Influence du couplage électron-phonon sur les états excitoniques dans les microsphères de semi-conducteur : application à CuCl et CdSe

Abstract : We study theoreticaly the influence of electron-phonon interaction on excitons in spherical semiconductor microcrystals. The effect of the quantum confinement is described by an infinitely deep potential well in the framework of the envelope function approximation associated with two non degenerate bands. The electron-optical phonon coupling is treated within the adiabatic approximation. We consider first the donorlike exciton model : the hole, much heavier than the electron, is located at the center of the microsphere. A variational calculation of the ground-state energy allows us to show that the exciton-optical phonon interaction energy is strongly size dependent. Then we describe the ground-state exciton considering the hole motion by the use of a five parameter trial envelope function. We determine the Huang-Rhys factor S associated to the exciton, which is a measure of the charge-carrier-optical phonon coupling and the extent of the exciton charge distribution, in small microspheres in the case of CuCl and CdSe. However this model is not well adapted to compounds exhibiting degenerated valence bands as CdSe. The simple theoretical model of a donorlike exciton is in agreement with experiment
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Jean-Claude Marini. Influence du couplage électron-phonon sur les états excitoniques dans les microsphères de semi-conducteur : application à CuCl et CdSe. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ036S⟩. ⟨tel-01776724⟩

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