Magnetic Weyl semimetal phase in a Kagomé crystal

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...

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Bibliographic Details
Published in:	Science (American Association for the Advancement of Science) 2019-09, Vol.365 (6459), p.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:	Article
Language:	eng
Subjects:	CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Crystal structure Electromagnetism Electronic structure Fermions Ferromagnetism Inversion Magnetic effects Magnetic materials Metalloids Photoelectric emission Photoelectron spectroscopy Quantum Hall effect Spectroscopy Spectrum analysis Symmetry
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Summary:	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 Sn S and discovered its characteristic surface Fermi-arcs and linear bulk band dispersions across the Weyl points. These results establish Co Sn S 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.
ISSN:	0036-8075 1095-9203