Superfluidity of strongly correlated bosons in two- and   three-dimensional traps
  We analyze the superfluid phase transition of harmonically confined bosons with long-range interaction in both two and three dimensions in a broad parameter range from weak to strong coupling. We observe that the onset of superfluidity occurs in $3D$ at significantly lower temperatures compared to $2D$. This is demonstrated to be a quantum degeneracy effect. In addition, the spatial distribution of superfluidity across the shells of the clusters is investigated. It is found that superfluidity is substantially reduced in the outer layers due to increased correlation effects. 
T. Dornheim, A. Filinov, and M. Bonitz
cond-mat.quant-gas physics.plasm-ph