论文标题
两组分玻璃凝结物中移动的磁性障碍物附近的自旋和质量电流
Spin and mass currents near a moving magnetic obstacle in a two-component Bose-Einstein condensate
论文作者
论文摘要
我们研究了在对称的两个组件玻璃纤维中，在二维的对称，两个组分的玻色子凝结物中，由移动的高斯磁性障碍物产生的自旋和质量电流的空间分布。我们通过分析描述了慢速障碍物的当前分布，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，而随着自旋电流的增加，障碍物引起的自旋极化会增强。我们根据Landau能量不稳定性的局部标准研究了磁障碍物的临界速度，并发现它几乎随着障碍物电势增加的幅度而几乎线性降低，这可以在当前的实验中直接测试。
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.
