Two electron periodic Coulomb blockade and spin-orbit coupling in hybrid InAs-Al quantum dots

ORAL

Abstract

Proximity induced superconductivity in semiconductors with a strong spin-orbit interaction has recently been the subject of intense theoretical and experimental research, this is driven by the possibility of inducing topological superconductivity. We present measurements of one-dimensional hybrid superconductor-semiconductor quantum dots fabricated on an InAs two dimensional electron gas with an epitaxial Al layer.

We show that in the superconducting state the Coulomb blockade has a two electron periodicity, demonstrating the absence of quasiparticle poisoning. We observe the anti-crossing of spinful sub-gap states in magnetic field, whereby we obtain the spin-orbit direction and, by comparison to a theoretical model, an estimate of the spin-orbit coupling.

*Microsoft Corporation, the Danish National Research Foundation and the Villum Foundation.

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Presenters

  • Eoin O'Farrell

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

Authors

  • Eoin O'Farrell

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Asbjørn Drachmann

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Fabrizio Nichele

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Antonio Fornieri

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore di Pisa
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Alexander Whiticar

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Tiantian Wang

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

  • Geoffrey Gardner

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Station Q Purdue
    • Birck Nanotechnology Center, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Purdue University
    • Physics and Astronomy, Purdue University

  • Candice Thomas

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

  • Anthony Hatke

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • National High Magnetic Field Laboratory, Florida State University

  • Michael Manfra

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University
    • Purdue University
    • Physics, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University
    • Physics and Astronomy, Purdue University
    • Dept. of Physics and Astronomy, Purdue Univ

  • Charles Marcus

    • Center for Quantum Devices and Station Q, University of Copenhagen
    • Center for quantum devices, Niels Bohr Institute
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • University of Copenhagen