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CATEGORIES:Lectures & Presentations
DESCRIPTION:Department of Physics Seminar Series\n\n \n\nJosephson effects 
 in Dirac semimetal Cd3As2\n\n \n\nDr. Wei Pan\n\n \n\nSuperconducting Josep
 hson junctions (JJs) made of topological quantum materials have attracted a
  great deal of current interests due to their non-trivial band topology and
  the capability of realizing topological superconductivity.\n\n \n\nIn this
  talk\, I will report our recent observations of novel Josephson effects in
  topological JJs and superconducting quantum interference devices (SQUIDs) 
 mediated by Cd3As2\, a topological Dirac semimetal. First\, in aluminum- Cd
 3As2-aluminum JJs\, a π periodic supercurrents are observed. Our data analy
 sis suggests that this π period could arise from interference between the i
 nduced bulk superconductivity and the induced Fermi-arc surface superconduc
 tivity. Moreover\, we observe that in Cd3As2 SQUIDs this phase coupling bet
 ween the surface-bulk superconducting channels is responsible for a surpris
 ing discovery of the Leggett modes\, a collective quantum phenomenon predic
 ted more than 50 years ago. Finally\, we show that this phase coupling can 
 further induce time-reversal symmetry breaking and\, therefore\, can give r
 ise to a zero-field Josephson diode effect in asymmetric Cd3As2 SQUIDs.\n\n
  \n\nDisclaimer: Sandia National Laboratories is a multimission laboratory 
 managed and operated by National Technology and Engineering Solutions of Sa
 ndia LLC\, a wholly owned subsidiary of Honeywell International Inc. for th
 e U.S. DOE's National Nuclear Security Administration under contract DE-NA0
 003525. This abstract describes objective technical results and analysis. A
 ny subjective views or opinions that might be expressed in the paper do not
  necessarily represent the views of the U.S. DOE or the United States Gover
 nment.
DTEND:20260304T193000Z
DTSTAMP:20260412T233551Z
DTSTART:20260304T183000Z
GEO:36.846385;-76.27197
LOCATION:Marie V. McDemmond Center for Applied Research\, 625
SEQUENCE:0
SUMMARY:Department of Physics Seminar Series: Part 6
UID:tag:localist.com\,2008:EventInstance_52207240938631
URL:https://events.nsu.edu/event/department-of-physics-seminar-series-part-
 6
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