Nematic ordering dynamics of an antiferromagnetic spin-1 condensate
Nematic ordering dynamics of an antiferromagnetic spin-1 condensate
复制标题
反铁磁自旋 1 凝聚态的向列有序动力学
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. B. Blakie
中科院分区：
文献类型：
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作者：
L. Symes;P. B. Blakie
研究了从易轴（EA）向列相淬灭到易平面（EP）向列相的准二维反铁磁自旋-1凝聚体中有序的形成。我们定义了相关的阶数参数来量化自旋向列自由度，并通过数值模拟研究了自旋向列和超流体阶数在粗化动力学过程中的演变。在时滞动力学中，我们观察到动态标度，这两种类型的阶都以扩散增长规律在系统中扩展。我们将半量子涡旋（hqv）识别为有序动力学的相关拓扑缺陷，并证明了这两种类型的有序的增长是由这些涡旋的相互湮灭决定的。
We consider the formation of order in a quasi-two-dimensional (quasi-2D) anti-ferromagnetic spin-1 condensate quenched from an easy-axis (EA) to an easy-plane (EP) nematic phase. We define the relevant order parameter to quantify the spin-nematic degrees of freedom and study the evolution of the spin-nematic and superfluid order during the coarsening dynamics using numerical simulations. We observe dynamical scaling in the late time dynamics with both types of order extending across the system with a diffusive growth law. We identify half-quantum vortices (HQVs) as the relevant topological defects of the ordering dynamics, and demonstrate that the growth of both types of order is determined by the mutual annihilation of these vortices.