Artículos de revistas
Topological spin waves in the atomic-scale magnetic skyrmion crystal
Fecha
2016Registro en:
New J. Phys. 18 (2016) 045015
10.1088/1367-2630/18/4/045015
Autor
Roldán Molina, A.
Núñez Vásquez, Álvaro
Fernández Rossier, J.
Institución
Resumen
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.