Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-01-30
Phys. Rev. B 79, 201403(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 1 figure; version published on Phys. Rev. B; erratum added
Scientific paper
We consider the 2D Hubbard model on the honeycomb lattice, as a model for single layer graphene with screened Coulomb interactions; at half filling and weak coupling, we construct its ground state correlations by a convergent multiscale expansion, rigorously excluding the presence of magnetic or superconducting instabilities or the formation of a mass gap. The Fermi velocity, which can be written in terms of a convergent series expansion, remains close to its non-interacting value and turns out to be isotropic. On the contrary, the interaction produces an asymmetry between the two components of the charge velocity, in contrast with the predictions based on relativistic or continuum approximations.
Giuliani Alessandro
Mastropietro Vieri
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