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- W2022696619 abstract "We outline details about an extension of the tight-binding (TB) approach to improve total energies, forces, and transferability. The method is based on a second-order expansion of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations. The zeroth order approach is equivalent to a common standard non-self-consistent (TB) scheme, while at second order a transparent, parameter-free, and readily calculable expression for generalized Hamiltonian matrix elements may be derived. These are modified by a self-consistent redistribution of Mulliken charges (SCC). Besides the usual ``band structure'' and short-range repulsive terms the final approximate Kohn-Sham energy additionally includes a Coulomb interaction between charge fluctuations. At large distances this accounts for long-range electrostatic forces between two point charges and approximately includes self-interaction contributions of a given atom if the charges are located at one and the same atom. We apply the new SCC scheme to problems where deficiencies within the non-SCC standard TB approach become obvious. We thus considerably improve transferability." @default.
- W2022696619 created "2016-06-24" @default.
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- W2022696619 date "1998-09-15" @default.
- W2022696619 modified "2023-10-12" @default.
- W2022696619 title "Self-consistent-charge density-functional tight-binding method for simulations of complex materials properties" @default.
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- W2022696619 doi "https://doi.org/10.1103/physrevb.58.7260" @default.
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