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Temperature dependence of the optical excitation lifetime and band gap in chirality assigned semiconducting single-wall carbon nanotubes
- Source :
- Physical Review B. 74
- Publication Year :
- 2006
- Publisher :
- American Physical Society (APS), 2006.
-
Abstract
- The temperature dependence of optical excitation lifetime $1∕\ensuremath{\Gamma}$ and transition energies ${E}_{ii}$ were measured for bucky papers of single-wall carbon nanotubes (SWCNTs) and inner tubes in double-wall carbon nanotubes (DWCNTs) using resonant Raman scattering on the radial breathing mode. The temperature dependence of $\ensuremath{\Gamma}$ and ${E}_{ii}$ is the same for both types of samples and is independent of tube chirality. The data suggest that electron-phonon interaction is responsible for the temperature dependence of ${E}_{ii}$ and $\ensuremath{\Gamma}$. The temperature independent contribution to $\ensuremath{\Gamma}$ is much larger in SWCNT than in DWCNT samples. This is explained by the different nanotube environment in the two types of samples. $\ensuremath{\Gamma}$ for the inner tubes of the DWCNTs is only $\ensuremath{\sim}30\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ below $150\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, which is comparable to that found for individual SWCNTs and is considered as intrinsic to the tubes.
- Subjects :
- Physics
Band gap
Temperature independent
Nanotechnology
Carbon nanotube
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
Optical properties of carbon nanotubes
Condensed Matter::Materials Science
symbols.namesake
law
symbols
Atomic physics
Chirality (chemistry)
Excitation
Raman scattering
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 74
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........46453640af51138425ca9b1997fac2b5