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We report the first observation of an optical transition from a ground trionstate T to excited trion state T* in (6,5) single-wall carbon nanotubesnon-covalently doped with hydrochloric acid. The position of such an excitedtrion level T* is estimated as 2,12 eV, while the ground trion level T has anenergy of 1,08 eV. Besides, pump-probe transient absorption spectroscopyindicates that the ground trion level T cannot be excited directly. Instead, wepropose that trions form after nonradioactive relaxation from excitons, dressedby interaction with doping induced hole-polarons. We also report a completeexciton-to-trion conversion by means of photoluminescence spectroscopy, thussupporting existence of the polaron-dressed exciton energy level in p-dopedsingle-wall carbon nanotubes.

Spectroscopic signatures of many-particle energy levels in non-covalently doped single-wall carbon nanotubes