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Title:	Plasmonic excitations in quantum-sized sodium nanoparticles studied by time-dependent density functional calculations
Authors:	Li, J.-H.;Hayashi, M.;Guo, Guang Yu 郭光宇
Contributors:	應物所
Date:	2013-10
Issue Date:	2015-05-26 18:00:53 (UTC+8)
Abstract:	The plasmonic properties of spherelike bcc Na nanoclusters ranging from Na15 to Na331 have been studied by real-time time-dependent local density approximation calculations. The optical absorption spectrum, density response function, and static polarizability are evaluated. It is shown that the effect of the ionic background (ionic species and lattice) of the clusters accounts for the remaining discrepancy in the principal (surface plasmon) absorption peak energy between the experiments and previous calculations based on a jellium background model. The ionic background effect also pushes the critical cluster size where the maximum width of the principal peak occurs from Na40 predicted by the previous jellium model calculations to Na65. In the volume mode clusters (Na27, Na51, Na65, Na89, and Na113) in which the density response function is dominated by an intense volume mode, a multiple absorption peak structure also appears next to the principal peak. In contrast, the surface mode clusters of greater size (Na169, Na 229, Na283, and Na331) exhibit a smoother and narrower principal absorption peak because their surface plasmon energy is located well within that of the unperturbed electron-hole transitions, and their density responses already bear resemblance to that of classical Mie theory. Moreover, it is found that the volume plasmon that exists only in finite-size particles gives rise to the long absorption tail in the UV region. This volume plasmon manifests itself in the absorption spectrum even for clusters as large as Na331 with an effective diameter of ∼3.0 nm. © 2013 American Physical Society.
Relation:	Physical Review B - Condensed Matter and Materials Physics, 88(15), 論文編號 155437
Data Type:	article
DOI link:	http://dx.doi.org/10.1103/PhysRevB.88.155437
DOI:	10.1103/PhysRevB.88.155437
Appears in Collections:	[Graduate Institute of Applied Physics] Periodical Articles

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