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

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Abstract
We present differential photoluminescence and reflectivity studies of GaAs-Ga1−x AlxAs quantum wells, using both wavelength-modulation and piezomodulation techniques. Our experiments permit unambiguous identification of light- and heavy-hole exciton transitions.