Abstract
We propose the term “weak polarity” to characterize the electrostatic properties of some ternary (or more complex) insulating compound slabs, which are not fully ionic and in which covalency (i.e. anion-cation electron sharing) is responsible for the presence of a non-vanishing macroscopic dipole moment perpendicular to the surface. We exemplify this situation by the SrTiO 3(001) surface, which we study by means of a semi-empirical Hartree-Fock approach. The bond-breaking processes at the surface are shown to yield the charge redistribution required for the cancellation of the macroscopic electrostatic field. There is no need for strong modifications of the electronic structure such as the surface metallization predicted on the polar stoichiometric MgO(111) surface.
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