Magnetic Weyl semimetal phase in a Kagomé crystal

D F Liu; A J Liang; E K Liu; Q N Xu; Y W Li; C Chen; D Pei; W J Shi; S K Mo; P Dudin; T Kim; C Cacho; G Li; Y Sun; L X Yang; Z K Liu; S S P Parkin; C Felser; Y L Chen

doi:10.1126/science.aav2873

Magnetic Weyl semimetal phase in a Kagomé crystal

Science. 2019 Sep 20;365(6459):1282-1285. doi: 10.1126/science.aav2873.

Authors

D F Liu^#^{1

2}, A J Liang^#^{2

3

4}, E K Liu^#^{5

6}, Q N Xu^#⁵, Y W Li⁷, C Chen^{2

3

7}, D Pei⁷, W J Shi², S K Mo⁴, P Dudin⁸, T Kim⁸, C Cacho⁸, G Li^{2

3}, Y Sun⁵, L X Yang⁹, Z K Liu^{2

3}, S S P Parkin¹, C Felser^{5

10

11}, Y L Chen^{12

3

7

9}

Affiliations

¹ Max Planck Institute of Microstructure Physics, Halle 06120, Germany.
² School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
³ ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China.
⁴ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
⁵ Max Planck Institute for Chemical Physics of Solids, Dresden D-01187, Germany.
⁶ Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
⁷ Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, UK.
⁸ Diamond Light Source, Didcot OX11 0DE, UK.
⁹ State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics and Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing 100084, China.
¹⁰ John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
¹¹ Department of Physics, Harvard University, Cambridge, MA 02138, USA.
¹² School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China. yulin.chen@physics.ox.ac.uk.

^# Contributed equally.

PMID: 31604236
DOI: 10.1126/science.aav2873

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.

Publication types

Research Support, Non-U.S. Gov't