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We present direct experimental observation of exciton-phonon bound states inthe photoluminescence excitation spectra of isolated single walled carbonnanotubes in aqueous suspension. The photoluminescence excitation spectra fromseveral distinct single-walled carbon nanotubes show the presence of at leastone sideband related to the tangential modes, lying {200 meV} above the mainabsorption/emission peak. Both the energy position and line shapes of thesidebands are in excellent agreement with recent calculations [PRL {\bf94},027402 (2005)] that predict the existence of exciton-phonon bound states, asizable spectral weight transfer to these exciton-phonon complexes and that theamount of this transfer depends on the specific nanotube structure anddiameter. The observation of these novel exciton-phonon complexes is a strongindication that the optical properties of carbon nanotubes have an excitonicnature and also of the central role played by phonons in describing theexcitation and recombination mechanisms in carbon nanotubes

Direct Experimental Evidence of Exciton-Phonon Bound States in Carbon Nanotubes