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Monolayer transition metal dichalcogenides, known for exhibiting strongexcitonic resonances, constitute a very interesting and versatile platform forinvestigation of light-matter interactions. In this work we report on a strongcoupling regime between excitons in monolayer WSe2 and photons confined in anopen, voltage-tunable dielectric microcavity. The tunability of our systemallows us to extend the exciton-polariton state over a wide energy range and,in particular, to bring the excitonic component of the lower polariton modeinto resonance with other excitonic transitions in monolayer WSe2. Withselective excitation of spin-polarized exciton-polaritons we demonstrate thevalley polarization when the polaritons from the lower branch come intoresonance with a bright trion state in monolayer WSe2 and valley depolarizationwhen they are in resonance with a dark trion state.

Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity