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We apply a microscopic theory of exciton-polaritons in cavity-confinedmonolayer transition-metal dichalcogenides including both optical polarizationsin the monolayer plane, allowing to describe how chiral cavity photons interactwith the valley degrees of freedom of the active material. Upon polaritonformation, the degenerate excitons inhabiting the two inequivalent valleys areshown to assume bonding and antibonding superpositions as a result ofcavity-mediated intravalley interactions combined with intervalley Coulombinteractions. This is representative of a polariton-induced coherent mixing ofthe valley polarization. In combination with disorder, this mixing is prone toopen a new valley relaxation channel which attains significance with increasingcavity coupling. Importantly, we show that optical cavities with an asymmetricreflectance of left- and right-handed circularly-polarized photons offer aconsiderably more robust platform to realize a conserved valley polarization,as the valley localization of excitons is reinstated by an asymmetric Rabisplitting which lifts their degeneracy. Moreover, we show this degeneracylifting to allow for wavelength-selective access to the valley pseudospin bymeans of a polariton-induced chiral Stark effect, offering interestingopportunities for valleytronic applications.

physical review. b./physical review. b

Microscopic theory of cavity-confined monolayer semiconductors:  polariton-induced valley relaxation and the prospect of enhancing and  controlling the valley pseudospin by chiral strong coupling