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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)

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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