Probing Spin-Orbit Coupling in InAs/Al SQUIDs

ORAL

Abstract

InAs/Al epitaxial heterostructures allow for transparent semiconductor/superconductor interfaces to study superconducting proximity effect, particularly in Josephson junctions. A superconducting quantum interference device (SQUID) constructed from such junctions opens the possibility of studying current-phase relations in these materials systems. One distinct property of this system is the gate-tunability where each junction can be depleted, effectively turning off the current in that junction. This allows for detailed analysis of the supercurrent properties not previously possible in a single device. The second important feature of this system is the presence of spin-orbit coupling in InAs, whose strength is gate-tunable. We study the SQUID signal as we tune the spin-orbit coupling in each arm using independent gate voltages. The comparison between experimental data and theoretical simulation suggests that spin-orbit coupling can be detected in SQUID signal. This direct probe of spin-orbit coupling in proximitized systems represents an important tool to study systems which potentially host Majorana fermions.

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Presenters

  • William Andrew Mayer

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

Authors

  • William Andrew Mayer

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

  • SiChao Yu

    Department of Physics, New York University, 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

  • Joseph Yuan

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

  • Narayan Mohanta

    Departiment of Physics and Astronomy, Wayne State University, Wayne State University, Physics, Wayne State University

  • Alex Matos Abiague

    Department of Physics and Astronomy, Wayne State University, Wayne State University Detroit, Departiment of Physics and Astronomy, Wayne State University, Wayne State University, Physics, Wayne State University

  • Igor Zutic

    University at Buffalo, The State University of New York, Department of Physics, State University of New York at Buffalo, Department of Physics, University at Buffalo, Physics, State Univ of NY - Buffalo, Physics, University at Buffalo, The State University of New York, Physics, State University of New York at Buffalo

  • 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