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arXiv 2201.12615math-phcond-mat.stat-mechmath.MP
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Cayley树上自旋为1和1/2的混合伊辛模型的Gibbs测度

Gibbs measures of the Ising model with mixed spin-1 and spin-1/2 on a Cayley tree

Hasan Akin, Farrukh Mukhamedov

摘要:

本文考虑二阶Cayley树上具有混合自旋-(1,1/2)的伊辛模型.给出了相应于该模型的分裂吉布斯测度的构造,它允许建立相变的存在性(吉布斯测度的非唯一性)。我们指出,在相变区,所考虑的模型在铁磁和反铁磁区具有三个不变性Gibbs测度,而经典伊辛模型在反铁磁区不具有这样的Gibbs测度.结果表明,所考虑的模型,如伊辛模型,表现出无序吉布斯测度。因此,非极端和极端的无序吉布斯测度的研究通过树指标马尔可夫链。

英文摘要:

In the present paper, the Ising model with mixed spin-(1,1/2) is considered on the second order Cayley tree. A construction of splitting Gibbs measures corresponding the model is given which allows to establish the existence of the phase transition (non-uniqueness of Gibbs measures). We point out that, in the phase transition region, the considered model has three translation-invariant Gibbs measures in the ferromagnetic and anti-ferromagnetic regimes, while the classical Ising model does not possesses such Gibbs measures in the anti-ferromagnetic regime. It turns out that the considered model, like the Ising model, exhibits a disordered Gibbs measure. Therefore, non-extremity and extremity of such disordered Gibbs measures is investigated by means of tree-indexed Markov chains.

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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