A variational approach to nucleation simulation

Abstract

We study by computer simulation the nucleation of a supersaturated Lennard-Jones vapor into the liquid phase. The large free energy barriers to transition make the time scale of this process impossible to study by ordinary molecular dynamics simulations.Therefore we use a recently developed enhanced sampling method [Valsson and Parrinello, Phys. Rev. Lett. 113, 090601 (2014)] based on the variational determination of a bias potential. We differ from previous applications of this method in that the bias is constructed on the basis of the physical model provided by the classical theory of nucleation. We examine the technical problems associated with this approach. Our results are very satisfactory and will pave the way for calculating the nucleation rates in many systems.

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References in corpus (3)

• Canonical sampling through velocity-rescaling
• Well-Tempered Metadynamics: A Smoothly Converging and Tunable Free-Energy Method
• A Variational Approach to Enhanced Sampling and Free Energy Calculations

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• Improving the Efficiency of Variationally Enhanced Sampling with Wavelet-Based Bias Potentials
• Simulations of Crystal Nucleation from Solution at Constant Chemical Potential