Why do two-dimensional exciton-polaritons interact? The exciton-polariton quasiparticle is part light (photon), and part matter (exciton). Their excitonic (matter) part confers them the ability to interact with other particles, a property lacking to bare photons.
source https://phys.org/news/2020-12-interactions-strong-light-matter-coupling.html
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