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Quantum transport in in-plane hybrid InSb-Al nanowire networks

ORAL

Abstract

Strong spin-orbit semiconductor nanowires with induced superconductivity are predicted to host Majorana zero modes (MZMs). Exchange (braiding) operations of MZMs form the logical gates on topological qubits and require a network of nanowires. Here, we demonstrate essential quantum transport properties on our novel in-plane selective-area growth InSb-Al platform which allows complex semiconductor-superconductor nanowire networks. The quantum transport phenomena include phase-coherent transport up to 5 harmonics of Aharonov-Bohm oscillations with a phase coherence length of ~10 μm. Tunneling spectroscopy on in-plane hybrid InSb/Al nanowires demonstrates a hard superconducting gap, accompanied by distinct oscillations of Andreev bound states while increasing the magnetic field. A Cooper pair island integrated in the nanowire network shows 2e-periodic Coulomb oscillations. The results confirm the high quality of the InSb nanowire networks, holding great promise for this platform for scalable topological networks.

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Presenters

  • Di Xu

    Delft University of Technology

Authors

  • Di Xu

    Delft University of Technology

  • Roy Op het Veld

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

  • Vanessa Schaller

    Delft University of Technology

  • Jason Jung

    Eindhoven University of Technology

  • Qingzhen Wang

    Delft University of Technology

  • Michiel De Moor

    Delft University of Technology

  • Bart Hesselmann

    Delft University of Technology

  • Kiefer Vermeulen

    Delft University of Technology

  • Jouri Bommer

    Delft University of Technology

  • Joon Sue Lee

    University of California Santa Barbara, University of Tennessee, Knoxville

  • Mihir Pendharkar

    Electrical and Computer Engineering, University of California Santa Barbara, University of California Santa Barbara, University of California, Santa Barbara

  • Chris J Palmstrom

    California NanoSystems Institute, University of California Santa Barbara, University of California, Santa Barbara, University of California Santa Barbara

  • Erik P. A. M. Bakkers

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

  • Leo Kouwenhoven

    Microsoft Quantum Lab Delft, Delft University of Technology, Delft University of Technology, Quantum Labs Delft, Microsoft, Microsoft Quantum Lab Delft, Quantum Lab Delft, Microsoft, Microsoft Corp

  • Hao Zhang

    Delft University of Technology