Shear-induced anisotropic decay of correlations in hard-sphere colloidal glasses

TL;DR

This study investigates how shear influences the spatial correlations of microscopic fluctuations in colloidal glasses, revealing isotropic correlations under thermal dominance and anisotropic correlations when shear effects prevail, enhancing understanding of flow heterogeneity.

Contribution

It demonstrates the shear-induced transition from isotropic to anisotropic correlations in colloidal glasses through experiments and simulations, highlighting the interplay between shear and thermal relaxation.

Findings

Correlations are isotropic in thermally dominated regimes.

Correlations develop strong anisotropy under shear dominance.

Insights into flow heterogeneity in sheared amorphous solids.

Abstract

Spatial correlations of microscopic fluctuations are investigated via real-space experiments and computer simulations of colloidal glasses under steady shear. It is shown that while the distribution of one-particle fluctuations is always isotropic regardless of the relative importance of shear as compared to thermal fluctuations, their spatial correlations show a marked sensitivity to the competition between shear-induced and thermally activated relaxation. Correlations are isotropic in the thermally dominated regime, but develop strong anisotropy as shear dominates the dynamics of microscopic fluctuations. We discuss the relevance of this observation for a better understanding of flow heterogeneity in sheared amorphous solids.