Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 68.11: Vortrag
Mittwoch, 14. März 2018, 17:45–18:00, EB 407
Magnetic Weyl Semimetal in Quasi Two-dimensional Half Metallic Co3Sn2S2 and Co3Sn2Se2 — •Qiunan Xu1, Enke Liu1, Lukas Muechler2, Claudia Felser1, and Yan Sun1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden 01187 , Germany — 2Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
A Weyl semimetal can exist in a time reversal or inversion symmetry breaking system. Since the Berry curvature is odd under time reversal, the Berry curvature from Weyl points are expected to generate a large anomalous Hall effect in time reversal symmetry breaking Weyl semimetals. Since the Weyl points are far away from Fermi energy for most of the candidate magnetic Weyl semimetals, Weyl points related physics was observed in them so far. In this work, we find a Weyl semimetal phase in half metallic ferromagnet Co3Sn2S2 with Weyl points only 60 meV away from the Fermi level, which derive from nodal lines that are gapped by spin-orbit coupling. Therefore, the Weyl-related physics should be easy to detected by both surface ARPES and bulk transport measurements. Due to the Berry curvature deriving from the gapped nodal lines and Weyl points, its anomalous Hall conductivity can reach up to 1200 S/cm. Substituting S by Se, Co3Sn2Se2 shows very similar property. Moreover, since Co3Sn2S2 and Co3Sn2Se2 are both easily grown quasi two-dimensional compounds, they provide an ideal platform for the study of magnetic Weyl physics and its future application in topological material based spintronic devices.