Accurate kinetic energy evaluation in electronic structure calculations with localised functions on real space grids

Details Accurate kinetic energy evaluation in electronic structure calculations with localised functions on real space grids Accurate kinetic energy evaluation in electronic structure calculations with localised functions on real space grids

2001-11-17

arxiv.org/abs/cond-mat/0111322v1

Comput. Phys. Commun. 140 (2001) 315-322

Physics

Condensed Matter

Materials Science

Standard Latex article format, 16 pages, 3 figures. Published in Computer Physics Communications vol.140 (2001) pp. 315-322

Scientific paper

10.1016/S0010-4655(01)00248-X

We present a method for calculating the kinetic energy of localised functions represented on a regular real space grid. This method uses fast Fourier transforms applied to restricted regions commensurate with the simulation cell and is applicable to grids of any symmetry. In the limit of large systems it scales linearly with system size. Comparison with the finite difference approach shows that our method offers significant improvements in accuracy without loss of efficiency.

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