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Vortex matter in U(1)×U(1)×Z_2 phase-separated superconducting condensates

机译：U（1）×U（1）×Z_2相分离超导冷凝物中的涡旋物质

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摘要

We study the properties of vortex solutions and magnetic response of two-component U(1)×U(1)×Z_2 superconductors, with phase separation driven by intercomponent density-density interaction. Such a theory can be viewed arising from the breakdown of SU(2) symmetry by a biquadratic interaction between the components of the field. Depending on the symmetry-breaking term, there are two ground-state phases: one where both components of the doublet are equal (the miscible phase) and one where only one component assumes a nonzero vacuum expectation value (the immiscible state). In the latter phase, the spectrum of topological excitations contains both domain walls and vortices. We show the existence of another kind of excitation that has properties of both topological excitations at the same time. This kind of excitation combines vorticity together with a circular domain wall, interpolating between inequivalent broken states, that shows up as a ring of localized magnetic flux. Asymptotically, this resembles a vortex carrying multiple flux quanta, but because the magnetic field is localized at a given distance from the center this looks like a pipe. The isolated multiquanta pipelike vortices can be either stable or metastable, even if the system is not type 1. We discuss the response of such a system to an externally applied magnetic field. Also we discuss magnetic response of SU(2) superconductor.
机译：我们研究了两组分U（1）×U（1）×Z_2超导体的涡旋解的性质和磁响应，其中由组分间密度-密度相互作用驱动相分离。可以看到这种理论源于SU（2）对称性的分解，该对称性是由该场分量之间的二次相互作用引起的。根据破坏对称性的术语，存在两个基态阶段：一个双峰态的两个分量都相等（可混溶相），另一个只有一个分量具有非零真空期望值（不混溶状态）的基态相。在后一阶段，拓扑激发的频谱既包含畴壁又包含涡旋。我们显示了另一种同时具有两种拓扑激发特性的激发。这种激发将涡度与圆形畴壁结合在一起，插在不等价的断裂状态之间，表现为局部磁通的环。渐近地，这类似于携带多个通量量子的涡流，但是由于磁场位于距中心的给定距离处，因此看起来像管道。即使系统不是1型，孤立的多量子管状涡流也可以是稳定的或亚稳态的。我们讨论了这样的系统对外部施加的磁场的响应。我们还将讨论SU（2）超导体的磁响应。

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