Exciton Dephasing in Quantum Dots due to LO-Phonon Coupling: An Exactly Solvable Model
- 1 May 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 98 (18) , 187401
- https://doi.org/10.1103/physrevlett.98.187401
Abstract
It is widely believed that, due to its discrete nature, excitonic states in a quantum dot coupled to dispersionless longitudinal-optical (LO) phonons form everlasting mixed states (exciton polarons) showing no line broadening in the spectrum. This is indeed true if the model is restricted to a limited number of excitonic states in a quantum dot. We show, however, that extending the model to a large number of states results in LO phonon-induced spectral broadening and complete decoherence of the optical response.Keywords
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