Author/Authors :
Souza Filho، نويسنده , , A.G and Jorio، نويسنده , , A and Samsonidze، نويسنده , , Ge.G and Dresselhaus، نويسنده , , G and Dresselhaus، نويسنده , , M.S and Swan، نويسنده , , Anna K and ـnlü، نويسنده , , M.S and Goldberg، نويسنده , , B.B and Saito، نويسنده , , R and Hafner، نويسنده , , J.H and Lieber، نويسنده , , C.M and Pimenta، نويسنده , , M.A، نويسنده ,
Abstract :
We have studied the trigonal warping effect in metallic carbon nanotubes using resonance Raman scattering and examining the G′-band profile for individual metallic single-wall carbon nanotubes. We show that the observed splitting in the G′-band phonon spectra is directly correlated with the splitting in the singularities of the joint density of electronic states, i.e., detailed information about the 1D electronic structure is extracted from a phonon measurement. By correlating the phonon data with the calculated electronic structure for several (n,m) nanotubes, we were able to determine the G′-band dispersion [(∂ωG′/∂Elaser)=108±6 cm−1/eV] by using a single laser energy.
