Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Focus Session: Antiferromagnetic Spintronics
MA 2.2: Vortrag
Montag, 20. März 2017, 10:00–10:15, HSZ 01
Route towards topological antiferromagnetic spin-orbitronics — •Libor Šmejkal1,2, Jairo Sinova1,2, and Tomáš Jungwirth2 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany — 2Institute of Physics of the Czech Academy of Sciences, CZ-16253 Prague, Czech Republic
We present our recent theoretical predictions of topologically nontrivial antiferromagnets (AF) useful for spin-orbitronics. We start with derivation of symmetry criteria and minimal models for the nontrivial bulk and surface topologies in AF. We identify real material candidates by using the first-principles calculations, e.g. CuMnAs.[1]
We discuss in detail an emergent electric control of Dirac fermions by Néel spin orbit torques (NSOT) in an AF preserving the combination of spatial and time inversion symmetry.[1] We explain physical mechanism of the control of the bands-topology by tuning the non-symmorphic crystal symmetry via the staggered order reorientation. We reveal the necessary criteria to accommodate Dirac quasi-particles and NSOT simultaneously in single material platform.
In the last part we demonstrate the merits of Dirac and Weyl fermions for spin-orbitronics transport effects in collinear and non-collinear AF by first-principles calculations. We suggest novel magneto-transport effects, for instance topological anisotropic magnetoresistance (AMR). We propose experimental setup for the observation of the topological AMR as clear signature of Dirac fermions.
[1] L. Šmejkal et al., eprint arXiv:1610.08107 (2016)