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Paper   IPM / P / 8415
School of Physics
  Title:   Chirality and Correlations in Graphene
1.  Y. Barlas
2.  T. Pereg-Barnea
3.  M . Polini
4.  R. Asgari
5.  A.H. MacDonald
  Status:   Published
  Journal: Phys. Rev. Lett.
  Vol.:  98
  Year:  2007
  Pages:   236601
  Supported by:  IPM
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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