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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: New Methods and Developments II: Scanning Probe, Spectroscopic, and Diffraction Techniques

O 10.9: Vortrag

Montag, 1. April 2019, 17:00–17:15, H3

Three-dimensional atomic image reconstruction by means of high kinetic energy electron holography — •Christopher Kohlmann1,2, Matthias Gianfelice1, Gert Nolze3, Lukas Kesper1,2, Richard Hönig1,2, and Carsten Westphal1,21Experimental Physics I - TU Dortmund University, Otto-Hahn-Str. 4a, D-44221 Dortmund — 2DELTA - TU Dortmund University, Maria Goeppert-Mayer-Str. 2, D-44221 Dortmund — 3BAM, Unter den Eichen 87, D-12205 Berlin

The determination of the atom locations in crystalline structures is of great importance for numerous systems and applications. Without a detailed knowledge of the atomic structure, the creation of synthetic systems with pre-determined properties, or the calculation of electronic properties would not be possible. For structures directly located at the surface, scanning-probe microscopy is an applicable method determining the surface structure.

One way to gain direct information about the three-dimensional structure in the subsurface region is the holographic approach as proposed by D. Gabor in 1948. The small wavelength of the electron wave is perfectly suited for imaging atoms. In the past electron holography was not as successful as imagined.

We present an electron holography method, which is able of three-dimensional atom image reconstruction with chemical sensitivity in the subsurface regime. Furthermore we will present new approaches of data processing for the experimental execution of this method.

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