Set-up for high-resolved photoelectron diffraction with synchrotron radiation

该项目将用同步辐射记录角度分辨光电子能谱和光电子衍射图。实验数据将用于研究界面处的结构转变。具体来说，首先要研究的是一维相，即金属上半导体狄拉克材料的纳米带。随着项目的进展，将对相同系统的电子结构进行研究。然后，这些方法将被转移到其他系统。为此，硼在硅上的内部界面、功能纳米级杂化单元和咖啡因衍生物在金属上的官能团的初步研究工作是可用的。在所有系统中，重点是与电子性质有关的过渡结构。实验数据将在约10K的低温下记录，因为可以使用现有光束线的最大分辨率。此外，还提供了在低温条件下观察内部界面相变的实验可能性。第二个目标是进一步发展光电子全息术。在高动能电子能量下的初步工作表明，大约700个原子可以在正确的位置全息重建。在这个项目中，向低动能全息术的过渡将进一步推进。

The project will record angle-resolved photoelectron spectra and photoelectron diffractograms with synchrotron radiation. The experimental data will be used to investigate structural transitions at interfaces. Specifically, one-dimensional phases, so-called nano-ribbons of semiconducting Dirac materials on metals are to be investigated first. As the project progresses, the electronic structure of the same systems will be investigated. The methods will then be transferred to other systems. To this end, preliminary work on internal interfaces from boron on silicon, functional nanoscale hybrid units, and functional groups of caffeine derivatives on metals are available. In all systems, the focus is on the structure of the transition in connection with the electronic properties. The experimental data are to be recorded at low temperatures of about 10K, since the maximum resolution of the existing beamline can be used. In addition, the experimental possibility of observing phase transitions at internal interfaces at low temperatures is offered.The second goal is the further development of photoelectron holography. The preliminary work at high kinetic electron energies shows that approximately 700 atoms can be holographically reconstructed at the correct locations. The transition to holography at low kinetic energies will be further advanced in this project.