Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-06-27
Molecular Physics, vol. 109, issues 23-24, pp. 2737-2745 (2011)
Physics
Condensed Matter
Quantum Gases
13 pages, 8 figures, accepted for publication in Molecular Physics, special issue "Luciano Reatto Festschrift" [LS thanks Luci
Scientific paper
10.1080/00268976.2011.602370
We study effects of tunnel coupling on a pair of parallel disk-shaped Bose-Einstein condensates with the self-attractive intrinsic nonlinearity. Each condensate is trapped in a combination of in-plane and transverse harmonic-oscillator potentials. It is shown that, depending on the self-interaction strength and tunneling coupling, the ground state of the system exhibits a phase transition which links three configurations: a symmetric one with equal numbers of atoms in the coupled condensates, an asymmetric configuration with a population imbalance (a manifestation of the macroscopic quantum self-trapping), and the collapsing state. A modification of the phase diagram of the system in the presence of vortices in the disk-shaped condensates is reported too. The study of dynamics around the stationary configurations reveals properties which strongly depend on the symmetry of the configuration.
Malomed Boris A.
Salasnich Luca
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