Photoinduced plasmon excitations in alkali-metal overlayers

Barman S.R.; Horn, K; Haberle, P.; Ishida, H; Liebsch, A


Collective surface excitations in alkali-metal overlayers are observed using photoyield spectroscopy. Spectra for Na and K on Al(111) reveal a multipole surface plasmon and bulklike overlayer plasmon. In contrast, Li on Al exhibits only the multipole mode. In the submonolayer regime, all three alkali metals provide evidence for the threshold excitation. Time-dependent density-functional calculations for realistic alkali-metal overlayers agree well with these observations.

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Título de la Revista: PHYSICAL REVIEW B
Volumen: 57
Número: 11
Editorial: American Physical Society
Fecha de publicación: 1998
Página de inicio: 6662
Página final: 6665