Non-local exchange effects in zigzag edge magnetism of neutral graphene nanoribbons

Details Non-local exchange effects in zigzag edge magnetism of neutral graphene nanoribbons Non-local exchange effects in zigzag edge magnetism of neutral graphene nanoribbons

2011-01-28

arxiv.org/abs/1101.5447v1

Phys. Rev. B 83, 165415 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevB.83.165415

We study the role of non-locality of exchange in a neutral zigzag graphene nanoribbon within the $\pi$-orbital unrestricted Hartree-Fock approximation. Within this theory we find that the magnetic features are further stabilized for both the intra-edge and inter-edge exchange compared to mean field theories of zigzag ribbon based on local exchange (like the Hubbard model or the ab-initio Local Density Approximation). The inter-edge exchange produces an enhancement of the band-gap of the magnetic ground-state solutions. The effect of this enhanced exchange on the edge states can not be satisfactorily achieved by a local interaction with renormalized parameters.

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