Ultrafast spectroscopy of midinfrared internal exciton transitions in separated single-walled carbon nanotubes

Jigang Wang, Matt W. Graham, Yingzhong Ma, Graham R. Fleming, Robert A. Kaindl

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

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.

Original languageEnglish (US)
Article number177401
JournalPhysical Review Letters
Volume104
Issue number17
DOIs
StatePublished - Apr 26 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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