激子
单层
激发
异质结
凝聚态物理
过渡金属
范德瓦尔斯力
双层
比克西顿
材料科学
超短脉冲
化学
物理
激光器
纳米技术
光学
生物化学
有机化学
量子力学
膜
分子
催化作用
作者
Shuwen Zheng,Hai-Yu Wang,Hai Wang,Lei Wang
标识
DOI:10.1021/acs.jpclett.3c02545
摘要
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) are ideal platforms for exploring excitonic physics because of the tightly bound excitons. In this work, we observed the onset of band-edge exciton formation in monolayer MoS2 (WS2) and bilayer MoS2–WS2 by measuring the transient optical response upon excitation with ultrashort laser pulses. In addition to wavelength dependence on excitation under nonresonant excitation, we found that the onset of band-edge exciton formation in monolayer MoS2 (WS2) pumped in the exciton state is significantly faster than that with pumping in the nonexciton state, which could be attributed to the effective transition between exciton states induced by the excitonic effect. Besides, the onset of band-edge exciton formation in van der Waals heterostructures is similar to that for monolayer TMDCs regardless of charge transfer at the interface. Our work contributes to a better understanding of exciton dynamics in 2D TMDCs, providing a solid basis of the rational design of the 2D optoelectronic applications based on TMDCs.
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