Exciton-exciton Interactions -- A Quantitative Comparison Between Complimentary Phenomenological Models
arXiv:2310.12652 · doi:10.1103/PhysRevB.109.155423
Abstract
Many-body interactions (MBIs) such as exciton-exciton interactions significantly affect the optical response of semiconductor nanostructures. These interactions can be rigorously modeled through microscopic calculations. However, these calculations can be computationally intensive and often lack physical insights. An alternative is to use phenomenological many-body interaction models such as the modified optical Bloch equations (MOBEs) and the anharmonic oscillator (AO) model. While both these models have separately been used to interpret experimental data, to the best of our knowledge, an explicit and direct correspondence between these models has not been established. Here, we show the empirical equivalence between these two complimentary MBI models through two-dimensional coherent spectroscopy simulations. A quantitative correspondence between the MBI parameters used in the two models are obtained. We also perform a quantitative comparison of these MBI models with experiments, which highlights the usefulness of these phenomenological models in interpreting experimental results.
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