Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules

A. Grodecka, P. Machnikowski, J. Förstner, Physica Status Solidi (C) 6 (2008) 474–478.

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Abstract
Phonon-assisted singlet-singlet relaxation in semiconductor quantum dot molecules is studied theoretically. Laterally coupled quantum dot structures doped with two electrons are considered. We take into account interaction with acoustic phonon modes via deformation potential and piezoelectric coupling. We show that piezoelectric mechanism for the considered system is of great importance and for some ranges of quantum dot molecule parameters is the dominant contribution to relaxation. It is shown that the phonon-assisted tunneling is much faster (down to ∼ 6 ps even at zero temperature) in comparison with other decoherence processes. The influence of Coulomb interaction is discussed and its consequences are indicated. We calculate the relaxation rates for GaAs quantum dot molecules and study the dependence on quantum dot size, distance and offset between the constituent quantum dots. In addition the temperature dependence of the tunneling rates is analyzed.
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Journal Title
physica status solidi (c)
Volume
6
Issue
2
Page
474-478
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Grodecka A, Machnikowski P, Förstner J. Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules. physica status solidi (c). 2008;6(2):474-478. doi:10.1002/pssc.200880319
Grodecka, A., Machnikowski, P., & Förstner, J. (2008). Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules. Physica Status Solidi (C), 6(2), 474–478. https://doi.org/10.1002/pssc.200880319
@article{Grodecka_Machnikowski_Förstner_2008, title={Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules}, volume={6}, DOI={10.1002/pssc.200880319}, number={2}, journal={physica status solidi (c)}, publisher={Wiley}, author={Grodecka, Anna and Machnikowski, Paweł and Förstner, Jens}, year={2008}, pages={474–478} }
Grodecka, Anna, Paweł Machnikowski, and Jens Förstner. “Theoretical Study of Phononassisted Singlet-Singlet Relaxation in Two-Electron Semiconductor Quantum Dot Molecules.” Physica Status Solidi (C) 6, no. 2 (2008): 474–78. https://doi.org/10.1002/pssc.200880319.
A. Grodecka, P. Machnikowski, and J. Förstner, “Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules,” physica status solidi (c), vol. 6, no. 2, pp. 474–478, 2008.
Grodecka, Anna, et al. “Theoretical Study of Phononassisted Singlet-Singlet Relaxation in Two-Electron Semiconductor Quantum Dot Molecules.” Physica Status Solidi (C), vol. 6, no. 2, Wiley, 2008, pp. 474–78, doi:10.1002/pssc.200880319.
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