Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules

Details Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules

2010-03-12

arxiv.org/abs/1003.2535v2

Phys. Rev. B 81, 245312 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 10 figures; moderately modified, some new dscussion (including 1 new figure)

Scientific paper

10.1103/PhysRevB.81.245312

We study theoretically phonon-assisted relaxation processes in a system consisting of one or two electrons confined in two vertically stacked self-assembled quantum dots. The calculation is based on a k.p approximation for single particle wave functions in a strained self-assembled structure. From these, two-particle states are calculated by including the Coulomb interaction and the transition rates between the lowest energy eigenstates are derived. We take into account phonon couplings via deformation potential and piezoelectric interaction and show that they both can play a dominant role in different parameter regimes. Within the Fermi golden rule approximation, we calculate the relaxation rates between the lowest energy eigenstates which lead to thermalization on a picosecond time scale in a narrow range of dot sizes.

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