Defective transport properties of three-terminal carbon nanotube junctions

Abstract

We investigate the transport properties of three terminal carbon based nanojunctions within the scattering matrix approach. The stability of such junctions is subordinated to the presence of nonhexagonal arrangements in the molecular network. Such "defective" arrangements do influence the resulting quantum transport observables, as a consequence of the possibility of acting as pinning centers of the correspondent wavefunction. By investigating a fairly wide class of junctions we have found regular mutual dependencies between such localized states at the carbon network and a strikingly behavior of the conductance. In particular, we have shown that Fano resonances emerge as a natural result of the interference between defective states and the extended continuum background. As a consequence, the currents through the junctions hitting these resonant states might experience variations on a relevant scale with current modulations of up to 75%.

8 pages, 8 figures

References in corpus (6)

• Observation of Fano-Resonances in Single-Wall Carbon Nanotubes
• Fano resonance in crossed carbon nanotubes
• Landauer-type transport theory for interacting quantum wires: Application to carbon nanotube Y junctions
• Tunneling into Multiwalled Carbon Nanotubes: Coulomb Blockade and Fano Resonance
• Fingerprints of mesoscopic leads in the conductance of a molecular wire
• Conduction in Carbon Nanotubes Through Metastable Resonant States

Cited by in corpus (5)

• Controlling the conductance of molecular wires by defect engineering: a divide et impera approach
• Coherent charge transport through molecular wires: influence of strong Coulomb repulsion
• Scaling of the conductance in gold nanotubes
• Molecular electronics in junctions with energy disorder
• Electron transport in crossed nanotubes with point contact