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

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [7];  [10];  [6];  [4];  [11];  [11]
  1. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Microsystem and Information Technology. Center for Excellence in Superconducting Electronics. State Key Lab. of Functional Materials for Informatics; Univ. of Chinese Academy of Sciences (CAS), Beijing (China). College of Materials Science and Opto-Electronic Technology; OSTI
  2. Renmin Univ. of China, Beijing (China). d Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices. Dept. of Physics; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Advanced Research Inst.
  3. Renmin Univ. of China, Beijing (China). d Beijing Key Laboratory of Opto-Electronic Functional Materials&Micro-Nano Devices. Dept. of Physics
  4. Beijing Normal Univ., Beijing (China). Dept. of Physics and Center for Advanced Quantum Studies
  5. ShanghaiTech Univ. (China). School of Physical Science and Technology
  6. Boston College, Chestnut Hill, MA (United States). Dept. of Physics
  7. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Microsystem and Information Technology. Center for Excellence in Superconducting Electronics. State Key Lab. of Functional Materials for Informatics; Univ. of Chinese Academy of Sciences (CAS), Beijing (China). College of Materials Science and Opto-Electronic Technology
  8. ShanghaiTech Univ. (China). School of Physical Science and Technology
  9. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Advanced Research Inst.
  10. Princeton Univ., NJ (United States). Dept. of Physics. Lab. for Topological Quantum Matter and Advanced Spectroscopy
  11. Renmin Univ. of China, Beijing (China). d Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices. Dept. of Physics
+ Show Author Affiliations

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.

Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-99ER45747
OSTI ID:
1800968
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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