Damagnetization cooling of a gas

Details Damagnetization cooling of a gas Damagnetization cooling of a gas

2006-10-18

arxiv.org/abs/cond-mat/0610498v1

Nature Physics, November 2006

Physics

Condensed Matter

Other Condensed Matter

10 pages, 5 figures

Scientific paper

We demonstrate demagnetization cooling of a gas of ultracold $^{52}$Cr atoms. Demagnetization is driven by inelastic dipolar collisions which couple the motional degrees of freedom to the spin degree. By that kinetic energy is converted into magnetic work with a consequent temperature reduction of the gas. Optical pumping is used to magnetize the system and drive continuous demagnetization cooling. Applying this technique, we can increase the phase space density of our sample by one order of magnitude, with nearly no atom loss. This method can be in principle extended to every dipolar system and could be used to achieve quantum degeneracy via optical means.

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