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MM: Metall- und Materialphysik
MM 19: Electronic Properties I
MM 19.1: Talk
Tuesday, March 28, 2006, 16:30–16:45, IFW B
Correlation-induced double-plasmon excitations in simple metals studied by inelastic x-ray scattering — •C. Sternemann1, S. Huotari2, G. Vankó2, M. Volmer1, H. Sternemann1, G. Monaco2, A. Gusarov3,4, H. Lustfeld3, K. Sturm3, M. Tolan1, and W. Schülke1 — 1Institute of Physics / DELTA, University of Dortmund, D-44221 Dortmund, Germany — 2European Synchrotron Radiation Facility, BP 220,*F-38043 Grenoble Cedex, France — 3Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 4SCK · CEN, Belgium Nuclear Research Centre,*Boeretang 200, B-2400 Mol, Belgium
Peaklike structures in the high energy-loss tail of the dynamic structure factor of simple metals were predicted by many-body perturbation theory of the homogeneous electron gas beyond the random-phase approximation [1]. Such structures were experimentally observed in the dynamic structure factor of Aluminium and, based on a comparison with the calculations, were attributed to intrinsic double-plasmon excitations because of the distinct momentum transfer dependence of their energy position and intensity [2]. A systematic inelastic x-ray scattering study of this kind of excitations for different materials as a function of electron density was accomplished recently at beamline ID16 of the European Synchrotron Radiation Facility. The measured spectra of the intrinsic plasmon-plasmon excitations will be discussed and compared with corresponding calculations.
[1] K. Sturm and A. Gusarov, Phys. Rev. B 62, 16474, (2000).
[2] C. Sternemann et al., Phys. Rev. Lett. 95, 157401, (2005).