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arXiv 0910.3202cond-mat.stat-mechcond-mat.dis-nn
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连续场概率分布下Blume-Capel模型的多临界性

Multicriticality in the Blume-Capel model under a continuous-field probability distribution

Octavio D. Rodriguez Salmon, Justo Rojas Tapia

摘要:

通过在晶场$Δ_{i}$中引入淬火无序来研究具有无限程相互作用的Blume-Capel模型的多临界行为,该晶场$σ$由两个具有相同宽度的高斯分布的叠加表示,中心位于$Δ_{i} = Δ$和$Δ_{i} = 0$,概率分别为$p$和$(1-p)$。丰富多样的相图,其独特的拓扑结构显示为不同的值的$σ$和$p$。通过四阶临界点的存在以及如何通过无序的强度降低相图的复杂性来分析三临界行为。

英文摘要:

The multicritical behavior of the Blume-Capel model with infinite-range interactions is investigated by introducing quenched disorder in the crystal field $Δ_{i}$, which is represented by a superposition of two Gaussian distributions with the same width $σ$, centered at $Δ_{i} = Δ$ and $Δ_{i} = 0$, with probabilities $p$ and $(1-p)$, respectively. A rich variety of phase diagrams is presented, and their distinct topologies are shown for different values of $σ$ and $p$. The tricritical behavior is analyzed through the existence of fourth-order critical points as well as how the complexity of the phase diagrams is reduced by the strength of the disorder.

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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