JQI-QuICS-CMTC Seminar

Date
Fri, Feb 22, 2019 12:00 pm - 12:40 pm
Location
PSC 2136

Description

Title: Weak-link Josephson Junctions Made from Topological Crystalline Insulators

Speaker: Rodney Snyder, JQI

Abstract: We report on 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 junctions are characterized and compared to those fabricated with weak links of PbTe, a similar material yet topologically trivial. Most striking is the difference in the ac Josephson effect: junctions made with Pb_0.5 Sn_0.5Te exhibit a rich subharmonic structure consistent with a skewed current-phase relation. This structure is absent in junctions fabricated from PbTe. A discussion is given on the origin of this effect as an indication of novel behavior arising from the topologically nontrivial surface state.

DOI:https://doi.org/10.1103/PhysRevLett.121.097701

Notes: Lunch served at 12:00 pm, talk at 12:10 pm.