Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
10 Aug 2020
10 Aug 2020
Historique:
received:
06
01
2020
accepted:
30
06
2020
entrez:
12
8
2020
pubmed:
12
8
2020
medline:
12
8
2020
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 32778641
doi: 10.1038/s41467-020-17462-4
pii: 10.1038/s41467-020-17462-4
pmc: PMC7417585
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
4002Subventions
Organisme : National Natural Science Foundation of China (National Science Foundation of China)
ID : 11704394
Organisme : National Natural Science Foundation of China (National Science Foundation of China)
ID : 11674030
Organisme : National Natural Science Foundation of China (National Science Foundation of China)
ID : 11774423, 11822412, 1574394
Organisme : Science and Technology Commission of Shanghai Municipality (Shanghai Municipal Science and Technology Commission)
ID : 18QA1403100
Organisme : Science and Technology Commission of Shanghai Municipality (Shanghai Municipal Science and Technology Commission)
ID : 18QA1403100
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