Conventional and acoustic surface plasmons on noble metal surfaces: a time-dependent density functional theory study

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First-principles calculations of the conventional and acoustic surface plasmons (CSPs and ASPs) on the (111) surfaces of Cu, Ag, and Au are presented. The effect of s-d interband transitions on both types of plasmons is investigated by comparing results from the local density approximation and an orbital-dependent exchange-correlation (xc) potential that improves the position and width of the d bands. The plasmon dispersions calculated with the latter xc potential agree well with electron energy loss spectroscopy (EELS) experiments. For both the CSP and ASP, the same trend of Cu <Au <Ag is found for the plasmon energies and is attributed to the reduced screening by interband transitions from Cu, to Au and Ag. This trend for the ASP, however, contradicts a previous model prediction. While the ASP is seen as a weak feature in the EELS, it can be clearly identified in the static and dynamic dielectric band structure.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Issue number24
Pages (from-to)241404
Publication statusPublished - 2012

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©2012 American Physical Society

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