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• W2000823086 abstract "We analyze the dynamical and energetic instabilities of spin currents in a system of two-component bosons in an optical lattice, with a particular focus on the N'eel state. We consider both the weakly interacting superfluid and the strongly interacting Mott insulating limits as well as the regime near the superfluid-insulator transition and establish the criteria for the onset of these instabilities. We use Bogoliubov theory to treat the weakly interacting superfluid regime. Near the Mott transition, we calculate the stability phase diagram within a variational Gutzwiller wave-function approach. In the deep Mott limit we discuss the emergence of the Heisenberg model and calculate the stability diagram within this model. Though the Bogoliubov theory and the Heisenberg model (appropriate for the deep superfluid and the deep Mott-insulating phase, respectively) predict no dynamical instabilities, we find, interestingly, that between these two limiting cases there is a regime of dynamical instability. This result is relevant for the ongoing experimental efforts to realize a stable N'eel-ordered state in multicomponent ultracold bosons." @default.
• W2000823086 created "2016-06-24" @default.
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• W2000823086 date "2011-10-11" @default.
• W2000823086 modified "2023-10-16" @default.
• W2000823086 title "Instabilities of bosonic spin currents in optical lattices" @default.
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• W2000823086 doi "https://doi.org/10.1103/physreva.84.043615" @default.
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