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Tunable Resistance of a Carbon Nanotube-Graphite Interface

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Science  01 Dec 2000:
Vol. 290, Issue 5497, pp. 1742-1744
DOI: 10.1126/science.290.5497.1742

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Abstract

The transfer of electrons from one material to another is usually described in terms of energy conservation, with no attention being paid to momentum conservation. Here we present results on the junction resistance between a carbon nanotube and a graphite substrate and show that details of momentum conservation also can change the contact resistance. By changing the angular alignment of the atomic lattices, we found that contact resistance varied by more than an order of magnitude in a controlled and reproducible fashion, indicating that momentum conservation, in addition to energy conservation, can dictate the junction resistance in graphene systems such as carbon nanotube junctions and devices.

  • * Present address: Department of Physics and Center for Nonlinear and Complex Systems, Duke University, Durham, NC 27708, USA.

  • To whom correspondence should be addressed. E-mail: falvo{at}physics.unc.edu

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