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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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