2002 Fiscal Year Annual Research Report

強相関低次元系における巨大非線形光学応答の研究

Research Project

Project/Area Number	13440090
Research Institution	The University of Tokyo
Principal Investigator	岡本博東京大学, 大学院・新領域創成科学研究所, 助教授 (40201991)
Keywords	非線形光学効果 / 三次の非線形感受率 / 強相関係 / 銅酸化物
Research Abstract	本研究では、典型的な強相関一次元系である銅酸化物(Sr_2CuO_3、Ca_2CuO_3等)およびハロゲン架橋ニッケル錯体、また二次元銅酸化物(La_2CuO_4、Nd_2CuO_4等)において、光の周波数領域での三次の非線形光学応答を評価し、χ^<(3)>が増大する機構を解明することを目的としている。本年度は、まず第一に、ハロゲン架橋ニッケル錯体において第三高調波発生の測定を行った。第三高調波発生の測定は通常透過型の配置で行われる。その測定のためには、良質な薄膜試料が必要であるが、ハロゲン架橋ニッケル錯体では、薄膜試料の作成が困難である。そこで、単結晶試料にも適用できる反射型の第三高調波発生の測定系を構築し、三次の非線形感受率χ^<(3)>スペクトルの定量的評価を試みた。その結果、塩素架橋のニッケル錯体では、χ^<(3)>の最大値は10^<-9>esuのオーダーであり極めて大きいことがわかった。そのスペクトル形状を詳細に解析したところ、縮退した奇と偶の電荷移動励起状態のわずかに高エネルギー側にエネルギー幅の広い奇の励起状態を仮定すると得られたχ^<(3)>スペクトルをよく再現できることがわかった。この奇の励起状態は、連続状態(バンド間遷移)に対応するものと考えられる。さらに、ハロゲン架橋ニッケル錯体において、ポンプープローブ法による二光子吸収の測定を行い、偶の電荷移動励起状態のエネルギー位置と線幅を求めた。その結果は、第三高調波発生法によるχ^<(3)>スペクトルの解析から求められた偶の電荷移動励起状態のエネルギー位置や線幅とよく一致することがわかった。

Research Products

(14 results)

All Other

All Publications (14 results)

[Publications] W.Fujita, H.Okamoto, et al.: "Room-temperature magnetic bistability in organic radical crystals : Paramagnetic-diamagnetic phase transition in 1,3,5-trithia-2,4,6-triazapentalenyl"Physical Review B. 65. 064434-1-064434-9 (2002)
[Publications] M.Yamashita, H.Okamoto, et al.: "Tuning of Electronic Structures of Quasi-One-Dimensional Bromo-Bridged Ni(III) Complexes with Strong Electron-Correlation by Doping of Co(III) Ions, [Ni_<1-x>Cox(Chxn)_2Br]Br_2"Inorganic Chemistry. 41. 1998-2000 (2002)
[Publications] S.Fujimori, H.Okamoto, et al.: "Angle-Resolved Photoemission Study of the MX-chain compound [Ni(chxn)_2Br]Br_2 : Spin-Charge Separation in Hybridized d-p Chains"Physical Review Letters. 88. 247601-247604 (2002)
[Publications] S.Fujimori, H.Okamoto, et al.: "Photoemission study of quasi-one-dimensional halogen-bridged compound [Ni(chxn)_2Br]Br_2"Surface Review and Letters. 9. 1065-1069 (2002)
[Publications] K.Takizawa, H.Okamoto, et al.: "Crystal and electronic structures of quasi-one-dimensional halogen-bridged binuclear platinum complexes {(C_nH_<2n+1>)_2 NH_2 NH_2}_4[Pt_2(pop)_4I] (n=2-6)"Molecular Crystals and Liquid Crystals. 376. 159-164 (2002)
[Publications] T.Manabe, H.Okamoto, et al.: "Physical properties of quasi-one-dimensional Mixed-Metal and Mixed-Halogen Complexes, [Ni_<1-x>Pd_x(chxn)_2Cl_y Br_<1-y>]Y_2"Molecular Crystals and Liquid Crystals. 376. 165-170 (2002)
[Publications] T.Manabe, H.Okamoto, et al.: "Tuning of Spin Density Wave Strengths in Quasi-One-Dimensional Mixed-Halogen-Bridged Nickel(III) Complexes with Strong Electron Correlation,[Ni^<III>(chxn)_2Cl_<1-x>Br_x](NO_3)_2"Inorganic Chemistry. 41. 4993-4995 (2002)
[Publications] T.Ogasawara, H.Okamoto, et al.: "Photo-Induced Dynamics of Charge/Orbital Order in Perovskite Manganite Nd _<0.5>Ca_<0.5>MnO_3"Journal of Physical Society of Japan.,. 71. 2380-2383 (2002)
[Publications] K.Iwano, H.Okamoto, et al.: "Strong effective suppression of electron-lattice interaction in the photoexcited states of halogen-bridged Ni complexes as one-dimensional Mott insulators"Physical Review B. 66. 235103-1-235103-5 (2002)
[Publications] S.Iwai, H.Okamoto, et al.: "Ultrafast primary process of photoinduced N-I transition and macroscopic oscillation of domain boundary in TTF-CA"Phase transitions. 75. 807-813 (2002)
[Publications] H.Miyasaka, H.Okamoto, et al.: "Magnetic/Conducting Hybrid Compound Composed of 1-D Chain [Mn^<II>_2Cl_5(EtOH)]-_∞ and BEDT-TTF Stacking Layer"Journal of Solid State Chemistry. 168. 418-426 (2002)
[Publications] H.Okamoto, et al.: "Gigantic optical nonlinearity in one-dimensional Mott insulators"Nonlinear Optics. 29. 687-695 (2002)
[Publications] H.Matsuzaki, H.Okamoto, et al.: "Novel optical and magnetic bistability and photo-induced transition in a one-dimensional halogen-bridged binuclear Pt complex"Physical Review Letters. 90. 046401-1-046401-4 (2003)
[Publications] 岩井伸一郎, 岡本博, 十倉好紀: "光誘起協力現象の超高速ダイナミクス:擬一次元電荷移動錯体における中性-イオン性転移"表面科学. 23. 672-680 (2003)

2002 Fiscal Year Annual Research Report

強相関低次元系における巨大非線形光学応答の研究

Principal Investigator

岡本 博 東京大学, 大学院・新領域創成科学研究所, 助教授 (40201991)

Research Products

[Publications] W.Fujita, H.Okamoto, et al.: "Room-temperature magnetic bistability in organic radical crystals : Paramagnetic-diamagnetic phase transition in 1,3,5-trithia-2,4,6-triazapentalenyl"Physical Review B. 65. 064434-1-064434-9 (2002)

[Publications] M.Yamashita, H.Okamoto, et al.: "Tuning of Electronic Structures of Quasi-One-Dimensional Bromo-Bridged Ni(III) Complexes with Strong Electron-Correlation by Doping of Co(III) Ions, [Ni_<1-x>Cox(Chxn)_2Br]Br_2"Inorganic Chemistry. 41. 1998-2000 (2002)

[Publications] S.Fujimori, H.Okamoto, et al.: "Angle-Resolved Photoemission Study of the MX-chain compound [Ni(chxn)_2Br]Br_2 : Spin-Charge Separation in Hybridized d-p Chains"Physical Review Letters. 88. 247601-247604 (2002)

[Publications] S.Fujimori, H.Okamoto, et al.: "Photoemission study of quasi-one-dimensional halogen-bridged compound [Ni(chxn)_2Br]Br_2"Surface Review and Letters. 9. 1065-1069 (2002)

[Publications] K.Takizawa, H.Okamoto, et al.: "Crystal and electronic structures of quasi-one-dimensional halogen-bridged binuclear platinum complexes {(C_nH_<2n+1>)_2 NH_2 NH_2}_4[Pt_2(pop)_4I] (n=2-6)"Molecular Crystals and Liquid Crystals. 376. 159-164 (2002)

[Publications] T.Manabe, H.Okamoto, et al.: "Physical properties of quasi-one-dimensional Mixed-Metal and Mixed-Halogen Complexes, [Ni_<1-x>Pd_x(chxn)_2Cl_y Br_<1-y>]Y_2"Molecular Crystals and Liquid Crystals. 376. 165-170 (2002)

[Publications] T.Manabe, H.Okamoto, et al.: "Tuning of Spin Density Wave Strengths in Quasi-One-Dimensional Mixed-Halogen-Bridged Nickel(III) Complexes with Strong Electron Correlation,[Ni^<III>(chxn)_2Cl_<1-x>Br_x](NO_3)_2"Inorganic Chemistry. 41. 4993-4995 (2002)

[Publications] T.Ogasawara, H.Okamoto, et al.: "Photo-Induced Dynamics of Charge/Orbital Order in Perovskite Manganite Nd _<0.5>Ca_<0.5>MnO_3"Journal of Physical Society of Japan.,. 71. 2380-2383 (2002)

[Publications] K.Iwano, H.Okamoto, et al.: "Strong effective suppression of electron-lattice interaction in the photoexcited states of halogen-bridged Ni complexes as one-dimensional Mott insulators"Physical Review B. 66. 235103-1-235103-5 (2002)

[Publications] S.Iwai, H.Okamoto, et al.: "Ultrafast primary process of photoinduced N-I transition and macroscopic oscillation of domain boundary in TTF-CA"Phase transitions. 75. 807-813 (2002)

[Publications] H.Miyasaka, H.Okamoto, et al.: "Magnetic/Conducting Hybrid Compound Composed of 1-D Chain [Mn^<II>_2Cl_5(EtOH)]-_∞ and BEDT-TTF Stacking Layer"Journal of Solid State Chemistry. 168. 418-426 (2002)

[Publications] H.Okamoto, et al.: "Gigantic optical nonlinearity in one-dimensional Mott insulators"Nonlinear Optics. 29. 687-695 (2002)

[Publications] H.Matsuzaki, H.Okamoto, et al.: "Novel optical and magnetic bistability and photo-induced transition in a one-dimensional halogen-bridged binuclear Pt complex"Physical Review Letters. 90. 046401-1-046401-4 (2003)

[Publications] 岩井伸一郎, 岡本 博, 十倉好紀: "光誘起協力現象の超高速ダイナミクス:擬一次元電荷移動錯体における中性-イオン性転移"表面科学. 23. 672-680 (2003)

岡本博東京大学, 大学院・新領域創成科学研究所, 助教授 (40201991)

[Publications] 岩井伸一郎, 岡本博, 十倉好紀: "光誘起協力現象の超高速ダイナミクス:擬一次元電荷移動錯体における中性-イオン性転移"表面科学. 23. 672-680 (2003)