刘艳平

Observation of split defect-bound excitons in twisted WSe2/WSe2 homostructure

发布时间：2020-10-12

点击次数：

影响因子：3.97

发表刊物：Appl. Phys. Lett.

摘要：The excitonic effects in two-dimensional transition metal dichalcogenides and their heterostructures have been extensively investigated. Significantly, the moiré excitons, induced by a moiré superlattice in a twisted heterostructure, have triggered tremendous attention, demonstrating the practicability of artificial excitonic crystals. Besides, recent works have shown that the excitonic states in homostructures also exhibit novel properties worthy of further development. Here, we present a tear-and-stack technique for fabricating a regular or a twisted homostructure. Such a strategy was utilized to reassemble a monolayer WSe2 into a twisted homostructure, and various excitons from this structure have been identified in the photoluminescence spectra. Interestingly, the unusual equidistant splitting was first observed in the defect-bound excitons. It is believed that this phenomenon is attributed to the various defect states and the local stacking patterns. This interpretation is supported by theoretical calculations, which show the dependence of the energy band structure on different defect states and local stacking patterns. These unconventional defect-bound excitons are key building blocks in the research of homostructures that highlight the feasibility of artificially manipulating local excitons for practical applications.

论文类型：期刊论文

通讯作者：Cheng Zeng, Jiahong Zhong, Yun-Peng Wang, Juan Yu, Lingkai Cao, Ziliang Zhao, Junnan Ding, Chunxiao Cong, Xiaofei Yue, Zongwen Liu, and YP. Liu(刘艳平) *

文献类型：J

卷号：117

页面范围：153103

是否译文：否

发表时间：2020-10-12

收录刊物：SCI

发布期刊链接：https://aip.scitation.org/doi/10.1063/5.0015431

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