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

Author

Listed:
  • Jiangang Yang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Xinwei Yi

    (University of Chinese Academy of Sciences)

  • Zhen Zhao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yuyang Xie

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Taimin Miao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hailan Luo

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hao Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Bo Liang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Wenpei Zhu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yuhan Ye

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jing-Yang You

    (National University of Singapore)

  • Bo Gu

    (University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    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
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Guodong Liu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Zuyan Xu

    (Chinese Academy of Sciences)

  • Hui Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Haitao Yang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Gang Su

    (University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hongjun Gao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Lin Zhao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • X. J. Zhou

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

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.

Suggested Citation

  • 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 & Zhimi, 2023. "Observation of flat band, Dirac nodal lines and topological surface states in Kagome superconductor CsTi3Bi5," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39620-0
    DOI: 10.1038/s41467-023-39620-0
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    References listed on IDEAS

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    1. 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, 2023. "Flat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi3Bi5," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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