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Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state

Author

Listed:
  • Ken N. Okada

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • Youtarou Takahashi

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo
    PRESTO, Japan Science and Technology Agency (JST))

  • Masataka Mogi

    (University of Tokyo)

  • Ryutaro Yoshimi

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • Atsushi Tsukazaki

    (PRESTO, Japan Science and Technology Agency (JST)
    Institute for Materials Research, Tohoku University)

  • Kei S. Takahashi

    (RIKEN Center for Emergent Matter Science (CEMS)
    PRESTO, Japan Science and Technology Agency (JST))

  • Naoki Ogawa

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Masashi Kawasaki

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • Yoshinori Tokura

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

Abstract

Electrodynamic responses from three-dimensional topological insulators are characterized by the universal magnetoelectric term constituent of the Lagrangian formalism. The quantized magnetoelectric coupling, which is generally referred to as topological magnetoelectric effect, has been predicted to induce exotic phenomena including the universal low-energy magneto-optical effects. Here we report the experimental indication of the topological magnetoelectric effect, which is exemplified by magneto-optical Faraday and Kerr rotations in the quantum anomalous Hall states of magnetic topological insulator surfaces by terahertz magneto-optics. The universal relation composed of the observed Faraday and Kerr rotation angles but not of any material parameters (for example, dielectric constant and magnetic susceptibility) well exhibits the trajectory towards the fine structure constant in the quantized limit.

Suggested Citation

  • Ken N. Okada & Youtarou Takahashi & Masataka Mogi & Ryutaro Yoshimi & Atsushi Tsukazaki & Kei S. Takahashi & Naoki Ogawa & Masashi Kawasaki & Yoshinori Tokura, 2016. "Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state," Nature Communications, Nature, vol. 7(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12245
    DOI: 10.1038/ncomms12245
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    Cited by:

    1. Junyeong Ahn & Su-Yang Xu & Ashvin Vishwanath, 2022. "Theory of optical axion electrodynamics and application to the Kerr effect in topological antiferromagnets," Nature Communications, Nature, vol. 13(1), pages 1-17, December.

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