Relaxation of the momentum of free excitons in semiconductors
Zinov'ev N. N. , Ivanov L. P. , Lang I. G. , Pavlov S. T. , Prokaznikov A. V. , Yaroshetskii I. D.
The relaxation time of the momentum of free excitons in semiconductors (CdS) is measured for the first time over a wide temperature range 10-300 K. For T< 60 K, the relaxation is determined by scattering of the exciton by piezoacoustic phonons, while for T> 100 K, scattering by optical phonons dominates.