Numerical simulation of electronic transport in zigzag-edged graphene nano-ribbon devices

作者：Souma Satofumi^*; Ogawa Matsuto; Yamamoto Takahiro; Watanabe Kazuyuki

来源：Journal of Computational Electronics, 2008, 7(3): 390-393.

DOI：10.1007/s10825-008-0237-z

• Quantum transport
• Non-equilibrium Green's function
• Graphene

We present a numerical study of the current-voltage characteristics in zigzag-edged graphene nano-ribbon (Z-GNR) devices. Our calculations employing the non-equilibrium Green's function method and the density-functional tight-binding method show that the Z-GNR with transverse symmetry can exhibit remarkable current saturation behavior in spite of the absence of the bandgap. We further demonstrate that the saturation current can be controlled by the additional doping in the channel region. The mechanism of such current saturation can be explained in terms of the symmetry of the wavefunctions corresponding to the conduction and the valence bands in Z-GNR.

• 出版日期2008-9