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Abstract
We present a theoretical analysis of the phonon-assisted relaxation in a system composed
of two self-assembled vertically stacked quantum dots. We construct realistic model,
which takes into account the geometry and strain distribution in the system. We calculate
phonon-assisted relaxation rates between the two lowest states (in one- and two-electron
cases). The relaxation rates and energy levels are studied as a function of external
(axial) electric field and geometry of the structure (dot sizes). We show that the
relaxation times can be as low as 1~ps but efficent relaxation occurs only for very
finely tuned dots.