Dynamical properties and Wigner transitions of two-dimensional electron lattices on dielectric substrates

Scientific paper - Original scientific paper

• Author: Z. Lenac
• 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)

The dynamical properties (phonon spectrum, sound velocities, vibrational energy) and phase transitions of a two-dimensional Wigner lattice are discussed in a model that takes into account the perpendicular delocalization of electron wave functions. The lattice floats above the dielectric substrate (He,Ar), with the dielectric constant determining the image force on the lattice. Those two effects, the perpendicular electron delocalization and the dielectric image force, which are obviously correlated, were usually neglected in the previous discussions of the Wigner-lattice dynamics. Here we show their influence on the electron-electron interaction and consequently on the dynamical properties of the Wigner lattice. We also suggest an experimental situation where those effects in the phase diagram could be eventually studied and detected.

• 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)
• Numbering: vol. 44, no. 20, pp. 11465-11471
• p-ISSN: 0163-1829
• DOI: https://doi.org/10.1103/PhysRevB.44.11465
• URN:NBN: urn:nbn:hr:217:495313
• Publication: 1991
• Document URL: http://link.aps.org/doi/10.1103/PhysRevB.44.11465
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (1991) by the American Physical Society.
• Created on: 2019-10-01 20:18:10