Induced superconducting gap vs. barrier thickness in hybrid Al/Al<sub>0.15</sub>In<sub>0.85</sub>As/InAs heterostructures

ORAL

Abstract

The two dimensional electron gas (2DEG) in InAs proximitized by aluminum (Al) is a promising platform for scaling topological qubits based on Majorana zero modes. The 2DEG lies in an InAs quantum well and is separated from the epitaxial Al layer by a barrier of Al0.15In0.85As with thickness d. Due to hybridization between the wave functions of 2DEG and superconductor, the strength of induced gap in the 2DEG will largely depend on the barrier thickness. We present a systematic study of the strength of the induced gap in hybrid Al/Al0.15In0.85As/InAs superconductor/semiconductor heterostructures as a function of barrier thickness. We estimate the induced gap by analyzing multiple Andreev reflections in SNS junctions and differential conductance measurement in S-QPC-N junctions in the tunneling regime. We compare our results with self-consistent calculations of induced gap for our particular geometry.

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Presenters

  • Saeed Fallahi

    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Dept. of Physics and Astronomy, Purdue

Authors

  • Saeed Fallahi

    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Dept. of Physics and Astronomy, Purdue

  • Ray Kallaher

    • Microsoft
    • Microsoft Quantum at Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA

  • Sergei Gronin

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

  • Candice Thomas

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

  • Tian Wang

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

  • Geoffrey C. Gardner

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

  • Georg W. Winkler

    • Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA
    • Microsoft Station Q, Microsoft Quantum
    • Station Q, Microsoft Corp
    • Microsoft

  • Jan Gukelberger

    • Quantum Architecture and Computation Group, Microsoft Research, Redmond, Washington 98052, USA
    • Microsoft

  • John Gamble

    • Quantum Architecture and Computation Group, Microsoft Research, Redmond, Washington 98052, USA
    • Quantum Architectures and Computation Group, Microsoft Research

  • Andrey Antipov

    • Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA
    • Station Q, Microsoft
    • Microsoft

  • Roman Lutchyn

    • Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA
    • Microsoft Station Q, Microsoft Quantum
    • Station Q, Microsoft Corp
    • Station Q, Microsoft
    • Microsoft

  • Antonio Fornieri

    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Alexander Whiticar

    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Asbjorn C. C. Drachmann

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Eoin C O'Farrell

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices, Niels Bohr Institute
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Fabrizio Nichele

    • IBM Zurich Research Center
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

  • Charles M Marcus

    • Microsoft
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute
    • Center for Quantum Devices, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Michael Manfra

    • Purdue University
    • Microsoft
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Microsoft Station Q Purdue
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University
    • Station Q Purdue and Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Dept. of Physics and Astronomy, Purdue
    • Purdue University, Station Q Purdue
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University