Noncollinear magnetic phases and edge states in graphene quantum Hall bars

J. L. Lado*, J. Fernández-Rossier

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Abstract

Application of a perpendicular magnetic field to charge neutral graphene is expected to result in a variety of broken symmetry phases, including antiferromagnetic, canted, and ferromagnetic. All these phases open a gap in bulk but have very different edge states and noncollinear spin order, recently confirmed experimentally. Here we provide an integrated description of both edge and bulk for the various magnetic phases of graphene Hall bars making use of a noncollinear mean field Hubbard model. Our calculations show that, at the edges, the three types of magnetic order are either enhanced (zigzag) or suppressed (armchair). Interestingly, we find that preformed local moments in zigzag edges interact with the quantum spin Hall like edge states of the ferromagnetic phase and can induce backscattering.

Original languageEnglish
Article number165429
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number16
DOIs
Publication statusPublished - 21 Oct 2014
MoE publication typeA1 Journal article-refereed

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