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Stable ⁸⁵Rb Bose-Einstein Condensates with Widely Tunable Interactions

S. L. Cornish

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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N. R. Claussen

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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J. L. Roberts

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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E. A. Cornell

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

Quantum Physics Division, National Institute of Standards and Technology.

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C. E. Wieman

JILA, Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

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https://doi.org/10.1142/9789812813787_0078Cited by:0 (Source: Crossref)

Abstract:

Bose-Einstein condensation has been achieved in a magnetically trapped sample of ⁸⁵Rb atoms. Longlived condensates of up to 10⁴ atoms have been produced by using a magnetic-field-induced Feshbach resonance to reverse the sign of the scattering length. This system provides new 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 wide range, extending from strong repulsive to large attractive 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.

PACS: 03.75.Fi, 05.30.Jp, 32.80.Pj, 34.50.−s

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Stable ⁸⁵Rb Bose-Einstein Condensates with Widely Tunable Interactions