Abstract Submitted to the NANOTUBE-99 Workshop:

At any metal-carbon nanotube interface there is charge transfer and induced interfacial field which determines the position of the carbon nanotube band structure relative to the metal Fermi-level. In the case of a single-wall carbon nanotube (SWNT) supported on the gold substrate, such charge transfers are shown to induce a local electrostatic potential perturbation which shifts the energy levels of carbon nanotube relative to the Fermi-level of the gold substrate. The observed Fermi-level shift in the scanning tunneling spectroscopy (STS) measurement is explained in term of this interfacial potential perturbation. We also discuss the relevance of this study to recent experiments on the transport property of carbon nanotube transistors and argue that for measurements using low resistance contacts, the Fermi-level should be ``pinned'' around the mid-gap position of the semiconducting carbon nanotubes.

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