Magnetic Weyl semimetal phase in a Kagomé crystal

DOI: 10.1126/science.aav2873

Authors: D. F. Liu (Max Planck Institute of Microstructure Physics; ShanghaiTech University) , A. J. Liang (ShanghaiTech University; ShanghaiTech Laboratory for Topological Physics; Advanced Light Source) , E. K. Liu (Max Planck Institute for Chemical Physics of Solids; Institute of Physics, Chinese Academy of Sciences) , Q. N. Xu (Max Planck Institute for Chemical Physics of Solids) , Y. W. Li (University of Oxford) , C. Chen (ShanghaiTech University; ShanghaiTech Laboratory for Topological Physics; University of Oxford) , D. Pei (University of Oxford) , W. J. Shi (ShanghaiTech University) , S. K. Mo (Advanced Light Source) , P. Dudin (Diamond Light Source) , T. Kim (Diamond Light Source) , C. Cacho (Diamond Light Source) , G. Li (ShanghaiTech University; ShanghaiTech Laboratory for Topological Physics) , Y. Sun (Max Planck Institute for Chemical Physics of Solids) , L. X. Yang (Tsinghua University) , Z. K. Liu (ShanghaiTech University; ShanghaiTech Laboratory for Topological Physics) , S. S. P. Parkin (Max Planck Institute of Microstructure Physics) , C. Felser (Max Planck Institute for Chemical Physics of Solids; Harvard University) , Y. L. Chen (ShanghaiTech University; ShanghaiTech Laboratory for Topological Physics; University of Oxford; Tsinghua University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science , VOL 365 , PAGES 1282 - 1285

State: Published (Approved)
Published: September 2019
Diamond Proposal Number(s): 22367 , 20683

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.

Subject Areas: Physics, Materials


Instruments: I05-ARPES