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Controllable magnetic correlation between two impurities by spin-orbit coupling in graphene.

Authors
Type
Published Article
Journal
Scientific Reports
2045-2322
Publisher
Nature Publishing Group
Publication Date
Volume
5
Pages
8943–8943
Identifiers
DOI: 10.1038/srep08943
PMID: 25754911
Source
Medline

Abstract

Two magnetic impurities on the edge of a zigzag graphene nanoribbon strongly interact with each other via indirect coupling, which can be mediated by conducting carriers. By means of Quantum Monte Carlo (QMC) simulations, we find that the spin-orbit coupling λ and the chemical potential μ in system can be used to drive the transition of local-spin exchange from ferromagnetism to anti-ferromagnetism. Since the tunable ranges for λ and μ in graphene are experimentally reachable, we thus open the possibilities for its device application. The symmetry in spatial distribution is broken by the vertical and the transversal spin-spin correlations due to the effect of spin-orbit coupling, leading to the spatial anisotropy of spin exchange, which distinguish our findings from the case in normal Fermi liquid.

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