Thermally activated barrier crossing and stochastic resonance of a flexible polymer chain in a piecewise linear bistable potential

Abstract

We study the stochastic resonance (SR) of a flexible polymer chain crossing over a piecewise linear bistable potential. The dependence of signal to noise ratio $SNR$ on noise intensity $D$, coupling constant $k$ and polymer length $N$ is studied via two state approximation. We find that the response of signal to the background noise strength is significant at optimum values of $D_{opt}$, $k_{opt}$ and $N_{opt}$ which suggests novel means of manipulating proteins or vesicles. Furthermore, the thermally activated barrier crossing rate $r_k$ for the flexible polymer chain is studied. We find that the crossing rate $r_k$ exhibits an optimal value at an optimal coupling constant $k_{opt}$; $k_{opt}$ decreases with $N$. As the chain length $N$ increases, the escape rate for the center of mass $r_k$ monotonously decreases. On the other hand, the crossing rate for the portion of polymer segment $r_s$ increases and saturates to a constant rate as $N$ steps up.

16 pages, 9 figures

References in corpus (4)

• Artificial Brownian motors: Controlling transport on the nanoscale
• Entropic Stochastic Resonance
• Non-Markovian Stochastic Resonance
• Modeling an efficient Brownian heat engine

Cited by in corpus (2)

• Noise-created bistability and stochastic resonance of impurities diffusing in a semiconductor layer
• Kramers problem for a dimer: effect of noise correlations