Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions

Details Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions

2000-04-17

arxiv.org/abs/cond-mat/0004290v2

Physics

Condensed Matter

10 pages, 3 figures, submitted to Physical Review Letters. Corrections made following referees' comments

Scientific paper

10.1103/PhysRevLett.85.1795

Bose-Einstein condensation has been achieved in a magnetically trapped sample of 85Rb atoms. Long-lived condensates of up to 10^4 atoms have been produced by using a magnetic-field-induced Feshbach resonance to reverse the sign of the scattering length. This system provides many unique opportunities for the study of condensate physics. The variation of the scattering length near the resonance has been used to magnetically tune the condensate self-interaction energy over a very wide range. This range extended from very strong repulsive to large attractive self-interactions. When the interactions were switched from repulsive to attractive, the condensate shrank to below our resolution limit, and after ~5 ms emitted a burst of high-energy atoms.

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