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説明:

The tunability of superconducting magic-angle twisted-layer graphene films elevates this material system to a promising candidate for superconducting electronics. We implement a gate-tuned Josephson junction within a magic- angle twisted four-layer graphene film. Field-dependent measurements of the critical current show a Fraunhofer-like pattern that differs markedly from the standard pattern with characteristics typical for a weak transverse screener. We observe sudden shifts that we associate with vortices jumping into and out of the leads and present a quantitative analysis of this phenomenon. By tuning the leads to the edge of the superconducting dome, we observe fast switching between superconducting and normal states, an effect that we associate with thermally activated vortex dynamics. Time-dependent measurements of these switching phenomena provide us with the vortex energy scale of order Kelvin and an estimate for the London penetration depth of a few micrometers, in agreement with recent kinetic inductance measurements on twisted graphene films. Our results prove the utility of our junction as a sensor for vortex detection, allowing us to extract fundamental properties of the 2D superconductor.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: magic-angle graphene (MATLG)
, superconducting vortices
, Josephson junction

刊行年月日: 2025-11-21

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 16 issue. 1 10259

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-025-65123-1

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更新時刻: 2026-02-17 12:30:34 +0900

MDRでの公開時刻: 2026-02-17 09:11:03 +0900