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arXiv · 0902.2212

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

A. Hubener·M. Snoek·W. Hofstetter
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Abstract

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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A. Hubener, M. Snoek, W. Hofstetter. 2009-12-15. Magnetic phases of two-component ultracold bosons in an optical lattice. https://doi.org/10.1103/physrevb.80.245109

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