Finite temperature phase diagram of spin-1/2 bosons in two-dimensional optical lattice

Abstract

We study a two-species bosonic Hubbard model on a two-dimensional square lattice by means of quantum Monte Carlo simulations and focus on finite temperature effects. We show in two different cases, ferro- and antiferromagnetic spin-spin interactions, that the phase diagram is composed of solid Mott phases, liquid phases and superfluid phases. In the antiferromagnetic case, the superfluid (SF) is polarized while the Mott insulator (MI) and normal Bose liquid (NBL) phases are not. On the other hand, in the ferromagnetic case, none of the phases is polarized. The superfluid-liquid transition is of the Berezinsky-Kosterlitz-Thouless type whereas the solid-liquid passage is a crossover.

9 pages, 13 figures

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Cited by in corpus (8)

• Ultracold bosons with short-range interaction in regular optical lattices
• Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field
• Exotic phases of interacting p-band bosons
• Segregated quantum phases of dipolar bosonic mixtures in two-dimensional optical lattices
• Quantum phases of dipolar bosons in multilayer optical lattice
• Quantum and Thermal Phase Transitions in a Bosonic Atom-Molecule Mixture in a Two-dimensional Optical Lattice
• Bosonic Kondo-Hubbard model
• Staggered quantum phases of dipolar bosons at finite temperatures