Screw current in a single-walled carbon nanotube with chirality
Institute for structure and function and Department of Physics, Chongqing University - Chongqing 400030, China
Corresponding author: email@example.com
Accepted: 15 December 2009
A Dirac-type theory of the π-electrons near the band edges has been presented for singe-walled carbon nanotubes (SWCNT) with arbitrary chirality. The effects of the tubule size, chirality and fine structure are included through effective metric and gauge potential. The violation of in-plane isotropy has been calculated explicitly for two most favorite models. In particular, the screw current in a chiral nanotube has been discussed in relax-time approximation. It is found that the ratio of the currents along the circumference and the axis is a very small constant, which only depends on the chiral angle and diameter. For a SWCNT with diameter 1nm, if the current is 1mA, the strength of magnetic field induced by the screw current in the tube is just several Gauss.
PACS: 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 61.46.Fg – Structure of nanoscale materials: Nanotubes / 73.63.Fg – Electronic transport in nanoscale materials and structures: Nanotubes
© EPLA, 2010