Dynamics of Self-Trapping of Hot Excitons Strongly Coupled to Phonons
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概要
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Dynamical self-trapping processes of photo-created hot excitons which interactsstrongly with phonons are theoretically studied in an effective-medium approxima-lion for Green functions. The previous formulation [S. Abe: J. Phys. Soc. Jpn. 57(1988) 4029] of the resonant secondary-emission spectrum in the dynamical coherentpotential approximation is extended in such a way that the effect of a finite bandwidth of the phonon branch relevant to self-trapping is taken into account. Emissionspectra calculated in this new method indicate that the intensity of hot luminescencefrom the metastable free state decreases with raising the incident-photon energy fromthe bottom of the free exciton band, suggesting that a part of hot excitons becomeself-trapped before they thermalize within the free exciton band states.
- 社団法人日本物理学会の論文
- 1990-04-15
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