Exact Exchange Scheme in the Parallel r-Space Implementation of the Kohn-Sham Realization of the Density Functional Theory

M. Marchwianya,b, M. Birowska a and J.A. Majewskia aFaculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warszawa, Poland bInterdisciplinary Centre for Mathematical and Computational Modelling (ICM), University of Warsaw, A. Pawińskiego 5a, 02-106 Warsaw, Poland

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In this communication, we present the r-space implementation of the Kohn-Sham realization of the density functional theory with the exact exchange functional within the computational algorithm for computers of parallel architecture. In comparison to the standard approach employing the local density functional, the scheme with exact exchange functional requires roughly ten times larger computational burden. The developed parallelization procedure accelerates the computations by a factor of four and six for the exact exchange and the local density functional schemes, respectively. It brings us closer to the treatment of dispersive van der Waals interactions on the fully ab initio level in the large class of systems.

DOI: 10.12693/APhysPolA.130.1236 PACS numbers: 31.15.E-, 31.15.-p, 61.50.Ah, 61.50.Lt, 71.15.Mb