期刊
ACS NANO
卷 14, 期 7, 页码 8299-8306出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c02072
关键词
one-dimensional mirror-twin boundaries; charge density wave; atomic-scale structures; lattice distortion; Peierls-type; transition-metal dichalcogenides
类别
资金
- National Natural Science Foundation of China (NSFC) [11574395]
- Natural Science Foundation of Hunan Province [2020JJ4659]
- National University of Defense Technology [ZK18-03-38]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201904]
- NSFC [11604366, 11634007]
- Natural Science Foundation of Jiangsu Province [BK 20160397]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2017370]
One-dimensional (1D) metallic mirror-twin boundaries (MTBs) in monolayer transition-metal dichalcogenides exhibit a periodic charge modulation and provide an ideal platform for exploring collective electron behavior in the confined system. The underlying mechanism of the charge modulation and how the electrons travel in 1D structures remain controversial. Here, for the first time, we observed atomic-scale structures of the charge distribution within one period in MTB of monolayer MoTe2 by using scanning tunneling microscopy/spectroscopy. The coexisting apparent periodic lattice distortions and U-shaped energy gap clearly demonstrate a Peierls-type charge density wave (CDW). Equidistant quantized energy levels with varied periodicity are further discovered outside the CDW gap along the metallic MTB. Density functional theory calculations are in good agreement with the gapped electronic structures and reveal that they originate mainly from a Mo 4d orbital. Our work presents hallmark evidence of the 1D Peierls-type CDW on the metallic MTBs and offers opportunities to study the underlying physics of 1D charge modulation.
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