Gate-tunable proximity effect in epitaxial Al-InAs Josephson junctions using hBN gate dielectric

ORAL

Abstract

The transparent interface of epitaxial Al-InAs heterostructures provides an excellent platform for potential advances in topological superconductivity and superconducting quantum computation. Josephson junctions built on these heterostructures can be gated, allowing for tuning of the supercurrent. We report the fabrication and measurement of gate-tunable Al-InAs Josephson junctions in which the gate dielectric in contact with the InAs was mechanically exfoliated hexagonal boron nitride (hBN). We discuss fabrication processes that enable compatibility between layered material transfer and Al-InAs heterostructures. By comparing these devices with others using a conventional AlOx gate dielectric, we show that hBN is a suitable gate dielectric for the Al-InAs material platform. Specifically, the product of normal resistance and critical current, is comparable for both types of devices, but higher RN for the hBN-based devices suggests the possibility of less unintentional doping of the InAs by the gate dielectric.

*We acknowledge support from NSF DMR-1610126 and NSF DMR 1836687.

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Presenters

  • Joshua Thompson

    • Physics, University of Arkansas

Authors

  • Joshua Thompson

    • Physics, University of Arkansas

  • William Mayer

    • Department of Physics, New York University
    • New York University
    • Physics, New York University
    • New York Univ NYU
    • Center for Quantum Phenomena, New York University

  • Fatemeh Barati

    • Physics & Astronomy, UCR
    • Physics, New York University

  • Joseph Yuan

    • New York University
    • Physics, New York University
    • New York Univ NYU
    • Center for Quantum Phenomena, New York University
    • Department of Physics, New York University

  • Kaushini S Wickramasinghe

    • New York University
    • Physics, New York University
    • University of Maryland, College Park
    • Center for Quantum Phenomena, New York University
    • New York Univ NYU
    • Department of Physics, New York University

  • Kasra Sardashti

    • New York University
    • New York Univ NYU
    • Physics, New York University
    • Center for Quantum Phenomena, NYU

  • Takashi Taniguchi

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Kenji Watanabe

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institute for Material Science, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • NIRM
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science (NIMS)
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Javad Shabani

    • Department of Physics, New York University
    • New York University
    • Physics, New York University
    • New York Univ NYU
    • Center for Quantum Phenomena, New York University
    • Center for Quantum Phenomena, NYU

  • Hugh Churchill

    • Physics, University of Arkansas
    • Physics, Univ of Arkansas-Fayetteville
    • University of Arkansas