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Enhanced gyrotropic birefringence and natural optical activity on electromagnon resonance in a helimagnet

Author

Listed:
  • S. Iguchi

    (University of Tokyo)

  • R. Masuda

    (University of Tokyo)

  • S. Seki

    (University of Tokyo
    University of Tokyo)

  • Y. Tokura

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

  • Y. Takahashi

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

Abstract

Spontaneous symmetry breaking in crystalline solid often produces exotic nonreciprocal phenomena. As one such example, the unconventional optical rotation with nonreciprocity, which is termed gyrotropic birefringence, is expected to emerge from the magnetoelectric coupling. However, the fundamental nature of gyrotropic birefringence remains to be examined. Here w`e demonstrate the gyrotropic birefringence enhanced by the dynamical magnetoelectric coupling on the electrically active magnon resonance, i.e. electromagnon, in a multiferroic helimagnet. The helical spin order having both polarity and chirality is found to cause the giant gyrotropic birefringence in addition to the conventional gyrotropy, i.e. natural optical activity. It is demonstrated that the optical rotation of gyrotropic birefringence can be viewed as the nonreciprocal rotation of the optical principal axes, while the crystallographic and magnetic anisotropies are intact. The independent control of the nonreciprocal linear (gyrotropic birefringence) and circular (natural optical activity) birefringence/dichroism paves a way for the optically active devices.

Suggested Citation

  • S. Iguchi & R. Masuda & S. Seki & Y. Tokura & Y. Takahashi, 2021. "Enhanced gyrotropic birefringence and natural optical activity on electromagnon resonance in a helimagnet," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26953-x
    DOI: 10.1038/s41467-021-26953-x
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    References listed on IDEAS

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    1. T. Kimura & T. Goto & H. Shintani & K. Ishizaka & T. Arima & Y. Tokura, 2003. "Magnetic control of ferroelectric polarization," Nature, Nature, vol. 426(6962), pages 55-58, November.
    2. D. I. Khomskii, 2014. "Magnetic monopoles and unusual dynamics of magnetoelectrics," Nature Communications, Nature, vol. 5(1), pages 1-4, December.
    3. S. Kibayashi & Y. Takahashi & S. Seki & Y. Tokura, 2014. "Magnetochiral dichroism resonant with electromagnons in a helimagnet," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    4. Yoshinori Tokura & Naoto Nagaosa, 2018. "Nonreciprocal responses from non-centrosymmetric quantum materials," Nature Communications, Nature, vol. 9(1), pages 1-14, December.
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