Journal
PHYSICAL REVIEW B
Volume 65, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.65.165433
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The behavior of the disorder-induced D band in the Raman spectrum of single-wall carbon nanotubes (SWCNT's) was investigated both theoretically and experimentally. The measured maximum position of the D band for SWCNT bundles exhibits an oscillation superimposed on a linear shift, when the laser excitation energy E-laser varies in the range of 1.6-2.8 eV. We have shown theoretically by explicit integrations for the resonant Raman cross section that the D-band intensity of an isolated SWCNT has a sharp maximum when E-laser of either the incoming or the scattered photon matches a van Hove singularity in the joint density of states. This resonance must be considered in addition to the double resonance from a scattering by an impurity. Calculating the D band of a superposition of all the 114 SWCNT's within a given diameter range, both the shift and the oscillation in the experimentally observed spectra were reproduced.
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