Spin Glasses: A Ghost Story

TL;DR

This paper investigates the non-equilibrium dynamics of spin glasses through experiments and simulations, revealing memory effects consistent with the ghost domain scenario of the droplet scaling model.

Contribution

It provides comprehensive experimental and numerical evidence supporting the ghost domain scenario in different spin glass systems.

Findings

Memory phenomena are consistent across different spin glass systems.

Results support the droplet scaling model's predictions.

Experiments and simulations show similar characteristic features.

Abstract

Extensive experimental and numerical studies of the non-equilibrium dynamics of spin glasses subjected to temperature or bond perturbations have been performed to investigate chaos and memory effects in selected spin glass systems. Temperature shift and cycling experiments were performed on the strongly anisotropic Ising-like system {\ising} and the weakly anisotropic Heisenberg-like system {\AgMn}, while bond shift and cycling simulations were carried out on a 4 dimensional Ising Edwards-Anderson spin glass. These spin glass systems display qualitatively the same characteristic features and the observed memory phenomena are found to be consistent with predictions from the ghost domain scenario of the droplet scaling model.