Control of the ferroelectric state in charge transfer complexes using THz wave

• Project/Area Number: 20540349
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: OKIMOTO Yoichi Tokyo Institute of Technology, 大学院・理工学研究科, 准教授 (50356705)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: テラヘルツ / フェムト秒レーザ / 強誘電体 / 電荷移動錯体 / 非線形光学

Research Abstract

In this research, we noticed TTF-CA crystal that shows ferroelectric transition and controlled the ferroelectric nature, constructing a system of THz spectroscopy. Using the THz system, we investigated temperature dependence of transmittance spectra in TTF-CA in the THz region and could probe variation of the THz signal after illuminating femtosecond laser pulses of 800 nm.

Research Products

• [Journal Article] Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor (EDO-TTF)_2PF_6 (2010)
  • Author(s): K.Onda, Y.Okimoto, et al.
  • Journal Title: Physica B-condensed matter Volume: 405
  • Peer Reviewed
• [Journal Article] Large and ultrafast photoinduced reflectivity change in the charge separated phase of Et_2Me_2Sb[Pd(1, 3-dithiol-2-thione-4, 5-dithiolate)_2]_2 (2009)
  • Author(s): T.Ishikawa, Y.Okimoto, et al.
  • Journal Title: Physical Review B 80 Pages: 115108-115115
  • Peer Reviewed
• [Journal Article] Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)_2PF_6 (2009)
  • Author(s): S.Ogihara, Y.Okimoto, et al.
  • Journal Title: Journal of Physics : Conference Series 148 Pages: 12008-12010
  • Peer Reviewed
• [Journal Article] Femtosecond time-resolved reflection spectroscopy in Pri_<1-x>Ca_xMnO_3(x=0.37) (2009)
  • Author(s): X. Peng, Y. Okimoto, M. S. Endo, K. Sato, T. Aizawa, Ken Onda, T. Ishikawa, S. Koshihara, T. Arima
  • Journal Title: Phys. Stat. Sol. (c) 6 Pages: 112-115
  • Peer Reviewed
• [Journal Article] 海外における超高速光誘起相転移研究の現状と観測装置 (2008)
  • Author(s): 板谷治郎, 沖本洋一, 腰原伸也
  • Journal Title: レーザー研究 36 Pages: 332-338
  • NAID: 10021105876
  • Peer Reviewed
• [Journal Article] (2002)
  • Author(s): S.Iwai, S.Tanaka, K.Fujinuma, H.Kishida, H.Okamoto, Y.Tokura
  • Journal Title: Phys.Rev.Lett. 88 Pages: 57402-57402
• [Journal Article] (2000)
  • Author(s): S.Horiuchi, Y.Okimoto, R.Kumai, Y.Tokura
  • Journal Title: J.Phys.Soc.Jpn. 69 Pages: 1302-1302
• [Journal Article] (1999)
  • Author(s): S.Koshihara, Y.Takahashi, H,Sakai, Y.Tokura, T.Luty
  • Journal Title: J.Phys.Chem.B 103 Pages: 2592-2592
• [Journal Article] (1981)
  • Author(s): J.B.Torrance, J.E.Vazquez, J.J.Mayerle, V.Y.Lee
  • Journal Title: Phys.Rev.Lett. 46 Pages: 253-253
• [Presentation] 有機電荷移動錯体TTF-CA結晶のテラヘルツ時間領域分光 (2011)
  • Author(s): 山口雄大、沖本洋一, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学五十嵐キャンパス
  • Year and Date: 2011-03-25
• [Presentation] Photoinduced Neutral-to-Tonic Transition of TTF-CA as Investigated by Picosecond Phonon Spectroscopy (2011)
  • Author(s): 山口雄大、沖本洋一, 他
  • Organizer: International School & Symposium on Multifunctional Molecule-based Materials
  • Place of Presentation: アルゴンヌ国立研究所
  • Year and Date: 2011-03-15
• [Presentation] Photoinduced Neutral-to-Ionic Transition of TTF-CA as Investigated by Picosecond Phonon Spectroscopy (2011)
  • Author(s): 吉田樹史、沖本洋一, 他
  • Organizer: International School & Symposium on Multifunctional Molecule-based Materials
  • Place of Presentation: アルゴンヌ国立研究所
  • Year and Date: 2011-03-15
• [Presentation] テラヘルツ時間領域分光によるTTF-CA結晶の中性-イオン性転移の観測 (2010)
  • Author(s): 山口雄大、沖本洋一, 他
  • Organizer: 第21回光物性研究会2010年12月10日
  • Place of Presentation: 大阪市立大学杉本キャンパス
  • Year and Date: 2010-12-10
• [Presentation] ピコ秒フォノン分光による有機電荷移動錯体TTF-CA単結晶の光誘起中性-イオン性相転移 (2010)
  • Author(s): 吉田樹史、沖本洋一, 他
  • Organizer: 第21同光物性研究会
  • Place of Presentation: 大阪市立大学杉本キャンパス
  • Year and Date: 2010-12-10
• [Presentation] テラヘルツ時間領域分光によるTTF-CA結晶の中性-イオン性転移の観測 (2010)
  • Author(s): 山口雄大、沖本洋一, 他
  • Organizer: 第21回光物性研究会
  • Place of Presentation: 大阪市立大学杉本キャンパス
  • Year and Date: 2010-12-10
• [Presentation] ピコ秒フォノン分光による有機電荷移動錯体TTF-CA単結晶の光誘起中性-イオン性相転移 (2010)
  • Author(s): 吉田樹史、沖本洋一, 他
  • Organizer: 第21回光物性研究会
  • Place of Presentation: 大阪市立大学杉本キャンパス
  • Year and Date: 2010-12-10
• [Presentation] 有機電荷移動錯体TTF-CA結品のテラヘルツ時間領域分光 (2010)
  • Author(s): 山口雄大、沖本洋一, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学五十嵐キャンパス
  • Year and Date: 2010-03-25
• [Presentation] フェムト秒時間分解フォノン分光による有機電荷移動錯体TTF-CA結晶の光誘起中性-イオン性相転移 (2010)
  • Author(s): 吉田樹史、沖本洋一, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学五十嵐キャンパス
  • Year and Date: 2010-03-25
• [Presentation] 電荷移動錯体TTF-CA結晶のテラヘルツ時間領域分光 (2010)
  • Author(s): 相澤岳、沖本洋一, 他
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-23
• [Presentation] 電荷移動錯体TTF- (2010)
  • Author(s): 相澤岳、沖本洋一, 他
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-23
• [Presentation] 電荷移動錯体TTF-CA結晶のテラヘルツ時間領域分光 (2009)
  • Author(s): 相澤岳、沖本洋一, 他
  • Organizer: 分子構造討論会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2009-09-23
• [Presentation] Photoinduced insulator-metal transition in Pr_<1/2>Ca_<1/2>CoO_3 as studied by femtosecond spectroscopy (2008)
  • Author(s): Y. Okimoto
  • 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: 2008-11-12