Resumen: We analyze the properties of strongly coupled excitons and photons in systems made of semiconducting two-dimensional transition-metal dichalcogenides embedded in optical cavities. Through a detailed microscopic analysis of the coupling, we unveil novel, highly tunable features of the spectrum that result in polariton splitting and a breaking of light-matter selection rules. The dynamics of the composite polaritons is influenced by the Berry phase arising both from their constituents and from the confinement-enhanced coupling. We find that light-matter coupling emerges as a mechanism that enhances the Berry phase of polaritons well beyond that of its elementary constituents, paving the way to achieve a polariton anomalous Hall effect. Idioma: Inglés DOI: 10.1103/PhysRevLett.121.137402 Año: 2018 Publicado en: Physical Review Letters 121, 13 (2018), 137402 [6 pp] ISSN: 0031-9007 Factor impacto JCR: 9.227 (2018) Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 6 / 81 = 0.074 (2018) - Q1 - T1 Factor impacto SCIMAGO: 3.571 - Physics and Astronomy (miscellaneous) (Q1)