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arXiv 1303.3702cond-mat.stat-mech
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含时磁场对$\pm J$伊辛模型的影响

Time dependent magnetic field effects on the $\pm J$ Ising model

Erol Vatansever, Umit Akinci, Hamza Polat

摘要:

在二维正方晶格有效场论的框架下,研究了含时振荡扰动下$\pm J$伊辛模型的非平衡相变性质.经过详细的分析,发现该系统表现出重入现象,铁磁和反铁磁交换相互作用的竞争破坏了动态一级相变和动态三临界点.此外,根据Néel命名法,在一定条件下,发现磁化强度分布遵循Q型、L型和P型分类方案。最后,观察到临界渗流与外加场振幅的处理强烈依赖于随时间变化的外场的频率。

英文摘要:

Nonequilibrium phase transition properties of the $\pm J$ Ising model under a time dependent oscillating perturbation are investigated within the framework of effective field theory for a two-dimensional square lattice. After a detailed analysis, it is found that the studied system exhibits unusual and interesting behaviors such as reentrant phenomena, and the competition between ferromagnetic and antiferromagnetic exchange interactions gives rise to destruct the dynamic first order phase transitions as well as dynamic tricritical points. Furthermore, according to Néel nomenclature, the magnetization profiles have been found to obey Q-type, L-type and P-type classification schemes under certain conditions. Finally, it is observed that the treatment of critical percolation with applied field amplitude strongly depends upon the frequency of time varying external field.

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