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Deep learning of accurate force field of ferroelectric HfO 2

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4]
  1. Fudan Univ., Shanghai (China); Westlake Univ., Zhejiang (China); Westlake Inst. for Advanced Study, Zhejiang (China); OSTI
  2. Peking Univ., Beijing (China)
  3. Princeton Univ., NJ (United States)
  4. Westlake Univ., Zhejiang (China); Westlake Inst. for Advanced Study, Zhejiang (China); Key Lab. for Quantum Materials of Zhejiang Province, Zhejiang (China)
The discovery of ferroelectricity in HfO2-based thin films opens up new opportunities for using this silicon-compatible ferroelectric to realize low-power logic circuits and high-density nonvolatile memories. The functional performances of ferroelectrics are intimately related to their dynamic responses to external stimuli such as electric fields at finite temperatures. Molecular dynamics is an ideal technique for investigating dynamical processes on large length and time scales, though its applications to new materials are often hindered by the limited availability and accuracy of classical force fields. Here we present a deep neural network–based interatomic force field of HfO2 learned from ab initio data using a concurrent learning procedure. The model potential is able to predict structural properties such as elastic constants, equation of states, phonon dispersion relationships, and phase transition barriers of various hafnia polymorphs with accuracy comparable with density functional theory calculations. Here, the validity of this model potential is further confirmed by the reproduction of experimental sequences of temperature-driven ferroelectric-paraelectric phase transitions of HfO2 with isobaric-isothermal ensemble molecular dynamics simulations. We suggest a general approach to extend the model potential of HfO2 to related material systems including dopants and defects.
Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE Office of Science (SC); Westlake Education Foundation
Grant/Contract Number:
SC0019394
OSTI ID:
1853191
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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