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DY: Fachverband Dynamik und Statistische Physik

DY 33: Brownian Motion, Stochastic Processes, Transport I

DY 33.6: Vortrag

Donnerstag, 17. März 2011, 15:15–15:30, HÜL 186

Entropic transport in energetic potentials — P. Sekhar Burada¹, Yunyun Li², Wolfgang Riefler², and •Gerhard Schmid² — ¹MPI für Physik komplexer Systeme, Germany — ²Universität Augsburg, Germany

We study the transport of point size particles in micro-sized two dimensional periodic channels [1]. The channels exhibit periodically varying cross sections. The particles are subjected to a constant external force acting alongside the direction of the longitudinal channel axis and a varying force stemming from a periodic substrate potential. While particle transport in tilted periodic potentials is facilitated by noise, the transport through pores with periodically varying cross-section worsens with increasing noise level, i.e. increasing temperature. The competition between the noise-assisted propagation for energetic potentials and the hampered transport in confined structures leads to a striking, non-monotonic behavior which sensitively depend on the phase lag of the periodic channel structure and the periodic potential. By controlling this phase lag the symmetry could be broken and rectification observed.

[1] P.S. Burada, Y. Li, W. Riefler, G. Schmid, Chem.Phys. 375, 514 (2010).