Coulomb interactions of massless Dirac fermions in graphene; pair-distribution functions and exchange-driven spin-polarized phases
Strongly Correlated Electrons
2007-05-23 v1 Mesoscale and Nanoscale Physics
Abstract
The quasi-2D electrons in graphene behave as massless fermions obeying a Dirac-Weyl equation in the low-energy regime near the two Fermi points. The stability of spin-polarized phases (SPP) in graphene is considered. The exchange energy is evaluated from the analytic pair-distribution functions, and the correlation energies are estimated via a closely similar four-component 2D electron fluid which has been investigated previously. SPPs appear for sufficiently high doping, when the exchange energy alone is considered. However, the inclusion of correlations is found to {\it suppress} the spin-phase transition in ideal graphene.
Keywords
Cite
@article{arxiv.cond-mat/0607661,
title = {Coulomb interactions of massless Dirac fermions in graphene; pair-distribution functions and exchange-driven spin-polarized phases},
author = {M. W. C. Dharma-wardana},
journal= {arXiv preprint arXiv:cond-mat/0607661},
year = {2007}
}
Comments
5 pages, 3 figures, Revtex