Phase dynamics after connection of two separate Bose-Einstein condensates

Details Phase dynamics after connection of two separate Bose-Einstein condensates Phase dynamics after connection of two separate Bose-Einstein condensates

2002-12-26

arxiv.org/abs/cond-mat/0212604v1

Physics

Condensed Matter

4 pages, 1 figure, submitted to Physical Review A

Scientific paper

10.1103/PhysRevA.67.021603

We study the dynamics of the relative phase following the connection of two independently formed Bose-Einstein condensates. Dissipation is assumed to be due to the creation of quasiparticles induced by a fluctuating condensate particle number. The coherence between different values of the phase, which is characteristic of the initial Fock state, is quickly lost after the net exchange of a few atoms has taken place. This process effectively measures the phase and marks the onset of a semiclassical regime in which the system undergoes Bloch oscillations around the initial particle number. These fast oscillations excite quasiparticles within each condensate and the system relaxes at a longer time scale until it displays low-energy, damped Josephson plasma oscillations, eventually coming to a halt when the equilibrium configuration is finally reached.

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