On the possibility of the direct study of local electron-phonon interaction in semiconductors

Local electron-phonon interaction in deep-level states of defects in semiconductors was studied by induced absorption spectroscopy. Using ZnS:Cu single crystals as an example, it was shown that the laser modulation of two-step impurity absorption is an efficient technique for direct investigations of phonon relaxation effects in deep-level states. It was shown that the localized states in ZnS are prone to extremely strong electron-phonon coupling.