  We investigate the interaction between a monolayer of WS2 and a chiral
plasmonic metasurface. WS2 possesses valley excitons that selectively couple
with one-handed circularly polarised light. At the same time, the chiral
plasmonic metasurface exhibits spin-momentum locking, leading to a robust
polarisation response in the far field. Using a scattering formalism based on
the coupled mode method, we analyse various optical properties of the WS2
monolayer. Specifically, we demonstrate the generation of circular dichroism in
the transition metal dichalcogenide (TMD) by harnessing the excitation of
surface plasmon polaritons (SPPs) in the metasurface. Moreover, we observe the
emergence of other guided modes, opening up exciting possibilities for further
exploration in TMD-based devices.
