具有能量子库的活性布朗粒子的动力学研究  

Dynamics of active Brownian particle with internal energy depot

作　　者：邱星 杨紫贝 夏诗琪 王海燕[1] QIU Xing;YANG Zi-bei;XIA Shi-qi;WANG Hai-yan(Department of Physics,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学物理学系,北京100875

出　　处：《大学物理》2021年第11期53-58,共6页College Physics

基　　金：国家自然科学基金重点资助项目(11735005)资助。

摘　　要：本文通过数值模拟研究了具有能量子库的活性布朗粒子动力学.首先,在自由场中,我们的计算表明活性布朗粒子不存在定向运动,而且均方位移随时间非线性变化.其次,在谐振子势中,我们发现粒子的自由扩散受到了限制,但相同时间内,活性布朗粒子的扩散区域比被动布朗粒子大.最后,在非对称周期势中,我们计算了活性布朗粒子的位置分布,同时计算不同势垒高度下,活性布朗粒子平均速度随时间的变化,结果表明活性布朗粒子能否将储存子库的能量转化为定向运动依赖于势垒高度.In the paper,the dynamics of active Brownian particle with internal energy depot is investigated by numerical simulation.First,for the free potential case,the results show that active Brownian particles do not perform directed motion and the mean squared displacement of active Brownian particle is a nonlinear function of time.Then in the harmonic potential case,we find that the free diffusion of particle is restricted and the range of diffusive motion of active Brownian particle is larger than that of passive Brownian particle during the same time interval.At last,for asymmetric period potential we calculate the distribution of the displacement of the active Brownian particle and the averaged velocity of the active Brownian particle change in time with different potential barriers.The results show whether or not active Brownian particle is able to transfer the depot energy into directed motion depends on the height of asymmetric potential barrier.

关 键 词：活性布朗粒子 内部能量子库 定向运动 

分 类 号：O4-1[理学—物理]