Explicit approximations for the charge density of inhomogeneous materials are constructed as functionals of the Kohn-Sham potential using the Lindhard response of the homogeneous electron gas, with accuracy improving on cubic helium as the level of approximation increases.
Moreover, the density is always positive, as opposed to Fig
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Designing explicit functionals for the charge density in terms of a potential
Explicit approximations for the charge density of inhomogeneous materials are constructed as functionals of the Kohn-Sham potential using the Lindhard response of the homogeneous electron gas, with accuracy improving on cubic helium as the level of approximation increases.