Aging behavior of spin glasses under bond and temperature perturbations from laser illumination

TL;DR

This study investigates how bond and temperature perturbations via laser illumination affect the nonequilibrium dynamics of spin glasses, revealing the roles of chaos and overlap length in their aging behavior.

Contribution

It introduces a method to study bond perturbations using photo illumination and demonstrates their impact on spin-glass dynamics and chaos phenomena.

Findings

Differences in magnetization dynamics between combined and temperature-only perturbations.

Overlap length decreases with bond perturbation, indicating chaos.

Crossover observed between weak and strong perturbation regimes.

Abstract

We have studied the nonequilibrium dynamics of spin glasses subjected to bond perturbation, which was based on the direct change in the spin-spin interaction $\Delta J$, using photo illumination in addition to temperature change $\Delta T$. Differences in time-dependent magnetization are observed between that under $\Delta T+\Delta J$ and $\Delta T$ perturbations with the same $\Delta T$. This differences shows the contribution of $\Delta J$ to spin-glass dynamics through the decrease in the overlap length. That is, the overlap length $L_{\Delta T+\Delta J}$ under $\Delta T+\Delta J$ perturbation is less than $L_{\Delta T}$ under $\Delta T$ perturbation. Furthermore, we observe the crossover between weakly and strongly perturbed regimes under bond cycling accompanied by temperature cycling. These effects of bond perturbation strongly indicates the existence of both chaos and the overlap length.