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Temperature-dependent reflectivity and photoluminescence spectra are studiedfor undoped ultra-wide 150 nm and 250 nm GaAs quantum wells. It is shown thatspectral features previously attributed to a size quantization of excitonmotion in z-direction coincide well with energies of quantized levels for lightholes. Furthermore, optical spectra reveal very similar properties attemperatures above exciton dissociation point.

Light-hole quantization in the optical response of ultrawide GaAs/Al$_x$Ga$_{1-x}$As quantum wells