Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-25
Solid State Communications 140, 4-8 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures, Revtex
Scientific paper
10.1016/j.ssc.2006.07.044
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.
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