  Recent experiments involving tilted graphene samples have shown evidence of a
continuous phase transition in the $\nu=0$ quantum Hall bulk state. We present
here a simple model that supports such a transition. In addition to a long
range SU(4) symmetric Coulomb interaction, we include Hubbard on-site and
nearest neighbor interactions with tunable coupling strengths, and perform a
self-consistent Hartree-Fock analysis. A large sea of negative energy Landau
levels is retained, and is shown to have important qualitative and quantitative
effects. Phase diagrams are constructed within the space of physically relevant
parameters, yielding results consistent with experimental observation.
