Coupled electron-nuclear spin dynamics in quantum dots: A graded box model approach

Результат исследований: Научные публикации в периодических изданияхстатья

20 Цитирования (Scopus)

Аннотация

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.
Язык оригиналане определен
Страницы (с-по)125318_1-6
ЖурналPhysical Review B - Condensed Matter and Materials Physics
Том80
Номер выпуска12
DOI
СостояниеОпубликовано - 2009

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