SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster: Nanostructures at Surfaces

O 42.7: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Simulation of electronic transport in 2D networks — •Tim Güldenpfennig, Markus Gruschwitz, and Christoph Tegenkamp — Institut für Physik, TU Chemnitz, Reichenhainerstr. 70, 09126 Chemnitz

Interclation of atomic hydrogen into to the interface of buffer layer systems on SiC(0001) was shown to be powerful method to realize almost charge neutral quasi free monolayer graphene. This concept works also for intercalation of various metals (e.g. Pb, Sn, In) coming along with the formation of new 2D interface structures in proximity to graphene. However, defects within the buffer layer are often required for the intercalation of larger elements, thus the homogeneity of the intercalated areas depend strongly on the quality of the buffer layer and intercalation parameters. As a result, the quasi free monolayer graphene resembles a network structure rather than a homogeneous 2D phase.

In order to deduce the conductivity from our transport measurements done with a 4 point probe STM, we performed simulations. By means of COMSOL java api and the MPh library, the simulations were controlled via self-written python scripts. Next to the import of experimental data measured with high resolution SEM, own network structures were designed to study systematically the effect of anisotropy and inhomogeneities in 2D systems.