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Topological flat bands in frustrated kagome lattice CoSn

Author

Listed:
  • Mingu Kang

    (Massachusetts Institute of Technology)

  • Shiang Fang

    (Harvard University
    Harvard University
    Rutgers University)

  • Linda Ye

    (Massachusetts Institute of Technology)

  • Hoi Chun Po

    (Massachusetts Institute of Technology)

  • Jonathan Denlinger

    (E. O. Lawrence Berkeley National Laboratory)

  • Chris Jozwiak

    (E. O. Lawrence Berkeley National Laboratory)

  • Aaron Bostwick

    (E. O. Lawrence Berkeley National Laboratory)

  • Eli Rotenberg

    (E. O. Lawrence Berkeley National Laboratory)

  • Efthimios Kaxiras

    (Harvard University
    Harvard University)

  • Joseph G. Checkelsky

    (Massachusetts Institute of Technology)

  • Riccardo Comin

    (Massachusetts Institute of Technology)

Abstract

Electronic flat bands in momentum space, arising from strong localization of electrons in real space, are an ideal stage to realize strongly-correlated phenomena. Theoretically, the flat bands can naturally arise in certain geometrically frustrated lattices, often with nontrivial topology if combined with spin-orbit coupling. Here, we report the observation of topological flat bands in frustrated kagome metal CoSn, using angle-resolved photoemission spectroscopy and band structure calculations. Throughout the entire Brillouin zone, the bandwidth of the flat band is suppressed by an order of magnitude compared to the Dirac bands originating from the same orbitals. The frustration-driven nature of the flat band is directly confirmed by the chiral d-orbital texture of the corresponding real-space Wannier functions. Spin-orbit coupling opens a large gap of 80 meV at the quadratic touching point between the Dirac and flat bands, endowing a nonzero Z2 invariant to the flat band. These findings demonstrate that kagome-derived flat bands are a promising platform for novel emergent phases of matter at the confluence of strong correlation and topology.

Suggested Citation

  • Mingu Kang & Shiang Fang & Linda Ye & Hoi Chun Po & Jonathan Denlinger & Chris Jozwiak & Aaron Bostwick & Eli Rotenberg & Efthimios Kaxiras & Joseph G. Checkelsky & Riccardo Comin, 2020. "Topological flat bands in frustrated kagome lattice CoSn," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17465-1
    DOI: 10.1038/s41467-020-17465-1
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    Cited by:

    1. Wenbin Wu & Zeping Shi & Mykhaylo Ozerov & Yuhan Du & Yuxiang Wang & Xiao-Sheng Ni & Xianghao Meng & Xiangyu Jiang & Guangyi Wang & Congming Hao & Xinyi Wang & Pengcheng Zhang & Chunhui Pan & Haifeng , 2024. "The discovery of three-dimensional Van Hove singularity," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Gan Liu & Xinran Ma & Kuanyu He & Qing Li & Hengxin Tan & Yizhou Liu & Jie Xu & Wenna Tang & Kenji Watanabe & Takashi Taniguchi & Libo Gao & Yaomin Dai & Hai-Hu Wen & Binghai Yan & Xiaoxiang Xi, 2022. "Observation of anomalous amplitude modes in the kagome metal CsV3Sb5," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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