Photoinduced plasmon excitations in alkali-metal overlayers

Barman, Sudipto Roy; Horn, Karsten; Häberle, P.; Ishida, H.; Liebsch , A.

doi:10.1103/PhysRevB.57.6662

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Photoinduced plasmon excitations in alkali-metal overlayers

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Barman, Sudipto Roy
Fritz Haber Institute, Max Planck Society;

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Horn, Karsten
Surface Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Barman, S. R., Horn, K., Häberle, P., Ishida, H., & Liebsch, A. (1998). Photoinduced plasmon excitations in alkali-metal overlayers. Physical Review B, 57(11), 6662-6665. doi:10.1103/PhysRevB.57.6662.

Cite as: https://hdl.handle.net/21.11116/0000-0008-9D10-5

Abstract

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.