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MM: Fachverband Metall- und Materialphysik
MM 37: Development of Calculation Methods I
MM 37.4: Vortrag
Donnerstag, 12. März 2026, 16:30–16:45, SCH/A315
Bulk plasmons in elemental metals — •Claudia Cardoso1, Dario Leon2, and Kristian Berland2 — 1S3 Centre, Istituto Nanoscienze, CNR, 41125 Modena, Italy — 2Department of Mechanical Engineering and Technology Management,
Norwegian University of Life Sciences, NO-1432 Ås, Norway
We have developed an effective analytical representation of the main collective excitations of the dielectric response of 26 elemental metals, starting from first principles calculations. Spectral band structures are then constructed , by extending our earlier model based on multipole-Padé approximants (MPA) [1,2] to incorporate both momentum and frequency dependence (MPA(q)). With this representation, we are able to identify plasmonic quasiparticle dispersions exhibiting complex features, including non-parabolic energy and intensity dispersions, discontinuities due to anisotropy, and overlapping effects that lead to band crossings and anti-crossings. We find good agreement with available experimental data. The results for elemental metals and their effective MPA(q) representation establish a reference point that can guide both fundamental studies and practical applications in plasmonics and spectroscopy.
[1] D. A. Leon, C. Cardoso, T. Chiarotti, D. Varsano, Phys. Rev. B 104, 115157 (2021).
[2] D. A. Leon, A. Ferretti, D. Varsano, E. Molinari, and C. Cardoso, Phys. Rev. B 107, 155130 (2023).
Keywords: Dielectric properties; Electronic structure; Plasmons; First-principles calculations; Random phase approximation