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Ultrafast Spectroscopy of Mid-Infrared Internal Exciton Transitions of Separated Single-Walled Carbon Nanotubes

We report a femtosecond mid-infrared 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-1D intra-excitonic 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.

preprint2010arXivOpen access
Jigang WangMatt W. GrahamYingzhong MaGraham R. FlemingRobert A. Kaindl
cond-mat.mes-hallcond-mat.mtrl-sci
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Jigang WangMatt W. GrahamYingzhong MaGraham R. FlemingRobert A. Kaindl

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