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Phonon-induced exciton dephasing in quantum dot molecules

Muljarov, Egor, Takagahara, T. and Zimmermann, R. 2005. Phonon-induced exciton dephasing in quantum dot molecules. Physical Review Letters (PRL) 95 , 177405. 10.1103/PhysRevLett.95.177405

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Abstract

A new microscopic approach to the optical transitions in quantum dots and quantum dot molecules, which accounts for both diagonal and nondiagonal exciton-phonon interaction, is developed. The cumulant expansion of the linear polarization is generalized to a multilevel system and is applied to calculation of the full time dependence of the polarization and the absorption spectrum. In particular, the broadening of zero-phonon lines is evaluated directly and discussed in terms of real and virtual phonon-assisted transitions. The influence of Coulomb interaction, tunneling, and structural asymmetry on the exciton dephasing in quantum dot molecules is analyzed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 0031-9007
Last Modified: 04 Jun 2017 01:41
URI: http://orca.cf.ac.uk/id/eprint/1608

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