Abstract
A review of the electronic dipole transitions in graphite and
single-wall carbon nanotubes is presented. Because of its singular
electronic structure, the optical absorption matrix element as a
function of wave vector has a node in the two-dimensional Brillouin zone
of graphite, which depends linearly on the optical polarization
direction. In the case of the single-wall carbon nanotubes, the dipole
selection rule and the van Hove singularity in the joint density of
states will give a characteristic behavior, which is observed by
luminescence and resonance Raman spectroscopy.
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