Driven polymer translocation through nanopores: slow versus fast dynamics

Details Driven polymer translocation through nanopores: slow versus fast dynamics Driven polymer translocation through nanopores: slow versus fast dynamics

2009-11-25

arxiv.org/abs/0911.4809v1

EPL, 88, 68006 (2009)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 7 figures, to appear in EPL (Europhysics Letters)

Scientific paper

10.1209/0295-5075/88/68006

We investigate the dynamics of polymer translocation through nanopores under external driving by 3D Langevin Dynamics simulations, focusing on the scaling of the average translocation time $\tau$ versus the length of the polymer, $\tau\sim N^{\alpha}$. For slow translocation, i.e., under low driving force and/or high friction, we find $\alpha \approx 1+\nu \approx 1.588$ where $\nu$ denotes the Flory exponent. In contrast, $\alpha\approx 1.37$ is observed for fast translocation due to the highly deformed chain conformation on the trans side, reflecting a pronounced non-equilibrium situation. The dependence of the translocation time on the driving force is given by $\tau \sim F^{-1}$ and $\tau \sim F^{-0.80}$ for slow and fast translocation, respectively. These results clarify the controversy on the magnitude of the scaling exponent $\alpha$ for driven translocation.

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