Single Andreev Bound State with Near-Perfect Transmission in an InAs Nanowire Josephson Junction

ORAL

Abstract

The spectra of Andreev bound states (ABS) in superconductor-semiconductor nanowire hybrid systems have been studied extensively to elucidate the physics of proximity effect in spatially-confined systems and their potential applications. When the semiconductor nanowire is contacted by two superconducting leads, it forms a Josephson junction that has a phase-dependent ABS spectrum. The energy-phase dispersion leads to a periodic Josephson current-phase relation (CPR), which reveals physical properties of the ABS. Using a scanning SQUID (Superconducting QUantum Interference Device) microscope, we inductively probe the CPR of individual Al-InAs-Al Josephson junctions as a function of local gates. Through statistical analysis of a short junction model, we find CPR at particular gate voltages to be consistent with a single near-perfectly transmitting ABS. We also discuss CPR analysis with multiple modes. We will continue to investigate the properties of these states and their potential relation to Majorana zero modes.

*We thank the Department of Energy, the National Science Foundation, Microsoft and the Danish National Research Foundation for their funding support.

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Presenters

  • Zheng Cui

    • Stanford Univ

Authors

  • Zheng Cui

    • Stanford Univ

  • Sean Hart

    • Stanford Univ

  • Eric Spanton

    • University of California - Santa Barbara
    • Stanford Univ
    • California Nanosystems Institute, University of California, Santa Barbara
    • California Nanosystems Institute, University of California
    • Univ of California - Santa Barbara

  • Mingtang Deng

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • University of Copenhagen

  • Gerbold Menard

    • Institut des Nanosciences de Paris (INSP), CNRS &Sorbonne University
    • University of Copenhagen

  • Peter Krogstrup

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices and Station-Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • University of Copenhagen

  • Charles Marcus

    • Center for Quantum Devices and Microsoft Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen
    • Univ of Copenhagen
    • University of Copenhagen

  • Kathryn Moler

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Physics and Applied Physics, Stanford University
    • Applied Physics, Stanford Univ
    • Stanford Univ