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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Poster Tuesday: 2D Materials

O 39.7: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Study of the morphology and the Dirac-type band structure of 2D semi-conductor superlattices with honeycomb geometry — •Pierre Capiod, Tomas Meerwijk, Joep Peters, Christiaan Post, and Daniel Vanmaekelbergh — Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, Netherlands

2D systems with honeycomb geometry have attracted considerable interest in the last decade with unique electronic properties. Among them, the band structure of those type of materials exhibits a Dirac cone close the K-point. It would be of high interest to combine both Dirac-type band structure with the inherent semiconductor properties such as band gaps for electrical or optical switching.

The self-assembly of PbSe and CdSe semiconductor nanocrystal is possible via state-of-the-art chemistry techniques resulting in the square geometry or the wanted honeycomb geometry. Tight-binding calculations on the honeycomb geometry with CdSe nanocrystals have shown clear Dirac cones in the conduction bands and an opened Dirac cone in the valence band. The band structure exhibits as well non-trivial flat bands due to interactions between P-type orbitals.

The poster will show the results on the morphology and the characterization of the electronic properties obtained via Scanning Probe Microscopy (AFM & STM/STS). It will describe the steps from the synthesis, the preparation of the samples in UHV via annealing and ion bombardment to the characterization via LT-STM.

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