Spontaneous demagnetization of a dipolar spinor Bose gas in an ultralow magnetic field.
Phys Rev Lett
; 106(25): 255303, 2011 Jun 24.
Article
em En
| MEDLINE
| ID: mdl-21770651
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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En
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Phys Rev Lett
Ano de publicação:
2011
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Article
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