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Paper detail

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

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.

preprint2010arXivOpen access
R. HambachC. GiorgettiN. HiraokaY. Q. CaiF. SottileA. G. MarinopoulosF. BechstedtLucia Reining
cond-mat.mtrl-sci
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R. HambachC. GiorgettiN. HiraokaY. Q. CaiF. SottileA. G. MarinopoulosF. BechstedtLucia Reining

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