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Abstract
Time-resolved photoluminescence (PL) spectra have been measured in a GaAs single quantum well prepared by growth-interrupted molecular beam epitaxy. In addition to the usual Stokes shift caused by the exciton transfer from narrower to wider quantum well islands with macroscopically flat terraces, a dynamical Stokes shift is observed in the transient PL spectra for each excitonic line from the different monolayer islands. The continuous change of the PL peak energy with time reflects the localization of excitons within the islands. This observation directly proves the existence of interface nanoroughness with a lateral length scale smaller than the exciton Bohr radius.
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