Exciton Kinetics Within Two Interacting Quantum Dots Featuring the A-Type Blinking—Kinetic Monte Carlo Approach for Coupled QDs Simulations

Since the first reports of quantum dot (QD) based quasi-molecules formed by near-field-coupled QDs, how to design and apply such systems in the field of quantum information processing are still in learning process. Experimentally, single-particle spectroscopy is the method of choice for studying kinetic processes in such structures. However, current efforts focus on detecting all the photons emitted by the quasi-molecule, making it difficult to understand the precise changes occurring in each of the coupled QDs. In this study, a different approach is implemented by adapting the kinetic Monte Carlo algorithms to gain comprehensive insights into the temporal evolution of each coupled QD. This encompasses not only photon emission events, but also the full range of kinetic processes, including exciton transfer between the QDs. It is, therefore, important to gain insight into the adaptation pathways caused by exciton exchange between near-field coupled QDs. The attention is strict to a system of two interacting QDs in different coupling regimes. The results point to new mechanisms of sequential/cascade excitonic relaxation, which are not typical for a QD in an isolated state. For this reason, the methodology presented here seems to be significant and complementary to the experimental approach.