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

Aditi Mandal, Sylvain Tricot, Rakesh Choubisa, and Didier Sébilleau
Phys. Rev. B 105, 195424 – Published 19 May 2022

Abstract

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.

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  • Received 21 January 2022
  • Revised 29 March 2022
  • Accepted 1 April 2022

DOI:https://doi.org/10.1103/PhysRevB.105.195424

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Aditi Mandal1,2, Sylvain Tricot2, Rakesh Choubisa1, and Didier Sébilleau2,*

  • 1Department of Physics, Birla Institute of Technology and Science–Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
  • 2Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France

  • *didier.sebilleau@univ-rennes1.fr

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Vol. 105, Iss. 19 — 15 May 2022

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