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A perturbation-method-based post-processing for the planewave discretization of Kohn–Sham models

Abstract : In this article, we propose a post-processing of the planewave solution of the Kohn–Sham LDA model with pseudopotentials. This post-processing is based upon the fact that the exact solution can be interpreted as a perturbation of the approximate solution, allowing us to compute corrections for both the eigenfunctions and the eigenvalues of the problem in order to increase the accuracy. Indeed, this post-processing only requires the computation of the residual of the solution on a finer grid so that the additional computational cost is negligible compared to the initial cost of the planewave-based method needed to compute the approximate solution. Theoretical estimates certify an increased convergence rate in the asymptotic convergence range. Numerical results confirm the low computational cost of the post-processing and show that this procedure improves the energy accuracy of the solution even in the pre-asymptotic regime which comprises the target accuracy of practitioners.
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https://hal.sorbonne-universite.fr/hal-01140818
Contributor : Geneviève Dusson <>
Submitted on : Thursday, April 9, 2015 - 3:41:16 PM
Last modification on : Monday, November 16, 2020 - 11:46:10 AM
Long-term archiving on: : Tuesday, April 18, 2017 - 3:41:42 PM

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  • HAL Id : hal-01140818, version 1

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Eric Cancès, Geneviève Dusson, Yvon Maday, Benjamin Stamm, Martin Vohralík. A perturbation-method-based post-processing for the planewave discretization of Kohn–Sham models. 2015. ⟨hal-01140818v1⟩

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