Oscillating Solitons and ac Josephson Effect in Ferromagnetic Bose-Bose Mixtures
S. Bresolin, A. Roy, G. Ferrari, A. Recati, N. Pavloff
DOI 10.1103/PhysRevLett.130.220403 · Physical Review Letters
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Abstract
Close to the demixing transition, the degree of freedom associated with relative density fluctuations of a two-component Bose-Einstein condensate is described by a nondissipative Landau-Lifshitz equation. In the quasi-one-dimensional weakly immiscible case, this mapping surprisingly predicts that a dark-bright soliton should oscillate when subject to a constant force favoring separation of the two components. We propose a realistic experimental implementation of this phenomenon which we interpret as a spin-Josephson effect in the presence of a movable barrier.
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