Anisotropic supercurrent suppression and revivals in a graphene-based Josephson junction under in-plane magnetic fields

Philipp Schmidt; Katarina Stanojević; Kenji Watanabe; Takashi Taniguchi; Bernd Beschoten; Vincent Mourik; Christoph Stampfer

doi:10.1103/physrevb.111.245301

論文 Anisotropic supercurrent suppression and revivals in a graphene-based Josephson junction under in-plane magnetic fields

Philipp Schmidt ; Katarina Stanojević ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Bernd Beschoten ; Vincent Mourik ; Christoph Stampfer

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Philipp Schmidt, Katarina Stanojević, Kenji Watanabe, Takashi Taniguchi, Bernd Beschoten, Vincent Mourik, Christoph Stampfer. Anisotropic supercurrent suppression and revivals in a graphene-based Josephson junction under in-plane magnetic fields. Physical Review B. 2025, 111 (24), 245301. https://doi.org/10.1103/physrevb.111.245301

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(abstract)

We report on a tunable Josephson junction formed by a bilayer graphene ribbon encapsulated in WSe2 with superconducting niobium contacts. We characterize the junction by measurements of the magnetic field induced interference pattern, and the AC Josephson effect manifested as "Shapiro steps", examining current dependent hysteresis and junction dynamics. The latter can be tuned by temperature, gate voltage, and magnetic field. Finally, we examine the evolution of the supercurrent when subjected to in-plane magnetic fields. Notably, we observe a strong anisotropy in the super- current with respect to the orientation of the in-plane magnetic field. When the field is parallel to the current direction, the supercurrent is suppressed, and shows revivals with increasing magnetic field, whereas it remains almost unaffected when the field is oriented in a perpendicular direction. We suggest that this anisotropy is caused by the dependence of supercurrent interference on the junction geometry.

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