Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 53: Focus Session: Topology meets Magnetism

MA 53.1: Invited Talk

Thursday, March 23, 2017, 15:00–15:30, HSZ 01

Topological phases for magnons and electrons in the skyrmion lattice — •Joaquín Fernandez-Rossier — QuantaLab, International Iberian Nanotechnology Laboratory (INL), Braga, Portugal

In this talk I will present two topological phases driven by a skyrmion lattice. First, I will discuss the electronic Quantum Anomalous Hall phase predicted to occur when graphene is placed on top of a triangular skyrmion lattice [1]. Second, I will show that the spin waves associated to a skyrmion lattice have a finite Berry curvature and a non-zero Chern number, forming thereby a phase topologically different from spin waves in conventional ground states [2]. The skyrmion lattice emerges spontaneously as a competition between ferromagnetic exchange, Dzyalonshinkii-Moriya interactions, Zeeman coupling and uniaxial anisotropy in a triangular lattice. I discuss the properties of the resulting topological spin-wave edge states, most notably their unidirectional propagation.

[1] Quantum Anomalous Hall effect in graphene coupled to skyrmions

J. L. Lado , J. Fernandez-Rossier Physical Review B 92, 115433 (2015)

[2] Topological spin waves in the atomic-scale magnetic skyrmion crystal

A. Roldan-Molina, A. S. Nunez, J. Fernandez-Rossier, New Journal of Physics 18, 045015 (2016)