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Zero-bias photocurrent in ferromagnetic topological insulator

Author

Listed:
  • N. Ogawa

    (RIKEN Center for Emergent Matter Science (CEMS))

  • R. Yoshimi

    (University of Tokyo)

  • K. Yasuda

    (University of Tokyo)

  • A. Tsukazaki

    (Institute for Materials Research, Tohoku University)

  • M. Kawasaki

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

  • Y. Tokura

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

Abstract

Magnetic interactions in topological insulators cause essential modifications in the originally mass-less surface states. They offer a mass gap at the Dirac point and/or largely deform the energy dispersion, providing a new path towards exotic physics and applications to realize dissipation-less electronics. The nonequilibrium electron dynamics at these modified Dirac states unveil additional functions, such as highly efficient photon to spin-current conversion. Here we demonstrate the generation of large zero-bias photocurrent in magnetic topological insulator thin films on mid-infrared photoexcitation, pointing to the controllable band asymmetry in the momentum space. The photocurrent spectra with a maximal response to the intra-Dirac-band excitations can be a sensitive measure for the correlation between Dirac electrons and magnetic moments.

Suggested Citation

  • N. Ogawa & R. Yoshimi & K. Yasuda & A. Tsukazaki & M. Kawasaki & Y. Tokura, 2016. "Zero-bias photocurrent in ferromagnetic topological insulator," Nature Communications, Nature, vol. 7(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12246
    DOI: 10.1038/ncomms12246
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    Cited by:

    1. Masakazu Matsubara & Takatsugu Kobayashi & Hikaru Watanabe & Youichi Yanase & Satoshi Iwata & Takeshi Kato, 2022. "Polarization-controlled tunable directional spin-driven photocurrents in a magnetic metamaterial with threefold rotational symmetry," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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