Differential spectroscopy of GaAs-Ga1−xAlxAs quantum wells: An unambiguous identification of light-hole and heavy-hole states

Abstract

We present differential photoluminescence and reflectivity studies of GaAs-${\mathrm{Ga}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Al}}_{\mathrm{x}}$As quantum wells, using both wavelength-modulation and piezomodulation techniques. Our experiments permit unambiguous identification of light- and heavy-hole exciton transitions.