2015/06/05 by Robert Gernert, Sabine H. L. Klapp · 19 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Chemistry #Colloid #Computer science #Control (management) #Control theory (sociology) #Engineering #Feedback control #Gaussian #Material Dynamics and Properties #Mechanical and Optical Resonators #Particle (ecology) #Physics #Position (finance) #Quantum mechanics #Statistical physics #Trap (plumbing) #cond-mat.soft
paper · pdf · doi:10.1103/physreve.92.022132
published in Physical Review E 92(2), 022132 (American Physical Society) · 10 pages, 10 figures
arxiv created 2015/06/05 · openalex publication_date 2015/08/21 · arxiv updated 2015/08/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Feedback control schemes are a promising way to manipulate transport properties of driven colloidal suspensions. In the present article, we suggest a feedback scheme to enhance the collective transport of colloidal particles with repulsive interactions through a one-dimensional tilted washboard potential. The control is modeled by a harmonic confining potential, mimicking an optical "trap," with the center of this trap moving with the (instantaneous) mean particle position. Our theoretical analysis is based on the Smoluchowski equation combined with dynamical density functional theory for systems with hard-core or ultrasoft (Gaussian) interactions. For either type of interaction, we find that the feedback control can lead to an enhancement of the mobility by several orders of magnitude relative to the uncontrolled case. The largest effects occur for intermediate stiffness of the trap and large particle numbers. Moreover, in some regions of the parameter space the feedback control induces oscillations of the mean velocity. Finally, we show that the enhancement of mobility is robust against a small time delay in implementing the feedback control.