Enhancing Superconductivity in Indium Arsenide Quantum Well Heterostructures

ORAL

Abstract

Hybrid superconductor-semiconductor heterostructures containing indium arsenide quantum wells combine strong spin-orbit effects, s-wave superconductivity, and arbitrary lithographic confinement. This platform facilitates both study of induced superconductivity in the quantum well and topological states in quasi-one-dimensional systems. While epitaxial aluminum provides transparent contact to the quantum well, aluminum cannot sustain large magnetic fields (>1 T) required to explore many topological effects. Further, the small (150 µeV) superconducting gap of aluminum can complicate detection and inhibit manipulation of states required for applications to topological quantum computing. In this work, we present a method of coupling niobium-based superconductors to indium arsenide quantum wells to supplement the critical magnetic field and superconducting gap in this platform. Experimental progress on fabrication of superconductor-semiconductor-superconductor (SNS) junctions and quantum point contacts will be presented.

*This work was supported by the Center for Integrated Quantum Materials (DMR-1231319) and National Science Foundation (DMR-1708688 and DMR-1836687).

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Presenters

  • Andrew Saydjari

    • Physics, Harvard University

Authors

  • Andrew Saydjari

    • Physics, Harvard University

  • Michael Kosowsky

    • Harvard University
    • Physics, Harvard University

  • Andrew T Pierce

    • Harvard University
    • Physics, Harvard University

  • Joseph Yuan

    • Department of Physics, New York University
    • Physics, New York University
    • Center for Quantum Phenomena, Department of Physics, New York University

  • Kaushini Wickramasinghe

    • University of Oklahoma
    • Department of Physics, New York University
    • Physics, New York University
    • Physics, University of Maryland, College Park
    • Center for Quantum Phenomena, Department of Physics, New York University
    • University of Maryland, College Park

  • Javad Shabani

    • Department of Physics, New York University
    • Physics, New York University
    • Center for Quantum Phenomena, Department of Physics, New York University
    • Center for Quantum Phenomena, New York University
    • New York University
    • Physics, Harvard University

  • Amir Yacoby

    • Harvard University
    • Harvard Univ
    • Physics, Harvard University
    • Department of Physics, Harvard University & School of Engineering and Applied Sciences, Harvard University