Mechanical coupling in flashing ratchets

Details Mechanical coupling in flashing ratchets Mechanical coupling in flashing ratchets

2006-02-04

arxiv.org/abs/cond-mat/0602097v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, 10 figures

Scientific paper

10.1103/PhysRevE.73.051106

We consider the transport of rigid objects with internal structure in a flashing ratchet potential by investigating the overdamped behavior of a rod-like chain of evenly spaced point particles. In 1D, analytical arguments show that the velocity can reverse direction multiple times in response to changing the size of the chain or the temperature of the heat bath. The physical reason is that the effective potential experienced by the mechanically coupled objects can have a different symmetry than that of individual objects. All analytical predictions are confirmed by Brownian dynamics simulations. These results may provide a route to simple, coarse-grained models of molecular motor transport that incorporate an object's size and rotational degrees of freedom into the mechanism of transport.

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