Vortex-induced anomalies in the superconducting quantum interference patterns of topological insulator Josephson junctions

Rashidi, Arman; Huynh, William; Guo, Binghao; Ahadi, Sina; Stemmer, Susanne

doi:10.1038/s41535-024-00684-w

Vortex-induced anomalies in the superconducting quantum interference patterns of topological insulator Josephson junctions

Journal Article · Tue Sep 17 00:00:00 EDT 2024 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-024-00684-w· OSTI ID:2447018

; Huynh, William; ; Ahadi, Sina;

Abstract

The superconducting quantum interference (SQI) patterns of Josephson junctions fabricated from hybrid structures that interface an s-wave superconductor with a topological insulator can be used to detect signatures of novel quasiparticle states. Here, we compare calculated and experimental SQI patterns obtained from hybrid junctions fabricated on cadmium arsenide, a two-dimensional topological insulator. The calculations account for the effects of Abrikosov (anti-) vortices in the superconducting contacts. They describe the experimentally observed deviations of the SQI from an ideal Fraunhofer pattern, including anomalous phase shifts, node lifting, even/odd modulations of the lobes, irregular lobe spacing, and an asymmetry in the positive/negative magnetic field. We also show that under a current bias, these vortices enter the electrodes even if there is no intentionally applied external magnetic field. The results show that Abrikosov vortices in the electrodes of the junctions can explain many of the observed anomalies in the SQI patterns of topological insulator Josephson junctions.

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Research Organization:: University of California, Santa Barbara, CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation’s EPiQS Initiative; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2447018

Alternate ID(s):: OSTI ID: 2446887

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 9; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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