A resonance Raman spectra was observed at the single nanotube level from the same nanotube using different laser energies. The G′ band exhibits a (n,m) dependent frequency dispersion with Elaser, in agreement with the double resonance process in 1D systems. The clear observation of E2 modes means that resonance with Eμ,μ±1 transitions needs to be taken into account when analyzing Raman and optical absorption spectra from isolated single wall carbon nanotubes (SWNTs). This result explains previous controversial polarization studies on aligned SWNT samples, solves open questions related to the resonance nature of the G-band Raman process in SWNTs, and opens up a new perspective for the ability of optical experiments to study electronic dispersion in SWNTs.
|Journal||Physical review letters|
|Publication status||Published - 2003 Mar 14|
ASJC Scopus subject areas
- Physics and Astronomy(all)