Cooling of a Bose-Einstein Condensate by spin distillation

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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Contributor : Olivier Gorceix <>
Submitted on : Wednesday, May 20, 2015 - 11:28:20 AM
Last modification on : Thursday, February 7, 2019 - 5:48:11 PM

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



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