Defect Fluctuations and Lifetimes in Disordered Yukawa Systems

TL;DR

This study investigates defect fluctuations and lifetimes in disordered Yukawa particle systems, revealing temperature-dependent behaviors including white noise at high temperatures and 1/f noise with power law distributions at lower temperatures, highlighting defect fluctuations as a tool for characterizing dynamical heterogeneities.

Contribution

It provides new insights into the temperature-dependent defect dynamics and noise spectra in disordered Yukawa systems, linking defect fluctuations to dynamical heterogeneity.

Findings

White noise spectrum at high temperatures

1/f noise spectrum at low temperatures

Power law distribution of defect lifetimes at low temperatures

Abstract

We examine the time dependent defect fluctuations and lifetimes for a bidisperse disordered assembly of Yukawa particles. At high temperatures, the noise spectrum of fluctuations is white and the coordination number lifetimes have a stretched exponential distribution. At lower temperatures, the system dynamically freezes, the defect fluctuations exhibit a 1/f spectrum, and there is a power law distribution of the coordination number lifetimes. Our results indicate that topological defect fluctuations may be a useful way to characterize systems exhibiting dynamical heterogeneities.