Transition metal dichalcogenides (TMDs) have attracted vast interest as layered semiconductors with high electrical and optical properties. Among them, monolayer MoS2 is a direct gap semiconductor with its gap energy in the visible range (Fig. 1(a)). Interestingly, excitonic states in monolayer MoS2 are stabilized owing to the intrinsic two-dimensional nature, and the binding energy reaches several hundred meV.

© 2017 Japan Society of Applied Physics, Optical Society of America

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