Topological Josephson Junctions in Corbino geometry

ORAL

Abstract

One-dimensional hybrid semiconductor/superconductor wires and, more recently, long Josephson junctions are the most versatile synthetic topological superconductors where non-abelian excitations can be realized and thoroughly investigated. In both realizations quasiparticle states appear at the physical boundaries, either at the ends of the nanowires or at the edges of the Josephson junction. Signatures of these states have been observed, studied and investigated by several groups with respect to various parameters such as magnetic field, chemical potential and the superconducting phase difference. In this work we report experimental investigation of Josephson junctions in the Corbino geometry fabricated from InAs/Al heterostructures. These devices are in a long junction regime with periodic boundary conditions. Transport studies of these junctions in a normal regime (zero in-plane magnetic field) and in the regime where some regions of the junction are in a topologically non-trivial regime (non-zero in-plane magnetic field) will be presented.

*The project was supported by DOE Basic Energy Sciences award DE-SC0008630.

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Presenters

  • Ananthesh Sundaresh

    • Department of Physics and Astronomy, PURDUE UNIVERSITY

Authors

  • Ananthesh Sundaresh

    • Department of Physics and Astronomy, PURDUE UNIVERSITY

  • Tyler Lindeman

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy, PURDUE UNIVERSITY

  • Geoff C Gardner

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

  • Sergei Gronin

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

  • Michael Manfra

    • Physics and Astronomy, Purdue Univ
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue
    • Purdue Univ
    • Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy, PURDUE UNIVERSITY
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Leonid Rokhinson

    • Department of Physics and Astronomy, PURDUE UNIVERSITY
    • Physics department and Birck Nanotechnology Center, Purdue university