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

TL;DR

This study investigates how charge carrier tunneling affects exciton recombination dynamics in single lateral quantum dot molecules, highlighting the role of electric fields and Coulomb interactions in controlling these processes.

Contribution

It introduces a rate equation model to analyze charge transfer mechanisms, emphasizing phonon-mediated tunneling as a key factor in exciton decay.

Findings

Electric field influences tunneling and exciton character.

Phonon-mediated tunneling dominates non-radiative decay.

Tuning Coulomb energies alters charge transfer dynamics.

Abstract

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.