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Appl. Sci. 2014, 4(3), 351-365; doi:10.3390/app4030351

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

1 Departamento de Física, Universidade Federal do Piauí, CEP 64049-550, Teresina, Piauí, Brazil 2 Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy,NY 12180, USA
* Author to whom correspondence should be addressed.
Received: 16 June 2014 / Revised: 25 July 2014 / Accepted: 28 July 2014 / Published: 18 August 2014
(This article belongs to the Special Issue Towards Applications of Graphene)
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We propose a graphene nanoribbon-based heterojunction, where a defect-free interface separates two zigzag graphene nanoribbons prepared in opposite antiferromagnetic spin configurations. This heterospin junction is found to allow the redirecting of low-energy electrons from one edge to the other. The basic scattering mechanisms and their relation to the system’s geometry are investigated through a combination of Landauer–Green’s function and the S-matrix and eigen-channel methods within a tight-binding + Hubbard model validated with density functional theory. The findings demonstrate the possibility of using zigzag-edged graphene nanoribbons (zGNRs) in complex networks where current can be transmitted across the entire system, instead of following the shortest paths along connected edges belonging to the same sub-lattice.
Keywords: graphene nanoribbons; edge states; quantum transport; Green’s functions graphene nanoribbons; edge states; quantum transport; Green’s functions
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Girão, E.C.; Liang, L.; Meunier, V. Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons. Appl. Sci. 2014, 4, 351-365.

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