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Quantum Dynamics of Soliton-Pair Creation in Quasi-One-Dimensional Halogen-Bridged metal Complexes

Research Project

Project/Area Number 10640319
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

IWANO Kaoru  Institute of Materials Structure Science, High Energy Accelerator Research Organization, Research Associate, 物質構造科学研究所, 助手 (10211765)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsCDW / Soliton / Relaxed State / Non-Radiative Transition / Phonon Mode / Electron-Lattice Interaction / 緩和状態 / 無輻射遷移 / ハロゲン架橋金属錯体 / 自己束縛励起子 / 非断熱遷移 / サイト対角型電子格子モデル
Research Abstract

In this project we have estimated the probability of the non-radiative transition from the relaxed state (confined soliton and antisoliton) in the first excited state to the ground state, in the framework of a non-degenerate charge-density-wave(CDW) model.
All through this project, the main problem has been how to incorporate modes of phonons which are ruling the degree of non-adiabatic transitions. In the first year, we only treated the relative coordinate between the soliton and the antisoliton to find that the obtained probability was very small and so the selection was not enough. By detailed analysis, we clarified that the reason was the lack of long-wave phonons which are very closely related to the concerned transition. Therefore we tackled with the problem of how to include such many modes, in the second year.
As the first method, we have added the amplitude of a deformation localized around the solitons as the second mode. Here the deformation is prepared to consist mainly of the modes close to k=0. Thus the purpose of this method is to check the prediction in the first year. As a result, the probability drastically increases to give the life time of about 8.6 ns for a certain parameter set. (Cf : it was about 12 ms in the case of one-coordinate treatment)
Next, we have included cosine-type modes, instead of the localized mode. Such modes are added from the k=o one in increasing order. Fortunately, modes with different wave numbers can be treated almost independently. Thus, their contributions become additive without any interference with each other. In this situation, we have increased the number of modes from 1 to 40 in the system with 200 sites. As a result, the probability almost reaches to saturation at the number of 25. Finally, we have obtained the value of 110 ps as the life time, which is consistent with the result by the semi-classical method, namely, 80 ps.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 岩野薫: "Mechanism for Photoinduced phase transitions in low-dimensional clectron-lattice systems:Nonlinearity with respect to excitation density ance・・・"Phys. Rev. B. 61. 279-289 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 岩野薫: "a possilde mechanism for photoinduced structural phase transitions in low-aimensioual election-lattice systems"J. Lumin. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 岩野薫: "Nonlinear excitations in charge-and spin-density-wave materials-Ercitons,solitons and (bi) polarous"Synthetic Metals. 103. 2620-2623 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Iwano: ""Mechanism for photoinduced phase transitions in low-dimensional electron-lattice systems : Nonlinearity with respect to excitation density and aggregation of excited domains""Phys. Rev. b. 61-1. 279-289 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Iwano: ""A possible mechanism for photoinduced structural phase transitions in low-dimensional electron-lattice systems""J. Lumin. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Iwano: ""Nonlinear excitations in charge- and spin-density-wave materials-Excitons, solitons and (bi)polarons""Synthetic Metals. 103. 2620-2623 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 岩野薫: "Mechanism for photo induced phase transitions in low-dimensional electron-lattice systems : Nonlinearity which respect to excitation density and aggregation of excited domains."Phy. Rev. B. 61. 279-289 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 岩野薫: "α possible mechanism for photo induced structural phase transitions in low-dimensional electron-lattice systems"J. Lumin.. in press.

    • Related Report
      1999 Annual Research Report
  • [Publications] 岩野薫 他: "Nonlinear excitations in charge - and spin-density-waul materials - Excitons, selitons and (bi) polarons"Synthetic Metals. 103. 2620-2623 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Iwano et.al.: "Nonlinear Excitations in Charge-and Spin-Density-Wave Materials-Excitons,Solitons and (Bi)Polarons" Synthotic Metals. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2020-05-15  

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