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...

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Bibliographic Details
Published in:arXiv.org 2015-05
Main Authors: Naylor, Bruno, Marechal, Etienne, Huckans, John, Gorceix, Olivier, Pedri, Paolo, Vernac, Laurent, Bruno Laburthe-Tolra
Format: Article
Language:English
Subjects:
Condensates
Cooling
Distillation
Energy gap
Matter & antimatter
Particle energy
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1505.05098