arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.04261cond-mat.stat-mech
收藏

外力矩驱动下胶粒非平衡运动的分子动力学研究

Molecular dynamics study on a nonequilibrium motion of a colloidal particle driven by an external torque

Donghwan Yoo, Youngkyun Jung, Chulan Kwon

摘要:

本文研究了在外力作用下胶体粒子脱离平衡的运动。我们使用的分子动力学模拟,是替代的数值积分方法的基础上的朗之万方程,并有望更逼真地模拟实验。我们选择了一个由成千上万的粒子通过Lennard-Jones势相互作用组成的热浴,并施加朗之万恒温器来保持平衡。我们制备了一个单一的胶体粒子与热浴中的粒子也通过Lennard-Jones势相互作用,而没有使用任何耗散力和噪声。通过增加胶体粒子的尺寸和质量,我们编制了适合于实际实验中过阻尼极限的仿真协议。研究了在时间上连续产生的功和热的非平衡涨落的随机性质。我们精确地证明了工作产生式的涨落定理。我们的结果与朗之万方程的数值积分结果一致。

英文摘要:

We investigate the motion of a colloidal particle driven out of equilibrium by an external torque. We use the molecular dynamics simulation that is alternative to the numerical integration approach based on the Langevin equation and is expected to mimic an experiment more realistically. We choose a heat bath composed of thousands of particles interacting to each other through the Lennard-Jones potential and impose the Langevin thermostat to maintain it in equilibrium. We prepare a single colloidal particle to interact with the particles of the heat bath also by the Lennard-Jones potential while any dissipative force and noise are not employed. We prepare the simulation protocol fit to the overdamped limit in real experiments by increasing the size and mass of the colloidal particle. We study the stochastic properties of the nonequilibrium fluctuations for work and heat produced incessantly in time. We accurately confirm the fluctuation theorem for the work production. We show our results to agree accurately with those from the numerical integration of the Langevin equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑