On the possibility of observing electron-phonon UMKLAPP-processes in photoconductive spectral response of semiconductors

Dips in the photoconductive spectral response of many-valleyed semiconductors at multiples of the intervalley phonon emission threshold energies are predicted; in analogy to the photoconductivity oscillations due to LO phonon interaction observed in many semiconductors. The conditions for a successful experiment are discussed in detail for the case of donor-conduction band transitions in Si. © 1968.