Bona fide stochastic resonance under nonGaussian active fluctuations

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.

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