Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W56: Twisted Heterostructures and Straintronics
3:00 PM–5:48 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Burnham
Sponsoring
Unit:
DCMP
Chair: Dmitri Tenne, Boise State University
Abstract: W56.00007 : Zero-field superconducting diode effect in twisted trilayer graphene with spin-orbital coupling
4:12 PM–4:24 PM
Presenter:
Jiangxiazi Lin
(Brown University)
Authors:
Jiangxiazi Lin
(Brown University)
Phum Siriviboon
(Brown University)
Harley Scammell
(the University of New South Wales, Australia)
Song Liu
(Columbia University, US)
Daniel A Rhodes
(Columbia Univ)
Kenji Watanabe
(National Institute for Materials Science, Japan)
Takashi Taniguchi
(National Institute for Materials Science, Japan)
James C Hone
(Columbia University)
Mathias S Scheurer
(University of Innsbruck, Austria)
J.I.A. Li
(Brown University)
The evidence for the diode effect comes from the observed nonreciprocity in the current-voltage characteristic of the superconducting phase at B=0. Notably, the sign of nonreciprocity can be trained using an applied magnetic field and reversed by simply varying field-effect doping.
Such experimental control on the zero-field nonreciprocity points towards spontaneously TRS breaking resulting from isospin ferromagnetic order which coexists with the superconducting phase. The observed nonreciprocal superconducting transport behavior also provides strong evidence for finite momentum superconductivity.
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