Phonon-Induced Exciton Dephasing in Quantum Dot Molecules

E. A. Muljarov, T. Takagahara, and R. Zimmermann
Phys. Rev. Lett. 95, 177405 – Published 21 October 2005

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.

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  • Received 5 May 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.177405

©2005 American Physical Society

Authors & Affiliations

E. A. Muljarov1,2,3,*, T. Takagahara2, and R. Zimmermann1

  • 1Institut für Physik der Humboldt-Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany
  • 2Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
  • 3General Physics Institute, Russian Academy of Sciences, Vavilova 38, Moscow 119991, Russia

  • *Electronic address: muljarov@gpi.ru

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Vol. 95, Iss. 17 — 21 October 2005

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