Abstract
We develop a theoretical method of calculating the dynamics of excitons in biased semiconductor superlattices, including exciton-LO-phonon interactions. We use this method to determine phonon-induced excitonic decoherence in the interband and intraband polarizations. We find that the intraband decoherence time is much longer than one would expect from a simple extrapolation from the interband decoherence time. The longer decoherence time is shown to be due to the persistence of intraband coherence after exciton-phonon scattering events. The results are found to be in qualitative agreement with recent experiments.
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