LONGITUDINAL-OPTICAL-PHONON EFFECTS ON EXCITONS IN GAAS-GA1-XALXAS QUANTUM-WELL

We have calculated the effects of the longitudinal optical phonons on the exciton binding energy in a quantum well, consisting of a single s lab of GaAs sandwiched between tyro semi-infinite slabs of Ga1-xAlxAs, as a function of the size of the GaAs well. We have found that tile c orrection due to the bulk-like LO-phonon effects on the exciton bindin g energy is quite larger than that due to the confined LO-phonon effec ts and that these effects on the binding energy of the light-hole exci ton are larger than those of the heavy-hole exciton. Our results are c ompared with recent experimental data, and good agreement has: been fo und.