arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.5017cond-mat.stat-mechcond-mat.dis-nn
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二维无规键XY模型中的Berezinskiii-Kosterlitz-无规跃迁

Berezinskii-Kosterlitz-Thouless transition in two dimensional random-bond XY model on a square lattice

Yi-Bo Deng, Qiang Gu

摘要:

我们用蒙特卡罗模拟研究了二维正方晶格上的无规键XY模型。讨论了耦合系数服从高斯分布和均匀分布的两种键随机性。结果表明,当两种无序的方差取相同值时,它们的热力学行为相似。这一结果意味着可以选择方差作为特征参数来评估随机性的强度。此外,Berezinskiii-Kosterlitz-无无序转变温度随着方差的增加而降低,并且只要无序足够强,该转变甚至可以被破坏。

英文摘要:

We perform Monte Carlo simulations to study the two dimensional random-bond XY model on a square lattice. Two kinds of bond randomness with the coupling coefficient obeying the Gaussian or uniform distribution are discussed. It is shown that the two kinds of disorder lead to similar thermodynamic behaviors if their variances take the same value. This result implies that the variance can be chosen as a characteristic parameter to evaluate the strength of the randomness. In addition, the Berezinskii-Kosterlitz-Thouless transition temperature decreases as the variance increases and the transition can even be destroyed as long as the disorder is strong enough.

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