Temperature dependence of electron-to-lattice energy transfer in single-wall carbon nanotube bundles.
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(Te, Tl), the rate of energy transfer between the electronic system and the lattice as a function of electron and lattice temperatures Te and Tl. The experiments are consistent with a T5 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 of for lambda/[symbol: see text] D2, where [symbol: see text] 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.
Moos
Gunnar
G
Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany.
Fasel
Roman
R
Hertel
Tobias
T
D003198:Computer Simulation; D003461:Crystallography / Q000379:methods*; D004583:Electrons; D004735:Energy Transfer; D046911:Macromolecular Substances; D008422:Materials Testing / Q000379:methods; D008956:Models, Chemical; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods; D013696:Temperature
D046911:Macromolecular Substances; D037742:Nanotubes, Carbon