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arXiv 1707.01735cond-mat.stat-mech
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二维非对称第二近邻相互作用伊辛模型中的零温粗化

Zero temperature coarsening in Ising model with asymmetric second neighbour interaction in two dimensions

Pratik Mullick, Parongama Sen

摘要:

我们考虑了二维伊辛模型中自旋在摩尔邻域内相互作用的零温粗化。哈密尔顿算子由$H = - \sum_{<i,j>}{S_iS_j} - κ\sum_{<i,j'>}{S_iS_{j'}}$和$κ\geq 0$给出,其中两项分别用于第一邻居和第二邻居。对于任何$κ$,都可以看到在二维中已经注意到的$κ=0$冻结现象。然而,随着$κ$的增加,冻结态显示出更复杂的结构;例如,对于$κ>2$,可以存在局部反铁磁基序。有限尺寸的系统也显示了$κ> 2$的等能活性相的存在,其在热力学极限中消失。持续概率显示了$κ>0$的普遍行为,但当考虑非齐次初始条件时,它与$κ=0$的结果明显不同。退出概率显示了所有$κ\geq 0$的通用行为。与其他模型的结果进行了比较,在两个维度的相互作用超出了第一个邻居。

英文摘要:

We consider the zero temperature coarsening in the Ising model in two dimensions where the spins interact within the Moore neighbourhood. The Hamiltonian is given by $H = - \sum_{<i,j>}{S_iS_j} - κ\sum_{<i,j'>}{S_iS_{j'}}$ where the two terms are for the first neighbours and second neighbours respectively and $κ\geq 0$. The freezing phenomena, already noted in two dimensions for $κ=0$, is seen to be present for any $κ$. However, the frozen states show more complicated structure as $κ$ is increased; e.g. local anti-ferromagnetic motifs can exist for $κ>2$. Finite sized systems also show the existence of an iso-energetic active phase for $κ> 2$, which vanishes in the thermodynamic limit. The persistence probability shows universal behaviour for $κ>0$, however it is clearly different from the $κ=0$ results when non-homogeneous initial condition is considered. Exit probability shows universal behaviour for all $κ\geq 0$. The results are compared with other models in two dimensions having interactions beyond the first neighbour.

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