In-Plane Edge Magnetism in Graphene-Like Nanoribbons
S. Krompiewskia and G. Cuniberti b
aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 PoznaƄ, Poland
bTU Dresden, 01062 Dresden, Germany: Institute for Materials Science and Max Bergmann Center of Biomaterials;, Center for Advancing Electronics Dresden; and Dresden Center for Computational Materials Science (DCMS)
Full Text PDF
This paper is devoted to identification of the most important factors responsible for formation of magnetic moments at edges of graphene-like nanoribbons. The main role is attributed to the Hubbard correlations (within unrestricted Hartree-Fock approximation) and intrinsic spin-orbit interactions, but additionally a perpendicular electric field is also taken into account. Of particular interest is the interplay of the in-plane edge magnetism and the energy band gap. It is shown that, with the increasing electric field, typically the following phases develop: magnetic insulator (with in-plane spins), nonmagnetic narrow-band semiconductor, and nonmagnetic band insulator.

DOI: 10.12693/APhysPolA.131.828
PACS numbers: 75.75.-c, 75.30.Gw, 61.48.Gh