Percolation of linear $k$-mers on square lattice: from isotropic through partially ordered to completely aligned state

Abstract

Numerical simulations by means of Monte Carlo method and finite-size scaling analysis have been performed to study the percolation behavior of linear $k$-mers (also denoted in the literature as rigid rods, needles, sticks) on two-dimensional square lattices $L\times L$ with periodic boundary conditions. Percolation phenomena are investigated for anisotropic relaxation random sequential adsorption of linear $k$-mers. Especially, effect of anisotropic placement of the objects on the percolation threshold has been investigated. Moreover, the behavior of percolation probability $R_L(p)$ that a lattice of size $L$ percolates at concentration $p$ has been studied in details in dependence on $k$, anisotropy and lattice size $L$. A nonmonotonic size dependence for the percolation threshold has been confirmed in isotropic case. We propose a fitting formula for percolation threshold $p_c=a/k^{\alpha }+b{\log }_{10}k+c$, where $a$, $b$, $c$, $\alpha$ are the fitting parameters varying with anisotropy. We predict that for large $k$-mers ($k⪆1.2\times 10^4$) isotropic placed at the lattice, percolation cannot occur even at jamming concentration.

11 pages, 12 figures

References in corpus (2)

• Critical behavior of long straight rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations
• Numerical results for crossing, spanning and wrapping in two-dimensional percolation