Electron correlation effects on the femtosecond dephasing dynamics of e 22 excitons in (6,5) carbon nanotubes

J. R. Schneck, A. G. Walsh, A. A. Green, Mark C Hersam, L. D. Ziegler, A. K. Swan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Highly nonlinear pump fluence dependence was observed in the ultrafast one-color pump - probe responses excited by 38 fs pulses resonant with the E22 transition in a room-temperature solution of (6,5) carbon nanotubes. The differential probe transmission (Î"T/T) at the peak of the pump - probe response (π = 20 fs) was measured for pump fluences from ̃1013 to 1017 photons/pulse cm2. The onset of saturation is observed at ̃2 - 1015 photons/pulse cm 2 (̃8 - 105 excitons/cm). At pump fluences >4 - 1016 photons/pulse cm2 (̃1.6 - 106 excitons/cm), Î"T/T decreases as the pump fluence increases. Analogous signal saturation behavior was observed for all measured probe delays. Despite the high exciton density at saturation, no change in the E22 population decay rate was observed at short times (- 1), and the derived E22 inhomogeneous width is 68 meV (545 cm- 1). These results are contrasted with photon-echo-derived parameters for the E11 transition.

Original languageEnglish
Pages (from-to)3917-3923
Number of pages7
JournalJournal of Physical Chemistry A
Volume115
Issue number16
DOIs
Publication statusPublished - Apr 28 2011

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Electron correlations
Carbon Nanotubes
carbon nanotubes
excitons
Pumps
pumps
fluence
Photons
electrons
probes
photons
pulses
saturation
decay rates
LDS 751
echoes
Color
color
room temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Electron correlation effects on the femtosecond dephasing dynamics of e 22 excitons in (6,5) carbon nanotubes. / Schneck, J. R.; Walsh, A. G.; Green, A. A.; Hersam, Mark C; Ziegler, L. D.; Swan, A. K.

In: Journal of Physical Chemistry A, Vol. 115, No. 16, 28.04.2011, p. 3917-3923.

Research output: Contribution to journalArticle

Schneck, J. R. ; Walsh, A. G. ; Green, A. A. ; Hersam, Mark C ; Ziegler, L. D. ; Swan, A. K. / Electron correlation effects on the femtosecond dephasing dynamics of e 22 excitons in (6,5) carbon nanotubes. In: Journal of Physical Chemistry A. 2011 ; Vol. 115, No. 16. pp. 3917-3923.
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