Article Current–Phase Relation of a WTe2 Josephson Junction

Martin Endres ; Artem Kononov ; Hasitha Suriya Arachchige ; Jiaqiang Yan ; David Mandrus ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Christian Schönenberger

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Martin Endres, Artem Kononov, Hasitha Suriya Arachchige, Jiaqiang Yan, David Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schönenberger. Current–Phase Relation of a WTe2 Josephson Junction. Nano Letters. 2023, 23 (10), 4654-4659. https://doi.org/10.1021/acs.nanolett.3c01416
SAMURAI

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(abstract)

Topological insulators (TI) host gapless boundary states that are protected by time-reversal sym- metry against local perturbations. When incorporated into a Josephson junction, the system is predicted to form a chiral superconductor with zero-energy Andreev bound-states. Recently, it was shown that highly transparent superconducting contacts can be formed in the higher-order TI WTe2 by palladium diffusion into the material, forming PdTex. Here, we embed two such Josephson junc- tions into an asymmetric SQUID loop in order to measure the current-phase relation of the weak Josephson junction. The measured critical current is highly affected by inductance effects, despite the loop inductance being negligible. We assign the inductive contribution to the superconduct- ing PdTex. We model our data by maximizing the supercurrent in the SQUID loop and find the 1.5 μm long junction is best described in the short ballistic limit. Our data highlights the complexity of inductance effects that reach beyond the loop inductance and can even give rise to topological signatures in transport measurements.

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Keyword: Topological insulator, Josephson junction, current–phase relation

Date published: 2023-05-24

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 23 issue. 10 p. 4654-4659

Funding:

  • Oak Ridge National Laboratory
  • Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung
  • Gordon and Betty Moore Foundation GBMF9069
  • Basic Energy Sciences
  • Core Research for Evolutional Science and Technology JP-MJCR15F3
  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science 20H00354
  • Swiss Nanoscience Institute
  • Georg H. Endress Foundation
  • H2020 European Research Council 787414
  • National Centre of Competencies Research Quantum Science and Technology

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.3c01416

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Updated at: 2025-02-26 12:31:11 +0900

Published on MDR: 2025-02-26 12:31:11 +0900

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