Centers & Labs

RIKEN Center for Emergent Matter Science

Emergent Photodynamics Research Unit

Unit Leader: Naoki Ogawa (Ph.D.)
Naoki  Ogawa(Ph.D.)

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 Field


Related Research Fields

Engineering / Materials Sciences

Research Subjects

  • Photomagnetic effects via strong spin-orbit interactions
  • Photocontrol of spin current
  • Ultrafast optical spectroscopy/microscopy on strongly-correlated materials

Selected Publications

  1. 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).
  2. Ogawa, N., Seki, S., and Tokura, Y.
    "Ultrafast optical excitation of magnetic skyrmions"
    Sci. Rep. 5, 9552 (2015).
  3. Oike, H., Kagawa, F., Ogawa, N., Ueda, A., Mori, H., Kawasaki, M., and Tokura, Y.
    "Phase-change memory function of correlated electrons in organic conductors"
    Phys. Rev. B 91, 041101(R) (2015).
  4. Ogawa, N., Bahramy, M. S., Kaneko, Y., Tokura, Y.
    "Photocontrol of Dirac electrons in a Rashba semiconductor"
    Phys. Rev. B 90, 125122 (2014).
  5. Hatano, T., Ogimoto, Y., Ogawa, N., Nakano, M., Ono, S., Tomioka, Y., Miyano, K., Iwasa, Y., and Tokura, Y.
    "Gate Control of Electronic Phases in a Quarter-Filled Manganite"
    Sci. Rep. 3, 2904 (2013).
  6. 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).
  7. Ogawa, N., Ogimoto, Y., and Miyano, K.
    "Ultrafast dynamics of orbital-order-induced polarization"
    Appl. Phys. Lett. 102, 251911 (2013).
  8. 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).
  9. Ogawa, N., Mikaelian, G., and Ho, W.
    "Spatial variations in submolecular vibronic spectroscopy on a thin insulating film"
    Phys. Rev. Lett. 98, 166103 (2007).
  10. Wu, S. W., Ogawa, N., and Ho, W.
    "Atomic-Scale Coupling of Photons to Single-Molecule Junctions"
    Science 312, 1362-1365 (2006).

Lab Members

Principal Investigator

Naoki Ogawa
Unit Leader

Core Members

Masato Sotome
Postdoctoral Researcher

Contact information

Frontier Research Laboratory,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: naoki.ogawa [at]

Recent research results

September 25, 2015: RIKEN RESEARCH
A magnetic memory bubbling with opportunity