Quantized Majorana conductance (I): hard gap and quantized zero bias peaks

ORAL

Abstract

Majorana zero-modes hold great promise for topological quantum computing. A semiconductor nanowire coupled to a superconductor can be tuned into a topological superconductor with two Majorana zero-modes localized at the wire ends. Tunneling spectroscopy in electrical transport is the primary tool to identify the presence of Majorana zero-modes, which manifests itself as a zero-bias peak (ZBP) in the differential-conductance. The Majorana ZBP-height is predicted to be quantized at the universal conductance value of 2e2/h at zero temperature. Previous experiments, however, have shown ZBPs much smaller than 2e2/h. The primary reason is due to dissipation from the soft gap. Here, we demonstrate that we have solved the soft gap problem [1], which leads to the observation of a quantized zero-bias peak at 2e2/h [2].

[1] Gazibegovic S, Car D, Zhang H, et al. Epitaxy of advanced nanowire quantum devices. Nature 548, 434-438 258 (2017).
[2] Zhang H, Liu CX, Gazibegovic S, et al. Quantized Majorana conductance. arXiv:1710.10701.

*This work has been supported by the European Research Council (ERC), the Dutch Organization for Scientific Research (NWO), Office of Naval Research (ONR), Laboratory for Physical Sciences (LPS) and Microsoft Corporation Station-Q.

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Presenters

  • Di Xu

    • Delft Univ of Tech

Authors

  • Di Xu

    • Delft Univ of Tech

  • Hao Zhang

    • Delft Univ of Tech

  • Chun-Xiao Liu

    • Univ of Maryland-College Park
    • University of Maryland

  • Guanzhong Wang

    • Delft Univ of Tech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Nick van Loo

    • Delft Univ of Tech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Jouri Bommer

    • Delft Univ of Tech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Michiel de Moor

    • Delft Univ of Tech

  • Sasa Gazibegovic

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

  • Diana Car

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

  • Roy Op het Veld

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

  • Petrus van Veldhoven

    • Eindhoven Univ of Tech

  • Sebastian Koelling

    • Eindhoven Univ of Tech

  • Marcel Verheijen

    • Eindhoven Univ of Tech

  • John Logan

    • University of California Santa Barbara
    • Materials Department, University of California
    • University of California-Santa Barbara
    • University of California - Santa Barbara

  • Mihir Pendharkar

    • University of California Santa Barbara
    • Department of Electrical and Computer Engineering, University of California, Santa Barbara
    • University of California - Santa Barbara
    • Univ of California - Santa Barbara

  • Daniel Pennachio

    • University of California Santa Barbara

  • Borzoyeh Shojaei

    • University of California Santa Barbara

  • Joon Sue Lee

    • University of California Santa Barbara
    • California NanoSystems Institute, University of California, Santa Barbara
    • University of California - Santa Barbara
    • Materials Science, University of California - Santa Barbara
    • Univ of California - Santa Barbara

  • Chris Palmstrom

    • University of California Santa Barbara
    • Materials Department, California NanoSystems Institute, Electrical and Computer Engineering, University of California
    • University of California-Santa Barbara
    • California Nanosystems Institute, Dept. of Electrical and Computer Engineering, and Dept. of Materials, Univ of California - Santa Barbara
    • University of California - Santa Barbara
    • Electronics & Computer Enginneering, University of California Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials, University of California Santa Barbara
    • Univ of California - Santa Barbara

  • Erik Bakkers

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

  • Sankar Das Sarma

    • Univ of Maryland-College Park
    • University of Maryland

  • Leo Kouwenhoven

    • Microsoft Station-Q Delft, Delft University of Technology
    • Delft Univ of Tech
    • Qutech and Kavli Institute of Nanoscience and Microsoft Station Q Delft, Delft University of Technology
    • QuTech, Kavli Institute of Nanoscience, Station Q at Delft University of Technology, Delft University of Technology
    • Microsoft Station-Q at Delft University of Technology
    • Delft Univ. of Technology, Microsoft Station Q
    • Station Q Delft, Microsoft
    • Microsoft Station Q