2002/06/10 by S. Krompiewski, J. Martinek, J. Barnaś +1
Engineering · Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Graphene research and applications #Molecular Junctions and Nanostructures #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.66.073412
15 pages, 4 figures. To apear in Phys. Rev. B
arxiv created 2002/06/10 · openalex publication_date 2002/08/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In a recent paper Liang et al. [Nature (London) 411, 665 (2001)] showed experimentally, that metallic nanotubes, strongly coupled to external electrodes, may act as coherent molecular wave guides for electronic transport. The experimental results were supported by theoretical analysis based on the scattering matrix approach. In this paper we analyze theoretically this problem using a real-space approach, which makes it possible to control quality of interface contacts. Electronic structure of the nanotube is taken into account within the tight-binding model. External electrodes and the central part (sample) are assumed to be made of carbon nanotubes, while the contacts between electrodes and the sample are modeled by appropriate on-site (diagonal) and hopping (off-diagonal) parameters. Conductance is calculated by the Green function technique combined with the Landauer formalism. In the plots displaying conductance versus bias and gate voltages, we have found typical diamond structure patterns, similar to those observed experimentally. In certain cases, however, we have found new features in the patterns, such as a double-diamond substructure.