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Quantum transport in in-plane selective area InSb-Al nanowire quantum networks

ORAL

Abstract

Strong spin-orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of the Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we implement an in-plane selective-area growth technique for InSb-Al allowing complex semiconductor-superconductor nanowire networks with excellent quantum transport properties. Essential quantum transport phenomena for topological quantum computing are demonstrated in these structures including phase-coherent transport up to 5 harmonics of Aharonov-Bohm oscillations with a phase coherence length of ~10 μm. Tunneling spectroscopy on hybrid InSb-Al nanowires demonstrates a hard superconducting gap, accompanied by 2e-periodic Coulomb oscillations with an Al-based Cooper pair island integrated in the nanowire network. The results, together with possible Majorana signatures, 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

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Di Xu

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Roy Op het Veld

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

  • Vanessa Schaller

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Jason Jung

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

  • Qingzhen Wang

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Michiel De Moor

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Bart Hesselmann

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Kiefer Vermeulen

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Jouri Bommer

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Joon Sue Lee

    California Nano-Systems Institute, Univ. of California, Santa Barbara, CA, USA, University of Tennessee Knoxville, Univ of California, Santa Barbara, Physics & Astronomy, Seoul National University, University of California Santa Barbara, California Nanosystems Institute, University of California Santa Barbara, University of California, Santa Barbara

  • Mihir Pendharkar

    Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA, IEE, UC Santa Barbara, University of California Santa Barbara, Univ of California, Santa Barbara, Electrical and Computer Engineering, University of California Santa Barbara, Electrical & Computer Engineering, University of California, Santa Barbara, University of California, Santa Barbara

  • Chris J Palmstrom

    Materials Department, University of California, Santa Barbara, UCSB, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara, Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA, Univ. of California, Santa Barbara, Electrical and Computer Engineering Department, University of California, Santa Barbara, University of California, Santa Barbara, IEE, UC Santa Barbara, University of California Santa Barbara, Univ of California, Santa Barbara, Electrical and Computer Engineering, University of California Santa Barbara, Materials and Electrical & Comp. Eng, University of California, Santa Barbara

  • 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

  • Hao Zhang

    Tsinghua University, QuTech and Kavli Institute of Nanoscience, Delft University of Technology