Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 792 - 798
Section General
Published online 03 May 2006
Europhys. Lett., 74 (5), pp. 792-798 (2006)
DOI: 10.1209/epl/i2006-10043-7

Ratchet cellular automata for colloids in dynamic traps

C. J. Olson Reichhardt and C. Reichhardt

Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA

received 13 February 2006; accepted in final form 13 April 2006
published online 3 May 2006

We numerically investigate the transport of kinks in a ratchet cellular automata geometry for colloids interacting with dynamical traps. We find that thermal effects can enhance the transport efficiency in agreement with recent experiments. At high temperatures we observe the creation and annihilation of thermally induced kinks that degrade the signal transmission. We consider both the deterministic and stochastic cases and show how the trap geometry can be adjusted to switch between these two cases. The operation of the dynamical trap geometry can be achieved with the adjustment of fewer parameters than ratchet cellular automata constructed using static traps.

05.40.-a. - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.40.Ca. - Noise.
82.70.Dd. - Colloids.

© EDP Sciences 2006