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arXiv 1602.07229cond-mat.dis-nncond-mat.stat-mech
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具有长程关联无序的二维伊辛模型的临界行为

Critical behavior of the 2D Ising model with long-range correlated disorder

Maxym Dudka, Andrei A. Fedorenko, Viktoria Blavatska, Yurij Holovatch

摘要:

研究了在无序关联存在下稀释二维伊辛模型的临界行为,无序关联随距离按$\sim r^{-a}$代数衰减.将问题映射到具有关联无序的二维狄拉克费米子上,我们利用重整化群计算了两圈阶的临界性质。我们发现,除了高斯不动点的流动方程有一个非平凡的不动点,这是稳定的$0.995<a<2$,其特征在于相关长度指数$ν= 2/a + O((2-a)^3)$。利用玻色化,我们还计算了自旋-自旋关联函数的平均平方,并找到了相应的临界指数$η_2=1/2-(2-a)/4+O((2-a)^2)$。

英文摘要:

We study critical behavior of the diluted 2D Ising model in the presence of disorder correlations which decay algebraically with distance as $\sim r^{-a}$. Mapping the problem onto 2D Dirac fermions with correlated disorder we calculate the critical properties using renormalization group up to two-loop order. We show that beside the Gaussian fixed point the flow equations have a non trivial fixed point which is stable for $0.995<a<2$ and is characterized by the correlation length exponent $ν= 2/a + O((2-a)^3)$. Using bosonization, we also calculate the averaged square of the spin-spin correlation function and find the corresponding critical exponent $η_2=1/2-(2-a)/4+O((2-a)^2)$.

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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