ELECTROSTATIC ENERGY AND LATTICE VIBRATIONS IN THIN IONIC SLABS

We have calculated the Electrostatic energy per cell for thin ionic slabs of any structure and any orientation, as a function of the position of the cell and the thickness of the slab. It is shown that a macroscopic depolarizing field is created inside the slabs of certain orientations. The Coulomb interaction between plane lattices is also calculated for the general case and the results are applied to GaAs