Electronic transport properties of cross graphene nano-junction

Graphene nanoribbons have special electrical properties, The electron transport properties can be regulated by controlling their geometry or doping. The metallic properties and semiconductor properties of different chiral graphene nanoribbons are used to build the cross graphene nano-junction in this paper. The method of density functional theory and non-equilibrium Green's function are used to research electronic transport properties of the graphene nano-junction with different heights and widths and locations of doping. It is shown that the graphene nano-junction shows metallic properties with increase in height and width of the arm. But the transmission spectral line has a clear oscillation. Since the doped nitrogen atom intensifies electron scattering, the electronic transport properties decrease. And the electron transport properties when the two arms are doped worsens more compared to the case of trunk doping.