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IOP Publishing, New Journal of Physics, 4(18), p. 045015, 2016

DOI: 10.1088/1367-2630/18/4/045015

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Topological spin waves in the atomic-scale magnetic skyrmion crystal

Journal article published in 2015 by A. Roldán Molina, A. S. Nunez, J. Fernández Rossier ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We study the spin waves of the triangular skyrmion crystal that emerges in a two-dimensional spin lattice model as a result of the competition between Heisenberg exchange, Dzyalonshinkii-Moriya interactions, Zeeman coupling and uniaxial anisotropy. The calculated spin wave bands have a finite Berry curvature that, in some cases, leads to non-zero Chern numbers, making this system topologically distinct from conventional magnonic systems. We compute the edge spin-waves, expected from the bulk-boundary correspondence principle, and show that they are chiral, which makes them immune to elastic backscattering. Our results illustrate how topological phases can occur in self-generated emergent superlattices at the mesoscale. ; Fondecyt 1150072 Fondo de Innovacion para la Competitividad-MINECON ICM P10-061-F Anillo ACT 1117 Financiamiento Basal para Centros Cientificos y Tecnologicos de Excelencia FB 0807