• Glassy Dynamics Priv.-Doz. Dr. Peter Lunkenheimer (Experimentalphysik V)
    This project focuses on the investigation of the molecular dynamics at the liquid-glass transition using broadband dielectric spectroscopy. One finds a variety of dynamic processes, whose origin often is not clarified yet. They also are of technical relevance, e.g., for the application of polymers in modern communication technique. The characterization of these processes, especially in the so far only rarely investigated high-frequency range, and the clarification of their microscopic origins are the aim of this project. In addition, we investigate the technically highly relevant aging processes of glasses, which from a theoretical point of view so far are only poorly understood.

  • DFG Graduiertenkolleg 283 U. Eckern K. Ziegler ()
    The following topics are studied: interacting electrons in low dimensional systems, strong correlations (Bethe ansatz and Monte Carlo methods), ground state and response properties (especially in one and two dimensions), phase coherence and quantum fluctuations in networks of Josephson junctions and other mesoscopic systems, metal-insulator and superconductor-insulator transitions

  • DFG Forschergruppe 241 U. Eckern K.-H. Höck P. Schwab ()
    The work performed within the DFG Research Group centers about the electronic, magnetic and elastic properties of highly correlated transition metal chalcogenides. In particular, we concentrate on oxides and sulfides of the early transition metals like vanadium and chromium. Some of these compounds display a metal-insulator transition as a function of temperature or external pressure as well as exciting magnetic properties. In addition, doping e.g. with sodium or strontium allows for specific tailoring of the electronic and magnetic properties. Although all these phenomena open lay ground for very promising -- industrial -- applications, our present understanding of the driving force for the metal-insulator transition is still limited. This background marked the starting point of our activities: In close collaboration of experimentalists and theoreticians we are investigating the role of electron-electron correlations as well as of electron-lattice interaction.