2019/08/31 by Mateusz Król, M. Król, Katarzyna Rechcińska +22
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Atomic physics #Band gap #Condensed matter physics #Dielectric #Exciton #Laser #Laser linewidth #Materials science #Monolayer #Nanotechnology #Optics #Optoelectronics #Oscillator strength #Photon #Physics #Planar #Plasmonic and Surface Plasmon Research #Polariton #Resonance (particle physics) #Resonator #Spectral line #Strong Light-Matter Interactions #Whispering-gallery wave #cond-mat.mes-hall
paper · pdf · doi:10.1088/2053-1583/ab4b14
published as 2D Materials 7, 015006 (2020)
openalex created_date 2019/08/22 · arxiv created 2019/09/29 · openalex publication_date 2019/10/04 · arxiv updated 2019/10/24 · openalex updated_date 2026/08/05
Abstract 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.