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Simulation Study of Passive Rod Diffusion in Active Bath:Nonmonotonic Length Dependence and Abnormal Translation-Rotation Coupling 被引量:1

活性浴中非活性棒的扩散动力学模拟研究:非单调尺寸依赖和反常平动-转动耦合
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摘要 Diffusion of tracer particles in active bath has attracted extensive attention in recent years.So far,most studies have considered isotropic spherical tracer particles,while the diffusion of anisotropic particles has rarely been involved.Here we investigate the diffusion dynamics of a rigid rod tracer in a bath of active particles by using Langevin dynamics simulations in a two-dimensional space.Particular attention is paid to how the translation(rotation)diffusion coefficient D_(T)(D_(R))change with the length of rod L and active strength Fa.In all cases,we find that rod exhibits superdiffusion behavior in a short time scale and returns to normal diffusion in the long time limit.Both D_(T) and D_(R) increase with Fa,but interestingly,a nonmonotonic dependence of D_(T)(D_(R))on the rod length has been observed.We have also studied the translation-rotation coupling of rod,and interestingly,a negative translation-rotation coupling is observed,indicating that rod diffuses more slowly in the parallel direction compared to that in the perpendicular direction,a counterintuitive phenomenon that would not exist in an equilibrium counterpart system.Moreover,this anomalous(diffusion)behavior is reentrant with the increase of Fa,suggesting two competitive roles played by the active feature of bath particles.
作者 Rui-kai Xu Hui-jun Jiang Zhong-huai Hou 许睿恺;江慧军;侯中怀(中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥230026)
出处 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第2期157-164,I0001,共9页 化学物理学报(英文)
基金 supported by the Ministry of Science and Technology of China(2016YFA0400904 and 2018YFA0208702) the National Natural Science Foundation of China(No.21973085,No.21833007,No.21790350,No.21673212,No.21521001 and No.21473165) the Fundamental Research Funds for the Central Universities(WK2340000074) Anhui Initiative in Quantum Information Technologies(AHY090200)。
关键词 Active particle Translation-rotation coupling Anomalous diffusion 活性粒子 平动-转动耦合 反常扩散
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