Single carbon nanotubes probed by photoluminescence excitation spectroscopy: The role of phonon-assisted transitions

H. Htoon, M. J. O'Connell, S. K. Doom, Victor I Klimov

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We study light absorption mechanisms in semiconducting carbon nanotubes using low-temperature, single-nanotube photoluminescence excitation spectroscopy. In addition to purely electronic transitions, we observe several strong phonon-assisted bands due to excitation of one or more phonon modes together with the first electronic state. In contrast with a small width of emission lines (sub-meV to a few meV), most of the photoluminescence excitation features have significant linewidths of tens of meV. All of these observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron-phonon scattering.

Original languageEnglish
Article number127403
JournalPhysical Review Letters
Issue number12
Publication statusPublished - Apr 1 2005


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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