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In this paper we present an approach aimed at calculating the opticaldielectric constant of crystalline insulators both at the Hartree-Fock, andcorrelated levels. Our scheme employs a real-space methodology, employingWannier functions as the basic building blocks. The scheme has been applied tocompute the optical dielectric constants of LiF, LiCl, MgO, and Li2O. In allthe cases, results of correlated calculations, based upon systematic many-bodycorrections beyond Hartree-Fock, exhibit excellent agreement with theexperiments. To the best of our knowledge, the calculations presented here arethe first of their kind for bulk solids.Comment: 5 pages, to appear in Phys. Rev.

Ab initioreal-space Hartree-Fock and correlated approach to optical dielectric constants of crystalline insulators