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Publication Citation: Collisional cooling of ultra-cold atom ensembles using Feshbach resonances

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Author(s): Ludwig G. Mathey; Eite Tiesinga; Paul S. Julienne; Charles W. Clark;
Title: Collisional cooling of ultra-cold atom ensembles using Feshbach resonances
Published: September 08, 2009
Abstract: We propose a new type of cooling mechanism for ultra-cold fermionic atom ensembles, which capitalizes on the energy dependence of inelastic collisions in the presence of a Feshbach resonance. We first discuss the case of a single magnetic resonance, and find that the final temperature and the cooling rate is limited by the width of the resonance. A concrete example, based on a $p$-wave resonance of $^{40}$K, is given. We then improve upon this setup by using both a very sharp optical resonance and a very broad magnetic resonance and show that one can improve upon temperatures reached with current technologies.
Citation: Physical Review Letters
Volume: 80
Pages: 4 pp.
Keywords: cooling; Feshbach resonance; scattering; ultra cold atoms
Research Areas: Atomic Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (238KB)