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HL: Fachverband Halbleiterphysik
HL 37: Focus Session: Physics of the van der Waals Magnetic Semiconductor CrSBr I (joint session HL/MA)
HL 37.1: Vortrag
Mittwoch, 19. März 2025, 15:00–15:15, H15
Doping-control of excitons and magnetism in few-layer CrSBr — •Farsane Tabataba-Vakili1,2,3, Anna Rupp2, Huy Nguyen2, Anvar Baimuratov2, and Alexander Högele2,3 — 1Institute of Condensed Matter Physics, Technische Universität Braunschweig, Braunschweig, Germany — 2Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, München, Germany — 3Munich Center for Quantum Science and Technology (MCQST), München, Germany
In two-dimensional (2D) magnets, phenomena distinct from bulk magnetism have been revealed, such as sensitivity to charge doping and electric field in few-layer CrI3. Within the class of 2D magnets, air-stable CrSBr stands out as an antiferromagnetic semiconductor with a high Néel temperature, excitons coupled to the magnetic order, and exciton-magnon coupling. In this talk, I will present our work on doping-control of excitons and magnetism in few-layer CrSBr [1]. We demonstrate that both exciton and magnetic transitions are sensitive to field-effect charging, exhibiting bound exciton-charge complexes and doping-induced metamagnetic transitions. We further visualize magnetic domain formation induced by magnetic field or charge-doping at the metamagnetic transition all-optically by raster-scan reflectance imaging. Our work identifies few-layer CrSBr as a rich platform for exploring collaborative effects of charge, optical excitations, and magnetism.
[1] F. Tabataba-Vakili et al., Nat. Commun. 15, 4735 (2024).
Keywords: 2D materials; 2D magnets; 2D semiconductors; CrSBr; exciton