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Numerical and experimental results on the effect of randomness in superlattices having a small number of randomly distributed well widths are reported. The numerical results indicate the splitting of the extended state miniband into sub-minibands of localized states having a disorder-induced fine structure. The comparison between the experimental results for low-temperature absorption spectra and the computed joint density of states of the investigated samples confirms the predicted features. The high-temperature photoluminescence intensity of random superlattices is observed to be enhanced with respect to the ordered case.
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Lorusso et al. (1996) studied this question.
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