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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.

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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