Ultrafast carrier dynamics in two-dimensional transition metal dichalcogenides

An overall understanding of the carrier dynamics in two-dimensional transition metal dichalcogenides (TMDs) is necessary to improve the quantum efficiencies and performances of TMD-based optoelectronic devices. Many novel phenomena and interpretations of ultrafast carrier dynamics in TMD crystals have been reported in recent years; therefore, we have prepared this review for the existing reported experimental studies as a summary for researchers. This review briefly covers several typical topics involving ultrafast carrier dynamics in two-dimensional TMDs discussed so far, such as many-body effects, ultrafast nonradiative recombination, intervalley transfer of carriers, high-energy C exciton cooling, and carrier dynamics in TMD-based heterostructures. We have attempted to provide a relatively comprehensive presentation and positive guidance for studies involving carrier dynamics in two-dimensional TMDs.