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. 2020 Jan 28;11:559. doi: 10.1038/s41467-020-14325-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Magnetic structure of Co₃Sn₂S₂, showing a ferromagnetic ground state with spins on Co atoms aligned along the c-axis. b Kagome lattice structure of the Co₃Sn layer. c Topographic image of the CoSn surface. d A zoom-in image of the CoSn surface (left) that shows similar morphology with the FeSn surface (right) in Fe₃Sn₂. The inset illustrates the possible atomic assignment of the kagome lattice. Data are taken at the tunnelling junction: V = 50 mV, I = 0.8 nA, T = 4.2 K. e Fermi surface of Co₃Sn₂S₂ acquired using angle-resolved photoemission spectroscopy (ARPES) at temperature T = 22 K with surface Brillouin zone (green lines) determined from the crystal structure; predicted topological band crossing points (positive Chern number: blue dots, negative Chern number: red dots) from first-principles calculation; and a closed surface momentum-space loop (purple quadrilateral). f Energy-momentum cut along the purple loop, indicating an unconventional odd number of band crossings. g Calculated (momentum-resolved) surface density of states at E_F for Co₃Sn₂S₂.