Ernst Eckhard Koch Prize and Innovation Award on Synchrotron Radiation
Dr Fredrik Johansson (Institut des NanoSciences de Paris, CNRS, Sorbonne) receives the Ernst Eckhard Koch Prize for his outstanding dissertation. © F.J.
The prize for innovation in synchrotron research went to Professor Marianne Liebi and Dr Manuel Guizar-Sicairos, both from the Paul Scherrer Institute (PSI), Switzerland. © PSI
This year, the Friends of HZB awarded the Ernst Eckhard Koch Prize to the outstanding doctoral thesis of Dr Fredrik Johansson (Institut des NanoSciences de Paris, CNRS, Sorbonne). The European Innovation Award on Synchrotron Radiation went to Professor Marianne Liebi and Dr Manuel Guizar-Sicairos, both from the Paul Scherrer Institute (PSI, Switzerland). The award ceremony took place at this year's HZB user meeting, which had to be held digitally again this year and attracted nearly 400 participants.
The chairman of the Friends of HZB, Professor Mathias Richter, guided the award ceremony on screen. Six high caliber nominations were up for selection this year for the Ernst Eckhard Koch Prize.
Ernst Eckhard Koch Prize 2021
The Ernst Eckhard Koch Prize went to Dr Fredrik Johansson (now Institut des NanoSciences de Paris, CNRS, Sorbonne) for his dissertation at Uppsala University on "Core-hole Clock Spectroscopy Using Hard X-rays - Exciting States in Condensed Matter".
"Overall an exceptional dissertation achievement" said the expert jury, highlighting the number of Johansson’s high-quality scientific publications. "Also impressive is the demonstration of orbital and directional selectivity in ultrafast charge transfer in SnS2 using core-hole-clock," the jury said. Johansson then presented the method in a clear and concise talk: it allows a precise measurement of charge transfer times in different solids and promises deeper insights into solar cells, for example.
Innovation Award on Synchrotron Radiation 2021
The Innovation Award on Synchrotron Radiation 2021 went to Professor Marianne Liebi and Dr Manuel Guizar-Sicairos, both from the Paul Scherrer Institute (PSI), Switzerland. They developed and implemented a method to obtain information about textures in materials on the nanoscale from small angle scattering data using mathematical methods (Small Angle Scattering Tensor Tomography). The expert jury emphasised that this method is now used at many synchrotron sources and has opened the door to fascinating studies of hierarchical structures in life and materials science. The laudation was given by Professor Gabriel Aeppli, Head of the Photon Science Division at PSI. The Innovation Award on Synchrotron Radiation is endowed with 3000 € and is sponsored by SPECS GmbH and BESTEC GmbH.
- 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.
- Superconducting TES array X-ray spectrometer goes into operation at BESSY IIEurope's first and only TES-spectrometer at a synchrotron source is now in operation at BESSY II, developed within a collaboration between the HZB, the MPI-CEC (Mühlheim-an-der-Ruhr, Germany) and the NIST (Boulder CO, USA). The photon detection efficiency of the new instrument exceeds that of wavelength-dispersive X-ray emission spectrometers by a factor of 100 to 1000. It will be used to investigate the electronic properties of atomically thin layers, nanostructures and highly diluted atomic and molecular samples. The team is looking forward to receiving exciting research proposals from the user community.