Dynamic Stability of Submonolayer Structures in the Li/Cu(111) System

The equilibrium crystal structure and vibrational properties of the Li/Cu(111) system have been calculated theoretically using the interatomic potentials obtained within the embedded atom method. The submonolayer p , p , and structures formed at degrees of lithium adsorption from 0.11 to 0.33 monola...

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Bibliographic Details
Published in:JETP letters 2022-08, Vol.116 (4), p.261-267
Main Authors: Rusina, G. G., Borisova, S. D., Chulkov, E. V.
Format: Article
Language:English
Subjects:
Adatoms
Adsorption
Alkali metals
Atomic
Bilayers
Biological and Medical Physics
Biophysics
Condensed Matter
Crystal structure
Dynamic stability
Embedded atom method
Lithium
Mathematical analysis
Molecular
Monolayers
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
Structural stability
Substrates
Surface chemistry
Vibrational states
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Summary:The equilibrium crystal structure and vibrational properties of the Li/Cu(111) system have been calculated theoretically using the interatomic potentials obtained within the embedded atom method. The submonolayer p , p , and structures formed at degrees of lithium adsorption from 0.11 to 0.33 monolayer and bilayer (2 × 2)-3Li structure have been considered. Surface relaxation data, phonon spectra, and the local distribution density of vibrational states on the adatoms and atoms of the substrate are presented. The calculations have shown that an increase in the degree of submonolayer adsorption of lithium on the Cu(111) surface results in the dependence of the energy of low-frequency longitudinal vibrations of adatoms that is atypical of alkali metals. The energy of such vibrations decreases in the range from 0.11 to 0.56 monolayer down to imaginary values in the saturated monolayer coating. A further increase in the degree of adsorption to 0.75 monolayer leads to the formation of the dynamically stable Cu(111)-(2 × 2)-3Li structure with the strong hybridization of all types of vibrations of Li atoms and the substrate.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364022601439