Condensed-Matter Science Lab.

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


RESEARCH TOPICS

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

RECENT PUBLICATIONS

  1. Mekhrdod S. Kurboniyon, Alok M. Srivastava, Bibo Lou, Dilshod D. Nematov, Amondulloi Burhonzoda, Tomoyuki Yamamoto, Chong-Geng Ma, and Mikhail G. Brik
    Thermal Quenching Mechanism of Mn4+ in Na2SiF6, NaKSiF6, and K2SiF6 Phosphors: Insights from the First-Principles Analysis
    Inorg. Chem. 63 (2924) 21212-21221.
    https://doi.org/10.1021/acs.inorgchem.4c03589
  2. Zafari Umar, Oleg Khyzhun, Mekhrdod S. Kurboniyon, Tomoyuki Yamamoto, Mikhail G. Brik, Mega Novita, Justyna Barzowska, and Michal Piasecki
    The Effect of Hydrostatic Pressure on Structure, Crystal-Field Strength, and Emission Properties of Neat and Ni2+-Activated KMgF3
    Adv. Theory Simul. (2024) 202400734
    https://doi.org/10.1002/adts.202400734
  3. Maksym Buryi, Vladimir Babin, Katerina Decka, Katarina Ridzonova, Neda Neykova, Frantisek Hajek, Zhivko Velkov, Zdenek Remes, Robert Tomala, Pawel Socha, Karol Bartosiewicz, Tomas Hostinsky, Petr Mosner, Tomoyuki Yamamoto, Chong-Geng Ma, Mikhail G. Brik
    Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch
    Opt. Mater. 151 (2024) 115279
    https://doi.org/10.1016/j.optmat.2024.115279
  4. Zafari Umar, Oleg Khyzhun, Tomoyuki Yamamoto, Piotr Bragiel
    Ab initio calculations of two-site occupation for substituting ions in MgTa2O6:Cr3+ phosphor: The geometric and electronic structures and optical transition energies
    Opt. Mater. 140 (2024) 115057
    https://doi.org/10.1016/j.optmat.2024.115057
  5. Kazuma Midorikawa, Sachiko Hiromoto, Tomoyuki Yamamoto
    Carbonate content control in carbonate apatite coatings of biodegradable magnesium
    Ceramics International 50 (2024) 6784-6792
    https://doi.org/10.1016/j.ceramint.2023.12.021
  6. First-Principles Calculations of the Electronic Structure and Mechanical Properties of Non-Doped and Cr3+-Doped K2LiAlF6 Under Pressure
    Z. Umar, M. S. Kurboniyon, O. Khyzhun, T. Yamamoto, C.-G. Ma, M. G. Brik, M. Piasecki
    J. Lumin. 266 (2024) 120278
    https://doi.org/10.1016/j.jlumin.2023.120278
  7. A New Data Transformation and Resampling Approach for Prediction of Yield Strength of High-Entropy Alloys
    N. H. Chau, G. Sato, K. Utsugi, T. Yamamoto
    Proceedings of 15th Asian Conference of Intelligent Information and Database Systems, ACIIDS 2023. Lecture Notes in Computer Science, vol 13996. Springer, Singapore
    https://doi.org/10.1007/978-981-99-5837-5_1
  8. First-principles study of geometric and electronic structures, and optical transition energies of Mn4+ impurity ions: K2SiF6 as a prototype
    M. S. Kurboniyon, B. Lou, U. Zafari, F. Rahimi, A. M. Srivastava, T. Yamamoto, M. G. Brik, C-G. Ma
    J. Lumin. 263 (2023) 120103
    https://doi.org/10.1016/j.jlumin.2023.120103
  9. First-principles investigation of divalent ion sensing with cesium lead trihalides
    T. Yamamoto, R. Oonaga, H.C. Nguyen, V.H. Vuong, A.T. Nguyen, D.T. Bui, N.N. Hoang, N.D. Nguyen
    Opt. Mater.: X 19 (2023) 100253
    https://doi.org/10.1016/j.omx.2023.100253
  10. Geometrical and electronic structure analysis of Mn-doped CaMO3 (M = Ti, Zr and Sn)
    M. S. Kurboniyon, U. Zafari, C.-G. Ma, M. Piasecki, M. G. Brik, T. Yamamoto
    Phys. Status Solidi B 260 (2023) 2200575
    https://doi.org/10.1002/pssb.202200575
  11. Influence of co-doping of divalent ions on the photoluminescence intensity of Mn4+ doped CaAl12O19
    U. Zafari, M. Sagayama, M. Subhoni A. M. Srivastava, W. W. Beers, W. Cohen, C.-G. Ma, M. Piasecki, M. G. Brik, T. Yamamoto
    Opt. Mater.: X 16 (2022) 100197.
    https://doi.org/10.1016/j.omx.2022.100197
  12. Support Vector Machine-Based Phase Prediction of Multi-principal Element Alloys
    H.C. Nguyen, M. Kubo, V. H. Le, and T. Yamamoto
    Vietnam J. Comp. Sci. (2022)
    https://dx.doi.org/10.1142/S2196888822500312
  13. Influence of Isostatic Pressure on the Elastic and Electronic Properties of K2SiF6:Mn4+
    M. Subhoni U. Zafari, C.-G. Ma, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, M. Piasecki, T. Yamamoto
    Materials 15 (2022) 613.
    https://doi.org/10.3390/ma15020613
  14. 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.
    http://dx.doi.org/10.1149/2162-8777/ac13df
  15. 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.
    http://dx.doi.org/10.1021/acs.jpcc.1c01590
  16. Origin of room-temperature ferromagnetism in Co-doped CeO2
    K. Tarui, T. Oomori, Y. Ito, and T. Yamamoto
    Physica B 619 (2021) 413158.
    https://doi.org/10.1016/j.physb.2021.413158
  17. 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.
    http://dx.doi.org/10.1134/S1027451021030149
  18. 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.
    http://dx.doi.org/10.1038/s41467-021-21842-9
  19. 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.
    http://dx.doi.org/10.1016/j.optmat.2021.110986
  20. Recent progress in nanostructured functional materials and their applications
    T. Yamamoto, M. Yoshiya, and N.N. Hoang
    Mater. Trans. 61 (2020) 2435-2441.
    http://dx.doi.org/10.1016/j.actamat.2020.04.048
  21. 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
    http://dx.doi.org/10.1021/acs.jpclett.9b02665
  22. Universal topological representation of geometric patterns
    S. Ohmori, Y. Yamazaki, T. Yamamoto, and A. Kitada Physica Scripta 94 (2019) 105213
    http://dx.doi.org/10.1088/1402-4896/ab2946
  23. Theoretical investigation of the breakdown electric field of SiC polymorphs
    K. Yamaguchi, D. Kobayashi, T. Yamamoto, and K. Hirose
    Physica B532 (2018) 99-102
    http://dx.doi.org/10.1016/j.physb.2017.03.042
  24. 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
    http://dx.doi.org/10.1063/1.4977238
  25. 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
    http://dx.doi.org/10.1063/1.4963379
  26. 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)
    https://doi.org/10.1063/1.4961360
  27. 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)
    http://dx.doi.org/10.7566/JPSJ.85.045001

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