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Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems

E. Hodby

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

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S. T. Thompson

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

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C. A. Regal

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

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M. Greiner

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

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A. C. Wilson

Department of Physics, University of Otago, Dunedin, New Zealand

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D. S. Jin

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

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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

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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

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https://doi.org/10.1142/9789812813787_0089Cited by:0 (Source: Crossref)

Abstract:

We investigate the production efficiency of ultracold molecules in bosonic ⁸⁵Rb and fermionic ⁴⁰K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, our novel model shows that the conversion efficiency of both species is solely determined by the phase space density of the atomic cloud, in contrast with a number of theoretical predictions. In the nonadiabatic regime our measurements of the ⁸⁵Rb molecule conversion efficiency follow a Landau-Zener model.

PACS: 05.30.Jp, 03.75.Ss, 05.30.Fk, 36.90.+f

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Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems

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