%0 Journal Article
%T Cooling of a Bose-Einstein Condensate by spin distillation
%A Bruno Naylor
%A Etienne Marechal
%A John Huckans
%A Olivier Gorceix
%A Paolo Pedri
%A Laurent Vernac
%A Bruno Laburthe-Tolra
%J Physics
%D 2015
%I arXiv
%R 10.1103/PhysRevLett.115.243002
%X 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.
%U http://arxiv.org/abs/1505.05098v1