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A theoretical description of local absorption is proposed in order to investigate spectral variations on a length scale comparable with the extension of the relevant quantum states. A general formulation, including Coulomb correlation, is derived within the density-matrix formalism and applied to the prototypical case of coupled quantum wires. The results show that excitonic effects may have a crucial impact on the local absorption, with implications for the spatial resolution and the interpretation of near-field optical spectra.
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Mauritz et al. (1999) studied this question.
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