Fermionic atoms with tunable interactions in a 3D optical lattice
  We report on the realization of a quantum degenerate atomic Fermi gas in an optical lattice. Fermi surfaces of noninteracting fermions are studied in a three-dimensional lattice. Using a Feshbach resonance, we observe a coupling of the Bloch bands in the strongly interacting regime. 
Thilo St\"oferle, Henning Moritz, Christian Schori, Kenneth G\"unter,   Michael K\"ohl, Tilman Esslinger