Elementary excitations in alkali-metal overlayers probed by electron-energy-loss spectroscopy : quantum-mechanical effects

The spectrum of electronic excitations of Na and potassium overlayers adsorbed on Al(111) has been studied by means of electron-energy-loss-spectroscopy experiments, and self-consistent, dynamical-response calculations. Losses are observed in two distinct energy and coverage domains. The loss observ...

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Bibliographic Details
Published in:Physical review letters 1991-11, Vol.67 (20), p.2854-2857
Main Authors: GASPAR, J. A, EGUILUZ, A. G, TSUEI, K.-D, PLUMMER, E. W
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Metals. Metallurgy
Physics
Surface and interface electron states
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Summary:The spectrum of electronic excitations of Na and potassium overlayers adsorbed on Al(111) has been studied by means of electron-energy-loss-spectroscopy experiments, and self-consistent, dynamical-response calculations. Losses are observed in two distinct energy and coverage domains. The loss observed during the formation of the second atomic layer shows novel features, which are traced to the intrinsic quantum-mechanical nature of the excitations being probed, and their spatial confinement by the overlayer.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.67.2854