title: Exciton states and optical properties of carbon nanotubes.
abstract: Exciton states and related optical properties of a single-walled carbon nanotube are reviewed, primarily from a theoretical viewpoint. The energies and wavefunctions of excitons are discussed using a screened Hartree-Fock approximation with an effective-mass or k·p approximation. The close relationship between a long-range electron-hole exchange interaction and a depolarization effect is clarified. I discuss optical properties including the radiative lifetime of excitons, absorption spectra and radiation force. To describe these properties in a unified scheme, a self-consistent method is introduced for calculating the scattering light and induced current density due to excitons. I also briefly review experimental results on the Aharonov-Bohm effect in excitons and quasi-dark excitons excited by light polarized perpendicular to the tube axis.
authors.affiliation: Photon Pioneers Center, Osaka University, Suita, Osaka, Japan. ajiki@ppc.osaka-u.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ajiki