Quantum anomalous Hall effect in graphene coupled to skyrmions

J. L. Lado, J. Fernández-Rossier

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Skyrmions are topologically protected spin textures, characterized by a topological winding number N, that occur spontaneously in some magnetic materials. Recent experiments have demonstrated the capability to grow graphene on top Fe/Ir, a system that exhibits a two-dimensional skyrmion lattice. Here we show that a weak exchange coupling between the Dirac electrons in graphene and a two-dimensional skyrmion lattice with N=±1 drives graphene into a quantum anomalous Hall phase, with a band gap in bulk, a Chern number C=2N, and chiral edge states with perfect quantization of conductance G=2Ne2h. Our findings imply that the topological properties of the skyrmion lattice can be imprinted in the Dirac electrons of graphene.

Original languageEnglish
Article number115433
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number11
DOIs
Publication statusPublished - 21 Sep 2015
MoE publication typeA1 Journal article-refereed

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