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The valley degree of freedom is one of the most intriguing properties ofatomically thin transition metal dichalcogenides. Together with the possibilityto address this degree of freedom by valley-contrasting optical selectionrules, it has the potential to enable a completely new class of futureelectronic and optoelectronic devices. Resonant optical nanostructures emergeas promising tools for controlling the valley degree of freedom at thenanoscale. However, a critical understanding gap remains in how nanostructuresand their nearfields affect the polarization properties of valley-selectivechiral emission hindering further developments in this field. In order toaddress this issue, our study delves into the experimental investigation of ahybrid model system where valley-specific chiral emission from monolayermolybdenum disulfide is interacting with a resonant plasmonic nanosphere.Contrary to the intuition suggesting that a centrosymmetric nanoresonatorpreserves the degree of circular polarization in the farfield, our cryogenicphotoluminescence microscopy reveals almost complete depolarization. Werigorously study the nature of this phenomenon numerically considering themonolayer-nanoparticle interaction at different levels including excitation andemission. We find that the farfield degree of polarization strongly reduces inthe hybrid system when including excitons emitting from outside of the system'ssymmetry point, which in combination with depolarisation at the excitationlevel causes the observed effect. Our results highlight the importance ofconsidering spatially distributed chiral emitters for precise predictions ofpolarization responses in these hybrid systems. This finding advances ourfundamental knowledge of the light-valley interactions at the nanoscale butalso unveils a serious impediment of the practical fabrication of resonantvalleytronic nanostructures.

Influence of resonant plasmonic nanoparticles on optically accessing the valley degree of freedom in 2D semiconductors