PIER Photon Science Colloquium: Angular momentum resolved photoemission in one step: Recent developments in theory

by Hubert Ebert (Ludwig-Maximilians-Universität München)

Friday 14 Nov 2014, 14:00 → 15:00 Europe/Berlin

CFEL, Bldg. 99 (DESY Hamburg)

Various technical developments enlarged the potential of angle-resolved photoemission (ARPES) tremendously during the last one or two decades. In particular improved momentum, energy and spin resolution as well as the use of photon energies from few eV up to several keV makes ARPES a rather unique tool to investigate the electronic properties of solids and surfaces. Obviously, this rises the need for a corresponding theoretical formalism that allows to accompany experimental ARPES studies in an adequate way. As will be demonstrated this goal could be achieved by recent developments on the basis of the one-step model of photoemission: a fully relativistic description allows to deal with the spin-orbit induced Fano effect, the Rashba-splitting of Shockley-type surface as well as the properties of topological insulators in a rigorous way. The impact of chemical disorder within surface layers can be handled by means of the Coherent Potential Approximation (CPA) alloy theory. Calculating phonon properties together with the corresponding electron-phonon self-energy allows a direct comparison with features in the ARPES spectra caused by electron-phonon interaction. The same holds for the influence of electronic correlation effects.