Antiferromagnetism in a bosonic mixture of rubidium (${}^{87}$Rb) and potassium (${}^{41}$K)

Abstract

We simulate the experimental possibility of observing the antiferromagnetic (AF) order in the bosonic mixtures of rubidium (${}^{87}$Rb) and potassium (${}^{41}$K) in a two-dimensional optical lattice in the presence of harmonic confinement. By tuning the interspecies interactions and the lattice heights we have found the ground states, within the mean-field approximation, that interpolate from the phase separation to the AF order. For a moderate lattice height the coexistence of the Mott and AF phase is possible for the Rb atoms while the K atoms remain in the AF-superfluid phase. This observation may provide an experimental feasibility to hitherto unobserved AF order for ${}^{87}$Rb - ${}^{41}$K mixture.

4 pages, 4 figures, accepted for PRA rapid communication

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• Anisotropic pair-superfluidity of trapped two-component Bose gases
• Quantum crystal growing: Adiabatic preparation of a bosonic antiferromagnet in the presence of a parabolic inhomogeneity
• Miscibility-Immiscibility transition of strongly interacting bosonic mixtures in optical lattices