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DS: Fachverband Dünne Schichten
DS 2: 2D Materials and their Heterostructures I: hBN, WSe2, MoS2
DS 2.5: Vortrag
Montag, 18. März 2024, 10:30–10:45, A 060
Photo-induced charge and spin transfer in the heterostructure CrSBr/MoSe2 — •Andreas Beer1, C. Serati de Brito1,2, K. Zollner1, P. E. Feria Junior1, J. Fabian1, H. S. J. van der Zant3, Y. Galvao Gobato2, and C. Schüller1 — 1University of Regensburg — 2Universida de Federal de Sao Carlos — 3Delft University of Technology
Van der Waals (vdW) heterostructures composed of two-dimensional (2D) transition metal dichalcogenides (TMDC) and vdW magnetic materials offer an intriguing platform to functionalize valley and excitonic properties in non-magnetic TMDCs. Here, we report a two color pump probe investigation of monolayer (ML) MoSe2 on the layered A-type antiferromagnetic (AFM) semiconductor CrSBr. The material combination is predicted to feature a type III band alignment (broken bandgap), which leads to an p-doping in MoSe2. This can already be suspected by photoluminescence, white light mapping and magneto-PL measurements, but can ultimately be shown by a pump probe technique. An ultrafast pump pulse creates free electrons in CrSBr. They can tunnel to MoSe2 and reduce the background doping. The reduction can then be detected by an enhancement (reduction) in reflectivity of the MoSe2 exciton (Trion). Remarkably by pumping the heterostructure with circular polarized light we can observe a long-lasting Kerr effect in the heterostructure. We explain our results by an out of plane spin component in the first layer of CrSBr.
Keywords: ultrafast dynamics; optics; antiferromagnetic heterostructure; pump probe; Kerr