Stability of attractive bosonic cloud with van der Waals interaction

Abstract

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.

9 pages, 5 figures

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• Use of two-body correlated basis functions with van der Waals interaction to study the shape-independent approximation for a large number of trapped interacting bosons
• Hyperspherical approach to dipolar Bose-Einstein condensates beyond the mean-field limit
• Scaling theory for the collapse of a trapped Bose gas in a synthetic magnetic field: a critical study at the condensation point