Spin transport in quantum Hall magnets

ORAL

Abstract

Recent nonlocal electrical measurements [Stepanov Petr, et al. Nature Physics 14.9, 907; Wei et.al Science 362, 229-233; Haoxin et.al ,arXiv:1904.11485] have revealed remarkable spin transport properties in devices that host various graphene quantum Hall magnet (QHM) states. I will discuss our efforts to understand several different aspects of these experiments: 1) using an electric circuit model, we provide an explanation for the finite range of bias voltages over which nonlocal voltages are observed across insulating magnetic states and 2) using a microscopic spin-wave theory we estimate the transmission probabilities of magnon-like collective modes across junctions between QHMs that have different Landau level filling factors.

*Work supported by DOE grant DE- FG02-02ER45958.

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Presenters

  • Chunli Huang

    • University of Texas at Austin

Authors

  • Chunli Huang

    • University of Texas at Austin

  • Nemin Wei

    • University of Texas at Austin

  • Allan MacDonald

    • University of Texas at Austin
    • Physics, University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • Department of Physics, The University of Texas at Austin