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

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UNSPECIFIED (2000) Temperature-dependent two-dimensional plasmons at clean and hydrogenated Ge(001) surfaces. PHYSICAL REVIEW B, 62 (11). pp. 7330-7335. ISSN 1098-0121.

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Abstract

High-resolution electron-energy-loss spectroscopy has been used to investigate the behavior of the quasielastic peak in low-energy electron scattering from clean and hydrogen-covered Ge(001) surfaces. A marked dependence of the quasielastic peak shape on both temperature and incident electron energy was found, and these peak shapes were successfully reproduced using dielectric theory simulations. The simulations provide strong evidence for the existence of a thin metallic surface layer supporting two-dimensional plasmons. The variation of peak shape with temperature arises from both changes in the Bose-Einstein spectrum of plasmon excitations and variation in the sheet electron density with temperature. The temperature dependence of the sheet electron density differs for the clean and hydrogen-covered surfaces.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Journal or Publication Title: PHYSICAL REVIEW B
Publisher: AMERICAN PHYSICAL SOC
ISSN: 1098-0121
Official Date: 15 September 2000
Dates:
DateEvent
15 September 2000UNSPECIFIED
Volume: 62
Number: 11
Number of Pages: 6
Page Range: pp. 7330-7335
Publication Status: Published

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