Phonon-assisted decoherence and tunneling in quantum dot molecules

Details Phonon-assisted decoherence and tunneling in quantum dot molecules Phonon-assisted decoherence and tunneling in quantum dot molecules

2010-11-12

arxiv.org/abs/1011.2857v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, conference proceeding NOEKS10, to be published in Phys. Stat. Sol

Scientific paper

We study the influence of the phonon environment on the electron dynamics in a doped quantum dot molecule. A non-perturbative quantum kinetic theory based on correlation expansion is used in order to describe both diagonal and off-diagonal electron-phonon couplings representing real and virtual processes with relevant acoustic phonons. We show that the relaxation is dominated by phonon-assisted electron tunneling between constituent quantum dots and occurs on a picosecond time scale. The dependence of the time evolution of the quantum dot occupation probabilities on the energy mismatch between the quantum dots is studied in detail.

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