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Effect of bending and vacancies on the conductance of carbon nanotubes
University of Kalmar, School of Pure and Applied Natural Sciences.
2000 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 62, no 11, p. 7639-7644Article in journal (Refereed) Published
Abstract [en]

Electron transport through nanotubes is studied theoretically using the Landauer formalism. The studies are carried out for finite metallic nanotubes that bridge two contacts pads. The current is observed to increase stepwise with the applied voltage. Each step corresponds to resonance tunneling including one single-particle eigenstate of the nanotube. Moderate bending of the nanotube results in a shift of the single-particle levels but the overall current remains essentially unaffected. For large bending, however, the pi electron system becomes more disturbed, which introduces backscattering and a marked decrease in the conductivity along the tube. A single carbon vacancy in the nanotube is shown to have very small effect on the conductivity in the center of the metallic band whereas, by increasing the defect concentration the conductivity decreases in the same way as for the strongly bent tubes.

Place, publisher, year, edition, pages
2000. Vol. 62, no 11, p. 7639-7644
National Category
Physical Sciences
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-2369DOI: 10.1103/PhysRevB.62.7639OAI: oai:DiVA.org:lnu-2369DiVA, id: diva2:309458
Available from: 2010-04-07 Created: 2010-04-07 Last updated: 2017-12-12Bibliographically approved

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Paulsson, Magnus

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