Exact steady-state velocity of ratchets driven by random sequential adsorption

Details Exact steady-state velocity of ratchets driven by random sequential adsorption Exact steady-state velocity of ratchets driven by random sequential adsorption

2007-03-28

arxiv.org/abs/cond-mat/0703742v2

J. Phys. A: Math. Theor. 40, 5575 (2007)

Physics

Condensed Matter

Statistical Mechanics

11 pages, 4 figures New asymptotic result for low chaperone density added. Exact translocation velocity is proportional to (ch

Scientific paper

10.1088/1751-8113/40/21/009

We solve the problem of discrete translocation of a polymer through a pore, driven by the irreversible, random sequential adsorption of particles on one side of the pore. Although the kinetics of the wall motion and the deposition are coupled, we find the exact steady-state distribution for the gap between the wall and the nearest deposited particle. This result enables us to construct the mean translocation velocity demonstrating that translocation is faster when the adsorbing particles are smaller. Monte-Carlo simulations also show that smaller particles gives less dispersion in the ratcheted motion. We also define and compare the relative efficiencies of ratcheting by deposition of particles with different sizes and we describe an associated "zone-refinement" process.

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