In this work we study the noise induced effects on the dynamics ofshort polymers crossing a potential barrier, in the presence of a metastable state.An improved version of the Rouse model for a flexible polymer has been adoptedto mimic the molecular dynamics by both taking into account the interactionsbetween adjacent monomers and introducing a Lennard-Jones potential betweenall beads. A bending recoil torque has also been included in our model. Thepolymer dynamics is simulated in a two-dimensional domain by numericallysolving the Langevin equations of motion with a Gaussian uncorrelated noise.We find a non-monotonic behavior of the mean first-passage time and the mostprobable translocation time of the polymer center of inertia as a function of thepolymer length at low noise intensity. We show how thermal fluctuations influencethe motion of short polymers, by inducing two different regimes of translocationin the molecule transport dynamics. In this context, the role played by the lengthof the molecule in the translocation time is investigated.
|Numero di pagine||10|
|Rivista||Journal of Statistical Mechanics: Theory and Experiment|
|Stato di pubblicazione||Published - 2009|
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