The inter-π-band response function of a single-layer carbon nanotube is calculated within the random-phase approximation. Such a cylindrical system exhibits rich inter-π-band excitations. The decoupled π plasmons of different angular momenta (L’s) strongly depend on the transferred momenta (q’s). Furthermore, they exhibit a dimensionality crossover as the nanotube radius is increased. For small q’s and L’s, the π plasmon frequency is ∼6-8 eV, which is insensitive to the nanotube geometry such as the radius and chiral angle. Comparison with recent experiments is discussed.
|頁（從 - 到）||15493-15496|
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 1996|
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