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Collectivity in the optical response of small metal clusters | | S. Kümmel
; K.Andrae
; P.-G. Reinhard
; | | Date: |
30 Aug 2001 | | Journal: | Appl. Phys. B 73, 293 (2001) | | Subject: | Atomic and Molecular Clusters; Chemical Physics; Materials Science | physics.atm-clus cond-mat.mtrl-sci physics.chem-ph | | Abstract: | The question whether the linear absorption spectra of metal clusters can be interpreted as density oscillations (collective ``plasmons’’) or can only be understood as transitions between distinct molecular states is still a matter of debate for clusters with only a few electrons. We calculate the photoabsorption spectra of Na2 and Na5+ comparing two different methods: quantum fluid-dynamics and time-dependent density functional theory. The changes in the electronic structure associated with particular excitations are visualized in ``snapshots’’ via transition densities. Our analysis shows that even for the smallest clusters, the observed excitations can be interpreted as intuitively understandable density oscillations. For Na5+, the importance of self-interaction corrections to the adiabatic local density approximation is demonstrated. | | Source: | arXiv, physics/0108071 | | Services: | Forum | Review | PDF | Favorites | |
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