Collisional cooling of ultra-cold atom ensembles using Feshbach resonances

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.

4 pages, 3 figures

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• p-wave Feshbach molecules
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
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Cited by in corpus (8)

• Realization of a Resonant Fermi Gas with a Large Effective Range
• Creation and manipulation of Feshbach resonances with radio-frequency radiation
• Characterization of the magnetic field through the three-body loss near a narrow Feshbach resonance
• Rapid generation of all-optical ${}^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance
• Controlling the group velocity of colliding atomic Bose-Einstein condensates with Feshbach resonances
• Anomalous loss behavior in a single-component Fermi gas close to a $p$-Wave Feshbach resonance
• Optimization of collisional Feshbach cooling of an ultracold nondegenerate gas
• Cooling a Fermi gas with three-body recombination near a narrow Feshbach resonance