Magnetic phases of two-component ultracold bosons in an optical lattice

Details Magnetic phases of two-component ultracold bosons in an optical lattice Magnetic phases of two-component ultracold bosons in an optical lattice

2009-02-12

arxiv.org/abs/0902.2212v3

Phys. Rev. B 80, 245109 (2009)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 4 figures, revised and published version

Scientific paper

10.1103/PhysRevB.80.245109

We investigate spin-order of ultracold bosons in an optical lattice by means of Dynamical Mean-Field Theory. A rich phase diagram with anisotropic magnetic order is found, both for the ground state and at finite temperatures. Within the Mott insulator, a ferromagnetic to antiferromagnetic transition can be tuned using a spin-dependent optical lattice. In addition we find a supersolid phase, in which superfluidity coexists with antiferromagnetic spin order. We present detailed phase diagrams at finite temperature for the experimentally realized heteronuclear 87Rb - 41K mixture in a three-dimensional optical lattice.

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