arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0901.1370cond-mat.stat-mech
收藏

二维渗流跃迁

Percolation transitions in two dimensions

Xiaomei Feng, Youjin Deng, Henk W. J. Blote

摘要:

通过转移矩阵计算和蒙特卡罗模拟,我们研究了几种二维晶格上的键渗流和位渗流模型。这些晶格包括具有最近邻键的正方形晶格、三角形晶格、蜂窝形晶格和切割晶格,以及具有最近邻键和次最近邻键的正方形晶格。结果提出的kagome和切割晶格的键渗流阈值,和广场,蜂窝和切割晶格的网站渗流阈值。我们还包括最近和次最近邻键的正方形晶格的键和位点渗流阈值。我们发现,根据库仑气体理论和共形不变性理论预测的第二温度维度$X_{t2}=4$的行为的标度校正。在几种情况下,有证据表明,有一个额外的条款与相同的指数,但修改了对数因子。只有在三角形格子上的渗流问题中,这样的对数项才显得很小或不存在。与$X_{t2}=4$相关的幂律校正的幅度被发现是依赖于相对于有限系统的圆柱形几何形状的晶格的取向。

英文摘要:

We investigate bond- and site-percolation models on several two-dimensional lattices numerically, by means of transfer-matrix calculations and Monte Carlo simulations. The lattices include the square, triangular, honeycomb kagome and diced lattices with nearest-neighbor bonds, and the square lattice with nearest- and next-nearest-neighbor bonds. Results are presented for the bond-percolation thresholds of the kagome and diced lattices, and the site-percolation thresholds of the square, honeycomb and diced lattices. We also include the bond- and site-percolation thresholds for the square lattice with nearest- and next-nearest-neighbor bonds. We find that corrections to scaling behave according to the second temperature dimension $X_{t2}=4$ predicted by the Coulomb gas theory and the theory of conformal invariance. In several cases there is evidence for an additional term with the same exponent, but modified by a logarithmic factor. Only for the site-percolation problem on the triangular lattice such a logarithmic term appears to be small or absent. The amplitude of the power-law correction associated with $X_{t2}=4$ is found to be dependent on the orientation of the lattice with respect to the cylindrical geometry of the finite systems.

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。

↑