Mott-insulator–to–superfluid transition in Bose-Bose mixtures in a two-dimensional lattice

  title={Mott-insulator–to–superfluid transition in Bose-Bose mixtures in a two-dimensional lattice},
  author={Marco Guglielmino and Vittorio Penna and Barbara Capogrosso-Sansone},
  journal={Physical Review A},
We perform a numeric study (worm algorithm Monte Carlo simulations) of ultracold two-component bosons in two-dimensional optical lattices. We study how the Mott-insulator--to--superfluid transition is affected by the presence of a second superfluid bosonic species. We find that, at fixed interspecies interaction, the upper and lower boundaries of the Mott lobe are differently modified. The lower boundary is strongly renormalized even for relatively low filling factor of the second component and… 

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