Accurate determination of crystal structures based on averaged local bond order parameters

Abstract

Local bond order parameters based on spherical harmonics, also known as Steinhardt order parameters, are often used to determine crystal structures in molecular simulations. Here we propose a modification of this method in which the complex bond order vectors are averaged over the first neighbor shell of a given particle and the particle itself. As demonstrated using soft particle systems, this averaging procedure considerably improves the accuracy with which different crystal structures can be distinguished.

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• Phase diagram of softly repulsive systems: The Gaussian and inverse-power-law potentials
• Molecular dynamics simulations of crystallization of hard spheres

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