The contribution of many-body effects in the optical nonlinearity of excitons in multiple quantum wells is studied through optical pump-and-probe experiments. It is found that, when a dense electron-hole population is photoexcited, the renormalization of unoccupied subbands is relatively weak, in contrast to the strong effect observed in luminescence. This result points out the limitations of the rigid-shift model for band-gap renormalization.
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Levenson et al. (1988) studied this question.
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