  Graphene is described at low-energy by a massless Dirac equation whose
eigenstates have definite chirality. We show that the tendency of Coulomb
interactions in lightly doped graphene to favor states with larger net
chirality leads to suppressed spin and charge susceptibilities. Our conclusions
are based on an evaluation of graphene's exchange and
random-phase-approximation (RPA) correlation energies. The suppression is a
consequence of the quasiparticle chirality switch which enhances quasiparticle
velocities near the Dirac point.
