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Förg, Michael; Colombier, Leo; Patel, Robin K.; Lindlau, Jessica; Mohite, Aditya D.; Yamaguchi, Hisato; Glazov, Mikhail M.; Hunger, David; Högele, Alexander (2019): Cavity-control of interlayer excitons in van der Waals heterostructures. In: Nature Communications, Vol. 10, 3697
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Abstract

Monolayer transition metal dichalcogenides integrated in optical microcavities host exciton-polaritons as a hallmark of the strong light-matter coupling regime. Analogous concepts for hybrid light-matter systems employing spatially indirect excitons with a permanent electric dipole moment in heterobilayer crystals promise realizations of exciton-polariton gases and condensates with inherent dipolar interactions. Here, we implement cavity-control of interlayer excitons in vertical MoSe2-WSe2 heterostructures. Our experiments demonstrate the Purcell effect for heterobilayer emission in cavity-modified photonic environments, and quantify the light-matter coupling strength of interlayer excitons. The results will facilitate further developments of dipolar exciton-polariton gases and condensates in hybrid cavity - van der Waals heterostructure systems.