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

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