2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156630The (001) surfaces of polar perovskites BaTiO$_3$ and PbTiO$_3$ have been studied from first principles at T=0 K. For both cases of polarization, the most stable TiO-terminated interfaces show intrinsic ferroelectricity. In the topmost layer, where the O atoms are $>$0.1 Åabove Ti, this leads to metallic instead of the insulating behavior of the electronic states that may have important implications for multiferroic tunneling junctions.5 Pages, 4 figures, accepted by PRBMaterials Sciencetext