From Excited Atoms to Functionality – ERC Advanced Grant Awarded to Alexander Föhlisch
Alexander Föhlisch is head of the HZB Institute Methods and Instrumentation for Synchrotron Radiation Research and holds a professorship at University Potsdam. © HZB
Under the EU Horizon 2020 Programme for Research and Innovation, Alexander Föhlisch has been awarded an ERC Advanced Grant. The physicists is holding a joint appointment at the Institute for Physics and Astronomy of the University of Potsdam and at the Helmholtz-Zentrum Berlin für Materialien und Energie. He is to receive a total of 2.5 million Euros over a five-year period to support his work on highly selective methods of detection using synchrotron light and X-ray lasers.
The European Research Council (ERC) promotes unconventional, trailblazing research and supports outstanding researchers. Leading scientists at the University of Potsdam are presently carrying out work under six other ERC grants.
The new research project is named “Excited-State Dynamics from Anti-Stokes and Non-Linear Resonant Inelastic X-Ray Scattering” (EDAX). Under this programme, Prof. Föhlisch will study how chemical reaction pathways and phase-transition behaviour can be probed using novel X-ray spectrographic methods. These will serve as a foundation for efficient energy conversion and future energy-efficient information technologies. The University of Potsdam is pushing ahead with cutting-edge research through the EDAX project and consolidating the rising success of the University in EU research programmes.
Alexander Föhlisch studied physics at Eberhard Karls Universität Tübingen and received his German Diplom degree from the University of Hamburg and Master’s degree in physics from the State University of New York at Stony Brook (SUNY). Prior to completing his research and teaching responsibilities for his professorial qualification in Experimental Physics at the University of Hamburg, he conducted his doctoral research at the Advanced Light Source of the Lawrence Berkeley National Laboratory and received his doctoral degree from Uppsala University in Sweden. As a jointly appointed Professor at the University of Potsdam and the Helmholtz-Zentrum Berlin, he is determining the electronic structure and ultrafast dynamics of atomic entities using innovative X-ray methods. Fundamental properties of materials – such as molecular dynamics at boundaries, switching processes in solids and chemical bonding at active centres – can be determined this way.
- BESSY II: New sample environment allows glimpse into thermocatalytic processesA novel measurement cell allows, for the first time, soft and hard X-ray investigations under high pressures of up to 20 bar and temperatures of up to 400°C. This provides new insights into thermocatalytic processes, such as the Fischer-Tropsch synthesis for producing synthetic fuels. The development of the measurement cell is considered a significant achievement within the Care-O-Sene project.
- Magnetic imaging: Micro-flowers increase the local magnetic fieldMaterials with magnetic nanostructures have many potential applications such as in spintronics. To explore such materials, nanoscale magnetic-sensitive imaging techniques are very useful, but up to now only weak magnetic fields could be applied during the imaging process. Now an international collaboration led by Dr. Sergio Valencia, HZB, has developed an approach that overcomes this limitation. The team designed tiny magnetic flux concentrators (MFCs), into which the sample is placed. The geometry of the MFCs resembles a flower with a number of petals which focus the applied magnetic field into its center. This greatly expands the magnetic field range available during imaging, and so the range of magnetic systems that can be investigated. The micro-flowers, enhancing magnetic fields locally, can find application in different nanometric magnetic microscopy techniques.
- Disorder creates new properties in compound semiconductorsAn international research team has demonstrated that the intrinsic disorder of the compound semiconductor CuInSnS₄ can be exploited to influence its optical properties. While the atomic vibrations also sense the local disorder, their response is averaged over many different local environments and therefore appear isotropic, as expected for a cubic crystal. In contrast, the optical excitations, known as excitons, are much more sensitive to the local arrangement of atoms. Surprisingly, they show a direction-dependent optical response even though the average crystal structure is cubic. These findings shed new light on the relationship between disorder and material properties, opening up new options for targeted 'disorder engineering' in optoelectronic and photocatalytic devices.