Magnetic Weyl semimetal phase in a Kagomé crystal.
basic_science · Level V
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- Record sourced from PubMed, PMID 31604236.
- Also identified by DOI 10.1126/science.aav2873.
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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 Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> and discovered its characteristic surface Fermi-arcs and linear bulk band dispersions across the Weyl points. These results establish Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> 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.