Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-12-31
Journal of Computational and Theoretical Nanoscience, Volume 7, Number 8, August 2010 , pp. 1368-1374(7)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures
Scientific paper
We explore electron transport properties in honeycomb lattice ribbons with zigzag edges coupled to two semi-infinite one-dimensional metallic electrodes. The calculations are based on the tight-binding model and the Green's function method, which numerically compute the conductance-energy and current-voltage characteristics as functions of the lengths and widths of the ribbons. Our numerical results predict that for such a ribbon an energy gap always appears in the conductance spectrum across the energy E=0. With the increase of the size of the ribbon, the gap gradually decreases but it never vanishes. This clearly manifests that a honeycomb lattice ribbon with zigzag edges always exhibits the semiconducting behavior, and it becomes much more clearly visible from our presented current-voltage characteristics.
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