Doubly screened Coulomb correction approach for strongly correlated systems

Abstract

Strongly correlated systems containing d/f-electrons present a challenge to conventional density functional theory (DFT), such as the widely used local density approximation (LDA) or generalized gradient approximation (GGA). In this work, we developed a doubly screened Coulomb correction (DSCC) approach to perform on-site Coulomb interaction correction for strongly correlated materials. The on-site Coulomb interaction between localized d/f-electrons is determined from a model dielectric function that includes both the static dielectric and the Thomas-Fermi screening. All parameters of the dielectric model are efficiently obtained from self-consistent calculations. We applied DSCC to simulate the electronic and magnetic properties of typical 3d, 4f and 5f strongly correlated systems. The results show that the accuracy of DSCC is comparable to hybrid functionals, but an order of magnitude faster. In addition, DSCC can reflect the difference in the Coulomb interaction of the same element between metallic and insulating situations, similar to the popular but computationally expensive constrained random phase approximation (cRPA) approach. This feature suggests that DSCC is also a promising method for simulating Coulomb interaction parameters.

11 pages, 5 figures, 2 tables

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