Dynamical response function in sodium studied by inelastic x-ray scattering spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Dynamical response function in sodium studied by inelastic x-ray scattering spectroscopy

S. Huotani
  • Fonction : Auteur
M. Cazzaniga
  • Fonction : Auteur
T. Pykkanen
  • Fonction : Auteur
L. Reining
  • Fonction : Auteur
G. Onida
  • Fonction : Auteur
G. Monaco
  • Fonction : Auteur

Résumé

We present the dynamic structure factor S(Q, omega) of Na valence electrons in the range of momentum transfer 0.5k(F) < Q < 2.4k(F) and energy transfer 3 eV < omega < 30 eV determined by inelastic x-ray scattering spectroscopy. In this range, we observe how the collective plasmon excitations decay into the single-particle excitation continuum. We compare the results to calculations using time-dependent density-functional theory with different approximations. The failure of both random-phase approximation and time-dependent local-density approximation (TDLDA) is shown to become important at k(F) < Q < 2.4k(F), while TDLDA with an additional inclusion of quasiparticle lifetime effects reproduces the experimental spectra well. The experimental valence-electron response reaches the single-particle spectrum surprisingly early, at Q approximate to 1.5k(F). This is manifested both in the spectral shape and the peak dispersion. The experimental spectra are nearly free of any fine structure, confirming that the peak-shoulder structure observed in many other materials is due to band-structure effects, which turn out to be negligible in Na.
Fichier principal
Vignette du fichier
fulltext.pdf (537.39 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00696001 , version 1 (07-09-2023)

Identifiants

Citer

S. Huotani, M. Cazzaniga, H.-C. Weissker, T. Pykkanen, H. Muller, et al.. Dynamical response function in sodium studied by inelastic x-ray scattering spectroscopy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84, pp.075108. ⟨10.1103/PhysRevB.84.075108⟩. ⟨hal-00696001⟩
23 Consultations
4 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More