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

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.

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