Broad band noise and stochastic resonance in the CDW conductors K0.30MoO3 and K0.30Mo(1-x)WxO3 (x=0.001 and x=0.002)

TL;DR

This study explores how broad band noise and external white noise influence the nonlinear behavior and phase coherence in charge-density-wave conductors K0.30MoO3 and its tungsten-doped variants, revealing stochastic resonance effects.

Contribution

It demonstrates the coupling between internal broad band noise and external white noise enhances phase coherence in CDW conductors, a novel insight into noise effects in these materials.

Findings

White noise perturbation reduces average pulse amplitude.

Non-monotonous behavior observed with increasing pulse amplitude.

Coupling of noises may enhance phase coherence in CDW systems.

Abstract

We have investigated nonlinear characteristics and broad band noise in the quasi-one dimensional charge-density-wave conductors K0.30MoO3 and K0.30Mo(1-x)WxO3 (x=0.001 and x=0.002) When the amplitude of a bipolar rectangular voltage pulse excitation is modulated by adding a white noise perturbation, the average pulse amplitude is smaller than the unperturbed one and shows a non monotonous behaviour when the pulse amplitude is increased. Our findings suggest that coupling between internal broad band noise and external white noise may lead to an increase of phase coherence of the charge-density-wave.