Transition temperature scaling in weakly coupled two-dimensional Ising models

Transition temperature scaling in weakly coupled two-dimensional Ising models
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弱耦合二维 Ising 模型中的转变温度标度

DOI:
10.1016/j.physa.2019.123276
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发表时间:
2020
期刊:
Statistical Mechanics and its Applications
影响因子:
--
通讯作者:
Moodie J
Moodie J
中科院分区:
--
文献类型:
--
作者:
Moodie J

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我们研究了这样的建议:对于弱耦合二维磁体,转变温度与临界指数成比例,该指数相当于基础二维模型中磁化率的指数,γ。利用传递矩阵的精确对角化,我们可以准确确定伊辛模型的临界温度,然后拟合近似该临界指数。我们发现需要额外的对数来预测转变温度,这是因为伊辛模型的热容指数 α 趋于零,从而使基本预测变得复杂。我们认为传递矩阵的激励对应于模型的热化拓扑激励,并发现即使是最简单的模型也会随着温度的变化而表现出与这些激励中最相关的行为的显着变化。
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 suggest 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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发表时间: 1998-02-15
期刊: PHYSICA A
影响因子: 3.3
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