Coulomb interactions of massless Dirac fermions in graphene; pair-distribution functions and exchange-driven spin-polarized phases
arXiv:cond-mat/0607661 · doi:10.1016/j.ssc.2006.07.044
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.
arXiv comment5 pages, 3 figures, Revtex
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Cited by in corpus (3)
- The ground state of clean and defected graphene: Coulomb interactions of massless Dirac fermions, pair-distribution functions and spin-polarized phases
- Electronic structure and the minimum conductance of a graphene layer on SiO2 from density-functional methods.
- Energy shift of collective modes in spin-imbalanced graphene on SiO from spin-sensitive linear response theory