Correlated electronic transitions at surfaces

N. Fominykh, J. Henk, J.Berakdar

A considerable amount of our knowledge of the electronic structure of surfaces is drawn from the spectra of a single particle emitted following electron or photon impact onto a surface sample.

In this project we aim at extending this spectroscopic tools to the emission of a correlated electron pair. The spectra of the pair carry useful information on the electronic correlation as well as on the electronic scattering mechanisms in the sample. In addition, it has been observed that the crystal structure leaves marked finger prints in the electron-pair spectra.
This project aims at developing realistic theoretical models for the description of the excitation and double-excitation spectrum of surfaces.

 The methods used rely on ab-initio schemes (layer KKR, LMTO, FPAPW,..) augmented by model calculations for the description of the electronic correlation.
 

Collaborations:

S. Samarin, J. Kirschner (MPI, Halle)
J. Feder, H. Gollisch (Diusburg)
G. Stefani (Rome)