Low-temperature dynamics of Long-Ranged Spin-Glasses : full hierarchy of relaxation times via real-space renormalization

TL;DR

This paper develops a real-space renormalization approach to analyze the full hierarchy of relaxation times in long-range spin-glasses, illustrating the droplet scaling theory with explicit dynamical barriers.

Contribution

It introduces a novel real-space renormalization method to explicitly construct the hierarchy of relaxation times in long-range spin-glasses at low temperature.

Findings

Hierarchy of relaxation times is explicitly constructed.

Dynamical barriers follow a specific probability distribution.

The approach confirms the droplet scaling theory in this context.

Abstract

We consider the long-ranged Ising spin-glass with random couplings decaying as a power-law of the distance, in the region of parameters where the spin-glass phase exists with a positive droplet exponent. For the Metropolis single-spin-flip dynamics near zero temperature, we construct via real-space renormalization the full hierarchy of relaxation times of the master equation for any given realization of the random couplings. We then analyze the probability distribution of dynamical barriers as a function of the spatial scale. This real-space renormalization procedure represents a simple explicit example of the droplet scaling theory, where the convergence towards local equilibrium on larger and larger scales is governed by a strong hierarchy of activated dynamical processes, with valleys within valleys.