Bandgap modulation of narrow-gap carbon nanotubes in a transverse electric field

Details Bandgap modulation of narrow-gap carbon nanotubes in a transverse electric field Bandgap modulation of narrow-gap carbon nanotubes in a transverse electric field

2005-10-18

arxiv.org/abs/cond-mat/0510480v2

Europhys. Lett., 73 (5), pp. 759-764 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 2 figures, accepted to Europhysics Letters

Scientific paper

10.1209/epl/i2005-10446-x

We propose a method to modulate the bandgaps in quasi-metallic carbon nanotubes using a transverse electric field. Unlike previous investigations, we include curvature effects of the nanotubes by incorporating both $\pi$- and $\sigma$-orbitals in our tight-binding calculations. The calculations show that the small curvature-induced bandgaps decrease quadratically with electric field amplitude to zero. As the electric field amplitude continues to increase, the bandgap then expands in a similar manner to that presented in earlier studies. The bandgap dependence is verified by analytical calculations, which also agree with preceding analyses for the limit of no curvature.

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