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RIKEN Center for Emergent Matter Science Emergent Photodynamics Research Team

Team Leader: Naoki Ogawa (Ph.D.)

Research Summary

Naoki  Ogawa(Ph.D.)

Our team explores novel photodynamics of electron/magnon/phonon in bulk crystals and at thin-film interfaces emerging via electron-correlation, strong spin-orbit interaction, and topology. Examples are ultrafast spectroscopy of shift current, generation of spin current mediated by photoexcited Dirac/Weyl electrons, and manipulation of topological magnetic orders. With a strong command of photons, we try to realize new photo-electric/magnetic effects in solids, and visualize spatiotemporal propagation of various elementally excitations at the sub-diffraction limit.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering
  • Interdisciplinary Science & Engineering


  • Optical spectroscopy

Selected Publications

  • 1. Toyoda, S., Fiebig, M., Arima, T., Tokura, Y., and Ogawa, N.:
    "Nonreciprocal second harmonic generation in a magnetoelectric material"
    Sci. Adv. 7, eabe2793 (2021).
  • 2. Mogi, M., Yasuda, K., Fujimura, R., Yoshimi, R., Ogawa, N., Tsukazaki, A., Kawamura, M., Takahashi, K. S., Kawasaki, M., and Tokura, Y.:
    "Current-induced switching of proximity-induced ferromagnetic surface states in a topological insulator"
    Nature Commun. 12, 1404 (2021).
  • 3. Sotome, M., Ogaki, T., Takimiya, K., and Ogawa, N.:
    "Highly-efficient terahertz emission from hydrogen-bonded single molecular crystal"
    Opt. Express 29, 10048 (2021).
  • 4. Ogawa, N., Köhler, L., Garst, M., Toyoda, S., Seki, S., and Tokura, Y.:
    "Nonreciprocity of spin-waves in the conical helix state"
    Proc. Natl. Acad. Sci. 118, e2022927118 (2021).
  • 5. Hatada, H., Nakamura, M., Sotome, M., Kaneko, Y., Ogawa, N., Morimoto, T., Tokura, Y., and Kawasaki, M.:
    "Defect tolerant zero-bias topological photocurrent in a ferroelectric semiconductor"
    Proc. Natl. Acad. Sci. 117, 20411 (2020).
  • 6. Yokouchi, T., Sugimoto, S., Rana, B., Seki, S., Ogawa, N., Kasai, S., and Otani, Y.:
    "Creation of magnetic skyrmions by surface acoustic waves"
    Nature Nanotech. 15, 361 (2020).
  • 7. Sotome, M., Nakamura, M., Fujioka, J., Ogino, M., Kaneko, Y., Morimoto, T., Zhang, Y., Kawasaki, M., Nagaosa, N., Tokura, Y., and Ogawa, N.:
    "Spectral dynamics of shift-current in ferroelectric semiconductor SbSI"
    Proc. Natl. Acad. Sci. 116, 1929 (2019).
  • 8. Ogawa, N., Yoshimi, R., Yasuda, K., Tsukazaki, A., Kawasaki, M., and Tokura, Y.:
    "Zero-bias photocurrent in ferromagnetic topological insulator"
    Nature Commun. 7, 12246 (2016).
  • 9. Okada, K. N., Takahashi, Y., Yoshimi, R., Tsukazaki, A., Takahashi, K. S., Ogawa, N., Kawasaki, M., and Tokura, Y.:
    "Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state"
    Nature Commun. 7, 12245 (2016).
  • 10. Ogawa, N., Koshibae, W., Beekman, A. J., Nagaosa, N., Kubota, M., Kawasaki, M., and Tokura, Y.:
    "Photo-drive of magnetic bubbles via magnetoelastic waves"
    Proc. Natl. Acad. Sci. 112, 8977 (2015).

Recent Research Results

Related Links

Lab Members

Principal investigator

Naoki Ogawa
Team Leader

Core members

Ziqian Wang
Postdoctoral Researcher
Shingo Toyoda
Special Postdoctoral Researcher

Contact Information

Frontier Research Laboratory,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: naoki.ogawa [at] riken.jp