Spin Versus Charge Density Wave Order in Graphene-like Systems
arXiv:1204.4531 · doi:10.1103/PhysRevB.86.121402
Abstract
A variational technique is used to study sublattice symmetry breaking by strong on-site and nearest neighbor interactions in graphene. When interactions are strong enough to break sublattice symmetry, and with relative strengths characteristic of graphene, a charge density wave Mott insulator is favored over the spin density wave condensates. In the spin density wave condensate we find that introduction of a staggered on-site energy (quasiparticle mass) leads to a splitting of the fermi velocities and mass gaps of the quasiparticle spin states.
5 pages, 4 figures; some comments added
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