RIKEN Center for Emergent Matter Science Emergent Photodynamics Research Team

Team Leader: Naoki Ogawa (Ph.D.)

Japanese Page

Research Summary

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

Keywords

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

Sep. 25, 2015
A magnetic memory bubbling with opportunity

Lab Members

Principal investigator

Naoki Ogawa: Team Leader

Core members

Ziqian Wang: Postdoctoral Researcher
Shingo Toyoda: Special Postdoctoral Researcher

Careers

Position	Deadline
Seeking a Research scientist or Postdoctoral researcher (W20223)	Open until filled

Contact Information

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