SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.21: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Spin and orbital texture of the Weyl semimetal MoTe2 studied by spin-resolved momentum microscopy — •Kenta Hagiwara1, Xin Liang Tan1, Philipp Rüßmann1, Ying-Jiun Chen1, 2, Koji Fukushima3, Keiji Ueno3, Vitaliy Feyer1, Shigemasa Suga1, 4, Stefan Blügel1, Claus M. Schneider1, 2, and Christian Tusche1, 2 — 1Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich — 2Fakultät für Physik, Universität Duisburg-Essen, 47057 Duisburg — 3Saitama University, 338-8570, Saitama, Japan — 4Osaka University, 567-0047, Osaka, Japan
Weyl semimetals host chiral fermions in solids as a pair of non-degenerate linear dispersions with band crossing points in their bulk electronic structure. These Weyl points are protected by topology, forming a Fermi arc, which is a connection between a pair of Weyl points with opposite chirality at the surface. Momentum microscopy provides two dimensional photoelectron maps of the in-plane crystal momentum over the whole Brillouin zone, simultaneously. Together with an imaging spin filter, we have revealed the spin-resolved electronic structure of the type-II Weyl semimetal 1Td MoTe2 in the full Brillouin zone. Supported by first-principles calculations, we clarified the spin texture and the orbital texture of the Weyl cones, which reflect the chirality of the Weyl points. We give evidence that a pair of Weyl cones exhibits a strong circular dichroism with reversed sign, indicating the different charge of the respective Weyl points in the Fermi surface.