RIKEN Center for Emergent Matter Science Emergent Photodynamics Research Team
Team Leader: Naoki Ogawa (Ph.D.)
Research Summary

Our research unit explores novel photodynamics of electron/spin in bulk crystals and at thin-film interfaces emerging via electron-correlation and strong spin-orbit interactions. Examples are the spin current generation mediated by photoexcited Dirac electrons and the ultrafast coherent control/spectroscopy of topological spin textures. With a strong command of photons, we try to realize new photomagnetic effects in solids, and visualize the spatiotemporal propagation of elementally excitations at the sub-diffraction limit.
Main Research Fields
- Mathematical & Physical Sciences
Related Research Fields
- Engineering
Keywords
- Optical spectroscopy
Selected Publications
- 1.Bahramy, M. S. and Ogawa, N.
"Bulk Rashba Semiconductor and Related Quantum Phenomena"
Adv. Mater. 1605911 (2017). - 2.Sheu, Y. M., Ogawa, N., Kaneko, Y., and Tokura, Y.
"Photocreating supercooled spiral-spin states in a multiferroic manganite"
Phys. Rev. B 94, 081107(R) (2016). - 3.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). - 4.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). - 5.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, 8977-8981 (2015). - 6.Ogawa, N., Seki, S., and Tokura, Y.
"Ultrafast optical excitation of magnetic skyrmions"
Sci. Rep. 5, 9552 (2015). - 7.Ogawa, N., Bahramy, M. S., Kaneko, Y., Tokura, Y.
"Photocontrol of Dirac electrons in a Rashba semiconductor"
Phys. Rev. B 90, 125122 (2014). - 8.Ogawa, N., Bahramy, M. S., Murakawa, H., Kaneko, Y., and Tokura, Y.
"Magnetophotocurrent in BiTeI with Rashba spin-split bands"
Phys. Rev. B 88, 035130 (2013). - 9.Ogawa, N., Ogimoto, Y., Ida, Y., Nomura, Y., Arita, R., and Miyano, K.
"Polar antiferromagnets produced with orbital-order"
Phys. Rev. Lett. 108, 157603 (2012). - 10.Wu, S. W., Ogawa, N., and Ho, W.
"Atomic-Scale Coupling of Photons to Single-Molecule Junctions"
Science 312, 1362-1365 (2006).
Recent Research Results
Sep. 25, 2015
A magnetic memory bubbling with opportunity
Related Links
Lab Members
Principal investigator
- Naoki Ogawa
- Team Leader
Core members
- Masato Sotome
- 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