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Abstract: We study the passage times of a translocating polymer of length $N$ in threedimensions, while it is pulled through a narrow pore with a constant force $F$applied to one end of the polymer. At small to moderate forces, satisfying thecondition $FN^{ u}-k BT\lesssim1$, where $ u\approx0.588$ is the Floryexponent for the polymer, we find that $\tau N$, the mean time the polymertakes to leave the pore, scales as $N^{2+ u}$ independent of $F$, in agreementwith our earlier result for F=0. At strong forces, i.e., for$FN^{ u}-k BT\gg1$, the behaviour of the passage time crosses over to$\tau N\sim N^2-F$. We show here that these behaviours stem from the polymerdynamics at the immediate vicinity of the pore - in particular, the memoryeffects in the polymer chain tension imbalance across the pore.



Author: Debabrata Panja, Gerard T. Barkema

Source: https://arxiv.org/







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