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

Abstract

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.

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

Cited by in corpus (4)

• O(N) methods in electronic structure calculations
• Accurate ionic forces and geometry optimisation in linear scaling density-functional theory with local orbitals
• Using ONETEP for accurate and efficient O(N) density functional calculations
• Comparison of variational real-space representations of the kinetic energy operator