单层
材料科学
凝聚态物理
双层
半金属
双层石墨烯
剥脱关节
纳米技术
化学物理
石墨烯
光电子学
带隙
物理
化学
生物化学
膜
作者
Fang Yuan,Yanyu Jia,Guangming Cheng,Ratnadwip Singha,Shiming Lei,Nan Yao,Sanfeng Wu,Leslie M. Schoop
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-07-21
卷期号:23 (15): 6868-6874
被引量:2
标识
DOI:10.1021/acs.nanolett.3c01175
摘要
Bulk Td-WTe2 is a semimetal, while its monolayer counterpart is a two-dimensional (2D) topological insulator. Recently, electronic transport resembling a Luttinger liquid state was found in twisted-bilayer WTe2 (tWTe2) with a twist angle of ∼5°. Despite the strong interest in 2D WTe2 systems, little experimental information is available about their intrinsic microstructure, leaving obstacles in modeling their physical properties. The monolayer, and consequently tWTe2, are highly air-sensitive, and therefore, probing their atomic structures is difficult. In this study, we develop a robust method for atomic-resolution visualization of monolayers and tWTe2 obtained through mechanical exfoliation and fabrication. We confirm the high crystalline quality of mechanically exfoliated WTe2 samples and observe that tWTe2 with twist angles of ∼5 and ∼2° retains its pristine moiré structure without substantial deformations or reconstructions. The results provide a structural foundation for future electronic modeling of monolayer and tWTe2 moiré lattices.
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