Abstract
The resonant second-order -band Raman spectra of isolated single-wall carbon nanotubes (SWNTs) exhibit an interesting resonance phenomenon, whereby the band for some special isolated SWNTs exhibits a two-peak structure, while for most SWNTs, the -band profile is a single Lorentzian peak. The two-peak phenomenon is explained by combining the double-resonance Raman effect, originally introduced for graphite, with the singular electronic structure of SWNTs, which is unique for a given pair. Therefore, the -band profile is strongly dependent on the joint density of electronic states and provides useful information about the electronic structure and on the assignment for the specific SWNT that is in resonance with the laser.
- Received 23 May 2001
DOI:https://doi.org/10.1103/PhysRevB.65.085417
©2002 American Physical Society