We study the dynamics of a quasi-two-dimensional (2D) spin-orbit-coupled ferromagnetic Bose-Einstein condensate (BEC) under a linear Zeeman magnetic field disturbed by a moving obstacle. The Bogoliubov excitation spectrums and corresponding critical excitations in different situations are analyzed. The structure of the coreless vortex or antivortex generated by the moving obstacle has been investigated. When the Zeeman field is parallel to the 2D system plane, the vortex cores for the three components of a (an) vortex (antivortex) could be arranged into a line which is vertical to the Zeeman field, and their order would be reversed as the spin-orbit coupling increases. When the Zeeman field is perpendicular to the plane, a skyrmionlike vortex ground state could be induced via spin-orbit interaction even by a static obstacle and thus becomes unique in contrast with the scalar BECs or spinor BECs without spin-orbit coupling. This topological structure is also found to be dynamically stable if the obstacle is moving at a relatively small velocity.

中文翻译：

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自旋轨道耦合的自旋1 Bose-Einstein凝结水流在塞曼场的作用下越过障碍物

我们研究了线性二维塞曼磁场在运动障碍物干扰下的准二维（2D）自旋轨道耦合铁磁玻色-爱因斯坦凝聚物（BEC）的动力学。分析了不同情况下的Bogoliubov激发光谱和相应的临界激发。已经研究了由移动障碍物产生的无芯涡旋或反涡旋的结构。当Zeeman场平行于2D系统平面时，一个（一个）涡旋（反涡旋）的三个分量的涡旋核可以排列成一条垂直于Zeeman场的线，并且它们的顺序将与自旋轨道耦合增加。当塞曼场垂直于平面时，甚至通过静态障碍物，也可以通过自旋轨道相互作用而诱发像天空云一样的涡旋基态，因此与标量BEC或没有自旋轨道耦合的自旋BEC相比，它成为独特的。如果障碍物以相对较小的速度移动，则还发现此拓扑结构是动态稳定的。