| Issue |
Europhys. Lett.
Volume 70, Number 2, April 2005
|
|
|---|---|---|
| Page(s) | 204 - 210 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10482-0 | |
| Published online | 16 March 2005 | |
Conductance gap and zero-bias conductance scaling in metallic carbon nanotubes
1
National Laboratory of Solid State Microstructures Nanjing University - Nanjing 210093, PRC
2
Department of Physics, Xiangtan University Xiangtan 411105, Hunan, PRC
Received:
26
November
2004
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 ![$G=2G_0\exp[-\beta L/d^2]$](/articles/epl/abs/2005/08/epl8692/epl8692_tex_eq1.png)
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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