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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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Prof. Dr. Gianaurelio Cuniberti
secretariat:
postal address:
Institute for Materials Science
TU Dresden
01062 Dresden, Germany
visitors and courier address:
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