Connecting Structural Relaxation with the Low Frequency Modes in a Hard-Sphere Colloidal Glass

TL;DR

This paper links low frequency vibrational modes to structural relaxation in hard-sphere colloidal glasses, revealing that short-term mode analysis can predict long-term particle rearrangements.

Contribution

It demonstrates a strong spatial correlation between low frequency modes and long-term rearrangements, providing insight into the microscopic origins of relaxation.

Findings

Low frequency modes correlate with rearranging regions.

Normal mode analysis predicts long-term particle rearrangements.

Short-term mode analysis reveals structural relaxation mechanisms.

Abstract

Structural relaxation in hard-sphere colloidal glasses has been studied using confocal microscopy. The motion of individual particles is followed over long time scales to detect the rearranging regions in the system. We have used normal mode analysis to understand the origin of the rearranging regions. The low frequency modes, obtained over short time scales, show strong spatial correlation with the rearrangements that happen on long time scales.