Magnetic Weyl semimetal phase in a Kagomé crystal

• Published in: Science (American Association for the Advancement of Science) Vol. 365; no. 6459; pp. 1282 - 1285
• Main Authors: Liu, D. F., Liang, A. J., Liu, E. K., Xu, Q. N., Li, Y. W., Chen, C., Pei, D., Shi, W. J., Mo, S. K., Dudin, P., Kim, T., Cacho, C., Li, G., Sun, Y., Yang, L. X., Liu, Z. K., Parkin, S. S. P., Felser, C., Chen, Y. L.
• Format: Journal Article
• Language: English
• Published: United States American Association for the Advancement of Science 20.09.2019; The American Association for the Advancement of Science; AAAS
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Crystal structure; Electromagnetism; Electronic structure; Fermions; Ferromagnetism; Magnetic effects; Magnetic materials; Metalloids; Photoelectric emission; Photoelectron spectroscopy; Quantum Hall effect; Spectroscopy; Spectrum analysis; Symmetry
• ISSN: 0036-8075; 1095-9203; 1095-9203
• DOI: 10.1126/science.aav2873

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.