Rectifying and successive switch behaviors induced by weak intermolecular interaction

By applying nonequilibrium Green's functions in combination with density-function theory, we investigate the effect of the weak intermolecular interaction on electronic transport properties in a bilayer graphene nanoribbon device. The results show that a successive switch behavior can be realized by adjusting the weak pi-pi interaction between two graphene nanoribbon molecules. Moreover, rectifying behavior can be observed in such systems. The mechanisms for these phenomena are suggested. (C) 2011 Elsevier B.V. All rights reserved.