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Exciton-polaritons in multilayer WSe₂ in a planar microcavity

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arxiv 1908.05300 v2 pith:PLP67RYF submitted 2019-08-14 cond-mat.mes-hall

Exciton-polaritons in multilayer WSe₂ in a planar microcavity

classification cond-mat.mes-hall
keywords cavityflakesstrengthcouplingenergyexcitonsfew-layeroscillator
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe$_2$ flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe$_2$, as well as in few-layer WSe$_2$ flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.

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