Measurements of cyclotron resonance of the interfacial states in strong-spin orbit coupled 2D electron gases proximitized with aluminum

ORAL

Abstract

The two-dimensional electron gas (2DEG) in InAs proximitized by aluminum (Al) is a promising platform for topological qubits based on Majorana zero modes. However, there are still substantial uncertainties associated with the nature of the electronic states at the interfaces of these systems. In this work, we have investigated InAs quantum well heterostructures with In0.8Ga0.2As or In.85Al.15As barrier and Al overlayers using high precision time-domain THz spectroscopy. In magnetic field, a prominent cyclotron resonance is observed that can be associated with the response of the interfacial states. Measurements of the THz range complex Faraday rotation allow the extraction of the sign and magnitude of the effective mass, the density of charge carriers, and scattering times. We compare the results of measurements with numerical calculations

*Funding support for work at The Johns Hopkins University and Purdue University is from Microsoft Quantum

–

Presenters

  • Prashant Chauhan

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore 21218

Authors

  • Prashant Chauhan

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore 21218

  • Candice Thomas

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • CEA, LETI, MINATEC Campus, 38054 Grenoble, France
    • Department of Physics and Astronomy, Purdue University

  • Tyler Lindemann

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Department of Physics and Astronomy, Purdue University

  • Geoff C Gardner

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University

  • Jan Gukelberger

    • Quantum Architecture and Computation Group, Microsoft Research, Redmond, Washington 98052, USA

  • Roman Lutchyn

    • Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA
    • Microsoft Station Q Santa Barbara
    • Microsoft Corp

  • Michael Manfra

    • Purdue University
    • Purdue Univ
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Department of Physics and Astronomy, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Peter Armitage

    • Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore 21218
    • Department of Physics and Astronomy, Johns Hopkins University