Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials

O 64.5: Talk

Wednesday, March 19, 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