Solitons in tunnel-coupled repulsive and attractive condensates

Details Solitons in tunnel-coupled repulsive and attractive condensates Solitons in tunnel-coupled repulsive and attractive condensates

2003-11-16

arxiv.org/abs/cond-mat/0311368v2

Phys. Rev. A 69, 033609 (2004)

Physics

Condensed Matter

Soft Condensed Matter

LaTex, 23 pages, 6 figures; revised version; to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.69.033609

We study solitons in the condensate trapped in a double-well potential with far-separated wells, when the s-wave scattering length has different signs in the two parts of the condensate. By employing the coupled-mode approximation it is shown that there are unusual stable bright solitons in the condensate, with the larger share of atoms being gathered in the repulsive part. Such unusual solitons derive their stability from the quantum tunneling and correspond to the strong coupling between the parts of the condensate. The ground state of the system, however, corresponds to weak coupling between the condensate parts, with the larger share of atoms being gathered in the attractive part of the condensate.

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