In:
physica status solidi (b), Wiley, Vol. 247, No. 8 ( 2010-08), p. 1849-1857
Abstract:
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 self‐consistent 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.
Type of Medium:
Online Resource
ISSN:
0370-1972
,
1521-3951
DOI:
10.1002/pssb.200983843
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
208851-4
detail.hit.zdb_id:
1481096-7
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