Interband Recombination Dynamics in Resonantly-Excited Single-Walled Carbon Nanotubes

Wavelength-dependent pump-probe spectroscopy of micelle-suspended single-walled carbon nanotubes reveals two-component dynamics. The slow component (5-20 ps), which has not been observed previously, is resonantly enhanced whenever the pump photon energy coincides with an absorption peak and we attri...

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Bibliographic Details
Published inarXiv.org
Main Authors Ostojic, G N, Zaric, S, Kono, J, Strano, M S, Moore, V C, Hauge, R H, Smalley, R E
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.01.2004
Subjects
Absorption
Carrier recombination
Doping
Micelles
Nanotubes
Single wall carbon nanotubes
Tubes
Valence band
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Summary:Wavelength-dependent pump-probe spectroscopy of micelle-suspended single-walled carbon nanotubes reveals two-component dynamics. The slow component (5-20 ps), which has not been observed previously, is resonantly enhanced whenever the pump photon energy coincides with an absorption peak and we attribute it to interband carrier recombination, whereas we interpret the always-present fast component (0.3-1.2 ps) as intraband carrier relaxation in non-resonantly excited nanotubes. The slow component decreases drastically with decreasing pH (or increasing H\(^+\) doping), especially in large-diameter tubes. This can be explained as a consequence of the disappearance of absorption peaks at high doping due to the entrance of the Fermi energy into the valence band, i.e., a 1-D manifestation of the Burstein-Moss effect.
ISSN:2331-8422
DOI:10.48550/arxiv.0307154