Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.46: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Existence of noncollinear spin-spiral solutions of the Kohn-Sham equations for the homogeneous electron gas — •Maximilian Kulke and Arno Schindlmayr — Department Physik, Universität Paderborn, 33095 Paderborn, Germany

A spiral spin-density wave (SSDW) denotes a nonlinear magnetic configuration where the magnetization vector rotates helically around the spin-quantization axis. Such configurations are known to occur in the ground state of certain noncollinear magnetic materials, such as γ-Fe, but are also commonly studied in the frozen-magnon approximation for spin-wave excitations. Within spin-density-functional theory, SSDWs are occasionally difficult to identify due to the additional degrees of freedom, however. Here we study self-consistent spin-spiral solutions of the Kohn-Sham equations for the homogeneous electron gas with standard methods typically employed for real materials. The homogeneous electron gas allows a largely analytic treatment that avoids numerical inaccuracies affecting implementations for real materials. We use a local-spin-density functional and consider a variety of electron densities and wave vectors for the static planar helical variation of the magnetization. Our results show that noncollinear spin-spiral solutions do not exist for all parameter combinations but only for sufficiently small wave vectors, and that there are multiple solutions in some areas of the parameter space.