Dirac fermions and flat bands in the ideal kagome metal FeSn

Mingu Kang, Linda Ye, Shiang Fang, Jhih Shih You, Abe Levitan, Minyong Han, Jorge I. Facio, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Mun K. Chan, Ross D. McDonald, David Graf, Konstantine Kaznatcheev, Elio Vescovo, David C. Bell, Efthimios Kaxiras, Jeroen van den Brink, Manuel Richter, Madhav Prasad GhimireJoseph G. Checkelsky*, Riccardo Comin

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

127 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)163-169
頁數7
期刊Nature Materials
19
發行號2
DOIs
出版狀態已發佈 - 2020 2月 1
對外發佈

ASJC Scopus subject areas

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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