Electronic structure of boron nitride nanostructures doped with a carbon atom

We have investigated, using first-principles calculations, the role of a substitutional carbon atom on the electronic properties of boron nitride monolayers, nanotubes, and nanocones. It is shown that electron states in the energy-gap are independent of the curvature, being the same for the monolayer, for the cone and for the tube. It is also found, that the presence of carbon in the boron nitride compounds induces a spin polarization, with magnetic moment of 1.0 μ_B, which does not depend on the curvature.