Geometry-induced smoothing of van Hove singularities in capped carbon nanotubesD. V. Kolesnikov and V. A. Osipov
Joint Institute for Nuclear Research, Bogoliubov Laboratory of Theoretical Physics - 141980 Dubna Moscow region, Russia
received 22 December 2006; accepted in final form 11 April 2007; published May 2007
published online 10 May 2007
The electronic states of capped semi-infinite nanotubes are studied within the phenomenological gauge field-theory model. A single manifold for the description of both the nanotube and the cap region (considered as nearly a half of either Ih or I fullerene) is suggested. The wave functions and the density of states (DoS) are numerically calculated for both metallic and semiconducting nanotubes. The smoothing of van Hove singularities is found and proven analytically. The comparison with the experimental observations is discussed.
73.22.-f - Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
71.20.Tx - Fullerenes and related materials; intercalation compounds.
73.22.Dj - Single particle states.
© Europhysics Letters Association 2007