Sternemann C, Huotari S, Vankó G, Volmer M, Monaco G, Gusarov A, Lustfeld H, Sturm K, Schülke W. Correlation-induced double-plasmon excitation in simple metals studied by inelastic x-ray scattering.
PHYSICAL REVIEW LETTERS 2005;
95:157401. [PMID:
16241758 DOI:
10.1103/physrevlett.95.157401]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Indexed: 05/05/2023]
Abstract
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.
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