The Optical Properties of Single-Walled Carbon Nanotubes in the Ultraviolet Region

The absorption properties of single-walled nanotubes in the ultraviolet (UV) region have been studied using a generalized tight-binding approximation. Calculations indicate that the absorption spectrum in the UV region strongly depends not only on nanotube diameter but also on chiral index. We found a substantial diameter dependence of the UV absorption peaks of the nanotubes with chiral indices of (even, even) and (odd, even). The nanotubes with chiral indices of (even, odd) and (odd, odd) exhibit weak diameter dependence. These spectral features are characteristic of inter-band transitions near the $M$ point of the hexagonal Brillouin zone of graphene. ©2010

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