Excitons in two-dimensional van der Waals heterostructures
Hao Liu, Yixin Zong, Pan Wang, Hongyu Wen, Haibin Wu, Jian‐Bai Xia, Zhongming Wei
Abstract
Abstract Excitons in van der Waals (vdW) heterostructures exhibit multiple excellent characteristics which in recent years have attracted researchers to make an in-depth exploration. In this review, we briefly introduce vdW heterostructures based on monolayer transition metal dichalcogenides and the emerging exciton characteristics in them, especially the formation of interlayer excitons. Then, we summarize the main results of a recent study about excitons in vdW heterostructures, including a Bose–Einstein condensate state, moiré excitons, and the complex exciton dynamics. The applications of excitons in vdW heterostructures are also mentioned, particularly the valley devices, which have a promising outlook. Finally, we point out some problems that exist at present, and give some future research directions.