Exciton binding energies in carbon nanotubes from two-photon photoluminescence

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Research areas:
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Year: 2005
Type of Publication: Article
Authors:
  • J. Maultzsch, S. Reich R. Pomraenke
Journal: Physical Review B Volume: 72
Number: 24 Pages: 241402
Month: DEC 2005
BibTex:
Note:
PT: J; TC: 234; UT: WOS:000234342900014
Abstract:
Excitonic effects in the linear and nonlinear optical properties of single-walled carbon nanotubes are manifested by photoluminescence excitation experiments and ab initio calculations. One- and two-photon spectra showed a series of exciton states; their energy splitting is the fingerprint of excitonic interactions in carbon nanotubes. By ab initio calculations we determine the energies, wave functions, and symmetries of the excitonic states. Combining experiment and theory we find binding energies of 0.3-0.4 eV for nanotubes with diameters between 6.8 and 9.0 angstrom.