Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.113002
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- SI2 [CHEM-1047772]
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It is observed that the exact interacting ground-state electronic energy of interest may be obtained directly, in principle, as a simple sum of orbital energies when a universal density-dependent term is added to w([rho];r), the familiar Hartree plus exchange-correlation component in the Kohn-Sham effective potential. The resultant shifted potential, (w) over bar ([rho]; r), actually changes less on average than (w) over bar([rho];r) when the density changes, including the fact that (w) over bar([rho];r) does not undergo a discontinuity when the number of electrons increases through an integer. Thus, the approximation of (w) over bar([rho];r) represents an alternative direct approach for the approximation of the ground-state energy and density.
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