Orbital physics of polar Fermi molecules
  We study a system of polar dipolar fermions in a two-dimensional optical lattice and show that multi-band Fermi-Hubbard model is necessary to discuss such system. By taking into account both on-site, and long-range interactions between different bands, as well as occupation-dependent inter- and intra-band tunneling, we predict appearance of novel phases in the strongly-interacting limit. 
O. Dutta, T. Sowi\'nski, M. Lewenstein
cond-mat.quant-gas quant-ph