Abstract
Transport and diffusion of coupled Brownian particles in a spatially periodic potential are investigated under a constant biased force and two periodic driving forces. The impact of the periodic driving forces on the transport characteristics of coupled particles is discussed by Brownian dynamic simulation methods. The force–velocity relation which has been described for the coupled particles displays complex and rich behaviors, including absolute, nonlinear and differential negative mobilities. When the particle number or the coupled strength between particles increases, the anomalous transport and multiple current reversals will gradually disappear. In addition, we analyze anomalous diffusions (subdiffusion, superdiffusion and hyperdiffusion) corresponding to these anomalous mobilities. Meanwhile, we discuss physical mechanisms behind these findings via the mean square displacement, the probability distribution of the velocity and mobility coefficient of the coupled particles. Our results may contribute to further understanding of peculiar transport phenomena in the microworld.
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Data Availability Statement
This manuscript has associated data in a data repository.[Authors comment: In this paper, the transport characteristics of multiple particles are simulated and some anomalous diffusion and transport are found, which will help us to study the phenomena in the micro-world, but additional experimental studies need to be further developed. (https://doi.org/10.1103/PhysRevLett.124.075001), (https://doi.org/10.1103/PhysRevLett.117.174501). We have made substantial contributions to the conception or design of the work; or the acquisition analysis, or interpretation of data for the work; and we have approved the final version to be published; and we agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.]
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grants No. 12075090), the Yunnan Fundamental Research Projects (Grant No. 2019FI002 and 202101AS070018), the Key-Area Research and Development Program of Guangdong Province (Grant No. 2019B030330001), the Yunnan Province Ten Thousand Talents Plan Young and Elite Talents Project and Yunnan Province Computational Physics and Applied Science and Technology Innovation Team, and Science and Technology Program of Guangzhou (Grant No. 2019050001).
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Wang, Y., Zeng, C. & Ai, BQ. Anomalous transport and diffusion of coupled Brownian particles with periodic driving forces. Eur. Phys. J. Plus 136, 1071 (2021). https://doi.org/10.1140/epjp/s13360-021-02047-x
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DOI: https://doi.org/10.1140/epjp/s13360-021-02047-x