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arXiv 1902.04464cond-mat.stat-mech
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弱耦合二维伊辛模型中的Transition temperature标度

Transition temperature scaling in weakly coupled two-dimensional Ising models

Jordan C. Moodie, Manjinder Kainth, Matthew R. Robson, M. W. Long

摘要:

我们调查的建议,弱耦合的二维磁体的转变温度标度的临界指数,这是相当于在底层的二维模型,$ γ$的磁化率。利用传递矩阵的精确对角化,我们可以精确地确定伊辛模型的临界温度,然后拟合近似这个临界指数。我们发现需要一个额外的对数来预测转变温度,源于这样一个事实,即热容指数$ α$趋于零,这个伊辛模型,复杂的基本预测。我们认为,对应于模型的热化拓扑激发的传输矩阵的激励,并发现,即使是最简单的模型表现出显着的变化的行为,最相关的这些激发的温度是不同的。

英文摘要:

We investigate the proposal that for weakly coupled two-dimensional magnets the transition temperature scales with a critical exponent which is equivalent to that of the susceptibility in the underlying two-dimensional model, $ γ$. Employing the exact diagonalization of transfer matrices we can determine the critical temperature for Ising models accurately and then fit to approximate this critical exponent. We find an additional logarithm is required to predict the transition temperature, stemming from the fact that the heat capacity exponent $ α$ tends to zero for this Ising model, complicating the elementary prediction. We believe that the excitations of the transfer matrix correspond to thermalized topological excitations of the model and find that even the simplest model exhibits significant changes of behavior for the most relevant of these excitations as the temperature is varied.

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