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The dielectric environment of atomically-thin monolayer (ML) ofsemiconducting transition metal dichalcogenides affects both the electronicband gap and the excitonic binding energy in the ML. We investigate the effectof the environment on the in-plane magnetic field brightening of neutral andcharged dark exciton emissions in the WSe$_2$ ML. The monolayers placed inthree dielectric environments are studied, in particular, the ML encapsulatedin hexagonal BN (hBN) flakes, the ML deposited on a hBN layer, and the MLembedded between the hBN flake and SiO$_2$/Si substrate. We observe that thebrightening rates of the neutral and charged dark excitons depend on thedielectric environment, which may be related to the variation of the level ofcarrier concentration in the ML. Moreover, the surrounding media, characterizedby different dielectric constants, influences weakly the relative energies ofthe neutral and charged dark excitons in reference to the bright ones.

The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe$_2$ monolayer