Observation of new quantum interference effect in solids

The experiments and theoretical basis for reducing the work function of Au and SiO/sub 2/ thin films are discussed. In order to achieve the quantum interference of free electrons, the geometry of the solid is modified so that the de Broglie waves interfere destructively inside the solid. If a metal surface is modified with patterned indents, the Fermi energy increases and consequently the electron work function decreases. This effect is named the Avto effect. Work function reductions of 0.5 eV and 0.2 eV are observed in Au and SiO/sub 2/ films, respectively. Comparative measurements of work function are made using the Kelvin probe method based on the compensation of internal contact potential difference. Electron emission from the same thin films are also studied using photoelectron emission microscopy.