EXCITONS IN SEMICONDUCTOR NANOSTRUCTURES WITH DISORDER

Excitons in quantum structures with alloy as well as interface disorde r are treated. The optical properties follow from a solution of the Sc hrodinger equation describing the exciton center-of-mass motion. The a bsorption linewidth is always is smaller than the underlying potential variation (motional narrowing). Using a kinetic approach with acousti c phonon scattering, luminescence lineshapes are calculated showing no n-equilibrium exciton distributions. Spatially resolved spectroscopy a llows to extract information on individual exciton eigenstates.