Chirality and Correlations in Graphene

Yafis Barlas, T. Pereg-Barnea, Marco Polini, Reza Asgari, and A. H. MacDonald
Phys. Rev. Lett. 98, 236601 – Published 5 June 2007

Abstract

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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  • Received 11 January 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.236601

©2007 American Physical Society

Authors & Affiliations

Yafis Barlas1, T. Pereg-Barnea1, Marco Polini2, Reza Asgari3, and A. H. MacDonald1

  • 1Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
  • 2NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy
  • 3Institute for Studies in Theoretical Physics and Mathematics, Tehran 19395-5531, Iran

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Issue

Vol. 98, Iss. 23 — 8 June 2007

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