Cited by 2,572Machine Learning in Materials ScienceAdvanced Chemical Physics StudiesAdvanced Physical and Chemical Molecular Interactions

On representing chemical environments

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Bartók, Albert P., Kondor, Risi, Csányi, Gábor·2013·Physical Review B

Abstract

We review some recently published methods to represent atomic neighborhood environments, and analyze their relative merits in terms of their faithfulness and suitability for fitting potential energy surfaces. The crucial properties that such representations (sometimes called descriptors) must have are differentiability with respect to moving the atoms and invariance to the basic symmetries of physics: rotation, reflection, translation, and permutation of atoms of the same species. We demonstrate that certain widely used descriptors that initially look quite different are specific cases of a general approach, in which a finite set of basis functions with increasing angular wave numbers are used to expand the atomic neighborhood density function. Using the example system of small clusters, we quantitatively show that this expansion needs to be carried to higher and higher wave numbers as the number of neighbors increases in order to obtain a faithful representation, and that variants of the descriptors converge at very different rates. We also propose an altogether different approach, called Smooth Overlap of Atomic Positions, that sidesteps these difficulties by directly defining the similarity between any two neighborhood environments, and show that it is still closely connected to the invariant descriptors. We test the performance of the various representations by fitting models to the potential energy surface of small silicon clusters and the bulk crystal.

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Crossref · 10.1103/physrevb.87.184115

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  • General-purpose and systematically-convergent descriptions of chemical environments provide a starting point that is considerably less biased than descriptors based on complicated heuristics that are designed from the outset to identify e.g. a stacking order, or the coordination of a site.

    “General-purpose and systematically-convergent descriptions of chemical environments, such as those that are typically used to fit potentials or predict molecular properties 31,35 , provide a starting point that is considerably less biased than descriptors based on complicated heuristics that are designed from the outset to identify e.g. a stacking order, or the coordination of a site.”

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Research works printed but not linked: 3

  1. 39 R. M. Neal, Bayesian Learning for Neural Networks , Ph.D. thesis, Department of Computer Science, University of Toronto (1995).
  2. 52 R. Kakarala, Triple correlation on groups , Ph.D. thesis, Department of Mathematics, UC Irvine (1992).
  3. 58 K. Kaufmann and W. Baumeister, Journal of Physics B: Atomic, Molecular and Optical Physics 22 , 1 (1989).

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Authors
Bartók, A. P., Kondor, R., & Csányi, G.
Affiliations
  • University of Cambridge (GB)
  • University of Chicago (US)
Venue
Physical Review B
Published
2013-05-28
Volume
87
Issue
18
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2029413789
Cited by
2,572
References
60
Citations by year
2026: 292 · 2025: 350 · 2024: 367 · 2023: 365 · 2022: 303 · 2021: 270 · 2020: 257 · 2019: 163 · 2018: 105 · 2017: 48 · 2016: 19 · 2015: 11 · 2014: 13 · 2013: 4 · 2012: 3
FWCI
7.07
Type
journal article
Language
en
Open access
Locations
  • Physical Review B (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Cambridge University Engineering Department Publications Database (submittedVersion)
  • arXiv (Cornell University)
Funders
Engineering and Physical Sciences Research Council (EP/K014560/1)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Machine Learning in Materials Science
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Chemical Physics Studies
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Advanced Physical and Chemical Molecular Interactions
Keywords
potential energy surface fitting, basis function expansion, silicon clusters, small clusters

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