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Zero-field edge plasmons in a magnetic topological insulator

Author

Listed:
  • Alice C. Mahoney

    (The University of Sydney)

  • James I. Colless

    (The University of Sydney
    University of California)

  • Lucas Peeters

    (Stanford University)

  • Sebastian J. Pauka

    (The University of Sydney)

  • Eli J. Fox

    (Stanford University
    SLAC National Accelerator Laboratory)

  • Xufeng Kou

    (University of California
    ShanghaiTech University)

  • Lei Pan

    (University of California)

  • Kang L. Wang

    (University of California)

  • David Goldhaber-Gordon

    (Stanford University
    SLAC National Accelerator Laboratory)

  • David J. Reilly

    (The University of Sydney
    Microsoft Station Q Sydney)

Abstract

Incorporating ferromagnetic dopants into three-dimensional topological insulator thin films has recently led to the realisation of the quantum anomalous Hall effect. These materials are of great interest since they may support electrical currents that flow without resistance, even at zero magnetic field. To date, the quantum anomalous Hall effect has been investigated using low-frequency transport measurements. However, transport results can be difficult to interpret due to the presence of parallel conductive paths, or because additional non-chiral edge channels may exist. Here we move beyond transport measurements by probing the microwave response of a magnetised disk of Cr-(Bi,Sb)2Te3. We identify features associated with chiral edge plasmons, a signature that robust edge channels are intrinsic to this material system. Our results provide a measure of the velocity of edge excitations without contacting the sample, and pave the way for an on-chip circuit element of practical importance: the zero-field microwave circulator.

Suggested Citation

  • Alice C. Mahoney & James I. Colless & Lucas Peeters & Sebastian J. Pauka & Eli J. Fox & Xufeng Kou & Lei Pan & Kang L. Wang & David Goldhaber-Gordon & David J. Reilly, 2017. "Zero-field edge plasmons in a magnetic topological insulator," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01984-5
    DOI: 10.1038/s41467-017-01984-5
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