Abstract
Abstract We have studied the optical properties of GaAs1 - xP x /Ga0.65 Al0.35 As quantum wells as a function of well width and phosphorus concentration in the presence of an external magnetic field. The combination of confinement and lattice-mismatch effects in this system allows tuning of the splitting between the heavy-hole and light-hole subbands. The ground- and excited-state energies of the excitons are obtained from low-temperature photoluminescence excitation spectroscopy. From an analysis of the fan diagrams, using a two-dimensional hydrogenic model, we have determined the binding energies and the reduced effective masses of the heavy-hole and light-hole excitons. An enhancement of the effective masses of the holes is observed as the heavy- and light-hole subbands approach. An unexpected behaviour of the degree of polarization of the excitons with increasing magnetic field is also observed.
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