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Critical temperature of interacting Bose gases in periodic potentials

Nguyen, T. T. ; Herrmann, Andreas Johannes ; Troyer, Matthias ; Pilati, S.

In: Physical Review Letters, 2014, vol. 112, no. 17, p. 170402

The superfluid transition of a repulsive Bose gas in the presence of a sinusoidal potential which represents a simple-cubic optical lattice is investigated using quantum Monte Carlo simulations. At the average filling of one particle per well the critical temperature has a nonmonotonic dependence on the interaction strength, with an initial sharp increase and a rapid suppression at strong...