Dresden 2020 – wissenschaftliches Programm
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DS 29.3: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Spatially resolved Raman spectroscopy of twisted bilayer graphene — •Aaron Johannes Schäpers1, Robin Joey Dolleman1, and Christoph Stampfer1,2 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany
Twisted bilayer graphene (tBLG) is attracting increasing attention mainly because of the possibility to observe highly interesting many body phenomena such as interaction driven insulating states, ferromagnetism or even superconductivity. All this phenomena depend crucially on the twist angle between the individual graphene layers. Although the overall twist angle can be adjusted when assembling tBLG structures, it is known that the twist angle can vary over the sample and thus making the twist angle homogeneity a key parameter for device quality. In our work, we present spatially resolved confocal Raman spectroscopy measurements as a non-destructive and fast way to provide detailed information about the twist angle homogeneity in artificially made tBLG samples. In particular, we present detailed Raman maps on tBLG samples of 4°, 6° and 8° twist angle, allowing extracting information of the twist angle variation, with the long-term aim to improve this method so that it can be applied for twist angles from 1° to 12°. Moreover, we show some Raman measurements on graphene/hBN heterostructures with different twist angles.