Abstract
Photoluminescence and polarized reflection spectra of quantum well structures with symmetric ${\mathrm{Cd}}_{0.9}{\mathrm{Zn}}_{0.1}\mathrm{Te}/\mathrm{CdTe}/{\mathrm{Cd}}_{0.9}{\mathrm{Zn}}_{0.1}\mathrm{Te}$ and asymmetric ${\mathrm{Cd}}_{0.9}{\mathrm{Zn}}_{0.1}\mathrm{Te}/\mathrm{CdTe}/{\mathrm{Cd}}_{0.4}{\mathrm{Mg}}_{0.6}\mathrm{Te}$ barriers were studied. The Stokes parameters of the reflected light from these structures were measured. In structures with asymmetric barriers, in the region of exciton resonances, the phenomenon of light birefringence was detected, caused by a lower symmetry of the interfaces compared with the symmetry of bulk crystals. A discussion of this phenomenon is given.
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