Electronic structure calculations of double walled carbon nanotubes using local density functional theory

Findings and conclusions. Electronic structure calculations using local density functional theory are used to study double walled carbon nanotubes. The calculations show that applying small strains to single walled nanotubes in order to form double walled nanotubes has only a minimal effect on the nanotubes. The binding energies of the double walled nanotubes allows an estimation of the minimum inter tube separation distance.