Interaction-driven Lifshitz transition with dipolar fermions in optical   lattices
  Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition -- so-called Lifshitz transition -- in the regime accessible to present-day experiments. We describe the impact of the Lifshitz transition on observable quantities such as the Fermi surface topology, the density-density correlation function, and the excitation spectrum of the system. The Lifshitz transition in ultracold atoms can be controlled by tuning the dipole orientation and -- in contrast to the transition studied in crystalline solids -- is completely interaction-driven. 
E. G. C. P. van Loon and M. I. Katsnelson and L. Chomaz and M.   Lemeshko
cond-mat.quant-gas cond-mat.str-el physics.atom-ph