W. L. Reenbohn, S. S. Pohlong, Mangal C. Mahato
The phenomenon of Stochastic Resonance (SR) has been conclusively
demonstrated in bistable potentials. However, SR in sinusoidal potentials have
only recently been shown numerically to occur in terms of hysteresis loop area.
We show that the occurrence of SR is not specific to sinusoidal potentials and
can occur in periodic bistable potential, $U(x)=2/3(\cos x +\cos 2x)$, as well.
We further show that SR can occur even in a washboard potential, where
hysteresis loops normally do not close because of average drift of particles.
Upon correcting for the drift term, the closed hysteresis loop area (input
energy loss) shows the usual SR peaking behaviour as also the signal-to-noise
ratio in a limited domain in the high drive-frequency range. The occurrence of
SR is attributed to the existence of effectively two dynamical states in the
driven periodic sinusoidal and periodic bistable potentials. The same
explanation holds also when the periodic potentials are tilted by a small
constant slope.
View original:
http://arxiv.org/abs/1202.0880
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