Adaptive coupling of a deep neural network potential to a classical force field
Abstract
An adaptive modeling method (AMM) that couples a deep neural network potential and a classical force field is introduced to address the accuracy-efficiency dilemma faced by the molecular simulation community. The AMM simulated system is decomposed into three types of regions. The first type captures the important phenomena in the system and requires high accuracy, for which we use the Deep Potential Molecular Dynamics (DeePMD) model in this work. The DeePMD model is trained to accurately reproduce the statistical properties of the ab initio molecular dynamics. The second type does not require high accuracy, and a classical force field is used to describe it in an efficient way. The third type is used for a smooth transition between the first and the second types of regions. By using a force interpolation scheme and imposing a thermodynamics force in the transition region, we make the DeePMD region embedded in the AMM simulated system as if it were embedded in a system that is fully described by the accurate potential. A representative example of the liquid water system is used to show the feasibility and promise of this method.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 17, 2018
- Source ID
- 10.1063/1.5042714
Entities
People
- Han Wang
- Linfeng Zhang
- Weinan E
Organizations
- Beijing Institute of Big Data Research
- Institute of Applied Physics and Computational Mathematics
- National Natural Science Foundation of China
- Office of Naval Research
- Peking University
- Princeton University
- United States Department of Energy