Molecular dynamics on nonequilibrium motion of a colloidal particle driven by an external torque. (6th February 2017)

• Record Type: Journal Article
• Authors: Yoo, Donghwan; Jung, Youngkyun; Kwon, Chulan
• Is Part Of: Journal of physics. Volume 50:Number 10(2017)
• Publication Date: 2017-02-06
• Subjects: molecular dynamics -- fluctuation theorem -- Gallavotti–Cohen symmetry; Mathematical physics -- Periodicals; Statistical physics -- Periodicals; Quantum theory -- Periodicals; Matter -- Properties -- Periodicals; 530.105
• DOI: 10.1088/1751-8121/aa56a8
• Languages: English
• ISSNs: 1751-8113

Abstract

Abstract: We investigate the motion of a colloidal particle driven out of equilibrium by an external torque. We use molecular dynamics simulation as an alternative to the Langevin dynamics. We prepare a heat bath composed of thousands of particles interacting with each other through the Lennard–Jones potential and impose the Langevin thermostat to maintain the heat bath in equilibrium. We consider a single colloidal particle interacting with with the particles of the heat bath also by the Lennard–Jones potential, without applying any types of dissipative or fluctuating forces used in Langevin dynamics. We set up simulation protocol fit for the overdamped limit as in real experiments, by increasing the size and mass of the colloidal particle. We study nonequilibrium fluctuations for work and heat produced incessantly in time and compare the results with those obtained from the previous studies via the overdamped Langevin dynamics. We confirm the Gallavotti–Cohen symmetry and the fluctuation theorem.