Influence of the charge carrier tunneling processes on the recombination dynamics in single lateral quantum dot molecules

Details Influence of the charge carrier tunneling processes on the recombination dynamics in single lateral quantum dot molecules Influence of the charge carrier tunneling processes on the recombination dynamics in single lateral quantum dot molecules

2009-11-06

arxiv.org/abs/0911.1221v1

Phys. Rev. B 82, 085309 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.085309

We report on the charge carrier dynamics in single lateral quantum dot molecules and the effect of an applied electric field on the molecular states. Controllable electron tunneling manifests itself in a deviation from the typical excitonic decay behavior which is strongly influenced by the tuning electric field and inter-molecular Coulomb energies. A rate equation model is developed to gain more insight into the charge transfer and tunneling mechanisms. Non-resonant (phonon-mediated) electron tunneling which changes the molecular exciton character from direct to indirect, and vice versa, is found to be the dominant tunable decay mechanism of excitons besides radiative recombination.

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