TY - JOUR
T1 - Phonon-induced exciton dephasing in quantum dot molecules
AU - Muljarov, E. A.
AU - Takagahara, T.
AU - Zimmermann, R.
PY - 2005/10/21
Y1 - 2005/10/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=28944442737&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=28944442737&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.95.177405
DO - 10.1103/PhysRevLett.95.177405
M3 - Article
AN - SCOPUS:28944442737
SN - 0031-9007
VL - 95
JO - Physical Review Letters
JF - Physical Review Letters
IS - 17
M1 - 177405
ER -