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Theoretical x-ray spectroscopy *

Speaker: 
Claudia Draxl (Humboldt University of Berlin, Germany)
Date: 
Thu, 07/07/2016 - 2:00pm to 3:00pm
Location: 
CA2DM Theory Common (S16-06)
Host: 
Andrivo Rusydi and Vitor Pereira
Event Type: 
Seminars

a joint CA2DM/NUSNNI/SSLS seminar

Abstract

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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