Dresden 2011 – wissenschaftliches Programm
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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).