Photoluminescence spectra of quantum dots: Enhanced efficiency of the electron-phonon interaction

A theory of photoluminescence in semiconductor quantum dots is developed wh ich relies on two key ingredients. First, it takes into account non-adiabat icity of the exciton-phonon system. Second, it includes the multimode diele ctric model of LO-phonons and of the electron-phonon interaction in confine d systems. The role of non-adiabaticity is shown to be of paramount importa nce in spherical quantum dots. where the lowest one-exciton state can be de generate nr quasi-degenerate. For various quantum dot structures, the calcu lated intensities of phonon satellites as a function of temperature, excita tion energy and size of quantum dots are in a fair agreement with experimen tal data on photoluminescence.