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

Source: Phys. Rev. B 80, 125318 (2009); doi:10.1103/PhysRevB.80.125318

Published 17 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 72.25.Fe
    Optical creation of spin polarized carriers
  • 03.67.Pp
    Quantum error correction and other methods for protection against decoherence
  • 71.70.Jp
    Nuclear states and interactions (condensed matter)
  • 78.67.Hc
    Optical properties of quantum dots
  • YEAR: 2009
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PUBLICATION DATA
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M. Yu. Petrov,1 G. G. Kozlov,1 I. V. Ignatiev,1,2 R. V. Cherbunin,1,2 D. R. Yakovlev,2,3 and M. Bayer2
1Physics Department, St. Petersburg State University, St. Petersburg 198504, Russia
2Experimentelle Physik 2, Technische Universität Dortmund, D-44227 Dortmund, Germany
3A. F. Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia
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,Ga)As/GaAs quantum dots. ©2009 The American Physical Society
History: Received 27 April 2009; revised 14 August 2009; published 17 September 2009
Permalink: http://link.aps.org/abstract/PRB/v80/e125318

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