Regensburg 2004 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 12: Schichteigenschaften II

DS 12.1: Vortrag

Mittwoch, 10. März 2004, 15:15–15:30, HS 31

Ab-initio calculations of the optical properties of phase-change materials — •Manfred Niesert, Gustav Bihlmayer, and Stefan Blügel — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich

The results of ab-initio calculations of the dielectric function and the reflectivity of bulk GeTe and AgTe systems will be presented. These materials are promising candidates for memory devices exploiting the change of the optical properties depending on the structural phase-change and are thus subject of intensive investigations. Different atomic configurations have been computed and the influence on the dielectric function has been investigated. We focus on the degree of symmetry, comparing cubic with lower symmetry. The dielectric function considering the long-wavelength limit and neglecting local-field effects, is implemented within the FLEUR code, an implementation of the full-potential linearized augmented plane-wave (FLAPW) method.