20 Citations (Scopus)

Abstract

The dynamics of electron and nuclear spin polarization in an ensemble of singly negatively charged quantum dots subject to optical excitation is theoretically studied using a graded box model, in which the electron density is approximated by a sequence of steps. The model is numerically implemented for a limited number of nuclei up to N=192 with spins I=1/2 or I=3/2. The polarization dynamics is found to depend strongly on the polarized excitation protocol. For excitation by periodic laser pulses, the electron-nuclear spin dynamics evolves coherently and gives rise to a recurrence effect in the electron spin dynamics as well as to a decelerated nuclear polarization. The validity of the model is justified by comparison with experimental data on the electron spin polarization in In,GaAs/GaAs quantum dots.
Original languageUndefined
Pages (from-to)125318_1-6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number12
DOIs
Publication statusPublished - 2009

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