Correlation-Induced Double-Plasmon Excitation in Simple Metals Studied by Inelastic X-Ray Scattering

Research output: Contribution to journalArticle


  • Andrei Goussarov
  • C. Sternemann
  • S. Huotari
  • G. Vankó
  • M. Volmer
  • G. Monaco
  • H. Lustfeld
  • K. Sturm
  • W. Schülke

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We report a new type of peaklike structure observed in the tail of the dynamic structure factor of simple metals, measured by inelastic x-ray scattering. Based on the momentum-transfer dependence of the energy position and the intensity of this structure, it has been unambiguously attributed to intrinsic plasmon-plasmon excitations, an electronic correlation effect that was theoretically predicted by many-body perturbation theory of the homogeneous-electron-gas model beyond the random-phase approximation. This signature appears to be largely unaffected by electron-ion interaction effects. Thus a structure that is primarily caused by correlation effects in the electron gas has been found experimentally in the dynamic structure factor of simple metals.


Original languageEnglish
Pages (from-to)157401-4
JournalPhysical review Letters
Issue number15
Publication statusPublished - Oct 2005


  • inelastic x-ray scattering, electron gas, electronic correlation, plasmon-plasmon excitations

ID: 80304