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The rich optical properties of transition metal dichalcogenide monolayers(TMD-MLs) render these materials promising candidates for the design of newoptoelectronic devices. Despite the large number of excitonic complexes inTMD-MLs, the main focus has been put on optically bright neutral excitons.Spin-forbidden dark excitonic complexes have been addressed for basic sciencepurposes, but not for applications. We report on spin-forbidden dark excitoniccomplexes in ML WSe$_2$ as an ideal system for the facile generation ofradially polarized light beams. Furthermore, the spatially resolvedpolarization of photoluminescence beams can be exploited for basic research onexcitons in two-dimensional materials.

Radially polarized light beams from spin-forbidden dark excitons and trions in monolayer WSe$_2$