T203333Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100405T163000Z DTEND:20100405T173000Z DTSTAMP:20260828T094430Z UID:vbp2m6uf8u8kcbv1c034b34gi8@google.com CREATED:20100119T163650Z DESCRIPTION:Title : A coherent beam splitter for electronic spin states\nSp eaker Name: Jason Petta\nSpeaker Institution : Princeton\nAbstract : Energy level crossings\, where two quantum states cross in energy as a function o f an external parameter\, are ubiquitous in quantum mechanics. We demonstra te coherent control of electronic spin states in a double quantum dot by sw eeping an initially prepared spin singlet state through a singlet-triplet a nti-crossing in the energy level spectrum.1 The anti-crossing serves as a b eam splitter for the incoming spin singlet state. Consecutive crossings thr ough the beam splitter\, when performed within the spin dephasing time\, re sult in controllable coherent quantum oscillations between the singlet stat e and triplet state. The observed quantum interference patterns are in good agreement with a theoretical model of consecutive Landau-Zener tunneling e vents.2 This all-electrical method for quantum control relies on electron-n uclear spin coupling and drives single electron spin rotations on nanosecon d timescales without electron spin resonance fields\, which are difficult t o !\n\nlocalize on the nanometer scale. LAST-MODIFIED:20230127T203629Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131025T170000Z DTEND:20131025T180000Z DTSTAMP:20260828T094430Z UID:72l4ic4g9ms8h62ubqdnp6p5b0@google.com CREATED:20131022T131006Z DESCRIPTION:Title : GaN Power Transistors with Integrated Thermal Managemen t and a Look Forward to GaN Vertical Power Devices\n\nSpeaker Name: C.R. Ed dy\, Jr.\n\nSpeaker Institution : U.S. Naval Research Laboratory\n\nNotes: This is a Materials Science and Engineering seminar.\n\nAbstract : GaN powe r transistors offer great promise for applications in compact\, high effici ency power systems simply based upon the properties of III-N materials. The se properties result in a power figure-of-merit that is almost 700X greater than silicon and 160X that of 4H silicon carbide. Despite this promise the re remain several challenges to reliable GaN power switches including reduc ing the thermal limit to ultimate performance\, reducing gate and forward b locking leakage and reducing the on-resistance of the device. This seminar will highlight recent materials development efforts to address GaN power sw itch limitations through the realization of an enhancement-mode (e-mode) la teral HEMT with integrated nanocrystalline diamond coatings for thermal man agement. In addition\, an initial look at some key materials challenges to the next generation of GaN power devices involving vertical blocking archit ectures is offered.\n LAST-MODIFIED:20230127T203145Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131007T200000Z DTEND:20131007T213000Z DTSTAMP:20260828T094430Z UID:f9obq9d3jmjd7ohhat5s62t4b8@google.com CREATED:20130930T145735Z DESCRIPTION:Title : Inferring and Programming the Structure and Dynamics of Macromolecular Machines.\nSpeaker Name: Mark Bathe\nSpeaker Institution : MIT\nNotes: *Refreshments at 3:45pm\n LAST-MODIFIED:20230127T203150Z LOCATION:Room 0112\, Chemistry Building (Marker Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120420T170000Z DTEND:20120420T180000Z DTSTAMP:20260828T094430Z UID:nsm9tporn42vt31mslsrf94q8s@google.com CREATED:20120410T153547Z DESCRIPTION:Title : An Examination of Nanostructures in 19th Century Daguer reotype Photographs\nSpeaker Name: Edward P. Vicenzi\nSpeaker Institution : Museum Conservation Institute\, Smithsonian Institution/Surface and Microa nalysis Science Division\, NIST\nAbstract : In 1839\, the Daguerreotype pho tographic process was first presented to the scientific community in France . The technology spread rapidly and was widely used around the globe until the late 1850s. The formation of the so-called "mirrors with memories" can be generalized in three steps: 1) exposing silver-plated copper to an iodin e vapor\, 2) further exposing the sensitized plate to visible light within a camera\, and 3) development of an image after the plate is treated with h eated mercury vapor. The surfaces of these precious images have been the su bject of a few microscopy-based studies over the years. However\, a detaile d examination of the morphology and chemistry at the deep sub-micrometer le vel has not been undertaken. High resolution images of the Daguerreotype im age-forming layer using the FIB-SEM has been employed to visualize the thre e-dimensional nature of the Ag-Hg nanofilm and any nanoparticles responsibl e for scattering light on the surface of Daguerreotypes. These cross sectio ns additionally expose the metallographic microstructure of the Ag substrat e\, especially the layer immediately beneath the image nanofilm for examina tion and correlation with surface nanostructures. LAST-MODIFIED:20230127T203528Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130313T150000Z DTEND:20130313T160000Z DTSTAMP:20260828T094430Z UID:3deegq14pl5v92l5ckj993sht4@google.com CREATED:20130308T144426Z DESCRIPTION:Title: Light Trapping and Solar Energy Harvesting in Thin Film Photonic Crystals\n\nSpeaker: Sajeev John\nDept. of Physics\nUniversity of Toronto\n\nAbstract: Photonic crystals are widely known for their light-tra pping capabilities.\nThis is often associated with the occurrence of a phot onic band gap or\nother suppression in the electromagnetic density of state s [1-3]. This\nenables guiding of light on an optical micro-chip and unprec edented forms\nof strong-coupling between light and matter. In the past\, p ractical\napplications of these effects have focussed on *information techn ology*.\nMore recently\, an important opportunity has emerged in the area o f *energy\ntechnology*. This arises from light-trapping in the higher bands of a\nphotonic crystal\, where the electromagnetic density of states is en hanced\nrather than suppressed. This enables unprecedented strong absorptio n of\nsunlight in a material with weak intrinsic absorption [4].\n\nWe desc ribe designs of 3D *photonic crystal silicon-based solar cells *that\nenhan ce the overall absorption of sunlight using architectures consisting\nof *j ust 1 micron *(equivalent bulk thickness) *of silicon*. These crystals\ntra p light through a parallel-to-interface negative refraction (PIR) effect\na nd other optical resonances that occur over a broad angular and frequency\n range [4]. These 3D photonic crystals exhibit an enhanced electromagnetic\n density of states\, consisting of slow group velocity modes\, in which the\ nflow of energy is transverse to the depth of a thin film of material. In\n the case of a modulated nanowire photonic crystal solar cell\, it is\npossi ble to absorb roughly 75% of all available sunlight in the wavelength\nrang e of 400-1100 nm\, using one micron of silicon [5\, 6]. In the case of\ncon ical nano-pore silicon photonic crystal\, roughly 85% of all available\nsun light is absorbed [7]. The power conversion efficiencies of these\none-micr on photonic crystals rival those of present-day solar cells using\nup to 30 0 microns of silicon. Similar considerations apply to other\nmaterials such as GaAs where it is possible to absorb about 95% of sunlight\nabove the ba ndgap with only 100 nm of material. These photonic crystals\noffer addition al opportunities for solar spectral reshaping to rival and\npossibly surpas s the famous Shockley-Queisser power conversion efficiency\nlimit of 33%. LAST-MODIFIED:20230127T203330Z LOCATION:Energy Research Facility\, Rm. 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091111T180000Z DTEND:20091111T193000Z DTSTAMP:20260828T094430Z UID:jaboj0rba6ki4rltbuvp63tm6s@google.com CLASS:PUBLIC CREATED:20091023T193015Z DESCRIPTION:Title: Transport Coefficients and Universality in High T Hologr aphy\n\nSpeaker Name: Aleksey Cherman\nInstitution: University of Maryland\ n\nAbstract: The quark-gluon plasma produced at RHIC appears to behave as a strongly-coupled fluid. This has focused much recent attention on strongly -coupled fluids\, which are theoretically intractable using standard field- theoretic methods. \nThe gauge/gravity duality is the only known technique that gives theoretical access to the properties of strongly-coupled fluids described by gauge theories that bear some resemblance to QCD. While no d ual to QCD is known\, it may still be useful to look at fluids with gravity duals to obtain some otherwise unavailable intuition \nabout what can happ en to fluids at strong coupling. To this end\, a number of transport coef ficients in a broad class of strongly-coupled fluids described by theories with gravity duals are investigated. These fluids stay strongly coupled ev en at high temperatures\, in contrast to what happens to the QCD plasma. It turns out that transport coefficients exhibit interesting universal behavi ors at high T. \nFurthermore\, there is a bound on the speed of sound v_s in these theories\, with v_s^2 always approaching 1/3 the speed of light fr om below at high T. These results are compared with what one finds in the ories that are weakly coupled at high T.\n LAST-MODIFIED:20230127T203342Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220928T150000Z DTEND:20220928T160000Z DTSTAMP:20260828T094430Z UID:7f1rv5dk7vrns4u165o7h6app3@google.com CREATED:20220804T154102Z DESCRIPTION:Speaker: Dr. Susanna Widicus Weaver\, University of Wisconsin-Madison

    Title: The Role of UV Photolysis and Thermal Proce ssing in Interstellar Ice Chemistry


    Abstract: It has been shown through both laboratory and observationa l studies that direct and cosmic-ray induced UV photodissociation drives a complex network of chemistry in interstellar ices. Astrochemical models hav e demonstrated that gradual heating of these UV-processed ices during star formation can lead to a wide variety of complex organic molecules. Addition al modeling and observational studies have shown that these molecules are l ikely incorporated into protoplanetary disks and participate in the chemist ry of planet formation. These processes could therefore serve as molecular starting points for prebiotic chemistry in the universe. Our observations o f the chemistry of star-forming regions have shown that there is wide varia tion in the chemical compositions of hot cores\, and that methanol photodis sociation on icy grains may be the key process feeding the formation of lar ger prebiotic molecules. To test possible chemical routes in interstellar i ces\, we have built a novel laboratory experiment that couples the traditio nal tools of ice studies – FTIR spectroscopy and mass spectrometry – with t he structure specificity of rotational spectroscopy. Such measurements can provide the “ground truth” to guide observations of star- and planet-formin g zones. This novel experimental approach has been benchmarked with pure ic e studies of water and methanol\, and initial photoprocessing results for a pure methanol ice have been obtained. A complex network of organic chemist ry was observed and offers fascinating hints at the processes driving inter stellar prebiotic chemistry. Our ongoing studies are designed to investigat e mixed ices of varying ratios of water and methanol to better simulate int erstellar chemistry. In this talk I will present both the observational and laboratory studies and discuss these results in the context of prebiotic a strochemistry. \; \; LAST-MODIFIED:20220915T180331Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091208T194500Z DTEND:20091208T204500Z DTSTAMP:20260828T094430Z UID:l7mog033hbi89nesmqas5sgm5k@google.com CREATED:20091202T164604Z DESCRIPTION:[Title] "Dark Matter and Pulsar Interpretations of the WMAP Haz e"\n[Speaker] Pat Harding\n[Institution] University of Maryland LAST-MODIFIED:20230127T203406Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particles Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111212T164500Z DTEND:20111212T173000Z DTSTAMP:20260828T094430Z UID:leekuc9qg5a8nomc951m8929po@google.com CREATED:20111129T150532Z LAST-MODIFIED:20230127T203521Z LOCATION:Physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090625T140000Z DTEND:20090625T150000Z DTSTAMP:20260828T094430Z UID:nplunvc1ofmp367fve7auu9720@google.com CREATED:20090624T180632Z DESCRIPTION:Speaker: Eung Jin Chun\, Korea Inst. for Advanced Study\nTitle: LFV and Leptogenesis in Higgs Exempt No-Scale Supersymmetry LAST-MODIFIED:20230127T203246Z LOCATION:Physics Building\, Room 4102 SEQUENCE:6 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120213T164500Z DTEND:20120213T173000Z DTSTAMP:20260828T094430Z UID:red83imes2legnirv4g41gi078@google.com CREATED:20120209T184214Z LAST-MODIFIED:20230127T203600Z LOCATION:1305F " New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI - Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120310T003000Z DTEND:20120310T013000Z DTSTAMP:20260828T094430Z UID:hqrf50ucsq1768ht56l834dg1c@google.com CREATED:20110818T203822Z DESCRIPTION:Delve into demonstrations of color\, color mixing and color vis ion. See non-spectral colors ---colors that are not in the rainbow! Observe the Land Effect and be amazed by “greener than green!”\n\nDoors open 7:00P M\nFor directions and further information call 301-405-6045 or visit www.ph ysics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203758Z LOCATION:Physics Lecture Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Color TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110404T150000 DTEND;TZID=America/New_York:20110404T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110404T150000 CREATED:00010101T000000Z DESCRIPTION:Title: An effective Z' [Note the "prime" after the Z: it sh ould be Z'\, not Z!]\nSpeaker: David Tucker-Smith\nInstitution: Williams Co llege\nAbstract: I discuss a framework for extending the Standard Model (SM ) to incorporate a Z' gauge boson in the effective theory. The Z' can coupl e exclusively to left- or right-handed quarks or leptons and can have flavo r-violating couplings\, without disturbing some of the nicest features of t he SM. I will explore the extent to which this framework can be used to ad dress various Tevatron anomalies\, and then will briefly discuss other dist inctive aspects of its collider phenomenology. \n\n LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100326T190000Z DTEND:20100326T200000Z DTSTAMP:20260828T094430Z UID:ut3jqu4fh3rq77t15jbcg2rl40@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100322T141545Z DESCRIPTION:Title : Principles of self assembly\, from hydrophobic collapse to virus capsid assembly\nSpeaker Name: Professor David Chandler\,\nSpeake r Institution : University of California\, Berkeley\nAbstract : "Hydrophobi c forces -- the forces that cause oil and water to de-mix\n-- often play si gnificant roles in both the thermodynamics and the\nkinetics of nano-scale self-assembly. This lecture describes\nprinciples that underlie these force s\, and competition between these\nforces and geometrical constraints. The competition leads to specific\nassembled structures. Sometimes\, the compet ition results in kinetics\ntrumping thermodynamics." LAST-MODIFIED:20230127T203730Z LOCATION:Room 0112\, Marker Seminar Room\, Chemistry Building (091) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121108T210000Z DTEND:20121108T223000Z DTSTAMP:20260828T094430Z UID:mbcllk4e2o9qh0bcd17u56nnac@google.com CLASS:PUBLIC CREATED:20120822T212050Z DESCRIPTION:Title: " Covering the bases"\nSpeaker: Marc Kamionkowski\nInsti tution: Johns Hopkins University\nAbstract: One of the principal aims of co smology today is to seek subtle correlations in primordial perturbations\, beyond the standard two-point correlation that has been mapped precisely al ready\, that may hint at new physics beyond that in the simplest single-fie ld slow-roll models. I will describe in this talk a new class of such corr elations and how they may be sought with galaxy surveys and in the CMB. I w ill then turn my attention to a new formalism\, total-angular-momentum (TAM ) waves\, that my collaborators and I have recently developed. In most of the literature\, cosmological perturbations are decomposed into Fourier mod es\, or plane waves. However\, for calculations that aim to produce predic tions for angular correlations on a spherical sky\, a decomposition into TA M waves provides a far more direct and intuitive route from theory to obser vations. I will describe the formalism and illustrate its utility with a f ew sample calculations.\n LAST-MODIFIED:20230127T203454Z LOCATION:1204 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081015T200000Z DTEND:20081015T213000Z DTSTAMP:20260828T094430Z UID:qt1dsa7fmk7c87o230sva9ep9o@google.com CREATED:20080912T182320Z DESCRIPTION:Speaker:Chung Wen Kao\, Chung Yuan Christian Univ.\, Chung Li\, Taiwan\nWeb site:http://www.cycu.edu.tw/cycu_e/cycuwebsite/index.htm\nTitl e: "Two is Too Many: Personal View of Two-Photon Physics"\nMore Information : http://www-spires.slac.stanford.edu/cgi-bin/spiface/find/hep/www?FORMAT=W WW&\;rawcmd=find+a+kao\,chung wen+\nContact Loretta Robinette\n(See http ://www.physics.umd.edu/tqhn) LAST-MODIFIED:20230127T203543Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN/ENP SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220926T203000Z DTEND:20220926T213000Z DTSTAMP:20260828T094430Z UID:25b01gc2o5o1qdb3dtifov6j9p@google.com CREATED:20220903T184757Z DESCRIPTION:Title: \;Indirect dark matter search with a very-high-energy gamma-ray observatory

    Speaker: Donggeun Tak\, DE SY\, Germany

    Abstract: In the current cosmological paradigm\, Dark M atter (DM) constitutes a large portion (about 27 %) of the mass and energy content of the Universe. One DM candidate\, the Weakly Interacting Massive Particle (WIMP)\, can potentially have a mass in the range from 50 GeV to g reater than 10 TeV. Self-annihilation and/or decay of WIMPs may produce var ious secondary particles\, producing very-high-energy gamma rays (VHE\; abo ve 100 GeV). The signature of the WIMP signal has been searched with state- of-art observatories\, but it has not been successful. This lack of success proposes a new parameter range\, ultra-heavy DM (UHDM). In this talk\, I w ill summarize the status of the WIMP search\, focusing on the Very Energeti c Radiation Imaging Telescope Array System (VERITAS) result\, and explore the feasibility of de tecting the annihilation signature for UHDM with current and future VHE gam ma-ray observatories. Finally\, I will present the result of the UHDM searc h with VERITAS.


    Recording of th e talk

    Notes: Join the meeting at 4:15 for meet and greet
    Vis it https://bit.ly/2PmJoT6 to be added to the seminar mailing list.     LAST-MODIFIED:20221024T230158Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121022T160000 DTEND;TZID=America/New_York:20121022T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121022T160000 CREATED:20120904T140915Z DESCRIPTION:Title : Recent Progress in Development and Application of Non-A dditive Interaction: Models for Molecular Simulations of Biophysical System s.\n\nSpeaker Name: Sandeep Patel\n\nSpeaker Institution : University of De laware LAST-MODIFIED:20230127T203255Z LOCATION: Room 1103\, Bioscience Research Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091007T180000Z DTEND:20091007T190000Z DTSTAMP:20260828T094430Z UID:ndu3bdceusou2ukl7rb9c8sjcg@google.com CREATED:20091002T203254Z DESCRIPTION:Title : HPC Phase VI - the Final Convergence\nSpeaker Name: Tho mas Sterling\nSpeaker Institution : Louisiana State University\nAbstract : Since 2007\, high performance computi ng has been at the beginnings of the most\ndramati c change in form and functi on in the last decade and a half. Since the advent\nof the killer micro and the MPPs and commodity Clusters it spawned supported\nby message-passing programming techniques\, most nota bly MPI\, HPC has been\non an exponenti al curve augmenti ng performance at historic rates through\nincremental changes to feature size\, clock rate\, and architectural complexity. But\nas always happens with S-curves\, HPC i s turning towards its fi nal asymptote and is\nundergoing what may prove to be its 6th and potenti al fi nal phase change. Most\nvisible is the adopti on of multi core heterogeneous system architectures driven\nby constraints in power\, complexity\, clock rate\, and reliability while conti nuing to\ nexploit improvements in feature size to achieve growth in performance. To realize\nthis goal and the achievement of Exascale performance by the end o f the next\ndecade within practi cal limitati ons criti cal advances in eff i ciency\, scalability\, energy\,\nand programmability will be required. In all previous such metamorphoses in HPC\,\nthe underlying principles of a n ew executi on model was used to guide the codesign\nof new architectures\, programming methods\, and system soft ware. Such is\nthe case for the emerg ing HPC Phase VI. This presentati on will discuss the likely\nelements the new executi on model based on the exploratory ParalleX model of\ncomputati on\, and describe key att ributes of architecture\, operati ng\, and runti me\nsystem soft ware\, and programming methods that are likely to gain asce ndency\nover the next decade. Results from recent experiments with HPX prot otype\nrunti me system will be presented. LAST-MODIFIED:20230127T203801Z LOCATION:4122 CSIC Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:GRT-CSCAMM Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221031T203000Z DTEND:20221031T213000Z DTSTAMP:20260828T094430Z UID:4b2mthmo81aeqphpenb96s1qct@google.com CREATED:20221019T190803Z DESCRIPTION:Title: \;Galatic Cosmic Ray Physics with Isotope s

    Speaker: \;Laurent Derome\, \;LPSC\, Fr ance


    Abstract: \;Gala ctic Cosmic rays (CRs) are associated with the most energetic events such a s supernova explosions where the primary CR species such as Carbon and Oxyg en are produced and accelerated. The secondary species\, such as lithium\, beryllium\, and boron are produced as a consequence of nuclear interactions of primary species during their propagation through the interstellar mediu m. The most standard observable to study the propagation of CRs in the Gala xy is the flux ratio of a secondary species to a primary one. Complementary the 10Be radioactive secondary isotope can be used as a clock to determine the cosmic-ray age. In modern CR propagation models\, the radioactive cloc ks are used to determine the halo size L of the Galaxy. Besides the motivat ion for a better characterization of the transport parameters in the Galaxy \, the determination of L is also crucial for setting constraints on dark m atter from indirect detection of anti-particles. In this presentation\, I w ill describe how the AMS experiment can identify and measure the isotopic c omponent of CRs and how such measurements are used to constrain models desc ribing the propagation of CRs.

    Talk recording    < br>
    Notes: Join the meeting at 4:15 for meet and greet
    Vis it https://bit.ly/2PmJoT6  \;to be added to the email list.     LAST-MODIFIED:20221101T043153Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091021T190000Z DTEND:20091021T210000Z DTSTAMP:20260828T094430Z UID:d0l4nbh9h1i7u3a30ct6i668ck@google.com CREATED:20091016T123049Z DESCRIPTION:Title: Metamaterials\n \nBy: John O’Hara & Matthew T. Reiten\n Los Alamos National Laboratory\n \n \nAbstract: \nMetamaterials currently represent a fascinating and fruitful scientific pursuit\, drawing the undi vided attention of \nnumerous research groups worldwide. Metamaterials are also quickly becoming recognized for their increasing \napplicability to t ough technology problems. Particularly in the terahertz (0.1-10 THz) frequ ency regime \nmetamaterials offer solutions that natural materials have fai led to produce for nearly 20 years. High performance \nTHz devices such a s amplitude and phase modulators\, polarization controllers\, absorbers\, a nd anti-reflection \ncoatings have all been recently developed under the me tamaterial paradigm and demonstrate capabilities that should \nhelp propel THz technology into the mainstream. One remaining THz technology problem i s that generation \nschemes either produce very low power or require comple x systems suitable only for dedicated laboratory research. \nHowever\, bec ause of the unique material and wave properties in the THz band\, great pot ential exists for THz \napplications outside of a laboratory environment\, from security screening and imaging to non-destructive evaluation \nand pol lution monitoring. A low cost\, powerful\, and robust THz emitter does not exist but would enable myriad \nviable solutions to THz sensing challenges. \n\nWe will discuss metamaterials concepts in general and then our appro ach to creating a powerful and compact \nsingle frequency THz source based on micron scale metamaterials. The intended design for the “metamitter” is \nbased on asymmetric split ring resonators (SRRs) loaded with resonant tun neling diodes (RTDs) capable of \nconverting a DC bias voltage into THz rad iation. In order to achieve gain\, the resonances of the SRRs and RTDs \nmu st be matched while minimizing losses in order to keep the quality factor s ufficiently high to sustain oscillation. \nThe metamitter design offers a h igh degree of adjustable parameters\, relative ease of fabrication\, low ra diation \nresistance\, and frequency scalability. A planar array of active SRRs will scale in emitted power with increasing \nnumber of elements and w ill provide the capability to tailor the electromagnetic properties of the device as a whole. \nWe will also present the challenges associated with t he transition from passive to active metamaterial structures. LAST-MODIFIED:20230127T203736Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Gree nmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221103T180000Z DTEND:20221103T193000Z DTSTAMP:20260828T094430Z UID:0q1u1s4rm6v5en99cq2641bu8a@google.com CREATED:20221024T152445Z DESCRIPTION:

    Title: \; \;Intertwined Cha rge Density Wave Order and Superconductivity in New Classes of Kagome Metal s

    Host: Johnpierr e Paglione

     \;
    In-Person Location: Toll Physics Rm 1201

    Zoom \;Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

    Refreshments 1:30pm 1117 Toll Physics Bldg.

    LAST-MODIFIED:20221102T142441Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Stephen Wilson\, UC Santa Barbara TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Nov 3_Stephen Wilson.pdf;FMTTYPE=application /pdf:https://drive.google.com/open?id=1sw7oVgdBogRV3NuuyTsU25-Ed7tU7SoC&aut huser=0 END:VEVENT BEGIN:VEVENT DTSTART:20221201T190000Z DTEND:20221201T193000Z DTSTAMP:20260828T094430Z UID:3sgntabfhp196jkaqhba0r4i6h@google.com CREATED:20221122T165359Z DESCRIPTION:Title: \;Kagome Metals

    Metallic kagome lattice materi als are emerging as rich systems for exploring the interplay between topolo gy\, correlation\, and frustrated magnetism. Competing phases and rich phas e diagrams are expected in these materials. Here we focus on hexagonal HfFe 6Ge6-type“166” compounds\, which are a large family o f intermetallics related to CoSn. I will discuss magnetism and transport in MMn6Sn6 \;(M= Y\,Sc\, and Lu) and also some rece nt results involving the charge density wave formed in ScV6Sn6. I will also briefly discuss recent progress in developing the ca pability to perform neutron diffraction under applied electrical current at the Spallation Neutron Source as well as an exciting new family of materia ls in which magnetic moments can be induced by electrical currents.

    Host : Paglione
     \;
    Location: Toll Physics Rm 1201

    Seminar also on Zoom
    Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

    Refreshments 1:30pm 1117 Toll Physics Bldg. LAST-MODIFIED:20221122T171705Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: David Mandrus\, University of Tennessee-Knoxville TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Dec 01_David Mandrus.pdf;FMTTYPE=application /pdf:https://drive.google.com/open?id=1meHnzGIcmuIp_ShH61FIdDyVf2iWSBuG&aut huser=0 END:VEVENT BEGIN:VEVENT DTSTART:20221201T160000Z DTEND:20221201T170000Z DTSTAMP:20260828T094430Z UID:1mouhirigk5ideg0d417hkr7l9@google.com CREATED:20220804T155645Z DESCRIPTION:Literature Seminar

    Speaker: Kwaku Obeng\, UMC P

    Title: \;    Conjugation-ready Oligosaccharides as Gly coconjugate Vaccines LAST-MODIFIED:20221128T161840Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20111114T164500Z DTEND:20111114T173000Z DTSTAMP:20260828T094430Z UID:lodndq1iu154o1et0nfkbisfg0@google.com CREATED:20110922T134247Z LAST-MODIFIED:20230127T203829Z LOCATION:PHYSICS 1305F"TOLL ROOM" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI LUNCHEON-CHRISTOPHE SALOMON TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221107T213000Z DTEND:20221107T223000Z DTSTAMP:20260828T094430Z UID:6u3tjmm54b6rt86qejl1k30unc@google.com CREATED:20221017T144647Z DESCRIPTION:Title: \;Cosmic ray physics with IceTop at the IceCube Neutrino Observatory

    Speaker:&nbs p\;Donghwa Kang\, \;Karlsruhe Institute of Technology\, Germany

    Abstract: \;The IceCube Neutrino Observatory is a cubic-kilometer Cherenk ov detector that is deployed deep in the Antarctic ice at the South Pole. A square kilometer companion surface detector\, IceTop\, located directly ab ove in the in-ice array\, measures extensive cosmic ray air showers with pr imary energies between 100 TeV and 1 EeV. By combining the events measured by IceTop and the in-ice detectors of IceCube in coincidence\, we can recon struct the energy spectra for different primary mass groups. Therefore\, we expect to provide essential information about the origin of cosmic rays\, in particular\, in the transition region from galactic to extra-galactic or igin of the cosmic rays. This talk gives an overview of recent experimental results. In addition\, prospects by the foreseen enhancement of the surfac e detectors of IceTop and the future IceCube-Gen2 surface array are briefly discussed.

    Talk recording

    Notes: Join the meeting at 4:1 5 for meet and greet.  \;
    Visit htt ps://bit.ly/2PmJoT6 to be added to the email list.
     LAST-MODIFIED:20221108T141619Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091008T180000Z DTEND:20091008T193000Z DTSTAMP:20260828T094430Z UID:em7b9cdcmv2trdp5ohm9m8isv0@google.com CREATED:20091002T151806Z DESCRIPTION:Title : Transporting and Controlling Spin in Mesoscale Ferromag netic Semiconductor Devices\nSpeaker Name: Professor Nitin Samarth\nSpeaker Institution : Pennsylvania State University\nAbstract : Heterostructures b uilt from the canonical ferromagnetic\nsemiconductor (Ga\,Mn)As are useful for developing proof-ofconcept\nsemiconductor spintronic devices. After an introductory\noverview of exchange coupling and spin transport in macroscop ic\n(Ga\,Mn)As devices [1\,2\,3]\, we discuss recent experiments that\nprob e spin transport and current-driven magnetization control in\nmesoscale tun nel junctions [4]. These experiments suggest that\nboth correlations and lo calization play a key role in spindependent\ntunneling in (Ga\,Mn)As in the mesoscale regime.\n[1] M. Zhu\, M. J. Wilson\, B. L. Sheu\, P. Mitra\, P. Schiffer\, and N. Samarth\,\nAppl. Phys. Lett. 91\, 192503 (2007).\n[2] M. Zhu\, M.J. Wilson\, P. Mitra\, P. Schiffer and N. Samarth\, Phys. Rev.\nB 7 8\, 195307 (2008).\n[3] M. J. Wilson\, M. Zhu\, R. C. Myers\, D. D. Awschal om\, P. Schiffer and N.\nSamarth\, arxiv:0905.3691.\n[4] P. Mitra\, M. J. W ilson\, K. Thadani\, D. C. Ralph\, P. Schiffer and N.\nSamarth (in preparat ion).\n\nNOTES: preceded by refreshment at 1:30pm in the Toll Room LAST-MODIFIED:20230127T202953Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120719T163000Z DTEND:20120719T173000Z DTSTAMP:20260828T094430Z UID:sooirmfs862e5d30no0g7fc25c@google.com CREATED:20120717T175730Z DESCRIPTION:Speaker: Johannes Blaschke\nTitle: "Granular Brownian Motors i n Non-Idealized Gases"\n\nNote: Pizza will be available for purchase LAST-MODIFIED:20230127T203341Z LOCATION:Large Seminar Room\, ERF 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221115T180000Z DTEND:20221115T190000Z DTSTAMP:20260828T094430Z UID:7fln47gt8phbqvpc2l182np27d@google.com CREATED:20220920T114537Z LAST-MODIFIED:20220920T114537Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221101T160000 DTEND;TZID=America/New_York:20221101T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221101T160000 CREATED:20210423T130624Z DESCRIPTION:Tanmo y Bhattacharya\, Los Alamos National Lab

    Theory and superco mputing advancing the search for new physics in neutron experiments

    The speaker will have a Q&\;A session with students on the same da y at 2pm in PSC 2136.
    \,
    The standard model of particle physics explains almost all observations except that our universe exists\; so\, though it is immensely successful\, it must be incomplete. \; Apa rt from cosmological observations\, experiments either at high-energy or wi th high precision can provide hints about the missing physics. Laboratory e xperiments with neutrons\, nuclei\, atoms and molecules have now reached th e precision necessary to be complimentary to and competitive with high-ener gy accelerator experiments. \; At the same time\, it is only recently t hat computing power has been sufficient to allow one to carry out the corre sponding theoretical calculations with sufficient precision. \; We can\ , now\, start to effectively combine the continually improving experimental limits with the required computations to constrain ideas about physics bey ond the standard model that better fit our cosmological theories. I will di scuss these exciting calculations\, present some results\, point to newly d iscovered issues\, and mention ongoing developments aimed at solving them.< /span>

    About the speaker:
    Dr. Tanmoy Bhattachary a works in the fields of Lattice Quantum Chromodynamics (QCD) for high-ener gy and nuclear physics\, fundamentals of quantum mechanics\, quantum comput ation\, computational approaches to evolutionary biology and linguistics\, data science\, machine learning and vaccine development. \;He attended the Indian Institute of Technology where he received a Bachelor of Science degree in 1982 and Master of Science degree in 1984. In 1989\, Dr. Bhattach arya received his Doctorate of Philosophy in Physics from the Tata Institut e of Fundamental Research. He then joined the Brookhaven National Laborator y at Brookhaven in Long Island as a postdoctoral fellow. After two years in Long Island\, Dr. Bhattacharya moved to France to work at Service de Physi que Theorique. In November 1992\, he moved back to the United States to joi n the high-energy particle theory group at Los Alamos National Laboratory i n New Mexico as a postdoc and in 1999 he became a regular staff member at L os Alamos Labs. Dr. Bhattacharya has made fundamental\, important discoveri es that have been widely employed\; and become a recognized authority natio nally and internationally in the fields of lattice QCD\, evolutionary lingu istics and computational biology.

    Hosted by the Gr aduate Student Colloquium Committee

     \ ;
     LAST-MODIFIED:20221018T161330Z LOCATION:1410 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091209T200000Z DTEND:20091209T210000Z DTSTAMP:20260828T094430Z UID:sh7f51nrb3dk8qc1fuc7sn3tk8@google.com CREATED:20091202T165004Z DESCRIPTION:[Title] "Infrared stability of ABJ-like theories"\n[Speaker] Ma ssimo Siani\n[Institution] Physics Department of Milano-Bicocca University\ , Milan\, Italy\n[Abstract] "We consider marginal deformations of the super conformal ABJM/ABJ models which preserve N=2 supersymmetry. We determine pe rturbatively the spectrum of fixed points and study their infrared stabilit y. We find a closed line of fixed points which is IR stable. The fixed poin t corresponding to the ABJM/ABJ models is stable under marginal deformation s which respect the original SO(4) invariance\, while deformations which br eak SO(4) destabilize the theory which then flows to a less symmetric fixed point. We discuss the addition of flavor degrees of freedom. We prove that in general a flavor marginal superpotential does not destabilize the syste m in the IR. An exception is represented by a marginal coupling which mixes matter charged under different gauge sectors. Finally\, we consider the ca se of relevant deformations which should drive the system to a strongly cou pled IR fixed point."\n LAST-MODIFIED:20230127T203804Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221026T193000Z DTEND:20221026T203000Z DTSTAMP:20260828T094430Z UID:0lctr4nhve7htm7qt9rfceha4d@google.com CREATED:20221021T162808Z DESCRIPTION:

    Title : Multi-GeV e lectron bunches from an all-optical laser wakefield accelerator with optica l guiding of high intensity laser pulses

    Speaker Name: Bo Miao\, Ja ron Shrock\, Ela Rockafellow

    Speaker Institution : University of Ma ryland


    Abstract : Conventional RF electron accelerators are lim ited by breakdown potentials to ~100 MeV/m. This poses significant economic and practical obstacles for the construction of new\, high energy particle accelerators which can be used as advanced light sources\, or as colliders to probe new fundamental physics regimes. Laser Wakefield accelerators (LW FAs)\, which can achieve acceleration gradients 1000 times greater\, offer a promising alternative for the next generation of accelerators.

    L WFAs use the plasma waves (wakes) driven by an ultra-intense laser pulse to accelerate electron bunches to near luminal velocities. For maximal energy gain\, the wave needs to be driven over tens of centimeters in a low-densi ty (~1 x 10^17 cm^-3) plasma. This poses a natural problem since an ultra-h igh intensity laser pulse will diffract on a much shorter scale\, reducing the intensity below that required to drive a wake in the plasma.

    In this talk we will discuss a new method for optically generating plasma waveguides to enable meter scale LWFAs and the first successful implementa tion of the technique to accelerate electron bunches up to 5 GeV in a 20 cm all-optical LWFA. We will present transverse plasma interferometry\, guide d mode images and optical spectra\, electron beam profiles\, and electron s pectra collected during experimental campaigns on the ALEPH laser at CSU\, as well as particle in cell simulations to supplement the physical picture of the acceleration process.


    swisdak@umd.edu \;

    LAST-MODIFIED:20221021T162859Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091001T100000 DTEND;TZID=America/New_York:20091001T120000 DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com RECURRENCE-ID;TZID=America/New_York:20091001T100000 CREATED:00010101T000000Z DESCRIPTION:COLD ATOMS & LOCALIZATION\nJohn Biddle\, Localization in 1-D in commensurate potentials\nJason Kestner\, Effective single-band Hamiltonians for fermions in an optical lattice near a Feshbach resonance\nQi Zhou\, Co oling and detecting schemes in optical lattices\nSankar Das Sarma\, “Locali zation versus percolation as a metal-insulator transition”\nhttp://www.phys ics.umd.edu/cmtc/seminars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220921T193000Z DTEND:20220921T213000Z DTSTAMP:20260828T094430Z UID:593gna573jt2ar785ncttip17c@google.com CREATED:20220815T130229Z DESCRIPTION:Speaker: Dr. Amin Salehi-Khojin\, Associate Professo r\, Mechanical and Industrial Engineering\, University of Illinois at Chica go

    Title: Low Dimensional Mid and High Entropy Chalcogenides: New Fu nctional Materials for Energy Applications

    Abstract: \;The demand for new functional materials requires that we expand o ur search beyond conventional compositions to more exotic ones realized via unconventional design rules. \;Generating mid- and high-entropy struct ures are emerging strategies to stabilize materials entropically for the en hanced functional properties that are not simple linear combinations of the individual component phases. Thus far\, this concept has mainly been explo red for 3D materials\; the potential of high entropy in lower dimensional m aterials\, which by itself imparts attractive functionality (e.g.\, electro nic\, catalytic)\, has yet to be explored. In this talk\, I will discuss th e rich space of low-dimensional (1D and 2D) mid-and high-entropy metal chal cogenide materials to discover\; (i) electrocatalysts with transformational potential to selectively convert carbon emissions into liquid fuel\, (ii) electronic materials with tunable bandgap for operation at high temperature s\, (iii) super lubricant solid materials for operation at high loads and a ir environment\, (iv) super stable ceramic materials for extreme conditions \, and (iv) highly efficient catalysts for Li-gas batteries and water treat ment. Moreover\, I will discuss the kinetics and thermodynamics \;in th e growth of low dimensional materials and in particular anisotropic growth of onedimensional mid-entropy structures. Direct evidence will be provided for the 3D structure of the charge density wave phase in individual structu res at cryogenic \;temperature. LAST-MODIFIED:20220915T170114Z LOCATION:3117 Computer Science Instructional Center (CSI)\, Bldg.\,#406 and Via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221007T170000Z DTEND:20221007T220000Z DTSTAMP:20260828T094430Z UID:21svia0l0hm347pkk1a2l9usl7@google.com CREATED:20220920T121048Z DESCRIPTION:Speakers: \;Hans Kuerten\, Eindhoven Unive rsity of Technology\, Cristina L. Archer\, University of Delaware\, Yahya M odarres-Sadeghi\;\, University of Massachusetts\, Amherst\, and Thaddeus Ko macek\, University of Maryland

    Title: Fluid Dynamics Nineteen th Annual Symposium

    Agenda: \;1:00 – 1:05 \; Welcoming Remarks\, \;Jim Duncan\, \;The \;Burgers \;Program for Fluid Dynamics  \;

    1:05 – 1:50 “Numerical simulation of particle-laden f low for improved plastic recycling” \;(to be pres ented online)\, \;Hans Kuerten\, \;Department of Mechanical Engineering\, Eindhoven University of Technology \;

    1:50 – 2:00\, \;Break\, informal discussions

    2:00 – 2:45&n bsp\;TBD \;(to be presented in person)\, \; Cristina L. Archer\, \;Department of Geography and Spatial Sciences \, University of Delaware

    2:45 – 3:30 \;Graduate student and p ost-doctoral poster session. Refreshments served.

    3:30 – 4:15­ “< b>Obtaining desired trajectories for bodies free to move in the wake of a rotating cylinder” \;(to be presented in person)\, \;< /b>Yahya Modarres-Sadeghi\, \;Department of Mechanical and Indus trial Engineering\, University of Massachusetts\, Amherst

    4:15 – 5:00 ­ “Exoplanet atmospheres as a natural fluid dynamics laboratory: from ultra-hot Jupiters to temperate rocky exoplanets” \;(to be pre sented in person)\, \;Thaddeus Komacek\, \;Department of Ast ronomy\, University of Maryland

    5:00 – 6:00 \; \; \;Re ception and Announcement of Best Posters. \;Refreshments ser ved     LAST-MODIFIED:20220920T124713Z LOCATION:Kim Engr. Bldg.\, 1107 & 1111 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:19th Annual Symposium: The Burgers Program for Fluid Dynamics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100215T173000Z DTEND:20100215T183000Z DTSTAMP:20260828T094430Z UID:vpb9fgcqm7vgh2t24hrt3f0b7c@google.com CREATED:20100203T212234Z DESCRIPTION:Title : Coherent control and quantum simulation in large ion cr ystals\nSpeaker Name: Michael Biercuk\nSpeaker Institution : Ion Storage Gr oup\, NIST-Boulder\nAbstract : We describe experimental efforts aimed at th e realization of \nnonlinear multipartite interactions using planar ion cry stals in a \nPenning trap. This system benefits from the ability to confine large \nion arrays with regular and stable crystalline order without the n eed \nfor significant trap engineering efforts. Of particular interest is \nthe triangular lattice which arises naturally in a two-dimensional \nion crystal\, and which is known to show frustration in the presence \nof spin- spin interactions. Coherent control over trapped ion qubits \nis demonstra ted and characterized through randomized benchmarking\, \nyielding a single -bit operational fidelity of 99.92%. Coherence \nlimits in this system are explored through dynamical decoupling \nprotocols\, dramatically suppressi ng decoherence. A global entangling \ninteraction is engineered using stat e-dependent optical dipole \nforces\, resulting in a simple distance-indepe ndent Ising interaction\, \nand we observe hallmark signatures of spin-moti onal\, and spin-spin \nentanglement in arrays approaching ~150 ions. Experi mental challenges \nsuch as the influence of spontaneous emission are discu ssed\, and a \nnew theoretical framework to fully account for dephasing ind uced by \nelastic Rayleigh scattering is presented.\n LAST-MODIFIED:20230127T203652Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090317T200000Z DTEND:20090317T210000Z DTSTAMP:20260828T094430Z UID:djjrj4j93mht907hpk2govprf8@google.com CREATED:20090306T210838Z DESCRIPTION:Title: Microlensing: Recent Discoveries of Planets and Stellar Remnants \nand their Masses\nSpeaker: Dr. Andrew Gould\, Institute d'Astrop hysique de Paris & Ohio State\nMore Information: Abstract: Because microlen sing is sensitive to mass (not light) it gives us a unique window on dark a nd very dim objects such as black holes\, neutron stars\, old brown dwarfs\ , and planets. It was originally thought that microlensing could not measu re the masses of the individual objects that it detected. But now\, with i ts first dozen planet detections\, we are exploiting subtle effects in the time series and geometry of the lensing \nevent to measure individual masse s and distances. This is giving the first clues to the Galactic distributi on of planets. In the future\, the Space Interferometry Mission will explo it similar effects to make the first census of black holes\, neutron stars\ , and old brown dwarfs.\n\n LAST-MODIFIED:20230127T203901Z LOCATION:CSS Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Astronomy Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111207T193000Z DTEND:20111207T210000Z DTSTAMP:20260828T094430Z UID:qb5bu2p380kt2f344iv9pe41lg@google.com CREATED:20110726T200140Z DESCRIPTION:SPEAKER: Andrei Alexandru - George Washington Univ\, \n\nTITLE: QCD Thermodynamics Using the Canonical Partition Function LAST-MODIFIED:20230127T203633Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110523T180000Z DTEND:20110523T193000Z DTSTAMP:20260828T094430Z UID:7bo2gb56s9nqd41ksf3uinlh7c@google.com CREATED:20110516T150027Z DESCRIPTION:Title : Developing a robust approach to implementing non-Abelia n anyons and topological quantum computing in a modified Kitaev honeycomb l attice model\nSpeaker Name: Haitan Xu\nSpeaker Institution : JQI\nNotes: Pr int flier here: http://www.physics.umd.edu/cmtc/seminars.html\nAbstract : Q uantum computation provides a unique opportunity to explore new regimes of physical systems through the creation of non-trivial quantum states far out side of the classical limit. However\, such computation is remarkably sensi tive to noise and undergoes rapid dephasing in most cases. One potential so lution to these prosaic concerns is to encode and process the information u sing topological manipulations of so-called anyons\, particles in two dimen sions with non-Abelian statistics. Unfortunately\, practical implementation of such a topological system remains far from complete\, both in terms of physical methods but also in terms of connecting the underlying topological field theory with a specific physical model\, including the imperfections expected in any realistic device. Here we develop a complete picture of suc h topological quantum computation using a variation of the Kitaev honeycomb Hamiltonian as the basis for our approach. We show the robustness of this system against noise\, confirm the non-Abelian statistics of the quasi-part icles to be Ising anyons\, and develop new techniques for turning topologic al information into measurable spin quantities. LAST-MODIFIED:20230127T203627Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101202T160000Z DTEND:20101202T170000Z DTSTAMP:20260828T094430Z UID:21fm267t1hgt9151i7s4lctqf4@google.com CREATED:20101118T171645Z DESCRIPTION:[Title] “Outbursts in accreting black-hole systems”\n[Speaker] Jean-Pierre Lasota\n[Institution] Institut d'Astrophysique de Paris & Astro nomical Observatory of the Jagellonian University\n[Abstract] It is widely believed that outbursts in Low-Mass X-ray \nBinaries are due to the same th ermal-viscous instability of the \naccretion disc that is responsible for d warf-nova outbursts. This belief \nis substantiated by the observed propert ies of transient black-hole \nbinaries although the model itself (the Disc Instability Model - DIM) \nsuffers from some rather serious problems even i n the case of \ndwarf-novae for which it was designed. After a short presen tation of the model and its difficulties I will address the question of its \napplicability to the variability observed in Active Galactic Nuclei and \nin the Intermediate-Mass Black-Hole system HLX-1 in the galaxy ESO 243-49 .\n\n LAST-MODIFIED:20230127T203824Z LOCATION:4102 in Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute (JSI) seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100928T200000Z DTEND:20100928T210000Z DTSTAMP:20260828T094430Z UID:qfuuem04a47gpiog3449ig7bp4@google.com CREATED:20100825T174316Z DESCRIPTION:Speaker: Victor Galitski\, University of Maryland\nTitle: Exoti c Quantum Phenomena and Topological Phases in Spin-Orbit-Coupled Systems LAST-MODIFIED:20230127T203657Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081203T203000Z DTEND:20081203T213000Z DTSTAMP:20260828T094430Z UID:r7t9ed6c9obef35v3c7aa0ats4@google.com CREATED:20081201T162420Z DESCRIPTION:Title: Why Do Students Choose (or Avoid) Science-Intensive Majo rs? A Social Cognitive Perspective \nSpeaker: Robert Lent and Matt Miller\ , University of Maryland LAST-MODIFIED:20230127T203444Z LOCATION:Physics Building\, Room 1304 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Education Research Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111107T173000Z DTEND:20111107T183000Z DTSTAMP:20260828T094430Z UID:q32kusss57glsbk9gq4ekmope0@google.com CREATED:20111020T143811Z DESCRIPTION:Speaker: Milos Popovic\, University of Colorado at Boulder\nTit le: Strong-Confinement Silicon Photonics from Telecom-Grade Signal Processi ng to VLSI Electronics-Photonics Integration\nAbstract: Microphotonic circu its based on strong confinement raise the prospect of dense photonic integr ation on a chip\, highly energy efficient on-chip communication links\, and of novel device concepts based on unique device physics and topologies tha t become practical in this regime\, including optical nonlinear effects and optical forces. In this talk\, I will describe the demonstration of teleco m-grade filters and hitless wavelength switches in strong-confinement micro photonics\, and will also talk about device concepts based on localized des tructive mode interference and a new\, unidirectional guided Bloch wave\, t hat enables efficient waveguide crossings\, modulators\, and other opticall y efficient contacted structures. I will describe recent efforts to integra te silicon photonics with advanced CMOS electronics in the front end CMOS p rocess\, and will show the first demonstrations of photonic devices in 65nm and 32nm CMOS technology with no process changes\, compatible with micropr ocessor grade state-of-the-art CMOS. These developments are the first resul ts of current research on deeply integrated photonics in both processor and DRAM memory chip technology. Last\, I will describe how these developments are driving our research into other directions such as photonic circuits b ased on optical forces. \nBiography:\nMiloš Popovic is an Assistant Profess or and Donnelly/GE Faculty Fellow in the Department of Electrical\, Compute r and Energy Engineering\, University of Colorado Boulder. He received his B.Sc.E. degree in Electrical Engineering from Queen’s University\, Canada i n 1999\, and his M.S. and Ph.D. degrees at Massachusetts Institute of Techn ology in 2002 and 2007. His research interests include theory and design of integrated photonic devices for telecom and on-chip interconnect applicati ons\, CMOS photonics integration\, nanooptomechanical devices based on ligh t forces\, and nonlinear and quantum integrated photonics.\n\n LAST-MODIFIED:20230127T203001Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SEMINAR - MILOS POPOVIC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090210T190000Z DTEND:20090210T200000Z DTSTAMP:20260828T094430Z UID:i9t0gpdt961v9q76ch9u37gark@google.com CREATED:20090204T154755Z DESCRIPTION:Title: Renormalization group evolution of neutrino masses and m ixing in Type-III\nseesaw mechanism\nSpeaker: Shamayita Ray\, Tata Institut e of Fundamental Research LAST-MODIFIED:20230127T203443Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100208T173000Z DTEND:20100208T183000Z DTSTAMP:20260828T094430Z UID:m945ucm6h6e8nl9qa0s8ljhlas@google.com CREATED:20100208T133144Z DESCRIPTION:Title: Interferometry at 5/2 Filling Factor and Non-Abelian Qua siparticles\nSpeaker: Bob Willett\, Bell Labs\nAbstract: Correlated two-dim ensional electron systems display varied \nconduction phenomena based upon the multiple statistics at play within \nthe different condensed states. W e will review experimental studies of \nthese states with emphasis on recen t interferometry findings indicating\nnon-Abelian statistics in the excitat ions of the unique fractional \nquantum Hall condensate at 5/2 filling fact or. LAST-MODIFIED:20230127T203805Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081013T200000Z DTEND:20081013T210000Z DTSTAMP:20260828T094430Z UID:0kd1r1v7o4b5gtv8fn73m3cplg@google.com CREATED:20081008T150819Z DESCRIPTION:Speaker: Cynthia Wolberger\, Co-Director\, Department of Bioph ysics and Biophysical Chemistry\, Johns Hopkins University\, Baltimore\, MD \nTitle: "Regulation by Lysine Modification:Mechanisms of Sir2 deacetylat ion and polyubiquitin chain assembly" LAST-MODIFIED:20230127T203504Z LOCATION:IPST Bldg\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090507T161500Z DTEND:20090507T171500Z DTSTAMP:20260828T094430Z UID:dgoccd00q9aa0n9uqntkunt6ck@google.com CREATED:20090223T210358Z DESCRIPTION:Title: Model Inflation\nSpeaker: C. David Levermore\, Universit y of Maryland LAST-MODIFIED:20230127T203451Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120504T190000Z DTEND:20120504T200000Z DTSTAMP:20260828T094430Z UID:qofapjlk1rb21pgf9mvtiph0jk@google.com CREATED:20120424T142011Z DESCRIPTION:Title : Process Integration for Scale-up of Low Temperature Sol id Oxide Fuel Cells at UMERC\nSpeaker Name: Hee Sung Yoon\nSpeaker Institut ion : University of Maryland Energy Research Center\nAbstract : Fuel cells convert the chemical energy of a fuel into electrical energy by the electro chemical reaction with oxygen. Among these\, solid oxide fuel cells (SOFCs ) can operate directly on hydrocarbon fuels (such as natural gas\, biomass\ , propane\, and gasoline) as well as pure hydrogen. However\, the SOFC oper ating temperature\, from 600 to 1000°C\, is significantly higher than that of other fuel cell systems. High temperature operation\, over 700°C\, limit s commercial deployment due to high cost of fabrication and operation coupl ed with the degradation of SOFC stack performance at these temperatures. Ou r ongoing research focuses on reducing the operating temperature to overcom e those problems. \n\nRecently\, we developed a high-power SOFC that operat es at significantly lower temperature\, 400 to 650°C\, by controlling the m icrostructure of the interface between the electrolyte and electrode using a simple infiltration technique to increase the number of catalytic sites f or the half-cell reactions. In addition\, an integrated process for large- scale cell fabrication has been developed using tape casting and the infilt ration technique as a low cost fabrication method. These advances have trem endous potential for mobile and stationary power generation.\n\n LAST-MODIFIED:20230127T202947Z LOCATION:UMERC Conference Room\, 1202 Engineering Lab Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090930T100000 DTEND;TZID=America/New_York:20090930T120000 DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com RECURRENCE-ID;TZID=America/New_York:20090930T100000 CREATED:00010101T000000Z DESCRIPTION:TOPOLOGICAL AND FQHE\nMike Peterson\, Quantum Hall phase diagra m of second Landau-level half-filled bilayers: Abelian versus non-Abelian states\nKai Sun\, Topological phases of dipolar particles in elongated Wann ier orbitals\nMeng Cheng\, Topological superconducting phases in two-dimens ional fermion models\nJay Sau\, Possibility of observing the physics of Maj orana Fermions in semiconductor-superconductor heterostructures\n\nhttp://w ww.physics.umd.edu/cmtc/seminars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100202T160000Z DTEND:20100202T170000Z DTSTAMP:20260828T094430Z UID:mh2ut0f2cbojepv97eet8r4sdo@google.com CREATED:20100127T202535Z DESCRIPTION:SPEAKER: VICTOR MUNOZ\, Madrid\, Spain\n\nTITLE: New Insights into Protein Folding Mechanisms from\n Large-Scale Analysis of Mutational Effects LAST-MODIFIED:20230127T203752Z LOCATION:0112 Chemistry\, Marker Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL SEMINAR -- BIOCHEMISTRY SERIES TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120123T164500Z DTEND:20120123T171500Z DTSTAMP:20260828T094430Z UID:rfomleocdq2a4qo3gjd6eop90o@google.com CREATED:20120111T142906Z LAST-MODIFIED:20230127T203859Z LOCATION:Physics 1305F "New Toll Room" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221101T150000Z DTEND:20221101T160000Z DTSTAMP:20260828T094430Z UID:0la52q6ap2b1qkauk42o4g5qij@google.com CREATED:20221004T183701Z DESCRIPTION:When: November 1st at 11am
    Where : ATL 4402
    Speaker: Dr. Victor Albert (NIST)
    Title:  \;Spin chains\, defects\, and quantum wires for the quantum-double edg e
    Abstract: \;    Non-Abelian defects t hat bind Majorana or parafermion zero modes are prominent in several topolo gical quantum computation schemes. Underpinning their established understan ding is the quantum Ising spin chain\, which can be recast as a fermionic m odel or viewed as a standalone effective theory for the surface-code edge - - both of which harbor non-Abelian defects. We generalize these notions by deriving an effective Ising-like spin chain describing the edge of quantum- double topological order. Relating Majorana and parafermion modes to anyoni c strings\, we introduce quantum-double generalizations of non-Abelian defe cts. We develop a way to embed finite-group valued qunits into those valued in continuous groups. Using this embedding\, we provide a continuum descri ption of the spin chain and recast its non-interacting part as a quantum wi re via addition of a Wess-Zumino-Novikov-Witten term and non-Abelian bosoni zation. LAST-MODIFIED:20221024T131202Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090330T163000Z DTEND:20090330T173000Z DTSTAMP:20260828T094430Z UID:ek84qrne8kqfrjq9u8j9jpu2kc@google.com CREATED:20090202T164248Z DESCRIPTION:Title: Coherent Optical Control of Qubits in Quantum Dots\nSpea ker: Duncan Steel\, University of Michigan LAST-MODIFIED:20230127T203350Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100310T203000Z DTEND:20100310T213000Z DTSTAMP:20260828T094430Z UID:93rn8vp5em6eltd0c30a7ctnls@google.com CREATED:20100304T212014Z DESCRIPTION:Title: Synthesis of Functionalized Graphene\, Covalently Immobi lized Graphene Films and Patterned Structures\nBy: Prof. Mingdi Yan\nPortla nd State University\n \nAbstract:\nThe ability to chemically derivatize gra phene with well-defined functionalities is a major challenge in graphene re search. We have developed a versatile approach for the covalent functionali zation of graphene\, based on a class of heterobifunctional agents\, perflu orophenylazides (PFPAs).[1-4] UV or heat activation of PFPA yields the sing let nitrene which undergoes C=C addition reactions with graphene to give th e aziridine structure. Using this method\, graphene with well-defined surfa ce functionalities were synthesized from solution-exfoliated graphene.\n \n To fabricate covalently immobilized graphene\, the substrate\, for example\ , silicon wafer or gold film\, was first treated with PFPA. Graphene sheets were subsequently attached by a simple heat treatment under ambient condit ions.[5] The formation of single- and few-layer graphene was confirmed by R aman and AFM. Evidence of covalent bond formation between graphene and the substrate was provided by X-ray photoelectron spectroscopy (XPS).\n \nWe ha ve furthermore fabricated patterned graphene structures by coating the PFPA -surface with graphene followed by photolithography.[6] Features from micro meters to centimeters were fabricated on wafers\, glass slides\, and gold f ilms. LAST-MODIFIED:20230127T203404Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park \, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110906T150000Z DTEND:20110906T163000Z DTSTAMP:20260828T094430Z UID:gir4fbfjbbo3e88st6lb75tkrs@google.com CREATED:20110729T151219Z DESCRIPTION:Title : Origin of 1/f magnetic noise in superconducting circuit s\nSpeaker Name: Kostyantyn Kechedzhi\nSpeaker Institution : Rutgers\nAbstr act : We analyze theoretically possible origins of the recently observed 1/ f noise in the complex inductance of SQUIDs. The experimental data indicate a large cross-correlation of the inductance noise with the usual flux nois e which is the dominant cause of decoherence in flux and phase qubits. Unde rstanding of this phenomena sheds a new light on the long standing problem of 1/f flux noise in superconducting circuits. Our analysis shows that in S QUIDs with relatively small loops (under 1 micron) the inductance noise is dominated by the kinetic inductance fluctuations due to the dynamics of cha rged impurities\; whereas in SQUIDs with large loops (much larger 1 micron) the inductance noise is dominated by magnetic coupling of the loop to a sy stem of unpaired spins localized on the surface of the superconducting wire s. Moreover\, we argue that the cross-correlations in the magnetic noise ob served in large SQUIDs (perimeter of order of 100 micron) imply a formation of long range order in fractal spin structures on the surface of the super conducting loop. We show that such structures appear naturally in a random system of spins with wide distribution of spin-spin interactions\; and that the fractal nature of this ferromagnetic state manifests in $1/f^{1+\\zeta }$ spectra of magnetization noise\, with small exponent $\\zeta$\, and larg e cross-correlations in the magnetic noise which reproduce inductance-flux cross-correlations observed in SQUIDs. LAST-MODIFIED:20230127T203347Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121212T203000Z DTEND:20121212T213000Z DTSTAMP:20260828T094430Z UID:8r0isvno6v1ei9asufu42hm7ig@google.com CREATED:20120928T132122Z DESCRIPTION:Title:Two-photon interference from disparate quantum systems\nS peaker: Dr. Glenn Solomon\nNational Institute of Standards and Technology\, Gaithersburg\, MD\nand Joint Quantum Institute\, College Park\, MD\n\nAbst ract: The bosonic nature of light insures that upon interference two indist inguishable photons can coalesce into a single inseparable state. However\, single photons produced by fundamentally dissimilar physical processes wil l generally not be indistinguishable\, and thus will not coalesce. Photoni c based quantum networks may depend on creating inseparable photon states b y coalescence. Yet\, these networks will likely be composed of different t ypes of subsystems and thus photon indistinguishability is unlikely.\n\nUsi ng quantum dots and parametric down conversion\, I will discuss experiments [1-3] where we manipulating dissimilar quantum sources to produce mutually indistinguishable photons. I will show how the indistinguishability and c oherence properties of the quantum dot source can be affected by the quantu m dot pumping strategy.\n\n[1] E. B. Flagg\, et al.\, Phys. Rev. Lett. 104\ , 137401 (2010).\n[2] S. Polyakov\, et al.\, Phys. Rev. Lett. 107\, 157402 (2011).\n[3] E. B. Flagg\, et al.\, Phys. Rev. Lett. 109\, 163601 (2012).\n \n\nPlease contact Dr. Kevin Osborn (LPS\, osborn@lps.umd.edu) if you would like to meet Dr. Solomon before the seminar. He and Prof. Chris Lobb (UMD Physics\, lobb@squid.umd.edu) are the hosts of the seminar series.\n LAST-MODIFIED:20230127T203530Z LOCATION:LPS Seminar Room\, Lower Level\, LPS\, 8050 Greenmead Dr.\, Colleg e Park\, MD\, 301-935-6400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221107T160000Z DTEND:20221107T170000Z DTSTAMP:20260828T094430Z UID:6qbbqv481re254h8v0flrt6n01@google.com CREATED:20220817T195350Z DESCRIPTION:

    Talk title: Machine Learning with In-Physics Comp uting

    Speaker: Dirk Englund\, Massachusetts Institute of Tech nology

    Abstract: This talk presents recent progress in photon ic integrated circuits and solid-state artificial atoms for processing clas sical and quantum information in deep learning neural networks architecture s. These developments can lead to faster and more energy-efficient computin g architectures that solve problems with complexities beyond today’s system s.

     LAST-MODIFIED:20221028T195323Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Dirk Englund TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100921T171500Z DTEND:20100921T183000Z DTSTAMP:20260828T094430Z UID:vobqpp0e6o0lg9pfh3t383gf2s@google.com CREATED:20100913T135026Z DESCRIPTION:Title : Flows in Quantum Fluids: Do We Know What Fields or Equa tions to Use?\nSpeaker Name: Professor Daniel Lathrop\nSpeaker Institution : UMCP\nNotes: As in the past\, each seminar will be preceded by an INFORMA L CAFETERIA LUNCH to which all are welcome\, departing from room 1108 about five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T203456Z LOCATION:oom 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210505T150000Z DTEND:20210505T160000Z DTSTAMP:20260828T094430Z UID:0t5ks3u9i68piu005kj3k3m3vj@google.com CREATED:20210428T142711Z DESCRIPTION:Speaker: Mario Lopez\, Grad Asst II\, CMNS-Chemistry &\; Bio chemistry\, UMD

    Title: From Theory to Reality: Electrically Induced Antiferromagnetic Switching

    Abstract: There is a growing demand for compact and faster memory. Since\, antiferromagnetic materials are not effe cted by external magnetic fields and have fast spin dynamics\, they would b e the ideal materials to be used for memory given the requirements demanded by the market. However\, the use of these materials in memory have remain elusive to researchers as there is no practical way to reorient the antifer romagnetic order. This seminar focuses on the series of papers that were ab le to predict &\; confirm antiferromagnetic switching induced by electri cal current.

     \;Reference Papers:

     \;J. Železný\, H. Gao\, K. Výborný\, J. Zemen\, J. Mašek\, Aurélien Manchon\, J. Wunderlich\, Jairo Sinova\, and T. Jungwirth. \;Relativistic Néel-Order Fields Induced by Electrical Current in Antiferromagnets. Phys. Rev. Lett. \;2014\, 113\ , 157201

    1. P. Wadley\, B. Howells1\, J. Železný\, C. Andrews\, V. Hills\, R. P. Campion1\, V. Novák\, K. Olejník\, F. Maccherozzi\, S. S. Dhe si\, S. Y. Martin\, T. Wagner\, J. Wunderlich\, F. Freimuth\, Y. Mokrousov\ , J. Kuneš\, J. S. Chauhan\, M. J. Grzybowski1\, A. W. Rushforth\, K. W. Ed monds\, B. L. Gallagher\, T. Jungwirth. \;Electrical switching of an an tiferromagnet. Science. \;2016\, 351 (6273)\, 587-590
    2. M. J. Grz ybowski\, P. Wadley\, K. W. Edmonds\, R. Beardsley\, V. Hills\, R. P. Campi on\, B. L. Gallagher\, J. S. Chauhan\, V. Novak\, T. Jungwirth\, F. Maccher ozzi\, and S. S. Dhesi. Imaging Current-Induced Switching of Antiferromagne tic Domains in \;CuMnAs. Phys. Rev. Lett. 2017 \;118\, 057701.
    LAST-MODIFIED:20230127T203502Z LOCATION:Where: go.umd.edu/pchem_spring2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081030T163000Z DTEND:20081030T173000Z DTSTAMP:20260828T094430Z UID:djsu604njpnpbmlg74uu3vril0@google.com CREATED:20081027T155051Z DESCRIPTION:Speaker: Colin McCann\, Dept of Physics\, UMD and National Can cer Institute\, NIH\nTitle: Group dynamics and quorum sensing during Dicty ostelium discoideum chemotaxis LAST-MODIFIED:20230127T203409Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100920T183000Z DTEND:20100920T193000Z DTSTAMP:20260828T094430Z UID:kefj5g8962ttdqni8s5fach8o0@google.com CREATED:20100914T131045Z DESCRIPTION:Title : Topological insulator and superconductor in spin-orbit coupled semiconductors\nSpeaker Name: Chuanwei Zhang\nSpeaker Institution : Washington State University\nNotes: For more events see website:\nhttp://w ww.physics.umd.edu/cmtc/seminars.html\nAbstract : Spin-orbit is the physica l origin of many important topological phenomena\, ranging from the intrins ic anomalous and spin Hall effects in ferromagnetic semiconductors\, the qu antum spin Hall insulator\, to the recently discussed Majorana physics in s emiconductor/superconductor heterostructure. In this talk\, I will discuss three recent work in my group on this topic: 1) A quantized anomalous Hall insulator in a nanopatterned two-dimensional electron gas\; 2) Proximity in duced chiral f-wave superconductivity and Majorana fermions in a hole-doped semiconductor-superconductor heterostructure\; 3) Robustness of Majorana m odes and minigaps in an electron doped semiconductor-superconductor heteros tructure. LAST-MODIFIED:20230127T203055Z LOCATION:PHYS 2205 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110516T170000Z DTEND:20110516T183000Z DTSTAMP:20260828T094430Z UID:8icvbif9t73g8s4kifpgf40m30@google.com CREATED:20110509T184438Z DESCRIPTION:Title: Extra/Mirror Families and Inert Dark Matter after XENON1 00\nSpeaker: Yue Zhang\nInstitution: Abdus Salam ICTP-Trieste\, Italy\nABST RACT: We show that mirror families\, naturally present in a number of new p hysics setups\, require the existence of an inert scalar doublet to pass th e electroweak precision tests and the mass spectrum of new states are well predicted. This provides a natural motivation for considering the inert dou blet as a dark matter candidate. We study the consequence of the enhanced d irect detection cross sections due to the heavy chiral fermions\, in view o f recent XENON100 data. We also study the impact on the SM Higgs mass limit s in such framework.\n LAST-MODIFIED:20230127T203053Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear & Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131120T190000Z DTEND:20131120T203000Z DTSTAMP:20260828T094430Z UID:rlgnbqmvbgpnuijef22hfq4mps@google.com CREATED:20131118T141947Z DESCRIPTION:Title : "Recent Discoveries of Cosmic Ray Anomalies"\n\nSpeaker Name: Eun-Suk Seo\n\nSpeaker Institution : University of Maryland\n LAST-MODIFIED:20230127T203603Z LOCATION:1305F Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090406T163000Z DTEND:20090406T173000Z DTSTAMP:20260828T094430Z UID:ts217ie0q8n15bauqheef3j83c@google.com CREATED:20090202T164415Z DESCRIPTION:Title: The Spatial Dependence of Entanglement and Quantum nonlo cality in EPR\nSpeaker: Shih-Yuin Lin\, National Center for Theoretical Sci ences\, Taiwan LAST-MODIFIED:20230127T203040Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090202T213000Z DTEND:20090202T223000Z DTSTAMP:20260828T094430Z UID:70ivnnv31lana3csg5c6h3bv2o@google.com CREATED:20090131T191101Z DESCRIPTION:Speaker: Dr. Marc Swisdak\, University of Marylnad\nTitle: Magn etic Reconnection in the Solar Wind and at the Heliopause LAST-MODIFIED:20230127T203206Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130419T150000Z DTEND:20130419T163000Z DTSTAMP:20260828T094430Z UID:o5u2bm9p5rbkmmr845sukcora8@google.com CREATED:20130408T155950Z DESCRIPTION:Title: Topological insulators of bosons in three dimensions\n\ nSpeaker Name: T. Senthil\n\nSpeaker Institution: Massachusetts Institute of Technology \n\nAbstract: I review recent progress in understanding the physics of three dimensional analogs of topological insulators in systems of interacting bosons. I discuss the properties of their protected surface phases\, structure of the bulk wave functions\, and if applicable\, their b ulk electromagnetic response. Finally I show that these phases provide a ve ry insightful window into the physics of the much more exotic quantum spin liquid phases. LAST-MODIFIED:20230127T202953Z LOCATION:Phys 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110316T200000Z DTEND:20110316T213000Z DTSTAMP:20260828T094430Z UID:src4aodtn4f0pt6aqgiogg0cig@google.com CREATED:20110311T203654Z DESCRIPTION:Title : "A Mass Dependent Forward-Backward Asymmetry in Top Qua rk Pair Production at the Tevatron"\nSpeaker Name: Dr. Dan Amidei\nSpeaker Institution : University of Michigan\n LAST-MODIFIED:20230127T203529Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131015T200000Z DTEND:20131015T210000Z DTSTAMP:20260828T094430Z UID:o30baumqrkvdn1nbkr3v7c72ko@google.com CREATED:20130821T151717Z DESCRIPTION:Speaker: Paulo Bedaque\, University of Maryland\nTitle: The d ensest matter in the Universe\nAbstract: Matter of any kind\, when compres sed enough\, turns into "neutron matter". This is what is believed to happe n in the interior of neutron stars. The physics of neutron matter is domina ted by the strong interactions (QCD) in its non-perturbative regime and\, a s such\, has resisted theoretical analysis for decades. We will discuss how some aspects of neutron matter are beginning to be understood by a combina tion of low energy effective field theory methods and observations.\n LAST-MODIFIED:20230127T203912Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130404T180000Z DTEND:20130404T193000Z DTSTAMP:20260828T094430Z UID:5asu52danuprbbqd3n3uqkpcas@google.com CREATED:20130401T174524Z DESCRIPTION:Speaker: Farhan Rana\, Cornell University\n\nTitle: Graphene M icro and Nano-Plasmonics: Experiments and Theory\n \nAbstract: The unique a nd electronic\, optical\, and plasmonic properties of graphene has made it a promising candidate for device applications. Plasmons in graphene are rob ust collective excitations that are strongly coupled to interband electroni c transitions as well as to graphene and substrate phonons. Confined plasmo ns in graphene micro and nanostructures can be probed optically thereby pro viding a laboratory to study electron-electron and electron-phonon interact ions in graphene. In this talk\, we will present our experimental and theor etical results on graphene plasmons. Experiments reveal that the long wavel ength confined plasmon modes are well described by an eigenvalue equation. Plasmons modes in neighboring structures interact strongly and these intera ctions can also be described by the eigenvalue equation. We measure plasmon resonances in fabricated nanostructures of dimensions approaching 10 nm. P lasmons losses have been measured to increase with the plasmon frequency. We also present results from ultrafast optical/THz spectroscopy of graphene and show that the observed carrier dynamics are consistent with very fast electron-electron interaction dominated electron-hole recombination rates o n short time scales (< 1 ps)\, carrier cooling by optical phonons on medium time scales (1-50 ps)\, and carrier cooling by acoustic phonons on long ti me scales (> 50 ps). The role of electron-plasmon interaction in the recomb ination rates will be discussed. Accurate electromagnetic FDTD models have been developed that can help design graphene plasmonic devices for various applications. A summary of recent device results will be presented in this talk. \n\nHost: David Abergel LAST-MODIFIED:20230127T203822Z LOCATION:Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T180000Z DTEND:20220204T190000Z DTSTAMP:20260828T094430Z UID:6ahe1eb3plhcamiuva02ec0bdl@google.com CREATED:20220126T144314Z DESCRIPTION:Speaker: \; \;En-Jui Kuo (UMD)
    Title:& nbsp\; \;Boson Sampling for Generalized Bosons
    Abstract:  \; \;We generalized the standard Boson sampling task including Linear B oson Sampling the Gaus- sian Boson Sampling from photons to what we call ge neralized boson system which the computation relation between the creation and annihilation operators is not a constant. We showed that in such a syst em\, one still has the standard hardness results including Hafnian and Perm anents. We also use the spin system as our example and provide an experimen tal setup.

    broadcast on Zoom: \;https://umd.zoom.us/j/9616017 7762

    (pizza and drinks served after the talk) LAST-MODIFIED:20230127T203122Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: En-Jui Kuo (UMD) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100122T190000Z DTEND:20100122T200000Z DTSTAMP:20260828T094430Z UID:4q86vme7sd1kqndfqmh3jg6b4c@google.com CREATED:20100113T161052Z DESCRIPTION:Title: TMR Recording Heads: Past and Future\n\nSpeaker: Sining Mao\, Western Digital\n\nAbstract: rising need in the consumer electronics field for high capacity data storage has created strong demanded continuou s increases in areal density. Increased areal density requires both linear and track-density improvements. CPP recording head technology provides adv antages due to the narrow spacing of the shields and better side reading. O ne of the technical challenges in realizing CPP heads is how to increase ef fective GMR ratio dR/R to achieve enough readback amplitude and signal-to-n oise ratio. Today\, with large amplitude and improved SNR performance\, mag netic tunnel junction\, or Tunneling MR (TMR) head design has become a tech nology choice after the CIP GMR heads. MgO barrier material with giant TMR ratio for more than 100% at low RA of 1~2 ohmcm2 provides more opportunity for extending the TMR recording head applicability for future generations. In this presentation\, a historic view of TMR head development in the HDD i ndustry will be given. Fundamental head design\, structure\, and physics wi ll be reviewed. Recent advancements on TMR head design also will be discuss ed.\n\n LAST-MODIFIED:20230127T203440Z LOCATION:Room 2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221110T190000Z DTEND:20221110T203000Z DTSTAMP:20260828T094430Z UID:6f1vse90vcdvd6eeg16t5ar0p7@google.com CREATED:20221004T140630Z DESCRIPTION:Speaker: Kaori Fuyuto\, LANL

    Title : Searc hing for new physics in violations of fundamental symmetries

    Abstract : The Standard Model (SM) of Particle Physics has successfully passed virtu ally every empirical test in the laboratory so far. However\, there are sti ll some major puzzles that cannot be explained by the SM in our Universe\, e.g.\, the baryon asymmetry of the Universe\, the existence of dark matter\ , and the origin of neutrino mass. One key approach to solving these puzzle s is the search for violation of fundamental symmetries such as CP symmetry and conservation of lepton number and flavor. In this talk\, I will discus s how solutions to the above mysteries coming from physics beyond the SM ca n be probed by fundamental symmetry tests in searches for electric dipole m oments and neutrinoless double beta decay.

     LAST-MODIFIED:20221028T153424Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100204T171500Z DTEND:20100204T181500Z DTSTAMP:20260828T094430Z UID:4um9udhtkbusm7qqifabkj34kk@google.com CREATED:20100125T155423Z DESCRIPTION:Title : Applied Dynamics Seminar - A Modified Lyapunov Dimensio n for One-Way Coupled System\nSpeaker Name: Brian Hunt\nSpeaker Instituti on : University of Maryland LAST-MODIFIED:20230127T203405Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Research in Electronics & Applied Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091102T200000Z DTEND:20091102T210000Z DTSTAMP:20260828T094430Z UID:6g6j1e9qk1g20ckd3ocb2c6lr8@google.com CREATED:20091027T184105Z DESCRIPTION:[Title] Maximal Supersymmetry in Light-Cone Superspace\n[Speake r] Dmitry Belyaev\n[Institution] University of Florida\n[Abstract] Maximall y supersymmetric theories arise naturally as limits of the\nstring/M-theory . Amazingly enough\, they can all be described by a\nsingle constrained (on -shell) superfield living in light-cone\nsuperspace. When the theory is als o (super)conformal\, it is completely\ndetermined by the (dynamical) supers ymmetry transformation of the\nlight-cone superfield. I will describe how o ne finds this key\ningredient in the d=4 N=4 super-Yang-Mills theory and in the d=3 N=8\nBagger-Lambert-Gustavsson theory. LAST-MODIFIED:20230127T203628Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130430T190000Z DTEND:20130430T200000Z DTSTAMP:20260828T094430Z UID:75ra5kduqeft15uk4u69h8i0no@google.com CREATED:20130426T155943Z DESCRIPTION:Title : Constraining and detecting dark photon\n\nSpeaker Name: Haipeng An\nSpeaker Institution : Perimeter Institute\n\nAbstract : Based on my recent work with Maxim Pospelov and Josef Pradler\, http://arxiv.org/ abs/1302.3884 and http://arxiv.org/pdf/1304.3461.pdf\, I will talk about th e stellar production of vector states V within the minimal model of "dark p hotons". I will show that when the Stuckelberg mass of the dark vector beco mes smaller than plasma frequency\, the emission rate is dominated by the p roduction of the longitudinal modes of V\, and scales as \\kappa^2 m_V^2\, where \\kappa and m_V are the mixing angle with the photon and the mass of the dark state. This is in contrast with earlier erroneous claims in the li terature that the emission rate decouples as the forth power of the mass. W e find that stellar bounds for m_V LAST-MODIFIED:20230127T203013Z LOCATION:2202 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090904T170000Z DTEND:20090904T180000Z DTSTAMP:20260828T094430Z UID:7441ar3csodghv2a3t1hill6mc@google.com CREATED:20090901T151508Z DESCRIPTION:Title : Indiana Jones and the Search for Apollo-Modern Day Adve ntures in Materials Science\nSpeaker Name: Dr. D. Elizabeth (Betsy) Pugel\n Speaker Institution : NASA-Goodard Space Flight Center\nAbstract : The stag e is set as a warehouse lined with dusty wooden crates in the Smithsonian I nstitution’s Air and Space Museum Archives\; nights poring over 40-plus yea r old documentation\, interviews with the men and women of the Apollo era\; fabrication\, testing\, and measurement at seven NASA field centers. Such is life in the applied research world of materials science a world that br ings with it many an adventure. Tasked with the development and productio n of two composite-based ablative heat shields to protect astronauts on re- entry to Earth’s atmosphere for post-Shuttle missions\, my team and I embar ked on an interdisciplinary journey into a little-known realm of archaeolog ical materials development. Armed with history\, cracking fiber optical wh ips for non-destructive analysis and testing\, constrained by boulders of mechanical\, aerothermal\, environmental and other requirements—this collab orative team of scientists\, engineers\, historians\, museum archivists\, a nd !\n\nmachinists set out on a rich experimental expedition and unearthed the historical process for fabricating the Apollo heat shield\, revising i t with modern technological twists. Come along as we relive this adventure in materials science and celebrate the 40th Anniversary of the Apollo Moon Landing.\n LAST-MODIFIED:20230127T203120Z LOCATION:2108\, Chemical and Nuclear Eng. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ENGR-Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121018T173000Z DTEND:20121018T180000Z DTSTAMP:20260828T094430Z UID:52e61r6imeukhcsdnisphu83ag@google.com CREATED:20121010T181825Z LAST-MODIFIED:20230127T203400Z LOCATION:Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110926T203000Z DTEND:20110926T213000Z DTSTAMP:20260828T094430Z UID:m8adhpuvk54multuhuhg11movs@google.com CREATED:20110908T195621Z DESCRIPTION:Title : Search for magnetic monopoles\nSpeaker Name: Nicolas PI COT-CLEMENTE\nSpeaker Institution : University of Maryland\, Institute for Physical Science and Technology\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM \nAbstract : The ANTARES underwater neutrino telescope\, located in the Med iterranean Sea at a depth of 2500m\, 40km off the Provencal coast\, is comp osed by an array of 885 photomultipliers distributed on 12 vertical lines. The detector is fully operational since May 2008.\nBesides the detection of neutrino-induced muons\, the telescope is more generally sensitive to part icles which emit Cherenkov light\, and\, thanks to its large volume\, offer s new opportunities to improve the sensitivity to exotic particles\, such a s magnetic monopoles.\nMagnetic monopoles are stable magnetically charged p articles first introduced in a consistent manner by Dirac in 1931\, which s howed that their own existence would give an explanation to the quantizatio n of the electric charge. They would have been produced in the Early Univer se\, and would bring a first proof to the existence of grand unified models .\nAfter having presented the ANTARES neutrino telescope and its last resul ts\, magnetic monopoles will be introduced\, as well as their signal caract eristics in a neutrino telescope. Then\, the analysis which uses a dedicate d algorithm able to reconstruct the velocity of the incoming particles will be described.\nFinally\, after applying the analysis on the data taken in 2008\, a new upper limit on the magnetic monopole flux is presented. It bec omes the best worldwide constraint in the velocity range β=[0.625\,1]\, and improves for the first time below the Cherenkov threshold the sensitivity obtained with a neutrino telescope. \n LAST-MODIFIED:20230127T203030Z LOCATION:Location: Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221128T160000Z DTEND:20221128T170000Z DTSTAMP:20260828T094430Z UID:2k6cf3p8fb7kjudl5c8us0khmn@google.com CREATED:20220830T164238Z DESCRIPTION:Speaker: Jonathan Simon\, Stanford University

    Title: \;Cavity QED from Manybody Physics to Trans duction

    Abstract: \;In this talk\, I will descr ibe recent developments in the Simon/Schuster collaboration\, where we are harnessing cavity quantum electrodynamics for both manybody physics and qua ntum information. I will begin with an overview of our photonic quantum mat erials efforts\, highlighting the analogy between photons in a lattice of c avities (or family of cavity modes) and electrons in solids. I will then fo cus in on our explorations of Hubbard physics in a quantum circuit\, where we have demonstrated reservoir engineering approaches to stabilizing incomp ressible solids\, and more recently\, disorder-assisted adiabatic approache s to preparation of compressible fluids and even cat states of fluids. Fina lly I will change gears and talk briefly about interfacing superconducting and optical cavities using Rydberg atoms\, where we have just demonstrated a quantum limited mmwave-to-optical transducer with >\;50% transduction e fficiency\, 100’s of kHz of bandwidth\, and less than one noise photon.
    LAST-MODIFIED:20221121T175745Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Jonathan Simon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221215T180000Z DTEND:20221215T190000Z DTSTAMP:20260828T094430Z UID:44vc6ifcqpi0h2mksjr8ecdhgu@google.com CREATED:20221213T203905Z DESCRIPTION:Thesis Defense12/15/2022 at 1:00 pm ET&nbs p\;
    Location: \;John S. Toll Physics Building 2219 \;
    Speaker: \;Ruizhi Pan \;
    Title: \;Applications of artificial neural networks in learning quantum systems LAST-MODIFIED:20221213T203905Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Title Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120505T233000Z DTEND:20120506T003000Z DTSTAMP:20260828T094430Z UID:c8has0bej2e2df97pt1ufrvak0@google.com CREATED:20110818T204147Z DESCRIPTION:A collection of our best demonstrations\, including the mysteri ous psychoacoustic vibration transducer\, the lovely laser waterfall\, and the infamous “eight ways to smash a can.” Vote for your favorite! \n\nDoors open 7:00PM\nFor directions and further information call 301-405-6045 or v isit www.physics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203556Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Greatest Hits of Physics Demonstrations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111102T190000Z DTEND:20111102T200000Z DTSTAMP:20260828T094430Z UID:q86sgp934ps64eqca3q9r76h4k@google.com CREATED:20111027T174155Z DESCRIPTION:Title: Modeling acoustic wave interactions with solitary intern al waves in shallow ocean environments\nSpeaker: Dr. Steven Finette\, Acous tics Division\, Naval Research Laboratory \nAbstract: Transmission of infor mation across significant distances under the ocean surface can be accompli shed by acoustic waves\, due to their low attenuation rate in water. Howev er\, the amplitude and phase of an acoustic wave is distorted by volume sou nd speed inhomogeneities along the transmission path as well as through mul tipath interaction with the ocean surface and bottom. This distortion affe cts one's ability to properly interpret the received information for the pu rpose of detection\, localization and tracking of acoustic sources. A sign ificant cause of acoustic field distortion along the earth's continental sh elfs are non-linear solitary waves\, primarily generated by ocean tides. T his seminar will discuss some of the effects of these wave-wave interaction s\, and how they can be modeled and simulated in the presence of incomplete environmental knowledge about the ocean environment. LAST-MODIFIED:20230127T203126Z LOCATION:8050 Greenmead Drive College Park\, MD 20740 301-935-6400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081203T210000Z DTEND:20081203T220000Z DTSTAMP:20260828T094430Z UID:lm5a0954elp60cnkap1k3blhv0@google.com CREATED:20081201T162549Z DESCRIPTION:Title: Hard Jets as Probes of Dense Soft Matter and Possible N ew Effective Theory\nSpeaker: Abhijit Majumder\, Ohio State University LAST-MODIFIED:20230127T203403Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN/ENP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081106T170000Z DTEND:20081106T180000Z DTSTAMP:20260828T094430Z UID:h7kmi2jogrkv8mqffqdfc7s52c@google.com CREATED:20081103T190614Z DESCRIPTION:Title: "Black hole-neutron star binaries in numerical relativit y"\nSpeaker: Matt Duez\, Cornell University LAST-MODIFIED:20230127T203537Z LOCATION:CSIS Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090422T200000Z DTEND:20090422T213000Z DTSTAMP:20260828T094430Z UID:uckhdmvu8u0ll7b3salnqg16fs@google.com CREATED:20090417T183557Z DESCRIPTION:Title: "High Energy Emission from Gamma Ray Bursts"\nSpeaker: D r. Soebur Razzaque\, Naval Research Laboratory LAST-MODIFIED:20230127T203109Z LOCATION:Physics Building\, Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090218T200000Z DTEND:20090218T210000Z DTSTAMP:20260828T094430Z UID:eohgdra4ds7dvsg9bs9gmviovk@google.com CREATED:20090204T161359Z DESCRIPTION:Speaker: Gennady Shvets\, University of Texas at Austin\nTitl e: Negative Index Metamaterials and Sub-diffraction Imaging LAST-MODIFIED:20230127T203446Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100824T180000Z DTEND:20100824T190000Z DTSTAMP:20260828T094430Z UID:76pg4j6iknb5q5mf3a7mmg1kgo@google.com CREATED:20100817T141920Z DESCRIPTION:[Title] "A new concept in long baseline neutrino oscillation ex periments"\n[Speaker] Dr. Sanjib Kumar Agarwalla\n[Institution] Virginia Te ch\n[Abstract] We study the possibility to replace the anti-neutrino run of a long baseline neutrino oscillation experiment\, with anti-neutrinos fr om muon decay at rest. The low energy of these neutrinos allows the use of inverse beta decay for detection in a Gadolinium-doped water Cerenkov detec tor. We show that this approach yields a factor of five times larger anti-n eutrino event sample. The resulting discovery reaches in $\\theta_{13}$\, t he mass hierarchy and leptonic CP violation are compared with those from a conventional superbeam experiment with combined neutrino and anti-neutrino running. We find that this approach yields a greatly improved reach for CP violation and $\\theta_{13}$ while leaving the ability to measure the mass hierarchy intact.\n\n LAST-MODIFIED:20230127T203524Z LOCATION:Room 4102\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120424T150000Z DTEND:20120424T160000Z DTSTAMP:20260828T094430Z UID:ocbaek798gtlq07p0skmn8sks4@google.com CREATED:20120130T202529Z DESCRIPTION:Title: "Improving the precision of high energy simulation and a nalysis tools"\nSpeaker: Bryan Webber\nInstitution: University of Cambridge LAST-MODIFIED:20230127T203710Z LOCATION:Bloomberg 447\, Johns Hopkins University SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar Joint with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101214T160000Z DTEND:20101214T173000Z DTSTAMP:20260828T094430Z UID:fnt0bjvr9ah6kpuh117tftvlr8@google.com CREATED:20101112T154300Z DESCRIPTION:Title : Phase transition in long range quantum Ising model simu lated with trapped ions\nSpeaker Name: Rajibul Islam\nSpeaker Institution : University of Maryland\nNotes: http://www.physics.umd.edu/cmtc/seminars.ht ml\n LAST-MODIFIED:20230127T203809Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081114T180000Z DTEND:20081114T190000Z DTSTAMP:20260828T094430Z UID:rdala5kfi0na21jdqgo7stha8s@google.com CREATED:20081024T185909Z DESCRIPTION:Title: Quantitative Nanoscale Imaging of Biological Structures in the Electron Microscope\nSpeaker: Dr. Richard Leapman\, National Institu te of Biomedical Imaging and Bioengineering\, NIH\nMore Information: amateu s@umd.edu/55207 LAST-MODIFIED:20230127T203804Z LOCATION:Chemical and Nuclear Engineering Bldg.\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100211T171500Z DTEND:20100211T181500Z DTSTAMP:20260828T094430Z UID:20v1iecremcnqhopvskj6j0ahc@google.com CREATED:20100125T155532Z DESCRIPTION:Seminar title --- "Reactive Wetting"\nSpeaker Name --- Dan Whee ler\nSpeaker Affiliation --- NIST and IREAP UMD\n LAST-MODIFIED:20230127T203716Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081114T180000Z DTEND:20081114T223000Z DTSTAMP:20260828T094430Z UID:khair3ji7jkh9vnl91riersb20@google.com CREATED:20081027T155417Z DESCRIPTION:Speaker: Wim van Saarloos\, J.M. Burgerscentrum\, Leiden Univer sity\; Eitan Tadmor\, University of Maryland\; Elaine Oran\, Naval Research Laboratory\; José M. Ortiz de Zárate\, Complutense University\, Madrid LAST-MODIFIED:20230127T202937Z LOCATION:Jeong H. Kim Engineering Building\, Rooms 1107 and 1111 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Burgers Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130906T150000Z DTEND:20130906T160000Z DTSTAMP:20260828T094430Z UID:blnlsor9bc8pgf0jna5t5ssgoo@google.com CREATED:20130830T210622Z DESCRIPTION:Speaker Name: Jason Alicea\nSpeaker Institution : CalTech\nTitl e: Engineering a universal decoherence-free quantum computer\nAbstract : T he realization of a quantum computer poses a grand outstanding challenge th at promises technological advances in areas ranging from cryptography to qu antum simulation and beyond. Typically decoherence--whereby environmental perturbations corrupt quantum information--presents the chief obstacle. To pological quantum computation\, however\, cleverly sidesteps decoherence at the hardware level by non-locally manipulating quantum information using e mergent particles known as non-Abelian anyons. Considerable progress has r ecently been made towards stabilizing the simplest non-Abelian anyons (part icles binding Majorana zero-modes) by judiciously combining well-understood materials. This ‘engineering’ approach has inspired a wave of experiments \, though such Majorana-based platforms require unprotected gates to run ge neral quantum computing algorithms\, thus entailing significant overhead. A natural question therefore arises: can one combine ordinary ingredients t o s ynthesize a fully fault-tolerant\, universal quantum computer? I will answer this question in the affirmative. More precisely\, I will describe how one can combine simple fractional quantum Hall states and conventional superconductors to realize a novel superconducting phase that harbors so-c alled Fibonacci anyons. These particles constitute the ‘holy grail’ for to pological quantum computing in that they allow for computational universali ty via a single elementary gate generated by braiding the anyons around eac h other. LAST-MODIFIED:20230127T203900Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100506T183000Z DTEND:20100506T193000Z DTSTAMP:20260828T094430Z UID:o87seud6qgeur8f52cure9vkbk@google.com CREATED:20100329T190723Z DESCRIPTION:[Speaker] Patrick Peter\n[Institution] Institut d'Astrophysique de Paris\n[Title] Bouncing alternatives to inflation\n[Abstract] Although inflation is\, by far\, the best known mechanism to explain the observed pr operties of our Universe\, there is still some room for alternative models\ , most of which implying a contracting phase preceeding the current expandi ng one. Both phases are connected by a bounce at which the expansion rate m ust vanish. General relativity can only produce such a phase provided the s patial curvature is positive\, in contradiction with the current observatio ns. I will discuss the lines along which one can modify either the matter o r the gravity sector (or both) in order to implement a bounce\, and show th e generic observable cosmological consequences it can induce\, in particula r in the microwave background. LAST-MODIFIED:20230127T203154Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100916T161500Z DTEND:20100916T171500Z DTSTAMP:20260828T094430Z UID:l1mjaf2b3i7eltt5daf0m787v4@google.com CREATED:20100910T190947Z DESCRIPTION:Speaker: Dr. Mitch Mailman Brandeis University Department of Ph ysics\nTitle: Evidence for a Diverging Length Scale in Granular Packings \n at the Onset of Unjamming LAST-MODIFIED:20230127T203533Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221201T200000Z DTEND:20221201T210000Z DTSTAMP:20260828T094430Z UID:1n1obharc7vas9e36tjj5r02mp@google.com CREATED:20221114T185315Z DESCRIPTION:Title:  Grant Writing 2/2 (Research Grants)
    Speaker:  Mohamm ad Hafezi (QuICS)
    Time:  Thursday\, December 1\, 2022 - 3:00pm
    Locati on:  PSC 3150 and Virtual Via Zoom: https: //umd.zoom.us/j/5942646305

    How to write successful grant proposa ls\, pushing your writing skills to the next level. Mohammad will provide a general overview of grant writing and focus on proposals for research\, a key mandate of the NSF grant for the Quantum Leap Challenge Institute for R obust Quantum Simulation.

    Please prepare your questions in advance a nd send them to rq s-seed@umiacs.umd.edu. LAST-MODIFIED:20221114T185315Z LOCATION:PSC 3150 and Virtual Via Zoom: https://umd.zoom.us/j/5942646305 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Workshop: Mohammad Hafezi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121106T210000Z DTEND:20121106T220000Z DTSTAMP:20260828T094430Z UID:dl5d2njo5qco682m0u66erk6gk@google.com CREATED:20121031T152236Z DESCRIPTION:Speaker\; Janè Kondev\, Brandeis University\n\nTitle: Physical Nature of Bacterial Decision Making\n\nAbstract: Cells make decisions all t he time about what to eat\, where to go\, and what to become. At the heart of cellular decision making is gene regulation\, the process by which cell s turn their genes on and off in response to environmental ques. Experiment s have recently begun to probe gene regulation inside cells at the single m olecule level\, revealing the physical nature of this key biological proces s in quantitative detail. In this talk I will \nreview these experimental a dvances in single-cell gene expression measurements and the theoretical mod els that are being put forth to greet them. I will emphasize the interplay of theory and experiments and how it has revealed interesting surprises abo ut some of the best studied models of gene regulation in bacteria such as t he lac operon. LAST-MODIFIED:20230127T203618Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100920T200000Z DTEND:20100920T210000Z DTSTAMP:20260828T094430Z UID:vm2i3tdhg4kvjj85gf22q85d04@google.com CREATED:20100913T132559Z DESCRIPTION:Speaker: Dirk Gillespie\, Rush Medical College\n \nTitle: "I on charge versus ion size in biological\n calcium channels: Ho w the close-range\n electrostatics of crowded ions makes the\n protein structure almost irrelevant". LAST-MODIFIED:20230127T203010Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221006T150000Z DTEND:20221006T160000Z DTSTAMP:20260828T094430Z UID:4ehrec37pv328pqce9h57ug4p3@google.com CREATED:20220804T154354Z DESCRIPTION:Literature Seminar

    Speaker: Prahadeesh Nagaretnam\, UMCP

    Title: \;Fe–Catalyzed Radical Aromatic C-H Amination


    Abs tract: \;https://chem.umd.edu/events/fe-catalyzed-radical-aromatic-c-h-ami nation LAST-MODIFIED:20221004T143003Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090309T203000Z DTEND:20090309T213000Z DTSTAMP:20260828T094430Z UID:cqucg1p3djhl14fs6574scrf90@google.com CREATED:20090309T142233Z DESCRIPTION:Title: New TeV Gamma Sources and a Surprising Cosmic Ray Anisot ropy - Recent Results from Milagro\nSpeaker: Jordan Goodman\, University of Maryland LAST-MODIFIED:20230127T203850Z LOCATION:CSS Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110211T180000Z DTEND:20110211T190000Z DTSTAMP:20260828T094430Z UID:da0qr0uvd0g5q8v68kbmi960kk@google.com CREATED:20110126T192152Z DESCRIPTION:Title : Materials Science Seminar: Dealloyed Nanoporous Metals: A Tortured Path from Ancient Material to High-Performance Fuel Cell Electr ocatalyst\nSpeaker Name: Jonah Erlebacher\nSpeaker Institution : Johns Hopk ins University\nAbstract : Nanoporous metals\, with pore and ligament sizes of nearly atomic scale\, can be formed by the selective dissolution of a c omponent(s) from a binary or even multicomponent alloy. This process\, know n as dealloying\, has a long history stretching back to the ancient America s where copper/gold artifacts were surface enriched in gold via chemical de alloying in some sort of mineral salt coating. The history passes through t he problem of dezincification of brasses identified in the Civil War period and through the fundamental physics of element mixing in alloys in the 20t h century\; indeed\, dealloying remains a major problem in corrosion today. In this talk\, I will first discuss the recent trends that see dealloying not as a corrosion problem\, but as a new fabrication tool to make nanostru ctured porous materials with a wide variety of compositional and structural architectures. As such\, nanoporous metals are finding applications in (bi o)sensing\, micromechanics\, and catalysis. This last application is of par ticular interest to me. We have recently used what we’ve learned in dealloy ing and porosity evolution to develop a new class of highly effective catal ysts for the oxygen reduction reaction (ORR)\, the primary bottleneck in fu el cell catalysis. The ORR accounts for approximately 80% of the losses in proton exchange membrane fuel cells due to the slow kinetics of a complex r eaction involving oxygen\, four protons\, and four electrons. Our catalysts are based on a nanoporous NiPt material that is impregnated with a hydroph obic\, protic ionic liquid that chemically and geometrically confines oxyge n to chemically reactive pore surfaces\, and expels water from them. These effects bias the reaction toward completion. With our composite catalyst we have attained mass activities nearly an order of magnitude higher than tha t of typical carbon-support platinum nanoparticles\, and this innovation al lows us to take advantage of the high intrinsic catalytic act. LAST-MODIFIED:20230127T203304Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120326T233000Z DTEND:20120327T013000Z DTSTAMP:20260828T094430Z UID:669trqh5pc94ibplhjr4q9bv1g@google.com CREATED:20120314T143033Z DESCRIPTION:Speaker: Dr. Lawrence Krauss \nInstitution: Arizona State Unive rsity\nTitle: "A Universe From Nothing"\nHe will be speaking about his new book\, "A Universe From Nothing"\nHost: the Society of Inquiry\, and the Sc holars SDU program LAST-MODIFIED:20230127T203723Z LOCATION:1101 Biosciences Research Building (BRB) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Lecture by Lawrence Krauss TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110719T150000Z DTEND:20110719T160000Z DTSTAMP:20260828T094430Z UID:drr6m4o41vpe396i3gafg2qla4@google.com CREATED:20110713T132100Z DESCRIPTION:Title : Interpreting Spin-Seebeck Effect Measurements\nSpeaker Name: Matthew Sears\nSpeaker Institution : Texas A&M University\nNotes: For all talk see:http://www.physics.umd.edu/cmtc/seminars.html\nAbstract : Rec ent experiments seem to observe the spin-Seebeck effect\, which is the prod uction of a spin-current by a thermal gradient. A thermal gradient and a u niform magnetic field are applied across the length (x) of a thin-film ferr omagnet grown on top of an insulating substrate. From a voltage measuremen t across the width (y) of the ferromagnetic film\, a spin current is inferr ed to occur along the thickness (z) via the Inverse Spin Hall Effect. Some experiments show that this voltage (and thus the spin current) varies as S inh(x/\\lambda)\, where \\lambda is much greater than a spin diffusion leng th. With heat currents carried by both phonons and magnons in the ferromag net\, this length may be due to magnon-phonon equilibration. Using the mac roscopic equations of irreversible thermodynamics\, we show that\, with bot h magnon-phonon equilibration in the sample and phonon-phonon equilibration between the sample and the substrate\, thermal gradients along z vary as S inh(x/\\lambda). The thermal gradient along z yields a spin current along z (the spin-Seebeck effect)\, which in turn leads to a voltage gradient alo ng y via the Spin Hall conductivity. LAST-MODIFIED:20230127T203017Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101020T183000Z DTEND:20101020T200000Z DTSTAMP:20260828T094430Z UID:u98m5k97pl99mpfbgo5anh2ejk@google.com CREATED:20100914T163317Z DESCRIPTION:SPEAKER: Sanjay Reddy\nAFFILIATION: Los Alamos National Lab\, NM\nTITLE: The Condensed Matter Physics of the Neutron Star Crust: How to Discover an Extraterrestrial Superfluid \nABSTRACT: ABSTRACT: The outer 1 -2 km region of the neutron star\, called the crust\, is an exotic (super)s olid with interesting structural and transport properties. Recent phenomen a on accreting and magnetized neutron stars appear to be especially sensiti ve to the low energy properties of the crust. I will describe the basic nuc lear and condensed matter physics of the crust and highlight recent work to develop an effective field theory to describe its low energy properties. I will also describe how we can use observations of thermal relaxation in ac creting neutron stars\, superbursts and giant\nflares on magnetars to unrav el the properties and composition of the neutron star crust. \n LAST-MODIFIED:20230127T203237Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100209T160000 DTEND;TZID=America/New_York:20100209T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100209T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Dr. Micheal Salamon\, NASA\nTitle: "Dark Energy at NAS A" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221031T190000Z DTEND:20221031T203000Z DTSTAMP:20260828T094430Z UID:7mf5m1cnm7nkf5sl688qm552e8@google.com CREATED:20220816T142216Z DESCRIPTION:Speaker: Lingfeng Li\, Brown U


    Title:&nbs p\;Jupiter missions as probes of dark matter

    Abstract: Jupiter\, the fascinating largest planet in the solar system\, has been visited by nine spacecraft\, which have collected a significant amount of data about Jovian properties. In this paper\, we show that one type of the \\textit{in situ} measurements on the relativistic electron fluxes could be used to probe da rk matter (DM) and dark mediator between the dark sector and our visible wo rld. Jupiter\, with its immense weight and cool core\, could be an ideal ca pturer for DM with masses around the GeV scale. The captured DM particles c ould annihilate into long-lived dark mediators such as dark photons\, which subsequently decay into electrons and positrons outside Jupiter. The charg ed particles\, trapped by the Jovian magnetic field\, have been measured in Jupiter missions such as the Galileo probe and the Juno orbiter. We use th e data available to set upper bounds on the cross section of DM scattering off nucleons\, $\\sigma_{\\chi n}$\, for dark mediators with lifetime of or der ${\\cal O}(0.1-1)$s. The results show that data from Jupiter missions a lready probe regions in the parameter space un- or under-explored by existi ng DM searches\, \\textit{e.g.}\, constrain $\\sigma_{\\chi n}$ of order $( 10^{-41} - 10^{-39})$ cm$^2$ for 1 GeV DM dominantly annihilating into $e^+ e^-$ through dark mediators. \; This study serves as an example and an initial step to explore the full physics potential of the large planetary d atasets from Jupiter missions. We also outline several other potential dire ctions related to secondary products of electrons\, positron signals and so lar axions.     LAST-MODIFIED:20221028T154703Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100913T203000Z DTEND:20100913T213000Z DTSTAMP:20260828T094430Z UID:fkop7721tigolp22jnaspf7fs4@google.com CREATED:20100909T171404Z DESCRIPTION:Title : The Dynamic Connection Between the Sun and Heliosphere\ nSpeaker Name: Spiro Antiochos\nSpeaker Institution : Goddard Space Flight Center\nAbstract : Since the pioneering theoretical work of Parker in 1958\ , later confirmed by satellite observations in the heliosphere\, it has bee n known that the Sun's atmosphere streams continuously outward in the form of a supersonic wind. At a basic level the origin of the wind is straightfo rward: the difference in gas pressure between the Sun's million-degree coro na and the tenuous interstellar plasma causes the corona to expand outward. The Sun's intense magnetic field\, however\, adds both structure and dynam ics to this simple picture. The field divides the corona into regions that are "open" (i.e.\, connect to the heliosphere and "closed" (confined to the Sun). Furthermore\, the field structures the heliosphere into quasi-steady "fast" wind and fully dynamic "slow" wind. The fast wind has been clearly observed to originate in open coronal regions\, but the source of the slow wind has long been one of the major problems in solar/heliospheric physics. I will present an overview of\n\n our present state of knowledge of the co rona and wind\, and then discuss a new theory\, the S-Web model\, that may explain the slow wind.\n LAST-MODIFIED:20230127T203640Z LOCATION: CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091120T180000Z DTEND:20091120T190000Z DTSTAMP:20260828T094430Z UID:215hnbcoc5cmrurgd5rmskvusg@google.com CREATED:20091113T162158Z DESCRIPTION:Title: Functional Nanoparticle Assemblies Based on Layer-by-Lay er Assembly and Microfluidics\n\nSpeaker: Daeyeon Lee\nProfessor\, Departme nt of Chemical and Biomolecular Engineering\nUniversity of Pennsylvania\n\n Abstract: Recent advances in materials chemistry have enabled the synthesis of nanoparticles with useful optical\, catalytic\, and magnetic properties . Assembly of these nanoparticles into functional structures\, with precise control over their properties\, would lead to great advances. However\, it still remains a great challenge to achieve this goal through simple means. This presentation will discuss two methods – layer-by-layer (LbL) assembly and microfluidics – that have been utilized for the fabrication of functio nal thin films and microcapsules. In the first part of the talk\, I will de scribe our work on the layer-by-layer assembly of all-nanoparticle thin fil ms that exhibit antireflection\, antifogging (superhydrophilicity)\, and se lf-cleaning properties. In addition\, the importance of assembly condition for all-nanoparticle thin films based on electrostatic interactions will be discussed. In the second part of the talk\, our recent efforts to generate semi-permeable microcapsules known as colloidosomes will be described. Mon odisperse water-in-oil-in-water (W/O/W) double emulsions with a core-shell geometry are generated using glass capillary microfluidic devices. These do uble emulsions\, in turn\, are utilized as templates for fabrication of sop histicated new structures including colloidosomes. LAST-MODIFIED:20230127T203342Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130520T163000Z DTEND:20130520T173000Z DTSTAMP:20260828T094430Z UID:oavp5t2359oddhk19ss3ffjd68@google.com CREATED:20130508T134403Z DESCRIPTION:Speaker: Na Young Kim\nTitle: Microcavity Exciton-Polariton C ondensates: physics and application\nAbstract: Microcavity exciton-polarito ns are hybrid light-matter quasi-particles arising from the mixed states be tween cavity photons and quantum well excitons. The inherent light-matter d uality provides experimental advantages: the stimulated scattering among in teracting particles and the small effective mass (~ 10-8 times the hydrogen atom) form coherent condensate states at high temperatures (e.g. 4 K in Ga As and room temperature in GaN materials). In addition\, the dynamics of ex citon-polaritons is accessed by capturing the leaked photons out of the cav ity due to the short lifetime. I will first discuss the fundamental propert ies of non-equilibrium exciton-polariton condensates with emphasis of open- dissipative nature. As engineering applications\, I will present the establ ishment of exciton-polariton quantum emulators\, which may serve as a solid -state platform to investigate strongly correlated materials. And I will sh ow our recent progress of an electrically pumped exciton-polariton device\, towards the development of novel coherent light sources operating at low t hreshold powers. LAST-MODIFIED:20230127T203332Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Na Young Kim TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111013T173000Z DTEND:20111013T180000Z DTSTAMP:20260828T094430Z UID:6cf0in44jrckiat2p5ke73oot4@google.com CREATED:20110914T204206Z LAST-MODIFIED:20230127T203041Z LOCATION:Rm. 1305\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130506T163000Z DTEND:20130506T173000Z DTSTAMP:20260828T094430Z UID:6ubb9676aqk90as1rfm1iu65m4@google.com CREATED:20130425T175346Z DESCRIPTION:Title: Recent Progress in Optical Magnetometry and Applications \nSpeaker: Dmitry Budker\, University of California at Berkeley\nAbstract: I will give an overview of what's been going on in the rejuvinated field o f optical magnetometry with alkali atoms and diamond\, and describe some of the resent applications\, including nuclear magnetic resonance without mag nets. Much more on the topic and our group's full bibliography can be found on http://budker.berkeley.edu\n LAST-MODIFIED:20230127T203829Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Dmitry Budker TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221110T160000Z DTEND:20221110T170000Z DTSTAMP:20260828T094430Z UID:0kdrbm6bnjf7up4bstbqmr79u9@google.com CREATED:20220804T155255Z DESCRIPTION:Literature Seminar

    Speaker: Jou-Tsen (Olie) O u

    Title: \;    Self-Assembly Behaviors of Giant Molecule s Made from Molecular Nanoatoms

    Abstract: \;https://chem.umd.edu/events/self-assembly-behaviors-giant-mo lecules-made-molecular-nanoatoms LAST-MODIFIED:20221102T143054Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221010T190000Z DTEND:20221010T203000Z DTSTAMP:20260828T094430Z UID:1aohbmoclhhq8o2mrg7v0s0cef@google.com CREATED:20220824T194059Z DESCRIPTION:Speaker: Fengwei Yang\, University of Utah

    Title: Searching for Dark Photon Dark Matter with Gravitational Wave D ata

    Abstract: Traditionally\, Dark Matter (DM) searches are dominant ly focused on GeV – TeV mass
    window. However\, though these experiments have reached unprecedented detection sensitivities\,
    the successes only resulted in a push for stronger limits on parameters. This forces people to keep
    their minds open to other DM candidates\, especially in the differ ent mass regimes. If a DM
    particle is an ultralight gauge boson\, i.e. d ark photon\, DM should be considered as a background
    field. With certain assumptions on its coupling to Standard Model particles\, this DM backgrou nd
    field could exert forces on test masses in gravitational wave detecto rs\, resulting in displacements
    with a characteristic frequency set by t he gauge boson mass. In this talk\, I will discuss a novel
    strategy to h unt for such DM. I will also give more details about DM background simulati on\, the
    properties of the DPDM signal\, and the analysis method. We per formed the first proof-of-concept
    search using LIGO O1 data. Furthermore \, the LIGO-Virgo-KAGRA collaboration adopted our
    analysis method for th e O3 data analysis. Large unexplored parameter space can be probed based
    on this method.
     LAST-MODIFIED:20221005T193214Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100928T171500Z DTEND:20100928T184500Z DTSTAMP:20260828T094430Z UID:bt3f6cj9cfsuilfubhgohkktvk@google.com CREATED:20100920T130941Z DESCRIPTION:Title : Anderson Localization for the Nonlinear Schroedinger Eq uation: Numerical Results and Asymptotic\nSpeaker Name: Professor Shmuel Fi shman\nSpeaker Institution : Technion\, Haifa\, Israel\nNotes: As in the pa st\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 above five minutes after 12:00 ( Noon). LAST-MODIFIED:20230127T203117Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130923T150000Z DTEND:20130923T160000Z DTSTAMP:20260828T094430Z UID:6qujrnvs9f6nd7plcd5haavoe8@google.com CREATED:20130827T160521Z DESCRIPTION:Prange Technical Lecture: “Quantum Field Theory: Past\, Present \, Future”\nSpeaker Name: David Gross\nSpeaker Institution : KITP\; UCSB LAST-MODIFIED:20230127T203735Z LOCATION:CSS Room 2324 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Special JQI Seminar/CMTC Prange Lecture TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20081001T200000Z DTEND:20081001T210000Z DTSTAMP:20260828T094430Z UID:s1vohheq5hel0vm5fmr3u62cuk@google.com CREATED:20080912T170712Z DESCRIPTION:Speaker: Dr. Phillip Sprangle\, Plasma Physics Division\, Naval Research Laboratory\nTitle:"Laser-Pumped X-ray Free Electron Laser"\nMore Information: http://www.glue.umd.edu/~swisdak/PPS/Sprangle.html\nContact Dr . Marc Swisdak\n(See swisdak@umd.edu)\nWeb site: http://www.glue.umd.edu/~s wisdak/PPS/plasma_seminar.html\n\n LAST-MODIFIED:20230127T203341Z LOCATION:Energy Research Facility (Bldg. #223)\, Room: 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100223T160000 DTEND;TZID=America/New_York:20100223T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100223T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Dr. Ken Zweibel\, Director\, GW Solar Institute\, Geo rge Washington University\nTitle: "The Economics of Photovoltaic Device Tec hnologies"\nAbstract:Ken Zweibel has almost 30 years experience in solar ph otovoltaics.\nDuring his 26 years at the National renewable Energy Lab (NRE L)\,\nZweibel led their development of thin film PV\, serving as program\nl eader for the Thin Film PV Partnership Program until 2006. The Thin\nFilm P artnership worked with most U.S. stakeholders in thin film PV\n(companies\, universities\, scientists) and is often credited with being\nimportant to the success of thin film PV in the U.S. Zweibel\nsubsequently cofounded and became Chairman and President of a thin\nfilm CdTe PV start-up\, PrimeStar Solar\, a majority of which has been\npurchased by General Electric. Zweib el authored the “Solar Grand\nPlan\,” an article appearing in Scientific Am erican (January 2008).\n\nSince July 2008\, Zweibel has been Director of th e Solar Institute at\nThe George Washington University in Washington\, D.C. The Institute\nconducts research into the economic\, technical\, and publi c policy\nissues associated with the development and deployment of solar en ergy\nto meet global energy and environmental challenges. Zweibel has been\ non the Steering Committee of the “DOE Solar Vision” since June 2009\,\nwhe n it began an effort to develop a deployment plan for solar through\n2030. Zweibel also keeps an active blog on solar energy\,\nhttp://thesolarreview. org/.\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081010T180000Z DTEND:20081010T190000Z DTSTAMP:20260828T094430Z UID:rr04b4g0uj04bnsuvcfm1h9rec@google.com CREATED:20081008T172446Z DESCRIPTION:Title: "Experimental and Theoretical Analyses of Signal Propaga tion in Neural Networks"\nSpeaker: Dr. Alex Reyes\, Associate Professor\, N ew York University LAST-MODIFIED:20230127T203822Z LOCATION:Jeong H. Kim Engineering Building\, Rm. 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Booz Allen Hamilton Distinguished Colloquium in Electrical and Comp uter Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100208T210000Z DTEND:20100208T223000Z DTSTAMP:20260828T094430Z UID:ui9847kvt79kd7qv8410a5bv60@google.com CREATED:20100201T151306Z DESCRIPTION:Title : How Flexible are Proteins and Solution (And Why Do We C are)?\nSpeaker Name: Professor David A. Case\nSpeaker Institution : BioMaPS Institute and the Department of Chemistry & Biology\, Rutgers University\n Notes: Refreshments at 3:45PM\n LAST-MODIFIED:20230127T203034Z LOCATION:Room 1116\, IPST Bldg. Bldg. #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090415T170000Z DTEND:20090415T190000Z DTSTAMP:20260828T094430Z UID:1mmru5359b9hk717o89d6vghn8@google.com CREATED:20090323T150630Z DESCRIPTION:Title: Various Topics in AdS/CFT\nSpeaker: Bo-Wen Xiao\, Lawren ce Berkeley National Lab\, Berkeley CA\nMore Information: Abstract: In th is talk\, I would like to start with the introduction to the AdS/CFT corres pondence\, and then briefly talk about its application to RHIC physics (ene rgy loss and momentum broadening calculation). Then\, the exact acceleratin g string solution of a heavy quark-antiquark pair in $AdS_5$ vacuum space a s well as its connection with the well-known Unruh temperature is discussed . The energy loss\, momentum-broadening of the heavy quark due to accelerat ion are also computed using the AdS/CFT correspondence. In the end\, I will show some recent work in calculating various structure functions in AdS/QC D model. LAST-MODIFIED:20230127T203502Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131007T203000Z DTEND:20131007T213000Z DTSTAMP:20260828T094430Z UID:0jincta1uo9082781mvk3jfkfo@google.com CREATED:20130916T194049Z DESCRIPTION:Title : The Mysterious sources of Ultrahigh Energy Cosmic Rays\ nSpeaker Name: Ke Fang\nSpeaker Institution : University of Chicago\nNotes: Coffee\, Tea & Cookies 4:15-4:30 PM\nAbstract : The workings of the most e nergetic astrophysical accelerators in the Universe are encoded in the orig in of ultrahigh energy cosmic rays (UHECRs). Current observations by the Au ger Observatory\, the largest UHECR observatory\, show a spectrum that agre es with an extragalactic origin\, as well as an interesting transition in c hemical composition from light element to heavier element as energy increas es. Candidate sources range from young neutron stars to gamma-ray bursts an d events in active galaxies. In this talk\, we will discuss newborn pulsars as the sources of ultrahigh energy cosmic rays. We will show that a newbor n pulsar model naturally injects heavier elements and can fit the observed spectrum once propagation in the supernova remnant is taken into account. W ith the proper injection abundances\, integrated cosmic rays from the extra galactic pulsar population can match observation in all aspects - energy sp ectrum\, chemical composition\, and anisotropy. We will also\n examine the fingerprints of their Galactic counterparts on cosmic ray spectrum . Lastl y\, we will discuss the multi-messenger smoking gun of this scenario - the detectability of high energy neutrinos from pulsars and magnetars. \n LAST-MODIFIED:20230127T203300Z LOCATION:CSS 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110308T210000Z DTEND:20110308T220000Z DTSTAMP:20260828T094430Z UID:v78t6dni9hofvd1utr2ghhml0k@google.com CREATED:20110302T182725Z DESCRIPTION:Speaker: Nathaniel Fisch\, Princeton University\nTitle: What i s a Plasma Wave?\nAbstract: And what are some useful things that it can be used for? This talk will explore how the simplest of waves in plasma can b e used\, among other things\, to drive mega-amps of current\, to divert meg a-watts of power\, or to mediate the next generation of laser intensities. LAST-MODIFIED:20230127T203328Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131106T190000Z DTEND:20131106T203000Z DTSTAMP:20260828T094430Z UID:lp7u5ndhepnb28hr4rmf9vfstg@google.com CREATED:20131101T153413Z DESCRIPTION:Title : "First Dark Matter Search Results from LUX"\n\nSpeaker Name: Carter Hall\n\nSpeaker Institution : University of Maryland\n\nAbstra ct : We report on the first WIMP search results from the LUX dark matter ex periment\, a two-phase liquid xenon TPC currently in operation at the Sanfo rd Lab in Lead\, South Dakota.\n LAST-MODIFIED:20230127T202951Z LOCATION:Physics 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T180000Z DTEND:20221109T185000Z DTSTAMP:20260828T094430Z UID:779nl9h64hajv4154fa1ksm915@google.com CREATED:20221104T180933Z DESCRIPTION:Title:  Quantum Money with Minimal Quantum
    Speaker:  Joseph Carolan (QuICS)
    Time:  Wednesday\, November 9\, 2022 - 1:00pm
    Locatio n:  ATL 3100A and Virtual Via Zoom: https ://umd.zoom.us/j/96508005344

    Quantum money leverages the fundame ntal uncloneability of quantum information to create a money system in whic h copying money is computationally infeasible\, yet verifying it is efficie nt. However\, in addition to fault tolerant quantum computers\, many quantu m money schemes also require quantum communication. I will discuss the poss ibility of schemes with classical communication in place of quantum. In par ticular\, I will focus on the private key semi-quantum money of Radian et a l\, placing it in context with other types of dequantization we could hope for.

    Reference: R. Radian\, O. Sattath\, “Semi-quantum money\,” https://arxiv.org/abs/1908.08889 (2019) LAST-MODIFIED:20221104T180933Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Joseph Carolan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090917T180000Z DTEND:20090917T193000Z DTSTAMP:20260828T094430Z UID:1nm3o1j71v14jo52ru5o71759k@google.com CREATED:20090914T141046Z DESCRIPTION:Title : Quantum Spin Hall Effect and Topological Insulators\nSp eaker Name: Professor Shoucheng Zhang\nSpeaker Institution : Stanford Unive rsity\nAbstract : Recently\, a new class of topological states has been pro posed and\nexperimentally realized. These topological insulators have an in sulating gap\nin the bulk\, but have topologically protected edge or surfac e states due to\nthe time reversal symmetry. In two dimensions the edge sta tes give rise to\nthe quantum spin Hall (QSH) effect\, in the absence of an y external\nmagnetic field. I shall review the theoretical prediction [1] o f the QSH state\nin HgTe/CdTe semiconductor quantum wells\, and its recent experimental\nobservation [2]. The edge states of the QSH state supports fr actionally\ncharged excitations [3]. The QSH effect can be generalized to t hree\ndimensions as the topological magneto-electric effect (TME) of the\nt opological insulators [4]. Bi2Te3\, Bi2Se3 and Sb2Te3 are theoretically\npr edicted to be topological insulators with a single Dirac cone on the\nsurfa ce [5]. I shall present a realistic experimental proposals to observe the\n magnetic monopoles on the surface of topological insulators [6].\n[1] A. Be rnevig\, T. Hughes and S. C. Zhang\, Science\, 314\, 1757\, (2006)\n[2] M. Koenig et al\, Science 318\, 766\, (2007)\n[3] J. Maciejko\, Chaoxing Liu\, Yuval Oreg\, Xiao-Liang Qi\, Congjun Wu\, and Shou-\nCheng Zhang\, Phys. R ev. Lett. V102\, 256803 (2009).\n[4] Xiao-Liang Qi\, Taylor Hughes and Shou -Cheng Zhang\, Phys. Rev B. 78\, 195424\n(2008)\n[5] Haijun Zhang\, Chao-Xi ng Liu\, Xiao-Liang Qi\, Xi Dai\, Zhong Fang\, and Shou-Cheng\nZhang\, Natu re Physics 5\, 438 (2009).\n[6] Xiao-Liang Qi\, Run-Dong Li\, Jiadong Zang and Shou-Cheng Zhang\, Science 323\,\n1184 (2009). LAST-MODIFIED:20230127T203902Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090313T173000Z DTEND:20090313T190000Z DTSTAMP:20260828T094430Z UID:3m6pudciq00n4q1rcdmd1iv55o@google.com CREATED:20090306T204419Z DESCRIPTION:Title: NLO calculations and Parton Showers\nSpeaker: Christian Bauer\, LBNL(Lawrence Berkeley National Laboratory)\nMore Information: The abstract: Many inclusive processes relevant for collider physics have by no w been calculated to NLO accuracy. Unfortunately\, fully exclusive event sa mples are required by the experimental collaborations in order to implement experimental cuts and correct the theoretical predictions for detector eff ects. In this talk\, I will describe how to combine NLO calculations with p arton shower algorithms\, and will explain why resummed NLO calculations ar e necessary. I will present results that allow this combination to be perfo rmed without the need for computationally costly numerical integrations. LAST-MODIFIED:20230127T203659Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland Center for Fundamental Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111017T160000Z DTEND:20111017T163000Z DTSTAMP:20260828T094430Z UID:7ebceequd75rk2lg5n4dnqj7ig@google.com CREATED:20111003T132645Z LAST-MODIFIED:20230127T203018Z LOCATION:Physics 1305F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110420T151500 DTEND;TZID=America/New_York:20110420T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110420T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Status of the Search for Gravitational Wave Ringdowns from Perturbed Black Holes"\n[Speaker] Sarah Caudill\n[Institution] Louisi ana State University\n[Abstract] I will report on the status of the search for gravitational wave ringdowns from perturbed black holes with masses bet ween 25-100 M_sun in LIGO's fifth science run. This mass range is the firs t regime explored as part of the ringdown search's participation in the Ins piral-Merger-Ringdown (IMR) project\, a joint effort between LIGO's Burst g roup and Compact Binary Coalescence group to study the efficiency with whic h we will detect high mass binary black holes with masses between 25-500 M_ sun. I will also review the recent changes made to the ringdown analysis p ipeline for LIGO's fifth science run. These changes include the implementat ion of a new 3D coincidence test to compute the distance between pipeline t riggers in frequency\, quality\, and time space as well as a number of impr ovements to increase efficiency and automation in the pipeline. LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101103T183000Z DTEND:20101103T193000Z DTSTAMP:20260828T094430Z UID:brj7nf5q2kmv6j5vgdpmj086gk@google.com CREATED:20101020T180610Z DESCRIPTION:SPEAKER: Stefan Koelling\n\nAFFILIATION: Forschungszentrum Ju elich\, Germany\n\nTITLE: Towards a consistent em.-current operator from c hiral EFT\n\nABSTRACT: In recent years the application of chiral effective field theory (EFT) to the few-nucleon sector has been very successful. Obse rvables at low momentum can be described in a unified framework for the two -\, three- and four-nucleon system with a rather high precision. In this ta lk I show how the framework of\nchiral EFT allows for the consistent inclus ion of electromagnetic effects. I present our results for the one- and two- pion exchange currents at next-to-leading\norder and compare these results to currents obtained by other groups. I conclude by presenting recent resul ts of our numerical analysis of the deuteron form factors. \n\n LAST-MODIFIED:20230127T203259Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130211T210000Z DTEND:20130211T220000Z DTSTAMP:20260828T094430Z UID:0g0fd5o3i9vk39ibno9af6477c@google.com CREATED:20130201T173930Z DESCRIPTION:Speaker: Gabe Aeppli\, London Centre for Nanotechnology\n\nTit le: Orbitronics in Silicon\n\nAbstract: We describe the control and observa tion of coherent superpositions of defect orbitals in silicon using both sc anning tunneling microscopy and pulsed THz radiation generated by the Dutch -UK free electron laser FELIX. The results are contrasted with those for c ontrol of defect spins\, and implications for future silicon-based informat ion processing are outlined.\n\nHost: Rick Greene LAST-MODIFIED:20230127T203442Z LOCATION:Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL CNAM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090206T180000Z DTEND:20090206T190000Z DTSTAMP:20260828T094430Z UID:p06m5504c5slguho0i4h2qre1o@google.com CREATED:20090202T160028Z DESCRIPTION:Title: Architectural Effects in Bimetallic Nanostructures: Pt-R u Bimetallic Catalysts for Fuel Cells and Preferential CO Oxidation Applica tions\nSpeaker: Professor Bryan Eichhorn\, Department of Chemistry\, Univer sity of Maryland LAST-MODIFIED:20230127T203654Z LOCATION:Chemical and Nuclear Engineering Bldg\, Rm. 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120417T160000Z DTEND:20120417T171500Z DTSTAMP:20260828T094430Z UID:fm6rjbdflepi3gkklifeocnlpc@google.com CREATED:20120220T155507Z DESCRIPTION:"How Fusion Can Become Relevant"\nDr. Wallace Manheimer\nNaval Research Laboratory LAST-MODIFIED:20230127T203318Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130218T173000Z DTEND:20130218T183000Z DTSTAMP:20260828T094430Z UID:jdgu8vlea2ilafpl2rboo9un9k@google.com CREATED:20130214T142713Z DESCRIPTION:Title: Topological excitations in normal and superfluid Fermi g ases\n\nAbstract: The coupling of the spin of electrons to their motional s tate lies at the heart of topological phases of matter. We have created and detected spin-orbit coupling in an atomic Fermi gas via spin-injection spe ctroscopy\, which characterizes the energy-momentum dispersion and spin com position of the quantum states. For energies within the spin-orbit gap\, th e system acts as a spin diode. To fully inhibit transport\, we open an addi tional spin gap with radio-frequency coupling\, thereby creating a spin-orb it coupled lattice whose spinful band structure we probe. In the presence o f s-wave interactions\, spin-orbit coupled fermion systems should display i nduced p-wave pairing and consequently topological superfluidity. Such syst ems can be described by a relativistic Dirac theory with a mass term that c an be made to vary spatially.\nLocalized mid-gap states are expected to occ ur whenever the mass term changes sign.\n\nA system that similarly supports such mid-gap states is the strongly interacting atomic Fermi gas near a Fe shbach resonance. Topological excitations\, such as vortices or solitons in a fermionic superfluid represent a defect in the order parameter and give rise to localized bound states. We have created and directly observed solit ons in a fermionic superfluid by imprinting a step in the order parameter. The solitons are found to be stable for many seconds\, allowing us to track their oscillatory motion in the trapped superfluid. Their oscillation peri od increases dramatically as the interactions are tuned from the Bose-Einst ein condensation (BEC) to the Bardeen-Cooper Schrieffer (BCS) superfluidity regime. At the Feshbach resonance\, the measured effective mass of a solit on is about 50 times larger than expectations from mean-field Bogoliubov-de Gennes theory\, signaling strong effects of pair quantum fluctuations and filling of Andreev bound states. In the presence of spin imbalance\, a sing le soliton is one limit of the long-sought Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state.\n LAST-MODIFIED:20230127T203417Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Waseem Bakr TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131121T183000Z DTEND:20131121T190000Z DTSTAMP:20260828T094430Z UID:ojj3lhdp6h53hu302chb0eiusk@google.com CREATED:20131024T155639Z LAST-MODIFIED:20230127T202946Z LOCATION:physics room 1305F\, the "new" Toll room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221102T150000Z DTEND:20221102T160000Z DTSTAMP:20260828T094430Z UID:73e5sdt2hd4e8tt7ol20kn098q@google.com CREATED:20221010T145702Z DESCRIPTION:Title: Topological order from finite-depth circuits and measurements: from theory to quantum devices
    Speaker: Nathanan Tantiva sadakarn (Caltech)
    Time: Wednesday\, November 2\, 2022 - 11:00am
    Loc ation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99762943527?pwd= b0pPOEtBTDBSOCtsZVRab0lDWkxHUT09 Meeting ID: 997 6294 3527 Passcode: 38 3045

    A fundamental distinction between many-body quantum states are those with short- and long-range entanglement (SRE and LRE). The latter\, s uch as cat states\, topological order\, or critical states cannot be create d by finite-depth circuits. Remarkably\, examples are known where LRE is ob tained by performing single-site measurements on SRE states such as prepari ng the toric code from measuring a sublattice of a 2D cluster state. I will present a general framework of how and why these known protocols give rise to long range entanglement based on interpreting the cluster state measure ment as implementing the non-local Kramers-Wannier transformation. This pro vides a scalable and practical way to ``gauge” a symmetry using only finite -depth circuits and measurements\, and moreover allows us to go beyond the preparation of stabilizer states. In addition\, we find a complexity hierar chy on long-range entangled states based on the minimal number of measureme nt layers required to create the state. I will argue that certain phases of matter cannot be prepared using any finite number of layers\, while remark ably certain non-Abelian topological orders can be prepared in a single rou nd of measurement. As an application\, I will outline how current NISQ devi ces\, ranging from Rydberg atom arrays to Google’s quantum processors\, can scalably prepare a large class of exotic phases such as non-Abelian topolo gical order and even fracton phases.

    This talk is based on 2112.0151 9\, 2112.03061\, 2209.03964\, and 2209.06202

    Join Zoom Meeting
    https://umd.zoom.us/j/99762943527?pwd=b0pPOEtBT DBSOCtsZVRab0lDWkxHUT09

    Meeting ID: 997 6294 3527
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    LAST-MODIFIED:20221010T145702Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99762943527? pwd=b0pPOEtBTDBSOCtsZVRab0lDWkxHUT09 Meeting ID: 997 6294 3527 Passcode: 38 3045 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Nathanan Tantivasadakarn TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110922T150000Z DTEND:20110922T163000Z DTSTAMP:20260828T094430Z UID:kvnpc3ecpbr2uud6dt8tt95m04@google.com CREATED:20110729T151333Z DESCRIPTION:Speaker Name: Vito Scarola\, Virginia Tech\nTitle: Wavefunctio ns for Flat-Band Lattices\nAbstract : The electronic band structure of many systems\, e.g.\, carbon-based nanostructures\, can exhibit essentially no dispersion. Models of electrons in such flat-band lattices define non-pertu rbative strongly correlated problems by default. I will review work in my group that theoretically explores strongly correlated lattice models with f lat bands. I will focus on recent work that connects wavefunctions of the quantum Hall regime to interacting flat-band lattice models in the absence of a magnetic field. I will also discuss recent results from microscopic m odeling of a specific flat-band system\, electrons in graphene nanoribbons with zig-zag edges. Our formalism indicates that zero-field flat-band latt ice systems offer arenas to study Wigner crystals\, quantum liquids\, and m agnetism.\n\n LAST-MODIFIED:20230127T203349Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221028T160000Z DTEND:20221028T170000Z DTSTAMP:20260828T094430Z UID:468o2tmet2oafhul4ql2otaioh@google.com CREATED:20221019T130032Z DESCRIPTION:Title: Exciton in Mott insulator\nSpeaker: Tsung-Sheng Huang (JQI)\nTime: Friday\, October 28\, 2022 - 12:00pm\nLocation: ATL 2324\n\n Recent optical probes have used excitons\, electron-hole bound states\, to probe correlated insulating phases of two-dimensional semiconducting materi als. Motivated by these experiments\, we investigate these composite partic les involving Mott physics. In this talk\, we will discuss the formalism of two types of Mott excitons: Intraband exciton with both charges from a sin gle band Hubbard model\, and interband exciton with only one charge in the Mott. We discuss the role of magnetism on these bound states and compare th eir properties with those from band insulators.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221019T130032Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Tsung-Sheng Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221117T150000Z DTEND:20221117T160000Z DTSTAMP:20260828T094430Z UID:2rnh30ifmq7t2go1vapjvnlsnf@google.com CREATED:20221114T162355Z DESCRIPTION:Title:  Quantum Simulation for Nuclear Effective Field Theories
    Speaker:  James Watson (QuICS)
    Time:  Thursday\, November 17\, 2022 - 10:00am
    Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390

    Quantum computer s offer the potential to perform simulations of nuclear processes that are infeasible for classical devices. With a goal of understanding the necessar y quantum resources to realize such potential\, we estimate the qubit costs and gate costs to simulate an effective nuclear field theory on a cubic la ttice\, evaluating the various trade-offs in choice of the form of the effe ctive field theory and how this choice interacts with the qubit requirement s of encoding the fermionic degrees of freedom into qubits and the gate cou nts needed for state-of-the-art Hamiltonian simulation. In particular\, we compare simulation costs and errors for a pionless effective field theory\, a one pion exchange theory\, and theories that simulate the pions dynamica lly. LAST-MODIFIED:20221114T162355Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: James Watson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081003T180000Z DTEND:20081003T190000Z DTSTAMP:20260828T094430Z UID:p4u9jtsjj16innm99d3vjai4j0@google.com CREATED:20080924T154735Z DESCRIPTION:Speaker: Al Bovik\, Laboratory for Image and Video Engineering (LIVE)\, Center for Perceptual Systems\, The University of Texas at Austin\ nTitle: "MOVIE Index for Video Quality Assessment"\n LAST-MODIFIED:20230127T203421Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130916T150000Z DTEND:20130916T160000Z DTSTAMP:20260828T094430Z UID:b5s38f4e28lupnadnqk85vfnpg@google.com CLASS:PUBLIC CREATED:20130823T173640Z DESCRIPTION:Speaker: Jay Deep Sau\, JQI\n\nTitle: The search for topologica lly degenerate Majorana modes in\nsemiconductor/superconductor interfaces:\ n\nAbstract: \nMajorana fermions are fermion-like excitations that were ori ginally\nproposed in particle physics by Ettore Majorana and are characteri zed as\nbeing their own anti-particle. In condensed matter systems Majorana \nfermions occur as fractionalized excitations with topologically\nprotecte d degeneracy associated with such excitations. In this talk\, I\nwill discu ss a recent set of proposals for realizing Majorana modes in a\nlarge class of spin-orbit coupled\, time-reversal symmetry broken\nsuperconducting sys tems. The simplicity of this class of systems has\nresulted in several expe rimental attempts\, which have successfully\nobserved preliminary evidence for the Majorana modes in the form of\nzero-bias conductance peaks and doub led Shapiro steps. Following this I\nwill then discuss future possibilities in terms of modifications to the\nexperiments to help confirm the presence of Majorana modes. LAST-MODIFIED:20230127T203546Z LOCATION:CSS Room 2324 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Jaydeep Sau TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220922T180000Z DTEND:20220922T193000Z DTSTAMP:20260828T094430Z UID:44n0lktt7gj1a79huu035482uk@google.com CREATED:20220922T002730Z DESCRIPTION:Speaker: Nicholas P. Butch
    1&nbs p\;NIST Center for Neutron Research\, National Institute of Standard s and Technology\, 100 Bureau Drive\, Gaithersburg\, MD 20899 USA
    2 \;Quantum Materials Center\, Dept. of Physi cs\, University of Maryland\, College Park\, MD 20742 USA


    Title: \;Electron Correlations and Superconductivity in Uranium Ditelluride \;

    Abstract:&nbs p\;Uranium ditelluride(UTe2) hosts an unusual form of low-te mperature superconductivity that has several outstanding experimental signa tures pointing to spin-triplet pairing\, multiple order parameters\, time-r eversal symmetry breaking\, and in-gap chiral surface states. As if that we re not enough\, reentrant superconductivity is stabilized at fields greater than 40T\, persisting to higher than 65T. After reviewing the unusual main properties of UTe2\, I will focus on recent neutron scattering results and what they tell us about electron hybridization\, magnetic inter actions\, and ramifications for superconductivity.

    Seminar also o n Zoom\, \;Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

    Ref reshments 1:30pm 1117 Toll Physics Bldg.

    LAST-MODIFIED:20220922T003403Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Nicholas P. Butch TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Sep 22_Nick Butch.pptx;FMTTYPE=application/v nd.openxmlformats-officedocument.presentationml.presentation:https://drive. google.com/open?id=1A5O4GImIYzuQ4d-_V9PgCfDkriBR_uuL&authuser=0 END:VEVENT BEGIN:VEVENT DTSTART:20081013T163000Z DTEND:20081013T173000Z DTSTAMP:20260828T094430Z UID:m8h2vr0nsjoqp8i1m79hsho0t4@google.com CREATED:20080912T182105Z DESCRIPTION:Speaker:Ashvin Vishwanath\, University of California at Berkel ey\nTitle:"Novel Orders from Frustration in Cold Atomic Gases"\n LAST-MODIFIED:20230127T203006Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130314T173000Z DTEND:20130314T180000Z DTSTAMP:20260828T094430Z UID:ef1cp99d1rfi3mg06nkp2vma4s@google.com CREATED:20130307T224626Z LAST-MODIFIED:20230127T203022Z LOCATION:Phys Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110421T180000Z DTEND:20110421T193000Z DTSTAMP:20260828T094430Z UID:bsaqo6kt0p5s6346frurlaqf64@google.com CREATED:20110406T144035Z DESCRIPTION:Speaker: Mumtaz Qazilbash\, College of William and Mary\nTitle : Nanoscale Imaging of the Electronic and Structural Transitions in Vanadi um Dioxide\nAbstract: A grand challenge of contemporary condensed matter p hysics is the understanding of the emergence of metallic transport in corre lated insulators (Mott insulators) in which\, for example\, a temperature c hange or chemical doping induces anomalous conducting phases. I will report on the electronic properties of a prototypical correlated insulator vanadi um dioxide (VO2) in which the metallic state is induced by increasing tempe rature. The pioneering technique of scanning near-field infrared microscopy allows us to directly image nano-scale metallic puddles that appear at the onset of the insulator-to-metal transition (IMT) in VO2. In combination wi th far-field infrared spectroscopy\, the data reveal divergent optical mass in the metallic puddles which is evidence of a Mott transition. I will als o present recent x-ray nano-imaging data on the structural phase transition (SPT) that accompanies the IMT in VO2. Both the SPT and IMT proceed via pe rcolation. In addition\, nanoscale x-ray diffraction reveals local\, non-mo notonic switching of the lattice structure\, a phenomenon that is not seen in the electronic IMT mapped by near-field infrared microscopy. LAST-MODIFIED:20230127T203207Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130328T180000Z DTEND:20130328T193000Z DTSTAMP:20260828T094430Z UID:kimf7eg2jh8e2ht6up6a23s60s@google.com CREATED:20130318T024138Z LAST-MODIFIED:20230127T203322Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cond. Matter Colloquium w/ R.Newrock Cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20120413 DTEND;VALUE=DATE:20120414 DTSTAMP:20260828T094430Z UID:6nolmnb441i12u5u9cvs4tena8@google.com CREATED:20120406T150316Z DESCRIPTION:http://www.umer.umd.edu/events_folder/uBi12/ LAST-MODIFIED:20230127T203016Z LOCATION:A.V. Williams Bldg.\, Room 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:4th Microbunching Instability Workshop TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081001T193000Z DTEND:20081001T203000Z DTSTAMP:20260828T094430Z UID:hkdou2glrskoeqjo4itat9m8ps@google.com CREATED:20080917T175125Z DESCRIPTION:Speaker: Professor Paul Prucnal \nTitle: All-optical processi ng for optical CDMA and network security\n LAST-MODIFIED:20230127T203539Z LOCATION:Seminar Room\, Lower Level\, LPS Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111121T173000Z DTEND:20111121T183000Z DTSTAMP:20260828T094430Z UID:4c6u8ijifcl2ha1foke8ijdeco@google.com CREATED:20111114T140122Z DESCRIPTION:Title: Cavity Optomechanics: Coherent coupling of light to mech anical oscillators\nSpeaker:Tobias J. Kippenberg\, EPFL\nAbstract: The mutu al coupling of optical and mechanical degrees of freedom via radiation pres sure has been a subject of interest in the context of quantum limited displ acements measurements for Gravity Wave Detection for many decades\, however light forces have remained experimentally unexplored in such systems. Rece nt advances in nano- and micro-mechanical oscillators have for the first ti me allowed the observation of radiation pressure phenomena in an experiment al setting and constitute the emerging research field of Cavity Optomechani cs(1).\n\nUsing on-chip micro-cavities that combine both optical and mechan ical degrees of freedom in one and the same device(2)\, radiation pressure back-action of photons is shown to lead to effective cooling(3-6) of the me chanical oscillator mode using dynamical backaction\, which has been predic ted by Braginsky as early as 1969(4). This back-action cooling exhibits man y close analogies to atomic laser cooling. For instance\, it is shown theor etically that only in the resolved sideband regime\, cooling to the quantum ground state is possible. With this novel technique the quantum mechanical ground state of a micromechanical oscillator can be reached. Using cryogen ic precooling(7) to ca. 800 mK the preparation of a micromechanical oscilla tor to only 1.7 quanta is shown\, occupying the quantum ground state ca. 4 0% of the time. Moreover it is possible in this regime to observe quantum c oherent coupling in which the mechanical and optical mode hybridize and the coupling rate exceeds the mechanical and optical decoherence rate (http:// arxiv.org/abs/1107.3761). This accomplishment enables a range of quantum o ptical experiments\, including state transfer from light to mechanics.\n\nO ptomechanical systems also offer entirely new means to control the light fi eld. Using the recently discovered phenomenon of optomechanically induced t ransparency(10) it is possible to enable devices that store light in mechan ical excitations\, or create optical delay lines with unpredecented delay t ime. Recent highlights of the literature of some of the emerging applicatio ns of cavity optomechanics will be reviewed.\n\n\n\nReferences:\n\n1.T. J. Kippenberg\, K. J. Vahala\, Science 321\, 1172 (2008\, 2008).\n2.T. J. Kipp enberg\, H. Rokhsari\, T. Carmon\, A. Scherer\, K. J. Vahala\, Physical Rev iew Letters 95\, 033901 (2005).\n3.V. B. Braginsky\, S. P. Vyatchanin\, Phy sics Letters A 293\, 228 (Feb 4\, 2002).\n4.V. B. Braginsky\, Measurement o f Weak Forces in Physics Experiments. (University of Chicago Press\, Chica go\, 1977).\n5.A. Schliesser\, P. Del'Haye\, N. Nooshi\, K. J. Vahala\, T. J. Kippenberg\, Physical Review Letters 97\, 243905 (Dec 15\, 2006).\n6.A. Schliesser\, R. Riviere\, G. Anetsberger\, O. Arcizet\, T. J. Kippenberg\, Nature Physics 4\, 415 (May\, 2008).\n7.A. Schliesser\, O. Arcizet\, R. Riv iere\, T. J. Kippenberg\, Nature Physics 5\, 509 (2009).\n8.G. Anetsberger et al.\, Nature Physics 5\, 909 (Dec\, 2009).\n9.A. Schliesser\, O. Arcizet \, R. Riviere\, G. Anetsberger\, T. J. Kippenberg\, Nature Physics 5\, 509 (2009).\n10.S. Weis et al.\, Science 330\, 1520 (Dec\, 2010).\n LAST-MODIFIED:20230127T203726Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar -Tobias Kippenberg TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130418T200000Z DTEND:20130418T210000Z DTSTAMP:20260828T094430Z UID:4q76m6437ppbkli14qad633n0o@google.com CREATED:20130411T135148Z DESCRIPTION:Speaker: Tim Chupp\, University of Michigan\nTitle: "Electric Dipole Moments of Atoms and the Neutron" \nAbstract: An Electric Dipole M oment or EDM refers to a separation of charge along the angular-momentum ax is of an atom or the neutron. An EDM arises due to forces that distinguish the handedness (parity) and direction of time\, i.e. due to violation of Pa rity and Time Reversal. Over the past 50 years\, a number of experiments ha ve been devised to measure EDMs\, but so far only upper limits have been se t. But we have strong reason to expect EDMs: first\, the well established S tandard Model of elementary particle interactions provides two ways to prod uce and EDM - through the weak interaction mixing of quark generations and through a strong-interaction parameter - though the quark-mixing contributi on is known to be extremely small compared to experimental sensitivities. t he second reason to expect EDMs is that the same forces that induce EDMs wo uld also produce the Cosmological Baryon Asymmetry. The Baryon Asymmetry is the small prevalence of matter over antimatter in the early universe that resulted in the excess of matter available to make the galaxies\, stars\, p lanets\, etc. of the current universe. The Baryon Asymmetry could not arise from Standard Model physics\, and thus the search for EDMs is the search f or new\, Beyond Standard Model physics. I will discuss what we can learn fr om EDM measurements past and future and focus on our neutorn-EDM efforts an d experiments using noble gas atoms xenon and radon.\n LAST-MODIFIED:20230127T203747Z LOCATION:CSS 2115 (JQI conference room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special AMO Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100922T193000Z DTEND:20100922T203000Z DTSTAMP:20260828T094430Z UID:5km4edot4kmpdr4q9shn06spqs@google.com CREATED:20100908T182651Z DESCRIPTION:Title: Exploration of Silicon Metal-Oxide-Semiconductor-Based Q uantum Dots Devices for Quantum Information Processing Applications\n \nBy: Prof. Hong-Wen Jiang\nDept. of Physics and Astronomy\nUniversity of Califo rnia\, Los Angeles\n \nAbstract:\nSilicon MOS technology\, developed over d ecades\, has been a cornerstone of mainstream microelectronics. Common wisd om tends to say that quantum information processing based on individual ele ctron spins in semiconductors will require new materials and new technology . However\, recently several groups around the world have demonstrated both unprecedented device stability and the abilities to control and to measure single spins on electrostatic quantum dots made out of conventional Si MOS materials. In this talk\, I would like to describe our experimental effor ts at UCLA to develop this type of device. An energy spectroscopy study of spin and valley states in the few-electron regime [1] along with a measure ment of spin relaxation time T1 of individual spins in the presence of a ma gnetic field [2]\, using a pump-and-probe technique\, will be presented. In addition\, I will describe a collaborative effort with UC Berkeley to deve lop a circuit QED structure comprised of a Si MOS quantum dot charge qubit and a superconducting microwave resonator. Finally\, I will outline our pl an to implement a Si MOS qubit device using spin exchange interactions alon e.\n \n[1] M. Xiao\, M. G. House\, and H.W. Jiang\, Appl. Phys. Lett. 97\, 032103 (2010).\n[2] M. Xiao\, M. G. House\, and H.W. Jiang\, Phys. Rev. Let t. 104\, 096801 (2010). LAST-MODIFIED:20230127T203321Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090326T161500Z DTEND:20090326T171500Z DTSTAMP:20260828T094430Z UID:8dmepqcdt8t3edqqvc353u4a6c@google.com CREATED:20090319T143202Z DESCRIPTION:Title: ION CONCENTRATION DYNAMICS: MECHANISMS FOR BURSTING AND SEIZING\nSpeaker: Ernie Barreto\, George Mason University\n\nTitle: SYNCH RONIZATION IN INTERACTING POPULATIONS OF OSCILLATORS WITH TIME VARYING COUP LING\nSpeaker: Paul So\, George Mason University LAST-MODIFIED:20230127T203519Z LOCATION:room 1207\, Energy Research Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130122T110000 DTEND;TZID=America/New_York:20130122T123000 RRULE:FREQ=WEEKLY;UNTIL=20130122T160000Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:ivuj1a6fv7mq2v13d0gd3gufok@google.com CREATED:20130115T142814Z LAST-MODIFIED:20230127T203325Z LOCATION:Physics Building 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100301T213000Z DTEND:20100301T223000Z DTSTAMP:20260828T094430Z UID:b1raj13m7ksh7ak5hppcbeg9mk@google.com CREATED:20100128T134551Z DESCRIPTION:Title : "Non-Extensive Entropy and Turbulent Quasi-Equilibrium for Space Plasmas"\nSpeaker Name: Peter Yoon\nSpeaker Institution : Univers ity of Maryland\, Institute for Physical Science and Technology\nAbstract : Charged particles detected in space rarely obey the laws of thermodynamic equilibrium in that their distributions do not follow the classic theory of Maxwell\, Boltzmann\, and Gauss. Instead\, their distributions feature enh anced energetic population called the superthermal tails. Recently\, it is suggested that the space plasma does not obey the statistical theory of Bol tzmann and Gibbs\, which is based upon the extensive entropy. Instead\, it is suggested that the space plasma obeys an alternative statistical theory based upon the non- extensive entropy. It will be shown\, however\, that th e non-Maxwellian charged- particle distribution can be explained in terms o f turbulent quasi-equilibrium. That is\, the charged particles are not in t rue thermodynamic equilibrium\, but rather\, they coexist with turbulent el ectromagnetic fluctuations in quasi steady state\, constantly exchanging en ergy and momentum between the particles and the waves\, but maintaining an overall balance. !\n\nWhether such a turbulent quasi- equilibrium state is the same as the equilibrium state dictated by the non- extensive entropy or not remains an open question\, however.\n LAST-MODIFIED:20230127T203450Z LOCATION:CSS 2400 SEQUENCE:6 STATUS:CONFIRMED SUMMARY:Atomic\, Molecular & Optical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221027T150000Z DTEND:20221027T160000Z DTSTAMP:20260828T094430Z UID:5fi5tlfji7s93nhd18ao34tn4n@google.com CREATED:20220804T154855Z DESCRIPTION:Literature Seminar

    Speaker: Collin Vincent\, UMCP

    Title: \;    Carbon Nanobelts: The Synthesis of Str ained Carbon Nanostructures

    Abstract: \;https://chem.umd.edu/events/carbon-nanobelts-synthesis-strained-carbon- nanostructures LAST-MODIFIED:20221025T135826Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221129T160000Z DTEND:20221129T170000Z DTSTAMP:20260828T094430Z UID:3jhcbocplbmjmg428p4tn7omd7@google.com CREATED:20220815T165404Z DESCRIPTION:Speaker: Dr. Susan Daniel\, Cornell University
    Title: \;    It Takes Two: Conserved Bimodal Interactions Bet ween the Coronavirus Fusion Peptide and Calcium Ions Promote Host Membrane Insertion and Viral Entry

    Abstract: \;The coronavirus disease 2019 (COVID-19) necessitates develop of effective therapies agains t the causative agent\, SARS-CoV-2\, and other pathogenic coronaviruses (Co V) that have yet to emerge. Focusing on the CoV replication cycle\, specifi cally the entry steps involving membrane fusion\, is an astute choice becau se of the conservation of the fusion machinery and mechanism across the CoV family. For coronavirus\, entry into a host cell is mediated by a single g lycoprotein protruding from its membrane envelope\, called spike (S). Withi n S\, the region that directly interacts with the membrane is called the fu sion peptide\, FP. It is the physico-chemical interactions of the FP with t he host membrane that anchors it\, enabling the necessary deformations of t he membrane leading to delivery of the viral genome into the cell when a fu sion pore opens. Thermodynamic\, kinetic\, and intermolecular interactions are useful to understand molecular level FP interactions with the host memb rane. This knowledge can be leveraged to stop the spread of infection. Here \, we examine the impact of calcium ions on CoV entry. Using cell infectivi ty\, biophysical assays\, and spectroscopic methods\, we found that calcium ions \;stabilize the FP structure during conformatio nal change that then allows its insertion into the host \;membrane\, resulting in increased lipid ordering in the membrane. This lipid ordering precedes membrane fusion and correlates with increased fusi on activity and higher levels of infection when calcium in present. As such \, depletion of calcium ions leads to structure and activity changes in the fusion peptide that correlate well with in vitro experiments using calcium -chelating agents to block cell infection. We show calcium channel blockers can block virus infection in lung cells. LAST-MODIFIED:20221128T144006Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221202T170000Z DTEND:20221202T180000Z DTSTAMP:20260828T094430Z UID:05iggnmjstu50cvjds0r2n13rh@google.com CREATED:20221128T214847Z DESCRIPTION:Speaker: Jeet Shah\, UMD

    Title: 3+1 D Quantum spin liquid from Rydberg interactions -- a proposal
    Abstract: \;Quantum Spin Liquids are exotic phases of matte r whose low-energy physics is described as the deconfined phase of an emerg ent gauge theory. With recent theory proposals and an experiment showing pr eliminary signs of Z2 topological order\, arrays of neutral atoms with Rydb erg interactions have emerged as a promising platform to realize a spin liq uid. In this work\, we propose a way to realize the deconfined phase of U(1 ) gauge theory in 3 spatial dimensions from Rydberg interactions on a pyroc hlore lattice. First\, we show that for a range of ratios of laser detuning to interaction strength\, the low energy manifold is the set of ice-rule o beying states displaying frustration – the first requirement for a spin liq uid. The second requirement of quantum resonances between these states is s erved by the laser driving term. While the long-range van der Waals interac tion weakly breaks the frustration\, we consider its effect using a gauge m ean field theory calculation. We find a range of Rabi frequencies in which the ground state is in the deconfined phase. By tuning the Rabi frequency\, one can access both the confinement-deconfinement transition driven by the proliferation of “magnetic” monopoles as well as the Higgs transition driv en by proliferation of “electric” charges of the emergent gauge theory. We suggest experimental probes for distinguishing the deconfined phase from or dered phases. This work serves as a proposal to access a confinement-deconf inement transition in 3 spatial dimensions on the Rydberg platform.< u>

    Pizza and drinks will be served after the semina r     LAST-MODIFIED:20221128T215135Z LOCATION:ATL 2324 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar - Jeet Shah TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100929T190000Z DTEND:20100929T203000Z DTSTAMP:20260828T094430Z UID:njtg3n6831m7u30i5ggkoqfpcg@google.com CREATED:20100923T181359Z DESCRIPTION:Title: Ultra-efficient Clocked Electron Transport on Helium\n \ nBy: Steve Lyon\nPrinceton University\n \nIt has long been a goal of electr onic device research to develop structures which can control and which oper ate with single electrons. This goal has taken on new importance with the i nterest in controlling individual quantum two-level systems. Isolating and controlling single electrons in a vacuum has been routine for several dec ades\, but it is difficult to see how those structures can be miniaturized to the degree necessary for a modern electronic system. In principle\, dev ices based upon semiconductor heterostructures can confine and manipulate i ndividual electrons\, and such devices have been demonstrated. However\, t he heterostructures inevitably have some defects\, which hinder scaling to more than just a handful of devices. I will discuss recent\nexperiments wh ich demonstrate devices utilizing electrons floating just above the surface of superfluid helium. Using Si chips from a CMOS foundry we have construc ted charge-coupled devices (CCDs) which can deterministically transport ele ctrons over large areas without error. These results demonstrate the absenc e of electron traps on the helium surface or other effects which would inte rfere with the electron motion. The pixels are a few microns in size\, and smaller devices appear feasible. I will discuss new devices being developed with this technology and possible applications. LAST-MODIFIED:20230127T203542Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:aboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120430T163000Z DTEND:20120430T173000Z DTSTAMP:20260828T094430Z UID:414qcmga3j29pe3mo2d47spsps@google.com CREATED:20120418T142008Z DESCRIPTION:Title: Many-Body Quantum Physics with Photons\n\nSpeaker: Kary n Le Hur\, CNRS & CPHT Ecole Polytechnique\, France\n\nAbstract: In this Ta lk\, we survey recent theoretical studies concerning the\nrealization of ma ny-body quantum physics with photons. First we introduce\nthe Jaynes-Cummin gs lattice model and discuss the emergent Mott-Superfluid\ntransition of li ght in electromagnetic resonator arrays. We also build an\nanalogy with the Bose-Hubbard model. Then\, we show how to engineer\nartificial gauge field s for light and discuss related topological phases\nof photons. At a genera l level\, transmission lines (long waveguides or\nJosephson junction arrays ) can also be viewed as Ohmic dissipative baths\nthat can be used to engine er novel many-body physics with light. As an\nexample\, we discuss a way to emulate the spin-boson model or anisotropic\nKondo model and we introduce the notion of photonic Kondo resonance\nobtained by sending microwave light in the underdamped limit.\n LAST-MODIFIED:20230127T203327Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Karyn Le Hur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221024T200000Z DTEND:20221024T210000Z DTSTAMP:20260828T094430Z UID:7ou3qif5ch08ugfi6o9akbvr93@google.com CREATED:20221024T125005Z DESCRIPTION:Title: Axis-resolved electrodynamic propertie s and low energy excitations of UTe2

    Abstract: The complex surface i mpedance of a superconductor provides many insights into its properties\, s uch as the pairing mechanism\, super- and normal-fluid responses\, Fermi su rface\, and possibly \;its topological properties. We explore the surfa ce impedance of UTe2 single crystals as a \;function of temperature usi ng resonant cavity measurements for a variety of microwave-frequency modes. We determine a composite surface impedance for each mode using resonance&n bsp\;data combined with the independently measured normal state dc resistiv ity tensor. \;We are able to determine the combination of crystallograp hic directions excited in each mode
    using the anisotropy of the resistiv ity. Studying several modes yields the surface impedance \;correspondin g to each axis. We find approximately a T^2 power-law dependence for the&nb sp\;magnetic penetration depth in both the a- and c-directions\, which is i nconsistent with a single \;pair of point nodes on the Fermi surface. W e find the zero temperature penetration depth to \;be largest for the c -direction\, which is consistent with current understanding of the Fermi&nb sp\;surface shape. The surface resistance demonstrates a relatively large r esidual loss at zero
    temperature\, and the c-direction is the most lossy .

    In-Person Location: Toll Physics Room # 1201
    < /u>Time: 4pm -5:00pm

    Also on \; Zoom: \;Meetin g ID: 975 4047 8019     LAST-MODIFIED:20221024T142042Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Arthur Carlton-Jones TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101209T190000Z DTEND:20101209T200000Z DTSTAMP:20260828T094430Z UID:u830an2f6mib2romuilg7pr85g@google.com CREATED:20101206T160222Z DESCRIPTION:Speaker: Aleksey Zimin is Assistant Research Scientist in the G enome Assembly Grou within the Institute for Physical Science and Technolog y at the University of Maryland\nTitle: "Challenges of assembling genomes f rom Next Generation Sequencing data" LAST-MODIFIED:20230127T203725Z LOCATION:1103 Biosciences Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090928T100000 DTEND;TZID=America/New_York:20090928T120000 DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com RECURRENCE-ID;TZID=America/New_York:20090928T100000 CREATED:00010101T000000Z DESCRIPTION:COLD ATOMS\nBin Wang\, Quantum phase diagram of fermion mixture s in 1D optical lattices\nRyan Barnett\, Vortex lattice locking in rotating BECs and spinor condensates\nMaxim Dzero\, Cooper pair turbulence in atomi c traps\nRajdeep Sensarma\, Measuring many body correlations in cold-atom s ystems with optical lattice modulations\nhttp://www.physics.umd.edu/cmtc/se minars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221212T200000Z DTEND:20221212T213000Z DTSTAMP:20260828T094430Z UID:5m0l2abqdaqc63vffd6eori3jr@google.com CREATED:20220824T164852Z DESCRIPTION:Speaker: Seth Koren\, Chicago University

    Title: D iscrete Gauged B-L and the Cosmological Lithium Problem

    Abstract: We study the baryon minus lepton number gauge theory broken by a scalar with charge six. The infrared discrete vestige of the gauge symmetry demands the existence of cosmic string solutions\, and their production as dynamical o bjects in the early universe is guaranteed by causality. These topological defects can support interactions which convert three protons into three pos itrons\, and we argue an `electric’-`magnetic’ interplay can lead to an amp lified\, strong-scale cross-section in an analogue of the Callan-Rubakov ef fect.
    The cosmological lithium problem—that theory predicts a primordial abundance far higher than that observed—has resisted decades of attempts b y cosmologists\, nuclear physicists\, and astronomers alike to root out sys tematics. We suggest cosmic strings have disintegrated O(1) of the primordi al lithium nuclei and estimate the rate in a benchmark scenario. To our kno wledge this is the first new physics mechanism with microphysical justifica tion for the abundance of lithium uniquely to be modified after Big Bang Nu cleosynthesis.
    LAST-MODIFIED:20221209T191629Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101130T181500Z DTEND:20101130T193000Z DTSTAMP:20260828T094430Z UID:96anovqj82o4qil1j5rfde0e8s@google.com CREATED:20101115T213009Z DESCRIPTION:Title : Neuronal Avalanches and Coherence Potentials\nSpeaker N ame: Dr. Diermar Plenz\nSpeaker Institution : National Institute of Mental Health\n LAST-MODIFIED:20230127T203806Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221115T160000Z DTEND:20221115T170000Z DTSTAMP:20260828T094430Z UID:5rg7d7lkdgictonu841hn6c74q@google.com CREATED:20221004T183911Z DESCRIPTION:When: November 15th at 11am
    Wher e: ATL 4402
    Speaker: Dr. Jay Sau (UMD)
    Title: \ ;Subtleties in chiral anomalies and time crystals – a progress report
    Abstract: \;I will discuss two topics that I have be en collaborating on in CMTC. The first involves a careful
    study of an an alog of the chiral anomaly in one dimension that was motivated by work from the Galitski
    group at Maryland which showed that the response of the ch iral charge to electromagnetic fields could
    be affected by interactions. At the same time\, the chiral anomaly\, when it arises at boundaries of
    topological phases\, is known to be associated with topological terms that cannot be renormalized. I will
    discuss explicit calculation of various response functions of one dimensional interacting systems that
    show that while interactions can affect the current response\, which is the variable used in relativistic as
    well as topological field theories to define th e chiral charge\, it does not affect the momentum response.
    The momentum response has been proposed in condensed matter anomalies by Lieb/Schulz/Ma ttis.
    The anomalous current response is shown to be related to a conserv ed chiral charge in a weakly gapped
    Sine-Gordon model.

    In a secon d part of my talk\, I will discuss work in progress towards a nearly analyt ical model for a
    classical time-crystal that builds on the period doubli ng transition of a driven Harmonic oscillator. We
    will analyze a limit o f a weakly non-linear damped version of the system where the spontaneous
    breaking of time-translation symmetry can be described as a conventional s ymmetry breaking transition
    using a Landau free-energy. Both topics are works in progress\, and the talk is intended to motivate
    discussion and collaboration.     LAST-MODIFIED:20221107T153529Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221017T190000Z DTEND:20221017T200000Z DTSTAMP:20260828T094430Z UID:7t9ulistvaihhe3ll4fjhin8p2@google.com CREATED:20221012T200437Z DESCRIPTION:
    Júlia Sisk-Reynés\ , University of Cambridge

    Abstract: \;Compounds built from two-dimensional kagome \;networks of metal ion s have long been of interest due to their potential for \;realizing a b road array of anomalous electronic states\, ranging from quantum \;spin liquid phases to unconventional superconductivity. \; More recently\,& nbsp\;kagome metals have come into focus as compelling platforms featuring an \;interplay between topologically nontrivial electronic states and c orrelated \;electron phenomena. \; This interplay can naively be re alized via the coexistence of an \;interference-driven flat band\, Dira c points\, as well as multiple van Hove \;singularities formed from the band structure of the kagome network. An enduring \;challenge is to id entify these states in real materials\, and\, in this talk\, I \;will p resent recent work exploring the AV3Sb5 \;(A=K\, Rb\, Cs) class of \;kagom e metals. \; These compounds are Z2 metals with a band filling close to the \;kagome network's van Hove singularities\, and this gives rise to charge density wave \;order as well as a lower temperature superconduc ting ground state. \; The \;unconventional properties of the charge density wave state\, how it seemingly intertwines with superconducting ord er\, as well as open questions \;and future directions will be discusse d. \;If time permits\, recent work \;searching for similar states i n related kagome metals will be presented.

    Title : Tightest constraints on Very-Light Axion-Like Particles with Chandra observations of the luminous q uasar H8121+643\, and exciting prospects with Athena and AXIS< i>

    Axion-Like Particles (ALPs) are a wel l-motivated extension to the Standard Model of particle physics whose mass m and coupling to the Electromagnetic field g are independent. At X-ray ene rgies\, we would expect the photon-ALP interaction to induce energy-depende nt modulations on the intrinsic spectra of central AGN as their quanta trav el through the magnetized cluster. I will present the tightest constraints to date on very-light ALPs\, of log(m/eV) <\; -12\, which we have inferre d from a deep Chandra grating observation of the extraordinarily luminous r adio-quiet cluster-hosted quasar H1821+643. I will also present the excitin g prospect for future ALP searches with the next-generation X-ray observato ries Athena and AXIS.


    LAST-MODIFIED:20221012T200818Z LOCATION:1136 PSC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090225T203000Z DTEND:20090225T213000Z DTSTAMP:20260828T094430Z UID:ebpnrobnatpn58atu1kredctds@google.com CREATED:20090204T161431Z DESCRIPTION:Speaker - Garnett Bryant\, NIST\nTitle: Towards Metal Nanopart icle Quantum Antennas LAST-MODIFIED:20230127T203054Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101118T210000Z DTEND:20101118T220000Z DTSTAMP:20260828T094430Z UID:mbti8cca4u6k64fg6drot54tq4@google.com CREATED:20101110T151654Z DESCRIPTION:Speaker: Mikael Oliveberg\, Dept. of\n Biochemistry & Biophysics\n Stockholm University\ n \nTitle: "Folding induced ion transfer in the ALS- \n asso ciated protein superoxide dismutase 1" LAST-MODIFIED:20230127T203656Z LOCATION:IPST 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:SPECIAL BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110928T183000Z DTEND:20110928T200000Z DTSTAMP:20260828T094430Z UID:vij6qqsdv4fissn9rmfq45i1h8@google.com CREATED:20110727T191245Z DESCRIPTION:SPEAKER: Thomas Luu - Lawrence Livermore Natl Lab\, CA \n\nTIT LE: Recent Nuclear Science Signals (with Noise) from Lattice QCD \n\nABSTR ACT: I discuss recent progress in extracting nuclear physics observables f rom lattice QCD and present preliminary results of S=3 two-baryon systems c alculated at LLNL. LAST-MODIFIED:20230127T203731Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120412T180000Z DTEND:20120412T193000Z DTSTAMP:20260828T094430Z UID:msm9s021fv4gr5u3qupcain93k@google.com CREATED:20120322T205539Z DESCRIPTION:Speaker: Igor Zutic\, University at Buffalo\nTitle: Magnetic Po larons and Bipolarons in Quantum Dots\nAbstract:\nMagnetically doped\, typi cally by Mn\, semiconductor quantum dots (QDs) allow versatile\ncontrol of magnetic ordering as compared to their bulk counterparts. For example\, the onset\nof magnetism can be realized by adding a single carrier or altering the symmetry of the\nquantum confinement\, even at a fixed carrier number [1]. Recent breakthroughs in these dots have also allowed revisiting a conc ept of magnetic polaron [2] in which a single carrier added to the QD\, thr ough exchange interaction\, aligns the nearby Mn‐spins. It has been shown t hat the induced magnetization can persist at much higher temperatures [3\,4 ] than previously thought possible [5]. By invoking an interplay of type‐II band alignment and strong Mn‐Mn antiferromagnetic coupling in (Zn\,Mn)Te/Z nSe\, we interpret a puzzling behavior in which a large binding energy of m agnetic polaron is only weekly temperature‐dependent [4]. We also explore h ow two carriers in a QD can induce magnetic ordering of Mn‐spins\, despite their ground state possessing zero carrier‐spin [6]. The corresponding pseu do‐singlet state (neither spin singlet\, nor spin triplet) has broken the t ime‐reversal and spatial symmetry. This state\, termed magnetic bipolaron [ 6]\, is an unexpected possibility for a closed‐shell magnetism that can be viewed as tug‐of‐war with Mn‐spins arising from the different spatial exten t of the orbitals for the two carrier spins. We suggest several possible ex perimental implementations for our predictions.\n\n[1] R. M. Abolfath\, A. G. Petukhov\, and I. Zutic\, Phys. Rev. Lett. 101\, 207202 (2008)\;\nR. M. Abolfath\, P.Hawrylak\, and I. Zutic\, Phys. Rev. Lett. 98\, 207203 (2007). \n[2] T. Kasuya and A. Yanase\, Rev. Mod. Phys. 40\, 684 (1968).\n[3] R. Be aulac et al.\, Science 325\, 973 (2009).\n[4] I. R. Sellers\, et al.\, Phys . Rev. B 82\, 195320 (2010).\n[5] J. Seufert et al.\, Phys. Rev. Lett. 88\, 027402 (2002).\n[6] R. Oszwaldowski\, I. Zutic\, and A. G. Petukhov\, Phys . Rev. Lett. 106\, 177201 (2011). LAST-MODIFIED:20230127T203815Z LOCATION:Rm. 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100519T173000Z DTEND:20100519T183000Z DTSTAMP:20260828T094430Z UID:vgq3g0tqgo2l47gvif4nb6hgs8@google.com CREATED:20100518T190257Z DESCRIPTION:SPEAKER: Masanori Hanada\n\nAFFILIATION: Weizmann Inst of Scie nce\, Israel\n\nTITLE: Two-Dimensional Lattice for Four-Dimensional N=4 Su persymmetric Yang-Mills\n\nABSTRACT: We provide a novel regularization me thod for four-dimensional N=4 supersymmetric \nYang-Mills (SYM) theory. Fir stly we introduce a lattice formulation of two-dimensional N=(8\,8) SYM \nw ith plane-wave like mass deformation preserving two supercharges. Difficult y of degenerate minima \nin a former lattice construction is resolved by th e deformation. This theory has a k-coincident fuzzy \nsphere solution\, aro und which 4d N=4 U(k) SYM with two commutative and two noncommutative \ndim ensions arises. Assuming that the commutative limit of the maximally supers ymmetric theory is \nsmooth\, we obtain 4d N=4 U(k) SYM on commutative R^4 without any fine tuning. As a byproduct\, we obtain 2d N=(8\,8) SYM (matrix string theory) by turning off the mass parameter after taking the continuu m limit in the two-dimensional theory.\n \n\n LAST-MODIFIED:20230127T203751Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221017T150000Z DTEND:20221017T160000Z DTSTAMP:20260828T094430Z UID:3rhvu14o534uucfflefl17vsqg@google.com CREATED:20220830T164455Z DESCRIPTION:Speaker: Victor Yakovenko\, JQI

    Title: Using circularly polarized light or stirring to control topological memory in a Chern insulator or direct current of neutral atoms in an optic al lattice

    Abstract: Under suitable experimental conditions\, some t wisted graphene multilayers and transition-metal dichalcogenides become Che rn insulators\, exhibiting the anomalous quantum Hall effect and orbital ma gnetization due to spontaneous valley polarization. We study (theoretically ) the interaction of a Chern insulator with circularly polarized light\, or iginating from the optical Stark energy shift. The interaction energy conta ins an antisymmetric term that couples the helicity of incident light and t he Berry curvature of the electronic system. Taking advantage of this inter action\, we propose an experimental protocol for switching the sign of the Chern number\, representing topological memory\, by circularly polarized li ght [1]. This framework is also applicable to the kagome material KV3Sb5\, where the time-reversal symmetry is spontaneously broken by three coexistin g charge-density waves.

    Using the same formalism\, we also show that circular stirring of an optical lattice can induce a controlled direct cur rent of bosonic atoms loaded into the lattice [2]\, similarly to the circul ar photogalvanic effect in solid-state physics. This effect can be used to transport neutral bosonic atoms in an optical lattice over a given distance in a specified direction.

    [1] Sergey S. Pershoguba and Victor M. Ya kovenko\, “Optical control of topological memory based on orbital magnetiza tion”\, Phys. Rev. B 105\, 064423 (2022)\, \;https://doi.org/10.1103/PhysRevB.105.064423

    [2] Sergey S. Pershoguba and Victor M. Yakovenko\, “Direct current in a stirred optical lattice”\, arXiv:2205.15981\, \;https://doi.org/10.1016/j.aop.2022 .169075     LAST-MODIFIED:20221013T191610Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Victor Yakovenko TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T160000Z DTEND:20221116T170000Z DTSTAMP:20260828T094430Z UID:6bhnk1adbnpev08hfqn053qe11@google.com CREATED:20220804T155351Z DESCRIPTION:Literature Seminar

    Speaker: Simone DeS ouza\, UMCP

    Title: \;    Exploring the Role of Reagent V ibrational Excitation Effects in Polyatomic Systems LAST-MODIFIED:20221112T174948Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20111024T160000Z DTEND:20111024T163000Z DTSTAMP:20260828T094430Z UID:olfffdjcgadvha6anukevugntg@google.com CREATED:20111019T143423Z LAST-MODIFIED:20230127T203025Z LOCATION:1305F Physics "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130325T154500Z DTEND:20130325T163000Z DTSTAMP:20260828T094430Z UID:pa90pdiaj3anp4825qnmun4peo@google.com CREATED:20130116T180518Z LAST-MODIFIED:20230127T203629Z LOCATION:1305 F "New Toll Room" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121119T164500Z DTEND:20121119T173000Z DTSTAMP:20260828T094430Z UID:efs4spt3fji6r27uui7sveb450@google.com CREATED:20121107T160536Z LAST-MODIFIED:20230127T203714Z LOCATION:1305 F"New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101108T190000Z DTEND:20101108T200000Z DTSTAMP:20260828T094430Z UID:r4ck5dai4sabtsg45sohe26h4k@google.com CREATED:20101105T183721Z DESCRIPTION:Title: Patterns of spatial genome organization in discovery and diagnosis\n \nSpeaker:\; Dr. Tom Misteli\nNational Cancer Institute\, NIH\ nBethesda\, MD 20892\n \nAbstract: One of the fundamental properties of mam malian genomes is their non-random organization within the three-dimensiona l space of the cell nucleus. The 3D-position of many genes and genomic regi ons changes during physiological processes such as proliferation\, differen tiation and\, importantly\, disease. We are exploring the functional role o f spatial gene positioning in fundamental processes such as transcription a nd the formation of cancer translocations. Furthermore\, non-random spatial gene positioning patterns provide a novel approach to disease diagnostics and we have demonstration the feasibility of this approach for detection of breast cancer. Key to all of these studies is the accurate mapping of gene s in 3D space. While spatial gene mapping is currently done using simple qu antitation methods\, more advanced pattern recognition tools will revolutio nize the use of spatial genome patterns in basic and applied biology. LAST-MODIFIED:20230127T203535Z LOCATION:Kim Engineering Building\, Room 1105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD-NCI Cancer Technology Partnership Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101104T193000Z DTEND:20101104T203000Z DTSTAMP:20260828T094430Z UID:8n1iu4vnmj379dlp9o03dc8bc4@google.com CREATED:20101026T184153Z DESCRIPTION:Title : The Physics of Magnetic Reconnection and Associated Par ticle Acceleration\nSpeaker Name: James Drake\nSpeaker Institution : U. of Maryland\nAbstract : Solar and stellar flares\, substorms in the Earth's ma gnetosphere\, and disruptions in laboratory fusion experiments are driven b y the explosive release of magnetic energy through the process of magnetic reconnection. During reconnection oppositely directed magnetic fields break and cross-connect. The resulting magnetic slingshots convert magnetic ener gy into high velocity flows\, thermal energy and energetic particles. A maj or scientific challenge has been the multi-scale nature of the problem: a n arrow boundary layer\, ``the dissipation region\,'' breaks field lines and controls the release of energy in a macroscale system. Significant progress has been made on fundamental questions such as how magnetic energy is rele ased so quickly and why the release occurs as an explosion. At the small sp atial scales of the dissipation region the motion of electrons and ions dec ouples\, the MHD description breaks down and whistler and kinetic Alfven dy namics drives reconnection. The\n\n dispersive property of these waves lead s to fast reconnection\, insensitive to system size and weakly dependent on dissipation\, consistent with observations. The evidence for these waves d uring reconnection in the magnetosphere and the laboratory is compelling. T he role of turbulence within the dissipation region in the form of ``second ary islands'' or as a source of anomalous resistivity continues to be explo red. A large fraction of the magnetic energy released during reconnection a ppears in the form of energetic electrons and protons -- up to 50\\% or mor e during solar flares. The mechanism for energetic particle production duri ng magnetic reconnection has remained a mystery. Models based on reconnecti on at a single large x-line are incapable of producing the large numbers of energetic electrons seen in observations. Scenarios based on particle acce leration in a multi-x-line environment are more promising. In such models a link between the energy gain of electrons and the !\n\nma\ngnetic energy r eleased\, a requirement to explain the observations\nas been established. T he talk will review key observational data and emphasize basic physical pri nciples to introduce the topic to the non-specialist.\nTitle of Event: The Physics of Magnetic Reconnection and Associated Particle Acceleration\n\n LAST-MODIFIED:20230127T203641Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221019T150000Z DTEND:20221019T160000Z DTSTAMP:20260828T094430Z UID:5ukmq4u9hvl35mfn8lqmsijmp5@google.com CREATED:20220804T140354Z DESCRIPTION:Speaker: Dr. You Zhou\, UMCP

    Title: Wi gner Crystals in Atomically Thin Heterostructures

    Abst ract: A Wigner solid — a crystal made entirely of electrons — is a model sy stem for understanding electron correlation physics that underlies a wide r ange of phenomena\, including high-temperature superconductivity and metal- insulator transitions. Despite decades of research\, it has been challengin g to realize Wigner crystals in the so-called quantum regime where quantum effects dominate over thermal fluctuations. In this talk\, I will introduce how atomically thin semiconductors\, such as transition metal dichalcogeni des\, form an exciting new materials platform to investigate these correlat ed electronic states. I will describe how we improve the materials quality\ , probe the crystallization of electrons from optical spectroscopy\, and de termine how they melt. Finally\, I will discuss how these experiments can o pen new avenues for simulating quantum many-body states and quantum informa tion processing.     LAST-MODIFIED:20221017T141533Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221207T180000Z DTEND:20221207T190000Z DTSTAMP:20260828T094430Z UID:0jij7lo0p0170gil7njp1ankum@google.com CREATED:20221130T181208Z DESCRIPTION:Title: \; Post-quantum security of symmetric-key constructions
    Speaker: \; \;Chen Bai (QuICS)
    Time: \;&nb sp\;Wednesday\, December 7\, 2022 - 1:00pm
    Location: \; \;ATL 31 00A and Virtual Via Zoom: https ://umd.zoom.us/j/96508005344

    In this talk I will give a brief in troduction about the security of various symmetric-key constructions agains t quantum attackers in two models: Q1 model and Q2 model. I’ll talk about t he difference between those two models\, why Q1 model is more realistic and some recent results about the post-quantum security of block ciphers in th e Q1 model.

    Reference: G. Alagic\, C. Bai\, J. Katz\, C. Majenz\, Po st-Quantum Security of the Even-Mansour Cipher https://eprint.iacr.org/2021/1601.     LAST-MODIFIED:20221202T010457Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Chen Bai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221031T150000Z DTEND:20221031T160000Z DTSTAMP:20260828T094430Z UID:40n6t0b6pcv7abqfk577e3g40v@google.com CREATED:20220818T204931Z DESCRIPTION:Speaker: Kin Fai Mak\, Cornell University

    Tit le: \;Simulating condensed matter physics in semiconductor moiré materi als


    Abstract:  \;The discovery of moiré materials has enabled the s tudies of condensed matter phenomena \;in a simpler a nd more controllable fashion. To a good approximation\, the system can be&n bsp\;regarded as a lattice of tunable artificial atoms\, bridging the gap between real solid-state \;materials and cold atom quantum simulators. In this talk\, I will use an archetypal& nbsp\;semiconductor moiré material\, angle-aligned MoTe 2 /WSe 2 bilayers\, to illustrate how a \;rich set of condensed matter phenomena can be “simulated” in a single material by \ ;simply adjusting the gate voltages in a field-effect dev ice. In particular\, the realization of \;the Hubbard model\, the Kane-Mele model and the Kondo lattice model will be discussed. LAST-MODIFIED:20221024T142959Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Kin Fai Mak TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120410T160000Z DTEND:20120410T170000Z DTSTAMP:20260828T094430Z UID:419efa4qnmlk2b0a85if3n8qbg@google.com CREATED:20120220T155453Z DESCRIPTION:"Absolute Measurements of the Optical Nonlinearity Near the Ion ization Threshold"\nDr. Jared Wahlstrand\nUniversity of Maryland LAST-MODIFIED:20230127T203406Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090305T171500Z DTEND:20090305T181500Z DTSTAMP:20260828T094430Z UID:5se98g8bsjlmpif9khuao5c9as@google.com CREATED:20090223T205953Z DESCRIPTION:Title: Synchronization of Calcium Alternans in Tissue\nSpeaker: Juan G. Restrepo\, University of Colorado LAST-MODIFIED:20230127T203838Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121018T183000Z DTEND:20121018T193000Z DTSTAMP:20260828T094430Z UID:vjhkod59ugr0kdlqf97je356os@google.com CREATED:20120905T170436Z DESCRIPTION:SPEAKER: Daniele Dorigoni - University of Cambridge\nTITLE: Th e Large-N Limit of 3d Super YM and Bosonization\nABSTRACT: In the large N l imit\, gauge theories compactified on $R^{d-k} \\times (S^1)^k$ are indepen dent of the $S^1$ radii\, provided that center symmetry remains unbroken. V olume independence holds for arbitrary circle size L\, therefore we can mat ch a set of correlation functions in the theory on $R^d$ to the correspondi ng observables in the reduced $R^{d-k}$ theory.\nWe focus our attention to 3D SYM reduced to 2D and show explicitly how the compact direction is encod ed in the color degrees of freedom.\nBy combining volume independence with a non-abelian bosonization procedure we will obtain a bosonized description of the starting 3D theory. As an application we compute the k-string tensi on and then conclude with some remarks about 4D SYM. LAST-MODIFIED:20230127T203811Z LOCATION:Physics Rm 2202 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120416T154500Z DTEND:20120416T163000Z DTSTAMP:20260828T094430Z UID:864874blcei8hv7e1r7f1v2hlg@google.com CREATED:20120405T143018Z LAST-MODIFIED:20230127T203345Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090204T210000Z DTEND:20090204T220000Z DTSTAMP:20260828T094430Z UID:0u1k615hdue8j4cr98d66kdpb8@google.com CREATED:20090202T162509Z DESCRIPTION:Title: Adaptive quantum communication\nSpeaker: Keye Martin\, N aval Research Laboratory LAST-MODIFIED:20230127T203700Z LOCATION:Radiation Physics\, B105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QIBEC Wednesday Meeting TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111020T180000Z DTEND:20111020T193000Z DTSTAMP:20260828T094430Z UID:00v4r0jn0b901tq3gaob5o4nes@google.com CREATED:20110914T203145Z DESCRIPTION:Speaker: Liang Fu\, Harvard University\nTitle: From Odd-Parit y Pairing to Topological Superconductivity\nAbstract:Topological supercondu ctors are unconventional superconductors which have topologically protected gapless surface Andreev bound states hosting itinerant Majorana fermions. There is currently intensive search for topological super-conductors. In th is talk\, I will propose a recently discovered superconductor Cu-doped Bi2S e3 may have an unconventional odd-parity pairing symmetry due to its strong ly spin-orbital coupled band structure. I will show on general grounds that odd-parity pairing leads to topological superconductivity. The resulting s urface Andreev bound state spectrum will be described and related to a rece nt point-contact spectroscopy experiment. LAST-MODIFIED:20230127T203831Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120510T180000Z DTEND:20120510T193000Z DTSTAMP:20260828T094430Z UID:t7urdgeb4kda63n0ajbudlrvns@google.com CREATED:20120419T152451Z DESCRIPTION:Speaker: Thirumalai "Venky" Venkatesan\, National University of Singapore\nTitle: Unusual Transport and Magnetism in Oxides and Oxide Int erfaces\nAbstract: Cationic vacancy induced magnetism seems to be a reprod ucible way to induce magnetism in oxides. I will illustrate this with the e xample of Ta in TiO2. In addition\, various magnetic phases are seen to co- exist at the atomic interfaces of insulators such as LaAlO3 (LAO) and SrTiO 3 (STO). Lastly but not the least polar oxide barriers seem to promote exch ange between magnetic layers which is an unexpected result requiring new un derstanding of magnetic interactions in oxides.\n\nHost: R. Greene/J. Pagl ione LAST-MODIFIED:20230127T203112Z LOCATION:Room 1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091209T203000Z DTEND:20091209T213000Z DTSTAMP:20260828T094430Z UID:qe962vipar8qrfv5rsj2cqm2e8@google.com CREATED:20091202T143927Z DESCRIPTION:Title: Controlling Particles: Cleanrooms then and now\nBy: Geor ge de la Vergne\nLaboratory for Physical Sciences\n \nAbstract: \nCleanroom technology has developed from a Swiss watchmaker’s case protection to mult i-billion dollar sub-micron semiconductor device manufacturing facilities o f today. The use of cleanrooms in the Laboratory for Physical Sciences is d ue in part to all the advances that others have discovered thought out the years. The advancement that we enjoy today was not available a short time a go. \n \nA portion of this talk will describe the historical development o f cleanroom technology. From the first modern-day clean rooms that owe the ir roots to particulate problems associated with the manufacture of gyrosco pes during World War II. The development has grown from the need in several areas of manufacturing\, government/military to surgical requirements. Fro m Dr. Joseph Lister’s use of Carbolic acid for contamination control\, the use of clean gloves\, surgical gowns and non-porous handles for medical ins truments and HEPA filters that were originally developed to protect personn el from deadly atomic particles but allowing air to circulate\n LAST-MODIFIED:20230127T203507Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Gree nmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090312T161500Z DTEND:20090312T171500Z DTSTAMP:20260828T094430Z UID:fkq3dohlnlvblfln72v2sigcd4@google.com CREATED:20090223T210051Z DESCRIPTION:Title: Nonlinear Dynamics of Optoelectronic Oscillators\nSpeake r: Tom Murphy\, ECE\, University of Maryland LAST-MODIFIED:20230127T203131Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100520T203000Z DTEND:20100520T213000Z DTSTAMP:20260828T094430Z UID:88iurqt36eu4sjg8d1oivg56o4@google.com CREATED:20100519T124954Z DESCRIPTION:Speaker: Prof. Tetsuya Mizumoto\nDepartment of Electrical and E lectronic Engineering\nTokyo Institute of Technology\nTitle: Optical Isolat ors: Application to Photonic Integrated Circuits\nAbstract: Active optical devices fail to operate in a predetermined manner\nwhen unwanted reflectio ns are launched into them. An optical isolator plays\nan essential role in protecting optical devices from unwanted reflections.\nCommercially availab le optical isolators based on a magneto-optic Faraday\neffect\, which are p rovided with optical fiber and optical beam interfaces\,\nare hard to integ rate with other optical devices. In case of waveguide\nisolators\, it is q uite unrealizable to use a rotation of polarization\,\nbecause the precise control of waveguide birefringence is needed. Several\napproaches have been developed to avoid the precise control of waveguide\ngeometry\, like a non reciprocal radiation and a nonreciprocal loss isolator.\nAn interferometric waveguide isolator\, which uses a nonreciprocal phase\nshift provided by t he first-order magneto-optic effect\, has the advantages\nof a single polar ization operation and a wide operational wavelength range.\nAlso\, the inte rferometric isolator is realizable in several waveguide\nplatforms by using a magneto-optic material in a cladding layer. To achieve\nthis\, we develo ped a direct bonding technique of magneto-optic garnet on\nIII-V compound s emiconductors and silicon waveguides. In this talk\, the\nintegration of op tical isolators will be addressed\, which includes a\nnon-magneto-optic app roach. LAST-MODIFIED:20230127T203553Z LOCATION:A. V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IEEE Photonics Society Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221012T193000Z DTEND:20221012T203000Z DTSTAMP:20260828T094430Z UID:4cp24boo8lhjs0r6q4gg2ttd49@google.com CREATED:20221003T181021Z DESCRIPTION: \;Title : Investigating the Nature of Energy Release durin g Solar Eruptive Events

    Speaker Name: Julie Vievering\, Applied Phy sics Laboratory

     \;
    Abstract : Solar flares are some of the most energetic events in the solar system\, producing bursts of radiation a cross the electromagnetic spectrum and often resulting in significant space weather hazards at Earth. Measurements of high-energy emission from the ea rliest phases of flares (e.g.\, pre-flare\, impulsive phases) contain key p hysics about how reconnection and energy release are triggered\, how flares develop\, and how energy is transferred into accelerated particles and hot plasma. In the first part of this presentation\, we leverage simultaneous measurements of flare hard X-ray (HXR) emission\, magnetic reconnection\, a nd coronal mass ejection (CME) acceleration using data from the Reuven Rama ty High-Energy Solar Spectroscopic Imager (RHESSI)\, the Solar Dynamics Obs ervatory (SDO)\, and the Solar TErrestrial RElations Observatory (STEREO) t o study the evolution of 12 eruptive events. We analyze the relative timing of these phenomena\, focusing on event onset and fast-varying features\, o r “bursts\,” in the HXR and reconnection rate profiles to improve our under standing of the particle acceleration mechanisms and the connections betwee n flare and CME energization.


    Further insight into early flare p hysics will be enabled by improvements in instrumentation (e.g.\, finer spa tial/temporal resolution\, greater sensitivity) and observational coverage across the electromagnetic spectrum throughout the duration of the events. In the second part of this presentation\, we present a concept for real-tim e solar flare predictions: a tool that rapidly aggregates near-real-time si gnatures of flare onset\, including X-ray and extreme ultraviolet (EUV) irr adiance measurements\, to provide early prediction of the magnitude and dur ation of ensuing solar eruptive events. Such a tool will enable triggered o bservations of solar transients\, which is particularly important for obser vatories targeting flare physics that are restricted in field of view and/o r observing time\, including novel solar instruments onboard sounding rocke ts. We present preliminary analyses of early flare signatures from the Geos tationary Observational Environmental Satellite (GOES) X-ray Sensor (XRS) a nd EUV Sensor (EUVS)\, exploring their predictive value for such an applica tion. \; \;


     \;swisdak@umd.edu     LAST-MODIFIED:20221003T181021Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120403T160000Z DTEND:20120403T171500Z DTSTAMP:20260828T094430Z UID:q5sig72eq5q3n2l6heo0ub0b9c@google.com CREATED:20120220T155435Z DESCRIPTION:Dr. Dennis Papadoupolos\nUniversity of Maryland LAST-MODIFIED:20230127T203636Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100216T160000Z DTEND:20100216T170000Z DTSTAMP:20260828T094430Z UID:5t9dim95gdq404vlfda791eu4g@google.com CREATED:20100215T134829Z DESCRIPTION:Title: Advances in NMR of proteins and their interaction with m embranes"\nSpeaker: Ad Bax LAST-MODIFIED:20230127T203830Z LOCATION:CHEM Marker Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091202T210000Z DTEND:20091202T220000Z DTSTAMP:20260828T094430Z UID:ifdh02ll1771eu3cfnp369p29g@google.com CREATED:20091201T212953Z DESCRIPTION:Topic: On new results from D0\nSpeaker: Marco Verzocchi\nInstit ute: Fermi National Accelerator Lab\, Batavia IL\n LAST-MODIFIED:20230127T203042Z LOCATION:Physics Rm. 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Particle Astro-physicsSeminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100615T143000Z DTEND:20100615T153000Z DTSTAMP:20260828T094430Z UID:j4h1tjr9nndeoqac4lfhs7s9to@google.com CREATED:20100608T202227Z DESCRIPTION:Title: Will Cold Atomic Systems Help us to Understand Supercond uctivity\nSpeaker: Cristiane Morais Smith\nInstitution: Utrecht University\ , The Netherlands LAST-MODIFIED:20230127T203007Z LOCATION:Bldg. 245 Room B105 Radiation Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Advanced Seminar/JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090915T180000Z DTEND:20090915T190000Z DTSTAMP:20260828T094430Z UID:4gde18f91r7hl669sb4qc51o94@google.com CREATED:20090903T191724Z DESCRIPTION:Title : Relating High-Scale Non-Universality in SUGRA scenario to the Low-Scale Observables at the LHC\nSpeaker Name: Subhaditya Bhattacha rya\nSpeaker Institution : HRI\, Allahabad\nNotes: This is the Elementary P article Theory Seminar\nAbstract : Apart from the most popular framework in gravity-mediated SUSY breaking scheme\, called minimal Supergravity (mSUGR A) where all the SUSY breaking scalar and gaugino masses are assumed to be unified at the high-scale\, there exist models with non-universal gaugino a nd scalar masses which are strongly motivated from GUT theory as well as fr om the low-energy constraints. In this talk\, I will discuss a few such mod els with non-universal gaugino and scalar masses\, indicate the low-energy phenomenology as well as their distinguishability from the mSUGRA scenario\ , particularly in context of the signatures at the upcoming Large Hadron Co llider Experiment.\n\nFor more information\, e-mail Yuri Kubota at ykubota@ umd.edu LAST-MODIFIED:20230127T203659Z LOCATION:4102 Physics Building SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Elementary Particles Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100607T170000Z DTEND:20100607T180000Z DTSTAMP:20260828T094430Z UID:824d9f1jqirddavj9av804ipn4@google.com CREATED:20100524T173627Z DESCRIPTION:[Speaker] Professor Aalok Misra\n[Institution] The Indian Insti tute of Technology/Roorkee\n[Title] "Swiss-Cheese Phenomenology and the Cos mo-Pheno Reconciliation"\n LAST-MODIFIED:20230127T203317Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120130T164500Z DTEND:20120130T173000Z DTSTAMP:20260828T094430Z UID:kjmfsgasa79e3g6alhjjtno5c8@google.com CREATED:20120104T141011Z LAST-MODIFIED:20230127T203220Z LOCATION:1305 F Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221207T160000Z DTEND:20221207T170000Z DTSTAMP:20260828T094430Z UID:0c602qdgqkebifqkqarkaddu60@google.com CREATED:20220804T155746Z DESCRIPTION:Speaker: Dr. Bern Kohler\, Ohio State University

    Title: \;    The Melanin Elephant: A Spectroscopist’s View of Nature’s Mysterious Pigment

    Abstract: \;Melanins a re ubiquitous natural pigments that color human skin\, overripe bananas\, c ephalopod \;ink\, and iridescent peacock feathers to name just a few examples. While sunscreening is the best-known function of melanin in skin\, melanins also bind metal ions and scavenge radicals. Prop erty emergence in melanins is of great interest not only for understanding their biological function but also for creating bioinspired\, multi-functio nal materials that exploit melanin’s intrinsic electronic and ionic conduct ivity\, redox activity\, ability to stabilize free radicals\, and broadband optical absorption. These properties are attractive for applications in bi oelectronics\, catalysis\, energy conversion and storage. Remarkably\, the atomistic structures present in melanins are obscure despite more than a ce ntury of effort\, impeding understanding of their structure-function relati onships. To gain insight into the chromophores of melanin\, femtosecond tra nsient absorption experiments have been carried out on synthetic melanin po lymers. Transient spectral holes centered about the laser excitation wavele ngth are detected at room temperature\, providing evidence of absorbers wit h a broad distribution of transition energies. The observed bleach recovery dynamics provide valuable insights into couplings among melanin’s chromoph ores. By combining femtosecond time-resolved infrared (TRIR) spectroscopy w ith the ability to select chromophore subensembles with a tunable UV-vis ex citation pulse\, a vibrational fingerprinting technique is demonstrated tha t correlates electronic and vibrational properties of melanin’s chromophore s. These top-down studies are augmented by a bottom-up research program to construct a melanin mimic from structurally well-defined subunits. This wor k has led to intriguing stabilized quinones that reproduce several of melan in’s hallmark properties. LAST-MODIFIED:20221129T170109Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20081121T190000Z DTEND:20081121T200000Z DTSTAMP:20260828T094430Z UID:268u4f1fictb3i8mkfj5g6jpoc@google.com CREATED:20081119T161630Z DESCRIPTION:Speaker: Anil Zenginoglu\, University of Maryland\nTitle: "Null infinity on a gridshell" LAST-MODIFIED:20230127T203755Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111115T160000Z DTEND:20111115T170000Z DTSTAMP:20260828T094430Z UID:62hs8r9j4i60dkf94a0h4umhdg@google.com CREATED:20111107T214105Z DESCRIPTION:Title : New Light Sources as Tools for Materials Science Grand Challenges\nSpeaker Name: Gwyn P. Williams\nSpeaker Institution : Jefferson Lab\, Newport News\, Virginia\nAbstract : The National Academy of Science\ , Department of Energy Office of Science and National Science Foundation ha ve recently defined a set of scientific “Grand Challenges” for the 21st Cen tury. DOE’s interest is a secure and sustainable energy future in a clean e nvironment. Addressing many of the challenges will require an X-ray laser – a coherent ultra-bright light source whose wavelength is of atomic dimensi ons. The machine will cost $1-2B\, and will be based on technology develope d at Jefferson Lab. In this talk we will address the science motivating the X-ray laser\, will describe the physics and nature of the source itself\, and talk about a potential collaborative role in this project.\nWork suppor ted by the Office of Naval Research\, the Joint Technology Office\, the Com monwealth of Virginia\, the Air Force Research Laboratory\, the US Army Nig ht Vision Lab\, and by DOE under contract DE-AC05-06OR23177. LAST-MODIFIED:20230127T203724Z LOCATION:1105 Kim Engineering Building (Pepco Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131008T200000Z DTEND:20131008T210000Z DTSTAMP:20260828T094430Z UID:o4memu0udn1folmmvg8446sn50@google.com CREATED:20130821T151530Z DESCRIPTION:Speaker: Krishna Rajagopal\, MIT\n\nTitle: The Hottest\, and Most Liquid\, Liquid in the Universe\n\nAbstract: Before experiments at th e Relativistic Heavy Ion Collider started recreating little droplets of the matter that filled the microseconds-old universe\, this stuff was thought to be a tenuous gas-like plasma. Now we know from experiments at RHIC and a t the Large Hadron Collider that at these extreme temperatures nature serve s up hot quark soup --- the hottest liquid in the universe and the liquid t hat flows with the least dissipation. The only other comparably liquid liqu id is the coldest liquid in the universe\, namely the fluid made of trapped fermionic atoms at microKelvin rather than TeraKelvin temperatures. These are two examples of strongly coupled fluids without any apparent quasiparti cle description. I will describe how physicists are using RHIC and LHC expe riments --- as well as calculations done using dualities between liquids an d black holes discovered in string theory --- to discern the properties of hot quark soup. LAST-MODIFIED:20230127T203814Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100210T173000Z DTEND:20100210T183000Z DTSTAMP:20260828T094430Z UID:3s3g1hgvicg2g57f5cnc47eukc@google.com CREATED:20100127T154131Z DESCRIPTION:SPEAKER: Toru Kojo\n\nAFFILIATION: Brookhaven National Lab\, U pton NY\n\nTITLE: Quarkyonic Chiral Spirals\n\nABSTRACT: We argue that the chiral symmetry breaking/restoration in cold\, \nconfining dense quark mat ter\, called "quarkyonic" matter\, whose presence is expected to be relevan t for intermediate density region of the phase diagram. There the confining correlation among quarks survives near the \nFermi surface. We will show t hat the strong infrared correlations induce the chiral spiral\, i.e.\, the spatial modulation of the chiral condensate. It breaks the chiral symmetry locally but restores it globally\, naturally connecting chiral symmetry bro ken phase and restored phase.\n LAST-MODIFIED:20230127T202944Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar - Postponed to 2/17 TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131022T180000Z DTEND:20131022T193000Z DTSTAMP:20260828T094430Z UID:l3h29bfk5e7ra484bmf9vmg9t4@google.com CREATED:20131008T130240Z DESCRIPTION:Title: "(Non)perturbative QCD and Jet Substructure"\n\nSpeaker: Jesse Thaler\, MIT\n\nAbstract: Perturbative QCD is a powerful tool for ca lculating the properties of jets at the LHC. However\, there are many jet observables for which non-perturbative input from QCD is needed. In this t alk\, I present three case studies at the boundary between perturbative and non-perturbative QCD---ratio observables\, track-based measurements\, and hadronization effects---all of which are relevant for new physics searches at the LHC. LAST-MODIFIED:20230127T203903Z LOCATION:1204 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101020T163000Z DTEND:20101020T173000Z DTSTAMP:20260828T094430Z UID:j8auot86a6po091q7n3p4slgeo@google.com CREATED:20100930T194844Z DESCRIPTION:Title: Near sightedness and linear scaling of Electronic Matter -A Closer Look.\nSpeaker: Dr. Walter Kohn\, UCSB\nAbstract : The concept of "nearsightedness of electronic matter (NEM)" was introduced by the speaker in 1996. It is\, loosely speaking\, the fact that the electronic propertie s at a reference point r0 are not significantly affected by a potential per turbation\, w(r’)\, unless the “footprint” of w(r’) comes sufficiently clo se to r0. Important chemical properties like the transferability of bond e nergies between different environments can be quantitatively estimated\, us ing NEM\, provided long-range Coulomb interactions between electrons are i gnored (as in the early Sommerfeld \ntheory).\n\nIn this seminar\, the spea ker will present an examination of the question of the persistence of NEM\, even in the presence of the actual\, long-range\, Coulomb interactions bet ween electrons. In addition\, implications of long-range interactions betwe en electrons for linear scaling of computations involving N atoms\, where N >>1\, will be discussed.\n LAST-MODIFIED:20230127T203709Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110314T150000 DTEND;TZID=America/New_York:20110314T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110314T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Warped Penguins: The Empire Strikes Back"\n[Speaker] P hilip Tanedo\n[Institution] Cornell University\n[Abstract] In the Randall-S undrum scenario of a warped extra dimension\, the lepton flavor violating m u to e gamma 'penguin' diagram sets bounds on the KK and anarchic Yukawa sc ales that are complimentary to those obtained from tree-level processes. I will present the current status of these bounds and the one-loop finiteness of this loop-level process. The talk will be based on arXiv:1004.2037 and follow up works in preparation. LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081125T190000Z DTEND:20081125T200000Z DTSTAMP:20260828T094430Z UID:jc90fgj2hhhil88tr5jlu2e1r4@google.com CREATED:20081119T182701Z DESCRIPTION:Speaker: Prof. Gerhard Birkl\, Darmstadt Technical University\n Title: "Quantum Information Processing with Atoms in Optical Micro-Potentia ls" LAST-MODIFIED:20230127T203806Z LOCATION:Space Sciences\, Room 2224 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gerhard Birkl's Special AMO Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130408T163000Z DTEND:20130408T173000Z DTSTAMP:20260828T094430Z UID:20gqp7pfe648ldtvpjh34bju84@google.com CREATED:20130116T182004Z DESCRIPTION:It is often said that we live in an analog world but all inform ation is discrete. I will address this dichotomy in a number of contexts\, including wave packets\, Schrödinger cats\, macroscopic entangled states\, OAL states\, and even an eigenvalue problem for a time operator. LAST-MODIFIED:20230127T203302Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Carlos Stroud TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090416T163000Z DTEND:20090416T173000Z DTSTAMP:20260828T094430Z UID:9iomn2c0fcrvsk4q3g8b162fb8@google.com CREATED:20090128T204032Z DESCRIPTION:Speaker: Robert Ecke (Los Alamos National Laboratory)\nTitle: T urbulence in Flatland: Transfer Mechanisms and Lagrangian Dynamics LAST-MODIFIED:20230127T203340Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091029T161500Z DTEND:20091029T171500Z DTSTAMP:20260828T094430Z UID:hav91abd46rfukjuv97p871c1o@google.com CREATED:20091015T202638Z DESCRIPTION:Title :The influcnece of short orbits on wave chaotic scatterin g\nSpeaker Name: Steven Anlage\nSpeaker Institution : UMD - Physics\n LAST-MODIFIED:20230127T203525Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110426T160000Z DTEND:20110426T170000Z DTSTAMP:20260828T094430Z UID:4hrefpmhdpsk4bumqe92c5v6mo@google.com CREATED:20110422T171846Z DESCRIPTION:Description: Teaching Brown Bag is a monthly lunch-hour meeting for Physics faculty and instructors to come together to talk about teachin gs\, students\, classrooms\, curriculum etc. in an informal\, safe\, non-ju dgmental environment. This coming Tuesday the topic of discussion is about the engineering sequence of courses (Phys 161\, 260\, 270): Reflections and discussion on engineering students' motivations\, their learning\, and the ir needs in the physics classroom. (What we end up talking about is\, of c ourse\, amenable to the interests of the participants.) You are welcome to propose topics for discussions for future meetings. \n LAST-MODIFIED:20230127T203326Z LOCATION:Room 1303 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Teaching Brown Bag TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110413T151500 DTEND;TZID=America/New_York:20110413T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110413T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Test bodies and naked singularities: is the self-force the cosmic censor?"\n[Speaker] Enrico Barausse\n[Institution] University o f Maryland\n[Abstract] Jacobson and Sotiriou showed that rotating black ho les could be spun-up past the extremal limit by the capture of non-spinning test bodies\, if one neglects radiative and self-force effects. This would represent a violation of the Cosmic Censorship Conjecture in four-dimensio nal\, asymptotically flat spacetimes. We show that for some of the trajecto ries giving rise to naked singularities\, radiative effects can be neglecte d. However\, for these orbits the conservative self-force is important\, an d seems to have the right sign to prevent the formation of naked singularit ies. LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220922T180000Z DTEND:20220922T190000Z DTSTAMP:20260828T094430Z UID:3v8n3q70ubdque8sfmd1cjrguc@google.com CREATED:20220919T132132Z DESCRIPTION:
    When: \;Thursday\, September 22nd at 2pm
    W here: \;ATL4402 (CMTC Conference Room)
    Speaker: \;Peter Lunts\, Postd octoral researcher at JQI and QuiCS\, UMD
    Title: Non-Hertz -Millis scaling of the antiferromagnetic quantum critical metal via scalabl e Hybrid Monte Carlo
    Abstract: \;Over the last decade there h as been a surge of activity in studying various quantum phenomena via elect ronic `constructor models' that lack the fermion sign problem. Of note are constructor models of quantum phase transitions in metallic systems\, where it is easier to find such microscopic models due to the notion of universa lity. However\, this agenda has been hampered due to the expensive scaling with system size of Determinant Quantum Monte Carlo\, making it difficult t o convincingly extract long-wavelength information from the critical theory . \; \;
    In this talk I will introduce a Hybrid Monte Carlo (HMC) algorithm with a novel auto-tuning procedure. We apply this method to the O(3) spin-fermion model\, a minimal model of the onset of antiferromagnetic order in a two-dimensional metal. Our method allows us to study unpreceden tedly large systems of 80×80 sites\, even at criticality. To characterize t he universality class of the quantum critical point\, we extract the scalin g exponents and functional form of the static and zero-momentum dynamical s pin susceptibility. We find a strong violation of the Hertz-Millis form\, c ontrary to all previous results. The form that we do observe provides stron g evidence that the universal scaling is actually governed by the fixed poi nt of [Phys. Rev. X 7\, 021010 (2017)]\, even away from perfect hot-spot ne sting. Our results suggest that controlled analytical calculations of the c ritical theory near perfect hot-spot nesting can be used to make qualitativ ely correct predictions at larger nesting angles of other observables. Addi tionally\, the HMC method we introduce is generic and can be used to study other fermionic models of quantum criticality\, where there is a strong nee d to simulate large systems. \;


    Host: \;Pr of. Jay Sau LAST-MODIFIED:20220919T132132Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081010T193000Z DTEND:20081010T203000Z DTSTAMP:20260828T094430Z UID:p3psak33ke322o86599pogpu6g@google.com CREATED:20081001T152505Z DESCRIPTION:Speaker: Robert Provine\, University of Maryland\, Baltimore Co unty\nTitle: "Tickle and Beyond" LAST-MODIFIED:20230127T203058Z LOCATION:NASA/Goddard Space Flight Center\, Building 3 Auditorium SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Scientific Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131008T171500Z DTEND:20131008T183000Z DTSTAMP:20260828T094430Z UID:4vjh3mo3580a8j5rpbv92nurng@google.com CREATED:20130930T145509Z DESCRIPTION:Title : Szilard-Machine-Like Features in a Processive Motor Pro tein & Afterthoughts on Dolphins and Winnetou.\nSpeaker Name: Professor Mar tin Bier\nSpeaker Institution : East Carolina University\n LAST-MODIFIED:20230127T203615Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101201T190000Z DTEND:20101201T200000Z DTSTAMP:20260828T094430Z UID:6tg2egg9k3gr2f9e41h6pbr9go@google.com CREATED:20101115T204052Z DESCRIPTION:[Title] "Giant K-factors"\n[Speaker] Gavin Salam \n[Institution s] CERN\, Princeton U.\, LPTHE and UPMC in Paris\n[Abstract] It has become evident in the past few years that there are cases where popular hadron col lider observables (HT\, etc.) are subject to "giant" QCD radiative correcti ons\, which are much larger than the leading-order QCD prediction. In one e xample from Z+jet production\, supposedly subleading QCD corrections modify the leading-order prediction by a factor of order 50. Such giant K-factors usually arise because some new\, enhanced channel opens up in higher order s of perturbation theory. This understanding can help guide one's choice of experimental observables\, so as to limit the exposure to giant K-factors -- for example in tails of distributions being used in new-physics searc hes. Alternatively\, one can supplement existing calculations for adversely affected observables using a well-motivated procedure to bring the perturb ative QCD predictions back under control.\n[Note] Lunch will be served in r oom 1305F at 12:30pm\n\n\n\n LAST-MODIFIED:20230127T203203Z LOCATION:1305F Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle & High Energy Theory-Experiment Joint Seminar w ith Hopkiins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221018T170000Z DTEND:20221018T180000Z DTSTAMP:20260828T094430Z UID:2ro7t1tu18v8eie47dod4qcqit@google.com CREATED:20220920T114202Z LAST-MODIFIED:20220920T114202Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110929T200000Z DTEND:20110929T210000Z DTSTAMP:20260828T094430Z UID:hm98gdel6am7qrm7390bi8fepk@google.com CREATED:20110804T200014Z DESCRIPTION:Title: "Exploring the String Axiverse with Astrophysical Black Holes?"\nSpeaker:Sergei Dubovsky\nInstitution: New York University\nAbstrac t: Combining the QCD axion as a solution to the strong CP problem with the properties of axions in string theory suggests the simultaneous presence of many ultralight axions with masses homogeneously distributed over the log scale---the "Axiverse". These axions give rise to a number of distinctive observational signatures\, including the rotation of the CMB polarizations at the level within the reach of the Planck satellite\, and steps in the da rk matter power spectrum. A surprising evidence for the axions with masses in the range 10^(-22) to 10^(-10) eV may come from observations of astrophy sical black holes through the Penrose superradiance process. When the axion Compton wavelength is of order of the black hole size\, the axions develop "superradiant" atomic bound states around the black hole "nucleus". Their occupation number grows exponentially by extracting rotational energy from the ergosphere\, culminating in a rotating Bose-Einstein axion condensate e mitting gravitational waves. This mechanism creates mass gaps in the spectr um of rapidly rotating black holes and gives rise to a distinctive gravity wave signal. In particular\, the QCD axion with the decay constant of order the GUT scale affects the dynamics of stellar mass black holes. This opens a possibility for a discovery of the QCD axions through ongoing measuremen ts of black hole spins. The corresponding gravity wave signal may be within the reach of the Advanced LIGO.\n LAST-MODIFIED:20230127T203227Z LOCATION:1201 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100908T200000Z DTEND:20100908T213000Z DTSTAMP:20260828T094430Z UID:o3a8rcf6oah4440hi0beeua7hc@google.com CREATED:20100825T135922Z DESCRIPTION:Title: Organizational Meeting LAST-MODIFIED:20230127T203241Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101108T210000Z DTEND:20101108T220000Z DTSTAMP:20260828T094430Z UID:jjkied7t2iu3o7ktooen05ah98@google.com CREATED:20101102T171452Z DESCRIPTION:Speaker: Arpita Upadhyaya\n Universi ty of Maryland\n \nTitle: "Spreading itself thin: actin dynamics\n at cellular contacts". LAST-MODIFIED:20230127T203248Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100208T211500Z DTEND:20100208T223000Z DTSTAMP:20260828T094430Z UID:f86f3otcqm8r4vgs1ncc76mik0@google.com CREATED:20100119T212312Z DESCRIPTION:Title : Energetic particle activity at 1 AU during the current Solar Minimum\nSpeaker Name: Glenn Mason\nSpeaker Institution : Johns Hopki ns University Applied Physics Laboratory\nAbstract : The current solar mini mum is unprecedented since the start of space age with sunspot count and si milar measures of solar activity reaching low levels not seen for about a c entury. Although the last significant solar energetic particle events took place in December 2006\, nevertheless there has been a good deal of transie nt energetic particle activity at 1 AU. This activity has been observed fro m new vantage points with the twin STEREO spacecraft\, and the continued op eration of instruments on the Advanced Composition Explorer (ACE) mission. During this period\, high speed solar wind streams continued to generate Co rotating Interaction Regions (CIRs) with great regularity\, and at a signif icantly higher level than the previous solar minimum in 1996-97. This unexp ected development was caused by the nearly continuous presence of coronal h oles near the solar equator and may be related to the weak solar magnetic f ields at the poles during the current minimum. The combined !\n\ncapabiliti es of ACE and STEREO made it possible to characterize new features of CIRs since single events moved past the three spacecraft in sequence\, revealing a surprising degree of variability. We will discuss these features of the 2007-2010 solar minimum\, and will also comment on a couple of examples of small\, 3He-rich solar energetic particle events whose source regions could be identified without problems of source confusion generally present durin g active periods. These events lacked typical features such as type III rad io bursts generally associated with impulsive events\, and may give new ins ights into possible acceleration mechanisms.\n LAST-MODIFIED:20230127T203532Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101117T160000Z DTEND:20101117T170000Z DTSTAMP:20260828T094430Z UID:ojbnq3f1iupt0q475ruqmhjrd4@google.com CREATED:20101021T161727Z DESCRIPTION:Title: Renewable Energy Programs and Priorities at the U.S. Dep artment of Energy\nFeatured Speaker: Steven Chalk\, Chief Operating Office r and Acting Deputy Assistant Secretary for Renewable Energy LAST-MODIFIED:20230127T203615Z LOCATION:Benjamin Banneker Room Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Research Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091116T170000Z DTEND:20091116T180000Z DTSTAMP:20260828T094430Z UID:8g4reo4nmvnne06lls7k5m2spc@google.com CREATED:20091015T202205Z DESCRIPTION:Title : AppEl Seminar - Technology for shipboard free electron lasers (FELs) at optical wavelengths\nSpeaker Name: Patrick O'Shea\nSpeaker Institution : UMD - ECE\, IREAP\nNotes: Bring your lunch. Beverages will be provided.\n LAST-MODIFIED:20230127T203037Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110311T163000Z DTEND:20110311T173000Z DTSTAMP:20260828T094430Z UID:4ch9l8cbl02jjlae0kt5l5edoo@google.com CREATED:20110302T183026Z DESCRIPTION:Speaker: Bill Freeman\, MIT\nTitle: Removing blur due to camera shake from images \nABSTRACT: "Blind deconvolution" is a beautiful\, ill-p osed problem: given an image that has been blurred by some unknown convolut ion kernel\, estimate the image before it was blurred. Lurking within this problem are nice\, deep questions: What is an image\, and how can you tell when one has been blurred? How should we solve very underdetermined infer ence problems? \nWe take a Bayesian approach\, invoking a prior on both ima ges and blur kernels. The choice of estimator is important for obtaining t he desired solutions. An MAP estimate of the blur kernel and unblurred ima ge typically favors interpreting the data as a sharp photo of a blurry subj ect\, and thus favors not changing the blurry image.\nInstead\, we can find the desired solutions by using an MMSE estimator\, or\, alternatively\, by finding the MAP estimate but of only the blur kernel\, marginalizing over possible image interpretations. I'll show our results on images people hav e submitted to us\, and present our dataset for evaluating camera shake dec onvolution algorithms. \nThe material of the talk is covered in these paper s\, and was joint work with the following authors: \nR. Fergus\, B. Singh\, A. Hertzmann\, S. Roweis\, and W. T. Freeman.\nRemoving camera shake from a single image\, SIGGRAPH 2006.\nhttp://people.csail.mit.edu/billf/papers/ deblur_fergus.pdf \nA. Levin\, Y. Weiss\, F. Durand\, and W. T. Freeman. Un derstanding and evaluating blind deconvolution algorithms\, CVPR 2009.\nhtt p://www.wisdom.weizmann.ac.il/~levina/papers/deconvLevinEtalCVPR09.pdf LAST-MODIFIED:20230127T203303Z LOCATION:1115 CSIC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series on Vision TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110523T180000Z DTEND:20110523T193000Z DTSTAMP:20260828T094430Z UID:p45rrrn6u0tcf1rta4jhors2ak@google.com CREATED:20110516T145933Z DESCRIPTION:Title : Quantum Hall physics with photons and its applications\ nSpeaker Name: Mohammad Hafezi\nSpeaker Institution : JQI\nNotes: For more talks see: http://www.physics.umd.edu/cmtc/seminars.html\nAbstract : Phenom ena associated with the topological properties of physical systems can be n aturally robust against perturbations. This robustness is exemplified by qu antized conductance and edge state transport in the quantum Hall and quantu m spin Hall effects. In this talk\, I show how exploiting topological prope rties of optical systems can be used to implement robust photonic devices. I demonstrate how quantum spin Hall Hamiltonians can be created with linear optical elements using a network of coupled resonator optical waveguides ( CROW) in two dimensions. As a specific application\, I will show that topol ogical protection can be used to dramatically improve the performance of op tical delay lines and to overcome limitations related to disorder in photon ic technologies.\n LAST-MODIFIED:20230127T203909Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120511T170000Z DTEND:20120511T210000Z DTSTAMP:20260828T094430Z UID:oahru7uh2p3md9v5luj5kid2tk@google.com CREATED:20120507T192719Z DESCRIPTION:"Electromagnetic Counterparts to Gravitational Wave Sources"\nD ate: 11 May 2012\nTime: 1pm - 5:00 pm\nLocation: NASA-Goddard Blg 34\, Room W150 (GSFC Badge Required - See Below)\n\nThe Maryland-Goddard Joint Space -Science Institute (JSI) will have its next minisymposium at NASA's Goddard Space Flight Center. All talks will be 20 minutes plus 10 mintues for ques tions. The schedule is as follows:\n\n1:00-2:00 -- Snacks\n2:00-2:30 -- Or i Fox: Supernovae and Gravitational Waves\n2:30-3:00 -- Neil Gehrels: Gam ma-ray Bursts and Gravitational Waves\n3:00-3:30 -- Ranjan Vasudevan: What Do AGN Not Do? The Possibility of Unique Merger Signatures\n3:30-4:00 -- Break\n4:00-4:30 -- Bruno Giacomazzo: Simulations of GW Emission from Insp iraling Binaries\n4:30-5:00 -- Peter Shawhan: Triggering GW Searches on EM Events\n\nPlease note that NASA-Goddard is a secured facility and you will require a GSFC badge to gain entry to the campus. If you wish to attend th is event and do not have a Goddard badge\, you may request one using the on line application. \n\nBadge Request Deadlines: Foreign Nationals must subm it their badge request by Monday\, May 7th. U.S. citizens (including green card and legal permanent residents) have until noon on Wednesday\, May 9th \, to submit their request.\n\nIf you have problems or questions\, please c ontact Lynette Queen (lynette.queen@nasa.gov) well in advance of the event. LAST-MODIFIED:20230127T203701Z LOCATION:NASA-Goddard Blg 34\, Room W150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110922T173000Z DTEND:20110922T180000Z DTSTAMP:20260828T094430Z UID:fh457ou7omgmapbvrelgq2heno@google.com CREATED:20110914T203940Z LAST-MODIFIED:20230127T203840Z LOCATION:Rm. 1305F\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221014T193000Z DTEND:20221014T203000Z DTSTAMP:20260828T094430Z UID:2dn9ppjhpl35dhacqub352h6l1@google.com CREATED:20220915T144025Z DESCRIPTION:Speaker: Dr. Nemes\, UMCP

    Title: \; Building Single-cell Mass Spectrometry to Drive Discoveries in Neurodevelop mental Biology


    Abstract: \;Knowle dge of all the types of molecules that are produced in cells as they establ ish different tissues and organs is key to understanding normal development and function and design efficient therapeutics. Even today\, after the seq uencing of entire genomes\, there is limited information on how molecules d ownstream\, specifically proteins and metabolites contribute to cell proces ses. The limitation has been a lack of sufficiently sensitive high-resoluti on mass spectrometry (HRMS) technologies that can measure these biomolecule s with scalability in space and time and compatibility with in vivo conditi ons\, a prerequisite for functional biological studies. In this presentatio n\, I will discuss ultrahigh-sensitivity HRMS technologies that my laborato ry has pioneered to enable single-cell measurements in situ and also in viv o. Our custom-built capillary electrophoresis and electrospray ionization i nterfaces enabled a record 30 zmol (~18\,000 copies) lower limit of detecti on and a broad 6-log-order linear dynamic concentration range for quantific ation. These analytical performance metrics allowed us to embark on a syste matic exploration of molecular differences between specific\, identified ce lls in live embryos of X. laevis (frog) and zebrafish and identified neuron s in the mouse central nervous system. Our quantitative data on thousands o f different proteins and hundreds of different metabolites revealed previou sly unknown molecular heterogeneity between cells and neurons in these syst ems. These insights in turn allowed us to design hypothesis-driven studies to test the biological significance of the dysregulated molecules\, leading to multiple discoveries along the way\, including: (i) molecules that can alter normal cell fate decisions\; (ii) long-range small-molecular gradient s in the embryo\; (iii) signaling between neighboring embryonic cells\; (iv ) small-molecular patterning of the embryonic body plan\; (v) early metabol ic impacts on the cognitive-visual performance. As we learn more about mole cules\, our biological experiments call for enhancements in analytical perf ormance\, thus mutually strengthening chemistry and biology forward to help better understand the cell\, the functional building block of life. LAST-MODIFIED:20221011T164602Z LOCATION:Chemistry Building (091)\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081110T213000Z DTEND:20081110T223000Z DTSTAMP:20260828T094430Z UID:cdt35qukbu87ofmnurvualagn0@google.com CREATED:20080915T191128Z DESCRIPTION:Speaker:TBA\, TBA\nTitle:"TBA"\nWeb site:http://space.umd.edu:8 080/\nMore Information: Contact John Paquette\n(See paquette@umtof.umd.edu) \n LAST-MODIFIED:20230127T203655Z LOCATION:Computer and Space Sciences\, Room: 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221114T213000Z DTEND:20221114T223000Z DTSTAMP:20260828T094430Z UID:31iv8u78prb3pous63h2vg96u8@google.com CREATED:20221108T142803Z DESCRIPTION:Title: \;Extreme Solar Events
    < br>Speaker: \;Ed Cliver\, \;National Solar Obser vatory\, Boulder CO

    Abstract: \;The study of extreme solar activity began with Carrington’s observat ion of a white-light flare in 1859\, but it is only within the last two dec ades that extreme events\, as a separate class\, have been examined in deta il. I trace the growth of the field\, including expansions into the past (v ia cosmogenic nuclides in tree rings and ice cores) and beyond the Sun (sup erflares on Sun-like stars) and review observed and projected extremes of s olar and solar-terrestrial phenomena including solar flares\, coronal mass ejections\, geomagnetic storms\, and solar energetic proton events. The inf erred high-energy proton event in 775 AD is the best candidate for a solar black swan (unexpected event with severe consequences) while the solar deci metric outburst on 6 December 2006 presents a clear example of a dragon kin g (an extreme event that differs in kind from other such events that are me rely large).

    Ta lk Recording

    Notes: Join the meeting at 4:15 for meet and greet.  \;
    Visit https://bit.ly/2PmJoT 6 to be added to the email list.     LAST-MODIFIED:20221117T063142Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220927T180000Z DTEND:20220927T193000Z DTSTAMP:20260828T094430Z UID:5jreog8p159067d769bv1sdvii@google.com CREATED:20220926T191114Z LAST-MODIFIED:20220926T191114Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Talk: Dr. Sriram Guddala on the topic of TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081105T210000Z DTEND:20081105T220000Z DTSTAMP:20260828T094430Z UID:uc18hbt1m4cbmq7ut4kntf877s@google.com CREATED:20080915T190439Z DESCRIPTION:Speaker:Michael Lilly\, Sandia National Laboratories\nTitle:Sil icon Quantum Information Topic\n LAST-MODIFIED:20230127T203638Z LOCATION:Radiation Physics\, Room: B105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QIBEC WEDNESDAY MEETING TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100216T160000 DTEND;TZID=America/New_York:20100216T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100216T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Dan Kleppner\, Massachusetts Institute of Techno logy\nTitle: "The Fabulous Life of Albert A. Michelson"\n\nAbstract: Althou gh A.A. Michelson is remembered primarily for the\nMichelson-Morley experim ent\, he\, himself\, regarded his attempt to\nobserve the ether as a profou nd failure. Raised in a California mining\ncamp\, Michelson was a prodigy i n experimental physics. Self educated\nin research\, and working in the age of iron and steam\, he founded the\nfield of precision measurements by mea suring the meter in terms of the\nwavelength of an atomic spectral line\, t hus creating the first natural\nphysical standard. Michelson also invented Fourier transform\nspectroscopy\, discovered the fine structure of hydrogen \, provided the\nfirst experimental confirmation of Maxwellʼs kinetic theor y\, made the\nfirst measurement of the diameter of a star\, and became the United\nStatesʼ first Nobel Laureate in science. In spite of these successe s\,\nMichelson was never reconciled to his failure to find the effect of\nt he ether. LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121025T173000Z DTEND:20121025T180000Z DTSTAMP:20260828T094430Z UID:7qdncl74k6um4328l9r3q9k87k@google.com CREATED:20120919T182040Z LAST-MODIFIED:20230127T203729Z LOCATION:Room 1305F Physics Building\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Seminar Reception TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121120T210000Z DTEND:20121120T220000Z DTSTAMP:20260828T094430Z UID:r070r42imj3rhekk3bt5bihi10@google.com CREATED:20121114T135102Z DESCRIPTION:Speaker: Phillip Sprangle\, Naval Research Lab/ University of M aryland\nTitle: Laser-Driven Particle Acceleration\nAbstract: Conventional charged particle accelerators are reaching their limit in size\, cost\, and accelerated particle energy. This talk will cover the various physical mec hanisms involved in laser-driven particle acceleration\, a leading concept for compact next generation devices. The ultra-high electric fields ( > TV/ m) associated with ultrashort\, intense laser pulses can accelerate electro ns (or ions) to high energies in extremely short distances (~ mm). In the l aser wakefield accelerator\, a laser pulse propagates in a plasma and the p onderomotive forces associated with the pulse envelop induce large amplitud e plasma waves which trap and accelerate electrons. To achieve high energie s ( > GeV) it is necessary to optically guide the laser pulse over long dis tances\, i.e.\, many Rayleigh ranges\, in a plasma channel. The physical pr ocesses involved in laser driven plasma accelerators include optical guidin g\, relativistic effects\, optical/plasma instabilities\, electron dephasin g\, and group velocity dispersion. For example\, to postpone dephasing (ele ctrons overtaking the plasma wave)\, a tapered plasma density channel can b e employed. In addition to their use in high-energy physics research\, high energy electrons can be used to generate radiation from the UV to the gamm a ray regime. The interaction of ultrashort intense laser pulses with matte r can also generate high energy ions ( > 100 MeV). The U. of Md. laser driv en acceleration program will be discussed. LAST-MODIFIED:20230127T203441Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090408T200000Z DTEND:20090408T213000Z DTSTAMP:20260828T094430Z UID:a0lqe4iunebq9keb3t1p1m6b8s@google.com CREATED:20090403T154553Z DESCRIPTION:Title: The Interplay of Long-lived Charged Particles and Hidden Sectors\nSpeaker: Dr. Matthew Strassler\, Rutgers University LAST-MODIFIED:20230127T203127Z LOCATION:Physics Building\, Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091123T210000Z DTEND:20091123T223000Z DTSTAMP:20260828T094430Z UID:1nuioqum3ibocj4v2ggue41d4o@google.com CREATED:20091116T142803Z DESCRIPTION:Title : Water\, Water Everywhere . . . Even in Amyloid Fibrils? \nSpeaker Name: Professor Robin Hochstrasser\nSpeaker Institution : Univers ity of Pennsylvania\nNotes: Refreshments at 3:45pm\n LAST-MODIFIED:20230127T203123Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230213T213000Z DTEND:20230213T223000Z DTSTAMP:20260828T094430Z UID:04vrvgd6qhrecqhh51i1vn3vu3@google.com CREATED:20221128T194108Z DESCRIPTION:Title: \;Modern Faraday Rotation Studies to Prob e the Solar Wind

    Speaker: \;Jason Kooi\, \;Naval Research Laboratory

    Abstract: \;For decades\, observations of Faraday rotation have provided unique insig hts into the plasma density and magnetic field structure of the solar wind. Faraday rotation (FR) is the rotation of the plane of polarization when li nearly polarized radiation propagates through a magnetized plasma\, such as the solar corona\, coronal mass ejection (CME)\, or stream interaction reg ion. FR measurements are very versatile: they provide a deeper understandin g of the large-scale coronal magnetic field over a range of heliocentric di stances (especially ~1.5 to 20 solar radii) not typically accessible to in situ spacecraft observations\; detection of small-timescale variations in F R can provide information on magnetic field fluctuations and magnetohydrody namic wave activity\; measurement of differential FR can be used to detect electric currents\; and new methods and new technology now make it possible for FR observations to return not only the magnitude of the magnetic field inside CMEs\, but also the full vector orientation (critical for space wea ther applications). We will discuss recent advances in coronal and CME FR o bservations as well as future applications (e.g. to enhance the scientific output of current and future NASA missions\, to develop new space weather f orecasting tools\, and to generate 3-D representations of the coronal magne tic field using FR tomography).

    Notes: Join the meeting at 4: 15 for meet and greet.  \;
    Visit https://bit.ly/2PmJoT6 to be added to the email list .
     LAST-MODIFIED:20221128T194124Z LOCATION:online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090204T190000Z DTEND:20090204T200000Z DTSTAMP:20260828T094430Z UID:nmh6enos4td2ln8lbkndrg76j8@google.com CREATED:20090202T182424Z DESCRIPTION:Title: Predicting Migration Routes with an Interacting Particle Model\nSpeaker: Dr. Alethea Barbaro\, Department of Mathematics\, UCLA LAST-MODIFIED:20230127T203258Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090325T170000Z DTEND:20090325T190000Z DTSTAMP:20260828T094430Z UID:3l66eeoh07650k2t1644t56d9c@google.com CREATED:20090128T163126Z DESCRIPTION:Title: In a Muon's Lifetime: From Fermi's Constant to "Calibrat ing" the Sun\nSpeaker: Peter Winter\, Univ. of Illinois at Urbana-Champaign LAST-MODIFIED:20230127T203602Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121116T193000Z DTEND:20121116T210000Z DTSTAMP:20260828T094430Z UID:vak6ufgi1feme95o8dna7as2ms@google.com CREATED:20121026T192024Z DESCRIPTION:Speaker Name: Professor Attilio Stella\n\nSpeaker Institution : University of Padua\, Italy\n\nTitle: Scaling Approach to Financial Modeli ng\n\nAbstract: Anomalous scaling is a well established stylized fact in finance. However\, its validity for sampled densities of aggregated asset r eturns over time intervals of various durations has limited forecasting pow er. It only provides a precise link between unconditioned densities at any two different durations. In this talk I will show that one can use scalin g for conditioned forecasting: ideas inspired by the renormalization group allow to infer from the scaling properties of the aggregated return the joi nt probability density of its elementary components. In this construction\, which is at the basis of a novel modeling of asset dynamics\, one is led t o introduce both endogenous and exogenous mechanisms driving the market\, i n a way which allows them to be distinguished in the analysis of specific t ime series. This leads in particular to the determination of an endogenous volatility.\n After reviewing the main mathematical developments and som e connections with other models\, I will discuss some specific applications \, dealing with both high and low frequency data. These will include the de scription of after-shock Omori regimes\, trading strategies\, and option pr icing.\n\n LAST-MODIFIED:20230127T203401Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090402T130000Z DTEND:20090402T220000Z DTSTAMP:20260828T094430Z UID:eisagk8uocv530edrtv4kdaqp0@google.com CREATED:20090401T184227Z DESCRIPTION:Title: Shedding Light on Dark Matter\nMore Information: Organiz ed by Maryland Center for Fundamental Physics\, Department of Astronomy & C enter for Scientific Computing and Mathematical Modeling\nSpeaker and Insti tution:\nHoward A. Baer University of Oklahoma\nSarah Eno University of Ma ryland\nDouglas Finkbeiner Harvard University\nMarla Geha Yale University \nRiccardo Giovanelli Cornell University\nCarter Hall University of Maryla nd\nKara Hoffman IceCube\, University of Maryland\nDan Hooper Fermilab\nM anoj Kaplinghat University of California\, Irvine\nAndrey Katz University of Maryland\nSavvas Koushiappas Brown University\nAndrey Kravtsov Universit y of Chicago\nAlex Kusenko UCLA\nAdam Lidz Harvard University/ University o f Pennsylvania\nStacy McGaugh University of Maryland\nRachel Kuzio de Naray University of California\, Irvine\nMassimo Ricotti University of Maryland \nEun-Suk Seo University of Maryland\nLouie Strigari Stanford University\nD avid Thompson Goddard SFC\nRosemary Wyse Johns Hopkins University\n\nlink: http://www.cscamm.umd.edu/programs/ndm09/ LAST-MODIFIED:20230127T203727Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Shedding Light on Dark Matter Workshop TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090212T190000Z DTEND:20090212T200000Z DTSTAMP:20260828T094430Z UID:snk6c11hqape1n89nmtfdmdsjg@google.com CREATED:20090206T154501Z DESCRIPTION:Title: Spin Effects in Gravitational Waveforms from Inspirallin g Black Hole Binaries\nSpeaker: Evan Ochsner\, University of Maryland LAST-MODIFIED:20230127T203834Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100909T140000 DTEND;TZID=America/New_York:20100909T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20100909T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] Experimental and computational evidence for the s+/- pa iring symmetry in Fe-based superconductors\n[Speaker] Igor Mazin\n[Institut ion] Naval Research Laboratory\n[Abstract] I will first review the basic th eoretical arguments that led to the so-called s+/- symmetry being predicted well before any experimental indications. I will discuss possible roles of phonons and of spin fluctuations\, including possibility of electron-phono n coupling enhancement through magnetoelastic effects. Next I will list neg ative experimental evidence and argue that triplet pairing and d-wave pairi ng can be with a good degree of confidence excluded. Lastly\, I will addres s the issue of distinguishing between the s+/- and a conventional s++ state s\, in terms of already existing and potential experiments. While the quest ion of nodal vs. nodeless superconductivity is not immediately related to t he s+/- vs. s++ choice\, I will also discuss the fact that gap nodes seem t o exist in some\, but not the others\, Fe-based superconductors\, and possi ble locations and theoretical mechanisms for the gap nodes.\n[Note] Refresh ment is served at 1:30pm in the lobby of Physics Building. LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120311T003000Z DTEND:20120311T013000Z DTSTAMP:20260828T094430Z UID:ua6gpf04ofv2h5cn9mg5d6l6p0@google.com CREATED:20110818T203859Z DESCRIPTION:Delve into demonstrations of color\, color mixing and color vis ion. See non-spectral colors ---colors that are not in the rainbow! Observe the Land Effect and be amazed by “greener than green!”\n\nDoors open 7:00P M\nFor directions and further information call 301-405-6045 or visit www.ph ysics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203526Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Color TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221011T170000Z DTEND:20221011T180000Z DTSTAMP:20260828T094430Z UID:5g55kn4897h9bq2h6c2c2ls7eq@google.com CREATED:20220929T135925Z LAST-MODIFIED:20220929T135925Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131121T190000Z DTEND:20131121T203000Z DTSTAMP:20260828T094430Z UID:b6b0antkpjj6gvaj6kf4irs780@google.com CREATED:20131024T155810Z DESCRIPTION:Speaker: Louis Taillefer\, Universite de Sherbrooke\n\nTitle: The Two Mysteries of Superconductivity \n\nAbstract: Superconductivity is a most remarkable property of matter\, whereby electrons enter spontaneous ly a state of macroscopic quantum coherence in which electricity flows\nper fectly. Were this state sustainable at room temperature\, our technological world would be profoundly transformed. The most promising materials are th e copper oxides that remain superconducting halfway to room temperature. B ut two long-standing puzzles have prevented scientists from understanding h ow this maximal temperature might be raised. The first is an enigmatic stat e called the pseudogap phase\, which coexists with superconductivity and ma y compete with it. The second is the nature of the glue that binds electron s into Cooper pairs to form coherent superconductivity. In my talk\, I will discuss recent experimental discoveries and present fresh ideas that shed new light on these two mysteries.\n\nHost: Johnpierre Paglione LAST-MODIFIED:20230127T203813Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090730T143000Z DTEND:20090730T153000Z DTSTAMP:20260828T094430Z UID:a4k3i3nchoh20nnfkrlk20enak@google.com CREATED:20090724T150832Z DESCRIPTION:Title: A Multiscale View of the Solar Atmosphere\n \n Speaker:D r. Peter T. Gallagher\, Trinity College Dublin\, Ireland LAST-MODIFIED:20230127T203713Z LOCATION:A.V. Williams Building\, Room 2120 SEQUENCE:6 STATUS:CONFIRMED SUMMARY:C V L S E M I N A R TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120913T180000Z DTEND:20120913T193000Z DTSTAMP:20260828T094430Z UID:aghknne9391lu6c5oskn4p0cag@google.com CREATED:20120907T184555Z DESCRIPTION:Speaker: Dr Jason Kestner\, UMBC\n\nTitle: Controlling Quantum Dot Spin Qubits\n\nAbstract: The prospect of a practical quantum computer continues to \ntantalize physicists with dreams of substantial speed-ups ov er \nconventional computers in some tasks. Many different routes are being \nexplored in the race towards this goal\, each with its own set of \nstren gths and weaknesses. Laterally gated semiconductor quantum dot spin \nqubit systems are remarkable for their combination of potential \nscalability an d long coherence times\, but suffer from imprecise control \ndue to charge noise and nuclear spin fluctuations. In this talk I will \ndiscuss protocol s recently developed to dramatically reduce different \ntypes of gate error s. This opens the door to qubit manipulation with \nerror rates below the q uantum error correction threshold.\n\n LAST-MODIFIED:20230127T203830Z LOCATION:Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120514T190000Z DTEND:20120514T200000Z DTSTAMP:20260828T094430Z UID:n7udqcpvhouc54mrvfjri4nm7o@google.com CREATED:20120511T191822Z DESCRIPTION:Title: The fluid dynamics of Earth's core: forces to reckon wit h\nSpeaker: Eric King\, Miller Fellow\, University of California\, Berkeley \nAbstract: Earth's magnetic field is generated by turbulent motions within the\nvast ocean of liquid metal that constitutes our planet's outer core\, \nin a process known as dynamo action. Unfortunately\, observations of\ncor e dynamics are largely obscured by the mantle. What observations\nwe have made indicate that the geodynamo is a physically rich system\,\nwhere compl ex interactions between turbulent flow\, planetary rotation\,\nand the magn etic field itself are commonplace\, yet poorly understood.\nI will discuss how we can use theory\, experiments\, and simulations to\nstudy the fundame ntal fluid dynamics of Earth's core.\n\nIn particular\, I examine the role of rotation (Coriolis force) and\nmagnetic fields (Lorentz force) on the fl uid dynamics of core models.\nThe results are surprising. The influence of rotation\, which extends\nthroughout the system\, is controlled by microsco pic layers of fluid at\nthe system's boundaries. The magnetic field\, thoug ht to exert a\nparamount force on core flow\, is rather modestly influentia l in\ngeodynamo simulations. The mechanisms behind both of these results\n challenge longstanding conventions in geodynamo theory. LAST-MODIFIED:20230127T203911Z LOCATION:Room 1130 of the Plant Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar: Eric King TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110127T160000Z DTEND:20110127T173000Z DTSTAMP:20260828T094430Z UID:4np9nv2gf3uvjhp15vtt6t0kn4@google.com CREATED:20110112T155226Z DESCRIPTION:CANCELED\nTitle : Entanglement measures in quasi-2D quantum Hal l states\nSpeaker Name: John Biddle\nSpeaker Institution : University of Ma ryland LAST-MODIFIED:20230127T203642Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar - CANCELED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221205T190000Z DTEND:20221205T200000Z DTSTAMP:20260828T094430Z UID:3ngdhbbp4ov0cngbe1gin5a161@google.com CREATED:20221130T144924Z DESCRIPTION:Speaker: Dr. Hong-Zhou Ye\, Columbia University

    Title:&n bsp\;Quantitativ e Materials Science with Quantum Chemistry



     LAST-MODIFIED:20221130T144924Z LOCATION:Biology - Psychology Building\, Room 1243 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121128T193000Z DTEND:20121128T203000Z DTSTAMP:20260828T094430Z UID:no8r3uabtp3qddudmlp00be07s@google.com CREATED:20120911T195137Z DESCRIPTION:SPEAKER: Tod Strohmayer - Goddard Space Flight Center\, Greenb elt MD\nTITLE: X-ray Probes of Neutron Stars and Nuclear Physics\nABSTRACT: Fundamental nuclear physics questions have important implications for\nthe interior structure of neutron stars and many of their macroscopic\npropert ies. For example\, the maximum mass and spin rate of a neutron\nstar are se t by the still-uncertain dense matter equation of state\n(EOS)\, while its radius is largely determined by the nuclear symmetry\nenergy. Thermonuclear burning on accreting neutron stars in X-ray\nbinaries leads to a rich obse rvational phenomenology that can in\nprinciple both constrain nuclear proce sses as well as provide probes\nof the neutron stars themselves. I will pro vide an overview of recent\nX-ray spectral and fast timing observations of accreting neutron stars\nand show how they can be used to constrain neutron star structure and\naspects of fundamental nuclear physics such as the EOS . I will also\nprovide a brief summary of future prospects for the next gen eration of\nX-ray observatories. LAST-MODIFIED:20230127T203003Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221005T170000Z DTEND:20221005T180000Z DTSTAMP:20260828T094430Z UID:4ghjadmg49hb9nn7n6ikt5jtj5@google.com CREATED:20220930T014110Z DESCRIPTION:Title:  Remote State Preparation (Part II)
    Speaker:  Atul Ma ntri (QuICS)
    Time:  Wednesday\, October 5\, 2022 - 1:00pm
    Location:   ATL 3100A and Virtual Via Zoom: https://u md.zoom.us/j/96508005344

    Remote state preparation (RSP) has beco me an essential subroutine to '\;'\;dequantize'\;'\; the quantu m channel in various quantum cryptographic schemes. Some of the application s of RSP include proofs of quantumness\, delegated quantum computations\, q uantum money\, unclonable quantum encryption\, quantum copy protection and more. In this talk\, we will talk about security aspects and some of these applications.  LAST-MODIFIED:20220930T014110Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Atul Mantri TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101012T200000Z DTEND:20101012T210000Z DTSTAMP:20260828T094430Z UID:83jbi1h74c8b1qe6mhgcct9mmc@google.com CREATED:20100825T174549Z DESCRIPTION:Speaker: Bernd Surrow\, Massachusetts Institute of Technology\n Title: TBA LAST-MODIFIED:20230127T203020Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131104T160000Z DTEND:20131104T173000Z DTSTAMP:20260828T094430Z UID:pn970glh9a9mludoq8bpr2umts@google.com CLASS:PUBLIC CREATED:20130823T174518Z DESCRIPTION:Institution: MIT LAST-MODIFIED:20230127T203200Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Ray Ashoori TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090416T180000Z DTEND:20090416T190000Z DTSTAMP:20260828T094430Z UID:dafpmh5acbo9b1a7a5tpsdmiqg@google.com CREATED:20090408T181828Z DESCRIPTION:Title: Using black hole perturbation theory to understand extre me mass ratio inspirals\nSpeaker: Pranesh A. Sundararajan\, Massachusetts I nstitute of Technology \nMore Information: Abstract: Extreme mass ratio ins pirals (EMRIs)\, where stellar mass compact objects (1-100 M_sun) spiral in to massive black holes (106-108 M_sun) at the centers of galaxies are parti cularly interesting sources of gravitational waves. I will present some rec ent developments in modeling EMRIs using black hole perturbation theory. We now have a toolkit that can model the inspiral trajectory and gravitationa l waveforms from EMRIs. I will also present some recent estimates of recoil velocities from supermassive black hole mergers using perturbation theory. LAST-MODIFIED:20230127T203558Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111128T200000Z DTEND:20111128T210000Z DTSTAMP:20260828T094430Z UID:44785v8eoha1g0vk1g6ub23kd8@google.com CREATED:20111122T165618Z DESCRIPTION:Title: "Effective Theory of a Light Dilaton"\nSpeaker: Rashmish Mishra\nInstitution: University of Maryland LAST-MODIFIED:20230127T203807Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111003T180000Z DTEND:20111003T213000Z DTSTAMP:20260828T094430Z UID:d9ql8cbdf23nkvasfb1qav2ib8@google.com CREATED:20110912T131850Z DESCRIPTION:Title: CMTC Fall Symposium\nMore Info: http://www.physics.umd. edu/cmtc/seminars.html LAST-MODIFIED:20230127T203339Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Fall Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110415T170000Z DTEND:20110415T180000Z DTSTAMP:20260828T094430Z UID:dfvevkvllsum8mksj8j8nj40ck@google.com CREATED:20110303T134317Z DESCRIPTION:Title : Materials Seminar: Bottom-Up Novel Hybrid Nanostructure s for Solar Energy Harvesting\nSpeaker Name: Shenqiang Ren\nSpeaker Institu tion : Massachusetts Institute of Technology\nAbstract : Nanostructured mat erials – including atomic clusters\, quantum dots\, nanowires or nanotubes – have dimensions in the range of 1 to 100 nm\, the length scale that offer s size-tunable and unique properties. They provide solutions to some of the current challenges in solar cells – Power from the Sun – that contribute t o our future energy needs\, and would potentially lead to high efficiency s olar cells at low cost. A challenging task in this area is to manipulate na nostructured materials and assemble them into desired structural forms – on e\, two or three-dimensional structures – so that their unique photoelectri c properties can be harvested. Among the bottom-up strategies\, self-assemb ly of nanostructured materials and organic conjugated polymers provides a p romising route to precise control of nanomorphology and build-up of complex systems for solar electricity production.\n\nIn this talk\, I will discuss my research on rational design of self-assembling nanostructured photovolt aic systems combined with the development of “synthetic” strategies. Specif ically\, I will focus on three main topics: (a) bridging quantum dots and c onjugated polymer nanowires for efficient (>4%) hybrid solar cells\; the da ta provides a unique new insight into the operation of hybrid bulk heteroju nction solar cells and provides directions to further improvements\; (b) dr ying mediated self-assembly of inorganic nanowire hybrid solar cell\; prosp ects for further enhancement will be discussed\; (c) self-assembly of all c onjugated block copolymers combined with metal oxide. The key aim of this s tudy is to develop a better understanding of the parameters that control su ch interfacial charge transfer processes. Another critical aim of this work is to develop quantitative structure-function relationships that can be us ed to guide the design and development of efficient nanostructu\n\nred orga nic-inorganic hybrid solar cells. LAST-MODIFIED:20230127T203710Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101206T190000Z DTEND:20101206T200000Z DTSTAMP:20260828T094430Z UID:s7g5sfd045os33fb2484k960q4@google.com CREATED:20101130T174401Z DESCRIPTION:Title: Redirecting HIV-1 Integration\nSpeaker: Dr. Stephen Hugh es\nHIV Drug Resistance Program\nNational Cancer Institute\nNCI-Frederick\n Abstract: One of the primary goals of the project is to obtain a better und erstanding of chomatin structure/organization using HIV-1 DNA integration a s a probe. The link to bioinformatics is that the analysis requires that we analyze thousands of independent integrations relative to known features o f the genome and to gene expression. In the future\, we expect to have muc h larger datasets of integration sites to work with. The first paper was r ecently published:\nFerris\, A.L.\, Wu\, X.\, Hughes\, C.M.\, Stewart\, C.\ , Smith\, S.J.\, Milne\, T.A.\, Wang\, G.G.\, Shun\, M.-C.\, Allis\, C.D.\, Engelman\, A.\, and Hughes\, S.H. (2010) Lens epithelium-derived growth factor fusion proteins redirect HIV-1 DNA integration. Proc. Natl. Acad. S ci. USA 107: 3135-3140. LAST-MODIFIED:20230127T202932Z LOCATION:Kim Engineering Building\, Room 1105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:University of Maryland National Cancer Institute Cancer Technology Partnership Fall 2010 Colloquia Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221004T170000Z DTEND:20221004T180000Z DTSTAMP:20260828T094430Z UID:14afn46adedjd9f9kh6cfvkams@google.com CREATED:20220920T114048Z LAST-MODIFIED:20220920T114048Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100419T110000 DTEND;TZID=America/New_York:20100419T123000 RRULE:FREQ=DAILY;WKST=SU;UNTIL=20100423T150000Z DTSTAMP:20260828T094430Z UID:863p3045uja2kpd15v5rpr5pa8@google.com CREATED:00010101T000000Z DESCRIPTION:[Lecturer] Benjamin Stamm\n[Institution] Division of Applied Ma thematics\,\nScientific Computing Group\, Brown University\n[Description] P arametrized Partial Differential Equations (PDEs) arise in many \nfields of engineering and computational science. Solving the PDEs for a fixed parame ter value is well studied and analyzed in most cases. The computational com plexity is unnecessary high while solving for a large number of parameter v alues in a many-query \ncontext for optimization problems\, model calibrati on\, inverse problems\, etc. This mini-course gives an introduction to the \nReduced Basis Method (RBM)\, which is designed to solve such problems eff iciently for a large number of parameter values.\n[Organizers] Ricardo H. N ochetto (MATH and IPST)\, Manuel Tiglio (PHYS and CSCAMM) LAST-MODIFIED:20230127T203622Z LOCATION:4102 Physics Building SEQUENCE:6 STATUS:CONFIRMED SUMMARY:AN INTRODUCTION TO THE REDUCED BASIS METHOD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090429T200000Z DTEND:20090429T213000Z DTSTAMP:20260828T094430Z UID:rtqhc6a80oufnup0vd5ktr6lq8@google.com CREATED:20090427T152037Z DESCRIPTION:Title: "A Forward-Backward Asymmetry in Top Quark Pair-Producti on?"\nSpeaker: Dr. Dan Amidei\, University of Michigan/CDF LAST-MODIFIED:20230127T203833Z LOCATION:Physics Building\, Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy/Astrophysics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090211T203000Z DTEND:20090211T213000Z DTSTAMP:20260828T094430Z UID:eqb80i714cq7taimtiddr4jbr4@google.com CREATED:20090129T211815Z DESCRIPTION:Title: "Nanostructured Materials for Molecular Sensing and Ther moelectrics"\nSpeaker: Oded Rabin\, University of Maryland\, Mat. Sci. & En g\, IREAP LAST-MODIFIED:20230127T203655Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111004T160000Z DTEND:20111004T170000Z DTSTAMP:20260828T094430Z UID:mbm4enoepdika9hmn074i9eqc4@google.com CREATED:20110919T201256Z DESCRIPTION:Title: Opportunities for Scientific Partnership with the Air Fo rce Office of\nScientific Research\nSpeaker: Dr. Riq Parra\, Air Force Offi ce of Scientific Research\n LAST-MODIFIED:20230127T203641Z LOCATION: IREAP large conference room (Rm 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Electromagnetics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090327T170000Z DTEND:20090327T180000Z DTSTAMP:20260828T094430Z UID:7eru0g0jfm54vpp2m397toepug@google.com CREATED:20090324T153047Z DESCRIPTION:Title: High Power Electrode Materials for Li-ion Batteries\nSpe aker: Prof. Chunsheng Wang\, Department of Chemical and Biomolecular Engine ering\,\nUniversity of Maryland LAST-MODIFIED:20230127T203052Z LOCATION:Rm. 2108\, Chemical and Nuclear Engineering Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:MATERIALS SCIENCE AND ENGINEERING SEMINAR SERIES TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221027T180000Z DTEND:20221027T193000Z DTSTAMP:20260828T094430Z UID:3ie9o74gkie724cgars7ne1jr9@google.com CREATED:20220920T190442Z DESCRIPTION:

    Title: Probing quantum materials with cQED

    Abstract: Mesoscopic and low-dimensional materials represent one of the frontiers in the study of unconventional superconductivity. Owing to th eir small size\, these materials are challenging to probe using many conven tional measurement techniques\, and require new experimental probes to succ essfully characterize. In this talk\, we introduce one such probe which ena bles us to measure the superfluid density of micron-size superconductors us ing microwave techniques drawn from circuit quantum electrodynamics (cQED). We apply this technique to a well-studied system\, the superconductor/ferro magnet bilayer\, where we find evidence for anisotropic induced superconduc tivity. \;

    Host: Richard Greene
     \;
    In-Person Location: To ll Physics Rm 1201

    Zoom \;Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

    Refreshments 1:30pm 1117 Toll Physics Bl dg. LAST-MODIFIED:20221024T170448Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM - Nicholas R. Poniatowski\, Harvard University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 27_Nicholas R. Poniatowski.pdf;FMTTYPE=a pplication/pdf:https://drive.google.com/open?id=1fUSPSb7AfyOYpzMY-TAQxzNyaG lCvE1f&authuser=0 END:VEVENT BEGIN:VEVENT DTSTART:20101018T171500Z DTEND:20101018T210000Z DTSTAMP:20260828T094430Z UID:28mmuq6tlsip8r18ok71htj1i8@google.com CREATED:20101005T131731Z DESCRIPTION:MODERN BIOPHYSICS OF THE CELL\nSpeakers and Titles\nJonathon H oward\, Professor and Director\nMax Planck Institute of Molecular Cell Biol ogy\nand Genetics\, Dresden\, Germany\n"Single-Molecule Studies of Kinesin Motors: Walking\, pushing\, depolymerizing and jamming"\nVladimir I. Gelfan d\, Leslie B. Arey Professor\nDepartment of Cell and Molecular Biology\nFei nberg School of Medicine\, Northwestern\nUniversity\, Chicago\, Illinois\n" Microtubule Motors: Moving on moving tracks"\nStanislas Leibler\, Gladys T. Perkin Professor\nThe Rockefeller University\, New York\nand Professor\, I nstitute for Advanced Study\nPrinceton\, New Jersey\n"On Microscopes and Mi crobes:\nThoughts on microbial population dynamics" LAST-MODIFIED:20230127T203908Z LOCATION:Marker Room\, Dept. of Chemistry and Biochemistry SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RUSSELL MARKER SYMPOSIUM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221003T150000Z DTEND:20221003T161500Z DTSTAMP:20260828T094430Z UID:3h0gp2tkfk1i8e1uv2l926dh2b@google.com CREATED:20220922T170255Z DESCRIPTION:Sam \;Gralla&nb sp\;from the University of Arizona (formerly\, an Einstein postdoctoral fel low at UMD) is visiting \;UMD the week of Oct 3. He will be giving the inaugural Misner Lecture in Gravitational Physics titled "Black Holes: Seeing the Unseeable" \;on October 4th\, 4-5pm.

    https://science.u md.edu/events/misner-2022.html

    Sam has also kindly agreed to give a set of more technical lectures titled "Minicourse on Black Hole Imaging".


    This set of three lectures is aimed at students and r esearchers looking to learn more about black hole imaging. \; They assu me a working knowledge of physics at the advanced undergraduate level\, but are otherwise agnostic to background. \; I do not assume any knowledge of general relativity\, but relativists will find useful information in fo otnotes and appendices [in the lecture notes that will be made available].< blockquote>Lecture 1: Monday\, October 3\, 11:00-12:15 in PSC 3150&n bsp\; (coffee and light snacks will be provided)

     \;  \; &nb sp\; \;Theory: Observational appearance of sources near black holes< br>

    Lecture 2: Wednesday\, October 5\, 10:00-11:15 in PSC 315 0 \; (coffee and light snacks will be provided)

     \; &nbs p\;  \; \;Experiment: Interferometry and the EHT measurements


    Lecture 3: Friday\, October 7\, 12:00-1:15 in PSC 21 36 \; (sandwiches\, etc. will be provided)

     \;  \; & nbsp\; \;The Future: Photon ring and precision gravity

    So me questions I hope to answer (or lead you to your own answers!):
    * How should we interpret the famous "black hole image"?
    * What do the measure ments teach us about accretion or gravity?
    * What will we learn with fut ure measurements?     LAST-MODIFIED:20220930T235330Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Black Hole Imaging TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120206T173000Z DTEND:20120206T183000Z DTSTAMP:20260828T094430Z UID:fk37on1v5c9ujuq3bhe2rsde14@google.com CREATED:20120126T205303Z DESCRIPTION:Title: Exploiting the quantum vacuum—from Casimir forces to im proved solar energy conversion\nSpeaker: Jeremy N. Munday\, Department of E lectrical and Computer Engineering and Institute for Research in Electronic s and Applied Physics\, University of Maryland\, College Park\, MD 20742\nA bstract: The interaction of light and matter is pervasive and governs many physical processes from atomic transitions to optoelectronic devices. As d evice dimensions become comparable to the wavelength of visible light\, bot h quantum effects and optical waveguiding become important. In this talk\, I will present our research related to nanoscale optics\, quantum mechanics \, and photovoltaics. First\, I will discuss the Casimir force\, which resu lts from the quantum mechanical behavior of light fields in vacuum. I will describe experiments in which we tailored this interaction between solid ma terials to achieve both attractive and repulsive nanoscale forces. Second\, I will discuss the role of optical dispersion and the density of optical s tates in improving the absorption characteristics of photovoltaic devices t hrough enhanced light confinement. Finally\, perspectives on controlling ra diative emission to improve solar energy conversion will be discussed.\n\nB io: Jeremy Munday is currently an assistant professor at the University of Maryland\, College Park. He received is PhD in Physics from Harvard in 2008 \, under the supervision of Federico Capasso\, and his BS in Physics and As tronomy from Middle Tennessee State University in 2003. Before coming to Ma ryland\, he worked at Caltech with Harry Atwater on plasmonics and photovol taic devices.\n\n LAST-MODIFIED:20230127T203445Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Jeremy Munday TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100322T203000Z DTEND:20100322T213000Z DTSTAMP:20260828T094430Z UID:ktec4v3e5ff6pfqsbpup6mg1l4@google.com CREATED:20100302T143024Z DESCRIPTION:Title : Bursts of Magnetic Reconnection: the signatures of Flux Transfer Events on the Earth's dayside and flank magnetopause\nSpeaker Nam e: David Sibeck\nSpeaker Institution : NASA Goddard Space Flight Center\nAb stract : Flux transfer events can be identified in the vicinity of the days ide magnetopause on the basis of counterstreaming magnetosheath and magneto spheric particle populations\, magnetic field strength enhancements\, bipol ar magnetic field signatures normal to the nominal magnetopause\, and accel erated flows\, all signatures of magnetic reconnection. However\, the main factor leading to their interpretation in terms of magnetic reconnection i s the fact that they tend to occur for southward interplanetary magnetic fi eld (IMF) orientations. By contrast\, events with similar characteristics s how no preference for occurance for southward IMF orientations on the magne totail flanks. We review previous efforts to reconcile these results and p resent a new explanation that generates FTEs along a tilted subsolar compon ent reconnection line\, tracks their antisunward motion\, and uses the ambi ent magnetosheath and magnetospheric magnetic fields to determine the pertu rbations that they generate in the surrounding media. Predicted event ampl itudes\, motion orientations\, and locations agree well with those determin ed from Interball-1 and Cluster observations. LAST-MODIFIED:20230127T203728Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100224T211500Z DTEND:20100224T221500Z DTSTAMP:20260828T094430Z UID:tg88ttmuscel63bjk8r3oretkk@google.com CREATED:20100215T201644Z DESCRIPTION:SPEAKER: Andrea Pocar\n\nAFFILIATION: Univ of Massachusetts\n\n TOPIC: Solar Neutrino Science with Borexino\n\nABSTRACT: Borexino is a sol ar neutrino experiment running at the Gran Sasso underground\nlaboratories in central Italy. A large\, ultra-low background liquid scintillator detect or\, it has\nrecently made the first direct observation of Be-7 solar neutr inos\, which constitute about\n10% of the solar neutrino output. The measur ed Be-7 neutrino flux with Borexino provides\na further confirmation of neu trino oscillations and paves the way to precision solar neutrino\nmeasureme nts below the energy barrier of natural radioactivity. The Borexino physics \nprogram includes the measurement of a large fraction of the solar neutrin o energy\nspectrum to further test the MSW-LMA solar neutrino oscillation s olution and study\nsubdominant solar neutrino fluxes. Due to its unpreceden ted radiological purity\, Borexino\nis also sensitive to antineutrinos of t errestrial origin and to neutrinos produced in\nsupernovae explosions in ou r galaxy. The talk will present the current status and future\nscience prog ram of Borexino and illustrate some of the technical successes that have\nm ade the experiment possible. LAST-MODIFIED:20230127T202936Z LOCATION:Physics Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nucl Phys/HEP/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081120T190000Z DTEND:20081120T203000Z DTSTAMP:20260828T094430Z UID:5fk5lrq39tdctnm866pq9fu1lo@google.com CREATED:20081117T202912Z DESCRIPTION:Title: Quantum Transport and Its Classical Limit\nSpeaker: Prof essor Piet Brouwer\, Cornell University\n LAST-MODIFIED:20230127T203048Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20090316 DTEND;VALUE=DATE:20090321 DTSTAMP:20260828T094430Z UID:cqkqqpq98sptmfoq6butpbe22g@google.com CREATED:20090202T185048Z LAST-MODIFIED:20230127T203100Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Spring Break TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090305T190000Z DTEND:20090305T203000Z DTSTAMP:20260828T094430Z UID:16fhq9l304jfosrva9oto38fvo@google.com CREATED:20090202T174149Z DESCRIPTION:Title: The Nano-Optics of Surface Plasmon Polaritons\, and thei r Applications in Cloaking and Microscopy\nSpeaker: Professor Christopher C . Davis\, University of Maryland\n LAST-MODIFIED:20230127T202942Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121108T173000Z DTEND:20121108T183000Z DTSTAMP:20260828T094430Z UID:fd6hrrcqgi28ch45it100pip6s@google.com CREATED:20121102T140743Z DESCRIPTION:Title: Soft Matter: From Grains to Cells\nSpeaker: Kerstin Nord strom\nUniversity of Maryland \nIREAP LAST-MODIFIED:20230127T203309Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121203T160000 DTEND;TZID=America/New_York:20121203T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121203T160000 CREATED:20120904T140915Z DESCRIPTION:SPEAKER: Sharon Rozovsky\,\nUniversity of Delaware \n \nTITLE : "77Se NMR of selenoproteins" LAST-MODIFIED:20230127T203255Z LOCATION:BIOSCIENCE RESEARCH BLDG 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120503T163000Z DTEND:20120503T173000Z DTSTAMP:20260828T094430Z UID:jcq4ttlmfg36m11rfiham3kad8@google.com CREATED:20120423T141422Z DESCRIPTION:"Tunable Spin-Dependent Charge Transport Through Magnetic Nanow ires"\nDr. Sergio Picozzi\nDepartment of Physics\, American University LAST-MODIFIED:20230127T203144Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110223T210000Z DTEND:20110223T223000Z DTSTAMP:20260828T094430Z UID:4gnedu5hqrjtav5lm82sc5o7ik@google.com CREATED:20110216T201806Z DESCRIPTION:Title : The MINOS Experiment\, Results and Future Plans\nSpeake r Name: Prof. Jennifer Thomas\nSpeaker Institution : University of Texas at Austin\nAbstract : The MINOS Experiment has been taking data in the NuMI b eam at FNAL for 5 years and has the world's most precise measurements of a number of neutrino parameters. I will summarise the status of the MINOS re sults and talk about the near term plans for the next few years. LAST-MODIFIED:20230127T203706Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091006T171500Z DTEND:20091006T183000Z DTSTAMP:20260828T094430Z UID:otvk4dg7uemkiq82791mmd61p0@google.com CREATED:20090929T144403Z DESCRIPTION:Title : Application of Load-Dependent Chemical Reactions: Biolo gical Friction and Cell Mechanosensation.\nSpeaker Name: Sam Walcott\nSpeak er Institution : Department of Mechanical Engineering\, Johns Hopkins\nNote s: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 about five minute s after 12:00 (Noon). LAST-MODIFIED:20230127T203735Z LOCATION:1116\, IPST Bldg. Bldg. #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080916T143000Z DTEND:20080916T153000Z DTSTAMP:20260828T094430Z UID:re35iig5ij7c75g82bd8sh64dk@google.com CREATED:20080912T155919Z DESCRIPTION:Speaker:Mkrtych Khudaverdyan\, Institute of Applied Physics\, B onn\, Germany\nTitle:"Towards quantum information processing using single n eutral atoms"\n LAST-MODIFIED:20230127T203208Z LOCATION:Building 217\, Room: H107 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNST NANOFABRICATION RESEARCH GROUP SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121126T160000 DTEND;TZID=America/New_York:20121126T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121126T160000 CREATED:20120904T140915Z DESCRIPTION:Title : Dissecting the Forces that Contribute to Cooperativity in the Folding of Repeat Proteins.\n\nSpeaker Name: Doug Barrick\n\nSpeaker Institution : Johns Hopkins LAST-MODIFIED:20230127T203255Z LOCATION:Room 1103\, Bioscience Research Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091013T171500Z DTEND:20091013T183000Z DTSTAMP:20260828T094430Z UID:viuaaitii9srko5jmq797ehdck@google.com CREATED:20091005T134020Z DESCRIPTION:Title : Control Theory Under the Microscope: Guiding the Motion of Synthetic \nMolecular Machines.\nSpeaker Name: Professor Christopher Ja rzynski\nSpeaker Institution : University of Maryland\nNotes: As in the pas t\, each seminar will be preceded by an Informal Cafeteria Lunch to which a ll are welcome\, departing from Room 1108 about five minutes after 12:00 (N oon)\n LAST-MODIFIED:20230127T203757Z LOCATION:Room 0112\, Marker Seminar Room\, Chemistry Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120918T143000Z DTEND:20120918T153000Z DTSTAMP:20260828T094430Z UID:menk1vmkqhtqedhlaqlumsqnqs@google.com CREATED:20120904T201637Z DESCRIPTION:SPEAKER: Mark Alford - Washington University in St. Louis \nTI TLE: How to understand superfluids using field theory\nABSTRACT: The hydro dynamic description of a superfluid at non-zero temperature is\nthe two-flu id model\, where the two fluids are the superfluid and a normal fluid. The superfluid is a Bose-Einstein condensate\, and the normal fluid is a therma l gas of phonons.\n\nI will show how one can translate between the macrosco pic two-fluid model and a microscopic field theoretic description\, using t he simplest field theory that can show Bose-Einstein condensation\, namely the complex scalar field.\n\nQuestions that will be answered include:\n* Ho w can one get two fluids from a single field?\n* What is the relationship b etween the different formalisms that have been proposed for relativistic su perfluids?\n* What is the role of the Goldstone boson? LAST-MODIFIED:20230127T203723Z LOCATION:Physics Rm 2202 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101208T193000Z DTEND:20101208T210000Z DTSTAMP:20260828T094430Z UID:o3btnhr0m8kolbjjkeki6r5cag@google.com CREATED:20100908T190132Z DESCRIPTION:SPEAKER: Erich Poppitz\nAFFILIATION: University of Toronto\, Canada\nTOPIC: Lattice Chirality: A mission (im)possible?\nABSTRACT: Afte r reviewing why the study of nonperturbative chiral gauge dynamics may be o f interest and how Ginsparg-Wilson fermions\nrealize exact lattice chiral s ymmetries\, I will summarize the difficulties faced by attempts to formulat e chiral gauge theories on the lattice. I will then argue that decoupling t he mirror fermions from a vector-like theory\, in a "strong-coupling symmet ric phase\," may\nhelp. I will compare our proposal with previous attempts along these lines\, discuss its status and prospects for the future.\n\n LAST-MODIFIED:20230127T203750Z LOCATION:Physics 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110203T170000Z DTEND:20110203T180000Z DTSTAMP:20260828T094430Z UID:ecvhb67453tdl8mu76rbqgjg14@google.com CREATED:20110128T160023Z DESCRIPTION:Title: “Cytoskeletal control of membrane dynamics in normal tra fficking and during EHEC pathogenesis.” \nSpeaker: Dr. Campellone\, Matt W elch’s Lab in the Department of Molecular and Cell Biology at UC Berkeley.\ n\nBelow is a short bio:\n\nDr. Campellone performed his graduate work in J ohn Leong’s Lab in the Department of Molecular Genetics and Microbiology at UMass Medical School. He is currently a postdoctoral fellow in Matt Welch’ s Lab in the Department of Molecular and Cell Biology at UC Berkeley.\nHis research goals are to understand how mammalian cells control the organizati on\, shape\, and\nmovement of membranes during normal trafficking processes and in the context of host pathogen interactions. In particular\, he is st udying how the actin and microtubule cytoskeletons\nfunction during membran e dynamics\, intracellular transport\, and secretion of collagen\, and how\ ncytoskeletal assembly\, membrane remodeling\, and transit through the secr etory pathway is\naltered upon infection with E.coli O157:H.\n\nLight refre shments will be served. LAST-MODIFIED:20230127T203858Z LOCATION:#1103 the Bioscience Research Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cell Biology and Molecular Genetics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090831T190000Z DTEND:20090831T200000Z DTSTAMP:20260828T094430Z UID:dtboq1t2bduch9ch0q11qcmge4@google.com CREATED:20090825T205827Z DESCRIPTION:Title : Yukawa couplings in models with gauge\, Higgs and matte r unification\nSpeaker Name: Yukihiro Mimura\, University of Maryland\nAbst ract: In orbifold models\, gauge\, Higgs and the matter fields can be unifi ed in one multiplet\nfrom the compactification of higher dimensional supers ymmetric gauge theory.\nWe study how three families of chiral fermions can be unified in the gauge multiplet.\nThe bulk gauge interaction includes the Yukawa interactions to generate masses for\nquarks and leptons after the e lectroweak symmetry is broken.\nThe bulk Yukawa interaction has global or g auged flavor symmetry originating from the\nR symmetry or bulk gauge symmet ry\, and the Yukawa structure is restricted.\nWhen the global and gauged fl avor symmetries are broken by orbifold compactification\,\nthe remaining ga uge symmetry which contains the standard model gauge symmetry is restricted .\nThe restrictions from the bulk flavor symmetries can provide explanation s of fermion mass hierarchy. LAST-MODIFIED:20230127T203143Z LOCATION:4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131014T150000Z DTEND:20131014T163000Z DTSTAMP:20260828T094430Z UID:n035u88cf184ikq2q3fjt3cfjc@google.com CREATED:20130904T182407Z DESCRIPTION:CANCELLED LAST-MODIFIED:20230127T203724Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221213T181500Z DTEND:20221213T191500Z DTSTAMP:20260828T094430Z UID:5a0hu0e29vc6a3b5u8nj86g119@google.com CREATED:20220927T131857Z LAST-MODIFIED:20220927T131857Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101206T210000Z DTEND:20101206T220000Z DTSTAMP:20260828T094430Z UID:scu4bgk9st4aifoj9a4oggas2s@google.com CREATED:20101130T141150Z DESCRIPTION:Speaker: Vitali Tugarinov\, University of Maryland\nTitle: " Advanced Isotope Labeling Techniques for NMR Studies of Protein Structure a nd Dynamics" LAST-MODIFIED:20230127T203349Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221017T203000Z DTEND:20221017T213000Z DTSTAMP:20260828T094430Z UID:6i5imjbc7hqgijb0mj20fjlld9@google.com CREATED:20220914T150750Z DESCRIPTION:Title: \;Time variations of comic ray par ticles measured by AMS

    Speaker: \;Yi Jia\, \;MIT

    Abstract: \;The Alpha Magnetic Spectrometer (AMS) is a multi-purpose hi gh energy particle detector which was installed on the International Space Station (ISS) on May 19\, 2011 to conduct a unique long-term mission of fun damental physics research in space. The detailed measurement of the daily e lectron\, positron\, proton\, and helium fluxes based on ten-year data with the AMS will be presented. All the fluxes exhibit variations on different time scales. These results provide unique input to the understanding of cos mic rays in the heliosphere.

    Recording of the talk

    Notes: Join the meeting at 4:15 for meet and greet
    Visit https://bit.ly/2PmJoT6 for access.
     LAST-MODIFIED:20221024T230100Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100408T140000 DTEND;TZID=America/New_York:20100408T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com RECURRENCE-ID;TZID=America/New_York:20100408T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Saw-Wai Hla\n[Institution] Ohio University\n[Title] "STM Manipulation of Charge\, Spin\, and Conformation of Atoms and Molecule s "\n[Abstract] Scanning tunneling microscope (STM) manipulation of single atoms and molecules on surfaces allow construction of artificial structures on an atom-by-atom basis and demonstration of single molecule devices on a one molecule at-a-time basis. STM is not only an instrument used to ‘see’ individual atoms by means of imaging\, but also a tool used to ‘touch’ and ‘take’ atoms and molecules or to ‘hear’ their vibration by manipulations. T herefore\, STM can be considered as the ‘eyes’\, ‘hands’ and ‘ears’ of the scientists connecting our macroscopic world to the exciting world of atoms and molecules. \nIn our research projects\, we combine a variety of STM man ipulation schemes with tunneling spectroscopy techniques to investigate pro perties of atoms and molecules on surfaces. This talk will include our rece nt achievements: In spintronic research area\, we will demonstrate that not only manipulation of magnetic atoms can be done but also imaging of their spin directions is possible by using a magnetic STM tip. In superconductivi ty area\, we will present the smallest molecular superconductor ever study to date. Here\, the finding of superconductivity in just four pairs of (BET S)2-GaCl4 molecules not only provides the possibility of investigating this phenomenon locally\, but also opens potential applications in nanoelectron ics. In molecular device area\, single molecule switches and molecular roto rs operated by injecting tunneling electrons from an STM tip will be presen ted. These experiments are innovative\, and are tailored to address several critical issues covering both for basic science\, and for demonstration of novel atomic and molecular devices.\n[Notes] Refreshment is serviced at 1: 30pm in the Toll Room\n LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221206T160000 DTEND;TZID=America/New_York:20221206T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221206T160000 CREATED:20210423T130624Z DESCRIPTION:
    Pauline Gagnon\, Indiana University
    < br>The Tragic Destiny of Mileva Marić Einstein

    What we re Albert Einstein's first wife’s contributions to his extraordinary produc tivity in the first years of his career? A first biography of Mileva Marić Einstein was published in Serbian in 1969 but remained largely unknown desp ite being translated first in German\, then in French in the 1990’s. The pu blication of Mileva and Albert’s love letters in 1987 revealed how they liv ed together while two recent publications shed more light on Mileva Marić’s life and work. I will review this evidence in its social and historical co ntext to give a better idea of her contributions. In this presentation\, I avoid all type of speculation and do not attack Albert Einstein personally\ , but rather strictly stick to facts. The audience will be able to apprecia te why such a talented physicist has been so unkindly treated by history.
     \;
    If you missed the colloquium\, you can hear Dr. Gagnon speak on the topic here:
    https://v ideo.ethz.ch/speakers/zurich_physics_colloquium/194e9e0d-205e-4ec8-b62b-f58 78f4342c7.html
    LAST-MODIFIED:20221207T203649Z LOCATION:1410 Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101122T213000Z DTEND:20101122T223000Z DTSTAMP:20260828T094430Z UID:839jkagelgl2151np5pgmpen6k@google.com CREATED:20100916T140000Z DESCRIPTION:Title : Is the Magnetic Field in the Outer Heliosphere Laminar? \nSpeaker Name: M. Opher\nSpeaker Institution : George Mason University\nAb stract : Much of our current understanding of the edge of the solar system is being challenged with recent observations of missions such as Voyager an d IBEX. The current global models of the heliosphere are based on the assum ption that the magnetic field in the outer heliosheath close to the heliopa use is laminar. In this talk we argue that in the outer heliosheath the hel iospheric magnetic field is not laminar but instead consists of nested magn etic islands. We discuss the implications of these ideas to the global stru cture of the heliosphere and to observations. Recently\, we proposed (Drake et al. 2009) that the annihilation of the ``sectored'' magnetic field with in the heliosheath as it is compressed on its approach to the heliopause pr oduces the anomalous cosmic rays (ACRs) and also energetic electrons. As a product of the annihilation of the sectored magnetic field\, densly-packed magnetic islands are produced. These magnetic islands will be convected wi th the ambient \n\nflows as the sector boundary is carried to higher latitu des filling the outer heliosheath. We further argue that the magnetic islan ds will develop upstream (but still within the heliosheath) where collision less reconnection is unfavorable -- large perturbations of the sector struc ture near the heliopause will cause compressions of the current sheet upstr eam\, triggering reconnection. As a result\, the magnetic field in the heli osheath sector region will be disordered well upstream of the heliopause. W e present a 3D MHD simulation with unprecedent numerical resolution that ca ptures the sector boundary. We show that due to the high pressure of the in terstellar magnetic field the disordered sectored region fills a large port ion of the northern part of the heliosphere with a smaller extension in the southern hemisphere. We test these ideas with observations of energetic e lectrons\, which because of their high velocity are most sensitive to the s tructure of the magnetic field. We !\n\nsu\nggest that within our scenario we can explain two significant ano\nies in the observations of energetic el ectrons in the outer heliosphere: the sudden decrease in the intensity of l ow energy electrons (0.02-1.5MeV) from the LECP instrument on Voyager 2 in 2008 and the dramatic differences in intensity trends between Galactic Cos mic Ray Electrons (3.8-59MeV) at Voyager 1 and 2 (McDonald 2010). We argue that these observations are a consequence of Voyager 2 leaving the sector r egion of disordered field in mid 2008 and crossing into a region of unipola r laminar field.\n LAST-MODIFIED:20230127T203523Z LOCATION:CSS 2400 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110503T200000Z DTEND:20110503T210000Z DTSTAMP:20260828T094430Z UID:aa3fq6onmv2e20o24kjo7uk288@google.com CREATED:20110427T144822Z DESCRIPTION:Speaker: Douglas Scalapino\, University of California\, Santa B arbara\nTitle: A Common Thread: Spin-fluctuation Pairing \nAbstract: This year marks the 100th anniversary of Kamerlingh Onnes' discovery of superco nductivity\, and it is roughly fifty years since Bardeen\, Cooper and Schri effer explained this phenomena as arising from the condensation of electron pairs. For a variety of superconductors ranging from Hg and Pb to Nb3SN an d MgB2 the exchange of phonons (ionic lattice- fluctuations) underlies the pairing mechanism. However\, following the discoveries of superconductivit y in the heavy fermions by F. Steglich et al. and the organic Bechgaard sal ts by D. Jerome et al.\, it was suggested that electronic spin-fluctuations could provide an alternative pairing mechanism. Here\, based on the exper imental phenomenology and theoretical studies\, I will argue that spin-fluc tuation mediated pairing is the common thread linking the occurrence of sup erconductivity in a wide class of systems including heavy-fermion\, some or ganics \, the Pu actinides \, the cuprates as well as the recently discover ed Fe-pnictide/chalcogens.\n\nSupport by the Center for Nanophase Material s Science at ORNL\, DOE LAST-MODIFIED:20230127T203226Z LOCATION:Rm 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Carr Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110127T180000Z DTEND:20110127T190000Z DTSTAMP:20260828T094430Z UID:8drreqnb2i3f5vrrs7vpi92b9g@google.com CREATED:20110111T184153Z DESCRIPTION:Special Energy Seminar: Sivula on Materials for Solar Energy Co nversion (This event has no end time in the Engineering Calendar. An hour long event duration has been set to work with Google Calendar.) LAST-MODIFIED:20230127T203518Z LOCATION:Pepco Room\, Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Energy Seminar: Sivula on Materials for Solar Energy Conver sion TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090902T160000Z DTEND:20090902T173000Z DTSTAMP:20260828T094430Z UID:0i3s3ml3eua9bnnkqjuelkrq6c@google.com CREATED:20090901T130755Z DESCRIPTION:Speaker: Joe Formaggio\, Massachusetts Inst. of Technology\nTit le: Neutrino Mass\, Relic Neutrinos and Other Holy Grails\nAbstract: The di rect observation of the relic neutrinos from the cosmic big bang has been a long and outstanding question in the fields of neutrino physics and cosmol ogy. Laboratory measurements of both the neutrino mass and the relic neutri no density can provide strong validation of our Standard Models of physics and cosmology. Though the direct detection of relic neutrinos has been elus ive for many years\, there does exist a nuclear channel by which their dete ction is possible: neutrino capture. In this talk\, I will discuss relic n eutrino detection via neutrino capture from an experimentalist point-of-vie w\; highlighting both the challenges of such a measurement as well as its p otential goals. LAST-MODIFIED:20230127T203639Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220920T160000 DTEND;TZID=America/New_York:20220920T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20220920T160000 CREATED:20210423T130624Z DESCRIPTION:Anson Hook\, University of Maryland
     \;
    Par ticle Physics in the Sky : From Theory to Experiment and Back
    &nb sp\;
    We present two examples of how searches for underlying principl es interface with exciting new CMB and gravitational wave experiments.  \; First\, the quantization of electric charge leads us to consider axion s trings that have an Aharonov-Bohm-like effect on the CMB photons. \; Th is polarization rotation leads in turn to a novel experimental \;analys is. \; Second\, if a stochastic gravitational wave signal were to be di scovered\, an analysis of the frequency spectrum would allow us to measure the free streaming fraction and equation of state of the early universe and \, surprisingly\, even the beta function of QCD at high energies. \;&nb sp\;

    1410 John S. Toll Physics Building LAST-MODIFIED:20220916T123112Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100203T173000Z DTEND:20100203T190000Z DTSTAMP:20260828T094430Z UID:f8ib9cjse9pabmmfmu33ghbri0@google.com CREATED:20100114T191411Z DESCRIPTION:SPEAKER: Lucas Platter\n\nAFFILIATION: Univ of Washington - IN T\, Seattle\n\nTITLE: Towards Ab-initio Density Functional Theory\n\nABSTR ACT: The correct description of heavy nuclei is an extraordinary challenge to\nnuclear theory. Such systems are not only relevant to nuclear astrophys ics but they should also be considered as an ideal testing ground for moder n nuclear Hamiltonians derived from effective field theory. Density Functio nal Theory is one tool that can be used to calculate the properties of heav y nuclei. However\, the (Skyrme) functionals currently used within this fra mework are neither related to our microscopic understanding of the nuclear interaction nor are they able to describe nuclei far from the line of stabi lity. I will discuss recent work which aims at a microscopic derivation of a density functional based on a combination of many-body\nperturbation theo ry and low-momentum interactions. Furthermore\, I will outline which topics will be addressed in the near future.\n LAST-MODIFIED:20230127T203010Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100920T203000Z DTEND:20100920T213000Z DTSTAMP:20260828T094430Z UID:0bt1nnddmkblfdo228096adhks@google.com CREATED:20100909T171502Z DESCRIPTION:Title : Comparing White Light Images from STEREO with in Situ M easurements of the Solar Wind during the Recent Solar Minimum\nSpeaker Name : Alexis Rouillard\nSpeaker Institution : Naval Research Laboratory\nAbstra ct : The STEREO mission allows detailed comparisons of white light images o f the solar wind (SECCHI experiment) with in situ measurements (ACE\, WIND or STEREO) to be performed. We will review the recent results of such compa risons. They confirm that the location\, orientation and topology of the ma gnetic field inside Coronal Mass Ejections (CMEs) largely dictate the aspec t of CMEs in white light images. The standard solar indices such as the sun spot number and the flare indices suggest that there was remarkably little solar activity during the recent solar minimum. However\, the eruption of C MEs never ceased during the last three years\; in particular several format ions of Merged Interaction Regions (MIRs) have been detected in SECCHI imag es and in situ measurements of the solar wind. Many solar transients in the form of CMEs\, streamer blowouts\, pinch-offs\, or blobs can erupt success ively and interact before they reach 1 AU. This continual streamer activity \, albeit largely\n\n reduced compared to solar maximum years\, manifests i tself in white light images and in situ measurements as the frequent entrai nment of transients by fast solar wind streams and the coalescence of compl ex ejecta. These STEREO observations provide new insights into the variabil ity of the slow solar wind\, the evolution of the coronal magnetic field an d the modulation of galactic comic rays during an extended period of very l ow solar activity.\n LAST-MODIFIED:20230127T203031Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111004T171500Z DTEND:20111004T183000Z DTSTAMP:20260828T094430Z UID:uape0ga7n9rl0vq6i1gb1s4l4k@google.com CREATED:20110928T155400Z DESCRIPTION:Title : Hyper-Transport in Potentials that are Random in Space and Time.\nSpeaker Name: Dr. Shmuel Fishman\nSpeaker Institution : UMCP LAST-MODIFIED:20230127T203913Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:INFORMAL STATISTICAL PHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230127T170000Z DTEND:20230127T180000Z DTSTAMP:20260828T094430Z UID:29uet6uqafo5rsq6r4co1k113t@google.com CREATED:20230125T154244Z DESCRIPTION:Speaker: Eleanor Crane (JQI/UMD)

    Title:  “Bosonic Qiskit: Qubit-boson quantum circuits for simulating lattice ga uge theories”

    Pizza and drinks will be ser ved after the seminar LAST-MODIFIED:20230126T142023Z LOCATION:ATL 3332 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Eleanor Crane (UMD) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091209T180000Z DTEND:20091209T190000Z DTSTAMP:20260828T094430Z UID:s4l0l9q0dcb9p3bivg0j4o2414@google.com CLASS:PUBLIC CREATED:20091030T140756Z DESCRIPTION:Title: The Large N Limit of Four-Dimensional Yang-Mills Field Coupled to Adjoint Fermions on a Single Site Lattice \nSpeaker: Rajamani Narayanan\nInstitution: Florida International Univ.\, Miami\n\nAbstract: W e consider the large N limit of four-dimensional SU(N) Yang-Mills field cou pled to adjoint fermions on a single site lattice. We use perturbative tech niques to show that the center-symmetries are broken with naive fermions bu t they are not broken with overlap fermions. We use numerical techniques to support this result. We also present evidence for a non-zero chiral conden sate for one and two Majorana flavors at one value of the lattice gauge cou pling.\n LAST-MODIFIED:20230127T203520Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091211T160000Z DTEND:20091211T170000Z DTSTAMP:20260828T094430Z UID:o6m48lphg8cchvf3bjm5echnk0@google.com CREATED:20091117T184504Z DESCRIPTION:Title: Generative Models for Image Analysis\nSpeaker: Stuart Ge man\nDivision of Applied Mathematics\nBrown University\nProvidence\, Rhode Island 02912 \nABSTRACT: A probabilistic grammar for the grouping and label ing of parts and objects\, when taken together with pose and part-dependent appearance models\, constitutes a generative scene model and a Bayesian fr amework for image analysis. To the extent that the generative model generat es features\, as opposed to pixel intensities\, the posterior distribution (i.e. the conditional distribution on part and object labels given the imag e) is based on incomplete information\; feature vectors are generally insuf ficient to recover the original intensities. I will propose a way to learn pixel-level models for the appearances of parts. I will demonstrate the uti lity of the models with some experiments in Bayesian image classification.\ n LAST-MODIFIED:20230127T203627Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series on Vision TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101207T181500Z DTEND:20101207T193000Z DTSTAMP:20260828T094430Z UID:g3nm7lk5p29v1rh74878b8c4ec@google.com CREATED:20101104T142051Z DESCRIPTION:Title : "Fluctuations arising from non-conservative forces in o ptical traps"\nSpeaker Name: Professor Arthur LaPorta\nSpeaker Institution : University of Maryland\, College Park\n LAST-MODIFIED:20230127T203859Z LOCATION:Rm 1116 IPST Building 085 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221025T183000Z DTEND:20221025T200000Z DTSTAMP:20260828T094430Z UID:7hhi3atfrooig3s3u780rh87gt@google.com CREATED:20221021T174752Z DESCRIPTION:Konstantin Springmann\, TUM


    Title: How W hite Dwarfs probe light QCD axions

    Abstract: Light QCD axions can ge t destabilized in sufficiently dense and large objects such as white dwarfs . Once the axion is sourced the mass of nucleons within the star is reduced leading to a new ground state of nuclear matter. I will show that white dw arfs in this absolutely stable phase of matter would have to look very diff erent from what is observed allowing us to set novel and strong constraints in unexplored axion parameter space.     LAST-MODIFIED:20221024T141510Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221026T150000Z DTEND:20221026T160000Z DTSTAMP:20260828T094430Z UID:459l1vug1n18o7b5l5453i79vo@google.com CREATED:20220804T154802Z DESCRIPTION:Speaker: Dr. David Long\, NIST

    Title: New Approaches to Optical Spectroscopy: From Satellites to Combs to Microse nsors

    Abstract: \;I will discuss our recent work t owards novel methods for optical spectroscopy. These efforts include a vari ety ultrasensitive\, cavity-enhanced methods in support of global greenhous e gas remote sensing. In addition\, I will discuss approaches for the gener ation of optical frequency combs and their use in a wide range of applicati ons including molecular and atomic spectroscopy as well as physical metrolo gy. Finally\, I will describe the use of these combs to interrogate optomec hanical sensors for high accuracy\, chip-scale accelerometry. \; \;
    LAST-MODIFIED:20221020T202935Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091021T170000Z DTEND:20091021T183000Z DTSTAMP:20260828T094430Z UID:h1ho2vj2ioajtmo0lc4oolbjjk@google.com CREATED:20090928T190812Z DESCRIPTION:Title : The Baryon Resonance Spectrum and the 1/Nc Expansion\nS peaker Name: Richard Lebed\nSpeaker Institution : Arizona State University\ , Tempe\nNotes: And a special note to my friends at College Park: This talk summarizes the many papers written in collaboration with Tom Cohen\, our s tudents\, and postdocs.\nAbstract : Why do baryon resonance multiplets exis t\, and what controls their formation and decays? It is natural to conside r them as merely excited states of some three-quark or meson-nucleon potent ial. But these are just simplistic quantum-mechanical pictures that recogni ze neither the full field-theoretical complexities of QCD nor the extremely brief lifetimes of resonances due to quark pair production. Both of these issues are addressed by the 1/Nc expansion of QCD\, where Nc is the number of color charges. Constraints arising at large Nc on meson-baryon scatterin g amplitudes not only create linear relationships between them\, thus linki ng distinct partial waves and their embedded resonances\, but also restrict the possible resonant decay channels. I present strong experimental evide nce in favor of this approach\, describe the multiplet structure that it pr edicts\, and show how to perform the analysis beyond the strict large Nc li mit by incorporating 1/Nc-suppressed effects.\n \nThis program has been dev eloped to the point that now one possesses a full effective field theory fo rmalism for physics in the baryon resonance region. LAST-MODIFIED:20230127T203505Z LOCATION:2202 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111022T233000Z DTEND:20111023T003000Z DTSTAMP:20260828T094430Z UID:m0l9q7c4ksmaog36scpki8d3l0@google.com CREATED:20110818T203129Z DESCRIPTION:\nCome see illusions and magic tricks involving physics. Observ e illusions with flat and curved mirrors (including anamorphic art)\; impos sible figures such as Schroeder’s staircase\; and finally mirages. \n\nDoor s open 7:00PM\nFor directions and further information call 301-405-6045 or visit www.physics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203402Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun – Illusions TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111214T200000Z DTEND:20111214T210000Z DTSTAMP:20260828T094430Z UID:crkmhmns5b1t40d9nh8h1rn0i8@google.com CREATED:20111202T153219Z DESCRIPTION:Title: Theory of Slow Non-Equilibrium Dynamics in Amorphous Sol ids at Low Temperature\nSpeaker: Dr. Alexander Burin\, Department of Chemis try\, Tulane University\nAbstract: The non-equilibrium dynamics of amorphou s solids induced by the DC field application is considered. We show that lo garithmically slow dynamics observed by Osheroff and coworkers can be inter preted as a consequence of TLS interaction reducing their density of states . The TLS non-equilibrium dielectric losses in the non-linear regime are di scussed.\n LAST-MODIFIED:20230127T203338Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Park \, MD 20740 301-935-6400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120208T200000Z DTEND:20120208T210000Z DTSTAMP:20260828T094430Z UID:peg2eba563l5u5u71hgfbbvkrg@google.com CREATED:20120201T151810Z DESCRIPTION:Title: Coherent Anti-Stokes Raman Scattering (CARS) for High-Sp eed\, Label-Free Imaging\nSpeaker: Dr. Charles Camp\, National Institute of Standards and Technology LAST-MODIFIED:20230127T203622Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Park \, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221007T160000Z DTEND:20221007T171500Z DTSTAMP:20260828T094430Z UID:0sais08d2d960gsv42kb1e95p0@google.com CREATED:20220922T170445Z DESCRIPTION:Sam&nbs p\;Gralla \;from the University of Arizona (formerly\, an Einstein post doctoral fellow at UMD) is visiting \;UMD the week of Oct 3. He will be giving the inaugural Misner Lecture in Gravitational Physics titled "Black Holes: Seeing the Unseeable" \;on October 4th\, 4-5 pm.

    https ://science.umd.edu/events/misner-2022.html

    Sam has also k indly agreed to give a set of more technical lectures titled "Minicourse on Black Hole Imaging".


    This set of three lectures is aimed at st udents and researchers looking to learn more about black hole imaging.  \; They assume a working knowledge of physics at the advanced undergraduate level\, but are otherwise agnostic to background. \; I do not assume a ny knowledge of general relativity\, but relativists will find useful infor mation in footnotes and appendices [in the lecture notes that will be made available].
    Lecture 1: Monday\, October 3\, 11:00-12:15 in PS C 3150 \; (coffee and light snacks will be provided)

     \;  \;  \; \;Theory: Observational appearance of sources near black holes


    Lecture 2: Wednesday\, October 5\, 10:00-11:1 5 in PSC 3150 \; (coffee and light snacks will be provided)

     \;  \;  \; \;Experiment: Interferometry and the EHT mea surements


    Lecture 3: Friday\, October 7\, 12:00-1: 15 in PSC 2136 \; (sandwiches\, etc. will be provided)

      \;  \;  \; \;The Future: Photon ring and precision gravity

    Some questions I hope to answer (or lead you to your own answers! ):
    * How should we interpret the famous "black hole image"?
    * What do the measurements teach us about accretion or gravity?
    * What will we le arn with future measurements?
     LAST-MODIFIED:20220930T235252Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Minicourse on Black Hole Imaging TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110420T200000Z DTEND:20110420T213000Z DTSTAMP:20260828T094430Z UID:v3nvcv3hbi5cg99p2cee2itjqs@google.com CREATED:20110415T191747Z DESCRIPTION:Title : "Precision Tests of Fundamental Symmetries with Ultraco ld Neutrons"\nSpeaker Name: Dr. Brad Plaster\nSpeaker Institution : Univers ity of Kentucky\n LAST-MODIFIED:20230127T203638Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110429T133000Z DTEND:20110429T150000Z DTSTAMP:20260828T094430Z UID:udtj1m0sdqgodgnpfq5k2hbiks@google.com CREATED:20110427T145433Z DESCRIPTION:Speaker: Dr. Yoran Dagan\, Raymond & Beverly Sackler School of Physics & Astronomy\, Tel-Aviv University\nTitle: Superconducting and magne tic effects at the interface between LaAlO3 and SrTiO3\n \nAbstract: The co nducting interface formed between LaAlO3 and SrTiO3\, which are both non-ma gnetic and non-conducting perovskites\, unexpectedly exhibits: two dimensio nal electron gas (2DEG) properties\, superconductivity and possibly magneti c properties. Electric field-induced metal-insulator transition was reporte d for a layer of LaAlO3 thicker than three lattice unit cells. \nHowever\, the origin of the charge carriers at the conducting layer is still under de bate.\n \nIn this talk I will describe our study of the electronic properti es of this interface. I will also discuss the various tuning knobs used in our laboratory: gate voltage\, sample size\, and strain effects. Tuning the se parameters can result in remarkable changes in the superconducting trans ition temperature\, the spin-orbit interaction strength and the magneto-tra nsport properties. Finally\, I will discuss possible applications of these interfaces.\n\n1. M. Ben Shalom et al. Phys. Rev. B 80\, 140403(R) (20 09). \n2. M. Ben Shalom et al. Phys. Rev. Lett. 104\, 126802 (2010) \ n3. M. Ben Shalom et al. Phys. Rev. Lett. 105\, 206401 (2010) \n4. D. Rakhmilevitch et al. Phys. Rev. B 82\, 235119 (2010) LAST-MODIFIED:20230127T202956Z LOCATION:CNAM Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100427T160000 DTEND;TZID=America/New_York:20100427T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100427T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Mike Naughton\, Boston College\nTitle: "A nanoco axial architecture with optical\, solar and biological utility"\nAbstract: We discuss a novel nanoscale platform offering utility in nanophotonics\,\n photovoltaics\, visual prosthetics\, and biological and chemical sensing.\n As subwavelength optical waveguides\, these nanostructures can be used in\n a range of nanoscale manipulations of light\, including optical\nnanomicros copy and lithography\, high efficiency solar cells\, high\nelectrode-densit y retinal implants and discrete optical metamaterials. A\nmodification of t he basic structure enables the fabrication of highly\nsensitive “nanocavity ” biochemical sensors and nanoscale bipolar\nneurostimulators. We will repo rt on aspects of these applications\, with\nemphasis on radial junction "na nocoax" thin film solar cells. This\nstructure allows for a unique decoupli ng of the optical and electronic\nlength scales in photovoltaic devices\, e nabling highly efficient charge\nextraction in ultrathin films with\, parad oxically\, highly efficient\nlight collection. The nanocoax thus exhibits s trong optical absorption\nacross the visible\, and state-of-the-art power c onversion efficiency\nusing photovotaics thinner than carrier (electron and hole) diffusion\nlengths\, suggesting a new path to high efficiency solar power.\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101018T190000Z DTEND:20101018T200000Z DTSTAMP:20260828T094430Z UID:ckl8l6mt6caj1bd9dkv89qtvr8@google.com CREATED:20101014T130616Z DESCRIPTION:Title of the talk: "Quantum teleportation between distant matte r quantum bits"\nSpeaker: Dr. Steve Olmschenk\, National Institute of Stand ards and Technology\n\nAbstract\n\nQuantum information processing has the p otential to revolutionize both communication and computation. Trapped atomi c ions are one of the leading candidates for applications in quantum inform ation\, due to their long trapping times\, good coherence properties\, and precise control of the atomic quantum states using microwave and laser radi ation. Integrating this quantum memory with photons (distance link) establi shes a unique path to both long-distance quantum communication\, and scalab le quantum computation. We have recently used this hybrid ion-photon system to perform a quantum gate operation between two atomic ions separated by a bout one meter\, and utilized this gate to teleport a quantum state between two atomic quantum bits with an average fidelity of 90%.\n\n\nAbout our sp eaker\n\nSteven Olmschenk received a B.S. in Mathematics and a B.A. in Phys ics with a Specialization in Astrophysics in 2004 from the University of Ch icago. He went on to graduate school at the University of Michigan\, with t he later half of his graduate research performed at the University of Maryl and. His graduate research focused on the use of trapped atomic ions for ap plications in quantum information\, and included advanced ion trap developm ent\, a heralded photon-mediated quantum gate\, and demonstration of a quan tum teleportation protocol between two distant ions. After receiving an M.S . in Physics and an M.S.E. in Electrical Engineering\, Steve graduated from the University of Michigan in 2009 with a Ph.D. in Physics. The same year he accepted a National Research Council (NRC) Postdoctoral Fellowship and s tarted doing research at the National Institute of Standards and Technology (NIST)\, where he is pursuing quantum information and simulation of comple x many-body systems with ultracold neutral atoms confined in an optical lat tice. LAST-MODIFIED:20230127T203051Z LOCATION:PHYS 4316 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UM OSA/SPIE Student Chapter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T150000Z DTEND:20220406T160000Z DTSTAMP:20260828T094430Z UID:7ngeomnp7u68lg0jg6k3ldn791@google.com CREATED:20220207T175859Z DESCRIPTION:Speaker: Dr. Joel Yuen-Zhou\, UC San Diego

    Ti tle: Polariton Chemistry: Molecules in Optical Cavities

    Abstract:&nb sp\;    Organic molecules interact strongly with confined electroma gnetic fields in plasmonic arrays or optical microcavities owing to their b right transition dipole moments. This interaction gives rise to molecular p olaritons\, hybrid light-matter quasiparticles. Molecular polaritonics open s doors for new room-temperature opportunities for the nontrivial control o f physico-chemical properties of molecular assemblies. In this talk\, I’ll showcase some of these opportunities that we have been theoretically (and\, together with our experimental collaborators) exploring in the past few ye ars. I will briefly discuss the relevant time and energy scales associated with molecular polaritons and strategies to exploit them to control photoex cited processes including singlet fission\, triplet harvesting\, remote ene rgy transfer\, and anomalous nonlinear optical effects. Finally\, I will co nclude by explaining how vibrational polaritons can steer ground-state chem ical reactions even in the absence of optical pumping\, or be used to reali ze exotic processes such as remote control of chemical reactions. LAST-MODIFIED:20230127T203528Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221024T203000Z DTEND:20221024T213000Z DTSTAMP:20260828T094430Z UID:3fpe5ti8fpfkife8aq0udd0u14@google.com CREATED:20221018T163352Z DESCRIPTION:Title: \;Recent Results from the HAWC Gamma Ray Observatory

    Speaker: \;Jordan A. Goodman\, \;Dept. of Physics\, University of Maryland

    Abstract: \;The \;High Altitude Water Cherenkov (HAWC) Ga mma-ray Observatory \;in the high mountains of M exico is giving us a new view of the TeV sky. HAWC operates 24hrs/day with over a 95% on-time and observes the entire overhead sky (~8sr over the cour se of the day). HAWC has accumulated more than seven years of data and has recently completed our “Pass 5” re-analysis giving us significant improveme nts in our low energy response\, angular resolution\, background rejection and an expanded field of view. This talk will present an overview of these recent HAWC results showing our updated sky catalog\, our view of the highe st energy gamma-ray sky (including sources above 50 and 100 TeV)\, new Micr o-quasar results\, long-term monitoring of nearby AGN and recent observatio ns of galactic Pevatrons. In addition\, we will present recent limits on pr imordial black holes\, Lorentz invariance violation and multi-messenger obs ervations\, as well as comparisons of HAWC and \;IACT \;measurements.

    Talk recording
    < br>Notes: \;Join the meeting at 4:15 for meet and gr eet.  \;Visit https://bit.ly /2PmJoT6 to be added to the email list. LAST-MODIFIED:20221024T225947Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130429T200000Z DTEND:20130429T210000Z DTSTAMP:20260828T094430Z UID:7bb5dqsrr4d4jn8uu1g26gq6ag@google.com CREATED:20130410T152440Z DESCRIPTION:Title: Qualcomm Microsystems Seminar Series\,\nEngineering Quan tum Information Processing Systems\nSpeaker: Jungsang Kim\, Associate Profe ssor\nInstitution: Electrical & Computer Engineering\, Physics and Computer Science\nDuke University\nAbstract:Utilizing unique properties of quantum physics in principle enables computational speeds unmatched by a convention al computer for an important set of problems\, and fundamentally secure com munication over long distances. On the other hand\, the practical technolog y to construct a functional\, scalable quantum computer or quantum communic ation system remains a major challenge. Trapped ion systems feature long co herence times\, high fidelity quantum logic gates\, and high quantum effici ency state detection adequate for implementation of high performance quantu m computer and quantum repeater. However\, similar to transistor technology in the early days\, we do not have a scalable technology platform on which large numbers of trapped ions can be integrated\, nor an architectural fra mework for assembling a complex functional circuit capable of executing use ful algorithms. In this work\, I will describe a systems approach to realiz ing scalable quantum information processing systems utilizing hardware tech nology available to us today\, and the integration effort currently under w ay.\n\nBiography\nJungsang Kim received his B.S. degree in Physics in 1992 from Seoul National University (SNU) in Seoul\, Korea\, and his Ph.D. in Ph ysics from Stanford University in 1999\, working on the topic of quantum op tics in semiconductor devices. He joined Bell Laboratories in Murray Hill\, New Jersey where he served as a Member of Technical Staff and a Technical Manager\, developing large-scale MEMS-based optical switches and advanced w ireless communication systems. He joined the Department of Electrical and C omputer Engineering at Duke University in 2004. His research interest lies in construction of high-performance complex systems\, including ion-trap qu antum computers\, quantum communication networks\, and high-performance ima ging systems.\n\nThis Event is For: Graduate • Undergraduate • Faculty • Po st-Docs • Alumni • Corporate LAST-MODIFIED:20230127T203716Z LOCATION:1146 A.V. Williams Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Qualcomm Microsystems Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110406T153000Z DTEND:20110406T170000Z DTSTAMP:20260828T094430Z UID:djsiq6230e7ptgudif318qt5fc@google.com CREATED:00010101T000000Z DESCRIPTION:SPEAKER: Dan Pirjol – Natl Inst for Physics & Nuclear Enginee ring\, Bucharest\n\nTITLE: Large Nc QCD and the Spin-Flavor Structure of the Quark Interactions\n\nABSTRACT: The talk will give a brief introductio n to the application of the 1/Nc expansion to excited nucleons. An alterna tive approach to the study of these states is the non-relativistic quark mo del with spin-flavor dependent quark interactions. I will present a method for connecting these two pictures\, which makes use of the permutation grou p S_N of N objects. Using the observed hierarchy of the coefficients of the 1/Nc expansion\, a test is proposed for the spin-flavor dependence of the quark interactions in the constituent quark model. I will discuss the impl ications for the two most popular models: the one-gluon exchange model\, an d the Goldstone boson exchange model.\n LAST-MODIFIED:20230127T203004Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090929T171500Z DTEND:20090929T183000Z DTSTAMP:20260828T094430Z UID:ntvjd97ui4j3phhqq5ffiajc2c@google.com CREATED:20090921T130009Z DESCRIPTION:Title : Effects of Critical Fluctuations on Asymmetric Interfac es.\nSpeaker Name: Christopher Bertrand (Speaker) and Professor Mikhail Ani simov\, University of Maryland LAST-MODIFIED:20230127T203452Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090508T170000Z DTEND:20090508T180000Z DTSTAMP:20260828T094430Z UID:57ptt40c7ot36pgtfe3qhqk9bo@google.com CREATED:20090429T193041Z DESCRIPTION:Title: Templated Titania Coatings for Flexible \nSpeaker: Prof. Dunbar P. Birnie\, III\, Rutgers University LAST-MODIFIED:20230127T203539Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110124T150000 DTEND;TZID=America/New_York:20110124T160000 RRULE:FREQ=WEEKLY;UNTIL=20110509T190000Z;BYDAY=MO DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com CREATED:00010101T000000Z DESCRIPTION:[Title] TBA\n[Speaker] TBA\n[Institution] TBA\n[Abstract] TBA LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110309T210000Z DTEND:20110309T223000Z DTSTAMP:20260828T094430Z UID:frlnbuner24iquerjp766n0428@google.com CREATED:20110304T193450Z DESCRIPTION:Title : "Search for Neutrinos from Gamma-Ray Bursts in IceCube" \nSpeaker Name: Dr. Erik Blaufuss\nSpeaker Institution : University of Mary land LAST-MODIFIED:20230127T202940Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE CATEGORIES:http://schemas.google.com/g/2005#event END:VEVENT BEGIN:VEVENT DTSTART:20221206T160000Z DTEND:20221206T170000Z DTSTAMP:20260828T094430Z UID:7p4308a75kaak0lv350arhmrjm@google.com CREATED:20221004T184055Z DESCRIPTION:When: December 6th at 11am
    Where: A TL 4402
    Speaker: Dr. Maissam Barkeshli (UMD)
    Title: Dis crete shift and quantized charge polarization: New topological invariants a nd quantized response of crystalline topological states
    Abstra ct: \;    I will describe our recent advances in understand ing how to define and calculate invariants for topological phases of matter with crystalline symmetry. These invariants define a quantized contributio n to fractional charge bound to lattice disclinations and dislocations. The y also\, as a dual response\, determine the angular and linear momentum of magnetic flux in the ground state. I will show how our invariants give\, fo r the first time since TKNN's seminal work in 1982 on quantized Hall conduc tance\, a new class of topological invariants that can be defined throughou t Hofstadter's famous butterfly. LAST-MODIFIED:20221202T142737Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC JLDS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221110T190000Z DTEND:20221110T203000Z DTSTAMP:20260828T094430Z UID:5vc3725il7jei8rlgm2e4sc7a6@google.com CREATED:20221102T143046Z DESCRIPTION:

    Title: 1D topological systems for next-generation electronics \;

    Abstract: Topological nanowires\, topological mat erials confined in one dimension (1D)\, hold great promise for robust and s calable quantum computing and low-dissipation interconnect applications\, w hich will transform current computing technologies. To do so\, research in topological nanowires must continue to improve their synthesis and properti es.

    In this talk\, I will discuss my group’s efforts to develop a hig h throughput and precision synthesis method to fabricate 1Dtopological syst ems. I will also highlight our recent studies on topological metal MoP nano wires and discuss their potential applications. Finally\, I will present ph ase transformations present in these topological systems and how to study t hem using cryo STEM.


    Host: Johnpierre Paglione
     \;
    In-pers on location: Toll Physics Rm 1201

    Zoom meeting \;Link: \;&nb sp\;https://umd.zoom.us/j/91 301075848

    Refreshments 1:30pm 111 7 Toll Physics Bldg.     LAST-MODIFIED:20221102T150309Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Judy Cha\, Cornell University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Nov 10_Judy Cha.pdf;FMTTYPE=application/pdf: https://drive.google.com/open?id=1fj7_CfEqpQ_LoJragp_hNEz24oYs52Jc&authuser =0 END:VEVENT BEGIN:VEVENT DTSTART:20111010T160000Z DTEND:20111010T163000Z DTSTAMP:20260828T094430Z UID:4qp6qcpnti3so5pep34hg0tqk0@google.com CREATED:20111003T132535Z LAST-MODIFIED:20230127T203301Z LOCATION:1305F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121010T200000Z DTEND:20121010T213000Z DTSTAMP:20260828T094430Z UID:9n2vlkb85dlk44t15j5mn88634@google.com CREATED:20121005T185500Z DESCRIPTION:Title : "New Results in the Search for Short Baseline Neutrino Oscillations in Fermilab's Booster Neutrino Beamline"\n\nSpeaker Name: Dr. Warren Huelsnitz\n\nSpeaker Institution : University of Maryland LAST-MODIFIED:20230127T203708Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100601T163000Z DTEND:20100601T180000Z DTSTAMP:20260828T094430Z UID:15a6vkjjnfidnu9ooual8g9hg0@google.com CREATED:20100521T143904Z DESCRIPTION:SPEAKER: Bruno El-Bennich\n\nAFFILIATION: ITP\, State U of Sao Paul & Univ Cruzeiro do Sul\, Brazil\n\nTITLE: Scalar Resonance Effects o n the $B_s - \\bar B_s$ Mixing Angle\n\nABSTRACT: After a brief introductio n to QCD factorization and its application to non-leptonic \nB-meson decays \, I will concentrate on hadronic (non-perturbative) effects on CP violatio n and \nother observables in these decays. Exemplarily\, I will discuss the mixing angle in $B_s$ oscillation \nwhich will be one of the priorities of the experimental flavour-physics program at LHC.\n LAST-MODIFIED:20230127T203824Z LOCATION:Physics Rm 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111027T180000Z DTEND:20111027T193000Z DTSTAMP:20260828T094430Z UID:j20euac4c8469djapmc2pntltc@google.com CREATED:20110914T203319Z DESCRIPTION:Speaker: Kyle Shen\, Cornell University\nTitle: Shedding Light on Correlated Electronic Materials\nAbstract: Angle-resolved photoemissio n spectroscopy (ARPES) has played a pivotal role in shaping our understandi ng of a range of complex materials. However\, the vast majority of material s have traditionally remained beyond the reach of photoemission spectroscop y. To overcome this barrier\, we have developed a new approach by combining an oxide molecular beam epitaxy with high-resolution photoemission (MBE-AR PES)\, allowing us to synthesize and study the electronic structure of a wi de variety of epitaxial thin films\, interfaces\, and heterostructures. I w ill describe our recent work on two material systems were we have utilized this approach. First\, epitaxial thin films of the elusive "infinite layer" cuprate Sr1-xLaxCuO2 have been studied\, allowing us to address fundamenta l issues regarding the asymmetry between doping electrons and holes in the high-Tc cuprates. Second\, oxide heterostructures of [LaMnO3]2n / [SrMnO3]n have been synthesized to explore how electronic and magnetic states can be engineered by organizing alternating blocks of LaMnO3 and SrMnO3 while kee ping the overall stoichiometry fixed. LAST-MODIFIED:20230127T203614Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091009T150000Z DTEND:20091009T160000Z DTSTAMP:20260828T094430Z UID:deokgm3u5ib7muic87q70uvbpg@google.com CREATED:20091003T000315Z DESCRIPTION:Title: Shear turbulence and precessionally driven flows in the three meter experiment\nSpeaker: Daniel Lathrop\, Departments of Physics an d Geology\, University of Maryland\nNote: The Geology Tea at 10:30am will b e held in the High Bay of Energy\nResearch so that\ncolloquium attendees ca n see the three meter system. LAST-MODIFIED:20230127T203553Z LOCATION:2324 Computer and Space Sciences Building (CSS) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Geology Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110331T113000 DTEND;TZID=America/New_York:20110331T123000 RRULE:FREQ=WEEKLY;UNTIL=20110428T153000Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:tccpsv8eudbavhddlpmpkul6rk@google.com CREATED:20110317T150721Z DESCRIPTION:Topic: "The Halo Model of Large Scale Structure in Warm Dark Ma tter Models"\nPresenter: Robyn Dunstan (UMD) LAST-MODIFIED:20230127T203703Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130124T190000Z DTEND:20130124T203000Z DTSTAMP:20260828T094430Z UID:8h7jpqb3bpocfijegj2oqoqrps@google.com CREATED:20130122T180145Z DESCRIPTION:Speaker: Nathaniel Gabor\, MIT\n\nTitle: Photoresponse in Graph ene Quantum Devices: \nHot Dirac Fermions and the Emergence of Nonlocality\ n\nAbstract: Dirac fermions\, which exhibit light-like conical band structu re with vanishing band gap\, have generated tremendous interest within the fields of condensed matter physics and nanoscience. Strongly interacting Di rac fermions\, particularly near the charge neutrality point (CNP) in graph ene\, have been the focus of intense research. As the quality of graphene-b ased quantum devices has improved\, electronic measurements have probed man y-body effects at the CNP\, revealing Coulomb drag\, nonlocality\, and inte raction-assisted band gap opening. While quantum electronic measurements pr obe charge transport of carriers at low energy\, photoexcitation may drive the system into a regime dominated by high-energy carrier interactions. In this talk\, I will discuss photoresponse measurements of graphene-based qua ntum systems that reveal a novel hot carrier transport regime\, and explore the emergence of giant nonlocality near the CNP. By combining quantum tran sport with precision optical techniques\, these measurements provide a glim pse into the strong interactions of Dirac fermions\, and establish the firs t steps in the search for correlated electron behavior in the regime of str ong light-matter interactions. \n\nHost: Ian Appelbaum\n LAST-MODIFIED:20230127T203149Z LOCATION:Physics rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium w/Nathaniel Gabor\, MIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110418T150000Z DTEND:20110418T160000Z DTSTAMP:20260828T094430Z UID:tuikrnn7d50ov4cakbi4bnfakk@google.com CREATED:20110415T132310Z DESCRIPTION:Title : Quantum liquid crystal phases and unconventional quantu m magnetism in dipolar Fermi systems\nSpeaker Name: Benjamin M Fregoso\nSpe aker Institution : U of Chicago\nAbstract : Quantum liquid crystal phases a re novel states of matter whose symmetries under rotations and translations are between those of a liquid and a crystalline solid. This concept was in troduced by Kivelson\, Fradkin and Emery about 10 years ago and recently be came clear\, that it plays an important role in physics\, e.g.\, high Tc su perconductors\, 2D electron gases. In this talk\, I show that dipolar Fermi gases develop a particular type of liquid crystal phase\, the nematic phas e\, and hence provide a clean playground for the study of strongly correlat ed electron systems. In particular\, I describe two novel phases of matter\ , the biaxial-nematic phase\, which exhibits non-Fermi liquid behavior\, an d the ferro-nematic phase which exhibits unconventional quantum magnetism.\ n LAST-MODIFIED:20230127T203531Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101027T200000Z DTEND:20101027T210000Z DTSTAMP:20260828T094430Z UID:20qe1tj3u0q2uvpqpp21se40hk@google.com CREATED:20101022T154233Z DESCRIPTION:Title : I Dream of Bottomonium: BaBar's Adventure with the Upsi lon Meson\nSpeaker Name: Dr. Stephen Sekula\nSpeaker Institution : Southern Methodist University\nAbstract : In late 2007\, the PEP-II Collider at SLA C took data for the last time at its nominal operating energy\, 10.58 GeV\, where it produced a bottom/anti-bottom-quark resonance ("bottomonium") kno wn as the Upsilon(4S) meson. The machine began a multi-stage program at di fferent energies that allowed the BaBar Experiment to collect the largest e xisting samples of Upsilon(3S) and Upsilon(2S) mesons\, and to scan in ener gy above the Upsilon(4S). The physics goals of this program were to discov er the missing states in the bottomonium system and to search for evidence of physics beyond the Standard Model of Particle Physics. I will present s ome of the latest results from this important data sample. LAST-MODIFIED:20230127T203635Z LOCATION:PHYS 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120327T160000Z DTEND:20120327T171500Z DTSTAMP:20260828T094430Z UID:i85hvqe4r7eu50nv2io1et3j40@google.com CREATED:20120220T155419Z DESCRIPTION:Title: Terahertz Sources\, Waveguides and Microscopes\nSpeaker: Prof. Alan D. Bristow\, Department of Physics\, West Virginia University\ nABSTRACT: Terahertz (THz) pulses provide time-resolved and broadband spec tral fingerprints that are useful for various applications\, which include sensing trace molecules in air\, probing interband transitions in semicondu ctor heterostructures\, measuring local conductivity\, and testing faults i n mass-produced circuitry. While the growth of THz time-domain spectroscop y has been impressive\, further advances require that several technological and scientific hurdles be overcome. In this talk\, I will report on (1) T Hz sources that are convenient for pumping by inexpensive and compact fiber lasers and (2) waveguiding in novel semiconductor-core optical fibers. T he first topic will address the power- and wavelength-dependent generation of THz by optical rectification in chalcopyrite crystals\, such as ZnGeP2 ( ZGP)\, which have 42m symmetry and are consequently birefringent. The seco nd topic will address the characterization\, coupling\, transmission and ab sorption in silicon and silica layers of the waveguiding structures\, which promise to be a flexible and high-throughput alternative to metal-waveguid es. Finally\, a pulsed THz microscope will be proposed based on these tech nologies. LAST-MODIFIED:20230127T203446Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081106T173000Z DTEND:20081106T183000Z DTSTAMP:20260828T094430Z UID:ccrfpf77kpbp5l5daj7melilrc@google.com CREATED:20081027T155202Z DESCRIPTION:Speaker: Wim van Saarloos\, Director\, Lorenz Center\, Univers ity of Twente\, Holland\nTitle: A general approach to front propagation in to unstable states\n LAST-MODIFIED:20230127T203737Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121012T170000Z DTEND:20121012T180000Z DTSTAMP:20260828T094430Z UID:bephj09p5qf8qvn20r88km2ouc@google.com CREATED:20121005T172405Z DESCRIPTION:Title: Non-ergodic dynamics of economic models\nSpeaker: Dr. Ol e Peters\nLondon Mathematical Laboratory\n\n**NOTE SPECIAL TIME**\nNO pizza will be served\n LAST-MODIFIED:20230127T203344Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130925T140000Z DTEND:20130925T210000Z DTSTAMP:20260828T094430Z UID:fcq6ggh731bg8hdh9bm9o7m3a0@google.com CREATED:20130923T172428Z DESCRIPTION:The Baltimore Chapter of IEEE Electron Devices and Solid-State Circuits is co-hosting a very interesting one day Colloquium on Sensor Devi ces on Wednesday\, September 25th 10:00 AM - 5:00 PM at University of MD St amp Union Building\, Benjamin Banneker Room (Room 2212).\nAttendance is fr ee\, but please just send an email to these two email addresses if you thin k it is likely you can attend some or any of the talks throughout the day s o that we might obtain a head count: Dr. Naresh C. Das (naresh.c.das2.civ@m ail.mil)\, Dr. Victor Veliadis (victor.veliadis@ngc.com)\nhttps://meetings. vtools.ieee.org/meeting_view/list_meeting/19799\nList of speakers and talks :\n10:10-10:30 AM - Dr. Philip Perconti\, Overview of sensor research progr ams at Army Research Laboratory (ARL)\n10:30-11:10 AM - Prof. M. Alam\, Pur due University - How to Break the "Fundamental" Limits of Nanobiosensing\n1 1:10-11:30 AM - Dr. Parvez Uppal\, ARL\, IR focal plane array sensor resear ch at ARL\n11:30 AM - 12:10 PM - Prof. Mark Reed\, Yale University - INTEGR ATED ELECTRONIC LABEL-FREE BIOSENSING ASSAYS\n12:10-1:10 PM Lunch break\nSe ssion II: Chair - Dr. Victor Veliadis\, Northrop Grumman Corporation\n1:10 PM-1:40 PM - Dr. Anupama Kaul/ NSF and JPL-Caltech\, Revisiting layered mat erials in the nano-age: the promise of transition metal di-chalcogenides an d other 2D-layered materials for nanoelectronics\, sensing and photonics ap plications\n1:40 -2:20 PM Prof. Michael Shur\, RPI\, Terahertz Sensing Tech nology\n2:20 - 3:00 PM Prof. Agis Iliadis\, Univ. of Maryland at College Pa rk- Topics to be announced\n3:00 -3:30 P -Coffee break\nSession III: Chair - Dr. Pankaj Shah\, Army research Laboratory\n3:30- 4:10 Dr. Herbett Bennet t\, NIST- Standards Ecosystem for Nano- and Macro-Manufacturing: Key Compon ents in the Bridge from R&D to Commercialization of Sensors\n4:10 - 4:40 Dr . Fan\, Towards diamond based Alpha Voltaic Energy Source\nWebsite: http:/ /ewh.ieee.org/r2/baltimore/edssc/ LAST-MODIFIED:20230127T203637Z LOCATION:Stamp Union Building\, Benjamin Banneker Room (Room 2212). SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquium on Sensor Devices TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110721T190000Z DTEND:20110721T200000Z DTSTAMP:20260828T094430Z UID:96ppoun5ab8mug7c5f5246oejk@google.com CREATED:20110715T181121Z DESCRIPTION:SPEAKER: Huseyin Kocak\, University of Miami\nTALK TITLE: Jupit er's belts\, our ozone hole\, and Elliptic Lagrangian Coherent Structures \ nABSTRACT: Jupiter's quite stable belts and our ozone hole can both be mode led as Lagrangian Coherent Structures (LCS) of elliptic type in incompressi ble\ntwo-dimensional fluid flows. Elliptic LCS are material fluid curves th at do not experience exponential stretching and folding over a finite-time interval. \nElliptic LCS inhibit mixing. A vivid example of an elliptic LCS in a geophysical fluid flow system is that one at the perimeter of the aus tral stratospheric\npolar vortex. Such an elliptic LCS prevents ozone-deple ted air from spreading toward lower latitudes\, leading to the formation of the so-called ozone \nhole. I will also discuss a theory that provides sup port for their occurrence. It is related to the Kolmogorov--Arnold--Moser t heory for time-quasiperiodic \none-degree-of-freedom Hamiltonian systems fo r which the frequency mapping is degenerate in the Kolmogorov sense. This t alk is the result of several \nyears of collaboration with oceanographers a t the University of Miami's Rosenstiel School of Marine and Atmospheric Sci ence (Francisco Beron-Vera\, \nMichael Brown\, and Mara Olascoaga). LAST-MODIFIED:20230127T203651Z LOCATION:Mathematics Building\, Colloquium Room 3206 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL COLLOQUIUM - (In Honor of Dr. Yorke's Birthday) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100204T190000Z DTEND:20100204T203000Z DTSTAMP:20260828T094430Z UID:pg6v2qtjhf93j1co3ldq5mptg0@google.com CREATED:20100126T140600Z DESCRIPTION:[Speaker] Kirill Shtengel\n[Institution] University of Californ ia\, Riverside\n[Title] Non-Abelian Anyons\, Quasiparticle Interferometry\n and Topological Quantum Computation\n[Abstract] States of matter are conven tionally classified according to broken symmetries. Topologically ordered p hases fall outside of this paradigm: with no local order parameter\, they n evertheless have many peculiar properties setting them apart from disordere d phases. In 2D\, such\nphases may support anyons - quasiparticles that are neither bosons nor fermions. Moreover\, anyons with non-Abelian statistics can occur\, particularly in the fractional quantum Hall regime. In this ta lk\, I will focus on solid state interferometers designed to detect such ex otic statistics. I\nwill discuss recent experiments in the the quantum Hall regime at 5/2 filling where the evidence for the existence of non-Abelian anyons may have in fact been observed for the first time. Interesting in th eir own right\, such systems may also provide a platform for topological qu antum computation.\nQuasiparticle interferometers will then become one of t he key elements in such quantum computing schemes\; I will address their po tential applications in this context.\n[Note] Followed by refreshment at 1: 30pm in room 1204. LAST-MODIFIED:20230127T203825Z LOCATION:PHYS 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111026T200000Z DTEND:20111026T213000Z DTSTAMP:20260828T094430Z UID:mshmge0keshutt114fuo223d90@google.com CREATED:20111021T181938Z DESCRIPTION:Title : "IceCube Observatory and Galactic Cosmic Ray Anisotroph y"\nSpeaker Name: Dr. Rasha Abbasi\nSpeaker Institution : University of Wis consin\n LAST-MODIFIED:20230127T203448Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100428T163000Z DTEND:20100428T173000Z DTSTAMP:20260828T094430Z UID:107uqg9i2j85muekl9hnbmq9ao@google.com CREATED:20100304T133945Z DESCRIPTION:SPEAKER: Yuan Mei\n\nAFFILIATION: Rice University\, Houston T X\n\nTITLE: Direct Dark Matter Search with XENON100 Experiment\n\nABSTRACT : Dark matter constitutes most of the mass in our universe. Although its existence is consistently confirmed by observations through gravitational e ffects\, the nature of dark matter remains unknown and the direct evidence of dark matter has yet to come. Weakly Interacting Massive Particles (WIMP s)\, a thermal relic of the Big Bang\, are a generic and arguably the most important class of dark matter candidates. WIMPs can be detected in princi ple by their interactions with ordinary matter.\n\nThe XENON dark matter ex periment pursues the goal of directly detecting nuclear recoils resulting f rom WIMP scattering off Xe nucleus. The detector concept consists of a dua l-phase liquid/gas xenon time projection chamber with a low energy threshol d and powerful\nbackground suppression. Following its successful predecess or XENON10\,\nour current experiment XENON100 reaches for a sensitivity 20 times better than current limits\, featuring 10 times greater sensitive mas s and 100 times lower background. I will discuss the latest development\na nd preliminary dark matter search results of the XENON100 detector.\n LAST-MODIFIED:20230127T203102Z LOCATION:Physics 2202 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121105T160000 DTEND;TZID=America/New_York:20121105T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121105T160000 CREATED:20120904T140915Z DESCRIPTION:Speaker: Sergei Noskov\n University of Calgary \n \nTopic: Channels and Nano-Pores: Explicit Modeli ng of Conductance. LAST-MODIFIED:20230127T203255Z LOCATION:Room 1103\, Bioscience Research Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221109T160000Z DTEND:20221109T170000Z DTSTAMP:20260828T094430Z UID:4kqm1tkug60k539kg3298060gp@google.com CREATED:20220929T143727Z DESCRIPTION:Literature Seminar: Hector Cein Mandujano

    Tit le: \;    Kitaev Quantum Spin Liquids\, From Concept to Realiza tion

    Abstract: \;https://chem.umd.edu/events/k itaev-quantum-spin-liquids-concept-realization LAST-MODIFIED:20221101T142045Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111026T150000Z DTEND:20111026T160000Z DTSTAMP:20260828T094430Z UID:jg751h75n9e6fhgjvvd4fs3ka0@google.com CREATED:20111011T125448Z DESCRIPTION:Title: Closure on two long-standing 2D electron physics problem s\nSpeaker: Daniel Tsui\, Princeton University LAST-MODIFIED:20230127T203021Z LOCATION:Phys 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100309T160000 DTEND;TZID=America/New_York:20100309T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100309T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Micheal Brenner\, Harvard University\nTitle: "Ad ventures in Self Assembly"\nAbstract: Self assembly promises a completely d ifferent paradigm for\nmanufacturing small devices: instead of piece-by-pie ce manufacturing\,\nstructures will spontaneously assemble into functional structures.\nEnabling this technology requires understanding how to choose the\nparts list and assembly protocol be chosen for robust self assembly.\n Although examples in biology demonstrate that such algorithms exist\,\nthe fundamental principles that govern design choices have not been\ndiscovered . What can be assembled and what cannot be assembled? How\ndoes the complex ity of the algorithm for assembling structures depend\non the complexity of the object? In this talk I will outline our\nresearch program aimed at add ressing these questions. The first part\nof the talk will focus on the ther modynamics of finite clusters of\nsmall spheres that bind to each other on sticking (joint work with\nVinny Manoharan's lab). We map out the free ener gy landscape of such\nclusters for identical spheres\, and discuss how coat ing the spheres\nwith specific stickers can bias the assembly towards compl ex\nstructures. The second part of the talk focuses on using microfluidics\ nto enable kinetically driven self assembly. LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T160000Z DTEND:20221208T170000Z DTSTAMP:20260828T094430Z UID:7rh232q0dmmk4pc0uhu5c1krr4@google.com CREATED:20221128T214102Z DESCRIPTION:Speaker: \;Dr. Katiuscia N. Cassemiro\, Managing editor of PRX Quantum

    Title: \;Tips for making peer review easy\, fruitful\, and successfully sharing your research
    < br>Abstract: \;Publishing an article requires not only scientific expertise but also engagement with the broader community\, which is aided in many ways by editors. I'll share my perspective on peer review and provi de some tips for successfully writing and publishing your next article. I w ill also show some data about the research from the University of Maryland that is published in the Physical Review journals. \; \;Finally\, I hope to convince you that PRX Quantum is an excellent venue f or publishing your results of interest to quantum science. \;

    Bio: Katiuscia works on publishing re search articles and helping to disseminate the knowledge to a broader audie nce. She has vast experience in cutting-edge research and technology\, havi ng implemented several photonic platforms enabling new studies of quantum p roperties of light. She received her Ph.D. in 2008 from the University of S ão Paulo (Brazil). Subsequently\, she worked as a postdoc at the Max-Planck institute (Germany)\, supported by a Humboldt fellowship. In 2011\, Katius cia returned to Brazil and joined the Federal University of Pernambuco\, wh ere she obtained her tenure and got awarded the “For Women in Science" priz e (L’Oréal-UNESCO—Brazilian component). Katiuscia joined the Physical Revie w as an editor in 2015. Since then\, she engages with the top experts in th e field to deliver a high-quality peer review.

    Host: Professo r Avik Dutt from IPST and Mechanical Engineering.     LAST-MODIFIED:20221128T214421Z LOCATION:IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Dr. Katiuscia N. Cassemiro TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110407T113000 DTEND;TZID=America/New_York:20110407T123000 DTSTAMP:20260828T094430Z UID:tccpsv8eudbavhddlpmpkul6rk@google.com RECURRENCE-ID;TZID=America/New_York:20110407T113000 CREATED:20110317T150721Z DESCRIPTION:Topic: "Dark matter annihilation via spherical harmonics of Fer mi gamma-rays"\nPresenter: Dmitry Malyshev (NYU)\nAbstract: Gamma-ray produ ction by dark matter annihilation is one of the most universal indirect dar k matter signals. In order to avoid intensive astrophysical background\, on e can study the gamma-rays away from the Galactic plane. The problem is tha t the dark matter annihilation signal at high latitudes is smooth and most probably subdominant to Galactic and extragalactic fluxes. I will discuss t he use of spherical harmonics decomposition as a tool to distinguish a larg e scale small amplitude dark matter signal from astrophysical fluxes. The s ensitivity of this method for currently available Fermi data is similar to the signal from thermal WIMP dark matter annihilation into\, e.g.\, W+W-. LAST-MODIFIED:20230127T203703Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131022T200000Z DTEND:20131022T210000Z DTSTAMP:20260828T094430Z UID:rc4h0nh1c1fkbodeeja0illdcs@google.com CREATED:20130423T160015Z DESCRIPTION:Speakers: E. Williams Shih-I Pai\, BP\nTitle: Energy and our other Natural Resources: \nMinerals\, Land\, Water and the Atmosphere\nAbs tract: Energy is essential to human civilization\, and
the production of en ergy and electrical power intersects other natural resources\, specifically minerals\, water\, land and earth’s atmosphere. Of these resources\, the strongest energy linkage is with the atmosphere. However\, the growing qua lity of life for more and more of the world’s population places additional stresses on minerals\, land and water\, as well as increasing the demand fo r energy. \n\nIn this talk\, we will address the question of whether the g rowing demand for energy can be sustained in the face of competing pressure s on our other natural resources. The trends in GHG emissions\, and the te chnical drivers for resource use\, especially water\, in energy production will be reviewed. We will show how technical choices available now could p revent some energy-resource collisions\, and discuss areas of continuing co ncern. \n\nOverall\, there are potential good news stories about resource use for energy\, but these will depend on human decisions and priorities to become a worldwide reality. \n\n LAST-MODIFIED:20230127T203758Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium-Shih-I Pai Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110328T190000Z DTEND:20110328T200000Z DTSTAMP:20260828T094430Z UID:n2ncc86t000rpubjqhpu7l6k0c@google.com CREATED:20110211T145337Z DESCRIPTION:Title: Topological order and quantum entanglement\nSpeaker: Mic hael Levin\nInstitution: University of Maryland\nAbstract: Topological quan tum field theories (TQFTs) were first discovered in the 1980s\nin the conte xt of string theory. Surprisingly\, TQFTs also describe the low energy phys ics of certain quantum condensed matter systems. These systems are said to contain "topological order." But what exactly is topological order? In my t alk\, I will show that topological order is fundamentally a kind of nonloca l quantum entanglement in the ground state wave function. I will introduce a quantity - called "topological entropy" - that measures precisely this no nlocal entanglement. LAST-MODIFIED:20230127T203707Z LOCATION:1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090406T200000Z DTEND:20090406T210000Z DTSTAMP:20260828T094430Z UID:ge72n7v5e1alv9a05320jrr53s@google.com CREATED:20090327T165422Z DESCRIPTION:Title: Adventures with Soft Matter: From Photorheological Fluid s to Blood-Gelling Biopolymers\nSpeaker: Professor Srinivasa R. Raghavan\, Department of Chemical & Biomolecular Engineering\, University of Maryland\ nMore Information: Refreshments at 3:45 pm\, For further information contac t: Dr. Thirumalai\, Coordinator LAST-MODIFIED:20230127T203628Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100426T163000Z DTEND:20100426T173000Z DTSTAMP:20260828T094430Z UID:1833csvdig9atam29ctqeqlaks@google.com CREATED:20100119T163732Z DESCRIPTION:Title : Having your cake and seeing it too - In-Site Observatio n of Incompressible Mott Insulating Domains in Optical Lattices\nSpeaker Na me: Cheng Chin\nSpeaker Institution : Chicago\nAbstract : Bose-Hubbard mode l describes one of the simplest realizations of a quantum phase transition\ , a phase transition that occurs even at zero temperature. Near the phase b oundary (critical point)\, quantum criticality\, resembling that of Ising-t ype magnetics in higher dimensions\, is expected to emerge with a full univ ersal behavior. In particular\, fluctuations and correlations are expected at all length scales. \nOur observation of atomic density profiles in optic al lattices provides a powerful tool to determine all relevant thermo-dynam ical quantities\, as well as density fluctuations and density-density corre lations [1\, 2]. I will describe our efforts to identify the superfluid-Mot t insulator phase boundary\, to extract quantum fluctuations and correlatio ns\, and also discuss the prospects to identify and characterize quantum cr iticality and universality based on trapped quantum gases in an optical lat tice. LAST-MODIFIED:20230127T203653Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080922T180000Z DTEND:20080922T190000Z DTSTAMP:20260828T094430Z UID:rffauptrboao2qibs9ki12h2ds@google.com CREATED:20080912T163846Z DESCRIPTION:Speaker:Kenji Kadota\, University of Minnesota\nSpeaker URL:htt p://www.physics.umn.edu/people/kadota.html\nInstitution URL:http://www.umn. edu/\nTitle:"Sterile neutrino dark matter in warped extra dimensions"\n LAST-MODIFIED:20230127T203653Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221213T190000Z DTEND:20221213T200000Z DTSTAMP:20260828T094430Z UID:7k5u4hvpavk7ts8kgc36epla1a@google.com CREATED:20221130T145433Z DESCRIPTION:Speaker: Dr. Norah Hoffmann\, Columbia University

    Title:  \;Light-Mat ter Interactions: From Classical to Quantum

     LAST-MODIFIED:20221130T145433Z LOCATION:Chemistry Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221117T190000Z DTEND:20221117T203000Z DTSTAMP:20260828T094430Z UID:04jb1pfs23rccfsiian71ibe2c@google.com CREATED:20220902T182322Z DESCRIPTION:Speaker: Hyunwoo Oh\, UMD

    Title: Infinite Var iance Problem in Lattice Fermions

    Abstract:  \;Monte Carlo calcu lations of fermionic systems with continuous auxiliary fields frequently su ffer from a diverging variance for fermionic observables. If the simulation s have an infinite variance problem\, one cannot estimate observables relia bly even with an arbitrarily large number of samples. In this talk\, we exp lore a method to solve this problem using sampling based on the distributio n of a system with an extra time-slice. The necessary reweighting factor is computed both perturbatively and through a secondary Monte Carlo. We show that the Monte Carlo reweighting coupled to the use of an unbiased estimato r of the reweighting factor leads to a method that eliminates the infinite variance problem at a very small extra cost. We compute the double occupanc y in the Hubbard model at half-filling to demonstrate the method and compar e the results to well established results obtained by other methods.
    LAST-MODIFIED:20221111T170825Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130918T193000Z DTEND:20130918T203000Z DTSTAMP:20260828T094430Z UID:nl0fr8veo5mqb4unv36g032nvs@google.com CREATED:20130913T142156Z DESCRIPTION:Speaker: Virginia Wheeler\, Naval Research Laboratory\n\nTitle : Recent Advancements in ALD Dielectric Integration with Graphene\n\nAbstr act:\n\nGraphene has attracted considerable attention as a material with ex cellent potential for low power\, high frequency applications. Yet\, to rea lize graphene-based transistors\, integration with a scalable high-κ dielec tric is required. Atomic layer deposition (ALD) is a viable approach to at tain electronic quality\, ultrathin dielectric films\; however\, the inert and hydrophobic nature of graphene inhibits direct application of ALD diele ctrics. Several methods have been investigated which render the graphene su rface more amenable to precursor bonding [1] and while each method has had some success in obtaining uniform ALD films\, it is often at the expense of deleterious structural damage\, mobility degradation and/or shifts in the Dirac voltage due to trapped charges within the gate stack. Alternatively\, we have recently developed a novel dry chemical functionalization approach using XeF2 that results in thin\, conformal\, high-κ ALD oxide films\, suc h as HfO2 (εHfO2=18.5) and Al2O3 (εAl2O3=8.9)\, on graphene\, without degra ding transport properties. By using this technique\, a 10-25% improvement i n graphene mobility and comparably small Dirac voltage shifts (HfO2=2V\, Al 2O3=0.1V) were observed\, indicating the effectiveness of fluorine function alization [2]. We have also recently explored using an NRL-patented large a rea plasma processing technique to add a variety of functionalities to the graphene surface including N\, O\, F\, and NH2. This unique plasma tool ha s an extremely low electron temperature (~1eV) which is less than the bond energy between C atoms\; thus\, enabling functionalization with minimal dam age to the graphene lattice. Here\, we will present in-depth details of ou r fluorination\, large area plasma functionalization and ALD dielectric pro cess\, discuss the advantages and limitations with respect to other methods used to enhance graphene reactivity for ALD\, and provide future direction s for this field of study. LAST-MODIFIED:20230127T203336Z LOCATION:LPS Downstairs Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120426T123000 DTEND;TZID=America/New_York:20120426T133000 DTSTAMP:20260828T094430Z UID:1m1cq74edn1mdslvom5ns0qc1c@google.com RECURRENCE-ID;TZID=America/New_York:20120426T123000 CREATED:20120420T194549Z DESCRIPTION:Speaker: TBA\nTitle: TBA LAST-MODIFIED:20230127T203552Z LOCATION:1207 Energy Research Facility SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121112T220000Z DTEND:20121112T230000Z DTSTAMP:20260828T094430Z UID:nrlbfbp5k2u5mtd51bt4qkecj0@google.com CREATED:20121022T130156Z DESCRIPTION:Speaker:Dr. Lester R. Brown\nTitle: Full Planet\, Empty Plates: The New Geopolitics of Food Scarcity\nAbstract: With food scarcity driven by falling water tables\, eroding soils\, and rising temperatures\, control of arable land and water resources is moving to center stage in the global struggle for food security. In this era of tightening world food supplies\ , the ability to grow food is fast becoming a new form of geopolitical leve rage. Food is the new oil. What will the geopolitics of food look like in a new era dominated by scarcity and food nationalism? Brown outlines the pol itical implications of land acquisitions by grain-importing countries in Af rica and elsewhere as well as the world’s shrinking buffers against poor ha rvests\, and exposes the increasingly volatile food situation the world is facing.\n\nBio: Described as “one of the world’s most influential thinkers” by the Washington Post\, Lester Brown is Founder and President of Earth Po licy Institute\, a non-profit environmental research organization based in Washington\, D.C. During a career that started with tomato farming\, Brown has been awarded 25 honorary degrees and has authored or coauthored over 50 books. One of the world's most widely published authors\, his books have a ppeared in some 40 languages. One of his recent books\, World on the Edge\, was called by the Financial Times "a provocative primer on some of the key global issues that businesses will face in the coming decades.” He is a Ma cArthur Fellow and the recipient of many prizes and awards including United Nations' Environment Prize\, the World Wide Fund for Nature Gold Medal\, a nd the Blue Planet Prize for his "exceptional contributions to solving glob al environmental problems." In 1985 the Library of Congress requested his p ersonal papers noting that his writings and work had “already strongly affe cted thinking about problems of world population and resources.” Brown ear ned master degrees in agricultural economics from the University of Marylan d and in public administration from Harvard University. He was inducted in to the University of Maryland Alumni Hall of Fame in 2010.\n\nWhen:November 12\, 2012\nWhere:Computer Science Instructional Center\, University of Mar yland\, College Park\n4:00PMReception in Atrium\n5:00PMLecture in Room 1115 \n\nWelcome: Antonio Busalacchi\, Chair of the Coun cil on Environment\nIntroductory Remarks: Senator Joseph D. Tydings\n Herman E. Daly\, University of Maryl and\, School of Public Policy \n \ nTHIS LECTURE IS OPEN TO THE PUBLIC\nClick below for directions. Parking i s free after 4pm. For more information on the Council on the Environment s ee: http://cone.umd.edu/ \n LAST-MODIFIED:20230127T203335Z LOCATION:CSIC Lecture Room 115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:University of Maryland Council on the Environment Distinguished Lec ture Series\, Inaugural Event TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221118T183000Z DTEND:20221118T200000Z DTSTAMP:20260828T094430Z UID:4ch8kslov9804plqrdsjnp5rtk@google.com CREATED:20221111T164709Z DESCRIPTION:Speaker: Chien-Peng Yuan\, Michigan State University\n\nTitle:\ nResBos2 and the CDF W mass measurement"\n\n\nAbstract:\nThe recent CDF W m ass measurement of 80\,433 $\\pm$ 9 MeV is the most precise direct measurem ent. However\, this result deviates from the Standard Model predicted mass of 80\,359.1 $\\pm$ 5.2 MeV by $7\\sigma$. The CDF experiment used an older version of the ResBos code that was only accurate at NNLL+NLO\, while the ResBos2 code is able to make predictions at N${}^3$LL+NNLO accuracy. We det ermine that the data-driven techniques used by CDF capture most of the high er order corrections\, and using higher order corrections would result in a decrease in the value reported by CDF by at most 10 MeV. LAST-MODIFIED:20221111T170612Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Joint Particle Theory/ Experiment Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100420T160000 DTEND;TZID=America/New_York:20100420T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100420T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Dr. Francis Slakey\, American Physical Society\nTitle: "Federal Science Policy: A View From the Trenches" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090427T163000Z DTEND:20090427T173000Z DTSTAMP:20260828T094430Z UID:0r4eq1209ubf6i8k6tnpblvcu8@google.com CREATED:20090427T134956Z DESCRIPTION:SPEAKER: Pierre Meystre (University of Arizona)\n\nTITLE: Cavit y Optomechanics LAST-MODIFIED:20230127T203531Z LOCATION:Phys 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121114T193000Z DTEND:20121114T203000Z DTSTAMP:20260828T094430Z UID:cie536h5q1oln79ec048kiscq8@google.com CREATED:20120905T170745Z DESCRIPTION:SPEAKER: Taku Izubuchi - Brookhaven National Laboratory\nTITLE: "Applications of Lattice QCD+QED"\nABSTRACT: We review for the recent stud ies of lattice QCD including for the electromagnetism\, lattice QCD+QED. Th e applications include\, the chiral perturbation theory with virtual photon \, photon's vacuum polarization effects from light (up\,down\, and strange) quarks\, isospin breaking effects in hadrons\, and hadronic contribution t o muon's anomalous magnetic moment\, g-2. A brief discussion on statistical error reduction technique is also presented.\n LAST-MODIFIED:20230127T203334Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081119T203000Z DTEND:20081119T213000Z DTSTAMP:20260828T094430Z UID:fmhpmhgrlvtqsb175nmk9tbh7c@google.com CREATED:20081110T163618Z DESCRIPTION:Title: Linearized Electrooptic Phase Modulation for Microwave-P hotonic Signal Transmission\nSpeaker: Professor Tom Murphy\, University of Maryland\, Department of Electrical and Computer Engineering LAST-MODIFIED:20230127T203401Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220919T203000Z DTEND:20220919T213000Z DTSTAMP:20260828T094430Z UID:4jf4lrrku896r75tmnt9o20766@google.com CREATED:20220902T160912Z DESCRIPTION:Title: \;Phenomenology and theory of galactic co smic-ray propagation

    Speaker: Carmelo Evoli\, Gran Sasso Science Ins titute\, Italy

    Abstract: Cosmic rays are the most energetic particle s in the local Universe as they are known to reach energies above a few Jou les. How and where they are produced has been a science puzzle for several decades\, whose solution has given rise to the era of multi-messenger astro physics. Of particular interest is the energy range below ~PeV as we expect that these particles have been all accelerated in the most extreme objects in our own Galaxy. Additionally\, the past decade has seen an unprecedente d improvement in the quality and quantity of data about their energy spectr um and chemical composition\, allowing us to infer global properties as the galactic grammage and the average residence time. These quantities are cru cial to test any more fundamental description of the transport of charged p articles in the interstellar plasmas. Even more thrilling\, these new measu rements\, together with a deeper scrutiny of the diffuse gamma-ray emission from the Galactic plane\, have revealed unexpected new features that are c hallenging the commonly accepted scenario of how these particles are energi zed and propagate through interstellar space. In my talk\, I will provide a n overview of these recent findings\, and discuss some of the new ideas prop osed to explain these anomalies.
    Recording of the talk

    Notes: Join the meeting at 4:15 for meet and greet
    Visit https://bit.ly/2PmJoT6< /a> for access.     LAST-MODIFIED:20221024T230259Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T170000Z DTEND:20220301T190000Z DTSTAMP:20260828T094430Z UID:4r6v603ftpib84hrbm3ksubo48@google.com CREATED:20220121T185334Z DESCRIPTION:An industry is emerging to develop practical applica tions of the quantum computing\, communication and networking concepts that have emerged during the past 25 years. \; We will hear of opportunitie s and challenges in this field from two industry leaders:

    • Za chary Dutton\, Business Lead\, Physical Sciences and Systems\, Raytheon BBN Technologies\, Cambridge\, MA. Zac has a distinguished record of research in quantum physics\, some of which was performed when he was a NIST Nationa l Research Council Postdoctoral Research Associate\, 2002-2004
    • Alir eza Shabani \;is a scientist and an entrepreneur\, currently the head o f Quantum Research at Cisco. Prior to joining Cisco\, he built Qulab\, a ph arma startup levering AI and quantum chemistry to automate drug design. He was also a senior scientist at Google Quantum AI Lab. His research has been at the intersection of quantum physics\, engineering\, and biology.”
      • < /ul>Attendance at Joint Quantum Institute Career Seminars is restricted to junior affiliates (students\, postdoctoral associates and staff) of the Uni versity of Maryland or the National Institute of Standards and Technology.< br>
      Host: Charles Clark LAST-MODIFIED:20230127T203313Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Career Seminar: The Emerging Quantum Industry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100831T200000Z DTEND:20100831T210000Z DTSTAMP:20260828T094430Z UID:jc7nm33bts7s1t0e3u3o3mgqs4@google.com CREATED:20100825T173348Z DESCRIPTION:Speaker: Jim Beichler\, West Virginia University\nTitle: Twist and Shout! W.K. Clifford's attempts to Solve the Universe\nAbstract: Willia m Kingdon Clifford is famous for statements that he made in 1870 to the eff ect that matter is nothing but ripples\, hills and bumps of space curved in a higher dimension and the motion of matter is nothing more than variation s in that curvature. For having said this Clifford has been both hailed and condemned for having anticipated Einstein’s general theory of relativity. The standard view of historians\, scholars and scientists is that his ideas were not tenable at the time\, he never developed or wrote down his theory (if he ever had one)\, and he had no followers or students to carry on his work. Nothing is further from the truth on all three counts. Modern schola rs have failed to recognize Clifford’s theory because they have only been l ooking for Einstein’s gravity theory in the 1870s\, which is based on tenso rs\, while tensor calculus was not developed until decades after Clifford’s untimely and unfortunate early death from consumption in 1879. So they are wrong on both counts. Those scholars who have even bothered to look at the original literature on the subject have been unable to find Clifford’s pub lished but incomplete theory because he was forced to develop his own mathe matical system of biquaternions to model motion as it would appear in the h igher-dimensional space. Nor was Clifford seeking a new theory of gravity\, but rather a more coherent and intuitive portrayal of his friend Maxwell’s new electromagnetic theory. However\, Clifford believed that dynamical for ces in three-dimensional space reduced to kinematical motions in four-dimen sional space and therefore planned to include a new theory of gravity after he polished off electromagnetism. In other words\, Clifford was trying to develop a unified field theory that would more consistently look like moder n day unifications rather than just an earlier version of general relativit y. LAST-MODIFIED:20230127T203115Z LOCATION:Phys 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110216T150000 DTEND;TZID=America/New_York:20110216T160000 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110216T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "The handwaver's guide to dark matter halos"\n[Speaker] Neal Dalal\n[Institution] CITA\, University of Toronto\n[Abstract] Dark ma tter halos are the endpoints of cosmological structure formation. They pla y a crucial role in many areas of astrophysics and cosmology\, and are host to most of the `interesting' objects that we see around us\, like galaxies and quasars. Our understanding of halos is based almost entirely on numer ical experiments in N-body simulations\, with relatively poor theoretical u nderstanding of what determines halo properties. In my talk\, I will try t o give a simple way to understand many properties of halos\, including thei r internal structure and their abundance. I will show how this approach op ens new avenues for exploring our cosmology\, with a focus on physics beyon d the standard (cosmological) model.\n\n LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building (may change the room) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101005T200000Z DTEND:20101005T210000Z DTSTAMP:20260828T094430Z UID:qhofd189lpk8rqu6nfargdd90o@google.com CREATED:20100825T174451Z DESCRIPTION:Speaker: Brian Clark\, Schlumberger Technology Corporation\nTit le: Physics and the search for hydrocarbons LAST-MODIFIED:20230127T203603Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111031T160000Z DTEND:20111031T163000Z DTSTAMP:20260828T094430Z UID:pr1mbunn59oldm5qmna062r408@google.com CREATED:20111020T143418Z LAST-MODIFIED:20230127T203257Z LOCATION:Physics 1305F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI LUNCHEON TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101108T173000Z DTEND:20101108T183000Z DTSTAMP:20260828T094430Z UID:p92gl3ilci97o2kpkt87frr638@google.com CREATED:20100825T185625Z DESCRIPTION:Title: Levitated Spinning Graphene\nSpeaker: Bruce Kane\, Unive rsity of Maryland\, Laboratory of Physical Sciences\nAbstract: I will descr ibe a method for levitating micron-sized few layer graphene flakes in a qua drupole ion trap. Starting from a liquid suspension containing graphene\, c harged flakes are injected into the trap using the electrospray ionization technique and are probed optically. At micro-torr pressures\, torques from circularly polarized light cause the levitated particles to rotate at frequ encies exceeding 1 MHz\, which can be inferred from modulation of light sca ttering off the rotating flake when an electric field resonant with the rot ation rate is applied. I will present possible applications of these techni ques\, both to fundamental measurements of the mechanical and electronic pr operties of graphene and to new approaches to graphene crystal growth\, mod ification and manipulation. LAST-MODIFIED:20230127T203558Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111128T170000Z DTEND:20111128T173000Z DTSTAMP:20260828T094430Z UID:872j6qkdr3d7mth64qoic8fkjk@google.com CREATED:20111024T132352Z LAST-MODIFIED:20230127T203601Z LOCATION:Physics 1305F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100218T190000Z DTEND:20100218T200000Z DTSTAMP:20260828T094430Z UID:247n6s46an42eudvrihin7h4ik@google.com CREATED:20100216T142341Z DESCRIPTION:[Speaker] James Hone\n[Institution] Columbia University\n[Title ] Nanomechanics of nano-carbon\n[Abstract] This talk will describe our work toward fundamental understanding of the mechanical and electromechanical p roperties of carbon nanotubes and graphene\, and their application in nano- electromechanical devices (NEMS). Using a combination of optical character ization and electromagnetic displacement\, we have measured the mechanical stiffness of individual nanotubes of known chiral index1\, and the strain-i nduced changes in electronic bandstructure2. We have used nanoindentation to measure the elastic stiffness and ultimate strength of single graphene s heets3. These measurements show that graphene is the strongest material ev er measured\, with an ultimate strength of 130 GPa at strain rates of over 25%. As such\, it is the first material whose mechanical properties can be probed deep into the nonlinear elastic regime. As an example\, we are abl e to probe the vibrational modes by Raman spectroscopy under large strain\, to observe shifts and splitting in the G\, 2D\, and 2D’ modes. We have al so measured the frictional behavior of graphene and related 2-dimensional m aterals\, which shows a strong dependence on the number of atomic layers in all cases. Finally\, we have demonstrated electronic readout of graphene nanomechanical resonators\, and tested their response to changes in mass an d temperature.\nTime permitting\, I will also provide a short summary of on going work on the properties of other 2-dimensional materials\, and their u se with graphene in hybrid devices.\n\n Yang Wu\, Mingyuan Huang\, Feng Wan g\, Henry X. M. Huang\, Sami Rosenblatt\, Limin Huang\, Hugen Yan\, Stephen P. O’Brien\, J. Hone\, and Tony F. Heinz\, “Determination of the Young’s M odulus of Structurally Defined Single-Walled Carbon Nanotubes\,” Nano Lette rs 8\, 4158 (2008)\n2 Mingyuan Huang\, Yang Wu\, Bhupesh Chandra\, Hugen Ya n\, Yuyao Shan\, Tony F. Heinz\, J. Hone\, “Direct Measurement of Strain-in duced Changes in the Band Structure of Carbon Nanotubes\,” Phys. Rev. Lett. 100\, 136803 (2008).\n3 Changgu Lee\, Xiaoding Wei\, Jeffrey Kysar\, J. Ho ne\, “Measured elastic properties and ultimate strength of monolayer graphe ne\,” Science 321\, 385 (2008)\n\n[Note] preceded by refreshment at 1:30pm in the Toll Room LAST-MODIFIED:20230127T203852Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100323T160000 DTEND;TZID=America/New_York:20100323T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100323T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Gary Gladding\, University of Illinois\, Urbana- Champaign\nTitle: "Reforming Introductory Physics Courses at Research Unive rsities" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110504T151500 DTEND;TZID=America/New_York:20110504T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110504T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Middleweight black holes: do they exist\, and what wou ld they mean?"\n[Speaker] Cole Miller\n[Institution] University of Marylan d\n[Abstract] Stellar mass (~few to tens of solar masses) and supermassive (millions to billions of solar masses) black holes are well established\, b ut there is still doubt about ones of intermediate mass (hundreds to thousa nds of solar masses). If \nintermediate-mass black holes do exist\, they h ave many implications as unique gravitational wave sources\, with ties to m any frontier topics in astrophysics including the first stars\, the dynamic s of dense stellar clusters\, and the formation and evolution of supermassi ve black holes. After giving a brief overview of the evidence that they ex ist and proposed scenarios for their birth and growth\, I will focus most o f my talk on the binaries they likely form and their potential\, as gravita tional radiation sources\, to provide remarkably precise tests of the predi ctions of general relativity in strong gravity. LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221007T160000Z DTEND:20221007T170000Z DTSTAMP:20260828T094430Z UID:4rp04pa7dqc82dgcip9dflth6j@google.com CREATED:20221003T004305Z DESCRIPTION:Title: Lieb-Robinson bounds and their application to disordere d systems\nSpeaker: Christopher Baldwin (QuICS)\nTime: Friday\, October 7 \, 2022 - 12:00pm\nLocation: ATL 2324\n\nThe non-equilibrium dynamics of q uantum many-body systems is a notoriously difficult topic of study\, but on e in which much progress is currently being made. Lieb-Robinson bounds have proven to be a valuable tool for obtaining both rigorous results and physi cal intuition. In this talk\, after an introduction to the physical content of Lieb-Robinson bounds and a description of various applications\, we dis cuss our recent work constructing bounds for systems with quenched disorder in 1D. We use the bounds to determine when weak links in a chain can modif y the dynamical exponent (and calculate the correct dynamical exponent in s uch cases)\, and further show that even the concept of the Lieb-Robinson &q uot\;light cone"\; must be revisited in the presence of disorder. We th en close by discussing the implications of our results in numerous contexts .\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221003T004305Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Christopher Baldwin TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120419T173000Z DTEND:20120419T180000Z DTSTAMP:20260828T094430Z UID:seukt5978ut5u0ikps8m831tdo@google.com CREATED:20120406T181928Z LAST-MODIFIED:20230127T203420Z LOCATION:Rm 1305F (the new) Toll Rm.\, Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110427T153000Z DTEND:20110427T170000Z DTSTAMP:20260828T094430Z UID:3gtb3iigipsqd30cjfg9837124@google.com CREATED:00010101T000000Z DESCRIPTION:No Seminar Arranged. LAST-MODIFIED:20230127T203224Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cancelled-Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101109T200000Z DTEND:20101109T210000Z DTSTAMP:20260828T094430Z UID:01vojb66s8r6ksm4tjs7q4310g@google.com CREATED:20101027T170840Z DESCRIPTION:itle: Energy harvesting Research at Imperial College London: fr om micro-scale to macro-scale\n\nPaul Mitcheson\nImperial College London\n\ nAbstract:\nImperial College London has a relatively large research program in the area of energy harvesting and micro power generation\, with around 6 full time researchers and 5 faculty members interested in the subject. W e started our work in 2001 investigating ways to power device on\, or in\, the human body using MEMS technology. Since then we have prototyped device s to harvest energy from larger rotating machines\, air flows and for wirel ess sensor networks in marine environments and we still have an activity in MEMS harvesters where we are now prototyping a tunable device. In this ta lk I will give an overview of this work\, including the challenges we have faced in implementing the prototypes giving details of the mechanical and e lectrical challenges.\n\nNote: For guests attending the LPS seminar\, pleas e use the phone on the left hand side of the front door to call the recepti onist for entry.\nIf you have any questions\, need directions\, would like to give a seminar\, or suggest a seminar speaker or topic\, please feel fre e to reply to this email and/or call us. Thanks very much for your support and interest in the LPS Seminar Series.\nDr. Charles Tahan (301-935-6411) c tahan@lps.umd.edu\nDr. Cliff Hull chull@lps.umd.edu LAST-MODIFIED:20230127T203623Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Special LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100513T160000 DTEND;TZID=America/New_York:20100513T173000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com RECURRENCE-ID;TZID=America/New_York:20100513T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Dan Prober\n[Institution] Yale Uinversity\n[Title] U ltrasensitive Superconducting Photon Detectors\n[Abstract] This talk will d escribe the physics\, development and uses of single photon detectors\, cov ering photon energies from MeV to meV\, and wavelengths from 1 picometer to 1 mm. The developments have been driven by many applications\, drawn from astronomy\, biology\, communications\, and materials analysis. This talk wi ll present a selection of these developments\, and recent device physics re search at Yale.\n[Speaker's Biography] Dr. Prober is a Professor of Applied Physics and Physics at Yale University. He joined the faculty in 1975 as a n Assistant Professor\, after completing the Ph.D in Physics at Harvard. \n He was promoted to tenure in 1981. His main research interests are in low t emperature electron transport in nanosystems\, superconductivity\, quantum noise and low temperature photon detectors. Dr. Prober is a Fellow of the A merican Physical Society and of the Connecticut Academy of Sciences\, and h as received two NASA research awards and two Fulbright Faculty Fellowships. He is the Director of Graduate Admissions for the Yale Faculty of Engineer ing. He has trained over 30 PhD students and over a dozen postdoctoral fell ows. His teaching ranges from a graduate course on superconductivity to a f reshman seminar on 'Science of Modern Technology'\, and lectures in New Hav en grade schools.\n[Host] Chris Lobb\n[Note] The time change. Start at 4pm. Refreshment is serviced at 3:30pm in the main lobby of Physics building. LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130307T173000Z DTEND:20130307T183000Z DTSTAMP:20260828T094430Z UID:toge223833akfo469utgsl02q0@google.com CREATED:20130215T174445Z DESCRIPTION:Title: The Turing bifurcation on networks: Collective patterns and single differentiated nodes\nSpeaker: Matthias Wolfrum\nWeierstrass Ins titute\, Berlin\n LAST-MODIFIED:20230127T203057Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081124T190000Z DTEND:20081124T200000Z DTSTAMP:20260828T094430Z UID:ulg2v2is29fvln3dalcc6lj3dc@google.com CREATED:20080915T191804Z DESCRIPTION:Speaker:Basudeb Dasgupta\, TIFR\, Mumbai/MPI\, Munich\nTitle:"T BA"\n LAST-MODIFIED:20230127T203243Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221108T180000Z DTEND:20221108T193000Z DTSTAMP:20260828T094430Z UID:1o7227a1jidng3k0okjhp8qjhr@google.com CREATED:20220920T114507Z DESCRIPTION:Speaker: Professor Kateria DuBay\, University of Vir ginia

      Title: TBA

      Abstract: \;      h ttps://chemistry.as.virginia.edu/people/profile/khd2t LAST-MODIFIED:20220920T115104Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221206T160000Z DTEND:20221206T170000Z DTSTAMP:20260828T094430Z UID:7ua9a9ilaunip20qprt01p0e5v@google.com CREATED:20220815T165447Z DESCRIPTION:Literature Seminar: Hallie Pennington\, UMCP

      Title: \;      Role of an EF-hand Protein (EfhP) in Pseudomonas a eruginosa Infections of Cystic Fibrosis Patients LAST-MODIFIED:20221130T145015Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090210T181500Z DTEND:20090210T191500Z DTSTAMP:20260828T094430Z UID:6fbnd3mumgrb58i2n44vjteops@google.com CREATED:20090202T160228Z DESCRIPTION:Title: Static and Dynamic Correlations in Water at Hydrophobic Interfaces\nSpeaker: Dr. Jeetain Mittal\, Laboratory of Chemical Physics\, NIH\nMore Info: As in the past\, each seminar will be preceded by an INFORM AL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 abou t five minutes after 12:00 (Noon).\n\nContact:\nProfessor Christopher Jarzy nski\, cjarzyns@umd.edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd.edu \, (301)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)405-161 0 LAST-MODIFIED:20230127T203522Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131203T160000Z DTEND:20131203T173000Z DTSTAMP:20260828T094430Z UID:n16qsplttin4s5c2esppv86pp8@google.com CREATED:20131120T152416Z DESCRIPTION:Speaker: Emil Yuzbashyan (Rutgers)\n\nTitle: What's quantum i ntegrability and who cares?\n\nAbstract: A sound notion of integrability f or quantum systems has remained elusive for decades. As a result\, conditi ons for e.g. the absence of thermalization\, Poisson level statistics\, and level crossings in integrable Hamiltonians are similarly vague. This is pa rticularly relevant nowadays when dynamical and equilibrium properties of m any integrable systems became experimentally accessible.\n\nIn this talk\, I will propose a surprisingly simple and yet unambiguous notion of quantum integrability leading to specific results\, such as new general classes of integrable models\, exact solution\, and precise criteria for Poisson stati stics and level crossings. I will also explain in simple terms and prove th e absence of thermalization in classical integrable models.\n\nHost: Ed Ba rnes\n\nhttp://www.physics.umd.edu/cmtc/seminars.html LAST-MODIFIED:20230127T203850Z LOCATION:2205 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100504T160000 DTEND;TZID=America/New_York:20100504T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100504T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Abhay Ashketar\, Institute for Gravitation and t he Cosmos\, Penn State\nTitle: "Quantum Nature of the Big Bang in Simple Mo dels" LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110224T163000Z DTEND:20110224T173000Z DTSTAMP:20260828T094430Z UID:p3uul8etl14836sipsfoqcq8pc@google.com CREATED:20110215T160009Z DESCRIPTION:[Topic] Evidence for eternal inflation bubble collisions in the CMB?\n[Paper Reference] arXiv:1012.1995v2\, arXiv:1012.3667v1 [astro-ph.CO ]\n[Presenter] Kev Abazajian\, University of Maryland LAST-MODIFIED:20230127T203802Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110408T170000Z DTEND:20110408T180000Z DTSTAMP:20260828T094430Z UID:kifhs1j4gsur89kr98nqugi7do@google.com CREATED:20110404T142952Z DESCRIPTION:Title : Focused Ion Beam Assembly\, Functionalization and Chara cterization of Semiconductor Nanostructures\nSpeaker Name: Robert Hull\, He nry Burlage Jr. Professor of Engineering and Department Head\nSpeaker Insti tution : Materials Science and Engineering\, Rensselaer Polytechnic Institu te\nNotes: This is a Materials Science seminar.\nAbstract : I will describe how the focused ion beam (FIB) can be used for controlled fabrication and doping of novel semiconductor nanostructures\, with application to potentia l nanoelectronic architectures. Specific examples include nanoscale templat ing of epitaxial Ge quantum dots and quantum dot molecules on Si(100) surfa ces\, and fabrication of metal and insulator core-shell structures on semic onductor nanowires. We are also developing methods for electronic and magne tic functionalization of these nanostructures using a mass-selected FIB\, w here ions of different species can be separated from liquid metal alloy sou rces (e.g. Si from AuSi\, B and As from PdAsB\, and Mn and Ge from MnGe).\n \nWork in collaboration with D. Bearud\, L. He\, J. Murphy (RPI)\; J. Floro \, J. Graham (U. Virginia)\, J. Gray (U. Pittsburgh)\, F. Ross (IBM)\, M. G herasimova (U. South CT) A. Portavoce (CNRS-Marseilles)\, J. Jonasson\, L. Samuelson (U. Lund). LAST-MODIFIED:20230127T203808Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091204T160000Z DTEND:20091204T170000Z DTSTAMP:20260828T094430Z UID:s54eau5hbkc5g6qs427vu6kli4@google.com CREATED:20091130T144427Z DESCRIPTION:Title: Understanding Biological Mechanisms Using High Resolutio n Force Spectroscopy\n\nPresented by Joonil Seog\nAssistant Professor\, Fis chell Department of Bioengineering and Department of Materials Science and Engineering\nUniversity of Maryland\n\nAbstract: Atomic Force Microscopy (A FM) and optical tweezers (OT) have capability of measuring molecular level interactions with high spatial resolution. Molecular origin of biomechanica l properties of cartilage probed by direct force measurement using AFM will be briefly reviewed. In another example of a biological system\, mechanica l unfolding and refolding behaviors of an adhesion molecule\, integrin\, we re investigated at the single molecule level using OT. The integrin is a he terodimer transmembrane protein that plays a critical role in cellular adhe sion and migration during the inflammation and immune response. When the I domain of integrin is mechanically stretched\, the two step unfolding behav ior with different extension distances occurred in a specific order indicat ing that there are two sub-domains in the I domain with different mechanica l properties. In force-clamping experiments\, a quasi-stable intermediate s tate was observed\, which suggests that such intermediate is on-pathway to the folded state. The identity of the intermediate state and the force-bear ing region of the I domain are discussed based upon structural analysis of integrin I domain. Lastly\, the applications of single molecule techniques in the area of peptide self-assembly\, gene delivery\, and neurodegenerativ e disease will be presented with preliminary data. LAST-MODIFIED:20230127T203613Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bioengineering Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081022T200000Z DTEND:20081022T213000Z DTSTAMP:20260828T094430Z UID:ekppsqnr79g4m1m1urucd67gbs@google.com CREATED:20080912T182712Z DESCRIPTION:Speaker:Urs Heller\, American Physical Society and Brookhaven N ational Lab\, NY\nTitle:"Some Results from Full 2+1 Flavor Simulations of Q CD"\nWeb site:http://www.physics.umd.edu/tqhn/AbstractUH\nMore Information: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=find+a+heller%2C+ur s&FORMAT=WWW&SEQUENCE=\nContact Loretta Robinette ((301) 405-6115)\n(See ht tp://www.physics.umd.edu/tqhn)\n\n LAST-MODIFIED:20230127T202952Z LOCATION:Physics Building\, Room: 2101 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN/ENP SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221101T171500Z DTEND:20221101T181500Z DTSTAMP:20260828T094430Z UID:1559htak7o6viqi6iff6c80j29@google.com CREATED:20220815T135127Z DESCRIPTION:Speaker: Professor Abraham Nitzan\, Universit y of Pennsylvania

      Title: \;Collective Response in Light-Matter I nteractions: The Interplay Between Strong Coupling\, Local Dynamics\, and D isorder

      Abstract: \;https://www.chem.upenn.edu/profile/a braham-nitzan       LAST-MODIFIED:20221025T182241Z LOCATION:IPST 1116 Conf. Rm. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130227T190000Z DTEND:20130227T200000Z DTSTAMP:20260828T094430Z UID:hl7pb82u8keitfe5s0e6ksef0g@google.com CREATED:20130208T210259Z DESCRIPTION:Title: "A Convergence on an Understanding of the Dense Matter E quation of State"\nSpeaker: James Lattimer\nInstitution: State University o f New York at Stony Brook\nAbstract: Determining the equation of state of n eutron star matter has been a long-sought goal. Recently\, there has been a remarkable convergence in our understanding of dense matter from several directions: multiple nuclear experiments\, theoretical neutron matter studi es\, pulsar mass determinations\, and estimates of neutron star masses and radii from\nX-ray sources. The key parameters are related to the symmetry energy of matter near the nuclear saturation density\, which is closely rel ated to the neutron star mass-radius relation. Observations indicate that the maximum neutron star mass is in excess of 2 solar masses\, and\, togeth er with nuclear experimental and theoretical studies\, restrict the radii o f neutron stars with approximately 1.4 - 1.5 solar masses to lie in the ran ge 11 to 12.5 km. In addition\, the rapid cooling recently found for the n eutron star in the Cassiopeia\nsupernova remnant indicates that both neutro n superfluidity and proton superconductivity exist in its interior\, and ti ghtly constrain their respective critical temperatures. LAST-MODIFIED:20230127T203521Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230126T203000Z DTEND:20230126T213000Z DTSTAMP:20260828T094430Z UID:0mis0af75664t1o90qtr07nlmj@google.com CREATED:20230125T160039Z DESCRIPTION:This will be an organizational meeting for an interdisciplinary seminar joint between the physics and mathematics departments\, on aspects of physics with a significant input from modern geometry and topology.

      Contact: Jonathan Rosenberg\,   jmr@umd.edu LAST-MODIFIED:20230125T160059Z LOCATION:Toll Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Geometry/Physics RIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120416T200000Z DTEND:20120416T210000Z DTSTAMP:20260828T094430Z UID:2kgg8sa9p313bnd6qeqe5if1t0@google.com CREATED:20120409T191845Z DESCRIPTION:Speaker: Malcolm Beasley\, Stanford University\n\nTitle: A Rene wed Look at Superconductivity in the Bismuthate Class of Superconductors\n\ nAbstract: Among the relatively high Tc oxide superconductors are the bismu thates (e.g.\, doped BaBiO3 and BaPbO3). Neglected since the discovery of the cuprate and later the Fe-pnictide superconductors\, Under the AFOSR MUR I program in high temperature superconductivity\, we and our collaborators have taken a fresh look at the superconductivity in these so called negativ e U superconductors. The results provide new insights into the nature of t he superconductivity in these materials. Examples include\, the strong rol e of disorder\, two-dimensional behavior in the three-dimensional materials \, apparent interface superconductivity between metallic BaPbO3 and insulti ng BaBiO3\, and the recognition that they represent a new class of correlat ed materials. In this talk we will review these new results and what they seem to be telling us.\n\nHost: Rick Greene LAST-MODIFIED:20230127T203832Z LOCATION:Room 1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220919T150000 DTEND;TZID=America/New_York:20220919T163000 DTSTAMP:20260828T094430Z UID:15hs531cbbchm32r0e12abvc9k@google.com RECURRENCE-ID;TZID=America/New_York:20220919T150000 CREATED:20220815T134855Z DESCRIPTION:Speaker: Qianshu Lu\, Harvard

      title: Missing scalars at the cosmological collider

      abstract: Light scalar fields t ypically develop spatially varying backgrounds during inflation. Very often they do not directly affect the density perturbations\, but interact with other fields that do leave nontrivial signals in primordial perturbations. In this sense they become "missing scalars" at the cosmological collider. W e study potentially observable signals of these missing scalars\, focusing on a special example where a missing scalar distorts the usual oscillatory features in the squeezed bispectrum. The distortion is also a useful signal distinguishing the de Sitter background induced thermal mass from a consta nt intrinsic mass.
       LAST-MODIFIED:20220919T141107Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121001T160000 DTEND;TZID=America/New_York:20121001T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121001T160000 CREATED:20120904T140915Z DESCRIPTION:Title : New Insights into Amyloid Formation from Solid State NM R.\nSpeaker Name: Robert Tycko\nSpeaker Institution : NIDDK\, NIH\nNotes: R efreshments served at 3:45pm LAST-MODIFIED:20230127T203255Z LOCATION:BIOSCIENCE RESEARCH BLDG 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101201T193000Z DTEND:20101201T210000Z DTSTAMP:20260828T094430Z UID:7cp3k4ujbm1tg4c0270qt5umu0@google.com CREATED:20100914T165804Z DESCRIPTION:SPEAKER: Hans Pieter Mumm\nAFFILIATION: NIST\, Gaithersburg M D\nTITLE: Measuring the Neutron Lifetime using Magnetically Trapped Ultrac old Neutrons \nABSTRACT: The neutron beta-decay lifetime is import ant in both theoretical predictions of the primordial abundance of $^{4}$He and in providing a strong unitarity test of the CKM mixing matrix. We have \npreviously demonstrated trapping of Ultracold Neutrons (UCN) in a magneti c trap\, and\, though statistically limited\, measured a lifetime consisten t with the world average. A major upgrade of the apparatus has now been com pleted at NIST. In our unique approach\, a 0.89 nm neutron beam is incident on a superfluid \n$^{4}$He target within the minimum field region of an Io ffe-type magnetic trap. Neutrons are\ndownscattered by single phonon scatte ring in liquid helium to near rest and trapped\; at sufficiently low temper atures\, the low phonon density in the helium suppresses upscatter. The ele ctron accompanying\nneutron decay produces scintillation in the superfluid helium and can be detected in real time. Previous statistical limitations a s well as systematics related to neutron material bottling will be reduced by\nsignificant increases in field strength and trap volume. Details of ana lyses of the systematics as well as the initial performance benchmarks of t he new apparatus will be presented.\n\n LAST-MODIFIED:20230127T203211Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120413T170000Z DTEND:20120413T180000Z DTSTAMP:20260828T094430Z UID:14gl5c3k3vvkrlb40micqcttd8@google.com CREATED:20120127T181300Z DESCRIPTION:Title : A Sticky Situation: In Situ Chemistry and Mechanics of Barnacle Adhesive Formation and Curing\nSpeaker Name: Kathryn Wahl\nSpeaker Institution : Naval Research Lab\nAbstract : Proteinaceous secretions are widely recognized to be significant contributors to marine biofouling. The resulting interfacial films can be physisorbed or chemisorbed\, and have va rying degrees of permanency – they may be highly polymerized and cross-link ed\, or simply sticky enough to allow surface exploration. Conventional app roaches to examining bioadhesive junctions are forensic in nature – biofoul er removal (separating the surfaces) followed by ex situ examination of the adhesive composition and surface morphology.\nWe have tackled a common mar ine fouler\, the barnacle\, with in situ approaches and tools that allow us to probe the bioadhesive interface as it develops. From these studies\, we have learned that barnacles secrete and cure their adhesive through a mult istage process. In this talk\, I will present examples of how we have appli ed a broad suite of in situ microscopy and spectroscopy approaches to revea l how barnacles form and cure their adhesive\, as well as its properties an d composition. Our in situ approaches include performing temporally- and sp atially-resolved microscopy and spectroscopy through adhesive interfaces tr ansparent at UV\, visible\, IR\, and x-ray wavelengths. We have used these and other materials science tools to extend our understanding of the proper ties and development of the adhesive interface of barnacles. Barnacle adhes ion is promoted by both chemistry and structure at multiple scales. Further \, the proteinaceous adhesive interface is formed in two steps\, with th\ne second process modifying the interfacial chemistry and increasing adhesion twofold. Ultimately\, we aim to use this information to develop better ant ifouling strategies that reduce bioadhesive strength. LAST-MODIFIED:20230127T203534Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221129T180000Z DTEND:20221129T193000Z DTSTAMP:20260828T094430Z UID:3l4bqt3p8s1dfb4t8u71dphqkg@google.com CREATED:20220920T114805Z DESCRIPTION:Speaker: Professor Jordan Horowitz\, Universi ty of Michigan

      Title: \;Bounding Nonequilibrium Response: From B iochemical Sensitivity to Transport in Active Fluids

      Abstract: Diverse physical systems are characterized by their respo nse to small perturbations. Near thermodynamic equilibrium\, the fluctuatio n-dissipation theorem provides a powerful theoretical and experimental tool . Its great utility near equilibrium has led to significant interest in exp anding its validity and developing generalizations for nonequilibrium situa tions. In this talk\, I will introduce a novel parameterization of response that allows us to derive equalities and inequalities that quantitatively c apture the limits to far-from-equilibrium response. As illustrations\, I wi ll show how these predictions rationalize known energetic requirements for some biochemical motifs and provide new limits to others. I will also demon strate how these predictions can be used to derive Green-Kubo relations for the transport coefficients that enter hydrodynamic descriptions of active fluids. \;


      &nb sp\;https://lsa.umich.edu/biophysic s/people/core-faculty/jordan-horowitz-.html LAST-MODIFIED:20221128T172900Z LOCATION:IPST 1116 Conf. Rm. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100324T193000Z DTEND:20100324T203000Z DTSTAMP:20260828T094430Z UID:0lcif78e2devlt9ermlnktiask@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100319T192638Z DESCRIPTION:Title: Making Silicon Go Nonlinear!\n \nBy: Prof. Richard Osgoo d\n Applied Physics and Electrical Engineering\n Columbia University\n \nAbstract:Silicon is a increasingly major player in the materials of the f uture. It dominates electronics\, including microwave\, and it is now begin ning to become the material of choice for integrated optics. In this talk w e show that new applications is growing in nonlinear guided-wave optics. In this case\, Si plays the role of an extremely compact "optical nano fiber on a chip". We discuss the material\, the nanostructure\, the communication s applications\, and finally a new horizon of 2 micrometer on chip sources and their potential applications.\n \n\n LAST-MODIFIED:20230127T203540Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College P ark\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121126T164500Z DTEND:20121126T173000Z DTSTAMP:20260828T094430Z UID:h11h2k2chgro5sp87j6lbe1nm8@google.com CREATED:20121126T151316Z LAST-MODIFIED:20230127T203116Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101018T163000Z DTEND:20101018T173000Z DTSTAMP:20260828T094430Z UID:snkje2db743mfns1iskqq53o6c@google.com CREATED:20100825T185413Z DESCRIPTION:Title: TBA\nSpeaker: Poul Jessen\, University of Arizona\nAbstr act: TBA LAST-MODIFIED:20230127T203833Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T150000Z DTEND:20221208T160000Z DTSTAMP:20260828T094430Z UID:1reg7kgljbi1jcooq8o0scrrbn@google.com CREATED:20221203T003702Z DESCRIPTION:Title:  Lattice-Based Quantum Advantage from Rotated Mea surements
      Speaker:  Carl Miller (QuICS)
      Time:  Thursday\, December 8\ , 2022 - 10:00am
      Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390

      Previous work by Brakerski et al. (2018) described a 2-party interactive protocol th at enables one party to prove that they have quantum computational abilitie s. The protocol is based on the Learning With Errors (LWE) assumption\, a s tandard computational hardness assumption from classical cryptography. In t his talk\, I will give an introduction to the protocol of Brakerski et al.\ , and then I will discuss a recent paper of ours that optimizes their proto col and brings it closer to experimental realization. The optimization is b ased on the use of qubit rotations around the Z-axis at an intermediate sta ge of the protocol. I will also discuss how the same approach improves prot ocols for remote state preparation.

      Reference: Y. Alnawakhtha\, A. M antri\, C. Miller\, D. Wang\, “Lattice-Based Quantum Advantage from Rotated Measurements\,” arXiv:2210.10143 (2022).

      (Refreshments will be prov ided.) LAST-MODIFIED:20221203T003702Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/97880726390 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Carl Miller TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100224T170000Z DTEND:20100224T180000Z DTSTAMP:20260828T094430Z UID:s8fumphkbokgujadgij90c6pv4@google.com CREATED:20100217T144904Z DESCRIPTION:Title : AppEl Seminar - Nanoscale Electrodynamics of Supercondu ctors and Other Materials with Radically New Forms of Microwave Microscopy\ nSpeaker Name: Steven Anlage\nSpeaker Institution : UMD - Physics LAST-MODIFIED:20230127T203343Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100421T150000Z DTEND:20100421T160000Z DTSTAMP:20260828T094430Z UID:bslhc7id1vljh4kqj71cjt1th0@google.com CREATED:20100420T163807Z DESCRIPTION:Title: Effects of Molecular-Scale Density Fluctuations and Surf ace Roughness on Hydrophobic Hydration\n\nSpeaker: Dr. Gerhard Hummer\, La boratory of Chemical Physics\, NIH LAST-MODIFIED:20230127T203544Z LOCATION:Room 0112\, Marker Seminar Room\, Chemistry Building (091) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYSICAL CHEMISTRY SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090225T210000Z DTEND:20090225T223000Z DTSTAMP:20260828T094430Z UID:397esmddhffhb1c8l12ggv99lc@google.com CREATED:20090223T153305Z DESCRIPTION:Title: New TeV Gamma Sources and a Surprising Cosmic Ray Anisot ropy - Recent Results from Milagro\nSpeaker: Prof. Jordan Goodman\, Univers ity of Maryland LAST-MODIFIED:20230127T203853Z LOCATION:Physics Building\, Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081017T180000Z DTEND:20081017T190000Z DTSTAMP:20260828T094430Z UID:l804li8ok741shlif00d4i0o8s@google.com CREATED:20081010T151547Z DESCRIPTION:Title: Numerical Simulations of Black Holes\nSpeaker: Frank Her rmann\, University of Maryland\nMore Information: eracine@umd.edu LAST-MODIFIED:20230127T203305Z LOCATION:Physics Building\, Room 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130916T203000Z DTEND:20130916T213000Z DTSTAMP:20260828T094430Z UID:ht0a5daddhn63018fm4b7fkk5c@google.com CREATED:20130916T183148Z DESCRIPTION:Title : Propagation of Cosmic Rays in the Galaxy\nSpeaker Name: Vladimir Ptuskin\nSpeaker Institution : IZMIRAN\, Russia\nNotes: Tea and C ookies 4:15-4:30pm\n\n LAST-MODIFIED:20230127T203550Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121001T163000Z DTEND:20121001T173000Z DTSTAMP:20260828T094430Z UID:migd0gjnshslipvdftd4jto7e0@google.com CREATED:20120927T135216Z DESCRIPTION:Title: Integrated quantum spin systems\nSpeaker: Jorg Wrachtrup \, University of Stuttgart\nAbstract: Magneto optically active quantum syst ems combine the best of two worlds: versatile photon interfaces and excelle nt coherent control of spins. When combined with other degrees of freedom l ike mechanical oscillators\, plasmonic structures etc. they can become a co rnerstone in hybrid quantum devices. The talk will describe our efforts tow ards integrating rare earth ions or diamond defect center spins into larger functional units by exploiting e.g. nano positioning to generate spin arra ys or integrating quantum emitters with nano plasmonic structures. Possible applications in e.g. quantum enhanced sensing will be discussed. \n\n LAST-MODIFIED:20230127T203711Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-Seminar - Jorg Wratchrup TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T210000Z DTEND:20221116T220000Z DTSTAMP:20260828T094430Z UID:4dv7rbhj6gmss6cre0st2l64h6@google.com CREATED:20221111T132437Z DESCRIPTION:
      Speaker: Agnieszka Leszczynska - University of Delaware

      Title: Extensive air showers at IceTop and IceCube

      The phenomenon of extensive air showers (EASs) has been the subject of many studies ever since its discovery. Due to bulk of secondary particles that are created in these cascades one can detect them using an array of particl e detectors\, like IceTop. Detailed understanding of the EAS development is crucial in reconstructing the properties of the primary particle. However\ , the current Monte Carlo simulations apply phenomenological assumptions to describe high-energy hadronic multiparticle production. This\, together wi th a stochastic nature of EAS\, results in large uncertainties for interpre ting observations from EAS arrays. IceTop and IceCube provide unique possib ilities to probe EAS development. The main strength comes from the simultan eous measurements of the dominant electromagnetic particles and low-energy muons at the surface and highly-energetic muonic core in the ice. Deeply pe netrating muon bundles originate mainly from the early stages of the EAS de velopment\, hence can be used to constrain the hadronic models and provide new ways of inferring the primary particle properties. In this talk I will summarize different EAS studies with IceTop and IceCube.       LAST-MODIFIED:20221111T132929Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Particle Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130522T190000Z DTEND:20130522T200000Z DTSTAMP:20260828T094430Z UID:m8v0lkvpj93b77m7cthgj7v50g@google.com CREATED:20130507T172457Z DESCRIPTION:Title: "Axion Detection with NMR"\nSpeaker: Peter Graham\nInsti tution: Stanford University\nAbstract: \nThe axion is a well-motivated dark matter candidate\, but is challenging to search for. We propose a new way to search for QCD axion and axion-like-particle (ALP) dark matter. Nuclei that are interacting with the background axion dark matter acquire time-va rying CP-odd nuclear moments such as an electric dipole moment. In analogy with nuclear magnetic resonance\, these moments cause precession of nuclea r spins in a material sample in the presence of a background electric field . This precession can be detected through high-precision magnetometry. Wi th current techniques\, this experiment has sensitivity to axion masses bel ow 10^-9 eV\, corresponding to theoretically well-motivated axion decay con stants around the grand unification and Planck scales. With improved magne tometry\, this experiment could ultimately cover the entire range of masses below 10^-6 eV\, just beyond the region accessible to current axion search es. A discovery in such an experiment would not only reveal the nature of dark matter and confirm the axion as the solution of the strong CP problem\ , but would also provide a glimpse of physics at the highest energy scales\ , far beyond what can be directly probed in the laboratory.\n\n LAST-MODIFIED:20230127T203534Z LOCATION:4102 Physics Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221026T193000Z DTEND:20221026T203000Z DTSTAMP:20260828T094430Z UID:4r07q0o78a584iq3ioohha85vj@google.com CREATED:20221011T165704Z DESCRIPTION:Speaker: Dr. Valentin Rodionov\, Case Western Reserv e

      Title: \;Synthesis and Characterization of γ-Graphyne\, a Novel Allotrope of Carbon

      Abstract:  \;The unique ability of carbon to bond with itself forming ext ended chains and networks underlies the structural complexity of organic ma tter. This complexity extends to elemental carbon. Several hundred crystall ine carbon phases have been theoretically predicted to date. However\, few of these materials have been realized experimentally. Advances in the synth esis of nonbenzenoid and sp1-containing allotropes have been especially lim ited. One of such allotropes is γ-graphyne\, an sp2/sp1 \;carbon lattic e which can be viewed as graphene uniformly expanded through insertion of t wo-carbon acetylenic units.1 \;γ-Graphyne \;is predicted to be a se miconductor with a moderate band gap\, ultrafast charge carrier mobility co mparable to that of graphene\, and high thermal conductivity.2 \;Recent ly our group reported the synthesis of multilayer γ-graphyne through crysta llization-assisted irreversible polymerization.3 \;While conventional 2 D polymerizations and reticular chemistry rely on error correction through reversibility\, we demonstrated that a covalent lattice of high quality can be synthesized under purely kinetic control. Initial experiments indicate that γ-graphyne is a semiconductor with a bandgap of ~0.5 eV. The crystal s tructure features aperiodic sheet stacking with an interlayer distance of 3 .48 Å. The material is thermally stable up to 240 °C but undergoes a rapid photochemical transformation under green or longer-wavelength light. \; In this presentation\, I shall discuss our recent progress in exploring the physical and chemical properties of this novel form of carbon.

      References

      (1) Baughman\, R. H.\; Eckhardt\, H.\; Kertesz\, M. S tructure‐property predictions for new planar forms of carbon: Layered phase s containing sp2 \;and sp atoms. \;J. Chem. Phys. \;1987\,  \;87 \;(11)\, 6687-6699. DOI: 10.1063/1.453405.

      (2) Kang\, J.\; W ei\, Z.\; Li\, J. Graphyne and Its Family: Recent Theoretical Advances.&nbs p\;ACS Appl. Mater. Interfaces \;2019\, \;11 \;(3)\, 2692-2706. DOI: 10.1021/acsami.8b03338.

      (3) \;Desyatkin\, V. G.\; Martin\, W. B.\; Aliev\, A. E.\; Chapman\, N. E.\; Fonseca\, A. F.\; Galvao\, D. S.\ ; Miller\, E. R.\; Stone\, K. H.\; Wang\, Z.\; Zakhidov\, D.\; et al. Scala ble Synthesis and Characterization of Multilayer γ-Graphyne\, New Carbon Cr ystals with a Small Direct Band Gap. \;J. Am. Chem. Soc. \;2022\,&n bsp\;144(39)\, 17999-18008. DOI: 10.1021/jacs.2c06583.

       LAST-MODIFIED:20221018T182259Z LOCATION:Chemistry Building\, Room 1228 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221121T200000Z DTEND:20221121T213000Z DTSTAMP:20260828T094430Z UID:7s3m80kjbrutimtjpurnvdsos0@google.com CREATED:20220823T191659Z DESCRIPTION:Speaker: Kim Berghaus\, Stony Brook


      Title : The Migdal Effect in Semiconductors for Dark Matter with Masses below ∼ 1 00 MeV \;  \;

      Abstract: Dark matter scattering off a nucleus has a small probability of inducing an observable ionization through the i nelastic excitation of an electron\, called the Migdal effect. In this talk I will show how to use an effective field theory to extend the computation of the Migdal effect in semiconductors to regions of small momentum transf er to the nucleus\, where the final state of the nucleus is no longer well described by a plane wave. The analytical result can be fully quantified by the measurable dynamic structure factor of the semiconductor\, which accou nts for the vibrational degrees of freedom (phonons) in a crystal. I will s how that\, due to the sum rules obeyed by the structure factor\, the inclus ive Migdal rate and the shape of the electron recoil spectrum is well captu red by approximating the nuclei in the crystal as free ions\; however\, the exclusive differential rate with respect to energy depositions to the crys tal depends on the phonon dynamics encoded in the dynamic structure functio n of the specific material. \; Our results allow the Migdal effect in s emiconductors to be evaluated even for the lightest dark matter candidates (mχ >\;~ 1 MeV) that can kinematically excite electrons.       LAST-MODIFIED:20221117T175350Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221025T160000 DTEND;TZID=America/New_York:20221025T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221025T160000 CREATED:20210423T130624Z DESCRIPTION:
      Emily A. Carter\, Prin ceton University and Princeton Plasma Physics Laboratory

      How Quantum Mechanics Helps Identify Mechanisms and Discover Materials to Combat Climate Change

      4 p.m.\, with pre-lecture socialization at 3:30 p.m.

      Questions? Contact Meredith Pettit at mpettit1@umd.edu or 301.405.4951.

      Each ye ar that passes now brings more evidence that carbon dioxide and methane emi ssions are bringing our world closer to a tipping point beyond which it is unclear how humans and other living creatures will survive. I have been dri ven by this concern for the last 15 years. I decided a decade and a half ag o to reorient all my research to work on sustainable energy solutions. I am a physical chemist by training\, with expertise in quantum mechanics metho ds development and applications primarily related to materials science and chemistry. While I still work on sustainable energy\, it is now evident tha t such solutions are not enough. We must stop emitting additional carbon in to the atmosphere\; we must go not just to zero but to negative emissions\, in order to mitigate against worsening climate change caused by nearly a c entury and a half of fossil fuel extraction and burning. Thus\, in addition to materials discovery for sustainable\, carbon-free electricity (e.g.\, s olar cells\, fusion\, solid oxide fuel cells)\, I work on catalyst discover y for renewable fuels\, via (electro/solar thermo)-chemical water splitting and (photo/electro/solar thermo)-chemical carbon dioxide reduction. If we can produce liquid fuels from carbon dioxide and water – effectively runnin g combustion backwards – via innovative catalysts that take in sunlight or carbon-free excess electricity\, we will recycle carbon rather than extract and add more of it to the atmosphere and oceans. However\, recycling carbo n dioxide and methane is still not enough. We must convert and store carbon dioxide and methane permanently. Rather than focus on subsurface sequestra tion of carbon dioxide\, let’s find more productive—and less risky—uses for CO2. In this talk\, I will describe research related to carbon cycling back to fuels and useful chemicals\, along with a vision for gettin g to negative emissions enabled by electrocatalysis. These approaches\, alo ng with available and emerging strategies in agriculture\, forestry\, and c onstruction materials\, may let our grandchildren and their descendants sti ll enjoy the world we have been lucky enough to inhabit up to now. I hope t hat my talk will inspire others to join the effort.

      About the Speaker

      Professor Emily Carter is a theorist/computational scientist firs t known in her independent career for her research combining ab initio quantum chemistry with molecular dynamics and kinetic Monte Carlo simula tions\, especially as applied to etching and growth of silicon. Later\, she utilized quantum mechanics\, applied mathematics\, and solid state physics to construct a diverse set of advanced simulation methods based on quantum mechanics: (i) linear-scaling orbital-free\, density-functional theory (OF DFT) that can simulate unprecedented numbers of atoms quantum mechanically\ ; (ii) embedded correlated wavefunction theories that combine quantum chemi stry with periodic DFT to compute accurately condensed matter ground and ex cited electronic states\, charge-transfer phenomena\, and strongly correlat ed materials (furnishing\, e.g.\, the first ab initio view of the ma ny-body Kondo state of condensed matter physics and treatment of charge tra nsfer and excited states of adsorbates on surfaces important for photo/elec trocatalysis)\, and (iii) fast algorithms for ab initio multi-refere nce correlated electronic wavefunction methods that permit accurate thermoc hemical kinetics and excited states to be predicted for large molecules. Sh e was a pioneer in quantum-based multiscale simulations of materials that e liminate macroscopic empirical constitutive laws and that led to new insigh ts into\, e.g.\, shock Hugoniot behavior of iron and stress-corrosion crack ing of steel. Earlier\, her doctoral research furnished new understanding o f homogeneous and heterogeneous catalysis\, while her postdoctoral work pre sented the condensed matter simulation community with the widely used rare event sampling method known as the Blue Moon Ensemble. Her research into h ow materials fail due to chemical and mechanical effects furnished proposal s for how to optimally protect these materials against failure (e.g.\, by d oping\, alloying\, or coating). Her work\, especially on optimizing therma l barrier coatings for jet turbine engines\, unraveled long-standing myster ies as to the roles of various alloying elements in those coatings.

      Her current research includes the development of efficient and accurate quantum mechanics simulation techniques such as her embedded corre lated wave function theories and multi-level quantum simulation methods. Sh e uses these techniques now mainly to elucidate mechanisms of photo- and el ectro-catalysis\, aimed at discovery and design of optimal catalysts for ca rbon dioxide utilization and more recently solid sequestration\, as could b e enabled by excess renewable energy.

      The 2022 Paint Branch Lecture is sponsored by Professor Ed Ott.

      < /u>       LAST-MODIFIED:20221018T122335Z LOCATION:A. James Clark Hall\, Room 1101 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium/Paint Branch Distinguished Lecture in Applied Ph ysics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20100419 DTEND;VALUE=DATE:20100420 DTSTAMP:20260828T094430Z UID:pcubjor1he6b1k3re56833djk0@google.com CREATED:20100402T132426Z DESCRIPTION:http://www.jhuapl.edu/APLNano/ LAST-MODIFIED:20230127T203042Z LOCATION:Kossiakoff Center on the main APL campus in Laurel MD SEQUENCE:0 STATUS:CONFIRMED SUMMARY:2010 Mid-Atlantic Regional JHU/APL Nanomaterials Symposium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131108T160000Z DTEND:20131108T170000Z DTSTAMP:20260828T094430Z UID:k31m0hco7j89rd2ds05ujnis3k@google.com CLASS:PUBLIC CREATED:20131107T153529Z DESCRIPTION:Speaker: John Close\, Australian National University\nTitle: Pr ecision Inertial Measurement with Cold Atoms\n\nAbstract:\nThis talk will b e an introduction to precision inertial measurement with cold atoms includi ng a brief review of the current state of the art. I will present our resu lts on the comparison of atom laser sources\, thermal sources\, and guided and unguided atom interferometry. I will also discuss our program to demons trate a continuous atom laser\, large atom number squeezing\, high flux ato mic sources and large momentum transfer beam splitters. We are developing these techniques and will apply them to improve on current state of the art precision inertial measurement. LAST-MODIFIED:20230127T203201Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special AMO Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120314T181500Z DTEND:20120314T191500Z DTSTAMP:20260828T094430Z UID:mepqrj0atn5onhg2jo9b740ivk@google.com CREATED:20120206T191503Z DESCRIPTION:SPEAKER: Madappa Prakash - Clippinger Res Labs\, Ohio Univ\, A thens \nTITLE: Rapid Cooling of the Neutron Star in Cassiopeia-A \nABSTRAC T: Ten years of Chandra observations of the neutron star ``Cas A'' have re vealed that it is cooling rapidly\, an unusual behavior never observed prev iously. We present a natural explanation based on neutron superfluidity an d proton superconductivity. These quantum phenomena set in when the tempera ture drops below some critical value. We propose that neutrons inside Cas A are presently developing a superfluid phase and emitting copius amounts o f neutrinos which are cooling the star. Cas A has an age of 330 yrs and no other neutron star is known that is young enough to observe the onset of s uperfluidity. From Cas A's age\, we deduce the neutron p-wave superfluid c ritical temperature to be a half billion degrees. Furthermore\, the combina tion of the star's high surface temperature\, about 2 million degrees\, and large cooling rate implies that protons are in an s-wave superconducting s tate. The transition to superconductivity has a larger critical temperature because it occurred prior to now when the star's core was warmer. This is the first direct evidence that these phenomena\, predicted by theoretical models of high energy-density matter\, occur within neutron stars.\n\n\n LAST-MODIFIED:20230127T203631Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081020T180000Z DTEND:20081020T190000Z DTSTAMP:20260828T094430Z UID:gp256f42k0p6iripb4e07fskdo@google.com CREATED:20080912T182504Z DESCRIPTION:Speaker:Rabindra Mohapatra\, University of Maryland\nTitle:"A n ew way to understand the origin of matter in the universe"\n LAST-MODIFIED:20230127T203242Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110223T144500 DTEND;TZID=America/New_York:20110223T154500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110223T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "The Electro-Weak Scale: Key to the Origin of Visible a nd Dark Matter?"\n[Speaker] Stefano Profumo\, a candidate of UMD-JSI & Part icle Theory faculty position\n[Institution] University of California\, Sant a Cruz\n[Abstract] New physics at the electro-weak scale might unlock the m ysteries of the generation of the (baryonic) matter-antimatter asymmetry an d of the particle nature of dark matter. I will review recent progress on u nderstanding baryogenesis at the electro-weak phase transition\, and the mu ltitude of experimental tests that this scenario offers\, including collide r\, gravity waves and electric dipole moment searches. I will argue that th is scenario is firmly falsifiable\, with a time-line of only a few years. I will then discuss searches for weak-scale particle dark matter in astrophy sical data\, including an updated review of controversial signals in cosmic -ray and gamma-ray data. I will address the question of whether it is feasi ble to learn about New Physics "from the Sky"\, and outline theoretical and observational strategies for a road-map towards the discovery of the \nnat ure of dark matter.\n LAST-MODIFIED:20230127T203416Z LOCATION:1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JSI & EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081121T180000Z DTEND:20081121T190000Z DTSTAMP:20260828T094430Z UID:shrkv2cgdiid0pkce7s5047sns@google.com CREATED:20081107T202146Z DESCRIPTION:Title: High-Temperature Processing of Microwave Dielectric Cera mics: In Situ Studies Using Neutron and Synchrotron X-Ray Powder Diffractio n\nSpeaker: Dr. Richard IbbersonISIS-Rutherford Appleton Laboratory\n LAST-MODIFIED:20230127T203334Z LOCATION:2108 Chem and Nuc. Engineering Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090401T200000Z DTEND:20090401T210000Z DTSTAMP:20260828T094430Z UID:kpeccs828nl3tf1inptd6msom4@google.com CREATED:20090325T191555Z DESCRIPTION:Title: Monoenergetic Proton Acceleration by Intense Laser Beams \nSpeaker: Dr. Bengt Eliasson\, Ruhr University Bovhum LAST-MODIFIED:20230127T203650Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090511T163000Z DTEND:20090511T173000Z DTSTAMP:20260828T094430Z UID:ii88f0n51l4l4ul0lp41pakue0@google.com CREATED:20090202T164654Z DESCRIPTION:Title: Decoherence-enhanced measurements\nSpeaker: Daniel Braun \, Sabatier University\, Toulouse\, France LAST-MODIFIED:20230127T203757Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221011T200000Z DTEND:20221011T220000Z DTSTAMP:20260828T094430Z UID:1d7i8sr5ar7ujtcdt3ids0bpp2@google.com CREATED:20220815T134945Z DESCRIPTION:Speaker: Professor Cristina Marchetti\, University o f California\, Santa Barbara

      Title: \;      The Physics of Active Matter

      Abstract: \;      Birds flock\, bees swarm and fish school. These are just som e of the remarkable examples of collective behavior found in nature. Physic ists have been able to capture some of this behavior by modeling organisms as "flying spins" that align with their neighbors according to simple but n oisy rules. Successes like these have spawned a field devoted to the physic s of active matter—matter made not of atom and molecules but of entities th at consume energy to generate their own motion and forces. Through interact ions\, collectives of such active particles organize in emergent structures on scales much larger than that of the individuals. There are many example s of this spontaneous organization in both the living and non-living worlds : motor proteins orchestrate the organization of genetic material inside ce lls\, swarming bacteria self-organize into biofilms\, epithelial cells migr ate collectively to fill in wounds\, engineered microswimmers self-assemble to form smart materials. In this lecture I will introduce the field of act ive matter and highlight ongoing efforts by physicists\, biologists\, engin eers and mathematicians to model the complex behavior of these systems\, wi th the goal of identifying universal principles. LAST-MODIFIED:20220928T175653Z LOCATION:https://umd.zoom.us/webinar/register/WN_YxUiCS4gSrKpOXYJhvV9TQ SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Shih-I Pai Lecture/Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081008T193000Z DTEND:20081008T203000Z DTSTAMP:20260828T094430Z UID:53e2s11lv6ol8l7odg99sjbrr0@google.com CREATED:20080929T152113Z DESCRIPTION:Title: Probing Anomalous Two-level Systems with a Cooper-pair Box\nSpeaker: Dr. Ben Palmer LAST-MODIFIED:20230127T203023Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221018T160000 DTEND;TZID=America/New_York:20221018T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221018T160000 CREATED:20210423T130624Z DESCRIPTION:Jay Sau\, University of Maryland

      Progress Towards topological quantum compu tation using Majorana fermions

      Topology has turned into a guiding principle that is used to understand the properties o f quantum many-body systems in condensed matter physics. One of the most ta ntalizing applications of these ideas that has been proposed so far is topo logical quantum computation\, which uses topological principles to stabiliz e quantum degrees of freedom against environmental decoherence. I will star t by reviewing briefly work that started during my postdoctoral research th at led to the prediction of a platform for topological quantum computation (TQC) using Majorana modes in topological superconductors. The simplicity o f this class of systems has resulted in several experimental attempts\, whi ch have successfully observed preliminary evidence for the Majorana zero mo des in the form of nearly quantized zero-bias conductance peaks. The next s tep has proven more complicated\, which is understood to be a result of com petition from on-topological quasi-Majorana states. I will then summarize m y recent work where we are trying to move this field forward by proposing s ystematic approaches to separate such false positives as well as identify i ssues such as disorder that maybe obstructing progress. These ideas are als o finding application in other approaches to TQC involving new materials su ch as iron-based topological superconductors and quantum Hall/superconducto r interfaces. The intense effort on what appears to be a long challenging p ath is worthy because TQC using topological superconductors is currently th e only scalable proposal on the horizon for quantum computation.



       LAST-MODIFIED:20220927T144025Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221108T210000Z DTEND:20221108T220000Z DTSTAMP:20260828T094430Z UID:2556v8jpn3oe6t6n3d64gluu61@google.com CREATED:20221101T170628Z DESCRIPTION:Addressing Stress and Mental Health i n Graduate Education

      Phil Buhlmann\, University of Minnesota

      Our department makes stress and mental health a major point of attention for our graduate program. Our approach i s not to lower the bar for the PhD degree. Instead\, we strive to eliminate unnecessary sources of stress and create conditions in which students feel engaged\, supported\, and empowered. The key to our initiative lies in con tributions from students\, staff\, faculty\, and the university health serv ices. While only professionals can provide therapy\, three chemistry facult y members serve as Mental Health Advocates and help to direct faculty\, sta ff\, and students to relevant resources. Students formed the group Communit y of Chemistry Graduate Students (CCGS)\, which organizes regular events on physical and mental health and stress management. To reach out to students outside the department\, the CCGS also prepared a range of insightful vide os on the topics of mental health in graduate school\, academic success\, a nd the transition into a job after graduate school. CCGS representatives an d the department also worked with university health services to develop bia nnual surveys that help us better understand sources of stress. The survey taught us a lot about our students and\, within a relatively short time\, a llowed us to improve a range of graduate program procedures. \;< /p>

      (1) Stress and mental health in graduate school: How student empowerment creates lasting change\, Mousavi\, M. P. S.\; Sohrabpou r\, Z.\; Anderson\, E. L.\; Stemig-Vindedahl\, A.\; Golden\, D.\; Christens on\, G.\; Lust\, K.\; Bühlmann\, P. J. Chem. Ed. 2018\, \;95\, 1939–1946.  \;

      (2) https://s ites.google.com/umn.edu/ccgs?pli=1



      Hosted by the Graduate Student Mental Health Task Force       LAST-MODIFIED:20221101T172716Z LOCATION:1410 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101013T193000Z DTEND:20101013T203000Z DTSTAMP:20260828T094430Z UID:264sir1nkuuuevl18i8m5mdcek@google.com CREATED:20101008T172752Z DESCRIPTION:Title: Coherence of Donor Electron Spins in Isotopically Enrich ed Silicon\n \nWayne Witzel\nSandia National Labs\n \nSilicon is promising for spin-based quantum computing because nuclear\nspins\, a source of magne tic noise\, may be nearly eliminated through\nenrichment. However\, any Si device is expected to contain some\nphosphorus donor impurities. These do nors generate magnetic noise\nthrough spin dynamics\, induced by dipolar in teractions\, that conserve\nZeeman and hyperfine energies. Ironically\, in creasing the number of nuclear\nspins will suppress this decoherence mechan ism by effecting more hyperfine energy\nvariation (i.e.\, Overhauser shifts ). We study spin coherence decay as a\nfunction of donor concentration\, $ ^{29}$Si concentration\, and temperature using\ncluster expansion technique s specifically adapted to the problem of a sparse\nelectron spin bath.\n LAST-MODIFIED:20230127T203837Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091016T150000Z DTEND:20091016T160000Z DTSTAMP:20260828T094430Z UID:njv4kn60ibhv3956b3p8u6ffro@google.com CREATED:20091005T173847Z DESCRIPTION:Title: Fingerprint Recognition\n \nSpeaker: Anil K. Jain\, Depa rtment of Computer Science and Engineering\nMichigan State University\n\nAB STRACT:\n \n The skin on human palm and feet has a regular and dense pa ttern of interlaced ridges and valleys. These ridges\, called friction ridg es are claimed to be unique to each finger. Given the current world populat ion of ~6.7 billion\, there are about 67 billion different fingerprint patt erns. In principle\, everyone on this planet can be uniquely identified bas ed on their fingerprints! Even identical twins can be differentiated based on their fingerprints. Superficial injury to the finger surface only change s the pattern in the local region temporarily\; ridge structure reappears a fter the skin heals. It is the uniqueness and persistence properties of fin gerprint ridge patterns that have made them as a universally accepted metho d for person identification by law enforcement agencies worldwide for over one hundred years. Growing concerns related to national security and financ ial fraud have resulted in an increased reliance on fingerprint recognition in government and commercial applications (US-VISIT\, laptop logon and Dis ney park access). Fingerprint is preferred in these applications compared t o other competing biometric traits (face\, iris and voice) because of its p roven performance over time\, large legacy databases and availability of co mpact and low cost fingerprint sensors. But\, fingerprint recognition has i ts own limitations and challenges. Further\, wide adoption of fingerprint r ecognition technology in many sectors of our society has also raised legiti mate concerns about their recognition accuracy particularly for large scale applications (hundreds of millions of users)\, uniqueness\, system securit y\, and user privacy. This talk will present an introduction to fingerprint recognition\, emerging applications and research challenges. LAST-MODIFIED:20230127T203005Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series on Vision TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111014T190000Z DTEND:20111014T200000Z DTSTAMP:20260828T094430Z UID:aaf5m2p18cdm449ts2g70qsq6k@google.com CREATED:20111012T144334Z DESCRIPTION:Speaker: Thomas Murphy\, University of Maryland\nTitle: Chaotic Synchronization in Optical Networks LAST-MODIFIED:20230127T203709Z LOCATION:Kim Engineering building\, room 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Booz Allen Hamilton Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100415T140000Z DTEND:20100415T150000Z DTSTAMP:20260828T094430Z UID:l7545aboa54m40svt8lmkcqfd4@google.com CREATED:20100408T132203Z DESCRIPTION:Title: Path Ensembles for Conformational Transitions in Protein s: Path Heterogeneity\, Steady States\, and Symmetry\n\nPresented by Divesh Bhatt\nUniversity of Pittsburgh School of Medicine\n\nAbstract: We study c onformational transitions in semi-atomistic models of adenylate kinase usin g weighted ensemble path sampling method. Adenylate kinase shows two dictin ct conformations—Open and Closed—and we study transitions in both the direc tions by generating full path ensembles. The path ensembles show significan t heterogeneity\, and two distinct pathways are obtained. We find that the qualitative picture of the path ensembles remains unchanged upon inclusion of additional chemical details into our semi-atomistic models. We further p resent a novel result that establishes the formal conditions necessary to o bserve symmetry in forward and reverse path ensembles in system under non-e quilibrium steady states. We analyze the path ensembles of adenylate kinase in the light of such a symmetry\, and investigate the practical conditions that lead to observing the symmetry. A presence of such a symmtery has sig nificant computational implications on systems for which transitions are ea sier to obtain in one direction—such as ligand unbinding versus binding. LAST-MODIFIED:20230127T203547Z LOCATION:Room 1105\, Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Bioengineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131125T200000Z DTEND:20131125T210000Z DTSTAMP:20260828T094430Z UID:qlump7i3c9d8sm9mlj3spqh6sg@google.com CREATED:20131106T164335Z DESCRIPTION:Integrating inquiry-based undergraduate instruction with facult y research: a biology assistant professor's experience\nTadashi Fukami\, De partment of Biology at Stanford University\nAbstract: Recent concerted effo rts in the US to improve undergraduate biology education led to increased a ppreciation of the value of "inquiry-based" instruction modeled on real-wor ld scientific practice. However\, inquiry-based instruction has not been ad opted very widely in place of traditional "cookbook" instruction\, where st udents follow lab manuals to reach known answers. One problem hindering the change may be insufficient time and resources for faculty to undertake new ways of teaching when they are under pressure to maintain productive resea rch. It has been suggested that a viable solution to this problem is to bui ld inquiry-based courses on faculty research programs\, essentially combini ng teaching and research as synergistic activities. In my talk\, I will des cribe how I became involved in such an effort as an assistant professor at Stanford University. In particular\, I hope to share some of what we have t ried and learned through redesigning of a large ecology lab course.\nFor mo re information go to http://cmns-tlc.umd.edu/Tadashi LAST-MODIFIED:20230127T203727Z LOCATION:Biology-Psychology Building\, Room 1250 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Visiting Teacher/Scholar series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120131T120000 DTEND;TZID=America/New_York:20120131T130000 RRULE:FREQ=WEEKLY;UNTIL=20120214T170000Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:aup3qs4q9j4cektnigdh623aa8@google.com CREATED:20120119T153520Z LAST-MODIFIED:20230127T203454Z LOCATION:Large Conference Room (1207)\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090615T190000Z DTEND:20090615T200000Z DTSTAMP:20260828T094430Z UID:gka1orams70kh0ee3ch7crm99o@google.com CREATED:20090602T191901Z DESCRIPTION:Title: Cosmic-Ray Signatures of Dark Matter Decay\nSpeaker: Dav id Tran\, Technical University Munich\, Germany\n\nAbstract: Astrophysical and cosmological observations do not require\nthe dark matter particles to be absolutely stable. If they are indeed\nunstable\, their decay into posit rons might occur at a sufficiently\nlarge rate to allow the indirect detect ion of dark matter through an\nanomalous contribution to the cosmic positro n flux. In this talk we\ndiscuss the implications of the excess in the posi tron fraction\nrecently reported by the PAMELA collaboration for the scenar io of\ndecaying dark matter\, and in particular for the scenario of decayin g\ngravitinos. We also discuss the constraints on this scenario from\nmeasu rements of the antiproton flux and the predictions for the diffuse\ngamma- ray flux.\n LAST-MODIFIED:20230127T202943Z LOCATION:4102 PHYS SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100921T200000Z DTEND:20100921T210000Z DTSTAMP:20260828T094430Z UID:ss0bh08n4j3pc3qkparav8827g@google.com CREATED:20100825T173728Z DESCRIPTION:Speaker: Frank van den Bosch\, Yale University\nTitle: Shedding Light on the Dark: How the Galaxy-Dark Matter Connection Constrains Both C osmology and Galaxy Formation LAST-MODIFIED:20230127T203257Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091023T180000Z DTEND:20091023T190000Z DTSTAMP:20260828T094430Z UID:lobnc698l19hclas3r4595b17s@google.com CREATED:20091021T154117Z DESCRIPTION:Title: "Just How Complicated Can a Power System Be?"\nSpeaker: Dr. James Thorp\nProfessor and Department Head\, Electrical and Computer En gineering\, Virginia Tech University LAST-MODIFIED:20230127T203306Z LOCATION:Jeong H. Kim Engineering Bldg.\, Rm. 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Booz Allen Hamilton Distinguished Colloquium in Electrical and Comp uter Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090225T190000Z DTEND:20090225T200000Z DTSTAMP:20260828T094430Z UID:2e1frlheuvndo0uvbneaesd25k@google.com CREATED:20090202T182633Z DESCRIPTION:Title: Control of Small Things: From Steering Cells on Chips to Targeting Drugs to Deep Tumors\nSpeaker: Professor Benjamin Shapiro \, Dep artment of Aerospace Engineering\, University of Maryland LAST-MODIFIED:20230127T203630Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110406T151500 DTEND;TZID=America/New_York:20110406T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110406T151500 CREATED:00010101T000000Z DESCRIPTION:[Title] "Honey\, LIGO's on the phone!"\n[Speaker] Jonah Kanner \n[Institution] University of Maryland\n[Abstract] During 2009 and 2010\, t he kilometer scale interferometers known as\nLIGO and Virgo simultaneously observed the skies for transient gravitational wave signals. Nearly real-t ime software analyzed data from this global network to estimate the source positions of gravitational wave triggers with only a few minutes of latency . To search for potential optical afterglows of candidate gravitational wa ve sources\, an on-call team of experts inspected each gravitational wave t rigger to decide if robotic telescopes should be used to observe the estima ted source position of the candidate.\n\nThis talk will discuss the motivat ion and methodology of the search\, the ability of gravitational wave detec tors to localize events on the sky\, and the joys and challenges of working with an experiment that sometimes calls in the middle of the night.\n LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081022T180000Z DTEND:20081022T190000Z DTSTAMP:20260828T094430Z UID:m09tme8q7nt30125m9otlm48uc@google.com CREATED:20081020T204557Z DESCRIPTION:Speaker: Dr. Robert Lin of UC-Berkeley's Space Science Laborato ries\nTitle: Particle Acceleration and Explosive Energy Release by the Sun LAST-MODIFIED:20230127T203636Z LOCATION:Conference Room 2400 of the CSS Building (coffee and tea @ 1:45) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics - Space and Cosmic Ray Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101103T140000Z DTEND:20101103T190000Z DTSTAMP:20260828T094430Z UID:rctb5vqbubcvmq1fjp4qd9sep4@google.com CREATED:20101021T192607Z DESCRIPTION:Title : CMTC Fall Symposium\nNotes: program: http://www.physics .umd.edu/cmtc/seminars/CMTC%20Symposium%20Fall%202010.pdf LAST-MODIFIED:20230127T203643Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081120T173000Z DTEND:20081120T183000Z DTSTAMP:20260828T094430Z UID:66olpegic91th7qd2b865sqado@google.com CREATED:20081119T161848Z DESCRIPTION:Title: Three 12 min talks on Fluid Dynamics\nSpeaker: Doug Kell ey\, UMD\; Santiago Triana\, UMD\; Tess Homan\, University of Twente LAST-MODIFIED:20230127T203711Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090902T190000Z DTEND:20090902T203000Z DTSTAMP:20260828T094430Z UID:a7sp9hq7mhd5plrnbpmh5fl5no@google.com CREATED:20090828T180403Z DESCRIPTION:Speaker Name: Emil Mottola\nSpeaker Institution : LANL\nTitle: The Trace Anomaly & Cosmological Horizon Fluctuations LAST-MODIFIED:20230127T203147Z LOCATION:4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravitation Theory Group Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221103T190000Z DTEND:20221103T200000Z DTSTAMP:20260828T094430Z UID:6u78uhr9nbhiue59un9018dupc@google.com CREATED:20221018T182658Z DESCRIPTION:Literature Seminar

      Speaker: Fathima-Zhulfaa Zhulficar

      Title: \;Emissive Platinum(II) Cages with Reverse Fluorescence Resonance Energy Tr ansfer for Multiple Sensing


      Abstract: \;https://chem.umd.edu/events/emissive-platinum ii-cages-reverse-fluorescence-resonance-energy-transfer-multiple-sensing LAST-MODIFIED:20221018T182658Z LOCATION:Institute for Physical Science and Technology\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090226T171500Z DTEND:20090226T181500Z DTSTAMP:20260828T094430Z UID:b4avrls1iivqpsmlpuua3ct7po@google.com CREATED:20090223T205629Z DESCRIPTION:Title: TEMPORAL INTERDEPENDENCIES BETWEEN COUPLED NEURONS IN CN S NETWORKS\nSpeaker: Rhonda Dzakpasu\, Georgetown University LAST-MODIFIED:20230127T203444Z LOCATION:Energy Research Building\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091118T180000Z DTEND:20091118T193000Z DTSTAMP:20260828T094430Z UID:aud3i2m8jr3di0t8l6qqhsaaio@google.com CLASS:PUBLIC CREATED:20091023T193158Z DESCRIPTION:Title: Multi-Hadron Systems in Lattice QCD\nSpeaker: William D etmold\nInstitution: College of William & Mary\, Williamsburg VA\n\nAbstra ct: Lattice QCD is a well-established tool for studying the low \nenergy dy namics of QCD. Precise results with fully controlled uncertainties \nare av ailable for many single hadron properties and lattice QCD has become \nan i ntegral part of modern particle physics. In the last few years the \nfirst realistic calculations in the two-hadron sector have also appeared \n(altho ugh not yet with the same level of systematic control of uncertainties\nas in the single-hadron case) stimulating the interest of the nuclear \nphysic s community as well. To become a central part of nuclear physics\, \nlattic e QCD must confront the many hadron systems that define nuclear \nphysics.\ n\nRecently\, the first steps have been taken in this direction by the NPLQ CD \ncollaboration who have performed a series of numerically studies of sy stems\nof up to twelve pions and/or kaons and up to three baryons. I will r eview \nthis work and outline the future prospects for lattice QCD in nucle ar \nphysics. LAST-MODIFIED:20230127T203505Z LOCATION:Physics\, Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111005T193000Z DTEND:20111005T210000Z DTSTAMP:20260828T094430Z UID:7u4lf1i1b4n24pfnel32bpegp0@google.com CREATED:20110718T181202Z DESCRIPTION:SPEAKER: Joaquin Drut\, Los Alamos National Lab\, NM\n\nTITLE: Life on the Lattice: From QCD to Cold Atoms\, Graphene and Beyond \n\nAB STRACT: Sophisticated algorithms and hardware advances\, recent and not-so -recent\, have propelled the field of lattice QCD (LQCD) to the forefront o f large-scale high-performance computing. Surprisingly\, some of the most p owerful LQCD methods remain virtually unknown in other areas of physics\, e ven where strong correlations are well known make paper-and-pencil approach es unreliable.\n\nIn this talk I will give a brief overview of some of the (by now) classical LQCD approaches to the many-body problem. I will mention some of the pitfalls on the way to adapting those methods to treat non-rel ativistic systems\, emphasizing recent successful applications to dilute ne utron matter\, cold atoms and graphene. Finally\, I will outline some of t he most interesting LQCD-motivated directions of current research\, a few o f which are directly applicable to a wide variety of problems in condensed matter as well as nuclear physics and astrophysics.\n\n LAST-MODIFIED:20230127T203625Z LOCATION:Physics Rm 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110509T150000 DTEND;TZID=America/New_York:20110509T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110509T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Exotic physics in unexpected places at the LHC"\n[Spea ker] Patrick Meade\n[Institution] SUNY\, Stonybrook\n LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121205T173000Z DTEND:20121205T183000Z DTSTAMP:20260828T094430Z UID:m8556j5m5g03gqhlc20cca5lgk@google.com CREATED:20121129T154123Z DESCRIPTION:Speaker: Michael C. Tringides\nIowa State University and Ames L aboratory USDOE\n \nTitle: STM studies of controlled metal growth on epitax ial graphene\n\nAbstract: STM is used to image the morphology of metals dep osited on large single and\nbilayer graphene domains on 6H-SiC(0001) as a f unction of temperature\, coverage\,\nand flux [1]\; the diffusion barrier\, the adsorption energy and the strength of the metal\ngraphene interaction are extracted. While there are several common features in the metal\ngraphe ne interaction\, others depend strongly on the specific metal\, as confirme d also in\nDFT calculations. Subsequent to work on Pb\, non-free-electron-l ike metals (rare earth\nGd\, Dy\, Eu and transition metal Fe) show metal-gr aphene bonds that are unusually\nstrong [2]\, but still much weaker than th e metal cohesive energy\, so that (except for Eu)\nthe islands are 3-d. For Fe on graphene the nucleated island density is unexpectedly\nhigh and temp erature independent\, in contrast to classical nucleation [3]. Kinetic Mont e\nCarlo simulations and DFT calculations can account for this behavior wit h long range\nrepulsive interactions. The ability to tune island density ca n be useful in magnetic storage\napplications. Dy islands show ideal triang ular instead of the hexagonal shapes expected\nfor hcp(0001)\; analysis sho ws that the Dy islands are fcc(111)\, not hcp\, with potential\nimplication s for the electronic and magnetic properties of the islands. Thermal anneal ing\nof the metal islands shows limited coarsening but increasing aspect ra tio (height/lateral\nsize)\, which can be useful for catalytic applications [4].\n\n1. M. Hupalo E.H. Conrad\, and M. C. Tringides\, Phys. Rev. B 80\, 041401R (2009).\n2. M. Hupalo et al. \, Advanced Materials 23\, 2082 (2011 )\n3. S. Binz et al.\, Phys. Rev. Lett. 109\, 026103 (2012)\n4. Xiaojie Liu et al.\, Phys. Rev. B 86\, 081414(R) (2012). LAST-MODIFIED:20230127T203851Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111031T203000Z DTEND:20111031T213000Z DTSTAMP:20260828T094430Z UID:b3fhrfo4s9ih97famgd38bfct4@google.com CREATED:20110908T195713Z DESCRIPTION:Title : A Common Origin of Galactic and Extragalactic Cosmic Ra ys\nSpeaker Name: Peter Biermann\nSpeaker Institution : Max-Planck-Institut e for Radioastronomy\, Bonn\, Germany\nNotes: Coffee\, Tea & Cookies 4:15-4 :30 PM\nAbstract : The origin of cosmic rays at all energies is still uncer tain. In this lecture we present and explore a model to produce cosmic rays with energy ranging up to $3 \\times 10^{20}$ eV. The model allows an expl anation of a variety of recent data: i) an upturn in the CR-positron fract ion (Pamela)\, ii) an upturn in the CR-electron spectrum (ATIC\, Fermi)\, i ii) a flat radio emission component near the Galactic Center (WMAP haze)\, iv) a corresponding IC component in gamma rays (Fermi haze and Fermi bubble )\, v) the 511 keV annihilation line also near the Galactic Center\, vi) an upturn in the CR-spectra of all elements from Helium\, with a hint of an u pturn for Hydrogen (CREAM)\,\nvii) a flat $\\gamma$-spectrum at the Galact ic Center (Fermi)\, and viii) the cosmic ray spectrum from KASCADE\, KASCAD E-Grande\, and Auger. We show here that just our Galaxy and the radio gala xy Cen A\, each with their own galactic cosmic ray particles\, but with tho se from the radio galaxy pushed up in energy by a relativistic shock in the jet emanating from the active black hole\, are able to describe the most r ecent data. \nContrary to widely held expectations\, no other extragalacti c source population is required to explain the data\, even at energies far below the general cutoff expected at $6 \\\, 10^{19}$ eV\, the Greisen-Zats epin-Kuzmin turn-off due to interaction with the cosmological microwave bac kground. We present several predictions for the detailed spectra\, the cos mic ray composition and the propagation to Earth which can be tested in the near future. LAST-MODIFIED:20230127T203110Z LOCATION:Location: Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110502T150000 DTEND;TZID=America/New_York:20110502T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110502T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] TBA\n[Speaker] Graham Kribs\n[Institution] University o f Oregon\n[Abstract] TBA LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:canceled-Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110506T150000Z DTEND:20110506T160000Z DTSTAMP:20260828T094430Z UID:ea7ijajlq7hpm8u1qh2rb60l4k@google.com CREATED:20110429T123226Z DESCRIPTION:Title: Manipulating system-bath correlations\nSpeaker: Prof. Ge rshon Kurikzi\,Weizmann Institute of Science\, Rehovot\, Israel\nAbstract:M anipulations of correlations among quantum systems so as to augment the cap abilities of computing and infor-mation processing have been a major focus research in the last decade. In this context manipulations of the dynamics so as to enhance the correlations between coupled quantum systems and overc ome their inhomogeneous broadening can be of both fundamental and applied i nterest. To this end we put forward methods based on repeated unitary phase -shifts (phase modulations) and nonunitary projections on the levels of a r eadout qubit coupled to a multipartite bath as a novel means of controlling the qubit-bath entanglement. The unitary phase-shifts rephase various quan tum interference pathways of the interacting qubit-bath system\, thereby av oiding the large inhomogeneities in the bath. By contrast\, repeated nonuni tary projections momentarily erase the coherences between the coupled syste ms and subsequently recreate [1\, 2] them with larger amplitude. The advant age of this method is that the coupled qubit-bath system reaches a steady s tate where the information is stored for long times [3].\nIn order to optim ize the process we have put forward a general strategy for dynamic control that ensures bath optimized fidelity of a desired multidimensional quantum operation in the presence of any baths and noises. It benefits from the vas t freedom of arbitrary\, not just pulsed\, timedependent control. This allo ws the dramatic reduction of the invested energy and the corresponding erro r compared to pulsed control [4]. As a first novel application of such gene ral\, dynamic control of coupled many-body quantum systems\, we address a B ose-Einstein Condensate in a doublewell potential. Our theory and experimen t provide a means of dynamically controlling decoherence in such systems [5 \, 6].\nThe second application of our method is the manipulation of the col lective dynamics of spin ensembles that encode a single qubit. Since an ens emble of spins have long coherence times\, they can be used as quantum memo ry. To transfer and retrieve quantum information with high fidelity\, we ne ed a perfect quantum talk with the device to which it is coupled\, for exam ple a cavity or a superconducting device. Yet the large inhomogeneity in th e coupling strengths and the inherent inhomogeneous broadening present in t he ensemble of spins impede such quantum talks. To unmask the effects of in homogeneities so as to perform perfect quantum operations between the syste ms one needs an optimized control. The standard spin echo techniques\, thou gh proven to be quite successful in correcting the inhomogeneous broadening in certain spin systems\, may not suffice. Here we show a nonintuitive met hod for transferring and retrieving information with high fidelity\, by con trolling the qubit to which the spin ensemble is coupled. Such a control is much easier than controlling 106 spins in the ensemble by spin echo techni que. For finite systems such a method can be used to maximally entangle the qubit with the state of an nhomogeneously broadened spin ensemble\, a task impossible using other methods.\nWe present experimental evidence [2]\, th at the interaction of a qubit with a finite bath of spins can be controlled by coherence destroying random fields that mimic nonunitary projections. B y doing such operations one may steer the qubit ensemble towards a desired quasi-equilibrium corresponding to either cooling or heating (increase or d ecrease in initial purity)\, by choosing suitable time intervals between no nunitary projections (quantum easurements). These operations repeatedly de stroy the qubit-bath correlations (coherences). The counterrotating terms w hich are usually neglected in the long time limit\, can be important at all times under such measurements. This is a first demonstration\nboth theoret ically and experimentally\, of how the counterrotating terms can determine the long-time saturation value of the qubit state. The experiments were per formed using a liquidstate NMR simulator. The system (S) a spin 1/2 nuclear spin of carbon 13C\, and the bath was composed of protons. The nonunitary projective measurements on the system are\nrealized by the use of pulsed ma gnetic field gradients with random energies. Application of such repeated p rojective measurement eventually takes the total system towards a true stea dy state\, where the total system commutes with the interaction Hamiltonian . Deviations from such a state depend on the relative magnitudes of the rot ating and counter-rotating terms. LAST-MODIFIED:20230127T203103Z LOCATION:CSS 2115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220923T160000Z DTEND:20220923T170000Z DTSTAMP:20260828T094430Z UID:56ksa9jfpvlf7k8tma3qqc98fn@google.com CREATED:20220918T010603Z DESCRIPTION:Title: Topological gauge theory for mixed Dirac stationary sta tes in all dimensions\nSpeaker: Zemin Huang (JQI)\nTime: Friday\, Septemb er 23\, 2022 - 12:00pm\nLocation: ATL 2324\n\nTopological mixed quantum st ates in or out of equilibrium can arise in open quantum systems. Their line ar responses are generally non-quantized\, even though quantized topologica l invariants can be defined. In this talk\, I will present a real-time U(1) topological gauge field action capable of reconciling this paradoxical phe nomenology. In addition to non-quantized linear responses\, this action enc odes quantized non-linear responses associated with mixed state topology. A lso\, this construction demonstrates how the physical pictures of anomaly i nflow and bulk-boundary correspondence extend to non-equilibrium systems.\n \n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220918T010603Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Zemin Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110404T163000Z DTEND:20110404T173000Z DTSTAMP:20260828T094430Z UID:r6mr6vel7qvnn30ppbqle3ppbg@google.com CREATED:20110329T172232Z DESCRIPTION:TITLE: Optomechanics with Sub-wavelength Gratings and Quantum D ots\nSPEAKER: John Lawall\nINSTITUTION: NIST\nABSTRACT: I will describe t wo experiments underway with the goal of laser-cooling a fabricated mechani cal oscillator toward the quantum ground state. In a first experiment\, we fabricate a sub-wavelength grating structure in a silicon nitride membrane to create a mechanically compliant\, highly reflective mirror\, with a very high mechanical quality factor. We then use this grating as one mirror of a Fabry-Perot cavity\, where radiation pressure couples the optical and mec hanical degrees of freedom. I will discuss the optomechanical properties of these devices\, including the prospects for ground-state cooling. In a sec ond experiment\, self-assembled quantum dots are used to read out mechanica l motion by means of resolved sidebands in the fluorescence spectrum. This system is a solid-state analog of a trapped ion\, in which the motional cou pling to the optical field is provided by the strain-dependence of the defo rmation potential.\n LAST-MODIFIED:20230127T203602Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120222T191500Z DTEND:20120222T201500Z DTSTAMP:20260828T094430Z UID:4lva6csv12dbpobs0rvt0mmvd0@google.com CREATED:20120206T190852Z DESCRIPTION:SPEAKER: William Detmold\, College of William & Mary\, William sburg VA\nTITLE: Ab Initio Nuclear Physics\n ABSTRACT: At its core\, nucle ar physics\, which describes the properties and interactions of hadrons\, s uch as protons and neutrons\, and atomic nuclei\, arises from the Standard Model. However\, the complexity of nuclear physics produces severe computat ional difficulties that presently frustrate the ab initio calculation of ce ntral quantities such as nuclear spectra and nuclear matrix elements. I wi ll discuss recent progress in QCD calculations for light nuclei and other m ulti-hadron systems. \n \n LAST-MODIFIED:20230127T203331Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221122T160000 DTEND;TZID=America/New_York:20221122T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221122T160000 CREATED:20210423T130624Z LAST-MODIFIED:20221115T142715Z SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics colloquium cancelled\; Happy Thanksgiving! TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100326T180000Z DTEND:20100326T190000Z DTSTAMP:20260828T094430Z UID:64t53jpqru99nvj1fhd83sn7dk@google.com CREATED:20100323T165814Z DESCRIPTION:Title: "Nonlinear Magnetization Dynamics in Nanostructures"\nSp eaker: Prof. Isaak Mayergoyz\nAlford L. Ward Professor\, Department of Elec trical and Computer Engineering\, University of Maryland \nABSTRACT:\nThe talk will deal with the analytical study of magnetization dynamics governed by the Landau-Lifshitz equation and its generalization to the case of spin -polarized current injection. The main focus will be on "large angle magnet ization motions" when the nonlinear nature of the Landau-Lifshitz equation is strongly pronounced. Such applications as "damping"\, "precessional" and "microwave-assisted" modes of switching of magnetization in magnetic data storage devices will be highlighted. Analysis of microwave generation induc ed in nanostructures by spin-polarized current injection will be outlined. The issues related to randomly perturbed magnetization dynamics\, calculati on of spectral (power) density by using the machinery of stochastic process es on graphs and spin-wave instability in spatially confined nanostrucures will be discussed as well. \n LAST-MODIFIED:20230127T203148Z LOCATION:Jeong Kim Engineering Building\, Rm. 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Booz Allen Hamilton Distinguished Colloquium in Electrical and Computer Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091112T190000Z DTEND:20091112T203000Z DTSTAMP:20260828T094430Z UID:qdp7d02m5g5jaf499baooehh08@google.com CREATED:20091106T154506Z DESCRIPTION:[Title] Electric field induced spin precession in a spin\ninjec ted FET\n[Speaker] Mark Johnson\n[Institution] Naval Research Laboratory\n[ Abstract] Successful fabrication of a Spin Injected Field Effect Transistor (Spin FET)\nhas been an elusive goal since the device was first proposed b y Datta and\nDas two decades ago. We recently demonstrated a spin FET compr ising a\nhigh mobility InAs heterostructure with ferromagnetic metal electr odes for\nthe electrical injection and detection of ballistic spin polarize d electrons.\nThe modulation of spin precession by using a gate voltage is a unique\nmanifestation of an effect of special relativity. For those who w ish to\nconsider spin as a state variable for future generation electronics \, the\nexperiment shows that spin can be controlled by the same parameter\ n(voltage) that's used to control the charge state.\nH. C. Koo et al.\, Sci ence 325\, 1515 (Sept. 18\, 2009)\n[Host] Ian Appelbaum LAST-MODIFIED:20230127T203834Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110518T191500Z DTEND:20110518T201500Z DTSTAMP:20260828T094430Z UID:dtda7ri883c8pdh45kfm4shuh0@google.com CREATED:20110422T184149Z DESCRIPTION:Speaker: Jennifer Seiler\, Goddard Space Flight Center\, NASA. \nTitle: "Binary Orbital Dynamics from Analysis of Spherical Harmonic Modes of Gravitational Waves"\nAbstract: I will present an analysis of the prope rties of binary black hole inspirals obtainable from the spherical harmonic modes of the emitted gravitational waveforms. Using well-know methods we e xtract the final spins\, kicks\, and mass of the merged black holes. By the energy loss from the waves we can estimate the rate of inspiral\, and from the asymmetric spherical harmonic modes we can obtain the orbital frequenc y. Then\, using Wigner rotation to find the angles that minimize the asymme tric spherical harmonic modes we can obtain the angles of the\nprecession o f the system. Effectively we are finding rotation angles that would make th e line from the observer to the system always line up with the orbital angu lar momentum. Thus we show that most of the astrophysical qualities and dyn amics from precessing binary black hole systems can be reconstructed from o bserved waveforms.\n LAST-MODIFIED:20230127T203348Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091020T200000Z DTEND:20091020T210000Z DTSTAMP:20260828T094430Z UID:v0rpr0fd1ateruodjf9lahvdb8@google.com CREATED:20090421T192632Z DESCRIPTION:Pioneering theorist and Nobel laureate Philip W. Anderson has b een named the first recipient of the Richard E. Prange Prize and Lectureshi p in Condensed Matter Theory and Related Areas. Anderson will receive a $10 \,000 honorarium and deliver a public presentation at the University of Mar yland\, College Park on Oct. 20\, 2009.\n\nThe annual award\, newly establi shed by the UMD Department of Physics and Condensed Matter Theory Center (C MTC)\, honors the late Professor Richard Prange\, whose distinguished caree r at Maryland spanned four decades (1961-2000). The Prange Prize is made po ssible by a gift from Dr. Prange's wife\, Dr. Madeleine Joullie of the Univ ersity of Pennsylvania.\n\nAnderson\, currently Joseph Henry Professor of P hysics at Princeton University\, made indispensable contributions to what i s known about the behavior of charges in different sorts of "solid state" s ystems such as those employed in transistors and other electronic devices. He was awarded the Nobel Prize in 1977 for "fundamental theoretical investi gations of the electronic structure of magnetic and disordered systems." In 1982 he received the National Medal of Science from President Ronald Reaga n for "fundamental and comprehensive contributions to the theoretical under standing of condensed matter."\n\nAnderson's lecture\, titled "Presenting U npopular Theories\," will be delivered at the University of Maryland's John Toll Physics Building at 4:00 p.m. EDT on Tuesday\, Oct. 20 in the Physics Lecture Hall\, Room 1412. The event is open to the public.\n\nDr. Richard Prange did his graduate studies at the University of Chicago\, where he wor ked with Nobelist Yoichiro Nambu\, among others. Prange was the editor of a widely known book on the quantum Hall effect\, but his interests reached w ell beyond condensed matter\, extending into every substantive aspect of th eoretical physics including seminal work on quantum chaos. He was at comple te ease discussing subjects as disparate as ferromagnetism and the cosmolog ical constant. His interests also included history and travel.\n\nAt the Un iversity of Maryland\, he played a vital role in the life of the Physics De partment\, leading a substantial reform of its undergraduate major program and serving as chair of crucial departmental committees.\n\n"Richard enjoye d a fascinating and fulfilling career at the University of Maryland explori ng condensed matter physics\, and even after retirement was active in the d epartment\," said Dr. Joullie. "He spent the very last afternoon of his lif e in the lecture hall for a colloquium on graphene\, followed by a vigorous discussion. And so I am happy to institute the Prange Prize\, which will c ertainly generate its own robust discussions in condensed matter theory. Ph illip Anderson is the ideal inaugural honoree."\n\nDr. Prange was a member of the Maryland condensed matter theory group for more than 40 years and wa s an affiliate of CMTC since its inception in 2002.\n\n"The Prange Prize pr ovides a unique opportunity to acknowledge transformative work in condensed -matter theory\, a field that has proven to be an inexhaustible source of i nsights and discoveries in both fundamental and applied physics\, said Dr. Sankar Das Sarma\, a UMD Distinguished University Professor and director of the CMTC. "Much of that progress was made possible by the pioneering scien ce of Philip Anderson\, who had a profound influence on subjects ranging fr om the electronic structure of disordered materials to superconductivity an d elementary particle physics."\n\n LAST-MODIFIED:20230127T203805Z LOCATION:PHYS 1412 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Prange Prize--Philip W. Anderson TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100212T183000Z DTEND:20100212T193000Z DTSTAMP:20260828T094430Z UID:o5s6o5vb8jiid9q6kv7j7uh93c@google.com CREATED:20100202T193024Z DESCRIPTION:[Speaker] Michele Levi\n[Institution] Racah Institute\, Hebrew University\n[Title] "Post-Newtonian corrections from effective field theory approach"\n[Abstract] The effective field theory approach to the post-Newt onian formalism of general relativity will be introduced. I will review the main ideas of effective field theory\, and demonstrate how the effective a ction is constructed for each scale in the problem of a binary system. I wi ll then consider basic examples for the use of the EFT approach. Recent app lications will be reviewed\, from such that do not involve the PN approxima tion\, to self-gravitating spinning objects in compact binaries - the focus of my recent works. LAST-MODIFIED:20230127T203540Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100917T170000Z DTEND:20100917T180000Z DTSTAMP:20260828T094430Z UID:uhhjlfgoa5foagqrtmju9pt5v8@google.com CREATED:20100910T132853Z DESCRIPTION:Title: Dynamic Self-Assembly of Biomacromolecules Probed Using Optical Tweezers\nSpeaker: Joonil Seog Assistant Professor\, Joint\, Depart ment of Materials Science and Engineering and Fischell Department of Bioeng ineering\nUniversity of Maryland\nAbstract: Single molecule studies have ma de huge impact on our understanding of how biomolecules interact each other . The capability of monitoring one molecule at a time reveals not only the averaged properties from bulk ensemble measurements but also entire distrib ution of relevant properties with subpopulations and infrequent events. The time evolution of individual molecular behavior also provided the mechanis tic insights of the biological events\, which cannot be observed in ensembl e experiments. Using optical tweezers\, unfolding and refolding process of cell adhesion molecule was studied at the single molecule level. The molecu le exhibited stepwise multiple transitions in a specific order during unfol ding processes\, showing mechanical hierarchy in a single protein domain. I n the force clamping experiment\, three intermediate states were observed w hen the molecule hops between unfolded state and refolded state. The strong correlation between folding behavior and protein dynamics in allosteric re gulation was revealed. The optical tweezers is also applied to understand t he unpackaging process of DNA: cationic polymer complex which is critical s tep in gene delivery. During extension/relaxation cycles\, the mechanical d econdensation and recondensation of DNA: cationic polymer complex showed si gnificant dependency on the pH level. The relationship between transfection efficiency and mechanical behaviors of the condensed complex is establishe d to provide molecular design parameters for enhanced gene delivery carrier . \n LAST-MODIFIED:20230127T203522Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221025T150000Z DTEND:20221025T154500Z DTSTAMP:20260828T094430Z UID:4crr40i5ndkkm8b8p5jlo3ggm2@google.com CREATED:20220815T164940Z DESCRIPTION:Speaker: Dr. Mei Hong\, Massachusetts Institute of T echnology

      Title: Structure &\; Dynamics of Channels and Transport ers from Solid-State NMR


      Abstract: \;Enveloped viruses and bacteri a encode membrane-bound ion channels and transporters that are important fo r the survival and infectivity of these pathogens. Elucidating the structur e\, dynamics and mechanism of action of these membrane proteins is importan t for advancing fundamental knowledge of channels and transporters and for developing antiviral and antibiotic drugs. In this lecture I will present o ur recent determination of the structures and dynamics of the influenza B v irus M2 proton channel\, the SARS-CoV-2 E cation channel\, and the bacteria l transporter EmrE. Using multidimensional solid-state NMR spectroscopy and F-based long-range distance measurements\, we have determined atomic-resol ution structures of these three membrane proteins in phospholipid bilayers. For BM2\, the closed and open channel structures explained the proton cond uction direction of this channel. Measurement of water H chemical shift ani sotropies further showed that water in the channel is anisotropic\, suggest ing a mechanism with which water mediates proton hopping in the channel por e. The structure of the SARS-CoV-2 E protein shows a triple phenylalanine m otif that may be responsible for regulating channel opening. We investigate d the structure of substrate-bound EmrE using a novel H-F distance techniqu e. By measuring hundreds of distances between protein amide protons and the fluorinated substrate at neutral and acidic pH\, we solved the structures of this canonical bacterial transporter in both its outward-facing and inwa rd-facing states. The two structures provide unprecedented insights into ho w EmrE uses alternating access to carry out membrane transport.

      LAST-MODIFIED:20221017T134600Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100303T200000Z DTEND:20100303T210000Z DTSTAMP:20260828T094430Z UID:hkt1haj4q4nkm6hgbhgc7dou30@google.com CREATED:20100225T135130Z DESCRIPTION:Title: High spectral efficiency optical communications: Experim ental status and fundamental limits\n \nBy: Dr. Peter J. Winzer & Dr. Ren-J ean Essiambre\n Bell Labs\n \nAbstract:\nOver the past 20 years\, the e xponentially growing traffic demand in data networks has been satisfied by the high scalability of wavelength-division multiplexed (WDM) fiber-optic c ommunication systems\, with per-fiber capacities of 32 Tb/s demonstrated in research labs. Up until the early 2000s\, the underlying increase in spect ral efficiency was due to stability and speed advances in optical and opto- electronic hardware components\, allowing for an increasingly denser packin g of simple on-off keyed WDM channels. However\, with today's technological ability to pack WDM channels so dense that their modulation spectra start overlapping\, increasing the spectral efficiency is asking for richer symbo l constellations and polarization multiplexing\, bringing about the need fo r coherent detection. We will review the state of research in high spectral efficiency optical communication systems in the light of these dramatic ch anges in optical communication technologies. We will then address the quest ion as to whether there exist fundamental limits to the capacity that can b e sent over a single optical fiber. Extending Shannons information theory t o the presence of the instantaneous Kerr nonlinearity in optical fibers\, w e arrive at fundamental capacity limit estimates. A comparison of these lim its with today's experimentally achievable spectral efficiencies reveals si gnificant WDM scalability challenges that need to be addressed in order to guarantee sustained bandwidth growth for rich data services well into the f uture. LAST-MODIFIED:20230127T203008Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College P ark\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100202T160000 DTEND;TZID=America/New_York:20100202T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100202T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Tony Heinz\, Columbia University\nTitle: "Seeing electrons in one and two dimensions: optics of carbon\nnanotubes and graph ene"\nAbstract: Two of the most fascinating nanoscale materials to have eme rged in\npast several years are based on the sp2-hybridized layers of carbo n:\nThe one-dimensional system of carbon nanotubes and the two-dimensional\ nsystem of graphene. We will discuss the distinctive properties of\nelectr ons and their interactions in these model lowered-dimensional\nmaterials. E mphasis will be given to recent advances in the use of\noptical spectroscop y. These methods now allow us to directly access\nindividual nanostructure s and to probe how they are influenced by the\nenvironment. They also provi de us with a unique window into the\nunderlying dynamics of electrons and p honons through application of\nfemtosecond spectroscopic techniques. LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T203000Z DTEND:20221116T213000Z DTSTAMP:20260828T094430Z UID:501kroqts3qoeftifsrq82n6k6@google.com CREATED:20221104T175647Z DESCRIPTION:

      Titl e : Toward a trans-disciplinary framework for tracing cosmic energy flow

      Speaker Name: Jaye Verniero

      Speaker Institution : Goddard Spa ce Flight Center

      Abstract : Heliophysics is inherently interdiscipl inary\, connecting multiple sub-disciplines within the space sciences\, to achieve an enhanced understanding of the way the Sun influences its surroun ding space-environment. The uniting theme is energy transfer: how is it gen erated and where does it go? The subject of kinetic-scale wave-particle int eractions is often studied independently from macroscale contexts. In this talk\, we first approach the problem within the framework of turbulent ene rgy dissipation mechanisms. We overview what we have learned about the natu re of energy transfer in the inner heliosphere as seen by Parker Solar Prob e's initial orbits around the Sun. Specifically\, we present observations o f asymmetric particle velocity distribution functions synchronous with elec tromagnetic fields measurements. We conclude with a discussion of generaliz ing the language of energy dynamics within the framework of mathematics\, w orking toward a trans-disciplinary approach to heliophysics.



      swisdak@umd. edu \;

      LAST-MODIFIED:20221104T175739Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120514T200000Z DTEND:20120514T210000Z DTSTAMP:20260828T094430Z UID:qu75omo2kadikdvtkffk9ck9mo@google.com CREATED:20120507T152247Z DESCRIPTION:Title : New 3D Imaging Technologies for Cells and Embryos\nSpea ker Name: Hari Shroff\nSpeaker Institution : National Institutes of Health\ nNotes: *Refreshments at 3:45pm\n LAST-MODIFIED:20230127T203451Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110224T160000Z DTEND:20110224T170000Z DTSTAMP:20260828T094430Z UID:mit8av2iuu7jpvpv3rikiso154@google.com CREATED:20110216T140732Z DESCRIPTION:Special Joint BioE/ChBE Seminar: Jeanne Stachowiak LAST-MODIFIED:20230127T203108Z LOCATION:1105 Jeong H Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint BioE/ChBE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220922T180000Z DTEND:20220922T193000Z DTSTAMP:20260828T094430Z UID:36cbamu2csru0hltce1eeh0avq@google.com CREATED:20220922T135257Z DESCRIPTION:
      Speaker: \;Maxim Mai\, Bonn

      Title: Re sonant 3-body systems in and outside of a box       LAST-MODIFIED:20220922T135257Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221205T213000Z DTEND:20221205T223000Z DTSTAMP:20260828T094430Z UID:502njggu9i4bc8vllj2vpr32cg@google.com CREATED:20221114T170054Z DESCRIPTION:Title: \;Measuring planetary surface composit ion with gamma rays and neutrons

      Speaker: \; Mauricio Ayllon Unzueta\, \;NASA Goddard Space Flight Cent er

      Abstract: \;Gamma-ray and neutron spectrometers have been used to map the bulk surface elemental composition of planetary objects since the beginning of the era of space ex ploration. They have played an important role in detecting and then charact erizing water ice deposits on our Moon’s permanently shadowed regions\, as well as mapping for the first time the elemental distributions across its s urface. There are several upcoming missions with both orbital and in-situ n uclear spectrometers such as Dragonfly\, Psyche\, and MMX. In this seminar\ , I will give an overview of the principles and characteristics of nuclear spectrometers with a focus on the Dr agonfly mission to explore Saturn’s moon Titan and the current work bei ng done at NASA Goddard Space Flight Center.

      Talk Recording

      Notes: Join the meeting at 4:15 for meet and greet.  \;
      Visit https://bit.ly/2PmJoT6 to be added to the email list.
      LAST-MODIFIED:20221214T162833Z LOCATION:online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111108T181500Z DTEND:20111108T191500Z DTSTAMP:20260828T094430Z UID:o7a8hi2bs35npij6n5j95el40g@google.com CREATED:20111026T201619Z DESCRIPTION:Title: Terahertz Spectroscopic Technologies at NIST: Research D evelopments and New Applications\nSpeaker: Dr. Edwin J. Heilweil\, Physical Measurement Laboratory\, NIST LAST-MODIFIED:20230127T203733Z LOCATION: Room 1207\, Energy Research Facility SEQUENCE:2 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091019T200000Z DTEND:20091019T213000Z DTSTAMP:20260828T094430Z UID:fupt3eapuo4ci0ei65ml5k2kco@google.com CREATED:20091008T154558Z DESCRIPTION:Title : Role of Promiscuous Binding and Intrinsic Disorder in P rotein Interactions.\nSpeaker Name: Anna Panchenko\nSpeaker Institution : N ational Institutes of Health\nNotes: Refreshments served at 3:45PM\n\n LAST-MODIFIED:20230127T203312Z LOCATION:1116 IPST Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090924T180000Z DTEND:20090924T193000Z DTSTAMP:20260828T094430Z UID:su6nmuibhij57k7vk02qdr6ito@google.com CREATED:20090921T132618Z DESCRIPTION:Title : The Problem(s) of Very Low Temperature Noise in Superco nducting Circuits\nSpeaker Name: Professors Lev Ioffe and Lara Faoro\, Rutg ers University\nNotes: The refreshment will be served from 1:30pm to 2pm.\n Abstract : We review the data on flux noise in superconducting circuits and \nformulate an appropriate theoretical model that involves spins coupled\nb y RKKY interaction. We show that for the solution of this model one\nneeds a new technique to compute the high frequency asymptotics of\nthe spin corr elators in weakly interacting disordered spin systems. We\ndevelop this tec hnique and apply the results to the problem of flux\nnoise. We show that th e fast decay of spin correlators at high\nfrequencies translates into the 1 /f behavior of the low frequency noise\ngenerated by rare strongly coupled spins.\nIn the second part of the talk we consider the general question of the\nnoise generated by strongly disordered spin systems and quantum\ntrans itions driven by the competition of the disorder and spin-spin\ninteraction . We solve the prototypical model that describes such\ntransitions on the B ethe lattice and show the existence not of two but\nthree possible phases. Namely\, large spin interactions lead to a\ncomplete delocalization of the spin excitations\, these excitations\nbecome very slow at low temperatures in the intermediate phase and\ncompletely freeze in the strongly disordered phase. LAST-MODIFIED:20230127T203508Z LOCATION:PHYS 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120305T173000Z DTEND:20120305T183000Z DTSTAMP:20260828T094430Z UID:ebrupurfhq0f93giju1scp853k@google.com CREATED:20120301T140556Z DESCRIPTION:Title: Atomic clocks and the search for variation of fundamenta l constants\nSpeaker: Marianna Safronova\, University of Delaware\nAbstract : Recent advances in atomic and optical physics have led to unprecedented i mprovements in the optical frequency metrology leading to more sensitive qu antum-based standards for various applications including search for variati on of fundamental constants. The modern theories directed toward unifying g ravitation with the three other fundamental interactions suggest variation of the fundamental constants in an expanding universe. Some atomic systems exhibit much higher sensitivity to the variation of fine-structure constant a allowing more precise tests of the temporal a-variation and possible tes ts of the spatial variation. I will review the present status of the labora tory and astrophysical searches for variation of the fundamental constants\ , and outline the proposals for future developments of optical frequency st andards needed for the next generation of such tests. \nFurther improvement of the optical frequency standards requires understanding of the effect of the blackbody radiation (BBR) shift on the transition frequency. I will re port the development of a new method of first-principles calculation that r educed the relative uncertainty due to the BBR shift at 300K in Al+ to 4×10 -19 as well as significantly improved knowledge of BBR shift in other syste ms. The same methodology can be used for better understanding of alkaline-e arth and other more complicated atoms such as Ho of present interest to qua ntum information. \n\n LAST-MODIFIED:20230127T203346Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar -Marianna Safrono TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101013T223000Z DTEND:20101014T000000Z DTSTAMP:20260828T094430Z UID:tl2np9fnq5tpgenncsgqi07d2k@google.com CREATED:20101007T185046Z DESCRIPTION:Title: PAKISTAN AND INDIA UNDER THE NUCLEAR SHADOW \nAbstract: In May 1998\, over a billion people were thrust into the nuclear shadow whe n India and Pakistan blasted their way onto the world stage as nuclear weap ons states. What is the situation today? Did nuclear weapons bring peace th rough mutual deterrence? Or do risks of nuclear war and nuclear terrorism o utweigh all else? The lecture will include a path-breaking 35 minute indepe ndent documentary made in Pakistan by the speaker\, who will take a critica l look at what the bomb has done for the two countries. Senior Indian and P akistani military leaders assess the consequences of nuclear testing in Sou th Asia and the possibility of war. Heads of Islamic religious organization s and militant groups engaged in jihad explain the hopes they have for the bomb and why they believe it strengthens Pakistan and Islam. Leading peace activists\, academics and journalists make the case that nuclear South Asia is spiralling into instability\, an arms race\, deepening poverty\, and an ever-greater threat of nuclear war\, both deliberate and accidental. \n\nP ROFILE: \nSpeaker: Pervez Amirali Hoodbhoy is professor of nuclear and high energy physics at the department of physics\, Quaid-e-Azam University\, Is lamabad. He received his BS\, MS\, and Ph.D degrees from the Massachussetts Institute of Technology. Dr. Hoodbhoy was awarded the Baker Award for Elec tronics and the Abdus Salam Prize for Mathematics. He is the author of "Isl am and Science - Religious Orthodoxy and the Battle for Rationality"\, now in 7 languages. In 2003 he was awarded UNESCO's Kalinga Prize for the popul arization of science. Also in 2003\, Dr. Hoodbhoy was invited to the Pugwas h Council. He is a sponsor of The Bulletin of the Atomic Scientists\, and r eceived the Joseph A. Burton Award from the American Physical Society in 20 10. \n LAST-MODIFIED:20230127T203124Z LOCATION:The George Washington University Lindner Family Commons 1957 E Str eet NW\, Room 602 Washington\, DC SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The George Washington University Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081119T203000Z DTEND:20081119T213000Z DTSTAMP:20260828T094430Z UID:o6og3ohsgudkqnsrgsftgldmec@google.com CREATED:20081114T202456Z DESCRIPTION:Title: Thinking and learning close to the sensory-motor surface creates knowledge that transcends the here-and-now\nSpeaker: Linda SmithIn diana University\n LAST-MODIFIED:20230127T203649Z LOCATION:Physics 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Education Research Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091012T203000Z DTEND:20091012T213000Z DTSTAMP:20260828T094430Z UID:f66bo89pe3qcvnvdrtre71l4p4@google.com CREATED:20091014T202409Z DESCRIPTION:Title : What Is Solar Minimum and Why Should We Care?\nSpeaker Name: Dean Pesnell\nSpeaker Institution : Goddard Sapce Flight Center (GSFC )\nAbstract : The study of solar minimum has been a poor cousin to solar ma ximum due to the large variations seen in the Sun during maximum. Solar act ivity is low or absent during solar minimum and all of the phenomena that f ollow the sunspot number are also smaller in frequency and strength. Even t he definition of solar minimum is difficult because the main indicator of s olar activity is zero for an extended period of time. But the Sun presents a different face at minimum. The magnetic field is weaker but far more symm etric\, almost a dipole for the few minimum that have been measured. A simi lar behavior is seen in the corona measured by coronagraphs and magnetic fi elds measured in the heliosphere. Particle fluxes in the solar wind are sma ller. As a result the scattering of galactic cosmic rays is reduced and a l arger flux of GCRs is be seen at Earth. The current solar minimum has been extreme in having weaker surface fields than previous measurements\, few sp ots for longer than!\n average\, and an interesting signature in Earth¹s ma gnetic field. We shall discuss these magnetic signatures and the implicatio ns for Space Weather and climate of a time with weak solar activity.\n LAST-MODIFIED:20230127T203601Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cosmic Ray Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081118T211500Z DTEND:20081118T221500Z DTSTAMP:20260828T094430Z UID:03rhge6ogtsi94irlcicrjgs9k@google.com CREATED:20080915T191541Z DESCRIPTION:Speaker:Diandra Leslie-Pelecky\, University of Texas at Dallas\ nTitle:"The Physics of NASCAR: Science at 200 mph"\n LAST-MODIFIED:20230127T203320Z LOCATION:Physics Building\, Room: 1410 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium *Special Time* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221006T180000Z DTEND:20221006T190000Z DTSTAMP:20260828T094430Z UID:758aql6nuchia5svhf94rap3le@google.com CREATED:20221003T173333Z DESCRIPTION:
      Speaker: Ismail Zahed\, Stony Brook University
      Title: Hadron mass\, spin and light front wavefunctions from the inst anton liquid model

      Abstract: TBA       LAST-MODIFIED:20221003T173333Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091118T203000Z DTEND:20091118T213000Z DTSTAMP:20260828T094430Z UID:58uckievptipfsvs73vdoicdbs@google.com CREATED:20091111T183353Z DESCRIPTION:Title: Autonomous Systems\nBy: Prof. Gil Blankenship\nDepartmen t of Electrical and Computer Engineering\nUniversity of Maryland\n\nAbstrac t:\nIn this talk we will examine some of the issues associated with mobile autonomous systems functioning in networks to solve specific types of probl ems such as search and rescue or surveillance. Both distributed and central ized architectures will be examined. We will present a summary of the coope rative SLAM problem together with software and hardware architectures to so lve distributed applications. We will also discuss our experiences using ro botic systems in cooperative and competitive games. Finally\, we will discu ss the development of a software system for the control of mobile robotics with multiple sensor systems and wireless network communications. \n LAST-MODIFIED:20230127T203832Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Green mead Dr.\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131118T160000Z DTEND:20131118T173000Z DTSTAMP:20260828T094430Z UID:9spr7f6irj2vnmspic8lahn8sg@google.com CLASS:PUBLIC CREATED:20130823T174659Z DESCRIPTION:Institution:University of Pittsburg \n\nTitle: Dissipative dyna mics\, heating\, and thermalisation of cold atoms in optical lattices \n\nA bstract:\nOne of the key challenges in current experiments with cold atoms in optical lattices is the realization of lower temperatures required for t he preparation of many interesting quantum phases. In this context\, it is very important to be able to characterise and control the competing heating processes. These include\, for example\, spontaneous emissions from incohe rent scattering of the lattice light. Such heating processes give rise to d ecoherence of many-body states\, and the resulting dynamics can be highly s ensitive to the form of the state. Moreover\, there is often a separation o f timescales between some excitations that thermalize rapidly\, and others that do not properly thermalize in the duration of an experimental run. Thi s can strongly modify\, and even reduce the overall effects of the heating processes. \n \nI will discuss some of our recent work in this direction\, where we explore the relaxation of a system of bosons in an optical lattice in 1D after decoherence due to spontaneous emission events. For simple obs ervables\, we find regimes in which the system relaxes rapidly to values in agreement with a thermal distribution\, and others where thermalization do es not occur on typical experimental timescales. Because spontaneous emissi ons lead effectively to a local quantum quench\, this behaviour is strongly dependent on the low-energy spectrum of the Hamiltonian\, and undergoes a qualitative change at the Mott Insulator-superfluid transition point. These results have important implications for the understanding of thermalizatio n after localized quenches in isolated quantum gases\, as well as the chara cterization of heating in experiments. I will also briefly discuss the heat ing of two-species fermions in spin-ordered states due to spontaneous emiss ion events.\n LAST-MODIFIED:20230127T203827Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Andrew Daley TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120411T181500Z DTEND:20120411T191500Z DTSTAMP:20260828T094430Z UID:6cgmqpn749q88031id6lu8lmjg@google.com CREATED:20120216T191907Z DESCRIPTION:SPEAKER: Thomas DeGrand\, Univ of Colorado @ Boulder\nTITLE: Checking Technicolor Candidates Using the Lattice\nABSTRACT: I summarize a program of lattice simulations of gauge theories coupled to symmetric rep resentation fermions. The original motivation for studying them was that t hey might be candidates for strongly-coupled beyond Standard Model physics . The approach of my colleagues (B. Svetitsky and Y. Shamir) and me was to measure a running coupling constant and mass anomalous dimension using la ttice background field methods. These theories turned out not to be phenome nologically viable. However\, along the way we (re-)learned a lot about co nformal or nearly conformal theories and how they appear in lattice simul ations\, and this might make an interesting story. LAST-MODIFIED:20230127T203535Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131107T183000Z DTEND:20131107T190000Z DTSTAMP:20260828T094430Z UID:4hgbh21igjkl41b6eqjk30j1mc@google.com CREATED:20131024T151632Z LAST-MODIFIED:20230127T203529Z LOCATION:Physics room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120504T233000Z DTEND:20120505T003000Z DTSTAMP:20260828T094430Z UID:n3djigrq2c2edi1n3rdb2fe24k@google.com CREATED:20110818T204056Z DESCRIPTION:A collection of our best demonstrations\, including the mysteri ous psychoacoustic vibration transducer\, the lovely laser waterfall\, and the infamous “eight ways to smash a can.” Vote for your favorite! \n\nDoors open 7:00PM\nFor directions and further information call 301-405-6045 or v isit www.physics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T203335Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Greatest hits of Physics Demonstration TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100429T140000 DTEND;TZID=America/New_York:20100429T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com RECURRENCE-ID;TZID=America/New_York:20100429T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Piers Coleman\n[Institution] Rutgers University\n[Ti tle] Qu-transitions. Phase transitions in the quantum era.\n[Abstract] Phys icists are often so awestruck by the lofty achievements of the past\, we en d up thinking all the big stuff is done\, which blinds us us to the revolut ions ahead. We are still firmly in the throes of the quantum revolution tha t began a hundred years ago. Quantum gravity\, quantum computers\, qu-bits and quantum phase transitions\, are manifestations of this ongoing revoluti on. Nowhere is this more so\, than in the evolution of our understanding of the collective properties of quantum matter. Fifty years ago\, physicists were profoundly shaken by the discovery of universal power-law correlations at classical second-order phase transitions. Today\, interest has shifted to Quantum Phase Transitions: phase transitions at absolute zero driven by the violent jigglings of quantum zero-point motion. Quantum\, or Qu-transit ions have been observed in ferromagnets\, helium-3\, ferro-electrics\, heav y electron and high temperature superconductors. Unlike its classical count erpart\, a quantum critical point is a kind of "black hole" in the material s phase diagram: a singularity at absolute zero that profoundly influences wide swaths of the material phase diagram at finite temperature. I'll talk about some of the novel ideas in this field including "avoided criticality" - the idea that high temperature superconductivity nucleates about quantum critical points - and the growing indications that electron quasiparticles break up at a quantum critical point.\nHost: Victor Galitski\n[Note] Refre shment is serviced at 1:30pm in the Toll Room LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110304T180000Z DTEND:20110304T190000Z DTSTAMP:20260828T094430Z UID:44ve5qbk6d7pqbiu0dle1l4nio@google.com CREATED:20110221T155353Z DESCRIPTION:Title : Evolution of a Stick: Vertically Aligned Carbon Nanofib ers for Cellular Interfacing\nSpeaker Name: Anatoli Melechko\nSpeaker Insti tution : North Carolina State University\nNotes: Materials Science and Engi neering Seminar Series\nAbstract : The ability to synthesize carbon nanofib res (CNFs) with a high degree of control over their geometry\, location and structure via catalytic plasma-enhanced chemical vapor deposition has expa nded the possibility of new applications. The nanoscale dimensions and high aspect ratio of vertically aligned carbon nanofibres (VACNFs)\, along with favorable physical and chemical characteristics\, has provided a nanostruc tured material with properties that are well-suited for interfacing with li ve cells and tissues. Some of the aspects of synthesis\, integration and fu nctionalization of VACNFs\, followed by examples of how VACNFs have been us ed to interface with live systems for a variety of advanced nanoscale biolo gical applications will be described. LAST-MODIFIED:20230127T203556Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AMO Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110307T150000 DTEND;TZID=America/New_York:20110307T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110307T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] Very Weak Interactions\n[Speaker] Itay Yavin\, a candid ate of Particle Theory faculty position\n[Institution] CCPP\, New York Univ ersity\n[Abstract] What lies beyond the Standard Model of particle physics? Are there very weakly interacting forms of matter and forces waiting to be discovered? In this talk I will describe some of the efforts underway to d etect very weakly interacting particles\, from dark matter to new forces. I will discuss recent observations and their theoretical significance as wel l as the connection to other experimental results. I will conclude with a s hort summary of the different frontiers and their interrelations. \n LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110405T171500Z DTEND:20110405T183000Z DTSTAMP:20260828T094430Z UID:jms48g8b7ckjfcuuulr6fov45c@google.com CREATED:20110329T130344Z DESCRIPTION:Title : The Role of Reinforcement on Social Dynamics\nSpeaker N ame: Professor Sidney Redner\nSpeaker Institution : Boston University\n LAST-MODIFIED:20230127T202954Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080922T200000Z DTEND:20080922T210000Z DTSTAMP:20260828T094430Z UID:uaiv8vq1mcig9s20lm6ep8ugo4@google.com CREATED:20080917T151427Z DESCRIPTION:Speaker: Professor Marco Colombini\, Department of Biology\,\n University of Maryland\nTitle: "Inferring Channel Structure and Dynamics from Functional Studies" LAST-MODIFIED:20230127T203153Z LOCATION:IPST Building Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110221T210000Z DTEND:20110221T220000Z DTSTAMP:20260828T094430Z UID:rj0pdlohdgcfav6kuhii16k718@google.com CREATED:20110211T144226Z DESCRIPTION:Title : A Simple Ising-Like Model for Protein Folding\nSpeaker Name: Dr. William A. Eaton\nSpeaker Institution : National Institutes of He alth\nNotes: Refreshments at 3:45PM LAST-MODIFIED:20230127T203221Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS/IPST SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091105T190000Z DTEND:20091105T203000Z DTSTAMP:20260828T094430Z UID:4rgpimegq3eubgdfjndfghaj38@google.com CREATED:20091022T145530Z DESCRIPTION:Title: Extreme Metamaterials \nName: Professor Nader Engheta \n Institution: University of Pennsylvania \nAbstract: In this talk\, I discus s the merging of two phenomena\, the extreme-parameter\nmetamaterials with the plasmonic optics. It is well known that the surface plasmon\npolaritons (SPP) in plasmonic structures possess apparent wavelengths along the\nmeta llic interfaces that are shorter than the free space wavelength. In the fie ld of\nmetamaterials\, materials with extreme values for relative permittiv ities (or\npermeability)\, e.g.\, epsilon-near-zero (ENZ) materials exhibit refractive index\nbeing near zero\, resulting in essentially uniform phase and very long apparent\nwavelengths in such media. In my group we have bee n interested in exploring the\nmerging of these two seemingly opposite feat ures\, by combining ENZ\nmetamaterials with the SPP waves in plasmonic opti cs. We have been developing\nand exploring fundamental concepts and various potential applications of extremeparameter\nplasmonic metamaterials. We ha ve shown ENZ-based enhanced\ntransmission through ultranarrow channels and bends with arbitrary shapes and\nforms\, we have theoretically studied enha ncement of molecular emission near\nENZ-inspired plasmonic structures\, and confinement of highly intense electric\nfield in a channel. We have also i nvestigated how ENZ materials manipulate the\nphase patterns of beams. As a nother application of ENZ metamaterials\, we have\nbeen investigating the s cattering-cancelation-based plasmonic and metamaterial\ncloaking using ENZ media. In this talk\, I will give an overview of this ENZ-based\nplasmonics \, will discuss exciting potentials and future ideas and possibilities.\nBi ography: Nader Engheta is the H. Nedwill Ramsey Professor of Electrical and Systems Engineering\, and Professor of Bioengineering\, at the University of Pennsylvania. He received his B.S. degree in EE from the University of Tehran\, and his M.S and Ph.D. degrees in EE from Caltech. Selected as one of the Scientific American Magazine 50 Leaders in Science and Technology i n 2006 for developing the concept of optical lumped nanocircuits\, he is a Guggenheim Fellow\, an IEEE Third Millennium Medalist\, IEEE Fellow\, Ameri can Physical Society Fellow\, Optical Society of America Fellow\, and the r ecipient of the 2008 George H. Heilmeier Award for Excellence in Research f rom UPenn\, the Fulbright Naples Chair Award\, NSF Presidential Young Inves tigator award\, the UPS Foundation Distinguished Educator term Chair\, and several teaching awards including the Christian F. and Mary R. Lindback Fou ndation Award and S. Reid Warren\, Jr. Award. His current research activi ties span a broad range of areas including metamaterials and plasmonics\, n anooptics and nanophotonics\, biologically-inspired sensing and imaging\, m iniaturized antennas and nanoantennas\, physics and reverse-engineering of polarization vision in nature\, mathematics of fractional operators\, and p hysics of fields and waves phenomena. He has co-edited the book entitled “ Metamaterials: Physics and Engineering Explorations” by Wiley-IEEE Press\, 2006.\nRefreshment will be served at 1:30pm in Toll Room.\n LAST-MODIFIED:20230127T203814Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121206T210000Z DTEND:20121206T220000Z DTSTAMP:20260828T094430Z UID:tqeam4s61arkbpjtojubt30eqs@google.com CREATED:20121121T163302Z DESCRIPTION:Speaker: Robert Fischell \nTitle: Implanted Computers for Creat ing Improved Medical Treatments\n LAST-MODIFIED:20230127T202938Z LOCATION:1103 Bioscience Research Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY: 2012 FISCHELL LECTURE/Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100401T140000 DTEND;TZID=America/New_York:20100401T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com RECURRENCE-ID;TZID=America/New_York:20100401T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Mark Stiles\n[Institution] NIST\n[Title] "Domain Wal l Motion in Magnetic Nanowires" LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120717T150000Z DTEND:20120717T160000Z DTSTAMP:20260828T094430Z UID:15sd1upo3sh5f89pe61i0p65tk@google.com CREATED:20120716T154317Z DESCRIPTION:The physics behind the piano is almost as beautiful as the musi c it produces\, from Beethoven to Brubeck. A closer look at this instrument illustrates fascinating physical aspects of music in general.\n\nWhy does the grand piano have its peculiar shape\, why are the lower strings "ribbed \," why are there only 12 notes in the Western scale\, why are fifths not " perfect" on the piano and how important is the sounding board?\n\nProfessor Chris Monroe will discuss these and other "whys" of the piano and music in general and offer plenty of examples.\n\nMore information at\, http://clar icesmithcenter.umd.edu/2010/c/performances/performance?rowid=16624 LAST-MODIFIED:20230127T203032Z LOCATION:Gildenhorn Recital Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PIANO PHYSICS TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131107T190000Z DTEND:20131107T203000Z DTSTAMP:20260828T094430Z UID:nn57c45up1rp2jqehssvnvl3oc@google.com CREATED:20131024T152832Z DESCRIPTION:Speaker: David Vanderbilt\, Rutgers University\n\nTitle: Intr oduction to the theory of topological insulators\n\nAbstract: One of the "h ot topics" in condensed-matter theory in the last decade has been the disco very and investigation of so-called "topological insulators" (TIs). Heuris tically speaking\, these are materials whose ground-state electron wavefunc tions wrap around the Brillouin zone with a "twist" that cannot be removed without closing the band gap. In this talk\, I will first give an introduc tion to Berry phases and curvatures\, mathematical objects that are essenti al for describing the topological states in question. I will then give a b rief survey of the different types of topological states that are currently of such interest\, including quantum anomalous Hall (QAH) and quantum spin Hall (QSH) systems in 2D\, and strong and weak TIs in 3D. Finally\, I wil l briefly review some of our own recent work in which we propose the deposi tion of atoms with strong spin-orbit interactions onto the surfaces of magn etic insulators as a promising route toward the synthesis of QAH systems. These hold promise to reproduce the physics of the famous quantum Hall effe ct\, but without the usual constraints of low temperature and applied magne tic field. \n\nHost: Dr. Kostyantyn Kechedzhi LAST-MODIFIED:20230127T203728Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091207T171500Z DTEND:20091207T181500Z DTSTAMP:20260828T094430Z UID:chl0puvh63lh7uivvev3sddcac@google.com CREATED:20091022T134255Z DESCRIPTION:Title : AppEl Seminar - Control of molecular alignment in the a tmosphere for enhanced long-range propagation and detection\nSpeaker Name: Howard Milchberg\nSpeaker Institution : UMD - IREAP\,ECE\,IPST\,PHYSICS LAST-MODIFIED:20230127T203548Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Research in Electronics & Applied Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121203T164500Z DTEND:20121203T173000Z DTSTAMP:20260828T094430Z UID:pph47bdndvdv700lgmccqrsd4s@google.com CREATED:20121126T195543Z LAST-MODIFIED:20230127T203823Z LOCATION:Physics 1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091008T161500Z DTEND:20091008T171500Z DTSTAMP:20260828T094430Z UID:qjv1ir9sh8v924qadje4bdsp7g@google.com CREATED:20091006T135641Z DESCRIPTION:Title: The Nonlinear Schroedinger Equation with Disorder: Re sults and Puzzles\nSpeaker: Shmuel Fishman\, The Technion\, Israel LAST-MODIFIED:20230127T203316Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221012T150000Z DTEND:20221012T160000Z DTSTAMP:20260828T094430Z UID:59k9v8p2chn0qkams0jhe2h5gu@google.com CREATED:20220804T154504Z DESCRIPTION:Literature Seminar

      Speaker: Ovuokenye Omadoko

      Title: \;      Photochemical Reduction of Carbon Dioxide using Ru(bpy)3^(2+) Sensitizer and Diff erent Photocatalysts


      Abstrac t: \;https://chem.umd.edu/events/photochemical-reduction-carbon-dioxide-usin g-rubpy32-sensitizer-and-different-photocatalysts LAST-MODIFIED:20221011T164526Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221121T160000Z DTEND:20221121T170000Z DTSTAMP:20260828T094430Z UID:4ab6a7ucotdbahm9i85gqeeafd@google.com CREATED:20220824T171830Z DESCRIPTION:Speaker: Hong Tang\, Yale University


      Title: \;Hybrid Quantum Photo nic Circuits and Quantum Frequency Conversion

      Abstract: \;The ability to generate\, detect and manipulate photons with high fid elity is of critical importance for both fundamental quantum optics studies and practical device applications. Quantum frequency conversion\, in parti cular\, is in great demand for bridging the carrier frequency gaps in quant um networks and hybrid quantum systems. The efficiency of photon control in cluding quantum frequency conversion is dictated by photon-photon interacti on in a nonlinear optical media. However\, the mainstream integrated photon ic platform such as those based on silicon and silicon nitride lack the pre ferred (2) optical nonlinearity\, which limits the strength of photon-phot on coupling and many active photon control functionalities. In this talk\, I will present our progresses in developing hybrid quantum photonics platfo rm based on nonlinear (2) materials and their interface with superconducti ng circuits for achieving efficient detection\, generation\, and manipulati on of single photons as well as high fidelity quantum frequency conversion. LAST-MODIFIED:20221109T165842Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Hong Tang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110225T180000Z DTEND:20110225T213000Z DTSTAMP:20260828T094430Z UID:6s0k99bu35dv187anggp8knn2c@google.com CREATED:20110218T191822Z DESCRIPTION:Speakers: Alice Harding\, Tod Strohmayer\, Margaret Trippe\, Co le Miller\, Kevork Abazajian\, Zavan Arzoumanian\n LAST-MODIFIED:20230127T203641Z LOCATION:Computer and Space Sciences Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium: "Millisecond Pulsars" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110920T173000Z DTEND:20110920T183000Z DTSTAMP:20260828T094430Z UID:j2ob35qliu9j7ogdpnf9f09rfo@google.com CREATED:20110907T190711Z DESCRIPTION:Speaker: Nima Arkani-Hamed\nInstitution: Institute for Advanced Studies\nTitle: "Grassmannian Polytopes and Quantum Field Theory"\n\n* Pro f. Arkani-Hamed will meet with graduate students at 11am in room 4102. LAST-MODIFIED:20230127T203114Z LOCATION:4102 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Elementary Particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130916T160000Z DTEND:20130916T170000Z DTSTAMP:20260828T094430Z UID:7n4vgm8brl6n9cjspre92p6qak@google.com CLASS:PUBLIC CREATED:20130910T201651Z DESCRIPTION:JQI Luncheon LAST-MODIFIED:20230127T203050Z LOCATION:CSS Room 2115 - JQI Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100415T140000 DTEND;TZID=America/New_York:20100415T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com RECURRENCE-ID;TZID=America/New_York:20100415T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Joshua Folk\n[Institution] University of British Col umbia\n[Title] "Ballistic spin resonance: a new tool to study spin physics in semiconductors"\n[Abstract] Electron spin resonance (ESR) has been a pow erful tool for studying spins in condensed matter systems since its discove ry in 1944. This seminar will present a fundamentally new version of spin resonance that is ideally suited to devices in semiconductor high-mobility electron gas\, in which the oscillating transverse magnetic field from conv entional ESR is replaced by ballistic bouncing trajectories of electrons su bject to spin-orbit interaction. Analogous to continuous-wave ESR\, the spi n relaxation rate is dramatically enhanced on resonance. This enhanced rel axation is easily detected in a non-local spin diffusion measurement\, real ized in a micron-wide channel of GaAs 2D electron gas. A few of the effect s that can be studied by this technique will also be described\, including the first direct measurement of extreme spin-orbit anisotropy in a GaAs het erostructure\, and many-body enhancements to the Lande g-factor.\n[Note] Re freshment is serviced at 1:30pm in the Toll Room.\n LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090501T180000Z DTEND:20090501T190000Z DTSTAMP:20260828T094430Z UID:pqqb12tsugbpnh3g4u11k77jes@google.com CREATED:20090407T202704Z DESCRIPTION:Title: Accelerating Particles to Relativistic Speeds with Laser s\nSpeaker: Professor Howard Milchberg\, University of Maryland LAST-MODIFIED:20230127T203411Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sigma Pi Sigma Lecture Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100506T140000 DTEND;TZID=America/New_York:20100506T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com RECURRENCE-ID;TZID=America/New_York:20100506T140000 CREATED:20100308T142616Z DESCRIPTION:Cancelled. LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221021T160000Z DTEND:20221021T170000Z DTSTAMP:20260828T094430Z UID:6ikjk8htm7239ak78uto8m9mnd@google.com CREATED:20221013T002036Z DESCRIPTION:Title: Continuous-variable quantum state designs: theory and a pplications\nSpeaker: Joseph Iosue (QuICS and JQI)\nTime: Friday\, Octobe r 21\, 2022 - 12:00pm\nLocation: ATL 2324\n\nQuantum state and unitary t-d esigns play an important role in several applications\, including tomograph y\, randomized benchmarking\, state discrimination\, cryptography\, sensing \, and fundamental physics. In this work\, we generalize the notion of stat e designs to infinite-dimensional\, separable Hilbert spaces. We first prov e that under the definition of continuous-variable (CV) state t-designs fro m [Comm. Math. Phys 326\, 755-771 (2014)]\, no state designs exist for t≥2. Similarly\, we prove that no CV unitary t-designs exist for t≥2. We propos e an alternative definition for CV state designs\, which we call rigged t-d esigns\, and provide explicit constructions for t=2. As an application of r igged CV designs\, we develop a protocol for the shadow tomography of CV st ates. We then regularize rigged t-designs and construct energy-constrained CV state designs. Using regularized-rigged designs\, we develop the notion of the average fidelity of a CV quantum channel. We provide an explicit for mula for the average fidelity between an ideal displacement operation and i ts experimental approximation. Moreover\, analogous to qudits\, we establis h a relationship between the average gate fidelity to entanglement fidelity for CV operations.\n\n(Pizza and refreshments will be served after the tal k.) LAST-MODIFIED:20221013T002036Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Joseph Iosue TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091119T190000Z DTEND:20091119T203000Z DTSTAMP:20260828T094430Z UID:strucbrdf6j5v893akop8a362o@google.com CREATED:20091111T172817Z DESCRIPTION:[Title] Theories of the Time-Reversal Symmetry Breaking and the \nPolar Kerr Effect in Sr2RuO4 and Underdoped Cuprates\n[Speaker] Professor Victor Yakovenko\n[Institution] University of Maryland\n[Abstract] In the tour-de-force experiments [1]\, the group of Kapitulnik at Stanford\nobserv ed spontaneous time-reversal symmetry breaking in unconventional\nsupercond uctors Sr2RuO4 and underdoped cuprates by measuring the\noptical polar Kerr effect. In this talk\, I discuss challenges [2] in theoretical\ncalculatio n of the Kerr angle for Sr2RuO4 in the p_x+ip_y superconducting\nstate\, wh ich represents Copper pairing with non-zero angular momentum\nL_z=1. We fou nd that a non-zero Kerr effect requires electron scattering\non impurities and calculated the spontaneous ac Hall conductivity due to\nthis scattering . Then\, I present a scenario of the chiral d+id density wave\n[3]\, which we proposed to explain the time-reversal symmetry breaking in\nunderdoped Y BCO. This state has staggered electron currents circulating\naround the pla quettes of a square lattice\, whereas the symmetry between\nthe plaquettes is broken in a checkerboard manner. Alternative scenarios\nwill be also dis cussed.\n[1] J. Xia et al.\, PRL 97\, 167002 (2006)\; 100\, 127002 (2008)\; New J Phys 11\,\n055060 (2009).\n[2] V.M. Yakovenko\, PRL 98\, 087003 (200 7)\; R.M. Lutchyn\, P. Nagornykh\, and\nV.M. Yakovenko\, PRB 77\, 144516 (2 008)\; PRB 80\, 104508 (2009).\n[3] S. Tewari\, C. Zhang\, V.M. Yakovenko\, and S. Das Sarma\, PRL 100\, 217004\n(2008)\; PRB 78\, 174508 (2008).\nHos t: Victor Galitski\n*Preceded by refreshment at 1:30pm in the Toll Room. LAST-MODIFIED:20230127T203817Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090526T160000Z DTEND:20090526T170000Z DTSTAMP:20260828T094430Z UID:5qdhnbgi4uaaicbtgu4pk13pqk@google.com CREATED:20090522T161148Z DESCRIPTION:Title: CONTROLLING COMPLEX DYNAMICS\nSpeaker: Miquel Sanjuan\, U. Rey Juan Carlos\, Madrid\n\n*Pizza and drinks will be available for purc hase. LAST-MODIFIED:20230127T203204Z LOCATION:Room 1207\, Energy Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Pizza Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130425T180000Z DTEND:20130425T193000Z DTSTAMP:20260828T094430Z UID:ktfkk12bngcr7p1fo3jjcsruh4@google.com CREATED:20130416T221742Z DESCRIPTION:Speaker: Andrei Bernevig\, Princeton University\n\nTitle: Fra ctional Topological Insulators\n\nAbstract:\nTopological insulators are ban d insulators not adiabatically continuable to the atomic limit. Their simpl est variety\, the Chern insulators\, exhibit a nonzero Hall conductance but preserve the lattice translation symmetry. We conclusively show that a par tially filled interacting Chern insulator at 1/3 filling exhibits a fractio nal quantum Hall effect and rule out charge-density wave states. The system is incompressible and has a 3-fold degenerate groundstate whose momenta ca n be computed by deriving (for Chern insulators) a generalized Pauli princi ple (Haldane statistics) similar to that applicable in the fractional quant um Hall effect but augmented by lattice folding. Excitations of the system are fractionalized\; their total counting matches that of quasiholes in the Laughlin state based on the same generalized Pauli principle. The entangle ment spectrum of the state has a clear entanglement gap which seems to rema in finite in the thermodynamic limit. The levels below the gap exhibit the identical counting of Laughlin 1/3 quasiholes. All the properties above di sappear in the trivial state of the insulator. We also stabilize many other abelian and non-abelian states on the lattice. New model wavefunctions for states in band of Chern numbers greater than 1 are proposed\, who do not h ave analogues in Fractional Quantum Hall Physics. \n\nHost: Sunny Wang LAST-MODIFIED:20230127T203359Z LOCATION:Phys Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120910T154500Z DTEND:20120910T163000Z DTSTAMP:20260828T094430Z UID:80gb8djbeph1fljg59qghrvlp0@google.com CREATED:20120906T165222Z LAST-MODIFIED:20230127T203045Z LOCATION:1305F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081211T190000Z DTEND:20081211T201500Z DTSTAMP:20260828T094430Z UID:ngmipe0onh1ha53hhbjgov5p7c@google.com CREATED:20081203T163018Z DESCRIPTION:Title: Spin Transport in Ferromagnet Semiconductor Heterostruct ures \nSpeaker: Professor Paul Crowell\, University of Minnesota LAST-MODIFIED:20230127T203310Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120313T160000Z DTEND:20120313T171500Z DTSTAMP:20260828T094430Z UID:1o4kon0g5eoklc6sd1icme5n5o@google.com CREATED:20120220T155356Z DESCRIPTION:Dr. Jingyun Fan\nNIST LAST-MODIFIED:20230127T203551Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090220T180000Z DTEND:20090220T190000Z DTSTAMP:20260828T094430Z UID:d1v372t1t1p13d3p6bc41ii5v8@google.com CREATED:20090213T174241Z DESCRIPTION:Title: Chemical Methods of Nanofabrication: From “Cloning” Carb on Nanotubes to Massively Parallel Dip-Pen Nanolithography\nSpeaker: Yu-Hua ng Wang\, University of Maryland LAST-MODIFIED:20230127T203657Z LOCATION:Chemical and Nuclear Eng. Bldg.\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101007T163000Z DTEND:20101007T180000Z DTSTAMP:20260828T094430Z UID:bovvujdug5ial2a97eskorl05c@google.com CREATED:20100924T162158Z DESCRIPTION:SPEAKER: Vikram Soni - National Physics Lab\, New Delhi\nTITL E: Unraveling Magnetars\nABSTRACT: We consider a model where the strong m agnetic fields of \nmagnetars arise from a high baryon density\, magnetized core. In this \nframework magnetars are distinguished from pulsars by thei r higher \nmasses and central density. For magnetars\, as core densities ex ceed a \nthreshold\, the strong interaction induces a phase transition to a neutral \npion condensate that aligns all magnetic moments. The core magne tic field \nis initially shielded by the ambient high conductivity plasma. With time \nthe shielding currents dissipate transporting the core field ou t\, first to \nthe crust and then breaking through the crust to the surface of the star. \nRecent observations provide strong support for this model w hich accounts \nfor several properties of magnetars and also enables us to identify new \nmagnetars.\n LAST-MODIFIED:20230127T203753Z LOCATION:Physics Rm 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120306T170000Z DTEND:20120306T180000Z DTSTAMP:20260828T094430Z UID:f8qepqdpcnkgjj9c7c300h7s6g@google.com CREATED:20120220T155329Z DESCRIPTION:"Diffractive Optics for Micro-Arc-Second X-ray and\nGamma-Ray Astronomical Imaging"\nDr. Gerry Skinner\nUniversity of Maryland / NASA LAST-MODIFIED:20230127T202941Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090921T163000Z DTEND:20090921T173000Z DTSTAMP:20260828T094430Z UID:mc4u0e4tes0r7oc12pijrsd2l0@google.com CREATED:20090915T204253Z DESCRIPTION:Title : Synthetic vector potentials and electromagnetic fields created with light\nSpeaker Institution : JQI / NIST\nAbstract : Ultra cold atoms are remarkable systems with a truly unprecedented level of experimen tal control and one application of this control is engineering the systems hamiltonian. To date this has focused mostly on the real-space potential t hat the atoms experience for example\, multiple-well traps or optical latti ce potentials. Here I present our experimental work which tailors the ener gy-momentum dispersion of the cold atoms. We couple different internal sta tes of rubidium 87 via a momentum-selective Raman transition and load our s ystem into the resulting adiabatic eigenstates. Using this technique we sh ow the controlled modification of the energy-momentum dispersion leads to a synthetic vector potential. With the engineered vector potential in hand\ , we will see how suitable time dependence leads to synthetic electric fiel ds and how spatial gradients can produce synthetic magnetic fields.\n LAST-MODIFIED:20230127T203704Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090309T161500Z DTEND:20090309T171500Z DTSTAMP:20260828T094430Z UID:bkl4i5dmumsfshpfo71nubuf44@google.com CREATED:20090304T202711Z DESCRIPTION:Title: Fiberbundle-based visualization of a stir tank fluid \nS peaker: Werner Benger\, Louisiana State University\nMore Information: The a bstract: We describe a novel approach to treat data from a complex numerica l simulation in a unified environment using a generic data model for scient ific visualization. The model is constructed out of building blocks in a hi erarchical scheme of seven levels\, out of which only three are exposed to the end-user. This generic scheme allows for a wide variety of input format s and results in powerful capabilities to connect data. We review the theor y of this data model\, implementation aspects in our visualization environm ent\, and its application to computational fluid dynamic simulation coverin g a fluid in a stir tank. The computational data are given as a vector fiel d and a scalar field describing pressure on 2088 blocks in curvilinear coor dinates. LAST-MODIFIED:20230127T203801Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar Joint with CSCAMM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110310T173000Z DTEND:20110310T183000Z DTSTAMP:20260828T094430Z UID:7plvkni3mjdtd0kocdjl72lu9c@google.com CREATED:20110303T215729Z DESCRIPTION:Title: The Computational Structure of Spike Trains\nSpeaker: Pr of. Cosma Shalizi\, Carnegie Melon University LAST-MODIFIED:20230127T203520Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120910T160000 DTEND;TZID=America/New_York:20120910T173000 RRULE:FREQ=WEEKLY;UNTIL=20121210T210000Z;BYDAY=MO EXDATE;TZID=America/New_York:20120917T160000 EXDATE;TZID=America/New_York:20121008T160000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com CREATED:20120904T140915Z LAST-MODIFIED:20230127T203255Z LOCATION:Room 1116\, IPST Bldg. Bldg. 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221006T180000Z DTEND:20221006T193000Z DTSTAMP:20260828T094430Z UID:2cf2otut2a6rhv1efie1tpnioi@google.com CREATED:20220920T193411Z DESCRIPTION:Title: Three-state nematicity and magneto-opt ical Kerr effect in the charge density waves in Kagome superconductors
      < br>Abstract: The kagome lattice provides a fascinating playground to study geometrical frustration\, topology and strong correlations. The newly disco vered kagome metals AV3Sb5 (A=K\, Rb\, Cs) exhibit various interesting phen omena including topological band structure\, symmetry-breaking charge densi ty waves (CDWs) and superconductivity. Nevertheless\, the nature of the sym metry breaking in the CDW phase is not yet clear\, despite the fact that it is crucial to understand whether the superconductivity is unconventional. In this work\, we perform scanning birefringence microscopy and find that s ix-fold rotation symmetry is broken at the onset of the CDW transition temp erature in all three compounds. Spatial imaging and angle dependence of the birefringence show a universal three nematic domains that are 120◦ to each other. We propose staggered CDW orders with a relative π phase shift betwe en layers as a possibility to explain the three-state nematicity in AV3Sb5. We also perform magneto-optical Kerr effect and circular dichroism measure ments on all three compounds\, and the onset of the both signals is at the CDW transition temperature\, indicating broken time-reversal symmetry and t he existence of the long sought loop currents in the CDW phase. Our work st rongly constrains the nature of the CDWs and sheds light on possible unconv entional superconductivity in AV3Sb5.

      Host: Johnpierre Paglione

      Seminar also on Zoom
      Meeting \;Link: \; \;< a href="https://umd.zoom.us/j/91301075848">https://umd.zoom.us/j/9130107 5848


      Refreshments 1:30pm 1117 Toll Ph ysics Bldg. LAST-MODIFIED:20221004T151009Z LOCATION:Toll Physics: Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Liang Wu\, University of Pennsylvania TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 6_Liang Wu.pdf;FMTTYPE=application/pdf:h ttps://drive.google.com/open?id=1-7ED6CgqtTB8pHW-3u3CO0ynTYVjb5ge&authuser= 0 END:VEVENT BEGIN:VEVENT DTSTART:20100110T003000Z DTEND:20100110T013000Z DTSTAMP:20260828T094430Z UID:s293n37hdgm6smgu634dbedf9o@google.com CREATED:20100106T140659Z DESCRIPTION:Experience vibrations\, with applications to waves\, sound\, an d light. Come early and make a ouija windmill.\n\nFor directions and furthe r information call 301-405-6045 or visit our web site.\nwww.physics.umd.edu /lecdem\nTo volunteer\, call 301-405-7935 or 301-405-5949. LAST-MODIFIED:20230127T203626Z LOCATION:Physics Lecture Hall SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun: Good Vibrations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101013T200000Z DTEND:20101013T210000Z DTSTAMP:20260828T094430Z UID:st3d6i0kemb6egn727f0it3t8o@google.com CREATED:20101007T175010Z DESCRIPTION:Title : Computational Fluid Modeling of Magnetized Plasmas in L aboratory and Space\nSpeaker Name: Dr. Vyacheslav Lukin\nSpeaker Institutio n : Naval Research Laboratory\nAbstract : It is well-known that 99% of visi ble matter is a plasma. And much of that\, from the UMD's MCX experiment to the intergalactic medium\, is a magnetized plasma. In recent years\, fuele d by the rapid advances in computational hardware and improved numerical me thods\, progress in theoretical understanding of magnetized plasmas has rel ied heavily on computational modeling. Here\, I will discuss one of the com mon computational approaches to tracking the dynamics of a magnetized plasm a\, /ab initio/ solution of extended magnetohydrodynamics (MHD) equations\, while using some of the latest numerical techniques developed by the appli ed mathematics community. I will describe the numerical code we use to mode l MHD plasma dynamics\, the two- and three-dimensional implicit spectral el ement code HiFi\, and some of the methods and underlying principles used in the development of the code. Finally\, I will provide several examples of the past and ongoing applications of the HiFi code to mo\n\ndeling of both laboratory and space plasmas.\n LAST-MODIFIED:20230127T203823Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120409T150000Z DTEND:20120409T160000Z DTSTAMP:20260828T094430Z UID:3alcj2itlfvlld4udqf0tj6880@google.com CREATED:20120404T131432Z DESCRIPTION:"Excitons in Semiconductor Nanocrystals and Plasmons in Metal N anoparticles\nas Probes of Ultrafast Dynamics"\nDr. Matthew Pelton\nArgonne National Laboratories LAST-MODIFIED:20230127T203652Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar\, Dr. Matthew Pelton TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230126T150000Z DTEND:20230126T160000Z DTSTAMP:20260828T094430Z UID:7tjsgfne8bd48io9eh2bqr9506@google.com CREATED:20230120T192400Z DESCRIPTION:Title:  To learn and cancel quantum noise: Probabilistic error cancellation with sparse Pauli-Lindblad models on noisy quantum processors< br>Speaker:  Zlatko Minev (IBM)
      Time:  Thursday\, January 26\, 2023 - 10 :00am
      Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/5942646305

      Error-mitigation techn iques can enable access to accurate estimates of physical observables that are otherwise biased by noise in pre-fault-tolerant quantum computers. One particularly general error-mitigation technique is probabilistic error canc ellation (PEC)\, which effectively inverts a well-characterized noise chann el to produce noise-free estimates of observables. Experimental realization s of this technique\, however\, have been impeded by the challenge of learn ing correlated noise in large quantum circuits. In this work\, we present a practical protocol for learning a sparse noise model that scales to large quantum devices and is efficient to learn and invert. These advances enable us to demonstrate PEC on a superconducting quantum processor with crosstal k errors\, thereby revealing a path to error-mitigated quantum computation with noise-free observables at larger circuit volumes. LAST-MODIFIED:20230120T192400Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/5942646305 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Zlatko Minev TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111031T163000Z DTEND:20111031T173000Z DTSTAMP:20260828T094430Z UID:ppvg9ok7iuhhm573ndkqknv2a4@google.com CREATED:20111020T143333Z DESCRIPTION:Speaker: Michael Levin\, University of Maryland\nTitle: Strongl y correlated topological insulators\nAbstract: Topological insulators are a new type of band insulator. They are distinguished by the fact that their edges (in the 2D case) or surfaces (in the 3D case) support gapless transpo rt which is extremely robust. In the two dimensional case\, topological ins ulators can be thought of as time reversal invariant analogues of integer q uantum Hall states. This analogy is intriguing since integer quantum Hall s tates are a special case of the far richer class of fractional quantum Hall states. It is natural to wonder: can topological insulators also be genera lized? \n\n\n\n LAST-MODIFIED:20230127T202950Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SEMINAR - MICHAEL LEVIN TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131212T190000Z DTEND:20131212T203000Z DTSTAMP:20260828T094430Z UID:eb73gt4sp1nrjmoeibo01hdgh0@google.com CREATED:20131024T160040Z DESCRIPTION:CANCELLED LAST-MODIFIED:20230127T203028Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111019T163000Z DTEND:20111019T173000Z DTSTAMP:20260828T094430Z UID:onaspgpach4adlq3io8bemr5cc@google.com CREATED:20110923T170635Z DESCRIPTION:SPEAKER: Yu Jia - IHEP\, Chinese Academy of Sciences\nTITLE: S ome Recent Progress in Understanding Heavy Quarkonia Electromagnetic Decays \n(continuation from Sept. 14 seminar)\nABSTRACT: In this talk\, I report some novel theoretical progresses in understanding heavy quarkonium radiat ive decay processes. In particular\, I will focus on two phenomenologicall y-interesting M1 transition processes: \nX(3872)-->J/psi (psi')+gamma and U psilon(3S)--> eta_b+gamma. For the former process\, we find that the recent proposal of assigning X(3872) of J^{PC}=2^{-+} is in stark contradiction w ith the existing B factory measurements\; for the latter process\, taking i nto account the fact that the emitted photon becomes rather energetic (E_ga mma = 1 GeV)\, we propose the conventional multipole-expansion approach sho uld be given up and we develop a novel "hard scattering" mechanism. It is f ound that this new mechanism can naturally account for the BaBar measuremen t without any adjustable ad hoc input parameters. LAST-MODIFIED:20230127T203618Z LOCATION:Physics Rm 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nucl Phys Lunch-time talk (replaces formal seminar) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090216T173000Z DTEND:20090216T183000Z DTSTAMP:20260828T094430Z UID:hrnpb0ouuv8i9992ga628f0lpg@google.com CREATED:20090202T163220Z DESCRIPTION:Title: Defects in degenerate trapped gases\nSpeaker: Leslie Bak smary\,Rice University LAST-MODIFIED:20230127T203632Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131209T160000Z DTEND:20131209T173000Z DTSTAMP:20260828T094430Z UID:9ft6lfa49qf8andb7g1e7v0t5s@google.com CLASS:PUBLIC CREATED:20130823T175020Z DESCRIPTION:Speaker: Stefan Kuhr\n\nInstitution: University of Strathclyde\ n\nTitle: Probing strongly correlated quantum systems \n\nAbstract: Ultraco ld atoms in optical lattices are a versatile tool to investigate fundamenta l properties of quantum many body systems. In a series of experiments\, I d emonstrated how the control of such systems can be extended down to the mos t fundamental level of single atomic spins at specific lattice sites. Using a high-resolution optical imaging system\, we were able to obtain fluoresc ence images of strongly interacting bosonic Mott insulators with single-ato m and single-site resolution [1] and addressed the atomic spins with sub-di ffraction-limited resolution [2]. In addition\, we directly monitored the t unneling quantum dynamics of single atoms in the lattice\, and observed qua ntum-correlated particle-hole pairs [3] spreading of correlations after a p arameter quench [4]\, and the quantum dynamics of spin-impurities [5]. A ne w experimental setup involving fermionic 40K is currently under constructio n at the University of Strathclyde. Our goals are the single-atom-resolved observation of strongly correlated fermionic systems\, implementation of no vel cooling schemes\, engineering of quantum many-body phases and experimen ts for quantum information processing.\n \n[1] J. F. Sherson\, C. Weitenber g\, M. Endres\, M. Cheneau\, I. Bloch\, S. Kuhr\, Single-atom-resolved fluo rescence imaging of an atomic Mott insulator\, Nature 467\, 68 (2010).\n \n [2] C. Weitenberg\, M. Endres\, J. F. Sherson\, M. Cheneau\, P. Schauß\, T. Fukuhara\, I.Bloch\, S. Kuhr\, Single-spin addressing in an atomic Mott in sulator\, Nature 471\, 319 (2011).\n \n[3] M. Endres\, M. Cheneau\, T. Fuku hara\, C. Weitenberg\, P. Schauß\, C. Gross\, L. Mazza\, M.C. Banuls\, L. P ollet\, I. Bloch\, S. Kuhr\, Observation of Correlated Particle-Hole Pairs and String Order in Low-Dimensional Mott Insulators\, Science 334\, 200 (20 11).\n \n[4] M. Cheneau\, P. Barmettler\, D. Poletti\, M. Endres\, P. Scha uß\, T. Fukuhara\, C. Gross\, I. Bloch\, C. Kollath\, S. Kuhr\, Light-cone- like spreading of correlations in a quantum many-body system\, Nature 481\, 484 (2012).\n \n[5] T. Fukuhara\, A. Kantian\, M. Endres\, M. Cheneau\, P. Schauß\, S. Hild\, D. Bellem\, U. Schollwöck\, T. Giamarchi\, C. Gross\, I . Bloch\, S. Kuhr\, Quantum dynamics of a single\, mobile spin impurity\, N ature Physics 9\, 235 (2013)\n - See more at: http://jqi.umd.edu/events/201 3/12/09/probing-strongly-correlated-quantum-systems#sthash.L66uTZ8u.dpuf\n\ n LAST-MODIFIED:20230127T203403Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Stefan Kuhr TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100302T160000 DTEND;TZID=America/New_York:20100302T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100302T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Dr. Charles Clark\, Joint Quantum Institute\, NIST and University of Maryland\nTitle: "Over the rainbow: extreme adventures in th e ultraviolet"\nAbstract: The shopkeepers' adage\, "If you don't see what y ou want\, just ask for\nit\," is a good guide to light just outside the lim its of human vision.\nExploration of the ultraviolet follows influences of philosophical\ndualism\, atomic spectroscopy\, nanotechnology\, climate cha nge and\nanimal vision. I present these stories from the perspective of\nme asurement science. LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221102T150000Z DTEND:20221102T160000Z DTSTAMP:20260828T094430Z UID:2nl9ff4f0k6ohkinm6g00nlmia@google.com CREATED:20220804T155040Z DESCRIPTION:Literature Seminar

      Speaker: Seungyeop Lee\, U MCP

      Title: \;      Nanophotonics with h-BN as a Single Pho ton Source LAST-MODIFIED:20221031T153056Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221121T170000Z DTEND:20221121T180000Z DTSTAMP:20260828T094430Z UID:3me2s8k1tdckblarrn092uig6l@google.com CREATED:20221114T184739Z DESCRIPTION:Title:  Grant Writing 1/2 (Education Grants)
      Speaker:  Erin Sohr (University of Maryland\, Physics)
      Time:  Monday\, November 21\, 20 22 - 12:00pm
      Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/5942646305

      How to write s uccessful grant proposals\, pushing your writing skills to the next level. Erin will provide a general overview of grant writing and focus on proposal s for education and outreach\, a key mandate of the NSF grant for the Quant um Leap Challenge Institute for Robust Quantum Simulation.

      Please pr epare your questions in advance and send them to rqs-seed@umiacs.umd.edu. LAST-MODIFIED:20221114T184739Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/5942646305 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Workshop: Erin Sohr TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110913T110000Z DTEND:20110913T120000Z DTSTAMP:20260828T094430Z UID:qjte4r1cdtd7krm3jh12vme5p0@google.com CREATED:20110907T174956Z DESCRIPTION:Speaker: Jennifer Burnhard\nTitle: Advanced Antennas: Enabling Fundamentally New Functionality in Cognitive and Software-Defined Radios\nA bstract: Emerging models for cognitive and software-defined radio often re ly solely on abilities to sense and/or adjust operating frequencies. These approaches envision antennas in a very traditional way\, assuming either b roadband or\, perhaps\, tunable frequency operation\, but nothing more. Ho wever\, if included early in the system concept and design cycle\, new kind s of advanced antennas\, including reconfigurable antennas and antenna arra ys\, promise to deliver a much deeper knowledge of the electromagnetic envi ronment than traditional antenna solutions\, as well as a much broader rang e of capabilities with which to use and leverage this environment to greate r effect. This presentation will highlight some of our ongoing work in the area of innovative antennas suitable for cognitive and software-defined ra dio\, including electrically small antennas\, direction-finding arrays\, an d reconfigurable adaptive arrays for small platforms. Areas for future res earch and collaboration between investigators in antennas\, radios\, commun ications\, signal processing\, and protocols will be highlighted. LAST-MODIFIED:20230127T203650Z LOCATION:Seminar Room\, Lower Level\, LPS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081104T150000Z DTEND:20081104T160000Z DTSTAMP:20260828T094430Z UID:891lguvq5qtqcmtv696k91lp64@google.com CREATED:20081029T170529Z DESCRIPTION:Title: "Time-Reversal Symmetry Breaking and Spontaneous Anomalo us Hall Effect in Fermi Fluids"\nSpeaker: Kai Sun\, U. of Illinois Urbana-C hampaign\nMore Information: cmtc.assistant@gmail.com LAST-MODIFIED:20230127T203808Z LOCATION:Physics Building\, Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090928T100000 DTEND;TZID=America/New_York:20090928T120000 RRULE:FREQ=DAILY;WKST=SU;UNTIL=20091002T140000Z DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com CREATED:00010101T000000Z DESCRIPTION:COLD ATOMS\nBin Wang\, “Quantum phase diagram of fermion mixtur es in 1D optical lattices”\nRyan Barnett\, “Vortex lattice locking in rotat ing BECs and spinor condensates”\nMaxim Dzero\, “Cooper pair turbulence in atomic traps”\nRajdeep Sensarma\, “Measuring many body correlations in cold -atom systems with optical lattice modulations”\nhttp://www.physics.umd.edu /cmtc/seminars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100212T203000Z DTEND:20100212T213000Z DTSTAMP:20260828T094430Z UID:4ps1mm300gscik6jjkroi1ftqc@google.com CREATED:20100211T061123Z DESCRIPTION:[Speaker] Larry Ford\n[Institution] Tufts University\n[Title] T he Probability Distribution for Quantum Stress Tensor Fluctuations\n[Abstra ct] In this talk\, I will first review some properties of the renormalized expectation values of quantum stress tensor. These expectation values can v iolate classical energy conditions\, and exhibit negative energy density. T he magnitude and duration of the negative energy density is\nconstrained by quantum inequalities. I will next review selected aspects of quantum stres s tensor flucutations and their potential physical effects. Finally\, I wil l report some recent work on the probability distribution for stress tensor flucutations. It can be shown that the vacuum probability distribution for the energy density averaged with a sampling function in time is necessaril y a skewed distribution\, with a\nfinite lower cutoff and an infinite posit ive tail. Furthermore\, this\ncutoff is at the quantum inequality bound on expectation values. An explicit result for the case of a massless scalar fi eld in two dimensional flat spacetime will be discussed. In this case\, mos t energy density fluctuations are negative\, but are counterbalanced by rar er but larger positive fluctuations. Some ongoing work in four dimensions a nd its possible applications will be discussed.\n LAST-MODIFIED:20230127T203837Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081010T150000Z DTEND:20081010T160000Z DTSTAMP:20260828T094430Z UID:18ico2fp5vbbjrbpa0elnmrpjo@google.com CREATED:20081003T150057Z DESCRIPTION:Title: Insect Flight: Aerodynamics\, Energetics\, and Evolution \nSpeaker: Jane Wang\, Cornell University\nMore Information: wlosert@umd.ed u LAST-MODIFIED:20230127T203812Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090430T161500Z DTEND:20090430T171500Z DTSTAMP:20260828T094430Z UID:07raj6hfqfibq6kd1i3f1r23kg@google.com CREATED:20090411T153639Z DESCRIPTION:Speaker: Wolfgang Losert\, (IREAP\, Physics\, IPST)\, Universit y of Maryland \nTitle: A Look Inside Sand: 3D Imaging of Particle Dynamics in Granular Flow LAST-MODIFIED:20230127T203134Z LOCATION:Large Conference Room (1207)\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110120T190000Z DTEND:20110120T200000Z DTSTAMP:20260828T094430Z UID:108j4bjusp0vvjk3etmlo99s4o@google.com CREATED:20110113T193445Z DESCRIPTION:Title : Physics of Incomplete Reconnection Process of the Sawto oth Crash and Recent Results from the KSTAR 2-D ECE Imaging System\nSpeaker Name: Hyeon K. Park\nSpeaker Institution : POSTECH\, Korea\nAbstract : Stu dy of the sawtooth physics via the upgraded Electron Cyclotron Emission Ima ging (ECEI) system on TEXTOR tokamak plasmas revealed new information conce rning the sawtooth crash process. This includes: 1) The details of\nincompl ete reconnection process with a wide range of crash time scales up to the r esistive time scale 2) observation of reversal of the toroidal rotation wit h co-injection tangential-neutral beam. Subsequently\, ECEI systems based o n the TEXTOR upgraded system have been developed for DIII-D\, ASDEX-UPGRADE (AUG) and Korean Superconducting Tokamak Advanced Research (KSTAR) to stud y various magnetohydrodynamic (MHD) instabilities. In particular\, the KSTA R ECEI system revealed various MHD physics in the core (sawtooth crash and e-fishbones) and edge (filamentation in ELMs and edge sheared rotation laye rs in H-mode\noperation).\n LAST-MODIFIED:20230127T203442Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091123T161500Z DTEND:20091123T171500Z DTSTAMP:20260828T094430Z UID:16hmdlnl9mao518e67j160d6u4@google.com CREATED:20091120T201921Z DESCRIPTION:Title: Top Quark and New Physics\nSpeaker: Qing-Hong Cao\nAffi liation: Argonne National Lab\n LAST-MODIFIED:20230127T203714Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Special Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131010T173000Z DTEND:20131010T180000Z DTSTAMP:20260828T094430Z UID:9h49j35d3f8k5lq483pnbi3iu4@google.com CREATED:20130918T130627Z LAST-MODIFIED:20230127T203421Z LOCATION:the "new" Toll Room\, Room 1305F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100108T003000Z DTEND:20100108T013000Z DTSTAMP:20260828T094430Z UID:lihghnmls8ealkjr7ilbv62lm0@google.com CREATED:20100106T140445Z DESCRIPTION:Experience vibrations\, with applications to waves\, sound\, an d light. Come early and make a ouija\nwindmill.\n\nFor directions and furth er information call 301-405-6045 or visit our web site.\nwww.physics.umd.ed u/lecdem\nTo volunteer\, call 301-405-7935 or 301-405-5949. LAST-MODIFIED:20230127T203515Z LOCATION:Physics Lecture Halls SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics is Phun: Good Vibrations TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110418T201500Z DTEND:20110418T213000Z DTSTAMP:20260828T094430Z UID:mdsvm3pe5ne3amc39iiaa2srco@google.com CREATED:20110413T145636Z DESCRIPTION:Title : How to Predict Space Weather using Solar Data\nSpeaker Name: Yong-Jae Moon\nSpeaker Institution : NASA GSFC & Kyung Hee University \, Korea\nAbstract: Space weather is the concept of changing environmental conditions in near-Earth space\, mainly caused by solar activity. Space wea ther monitoring and forecast models are essential for minimizing some disas ters associated with astronauts\, satellites and communications. We are dev eloping empirical space weather (geomagnetic storms\, solar proton events\, and solar flares) forecast models based on solar information. These models have been set up with the concept of probabilistic forecast using historic al events. Major findings can be summarized as follows. First\, we present a storm probability map depending on CME (Coronal Mass Ejection) parameters as well as contingency tables between prediction and observation with thei r statistical parameters. Second\, we suggest a new geoeffective CME parame ter\, earthward direction parameter\, and demonstrate its importance in ter ms of the forecast of geomagnetic storms. Third\, the importance of solar m agnetic field orientation for storm occurrence is examined. Fourth\, a new proton event forecast method depending on flare parameters (flare strength\ , duration\, and longitude) as well as CME parameters (speed and angular wi dth) is being developed. Fifth\, we are developing a solar flare forecast m odel depending on sunspot classification\, its area\, and its area change ( as a proxy of flux emergence). LAST-MODIFIED:20230127T203517Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110418T160000Z DTEND:20110418T163000Z DTSTAMP:20260828T094430Z UID:fudrh23qturo4o67gl2ag3g3po@google.com CREATED:20110329T174931Z LAST-MODIFIED:20230127T203056Z LOCATION:Physics 1305F"New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130211T173000Z DTEND:20130211T183000Z DTSTAMP:20260828T094430Z UID:2ov64ni717kbdhvvk5g5h74u4c@google.com CREATED:20130206T150905Z DESCRIPTION:\nSpeaker: Kang-Kuen Ni\, JILA\nTitle: New prospects for cold m olecular physics\n\nThe role of molecular spectroscopy in the broader inter ests of physics has evolved over the years. It was traditionally the study of molecular structure and its underlying quantum mechanics. Later\, it led to various applications including the first “atomic clock” that was actual ly based on molecular vibrations and to the observation of star light redsh ifts that reveal the expansion of the universe. More recent advances in tec hniques for quantum manipulation bring new directions to molecular physics where molecules serve as test systems to study a variety of phenomena. In t his talk\, I will discuss two examples. First\, we make use of the extreme electric fields found within a molecular bond in an experiment that aims to improve our knowledge of the electron's electric dipole moment (eEDM)\, wh ich will be sensitive to physics beyond the standard model. In the second e xample\, quantum control of molecular internal and external states enables the study of ultra-cold chemistry\, and may yield undiscovered quantum phas es of matter.\n LAST-MODIFIED:20230127T203821Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Kang Kuen Ni TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100407T200000Z DTEND:20100407T210000Z DTSTAMP:20260828T094430Z UID:mo5dq59rkq1g0hn9qmifh0rlpo@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100318T125751Z DESCRIPTION:Title : Angular Momentum of Light in Blowout Laser Wakefields\n Speaker Name: Dr. Daniel Gordon\nSpeaker Institution : Naval Research Labor atory\nAbstract : The angular momentum of light can be written as the sum o f a spin contribution and an orbital contribution. The angular momentum of Hermite-Gaussian and Laguerre-Gaussian modes is illustrated in terms of the flow of electromagnetic energy. The case where intense radiation with pure ly spin angular momentum interacts with a plasma is examined. Analysis and three dimensional simulations indicate that the spin contribution is nonlin early coupled into the orbital contribution. The scattered radiation is in the form of an electro-optic shock. Experimental results suggest that this radiation is useful as a diagnostic of blowout laser wakefields.\n LAST-MODIFIED:20230127T203151Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091028T200000Z DTEND:20091028T210000Z DTSTAMP:20260828T094430Z UID:9tv6pp35ekc7s3qb50ago91jug@google.com CREATED:20090925T142752Z DESCRIPTION:Title : Plasma Gun Development and Diagnostics\nSpeaker Name: D r. Sarah Messer\nSpeaker Institution : HyperV Technologies Corp.\nAbstract : We introduce the basic theory and phenomena associated with electromagnet ic plasma accelerators. We also present magnetic and optical measurements f or several guns\, including those recently used in an attempt to drive plas ma rotation in the Maryland Centrifugal Experiment (MCX). The initial MCX g un was a coaxial device designed to mitigate the blowby instability. The se cond one was a MiniRailgun with a rectangular bore oriented so that the MCX magnetic field augments the railgun's internal magnetic field. Tests at Hy perV indicate this MiniRailgun reaches much higher densities than the origi nal gun\, although muzzle velocity is slightly reduced. We discuss the impa ct of these guns on MCX for various conditions. We also give an overview of related gun-development projects and applications.\n LAST-MODIFIED:20230127T203331Z LOCATION:1207 Energy Research Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110214T150000 DTEND;TZID=America/New_York:20110214T160000 DTSTAMP:20260828T094430Z UID:gqcaqf5djbhkvnm4vhp9q1ush8@google.com RECURRENCE-ID;TZID=America/New_York:20110207T150000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Vector mesons and interpretation of Seiberg duality"\n [Speaker] Zohar Komargodski\n[Institution] Institute for Advanced Studies\, Princeton\n[Abstract] We interpret the dynamics of Supersymmetric QCD (SQC D) in terms of ideas familiar from the hadronic world. Some mysterious prop erties of the supersymmetric \ntheory\, such as the emergent magnetic gauge symmetry\, are shown to have analogs in QCD. On the other hand\, several p henomenological concepts\, such as "hidden local symmetry" and "vector meso n dominance\," are shown to be rigorously realized in SQCD. These considera tions suggest a relation between the flavor symmetry group and the emergent gauge fields in theories with a weakly coupled dual description. LAST-MODIFIED:20230127T203648Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100215T200000Z DTEND:20100215T210000Z DTSTAMP:20260828T094430Z UID:cr4vo16lqnkolvik7en7qsnk88@google.com CREATED:20100208T164925Z DESCRIPTION:[Speaker] Csaba Csaki\n[Institution] Cornell University\n[Title ] "Buried Higgs" LAST-MODIFIED:20230127T203541Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131101T170000Z DTEND:20131101T180000Z DTSTAMP:20260828T094430Z UID:ltunucpeevrpd4uc9i7gf4omj0@google.com CREATED:20131029T173345Z DESCRIPTION:Title : Extreme Ultraviolet: the Grand Adventure\n\nSpeaker Nam e: Charles Clark\n\nSpeaker Institution : Joint Quantum Institute\, NIST\n\ nNotes: This is a Materials Science and Engineering seminar.\n\nAbstract : This year marks the 100th anniversary of Niels Bohr's theory of the atom\, a breakthrough contribution to modern understanding of the microscopic stru cture of matter. One of the early predictive successes of Bohr's model occu rred in early 1914\, when hydrogen emission lines in the extreme ultraviole t (EUV) region of the spectrum were discovered by Theodore Lyman at precise ly the wavelengths predicted by Bohr's theory. The EUV region is one of the most difficult domains of the electromagnetic spectrum in which to conduct accurate measurement\, and its exploration began little more than a centur y ago. Yet the EUV contains a vast quantity of information about the univer se that cannot be found elsewhere\, and it is a subject of increasing impor tance in applications on earth. I will give an overview of the grand EUV ad venture.\n LAST-MODIFIED:20230127T203047Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110907T183000Z DTEND:20110907T200000Z DTSTAMP:20260828T094430Z UID:27kq01ck7hgsshtbg5lsuv0550@google.com CREATED:20110720T124832Z DESCRIPTION:SPEAKER: Ethan T. Neil - Fermilab\, Batavia IL\n\nTITLE: : La ttice Strong Dynamics and Electroweak Symmetry Breaking\n\nABSTRACT: Very soon\, the Tevatron and LHC experiments will reveal the true nature of the standard model Higgs sector. If no fundamental Higgs scalar is found\, a c ompelling alternative is given by models in which new strongly-coupled dyna mics is responsible for breaking electroweak symmetry. Such models could g ive rise to a rich spectrum of TeV-scale states\, similar to QCD at GeV sca les. I will present recent lattice simulation results which explore the dy namics of strongly-coupled gauge theories different from QCD\, including th e low-lying spectrum\, "pi-pi" scattering\, form factors and the S-paramete r.\n LAST-MODIFIED:20230127T203901Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131001T200000Z DTEND:20131001T210000Z DTSTAMP:20260828T094430Z UID:ij8asmhhbb9lolpb3v59ckb52g@google.com CREATED:20130821T145041Z DESCRIPTION:Speaker: Wolfgang Losert\, University of Maryland\nTitle: Dyn amics of Living Systems: From Actin Waves to Cell Migration\nAbstract: Livi ng systems are very dynamic. From the directed motion of individual immune cells chasing an invader to the intricate collective motion of cells in a developing embryo cellular motion is critical to life. The control of cell dynamics is of significant practical importance in tackling complex diseas es such as cancer\, where cell migration is central to cancer metastasis. But for systems of such complexity\, how can the dynamics even be character ized\, much less steered? While genomics has given us unprecedented quanti tative insight into the inner workings of the cell\, genetic and proteomic properties are highly variable from cell to cell and from patient to patien t. On the other hand\, the physical characteristics of cells have proven t o be more universal indicators of health and disease. Such characteristics include shape and stiffness\, which have both been used for diagnosis for more than a century. With this in mind\, we have developed novel approache s that quantitatively characterize the dynamics of shapes of migrating cell s\, ultimately connecting shape dynamics with the cellular biochemistry. S pecifically we have discovered that rapidly migrating cells move via persis tent shape waves. These mechanical waves of polymerizing actin are part of the dynamic\, biochemically controlled cellular scaffolding. We found tha t cells utilize such mechanical waves to sense and follow surface nanotopog raphy. The wave-like character of the sensing allows us to use our physics toolbox to thoroughly characterize these motions\, as well as develop nove l strategies to guide the migration of cells.\n LAST-MODIFIED:20230127T203358Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121112T160000 DTEND;TZID=America/New_York:20121112T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121112T160000 CREATED:20120904T140915Z DESCRIPTION:Title : In Searchof Concurrence Between Biological and Syntheti c Single Molecule Structure/Function\n\nSpeaker Name: Christy Landes\n\nSpe aker Institution : Rice University LAST-MODIFIED:20230127T203255Z LOCATION:Room 1103\, Bioscience Research Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111024T203000Z DTEND:20111024T213000Z DTSTAMP:20260828T094430Z UID:6ssc9ktki8b38qcmimcnkra358@google.com CREATED:20110831T182142Z DESCRIPTION:Title : Using Space as a Non-linear Plasma Laboratory\nSpeaker Name: Dennis Papadopoulus\nSpeaker Institution : University of Maryland\, D epartments of Physics and Astronomy\nNotes: Coffee\, Tea & Cookies 4:15-4:3 0 PM\nAbstract : Active cause-and-effect experiments are an extremely lever aged way to develop scientific understanding of the behavior of space plasm as. The recent sophistication and innovative use of ionospheric heaters\, a long with the fact that we can repeat the experiments for varying space con ditions makes them the mode of choice in using space as an open plasma and geophysics laboratory. Following a brief introduction to ionospheric heatin g results of recent experiments that utilized the ionospheric heater and di agnostic instrumentation of the High-Frequency Active Auroral Research Prog ram (HAARP) located in Gakona\, Alaska\, in conjunction with satellite and remote site ground measurements will be presented. LAST-MODIFIED:20230127T203033Z LOCATION:Location: Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081107T150000Z DTEND:20081107T201500Z DTSTAMP:20260828T094430Z UID:p5pn4pe6a5he0ahfr8hgjdrr4c@google.com CREATED:20081105T183903Z DESCRIPTION:Title: Research Overview\nSpeaker: CSCAMM faculty and postdocs\ , CSCAMM\nMore Information: A series of talks by CSCAMM faculty members hig hlighting their research. Click here for the schedule of speakers: http://w ww.cscamm.umd.edu/home/CSCAMM-day-schedule-2008.pdf LAST-MODIFIED:20230127T203506Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Day TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110919T200000Z DTEND:20110919T210000Z DTSTAMP:20260828T094430Z UID:u2a140q79753q8tsfc5bedj9ks@google.com CREATED:20110909T132954Z DESCRIPTION:Title : Molecular Force and Structure of Nucleic Acids Assembli es\nSpeaker Name: Professor Xiangyun Qiu\nSpeaker Institution : George Wash ington University\nNotes: *Refreshments served at 3:45pm LAST-MODIFIED:20230127T203043Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:POSTPONED to Monday 10/26: BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100331T190000Z DTEND:20100331T200000Z DTSTAMP:20260828T094430Z UID:7dr17j6au8dmju1gs742aqvdmo@google.com CREATED:20100325T131638Z DESCRIPTION:Title: Carrier Dynamics Investigation of a Quantum Cascade Lase r Using Femtosecond Mid-IR Pump-Probe Spectroscopy\n \nBy: Dr. Anthony M. J ohnson\n Director Center for Advanced Studies in Photonics Research (CASP R)\n Professor of Computer Science & Electrical Engineering\n Professor of Physics\n University of Maryland\, Baltimore County (UMBC)\n amj@um bc.edu\n \nAbstract:\nFemtosecond mid-IR pulses have been coupled into a ro om temperature 4.8m quantum cascade laser (QCL) to investigate the carrier dynamics. The 140fs duration mid-IR source was tuned to a wavelength of 4.8 m\, resonant with the QCL lasing transition\, and had a repetition rate of 250 kHz. The QCL was pulsed biased at 250 kHz and synchronized to the fs mi d-IR source. In the pump-probe technique\, a strong pump beam is coupled in to the QCL to study the carrier gain dynamics. A second weaker probe beam i s used to monitor the evolution of the change of gain as a function of the delay between probe and pump this pump-probe signal is directly related to the occupation probability of the carriers in the intersubband level. This signal provides information about the transport of electrons through the in jector and active regions of the QCL ultimately giving us information about the transit time of electrons across the device. We have measured the time -resolved pump-probe transmission of the QCL as a function of applied bias to reveal its affect on the gain recovery lifetime. Depending upon the QCL bias level\, we have measured gain recovery times as short as 200 fs and as long as 3 ps\, consistent with electron transport within the QCL. LAST-MODIFIED:20230127T203828Z LOCATION: Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130304T173000Z DTEND:20130304T183000Z DTSTAMP:20260828T094430Z UID:1f0ormb9eadqh3231hp2dag6n4@google.com CREATED:20130116T180157Z DESCRIPTION:Title: Defect Centers in Diamond for Quantum Applications: Pros pects & Problems - See more at: http://jqi.umd.edu/events/20130304/defect-c enters-diamond-quantum-applications-prospects-problems#sthash.kypzpwfx.dpuf \nSpeaker: Oliver Benson\, Humboldt University\, Berlin\nDefect centers in diamonds have been studied extensively in the last years [1]. They represe nt single photon sources with stable operation even at room temperature. Ad ditionally\, their spin state provides a long decoherence time and can be c ontrolled and read-out optically.\nIn this talk we focus on nitrogen vacanc y (NV) centers in nanocrystalline diamond. First\, we introduce basic prope rties of nanodiamonds and introduce a method to assemble fundamental nanoph otonic devices [2]. Then\, we report on a novel material platform based on direct laser writing in polymers which allows for fabrication of arbitrary three-dimensional quantum photonic structures [3].\nIn a second part of the talk we discuss decoherence of the electronic states in NV centers\, which is crucial for possible applications in quantum information processing [4] . Finally\, we show how a scanning probe can be functionalized with a nanod iamond to perform three-dimensional lifetime imaging with a single quantum emitter.\n\n[1] F. Jelezko\, and J. Wrachtrup\, Phys. Stat. Sol. A 203\, 32 07 (2006)\; I. Aharonovich\, A. D. Greentree and S. Prawer\, Nature Phys. 5 \, 397 (2011).\n[2] O. Benson\, Nature 480\, 193 (2011).\n[3] A. W. Schell\ , et al.\, arXiv:1209.2036\n[4] J. Wolters et al.\, Phys. Rev. Lett. 110\, 027401 (2013)\; J. Wolters\, et al.\, arXiv:1301.4544\n\n- See more at: htt p://jqi.umd.edu/events/20130304/defect-centers-diamond-quantum-applications -prospects-problems#sthash.kypzpwfx.dpuf LAST-MODIFIED:20230127T203837Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Oliver Benson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101116T210000Z DTEND:20101116T220000Z DTSTAMP:20260828T094430Z UID:032sjl4t676jagn5bh7mmajhj8@google.com CREATED:20100825T175404Z DESCRIPTION:Speaker: Bill Dorland\, University of Maryland\nTitle: The End of the Oil Economy LAST-MODIFIED:20230127T203450Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Scholar Teacher Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120131T120000 DTEND;TZID=America/New_York:20120131T130000 DTSTAMP:20260828T094430Z UID:aup3qs4q9j4cektnigdh623aa8@google.com RECURRENCE-ID;TZID=America/New_York:20120131T120000 CREATED:20120119T153520Z DESCRIPTION:Speaker: Dr. Marina S. Leite\nCNST\, National Institute for Sta ndard and Technologies \nTitle: A New Paradigm for > 50% Photovoltaic Effic iencies LAST-MODIFIED:20230127T203454Z LOCATION:Large Conference Room (1207)\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221005T140000Z DTEND:20221005T151500Z DTSTAMP:20260828T094430Z UID:72k21fgjjlmddl3f4i19u2du1v@google.com CREATED:20220922T170331Z DESCRIPTION:Sam \;Gralla&n bsp\;from the University of Arizona (formerly\, an Einstein postdoctoral fe llow at UMD) is visiting \;UMD the week of Oct 3. He will be giving the inaugural Misner Lecture in Gravitational Physics titled "Blac k Holes: Seeing the Unseeable" \;on October 4th\, 4-5pm.

      https://science. umd.edu/events/misner-2022.html

      Sam has also kindly agree d to give a set of more technical lectures titled "Minicourse on Black Hole Imaging".


      This set of three lectures is aimed at students and researchers looking to learn more about black hole imaging. \; They ass ume a working knowledge of physics at the advanced undergraduate level\, bu t are otherwise agnostic to background. \; I do not assume any knowledg e of general relativity\, but relativists will find useful information in f ootnotes and appendices [in the lecture notes that will be made available].
      Lecture 1: Monday\, October 3\, 11:00-12:15 in PSC 3150& nbsp\; (coffee and light snacks will be provided)

       \;  \; &n bsp\; \;Theory: Observational appearance of sources near black holes


      Lecture 2: Wednesday\, October 5\, 10:00-11:15 in PSC 31 50 \; (coffee and light snacks will be provided)

       \; &nb sp\;  \; \;Experiment: Interferometry and the EHT measurements


      Lecture 3: Friday\, October 7\, 12:00-1:15 in PSC 2 136 \; (sandwiches\, etc. will be provided)

       \;  \;  \; \;The Future: Photon ring and precision gravity

      S ome questions I hope to answer (or lead you to your own answers!):
      * How should we interpret the famous "black hole image"?
      * What do the measur ements teach us about accretion or gravity?
      * What will we learn with fu ture measurements?
       LAST-MODIFIED:20220930T235236Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Minicourse on Black Hole Imaging TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120509T181500Z DTEND:20120509T191500Z DTSTAMP:20260828T094430Z UID:nn6kqgt9rittv4gm2f984r4mrc@google.com CREATED:20120330T162721Z DESCRIPTION:SPEAKER: Yong-Zhong Qian - Univ of Minnesota\, Tate Lab\, Minn eapolis\nTITLE: Collective Oscillations of Supernova Neutrinos\nAB STRACT: The proto-neutron star produced in a supernova emits powerful flux es of neutrinos and antineutrinos of all three flavors for approximately 10 seconds. Immediately outside the proto-neutron star\, the number density o f neutrinos is so high that forward scattering among themselves must be tak en into account in order to treat their flavor evolution on their way out o f the supernova. This gives rise to novel collective phenomena of neutrino flavor oscillations that are sensitive to the yet-unknown hierarchy of neut rino masses. Results from numerical simulations of collective neutrino osci llations in realistic supernova environments will be presented. The underly ing physics will be illustrated with simple models. The potential of using supernova neutrino signals to determine the neutrino mass hierarchy will be discussed. LAST-MODIFIED:20230127T203619Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221031T180000Z DTEND:20221031T190000Z DTSTAMP:20260828T094430Z UID:2u66n3q76un2btqtgi25h0ma1c@google.com CREATED:20221031T152928Z DESCRIPTION:PhD Defense

      Speaker: Ji Lie\, UMCP

      Advisor: Dr. P eter Nemes\, UMCP

      Title: \;Next-generation Mass Spectrometry with Multi-omics fo r Discoveries in Cell and Neurodevelopmental Biology


      Abstract: \;Understanding tissue f ormation advances our understanding of the causes of disease and the obtain ed knowledge can be potentially applied to develop personalized interventio ns. However\, to explore the underlying mechanisms that govern tissue forma tion\, there is a high and unmet need to develop new technologies to charac terize different types of biomolecules from early-stage embryonic precursor cells and their descendent cells during development. This dissertation dis cusses new technological advancements to facilitate multi-omic (proteomic a nd metabolomic) analysis to explore cell-to-cell differences and uncover me chanisms underlying tissue formation. The work presented herein illustrates the development of in vivo microsampling and single-cell mass spectrometry (MS) to uncover cell heterogeneity among embryonic cells. Additionally\, t his dissertation work studies the biological role of metabolites in cell fa te determination by exploring the mechanisms underlying metabolite-induced cell fate change. Moreover\, this work introduces a novel technique called MagCar developed to track and isolate tissue-specific cells at later stages \, which enables studying temporal molecular changes to gain new informatio n about tissue formation. LAST-MODIFIED:20221031T152943Z LOCATION:A.V. Williams Building\, Room 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081020T163000Z DTEND:20081020T173000Z DTSTAMP:20260828T094430Z UID:kt2u2g03ldrip8se4ajelpi23k@google.com CREATED:20080912T182423Z DESCRIPTION:Speaker:Paul Julienne\, NIST\nTitle:"Ultracold polar molecules in gases and lattices"\n LAST-MODIFIED:20230127T203455Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221024T200000Z DTEND:20221024T210000Z DTSTAMP:20260828T094430Z UID:3k471d1sbk0uoer8fjbv0kjj3o@google.com CREATED:20221021T182739Z DESCRIPTION:Speaker: Ido Kaminer\, Technion - Israel Institute of Technolog y LAST-MODIFIED:20221021T182739Z LOCATION:ATL 2117 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar Student Tea TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090429T193000Z DTEND:20090429T203000Z DTSTAMP:20260828T094430Z UID:bbt43noscdhivlk3e76ljd7fqo@google.com CREATED:20090410T143414Z DESCRIPTION:Title: Protecting the Public: Alcohol Beverage Regulation via Analytical Testing \nSpeaker: Abdul Mabud\, Ph.D.\, Director\, Scientific Services Division\, Alcohol and Tobacco Tax and Trade Bureau (TTB) LAST-MODIFIED:20230127T203337Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130411T190000Z DTEND:20130411T200000Z DTSTAMP:20260828T094430Z UID:rndrsangijnnjabj4sq10mvlfg@google.com CREATED:20130405T143934Z DESCRIPTION:Speaker: Tom Snitch\nTitle: Saving Rhinos with Math\, Drones an d Satellites LAST-MODIFIED:20230127T203345Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BOV Entrepreneurship Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111213T160000Z DTEND:20111213T173000Z DTSTAMP:20260828T094430Z UID:vcbps3r6a1r7nfp5u9kk64hdc0@google.com CREATED:20111208T144626Z DESCRIPTION:Title : Quantum Monte Carlo Studies of Correlated Electrons on Honeycomb Lattice and Interacting Topological Insulator\n\nSpeaker Name: Zi Yang Meng\n\nSpeaker Institution : Institut fuer Theoretische Physik III\, Universitaet Stuttgart\, Germany\; Center for Computation and Technology\, Louisiana State University\, USA\n\nNotes: Flyer available at http://www.p hysics.umd.edu/cmtc/seminars.html\n\nAbstract : At sufficiently low tempera tures\, condensed-matter systems tend to develop order. An notable exceptio n to this behavior is quantum spin-liquids\, where fluctuations prevent tra nsition to an ordered state down to the lowest temperatures. Using large-sc ale quantum Monte Carlo simulations\, we found a quantum spin-liquid phase of correlated electrons on the honeycomb lattice\, this spin-liquid emerges between the state described by massless Dirac fermions and an antiferromag netically ordered Mott insulator\, and is found to be a short-range resonat ing valence bond liquid\, akin to the one proposed for high temperature sup erconductors. This was the first unbiased determination of a RVB-liquid in an electronic system [1].\n\n\n\nWe extend our quantum Monte Carlo study to the Kane-Mele-Hubbard model on the honeycomb lattice. We mapped out the ph ase diagram at half-filling and determined the phase boundaries between the quantum spin liquid\, the topological (quantum spin-Hall) insulator and th e antiferromagnetic Mott insulator. At finite Hubbard interaction\, the top ological insulator is adiabatically connected to the ground state of the Ka ne-Mele model. The transition from the topological insulator to the antifer romagnetic Mott insulator at large Hubbard U is in the universality class o f the three-dimensional XY model. Our numerical data further suggest that t he spin liquid to topological insulator and spin liquid to Mott insulator t ransitions are both continuous. The interaction effect on the helical edge state has also been addressed [2].\n LAST-MODIFIED:20230127T203145Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081024T170000Z DTEND:20081024T180000Z DTSTAMP:20260828T094430Z UID:uburjs70r3aaccelm65pbc6iig@google.com CREATED:20081022T150810Z DESCRIPTION:Title: “Nano-Chessboard Superlattices Formed by Spontaneous Pha se Separation in Oxides”\nSpeaker: Professor Peter K. Davies\, University o f Pennsylvania LAST-MODIFIED:20230127T203447Z LOCATION:Chemical and Nuclear Engineering Building\, Rm. 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091028T210000Z DTEND:20091028T220000Z DTSTAMP:20260828T094430Z UID:qekortmqh19r2j2k4h3qjtv9g0@google.com CREATED:20091026T124541Z DESCRIPTION:Wednesday\, October 28\, 5:00p.m.\n\nSpeaker: Christopher Monro e\, Bice Zorn Professor\, Department of Physics\, University of Maryland\, College Park\n \nTitle: Quantum Information Science\n \nABSTRACT: The twen tieth century is commonly described as the information era\, with the devel opment of the digital computer following Turing's and Shannon's formal defi nitions of universal computation and information. Information technology so on followed\, from vacuum tubes to solid state electronics and today's VLSI circuits. But there was another scientific revolution in the 20th\ncentury : quantum mechanics. This field emerged as an essential model of the behav ior of atomic and subatomic matter\, but it entailed radical foundations\, such as inherent uncertainty and the essential role of the observer in quan tum measurement. These strange features were largely treated as curiositie s in much of the 20th century\, and most scientists simply ignored them (wi th Einstein a notable exception). Now at the dawn of the 21st century\, we are seeing a second quantum revolution\, as quantum mechanics is being com bined with information theory in the new field of quantum information scien ce. But now\, the bizarre features of quantum mechanics -- uncertainty\, e ntanglement\, and measurement -- are embraced in order to perform tasks tha t are impossible using conventional computers and potentially transform how we process and store information. This lecture will survey the new discip line of quantum information science\, describing how it has shaped our view of quantum foundations\, listing its potential applications and limitation s\, and summarizing state-of-the-art quantum hardware.\n\nNotes: A receptio n will precede the lecture at 4:30 in the lobby of the CSIC Building LAST-MODIFIED:20230127T203550Z LOCATION:Computer Science Instructional Center (Bldg. 406)\, Room 1115 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Control and Dynamical Systems Distinguished Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100224T200000Z DTEND:20100224T210000Z DTSTAMP:20260828T094430Z UID:hed646dvvfsna4ump721i2o1n4@google.com CREATED:20100218T210119Z DESCRIPTION:Title: The Power of True Time Domain Correlation Receiver Using RF-Photonics\n \nBy: Dr. Weimin Zhou\n Army Research Laboratory\n \nAb stract:\nMost RF systems process signals in the frequency domain. Modern Ra dar and communication systems use short pulses for both transmit and receiv e\, therefore\, the RF receivers signal integration time is limited by the pulse width and number of pulse received. If a single pulse or frequency ho pping is employed\, current detection systems will lose its sensitivity and resolution. At ARL\, we are developing a true-time domain RF-Photonic corr elation receiver using an optical fiber recirculation loop circuit. In such a receiver\, a single pulse can be sampled thousands of times longer than it pulse width\, therefore increasing the sensitivity and frequency resolut ion by thousands of times. We used this receiver in an auto-correlation con figuration to build a RF channelizer/spectrum analyzer for proof-of-princip le demonstrations. This type of channelizer has the capability to channeliz e a single short input RF pulse signal into thousands of frequency channels and the capability to tune the center frequency and total bandwidth for a very wide frequency range (4KHz-40GHz). I will show some of the preliminary experimental results and discuss the advantage of this technique compared with current digital technology. LAST-MODIFIED:20230127T202949Z LOCATION: Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, Colleg e Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221122T180000Z DTEND:20221122T190000Z DTSTAMP:20260828T094430Z UID:6cbocq9hv8b6phj5ktg7i4fabg@google.com CREATED:20220920T114606Z LAST-MODIFIED:20220921T144052Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR - HAPPY THANKSGIV ING BREAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110425T163000Z DTEND:20110425T173000Z DTSTAMP:20260828T094430Z UID:9c90ta3dtc9rpp0t809u3h30es@google.com CLASS:PUBLIC CREATED:20110303T191136Z DESCRIPTION:Relaxation Effects in Cooper Pair Box Qubits\nBen Palmer*\nLabo ratory for Physical Sciences\, College Park\, MD 20740\n\nI will describe a nd contrast two different sets of measurements we have made on the lifetime of the excited state of a charge qubit. In our case\, the charge qubit is a superconducting Al/AlOx/Al single-Cooper-pair box that is cooled to 20 mK . Using a dissipative measurement and decoupling our qubit from charge nois e\, we were able to obtain lifetimes of a few microseconds. This measuremen t technique allowed us to use the Cooper-pair box as a “quantum spectrum an alyzer” and showed that anomalous charge fluctuators in the Josephson tunne l junction can cause the lifetime of the qubit to decrease to a few hundred nanoseconds.† More recently\, we have used a circuit QED scheme to dispers ively measure the lifetime of a charge qubit. Using this scheme we have fou nd a strong correlation between the lifetime of the qubit and the inverse o f the coupling to the dissipative environment. At the smallest coupling\, w e have measured a maximum lifetime of 200 microseconds which represents an order of magnitude improvement from previous results.‡ This long lifetime p laces a bound in the dielectric loss of the Josephson junction barrier less than tan  < 10-7. \n\n† Z. Kim et al.\, “Anomalous avoided level crossing s in a Cooper-pair box spectrum\,” Physical Review B 78\, 144506 (2008).\n‡ Z. Kim et al.\, “Decoupling a Cooper-pair box to enhance the lifetime to 0.2 ms\,” arXiv:1101.4692v1 (2011).\n\n* In collaboration with Zaeill Kim\, 1\,2\,4 Baladitya Suri\,1\,2 Vitaley Zaretskey\,1\,2 Sergey Novikov\,1\,2 A ri Mizel\,1 Kevin Osborn\,1 Matt Shaw\,3 Pierre Echternach\,3 and Fred Well stood.2\,4\n1 Laboratory for Physical Sciences\, College Park\, MD 20740\n2 Department of Physics\, University of Maryland\, College Park\, MD 20742\n 3 Jet Propulsion Laboratory\, California Institute of Technology\, Pasadena \, CA 91109\n4 Joint Quantum Institute and Center for Nanophysics and Advan ced Materials\, College Park\, MD 20742\n\n LAST-MODIFIED:20230127T203525Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100511T160000 DTEND;TZID=America/New_York:20100511T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100511T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Serge Haroche\, College de France\nTitle: "Photo ns 'in vivo': manipulating and measuring light in a cavity\nwithout destroy ing it"\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090212T190000Z DTEND:20090212T203000Z DTSTAMP:20260828T094430Z UID:i4kg27f6qvc93954m5r6gmrvpc@google.com CREATED:20090202T174055Z DESCRIPTION:Title: Atomistic Calculations on Nanostructured Materials\nSpea ker: Professor Sondan Durukanoglu\, MIT & Istanbul Technical University\n LAST-MODIFIED:20230127T203533Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120301T190000Z DTEND:20120301T200000Z DTSTAMP:20260828T094430Z UID:urm448mq40jt7nagdas9int8eo@google.com CREATED:20120209T193148Z DESCRIPTION:Title : Electroweak Physics with the ATLAS detector - From Dete ctor Commissioning to Constraining the Standard Model\nSpeaker Name: Albert o Belloni\nSpeaker Institution : Harvard University\nAbstract : This talk p resents the most recent measurements of electroweak physics at ATLAS\, with focus on W and WW physics. The current results\, already limited by system atic uncertainties\, provide important constraints on parton-distribution-f unction fits and a unique opportunity to study electroweak interactions at an energy scale\nunprecedented at colliders. A view on the current status a nd prospects for future measurements of electroweak physics\, including\nH- >WW\, is also presented. LAST-MODIFIED:20230127T203410Z LOCATION:4102 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221014T173000Z DTEND:20221014T190000Z DTSTAMP:20260828T094430Z UID:755n7bppg00rnomngvf43kqb0t@google.com CREATED:20220812T140113Z DESCRIPTION:*Special Joint UMD/ Cornell Seminar*

      S eminar will be streamed live via zoom

      Speaker: Zhengkang Zhang\, UC Santa Barbara

      Will be preceded by virtual lunch at 12:30pm.

      T itle: Magic Zeroes and Hidden Symmetries

       \;Abstract:  \; Se lection rules arising from accidental or broken symmetries may be sufficien tly obscure that their agency is hidden\, leading to the appearance of “mag ic zeroes” – quantities that are suppressed without apparent recourse to a symmetry explanation. Magic zeroes and their corresponding hidden symmetrie s may shed new light on parametric hierarchies in the Standard Model and be yond. We identify the hidden symmetry responsible for a recently-discovered magic zero\, the vanishing of the putative leading contribution to the ano malous dipole moments of the muon upon integrating out weak doublet and sin glet vector-like fermions. Some of the tools involved – spurion analysis le veraging discrete symmetries of the free theory\, field redefinitions\, spe ctator fields\, and non-supersymmetric non-renormalization theorems – may p rove useful in the hunt for new magic zeroes and their hidden symmetries.
      For zoom link please email mknouse@u md.edu       LAST-MODIFIED:20221014T153018Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Zhengkang Zhang\, UC Santa Barbara TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121015T160000 DTEND;TZID=America/New_York:20121015T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121015T160000 CREATED:20120904T140915Z DESCRIPTION:Title : A Single Molecule View of the Central Dogma in Yeast\n\ nSpeaker Name: Dan Larson\n\nSpeaker Institution : NIH\n LAST-MODIFIED:20230127T203255Z LOCATION:BIOSCIENCE RESEARCH BLDG 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221019T170000Z DTEND:20221019T180000Z DTSTAMP:20260828T094430Z UID:73g4stfblr3sqfceibqbfnqtqg@google.com CREATED:20221013T152522Z DESCRIPTION:Title:  From 1 to K: Improved Certifiable Randomness
      Speaker :  Rushil Dandamudi (QuICS)
      Time:  Wednesday\, October 19\, 2022 - 1:00p m
      Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

      In a previous talk we s aw that Brakerski et al. [1] used the hardness of the Learning with Errors (LWE) problem to not only construct an interactive Proof of Quantumness but also certifiably generate a random bit.

      For this talk\, I will revi ew Mahdadev et al. [2] — an improvement on the former that generates Ω(n) r andom bits using only O(n) bits of communication. My main goal is to walk t hrough why they first design for a quantum verifier and how they eliminate that dependency. After explaining their intuition\, I will dive deeper and prove leakage resilience using a smaller instance of the LWE problem.
      References:

      [1] Brakerski\, Z.\, Christiano\, P.\, Mahadev\, U.\, Vazirani\, U.\, &\; Vidick\, T. (2018). A Cryptographic Test of Quantumn ess and Certifiable Randomness from a Single Quantum Device. https://doi.org/10.48550/arXiv.1804.00640
      [2] Mahadev\, U.\, Vazirani\, U.\, &\; Vidick\, T. (2022). Efficie nt Certifiable Randomness from a Single Quantum Device. https://doi.org/10.48550/arXiv.2204.11353 LAST-MODIFIED:20221013T152522Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Rushil Dandamudi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100407T193000Z DTEND:20100407T203000Z DTSTAMP:20260828T094430Z UID:m8eru48a4k3kvb9gc8r64u3k2k@google.com CREATED:20100401T165021Z DESCRIPTION:Title: Adiabatic quantum optimization fails for random instance s of NP-complete problems\n \nBy: Hari Krovi\n University of Connecticut\ n \nAbstract:\nAdiabatic quantum optimization has attracted a lot of attent ion because small scale simulations gave hope that it could solve NP-comple te problems efficiently. Later\, negative results proved the existence of s pecifically designed hard instances where adiabatic optimization requires e xponential time. These hard instances usually lie far from the satisfiabili ty threshold of random instances of NP-complete problems and this is regime where classical solvers are inefficient. Thus\, it is important to underst and whether adiabatic quantum optimization is efficient in this regime. Her e\, we will show that because of a phenomenon similar to Anderson localizat ion\, an exponentially small eigenvalue gap appears in the spectrum of the adiabatic Hamiltonian for large random instances\, very close to the end of the algorithm. This implies\, unfortunately\, that adiabatic quantum optim ization fails for these instances by getting stuck in a local minimum\, unl ess the computation is exponentially long. LAST-MODIFIED:20230127T203841Z LOCATION: 8050 Greenmead Dr.\, College Park\, MD 20740 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120426T173000Z DTEND:20120426T180000Z DTSTAMP:20260828T094430Z UID:af0aube90bb0ne39oe4npcr5fs@google.com CREATED:20120118T182913Z LAST-MODIFIED:20230127T203406Z LOCATION:Rm 1305 (the new Toll Rm) Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120405T173000Z DTEND:20120405T180000Z DTSTAMP:20260828T094430Z UID:gnbcfdbaijtrtt7e3ttamv6tng@google.com CREATED:20120118T182526Z LAST-MODIFIED:20230127T203554Z LOCATION:Rm 1305 (the new Toll Rm) Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091207T200000Z DTEND:20091207T210000Z DTSTAMP:20260828T094430Z UID:mii42mnsmdmc0b6bk0g6s25q84@google.com CREATED:20091201T145632Z DESCRIPTION:[Title] "TeV Scale Inverse Seesaw in SO(10) and its Phenomenolo gy" \n[Speaker] Bhupal Dev\n[Institution] University of Maryland\n[Abstract ] We show that a TeV scale inverse seesaw mechanism for neutrino masses can be realized within the framework of a supersymmetric SO(10) model consiste nt with gauge coupling unification and observed neutrino masses and mixings . The model predicts observable non-unitarity effects in the leptonic secto r. It also puts limits on various proton decay modes.\n LAST-MODIFIED:20230127T203341Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090925T183000Z DTEND:20090925T193000Z DTSTAMP:20260828T094430Z UID:mkq9m4fohaf4urf4l9aqp448h0@google.com CREATED:20090923T145013Z DESCRIPTION:Title: “Architectures\, Abstractions\, and Algorithms for Large Teams of Robots”\n\nSpeaker: Dr. Vijay Kumar\, Professor\, School of Engin eering and Applied Sciences\, University of Pennsylvania\n\nABSTRACT:\n\nNe tworked robots represent the convergence of robotics\, sensor networks and mobile ad-hoc networks\, with many applications and a growing market projec ted to grow to $200B in the next five years. This talk will address some fu ndamental problems and practical challenges underlying the deployment of la rge numbers of autonomously functioning robots. The central problem is the so-called inverse problem of deriving individual robot behaviors for a desi red group behavior. There are numerous examples of group behavior in biolog y at different length scales that lend themselves to quantitative modeling and control providing insight for the synthesis of collective behaviors for engineered systems. I will discuss several examples and present a methodol ogy for modeling and analyzing such collective behaviors. I will then descr ibe our approach to developing architectures\, abstractions and algorithms for the control of large networks of aerial and ground robots.\n LAST-MODIFIED:20230127T203219Z LOCATION:CSIC 1115 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:The Booz Allen Hamilton Distinguished Colloquium in Electrical and Computer Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110131T233000Z DTEND:20110201T003000Z DTSTAMP:20260828T094430Z UID:obcatph8too1m9cm83m5er2klg@google.com CREATED:20110118T155724Z DESCRIPTION:MaterialsDC Presentation and Reception: Latiff on Strategic Mat erials (This event has no end time in the Engineering Calendar. An hour lo ng event duration has been set to work with Google Calendar.) LAST-MODIFIED:20230127T203311Z LOCATION:Kay Boardroom\, Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MaterialsDC Presentation and Reception: Latiff on Strategic Materia ls TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100401T140000 DTEND;TZID=America/New_York:20100401T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20100513T180000Z;BYDAY=TH DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com CREATED:20100308T142616Z DESCRIPTION:[Speaker] Luis Balicas\n[Institution] NHMFL-Florida State Univ ersity\n[Title] TBA LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100510T201500Z DTEND:20100510T213000Z DTSTAMP:20260828T094430Z UID:fbl30po04l0imqjagnrkiu4avk@google.com CREATED:20100408T132409Z DESCRIPTION:Title : Temperature Responses to Spectral Solar Variability on Decadal Time Scales\nSpeaker Name: Robert F. Cahalan\nSpeaker Institution : Head of NASA/Goddard’s Climate and Radiation Branch\nAbstract : Results fr om the Solar Radiation and Climate Experiment (SORCE) and its implications for Earth’s energy budget and climate are summarized. We briefly describe a proposed new approach to determine the pre-satellite history of Total Sola r Irradiance (TSI) from lunar borehole observations. Then we conider two sc enarios of decadal solar spectral irradiance variations – conventional in-p hase variations\, for which the spectral shape remains unchanged\, and out- of-phase variations that are based on SORCE-SIM observations. These scenari os are used to force a tropical one-dimensional radiative-convective model\ , and the global three-dimensional GISS modelE. Both scenarios and models g ive maximum temperature responses in the upper stratosphere\, decreasing to the surface. Upper stratospheric peak-to-peak responses to out-of-phase fo rcing are about a factor of 5 larger than responses to in-phase forcing. St ratospheric responses are in-phase with TSI and UV variations\, and resembl e HALOE observed 11-year temperature variations\, while responses to conven tional spectral forcing are not consistent with the HALOE observations. Som e of these results appear in: Cahalan et al\, 2010: Geophys. Res. Lett.\, 3 7\, L07705\, doi:10.1029/2009GL041898.\n LAST-MODIFIED:20230127T203332Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221130T210000Z DTEND:20221130T220000Z DTSTAMP:20260828T094430Z UID:466th1emclfl8hrpul7hiscbr6@google.com CREATED:20221128T192855Z DESCRIPTION:\nWednesday\, November 30:\n4:00-5:00 in PSC 3150\nSpeaker: Eri k Blaufuss (UMD)\nTitle: "Recent Point Source Search Results from IceCube" LAST-MODIFIED:20221128T193022Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:HEP / Particle Astrophysics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081106T210000Z DTEND:20081106T220000Z DTSTAMP:20260828T094430Z UID:3266p34m89mqmu2v76kq5qqocc@google.com CREATED:20081106T131642Z DESCRIPTION:Speaker: Aron Wall\, University of Maryland\nTitle: Towards a p roof of the generalized second law?\n LAST-MODIFIED:20230127T203059Z LOCATION:Physics Room 4102 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081119T210000Z DTEND:20081119T223000Z DTSTAMP:20260828T094430Z UID:ukvrs4fvk96esbe7spkvm14lj8@google.com CREATED:20081008T172825Z DESCRIPTION:Title: Inclusive Scattering from Nuclei at x > 1 and High Q^2 w ith a 6 GeV beam\nSpeaker: Nadia Fomin\, University of Tennessee LAST-MODIFIED:20230127T203157Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN/ENP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090312T150000Z DTEND:20090312T160000Z DTSTAMP:20260828T094430Z UID:3nneiv20h5fag23bn4f583l6q8@google.com CREATED:20090309T142625Z DESCRIPTION:Title: Program Priorities and New Challenges for the Computer & Information Science & Engineering Directorate \nSpeaker: Dr. Jeannette Win g\, assistant director for Computer & Information Science and Engineering ( CISE) at NSF\nMore Information: CISE supports investigator initiated resear ch in all areas of computer and\ninformation science and engineering\, help s develop and maintain cutting-edge\nnational computing and information inf rastructure for research and education\ngenerally\, and contributes to the education and training of the next\ngeneration of computer scientists and e ngineers. \n \nCISE is organized in three divisions: the Division of Comput ing &\nCommunication Foundations (CCF)\; the Division of Computer and Netwo rk\nSystems (CNS)\; and the Division of Information and Intelligent Systems \n(IIS). \n\nPlease RSVP TO vpr@umd.edu by March 9\, 2009. Space is Limited .\nIf you have questions\, please contact Anne Geronimo at geronimo@umd.edu or\nX54178\n LAST-MODIFIED:20230127T203228Z LOCATION:Juan Ramon Jimenez Room\, Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Research Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091016T170000Z DTEND:20091016T180000Z DTSTAMP:20260828T094430Z UID:ngf1nqrhvhfhq5kujpcp79a6nc@google.com CREATED:20091012T131102Z DESCRIPTION:Title : Plasmon Resonances in Nanoparticles Speaker Name: Profe ssor Isaak Mayergoyz Speaker Institution : University of Maryland Abstract : Plasmon resonances in nanoparticles have been the focus of considerable r esearch lately due to their numerous technological applications. In the tal k\, the eigen-mode approach to the description of plasmon resonances in na noparticles will be presented. The general properties of plasmon spectrum a nd plasmon resonance modes will be discussed along with such issues as tuni ng and controllability of plasmon resonances\, coupling of specific plasmon modes to incident optical radiation and time dynamics of plasmon modes exc itation and dephasing. Finally\, possible applications of plasmon resonance s to the design of all-optical nano-transistors\, to thermally assisted mag netic data storage as well as to all-optical magnetic recording will be out lined. LAST-MODIFIED:20230127T203501Z LOCATION:2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101110T203000Z DTEND:20101110T213000Z DTSTAMP:20260828T094430Z UID:3gt1su0odqnuks9rar6t9t14js@google.com CREATED:20101105T171546Z DESCRIPTION:Title: Updating the OSMOSIS Optical HPC Switch\n\nAbstract: OSM OSIS is an optical packet switching interconnection network for high-perfor mance computing systems. It succeeded in demonstrating sustained high bandw idth (40Gbps)\, very low latency (~1 µs application to application)\, and c ost-effective scalability (to beyond 2048 ports). Delivered in 2006\, it wa s approximately 5 years ahead of its time in that the associated 40G line r ate infrastructure at the required level of integration to be cost effectiv e was not available. This talk will briefly review the switch architecture\ , update the levels of integration available today\, and discuss some of th e system level trade-offs appropriate for implementing such an all optical switch toda\n\n\n\nSpeaker: Dr. Richard R. Grzybowski\nResearch Director\nS ystems Engineering and Program Management\nScience & Technology\n LAST-MODIFIED:20230127T203012Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091026T163000Z DTEND:20091026T173000Z DTSTAMP:20260828T094430Z UID:o9fq7qb1f2mmto0vuac6vi3afs@google.com CREATED:20091008T134811Z DESCRIPTION:Title : Secret keys and random numbers from quantum non localit y Speaker Name: Serge Massar Speaker Institution : University of Brussels\, Belgium Abstract : Non local correlations are obtained when local measurem ents are carried out on entangled quantum particles\, leading to a violatio n of a Bell inequality. We discuss how such non local correlations shared c an be used to generate random numbers and secret keys. Using non locality a llows a higher degree of security than in the more traditional approaches t o quantum cryptography\, as it is no longer necessary to trust one's device s\, nor even to trust quantum mechanics. We will briefly present the first experimental realization of these proposals\, carried out at JQI/Maryland.\ n\n LAST-MODIFIED:20230127T203408Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090424T170000Z DTEND:20090424T180000Z DTSTAMP:20260828T094430Z UID:n5g1bdma4kt1i6tei3mffmpgts@google.com CREATED:20090420T182429Z DESCRIPTION:Title: Observing the Quantization of Zero Mass Carriers in Grap hene\nSpeaker: Dr. Joseph A. Stroscio\, National Institute of Standards and Technology LAST-MODIFIED:20230127T203244Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130125T160000Z DTEND:20130125T173000Z DTSTAMP:20260828T094430Z UID:sbsg46rnh7qa54tjosis4ohi78@google.com CREATED:20130115T143137Z DESCRIPTION:Title : Repeatedly driven systems\n\nSpeaker Name: Luca D'Aless io\n\nSpeaker Institution : Boston University\n\nAbstract : When we do work on a system\, we transfer energy. Repeatedly adding a small\namount of ene rgy to the system by a cyclic process can result in a large\nenergy transfe r and cause the system to undergo a phase transition. I will\nshow that: 1) when the driving is aperiodic the final energy distribution\nof the system displays two qualitatively different regimes with a\ncontinuous second ord er like transition between them. 2) When the driving\nis periodic new physi cs emerge and the system can go across a many-body\nlocalization transition in the energy space at the critical value of the\ndriving frequency. In th is talk I will present specific calculations to\nsupport these findings and I will show that the localization transition is\nrelated to the break down of the short time (Magnus) expansion for the\nevolution operator. LAST-MODIFIED:20230127T203616Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100422T183000Z DTEND:20100422T193000Z DTSTAMP:20260828T094430Z UID:5m6mhror4khqnps8ord4k1mo3o@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100319T131815Z DESCRIPTION:[speaker] Scott Field\n[Institution] Brown University\n[Title] "High-Order Accurate Modeling of Extreme Mass Ratio Binaries"\n[Abstract] I n the first half of the talk I will present a discontinuous Galerkin (dG) method for modeling an EMRB system in the context of blackhole perturbatio n theory. DG methods provide excellent phase resolution and a natural setti ng for the distributional solutions common in EMRB modeling. The constructi on of radiation boundary conditions will be covered\, and I will highlight a few results from our code. In the second half of the talk I will discuss the development of static junk solutions which arise from the specification of trivial initial data. An analytic form of these junk solutions are fou nd in terms of hypergeometric functions. I will conclude the talk by consid ering their impact on computed metric perturbations and waveforms\, and how to remove them by a simple modification of the source terms. LAST-MODIFIED:20230127T203734Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091210T190000Z DTEND:20091210T200000Z DTSTAMP:20260828T094430Z UID:sg2ehq2ce2f9led14368246upo@google.com CREATED:20091202T163824Z DESCRIPTION:[Title] Exciton-Plasmon Interactions in Hybrid Nanostructures\n [Speaker] Professor Alexander Govorov\n[Institution] Ohio University\n[Abst ract] Coulomb interaction between optically-excited nanocrystals and molecu les provides a very efficient mechanism of energy transfer. This transfer o f optical energy from one component to another can be utilized in many appl ications\, including sensing [1-2] and light-harvesting [3]. One particular type of nanostructures exhibiting efficient energy transfer incorporates m etal and\nsemiconductor nanocrystals [1-2\,4]. The interaction of excitons and plasmons in such structures leads to several effects: Energy transfer b etween nanoparticles (NPs)\, electromagnetic enhancement\, reduced exciton diffusion in nanowires (NWs)\, exciton energy shifts\, and interference [1- 2\,4\,5]. Recent experiments with NW-NP complexes [1] showed that the excit on - plasmon interaction can lead to a blue shift of excitonic emission. Th is blue shift can be used for bio-chemical sensing and comes from the combi nation of two effects - exciton diffusion along a NW and energy transfer. E xciton-plasmon interactions in metal-semiconductor structures have potentia l for detection of small amounts of molecules or semiconductor NPs. Accordi ng to theoretical studies [5]\, the exciton-plasmon interaction can give ri se to the interference effects\n(Fano-like asymmetric resonances and anti-r esonances). This interference effect greatly enhances a visibility of weak exciton signals coming from single molecules and NPs. Another type of hybri d structures studied by us involves NPs and photosynthetic molecules (react ion centers).\nReaction centers have an important functionality – charge se paration. Modeling of the artificial light-harvesting complexes suggests an interesting opportunity of enhanced photosynthetic activity [3]. Optical e nhancement in hybrid photosynthetic complexes comes from plasmon\nresonance s\, strong optical absorption by semiconductor NPs\, and energy transfer fr om NPs to reaction centers.\n[1] J. Lee\, P. Hernandez\, J. Lee\, A. Govoro v\, and N. Kotov\, Nature Materials 6\, 291 (2007).\n[2] J. Lee\, A. O. Gov orov\, and N. A. Kotov\, Angewandte Chemie 117\, 7605 (2005).\n[3] A. O. Go vorov and I. Carmeli\, Nano Lett. 7\, 620 (2007)\; A. O. Govorov\, Adv. Mat erials\, 20\,\n4330 (2008).\n[4] A. O. Govorov\, G. W. Bryant\, W. Zhang\, T. Skeini\, J. Lee\, N. A. Kotov\, J. M. Slocik\, and R.\nR. Naik\, Nano Le tters 6\, 984 (2006).\n[5] J.-Y. Yan\, W. Zhang\, S. Duan\, X.-G. Zhao\, an d A. O. Govorov\, Phys. Rev. B 77\, 165301\n(2008). LAST-MODIFIED:20230127T203039Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130122T110000 DTEND;TZID=America/New_York:20130122T123000 DTSTAMP:20260828T094430Z UID:ivuj1a6fv7mq2v13d0gd3gufok@google.com RECURRENCE-ID;TZID=America/New_York:20130122T110000 CREATED:20130115T142814Z DESCRIPTION:Title : Superconductivity of doped Weyl semimetals: finite-mome ntum pairing and electronic analogues of the 3He-A phase\n\nSpeaker Name: G il Young Cho\n\nSpeaker Institution : UC Berkeley\n\nAbstract : We study su perconducting states of doped inversion-symmetric Weyl semimetals. Specific ally\, we consider a lattice model realizing a Weyl\nsemimetal with an inve rsion symmetry and study the superconducting\ninstability in the presence o f a short-ranged attractive interaction. With\na phonon-mediated attractive interaction\, we find two competing states: a\nfully gapped finite-momentu m (FFLO) pairing state and a nodal even-parity\npairing state. We show that \, in a BCS-type approximation\, the\nfinite-momentum pairing state is ener getically favored over the usual\neven-parity paired state and is robust ag ainst weak disorder. Though\nenergetically unfavorable\, the even-parity pa iring state provides an\nelectronic analogue of the 3He-A phase in that the nodes of the\neven-parity state carry non-trivial winding numbers and ther efore support\na surface flat band. We also briefly discuss interesting bou nd states to\nthe half-quantum and full quantum vortices in FFLO state refe rence: GY Cho\, J Bardarson\, Y.-M. Lu\, and JE Moore\, PRB\, 86\, 214514\n (2012) (Editors' suggestion) LAST-MODIFIED:20230127T203325Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130419T170000Z DTEND:20130419T180000Z DTSTAMP:20260828T094430Z UID:b0niuh53setetrrhqd9tmfnatk@google.com CREATED:20130327T195816Z DESCRIPTION:Speaker: Jiunn-Wei Chen\nInstitution: National Taiwan Universit y\nTITLE: "Berry Monopole and Relativistic Chiral Kinetic Equation"\nABSTRA CT: We derive a relativistic chiral kinetic equation with manifest Lorentz covariance from Wigner functions of spin-1/2 massless fermions in a constan t background electromagnetic field. It contains vorticity terms and a 4-dim ensional Euclidean Berry monopole which gives axial anomaly. By integrating out the zero-th component of the 4-momentum p\, we reproduce the previous 3-dimensional results derived from the Hamiltonian approach\, together with the newly derived vorticity terms. This provides a unified interpretation of the chiral magnetic and vortical effects\, chiral anomaly\, Berry curvat ure\, and the Berry monopole in the framework of Wigner functions. LAST-MODIFIED:20230127T203212Z LOCATION:2202 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101130T210000Z DTEND:20101130T220000Z DTSTAMP:20260828T094430Z UID:7vsc758d0kogdbl2obuka6f1h4@google.com CREATED:20100825T175525Z DESCRIPTION:Speaker: Neil Zimmerman\, National Institute of Standards and T echnology\nTitle: What is an Electron in a Metal\, When Surrounded by 10^23 Others? LAST-MODIFIED:20230127T203035Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100308T213000Z DTEND:20100308T223000Z DTSTAMP:20260828T094430Z UID:hahu3booe5gp1tqmv1j93qc4e8@google.com CREATED:20100223T153229Z DESCRIPTION:Title : Energetic particle activity at 1 AU during the current Solar Minimum\nSpeaker Name: Glenn Mason\nSpeaker Institution : Johns Hopki ns University Applied Physics Laboratory\nAbstract : The current solar mini mum is unprecedented since the start of space age with sunspot count and si milar measures of solar activity reaching low levels not seen for about a c entury. Although the last significant solar energetic particle events took place in December 2006\, nevertheless there has been a good deal of transie nt energetic particle activity at 1 AU. This activity has been observed fro m new vantage points with the twin STEREO spacecraft\, and the continued op eration of instruments on the Advanced Composition Explorer (ACE) mission. During this period\, high speed solar wind streams continued to generate Co rotating Interaction Regions (CIRs) with great regularity\, and at a signif icantly higher level than the previous solar minimum in 1996-97. This unexp ected development was caused by the nearly continuous presence of coronal h oles near the solar equator and may be related to the weak solar magnetic f ields at the poles during the current minimum. The combined capabilities of ACE and STEREO made it possible to characterize new features of CIRs since single events moved past the three spacecraft in sequence\, revealing a su rprising degree of variability. We will discuss these features of the 2007- 2010 solar minimum\, and will also comment on a couple of examples of small \, 3He-rich solar energetic particle events whose source regions could be i dentified without problems of source confusion generally present during act ive periods. These events lacked typical features such as type III radio bu rsts generally associated with impulsive events\, and may give new insights into possible acceleration mechanisms. (link)\n LAST-MODIFIED:20230127T203835Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221214T160000Z DTEND:20221214T170000Z DTSTAMP:20260828T094430Z UID:5660h3tf6p2paeoiv4ejl5st38@google.com CREATED:20221208T180110Z DESCRIPTION:Title:  Linear Growth of Complexity in Brownian Circuits
      Spe aker:  Gregory Bentsen (Brandeis University)
      Time:  Wednesday\, December 14\, 2022 - 11:00am
      Location:  ATL 3100A and Virtual Via Zoom: https://umd .zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09

      Gener ating randomness efficiently is a key capability in both classical and quan tum information processing applications. For example\, Haar-random quantum states serve as primitives for applications including quantum cryptography\ , quantum process tomography\, and randomized benchmarking. How quickly can these random states be generated? And how much randomness is really necess ary for any given application? In this talk\, I will address these question s in Brownian quantum circuit models\, which admit a large-N limit that can be solved exactly. Using path integrals methods I demonstrate that Brownia n quantum systems have circuit complexity that grows linearly with time. In particular\, I present a calculation of the kth Frame Potential in this mo del and show that it comes within ϵ of the Haar value after a time of order t∼kN+klogk+logϵ−1. This implies that the Brownian circuits come very close to a unitary k-design after a time of order t∼kN. These same Brownian circ uit models are also applicable to other salient problems in many-body dynam ics\, including measurement-induced phase transitions\, dissipative quantum state engineering\, and the design of new continuous-variable quantum erro r-correcting codes. I will conclude by reviewing some of these applications and suggesting some interesting future directions. LAST-MODIFIED:20221208T180110Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS-QuICS Special Seminar: Gregory Bentsen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090327T173000Z DTEND:20090327T190000Z DTSTAMP:20260828T094430Z UID:0702af8ldgr17t27lrdv1hml9s@google.com CREATED:20090312T193319Z DESCRIPTION:Title: Endless Universe\nSpeaker: Paul Steinhardt\, Princeton U niversity\nMore Information: The Abstract: An introductory discussion of th e inflationary and cyclic models of the universe\, including connections to observations past and future. LAST-MODIFIED:20230127T203911Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland Center for Fundamental Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111017T163000Z DTEND:20111017T173000Z DTSTAMP:20260828T094430Z UID:qln04aj6ndcjo7jm94gj6g16rc@google.com CREATED:20111003T133058Z DESCRIPTION:Speaker: Samuel J. Lomonaco\nInstitution: University of Maryl and Baltimore County\nTitle: Quantum knots and quantum braids: Their poss ible application to superfluid vortices and to topological quantum computin g in optical lattices.\nAbstract: In this talk\, we show how to reconstruct knot theory in such a way that it is intimately related to quantum physics . In particular\, we give a blueprint for creating a quantum system that h as the dynamic behavior of a closed knotted piece of rope moving in 3-space . Within this framework\, knot invariants become physically measurable qua ntum observables\, knot moves become unitary transformations\, with knot dy namics determined by Schroedinger’s equation. The same approach can also b e applied to the theory of braids. Toward the end of the talk\, we look at possible applications to superfluid vortices and to topological quantum co mputing in optical lattices.\n LAST-MODIFIED:20230127T203207Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Samuel Lomonaco TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090323T163000Z DTEND:20090323T173000Z DTSTAMP:20260828T094430Z UID:o1fiuv8usruqkcie4vtcv7uono@google.com CREATED:20090202T164213Z DESCRIPTION:Title: Coherence in Superconducting Charge Qubits\nSpeaker: Yos unobu Nakamura\, NEC Tsukuba LAST-MODIFIED:20230127T203219Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100423T170000Z DTEND:20100423T180000Z DTSTAMP:20260828T094430Z UID:nt48hs50lat9p30bqtehg41mks@google.com CREATED:20100416T140558Z DESCRIPTION:Title: EM and SEM of SOFC Materials and Related Systems\n\nSpea ker: C. Barry Carter\nHead\, Chemical\, Materials & Biomolecular Engineerin g\nUniversity of Connecticut\nGeneral Secretary\, the International Federat ion of Societies for Microscopy\nEditor-in-Chief\, Journal of Materials Sci ence\n\nAbstract: ansmission Electron Microscopy and Scanning Electron Micr oscopy can be combined to provide microstructural and chemical information that is essential if we are to understand how interfaces in the Ceramic Mat erials used in SOFCs control the properties of these materials. Only using these two tools can we identify the local crystallography and chemistry of the interfaces and learn about local bonding\, with near atomic resolution and relate these features to features at a more macroscopic scale. However\ , there is still a dearth of systematic studies\, especially using model ma terial systems: providing this type of information continues to be the emph asis of our research. The present talk will be illustrated by results from our programs on Ceria\, Barium Cerate\, and some zirconia-based materials. In passing\, I will also illustrate some of the potential pitfalls encounte red when using TEM to study interfaces\; these examples illustrate some of the challenges we must remember when interpreting images of Ceramic Materia ls in general\, and of interfaces in particular.\n\nThe talk will illustrat e current approaches we are exploring that use different Ceramic Materials systems\; we pay particular attention to solid-state reactions and utilize the growth of model thin films. Throughout the talk\, other characterizatio n techniques\, particularly AFM and VLM\, will be used to complement the in formation obtained in the TEM and SEM\; the FIB should also play a critical role in all future studies. The textbooks on Transmission Electron Microsc opy and Ceramic Materials will be mentioned frequently! \n\n LAST-MODIFIED:20230127T203239Z LOCATION:Room 2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T160000Z DTEND:20221208T170000Z DTSTAMP:20260828T094430Z UID:76esl94j520nre9lv02ge5jmgt@google.com CREATED:20220815T165617Z DESCRIPTION:Speaker: Dr. Christopher Sims\, NIST

      Title:&n bsp\;      Metrology Development Towards Optimizing Single -wall Carbon Nanotube Separations


      Abstract: \;      Full realization of the optica l\, thermal\, or electronic properties of specific single-wall carbon nanot ube (SWCNT) (n\,m) species requires the isolation of each specie from comme rcially synthesized mixtures\, which contain multiple individual species. A queous two-phase extraction (ATPE) is an effective\, yet still developing\, liquid-phase processing method for these isolations\, with control usually achieved by competing two or more surfactants against the nanotube surface . However\, evaluating SWCNT extraction conditions has previously required extensive empirical separation experiments. To overcome this barrier\, we r ecently advanced a fluorescence-based spectroscopy method for determining e xtraction conditions for specific (n\,m) species SWCNTs and their enantiome rs that does not rely on the performance of separations. This methodology a lso enables swifter investigation of complicating factors\, which are shown to strongly shift the amount of surfactant necessary to cause specific (n\ ,m) extractions. Finally\, analytical ultracentrifugation (AUC) measurement s are used to probe the surfactant layer compositions on the SWCNTs under e xtraction conditions. These results provide additional insight into the und erlying mechanisms behind ATPE-based SWCNT separations\, towards further de velopment and optimization of the ATPE method for isolating individual (n\, m) species and their handed enantiomers. LAST-MODIFIED:20221205T144144Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130405T170000Z DTEND:20130405T180000Z DTSTAMP:20260828T094430Z UID:b8ol2imbqbkviq1su32ntqkris@google.com CREATED:20130327T195137Z DESCRIPTION:Speaker: Xiangdong Ji\nInstitution: University of Maryland\nTit le: "Parton Physics on Euclidean Lattice"\nAbstract: I show that the parton physics related to correlations of quarks and gluons on the light-cone can be studied through the matrix elements of frame-dependent\, equal-time cor relators in\nthe infinite momentum limit. This observation allows practical calculations of parton properties on an Euclidean lattice. As an example\, I demonstrate how to recover the leading-twist\nquark distribution by boos ting an equal-time correlator to a large momentum. LAST-MODIFIED:20230127T203335Z LOCATION:2202 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091123T173000Z DTEND:20091123T183000Z DTSTAMP:20260828T094430Z UID:iitkh9mfp0hbb88ud5d5d72r70@google.com CREATED:20091008T134108Z DESCRIPTION:Title : Applied Hyperentanglement\nSpeaker Name: Paul Kwiat\nSp eaker Institution : University of Illinois Abstract : In addition to displa ying strong nonclassical correlations in polarization\, energy\, momentum a nd spatial mode\, photons from spontaneous downconversion may be entangled in multiple degrees of freedom simultaneously (“hyperentangled”). Such hype rentangled states reside in a much larger Hilbert space\, and enable new ca pabilities in quantum communication and metrology. For example\, hyperentan glement enables one to deterministically identify all four maximally entang led Bell states\, leading to improved quantum dense coding. I will discuss this results and it’s extensions\, in addition to another application\, th e remote preparation of entangled polarization/spatial-mode states. Specif ically\, by making a particular measurement on one photon of a hyperentangl ed pair (effectively a CNOT gate between polarization and spatial mode)\, A lice may remotely prepare Bob’s photon in entangled state of these two degr ees of freedom. One example is a ‘radial-polarization’! \n \n state\, in which the polarization of a light beam is everywhere radially directed. Suc h states have been shown to enable the largest possible longitudinal electr ic field component in the focal point of a lens\, as well as the most effic ient mode converter for light-atom coupling in free space. More generally\ , using these techniques\, a wide range of other complex entangled polariza tion-spatial modes may be remotely prepared.The remotely prepared photons w ere analyzed in two ways\, by quantum state tomography of the entire beam i n the spin-orbit basis\, and by direct tomography of the polarization state over the transverse spatial mode\, using a small scanning pinhole.\n\n LAST-MODIFIED:20230127T203827Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110428T113000 DTEND;TZID=America/New_York:20110428T123000 DTSTAMP:20260828T094430Z UID:tccpsv8eudbavhddlpmpkul6rk@google.com RECURRENCE-ID;TZID=America/New_York:20110428T113000 CREATED:20110317T150721Z DESCRIPTION:Topic: "Non-standard WIMP Dark Matter Detection"\nPaper Ref.: a rXiv:1003.5912\nPresenter: Kaustubh Agashe (UMD)\nAbstract: Abstract: Dark matter scenarios with non-standard detection signals will be discussed (par tly based on arXiv:1003.5912). For example\, it is possible to have two dif ferent photon lines resulting from annihilation of (single species) of dark matter or "boosted" dark matter in final state from such annihilation.\n\n .\n LAST-MODIFIED:20230127T203703Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100311T203000Z DTEND:20100311T213000Z DTSTAMP:20260828T094430Z UID:qgfvt8svo8uh5sal32ho0d81ds@google.com CREATED:20100301T170306Z DESCRIPTION:Title : Work\, Energy\, and Systems: Investigating student thi nking\nabout energy in the context of mechanics\nSpeaker Name: Beth Lindsey \nSpeaker Institution : Georgetown University\nAbstract. The first law of t hermodynamics states that doing work on an\notherwise isolated system will cause its energy to change. In order\nto apply this law correctly\, studen ts need to be able to calculate the\nwork done on a deformable system\, and then relate the work to the\nchange in energy of the system. I will descr ibe an investigation into\nstudent reasoning about work\, energy\, and syst ems. Student\nperformance on written questions suggests that traditional i nstruction\nis insufficient to help students develop a functional understan ding of\nthese concepts. Many difficulties arise that affect students’ abil ity\nto reason about the changes in energy of an extended system. The\ndiff iculties identified by research have implications for instruction\nat the i ntroductory level and in subsequent courses. These findings\nhave prompted revisions to existing curriculum1 and guided the\ndevelopment of new tutori als to address many of the difficulties\nidentified by research. Results f rom two institutions will be\npresented to provide evidence for the effecti veness of the curriculum.\n\n1 Tutorials in Introductory Physics\, L.C. McD ermott\, P.S. Shaffer and\nthe Physics Education Group at the University of Washington\, Prentice\nHall (2002).\n LAST-MODIFIED:20230127T203824Z LOCATION:PHYS 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Education Research Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110914T183000Z DTEND:20110914T200000Z DTSTAMP:20260828T094430Z UID:qevvnl7p9nomv785v00f8op4ps@google.com CREATED:20110718T181840Z DESCRIPTION:SPEAKER: Yu Jia\, IHEP\, Chinese Acad. Sci.\, Beijing\n\nTITLE : Some Recent Progress in Understanding Heavy Quarkonia Electromagnetic Dec ays\n\nABSTRACT: In this talk\, I report some novel theoretical progresse s in understanding heavy quarkonium radiative decay processes. In particu lar\, I will focus on two phenomenologically-interesting M1 transition proc esses: X(3872)-->J/psi (psi')+gamma and Upsilon(3S)--> eta_b+gamma. F or the former process\, we find that the recent proposal of assigning X(387 2) of J^{PC}=2^{-+} is in stark contradiction with the existing B factory m easurements\; for the latter process\, taking into account the fact that t he emitted photon becomes rather energetic (E_gamma = 1 GeV)\, we propose the conventional multipole-expansion approach should be given up and we dev elop a novel "hard-scattering" mechanism. It is found that this new mechani sm can naturally account for the BaBar measurement without any adjustable a d hoc input parameters. LAST-MODIFIED:20230127T203623Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100422T140000 DTEND;TZID=America/New_York:20100422T153000 DTSTAMP:20260828T094430Z UID:arlt3qcd2dssc2t8ts9n4girrk@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com RECURRENCE-ID;TZID=America/New_York:20100422T140000 CREATED:20100308T142616Z DESCRIPTION:[Speaker] Maxim Dzero\n[Institution] University of Maryland\n[ Title] Topological Kondo Insulators\n[Abstract] In my talk I will explore t he possibility for novel type of\nstrongly correlated material which may su pport nontrivial insulating states. In particular\, I will discuss material s known as Kondo insulators. Kondo insulators are specific type of compound s where Kondo lattice effects lead to a formation of a band insulator. I wi ll describe the insulating phase within the large-N mean\nfield approximati on for the Kondo lattice model and classify the possible topological insula ting states with respect to the symmetry of the lowest lying Kramers double t of the cerium ion. General and practical prescription of calculating the Z2 topological indices for various lattice structures will be briefly outli ned. I will also discuss possible experimental implications of our theory f or the Ce-based Kondo insulators CeNiSn and CeRhSb. LAST-MODIFIED:20230127T203821Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221208T190000Z DTEND:20221208T203000Z DTSTAMP:20260828T094430Z UID:5jhn0s8k4en78534e42buub1co@google.com CREATED:20221117T153224Z DESCRIPTION:

      Title: Quantum interference of hydrodynamic modes despite Planckian \;dissipation in a strange metal. \;


      < /p>

      Marginal fermi liquid (MFL) phenomenology was invented30 \;years ago to describe the "strange metal" phase of the high-Tc \;superconduct ors. A key feature was strong("Planckian") dissipation of \;quasipartic les\, and the concomitant prediction of linear-T \;resistivity. The lat ter is considered a key experimental hallmark of \;strange metallicity now observed in a wide variety of quantum \;materials. We construct a c onsistent transport theory for a MFL\, but \;show that the Planckian di ssipation does NOT imply linear-T \;resistivity. In fact\, transport an d quasiparticle lifetimes are \;completely distinct\, and moreover conf using them violates charge \;conservation. Despite this\, we show that linear-T resistivity is still \;possible in our MFL transport theory\, but arises from an unanticipated \;source: elastic quantum interference corrections mediated by \;interactions (Altshuler-Aronov corrections). The linear-T arises from \;a very simple and universal mechanism\, whi ch is the relaxational form \;of force-mediating quantum-critical boson modes. I will explain the \;construction of our theory and the key pre dictions\, including \;competing mechanisms that can suppress or enhanc e superconductivity. \;Our results appear to imply that a quantum many- body system without \;well-defined quasiparticles (due to Planckian dis sipation) can still \;exhibit macroscopic quantum coherence in hydrodyn amic collective \;modes.

      Host: Johnpierre Paglione

      Location: Toll Physics Rm 1201

      Seminar also on Zoom\, \;Meet ing \;Link: \; \;https://umd.zoom.us/j/91301075848

      < b>Refreshments 1:30pm 1117 Toll Physics Bldg.       LAST-MODIFIED:20221206T133640Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Matthew Foster\, Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080919T173000Z DTEND:20080919T183000Z DTSTAMP:20260828T094430Z UID:5u4ji8acn67c5qhc0erq7m6si8@google.com CREATED:20080912T160920Z DESCRIPTION:Speaker:Prof. S. V. Ketov\, Tokyo Metropolitan University\, Jap an and CPST/EP\, University of Maryland at College Park\nTitle:"Superstring s-induced quartic curvature gravity and geometrical inflation"\n LAST-MODIFIED:20230127T203533Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JOINT PARTICLE AND GRAVITATION THEORY SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100217T170000Z DTEND:20100217T180000Z DTSTAMP:20260828T094430Z UID:32bl061ajgt45vblco3lutpar0@google.com CREATED:20100125T183120Z DESCRIPTION:Title : AppEl Seminar - Collective Coulomb Interaction Suppress ion of Noise and of Radiative Emission in Charged Particle Beams\nSpeaker Name: Prof. Avraham Gover\nSpeaker Institution : Tel Aviv University\n LAST-MODIFIED:20230127T203019Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100422T193000Z DTEND:20100422T203000Z DTSTAMP:20260828T094430Z UID:dr8ah8oa44f46crtd1csikgeg4@google.com CREATED:20100413T133031Z DESCRIPTION:Speaker: Andrew Brantlinger\, Department of Curriculum and Inst ruction\, University of Maryland\n\nTitle: Alternative Certification and Ma thematics Education in Inner City Middle and High Schools\n\nAbstract: The New York City Teaching Fellows (NYCTF) was started in 2000 to address “the most severe teacher shortage in New York's public school system in decades” (NYCTF\, 2008\, p. 1). From 2004-2008\, NYCTF was the largest alternative route to teacher certification program in the U.S. During that time period\ , NYCTF supplied two-thirds of new middle and high school mathematics teach ers in the New York City Public School System. In this talk I present the r esults of a case study of a first-year mathematics Teaching Fellow. I focus on her family and educational background\, her beliefs as a novice teacher \, preparation to teach mathematics\, and first year experience teaching mi ddle school mathematics in New York City (NYC). I situate the case study us ing results from a larger observational and survey study of hundreds of nov ice mathematics Teaching Fellows.\n LAST-MODIFIED:20230127T203155Z LOCATION:PHYS 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PERG Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120502T180000Z DTEND:20120502T190000Z DTSTAMP:20260828T094430Z UID:aqktnf7di3j7thd4l2dqib90s0@google.com CREATED:20120424T135423Z DESCRIPTION:"Approaches for the Optical Manipulation of Aerosols: Towards Ice Nucleation Studies"\nDr. David McGloin\nUniversity of Dundee LAST-MODIFIED:20230127T203542Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120329T173000Z DTEND:20120329T180000Z DTSTAMP:20260828T094430Z UID:0l59g1dgn8khvsmkc9rvtbsj3s@google.com CREATED:20120118T181355Z LAST-MODIFIED:20230127T203314Z LOCATION:Rm 1305 (the new Toll Rm) Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121210T160000 DTEND;TZID=America/New_York:20121210T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20121210T160000 CREATED:20120904T140915Z DESCRIPTION:Title : Disposing of Some Chaperonin Myths. How to Win a Lasker Prize But Get it Mostly Wrong.\n\nSpeaker Name: George H. Lorimer\n\nSpeak er Institution : University of Maryland LAST-MODIFIED:20230127T203255Z LOCATION:Room 1103\, Bioscience Research Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221103T180000Z DTEND:20221103T190000Z DTSTAMP:20260828T094430Z UID:5rlao7ii5k46565rcjoj540ig7@google.com CREATED:20220928T161810Z DESCRIPTION:PhD defense: Tianyu Li\, UMCP

      Title: \;Correlating Chemical Activity and Structures in Mesoporous Metal Oxides for Nerve Agent Decomposition

      LAST-MODIFIED:20220928T161810Z LOCATION:Chemistry Building\, Room 3219 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120221T170000Z DTEND:20120221T180000Z DTSTAMP:20260828T094430Z UID:p08u368nruvsgisgvg677g3fmo@google.com CREATED:20120215T160924Z DESCRIPTION:Title: Optical Properties of Vertically Aligned Carbon Nanotube Arrays\nSpeaker: Prof. Christopher C. Davis\nUniversity of Maryland LAST-MODIFIED:20230127T203132Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091002T170000Z DTEND:20091002T180000Z DTSTAMP:20260828T094430Z UID:nirc9rplp9v12ncmgjhi9963n4@google.com CREATED:20090914T172913Z DESCRIPTION:Title : Ge/Si: Quantum Dots\, Films and Magnetism\nSpeaker Nam e: Professor Jerry Floro\nSpeaker Institution : University of Virginia\nAbs tract : GexSi1-x readily grows heteroepitaxially on Si (001)\, with a compr essive lattice misfit strain up to 4% for the case of pure Ge on Si. GeSi h as arguably been *the* model materials system for investigating the energet ics and kinetics of misfit dislocation introduction\, and similarly for stu dies on the strain-driven self assembly of coherent islands\, aka quantum d ots. In the first part of my talk I’ll discuss our understanding of the gr owth science of quantum dots\, especially the role of elastic repulsion bet ween dots that accelerates coarsening\, ordering\, and shape transitions. But this is older work\, and I will quickly try to move into newer\, albeit early stage\, research on making Ge magnetic through the introduction of M n as a spin dopant. This is challenging since the solid solubility of Mn i n Ge is ridiculously low\, forcing us to work far from equilibrium in order to form metastable solutions up to several atomic percent. We are deliber ately growing amorp!\n\nhous Ge films\, where the goal is to better underst and the origins of magnetism and to demonstrate electric-field-controlled f erromagnetism. But ultimately the interest is in making Ge:Mn epitaxial qu antum dots\, a far more challenging prospect\, since dot self-assembly requ ires high adatom mobility\, which is in turn antithetical to metastable inc orporation of Mn. I’ll discuss strategies for accomplishing this\, and sho w some very preliminary results. The long-term goal is a new logic switch based on interactions between gated magnetic dots.\n LAST-MODIFIED:20230127T203835Z LOCATION:Room 2108\, Chemical and Nuclear Eng. Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081110T190000Z DTEND:20081110T200000Z DTSTAMP:20260828T094430Z UID:uak1anb3b58f94fuemieij1a4s@google.com CREATED:20080915T191051Z DESCRIPTION:Speaker:Paramita Dey\, Harishchandra Research Institute\nWeb si te: http://www.hri.res.in/\nTitle:"Two-loop neutrino masses with large R-pa rity violating interactions in\nsupersymmetry"\n LAST-MODIFIED:20230127T203712Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221201T200000Z DTEND:20221201T210000Z DTSTAMP:20260828T094430Z UID:4bk66un6b3ao479iq358edahii@google.com CREATED:20221128T162022Z DESCRIPTION:Literature Seminar

      Speaker: Zihan Sun

      Title:  \;A Dynamic Stab ility Design Strategy for Lithium Metal Solid State Batteries

       LAST-MODIFIED:20221128T162022Z LOCATION:IPST Building\, Conference Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110505T163000Z DTEND:20110505T173000Z DTSTAMP:20260828T094430Z UID:vposho4qgmav8nupp6ne64if40@google.com CREATED:20110505T122949Z DESCRIPTION:Title: Using Biomimetic Design to Increase Digging Efficiency i n Granular Substrates\nSpeaker: Dawn Wendell\, Department of Mechanical Eng ineering\, Massachusetts Institute of Technology LAST-MODIFIED:20230127T203557Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091012T143000Z DTEND:20091012T153000Z DTSTAMP:20260828T094430Z UID:edvfk3c3itp3aussfhrifhhuts@google.com CREATED:20091013T171543Z DESCRIPTION:*Title: Shot noise in helium lithography*\n*By: *Jack Wolfe\nDe partment of Electrical and Computer Engineering\nUniversity of Houston\n\n* Abstract:*\nA distinctive feature of helium ion or neutral atom lithography is that \nresists are 100 times more sensitive than for electrons. As a re sult\, \nthe ion density is sparse and subject to shot noise even in \nnon- amplified resists. This talk reports an integrated study of shot \nnoise in helium lithographies that compares variations in printed copies \nof the s ame mask feature with the predictions of a Monte-Carlo model \nthat incorpo rates 1) Poisson emission statistics\, 2) a random spatial \ndistribution o f particles within the aerial image\, 3) random particle \nscattering in th e resist\, and 4) smoothing of the deposited energy \nprofile by secondary electron diffusion and development effects.\n\nNeutral atom proximity litho graphy was used to print the experimental \nimages. The resist exposure pro cesses for neutrals\, including stopping \npower\, elastic scattering\, and internal secondary electron production\, \nare indistinguishable from ions \, but neutral particle images are \ncompletely free of the charging artifa cts that complicate the \ninterpretation of ion prints. In addition\, proxi mity lithography \nprovides much better control of aerial image blur than f ocused probe or \nprojection schemes.\nNeutral helium atoms were produced b y charge transfer scattering between \na 10 keV He+ ion beam and thermal he lium atoms in a differentially \npumped\, high pressure cell. This process produces energetic neutral \nparticles with essentially the same momentum a s the parent ions. The \nmask and wafer were clamped together with 125 μm s pacers and tilted on 2 \northogonal axes to create multiple offset prints o f each mask feature. \nThe resulting images are remarkably free of vibrati on. The mask\, a \nsilicon template with 74.5 nm circular openings on 400 n m pitch\, was \nprinted 4 times in a square pattern with 200 nm edges in \n poly(methylmethacrylate) (PMMA) resist. Random shape variations were \nfoun d among the four prints of each mask opening\, particularly within \nthe bo undary regions of partial exposure caused by penumbra. Independent \nexperi ments were used to determine the modeling parameters. Qualitative \nagreeme nt was found between the amplitude and length scale of the \nsimulated and experimental line edge roughness for both 74.5 nm openings \nand ~25 nm mas k defects.\n\nThe model predicts that reducing penumbra to 0.5 nm [1σ]\, wh ich can be \nachieved with a 20 μm proximity gap in our system\, greatly re duces the \nextent of line-edge roughness on 75.4 nm features. However\, th ere are so \nfew particles that significant shape variations remain for sub -25 nm \nfeatures. The 20-fold increase in critical dose for negative tone PMMA \nwould reduce shape fluctuations to less than 0.5 nm for 10 nm dots. The \nmodel also predicts sidewall striations due to the additional noise of \nthe scattering process.\n\nThe resolution limit of the lithographic pr ocess is determined by the \nresist smoothing function. However\, the extra ction of its standard \ndeviation σs from measurements of linewidth versus dose is complicated \nby aerial image blur and shot noise. We will show tha t the normalized \npower spectral density of line-edge roughness provides a n exquisitely \nsensitive measurement of σs\, independent of critical dose\ , overexposure \nfactor\, and aerial image blur. The statistical requiremen ts for \nobtaining high accuracy determinations of σs will be discussed dur ing \nthe talk. The method is applied to the interpretation of low temperat ure \nresist development. LAST-MODIFIED:20230127T203225Z LOCATION:Upstairs Conference Room\, LPS 8050 Greenme ad Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101018T140000Z DTEND:20101018T150000Z DTSTAMP:20260828T094430Z UID:kdg2ht15k764mcqajmcib2v3e0@google.com CREATED:20101008T180823Z DESCRIPTION:Title: Combining dynamical decoupling with fault-tolerant quant um computation\n \nDaniel Lidar\nProfessor of Electrical Engineering and Ch emistry at the University of\nSouthern California \n \nAbstract:\nThis talk will be a not very technical presentation of the very\ntechnical paper by the title above (arXiv:0911.3202\, joint work with\nHui Ng and John Preskil l)\, whose abstract reads as follows:\nWe study how dynamical decoupling (D D) pulse sequences can improve the\nreliability of quantum computers. We pr ove upper bounds on the\naccuracy of DD-protected quantum gates and derive sufficient\nconditions for DD-protected gates to outperform unprotected\nga tes. Under suitable conditions\, fault-tolerant quantum circuits\nconstruct ed from DD-protected gates can tolerate stronger noise\, and\nhave a lower overhead cost\, than fault-tolerant circuits constructed\nfrom unprotected gates. Our accuracy estimates depend on the dynamics\nof the bath that coup les to the quantum computer\, and can be expressed\neither in terms of the operator norm of the bath's Hamiltonian or in\nterms of the power spectrum of bath correlations\; we explain in\nparticular how the performance of rec ursively generated concatenated\npulse sequences can be analyzed from eithe r viewpoint. Our results\napply to Hamiltonian noise models with limited sp atial correlations. LAST-MODIFIED:20230127T203441Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221020T153000 DTEND;TZID=America/New_York:20221020T170000 RRULE:FREQ=WEEKLY;UNTIL=20221229T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20221124T153000 DTSTAMP:20260828T094430Z UID:1d79i5dnaau5u72j09nopncpv8_R20221020T193000@google.com CREATED:20220905T135853Z DESCRIPTION:

      Organizers: S. Jim Gat es (Physics)\, Richard Wentwor th (Math)\, Tristan Hubsch ( Physics\, Howard Univ.)\, Jonathan Rosenberg (Math)\, Amin Gh olampour (Math)
      Other Faculty Participants: Paul Green (Math\, emeritus)
       \;

      When: Thursdays @ 3:30pm-4:30pm
      Where: Toll bldg.\, room 0405 &\; hybrid

      Please download and imp ort the following iCalendar (.ics) files to your calendar system.
      Weekly : https://umd.zoom.us/meeting/tJUucuiurzIpHNychTfBrN1yA4OLScbSt3om/ics?icsToken=98tyKuCprT4rHNWcsx-PRowcA4_4d-7zmFhego1 EnxfRBQJBTFLvF7ZtHoF8EuvE

      Join Zoom Meeting
      https://umd.zoom.us/j/91351619368< /a>

      Meeting ID: 913 5161 9368


      This interdisciplinary RIT will aim to foster interactions between mathema ticians and physicists on topics of mutual interest. \; It will roughly follow the example of a similar RIT from 2010-2011 and from the last three years. The to pic for 2016-17 was mirror symmetry. \; Topics since 2017-2018 are list ed below to give you an idea of what sort of things we tend to cover.

      It is not assumed that participants already be knowledgeable in both< /i> math and physics\, just in some aspect of one or the other. Relevant ma th topics are differential geometry\, representation theory\, algebraic top ology\, and algebraic geometry. Relevant physics topics are classical and q uantum field theories\, and supersymmetry.

      Students (advanced under graduates or graduate students) who want to participate can get 1-3 credits as MATH 489 (undergrad) or MATH/AMSC 689 (graduate) if they wish\, by cont acting the organizers.

      Topics and references for 2022-2023

      < p>The topic for (at least the first half of) fall 2022 is supersymmetry and representation theory. \; Here are a few basic references:

      1. Ursula Wichter\, Designing supersymmetry
      2. Y an X. Zhang\, Adinkras for mathematicians
      3.  \;a quick bibliography for physicists at INSPIRE
      4. a book draft on "An Introduction to Supersymmetr y Using Adinkras" by Charles Doran\, Kevin Iga\, and Ursula Whitcher. \ ; not for public distribution yet\, but \; will be made available to pa rticipants
       LAST-MODIFIED:20221227T190734Z LOCATION:Toll rm 0405 & hybrid SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100922T191500Z DTEND:20100922T201500Z DTSTAMP:20260828T094430Z UID:kfi9maom6r1s515oues5oj383g@google.com CREATED:20100908T202556Z DESCRIPTION:[Title] "Non-closed Universe and Zero Cosmological Constant fro m Normalized General Relativity"\n[Speaker] Shimon Rubin\n[Institution] Ben -Gurion University\, Israel\n[Abstract] Constant shift in the Einstein-Hilb ert Lagrangian is a symmetry of the Normalized General Relativity action. T he theory offers a simple resolution to the first \ncosmological constant p uzzle. Unfortunately\, standard Friedmann-Robertson-Walker cosmology cannot be directly addressed within the framework of such a theory because a perf ect fluid energy-momentum tensor is not derivable from a matter Lagrangian. However\, this technical difficulty can be effectively bypassed at the min isuperspace level\, where we prove that (i) If matter is attractive then th e Universe cannot be closed\, and reassure that (ii) The accompanying cosmo logical constant generically vanishes. Interestingly\, the theory also allo ws for non-generic solutions with non vanishing cosmological constant\, whi ch are associated with Einstein static closed and Eddington-Lemaitre univer ses. LAST-MODIFIED:20230127T203503Z LOCATION:4102 Physics Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131203T160000Z DTEND:20131203T170000Z DTSTAMP:20260828T094430Z UID:g7ktlv1nn7prlbaho0hslu3tq4@google.com CREATED:20131113T203815Z DESCRIPTION:Title: Forecasting neutron star temperatures\n\nSpeaker: Sanjay Reddy\, INT/University of Washington\n\nAbstract: A subclass of neutron s tars called quasi-persistent sources accrete matter from a companion episod ically. After a bout of intense accretion\, x-ray observations indicate tha t the neutron star surface cools on a time scale of several hundred days. I will review theoretical developments that have helped interpret these obse rvations as thermal relaxation of a hot neutron star crust. Novel nuclear r eactions and the properties of matter that is simultaneously solid and supe rfluid play a role. Although some questions remain\, by fitting light curve s of several sources\, I show that the future thermal evolution of a neutro n star that is currently cooling post accretion can be predicted and tested . As we develop more confidence in these cooling models\, they can be used to obtain new insights about properties of matter at extreme density (10^10 -10^14 g/cm^3) and relatively low temperature. LAST-MODIFIED:20230127T203054Z LOCATION:4102 Physics SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221115T160000Z DTEND:20221115T170000Z DTSTAMP:20260828T094430Z UID:4mqm08fgqb1fl9muuhci7k10er@google.com CREATED:20221031T153843Z DESCRIPTION:PhD Defense

      Speaker: Matthew Leonard\, UMCP
      Advisor: Dr. Efrain Rodriguez\, UMCP

      Title: \;       A Breath of Fresh Air: Study of Reactive Porous Metal Oxides for Chemical W arfare Agent and Simulant Defeat LAST-MODIFIED:20221107T155507Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130205T160000Z DTEND:20130205T173000Z DTSTAMP:20260828T094430Z UID:9h08q104e0n3ae6tr23cu47pb4@google.com CREATED:20130115T143710Z DESCRIPTION:Title : Zero-energy flat bands in noncentrosymmetric supercond uctors\n\nSpeaker Name: Philip Brydon\n\nSpeaker Institution : Dresden Univ ersity of Technology\n\nAbstract: The superconductivity of noncentrosymmet ric materials has attracted much attention due to the possible realization of an exotic mixed-parity pairing state. Such systems also show a rich vari ety of topological phases\; in particular\, it has recently been pointed ou t that nodal noncentrosymmetric superconductors are an example of a topolog ically non-trivial gapless state [1]. In this case a bulk-boundary correspo ndence can be developed\, which guarantees the existence of a nondegenerate zero-energy flat band within the projection of the nodal lines onto the su rface Brillouin zone. Using a quasiclassical scattering method [2]\, I cons truct the surface bound state spectra\, obtain an existence condition for t he zero-energy flat bands in terms of the gap sign structure\, and show tha t they leave distinct signatures in the tunneling conductance. Moreover\, t he surface states are found to be strongly spin- polarized. When placed in proximity contact with a ferromagnet\, the coupling to the exchange field g enerates an interface current that contains signatures of the superconducto r's topological state [3]. The presence of flat bands is characterized by a n enormous enhancement of the current at low temperatures and a singular de pendence on the exchange field strength. LAST-MODIFIED:20230127T203002Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110210T160000Z DTEND:20110210T170000Z DTSTAMP:20260828T094430Z UID:ia7c26gpoj8acfsdtpi9ads604@google.com CREATED:20110203T140238Z DESCRIPTION:Title: Engineering Titanium Dioxide Nanomaterials for Renewable Energy Applications\nSpeaker: Xiaobo Chen\nEnvironmental Energy Technology Department\nLawrence Berkeley National Lab\nUniversity of California\, Ber keley\nAbstract: The rapid depletion of the fossil fuel reserves\, the incr ease of green-house gas emissions and other environmental pollutions\, brin g up an urgent need for the development of renewable and clean energy sourc es. The ability to use sunlight to produce fuels such as H2 and electricity from abundant\, non-toxic resources\, and to decompose environmental pollu tions with benign catalysts\, would revolutionize our civilization. Here\, I would like to present our study on engineering white titanium dioxide nan omaterials into yellow and black titanium dioxide to efficiently remove the se pollutions and to generate hydrogen from water. The fundamental material s and chemical characterizations will be discussed in details. LAST-MODIFIED:20230127T203105Z LOCATION:Room 1105\, Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111209T190000Z DTEND:20111209T200000Z DTSTAMP:20260828T094430Z UID:h0drdbilijrt8crhpusmkn457s@google.com CREATED:20111118T192127Z DESCRIPTION:Title : The Future of Nuclear Energy\nSpeaker Name: Dr. Richard L. Garwin\,IBM Fellow Emeritus\nSpeaker Institution : IBM Thomas J. Watson Research Center\nAbstract : The pre-­‐‑Fukushima talk of a renaissance enr gy has been replaced by the recognition that we must modif your approach if nuclear power is to regain public support and to be able to compete on the basis of economics and safety with other sources of energy in the near and long term. The talk discusses the question of secure fuel supply\, acciden t\, the role of reprocessing\, and of breeder reactors of the future.\n LAST-MODIFIED:20230127T203809Z LOCATION:3117 CSIC SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Transforming Energy Lecture Series Sponsored by the Univ. of Maryla nd Energy Research Center TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T183000Z DTEND:20221116T200000Z DTSTAMP:20260828T094430Z UID:2j2ebvk5e1k51q2traip248fi8@google.com CREATED:20220727T185750Z DESCRIPTION:Seminar will be at Johns Hopkins University.

      Preceded by lunch at 12:00pm.

      Speaker: B o Jayatilaka\, Fermilab

      Title: High-Precision Measurement of the W B oson Mass at CDF

      Abstract: We present a measurement of the mass of t he W boson\, the charged mediator of the weak force. The measurement is per formed using data corresponding to 8.8/fb of integrated luminosity collecte d by the CDF detector at the Fermilab Tevatron between 2002 and 2011. In a sample with approximately 4 million W boson candidate events\, we measure M (W) = 80433.5+-6.4(stat)+-6.9(syst) MeV = 80433.5+-9.4 MeV. The measurement has a precision exceeding that of all previous measurements of M(W) combin ed and it is in significant tension
      with the standard model expectation.
      --
       LAST-MODIFIED:20221111T142641Z LOCATION:Room: 462 in the JHU Bloomberg Center for Physics and Astronomy SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120924T160000 DTEND;TZID=America/New_York:20120924T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20120924T160000 CREATED:20120904T140915Z DESCRIPTION:SPEAKER: Philip Bryan\, IBBR & Bioengineering\, UMCP\,\nTITLE: A 20-year perspective on engineering proteases: \nFrom damaging perfectly good enzymes to\nenzymatic machines for biological computing LAST-MODIFIED:20230127T203255Z LOCATION:Rm 1103\, BRB Building #413 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130227T203000Z DTEND:20130227T220000Z DTSTAMP:20260828T094430Z UID:mc1fr18renf3cl86jnatkajpj8@google.com CREATED:20130217T035655Z DESCRIPTION:Speaker: J.C. Seamus Davis\, Cornell University & Brookhaven Na tional Laboratory\n\nTitle: Evolution of Electronic Broken Symmetry and Fe rmi Surface Topology across the Cuprate Quantum Critical Point\n\nAbstract: Hole doping destroys the cuprate antiferromagnetic Mott-insulator state a nd yields by far the highest temperature superconductivity known. However\ , it also generates the infamous pseudogap phase\, which then disappears at a quantum critical point near 20% hole density. The pseudogap is so called because an unidentified energy gap opens in the spectrum of electronic exc itations. Atomic scale visualization of electronic structure has revealed that this gap is associated with electronic symmetry breaking (Nature 430\, 1001 (2004)\; Science 315\, 1380 (2007)\; Science 333\, 426 (2011)). The c oncurrent momentum-space electronic structure consists of a so called Fermi -arc which can also be visualized by using Fourier-transform STM (Nature 45 4\, 1072 (2008)). But the relationship between these highly distinct pheno mena of real-space symmetry breaking and momentum-space Fermi arc\, and how they evolve through the critical hole-density\, is unknown. Here we report on the first study of the simultaneous evolution of electronic symmetry br eaking and Fermi surface topology upon transit through the cuprate quantum critical point. The results are vivid\, unambiguous\, and greatly advance o ur understanding of the interplay of the pseudogap and the superconductivit y in cuprates.\n\nHost: J.Paglione/R.Greene LAST-MODIFIED:20230127T203620Z LOCATION:Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CNAM DISTINGUISHED LECTURER SERIES TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130426T190000Z DTEND:20130426T200000Z DTSTAMP:20260828T094430Z UID:2loqcmk3c9k2af3dk70sk1p2o8@google.com CREATED:20130328T153204Z DESCRIPTION:Speaker: David Kaplan\nInstitution:University of Washington\nTi tle: "Little Flavor"\nAbstract: We describe a model of quarks which identif ies the large global symmetries of little Higgs models with the global flav or symmetries that arise in a deconstruction of the extra-dimensional “topo logical insulator” model of flavor. The nonlinearly realized symmetries of little Higgs theories play a critical role in determining the flavor struct ure of fermion masses and mixing. All of flavor physics occurs at the few T eV scale in this model\, yet flavor changing neutral currents arising from the new physics are naturally smaller than those generated radiatively in t he standard model\, without having to invoke minimal flavor violation. LAST-MODIFIED:20230127T203746Z LOCATION:1201 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090925T170000Z DTEND:20090925T180000Z DTSTAMP:20260828T094430Z UID:1mvaittmeft9hc1so393oeiod8@google.com CREATED:20090914T173525Z DESCRIPTION:Title : Development of a Lower Temperature SOFC\nSpeaker Name: Dr. Eric D. Wachsman\nSpeaker Institution : University of Maryland\nAbstrac t : There has been a tremendous effort to lower the operating temperature o f solid oxide fuel cells (SOFC) to ≤800°C\, for cost and reliability consid erations\; while simultaneously there has been an even larger effort to inc rease the operating temperature of proton exchange membrane fuel cells (PEM FC) to >100°C\, for performance and fuel poisoning considerations. Somewhe re in between is the optimum operating temperature for a fuel cell dependin g on fuel choice and degree of external fuel processing (vs. relying exclus ively on internal reforming). To date there has been limited success at ob taining a PEM electrolyte capable of operating in this temperature range. \ n\nIn contrast\, alternate higher conductivity\, and thus lower temperature \, oxide electrolytes have existed for some time (ranging from gallates and ceria to bismuth oxide based materials). However\, each of these material s has it's own specific issues. Moreover\, transitioning from a zirconia e lectrolyte to one of these alternate electrolytes requires development of a n entirely new cell material set.\n\nOver the last 20 years we have focused on using the most conductive\, and hence lowest temperature\, bismuth oxid e based electrolyte. To overcome its inherent instability in reducing envi ronments we developed a bilayer bismuth-oxide/ceria electrolyte. To overc ome reactivity with more conventional cathode materials we developed a bism uth-ruthenate/bismuth-oxide composite cathode. Finally\, these materials w ere integrated into an anode supported cell resulting in power densities of ~2 W/cm2 at 650°C.\n\nThe materials issues\, how they were addressed\, and the ultimate performance achieved will be discussed. LAST-MODIFIED:20230127T203707Z LOCATION:Room 2108\, Chemical and Nuclear Eng. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120418T181500Z DTEND:20120418T191500Z DTSTAMP:20260828T094430Z UID:qdlknov73vrkoit2pmo6kp4udo@google.com CREATED:20120216T182359Z DESCRIPTION:SPEAKER: Andre Walker-Loud - Lawrence Berkeley Natl Lab\, CA\n TITLE: M_n - M_p\nABSTRACT: The neutron-proton mass splitting plays a sign ificant role in early stages of the evolution of the universe. Small adjus tments of quark masses or electromagnetic coupling lead to significant vari ations of the neutron lifetime and the primordial abundance of hydrogen\, h elium and other light nuclei. In the Standard Model\, there are two sourc es for this isospin breaking: the light quark mass splitting and the electr omagnetic coupling to the up and down quarks. We provide a modern\, robust determination of the electromagnetic self-energy correction to M_p - M_n\, drawing attention to the connection to the isovector magnetic polarizabili ty. \n LAST-MODIFIED:20230127T203800Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100406T160000 DTEND;TZID=America/New_York:20100406T170000 DTSTAMP:20260828T094430Z UID:n8imjstf0jhgub00654jseoc48@google.com RECURRENCE-ID;TZID=America/New_York:20100406T160000 CREATED:20100115T170209Z DESCRIPTION:Speaker: Prof. Jim Gates\, University of Maryland\nTitle: "Is P hysical Reality `The Matrix?'"\nAbstract: In a quest for a rigorous mathema tical foundation\n for Superstring/M-Theory\, new structures (`Adinkras')\n have been proposed as appropriate objects of study.\n This has led to the discovery of a nexus involving\n graph theory\, Clifford Algebras and Infor mation Theory\n in a possible new realization of Wheeler's 'It From\n Bit' paradigm.\n LAST-MODIFIED:20230127T203611Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091005T190000Z DTEND:20091005T200000Z DTSTAMP:20260828T094430Z UID:8eau502t7tmiegthejvorb8pp0@google.com CREATED:20091003T000018Z DESCRIPTION:Title : On the thermal history of gauge mediation\nSpeaker Name : Andrey Katz\nSpeaker Institution : University of Maryland\nNotes: This is the Elementary Particle Theory Seminar\nAbstract : Many messenger models o f gauge mediation are based on meta-stable vacua. In this talk I will discu ss the thermal history of generic messenger models\, also known as ''Extra -Ordinary gauge mediation``. I will show that while some of the models cle arly prefer a supersymmetric vacuum\, there is a vast class of models where the answer strongly depends on the initial conditions. Along with the va cuum at the origin\, the high temperature thermal potential also possesses a local minimum far away from the origin. This vacuum has no analog at ze ro temperature. The first order phase transition from this vacuum into the supersymmetric vacuum is parametrically suppressed\, and the theory\, star ting from that vacuum\, is likely to evolve to the desired gauge-mediation vacuum.\n LAST-MODIFIED:20230127T203614Z LOCATION:PHYS 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091116T173000Z DTEND:20091116T183000Z DTSTAMP:20260828T094430Z UID:4gr3kco5mdi2vhn1duf57fnd6c@google.com CREATED:20091026T165506Z DESCRIPTION:Title : Title: Experimental quantum error correction\nSpeaker N ame: Raymond Laflamme\nSpeaker Institution : Institute for Quantum Computin g and University of Waterloo\, Canada\nAbstract : The Achilles' heel of qu antum information processors is the fragility of quantum states and process es. Without a method to control imperfection and imprecision of quantum de vices\, the probability that a quantum computation succeed will decrease ex ponentially in the number of gates it requires. In the last ten years\, bui lding on the discovery of quantum error correction\, accuracy threshold the orems were proved showing that error can be controlled using a reasonable a mount of resources as long as the error rate is smaller than a certain thre shold. We thus have a scalable theory describing how to control quantum sy stems. I will briefly review some of the assumptions of the accuracy thresh old theorems and comment on experiments that have been done and should be d one to turn quantum error correction into an experimental reality.\n LAST-MODIFIED:20230127T203839Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120214T120000 DTEND;TZID=America/New_York:20120214T130000 DTSTAMP:20260828T094430Z UID:aup3qs4q9j4cektnigdh623aa8@google.com RECURRENCE-ID;TZID=America/New_York:20120214T120000 CREATED:20120119T153520Z DESCRIPTION:Speaker: Dr. Dan Gordon\nNaval Research Laboratory \nTitle: Ful l Scale Numerical Modeling of Photoionization LAST-MODIFIED:20230127T203454Z LOCATION:Large Conference Room (1207)\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111129T203000Z DTEND:20111129T213000Z DTSTAMP:20260828T094430Z UID:lieh5f53sgk059pfdv6kbd7lgc@google.com CREATED:20111121T201330Z DESCRIPTION:Title: "Exploring the corner: numerical relativity near space-l ike infinity"\nSpeaker: Jorg Frauendiener\nInstitution: Mathematics and Sta tistics Department\, University of Otago\, New Zealand\nAbstract: Numerical Relativity has made tremendous advances over the last decade. However\, th ere are still some issues which need clarification. One of these is the que stion of the outer boundary. It is well known that modeling an infinite dom ain using a finite outer boundary creates problems\, not only numerically b ut even more so conceptually. A partial \nsolution of this issue is obtaine d by focussing on the hyperboloidal initial value problem using the conform al field equations or by regularising the equations at infinity. This still leaves the problem of having to specify hyperboloidal initial data in cont rast to asymptotically Euclidean data based on a Cauchy hypersurface (that we might be more used to) and one needs to find a way of connecting data on a Cauchy surface with those on a hyperboloidal hypersurface. In this talk I will describe a particular attempt to tackle this problem based on method s developed by H. Friedrich.\n LAST-MODIFIED:20230127T203559Z LOCATION:the colloquium room of the Mathematics Department (MTH3206) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint NA-GRT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221021T190000Z DTEND:20221021T200000Z DTSTAMP:20260828T094430Z UID:7v1se4rk3grh9ha486v1j0inp7@google.com CREATED:20221011T165934Z DESCRIPTION:Literature Seminar: Esther Atinuke Olonimoyo\, UMCP

      Titl e: \;Optical Properties of Secondary Organic Aerosol Produced by Photooxidation of Naph thalene under NOx Condition

      Abstract: \;https://chem.umd.edu/events/optical-properties-secondary-org anic-aerosol-produced-photooxidation-naphthalene-under-nox LAST-MODIFIED:20221011T165934Z LOCATION:A.V. Williams Building\, Room 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221003T150000Z DTEND:20221003T160000Z DTSTAMP:20260828T094430Z UID:73pe0s6vfiknt4mpmcnf3u1s5i@google.com CREATED:20220818T205036Z DESCRIPTION:Speaker: Roman Lutchyn\, Partner Research Manager\, Microsoft Quantum

      Title: \;Topological Quantum Computation with Majorana zero-energy modes


      Abstract: Research in quantum computing has offered many new physi cal insights and a potential to exponentially increase the computational po wer that can be harnessed to solve important problems in science and techno logy. The largest fundamental barrier to building a scalable quantum comput er is errors caused by decoherence. Topological quantum computing overcomes this barrier by exploiting topological materials which\, by their nature\, limit errors. In this colloquium\, I will discuss how to engineer topologi cal superconductors supporting Majorana zero-energy modes at the interface of a conventional superconductor and a semiconductor with spin-orbit intera ction. I will present recent results by the Microsoft Quantum team consiste nt with the emergence of topological superconductivity in proximitized semi conductor nanowires. Finally\, I will present a proposal for scalable quant um computing involving topological qubits which comprise of superconducting islands in a Coulomb blockade regime hosting aggregates of four or more Ma jorana zero modes.




      LAST-MODIFIED:20220919T212146Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Roman Lutchyn TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131015T171500Z DTEND:20131015T183000Z DTSTAMP:20260828T094430Z UID:nsqavi1pea6dhfdv5srscrm6ts@google.com CREATED:20131007T171537Z DESCRIPTION:Location: Room 1116\, IPST Building\, Bldg 85\nTitle : A Path-B ased Approach to Characterizing Dynamical Processes on Complex Landscapes.\ nSpeaker Name: Professor Alexandre Morozov\nSpeaker Institution : Rutgers U niversity\n LAST-MODIFIED:20230127T203545Z LOCATION:Room 1116\, IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221115T160000 DTEND;TZID=America/New_York:20221115T170000 DTSTAMP:20260828T094430Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221115T160000 CREATED:20210423T130624Z DESCRIPTION:

      Roald Sagdeev
      Distinguished University Professor Emeritus of Physics\, University of M aryland

      "The Science of Sakharov "

      3:30 p.m. Light Refreshments

      4 p.m. Lecture

      John S. Toll Physics Building\, Room 1410

      Andrei Sakharov's outstanding contribution covers a wide area o f applied and fundamental physics\, despite the fact that he regretted that he was only doing great physics "on the sidelines." In 1950\, Sakharov and Tamm came up with the concept of controlled fusion\, which led to the majo r international ITER project under construction in France. Then he took up the old important unsolved problem of matter distribution non-uniformities in the Universe and\, as a solution\, proposed that the remnants of quantum fluctuations in the early phases after the Big Bang play a key role. Baryo n asymmetry has been another grand challenge in which Sakharov's name has b een known since 1967\, when he published the famous three conditions that t he basic laws of physics and cosmology must satisfy in order to explain the dominance of matter over antimatter in our Universe.

      About the Speaker
      Roald Sagdeev is a UMD Distinguishe d University Professor Emeritus of Physics. He earned his Ph.D. in 1966 fro m Moscow State University and served for 15 years as director of the Space Research Institute\, the Moscow-based center of the Russian space explorati on program\, where he holds the title of director emeritus. Prior to his wo rk with the Soviet space exploration program\, he had a distinguished caree r in nuclear science with international recognition for his work on the beh avior of hot plasma and controlled thermonuclear fusion. He is a member of the National Academy of Sciences\, the Royal Swedish Academy\, the Max Plan ck Society and the International Academy of Aeronautics. Sagdeev has receiv ed the American Astronautical Society's Carl Sagan Memorial Award and the A merican Physical Society's James Clerk Maxwell Prize for Plasma Physics.

      About the Lecture
      Chuan-Sheng Liu and Jingyi Liu established the John S. Toll Endowed Lecture in Physics at t he University of Maryland to honor the enormous legacy of John Toll (1923-2 011) and bring some of the brightest physicists to UMD's campus to share th eir talent and enthusiasm with the community. The Lius' generous gift was f ollowed by a contribution from Toll’s widow\, Deborah Toll\, who was thrill ed to see her husband being honored in this way.

      John Toll served as chair of UMD's Department of Physics and Astronomy from 1953 to 1965\, rec ruiting dozens of top-tier scientists and catapulting the department onto a n international stage. As president of UMD from 1978 to 1988 and founding c hancellor of the University System of Maryland from 1988 to 1989\, Toll hel ped grow the system and elevate its reputation.

      Chuan Liu is a profe ssor emeritus of physics who joined UMD in 1974 and served as department ch air from 1985 to 1990 and 1993 to 1994. His wife\, Jingyi Liu (M.S. '83\, c ommunications\; Ph.D. '91\, radio/tv/film)\, was a cross-cultural communica tion consultant\, educator and TV producer for educational programs\, and s he served as a contract interpreter for the U.S. Department of State.

       \;
      https://scienc e.umd.edu/events/toll-2022.html       LAST-MODIFIED:20221104T153227Z LOCATION:Room 1410\, John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:John S. Toll Endowed Lecture/Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120423T163000Z DTEND:20120423T173000Z DTSTAMP:20260828T094430Z UID:6rm5fmk7191ms0e66vc7n72p54@google.com CREATED:20120409T132038Z DESCRIPTION:Speaker: Marcos Rigol\, Georgetown University \n\nTitle: Relaxa tion dynamics and thermalization in isolated quantum systems\n\nAbstract: L ittle more than fifty years ago\, Fermi\, Pasta\, and Ulam set up a numeric al experiment to prove the ergodic hypothesis for a one-dimensional lattice of harmonic oscillators when nonlinear couplings were added. Much to their surprise\, the system exhibited long-time periodic dynamics with no signal s of ergodic behavior. Those results motivated intense research\, which ult imately gave rise to the modern chaos theory and to a better understanding of the basic principles of classical statistical mechanics. More recently\, experiments with ultracold gases in one-dimensional geometries have challe nged our understanding of the quantum domain. After bringing a nearly isola ted system out of equilibrium\, no signals of relaxation to the expected th ermal equilibrium distribution were observed. Some of those results can be understood in the framework of integrable quantum systems\, but then it rem ains the question of why thermalization did not occur even when the system was supposed to be far from integrability. In the latter regime\, thermaliz ation is expected to occur and can be understood on the basis of the eigens tate thermalization hypothesis. In this talk\, we discuss some of the early theoretical and experimental results on this topic. We then show how therm alization breaks down in finite one-dimensional quantum systems as one appr oaches an integrable point. We establish a direct connection between the pr esence or absence of thermalization and the validity or failure of the eige nstate thermalization hypothesis\, respectively. \n\nReferences: \n[1] M. R igol\, V. Dunjko\, and M. Olshanii\, Nature 452\, 854 (2008). \n[2] M. Rigo l\, Phys. Rev. Lett. 103\, 100403 (2009)\; Phys. Rev. A 80\, 053607 (2009). \n[3] L. F. Santos and M. Rigol\, Phys. Rev. E 81\, 036206 (2010)\; Phys. Rev. E 82\, 031130 (2010).\n\n LAST-MODIFIED:20230127T203205Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110420T153000Z DTEND:20110420T170000Z DTSTAMP:20260828T094430Z UID:q37ub5uo69p5qnccgpgnsopgq4@google.com CREATED:00010101T000000Z DESCRIPTION:SPEAKER: Andrea Ferroglia - New York City College of Technolog y\, Brooklyn\nTITLE: Top Quark Pair Production Beyond Next-to-Leading Orde r\nABSTRACT: The production of top-quark pairs plays a central role in the physics programs of the Tevatron and the LHC. The large number of top-pair events which will be observed at the LHC will allow precise measurements o f the top-pair production total cross section and differential distribution s. On the theoretical side\, predictions more accurate than the ones obtain ed by considering next-to-leading-order QCD corrections are needed.\n\nIn t his talk\, I will describe the calculations of the total pair\nproduction c ross section\, of the pair invariant mass distribution\, of the top-quark r apidity distribution and of the top-quark transverse momentum distribution at Tevatron and LHC energies. These calculations were carried out by emplo ying effective field theory methods\, thereby allowing the resummation of l arge logarithmic corrections in the soft gluon emission limit.\n\nFurthermo re\, I will discuss recent progress in calculating the\nnext-to-next-to-lea ding order corrections to the top-quark pair\nproduction process\, with par ticular attention to the calculation of\nthe two-loop Feynman diagrams.\n LAST-MODIFIED:20230127T203519Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080916T220000Z DTEND:20080916T230000Z DTSTAMP:20260828T094430Z UID:p0o4d2ac00dmrabv5hdeb5hipk@google.com CREATED:20080912T160128Z DESCRIPTION:Speaker:Jeffrey Mazer\, U.S. Department of Energy\nTitle:"Photo voltaic Technology and the DOE¹s Solar America Initiative"\n LAST-MODIFIED:20230127T203118Z LOCATION:Kim Building\, Room: 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SEMINAR AND MONTHLY MEETING - UM OSA/SPIE STUDENT CHAPTER TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090922T171500Z DTEND:20090922T183000Z DTSTAMP:20260828T094430Z UID:o9607rm73799pfue5ug1n1qq3k@google.com CREATED:20090914T141239Z DESCRIPTION:Title : Bioinspired Nonlinear Ionic Systems: Fluctuations and O scillations in Single Nanopores\nSpeaker Name: Professor Zuzanna Siwy\nSpea ker Institution : UC Irvine\nNotes: As in the past\, each seminar will be p receded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon).\n\nFor further infor mation contact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\, (301) 405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)405-4802\nProfessor Mic helle Girvan\, Girvan@umd.edu\, (301)405-1610.\n LAST-MODIFIED:20230127T203149Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130128T150000Z DTEND:20130128T163000Z DTSTAMP:20260828T094430Z UID:pg0nrivdc5edijecdfpvflebts@google.com CREATED:20130115T143311Z DESCRIPTION:Title : Application of conditional independence to gapped quant um many-body systems\n\nSpeaker Name: Isaac Kim\n\nSpeaker Institution : Ca lifornia Institute of Technology\n\nAbstract : It is widely known in the qu antum information community that the states that satisfy strong subadditivi ty of entropy with equality have the form of quantum Markov chain. Based on a recent strengthening of strong subadditivity of entropy\, I will describ e how such structure can be exploited in the studies of gapped quantum many - body system. In particular\, I will describe a diagrammatic trick to i) g ive a quantitative statement about the locality of entanglement spectrum ii ) perturbatively bound changes of topological entanglement entropy under ge neric perturbation. LAST-MODIFIED:20230127T203714Z LOCATION:PHYS 2205 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121126T173000Z DTEND:20121126T183000Z DTSTAMP:20260828T094430Z UID:d9tvd60ieuovip0bnqq1c3p9vs@google.com CREATED:20121126T151353Z DESCRIPTION:Title: "Many-body dynamics in open systems: Rydberg gases and R ydberg polaritons"\nSpeaker: Michael Fleischhauer\, University of Kaiserlau tern\nAbstract: Quantum optical realizations of many-body systems must oft en be described as open systems and thus offer a way to study quantum corre lations in the non-equilibrium steady-state rather than the ground state of a Hamiltonian. \nBeing an attractor of the dynamics\, stationary states ha ve the advantage of being robust and providing a natural way of preparation .\nLittle is known\, however\, about many-body phenomena such as phase tran sitions in open systems. These questions will be addressed for free lattice models and the experimentally relevant example of optically driven Rydberg gases and Rydberg polaritons. The strong and long-range van-der Waals repu lsion drives the system into a state of Rydberg excitations with crystallin e order which however competes with fluctuations inherent to the open syste m. Quantum correlations in the steady state are calculated by open-system D MRG simulations and discussed in terms of an analytically solvable effectiv e model. Finally the build-up dynamics of the stationary state is discussed .\n\n LAST-MODIFIED:20230127T203146Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Michael Fleiscchauer TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111121T210000Z DTEND:20111121T223000Z DTSTAMP:20260828T094430Z UID:lpojvcl5ijhii545t3jfte5k44@google.com CREATED:20111115T151237Z DESCRIPTION:Title : Understanding the Mechanism of Polyubiquitin Chain Asse mbly Using Solution State NMR Spectroscopy\nSpeaker Name: Professor Joel To lman\nSpeaker Institution : Johns Hopkins University\n LAST-MODIFIED:20230127T203755Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100324T163000Z DTEND:20100324T173000Z DTSTAMP:20260828T094430Z UID:qsh9t6mmqq7o5m5u89idhnvhi8@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100223T153058Z DESCRIPTION:SPEAKER: Ambar Jain\n\nAFFILIATION: Carnegie Mellon Univ.\, Pit tsburgh PA\n\nTITLE: R-evolution\, A New Type of Renormalization Group Evo lution and Its Application to OPE and QCD\n\nABSTRACT: I will talk about th e infrared instabilities known as the \nrenormalon ambiguities in the pertu rbation theory. I will give several examples of how we usually deal with th em in order to obtain stable theoretical predictions. In this regard I will demonstrate that we need to \nintroduce infrared (IR) scales in perturbati on theory and I will talk about their interplay with the dynamics. The pres ence of IR scales in quantum \nchromodynamics (QCD)--generically referred a s 'R' in my talk--ensues large logs in perturbation theory. I will introduc e a new type of renormalization group evolution in the scale R (hence the n ame R-evolution) which resums \nthe large logs. I will give several example s of implementation of \nR-evolution for stabilizing theoretical prediction s in the OPE and QCD. You may find following references useful arXiv:0908.3 189\, arXiv:0803.4214.\n LAST-MODIFIED:20230127T203813Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090204T180000Z DTEND:20090204T200000Z DTSTAMP:20260828T094430Z UID:qi3vads71dnn9fkiikeie6fvrk@google.com CREATED:20090126T132010Z DESCRIPTION:Speaker: Wm. Michael Snow\, Indiana University\, Bloomington\nT itle: A More Sensitive Search for Neutron -Antineutron Oscillations LAST-MODIFIED:20230127T203625Z LOCATION:PHYS 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091026T160000Z DTEND:20091026T170000Z DTSTAMP:20260828T094430Z UID:d1bu7ssqm3r3gc47ptuchuaqoc@google.com CREATED:20091015T182647Z DESCRIPTION:Title : AppEl Seminar - Directed energy recharge and flexible p ower for unmanned aerial vehicles (UAVs) \nSpeaker Name: Mario Dagenais \nS peaker Institution : UMD - ECE\nNotes: Bring your lunch. Beverages will be provided.\n LAST-MODIFIED:20230127T203731Z LOCATION:1207 Energry Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130204T173000Z DTEND:20130204T183000Z DTSTAMP:20260828T094430Z UID:41a19v5mm6p7g4bbg0qmmm2ihc@google.com CREATED:20130116T170823Z DESCRIPTION:Speaker: Katja Nowack\, Stanford University \nTitle: Imaging c urrents in HgTe quantum wells in the quantum spin Hall regime\nAbstract:Cou nter-propagating spin-polarized edge channels at the sample boundaries are a key feature of the quantum spin Hall (QSH) state\, which was predicted [1 ] and experimentally demonstrated [2] to exist in HgTe quantum wells. The e xistence of the edge channels has been inferred from transport measurements on sufficiently small devices\, which find local [2] and non-local [3] con ductance values close to the quantized values expected for ideal edge chann els and recently signatures of the spin polarization [4]. Devices with edge s longer than several micrometer show significant deviations from the ideal behavior. The robustness of the edge channel in large devices and the in terplay between the edge channels and a conducting bulk are experimentally largely unexplored and are difficult to assess via transport measurements. I report images of the transport current in large Hall bars by probing the magnetic field generated by the current using a scanning superconducting qu antum interference device (SQUID).\nWe directly visualize that the current flows along the edge of the device in the QSH regime. We show that an ident ifiable edge channel exists even in the presence of considerable bulk condu ction as the device is gated and its temperature is raised. Our results est ablish a versatile method for the characterization of new quantum spin Hall materials systems and confirm both the existence and the robustness of the predicted edge channels.\n\n[1] B. A. Bernevig\, T. L. Hughes and S. C. Zh ang\, Science 314\, 1757–1761 (2006).\n[2] M. König et al.\, Science 318\, 766–770 (2007).\n[3] A. Roth et al.\, Science 325\, 294–297 (2009).\n[4] C. Brüne et al.\, Nature Physics 8\, 485–490 (2012). LAST-MODIFIED:20230127T203852Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar-Katja Nowack TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100914T200000Z DTEND:20100914T210000Z DTSTAMP:20260828T094430Z UID:li7q5lrvsr8m8kvvqv7qcasbgc@google.com CREATED:20100825T173644Z DESCRIPTION:Speaker: John Wilkerson\, University of North Carolina\nTitle: The Reticent Yet Remarkable Neutrino LAST-MODIFIED:20230127T203557Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120214T190000Z DTEND:20120214T200000Z DTSTAMP:20260828T094430Z UID:ot14iif9c3evnm3a0m7l9t6sng@google.com CREATED:20120206T191133Z DESCRIPTION:Title : Supersymmetry Searches at ATLA\nSpeaker Name: Stephanie Majewski\nSpeaker Institution : Brookhaven National Laboratory\nAbstract : I will present the results of searches for Supersymmetry at ATLAS using 1- 2 fb^{-1} of sqrt(s) = 7 TeV data from the LHC\, focusing on the all-hadron ic signature of jets + missing transverse momentum. Stringent limits are se t on squark and gluino production. However\, "natural" SUSY suggests that t hird-generation squarks may be within reach. Recent results and an outlook for dedicated stop and sbottom searches will be discussed LAST-MODIFIED:20230127T203544Z LOCATION:1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130128T164500Z DTEND:20130128T173000Z DTSTAMP:20260828T094430Z UID:o3h6en5ue182g5b51rjqdogstc@google.com CREATED:20130116T165526Z LAST-MODIFIED:20230127T203309Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221130T180000Z DTEND:20221130T190000Z DTSTAMP:20260828T094430Z UID:28o16o1e09c741u0et4a5nk69u@google.com CREATED:20221116T170346Z DESCRIPTION:Title: \; Using nonlocal games to verify quantum advantage
      Speaker: \; \;Nishant Rodrigues (QuICS)
      Time:  \; \;Wednesday\, November 30\, 2022 - 1:00pm
      Location: \; \; ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

      In this talk\, I will give a brief introduction to nonlocal games\, follow ed by a discussion on the results from [1]. In this paper Kalai et al. show a connection between nonlocal games and classical verification of quantum advantage. Specifically\, they construct a framework for compiling a k-prov er nonlocal game into a single-prover interactive game. They use quantum ho momorphic encryption to simulate the spatial separation that is required in nonlocal games\, and then use the gap between the classical and quantum wi nning probabilities of the nonlocal game to verify quantum advantage.
      References:  \;[1] Kalai\, Yael\, et al. "Quantum Advantage from Any Non-Local Game." arXiv preprint arXiv:2203.15877 (2022).       LAST-MODIFIED:20221118T143456Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Nishant Rodrigues TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111013T180000Z DTEND:20111013T193000Z DTSTAMP:20260828T094430Z UID:d0tv3eie87ffpqcl2kffrt674g@google.com CREATED:20110914T203027Z DESCRIPTION:Speaker\, Title and Abstract: TBD LAST-MODIFIED:20230127T203831Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221111T170000Z DTEND:20221111T180000Z DTSTAMP:20260828T094430Z UID:4jo449mdrlvkllgbcm6l3vldq7@google.com CREATED:20221104T181635Z DESCRIPTION:Title: A quantum prediction as a collection of knowledge-restr icted classical predictions\nSpeaker: Billy Braasch (NIST and QuICS)\nTime : Friday\, November 11\, 2022 - 12:00pm\nLocation: ATL 2324\nAuthors: Bil ly Braasch and William K. Wootters\n\nHow are the phenomena of quantum theo ry novel when compared to those of a classical theory? Spekkens has introdu ced a classical model that reproduces a host of phenomena that appear in qu antum mechanics such as noncommutation\, interference\, and teleportation. The model is constructed as a classical theory where agents have restricted knowledge about the underlying states. While the model captures many aspec ts of quantum theory\, it cannot capture all. Here we show how it requires only a single augmentation to give quantum theory for certain systems. Spec ifically\, one must combine all possible knowledge-restricted classical acc ounts of a quantum experiment. The rule for combination is simple\, yet cur ious.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20221104T181635Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Billy Braasch TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100720T190000Z DTEND:20100720T203000Z DTSTAMP:20260828T094430Z UID:rhoi09007hmligg7878jvvo1ic@google.com CREATED:20100719T154211Z DESCRIPTION:[Title] "Infrared Anomalous Hall Effect in CaxSr1-xRuO3"\n[Spea ker] Myoung-Hwan Kim\n[Institution] Department of Physics\, University at B uffalo\, SUNY\n[Abstract] The dc anomalous Hall effect (AHE) is observed in many itinerant ferromagnets\, but its origin which is intrinsic or extrins ic is still not resolved in many cases. The complex Hall (H)\, Faraday (F )\, and Kerr (K) angles\, as well as the Hall conductivity (xy) in CaxSr1 -xRuO3 films are measured in the mid- and near-infrared energy range (115 – 1400 meV). The temperature and frequency dependence of the Hall effect is explored. For SrRuO3\, the AHE behavior above 200 meV is consistent with pr edictions from a band calculation for the intrinsic AHE. The temperature an d energy dependence of the measured Hall effect below 200 meV suggests that the extrinsic AHE may play an important role in the lower-energy response. As Ca composition increases\, the Hall conductivities show systematic shif ts in magnitude at low energies. On the other hand\, at high energies they are less sensitive to Ca composition. These results will provide the opport unity to test the band structure of CaxSr1-xRuO3 and theoretical models of the energy dependent AHE.\n[Host] Prof. Dennis Drew LAST-MODIFIED:20230127T203107Z LOCATION:0360 CNAM Conference Room in Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:A Special CNAM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110929T180000Z DTEND:20110929T193000Z DTSTAMP:20260828T094430Z UID:3dkrjefdth4hfa7nneb7dqg6ag@google.com CREATED:20110914T202824Z DESCRIPTION:Speaker: Jean-Philippe Reid\, University of Sherbrooke\nTitle: Probing exotic ground states with thermal conductivity\nAbstract: Therma l conductivity is a powerful technique to probe any quantum materials. As a n example\, for a superconductor\, the only non-zero transport measurement in the superconducting state is the thermal conductivity\, which gives acce ss to the underlying physics of this phase. In this talk\, I will present t wo projects on heavy fermion and iron-based superconductors materials probe d by thermal conductivity. \n\nFor the heavy fermion YbRh2Si2 [1] and CeCoI n5 [2]\, we were able to study the physical properties near the Quantum Cr itical Point (QCP) of these materials. For the Iron-based superconductors\, by using thermal conductivity as a directional probe of the superconductin g gap structure\, we were able to get insight on the pairing mechanism of t he materials K-Ba122 [3\,4]\, Co-Ba122 [5\,6]\, LiFeAs [7] and FeSeTe [8]. Indeed\, we observed a general trend for the evolution of the superconducti ng gap with doping. At optimal doping\, the gap structure is nodeless and i sotropic (3D). Away from optimal doping\, nodes appear on the Fermi surface at the edges of the superconducting dome\, as seen for Co-Ba122 and K-Ba12 2.\n\n\n[1] J.-Ph. Reid et al. - Unpublished\n[2] J. Paglione et al. - Unpu blished \n[3] X. G. Luo\, et al. - PRB 80\, 140503(R) (2009)\n[4] J.-Ph. Re id et al. - arXiv : 1105:2232\n[5] M. A. Tanatar\, et al. - PRL 104\, 06700 2\n[6] J.-Ph. Reid et al. - PRB 82\, 064501 (2010)\n[7] M. Tanatar\, et al. - arXiv : 1104.2209\n[8] J.-Ph. Reid et al. - Unpublished\n\n LAST-MODIFIED:20230127T203135Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101123T210000Z DTEND:20101123T220000Z DTSTAMP:20260828T094430Z UID:f85ii4bqhttafli48u6md5u6l4@google.com CREATED:20100825T175442Z DESCRIPTION:Speaker: Robijn Bruinsma\, University of California - Los Angel es\nTitle: "Statistical Mechanics and Virus Assembly"\nAbstract:\n"The asse mbly of a virus can be replicated in a controlled environment\nunder condit ions that are close to thermodynamic equilibrium. This\nsuggests that the m ethods and concepts of statistical mechanics and\nthermodynamics might be a pplicable and informative for the analysis of the\nspontaneous self-assembl y of viruses. In the seminar\, some of the\nsuccesses and failures of apply ing concepts borrowed from equilibrium and\nnon-equilibrium statistical mec hanics to viral assembly\, such as the Law\nof Mass Action and the Gibbs-Th ompson effect will be discussed\, as well as\noutstanding riddles." LAST-MODIFIED:20230127T203223Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090429T170000Z DTEND:20090429T190000Z DTSTAMP:20260828T094430Z UID:pgdhfp888m104m5gtk3978avts@google.com CREATED:20090304T183143Z DESCRIPTION:Title: The J-PARC/MSL and the Development of the Super-Omega Mu on Beamline\nSpeaker: Kazutaka Nakahara\, KEK High Energy Accelerator Resea rch Organization\, Japan\nMore Information: Abstract: The Materials and Li fe Science Facility (MLF) is currently under construction at the Japan Prot on Accelerator Research Complex (J-PARC) in Tokai\, Japan. The muon section of the facility houses the production target and four secondary beamlines used to transport muon beams of different energies and intensities into two experimental halls. One of the secondary beamlines is the Super-Omega Muon Beamline\, which when completed\, will produce the world's most intense pu lse muon beam. In this seminar\, I will describe the various physics progra ms expected to take place at J-PARC/MSL\, the development of a high intensi ty pulsed muon beam at the Super-Omega Muon Beamline. LAST-MODIFIED:20230127T203358Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221118T170000Z DTEND:20221118T180000Z DTSTAMP:20260828T094430Z UID:2uhjih9rde4am7c5l5eidpij42@google.com CREATED:20221111T212241Z DESCRIPTION:Title: Exploring one-dimensional Z2 lattice gauge theories wit h dynamical matter\nSpeaker: Matjaž Kebrič (LMU Munich\, Germany)\nTime: Friday\, November 18\, 2022 - 12:00pm\nLocation: ATL 2324\n\nAlthough latt ice gauge theories are primarily considered in particle physics\, they are also a valuable platform to study strongly correlated quantum systems in co ndensed-matter physics. Particularly interesting is the study of confinemen t\, which can arise when dynamical charges are coupled to gauge fields. In this talk\, I will present our recent work on a one-dimensional Z2 lattice gauge theory (LGT)\, where dynamical matter is coupled to Z2 gauge field [1 ]. This results in a non-local linear confining potential between particle pairs\, that can be probed by considering a Z2 invariant Green'\;s funct ion [2] and performing DMRG calculations. We solve the confinement problem by performing a non-local basis transformation and relate confinement to tr anslational symmetry breaking in the new basis. In addition\, we also study phase diagrams of the model at different fillings and uncover rich physics [3]. Our study is also partially motivated by recent advancements in cold atom simulation. The one-dimensional Z2 LGT can be directly related to a on e-dimensional t-Jz model\, which means that it is already within the reach of the current experimental setups. In addition\, it can also offer deeper physical understanding of the phenomena in t-J models.\n\n[1] Kebrič et al. \, Phys. Rev. Lett. 127\, 167203 (2021)\n[2] Borla et al.\, Phys. Rev. Lett . 124\, 120503 (2020)\n[3] Kebrič et al.\, arXiv: 2206.13487\, (2022)\n\n(P izza and refreshments will be served after the talk.) LAST-MODIFIED:20221111T212241Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Matjaž Kebrič TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110131T160000Z DTEND:20110131T170000Z DTSTAMP:20260828T094430Z UID:3c15og155gacqn3a11kk8pi75g@google.com CREATED:20110120T143150Z DESCRIPTION:Title: TBA\nSpeaker: Benjamin Shapiro\nAssociate Professor\nFis chell Department of Bioengineering\nUniversity of Maryland\, College Park LAST-MODIFIED:20230127T203359Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221104T150000Z DTEND:20221104T160000Z DTSTAMP:20260828T094430Z UID:3lrem1kvotlofdngehesfc5g73@google.com CREATED:20221031T153323Z DESCRIPTION:PhD Defense

      Speaker: Charlotte Wentz\, UMCP

      Advis or: Dr. Lawrence Sita\, UMCP

      Title: \;Design and Synthesis of Polyolefin Materia ls for Nanostructured Self-Assembly: Building Blocks\, Copolymers and Polym er Conjugates LAST-MODIFIED:20221031T153323Z LOCATION:A.V. Williams Building\, Room 2460 & Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091002T100000 DTEND;TZID=America/New_York:20091002T120000 DTSTAMP:20260828T094430Z UID:scetugf65ssu31ro1cjts1dh9c@google.com RECURRENCE-ID;TZID=America/New_York:20091002T100000 CREATED:00010101T000000Z DESCRIPTION:SPIN PHYSICS & PHASE TRANSITIONS\nStephen Powell\, Unconvention al classical phase transitions\nDimi Culcer\, Spin qubits in multivalley Si quantum dots\nVictor Galitski\, Topological phases in cold atom systems\nV ictor Yakovenko\, “Theories of the time-reversal symmetry breaking and the Kerr\neffect in Sr2RuO4 and underdoped cuprates”\nhttp://www.physics.umd.ed u/cmtc/seminars.html\n\n LAST-MODIFIED:20230127T202959Z LOCATION:PHYS 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110215T181500Z DTEND:20110215T193000Z DTSTAMP:20260828T094430Z UID:4ttdbsc5vkk99ovjkkb3pq2dt8@google.com CREATED:20110203T160141Z DESCRIPTION:Title : Principles of Active Transport in Filopodia\nSpeaker Na me: Dr. Garegin Papoian\nSpeaker Institution : University of Maryland Colle ge Park\nNotes: As in the past\, each seminar will be preceded by an INFORM AL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 abou t five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T203523Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statsitcal Mechanics Physics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221024T150000Z DTEND:20221024T160000Z DTSTAMP:20260828T094430Z UID:59ihbng031vbre7urs8c3nph7k@google.com CREATED:20220830T164427Z DESCRIPTION:Speaker: Ido Kaminer\, Technion - Israel Institute o f Technology


      Title : \;Quantum Optics with Free Electrons

      Abstract: \;Until recently\, work in quantum optics focused on light inte racting with bound-electron systems such as atoms\, quantum dots\, and nonl inear optical crystals. In contrast\, free-electron systems enable fundamen tally different physical phenomena\, as their energy distribution is contin uous and not discrete\, allowing for tunable transitions and selection rule s.
      We have developed a platform for studying free-electron quantu m optics at the nanoscale\, and recently used it to demonstrate key phenome na of this emerging field: the first coherent interaction of a free electro n with a photonic cavity and with the quantum statistics of photons.
      These capabilities open new paths toward using free electrons as carriers of quantum information. Free electrons emerge as quantum optical sources f or desired continuous-variable photonics states used in fault-tolerant quan tum computation and communication.

      Our experiments bring us to envi sion a new modality in electron microscopy – imaging coherence – which goes beyond conventional imaging of matter\, to also image the coherent quantum state of matter and quantum correlations between individual quantum system s. LAST-MODIFIED:20221021T181449Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Ido Kaminer TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091202T170000Z DTEND:20091202T183000Z DTSTAMP:20260828T094430Z UID:uafbqmuk9mu9fvq255e05s23v8@google.com CLASS:PUBLIC CREATED:20091104T141748Z DESCRIPTION:Title: Space-Time Reduction of Large-N Gauge Theories\nSpeaker : Barak Bringoltz\nAffiliation: University of Washington\, Seattle\n\nAbstr act: Space-time reduction is a remarkable property of large-N gauge theorie s that allows one to perform lattice simulations on very small volumes. I p lan to explain this idea\, review its history\, and discuss recent developm ents in the context of gauge theories with fermions in high representations of the gauge group. Such theories are of relevance to QCD and to physics w hich is beyond the standard model.\n LAST-MODIFIED:20230127T203634Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Semianr (NOTE START TIME) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090216T210000Z DTEND:20090216T220000Z DTSTAMP:20260828T094430Z UID:541tb36hpn8aeutrtsv7fn4sjo@google.com CREATED:20090204T155119Z DESCRIPTION:Speaker: Professor Sergei Sukharev\, Department of Biology\, UM CP\nTitle: Surfaces and boundaries in the mechanosensitive channel gating LAST-MODIFIED:20230127T203036Z LOCATION:IPST Building\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100225T190000Z DTEND:20100225T200000Z DTSTAMP:20260828T094430Z UID:hcs2bp9e8ktpi07rs9h0hhpo7k@google.com CREATED:20100218T165801Z DESCRIPTION:[Speaker] W. Vincent Liu\n[Institution] University of Pittsburg h\n[Title] Exotic superfluidity of spin imbalanced\nfermions: from three to one dimension\n[Abstract] A number of condensed matter concepts and models have been explored in cold atomic systems\, which provide a highly control lable environment. One such system is spinimbalanced fermions. In this talk \, I will report some of its intriguing properties. In 3D\, the combined ef fect of Fermi surface mismatch and mass imbalance creates the\npossibility of discovering a new kind of pairing state---breached pair superfluidity (B P)\, conceptually different than the well-known BCS and Fulde-Ferrell-Larki n-Ovchinnikov\n(FFLO) phases. Novel unique features as well as some numeric al evidences of the state will be discussed. In 1D\, the effect of spin imb alance is also remarkable. Spin-charge\nseparation previously known as the characteristic of electrons in one-dimensional solids does not occur. A fir st correct effective model of the Tomonaga-Luttinger liquid type is\nconstr ucted for arbitrary spin polarization from Bethe ansatz and conformal field theory. Dimensional crossover is then analyzed by renormalization group. T owards exact\nsolutions\, I will report a breakthrough in simplifying coupl ed thermodynamic Bethe ansatz (TBA) integral equations\, whose physics is e xact but notoriously difficult to\nunderstand. The simplified TBA equations provide a precise understanding of the 1D system at strong attractive inte raction and relatively low temperature and yet are simple\nenough to be mas tered by non-experts comparing with experiments.\nHost: Michael Fuhrer\n[No te] Refreshment is serviced at 1:30pm in the Toll Room LAST-MODIFIED:20230127T203726Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230113T160000Z DTEND:20230113T170000Z DTSTAMP:20260828T094430Z UID:13qpo1h9ouht4kc6t1fpsufcp8@google.com CREATED:20230106T210253Z DESCRIPTION:Speaker: Kartiek Agarwal (McGill University)

      Title: Quantum many-body scars\, connection to Floquet automata\, and ‘broken unit ary’ dynamics

      Abstract: Quantum Many-Body scars represent a new paradigm of breaking eigenstate thermalization hypothesis—a vanishing numbe r of states in the spectrum exhibit area law entanglement while being dispe rsed at equally spaced energies throughout a spectrum of volume-law entangl ed states. This is in stark contrast to many-body localization\, where all eigenstates are area-law entangled\, or a thermalizing system\, where state s are volume law entangled. Despite the fact that very few states exhibit s uch low entanglement\, they have a remarkable effect on the dynamics of the system. In particular\, when the system is prepared in certain initial sta tes\, it refuses to thermalize up to extremely long times\, exhibiting peri odic revivals of the initial state. Such physics was first discovered in th e PXP model\, but appears to be present in the AKLT model\, generalizations of the Hubbard model\, among others. In this talk\, I will discuss how one can understand the presence of such low-entanglement mid-spectrum states b y relating these strongly interacting models with non-trivial dynamics\, to very simple Floquet systems governed by classical automaton dynamics. This connection helps us understand the emergence of non-thermalizing subspaces in this system due to the formation of certain non-local integrals of moti on\, and allows one to extract an approximate timescale for the decay of th e many-body recurrences. We also discuss how these ideas can be leveraged t o realize new Hamiltonians that exhibit quantum scars\, and for which the t imescale of the decay recurrences can be tuned from fairly short times to i nfinite. We further generalize these ideas using a novel ‘broken unitary’ i nterpretation of quantum scar dynamics.

      Hosts: Garnett Bryant an d Michael Gullans LAST-MODIFIED:20230106T210543Z LOCATION:PSC 2136 and virtual via zoom: https://umd.zoom.us/j/2821742741?pw d=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Kartiek Agarwal (McGill University) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101206T173000Z DTEND:20101206T183000Z DTSTAMP:20260828T094430Z UID:7sa52e5shnku2m72f17ckpoqso@google.com CREATED:20100825T185818Z DESCRIPTION:Title: TBA\nSpeaker: Markus Greiner\, Harvard University\nAbstr act: TBA LAST-MODIFIED:20230127T203326Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081209T183000Z DTEND:20081209T193000Z DTSTAMP:20260828T094430Z UID:ao9454s1lg7mebjo0pmaocqha4@google.com CREATED:20081208T214241Z DESCRIPTION:Speaker: Prof. E.F. (Joe) Redish\, Department of Physics\, Univ ersity of Maryland\n\nTitle: Math is the language of science and engineerin g – or is it? LAST-MODIFIED:20230127T203410Z LOCATION:epco Room (1105)\, Kim Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Engineering Education Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110202T151500 DTEND;TZID=America/New_York:20110202T161500 DTSTAMP:20260828T094430Z UID:s993q09t5car86fl85fshukqa8@google.com RECURRENCE-ID;TZID=America/New_York:20110202T151500 CREATED:00010101T000000Z DESCRIPTION:Speaker: Aron Wall (University of Maryland)\n\nTitle: A Quantum Singularity Theorem\n\nAbstract: In classical general relativity\, the Pen rose singularity\ntheorem tells us that black holes must have singularities inside of\nthem. However\, the result does not apply to quantum spacetime s\, which\ncan have negative energy densities. I will describe how the\nge neralized second law (GSL) can be used to prove a singularity\ntheorem even for quantum black holes. Depending on the interests of\nthe audience\, I may also discuss how the GSL applies to the big bang\nsingularity\, baby un iverses\, traversable wormholes\, warp drives\, time\nmachines\, and negati ve mass objects. This is intended to be an\ninformal\, interactive blackbo ard talk explaining arXiv:1010.5513.\n LAST-MODIFIED:20230127T203416Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081014T171500Z DTEND:20081014T181500Z DTSTAMP:20260828T094430Z UID:4babamge55gbcb2kic6j8rra5k@google.com CREATED:20081008T173145Z DESCRIPTION:Title: What Can We Learn From Molecular Simulations of Lipid Bi layers?\nSpeaker: Jeffrey Klauda\, UMCP\nMore Information: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon ).\nContact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\n301-405-4 439\nProfessor John Weeks\, jdw@ipst.umd.edu\n301-405-4802 LAST-MODIFIED:20230127T203524Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120510T173000Z DTEND:20120510T180000Z DTSTAMP:20260828T094430Z UID:c4sipqf8jg6cqfra03pknat18o@google.com CREATED:20120419T152047Z LAST-MODIFIED:20230127T203732Z LOCATION:Room 1305F (the "new" Toll Room) Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120402T154500Z DTEND:20120402T163000Z DTSTAMP:20260828T094430Z UID:9cveqedtl468knsauhs53adhv8@google.com CREATED:20120327T123610Z LAST-MODIFIED:20230127T202934Z LOCATION:1305 F New Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120910T160000 DTEND;TZID=America/New_York:20120910T173000 DTSTAMP:20260828T094430Z UID:hnadaorlddcltr38mnfecutk70@google.com RECURRENCE-ID;TZID=America/New_York:20120910T160000 CREATED:20120904T140915Z DESCRIPTION:Title : Seeing the Unseen in Cell Machinery by Label-Free Spect roscopic Imaging\nSpeaker Name: Professor Ji-Xin Cheng\nSpeaker Institution : Purdue University\nNotes: Refreshments served at 3:45pm LAST-MODIFIED:20230127T203255Z LOCATION:Room 1103\, Bioscience Research Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221206T180000Z DTEND:20221206T193000Z DTSTAMP:20260828T094430Z UID:5g0ec1hjdr03cdof3ogdbb9rqg@google.com CREATED:20220920T114952Z DESCRIPTION:Speaker: Professor Peter Bolhuis\, University of Amsterdam

      Title: \;A Maximum Caliber Approach for Tuning Mol ecular Kinetics

      Abstract: \;Empirical force fields used in Molecular Dynamics simulati ons of complex biomolecules and materials are often approximate. Statistica l methods based on the maximum-entropy principle are able to increase the a ccuracy of “structural and thermodynamical ensembles” obtained by such mole cular dynamics simulations through incorporating experimental information. One would like to go even further\, by obtaining ‘kinetic ensembles’\, comp rising the structures of the different states of a molecular system\, their populations and their interconversion rates. However\, up to recently ther e was no systematic way to incorporate experimental dynamical and kinetic i nformation into molecular dynamics simulations. We developed a method of im posing known rate constants (and other dynamical observables) as constraint s in molecular dynamics simulations\, based on a combination of the maximum -entropy (MaxEnt) and maximum-caliber principles (MaxCal) [1]. Starting fro m an existing ensemble of (rare event) dynamical trajectories or paths\, e. g. obtained from transition path sampling\, each path is reweighted in orde r to match the calculated and experimental interconversion rates of a molec ular transition of interest\, while minimally perturbing the prior path dis tribution. This kinetically corrected ensemble of trajectories leads to imp roved structure\, kinetics\, thermodynamics\, free energy landscapes\, as w ell as mechanistic insights that may not be readily evident directly from t he experiments. Finally\, the MaxCal approach can also be used to fine-tune the molecular force fields themselves\, and might provide an efficient mea ns for designing kinetic behavior [2].

       \;

      [1] Z. F. Brotzakis\, M. Vendruscolo\, and P. G. Bolhuis\, Proc. Nat l. Acad. Sci. 118\, (2020).

      [2] P. G. Bolhuis\, Z. F. Brotz akis\, and B. G. Keller\, arXiv:2207.04558 (2022).

      LAST-MODIFIED:20221130T183522Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20230126T161500Z DTEND:20230126T173000Z DTSTAMP:20260828T094430Z UID:6gdmijg9snkui21o195heimvr8@google.com CREATED:20230120T192837Z DESCRIPTION:Title:  Discuss career progression and opportunities for young researchers
      Speaker:  Zlatko Minev (IBM)
      Time:  Thursday\, January 26 \, 2023 - 11:15am
      Location:  PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/5942646305

      Zlatko Minev is the technical lead and manager of the following groups at I BM Quantum - Qiskit Leap (quantum computing research) and Qiskit Metal (qua ntum hardware). His background is in experimental and theoretical quantum c omputing\, software\, fundamental and applied physics. Meet him for an info rmal chat about Quantum-related industry opportunities and his career progr ession. LAST-MODIFIED:20230120T193101Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/5942646305 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Career Talk: Zlatko Minev TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100930T140000 DTEND;TZID=America/New_York:20100930T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20100930T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] µ-Spec – A New Tool for Probing the Early Universe\n[Sp eaker] Harvey Moseley\n[Institution] Laboratory for Observational Cosmology NASA/GSFC\n[Abstract] The great success of COBE and WMAP\, along with a nu mber of pioneering balloon-based and ground-based experiments have produced a remarkably consistent view of the early universe up to the formation of the Cosmic Microwave Background radiation. Subsequent CMB experiments are measuring its small scale structure to reveal the growth history of mass c ondensations in the universe through gravitational lensing of the CMB.\n While these measurements will measure the mass distrbution over cosmic t ime\, we need to understand what the baryons are doing. They are a small co nstituent by mass\, but their development defines the universe we see. We are developing an instrument concept for flight on the Japanese SPICA miss ion\, a cryogenically cooled 3-m telescope\, that will allow us to observed the physical conditions in early galaxies and to measure the growth in con centrations of the abundant elements\, C\, N\, and O over Cosmic time. Our instrument\, µ-Spec\, operating in the 250 -700 µm spectral region\, will also be a powerful tool for studying the energy balance of the gas in our Galaxy\, allowing us to observe the emission from hydrides\, which probe t he dense regions of clouds\, to CO lines that measure the cooling and radi ation field in the lower density material.\n µ-Spec combines a number o f new technologies to enable the production of compact high performance sub millimeter spectrometers. First\, we use low loss superconducting transmis sion lines to create the analog of a grating spectrometer in a volume thous ands of times smaller than in conventional instruments. This configuratio n allows convenient coupling to the large arrays of detectors required for the instrument in a very small volume. We are also developing detectors f or this instrument that have sufficient sensitivity to allow us to reach th e limits set by input photon statistics\, around 10-20 W/√Hz for our spectr ometer. Ultimately\, the photon rates are sufficiently low that photon cou nting may provide significant stability benefits\, so we are also exploring designs that will allow counting of individual 1 THz photons.\n I will describe our development efforts on both the integrated spectrometer and t he detector. The photon counting detector is a very exciting possibility\, and promises to have significant applications in a wide range of applicati ons from cosmology to quantum information experiments. \n[Note] Refreshment is served at 1:30pm in room 1305F (new Toll Room). LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091119T171500Z DTEND:20091119T181500Z DTSTAMP:20260828T094430Z UID:b86u920pp2ao6sd9nq68q2qj8c@google.com CREATED:20091015T202832Z DESCRIPTION:Title :Blowing in the Wind: Aeolian Patterns\nSpeaker Name: W illem van de Water\nSpeaker Institution : Eindhoven University\, The Nether lands LAST-MODIFIED:20230127T203910Z LOCATION:1207 Energy Research Faciltiy SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T180000Z DTEND:20221116T190000Z DTSTAMP:20260828T094430Z UID:71d6unbtqvbba0kp56otu6temv@google.com CREATED:20221110T003706Z DESCRIPTION:Title:  Position Verification with Classical Communication
      S peaker:  Yusuf Alnawakhtha (QuICS)
      Time:  Wednesday\, November 16\, 2022 - 1:00pm
      Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344

      Position verifi cation is the task of verifying the geographical position of a party using computational tasks and physical bounds on the speed of communication. It h as been shown that position verification is impossible in the classical set ting\, but using non-clonability it is shown that one can construct quantum position verification (QPV) schemes. These schemes are secure against any individual attacker\, but can be broken by colluding attackers that share a large amount of entanglement.

      In this talk\, we will go over a rece nt quantum position verification protocol developed by Jiahui Liu\, Qipeng Liu\, and Luowen Qian. We will discuss how they use trapdoor claw-free func tions to replace quantum communication channels in QPV protocols with class ical channels. We will also discuss entanglement lower-bounds required to b reak the protocol and give some insight into possible future directions in QPV.

      Reference: Liu\, Jiahui\, Qipeng Liu\, and Luowen Qian. "\; Beating Classical Impossibility of Position Verification."\; arXiv:2109 .07517 (2021). LAST-MODIFIED:20221110T003706Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96508005344 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QCCC Seminar: Yusuf Alnawakhtha TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131202T160000Z DTEND:20131202T173000Z DTSTAMP:20260828T094430Z UID:j5a4knb6jgv9o28httu9tgav28@google.com CLASS:PUBLIC CREATED:20130911T142640Z DESCRIPTION:Edwin Barnes\n \nTitle :\nTwo-level quantum dynamics revisited: New classes of solutions for the old Landau-Majorana-Stueckelberg-Zener pr oblem\n \nAbstract:\nAnalytical solutions to the time-dependent Schrodinger equation describing a driven two-level system are invaluable to many areas of physics\, but they are also rare. I will present a simple algorithm bas ed on a type of partial reverse-engineering that generates an unlimited num ber of exact analytical solutions for a general time-dependent Hamiltonian. The method will be demonstrated with several new exact solutions that are particularly relevant to qubit control in quantum computing applications. I will further show that our formalism easily generates analytical control p rotocols that execute perfect Landau-Majorana-Stueckelberg-Zener interferom etry and rapid adiabatic passage near the quantum speed limit.\n \nBrian Ne yenhuis\n \nTitle:\nUltrafast creation of Schrodinger-Cat States of Motion in a Single Atom\n \nAbstract:\nTrapped atomic ions allow us to build up st rongly interacting quantum systems one atom at a time. The internal energy levels of the ion are used to represent a spin ½ system and contain a quan tum bit (qubit) of information. By applying state-dependent optical dipole forces to the chain of ions we control spin-spin couplings and can enginee r interesting Hamiltonians. I will present a new method using ultrafast las er pulses to entangle pairs of ions. We engineer a short train of intense l aser pulses to impart a spin-dependent kick\, where each spin state receive s a discrete momentum kick in opposite directions. We have realized spin-de pendent kicks with a fidelity greater than 99.8%. Using a series of these s pin-dependent kicks we can realize a two qubit gate. In contrast to gates u sing spectroscopically resolved motional sidebands\, these gates may be per formed faster than the trap oscillation period\, making them potentially le ss sensitive to noise\, independent of temperature\, and more easily scalab le to large crystals of ions. Multiple kicks can be strung together to crea te a “Schrodinger cat” like state\, where the large separation between the two parts of the wavepacket allow us to accumulate the phase shift necessar y for a gate in a shorter amount of time. We have realized kicks with 38ħk of momentum separation in a single trapped atom. I will present a realistic pulse scheme to extend this technique to two ions for an entangling gate\, and our progress towards its realization.\n \nStephen Eckel\n \nTitle: Hys teresis in a quantized\, atomtronic circuit\n \nAbstract:\n \nHysteresis is a common feature of superconducting circuits like the superconducting quan tum interference device (SQUID)\, which is one of the world's most sensitiv e magnetometers. We are working to realize a neutral atom circuit that is analogous to the rf-SQUID\, but is sensitive to rotation rather than magnet ic fields. Our analog consists of a toroidally-shaped\, Bose-Einstein cond ensate that is stirred by a rotating repulsive potential that serves as a w eak link. The weak link induces phase slips in the superfluid between well -defined persistent current states. We have recently observed hysteresis i n these transitions: the rotation frequency at which the phase slips occur changes\, depending on whether the phase slip results in an increase or dec rease of the persistent current. Beyond the present application of a rotat ion sensor\, this hysteresis may prove useful in atomtronic circuits that a re analogous to hysteretic electronic circuits (e.g.\, memory).\n \nPresen tation will be for 25 minutes and 5 minutes for questions.\n LAST-MODIFIED:20230127T203944Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Post-doc extravagana TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131112T210000Z DTEND:20131112T220000Z DTSTAMP:20260828T094430Z UID:vnr0iqgkf1v6uj0oaoslpnjk1s@google.com CREATED:20130919T181553Z DESCRIPTION:Title: The other-worldly career of Freeman Dyson\nSpeaker: Phi llip Schewe\, University of Maryland\nAbstract: Freeman Dyson is not one m an but ten. Apart from his critical work on quantum electrodynamics Dyson h as been involved in designing nuclear reactors and rocketships\, in securin g a limited test ban treaty and keeping tactical nuclear weapons out of Vie tnam\, in proposing a novel theory for the origin of life\, and in launchin g the search for extraterrestrial intelligence. He helped create adaptive optics and originated the study of the cosmos in the distant future. Dyson is also an outspoken speaker on topics such as climate change\, biotechnol ogy\, and the prospective human migration into space. LAST-MODIFIED:20230127T205107Z LOCATION:Phys 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20111014T130000 DTEND;TZID=America/New_York:20111014T140000 DTSTAMP:20260828T094430Z UID:0g0fishv5cglmrqdqbhasef4lo@google.com RECURRENCE-ID;TZID=America/New_York:20111014T093000 CREATED:20110912T203059Z DESCRIPTION:Title : Working at the Interface: Hybrid Biological-Inorganic M aterials\nSpeaker Name: Lia Stanciu\nSpeaker Institution : Perdue Universit y\nAbstract : Abstract to be announced.\n LAST-MODIFIED:20230127T204348Z LOCATION:Location: Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY: Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120223T183000Z DTEND:20120223T190000Z DTSTAMP:20260828T094430Z UID:sla0n6hv5t8cg31v9ied7dbdh4@google.com CREATED:20120216T204718Z LAST-MODIFIED:20230127T204122Z LOCATION:Room 1305F (the new Toll Room) Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100503T130000Z DTEND:20100503T140000Z DTSTAMP:20260828T094430Z UID:rs2v76oko2a5laepss8pd5c7oo@google.com CREATED:20100428T191941Z DESCRIPTION:Title: Ultrasound as an Alternative Male Contraceptive\nName: M iriam S. Boer\, University of Maryland\, Biochemistry Dept. Graduate Studen t LAST-MODIFIED:20230127T204343Z LOCATION:Biomolecular Sciences Bldg. Room 2118 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131024T180000Z DTEND:20131024T193000Z DTSTAMP:20260828T094430Z UID:oug8dr7r0k6lofl83lbuc1b8i4@google.com CREATED:20131022T191703Z DESCRIPTION:Speaker: Gabriel Kotliar\, Rutgers University\n\nTitle: Iron P nictides and Chalcogenides: doped Mott insulators\, itinerant magnets or Hu nds metals ? \n\nAbstract: Since the discovery of the iron based supercond uctors\, there has been\nconsiderable discussion of the proper theoretical framework for describing these materials and the role played by electronic correlations. In this talk we will review a broad range\nexperimental studi es including transport\, optical and neutron spectroscopies\, together with some LDA+DMFT results for these compounds\, to outline a road to distingui sh between the various pictures. We will argue that these materials are cor related in a way that differs from the Mott Hubbard mechanism\, and discuss some implications for the orbital structure of their order parameter. \n\n There will not be a chalkboard talk.\n\nHost: Rick Greene LAST-MODIFIED:20230127T204709Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090421T171500Z DTEND:20090421T181500Z DTSTAMP:20260828T094430Z UID:18la3vr4cft4edomdftqc4o95k@google.com CREATED:20090413T144959Z DESCRIPTION:Title: Jamming\nSpeaker: Professor Andrea J. Liu\, Department o f Physics & Astronomy\, University of Pennsylvania\nMore Information: As in the past\, each seminar will be preceded by an Informal Cafeteria Lunch to which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon).\n\nFor further information contact:\nProfessor Christopher Ja rzynski\, cjarzyns@umd.edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd. edu\, (301)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)-405 -1610. LAST-MODIFIED:20230127T205138Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Stastical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120911T200000Z DTEND:20120911T210000Z DTSTAMP:20260828T094430Z UID:qj9e1clksv74m2t65e8n96gk9g@google.com CREATED:20120822T152346Z DESCRIPTION:Speaker: Arthur LaPorta\nInstitution: University of Maryland\nT itle: Single Molecule Experiments Reveal the Role that Energy Landscapes Pl ay in Biological Processes.\nAbstract: In biology\, the energy of a protein or nucleic acid molecule as a function of its physical conformation is of critical importance. It controls the folding of proteins into their native \, active conformations\, and it determines how much work processive enzyme s must do in order to access information stored in DNA or RNA sequences. I will describe a new technique we have developed for measuring the energy o f a DNA or RNA molecule as a function of its extension using an optical tra p. I will describe a theoretical framework we have developed for relating the energy as a function of extension to the energy as a function of confor mation\, which is more directly related to biological function. Finally\, I will describe what we have learned by applying this technique to several important biological systems. One example is an messenger RNA molecule whi ch forms a pseudoknot that is known to induce a ribosomal frame shift. The frame shift interferes with synthesis of a co-factor for HIV infection. M easuring the energy landscape for disruption of this molecule we have found that it occupies a statistical ensemble of conformations which provide dra matically different levels of resistance to disruption by a translating rib osome. Micro-RNA molecules that enhance the frame-shift efficiency in vivo are found to work by altering the statistical ensemble of the molecule. A nother molecule we have studied is a DNA G-quadruplex structure. G quadrup lex is a novel form of DNA in which a single strand organizes itself around planar quinine tetrads. G-quadruplex in the pre-transcribed regions of ge nes may couple torsional strain to gene expression levels\, and G-quadruple x in the human telomeric repeat sequence may play a role in the inhibition of telomerase. In our optical trap based studies\, we have found that G-qu adruplex in a highly cooperative structure which provides strong resistance to disruption by force\, but which is vulnerable to disruption by thermal fluctuations. These features have interesting implications for the competi tion between G-quadruplex and ordinary duplex DNA\, and for the ability of G-quadruplex to interfere with processive enzymes.\n LAST-MODIFIED:20230127T204716Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130214T190000Z DTEND:20130214T203000Z DTSTAMP:20260828T094430Z UID:j6697nu4nfdtmcb5buaqijm8sk@google.com CREATED:20130208T135730Z DESCRIPTION:Speaker: Kin Chung (KC) Fong\n\nTitle: Listening to graphene noise: Can we hear a single microwave photon?\n\nAbstract: Graphene is a m aterial with remarkable electronic properties. However its electronic therm odynamic properties are less explored. By listening to the noise from this atomically thin material sensitively\, we can study the interesting thermal physics of the two-dimensional Dirac Fermions in graphene at low temperatu re. Our measurements suggest that graphene-based devices can generate subst antial advances in the areas of ultra-sensitive bolometry\, calorimetry\, a nd microwave single photo-detection for applications in areas such as obser vational astronomy\, quantum information and measurement [1]. \n[1] K.C. F ong and K.C. Schwab\, Phys. Rev. X 2\, 031006 (2012) \n\nHost: Ian Appelbaum LAST-MODIFIED:20230127T204020Z LOCATION:Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cond. Matter Seminar w/ KC Fong TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100424T140000Z DTEND:20100424T200000Z DTSTAMP:20260828T094430Z UID:06071lrbterlmmfjcm3sm2duak@google.com CREATED:20100420T172715Z DESCRIPTION:http://www.umdphysics.umd.edu/marylandday LAST-MODIFIED:20230127T204633Z LOCATION:Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Maryland Day TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130325T163000Z DTEND:20130325T173000Z DTSTAMP:20260828T094430Z UID:adv8ughd1r9u1mhkqprbtjpq9g@google.com CREATED:20130116T181637Z DESCRIPTION:Title: Semiconductor and Graphene Quantum Dots\nInstitution:Nat ional Research Council of Canada\nAbstract: We review progress in theory an d experiments on semiconductor and graphene quantum dots with potential app lications in nanoelectronics\, nanospintronics\, nanophotonics and quantum information processing. We describe lateral quantum dot molecules with cont rolled electron numbers in each dot and discuss potential use of such a mol ecule as a building block of a field effect transistor with a macroscopic q uantum state\, and on-chip GHZ state and Berrys and topological phase gener ators. We next turn to hybrid systems of self-assembled semiconductor quant um dots containing single magnetic impurities. Such impurities can be thoug ht of as an atomic limit of quantum memory directly integrated into a semic onductor host. Finally\, we describe one atom thick semiconductor quantum d ots made of graphene. We show that their electronic\, optical and magnetic properties can be engineered by the size\, shape\, type of edge and number of layers. We focus on their optical and magnetic properties\, and their co ntrol with external gate\, electric field and photons. Possibility of reali zing a fully integrated carbon-only quantum circuit will be discussed.\n LAST-MODIFIED:20230127T204939Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Pawel Hawrylak TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130926T180000Z DTEND:20130926T193000Z DTSTAMP:20260828T094430Z UID:b329d7lb438om4c731sh2e05tc@google.com CREATED:20130916T185651Z DESCRIPTION:Speaker: Prof. Jing Xia\, University of California-Irvine\n\nT itle: "Surface transport in Topological Kondo Insulator SmB6"\n\nAbstract: In this talk we will discuss the existence of topological order in a 3D str ongly correlated material SmB6\, which has recently been proposed theoretic ally as a topological Kondo insulator. We will present transport evidence f or a highly conductive surface state surrounding a truly insulating bulk: A t low temperature We found that the Hall resistance scales with the surface \, and is independent of the thickness. Using non-local transport measureme nts\, we demonstrate that the electric conducting is mostly along the surfa ce at low temperatures and in zero magnetic field. At even lower temperatur es\, we demonstrate the weak localization effect\, which is consistent with a surface state with spin momentum locking. The Kondo-effect-like resistan ce saturation will also be discussed. \n\nHost: Victor Galitski LAST-MODIFIED:20230127T204734Z LOCATION:Phys Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100310T173000Z DTEND:20100310T183000Z DTSTAMP:20260828T094430Z UID:kcr8aqmqqjt49h8cleu59kt7s0@google.com CREATED:20100222T182742Z DESCRIPTION:SPEAKER: Jonathan Link\n\nAFFILIATION: Virginia Polytechnic In st. and State Univ.\, Blacksburg\n\nTITLE: Novel Uses of Low Energy Neutrin o Sources\n\nABSTRACT: \nMega-Curie electron capture neutrino sources have the potential to be among the most intense sources of neutrino flux. They have previously been used to calibrate the solar neutrino detectors Gallex and Sage. Advances in neutrino physics and detector technology have opene d up new possible uses for these sources. I will examine the prospects for producing mega-Curie scale sources in the US using the High Flus Isotope R eactor at Oak Ridge National Lab\, and I will outline two experiments that could be done with such sources: a sterile neutrino oscillation search usin g the LENS solar neutrino technology\, and a precision neutrino magnetic mo ment search using a liquid noble gas detector.\n\n LAST-MODIFIED:20230127T204302Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091012T190000Z DTEND:20091012T200000Z DTSTAMP:20260828T094430Z UID:5p2tetki0ini9oa74e5afkdjro@google.com CREATED:20091009T143051Z DESCRIPTION:Title : Leptogenesis\nSpeaker Name: Steve Blanchet\nSpeaker Ins titution : University of Maryland\nNotes: This is the Elementary Particle T heory Seminar.\nAbstract : The origin of matter in the universe is one of t he main puzzles of cosmology. An attractive explanation is provided by lept ogenesis\, in which the right-handed neutrinos required for the seesaw mech anism of neutrino masses generate the necessary matter-antimatter asymmetry in their decay. I will discuss first the main features of the vanilla scen ario\, and then I will turn to flavor effects\, and to the consequences of having quasi-degenerate right-handed neutrinos. Finally\, I will discuss so me recent work aiming at probing leptogenesis at the LHC.\n LAST-MODIFIED:20230127T203927Z LOCATION:4102 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100128T193000Z DTEND:20100128T203000Z DTSTAMP:20260828T094430Z UID:gjhchqvg2cqg8httnf3mku2570@google.com CLASS:PUBLIC CREATED:20100120T184342Z DESCRIPTION:SPEAKER: Nico Yunes\n\nAFFILIATION: Princeton University\n\nT ITLE: General Relativity on Trial: Gravitational Waves and the Parameteriz ed Post-Einstenian Framework\n\nABSTRACT: With the imminent detection of g ravitational waves by ground-based interferometers\, such as LIGO\, VIRGO a nd TAMA\, pulsar timing observations\, and proposed space-borne detectors\, such as LISA\, we must ask ourselves: how much do we trust general relativ ity? The confirmation of general relativity through Solar System experiment s and binary pulsar observations has proved its validity in the weak-field\ , where velocities are small and gravity is weak\, but no such tests exist in the strong\, dynamical regime\, precisely the regime of most interest to gravitational wave observations. Unfortunately\, because of their inherent feebleness\, the extraction of gravitational waves from detector noise rel ies heavily on the technique of matched filtering\, where one constructs wa veform filters or templates to clean \nthe data. Currently\, all such wave forms are constructed with the implicit assumption that general relativity is correct both in the weak and strong\, dynamical regimes. Such an assumpt ion constitutes a fundamental bias that will introduce a systematic error i n the detection and \nparameter estimation of signals\, and in turn can lea d to a mischaracterization of the universe through incorrect inferences abo ut source event \nrates and populations. In this talk\, I will define this bias\, explain its possible consequences and propose a remedy through a new scheme: the parameterized post-Einsteinian framework. In this framework on e enhances waveforms via the inclusion of post-Einsteinian parameters \ntha t both interpolate between general relativity and well-motivated alternativ e theories\, but also extrapolate to unknown theories\, following sound the oretical principles\, such as consistency with conservation laws and symmet ries. The parametrized post-Einsteinian framework should allow matched filt ered data to select a specific set of post-Einsteinian parameters without { \\emph{a priori}} assuming the validity of the former\, thus allowing the d ata to either verify general relativity or point to possible dynamical stro ng-field deviations. LAST-MODIFIED:20230127T204037Z LOCATION:Physics Rm. 4208 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Group Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101013T200000Z DTEND:20101013T210000Z DTSTAMP:20260828T094430Z UID:tfjpkqtk9o997p29euruve662o@google.com CREATED:20100930T194938Z DESCRIPTION:Title: QUANT STRATEGIES & WHY QUANTS ARE\nNEEDED ON WALL STREET \nSpeaker: Arnold Miyamoto\, Managing Director\,\nCi􀆟group\n\nAbstract Arn old Miyamoto will present an overview of Foreign Exchange\nSales & Trading from its historical beginnings to\ntoday's environment. As Quan􀆟ta􀆟ve str ategies are at the\ncenter of how Wall Street works\, he will also discuss\ nwhere quants are used and the opportuni􀆟es. Lastly\, he\nwill reflect on the past 2 years in the financial markets\nwith a view toward what is on th e near horizon. LAST-MODIFIED:20230127T204821Z LOCATION:0112 Marker Room (Chemistry Building) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Physics Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091006T160000 DTEND;TZID=America/New_York:20091006T170000 DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com RECURRENCE-ID;TZID=America/New_York:20091006T160000 CREATED:20090819T165808Z DESCRIPTION:Speaker: Prof. Min Ouyang\, University of Maryland\n\nTitle: " Engineering\nFundamental Coupling Interactions at the Nanoscale"\n\nAbstrac t: One of the significant impacts of Nanoscience & Nanotechnology is to\nof fer opportunity for manipulating and fabricating artificial\nnanostructures (that might not even exist in our mother nature) with\ndesired property an d functionality. In this talk\, I will present a few\nrecent progresses fro m my research group to highlight this. I will\nstart from materials view po int and show how to achieve meticulous\ncontrol of nanostructures including morphology\, defect\, crystallinity\nand compositions based on bottom-up c hemical synthetic strategy.\nEnabled by such\, fundamental physics properti es such as photonic\,\nelectronic\, mechanic and spintronic interactions ca n be finely\ntailored at the nanoscale. Uniquely combined with our achievem ent of\nnanomaterials control different ultrafast laser spectroscopic\ntech niques have been applied to probe fine coupling interactions\nwithin as-syn thesized nanostructures. If time allowed\, I will further\nfocus on two exa mples: (1) electron-phonon and phonon-phonon\ninteractions within nanostruc tures. Role of defects on modifying such\nfundamental interactions will be discussed\, and I will also show how\nthese coupling interactions can be pr ecisely tuned by controlling\ndielectric confinement of nanostructures\; (2 ) light-matter-spin\ninteraction at the nanoscale. I will show how quantum confinement can\ntailor spin properties of nanostructures. And more signifi cantly\nlight-matter interaction can be engineered by artificial\nnanostruc tures and thus can be applied to manipulate spin through such\nas optical S tark effect at the nanoscale. LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111101T180000Z DTEND:20111101T193000Z DTSTAMP:20260828T094430Z UID:ia37rkutm8imcfdkbhmrv0kjhs@google.com CREATED:20110808T153802Z DESCRIPTION:Title: Collider Physics\nSpeaker: Maxim Perelstein \nInstitutio n: Cornell University\nAbstract: TBA LAST-MODIFIED:20230127T205257Z LOCATION:1204 Physics Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Collider Physics Lecture 2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110310T210000Z DTEND:20110310T220000Z DTSTAMP:20260828T094430Z UID:hu1qnhhf45e8aka4t8hva38pt4@google.com CREATED:20110221T153634Z DESCRIPTION:[Title] "Effective Approaches to Dark Matter"\n[Speaker] Yang B ai\, a candidate of Particle Theory faculty position\n[Institution] SLAC\, Stanford University\n[Abstract] Although the fact that a large fraction of the matter in the universe is non-baryonic is beyond doubt\, the exact comp osition of the dark matter is still shrouded in mystery. Using ultra-sensit ive detectors in the deep underground laboratories\, physicists are attempt ing to directly detect dark matter particles streaming from space. At colli ders\, physicists hope to manufacture large numbers of dark matter particle s and study their properties. Motivated by the G-parity in QCD\, I will fir st introduce a new dark matter candidate\, a weakly interacting stable pion \, which exists in the effective Lagrangian of new confining ``hidden QCD" with vector-like coupling of electroweak SU(2) to ``hidden sector'' fermio ns. I will show that in this model the dark matter-nucleus scattering is me diated by a bound state and as a result can explain the DAMA/LIBRA results whilst not being in conflict with other direct detection experiments. I wil l then use an effective field theory approach to show the important implica tions of colliders on dark matter direct detection. The synergy between dif ferent approaches to dark matter can help us eventually understand the matt er content of our universe. LAST-MODIFIED:20230127T204447Z LOCATION:4102 Physics Building SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111202T180000Z DTEND:20111202T190000Z DTSTAMP:20260828T094430Z UID:gued427374pp29t3rlh5307e9o@google.com CREATED:20111004T132537Z DESCRIPTION:Title : Dynamics of Excited States and Charges in Polymers and Nanocrystals for Optoelectronics\nSpeaker Name: Laurens Seibbeles\nAbstract : The seminar will report studies of the behavior of electronic excited st ates (excitons) and excess charge carriers in conjugated polymers and semic onductor quantum dots and nanorods. These materials have fascinating optica l and electronic properties that are of interest for applications in e.g. s olar cells\, photodiodes\, light-emitting diodes\, field-effect transistors and nanoscale molecular electronics.\n\nThin blend films of the polymer po ly(3-hexyl thiophene) (P3HT) and the electron acceptor PCBM (a C60 derivati ve) attract a great deal of attention as the light-absorbing and charge tra nsporting material in plastic solar cells. We studied the mechanism of char ge carrier photogeneration in these films by ultrafast optical pump-probe a nd terahertz spectroscopy. Photoexcitation leads to formation of free elect rons and holes\, rather than coulombically bound electron-hole pairs in clo se proximity.1\,2\n\nThe absorption of the infrared part of the solar spect rum can be enhanced by adding PbS quantum dots to a P3HT:PCBM film. We stud ied charge transfer from photoexcited quantum dots to P3HT and PCBM. While charges undergo transfer from the quantum dots to the organic components\, they do not contribute to the terahertz photoconductivity. The absence of f ormation of free mobile charges can be explained by coulomb interaction wit h charge-induced dipoles in the highly polarizable quantum dots.\n\nThe gen eration of two or more excited states for the absorption of a single energe tic photon is of interest for development of highly efficient (up to 44%) s olar cells. For PbSe quantum dots in solution this process of carrier multi plication leads to multiple excitons within a quantum dot.3\,4 By contrast\ , in films carrier multiplication leads to generation of free mobile charge s that can move freely from one quantum dot to another.5\,6 The charges are readily available for use in optoelectronic devices even without employing any complex donor/acceptor architecture or electric fields.\n\nWe found fr om terahertz photoconductivity measurements that photoexcitation of CdS nan orods does produce charges that are freely mobile within a rod. At higher d ensity the conductivity becomes independent on the number of charges in a r od. This unexpected behavior is attributed to effects of quantum confinemen t.\n\n1) J. Piris\, T.E. Dykstra\, A.A. Bakulin\, P.H.M. van Loosdrecht\, W . Knulst\, M.T. Trinh\, J.M. Schins and L.D.A. Siebbeles\, J. Phys. Chem. C \, 113\, 14500-14506 (2009)\n\n2) W.J. Grzegorczyk\, T.J. Savenije\, T.E. D ykstra\, J. Piris\, J.M. Schins and L.D.A. Siebbeles\, J. Phys. Chem. C\, 1 14\, 5182-5186 (2010)\n\n3) M.T. Trinh\, A.J. Houtepen\, J.M. Schins\, T. H anrath\, J. Piris\, W. Knulst\, A.P.L.M. Goossens and L.D.A. Siebbeles\, Na no Lett.\, 8\, 1713-1718 (2008)\n\n4) M.T. Trinh\, L. Polak\, J.M. Schins\, A.J. Houtepen\, R. Vaxenburg\, G.I. Maikov\, G. Grinbom\, A.G. Midgett\, J .M. Luther\, M.C. Beard\, A.J. Nozik\, M. Bonn\, E. Lifshitz and L.D.A. Sie bbeles\, Nano Lett.\, 11\, 1623-1629 (2011)\n\n5) E. Talgorn\, Y. Gao\, M. Aerts\, L.T. Kunneman\, J.M. Schins\, T.J. Savenije\, M.A. van Huis\,H.S.J. van der Zant\, A.J. Houtepen and L.D.A. Siebbeles\, Nature Nanotech.\, DOI :10.1038/nnano.2011.159 (2011)\n\n6) M. Aerts\, C.S. Suchand Sandeep\, Y. G ao\, T.J. Savenije\, J.M. Schins\, A.J. Houtepen\, S. Kinge and L.D.A. Sieb beles\, Nano Lett.\, DOI: 10.1021/nl202915p (2011) LAST-MODIFIED:20230127T204810Z LOCATION:Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091112T170000Z DTEND:20091112T180000Z DTSTAMP:20260828T094430Z UID:ooupgoqqgoj6n1nd4uerafusrg@google.com CREATED:20091104T144707Z DESCRIPTION:Title : Applied Dynamics Seminar - Line-Defect Patterns of Unst able Spiral Waves in Cardiac Tissue\nSpeaker Name: Juan Restrepo\nSpeaker I nstitution : Department of Applied Mathematics\, University of Colorado\nAb stract : Spiral waves of voltage signaling in cardiac tissue are widely rec ognized to play an important role in the genesis of lethal heart rhythm dis orders. Previous modeling studies have shown that the breakup of such waves \, which has been proposed as a mechanism for heart fibrillation\, can be m ediated by a generic period doubling bifurcation. This bifurcation leads to beat-to-beat changes of action potential duration known as alternans. I wi ll present a study of the spatial patterns of alternans before spiral break up. It is found numerically that the line defects\, the location of the poi nts where the dynamics has period one\, can form either as a one- or a thre e-arm spiral pattern where each arm corresponds to a line defect emanating from the spiral core. These findings are interpreted analytically using a s imple theory where spiral wave unstable modes with different numbers of lin e defects correspond to quantized solutions of a Helmholtz equation. Furthe rmore\, the slow !\n\ninward rotation of spiral line defects is described i n different regimes. LAST-MODIFIED:20230127T204126Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Research in Electronics & Applied Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20081124 DTEND;VALUE=DATE:20081125 DTSTAMP:20260828T094430Z UID:qhdcjoe6c8a9o93ema5dhgupmk@google.com CREATED:20081110T163312Z DESCRIPTION:Title: Technology Pull\nSpeakers: Various\nMore Information: WW W.MEMS-ALLIANCE.ORG LAST-MODIFIED:20230127T204148Z LOCATION:Applied Physics Laboratory\, Johns Hopkins University SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mid Atlantic MEMS Alliance 9th Annual Special Topics Symposium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090511T180000Z DTEND:20090511T190000Z DTSTAMP:20260828T094430Z UID:hjdah987csp8hp01ptp8etdpfc@google.com CREATED:20090504T202958Z DESCRIPTION:Title: Dark Matter through the Axion Portal\nSpeaker: Dr. Jesse Thaler\, University of California\, Berkeley LAST-MODIFIED:20230127T204947Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20120405T180000Z DTEND:20120405T193000Z DTSTAMP:20260828T094430Z UID:2t51keu255rqqifuu7kkf5febg@google.com CREATED:20120118T182720Z DESCRIPTION:Speaker: Audrey Chubukov\, Univ. of Wisconsin @ Madison\nTitle: Superconductivity from Repulsive Interactions\nAbstract: The theory of su perconductivity\, for which Nobel Prize was given in 1972\, named electron- phonon interaction as a glue that overcomes Coulomb repulsion and binds fer mions into pairs which then condense and super-conduct. I review recent an d not so recent works aiming to understand whether a nominally repulsive C oulomb interaction can by itself give rise to a superconductivity. I firs t discuss a generic scenario of the pairing by electron-electron interacti on\, put forward by Kohn and Luttinger back in 1965 in their attempt to exp lain superfluidity in 3He\, and then move to discuss modern studies of th e electronic mechanisms of superconductivity in the cuprates\, Fe-pnictide s\, and even in graphene. LAST-MODIFIED:20230127T204904Z LOCATION:Rm 1201\, Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121005T180000Z DTEND:20121005T203000Z DTSTAMP:20260828T094430Z UID:sga2rfl62kv71j8dsiiou7n4i8@google.com CREATED:20121001T141502Z DESCRIPTION:"JSI Scientists Jamboree"\nThere will be 6 talks\, each 20 minu tes long including questions\, and (hopefully) suitable for a general JSI a udience that is not expert in the speaker's field.\n\nSchedule of Talks:\n\ n2:00 pm -- 3:00 pm\nTitle: "X-ray Counterparts to Advanced LIGO Transients " \nSpeaker: Jonah Kanner\n\nTitle: "Simulating the First Galaxies" \nSpeak er: Owen Parry \n\nTitle: "Aspects of the Dynamics of Compact Binaries and the Gravitational Radiation They Emit" \nSpeaker: Tanja Hinderer \n\n3:00 pm -- 3:30 pm -- Break\n\n 3:30 pm -- 4:30 pm \nTitle: "BAMBI: Blind Accele rated Multimodal Bayesian Inference"\nSpeaker: Philip Graff \n\nTitle: "T he Dynamics and Growth of Supermassive Black Holes in Merging Galaxies"\nSp eaker: Laura Blecha\n\nTitle: "Feeding and small-scale feedback in Low-Lumi nosity AGNs"\nSpeaker: Roman Shcherbakov\n\nSome logistcal details follow:\ n\nThe Symposium will be held in Room 2400 of the Computer & Space Sciences Building. This is the new wing of the building and not easily accessible f rom the Astronomy Department so attendees are best advised to enter through the main entrance of the new wing as indicated on the Google map. Please c ontact Susan Lehr for additional parking information.\n(Lunch available beg inning at 1 pm in the concourse area outside of Room 2400) LAST-MODIFIED:20230127T204639Z LOCATION:Room 2400 Computer and Space Sciences Building\, University of Mar yland\, College Park SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20121108T183000Z DTEND:20121108T190000Z DTSTAMP:20260828T094430Z UID:hh509b96trq870u16kdnf28h3s@google.com CREATED:20121031T203140Z LAST-MODIFIED:20230127T204456Z LOCATION:Room 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130211T164500Z DTEND:20130211T173000Z DTSTAMP:20260828T094430Z UID:md6amhk9arva6u2pieduj18sfo@google.com CREATED:20130206T150758Z LAST-MODIFIED:20230127T205107Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130520T154500Z DTEND:20130520T163000Z DTSTAMP:20260828T094430Z UID:fu7tv59r7kek2bu54ktjal353s@google.com CREATED:20130508T134452Z LAST-MODIFIED:20230127T204018Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon for seminar attendees TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131114T190000Z DTEND:20131114T203000Z DTSTAMP:20260828T094430Z UID:2n93ctsvt2c21c26gk0edjkh14@google.com CREATED:20131024T155547Z DESCRIPTION:Speaker: Johnpierre Paglione\, University of Maryland Physics\n \nTitle: Toward true topological insulator materials\n\nAbstract: Bismuth selenide\, regarded as the archetype topological insulator material\, is i n reality a good conducting metal with bulk carriers that derive from a sel f-doping caused by selenium vacancies. We report the synthesis of stoichiom etric Bi2Se3 crystals that exhibit nonmetallic behavior in electrical trans port down to low temperatures\, providing the first indications of a truly insulating topological insulator material. I will discuss the peculiar pres ence of both electron- and hole-like carriers\, along with the achievement of ambipolar transport in bulk Bi2Se3 crystals without gating techniques. I n addition\, new quantum transport studies of the proposed topological Kond o insulator samarium hexaboride will present our findings of a unique signa ture of non-trivial surface states.\n\n LAST-MODIFIED:20230127T204032Z LOCATION:physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101110T201500Z DTEND:20101110T211500Z DTSTAMP:20260828T094430Z UID:bc1cuive15ohe3u4lud2elpug4@google.com CREATED:20101019T193422Z DESCRIPTION:[Title] “Tabletop Tests of Gravitation”\n[Speaker] Stephan Schl amminger \n[Institution] University of Washington LAST-MODIFIED:20230127T204325Z LOCATION:4102 Physics Building SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Gravity Theory Sminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130904T133000 DTEND;TZID=America/New_York:20130904T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20130904T133000 CREATED:20130816T163032Z DESCRIPTION:Title: Can Black Hole-Neutron Star Binary Mergers Produce Gamma -Ray Bursts?\n\nSpeaker: Zachariah Etienne\, UMD/GSFC\n\nAbstract: Gravitat ional waves sap orbital angular momentum and energy from a black \nhole--ne utron star (BH-NS) binary\, driving it to inspiral and merge. In \nthe viol ence of merger\, the NS may tidally disrupt and form a hot \naccretion disk with the collimated magnetic fields necessary to launch \njets\, providing the central engine for one of the most energetic phenomena \nin the Univer se: a gamma-ray burst (GRB). We assess the feasibility of \nthis scenario w ith numerical relativity simulations of magnetized BH-NS \nbinary mergers\, seeding the NS with magnetic fields and exploring their \neffects on the r emnant disk and the gravitational waves. We find that the \ngravitational w aves are likely to be detectable by Advanced LIGO if the \nmerger occurs wi thin ~100Mpc\, though the effects of magnetic fields on the \nwaveforms are likely negligible. Further\, we find that a GRB central \nengine may form if large-scale poloidal magnetic fields anchored in the \ndisk are accreted onto the BH after the NS disrupts. LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120108T003000Z DTEND:20120108T013000Z DTSTAMP:20260828T094430Z UID:do9os5oo8ii8adjvecf8nmj0t4@google.com CREATED:20110818T203628Z DESCRIPTION:All about atomic structure\, atomic spectra and a multitude of laser phenomena! Everyone who attends will get a piece of diffraction grati ng (to keep!) that can be used to analyze any source of light. \n\nDoors op en 7:00PM\nFor directions and further information call 301-405-6045 or visi t www.physics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T204513Z LOCATION:The Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - The Atom TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081027T200000Z DTEND:20081027T210000Z DTSTAMP:20260828T094430Z UID:jsok77nk7tgs638abp7nnoh09s@google.com CREATED:20081022T150933Z DESCRIPTION:Speaker: Susan Rempe\, Ph.D.\, Biomolecular Interfaces & System s\, Sandia National Laboratories\, Albuquerque\, NM\nTitle: "Ion Discrimina tion by Nanoscale Design"\n LAST-MODIFIED:20230127T204644Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080929T163000Z DTEND:20080929T173000Z DTSTAMP:20260828T094430Z UID:3c93vckaafhheq7qu08lr3rjpo@google.com CREATED:20080912T164838Z DESCRIPTION:Speaker:Steven Cundiff\, JILA\, University of Colorado and NIST \nTitle:"Optical Multidimensional Fourier Transform Spectroscopy of Semicon ductors"\n LAST-MODIFIED:20230127T204849Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080807T223000Z DTEND:20080807T233000Z DTSTAMP:20260828T094430Z UID:715s6nqd4986fmuji8ba6ambdg@google.com CREATED:20080805T203810Z LAST-MODIFIED:20230127T204353Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics rocks TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090825T123000Z DTEND:20090825T220000Z DTSTAMP:20260828T094430Z UID:t3f9gqtriocv3pf2aaha0cerdc@google.com CREATED:20090824T141007Z DESCRIPTION:Organizers: Cole Miller\, Chris Reynolds\, Manuel Tiglio\nFor m ore information\, visit: www.cscamm.umd.edu/programs/fsg09/\n LAST-MODIFIED:20230127T204050Z LOCATION:CSIC Building\, Seminar Room 4122 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Matter & Electromagnetic Fields in Strong Gravity Workshop (8/24-8/ 28) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20101005T163000Z DTEND:20101005T180000Z DTSTAMP:20260828T094430Z UID:h1p97o085c5smae7sijb8qm2n4@google.com CREATED:20100914T154636Z DESCRIPTION:SPEAKER: Teppei Katori\nAFFILIATION: Massachusetts Inst of Tech nology\, Cambridge\nTITLE: MiniBooNE\, A Neutrino Oscillation Experiment a t Fermilab\nABSTRACT: MiniBooNE is designed to search for muon neutrino to electron \nneutrino (anti-muon neutrino to anti-electron neutrino) oscilla tions\, in \norder to check the observation by the LSND experiment at the L os Alamos \nNational Laboratory. In the first oscillation result from the neutrino \nmode\, MiniBooNE saw no excess at the energy region where LSND-l ike neutrino\nmass model expected signals. However an anomalous excess was seen in the \nlow energy region. After re-visiting all sources of backgro unds\, no \nStandard Model explanation has yet been found for these low ene rgy excess. \nRecently\, MiniBooNE published an updated anti-neutrino oscil lation result\, \nwhich is more direct test of LSND experiment since LSND w as the \nanti-electron neutrino appearance signals. As opposed to neutrino mode \nresult\, MiniBooNE confirmed an excess of LSND-like neutrino oscill ation \nevents in anti-neutrino mode. In this talk\, general physics of Mi niBooNE \nwill be presented along with descriptions of the neutrino beam\, detector\, \nand analysis\, with several latest results.\n LAST-MODIFIED:20230127T204121Z LOCATION:Physics Rm 1305F SEQUENCE:6 STATUS:CONFIRMED SUMMARY:Joint Nucl Phys & High Energy Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131024T163000Z DTEND:20131024T173000Z DTSTAMP:20260828T094430Z UID:hhqc9prhdgga5o6t3h9mvgae2g@google.com CREATED:20131007T155452Z DESCRIPTION:Title : Stabilization of incoherence in the disordered Hamilton ian Mean Field model\nSpeaker Name: Prof. Juan Restrepo\nSpeaker Institutio n : University of Colorado\, Bolder\nAbstract : We study the Hamiltonian Me an Field model of coupled Hamiltonian rotors with a heterogeneous distribut ion of moments of inertia and coupling strengths. We show that when the par ameters of the rotors are heterogeneous finite size fluctuations can greatl y modify the coupling strength at which the incoherent state loses stabilit y by inducing correlations between the momentum and parameters of the rotor s. For unimodal parameter distributions\, we find an analytical expression for the modified critical coupling strength in terms of statistical propert ies of the parameter distributions and confirm our results with numerical s imulations. We find numerically that these effects disappear for strongly b imodal parameter distributions.\n\n LAST-MODIFIED:20230127T205243Z LOCATION:IREAP Large Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar-**Cancelled** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091117T194500Z DTEND:20091117T204500Z DTSTAMP:20260828T094430Z UID:kkoh9kaqkqvjnmghg90144sack@google.com CREATED:20091111T202223Z DESCRIPTION:[Title] Boosting Higgs Discovery at the LHC\n[Speaker] Tuhin Ro y\n[Institution] University of Oregon\n LAST-MODIFIED:20230127T204730Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Sminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120507T154500Z DTEND:20120507T164500Z DTSTAMP:20260828T094430Z UID:vqfkgg93176rupfh77t5iffmp4@google.com CREATED:20120502T201434Z LAST-MODIFIED:20230127T204216Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100226T160000Z DTEND:20100226T170000Z DTSTAMP:20260828T094430Z UID:2hurgmcsg2lgnt7me08anrckl8@google.com CREATED:20100218T164300Z DESCRIPTION:Title : Strongly correlated Cooper pair insulators and superflu ids\nSpeaker Name: Predrag Nikolic\nSpeaker Institution : George Mason Univ ersity\nNotes: For more events see website at http://www.physics.umd.edu/cm tc/seminars.html\nAbstract : Strong pairing correlations are responsible fo r unconventional properties of various important systems\, ranging from cup rate high-temperature superconductors to ultra-cold atoms. This talk will e xplore a number of phenomena associated with strong pairing\, with a specia l emphasis on universal (system-independent) effects. Universality is contr olled by a renormalization group fixed point which gives rise to "unitarity "\, the most correlated regime of fermionic particles with attractive inter actions. One of the main questions is what unconventional normal states can be obtained when quantum fluctuations destroy the superfluid in this regim e\; is there something we can learn about the "pseudogap" of cuprates? We t ry to find answers in two contexts. First\, we examine the phase diagram of two-dimensional superfluids with violated time-reversal symmetry\, and dis cover a rich phase diagram of vortex lattice Fulde-Ferrell-Larkin-Ovchinnik ov phases formed in the background of quantum Hall states. We also point ou t the unavoidable existence of strongly correlated insulators which could b e characterized as vortex liquids. Second\, the pairing instability in a ti me-reversal symmetric band-insulator is unconventional and leads to a speci al kind of supersolid dubbed "pair density wave". Quantum fluctuations can reshape this instability and possibly produce Mott insulators even in the l imit of weak pairing.\n LAST-MODIFIED:20230127T204729Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091216T200000Z DTEND:20091216T210000Z DTSTAMP:20260828T094430Z UID:4aml2rqca4bav2iog5u7lat05k@google.com CREATED:20091210T135135Z DESCRIPTION:Title: Lilliputian techniques for characterizing the mechanical response of MEMS and nanocrystalline thin films\n \nBy: Kevin J. Hemker\nD epartments of Mechanical Engineering and Materials Science and Engineering\ nJohns Hopkins University\n \nAbstract:\nMicro-tensile testing and TEM have been employed to characterize the small-scale and scale-specific mechanica l behavior of materials for MEMS and nanocrystalline thin films. MEMS struc tures are often deposited far from microstructural equilibrium and the mech anical properties of these materials will be shown to be strongly processin g\, microstructure and temperature dependent. The extremely high hardness and strength of nanocrystalline materials have been well-documented\, but o perative deformation mechanisms in these materials have proven to be much h arder to quantify. Experimental observations of twinning and grain growth in nc-Al will be used to underscore the novel deformation mechanisms operat ive in nanocrystalline metals. Of particular interest is the extended plast icity that occurs as a result of stress-induced discontinuous grain growth. Efforts to model this growth with traditional driving forces have proven l ess than satisfactory\, and the importance of grain boundary pinning and th e role of stress assisted grain boundary migration appear to be more import ant. The significance of this finding with respect to the reliability of th in film nanocrystalline devices cannot be ignored\, as the mechanical behav ior of these structures appears to not only be different than that of micro crystalline metals but dynamic as well. LAST-MODIFIED:20230127T204338Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Gree nmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101025T200000Z DTEND:20101025T210000Z DTSTAMP:20260828T094430Z UID:csklr2bb8c74tuvaccsebuc6lo@google.com CREATED:20101019T174434Z DESCRIPTION:Speaker: Maumita Mandal\, Carnegie Mellon\n University\n \nTitle: "Single-molecule studies to unravel \n ligand-induced riboswitch\n structu re folding". LAST-MODIFIED:20230127T204902Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100129T160000Z DTEND:20100129T173000Z DTSTAMP:20260828T094430Z UID:h9rl48btst4os3c16etrheq6f8@google.com CREATED:20100112T205010Z DESCRIPTION:Title : Introduction to AdS/CFT and its applications\nSpeaker N ame: Edwin Barnes\nSpeaker Institution : University of Virginia\nNotes: For more events see website: http://www.physics.umd.edu/cmtc/seminars.html\nAb stract : The anti-de-Sitter space/conformal field theory (AdS/CFT) correspo ndence is a powerful tool in the study of conformal field theories\, which are ubiquitous in High Energy and in the study of phase transitions in Cond ensed Matter (CM) and cold atomic systems. AdS/CFT is a conjectured duality that maps a CFT without gravity to a string theory on a curved space. In r egimes where the CFT is most difficult to solve\, the string theory tends t o be simple\, effectively reducing to Einstein’s gravity theory. I will beg in with an extensive introduction to the basic features of AdS/CFT. I will describe some of my own research using it in the context of scattering ampl itudes and time-dependent thermal processes. I will also discuss some of th e exciting new applications to CM and cold atomic systems and conclude with possible future directions along these lines. LAST-MODIFIED:20230127T204106Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120223T190000Z DTEND:20120223T200000Z DTSTAMP:20260828T094430Z UID:a20t4efs71lqo6vcu9uj9863a0@google.com CREATED:20120216T205127Z DESCRIPTION:Speaker: Matt Doty\, Dept. of Materials Science & Engineering\ , University of Delaware\nQuantum Dot Molecules:\nTitle: Designing\, build ing and understanding nanostructured semiconductors for optoelectronic appl ications\n\nAbstract: Quantum Dots are nanometer-sized semiconductors in wh ich electrons are strongly confined by potential barriers. Because the conf inement leads to discrete energy states analogous to the energy levels of n atural atoms (s\, p\, d\, etc.)\, quantum dots are often described as artif icial atoms. Coupled pairs of quantum dots are similarly described as artif icial molecules due to the formation of delocalized molecular states. In th is talk I will discuss our work to understand the properties of quantum dot molecules using optical spectroscopy measurements of single molecules and ultrafast optical measurements of carrier dynamics. I will then discuss how we use our understanding of these novel nanostructures to design and engin eer new molecules with specific and tunable properties tailored for optoele ctronic applications. One application is in optoelectronic information proc essing based on single charges and/or spins. Another application is in the development of new nanostructured photovoltaic materials. \n\nHost: Min Ou yang LAST-MODIFIED:20230127T203934Z LOCATION:Room 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100203T210000Z DTEND:20100203T220000Z DTSTAMP:20260828T094430Z UID:mtv8nl3hbajlraum5c32geo044@google.com CREATED:20100203T162907Z DESCRIPTION:SPEAKER: Shmuel Nussinov\n\nAFFILIATION: Tel-Aviv University\ n\nTITLE: Glueballing: A New Look at Glueballs LAST-MODIFIED:20230127T205121Z LOCATION:Physics Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110414T163000Z DTEND:20110414T173000Z DTSTAMP:20260828T094430Z UID:jlk0o9ivbcmjmro9auuf80qpqs@google.com CREATED:20110407T170819Z DESCRIPTION:Title: Bifurcations and Pattern Formation in a System of Contin uum-Coupled Maps Modeling a Heart Rhythm Instability\nSpeaker: Prof. Juan R estrepo\, Department of Applied Mathematics\, University of Colorado at Bou lder\n LAST-MODIFIED:20230127T204316Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110218T160000Z DTEND:20110218T170000Z DTSTAMP:20260828T094430Z UID:rsjdvdkloviejr06616nt25ip0@google.com CREATED:20110214T162438Z DESCRIPTION:Title : Bound States in Surface Topological Defects\nSpeaker Na me: Roger Mong\nSpeaker Institution : Berkeley\nNotes: CMTC Seminars List:\ nhttp://www.physics.umd.edu/cmtc/seminars.html\nAbstract : Topological insu lators (TI) and superconductors support surface states\, and more generally gapless modes within domain walls and topological defects. We consider sys tems that have gapped dispersion along their surfaces and defects\, but sup port midgap states bound to where the surfaces / defects terminate. Surpris ingly\, these features may be found in materials with little engineering. W e will discuss how the defect bound states arise from the bulk band structu re\, focusing on chiral wires in "antiferromagnetic topological insulators" and Majorana bound states in TI-based superconductors as examples. The com pounds GdBiPt\, doped TlBiTe2 and pressurized Bi2Te3 are candidates exhibit ing these features. LAST-MODIFIED:20230127T205132Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110404T200000Z DTEND:20110404T210000Z DTSTAMP:20260828T094430Z UID:3vekn3vbjp02bcco7naj16vkec@google.com CREATED:20110328T140032Z DESCRIPTION:Title : Fluctuation and Dynamic Arrest in Cells.\nSpeaker Name: Professor David Weitz\nSpeaker Institution : Harvard University\nNotes: Re freshments at 3:45pm LAST-MODIFIED:20230127T204844Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST/Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110412T200000Z DTEND:20110412T210000Z DTSTAMP:20260828T094430Z UID:d1fifh6l6b107gi8movqrbjksg@google.com CREATED:20110404T140845Z DESCRIPTION:Title : Monte Carlo Methods for Rough Free Energy Landscapes\nS peaker Name: Professor Jon Machta\nSpeaker Institution : University of Mas sachusetts\n LAST-MODIFIED:20230127T205307Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120503T180000Z DTEND:20120503T193000Z DTSTAMP:20260828T094430Z UID:dtencbnvo9iaagfqhrfbvrp37g@google.com CREATED:20120419T151921Z DESCRIPTION:Speaker: Brian LeRoy\, Univ. of Arizona\nTitle: Imaging Local E lectronic Properties of Graphene\nAbstract: Scanning probe microscopy is a powerful tool to probe low-dimensional systems. The local information prov ided by scanning probe microscopy is invaluable for studying effects such a s interactions and scattering. Using this approach\, we have probed the loc al electronic properties of graphene. Graphene is a single atomic layer she et of carbon atoms in a honeycomb lattice. Because of the honeycomb lattice \, it has a unique linear dispersion relation and the charge carriers behav e as massless fermions near the Dirac point. We have studied the effect of charged impurities\, edges and the underlying substrate on the local densit y of states. We find that long‑range scattering from charged impurities loc ally shifts the charge neutrality point leading to electron and hole puddle s. Near edges\, we observe oscillations in the electron density that change wavelength as a function of energy and have an unusual decay length becaus e of the chiral nature of the quasiparticles. By using boron nitride as a s ubstrate\, we observe an improvement in the electronic properties of the gr aphene as well as a moire pattern due to the misalignment of the graphene a nd boron nitride lattices. We find that the periodic potential due to the b oron nitride substrate creates a set of 6 new Dirac points in graphene.\n\n Host: Michael Fuhrer\n LAST-MODIFIED:20230127T204557Z LOCATION:Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131111T213000Z DTEND:20131111T223000Z DTSTAMP:20260828T094430Z UID:brvnhr3d5d4h6bcog2e4tjokq8@google.com CREATED:20131023T145847Z DESCRIPTION:Title : TBA\n\nSpeaker Name: Matthew H. Burger\n\nSpeaker Insti tution : Goddard Space Flight Center\n\nNotes: Coffee\, Tea & Cookies 4:15- 4:30 PM\n LAST-MODIFIED:20230127T204725Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101021T163000Z DTEND:20101021T173000Z DTSTAMP:20260828T094430Z UID:64c75e75b5p94co43gedjnf5kk@google.com CREATED:20101015T140928Z DESCRIPTION:Title: Quantum Chaotic Scattering in Microwave Billiards\nSpeak er: Dr. Barbara Dietz-Pilatus\nTechnische Universität Darmstadt\nDept. of P hysics LAST-MODIFIED:20230127T204027Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111130T193000Z DTEND:20111130T210000Z DTSTAMP:20260828T094430Z UID:4it8jcicu8fe0bq56q5jhpcp3g@google.com CREATED:20110718T181323Z DESCRIPTION:SPEAKER: Bjoern Schenke\, Brookhaven Natl. Lab.\, NY\nTITLE: Analyzing the Quark-Gluon Plasma with Higher Flow Harmonics\nABSTRACT: I present recent developments in describing anisotropic flow at the Relativis tic Heavy-Ion Collider (RHIC at BNL and the Large Hadron Collider (LHC) at CERN with a relativistic 3+1 dimensional viscous event-by-event hydrodynami c simulation. I present results for elliptic and triangular flow as well as higher flow harmonics. Systematic comparisons to experimental data allow for the extraction of transport coefficients of the quark-gluon plasma and will yield detailed information on the initial state in heavy-ion collision s. \n LAST-MODIFIED:20230127T204451Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111006T163000Z DTEND:20111006T173000Z DTSTAMP:20260828T094430Z UID:qo6asjmeh7voti0ru57lb5vq84@google.com CREATED:20111003T150748Z DESCRIPTION:Title: Complex Network Structural Analysis of Vicsek's Bird Flo cks \nSpeaker: Dr. Julian Candia\, Dept. of Physics\, University of La Pla ta\, Argentina LAST-MODIFIED:20230127T205315Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110308T181500Z DTEND:20110308T193000Z DTSTAMP:20260828T094430Z UID:pq54uj74rdfgb75sfstvsvlcmk@google.com CREATED:20110302T151349Z DESCRIPTION:Title : Evidence for a Diverging Length Scale in Granular Packi ngs at the Onset of Unjamming\nSpeaker Name: Dr. Mitch Mailman\nSpeaker Ins titution : UMCP\nNotes: As in the past\, each seminar will be preceded by a n INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1 108 about five minutes after 12:00 (Noon).\nFor further information contact :\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\, (301)405-4439\nProf essor John Weeks\, jdw@umd.edu\, (301)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)405-1610\n LAST-MODIFIED:20230127T205108Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130308T160000Z DTEND:20130308T173000Z DTSTAMP:20260828T094430Z UID:s5sf104s48v8v9837rbvg02t7k@google.com CREATED:20130307T223916Z DESCRIPTION:Speaker: Bryan Hemingway\, University of Cincinnati\n\nTitle: AC Spectroscopy of Kondo Dynamics in a Single-Electron Transistor\n\nAbstr act: The exchange interaction in electronic systems governs an array of ben chmark condensed matter systems as well as opening a new chapter in modern quantum materials and quantum circuitry. This presentation focuses on a sp ecific exchange interaction between transport electrons and localized magne tic moments which produces a strongly-correlated electron system\, known as the Kondo effect. The rise of mesoscopic systems has provided a unique te st bed for studying the Kondo effect in the form of single-electron transis tors. The goal of this work is to investigate a fundamental question of th e Kondo regime : ``How does the correlation energy scale\, called the Kondo temperature\, influence dynamic transport?" First\, I will describe the r ole of the Kondo temperature (TK) in static measurements as well as conduct ance measurements demonstrating static universality of the Kondo regime. S econdly\, I will present conductance measurements describing the relationsh ip between TK and the time-dependent bias voltage parameters (amplitude and frequency). \n\nHost: Ian Appelbaum LAST-MODIFIED:20230127T204919Z LOCATION:Phys Rm 0360\, the CNAM Conference Rom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101101T180000Z DTEND:20101101T190000Z DTSTAMP:20260828T094430Z UID:ja3muomtda0r83i6bj2qc7el14@google.com CREATED:20101022T154533Z DESCRIPTION:Title: Cross-species Genomic Analyses of Cancer: how faithful are our mouse models?\n\nSpeaker: Jeffrey E. Green\, M.D.\nTransgenic Oncog enesis and Genomics Section\nLaboratory of Cancer Biology and Genetics \nNC I Bethesda\, MD\n\nThe ability to alter the mouse genome of the mouse germl ine has provided the opportunity to generate innumerable models of human di sease. In particular\, genetically-engineered mouse (GEM) models for many human cancers have been generated that have led to increased understanding of molecular mechanisms driving the initiation and progression of cancer. Initially\, the similarities between mouse cancer models and human cancer w ere evaluated on the basis of biology and histology. The development of hi gh-throughput genomic approaches\, however\, has provided the opportunity t o determine more precisely on a genomic and molecular level how well such m odels recapitulate human cancer. We have taken several approaches to compa re high throughput genomic data from human breast cancer with that of sever al relevant mouse models of mammary cancer. These comparisons have identif ied important similarities and differences between the mouse models and hum an breast cancer. Using gene expression profiling\, we have identified a g enetic network similarly expressed in both a mouse model of human basal tri ple-negative breast cancer and this highly aggressive sub-type of human bre ast cancer. The components of this network are being tested as potential a nti-cancer targets. Ongoing research comparing miRNA expression and array comparative genomic hybridization in the mouse cancer models with that of human breast cancer will also be presented. These approaches offer a ratio nal approach for validating particular animal models for use in preclinical testing of anti-cancer therapies.\n LAST-MODIFIED:20230127T203947Z LOCATION:Biosciences Research Building\, Room 1103 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:University of Maryland - National Cancer Institute - Cancer Technol ogy Partnership's Fall 2010 Colloquia Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131021T150000Z DTEND:20131021T163000Z DTSTAMP:20260828T094430Z UID:8nrpm31on1ngdduo24qvgjb4ro@google.com CLASS:PUBLIC CREATED:20130823T174156Z DESCRIPTION:Title: Superradiance\, molecules\, and quantum optics\n\nAbstra ct:\nSuperradiance is a consequence of a self-induced collective dipole and is a fast and strong increase in spontaneously radiated intensity. Associa ted with this increased decay rate a shift can be seen - the "collective La mb shift." A recently developed formalism in the framework of a nonlinear m aster equation allows to describe this phenomenon along with both\, stimula ted and spontaneous shifts. I will describe some of our recent findings and try to answer questions that often come up in connection with superradianc e\, such as "does Dicke superradiance create entanglement?" LAST-MODIFIED:20230127T204559Z LOCATION:CSS Room 2400 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar - Susanne Yelin TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20121009T180000Z DTEND:20121009T190000Z DTSTAMP:20260828T094430Z UID:j0hp9fso9rm1rlnnapim38vov0@google.com CREATED:20120822T211804Z DESCRIPTION:Title: "The Quantum State of the Universe"\nSpeaker: James Hart le\nInstitution: UC\, Santa Barbara\nAbstract: If the universe is a quantum mechanical system then it has a quantum state. \nA theory of that state is a necessary part of any final theory that makes predictions for the large scale features of the universe that we observe today. This talk will focus one particular theory of the quantum state --- Hawking's no-boundary wave f unction of the universe. We will concentrate summarizing the current situat ion of its predictions for such large scale features of the universe as cla ssical spacetime\, inflation\, the arrows of time\, the CMB spectrum\, the existence of isolated systems\, the number of time dimensions\, and the top ology of space. \n\n*Prof. Hartle will meet with graduate students at 11am in room 4102 on Oct. 9. LAST-MODIFIED:20230127T204402Z LOCATION:1201 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110304T180000Z DTEND:20110304T190000Z DTSTAMP:20260828T094430Z UID:oa423t7hs69v6ebodoa4lq2rt0@google.com CREATED:20110303T134132Z DESCRIPTION:\nTitle :Evolution of a Stick: Vertically Aligned Carbon Nanofi bers for Cellular Interfacing\nSpeaker Name: Anatoli Melechko\nSpeaker Inst itution : North Carolina State University\nAbstract : The ability to synthe size carbon nanofibres (CNFs) with a high degree of control over their geom etry\, location and structure via catalytic plasma-enhanced chemical vapor deposition has expanded the possibility of new applications. The nanoscale dimensions and high aspect ratio of vertically aligned carbon nanofibres (V ACNFs)\, along with favorable physical and chemical characteristics\, has p rovided a nanostructured material with properties that are well-suited for interfacing with live cells and tissues. Some of the aspects of synthesis\, integration and functionalization of VACNFs\, followed by examples of how VACNFs have been used to interface with live systems for a variety of advan ced nanoscale biological applications will be described.\n LAST-MODIFIED:20230127T205006Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121010T170000Z DTEND:20121010T213000Z DTSTAMP:20260828T094430Z UID:8t1rok8b1rkrlpiksbopmho510@google.com CREATED:20121004T122556Z DESCRIPTION:(talks 30 minutes followed by 15 minutes of discussion)\n\nSpea kers and Titles:\nLev Bishop\, “Composite pulses for robust universal contr ol of singlet-triplet qubits: Part I”\nSunny Wang\, “Composite pulses for r obust universal control of singlet-triplet qubits: Part II”\nSriram Ganesha n\, “FQHE interferometers in strong tunneling regime. The role of compactne ss of edge fields”\nVladimir Zyuzin\, “Fractional Quantum Hall Effect from Phenomenological Bosonization”\nChenjie Wang\, “Rectification in Y-junction s of Luttinger liquid wires”\nMichael Levin\, “Protected edge modes and top ological phases”\n\nhttp://www.physics.umd.edu/cmtc/seminars/CMTC%20Symposi um%20Fall%202012_flyer.pdf LAST-MODIFIED:20230127T204946Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101012T171500Z DTEND:20101012T183000Z DTSTAMP:20260828T094430Z UID:8370vla3r14un6mrbs805fmfmc@google.com CREATED:20100930T173932Z DESCRIPTION:Title : Adsorption Freezing and Dynamics of Fluids Confined in Nanoporous Materials.\nSpeaker Name: Professor Benoit Coasne\nSpeaker Insti tution : Centre National de la Recherche Scientifique (CNRS) and Universite de Montpellier II\, Montpellier\, France\nNotes: As in the past\, each sem inar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welco me\, departing from Room 1108 above five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T204053Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130314T163000Z DTEND:20130314T173000Z DTSTAMP:20260828T094430Z UID:dd44hgv3cbk061a95c18ekmok0@google.com CREATED:20130129T154435Z DESCRIPTION:Title: High-Energy Atmospheric Physics: Dark Lightning and Rela ted Phenomena\nSpeaker: Joseph Dwyer\nFlorida Institute of Technology\n LAST-MODIFIED:20230127T203952Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110503T171500Z DTEND:20110503T183000Z DTSTAMP:20260828T094430Z UID:r5ffd7fpjmgabbqdcf3l32d91g@google.com CREATED:20110425T182223Z DESCRIPTION:Title : Stochastic Model for Epitaxial System in 1 + 1 Dimensio ns.\nSpeaker Name: Professor Dio Margetis\nSpeaker Institution : UMCP\nNote s: For further information contact:\nProfessor Christopher Jarzynski\, cjar zyns@umd.edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)405 -4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)405-1610 LAST-MODIFIED:20230127T204657Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110412T200000Z DTEND:20110412T210000Z DTSTAMP:20260828T094430Z UID:2436oktn38hpqiknpf9iscm19g@google.com CREATED:20110303T150041Z DESCRIPTION:Speaker: Rolf-Dieter Heuer\, CERN\nTitle: The Large Hadron Coll ider: Entering a New Era of Fundamental Science LAST-MODIFIED:20230127T203938Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130417T173000Z DTEND:20130417T183000Z DTSTAMP:20260828T094430Z UID:8ivtmbfo4fro2ab4nnbvc9sgbc@google.com CREATED:20130206T183127Z DESCRIPTION:Title: "Pulsar tests of modified Gravity"\nSpeaker: Claudia de Rham\nInstitution: Case Western Reserve University\nAbstract: Modifications of Gravity usually come hand in hand with new polarizations that can be pr obed on astrophysical and cosmological scaIes. In specific models such as Massive Gravity\, the force mediated by these extra polarizations are scree ned via the Vainshtein mechanism. After reviewing the theoretical framework behind this mechanism\, I will show how it affects the gravitational radia tion emitted by binary pulsar systems. In the simplest model\, the mechanis m successfully screens the effect from scalar fields conformally coupled to matter\, although gravitational radiation is less suppressed relative to i ts general relativity predictions than static fifth forces effects within p ulsar systems. I will then discuss extension of the mechanism to more gener al Galileon theories. LAST-MODIFIED:20230127T204744Z LOCATION:4102 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20111115T210000Z DTEND:20111115T220000Z DTSTAMP:20260828T094430Z UID:mgnr2t2qn2f5jje8r5h60qcjss@google.com CREATED:20110803T135407Z DESCRIPTION:Speaker: Dr. Andreas Acrivos\, Albert Einstein Professor Emerit us of Science and Engineering at the City College of New York LAST-MODIFIED:20230127T204807Z LOCATION:PHYS 1412 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:17th Annual Shih-I Pai Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101005T180000Z DTEND:20101005T190000Z DTSTAMP:20260828T094430Z UID:5mjonc2bne3540203amfois53s@google.com CREATED:20100928T201358Z DESCRIPTION:[Title] A New Method for Resolving Combinatorial Ambiguities at Hadron Colliders\n[Speaker] Felix Yu\n[Institution] University of Californ ia\, Irvine \n[Abstract] present a new method for resolving combinatorial a mbiguities that arise in multi-particle decay chains at hadron colliders wh ere the assignment of visible particles to the different decay chains has a mbiguities. This method\, based on selection cuts favoring high\ntransverse momentum and low invariant mass pairings\, is shown to be significantly su perior to the more traditional hemisphere method for a large class of decay chains\, producing an increase in signal retention of up to a factor of 2. This new method can thus greatly reduce the combinatorial ambiguities of d ecay chain assignments. LAST-MODIFIED:20230127T204702Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110329T171500Z DTEND:20110329T183000Z DTSTAMP:20260828T094430Z UID:72tpp9crhh50lq7m0tpprjvt2c@google.com CREATED:20110317T140836Z DESCRIPTION:Title : Is the Casimir Force Always Attractive?\nSpeaker Name: Professor Michael Levin\nSpeaker Institution : UMCP\n LAST-MODIFIED:20230127T205022Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121012T140000Z DTEND:20121012T150000Z DTSTAMP:20260828T094430Z UID:96r08oqvid5brt8emhda46igvo@google.com CREATED:20121005T172208Z DESCRIPTION:Title: Engineering New Strategies for the Treatment of Alzheime r's Disease\nSpeaker: Theresa Good\nProfessor\nDepartment of Chemical\, Bio chemical & Environmental Engineering\nUniversity of Maryland\, Baltimore Co unty LAST-MODIFIED:20230127T204759Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Distinguished Alumni Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130208T013000Z DTEND:20130208T030000Z DTSTAMP:20260828T094430Z UID:a641ut8qu149dsva28cql7ukgo@google.com CREATED:20130130T194455Z DESCRIPTION:Distinguished University of Maryland Professor Roald Z. Sagdeev will discuss “The Day I Said ‘Nyet!’ to Gorbachev… and Other Life Tales of a Famous Soviet Scientist” with journalist Daniel Zwerdling on Thursday\, February 7 from 8:30 to 10 pm at the Inn and Conference Center on the UMD c ampus. Sagdeev ran the Soviet space program and advised Soviet leaders on t he nuclear arms race. He’ll talk about love\, communism\, physics and the e nd of the Soviet Union with Daniel Zwerdling\, an award-winning corresponde nt and investigative journalist with National Public Radio. \n\nThe intervi ew\, which is free and open to the public\, will be held in Room 2103 at th e Inn and Conference Center\, 3501 University Blvd. East. It is part of th e "Sagdeev at 80" symposium sponsored by the University of Maryland Depart ment of Physics and the Eisenhower Institute. For further information\, ple ase contact Nick Hammer (nshammer@umd.edu or 301 405 5946). LAST-MODIFIED:20230127T205137Z LOCATION:Room 2103 at the Inn and Conference Center\, 3501 University Blvd. East SEQUENCE:0 STATUS:CONFIRMED SUMMARY:~SPECIAL EVENT~ Roald Sagdeev & NPR's Daniel Zwerdling TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100302T160000Z DTEND:20100302T171500Z DTSTAMP:20260828T094430Z UID:o04a2jsiead8ssioq6i5g3fnj8@google.com CREATED:20100225T192942Z DESCRIPTION:Nanoparticle Dispersion in Polymer Melts\n\nDavid Green\nDepart ment of Chemical Engineering\nUniversity of Virginia\n\nPolymer nanocomposi tes (PNCs)\, a developing class of materials\, consist of nanoscale objects such as rods\, particles and clays dispersed in concentrated polymer solut ions and melts. When nanofillers are integrated into these bulk phases\, re sulting material properties such as tensile strength\, hardness\, heat resi stance\, and electrical conductivity may be dramatically different than pre viously accessible with traditional fillers and may be finely controlled. P NCs hold promise in applications in biotechnology\, catalysis\, and plastic s. However\, a major challenge in developing these systems is overcoming th e driving forces that promote aggregation\, yielding suboptimal material pr operties. Specifically\, these driving forces are long-range attractive Van der Waals forces between particles and the thermodynamic favorability for the polymer chains of the melt to maximize available conformations by drivi ng particles together. A common technique to promote full dispersion of nan oparticles is steric stabilization\, achieved by chemically modifying the s urface of the particles by covalently bonding polymer brushes. For this gra ft layer to be effective in stabilizing particles\, its conformation must b e stretched such that interpenetration by the chains of the matrix polymer may occur. This state is commonly referred to as “complete wetting” and is accessed when the graft chain length is longer than that of the melt at suf ficiently high graft densities. However\, to date\, the impact of wetting o n the nanoparticle dispersion has not been well quantified. Thus\, a major focus of our research is to elucidate how wetting controls the optimal disp ersion of nanoparticles. We accomplish this through light scattering and rh eological measurements on polydimethylsiloxane (PDMS)-grafted silica nanosp heres in concentrated PDMS solutions and melts. By controlling the brush gr aft density and the matrix chain length of these model systems\, our result s indicate that their wetting and flow properties can be quantifiably linke d and finely controlled. Ultimately\, our results lead to a better understa nding of the role of the graft layer on nanoparticles dispersed in polymer solutions and melts and will aid in optimization of material properties of polymer nanocomposites in applications in biotechnology\, optics\, catalysi s\, and plastics.\n\nThis Event is For: Graduate • Faculty • Post-Docs LAST-MODIFIED:20230127T204733Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ChBE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091113T120000 DTEND;TZID=America/New_York:20091113T130000 DTSTAMP:20260828T094430Z UID:gqk8aq4f7igujg2gn5kmt4fudo@google.com RECURRENCE-ID;TZID=America/New_York:20091113T120000 CREATED:00010101T000000Z DESCRIPTION:Title : IREAP Graduate Student Seminar\nSpeaker Name: Tak Chu L i\nSpeaker Institution : UMD - IREAP\nNotes: Pizza for graduate students\; others pay $5.00. Submit your requests for pizza toppings and refreshment s to Peter Pan at zpan@umd.edu.\n LAST-MODIFIED:20230127T205253Z LOCATION:1207 Energy Research Facility SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Institute for Research in Electronics & Applied Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101208T201500Z DTEND:20101208T211500Z DTSTAMP:20260828T094430Z UID:qjjr6ovc0ul0gf5pvrhmsrj5s8@google.com CREATED:20101118T173403Z DESCRIPTION:[Title] "Spin-spin effects in binary black-hole dynamics and i nitial conditions in numerical-relativity simulations"\n[Speaker] Andrea Ta racchini\n[Institution] University of Maryland\n[Abstract] Building initial conditions for generic binary black-hole evolutions which are not affected by initial spurious eccentricity is still a challenge for numerical-relati vity simulations. This problem can be overcome by applying an eccentricity- removal procedure which consists in evolving the binary black hole for a co uple of orbits\,estimating the eccentricity and then restarting the simulat ion with adjusted initial conditions. The presence of spins can complicate this procedure. Using post-Newtonian theory\, we show\n that spin-spin inte ractions and precession prevent the binary from moving along an adiabatic s equence of spherical orbits\, inducing oscillations in the radial separatio n and in the orbital frequency. However\, spin-induced oscillations occur a t about twice the orbital frequency\, therefore they can be distinguished a nd disentangled from the initial spurious eccentricity\,which instead occur s at approximately the orbital frequency. After comparing numerical-relativ ity results to post-Newtonian predictions\, we develop a new eccentricity-r emoval procedure and find that it is rather successful in reducing the ecce ntricity to values less than 0.01%.\n\n LAST-MODIFIED:20230127T204838Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100428T193000Z DTEND:20100428T203000Z DTSTAMP:20260828T094430Z UID:2muce6kuhaco8q2saa3r6qfag4@google.com CREATED:20100423T182501Z DESCRIPTION:Title: Optical Interconnects for Petaflops Scale Supercomputers \n \nBy: Dr. H. Mandelberg\n Laboratory for Physical Sciences\n \nAbstra ct: There are various new technologies required to construct a petaflops su percomputer based on Josephson junction processors and memory. The requirem ents for an optical interconnect system capable of providing the necessary multi-petabit/sec bandwidth\, operating in a cryogenic to-room-temperature environment\, will be discussed\, along with some of the options being cons idered\, and the progress being made to meet this goal.\n LAST-MODIFIED:20230127T204911Z LOCATION:eminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College P ark\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120920T180000Z DTEND:20120920T193000Z DTSTAMP:20260828T094430Z UID:51sa5hehben22k9cp3e05qk45k@google.com CREATED:20120911T210640Z DESCRIPTION:Condensed Matter Colloquium\n\nSpeaker: N. Peter Armitage\, Joh ns Hopkins University\n\nTitle: Low frequency electrodynamics of topologic al insulator surface states\n\nAbstract: Prof. Armitage will report on his studies of high quality MBE grown Bi2Se3 and strained HgTe topological ins ulator thin films using time domain terahertz spectroscopy (TDTS). In the B i2Se3 case\, they explicitly demonstrate the 2D character of the response b y studying films of different thicknesses. In their measurements they take advantage of a unique feature of TDTS that allows them to use the time str ucture of the THz pulses to measure the Faraday and Kerr rotation angles in a single experiment. They find an unprecedentedly large value of the Kerr rotation that is due to the cyclotron resonance of the 2D Dirac fermions. He will also talk about their extension of these measurements to the strain ed HgTe topological insulator system.\n\nTheir most recent work is on dopin g Bi2Se3 with the indium toward the topologically trivial end member In2Se3 . Here\, the thickness independent Drude peak shows only minor broadening at low In substitutions. However\, above x ∼ 0.05 they observe a sudden co llapse in the transport lifetime. This substitution level closely coincides with a maximum in the mid-infrared (MIR) absorption coefficient that can b e identified with the substitution level where the band gap closes\, the ba nd structure inverts\, and hence the topological class changes. They theref ore associate the collapse in the transport lifetime with the loss of topol ogical protection of surface states as the system enters the topologically trivial phase.\n\nHost: Dennis Drew\n\n\n\n LAST-MODIFIED:20230127T204932Z LOCATION:Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100216T181500Z DTEND:20100216T193000Z DTSTAMP:20260828T094430Z UID:kj3mumc9jgv7es2ge2rb7m7ehc@google.com CREATED:20100216T144748Z DESCRIPTION:Title : A Micro-Mechanical Approach to Disordered Soft Material s\nSpeaker Name: Professor Daniel Blair\nSpeaker Institution : Georgetown U niversity\nNotes: (As in the past\, each seminar will be preceded by an INF ORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 1108 a bout five minutes after 12:00 (Noon). \n LAST-MODIFIED:20230127T205040Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130405T130000 DTEND;TZID=America/New_York:20130405T140000 DTSTAMP:20260828T094430Z UID:63vbbgdpk77qe40rjng87laic4@google.com RECURRENCE-ID;TZID=America/New_York:20130405T130000 CREATED:20130108T151219Z DESCRIPTION:Title : Design and Fabrication of Membrane-Protein-Immobilized- Interfaces for Structural and Functional Characterization of Membrane Prote ins Using Neutron Scattering Technique\n\nSpeaker Name: Amit Vaish\n\nSpeak er Institution : NIST Center for Neutron Research\n\nAbstract : Membrane pr oteins are involved in the signal transduction of a wide range of physiolog ical processes from neuronal signaling to immune and hormonal response. Des pite being such an important pharmaceutical target\, structural characteriz ation of membrane proteins\, in particular G-protein-coupled receptors (GPC Rs)\, has been challenging by X-ray crystallography due to the difficulty a ssociated with crystallization of these proteins with surrounding lipids. A detailed structural understanding of the membrane proteins is required for rational design of therapeutics tailored towards finding cures for the dis eases caused by the malfunctions of these proteins. We are developing mater ials and methods to determine the structure-function relationship of membra ne proteins using surface-sensitive techniques. We have fabricated biomimet ic interfaces containing membrane proteins as a model system to study lipid -protein and protein-protein interactions. Our approach is based on self-as sembly of “chemical hook”-terminated molecules to selectively capture high density membrane proteins on the surface. Additionally\, we developed a nov el platinum nanotube membrane platform to provide high-surface area and flu idic lipid environment for surface-immobilized proteins for high-resolution structural information. LAST-MODIFIED:20230127T204752Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211123T180000Z DTEND:20211123T191500Z DTSTAMP:20260828T094430Z UID:6imdtki9ch18garohh2p5o96vl@google.com CREATED:20210913T184427Z LAST-MODIFIED:20230127T205028Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081117T190000Z DTEND:20081117T200000Z DTSTAMP:20260828T094430Z UID:a6m3ctrsbtne7d2ba70cev5qq4@google.com CREATED:20080915T191400Z DESCRIPTION:Speaker:Ian-Woo Kim\, University of Wisconsin\nWeb site: http:/ /www.wisc.edu/\nTitle:"TBA"\n LAST-MODIFIED:20230127T204558Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090203T181500Z DTEND:20090203T191500Z DTSTAMP:20260828T094430Z UID:ormc46oieb6ml7n7c2b7qb7jvo@google.com CREATED:20090129T211052Z DESCRIPTION:Title: Electron Transport in Metals with Liquid Crystal-Like Or dering\nSpeaker: Dr. Ted Kirkpatrick\, IPST\, University of Maryland\nMore Info: As in the past\, each seminar will be preceded by an Informal Cafeter ia Lunch to which all are welcome\, departing from Room 1108 about five min utes after 12:00 (Noon).\n\nContact:\nProfessor Christopher Jarzynski\, cja rzyns@umd.edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)40 5-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)-405-1610 LAST-MODIFIED:20230127T203944Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220217T160000Z DTEND:20220217T170000Z DTSTAMP:20260828T094430Z UID:0h2045q6f3ih5ajj3kuuv7vl2e@google.com CREATED:20220207T141936Z DESCRIPTION:Speaker: Dr. Claudia Hӧbartner\, Universität Wϋrzburg

      Ti tle: TBD


      Abstract: \;https: //chem.umd.edu/events/speaker-claudia-hobartner LAST-MODIFIED:20230127T204649Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121203T133000 DTEND;TZID=America/New_York:20121203T150000 DTSTAMP:20260828T094430Z UID:p5led18u6o5s6crj31ibe9kat8@google.com RECURRENCE-ID;TZID=America/New_York:20121203T133000 CREATED:20120921T203221Z DESCRIPTION:Title: "Gravitational-Wave Recoil: Consequences and Signatures in the Pre-LISA Era"\nSpeaker: Laura Blecha\nInstitution: UMD Astronomy\nAb stract: The asymmetric merger of two supermassive black holes (SMBHs) impar ts a\ngravitational-wave (GW) recoil kick to the merged SMBH. This kick may displace the SMBH from the galactic center or even eject it entirely. As G Ws from these events will not be directly observed in the near future\, we wish to focus on understanding the electromagnetic signatures of recoil tha t could be identified independently of a GW detection. I will describe the results of hydrodynamic galaxy merger simulations that include GW recoil\, focusing on the observable signatures of recoil\, the effects of galactic g as content on observability\, and implications for BH-galaxy co-evolution. Finally\, I will\ndiscuss observations and modeling of a recently-discovere d recoiling BH candidate that is the most promising such candidate to date. LAST-MODIFIED:20230127T205150Z LOCATION:4102 Physics Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Group Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101004T150000 DTEND;TZID=America/New_York:20101004T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20101004T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] Quarks and Leptons as Pseudo-Nambu-Goldstone Fermions\n [Speaker] Sourav K. Mandal\n[Institution] IPMU \n[Abstract] The hierarchy o f Yukawa couplings is an outstanding problem of the standard model. I discu ss a class of models in which the first and second generation fermions are SUSY partners of pseudo-Nambu-Goldstone bosons that parameterize a non-comp act Kahler manifold\, explaining the small values of these fermion masses r elative to those of the third generation. I show that various regions of th e parameter space give the correct dark matter abundance\, and that these r egions can be easily distinguished from conventional mSUGRA models at the LHC with only 7 fb^(-1) of integrated luminosity at 14 TeV. LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110309T210000Z DTEND:20110309T220000Z DTSTAMP:20260828T094430Z UID:6mc1tn2b0v2co04fl66pahibe0@google.com CREATED:20110301T184744Z DESCRIPTION:Title : Melon seed effect in collisionless magnetic reconnectio n\nSpeaker Name: Dr. Mikhail Sitnov\nSpeaker Institution : Johns Hopkins Ap plied Physics Laboratory\nAbstract : According to the present paradigm of c ollisionless magnetic reconnection\, the reconnection electric field penetr ates into the\ncurrent sheet near the X-line\, where it forms the electron diffusion region\, which may further elongate and become unstable with resp ect to the formation of the secondary magnetic islands. This picture is con firmed for the first time in full-particle simulations with open outflow bo undaries\, when the reconnection process develops as a result\nof the curre nt sheet thinning in a 2D self-consistent equilibrium with the X-line separ ating two magnetotails. Simulations also show\, that in equilibria\, where the X-line separates two seed regions with the enhanced magnetic flux\, the convection electric field\, which squeezes the current sheet\, penetrates directly to those seeds and accelerates them\, forming sharp magnetic pileu p structures known as dipolarization fronts. The effect resembles the eject ion of a melon seed squeezed between the thumb and fingers. It is consisten t with recent results on the linear stability of the tearing mode in magnet otail current sheets. It is also consistent with results of the statistical visualization of the Earth's magnetotail during the onset of substorms bas ed on Geotail data. LAST-MODIFIED:20230127T204109Z LOCATION:Energy Research Facility\, Bldg 223 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110928T200000Z DTEND:20110928T213000Z DTSTAMP:20260828T094430Z UID:u3llom5o7ov5eu1vt1fakig910@google.com CREATED:20110923T173104Z DESCRIPTION:Title : "HAWC Construction Progress and Science Outlook"\nSpeak er Name: Dr. Brian Baughman\nSpeaker Institution : University of Maryland LAST-MODIFIED:20230127T205035Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130425T173000Z DTEND:20130425T180000Z DTSTAMP:20260828T094430Z UID:rdb89krrd4cevj0c1krr6ec5gk@google.com CREATED:20130416T221501Z LAST-MODIFIED:20230127T204822Z LOCATION:Phys 1305F\, the "New" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120203T180000Z DTEND:20120203T190000Z DTSTAMP:20260828T094430Z UID:qqo1rgbi8lan83ah3ms7urs9ac@google.com CREATED:20120127T181107Z DESCRIPTION:Title : Hydroxyapatite/Multi-Walled Carbon Nanotube Composites for Bone Graft Applications\nSpeaker Name: Ashley A. White\nSpeaker Institu tion : National Science Foundation\nAbstract : As a biologically active cer amic\, hydroxyapatite (HA) is used in surgery to replace bone. While HA pro motes bone growth along its surface\, its mechanical properties are not suf ficient for major load-bearing medical devices. Carbon nanotubes (CNTs)\, a s one of the strongest and stiffest materials available\, have the potentia l to strengthen and toughen HA\, thus expanding the range of clinical uses for the material. Furthermore\, studies have suggested that the nanotubes t hemselves possess some bioactive properties.\nForming composites from this particular combination of materials presents unique challenges\, particular ly related to sintering\, which is necessary to form a dense\, strong monol ith. The high temperatures necessary for sintering can oxidize CNTs\, while the presence of water vapor or high pressure is necessary to retain HA’s p hase purity and hydroxylation. This talk will discuss production and charac terization of unsintered composite materials\, investigations into appropri ate sintering atmospheres and techniques\, evaluation of mechanical propert ies\, and in vitro cell culture.\nIn addition\, Dr. White will briefly disc uss her recent experiences in science policy\, including serving as an MRS- OSA congressional fellow in the U.S. Senate and her current position as a A AAS fellow in the Division of Materials Research at the National Science Fo undation. LAST-MODIFIED:20230127T204250Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110131T160000Z DTEND:20110131T170000Z DTSTAMP:20260828T094430Z UID:pga3lsuuftqrm5tlleb0j1c75s@google.com CREATED:20110126T152011Z DESCRIPTION:Title : Entanglement measures in quasi-2D quantum Hall states\n Speaker Name: John Biddle\nSpeaker Institution : University of Maryland LAST-MODIFIED:20230127T204551Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20081016 DTEND;VALUE=DATE:20081017 DTSTAMP:20260828T094430Z UID:d3jdk96q74f0j72hn3bddfi1f4@google.com CREATED:20081016T132310Z LAST-MODIFIED:20230127T205014Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Seminars Today TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110926T163000Z DTEND:20110926T173000Z DTSTAMP:20260828T094430Z UID:vr40p1hu6iabtts9ume0ej7dos@google.com CREATED:20110811T173823Z DESCRIPTION:Title: Superfluorescence from Ultrahigh-Density Magneto-exciton s in Quantum Wells\nSpeaker: Junichiro Kono\nInstitution: Departments of E lectrical & Computer Engineering and Physics & Astronomy\, Rice University\ , Houston\, Texas 77005\, U.S.A.\nAbstract: The spontaneous appearance of macroscopic coherence is among the most dramatic cooperative phenomena in p hysics. In quantum electrodynamics\, there exists a self-organization proc ess of fundamental importance\, called superfluorescence (SF)\, in which a collection of inverted atoms is incoherently prepared but macroscopic coher ence builds up spontaneously. The resultant macroscopic dipole decays supe rradiantly\, producing a burst of coherent radiation. SF has been observed in atomic gases and rarefied impurities in crystals but hitherto unobserve d in semiconductors because of ultrafast decoherence. Here\, we present ex perimental evidence for SF through cooperative recombination of ultrahigh-d ensity excitons in semiconductor quantum wells in a strong perpendicular ma gnetic field. At a critical magnetic field and excitation fluence\, we obs erve a sudden exciton depopulation accompanied by picosecond bursts of radi ation. In addition\, a clear transition from omnidirectional emission to a randomly directed but highly collimated beam was observed.\n LAST-MODIFIED:20230127T204627Z LOCATION:Physics\, room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Jun Kuno TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100907T200000Z DTEND:20100907T210000Z DTSTAMP:20260828T094430Z UID:rd4t0dpvep07i4a71epmrsiot0@google.com CREATED:20100825T173458Z DESCRIPTION:Speaker: Sid Nagel\, University of Chicago\nTitle: The Life and Death of a Drop: Topological Transitions and Singularities in Fluids\nAbst ract: The exhilarating spray from waves crashing into the shore\, the distr essing sound of a faucet leaking in the night\, and the indispensable role of bubbles dissolving gas into the oceans are but a few examples of the ubi quitous presence and profound importance of drop formation and splashing in our lives. They are also examples of a liquid changing its topology. Altho ugh part of our common everyday experience\, these transitions are far from understood and reveal delightful and profound surprises upon careful inves tigation. For example in droplet fission\, the fluid forms a neck that beco mes vanishingly thin at the point of breakup. This topological transition i s thus accompanied by a dynamic singularity in which physical properties su ch as pressure diverge. Singularities of this sort often organize the overa ll dynamical evolution of nonlinear systems. I will first discuss the role of singularities in the breakup of drops. I will then discuss the fate of t he drop when it falls and eventually splashes against a solid surface and e ventually evaporates. LAST-MODIFIED:20230127T204255Z LOCATION:Phys 1410 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100310T211500Z DTEND:20100310T224500Z DTSTAMP:20260828T094430Z UID:mi6nmfc821mm36sosg09enflu8@google.com CREATED:20100308T185416Z DESCRIPTION:Title : "Mu2e: Search for Muon to Electron Conversion at Fermil ab"\nSpeaker Name: Dr. Eric Prebys\nSpeaker Institution : Fermilab\n LAST-MODIFIED:20230127T203941Z LOCATION:PHYS 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090901T160000 DTEND;TZID=America/New_York:20090901T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20091208T210000Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com CREATED:20090819T165808Z DESCRIPTION:Speaker: Prof. Eun Suk Seo\, University of Maryland\n\nTitle: "New Results from Cosmic Ray Experiments". LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100930T161500Z DTEND:20100930T171500Z DTSTAMP:20260828T094430Z UID:nr0pg0b1hib4ff80uv41mci564@google.com CREATED:20100923T181300Z DESCRIPTION:Title: How Size and Cyclic Shear Determine the Strength of Soft Materials\nSpeaker Prof. Daniel Blair\nGeorgetown University LAST-MODIFIED:20230127T204711Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090403T180000Z DTEND:20090403T200000Z DTSTAMP:20260828T094430Z UID:ghgtjdk6cmqsvq1sidopnfdft0@google.com CREATED:20090311T173249Z DESCRIPTION:RSVP to 5-9307 or cjfisher@umd.edu by March 25th LAST-MODIFIED:20230127T205123Z LOCATION:CSS Building\, Room 4301 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics/Chemical Physics Reception TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100331T163000Z DTEND:20100331T173000Z DTSTAMP:20260828T094430Z UID:ir8q1k9f2ce7hdcjalv0n1pbfg@google.com CREATED:20100223T154820Z DESCRIPTION:SPEAKER: Iain Stewart\n\nAFFILIATION: Massachusetts Inst of T echnology\, Cambridge\n\nTITLE: Determining alphas(mZ): New Precision Res ults from Jets\n\nABSTRACT: Using effective field theory\, a high precisi on analysis is carried out for the extraction of alphas(mZ) from jets in e+ e- collisions. A global fit is performed accounting for both perturbative a nd power corrections and using thrust event shape data from center of mass collision energies Q = 35 GeV to Q = 207 GeV. The analysis includes 3-loop fixed order QCD results\, a summation of large logs at N^3LL order\, non-pe rturbative hadronization effects from field theory matrix elements \nand fa ctorization\, bottom mass effects\, QED effects\, and the effect of the top -mass dependent axial anomaly. My talk contains a description of all this ( and more) with a lot of pictures for both theory and data. The total unce rtainty on alphas(mZ) is 0.9% and the central value might \nsurprise you. A key improvement that allows for such high precision is that power correct ions are accounted for by field theory and fits rather than Monte Carlo mod eling. \n LAST-MODIFIED:20230127T204528Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100429T153000Z DTEND:20100429T163000Z DTSTAMP:20260828T094430Z UID:kgm5536vq08lbl9e5s4fedfgr8@google.com CREATED:20100304T133806Z DESCRIPTION:SPEAKER: Bira van Kolck\n\nAFFILIATION: Univ of Arizona\, Tucs on\n\nTITLE: Hadronic Time-Reversal Violation\n\nABSTRACT: Several exper iments have been proposed with considerably increased sensitivity to electr ic dipole moments (EDMs) of hadrons and nuclei. If a non-zero EDM is found at a level significantly above that expected\nfrom the CKM matrix\, one wou ld like to identify the new \nmechanism(s) of time-reversal violation (TV). It would be useful to develop a theoretical framework to correlate \nlow-e nergy TV observables involving strongly-interacting particles.\n\nWe extend nuclear chiral effective field theory to include\nvarious TV operators at the quark level. Chiral constraints are shown to be important. As an exampl e of the formalism\, we discuss the nucleon electric dipole and the TV pion -nucleon form factors. LAST-MODIFIED:20230127T205113Z LOCATION:Physics 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091216T160000Z DTEND:20091216T170000Z DTSTAMP:20260828T094430Z UID:fd0rup2r4k8aku3t8uhltgkat8@google.com CREATED:20091207T154433Z DESCRIPTION:Title : The Feynman propagator on a causal set\nSpeaker Name: S teven Johnston\nSpeaker Institution : Imperial College\nAbstract : How sure are you that spacetime is continuous? In one approach to quantum gravity\, causal set theory\, spacetime is modeled as a discrete structure: a causal set. This talk begins with a brief introduction to causal sets\, then desc ribes a new approach to modeling a quantum scalar field on a causal set. We obtain the Feynman propagator for the field by a novel procedure starting with the Pauli-Jordan commutation function. The candidate Feynman propagato r is shown to agree with the continuum result. This model opens the door to physical predictions for scalar matter on a causal set.\n LAST-MODIFIED:20230127T204937Z LOCATION:PHYS 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravitation Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100119T210000Z DTEND:20100119T220000Z DTSTAMP:20260828T094430Z UID:if2kl2373mavc71723f4lt3f0o@google.com CREATED:20100111T174856Z DESCRIPTION:Speaker: Sarah Eno\, University of Maryland\nTitle: "Start up o f the Large Hadron Collider"\nAbstract: The Large Hadron Collider\, a proto n-proton collider located in Geneva\,\nSwitzerland\, has finally commenced operation\, thus opening the way\ntowards the first new laboratory-based en ergy frontier since the\ncommissioning of the Tevatron in mid-1980’s. Prec ision low-energy\nmeasurements\, cosmological data\, and theoretical consid erations all\nsuggest that the "Terascale" energies it will probe should co ntain new\nphysics beyond the standard model. In this talk\, I will discus s\nstudies of the new data from the LHC LAST-MODIFIED:20230127T205011Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110415T190000Z DTEND:20110415T200000Z DTSTAMP:20260828T094430Z UID:nq5fbkae4dvop9gd93rovhq520@google.com CREATED:20110413T154504Z DESCRIPTION:Title: "Controlled Interactions Between Quantum Dots and Light Using Photonic Crystals"\nSpeaker: Prof. Edo Waks\, Department of Electrica l and Computer Engineering\, Institute for Research in Electronics and Appl ied Physics\, University of Maryland\nAbstract: Quantum dots (QDs) are stab le\, bright\, semiconductor based light emitters that exhibit a quantized e nergy spectrum. For these reasons they are excellent candidates for develop ment of lasers\, nonlinear optoelectronic components\, and basic building b locks for future quantum information technology. Such applications critical ly depend on the ability to create strong interactions between QDs and phot on fields. One method to engineer these strong interactions is to use photo nic crystal structures. Photonic crystals are materials with a periodic ind ex of refraction that can guide and confine light on the size scale of an o ptical wavelength\, resulting in extremely strong atom-photon interactions. In this talk I will discuss our recent work on interactions between quantu m dots and photonic crystals. I will describe how such interactions can lea d to ultra low-power all-optical switching\, and how this switching can be extended to implement quantum computation on a semiconductor chip. I will d iscuss our efforts to realize these quantum devices by exploiting spin prop erties of QDs under magnetic fields. LAST-MODIFIED:20230127T204624Z LOCATION:Jeong H. Kim Engineering Building\, Rm. 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Booz Allen Hamilton Distinguished Colloquium in Electrical and Comp uter Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131004T170000Z DTEND:20131004T180000Z DTSTAMP:20260828T094430Z UID:fm0bbhvfjmadol03er7vmd36vg@google.com CREATED:20131001T194142Z DESCRIPTION:Title : Aspects of Applied Nuclear Physics at the Johns Hopkins Applied Physics Laboratory\n\nSpeaker Name: Christopher M. Lavelle\n\nSpea ker Institution : Applied Physics Laboratory\, The Johns Hopkins University \n\nNotes: This is a Materials Science and Engineering seminar.\n\nAbstract : he Johns Hopkins University Applied Physics Laboratory began its existen ce in service to US government during WWII. Operating secretly out of the W olf Motor Company building in Silver Spring\, Md\, APL developed the variab le time proximity fuze which played a decisive role in the war effort.\n\nJ HU/APL now has a greatly expanded role\, providing an important center of k nowledge\, source of new technologies\, and acts as a trusted agent in serv ice to government sponsors. In particular\, my work presently focuses on th e rapid prediction and detection of neutron radiation in complex environmen ts.(1) This talk will highlight recent collaborative efforts in a new appro ach to 3He replacement by researchers at the University of Maryland\, NIST\ , and JHU/APL.\n\nThis unique approach(2) indirectly detects neutrons via n oble gas excimers which form in response to ionization. The excimer is shor t lived\, and emits detectable UV light as it dissociates. The challenges a nd opportunities of new materials(3) and detector designs together with thi s technique will be presented.\n\n1. C. M. Lavelle\, D. Bisson\, J. Gilliga n\, B. M. Fisher\, and R. M. Mayo\, "Parameterized Radiation Transport Mode l for Neutron Detection in Complex Scenes\," IEEE Trans. Nucl. Sci. 60 (2)\ , 503-509 (2013).\n\n2. Patrick P. Hughes\, Michael A. Coplan\, Alan K. Tho mpson\, Robert E. Vest\, and Charles W. Clark\, "Far-ultraviolet signatures of the [sup 3]He(n\,tp) reaction in noble gas mixtures\," Appl. Phys. Lett . 97 (23)\, 234105-234103 (2010).\n\n3. C. M. Lavelle\, Ryan M. Deacon\, Da niel S. Hussey\, Michael Coplan\, and Charles W. Clark\, "Characterization of boron coated vitreous carbon foam for neutron detection\," Nucl. Instrum . Meth. A 729 (0)\, 346-355 (2013).\n LAST-MODIFIED:20230127T204051Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130502T180000Z DTEND:20130502T193000Z DTSTAMP:20260828T094430Z UID:02ru9l3nu1375085f0ee65fe54@google.com CREATED:20130424T181506Z DESCRIPTION:Speaker Name: Leonid Glazman\, Yale University\n\nTitle: Nonli near Quantum Liquids in One Dimension\n\nAbstract: The conventional descri ption of one-dimensional quantum fluids is based on the Luttinger liquid th eory. In that theory\, the true energy-momentum relation of particles ma king up the fluid is replaced by a linear one. This simplification is cruci al for the theory\, and abandoning it has proven to be difficult. The talk presents a breakthrough which allowed one to circumvent the difficulty. The new theory describes dynamic responses of a fluid consisting of particles with a generic spectrum. It is applicable to a diverse group of systems\, i ncluding\, for example\, electrons in quantum wires and cold atomic gases i n one-dimensional traps.\n\nHost: Victor Galitski LAST-MODIFIED:20230127T204046Z LOCATION:Phys Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111017T200000Z DTEND:20111017T210000Z DTSTAMP:20260828T094430Z UID:s8uj38r7lnlaqbcrbo8p678aso@google.com CREATED:20111007T125909Z DESCRIPTION:Title : Self-Organization in Animal Development: Two Vignettes\ nSpeaker Name: Dr. David Lubensky\nSpeaker Institution : University of Mich igan\nNotes: Refreshments served at 3:45pm\n LAST-MODIFIED:20230127T204746Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120406T170000Z DTEND:20120406T180000Z DTSTAMP:20260828T094430Z UID:7nivg7tmiaq7nggjkhbs25quvc@google.com CREATED:20120309T202413Z DESCRIPTION:Title : X-ray Atomic-Scale Structural Studies of Interfaces wit h Chemical-State Sensitivity\nSpeaker Name: Michael J. Bedzyk\nSpeaker Inst itution : Northwestern University\nAbstract : Interfacial science by its ve ry nature brings together diverse interests in areas such as: electronic ma terials\, oxide film growth\, nano-science\, biomembranes\, geochemistry\, surface physics\, catalysis\, and electrical-energy storage. Sophisticated in situ X-ray methods are now being developed to understand the assembly of atoms\, molecules and supported nanoparticles at well-defined interfaces i n complex environments. The talk will introduce the use of synchrotron X-ra y methods for atomic-scale studies of interfaces. Examples will include the use of X-ray reflectivity (XRR)\, X-ray standing waves (XSW) and X-ray pho toelectron spectroscopy (XPS) for studying interfaces formed by the growth of graphene on silicon-carbide and metallic monolayers on oxide single crys tal surfaces. For epitaxial graphene grown on the Si-face of SiC(0001)\, XP S shows a number of distinct chemically-shifted C 1s peaks that when monito red individually under the XSW condition are shown to corres\npond to C ato ms located in different sites including the controversial interface layer t hat lies between the substrate surface and first graphene layer. For the ca se of an oxide supported monolayer catalyst\, VOX on α-TiO2(110)\, we are a ble to correlate the redox-induced interfacial chemical-state changes of th e V ions (observed by XPS) with their atomic-scale structural changes (obse rved by XSW 3D atomic imaging). In both cases the chemically-specific struc tural measurements are well-suited for testing modeled theoretical predicti ons and for complimenting local-probe imaging methods. The measurements wer e made at the Advanced Photon Source and the European Synchrotron Radiation Facility. LAST-MODIFIED:20230127T204437Z LOCATION:Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100218T193000Z DTEND:20100218T203000Z DTSTAMP:20260828T094430Z UID:nni41tfknvb5nbblh1id176amc@google.com CREATED:20100208T170636Z DESCRIPTION:[Speaker] Benjamin Owen\n[Institution] Center for Gravitational Wave Physics\, Pennsylvania State University\n[Title] "Why LIGO results ar e already interesting" LAST-MODIFIED:20230127T205136Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091130T161500Z DTEND:20091130T171500Z DTSTAMP:20260828T094430Z UID:uutir76cta9fffo1q46851pugk@google.com CLASS:PUBLIC CREATED:20091030T135441Z DESCRIPTION:Title: Resonant Dark Matter\nSpeaker: Yang Bai\nSpeaker Institu te: Fermilab\, Batavia IL\nAbstract: We propose an alternative form of dar k matter-nucleus scattering which only probes a narrow range of dark matter velocities due to the \nexistence of a resonance\, a dark matter-nucleus b ound state. The scattering cross section becomes highly element dependent\, has increased modulation and as a result can explain the DAMA/LIBRA result s whilst not being in \nconflict with other direct detection experiments. LAST-MODIFIED:20230127T204039Z LOCATION:Physics Rm. 2202 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:TQHN Informal Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20091110T140000Z DTEND:20091110T220000Z DTSTAMP:20260828T094430Z UID:d6t38cb0kntlqkcffvbniq2udc@google.com CREATED:20091022T182208Z DESCRIPTION:9:00 am Ken Dill\, UC San Francisco\, “Maximum Caliber—the\nsto chastic dynamics of few-particle systems”\n9:50 am Doug Barrick\, Johns Hop kins University\, “Using repeat\nproteins to dissect cooperatively and its role in protein\nfolding”\n11:00 am Jasna Brujic\, New York University\, “F orce-clamp technique\nfor accurate recording of single protein folding kine tics”\n11:50 am Dave Thirumalai\, University of Maryland\, “Universality an d\nSpecificity in Protein Folding”\n1:30 pm William A. Eaton\, National Ins titutes of Health\, “Ultrafast\nProtein Folding”\n2:30 pm Lila Gierasch\, U niversity of Massachusetts\, “Moving the\nprotein folding problem from the test tube to the cell”\n3:30 pm George H. Lorimer\, University of Maryland\ , “The GroELS\nnanomachine: allostery\, time and distance scales matter!”\n 3:55 pm Jose Onuchic\, UC San Diego\, “The energy landscape for\nprotein fo lding\, function and biomolecular machines” LAST-MODIFIED:20230127T204420Z LOCATION:Room 1103 Biosciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Second Annual Cohen Foundation Biophysics Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100203T170000Z DTEND:20100203T180000Z DTSTAMP:20260828T094430Z UID:joqdo09l3397hr5q3tvod8j78s@google.com CREATED:20100125T182643Z DESCRIPTION:Title : AppEl Seminar - Plasmon Resonances in Nanoparticles\nSp eaker Name: Isaac Mayergoyz\nSpeaker Institution : University of Maryland\n LAST-MODIFIED:20230127T205236Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110311T180000Z DTEND:20110311T190000Z DTSTAMP:20260828T094430Z UID:f36mnqp6vfmcfm9njf9km8h6s0@google.com CREATED:20110303T134228Z DESCRIPTION:Title : Materials Seminar: Structure-Function of Gum Polymers\n Speaker Name: Mar Nieto\nSpeaker Institution : TIC Gums\nAbstract : Abstrac t TBA. Please see http://www.mse.umd.edu/events/index.php?mode=4&id=5571 fo r updates. LAST-MODIFIED:20230127T204008Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111103T173000Z DTEND:20111103T180000Z DTSTAMP:20260828T094430Z UID:prs75lo8gb7jil399u0ej3u3gk@google.com CREATED:20110914T204655Z LAST-MODIFIED:20230127T205133Z LOCATION:Rm. 1305F\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101013T180000Z DTEND:20101013T190000Z DTSTAMP:20260828T094430Z UID:m6gdqme9gec3n2b1fhotsdcg9k@google.com CREATED:20100927T161231Z DESCRIPTION:[Title] Searches for the Standard Model Higgs Boson at the Teva tron\n[Speaker] Tom Junk \n[Institution] Fermilab\n[Abstract] The spectacul ar performance of the Fermilab Tevatron in recent years has allowed the exp loration of new subjects in particle physics\, and it has allowed us to tes t for the presence of the Standard Model Higgs boson in an important mass r ange.\nI will briefly review the current status of theoretical predictions of the Higgs boson production rates and decay branching fractions that we u se\, and describe the searches CDF has performed\, as well as the combinati on techniques and results.\n[Note] Lunch will be served at 12:30pm in room 1305F (new Toll room) LAST-MODIFIED:20230127T204111Z LOCATION:1305F Physics building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary particle Theory Sminar Joint with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131021T180000Z DTEND:20131021T190000Z DTSTAMP:20260828T094430Z UID:3hcuacne7clpojg7f5dg8hf67o@google.com CREATED:20131017T122632Z DESCRIPTION:Speaker: Anton Akhmerov of Technical University of Delft in th e Netherlands \n\nTitle: "Numerics of quantum transport"\n\nAbstract: Calcu lating various transport properties is as easy as writing down a linear sys tem of tight-binding equations and solving it. Despite it sounds simple\, b oth parts of this task turn out to be difficult. I will discuss the problem s that one encounters in each step. These are not just the issues of numer ical efficiency and stability\, but also the task of translating from a phy sical problem to the corresponding linear system of equations. I will intro duce the software package Kwant\, which is the solution to these problems t hat me and my collaborators have developed. I will also show its applicatio ns to topological superconductors\, Majorana nanowires and graphene. LAST-MODIFIED:20230127T205225Z LOCATION:Physics 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100909T200000Z DTEND:20100909T213000Z DTSTAMP:20260828T094430Z UID:e6bmjb5r610odcitv57b3kl0hg@google.com CREATED:20100826T141241Z DESCRIPTION:[Title] "String theory and the real world"\n[Speaker] Prof. Gor don Kane\n[Institution] University of Michigan\n[Abstract] In this talk I'l l describe how string theory is exciting because it can address most or all of the questions we hope to understand about the quarks and leptons that m ake up our world\, the forces that form our world\, cosmology\, CP violatio n\, and more. I’ll explain why string theory is testable in basically the s ame ways as the rest of physics\, and why much of what is written about tha t is misleading. String theory is already or soon being tested in several w ays\, including dark matter\, LHC physics\, neutrino physics\, cosmological history\, and more\, from work in the increasingly active subfield "string phenomenology". \n LAST-MODIFIED:20230127T204926Z LOCATION:Room 1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110824T140000Z DTEND:20110824T150000Z DTSTAMP:20260828T094430Z UID:37vl0j4tkt3jj0i4v6tb6drfrg@google.com CREATED:20110808T152630Z DESCRIPTION:Title: Probe Based Optical Imaging Toward Translational In Vivo Study\nPresented by Woonggyu Jung\, Ph.D.\nBeckman Institute for Advanced Science and Technology\nUniversity of Illinois\, Urbana-Champaign\nProbe-ba sed imaging means minimally invasive\, portable and fast imaging techniques for diagnosing diseases or monitoring tissues. It requires practical perfo rmances such high resolution\, real time visualization of specific tissue r egions rather than full visualization of large area. The concept of probe-b ased imaging is getting important\, and is used very broadly\, because cont inuous tissue monitoring can provide accurate diagnosis\, clear determinati on of the surgical area\, and confirmation of the surgical margin after a p rocedure.\nOptical imaging inherently offers many advantages which are well suited for probe-based imaging: (1) higher spatial resolution and sensitiv ity\, (2) tissue and molecular information based on scattering\, absorption \, and fluorescence\, (3) availability of contrast agents for specific targ eted biomarkers\, and (4) lower costs. Furthermore\, implementation using f iber optics can offer portability and accessibility for in vivo application s. Thus\, optical imaging technique has a potential to provide ideal platfo rm for probe-based diagnostics and image-guided treatments. However\, trans lation from laboratory settings to clinical environment poses unique engine ering challenges such as miniaturization of probes\, real-time speed requir ements. Solving these challenges often requires the state-of-the-art tools including micro-optics and MEMS technologies.\nThis presentation covers the latest work of probe-based high resolution optical imaging using optical c oherence tomography (OCT) and multiphoton microscopy (MPM) for in vivo clin ical applications. Specifically\, the talk will highlight handheld OCT for primary care medicine and fiber based compact MPM. Long term objective of t hese researches is to use complementary imaging systems to better assess th e biological specimen and to enable clinical diagnosis.\nAbout the Speaker: \nWoonggyu Jung received his Ph. D. in 2008 from the Department of Biomedic al Engineering at the University of California\, Irvine. From 2001 to 2008\ , he worked at the Beckman Laser Institute and Medical Clinic at UC Irvine\ , which is one of the world’s top research organizations in laser treatment and diagnosis. He currently is a postdoctoral researcher at the Beckman In stitute for Advanced Science and Technology at the University of Illinois a t Urbana-Champaign since January 2009.\nDr. Jung has a strong research back ground in optical imaging technologies including optical coherence tomograp hy (OCT)\, multiphoton microscopy (MPM)\, and miniaturized optical imaging probes. His research interest is to develop new optical technologies that a ddress challenges in clinical medicine and basic biological research. His l ong-term goal is to pursue implementation of research tools for in vivo tra nslational studies\, where functionalities such as real-time measurement\, compactness and portability are essential. In previous work\, he developed a successful platform of probe-based compact optical imaging systems for in vivo translational research\, and has published more than 30 peer-reviewed journal papers in the field of biophotoics. LAST-MODIFIED:20230127T204313Z LOCATION:Room 1107 Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081208T160000Z DTEND:20081208T170000Z DTSTAMP:20260828T094430Z UID:e85nbd3dd02ls0ru8tdc6boreg@google.com CREATED:20081121T161555Z DESCRIPTION:Title: Research Priorities and Future Directions for the Army R esearch Lab\nSpeaker: John Miller\, Director of the Army Research Lab LAST-MODIFIED:20230127T204601Z LOCATION:Marie Mount\, Room 0100 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Research Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121018T163000Z DTEND:20121018T173000Z DTSTAMP:20260828T094430Z UID:e0f62gupqntff0o3jnombhi4os@google.com CREATED:20121012T192151Z DESCRIPTION:Title: Identifying the Drivers of Cancer in Gene Regulatory Net works\nSpeaker: John Platig\nUniversity of Maryland\nDepartment of Physics LAST-MODIFIED:20230127T204410Z LOCATION: IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120216T190000Z DTEND:20120216T200000Z DTSTAMP:20260828T094430Z UID:9cuka5ovtllj2mmad4igevm2jg@google.com CREATED:20120208T205023Z DESCRIPTION:Title : New Directions for Neutrino Physics Using Non-Cryogenic Liquid Tracking Detectors\nSpeaker Name: Matthew Wetstein\nSpeaker Institu tion : Argonne National Laboratoy and University of Chicago\nAbstract : The neutrino physics community faces stark technological tradeoffs between con ventional detectors that offer large target volumes but poor resolution\, a nd advanced\, high resolution detector systems with limited scalability. In this talk\, I present a third way. By fundamentally reinventing the photod etector\, it becomes possible to develop high-resolution Water Cherenkov (W C) or scintillation-based neutrino detectors capable of more complete event reconstruction using precision measurements of the positions and drift tim es of optical photons. I will give a brief overview of the Large Area Picos econd Photodetector (LAPPD) project\, an effort to develop compact\, microc hannel plate (MCP) photomultiplier tubes capable of sub-millimeter\, sub-na nosecond spatial resolutions and with potential for scalability to large ex periments. I will also discuss steps taken towards the design and construct ion of experimental LAPPD-based neutrino detectors\, and the potential appl ications for such detector systems in answering the important questions of neutrino physics. LAST-MODIFIED:20230127T204350Z LOCATION:4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100429T193000Z DTEND:20100429T203000Z DTSTAMP:20260828T094430Z UID:lk699dncq51ipb4g00aotobjeg@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lbk660 a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100310T195408Z DESCRIPTION:[Speaker] Michel Janssen\n[Institution] University of Minnesota \n[Title] Jordan and the wave-particle duality of light\n[Abstract] In 1909 \, Einstein derived a formula for the mean-square energy fluctuation in bla ck-body radiation. This formula is the sum of a wave term and a particle te rm. In a famous joint paper with Born and Heisenberg submitted in late 1925 \, Pascual Jordan used the new matrix mechanics to show that one recovers b oth these terms in a simple model of quantized waves. This result not only solved Einstein's puzzle about the wave-particle duality of light\, it also provided striking evidence for matrix mechanics and a strong argument for field quantization. After reviewing Einstein's early work on fluctuations i n black-body radiation\, I present Jordan's result and the curious story of its reception. Rather than being hailed as a major contribution to quantum theory\, Jordan's result met mostly with skepticism\, even from his co-aut hors. I will argue that the skeptics were wrong.\n\nBased on: A. Duncan and M. Janssen\, "Pascual Jordan's resolution of the conundrum of the wave-par ticle duality of light." Studies in History and Philosophy of Modern Physic s 39 (2008): 634-666.\nPascual Jordan’s resolution of the conundrum of the wave-particle duality of light LAST-MODIFIED:20230127T204300Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090226T181500Z DTEND:20090226T221500Z DTSTAMP:20260828T094430Z UID:n31ns1s15ad7kc0l4j034bc5cc@google.com CREATED:20090219T203906Z DESCRIPTION:More Information: Agenda: \n1:15pm – 2:00pm Computing/CUDA Fu ndamentals - NVIDIA\n2:00pm – 3:15pm Research Topics with CUDA\n3:15pm – 3: 45pm Demos and Q&A\n\nJoin us for an overview of GPU Computing\, the CUDA p arallel programming model\, and Tesla GPU computing products for computatio nal scientists and researchers.\n\nA variety of speakers from academia and research will talk about their experience using CUDA and ongoing work with GPU computing. In addition\, NVIDIA® will be present to offer a demonstrati on of the Tesla Personal Supercomputer. LAST-MODIFIED:20230127T204435Z LOCATION:A.V. Williams Building\, Room 2460 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NVIDIA Heterogeneous Computing Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110728T180000Z DTEND:20110728T190000Z DTSTAMP:20260828T094430Z UID:q99clm12pnk9ob5j9k2id8odbk@google.com CREATED:20110721T184224Z DESCRIPTION:Title: "N-Higgs-doublets extension of the SM: symmetries and CP V"\nSpeaker: Celso Nishi\nInstitution: Universidade Federal do ABC LAST-MODIFIED:20230127T204757Z LOCATION:4102 Physics Bldg SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120426T180000Z DTEND:20120426T193000Z DTSTAMP:20260828T094430Z UID:l6d57dmglkldpvi8gnkf12njoo@google.com CREATED:20120118T182946Z DESCRIPTION:Speaker: Jennifer Hoffman\, Harvard\nTitle: Imaging the impact of single dopants on high-Tc superconductors\nAbstract: High-Tc cuprate sup erconductors display startling nanoscale inhomogeneity in essential propert ies such as pseudogap energy scale\, Fermi surface\, and even superconducti ng critical temperature. The direct cause of this inhomogeneity has remaine d mysterious\; theoretical explanations have ranged from chemical disorder to spontaneous electronic phase separation. We have doubled the energy ran ge of scanning tunneling spectroscopy\, allowing the first complete mapping of all three types of oxygen dopants in Bi2+ySr2-yCaCu2O8+x with maximum s uperconducting Tc ~ 90K. I will explain how the spatial variations in compe ting electronic orders\, such as the pseudogap and the charge density wave\ , are governed by the disorder in the dopant concentrations\, particularly vacancies in the apical oxygen site. I will also discuss work in progress on imaging single dopants the iron-based high-Tc superconductor \nPrxCa1-xF e2As2.\n\n \n\nHost: Johnpierre Paglione\n LAST-MODIFIED:20230127T204035Z LOCATION:Rm 1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090422T150000Z DTEND:20090422T160000Z DTSTAMP:20260828T094430Z UID:vnucsj6bqd7mea4u5sqb1mooj8@google.com CREATED:20090413T144528Z DESCRIPTION:Title: Controlled Femtosecond Electrical Currents in Single Mol ecule Nanowires\nSpeaker: Paul Brumer\, University Professor and Roel Buck Professor of Chemical Physics\, Chemical Physics Theory Group\, Department of Chemistry\, University of Toronto\nMore Information: Abstract: We develo p a method to produce femtosecond pulses of directed electrical current in single molecule nanowires. The method relies on symmetry breaking attribute s of one photon plus two photon excitation\, and overcomes significant prob lems associated with vibrationally induced decoherence of the electron dyna mics. We will introduce the method\, discuss prior failures\, and describe computational results on a polyacetylene wire that shows the efficiency and promise of our proposed approach. LAST-MODIFIED:20230127T205150Z LOCATION:Energy Research Building\, IREAP Seminar Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110315T200000Z DTEND:20110315T210000Z DTSTAMP:20260828T094430Z UID:2n13q0b8f7pb6ll7gh27sjul2k@google.com CREATED:20110303T145344Z DESCRIPTION:Title: Fiat Lux: Light from Bubbles\, X-rays from Peeling Tape and Nuclear Fusion from Crystals\nSpeaker: Seth Putterman\, University of C alifornia\, Los Angeles\nAbstract: The approach to equilibirum can sample r egions of phase space that are characterized by dramatic energy focusing ph enomena. Sonoluminescence is a paradigm of transdisciplinary physics. Low a mplitude sound energy entering a fluid spontaneously focuses by 12 orders o f magnitude to create a flash of light and a new phase of matter. The degre e to which the energy density of a continuous system can concentrate in off -equilibrium motion has not been determined by first principles. The same t heoretical limitations apply to ferroelectricity and tribo-electrification. In these cases the input of diffuse energy has been shown to lead to nucle ar fusion and x-ray emission. The limitations of the reductionist approach to these issues is emphasized. LAST-MODIFIED:20230127T204143Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120502T181500Z DTEND:20120502T191500Z DTSTAMP:20260828T094430Z UID:tikk1it0p65jm5qcbm4vu80oqo@google.com CREATED:20120206T191955Z DESCRIPTION:SPEAKER: Shina Tan - Georgia Inst of Technology\, Atlanta\nTIT LE: Beyond The Efimov Effect for Three Particles in Three Dimensions\nABST RACT: The Efimov effect was traditionally thought to exist for\nthree or mo re particles in three spatial dimensions only. In this\nseminar I will exp lore the much larger landscape of universal few-body\nbound states of parti cles with short-range resonant interactions. The\nkey ideas are that one ca n use potentials to constrain the spatial\nmotion of particles (so that dif ferent particles may move in different\nor the same dimensions)\, and that one can consider three-body or even\nfour-body short-range interactions. I n this way\, one can have Efimov\neffect in one spatial dimension. One can even have universal shallow\nbound states of TWO particles only\, whose en ergies form a geometric\nsequence\, without using a static point impurity o r a spatially\ndependent scattering length.\n LAST-MODIFIED:20230127T204327Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121105T164500Z DTEND:20121105T173000Z DTSTAMP:20260828T094430Z UID:mr6rl4q4e1g6nmkjsgb93r0fgs@google.com CREATED:20121025T142403Z LAST-MODIFIED:20230127T204432Z LOCATION:Physics 1305 F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120307T140000 DTEND;TZID=America/New_York:20120307T150000 DTSTAMP:20260828T094430Z UID:5qccqb6j2fmi41rqs4a91pqlg8@google.com RECURRENCE-ID;TZID=America/New_York:20120307T140000 CREATED:20120119T153900Z LAST-MODIFIED:20230127T205209Z LOCATION:CSIC Bldg (#406) Room 4122 at 2.00pm SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081008T200000Z DTEND:20081008T213000Z DTSTAMP:20260828T094430Z UID:ab3upei6snaldjasgtg2t5bblg@google.com CREATED:20080912T171728Z DESCRIPTION:Speaker: Jacobus Verbaarschot\, Stony Brook University\, New Yo rk\nTitle: "The Sign Problem in QCD at Nonzero Baryon Density"\nMore Inform ation: http://tonic.physics.sunysb.edu/~verbaarschot/\nContact Loretta Robi nette ((301) 405-6115)\nWeb site: http://www.physics.umd.edu/tqhn\n LAST-MODIFIED:20230127T204943Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN/ENP SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120103T173000Z DTEND:20120103T190000Z DTSTAMP:20260828T094430Z UID:rvf2uorek11fss5mi0br01mpok@google.com CREATED:20111221T140425Z DESCRIPTION:SPEAKER: Sichun Sun - Univ of Washington\, Seattle\n \nTITLE: Effective Field Theory Approach to Equation of States and Strongly Coupled Systems\n \nABSTRACT: We developed a new method to calculate viral equation of states\, by using finite temperature field theory from a nonrealistic e ffective Lagrange. It is suitable for strongly coupled systems and the summ ation of infinite three-loop diagram could be done \nanalytically for a uni tary fermion gas.\n LAST-MODIFIED:20230127T204052Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081201T173000Z DTEND:20081201T183000Z DTSTAMP:20260828T094430Z UID:cvgd684es52smjfo03hd89rg7o@google.com CREATED:20080915T192018Z DESCRIPTION:Speaker:Susan Coppersmith\, University of Wisconsin\nTitle:"Pro spects for quantum computing with silicon quantum dots by Susan Coppersmith "\n\n LAST-MODIFIED:20230127T205141Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121105T173000Z DTEND:20121105T183000Z DTSTAMP:20260828T094430Z UID:cd5gu3vj75ndfun3lhsbu5u528@google.com CREATED:20121025T142619Z DESCRIPTION:Title: Single-atom spin qubits in silicon \nSpeaker: Andrea Mor ello\n ARC Centre of Excellence Centre for Quantum Computation and Communic ation Technology\, School of Electrical Engineering and Telecommunications\ , \nThe University of New South Wales\, Sydney NSW 2052\, Australia\nThe id ea of using the spin of a single donor atom in silicon to encode quantum in formation goes back to the Kane proposal [1] in 1998. The proposal was moti vated by two observations: (i) Silicon is one of the most promising materia ls to host spin qubits in solid state\, owing to the very weak spin-orbit c oupling\, and to the possibility to eliminate decoherence from nuclear spin s by isotopic purification\; (ii) A trillion-dollar worth industry already exists\, that has developed extraordinary tools to manufacture silicon nano scale devices in a reliable and cost-effective way. \nThe proposal appeared ambitious\, visionary but very challenging at the time\, because it relied upon the non-trivial assumption that the progress in the fabrication of cl assical silicon devices could be harnessed to pursue quantum information go als. Indeed\, over a decade of intense efforts has been necessary before th e first breakthroughs in silicon quantum technologies could be demonstrated .\nI will present the first experimental demonstration of a qubit based on a single phosphorus atom in silicon. The atom is coupled to a silicon Singl e-Electron Transistor\, and the whole device is fabricated retaining standa rd CMOS technologies such as ion implantation [2] and metal gates fabricate d on top of high-quality silicon oxide [3].\nIn a single-atom device\, we h ave demonstrated single-shot readout [4] and coherent control [5] of the do nor electron spin\, as well and the spins of the 31P nucleus and of a stron gly-coupled 29Si nucleus. All three qubits exhibit excellent coherence and high-fidelity readability\, with the nuclear ones being accessible through a quantum nondemolition measurement. \nThese results represent major milest ones in the search for a scalable and coherent quantum computer platform\, and confirm the vision of silicon as the choice material for both quantum a nd classical technologies.\n[1] B. E. Kane\, Nature 393\, 133 (1998).\n[2] D. N. Jamieson et al.\, Appl. Phys. Lett. 86\, 202101 (2005).\n[3] A. Morel lo et al.\, Phys. Rev. B 80\, 081307(R) (2009).\n[4] A. Morello et al.\, Na ture 467\, 687 (2010).\n[5] J. J. Pla et al.\, Nature 489\, 541 (2012).\n LAST-MODIFIED:20230127T204717Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Andrea Morello TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110418T163000Z DTEND:20110418T173000Z DTSTAMP:20260828T094430Z UID:ub69fklh6m49ea3d622ggb6s44@google.com CREATED:20110329T174746Z DESCRIPTION:Title: "Transforming light polarization into matter-spin-qubits and back\, using\nsingle\, semiconductor quantum dots"\nSpeaker: David Ger shoni\nInstitution: the Physics Department and the Solid State Institute\, Technion - Israel Institute of Technology\, Haifa\, 32000\, Israel and\nThe Joint Quantum Information Institute\, NIST Gaithersburg and The University \nof Maryland in College Park\, Maryland\, USA\nAbstract: We demonstrate e xperimentally that light polarization can be directly\ntransformed into the spin of resonantly excited correlated electron hole pairs\n('bright' and ' dark' excitons) in semiconductor quantum dots. We show how a\npolarized pic osecond pulse “writes” the exciton’s spin polarization and how a\nsecond pu lse “reads” it. We also demonstrate manipulation of the spin state\nfrom an y given point on the surface of its Bloch sphere\, to any desired point\, u sing\na third\, single intermediate pulse. LAST-MODIFIED:20230127T204953Z LOCATION:JQI-Seminar SEQUENCE:2 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120206T164500Z DTEND:20120206T173000Z DTSTAMP:20260828T094430Z UID:hm7endnhpfddio0l652cabj8rc@google.com CREATED:20120126T205049Z LAST-MODIFIED:20230127T204948Z LOCATION:Physics Toll Room "1305F" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090311T193000Z DTEND:20090311T203000Z DTSTAMP:20260828T094430Z UID:3qq470jbtpil79r5cerrqi18jk@google.com CREATED:20090227T153245Z DESCRIPTION:Title: ATF Explosives Analysis\nSpeaker: Dr. Peter Dreifuss\, A TF LAST-MODIFIED:20230127T204949Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130418T193000Z DTEND:20130418T203000Z DTSTAMP:20260828T094430Z UID:pba0dslcah3dm253ti6sndf298@google.com CREATED:20130206T183654Z DESCRIPTION:Title: "Generating solutions to Einsteins Equations from the Ya ng-Mills Action"\nSpeaker: Ira Rothstein\nInstitution: Carnegie Mellon Univ ersity\nAbstract: In this talk I will show how to generate solutions to Ein steins equations\nwithout any reference to the Einstein-Hilbert action star ting from the Yang Mills action by utilizing on-shell unitarity technique s in conjunction with BCFW (Britto\, Cachazo\, Feng\, Witten) recursion rel ations. LAST-MODIFIED:20230127T203931Z LOCATION:4102 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT & GRT Joint seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130415T154500Z DTEND:20130415T163000Z DTSTAMP:20260828T094430Z UID:n4eqr2mtvue8a3j1plc4cc5890@google.com CREATED:20130116T182257Z LAST-MODIFIED:20230127T204306Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091027T171500Z DTEND:20091027T183000Z DTSTAMP:20260828T094430Z UID:i24fir1knkr0l5avbo7pmqq7dc@google.com CREATED:20091019T133039Z DESCRIPTION:Title : Thermalization Near Integrability in the 1D Bose-Hubbar d Model\nSpeaker Name: Amy Cassidy\nSpeaker Institution : NIST\nNotes: As i n the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH t o which all are welcome\, departing from Room 1108 about five minutes after 12:00 (Noon) LAST-MODIFIED:20230127T204728Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110509T160000Z DTEND:20110509T163000Z DTSTAMP:20260828T094430Z UID:nqcdefp48q0bm707enkohai56o@google.com CREATED:20110414T190221Z LAST-MODIFIED:20230127T204806Z LOCATION:Physics 1305 F "New Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI LUNCHEON TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120814T170000Z DTEND:20120814T180000Z DTSTAMP:20260828T094430Z UID:hhgfdo6uchngljvtdv19rfktmg@google.com CLASS:PUBLIC CREATED:20120810T202922Z DESCRIPTION:Speaker: Junpu Wang\nInstitution: Columbia University\nTitle: S olid Inflation\nAbstract:\nWe develop a cosmological model where primordial inflation is driven by a `solid'\, defined as a system of three derivative ly coupled scalar fields obeying certain symmetries and spontaneously break ing a certain subgroup of these. The symmetry breaking pattern differs dras tically from that of standard inflationary models: time translations are un broken. This prevents our model from fitting into the standard effective fi eld theory description of adiabatic modes. Our model also naturally predict s a large non-gaussianity at 3-pt level.\n LAST-MODIFIED:20230127T204403Z LOCATION:4102 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131010T180000Z DTEND:20131010T193000Z DTSTAMP:20260828T094430Z UID:ijo2cvo4id41bh8th7a1j3t8ig@google.com CREATED:20130918T130749Z DESCRIPTION:Speaker: Roald Sagdeev\, University of Maryland\n\nTitle: Ano malous effects at transition layer to negative refraction index in metamate rials\n\nAbstract: The concurrent progress in plasmonics\, singular optics and metamaterials research has given rise to a class of phenomena exhibiti ng enhanced interaction EM waves with plasmons. As an example a strong ano malous electromagnetic enhancement occurs in metamaterials in a transition layer where refraction index goes through zero. The emergence of anomalous waves conversion and related nonlinear effects reveals useful parallels wit h similar effects in traditional plasma physics phenomena. LAST-MODIFIED:20230127T204928Z LOCATION:Phys room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090128T180000Z DTEND:20090128T200000Z DTSTAMP:20260828T094430Z UID:nvnt5r9nocoj10bpe0fp3dhbdc@google.com CREATED:20090126T131228Z DESCRIPTION:Speaker: Michael Birse\, University of Machester\nTitle: Decons tructing Nucleon-Nucleon Scattering LAST-MODIFIED:20230127T204942Z LOCATION:PHYS 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics (ENP/TQHN) Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121024T183000Z DTEND:20121024T193000Z DTSTAMP:20260828T094430Z UID:gr9ac5kmatp94fntuap6cp43ec@google.com CREATED:20120913T171407Z DESCRIPTION:SPEAKER: Jacobus Verbaarschot - Stony Brook University\nTITLE: QCD at Finite Density and the Sign Problem\nABSTRACT: We discuss the sign p roblem in QCD at nonzero chemical potential and analyze its severity within the framework of chiral perturbation theory. We obtain results for the dis tribution of the phase of the fermion determinant\, the distribution of th e baryon number as well as the distribution of the fermion determinant. Sta ndard reweighting methods are shown to have a severe overlap problem that m ay be evaded by methods relying on complexified gauge fields. Relations be tween the sign problem and Dirac spectra are discussed. LAST-MODIFIED:20230127T203946Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101214T123000 DTEND;TZID=America/New_York:20101214T133000 DTSTAMP:20260828T094430Z UID:3ffrvsou5tupgrjilaef9f7rvk@google.com RECURRENCE-ID;TZID=America/New_York:20101207T123000 CREATED:00010101T000000Z DESCRIPTION:[Topic] Eternal inflation and its implications\n[Paper Referenc e] Guth\, hep-th/0702178\, Hartle\, Hawking\, and HertogarXiv:1001.0262v1 [ hep-th]\,& arXiv:1009.2525v1 [hep-th]\n[Presenter] Ted Jacobson LAST-MODIFIED:20230127T204200Z LOCATION:4102 Physics Building SEQUENCE:4 STATUS:CONFIRMED SUMMARY:NPAC Lunch TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20121112T133000 DTEND;TZID=America/New_York:20121112T150000 DTSTAMP:20260828T094430Z UID:p5led18u6o5s6crj31ibe9kat8@google.com RECURRENCE-ID;TZID=America/New_York:20121112T133000 CREATED:20120921T203221Z DESCRIPTION:Title: "Ringdown amplitudes in extreme mass ratio inspiral"\nSp eaker: Shahar Hadar\nInstitution: Racah Institute\nAbstract: An extreme mas s ratio inspiral terminates when the small compact object plunges into the large black hole (BH) it orbited. Its trajectory\, hence also the emitted g ravitational waveform\, starts (quite) universally from the innermost stabl e circular orbit. Next\, the binary merges and the final black hole rings d own until it reaches steady state. In this stage the geometry constitutes a n open resonant cavity for gravitational perturbations\, which are describe d by quasinormal modes (QNMs). For a plunge into non-rotating BHs\, I prese nt (semi-) analytical results for the QNM ringdown amplitudes and hence the late time waveform\, and successfully compare to amplitudes extracted from numerical waveforms. For near-extremal Kerr BHs\, I present analytical res ults for the amplitudes\, excited in the highly symmetric near-horizon regi on. I show part of the computation can be carried out at exact extremality and carried to near-extremality by diffeomorphism. LAST-MODIFIED:20230127T205150Z LOCATION:4102 Physics Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Group Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110131T160000Z DTEND:20110131T170000Z DTSTAMP:20260828T094430Z UID:v07gg8344kna5rldjiaujtu244@google.com CREATED:20110119T140138Z DESCRIPTION:Title: Employing Genetically Modifiable Biological Supramacromo lecules to Develop NanoBiotechnology and NanoMedicine\nSpeaker: Chuanbin Ma o\nDepartment of Chemistry & Biochemistry\nUniversity of Oklahoma LAST-MODIFIED:20230127T204312Z LOCATION:Room 1105 Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bioengineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100920T150000 DTEND;TZID=America/New_York:20100920T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20100920T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] "Hylogenesis: a Unified Origin for Visible and Dark Mat ter" \n[Speaker] Hooman Davoudiasl\n[Institution] Brookhaven National Labor atory\n[Abstract] We present a novel mechanism for generating both the bary on and dark matter densities of the Universe. A new Dirac fermion X carryi ng a \nconserved baryon number charge couples to the Standard Model quarks as \nwell as a GeV-scale hidden sector. CP-violating decays of X\, produced \nnon-thermally in low-temperature reheating\, sequester antibaryon number in \nthe hidden sector\, thereby leaving a baryon excess in the visible se ctor. \nThe antibaryonic hidden states are stable dark matter. A spectacula r \nsignature of this mechanism is the baryon-destroying inelastic scatteri ng \nof dark matter that can annihilate baryons at appreciable rates releva nt \nfor nucleon decay searches.\n\n LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120321T150000Z DTEND:20120321T163000Z DTSTAMP:20260828T094430Z UID:1p8g0jpgujdli8ptdfb89mi164@google.com CREATED:20120306T194740Z DESCRIPTION:Title : The search for elusive Majorana particles in semiconduc tor-superconductor structures\nSpeaker Name: Roman Lutchyn\nSpeaker Institu tion : Microsoft Q\nNotes: Flier available at:\nhttp://www.physics.umd.edu/ cmtc/seminars.html\nAbstract :The exploration of topological phases of matt er is one of the main challenges in condensed matter physics. Among the exc iting recent developments in this direction are the discoveries of the new phases of matter with many intriguing properties such as topological insula tors and superconductors. In my talk\, I will focus on topological supercon ductors and discuss how to realize spinless p-wave superconductivity in sem iconductor/superconductor heterostructures. I will show that such a non-tri vial topological state emerging at the interface supports zero-energy modes that can be occupied by Majorana fermions. These quasi-particles\, which a re exotic in the sense that they are at the same time their own antiparticl es\, are effectively fractionalized objects (anyons) obeying non-Abelian st atistics. Despite being first predicted by E. Majorana in 1930s\, there is still no conclusive evidence of their existence. If found\, Majorana fermio ns would constitute a key building block for the implementation of fault-to lerant topological quantum computation schemes that are inherently decohere nce-free. I will conclude by proposing several experiments for detecting Ma jorana fermions in semiconductor nanowires. LAST-MODIFIED:20230127T205154Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JOINT CMTC/JQI SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121029T203000Z DTEND:20121029T213000Z DTSTAMP:20260828T094430Z UID:dj5rscg9riatg56ntfth51nkhg@google.com CREATED:20121018T180510Z DESCRIPTION:Title : Cassini Observations of Titan Ionospheric Outflow\n\nSp eaker Name: Joseph Westlake\n\nSpeaker Institution : Johns Hopkins Universi ty Applied Physics Laboratory\n\nAbstract: We report on Cassini Ion and Neu tral Mass Spectrometer (INMS) observations above Titan's exobase at altitud es of 2225 km to 3034 km. During the January 2008 T40 Cassini flyby of Tita n the Ion and Neutral Mass Spectrometer (INMS) serendipitously observed non thermal\, exospheric ions. This is the first mass-resolved observation of T itan¹s exospheric ions. We observe significant densities of CH5+\, HCNH+ an d C2H5+ that require ion-molecule reactions to be produced in the quantitie s observed. During the observation the Cassini spacecraft was executing a r oll causing the INMS to observe several locations in velocity space. Ions a re observed with velocities of about 1 km/s. The measured composition and i on velocity suggest that the observed ions must have been created deep insi de Titan's ionosphere (below the exobase) and then transported to the detec tion altitude. Plasma motion from below Titan's exobase to large distances can be driven by a combination of thermal pressure and magn\netic forces. T he observed outward flows may link the main ionosphere with the more distan t wake and provide a source of hydrocarbon ions in the Saturnian system. LAST-MODIFIED:20230127T205226Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211207T180000Z DTEND:20211207T190000Z DTSTAMP:20260828T094430Z UID:65et30f4dqjktdttb6oll4lkkh@google.com CREATED:20210913T184555Z LAST-MODIFIED:20230127T204107Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120904T200000Z DTEND:20120904T210000Z DTSTAMP:20260828T094430Z UID:30ecnemdune52gchl8v1cbg2a8@google.com CREATED:20120822T152119Z DESCRIPTION:Speaker: Michelle Girvan\nInstitution: University of Maryland\n Title: Understanding Genomic Networks through Statistical Physics and Nonli near Dynamics\nAbstract: Many natural\, technological\, and social systems take the form of networks. Examples include metabolic networks\, the Intern et\, and friendship networks. In the last decade or so\, the new field of “network science” has emerged\, with physicists playing a key role applying methods from statistical mechanics and nonlinear dynamics to understand th e behavior of these complex networks. In this talk\, I will discuss two re search projects that leverage a networks perspective in order to gain insig hts into biological systems. The first project focuses on how network met hods can help us better interpret the vast quantities of raw data that must be integrated for whole-genome sequencing. Our work utilizes insights fro m the observation that a key element of the genome assembly problem is simi lar to that of finding the ground state of a spin glass\, but with a previo usly unconsidered connection topology for which a network perspective is ap plicable. The second project explores how the dynamics of genetic control in living organisms depends upon the elaborate network of interactions betw een genes. Our work shows how connecting these systems to well studied mode ls in statistical physics can help elucidate the role of network structure in gene regulation. LAST-MODIFIED:20230127T205306Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100920T163000Z DTEND:20100920T173000Z DTSTAMP:20260828T094430Z UID:30jl6ai2fcrjcpskoaa1qnshdg@google.com CREATED:20100825T185211Z DESCRIPTION:Title: Orbital superfluidity in a 2D optical lattice\nSpeaker: Andreas Hemmerich\, University of Hamburg\nAbstract: I discuss our recent o bservations of orbital superfluidity in higher bands of a 2D bipartite opti cal lattice. Via analysis of the momentum spectra we observe truly complex- valued order parameters\, which break time-reversal symmetry. LAST-MODIFIED:20230127T204901Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110906T160000 DTEND;TZID=America/New_York:20110906T170000 RRULE:FREQ=WEEKLY;UNTIL=20110920T035959Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:7mv79sbs7v4a9r4hk319iecqns@google.com CREATED:20110826T135502Z DESCRIPTION:Title: How Smart Can You Get? Computational Efficiency in Neura l Circuits \n\nAbstract: The human brain weighs about 1.5 kilograms\, and is made up of 100 billion neurons intricately connected via a network so de nse that every cubic millimeter of the brain contains 4 kilometers of wire. The electrical activity of this incredibly complex network of neurons ma kes up human thought\, and allows us to move\, perceive\, talk\, plan\, lov e\, and do physics\, all with a subtlety and precision that escapes the mos t powerful computers. And to do all this the brain uses only as much powe r as a refrigerator light bulb! We will start by discussing what neurons are and how neurons are organized into circuits in the brain. Then we will consider how we think and make decisions using the collective electrical a ctivity of large numbers of neurons. Third\, we will discuss the organizat ional strategies employed by neural circuits to efficiently organize the us e of power\, space and other resources. Using the example of the circui ts in the retina\, we will argue that efficiency of computation can give a "theory of design" explaining key aspects of the observed architecture. F inally we will explore limits to these computational strategies -- i.e. wh ether we could all get smarter by evolving to have bigger brains (more neur ons)\, using more energy (more active neurons)\, having more cleverly organ ized circuits\, or even attaching plug-in external modules that could help the brain to do difficult things like multiplication. LAST-MODIFIED:20230127T205012Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131003T203000Z DTEND:20131003T213000Z DTSTAMP:20260828T094430Z UID:bhlbl3bcm9vp50dgjo0td9n20k@google.com CREATED:20130918T145450Z DESCRIPTION:Title : Spontaneously Emitted Fluctuations in Unmagnetized Plas mas\n\nSpeaker Name: Tim Felten\n\nSpeaker Institution : Ruhr-Universität B ochum\n\nAbstract : We will derive the general expressions for the electrom agnetic fluctuation spectra in unmagnetized plasmas using fully relativisti c dispersion functions and form factors for the important class of isotropi c plasma particle distribution functions. The special case of aperiodic flu ctuations will be analyzed for an electron-proton plasma with a Maxwellian and a Lorentzian distribution function.\nThe fluctuation intensities are do minated by the contribution from a new collective\, damped mode. We will de termine the magnetic field strengths from this mechanism.\n LAST-MODIFIED:20230127T205117Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091103T160000 DTEND;TZID=America/New_York:20091103T170000 DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com RECURRENCE-ID;TZID=America/New_York:20091103T160000 CREATED:20090819T165808Z DESCRIPTION:Speaker: Prof. Alessandra Buonanno\, University of Maryland:\n \nTitle: "Modeling the Dynamics and Gravitational-Wave Emission of Coalesci ng \nBinary Black Holes". LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101209T173000Z DTEND:20101209T183000Z DTSTAMP:20260828T094430Z UID:j68hungv4lsj4j08f5rcor0k6g@google.com CREATED:20101203T135038Z DESCRIPTION:Title:Uncovering Ancient Networks from Present-day Interactions \nSpeaker: Prof. Carl Kingsford\nUniversity of Maryland\nDept. of Computer Science\nUniversity of Maryland Institute for Advanced Computer Studies\nCe nter for Bioinformatics and Computational Biology LAST-MODIFIED:20230127T204642Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20100830T150000 DTEND;TZID=America/New_York:20100830T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20100830T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] "Spin determination from Kinematic \nReconstruction at the LHC"\n[Speaker] Hsin-Chia Cheng\n[Institution] University of Californi a\, Davis \n LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111109T210000Z DTEND:20111109T223000Z DTSTAMP:20260828T094430Z UID:2i7bfn6ro5usq2e77u1nj9r9o8@google.com CREATED:20111104T151712Z DESCRIPTION:Title : "The Future of the Fermi Gamma-Ray Space Telescope"\nSp eaker Name: Dr. Julie McEnery\nSpeaker Institution : NASA Goddard\n LAST-MODIFIED:20230127T204531Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20111028T130000 DTEND;TZID=America/New_York:20111028T140000 DTSTAMP:20260828T094430Z UID:0g0fishv5cglmrqdqbhasef4lo@google.com RECURRENCE-ID;TZID=America/New_York:20111028T093000 CREATED:20110912T203059Z DESCRIPTION:Title : Issues Arising from Lead-free Materials on Electronics Assemblies\nSpeaker Name: Michael Osterman\nSpeaker Institution : Center fo r Advanced Life Cycle Engineering (CALCE)\, Department of Mechanical Engine ering\, UMCP\nAbstract : Concerns over human health and environmental impac t have resulted in several countries restricting or banning select material s from use in the construction of electronic products and systems. Restrict ed materials include lead\, mercury\, hexavalent chromium\, cadmium\, polyb rominated biphenyl (PBB) and polybrominated diphenylethers (PBDE)\, with ot hers being proposed. While electronics used for defense systems have been e xcluded from these government regulations\, the globalization and commercia lization of electronics make the exclusion relatively miniscule. Of the res tricted materials\, the removal of lead has resulted in perhaps the most dr amatic change.\nWhile electronic equipment manufacturers can still obtain e utectic tin lead solder\, the availability of parts with tin-lead terminal finishes is diminishing and cost and lead times to obtain parts with tin-le ad finished parts is rising. As such\, equipment manufacturers must determi ne the impact on product reliability due to converting completely to lead f ree materials\, determine the impact on product reliability by using parts with lead-free terminal finishes in tin-lead soldered assemblies\, and/or d etermine the reliability risk of converting lead-free terminals to tin-lead finished terminals. Issues and risks are present independent of selected d irection taken by the equipment manufacturer. With regards to using lead-fr ee materials\, manufacturer must consider the risk of failure due to tin wh iskers. Assembling ball grid array parts with lead-free solder sphere in a tin lead reflow assembly process can lead to compromised solder joint relia bility. Assemblies constructed with the currently popular lead-free solder tend to have a lower shock/drop interconnect durability. Higher processing temperature associated with using lead-free solder can give rise to manufac turing and reliability issues. Current methods for assessing the results of tests used to qualify electronic equipment must be revised based on the ph ysical understanding of the behavior of the new lead-free material set.\n LAST-MODIFIED:20230127T204348Z LOCATION:Location: Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY: Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091123T213000Z DTEND:20091123T223000Z DTSTAMP:20260828T094430Z UID:i5031gretq61fg1srgs6h9qpfo@google.com CREATED:20091110T133336Z DESCRIPTION:Title : Connecting the Sun to the Earth Through Solar Irradianc e\nSpeaker Name: Phillip C. Chamberlin\nSpeaker Institution : NASA Goddard Space Flight Center\nAbstract : The solar photon output\, which was once th ought to be constant\, varies over all time scales from seconds during sola r flares to years due to the solar cycle\, and even longer-term variations throughout the life of the Sun. These solar variations cause significant de viations in the Earth and space environments on similar time scales\, such as affecting the atmospheric densities and composition of particular atoms\ , molecules\, and ions in the atmospheres of the Earth and other planets. T hese changes then affect many things including satellite drag\, radio commu nications\, and the accuracy of the Global Positioning System (GPS). Presen ted and discussed will be examples of the accurate\, space-based measuremen ts of the integrated photon output of the Sun\, referred to as the solar ir radiance\, with the main focus on the X-ray and ultraviolet wavelength regi ons of the spectrum as well as the total solar irradiance (TSI). Connection s will then be made to show how changes in the!\n\n solar ultraviolet irrad iance on the minutes to years time scales drive changes in the Earth\, Moon \, and Mars and lead to challenges in a society that is becoming more and m ore dependent on technologically.\n LAST-MODIFIED:20230127T204929Z LOCATION:CSS 23400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131114T183000Z DTEND:20131114T190000Z DTSTAMP:20260828T094430Z UID:nq4en2c699f4s4ki3prpva9qm8@google.com CREATED:20131024T155425Z LAST-MODIFIED:20230127T205015Z LOCATION:Physics room 1305F\, the "new" Toll room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111213T190000Z DTEND:20111213T203000Z DTSTAMP:20260828T094430Z UID:7qpl0ghnnd6vh3r48s5e7cqfoc@google.com CREATED:20110916T150832Z DESCRIPTION:Title: "The Status of SUSY after 1/fb"\nSpeaker: Patrick Meade\ nInstitution: Stony Brook University\nAbstract: "In this talk I will review the status of supersymmetry based on the results of recent searches by the ATLAS and CMS collaborations. I will focus on simplified models that can be embedded in the General Gauge Mediation framework\, and discuss how this can be used as a tool to search for any viable model of SUSY breaking medi ation. I will comment on what regions of parameters space are least constr ained\, and what are some promising directions for future searches."\n\n*pr eceded by lunch at 12:30 pm in 1305F (Toll room) in Physics Bldg LAST-MODIFIED:20230127T204807Z LOCATION:1201 Physics Bldg. SEQUENCE:2 STATUS:CONFIRMED SUMMARY:EPT Seminar Joint with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130910T171500Z DTEND:20130910T181500Z DTSTAMP:20260828T094430Z UID:ef9vhpa72s1gjejocn9oqch1k0@google.com CREATED:20130910T132756Z DESCRIPTION:Speaker: Professor Kayo Ide\, UMCP\nTitle: Data Assimilation: How Statistics Improves Dynamic Forecast LAST-MODIFIED:20230127T204638Z LOCATION:1116\, IPST Building 085 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100503T163000Z DTEND:20100503T173000Z DTSTAMP:20260828T094430Z UID:m020l3bn09u0a0nn1n08vdu4b4@google.com CREATED:20100428T194739Z DESCRIPTION:Title : Quantum Information Processing with Atomic Qubits and O ptical Frequency Combs\nSpeaker Name: Wesley Campbell\nSpeaker Institution : JQI and University of Maryland Department of Physics\nAbstract : Pulsed o ptical fields from mode-locked lasers have found widespread use as tools fo r precision quantum control and are well suited for implementation in quant um information processing and quantum simulation. We experimentally demonst rate two distinct regimes of the interaction between hyperfine atomic ion q ubits and stimulated Raman transitions driven by picosecond pulses from a f ar off-resonance mode-locked laser. In the weak pulse regime\, the coherent accumulation of successive pulses from an optical frequency comb performs single qubit operations and is used to entangle two trapped atomic ion qubi ts. In the strong pulse regime\, a single pulse is used to implement a fast (<10 ps) Hadamard gate and we show how a few pulses may be used to address the atom's motion by imparting state-dependent momentum kicks. To entangle multiple ions\, optical frequency combs operated near the strong pulse reg ime may be used to implement motion-mediated gates that can be performed mu ch faster than a collective motional period. LAST-MODIFIED:20230127T205108Z LOCATION:PHYS 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080915T163000Z DTEND:20080915T173000Z DTSTAMP:20260828T094430Z UID:35im0ei7biurevdhbc6vi3n0bg@google.com CREATED:20080912T154237Z DESCRIPTION:Speaker:Dan Stamper-Kurn\, University of California at Berkeley \nTitle:"TBA"\n LAST-MODIFIED:20230127T205039Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130131T190000Z DTEND:20130131T203000Z DTSTAMP:20260828T094430Z UID:dnsius6a63on7gnbv1cvjhreig@google.com CREATED:20130130T205509Z DESCRIPTION:Speaker: Vladimir Manucharyan\, Harvard University\n \nTitle: Proximity-induced superconductivity in a few-electron system\n \nAbstract: We present tunneling spectroscopy of individual quasiparticle bound state s in an Al/InAs/Al mesoscopic Josephson junction. The device is a broken su perconducting Al loop bridged by a short section of a crystalline semicondu cting InAs nanowire. The loop is pierced with a magnetic flux to control th e superconducting phase difference across the junction\; the electron densi ty in the nanowire can be gate-tuned down to full depletion\; spectroscopy is performed using a separate normal metal lead.\n\nAt large electron densi ty in the nanowire\, the spectrum shows a phase-tunable minigap\, character istic of the proximity effect in diffusive conductors. Reducing the density \, we resolve a discrete sub-gap resonance corresponding to the Andreev bou nd state for a quasiparticle in the junction region. We argue that the corr esponding BCS-like ground state of the nanowire consists of only a single C ooper pair\, which "leaked" from the leads. At densities closer to depletio n\, Coulomb interaction switches on and turns the junction (at an odd occup ancy) into a spin 1/2 quantum impurity. The sub-gap resonance then has a qu alitatively different gate- and phase- dependence and can be explained by t he formation of a Kondo-like singlet between a quasiparticle in Al and the impurity. Our experiments reveal how superconductivity can be proximity-ind uced in systems containing only a few electronic states\, and may find appl ications in quantum information processing with individual Bogolyubov quasi particles and in proximity-engineering of topological superconductivity.\n LAST-MODIFIED:20230127T203927Z LOCATION:Physics rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium w/ VLADIMIR MANUCHARYAN\, Harvard Unive rsity TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20120919T140000 DTEND;TZID=America/New_York:20120919T150000 DTSTAMP:20260828T094430Z UID:udppuq2tn54g1jm2l48193kf50@google.com RECURRENCE-ID;TZID=America/New_York:20120919T110000 CREATED:20120912T144127Z DESCRIPTION:Title : Cyclotron masers and gyrotrons\n\nSpeaker Name: Dr. Gre gory Nusinovich\n\nSpeaker Institution : IREAP\, University of Maryland\n\n Abstract : This presentation is a plenary lecture which will be delivered b y the speaker at the International Conference on Infrared\, Millimeter\, an d Terahertz Waves in Wollongong (Australia) on September 26\, 2012 where th e speaker will be awarded by the Kenneth Button Prize for his contribution to the theory and development of gyrotron oscillators and amplifiers with f requencies up to the terahertz range. The lecture will consist of a histor ical overviews\, discussion of the progress in the gyrotron development and consideration of some physics issues in the theory of cyclotron masers. LAST-MODIFIED:20230127T204125Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090211T180000Z DTEND:20090211T200000Z DTSTAMP:20260828T094430Z UID:ould8u52kspunj991a0a5e1ck0@google.com CREATED:20090210T212434Z DESCRIPTION:Title: The B -> pi 1 nu Form Factor and |Vub| from Three Flavor Lattice QCD\nSpeaker: Ruth Van de Water\, Brookhaven National Lab\, Upton NY LAST-MODIFIED:20230127T204843Z LOCATION:Physics Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100415T161500Z DTEND:20100415T171500Z DTSTAMP:20260828T094430Z UID:0b3irtdjjqv1u0flfc09et8fgg@google.com CREATED:20100222T160700Z DESCRIPTION:Title : Improving Epidemic Intervention Using Social Contact Ne twork Structure\nSpeaker Name: Tom DuBois\nSpeaker Institution : Computer S cience\, University of Maryland\n LAST-MODIFIED:20230127T204253Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131210T193000Z DTEND:20131210T210000Z DTSTAMP:20260828T094430Z UID:egbsco2t01r6kh2mnt2l1se4vc@google.com CREATED:20131112T230937Z DESCRIPTION:UPDATE: This talk is still scheduled to take place today at 2: 30pm.\n\nSpeaker: Matthew P.A. Fisher (Physics Department and KITP\, UCSB) \n\nTitle: Quantum Disentangled Liquids\n\nAbstract: We propose and explor e a new finite temperature phase of translationally invariant multicomponen t liquids which we call a “Quantum Disentangled Liquid” (QDL) phase. We con template the possibility that in fluids consisting of two (or more) species of indistinguishable quantum particles with a large mass ratio\, the light particles might “localize” on the heavy particles. We give a precise\, for mal definition of this Quantum Disentangled Liquid phase in terms of the fi nite energy density many-particle wavefunctions\, involving partial measure ments. If the positions of all the heavy particles are measured\, the proje cted wavefunction for the unmeasured light particles has as an area law ent anglement entropy\, while measuring the light particle positions projects o nto a heavy particle wavefunction with a volume law entanglement entropy. A heavy/light particle QDL phase can be generalized to include other partial measurements\, such as measuring the spin or the charge in a Fermion Hubba rd-type model. In a spin/charge QDL phase\, measuring the spin in a finite energy density eigenstate would project on to a charge wavefunction with an area law entanglement entropy\, while a charge measurement would project o n to a volume law entangled spin wavefunction. Possible physical systems th at might manifest a QDL phase will be briefly discussed.\n\nHost: Kostyant yn Kechedzhi\n\nhttp://www.physics.umd.edu/cmtc/seminars.html\n LAST-MODIFIED:20230127T204056Z LOCATION:PHYS 2205 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Update--CMTC Seminar (see below) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120430T154500Z DTEND:20120430T163000Z DTSTAMP:20260828T094430Z UID:thii8t0ocqr816jpf9mbf2tsb0@google.com CREATED:20120418T141441Z LAST-MODIFIED:20230127T204804Z LOCATION:Physics 1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120501T183000Z DTEND:20120501T193000Z DTSTAMP:20260828T094430Z UID:odr8v2hf41ijtrp4lk0p6c7pqk@google.com CREATED:20120427T173215Z DESCRIPTION:Title : Probing the Domain Dynamics During Ferroelectric Switch ing\nSpeaker Name: Xiaoqing Pan\nSpeaker Institution : Department of Materi als Science and Engineering\, University of Michigan\nAbstract : Ferroelect ric materials are characterized by a spontaneous electric polarization that can be reoriented between different orientations by an applied electric fi eld. The ability to form and manipulate domains with different polarization orientations at the nanometer scale is key to the utility of ferroelectric materials for devices such as nonvolatile memories. The ferroelectric swit ching occurs through the nucleation and growth of favorably oriented domain s and is strongly mediated by defects and interfaces. Thus\, it is critical to understand how the ferroelectric domain forms\, grows\, and interacts w ith defects. In this talk I will present the nanoscale ferroelectric switch ing of BiFeO3 and PbZr0.2Ti0.8O3 thin films under an applied electric field using in situ transmission electron microscopy with atomic resolution. We follow the kinetics and dynamics of ferroelectric switching at millisecond temporal and subangstrom spatial resolution. We observed localized nucle\na tion events at the electrode interface\, domain wall pinning on point defec ts\, the formation of ferroelectric domains localized to the ferroelectric/ electrode interface\, and domain wall pinning by dislocations. We also find that in writing nanosized domains the domain wall itself can drive backswi tching. It was observed that the localized 180° polarization switching in P bZr0.2Ti0.8O3 thin films initially forms domain walls along unstable planes . After removal of the external field\, they tend to relax to low energy or ientations. In sufficiently small domains this process results in complete backswitching. Our results suggest that even thermodynamically favored doma in orientations are still subject to retention loss\, which must be mitigat ed by overcoming a critical domain size. LAST-MODIFIED:20230127T205259Z LOCATION:1105 Jeong H. Kim Engineering Bldg. (Pepco Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100222T200000Z DTEND:20100222T210000Z DTSTAMP:20260828T094430Z UID:fd3gc8sm22e5msv38e1mal7v9g@google.com CREATED:20100217T200053Z DESCRIPTION:[Speaker] Joachim Kopp\n[Institution] Fermilab\n[Title] Global interpretation of direct Dark Matter searches\n[Abstract] We perform a glob al analysis of the existing data on direct Dark Matter (DM) detection\, and investigate in particular the compatibility of the DAMA claim with exclusi on limits from other experiments. We find that spin-independent or spin-dep endent elastic scattering cannot explain DAMA\, and that also the inelastic \, spin-independent (iSI) DM scenario is disfavored. In particular\, we arg ue that a successful fit (including DAMA) of iSI DM would require fine-tuni ng between particle physics and astrophysics parameters. Spin-dependent\, i nelastic scattering\, on the other hand\, is a viable possibility. In the s econd part of the talk\, we investigate the rich phenomenology of leptophil ic DM in direct detetcion experiments and in the Sun. We argue that leptoph ilic DM cannot explain DAMA because\, depending on the details of the model \, either the observed annual modulation spectrum cannot be fitted\, or loo p-level DM-nucleus scattering leads to strong limits from experiments like CDMS or XENON.\n\n LAST-MODIFIED:20230127T204600Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090126T173000Z DTEND:20090126T183000Z DTSTAMP:20260828T094430Z UID:rdrbmhk1s61ukssnqqjm5nm2v8@google.com CREATED:20090126T135251Z DESCRIPTION:Speaker: Kathy Levin\, University of Chicago\nTitle: "Relating Cold Atoms to High-Tc Superconductivity" LAST-MODIFIED:20230127T204533Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110202T163000Z DTEND:20110202T180000Z DTSTAMP:20260828T094430Z UID:pp2vpdsclukc61e5lph2q7drq8@google.com CREATED:20110124T130921Z DESCRIPTION:SPEAKER: Jonathan Walsh – Lawrence Berkeley Natl Lab \n \nTI TLE: Using SCET for Jet Physics at Colliders\n\nABSTRACT: I will give an overview of soft-collinear effective theory (SCET) and its applications to collider physics. The focus of the talk will be jet physics\, and how SCE T is a natural language to describe jets. I will present problems in jet p hysics that the effective theory can illuminate. Finally\, I will discuss a simple application of power counting in SCET to understand the behavior o f jet algorithms and jet substructure.\n\n LAST-MODIFIED:20230127T205227Z LOCATION:Physics Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121017T210000Z DTEND:20121017T220000Z DTSTAMP:20260828T094430Z UID:jdbrm8c1gjitat6tjc8kujgfjg@google.com CREATED:20121002T150334Z DESCRIPTION:Ever thought about installing solar panels on your roof\, and r educing both your carbon footprint and your electricity bills? Want to lea rn the latest developments in photovoltaic technology and policy?\n \nAlong these lines\, the Washington DC\, Northern VA Chapter of the IEEE Photonic s Society is sponsoring a plenary session at the University of Maryland wit h the theme of:\n“Everything you wanted to know about solar energy\, but we re afraid to ask.” Or more specifically\, “Forefront Developments in the T echnology\, Policy\, and Economics of Solar Power”.\n \nWhen: Wed.\, Octobe r 17th\, 2012\nTime: 4:30 pm - Refreshments and hors d'oeuvres\n5:00 pm – 6:30 pm - Seminars\n6:45 pm - Optional dinner with speakers at local restau rant [Looney’s Irish Pub]\nLocation: University of Maryland\, A. V. William s Building\, Room 1146\nIEEE POC: Bob Bartolo [bartolo@umd.edu]\nFor more i nformation about the seminar agenda\, please click on the link below:\nhttp ://ewh.ieee.org/r2/wash_nova/photonics/\n \nSeminar highlights:\n“Turning p -n junctions upside-down: Interdigitated Back Contacts for Thin Film Photov oltaic Devices”\nDr. Daniel Josell from NIST.\n“Solar Energy: Trends\, Busi ness Models and Growth Perspectives”\nBianca Barth from the Solar Electric Power Association (SEPA)\n \n“Everything you always wanted to know about in stalling solar\, but were afraid to ask”\nKatherine Arredondo from SolarCit y\nFor directions and campus map available via website\, see (scroll all th e way down and pay close attention to parking details):\nhttp://ewh.ieee.or g/r2/wash_nova/photonics/directions.html\nLook forward to seeing some of yo u on Oct. 17th. LAST-MODIFIED:20230127T204218Z LOCATION:University of Maryland\, A. V. Williams Building\, Room 1146 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plenary Session: Forefront Developments in the Technology\, Policy\ , and Economics of Solar Power TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121016T200000Z DTEND:20121016T210000Z DTSTAMP:20260828T094430Z UID:78693lm18k16boi0gh4g47l7e8@google.com CREATED:20120919T172419Z DESCRIPTION:Speaker: Andre Geim\, University of Manchester \nTitle: Random Walk to Graphene LAST-MODIFIED:20230127T204442Z LOCATION:PHYS 1412 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium/Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100615T150000Z DTEND:20100615T163000Z DTSTAMP:20260828T094430Z UID:qj52h40jbg5a6hqnv615dhlt8k@google.com CREATED:20100601T160747Z DESCRIPTION:Title : Aharonov-Bohm oscillations in disordered topological in sulator nanowires\nSpeaker Name: Jens Bardarson\nSpeaker Institution : Berk eley\nNotes: For more events see:\nhttp://www.physics.umd.edu/cmtc/seminars .html\nAbstract : A direct signature of electron transport at the metallic surface of a topological insulator is the Aharonov-Bohm oscillation observe d in a recent study of Bi_2Se_3 nanowires [Peng et al.\, Nat. Mat. 9\, 225 (2010)] where conductance was found to oscillate as a function of magnetic flux $\\phi$ through the wire\, with a period of one flux quantum $\\phi_0= h/e$ and maximum conductance at zero flux. This seemingly agrees neither wi th diffusive theory\, which would predict a period of half a flux quantum\, nor with ballistic theory\, which in the simplest form predicts a period o f $\\phi_0$ but a minimum at zero flux due to a nontrivial Berry phase in t opological insulators. In this talk I will show how h/e and h/2e flux oscil lations of the conductance depend on doping and disorder strength\, provide a possible explanation for the experiments\, and discuss further experimen ts that could verify the theory. Ref: arXiv:1005.3762.\n LAST-MODIFIED:20230127T205258Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091014T200000Z DTEND:20091014T210000Z DTSTAMP:20260828T094430Z UID:5c0qra37f798qvh4k2np8m6410@google.com CREATED:20090925T143542Z DESCRIPTION:Title : Three-dimensional equatorial spread F modeling\nSpeaker Name: Dr. Joe Huba\nSpeaker Institution : Naval Research Laboratory\nAbstr act : Equatorial spread F (ESF) is a post-sunset phenomenon in which the eq uatorial F-region ionosphere becomes unstable: large-scale (10's km) electr on density `bubbles' can develop and rise to high altitudes (> 1000 km at t imes). Associated with the large-scale electron density\nstructures are sma ller-scale irregularities that generate turbulence down to length scales as small as 10 cm. ESF is an important space\nweather concern because it sci ntillates radio signals that can degrade and disrupt communications and nav igation systems. The Naval Research Laboratory (NRL) has recently develope d a new three-dimensional code\nto study equatorial spread F (ESF). The co de is based on the comprehensive NRL 3D ionosphere model SAMI3 and includes a potential\nequation to self-consistently solve for the electric field. T he model assumes equipotential field lines so a 2D electrodynamic problem i s\nconsidered. In this study a narrow wedge of the post-sunset ionosphere is simulated. It is found that (1) bubbles can rise to\n~1600 km\, (2) ext remely steep ion density gradients can develop in both longitude and latitu de\, (3) upward plasma velocities approach 1 km/s\, and (4) the growth time of the instability is about 15 min. These results are shown to be consiste nt with radar and satellite\nobservations. LAST-MODIFIED:20230127T204651Z LOCATION:1207\, Energy Res. Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080924T193000Z DTEND:20080924T203000Z DTSTAMP:20260828T094430Z UID:o0ruv5t3ncjd9ts2luep16rn2s@google.com CREATED:20080912T164204Z DESCRIPTION:Speaker:Michael Shur\, Rensselaer Polytechnic Institute\nTitle: "Terahertz Sensing Technology"\n LAST-MODIFIED:20230127T204030Z LOCATION:LPS Building\, Room: Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100510T200000Z DTEND:20100510T210000Z DTSTAMP:20260828T094430Z UID:k6tkeeeql5latvugjh16tsm098@google.com CREATED:20100505T132249Z DESCRIPTION:Speaker: Dr. Gerhard Hummer\n National Institute s of Health\n\nTitle: Protein-Protein Binding: From Encounter \n Complexes to Multi-Protein Assemblies.\n LAST-MODIFIED:20230127T205036Z LOCATION:Room IPST 1116 Bldg 085 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100412T150000Z DTEND:20100412T160000Z DTSTAMP:20260828T094430Z UID:ubccofrvu86s7vodq8bp8dpdo4@google.com CREATED:20100405T133420Z DESCRIPTION:Title: Base-By-Base Ratcheting of Single Stranded DNA Through a Solid-State Nanopore\n\nPresented by Binqual Luan\nIBM Thomas J. Watson Re search Center\n\nAbstract: The benefits of low-cost\, high-throughput human genome sequencing to medical science has inspired recent experimental work focused on DNA translocation through solid-state nanopores. Given that mic roelectronic fabrication methods permit the integration of nano-electronics devices to sense each DNA base\, the genetic code (DNA sequence) could be read out during translocation by measurement of transverse electrical curre nt\, voltage signal\, ionic current or hydrogen-bond mediated tunneling sig nal generated by each base in turn. However\, DNA translocation inside a so lid nanopore remains poorly controlled and DNA moves too rapidly to be dete cted at the desired single-base resolution. Here I show using realistic ato mistic modeling that the recently proposed DNA transistor can achieve singl e-base control. These simulation results and a simple theoretical model ins pired by the numerical studies demonstrate that when pulled by an optical t weezer as in a single molecule experiment or driven by a biasing electric f ield as in a high-throughput screening mode\, the DNA transistor allows sin gle stranded DNA to transits a nanopore in a stick-slip or thermal ratchet- like fashion\, i.e. DNA alternatively stops and advances quickly one nucleo tide spacing. During a stick state\, a DNA base could be positioned before a sensor for an accurate read-out. Ideally\, the DNA transistor could be ut ilized in conjunction with a nanopore-based DNA sensing technology to achie ve the goal of fast and cheap DNA sequencing. LAST-MODIFIED:20230127T204323Z LOCATION:Room 1105\, Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Bioengineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101202T173000Z DTEND:20101202T183000Z DTSTAMP:20260828T094430Z UID:a0isnori2v9qunpa8pnh2utplo@google.com CREATED:20101129T142004Z DESCRIPTION:Title: Cell Shape Dynamics: From Waves to Migration\nSpeaker: Meghan Driscoll\, University of Maryland\, Dept. of Physics\nTitle: Interna l Dynamics of a Slow Granular Flow\nSpeaker: Steven Slotterback\, Universit y of Maryland\, Dept. of Physics LAST-MODIFIED:20230127T204837Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081006T200000Z DTEND:20081006T210000Z DTSTAMP:20260828T094430Z UID:sk5ves5m23l3vlc9qv448g3fkc@google.com CREATED:20080924T155310Z DESCRIPTION:Speaker: Kwaku Dayie\, Associate Professor\, Department of Che mistry and Biochemistry\, University of Maryland\nTitle: Consequence of Mot ion for RNA: From spin physics to catalytic function LAST-MODIFIED:20230127T204510Z LOCATION:IPST BUILDING\, ROOM 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110328T200000Z DTEND:20110328T210000Z DTSTAMP:20260828T094430Z UID:3rjlf5te214n1qjvpt5v31nvqs@google.com CREATED:20110317T133718Z DESCRIPTION:Speaker: Krystyn J. Van Vliet\, MIT \nTitle:"Chemomechanics o f cell-material interactions: Pulling it all together" LAST-MODIFIED:20230127T205143Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST/Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131017T163000Z DTEND:20131017T173000Z DTSTAMP:20260828T094430Z UID:fu6m8abjiqnp7dr2uh8n6j7ge8@google.com CREATED:20131007T153654Z DESCRIPTION:Title : Strong Control in Cavity QED\nSpeaker Name: Luis Orozco \nSpeaker Institution : UMD Physics\, JQI\nAbstract : Cavity QED in the opt ical regime has two avenues for dissipation: spontaneous emission of the at oms and escape of the light from the cavity. Strong control of the dynamics in the cavity QED relies on both channels and permits the preservation of a conditional quantum state a long time after the expected decay of the sys tem. This talk presents experiments with Rb atoms in a cavity QED system wh ere the single atom coupling and the decay rates are comparable. Single mod e and two mode monitoring offer feedback possibilities to preserve conditio nal atom-cavity oscillatory exchange and ground state superpositions.\n LAST-MODIFIED:20230127T205112Z LOCATION:IREAP\, Large Conference Room (ERF 1027) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090513T200000Z DTEND:20090513T213000Z DTSTAMP:20260828T094430Z UID:crrt7b61dp2vtnnd9004ha3dc0@google.com CREATED:20090508T175042Z DESCRIPTION:Title: Measurement of the W Production Charge Asymmetry at CDF\ nSpeaker: Dr. Eva Halkiadakis\, Rutgers University LAST-MODIFIED:20230127T204414Z LOCATION:Physics Building\, Room 4220 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy/Astrophysics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110919T160000Z DTEND:20110919T163000Z DTSTAMP:20260828T094430Z UID:68fadcr42v61i69nkl1oqrps3c@google.com CREATED:20110811T172929Z LAST-MODIFIED:20230127T204135Z LOCATION:1305F Physics "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130430T180000Z DTEND:20130430T190000Z DTSTAMP:20260828T094430Z UID:9960i83eacp7aqh4gvut5rr100@google.com CREATED:20130415T194124Z DESCRIPTION:Title : Impact of a CP Violating Higgs Boson and Electroweak Co genesis\n\nSpeaker Name: Yue Zhang\nSpeaker Institution : Caltech\n\nAbstra ct : I will talk about a generic connection between CP violating Higgs sign als and electroweak baryogenesis: the particle that contributes to CP viola ting $hgg$ or $h\\gamma\\gamma$ vertex would also provide a CP violating so urce during first order phase transition. I illustrate this point in a 2HDM where a common CP violating phase controls the lightest Higgs properties a t the LHC\, electric dipole moments and the CP violating source for electro weak baryogenesis. An order one CP violating phase can still survive all cu rrent constraints. On top of this framework\, I will discuss a model buildi ng for asymmetric dark matter based on Minimality. I will show in the minim al model that the dark matter mass must lie at the weak scale\, the asymmet ries are generated and transferred through the Higgs portals and no light m ediator is needed. LAST-MODIFIED:20230127T205051Z LOCATION:2202 Physics Bldg. SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110425T200000Z DTEND:20110425T213000Z DTSTAMP:20260828T094430Z UID:idkc4qbpnht4br2eqmm7jh9tj8@google.com CREATED:20110418T142400Z DESCRIPTION:Title : The Yin and Yang of Amyloids: Insights From a-Synuclein and the Pmel 17 Repeat Domain\nSpeaker Name: Dr. Jennifer Lee\nSpeaker Ins titution : NHLBI\, National Institutes of Health\nNotes: Refreshments at 3: 45pm LAST-MODIFIED:20230127T205018Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101011T200000Z DTEND:20101011T210000Z DTSTAMP:20260828T094430Z UID:n931vh1tes5a6qduvdfbhsdfj0@google.com CREATED:20101004T134307Z DESCRIPTION:Speaker: Ilya Nemenman\, Emory University\n \nTitle: "Adiaba tic dynamics in nonlinear\n stochastic systems: From molecu les to\n evolution" LAST-MODIFIED:20230127T204057Z LOCATION:IPST 1116 (Bldg 085) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:BIOPHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110502T163000Z DTEND:20110502T173000Z DTSTAMP:20260828T094430Z UID:uajlj42q1h22jmbsb0mikhq13o@google.com CREATED:20110426T205932Z DESCRIPTION:TITLE: Quantum Information Processing and Metrology Using Few E lectron Spins in Solids.\nSPEAKER: Amir Yacoby\, Harvard University\nABSTRA CT: Many different physical realizations of quantum bits have been studied over the past decade\, including trapped ions\, nuclear spins of molecules in solution\, Josephson junctions and more. Among the different possible re alizations\, solid-state implementations have attracted considerable intere st due to their promise in miniaturization and scaling\, taking advantage o f existing technology for fabrication. The spin qubit is one such example where a quantum bit of information is encoded in the spin state of a single electron confined to a small spatial dimension. \nIn this talk I will disc uss some of our recent work on single electron spin qubits in GaAs quantum dots and color centers in diamond. In these systems spin decoherence arises predominantly from the interaction with proximal paramagnetic spins such a s nuclear spins of the host lattice. However\, the slow dynamics of this en vironment lends itself to effective decoupling schemes that allow extending coherence to nearly a millisecond. Paradoxically\, coupling to the seeming ly random environment of nuclear spins provides valuable resources for stor age\, single shot readout and fast manipulation of quantum information with important applications to quantum information processing and metrology. \n \n LAST-MODIFIED:20230127T203958Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101027T193000Z DTEND:20101027T203000Z DTSTAMP:20260828T094430Z UID:dp9fms9njveji33bfubcmc6kc8@google.com CREATED:20101021T161840Z DESCRIPTION:Title: Recent breakthroughs in photodetector and optical sensor technologies\n \nJoe Campbell\, Lucian Carr Chair\, Professor of Electrica l and Computer Engineering\nUniversity of Virginia\n \nRecent breakthroughs in photodetector and optical sensor technologies have increased the perfor mance and functionality of a wide range of existing systems as well as enab ling new applications. At present\, my group at the University of Virginia is working on the following projects: Avalanche photodiodes (UV APDs – SiC and GaN on SiC\; Low-noise avalanche photodiodes (APDs)\; -mode and Geiger- mode APD arrays\; Impact ionization engineered APDs)\, High performance tel ecommunications receivers\, High sensitivity arrays (Si-Ge p-i-n and APDs f or CMOS integrated optical receivers)\, High-power\, high-speed photodiodes for analog fiber optic links (Photodiodes with ultra low intermodulation d istortion and high saturation current\,Monolithically integrated balanced d etectors)\, Organic and inorganic solar cells.\nThis talk will focus on our work on low-noise APDs with a brief description of other projects. In orde r to reduce the excess noise of APDs we have incorporated new materials and impact ionization engineering with beneficially designed heterostructures. This has resulted in previously thought to be theoretically unattainable. LAST-MODIFIED:20230127T204116Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131211T133000 DTEND;TZID=America/New_York:20131211T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20131211T133000 CREATED:20130816T163032Z DESCRIPTION:Title: Density perturbations in Hybrid Inflation\n\nSpeaker: Ev angelos Sfakianakis \n\nInstitution: MIT\n\nAbstract: Hybrid Inflation mod els lead to a spike in the density power spectrum at small scales\, compare d to the CMB. I will describe a new method for treating perturbations in th ese models\, which avoids treating the fluctuations of the ``waterfall" fie ld as if they were quantum perturbations about a classical trajectory. In t his method only the waterfall field is quantized\, while being treated as a free quantum field with a time-dependent m^2\, which evolves from positive values to tachyonic values. An extension to the case of multiple waterfall fields will be presented\, where the leading order results take a particul arly simple form. Finally I will discuss the possibility of the perturbati ons to act as seeds of black holes\, potentially supermassive ones. \n LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121003T200000Z DTEND:20121003T213000Z DTSTAMP:20260828T094430Z UID:7qmmbs1t3jflo7k99vnshu3tlc@google.com CREATED:20120928T135902Z DESCRIPTION:Title : "Properties of Antimatter Studied at the CERN Antiproto n Decelerator"\n\nSpeaker Name: Marco Giammarchi\n\nSpeaker Institution : I stituto Nazionale Fisica Mucleare - Sezione di Milano\n\nAbstract : Antimat ter was one of the main predictions of relativistically invariant quantum t heory. Production and detection of antiparticles took place during the pas t century\, mostly in the high energy regime. Neutral antimatter systems w ere first produced in 1996 at high energies at CERN and at Fermilab. Low e nergy (sub-thermal) antimatter was produced in 2002\, and antihydrogen was confined for the first time in 2011. This research opens the way to a new frontier: the study of fundamental laws (CPT and the Weak Equivalence Princ iple) with antihydrogen. LAST-MODIFIED:20230127T205056Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081003T173000Z DTEND:20081003T183000Z DTSTAMP:20260828T094430Z UID:rhi2f0ggk9jics6pn7bbvpq1i8@google.com CREATED:20080929T122321Z DESCRIPTION:Speaker: Peter Shawhan\, University of Maryland\nTitle: "Recent Results from LIGO"\nMore Information: eracine@umd.edu\n LAST-MODIFIED:20230127T205053Z LOCATION:room 4102 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20080929T203000Z DTEND:20080929T213000Z DTSTAMP:20260828T094430Z UID:d7gfqfbvbjs65618ku5i80hm18@google.com CREATED:20080912T165242Z DESCRIPTION:Speaker:Hoseok Ahn\, University of Maryland\nTitle:"TBA"\nWebpa ge:http://space.umd.edu:8080/\nFor more information\, contact John Paquette \n\n(See paquette@umtof.umd.edu)\n LAST-MODIFIED:20230127T203929Z LOCATION:Computer and Space Sciences\, Room: 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110407T180000Z DTEND:20110407T193000Z DTSTAMP:20260828T094430Z UID:pg56u64edo31aqtslk4q92ad40@google.com CREATED:20110406T140820Z DESCRIPTION:Speaker: Dr. Nuh Gedik\, Massachusetts Institute of Techology\ nTitle: Probing the Topological Insulators with Ultrashort Laser Pulses\nT opological insulator (TI) is a new phase of matter that exhibits quantum-Ha ll-like properties\, even in the absence of an external magnetic field. Cha rge carriers on the surface of a TI behave like a two-dimensional gas of ma ssless helical Dirac fermions in which the spin is locked perpendicular to the momentum. Understanding and characterizing unique properties of these m aterials can lead to novel applications such as current induced magnetizati on or extremely robust quantum memory bits. In this talk\, I will give a br ief overview of this field and discuss recent experiments in which we used ultrafast laser pulses to probe the fascinating properties of these systems . In particular\, I will present our recent measurements in which we simult aneously mapped all three components of spin over the entire Dirac cone of a TI by using circularly polarized ultrafast laser pulses to perform novel time-of-flight based angle-resolved photoelectron spectroscopy. I will show that an idealized description of helical Dirac fermions only applies withi n a small energy window about the Dirac point\, beyond which strong textura l deformations occur.\n LAST-MODIFIED:20230127T204257Z LOCATION:Rm 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110606T140000Z DTEND:20110606T150000Z DTSTAMP:20260828T094430Z UID:pn0saekr76te008rtbh81rjlp4@google.com CREATED:20110531T201441Z DESCRIPTION:Speaker: Dr. W.F. van Dorp\nAffiliation: Materials Science Grou p\, Zernike Institute for Advanced Materials\, University of Groningen\, Ne therlands\nTitle: Ultra-small patterns and ultra-thin membranes: sub-1 nm l ithography with electrons\nAbstract: Of all lithography techniques that use particles to define patterns (photons\, electrons\, ions)\, the highest re solution can be obtained with focused electron beam induced deposition (FEB ID). FEBID is a technique that uses a focused beam of electrons to define p atterns directly on the sample by dissociating adsorbed precursor molecules .\nThe smallest features written with FEBID are sub-1 nm features in the sc anning transmission electron microscope ( STEM). Simulations and experiment s indicate that it is possible to push FEBID to the ultimate resolution and deposit single atoms. With modern STEMs it is possible to image single ato ms\, provided that ultra-thin membranes are used as a support.\nResults fro m growth on two ultra-thin membranes are presented. The first is an amorpho us carbon membranes produced from self-assembling monolayers (SAM)\, having a thickness of 1 nm. The other is graphene.\nOn the 1 nm thick SAM membran e\, delocalization was observed during the nucleation stage of FEBID. When using a 0.17 nm e-beam a 1 nm thick membrane\, deposit nuclei were randomly distributed over an area of about 4 nm in diameter surrounding the point o f irradiation.\nDelocalization also occurred on the graphene\, but differen tly. On the graphene\, the nuclei were not randomly distributed. Isolated d eposits as small as 0.6 nm could be grown at the point of irradiation and a dditional nuclei were found along edges nearby. \nIn the presentation\, I w ill discuss possible mechanisms behind the observed delocalization and pres ent the progress for the deposition of a single atom.\n LAST-MODIFIED:20230127T205024Z LOCATION:CHE 2108 (chemical and nuclear engineering building (building 90)) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081020T200000Z DTEND:20081020T210000Z DTSTAMP:20260828T094430Z UID:njhuqk9j2rpd9mdnma1r5ui434@google.com CREATED:20081015T154939Z DESCRIPTION:Speaker: Professor Michael Gilson\, Center of Advanced Research in Biotechnology\, University of Maryland Biotechnology Institute\, Rockvi lle\, MD\,\nTitle: "Modeling Molecular Recognition: Entropy\, affinity and design." \nMore Information: Refreshments served at 3:45pm\nPlease contact Dr. Thirumalai\, Coordinator LAST-MODIFIED:20230127T204913Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091105T203000Z DTEND:20091105T213000Z DTSTAMP:20260828T094430Z UID:qe2dbf2pe2pniavtf2ct71g4h4@google.com CREATED:20091027T184514Z DESCRIPTION:[Speaker] Thomas Cohen\n[Institution] University of Maryland\n[ Title] “Baryons and Holography”\n[Abstract] The duality between certain str ongly coupled gauge theories and classical gravity in higher dimensions has inspired many attempts to model QCD. This talk focuses on attempts to des cribe baryons in the context of such models. A set of “rule of the game” are proposed as minimum conditions for sensible holographic models of baryo ns . It is shown that these rules are highly constraining and rule out la rge classes of possible models. However\, it is possible to construct whic h satisfy these rules. \n LAST-MODIFIED:20230127T204944Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MCFP Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090211T210000Z DTEND:20090211T220000Z DTSTAMP:20260828T094430Z UID:pms4ncfohvku27msklrsbbtb2k@google.com CREATED:20090126T131728Z DESCRIPTION:Speaker: Dr. Sergei Nikitin\, Naval Research Lab\nTitle:Product ion of Cumulative Jets Generated by Laser-Driven Collapsing Hollow Cones LAST-MODIFIED:20230127T204648Z LOCATION:Energy Research Facilty (Bldg 223)\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130916T190000Z DTEND:20130916T200000Z DTSTAMP:20260828T094430Z UID:kq8i6bo44ccejpla7rbik54bjg@google.com CREATED:20130816T162559Z DESCRIPTION:Title: The local Callan-Symanzik equation: structure and applic ations\n\nSpeaker: B. Keren-Zur\, EPFL Lausanne\n\nAbstract: The local Call an-Symanzik equation describes the response of a quantum field theory to lo cal scale transformations in the presence of background sources. The consis tency conditions associated with this anomalous equation can be used to der ive powerful constraints on RG flows. We will discuss various aspects of th e equation and present new results regarding the structure of the anomaly. We then use the equation to write correlation functions of the trace of the energy-momentum tensor off-criticality. LAST-MODIFIED:20230127T205020Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111212T173000Z DTEND:20111212T183000Z DTSTAMP:20260828T094430Z UID:pjb0dh8gfqh9e9d2fbn9uupq0k@google.com CREATED:20111129T150700Z DESCRIPTION:Title: Superconducting contacts to topological insulators\nSpea ker: David Goldhaber-Gordon\, Stanford University Physics Department\nAbstr act: I will explain motivation for studying proximity-induced superconducti vity in surface states of topological insulators and will present experimen tal results on the phenomenology of transport through superconductor-normal -superconductor junctions\, where the "normal metal" is a topological insul ator. We find that a supercurrent flows through the topological insulator\, likely through its surface state. I will speculate on physical connections between the transport properties and the junction geometry.\n\n LAST-MODIFIED:20230127T204124Z LOCATION:Physics room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - David Goldhaber Gordon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110916T180000Z DTEND:20110916T220000Z DTSTAMP:20260828T094430Z UID:odpmio0ni9mjdd4mo23gabvffk@google.com CREATED:20110908T140949Z DESCRIPTION:There will be 11 talks\, each 15 minutes long including questio ns\, and (hopefully) suitable for a general JSI audience that is not expert in the speaker's field.\n\n2-3 pm -- "Gravitational Wave Phenomena" (Berna rd Kelly\, Yi Pan\, Scott Field\, Tyson Littenberg)\n3:30-4:30 pm -- "Astro physics of Supermassive Black Holes and Galaxies" (Tamara Bogdanovic\, Marg aret Trippe\, Simona Giacintucci\, David Fisher)\n5-5:45 pm -- "General Rel ativistic Two-body Dynamics" (Alexandre Le Tiec\, Sam Gralla\, James van Me ter) LAST-MODIFIED:20230127T205229Z LOCATION:Room 2400 Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI MIni-Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130207T190000Z DTEND:20130207T203000Z DTSTAMP:20260828T094430Z UID:t0kqip78vs32lqpi3f5kprveac@google.com CREATED:20130201T174927Z DESCRIPTION:Speaker: Milan Allan\, ETH\, Zurich\n\nTitle: Atomic-scale Vis ualization of Electronic Nematicity and Cooper Pairing in Iron‐based Superc onductors\n\nAbstract: The mechanism of high-temperature superconductivity in the relatively novel iron-based high-Tc superconductors is unresolved\, both in terms of how the phases evolve with doping\, and in terms of the ac tual Cooper pairing process. I will discuss our discovery of strong electro nic nematicity in the parent state of iron-based superconductors [1]\, and the recent realization of how dopant-atom induced unidirectional impurity s tates and anisotropic scattering can explain the mysterious anisotropic tra nsport characteristics in this material [2]. Then I will describe our expl oration of the superconducting energy gaps in the canonical Fe-based superc onductor LiFeAs [3]. If strong electron-electron interactions between neigh boring Fe atoms mediate the Cooper pairing in iron-pnictide superconductors \, then specific and distinct anisotropic superconducting energy gaps Δi(k) should appear on the different electronic bands i. We introduced intra-ban d Bogoliubov quasiparticle scattering interference (QPI) techniques for det ermination of Δi(k) in such materials\, and identify three hole-like bands and determine the anisotropy\, magnitude and relative orientations of their gaps Δi(k). Finally\, the electron-electron interactions generating Coope r pairing are often conjectured to involve bosonic spin fluctuations genera ted by interband scattering of electrons. We explore the STM signatures of both the interband scattering and the electron-boson coupling self-energy i n LiFeAs\, and detect the signatures of the electron-boson coupling [4]. \n \n[1] T.-M. Chuang & M.P. Allan\, et al.\, Nematic electronic structure in the ‘parent’ state of the iron-based superconductor Ca(Fe1-xCox)2As2. Scien ce 327\, 181 (2010).\n[2] M.P. Allan et al.\, Anisotropic impurity states\, quasiparticle scattering\, and nematic transport in underdoped Ca(Fe1-xCox )2As2. Nature Physics\, in press (2013). \n[3] M. P. Allan & A.W. Rost et a l.\, Anisotropic energy-gaps of iron-based superconductivity from intra-ban d quasiparticle interference in LiFeAs. Science 336\, 563 (2012).\n[4] M. P . Allan et al\, in preparation (2013).\n\nHost: Ian Appelbaum LAST-MODIFIED:20230127T205256Z LOCATION:Physics Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium w/MILAN ALLAN TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081210T210000Z DTEND:20081210T220000Z DTSTAMP:20260828T094430Z UID:sb1b37682rbqio18hov4jhkjtk@google.com CREATED:20081208T133552Z DESCRIPTION:Speaker: Dr. Lee J Helman\, M.D.\, Scientific Director of Cli nical Research\, National Cancer Institute\, NIH\, Head\, Molecular Oncolo gy Section\, Pediatric Oncology Branch\, NCI/NIH.\nTitle: Translating canc er biology into cancer medicine LAST-MODIFIED:20230127T204537Z LOCATION:Rm 3206 (Math Colloquium Room)\, Math Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cancer Dynamics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090505T160000 DTEND;TZID=America/New_York:20090505T170000 DTSTAMP:20260828T094430Z UID:oiherbvqgudjapqso6ocvvvkmc@google.com RECURRENCE-ID;TZID=America/New_York:20090505T160000 CREATED:20090126T164931Z DESCRIPTION:Speaker: Raj Roy\, University of Maryland\nTitle: Signals that Synchronize: Sensor Networks and the Brain LAST-MODIFIED:20230127T204241Z LOCATION:Physics Building\, Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120427T130000Z DTEND:20120427T220000Z DTSTAMP:20260828T094430Z UID:bu4cui1hjrv75ur7l6lkk10gp4@google.com CREATED:20120202T163909Z DESCRIPTION:This symposium\, held on the occasion of the 70th birthday of\n Professor Mikhail A. Anisimov\, will deal with contemporary issues in therm odynamics and statistical physics emerging at mesoscales in a variety of so ft condensed matter systems.\nFollowed by Reception\, Gala Dinner\, & Perfo rmance by\nWorld-Renowned Cellist Tanya Anisimova.\nInvited Speakers:\nChri stopher E. Bertrand\, M. I. T.\, Cambridge\, USA\nPeter J. Collings\, Swart hmore College\, Swarthmore\, USA\nMichael E. Fisher\, University of Marylan d\, College Park\, USA\nM. Laura Japas\, C. N. E. A.\, Buenos Aires\, Argen tina\nEfim I. Kats\, Landau Institute\, Chernogolovka\, Russia\nAnneke Leve lt Sengers\, N. I. S. T.\, Gaithersburg\, USA\nCornelis J. Peters\, Petrole um Institute\, Abu Dhabi\, UAE\nH. Eugene Stanley\, Boston University\, Bos ton\, USA\nJan Thoen\, KU Leuven\, Leuven\, Belgium\nhttp://www.mesothermal .umd.edu/symposium.html LAST-MODIFIED:20230127T205250Z LOCATION:Jeong H. Kim Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:International Symposium on MESOSCALE AND FLUCTUATION THERMODYNAMICS TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130528T150000Z DTEND:20130528T160000Z DTSTAMP:20260828T094430Z UID:befk0stva2qoje98d47ppphkh0@google.com CREATED:20130522T131327Z DESCRIPTION:Title: Dynamics and thermodynamics of linear quantum open syste ms: heat transport in an ion crystal\nSpeaker: Juan Pablo Paz\, Department of Physics\, FCEyN\, University of Buenos Aires\, Argentina\nAbstract: I will present general results concerning the evolution and the emergence of the laws of thermodynamics for arbitrary networks of quantum oscillators co upled with arbitrary reservoirs. For such systems\, I will show that the qu antum state of the network always satisfies a local master equation with a simple analytical solution. Then\, I will use this to demonstrate the emerg ence of the laws of thermodynamics in the long time regime.\nFinally\, I wi ll apply these results to\nstudy properties crystals formed by cold trapped ions. As it is well known\, depending on the number of ions and on the tra pping fields\, this system undergoes a series of phase transitions where th e structure of the ion crystal changes from 1D to 3D.\nFor all these cases\ , I will analyze the\nconduction of heat through the crystal and discuss th e (non)--recovery of Fourier's law. LAST-MODIFIED:20230127T204211Z LOCATION:2115 Computer & Space Sciences SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Talk by Juan Pablo Paz TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090219T190000Z DTEND:20090219T200000Z DTSTAMP:20260828T094430Z UID:m794ochcj8vfic1ghkqo0dnu6g@google.com CREATED:20090216T184524Z DESCRIPTION:Title: Was Einstein right-handed?\nSpeaker: Nico Yunes\, Prince ton University\nMore Information: Abstract: What if the gravitational inter action possessed a preferred handedness and violated parity? We know that M axwell's electromagnetism respects this\nsymmetry\, but the weak-sector of the standard model violates it maximally.\nIn this talk\, we shall explore a string-theory motivated\, effective theory\,\nChern-Simons modified gravi ty\, that models such parity-violation by introducing\na novel curvature-sq uared term to the Einstein-Hilbert action.\nWe shall analyze observables di rectly related to gravitational parity violation\,\nincluding orbital prece ssion and gravitational radiation. We shall conclude with\na discussion of binary pulsar and Solar System observations that have already\nconstrained such signatures\, as well as planned gravitational wave detectors that\nhol d the promise to bring these constraints to a new level. LAST-MODIFIED:20230127T204927Z LOCATION:Physics Building\, Room 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120220T164500Z DTEND:20120220T173000Z DTSTAMP:20260828T094430Z UID:tr46stfsahfsv20q06vjvtkhv0@google.com CREATED:20120215T162348Z LAST-MODIFIED:20230127T204626Z LOCATION:1305F "New Toll Room" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100507T170000Z DTEND:20100507T180000Z DTSTAMP:20260828T094430Z UID:rgf6j1877futf3hb4qe3dovsmo@google.com CREATED:20100503T122416Z DESCRIPTION:Title: Building an R&D Based Company\n\nPresented by R. D. Visp ute\nCEO & CTO Blue Wave Semiconductors\, Inc.\n\nEntrepreneurship is the w ellspring of innovation and the ability to seek out opportunities and turn them to profitable businesses. It is also closely associated with desire to succeed with taking risk. Entrepreneurs are also major employers\, as smal l businesses generate 60-80 percent of all new jobs annually. In this regar d\, having your own business is regarded as one of the most respectable pat hways to prosperity and fulfillment. In my talk I will present my experienc e in starting my technology based company\, “Blue Wave Semiconductors\, Inc .” I will focus on opportunities as well as numerous factors faced as the s mall technology start-up including finance\, access to Small Business Innov ation Research (SBIR)\, identifying market\, managerial skills\, team and i nfrastructure development. Also\, I will highlight some of the important fa ctors such as perseverance\, independence\, ingenuity\, confidence and the determination to overcome barriers for eventual success.\n\nThis seminar is hosted by the MSGS. LAST-MODIFIED:20230127T205023Z LOCATION:Room 2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100419T163000Z DTEND:20100419T173000Z DTSTAMP:20260828T094430Z UID:1nn090m4417f411u1epsmos31k@google.com CREATED:20100129T135410Z DESCRIPTION:Title : Schrodinger's Cat - The Movie\nSpeaker Name: John Marti nis\nSpeaker Institution : Santa Barbara\nAbstract : The thought experiment of Schrodinger's cat illustrates the wave-particle duality in quantum mech anics\, which originates from the two distinct ways in which a quantum stat e may change: a linear (unitary) evolution according to the Schrodinger wav e equation\, and a nonlinear (projective or collapse) evolution due to meas urement. A model system to observe this collapse is the harmonic oscillato r\, since a “Schrodinger's cat state” can be prepared as a superposition of coherent states\, and its subsequent evolution becomes probabilistic due t o system decoherence. Here we present a movie of the collapse of the cat state from a coherent to incoherent superposition\, obtained by measuring t he cat state during its decay for 60 time steps. Movies can be downloaded at www.physics.ucsb.edu/~martinisgroup.\n\nThe cat states are prepared by c oupling a superconducting phase qubit to a high-Q coplanar wave guide reson ator. The qubit is used to pump photons into the resonator and\, subsequen tly\, read out its state\, and has been used previously to prepare and dete ct photon number states (Fock states). Using a generalization of this schem e by Law and Eberly\, we can now create arbitrary quantum states of the pho ton field with up to approximately 10 photons: the deterministic synthesis of such states can be considered as the quantum version of a digital to ana log converter. The states are analyzed by directly mapping out the corresp onding Wigner function\, which is the phase-space equivalent to the density matrix LAST-MODIFIED:20230127T204801Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110303T163000Z DTEND:20110303T173000Z DTSTAMP:20260828T094430Z UID:h7lrnt49g30u7ej44tv4er24po@google.com CREATED:20110215T160420Z DESCRIPTION:[Topic] Ultra-low Q values for neutrino mass measurements\n[Ref erence] arXiv:0911.3329v2 [hep-ph]\n[Presenter] Carter Hall LAST-MODIFIED:20230127T204947Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:NPAC Lunch Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101019T200000Z DTEND:20101019T210000Z DTSTAMP:20260828T094430Z UID:5dq5orslfgfnvriohh07gqvguc@google.com CREATED:20100825T174955Z DESCRIPTION:Speaker: Walter Kohn\, Kavli Institute for Theoretical Physics\ nTitle: A World Powered Predominantly by Solar and Wind Energy\nAbstract: T otal oil plus natural gas production (or consumption)\, which currently pro vides about 60 % of global energy use\, is expected to peak in 10 - 20 year s\, followed by a rapid decline. During that same time interval\, the devel oping world will see an approximate doubling of its population as well as a n approximate tripling in per capita energy consumption. The near-coinciden ce of these three galloping trends has created two unprecedented global cha llenges: The threatened global shortage of acceptable energies and the immi nent danger of unacceptable global warming and its consequences. This lectu re describes a possible way of coping with this predicament: A concerted co mmitment to a changeover from the current era\, dominated by oil plus natur al gas\, to a future era dominated by solar and wind energy\, both of which are clean and effectively inexhaustible. However\, this optimistic perspec tive must be tempered with the realization that\, unless there are technolo gical breakthroughs\, the energy of this future era would be much more cost ly than at this time. In the Developed World this would require a change of lifestyle: population stabilization and greater energy effectiveness and c onservation. LAST-MODIFIED:20230127T203953Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131206T180000Z DTEND:20131206T190000Z DTSTAMP:20260828T094430Z UID:mff7u7p12gfnmgmo86hrf39i78@google.com CREATED:20131120T135307Z DESCRIPTION:Title : Scratch and Mar Resistance in Coatings via Microstcratc h and Optical Scattering Metrologies\n\nSpeaker Name: Aaron M. Forster\n\nS peaker Institution : NIST\n\nAbstract : cratch and mar resistance is import ant for the performance of coatings and composites used as a glossy protect ive layer in consumer products. These products include a wide range of mate rial systems including crosslinked polyurethane and epoxy coatings for wood floors and automotive paints to semicrystalline polyvinylidene fluoride (P VDF) coatings for exterior architectural applications. The coatings are exp ected to remain “damage free” by resisting environmental and wear damage ov er the lifetime of the product. Creating a material that both resists all s cratch damage\, but meets optical clarity requirements is not trivial. The formulator is required to balance stiffness\, hardness\, and viscoelasticit y to optimize physical properties\, while maintaining optical properties. T his is a daunting task for a formulator without the tools to assess scratch resistance in a quantifiable manner.\n\nThere are two challenges in the as sessment of scratch and mar resistance in coatings. The first is the develo pment of a repeatable methodology to induce damage at the surface of a coat ing. The second is a reliable methodology to quantify scratch visibility as a function of damage. NIST has developed a methodology that addresses both challenges and is applicable to a variety of material systems. This talk w ill describe this methodology and provide examples of the role coating prop erties play in scratch visibility. A model epoxy will used to demonstrate t he connection between viscoelastic properties of the network and scratch da mage. A semicrystalline PVDF will be used to demonstrate the impact of semi -crystalline microstructure on visibility.\n LAST-MODIFIED:20230127T205251Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130920T170000Z DTEND:20130920T180000Z DTSTAMP:20260828T094430Z UID:g30noh5n92klq1bbio86q7khl4@google.com CREATED:20130912T143358Z DESCRIPTION:Title : Multiscale Structural Features of Multi-Acrylate Networ ks Produced by Radiation-Initiated Polymerization\nSpeaker Name: Xavier Coq ueret\nSpeaker Institution : Université de Reims Champagne Ardenne\nAbstrac t : The radiation-initiated crosslinking polymerization of multifunctional monomers is a very attractive method for the fabrication of coatings and hi gh performance composite materials. The method offers many advantages compa red to conventional energy- and time-consuming thermal curing processes.1) However\, the fast polymerization of multiacrylates is known to generate mi cro-heterogeneous networks. In order to gain an insight into the polymer mi crostructure\, a combination of analytic methods was used to quantify polym er segment mobility in the different domains.\n\nSolid state proton T2 NMR relaxation experiments were performed on radiation-cured materials prepared from model difunctional monomers. This method allowed us to distinguish tw o phases inside the materials: one consisting in rigid domains\, and a seco nd one with higher local mobility and distinct relaxation features.2) The d ecay of transverse magnetization was fitted with two components\, (short or long T2)\, which can be assigned to the highly cross-linked and the loosel y cross-linked phase\, respectively. The influence of acrylate conversion o n the relaxation behavior of cured samples was examined to describe the gra dual evolution of the different domains\, in terms of local mobility and as sociated fraction of material\, as the radiation-induced polymerization pro ceeds. Network analysis by atomic force microscopy in the phase imaging mod e provides a complementary picture of the network with indications on the a ctual dimensions of the soft and rigid domains.3) Temperature-modulate d D SC thermograms can be further analyzed in the light of these results.4) Com paring the NMR relaxation data as well as the calorimetric features of netw orks prepared by UV- or by EB-induced polymerization did not reveal noticea ble differences to be related to the initiation mechanism and/or curing con ditions. Various structural and kinetic data will be discussed for interpre ting the observed polymerization behavior of the model diacrylates.\n\nImpr oving fibre-matrix adhesion and upgrading polymer network toughness are cur rently the two major challenges in this area. The efforts to overcome the b rittleness associated with the heterogeneities described above are focused on new formulations including a high Tg thermoplastic toughener.5\,6) Parti cular attention is also paid on the functional groups present at the surfac e of carbon fibres\, as identified and quantified by XPS analysis. Free rad ical reactions are suspected to be less efficient in the vicinity of the ca rbon materials. We are evaluating the influence transfer agents attached to the carbon materials for forcing the formation of covalent links with the matrix. Significant improvements are achieved on transverse strain at break by applying original surface treatments to the fibres so as to induce cova lent coupling with the matrix.7\,8)\n\nReferences\n\n(1) Litvinov V. M.\, D ias A. A.\, Macromolecules\, 2001\, 34\, 4051-4060.\n\n(2) Coqueret X.\, Kr zeminski M.\, Ponsaud P.\, Defoort B.\, Radiat. Phys. Chem. 2009\, 78\, 557 -56.\n\n(3) Krzeminski M.\, Molinari M.\, Troyon M.\, Coqueret X.\, Macromo lecules 2010\, 43\, 8121-8127.\n\n(4) Krzeminski M.\, Molinari M.\, Troyon M.\, Coqueret X.\, Macromolecules 2010\, 43\, 3757-3763.\n\n(5) Krzeminski M.\, Molinari M.\, Defoort B.\, Coqueret X.\, Radiat. Phys. Chem. 2013\, 84 \, 79-84.\n\n(6) Krzeminski M.\, Defoort B.\, Coqueret X.\, PCT Int. Appl. WO 2011-042554\, 2011./span>\n\n(7) Defoort B.\, Ponsaud Ph.\, Coqueret X.\ , PCT Int. Patent PCT/EP2007-0545\, 2007.\n\n(8) Krzeminski M.\, Ponsaud. P h.\, Coqueret X.\, Defoort B.\, Larnac G.\, Avila R.\, SAMPE 2011 Long Beac h\, May 23-26\, 2011.\n\nAbout the Speaker\nXavier Coqueret\, born in 1956\ , received his doctorate in Organic Chemistry from the University of Reims in 1984. He joined at that time the Polymer group at the University of Lill e\, as an associate scientist of the CNRS (Centre National de la Recherche Scientifique). After a one-year leave at the Max-Planck-Institut fur Polyme rforschung in Mainz (Germany) as an Alexander-von-Humboldt Foundation fello w (1989-1990)\, Xavier Coqueret was appointed as Professor of Polymer Chemi stry at the Ecole Nationale Supérieure de Chimie de Lille (1991). His major area of research since then is polymer photochemistry with emphasis on the synthesis and reactivity of functionalized macromolecules. His activities were extended to the electron beam-induced modification of polymers by cros s-linking or by grafting\, and to radiation-initiated polymerizations.\n\nI n September 2005\, Xavier Coqueret moved to the University of Reims Champag ne Ardenne to initiate a research activity on Polymer chemistry\, with emph asis on clean chemical processes involving radiation treatment as well as o n new products and materials derived from biomass. He teaches analytical ch emistry\, polymer chemistry and chemical valorization of bio-sourced raw ma terials. Since January 1st 2008\, he is heading the Institute of Molecular Chemistry\, a research Institute under contract with CNRS (UMR 7312). He is the author or co-author of about 150 scientific papers and 12 patents.\n LAST-MODIFIED:20230127T203933Z LOCATION:Room 2110\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111006T180000Z DTEND:20111006T193000Z DTSTAMP:20260828T094430Z UID:lbjlfpku6v8eve8spa5jrg2pis@google.com CREATED:20110914T202937Z DESCRIPTION:Speaker: Alex Gurevich\, Dept. of Physics\, Old Dominion Unive rsity\, Norfolk\, VA\nTitle: Fe-based superconductors at high magnetic fie lds.\nAbstract: Low carrier densities and short coherence lengths in the r ecently discovered semi-metallic Fe-based superconductors (FBS) can result in exotic behaviors at strong magnetic fields due to the interplay of multi band superconductivity\, unconventional pairing symmetry and the Zeeman and orbital pairbreaking. I this talk I will give an overview of these effects in FBS\, particularly the anomalous temperature dependencies of the upper critical field Hc2(T) which often extrapolate to Hc2 > 100 Tesla at low tem peratures. The materials features of FBS and the multiband s pairing symme try with the sign change of the order parameter on different sheets of the Fermi surface can significantly increase Hc2(T) and facilitate the Fulde-Fe rrel-Larkin-Ovchinnikov (FFLO) transition to the state with a spatially mod ulated order parameter. Small shifts of the chemical potential upon doping of FBS can produce new small pockets of the Fermi surface\, triggering the FFLO instability due to the Lifshitz transition. I will also discuss the e ffect of disorder\, particularly magnetic defects produced by -particle ir radiation. LAST-MODIFIED:20230127T205117Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120514T163000Z DTEND:20120514T173000Z DTSTAMP:20260828T094430Z UID:o144rjct5crrvohfgs5dvsf4ik@google.com CREATED:20120510T210252Z DESCRIPTION:Title: Long-range interactions in cold Rydberg gases.\nSpeaker : Ennio Arimondo\, Dipartimento di Fisica\, Universita’ di Pisa\, Italy\n A bstract: Atoms excited to high-lying quantum states\, so-called Rydberg at oms\, are highly polarizable and\, therefore\, can interact strongly with e ach other at large distances. These interactions make them attractive candi dates for studies of strongly correlated systems and the implementation of quantum logic gates. One central ingredient for the Rydberg applications is the dipole blockade. In this mechanism\, the excitation of an atom to a Ry dberg state is inhibited if another\, already excited\, atom is less than t he so-called blockade radius away. We have explored the dipole blockade for ultracold atoms and Bose-Einstein condensates.\nA key signature of interac tions between Rydberg atoms is the suppression of fluctuations in the numbe r of excitations due to the dipole blockade. We have performed a systematic study of the sub-Poissonian statistics in the number of Rydberg excitation s in a magneto-optical trap. Our experimental results are compared to a nov el theoretical model based on Dicke states of Rydberg atoms including the d ipole-dipole interactions. \nWe have realized experimentally Rydberg excita tions in Bose-Einstein condensates of rubidium atoms loaded into quasi-one- dimensional traps and in optical lattices. Our results for condensates expa nded to different sizes in the one-dimensional trap agree well with the int uitive picture of a chain of localized collective Rydberg excitations inclu ding nearest-neighbor blockade.\n LAST-MODIFIED:20230127T204438Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Ennio Arimondo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110518T200000Z DTEND:20110518T210000Z DTSTAMP:20260828T094430Z UID:bc6j62r9pv19vbcj6qgrtkuoeo@google.com CREATED:20110510T180301Z DESCRIPTION:Title : Electron self-injection into an evolving plasma bubble: toward a dark current free GeV-scale laser plasma accelerator\nSpeaker Nam e: Dr. S. Y. Kalmykov\nSpeaker Institution : University of Nebraska - Linco ln\nAbstract : A bubble of electron density created by the radiation pressu re of a short laser pulse can travel with the driver over many centimeters and\naccelerate electrons trapped from the ambient plasma to a few GeV. Non linear refraction and depletion of the driving pulse cause variations of th e bubble shape and potentials\; these\, in turn\, can either stimulate or e xtinguish electron self-injection and thus directly affect the process of e lectron beam formation and determine its final characteristics. The new res ults [1] show that in low-density plasmas relevant to the next generation o f GeV-scale laser-plasma accelerators\, expansion of the bubble triggers se lf-injection. The bucket stabilization and contraction stops injection and thus limits electron beam charge and duration. Laser spot size oscillations caused by nonlinear refraction can induce the desired sequence of bubble e xpansion and shrinkage. Periodic repetition of the sequence\, however\, can degrade the beam quality [2]. In addition\, laser pulse self-compression a nd front steepening (resulting from the combination of pulse depletion due to the wake excitation and relativistic phase self-modulation) can also cau se continuous self-injection\, resulting in a large dark current\, degradin g the electron beam quality [3]. Using dense plasma slabs in the role of no nlinear lenses helps stabilize the bubble pulsations\, achieve phase space rotation\, and produce a quasi-monoenergetic bunch well before the de-phasi ng limit [4]. 3D particle-in-cell simulations complemented with the Hamilto nian diagnostics of electron phase space demonstrate robustness of the conc ept over a broad range of parameters. Modeling also shows that a single-sho t non- collinear optical probing (frequency-domain tomography [5]) can faci litate direct observation of bubble evolution and associate it with the obs erved electron beam characteristics. LAST-MODIFIED:20230127T204921Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081203T180000Z DTEND:20081203T193000Z DTSTAMP:20260828T094430Z UID:amn9ot1jb00q3c03163v40tpeo@google.com CREATED:20081201T162857Z DESCRIPTION:Title: "W/Z Boson Charge Asymmetry Measurements at D-Zero"\nSpe aker: Dr. Junjie Zhu\, Fermilab LAST-MODIFIED:20230127T205139Z LOCATION:Physics Building\, Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy-Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081119T180000Z DTEND:20081119T193000Z DTSTAMP:20260828T094430Z UID:bgq5ch0n9rrb8rqs7bc3ohiv44@google.com CREATED:20081114T202607Z DESCRIPTION:Title: "Liquid Argon Detectors at Fermilab: From R&D to Results "\nSpeaker: Dr. Brian RebelFermilab\n LAST-MODIFIED:20230127T204449Z LOCATION:1201 Physics SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110929T173000Z DTEND:20110929T180000Z DTSTAMP:20260828T094430Z UID:abs80hodd85hlsdntd7seac4jk@google.com CREATED:20110914T204039Z LAST-MODIFIED:20230127T204331Z LOCATION:Rm 1305F\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081022T200000Z DTEND:20081022T210000Z DTSTAMP:20260828T094430Z UID:akvedklm8322vc5e81bcn1n3co@google.com CREATED:20081020T183027Z DESCRIPTION:Speaker: Dr. Jim McNally (Director\, Flourescence Imaging Faci lity\, NCI/NIH)\nTitle: Toward an in vivo biochemistry by quantitative lig ht microscopy\nMore Information: Hosted by Wolfgang Losert and Doron Levy LAST-MODIFIED:20230127T204714Z LOCATION:CSIC Building\, Room 4122 (CSCAMM Seminar Room) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cancer Dynamics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20120411 DTEND;VALUE=DATE:20120412 DTSTAMP:20260828T094430Z UID:cskuekpu7g3qt8t3dsmeu4tfpg@google.com CREATED:20120406T150258Z DESCRIPTION:http://www.umer.umd.edu/events_folder/uBi12/ LAST-MODIFIED:20230127T204758Z LOCATION:A.V. Williams Bldg.\, Rm. 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:4th Microbunching Instability Workshop TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091102T213000Z DTEND:20091102T223000Z DTSTAMP:20260828T094430Z UID:r3d2bf884c9ii1bclli8o0q40s@google.com CREATED:20091006T130553Z DESCRIPTION:Title : What Is Solar Minimum and Why Should We Care?\nSpeaker Name: Dean Pesnell\nSpeaker Institution : GSFC\nAbstract : The study of sol ar minimum has been a poor cousin to solar maximum due to the large variati ons seen in the Sun during maximum. Solar activity is low or absent during solar minimum and all of the phenomena that follow the sunspot number are a lso smaller in frequency and strength. Even the definition of solar minimum is difficult because the main indicator of solar activity is zero for an e xtended period of time. But the Sun presents a different face at minimum. T he magnetic field is weaker but far more symmetric\, almost a dipole for th e few minimum that have been measured. A similar behavior is seen in the co rona measured by coronagraphs and magnetic fields measured in the heliosphe re. Particle fluxes in the solar wind are smaller. As a result the scatteri ng of galactic cosmic rays is reduced and a larger flux of GCRs is be seen at Earth. The current solar minimum has been extreme in having weaker surfa ce fields than previous measurements\, few spots for longer than!\n\n avera ge\, and an interesting signature in Earth¹s magnetic field. We shall discu ss these magnetic signatures and the implications for Space Weather and cli mate of a time with weak solar activity.\nTitle of Event: What Is Solar Min imum and Why Should We Care?\n LAST-MODIFIED:20230127T205227Z LOCATION:CSS 2400 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091019T160000Z DTEND:20091019T170000Z DTSTAMP:20260828T094430Z UID:qo721fdf6k4tho94j9if37n7s0@google.com CREATED:20091015T182441Z DESCRIPTION:Title : AppEl Seminar -- Generation of intense\, short pulses o f coherent THz radiation via laser plasma interaction Speaker Name: Howard Milchberg Speaker Institution : UMD -- IREAP\, ECE\, IPST\, PHYSICS\nNotes: Pizza and beverages will be provided.\n LAST-MODIFIED:20230127T203955Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IREAP Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101018T150000 DTEND;TZID=America/New_York:20101018T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20101018T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] Technicolor at Criticality\n[Speaker] Luca Vecchi\n[Ins titution] Los Alamos National Lab\n[Abstract] TBA LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110927T160000Z DTEND:20110927T170000Z DTSTAMP:20260828T094430Z UID:31f2bm1iljva9d99g810p336j4@google.com CREATED:20110919T201201Z DESCRIPTION:Title: Remote Atmospheric Lasing\nSpeaker: Dr. Joseph Penano\, Naval Research Laboratory LAST-MODIFIED:20230127T203928Z LOCATION:IREAP large conference room (Rm 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Electromagnetics seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131014T200000Z DTEND:20131014T210000Z DTSTAMP:20260828T094430Z UID:j1sg64b3cjj72vtqrpn1i6qbm4@google.com CREATED:20131007T180016Z DESCRIPTION:Title : Cooperation\, Cheating\, and Collapse in Microbial Popu lations\nSpeaker Name: Jeff Gore\nSpeaker Institution : MIT\n\nNotes: *Refr eshments served at 3:45pm\n LAST-MODIFIED:20230127T205022Z LOCATION:Marker Room\, 0112 Chemistry Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110228T173000Z DTEND:20110228T183000Z DTSTAMP:20260828T094430Z UID:u75m80pcbe324n58tuma1leok0@google.com CREATED:20110228T135316Z DESCRIPTION:Title: Probing the normal state in the BCS-BEC crossover\nSpeak er: Debbie Jin\, JILA\nAbstract: Superfluidity in a strongly interacting Fe rmi gas of atoms realizes a system that lies in a crossover region between Bose-Einstein condensation physics and the physics of BCS (Bardeen-Cooper-S chrieffer) superconductivity. Currently\, there is some debate about the na ture of the normal state in this system. I will present measurement using a n atom analog of photoemission spectroscopy to probe the normal state of th e strongly interacting Fermi gas. LAST-MODIFIED:20230127T204527Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130123T190000Z DTEND:20130123T200000Z DTSTAMP:20260828T094430Z UID:gc59gl7psnh5r8u94e7qqsmnns@google.com CREATED:20130118T152007Z DESCRIPTION:Speaker: Prof. Bill Rand\n Robert H. Smith School of Business\ , University of Maryland\nTitle: The Complex Network of Social Media\nAbst ract: The dramatic feature of social media is that it gives everyone a voic e\; anyone can speak out and express their opinion to a crowd of followers with little or no cost or effort\, which creates a loud and potentially ove rwhelming marketplace of ideas. The good news is that the organizations hav e more data than ever about what their consumers are saying about their bra nd. The bad news is that this huge amount of data is difficult to sift thro ugh. We will look at developing methods that can help sift through this tor rent of data and examine important questions\, such as who do users trust t o provide them with the information that they want? Which entities have the greatest influence on social media users? Using agent-based modeling\, mac hine learning and network analysis we begin to examine and shed light on th ese questions and develop a deeper understanding of the complex system of s ocial media. LAST-MODIFIED:20230127T205038Z LOCATION:CSCAMM Seminar Room 4122\, CSIC Building #406 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081017T170000Z DTEND:20081017T180000Z DTSTAMP:20260828T094430Z UID:bh6isg87im75timqulav4ids5g@google.com CREATED:20081010T151520Z DESCRIPTION:Title: "Generation\, Modulation and Electrical Detection of Spi n Currents in Silicon in a Lateral Transport Geometry"\nSpeaker: Dr. Berend T. Jonker\, Naval Research Laboratory\nMore Information: amateus@umd.edu/e xt. 55207 LAST-MODIFIED:20230127T204007Z LOCATION:Chemical and Nuclear Engineering Bldg.\, Rm. 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20110419T131500 DTEND;TZID=America/New_York:20110419T143000 RRULE:FREQ=WEEKLY;UNTIL=20110426T171500Z;BYDAY=TU DTSTAMP:20260828T094430Z UID:4pspa24rpcefp104m0c0ebulmc@google.com CREATED:00010101T000000Z DESCRIPTION:Title : Molecular Aggregation and Chromonic Liquid Crystals\nSp eaker Name: Professor Peter Collings\nSpeaker Institution : Swarthmore Coll ege\nNotes: For Further Information Contact:\nProfessor Christopher Jarzyns ki\, cjarzyns@umd.edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu\, (301)405-1610. \n LAST-MODIFIED:20230127T205009Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100308T150000Z DTEND:20100308T160000Z DTSTAMP:20260828T094430Z UID:ead7i8pf56inam25rdopmbl7n4@google.com CREATED:20100302T143253Z DESCRIPTION:Title : Noise Correlations and Coherent Coupling in Solid State Qubits\nSpeaker Name: David Marcos\nSpeaker Institution : CSIC\, Madrid\nN otes: For more events see website: http://www.physics.umd.edu/cmtc/seminars .html\nAbstract : In this seminar I will present recent advances in the fie lds of quantum transport and hybrid quantum systems. The former has incorpo rated a theory of counting statistics to investigate high-order current cor relations through nanoscopic conductors. These can reveal valuable informat ion such as coherence times and phase transitions. In particular\, I will a pply the theory to investigate the fluctuation-dissipation theorem in situa tions out of equilibrium and also show how a non-Markovian description beco mes essential to study quantum noise. In the second part\, I will review so me proposals that combine solid-state and quantum-optics systems in the con text of quantum information processing. I shall present a hybrid system con sisting on a flux qubit coupled to an ensemble of NV centers in diamond. At high densities coherent transfer between both systems becomes possible\, a nd therefore this opens the possibility of interfacing superconducting qubi ts with light. LAST-MODIFIED:20230127T204244Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100804T180000Z DTEND:20100804T190000Z DTSTAMP:20260828T094430Z UID:iqm5v19a603ju36ufu219bsii4@google.com CREATED:20100720T201901Z DESCRIPTION:[Title] "Dark Matter as a Window to TeV New Physics"\n[Speaker] Prof. Antonio Masiero\n[Institution] Univ. of Padua LAST-MODIFIED:20230127T204043Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090612T180000Z DTEND:20090612T190000Z DTSTAMP:20260828T094430Z UID:irp1qe7lcctpspuge38oucqslk@google.com CREATED:20090602T192101Z DESCRIPTION:Title: Post-Newtonian calculation of the gravitational self-for ce for black hole binaties\nSpeaker: Alexandre Le Tiec\, GReCO\, Institut d 'Astrophyque de Paris\nAbstract: The detection and analysis of the gravitat ional radiation from \nblack hole binaries by the VIRGO\, LIGO and LISA obs ervatories requires \nvery accurate theoretical predictions\, used as templ ates. There are two \napproximation schemes to perform such calculations in General \nRelativity: (i) the post-Newtonian theory\, well suited to descr ibe the \ninspiraling of arbitrary mass ratio compact binaries in the slow motion \nregime (v/c << 1)\, and (ii) the self-force approach\, which gives a very \naccurate description of extreme mass ratio binaries. It is crucia l to \ncompare both formalisms in their common domain of validity: the slow \nmotion regime of an extreme mass ratio binary. We present post-Newtonian \ncalculations carried out at 3PN order (i.e. (v/c)^6 beyond the Newtonian \napproximation) for the self-force of an extreme mass ratio black hole \n binary on circular orbit. Our result is in perfect agreement with the \nnum erical prediction of the self-force. LAST-MODIFIED:20230127T205147Z LOCATION:4102 PHYS SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091102T210000Z DTEND:20091102T223000Z DTSTAMP:20260828T094430Z UID:okmudng0nj1a5u40gedfg3nd0c@google.com CREATED:20091023T140539Z DESCRIPTION:Title : Sensing Voltage in Ion Channels\nSpeaker Name: Professo r Francisco Bezanilla\nSpeaker Institution : University of Chicago\nNotes: Refreshments at 3:45pm LAST-MODIFIED:20230127T204416Z LOCATION:IPST Bldg. 085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130912T140000 DTEND;TZID=America/New_York:20130912T150000 DTSTAMP:20260828T094430Z UID:pcgc6qai2rdvjsi5hf8uhsahpk@google.com RECURRENCE-ID;TZID=America/New_York:20130912T133000 CREATED:20130816T163136Z DESCRIPTION:Title: Probing the interior of neutron stars using their spin r ate and temperature observations\nSpeaker: Simin Mahmoodifar\, UMD\n\nAbstr act: Neutron stars (NSs) are the only known objects that contain equilibrat ed matter that is compressed beyond nuclear saturation density\, making the m valuable laboratories for the study of matter under extreme conditions. I n addition to hadronic matter their cores may also contain exotic forms of matter such as\, for example\, hyperons\, strange quark matter\, or color s uperconducting quarks. To probe the phases of cold ultra-dense matter we co mpute the transport and thermodynamic properties of different phases\, whic h depend on low energy degrees of freedom\, and predict the behavior of NSs made of matter in a given phase. Then by comparing our predictions with as trophysical observations we try to confirm or rule out the existence of a p articular phase in NSs. Studying dynamic properties of NSs such as spin fr equency and temperature evolution is particularly useful in revealing their interior composition because they are affected by the transport and thermo dynamic properties of dense matter such as neutrino emissivity\, viscosity and heat capacity which are very different for different phases. In this ta lk I will discuss how observations of spin frequency and temperature evolut ion of NSs can be used to probe their interior composition. I will describe how the oscillations of NSs can be potentially powerful probes of dense NS matter. I will present our results for upper limits on the amplitude of r- mode oscillations\, and their gravitational-radiation-induced spin-down rat es in low mass X-ray binary neutron stars. I will also give upper bounds on the gravitational wave amplitudes due to r-mode oscillations in these sour ces. LAST-MODIFIED:20230127T204526Z LOCATION:2202 Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081006T163000Z DTEND:20081006T173000Z DTSTAMP:20260828T094430Z UID:3ul4vdh75qdarcu2m89ss6eet4@google.com CREATED:20080912T171417Z DESCRIPTION:Speaker: Gretchen Campbell\, JILA\, University of Colorado and NIST\nTitle:"Probing quantum coherence and ultracold collisions with a 87-s trontium optical lattice clock"\n LAST-MODIFIED:20230127T204818Z LOCATION:Physics Building\, Room: 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121015T173000Z DTEND:20121015T190000Z DTSTAMP:20260828T094430Z UID:uq5o2o1glhjfijuhf62b35cvuo@google.com CREATED:20120921T211404Z DESCRIPTION:Title: "Evanescent Laws: Gravity evades energy conservation and eats entropy on the cosmological scale"\nSpeaker: Charles Misner \nInstitu tion: University of Maryland LAST-MODIFIED:20230127T205314Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Group Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091120T003000Z DTEND:20091120T023000Z DTSTAMP:20260828T094430Z UID:5mhoc8bf2mj6l806ocjljsuif0@google.com CREATED:20091106T182909Z DESCRIPTION:All are invited to the second\, bi-annual Physics Coffee House & Acoustic Open Mic Night\n\nIf you would like to perform a few songs for t he open mic\, please send email to Tom Gleason (tgleason@umd.edu) with open -mic in the subject line. Due to space and time constraints\, performances will be restricted to individuals and groups requiring minimal set-up. We will have a PA and two mics.\n LAST-MODIFIED:20230127T204945Z LOCATION:Toll Room (1204 PHY) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Coffee House & Acoustic Open Mic Night TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130314T180000Z DTEND:20130314T193000Z DTSTAMP:20260828T094430Z UID:ehvadgs260nerl9slqgt622qok@google.com CREATED:20130307T225149Z DESCRIPTION:Speaker: Subir Sachdev\, Harvard University\n\nTitle: Metals near the onset of antiferromagnets: instabilities to d-wave pairing and bon d order\n\nAbstract: The high temperature superconductors are all two-dime nsional metals near the onset of spin density wave order. It is believed th at such a metal has a superconducting instability induced by the formation of spin-singlet pairs of electrons\, with the pairing amplitude changing si gn between regions of the Fermi surface connected by the spin density wave ordering wavevector. I will present sign-problem-free quantum Monte Carlo r esults which establish the existence of such a superconducting state. I wil l also review arguments that such metals have an additional instability whi ch is nearly as strong: towards the onset of a modulated bond order. This i nstability is a consequence of an emergent "pseudospin" symmetry of the low energy theory. I will place these results in the context of recent experim ental results on YBCO.\n\nHost: Rick Greene LAST-MODIFIED:20230127T204036Z LOCATION:Phys Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100419T201500Z DTEND:20100419T213000Z DTSTAMP:20260828T094430Z UID:jmkhvrg1jrvkjhk54h7h0rihfg@google.com CREATED:20100408T133819Z DESCRIPTION:Title : A Multi-Point Perspective on the Solar Wind at a Small Scale\nSpeaker Name: Eileen Chollet\nSpeaker Institution : Caltech\nAbstrac t : While a broad-brush picture of the heliosphere is typically available f or space weather prediction\, key parameters can change significantly over a million-kilometer scale. In this presentation\, I will discuss the import ance of energetic particle predictions for space weather and delve into rec ent energetic particle transport modeling work which may substantially impr ove available predictions. Using joint data from the ACE\, Wind and STEREO spacecraft\, I will explore the limitations on these predictions created by sharp gradients in the energetic particle intensity. I will present the ph ysical properties of these gradients and their relationship to both large-s cale solar wind structures and turbulence. LAST-MODIFIED:20230127T205129Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090930T173000Z DTEND:20090930T190000Z DTSTAMP:20260828T094430Z UID:9v01hgso0j3n9tggarpehi8ieo@google.com CREATED:20090918T192001Z DESCRIPTION:Title : Missing Energy at the LHC: The Dark Matter Connection\n Speaker Name: Professor Tao Han\nSpeaker Institution : University of Wiscon sin\nNotes: This is the Elementary Particle Theory Seminar-Joint Seminar wi th Hopkins. Lunch will be served in Toll Room (1204) from 12:30pm.\nAbstrac t :One of the most challenging tasks in collider experiments is to determin e the mass of missing particles\, predicted in theories beyond the Standard Model\, which are often well-motivated cold dark matter candidates.After a recollection of the observations of missing energy events in high energy e xperiments\, we discuss the prospects of discovering new physics at the LHC with the large missing energy events\, and comment\non the difficulty for measuring the missing particle mass. We propose to search for a new class o f processes\, the "antler decay". The unique kinematics could allow for det ermination of the missing particle mass\, which would be an important piece of information to cross-check with the direct and indirect searches for da rk matter in astroparticle and cosmological experiments.\n LAST-MODIFIED:20230127T203952Z LOCATION:1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110217T163000Z DTEND:20110217T180000Z DTSTAMP:20260828T094430Z UID:g8a58p1gbut45rdt14oo1bb6s0@google.com CREATED:20110126T193516Z DESCRIPTION:SPEAKER: Daniel Phillips - Ohio Univ\, Athens \nTITLE: "Lo ok Mum! No pions! Addressing (some) nuclear-structure issues using 'pionles s' effective field theories"\nABSTRACT: Universal predictions for few-bod y quantum bound states emerge in the limit that the two-body scattering len gth\, a\, is much larger than the range of the interaction\, R: many differ ent few-body observables are correlated with the value of a. For few-nucleo n systems the effective field theory that implements the hierarchy of scale s R << a\, and hence encodes these universal results in a systematic way\, is the pionless effective field theory. In this talk I will first present a brief review of results obtained in the pionless EFT for systems up to A=4 \, and then apply its principles to two different problems in nuclear-struc ture physics. \n The first of these is the binding energy differenc e between Helium-3 and tritium. This is a fundamental nuclear-physics obser vable that constrains the extent of charge-symmetry breaking in the NN forc e. I will present a pionless EFT calculation of the model-independent corre lation between this binding-energy difference and the neutron-neutron scatt ering length\, and discuss the consequences of this result for a_{nn}.\n I will then turn to the one-neutron halo nucleus 11Be. This system ca n be examined within an EFT in which the degrees of freedom are the 10Be co re and a neutron. The 11Be nucleus has a shallow 1/2+ and a shallow 1/2- st ate\, and so an EFT involving both resonant s-wave and resonant p-wave inte ractions is needed to describe it. At leading order this EFT contains thre e parameters in the two-body sector\, all of which can be fixed using 11Be structure data. I will show the resultant EFT prediction for the dissociati on spectrum obtained from Coulomb excitation of the 11Be nucleus into 10Be plus a neutron\, and compare to recent experiments. This facilitates an ext raction of the s-wave scattering length and effective range and the p-wave scattering volume that parametrize the scattering of a neutron from a 10Be nucleus.\n\n LAST-MODIFIED:20230127T205230Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar (Different Day) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090513T193000Z DTEND:20090513T203000Z DTSTAMP:20260828T094430Z UID:09351e2etbi8vqaa6fciqlkogo@google.com CREATED:20090429T193605Z DESCRIPTION:Title: Nanostructures for Enhanced Light-Material Interactions: Fabrication and Performance\nSpeaker: Dr. Tim Corrigan LAST-MODIFIED:20230127T204925Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131024T200000Z DTEND:20131024T210000Z DTSTAMP:20260828T094430Z UID:80C5DEA2-D1EC-46A0-BC1D-7FC66E8D8759 CREATED:20131015T020957Z DESCRIPTION:Title : Bi-Directional Energy Cascades and the Origin of Kineti c Alfvenic and Whistler Turbulence in the Solar Wind\n\nSpeaker Name: Dr. H aihong Che\n\nSpeaker Institution : NASA/GSFC\n\nAbstract : The observed su b-proton scale turbulence spectrum in the solar wind raises the question of how that turbulence originates. Observations of keV energetic electrons du ring solar quite-time suggest them as possible source of free energy to dri ve the turbulence. Using particle-in-cell simulations\, we explore how free energy in energetic electrons\, released by an electron two-stream instabi lity drives Weibel-like electromagnetic waves that excite wave-wave interac tions. Consequently\, both kinetic Alfvenic and whistler waves are excited that evolve through inverse and forward magnetic energy cascades. LAST-MODIFIED:20230127T203940Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:6 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121004T163000Z DTEND:20121004T173000Z DTSTAMP:20260828T094430Z UID:j8h0dqp3vihi384og1ht06ucrg@google.com CREATED:20120928T131947Z DESCRIPTION:Title: Revival-echoes and localization of interacting wave pack ets in anharmonic potentials\nSpeaker: Mark Herrera\nUniversity of Marylan d\nDepartment of Physics LAST-MODIFIED:20230127T204452Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100324T160000Z DTEND:20100324T170000Z DTSTAMP:20260828T094430Z UID:var4qafeu98mmtqqmg39cs276c@google.com ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com;X-NUM-GUESTS=0:mailto:lb k660a75b8jh7ek6jr84jfue0@group.calendar.google.com CREATED:20100319T192757Z DESCRIPTION:Title : AppEl Seminar - Surface Enhanced Raman Spectroscopy\nSp eaker Name: Prof. Oded Rabin\nSpeaker Institution : IREAP\, ECE\, Universit y of Maryland\n LAST-MODIFIED:20230127T204102Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091207T213000Z DTEND:20091207T223000Z DTSTAMP:20260828T094430Z UID:7t2cnlqvap2g0t6c99615f81jg@google.com CREATED:20091006T131447Z DESCRIPTION:Title : Cosmic Ray Modulation over the Past 10\,000 Years\nSpea ker Name: Ken McCracken\nSpeaker Institution: IPST\, University of Maryland \n\nThe cosmogenic nuclides\, 10Be and 14C\, provide two independent recor ds of the cosmic ray intensity at Earth\, each stretching back >10\,000 yea rs. They exhibit several prominent and large amplitude periodicities\; the Hale (11/ 22yr)\; Gleissberg (~85yr): de Vries (208 yr)\; and Hallstatt (2 200 yr). In the period under study\, there have been twenty two “Grand Min ima” events in the cosmic ray intensity\, similar to those accompanying the Maunder (1645-1715) and Spoerer (1420-1540) minima. During these events\, the cosmic ray intensity at Earth has approached that of the local interst ellar spectrum. These features of the paleo-cosmic ray record will be discu ssed\, showing that the “instrumental era” has represented one of the more active intervals (but not most active) in the past 10\,000 yr. The until re cently poorly known Hallstatt (2200yr) periodicity will be discussed in som e detail\, showing that the “Grand Minima” events usually coincide with the Hallstatt minima\, !\n\nleading to the prediction that there may be no mor e deep Grand Minima for another 1000 years. The cosmogenic data have been u sed to estimate the strength of the interplanetary magnetic field throughou t the 10\,000 yr interval\, yielding 25 yr averages of ~1 nT during deep Gr and Minima\, and ~8nT during the maxima of the Hallstatt cycle. The solar i mplications will be discussed. Finally\, the understanding gained from the paleo-cosmic ray record will be used to discuss the significance of the cur rent “prolonged sunspot minimum”\, and the potential that it presents to pr ovide improved understanding of the heliospheric conditions in the past.\n Institution : IPST\, University of Maryland\nAbstract LAST-MODIFIED:20230127T204204Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121210T164500Z DTEND:20121210T173000Z DTSTAMP:20260828T094430Z UID:tlc7nqo25fdmnak8pq9306j1qg@google.com CREATED:20121204T161942Z LAST-MODIFIED:20230127T204046Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090218T190000Z DTEND:20090218T200000Z DTSTAMP:20260828T094430Z UID:78r263634e7tkphas1fcf2bimg@google.com CREATED:20090202T182552Z DESCRIPTION:Title: Binary Black Hole Simulations and Implicit Time-stepping \nSpeaker: Dr. Harald P. Pfeiffer\, Theoretical Astrophysics\, Caltech LAST-MODIFIED:20230127T204404Z LOCATION:CSIC Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100409T180000Z DTEND:20100409T190000Z DTSTAMP:20260828T094430Z UID:v99vgfus4shafgidr51r67lt58@google.com CREATED:20100407T163725Z DESCRIPTION:Speaker: Dr. Christopher Davis\nProfessor\, Department of Elect rical and Computer Engineering\nUniversity of Maryland \nTitle: Is the Radi ation from Your Cell Phone a Health Hazard? Risk vs. Reality\nABSTRACT:\nDe spite an overwhelming preponderance of evidence to the contrary\, there con tinues to be some public concern that human exposure to radio frequency (RF ) radiation from cell phones and base stations\, even at relatively low lev els\, can constitute a health hazard. The media seize on any report of a po ssible health risk based on occasional reports of biological effects being produced by RF radiation\, but ignore the much larger number of studies tha t find nothing. This talk will review the science underlying our understand ing of how RF radiation can interact with biological systems and discuss wh y public concern about the health risk from cell phones and base stations i s irrational. The claimed connection between cell phone use and cancer will be examined\, and some of the legal cases that have kept the cell phone he alth controversy alive. A specific interaction mechanism that will be discu ssed is the possibility of nonlinearity in cells and tissue that might demo dulate an RF carrier.\n\n LAST-MODIFIED:20230127T204608Z LOCATION:Jeong Kim Engineering Building\, Rm. 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Booz Allen Hamilton Distinguished Colloquium in Electrical and Computer Engineering TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090223T210000Z DTEND:20090223T220000Z DTSTAMP:20260828T094430Z UID:gauraure6gcvbh426vl0fstu8k@google.com CREATED:20090220T212350Z DESCRIPTION:Speaker: P. Leslie (Les) Dutton\, Professor\, Departments\n of Biochemistry and Biophysics\, University of \n Pennsylvania\nTitle: “Marcus and Eyring: Electron Tunneling in \n electron transfer chains and oxidoreductase \n catalysis” LAST-MODIFIED:20230127T204225Z LOCATION:IPST BUILDING 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090922T160000 DTEND;TZID=America/New_York:20090922T170000 DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com RECURRENCE-ID;TZID=America/New_York:20090922T160000 CREATED:20090819T165808Z DESCRIPTION:Speaker: Dr. Kate Kirby\, American Physical Society\n\nTitle: "TBA". LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090429T200000Z DTEND:20090429T210000Z DTSTAMP:20260828T094430Z UID:qddf95o75kklj53t9ev0q3n8g4@google.com CREATED:20090423T180254Z DESCRIPTION:Title: Propagation of high intensity optical/plasma filaments i n atmospheric quantum wakes\nSpeaker: Dr. Howard Milchberg\, University of Maryland LAST-MODIFIED:20230127T204358Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131031T133000 DTEND;TZID=America/New_York:20131031T143000 DTSTAMP:20260828T094430Z UID:pcgc6qai2rdvjsi5hf8uhsahpk@google.com RECURRENCE-ID;TZID=America/New_York:20131031T133000 CREATED:20130816T163136Z DESCRIPTION:Title: Large Nc gauge theory and chiral random matrix theory\n\ nSpeaker: Jong-Wan Lee\, CCNY\n\nAbstract: In this talk\, we will discuss how the 1/Nc expansion and the chiral random matrix theory can be used to s tudy the chiral symmetry breaking of large-Nc gauge theories. As a concrete example\, we numerically study the four dimensional SU(Nc) gauge theory wi th Nf = 2 heavy adjoint fermions\, introduced as the center symmetry preser ver keeping the infrared physics intact\, on a 2^4 lattice. By looking at t he low-lying eigenvalues of the Dirac operator for a massless probe fermion in the adjoint representation\, we find that the chiral symmetry is indeed broken with the expected breaking pattern. This result reproduces a well-k nown fact that the chiral symmetry is spontaneously broken in the pure SU(N c) gauge theory in the large-Nc and the large-volume limit\, and therefore supports the validity of the combined approach. We also provide the interpr etation of the gap and unexpected Nc-scaling\, both of which are observed i n the Dirac spectrum. LAST-MODIFIED:20230127T204526Z LOCATION:2202 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100305T180000Z DTEND:20100305T190000Z DTSTAMP:20260828T094430Z UID:7hp8tiu7l9c5bcjkkd2avjne1s@google.com CREATED:20100226T165630Z DESCRIPTION:Title: Thermodynamic Behavior and Electromechanical Properties of Ferroelectric Solid Solutions\n\nPresented by George Rossetti\nMaterials Science and Engineering Program\nChemical\, Materials and Biomolecular Eng ineering\nInstitute of Materials Science\nUniversity of Connecticut\n\nCera mics based on ferroelectric solid solutions find applications in a wide arr ay of dielectric\, electromechanical and electro-optic devices. In this tal k a theory is presented for the generic case of a ferroelectric solid solut ion wherein different symmetry phases are located at opposing ends of the i sobaric\, pseudo-binary composition-temperature phase diagram. Disparate ph ysical phenomena that may occur in such systems\, including tricritical beh avior\, the formation of nanodomain and polar glasslike ferroelectric state s\, and the appearance of two-phase equilibrium fields\, are reconciled thr ough a self-consistent application of the Landau theory of phase transition s\, the classical theory of domains\, and the Gibbs thermodynamics of solut ions. Drawing on selected examples from technologically important perovskit e-structured solid solution systems that include PZT [Pb(Zr1-xTix)O3]\, PMN -PT [Pb(Mg1/3Nb2/3)1-xTixO3]\, BST [(BaxSr1-x)TiO3] and BZT [Ba(Zr1-xTix)O3 ] interrelations between the polarization anisotropy energy\, the topology of the pseudo-binary phase diagram\, the ferroelectric-ferroelastic domain structure\, and the extrinsic contributions to the dielectric and piezoelec tric properties are demonstrated. The close qualitative analogies that exis t between the diffusionless composition-temperature phase diagrams of these systems and the pressure-temperature diagrams of the end member compounds are also illustrated. The implications of the theory for the control of mic rostructure and for the design of ferroelectric solid solution materials wi th controlled dielectric and electromechanical properties are discussed. LAST-MODIFIED:20230127T205231Z LOCATION:Room 2108 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090914T203000Z DTEND:20090914T213000Z DTSTAMP:20260828T094430Z UID:rfiejohc5282s94i7np3afprjg@google.com CREATED:20090908T201112Z DESCRIPTION:Title : A New Mechanism for the Generation of Anomalous Cosmic Rays\nSpeaker Name: James F. Drake\nSpeaker Institution : University of Mar yland\nAbstract : The recent observations of the anomalous cosmic ray (ACR) energy spectrum as Voyagers 1 and 2 crossed the heliospheric termination s hock have called into question the conventional shock source of these energ etic particles. We suggest that the sectored heliospheric magnetic field\, which results from the flapping of the heliospheric current sheet\, piles u p as it approaches the heliopause\, narrowing the current sheets that separ ate the sectors and triggering the onset of collisionless magnetic reconnec tion. Particle-in-cell simulations reveal that most of the magnetic energy goes into energetic ions with significant but smaller amounts of energy goi ng into electrons. The most energetic ions gain energy as they reflect from contracting magnetic islands\, a first order Fermi process. An analytic mo del is constructed in which the Fermi drive is balanced by convective loss. The ACR differential energy spectrum takes the form of a power law with a spectral index slightly a!\n\nbove 1.5. The model has the potential to expl ain several key ACR observations\, including the similarities in the spectr a of different ion species. Implications for flare ion acceleration will al so be discussed.\n LAST-MODIFIED:20230127T205214Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081006T190000Z DTEND:20081006T200000Z DTSTAMP:20260828T094430Z UID:o3c2928ebbl7h8dgl02ihs8uv4@google.com CREATED:20081006T141332Z DESCRIPTION:Speaker: Mildred Dresselhaus\nTitle: "Remarkable Nanostructured Forms of Carbon"\nMore Information: Sheryl Ehrman\, ChBE\, 301 405 1917\, sehrman@umd.edu\n LAST-MODIFIED:20230127T204357Z LOCATION:JM Patterson 3201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nanocolloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111024T200000Z DTEND:20111024T210000Z DTSTAMP:20260828T094430Z UID:nheat1v5kj5rsds5o523n4dsto@google.com CREATED:20111017T143909Z DESCRIPTION:Title : Intrinsically Disordered Proteins\, Polymer Brushed and the Nuclear Pore Complex: Implications for a Novel form of Gated Transport .\nSpeaker Name: Dr. Ajay Gopinathan\nSpeaker Institution : University of C alifornia\, Merced LAST-MODIFIED:20230127T204512Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090408T200000Z DTEND:20090408T210000Z DTSTAMP:20260828T094430Z UID:kdn9kob7qhund8s65u61l1rtj4@google.com CREATED:20090331T202018Z DESCRIPTION:Title: Observation of plasma convection and transport in the Le vitated Dipole Experiment\nSpeaker: Dr. Darren Garnier\, MIT LAST-MODIFIED:20230127T204221Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090212T203000Z DTEND:20090212T223000Z DTSTAMP:20260828T094430Z UID:qv5o39uuup829bau9qoi5bvigg@google.com CREATED:20090202T175015Z DESCRIPTION:Title: Thermodynamics of towers and the liftability problem \nS peaker: Yakov Pesin\, Penn State LAST-MODIFIED:20230127T205025Z LOCATION:Math Building\, Room 1311 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dynamical Systems Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101215T200000Z DTEND:20101215T210000Z DTSTAMP:20260828T094430Z UID:a9718672h1mhqu4j7b7cpj0ed8@google.com CREATED:20101214T162412Z DESCRIPTION:[Title] “Metaphor for dark energy”\n[Speaker] Prof. Raman Sundr um\n[Institution] University of Maryland\n[Abstract] I introduce scalar gra vity in modern form as an intriguing analog of general relativity\, capturi ng the equivalence principle\, curved spacetime\, non-renormalizability\, U V \ncompletion\, and the cosmological constant problem. I describe a soluti on to this problem involving a theoretically well-controlled and motivated "modified gravity"\, paying close attention to cosmology and initial condit ions. I show that in this way\, the cosmological constant is necessarily tr ansformed into a dynamical and testable "dark energy". I am happy to discus s the implications as I understand them for real general relativity and exp eriments aimed at dark energy. LAST-MODIFIED:20230127T205245Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Sminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090213T180000Z DTEND:20090213T190000Z DTSTAMP:20260828T094430Z UID:qp1f87eqt0fi28fsoqmu24j54c@google.com CREATED:20090211T193145Z DESCRIPTION:Title: Quantum Networking with Semiconductor Quantum Dots\nSpea ker: Professor Edo Waks\, University of Maryland LAST-MODIFIED:20230127T204029Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120315T163000Z DTEND:20120315T173000Z DTSTAMP:20260828T094430Z UID:8mpdjcriepo89rt7tj7npeqvo8@google.com CREATED:20120307T210248Z DESCRIPTION:Canceled LAST-MODIFIED:20230127T204720Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Canceled: Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091202T200000Z DTEND:20091202T210000Z DTSTAMP:20260828T094430Z UID:vrrtjqf0ss3pt2ite1mc4o4m5c@google.com CREATED:20091130T153407Z DESCRIPTION:Title: Optical receivers for digital communication with very we ak signals\nBy: Julius Goldhar\nDepartment of Electrical and Computer Engin eering\nUniversity of Maryland\n \nAbstract: \nIn theory\, it has been kno wn for decades that it is possible to perform optical measurements such tha t the error rate approaches the Helstrom bound\, which can be significantly below the shot noise limit. The theoretical implementation of a "measureme nt" means finding an appropriate set of mathematical operators\, but this i s not very helpful to an experimentalist. There have been some proposed sch emes to experimentally beat the shot noise limit for specific modulation sc hemes\, such as the Dolinar receiver for binary modulation\; most of the co ncepts proposed in the past were quite impractical. This talk will review t he theory and discuss some practical techniques for implementing optimal op tical receivers for communications at high bit rates and low photon numbers . LAST-MODIFIED:20230127T205211Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Gree nmead Dr.\, College Park\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Laboratory for Physical Sciences Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101101T201500Z DTEND:20101101T213000Z DTSTAMP:20260828T094430Z UID:6ss7d4lj2gvoq1rkr62lvsk2h4@google.com CREATED:20101019T171114Z DESCRIPTION:Title : Low-energy Charged Particles at Voyagers 1 and 2 in the Heliosheath\nSpeaker Name: Robert Decker\nSpeaker Institution : Johns Hopk ins University Applied Physics Laboratory\nNotes: Coffee\, Tea & Cookies 4: 15-4:30 PM\nAbstract : Voyager 1 (115 AU\, N34 deg.) and Voyager 2 (93 AU\, S29 deg.) have been in the heliosheath since Dec. 2004 and Sep. 2007\, res pectively. Intensities of low-energy ions 40 keV - few MeV measured by the LECP instrument on Voyager 1 have been relatively steady since mid-2006. Th e heliosheath-averaged (5.6-year) Voyager 1 energy spectrum rolls over slig htly with increasing energy\, with the spectral index changing from -1.5 to -1.7. Intensities of ions 30 keV - few MeV observed by the LECP instrument on Voyager 2 have been relatively steady since 2009.4\, in contrast to the large quasi-recurrent variations observed from 2007.66 (termination shock) to 2009.4. The low-energy ion energy spectrum at Voyager 2 is slightly har der than that at Voyager 1. The Voyager 2 spectrum averaged over 2007.66-20 09.4 shows a rollover\, with the spectral index changing from -1.3 to -1.5. Intensities of energetic (0.02-1.5 MeV) heliosheath electrons began decrea sing exponentially at Voyager 2 on 2009.15\, and are now at detection backg round. Energetic electron intensities at Voyager 1 remain high. We estimate the heliosheath plasma flow velocity in the R-T (LECP instrument scan) pla ne at Voyager 1 by using angular data from the three lowest energy ion chan nels that cover 40-139 keV. LECP cannot measure the normal component of flo w WN. During 2007.7-2010.7\, the estimated radial component of flow WR decr eased from ~ 60 km/s to ~ 0 km/s at a rate of -20 km/s/yr. On average\, the tangential component of flow WT has been ~ -40 km/s from termination shock crossing onward\, but continues to show broad variations ±20 km/s. LAST-MODIFIED:20230127T204850Z LOCATION:Computer & Space Science Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081105T203000Z DTEND:20081105T213000Z DTSTAMP:20260828T094430Z UID:klhlse4fn2qpdp41v39nc672mo@google.com CREATED:20081016T175803Z DESCRIPTION:Title: Quantum Cascade Lasers: Design\, Growth\, Fabrication\, Characterization\, and Applications\nSpeaker: Professor Fow-Sen Choa\, Univ ersity of Maryland Baltimore County LAST-MODIFIED:20230127T203941Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:1 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130529T190000Z DTEND:20130529T203000Z DTSTAMP:20260828T094430Z UID:86vfibssbkspljlol67rop0tnk@google.com CREATED:20130524T174138Z DESCRIPTION:Title: Reactor Neutrinos and the Double Chooz Experiment\n\nSpe aker Name: Dr. John W. Felde\n\nSpeaker Institution : University of Califor nia\, Davis\n\nAbstract : Indications of a non-zero oscillation amplitude\, consistent with theta_13\, were borne out by the recent results from three reactor neutrino experiments: Double Chooz\, Daya Bay\, and RENO. Using th e Double Chooz experiment as an example\, I will describe how these experim ents measured the last unknown mixing parameter. Particular attention will be payed to the calibration efforts and oscillation analysis for Double Cho oz. Finally\, I will also put the measured value into context for future ex periments. LAST-MODIFIED:20230127T204045Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081110T210000Z DTEND:20081110T220000Z DTSTAMP:20260828T094430Z UID:ftfv4flnijrh3g31ecmdtj22q4@google.com CREATED:20081105T183433Z DESCRIPTION:Title: Road Signs for Kinesin Motors\nSpeaker: Professor Kriste n J. Verhey\, Department of Cell and Developmental Biology\, University of Michigan Medical School\, Ann Arbor\, Michigan\nMore Speaker: Contact Dr. T hirumalai\, Coordinator LAST-MODIFIED:20230127T204249Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130419T130000 DTEND;TZID=America/New_York:20130419T140000 DTSTAMP:20260828T094430Z UID:63vbbgdpk77qe40rjng87laic4@google.com RECURRENCE-ID;TZID=America/New_York:20130419T130000 CREATED:20130108T151219Z DESCRIPTION:Title : Alternative Fuels and the Role of Scientists and Engine ers in Policy Analysis\n\nSpeaker Name: James T. Bartis\n\nSpeaker Institut ion : Massachusetts Institute of Technology\n\nAbstract : Scientists and en gineers have made important contributions to both energy and national defen se policy. This lecture will introduce the field of policy research using\, as a case study\, a recent and highly controversial analysis of "Alternati ve Fuels for Military Applications." This research was called for by the U. S. Congress and undertaken by the RAND Corporation. LAST-MODIFIED:20230127T204752Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131120T133000 DTEND;TZID=America/New_York:20131120T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20131120T133000 CREATED:20130816T163032Z DESCRIPTION:Title: David Defeats Goliath: How Ultralight Fields Affect The Dynamics of Massive Black Holes\n\nSpeaker: Paolo Pani\, Harvard-Smithsonia n Center for Astrophysics\n\nAbstract: In the last few years several intere sting phenomena associated to the\ninteraction between massive black holes and fundamental bosonic fields\nhave been discovered. I present a selection of them\, including\nsuperradiance instabilities of spin-0\, spin-1 and sp in-2 fields\,\nfloating orbits in extreme-mass ratio inspirals and black-ho le\nspontaneous scalarization. The theoretical potential of these effects\n as almost-model-independent smoking guns for exotic particles and\nmodified gravity\, as well as their limitations in realistic\nastrophysical scenari os\, are discussed. LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120221T190000Z DTEND:20120221T203000Z DTSTAMP:20260828T094430Z UID:u2on6i1jpd3jiklbs20ssdaems@google.com CREATED:20120214T155949Z DESCRIPTION:Title : Searching for new physics with the LHC in final states with two same-sign charge leptons\nSpeaker Name: Vyacheslav Krutelyov\nSpea ker Institution : University of California\, Santa Barbara\nAbstract : The Large Hadron Collider has delivered proton-proton collisions at a center of mass energy of 7 TeV since 2010. This data was used to expand our understa nding of the Standard Model of\nthe particle physics and to search for evid ence of new physics processes. Final states with two isolated leptons of th e same charge\, hadronic jets\, and missing energy are rare in the Standard Model and provide sensitivity to a range of new physics models\, among whi ch is a Supersymmetry. I review recent progress in searches for physics bey ond the Standard Model\nin these final states performed at the CMS detector . LAST-MODIFIED:20230127T205213Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090415T193000Z DTEND:20090415T203000Z DTSTAMP:20260828T094430Z UID:qa7122etcpl907apda0016jn40@google.com CREATED:20090325T190728Z DESCRIPTION:Title: Magnetometry\, the MEMS Flux Concentrator\, and Related Applications\nSpeaker: Dr. Alan Edelstein\, Army Research Lab LAST-MODIFIED:20230127T205213Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090310T171500Z DTEND:20090310T181500Z DTSTAMP:20260828T094430Z UID:9d4f7csitego7q36obsirlsp8k@google.com CREATED:20090304T183323Z DESCRIPTION:Title: Polymerization and Mechanochemical Action of Dynamin\nSp eaker: Martin Lenz\, Laboratoire Physico-Chimie Curie\nMore Information: As in the past\, each seminar will be preceded by an Informal Cafeteria Lunch to which all are welcome\, departing from Room 1108 about five minutes aft er 12:00(Noon).\n\nContact:\nProfessor Christopher Jarzynski\, cjarzyns@umd .edu\, (301)405-4439\nProfessor John Weeks\, jdw@umd.edu\, (301)405-4802 LAST-MODIFIED:20230127T204950Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110223T163000Z DTEND:20110223T180000Z DTSTAMP:20260828T094430Z UID:c2d114emohdgkdgik02hdmn3ro@google.com CREATED:00010101T000000Z DESCRIPTION:No Nuclear Physics Seminar today. LAST-MODIFIED:20230127T205227Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090210T160000 DTEND;TZID=America/New_York:20090210T170000 DTSTAMP:20260828T094430Z UID:oiherbvqgudjapqso6ocvvvkmc@google.com RECURRENCE-ID;TZID=America/New_York:20090210T160000 CREATED:20090126T164931Z DESCRIPTION:Speaker: Elizabeth Hays\, NASA Goddard Space Flight Center\nTit le: The Fermi Gamma-Ray Space Telescope at Six Months LAST-MODIFIED:20230127T204241Z LOCATION:Physics Building\, Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090828T123000Z DTEND:20090828T163000Z DTSTAMP:20260828T094430Z UID:8c0ok0a19f7hv7inb37a14836k@google.com CREATED:20090824T141315Z DESCRIPTION:Organizers: Cole Miller\, Chris Reynolds\, Manuel Tiglio\nFor m ore information\, visit: www.cscamm.umd.edu/programs/fsg09/\n LAST-MODIFIED:20230127T205005Z LOCATION:CSIC Building\, Seminar Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Matter & Electromagnetic Fields in Strong Gravity Workshop (8/24-8/ 28) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20131126T181500Z DTEND:20131126T193000Z DTSTAMP:20260828T094430Z UID:3sbakp5n4ad9vjqlcbvfng62e0@google.com CREATED:20131118T151107Z DESCRIPTION:Title : Global Income Inequality: Current Trends and Future Pro spects.\n\nSpeaker Name: Dr. Branko Milanovic\n\nSpeaker Institution : Worl d Bank (Research Department)\n\n LAST-MODIFIED:20230127T205020Z LOCATION:Room 1116 IPST Building\, Bldg 85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100414T163000Z DTEND:20100414T173000Z DTSTAMP:20260828T094430Z UID:sc1hkl16fnoapns2blblc9k6vg@google.com CREATED:20100223T205156Z DESCRIPTION:SPEAKER: Andre Walker-Loud\n\nAFFILIATION: College of William & Mary\, Williamsburg VA\n\nTITLE: A Direct Lattice Calculation of the S trong Isospin Breaking Parameter\, m_d – m_u LAST-MODIFIED:20230127T204406Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20130924T163000Z DTEND:20130924T190000Z DTSTAMP:20260828T094430Z UID:cnftmjd0es0rtor7hm5jg57lqo@google.com CREATED:20130822T164227Z DESCRIPTION:Lunch at 12:30pm in Toll Room (1305F)\, talk to follow at 2 pm in Toll Room (1305F)\nSpeaker: Rick Van Kooten (Indiana U. and ATLAS collab oration)\nTopic: Present and Future Higgs(es)\n\nAbstract: Following the di scovery of a Higgs boson state at 125 GeV in various\ndecay modes\, we now enter a new program of measuring the properties of\nthis (and any other Hig gs bosons) with the best precision possible. The\ncurrent state of such mea surements will be summarized\, and prospects for\nfuture measurements at LH C upgrades as well as future lepton and hadron\ncolliders presented. The pr esentation will draw upon the report and\nconclusions from the Higgs Workin g Group prepared as a summary of input\nto the Community Summer Study 2013 ("Snowmass 2013"). LAST-MODIFIED:20230127T204544Z LOCATION:Toll Room 1305 F SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint High-Energy Seminar with Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100913T163000Z DTEND:20100913T173000Z DTSTAMP:20260828T094430Z UID:sj7s5rlj2m4q6ip8nvjupk44s0@google.com CREATED:20100825T185132Z DESCRIPTION:Title: Splitting\, Rocking and Blinding Single Atoms\nSpeaker: Dieter Meschede\, Institute for Applied Physics\, Universitat Bonn\nAbstrac t: The wave properties of material particles are one of the most widely kno wn features of quantum physics. Wave properties become apparent in diffract ion and most strikingly in interference phenomena. The microscope image (Fi g. 1 ) shows a coherently split single atom. I will discuss the necessary t ools to realize this non- local situation: Tools for trapping\, selectively addressing and transporting individual atoms\, for storing and retrieving information from the atomic qubits. We have studied matter wave interferenc es at the single trapped atom level. With multiple interferences the quantu m analogue of Brownian motion\, the quantum walk\, a concept of relevance i n quantum information science\, was demonstrated. We have furthermore obtai ned excellent control of atomic motion using microwaves\, including cooling to the vibrational ground levels and the creation of single particle entan gled states. In a separate line of experiments we have been able to read ou t the spin quantum states of individual atoms by dispersive methods. I will discuss the options to create correlated many atom quantum states based on the known protocols. LAST-MODIFIED:20230127T204812Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110210T150000Z DTEND:20110210T160000Z DTSTAMP:20260828T094430Z UID:v7n3733kc2bpceeg6q7btqbhos@google.com CREATED:20110203T185942Z DESCRIPTION:Title : Probing quantum systems through adiabatic dynamics\nSpe aker Name: Claudia deGrandi\nSpeaker Institution : Boston University\nAbstr act : We analyze the response of a quantum system when perturbed from its q uantum critical point. In particular we consider the case of quenches with arbitrary power law dependence on time of the tuning parameter. Using adiab atic perturbation theory we find the scaling behaviour of several observabl es with the quench amplitude and the system size. We show that the universa l scalings of those observables\, as the excitation probability\, the densi ty of excited quasiparticles\, the heat and the entropy\, can be understood through the singularities at the critical point of some adiabatic suscepti bilities\, which aredefined as a simple generalization of the fidelity susc eptibility. We specify those results to the case of the sine-Gordon model\, showing its connections to experimental \nrealizations with cold atoms in one-dimension. In particular we discuss the relevance of these\nfindings fo r the choice of the optimal protocol to load atoms in optical lattices.\nT itle of Event: CMTC seminar LAST-MODIFIED:20230127T204208Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20091117T160000 DTEND;TZID=America/New_York:20091117T170000 DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com RECURRENCE-ID;TZID=America/New_York:20091117T160000 CREATED:20090819T165808Z DESCRIPTION:Speaker: Prof. Katherine Freese\, University of Michigan: \n\nT itle: "Dark\nmatter in the universe". LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120315T173000Z DTEND:20120315T180000Z DTSTAMP:20260828T094430Z UID:hqhtpuc4hfcf3778gt6j6o417c@google.com CREATED:20120118T180912Z LAST-MODIFIED:20230127T204038Z LOCATION:Rm 1305 (the new Toll Rm) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081105T190000Z DTEND:20081105T200000Z DTSTAMP:20260828T094430Z UID:efpbn77qmgr3lhlockjsc1u3dg@google.com CREATED:20081015T155735Z DESCRIPTION:Title: Numerical techniques for accretion flows around black ho les\nSpeaker: Burkhard Zink\, LSU\nMore Information: http://www.cscamm.umd. edu/seminars/fall08/index.htm\, tiglio@umd.edu LAST-MODIFIED:20230127T204938Z LOCATION:CSIS Building\, Room 4122 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CSCAMM Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090305T190000Z DTEND:20090305T200000Z DTSTAMP:20260828T094430Z UID:akl37fod7fjs9e7du0n5rs3cjk@google.com CREATED:20090202T164003Z DESCRIPTION:Title: The superfluid Fermi liquid in a unitary regime\nSpeaker : Lev Pitaevskii LAST-MODIFIED:20230127T204229Z LOCATION:NIST in Lecture Rm. B SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nanokelvin Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130501T200000Z DTEND:20130501T213000Z DTSTAMP:20260828T094430Z UID:6h22uvirl97vn5p7lc4dthdllo@google.com CREATED:20130208T160834Z DESCRIPTION:Title : "The New Muon g-2 Experiment at Fermilab"\n\nSpeaker Na me: Dr. Adam Lyon\n\nSpeaker Institution : Fermilab\n\nAbstract : The anoma lous magnetic moment of the muon is a direct window to new physics and has been the subject of nuclear and particle physics experiments for the past 6 0 years. It drives both theory and experiment to new levels of precision an d sensitivity. The latest result in this enterprise is from the 1999-2001 run of the Brookhaven E821 experiment. With 0.54 parts per million (PPM) p recision\, it differs from the Standard Model prediction by more than 3 sig ma – enough to be extremely intriguing\, but not conclusive. By moving the main apparatus\, a 50 foot diameter superconducting storage ring\, from Br ookhaven to Fermilab\, the experiment will be repeated with a much more int ense and cleaner beam and all new detectors. The outcome will be a factor o f four improvement in precision reaching 0.14 ppm. If the difference betwee n experiment and the Standard Model seen at E821 persists\, the discrepancy will be greater than 5 sigma and possibly greater than 7 sigma if the theo retical prediction improves as expected. Such a result would be an undenia ble signal of new physics. I will present the past\, present\, and future aspects of Muon g-2 measurement and give details on the experiment’s new ho me at the Fermilab Muon Campus. LAST-MODIFIED:20230127T204317Z LOCATION: 1201 Physics SEQUENCE:7 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100914T180000Z DTEND:20100914T191500Z DTSTAMP:20260828T094430Z UID:pp60fn8101q1a1bnbne0m5i4dk@google.com CREATED:20100907T125354Z DESCRIPTION:Title : Velocity Fluctuations in Laminar Fluid Flow\nSpeaker Na me: Professor Jan Sengers\nSpeaker Institution : University of Maryland\, I PST Department\nNotes: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, departing from Room 11 08 above five minutes after 12:00 (Noon).\n LAST-MODIFIED:20230127T204641Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:6 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121121T193000Z DTEND:20121121T203000Z DTSTAMP:20260828T094430Z UID:0lvje1vrvpf7fadgf85223hi3c@google.com CREATED:20121015T152846Z DESCRIPTION:SPEAKER: Xiangdong Ji - TQHN\nTITLE: The nucleon spin on the light-front frame\nABSTRACT: TBA\n LAST-MODIFIED:20230127T204101Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CANCELLED: Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110222T190000Z DTEND:20110222T200000Z DTSTAMP:20260828T094430Z UID:81t5stdas0gjmrlqd3c36iv578@google.com CREATED:20110215T160721Z DESCRIPTION:Title : Optimal Control of Nonlinear Optical Instabilities in P lasmas Using STUD Pulses\nSpeaker Name: Dr. Bedros Afeyan\nSpeaker Institut ion : Polymath Research\, Inc.\nAbstract : If Spike Trains of Uneven Durati on and Delay\, or STUD pulses are used instead of continuous illumination o f the plasma\, and the laser pulses become ``on'' for a few inverse growth rates of the fastest instabilities\, with comparable delays between the spi kes\, then we can show that due to a variety of favorable\nmechanisms\, coh erent wave-wave interaction caused instabilities can be kept under\ncontrol . Their growth can be kept linear and unable to turn into runaway processes as they often are in current plasmas\, such as Raman scattering on the NIF . In addition\, STUD pulses allow the actual true control of crossed beam\n energy transfer whenever it is desired and its stoppage when it is not desi rable. This is achieved by temporal interleaving the pulse trains between cones of beams in indirect drive and in a spatially random subset of overla pping beams in direct drive.\n LAST-MODIFIED:20230127T205122Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121127T210000Z DTEND:20121127T220000Z DTSTAMP:20260828T094430Z UID:t7oss69bl40la2ieslq2jjh8fc@google.com CREATED:20121120T140850Z DESCRIPTION:Title: Precision Measurements of the Hubble Constant and PASS\n Speaker: Adam Riess\, Johns Hopkins University\nAstrophysics\nAbstract: The Hubble constant remains one of the most important parameters\nin the cosmo logical model\,\nsetting the size and age scales of the Universe. Present uncertainties in\nthe cosmological model\nincluding the nature of dark ener gy\, the properties of neutrinos and the\nscale of departures from\nflat ge ometry can be constrained by measurements of the Hubble constant\nmade to h igher precision\nthan was possible with the first generations of Hubble Tel escope\ninstruments. Streamlined distances ladders constructed from\ninfra red observations of Cepheids and type Ia supernovae with ruthless\nattentio n paid to systematics now provide\n3.5% precision and offer the means to do much better. While WFC3 has\nhelped open this new route\,\nits full explo itation can come from a new technique\, Parallel Astrometric\nSpatial Scann ing (PASS)\, to measure parallax distances beyond a kiloparsec.\nI will rev iew recent and expected progress. LAST-MODIFIED:20230127T204453Z LOCATION:PHYS 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130903T150000Z DTEND:20130903T163000Z DTSTAMP:20260828T094430Z UID:mgn17imdmmq1rashrvk0ubjli0@google.com CREATED:20130826T183708Z DESCRIPTION:Title : The nature of the quantum spin-liquid state in Herberts mithite\n\nSpeaker Name: Matthias Punk\n\nSpeaker Institution : Harvard\n\n Notes: For more seminars see:\nhttp://www.physics.umd.edu/cmtc/seminars.htm l\n\nAbstract : Recent neutron scattering experiments on the layered spin-1 /2 kagome lattice antiferromagnet Herbertsmithite revealed the first signat ure of fractionalized excitations in a quantum spin liquid state. The preci se nature of this state remains unclear\, however. Indeed\, mean-field mode ls of gapped as well as gapless spin liquids exhibit sharp features in the dynamic structure factor\, none of which have been observed in experiment.\ n\nIn this talk I'm going to show that several of the experimentally observ ed details can be explained by the presence of topological vortex excitatio ns in a gapped Z2 spin liquid. These so called vison excitations form almos t flat bands on the kagome lattice and act as a momentum sink for the spin- carrying excitations probed by neutron scattering. LAST-MODIFIED:20230127T203939Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20120412 DTEND;VALUE=DATE:20120413 DTSTAMP:20260828T094430Z UID:571qj4hnfrj2hg3crqsdrp7sok@google.com CREATED:20120406T150307Z DESCRIPTION:http://www.umer.umd.edu/events_folder/uBi12/ LAST-MODIFIED:20230127T203959Z LOCATION:A.V. Williams Building\, Rm. 1146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:4th Microbunching Instability Workshop TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110915T163000Z DTEND:20110915T173000Z DTSTAMP:20260828T094430Z UID:u9qrjj3rkbmj1m8va4v9gpha9g@google.com CREATED:20110912T122827Z DESCRIPTION:Title: The Dynamics of Spreading over a Dissolving Surface\nSpe aker: Dr. James Warren\, Thermodynamics and Kinetics Group\, University of Maryland LAST-MODIFIED:20230127T204028Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:UMD Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130307T183000Z DTEND:20130307T190000Z DTSTAMP:20260828T094430Z UID:sf9hekslf3m7vld0j01f5qfli0@google.com CREATED:20130301T030158Z LAST-MODIFIED:20230127T203948Z LOCATION:Phys Rm 1305F\, the "new" Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20111129 DTEND;VALUE=DATE:20111202 DTSTAMP:20260828T094430Z UID:dfvpo6k0majp1e118gho750cqg@google.com CREATED:20111128T153121Z DESCRIPTION:"Near Field Cosmology as a Probe of Early Universe\, Dark Matte r and Gravity"\n\nSCIENTIFIC RATIONALE\n\nOne of the unsolved puzzles in mo dern Astrophysics is the understanding the early nonlinear evolution of the Universe\, thus structure and galaxy formation at small scales (dwarf gala xies and smaller mass scales). Understanding the clumping of dark matter at these small scales is important for direct and indirect detections of dark matter particles and to test models on the nature of the dark matter and g ravity. For instance\, whether dark matter is made of cold or warm particle s or is a manifestation of modified gravity at small mass scales. Different test are available to probe the smallest clumps of dark matter ranging fro m lensing effects to dark matter annihilation signatures to the detection o f ultra-faint galaxies or dark galaxies in the Local Group. In addition\, o bservations of rotation curves and the velocity dispersion of stars in dwar f Spheroidal galaxies still pose some challenges to cold dark matter cosmol ogy. What is the mass number and properties of the dwarf galaxies that firs t formed in the universe and reionization feedback is also a related and un solved important question. Understanding galaxy formation in small halos re quires deeper insights on the physics behind stellar and black holes feedba ck and cosmic reionization. Surveys and detailed studies of the faint and u ltra-faint dwarf galaxies in the Local Group and deep 21cm surveys are powe rful probes of dark matter clumping at small scales and a test for models o f the formation of the fist galaxies.\n\nSessions will be organized around broad topics:\n• Session I: Particle physics theory: dark matter (DM) candi dates\n• Session II: Direct detection predictions and experiments\n• Sessio n III: Indirect dark matter detection: DM annihilation and decay\n• Session IV: Formation of the first dark and luminous structures and feedback proce sses\n• Session V: Near Field Cosmology (theory): Milky Way satellites\, as trophysical tests of Cold DM and gravity\n• Session VI: Near Field Cosmolog y (observations): ultra-faint satellites\, gravitational lensing\, 21 cm su rveys\n\nEach session will be anchored by two invited speakers -- experts i n their fields who can communicate well with an audience of observers and t heorists with a range of specialties. Invited speakers will have 30-35 min utes\, plus 5 minutes for questions/discussion. A few 15-20 minute contribu ted talks will round out each session. Other attendees will be able to brin g posters for display and discussion during coffee breaks\, which will be l ong to provide ample time for informal interactions.\n\nInvited speakers wi ll include: Howard Baer (Oklahoma)\, Volker Bromm (Texas)\, Juan Collar (C hicago)\, Marla Geha (Yale)\, Nick Gnedin (Fermilab/Chicago)\, Carter Hall (Maryland)\, Michael Kuhlen (UC Berkeley)\, Jerry Ostriker (Princeton)\, J oe Silk (Oxford\, UK)\, Tracy Slatyer (IAS)\, Tommaso Treu (UCSB)\, Mark Vo gelsberger (CfA\, Harvard)\, HongSheng Zhao (St. Andrews\, UK)\, and Kathry n Zurek (Michigan).\n LAST-MODIFIED:20230127T205140Z LOCATION:Loews Annapolis Hotel\, Annapolis\, MD SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Workshop TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090421T160000 DTEND;TZID=America/New_York:20090421T170000 DTSTAMP:20260828T094430Z UID:oiherbvqgudjapqso6ocvvvkmc@google.com RECURRENCE-ID;TZID=America/New_York:20090421T160000 CREATED:20090126T164931Z DESCRIPTION:Speaker: Francis Everitt\, Stanford University\nTitle: Frame-Dr agging\, Cryogenics\, and Space: Progress on the Gravity Probe B Mission LAST-MODIFIED:20230127T204241Z LOCATION:Physics Building\, Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081103T213000Z DTEND:20081103T223000Z DTSTAMP:20260828T094430Z UID:aveh35skderacbfhq53ts2ujao@google.com CREATED:20080915T190325Z DESCRIPTION:Speaker:Peter Yoon\, University of Maryland\nTitle:Toward a ful ly kinetic theory of solar wind turbulence\nWeb site:http://space.umd.edu:8 080/\nMore Information\, contact John Paquette\n(See paquette@umtof.umd.edu )\n LAST-MODIFIED:20230127T205105Z LOCATION:Computer and Space Sciences\, Room: 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090504T203000Z DTEND:20090504T213000Z DTSTAMP:20260828T094430Z UID:11ol2ajb6t7kilmr4jtu1jnn5c@google.com CREATED:20090429T193202Z DESCRIPTION:Title: THEMIS and Substorms\nSpeaker: David G Sibeck\, Goddard Space Flight Center LAST-MODIFIED:20230127T203932Z LOCATION:CSS Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131113T133000 DTEND;TZID=America/New_York:20131113T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20131113T133000 CREATED:20130816T163032Z DESCRIPTION:Title: Three Body Mechanics and The Origin of Retrograde Hot Ju piters\n\nSpeaker: Smadar Naoz\, Harvard-Smithsonian Center for Astrophysic s\n\nAbstract: I will be taking about recent new developments in the secula r\nhierarchical three body approximation\nand will mention a few applicatio ns.\n\nThe search for extra-solar planets has led to the surprising discove ry\nof many Jupiter-like planets in very close proximity to their host\nsta r\, the so-called ``hot Jupiters'' (HJs). Even more surprising\, many\nof t hese HJs have orbits that are eccentric or highly inclined with\nrespect to the equator of the star\, and some (about 25%) even orbiting\ncounter to t he spin direction of the star. This poses a unique\nchallenge to all planet formation models. We show that secular\ninteractions between Jupiter-like planet and another perturber in the\nsystem can easily produce retrograde H J orbits. We show that in the\nframe of work of secular hierarchical triple system (the so-called\nKozai mechanism) the inner orbit's angular momentum component parallel\nto the total angular momentum (i.e.\, the z-component of the inner\norbit angular momentum) need not be constant. In fact\, it ca n even\nchange sign\, leading to a retrograde orbit. A brief excursion to v ery\nhigh eccentricity during the chaotic evolution of the inner orbit\nall ows planet- star tidal interactions to rapidly circularize that\norbit\, de coupling the planets and forming a retrograde hot Jupiter.\nWe estimate the relative frequencies of retrograde orbits and counter to\nthe stellar spin orbits and find that the they are consistent with the\nobservations. LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101029T170000Z DTEND:20101029T180000Z DTSTAMP:20260828T094430Z UID:l5r479lkasb04eenlo6tk7fi0k@google.com CREATED:20101008T185532Z DESCRIPTION:Title : L12 and L10 Ordering Revisited Using the Generalized Br agg-Williams Model: Second Nearest-Neighbor Interactions/Spinodal Decomposi tion/Elastic Relaxation/Third Law\nSpeaker Name: William Soffa\nSpeaker Ins titution : University of Virginia\nAbstract : A generalized Bragg-Williams model incorporating first and second nearest-neighbor interactions is emplo yed to re-visit issues related to L12 and L10 ordering in FCC solid solutio ns. The computational thermodynamics approach addresses quantitatively the interplay of ordering and clustering in the solution energetics governing t he diffusional pathways leading to the precipitation of an ordered phase(L1 2) within a supersaturated FCC solution showing a marked impact of the high er (second) order interactions on microstructural evolution. In the case of L10 ordering the effects of elastic relaxation accompanying the cubic→tetr agonal transformation are shown to change the thermodynamic order( Ehrenfes t ) of the phase transition including the emergence of tricritical behavior at low temperatures. Also\, in examining the (A1)→ tetragonal (L10) transf ormation the concept of pseudospinodal decomposition arising in recent stud ies of the Fe-Pd system will be discussed brief\n\nly. In both L12 and L10 ordering some considerations related to the application of the Third Law of Thermodynamics to solid solution models will be discussed.\n LAST-MODIFIED:20230127T204754Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chemical and Nuclear Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101119T180000Z DTEND:20101119T190000Z DTSTAMP:20260828T094430Z UID:h7os3m3a34nlqfsoremn4uu36o@google.com CREATED:20101008T185928Z DESCRIPTION:Title : From Pop-in to Pillars: The Utility of Nanoindentation in Studying the Mechanisms of Small-Scale Plasticity\nSpeaker Name: George Pharr\nSpeaker Institution : University of Tennessee—Knoxville/Oak Ridge Na tional Laboratory\nAbstract : Since its development in the mid-1980's\, nan oindentation has proven to be a primary tool for discovering and characteri zing a variety of unique deformation phenomena that have improved our under standing of the mechanisms of small-scale plasticity. Among these are the i ndentation size effect\, in which hardness at small length scales increases due to plastic strain gradients\; indentation pop-in\, in which sudden dis placement excursions are caused by homogenous nucleation of dislocations at stresses approaching the theoretical strength\; and micro-pillar compressi on testing\, in which the nanoindenter is used as a small-scale compression testing apparatus to explore deformation phenomena in samples small enough to probe single dislocation events. Many of these phenomena are interrelat ed in ways which are not at first obvious. In this presentation\, experimen tal observations are presented that elucidate the relations between pop-in and pillar testing and help us to better \n\nunderstand the basic mechanism s controlling small-scale plasticity. LAST-MODIFIED:20230127T205308Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Bldg SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130905T180000Z DTEND:20130905T190000Z DTSTAMP:20260828T094430Z UID:u0bp1ea7dlh548b2a142gdn7t0@google.com CREATED:20130826T184731Z DESCRIPTION:Title: Spiral twisting of the anapole moments of loop currents as a possible origin of gyrotropy in cuprates\n\nSpeaker: Victor Yakovenko\ , University of Maryland\n\nAbstract: We propose a novel chiral order param eter to explain recent experimental developments concerning the polar Kerr effect in underdoped cuprates. Until last year\, experimental observation o f the polar Kerr effect in the pseudogap phase of cuprates was interpreted as a signature of a ferromagnetic-like time-reversal symmetry breaking. How ever\, more recent measurements\nsuggest that this interpretation is not co rrect\, and the polar Kerr effect is more likely to originate from a chiral and inversion symmetry breaking\, which results in handedness and spatial dispersion with gyrotropy. Our theoretical scenario is based on the loop-cu rrent model by Varma\,which is characterized by the in-plane anapole moment N and exhibits the magnetoelectric effect. We propose a helical structure where the vector N(n) in the layer n is twisted by the angle pi/2 relative to N(n-1)\, thus breaking inversion symmetry. As a\nresult\, the magnetic f ield lines produced by the loop currents get twisted in a double-helix mann er reminiscent of DNA. We show that coupling between magnetoelectric terms in the neighboring layers for this structure produces optical gyrotropy\, w hich results in circular and linear dichroism and the polar Kerr effect. An estimate of the Kerr angle gives an order of magnitude comparable with the experiment. LAST-MODIFIED:20230127T205121Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111109T200000Z DTEND:20111109T210000Z DTSTAMP:20260828T094430Z UID:37mibcgp14oljpk9e9iunb4ucs@google.com CREATED:20111104T133025Z DESCRIPTION:Speaker: Jeremy N. Munday\, Institute for Research in Electroni cs and Applied Physics\nDepartment of Electrical and Computer Engineering\, University of Maryland\nTitle: Photonics and plasmonics for energy\nAbstra ct: Two topics that have received significant\, renewed interest over the past 5-10 years are plasmonics and alternative energy. The hope is that the emerging field of plasmonics can lend itself to the problem of finding new ways to improve the efficiencies of solar cells or lead to new energy harv esting techniques. In this talk\, I will give a brief overview of the curre nt status of the field and discuss future directions for making the most of light trapping in the context of solar energy conversion using both photon ics and plasmonics. LAST-MODIFIED:20230127T204113Z LOCATION:Seminar Room\, Lower Level\, LPS 8050 Greenmead Drive College Pa rk\, MD 20740 301-935-6400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131002T133000 DTEND;TZID=America/New_York:20131002T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20131002T133000 CREATED:20130816T163032Z DESCRIPTION:Title: Parametrizing scalar corrections to general relativity\n \nSpeaker: Leo Stein\, Cornell University\n\nAbstract: General relativity p asses all tests of gravity so far\, but\nnone of these are in the truly str ong-field\, dynamical regime of the\ntheory. On general grounds we expect t he theory to be incomplete and\nrequire corrections. I will discuss some fo rms that corrections may\ntake and where to look for them. The workhorse wi ll be the\nphenomenology of the compact binary system's inspiral\, with dyn amical\nChern-Simons theory as a prototypical example of a correction. If\n nature is kind\, we can constrain or measure these corrections with\nfuture pulsar timing or gravitational wave detections. LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121217T203000Z DTEND:20121217T213000Z DTSTAMP:20260828T094430Z UID:3gmdfdnvfglarahjb1rm5sceoc@google.com CREATED:20121212T154436Z DESCRIPTION:Speaker: Pengcheng Dai\, University of Tennessee\n\nTitle: A ma gnetic origin for high temperature superconductivity in iron pnictides\n\nA bstract: In conventional Bardeen-Cooper-Schrieffer (BCS) superconductors\, superconductivity occurs when electrons form coherent Cooper pairs below t he superconducting transition temperature Tc. Although the kinetic energy o f paired electrons increases in the superconducting state relative to the n ormal state\, the reduction in the ion lattice energy is sufficient to give the superconducting condensation energy. For high-Tc superconductors deriv ed from electron or hole doping of their antiferromagnetic (AF) parent comp ounds\, if spin excitations are responsible for mediating electron pairing and superconductivity\, the superconducting condensation energy should aris e from the change in magnetic exchange energy (~J) between the normal (N) a nd superconducting (S) states. Here we use neutron scattering to show that high-Tc superconductivity occurs in iron pnictides with low-energy (≤ 25 me V or ∼ 6.5kBTc) itinerant electron-spin excitation coupling as well as high energy (> 100 meV) spin excitations. Since our absolute spin susceptibilit y measurements for optimally hole-doped iron pnictide reveal that the chang e in magnetic exchange energy below and above Tc can account for the superc onducting condensation energy\, we conclude that the presence of both high- energy spin excitations giving rise to a large J and low-energy spin excita tions coupled to the itinerant electrons is essential for high-Tc supercond uctivity in iron pnictides. \n\nHost: Rick Greene LAST-MODIFIED:20230127T204139Z LOCATION:Physics Room 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM SPECIAL SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120409T163000Z DTEND:20120409T173000Z DTSTAMP:20260828T094430Z UID:6r3dtr4gpr2tpftnqj9cvmfc4k@google.com CREATED:20120405T142742Z DESCRIPTION:Titles and Speakers:\nFrom topological semimetal to zero-field fractional quantum Hall effect (Kai Sun\, UMD)\nMeasuring the superfluid Ha ll effect in a Bose-Einstein condensate (Lindsay Leblanc\, UMD)\n\nAbstract s: \nKai Sun\nThe search for novel topological states of matter\, where the quantum phase is characterized not by an order parameter but by some under lying topology\, has been the focus of extensive studies since the discover y of the integer and fractional quantum Hall effects in two-dimensional sem iconductors. These studies not only improve our understanding about topolog ical states\, but also have important potential applications (e.g. topologi cal quantum computing)\, due to the unique and nontrivial topological prope rties of these systems. In band insulators\, it has been known that the key ingredient to stabilize a topologically nontrivial insulating state is to introduce either some external magnetic fields (e.g. the integer quantum Ha ll effect) or spin-orbit couplings (e.g. the Z_2 topological insulators). I n this talk\, I present the theoretical discovery of a novel class of topol ogical insulators\, which are stabilized by interaction effects in the abse nce of external field or spin-orbit coupling\, utilizing topological semime tals. I will further demonstrate that this construction can be further gene ralized to stabilize fractional topological insulators in the absence of La ndau levels or external magnetic fields. Experimental implications in conde nsed matter systems and cold atomic gases will also be discussed. \n\nRefer ences:\n[1] Kai Sun\, W. Vincent Liu\, Andreas Hemmerich and S. Das Sarma\, Nature Physics\, 8\, 67-70 (2012).\n[2] Kai Sun\, Zhengcheng Gu\, Hosho Ka tsura and S. Das Sarma\, Phys. Rev. Lett. 106\, 236803 (2011).\n[4] Kai Sun \, Hong Yao\, Eduardo Fradkin and Steven A. Kivelson\, Phys. Rev. Lett. 103 \, 046811 (2009). \n\nLindsay Leblanc\nIn condensed matter physics\, the Ha ll effect is used as a measurement tool in applications ranging from measur ing the charge carrier concentrations in semiconductors to identifying the quantum Hall effects. Inspired by its usefulness and ubiquity\, we studied the Hall effect for a neutral atomic Bose-Einstein condensate (BEC) subject ed to an artificial magnetic field. By driving transport within the BEC\, w e find that a non-zero artificial field modifies atomic motion in analogy t o the real field modification of electric motion in a solid\, demonstrating the Hall effect. A quantitative comparison between our data and the predic tions of BEC hydrodynamics shows that the Hall signal we observe is a measu re of the system’s irrotational superfluid properties. By extending this te chnique to other experiments\, both the technical advantages of ultracold a toms and the power of the Hall effect could be exploited to understand the details of strongly correlated systems. \n\n LAST-MODIFIED:20230127T203935Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - 2 Postdocs. TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110328T163000Z DTEND:20110328T173000Z DTSTAMP:20260828T094430Z UID:ib4411ir06nbcc9fo822dbno24@google.com CREATED:20110303T201655Z DESCRIPTION:Title: Quantum simulation with trapped ions\nSpeaker: Emily Edw ards\nAffiliations:E. E. Edwards1\, R. Islam1\, S. Korenblit1\, K. Kim1\, M .-S. Chang1\,\nG.-D. Lin2\, L.-M. Duan2\, C. Noh3 \, H. Carmichael3\, C.-C. Wang4\, J. Freericks4\, and C. Monroe1\n1Joint Quantum Institute: Departme nt of Physics\, University of Maryland\, and National Institute\nof Standar ds and Technology\, College Park\, Maryland 20742\, USA\n2 MCTP\, Departmen t of Physics\, University of Michigan\, Ann Arbor\, Michigan 48109\, USA\n3 Department of Physics\, University of Auckland\, Private Bag 92019\, Auckla nd\, NZ\n4Department of Physics\, Georgetown University\, Washington DC 200 57\, USA\nAbstract:We experimentally simulate the transverse-field long ran ge Ising model using a collection of trapped atomic ions. The phase diagram contains interesting features such as quantum phase transitions (QPT) and first order transitions due to frustration i.e.\, competition between spin- spin couplings. The ground-state spin order is a function of the signs and strengths of the Ising couplings\, which are precisely controlled. In the s implest version of this experiment the spin-spin couplings are ferromagneti c and\, in the thermodynamic limit\, the system exhibits a QPT from a param agnet to a ferromagnet. In the experiment\, the spins are initially polariz ed along a transverse effective magnetic field and the Ising interactions a re switched on\, while the transverse field is adiabatically reduced. The p robabilities of different magnetic orders for system sizes of up to ~10 spi ns are measured through standard state-dependent fluorescence techniques. I will also report on progress towards implementing a pulsed laser system\, which will reduce simulation errors. This will allow for scaling up the sys tem to much larger numbers of\nspins where classical simulations of certain classes of the Ising model become intractable.\nThis work is supported by the Army Research Office (ARO) with funds from the DARPA\nOptical Lattice E mulator (OLE) Program\, IARPA under ARO contract\, the NSF Physics at the I nformation Frontier Program\, and the NSF Physics Frontier Center at JQI.\n \nTitle: Dynamic vortex unbinding following a quantum quench in bosonic mi xtures\nSpeaker: Ludwig Mathey\nAffiliations: Dynamic vortex unbinding foll owing a quantum quench in bosonic mixtures\nAbstract: We study the many-bod y dynamics of a mixture of two hyperfine states of bosonic atoms in 2D\, fo llowing a pi/2-pulse. Using both a numerical implementation of the Truncate d Wigner approximation and an analytical approach\, we find that a dynamic Kosterlitz-Thouless transition can be triggered\, in which the system relax es from a superfluid to a disordered state via vortex unbinding. This evolu tion across a critical point can be dynamically suppressed\, which creates a long-lived metastable supercritical state. We discuss the realization and detection of these effects. \n\n\nTitle: Majorana fermions and chiral Rash ba spin textures in ultra-cold Fermi gases\nSpeaker: Jay D. Sau\nAffiliatio ns: Condensed Matter Theory Center Maryland and JQI-PFC.\nAbstract: Spin-or bit coupling is an important ingredient in many recently discovered phenom ena such as the spin-Hall effect and topological insulators. Of particular interest is topological superconductivity\, with its potential applicatio n in topological quantum computation. The absence of disorder in ultra-cold atomic systems makes them ideal for quantum computation applications\, ho wever\, the spin-orbit (SO) coupling schemes proposed thus far are experime ntally impractical owing to large spontaneous emission rates in the alkali fermions.\n In this short presentation\, I will quickly review the basics o f what Majorana fermions are\, why they are interesting and how they might be useful for topological quantum computation. \nThen I will discuss a new scheme to generate Rashba SO coupling with\n a low spontaneous emission ext ension to a recent experiment which\n was done in Ian Spielman's group at NIST. We show that this scheme generates a Fermi surface spin texture for $^{40}\\rm{K}$ atoms\, which is observable in time-of-flight measurements. The chiral spin texture\, together with conventional $s$-wave interactions leads to topological superconductivity and non-Abelian Majorana quasiparti cles.\n LAST-MODIFIED:20230127T203949Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar-Emily Edwards\, Ludwig Mathey\, and Jay Deep Sau TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090115T173000Z DTEND:20090115T183000Z DTSTAMP:20260828T094430Z UID:8t7pjokm1nsa6go942sdrlsoho@google.com CREATED:20090114T203026Z DESCRIPTION:Title : Time averaged properties along unstable periodic orbits and\n chaotic orbits in some systems of differential equations\n\nSpeaker : Yoshitaka Saiki (Research Institute for Mathematical Sciences\,\n Kyo to University)\n LAST-MODIFIED:20230127T205002Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121003T183000Z DTEND:20121003T193000Z DTSTAMP:20260828T094430Z UID:r7ugu32iuo3ss9iouf6sf1av0g@google.com CREATED:20120913T171600Z DESCRIPTION:SPEAKER: Amy Nicholson - TQHN\nTITLE: Noise\, sign problems\, and chiral symmetry breaking\nABSTRACT: Lattice calculations at finite bar yon density are greatly hindered by the well known QCD sign problem and the signal-to-noise problem for baryon correlators\, both of which are related to the presence of light pions in the theory. In this talk\, I will show t hat noise in lattice calculations tends to fall into two classes\, symmetri c and long-tailed\, based on the dynamics of the theory\, as well as offer a solution to noise problems involving long-tailed distributions. I will th en present a QCD-like model with chiral symmetry breaking in which we find two physically equivalent formulations: one with a Monte Carlo sign problem and one without\, and derive the distributions for fermion correlators in each formulation. Using the results of this study\, I will show a possible method for ameliorating the QCD sign problem. LAST-MODIFIED:20230127T204917Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111003T163000Z DTEND:20111003T173000Z DTSTAMP:20260828T094430Z UID:tkafv4c0q5ikggl1vv4m2o9cr8@google.com CREATED:20110913T175050Z DESCRIPTION:TITLE: "Superfluid Phase Transition of Long-Lifetime Polaritons "\nSPEAKER: David Snoke\, University of Pittsburgh\nABSTRACT:Polaritons are quasiparticles of electronic excitation in semiconductor structures with e xtremely light mass\, about four orders of magnitude less than a free elect ron. Because of this very light mass\, polaritons show Bose quantum effects even at moderate densities and temperatures from tens of Kelvin up to room temperature. In the past five years\, multiple experiments have shown effe cts of polaritons analogous to Bose condensation of cold atoms\, such as a bimodal momentum distribution\, quantized vortices\, Bogoliubov excitation spectrum\, and spatial condensation in a trap. In these experiments\, thoug h\, the lifetime of the polaritons has been just a little longer than their thermalization time\, which means that nonequilibrium effects play an impo rtant role\; in particular\, the transition to superfluidity has been smear ed out rather than a sharp transition. In this talk I report new results wi th polaritons that have very long lifetime compared to their thermalization time. We see a discontinuous jump in the properties of the polariton gas i ndicative of a true phase transition\, and we see ballistic transport over hundreds of microns. \nWe also now have a way to use a laser to create a p otential barrier for the polaritons.\n\n LAST-MODIFIED:20230127T205114Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar-David Snoke TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110222T210000Z DTEND:20110222T220000Z DTSTAMP:20260828T094430Z UID:q03rfpvf94po2c33kregk9hit8@google.com CREATED:20110216T141102Z DESCRIPTION:Title: The Dangers of Drilling Deep\nSpeaker: James Glanz\, The New York Times\nAbstract: As they drill deeper and deeper in search of ene rgy\, engineering companies sometimes unleash subterranean forces that - li ke the sleeping dragon of Beowulf\, left to guard the ancestral treasure - do not behave kindly or predictably when roused. The consequences can be di sastrous\, as BP\, Transocean and other companies found when a fail-safe de vice called a blowout preventer was unable to stop oil and gas from gushing out of a damaged\, 3.4-mile-deep well in the Gulf last year. The perils ar e not limited to drilling for oil: seekers of geothermal energy deep in the Earth's crust have induced earthquakes strong enough to frighten whole cit ies and stir implacable community opposition. As a journalist with a scienc e background who has reported on these debacles\, I have found the common f actors to be\, first\, an unwillingness to step back and assess the true - and often daunting - extent of the risks and technical challenges involved\ ; and second\, an aversion to communicating those facts to the public befor e the dragon is loosed upon the world.\n\n LAST-MODIFIED:20230127T204412Z LOCATION:PHYS 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111103T180000Z DTEND:20111103T193000Z DTSTAMP:20260828T094430Z UID:rp189u0nvstgnslrdp4etto0r4@google.com CREATED:20110914T203432Z DESCRIPTION:Speaker: Lesik Motrunich\, Caltech\nTitle: Lesik Motrunich\, California Institute of Technology\nAbstract: Metal-like phases ("Bose-met als") of frustrated spins and bosons\nThis seminar will describe recent pro gress in understanding of quantum phases of 2D correlated boson or spin sys tems which exhibit "Bose-metal" type phases with gapless excitations residi ng on surfaces in momentum space. A spin liquid phase with a Fermi surface of spinons is one example of interest\, being potentially relevant to the o rganic spin liquid materials κ-(ET)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2. I wil l discuss frustrated spin and boson models with ring exchanges that may sta bilize such phases\, in particular in the vicinity of the Mott transition a s is the case in the organic materials. Controlled numerical studies of suc h models on quasi-1D ladders and in some limiting 2D cases strongly suggest that Bose-metal phases are indeed present in 2D. I will also describe very recent studies of new classes of gapless spin liquid phases where exact an alytical treatments are possible. LAST-MODIFIED:20230127T205308Z LOCATION:Rm 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130208T130000 DTEND;TZID=America/New_York:20130208T140000 DTSTAMP:20260828T094430Z UID:63vbbgdpk77qe40rjng87laic4@google.com RECURRENCE-ID;TZID=America/New_York:20130208T130000 CREATED:20130108T151219Z DESCRIPTION:NEW TITLE: Chemical\, Structural\, and Magnetic Trends in Iron- Based Superconductors\n\nNEW SPEAKER: Efrain E. Rodriguez\n\nNEW INSTITUTIO N: Department of Chemistry and Biochemistry\, University of Maryland\, Coll ege Park\n\nNEW ABSTRACT: Superconductors represent a real advance in mater ials for energy-related applications\, either through storage of energy as a magnetic field\, or through their energy efficiency (they exhibit zero el ectrical resistivity). As with the high-Tc superconducting cuprates\, there is a challenge in relating chemical composition to physical properties in iron-based superconductors. Here\, we present how we have combined solid-st ate chemistry with advanced characterization techniques to understand the k ey chemical\, structural\, and magnetic trends that make these materials su perconducting. In particular\, we have studied the chalcogenide system Fe1+ x(S\,Se\,Te) and the effects of both the amount of interstitial iron\, x\, and anion substitution on its properties. Advanced scattering techniques su ch as neutron single crystal diffraction and spectroscopy were utilized to see how the magnetic excitations are possibly related to superconductivity. LAST-MODIFIED:20230127T204752Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130417T190000Z DTEND:20130417T200000Z DTSTAMP:20260828T094430Z UID:5ds7fq8pgh86smmohu5o68art0@google.com CREATED:20130412T193056Z DESCRIPTION:Jonathan R. Friedman\nAmherst College\n\nSingle-molecule Nanoma gnets\n\nA single-molecule magnet is – true to its name – a magnet composed of a single molecule. The magnetic moment of such a molecule shows hystere sis like a classical magnet\, yet it can tunnel between different orientati on states. I will review some of the basic properties of this interesting c lass of materials and\, in particular\, their interaction with microwave ra diation\, which can induce coherent phenomena such as Rabi oscillations and collective coupling of an ensemble of these magnets to a resonant mode of a cavity (vacuum Rabi splitting). I will also discuss the prospects for usi ng these systems for storage and processing of classical and quantum inform ation.\n LAST-MODIFIED:20230127T204705Z LOCATION:2115 CSS Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120425T181500Z DTEND:20120425T191500Z DTSTAMP:20260828T094430Z UID:rfg28ib0teegar6fi6itt1s188@google.com CREATED:20120206T191824Z DESCRIPTION:SPEAKER: Aron Bernstein - Massachusetts Inst of Technology\, C ambridge\nTITLE: Measurement of the pi0 Lifetime: QCD Axial Anomaly and Ch iral Symmetry \nABSTRACT: A brief history of the measurements of the pi0 li fetime will\nbe presented\, highlighted by a new Primakoff effect measureme nt with\nan accuracy of 3%. This tests a prediction due to the axial anomal y of\nQCD\, modified by a small isospin breaking chiral correction which is \nproportional to the mass difference of the up and down quarks. The\nimpli cations of this result for future experimental tests of the axial\nanomaly will be discussed\, along with some other processes that are\nsensitive to isospin breaking.\n\n LAST-MODIFIED:20230127T205259Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101103T191500Z DTEND:20101103T201500Z DTSTAMP:20260828T094430Z UID:39babqremrc5aru23aguseaj0o@google.com CREATED:20101019T204702Z DESCRIPTION:[Title] Model Selection and Gravitational Wave Data Analysis\n[ Speaker] Tyson Littenberg\n[Institution] University of Maryland\n[Abstract] The analysis of gravitational wave data involves many challenging model se lection problems. Robust detection algorithms are needed to "get our money 's worth" from the current and future observatories. These challenges may best be addressed in a Bayesian framework where promising algorithms have b een developed\, often using the Markov Chain Monte Carlo (MCMC) algorithm a s the foundation. I will provide an overview of MCMC inspired data analysis methods and highlight their effectiveness in solving two important data an alysis challenges: The "detection problem" of distinguishing a gravitation al wave signal from instrument noise in LIGO data\, and the simultaneous de tection of signals from many millions of overlapping sources in LISA data.\ n LAST-MODIFIED:20230127T204543Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101118T173000Z DTEND:20101118T183000Z DTSTAMP:20260828T094430Z UID:hdvjuulmkjtfb0glvip3qngv8c@google.com CREATED:20101115T193507Z DESCRIPTION:Title: Disordered Nonlinear Systems: from Localization to Hyper -transport\nSpeaker: Dr. Yevgeny Krivolapov\, Technion – Israel Institute o f Technology\nDept. of Physics LAST-MODIFIED:20230127T204019Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121204T190000Z DTEND:20121204T200000Z DTSTAMP:20260828T094430Z UID:c4oqa61kns3reu5jsj7bj48ud8@google.com CREATED:20120831T154223Z DESCRIPTION:Title: "Higgs properties: current status and near-future"\nSpea ker: Kyle Cranmer\nInstitution: NYU\, ATLAS\nAbstract: The discovery of a n ew particle in the search for the Standard Model Higgs boson is a huge step forward. What do we know about this particle in terms of its mass\, it's d iscrete quantum numbers\, and couplings? I will give an overview of the str ategy to answering these questions\, the most recent results\, and the near -term prospects.\n*preceded by lunch at 12:30 pm in 1305F (Toll room) in Ph ysics Bldg LAST-MODIFIED:20230127T204256Z LOCATION:1201 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT seminar Joint with Johns Hopkins TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130301T200000Z DTEND:20130301T210000Z DTSTAMP:20260828T094430Z UID:uf0853hmi0jeljn29gbk0qp8uo@google.com CREATED:20130226T201617Z DESCRIPTION:"Visual Guidance of Flight in Birds and Bees\, and Applications to Robotics" \nProfessor Mandyam Srinivasan\nQueensland Brain Institute\nU niversity of Queensland\, Australia\n\nProfessor Srinivasan’s research focu ses on the principles of visual processing\, perception and cognition in si mple natural systems\, and on the application of these principles to machin e vision and robotics.The topic he will address is : “Visual Guidance of Fl ight in Bees and Birds\, and Applications to Robotics.”\n\nMore information can be found here: http://www.ece.umd.edu/events/index.php?mode=4&id=8069 \nBooz Allen Hamilton Distinguished Colloquium in Electrical and Computer E ngineering\n\nCo-sponsored by Lockheed Martin and the University of Marylan d Robotics Center\n\n LAST-MODIFIED:20230127T204017Z LOCATION:Kim Building\, Room # 1110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:ECE Booz Allen Hamilton Distinguished Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101209T140000 DTEND;TZID=America/New_York:20101209T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20101209T140000 CREATED:00010101T000000Z DESCRIPTION:Title: London penetration depth measurements in iron-based supe rconductors\nSpeaker: Ryan Gordon\, Iowa State University and Ames National Laboratory\n[Note] Refreshment is served at 1:30pm in room 1305F (new Toll Room) LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110513T183000Z DTEND:20110513T210000Z DTSTAMP:20260828T094430Z UID:2kghns21msau556irtch2231s4@google.com CREATED:20110503T145657Z DESCRIPTION:Title : Mathematical Models of Leukemia\, Cancer Stem Cells\, a nd Drug Resistance.\nSpeaker Name: Dr. Doron Levy\nSpeaker Institution : Un iversity of Maryland\, Department of Mathematics and Center for Scientific Computation and Mathematical Modeling.\nNotes: SPECIAL SEMINAR\nAbstract : Leukemia is a cancer of the blood that is characterized by an abnormal prod uction of white blood cells. Traditional approaches for treating leukemia combine chemotherapy\, radiotherapy\, and bone marrow (or stem cell) trans plants. The treatment of Chronic Myelogenous Leukemia (CML) was revolution ized over the past decade with the introduction of new molecular-targeted d rugs. Unfortunately\, these drugs keep many patients in remission but do no t cure the disease.\n\nIn this talk we will present our proposal for improv ing the treatment of CML. Our main idea is to boost the anti-leukemia immu ne response by providing timed cancer vaccines in intervals and doses that are adjusted to the individual immune response of each patient. We will al so discuss our recent work on mathematical models of cancer stem cells and their role in developing drug resistance. When combined with clinical and experimental data\, our mathematical analysis of drug resistance provides n ew insights on how to approach treating CML. This is a joint work with Pete r Kim\, Cristian Tomasetti\, and Peter Lee. LAST-MODIFIED:20230127T204129Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110512T150000Z DTEND:20110512T160000Z DTSTAMP:20260828T094430Z UID:voguj3ndiaviuq6vp76odvk1d4@google.com CREATED:20110511T134901Z DESCRIPTION:Title: GW astrophysics with compact binaries\nSpeaker: Ilya Man del\nInstitution: MIT/University of Birmingham\nAbstract: The ground-based gravitational-wave telescopes LIGO and Virgo approach the era of first dete ctions. In this talk\, I will review the current knowledge of the coalesce nce rates and parameter distributions of merging neutron-star and black-hol e binaries. I emphasize the bi-directional connection between gravitationa l-wave astronomy and conventional astrophysics. Astrophysical input will ma ke possible informed decisions about optimal detector configurations and se arch techniques. Meanwhile\, rate upper limits\, detected merger rates\, an d the distribution of masses and spins measured by gravitational-wave searc hes will constrain astrophysical parameters through comparisons with astrop hysical models. I report on ongoing efforts to develop a framework for conv erting gravitational-wave observations into improved constraints on astroph ysical parameters and discuss future developments necessary to the success of gravitational-wave astronomy. LAST-MODIFIED:20230127T205017Z LOCATION:1255 CSS Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081022T190000Z DTEND:20081022T200000Z DTSTAMP:20260828T094430Z UID:ea3u8d3f3c2fvf20oeq43if99o@google.com CREATED:20081015T155145Z DESCRIPTION:Title: Nonlinear phase-locking in high-Q Josephson resonators: bifurcation readout without switching\nSpeaker: Ofer Naaman\, University o f California\, Berkeley \n LAST-MODIFIED:20230127T204044Z LOCATION:LPS Building\, Seminar Room\, Lower Level SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120309T003000Z DTEND:20120309T013000Z DTSTAMP:20260828T094430Z UID:en6u5u6k08aara12dmvlhsoj7g@google.com CREATED:20110818T203740Z DESCRIPTION:Delve into demonstrations of color\, color mixing and color vis ion. See non-spectral colors ---colors that are not in the rainbow! Observe the Land Effect and be amazed by “greener than green!”\n\nDoors open 7:00P M\nFor directions and further information call 301-405-6045 or visit www.ph ysics.umd.edu/lecdem \nTo volunteer\, call 301-405-5982 LAST-MODIFIED:20230127T204905Z LOCATION:Physics Lecture Halls SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics is Phun - Color TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081103T190000Z DTEND:20081103T200000Z DTSTAMP:20260828T094430Z UID:48v00nunc8t478q2oqmf92oaj0@google.com CREATED:20080915T190246Z DESCRIPTION:Speaker:Pran Nath\, Northeastern University\nTitle:"High scale Physics Connection to LHC Data"\n LAST-MODIFIED:20230127T205105Z LOCATION:Physics Building\, Room: 4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130207T183000Z DTEND:20130207T190000Z DTSTAMP:20260828T094430Z UID:b0d4m7k777g9r25ugodq0bt7c0@google.com CREATED:20130206T222259Z LAST-MODIFIED:20230127T205119Z SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Refreshments for Cond. Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110920T171500Z DTEND:20110920T183000Z DTSTAMP:20260828T094430Z UID:6vcs4pjs196367j9n6h99i20a4@google.com CREATED:20110913T151529Z DESCRIPTION:Title : STRONGLY COUPLED & CRITICAL COULOMB SYSTEMS: After 20 Y ears\, What's New for Debye\, Bjerrum\, & Landau?\nSpeaker Name: Dr. Michae l E. Fisher\nSpeaker Institution : Institute for Physical Science and Techn ology\, University of Maryland\nNotes: As in the past\, each seminar will b e preceded by an INFORMAL CAFETERIA LUNCH to which all are welcome\, depart ing from Room 1108 about five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T205131Z LOCATION:Location: Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:INFORMAL STATISTICAL PHYSICS SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111221T190000Z DTEND:20111221T203000Z DTSTAMP:20260828T094430Z UID:p9kd39nr79sudos3c4jl202elg@google.com CREATED:20111221T153531Z DESCRIPTION:SPEAKER: Atilla Dobi – Univ of Maryland (ENP Group)\n\nTITLE: Purity Analysis for Xenon Detectors\n\n\n LAST-MODIFIED:20230127T204359Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Candidacy Talk (ENP) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081113T180000Z DTEND:20081113T193000Z DTSTAMP:20260828T094430Z UID:ipsj4rp6sbjd31onfn7ela3ar0@google.com CREATED:20081107T202610Z DESCRIPTION:Title: "Top Production at the Tevatron"\nSpeaker: Dr. Thomas Sc hwarzFermilab\n LAST-MODIFIED:20230127T204631Z LOCATION:4316 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091109T200000Z DTEND:20091109T210000Z DTSTAMP:20260828T094430Z UID:clenba62a3tup126i3haqr5ha8@google.com CREATED:20091030T203722Z DESCRIPTION:[Title] Dark Particles and their Experimental Signatures \n[Spe aker] Itay Yavin \n[Institution] New York University\n[Abstract] New experi mental results are pointing to a more intricate structure of dark matter th an previously imagined. I will describe the relevant observations and discu ss some of the promising models for the dark sector. Particular attention w ill be drawn to the experimental signatures of this extended structure in h adron colliders as well as cosmic ray and neutrino observatories. LAST-MODIFIED:20230127T204057Z LOCATION:4102 Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111128T173000Z DTEND:20111128T183000Z DTSTAMP:20260828T094430Z UID:v5ql6minik4je29v06k51u8qa0@google.com CREATED:20111024T132526Z DESCRIPTION:Speaker: Mete Atature\nInstitution: University of Cambridge\nTi tle: Spins and Photons of Quantum Dots\nAbstract: Self-assembled semiconduc tor quantum dots are interesting and rich physical systems. Their inherentl y mesoscopic nature leads to a multitude of interesting interaction mechani sms of confined spins with the solid state environment of spins\, charges a nd phonons. In parallel\, the relatively clean spin-dependent optical trans itions make quantum dots strong candidates for stationary and flying qubits within the context of spin-based quantum information science. The recently observed quantum dot resonance fluorescence has become a key enabler for f urther progress in this context. I will first discuss the real-time optical detection (or single-shot readout) of quantum dot spins\, and then I will discuss how resonance fluorescence allows coherent generation of single pho tons suitable (and tailored) for linear-optics quantum computation and for establishing a high-efficiency spin-photon quantum interface within a distr ibuted quantum network.\n LAST-MODIFIED:20230127T204114Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI SEMINAR - METE ATATURE TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090910T193000Z DTEND:20090910T203000Z DTSTAMP:20260828T094430Z UID:9usdlfpek7gqn2ntpsno5imbno@google.com CREATED:20090903T184504Z DESCRIPTION:Title : The quantum Big Bounce for an inhomogeneous cosmologica l model\nSpeaker Name: David Brizuela\nSpeaker Institution : CSIC\, Madrid Spain\nAbstract : We present an analysis of the quantum dynamics of an inho mogeneous and anisotropic universe making use of Loop Quantum Cosmology tec hniques. This study is performed in the context of the classical effective dynamics and different regimes\, from the homogeneous to the inhomogeneitie s dominated universe\, are considered. Combining both analytical treatments and numerical tools we show that\, for all these cases\, the classical ini tial singularity is replaced by a quantum bounce that joins two large class ical universes. The behavior of the inhomogeneities through the bounce is a lso analyzed. LAST-MODIFIED:20230127T205122Z LOCATION:4102 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090310T160000 DTEND;TZID=America/New_York:20090310T170000 DTSTAMP:20260828T094430Z UID:oiherbvqgudjapqso6ocvvvkmc@google.com RECURRENCE-ID;TZID=America/New_York:20090310T160000 CREATED:20090126T164931Z DESCRIPTION:Speaker: Mark Alford\, Washington University\, St. Louis\nTitle : Superconducting Quarks: Condensed Matter in the Heavens LAST-MODIFIED:20230127T204241Z LOCATION:Physics Building\, Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101014T140000 DTEND;TZID=America/New_York:20101014T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20101014T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Exploiting common building blocks to discover and unde rstand unconventional superconductors"\n[Speaker] Filip Ronning\n[Instituti on] Los Alamos National Laboratory\n[Abstract] Superconductivity is often f ound in families of compounds which share a common building block (e.g. CuO 2 planes in cuprates\, FeAs planes in pnictides\, and CeIn3 planes in a sub set of heavy fermion superconductors). This fact provides a rationale to se arch for new superconductors\, and subsequently a means to try and understa nd the origin of superconductivity by examining trends in superconducting b ehavior within a family of superconductors which hopefully transcends any o ne particular family of compounds. I will discuss our attempts to understan d the origin of unconventional superconductors in heavy fermions and Fe-bas ed superconductors. The notion of common building blocks has led us to the recent discovery of superconductivity at 2.1 K in CePt2In7\, and to the dis covery of superconductivity in several ANi2Pn2 compounds (A=Ba\, Sr\, Ca\; Pn = P\, As). Surprisingly\, the latter result may suggest that phonons are the pairing mechanism in Fe-pnictide superconductors.\n[Note] Refreshment is served at 1:30pm in room 1305F (new Toll Room) LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110126T163000Z DTEND:20110126T180000Z DTSTAMP:20260828T094430Z UID:d5a9ge1cus3r22p38esm8vsi2g@google.com CREATED:20110124T125543Z DESCRIPTION:SPEAKER: Evan Berkowitz – University of Maryland \n\nTI TLE: Vortons at High Density\n\nABSTRACT: A vorton is a supercon ducting ring-shaped vortex that occurs in the bulk of a superfluid. While a plain vortex loop is unstable\, vortons may be supported by having the inn er field carry angular momentum or charge. When realistic quark masses are considered\, the color-superconducting phase of quark matter expected at hi gh density has all the necessary ingredients to support superconducting vor tons. The charged version of these vortons may act like toroidal nuclei fo r "atoms" inside neutron stars. I will discuss the stability\, size\, and p roperties of these objects.\n\n LAST-MODIFIED:20230127T204108Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211112T180000Z DTEND:20211112T190000Z DTSTAMP:20260828T094430Z UID:3kl9ngbbitpio91fuevgous6h2@google.com CREATED:20210914T150950Z DESCRIPTION:Speaker: Turon Birol\, Assistant Professor\, Chemical Engineeri ng &\; Materials Science\, University of Minnesota

      Title: Turon B irol\, Assistant Professor\, Chemical Engineering &\; Materials Science \, University of Minnesota

      Abstract: First principles computational methods provide a reliable means to both reproduce and predict the properti es of crystalline materials. These approaches can also be used to perform t hought experiments to elucidate the microscopic mechanisms of macroscopic p henomena\, build structure-property relationships\, and design new material s with desired properties. In this talk\, Dr. Birol is going to present res ults from his recent work on a wide range of emergent phenomena including c harge density wave transitions\, metallic "ferroelectricity\," and transpar ent correlated metals. He will also discuss the capabilities and shortcomin gs of three theoretical tools we use most often: Density Functional Theory (DFT)\, which is the workhorse of first principles calculations of crystall ine materials\; Dynamical Mean Field Theory (DMFT)\, which has recently eme rged as a means to perform correlated materials design\; and group and repr esentation theories\, which provide a systematic way to approach the symmet ry related properties of materials.

      Bio:

      Turan Birol received his BS and PhD in Physics from the Middle East Technical University and Cornell University respectively. Prior to joining the University of Minnesota depa rtment of Chemical Engineering and Materials Science as an assistant profes sor in 2016\, he was a postdoctoral associate in Rutgers University condens ed matter theory group. He has recently received the National Science Found ation CAREER award\, the Office of Naval Research young investigator award\ , and the University of Minnesota McKnight Land-Grant Professorship. Birol' s research interests lie on the intersection of materials science\, condens ed matter physics\, and physical chemistry\; and his research program aims to elucidate the connection and couplings between the crystal structure and electronic properties of quantum materials. \;

      LAST-MODIFIED:20230127T204915Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111110T190000Z DTEND:20111110T203000Z DTSTAMP:20260828T094430Z UID:ogfcmku8msgc962blr2j0v769c@google.com CREATED:20110914T203532Z DESCRIPTION:Speaker: Ian Fisher\, Applied Physics\, Stanford University\n\ nTitle: In-plane electronic anisotropy of underdoped iron-based superconduc tors\n\nAbstract: Common to the high Tc cuprates\, superconductivity in th e Fe arsenides and related compounds is associated with suppression of an a ntiferromagnetic ground state. On the underdoped side of the phase diagram \, in addition to the antiferromagnetic transition\, the materials also suf fer a phase transition that breaks the 4-fold rotational symmetry of the hi gh-temperature crystal structure\, this occurring at either the same or hig her temperature than the Neel transition. Emerging evidence based on measur ements of detwinned single crystals reveals a dramatic in-plane electronic anisotropy associated with this nematic transition\, and a large nematic su sceptibility for temperatures extending well above the transition. LAST-MODIFIED:20230127T204946Z LOCATION:Rm. 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120514T154500Z DTEND:20120514T163000Z DTSTAMP:20260828T094430Z UID:43s1fg4n32edskmfariobhqphk@google.com CREATED:20120510T210159Z LAST-MODIFIED:20230127T204233Z LOCATION:1305 F "New Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121119T173000Z DTEND:20121119T183000Z DTSTAMP:20260828T094430Z UID:n1t08p9elgqp9h89hbe4c4p32s@google.com CREATED:20121107T160500Z DESCRIPTION:Speaker: Wilhelm Zwerger\, Technische Universität München\nTit le: Scale Invariance in Atomic Physics: from Efimov states\nto Fermions at Unitarity.\nAbstract: The talk will provide an introduction to two\nexampl es in ultracold atom physics where\nscale invariance plays an important rol e: \nthree-body Efimov states of bosonic atoms\nand Fermions at infinite sc attering length.\nWe discuss the issue of an apparently 'universal'\nthree- body parameter in the Efimov context\nand thermodynamic properties as well as RF-spectra and\ntransport of the unitary Fermi gas. \n LAST-MODIFIED:20230127T204326Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Wilhelm Zwerger TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131104T213000Z DTEND:20131104T223000Z DTSTAMP:20260828T094430Z UID:p1hadjofnid803k72r5udak4uo@google.com CREATED:20131024T185635Z DESCRIPTION:Title: Modeling the Earth's Space Environment System\n\nSpeaker Name: Alex Glocer\n\nSpeaker Institution : Goddard Space Flight Center\n\n Notes: Tea and Cookies 4:15-4:30 pm\n\nAbstract : The Earth's space environ ment is comprised of regions with vastly different spatial and temporal sca les\, characteristic energies\, and features. As a result\, numerous modeli ng approaches using fluid and kinetic formalisms have sprung up tailored to each specific region. Further complicating our picture is the simple fact that each part of the space environment does not exist in isolation\, but i s rather a part of a complex system. This presentation will cover a range o f our recent modeling studies treating each part of system from the solar w ind-magnetopause interaction\, ring current and radiation belt response\, a nd magnetosphere-ionosphere coupling.\n LAST-MODIFIED:20230127T204518Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130220T160000Z DTEND:20130220T173000Z DTSTAMP:20260828T094430Z UID:v948itfni8p1mth7pgqqn56jdc@google.com CREATED:20130211T164505Z DESCRIPTION:Title: Topological States in Correlated Systems: From Weyl Sem imetals to\nTopological Phases of Interacting Bosons\n\nSpeaker Name: Ashv in Vishwanath\n\nSpeaker Institution: UC Berkeley\n\nAbstract: I will di scuss novel topological phases beyond the well-known topological insulators of free fermions. These include Weyl semimetals\, which may be considered topological semi-metals since they exhibit 'Fermi arc' surface states and an unusual electromagnetic response. Possible materials realizations will b e also be proposed. Next\, I will talk about recent theoretical breakthroug hs in identifying two and three-dimensional topological phases that only ap pear in interacting systems\, but which are close analogs of free fermion t opological insulators. Realizations in bosonic or spin systems will be dis cussed\, along with prospects for creating such states in cold atom systems .\n\n\n\n LAST-MODIFIED:20230127T204308Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120216T183000Z DTEND:20120216T190000Z DTSTAMP:20260828T094430Z UID:fbp6prc9hv74s65mi7r96dr7o0@google.com CREATED:20120209T205250Z LAST-MODIFIED:20230127T204552Z LOCATION:Room 1305F (the new Toll Room) Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101111T190000Z DTEND:20101111T200000Z DTSTAMP:20260828T094430Z UID:pisqc0j3ge69l1lem3c8pqtbug@google.com CREATED:20101014T144240Z DESCRIPTION:[Title] "Higgs Physics and Precision Tests in Warped Extra Dime nsions" \n[Speaker] Florian Goertz\n[Institution] Johannes Gutenberg Univer sity \n LAST-MODIFIED:20230127T205222Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100201T173000Z DTEND:20100201T183000Z DTSTAMP:20260828T094430Z UID:57frbk5nirm6hke3llquubbg4g@google.com CREATED:20100119T163306Z DESCRIPTION:Title : Quantum Control of Mesoscopic Spin Ensembles\nSpeaker N ame: Ivan Deutsch\nSpeaker Institution : University of New Mexico\nAbstract : Control of complex quantum systems has applications in many-body physics \, quantum information processing\, and high-precision metrology. Mesoscopi c ensembles of cold atomic spins are an ideal testbed for such explorations \, given the growing quantum-control toolbox. In a cigar-shaped trap\, when the ensemble is optically thick on resonance\, the spins coherently couple to the polarization state of a paraxial laser probe. The photons serve as a “quantum bus” that transfers quantum correlations between atoms and entan gles them. Spin-squeezed states based on this mechanism have recently been produced\, representing an important step toward more complex control. In t his seminar I will discuss new approaches to achieving more sophisticated a nd general control\, including unitary evolution through coherent optical f eedback and quantum erasure\, exponential squeezing via phase matching\, an d the production of Schroedinger kittens via heralded scattering of single photons.\n LAST-MODIFIED:20230127T205300Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T193000Z DTEND:20220420T203000Z DTSTAMP:20260828T094430Z UID:7sefgkufo0qsu858v9of9c66mt@google.com CREATED:20220125T164904Z DESCRIPTION:Daniel Andruczyk\, University of Illinois
      Can the Helium Ash Problem be Solved Using Flowing Liquid L ithium?

      One of the challenges that future nuclearfusion dev ices will have is how to remove the helium "ash" that isgenerated from the fusion reaction\, this will be important for mostfusion reactions\, DT\, DD and PB11 . Though helium is integral toheating and maintaining a burning fusion plasma\, eventually it willhave to be removed [1]. Its interaction w ith solid surfaces liketungsten can cause problems. It can be either retain ed within thesurface causing defects and eventual failure\, but also create smalltendrils called fuzz which can be source of dust and impurities intot he plasma. However\, the biggest issue is that once the helium losesits ene rgy to the plasma it will be come cold as it interacts with asurface\, and it becomes an impurity and recycling gas. What this doesis provides a path for energy losses from the core plasma since nowthe energy is going into he ating cold atoms at the plasma edge andthis cause steep temperature and pre ssure gradients that causeinstabilities and plasma collapse. Back in the mi d 2000's it wasdemonstrated at the Center for Plasma Material Interactions (CPMI) onthe Flowing Lithium Retention Experiment (FLiRE) device that flowi ngliquid lithium will trap and transport helium. This was performed withdif ferentially pumped chambers which were sealed off by a flowingliquid lithiu m plug and helium ion gun as the source [2-4]. With thefocus on plasma mat erial Interactions (PMI)\, CPMI acquired the formerWEGA stellarator from Ma x-Plank Institute for Plasma PhysicsGreifswald in 2014. This was done to ha ve our own toroidal fusiondevice that can operate in steady state to do PMI without the longwait to get time on other machines. The Hybrid Illinois De vice forResearch and Applications (HIDRA) is l = 2\, m = 5 classicalstellar ator that can operate steady state. Typical plasma dischargelength is from tpulse = 40 s - 1000 s\, with magnetic fields up to B0 =0.5 T. Heating on H IDRA is via ECRH with up to 26 kW of 2.45 GHzmicrowave magnetron sources. T ypical operating parameters for HIDRA ina standard discharge are Te <\;= eV\, Ti <\;= 3 eV and ne <\;= 5*10^18 m-3[5\,6]. Aside from PMI HIDRA i s also a grad educational resourceallowing graduate and undergraduate stude nts to learn the ropes offusion and train the next generations of fusion an d plasma scientistsand engineers [7-9]. Recently the first liquid lithium c ampaign wasundertaken on HIDRA. A specific material analysis tool (HIDRA-MA T) wasdeveloped for this\, where not only can liquid lithium be places onto asurface and exposed to a plasma\, but there are some basic surfaceanalyse s that can be performed on the samples as well including\, LIBS\,LIDA\, TDS and RGA [10\,11]. The Initial lithium campaign was performedin a helium pl asma where a droplet of ~100 mg of liquid lithium wasplaced on a tungsten s urface and exposed. The results were dramaticwhere the background neutral h elium\, the recycling gas\, essentiallydisappeared. The lithium was able to reduce the recycling by over 90%[12]. This seemed to back up the results t hat were found inFLiRE. Follow up experiments in the lithium evaporation ex perimental(LEEX) campaign where W-Li surfaces were exposed at differentdist anced from the plasma edge show that there is indeed a real effectwhen enou gh lithium can get into the plasma edge and ionize\, butwithout replacing t he core plasma. Future campaigns are planned tolook at the same effect in h ydrogen isotope plasmas (H and D) as wellmixtures of plasmas (H/D\, H/He\, D/He) and the effect on the plasmawith lithium. The plasma performance usin g lithium increaseddramatically. Temperatures were 50 eV <\;= Te <\;= 1 00 eV\, Ti up to 10 eV\,and densities only slightly dropping to ne = 2*10^1 8 m-3 due to thereduction in recycling and impurities. This talk will focus on theHIDRA results with lithium and helium\, as this has been the biggest surprise with it being accepted knowledge that Li and He would notinteract\ , this disproves this assumption. The implications for futureplasma facing surfaces (PFC) are significant as it potentially showsthat a fusion reactor work will only happen with some sort of flowingliquid lithium wall or dive rtor [1].

      References
      [1] A. de Castro et al.\, Physics of Plasma\ , 28 (2020) 050901.
      [2] J. P. Allain et al.\, Fusion Engineering and Des ign\, 61-62 (2002) 245.
      [3] M. Nieto et al.\, Journal of Nuclear Materia ls\, 350 (2006) 101.
      [4] R. Stubbers et al.\, Journal of Nuclear Materia ls\, 337-339 (2005) 1033.
      [5] D. Andruczyk et al.\, Fusion\, Science and Technology\, 68 (2015) 497.
      [6] D. Andruczyk et al.\, Physics Scripta\, T171 (2020) 014067.
      [7] D. Johnson et al.\, Fusion Engineering and Desi gn\, 128 (2018) 215.
      [8] R. Rizkallah et al.\, IEEE Transactions on Plas ma Physics\, 46(7) (2018) 2685.
      [9] R. Rizkallah et al.\, Physics of Pla smas\, 26 (2019) 092503.
      [10] A. Shone et al.\, Journal of Fusion Energy \, 39 (2020) 448.
      [11] A. Shone et al.\, Fusion Engineering and Design\, (2021) Submitted\, Under Review.
      [12] D. Andruczyk et al.\, Plasma Phys ics and Controlled Fusion\, (2022) Submitted. Under Review. LAST-MODIFIED:20230127T204230Z LOCATION:Virtual\; contact Marc Swisdak swisdak@umd.edu SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20090410T173000Z DTEND:20090410T190000Z DTSTAMP:20260828T094430Z UID:ug7ssmpbj9dcoqcvqbdeb8iros@google.com CREATED:20090331T202117Z DESCRIPTION:Title: Strongly coupled Quark-Gluon Plasma\nSpeaker: Edward Shu ryak\, State University of New York\, Stony Brook\nMore Information: The ab stract: Experiments made at Relativistic Heavy Ion Collider suggest new pha se of QCD\, known as Quark-Gluon Plasma\, to be a near-perfect liquid with small viscosity. The first 1/3 of the talk is about the main phenomena whic h lead to this conclusion. The next 2/3 is about attempts to explain it. One is based on electric-magnetic duality and the role of (color)magnetical ly charged quasiparticles - monopoles and dyons. Another duality is the so called AdS/CFT correspondence\, based on string theory /gravity methods\, which allows to address strongly coupled gauge theories. Two transport obs ervables -- the diffusion constant and viscosity -- obtained in both ways w ill be compared at the end. LAST-MODIFIED:20230127T204305Z LOCATION:Physics Building\, Room 1201 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Maryland Center for Fundamental Physics Colloquium TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20110915T173000Z DTEND:20110915T180000Z DTSTAMP:20260828T094430Z UID:ims4o186q9727hvs1dj73a47q4@google.com CREATED:20110914T203840Z LAST-MODIFIED:20230127T205204Z LOCATION:Rm. 1305F\, the (new) Toll Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Colloquium Refreshments TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110307T173000Z DTEND:20110307T183000Z DTSTAMP:20260828T094430Z UID:0tsj4jlc26glhnk1cg0m179bbg@google.com CLASS:PUBLIC CREATED:20110303T161100Z DESCRIPTION:Title: The 'Larmor clock' in silicon\nSpeaker: Ian Applebaum\, University of Maryland Physics\nAbstract: To study the possibilities of non -equilibrium spin-polarized electron transport in semiconductors\, my group has over the past several years utilized ballistic hot electron techniques for injection and detection in silicon\, arguably the "hydrogen atom" of s emiconductors from the spin point of view.[1] We have used these all-electr ical methods to achieve spin transport over truly macroscopic distances of even several millimeters\,[2] and used a "Larmor clock" spin precession tec hnique to recover complete time-of-flight transport distributions even with quasi-static measurements.[3] These results have enabled us to reveal the subtle differences between spin and charge transport characteristics in the same intrinsic bulk material\,[4\,5] and have recently been used to elucid ate the role of interfaces[6] and extrinsic impurity state spectrum[7] on s pin relaxation and dephasing[8]. Exciting future research along this direct ion is suggested for instance by initial results showing that our measureme nts are potentially capable of resolving subtleties of the spin-dependent b andstructure such as spin “hot-spots”.[9] \n\n\n[1] Ian Appelbaum\, B. Huan g\, and D.J. Monsma\, "Electronic measurement and control of spin transport in silicon"\, Nature 447\, 295 (2007).\n[2] B. Huang\, H.-J. Jang\, and Ia n Appelbaum\, "Geometric dephasing-limited Hanle effect in long-distance la teral silicon spin transport devices"\, Appl. Phys. Lett. 93\, 162508 (2008 ).\n[3] H.-J. Jang and Ian Appelbaum\, "Spin Polarized Electron Transport n ear the Si/SiO2 Interface"\, Phys. Rev. Lett. 103\, 117202 (2009).\n[4] B. Huang and Ian Appelbaum\, "Spin Dephasing in Drift-Dominated Semiconductor Spintronics Devices"\, Phys. Rev. B 77\, 165331 (2008).\n[5] Ian Appelbaum\ , "A Haynes-Shockley Experiment for Spin-Polarized Electron Transport in Si licon"\, Solid-State Electronics 53\, 1242 (2009).\n[6] B. Huang\, D.J. Mon sma\, and Ian Appelbaum\, "Coherent spin transport through a 350-micron-thi ck Silicon wafer"\, Phys. Rev. Lett. 99\, 177209 (2007).\n[7] Yuan Lu\, Jin g Li\, and Ian Appelbaum\, "Spin-Polarized Transient Electron Trapping in S i:P"\, arXiv:condmat/1101.1944 (2011).\n[8] Biqin Huang and Ian Appelbaum\, "The Larmor clock and anomalous spin dephasing in silicon"\, Phys. Rev. B Rapid Comm. 82\, 241202(R) (2010).\n[9] J. Fabian and S. Das Sarma\, Phys. Rev. Lett. 81\, 5624 (1998).\n\n LAST-MODIFIED:20230127T204719Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100128T160000Z DTEND:20100128T173000Z DTSTAMP:20260828T094430Z UID:fgm9p7v0vloir6m46gg4endtr8@google.com CLASS:PUBLIC CREATED:20100108T174714Z DESCRIPTION:SPEAKER: Anastasios Taliotis\n\nAFFILIATION: The Ohio State Uni v.\, Columbus\n\nTITLE: Heavy-Ion Collisions from AdS/CFT\n\nABSTRACT: The Stress-Energy (SE)\, which is produced in heavy ion \ncollisions\, is a us eful quantity. It provides information indicating \nwhether the produced ma tter thermalizes and becomes Quark-Gluon \nPlasma (QGP).\n\nWe investigate the SE tensor produced at early proper times after\nthe collision using too ls from AdS/CFT. In particular\, we calculate the\nSE tensor of the gauge t heory by reconstructing the corresponding\nmetric tensor in the dual theory .\n\nAn expansion of the SE tensor in powers of the proper time has been\nc onstructed. It has shown to correspond on the gravity side to a\nperturbati ve expansion of the metric in graviton exchanges. The\ncalculation of the L eading Order (LO) term in the graviton\nexchanges was initially performed a nd reproduced earlier results in the\nliterature. The Einstein equations ar e solved by using\, as initial\nconditions\, two heavy ions moving toward e ach other along the light\ncone. These are modeled as two shock waves colli ding in an AdS5\nbackground. It is found that they stopped after the collis ion. In\nthe gauge theory side this would imply a complete nuclear stoppin g due\nto strong coupling effects\, likely leading to Landau hydrodynamic. The\nstopping is not instantaneous.\n\nIn order to confirm our conclusions\ , we calculated higher terms in\nthe expansion and it has been realised tha t the SE tensor of the\nproduced medium is encoded in a single function. In addition\, the problem \nof proton-Nucleus was solved. Here\, through a mo re accurate calculation it \nwas verified that the proton stops probably yi elding to Landau \nhydrodynamics and\, consequently\, confirmed the conclus ions for this large \ncoupling approach of the problem. LAST-MODIFIED:20230127T205017Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100528T163000Z DTEND:20100528T173000Z DTSTAMP:20260828T094430Z UID:514t35l7lp2vfhaivf9qt2eako@google.com CREATED:20100518T190756Z DESCRIPTION:SPEAKER: Jonathan Carroll\n\nAFFILIATION: CSSM\, The Univ of A delaide\, Australia\n\nTITLE: QMC as a Model of Dense Matter: From Finite Nuclei to Hybrid Stars\n\nABSTRACT: The QCD phase diagram at \n$\\{\\mu > 0\,T \\ge 0\\}$ is largely unknown and particularly inaccessible to even la ttice QCD simulations. One method for investigating the $\\mu \\gg 0$ regio n is effective field theory using mean-field meson potentials. The EMC effe ct indicates that the quark structure of the nucleon is modified in an esse ntial way in a nuclear medium\, and the Quark-Meson Coupling (QMC) model pr ovides a simple yet very successful description of meson-baryon interaction s with feedback to the quark structure of the baryons. With QMC predictions for finite nuclei -- and\, in particular\, finite hypernuclei -- proving a ccurate\, our attention turns to the equation of state of dense matter and the structure of 'hybrid stars'\; neutron stars with proportions of hyperon ic- or quark-matter. Using such an equation of state as \nan input to the T olman-Oppenheimer-Volkoff equation allows us to construct models of stars \ nand compare predicted mass and radius with pulsar observations. I will di scuss the origins and \npredictions of QMC ranging from finite nuclei to hy brid stars and our recent progress in extending \nthis model beyond the mea n-field approximation to Hartree--Fock.\n\n\n\n LAST-MODIFIED:20230127T203946Z LOCATION:Physics Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131002T163000Z DTEND:20131002T173000Z DTSTAMP:20260828T094430Z UID:nj1hi2gut2n1q9uca05tj7jo4g@google.com CREATED:20130918T144721Z DESCRIPTION:Title: Scaling Dimensions in AdS/QCD and the Gluon Field Streng th Propagator\n\nSpeaker: Josh Powell\, Duke University\n\nAbstract: We der ive the scaling dimension of antisymmetric tensor operators in the boundary theory of the AdS/CFT correspondence using a functional integral represent ation of the boundary-to-boundary propagators of their dual fields in the b ulk. We then apply this technique to AdS/QCD in which the bulk metric is wa rped\, resulting in non-constant scaling dimensions. In particular\, we com pute the two-point correlation function of gluon field strength operators\, for which it is prerequisite to know the flow of the anomalous scaling dim ension under rescaling. The results are in very good agreement with quenche d lattice QCD data\, thus conrming the functional form of the scaling dimen sion. LAST-MODIFIED:20230127T204333Z LOCATION:2202 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111205T164500Z DTEND:20111205T173000Z DTSTAMP:20260828T094430Z UID:lt9f7eafe7bbltt0m2mvsqqqvc@google.com CREATED:20111129T150023Z LAST-MODIFIED:20230127T204156Z LOCATION:Physics 1305F"New Toll Room" SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110301T210000Z DTEND:20110301T220000Z DTSTAMP:20260828T094430Z UID:03ufsp953pfm3lp4vitkk8h34o@google.com CREATED:20110225T161528Z DESCRIPTION:Speaker: Carl Wieman\, Office of Science and Technology Policy\ nLangenberg Lecture: Perspectives on Education\n LAST-MODIFIED:20230127T204401Z LOCATION:Phys 1412 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Langenberg Lecture/Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131107T133000 DTEND;TZID=America/New_York:20131107T143000 DTSTAMP:20260828T094430Z UID:pcgc6qai2rdvjsi5hf8uhsahpk@google.com RECURRENCE-ID;TZID=America/New_York:20131107T133000 CREATED:20130816T163136Z DESCRIPTION:Title: From Quantum Chromodynamics to Nuclear Physics\n\nSpeake r: Raul Briceno\, Jefferson Lab\n\nAbstract: With lattice QCD calculations in mind\, I will briefly motivate the study of two and three particle syst ems in a finite volume. I will review recent progress towards the extractio n of scattering parameters directly from the finite volume spectrum\, both in the scalar and nuclear sector. I will present predictions for the two-nu cleon spectrum at the physical pion mass and pay close attention to the deu teron. The results demonstrate that in a finite volume\, the sensitivity of the deuteron binding energy to the tensor force is enhanced and that the m ixing angle in the 3S1-3D1 channel can be extracted by from lattice QCD cal culations of the deuteron binding energy. LAST-MODIFIED:20230127T204526Z LOCATION:2202 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081119T160000Z DTEND:20081119T170000Z DTSTAMP:20260828T094430Z UID:5kn9j1l2488clv98t4abfo0n5g@google.com CREATED:20080922T185910Z DESCRIPTION:Speaker: Ming Zheng\, Dupont \nTitle: Carbon Nanotube / DNA Int eraction: Fundamentals and Applications LAST-MODIFIED:20230127T205021Z LOCATION:Chemistry Building\, Room 0112 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physical Chemistry/Chemical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120424T160000Z DTEND:20120424T171500Z DTSTAMP:20260828T094430Z UID:vke6gbg1a2jvdflb28itgo7rb0@google.com CREATED:20120220T155521Z DESCRIPTION:"Laser Acoustics and Other Underwater Intense Laser Application s"\nDr. Ted Jones\nNaval Research Laboratory LAST-MODIFIED:20230127T204119Z LOCATION:1207 ERF SEQUENCE:0 STATUS:CONFIRMED SUMMARY:AppEl Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111111T180000Z DTEND:20111111T190000Z DTSTAMP:20260828T094430Z UID:ronvkcdad76b69ddrh9bsn0cuk@google.com CREATED:20111107T150820Z DESCRIPTION:Title : Atomistic Simulation and Analysis of Microstructure Evo lution in Crystalline Materials\nSpeaker Name: Talid Sinno\nSpeaker Institu tion : University of Pennsylvania\nAbstract : The atomistic analysis of cry stalline material properties is often complicated by high temperature entro pic effects that can lead to significant deviations from ground state predi ctions. Using crystalline silicon as a model material\, a theoretical/compu tational framework for thermodynamic analysis of crystalline microstructure is presented. The essence of the approach is to map out a portion of the energy landscape associated with a phenomenon of interest\, and then use th e landscape features to probe key mechanisms.\nWe consider two primary situ ations to demonstrate the utility of this approach. First\, the physics of point defect clustering at elevated temperature is addressed. Defect clus ters\, such as nanovoids and self-interstitial precipitates\, play importan t roles in establishing the quality of crystalline silicon for both microel ectronic and photovoltaic applications. We show how entropic contributions arising from vibrational and configurational degeneracy lead to subtle but important changes in the thermodynamics of these species. In the latter p art of the presentation\, the phenomenon of crystal melting is addressed. Here\, it is shown that the energy landscape framework provides a powerful setting for analyzing the microscopic mechanisms of melting. In particular \, we consolidate melting behavior in several different geometries and show how interfacial curvature influences melting at the atomic scale.\n LAST-MODIFIED:20230127T204931Z LOCATION:2110 Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090924T161500Z DTEND:20090924T171500Z DTSTAMP:20260828T094430Z UID:9t3p2tr8gsf7kibupvfis6pveg@google.com CREATED:20090921T172249Z DESCRIPTION:Title: How Is the Primary T Cell Response Regulated?\nSpeaker: Doron Levy\, Department of Mathematics and CSCAMM\, University of Maryland LAST-MODIFIED:20230127T204223Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130315T130000 DTEND;TZID=America/New_York:20130315T140000 DTSTAMP:20260828T094430Z UID:63vbbgdpk77qe40rjng87laic4@google.com RECURRENCE-ID;TZID=America/New_York:20130315T130000 CREATED:20130108T151219Z DESCRIPTION:Title : Advanced Nanostructured Thermoelectric Materials for Wa ste Heat Recovery\n\nSpeaker Name: Yue Wu\n\nSpeaker Institution : Departme nt of Chemical Engineering\, Purdue University\n\nAbstract : The rapid deve lopment of thermoelectric materials in the past decade has provided a possi bility of directly converting waste heat back to electricity based on the S eebeck effect. In the past three years\, we have developed a transformative approach to pioneered low cost and scalable solution-phase growth methods to mass produce thermoelectric nanowires and nanowire heterostructures to m atch the physical and economic magnitudes of energy use and economical ente rtainment in the manufacture/recycling. These nanostructured thermoelectric materials show a significantly enhanced performance compared to the bulk c rystals based on the quantum confinement and energy filtering. LAST-MODIFIED:20230127T204752Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130415T180000Z DTEND:20130415T193000Z DTSTAMP:20260828T094430Z UID:tqfdjc58d1813cif7vvu528rh8@google.com CREATED:20130117T143502Z DESCRIPTION:Title: Classifying fractionalization: symmetry classification of gapped Z2 spin liquids in two dimensions\n\nSpeaker Name: Michael Herm ele\n\nSpeaker Institution: University of Colorado\, Boulder\n\nAbstract: Quantum number fractionalization is a remarkable property of topologically ordered states of matter\, such as fractional quantum Hall liquids\, and q uantum spin liquids. For a given type of topological order\, there are gene rally many ways to fractionalize the quantum numbers of a given symmetry. W hat does it mean to have different types of fractionalization? Are differen t types of fractionalization a universal property that can be used to disti nguish phases of matter? In this talk\, I will answer these questions\, foc using on a simple class of topologically ordered phases\, namely two-dimens ional gapped Z2 spin liquids\, and I will present a symmetry classification of these phases. I will also discuss efforts in progress to find microsco pic models realizing different symmetry classes. LAST-MODIFIED:20230127T205244Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110511T200000Z DTEND:20110511T213000Z DTSTAMP:20260828T094430Z UID:qr6gog1h93sbfat944p5p0shvg@google.com CREATED:20110510T193920Z DESCRIPTION:Title: "To Be Announced"\nSpeaker: Peter Fisher\nInstitution: M IT LAST-MODIFIED:20230127T205230Z LOCATION:1201 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Canceled: HEP/Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090312T200000Z DTEND:20090312T210000Z DTSTAMP:20260828T094430Z UID:qqnr724e0sgjencs7k81774s3o@google.com CREATED:20090303T202753Z DESCRIPTION:Title: Reconnection in a screw pinch cylinder with axial conduc ting boundary conditions\nSpeaker: Dr. Yi-Min Huang\, University of Wiscons in LAST-MODIFIED:20230127T204259Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100222T181500Z DTEND:20100222T194500Z DTSTAMP:20260828T094430Z UID:95p7btd856bo1ge83jcg3ln3j0@google.com CREATED:20100217T204909Z DESCRIPTION:Title: Developing\, Modeling\, and Representing Domain-specific \nExpertise via Epistemic Games: A Measurement Person's View\nSpeaker: Andr e Rupp\, Department of Measurement\, Statistics\, and\nEvaluation\, Univers ity of Maryland\, College Park\n\n\nAbstract. Epistemic games have been pro moted as innovative digital\ntools to promote the development of discipline -specific expertise in a\nparticular domain such as scientific writing or u rban planning. The\ndata structures that arise from these games are reason ably complex in\nthat they are of a longitudinal nature\, collected from a relatively\nsmall number of learners\, contain multiple contextual dependen cies\,\narise from highly interactive tasks that require complex performanc e\nproducts\, and are used to make inferences about association structures\ nand intra-individual development. Even though many latent-variable\nmethod s exist to model individual aspects of such data\, there is no\nsingle off- the-shelf method available that can be used to analyze\nthese data reliably .\n\nIn this presentation\, I describe some of the current thinking at the\ nintersection of epistemic game development\, evidence-centered design\,\na nd diagnostic measurement to characterize some of the modeling\nchallenges that await creative solutions in this area. Moreover\, I\nwill discuss our own efforts to analyze the statistical properties of\na particular non-para metric method called epistemic network analysis\nthat has been proposed by researchers as a potential mechanism to\nrepresent developing expertise.\n LAST-MODIFIED:20230127T204815Z LOCATION:1303 Physics Building SEQUENCE:4 STATUS:CONFIRMED SUMMARY:PERG Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091019T203000Z DTEND:20091019T213000Z DTSTAMP:20260828T094430Z UID:cui8k3kg6avi8m0tepm5dmt20g@google.com CREATED:20091006T130221Z DESCRIPTION:Title : What's So Peculiar about the Current Sunspot Minimum\nS peaker Name: Neil Sheeley\nSpeaker Institution : NRL\nAbstract : Traditiona lly\, solar physicists become anxious during sunspot minimum as they await the high-latitude sunspot groups of the new cycle. Now\, the Sun is slowly emerging from an extended sunspot minimum with conditions not seen in seve ral cycles. In this talk\, I will describe some of the characteristics of the current minimum\, including its depth\, its extended duration\, its wea k polar magnetic fields\, and its small amount of open flux. Flux-transpor t simulations suggest that these characteristics are a consequence of tempo ral variations of the Sun's large-scale meridional circulation. They also raise the question of whether the next sunspot maximum may be a relatively small one. LAST-MODIFIED:20230127T204315Z LOCATION:CSS Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Cosmic Ray Astrophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091207T153000Z DTEND:20091207T163000Z DTSTAMP:20260828T094430Z UID:7vuof1stf1pcvseld1obr4heoc@google.com CREATED:20091207T135214Z DESCRIPTION:Title: Semiconductor Quantum Dot-Microcavity Systems\nSpeaker: Dr. Hyochul Kim\nUniversity of California\, Santa Barbara\nAbstract:\nSelf- assembled InAs quantum dots (QDs) embedded in GaAs photonic crystal cavitie s and oxide apertured micropillar cavities are promising systems for cavity quantum electrodynamics (QED) experiments and quantum information studies. The first topic is the demonstration of strong coupling between a single QD and a photonic crystal cavity mode. For the second topic\, a GaAs photon ic crystal membrane structure has been grown which has two QD layers within the membrane. By applying a voltage across only one of the QD layers the Q D emission frequency of one QD layer can be tuned independently of the othe r. The next phase of this research will be to use this structure to couple two QDs to a single cavity mode. The third topic concerns a proposed method to detect a single electron spin state in a QD by exploiting QD-cavity int eraction effects in micropillar cavities. This requires highly efficient co upling\, still within the weak-coupling limit of cavity QED\, of photons in an oxide-apertured microcavity to embedded charge controlled QDs.\n \n\n LAST-MODIFIED:20230127T204048Z LOCATION:Energy Research Facility\, Rm. 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110503T150000Z DTEND:20110503T161500Z DTSTAMP:20260828T094430Z UID:l7bt68he5a04p86ll3dc5f0fj0@google.com CREATED:20110415T134433Z DESCRIPTION:Title : Water in Confinement: Theoretical and Computational Per spectives\nSpeaker Name: Pablo Debenedetti\nSpeaker Institution : Princeton University\nAbstract : The behavior of water in confining geometries with characteristic size in the nm range is of interest in a wide range of scien tific fields and technical applications. Examples include biological self-a ssembly\, the design of self-cleaning surfaces\, and ice nucleation in clou ds. Theoretical and computational investigations of water in nano-scale con finement by inorganic and biological surfaces shed light on the roles of su rface chemistry\, geometry and heterogeneity on water structure\, dynamics and phase behavior over broad ranges of temperature and pressure. I will al so discuss the application of path sampling methods to probe the evaporatio n dynamics of water confined by hydrophobic surfaces. LAST-MODIFIED:20230127T204546Z LOCATION:Room 2110 Chemical and Nuclear Engineering Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Chemical & Biomolecular Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101004T200000Z DTEND:20101004T213000Z DTSTAMP:20260828T094430Z UID:csdrn94veuvucllkj4tr4985s8@google.com CREATED:20100927T144503Z DESCRIPTION:Title : A New Method for Measuring the Energy Landscape for Unf olding Transitions of Biopolymers.\nSpeaker Name: Professor Arthur LaPorta\ nSpeaker Institution : University of Maryland\nNotes: Refreshments at 3:45p m\n LAST-MODIFIED:20230127T204554Z LOCATION:Room 1116\, IPST Building\, Bldg #Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091120T160000Z DTEND:20091120T173000Z DTSTAMP:20260828T094430Z UID:h59mkf8vb2hl0n6lfrjagm1r40@google.com CREATED:20091111T142943Z DESCRIPTION:Title : Kasteleyn transition of spin ice in an applied magnetic field\nSpeaker Name: Stephen Powell\nSpeaker Institution : University of M aryland\n LAST-MODIFIED:20230127T205019Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110301T181500Z DTEND:20110301T193000Z DTSTAMP:20260828T094430Z UID:6jqems51jb8k6acadecrpq3jl8@google.com CREATED:20110217T145530Z DESCRIPTION:Title : Surface-Confined Intermixing Phenomena and Surface Nano scale Pattern Formation.\nSpeaker Name: Professor Michael Michailov\nSpeake r Institution : Bulgarian Academy of Sciences\nNotes: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to which all are w elcome\, departing from Room 1108 about five minutes after 12:00 (Noon). LAST-MODIFIED:20230127T205237Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090205T190000Z DTEND:20090205T200000Z DTSTAMP:20260828T094430Z UID:lh04totaeqvkaoi6dpd60gof1s@google.com CREATED:20090130T203752Z DESCRIPTION:Title: Improved Assembly of the Bos taurus genome.\nSpeaker: Al eksey Zimin\, Institute for Physical Science and Technology\, University of Maryland LAST-MODIFIED:20230127T203956Z LOCATION:Biomolecular Science Building\, Room 3118 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130326T150000Z DTEND:20130326T163000Z DTSTAMP:20260828T094430Z UID:dlfqkmnm4b8njed16b50tdh3t8@google.com CREATED:20130211T170039Z DESCRIPTION:Title: Quantum magnetism in ongoing ultracold molecule and ion experiments\n\nSpeaker Name: Kaden Hazzard \n\nSpeaker Institution: Univer sity of Colorado at Boulder\, JILA\, and NIST\n\nAbstract: I will discuss our theoretical results on strongly correlated quantum magnetism in ultrac old systems\, especially far-from-equilibrium. I will discuss our collabor ation with Penning trap ion and ultracold molecule experiments at JILA and NIST-Boulder. These systems' capacities for simulating strongly correlated quantum magnetism have exploded in the last couple years. Ion experiment s can now coherently work with 100's of ions\, while control ~15 ions has r eached exquisite levels. For molecules\, sufficient coherence of the rotat ional states\, which are used to mimic spin-1/2's\, has been experimentally demonstrated. I will describe how far-from-equilibrium dynamics in these experiments is revealing signatures of quantum magnetism and the theoretica l methods we have developed to describe them. I also will explain interest ing aspects of the dynamics: creating metrologically useful entangled state s is just one example. LAST-MODIFIED:20230127T204344Z LOCATION:Phys 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC/JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101115T150000 DTEND;TZID=America/New_York:20101115T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20101115T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] "It's On: Using ATLAS' First Results from the First Res ults from Jets and Missing Energy Search" \n[Speaker] Jay Wacker\n[Institut ion] SLAC\, Stanford University \n LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100225T171500Z DTEND:20100225T181500Z DTSTAMP:20260828T094430Z UID:oj1hapusu8u8rjfbh3al13e3l0@google.com CREATED:20100125T155715Z DESCRIPTION:Title : Applied Dynamics Seminar - Decision Making and Collect ive Behavior in Cell Migration\nSpeaker Name: Wolfgang Losert\nSpeaker Inst itution : Physics\,IREAP - University of Maryland\n LAST-MODIFIED:20230127T204934Z LOCATION:1207 Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091106T160000Z DTEND:20091106T173000Z DTSTAMP:20260828T094430Z UID:r41olsjv7hf5ilbujrv5b4u3ao@google.com CREATED:20091102T215646Z DESCRIPTION:Title : Cold polar molecule: from one-\, two-\, to many-particl e physics\nSpeaker Name: Daw-Wei Wang\nSpeaker Institution : National Tsing -Hua University\, Taiwan\nNotes: website:\nhttp://www.physics.umd.edu/cmtc/ seminars.html LAST-MODIFIED:20230127T204407Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090205T190000Z DTEND:20090205T200000Z DTSTAMP:20260828T094430Z UID:8dicick4o53k1u6ugcr34l8n88@google.com CREATED:20090202T162630Z DESCRIPTION:Title: New techniques for calculating long-range atomic interac tions\nSpeaker: Jim Mitroy\, Charles Darwin University LAST-MODIFIED:20230127T204628Z LOCATION:Radiation Physics\, B105 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Electron and Optical Physics Division Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081031T150000Z DTEND:20081031T160000Z DTSTAMP:20260828T094430Z UID:kj2fqb2ba5pkpcluu2lss01b74@google.com CREATED:20081024T185243Z DESCRIPTION:Title: Analyzing the Assembly and Mechanics of the Molecular Bu ilding Blocks of Life\nSpeaker: Wonmuk Hwang\, Texas A&M University\nMore I nformation: flevine@umd.edu/x50379 LAST-MODIFIED:20230127T204203Z LOCATION:Chemical and Nuclear Engineering Bldg.\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bioengineering Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090910T161500Z DTEND:20090910T171500Z DTSTAMP:20260828T094430Z UID:4q2kuqormor2cf4d46emrqv7p4@google.com CREATED:20090904T200839Z DESCRIPTION:Two 20-minute Talks\n\nSpectral Properties of Networks with Com munities\nSanjeev Chauhan\, University of Maryland\n\nand\n\nLarge Coupled Oscillator Systems with\nHeterogeneous Interaction Delays\nWai Shing Lee\, University of Maryland\n\n\n\n*Pizza and drinks will be available for purch ase.\n LAST-MODIFIED:20230127T204136Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090908T171500Z DTEND:20090908T184500Z DTSTAMP:20260828T094430Z UID:c5v5fg2111e7tlapsdkmlovt00@google.com CREATED:20090902T125823Z DESCRIPTION:Title : Advancing the Field of Self-Assembly Using Old Molecule s and Nanoparticles.\nSpeaker Name: Srinivasa Raghavan\nSpeaker Institution : University of Maryland\nNotes: As in the past\, each seminar will be pre ceded by an Informal Cafeteria Lunch to which all are welcome\, departing f rom Room 1108 about five minutes after \n12:00(Noon).\n\nFor further inform ation contact:\nProfessor Christopher Jarzynski\, cjarzyns@umd.edu\nProfess or John Weeks\, jdw@umd.edu\n LAST-MODIFIED:20230127T205214Z LOCATION:1116 IPST Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20081103T150000Z DTEND:20081103T160000Z DTSTAMP:20260828T094430Z UID:9rd2mnfuhd6jfbcgj9f3u1afl8@google.com CREATED:20081029T150938Z DESCRIPTION:Title: "Theoretical Approaches to the Transport Properties of N anostructures"\nSpeaker: Jay Deep Sau\, U.C. Berkeley\nMore Information: cm tc.assistant@gmail.com LAST-MODIFIED:20230127T204202Z LOCATION:Physics Building\, Room 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Condensed Matter Theory Center Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090403T170000Z DTEND:20090403T180000Z DTSTAMP:20260828T094430Z UID:p66lk2riucc23urgsahkhhkj7s@google.com CREATED:20090325T191117Z DESCRIPTION:Title: The Direct Patterning of Organosilicate Materials by Nan oimprint Lithography\nSpeaker: Dr. Christpher L. Soles\, National Institute of Standards and Technology (NIST) LAST-MODIFIED:20230127T204303Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090415T150000Z DTEND:20090415T160000Z DTSTAMP:20260828T094430Z UID:8v3uep0uc46mj3eakj229ra394@google.com CREATED:20090409T192429Z DESCRIPTION:Title: Information fusion for content-based multimedia database retrieval\nSpeaker: Josef Kittler\, Centre for Vision\, Speech and Signal Processing\, University of Surrey LAST-MODIFIED:20230127T204213Z LOCATION:Kim Building\, Room 1107 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Distinguished Seminar Series on Vision TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090224T160000 DTEND;TZID=America/New_York:20090224T170000 DTSTAMP:20260828T094430Z UID:oiherbvqgudjapqso6ocvvvkmc@google.com RECURRENCE-ID;TZID=America/New_York:20090224T160000 CREATED:20090126T164931Z DESCRIPTION:Speaker: Raman Sundrum\, Johns Hopkins University\nTitle: Extra Dimensions and the LHC LAST-MODIFIED:20230127T204241Z LOCATION:Physics Building\, Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110104T173000Z DTEND:20110104T190000Z DTSTAMP:20260828T094430Z UID:06lep1f6trhfc1goeoi25u9moo@google.com CREATED:20101222T182814Z DESCRIPTION:SPEAKER: Emanuele Mereghetti - Univ of Arizona\, Tucson\nTITLE : T-violation in nuclear physics. An effective approach.\nABSTRACT: Elect ric dipole moments (EDMs) of elementary particles provide stringent bounds on new sources of time-reversal (T) violation beyond the phase of the Cabib bo-Kobayashi-Maskawa matrix. In the next few years\, several experiments w ill improve the current bound on the neutron EDM by two orders of magnitud e\, and new techniques are being developed to study the EDMs of charged par ticles\, like the proton and the deuteron\, with comparable sensitivity.\nA positive signal in the next generation of experiments will be a clear indi cation of new physics. However\, the possibility to use the experimental ev idence to pinpoint the source of T-violation relies on our ability to contr ol the strong interaction\, and\, in this regard\, Chiral Perturbation Theo ry\, the low-energy Effective Field Theory of QCD\, constitutes a powerful tool to follow the clues from EDM experiments back to the dominant mechanis m(s) of T-violation at high energy.\n\nWe construct the effective chiral La grangian involving hadronic and electromagnetic interactions originating fr om the lowest dimension T-violating operators that can be added to the QCD Lagrangian\, the dimension-four QCD theta term and dimension-six quark EDM\ , chromo-EDM and Weinberg three-gluon operators. We use such Lagrangian to compute in a unitary framework the nucleon EDM at next-to-leading order in the chiral expansion\, and the deuteron EDM and Magnetic Quadrupole Moment at leading order. We discuss how different sources of T-violation give ris e to qualitative different relations between nuclear T-odd observables\, op ening up the possibility to effectively discriminate between different mech anism of T-violation. LAST-MODIFIED:20230127T204831Z LOCATION:Physics\, Rm. 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:TQHN Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091028T170000Z DTEND:20091028T183000Z DTSTAMP:20260828T094430Z UID:tcp4cu0qmg1tm4dcvmntlbkvo4@google.com CREATED:20091015T171306Z DESCRIPTION:Title : Measuring the Parity-Violating Neutron Spin rotation in Helium: The Neutron Spin Rotation Experiment\n\nSpeaker Name: Christopher Bass\nSpeaker Institution : National Inst. of Standards and Technology \, G aithersburg MD\n\nAbstract: A precision measurement of the parity-violatin g neutron spin rotation in helium due to the nucleon-nucleon weak interacti on has been performed at the NIST Center for Neutron Research. The measurem ent employed a beam of low energy neutrons passing through a liquid helium target system located between a neutron polarizer--analyzer pair. The magni tude of the parity-violating spin rotation was determined from measured cou nt asymmetries in the analyzer. The expected parity-violating spin rotation of \norder 10^-6 rad placed severe constraints on the apparatus design. In particular\, isolation \nof the parity-odd component of the spin rotation from the much larger Larmour precession \nrequired use of a nonmagnetic tar get system that allowed movement of the target helium \nupstream or downstr eam of a vertical precession coil\, which enabled us to take asymmetry diff erences to subtract background rotations. The design and performance of the apparatus used for this experiment will be described\, as well as prelimin ary results for the measurement\, and possible follow-up experiments with r educed statistical and systematic errors. LAST-MODIFIED:20230127T204022Z LOCATION:PHYS 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091005T163000Z DTEND:20091005T173000Z DTSTAMP:20260828T094430Z UID:ibia1iqoshhq4fep1vq6hmhu44@google.com CREATED:20090922T170035Z DESCRIPTION:Title : How does a quantum mechanical system thermalize?\nSpeak er Name: David Weiss\, Pennsylvania State University\nAbstract : I will des cribe experiments with atoms in optical lattices that create effectively 1D Bose gases. These are the first experimentally observed integrable many-bo dy systems\, which means among other things that they can be exactly solved and that to a first approximation they do not thermalize\, as we have obse rved by making quantum Newton's cradles. The question we are now addressing is what happens when integrability is lifted. Does the gas thermalize\, or \, as in some classical systems\, is there some regime of non-integrability in which the system still does not thermalize? We think we are close to a definitive experimental answer\, but since it's still preliminary\, you'll have to come to my talk to hear it.\n LAST-MODIFIED:20230127T204809Z LOCATION:PHYS 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101108T150000 DTEND;TZID=America/New_York:20101108T160000 DTSTAMP:20260828T094430Z UID:qrlar01fk3un3k5nvhn1a3uod4@google.com RECURRENCE-ID;TZID=America/New_York:20101108T150000 CREATED:20100816T183106Z DESCRIPTION:[Title] Towards Characterizing Early LHC Data in Simple Terms: Recent Developments\n[Speaker] Philip Schuster\n[Institution] Perimeter Ins titute for Theoretical Physics\, Ontario\n[Abstract] TBA LAST-MODIFIED:20230127T204506Z LOCATION:Room 4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090413T203000Z DTEND:20090413T213000Z DTSTAMP:20260828T094430Z UID:vo5bd7rembtg2583psiq5ierrs@google.com CREATED:20090202T181001Z DESCRIPTION:Title: Particle Acceleration in Astrophysical Shocks\nSpeaker: Prof. Anatoly Spitkovsky\, Princeton University LAST-MODIFIED:20230127T204252Z LOCATION:CSS Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090313T170000Z DTEND:20090313T180000Z DTSTAMP:20260828T094430Z UID:fjrvh1pteup3smdk0fugjogv2k@google.com CREATED:20090309T142406Z DESCRIPTION:Title: One-Dimensional Physics in Individual Suspended Carbon N anotube\nSpeaker: Prof. Stephen B. Cronin\, University of Southern Californ ia LAST-MODIFIED:20230127T204319Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:MSE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100506T161500Z DTEND:20100506T171500Z DTSTAMP:20260828T094430Z UID:i0e6t1jq78q4ns4gs3hcqnovfg@google.com CREATED:20100125T160852Z DESCRIPTION:Title : Applied Dynamics Seminar - The Role of Network Topol ogy in the Dynamics Range of Excitable Systems\nSpeaker Name: Juan G. Restr epo\nSpeaker Institution : University of Colorado LAST-MODIFIED:20230127T204753Z LOCATION:Energy Research Facility 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Research in Electronics & Applied Science Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101007T161500Z DTEND:20101007T171500Z DTSTAMP:20260828T094430Z UID:2kj1k6b5q4kmqeosdb8l8spcuk@google.com CREATED:20101001T154249Z DESCRIPTION:Title: Connecting Period-doubling Cascades to Chaos\nSpeaker: P rof. Evelyn Sander\nGeorge Mason University (Mathematics) LAST-MODIFIED:20230127T205305Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120406T180000Z DTEND:20120406T213000Z DTSTAMP:20260828T094430Z UID:urt07i3ernloc4lckjbda2oq7c@google.com CREATED:20120313T132740Z DESCRIPTION:"Plasma Physics and Particle Acceleration"\nSchedule\n\n• 1:00 - 2:00 -- Catered Lunch in CSS Room 2316\n• 2:00 - 2:30 -- Julie McEnery -- The Fermi View of Blazars and Gamma-ray Bursts\n• 2:30 - 3:00 -- Jordan Go odman -- Cosmic Rays\, from Galactic to Ultra High Energy\; What Do We Know About Their Sources?\n• 3:00 - 3:30 -- Kara Hoffman -- Possible Sources of Ultrahigh Energy Neutrinos and Current Constraints\n• 3:30 - 4:00 -- Break (Snacks and Beverages)\n• 4:00 - 4:30 -- Jim Drake -- The Plasma Physics o f Particle Acceleration\n• 4:30 - 5:00 -- Jon McKinney -- GRMHD Simulations \, Jets\, and Reconnection\n• 5:00 - 5:30 -- Alice Harding -- Acceleration Processes in the Crab Nebula\n\nSome logistcal details follow:\nThe Symposi um will be held in Room 2324 of the Computer and Space Sciences Building. T his is the OLD wing of the building (closest to the construction). From th e main entrance\, take the stairs or elevator to the second floor. Proceed left or right to the end of the hallway. Signs will be posted directing y ou to the event. Google map. Please contact Susan Lehr for additional park ing information by Thursday\, April 5th.\n\nhttp://jsi.astro.umd.edu/jsi-mi ni-symposium.html\n LAST-MODIFIED:20230127T203950Z LOCATION:Room 2324 Computer and Space Sciences Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Mini-Symposium"Plasma Physics and Particle Acceleration" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20121107T190000Z DTEND:20121107T200000Z DTSTAMP:20260828T094430Z UID:k00omaglp00h5dvut58ulh5j10@google.com CREATED:20121031T152743Z DESCRIPTION:Topic: Kinetic Description of Social Dynamics: Fro m Consensus to Flocking. LAST-MODIFIED:20230127T205042Z LOCATION:CSIC Bldg\, Room 4122 (#406) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:SPECIAL EVENT (KI-net CONFERENCE) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120913T163000Z DTEND:20120913T173000Z DTSTAMP:20260828T094430Z UID:af9tmmlrmjlb70leuhc8dd1t0g@google.com CREATED:20120910T142813Z DESCRIPTION:Title: Dynamical Singularities in Online Learning and Adaptive Delayed-Feedback Control\nSpeaker: Prof. Asaki Saito\nFuture University Hak odate and JST PRESTO\nDepartment of Complex Systems and Astronomy LAST-MODIFIED:20230127T205224Z LOCATION:IREAP Conference Room (ERF 1207) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090824T123000Z DTEND:20090824T210000Z DTSTAMP:20260828T094430Z UID:lqf430abpdtpf0ebg6ou8o97qs@google.com CREATED:20090824T135207Z DESCRIPTION:Organizers: Cole Miller\, Chris Reynolds\, Manuel Tiglio\nFor m ore information\, visit: www.cscamm.umd.edu/programs/fsg09/ LAST-MODIFIED:20230127T204132Z LOCATION:CSIC Building\, Seminar Room 4122 SEQUENCE:4 STATUS:CONFIRMED SUMMARY:Matter & Electromagnetic Fields in Strong Gravity Workshop (8/24-8/ 28) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20100910T190000Z DTEND:20100910T200000Z DTSTAMP:20260828T094430Z UID:jbau30s71psr73gir77iskn7mc@google.com CREATED:20100826T203439Z DESCRIPTION:[Title] String Moduli Phenomenology and Cosmological History \n [Speaker] Prof. Gordon Kane\n[Institution] University of Michigan\n[Abstrac t] In this talk I first argue that compactified string theories with broken supersymmetry and with stabilized moduli generically have one or more modu li with masses of order the gravitino mass or less. Then cosmological cons traints imply the gravitino and moduli masses are of order 30 TeV or heavie r\, which implies the universe has a non-thermal cosmological history. Thi s in turn suggests that the LSP is wino-like\, predicting in particular a s ignal for galactic positrons and antiprotons consistent with that seen by t he PAMELA satellite\, and interesting LHC signals. LAST-MODIFIED:20230127T204933Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar Joint with Gravity Theory Semina r TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131105T181500Z DTEND:20131105T193000Z DTSTAMP:20260828T094430Z UID:1fs01jstk2slpbml0fa65977v0@google.com CREATED:20131028T143632Z DESCRIPTION:Title : Putting Water on a Lattice: The Importance of Long Wave length Density Fluctuations in Theories of Hydrophobic and Interfacial Phen omena.\n\nSpeaker Name: Dr. Suriyanarayanan Vaikuntanathan\n\nSpeaker Insti tution : UC Berkeley\n LAST-MODIFIED:20230127T204227Z LOCATION:IPST Building\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IPST Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091118T160000Z DTEND:20091118T170000Z DTSTAMP:20260828T094430Z UID:38id3ie6toisobinsu1ff2dm6g@google.com CREATED:20091027T170442Z DESCRIPTION:Speaker: Dr. Steve Koonin\, Undersecretary for Science\, DOE\n\ nAs DOE Undersecretary for Science\, Koonin serves as the secretary’s advis or on science policy as well as on the scientific aspects of all DOE activi ties\, from basic research to nuclear energy to the environmental clean-up of Cold War legacy sites to defense programs. He is responsible for plannin g\, coordinating and overseeing the Energy Department’s research and develo pment programs\, including the Office of Science\, and its 17 national labo ratories\, as well as the department’s scientific and engineering education al activities. The DOE is the third largest federal sponsor of basic resear ch in the United States\, the primary supporter of physical sciences in the nation\, and of researchers at more than 300 colleges and universities nat ionwide.\n\nPlease RSVP TO vpr@umd.edu by November 13\, 2009. Space is Limi ted. If you have questions\, please contact Anne Geronimo at geronimo@umd. edu orX54178 LAST-MODIFIED:20230127T204429Z LOCATION:Benjamin Banneker Room Adele H. Stamp Student Union SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Research Seminar Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120220T173000Z DTEND:20120220T183000Z DTSTAMP:20260828T094430Z UID:9htr369qoeqjfbgbj4lg27nfm4@google.com CREATED:20120215T162548Z DESCRIPTION:Title: Dissipation: a new tool in quantum information science\n Speaker: Ignacio Cirac\, Max-Planck-Institut für Quantenoptik\nAbstract: Qu antum Entanglement\, the most striking feature of Quantum Mechanics\, is al so the basic ingredient in most applications in the field of Quantum Inform ation. Unfortunately\, it is very fragile: in all experiments so far the co upling of the systems to the environment has leads to dissipation which eit her destroys entanglement or prevents its generation. Here we propose\, ana lyze\, and demonstrate a new method to entangle two distant macroscopic ato mic ensembles by purely dissipative means. This counterintuitive effect is achieved by engineering the coupling of our systems to the environment\, an d leads to a more robust and therefore longer lived entanglement. Apart fro m that\, we show that engineered dissipation can be used in quantum computa tion and communication\, as well as to create passive quantum memories and repeaters.\n LAST-MODIFIED:20230127T204908Z LOCATION:Physics 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111024T143000Z DTEND:20111024T153000Z DTSTAMP:20260828T094430Z UID:oipahmovhu6ren0u1fg93umosc@google.com CREATED:20111019T131259Z DESCRIPTION:Title : How to find non-Abelian anyons?\nSpeaker Name: Chenjie Wang\nSpeaker Institution : Brown University\nNotes: For all talks see: htt p://www.physics.umd.edu/cmtc/seminars.html\nAbstract : One of the most inte resting features of the Quantum Hall effect (QHE) is the presence of quasip articles whose charge is a fraction of electron charge and whose statistics is neither Bose nor Fermi. These quasiparticles are called anyons. The wav e function of anyons accumulates a non-trivial phase when one anyon moves a round others. In some QHE states\, for example QHE state at filling factor 5/2\, non-Abelian anyons are suspected to exist. Moving a non-Abelian anyon around others changes not only the phase but also the quantum state. This property makes a system of non-Abelian anyons a promising place for topolog ical quantum computing. However\, the existence of non-Abelian anyons in na ture remains an open question. In this talk\, I will present my graduate re search on proposals to detect the 5/2 QHE liquid\, including proposals to d etect non-Abelian statistics\, chirality of the QHE edge\, etc. LAST-MODIFIED:20230127T204408Z LOCATION:PHYS 2205 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20091001T161500Z DTEND:20091001T171500Z DTSTAMP:20260828T094430Z UID:ng8m6nu7mvsj8mosk6dbs5es60@google.com CREATED:20090928T182429Z DESCRIPTION:Neuronal Networks: Critical States and Functions\nHongdan Yang \nUniversity of Maryland and the National Institutes of Health LAST-MODIFIED:20230127T204658Z LOCATION:Room 1207\, Energy Research Facility SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Applied Dynamics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100915T191500Z DTEND:20100915T201500Z DTSTAMP:20260828T094430Z UID:qbpu2365p19mfks9vodg0ampo0@google.com CREATED:20100913T205159Z DESCRIPTION:[Title] "Why is the generalized second law of horizon thermodyn amics true?"\n[Speaker] Aron Wall\n[Institution] University of Maryland\n[A bstract] Normally the entropy of an open system can decrease if entropy flo ws out of it. The region outside of a black hole seems to be an exception—i ts entropy never decreases\, so long as one assigns to the horizon an area proportional to its event horizon. For a long time\, this astonishing resul t has only been shown for quantum fields that are in an approximately stead y state. I will describe a new proof of the generalized second law for semi classical\, rapidly-changing horizons. The reason it works is that the hori zon is invariant under a larger symmetry group than the rest of the spaceti me. LAST-MODIFIED:20230127T205126Z LOCATION:4102 Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Gravity Theory Sminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20101115T213000Z DTEND:20101115T223000Z DTSTAMP:20260828T094430Z UID:h761j2jj42nn16fala2v0sphq4@google.com CREATED:20101112T174122Z DESCRIPTION:Title: Is the Magnetic Field in the Outer Heliosphere Laminar?\ nSpeaker Name: James Drake\nSpeaker Institution : University of Maryland\nA bstract : The recent observations of the anomalous cosmic ray (ACR) energy spectrum as Voyagers 1 and 2 crossed the heliospheric termination shock hav e called into question the conventional shock source of these energetic par ticles. We have suggested that the sectored heliospheric magnetic field\, w hich results from the flapping of the heliospheric current sheet\, reconnec ts in the heliosheath.Particle-in-cell simulations reveal that most of the magnetic energy goes into the interstellar pickup ions with significant but smaller amounts of energy going into electrons and heated solar wind ions. The predicted spectra of ACRs based on this model is consistent with the V oyager observations. An important question is how to determine from the Voy ager data whether the sectored magnetic field has reconnected. The question is not as simple as you might expect because the post-reconnection state o f the sectored field region consistes of nested magnetic islands with a per iodicity that is similar but more irregular than the unreconnected sectored field. The reconnection dynamics of the sectored field and associated part icle acceleration will be discussed with an emphasis on the unusual propert ies of the post-reconnection nested magnetic islands and associated flows.\ n LAST-MODIFIED:20230127T205153Z LOCATION:CSS 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20131106T133000 DTEND;TZID=America/New_York:20131106T150000 DTSTAMP:20260828T094430Z UID:b7tcqveslskfsb1farnecbv490@google.com RECURRENCE-ID;TZID=America/New_York:20131106T133000 CREATED:20130816T163032Z DESCRIPTION:Title: Cosmic censorship and self-force\n\nSpeaker: Eric Poisso n\, University of Guelph\n\nAbstract: In the first part of the talk I will review the scenarios proposed by\nHubeny and Jacobson-Sotiriou that suggest that a near-extremal black\nhole can be turned into a naked singularity by absorbing a\nparticle. In the Hubeny case\, the black hole is charged\, an d it\nabsorbs a particle with sufficient charge to produce an overcharged\n final state. In the Jacobson-Sotiriou case\, the black hole is\nspinning\, and it absorbs a particle with sufficient angular momentum\nto produce an o verspinning state. I will explain why such scenarios\nviolate the third law of black-hole mechanics (although there may be a\nloophole)\, and seek a m echanism that prevents such overcharged or\noverspinning final states. I wi ll argue that self-force effects on the\nparticle could provide this mechan ism\, and describe earlier partial\nattempts to incorporate the self-force into the scenarios. In the\nsecond part of the talk I will describe ongoing work with Peter\nZimmerman on the formulation of the self-force when the b ackground\nmetric is not a solution to the vacuum field equations (which is the\ncase when the background spacetime describes a charged black hole). LAST-MODIFIED:20230127T204900Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120222T180000Z DTEND:20120222T190000Z DTSTAMP:20260828T094430Z UID:q7bqurcti674j77crorev5iosg@google.com CREATED:20120214T142436Z DESCRIPTION:Speaker: Victor Yakovenko\, Department of Physics\, University of Maryland\, College Park\nTopic: Statistical Mechanics of Money\, Income\ , Debt\, and Energy Consumption\nAbstract: By analogy with the probability distribution of energy in statistical physics\, I argue that the probabilit y distribution of money in a closed economic system should follow the expon ential Boltzmann-Gibbs law. Analysis of the empirical data shows that incom e distribution in the USA has a well-defined two-class structure. The major ity of the population (about 97%) belongs to the lower class characterized by the exponential ("thermal") distribution. The upper class (about 3% of t he population) is characterized by the Pareto power-law ("superthermal") di stribution\, and its share of the total income expands and contracts dramat ically during bubbles and busts in financial markets. The probability distr ibution of energy consumption per capita around the world also follows the exponential Boltzmann-Gibbs law.\nMore info: http://www.aps.org/units/maspg /meetings/meeting.cfm?name=SENIOR0212 LAST-MODIFIED:20230127T204321Z LOCATION:1st floor conference room at the American Center for Physics\, 1 P hysics Ellipse\, College Park\, MD SEQUENCE:0 STATUS:CONFIRMED SUMMARY:APS Mid-Atlantic Senior Physicists Groupb Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100223T193000Z DTEND:20100223T203000Z DTSTAMP:20260828T094430Z UID:84smtaj28hsctg5hdoetk2mp7k@google.com CREATED:20100217T195801Z DESCRIPTION:[Speaker] Yasunori Nomura\n[Institution] University of Californ ia\, Berkeley\n[Title] Precision Higgs Mass Prediction from the Multiverse\ n[Abstract] If the origin of the weak scale is environmental selection in t he multiverse\, the minimal theory below the unified scale is the standard model plus general relativity. We argue that this setup\, arising from str ing theory\, will likely lead to the Higgs mass in the range 128-141 GeV. Moreover\, in many theories the Higgs mass lies in the upper edge\, (141 \\ pm 2) GeV\, with the uncertainty dominated by the experimental errors on th e top quark mass and the QCD coupling. \nUncertainties from high energy phy sics are extremely small\, and at the level of \\pm 0.4 GeV. Verification of this prediction would provide strong evidence for supersymmetry\, broken near the unified scale\, and also for a Higgs boson that is elementary up to this high scale\, implying the environmental origin of the weak scale. We also discuss several variations of the minimal setup\, where WIMP dark m atter arises from environmental requirement.\n LAST-MODIFIED:20230127T205154Z LOCATION:4102 Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20130125T130000 DTEND;TZID=America/New_York:20130125T140000 DTSTAMP:20260828T094430Z UID:63vbbgdpk77qe40rjng87laic4@google.com RECURRENCE-ID;TZID=America/New_York:20130125T130000 CREATED:20130108T151219Z DESCRIPTION:Title : Porous Metal-Organic Frameworks for Methane Storage: Op portunities and Challenges\n\nSpeaker Name: Wei Zhou\n\nSpeaker Institution : Center for Neutron Research\, NIST\n\nAbstract : Methane\, the principal component of natural gas\, is an abundant fuel that is cheaper and cleaner burning than gasoline. Storing methane in a safe and convenient manner is critically important for facilitating the use of natural gas in automobiles . In recent years\, porous metal-organic frameworks (MOFs) have emerged as promising adsorbents for methane storage. [1\, 2] Thus far\, several MOF co mpounds (PCN-14\, Ni-MOF-74\, UTSA-20\, etc.) have been reported (by us and others) to exhibit high methane uptake at room temperature and modest pres sure\, surpassing the target for material-based\, adsorbed methane storage set by the U.S. Department of Energy. In this talk\, I am going to discuss our current mechanistic understanding of methane storage in these benchmark MOFs\, based on combined experimental and computational investigations. Ou r recent efforts to rationally search for MOFs with even higher methane sto rage capacities will also be presented\, and future directions will b\n e o utlined. MOFs’ potential for methane storage applications is enormous\, but there also exist several challenges\, one of which is their poor mechanica l stabilities. Many MOFs suffer pore collapse\, or even amorphization\, und er modest mechanical loadings. This makes industrial-scale processing of MO F powders rather difficult. To address this limitation\, we have conducted detailed studies on the mechanical stabilities of several prototypical MOFs . [3] In this talk\, I am going to discuss the origin of the low mechanical stabilities of MOFs\, and propose a viable route to improve them.\n\nRefer ences:\n\n[1] W. Zhou\, Chem. Rec.\, 10\, 200-204 (2010).\n\n[2] Y. He\, W. Zhou\, R. Krishna\, and B. Chen\, Chem. Comm.\, 48\, 11813–11831 (2012).\n \n[3] W. Zhou\, Chem. Comm.\, in press (2013). LAST-MODIFIED:20230127T204752Z LOCATION:Room 2108\, Chemical and Nuclear Engineering Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20131105T210000Z DTEND:20131105T220000Z DTSTAMP:20260828T094430Z UID:hephj32f54l1bbt3c9tmgcvfvs@google.com CREATED:20130821T153059Z DESCRIPTION:Speaker: Craig Hogan\, Fermilab Center for Particle Astrophysi cs and University of Chicago \nTitle: Experimental Quantum Geometry: Test ing the Stillness of Space\nAbstract: It is possible that new physics of qu antum geometry at the Planck scale has observable effects on macroscopic sc ales. There may be no such thing as a massive body at rest\; there may be a universal noise in position with Planck spectral density. Some theoretical motivations behind this idea will be reviewed\, and an experiment now unde rway at Fermilab to test it will be described. LAST-MODIFIED:20230127T204816Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20100907T171500Z DTEND:20100907T183000Z DTSTAMP:20260828T094430Z UID:7rea5eig06dpnpbomlcmg1io7s@google.com CREATED:20100831T155005Z DESCRIPTION:Title : Quantum Solutions for BECs (T&E) and Hard Core Boson Sy stems (Experiments in Modeling)\nSpeaker Name: Professor William Reinhardt\ nSpeaker Institution : University of Washington\, Seattle\nNotes: As in the past\, each seminar will be preceded by an INFORMAL CAFETERIA LUNCH to whi ch all are welcome\, departing from Room 1108 above five minutes after 12:0 0 (Noon).\n\nFor further information contact:\nProfessor Christopher Jarzyn ski\, cjarzyns@umd.edu (301)405-4439\nProfessor John Weeks\, jdw@umd.edu (3 01)405-4802\nProfessor Michelle Girvan\, Girvan@umd.edu (301)405-1610. LAST-MODIFIED:20230127T205309Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Institute for Physical Science & Technology Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101104T140000 DTEND;TZID=America/New_York:20101104T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20101104T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Quantum oscillations at quantum and classical phase tr ansitions"\n[Speaker] Stephen Julian\n[Institution] University of Toronto\n [Abstract] Quantum oscillations such as the de Haas-van Alphen effect have\ , over many decades\, made important contributions to our understanding of both conventional and exotic metals because they give information about the shape of the Fermi surface\, and the effective mass and lifetime of quasip articles at the Fermi surface. The observation of quantum oscillations is limited to low temperatures\, usually much lower than any other \ntransitio n would kill off the oscillations via critical scattering. However\, there are materials with antiferroquadrupolar (AFQ) phase transitions in which q uantum oscillations have been observed both above and below the AFQ transit ion. In this talk I will review the application of quantum oscillations in strongly correlated metals\, and then I will describe a careful examinatio n of quantum oscillations in PrOs4Sb12\, in which an AFQ phase forms a typi cal quantum-critical "dome" around a singlet-triplet crossing that occurs a round 9 T\, allowing us to follow the quantum oscillations across both quan tum and thermal phase boundaries. \n[Note] Refreshment is served at 1:30pm in room 1305F(new Toll Room) LAST-MODIFIED:20230127T203920Z LOCATION:Room 1201\, Physics Building SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20090427T203000Z DTEND:20090427T213000Z DTSTAMP:20260828T094430Z UID:s9rb21rvuubgvepbp0l1jenomk@google.com CREATED:20090422T181133Z DESCRIPTION:Title: Dispersive cascade and dissipation of solar wind turbule nce at electron scales:recent observations and theoretical modeling\nSpeake r: Fouad Sahraoui\, NASA/GSFC\, LPP/CNRS-Ecole Polytechnique LAST-MODIFIED:20230127T204119Z LOCATION:CSS Building\, Room 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20111202T160000Z DTEND:20111202T170000Z DTSTAMP:20260828T094430Z UID:k7oo4r6du0g96icj2hvnfqci68@google.com CREATED:20111130T144911Z DESCRIPTION:Title:"“Mixing and Segregation of Granular Materials in Rotatin g Tumblers”Professor Speaker: Richard Lueptow\, Associate \nDean for Resear ch\, McCormick School of Engineering\, Northwestern \nUniversity\n\n LAST-MODIFIED:20230127T204724Z LOCATION:DeWalt Seminar Room (Room 2164)\, Martin Hall (Bldg. 088) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Fluid Dynamics Reviews Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120315T180000Z DTEND:20120315T193000Z DTSTAMP:20260828T094430Z UID:k2i9r1qkfjhfjo0ccuto93a39k@google.com CREATED:20120118T181241Z DESCRIPTION:Speaker: Victor Gurarie\, University of Colorado @ Boulder\n\nT itle: From the topological invariants to the edge states of topological ins ulators.\n\nAbstract: We develop a method to characterize edge states of to pological insulators directly in terms of their topological invariants. The method is powerful and works regardless of the presence of disorder and in teractions. We apply this method to reproduce some known results\, such as the structure of the edge states in one\, two and three dimensions and thei r insensitivity to disorder. We then use it to discuss the effects of inter actions and in particular the possible fractionalized topological phases. I n one dimensions we use tDMRG to calculate the topological invariants and c haracterize the interacting topological phases. \n\nHost: Victor Galitski LAST-MODIFIED:20230127T204228Z LOCATION:Rm 1201\, Physics Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CNAM Condensed Matter colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120314T190000Z DTEND:20120314T200000Z DTSTAMP:20260828T094430Z UID:mluc3i4a3icmm5o0bq9m6aih20@google.com CREATED:20120118T144131Z DESCRIPTION:Speaker: Patricia A. Thiel\, Ames Laboratory and Department of Chemistry\, Iowa State University\, Ames\, Iowa\nLecture Title: “Quasicr ystals: Their Importance and Their Impact on Surface Science.”\nReception: Time/Location: 4:00 -5:00 PM\, G. Forrest Woods Atrium\, Chemistry Build ing\nHosts: Dept. of Chemistry & Biochemistry\, Dept. of Physics and ADVAN CE Program\n\nContacts for additional information: Janice Reutt-Robey\, rrobey@umd.edu and Ted Einstein\, einstein@umd.edu LAST-MODIFIED:20230127T204430Z LOCATION:Marker Seminar Room\, (Room 0112) Chemistry Building (091) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special ADVANCE Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20110307T170000Z DTEND:20110307T173000Z DTSTAMP:20260828T094430Z UID:s53u9hp8956ff4utf31bspldqk@google.com CLASS:PUBLIC CREATED:20110303T160847Z LAST-MODIFIED:20230127T204209Z LOCATION:Physics 1305 F "Toll Room" SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20090929T160000 DTEND;TZID=America/New_York:20090929T170000 DTSTAMP:20260828T094430Z UID:lj00jjn98tg9pv4i2ae1erjk9g@google.com RECURRENCE-ID;TZID=America/New_York:20090929T160000 CREATED:20090819T165808Z DESCRIPTION:Speaker: Joe Orenstein\, University of California Berkeley and Lawrence Berkeley\nLaboratory\n\nTitle: "Symmetry lost and found: emergenc e of a persistent spin\nhelix in a semiconductor".\n\nAbstract: Heat dissip ation is threatening to end the exponential increase in the\nrate of inform ation processing that has taken place over the last 25\nyears. As a result \, the search for modes of logic that use less\nenergy is intensifying. On e approach that has received considerable\nattention is to use the electron ’s spin degree of freedom\, rather than\nits charge. In this talk I will d iscuss the why spin might have\nadvantages\, why these advantages have not yet been realized\, and how\nthe present difficulties might be overcome. I will emphasize some\nrecent developments\, such as the ability to turn on and off SU(2) spin\nsymmetry with an applied electric field.\n LAST-MODIFIED:20230127T205243Z LOCATION:PHYS 1410 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20130909T160000Z DTEND:20130909T164500Z DTSTAMP:20260828T094430Z UID:l18t3huf9m0nkovmhjl1718j00@google.com CLASS:PUBLIC CREATED:20130909T134629Z DESCRIPTION:JQI Luncheon LAST-MODIFIED:20230127T204735Z LOCATION:CSS Room 2115 - JQI Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Luncheon TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20121107T193000Z DTEND:20121107T203000Z DTSTAMP:20260828T094430Z UID:ko6fus6opfqsejtq47buubt57k@google.com CREATED:20120905T170609Z DESCRIPTION:SPEAKER: Frank Lee - George Washington University\nTITLE: Had ron polarizabilities in lattice QCD\nABSTRACT: The internal structure of th e hadron in weak electromagnetic fields can be characterized by magnetic mo ment (mu)\, dipole electric and magnetic polarizabilities (alpha and beta)\ , and spin polarizabilities (gamma's). I will review progress on how to com pute them on the lattice. LAST-MODIFIED:20230127T204436Z LOCATION:Physics Rm 2202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20120208T191500Z DTEND:20120208T201500Z DTSTAMP:20260828T094430Z UID:h6gjl8jj5vjodtnvbdp3m1en7o@google.com CREATED:20120206T190216Z DESCRIPTION:SPEAKER: Gaute Hagen\, Oak Ridge Natl Lab\, TN\nTITLE: Toward s Model Independent Description of Nuclei with Coupled-Cluster Theory LAST-MODIFIED:20230127T205041Z LOCATION:Physics Rm 2202 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Nuclear Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20111031T200000Z DTEND:20111031T213000Z DTSTAMP:20260828T094430Z UID:utgvqlstpi4b8921ouqapc5uhg@google.com CREATED:20111021T182920Z LAST-MODIFIED:20230127T204207Z LOCATION:Room 1116\, IPST Building\, Bldg #85 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar: CANCELED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20081117T213000Z DTEND:20081117T223000Z DTSTAMP:20260828T094430Z UID:ihaerp992sv1fn68vhi9uhvvns@google.com CREATED:20080915T191504Z DESCRIPTION:Speaker:TBA\, TBA\nTitle:"TBA"\nWeb site:http://space.umd.edu:8 080/\nMore Information: Contact John Paquette\n(See paquette@umtof.umd.edu) \n LAST-MODIFIED:20230127T203932Z LOCATION:Computer and Space Sciences\, Room: 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20101111T140000 DTEND;TZID=America/New_York:20101111T153000 DTSTAMP:20260828T094430Z UID:68il5p8pf0sji15118j3796src@google.com RECURRENCE-ID;TZID=America/New_York:20101111T140000 CREATED:00010101T000000Z DESCRIPTION:[Title] "Loss of nodal quasiparticle integrity in underdoped YB a2Cu3O6+x"\n[Speaker] Andrea Damascelli\n[Institution] University of Britis h Columbia\n[Abstract] Arguably the most intriguing aspect of the physics o f layered cuprates is the close proximity between the record high-Tc superc onductivity (HTSC) and the antiferromagnetic charge-transfer insulating sta te driven by Mott-like electron correlations. These are responsible for the intimate connection between high and low-energy scale physics\, and their key role in the mechanism of HTSC was conjectured very early on. More recen tly\, the detection of quantum oscillations in high-magnetic field experime nts on YBa2Cu3O6+x (YBCO) has suggested the existence of a Fermi surface of well-defined quasiparticles in underdoped cuprates\, lending support to th e alternative proposal that HTSC might emerge from a Fermi liquid across th e whole cuprate phase diagram. Discriminating between these orthogonal scen arios hinges on the quantitative determination of the elusive quasiparticle weight Z\, over a wide range of hole-doping p. By means of angle-resolved photoemission spectroscopy on in-situ doped YBCO and following the evolutio n of bilayer band-splitting\, we show that the overdoped metal electronic s tructure (0.25