Eur. Phys. J. B (2013) 86: 22
https://doi.org/10.1140/epjb/e2012-30699-3

Regular Article

Electrical transport properties of a CNT/C₆₀/CNT hybrid junction with closed end CNT leads using Green’s function method

¹ Department of Physics, Payame Noor University, 19395-3697 Tehran, Iran
² Computational Physical Sciences Research Laboratory, School of Nano-Science, Institute for studies in theoretical Physics and Mathematics (IPM) P.O. Box 19395-5531, Tehran, Iran
³ Department of Physics, Amirkabir University of Technology (Tehran Polytechnic), P.O. Box 15875-4413, Tehran, Iran

^a e-mail: aashokri@tpnu.ac.ir

Received: 30 July 2012
Received in final form: 1 November 2012
Published online: 23 January 2013

Abstract

We investigate transport properties of an all-carbon molecular device consisting of a CNT/C₆₀/CNT hybrid system with closed end (5,5) CNT leads. Two different ways of coupling are considered for C₆₀ molecule through one and five atoms to the cap-edges of CNTs. Our calculations are based on the Green’s function method in the nearest neighbor tight-binding approximation in the coherent regime. In this paper, the sensitivity of electron transport on the geometry of the CNT electrodes-C₆₀ interface is shown. Within the framework of the Landauer-Buttiker formalism, the electrical transmission and current-voltage characteristic are calculated at room temperature. We have investigated the effect of a gate voltage on the current in the considered geometry. In the considered structure, the appearance of the conductance resonances is a manifestation of resonant states of CNT caps, which lie within the HOMO-LUMO gap.