We study the spatial distributions of the spin and mass currents generated by a moving Gaussian magnetic obstacle in a symmetric, two-component Bose–Einstein condensate in two dimensions. We analytically describe the current distributions for a slow obstacle and show that the spin and the mass currents exhibit characteristic spatial structures resembling those of electromagnetic fields around dipole moments. When the obstacle’s velocity increases, we numerically observe that the flow pattern maintains its overall structure while the spin polarization induced by the obstacle is enhanced with an increased spin current. We investigate the critical velocity of the magnetic obstacle based on the local criterion of Landau energetic instability and find that it decreases almost linearly as the magnitude of the obstacle’s potential increases, which can be directly tested in current experiments.

中文翻译：

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两组分玻色-爱因斯坦凝聚中移动磁障碍附近的自旋和质量电流

我们研究了由移动的高斯磁障碍在二维对称的双组分玻色-爱因斯坦凝聚体中产生的自旋和质量电流的空间分布。我们分析地描述了慢速障碍物的电流分布，并表明自旋和质量电流表现出类似于偶极矩周围电磁场的特征空间结构。当障碍物的速度增加时，我们从数值上观察到流动模式保持其整体结构，而障碍物引起的自旋极化随着自旋电流的增加而增强。我们根据朗道能量不稳定性的局部标准研究了磁障碍物的临界速度，发现它随着障碍物电位大小的增加几乎呈线性下降，