Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Poster Wednesday: 2D Materials 2
O 54.6: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Subnanoscale Engineering of 2D Magnetism in van der Waals Heterostructures — •Keda Jin1,2, Jose Martinez-Castro1,2, Stefan F. Tautz1,3, and Markus Ternes1,2 — 1Institute of Physics II B, RWTH Aachen University, 52074 Aachen, Germany — 2Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich and Jülich- Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany — 3Institute of Physics IV A, RWTH Aachen University, 52074 Aachen, Germany
The dry transferred method paves a way to investigate exotic properties and emerging new phenomena in van der Waals heterostructures. Polycarbonate (PC) is commonly used as a polymer for the dry transfer of 2D materials. A limitation of PC is the contamination of chemical residues on the surface and the difficulty to fabricate complex heterostructures. Here, we show the study of different polymers, including polyvinyl chloride (PVC) and nitrocellulose for an effective and clean way to assemble 2D heterostructures. In addition, based on our previous method of studying encapsulated air-sensitive 2D materials (Nano Lett. 18, 6696 (2018)), we show our current development in a new technique to study air-sensitive materials in heterostructures compatible with ultra-high vacuum: in-situ de-encapsulation. This technique aims to provide the required cleanliness of mechanical assembled air-sensitive van der Waals heterostructures for their study by scanning tunneling microscopy at ultra-high vacuum and low temperature.