Ontology type: schema:ScholarlyArticle Open Access: True
2004-05-01
AUTHORSA. Hagen, G. Moos, V. Talalaev, T. Hertel
ABSTRACTWe have studied the electronic structure and charge-carrier dynamics of individual single-wall carbon nanotubes (SWNTs) and nanotube ropes using optical and electron–spectroscopic techniques. The electronic structure of semiconducting SWNTs in the band-gap region is analyzed using near-infrared absorption spectroscopy. A semi-empirical expression for E11S transition energies, based on tight-binding calculations is found to give striking agreement with experimental data. Time-resolved PL from dispersed SWNT-micelles shows a decay with a time constant of about 15 ps. Using time-resolved photoemission we also find that the electron–phonon (e–ph) coupling in metallic tubes is characterized by a very small e–ph mass-enhancement of 0.0004. Ultrafast electron–electron scattering of photo-excited carriers in nanotube ropes is finally found to lead to internal thermalization of the electronic system within about 200 fs. More... »
PAGES1137-1145
http://scigraph.springernature.com/pub.10.1007/s00339-003-2465-1
DOIhttp://dx.doi.org/10.1007/s00339-003-2465-1
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