Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 68.3: Vortrag
Mittwoch, 14. März 2018, 15:30–15:45, EB 407
Classification of topological antiferromagnets for spintronics — •Libor Šmejkal1,2, Jairo Sinova1,2, and Tomáš Jungwirth2 — 1INSPIRE group, Uni Mainz, Germany — 2Institute of Physics, Czech Academy of Sciences, Prague, Czech Rep.
Our recent prediction of the interplay between topological Dirac quasiparticles and spin orbit torques in antiferromagnets has opened new possibilities of studying topological spintronics [1]. In this talk we will classify topological antiferromagnets based on minimal models, present new material candidates and novel magneto-transport effects, e.g. tunable topological anisotropic magnetoresistance or quantum anomalous Hall effect. The presence of topological quasiparticles can lead to a large signal/noise ratios and novel functionalities in read-out signals in spintronics devices [2]. For example, based on ab initio theory, we have predicted a large anisotropic magnetoresistance reaching 6% in Mn2Au antiferromagnet which was recently observed in current induced torques experiments [3]. We will also demonstrate that antiferromagnets are natural candidates for combining magnetic order with topological Dirac quasiparticles owing to their unique effective time-reversal symmetries, which are not present in ferromagnets [1,2].
[1] L. Šmejkal, J. Železný, J. Sinova, and T. Jungwirth, Phys. Rev. Lett. 118 , 106402 (2017) [2] L. Šmejkal, Y. Mokrousov, B. Yan, and A. H. MacDonald, arXiv:1706.00670 [3] S. Yu. Bodnar, L. Šmejkal, M. Jourdan, et al. arXiv:1706.02482