Single carbon nanotubes probed by photoluminescence excitation spectroscopy: the role of phonon-assisted transitions.
Phys Rev Lett
; 94(12): 127403, 2005 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-15903961
ABSTRACT
We study light absorption mechanisms in semiconducting carbon nanotubes using low-temperature, single-nanotube photoluminescence excitation spectroscopy. In addition to purely electronic transitions, we observe several strong phonon-assisted bands due to excitation of one or more phonon modes together with the first electronic state. In contrast with a small width of emission lines (sub-meV to a few meV), most of the photoluminescence excitation features have significant linewidths of tens of meV. All of these observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron-phonon scattering.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nanotubos de Carbono
/
Medições Luminescentes
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article