Observation of flat band, Dirac nodal lines and topological surface states in Kagome superconductor CsTi3Bi5

Jiangang Yang, Xinwei Yi, Zhen Zhao, Yuyang Xie, Taimin Miao, Hailan Luo, Hao Chen, Bo Liang, Wenpei Zhu, Yuhan Ye, Jing-Yang You, Bo Gu, Shenjin Zhang, Fengfeng Zhang, Feng Yang, Zhimin Wang, Qinjun Peng, Hanqing Mao, Guodong Liu, Zuyan Xu, Hui Chen, Haitao Yang, Gang Su (), Hongjun Gao (), Lin Zhao () and X. J. Zhou ()
Additional contact information
Jiangang Yang: Chinese Academy of Sciences
Xinwei Yi: University of Chinese Academy of Sciences
Zhen Zhao: Chinese Academy of Sciences
Yuyang Xie: Chinese Academy of Sciences
Taimin Miao: Chinese Academy of Sciences
Hailan Luo: Chinese Academy of Sciences
Hao Chen: Chinese Academy of Sciences
Bo Liang: Chinese Academy of Sciences
Wenpei Zhu: Chinese Academy of Sciences
Yuhan Ye: Chinese Academy of Sciences
Jing-Yang You: National University of Singapore
Bo Gu: University of Chinese Academy of Sciences
Shenjin Zhang: Chinese Academy of Sciences
Fengfeng Zhang: Chinese Academy of Sciences
Feng Yang: Chinese Academy of Sciences
Zhimin Wang: Chinese Academy of Sciences
Qinjun Peng: Chinese Academy of Sciences
Hanqing Mao: Chinese Academy of Sciences
Guodong Liu: Chinese Academy of Sciences
Zuyan Xu: Chinese Academy of Sciences
Hui Chen: Chinese Academy of Sciences
Haitao Yang: Chinese Academy of Sciences
Gang Su: University of Chinese Academy of Sciences
Hongjun Gao: Chinese Academy of Sciences
Lin Zhao: Chinese Academy of Sciences
X. J. Zhou: Chinese Academy of Sciences

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

Abstract: Abstract Kagome lattices of various transition metals are versatile platforms for achieving anomalous Hall effects, unconventional charge-density wave orders and quantum spin liquid phenomena due to the strong correlations, spin-orbit coupling and/or magnetic interactions involved in such a lattice. Here, we use laser-based angle-resolved photoemission spectroscopy in combination with density functional theory calculations to investigate the electronic structure of the newly discovered kagome superconductor CsTi3Bi5, which is isostructural to the AV3Sb5 (A = K, Rb or Cs) kagome superconductor family and possesses a two-dimensional kagome network of titanium. We directly observe a striking flat band derived from the local destructive interference of Bloch wave functions within the kagome lattice. In agreement with calculations, we identify type-II and type-III Dirac nodal lines and their momentum distribution in CsTi3Bi5 from the measured electronic structures. In addition, around the Brillouin zone centre, $${{\mathbb{Z}}}_{2}$$ Z 2 nontrivial topological surface states are also observed due to band inversion mediated by strong spin-orbit coupling.

Date: 2023
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DOI: 10.1038/s41467-023-39620-0

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