Polymer translocation through a nanopore under a pulling force

Details Polymer translocation through a nanopore under a pulling force Polymer translocation through a nanopore under a pulling force

2006-08-23

arxiv.org/abs/cond-mat/0608499v3

Phys. Rev. E 75, 061912 (2007)

Physics

Condensed Matter

Soft Condensed Matter

submitted, 7 pages with 5 figures. To appear in PRE

Scientific paper

10.1103/PhysRevE.75.061912

We investigate polymer translocation through a nanopore under a pulling force using Langevin dynamics simulations. We concentrate on the influence of the chain length $N$ and the pulling force $F$ on the translocation time $\tau$. The distribution of $\tau$ is symmetric and narrow for strong $F$. We find that $\tau\sim N^{2}$ and translocation velocity $v\sim N^{-1}$ for both moderate and strong $F$. For infinitely wide pores, three regimes are observed for $\tau$ as a function of $F$. With increasing $F$, $\tau$ is independent of $F$ for weak $F$, and then $\tau\sim F^{-2+\nu^{-1}}$ for moderate $F$, where $\nu$ is the Flory exponent, which finally crosses over to $\tau\sim F^{-1}$ for strong force. For narrow pores, even for moderate force $\tau\sim F^{-1}$. Finally, the waiting time, for monomer $s$ and monomer $s+1$ to exit the pore, has a maximum for $s$ close to the end of the chain, in contrast to the case where polymer is driven by an external force within the pore.

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