Probability distributions for polymer translocation

Chatelain, Clément; Kantor, Yacov; Kardar, Mehran

Probability distributions for polymer translocation

Authors

Chatelain, Clément

Kantor, Yacov

Kardar, Mehran

Description

We study the passage (translocation) of a self-avoiding polymer through a membrane pore in two dimensions. In particular, we numerically measure the probability distribution Q(T) of the translocation time T, and the distribution P(s,t) of the translocation coordinate s at various times t. When scaled with the mean translocation time <T>, Q(T) becomes independent of polymer length, and decays exponentially for large T. The probability P(s,t) is well described by a Gaussian at short times, with a variance that grows sub-diffusively as t^α with α~0.8. For times exceeding <T>, P(s,t) of the polymers that have not yet finished their translocation has a non-trivial stable shape.
5 pages, 4 figures