Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-07-24
J. Phys. A: Math. Theor. 42 (2009) 285307
Physics
Condensed Matter
Quantum Gases
25 pages, 12 figures
Scientific paper
10.1088/1751-8113/42/28/285307
We study the dynamical stability of the macroscopic quantum oscillations characterizing a system of three coupled Bose-Einstein condensates arranged into an open-chain geometry. The boson interaction, the hopping amplitude and the central-well relative depth are regarded as adjustable parameters. After deriving the stability diagrams of the system, we identify three mechanisms to realize the transition from an unstable to stable behavior and analyze specific configurations that, by suitably tuning the model parameters, give rise to macroscopic effects which are expected to be accessible to experimental observation. Also, we pinpoint a system regime that realizes a Josephson-junction-like effect. In this regime the system configuration do not depend on the model interaction parameters, and the population oscillation amplitude is related to the condensate-phase difference. This fact makes possible estimating the latter quantity, since the measure of the oscillating amplitudes is experimentally accessible.
Buonsante Pierfrancesco
Franzosi Roberto
Penna Vittorio
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