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Paper detail

Cooling of a Bose-Einstein Condensate by spin distillation

We propose and experimentally demonstrate a new cooling mechanism leading to purification of a spinor Bose-Einstein Condensate (BEC). Our scheme starts with a BEC polarized in the lowest energy spin state. Spin excited states are thermally populated by lowering the single particle energy gap set by the magnetic field. Then these spin-excited thermal components are filtered out, which leads to an increase of the BEC fraction. We experimentally demonstrate such cooling for a spin 3 52Cr dipolar BEC. Our scheme should be applicable to Na or Rb, with perspective to reach temperatures below 1 nK.

preprint2015arXivOpen access
Bruno NaylorEtienne MarechalJohn HuckansOlivier GorceixPaolo PedriLaurent VernacBruno Laburthe-Tolra
cond-mat.quant-gas
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Bruno NaylorEtienne MarechalJohn HuckansOlivier GorceixPaolo PedriLaurent VernacBruno Laburthe-Tolra

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