TY - JOUR
KW - paper
AU - R. Hambach
AU - Christine Giorgetti
AU - N. Hiraoka
AU - Y. Cai
AU - Francesco Sottile
AU - A-G Marinopoulos
AU - F. Bechstedt
AU - Lucia Reining
AB - 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,<math>\omega</math>). 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.
BT - Physical Review Letters
DO - 10.1103/PhysRevLett.101.266406
M1 - 26
N2 - 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,<math>\omega</math>). 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.
PB - APS
PY - 2008
EP - 266406
T2 - Physical Review Letters
TI - Anomalous Angular Dependence of the Dynamic Structure Factor near Bragg Reflections: Graphite
UR - http://link.aps.org/abstract/PRL/v101/e266406
VL - 101
ER -