Coupled-channel approach to scattering of hybrid excitons

Le résumé fourni par la source

We consider the interactions of hybrid excitons in a two-dimensional semiconductor bilayer, where spatially direct and indirect excitons are hybridized by interlayer charge-carrier tunneling. Starting from a microscopic electron-hole description, we construct realistic pseudopotentials for exciton-exciton interactions and use them as inputs to a coupled-channel scattering integral equation. This enables non-perturbative calculations of hybrid-exciton scattering beyond standard perturbative theories, and highlights the importance of energy-dependent scattering and channel mixing. In particular, we show that the interaction strength of hybrid excitons exhibits a rapid growth with increasing energy, which we find is inherited from their indirect-exciton component. We further demonstrate that dielectric screening affects the direct and indirect channels in distinct ways, leading to markedly different interaction strengths across experimentally relevant dielectric environments. Finally, we show that the hybrid-exciton scattering strength can be electrically tuned via the Stark shift, which controls the direct-indirect detuning and hence the hybridization of the two exciton modes.

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