Effective-mass approach to interaction effects on electronic structure in carbon nanotubes

Effects of Coulomb interaction on the band structure are studied for carbon nanotubes in a random-phase approximation within a View the MathML source scheme. The energy gaps are strongly enhanced due to the interaction, while effects on the effective mass along the axis direction are small. For realistic values of the interaction parameter, the conventional screened Hartree–Fock approximation works quite well.