Magnetic field brightening of interlayer excitons in twisted-WSe ₂

Abstract Moiré materials offer a versatile platform with engineered electronic structures, enabling the study of exotic quantum phenomena in strongly correlated and topological systems. From an optical perspective, the moiré pattern promotes the confinement of excitons giving rise to novel emissions depending on valleytronic, interlayer, and intralayer interactions. Here, we investigate the excitonic emissions of a twisted homobilayer WSe 2 that exhibits a moiré exciton with an intensity that depends on the application of a magnetic field perpendicular to the plane of the material. Our results suggest that the momentum mismatch Δ K , necessary to couple intralayer bright states from individual WSe 2 layers is promoted by magnetic field, giving rise to an interlayer excitonic emission with an intensity modulated by a magnetic field. This study opens new possibilities for manipulating the excitonic states of moiré materials, enabling the exploration of regimes characterized by smaller moiré pattern sizes and the dynamics involving interlayer and intralayer states.