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

双激子体系玻色-爱因斯坦凝聚的相位共轭光谱研究

基本信息

  • 批准号:
    05402008
  • 负责人:
  • 金额:
    $ 8.06万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
  • 财政年份:
    1993
  • 资助国家:
    日本
  • 起止时间:
    1993 至 1996
  • 项目状态:
    已结题

项目摘要

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, and3.100% 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.
半导体晶体中的激子或双激子等激子粒子具有玻色子性质。人们预期激子粒子在激光的高密度光激发下发生玻色凝聚相的转变。本研究的目的是利用相位共轭光谱这一非线性光学目标,在CuCl双激子系统中,得到以下结果:1.在非相干激发下,用玻色分布函数再现了双激子的分布.在该条件下,观察到相位共轭(PC)信号强度的显著增强。当双激子密度超过玻色-爱因斯坦凝聚的临界密度时,可以观察到相应的增强,在注入非相干双激子的情况下,最大可实现3.100%的光子晶体信号强度增强。玻色分布函数很好地再现了激子的分布,2.发展了一种利用双光子共振激发产生非常冷且空间均匀的邻位激子的新方法。双光子共振激发下的邻位激子分布由低温玻色分布函数再现。结果表明,对于玻色-爱因斯坦凝聚,邻位激子的条件非常接近相边界。通过对双光子跃迁偏振特性的测量,证实了相位共轭光谱技术适用于研究邻位激子系统中的玻色-爱因斯坦凝聚.

项目成果

期刊论文数量(32)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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)
M. Hasuo 和 N. Nagasawa:“CuCl 中双激子的 BEC”“玻色-爱因斯坦凝聚”,A. Griffin、D. W. Snoke 和 S. Stringari 编辑,剑桥大学出版社 487-495。
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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)
M.Hasuo、H.Kawano 和 N.Nagasawa:“CuCl 中双激子吸收新模型的实验验证”Phys。
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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)
N.Naka 等人,:“Cu_2O 中 1s 激子系统的玻色-爱因斯坦凝聚的新方面”Prog.Crystal Growth and Charact.33。
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  • 影响因子:
    0
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  • 通讯作者:
S.Kono et.al.,: "Coherent Optical Processes of 1s Ortho-Excitons in Cu_2O by Two-Photon Excitation" Solid State Commun.(in print).
S.Kono 等人,:“通过双光子激发实现 Cu_2O 中 1s 正激子的相干光学过程”固态通讯(印刷中)。
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NAGASAWA Nobukata其他文献

NAGASAWA Nobukata的其他文献

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{{ truncateString('NAGASAWA Nobukata', 18)}}的其他基金

Research on biexcitons by ultra-high resolution two-photon solid state spectroscopy
超高分辨率双光子固态光谱研究双激子
  • 批准号:
    02452033
  • 财政年份:
    1990
  • 资助金额:
    $ 8.06万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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在分子/2D 范德华界面实现高温激子凝聚
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