Coherent Coupling of WS_2 Monolayers with Metallic Photonic   Nanostructures at Room Temperature
  Room temperature strong coupling of WS_2 monolayer exciton transitions to metallic Fabry-Perot and plasmonic optical cavities is demonstrated. A Rabi splitting of 101 meV is observed for the Fabry-Perot cavity, more than double those reported to date in other 2D materials. The enhanced magnitude and visibility of WS_2 monolayer strong coupling is attributed to the larger absorption coefficient, the narrower linewidth of the A exciton transition, and greater spin-orbit coupling. For WS_2 coupled to plasmonic arrays, the Rabi splitting still reaches 60 meV despite the less favorable coupling conditions, and displays interesting photoluminescence features. The unambiguous signature of WS_2 monolayer strong coupling in easily fabricated metallic resonators at room temperature suggests many possibilities for combining light-matter hybridization with spin and valleytronics. 
S. Wang, S. Li, T. Chervy, A. Shalabney, S. Azzini, E. Orgiu, J. A.   Hutchison, C. Genet, P. Samori, T. W. Ebbesen
cond-mat.mtrl-sci cond-mat.mes-hall