Low Temperature Physics: 42, 661 (2016); https://doi.org/10.1063/1.4960496
Физика Низких Температур: Том 42, Выпуск 8 (Август 2016), c. 841-853    ( к оглавлению , назад )

Electrostatic charge-charge and dipole-dipole interactions near the surface of a medium with screening non-locality (Review Article)

Alexander M. Gabovich and Alexander I. Voitenko

Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauka Ave., Kyiv 03680, Ukraine
E-mail: gabovich@iop.kiev.ua, voitenko@iop.kiev.ua

Received May 13, 2016


Interaction energy between two point charges, WQQ′, or two point dipoles, WPP′, located in a medium with a constant dielectric permittivity near the plane surface of a metallic or semiconducting substrate with the spatial dispersion of its dielectric function has been revisited. The calculations were made on the basis of the Green's function method for layered systems. Long-range lateral asymptotics were found. The non-local character of screening in the substrates was shown to substantially modify the dependences of WQQ′ and WPP′, on the distance between the objects concerned. Thus, the purported conventional electrostatic interactions between adsorbed atoms and molecules (modeled by point charges and point dipoles) should be reconsidered making allowance for the substrate polarization. In particular, this factor may significantly influence the structure of electrostatic dipole lattices arising near the surfaces of solids, as well as the kinetics of charge or dipole motion over the surface.

PACS: 73.20.–r Electron states at surfaces and interfaces;
PACS: 68.43.Fg Adsorbate structure (binding sites, geometry);
PACS: 71.10.Ca Electron gas, Fermi gas.

Key words: charge-charge interaction, dipole-dipole interaction, spatial dispersion of the dielectric permittivity, non-local electrostatics, Thomas–Fermi approximation.

Published online: June 24, 2016