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Empirical Functionals for Reduced Density Matrix Functional Theory

Authors: M.A.L. Marques and N.N. Lathiotakis

Ref.: Phys. Rev. A 77, 032509 (2008)

Abstract: We present fully empirical exchange-correlation functionals to be used within reduced density matrix functional theory (RDMFT). These are of the popular J-K form, where the function of the occupation numbers that multiplies the Fock orbital term is written as a Padé approximant. The coefficients of the Padé are optimized for a test set of eight molecules, and then refined for a larger set of 35 molecules. Two different approaches were tried, either keeping the self-interaction terms, or by removing them explicitly from the functional. The functionals thus obtained involve very few parameters, but are able to outperform other RDMFT functionals, yielding correlation energies that are, on average, even slightly better than Møller-Plesset MP2 theory.

DOI: 10.1103/PhysRevA.77.032509

URL: arxiv.org