Bound excitons and optical absorption spectra of (10,10) metallic single-walled carbon nanotubes

ORAL

Abstract

Motivated by recent theoretical prediction of bound excitons [1] in small diameter metallic single-walled carbon nanotubes, we study the optical spectra of the larger diameter (10,10) metallic tube. We use an interacting-particle Green’s function approach which includes calculations of the quasiparticle excitation spectrum (within the GW approximation for the electron self energy) and the electron-hole excitation spectrum (within the Bethe-Salpeter formalism). We show that the (10,10) tube has important excitonic effects despite being a metal, due to the quasi-one dimensional nature of the carbon nanotubes. A bound exciton with binding energy of ~60 meV is found, and the location of the excitonic peak in the optical spectrum is at 1.8 eV. [1] C. D. Spataru, S. Ismail-Beigi, L. X. Benedict, and S. G. Louie, Phys. Rev. Lett. 92, 077402 (2004).

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Authors

  • Jack Deslippe

    University of California at Berkeley

  • Catalin Spataru

    UC Berkeley and LBNL, Berkeley, CA 94704

  • Steven Louie

    Department of Physics, University of California, Berkeley \& The Molecular Foundry, Materials Sciences Division,Lawrence Berkeley National Laboratory, University of California at Berkeley and Lawrence Berkeley National Laboratory, UC Berkeley and Lawrence Berkeley National Laboratory, Department of Physics, University of California at Berkeley and Materials Sciences Division, LBNL, Dept of Physics, UC Berkeley, The Molecular Foundry, LBNL, University of California at Berkeley, Department of Physics, University of California at Berkeley and Materials Sciences Divisions, LBNL