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Monolayer transition-metal dichalcogenides (TMDs) have recently emerged as fascinating novel materials. Like graphene, they can easily be exfoliated from bulk crystals. Unlike graphene, they have a large and direct band gap, making them attractive for potential applications in electronics or optoelectronics. They may also allow for novel device functionalities, as the spin and valley pseudospin degrees...
Transition metal dichalcogenides (TMDs) are anisotropic materials crystallizing in a graphite-like structure, with each layer consisting of an hexagonal plane of transition metal atoms sandwiched between two hexagonal planes of chalcogen atoms. The weak interlayer Van der Waals bonds can be broken to isolate stable two-dimensional (2D) crystals. A wide variety of techniques have been developed to...
We report ultrafast pump-probe measurements on a graphene/MoS2 heterostructure and demonstrate sub picosecond exciton dissociation and charge transfer from MoS2 to graphene, one order of magnitude faster than in type II two-dimensional heterostructures [1]. The process can be controlled by applying an external gate and shifting the Fermi level of graphene. For pump-probe measurements we excite the...
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