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- W2073487285 abstract "How doping and defects alter linewidths and lifetimes of $G$-band optical phonons, in carbon nanotubes is examined. Optical phonon lifetimes, ${T}_{1}$, in thin films of nanotubes are measured by time-resolved incoherent anti-Stokes Raman spectroscopy and considered along with Raman linewidths of isolated individual nanotubes. Within the doping range achievable in nanotube films in this study, ${T}_{1}$ does not appear to change. A varying degree of doping in individual nanotubes by means of electrostatic gating reveals decreasing full-width at half-maximum ensuremath{Gamma} down to ensuremath{sim}4 ${mathit{cm}}^{ensuremath{-}1}$ at the charge neutrality point. Increasing disorder, on the other hand, leads to a decrease in ${T}_{1}$ along with an increase in ensuremath{Gamma}. We observe a decrease in ${T}_{1}$ of ensuremath{sim}0.4 ps at an estimated effective crystallite size ${L}_{a}$ ensuremath{sim} 130 nm based on the $D$-band to $G$-band peak intensity ratio. In the limit of zero doping and zero defects, the measured ensuremath{Gamma} of single semiconducting nanotubes coincides with a lifetime broadening of ensuremath{sim}4 ${mathit{cm}}^{ensuremath{-}1}$ based on a measured ${T}_{1}$ of 1.2 ps. Samples displaying different degree of metallic or semiconducting contributions in their static Raman spectrum are also compared and are shown to exhibit similar values of ${T}_{1}$." @default.
- W2073487285 created "2016-06-24" @default.
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- W2073487285 date "2011-05-20" @default.
- W2073487285 modified "2023-09-26" @default.
- W2073487285 title "Influence of defects and doping on optical phonon lifetime and Raman linewidth in carbon nanotubes" @default.
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- W2073487285 doi "https://doi.org/10.1103/physrevb.83.205419" @default.
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