Exact diagonalization of the one dimensional Bose-Hubbard model with   local 3-body interactions
  In this Brief Report the extended Bose-Hubbard model with local two- and three-body interactions is studied by the exact diagonalization approach. The shapes of the first two insulating lobes are discussed and the values of the critical tunneling for which the insulating phase loses stability for repulsive and attractive three-body interactions are predicted. 
Tomasz Sowinski
cond-mat.str-el quant-ph