Impact of junction length on the supercurrent resilience against magnetic field in hybrid nanowire Josephson junctions

ORAL

Abstract

We study InSb/Al nanowire Josephson junctions of various lengths patterned by lithographically defined shadow-walls. All devices show comparable induced superconductivity and global back gate tunability at zero magnetic field. While the supercurrent in longer junctions (100nm-160nm) is suppressed above parallel fields of 0.6T-0.8T in the entire back gate range, in shorter junctions (30nm-40nm) we are able to detect switching current up to 1.2T parallel field with a supercurrent revival in some devices.. We also compare the switching current and the induced superconductivity in perpendicular magnetic fields (in-plane/out-of-plane) and find that in 30nm-40nm junctions these evolutions are qualitatively similar – both induced gap and switching current have higher out-of-plane than in-plane critical field - while in the junctions of 160nm switching current has opposite behaviour with in-plane critical field being higher. Our results confirm the importance of junction length in the supercurrent response to magnetic field and show that hybrid nanowire Josephson junctions can be engineered to reproducibly support supercurrent at parallel fields above 1T - allowing for observations of the supercurrent effects relevant for topological superconductivity in InSb/Al hybrid devices.

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Presenters

  • Vukan Levajac

    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

Authors

  • Vukan Levajac

    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Chun-Xiao Liu

    • Kavli Institute of Nanoscience, TUDelft
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Grzegorz Mazur

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Nick van Loo

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Elvedin Memisevic

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Daan Waardenburg

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Ghada Badawy

    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology

  • Sasa Gazibegovic

    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology

  • Erik P. A. M. Bakkers

    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology
    • TU Eindhoven

  • Sebastian Heedt

    • Microsoft station Q Delft
    • Microsoft Station Q Delft
    • Microsoft Quantum Lab Delft
    • Station Q Delft, Microsoft

  • Marina Quintero-Peréz

    • Microsoft Station Q Delft
    • Microsoft Quantum Lab Delft
    • Station Q Delft, Microsoft

  • Michael Wimmer

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology

  • Leo Kouwenhoven

    • Microsoft station Q Delft
    • Microsoft Station Q Delft
    • Quantum Lab Delft, Microsoft
    • Microsoft Quantum Lab Delft
    • Quantum lab Delft, Microsoft
    • Microsoft Corp
    • Station Q Delft, Microsoft

  • Jiyin Wang

    • Delft University of Technology
    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology