Role of Symmetry in the Transport Properties of Graphene Nanoribbons under Bias

Details Role of Symmetry in the Transport Properties of Graphene Nanoribbons under Bias Role of Symmetry in the Transport Properties of Graphene Nanoribbons under Bias

2010-05-02

arxiv.org/abs/1005.0115v1

Physical Review Letters 100 (20), 206802 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.206802

The intrinsic transport properties of zigzag graphene nanoribbons (ZGNRs) are investigated using first principles calculations. It is found that although all ZGNRs have similar metallic band structure, they show distinctly different transport behaviors under bias voltages, depending on whether they are mirror symmetric with respect to the midplane between two edges. Asymmetric ZGNRs behave as conventional conductors with linear current-voltage dependence, while symmetric ZGNRs exhibit unexpected very small currents with the presence of a conductance gap around the Fermi level. This difference is revealed to arise from different coupling between the conducting subbands around the Fermi level, which is dependent on the symmetry of the systems.

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