Bona fide stochastic resonance under nonGaussian active fluctuations

TL;DR

This paper experimentally demonstrates a new form of stochastic resonance in a nanoscale system driven by non-Gaussian active noise, revealing resonance peaks without periodic forcing and showing how nonGaussian kicks can restore SR under periodic modulation.

Contribution

It introduces the concept of bona fide stochastic resonance driven by nonGaussian active fluctuations without periodic modulation, supported by experimental evidence and a simple explanatory model.

Findings

Resonance peaks occur at multiples of the mean pulse interval

Maximum resonance when mean residence time matches specific conditions

NonGaussian kicks can recover SR degraded by correlated noise

Abstract

We report on the experimental observation of stochastic resonance (SR) in a nonGaussian active bath without any periodic modulation. A Brownian particle hopping in a nanoscale double-well potential under the influence of nonGaussian correlated noise, with mean interval ${{\tau }_{P}}$ and correlation time ${{\tau }_{c}}$, shows a series of equally-spaced peaks in the residence time distribution at integral multiples of ${{\tau }_{P}}$. The strength of the first peak is found to be maximum when the mean residence time ${{\bar{\tau }}_{d}}$ matches the double condition, $4{{\tau }_{c}}\approx {{\tau }_{P}}\approx {{\bar{\tau }}_{d}}\text{/}2$, demonstrating a new type of bona fide SR. The experimental findings agree with a simple model that explains the emergence of SR without periodic modulation of the double-well potential. Additionally, we show that generic SR under periodic modulation, known to degrade in strongly correlated continuous noise, is recovered by the discrete nonGaussian kicks.