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



Thursday, 11 March 2004
(at 18:00 in room B)
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Electron transport in carbon nanotube-metal systems: contact effects

Rafael Gutierrez

ITP
Universitaet 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 2×G0, (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 1×G0 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 (4×G0). Finally, we discuss the influence of inter-wall interactions on the conductance.



abstract (html)

Within the DPG Frühjahrstagung 2004 (German Physical Society, Spring Meeting 2004)

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