Tuning the Electronic and Transport Properties of Gated Graphene Based Device

In this paper, it is presented how the electronic and transport properties of graphene nanoribbon device are affected by changing terminal or electrode voltages of 1 and 2volt respectively. It is revealed that terminal voltage has a significant effect on the transmission spectrum and device density of states which is reflected in the I-V characteristics. Apart from it, the low-energy electronic states of graphene device have two non-equivalent sampling spectra with effective mass equals to zero. The comparative distance between these two k points in the momentum space due to the existence of zigzag-type graphene at the electrodes is a deciding factor in the electronic and transport properties of graphene device. In graphene device with zigzag nanoribbons at the terminal region, there are two troughs in relation to each sampling spectrum which are quite good separation in momentum space. There are propagating modes in each trough which forms a conducting channel.While armchair nanoribbon in the central region has the superposition of two sampling points.