論文

• Jingcheng Qi, Shiyao WangShiyao Wang, Shiyao Wang, Junjie Wang, Naoto Umezawa, Vladislav A. Blatov, Hideo Hosono. B₅N₃ and B7N5 Monolayers with High Carrier Mobility and Excellent Optical Performance, J. Phys. Chem. Lett., 12, 4823-4832, May 2021.
• Kun Li, Junjie Wang, Vladislav A. Blatov, Yutong Gong, Naoto Umezawa, Tomofumi Tada, Hideo Hosono, Artem R. Oganov. Crystal and electronic structure engineering of tin monoxide by external pressure, J Adv Ceram., 10, 565–577, 2021.
• Satoshi Koyasu, Naoto Umezawa, Akira Yamaguchi, Masahiro Miyauchi. Optical properties of single crystalline copper iodide with native defects: Experimental and density functional theoretical investigation, J. Appl. Phys., Vol. 125, Mar. 2019.
• Satoshi Koyasu, Naoto Umezawa, John Baniecki, Akira Yamaguchi, Masahiro Miyauchi. Growth of large single crystals of copper iodide by a temperature difference method using feed crystal under ambient pressure, Cryst. Growth Des., Vol. 18, pp. 6748-6756, Dec. 2018.
• Toshiki Yoshida, Akira Yamaguchi, Naoto Umezawa, Masahiro Miyauchi. Photocatalytic CO2 reduction using pristine Cu2ZnSnS4 film electrode under visible light irradiation, J. Phys. Chem. C, Vol. 122, pp. 21695-21702, Oct. 2018.
• Junjie Wang, Kota Hanzawa, Hidenori Hiramatsu, Junghwan Kim, Naoto Umezawa, Koki Iwanaka, Tomofumi Tada, Hideo Hosono. Exploration of Stable Strontium Phosphide-Based Electrides: Theoretical Structure Prediction and Experimental Validation, Journal of the American Chemical Society, American Chemical Society, Vol. 139, No. 44, pp. 15668–15680, Oct. 2017.
• H. Nishino, T. Fujita, N. T. Cuong, S. Tominaka, M. Miyauchi, S. Iimura, A. Hirata, N. Umezawa, S. Okada, E. Nishibori, A. Fujino, T. Fujimori, S. Ito, J. Nakamura, H. Hosono, T. Kondo. Formation and characterization of hydrogen boride sheets derived from MgB2 by cation exchange, J. Am. Chem. Soc., Vol. 139, pp. 13761-13769, Sept. 2017.
• K. Yoshimatsu, Hisanori Mashiko, Naoto Umezawa, Koji Horiba, Hiroshi Kumigashira, A. Ohtomo. Electronic structures and photoanodic properties of ilmenite-type MTiO₃ epitaxial films (M = Mn, Fe, Co, Ni), The Journal of Physical Chemistry C, American Chemical Society, Vol. 121, pp. 18717-18724, Aug. 2017.  公式リンク  
  
• Junjie Wang, Mohammad Khazaei, Masao Arai, Naoto Umezawa, Tomofumi Tada, Hideo Hosono. Semimetallic Two-Dimensional TiB12: Improved Stability and Electronic Properties Tunable by Biaxial Strain, Chemistry of Materials, American Chemical Society, Vol. 29, No. 14, pp. 5922-5930, July 2017.  公式リンク  
  
• Y. Shiga, N. Umezawa, N. Srinivasan, S. Koyasu, E. Sakai, M. Miyauchi. Metal sulfide photocatalyst composed of ubiquitous elements for solar hydrogen production, Chem. Commun., Vol. 52, p. 7470, May 2016.
• Kentaro Doi, Yutaka Mikazuki, Shinya Sugino, Tatsuki Doi, Pawel Szarek, Masato Senami, Kenji Shiraishi, HIROSHI IWAI, Naoto Umezawa, 知京豊裕, Keisaku Yamada, Akitomo Tachibana. Electronic structure study of local dielectric properties of lanthanoid oxide, clusters, JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 47, pp. 205-211, Jan. 2008.
• N. Umezawa, S. Saito. Excitation Spectra in the Time-Dependent Density-Functional Theory with Gradient Correction, Computational Approaches to Predicting Optical Properties of Materials, edited by J. R. Chelikowsky et al., Materials Research Society Symposium Proceedings, Vol. 579, pp. 75-80, 1999.

国際会議発表 (査読有り)

• Chun Ouyang, Yousoo Kim, Kohei Hashimoto, Hayato Tsuji, Eiichi Nakamura, Naoto Umezawa, Yutaka Majima. Electron Transport Mechanisms for a Rigid Carbon-bridged Oligo(phenylenevinylene)s between Electroless Au-plated Nanogap Electrodes, KJF International Conference on Organic Materials for Electronics and Photonics 2016 (KJF-ICOMEP), Sept. 2016.
• Miyuki Kouda, Kuniyuki KAKUSHIMA, Naoto Umezawa, Ahmet Parhat, Kenji Shiraishi, Toyohiro Chikyow, Keisaku Yamada, HIROSHI IWAI. Charged defects reduction in gate insulator with multivalent materials, 2009 Symposium on VLSI Technology, 2009 Symposium on VLSI Technology Digest of Technical Papers, VLSI Technology, pp. 200-201, June 2009.

国内会議発表 (査読有り)

• Yuta Aoki, Naoto Umezawa, Susumu Saito. Synthesis conditions and electronic structures of heavily N-doped TiO2, American Physical Society 2014 March Meeting, Mar. 2014.

国際会議発表 (査読なし・不明)

• Toshiki Yoshida, Naoto Umezawa, Akira Yamaguchi, ETSUO SAKAI, Masahiro Miyauchi. CO2 Reduction by Cu2ZnSnS4 Photocathode, The Tenth International Conference on the Science and Technology for Advanced Ceramics, Aug. 2017.
• Satoshi Koyasu, Naoto Umezawa, Akira Yamaguchi, Masahiro Miyauchi. Optical Property of Copper Iodide with Defects, 29th International Conference on Defects in Semiconductors, Aug. 2017.
• Naoto Umezawa, Kenji Shiraishi, Kuniyuki KAKUSHIMA, Kenji Ohmori, Keisaku Yamada, 知京豊裕, HIROSHI IWAI. Relation between solubility of silicon in high-k oxides and the effect of Fermi level pinning, ECS 213th Meeting, May 2008.

国内会議発表 (査読なし・不明)

• 小安智士, 梅澤直人, 山口晃, 宮内雅浩. ヨウ化銅中における点欠陥の光学特性の調査, 応用物理学会秋季学術講演会, Sept. 2019.
• 小安智士, バニッキー ジョン, 梅澤直人, 山口晃, 宮内雅浩. ヨウ化銅バルク単結晶の育成と物性評価, 第79回 応用物理学会秋季学術講演会, Sept. 2018.
• Miyuki Kouda, Naoto Umezawa, Kuniyuki KAKUSHIMA, Hiroshi Nohira, Ahmet Parhat, Kenji Shiraishi, 知京豊裕, Keisaku Yamada, HIROSHI IWAI. Charged defects reduction in gate insulator with multivalent materials, G-COE PICE International Symposium on Silicon Nano Devices, Oct. 2009.
• 幸田みゆき, 梅澤直人, 角嶋邦之, パールハットアヘメト, 白石賢二, 知京豊裕, 山田啓作, 岩井洋, 服部健雄. 低電子揺動Ce酸化物を利用したhigh－k膜中の固定電荷の抑制, 応用物理学会 薄膜･表面物理分科会/シリコンテクノロジー分科会共催特別研究会 ゲートスタック研究会－材料･プロセス・評価の物理－（第14回研究会）, ゲートスタック研究会－材料･プロセス・評価の物理－（第14回研究会）, ゲートスタック研究会, pp. 21, Jan. 2009.

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