Dipolar Stabilization of an Attractive Bose Gas in a One Dimensional   Lattice
  We experimentally show that dipolar interaction can stabilize otherwise unstable many-body systems like an attractive Bose gas. In a one dimensional lattice the repulsive dipolar on-site interaction balances negative scattering lengths up to -17 Bohr radii and stabilizes the chromium Bose-Einstein condensate. For reduced lattice depths, the dipolar stabilization turns into destabilization. We probe the full cross-over between the two regimes and our results are in excellent agreement with theoretical calculations, which reveal significant dipolar inter-site interactions. 
S. M\"uller, J. Billy, E. A. L. Henn, H. Kadau, A. Griesmaier, M.   Jona-Lasinio, L. Santos, and T. Pfau
cond-mat.quant-gas