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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