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.
Highlights
Semiconductor transition metal dichalcogenides (TMDs) exhibit remarkable optoelectronic and valleytronic properties in the limit of direct band-gap MLs [1,2,3,4]
Our experiments quantify the strength of light-matter coupling for both zero and finite momentum excitons residing in Moiré 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
Summary
Mismatch (symbolized by the arrows in Fig. 1a) in HBL systems built from dissimilar ML crystals. The latter, on the other hand, contribute to the PL spectrum as phonon sidebands [25, 26] downshifted from IX by the energy of acoustic or optical phonons ( Ωac or Ωop) that compensate for momentum-mismatch in the light-matter coupling and enable radiative decay of momentum-dark excitons Both the zero phonon line (ZPL) of momentumbright excitons IX and the phonon sidebands of momentumdark excitons IXK contribute to the intense red-most peak around 1.4 eV in the PL spectra of our as-grown and mirrortransferred MoSe2-WSe2 HBLs shown in Fig. 1c and d, respectively. The best approximation to the total HBL peak was ob-
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