Model dielectric functions for fluctuation potential calculations in electron gas: a critical assessment
| Autor: | Aditi Mandal, Sylvain Tricot, Rakesh Choubisa, Didier Sébilleau |
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| Přispěvatelé: | Birla Institute of Technology and Science (BITS Pilani), Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), A.M. is indebted to Rennes Métropole for providing her with two 6-month grants as a visiting scientist. |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Review B Physical Review B, 2022, 105 (19), pp.195424. ⟨10.1103/PhysRevB.105.195424⟩ |
| ISSN: | 2469-9950 2469-9969 |
| DOI: | 10.1103/PhysRevB.105.195424⟩ |
| Popis: | In this article, we report a critical assessment of dielectric function calculations in electron gas through the comparison of different modelling 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. 14 pages, 9 figures |
| Databáze: | OpenAIRE |
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