Combining the microscopic calculation of superlattice minibands and macroscopic real density matrix approach, one can obtain electric susceptibilities of the superlattice system irradiated by an electromagnetic wave. It is shown how to calculate the dispersion relation, excitonic resonance positions, and susceptibility of a Cu₂O/MgO-based superlattice (SL), when Rydberg exciton polaritons appear, including the effect of the coherence between the electron-hole pair and the electromagnetic field and the polaritonic effect. Using the Kronig-Penney model for computing miniband SL parameters, analytical expressions for optical functions are obtained and numerical calculations for a Cu₂O/MgO SL are performed.
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Ziemkiewicz et al. (2024) studied this question.
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