Article Dans Une Revue Physical Review Letters Année : 2015

Cooling of a Bose-Einstein Condensate by spin distillation

Résumé

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 $^{52}$Cr dipolar BEC. Our scheme should be applicable to Na or Rb, with perspective to reach temperatures below 1 nK.

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hal-01153675 , version 1 (11-09-2024)

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B. Naylor, E. Maréchal, J. Huckans, Olivier Gorceix, P. Pedri, et al.. Cooling of a Bose-Einstein Condensate by spin distillation. Physical Review Letters, 2015, 115, pp.243002. ⟨10.1103/PhysRevLett.115.243002⟩. ⟨hal-01153675⟩
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