WIDTH OF THE FORBIDDEN GAP IN CHIRAL CARBON NANOTUBES
In the framework of the density functional theory, ab initio calculations of the electronic properties of 8 semiconductor chiral carbon nanotubes were performed. The obtained calculated values of the energy gaps E<sub>g</sub> are surprisingly accurately described by the analytical expression given in the article for chiral carbon nanotubes. A comparison of our results with all the available experimental data was done. Overall, a good agreement is obtained between them.