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Dynamics of Optically Established Quantum Condensate Phases in Semiconductors

Research Project

Project/Area Number 14340095
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  Osaka City University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (90106336)

Co-Investigator(Kenkyū-buntansha) AKAI Ichiro  Osaka City University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助教授 (20212392)
KANEMOTO Katsuichi  Osaka City University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (40336756)
IIDA Takeshi  Osaka City University, Graduate School of Science, Honorary Professor, 大学院・理学研究科, 教授 (80047191)
SUZUKI Masato  Osaka City University, Graduate School of Science, Lecturer, 大学院・理学研究科, 講師 (70254381)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥11,900,000 (Direct Cost: ¥11,900,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2002: ¥6,200,000 (Direct Cost: ¥6,200,000)
Keywordslayered semiconductors / BiI_3 stacking fault exciton / GaSe / coherent propagation of excitons / Bose-Einstein Condensation of excitons / degenerate four-wave-mixing / nonlinear optical responses / Gross-Pitaevski equation / 励起子のボーズ凝縮 / 非線形光学応答
Research Abstract

In layered crystals BiI_3, and GaSe, we have studied spatial and temporal behavior of high-density exciton masses and their nonlinear optical response in connection with coherent motion of the exciton masses in a photo-induced quantum condensed phase such as the Base-Einstein condensation (BEC), by observing spatial expansion of the resonance luminescence and the degenerate four-wave-mixing (DFWM) light induced by spatially isolated two laser-light spots on the sample surface in the space-resolved regime.
In BiI_3, spatial expansion of the excitons confined in a quasi tow-dimensional stacking fault interface (SFE) was examined in the space- and time-resolved photoluminescence under the spot excitation with a picosecond laser light tuned to the SFE state. The space and time evolution of the luminescence intensity was analyzed by applying a nonlinear Schrodinger equation (Gross-Pitaevski equation) by considering weakly repulsive exciton-exciton interaction. It shows that the expansion of … More the exciton masses is reproduced in accordance with the observed results. The DFWM light was emitted owing to the coherent transport of the exciton masses from one to the other spot sites showing evidently the SFE masses being in a condensed phase. On the other hand, in GaSe, the exciton luminescence under heavy excitation is characterized by the recoil process due to scattering with the other excitons or carriers. In the luminescence process at high density, the inelastic scattering between excitons with relatively large energies governs dominantly the dynamical process of exciton masses revealing the recoil luminescence, and showing also the remarkable response on the DFWM excitation spectra. It turns out that this strongly repulsive interaction between excitons prevents the establishment of their coherent quantum condensed phase, in contrast to the case of the BiI_3 SFE system.
In the quantum wire structures of GaAs/AlAs system, dynamical behavior of the heavily excited excitons and their relaxation process have been examined. It is found that a repulsive interaction between excitons brings about remarkable spectral blue-shifts and site-filling effects. The curious behavior is understood to be a characteristic in low dimensional exciton systems.
In other materials, such as Alq_3, light-harvesting dendrimers, π-conjugated conducting polymer : polythiophene, highly luminescent hexanucler 6-methylpyridinetholato copper(1), we have investigated exciton transitions and luminescence spectra under high density excitation. In these materials some interesting optical responses and relaxation processes are made clear with respect to the exciton-exciton interaction and many-body effects. The details are future problems. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (45 results)

All 2005 2004 2003 2002 Other

All Journal Article (29 results) Publications (16 results)

  • [Journal Article] Rapid energy transfer in light-harvesting small dendrimers2005

    • Author(s)
      I.Akai
    • Journal Title

      J. Lumin. 112

      Pages: 449-453

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structure Study and Luminescence Thermochromism in Hexanuclear 6-Methyl-2-Pyridinethiolato Copper(I) Crystals2005

    • Author(s)
      H.Xie
    • Journal Title

      J. Phys. Chem. B109

      Pages: 9339-9345

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Concentration-dependence of photoluminescence properties in polythiophene diluted in an inactive polymer matrix2005

    • Author(s)
      K.Kanemoto
    • Journal Title

      Chem. Phys. Lett. 402

      Pages: 549-553

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Quantum-Disk Excitons and Their Interaction with Phonons in BiI_32005

    • Author(s)
      D.Kim
    • Journal Title

      J. Phys. Soc. Jpn 74

      Pages: 1309-1319

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Dynamics of unidirectional exciton migration to the molecular periphery in a photoexcited compact dendrimer2005

    • Author(s)
      K.Nishioka
    • Journal Title

      J. Chem. Phys. 122

      Pages: 24708-24708

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Quantum-Disk Excitons and Their Interaction with Phonons in Bils2005

    • Author(s)
      D.Kim, T.Karasawa, T.Iida, T Komatsu
    • Journal Title

      J.Phys.Soc.Jpn. 74

      Pages: 1309-1319

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Dynamics of unidirectional exciton migration to the molecular periphery in a photoexcited compact dendrimer2005

    • Author(s)
      K.Nishioka, M.Suzuki
    • Journal Title

      J.Chem.Phys. 122

      Pages: 24708-24708

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Concentration-dependence of photoluminescence properties in polythiophene diluted in an inactive polymer matrix2005

    • Author(s)
      K.Kanemoto
    • Journal Title

      Chem.Phys.Lett. 402

      Pages: 549-553

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Quantum-disk excitons and their interaction with phonons in BiI_32005

    • Author(s)
      D.G.Kim
    • Journal Title

      J.Phys.Soc.Jpn. 74

      Pages: 1-11

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Rapid energy transfer in light-harvesting small dendrimers2005

    • Author(s)
      I.Akai
    • Journal Title

      J.Lumin. (In press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Structure study and luminescence thermochromism in hexanuclear 6-methyl-2-pyridinethiolato-copper (I) crystals2005

    • Author(s)
      H.Xie
    • Journal Title

      J.Phys Chem. B(in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Luminescence processes of hxanuclear methylpyridinethiolato-copper (I) crystals2004

    • Author(s)
      H.Xie
    • Journal Title

      J. Lumin. 108

      Pages: 91-95

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Photocalorimetric study on nonradiative relaxation processes and photoluminescence quantum yields in Alq_3 single crystals2004

    • Author(s)
      I.Akai
    • Journal Title

      J. Lumin. 108

      Pages: 11-14

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Luminescence of Stepped Quantum Wells in GaAs/GaAlAs and InGaAs/GaAs/GaAlAs Structures2004

    • Author(s)
      V.F.Agekyan
    • Journal Title

      Semiconductors 38

      Pages: 565-571

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Many-body effects in molecular photoionization in intense laser fields; time-dependent Hartree-Fock simulations2004

    • Author(s)
      M.Suzuki
    • Journal Title

      J. Chem. Phys. 120

      Pages: 669-676

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Luminescence processes of hexanuclear methyl pyridinethiolato-copper (1) crystals2004

    • Author(s)
      H.Xie
    • Journal Title

      J.Lumin. 108

      Pages: 91-95

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photocalorimetric study on nonradiative relaxation processes and photoluminescence quantum yields in Alq_3 single crystals2004

    • Author(s)
      I.Akai
    • Journal Title

      J.Lumin.

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Luminescence of stepped quantum wells in GaAs/GaAlAs and InGaAs/GaAs/GaAlAs structures2004

    • Author(s)
      V.F.Agekyan
    • Journal Title

      Semiconductors 38

      Pages: 565-571

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Morphology and Optical Spectra of Metal Iodate Microcrystals in Porous Matrices2003

    • Author(s)
      V.F.Agekyan
    • Journal Title

      Phys. Solid State 45

      Pages: 1170-1176

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Dynamical Processes of High-Density Excitons in GaSe Crystals2003

    • Author(s)
      A.Tanji
    • Journal Title

      J. Phys. Soc. Jpn. 72

      Pages: 2646-2655

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Charge and bonding redistribution in octatetraene driven by a strong laser field : Time-dependent Hartree-Fock simulation2003

    • Author(s)
      M.Suzuki
    • Journal Title

      J. Chem. Phys. 119

      Pages: 4722-4730

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Macroscopically coherent motion of exciton masses in layered semiconductor crystals2003

    • Author(s)
      T.Karasawa
    • Journal Title

      Porc. CREST & QNN'03 Joint International Workshop

      Pages: 165-170

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High-density effects on the exciton systems and their dynamical behavior in Al_xGa_<l-x>As/AlAs Quantum Wires2002

    • Author(s)
      K.Bando
    • Journal Title

      Phase Transition 75

      Pages: 1011-1017

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Photo-Induced High-Density Phases of Exciton-Polariton Masses and Their Coherent Propagation at Stacking Fault Interface in BiI_32002

    • Author(s)
      T.Karasawa
    • Journal Title

      Phase Transition 75

      Pages: 707-714

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Anisotropic Diffusion Behavior of Quasi-one Dimensional Excitons in Al_<0.2>Ga_<0.8>As/AlAs Quantum Wire2002

    • Author(s)
      K.Bando
    • Journal Title

      Nonlinear Optics 29

      Pages: 197-202

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear Luminescence of Excitons in HgI$_2$ Micro-crystallites on Porous Polymers2002

    • Author(s)
      I.Akai
    • Journal Title

      Nonlinear Optics 29

      Pages: 345-350

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Multiple Exciton Interaction in Condensates of Excitons at a Stacking Fault Interface in BiI_32002

    • Author(s)
      A.Tanji
    • Journal Title

      Nonlinear Optics 29

      Pages: 339-344

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Optical Properties of Hexanuclear 6-Methylpyridinethiolato-Copper(I) Crystals2002

    • Author(s)
      H.Y.Xie
    • Journal Title

      Nonlinear Optics 29

      Pages: 647-653

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Study of dynamics of anisotropic vibrational energy migration in dendrimer macromolecule by using a classical oscillator model2002

    • Author(s)
      K.Nishioka
    • Journal Title

      J. Chem. Phys. 117

      Pages: 7793-7801

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] T.Karasawa: "Macroscopically Coherent Motion of Exciton Masses in Layered Semi-conducting Crystals"Proceedings of Crest & QNN'03 Joint International. 165-170 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Xie: "Luminescence Processes of Hexanuclear Methylpyridinethiolato-Copper (I) Crystals"J. Lumin.. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] V.F.Agekyan: "Morphology and Optical Spectra of Metal lodate Microcrystals in Porous Matrices"Phys.Solid State. 45. 1170-1176 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Tanji: "Dynamical Processes of High-Density Excitons in GaSe Crystals"J.Phys.Soc.Jpn.. 72. 2646-2655 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kobayashi: "Superfluidity of Disordered Bose Systems : Numerical Analysis of the Gross Pitaevskii Equation with Random Potential"Physica B. 329-333. 210-211 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Suzuki: "Many-body Effects in Molecular Photoionization in Intense Laser Fields ; Time-dependent Hartree-Fock Simulations"J.Chem.Phys.. 120. 669-676 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Suzuki: "Many-body Effects in Molecular Photoionization in Intense Laser Fields ; Time-dependent Hartree-Fock Simulations"J.Chem.Phys.. 120. 669-676 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] I.Akai: "Photocalorimetric Study on Nonradiative Relaxation Processes and Photoluminescence Quantum Yields in Alq_3 Single Crystals"J.Lumin.. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Karasawa, A.Tanji, I.Akai: "Photoinduced High-density Phase of Exciton-polariton Masses and Their Coherent Propagation at Stacking Fault Interface in BiI_3"Phase Transitions. 75. 707-714 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] I.Akai, A.Yamamoto, T.Karasawa, V.F.Aguekian: "Nonlinear Luminescence of Excitons in HgI_2 Microcrystallites on Porous Polymers"Nonlinear Optics. 29. 345-350 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Bando, I.Akai, T.Karasawa, K.Maehashi, H.Nakashima: "High Density Effects on the Exciton Systems and Their Dynamical Behavior in Al_xGa_<1-x>As/AlAs Quantum Wires"Phase Transitions. 75. 1011-1017 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Haiyan Xie, M.Tougezaka, I.Kinoshita, K.Kanemoto, I.Akai, T.Karasawa: "Optical Properties of Hexanuclear 6-Methyl Pyridine Thiolato-Copper(I) Crystals"Nonlinear Optics. 29. 647-653 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Nishioka, M.Suzuki: "Dynamics of Anisotropic Migrations of Exciton and Phonon in Dendrimer Systems"Nonlinear Optics. 29. 641-646 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Nishioka, M.Suzuki: "Study of Dynamics of Anisotropic Vibrational Energy Migration in Dendrimer Macromolecule by using a Classical Oscillator Model"J.Chem.Phys.. 117. 7793-7801 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Iida, M.Tsubota: "Ordered State and Superfluidity of Quasi-two-dimensional Excitons in Type-II Quantum Wells"Phase Transitions. 75. 961-969 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Kobayashi, M.Tsubota, T.Iida: "Superfluidity of Disordered Bose Systems : Numerical Analysis of the Gross-Pitaevskii Equation with a Random Potential"Physica. B(印刷中). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2020-05-15  

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