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Study on Bose-Einstein Condensation of Biexciton Systems by Phase-conjugation Spectroscopy

Research Project

Project/Area Number 05402008
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

NAGASAWA Nobukata  The University of Tokyo, School of Science, Professor, 大学院・理学系研究科, 教授 (50004437)

Co-Investigator(Kenkyū-buntansha) HASUO Masahiro  The University of Tokyo, School of Science, Research Assistant, 大学院・理学系研究科, 助手 (40218433)
伊藤 正  東北大学, 工学部, 教授 (60004503)
Project Period (FY) 1993 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥12,600,000 (Direct Cost: ¥12,600,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1994: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1993: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsSemiconductor / Exciton / Biexciton / Bose condensation / Phase-conjugation / Nonlinear optics / CuCl / Cu_2O / ボーズ凝縮 / 光学的非線形性
Research Abstract

An excitonic particle such as an exciton or a biexciton in a semiconductor crystal has a boson-like nature. It has been expected that the transition to Bose condensed phase of the excitonic particles occurs under a high density photo-excitation by laser light. The porpose of this research is to examined the expectation experimentally by means of a nonlinear optical aim of phase-conjugation spectroscopy.
In the biexciton system in CuCl, following results were obtained :
1. distributions of biexcitons were reproduced by Bose distribution functions in an incoherent excitation regime,
2. under the condition a remarkable enhancement of the phase-conjugate (PC) signal intensity was observed. The enhancement was observed correlatively when the biexciton density was beyond the critical density for the Bose-Einstein condensation, and
3.100% enhancement of the PC signal intensity was realized at the maximam under the injection of incoherent biexcitons.
In the exciton system in Cu_2O,following results were obtained :
1. distributions of excitons were well reproduced by Bose distribution functions,
2. a new method to generate very cold and spatially uniformed ortho-excitons using a two-photon resonant excitation was developed,
3. the distribution of ortho-excitons under the two-photon resonant excitation is reproduced by a Bose distribution function with a low temperature. The result suggested that the condition of the ortho-excitons was very close to the phase boundary for the Bose-Einstein condensation,
4. it was confirmed that the phase-conjugation spectroscopy were applicable to the study of the Bose-Einstein condensation in ortho-exciton system from the measurement of the polarization characteristics of the two-photon transition.

Report

(5 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] M.Hasuo et.al.: "Bose-Einstein condensation of biexciton system in CuCl" J.Lumin.60&61. 758-761 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo and N.Nagasawa: "BEC of Biexcitons in CuCl" ″Bose-Einstein condensation″,ed.by A.Griffin,D.W.Snoke and S.Stringari,Cambridge Univ.Press. 487-495 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo et.al.: "Experimental Verification of the New Model for the Two-Photon Absorption of Biexcitons in CuCl" phys.stat.sol.(b). 188. 77-81 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Naka et.al.: "A New Aspect of the Bose-Einstein Condensation of the 1s-Exciton System in Cu_2O" Prog.Crystal Growth and Charact.33. 89-92 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo and N.Nagasawa: "″An Experim ental Progress in the Bose-Einstein Condensation of the Biexciton System in CuCl″" Prog.Crystal Growth and Charact.33. 85-88 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Naka et.al.: "Study on Secondary Optical Processes by K-Selective Two-Photon Excitation of 1S-Ortho-Excitons in Cu_2O" Proc.of ICPS′96. 273-276 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo, N.Nagasawa, T.Itoh and A.Mysyrowicz: ""Bose-Einstein condensation of biexciton system in CuCl"" J.Lumin.60 & 61. 758-761 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo, N.Nagasawa: ""BEC of Biexcitons in CuCl"" "Bose-Einstein condensation", ed. by A.Griffin et al., Cambridge Univ. Press. 487-495 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo, H.Kawano and N.Nagasawa: ""Experimental Verification of the New Model for the Two-Photon Absorption of Biexcitons in CuCl"" Phys. stat. sol. (b). 188. 77-81 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Naka, S.Kono, M.Hasuo and N.Nagasawa: ""A New Aspect of the Bose-Einstein Condensation of the 1s-Exciton System in Cu_2O"" Prog. Crystal Growth and Charact.33. 89-92 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Hasuo and N.Nagasawa: ""An Experimental Progress in the Bose-Einstein Condensation of the Biexciton System in CuCl"" Prog. Crystal Growth and Charact.33. 85-88 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Naka, m. Hasuo, S.Kono and N.Nagasawa: ""Study on Secondary Optical Processes by K-Selective Two-Photon Excitation of 1S-Ortho-Excitons in Cu_2O"" Proc. of ICPS'96. 273-276 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Kono et.al.,: "Coherent Optical Processes of 1s Ortho-Excitons in Cu_2O by Two-Photon Excitation" Solid State Commun.97. 455-458 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Hasuo et.al.,: "Experimantal Examination of the Two-Photon XX Absorption Models by a New Type of Polarization Spectroscopy in CuCl" J.Lumin.66&67. 396-400 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Kono et.al.,: "Observation of Polarization Characteristics of Two-Photon Transition of Ortho-Exciton in Cu_2O by Resonance Emission" J.Lumin.66&67. 433-437 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Hasuo and N.Nagasawa: "An Experimental Progress in the Bose-Einstein Condensation of the Biexciton System in CuCl" Prog.Crystal Growth and Charact.33. 85-88 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Naka et.al.,: "A New Aspect of the Bose-Einstein Condensation of the 1s-Exciton System in Cu_2O" Prog.Crystal Growth and Charact.33. 89-92 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Naka et.al.,: "Study on Secondary Optical Processes by K-Selective Two-Photon Excitation of 1S-Ortho-Excitons in Cu_2O" Proc.of ICPS'96. 273-276 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Hasuo and N.Nagasawa: "BEC of Biexcitons in CuCl" ‘Bose-Einstein condensation',ed.by A.Griffin,D.W.Snoke and S.Stringari,Cambridge Univ.Press. 487-495 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Saito et.al.,: "Band Gap Energy and Binding Energies of Z_3-Excitons in CuCl" Solid State Commun.94. 33-35 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Hasuo et.al.,: "Experimental Verification of the New Model for the Two-Photon Absorption of Biexcitons in CuCl" phys.stat.sol.(b). 188. 77-81 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] A.L.Ivanov et.al.,: "Two-Photon Generation of Excitonic Molecules in CuCl:An Exactly Solvable Model and High-Precision Experiments" Phys.Rev.B. 52. 11017-11033 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Kono et.al.,: "Coherent Optical Processes of 1s Ortho-Excitons in Cu_2O by Two-Photon Excitation" Solid State Commun.(in print).

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Matsumot et.al.,: "Revised Interest on Yellow-Exciton Series in Cu_2O:An Experimental Aspect" Solid State Commun.(in print).

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Hasuo: "Bose-Einstein Condensation of Biexcitons in CuCl" “Bose-Einstein Condensation" edited by A.Griffin et al.Cambridge Univ.Press. 426- (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Hasuo: "Evaluation of |χ^<(3)>| at the GTA of biexcitons in CuCl by high resolution polarization spectroscopy" Journal of Luminescence. 672- (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Hasuo: "Bose-Einstein condensation of biexciton system in CuCl" Journal of Luminescence. 758- (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Saito: "Band Gap Energy and Binding Energies of Z_3-Excitons in CuCl" Solid State Communications. in press.

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Hasuo: "Experimental Verification of the New Model for the Two-Photon Absorption of Biexcitons in CuCl" Physica status solidi (b). in press.

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Hasuo: "Bose-Einstein Condensation of Biexcitons in CuCl" “Bose-Einstein Condensation"edited by A.Griffin et al.Cambridge Univ.Press. 426 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hasuo: "Evaluation of |χ(3)| at the GTA of biexcitons in CuCl by high resolution polarization spectroscopy" J.Luminescence. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hasuo: "Bose-Einstein Condensation of Biexciton System in CuCl" J.Luminescence in press. (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2020-05-15  

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