Energy states in metallic nanotubes
The one-dimensional density of states for (8,8), (9,9), (10,10), and (11,11) armchair nanotubes show discrete peaks at the positions of the one-dimensional band maxima or minima. For these metallic nanotubes, the density of states is non-zero at E = 0. Optical transitions can occur between mirror-image spikes, such as A ® B.