Separate length scale for coarsening and for fractal formation by persistent sites

TL;DR

This paper demonstrates a unique case where the length scale for ordered region growth and the correlation length for persistent sites evolve differently over time in a one-dimensional spin system, revealing distinct scaling behaviors.

Contribution

It introduces the first example of differing scaling for growth and correlation lengths in persistent site dynamics, with detailed analysis of fractal structures and exponents.

Findings

Domain growth exponent z=2.47±0.03

Persistence exponent θ=0.445±0.002

Correlation length exponent ζ=1.00±0.03

Abstract

We present the first example where length scale for the growth of ordered regions and the correlation length for the two point correlations of persistent sites scale differently with time. We do so by studying a global spin exchange dynamics in one dimension where a selected spin interacts with its two nearest domains. We found domain growth exponent $z=2.47\pm 0.03$ and the persistence exponent $\theta=0.445\pm0.002$, making $z\theta > d=1$. Unlike any previous study, we found correlation length of two point correlation of persistent sites grows in a power law with exponent $\zeta=1.00\pm 0.03$ by studying the fractal structure created by the persistent sites at the different stages of the dynamics and shown that fractal dimension is not related with any growth exponents.