Theory of interedge superexchange in zigzag edge magnetism

J. Jung, T. Pereg-Barnea, A. H. MacDonald

Research output: Contribution to journalArticlepeer-review

140 Scopus citations

Abstract

A graphene nanoribbon with zigzag edges has a gapped magnetic ground state with an antiferromagnetic interedge superexchange interaction. We present a theory based on asymptotic properties of the Dirac-model ribbon wave function which predicts W-2 and W-1 ribbon-width dependencies for the superexchange interaction strength and the charge gap, respectively. We find that, unlike the case of conventional atomic-scale superexchange, opposite spin orientations on opposite edges of the ribbon are favored by both kinetic and interaction energies.

Original languageEnglish
Article number227205
JournalPhysical Review Letters
Volume102
Issue number22
DOIs
StatePublished - 5 Jun 2009

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