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9 Theoretical Background

The following sections contain some background information on the algorithms used in VASP. They do not contain a complete reference to all the things implemented in VASP but try to give hints on the most important topics. You should really understand at least the ideas touched here -- but it might be still possible to get good results without understanding all of it.

For a basic outline of pseudopotential plane wave programs we refer to [4, 5]. Ultrasoft pseudopotentials are explained in [6, 7, 8, 16]. An excellent introduction to PP plane wave codes - albeit in German - can be found in the thesis of J. Furthmüller [9]. The best explanation of the algorithms found in VASP can be found in Ref. [11, 12], these two papers give much more information than can be found in the following sections. And last but not least, you want might read the thesis of G. Kresse [10] (in German too) -- it contains a general discussion of PP including ultrasoft PP, and a discussion of the KS-functional and algorithms to calculate the KS-groundstate.

Mon Mar 29 10:38:29 MEST 1999