Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity. (arXiv:1809.09571v1 [cond-mat.mes-hall])

//Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity. (arXiv:1809.09571v1 [cond-mat.mes-hall])

Monolayer transition metal dichalcogenides, known for exhibiting strong excitonic resonances, constitute a very interesting and versatile platform for investigation of light-matter interactions. In this work we report on a strong coupling regime between excitons in monolayer WSe2 and photons confined in an open, voltage-tunable dielectric microcavity. The tunability of our system allows us to extend the exciton-polariton state over a wide energy range and, in particular, to bring the excitonic component of the lower polariton mode into resonance with other excitonic transitions in monolayer WSe2. With selective excitation of spin-polarized exciton-polaritons we demonstrate the valley polarization when the polaritons from the lower branch come into resonance with a bright trion state in monolayer WSe2 and valley depolarization when they are in resonance with a dark trion state.

Published : "arXiv Mesoscale and Nanoscale Physics".

2018-09-26T04:30:17+00:00September 26th, 2018|Categories: Publications|Tags: , |
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