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arXiv cond-mat/0701331cond-mat.stat-mechhep-latphysics.comp-ph
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自旋链的meron簇算法模拟

Spin chain simulations with a meron cluster algorithm

Thomas Boyer, Wolfgang Bietenholz, Jair Wuilloud

摘要:

我们应用一个meron集群算法的XY自旋链,它描述了一个量子转子。这是一个多集群模拟补充了一个改进的估计,它处理对象的半整数拓扑电荷。这种方法足够强大,可以为具有θ项的模型提供精确的结果-因此,它是可以数值求解具有复杂作用的系统的罕见示例之一。特别是我们测量的相关长度,以及拓扑和磁化率。我们讨论了算法的效率,鉴于临界减速。由于我们观察到的优异性能,这是强烈的动机,在更高的维度上的meron集群算法的新的应用工作。

英文摘要:

We apply a meron cluster algorithm to the XY spin chain, which describes a quantum rotor. This is a multi-cluster simulation supplemented by an improved estimator, which deals with objects of half-integer topological charge. This method is powerful enough to provide precise results for the model with a theta-term - it is therefore one of the rare examples, where a system with a complex action can be solved numerically. In particular we measure the correlation length, as well as the topological and magnetic susceptibility. We discuss the algorithmic efficiency in view of the critical slowing down. Due to the excellent performance that we observe, it is strongly motivated to work on new applications of meron cluster algorithms in higher dimensions.

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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