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Theoretical study establishes linear response theory for cavity-coupled materials across all coupling regimes, providing a universal framework for analyzing collective quantum systems.
The authors develop a linear response theory for materials collectively coupled to a cavity that is valid in all regimes of light-matter coupling, including symmetry-broken phases. The response functions for the cavity and the material are obtained in terms of the respective bare responses. The theory is formulated for a general model which encompasses most of the systems typically considered in the field of cavity QED materials. It is then applied to several specific models.
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Román-Roche et al. (2025) studied this question.
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