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Density-functional tight-binding for beginners

Author: Pekka Koskinen, Ville Mäkinen
Url: http://arxiv.org/abs/0910.5861
Format: Ps,Pdf
Year: 2009
Category: Density Functional Theory
Pages: 22
Clicks: 3088

This article is a pedagogical introduction to density-functional tight-binding (DFTB) method. We derive it from the density-functional theory, give the details behind the tight-binding formalism, and give practical recipes for parametrization: how to calculate pseudo-atomic orbitals and matrix elements, and especially how to systematically fit the short-range repulsions. Our scope is neither to provide a historical review nor to make performance comparisons, but to give beginner\'s guide for this approximate, but in many ways invaluable, electronic structure simulation method--now freely available as an open-source software package, hotbit.

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