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

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

2010-04-29

arxiv.org/abs/1004.5205v1

Physical Review Letters 101, 26 (2008) http://prl.aps.org/abstract/PRL/v101/i26/e266406

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.101.266406

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,\omega). 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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