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1998 Fiscal Year Final Research Report Summary

Many-Body Effects and Photo-Induced Spatially Condensed Phases in the Exciton Systems in Layered Crystals

Research Project

Project/Area Number 09440121
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionOsaka City University

Principal Investigator

KARASAWA Tsutomu  Faculty of Science, Osaka City University, Professor, 理学部, 教授 (90106336)

Co-Investigator(Kenkyū-buntansha) AKAI Ichiro  Faculty of Science, Osaka City University, Lecturer, 理学部, 講師 (20212392)
KOMATSU Teruo  Faculty of Science, Osaka City University, Professor, 理学部, 教授 (90047134)
IIDA Takeshi  Faculty of Science, Osaka City University, Professor, 理学部, 教授 (80047191)
Project Period (FY) 1997 – 1998
Keywordslayered crystals / high density excitons / BiI_3 / coherent collective motion of excitons / Bose-Einstain condensation / nonlinear optical response / nonlinear Schrodinger equation / 非線形Schrodinger方程式
Research Abstract

We'v prepared good quality layered crystals BiI_3, GaSe, and PbI_2 for this project. In these crystals we have studied spatial behavior of the excitons at high density in connection with many-body effects and some new photo-induced condensed phases such as the Bose-Einstain condensation (BEC).
In BiI_3, exciton states called the stacking fault excitons (SFE) appear at a quasi two-dimensional planar defect of a stacking fault interface. The spatial behavior of SFE excited with a N_2-laser-pumped dye-laser was investigated by detecting space-resolved pump-and-probe and space-resolved photoluminescence spectra. From these spectra, there is confirmed the existence of the high density excitons moving collectively and coherently in the two-dimensional space. We examined these spectra in the picosecond time region with a mode-locked Nd : YAG laser system. It turns out that a component of the excitons expands rapidly with a velocity compared to the group velocity of the polariton mode. For this system as well as GaSe excitons, we also applied a new technique of the degenerate four-wave-mixing (DFWM) with spatially isolated two laser beams tuned at the resonant energies of the excitons. The DFWM signals was observed firstly at the middle point between the two exciting laser spots due to the propagation of the excitons. The observed extraordinary behavior of the SEE at high density is compared with the calculation based on the theory composed of a nonlinear Schrodinger equation, and the connection with the Bose-Einstain condensation of excitons is discused.

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] H.Mino,T.Kawai,I.Akai,T.Karasawa: "Spatial Propagation of Quasi Two-dimensional Excitons in a Layered Crystal BiI_3 under the High Density Excitation" J.Lumin.76&77. 109-112 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kondo,H.Mino,T.Karasawa: "Spatial Propagation of High Density Excitons Localized at a Stacking Disorder Plane in BiI_3" Physical Review B. 58. 13835-13846 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Suzuki,T.Iida: "Time-resolved Secondary Emission from the Three-level Electron-Phonon Coupled Systems 1:Numerical Study of Radiative and Nonradiative transitions" Physical Review B. 57. 370-378 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeyama,Y.G.Semenov,T.Karasawa: "An approach to the exciton magnetic polaron bifuration problem studied in Cd_<1-x>Mn_xTe-Cd-Te-Cd_<1-y>Mg_yTe asymmetric single quantum wells" J.Crystal Growth. 184/185. 907-911 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeyama,T.Karasawa: "Exciton magnetic Polaron Localization dynamics in bulk Cd_<1-x>Mn_xTe" J.Crystal Growth. 184/185. 917-920 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tsubota,T.Iida: "Superfluidity and voltex-lattice formation in quasi two-dimensional exciton system" J.Low Temperature Phys.113. 1165-1170 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Nitta,M.Suzuki,T.Iida: "Calculation of One-and two-photon abosrption spectraof crystalline C_<60>" Solid State Commun.109. 283-288 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mino,T.Kawai,I.Akai,T.Karasawa: "A Study of High Density Excitons and Their Spatial Correlation in a Two-dimensional Space of a Planar Defect in BiI_3" J.Electochemical Society.(発表予定). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeyama,T.Karasawa,G.Karc-zwski,T.Wojtowicz,J.Kossut: "On the Possibility of Real Exciton Free-Magnetic Polarons in Two-dimensional Diluted Maagnetic Semiconductors" Nonlinear Optics. 18. 199-206 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Karasawa,T.Kawai,H.Mino,I.Akai,T.Komatsu: "Coherent and Incoherent Transport Properties of Excitons at High Density in a Quasi Two-dimensional Space of a Stacking Disorder interface in a Layered Crystal BiI_3" J.Lumin.72-74. 876-878 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三野弘文,山本勝哉,河相武利,赤井一郎,唐沢力,小松晃雄: "層状結晶BiI_3結晶の二次元積層界面に励起された高密度励起子系のコヒーレント伝播の観測" 光物性研究会‘98論文集. 121-124 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山本勝哉,三野弘文,赤井一郎,唐沢力,小松晃雄,V.F.Aguekian: "層状結晶のGaSeの高密度光励起による光学応答" 光物性研究会‘98論文集. 113-116 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 新田仁,鈴木正人,飯田武: "強い電子格子相互作用系における正孔注入と多重安定構造" 光物性研究会‘98論文集. 315-318 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三野弘文,近藤久雄,河相武利,赤井一郎,唐沢力,小松晃雄: "層状結晶BiI_3結晶の二次元界面に高密度に生成された励起子の輸送機構の研究" 光物性研究会‘97論文集. 185-188 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑田直樹,飯田武: "半導体電子正孔系の高温での光学応答における多体効果" 光物性研究会‘97論文集. 189-192 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mino, T.Kawai, I.Akai T.Karasawa: "Spatial Propagation of Quasi Two-dimensional Excitons in a Layered Crystals BiI_3 under the High Density Excitation" J.Lumin.76&77. 109-112 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kondo, H.Mino, T.Karasawa: "Spatial Propagation of High Density Excitons Localized at a Stacking Disorder Plane in BiI_3" Physical Review B. 58. 13835-13846 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Suzuki, T.Iida: "Time-resolved Secondary Emission from the Three-level Electron-Phonon Coupled Systems 1 : Numerical Study of Radiative and Nonradiative transitions" Physical Review B. 57. 370-378 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeyama, Y.G.Semenov, T.Karasawa: "An approach to the exciton magnetic polaron bifuration problem studied in Cd_<1-x>MnxTe-Cd-Te-Cd_<1-v>Mg_vTe asymmetric single quantum wells" J.Crystal Growth. 184/185. 907-911 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeyama, T.Karasawa: "Exciton magnetic Polaron Localization dynamics in bulk Cd_<1-x>Mn_xTe" J.Crystal Growth. 184/185. 917-920 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tsubota, T.Iida: "Superfluidity and voltex-lattice formation in quasi two-dimensional exciton system" J.Low Temperature Phys.113. 1165-1170 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H,Nitta, M.Suzuki, T.Iida: "Calculation of One- and two-photon absorption spectra of crystalline C_<60>" Solid State Commun.109. 283-288 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mino, T.Kawai, I.Akai, T.Karasawa: "A Study of High Density Excitons and Their Spatial Correlation in a Two-dimensional Space of a Planar Defect in BiI_3" J.Electrochemical Society.(to be published).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeyama, T.Karasawa, G.Karc-zwski, T.Wojtowicz, J.Kossut: "On the Possibility of Real Exciton Free-Magnetic Polarons in Two-dimensional Diluted Magnetic Semiconductors" Nonlinear Optics. 18. 199-206 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Karasawa, T.Kawai, H.Mino, I.Akai, T.Komatsu: "Coherent and Incoherent Transport Properties of Excitons at High Density in a Quasi Two-dimensional Space of a Stacking Disorder interface in a Layered Crystal BiI_3" J.Lumin.72-74. 876-878 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mino, H.Kondo, T.Kawai, I.Akai, T.Komatsu: "Transport Mechanism of High Density Excitons Localized in a Quasi Two-dimensional Space of a Stacking Disorder Interface in a Layered Crystal BiI_3" Proceedings of the Symposium on Condensed Matter Photophysics '97. 185-188 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Kuwata, T.Iida: "Many-body Effects on High-temperature Optical Response of Electron-hole System in Bulk Semiconductors" Proceedings of the Symposium on Condensed Matter Photophysics '97. 189-192 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Mino, M.Yamamoto, T.Kawai, I.Akai, T.Karasawa T.Komatsu: "Observation of Coherent Propagation of the Exciton System in a Layered Crystal BiI_3 under the High Density Excitation" Proceedings of the Symposium on Condensed Matter Photophysics '98. 121-124 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamamoto, H.Mino, I.Akai, T.Karasawa T.Komatsu, V.F.Aguekian: "Optical Response of Photo-induced States for High Density Excitation in a Layered Crystal GaSe" Proceedings of the Symposium on Condensed Matter Photophysics '98. 113-116 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.nitta, M.Suzuki, T.Iida: "Structural Changes and Multistable Structures via Hole-doping in Strongly Coupled Electron-phonon Systems" Proceedings of the Symposium on Condensed Matter Photophysics '98. 315-318 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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