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- W2020199564 abstract "We put forward new approach for the development of a non-local density functional by a direct modeling of the shape of exchange-correlation (xc) hole in inhomogeneous systems. The functional is aimed at giving an accurate xc-energy and an accurate corresponding xc-potential even in difficult near-degeneracy situations such as molecular bond breaking. In particular we demand that: (1) the xc hole properly contains -1 electron, (2) the xc-potential has the asymptotic -1/r behavior outside finite systems and (3) the xc-potential has the correct step structure related to the derivative discontinuities of the xc-energy functional. None of the currently existing functionals satisfies all these requirements. These demands are achieved by screening the exchange hole in such a way that the pair-correlation function is symmetric and satisfies the sum-rule. These two features immediately imply (1) and (2) while the explicit dependence of the exchange hole on the Kohn-Sham orbitals implies (3). Preliminary calculations show an improved physical description of the dissociating hydrogen molecule. Though the total energy is still far from perfect, the binding curve from our non-local density functional provides a significant improvement over the local density approximation." @default.
- W2020199564 created "2016-06-24" @default.
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- W2020199564 date "2013-02-27" @default.
- W2020199564 modified "2023-09-27" @default.
- W2020199564 title "Towards nonlocal density functionals by explicit modeling of the exchange-correlation hole in inhomogeneous systems" @default.
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- W2020199564 doi "https://doi.org/10.1103/physreva.87.022514" @default.
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