Volume 70, Number 2, April 2005
|Page(s)||204 - 210|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||16 March 2005|
Conductance gap and zero-bias conductance scaling in metallic carbon nanotubes
National Laboratory of Solid State Microstructures Nanjing University - Nanjing 210093, PRC
2 Department of Physics, Xiangtan University Xiangtan 411105, Hunan, PRC
Accepted: 28 February 2005
A new supercell approach is presented to the calculations for quantum conductance of single-wall carbon nanotubes as a function of tube length L, diameter d, and chirality. It is shown that there is a conductance gap (dip) in infinite (finite) metallic non-armchair nanotubes due to the curvature-induced energy gap, while it is absent in armchair tubes. This mediates a dispute in experiments. A scaling of is obtained for the zero-bias conductance where and β depends only on the chiral angle. This behavior can be well understood by a proposed tunneling model.
PACS: 61.48.+c – Fullerenes and fullerene-related materials / 71.20.Tx – Fullerenes and related materials; intercalation compounds
© EDP Sciences, 2005
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