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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.50: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Magnon excitations of magnetic helices and skyrmion crystals — •Johannes Waizner and Markus Garst — Institute for Theoretical Physics, Universität zu Köln, Köln, Germany

In chiral magnets long-range ordered magnetic crystals form with a lattice spacing proportional to the inverse of spin-orbit coupling. The magnetic helix corresponds to a one-dimensional crystal while the skyrmion lattice effectively realizes a two-dimensional magnetic crystal. We study the magnon excitations of these crystals that experience a characteristic Bragg scattering off their periodicity resulting in magnon band structure. For the helix, in particular, this leads to gaps in the spectrum that prohibit magnon propagation along the pitch direction. We also compare with recent results of inelastic neutron scattering [1].

[1] M. Kugler, G. Brandl, R. Georgii, K. Seemann, M. Janoschek, J. Waizner, M. Garst, A. Rosch, C. Pfleiderer, and P. Böni (unpublished)