Journal article

Critical temperature of interacting Bose gases in periodic potentials

  • Nguyen, T.  T. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy - SISSA—International School for Advanced Studies, Trieste, Italy
  • Herrmann, Andreas J. Department of Physics, University of Fribourg, Switzerland
  • Troyer, Matthias Theoretische Physik, ETH Zurich, Switzerland
  • Pilati, S. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy
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Published in:
  • Physical Review Letters. - 2014, vol. 112, no. 17, p. 170402
English 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 interactions in the vicinity of the Mott transition. In an optical lattice the positive shift of the transition is strongly enhanced compared to the homogenous gas. By varying the lattice filling we find a crossover from a regime where the optical lattice has the dominant effect to a regime where interactions dominate and the presence of the lattice potential becomes almost irrelevant.
Faculté des sciences et de médecine
Département de Physique
  • English
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