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arXiv 1802.00547cond-mat.stat-mechphysics.soc-ph
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核心-外围网络中伊辛模型的双相变

Double phase transition of the Ising model in core-periphery networks

Hanshuang Chen, Haifeng Zhang, Chuansheng Shen

摘要:

研究了具有核-外围结构网络中伊辛模型的相变。通过蒙特卡罗模拟,我们发现,在有序-无序相变之前,系统组织成一个非均匀的中间相,其中核心节点比外围节点有序得多。有趣的是,磁化率在两个不同的温度下显示双峰。我们发现,如果核心和外围之间的连接与网络尺寸线性增加,第一个峰值不表现出任何尺寸依赖的效果,和第二个发散的限制,无限的网络尺寸。否则,如果核心和外围之间的连接规模与网络大小的次线性,两个峰值的磁化率发散的热力学极限的幂律。这表明在后一种情况下,在伊辛模型中出现了双跃迁现象。此外,我们发展了一个平均场论,同意与模拟。

英文摘要:

We study the phase transition of the Ising model in networks with core-periphery structures. By Monte Carlo simulations, we show that prior to the order-disorder phase transition the system organizes into an inhomogeneous intermediate phase in which core nodes are much more ordered than peripheral nodes. Interestingly, the susceptibility shows double peaks at two distinct temperatures. We find that, if the connections between core and periphery increase linearly with network size, the first peak does not exhibit any size-dependent effect, and the second one diverges in the limit of infinite network size. Otherwise, if the connections between core and periphery scale sub-linearly with the network size, both peaks of the susceptibility diverge as power laws in the thermodynamic limit. This suggests the appearance of a double transition phenomenon in the Ising model for the latter case. Moreover, we develop a mean-field theory that agrees well with the simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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