Phonon-assisted decoherence and tunneling in quantum dot molecules

TY - JOUR

T1 - Phonon-assisted decoherence and tunneling in quantum dot molecules

AU - Grodecka-Grad, Anna

AU - Foerstner, Jens

PY - 2011/4

Y1 - 2011/4

N2 - We study the influence of the phonon environment on the electron dynamics in a doped quantum dot molecule. A non-perturbative quantum kinetic theory based on correlation expansion is used in order to describe both diagonal and off-diagonal electron-phonon couplings representing real and virtual processes with relevant acoustic phonons. We show that the relaxation is dominated by phonon-assisted electron tunneling between constituent quantum dots and occurs on a picosecond time scale. The dependence of the time evolution of the quantum dot occupation probabilities on the energy mismatch between the quantum dots is studied in detail.

AB - We study the influence of the phonon environment on the electron dynamics in a doped quantum dot molecule. A non-perturbative quantum kinetic theory based on correlation expansion is used in order to describe both diagonal and off-diagonal electron-phonon couplings representing real and virtual processes with relevant acoustic phonons. We show that the relaxation is dominated by phonon-assisted electron tunneling between constituent quantum dots and occurs on a picosecond time scale. The dependence of the time evolution of the quantum dot occupation probabilities on the energy mismatch between the quantum dots is studied in detail.

U2 - 10.1002/pssc.201000824

DO - 10.1002/pssc.201000824

M3 - Journal article

SN - 1862-6351

VL - 8

SP - 1125

EP - 1128

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

JF - Physica Status Solidi (C) Current Topics in Solid State Physics

IS - 1

ER -