We show that D-mode Raman scattering in single-walled carbon nanotubes is due to a double-resonant Raman process. The unusual shift of the D-mode frequency with excitation energy is even expected for a single nanotube. The magnitude of the shift and the D-mode frequency depend strongly on the tube's diameter and chirality. Only tubes with (n₁-n₂)/3n integer contribute to the D-mode spectrum because of the particular electronic structure of carbon nanotubes.
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Maultzsch et al. (2001) studied this question.
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