Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.45: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Spin-wave excitations of magnetic skyrmion crystals — •Johannes Waizner and Markus Garst — Institute for Theoretical Physics, University of Cologne, Cologne, Germany

The cubic chiral magnets realize magnetic skyrmion crystals that correspond to topologically non-trivial, two-dimensional magnetic textures within the plane perpendicular to the applied field. The magnon excitations form, according to Bloch’s theorem, a two-dimensional band structure. First, we focus on the magnetic resonances at the Gamma point [1] and discuss their properties, in particular, their ellipticity and gyrotropy. Second, we evaluate the energy- and momentum-dependent cross section expected in inelastic neutron scattering experiments. Third, we discuss the non-trivial topology of the magnon band structure that is reflected in finite Chern numbers of some of the bands.
T. Schwarze, J. Waizner, M. Garst, A. Bauer, I. Stasinopoulos,

H. Berger, C. Pfleiderer, and D. Grundler,

Nat. Mater. 14, 478 (2015).