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Magnetic Weyl semimetal phase in a Kagomé crystal.

  • Author(s): Liu, DF
  • Liang, AJ
  • Liu, EK
  • Xu, QN
  • Li, YW
  • Chen, C
  • Pei, D
  • Shi, WJ
  • Mo, SK
  • Dudin, P
  • Kim, T
  • Cacho, C
  • Li, G
  • Sun, Y
  • Yang, LX
  • Liu, ZK
  • Parkin, SSP
  • Felser, C
  • Chen, YL
  • et al.
Abstract

Weyl semimetals are crystalline solids that host emergent relativistic Weyl fermions and have characteristic surface Fermi-arcs in their electronic structure. Weyl semimetals with broken time reversal symmetry are difficult to identify unambiguously. In this work, using angle-resolved photoemission spectroscopy, we visualized the electronic structure of the ferromagnetic crystal Co3Sn2S2 and discovered its characteristic surface Fermi-arcs and linear bulk band dispersions across the Weyl points. These results establish Co3Sn2S2 as a magnetic Weyl semimetal that may serve as a platform for realizing phenomena such as chiral magnetic effects, unusually large anomalous Hall effect and quantum anomalous Hall effect.

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