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    Evaluation of the vortex core size in gate-tunable Josephson junctions in Corbino geometry

    Sadashige Matsuo1,2,3,*, Mizuki Tateno1, Yosuke Sato1, Kento Ueda1, Yuusuke Takeshige1, Hiroshi Kamata1,3, Joon Sue Lee4, Borzoyeh Shojaei5, Christopher J. Palmstrøm4,5,6 et al.

    Seigo Tarucha1,3,†

    • 1Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
    • 2JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
    • 3Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
    • 4California NanoSystems Institute, University of California, Santa Barbara, California 93106, USA
    • 5Materials Department, University of California, Santa Barbara, California 93106, USA
    • 6Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA

    • *sadashige.matsuo@riken.jp
    • †tarucha@riken.jp
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    Phys. Rev. B 102, 045301 – Published 2 July, 2020

    DOI: https://doi.org/10.1103/PhysRevB.102.045301

    Abstract

    We report on electron transport in gate-tunable Corbino-geometry Josephson junctions (CJJs) fabricated from an epitaxially grown Aluminum (Al) superconductor on an InAs quantum well. We observed that a supercurrent can be tuned by the gate voltage and sweeping an out-of-plane magnetic field initiates a sudden rise in the electrical resistance. From the analysis using a theoretical model for flow resistance due to Josephson vortices in CJJs, we evaluate the vortex core size, which substantially depends on the carrier density and temperature. These results will be subsequently utilized for future operations of the Josephson vortices in CJJs.

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    Phys. Rev. B 102, 045301– Published 2 July, 2020
    • Received 16 October 2019
    • Revised 17 May 2020
    • Accepted 14 June 2020
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