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We investigate the dynamics of polymer translocation through a nanopore usingtwo-dimensional Langevin dynamics simulations. In the absence of externaldriving force, we consider a polymer which is initially placed in the middle ofthe pore and study the escape time $\tau_e$ required for the polymer tocompletely exit the pore on either side. The distribution of the escape timesis wide and has a long tail. We find that $\tau_e$ scales with the chain length$N$ as $\tau_e \sim N^{1+2\nu}$, where $\nu $ is the Flory exponent. For driventranslocation, we concentrate on the influence of the friction coefficient$\xi$, the driving force $E$ and the length of the chain $N$ on thetranslocation time $\tau$, which is defind as the time duration between thefirst monomer entering the pore and the last monomer leaving the pore. Forstrong driving forces, the distribution of translocation times is symmetric andnarrow without a long tail and $\tau \sim E^{-1}$. The influence of $\xi$depends on the ratio between the driving and frictional forces. Forintermediate $\xi$, we find a crossover scaling for $\tau$ with $N$ from $\tau\sim N^{2\nu}$ for relatively short chains to $\tau \sim N^{1 + \nu}$ forlonger chains. However, for higher $\xi$, only $\tau \sim N^{1 + \nu}$ isobserved even for short chains, and there is no crossover behavior. This resultcan be explained by the fact that increasing $\xi$ increases the Rouserelaxation time of the chain, in which case even relatively short chains haveno time to relax during translocation. Our results are in good agreement withprevious simulations based on the fluctuating bond lattice model of polymers atintermediate friction values, but reveals additional features of dependency onfriction.Comment: submitted to J. Chem. Phys., 8 pages with 10 figure

Langevin dynamics simulations of polymer translocation through nanopores