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MA: Fachverband Magnetismus
MA 9: Weyl Semimetals
MA 9.5: Vortrag
Montag, 16. März 2020, 12:30–12:45, POT 6
Unconventional Fermi arcs in an ultrathin complex magnet — •Ying-Jiun Chen1,2, Jan-Philipp Hanke1,3, Markus Hoffmann1,3, Gustav Bihlmayer1,3, Yuriy Mokrousov1,3,4, Stefan Blügel1,3, Claus M. Schneider1,2, and Christian Tusche1,2 — 1Peter Grünberg Institut, Forschungszentrum Jülich, D-52425 Jülich — 2Fakultät für Physik, Universität Duisburg-Essen, D-47057 Duisburg — 3Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich — 4Institute of Physics, Johannes Gutenberg University Mainz, D-55099 Mainz
The discovery of topological states of matter has led to a revolution in materials research. When external or intrinsic parameters break certain symmetries, global properties of topological materials change drastically. A paramount example is the emergence of Weyl nodes under broken inversion symmetry, acting like magnetic monopoles in momentum space. In this talk, we demonstrate that under broken time-reversal symmetry open Fermi arcs appear at the surface of the complex magnet 2 ML Fe/W(110). Our spin- and orbital-resolved momentum microscopy experiments together with density functional theory give evidence that the Fermi-surface topology of the atomically thin ferromagnet is substantially modified by the hybridization with a heavy-metal substrate, giving rise to Fermi-surface discontinuities being bridged by the Fermi arcs. The hybridization points are attributed to a non-trivial “mixed” topology and induce hot spots in the Berry curvature, dominating spin and charge transport as well as magneto-electric coupling effects.