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Band structure probe of near Surface InAs Quantum Wells

ORAL

Abstract

Near surface InAs quantum wells (QW) have recently attracted a great deal of interest as tools to explore mesoscopic and topological superconductivity. These shallow QWs can interact strongly with superconducting layers which can be epitaxially grown on their surfaces. In this talk, we present a combined experimental and theoretical approach to study the band structure of these QWs. The effective mass and g-factors in these QWs were determined using high field cyclotron resonance (CR). Unlike GaAs, narrow gap systems like InAs have large nonparabolicity in their band structures.The band parameters extracted from our CR experiments are consistent with those obtained from Shubnikov de Hass measurements and agree remarkably well with the theoretical calculations. Our band structure models include strong mixing of the conduction and valence bands which leads to a large non-parabolicity. The calculations accurately describe the experimental observations and allowing us to accurately map the effective mass and g-factor as a function of magnetic field, Landau level index, and the well width for different near surface InAs QWs.

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Presenters

  • Brenden A Magill

    Virginia Tech

Authors

  • Brenden A Magill

    Virginia Tech

  • Giti Khodaparast

    Virginia Tech

  • Sunil K Thapa

    University of Florida, Univ. of Florida

  • Christopher J Stanton

    Univ. of Florida, University of Florida

  • Joseph Yuan

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

  • Mehdi Hatefipour

    New York University, New York Univ NYU, Department of Physics, New York University

  • William Mayer

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

  • Matthieu Dartiailh

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

  • Kasra Sardashti

    New York University, New York Univ NYU, Physics, New York University, Center for Quantum Phenomena, NYU

  • Kaushini S Wickramasinghe

    New York University, Physics, New York University, University of Maryland, College Park, Center for Quantum Phenomena, New York University, New York Univ NYU, Department of Physics, New York University

  • Javad Shabani

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

  • Y. H. Matsuda

    University of Tokyo, Univ. of Tokyo, Institute for Solid State Physics, University of Tokyo

  • Zhuo Yang

    University of Tokyo, Univ. of Tokyo

  • Yoshimitsu Kohama

    Tokyo University, University of Tokyo, Univ. of Tokyo, ISSP, The University of Tokyo