Stochastic resonance in disordered charge-density-wave systems

TL;DR

This paper proposes that stochastic resonance can reveal key features of transient disordered states in photo-excited charge-density-wave systems, providing a new way to characterize hidden phases in many-body systems.

Contribution

It introduces the use of stochastic resonance to analyze ultrafast disordering in disordered charge-density-wave systems, linking spectral signatures to underlying stochastic dynamics.

Findings

Linear response peaks at specific temperatures indicate stochastic resonance.

Resonance reveals intrinsic transition timescales and energy barriers.

Method offers a new perspective to identify hidden disordered phases.

Abstract

Ultrafast disordering observed after photo-excitation challenges the conventional picture of photo-induced transitions where symmetry-breaking takes place along a single collective coordinate. We propose that key spectroscopic signatures of these transient disordered states can be revealed through stochastic resonance, a hallmark of nonlinear stochastic dynamics. Studying the disordered phase of Holstein model we show that, at given frequency, the linear response as a function of temperature has a peak, which indicates enhanced coherent switching between metastable configurations. From this resonance, we extract the intrinsic stochastic transition timescale and energy barrier separating equivalent local minima. This mechanism offers a new perspective to identify and characterize hidden disordered phases in driven many-body systems.