Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-07
Nanotechnology, 21, 205306 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 9 figures
Scientific paper
Using non-equilibrium Green's function formalism, we investigate nonlinear transport and charging effects of gated graphene nanoribbons (GNRs) with even number of zigzag chains. We find a negative differential resistance (NDR) over a wide range of gate voltages with on/off ratio $\sim 10^6$ for narrow enough ribbons. This NDR originates from the parity selection rule and also prohibition of transport between discontinues energy bands. Since the external field is well screened close to the contacts, the NDR is robust against the electrostatic potential. However, for voltages higher than the NDR threshold, due to charge transfer through the edges of ZGNR, screening is reduced such that the external potential can penetrate inside the ribbon giving rise to smaller values of off current. Furthermore, on/off ratio of the current depends on the aspect ratio of the length/width and also edge impurity. Moreover, on/off ratio displays a power law behavior as a function of ribbon length.
Cheraghchi Hosein
Esmailzade Hanyieh
No associations
LandOfFree
A Gate-Induced Switch in Zigzag Graphene Naoribbons and Charging Effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Gate-Induced Switch in Zigzag Graphene Naoribbons and Charging Effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Gate-Induced Switch in Zigzag Graphene Naoribbons and Charging Effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-485571