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Abstract: We study dynamical and energetic instabilities in the transport properties ofBloch waves for atomic multi-component Bose-Einstein condensates in opticallattices in the tight-binding limit. We obtain stability criteria analytically,as a function of superfluid velocities and interaction parameters, in severalcases for two-component and spinor condensates. In the two-species case we findthat the presence of the other condensate component can stabilize thesuperfluid flow of an otherwise unstable condensate and that the free spacedynamical miscibility condition of the two species can be reversed by tuningthe superfluid flow velocities. In spin-1 condensates, we find the steady-stateBloch wave solutions and characterize their stability criteria. We findgenerally more regions of dynamical instability arise for the polar than forthe ferromagnetic solutions. In the presence of magnetic Zeeman shifts, we finda richer variety of condensate solutions and find that the linear Zeeman shiftcan stabilize the superfluid flow in several cases of interest.



Author: J. Ruostekoski, Zachary Dutton

Source: https://arxiv.org/







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