Temperature-dependent two-dimensional plasmons at clean and hydrogenated Ge(001) surfaces

Citation
J. Eggeling et al., Temperature-dependent two-dimensional plasmons at clean and hydrogenated Ge(001) surfaces, PHYS REV B, 62(11), 2000, pp. 7330-7335
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
0163-1829 → ACNP
Volume
62
Issue
11
Year of publication
2000
Pages
7330 - 7335
Database
ISI
SICI code
0163-1829(20000915)62:11<7330:TTPACA>2.0.ZU;2-0
Abstract
High-resolution electron-energy-loss spectroscopy has been used to investig ate the behavior of the quasielastic peak in low-energy electron scattering from clean and hydrogen-covered Ge(001) surfaces. A marked dependence of t he quasielastic peak shape on both temperature and incident electron energy was found, and these peak shapes were successfully reproduced using dielec tric theory simulations. The simulations provide strong evidence for the ex istence of a thin metallic surface layer supporting two-dimensional plasmon s. The variation of peak shape with temperature arises from both changes in the Bose-Einstein spectrum of plasmon excitations and variation in the she et electron density with temperature. The temperature dependence of the she et electron density differs for the clean and hydrogen-covered surfaces.