Polymer translocation through a nanopore under a pulling force

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 similar to N-2 and translocation velocity v similar to 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 similar to F-2+nu-1 for moderate F, where nu is the Flory exponent, which finally crosses over to tau similar to F-1 for strong force. For narrow pores, even for moderate force tau similar to 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 the polymer is driven by an external force within the pore.