## Steady State Bifurcations for Phase Field Crystal Equations with underlying two Dimensional Kernel

- Arnaud Rougirel, Appolinaire Abourou, APPOLINAIRE ABOUROU
- 2015

- Published 2013 in Physical review. E, Statistical, nonlinear, and…

We introduce a new approach to represent a two-body direct correlation function (DCF) in order to alleviate the computational demand of classical density functional theory (CDFT) and enhance the predictive capability of the phase-field crystal (PFC) method. The approach utilizes a rational function fit (RFF) to approximate the two-body DCF in Fourier space. We use the RFF to show that short-wavelength contributions of the two-body DCF play an important role in determining the thermodynamic properties of materials. We further show that using the RFF to empirically parametrize the two-body DCF allows us to obtain the thermodynamic properties of solids and liquids that agree with the results of CDFT simulations with the full two-body DCF without incurring significant computational costs. In addition, the RFF can also be used to improve the representation of the two-body DCF in the PFC method. Last, the RFF allows for a real-space reformulation of the CDFT and PFC method, which enables descriptions of nonperiodic systems and the use of nonuniform and adaptive grids.

@article{PisuthaArnond2013ClassicalDF,
title={Classical density functional theory and the phase-field crystal method using a rational function to describe the two-body direct correlation function.},
author={N Pisutha-Arnond and Vincent Ws Chan and Mahesh V. Iyer and V. Gavini and Katsuyo Thornton},
journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
year={2013},
volume={87 1},
pages={013313}
}