Condensed-Matter Science Lab.

Department of Materials Science, School of Fundamental Science and Engineering
Faculty of Science and Engineering, Waseda University, Tokyo, JAPAN


We mainly focus on the basic research of the properties of solid state materials with the assistance of the quantum theory. Especially, influence of the defects or dopants on the properties of solid materials is studied with the aid of experimental and computational techniques.

Recent Topics


  1. Theoretical and Experimental Investigations of Mn4+ Site Occupation in CaAl12O19
    M. Sagayama, M. Subhoni U. Zafari, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, T. Yamamoto
    ECS J. Solid State Sci. Tech. 10 (2021) 076004.
  2. Evaluation of Damage Coefficient for Minority-Carrier Diffusion Length of Triple-Cation Perovskite Solar Cells under 1-MeV Electron Irradiation for Space Applications
    Y. Miyazawa, G. Kim, A. Ishii, M. Ikegami, T. Miyasaka, Y. Suzuki, T. Yamamoto, T. Ohshima, S. Kanaya, H. Toyota, K. Hirose
    J. Phys. Chem. C 125 (2021) 13131-13137.
  3. Origin of room-temperature ferromagnetism in Co-doped CeO2
    K. Tarui, T. Oomori, Y. Ito, and T. Yamamoto
    Physica B 619 (2021) 413158.
  4. First principles analysis of crystal structure, electronic and optical properties of CsSnI3-xBrx perovskite for photoelectric applications
    D. D. Nematov, A. S. Burhonzoda, M. A. Khusenov, Kh. T. Kholmurodov, and T. Yamamoto
    J. Surf. Investigation: X-ray, Synchrotron and Neutron Techniques 15 (2021) 532-536.
  5. Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content
    K. T. Nguyen, V. H. Vuong, T. N. Nguyen, T. T. Nguyen, T. Yamamoto, N. N. Hoang
    Nature Comm. 12 (2021) 1560.
  6. First-principles investigations of geometrical and electronic structures of Mn4+ doped A2SiF6 (A= K, Rb, Cs) red phosphors
    M. Subhoni, U. Zafari, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, and T. Yamamoto
    Opt. Mat. 115 (2021) 110986.
  7. Recent progress in nanostructured functional materials and their applications
    T. Yamamoto, M. Yoshiya, and N.N. Hoang
    Mater. Trans. 61 (2020) 2435-2441.
  8. Proton Irradiation Tolerance of High-Efficiency Perovskite Absorbers for Space Applications
    S. Kanaya, G-M Kim, M. Ikegami, T. Miyasaka, K. Suzuki, Y. Miyazawa, H. Toyota, K. Osonoe, T. Yamamoto, and K. Hirose
    J. Phys. Chem. Lett. 10 (2019) 6990-6995
  9. Universal topological representation of geometric patterns
    S. Ohmori, Y. Yamazaki, T. Yamamoto, and A. Kitada Physica Scripta 94 (2019) 105213
  10. Theoretical investigation of the breakdown electric field of SiC polymorphs
    K. Yamaguchi, D. Kobayashi, T. Yamamoto, and K. Hirose
    Physica B532 (2018) 99-102
  11. Degradation of CH3NH3PbI3 provskite due to soft X-ray irradiation as analyzed by an X-ray photoelectron spectroscopy time-dependent measurement method
    K. Motoki, Y. Miyazawa, D. Kobayashi, M. Ikegami, T. Miyasaka, T. Yamamoto, and K. Hirose
    J. Appl. Phys. 121 (2017) 085501
  12. A valence state evaluation of a positive electrode material in an Li-ion battery with first principles K- and L-edge XANES spectral simulations and resonance photoelectron spectroscopy
    K. Kubobuchi, M. Mogi, M. Matsumoto, T. Baba, C. Yogi, C. Sato, T. Yamamoto, T. Mizoguchi and H. Imai
    J. Appl. Phys. 120 (2016) 142125
  13. Local environment analysis of Fe ions in BaMgSiO4
    J. Kase, S. Shingaki, Y. Inaba, K. Meguro, H. Murata, T. Okajima and T. Yamamoto
    AIP-Conference Proceedings 1763, 050007 (2016)
  14. Existence of a polycrystal filled with an arbitrary finite number of self-similar crystals
    A. Kitada, S. Ohmori and T. Yamamoto
    J. Phys. Soc. Jpn. 85, 045001 (2016)