Multi-phonon transitions in II-VI quantum dot

The intensity of polaron exciton absorption in a spherical quantum dot is c alculated. The localized electrons and holes are shown to interact with lon g-wavelength phonons with wave vectors q approximate to 1/R, R being the ra dius of the dot. In the case of strong electron-phonon interaction, the pol aron effect results in multiple phonon replicas of exciton optical transiti on. The broadening of different phonon replicas is shown to be less than th eir separation.