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Phys Rev Lett. 2002 Apr 8;88(14):146803. Epub 2002 Mar 26.

Excitonic polarons in semiconductor quantum dots.

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Laboratoire de Physique de la Matière Condensée ENS, 24 rue Lhomond F75005 Paris, France.


The discretization of the electronic spectrum in semiconductor quantum dots implies a strong coupling behavior between the optical phonons and the electron-hole pairs, despite the fact that a pair is electrically neutral. The excitonic polarons strongly modify the optical spectra. In particular, the ground excitonic polaron contains one or two phonon components, which leads to the existence of phonon replicas in the luminescence. The population and coherence decay times of the optical transition associated with the ground excitonic polaron are calculated.

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