Theoretical analysis of the momentum-dependent loss function of bulk Ag
| Autor: | S.D. Schneider, Audrius Alkauskas, Cécile Hébert, Claudia Ambrosch-Draxl, Stephan Sagmeister |
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| Předmět: |
Plasmons
Silver Plasmon Dispersion Dispersion (optics) Time-dependent density functional theory Noble-Metals Electronic band structure Instrumentation Approximation Plasmon Momentum (technical analysis) Microscopy Inter-band transitions Local-field effects Chemistry Momentum transfer Electronic Excitations Momentum-dependence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Energy loss Density functional theory Atomic physics Random phase approximation |
| Popis: | We analyze the momentum-dependent loss function of bulk silver, calculated via the random-phase approximation and based on the band structure from semi-local density functional theory calculations. In the energy range of 0-55 eV the spectrum reveals the existence of seven well-pronounced peaks, in accordance with experiment. The two lowest of these are collective plasmon excitations, while the higher ones originate from inter-band transitions. Due to the different nature of those peaks, they display a different dependence on the momentum transfer q. While the plasmon peaks show an approximately quadratic q-dependence, the peaks caused by inter-band transitions are characterized by a much less pronounced dispersion. (C) 2009 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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