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J Chem Phys. 2012 Jul 28;137(4):044904. doi: 10.1063/1.4737638.

Entropic stochastic resonance of a flexible polymer chain in a confined system.

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Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.


We have studied the dynamics of a flexible polymer chain in constrained dumb-bell-shape geometry subject to a periodic force and external noise along the longitudinal direction. It is found that the system exhibits a feature of entropic stochastic resonance (ESR), i.e., the temporal coherence of the polymer motion can reach a maximum level for an optimal noise intensity. We demonstrate that the occurrence of ESR is robust to the change of chain length, while the bottleneck width should be properly chosen. A gravity force in the vertical direction is not necessary for the ESR here, however, the elastic coupling between polymer beads is crucial.

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