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arXiv 0803.3334cond-mat.stat-mech
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具有第一和第二近邻排斥的三角形格子气的Monte Carlo研究

A Monte Carlo study of the triangular lattice gas with the first- and the second-neighbor exclusions

Wei Zhang, Youjin Deng

摘要:

我们制定了一个类似Swendsen-Wang版本的几何聚类算法。作为应用,我们研究了具有第一近邻和第二近邻排斥的三角晶格上的硬核格子气。数据分析采用有限尺度尺度,但由于数据有限,没有考虑对数修正的可能存在。我们确定临界化学势为$μ_c=1.75682 (2)$,临界粒子密度为$ρ_c=0.180(4)$。由Binder比$Q$和磁化率$χ$估计的热和磁指数$y_t=1.51(1) \approx 3/2$和$y_h=1.8748 (8) \approx 15/8$强烈支持该模型是4态Potts普适类的一般信念。另一方面,类能量的分析产生热指数$y_t$,范围从$1.440(5)$到$1.470(5)$。这些值与预期值3/2显著不同,因此意味着存在对数校正。

英文摘要:

We formulate a Swendsen-Wang-like version of the geometric cluster algorithm. As an application,we study the hard-core lattice gas on the triangular lattice with the first- and the second-neighbor exclusions. The data are analyzed by finite-size scaling, but the possible existence of logarithmic corrections is not considered due to the limited data. We determine the critical chemical potential as $μ_c=1.75682 (2)$ and the critical particle density as $ρ_c=0.180(4)$. The thermal and magnetic exponents $y_t=1.51(1) \approx 3/2$ and $y_h=1.8748 (8) \approx 15/8$, estimated from Binder ratio $Q$ and susceptibility $χ$, strongly support the general belief that the model is in the 4-state Potts universality class. On the other hand, the analyses of energy-like quantities yield the thermal exponent $y_t$ ranging from $1.440(5)$ to $1.470(5)$. These values differ significantly from the expected value 3/2, and thus imply the existence of logarithmic corrections.

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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