Observing pairs of zero-bias end states in three-terminal Superconductor-Semiconductor devices: Part I

ORAL

Abstract

Majorana zero-energy modes located at the ends of topological superconductors are an appealing platform for topological quantum computing. Zero-bias peaks (ZBPs) are ubiquitously observed in tunneling spectroscopy of hybrid superconductor-semiconductor nanowires, consistent with expectations for Majorana modes. However, the emergence of those zero-energy modes in pairs at the ends of 1D topological superconductors is a central -- and so far untested -- prediction. Enabled by recent materials breakthroughs in selective area growth (SAG), we demonstrate a platform for testing this prediction by probing the conductance matrix of a three-terminal InAs wire proximitized by Al. We introduce the measurement technique and study correlations of sub-gap states at zero field, finding evidence of localized states at the wire ends and delocalized bulk states. Correlated, zero-bias features emerging in finite field at both ends of the device will be presented in Part II.

*This work was supported by Microsoft Project Q, the Danish National Research Foundation and the Villum Foundation.

–

Presenters

  • Denise Puglia

    • University of Copenhagen

Authors

  • Denise Puglia

    • University of Copenhagen

  • Gian-Luca Anselmetti

    • University of Copenhagen

  • Gerbold Menard

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

  • Filip Malinowski

    • Delft University of Technology
    • University of Copenhagen
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Center for Quantum Devices, Niels Bohr Institute
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Esteban A Martinez

    • University of Copenhagen

  • Joon Sue Lee

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • California NanoSystems Institute, University of California, Santa Barbara
    • Department of Physics, The Pennsylvania State University
    • University of California, Santa Barbara

  • Sukgeun Choi

    • University of California - Santa Barbara
    • University of California Santa Barbara

  • Mihir Pendharkar

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Department of Electrical and Computer Engineering, University of California, Santa Barbara
    • Electrical and Computer Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • University of California, Santa Barbara

  • 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

  • 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

  • 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

  • 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

  • Chris Palmstrom

    • University of California, Santa Barbara
    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Electrical & Computer Engineering, University of California, Santa Barbara
    • ECE and Materials, University of California, Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara

  • 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

  • Lucas Casparis

    • Microsoft
    • Niels Bohr Institute, Univ of Copenhagen
    • Niels Bohr Institute
    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Microsoft Quantum Research, Copenhagen

  • Andrew P Higginbotham

    • JILA, University of Colorado Boulder
    • Microsoft