Mott Insulator to Superfluid transition in Bose-Bose mixtures in a two-dimensional lattice

Details Mott Insulator to Superfluid transition in Bose-Bose mixtures in a two-dimensional lattice Mott Insulator to Superfluid transition in Bose-Bose mixtures in a two-dimensional lattice

2010-05-04

arxiv.org/abs/1005.0463v2

Phys. Rev. A 82, 021601(R) (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures, accepted as PRA Rapid Communication

Scientific paper

10.1103/PhysRevA.82.021601

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 moderate (interspecies) interaction. The upper boundary, instead, is affected only for large enough filling of the second component. Whereas boundaries are renormalized we find evidence of polaron-like excitations. Our results are of interest for current experimental setups.

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