The activities of our department are centered around researchers having an expertise of their own. They are trained as theorists or experimentalists, as physicists or chemists. They are leading a group and follow their scientific interests independently. Together they form a team that carries out projects in a collaborative manner. They complement each other and share a common interest in various aspects of correlated materials. At present we have the following group leaders and research groups:
Spectroscopy is applied in a wide variety of scientific disciplines to explore matter's electronic structure. We employ synchrotron-based spectroscopic techniques such as Angle-Resolved PhotoEmission Spectroscopy (ARPES), Hard X-ray PhotoEmission Spectroscopy (HAXPES), Resonant X-ray Scattering (RXS), Non-resonant Inelastic X-ray Scattering (NIXS), and X-ray Absorption Spectroscopy (XAS).
Transition metal and rare-earth oxides, which show metal-insulator transition and interesting magnetic properties are in the focus of our research. Single crystalline oxide thin films are prepared by Molecular Beam Epitaxy (MBE) technique. We are also interested in MBE-grown topological insulator compounds, materials having a full insulating gap in the bulk, but topologically protected conducting surface. Our state-of-art in-house UHV equipment allows for in-situ structural characterization by RHEED and LEED, in-situ spectroscopic characterization and determination of the bulk and surface electronic structure by XPS/ARPES, in-situ temperature dependent resistivity measurements.
The study of exciting physical properties within the quantum mechanical world of condensed matter physics starts with the synthesis of high quality single crystals. Especially for polarization dependent soft-X-ray absorption (XAS), X-ray photoelectron spectroscopy (PES) and neutron scattering experiments sizeable single crystals are required. My lab is equipped with two high end floating zone mirror furnace systems with complementary growth conditions. Thus, we are able to synthesize materials also under extreme conditions.
For the study of the nuclear structure of our synthesized materials a state-of-the-art single crystal X-ray diffracometer is available in my lab. Beyond that, neutron experiments can be performed in spallation or reactor neutron sources (fission of Uranium) around the world. In contrast to X-rays, neutron scattering results from the nuclear interaction between neutrons and cores (and not from interaction with the electron shells) as well as the magnetic interaction of the neutrons magnetic moment with the moments of the atoms which gives rise to the observation of the spin structure as well as to the study of the intriguing spin excitation spectra within our systems.