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arXiv · 1710.00990

Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures

Michael Förg·Léo Colombier·Robin K. Patel·Jessica Lindlau·Aditya D. Mohite·Hisato Yamaguchi·David Hunger·Alexander Högele
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Abstract

Monolayer (ML) transition metal dichalcogenides (TMDs) 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 (HBL) crystals promise realizations of exciton-polariton gases and condensates with immanent dipolar interactions. Here, we identify optical signatures of spatially indirect momentum-bright and momentum-dark interlayer excitons in vertical MoSe$_2$-WSe$_2$ heterostructures and implement cavity-control of both exciton manifolds. Our experiments quantify the strength of light-matter coupling for both zero and finite momentum excitons residing in Moir\'{e} superlattices of TMD HBLs and demonstrate that both exciton species are susceptible to Purcell enhancement in cavity-modified photonic environments. Our results form the basis for further developments of dipolar exciton-polariton gases and condensates in hybrid cavity -- van der Waals heterostructure systems.

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Michael Förg, Léo Colombier, Robin K. Patel, Jessica Lindlau, Aditya D. Mohite, Hisato Yamaguchi, David Hunger, Alexander Högele. 2017-10-03. Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures. https://doi.org/10.1038/s41467-019-11620-z

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