Abstract: 

We present a many-body theory for the study of strong interaction effects between exciton-polariton created in a 2D microcavity semiconductors and coupled to a reservoir, either a BEC of polaritons with opposing spin or an electron gas. The resulting quasiparticles, the so-called Bose and Fermi polaron-polaritons, give rise to a plethora of tunable effects, such as Feshbach physics, bound states and mediated interactions.

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