Light-hole quantization in the optical response of ultrawide   GaAs/Al$_x$Ga$_{1-x}$As quantum wells
  Temperature-dependent reflectivity and photoluminescence spectra are studied for undoped ultra-wide 150 nm and 250 nm GaAs quantum wells. It is shown that spectral features previously attributed to a size quantization of exciton motion in z-direction coincide well with energies of quantized levels for light holes. Furthermore, optical spectra reveal very similar properties at temperatures above exciton dissociation point. 
V.V. Solovyev, V.A. Bunakov, S. Schmult and I. V. Kukushkin
cond-mat.mes-hall