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Electronic structure and dynamics of optically excited single-wall carbon nanotubes

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Hagen,  Axel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Moos,  Gunnar
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Hertel,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Hagen, A., Moos, G., Talalaev, V., & Hertel, T. (2004). Electronic structure and dynamics of optically excited single-wall carbon nanotubes. Applied Physics A: Materials Science & Processing, 78(8), 1137-1145. doi:10.1007/s00339-003-2465-1.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-0D2A-0
Abstract
We 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.