High Magnetic Field Stability in a Planar Graphene-NbSe<sub>2</sub> SQUID

Ayelet Zalic; Takashi Taniguchi; Kenji Watanabe; Snir Gazit; Hadar Steinberg

doi:10.1021/acs.nanolett.3c01552

論文 High Magnetic Field Stability in a Planar Graphene-NbSe₂ SQUID

Ayelet Zalic ; Takashi Taniguchi (National Institute for Materials Science) ; Kenji Watanabe (National Institute for Materials Science) ; Snir Gazit ; Hadar Steinberg

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引用

Ayelet Zalic, Takashi Taniguchi, Kenji Watanabe, Snir Gazit, Hadar Steinberg. High Magnetic Field Stability in a Planar Graphene-NbSe₂ SQUID. Nano Letters. 2023, 23 (13), 6102-6108. https://doi.org/10.1021/acs.nanolett.3c01552

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(abstract)

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.

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