ELASTIC AND DRIFT-DIFFUSION LIMITS OF ELECTRON-PHONON INTERACTION IN SEMICONDUCTORS

This paper deals with electron transport in semiconductors when electr on-phonon interaction is considered. Smallness of the mean free path c ompared to a characteristic length scale and of the phonon energy comp ared to the thermal energy of the crystal are assumed. The correspondi ng limits in the transport problem are carried out and shown not to co mmute. An intermediate limit leads to a new macroscopic model.