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Thin NbSe2 retains superconductivity at high in-plane magnetic field up to 30 T. In this work we construct a novel atomically thin, all van der Waals SQUID, in which current flows between NbSe2 contacts through two parallel graphene weak links. The 2D planar SQUID remains uniquely stable at high in-plane field, which enables tracing critical current interference patterns as a function of the field up to 4.5 T. From these we extract the evolution of the current distribution up to high fields, demonstrating sub nanometer sensitivity to deviation of current flow from a perfect atomic plane, and observing a field-driven transition in which supercurrent redistributes to a narrow channel. We further suggest a new application of the asymmetric SQUID geometry to directly probe the current density in the absence of phase information.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: NbSe2, superconductivity, van der Waals SQUID

Date published: 2023-07-12

Publisher: American Chemical Society (ACS)

Journal:

• Nano Letters (ISSN: 15306984) vol. 23 issue. 13 p. 6102-6108

Funding:

• United States-Israel Binational Science Foundation 2016320
• Israel Science Foundation 586/22
• Israel Science Foundation 861/19
• Israel Science Foundation 994/19
• Japan Society for the Promotion of Science 19H05790
• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 21H05233
• Azrieli Foundation

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

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.3c01552

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Updated at: 2025-02-14 16:31:26 +0900

Published on MDR: 2025-02-14 16:31:26 +0900