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We report the first high-field magneto-optical study on the exciton-phononsideband of single-walled carbon nanotubes (SWNTs) consisting only of (6,5)species. Both energy and intensity of the observed phonon sideband were foundto be independent of the external magnetic field. Comparing with theoreticalcalculations, we confirmed that these sidebands originate from the opticallyforbidden K-momentum singlet excitons. Energy of these K-momentum dark excitonswas extracted to be ~ 21.5 meV above the bright zero-momentum singlet excitons,in close agreement with recent theoretical predictions and experimentallydetermined values.

Survey of Exciton-Phonon Sidebands by Magneto-optical Spectroscopy Using Highly Purified (6,5) Single-walled Carbon Nanotubes