Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spin-dependent Transport Phenomena

MA 10.6: Vortrag

Montag, 31. März 2014, 16:30–16:45, HSZ 403

First principles calculation of spin chirality contribution to thermoelectric transport effects — •Jürgen Weischenberg, Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov — Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

In magnetic systems with a non-collinear configuration of spins, the conduction electrons may acquire a geometrical phase, the so-called Berry phase, which gives rise to a topological contribution to the transverse current in response to an external field. In contrast to the anomalous Hall effect, which originates from the spin-orbit interaction (SOI), the topological contribution also exists in systems without SOI and in which the scalar spin chirality symmetry is non-zero. In this work, we take nano-skyrmionic lattices as such an example and study the influence of SOI on the topological contribution in the presence of an electric field or a temperature gradient. For this purpose, we compute the electronic properties of the spin texture in real space using density functional theory. We then employ the Wannier interpolation technique in order to examine the various thermoelectric transport coefficients within linear response.

Financial support by the HGF-YIG Programme VH-NG-513 is gratefully acknowledged. J. W. was supported under grant SPP 1538 SpinCaT by the German Science Foundation.