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• W3098042018 abstract "The time-dependent non-equilibrium dynamics of a Bose-Einstein condensate (BEC) typically generates incoherent excitations out of the condensate due to the finite frequencies present in the time evolution. We present a detailed derivation of a general non-equilibrium Green's function technique which describes the coupled time evolution of an interacting BEC and its single-particle excitations in a trap, based on an expansion in terms of the exact eigenstates of the trap potential. We analyze the dynamics of a Bose system in a small double-well potential with initially all particles in the condensate. When the trap frequency is larger than the Josephson frequency, $Delta > omega_J$, the dynamics changes at a characteristic time $tau_c$ abruptly from slow Josephson oscillations of the BEC to fast Rabi oscillations driven by quasiparticle excitations in the trap. For times $t<tau_c$ the Josephson oscillations are undamped, in agreement with experiments. We analyze the physical origin of the finite scale $tau_c$ as well as its dependence on the trap parameter $Delta$." @default.
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• W3098042018 date "2015-01-09" @default.
• W3098042018 modified "2023-09-26" @default.
• W3098042018 title "Temporal non-equilibrium dynamics of a Bose–Josephson junction in presence of incoherent excitations" @default.
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• W3098042018 doi "https://doi.org/10.1088/1367-2630/17/1/013006" @default.
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