Superconducting proximity effect in InAsSb surface quantum wells with in-situ Al contacts

ORAL

Abstract

We demonstrate a robust superconducting proximity effect in InAs0.5Sb0.5 quantum wells grown with epitaxial Al contacts, which has important implications for mesoscopic and topological superconductivity. Unlike more commonly studied InAs and InSb semiconductors, bulk InAs0.5Sb0.5 supports stronger spin-orbit coupling and a larger g-factor. Through structural and transport characterization we observe high-quality interfaces and strong spin-orbit coupling. We fabricate Josephson junctions based on InAs0.5Sb0.5 quantum wells and observe a strong proximity effect. These junctions exhibit products of normal resistance and critical current, IcRN = 270μV, and excess current, IexRN = 200μV, at contact separations of 500nm. Both of these quantities demonstrate a robust and long-range proximity effect with highly-transparent contacts.

*This work was partially supported by NSF DMR 1836687, the US Army research office, US ONR N000141712793, NSF ECCS-1810266, the University at Buffalo Center for Computational Research, and the ARO/LPS Quantum Computing Graduate Research Fellowship (QuaCGR BAA W911NF-17-S-0002).

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Presenters

  • William Schiela

    • Department of Physics, New York University

Authors

  • William Schiela

    • Department of Physics, New York University

  • 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

  • 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

  • Mehdi Hatefipour

    • New York University
    • New York Univ NYU
    • Department of Physics, New York University

  • Wendy L Sarney

    • US Army Combat Capabilities Command, Army Research Laboratory

  • Stefan P Svensson

    • US Army Combat Capabilities Command, Army Research Laboratory

  • Asher Leff

    • US Army Combat Capabilities Command, Army Research Laboratory
    • Sensors and Electronic Devices, U.S. Army Research Laboratory, Adelphi, MD 20783

  • Tiago De Campos

    • Department of Physics, University at Buffalo

  • 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

  • Matthieu Dartiailh

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

  • Igor Zutic

    • Department of Physics, State Univ of NY - Buffalo
    • University at Buffalo
    • Physics, Buffalo State Univeristy of New York
    • Department of Physics, State University at New York at Buffalo
    • State Univ of NY - Buffalo
    • Physics, University at Buffalo, State University of New York
    • Department of Physics, University at Buffalo
    • Department of physics, University at Buffalo

  • 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