Dirac fermions and flat bands in the ideal kagome metal FeSn.
Journal
Nature materials
ISSN: 1476-4660
Titre abrégé: Nat Mater
Pays: England
ID NLM: 101155473
Informations de publication
Date de publication:
Feb 2020
Feb 2020
Historique:
received:
05
06
2019
accepted:
08
10
2019
pubmed:
11
12
2019
medline:
11
12
2019
entrez:
11
12
2019
Statut:
ppublish
Résumé
A kagome lattice of 3d transition metal ions is a versatile platform for correlated topological phases hosting symmetry-protected electronic excitations and magnetic ground states. However, the paradigmatic states of the idealized two-dimensional kagome lattice-Dirac fermions and flat bands-have not been simultaneously observed. Here, we use angle-resolved photoemission spectroscopy and de Haas-van Alphen quantum oscillations to reveal coexisting surface and bulk Dirac fermions as well as flat bands in the antiferromagnetic kagome metal FeSn, which has spatially decoupled kagome planes. Our band structure calculations and matrix element simulations demonstrate that the bulk Dirac bands arise from in-plane localized Fe-3d orbitals, and evidence that the coexisting Dirac surface state realizes a rare example of fully spin-polarized two-dimensional Dirac fermions due to spin-layer locking in FeSn. The prospect to harness these prototypical excitations in a kagome lattice is a frontier of great promise at the confluence of topology, magnetism and strongly correlated physics.
Identifiants
pubmed: 31819211
doi: 10.1038/s41563-019-0531-0
pii: 10.1038/s41563-019-0531-0
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
163-169Subventions
Organisme : National Science Foundation (NSF)
ID : DMR-1231319
Organisme : National Science Foundation (NSF)
ID : DMR-1231319
Organisme : National Science Foundation (NSF)
ID : DMR-1231319
Organisme : National Science Foundation (NSF)
ID : DMR-1644779
Organisme : National Science Foundation (NSF)
ID : 1541959
Organisme : National Science Foundation (NSF)
ID : DMR-1231319
Organisme : U.S. Department of Energy (DOE)
ID : Science at 100 T
Organisme : U.S. Department of Energy (DOE)
ID : Science at 100 T
Organisme : U.S. Department of Energy (DOE)
ID : DE-AC02-98CH10886
Organisme : U.S. Department of Energy (DOE)
ID : DE-AC02-98CH10886
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : SFB 1143, project A5
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : SFB 1143, project A5
Organisme : Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation)
ID : GBMF3848
Organisme : United States Department of Defense | United States Army | U.S. Army Research, Development and Engineering Command | Army Research Office (ARO)
ID : W911NF-16-1-0034
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