Collective excitations of thin films of disordered potassium adsorbed on Ag(110)

Moresco, Francesca; Rocca, M.; Hildebrandt, T.; Henzler, M.

doi:10.1016/s0039-6028(99)00012-6

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…The study of electronic excitations in thin adsorbed alkali metal layers was an active topic for more than four decades 1–23. These systems are of interest because they show variety of phenomena such as work function changes, metal‐insulator transitions, and surface reconstruction.…”

Section: Introductionmentioning

confidence: 99%

Modification of response properties of the Be(0001) surface upon adsorption of a potassium monolayer: An ab initio calculation

Silkin

Chulkov

Echeverry

et al. 2010

Physica Status Solidi (b)

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Collective electronic excitations associated with a potassium monolayer (1 ML) on a Be(0001) substrate are studied using ab initio evaluations of the surface response function with the use of energies and wave functions obtained from the selfconsistent pseudopotential calculations. The plasmon dispersion relations as well as real and imaginary parts of the dynamical induced charge density oscillations are presented. Comparison of the collective modes of the 1 ML K/Be(0001) system with that of a clean Be(0001) surface is given. It is shown that the K monolayer adsorption leads to appearance, additionally to the conventional surface plasmon of a clean Be surface, of a low-energy mode with characteristic acoustic-like dispersion in the 0-2 eV energy range. The existence of this mode owes to the presence of a K-induced quantum-well-state band whose wave function is strongly localized in the K adlayer. Also we observe a K-derived multipole plasmon with energy around 3 eV. Some other modifications in the Be surface plasmon properties upon K adsorption are discussed as well. 1 Introduction The study of electronic excitations in thin adsorbed alkali metal layers was an active topic for more than four decades . These systems are of interest because they show variety of phenomena such as work function changes, metal-insulator transitions, and surface reconstruction. In particular, they allow to investigate in great details the evolution of various basic physical properties of metal surfaces by changing the alkali adatom coverage. Thus the change in the screening properties (in particular, the strong non-locality of the screened interaction) at the surfaces in general [24]

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Section: Introductionmentioning

confidence: 99%