Probing the current phase relation of Josephson junctions in an InSbAs 2-dimensional electron gas

ORAL

Abstract

A superconducting quantum interference device (SQUID) is often used to probe the current-phase relationship (CPR) of a Josephson junction by controlling the phase difference across the junction of interest. In a material with strong spin-orbit coupling, tuning this phase difference to π is expected to result in topological superconductivity. We study SQUIDs in a hybrid Al/InSbAs 2-dimensional electron gas, a material with large spin-orbit coupling and g-factor. We simultaneously measure the CPR and perform tunneling spectroscopy at the edge of the junction to probe the Andreev bound states. We also study the evolution of the CPR and Andreev spectrum by changing the carrier density and in-plane magnetic field.

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Presenters

  • Chung-Ting Ke

    • Delft University of Technology

Authors

  • Chung-Ting Ke

    • Delft University of Technology

  • Christian Moehle

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

  • Candice Thomas

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • CEA, LETI, MINATEC Campus, 38054 Grenoble, France
    • Department of Physics and Astronomy, Purdue University

  • Di Xiao

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University

  • Mario Lodari

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

  • Vincent van de Kerkhof

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

  • Ruben Termaat

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

  • Saurabh Karwal

    • QuTech and Netherlands Organization for Applied Scientific Research (TNO)
    • Netherlands Organization for Applied Scientific Research

  • Charles Guinn

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University

  • Raymond Kallaher

    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Microsoft Quantum at station Q Purdue
    • Microsoft Station Q Purdue, Purdue University

  • Geoffrey C. Gardner

    • Purdue University
    • Purdue Univ
    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum at station Q Purdue
    • Microsoft Station Q Purdue, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Giordano Scappucci

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

  • Michael Manfra

    • Purdue University
    • Purdue Univ
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Department of Physics and Astronomy, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Srijit Goswami

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
    • Delft University of Technology