TY - JOUR
T1 - Criteria for minimal model of driven polymer translocation
AU - Suhonen, Pauli
AU - Kaski, Kimmo
AU - Linna, Riku
PY - 2014
Y1 - 2014
N2 - 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 α, which describes the scaling of the translocation time with polymer length, when the driving force fp 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 trans side and fluctuations were excluded, gives rise to characteristics that are in stark contradiction with those of the complete model, for which α increases with fp. 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.
AB - 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 α, which describes the scaling of the translocation time with polymer length, when the driving force fp 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 trans side and fluctuations were excluded, gives rise to characteristics that are in stark contradiction with those of the complete model, for which α increases with fp. 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.
KW - translocation, polymer, dynamics, Langevin, computational physics
KW - translocation, polymer, dynamics, Langevin, computational physics
KW - translocation
KW - polymer
KW - dynamics
KW - Langevin
KW - computational physics
U2 - 10.1103/PhysRevE.90.042702
DO - 10.1103/PhysRevE.90.042702
M3 - Article
VL - 90
SP - 1
EP - 8
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 4
M1 - 042702
ER -