Edge State Magnetism of Single Layer Graphene Nanostructures

Details Edge State Magnetism of Single Layer Graphene Nanostructures Edge State Magnetism of Single Layer Graphene Nanostructures

2008-03-28

arxiv.org/abs/0803.4080v2

THE JOURNAL OF CHEMICAL PHYSICS 128, 244717 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.2943678

We study edge state magnetism in graphene nanostructures using a mean field theory of the Hubbard model. We investigate how the magnetism of the zigzag edges of graphene is affected by the presence of other types of terminating edges and defects. By a detailed study of both regular shapes, such as polygonal nanodots and nanoribbons, and irregular shapes, we conclude that the magnetism in zigzag edges is very robust. Our calculations show that the zigzag edges that are longer than three to four repeat units are always magnetic, irrespective of other edges, regular or irregular. We, therefore, clearly demonstrate that the edge irregularities and defects of the bounding edges of graphene nanostructures does not destroy the edge state magnetism.

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