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Electron-phonon coupling in single-walled carbon nanotubes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Oron-Carl, Matti |
| Copyright Year | 2006 |
| Abstract | The present work investigates the strong electron-phonon coupling processes occurring on the level of individual metallic single-walled carbon nanotubes (SWNTs). In contrast to previous theory, we show that the phonon coupling to the electronic system in individual metallic SWNTs is not due to coupling to low-energy plasmons. This is based on evidence from the measured Raman-Stokes G-mode, which for metallic and semiconducting tubes could be fitted well by the superposition of only two Lorentzian lines associated with vibrational modes along the nanotube axis and the nanotube circumference. In the case of metallic tubes, the lower-energy G-mode is significantly broadened while maintaining the Lorentzian line shape, opposed to the theoretically expected asymmetric Breit-Wigner-Fano line shape from phonon-plasmon coupling. Based on the analysis of the Raman G modes' line shape, an alternative electron-phonon coupling mechanism was proposed. The proposed mechanism is based on results obtained by studying 25 individual metallic and semiconducting SWNTs with atomic force microscopy, electron transport measurements, and resonant Raman spectroscopy. To test the suggested electron-phonon coupling mechanism, a complementary study was performed in which the Raman spectra of metallic SWNTs were investigated under bias. Preliminary results show an increase in the high-energy phonons occupation, i.e., an increase in the intensity of the anti-Stokes G peak. |
| File Format | PDF HTM / HTML |
| Volume Number | 7255 |
| Alternate Webpage(s) | https://publikationen.bibliothek.kit.edu/1000004831/3814858 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
