Dynamical Lorentz symmetry breaking in 3D and charge fractionalization
  We analyze the breaking of Lorentz invariance in a 3D model of fermion fields self-coupled through four-fermion interactions. The low-energy limit of the theory contains various sub-models which are similar to those used in the study of the graphene or in the description of irrational charge fractionalization. 
B. Charneski, M. Gomes, T. Mariz, J. R. Nascimento, A. J. da Silva