Electronic states of domain walls in commensurate charge density wave ground state and mosaic phase in 1T-TaS2
Yan Li(李彦)1,2, Yao Xiao(肖遥)1,2, Qi Zheng(郑琦)1,2, Xiao Lin(林晓)2,†, Li Huang(黄立)1,2,‡, and Hong-Jun Gao(高鸿钧)1,2
1 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100490, China
Abstract Domain walls (DWs) in the charge-density-wave (CDW) Mott insulator 1T-TaS2 have unique localized states, which play an important role in exploring the electronic properties of the material. However, the electronic states in DWs in 1T-TaS2 have not been clearly understood, mostly due to the complex structures, phases, and interlayer stacking orders in the DW areas. Here, we explored the electronic states of DWs in the large-area CDW phase and mosaic phase of 1T-TaS2 by scanning tunneling spectroscopy. Due to the different densities of DWs, the electronic states of DWs show distinct features in these phases. In the large area CDW phase, both the domain and the DWs (DW1, DW2, DW4) have zero conductance at the Fermi level; while in the mosaic phase, they can be metallic or insulating depending on their environments. In areas with a high density of DWs, some electronic states were observed both on the DWs and within the domains, indicating delocalized states over the whole region. Our work contributes to further understanding of the interplay between CDW and electron correlations in 1T-TaS2.
Fund: Project supported by the National Key Research and Development Project of China (Grant No. 2019YFA0308500), the National Natural Science Foundation of China (Grant No. 61888102), and the Chinese Academy of Sciences (Grant Nos. XDB30000000 and YSBR-003).
Corresponding Authors:
Xiao Lin, Li Huang
E-mail: xlin@ucas.ac.cn;lhuang@iphy.ac.cn
Cite this article:
Yan Li(李彦), Yao Xiao(肖遥), Qi Zheng(郑琦), Xiao Lin(林晓), Li Huang(黄立), and Hong-Jun Gao(高鸿钧) Electronic states of domain walls in commensurate charge density wave ground state and mosaic phase in 1T-TaS2 2023 Chin. Phys. B 32 077101
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