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Bibliographic Details
Main Authors:	Cai, Yongqing, Wang, Jianfeng, Wang, Yuan, Hao, Zhanyang, Liu, Yixuan, Jiang, Zhicheng, Sui, Xuelei, Ma, Xiaoming, Zhang, Chengcheng, Shen, Zecheng, Yang, Yichen, Liu, Wanling, Jiang, Qi, Liu, Zhengtai, Ye, Mao, Shen, Dawei, Liu, Yi, Cui, Shengtao, Wang, Le, Liu, Cai, Lin, Junhao, Huang, Bing, Mei, Jia-Wei, Chen, Chaoyu
Format:	Preprint
Published:	2022
Subjects:	Strongly Correlated Electrons
Online Access:	https://arxiv.org/abs/2201.12851
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Table of Contents:

Lorentz-violating type-II Dirac nodal line semimetals (DNLSs), hosting curves of band degeneracy formed by two dispersion branches with the same sign of slope, represent a novel states of matter. While being studied extensively in theory, convincing experimental evidences of type-II DNLSs remain elusive. Recently, Vanadium-based kagome materials have emerged as a fertile ground to study the interplay between lattice symmetry and band topology. In this work, we study the low-energy band structure of double-kagome-layered CsV$_8$Sb$_{12}$ and identify it as a scarce type-II DNLS protected by mirror symmetry. We have observed multiple DNLs consisting of type-II Dirac cones close to or almost at the Fermi level via angle-resolved photoemission spectroscopy (ARPES). First-principle analyses show that spin-orbit coupling only opens a small gap, resulting effectively gapless ARPES spectra, yet generating large spin Berry curvature. These type-II DNLs, together with the interaction between a low-energy van Hove singularity and quasi-1D band as we observed in the same material, suggest CsV$_8$Sb$_{12}$ as an ideal platform for exploring novel transport properties such as chiral anomaly, the Klein tunneling and fractional quantum Hall effect.

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