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D.Sc., Kyoto University, 1987


Condensed Matter Experiments

Phone/Fax +81-78-803-5647


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Research Description

Our interest lies in the fundamental properties and phenomena in the optical science related with the coherent and nonlinear interaction between the light and matter.
Recent research subjects are studies of ultrafast spin and lattice dynamics in condensed matter, magnetic and dielectric materials, using femtosecond laser spectroscopy and terahertz time-domain spectroscopy.

Main Publications

  • T. Kohmoto, D. Ikeda, X. Liang, and T. Moriyasu,
    Direct observation of the spatial and temporal dynamics of polaron diffusion in SrTiO3,
    Phys. Rev. B 87, 214301 (2013).
  • T. Moriyasu, S. Wakabayashi, and T. Kohmoto,
    Observation of antiferromagnetic magnons and magnetostriction in manganese oxide using terahertz time-domain spectroscopy,
    J. Infrared Milli. Terahz. Waves 34, 277 (2013).
  • M. Takahara, H. Jinn, S. Wakabayashi, T. Moriyasu, and T. Kohmoto,
    Observation of coherent acoustic phonons and magnons in an antiferromagnet NiO,
    Phys. Rev. B 86, 094301 (2012).
  • T. Kohmoto, M. Masui, M. Abe, T. Moriyasu, and K. Tanaka,
    Ultrafast dynamics of soft phonon modes in perovskite dielectrics observed by coherent phonon spectroscopy,
    Phys. Rev. B 83, 064304 (2011).
  • Y. Koyama, T. Moriyasu, H. Okamura, Y. Yamada, K. Tanaka, T. Kohmoto,
    Doping-induced ferroelectric phase transition in strontium titanate: Observation of birefringence and coherent phonons under ultraviolet illumination,
    Phys. Rev. B 81, 024104 (2010).
  • T. Moriyasu, D. Nomoto, Y. Koyama, Y. Fukuda, and T. Kohmoto,
    Spin manipulation using the light-shift effect in rubidium atoms,
    Phys. Rev. Lett. 103, 213602 (2009).
  • T. Kohmoto, H. Sakaguchi, M. Takahashi, K. Kakita, Y. Koyama, and T. Moriyasu,
    Optically induced magnetization and ultrafast spin relaxation in manganese oxide,
    Phys. Rev. B 78, 144420 (2008).
  • T. Moriyasu, Y. Koyama, Y. Fukuda, and T. Kohmoto,
    Optically induced spin echoes in rubidium atoms: On- and off-resonant manipulations of spins,
    Phys. Rev. A 78, 013402 (2008).

last update 14 April 2015
Department of Physics, Graduate School of Science / Faculty of Science, Kobe University
1-1 Rokkodai, Nada-ku, Kobe, 657-8501 JAPAN