SIZE EFFECT ON EXCITON-PHONON SCATTERING IN QUANTUM WIRES

Exciton-phonon scattering in GaAs/AlAs quantum wires is investigated b y means of Lee-Low-Pines transformations. For both heavy and light hol es, we study effects on the relaxation time due to confinement and tem perature. As expected, it is found that the scattering rate generally increases with the temperature. For a given temperature, it first incr eases with decreasing wire size to a peak, and then decreases as the s ize decreases further. The peak occurs at a larger size for light-hole excitons than for heavy-hole excitons.