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arXiv · 1505.05098

Cooling of a Bose-Einstein Condensate by spin distillation

Bruno Naylor·Etienne Marechal·John Huckans·Olivier Gorceix·Paolo Pedri·Laurent Vernac·Bruno Laburthe-Tolra
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Abstract

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.

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Bruno Naylor, Etienne Marechal, John Huckans, Olivier Gorceix, Paolo Pedri, Laurent Vernac, Bruno Laburthe-Tolra. 2015-05-19. Cooling of a Bose-Einstein Condensate by spin distillation. https://doi.org/10.1103/physrevlett.115.243002

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