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.

*European Research Council, Dutch Organization for Scientific Research, and Microsoft Corporation Station Q

–

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