摘要
The discovery of graphene in 2004 opens up the research in two-dimensional(2D)atomically thin materials[1].Graphene has extremely high mobility of 200000 cm2/(V s),yet the lack of bandgap compromises its potential applications in electronics and photonics.This has motivated scientists to search for 2D semiconductors beyond graphene,with atomically thin channel and a tunable bandgap[2].One example is transition-metal dichalcogenides(TMDs)with a general formula of MX2,where M is transition-metal
The discovery of graphene in 2004 opens up the research in two-dimensional（2D）atomically thin materials[1].Graphene has extremely high mobility of 200000 cm2/（V s）,yet the lack of bandgap compromises its potential applications in electronics and photonics.This has motivated scientists to search for 2D semiconductors beyond graphene,with atomically thin channel and a tunable bandgap[2].One example is transition-metal dichalcogenides（TMDs）with a general formula of MX2,
