Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.49: Poster

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

Scattering of high-energy magnons from a magnetic skyrmion — •Sarah Schroeter and Markus Garst — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

The skyrmion is a topologically stable soliton solution in chiral magnets and corresponds to a large-amplitude excitation of the field-polarized ground state. We consider the fluctuation spectrum around such a soliton with particular focus on the scattering of high-energy magnons. The topological winding number of the skyrmion results in a finite Aharanov-Bohm flux density in the scattering potential that leads to skew and rainbow scattering of magnons [1]. We consider the differential cross section and the magnon pressure on the skyrmion within a semiclassical approximation and derive their high-energy asymptotics.

[1] C. Schütte and M. Garst, Phys. Rev. B 90, 094423 (2014).