Magnetic phase transitions of spin-1 ultracold bosons in a cubic optical lattice

Abstract

We investigate strongly correlated spin-1 ultracold bosons with antiferromagnetic interactions in a cubic optical lattice, based on bosonic dynamical mean-field theory. Rich phase diagrams of the system are mapped out at both zero and finite temperature, and in particular the existence of a spin-singlet condensate is established. Interestingly, at finite temperature, we find that the superfluid can be heated into a Mott insulator with even (odd) filling via a first- (second-) order phase transition, analogous to the Pomeranchuk effect in ${}^3$He. Moreover, for typical experimental setups, we estimate the critical temperatures for different ordered phases and our results suggest that direct experimental observation of these phases is promising.

5 pages, 3 figures

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• Phase Diagrams of Antiferromagnetic Spin-1 Bosons on Square Optical Lattice with the Quadratic Zeeman Effect
• Spin-Induced Orbital Frustration in a Hexagonal Optical Lattice
• Phase diagrams and multistep condensations of spin-1 bosonic gases in optical lattices
• Spin-1 Bose Hubbard model with nearest neighbour extended interaction
• Magnetisms of spinor alkali and alkaline-earth atoms in optical lattices
• Spin-1 Bose-Hubbard model with two- and three-body interactions
• Spinor bosons in optical superlattices: a numerical study