Cavity-control of interlayer excitons in van der Waals heterostructures

• Published in: Nature communications Vol. 10; no. 1; pp. 3697 - 6
• Main Authors: Förg, Michael, Colombier, Léo, Patel, Robin K., Lindlau, Jessica, Mohite, Aditya D., Yamaguchi, Hisato, Glazov, Mikhail M., Hunger, David, Högele, Alexander
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 16.08.2019; Nature Publishing Group; Nature Portfolio
• Subjects: 639/766/119/1000/1018; 639/925/357/1018; Chemical vapor deposition; Condensates; Coupling; Crystals; Dipole moments; Electric dipoles; Excitons; Gases; Heterostructures; Humanities and Social Sciences; Hybrid systems; Interlayers; Laboratories; Light; Microcavities; multidisciplinary; Photonics; Polaritons; Science; Science (multidisciplinary); Spectrum analysis; Transition metal compounds
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-019-11620-z

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 MoSe 2 -WSe 2 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. Cavity-enhanced light-matter interaction in the weak-coupling regime is known to result in Purcell enhancement. Here the authors demonstrate Purcell enhancement in the photoluminescence of vertical MoSe 2 -WSe 2 heterostructures coupled to a micro-cavity and determine the light-matter coupling strength for interlayer excitons.