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Collisional cooling of ultra-cold atom ensembles using Feshbach resonances



Ludwig G. Mathey, Eite Tiesinga, Paul S. Julienne, Charles W. Clark


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.
Physical Review Letters


cooling, Feshbach resonance, scattering, ultra cold atoms


Mathey, L. , Tiesinga, E. , Julienne, P. and Clark, C. (2009), Collisional cooling of ultra-cold atom ensembles using Feshbach resonances, Physical Review Letters, [online], (Accessed June 22, 2024)


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Created September 8, 2009, Updated February 19, 2017