铁磁玻色-爱因斯坦凝聚体的耗散流体动力学方程：与导电铁磁体磁化动力学的类比
Dissipative hydrodynamic equation of a ferromagnetic Bose-Einstein condensate: Analogy to magnetization dynamics in conducting ferromagnets
摘要：
旋量玻色-爱因斯坦凝聚体（BEC）的流体力学方程给出了凝聚体中自旋动力学的简单描述。本文引入了耗散源于凝聚体能量耗散的铁磁BEC的流体力学方程。耗散流体动力学方程具有与扩展的Landau-Lifshitz-Gilbert（LLG）方程相同的形式，其描述了铁磁体与自旋极化电流相互作用的磁化动力学。利用耗散流体动力学方程，我们证明了铁磁BEC的磁畴图案动力学的存在和不存在的粒子流，并讨论了电流对磁畴斑图形成的影响。我们还讨论了域模式的特征长度，有域壁和没有有限的磁化。
英文摘要：
The hydrodynamic equation of a spinor Bose-Einstein condensate (BEC) gives a simple description of spin dynamics in the condensate. We introduce the hydrodynamic equation of a ferromagnetic BEC with dissipation originating from the energy dissipation of the condensate. The dissipative hydrodynamic equation has the same form as an extended Landau-Lifshitz-Gilbert (LLG) equation, which describes the magnetization dynamics of ferromagnets interacting with spin-polarized currents. Employing the dissipative hydrodynamic equation, we demonstrate the magnetic domain pattern dynamics of a ferromagnetic BEC in the presence and absence of a current of particles, and discuss the effects of the current on domain pattern formation. We also discuss the characteristic lengths of domain patterns that have domain walls with and without finite magnetization.
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