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Van der Waals heterostructures combining two-dimensional magnetic andsemiconducting layers constitute a promising platform for interfacingmagnetism, electronics, and optics. Here, we use resonant optical reflectionspectroscopy to the observe magnetic proximity effect in a gate-tunableMoSe$_2$/CrBr$_3$ heterostructure. High quality of the interface leads to agiant zero-field splitting of the K and K' valley excitons in MoSe$_2$,equivalent to an external magnetic field of 12 T, with a weak but distinctelectric field dependence that hints at potential for electrical control ofmagnetization. The magnetic proximity effect allows us to use resonant opticalspectroscopy to fully characterize the CrBr$_3$ magnet, determining theeasy-axis coercive field, the magnetic anisotropy energy, and criticalexponents associated with spin susceptibility and magnetization.

Observation of Magnetic Proximity Effect Using Resonant Optical Spectroscopy of an Electrically Tunable MoSe$_2$/CrBr$_3$ Heterostructure