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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Institut für Physik

Antrittsvorlesung: Herr Prof. Dr. Christoph Koch (HU)

Vortrag zum Thema: "A 3D view of the world of atoms: Frontiers in Transmission Electron Microscopy"
Wann 01.12.2015 von 15:15 bis 17:00 (Europe/Berlin / UTC100) iCal
Wo Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal

Abstract: The mechanical, electrical, magnetic, and even optical properties of bulk materials and nanostructures depend on the 3-dimensional arrangement of atoms and charges within them. Modern transmission electron microscopy (TEM) makes it possible to see atomic arrangements in 3D, measure strain, electrostatic, and magnetic fields with sub-nm spatial resolution, and obtain spectroscopic information from individual atoms. After a short introduction of the technique and its capabilities I will first present our own recent work on pushing the limits of TEM in the area of mapping charge distributions and strain in semiconductor devices as well as eigenmodes of plasmonic nanostructures with sub-nm spatial resolution. I will also show how the theory of artificial neural networks helps us to invert the inevitable multiple scattering of the probing electrons and extract the three-dimensional arrangement of atoms it encodes.