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Updated: May 30, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Spontaneous demagnetization of a dipolar spinor Bose gas in an ultralow magnetic field
B Pasquiou1, E Maréchal, G Bismut
1Laboratoire de Physique des Lasers, CNRS UMR 7538, Université Paris 13, 99 Avenue J-B Clément, 93430 Villetaneuse, France.
Abstract:
We study the spinor properties of S = 3 (52)Cr condensates, in which dipole-dipole interactions allow changes in magnetization. We observe a demagnetization of the Bose-Einstein condensate (BEC) when the magnetic field is quenched below a critical value corresponding to a phase transition between a ferromagnetic and a nonpolarized ground state, which occurs when spin-dependent contact interactions overwhelm the linear Zeeman effect. The critical field is increased when the density is raised by loading the BEC in a deep 2D optical lattice. The magnetization dynamics is set by dipole-dipole interactions.
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