Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Brownian Motion and Transport
DY 25.10: Talk
Thursday, March 29, 2012, 12:15–12:30, MA 004
Directed Transport of Confined Brownian Particles with Torque — •Paul Radtke and Lutz Schimansky-Geier — Institute of Physics, Humboldt University of Berlin, Germany
We investigate the influence of an external magnetic field (torque) on the motion of Brownian particles confined in a channel geometry with varying width. Furthermore, the particles are driven by random fluctuations modeled by the Ornstein-Uhlenbeck process (OUP) with given correlation time τc. The latter is implemented as both as thermal and nonthermal process.
In contrast to the thermal OUP for the nonthermal process directed transport emerges, our setup now realizes a ratchet mechanism: Due to the assumed thermodynamic nonequilibrium situation random fluctuations are rectified. The transport quantities of the system are studied in detail with respect to the correlation time, the torque and the channel geometry. Eventually, the mechanism of the symmetry breaking is elucidated.