We study van der Waals heterostructures consisting of monolayer ${\mathrm{Mo}\mathrm{Se}}_2$ and few-layer ${\mathrm{Cr}}_2{\mathrm{Ge}}_2{\mathrm{Te}}_6$ fully encapsulated in hexagonal boron nitride using low-temperature photoluminescence and polar magneto-optical Kerr-effect measurements. Photoluminescence characterization reveals a partial quenching and a change of the exciton-trion emission ratio in the heterostructure as compared to the isolated ${\mathrm{Mo}\mathrm{Se}}_2$ monolayer. Under circularly polarized excitation, we find that the exciton-trion emission ratio depends on the relative orientation of excitation helicity and ${\mathrm{Cr}}_2{\mathrm{Ge}}_2{\mathrm{Te}}_6$ magnetization, even though the photoluminescence emission itself is unpolarized. This observation hints at an ultrafast, spin-dependent interlayer charge transfer that competes with exciton and trion formation and recombination.

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• Excitons
• Spin optoelectronics
• Spintronics
• Trions
• Valleytronics
• Magnetic semiconductors
• Transition metal dichalcogenides
• van der Waals systems