中国物理B ›› 2009, Vol. 18 ›› Issue (9): 3940-3951.doi: 10.1088/1674-1056/18/9/054

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Localized self-trapping in the two-dimensional discrete molecular lattice with the interaction between Frenkel excitons and phonons

田强1, 徐权2   

  1. (1)Department of Physics, Beijing Normal University, Beijing 100875, China; (2)Department of Physics, Daqing Normal University, Daqing 163712, China;Department of Physics, Beijing Normal University, Beijing 100875, China
  • 收稿日期:2009-03-19 修回日期:2009-04-22 出版日期:2009-09-20 发布日期:2009-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 1057400), and the Natural Science Foundation of Heilongjiang Province of China (Grant No A200506).

Localized self-trapping in the two-dimensional discrete molecular lattice with the interaction between Frenkel excitons and phonons

Xu Quan(徐权)a)b)† and Tian Qiang(田强)b)   

  1. a Department of Physics, Daqing Normal University, Daqing 163712, China; b Department of Physics, Beijing Normal University, Beijing 100875, China
  • Received:2009-03-19 Revised:2009-04-22 Online:2009-09-20 Published:2009-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 1057400), and the Natural Science Foundation of Heilongjiang Province of China (Grant No A200506).

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摘要： We investigate the interactions of lattice phonons with Frenkel exciton, which has a small radius in a two-dimensional discrete molecular lattice, by the virtue of the quasi-discreteness approximation and the method of multiple-scale, and obtain that the self-trapping can also appear in the two-dimensional discrete molecular lattice with harmonic and nonlinear potential. The excitons' effect on the molecular lattice does not distort it but only causes it to localize which enables it to react again through phonon coupling to trap the energy and prevent its dispersion.

Abstract: We investigate the interactions of lattice phonons with Frenkel exciton, which has a small radius in a two-dimensional discrete molecular lattice, by the virtue of the quasi-discreteness approximation and the method of multiple-scale, and obtain that the self-trapping can also appear in the two-dimensional discrete molecular lattice with harmonic and nonlinear potential. The excitons' effect on the molecular lattice does not distort it but only causes it to localize which enables it to react again through phonon coupling to trap the energy and prevent its dispersion.

Key words: self-trapping, Frenkel exciton, two-dimensional discrete molecular lattice, phonon

中图分类号:  (Phonon interactions with other quasiparticles)

  • 63.20.kk
71.35.-y (Excitons and related phenomena) 71.35.Aa (Frenkel excitons and self-trapped excitons)