Physics – Condensed Matter – Materials Science
Scientific paper
2002-09-05
Physics
Condensed Matter
Materials Science
5 pages, 4 figures, submitted to the Journal of Nanoscience and Nanotechnologiy, special issue on nanotubes
Scientific paper
The electron-phonon coupling strength in single-wall carbon nanotube (SWNT) bundles has been studied directly in the time-domain by femtosecond time-resolved photoelectron spectroscopy. We have measured the dependence of H(T_e,T_l), the rate of energy-transfer between the electronic system and the lattice as a function of electron and lattice temperatures T_e and T_l. The experiments are consistent with a T^5 dependence of H on the electron- and lattice-temperatures, respectively. The results can be related to the e-ph mass enhancement parameter lambda. The experimentally obtained value for lambda/theta_D^2, where theta_D is the Debye temperature, suggests that e-ph scattering times at the Fermi level of SWNT bundles can be exceptionally long, exceeding 1.5 ps at room temperature.
Fasel Roman
Hertel Tobias
Moos Gunnar
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