Electron transport in nanotube--molecular wire hybrids

Details Electron transport in nanotube--molecular wire hybrids Electron transport in nanotube--molecular wire hybrids

2000-08-09

arxiv.org/abs/cond-mat/0008150v1

Physical Review B 63, 045416 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, figures included

Scientific paper

10.1103/PhysRevB.63.045416

We study contact effects on electron transport across a molecular wire sandwiched between two semi-infinite (carbon) nanotube leads as a model for nanoelectrodes. Employing the Landauer scattering matrix approach we find that the conductance is very sensitive to parameters such as the coupling strength and geometry of the contact. The conductance exhibits markedly different behavior in the two limiting scenarios of single contact and multiple contacts between the molecular wire and the nanotube interfacial atoms. In contrast to a single contact the multiple-contact configuration acts as a filter selecting single transport channels. It exhibits a scaling law for the conductance as a function of coupling strength and tube diameter. We also observe an unusual narrow-to-broad-to-narrow behavior of conductance resonances upon decreasing the coupling.

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