Theory of phonon-mediated relaxation in doped quantum dot molecules
arXiv:0912.1181 · doi:10.1103/PhysRevB.81.115305
Abstract
A quantum dot molecule doped with a single electron in the presence of diagonal and off-diagonal carrier-phonon couplings is studied by means of a non-perturbative quantum kinetic theory. The interaction with acoustic phonons by deformation potential and piezoelectric coupling is taken into account. We show that the phonon-mediated relaxation is fast on a picosecond timescale and is dominated by the usually neglected off-diagonal coupling to the lattice degrees of freedom leading to phonon-assisted electron tunneling. We show that in the parameter regime of current electrical and optical experiments, the microscopic non-Markovian theory has to be employed.
Final extended version, 5 pages, 4 figures
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- Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules
- Full counting statistics of the photocurrent through a double quantum dot embedded in a driven microwave resonator
- Phonon-assisted relaxation between hole states in quantum dot molecules
- Phonon effects on the radiative recombination of excitons in double quantum dots
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- Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules