Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Functional Antiferromagnetism
MA 34.7: Talk
Thursday, September 8, 2022, 16:30–16:45, H48
Spontaneous anomalous Hall effect arising from antiparallel magnetic order in a semiconductor — •Ruben Dario Gonzalez Betancourt1,2,3,4, Jan Zubáč3,4, Rafael Julian Gonzalez Hernandez5, Kevin Geishendorf3, Zbynek Šobáň3, Gunther Springholz6, Kamil Olejník3, Libor Šmejkal3, Tomas Jungwirth3,7, Sebastian Tobias Benedikt Goennenwein1,8, Andy Thomas1,2, Helena Reichlová3, Jakub Železný3, and Dominik Kriegner1,3 — 1IFMP, TU Dresden — 2IFW Dresden — 3Institute of Physics, AV ČR, Prague — 4Charles University, Prague — 5Universidad del Norte, Barranquilla — 6Semiconductor Physics, JKU Linz — 7University of Nottingham — 8University of Konstanz
It is known that collinear antiferromagnets cannot host a spin split band structure and therefore not show any anomalous Hall effect. Following the recent theory development [1], we experimentally show that this paradigm needs to be revised. We theoretically identify and experimentally confirm the symmetry components of the longitudinal and transversal anisotropic magnetoresistance in thin films of the compensated collinear antiferromagnet MnTe. We experimentally find a hysteretic signal odd in magnetic field in the transversal magnetoresistance, i.e. spontaneous anomalous Hall effect [2]. This effect can be rationalized considering nonmagnetic atoms at non-centrosymmetric lattice sites which break additional symmetries and cause a spin splitting in certain parts of the Brillouin zone.
[1] L. Šmejkal et al., Sci. Adv. 6, aaz8809(2020)
[2] R. D. Gonzalez Betancourt et al., (2021) arXiv:2112.06805