Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 28: Nonlinear stochastic systems

DY 28.1: Vortrag

Donnerstag, 29. März 2007, 14:00–14:15, H2

Polymer translocation through a nanopore - A twodimensional Langevin dynamics study — •Dirk Hennig, Simon Fugmann, and Lutz Schimansky-Geier — Institut für Physik, Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin

We study the process of translocation of a polymer through a nanopore using a two-dimensional Langevin dynamics simulation. Initially the whole chain is placed on one side of the nanopore in a certain distance to the entrance of the latter. Special attention is paid to the influence of the chain length on the time it takes till the first segment of the chain enters the nanopore as well as the translocation time. It is demonstrated that depending on the flexibility of the chain and the width and longitudinal extension of the nanopore several translocation scenarios arise. For narrow nanopores the chain can pass the nanopore only in a completely stretched configuration whereas if the width of the nanopore is beyond a critical value the chain is translocated even in folded shape. Thus in the last case any segment of the chain can be the one that enters first the nanopore in contrast to the former case for which necessarily an end segment of the chain enters first the nanopore and is consecutively followed by the remaining segments.