Photocarrier doping to transition metal oxides

2008 Fiscal Year Final Research Report

• Project/Area Number: 16076208
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: HIROI Zenji The University of Tokyo, 物性研究所, 教授 (30192719)
• Co-Investigator(Kenkyū-buntansha): FUJIMORI Atsushi 東京大学, 大学院・理学系研究科, 教授 (10209108)
• Project Period (FY): 2004 – 2008
• Keywords: 強相関電子系 / 光物性 / 薄膜 / 光電子分光 / 光ドーピング

Research Abstract

様々な遷移金属酸化物を対象として、高品質の薄膜作製を行い、紫外線を照射することによって光キャリアドーピングを行い、それに伴う物性の変化を輸送特性の評価および光電子分光実験を通して詳しく調べた。その結果、光キャリアドーピングに伴うキャリアの導入と電気抵抗の大きな変化、および、ケミカルポテンシャルの可逆シフトを観測した。また、透明半導体である二酸化スズ薄膜において、顕著な光照射効果を発見し、その機構を明らかにした。さらに、銅酸化物超伝導体やマンガンペロブスカイト酸化物において光電子分光実験により、光キャリアドーピングの効果と電子状態の変化に関する重要な知見が得られた。

Research Products

• [Journal Article] Photo-induced conductivity in tin dioxide thin films (2009)
  • Author(s): Y. Muraoka, N. Takubo, Z. Hiroi
  • Journal Title: J. Appl. Phys. 105 Pages: 103702
  • Peer Reviewed
• [Journal Article] Conductivity switching by ultraviolet light in SnO_2 thin films (2009)
  • Author(s): N. Takubo, Y. Muraoka, Z. Hiroi
  • Journal Title: Appl. Phys. Express 2 Pages: 045501
  • Peer Reviewed
• [Journal Article] Minimal model needed for the Mott-Hubbard SrVO_3 compound, Physical Review B (2009)
  • Author(s): R. J. O. Mossanek, M. Abbate, T. Yoshida, A. Fujimori, Y. Yoshida, N. Shirakawa, H. Eisaki, S. Kohno, P. T. Fonseca, F. C. Vicentin
  • Journal Title: Condensed Matter and Materials Physics 79 Pages: 033104
  • Peer Reviewed
• [Journal Article] Evolution of the spectral weight in the Mott-Hubbard series SrVO_3-CaVO_3-LaVO_3-YVO_3 (2008)
  • Author(s): R. J. O. Mossanek, M. Abbate, T. Yoshida, A. Fujimori, Y. Yoshida, N. Shirakawa, H. Eisaki, S. Kohno, F. C. Vicentin
  • Journal Title: Phys. Rev. B 78 Pages: 075103-075107
  • Peer Reviewed
• [Journal Article] Chemical potential landscape in band filling and bandwidth-control of manganites : Potoemission spectroscopy measurements (2008)
  • Author(s): K. Ebata, M. Takizawa, A. Fujimori, H. Kuwahara, Y. Tomioka, Y. Tokura
  • Journal Title: Phys. Rev. B 78 Pages: 020406
  • Peer Reviewed
• [Journal Article] Optical switching in VO_2 films by below-gap excitation (2008)
  • Author(s): M. Rini, Z. Hao, R. W. Schoenlein, C. Giannetti, F. Parmigiani, S. Fourmaux, J. C. Kieffer, A. Fujimori, M. Onoda, S. Wall, A. Cavalleri
  • Journal Title: Appl. Phys. Lett. 92 Pages: 181904
  • Peer Reviewed
• [Journal Article] Photoinduced metallic state in VO_2 proved by the terahertz pump-probe spectroscopy (2008)
  • Author(s): M. Nakajima, N. Takubo, Z. Hiroi, Y. Ueda, T. Suemoto
  • Journal Title: Appl. Phys. Lett. 92 Pages: 011907
  • Peer Reviewed
• [Journal Article] Temperature-dependent photoemission spectra, spectral-weight transfer and chemical-potential shift in Pr_<1-x>Ca_xMnO_3 : Implications for charge-density modulation (2007)
  • Author(s): K. Ebata, M. Hashimoto, K. Tanaka, A. Fujimori, Y. Tomioka, Y. Tokura
  • Journal Title: Phys. Rev. B 76 Pages: 184441
  • Peer Reviewed
• [Journal Article] Photoemission study of TiO_2/VO_2 interfaces (2007)
  • Author(s): K. Maekawa, M. Takizawa, H. Wadati, T. Yoshida, A. Fujimori, H. Kumigashira, M. Oshima, Y. Muraoka, Y. Nagao, Z. Hiroi
  • Journal Title: Phys. Rev. B 76 Pages: 115121
  • Peer Reviewed
• [Journal Article] Distinct Doping Dependences of the Pseudogap and Superconducting Gap of La_<2-x>Sr_xCuO_4 Cuprate Superconductors (2007)
  • Author(s): M. Hashimoto, T. Yoshida, K. Tanaka, A. Fujimori, M. Okusawa, S.Wakimoto, K. Yamada, T. Kakeshita, H. Eisaki, S. Uchida
  • Journal Title: Phys. Rev. B 75 Pages: 140503
  • Peer Reviewed
• [Journal Article] Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212 (2006)
  • Author(s): K. Tanaka, T. Yoshida, K. M. Shen, D. H. Lu, W. S. Lee, H. Yagi, A. Fujimori, Z. -X. Shen, Risdiana, T. Fujii, I. Terasaki
  • Journal Title: Science 314 Pages: 1910
  • Peer Reviewed
• [Journal Article] Photoemission from Buried Interfaces in SrTiO_3/LaTiO_3 Superlattices (2006)
  • Author(s): M. Takizawa, H. Wadati, K. Tanaka, M. Hashimoto, T. Yoshida, A. Fujimori, A. Chikamatsu, H. Kumigashira, M. Oshima, K. Shibuya, T. Mihara, T. Ohnishi, M. Lippmaa, M. Kawasaki, H. Koinuma, S. Okamoto, A. J. Millis
  • Journal Title: Phys. Rev. Lett. 97 Pages: 57601
  • Peer Reviewed
• [Journal Article] Photogenerated carrier injection to an n-type copper oxide superconductor (2005)
  • Author(s): Y. Muraoka, T. Muramatsu, Z. Hiroi
  • Journal Title: Thin Solid Films 486 Pages: 82
  • Peer Reviewed
• [Journal Article] Photocarrier Injection and Current-Voltage Characteristics of a La_<0.8>Sr_<0.2>MnO_3/SrTiO_3 : Nb Heterojunction at Low Temperature (2005)
  • Author(s): T. Muramatsu, Y. Muraoka, Z. Hiroi
  • Journal Title: Jpn. J. Appl. Phys. 152 Pages: 385
  • Peer Reviewed
• [Journal Article] Manifestation of Correlation Effects in the Photoemission Spectra of Ca_<1-x>Sr_xRuO_3 (2005)
  • Author(s): M. Takizawa, D. Toyota, H. Wadati, A. Chikamatsu, H.Kumigashira, A. Fujimori, M. Oshima, Z. Fang, M. Lippmaa, M. Kawasaki, H. Koinuma
  • Journal Title: Phys. Rev. B 72 Pages: 060404
  • Peer Reviewed
• [Journal Article] Direct Observation of the Mass Renormalization in SrVO_3 by Angle-Resolved Photemission Spectroscopy (2005)
  • Author(s): T. Yoshida, K. Tanka, H. Yagi, A. Ino, H. Eisaki, A. Fujimori, Z. -X Shen
  • Journal Title: Phys. Rev. Lett. 95 Pages: 146404
  • Peer Reviewed
• [Journal Article] Photocarrier injection to perovskite manganites (2004)
  • Author(s): T. Muramatsu, Y. Muraoka, T. Yamauchi, J. Yamaura, Z. Hiroi
  • Journal Title: J. Mag. Mag. Mat. Pages: 272-276, E297-E298
  • Peer Reviewed
• [Journal Article] Photoemission Study of YBa_2Cu_3O_y Thin Films under Light Illumination (2004)
  • Author(s): D. Asakura, J.W. Quilty, K. Takubo, S. Hirata, T. Mizokawa, Y. Muraoka, Z. Hiroi
  • Journal Title: Phys. Rev. Lett. 93 Pages: 247006
  • Peer Reviewed
• [Journal Article] Photoemission study of the metal-insulator transition in VO_2/TiO_2 (001) : Evidence for strong electron-electron and electron-phonon interaction (2004)
  • Author(s): K. Okazaki, H. Wadati, A. Fujimori, M. Onoda, Y. Muraoka, Z. Hiroi
  • Journal Title: Phys. Rev. B 69 Pages: 165104
  • Peer Reviewed
• [Journal Article] The Dichotomy between Nodal and Antinodal Quasiparticles in Underdoped La_<2-x>Sr_xCuO_4 Superconductors (2004)
  • Author(s): X. J. Zhou, T. Yoshida, D. -H. Lee, W. L. Yang, V. Brouet, F. Zhou, W. X. Ti, J. W. Xiong, Z. X. Zhao, T. Sasagawa, T. Kakeshita, H. Eisaki, S. Uchida, A. Fujimori, Z. Hussain, Z. -X. Shen
  • Journal Title: Phys. Rev. Lett. 92 Pages: 187001
  • Peer Reviewed
• [Presentation] 周期的ステップ構造基板上に作製したYBa_2Cu_3O_<7-δ>極薄膜の超伝導状態と磁束状態 (2009)
  • Author(s): 鶴巻厚, 廣井善二
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] Effect of UV light irradiation in SnO_2 thin films (2008)
  • Author(s): Naoko Takubo, Yuji Muraoka, Zenji Hiroi
  • Organizer: 3rd INTERNATIONAL CONFERENCE ON PHOTO-INDUCED PHASE TRANSITIONS and Cooperative Phenomena (PIPT2008)
  • Place of Presentation: 大阪市立大学
  • Year and Date: 20081111-15
• [Presentation] YBa_2Cu_3O_<7-δ>の極薄膜化と超伝導特性 (2008)
  • Author(s): 鶴巻厚, 廣井善二
  • Organizer: 物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] SnO_2薄膜における紫外線照射効果 (2007)
  • Author(s): 田久保直子, 村岡祐治, 広井善二
  • Organizer: 日本物理学会2007年秋季大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-23
• [Presentation] Pr_<1-x>Ca_xMnO_3の化学ポテンシャルのドーピングおよび温度依存性 (2007)
  • Author(s): 江端一晃, 滝沢優, 藤森淳, 富岡泰秀, 十倉好紀
  • Organizer: 2007年秋季大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-23
• [Presentation] SnO_2薄膜における光キャリア注入 (2007)
  • Author(s): 田久保直子, 村岡祐治, 廣井善二
  • Organizer: 日本物理学会2007春季大会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2007-03-18
• [Presentation] YBa_2Cu_3O_<7-δ>薄膜における界面構造に影響された伝導特性 (2006)
  • Author(s): 鶴巻厚, 竹下直, 村岡祐治, 広井善二, 高木英典, 十倉好紀
  • Organizer: 日本物理学会2006秋季大会
  • Place of Presentation: 千葉大学
  • Year and Date: 2006-09-23
• [Presentation] TiO_2でキャップしたVO_2薄膜の光電子分光 (2006)
  • Author(s): 前川考志, 滝沢優, 和達大樹, 藤森淳, 組頭広志, 尾嶋正治, 長尾洋平, 村岡祐治, 廣井善二
  • Organizer: 日本物理学会第61回年次大会
  • Place of Presentation: 愛媛・松山大学
  • Year and Date: 2006-03-27
• [Presentation] YBa_2Cu_3O_<7-x>極薄膜への光キャリア注入 (2005)
  • Author(s): 村岡祐治, 村松孝樹, 広井善二
  • Organizer: 日本物理学会第60回年次大会
  • Place of Presentation: 東京理科大学
  • Year and Date: 2005-03-14
• [Presentation] (Sr, Nd)CuO_2薄膜への光キャリア注入 (2004)
  • Author(s): 村岡祐治, 村松孝樹, 広井善二
  • Organizer: 日本物理学会2004年秋季大会
  • Place of Presentation: 秋田大学
  • Year and Date: 2004-09-11
• [Presentation] 酸化物界面における光電荷注入による物性制御 (2004)
  • Author(s): 広井善二
  • Organizer: 日本物理学会2004年秋季大会
  • Place of Presentation: 秋田大学
  • Year and Date: 2004-09-11
• [Remarks]
  • URL: http://hiroi.issp.u-tokyo.ac.jp/
• [Remarks]
  • URL: http://wyvern.phys.s.u-tokyo.ac.jp/