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- W3100205553 abstract "In a system of ac-driven condensed bosons we study a new type of Josephson effect occurring between states sharing the same region of space and the same internal atom structure. We first develop a technique to calculate the long time dynamics of a driven interacting many-body system. For resonant frequencies, this dynamics can be shown to derive from an effective time-independent Hamiltonian which is expressed in terms of standard creation and annihilation operators. Within the subspace of resonant states, and if the undriven states are plane waves, a locally repulsive interaction between bosons translates into an effective attraction. We apply the method to study the effect of interactions on the coherent ratchet current of an asymmetrically driven boson system. We find a wealth of dynamical regimes which includes Rabi oscillations, self-trapping, and chaotic behavior. In the latter case, a full many-body calculation deviates from the mean-field results by predicting large quantum fluctuations of the relative particle number." @default.
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- W3100205553 date "2012-07-26" @default.
- W3100205553 modified "2023-10-12" @default.
- W3100205553 title "Orbital Josephson effect and interactions in driven atom condensates on a ring" @default.
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- W3100205553 doi "https://doi.org/10.1088/1367-2630/14/7/075023" @default.
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