Optimized Effective Potentials in Finite Basis Sets

Details Optimized Effective Potentials in Finite Basis Sets Optimized Effective Potentials in Finite Basis Sets

2006-10-31

arxiv.org/abs/cond-mat/0610884v3

Phys. Rev. Lett. 98, 256401(2007)

Physics

Condensed Matter

Materials Science

23 pages, 28 figures

Scientific paper

10.1103/PhysRevLett.98.256401

The finite basis optimized effective potential (OEP) method within density functional theory is examined as an ill-posed problem. It is shown that the generation of nonphysical potentials is a controllable manifestation of the use of unbalanced, and thus unsuitable, basis sets. A modified functional incorporating a regularizing smoothness measure of the OEP is introduced. This provides a condition on balanced basis sets for the potential, as well as a method to determine the most appropriate OEP potential and energy from calculations performed with any finite basis set.

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