Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Focussed Session: Frontiers of Electronic Structure Theory II (jointly with HL and TT)
O 17.3: Talk
Monday, March 11, 2013, 16:30–16:45, H36
First-principles IXS spectra for TiO2 and HfO2 — •Linda Hung and Francesco Sottile — Ecole Polytechnique, Palaiseau, France
Using time-dependent DFT and many-body perturbation theory, we determine the inelastic x-ray scattering (IXS) spectra for bulk TiO2 and HfO2. Excitations from valence and semi-core states are modeled, corresponding to transition energies up to 60 eV. By varying momentum transfer, plasmon dispersion can be observed. We characterize differences in the spectra for the rutile, anatase, and brookite polymorphs of TiO2, as well as the cubic, tetragonal, and orthogonal polymorphs of HfO2. These spectra are also Fourier transformed, allowing us to image the real-time and real-space electron density response to external perturbations.