Direct measurement of the lifetime of optical phonons in single-walled carbon nanotubes
| Autor: | Ming Zheng, Louis E. Brus, Gordana Dukovic, E. D. Semke, Daohua Song, Feng Wang, Tony F. Heinz |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Phonon Anharmonicity General Physics and Astronomy Carbon nanotube Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Coupling (probability) law.invention Optical properties of carbon nanotubes Condensed Matter::Materials Science symbols.namesake Nuclear magnetic resonance law Femtosecond symbols Atomic physics Raman spectroscopy Excitation |
| Zdroj: | Physical review letters. 100(22) |
| ISSN: | 0031-9007 |
| Popis: | Time-resolved anti-Stokes Raman spectroscopy has been applied to probe the dynamics of optical phonons created in single-walled carbon nanotubes by femtosecond laser excitation. From measurement of the decay of the anti-Stokes Raman signal in semiconducting nanotubes of $(6,5)$ chiral index, a room-temperature lifetime for $G$-mode phonons of $1.1\ifmmode\pm\else\textpm\fi{}0.2\text{ }\text{ }\mathrm{ps}$ has been determined. This lifetime, which reflects the anharmonic coupling of the $G$-mode phonons to lower-frequency phonons, is important in assessing the role of nonequilibrium phonon populations in high-field transport phenomena. |
| Databáze: | OpenAIRE |
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