Abstract Submitted to the NANOTUBE-99 Workshop:

We have studied the electron-electron (e-e) and electron-phonon (e-ph) dynamics in single wall carbon nanotube samples (buckypaper) using time-resolved two-photon photoemission. The absorption of an 80fs visible pump pulse excites a nonequilibrium electron distribution whose evolution in time is probed by a second UV-pulse. The relaxation of the excited electrons is characterized by a slow and a fast process on the sub-picosecond and the picosecond timescales respectively. The fast process strongly depends on the electron energy with respect to the Fermi level and may be attributed to e-e scattering events which lead to a rapid thermalization of the nonequilibrium electron distribution. The thermalized electron distribution then cools down to the lattice temperature by e-ph interaction which accounts for the slow component of the relaxation dynamics. From the evolution of the electron gas temperature we can estimate the electron-phonon coupling parameter G to be (1.410.5)x10¹⁴ W/m³ K.

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