Theory of excitons in carbon nanotubes

A brief review is given on the electronic and optical properties of carbon nanotubes. The topics include an effective-mass description of the electronic states, optical absorption and excitons, two-photon absorption, excitons in metallic nanotubes, their fine structure and the Aharonov-Bohm effect, and exciton absorption for perpendicular polarization. Copyright line will be provided by the publisher 1 Introduction Carbon nanotubes (CN) are either a metal or semiconductor, depending on their diameters and helical arrangement. This condition can be obtained based on the band structure of a two-dimensional (2D) graphite sheet and periodic boundary conditions along the circum