相关自旋岛平面阵列的数值研究
A numerical study of planar arrays of correlated spin islands
摘要：
我们提出了我们的分析系统的相互作用岛屿的XY自旋的三角形晶格，几年前已推出的Eley等人。占的现象，在实验中的可调阵列的近耦合长超导体正常金属超导结。该模型的主要特点是局部和整体相互作用能标度的分离和自旋岛的介观特征。在降低温度的模型经历了两个交叉对应于一个增加的相位相干性在一个单一的岛屿和发病的全球性的连贯性在整个阵列，后者是在伊辛普适性类的一个化学相变。第二跃迁对岛边间距的依赖关系与耦合常数的邻近效应有关。
英文摘要：
We present our analysis of a system of interacting islands of XY spins on a triangular lattice that has been introduced a few years ago by Eley et al. to account for the phenomenology in experiments on tunable arrays of proximity coupled long superconductor-normal metal-superconductor junctions. The main features of the model are the separation of a local and a global interaction energy scale and the mesoscopic character of the spin islands. Upon lowering the temperature the model undergoes two crossovers corresponding to an increasing phase coherence on a single island and to the onset of global coherence across the array; the latter is a thermodynamical phase transition in the Ising universality class. The dependence of the second transition on the island edge-to-edge spacing is related to the proximity-effect of the coupling constant.
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