While the characteristics of the driven translocation for asymptotically long polymers are well understood, this is not the case for finite-sized polymers, which are relevant for real-world experiments and simulation studies. Most notably, the behavior of the exponent \alpha, which describes the scaling of the translocation time with polymer length, when the driving force f_p in the pore is changed, is under debate. By Langevin dynamics simulations of regular and modified translocation models  we find that an incomplete model, where the trans side is {\it   excluded, gives rise to characteristics that are in stark contradiction with those of the complete model, for which \alpha increases with f_p. Our results suggest that contribution due to fluctuations is important. We construct a minimal model where dynamics is completely excluded to show that close alignment with a full translocation model can be achieved. Our findings set very stringent requirements for a minimal model that is supposed to describe the driven polymer translocation correctly.
While the characteristics of the driven translocation for asymptotically long polymers are well understood, this is not the case for finite-sized polymers, which are relevant for real-world experiments and simulation studies. Most notably, the behavior of the exponent \alpha, which describes the scaling of the translocation time with polymer length, when the driving force f_p in the pore is changed, is under debate. By Langevin dynamics simulations of regular and modified translocation models using the freely-jointed-chain polymer model we find that a previously reported incomplete model, where the {\it trans side and fluctuations were excluded, gives rise to characteristics that are in stark contradiction with those of the complete model, for which \alpha increases with f_p. Our results suggest that contribution due to fluctuations is important. We construct a minimal model where dynamics is completely excluded to show that close alignment with a full translocation model can be achieved. Our findings set very stringent requirements for a minimal model that is supposed to describe the driven polymer translocation correctly.
A
using the freely-jointed-chain polymer model
R
an
a previously reported
D
trans side is
A
trans
A
side and fluctuations were