Interacting particles in a periodically moving potential: Traveling wave and transport

Abstract

We study a system of interacting particles in a periodically moving external potential, within the simplest possible description of paradigmatic symmetric exclusion process on a ring. The model describes diffusion of hardcore particles where the diffusion dynamics is locally modified at a uniformly moving defect site, mimicking the effect of the periodically moving external potential. The model, though simple, exhibits remarkably rich features in particle transport, such as polarity reversal and double peaks in particle current upon variation of defect velocity and particle density. By tuning these variables, the most efficient transport can be achieved in either direction along the ring. These features can be understood in terms of a traveling density wave propagating in the system. Our results could be experimentally tested, e.g., in a system of colloidal particles driven by a moving optical tweezer.

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Cited by in corpus (7)

• Collective Transport for Active Matter Run and Tumble Disk Systems on a Traveling Wave Substrate
• Pumping single-file colloids: Absence of current reversal
• Currents and flux-inversion in photokinetic active particles
• Symmetric exclusion processes on a ring with moving defects
• Current reversal in interacting colloids under time-periodic drive
• Persistent exclusion process with time-periodic drive
• Current reversals in driven lattice gases and Brownian motion