Abstract
Optical properties of (1 1 3)-grown GaAs-(GaAl)As single quantum wells (SQW's) have been studied by wavelength- and piezomodulated spectroscopy. A supermodulation of light hole states is observed in piezomodulation spectroscopy. The theoretical methods required to compute the envelope functions and the stress dependence of the transition energies are detailed. A close agreement is obtained between the experimental observations and the theoretical predictions.