Direct Minimization for Ensemble Electronic Structure Calculations

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Abstract

We consider a direct optimization approach for ensemble density functional theory electronic structure calculations. The update operator for the electronic orbitals takes the structure of the Stiefel manifold into account and we present an optimization scheme for the occupation numbers that ensures that the constraints remain satisfied. We also compare sequential and simultaneous quasi-Newton and nonlinear conjugate gradient optimization procedures, and demonstrate that simultaneous optimization of the electronic orbitals and occupation numbers improve performance compared to the sequential approach.

Details

Original languageEnglish
Pages (from-to)1218-1233
Number of pages16
JournalJOURNAL OF SCIENTIFIC COMPUTING
Volume66
Issue number3
Publication statusPublished - 1 Mar 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Electronic structure, Ensemble optimization, Nonlinear conjugate gradient, Quasi-Newton method, Stiefel manifold

ID: 1590221