Nanotube-Metal Junctions: 2- and 3- Terminal Electrical Transport

Abstract

We address the quality of electrical contact between carbon nanotubes and metallic electrodes by performing first-principles calculations for the electron transmission through ideal 2- and 3-terminal junctions, thus revealing the physical limit of tube-metal conduction. The structural model constructed involves surrounding the tube by the metal atoms of the electrode as in most experiments; we consider metallic (5,5) and n-doped semiconducting (10,0) tubes surrounded by Au or Pd. In the case of metallic tubes, the contact conductance is shown to approach the ideal 4e^2/h in the limit of large contact area. For three-terminals, the division of flux among the different transmission channels depends strongly on the metal material. A Pd electrode has nearly perfect tube-electrode transmission and therefore turns off the straight transport along the tube. Our results are in good agreement with some recent experimental reports and clarify a fundamental discrepancy between theory and experiment.

5 pages, 5 figures, published version: some modified figures and clarifications in the text

References in corpus (6)

• Ballistic Transport in Metallic Nanotubes With Reliable Pd Ohmic Contacts
• Electron Transport Through Molecules: Self-consistent and Non-self-consistent Approaches
• First-principles phase-coherent transport in metallic nanotubes with realistic contacts
• Lateral scaling in carbon nanotube field-effect transistors
• Electrical Nanoprobing of Semiconducting Carbon Nanotubes using an Atomic Force Microscope
• Local gating of carbon nanotubes

Cited by in corpus (3)

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• Modeling extended contacts to nanotube and graphene devices
• Four-Probe Measurements of Carbon Nanotubes with Narrow Metal Contacts