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TT: Fachverband Tiefe Temperaturen

TT 69: Correlated Electrons: Spin Systems and Itinerant Magnets - Chiral Magnets

TT 69.1: Talk

Wednesday, April 2, 2014, 15:00–15:15, HSZ 204

Effective mass of skyrmions in chiral magnets — •Christoph Schütte, Markus Garst, and Achim Rosch — Universität zu Köln, Zülpicher Straße 77, D-50937 Köln

A single skyrmion in a ferromagnetic background is due to its topological protection a long-lived, large-amplitude excitation. It can be described by a collective coordinate and interpreted as a quasi-particle. To understand its dynamics, it is not sufficient to consider only a rigid skyrmion but also the effects of fluctuations have to be included. We calculate the numerically exact fluctuation spectrum and scattering wavefunctions taking both thermal and quantum fluctuations into account. We show that this gives rise to additional terms in the effective action for the collective coordinate and determine the angle-resolved scattering amplitude and the mass of the skyrmion.