Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-03-15
Nanotechnology 23 (2012) 135203
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 4 figures
Scientific paper
10.1088/0957-4484/23/13/135203
Carbon-based nanostructures and graphene, in particular, evoke a lot of interest as new promising materials for nanoelectronics and spintronics. One of the most important issue in this context is the impact of external electrodes on electronic properties of graphene nanoribbons (GNR). The present theoretical method is based on the tight-binding model and a modified recursive procedure for Green's functions. The results show that within the ballistic transport regime, the so called end-contacted geometry (of minimal GNR/electrode interface area), is usually more advantageous for practical applications than its side-contacted counterpart (with a larger coverage area), as far as the electrical conductivity is concerned. As regards the giant magnetoresistance coefficient, however, the situation is exactly opposite, since spin- splitting effects are more pronounced in the lower conductive side-contacted setups.
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