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Phys Rev Lett. 2007 Jun 8;98(23):236601. Epub 2007 Jun 5.

Chirality and correlations in graphene.

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Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA.


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 correlation energies. The suppression is a consequence of the quasiparticle chirality switch which enhances quasiparticle velocities near the Dirac point.

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