Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Statistical Physics far from Thermal Equilibrium

DY 17.12: Vortrag

Dienstag, 8. März 2016, 13:00–13:15, H48

Switching kinetics of a roadblock particle in an exclusion process — Mamata Sahoo¹ and •Stefan Klumpp^2,3 — ¹Computational Modelling & Simulation Section, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram -695019, India — ²Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany — ³Institute for Nonlinear Dynamics, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Motivated by complex transport processes occurring in nature, we study the switching dynamics of a "roadblock" particle in a totally asymmetric simple exclusion process (TASEP). The roadblock particle blocks the traffic of moving particles while bound to the lattice, but can stochastically unbind or switch off, thus enabling the traffic to pass. We use simulations to study the dependence of the particle flux on the on/off switching dynamics of the roadblock, which exhibits a surprisingly rich dynamic behaviour. In particular, unlike in other studied TASEP variants with defects, here we observe that the particle flux is affected by the roadblock even in the initiation-limited or low density phase if the roadblock dynamics is slow. Rapid switching off the roadblock results in the typical behaviour of a TASEP with a defect/pause with reduced maximal current, but no effect of the roadblock on the flux in the initiation-limited phase. Moreover, in an intermediate range of roadblock rates, the particle current is found to be system-size dependent.