Ground-state properties of a trapped few-boson system under rotation: beyond the 'lowest-Landau-level' approximation

We consider a harmonically trapped few-boson system under rotation and investigate the ground-state properties beyond the usual 'lowest-Landau-level' approximation by using exact diagonalizations in a restricted Hilbert subspace. We find that both the effective interaction energy and density distribution are strongly affected by the two-body interaction strength.