Type-II quantum spin Hall effect in two-dimensional metals

ORAL

Abstract

An experiment is proposed to measure the Type-II quantum spin Hall effect of an electron or hole in a two-dimensional (2D) metal. A long cylindrical solenoid lies normally through the inner radius of a 2D metallic Corbino disk. The currect Is surrounding the solenoid produces an azimuthal magnetic vector potential but no magnetic field in the disk. In addition, a radial electric field is generated across the disk by imposing either (1) a potential difference Δv or (2) a radial charge current I across its inner and outer radii. Combined changes in Is and in either Δv or I generate spontaneously quantized azimuthal charge and spin currents. The experiment is designed to measure these quantized azimuthal charge and spin currents in the disk consistently. The quantum Hamiltonians for experiments (1) and (2) are both solved exactly. A method to control the Joule heating is presented, which could potentially allow the Type-II quantum spin Hall measurements to be made at room temperature.

*A. Z. and Q. G. were supported by the National Natural Science Foundation of China through Grant no. 11874083. A. Z. was also supported by the China Scholarship Council. R. A. K. was partially supported by the U. S. Air Force Office of Scientific Research (AFOSR) LRIR #18RQCOR100, and the AFRL/SFFP Summer Faculty Fellowship Program provided by AFRL/RQ at WPAFB. Support for T. J. H. and T. J. B. was provided by AFOSR LRIR #18RQCOR100 and the U. S. Air Force Laboratory - Aerospace System Directorate (AFRL/RQ).

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Publication: Aiying Zhao et al. (2022) J. Phys.: Condens. Matter (in press) https://doi.org/10.1088/10.1088/1361-648X/ac9720
ArXiv (2022) 2204.01949

Presenters

  • Richard A Klemm

    • University of Central Florida

Authors

  • Richard A Klemm

    • University of Central Florida

  • Aiying Zhao

    • Institute of Theoretical Physics, University of Science and Technology Beijing, Beijing 100083, China

  • Qiang Gu

    • University of Science and Technology Beijing, Physics, Beijing, China
    • Institute of Theoretical Physics, University of Science and Technology Beijing, Beijing 100083, China

  • Timothy J Haugan

    • U. S. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio, 45433-7251, USA

  • Thomas J Bullard

    • U. S. Air Force Research Laboratory, Wright-Patterson Air Force Laboratory, Ohio 45433-7251 USA
    • UES Inc.