Doktorarbeiten

The quasi-one-dimensional van-der-Waals material α-Bi4Br4 crystallizes in a monoclinic crystal structure consisting of covalently bonded Bi4Br4 chains parallel to the lattice vector b. The van-der-Waals interaction connects these chains to form 2D layers. [...]

Low-energy electron microscopy (LEEM) is a versatile and powerful surface science tool for imaging, structural analysis and the study of kinetic surface processes such as molecular island growth, thin film growth and surface reconstruction. It uses electrons with kinetic energies below a few hundred electronvolts, often below 10 eV. [...]

A multi-tip scanning tunneling microscope (STM) is a great tool to investigate charge transport properties of nanostructured surfaces. This work focuses on the utilization of multi-tip STM implemented scanning tunneling potentiometry (STP) measurements, which allow for the simultaneous acquisition of topography and potential information of the sample under investigation. [...]

This work is dedicated to the detailed investigation of the atomic and magnetic structurein a selection of germanium-based melilite-type compounds, namely Ba2TGe2O7(T = Cu, Co and Mn) and the Ba2Cu1-xMnxGe2O7 solid solution series. These materialsgained high interest in the current condensed matter research as they revealed astrong magnetoelectric coupling that could not be explained by the conventional modelsof spin-driven multiferroicity. [...]

In the face of climate change and a growing global population, it's important to increase the output of agricultural systems and improve crop resilience to challenging environmental conditions. Achieving these objectives requires monitoring crop health in the field, as well as breeding more resilient crop varieties. [...]