Correction of Density-Functional-Theory based polynomial interatomic potentials to reproduce experimental melting properties

Abstract

Recently, we developed a method to construct polynomial interatomic potentials from ab-initio calculations in order to accurately describe laser excited solids [PRL 124, 085501 (2020)]. However, ab-initio methods, and therefore analytical potentials derived from them, commonly do not provide an accurate prediction of the melting temperature. In order to reproduce the experimental melting properties, but keeping the accuracy in the laser excited case, we present here an approach to modify few key coefficients of polynomial interatomic potentials constructed from ab-initio data. We show that, with the help of such corrections, the electronic-temperature dependent interatomic potential for silicon can, at the same time, describe nonthermal laser induced effects with ab-initio accuracy and also provide the correct experimental melting temperature and slope $dT/dp$.

arXiv comment27 pages, 14 figures, 4 tables

References in corpus (5)

• Analytic Interatomic Forces in the Random Phase Approximation
• Atomistic-continuum modeling of short laser pulse melting of Si targets
• Electron correlation and the phase diagram of Si
• Thermodynamic Behavior of a Model Covalent Material Described by the Environment-Dependent Interatomic Potential
• Self-learning analytical interatomic potential describing laser-excited silicon