LOCALIZATION AND ELECTRON-PHONON INTERACTIONS IN DISORDERED-SYSTEMS

We study numerically the time evolution of the coupled system of an el ectron, described by a tight-binding model exhibiting metal-insulator transition, interacting with vibrational degrees of freedom. Depending on the initial energy of the electron, E(e)(0), its effective mass, m , on how close to the mobility edge it is and the strength of the ele ctron-phonon coupling, different types of localized and extended state s are formed. We find, that, in general, an increase of E(e)(0) decrea ses the ability of the system to form localized states, a large m doe s not always favor localization and polaron formation is facilitated n ear the mobility edge.