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.

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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