1205.6484 (Juan Carrasquilla et al.)

Superfluid to normal phase transition in strongly correlated bosons in
two and three dimensions    [PDF]

Juan Carrasquilla, Marcos Rigol

Using quantum Monte Carlo simulations, we investigate the finite-temperature phase diagram of hard-core bosons (XY model) in two- and three-dimensional lattices. To determine the phase boundaries, we perform a finite-size-scaling analysis of the condensate fraction and/or the superfluid stiffness. We then discuss how these phase diagrams can be measured in experiments with trapped ultracold gases, where the systems are inhomogeneous. For that, we introduce a method based on the measurement of the zero-momentum occupation, which is adequate for experiments dealing with both homogeneous and trapped systems, and compare it with previously proposed approaches.

View original: http://arxiv.org/abs/1205.6484