Abstract
A spatially inhomogeneous shift of the center-of-mass potential energy for excitons in a disordered nanostructure affects the directionally and temporally resolved speckle pattern in the secondary emission. It leads to a modification of both shape and orientation of the average speckle. We analyze the cases of linear and quadratic energy shift and find analytical expressions for the corresponding speckle correlation functions. The tilting of the correlation is given by the local energy gradient, while the correlation width dynamics is determined by the energy curvature. The speckle temporal shape is related to the local Rayleigh spectrum, whose broadening due to the potential energy modification is here investigated. These findings are confirmed by the agreement with full numerical simulations. Speckles provide therefore precise information also about systematic potentials affecting the exciton motion. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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