论文标题
在铁磁自旋1玻色 - 内斯坦冷凝物中的极核自旋涡流的阻尼点涡流模型
A damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate
论文作者
论文摘要
破碎的轴对称相中的铁磁自旋1玻色 - 玻璃体缩合两层支撑极核自旋涡旋（PCVS），它们与系统的非平衡动力学密切相关。对于纯横向磁化系统，Turner Point-Qultex模型预测，PCV的行为就像通过二维库仑电势相互作用的巨大带电粒子。我们通过与数值模拟的比较测试了两个相对充满电的PCV的Turner模型的准确性。虽然裸机模型显示出与我们的数值结果的差异，但我们发现对PCV质量的简单重新缩放提供了更好的一致性。这可以通过从耦合到外部模式到点 - 涡流相空间引起的现象学阻尼来解释。我们还确定了PCV歼灭后产生的激发，这有助于阐明最近的阶段排序结果。我们将Turner模型扩展到系统在横向和轴向上磁化的情况，从而识别到标量涡流动力学以增加外部Zeeman场的跨界。
Ferromagnetic spin-1 Bose-Einstein condensates in the broken-axisymmetric phase support polar-core spin vortices (PCVs), which are intimately linked to the nonequilibrium dynamics of the system. For a purely transversely magnetized system, the Turner point-vortex model predicts that PCVs behave like massive charged particles interacting via a two-dimensional Coulomb potential. We test the accuracy of the Turner model for two oppositely charged PCVs, via comparisons with numerical simulations. While the bare Turner model shows discrepancies with our numerical results, we find that a simple rescaling of the PCV mass gives much better agreement. This can be explained via a phenomenological damping arising from coupling to modes extrinsic to the point-vortex phase space. We also identify the excitations produced following PCV annihilation, which help elucidate recent phase ordering results. We extend the Turner model to cases where the system is magnetized both transversally and axially, identifying a crossover to scalar vortex dynamics for increasing external Zeeman field.
