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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References in corpus (8)

• Observation of antiferromagnetic correlations in the Hubbard model with ultracold atoms
• Spinor Dynamics in an Antiferromagnetic Spin-1 Condensate
• Cooling in strongly correlated optical lattices: prospects and challenges
• Spin gradient demagnetization cooling of ultracold atoms
• Thermometry and cooling of a Bose-Einstein condensate to 0.02 times the critical temperature
• Dipolar atomic spin ensembles in a double-well potential
• Thermal spin fluctuations in spinor Bose-Einstein condensates
• Spin 1 condensates at thermal equilibrium : a $SU(3)$ coherent state approach

Cited by in corpus (8)

• Dipolar physics: A review of experiments with magnetic quantum gases
• Single-atom quantum probes for ultracold gases using nonequilibrium spin dynamics
• Stepwise Bose-Einstein condensation in a spinor gas
• Competition between Bose Einstein Condensation and spin dynamics
• Collisional spin transfer in an atomic heteronuclear spinor Bose gas
• Heat transfer through dipolar coupling: Sympathetic cooling without contact
• Dissipative cooling of spin chains by a bath of dipolar particles
• Spin distillation cooling of ultracold Bose gases