We theoretically study spin and valley transport in a transition-metal dichalcogenide (TMDC)/ferromagnet heterostructure under a perpendicular magnetic field. We find that microwave-driven spin pumping induces a valley-selective spin excitation, a direct consequence of the valley-asymmetric Landau levels in the TMDC conduction band. This process generates a pure valley current, which, as our central finding, exhibits pronounced quantum oscillations as a function of chemical potential. These oscillations provide a definitive experimental signature of the quantized valley states and establish another pathway to interface spintronics and valleytronics.

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• Spin pumping
• Spintronics
• Valleytronics
• Transition metal dichalcogenides
• Nonequilibrium Green's function