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Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes

TitleUltrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes
Publication TypeJournal Article
Year of Publication2010
AuthorsWang JG, Graham MW, Ma YZ, Fleming GR, Kaindl RA
Journal TitlePhysical Review Letters
Volume104
Pages177401
Date Published04/30
ISBN Number0031-9007
Accession NumberISI:000277210600047
Keywordscarrier dynamics, photophysics
Abstract

We report a femtosecond midinfrared study of the broadband low-energy response of individually separated ( 6,5) and ( 7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement, and dynamics manifest the observation of quasi-one-dimensional intraexcitonic transitions. A model of the nanotube 1s-2p cross section agrees well with the signal amplitudes. Our study further reveals saturation of the photoinduced absorption with increasing phase-space filling of the correlated e-h pairs.
URL<Go to ISI>://000277210600047