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.

–

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