Moiré-culous twists

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Title of the project: Three-dimensionally resolved measurements using 4D-STEM methods
Name of the VDSP student(s) & image credits: Clara Kofler
Project supervised by: Jani Kotakoski

 

About me/us: I am a PhD student in the group of Univ.-Prof. Jani Kotakoski and work on imaging bilayer graphene structures with scanning transmission electron microscopy (STEM), especially in regards to their three dimensional structure.

Image: This STEM-MAADF image shows two graphene layers twisted against each other with a varying angle. The formed moiré pattern depends on the twist angle, with larger twists corresponding to smaller moiré spots. The large, elongated moiré features on the upper left are attributed to very small, varying angles combined with lattice strain. The large 'islands' visible in the graphene lattice correspond to (mostly hydrocarbon) contamination.