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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2004.03.08-12

Electron transport in carbon nanotube-metal systems: contact effects

 R. Gutiérrez , N. Ranjan, S. Krompiewski, and G. Cuniberti

Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 2004
German Physical Society, Spring Meeting 2004
(Symposium Organic and Hybrid Systems for Future Electronics)

2004.03.08-12; Regensburg, Germany

Carbon nanotubes (CNT) posses a very large application potential in the rapid developing field of molecular electronics. Infinite single-wall metallic CNTs have theoretically a conductance of 2G0, (G0 = \frac2e2h) because of the two electronic bands crossing the Fermi level. For finite size CNTs experiments have shown that other values are also possible, indicating a very strong influence of the contacts. We study electron transport in single- and double-wall CNTs contacted to metallic electrodes with a fcc(111) surface within the Landauer transport formalism combined with Green function techniques. The electronic structure of the CNTs is described with a simple p-orbital model.We show that the symmetry of the contact region may lead in some cases to blocking of one of the transport channels reducing the conductance to 1G0 for single-wall CNTs. In the case of double-wall systems with both inner and outer shells being metallic, non-diagonal selfenergy contributions from the electrodes may induce mixing of the CNT's channels, again reducing the conductance from the theoretically expected value (4G0). Finally, we discuss the influence of inter-wall interactions on the conductance.

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