Dissipation indicates memory formation in driven disordered systems

TL;DR

This paper demonstrates that dissipation can serve as a universal macroscopic indicator of memory in driven disordered systems, enabling memory readout through global measurements in materials like crumpled sheets and amorphous solids.

Contribution

It introduces a novel dissipation-based method to detect and read out memory of perturbations in disordered materials, applicable across different systems.

Findings

Dissipation transiently increases when surpassing the largest perturbation.

Memory effects are observable through global dissipation measurements.

The approach is validated in both crumpled sheets and 3D amorphous solids.

Abstract

Disordered and amorphous materials often retain memories of perturbations they have experienced since preparation. Studying such memories is a gateway to understanding this challenging class of systems, yet it often requires the ability to measure local structural changes in response to external drives. Here we show that dissipation is a generic macroscopic indicator for the memory of the largest perturbation. Through experiments in crumpled sheets under cyclic drive, we show that dissipation transiently increases when first surpassing the largest perturbation due to irreversible structural changes with unique statistics. This is used to devise novel memory readout protocols based on global observables only. The general applicability of this approach is demonstrated by revealing a similar memory effect in a three-dimensional amorphous solid.