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

J. A. Gaspar*, A. G. Eguiluz, K. D. Tsuei, E. W. Plummer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

The spectrum of electronic excitations of Na and K 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.

Original languageEnglish
Pages (from-to)2854-2857
Number of pages4
JournalPhysical Review Letters
Volume67
Issue number20
DOIs
StatePublished - 1991
Externally publishedYes

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