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

@article{Guglielmino2010MottinsulatortosuperfluidTI,
  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},
  year={2010},
  volume={82},
  pages={021601}
}
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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References

SHOWING 1-10 OF 53 REFERENCES
Transition from a strongly interacting 1d superfluid to a Mott insulator.
TLDR
Signs for increased fluctuations characteristic for 1D trapped Bose gases are observed and the collective oscillations cease near the transition to the Mott insulator phase.
Mott-insulator transition in a two-dimensional atomic Bose gas.
TLDR
The 2D Bose-Hubbard model is realized by loading a Bose/Einstein condensate into an optical lattice, and the resulting Mott insulator is studied to show a marked dependence on the lattice depth.
Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3D optical lattice.
TLDR
Through an analysis of the 87Rb momentum distribution, a pronounced asymmetry between strong repulsion and strong attraction is found, which is attributed to a renormalization of the Bose-Hubbard parameters due to self-trapping.
One-dimensional Bose-Fermi-Hubbard model in the heavy-fermion limit
We study the phase diagram of the zero-temperature, one-dimensional Bose-Fermi-Hubbard model for fixed fermion density in the limit of small fermionic hopping. This model can be regarded as an
Counterflow superfluidity of two-species ultracold atoms in a commensurate optical lattice.
TLDR
In the Mott-insulator regime, two species of ultracold atoms in an optical lattice can exhibit the low-energy counterflow motion and a crucial role of breaking the isotopic symmetry between the species for realizing the SCF phase is emphasized.
Superfluidity of interacting bosonic mixtures in optical lattices.
TLDR
Near the superfluid-to-Mott insulator transition for one component, the presence of a second component can reduce the apparent superfluid coherence, most significantly when the second component either experiences a strongly localizing lattice potential or none at all.
Phase diagram and thermodynamics of the three-dimensional Bose-Hubbard model
We report results of quantum Monte Carlo simulations of the Bose-Hubbard model in three dimensions. Critical parameters for the superfluid-to-Mott-insulator transition are determined with
Monte Carlo study of the two-dimensional Bose-Hubbard model
One of the most promising applications of ultracold gases in optical lattices is the possibility to use them as quantum emulators of more complex condensed matter systems. We provide benchmark
Fermion-mediated long-range interactions of bosons in the one-dimensional Bose-Fermi-Hubbard model
The ground-state phase diagram of mixtures of spin polarized fermions and bosons in a 1D periodic lattice is discussed in the limit of large fermion hopping and half filling of the fermions.
Supersolidity of cold-atom Bose-Fermi mixtures in optical lattices
We investigate a cold atomic mixture of spinless bosons and fermions in two-dimensional optical lattices. In the presence of a nested Fermi surface, the bosons may develop a fascinating supersolid
...
1
2
3
4
5
...