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Senior Gregory Ridgway Named University Medalist

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Category: Department News
Published: Monday, May 22 2017 14:27

Gregory Ridgway. Photo by John T. Consoli.Gregory Ridgway. Photo by John T. Consoli.

From publishing in physics journals to performing at an international piano festival in Italy, Gregory Ridgway’s talents are as diverse as his experiences at UMD.

Graduating with a 3.98 GPA and three degrees—in physics, mathematics and piano performance—Ridgway’s ability to think both logically and creatively will be the foundation of his ambition to become a theoretical physicist.

“There are so many different ways to look at the world,” he says. “I could never just settle into one.” 

A recipient of Banneker/Key and National Merit scholarships, the native of Silver Spring, Md., has applied himself on and off campus in the arts. An organist, Ridgway works as director of music at Ager Road United Methodist Church in Hyattsville, and performed at the Amalfi Coast Music and Arts Festival and the International Keyboard Institute and Festival. He played with the Baltimore Symphony Orchestra and participated in UMD’s Music and Film series, which sets new scores to old silent films.

“I’ve been treated very well by Maryland,” Ridgway says. “If I had the desire, they had the resources.”

He began taking graduate classes as a junior, and helped author four articles published in Physical Review D and the Journal of High Energy Physics. Ridgway worked mostly in lattice physics, which explores concepts such as subatomic forces, neutron stars and the dynamics of the early universe.

“The daily interaction with someone of Greg’s breadth of culture is a joy in itself,” says UMD physics professor Paulo Bedaque. “One should ‘discover something, learn something and teach something every single day.’ I know no student who embodies this spirit better than Greg.”

The National Science Foundation awarded a graduate research fellowship to Ridgway, who will pursue a doctorate in physics at the Massachusetts Institute of Technology. He hopes to one day make an important contribution to science and has found great joy working alongside brilliant people who are painstakingly doing the incremental progress necessary to understanding our world.

“I love the work,” he says. “Each small problem we solve deserves a celebration.”

Writer: Liam Farrell

University of Maryland
College of Computer, Mathematical, and Natural Sciences
2300 Symons Hall
College Park, MD 20742
www.cmns.umd.edu
@UMDscience

Original story.

Labs IRL: Boxing up atomic ions

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Category: Research News
Published: Saturday, May 13 2017 11:15

What makes a university physics lab tick? Sean Kelley grabs a mic and heads to a lab that's trying to build an early quantum computer out of atomic ions. Marko Cetina and Kai Hudek, two research scientists at the University of Maryland who run the lab, explain what it takes to keep things from burning down and muse about the future of quantum computers.

Read more.

Tiny tug unleashes cryogenic currents

Details
Category: Research News
Published: Tuesday, May 09 2017 11:56

A crystal of samarium hexaboride sits suspended between two titanium supports. (Credit: A. Stern/UCI)

Researchers have found that a small stretch is enough to unleash the exotic electrical properties of a newly discovered topological insulator, unshackling a behavior previously locked away at cryogenic temperatures.

The compound, called samarium hexaboride, has been studied for decades. But recently it has enjoyed a surge of renewed interest as scientists first predicted and then discovered that it was a new type of topological insulator—a material that banishes electrical currents from its interior and forces them to travel along its periphery. That behavior only emerges at around 4 degrees above absolute zero, though, thwarting potential applications.

Now, experimentalists at the University of California, Irvine (UCI), working with JQI Fellow Victor Galitski and former JQI postdoctoral researcher Maxim Dzero (now at Kent State University), have found a way to activate samarium hexaboride's cryogenic behavior at much higher temperatures. By stretching small crystals of the metal by less than a percent, the team was able to spot the signature surface currents of a topological insulator at 240 K (minus 33 C)—nearly room temperature and, in any case, a far cry from 4 K. The currents even persisted once the strain was removed.

Their technique, which was recently reported in Nature Materials, uses piezoelectric elements that bend when they are fed with an electric current. By suspending a sample of samarium hexaboride between two titanium supports and pulling on one side, researchers could measure the crystal's electrical properties for different temperatures and amounts of stretch.

Last year, Galitski partnered with the same experimental group at UCI and discovered a potential application for samarium hexaboride's unusual surface currents. They found that holding a small crystal at a fixed voltage could produce oscillating currents on its surface. Such tick-tock signals are at the heart of modern digital electronics, but they typically require clocks that are much larger than the micron-sized crystals.

The new result might make such applications more likely, and it could even be achieved without any piezo elements. It may be possible to grow samarium hexaboride as a thin film on top of another material that would naturally cause it to stretch, the researchers say.

REFERENCE PUBLICATION
"Surface-dominated conduction up to 240K in the Kondo insulator SmB6 under strain," A. Stern, M. Dzero, V.M. Galitski, Z. Fisk, J. Xia, Nature Materials, advance online publication, – (2017)

RESEARCH CONTACT
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RELATED JQI ARTICLES
Oscillating currents point to practical application for topological insulators
An Ideal Material
Topological Insulators

Physics Staff Awards

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Category: Department News
Published: Thursday, April 27 2017 12:54

The Lorraine DeSalvo Chair's Endowed Award for Outstanding Service recognizes employees who provide benefit beyond their regular duties, promote positive professional and personal exchanges among colleagues, and work effectively within the Department of Physics and/or with outside contacts. Nominees must have been employed within the Department of Physics for a minimum of one year.

The Sibylle Sampson Award was established by Sibylle Sampson, a long-time Physics employee and valued assistant to former Chair John S. Toll. It spotlights an employee whose one-time accomplishment otherwise might go unrecognized. The employee’s undertaking will have benefited the entire Department or a specific unit, and shown creativity, initiative or self-motivation.  Nominees must have been employed within the Department of Physics for a minimum of one year. Two nominators are needed for the Sibylle Sampson Award.

The Staff Excellence Award recognizes employees who excel in job performance, provide a friendly and supportive atmosphere, and display a personal commitment to the Department and to positive workplace morale. Up to three awards may be given.  Nominees must have been employed within the Department of Physics for a minimum of one year.

 
YearDeSalvo Chair's AwardSibylle Sampson AwardStaff Excellence Award 

2022

2021 

2020  

2019  

2018

2017 

2016  

2015 

2014 

2013

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2011  

2010

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2008  

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1989  

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1987  

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1985  

1984 

1983

1982  

Clay Daetwyler

Brian Straughn

Jesse Anderson


Mark Conners

Lorraine DeSalvo

Bonnie Seal-Filiatreau

Pauline Rirksopa

Tommy Baldwin

Mark Conners

no awards

Jane Zhang

Paulina Alejandro

Nicholas Hammer

Jesse Anderson

Clay Daetwyler


Tuck Owens, Dan Margulies

Robert Dahms

Tom Payerle

John Cataldi

Mary Ridgell

Joyce Robinson

Margaret Lukomska

Tom Payerle

Pauline Rirksopa

Lorraine DeSalvo

Maurice Pairel

Loretta Robinette

Cassie Jones, Jesse Anderson

Dawn Leavell

Linda O'Hara, Betty Alexander

Bernadine Kozlowski

Geoffrey Elbo

Pam Solomos, Nono Kusuma

Jan Andrews

Karl Harzer, Brenda Dunn

Rose Otto

Pota Floros, Harriet Husman

Jean Clement

Michele Eastman

Elbert Barretta

Delores Knight

Rob McIntire

Naomi Russo

Dannielle Watkins

Samantha Suplee

Ayla Hurley

Paulina Alejandro

Logan Anbinder

Donna Hammer

Allen Monroe

no awards

Anne Suplee

Xiao Ning Zhao

Pauline Rirksopa

Bonnie Seal-Filiatreau

Doug Bensen, Scott Lasley

Loretta Robinette


Aaron McQueen

Kari Aldridge

Randy Holder

Donna Hammer

Sherri Menoes

Margaret Lukomska

Allen Monroe

Al Godinez

Tuck Owens

Ruth Zerwitz

Delores Knight

Norman Reese


Betty Alexander

Pauline Rirksopa


Pat Byrdsong

Josiland Chambers, Naomi Russo,  Bonnie Seal-Filiatreau

Lea Bartolome, Melanie Knouse, Allen Monroe

Melissa Britton, Josiland Chambers, Tom Woycheck-Gleason, Ayla Hurley, Bonnie Seal-Filiatreau

Janet Das Sarma, Donna Hammer, Kristin Stenson

Heather Markle, Don Lynch, Jane Wang

Jessica Crosby, Claudia Key and Kelly Phillips

Margaret Lukomska, Naomi Russo and Melissa Britton

Eliot Hammer

Amy Streets

no awards

Julie Callis

More Articles ...

  1. Christopher Monroe Enters National Academy of Sciences
  2. Trapped ions and superconductors face off in quantum benchmark
  3. Three UMD Students Named 2017 Goldwater Scholars
  4. The latest on HAWC and the search for high-energy gamma rays

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Phone: 301.405.3401

 

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