Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: 2D Materials beyond graphene: Growth, structure and substrate interaction (joint session O/HL/TT)
TT 16.2: Vortrag
Montag, 9. März 2026, 15:15–15:30, HSZ/0204
Magnetism of monolayers of FeCl2 and FeBr2 Epitaxially Grown on Bi2Se3 — •Sebastien E. Hadjadj1, Weibin Li2, Pierluigi Gargiani2, Cinthia Piamonteze3, Oleksandr Stetsovych4, Pavel Jelínek4, Maxim Ilyn1, and Celia Rogero1 — 1Materials Physics Center(MPC - CFM), Donostia, Spain — 2ALBA Synchrotron Light Source, Barcelona, Spain — 3Paul Scherrer Institut, Villigen, Switzerland — 4FZU - Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
Two-dimensional transition metal dihalides exhibit novel magnetic and electronic properties. By combining 2D magnetic semiconductors with topological insulators (TIs) novel quantum and spintronic phenomena can be investigated. Here, we report the uniform and epitaxial growth of monolayer FeCl2 and FeBr2 on the TI Bi2Se3. Structural and electronic characterization via LEED, STM, and STS measurements revealed a material-specific moiré pattern resulting from lattice mismatch, as well as a position-independent bandgap of 4 eV. Synchrotron-radiation-based XAS and XMCD measurements confirm robust ferromagnetic order down to the monolayer limit, with an intrinsic reduction of the effective spin magnetic moment by 40-50%. These magnetic vdW heterostructures provide a platform for investigating magnetic proximity effects and moiré-induced modifications of topological surface states. [1] S. E. Hadjadj et al., Chem. Mater., 35, 23, 9847*9856,(2023) [2] S. Kerschbaumer et al., Adv. Science, e08262,(2025)
Keywords: 2D magnets; Van der Waals heterostructure; XMCD; Topological insulator; STM