Nonlocality of Kohn-Sham exchange-correlation fields in dielectrics

Details Nonlocality of Kohn-Sham exchange-correlation fields in dielectrics Nonlocality of Kohn-Sham exchange-correlation fields in dielectrics

1997-05-25

arxiv.org/abs/cond-mat/9705253v1

Physics

Condensed Matter

Materials Science

4 pages, two-column style with 2 postscript figures embedded. Uses REVTEX and epsf macros. Also available at http://www.phys

Scientific paper

10.1103/PhysRevLett.79.3966

The theory of the macroscopic field appearing in the Kohn-Sham exchange-correlation potential for dielectric materials, as introduced by Gonze, Ghosez and Godby, is reexamined. It is shown that this Kohn-Sham field cannot be determined from a knowledge of the local state of the material (local crystal potential, electric field, and polarization) alone. Instead, it has an intrinsically nonlocal dependence on the global electrostatic configuration. For example, it vanishes in simple transverse configurations of a polarized dielectric, but not in longitudinal ones.

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