Asymmetric transport in asymmetric T-shaped graphene nanoribbons

We propose an asymmetric T-shaped graphene nanoribbon (TGNR) that shows peculiar transport properties. In the vicinity of the Fermi level, the electron transmissions from the vertical graphene nanoribbon (GNR) to the two ends of the horizontal GNR are highly asymmetric. The electrons mostly transmit to one horizontal arm while are blocked by the other one. It is originated from the local asymmetric couplings between the intersection of the junction and the two horizontal arms. The asymmetric transport is very robust, even the T-shaped junction has a large size. Thus the asymmetric TGNR can be served as important components of nanocircuits. (c) 2008 American Institute of Physics.