Dresden 2014 – wissenschaftliches Programm

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TUT: Tutorials

TUT 4: Tutorial: Festkörpercharakterisierung mit Positronen (MI)

TUT 4.2: Tutorium

Sonntag, 30. März 2014, 16:45–17:30, HSZ 201

Theoretical electron and electron-positron momentum densities of transition metals and their compounds in the presence of many-body correlation effects — •Liviu Chioncel — Theoretische Physik III, Zentrum für Elektronische Korrelationen und Magnetismus Institut für Physik Universität Augsburg — Augsburg Center for Innovative Technology

Valuable information about the nature of many-electron interactions in transition metals and their compounds is obtained from experiments based on Compton and positron annihilation spectroscopy the later especially in the form of angular correlation of annihilation radiation measurements. These experiments access the electron momentum density and the momentum density of annihilating electron-positron pairs. Here we review theoretical state of the art techniques that combine Density Functional and Dynamical Mean Field Theory which allows to calculate the electron momentum densities. We survey recent experiments and calculations for paramagnetic and ferromagnetic transition metals and half-metallic ferromagnets.