Universality class of isotropic on-lattice Eden clusters

Details Universality class of isotropic on-lattice Eden clusters Universality class of isotropic on-lattice Eden clusters

2006-11-06

arxiv.org/abs/cond-mat/0611160v1

J. Phys. A: Math. Theor. 40 F43 2007

Physics

Condensed Matter

Statistical Mechanics

To appear in J. Phys. A: Math. Gen

Scientific paper

10.1088/1751-8113/40/1/F05

The shape of large on-lattice Eden clusters grown from a single seed is ruled by the underlying lattice anisotropy. This is reflected on the linear growth with time of the interface width ($w\sim t$), in contrast with the KPZ universality class ($w\sim t^{1/3}$) observed when the Eden model is grown on flat substrates. We propose an extended Eden model, in which the growth probability has a power law dependence with the number of occupied nearest neighbors. Large scale simulations ($N\gtrsim 4\times 10^9$ particles) were used to determine the time evolution of $w$. We found that a suitable choice of the power exponent removes the lattice-induced cluster anisotropy and provides a growth exponent in very good agreement with the KPZ universality class. Also, the present model corroborates the results found in off-lattice simulations, in which the center of mass fluctuations are considered in the interface scaling analysis.

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