Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 59: Topological Insulators II (jointly with DS, HL, O, TT)
MA 59.4: Vortrag
Freitag, 24. März 2017, 10:15–10:30, HSZ 04
Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn — •Hao Yang1,2, Yan Sun2, Yang Zhang2,3, Wu-Jun Shi2, Stuart S. P. Parkin1, and Binghai Yan2 — 1Max Planck Institute of Microstructure Physics, 06120 Halle(Saale), Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany
It was recently found in experiment that Mn3Sn and Mn3Ge exhibit a strong anomalous Hall effect at room temperature, provoking us to explore their electronic structures for topological properties. By ab initio band structure calculations, we have observed the existence of multiple Weyl points in the bulk and corresponding Fermi arcs on the surface, predicting antiferromagnetic Weyl semimetals in the titled compounds [1]. Here the chiral antiferromagnetism in the Kagome-type lattice structure is essential to determine the positions and numbers of Weyl points. Our work further reveals a new guiding principle to search for magnetic Weyl semimetals among materials that exhibit a strong anomalous Hall effect. [1] H Yang, Y Sun, Y Zhang et.al., arXiv preprint arXiv:1608.03404 (2016)