Rectifying performance and negative differential resistance behavior in graphite-chain-nanoribbon junctions
1 Department of Civil and Architectural Engineering, City University of Hong Kong - Kowloon, Hong Kong
2 School of Physics and Electronic Science, Changsha University of Science and Technology - Changsha 410114, PRC
Received: 16 January 2013
Accepted: 10 March 2013
Electronic transport properties of graphite-nanoribbon conjunctions bridged by carbon atomic chains have been investigated. The first-principles calculations show that their I-V characteristics display odd-even effects. Specifically, current in odd-numbered chains is carried by resonances originating from the hybridization of the surface of the graphite electrode, chain and nanoribbon states, while even-numbered chains are mediated by tunneling between the graphite electrode and chain states. The rectifying performance in our models was found to be a result of asymmetric distortions of conducting resonances of the graphite electrode and chain states. It was also found that odd-numbered chains exhibit NDR behaviors caused by depressed chain states.
PACS: 85.65.+h – Molecular electronic devices / 73.63.Nm – Quantum wires / 73.23.-b – Electronic transport in mesoscopic systems
© EPLA, 2013