Excitons in carbon nanotubes: Diameter and chirality trends


  • Rodrigo B. Capaz,

    Corresponding author
    1. Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil
    2. Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial – Inmetro, R. Nossa Senhora das Graças 50, Xerém, Duque de Caxias, RJ 25245-020, Brazil
    • Phone: +55 21 2562 7331, Fax: +55 21 2562 7368
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  • Catalin D. Spataru,

    1. Center for Integrated Science and Engineering and Center for Electron Transport in Molecular Nanostructures, Columbia University, New York, NY 10027, USA
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  • Sohrab Ismail-Beigi,

    1. Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
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  • Steven G. Louie

    1. Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA
    2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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We provide a closer look into the diameter and chirality dependences of exciton properties in carbon nanotubes, using a variational methodology based on the effective mass and envelope function approximations, supported by ab initio parameters. Experimental measurements of the binding energy are reproduced within 0.02 eV for a large variety of tubes. We also report on the singlet-triplet energy splittings, which show a 1/d2 diameter dependence. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)