Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Poster I
DY 7.19: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Entropic Stochastic Resonance of a Flexible Polymer Chain in Confined System — •Zhen Zhang1,2, Hanshuang Chen3, and Zhonghuai Hou1,4 — 1Institute of Theoretical Physics, Technical University Berlin, Hardenbergstrasse 36, 10623, Berlin, Germany — 2Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China — 3School of Physics and Material Science, Anhui University, Hefei, Anhui, 230039, China — 4Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, China
We have investigated 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[1]. 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. Our study may shed new light on the understanding of polymer dynamics as well as its control in confined geometry, which is of great importance in biological systems.
[1] Zhen Zhang, Hanshuang Chen, and Zhonghuai Hou,Entropic stochastic resonance of a flexible polymer chain in a confined system, J. Chem. Phys. 137, 044904 (2012).