Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials
O 64.5: Vortrag
Mittwoch, 19. März 2025, 17:00–17:15, H2
Monolayer Multiferroic - Superconductor van der Waals Heterostructures — •Büşra Gamze Arslan, Mohammad Amini, Ziying Wang, Robert Drost, and Peter Liljeroth — Department of Applied Physics, Aalto University, P.O. Box 15100, 00076 Aalto, Espoo, Finland
Topological superconductivity, a quantum phase hosting robust edge modes like Majorana zero modes (MZMs), holds promise for fault-tolerant quantum computation due to its stability against disturbances. Stacked van der Waals materials offer a promising platform to engineer topological superconductors, as they arise from the interactions between superconductors and magnetic materials. With its helical magnetic order and intrinsic spin-orbit coupling, multiferroic NiI2 is an excellent component for heterostructures realising topological superconductivity.
Here we present our study on monolayer NiI2 grown on superconducting bulk NbSe2. This system is characterized using scanning tunneling microscopy (STM) and spectroscopy (STS). The effect of doping due to the growth of NiI2 on different substrates is investigated. Our observations revealed that NiI2 does not show ferroelectricity, likely due to the charge transfer from the NbSe2 substrate. In addition, we have investigated the edges of the NiI2 islands, where we found clear signatures of edge modes in the NiI2/NbSe2 system. Whether these arise from topological effects remains to be seen in future studies. Our results show that combining 2D materials can create custom materials with relevant properties.
Keywords: multiferroicity; topological superconductivity; van der Waals heterostructures; STM