SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Spin Transport and Orbitronics, Spin-Hall Effects (joint session MA/TT)

TT 7.14: Vortrag

Montag, 27. März 2023, 12:45–13:00, HSZ 403

Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor — •Dominik Kriegner^1,2, Ruben Dario Gonzalez Betancourt^1,2,3,4, Jan Zubáč^1,3, Rafael Julian Gonzalez Hernandez⁵, Kevin Geishendorf⁴, Gunther Springholz⁶, Kamil Olejník¹, Jakub Železný¹, Libor Šmejkal⁷, Andy Thomas^2,4, Helena Reichlová^1,2, Sebastian Tobias Benedikt Goennenwein⁸, and Tomas Jungwirth^1,9 — ¹Institute of Physics, AV ČR, Prague, Czech Republic — ²IFMP, TU Dresden — ³Charles University, Prague — ⁴IFW Dresden — ⁵Universidad del Norte, Barranquilla, Colombia — ⁶JKU Linz, Austria — ⁷JGU, Mainz — ⁸University of Konstanz — ⁹University of Nottingham, United Kingdom

The anomalous Hall effect, commonly observed in metallic magnets, has been established to originate from the time-reversal symmetry breaking by an internal macroscopic magnetization in ferromagnets or by a non-collinear magnetic order. Here we observe a spontaneous anomalous Hall signal in the absence of an external magnetic field in an epitaxial film of MnTe, which is a semiconductor with a collinear antiparallel magnetic ordering of Mn moments and a vanishing net magnetization. The anomalous Hall effect arises from an unconventional phase with strong time-reversal symmetry breaking and alternating spin polarization in real-space crystal structure and momentum-space electronic structure.

R. D. Gonzalez Betancourt et al., arXiv:2112.06805