Year: 2021
Type: article
Abstract: Nodal-line semimetals (NLSMs) contain Dirac-Weyl-type band-crossing nodes extending into shapes of lines, loops, and chains in the reciprocal space, leading to band topology and transport responses. Robust NLSMs against spin-orbit coupling typically occur in three-dimensional and in-plane isotropic materials which have more symmetry operations to protect the line nodes of band crossing, while the possibilities in exfoliatable materials with in-plane anisotropy are rarely discussed. Here, we demonstrate a robust NLSM phase in an exfoliatable in-plane anisotropic nonmagnetic semimetal $\mathrm{TaNi}{\mathrm{Te}}_{5}$. Combining angle-resolved photoemission spectroscopy measurements and first-principles calculations, we reveal multiple Dirac-type nodal lines with fourfold degeneracy in $\mathrm{TaNi}{\mathrm{Te}}_{5}$. Our findings suggest rich physics in structurally anisotropic topological materials and call for further functional exploitation based on them.
Authors: Zhanyang Hao, Weizhao Chen, Yuan Wang, Jiayu Li, Xiao-Ming Ma, Yu-Jie Hao, Ruie Lu, Zecheng Shen, Zhicheng Jiang, Wanling Liu, Qi Jiang, Yichen Yang, Xiao Lei, Le Wang, Ying Fu, Liang Zhou, Lianglong Huang, Zhengtai Liu, Mao Ye, Dawei Shen, Jiawei Mei, Hongtao He, Cai Liu, Ke Deng, Chang Liu, Qihang Liu, Chaoyu Chen
Institutions: Southern University of Science and Technology, Chinese Academy of Sciences, Shanghai Institute of Microsystem and Information Technology, University of Chinese Academy of Sciences, State Key Laboratory of Functional Materials for Informatics, Hong Kong University of Science and Technology, University of Macau, Guangdong Provincial Key Laboratory Of Computational Science And Material Design
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3202450317