Flat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi3Bi5

Zhicheng Jiang, Zhengtai Liu (), Haiyang Ma, Wei Xia, Zhonghao Liu, Jishan Liu, Soohyun Cho, Yichen Yang, Jianyang Ding, Jiayu Liu, Zhe Huang, Yuxi Qiao, Jiajia Shen, Wenchuan Jing, Xiangqi Liu, Jianpeng Liu (), Yanfeng Guo () and Dawei Shen ()
Additional contact information
Zhicheng Jiang: Chinese Academy of Sciences
Zhengtai Liu: Chinese Academy of Sciences
Haiyang Ma: ShanghaiTech University
Wei Xia: ShanghaiTech University
Zhonghao Liu: Chinese Academy of Sciences
Jishan Liu: Chinese Academy of Sciences
Soohyun Cho: Chinese Academy of Sciences
Yichen Yang: Chinese Academy of Sciences
Jianyang Ding: Chinese Academy of Sciences
Jiayu Liu: Chinese Academy of Sciences
Zhe Huang: ShanghaiTech University
Yuxi Qiao: Chinese Academy of Sciences
Jiajia Shen: Chinese Academy of Sciences
Wenchuan Jing: Chinese Academy of Sciences
Xiangqi Liu: ShanghaiTech University
Jianpeng Liu: ShanghaiTech University
Yanfeng Guo: ShanghaiTech University
Dawei Shen: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract A representative class of kagome materials, AV3Sb5 (A = K, Rb, Cs), hosts several unconventional phases such as superconductivity, $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial topological states, and electronic nematic states. These can often coexist with intertwined charge-density wave states. Recently, the discovery of the isostructural titanium-based single-crystals, ATi3Bi5 (A = K, Rb, Cs), which exhibit similar multiple exotic states but without the concomitant charge-density wave, has opened an opportunity to disentangle these complex states in kagome lattices. Here, we combine high-resolution angle-resolved photoemission spectroscopy and first-principles calculations to investigate the low-lying electronic structure of RbTi3Bi5. We demonstrate the coexistence of flat bands and several non-trivial states, including type-II Dirac nodal lines and $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial topological surface states. Our findings also provide evidence for rotational symmetry breaking in RbTi3Bi5, suggesting a directionality to the electronic structure and the possible emergence of pure electronic nematicity in this family of kagome compounds.

Date: 2023
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DOI: 10.1038/s41467-023-40515-3

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