Theory of microwave spectra of Andreev levels in nanowire Josephson junctions

ORAL

Abstract

We find the energy spectrum and the electromagnetic response of Andreev bound states in Josephson junctions made of semiconducting nanowires. We focus on the joint effect of Zeeman and spin-orbit coupling on the Andreev level spectra. Our model incorporates the penetration of the magnetic field in the proximitized wires, which substantially modifies the spectra. We pay special attention to the occurrence of fermion parity switches at increasing values of the field, and to the repulsion of the Andreev levels from the quasiparticle continuum. These theoretical considerations are applied to the analysis of recent experimental results on the microwave spectroscopy of InAs/Al Josephson junctions (D. J. van Woerkom et al., arXiv:1609.00333), complementing the talk of A. Geresdi on the same work.

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Authors

  • B. van Heck

    Yale University, Department of Physics, Yale University, Department of Applied Physics, Yale University, New Haven, USA

  • J.I. V{\"a}yrynen

    Yale University, Department of Physics, Yale University, Yale Univ, Department of Applied Physics, Yale University, New Haven, USA

  • Leonid Glazman

    Yale University, Department of Physics, Yale University, Yale Univ, Department of Applied Physics, Yale University, New Haven, USA, Department of Applied Physics, Yale University

  • David J. van Woerkom

    QuTech and Kavli Institute of Nanoscience Delft

  • Alex Proutski

    QuTech and Kavli Institute of Nanoscience Delft

  • Daniel Bouman

    QuTech and Kavli Institute of Nanoscience Delft

  • Peter Krogstrup

    Center of Quantum Devices, Niels Bohr Institute, Copenhagen

  • Jesper Nygard

    Center of Quantum Devices, Niels Bohr Institute, Copenhagen

  • Leo P. Kouwenhoven

    QuTech and Kavli Institute of Nanoscience Delft

  • A. Geresdi

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