Interface roughness correlation in CdTe/CdZnTe strained quantum wells
Résumé
In CdTe/CdZnTe strained quantum wells (QWs) the exciton inhomogeneous linewidth decreases with decreasing QW width. We interpret this unusual behaviour as a manifestation of the fact that the two QW heterointerfaces are increasingly correlated for narrow QWs, resulting in reduced well width fluctuation along the QW plane. Small incidence angle X-ray diffraction experiments confirm this interpretation.