Machine Learning for Accurate Force Calculations in Molecular Dynamics Simulations

The computationally expensive nature of ab initio molecular dynamics simulations severely limits its ability to simulate large system sizes and long time scales, both of which are necessary to imitate experimental conditions. In this work, we explore an approach to make use of the data obtained using the quantum mechanical density functional theory (DFT) on small systems and use deep learning to subsequently simulate large systems by taking liquid argon as a test case. A suitable vector representation was chosen to represent the surrounding environment of each Ar atom, and a Δ-NetFF machine learning model, where the neural network was trained to predict the difference in resultant forces obtained by DFT and classical force fields, was introduced. Molecular dynamics simulations were then performed using forces from the neural network for various system sizes and time scales depending on the properties we calculated. A comparison of properties obtained from the classical force field and the neural network model was presented alongside available experimental data to validate the proposed method.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:124

Enthalten in:

The journal of physical chemistry. A - 124(2020), 34 vom: 27. Aug., Seite 6954-6967

Sprache:

Englisch

Beteiligte Personen:

Pattnaik, Punyaslok [VerfasserIn]
Raghunathan, Shampa [VerfasserIn]
Kalluri, Tarun [VerfasserIn]
Bhimalapuram, Prabhakar [VerfasserIn]
Jawahar, C V [VerfasserIn]
Priyakumar, U Deva [VerfasserIn]

Links:

Volltext

Themen:

Journal Article

Anmerkungen:

Date Completed 09.09.2020

Date Revised 09.09.2020

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1021/acs.jpca.0c03926

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM313617325