Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.177401
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Funding
- Office of Science, U. S. DOE [DE-AC02-05CH11231]
- LDRD
- Ames Laboratory, DOE [DE-AC02-07CH11358]
- NSF
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1012168] Funding Source: National Science Foundation
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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.
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