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Collisional cooling of ultra-cold atom ensembles using Feshbach resonances

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arxiv 0903.2568 v1 pith:YU7VGYXP submitted 2009-03-14 cond-mat.other

L. Mathey , Eite Tiesinga , Paul S. Julienne , Charles W. Clark This is my paper · ORCID
classification cond-mat.other
keywords resonancecoolingatomensemblesfeshbachimprovemagneticultra-cold
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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 or radio-frequency induced resonance and a very broad magnetic resonance and show that one can improve upon temperatures reached with current technologies.

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