Chirality and Correlations in Graphene

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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. 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.
5 pages, 4 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/130370

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0701257
 http://arxiv.org/abs/cond-mat/0701257
 Phys.Rev.Lett,98,236601(2007)
 doi:10.1103/PhysRevLett.98.236601

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arXiv