Delocalized Wigner lattice on a dielectric layer with a metallic substrate: Dynamical properties and phase transitions

Scientific paper - Original scientific paper

• Author: Z. Lenac; MBZ: 25722
• Author: Marijan Šunjić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Properties of a two-dimensional Wigner lattice are analyzed taking into account delocalization of electrons on a thin dielectric layer with a metallic substrate. Electronic screening arising from the metallic substrate enhances the image potential as compared to the semi-infinite dielectric layer, but at the same time lowers the electron-electron interaction. As a result, the electron delocalization becomes a complicated function of the dielectric thickness, dielectric constant, and the electron density. The electron ground-state energy is calculated including the k=0 term of the lattice potential, which has a significant effect at high electron densities. The influence of electron delocalization and of the dielectric substrate on the electron lattice dynamics (phonon spectra, sound velocities) and on the Wigner phase transition is demonstrated. In particular, possible extension of the Kosterlitz-Thouless melting criterion to the quantum regime is discussed.

• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical review B: Condensed matter and materials physics
• Numbering: vol. 46, no. 12, pp. 7821-7828
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.46.7821
• URN:NBN: urn:nbn:hr:217:608874
• Publication: 1992
• Document URL: http://link.aps.org/doi/10.1103/PhysRevB.46.7821
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (1992) by the American Physical Society.
• Created on: 2019-10-02 19:30:23