Title: Guidelines for creating artificial neural network empirical interatomic potential from first-principles molecular dynamics data under specific conditions and its application to $$α$$-Ag₂Se

Abstract

First-principles molecular dynamics (FPMD) simulations are highly accurate, but due to their high calculation cost, the computational scale is often limited to hundreds of atoms and few picoseconds under specific temperature and pressure conditions. As such, we present here the guidelines for creating artificial neural network empirical interatomic potential (ANN potential) trained with such a limited FPMD data, which can perform long time scale MD simulations at least under the same conditions. The FPMD data for training are prepared on the basis of the convergence of radial distribution function [$g(r)$]. While training the ANN using total energy and atomic forces of the FPMD data, the error of pressure is also monitored and minimized. To create further robust potential, we add a small amount of FPMD data to reproduce the interaction between two atoms that are close to each other. ANN potentials for $$α$$-Ag₂Se were created as an application example, and it has been confirmed that not only $g(r)$ and mean square displacements but also the specific heat requiring a long time scale simulation matched the FPMD and the experimental values. In addition, the MD simulation using the ANN potential achieved over 10⁴ acceleration over the FPMD one. The guidelines proposed here mitigate the creation difficulty of the ANN potential, and a lot of FPMD data sleeping on the hard disk after the research may be put on the front stage again.

Authors:

Shimamura, Kohei  ^[1];

• Search DOE PAGES for author "Shimamura, Kohei"
• Search DOE PAGES for ORCID "0000-0003-3235-2599"

Fukushima, Shogo ^[2]; Koura, Akihide ^[2]; Shimojo, Fuyuki ^[2]; Misawa, Masaaki ^[3]; Kalia, Rajiv K. ^[4]; Nakano, Aiichiro  ^[4];

• Search DOE PAGES for author "Nakano, Aiichiro"
• Search DOE PAGES for ORCID "0000-0003-3228-3896"

Vashishta, Priya ^[4]; Matsubara, Takashi ^[1]; Tanaka, Shigenori ^[1]

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+ Show Author Affiliations

1. Kobe Univ. (Japan)
2. Kumamoto Univ. (Japan)
3. Kyushu Sangyo Univ., Fukuoka (Japan)
4. Univ. of Southern California, Los Angeles, CA (United States)

Publication Date:

Wed Sep 25 00:00:00 EDT 2019

Research Org.:

Univ. of Southern California, Los Angeles, CA (United States)

Sponsoring Org.:

Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); Japan Science and Technology Agency (JST); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

OSTI Identifier:

1612871

Grant/Contract Number:  

SC0018195; 16K05478; 17H06353; 18K03825; 19K14676; JPMJCR18I2

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Chemical Physics

Additional Journal Information:

Journal Volume: 151; Journal Issue: 12; Journal ID: ISSN 0021-9606

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Physics; Artificial neural networks; Potential energy surfaces; Symmetry functions; Molecular dynamics; Interatomic potentials; First-principle calculations; Thermodynamic properties