Journal
NEW JOURNAL OF PHYSICS
Volume 18, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/4/045015
Keywords
topological magnonics; skyrmion lattice; spin waves
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Funding
- 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]
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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.
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