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Phys Rev Lett. 2004 Feb 20;92(7):077402. Epub 2004 Feb 20.

Excitonic effects and optical spectra of single-walled carbon nanotubes.

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1
Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA.

Abstract

Many-electron effects often dramatically modify the properties of reduced dimensional systems. We report calculations, based on an ab initio many-electron Green's function approach, of electron-hole interaction effects on the optical spectra of small-diameter single-walled carbon nanotubes. Excitonic effects qualitatively alter the optical spectra of both semiconducting and metallic tubes. Excitons are bound by approximately 1 eV in the semiconducting (8,0) tube and by approximately 100 meV in the metallic (3,3) tube. These large many-electron effects explain the discrepancies between previous theories and experiments.

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