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arXiv 1402.0683hep-th
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双核baby-Skyrmion系统的自发对称性破缺

Spontaneous symmetry breaking in dual-core baby-Skyrmion systems

Boris A. Malomed, Yakov Shnir, Gleb Zhilin

摘要:

我们介绍了一个由两个(2+1)维baby-skyrmion模型(BSM)组成的系统,它们位于平行的平面上,通过场的隧穿线性耦合。该系统可以在双层铁磁介质中实现。与非线性光学和玻色-爱因斯坦凝聚理论中的双核模型不同,这里的孤子(baby skyrmions)的破缺分岔(SBB)是随着核间耦合($κ$)的增加而发生的,而不是随着它的减小而发生的,因为即使在非耦合系统中,两个核也不可能是空的.在孤子的两个分量之间的对称性破缺开始之前,由于$κ$的增加,它们在横向方向上逐渐分离,这是通过有效相互作用势以解析形式解释的。这样的演化方案产生的两个核心$\left(B^{(1)},B^{(2)}\right)$,与$% B^{(1)}=B^{(2)}=1,2,3,4$的拓扑电荷的原始对称状态。研究了$\left(1,2\right)$型和$\left(2,4\right)$型混合态随$κ$变化的演化。

英文摘要:

We introduce a system composed of two (2+1)-dimensional baby-skyrmion models (BSMs) set on parallel planes and linearly coupled by tunneling of fields. This system can be realized in a dual-layer ferromagnetic medium. Unlike dual-core models previously studied\ in nonlinear optics and BEC, here the symmetry-breaking bifurcation (SBB) in solitons (baby skyrmions) occurs with the increase of the inter-core coupling ($κ$), rather than with its decrease, due to the fact that even in the uncoupled system neither core may be empty. Prior to the onset of the symmetry breaking between the two components of the solitons, they gradually separate in the lateral direction, due to the increase of $κ$, which is explained in an analytical form by means of an effective interaction potential. Such evolution scenario are produced for the originally symmetric states with topological charges in the two cores $\left(B^{(1)},B^{(2)}\right)$, with $% B^{(1)}=B^{(2)}=1,2,3,4$. The evolution of mixed states, of the $\left(1,2\right)$ and $\left(2,4\right)$ types, with the variation of $κ$ is studied too.

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