Novel topological phases at interfaces and in superlattices
TRANSITION METAL DICHALCOGENIDES
Mapping electronic structure of atomically thin 2D materials
MAGNETIC THIN FILMS
Ferromagnetism and spin-orbit coupling in 3d and 4f systems
High resolution angle-resolved photoemission spectroscopy with the added spin-sensitivity (spin-ARPES) is the technique of choice to probe the electronic structure of crystalline solids. Driven by the interest in understanding the magnetic properties of surface electrons, we map band dispersions and Fermi surfaces of epitaxial thin films and novel materials such as topological insulators.
In Jülich we operate the lab-based laser spin-ARPES system that combines high intensity continuous wave 6 eV laser with cryogenic cooling to provide overall energy resolution below 3 meV in spin-intergrated and below 10 meV in spin-resolved mode. The system is also equipped with He and Xe discharge sources. The MBS A-1 hemispherical analyzer has a lens deflector that allows mapping of the Brillouin zone without rotating the sample.
Our photoemission experiments have been performed in the lab in Jülich and at various synchrotron beamlines around the globe, such as Elettra (Italy), ALS (USA), or Soleil (France).