Kazuaki Kawahara




Yayoi 2-11-16, Bunkyo-ku, Tokyo, Japan, 113-8656
Phone +81-3-5841-7689
Fax +81-3-5841-7694
mail: kawahara_sigma.t.u-tokyo.ac.jp(please insert @ instead of space)



Contents

  • Profile
  • Current Research
  • Publication list


    • Profile



    Education


  • March 2012   B.S. in Engineering
    (Department of Applied Chemistry, School of Engineering, the University of Tokyo)

  • March 2017    Ph.D. in Science
    (Department of Advanced Materials Science, Graduate School of Frontier Sciences, the University of Tokyo)


    • Professional Experience


  • August 2020 - present Assistant professor, Institute of Engineering Innovation, School of Engineering, the University of Tokyo

  • June 2017 - July 2020 Postdoctoral fellow, Institute of Engineering Innovation, School of Engineering, the University of Tokyo

  • April 2017 - May 2017   Postdoctoral fellow, Department of Advanced Materials Science, Graduate School of Frontier Sciences, the University of Tokyo

  • April 2015 - March 2017   JSPS research fellow (DC)




    • Current Research



    Atomic and electronic structure of surfaces




    Achievements



    Publication

    1. K. Kawahara, R. Ishikawa, S. Sasano, N. Shibata, Y. Ikuhara. “La1-xSrxF3-x: A Solid-State Electrolyte for Fluoride Ion Battery with High Ionic Conductivity and Wide Electrochemical Potential Window”. Journal of the Electrochemical Society, 171, 110508 (2024).
    2. S. Sasano, R. Ishikawa, K. Kawahara, N. Shibata, Y. Ikuhara. “Highly Reversible Conversion-Type CoSn2 Cathode for Fluoride-Ion Batteries”. Small, 2408023 (2024).
    3. S. Sasano, R. Ishikawa, K. Kawahara, N. Shibata, Y. Ikuhara. “フッ化物電池用LaAl3負極の開発・微細構造解析”. Ceramics, 59, 698-701 (2024).
    4. K. Kawahara, R. Ishikawa, S. Sasano, N. Shibata, Y. Ikuhara. “Total Third-Degree Variation for Noise Reduction in Atomic-Resolution STEM Images”. Microscopy, 73, dfae031 (2024).
    5. T. Kusumi, S. Katakami, R. Ishikawa, K. Kawahara, T. Mullarkey, J. M. Bekkevold, J. J. P. Peters, L. Jones, N. Shibata, M. Okada. “New Poisson denoising method for pulse-count STEM imaging”. Ultramicroscopy, 264, 113996 (2024).
    6. R. Ishikawa, T. Futazuka, Y. Jimbo, K. Kawahara, N. Shibata, Y. Ikuhara. “Real-time tracking of three-dimensional atomic dynamics of Pt trimer on TiO2 (110)”. Science Advances, 10, adk6501 (2024).
    7. S. Sasano, R. Ishikawa, K. Kawahara, N. Shibata, Y. Ikuhara. “La-Al Intermetallic Alloy Anode for Realizing High-Energy Fluoride-Ion Battery”. Journal of Electrochemical Society, 170, 120523 (2023).
    8. T. Kusumi, S. Katakami, R. Ishikawa, K. Kawahara, N. Shibata, M. Okada. “Fast reconstruction of scanning transmission electron microscopy images using Markov random field model”. Ultramicroscopy, 253, 113811 (2023).
    9. K. Kawahara, R. Ishikawa, N. Shibata, Y. Ikuhara. “Fluoride Ion Conductivity of Rb Doped KSbF4”. Journal of Electrochemical Society, 170, 020528 (2023).
    10. S. Sasano, R. Ishikawa, K. Kawahara, A. Mineshige, N. Shibata, Y. Ikuhara. “Formation of La-rich tysonite nano-precipitates in fluorite Ba0.6La0.4F2.4”. Journal of Power Sources, 557, 232581 (2023).
    11. N. Kawakami, R. Arafune, E. Minamitani, K. Kawahara, N. Takagi, C.-L. Lin. “Anomalous dewetting growth of Si on Ag(111)”. Nanoscale, 14, 14623 (2022).
    12. K. Kawahara, R. Ishikawa, S. Sasano, N. Shibata, Y. Ikuhara. “Atomic-resolution STEM image denoising by total variation regularization”. Microscopy, 71, 302 (2022).
    13. S. Kobayashi, D. Yokoe, Y. Fujiwara, K. Kawahara, Y. Ikuhara, A. Kuwabara. “Lithium Lanthanum Titanate Single Crystals: Dependence of Lithium-Ion Conductivity on Crystal Domain Orientation”. Nano Letters, 22, 5516 (2022).
    14. Y. H. Ikuhara, X. Gao, K. Kawahara, C. A. J. Fisher, A. Kuwabara, R. Ishikawa, H. Moriwake, Y. Ikuhara. “Atomic-Level Changes during Electrochemical Cycling of Oriented LiMn2O4 Cathodic Thin Films”. ACS Applied Materials and Interfaces, 14, 6507 (2022).
    15. R. Ishikawa, R. Tanaka, K. Kawahara, N. Shibata, Y. Ikuhara. “Atomic-Resolution Topographic Imaging of Crystal Surfaces”. ACS Nano, 15, 9186 (2021).
    16. K. Inoue, J.-Y. Roh, K. Kawahara, M. Saito, M. Kotani, Y. Ikuhara. “Arrangement of polyhedral units for [0001]-symmetrical tilt grain boundaries in zinc oxide”. Acta Materialia, 212, 116864 (2021).
    17. K. Kawahara, R. Ishikawa, K. Nakayama, N. Shibata, Y. Ikuhara. “Room temperature fluoride ion conductivity in defective β-KSb1-δF4-3δ”. Journal of Power Sources, 483, 229173 (2021).
    18. K. Inoue, K. Kawahara, M. Saito, M. Kotani, Y. Ikuhara. “3D arrangement of atomic polyhedral in tilt grain boundaries”. Acta Materialia, 202, 266-276 (2021).
    19. S. Sasano, R. Ishikawa, K. Kawahara, T. Kimura, Y. H. Ikuhara, N. Shibata, Y. Ikuhara. “Grain boundary Li-ion conductivity in (Li0.33La0.56)TiO3 polycrystal”. Applied Physics Letters, 116, 043901 (2020).
    20. Z. Ni, E. Minamitani, K. Kawahara, R. Arafune, C.-L. Lin, N. Takagi, S. Watanabe. “Mechanically Tunable Spontaneous Vertical Charge Redistribution in Few-Layer WTe2”. The Journal of Physical Chemistry C, 124, 2008-2012 (2020).
    21. K. Kawahara, R. Ishikawa, K. Nakayama, T. Higashi, Y. H. Ikuhara, T. Kimura, N. Shibata, Y. Ikuhara. “Fast Li-ion conduction at grain boundaries in (La,Li)NbO3 polycrystals”. Journal of Power Sources, 441, 227187 (2019).
    22. K. Kawahara, R. Ishikawa, T. Higashi, Y. H. Ikuhara, T. Kimura, N. Shibata, Y. Ikuhara, “Unique fitting of electrochemical impedance spectra by random walk Metropolis Hastings algorithm”, Journal of Power Sources 403, 184-191 (2018).
    23. C.-L. Lin, R. Arafune, R.-Y. Liu, M. Yoshimura, B. Feng, K. Kawahara, Z. Ni, E. Minamitani, S. Watanabe, Y. Shi, M. Kawai, T.-C. Chiang, I. Matsuda, N. Takagi, “Visualizing Type-II Weyl Points in Tungsten Ditelluride by Quasiparticle Interference” ACS Nano 11, 11459-11465 (2017).
    24. N. Kawakami, C.-L. Lin, K. Kawahara, M. Kawai, R. Arafune, N. Takagi, “Structural evolution of Bi thin films on Au(111) revealed by scanning tunneling microscopy” Physical review B 96, 205402 (2017).
    25. K. Kawahara, Z. Ni, R. Arafune, T. Shirasawa, C.-L. Lin, E. Minamitani, S. Watanabe, M. Kawai, N. Takagi, “Surface structure of novel semimetal WTe2”, Applied Physics Express 10, 045702 (2017).
    26. K. Kawahara, T. Shirasawa, C.-L. Lin, R. Nagao, N. Tsukahara, T. Takahashi, R. Arafune, M. Kawai, N. Takagi, “Atomic structure of “multilayer silicene” grown on Ag(111): dynamical low energy electron diffraction analysis”, Surface Science 651, 70-75 (2016).
    27. C.-L. Lin, T. Hagino, Y. Ito, K. Kawahara, R. Nagao, M. Aoki, S. Masuda, R. Arafune, M. Kawai, N. Takagi, “Spectroscopic Identification of Ag-terminated “Multilayer Silicene” Grown on Ag(111)”, The Journal of Physical Chemistry C 120, 6689-6693 (2016).
    28. K. Kawahara, R. Arafune, M. Kawai, N. Takagi, “Pragmatic Application of Abstract Algebra to Two-Dimensional Lattice Matching”, e-Journal of Surface Science and Nanotechnology 13, 361-365 (2015).
    29. N. Takagi, C.-L. Lin, K. Kawahara, E. Minamitani, N. Tsukahara, M. Kawai, and R. Arafune, “Silicene on Ag(111): Geometric and electronic structures of a new honeycomb material of Si”, Progress in Surface Science 90, 1-20 (2015).
    30. K. Kawahara, T. Shirasawa, R. Arafune, C.-L. Lin, T. Takahashi, M. Kawai, N. Takagi, ‘’Determination of atomic positions in silicene on Ag(111) by low-energy electron diffraction’’, Surface Science 623, 25-28 (2014).
    31. C.-L. Lin, R. Arafune, K. Kawahara, M. Kanno, N. Tsukahara, E. Minamitani, Y. Kim, M. Kawai, N. Takagi, “Substrate-Induced Symmetry Breaking in Silicene” Physical Review Letters 110, 076801 (2013).
    32. R. Arafune, C.-L. Lin, K. Kawahara, N. Tsukahara, E. Minamitani, Y. Kim, N. Takagi, M. Kawai, “Structural transition of silicene on Ag(111)” Surface Science 608, 297-300 (2013).
    33. C.-L. Lin, R. Arafune, K. Kawahara, N.Tsukahara, E. Minamitani, Y. Kim, N. Takagi, M. Kawai, “Structure of Silicene Grown on Ag(111)” Applied Physics Express 5, 045802 (2012).


    International Conference

    1. K. Kawahara, R. Ishikawa, N. Shibata, Y. Ikuhara. “Fluoride ion conductivity of Rb-doped KSbF4” Pacific Rim International Meeting of the Electrochemical Society (PRiME) 2024, Honolulu, USA, October 2024.
    2. K. Kawahara, R. Ishikawa, N. Shibata, Y. Ikuhara. “Fluoride ion conductivity of Cs-doped KSbF4” 23rd International Conference on Solid State Ionics, Boston, USA, July 2022.
    3. K. Kawahara, R. Ishikawa, K. Nakayama, N. Shibata, Y. Ikuhara. “Fluoride ion conductivity of potassium tetrafluoroantimonate” The 14th Pacific Rim Conference of Ceramic Societies, Online, December 2021.
    4. K. Kawahara, R. Ishikawa, K. Nakayama, T. Higashi, T. Kimura, Y. H. Ikuhara, N. Shibata, Y. Ikuhara. “Atomic structure and Li-ion conductivity of (La,Li)NbO3 electrolyte” The 13th Pacific Rim Conference of Ceramic Societies, Okinawa, Japan, October 2019.
    5. K. Kawahara, R. Ishikawa, K. Nakayama, T. Higashi, Y. H. Ikuhara, T. Kimura, N. Shibata, Y. Ikuhara. “Li-ion conductivity of lithium lanthanum niobate polycrystals” 22nd International Conference on Solid State Ionics, PyeongChang, Korea, June 2019.
    6. K. Kawahara, T. Higashi, K. Nakayama, R. Ishikawa T. Kimura, Y. H. Ikuhara, N. Shibata, Y. Ikuhara, “Ionic conductivity of lithium lanthanum niobate polycrystals: Electrochemical impedance spectroscopy analysis” International meeting on lithium batteries 2018, Kyoto, Japan, June 19th 2018.
    7. K. Kawahara, “Structure of silicene grown on Ag(111)” 8th HOPE MEETING with Nobel Laureates, Tsukuba, Japan, March 8th 2016.
    8. K. Kawahara, R. Arafune, M. Kawai, N. Takagi,“Application of algebraic number theory to 2-dimensional lattice matching” 10th International Symposium on Atomic Level Characterizations for New Materials and Devices ’15, Matsue, Japan, October 28th 2015.
    9. K. Kawahara, T. Shirasawa, R. Arafune, C.-L. Lin, T. Takahashi, M. Kawai, N. Takagi, “Structure determination of silicene on Ag(111) by low-energy electron diffraction’’ 11th International Conference on the Structure of Surfaces, Warwick University, Coventry, UK, July 21th 2014.
    10. K. Kawahara, T. Shirasawa, R. Arafune, C.-L. Lin, T. Takahashi, M. Kawai, N. Takagi, “Structure Determination of Silicene on Ag(111) by Low Energy Electron Diffraction’’ Symposium on Surface and Nano Science 2014, Hokkaido, Japan, January 2014.

      11. 他5件

    Domestic Conference

    1. 川原一晃、石川亮、柴田直哉、幾原雄一. “Total variation 正則化を用いた原子分解能 STEM 像のノイズ除去” 日本顕微鏡学会第78回学術講演会 (ビッグパレットふくしま) 2022年5月
    2. 川原一晃、石川亮、柴田直哉、幾原雄一. “Rb添加KSbF4(K1-xRbxSbF4)のフッ化物イオン伝導” 第62回電池討論会 (オンライン) 2021年11月
    3. 川原一晃、石川亮、仲山啓、柴田直哉、幾原雄一. “KSbF4のフッ化物イオン伝導” 日本セラミックス協会2021年会 (オンライン) 2021年3月
    4. 川原一晃、石川亮、仲山啓、柴田直哉、幾原雄一. “フルオロアンチモン酸カリウム(KSbxF1+3x)のフッ化物イオン伝導” 第61回電池討論会 (オンライン) 2020年11月
    5. (招待講演) 川原一晃、井上和俊、斎藤光浩、荒船竜一、林俊良、高木紀明、川合眞紀、幾原雄一. “界面接合の実験と数理” IMI workshop II: 材料科学における幾何と代数I (オンライン) 2020年9月
    6. 川原一晃、石川亮、仲山啓、東拓磨、木村禎一、幾原裕美、柴田直哉、幾原雄一、“(La,Li)NbO3固体電解質のイオン伝導と局所構造” 第59回電池討論会 (大阪府立国際会議場) 2018年11月29日
    7. 川原一晃、石川亮、仲山啓、東拓磨、木村禎一、幾原裕美、柴田直哉、幾原雄一、“(Li,La)NbO3多結晶体の局所構造とイオン伝導” 日本セラミックス協会 第31回秋季シンポジウム (名古屋工業大学) 2018年9月6日
    8. (推薦講演) 川原一晃、Zeyuan Ni、荒船竜一、白澤徹郎、林俊良、南谷英美、渡邉聡、川合眞紀、高木紀明、“低速電子回折を用いたWTe2表面の構造解析” 日本表面科学会北海道東北関東支部合同セミナー(東京大学) 2017年11月11日
    9. 川原一晃、荒船竜一、白澤徹郎、林俊良、Zeyuan Ni、南谷英美、渡邉聡、川合眞紀、高木紀明、“Structure Determination of Tungsten Telluride Surface” 表面界面スペクトロスコピー2016(仙台、秋保温泉)2016年11月26日
    10. 川原一晃、荒船竜一、川合眞紀、高木紀明“代数的整数論を応用した2次元格子整合理論”日本物理学会2016年秋季大会 (金沢大学) 2016年9月13日

      11. 他26件

    Awards

    1. 結晶界面工学研究会優秀発表賞, 結晶界面工学研究会(2017年9月3日).
    2. JSPS HOPE fellow (2016年3月11日).
    3. 表面界面スペクトロスコピー2014 Student Prize, 表面界面スペクトロスコピー2014(2014年12月6日).
    4. 新領域創成科学研究科長賞, 東京大学大学院新領域創成科学研究科(2014年3月).
    5. 修士論文優秀賞, 東京大学大学院新領域創成科学研究科物質系専攻(2014年3月).


    その他

    1. 東京大学フューチャーファカルティプログラム(東大FFP) (第7期302号, July, 2015).