Vakula P. The energy states of electrons and positrons in vacancies metals and layered nanostructures

It is shown that for the metals in which the vacuum work function of the positron is negative, the presence of a dielectric coating leads to a change in the sign of the work function. The vacancy formation energy, and the vacancy contribution to the electrical conductivity self-consistently are calculated. Using calculated phase shifts and superlattice approximation for vacancy subsystem in the metal, the vacancy contribution to the electron work function and effective mass have been estimated at first time. Positron work function, binding en-ergy, and lifetime have been calculated self-consistently also. On the basis of calculated phase shifts of quasi-free positron, the vacancy term to the positron work function and effective mass have been estimated at first time. Size effects, role of the electron and positron effective masses in the energy and annihilation characteristics of systems with double potential wells caused imaging potential have been calculated. The ability of the metal-dielectric nanosandwiches to the condensation of positronium atoms are demostrated.