Direct experimental evidence of exciton-phonon bound states in carbon nanotubes

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Research areas:
  • Uncategorized
Year: 2005
Type of Publication: Article
Authors:
  • F. Plentz, A. Jorio H. B. Ribeiro
Journal: Physical Review Letters Volume: 95
Number: 24 Pages: 247401
Month: DEC 9 2005
BibTex:
Note:
PT: J; TC: 64; UT: WOS:000233826100068
Abstract:
We present direct experimental observation of exciton-phonon bound states in the photoluminescence excitation spectra of isolated single-walled carbon nanotubes (SWNT) in aqueous suspension. The photoluminescence excitation spectra from several distinct SWNTs show the presence of at least one sideband related to the tangential modes, lying 0.2 eV above the main absorption or emission peak. Both the energy position and line shapes of the sidebands are in excellent agreement with recent calculations [Phys. Rev. Lett. 94, 027402 (2005)] that predict the existence of exciton-phonon bound states, a sizable spectral weight transfer to these exciton-phonon complexes, and that the amount of this transfer depends on the specific nanotube structure and diameter.