Collisional cooling of ultra-cold atom ensembles using Feshbach resonances

ORAL

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 reach temperatures competitive to those created by current technologies.

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Authors

  • Ludwig Mathey

    NIST and JQI, National Institute of Standards and Technology

  • Eite Tiesinga

    NIST and JQI, Joint Quantum Institute, NIST and University of Maryland, Joint Quantum Institute (UMd and NIST)

  • Paul Julienne

    NIST and JQI, Joint Quantum Institute, NIST and the University of Maryland, Joint Quantum Institute of the University of maryland and the National Institute of Standards and Technology

  • Charles Clark

    Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg MD 20899, Joint Quantum Institute, National Institute of Standards and Technology, Joint Quantum Institute, University of Maryland and National Institute of Standard and Technology,Gaithersburg, MD 20899, NIST and JQI, NIST