Inelastic light scattering of valence subband transitions in GaAs-GaAlAs multiple quantum wells.

We have measured the ground heavy-hole to first excited heavy- hole valence intersubband transition in GaAs-AlGaAs multiple quantum wells using resonant inelastic light scattering. The observed shift of the h sub 0 -> h sub 1 transition versus excitation energy is shown to be due to fluctuations in the widths of the quantum wells. Resonance profiles of high- and low-density samples exhibit different energy shifts in the presence of a magnetic field, pointing to the importance of screening in the intermediate state of the inelastic light scattering process.