ABSTRACT
Carbon nanotubes have attracted a lot of experimental and theoretical researches since their first discovery by S. Iijima in 1991, mainly owing to the nanoscale radius and hollow cylindrical symmetry. The 1D carbon nanotubes exhibit rich and unique electronic & magne-toelectronic properties, in which they are further classified into three types according to the concise relation between nanotube geometry and energy gap. A uniform magnetic field can diversify the electronic structures of carbon nanotubes. The low-frequency electronic excitations are greatly diversified by three types of carbon nanotubes. The temperature dependence of Coulomb excitations in pristine carbon nanotubes is worthy of a closer examination. In addition to a single-walled carbon nanotube, the p-electronic excitations have been thoroughly investigated for a multiwall carbon nanotube, single-walled carbon nanotube bundle with a finite number, and the graphitic systems with any layers. The magneto-Coulomb excitations are rich and unique in 1D nanotube and 2.
