Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn

Zhonghao Liu (), Man Li, Qi Wang, Guangwei Wang, Chenhaoping Wen, Kun Jiang, Xiangle Lu, Shichao Yan, Yaobo Huang, Dawei Shen, Jia-Xin Yin, Ziqiang Wang, Zhiping Yin (), Hechang Lei () and Shancai Wang ()
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Zhonghao Liu: Chinese Academy of Sciences
Man Li: Renmin University of China
Qi Wang: Renmin University of China
Guangwei Wang: Beijing Normal University
Chenhaoping Wen: ShanghaiTech University
Kun Jiang: Boston College
Xiangle Lu: Chinese Academy of Sciences
Shichao Yan: ShanghaiTech University
Yaobo Huang: Chinese Academy of Sciences
Dawei Shen: Chinese Academy of Sciences
Jia-Xin Yin: Princeton University
Ziqiang Wang: Boston College
Zhiping Yin: Beijing Normal University
Hechang Lei: Renmin University of China
Shancai Wang: Renmin University of China

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Layered kagome-lattice 3d transition metals are emerging as an exciting platform to explore the frustrated lattice geometry and quantum topology. However, the typical kagome electronic bands, characterized by sets of the Dirac-like band capped by a phase-destructive flat band, have not been clearly observed, and their orbital physics are even less well investigated. Here, we present close-to-textbook kagome bands with orbital differentiation physics in CoSn, which can be well described by a minimal tight-binding model with single-orbital hopping in Co kagome lattice. The capping flat bands with bandwidth less than 0.2 eV run through the whole Brillouin zone, especially the bandwidth of the flat band of out-of-plane orbitals is less than 0.02 eV along Γ−M. The energy gap induced by spin-orbit interaction at the Dirac cone of out-of-plane orbitals is much smaller than that of in-plane orbitals, suggesting orbital-selective character of the Dirac fermions.

Date: 2020
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DOI: 10.1038/s41467-020-17462-4

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