期刊
ACS NANO
卷 15, 期 4, 页码 7149-7154出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c00320
关键词
Nb2Six-1Te4; 1D metallic chain; 2D semiconductor; anisotropy; scanning tunneling microscopy (STM); standing waves
类别
资金
- Ministry of Science and Technology of China [2017YFA0305400]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA18010000]
- National Natural Science Foundation of China [11874264]
- ShanghaiTech University
- Singapore MOE AcRF [MOE2019-T2-1-001]
The material Nb2Six-1Te4 is characterized by spontaneously developed one-dimensional metallic chains embedded in a two-dimensional semiconductor, leading to strong transport anisotropy. This unique microscopic structure allows electron quasiparticles to form one- and two-dimensional standing waves side by side.
The ternary van der Waals material Nb2Six-1Te4 demonstrates many interesting properties as the content of Si is changed, ranging from metallic Nb3SiTe6 (x = 5/3) to narrow-gap semiconductor Nb2SiTe4 (x = 2) and with the emergence of one-dimensional Dirac fermion excitations in between. An in-depth understanding of their properties with different stoichiometry is important. Here we use scanning tunneling microscopy and spectroscopy to reveal that Nb2Six-1Te4 is a system with spontaneously developed and self-aligned one-dimensional metallic chains embedded in a two-dimensional semiconductor. Electron quasiparticles form one- and two-dimensional standing waves side by side. This special microscopic structure results in strong transport anisotropy. Along the chain direction the material behaves like a metal, while perpendicular to the chain direction, it behaves like a semiconductor. These findings provide an important basis for further investigation of this intriguing system.
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