LO Phonon-Induced Exciton Dephasing in Quantum Dots: An Exactly Solvable Model

Details LO Phonon-Induced Exciton Dephasing in Quantum Dots: An Exactly Solvable Model LO Phonon-Induced Exciton Dephasing in Quantum Dots: An Exactly Solvable Model

2006-05-23

arxiv.org/abs/cond-mat/0605545v1

Phys. Rev. Lett. 98, 187401 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.187401

It is widely believed that, due to its discrete nature, excitonic states in a quantum dot coupled to dispersionless 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.

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