Magneto-transport in near surface InAs quantum wells in contact with NbTiN

ORAL

Abstract

Indium Arsenide (InAs) near surface quantum wells have become the recent focus in topological superconductivity for their use in heterostructures with superconductors. An interface between a superconductor and a quantum Hall edge is predicted to exhibit excitations with non-abelian statistics. A promising candidate for this phenomenon is NbTiN, which can sustain strong magnetic fields in proximity to InAs, which hosts integer quantum Hall states. In this work, we study the proximity effect by monitoring the current flow along the superconductor-semiconductor interface. We find that enhanced conductance could be due to Andreev reflections in the quantum hall regime. In further characterization, we fabricate a hybrid device containing both a superconductor-semiconductor interface and a normal-semiconductor interface, in order to separate the normal and Andreev reflections in presence of strong magnetic fields.
Sandia National Laboratories is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.

*This work was supported partially by NSF EAGER under award number DMR-1836687 and the MRSEC Program of the National Science Foundation under Award Number DMR-1420073.

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Presenters

  • Mehdi Hatefipour

    • NYU
    • New York Univ NYU

Authors

  • Mehdi Hatefipour

    • NYU
    • New York Univ NYU

  • William a Mayer

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

  • Noah Kurt Goss

    • New York Univ NYU

  • William Strickland

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

  • Joseph Yuan

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

  • Kaushini S Wickramasinghe

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

  • Kasra Sardashti

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

  • Tzu-Ming Lu

    • Sandia National Laboratories
    • Sandia National Laboratories, Center for Integrated Nanotechnologies
    • Center for Integrated Nanotechnologies, Sandia National Laboratories

  • Javad Shabani

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