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arXiv 2007.04127cond-mat.stat-mech
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一维稀疏伊辛模型的局域分布

Local distributions of the 1D dilute Ising model

Yu. D. Panov

摘要:

研究了一维带电杂质稀退火伊辛模型的局域分布。得到了对分布函数和相关长度的显式表达式,并探讨了它们随杂质浓度的低温渐近行为。为了更详细地考虑排序过程,我们研究局部分布。基于稀疏伊辛链的马尔可夫性质,我们得到了任意有限序列的概率的显式表达式,并找到了由重复块组成的序列的长度的几何概率分布.分布分析表明,自旋关联长度的临界行为由铁磁或反铁磁序列决定,而杂质关联长度的临界行为由杂质序列或电荷有序序列决定。对于稀伊辛链,没有其他重复序列的平均长度在零温度下发散。虽然自旋相关和杂质相关长度可以发散,只有在零温度下,有序过程中的结果在有限的温度下的最大比热定义的杂质自旋对浓度的最大变化率。一个简单的近似方程被发现这个温度。我们证明了无序稀疏伊辛链对应于规则马尔可夫链,而不同的排序生成不同类型的不规则马尔可夫链。

英文摘要:

The local distributions of the one-dimensional dilute annealed Ising model with charged impurities are studied. Explicit expressions are obtained for the pair distribution functions and correlation lengths, and their low-temperature asymptotic behavior is explored depending on the concentration of impurities. For a more detailed consideration of the ordering processes, we study local distributions. Based on the Markov property of the dilute Ising chain, we obtain an explicit expression for the probability of any finite sequence and find a geometric probability distribution for the lengths of sequences consisting of repeating blocks. An analysis of distributions shows that the critical behavior of the spin correlation length is defined by ferromagnetic or antiferromagnetic sequences, while the critical behavior of the impurity correlation length is defined by the sequences of impurities or by the charge-ordered sequences. For the dilute Ising chain, there are no other repeating sequences whose mean length diverges at zero temperature. While both the spin correlation and the impurity correlation lengths can diverge only at zero temperature, the ordering processes result in a maximum of the specific heat at finite temperature defined by the maximum rate of change of the impurity-spin pairs concentration. A simple approximate equation is found for this temperature. We show that the non-ordered dilute Ising chains correspond to the regular Markov chains, while various orderings generate the irregular Markov chains of different types.

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