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Study of ultrafast relaxation dynamics of localized center in solids by femtosecond Raman spectroscopy

Research Project

Project/Area Number 03452037
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionNagoya University

Principal Investigator

NAKAMURA Arao  Faculty of Engineering Professor, 工学部, 教授 (50159068)

Co-Investigator(Kenkyū-buntansha) TOKIZAKI Takashi  Nagoya University Faculty of Engineering Assistant Professor, 工学部, 助手 (20207541)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥6,400,000 (Direct Cost: ¥6,400,000)
Keywordselectron-phonon interaction / relaxation process / F center / self-trapped hole / self-trapped exciton / coherent Raman spectroscopy / 自己捕獲正孔 / 緩和励起子 / フェムト秒ポンプ・プロ-ブ分光 / 超心速緩和過程 / アルカリハライド / 束縛励起子
Research Abstract

1)Installation of a femtosecond laser system.
We installed a high power femtosecond laser system which provided pumping pulses with wavelengths of 600 and 300 nm,probe pulses with a white continuum in the spectral range of 400 to 950 nm and a pulse duration of 100 fs.
2) Femtosecond nonlinear spectroscopy in alkali halides:
a) We found that the relaxation process on the adiabatic potential energy surface (APES) of F center in KBr is dynamical and occurs within 100 fs. b) In the formation processes of F center in KBr, an F center is formed before the self-trapping of a hole and the F center relaxation occurs from the on-center type self-trapped exciton (STE). c) We observed for the first time the oscillation of the STE as a wavepaquet between two minima on the lowest APES in KI. d) In alkali iodides (KI and RbT) a free hole is first converted to a one-center self-trapped hole and subsequently a two-center self-trapped hole (V_k center) is formed. Furthermore, the initial stage of self-trapping of a exciton does not consist of a V_k-like center and a free electron but a one-center self-trapped hole correlated with an electron is one of the precursor states for the STE formation. These are the first experimental finding of the initial processes of the self-trapping.
3) Femtosecond nonlinear spectroscopy in ZnTe:O: We observed the relaxation processes of bound excitons with the intermediate coupling with phonons. The exciton-lattice relaxation with emission of LO phononsoccurs with a period of the LO phonon.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] T.Tokizaki: "Ultrafast Formation Processes of Self-Trapped Excitons in Alkali Crystals under Band-to-Band Excitation" Ultrast Phenomena VIII. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tokizaki: "Femtosecond Cascade-Excitation Spectroscopy for Nonradiative Deexcitation and Lattice Relaxation of the Self-Trapped Exciton in NaCl" Physical Review Letters. 67. 2701-2704 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Tanimura: "Femtosecond dynamics of exciton relaxation alkali halides" Proceedings of Conference of Defects in Solids. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Iwai: "Femtosecond spectroscopy of self-trapping processes of holes and excitons in alkali halides" J.Luminescence. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 1)T. Tokizai, T. Makimura, H. Akiyama, A. Nakamura, K. Tanimura and N. Itoh: "Femtosecond cascade-excitation spectroscopy for nonradiative deexcitation and lattice relaxation of the self-trapped exciton in NaCl" Phys. Re. Lett. 67. 2701-2704 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 2)T. Tokizaki, S. Iwai, T. Shibata, A. Nakamura, T. Tanimura and N. Itoh: "Ultrafast formation processes of self-trapped excitons in alkali iodide crystals under band-to-band excitation." Ultrafast Phenomena VIII. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 3) K. Tanimura, T. Makimura, T. Shibata, N. Itoh, T. Tokizaki, S. Iwai and A. Nakamura: "Femtosecond dynamics of exciton relaxation in alkali halides" Proceedings of Conference of Defects in Solids. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 4) S. Iwai, T. Tokizaki, a. Nakamura, T. Shibata, K. Tanimura and N. Itoh: "Femtosecond spectroscopy of self-trapping processes of holes and exitons in alkali halides." J. Luminescence. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tokizaki: "Ultrafast Formation Processes of Self-Trapped Excitons in Alkali Iodide Crystals under Band-to-Band Excitation" Ultrafast Phenomena VIII. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Tokizaki: "Femtosecond Cascade-Excitation Spectroscopy for Nonradiative De-excitation and Lattice Relaxation of the Self-Trapped Exciton in NaCl" Physical Review Letters. 67. 2701-2704 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Tokizaki,T.Makimura,H.Akiyama,A.Nakamura,K.Tanimura,N.Itoh: "Femtosecond cascadeーexcitafion spectrosoopy for nonradiative deexcitation and lattice relaxation of selfーtrapped exciton in NaCl" Phys.Rev.Lett.67. 2701-2704 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] A.Nakamuram,T.Tokizaki: "Ultrafast optical nonlinearity of semiconducting microcrystallites in glass matrices" Proceedings of Toyota conference on nonlinear optical materials. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Tokizaki,S.Iwai,T.Shibata,A.Nakamura,K.Tanimura,N.Itoh: "Ultrafast formation processes of selfーtrapped excitons in alkaliーiodide crystals under bandーtoーband excitation" Phys.Rev.(1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 中村 新男: "固体におけるフェムト秒緩和過程" オプトロニクス. 124. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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