Microscopic theory of polariton-polariton interactions

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The authors develop here a microscopic theory of polariton-polariton interactions in microcavity systems, employing a00exb i00exn00exi00ext00exi00exo calculations for dipolar polaritons to build a generalized Born-Oppenheimer framework. Their theory predicts that strong light-matter coupling drastically enhances interaction strength, revealing unexpected scaling laws that can be experimentally validated. This model applies to both dipolar and non-dipolar polaritons, offering new insights and experimental strategies to explore strong polariton correlations and advance towards the realization of a polariton blockade regime.