Magnetization Oscillation of a Spinor Condensate Induced by Magnetic Field Gradient

Abstract

We study the spin mixing dynamics of ultracold spin-1 atoms in a weak non-uniform magnetic field with field gradient $G$, which can flip the spin from +1 to -1 so that the magnetization $m={\rho }_{+}-{\rho }_{-}$ is not any more a constant. The dynamics of $m_F=0$ Zeeman component ${\rho }_0$, as well as the system magnetization $m$, are illustrated for both ferromagnetic and polar interaction cases in the mean-field theory. We find that the dynamics of system magnetization can be tuned between the Josephson-like oscillation similar to the case of double well, and the interesting self-trapping regimes, i.e. the spin mixing dynamics sustains a spontaneous magnetization. Meanwhile the dynamics of ${\rho }_0$ may be sufficiently suppressed for initially imbalanced number distribution in the case of polar interaction. A "beat-frequency" oscillation of the magnetization emerges in the case of balanced initial distribution for polar interaction, which vanishes for ferromagnetic interaction.

6 pages, 5 figures, Phys. Rev. A accepted

References in corpus (7)

• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Fragmentation of Bose-Einstein Condensates
• Ground states of spin-3 Bose-Einstein condensates for conserved magnetization
• A binary mixture of spinor atomic Bose-Einstein condensates
• Localization of spin mixing dynamics in a spin-1 Bose-Einstein condensate
• Quantum states of a binary mixture of spinor Bose-Einstein condensates
• Atomic number fluctuations in a mixture of two spinor condensates

Cited by in corpus (3)

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• Geometric phase driven Josephson junction: Possible experimental scheme for the search of spin superfluidity