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Nonlocal conductance in three-terminal hybrid Al/InSb nanowire devices

ORAL

Abstract

Majorana zero-energy modes (MZMs) emerge at the edges of a one-dimensional topological segment. Signatures of these modes are correlated zero-bias peaks (ZBPs) in the local conductance that emerge simultaneously at both edges. The energy gap that separates them from the continuum - the bulk topological gap - can be identified in the nonlocal conductance, which is insensitive to local Andreev levels or transmission resonances. Thus, it is a vital tool to distinguish nontopological zero-energy modes and MZMs. Here, we have realized hybrid three-terminal devices based on InSb nanowires. The proximity-induced superconductivity is achieved via selective shadow-wall deposition of Al thin films. We demonstrate a hard induced gap using voltage-bias spectroscopy and study the appearance of zero-bias peaks in the local conductance. Harnessing the three-terminal geometry, we investigate the evolution of the nonlocal conductance in a magnetic field before the transition to the normal state.

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Presenters

  • Sebastian Heedt

    Microsoft Quantum Lab Delft, Microsoft station Q Delft, Microsoft Corp Delft

Authors

  • Sebastian Heedt

    Microsoft Quantum Lab Delft, Microsoft station Q Delft, Microsoft Corp Delft

  • Francesco Borsoi

    QuTech, Delft University of Technology, Delft University of Technology, TU Delft

  • Marina Quintero Perez

    Microsoft Quantum Lab Delft, Microsoft station Q Delft

  • Alexandra Fursina

    Microsoft Quantum Lab Delft, Microsoft station Q Delft

  • Nick Loo

    QuTech, Delft University of Technology, Delft University of Technology

  • Ghada Badawy

    Dept. of Physics, Technical University, Eindhoven, The Netherlands, Eindhoven University of Technology, Department of Applied Physics, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, TU Eindhoven

  • Sasa Gazibegovic

    Dept. of Physics, Technical University, Eindhoven, The Netherlands, Eindhoven University of Technology, Department of Applied Physics, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, TU Eindhoven

  • Kevin Van Hoogdalem

    Microsoft Quantum Lab Delft, Microsoft station Q Delft

  • Erik Bakkers

    Dept. of Physics, Technical University, Eindhoven, The Netherlands, Eindhoven University of Technology, Department of Applied Physics, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, TU Eindhoven, Applied Physics, Eindhoven University of Technology

  • Leo P Kouwenhoven

    Dept. of Physics, Technical University, Delft, The Netherlands, Microsoft Quantum Lab Delft, Microsoft Quantum Lab Delft, Delft University of Technology, Microsoft Corp Delft, Quantum Lab Delft, Microsoft, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Microsoft Corp