Reopening of the superconducting gap in a planar Josephson junction

ORAL

Abstract

The reopening of the superconducting gap is a long-sought after hallmark of topological superconductivity. Here we study a one-dimensional superconductor formed in a planar Josephson junction that can undergo a topological phase transition in the presence of an in-plane magnetic field. As the external magnetic field is increased, we observe the closing and reopening of the superconducting gap, followed immediately by the appearance of a zero-bias mode, suggesting the formation of a topological state. We test the topological origin of the gap reopening by studying its dependence on superconducting phase difference, chemical potential and magnetic field direction.

*This work was supported by the Danish National Research Foundation and Microsoft.

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Presenters

  • Abhishek Banerjee

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

Authors

  • Abhishek Banerjee

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Md. Ahnaf Rahman

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • He-Ran Wang

    • Department of Physics, Tsinghua University

  • Mingrui Li

    • Tsinghua University
    • Department of Physics, Tsinghua University

  • Anders Kringhøj

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Asbjørn C C Drachmann

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Alexander Whiticar

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Omri Lesser

    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Tyler Lindemann

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Department of Physics and Astronomy, Purdue University

  • Sergei Gronin

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

  • Yuval Oreg

    • Weizmann Institute of Science
    • Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Ady Stern

    • Weizmann Institute of Science
    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • 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

  • Charles M Marcus

    • Niels Bohr Institute, University of Copenhagen
    • Microsoft Corp
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen