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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 (CC BY 3.0).

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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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