MAGNETIC SUSCEPTIBILITY OF GRAPHENE BY GAUSSIAN CORRECTION

In the present paper, we compute the magnetic susceptibility of graphene by using Gaussian correction. The collective excitations away from Fermi points of graphene are gapless, chiral fermions, with linear dispersion. The system is modeled as N massless Dirac fermions in two spatial dimensions interacting with 1/r Coulomb interactions. We find that the magnetic susceptibility is suppressed by the interaction between these collective excitations. And it has In T correction due to the long-ranged Coulomb interaction, which. is different from Landau Fermi liquid theory.