Education and Scientific Development

Education and Scientific Development

On this page you'll find a short review of my scientific development (last update: June 30th. 2000).

Scientific Development:

In September 1988 I began to study physics at the University of Rostock. I continued my studies at the University of Marburg ('89) and finished at the FU Berlin ('95).

My scientific career began with the Diploma thesis in the group of Prof. Kaindl at the Freie Universität Berlin (Germany). I was occupied with surface phenomena of lanthanide metals. On the one hand we considered the topics on the changed chemical environment of the surface atoms, i.e. the impact on the binding energies of 4f core electrons, additional surface states and a possible change of magnetic ordering temperatures. With the means of inverse photoemission (IPE) I mainly investigated the unoccupied electronic structure, but we also studied the occupied part of surface states with photoemission (PE). The prominent results of my diploma thesis are:

After passing the diploma exams I accepted the offer of an doctoral thesis in the group of Prof. Kaindl. Thereby we first intended to equip our IPE spectrometer with a spin-polarized electron gun. With that it would have been possible to clarify the (up to now) open questions regarding the magnetic behavior of the surface states on Gd and Tb. In the first year of my dissertation I (theoretically) constructed an transversal spin-polarized electron gun, having in the energy range from 10 to 150 eV a divergence of less than 1(!) degree. The drawing are finalized in my desk, but could not be realized because of financial reasons.
Thereupon we first realized surface-sensitive electron-excited x-ray emission measurements on elemental lanthanides in cooperation with Prof. A. S. Shulakov from St. Petersburg State University (Russia). With this usually bulk-sensitive method we could show that an experimental separation of the valence electronic structure of the surface atomic layer from the bulk one is possible.
The second main topic of my thesis arose due to a publication in Physical Review Letters in 1997. The authors claimed that the changed chemical environment of the La atoms in LaSe causes a binding energy shift of the unoccupied 4f1-level by more than 2.5 eV (closer to EF) with respect to pure La metal. In contrary with the help of IPE measurements we have now evidence that it is not the case in LaS, LaSe und LaTe. In fact we could qualitatively explain a step-like shift of the 4f-level each with about 0.15 eV from La to LaS over LaSe to LaTe.

The main results of my doctoral thesis are:

After defending my thesis I performed IPE on the Kondo peak in CeSi in collaboration with the group of Prof. Fink from Technical University of Dresden (Germany).

During my scientific work at the Freie Universität Berlin I also acquired the following knowledge’s:

My further scientific interests regarding the area of material science, as for instance thin magnetic layers, semiconductor metal contacts, .. . I think that the facilities of surface-sensitive x-ray emission and spin-polarized PE as well as scanning tunneling microscopy are still not exhausted. In these fields I am interested in both fundamental research and in applications into information techniques (MRAM, GMR-Heads, ..).

If you are interested in further information’s on me, please use the given contact possibilities on my homepage (
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