Observation of quantized conductance in quantum point contacts on near surface InAsSb quantum wells

ORAL

Abstract

Topological protection in Majorana Zero Mode (MZM) based quantum computation depends on the induced topological energy gap in the host superconductor-semiconductor hybrid system. Induced topological gap is in turn directly proportional to the spin-orbit coupling in the host system. Certain compositions of InAsSb are expected to have an enhanced spin-orbit coupling as compared to InAs and InSb, thus making InAsSb an ideal platform for robust and scalable topological networks. In this work, top gate control of electron density in near surface InAsSb 2DEGs has been demonstrated. Full depletion can be observed at relatively low top gate voltages, at 2K. Additionally, quantum point contacts on InAsSb 2DEGs show quantized conductance at zero-field at 2K. This work paves the way for coupling superconductivity and enabling the use of near surface InAsSb quantum wells as a host material system for MZM-based topological quantum computation.

*Microsoft Station Q Santa Barbara, Vannevar Bush Faculty Fellowship

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Presenters

  • Mihir Pendharkar

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Department of Electrical and Computer Engineering, University of California, Santa Barbara
    • Electrical and Computer Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • University of California, Santa Barbara

Authors

  • Mihir Pendharkar

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Department of Electrical and Computer Engineering, University of California, Santa Barbara
    • Electrical and Computer Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • University of California, Santa Barbara

  • Joon Sue Lee

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • California NanoSystems Institute, University of California, Santa Barbara
    • Department of Physics, The Pennsylvania State University
    • University of California, Santa Barbara

  • Michael A Seas

    • University of California, Santa Barbara
    • University of Wyoming

  • Anthony McFadden

    • University of California, Santa Barbara
    • ECE and Materials, University of California, Santa Barbara
    • University of California Santa Barbara

  • Taozhi Guo

    • University of California, Santa Barbara

  • Connor Dempsey

    • University of California, Santa Barbara

  • Sean Harrington

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

  • Daniel J Pennachio

    • University of California, Santa Barbara

  • Tobias Brown-Heft

    • University of California, Santa Barbara

  • Hadass Inbar

    • University of California, Santa Barbara

  • Chris Palmstrom

    • University of California, Santa Barbara
    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Electrical & Computer Engineering, University of California, Santa Barbara
    • ECE and Materials, University of California, Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara