Magnetic Response of Single-Walled Carbon Nanotubes Induced by an External Magnetic Field

Using first principles density functional calculations, magnetically induced Currents are Obtained for Zigzag single walled carbon nanotubes. Clear differences and trends in current flow are observed between the different nanotube families. In particilar, for a magnetic field applied along the tube axis, the current response of the lambda = 0 infinite nanotubes is paramagnetic, whereas for lambda = 1 and 2 nanotubes, the response is diamagnetic The results are used to predict and interpret the significant changes in NMR properties for small molecules encapsulated inside a tube.