Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Physics of the van der Waals Magnetic Semiconductor CrSBr II (joint session HL/MA)

HL 60.4: Invited Talk

Friday, March 21, 2025, 11:15–11:45, H17

Exciton and valley properties of monolayer transition metal dichalcogenides on the van der Waals magnetic semiconductor CrSBr — •Yara Galvao Gobato — Universidade Federal de Sao Carlos, Sao Carlos, Brazil

Chromium sulfide bromide is a promising van der Waals (vdW) magnetic material, undergoing a magnetic phase transition to an A type antiferromagnetic state below the Neél temperature of about 132K in its bulk form. VdW heterostructures composed of monolayer transition metal dichalcogenides (TMDs) and vdW magnetic materials such as CrSBr are an interesting platform to modify valley and excitonic properties of non-magnetic TMDs. In this talk, we will present our recent results on optical and magneto-optical properties of monolayer TMDs on CrSBr under different magnetic field orientations. Remarkably, we have observed a clear influence of the CrSBr magnetic order on the exciton and valley properties of monolayer TMDs, such as an anomalous linear polarization dependence, unsual temperature dependence of emission energies, magnetic field dependence of the emission intensity, and valley g-factor values with clear signatures of an asymmetric magnetic proximity exchange interaction. Our results are explained by asymmetric magnetic proximity effects, charge transfer and a possible contribution of exciton/trion magnon coupling. Our studies suggest that vdW heterostructures with antiferromagnetic nonmagnetic interfaces are interesting platforms to modify the valley and excitonic properties of TMDs for possible applications in opto-spintronics and quantum technology.

Keywords: magneto-optics; exciton; van der Waals heteroestrutures; TMDs; CrSBr