Electron and Positron States in Layered Metal / Dielectric Nanostructures

Within the framework of modified Kohn-Sham method and stable jelly model with taking into account image forces and conduction band profiles of the dielectric, self-consistent calculations of potential profiles, the work functions and Schottky barriers for asymmetric metal-dielectric film systems, in which dielectrics on both sides of the metal nanofilms are different, were performed. Dielectric environment generally leads to negative changes in the electron work function and surface energy. In view of the dielectric conduction band (solid inert gases, SiO2), the size effects, the impact of effective mass on energy and annihilation characteristics of positrons in layered structures with self-consistent hybrid potential profiles built in the local density approximation and crosslinked with image potentials were investigated. The possibility of localization of a positronium atom in nanosandvich was discussed. Comparison with the experiments was done.