Site percolation and random walks on d-dimensional Kagome lattices

Details Site percolation and random walks on d-dimensional Kagome lattices Site percolation and random walks on d-dimensional Kagome lattices

1998-01-13

arxiv.org/abs/cond-mat/9801112v1

J. Phys. A: Math. Gen. 31 (1998) 3449--3460.

Physics

Condensed Matter

Statistical Mechanics

11 pages, LaTeX, 8 figures (EPS format), submitted to J. Phys. A

Scientific paper

10.1088/0305-4470/31/15/010

The site percolation problem is studied on d-dimensional generalisations of the Kagome' lattice. These lattices are isotropic and have the same coordination number q as the hyper-cubic lattices in d dimensions, namely q=2d. The site percolation thresholds are calculated numerically for d= 3, 4, 5, and 6. The scaling of these thresholds as a function of dimension d, or alternatively q, is different than for hypercubic lattices: p_c ~ 2/q instead of p_c ~ 1/(q-1). The latter is the Bethe approximation, which is usually assumed to hold for all lattices in high dimensions. A series expansion is calculated, in order to understand the different behaviour of the Kagome' lattice. The return probability of a random walker on these lattices is also shown to scale as 2/q. For bond percolation on d-dimensional diamond lattices these results imply p_c ~ 1/(q-1).

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