Density-Polarization Functional Theory of the Response of a Periodic Insulating Solid to an Electric Field
Density-Polarization Functional Theory of the Response of a Periodic Insulating Solid to an Electric Field
The response of an infinite, periodic, insulating solid to an infinitesimally small electric field is investigated in the framework of density functional theory. We find that the applied perturbing potential is not a unique functional of the periodic density change; it depends also on the change in the macroscopic polarization. …