Electric Field Tunable Superconductor-semiconductor Coupling in Majorana Nanowires

ORAL

Abstract

Hybrid semiconductor nanowire-superconductor systems have attracted interest in recent years as possible platforms for hosting Majorana Zero Modes (MZM). Although this system has been extensively studied both theoretically and experimentally, it has recently become clear that the effective parameters of the system depend strongly on the electrostatic environment. We use InSb nanowires with epitaxially grown Al superconductor to study the effect of electrostatic gating on device parameters such as the superconducting gap and the effective g-factor. We find that the induced superconducting gap as well as the effective Zeeman g-factor changes as the device is tuned from strong coupling to weak coupling, which is corroborated by Schrödinger-Poisson simulations of the device geometry. We further investigate the effect this has on the phase diagram of Zero Bias Conductance Peaks (ZBCP), which are generally considered as a signature of MZM.

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Presenters

  • Michiel De Moor

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Michiel De Moor

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Di Xu

    Delft Univ of Tech, QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Jouri Bommer

    Delft Univ of Tech, QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Hao Zhang

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Arno Bargerbos

    TU Delft, QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Georg Winkler

    Department of Physics, ETH Zurich, Theoretical Physics and Station Q, ETH Zurich

  • Andrey Antipov

    Station Q, Microsoft Research, Microsoft Station Q

  • Guanzhong Wang

    Delft Univ of Tech, QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Nick van Loo

    Delft Univ of Tech, QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Roy Op het Veld

    Eindhoven Univ of Tech, Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • Sasa Gazibegovic

    Department of Applied Physics, Eindhoven University of Technology, Eindhoven Univ of Tech, Eindhoven University of Technology

  • Diana Car

    Eindhoven Univ of Tech, Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • John Logan

    University of California Santa Barbara, Materials Department, University of California, University of California-Santa Barbara, University of California - Santa Barbara

  • Chris Palmstrom

    University of California Santa Barbara, Materials Department, California NanoSystems Institute, Electrical and Computer Engineering, University of California, University of California-Santa Barbara, California Nanosystems Institute, Dept. of Electrical and Computer Engineering, and Dept. of Materials, Univ of California - Santa Barbara, University of California - Santa Barbara, Electronics & Computer Enginneering, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials, University of California Santa Barbara, Univ of California - Santa Barbara

  • Roman Lutchyn

    Microsoft Station Q, Station Q, Microsoft Research, Microsoft Station Q Santa Barbara, Station Q, Microsoft Corp, Microsoft Corp

  • Erik Bakkers

    Eindhoven Univ of Tech, Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • Leo Kouwenhoven

    Microsoft Station-Q Delft, Delft University of Technology, Delft Univ of Tech, Qutech and Kavli Institute of Nanoscience and Microsoft Station Q Delft, Delft University of Technology, QuTech, Kavli Institute of Nanoscience, Station Q at Delft University of Technology, Delft University of Technology, Microsoft Station-Q at Delft University of Technology, Delft Univ. of Technology, Microsoft Station Q, Station Q Delft, Microsoft, Microsoft Station Q