Logo of Science Foundation Ireland  Logo of the Higher Education Authority, Ireland7 Capacities
Ireland's High-Performance Computing Centre | ICHEC
Home | News | Infrastructure | Outreach | Services | Research | Support | Education & Training | Consultancy | About Us | Login


Title:Temperature Accelerated Monte Carlo (TAMC): A Method for Sampling the Free Energy Surface of Non-analytical Collective Variables
Authors:Ciccotti, Giovanni, and Simone Meloni, 2011
Abstract: We introduce a new method to simulate the physics of rare events. The method, an extension of the Temperature Accelerated Molecular Dynamics, comes in use when the collective variables introduced to characterize the rare events are either non-analytical or so complex that computing their derivative is not practical. We illustrate the functioning of the method by studying the homogeneous crystallization in a sample of Lennard-Jones particles. The process is studied by introducing a new collective variable that we call Effective Nucleus Size N. We have computed the free energy barriers and the size of critical nucleus, which result in agreement with data available in the literature. We have also performed simulations in the liquid domain of the phase diagram. We found a free energy curve monotonically growing with the nucleus size, consistent with the liquid domain.
ICHEC Project:Validation of a new method for the acceleration of atomistic simulations: application to the homogeneous nucleation of undercooled Lennard-Jones liquids.
Publication:Physical Chemistry Chemical Physics 13, no. 13 (2011): doi:10.1039/c0cp01335h
URL: http://pubs.rsc.org/en/content/articlelanding/2011/cp/c0cp01335h
Status: Published

return to publications list