Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Y57: Superconductivity: Josephson & Tunneling-II
8:00 AM–10:36 AM,
Friday, March 18, 2022
Room: Hyatt Regency Hotel -Clark
Sponsoring
Unit:
DCMP
Chair: Richard Klemm, University of Central Florida
Abstract: Y57.00010 : AC Josephson effect in higher-order topological insulator WTe2*
9:48 AM–10:00 AM
Presenter:
Artem Kononov
(University of Basel)
Authors:
Artem Kononov
(University of Basel)
Martin Endres
(University of Basel)
Roy Haller
(University of Basel)
Fabian Oppliger
(Ecole Polytechnique Fédérale de Lausanne (EPFL))
Hasitha Suriya Arachchige
(University of Tennessee)
Jiaqiang Yan
(University of Tennessee)
David G Mandrus
(University of Tennessee)
Christian Schonenberger
(University of Basel)
Here, we study the AC Josephson effect in the few-layer thick WTe2. Our measurements indicate a strong contribution of the multi Cooper pair tunnelling events to the supercurrent. This observation suggests non-sinusoidal current-phase relation of the studied Josephson junctions due to the presence of superconducting modes with high transparency. We connect these modes with the hinge states in WTe2.
*We acknowledge support by the Georg H. Endress foundation, the European Research Council project Top-Supra (787414), the Swiss National Science Foundation (SNSF) project 200020B_192027 and project NCCR-QSIT and the Swiss Nanoscience Institute (SNI).
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