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arXiv 0811.3827cond-mat.stat-mech
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具有节点依赖相互作用的阿波罗网络的伊辛模型

Ising model on the Apollonian network with node dependent interactions

R. F. S. Andrade, J. S. Andrade, H. J. Herrmann

摘要:

本文考虑了阿波罗网络上的伊辛模型,其中两个相邻自旋$(i,j)$之间的交换常数$J_{i,j}\sim1/(k_ik_j)^μ$是两个自旋的度$k$的函数.使用精确的几何构造规则的网络,通过迭代系统的离散映射,允许非常精确的结果,在热力学极限的结晶和磁性进行评估。结果可以比较的自旋模型的无标度网络,其中节点分布$P(k)\sim k^{-γ}$,与节点相关的相互作用常数的一般框架的预测。我们观察到,通过增加$μ$,该模型的临界行为的变化,从一个相变在$T=\infty$为一个均匀的系统$(μ=0)$,T=0相变时,$μ=1$:在热力学极限,该系统在有限的温度下没有表现出严格的临界行为。磁化强度和磁化率被发现目前非临界标度特性。

英文摘要:

This work considers an Ising model on the Apollonian network, where the exchange constant $J_{i,j}\sim1/(k_ik_j)^μ$ between two neighboring spins $(i,j)$ is a function of the degree $k$ of both spins. Using the exact geometrical construction rule for the network, the thermodynamical and magnetic properties are evaluated by iterating a system of discrete maps that allows for very precise results in the thermodynamic limit. The results can be compared to the predictions of a general framework for spins models on scale-free networks, where the node distribution $P(k)\sim k^{-γ}$, with node dependent interacting constants. We observe that, by increasing $μ$, the critical behavior of the model changes, from a phase transition at $T=\infty$ for a uniform system $(μ=0)$, to a T=0 phase transition when $μ=1$: in the thermodynamic limit, the system shows no exactly critical behavior at a finite temperature. The magnetization and magnetic susceptibility are found to present non-critical scaling properties.

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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