Fig. 2: Temperature dependent cavity coupling to excited-state excitons.
From: Enhanced nonlinear interaction of polaritons via excitonic Rydberg states in monolayer WSe2
a–c Angle resolved reflection at different temperatures of 140, 77, and 15 K. The dashed lines indicate the bare cavity and exciton dispersions, while the solid lines correspond to the resulting dispersion relations of the two polaritons induced by the strong coupling between the excitons and the cavity photons. d Line cut from the 15 K data between \({9}^{^\circ }\) and \({18}^{^\circ }\). Those data have y axis offset for clarity. A clear anti-crossing is observed (red trend lines). The extracted Rabi splitting is 7.7 meV. The dashed line shows the 2 s exciton energy at 1.848 eV.
