Double stochastic resonance in the mean-field $q$-state clock models

TL;DR

This paper investigates double stochastic resonance peaks in mean-field q-state clock models, revealing their occurrence across different q values and linking them to phase transition types.

Contribution

It demonstrates the presence of double resonance peaks in mean-field q-state clock models for all q≥4 and explores conditions for their occurrence in the three-state case.

Findings

Double peaks occur in all q≥4 models.

In the three-state model, double peaks depend on external frequency.

Double resonance is linked to phase transition nature.

Abstract

A magnetic system with a phase transition at temperature $T_c$ may exhibit double resonance peaks under a periodic external magnetic field because the time scale matches the external frequency at two different temperatures, one above $T_c$ and the other below $T_c$. We study the double resonance phenomena for the mean-field $q$-state clock model based on the heat-bath-typed master equation. We find double peaks as observed in the kinetic Ising case ($q=2$) for all $q\ge 4$, but for the three-state clock model ($q=3$), the existence of double peaks is possible only above a certain external frequency since it undergoes a discontinuous phase transition.