Dynamical screening in SrVO3 : Inelastic x-ray scattering experiments and ab initio calculations

Abstract

We characterize experimentally and theoretically the high-energy dielectric screening properties of the prototypical correlated metal SrVO 3 . The dynamical structure factor measured by inelastic x-ray scattering spectroscopy as a function of momentum transfer is in very good agreement with first-principles calculations in the adiabatic local-density approximation to time-dependent density-functional theory. Our results reveal the crucial importance of crystal local fields in the charge response function of correlated materials: They lead to depolarization effects for localized excitations and couple spectra from different Brillouin zones.

Non-resonant inelastic X-ray scattering for discrimination of pigments

“…The same behaviour was reported for many materials, including silicon 28 or SrVO 3 . 29 IXS relies on the energy and momentum transfers measured from a high-energy incident photon in the X-ray range that is defined by its wave vector, energy, and polarisation ( k 1 , ħω 1 , ε 1 ) by the electron system and the scattered photon ( k 2 , ħω 2 , ε 2 ) defined by the same parameters. 30,31 The measured energy transfer ħω is given by the law of conservation of energy, ħω = ħω 1 − ħω 2 and momentum transfer q is a function of the scattering angle.…”

Self-similarity of spectral response functions for fractional quantum Hall states

“…This leaves scope for further manifestations of self-similarity due to this recurrence relation, as well as potential applications. For example, there is a natural limitation to the achievable energy resolution of structure factors derived from experiments, such as inelastic X-ray scattering and photoemission spectroscopies [52,53], which may be numerically enhanced using statistical interpolation. Moreover, dynamical quantum simulators have recently been proposed as a method to compute structure factors [54,55], which may be expedited using self-similarity relations.…”