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- Title
Observation of flat band, Dirac nodal lines and topological surface states in Kagome superconductor CsTi<sub>3</sub>Bi<sub>5</sub>.
- Authors
Yang, Jiangang; Yi, Xinwei; Zhao, Zhen; Xie, Yuyang; Miao, Taimin; Luo, Hailan; Chen, Hao; Liang, Bo; Zhu, Wenpei; Ye, Yuhan; You, Jing-Yang; Gu, Bo; Zhang, Shenjin; Zhang, Fengfeng; Yang, Feng; Wang, Zhimin; Peng, Qinjun; Mao, Hanqing; Liu, Guodong; Xu, Zuyan
- 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, Z 2 nontrivial topological surface states are also observed due to band inversion mediated by strong spin-orbit coupling. Kagome superconductors host a panoply of condensed matter phenomena, some of which are mediated by band topology. Here, authors use ARPES and DFT to identify type-II and type-III Dirac nodal lines, flat bands and topological surface states in the kagome metal CsTi3Bi5.
- Subjects
SURFACE states; QUANTUM spin liquid; PHOTOEMISSION; SUPERCONDUCTORS; BLOCH waves; SEMIMETALS; ANOMALOUS Hall effect; ALKALI metals
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-39620-0