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MA: Fachverband Magnetismus
MA 9: Weyl Semimetals
MA 9.4: Vortrag
Montag, 16. März 2020, 12:15–12:30, POT 6
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 Suga4, 1, 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 — 3Department of Chemistry, Saitama University, 338-8570, Saitama, Japan — 4ISIR, Osaka 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 bulk. These Weyl points are protected by crystal symmetry, 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 photonelectron 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. Combined with the use of differently polarized light, we have revealed the spin texture and the orbital texture of the Weyl cones in comparison with first-principles calculations. 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.