Carbon Nanotubes: Revolutionary Nanowires with a Twist
aNaval Research Laboratory,
Washington, DC 20375 USA
bDepartment of Physics, Oklahoma State University
This is an abstract
for a presentation given at the
Foresight Conference on Molecular Nanotechnology.
There will be a link from here to the full article when it is
available on the web.
Metallic single-walled carbon nanotubes (SWNTs) do not behave like normal metallic wires. In normal metallic wires the number of open conduction channels (states at the Fermi level) will increase as the cross-section of the wire increases. In contrast, the number of channels available for conduction in metallic SWNTs is independent of the tube's diameter . We will discuss how this key property of metallic SWNTs allows them to avoid the spontaneous symmetry breaking that converts other potentially excellent metallic nanowires into semiconductors . We will also discuss how this property is central to the ability of metallic and semimetallic SWNTs to sustain ballistic transport over unprecedented distances for such laterally confined systems in the presence of residual chemical and structural disorder . Thus, it is the fixed number of states at the Fermi level, which when combined with their mechanical and chemical stability and the strong C-C interactions along the tube, that makes metallic and semimetallic SWNTs strong candidates for the ultimate one-dimensional conductors for use in nanoscale devices. Finally, we touch upon recent results that indicate that semimetallic nanotubes will find use as electromechanical gauges.
- J.W. Mintmire, B.I. Dunlap, and C.T. White, Phys. Rev. Lett. 68, 631 (1992).
- C.T. White and T.N. Todorov, Nature 393, 240 (1998); Nature 411, 649 (2001).
Carter T. White
Naval Research Laboratory, Code 6189
4555 Overlook Ave. S.W., Washington, DC 20375 USA
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