Crossed Andreev reflection in an InSb 2DEG in the quantum Hall state

ORAL

Abstract

We embark on a novel approach to engineer a superconducting topological state of matter utilizing integer quantum hall (QH) edge states, coupled via crossed Andreev reflection (CAR) through a thin superconducting strip. This proposal has advantages in terms of control and manipulation of Majorona modes - building blocks for protected quantum information manipulation. Challenges arise due to conflicting requirements of a large magnetic field (to enter the QH regime), induced superconductivity and large superconducting coherence length of the strip. As a promising platform to implement this proposal, we use an InSb two-dimensional electron gas, which has high mobility and large g-factor, allowing to access ν=1 regime at fields around 3T. In addition, it has a large spin-orbit interaction, which is required to couple spin-polarized electrons through a superconductor. We implement and test several types of surface and side contacts of a high critical field Nb-based superconductors. We then explore behavior of the system in QH regime, where signatures of CAR are expected.

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Presenters

  • Ivan Kulesh

    • Delft University of Technology

Authors

  • Ivan Kulesh

    • 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

  • Sara Metti

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

  • 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

  • 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