Discontinuous percolation transitions in real physical systems

Details Discontinuous percolation transitions in real physical systems Discontinuous percolation transitions in real physical systems

2011-05-05

arxiv.org/abs/1105.0982v2

Physical Review E, 84, 050102(R)(2011)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures

Scientific paper

We study discontinuous percolation transitions (PT) in the diffusion-limited cluster aggregation model of the sol-gel transition as an example of real physical systems, in which the number of aggregation events is regarded as the number of bonds occupied in the system. When particles are Brownian, in which cluster velocity depends on cluster size as $v_s \sim s^{\eta}$ with $\eta=-0.5$, a larger cluster has less probability to collide with other clusters because of its smaller mobility. Thus, the cluster is effectively more suppressed in growth of its size. Then the giant cluster size increases drastically by merging those suppressed clusters near the percolation threshold, exhibiting a discontinuous PT. We also study the tricritical behavior by controlling the parameter $\eta$, and the tricritical point is determined by introducing an asymmetric Smoluchowski equation.

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