Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: 2D Materials: Stacking and Heterostructures (joint session O/HL)
O 88.3: Vortrag
Donnerstag, 20. März 2025, 15:30–15:45, H6
Topological magnetic Moiré heterostructures — •Aymeric Saunot1,3, Sebastien E. Hadjadj2, Tonica Valla1, Maxim Ilyn3, and Ilya I. Klimovskikh1 — 1Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastían, Basque Country, Spain. — 2Materials Physics Center (MPC), Paseo Manuel de Lardizabal N5,b20018 Donostia, Spain. — 3Departamento de Física de Materiales UPV/EHU, San Sebastían, Spain.
Over the last few years Moiré superlattices have become a hot topic in condensed matter, thanks to the experimental success of magic angle twisted graphene. Moiré superpotentials arise from either twist or atomic mismatch at the interface between van der Waals materials, leading to a rich physics of strongly correlated electrons. Intriguingly, creation of Moiré pattern on the surface of 3D topological insulator (TIs) is theoretically expected to lead to, among others, topological superconductivity, high Chern number systems and non-trivial magnetic textures. Here, we present Moiré heterostructures made from 3D TIs and novel 2D magnetic insulators transition metal dihalides. We investigate the heterostructure's surface by means of STM, ARPES, XMCD, and LEED. Our results show that the Moiré periodicity and the symmetry of the potential, can be tuned based on the ratio between the lattice parameters of the heterostructure's layers. Band structure measurements excitedly show the main Dirac cone surrounded by several Dirac cone replicas creating new Dirac minicones at the crossing points, opening a whole new platform to study topological Moiré physics.
Keywords: Moiré materials; 2D magnetic insulator; 3D topological insulator; ARPES; STM