Current reversal in interacting colloids under time-periodic drive
| Autor: | Punyabrata Pradhan, Shubhashis Rana, Sakuntala Chatterjee, Sanchari Goswami |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Ring (mathematics) Current (mathematics) Number density Statistical Mechanics (cond-mat.stat-mech) Condensed matter physics FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Molecular dynamics 0103 physical sciences Jump Rectangular potential barrier Particle 010306 general physics Scaling Condensed Matter - Statistical Mechanics |
| Zdroj: | Physical Review E. 98 |
| ISSN: | 2470-0053 2470-0045 |
| DOI: | 10.1103/physreve.98.052142 |
| Popis: | Using molecular dynamics simulations, we study particle-transport in a system of interacting colloidal particles on a ring, where the system is driven by a time-dependent external potential, moving along the ring. We consider two driving protocols: (i) the external potential barrier moves with a uniform velocity $v$ along the ring, and (ii) it moves in discrete jumps with jump-length $l$ and waiting time $\tau$ with an effective velocity $v=l/\tau$. The time-averaged (dc) particle current, which always remains positive in case (i), interestingly reverses its direction in case (ii) upon tuning the particle-number density $\rho_0$ and the effective barrier velocity $v$. We also find a scaling form for the current in terms of number density, barrier velocity, barrier height and temperature of the system. Comment: 10 pages,13 figures |
| Databáze: | OpenAIRE |
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