The discovery of graphene heralded an era of intense research on two dimensional (2D) materials 1 . 2D transiton metal dichalcogenides TX 2 (T=Mo, W, Nb, Ti; X=S, Se, Te) provide an ideal system for studying many-body interactions, which manifest strongly in 2D systems due to the enhancement of Coulomb interactions and reduced screening 2 . Since 2D materials exhibit very large surface area and low carrier density,
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