Nonlocal conductance spectroscopy of Andreev bound states in 2DEG-based nanowires

ORAL

Abstract

We present experimental measurements of local and nonlocal tunneling spectroscopy of Andreev bound states in a hybrid superconductor-semiconductor three-terminal device based on a gate-defined InAs two-dimensional electron gas (2DEG) with an epitaxial Al layer. Andreev bound states in a nanowire with 0.6 μm between probes are investigated as a function of parallel magnetic field. At magnetic fields of order 2 T, we observe low-energy Andreev bound states, which oscillate around zero bias as a function of gate voltage, as expected, revealing in the non-local signal the oscillating electron-hole character of the bound state, consistent with theoretical predictions [1,2]. 

 

[1] J. Danon et al, Phys. Rev. Lett. 124, 036801 (2020)

[1] G.C. Ménard et al, Phys. Rev. Lett. 124, 036802 (2020)

*Research supported by Microsoft, the Danish National Research Foundation, and the Villum Foundation.

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Presenters

  • Andreas Pöschl

    • Univ of Copenhagen

Authors

  • Andreas Pöschl

    • Univ of Copenhagen

  • Alisa Danilenko

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Univ of Copenhagen

  • Deividas Sabonis

    • ETH Zurich
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Laboratory for Solid State Physics, ETH Zürich

  • Kaur Kristjuhan

    • Univ of Copenhagen

  • Tyler Lindemann

    • Department of Physics and Astronomy, Birck Nanotechnology Center, and Microsoft Quantum Lab Purdue, Purdue University
    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA
    • Purdue University

  • Sergei Gronin

    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Materials Lab-Purdue
    • Purdue University

  • Geoffrey C Gardner

    • Purdue University
    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA)
    • Microsoft Quantum Materials Lab-Purdue

  • Candice Thomas

    • 1. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907. 2.Birck Nanotechnology Center, Purdue University, West Lafayette IN, 47907
    • Purdue University

  • Michael J Manfra

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

  • Charles M Marcus

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen Denmark.
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Univ of Copenhagen