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.

–

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