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arXiv 1102.1222cond-mat.stat-mech
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具有双二次相互作用的经典反铁磁Heisenberg模型的Loop算法

Loop algorithm for classical antiferromagnetic Heisenberg models with biquadratic interactions

Hiroshi Shinaoka, Yusuke Tomita, Yukitoshi Motome

摘要:

采用标准单自旋翻转算法的蒙特卡罗模拟在低温下对受抑自旋系统的整个位形空间采样时常常失败。一个典型的例子是一类自旋冰型伊辛模型。在这种情况下,可以通过引入全局翻转算法,循环算法来避免困难。在O(3)Heisenberg模型中,当存在双二次相互作用时,也遇到了类似的困难.然而,环路算法并不直接应用于这种情况,因为系统不具有用于构造环路的先验自旋各向异性轴。我们提出了一个扩展的循环算法的双线性双二次模型。在蒙特卡罗模拟中,对三种不同的方法在环路上翻转自旋的效率进行了测试。我们表明,最有效的方法取决于双二次相互作用的强度。

英文摘要:

Monte Carlo simulation using the standard single-spin flip algorithm often fails to sample over the entire configuration space at low temperatures for frustrated spin systems. A typical example is a class of spin-ice type Ising models. In this case, the difficulty can be avoided by introducing a global-flip algorithm, the loop algorithm. Similar difficulty is encountered in O(3) Heisenberg models in the presence of biquadratic interaction. The loop algorithm, however, is not straightforwardly applied to this case, since the system does not have a priori spin-anisotropy axis for constructing the loops. We propose an extension of the loop algorithm to the bilinear-biquadratic models. The efficiency is tested for three different ways to flip spins on a loop in Monte Carlo simulation. We show that the most efficient method depends on the strength of the biquadratic interaction.

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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