Model dielectric functions for fluctuation potential calculations in electron gas: A critical assessment

In this article, we report on a critical assessment of dielectric function calculations in electron gas through the comparison of different modeling methods. This work is motivated by the fact that the dielectric function is a key quantity in the multiple scattering description of plasmon features i...

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Bibliographic Details
Published in:Physical review. B 2022-05, Vol.105 (19), Article 195424
Main Authors: Mandal, Aditi, Tricot, Sylvain, Choubisa, Rakesh, Sébilleau, Didier
Format: Article
Language:English
Subjects:
Physics
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Summary:In this article, we report on a critical assessment of dielectric function calculations in electron gas through the comparison of different modeling methods. This work is motivated by the fact that the dielectric function is a key quantity in the multiple scattering description of plasmon features in various electron-based spectroscopies. Starting from the standard random phase approximation (RPA) expression, we move on to correlation-augmented RPA, then damped RPA models. Finally, we study the reconstruction of the dielectric function from its moments, using the Nevanlinna and memory function approaches. We find the memory function method to be the most effective, being highly flexible and customizable.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.105.195424