RT info:eu-repo/semantics/article
T1 Signatures of Short-Range Many-Body Effects in the Dielectric Function of Silicon for Finite Momentum Transfer
A1 Weissker, Hans-Christian
A1 Huotari, Simo
A1 Bruneval, Fabien
A1 Sottile, Francesco
A1 Monaco, Giulio
A1 Krisch, Michael
A1 Olevano, Valerio
A1 Reining, Lucia
A1 Serrano Gutiérrez, Jorge
AB We present an investigation of the dynamic structure factor and of the dielectric function εM(Q,ω) of the prototypical semiconductor silicon for finite momentum transfer, combining inelastic x-ray scattering experiments and ab initio calculations. In contrast with optical spectra, for finite momentum transfer time-dependent density-functional theory in the adiabatic local-density approximation together with lifetime broadening describes the physics of valence excitations correctly. Major structures in the spectra, governed by short-range crystal and exchange-correlation local-field effects, are strongly influenced by a mixing of transitions of positive and negative energies, in striking difference to spectra for vanishing momentum transfer. This mixing gives rise to a pronounced Fano asymmetry.
PB American Physical Society
SN 0031-9007
YR 2006
FD 2006
LK https://uvadoc.uva.es/handle/10324/65321
UL https://uvadoc.uva.es/handle/10324/65321
LA eng
NO Phys. Rev. Lett. 97, 237602 (2006)
DS UVaDOC
RD 30-jun-2024