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.

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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