Abstract
The cw, linearly and circularly polarized photoluminescence excitation spectra ( and ), are studied for (e1:hh1) excitons of undoped GaAs/As quantum wells. Monitoring in the high-energy range of the luminescence, pronounced 1S and 2S polarization-preserving bands are observed. They are shown to be due to LA-phonon-assisted relaxation of delocalized excitons. For the low-energy range ∼0 and a circular polarization reversal is observed, resulting from exciton-exciton scattering.
- Received 7 April 1993
DOI:https://doi.org/10.1103/PhysRevB.48.2803
©1993 American Physical Society