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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 and to enhanced quasiparticle velocities.
Our conclusions are based on an evaluation of graphene's exchange
and random-phase-approximation (RPA) correlation energies.
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