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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Decoherence of intraband transitions in InAs quantum dots
verfasst von : Thomas Grange, Robson Ferreira, Gérald Bastard
Erschienen in: Optical Generation and Control of Quantum Coherence in Semiconductor Nanostructures
Verlag: Springer Berlin Heidelberg
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The origin of the dephasing of the S-P intersublevel transitions in semiconductor quantum dots is theoretically investigated. The coherence time of this transition is shown to be lifetime-limited at low temperature, while at higher temperature pure dephasing induced by the coupling to acoustic phonons dominates the coherence decay. Population relaxation is triggered by the combined effects of electron-LO-phonon strong coupling, leading to the polaron formation, and phonon anharmonicity. A good agreement is found between the modelling and temperature dependence of the four wave mixing signal measured in recent experiments.