论文标题
层次晶格中渗透的重新规范化组方法
Renormalization Group Approach to Percolation in Hierarchical Lattices
论文作者
论文摘要
渗透是指与无序系统特性有关的有趣类别的问题,这些问题通常是根据随机放置在基础晶格或连续体上的物体而定的。尽管设置的简单性,但大多数渗透性系统都会从具有许多不相交簇的断开状态过渡到将晶格位点有限分数连接到单个群集的状态。与热力学相变的情况一样,幂律依赖性通常在临界渗滤阈值附近。这些依赖性的起源可以通过缩放和翻新的镜头来理解,实际上,可以使用这些工具获得许多定量结果。在本文中,我们研究了分层晶格上的渗透问题,在该晶格中,可以从拆卸程序中获得关键指数的确切结果。我们计算完整的几何临界指数的分析结果,并确认它们与仿真的一致性。最后,我们为系统的电导率建立了一个有趣的重新归一化组,并将其用于计算提取电导率指数t。
Percolation refers to an interesting class of problems related to the properties of disordered systems, usually formulated in terms of objects randomly placed on an underlying lattice or continuum. Despite the simplicity of the setup, most percolative systems undergo a phase transition from a disconnected state with many disjoint clusters to a state where a finite fraction of the lattice sites are connected to a single cluster. As in the case of thermodynamic phase transitions, power law dependencies generically near the critical percolation threshold. The origin of these dependencies can be understood through the lens of scaling and renormalization, and indeed many quantitative results can be acquired using these tools. In this paper we study the percolation problem on a hierarchical lattice, where exact results for the critical exponents can be obtained from a decimation procedure. We calculate analytic results for the full set of geometric critical exponents and confirm their consistency with simulation. Finally, we set up an interesting renormalization group for the conductivity of the system and use it to computationally extract the conductivity exponent t.