We analyze the dependence of the second-order G’-band profile in terms of their (n,m) indices by measuring the resonance Raman spectra of several semiconducting and metalic isolated single wal carbon nanotubes. We show that this profile is very sensitive to the electronic structure, thus making it possible to get structural (n,m) information and to probe the splitting of the van Hove singularities in the electronic density of states due to the trigona warping effect.
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Filho, A.G.S., Joribo, A., Dresselhaus, G. et al. Dependence of the Second-order G’-band Profile on the Electronic Structure of Single-wal Nanotubes. MRS Online Proceedings Library 706, 6171 (2001). https://doi.org/10.1557/PROC-706-Z6.17.1