Introduction . In the field of quantum information technologies, precision metrology, and imaging applications, 2D materials with semiconducting properties have emerged as a new class of optical sources offering the potential for high photon yield, excellent spectral purity, and controllable emission of coherent photons1 , 2 , 3 , 4 , 5. Among them, monolayers (MLs) of WS 2 , a transition-metal dichalcogenide (TMD), stand out as particularly appealing, thanks to their sem...