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arXiv 2008.03169cond-mat.stat-mech
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用Monte Carlo方法分析三维长程关联无序伊辛模型的临界指数$ν$

Critical exponent $ν$ of the Ising model in three dimensions with long-range correlated site disorder analyzed with Monte Carlo techniques

Stanislav Kazmin, Wolfhard Janke

摘要:

利用Monte Carlo模拟方法研究了具有无序点阵的三维伊辛模型的临界行为。该障碍是不相关的或长程相关的相关函数,根据幂律$r^{-a}$衰减。通过将不同浓度的缺陷$0.05 \leq p_d \leq 0.4$组合成一个全局拟合模型并应用有限尺寸标度技术,我们推导出了相关长度$ν$的临界指数和与$a$相关的汇合校正指数$ω$。我们模拟和研究了广泛的不同的相关指数$1.5 \leq a \leq 3.5$以及不相关的情况下$a = \infty$,并能够提供一个全球性的图片还不知道从以前的作品。此外,我们进行了专门的分析,我们的远程相关的障碍合奏,并提供依赖于相关指数$a$和缺陷的浓度$p_d$的系统的临界温度的估计。我们比较我们的结果,从其他作品的已知结果和猜想的Weinrib和Halperin:$ν= 2/a$和讨论发生的偏差。

英文摘要:

We study the critical behavior of the Ising model in three dimensions on a lattice with site disorder by using Monte Carlo simulations. The disorder is either uncorrelated or long-range correlated with correlation function that decays according to a power-law $r^{-a}$. We derive the critical exponent of the correlation length $ν$ and the confluent correction exponent $ω$ in dependence of $a$ by combining different concentrations of defects $0.05 \leq p_d \leq 0.4$ into one global fit ansatz and applying finite-size scaling techniques. We simulate and study a wide range of different correlation exponents $1.5 \leq a \leq 3.5$ as well as the uncorrelated case $a = \infty$ and are able to provide a global picture not yet known from previous works. Additionally, we perform a dedicated analysis of our long-range correlated disorder ensembles and provide estimates for the critical temperatures of the system in dependence of the correlation exponent $a$ and the concentrations of defects $p_d$. We compare our results to known results from other works and to the conjecture of Weinrib and Halperin: $ν= 2/a$ and discuss the occurring deviations.

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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