Square lattice site percolation at increasing ranges of neighbor interactions

Details Square lattice site percolation at increasing ranges of neighbor interactions Square lattice site percolation at increasing ranges of neighbor interactions

2004-08-15

arxiv.org/abs/cond-mat/0408338v1

Phys. Rev. E71 (2005) 016125

Physics

Condensed Matter

Statistical Mechanics

4 pages, revtex4

Scientific paper

10.1103/PhysRevE.71.016125

We report site percolation thresholds for square lattice with neighbor interactions at various increasing ranges. Using Monte Carlo techniques we found that nearest neighbors (N$^2$), next nearest neighbors (N$^3$), next next nearest neighbors (N$^4$) and fifth nearest neighbors (N$^6$) yield the same $p_c=0.592...$. At odds, fourth nearest neighbors (N$^5$) give $p_c=0.298...$. These results are given an explanation in terms of symmetry arguments. We then consider combinations of various ranges of interactions with (N$^2$+N$^3$), (N$^2$+N$^4$), (N$^2$+N$^3$+N$^4$) and (N$^2$+N$^5$). The calculated associated thresholds are respectively $p_c=0.407..., 0.337..., 0.288..., 0.234...$. The existing Galam--Mauger universal formula for percolation thresholds does not reproduce the data showing dimension and coordination number are not sufficient to build a universal law which extends to complex lattices.

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