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  2. Hiroki Wadati

Hiroki Wadati

  (和達 大樹)

Profile Information

Affiliation
Professor, Graduate School of Science, University of Hyogo
Degree
PhD(Mar, 2007, University of Tokyo)
Researcher number
00579972
ORCID ID
 https://orcid.org/0000-0001-5969-8624
J-GLOBAL ID
200901069788709054
researchmap Member ID
5000090682
External link

Research Interests

 2

Research Areas

 1

Research History

 6
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Education

 1

Committee Memberships

 10
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Awards

 8
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Papers

 224
  • Goro Shibata, Keisuke Ikeda, Takeshi Seki, Shoya Sakamoto, Yosuke Nonaka, Zhendong Chi, Yuxuan Wan, Masahiro Suzuki, Tsuneharu Koide, Hiroki Wadati, Koki Takanashi, Atsushi Fujimori
    Applied Physics Letters, Oct 6, 2025  
  • Kou Takubo, Kohei Yamamoto, Kota Murota, Naoki Moritsuna, Kohei Yamagami, Yasuyuki Hirata, Hiroki Wadati, Ronny Sutarto, Kazuki Hashizume, Satoshi Imaizumi, Takuya Aoyama, Yoshinori Imai, Kenya Ohgushi, Takashi Mizokawa
    Journal of the Physical Society of Japan, Sep 15, 2025  
  • Hiroya Ohtsuki, Suguru Nakata, Yu Yamane, Ryunosuke Takahashi, Koichi Kusakabe, Hiroki Wadati
    Zeitschrift für anorganische und allgemeine Chemie, Jun 24, 2025  
    <jats:p>The crystal structure of La4Ge3S12 has been known to be noncentrosymmetric for almost four decades. This characteristic inversion symmetry breaking suggests the presence of nonlinear optical (NLO) properties. Yet, experimental observations of such phenomena, including second harmonic generation (SHG) have been reported only in recent studies. In this study, we synthesized La4Ge3S12 using the one‐step melting method, which is more straightforward than the conventional two‐step growth method. We characterized the composition, crystal structure, and electronic structure using electron probe microanalysis, powder X‐ray diffraction, and X‐ray photoelectron spectroscopy. The experimental electronic structure is in line with those obtained using first‐principle calculations. In addition, we observed the NLO properties of La4Ge3S12 in response to the ultrashort pulsed infrared laser. We found that the intensity of the SHG quadratically depends on the intensity of the incident light, mirroring the intrinsic nature of NLO.</jats:p>
  • Takahashi, Ryunosuke, Guen, Yann Le, Nakata, Suguru, Igarashi, Junta, Hohlfeld, Julius, Malinowski, Grégory, Xie, Lingling, Kan, Daisuke, Shimakawa, Yuichi, Mangin, Stéphane, Wadati, Hiroki
    Applied Physics Letters, 126(21) 212405-212405, May, 2025  
  • S. Nakata, M. Bejas, J. Okamoto, K. Yamamoto, D. Shiga, R. Takahashi, H. Y. Huang, H. Kumigashira, H. Wadati, J. Miyawaki, S. Ishida, H. Eisaki, A. Fujimori, A. Greco, H. Yamase, D. J. Huang, H. Suzuki
    Phys. Rev. B, 111 165141, Apr 21, 2025  Peer-reviewed
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Misc.

 173
  • 中田勝, 岡本淳, 志賀大亮, 高橋龍之介, HUANG H. Y., SINGH A., 組頭広志, 和達大樹, 石田茂之, 永崎洋, 藤森淳, 藤森淳, 藤森淳, HUANG D. J., HUANG D. J., 鈴木博人
    日本物理学会講演概要集(CD-ROM), 78(2), 2023  
  • 中田勝, 岡本淳, 志賀大亮, 高橋龍之介, HUANG H. Y., SINGH A., 組頭広志, 和達大樹, 石田茂之, 永崎洋, 藤森淳, 藤森淳, 藤森淳, HUANG D. J., HUANG D. J., 鈴木博人
    日本物理学会講演概要集(CD-ROM), 78(2), 2023  
  • 鎌田知希, 森野喬, 下元直樹, 谷佳樹, 高橋龍之介, 和達大樹, 小阪田泰子, 藤塚守, 田原圭志朗, 小澤芳樹, 阿部正明
    錯体化学会討論会講演要旨集, 73rd, 2023  
  • Kou Takubo, Huiyuan Man, Satoru Nakatsuji, Kohei Yamamoto, Yujun Zhang, Yasuyuki Hirata, Hiroki Wadati, Akira Yasui, Takashi Mizokawa, Daniel I. Khomskii
    Physical Review Materials, 5(7), Jul 19, 2021  
    Both the Jahn-Teller distortion of Cu$^{2+}$O$_6$ octahedra and magnetic ordering are absent in hexagonal Ba$_3$CuSb$_2$O$_9$ suggesting a Cu 3$d$ spin-orbital liquid state. Here, by means of resonant x-ray scattering and absorption experiment, we show that oxygen 2$p$ holes play crucial role in stabilizing this spin-orbital liquid state. These oxygen holes appear due to the "reaction" Sb$^{5+}$$\rightarrow$Sb$^{3+}$ $+$ two oxygen holes, with these holes being able to attach to Cu ions. The hexagonal phase with oxygen 2$p$ holes exhibits also a novel charge-orbital dynamics which is absent in the orthorhombic phase of Ba$_3$CuSb$_2$O$_9$ with Jahn-Teller distortion and Cu 3$d$ orbital order. The present work opens up a new avenue towards spin-charge-orbital entangled liquid state in transition-metal oxides with small or negative charge transfer energy.
  • Hiroshi Fukui, Hirokazu Kadobayashi, Hirotaka Abe, Ryunosuke Takahashi, Hiroki Wadati, Naohisa Hirao
    Apr 22, 2021  
    We have measured the lattice volume of ice VIII in different pressure-temperature pathways and found isothermal compression at low-temperature conditions makes the volume larger. Ice VIII has become its high-pressure phase with the molar volume of 6.45 cm^3 at 10 K where the pressure can be estimated as 60.4 GPa based on the third-order Birch-Murnaghan equation with parameters determined in this study (K_0= 32.4 GPa, K'_0= 3.7, and V_0= 11.9 cm^3). The present results indicate that this high-pressure state is paraelectric with tetragonal symmetry.
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Presentations

 58
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Teaching Experience

 14
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Professional Memberships

 5

Research Projects

 32

Media Coverage

 13
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