Magnetic Weyl Semimetal Phase in a Kagome Crystal

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.
Source :: Science 365,1282-1285 (2019)
Publication Year :: 2019
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.<br />Comment: 15 pages, 4 figures