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  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper EG_P3

Exciton dynamics in (6,5) single-walled carbon nanotubes studied with sub-20 fs pump-probe spectroscopy

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Abstract

Using femtosecond pump probe spectroscopy with sub-20 fs resolution, we probe fundamental properties of the E11 exciton in (6,5) single walled carbon nanotubes, prepared by density gradient ultracentrifugation [1]. From the initial photobleaching (PB) signal, measured faster than any relaxation process, we obtain the one-dimensional electron-hole correlation length ("exciton size") of the excitonic wavefunction along the nanotube. Anisotropy measurements in highly purified samples show that there is virtually no depolarisation of the E11 bleach over 40 ps. A photoinduced absorption (PA) band, blueshifted against the E11 bleach, shows only weak anisotropy. We discuss the origin of this PA band.

© 2009 IEEE

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