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

» presentations   » 2004.02.23-27

The influence of the contacts on the electronic transport of finite size carbon nanotubes contacted by metallic electrodes

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

Advances in Molecular Electronics: From molecular materials to single molecule devices

2004.02.23-27; Dresden, Germany

Carbon nanotubes (CNT) posses a very large application potential in molecular electronic devices. Infinite single-wall metallic CNTs have theoretically a conductance of 2 X G0(G0=2e2/h) 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 contact geometry. Here, electronic transport in single and double-wall CNTs contacted by metallic electrodes is studied by combining the Landauer transport formalism with Green function techniques. We demonstrate for some selected nanotubes that the symmetries of the CNT-metall interface may lead to a suppression of the conductance near the Fermi level below the theoretically expected value (2G0 and 4G0 for single and double-wall tubes, respecively). Finally, we also discuss the influence of inter-wall interactions on the conductance and find that it leads to a strong suppression of the transmission, mainly for energies not so close to the Fermi level.

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