Anomalous Angular Dependence of the Dynamic Structure Factor near Bragg Reflections: Graphite

R. Hambach, C. Giorgetti, N. Hiraoka, Y. Q. Cai, F. Sottile, A. G. Marinopoulos, F. Bechstedt, and Lucia Reining
Phys. Rev. Lett. 101, 266406 – Published 31 December 2008

Abstract

The electron energy-loss function of graphite is studied for momentum transfers q beyond the first Brillouin zone. We find that near Bragg reflections the spectra can change drastically for very small variations in q. The effect is investigated by means of first principle calculations in the random phase approximation and confirmed by inelastic x-ray scattering measurements of the dynamic structure factor S(q,ω). We demonstrate that this effect is governed by crystal local field effects and the stacking of graphite. It is traced back to a strong coupling between excitations at small and large momentum transfers.

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  • Received 8 February 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.266406

©2008 American Physical Society

Authors & Affiliations

R. Hambach1,2,3, C. Giorgetti1,2, N. Hiraoka4, Y. Q. Cai4,*, F. Sottile1,2, A. G. Marinopoulos5, F. Bechstedt3,2, and Lucia Reining1,2

  • 1Laboratoire des Solides Irradiés, Ecole Polytechnique, CEA/DSM, CNRS, 91128 Palaiseau, France
  • 2European Theoretical Spectroscopy Facility (ETSF)
  • 3Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
  • 4National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 5CEMDRX, Department of Physics, University of Coimbra, P-3004-516 Coimbra, Portugal

  • *Current address: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973.

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Issue

Vol. 101, Iss. 26 — 31 December 2008

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