1202.3574 (Ole Søe Sørensen et al.)

Relative and center-of-mass motion in the attractive Bose-Hubbard model    [PDF]

Ole Søe Sørensen, Søren Gammelmark, Klaus Mølmer

We present first-principle numerical calculations for few particle solutions
of the attractive Bose-Hubbard model with periodic boundary conditions. We show
that the low-energy many-body states found by numerical diagonalization can be
written as translational superposition states of compact composite systems of
particles. These compact states break the translational symmetry of the problem
and their center-of-mass and internal excitations offer simple explanations of
the energy spectrum of the full model.

View original: http://arxiv.org/abs/1202.3574