Stability of attractive bosonic cloud with van der Waals interaction

Physics – Condensed Matter – Quantum Gases

Scientific paper

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9 pages, 5 figures

Scientific paper

10.1103/PhysRevA.82.043607

We investigate the structure and stability of Bose-Einstein condensate of $^{7}$Li atoms with realistic van der Waals interaction by using the potential harmonic expansion method. Besides the known low-density metastable solution with contact delta function interaction, we find a stable branch at a higher density which corresponds to the formation of an atomic cluster. Comparison with the results of non-local effective interaction is also presented. We analyze the effect of trap size on the transition between the two branches of solutions. We also compute the loss rate of a Bose condensate due to two- and three-body collisions.

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