Theoretical x-ray spectroscopy *
Affiliation: Humboldt University of Berlin, Germany
Abstract Details: Ab initio spectroscopy is a powerful combination of quantum-based theories and computer simulations. It covers a wide range of theoretical and computational methods, which go beyond density-functional theory by incorporating many-body effects and interactions that show up in the excited state. This methodology not only allows for analyzing data obtained by experimental probes like photoemission, optical absorption, Raman, infrared, x-ray, and electron-loss spectroscopy, but also for shining light onto the underlying processes. These may be distinctively different depending on the nature and dimensionality of the material. In this talk, I will focus on core excitations, discussing different absorption edges in a variety of systems. These will cover carbon-based materials, ranging from graphene to self-assembled monolayers of molecular switches and inorganic semiconductors, ranging from nitrides to wide-gap oxides. Discuss their exciton binding strength and character, I will show how theory can get insight into the exciting phenomena behind the spectral features.
About The Speaker: Prof. Claudia Draxl is Professor at the Humboldt-Universität zu Berlin and Felllow of the Max Planck Society. Her research is dedicated to condensed-matter theory and computational materials science, spanning theorectical concepts, development of computer codes, as well their application to a variety of materials. Her team is developing exciting - an all-electron full-potential computer package implementing DFT, TDDFT, and many-body perturbation theory. A particular focus is theoretical spectroscopy - the quantum-based description of radiation-matter interaction. Actual research projects concern organic/inorganic hybrid structures, molecular switches on surfaces, thermoelectricity, semiconductor nanostructures, solar-cell materials, organic film-growth, and more.
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