# Signature of Dynamical Heterogeneity in Spatial Correlations of Particle Displacement and its Temporal Evolution in Supercooled Liquids

## TL;DR

This study uses molecular dynamics simulations to analyze the spatial and temporal evolution of dynamic heterogeneity in supercooled liquids, revealing its persistence across multiple relaxation timescales and its temperature-dependent length scale.

## Contribution

The paper provides detailed insights into the temporal evolution and temperature dependence of dynamic heterogeneity and its length scale in supercooled liquids through extensive simulations.

## Key findings

- Dynamic heterogeneity peaks near the alpha-relaxation time.
- Heterogeneity exists at the beta-relaxation timescale and persists up to several alpha-relaxation times.
- Heterogeneity length scale's temperature dependence remains consistent over time.

## Abstract

The existence of heterogeneity in the dynamics of supercooled liquids is believed to be one of the hallmarks of the glass transition. Intense research has been carried out in the past to understand the origin of this heterogeneity in dynamics and a possible length scale associated with it. We have done extensive molecular dynamics simulations of few model glass-forming liquids in three dimensions to understand the temporal evolution of the dynamic heterogeneity and the heterogeneity length scale. We find that although the strength of the dynamic heterogeneity is maximum at a timescale close to characteristic $\alpha$-relaxation time of the system, dynamic heterogeneity itself is well-developed at timescale as short as $\beta$-relaxation time and survives up to a timescale as long as few tens of $\alpha$-relaxation time. Moreover, we discovered that temperature dependence of heterogeneity length remains the same in the whole time window although its absolute value changes over time in a non-monotonic manner.