Variational study of Fermi-surface deformations in Hubbard models
  We study the correlation-induced deformation of Fermi surfaces by means of a new diagrammatic method which allows for the analytical evaluation of Gutzwiller wave functions in finite dimensions. In agreement with renormalization-group results we find Pomeranchuk instabilities in two-dimensional Hubbard models for sufficiently large Coulomb interactions. 
J\"org B\"unemann, Tobias Schickling, Florian Gebhard
cond-mat.str-el