Phonon-induced exciton dephasing in quantum dot molecules

E. A. Muljarov, T. Takagahara, R. Zimmermann

Research output: Contribution to journalArticle

59 Citations (Scopus)

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.

Original languageEnglish
Article number177405
JournalPhysical Review Letters
Volume95
Issue number17
DOIs
Publication statusPublished - 2005 Oct 21
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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